I downloaded a zipped archive from Apple that consists of a C++ header file and source. Included in this was a help file. For some reason this help file opens but I cannot read the content. Is there any other documentation outside of a help file for this? For c++ or c#?
If you are on Windows, you probably are looking for the "iTunes COM for Windows SDK".
Get a free ADC login here if you haven't done so already. Once you have done that, you can go to http://connect.apple.com and log in.
Click on "Developer Tools", and somewhere in the massive list of results is "iTunes COM for Windows SDK". Download that, it's just an ordinary zip file, and somewhere in there is a directory named iTunesCOMWindowsSDK. In that directory, there is a iTunesCOM.chm file that contains all the reference material you need.
If this is the help file you already have, you could consider decompiling the chm file using the hh.exe tool that comes with Windows.
It seems the only source for the iTunes COM documentation is now archived on github by https://stackoverflow.com/users/188792/joshkunz
The nice web page is here
http://www.joshkunz.com/iTunesControl/
And the github project is here
Solved.. The problem was a Windows Security feature was blocking the compiled help file from opening. I found the solution here:
来源：https://stackoverflow.com/questions/2966992/where-is-itunes-sdk-api-documentation