VC利用FindWindow进程和消息间通信_vc 6 findwindoww-优快云博客

本文链接：https://blog.youkuaiyun.com/sqysqy123456/article/details/20705933

本文介绍了一个使用WM_COPYDATA消息进行进程间通信的例子，详细展示了如何构造和响应COPYDATASTRUCT结构体来实现不同消息类型的处理逻辑。

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COPYDATASTRUCT cpd;

CString m_szData = _T("hearbeat");
cpd.dwData = REGION_SERVER_PRO_ID;
cpd.cbData = m_szData.GetLength() + 1;//GetLength()只是取得实际字符的长度，没有包括'\0'.
cpd.lpData = (void*)m_szData.GetBuffer(cpd.cbData);
HWND hWndRcv = ::FindWindow(NULL,WATCHDOG_PRO_WINDOW_TITLE);
if(hWndRcv)

::SendMessage(hWndRcv,WM_COPYDATA,(WPARAM)this->m_hWnd,(LPARAM)&cpd);

响应WM_COPYDATA消息

BOOL CRegionMgrDlg::OnCopyData(CWnd* pWnd, COPYDATASTRUCT* pCopyDataStruct)
{
if((pCopyDataStruct->dwData&0xffff) == ALARM_QUERY_ID)
{
const char* szData = (const char*)pCopyDataStruct->lpData;
}
else if((pCopyDataStruct->dwData&0xffff) == WATCHDOG_PRO_ID)
{
if (strcmp((char*)pCopyDataStruct->lpData, "switchConsole")==0)//打开或半闭Console控制台消息
{
g_LogFile.switchCmdWindow();
}
else if (strcmp((char*)pCopyDataStruct->lpData, "exit")==0)//退出消息
{
g_WorkingState = FALSE;
// if(m_pMLsnThread == NULL)
// {
// if(sockMsgSrv != SOCKET_ERROR)///有效SOCKET要先关闭
// MyCloseSocket(sockMsgSrv);
//
// TerminateThread(m_pMLsnThread->m_hThread,0);
// }
// SetTimer(104, 100, NULL);//开启定时器，检查所有数据是否处理完毕
//CDialog::OnClose();
exit(0);
}
else
{
;
}
}
else if((pCopyDataStruct->dwData&0xffff) == REGION_SERVER_PRO_ID) //为本程序的消息
{
if (strcmp((char*)pCopyDataStruct->lpData, "restart")==0)//重启消息
{
COPYDATASTRUCT cpd;
CString m_szData = _T("restart");
cpd.dwData = REGION_SERVER_PRO_ID;
cpd.cbData = m_szData.GetLength() + 1;//GetLength()只是取得实际字符的长度，没有包括'\0'.
cpd.lpData = (void*)m_szData.GetBuffer(cpd.cbData);
HWND hWndRcv = ::FindWindow(NULL,WATCHDOG_PRO_WINDOW_TITLE);
if(hWndRcv)
::SendMessage(hWndRcv,WM_COPYDATA,(WPARAM)this->m_hWnd,(LPARAM)&cpd);
else
StartWatchDog();
}
}
else
{
;
}
return CDialog::OnCopyData(pWnd, pCopyDataStruct);
}