CreateProcess将运行结果写入文件

最新推荐文章于 2023-05-16 14:11:37 发布

原创最新推荐文章于 2023-05-16 14:11:37 发布 · 603 阅读

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本文详细介绍了如何使用C++通过CreateProcess函数创建子进程，并利用CreateFile函数重定向子进程的标准输入、输出和错误到指定文件。示例中展示了如何将ping命令的输入和输出分别连接到input.txt和output.txt文件。

PROCESS_INFORMATION pi;
   STARTUPINFO si = { sizeof(STARTUPINFO) };
   SECURITY_ATTRIBUTES sa = { sizeof(SECURITY_ATTRIBUTES),NULL,TRUE };
   HANDLE cmdOutput = CreateFile("./output.txt",
       GENERIC_WRITE,
       FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
       &sa, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
   if (cmdOutput == INVALID_HANDLE_VALUE)
   {
       ExitProcess(0);
   }
   SetFilePointer(cmdOutput, 0, 0, FILE_END); //CreateFile文件追加写入
   HANDLE cmdInput = CreateFile("./input.txt",
       GENERIC_READ,
       FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
       &sa, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
   if (cmdInput == INVALID_HANDLE_VALUE)
   {
       ExitProcess(0);
   }

   si.hStdInput = cmdInput;
   si.hStdOutput = cmdOutput;
   si.dwFlags = STARTF_USESTDHANDLES;
   std::string cmdstr = "ping 8.8.8.8";
   LPSTR lpszCmdLine = (LPSTR)cmdstr.c_str();
   if (CreateProcess(NULL, lpszCmdLine, NULL, NULL, TRUE, NULL, NULL, NULL, &si, &pi))
   {
       WaitForSingleObject(pi.hProcess, INFINITE);
       CloseHandle(pi.hProcess);
       CloseHandle(pi.hThread);
   }

CloseHandle(cmdOutput);
CloseHandle(cmdInput);