C / C++ / MFC

MFC:
void CMXAutoDlg::SendStringToWnd ( CWnd * pWnd , CString sString )
{

	pWnd->SetForegroundWindow() ;
	pWnd->SetFocus();
	pWnd->CenterWindow ( ) ;

	
	for ( int iCounter = 0 ; iCounter < sString.GetLength ( ) ; iCounter ++)
	{
		pWnd->PostMessage ( WM_CHAR, sString [ iCounter ] , 0 );
		Sleep ( 100 );

	}
}
Non MFC:
PostMessage(hWnd , ...) same params

BOOL GetMessage(
  LPMSG lpMsg,         // message information
  HWND hWnd,           // handle to window
  UINT wMsgFilterMin,  // first message
  UINT wMsgFilterMax   // last message
);

 <br />
   ...<br />
   	MSG msg;<br />
	while(::GetMessage(&msg, NULL, 0,0))<br />
	{<br />
		switch(msg.message)<br />
		{<br />
		case WM_RXD_ARRIVAL:<br />
			AfxMessageBox(msg.lParam);<br />
			break;<br />
		default:<br />
			break;<br />
<br />
		};<br />
	};<br />
   ...<br />

MSG msg;
while(::GetMessage(&msg, NULL, 0,0))
{
  switch(msg.message)
  {
   case WM_RXD_ARRIVAL:
     // cast them
     BYTE* m_pByte = (BYTE *) msg.wParam; 
     int m_nLen = (int) msg.lParam;

     break;

   default:
     break;
  }
}

#pragma message("this is just how to do it")

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"When the only tool you have is a hammer, a sore thumb you will have."