Winforms Static HandleCreated or OnLoad Event

Winforms Static HandleCreated or OnLoad Event - c#

Is there any static event that is triggered when a handle for a Winforms control is created or when it is loaded for the first time?
This is a contrived example:
using (Form f1 = new Form())
{
f1.HandleCreated += (sender, args) => { MessageBox.Show("hi"); };
f1.ShowDialog();
}
using (Form f2 = new Form())
{
f2.HandleCreated += (sender, args) => { MessageBox.Show("hi"); };
f2.ShowDialog();
}
And this is what I want:
Form.StaticHandleCreated += (sender, args) => { MessageBox.Show("hi"); };
using (Form f1 = new Form())
{
f1.ShowDialog();
}
using (Form f2 = new Form())
{
f2.ShowDialog();
}
(I want this because I have several hundred controls, and I need to customize the default behavior of a third party control, and the vendor does not provide a better way. They specifically say to handle the OnLoad event to do the customization, but this is a massive workload.)
Thanks to xtu, here is the working version that doesn't hold onto the forms longer than necessary, to avoid memory leaks.
public class WinFormMonitor : IDisposable
{
private readonly IntPtr _eventHook;
private List<Form> _detectedForms = new List<Form>();
public event Action<Form> NewFormDetected;
private WinEventDelegate _winEventDelegate;
public WinFormMonitor()
{
_winEventDelegate = WinEventProc;
_eventHook = SetWinEventHook(
EVENT_OBJECT_CREATE,
EVENT_OBJECT_CREATE,
IntPtr.Zero,
_winEventDelegate,
0,
0,
WINEVENT_OUTOFCONTEXT);
}
public void Dispose()
{
_detectedForms.Clear();
UnhookWinEvent(_eventHook);
}
private void WinEventProc(IntPtr hWinEventHook, uint eventType,
IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
{
if (idObject != 0 || idChild != 0) return;
var currentForms = Application.OpenForms.OfType<Form>().ToList();
var newForms = currentForms.Except(_detectedForms);
foreach (var f in newForms)
{
NewFormDetected?.Invoke(f);
}
_detectedForms = currentForms;
}
private const uint EVENT_OBJECT_CREATE = 0x8000;
private const uint WINEVENT_OUTOFCONTEXT = 0;
private delegate void WinEventDelegate(IntPtr hWinEventHook, uint eventType,
IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime);
[DllImport("user32.dll")]
private static extern IntPtr SetWinEventHook(uint eventMin, uint eventMax, IntPtr
hmodWinEventProc, WinEventDelegate lpfnWinEventProc, uint idProcess,
uint idThread, uint dwFlags);
[DllImport("user32.dll")]
private static extern bool UnhookWinEvent(IntPtr hWinEventHook);
}

I was inspired by this answer and used SetWinEventHook API to create a new WinForm monitor. Basically, it monitors the EVENT_OBJECT_CREATE event and fires an event whenever a new window is found.
The usage is very simple. You create a new instance and then attach a handler to the NewFormCreated event. Here is an example:
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
using (var monitor = new WinFormMonitor())
{
monitor.NewFormCreated += (sender, form) => { MessageBox.Show($"hi {form.Text}"); };
Application.Run(new Form1());
}
}
And here is the source of the WinFormMonitor:
public class WinFormMonitor : IDisposable
{
private readonly IntPtr _eventHook;
private readonly IList<int> _detectedFormHashes = new List<int>();
public event EventHandler<Form> NewFormCreated = (sender, form) => { };
public WinFormMonitor()
{
_eventHook = SetWinEventHook(
EVENT_OBJECT_CREATE,
EVENT_OBJECT_CREATE,
IntPtr.Zero,
WinEventProc,
0,
0,
WINEVENT_OUTOFCONTEXT);
}
public void Dispose()
{
_detectedFormHashes.Clear();
UnhookWinEvent(_eventHook);
}
private void WinEventProc(IntPtr hWinEventHook, uint eventType,
IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
{
// filter out non-HWND namechanges... (eg. items within a listbox)
if (idObject != 0 || idChild != 0) return;
if (!TryFindForm(hwnd, out var foundForm)) return;
RaiseIfNewFormFound(foundForm);
}
private void RaiseIfNewFormFound(Form foundForm)
{
var formHash = foundForm.GetHashCode();
if (_detectedFormHashes.Contains(formHash)) return;
NewFormCreated(this, foundForm);
_detectedFormHashes.Add(formHash);
}
private static bool TryFindForm(IntPtr handle, out Form foundForm)
{
foreach (Form openForm in Application.OpenForms)
{
if (openForm.Handle != handle) continue;
foundForm = openForm;
return true;
}
foundForm = null;
return false;
}
private const uint EVENT_OBJECT_CREATE = 0x8000;
private const uint WINEVENT_OUTOFCONTEXT = 0;
private delegate void WinEventDelegate(IntPtr hWinEventHook, uint eventType,
IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime);
[DllImport("user32.dll")]
private static extern IntPtr SetWinEventHook(uint eventMin, uint eventMax, IntPtr
hmodWinEventProc, WinEventDelegate lpfnWinEventProc, uint idProcess,
uint idThread, uint dwFlags);
[DllImport("user32.dll")]
private static extern bool UnhookWinEvent(IntPtr hWinEventHook);
}

Related

CallbackOnCollectedDelegate was detected (after some calls of Process.GetProcessByID by WinEventProc)

