Hello,

I'm desperatly trying to switch on the low-fragmentation heap for the crt
heap in C++ in VS.NET 2003 on a Windows XP SP2 machine with the following
code:

ULONG HeapFragValue = 2;
int ret = HeapSetInformation((HANDLE)_get_heap_handle(),
HeapCompatibilityInformation, &HeapFragValue, sizeof(HeapFragValue));

It always returns 0 which means according to the documentation that it
didn't succeeded.

So I tried to create a new heap to test if it's a problem with the crt heap:

HANDLE hh = HeapCreate(0, 0, 0);
ULONG HeapFragValue = 2;
int ret = HeapSetInformation(hh, HeapCompatibilityInformation,
&HeapFragValue, sizeof(HeapFragValue));

This also returns 0.

So what's the trick?

Any hints are welcome.

Ralf

Have you tried to use GetLastError and/or to see if HeapCreate fails for the
second one ?
(and I would try rather a group such as
microsoft.public.dotnet.languages.vc).

--
Patrice

"Ralf Tobel" <rtobel (AT) abc (DOT) com> a écrit dans le message de
news:eBqq%23gk2FHA.632 (AT) TK2MSFTNGP10 (DOT) phx.gbl...

device attached to the system is not functioning.

Problem solved.

It only doesn't work if you start the application inside the debugger.

Ralf

If you want to use LFH in debug, add (or set, if exists) _NO_DEBUG_HEAP environment variable (plain windows environment variable) with value 1
_NO_DEBUG_HEAP = 1


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