Develop Reference

dmDisplayFrequency showing 0. Any alternative?

I'm trying to use win32 EnumDisplaySettings to get all available resolutions and refresh rates. But when printing dmDisplayFrequency I always get 0 which means that it cannot get it. Is there any alternatives to enumDisplaySettings ? If windows is able to provide a list in display setting window then there must be another way ?
using System;
using System.Linq;
using System.Runtime.InteropServices;
namespace ListResolutions
{
class Program
{
[DllImport("user32.dll")]
public static extern bool EnumDisplaySettings(
string deviceName, int modeNum, ref DEVMODE devMode);
const int ENUM_CURRENT_SETTINGS = -1;
const int ENUM_REGISTRY_SETTINGS = -2;
[StructLayout(LayoutKind.Sequential)]
public struct DEVMODE
{
private const int CCHDEVICENAME = 0x20;
private const int CCHFORMNAME = 0x20;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
public string dmDeviceName;
public short dmSpecVersion;
public short dmDriverVersion;
public short dmSize;
public short dmDriverExtra;
public int dmFields;
public int dmPositionX;
public int dmPositionY;
public int dmDisplayFixedOutput;
public short dmColor;
public short dmDuplex;
public short dmYResolution;
public short dmTTOption;
public short dmCollate;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
public string dmFormName;
public short dmLogPixels;
public int dmBitsPerPel;
public int dmPelsWidth;
public int dmPelsHeight;
public int dmDisplayFlags;
public int dmDisplayFrequency;
public int dmICMMethod;
public int dmICMIntent;
public int dmMediaType;
public int dmDitherType;
public int dmReserved1;
public int dmReserved2;
public int dmPanningWidth;
public int dmPanningHeight;
}
static void Main(string[] args)
{
DEVMODE vDevMode = new DEVMODE();
int i = 0;
while (EnumDisplaySettings(null, i, ref vDevMode))
{
Console.WriteLine("Width:{0} Height:{1} Color:{2} Frequency:{3}",
vDevMode.dmPelsWidth,
vDevMode.dmPelsHeight,
1 << vDevMode.dmBitsPerPel, vDevMode.dmDisplayFrequency
);
i++;
}
}
}
}

c# - After changing screen resolution the cursor hover area is offset

I have the below code to change my 2nd display screen resolution. It all works fine and changes as expected. However once it has been changed my mouse/cursor is offset. eg the active location is not where the pointer shows on the screen.
Thoughts?
using System;
using System.Windows;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Drawing;
[StructLayout(LayoutKind.Sequential)]
public struct DEVMODE1
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
public string dmDeviceName;
public short dmSpecVersion;
public short dmDriverVersion;
public short dmSize;
public short dmDriverExtra;
public int dmFields;
public short dmOrientation;
public short dmPaperSize;
public short dmPaperLength;
public short dmPaperWidth;
public short dmScale;
public short dmCopies;
public short dmDefaultSource;
public short dmPrintQuality;
public short dmColor;
public short dmDuplex;
public short dmYResolution;
public short dmTTOption;
public short dmCollate;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
public string dmFormName;
public short dmLogPixels;
public short dmBitsPerPel;
public int dmPelsWidth;
public int dmPelsHeight;
public int dmPosition;
public int dmDisplayFlags;
public int dmDisplayFrequency;
public int dmICMMethod;
public int dmICMIntent;
public int dmMediaType;
public int dmDitherType;
public int dmReserved1;
public int dmReserved2;
public int dmPanningWidth;
public int dmPanningHeight;
};
class User_32
{
[DllImport("user32.dll")]
public static extern int EnumDisplaySettings(string deviceName, int modeNum, ref DEVMODE1 devMode);
[DllImport("user32.dll")]
public static extern int ChangeDisplaySettings(ref DEVMODE1 devMode, int flags);
[DllImport("user32.dll")]
public static extern int ChangeDisplaySettingsEx(string lpszDeviceName, ref DEVMODE1 lpDevMode, IntPtr hwnd, ChangeDisplaySettingsFlags dwflags, IntPtr lParam);
public const int ENUM_CURRENT_SETTINGS = -1;
public const int CDS_UPDATEREGISTRY = 0x01;
public const int CDS_TEST = 0x02;
public const int DISP_CHANGE_SUCCESSFUL = 0;
public const int DISP_CHANGE_RESTART = 1;
public const int DISP_CHANGE_FAILED = -1;
[Flags()]
public enum ChangeDisplaySettingsFlags : uint{
CDS_NONE = 0,
CDS_UPDATEREGISTRY = 0x00000001,
CDS_TEST = 0x00000002,
CDS_FULLSCREEN = 0x00000004,
CDS_GLOBAL = 0x00000008,
CDS_SET_PRIMARY = 0x00000010,
CDS_VIDEOPARAMETERS = 0x00000020,
CDS_ENABLE_UNSAFE_MODES = 0x00000100,
CDS_DISABLE_UNSAFE_MODES = 0x00000200,
CDS_RESET = 0x40000000,
CDS_RESET_EX = 0x20000000,
CDS_NORESET = 0x10000000
}
}
namespace Resolution
{
class CResolution
{
public CResolution(int iWidth, int iHeight)
{
DEVMODE1 dm = new DEVMODE1();
dm.dmFormName = new String(new char[32]);
dm.dmSize = (short)Marshal.SizeOf(dm);
dm.dmPosition = 2;
if (0 != User_32.EnumDisplaySettings(null, User_32.ENUM_CURRENT_SETTINGS, ref dm))
{
dm.dmPelsWidth = iWidth;
dm.dmPelsHeight = iHeight;
long result = User_32.ChangeDisplaySettingsEx("\\\\.\\DISPLAY2", ref dm, IntPtr.Zero, User_32.ChangeDisplaySettingsFlags.CDS_UPDATEREGISTRY, IntPtr.Zero);
}
}
}
}
-
static void Main(string[] args)
{
Resolution.CResolution ChangeRes = new Resolution.CResolution(2560, 1600);
}

