Memory allocation

[Farabi]

How you do memory allocation. And what is the different beetween WinXP SP1 with the SP2 system?
Can you solve why I always made my software crashed on WinXP SP2 system.

[hitchhikr]

Sp2 have a some memory protection against bad coders, paste some of your crashing code (and don't forget the part where you allocate the memory).

[Farabi]

Sp2 have a some memory protection against bad coders, paste some of your crashing code (and don't forget the part where you allocate the memory).

What is the criteria of bad memory allocation coder? I dont know which part is invalid.

here is the code

Code Select Expand


invoke GlobalAlloc,GMEM_ZEROINIT or GMEM_FIXED,1024*16
mov temp_memory,eax
invoke LocalAlloc,LMEM_ZEROINIT or GMEM_FIXED,16+12
mov v_tab,eax
; You can remove this
invoke LocalAlloc,LMEM_ZEROINIT or GMEM_FIXED,1024*16
mov shot_tmp,eax
invoke LocalAlloc,LMEM_ZEROINIT or GMEM_FIXED,1024*16
mov blow_tmp,eax


[hutch--]

Farabi,

The trick is with memory is to allocate what you need, use it and make sure you de-allocate it when you are finished. The old GlobalAlloc() is still viable but not the fastest for small allocations but fine for larger sizes.

Ther are many strategies for allocating memory but its a good idea to get the concept right first, then pick the one that is best suited for your task given that most of them will do simple tasks well.

It is good coding practice to make you allocation and de-allocation at the same time then code between the two pieces of code, this way you don't have to track down where to deallocate it after you have written your code.

[Jeff]

what are the differences between the Global/Local/Heap memory functions?  i read that Global and Local are pretty much identical nowadays.  would it be okay to use Heap memory functions?  Back in class, my instructor told us to use the Heap to allocate memory (only because we never brought up the others).  would there be any benefits/drawbacks for using one over another?

[Tedd]

GlobalAlloc and LocalAlloc are exactly the same function (they were slightly diff in windows 3, but now they're only kept for compatibility.)
Indirectly, they actually end up calling HeapAlloc, so you may as well just use HeapAlloc anyway :wink