Assuming the STL even defines the internal storage format of a String, I don't know what it is. Whatever it is, it's definitely not a uint32_t as you're telling Win32::API it is.

"P" passes a pointer to the a copy of the scalar's string buffer. Don't know if your String is compatible with what you are passing were you to use "P". But you're not using "P". You're using "L".

You've provided no useful data about the type. You didn't provide the calling convention used.

I think you'd be much better off using Inline::CPP.

In reply to Re^3: Perl program calling external .dll functions by ikegami
in thread Perl program calling external .dll functions by manojghosh

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