Get the supported screen resolutions in XNA?

How can I get the supported screen resolutions in XNA? Like when you change the screen resolution in windows, and instead of giving you a list of all the possible choices, it gives you just a few of them.

Just use this:
foreach (DisplayMode mode in GraphicsAdapter.DefaultAdapter.SupportedDisplayModes) {
//mode.whatever (and use any of avaliable information)
}
But it will give you few duplicates, because it also takes into accound refrash rate, so you might include that aswel, or do some filtering.

I'm not that up-to-date with XNA, but I didn't think there was a quick and easy function. There is a way using the old WinForms API, but as I personally don't want to link against that in other applications the easiest way is to use the native functions.
First, define the native struct that will be used:
[StructLayout(LayoutKind.Sequential)]
internal struct DEVMODE
{
private const int CCHDEVICENAME = 0x20;
private const int CCHFORMNAME = 0x20;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
public string dmDeviceName;
public short dmSpecVersion;
public short dmDriverVersion;
public short dmSize;
public short dmDriverExtra;
public int dmFields;
public int dmPositionX;
public int dmPositionY;
public int dmDisplayOrientation;
public int dmDisplayFixedOutput;
public short dmColor;
public short dmDuplex;
public short dmYResolution;
public short dmTTOption;
public short dmCollate;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
public string dmFormName;
public short dmLogPixels;
public int dmBitsPerPel;
public int dmPelsWidth;
public int dmPelsHeight;
public int dmDisplayFlags;
public int dmDisplayFrequency;
public int dmICMMethod;
public int dmICMIntent;
public int dmMediaType;
public int dmDitherType;
public int dmReserved1;
public int dmReserved2;
public int dmPanningWidth;
public int dmPanningHeight;
}
We also need to define the two native functions we will use:
[DllImport("user32.dll")]
private static extern bool EnumDisplaySettings(string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode);
[DllImport("user32.dll")]
private static extern int GetSystemMetrics(int nIndex);
And last, our functions to list all screen resolutions and one to get the current screen resolution:
public static List<string> GetScreenResolutions()
{
var resolutions = new List<string>();
try
{
var devMode = new DEVMODE();
int i = 0;
while (EnumDisplaySettings(null, i, ref devMode))
{
resolutions.Add(string.Format("{0}x{1}", devMode.dmPelsWidth, devMode.dmPelsHeight));
i++;
}
resolutions = resolutions.Distinct(StringComparer.InvariantCulture).ToList();
}
catch (Exception ex)
{
Console.WriteLine("Could not get screen resolutions.");
}
return resolutions;
}
public static string GetCurrentScreenResolution()
{
int width = GetSystemMetrics(0x00);
int height = GetSystemMetrics(0x01);
return string.Format("{0}x{1}", width, height);
}

How can I use automation to right-click with a mouse in Windows 7?

