创建子进程句柄继承问题

Question

    SECURITY_ATTRIBUTES sa;
    HANDLE hRead, hWrite;
    std::string result;
    sa.nLength = sizeof(SECURITY_ATTRIBUTES);
    sa.lpSecurityDescriptor = NULL;
    sa.bInheritHandle = FALSE;//TRUE;

    if (!CreatePipe(&hRead,&hWrite,&sa,0)) {
        cout << "创建管道失败!" << endl;
        return FALSE;
    }

    STARTUPINFO si = {0};
    si.cb = sizeof(si);
    si.dwFlags |= STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES; // 使用默认的IO句柄

    si.hStdOutput = hWrite;
    si.hStdError = hWrite;

    si.wShowWindow = SW_SHOWNORMAL; //  隐藏控制台窗口  
    PROCESS_INFORMATION pi = {0};  

    TCHAR para[100] = L"cmd.exe /c tree";

    if (!CreateProcess(NULL, para, NULL, NULL, TRUE, NULL, NULL, NULL, &si, &pi))  
    {  
        cout << "创建进程失败!" << endl;
        return FALSE;
    }

运行完CreateProcess之后出现提示:
Tree Walk Utility已停止工作

如果sa.bInheritHandle = TRUE, 就OK.

想请教个中原因, 不胜感激!

Answer 1

问题在于，当你设定sa.bInheritHandle = FALSE;之后，你又试图做

si.hStdOutput = hWrite;
si.hStdError = hWrite;