[DllImport("user32.dll", SetLastError = true)]
static extern bool PostMessage(IntPtr hWnd, uint Msg,
IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll")]
static extern bool PostThreadMessage(uint idThread, uint Msg,
UIntPtr wParam, IntPtr lParam);
[DllImport("user32.dll", SetLastError=true, CharSet=CharSet.Auto)]
static extern bool SendMessageCallback(IntPtr hWnd, uint Msg,
UIntPtr wParam, IntPtr lParam,
SendMessageDelegate lpCallBack, UIntPtr dwData);
[DllImport("user32.dll", SetLastError=true, CharSet=CharSet.Auto)]
static extern bool SendNotifyMessage(IntPtr hWnd, uint Msg,
UIntPtr wParam, IntPtr lParam);
SendMessage() – Sends the specified message to a window or windows, calls the window procedure for the specified window and does not return until the window procedure has processed the message.
PostMessage() – Posts a message in the message queue associated with the thread that created the specified window and returns without waiting for the thread to process the message.
PostThreadMessage() – Posts a message to the message queue of the specified thread. It returns without waiting for the thread to process the message.
SendNotifyMessage() – Sends the specified message to a window or windows. If the window was created by the calling thread, SendNotifyMessage calls the window procedure for the window and does not return until the window procedure has processed the message. If the window was created by a different thread, SendNotifyMessage passes the message to the window procedure and returns immediately; it does not wait for the window procedure to finish processing the message.
SendMessageCallback() – Calls the window procedure for the specified window and returns immediately. After the window procedure processes the message, the system calls the specified callback function, passing the result of the message processing and an application-defined value to the callback function.
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