I've spent a while getting my mouse to be able to right-click in Windows XP. Here's the code:
public class Mouse
{
[DllImport("user32.dll", SetLastError = true)]
internal static extern uint SendInput(uint numberOfInputs, Input[] inputs, int sizeOfInputStructure);
private const int RightDown = 0x0008;
private const int RightUp = 0x0010;
private const int InputMouse = 0;
public void RightClick<T>(T element) where T: AutomationElementWrapper
{
var point = element.Element.GetClickablePoint();
var processId = element.Element.GetCurrentPropertyValue(AutomationElement.ProcessIdProperty);
var window = AutomationElement.RootElement.FindFirst(
TreeScope.Children,
new PropertyCondition(AutomationElement.ProcessIdProperty,
processId));
window.SetFocus();
var x = (int)point.X;
var y = (int)point.Y;
System.Windows.Forms.Cursor.Position = new System.Drawing.Point(x, y);
SendInput(2, new[] {InputFor(RightDown, x, y), InputFor(RightUp, x, y)}, Marshal.SizeOf(typeof (Input)));
}
private static Input InputFor(uint mouseButtonAction, int x, int y)
{
var input = new Input
{
Dx = x,
Dy = y,
MouseData = 0,
DwFlags = mouseButtonAction,
Time = 0,
DwType = InputMouse,
MouseExtraInfo = new IntPtr()
};
return input;
}
internal struct Input
{
public int DwType;
public int Dx;
public int Dy;
public uint MouseData;
public uint DwFlags;
public uint Time;
public IntPtr MouseExtraInfo;
}
}
This doesn't work in Windows 7. Why not, and how do I fix it?
For more information, I'm using this in an automation tool to bring up a context menu.
Edit: #GSerg's link looks helpful. I'm not sure what goes in the "type" field of the input once you've added the union, though - I left it blank, and now this causes my screensaver to come on. Ah, the joys of Win32. Any help appreciated.

Here's my attempt at a solution - this test program combines the code from the opening question, the pinvoke.net SendInput page, and the oldnewthing 64-bit structure alignment workaround linked to by GSerg.
With this, right-clicking works for me on Win7 x64:
using System;
using System.Runtime.InteropServices;
using System.Windows.Automation;
using WiPFlash;
using WiPFlash.Components;
using WiPFlash.Framework;
using WiPFlash.Util;
using WiPFlash.Exceptions;
using NUnit.Framework;
namespace MouseRightClick
{
class Program
{
static void Main(string[] args)
{
Application application = new ApplicationLauncher(TimeSpan.Parse("00:00:20"))
.LaunchOrRecycle("foo", #"C:\\hg\\wipflash\\Example.PetShop\\bin\\Debug\\Example.PetShop.exe", Assert.Fail);
var window = application.FindWindow("petShopWindow");
var totalLabel = window.Find<Label>("copyPetContextTarget");
Mouse mouse = new Mouse();
mouse.RightClick(totalLabel);
}
}
public class Mouse
{
[DllImport("user32.dll", SetLastError = true)]
static extern uint SendInput(uint numberOfInputs, INPUT[] inputs, int sizeOfInputStructure);
private const int MOUSEEVENTF_RIGHTDOWN = 0x0008;
private const int MOUSEEVENTF_RIGHTUP = 0x0010;
private const int INPUT_MOUSE = 0;
private const int INPUT_KEYBOARD = 1;
private const int INPUT_HARDWARE = 2;
public void RightClick<T>(T element) where T : AutomationElementWrapper
{
var point = element.Element.GetClickablePoint();
var processId = element.Element.GetCurrentPropertyValue(AutomationElement.ProcessIdProperty);
var window = AutomationElement.RootElement.FindFirst(
TreeScope.Children,
new PropertyCondition(AutomationElement.ProcessIdProperty,
processId));
window.SetFocus();
var x = (int)point.X;
var y = (int)point.Y;
System.Windows.Forms.Cursor.Position = new System.Drawing.Point(x, y);
SendInput(2, new[] {
InputFor(MOUSEEVENTF_RIGHTDOWN, x, y),
InputFor(MOUSEEVENTF_RIGHTUP, x, y) },
Marshal.SizeOf(typeof(INPUT)));
}
private static INPUT InputFor(uint mouseButtonAction, int x, int y)
{
var input = new INPUT();
input.type = INPUT_MOUSE;
input.u.mi.dwFlags = mouseButtonAction;
input.u.mi.time = 0;
input.u.mi.dwExtraInfo = IntPtr.Zero;
return input;
}
[StructLayout(LayoutKind.Sequential)]
internal struct MOUSEINPUT
{
public int dx;
public int dy;
public uint mouseData;
public uint dwFlags;
public uint time;
public IntPtr dwExtraInfo;
}
[StructLayout(LayoutKind.Sequential)]
internal struct KEYBDINPUT
{
public ushort wVk;
public ushort wScan;
public uint dwFlags;
public uint time;
public IntPtr dwExtraInfo;
}
[StructLayout(LayoutKind.Sequential)]
internal struct HARDWAREINPUT
{
public uint uMsg;
public ushort wParamL;
public ushort wParamH;
}
[StructLayout(LayoutKind.Explicit)]
internal struct INPUT_UNION
{
[FieldOffset(0)]
public MOUSEINPUT mi;
[FieldOffset(0)]
public KEYBDINPUT ki;
[FieldOffset(0)]
public HARDWAREINPUT hi;
};
[StructLayout(LayoutKind.Sequential)]
internal struct INPUT
{
public int type;
public INPUT_UNION u;
}
}
}

