Develop Reference

How do I put a full screen window on top in C# after screen is cloned?

I am working on a C# WPF application that uses two screens. In the application the user is able to clone or extend the screen depending on what the user want to do. This is done in windows 7 and is using the following code:
[DllImport("user32.dll", CharSet = System.Runtime.InteropServices.CharSet.Unicode)]
private static extern long SetDisplayConfig(uint numPathArrayElements, IntPtr pathArray, uint numModeArrayElements, IntPtr modeArray, uint flags);
UInt32 SDC_TOPOLOGY_INTERNAL = 0x00000001;
UInt32 SDC_TOPOLOGY_CLONE = 0x00000002;
UInt32 SDC_TOPOLOGY_EXTEND = 0x00000004;
UInt32 SDC_TOPOLOGY_EXTERNAL = 0x00000008;
UInt32 SDC_APPLY = 0x00000080;
public void CloneDisplays()
{
SetDisplayConfig(0, IntPtr.Zero, 0, IntPtr.Zero, (SDC_APPLY | SDC_TOPOLOGY_CLONE));
}
public void ExtendDisplays()
{
SetDisplayConfig(0, IntPtr.Zero, 0, IntPtr.Zero, (SDC_APPLY | SDC_TOPOLOGY_EXTEND));
}
Now to my problem. When using the above code I manage to clone/extend the screen. However, after this is done the taskbar at the bottom of the screen is in front of the full screen application which should not be the case. How do i put the application window back at the top?
Additional information:
When I start the application it starts in fullscreen with the taskbar behind the application. This is done by setting the following:
WindowState="Maximized"
WindowStyle="None"
And this is what I want after the clone/extend has been done.
Thanks
Edit:
I have noticed that after I clone/extend the screen and sleep for say 5 seconds everything works as it should. However, as soon as the 5 seconds is over and the function exits the taskbar gets on top. Therefore it seems that I can not change something right after the clone/extend because the taskbar will always get on top in the end. So somehow I have to figure out how to stop the taskbar to behave like this, instead of changing the property of the window.

Try setting the width and height of the WPF window as follows, You could set this within window constructor.
Width = System.Windows.SystemParameters.PrimaryScreenWidth;
Height = System.Windows.SystemParameters.PrimaryScreenWidth;
To hide the taskbar try setting,
Width = System.Windows.SystemParameters.FullPrimaryScreenWidth;
Height = System.Windows.SystemParameters.FullPrimaryScreenHeight;

I'm already doing full-screen mode within my winforms applications, but i think you can do it more or less the same within WPF:
(this has to be different but similar in WPF):
form.WindowState = FormWindowState.Normal;
form.FormBorderStyle = FormBorderStyle.None;
form.Bounds = Screen.GetBounds(form);
Then the next step is to hide the task-bar if your application is on the primary screen:
if (Screen.PrimaryScreen.Equals(Screen.FromRectangle(Screen.GetBounds(form))))
{
ShowWindowsToolbar(false);
}
And the method ShowWindowsToolbar() is implemented as follows:
[DllImport("user32.dll")]
private static extern int FindWindow(string lpszClassName, string lpszWindowName);
[DllImport("user32.dll")]
private static extern int ShowWindow(int hWnd, int nCmdShow);
private const int SW_HIDE = 0;
private const int SW_SHOW = 1;
public void WindowsToolbar(bool visible)
{
int hWnd = FindWindow("Shell_TrayWnd", "");
ShowWindow(hWnd, visible ? SW_SHOW : SW_HIDE);
}
That's the way, how most of the tools out there support this kind of stuff. Also note, that this mode can mostly entered/leaved by pressing F11. So it would be good, if you also support this keystroke.

Turns out all I have to do is update the dispatcher queue and force it to do the update right after the clone/extend has been done. Then I can update the window properties.
public void ExtendDisplays()
{
SetDisplayConfig(0, IntPtr.Zero, 0, IntPtr.Zero, (SDC_APPLY | SDC_TOPOLOGY_EXTEND));
this.Dispatcher.Invoke(DispatcherPriority.Background, new ThreadStart(delegate { })); //Force update
current_window.hide();
current_window.show();
}

