Memory Allocation Error 998

[Richard Andrew x64]

I'm working on a straight C program in Visual Studio 6.0. I added a few calls to malloc() today, and malloc fails every time with a NULL return value. GetLastError() returns 998 - Invalid access to memory location. The process is using only about 5 MB of RAM when this occurs, and I've restarted XP several times without curing the problem. No other process on the system shows any signs of running out of memory. When I replace calls to malloc with calls to HeapAlloc(), the program runs fine. Can anyone think of a reason why malloc might be failing?

[Stuart Dootson]

Are you absolutely sure it's malloc that's causing that error code (use SetLastError to reset the thread's error code immediately before the malloc call)? If so, all I can suggest is single-stepping through malloc (you have got the CRT source installed haven't you?) in the debugger and seeing where it fails. It's not so tricky :-) I'm afraid I can't help further, as I haven't had VC6 installed anywhere for ages (and don't even know where I could lay my hands on the install media).

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

[Richard Andrew x64]

Thanks, Stuart. I will try stepping through again. But I find it more or less fruitless because I haven't a clue how the CRT operates, and I find it very difficult to read that code with all the underscores!

[ky_rerun]

Can you build a new program that only uses malloc and see what happens. If you view the assembly does malloc actually get called. Can you post the code.

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a programmer traped in a thugs body

[Richard Andrew x64]

Thanks for your interest. I will look at the assembly as you suggest. I can't post the code until I get to work tomorrow, but I'll do so if I can't solve it on my own.

[Lost User]

me sathish u r allocating more mem tht the system can't hold using malloc. so only u can use heap functions to allocate more. :suss::suss:

ya