I need your guidance masters.
Bellow follow my code. I'm capturing the title of the window when the event 3 or 8 occur and creating a counter when the event 9 occur.
My code is working great, but, when I try to get the name of the owner of windows' exe with my function GetProcessName, I'm receiving the error "CallbackOnCollectedDelegate was detected". I already did and tried all I knowed, but nothing resolve the error. The error occur after some time of start the use of the application.
When I not call my function GetProcessName, the error not happen.
delegate void WinEventDelegate(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime);
[DllImport("user32.dll")]
static extern IntPtr SetWinEventHook(uint eventMin, uint eventMax, IntPtr hmodWinEventProc, WinEventDelegate lpfnWinEventProc, uint idProcess, uint idThread, uint dwFlags);
[DllImport("user32.dll")]
public static extern IntPtr GetWindowThreadProcessId(IntPtr hWnd, out uint ProcessId);
[DllImport("user32.dll")]
static extern IntPtr GetForegroundWindow();
private const uint EVENT_SYSTEM_FOREGROUND = 3;
private const uint EVENT_SYSTEM_CAPTUREEND = 9;
private const uint EVENT_SYSTEM_CAPTURESTART = 8;
int counter = 0;
public Form1()
{
InitializeComponent();
IntPtr handle = IntPtr.Zero;
SetWinEventHook(EVENT_SYSTEM_FOREGROUND, EVENT_SYSTEM_CAPTUREEND, IntPtr.Zero, new WinEventDelegate(WinEventProc), 0, 0, 0);
}
public void WinEventProc(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
{
try
{
if (eventType == EVENT_SYSTEM_FOREGROUND || eventType == EVENT_SYSTEM_CAPTURESTART && idObject == 0)
{
aux1 = GetActiveWindowTitle(hwnd);//A function tha get a name of the title of the window
if (aux1 != aux2 && string.IsNullOrEmpty(aux1) == false)
{
GetWindowThreadProcessId(hwnd, out pid);
pnomelast = GetProcessName((int)pid);//This is the function!!
aux2 = aux1;
aux1 = "";
}
}
else if (eventType == EVENT_SYSTEM_CAPTUREEND)
{
counter = counter + 1;
}
}
catch (Exception e)
{
};
}
public static string GetProcessName(int processId)
{
try
{
return Process.GetProcessById(processId).MainModule.FileName.ToString().Split('\\').Last();
}
catch (Exception)
{
return "";
}
}
Thanks a lot.

Your issue is that SetWinEventHook is creating a new delegate on the fly which has no reference. Since it is orphaned, it will be destroyed on the next garbage collection.
First create a new WinEventDelegate
private static winEventDelegate = new WinEventDelegate(WinEventProc);
Then change:
SetWinEventHook(EVENT_SYSTEM_FOREGROUND, EVENT_SYSTEM_CAPTUREEND, IntPtr.Zero, new WinEventDelegate(WinEventProc), 0, 0, 0);
TO:
SetWinEventHook(EVENT_SYSTEM_FOREGROUND, EVENT_SYSTEM_CAPTUREEND, IntPtr.Zero, winEventDelegate, 0, 0, 0);

I made a complete and compact version of the code, that represents the problem, the error happen when the Process.GetProcessById is called. Thanks.
namespace stackoverflow1 {
public partial class Form1 : Form {
delegate void WinEventDelegate(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime);
[DllImport("user32.dll")]
static extern IntPtr SetWinEventHook(uint eventMin, uint eventMax, IntPtr hmodWinEventProc, WinEventDelegate lpfnWinEventProc, uint idProcess, uint idThread, uint dwFlags);
[DllImport("user32.dll")]
public static extern IntPtr GetWindowThreadProcessId(IntPtr hWnd, out uint ProcessId);
[DllImport("user32.dll")]
static extern IntPtr GetForegroundWindow();
private const uint EVENT_SYSTEM_FOREGROUND = 3;
private const uint EVENT_SYSTEM_CAPTURESTART = 8;
uint pid = 0;
string pnamelast = "";
public Form1()
{
InitializeComponent();
WinEventDelegate dele = new WinEventDelegate(WinEventProc);
SetWinEventHook(EVENT_SYSTEM_FOREGROUND, EVENT_SYSTEM_CAPTURESTART, IntPtr.Zero, dele, 0, 0, 0);
}
private void Form1_Load(object sender, EventArgs e)
{
}
public void WinEventProc(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
{
try
{
if (eventType == EVENT_SYSTEM_FOREGROUND || eventType == EVENT_SYSTEM_CAPTURESTART && idObject == 0)
{
GetWindowThreadProcessId(hwnd, out pid);
pnamelast = Process.GetProcessById((int)pid).MainModule.FileName.ToString().Split('\\').Last();
textBox1.AppendText(pnamelast + "\r\n");
}
}
catch
{
}
}
}
}

Move window when external application's window moves

I've got an always on-top application (basically a status display) that I want to follow around another program and always sit just to the left of the minimize button.
I can get the Rect representing the "target" process using the following code which I can then pair with an offset to generate the initial position of my overlay.
Get the HWnd IntPtr:
private IntPtr HWnd = Process.GetProcessesByName("targetapplication")[0].MainWindowHandle;
Declare the function from user32.dll:
[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool GetWindowRect(IntPtr hWnd, ref RECT lpRect);
And the appropriate struct:
[StructLayout(LayoutKind.Sequential)]
private struct RECT
{
public int Left;
public int Top;
public int Right;
public int Bottom;
}
And then call it on demand.
However, I would like to avoid constantly polling this value, so I would like to hook into the target application and respond whenever the target window is moved.
Looking around the user32.dll documentation, the only way I can see for doing this is using SetWindowsHookEx(). I'm not entirely sure of how I'd go about intercepting an event from here however.
I believe the target application is built off of WinForms but I cannot be sure. So solutions that let me respond to the target's Move event or directly to some Windows Message would both be useful.
Any ideas on how I can proceed?