How to list available video modes using C#?

I've found nice examples using C++ (http://www.codeproject.com/KB/tips/resswitch.aspx), but not in C#.
Can someone help, please?
Edit:
The exact function that list the video modes is:
BOOL CVideoModes::GetAvailableVideoModes(CAvailableVideoModes& modes)
{
modes.SetSize(0, 5);
int i=0;
DEVMODE dm;
while (EnumDisplaySettings(NULL, i, &dm))
{
CVideoMode thismode(dm.dmBitsPerPel, dm.dmPelsWidth,
dm.dmPelsHeight, dm.dmDisplayFrequency);
modes.SetAtGrow(i, thismode);
++i;
}
modes.FreeExtra();
return (i>0);
}
But sincerelly I cannot understand that C++ code. Where I can find that "thismode" function?

If you mean video modes are available resolutions, try to invoke EnumDisplaySettingsEx
details can be found here:
http://msdn.microsoft.com/en-us/library/dd162612(VS.85).aspx
small program that lists available resolutions:
using System;
using System.Linq;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace ListResolutions
{
class Program
{
[DllImport("user32.dll")]
public static extern bool EnumDisplaySettings(
string deviceName, int modeNum, ref DEVMODE devMode);
const int ENUM_CURRENT_SETTINGS = -1;
const int ENUM_REGISTRY_SETTINGS = -2;
[StructLayout(LayoutKind.Sequential)]
public struct DEVMODE
{
private const int CCHDEVICENAME = 0x20;
private const int CCHFORMNAME = 0x20;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
public string dmDeviceName;
public short dmSpecVersion;
public short dmDriverVersion;
public short dmSize;
public short dmDriverExtra;
public int dmFields;
public int dmPositionX;
public int dmPositionY;
public ScreenOrientation dmDisplayOrientation;
public int dmDisplayFixedOutput;
public short dmColor;
public short dmDuplex;
public short dmYResolution;
public short dmTTOption;
public short dmCollate;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
public string dmFormName;
public short dmLogPixels;
public int dmBitsPerPel;
public int dmPelsWidth;
public int dmPelsHeight;
public int dmDisplayFlags;
public int dmDisplayFrequency;
public int dmICMMethod;
public int dmICMIntent;
public int dmMediaType;
public int dmDitherType;
public int dmReserved1;
public int dmReserved2;
public int dmPanningWidth;
public int dmPanningHeight;
}
static void Main(string[] args)
{
DEVMODE vDevMode = new DEVMODE();
int i = 0;
while (EnumDisplaySettings(null, i, ref vDevMode))
{
Console.WriteLine("Width:{0} Height:{1} Color:{2} Frequency:{3}",
vDevMode.dmPelsWidth,
vDevMode.dmPelsHeight,
1 << vDevMode.dmBitsPerPel, vDevMode.dmDisplayFrequency
);
i++;
}
}
}
}