Unable to Calculate Position within Owner-Draw Text

I'm trying to use Visual Studio 2012 to create a Windows Forms application that can place the caret at the current position within a owner-drawn string. However, I've been unable to find a way to accurately calculate that position.
I've done this successfully before in C++. I've tried numerous methods in C# but have not yet been able to position the caret accurately. Originally, I tried using .NET classes to determine the correct position, but then I tried accessing the Windows API directly. In some cases, I came close, but after some time I still cannot place the caret accurately.
I've created a small test program and posted key parts below. I've also posted the entire project here.
The exact font used is not important to me; however, my application assumes a mono-spaced font. Any help is appreciated.
Form1.cs
This is my main form.
public partial class Form1 : Form
{
private string TestString;
private int AveCharWidth;
private int Position;
public Form1()
{
InitializeComponent();
TestString = "123456789012345678901234567890123456789012345678901234567890";
AveCharWidth = GetFontWidth();
Position = 0;
}
private void Form1_Load(object sender, EventArgs e)
{
Font = new Font(FontFamily.GenericMonospace, 12, FontStyle.Regular, GraphicsUnit.Pixel);
}
protected override void OnGotFocus(EventArgs e)
{
Windows.CreateCaret(Handle, (IntPtr)0, 2, (int)Font.Height);
Windows.ShowCaret(Handle);
UpdateCaretPosition();
base.OnGotFocus(e);
}
protected void UpdateCaretPosition()
{
Windows.SetCaretPos(Padding.Left + (Position * AveCharWidth), Padding.Top);
}
protected override void OnLostFocus(EventArgs e)
{
Windows.HideCaret(Handle);
Windows.DestroyCaret();
base.OnLostFocus(e);
}
protected override void OnPaint(PaintEventArgs e)
{
e.Graphics.DrawString(TestString, Font, SystemBrushes.WindowText,
new PointF(Padding.Left, Padding.Top));
}
protected override bool IsInputKey(Keys keyData)
{
switch (keyData)
{
case Keys.Right:
case Keys.Left:
return true;
}
return base.IsInputKey(keyData);
}
protected override void OnKeyDown(KeyEventArgs e)
{
switch (e.KeyCode)
{
case Keys.Left:
Position = Math.Max(Position - 1, 0);
UpdateCaretPosition();
break;
case Keys.Right:
Position = Math.Min(Position + 1, TestString.Length);
UpdateCaretPosition();
break;
}
base.OnKeyDown(e);
}
protected int GetFontWidth()
{
int AverageCharWidth = 0;
using (var graphics = this.CreateGraphics())
{
try
{
Windows.TEXTMETRIC tm;
var hdc = graphics.GetHdc();
IntPtr hFont = this.Font.ToHfont();
IntPtr hOldFont = Windows.SelectObject(hdc, hFont);
var a = Windows.GetTextMetrics(hdc, out tm);
var b = Windows.SelectObject(hdc, hOldFont);
var c = Windows.DeleteObject(hFont);
AverageCharWidth = tm.tmAveCharWidth;
}
catch
{
}
finally
{
graphics.ReleaseHdc();
}
}
return AverageCharWidth;
}
}
Windows.cs
Here are my Windows API declarations.
public static class Windows
{
[Serializable, StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct TEXTMETRIC
{
public int tmHeight;
public int tmAscent;
public int tmDescent;
public int tmInternalLeading;
public int tmExternalLeading;
public int tmAveCharWidth;
public int tmMaxCharWidth;
public int tmWeight;
public int tmOverhang;
public int tmDigitizedAspectX;
public int tmDigitizedAspectY;
public short tmFirstChar;
public short tmLastChar;
public short tmDefaultChar;
public short tmBreakChar;
public byte tmItalic;
public byte tmUnderlined;
public byte tmStruckOut;
public byte tmPitchAndFamily;
public byte tmCharSet;
}
[DllImport("user32.dll")]
public static extern bool CreateCaret(IntPtr hWnd, IntPtr hBitmap, int nWidth, int nHeight);
[DllImport("User32.dll")]
public static extern bool SetCaretPos(int x, int y);
[DllImport("User32.dll")]
public static extern bool DestroyCaret();
[DllImport("User32.dll")]
public static extern bool ShowCaret(IntPtr hWnd);
[DllImport("User32.dll")]
public static extern bool HideCaret(IntPtr hWnd);
[DllImport("gdi32.dll", CharSet = CharSet.Auto)]
public static extern bool GetTextMetrics(IntPtr hdc, out TEXTMETRIC lptm);
[DllImport("gdi32.dll")]
public static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);
[DllImport("GDI32.dll")]
public static extern bool DeleteObject(IntPtr hObject);
}
Edit
The code I've posted has an issue that makes it even more inaccurate. This is a result of trying many different approaches, some more accurate than this. What I'm looking for is a fix that makes it "fully accurate", as it is in my MFC Hex Editor Control in C++.

