API Monitor is a free software that lets you monitor and control API calls made by applications and services. Its a powerful tool for seeing how applications and services work or for tracking down problems that you have in your own applications.
64-bit Support - API Monitor supports monitoring of 64-bit applications and services. The 64-bit version can only be used to monitor 64-bit applications and 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. Note that the 64-bit installer for API Monitor includes both 64-bit and 32-bit versions.
Summary View with Syntax Highlighting - The Summary window displays information about the API call. This includes the Thread ID and the name of the DLL that made the API call, the syntax-highlighted API call with all parameters and the return value. If the API call fails, information about the error is also displayed.
13,000+ API Definitions, 1,300+ COM Interfaces - API Monitor comes with 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 to select API’s for monitoring.
API Monitor - 64bit software