Qt5文件操作

1、打开文件对话框

void ImgProcessor::ShowOpenFile()
{
    fileName =QFileDialog::getOpenFileName(this);
    if(!fileName.isEmpty())
    {
        if(showWidget->text->document()->isEmpty())
        {
            loadFile(fileName);
        }
        else
        {
            ImgProcessor *newImgProcessor =new ImgProcessor;
            newImgProcessor->show();
            newImgProcessor->loadFile(fileName);
        }
    }
}

2、加载文件内容

void ImgProcessor::loadFile(QString filename)
{
    printf("file name:%s\n",filename.data());
    QFile file(filename);
    if(file.open(QIODevice::ReadOnly|QIODevice::Text))
    {
        QTextStream textStream(&file);
        while(!textStream.atEnd())
        {
            showWidget->text->append(textStream.readLine());
            printf("read line\n");
        }
        printf("end\n");
    }
}