通过QTextStream流式传输到QTextEdit

Question

我经常想使用QTextEdit作为显示正在写入流的内容的快速方法.也就是说,我不想写QTextStream(stdout),而是想做类似的事情:

 QTextEdit qte; 
 QTextStream out(qte);  

如果我在写入附加到QString的QTextStream后发出信号,我可以做类似的事情.
问题是我希望界面与我流式传输时的界面相同stdout:

out << some data << endl;

关于如何实现这一目标的任何想法？

提前致谢.

Answer 1

您可以创建一个输出到QTextEdit的QIODevice.

class TextEditIoDevice : public QIODevice 
{
    Q_OBJECT

public:
    TextEditIoDevice(QTextEdit *const textEdit, QObject *const parent) 
        : QIODevice(parent)
        , textEdit(textEdit)
    {
        open(QIODevice::WriteOnly|QIODevice::Text);
    }

    //...

protected:
    qint64 readData(char *data, qint64 maxSize) { return 0; }
    qint64 writeData(const char *data, qint64 maxSize)
    {
        if(textEdit)
        {
            textEdit->append(data);
        }
        return maxSize;
    }

private:
    QPointer<QTextEdit> textEdit;
};


// In some dialogs constructor
QTextStream  ss(new TextEditIoDevice(*ui.textEdit, this));
ss <<  "Print formatted text " <<hex << 12 ;
// ...