Couple of ZeroMemory questions.

I've seen alot of ZeroMemory examples, but some of its a bit confusing.

Which is the proper (or prefered way) of doing this.

WNDCLASSEX wc;

Would it be:

ZeroMemory(&wc, sizeof(WNDCLASSEX));

or:

ZeroMemory(&wc, sizeof(wc));

I've also seen alot of example where the & is left out completely.

Which way should I be using?

Code:

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VOID ZeroMemory(
  PVOID Destination,  // address of block to fill with zeros
  DWORD Length        // size, in bytes, of block to fill with zeros
);

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In your case I'll advise you to use the following syntax:

Code:

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ZeroMemory(&wc, sizeof(WNDCLASSEX));

---

Yet another random response.

I was also wondering about that... when I was taking a class, the instructor said to use this:

Code:

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memset(&wc, 0, sizeof(wc));

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I've also seen in some odd example this (at least I THINK it was for a WNDCLASSEX):

Code:

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WNDCLASSEX wc = {0};

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And in yet another:

Code:

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ZeroMemory(&wc, sizeof(wc));

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WhAt ShOuLd I uSe??!?!?!?

I personally use ZeroMemory() to set any memory to zero. If I need to set some memory to another value (Not real often) I would use memset.

- Sean

If you use c++ and the memory is not dynamic you could

Code:

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UINT mem[50] = {0};

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I always use memset. Except when using GlobalAlloc which I haven't done much lately. I don't think there's any advantage to GlobalAlloc anymore. it's a relic.

You could use

GlobalAlloc() / LocalAlloc() with the GMEM_ZEROINIT flag or

HeapAlloc() with HEAP_ZERO_MEMORY or

calloc()

to set the mem to zero as allocated.

Quote:

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Originally posted by Hershlag
I always use memset. Except when using GlobalAlloc which I haven't done much lately. I don't think there's any advantage to GlobalAlloc anymore. it's a relic.

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:)

A while back I was doing something in MASM32 and I couldnt use ZeroMemory()..I looked it up in the sdk includes and noticed that ZeroMemory isnt an exported API....its just a define for memset anyway.....so you might as well stick to memset if your happy with it.

I see :) so in short, "there are many ways to do it". Thanks everyone :p