I tried out your GetFontWidth(), and the width of a character returned was 7.
I then tried out TextRenderer.MearureText on varying lengths of text and had values ranging from 14 through to 7.14 for text of length 1 to 50 respectively with an average character width of 7.62988874736612.
Here is the code I used:
var text = "";
var sizes = new System.Collections.Generic.List<double>();
for (int i = 1; i <= 50; i++)
{
text += (i % 10).ToString();
var ts = TextRenderer.MeasureText(text, this.Font);
sizes.Add((ts.Width * 1.0) / text.Length);
}
sizes.Add(sizes.Average());
Clipboard.SetText(string.Join("\r\n",sizes));
Not satisfied with the results of my little 'experiment', I decided to see how the text was rendered onto the form. Below is a screen capture of the form (magnified 8x).
On close inspection, I observed that
There was an amount of separation between the characters. This made the length of a block of text (1234567890) is 74 pixels long.
There is some space (3px) in front of the text being drawn even though the left padding is 0.
What does this mean to you?
If you use your code to calculate the width of a font character, you fail to account for the separating space between two characters.
Using the TextRenderer.DrawText can give you varying character widths rendering it quite uselesss.
What are your remaining options?
The best way I can see out of this is to hard-code the placement of your text. That way you know the position of each character and can accurately place the cursor at any desired location.
Needless to say, this is likely going to call for a lot of code.
Your second option is to run tests like I did to find the length of a block of text and then divide by the length of the block to find the average character width.
The problem with this is that your code is not likely to scale properly. For example, changing the size of the font or the user's screen DPI can cause a lot of trouble for the program.
Other things I observed
The space inserted in-front of the text is equivalent to the width of the caret (2px in my case) plus 1px (Total of 3px).
Hard-coding the width of each character to 7.4 works perfectly.

You can use the System.Windows.Forms.TextRenderer to in order to draw the string as well as to calculate its metrics. Various method overloads for both operations exist
TextRenderer.DrawText(e.Graphics, "abc", font, point, Color.Black);
Size measure = TextRenderer.MeasureText(e.Graphics, "1234567890", font);
I have made good experiences with TextRenderer and its accuracy.
UPDATE
I determined the font size like this in one of my applications and it worked perfectly
const TextFormatFlags textFormatFlags =
TextFormatFlags.NoPadding | TextFormatFlags.NoPrefix |
TextFormatFlags.PreserveGraphicsClipping;
fontSize = TextRenderer.MeasureText(this.g, "_", font,
new Size(short.MaxValue, short.MaxValue),
textFormatFlags);
height = fontSize.Height;
width = fontSize.Width;
Make sure to use the same format flags for both drawing and measuring.
(This way of determining the font size of cause works only for monospaced fonts.)

Moving Mouse in C# (coordinate units)

I'm trying to make Teamviewer like piece of software for fun, which allows one person to view another person's screen and click and all that. Anyway, I have most all of the socket stuff done, but I don't know how to get the mouse clicks to work correctly. Here is the code I found online for moving the mouse programmatically:
public static class VirtualMouse
{
// import the necessary API function so .NET can
// marshall parameters appropriately
[DllImport("user32.dll")]
static extern void mouse_event(int dwFlags, int dx, int dy, int dwData, int dwExtraInfo);
// constants for the mouse_input() API function
private const int MOUSEEVENTF_MOVE = 0x0001;
private const int MOUSEEVENTF_LEFTDOWN = 0x0002;
private const int MOUSEEVENTF_LEFTUP = 0x0004;
private const int MOUSEEVENTF_RIGHTDOWN = 0x0008;
private const int MOUSEEVENTF_RIGHTUP = 0x0010;
private const int MOUSEEVENTF_MIDDLEDOWN = 0x0020;
private const int MOUSEEVENTF_MIDDLEUP = 0x0040;
private const int MOUSEEVENTF_ABSOLUTE = 0x8000;
// simulates movement of the mouse. parameters specify changes
// in relative position. positive values indicate movement
// right or down
public static void Move(int xDelta, int yDelta)
{
mouse_event(MOUSEEVENTF_MOVE, xDelta, yDelta, 0, 0);
}
// simulates movement of the mouse. parameters specify an
// absolute location, with the top left corner being the
// origin
public static void MoveTo(int x, int y)
{
mouse_event(MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_MOVE, x, y, 0, 0);
}
// simulates a click-and-release action of the left mouse
// button at its current position
public static void LeftClick()
{
mouse_event(MOUSEEVENTF_LEFTDOWN, Control.MousePosition.X, Control.MousePosition.Y, 0, 0);
mouse_event(MOUSEEVENTF_LEFTUP, Control.MousePosition.X, Control.MousePosition.Y, 0, 0);
}
}
Now I want to move the mouse using the MoveTo method, but it requires crazy high numbers for any movement. Is there anyway I can match coordinates for moving here to the position on screen in pixels? Sorry if this seems like an obvious question, but I've googled for almost an hour and I can't find any discussion of what units are being used for the mouse x and y position, so I can't set up any sort of formula to match clicks on one panel to clicks on the user's screen.

