_CrtMemCheckpoint

Article
11/16/2012

Obtains the current state of the debug heap and stores in an application-supplied _CrtMemState structure (debug version only).

void _CrtMemCheckpoint(
   _CrtMemState *state 
);

Parameters

state
Pointer to _CrtMemState structure to fill with the memory checkpoint.

Remarks

The _CrtMemCheckpoint function creates a snapshot of the current state of the debug heap at any given moment. This snapshot can be used by other heap state functions such as _CrtMemCheckpoint to help detect memory leaks and other problems. When _DEBUG is not defined, calls to _CrtMemState are removed during preprocessing.

The application must pass a pointer to a previously allocated instance of the _CrtMemState structure, defined in Crtdbg.h, in the state parameter. If _CrtMemCheckpoint encounters an error during the checkpoint creation, the function generates a _CRT_WARN debug report describing the problem.

For more information about heap state functions and the _CrtMemState structure, see Heap State Reporting Functions. For more information about how memory blocks are allocated, initialized, and managed in the debug version of the base heap, see Memory Management and the Debug Heap.

If state is NULL, the invalid parameter handler is invoked, as described in Parameter Validation. If execution is allowed to continue, errno, _doserrno, _sys_errlist, and _sys_nerr is set to EINVAL and the function returns.

Requirements

Routine	Required header
_CrtMemCheckpoint	<crtdbg.h>, <errno.h>

For more compatibility information, see Compatibility in the Introduction.

Libraries: Debug versions of C Run-Time Libraries only.

Example

See crt_dbg1 Sample: C Run-Time Basic Debugging Features.

.NET Framework Equivalent

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

Change History

Date	History	Reason
May 2009	Added references to _CrtMemDifference.	Information enhancement.