c++ 消息传递（通过SendMessage）

//同一进程间传递

char * msg = "ttbb" ;

:: SendMessage ( hwnd , Thread_Msg_Student , 0 ,( LPARAM ) msg );

//不同进程间,传递字符串通过copydata的方式

//发一定注意发送的结构

tagCOPYDATASTRUCT netDataPacket;
netDataPacket.dwData = 0;
	netDataPacket.cbData =strlen(strInfo)+1;
		netDataPacket.lpData = strInfo;
	::SendMessage(hwnd,WM_COPYDATA,0,(LPARAM)&netDataPacket);
//接
BOOL CStudentNetProxyDlg::OnCopyData(CWnd*, COPYDATASTRUCT*netData)
{

	if(netData->lpData)												  
	{
		char  * pp=(char *)netData->lpData;
 		CStringA strMsg;
		strMsg.Format(pp);
 		

		return TRUE;
	}



	return FALSE;
}