Mriswithe wrote:
I was looking at making a little helper app for Windows that will take an image on your clipboard and ensure it is under 8MB for posting to discord, and if it isn't, use Pillow to resize it until it is the right size.I can use Pillow's ImageGrab.grabclipboard() to get the image off the clipboard, but I am a little confused about writing it back. I have been back and forth between the pywin32 source and the windows docs for the windows C API, but I don't have any previous experience or context to know what some pieces are intended to do.I found an example to write to it from StackOverflow (https://stackoverflow.com/questions/34322132/copy-image-to-clipboard <https://stackoverflow.com/questions/34322132/copy-image-to-clipboard>), but I was wanting to dig a little deeper to see what formats other than BMP I could use to put on the clipboard. My ignorance of C++ and the Windows APIs and hell the Python C API is really biting me here.
You can't. You have to write it as a DIB (Device Independent Bitmap), which is the format in a .BMP file.
The Windows clipboard was designed in roughly 1986, before GIF, before JPEG and way, way before PNG. The clipboard is designed for universal interchange, so it really does need to spec the lowest common denominator. If they allowed PNGs, then all of the graphics application in the world would have to be modified to decode PNG data.
So, to make your app work, save the result as a BMP.
Is there a bit of an idiots example guide for how to say, put a PNG on the clipboard or a JPG? Some example code? There is a ton of useful info in the pywin32 repo, but I haven't found anything that has made this click for me.
There is no idiots guide, because it cannot be done. Well, technically speaking you can put arbitrary binary data into the clipboard, but other graphics applications will not be able to read it. When they look for image data, they look for format CF_DIB, and that means a .BMP.
-- Tim Roberts, t...@probo.com Providenza & Boekelheide, Inc.
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