在不知道格式的情况下从字节数组加载QImage

Question

QImage has the following constructor:

QImage(const QString &fileName, const char *format = nullptr);

However, I am trying to parse JPEG/PNG images that are already loaded as byte array. QImage also has other constructors, but those take already uncompressed byte array of ARGB values.

Is there a way to create QImage from unparsed byte data instead of file?

Answer 1

You can construct an empty QImage and then later use QImage::loadFromData(const QByteArray&) without specifying a format. QImage will then try to read the image header to guess the file format.

QByteArray bytes; //contains image file contents
QImage img;
bool success = img.loadFromData(bytes);