A method to hook a Windows Form to another process (Notepad, in this case) and follow the movements of the process' Main Window, to create sort of a Toolbar that can interact with the process, using SetWinEventHook().
To get the hooked Window bounds, GetWindowRect() is not recommended. Better call DwmGetWindowAttribute() passing DWMWA_EXTENDED_FRAME_BOUNDS as the DWMWINDOWATTRIBUTE, which still returns a RECT. This because GetWindowRect() is not DpiAware and it may return a virtualized measure in some contexts, plus it includes the Window drop shadow in specific configurations.
Read more about DpiAwarenes, Screen layout and VirtualScreen here:
Using SetWindowPos with multiple monitors
Also refactored the Hook helper class and the NativeMethods declarations.
▶ To move to foreground the Tool Window, as in the animation, when the hooked Window becomes the Foreground Window, also hook the EVENT_SYSTEM_FOREGROUND event: you'll receive a notification when the Foreground Window changes, then compare with the handle of Window you're hooking.
A visual representation of the results:
The Form class initialization procedure:
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Windows.Forms;
public partial class Form1 : Form
{
private IntPtr notepadhWnd;
private IntPtr hWinEventHook;
private Process targetProc = null;
protected Hook.WinEventDelegate WinEventDelegate;
static GCHandle GCSafetyHandle;
public Form1()
{
InitializeComponent();
WinEventDelegate = new Hook.WinEventDelegate(WinEventCallback);
GCSafetyHandle = GCHandle.Alloc(WinEventDelegate);
targetProc = Process.GetProcessesByName("notepad").FirstOrDefault(p => p != null);
try {
if (targetProc != null) {
notepadhWnd = targetProc.MainWindowHandle;
if (notepadhWnd != IntPtr.Zero) {
uint targetThreadId = Hook.GetWindowThread(notepadhWnd);
hWinEventHook = Hook.WinEventHookOne(
NativeMethods.SWEH_Events.EVENT_OBJECT_LOCATIONCHANGE,
WinEventDelegate, (uint)targetProc.Id, targetThreadId);
var rect = Hook.GetWindowRectangle(notepadhWnd);
// Of course, set the Form.StartPosition to Manual
Location = new Point(rect.Right, rect.Top);
}
}
}
catch (Exception ex) {
// Log and message or
throw;
}
}
protected void WinEventCallback(
IntPtr hWinEventHook,
NativeMethods.SWEH_Events eventType,
IntPtr hWnd,
NativeMethods.SWEH_ObjectId idObject,
long idChild, uint dwEventThread, uint dwmsEventTime)
{
if (hWnd == notepadhWnd &&
eventType == NativeMethods.SWEH_Events.EVENT_OBJECT_LOCATIONCHANGE &&
idObject == (NativeMethods.SWEH_ObjectId)NativeMethods.SWEH_CHILDID_SELF)
{
var rect = Hook.GetWindowRectangle(hWnd);
Location = new Point(rect.Right, rect.Top);
}
}
protected override void OnFormClosing(FormClosingEventArgs e)
{
base.OnFormClosing(e);
if (!e.Cancel) {
if (GCSafetyHandle.IsAllocated) GCSafetyHandle.Free();
Hook.WinEventUnhook(hWinEventHook);
}
}
protected override void OnShown(EventArgs e)
{
if (targetProc == null) {
this.Hide();
MessageBox.Show("Notepad not found!", "Target Missing", MessageBoxButtons.OK, MessageBoxIcon.Hand);
this.Close();
}
else {
Size = new Size(50, 140);
targetProc.Dispose();
}
base.OnShown(e);
}
The support classes used to reference the Windows API methods:
using System.Runtime.InteropServices;
using System.Security.Permissions;
public class Hook
{
public delegate void WinEventDelegate(
IntPtr hWinEventHook,
NativeMethods.SWEH_Events eventType,
IntPtr hwnd,
NativeMethods.SWEH_ObjectId idObject,
long idChild,
uint dwEventThread,
uint dwmsEventTime
);
public static IntPtr WinEventHookRange(
NativeMethods.SWEH_Events eventFrom, NativeMethods.SWEH_Events eventTo,
WinEventDelegate eventDelegate,
uint idProcess, uint idThread)
{
return NativeMethods.SetWinEventHook(
eventFrom, eventTo,
IntPtr.Zero, eventDelegate,
idProcess, idThread,
NativeMethods.WinEventHookInternalFlags);
