StrPtr and memory question

I have a questiona bout StrPtr function. It's my understanding it's dealing with memory. Do I need to de-reference it somehow after it's being called to release memory so that it does not cause any memory leak or cache?

Thanks

StrPtr is a pointer to a memory allocation. If you are copying memory from that pointer, then the memory you copied needs to be addressed, but not the pointer. Does that help?

StrPtr is to strings what ObjPtr is to objects.

Here's a nice little image I took from here:

Attachment 159637

And Microsoft also has a nice page that explains BSTRs, seen here.

It's a matter of pointers (StrPtr) versus pointers-to-pointers (VarPtr).

And StrPtr just returns a Long, so there's really nothing to release. Whatever Long you assign the return to will be released by VB6 when it goes out of scope.

Good Luck,
Elroy

And don't forget, that there is only one thing, you can do in VB with a pointer:

Pass it along to a Win-API

And no, i'm not talking about pointer-arithmetic.
You can get a Pointer to somewhere (a long-variable, a string, my dirty socks under my bed), but changing that pointer within VB (e.g. add a value to move it forward),
and then pass it along to a Win-API, you do all on your own risk.

Quote:

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Originally Posted by Zvoni

And don't forget, that there is only one thing, you can do in VB with a pointer:

Pass it along to a Win-API

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For the most part, agreed. But in VB, another use is to distinguish "" from vbNullString

Code:

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"" = vbNullString  ' true
StrPtr("") = StrPtr(vbNullString) ' false

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StrPtr is preferred way to determine if someone hit the 'Cancel' button in an InputBox.