public static void initialize()
{
#region
PrintVisibleWindowsHandle.PrintVisibleWindowHandles(2);
W32.SendMessageTimeout(progman,
0x052C,
new IntPtr(0),
IntPtr.Zero,
W32.SendMessageTimeoutFlags.SMTO_NORMAL,
1000,
out result);
PrintVisibleWindowsHandle.PrintVisibleWindowHandles(2);
W32.EnumWindows(new W32.EnumWindowsProc((tophandle, topparamhandle) =>
{
IntPtr p = W32.FindWindowEx(tophandle,
IntPtr.Zero,
"SHELLDLL_DefView",
IntPtr.Zero);
if (p != IntPtr.Zero)
{
workerw = W32.FindWindowEx(IntPtr.Zero,
tophandle,
"WorkerW",
IntPtr.Zero);
}
return(true);
}), IntPtr.Zero);
#endregion
}
public void test()
{
PrintVisibleWindowsHandle.PrintVisibleWindowHandles(2);
#region
// The output will look something like this.
// .....
// 0x00010190 "" WorkerW
// ...
// 0x000100EE "" SHELLDLL_DefView
// 0x000100F0 "FolderView" SysListView32
// 0x000100EC "Program Manager" Progman
// Fetch the Progman window
IntPtr progman = W32.FindWindow("Progman", null);
IntPtr result = IntPtr.Zero;
// Send 0x052C to Progman. This message directs Progman to spawn a
// WorkerW behind the desktop icons. If it is already there, nothing
// happens.
W32.SendMessageTimeout(progman,
0x052C,
new IntPtr(0),
IntPtr.Zero,
W32.SendMessageTimeoutFlags.SMTO_NORMAL,
1000,
out result);
#endregion
PrintVisibleWindowsHandle.PrintVisibleWindowHandles(2);
// The output will look something like this
// .....
// 0x00010190 "" WorkerW
// ...
// 0x000100EE "" SHELLDLL_DefView
// 0x000100F0 "FolderView" SysListView32
// 0x00100B8A "" WorkerW <--- This is the WorkerW instance we are after!
// 0x000100EC "Program Manager" Progman
IntPtr workerw = IntPtr.Zero;
// We enumerate all Windows, until we find one, that has the SHELLDLL_DefView
// as a child.
// If we found that window, we take its next sibling and assign it to workerw.
W32.EnumWindows(new W32.EnumWindowsProc((tophandle, topparamhandle) =>
{
IntPtr p = W32.FindWindowEx(tophandle,
IntPtr.Zero,
"SHELLDLL_DefView",
IntPtr.Zero);
if (p != IntPtr.Zero)
{
// Gets the WorkerW Window after the current one.
workerw = W32.FindWindowEx(IntPtr.Zero,
tophandle,
"WorkerW",
IntPtr.Zero);
}
return(true);
}), IntPtr.Zero);
// We now have the handle of the WorkerW behind the desktop icons.
// We can use it to create a directx device to render 3d output to it,
// we can use the System.Drawing classes to directly draw onto it,
// and of course we can set it as the parent of a windows form.
//
// There is only one restriction. The window behind the desktop icons does
// NOT receive any user input. So if you want to capture mouse movement,
// it has to be done the LowLevel way (WH_MOUSE_LL, WH_KEYBOARD_LL).
#region
// Demo 1: Draw graphics between icons and wallpaper
// Get the Device Context of the WorkerW
IntPtr dc = W32.GetDCEx(workerw, IntPtr.Zero, (W32.DeviceContextValues) 0x403);
if (dc != IntPtr.Zero)
{
// Create a Graphics instance from the Device Context
using (Graphics g = Graphics.FromHdc(dc))
{
// Use the Graphics instance to draw a white rectangle in the upper
// left corner. In case you have more than one monitor think of the
// drawing area as a rectangle that spans across all monitors, and
// the 0,0 coordinate beeing in the upper left corner.
g.FillRectangle(new SolidBrush(Color.White), 0, 0, 500, 500);
}
// make sure to release the device context after use.
W32.ReleaseDC(workerw, dc);
}
#endregion
#region
// Demo 2: Demo 2: Put a Windows Form behind desktop icons
Form form = new Form();
form.Text = "Test Window";
form.Load += new EventHandler((s, e) =>
{
// Move the form right next to the in demo 1 drawn rectangle
form.Width = 500;
form.Height = 500;
form.Left = 500;
form.Top = 0;
#region
Button button = new Button()
{
Text = "Catch Me"
};
form.Controls.Add(button);
Random rnd = new Random();
System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();
timer.Interval = 100;
timer.Tick += new EventHandler((sender, eventArgs) =>
{
button.Left = rnd.Next(0, form.Width - button.Width);
button.Top = rnd.Next(0, form.Height - button.Height);
});
timer.Start();
#endregion
// Those two lines make the form a child of the WorkerW,
// thus putting it behind the desktop icons and out of reach
// for any user intput. The form will just be rendered, no
// keyboard or mouse input will reach it. You would have to use
// WH_KEYBOARD_LL and WH_MOUSE_LL hooks to capture mouse and
// keyboard input and redirect it to the windows form manually,
// but thats another story, to be told at a later time.
W32.SetParent(form.Handle, workerw);
});
// Start the Application Loop for the Form.
Application.Run(form);
#endregion
}
