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What is the other purpose of the .H header file and IDL file?

I am learning COM, so there are some basic questions puzzling me ...

I know that an IDL file is used to describe method definitions (or the so-called “contract” between program modules), and the .H header files contain something like a prototype method that looks like what IDL means for. So why do these two things coexist? Is it not enough?

Many thanks.

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An interface description language (IDL) is a small language per se that provides an interface description language independent of the programming language. Tools generate .h files from your .idl.

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