Is there a way for an application on a 64-bit version of Windows to execute code under both the 64-bit and 32-bit emulation levels?

Question

I am wondering if I can write an application that can call some code without an emulation layer and some code inside a 32-bit emulation level.

The main reason is that I will need to use the SetWindowHook API, and I want to set the binding for both 64-bit and 32-bit applications.

Of course, I can create 2 applications (one for 32 bits and another for 64 bits) and run them simultaneously. However, I will need more code to control them (start, stop, update, etc.).

So, I look, is it even possible to have one application.

The only idea I have is to have one application and 2 COM-DLLs (32 bits and 64 bits) and use a surrogate process to run 32 bit code. However, this will require additional COM wrappers, etc.

Answer 1

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Answer 4

I think your only hope is to do this through something like COM outside the process, because each process should be all 32 bits or all 64 bits.