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Debug Hook Function Writing

This section describes a number of custom debug hook functions you can write that allow you to insert your code into some predefined points inside the debugger's normal processing.

In This Section

  • Client Block Hook Functions
    Provides guidance and a prototype for writing functions that validate or report the contents of the data stored in _CLIENT_BLOCK blocks.

  • Allocation Hook Functions
    Defines an allocation hook function, explores its different uses, points out restrictions, and provides a prototype.

  • Allocation Hooks and CRT Memory Allocations
    Describes the restriction on allocation hook functions of explicitly ignoring _CRT_BLOCK blocks if they make any calls to C run-time library functions that allocate internal memory. This topic also lists the consequences if your allocation hook does not ignore _CRT_BLOCK blocks (with examples) and how to change the default allocation hook function, CrtDefaultAllocHook.

  • Report Hook Functions
    Discusses _CrtSetReportHook, which you can use to filter reports to focus on specific types of allocations. This topic also provides a prototype.

  • CRT Debugging Techniques
    Links to debugging techniques for the C Run-Time Library, including using the CRT Debug Library, macros for reporting, differences between malloc and _malloc_dbg, writing debug hook functions, and the CRT debug heap.