_CrtSetReportHook2, _CrtSetReportHookW2
Installs or uninstalls a client-defined reporting function by hooking it into the C run-time debug reporting process (debug version only).
int _CrtSetReportHook2(
int mode,
_CRT_REPORT_HOOK pfnNewHook
);
int _CrtSetReportHookW2(
int mode,
_CRT_REPORT_HOOKW pfnNewHook
);
Parameters
mode
The action to take: _CRT_RPTHOOK_INSTALL or _CRT_RPTHOOK_REMOVE.pfnNewHook
Report hook to install or remove in the narrow-character version of this function.pfnNewHook
Report hook to install or remove in the wide-character version of this function.
Return Value
-1 if an error was encountered, with EINVAL or ENOMEM set; otherwise returns the reference count of pfnNewHook after the call.
Remarks
_CrtSetReportHook2 and _CrtSetReportHookW2 let you hook or unhook a function, whereas _CrtSetReportHook only lets you hook a function.
_CrtSetReportHook2 or _CrtSetReportHookW2 should be used instead of _CrtSetReportHook when the hook call is made in a DLL and when multiple DLLs might be loaded and setting their own hook functions. In such a situation, DLLs can be unloaded in a different order than they were loaded and the hook function can be left pointing at an unloaded DLL. Any debug output crashes the process if the hook functions were added with _CrtSetReportHook.
Any hook functions added with _CrtSetReportHook are called if there are no hook functions added with _CrtSetReportHook2 or _CrtSetReportHookW2 or if all hook functions added with _CrtSetReportHook2 and _CrtSetReportHookW2 return FALSE.
The wide-character version of this function is available in Visual C++ 2005. The report hook functions take a string whose type (wide or narrow characters) must match the version of this function used. Use the following function prototype for the report hooks used with the wide-character version of this function:
int YourReportHook( int reportType, wchar_t *message, int *returnValue );
Use the following prototype for the narrow-character report hooks:
int YourReportHook( int reportType, char *message, int *returnValue );
These functions validate their parameters. If mode or pfnNewNook is invalid, these functions invoke the invalid parameter handler, as described in Parameter Validation. If execution is allowed to continue, these functions set errno to EINVAL and return -1.
Note
If your application is compiled with /clr and the reporting function is called after the application has exited main, the CLR will throw an exception if the reporting function calls any CRT functions.
Requirements
Routine |
Required header |
Optional header |
|---|---|---|
_CrtSetReportHook2 |
<crtdbg.h> |
<errno.h> |
_CrtSetReportHookW2 |
<crtdbg.h> |
<errno.h> |
For more compatibility information, see Compatibility in the Introduction.
Libraries
Debug versions of C run-time libraries only.
Example
// crt_setreporthook2.c
#include <windows.h>
#include <stdio.h>
#include <crtdbg.h>
#include <assert.h>
int __cdecl TestHook1(int nReportType, char* szMsg, int* pnRet)
{
int nRet = FALSE;
printf("CRT report hook 1.\n");
printf("CRT report type is \"");
switch (nReportType)
{
case _CRT_ASSERT:
{
printf("_CRT_ASSERT");
// nRet = TRUE; // Always stop for this type of report
break;
}
case _CRT_WARN:
{
printf("_CRT_WARN");
break;
}
case _CRT_ERROR:
{
printf("_CRT_ERROR");
break;
}
default:
{
printf("???Unknown???");
break;
}
}
printf("\".\nCRT report message is:\n\t");
printf(szMsg);
if (pnRet)
*pnRet = 0;
return nRet;
}
int __cdecl TestHook2(int nReportType, char* szMsg, int* pnRet)
{
int nRet = FALSE;
printf("CRT report hook 2.\n");
printf("CRT report type is \"");
switch (nReportType)
{
case _CRT_WARN:
{
printf("_CRT_WARN");
break;
}
case _CRT_ERROR:
{
printf("_CRT_ERROR");
break;
}
case _CRT_ASSERT:
{
printf("_CRT_ASSERT");
nRet = TRUE; // Always stop for this type of report
break;
}
default:
{
printf("???Unknown???");
break;
}
}
printf("\".\nCRT report message is: \t");
printf(szMsg);
if (pnRet)
*pnRet = 0;
// printf("CRT report code is %d.\n", *pnRet);
return nRet;
}
int main(int argc, char* argv[])
{
int nRet = 0;
nRet = _CrtSetReportHook2(_CRT_RPTHOOK_INSTALL, TestHook1);
printf("_CrtSetReportHook2(_CRT_RPTHOOK_INSTALL, TestHook1)"
" returned %d\n", nRet);
nRet = _CrtSetReportHook2(_CRT_RPTHOOK_INSTALL, TestHook2);
printf("_CrtSetReportHook2(_CRT_RPTHOOK_INSTALL, TestHook2)"
" returned %d\n", nRet);
nRet = _CrtSetReportHook2(_CRT_RPTHOOK_INSTALL, TestHook2);
printf("_CrtSetReportHook2(_CRT_RPTHOOK_INSTALL, TestHook2)"
" returned %d\n", nRet);
nRet = _CrtSetReportHook2(_CRT_RPTHOOK_REMOVE, TestHook1);
printf("_CrtSetReportHook2(_CRT_RPTHOOK_REMOVE, TestHook1)"
" returned %d\n", nRet);
nRet = _CrtSetReportHook2(_CRT_RPTHOOK_INSTALL, TestHook1);
printf("_CrtSetReportHook2(_CRT_RPTHOOK_INSTALL, TestHook1)"
" returned %d\n", nRet);
_ASSERT(0);
nRet = _CrtSetReportHook2(_CRT_RPTHOOK_REMOVE, TestHook2);
printf("_CrtSetReportHook2(_CRT_RPTHOOK_REMOVE, TestHook2)"
" returned %d\n", nRet);
nRet = _CrtSetReportHook2(_CRT_RPTHOOK_REMOVE, TestHook2);
printf("_CrtSetReportHook2(_CRT_RPTHOOK_REMOVE, TestHook2)"
" returned %d\n", nRet);
nRet = _CrtSetReportHook2(_CRT_RPTHOOK_REMOVE, TestHook2);
printf("_CrtSetReportHook2(_CRT_RPTHOOK_REMOVE, TestHook2)"
" returned %d\n", nRet);
nRet = _CrtSetReportHook2(_CRT_RPTHOOK_REMOVE, TestHook1);
printf("_CrtSetReportHook2(_CRT_RPTHOOK_REMOVE, TestHook1)"
" returned %d\n", nRet);
return nRet;
}
Output
_CrtSetReportHook2(_CRT_RPTHOOK_INSTALL, TestHook1) returned 0
_CrtSetReportHook2(_CRT_RPTHOOK_INSTALL, TestHook2) returned 0
_CrtSetReportHook2(_CRT_RPTHOOK_INSTALL, TestHook2) returned 0
_CrtSetReportHook2(_CRT_RPTHOOK_REMOVE, TestHook1) returned 0
_CrtSetReportHook2(_CRT_RPTHOOK_INSTALL, TestHook1) returned 0
_CrtSetReportHook2(_CRT_RPTHOOK_REMOVE, TestHook2) returned 0
_CrtSetReportHook2(_CRT_RPTHOOK_REMOVE, TestHook2) returned 0
_CrtSetReportHook2(_CRT_RPTHOOK_REMOVE, TestHook2) returned 0
_CrtSetReportHook2(_CRT_RPTHOOK_REMOVE, TestHook1) returned 0