如何在Qt中将QPixmap转换为base64 QString？

Question

我将QT 5.7用于必须将QPixmap转换为base64 QString格式的程序。我试图先将QPixmap转换为cv :: Mat，然后添加我现有的转换流程。

$: x="
    this
    is
       variably indented
    stuff
   "
$: echo "$x" # preserves the newlines and spacing

    this
    is
       variably indented
    stuff

$: echo $x # no quotes, stacks it "neatly" with minimal spacing
this is variably indented stuff

但是它返回错误：

Qpixmap pix;
cv::Mat pixData(pix.rows(),pix.cols(),CV_8UC3,pix.scanline());
                std::vector<uchar> IMbuffer;
                cv::imencode(".png", pixData, IMbuffer);
     QByteArray byteArray = QByteArray::fromRawData((const char*)IMbuffer.data(), IMbuffer.size());
                QString base64Image(byteArray.toBase64());

因此很明显，从QPixmap到cv :: Mat的这种转换是不兼容的。那么，有什么简单的方法可以将QPixmap转换为base64 QString？

Answer 1

尝试一下；

 QBuffer buffer;
 buffer.open(QIODevice::WriteOnly);
 pix.save(&buffer, "PNG");
 auto const encoded = buffer.data().toBase64();