Subclassing and Hooking with Visual Basic

Name

PostThreadMessage

Synopsis

This function uses the actual thread ID to determine which message queue is to receive the message. This function also does not wait for a response to the posted message. This function is defined as follows:

Public Declare Function PostThreadMessage Lib "user32" _
         Alias "PostThreadMessageA" _
		(ByVal idThread As Long, ByVal msg As Long, _
		ByVal wParam As Long, ByVal lParam As Long) As Long

Parameters

idThread

The thread identifier that the message is posted to. You can determine this value using the Visual Basic App.ThreadID method, or by using either of the GetCurrentThreadID or GetWindowThreadProcessId API functions.

uMsg

The message identifier.

lParam

The second parameter of the message.

wParam

The first parameter of the message.

Return Value

The return value is nonzero if the function succeeded in posting the message; otherwise, returns a zero value.