Memory leaks

[mjocasio]

I have an application written in c++ to call interface routines to pull out data of a certain format.
Is was written in c++ 2003. I have a application written in c# which uses these DLLs to get data. It works fine.

I upgraded the application API to 2005 (C++) and the apllication which makes reference to these DLL c# 2005.
The interface uses non manage variable like char * whatever to be use as arguments to call interface routines to retrieve the data.

This is how i declare and assign to it

char *whatever = (char*)(Marshal::AllocHGlobal(17).ToPointer());

char * whatever = (char*) Marshal::StringToHGlobalAnsi(strObjectName).ToPointer();

sprintf(chrObjectName,"%s",whatever);

Ye I move data from the unmanage * char to manage String and forth.

I getting an memory corruption when the programs run for a certain period of time. It like I the GC never retrieves the memory release back to the heap.

This is how I do the clean up

Marshal::FreeHGlobal(IntPtr(whatever));

and this is always the location where I get the error...

Is always when I try to free the memory block...

The error not always happens with the same variable.

I will appreciate any help on this matter.
I'm struggling with this. I do make sure that when I create or assign a block of memery I release it later before it gets use the variable again. It could work fine 1, 2, 3 and sometimes runs through the program without causing the memory leak exception error but most of the time it does....

[helios]

Well, which is it? Memory corruption or memory leak? Because they're two entirely different classes of errors.

Some things I would look into:
* Ensuring that the ownership of the pointers being returned by those functions is actually being transferred to me.
* Ensuring that I'm not screwing up some cast.

[mjocasio]

This is the error I get

Invalid access to memory location. (Exception from HRESULT: 0x800703E6)

and sometimes it returns Memory corruption.... I was under the impresion is was the same as
memory leaks

[mjocasio]

I do see the data coming out of the interface..... The data looks good. it just when it tries to release the memory block I get the error.... not always in the same spot.... which I told it could be memory leaks..... but anyway.... there are only four variables that I used for this purpose of moving the data from char * to String ^ and viceversa..... So I do know for fact that I do the same operations for all of them.... I appreciate any input...