Os X And Ctypes: How To Retrieve Raw Pixels From Cgdataprovidercopydata()?

I am trying to capture the screen using only the ctypes modules. Unfortunately I cannot retrieve raw pixel from CGDataProviderCopyData. I need to get an access to raw data: #!/usr/

Solution 1:

I have no experience with the CoreGraphics API, but looking at the documentation it looks like CGDataProviderCopyData returns a CFDataRef object. The documentat for CFDataRef has a section on "Examining a CFData Object" which describes a CFDataGetLength function and a CFDataGetBytePtr function which return the length of the data and a UInt8*.

https://developer.apple.com/library/ios/documentation/GraphicsImaging/Reference/CGDataProvider/#//apple_ref/c/func/CGDataProviderCopyData

https://developer.apple.com/library/ios/documentation/CoreFoundation/Reference/CFDataRef/index.html

Solution 2:

Thanks to Snorfalorpagus, I finally succeed:

#...
data = cgs.CGDataProviderCopyData(prov)
data_ref = cgs.CFDataGetBytePtr(data)
buf_len = cgs.CFDataGetLength()
image_data = cast(data_ref, POINTER(c_ubyte * buf_len))
cgs.CGDataProviderRelease(prov)

# Raw pixels are in image_data.contents