The plugin works well in paint.net, but I tried in my app and got InvalidFile

[0xc0000054]

The plugin works well in paint.net, but I tried in my app and got InvalidFile

[0xC0000054]

My only guess is that you may need to seek to the beginning of the file before calling loadFileIntoContext.

[sati32]

Thank you for your help. But this is not the solution. My file callbacks are called GetPosition and returns 0, GetSize and Read (4 Bytes and gives the first 4 Bytes of the file).
I will try to check the source of LibHeic.

[sati32]

OK, the problem was my Read-Callback function. It has to return "0" for no error, not the amount of bytes read, as expected.

[sati32]

Works fine now.
May I ask if there is a way to get 16 bit per channel instead of 8?
Is there a way to get data without alpha or is there a way to detect if alpha is present?

[0xC0000054]

You would have to modify the C++ wrapper code to add those features.

Paint.NET uses 8-bit RGBA as its native image format, so the C++ wrapper code used by this plugin only supports that format.
There was no point in adding features to the wrapper that Paint.NET does not support.