From Microsoft's documentation:
If MOUSEEVENTF_ABSOLUTE value is specified, dx and dy contain
normalized absolute coordinates between 0 and 65,535. The event
procedure maps these coordinates onto the display surface. Coordinate
(0,0) maps onto the upper-left corner of the display surface,
(65535,65535) maps onto the lower-right corner.
You can use that to convert the input in pixels to the desired value, like this:
var inputXinPixels = 200;
var inputYinPixels = 200;
var screenBounds = System.Windows.Forms.Screen.PrimaryScreen.Bounds;
var outputX = inputXinPixels * 65535 / screenBounds.Width;
var outputY = inputYinPixels * 65535 / screenBounds.Height;
MoveTo(outputX, outputY);
Please keep in mind that this may not be correct for multiple monitors. Also notice that the documention says:
This function has been superseded. Use SendInput instead.
Addendum: As pointed by J3soon the above formula might not be the best. Based on research done for AutoHokey the internal the following code works better:
var outputX = (inputXinPixels * 65536 / screenBounds.Width) + 1;
var outputY = (inputYinPixels * 65536 / screenBounds.Height) + 1;
See AutoHotkey source code for reference.
If I were in your position I would use Cursor.Position. The following code works as expected:
System.Windows.Forms.Cursor.Position = new System.Drawing.Point(200, 200);
Yes, it places the mouse pointer in the coordinates (200, 200) pixels of the screen [Tested on LinqPad].
Addendum: I had a look at what does System.Windows.Forms.Cursor.Position use internally - On Mono on Windows at least. It is a call to SetCursorPos. No weird coordinate conversion needed.

What's the best way to enter numbers in Windows Mobile? (.NET CF 3.5)

There must be a better way than a constrained numeric updown control.