}
public static IntPtr WinEventHookOne(
NativeMethods.SWEH_Events eventId,
WinEventDelegate eventDelegate,
uint idProcess,
uint idThread)
{
return NativeMethods.SetWinEventHook(
eventId, eventId,
IntPtr.Zero, eventDelegate,
idProcess, idThread,
NativeMethods.WinEventHookInternalFlags);
}
public static bool WinEventUnhook(IntPtr hWinEventHook) =>
NativeMethods.UnhookWinEvent(hWinEventHook);
public static uint GetWindowThread(IntPtr hWnd)
{
return NativeMethods.GetWindowThreadProcessId(hWnd, IntPtr.Zero);
}
public static NativeMethods.RECT GetWindowRectangle(IntPtr hWnd)
{
NativeMethods.DwmGetWindowAttribute(hWnd,
NativeMethods.DWMWINDOWATTRIBUTE.DWMWA_EXTENDED_FRAME_BOUNDS,
out NativeMethods.RECT rect, Marshal.SizeOf<NativeMethods.RECT>());
return rect;
}
}
public static class NativeMethods
{
[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
public int Left;
public int Top;
public int Right;
public int Bottom;
public Rectangle ToRectangle() => Rectangle.FromLTRB(Left, Top, Right, Bottom);
}
public static long SWEH_CHILDID_SELF = 0;
//SetWinEventHook() flags
public enum SWEH_dwFlags : uint
{
WINEVENT_OUTOFCONTEXT = 0x0000, // Events are ASYNC
WINEVENT_SKIPOWNTHREAD = 0x0001, // Don't call back for events on installer's thread
WINEVENT_SKIPOWNPROCESS = 0x0002, // Don't call back for events on installer's process
WINEVENT_INCONTEXT = 0x0004 // Events are SYNC, this causes your dll to be injected into every process
}
//SetWinEventHook() events
public enum SWEH_Events : uint
{
EVENT_MIN = 0x00000001,
EVENT_MAX = 0x7FFFFFFF,
EVENT_SYSTEM_SOUND = 0x0001,
EVENT_SYSTEM_ALERT = 0x0002,
EVENT_SYSTEM_FOREGROUND = 0x0003,
EVENT_SYSTEM_MENUSTART = 0x0004,
EVENT_SYSTEM_MENUEND = 0x0005,
EVENT_SYSTEM_MENUPOPUPSTART = 0x0006,
EVENT_SYSTEM_MENUPOPUPEND = 0x0007,
EVENT_SYSTEM_CAPTURESTART = 0x0008,
EVENT_SYSTEM_CAPTUREEND = 0x0009,
EVENT_SYSTEM_MOVESIZESTART = 0x000A,
EVENT_SYSTEM_MOVESIZEEND = 0x000B,
EVENT_SYSTEM_CONTEXTHELPSTART = 0x000C,
EVENT_SYSTEM_CONTEXTHELPEND = 0x000D,
EVENT_SYSTEM_DRAGDROPSTART = 0x000E,
EVENT_SYSTEM_DRAGDROPEND = 0x000F,
EVENT_SYSTEM_DIALOGSTART = 0x0010,
EVENT_SYSTEM_DIALOGEND = 0x0011,
EVENT_SYSTEM_SCROLLINGSTART = 0x0012,
EVENT_SYSTEM_SCROLLINGEND = 0x0013,
EVENT_SYSTEM_SWITCHSTART = 0x0014,
EVENT_SYSTEM_SWITCHEND = 0x0015,
EVENT_SYSTEM_MINIMIZESTART = 0x0016,
EVENT_SYSTEM_MINIMIZEEND = 0x0017,
EVENT_SYSTEM_DESKTOPSWITCH = 0x0020,
EVENT_SYSTEM_END = 0x00FF,
EVENT_OEM_DEFINED_START = 0x0101,
EVENT_OEM_DEFINED_END = 0x01FF,
EVENT_UIA_EVENTID_START = 0x4E00,
EVENT_UIA_EVENTID_END = 0x4EFF,
EVENT_UIA_PROPID_START = 0x7500,
EVENT_UIA_PROPID_END = 0x75FF,
EVENT_CONSOLE_CARET = 0x4001,
EVENT_CONSOLE_UPDATE_REGION = 0x4002,
EVENT_CONSOLE_UPDATE_SIMPLE = 0x4003,
EVENT_CONSOLE_UPDATE_SCROLL = 0x4004,
EVENT_CONSOLE_LAYOUT = 0x4005,
EVENT_CONSOLE_START_APPLICATION = 0x4006,
EVENT_CONSOLE_END_APPLICATION = 0x4007,
EVENT_CONSOLE_END = 0x40FF,
EVENT_OBJECT_CREATE = 0x8000, // hwnd ID idChild is created item
EVENT_OBJECT_DESTROY = 0x8001, // hwnd ID idChild is destroyed item
EVENT_OBJECT_SHOW = 0x8002, // hwnd ID idChild is shown item
EVENT_OBJECT_HIDE = 0x8003, // hwnd ID idChild is hidden item
EVENT_OBJECT_REORDER = 0x8004, // hwnd ID idChild is parent of zordering children
EVENT_OBJECT_FOCUS = 0x8005, // hwnd ID idChild is focused item
EVENT_OBJECT_SELECTION = 0x8006, // hwnd ID idChild is selected item (if only one), or idChild is OBJID_WINDOW if complex
EVENT_OBJECT_SELECTIONADD = 0x8007, // hwnd ID idChild is item added
EVENT_OBJECT_SELECTIONREMOVE = 0x8008, // hwnd ID idChild is item removed
EVENT_OBJECT_SELECTIONWITHIN = 0x8009, // hwnd ID idChild is parent of changed selected items
EVENT_OBJECT_STATECHANGE = 0x800A, // hwnd ID idChild is item w/ state change
EVENT_OBJECT_LOCATIONCHANGE = 0x800B, // hwnd ID idChild is moved/sized item
