Comments on: How to check whether the Pointer is allocated in Stack or Heap in Debug? http://weseetips.com/2008/12/14/how-to-check-whether-the-pointer-is-allocated-in-stack-or-heap-in-debug/ Gold mine of Visual C++ tricks! Thu, 11 Mar 2010 09:07:35 +0000 http://wordpress.org/?v=2.9.1 hourly 1 By: Jijo.Raj http://weseetips.com/2008/12/14/how-to-check-whether-the-pointer-is-allocated-in-stack-or-heap-in-debug/comment-page-1/#comment-235 Jijo.Raj Mon, 15 Dec 2008 07:29:58 +0000 http://weseetips.com/?p=702#comment-235 Wow! Thats Superb! Thanks a lot leochou, for sharing this tip. May be I'll update this to the tip with your name. ;) Well, Thanks once again and keep watching. Regards, Jijo. Wow! Thats Superb! Thanks a lot leochou, for sharing this tip. May be I’ll update this to the tip with your name. ;) Well, Thanks once again and keep watching.

Regards,
Jijo.

]]> By: leochou http://weseetips.com/2008/12/14/how-to-check-whether-the-pointer-is-allocated-in-stack-or-heap-in-debug/comment-page-1/#comment-234 leochou Mon, 15 Dec 2008 05:02:38 +0000 http://weseetips.com/?p=702#comment-234 great work! BTW, we can check whether a pointer points to stack or heap with the help of Thread Information Block in release version. bool IsMemoryOnStack( LPVOID pVoid ) { LPVOID dwStackTop = 0; LPVOID dwStackLowCurrent = 0; __asm { mov EAX, FS:[4] mov dwStackTop, eax mov EAX, FS:[8] mov dwStackLowCurrent, eax } if( pVoid = dwStackLowCurrent ) { // The memory lie between the stack top and stack commited. return true; } // Pointer dosen't point to the stack return false; } void main() { int OnStack; bool bOnStack = IsMemoryOnStack( &OnStack );// Returns true int *pOnHeap = new int; bOnStack = IsMemoryOnStack( pOnHeap );// Returns false } hope this be useful! great work!
BTW, we can check whether a pointer points to stack or heap with the help of Thread Information Block in release version.

bool IsMemoryOnStack( LPVOID pVoid )
{
LPVOID dwStackTop = 0;
LPVOID dwStackLowCurrent = 0;
__asm
{
mov EAX, FS:[4]
mov dwStackTop, eax
mov EAX, FS:[8]
mov dwStackLowCurrent, eax
}
if( pVoid = dwStackLowCurrent )
{
// The memory lie between the stack top and stack commited.
return true;
}
// Pointer dosen’t point to the stack
return false;
}

void main()
{
int OnStack;
bool bOnStack = IsMemoryOnStack( &OnStack );// Returns true
int *pOnHeap = new int;
bOnStack = IsMemoryOnStack( pOnHeap );// Returns false
}

hope this be useful!

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