QT QFileDialog文件选择对话框

选择txt或者cpp文件，读取内容并显示

参考： 

QT写入文件与读取文件内容_qt往一个文件写东西-CSDN博客

#include "QtFilePreview.h"
#include "qfiledialog.h"
#include "qfile.h"
#include "qtextstream.h"
#include "qfileinfo.h"

QtFilePreview::QtFilePreview(QWidget *parent)
    : QMainWindow(parent)
{
    ui.setupUi(this);
    ui.textEdit_preview->setReadOnly(true);
    ui.label_preview->setScaledContents(true);
    connect(ui.pushButton_open, &QPushButton::clicked, this, [=] {
        QString fileName = QFileDialog::getOpenFileName(this,tr("Open File"),"",tr("All Files(*.*)"));
        if (!fileName.isEmpty())
        {
            QFile file(fileName);
            if (file.open(QIODevice::ReadOnly | QIODevice::Text))
            {
                QTextStream in(&file);
                ui.textEdit_preview->setText(in.readAll());
                file.close();

                QFileInfo fileInfo(fileName);
                QPixmap pixmap(fileInfo.absolutePath());
                ui.label_preview->setPixmap(pixmap.scaled(ui.label_preview->size(),Qt::KeepAspectRatio,Qt::SmoothTransformation ));


            }
        }

        });
}

QtFilePreview::~QtFilePreview()
{}