VC利用管道读取EXE返回值

最新推荐文章于 2021-09-16 20:00:28 发布

itjobtxq

最新推荐文章于 2021-09-16 20:00:28 发布

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分类专栏： C++

本文链接：https://blog.youkuaiyun.com/itjobtxq/article/details/9309819

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该代码示例展示了如何通过管道（pipe）来读取一个由VC编译的EXE程序的输出，实现进程间通信。创建管道，设置启动信息以重定向程序的标准输出和错误到管道，然后启动进程并读取其输出，直到程序结束。

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BOOL Run(const char *command, char *pOut, int nCount)
{
    SECURITY_ATTRIBUTES sa;
    HANDLE hRead = NULL, hWrite = NULL;

    sa.nLength = sizeof(SECURITY_ATTRIBUTES);
    sa.lpSecurityDescriptor = NULL;
    sa.bInheritHandle = TRUE;
    if (!CreatePipe(&hRead, &hWrite, &sa, 0))
    {
        return FALSE;
    }

    STARTUPINFOA si;
    PROCESS_INFORMATION pi;
    si.cb = sizeof(STARTUPINFOW);
    GetStartupInfoA(&si);
    si.hStdError = hWrite;
    si.hStdOutput = hWrite;
    si.wShowWindow = SW_HIDE;
    si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
    if (!CreateProcessA(NULL, (char *)command, NULL, NULL, TRUE, NULL, NULL, NULL, &si, &pi))
    {
       CloseHandle(hWrite);
       CloseHandle(hRead);
        return FALSE;
    }

   CloseHandle(hWrite);

   char szBuffer[5 * 1024] = {0};
    DWORD dwReaded;
   DWORD dwExitCode;
   char *pTempOut = pOut;
   while (GetExitCodeProcess(pi.hProcess, &dwExitCode))
   {
       if (dwExitCode != STILL_ACTIVE)
       {
           break;
       }

       memset(szBuffer, 0, sizeof(szBuffer));
       if (!ReadFile(hRead, szBuffer, sizeof(szBuffer) - 1, &dwReaded, NULL))
       {
           break;
       }

       memcpy(pTempOut, szBuffer, dwReaded);
       pTempOut += dwReaded;
   }

   WaitForSingleObject(pi.hProcess, INFINITE);
   CloseHandle(hRead);
   CloseHandle(pi.hProcess);
   CloseHandle(pi.hThread);

   return TRUE;
}