C# Signature:

[DllImport("User32.Dll", EntryPoint = "PostMessageA")]
public static extern bool PostMessage(IntPtr hWnd, uint msg, int wParam, int lParam);

VB Signature:

Declare Function PostMessageA Lib "user32.dll" (TODO) As TODO

User-Defined Types:

None.

Alternative Managed API:

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Notes:

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Tips & Tricks:

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Sample Code:

public const uint WM_KEYDOWN = 0x100;

// get the handle of window
var hWnd = IntPtr.Zero; //use FindWindowEx etc...

// send few messages to the window
PostMessage(hWnd,  WM_KEYDOWN, VkKeyScan('h'), 0);
PostMessage(hWnd,  WM_KEYDOWN, VkKeyScan('e'), 0);
PostMessage(hWnd,  WM_KEYDOWN, VkKeyScan('l'), 0);
PostMessage(hWnd,  WM_KEYDOWN, VkKeyScan('l'), 0);
PostMessage(hWnd,  WM_KEYDOWN, VkKeyScan('o'), 0);

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