Instead of using a complicated Sendmessge between processes, there is another convenient way to communicate between processes. Pipe!

There is a good tutorial and implementation demo with C#. link

I just used the server client in my program. But for the client, I used a simple C++ implementation.

HANDLE h=NULL;
void send_message(char *msg)
{
	if (!h)
		{
			h=CreateFile(L"\\\\.\\pipe\\MyNamedPip",
			      GENERIC_READ | GENERIC_WRITE,
                  0,
                  NULL,
                  OPEN_EXISTING,
                  FILE_FLAG_OVERLAPPED,
				  NULL);
		}

	DWORD BytesWritten;
	WriteFile(h,msg,strlen(msg),&BytesWritten,NULL);
	FlushFileBuffers(h);
}

Tags: C#, VC++.net, Win32

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