The easiest way to enter numbers (especially non-integer numbers) in Windows Mobile (or in a regular Windows application) is to just have a text box that the users type into, and then validate that they've entered a proper number.
The problem with this approach in Windows Mobile is that the default SIP (Soft Input Panel aka little pop-up keyboard) looks like this:
alt text http://img510.imageshack.us/img510/6210/sipreg.jpg
On a real Windows Mobile device, the SIP looks even smaller than this, and it is a gigantic pain in the keister to hit the little number keys at the top correctly. What you want to use for this purpose is the Numeric mode, which you get by clicking the "123" button in the upper left corner, and looks like this:
alt text http://img16.imageshack.us/img16/6128/sipnum.jpg
The problem with this is that there is no (simple) way programatically to make this mode of the SIP appear instead of the regular keyboard. To get the SIP to appear in numeric mode, add a reference to your project to Microsoft.WindowsCE.Forms, and then add this code as a class named "SIPHandler" (you will have to change the namespace to your project's namespace):
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Drawing;
using Microsoft.WindowsCE.Forms;
namespace DeviceApplication1
{
/// <summary>
/// Handles showing and hiding of Soft Input Panel (SIP). Better to use these
/// methods than having an InputControl on a form. InputControls behave oddly
/// if you have multiple forms open.
/// </summary>
public class SIPHandler
{
public static void ShowSIP()
{
SipShowIM(1);
}
public static void ShowSIPNumeric()
{
SipShowIM(1);
SetKeyboardToNumeric();
}
public static void ShowSIPRegular()
{
SipShowIM(1);
SetKeyboardToRegular();
}
public static void HideSIP()
{
SipShowIM(0);
}
private static void SetKeyboardToRegular()
{
// Find the SIP window
IntPtr hWnd = FindWindow("SipWndClass", null);
// Go one level below as the actual SIP window is a child
hWnd = GetWindow(hWnd, GW_CHILD);
// Obtain its context and get a color sample
// The premise here is that the numeric mode is controlled by a virtual button in the top left corner
// Whenever the numeric mode is active, the button background will be of COLOR_WINDOW_TEXT
IntPtr hDC = GetDC(hWnd);
int pixel = GetPixel(hDC, 2, 2);
// Notice that we cannot simply compare the color to the system color as the system color is 24 bit (or palette)
// and the real color is dithered to 15-16 bits for most devices, so white (0xff, 0xff, 0xff) becomes
// almost white (oxf8, 0xfc, 0xf8)
// ken's hack: here we only want to simulate the click if the keyboard is in numeric mode, in
// which case the back color will be WindowText
//int clrText = (SystemColors.Window.R) | (SystemColors.Window.G << 8) | (SystemColors.Window.B << 16);
int clrText = (SystemColors.WindowText.R) | (SystemColors.WindowText.G << 8) | (SystemColors.WindowText.B << 16);
SetPixel(hDC, 2, 2, clrText);
int pixelNew = GetPixel(hDC, 2, 2);
// Restore the original pixel
SetPixel(hDC, 2, 2, pixel);
if (pixel == pixelNew)
{
// Simulate stylus click
Message msg = Message.Create(hWnd, WM_LBUTTONDOWN, new IntPtr(1), new IntPtr(0x00090009));
MessageWindow.SendMessage(ref msg);
msg = Message.Create(hWnd, WM_LBUTTONUP, new IntPtr(0), new IntPtr(0x00090009));
MessageWindow.SendMessage(ref msg);
}
// Free resources
ReleaseDC(hWnd, hDC);
}
private static void SetKeyboardToNumeric()
{
// Find the SIP window
IntPtr hWnd = FindWindow("SipWndClass", null);
// Go one level below as the actual SIP window is a child
hWnd = GetWindow(hWnd, GW_CHILD);
// Obtain its context and get a color sample
// The premise here is that the numeric mode is controlled by a virtual button in the top left corner
// Whenever the numeric mode is active, the button background will be of COLOR_WINDOW_TEXT
IntPtr hDC = GetDC(hWnd);
int pixel = GetPixel(hDC, 2, 2);
// Notice that we cannot simply compare the color to the system color as the system color is 24 bit (or palette)
// and the real color is dithered to 15-16 bits for most devices, so white (0xff, 0xff, 0xff) becomes
// almost white (oxf8, 0xfc, 0xf8)
int clrText = (SystemColors.Window.R) | (SystemColors.Window.G << 8) | (SystemColors.Window.B << 16);
SetPixel(hDC, 2, 2, clrText);
int pixelNew = GetPixel(hDC, 2, 2);
// Restore the original pixel
SetPixel(hDC, 2, 2, pixel);
if (pixel == pixelNew)
{
// Simulate stylus click
Message msg = Message.Create(hWnd, WM_LBUTTONDOWN, new IntPtr(1), new IntPtr(0x00090009));
MessageWindow.SendMessage(ref msg);
msg = Message.Create(hWnd, WM_LBUTTONUP, new IntPtr(0), new IntPtr(0x00090009));
MessageWindow.SendMessage(ref msg);
}
// Free resources
ReleaseDC(hWnd, hDC);
}
[DllImport("coredll.dll")]
private extern static bool SipShowIM(int dwFlag);
[DllImport("coredll.dll")]
private extern static IntPtr FindWindow(string wndClass, string caption);
[DllImport("coredll.dll")]
private extern static IntPtr GetWindow(IntPtr hWnd, int nType);
[DllImport("coredll.dll")]
private extern static int GetPixel(IntPtr hdc, int nXPos, int nYPos);
[DllImport("coredll.dll")]
private extern static void SetPixel(IntPtr hdc, int nXPos, int nYPos, int clr);
[DllImport("coredll.dll")]
private extern static IntPtr GetDC(IntPtr hWnd);
[DllImport("coredll.dll")]
private extern static void ReleaseDC(IntPtr hWnd, IntPtr hDC);
[DllImport("coredll.dll")]
private static extern bool SipSetCurrentIM(byte[] clsid);
const int WM_LBUTTONDOWN = 0x0201;
const int WM_LBUTTONUP = 0x0202;
const int GW_CHILD = 5;
}
}
Sorry about the length. To pop the SIP up in numeric mode, you just use this line:
SIPHandler.ShowSIPNumeric();
or to make it appear in regular keyboard mode:
SIPHandler.ShowSIPRegular();
And to hide it again:
SIPHandler.HideSIP();
The basic trick behind this code is to sort of "peek" the color in the upper left corner to determine whether the SIP is already in regular keyboard or numeric mode, and then to simulate a mouse click (if necessary) in the same corner to ensure that the SIP is in the mode desired.
Note: this is "borrowed" web code, but I no longer know where I got it from. If anyone on SO knows where this hack came from, please let me know and I'll be happy to attribute it to the original author.
Update: well, after 2 seconds of Googling, I've found that the proximate source of this code was Daniel Moth:
http://www.danielmoth.com/Blog/InputPanelEx.cs
... who credits Alex Feinman with the original:
http://www.alexfeinman.com/download.asp?doc=IMSwitch.zip
Thanks, guys! This code actually brought me to tears once (I was chopping onions at the time, but that couldn't have been it).

