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;
}