EVENT_OBJECT_NAMECHANGE = 0x800C, // hwnd ID idChild is item w/ name change
EVENT_OBJECT_DESCRIPTIONCHANGE = 0x800D, // hwnd ID idChild is item w/ desc change
EVENT_OBJECT_VALUECHANGE = 0x800E, // hwnd ID idChild is item w/ value change
EVENT_OBJECT_PARENTCHANGE = 0x800F, // hwnd ID idChild is item w/ new parent
EVENT_OBJECT_HELPCHANGE = 0x8010, // hwnd ID idChild is item w/ help change
EVENT_OBJECT_DEFACTIONCHANGE = 0x8011, // hwnd ID idChild is item w/ def action change
EVENT_OBJECT_ACCELERATORCHANGE = 0x8012, // hwnd ID idChild is item w/ keybd accel change
EVENT_OBJECT_INVOKED = 0x8013, // hwnd ID idChild is item invoked
EVENT_OBJECT_TEXTSELECTIONCHANGED = 0x8014, // hwnd ID idChild is item w? test selection change
EVENT_OBJECT_CONTENTSCROLLED = 0x8015,
EVENT_SYSTEM_ARRANGMENTPREVIEW = 0x8016,
EVENT_OBJECT_END = 0x80FF,
EVENT_AIA_START = 0xA000,
EVENT_AIA_END = 0xAFFF
}
//SetWinEventHook() Object Ids
public enum SWEH_ObjectId : long
{
OBJID_WINDOW = 0x00000000,
OBJID_SYSMENU = 0xFFFFFFFF,
OBJID_TITLEBAR = 0xFFFFFFFE,
OBJID_MENU = 0xFFFFFFFD,
OBJID_CLIENT = 0xFFFFFFFC,
OBJID_VSCROLL = 0xFFFFFFFB,
OBJID_HSCROLL = 0xFFFFFFFA,
OBJID_SIZEGRIP = 0xFFFFFFF9,
OBJID_CARET = 0xFFFFFFF8,
OBJID_CURSOR = 0xFFFFFFF7,
OBJID_ALERT = 0xFFFFFFF6,
OBJID_SOUND = 0xFFFFFFF5,
OBJID_QUERYCLASSNAMEIDX = 0xFFFFFFF4,
OBJID_NATIVEOM = 0xFFFFFFF0
}
public enum DWMWINDOWATTRIBUTE : uint
{
DWMWA_NCRENDERING_ENABLED = 1, // [get] Is non-client rendering enabled/disabled
DWMWA_NCRENDERING_POLICY, // [set] DWMNCRENDERINGPOLICY - Non-client rendering policy - Enable or disable non-client rendering
DWMWA_TRANSITIONS_FORCEDISABLED, // [set] Potentially enable/forcibly disable transitions
DWMWA_ALLOW_NCPAINT, // [set] Allow contents rendered In the non-client area To be visible On the DWM-drawn frame.
DWMWA_CAPTION_BUTTON_BOUNDS, // [get] Bounds Of the caption button area In window-relative space.
DWMWA_NONCLIENT_RTL_LAYOUT, // [set] Is non-client content RTL mirrored
DWMWA_FORCE_ICONIC_REPRESENTATION, // [set] Force this window To display iconic thumbnails.
DWMWA_FLIP3D_POLICY, // [set] Designates how Flip3D will treat the window.
DWMWA_EXTENDED_FRAME_BOUNDS, // [get] Gets the extended frame bounds rectangle In screen space
DWMWA_HAS_ICONIC_BITMAP, // [set] Indicates an available bitmap When there Is no better thumbnail representation.
DWMWA_DISALLOW_PEEK, // [set] Don't invoke Peek on the window.
DWMWA_EXCLUDED_FROM_PEEK, // [set] LivePreview exclusion information
DWMWA_CLOAK, // [set] Cloak Or uncloak the window
DWMWA_CLOAKED, // [get] Gets the cloaked state Of the window. Returns a DWMCLOACKEDREASON object
DWMWA_FREEZE_REPRESENTATION, // [set] BOOL, Force this window To freeze the thumbnail without live update
PlaceHolder1,
PlaceHolder2,
PlaceHolder3,
DWMWA_ACCENTPOLICY = 19
}
public static SWEH_dwFlags WinEventHookInternalFlags =
SWEH_dwFlags.WINEVENT_OUTOFCONTEXT |
SWEH_dwFlags.WINEVENT_SKIPOWNPROCESS |
SWEH_dwFlags.WINEVENT_SKIPOWNTHREAD;
[DllImport("dwmapi.dll", SetLastError = true)]
internal static extern int DwmGetWindowAttribute(IntPtr hwnd, DWMWINDOWATTRIBUTE dwAttribute, out RECT pvAttribute, int cbAttribute);
[DllImport("user32.dll", SetLastError = true)]
internal static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);
[DllImport("user32.dll")]
internal static extern uint GetWindowThreadProcessId(IntPtr hWnd, IntPtr voidProcessId);
[DllImport("user32.dll", SetLastError = false)]
internal static extern IntPtr SetWinEventHook(
SWEH_Events eventMin,
SWEH_Events eventMax,
IntPtr hmodWinEventProc,
Hook.WinEventDelegate lpfnWinEventProc,
uint idProcess, uint idThread,
SWEH_dwFlags dwFlags);
[DllImport("user32.dll", SetLastError = false)]
internal static extern bool UnhookWinEvent(IntPtr hWinEventHook);
}

