用VC調用DOS命令來實現PING功能_VC

BOOL PingNetIP(CString szIp){ SECURITY_ATTRIBUTES   sa;  HANDLE   hRead,hWrite;  sa.nLength = sizeof(SECURITY_ATTRIBUTES);  sa.lpSecurityDescriptor   =   NULL;  sa.bInheritHandle   =   TRUE;  if (!CreatePipe(&hRead,&hWrite,&sa,0)) {  return FALSE;  }    STARTUPINFO si;  PROCESS_INFORMATION pi;    si.cb = sizeof(STARTUPINFO);  GetStartupInfo(&si);    si.hStdError = hWrite;  si.hStdOutput = hWrite;  si.wShowWindow = SW_HIDE;  si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;  CString pIP;pIP.Format("ping -n 1 %s", szIp);if (!CreateProcess(NULL, pIP.GetBuffer(0), NULL, NULL, TRUE, NULL, NULL, NULL, &si, &pi))  {return FALSE;  }  CloseHandle(hWrite);  char buffer[4096] = "";char *pBuffer = buffer;DWORD bytesRead;    while(1)   {  if (ReadFile(hRead, pBuffer, 4095, &bytesRead,NULL)   ==   NULL)  break;  pBuffer += bytesRead;Sleep(200);    }    CString cResult(buffer);if (cResult.Find("請求逾時") != -1 || cResult.Find("無法訪問目標主機") != -1){return FALSE;}return TRUE;