Calculate hash of an Image?

[stampede]

how do i convet the image say a Qimage to QByteArray?

QImage has constBits() method that returns the pixel data, you can use it to construct the QByteArray, which you can pass to QCrypthographicHash.

Is there any thing similar available in c++?

C++ is a programming language, it has no built-in support for image processing.

[mnutt]

If you're just comparing images, QImage::cacheKey may be what you're looking for.