Thanks to #Jimi for his help here. The following method worked.
First, store a reference to the target process:
Process _target = Process.GetProcessesByName("target")[0];
Then get the handle to the main window:
IntPtr _tagetHWnd = _target.MainWindowHandle;
Then initialise the hook:
SetWinEventHook(EVENT_OBJECT_LOCATIONCHANGE, EVENT_OBJECT_LOCATIONCHANGE, IntPtr.Zero, TargetMoved, (uint)_foxview.Id,
GetWindowThreadProcessId(_foxview.MainWindowHandle, IntPtr.Zero), WINEVENT_OUTOFCONTEXT | WINEVENT_SKIPOWNPROCESS | WINEVENT_SKIPOWNTHREAD);
Where SetWinEventHook is declared as such:
[DllImport("user32.dll")]
private static extern IntPtr SetWinEventHook(uint eventMin, uint eventMax, IntPtr hmodWinEventProc, WinEventDelegate lpfnWinEventProc, uint idProcess, uint idThread, uint dwFlags);
And the constants involved are:
private const uint EVENT_OBJECT_LOCATIONCHANGE = 0x800B;
private const int HT_CAPTION = 0x2;
private const uint WINEVENT_OUTOFCONTEXT = 0x0000;
private const uint WINEVENT_SKIPOWNPROCESS = 0x0002;
private const uint WINEVENT_SKIPOWNTHREAD = 0x0001;
private const int WM_NCLBUTTONDOWN = 0xA1;
Then in my TargetMoved method I get check the new Window location and move my overlay.
private void TargetMoved(IntPtr hWinEventHook, uint eventType, IntPtr lParam, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
{
Rect newLocation = new Rect();
GetWindowRect(_foxViewHWnd, ref newLocation);
Location = new Point(newLocation.Right - (250 + _currentUser.Length * 7), newLocation.Top + 5);
}
Where GetWindowRect() is defined by:
[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool GetWindowRect(IntPtr hWnd, ref Rect lpRect);
And Rect is defined by:
[StructLayout(LayoutKind.Sequential)]
private struct Rect
{
public readonly int Left;
public readonly int Top;
public readonly int Right;
public readonly int Bottom;
}
So when you put it all together, the entire class now looks like this:
using System;
using System.Diagnostics;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using UserMonitor;
namespace OnScreenOverlay
{
public partial class Overlay : Form
{
#region Public Fields
public const string UserCache = #"redacted";
#endregion Public Fields
#region Private Fields
private const uint EVENT_OBJECT_LOCATIONCHANGE = 0x800B;
private const uint WINEVENT_OUTOFCONTEXT = 0x0000;
private const uint WINEVENT_SKIPOWNPROCESS = 0x0002;
private const uint WINEVENT_SKIPOWNTHREAD = 0x0001;
private readonly Process _foxview;
private readonly IntPtr _foxViewHWnd;
private readonly UserMon _monitor;
private string _currentUser;
#endregion Private Fields
#region Public Constructors
public Overlay()
{
InitializeComponent();
_target= Process.GetProcessesByName("target")[0];
if (_foxview == null)
{
MessageBox.Show("No target detected... Closing");
Close();
}
_targetHWnd = _target.MainWindowHandle;
InitializeWinHook();
StartPosition = FormStartPosition.Manual;
Location = new Point(Screen.PrimaryScreen.Bounds.Left + 20, Screen.PrimaryScreen.Bounds.Bottom - 20);
ShowInTaskbar = false;
_monitor = new UserMon(UserCache);
_monitor.UserChanged += (s, a) =>
{
_currentUser = a.Value;
if (pictBox.InvokeRequired)
{
pictBox.Invoke((MethodInvoker)delegate { pictBox.Refresh(); });
}
};
_currentUser = _monitor.GetUser();
}
#endregion Public Constructors
#region Private Delegates
private delegate void WinEventDelegate(IntPtr hWinEventHook, uint eventType,
IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime);
#endregion Private Delegates
#region Private Methods
[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool GetWindowRect(IntPtr hWnd, ref Rect lpRect);
[DllImport("user32.dll", SetLastError = true)]
private static extern uint GetWindowThreadProcessId(IntPtr hWnd, IntPtr processId);
[DllImport("user32.dll")]
private static extern IntPtr SetWinEventHook(uint eventMin, uint eventMax, IntPtr
hmodWinEventProc, WinEventDelegate lpfnWinEventProc, uint idProcess,
uint idThread, uint dwFlags);
private void InitializeWinHook()
{
SetWinEventHook(EVENT_OBJECT_LOCATIONCHANGE, EVENT_OBJECT_LOCATIONCHANGE, IntPtr.Zero, TargetMoved, (uint)_foxview.Id,
GetWindowThreadProcessId(_foxview.MainWindowHandle, IntPtr.Zero), WINEVENT_OUTOFCONTEXT | WINEVENT_SKIPOWNPROCESS | WINEVENT_SKIPOWNTHREAD);
}
private void Overlay_FormClosing(object sender, FormClosingEventArgs e)
{
_monitor.Dispose();
}
private void pictBox_Paint(object sender, PaintEventArgs e)
{
using (Font myFont = new Font("Arial", 8))
{
e.Graphics.DrawString($"User: {_currentUser}", myFont, Brushes.LimeGreen, new Point(2, 2));
}
}
private void TargetMoved(IntPtr hWinEventHook, uint eventType, IntPtr lParam, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
{
Rect newLocation = new Rect();
GetWindowRect(_foxViewHWnd, ref newLocation);
Location = new Point(newLocation.Right - (250 + _currentUser.Length * 7), newLocation.Top + 5);
}
#endregion Private Methods
#region Private Structs
[StructLayout(LayoutKind.Sequential)]
private struct Rect
{
public readonly int Left;
public readonly int Top;
public readonly int Right;
public readonly int Bottom;
}
#endregion Private Structs
}
}

