C/C++ 獲取命令行返回信息

 

 

std::string GetCmdInfo(const char * pszCmd)
{
    //創建匿名管道
    SECURITY_ATTRIBUTES sa = {sizeof(SECURITY_ATTRIBUTES), NULL, TRUE};
    HANDLE hRead, hWrite;
    if (!CreatePipe(&hRead, &hWrite, &sa, 0))
    {
        return "";
    }

    //設置命令行進程啓動信息(以隱藏方式啓動命令並定位其輸出到hWrite)
    STARTUPINFO si = {sizeof(STARTUPINFO)};
    GetStartupInfo(&si);
    si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
    si.wShowWindow = SW_HIDE;
    si.hStdError = hWrite;
    si.hStdOutput = hWrite;

    //啓動命令行
    PROCESS_INFORMATION pi;
    if (!CreateProcess(NULL, (char *)pszCmd, NULL, NULL, TRUE, NULL, NULL, NULL, &si, &pi))
    {
        return "";
    }

    //立即關閉hWrite
    CloseHandle(hWrite);

    //讀取命令行返回值
    std::string strRet;
    char buff[1024] = {0};
    DWORD dwRead = 0;
    while (ReadFile(hRead, buff, 1024, &dwRead, NULL))
    {
        strRet.append(buff, dwRead);
    }
    CloseHandle(hRead);

    return strRet;
}