Using C++ REST SDK as a static library

cpprestsdk is a handy library for implementing REST interfaces in C++ code. On Windows it is conveniently available as a NuGet package. However, it is a dynamic link library (DLL). Normally that’s not a problem except for the fact that I am trying to combine it with WebRTC which builds as a static library and mixing the two causes strange crashes. I don’t know if it is possible to compile WebRTC as a DLL – the ninja build is very complicated :-(.

I found this very helpful post which provides life-saving instructions on how to build and use cpprestsdk as a static linked library. In fact the cpprestsdk Visual Studio solution now includes a project to build a static library so that part is mostly taken care of. It is still necessary to change the Runtime Library option to /MTd (debug) and /MT (release) in the casablanca140.static project however.

To use the library, the preprocessor symbol _NO_ASYNCRTIMP needs to be defined in the project as described in the post. You also have to add winhttp.lib, crypt32.lib, bcrypt.lib and zlibstatic.lib as additional linker dependencies. The library for the latter needs to copied somewhere that the project can find – it can be obtained from the packages in the cpprestsdk folder for zlib.

Another thing is that the static version of cpprestsdk needs to be built in Debug and Release modes if the new project is to run in both modes. With some things you can use Release for both – this doesn’t seem to work for cpprestsdk.

The result now is that I can use REST for signaling in my WebRTC project – not as easy as I expected!

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