API Monitor is an application that monitors and displays API calls made by applications. Its a powerful tool for seeing how Windows and other applications work or tracking down problems that you have in your own applications. API Monitor supports monitoring of 64-bit applications and services. The 64-bit version can only be used to monitor 64-bit applications while the 32-bit version can be only be used to monitor 32-bit applications. To monitor a 32-bit application on 64-bit Windows, you must use the 32-bit version. However, it is important to note that the 64-bit installer for API Monitor includes both 64-bit and 32-bit versions.

API Monitor features API Definitions for over 13,000 API’s from almost 200 DLL’s and over 17,000 methods from 1,300+ COM Interfaces (Shell, Web Browser, DirectShow, DirectSound, DirectX, Direct2D, DirectWrite, Windows Imaging Component, Debugger Engine, MAPI etc). API’s are organized into categories and sub-categories (as specified in MSDN). The API Capture filter enables you to select API’s for monitoring. The application can also decode and display 2000 different structures and unions, 1000+ Enumerated data types, 800+ flags. Buffers and arrays within structures can also be viewed. API Monitor lets you control the target application by setting breakpoints on API calls.

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