Return Array from DLL

SamOlsen

I'm trying to return an array from a DLL.

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 extern "C" __declspec (dllexport) BYTE* _stdcall ReturnBytes(void)

{

    BYTE v[5];

    BYTE * p;
 
    p = v;
 
    *p++ = 9;

    *p++ = 0;

    *p++ = 2;

    *p++ = 1;

    *p++ = 0;
 
    return p;

}

How do I get these values when calling the DLL from VB.NET. Can I use the Marshal class to recall the pointer?

weaknessforcats

You can't do this.

Quote:

Originally Posted by SamOlson

BYTE v[5];
BYTE * p;

p = v;
...
return p;

The array v is a local variable. It get's destroyed when the function completes.

You have to allocate your array on the heap. Then you must remember to delete later. I suggest you use a handle class (smart pointer) for this. There is an article about this in the C/C++ Articles Forum.

Return Array from DLL

re: Return Array from DLL

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