Win32 API Hook examples, case notes are very detailed, very easy to understand. In this case realized MessageBox function Hook, of course, you can Hook the other API, only a small change can be.

HookMessageBoxA\Debug\HookMessageBoxA.exe
...............\.....\HookMessageBoxA.ilk
...............\.....\HookMessageBoxA.obj
...............\.....\HookMessageBoxA.pch
...............\.....\HookMessageBoxA.pdb
...............\.....\StdAfx.obj
...............\.....\vc60.idb
...............\.....\vc60.pdb
...............\HookMessageBoxA.cpp
...............\HookMessageBoxA.dsp
...............\HookMessageBoxA.dsw
...............\HookMessageBoxA.ncb
...............\HookMessageBoxA.opt
...............\HookMessageBoxA.plg
...............\ReadMe.txt
...............\StdAfx.cpp
...............\StdAfx.h
...............\Debug
HookMessageBoxA

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