Hook minimize event of third party application

I have following hook class:
public sealed class Hook : IDisposable
{
public delegate void Win32Event(IntPtr hWnd);
#region Windows API
private const uint WINEVENT_OUTOFCONTEXT = 0x0000;
[DllImport("User32.dll", SetLastError = true)]
private static extern IntPtr SetWinEventHook(
uint eventMin,
uint eventMax,
IntPtr hmodWinEventProc,
WinEventDelegate lpfnWinEventProc,
uint idProcess,
uint idThread,
uint dwFlags);
[DllImport("user32.dll")]
private static extern bool UnhookWinEvent(
IntPtr hWinEventHook
);
private enum SystemEvents : uint
{
EVENT_OBJECT_CREATE = 0x8000,
EVENT_OBJECT_DESTROY = 0x8001,
EVENT_SYSTEM_MINIMIZESTART = 0x0016,
EVENT_SYSTEM_MINIMIZEEND = 0x0017,
EVENT_SYSTEM_FOREGROUND = 0x0003
}
private delegate void WinEventDelegate(
IntPtr hWinEventHook,
uint eventType,
IntPtr hWnd,
int idObject,
int idChild,
uint dwEventThread,
uint dwmsEventTime);
#endregion
public Win32Event OnWindowCreate = delegate { };
public Win32Event OnWindowDestroy = delegate { };
public Win32Event OnWindowForegroundChanged = delegate { };
public Win32Event OnWindowMinimizeEnd = delegate { };
public Win32Event OnWindowMinimizeStart = delegate { };
private IntPtr pHook;
private bool _disposed;
public Hook(IntPtr hWnd)
{
pHook = SetWinEventHook((uint) SystemEvents.EVENT_SYSTEM_FOREGROUND,
(uint) SystemEvents.EVENT_OBJECT_DESTROY,
hWnd,
WinEvent,
0,
0,
WINEVENT_OUTOFCONTEXT
);
if (IntPtr.Zero.Equals(pHook))
throw new Win32Exception();
}
public void Dispose()
{
Dispose(true);
}
private void WinEvent(IntPtr hWinEventHook, uint eventType, IntPtr hWnd, int idObject, int idChild,
uint dwEventThread, uint dwmsEventTime)
{
switch ((SystemEvents) eventType)
{
case SystemEvents.EVENT_OBJECT_DESTROY:
OnWindowDestroy(hWnd);
break;
case SystemEvents.EVENT_SYSTEM_FOREGROUND:
OnWindowForegroundChanged(hWnd);
break;
case SystemEvents.EVENT_SYSTEM_MINIMIZESTART:
OnWindowMinimizeStart(hWnd);
break;
case SystemEvents.EVENT_SYSTEM_MINIMIZEEND:
OnWindowMinimizeEnd(hWnd);
break;
case SystemEvents.EVENT_OBJECT_CREATE:
OnWindowCreate(hWnd);
break;
}
}
~Hook()
{
Dispose(false);
}
private void Dispose(bool manual)
{
if (_disposed)
return;
if (!IntPtr.Zero.Equals(pHook))
UnhookWinEvent(pHook);
pHook = IntPtr.Zero;
OnWindowCreate = null;
OnWindowDestroy = null;
OnWindowForegroundChanged = null;
OnWindowMinimizeStart = null;
OnWindowMinimizeEnd = null;
_disposed = true;
if (manual)
{
GC.SuppressFinalize(this);
}
}
}
But when I use it nothing happens:
class Program
{
static void Main(string[] args)
{
var process = Process.GetProcessesByName("Notepad")[0];
var hook = new Hook(process.MainWindowHandle);
hook.OnWindowMinimizeStart += wnd => Console.WriteLine("Minimized at {0}", DateTime.Now.ToShortTimeString());
Console.WriteLine("Press any key to exit");
Console.ReadKey();
}
}
what am I doing wrong here? It seems that everything is OK.

c# global system hook to detect change of active window

I have been using the following code to detect a change of active window with C# but on the odd occasion it simply doesn't register the change of an active window when it definitely occurs. In most instances it works absolutely fine. I've had a look into it but it seems to me that the only thing I can do is turn to C++ to get a reliable solution but before doing that I thought I would ask the question of the code below.
GlobalEventHook.Start();
GlobalEventHook.WinEventActive += new EventHandler(GlobalEventHook_WinEventActive); //set up the global hook events
private void GlobalEventHook_WinEventActive(object sender, EventArgs e)
{
// do whatever
}
using System;
using System.Collections;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
namespace Pro
{
public static class GlobalEventHook
{
[DllImport("user32.dll")]
internal static extern IntPtr SetWinEventHook(uint eventMin, uint eventMax, IntPtr hmodWinEventProc,
WinEventDelegate lpfnWinEventProc, uint idProcess, uint idThread, uint dwFlags);
[DllImport("user32.dll")]
internal static extern bool UnhookWinEvent(IntPtr hWinEventHook);
public static event EventHandler WinEventActive = delegate { };
public static event EventHandler WinEventContentScrolled = delegate { };
public delegate void WinEventDelegate(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject,
int idChild, uint dwEventThread, uint dwmsEventTime);
private static WinEventDelegate dele = null;
private static IntPtr _hookID = IntPtr.Zero;
public static void Start()
{
dele = new WinEventDelegate(WinEventProc);
_hookID = SetWinEventHook(Win32API.EVENT_SYSTEM_FOREGROUND, Win32API.EVENT_SYSTEM_FOREGROUND, IntPtr.Zero, dele, 0, 0, Win32API.WINEVENT_OUTOFCONTEXT);
}
public static void stop()
{
UnhookWinEvent(_hookID);
}
public static void restart()
{
_hookID = SetWinEventHook(Win32API.EVENT_SYSTEM_FOREGROUND, Win32API.EVENT_SYSTEM_FOREGROUND, IntPtr.Zero, dele, 0, 0, Win32API.WINEVENT_OUTOFCONTEXT);
}
public static void WinEventProc(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
{
try
{
if (eventType == Win32API.EVENT_SYSTEM_FOREGROUND)
{
if (hwnd == Win32API.GetForegroundWindow())
{
WinEventActive(null, new EventArgs());
}
}
}
catch (Exception exc)
{
}
}

How to get processes from mouse event using Intptr (USER32.dll) ???

