Qt:显示、保存图片

    技术2022-05-20  58

    显示:

    QString g_strCurrentDir;QString strImage = QFileDialog::getOpenFileName(   this,    "请选择照片文件",   g_strCurrentDir,    "图像文件 (*.png *.jpg *.bmp *.gif)");if (strImage.isNull()){   return;}g_strCurrentDir = QDir(strImage).absolutePath();ui.labelPic->setPixmap(QPixmap(strImage).scaled(ui.labelPic->size()));

    保存图片到数据库中:

    QByteArray bytes;   QBuffer buffer(&bytes);   buffer.open(QIODevice::WriteOnly);   ui.labelPic->pixmap()->save(&buffer, "PNG");

       QSqlRecord record =model->record(7);   record.setValue("Picture",(QVariant)bytes);   model->setRecord(0,record);   model->submitAll();

    从数据库中读取图片:

    QSqlQuery q("SELECT Picture FROM User WHERE Id = 6");   if (q.next())   {    if (q.isNull(0) == false)    {     QPixmap photo;    photo.loadFromData(q.value(0).toByteArray(), "PNG");    ui.UserPicLabel->setPixmap(photo);    }   }

     

    本帖转自:http://hi.baidu.com/skyjsq/blog/item/bb3f7c188e2c9c0c35fa414a.html


    最新回复(0)