The MaskedTextBox might be of use. Failing that, I recommend using an ordinary TextBox with an OnTextChange event handler that checks to make sure the value entered is actually a number. Any non-numerical characters, and you can bang out a message box, or simply remove those characters completely, depending on your needs.
The NumericUpDown controls are slow to use sometimes, but they have intrinsic data validation which in some cases is quite useful. If the control is one the user is not going to use often, consider using it. Otherwise the MaskedTextBox or TextBox is the way to go.

Another approach to this problem is to use a multi-level ContextMenu, where the first layer of options covers ranges of numbers, and the second layers let the users pick specific values, like this:
alt text http://img19.imageshack.us/img19/6329/dropdowns.jpg
You can create the full menu structure ahead of time (kind of a pain) or just load the structure dynamically depending on the range of values and the resolutions required. You can do this with hundreds of menu items in much less than a second, even on Windows Mobile devices.
This approach also works very well for entering monetary values.

Moving mouse cursor programmatically

To start out I found this code at http://swigartconsulting.blogs.com/tech_blender/2005/08/how_to_move_the.html:
public class Win32
{
[DllImport("User32.Dll")]
public static extern long SetCursorPos(int x, int y);
[DllImport("User32.Dll")]
public static extern bool ClientToScreen(IntPtr hWnd, ref POINT point);
[StructLayout(LayoutKind.Sequential)]
public struct POINT
{
public int x;
public int y;
}
}
Paste the following code in the button's click eventhandler:
Win32.POINT p = new Win32.POINT();
p.x = button1.Left + (button1.Width / 2);
p.y = button1.Top + (button1.Height / 2);
Win32.ClientToScreen(this.Handle, ref p);
Win32.SetCursorPos(p.x, p.y);
This will move the mouse pointer to the center of the button.
This code works great, but I can't seem to figure out how to extend it a bit. Let's say I have internet explorer (embedded in a windows form) open to a web page (some random page I don't know about before hand) with a drop down list box in it. I've modified the above code to move the cursor over and get the list box to drop down(using the mouse click method shown below to drop the list down), and also move up and down the list highlighting each item as the mouse pointer goes over, but for the life of me I cannot figure out how to actually make the mouse click on the currently selected item to keep the selection. The way I'm doing it now the drop down list box just closes and the selection isn't changed. I'm using the following code for the mouse click (which does get the list to drop down):
private static void MouseClick(int x, int y, IntPtr handle) //handle for the browser window
{
IntPtr lParam = (IntPtr)((y << 16) | x); // The coordinates
IntPtr wParam = IntPtr.Zero; // Additional parameters for the click (e.g. Ctrl)
const uint downCode = 0x201; // Left click down code
const uint upCode = 0x202; // Left click up code
SendMessage(handle, downCode, wParam, lParam); // Mouse button down
SendMessage(handle, upCode, wParam, lParam); // Mouse button up
}
I'm sure I'm missing something simple here, but for the life of me cannot figure out what it is. Thanks in advance everyone.
Bob

I believe that you're missing a correct WPARAM for the WM_LBUTTONDOWN message, which for the left-button is MK_LBUTTON
#define MK_LBUTTON 0x0001