I have a problem in last two days i want to get processes of users which he clicked. like if a user clicks Notepad my program should tell me that user clicked Notepad. Notepad is opened. And if user clicks Calculator my program also tell that user clicked Calculator. Calcultor process is runing.
For this purpose i used this code. Hook manager which gives me mouse click events but not giving me the process.
I am only getting mouse intptr event.
private static void WindowEventCallback(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
{
Console.WriteLine("Event {0}", hwnd);// it is giving me mouse event
/*uint pid;
GetWindowThreadProcessId(hwnd, out pid);// it gives me process id
Process p = Process.GetProcessById((int)pid);// now here exception occured not in vs studio but when i run its exe then its gives me access violation exception
if (!my.ContainsKey(p.MainWindowTitle.ToString()))
{
my.Add(p.MainWindowTitle.ToString(), p.Id.ToString());
Console.WriteLine("\r\n");
Console.WriteLine("Status = Running");
Console.WriteLine("\r\n Window Title:" + p.MainWindowTitle.ToString());
Console.WriteLine("\r\n Process Name:" + p.ProcessName.ToString());
Console.WriteLine("\r\n Process Starting Time:" + p.StartTime.ToString());
}*/
}
the full code is
static void Main(string[] args)
{
HookManager.SubscribeToWindowEvents();
EventLoop.Run();
}
public static class HookManager
{
[DllImport("user32.dll")]
public static extern IntPtr GetWindowThreadProcessId(IntPtr hWnd, out uint ProcessId);
public static void SubscribeToWindowEvents()
{
if (windowEventHook == IntPtr.Zero)
{
windowEventHook = SetWinEventHook(
EVENT_SYSTEM_FOREGROUND, // eventMin
EVENT_SYSTEM_FOREGROUND, // eventMax
IntPtr.Zero, // hmodWinEventProc
WindowEventCallback, // lpfnWinEventProc
0, // idProcess
0, // idThread
WINEVENT_OUTOFCONTEXT | WINEVENT_SKIPOWNPROCESS);
if (windowEventHook == IntPtr.Zero)
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
}
static Dictionary<string, string> my = new Dictionary<string, string>();
private static void WindowEventCallback(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
{
Console.WriteLine("Event {0}", hwnd);
/*uint pid;
GetWindowThreadProcessId(hwnd, out pid);
Process p = Process.GetProcessById((int)pid);
if (!my.ContainsKey(p.MainWindowTitle.ToString()))
{
my.Add(p.MainWindowTitle.ToString(), p.Id.ToString());
Console.WriteLine("\r\n");
Console.WriteLine("Status = Running");
Console.WriteLine("\r\n Window Title:" + p.MainWindowTitle.ToString());
Console.WriteLine("\r\n Process Name:" + p.ProcessName.ToString());
Console.WriteLine("\r\n Process Starting Time:" + p.StartTime.ToString());
}*/
}
}
private static IntPtr windowEventHook;
private delegate void WinEventProc(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime);
[DllImport("user32.dll", SetLastError = true)]
private static extern IntPtr SetWinEventHook(int eventMin, int eventMax, IntPtr hmodWinEventProc, WinEventProc lpfnWinEventProc, int idProcess, int idThread, int dwflags);
[DllImport("user32.dll", SetLastError = true)]
private static extern int UnhookWinEvent(IntPtr hWinEventHook);
private const int WINEVENT_INCONTEXT = 4;
private const int WINEVENT_OUTOFCONTEXT = 0;
private const int WINEVENT_SKIPOWNPROCESS = 2;
private const int WINEVENT_SKIPOWNTHREAD = 1;
private const int EVENT_SYSTEM_FOREGROUND = 3;
public static class EventLoop
{
public static void Run()
{
MSG msg;
while (true)
{
if (PeekMessage(out msg, IntPtr.Zero, 0, 0, PM_REMOVE))
{
if (msg.Message == WM_QUIT)
break;
TranslateMessage(ref msg);
DispatchMessage(ref msg);
}
}
}
[StructLayout(LayoutKind.Sequential)]
private struct MSG
{
public IntPtr Hwnd;
public uint Message;
public IntPtr WParam;
public IntPtr LParam;
public uint Time;
}
const uint PM_NOREMOVE = 0;
const uint PM_REMOVE = 1;
const uint WM_QUIT = 0x0012;
[DllImport("user32.dll")]
private static extern bool PeekMessage(out MSG lpMsg, IntPtr hwnd, uint wMsgFilterMin, uint wMsgFilterMax, uint wRemoveMsg);
[DllImport("user32.dll")]
private static extern bool TranslateMessage(ref MSG lpMsg);
[DllImport("user32.dll")]
private static extern IntPtr DispatchMessage(ref MSG lpMsg);
}
}

If you want to put your logic inside the mouse click handler you can simply call GetActiveWindow to get window handle (if you dont already have it). Then you can use GetWindowThreadProcessId to get process id from window handle.
Doing this with every mouse click looks like an overkill, however. You should probably think about hooking to active window change. Check this for details: Is there Windows system event on active window changed?

Develop Reference

C# (C-Sharp) is a programming language developed by Microsoft that runs on the .NET Framework.

Winforms Static HandleCreated or OnLoad Event - c#

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c# global system hook to detect change of active window

How to get processes from mouse event using Intptr (USER32.dll) ???

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