QProcess 输出未显示 [英] QProcess output not showing

问题描述

我有一些 C++ 代码使用 Qt 的 QProcess 在 Linux 中运行 scp 命令，但我从未从进程中获得任何输出:

I have some C++ code that uses Qt's QProcess to run an scp command in Linux, but I never get any output from the process:

void CopyClass::CopyClass()
{ 
    mpScpProcess = new QProcess(this);
    connect(mpScpProcess, SIGNAL(finished(int)),  this, SLOT(onCopyFinished(int)));
    connect(mpScpProcess, SIGNAL(readyReadStandardOutput()), this, SLOT(onReadCopyOutput()));
}

void CopyClass::startScp()
{
    mpScpProcess->setProcessChannelMode(QProcess::MergedChannels); 
    mpScpProcess->start("scp 192.168.1.100:/file.txt ./");
}

void CopyClass::onCopyFinished(int val)
{
    qWarning("Copy Finished");
}

void CopyClass::onReadCopyOutput()
{
    QString output = mpScpProcess->readAll().data();

    qWarning("Output: %s", qPrintable(output));
}

onCopyFinished 被调用，并且 scp 复制成功，但没有输出输出(从不调用 onReadCopyOutput).但我知道它应该输出如下内容:

onCopyFinished gets called, and the scp copy succeeds, but no output ever comes out (onReadCopyOutput is never called). But I know it should output something like this:

file.txt                                     100%  1KB   1.9MB/s   00:00

有人知道为什么它不起作用吗?谢谢.

Anyone know why it's not working? Thanks.

推荐答案

scp 在其标准输出被重定向到管道时不生成输出:

scp does not generate output when its standard output is being redirected to a pipe:

scp src dest > out.txt

您会看到 out.txt 是空的.我认为您对此无能为力.

You'll see that out.txt is empty. I don't think there's much you can do about it.

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