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.


Features
  • 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.a

Structures, Unions, Enums and Flags
API Monitor can decode and display 2000 different structures and unions, 1000+ Enumerated data types, 800+ flags. Buffers and arrays within structures can also be viewed.

Buffer View
API Monitor can display both input and output buffers. The amount of data displayed is automatically calculated from other arguments to the API or from the API return value. The maximum amount of data to be captured is configurable. The following screenshot shows the buffer after a ReadFile API call. The length lpBuffer is calculated by looking at the value of lpNumberOfBytesRead after the API call has executed. In this case, the value returned was 174 and that is the length of the buffer displayed.

Call Tree
API Monitor displays a call tree which shows the hierarchy of API calls. The following screenshot displays a call tree for a CoGetClassObject call made by a Visual Basic application that loads the Microsoft Winsock ActiveX control. The ActiveX control MSWINSCK.OCX makes calls to WSAStartup and CreateWindowExA from DllMain.

Process Memory Editor
API Monitor includes a memory editor that lets you view, edit and allocate memory in any process. The memory editor also allows you to change the protection of memory regions. During a breakpoint, the memory editor can be used to view and modify buffers in the target process. Right-click on any process or service in the Running Process window to launch the memory editor.


Requirements

Windows 2000, Windows XP 32-bit, Windows XP 64-bit x64, Windows Vista 32-bit, Windows Vista 64-bit x64, Windows 7 32-bit, Windows 7 64-bit x64, Windows 8 32-bit, Windows 8 64-bit x64

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