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dougmoran

DllCall pointer return type revisited

6 posts in this topic

Sorry I'm asking this again.  Don't want to bug you good people but I still can't find a way to solve this problem.

I am calling a function in a DLL using DllCall in AutoIT.  The function's return type is a pointer to an array of bytes.  I've tried everything I can think of to try to get the actual array but nothing works.  I don't have the source code for the DLL, only the header.

I am using OpenDll and getting @error=0

The function has two parameters and they are being set as expected by the function.

How can I get to the data that the DLL is returning a pointer to?

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Some example code how to do it in general:

Global $aRet = DllCall("example.dll", "ptr", ...)


Global $tResult = DllStructCreate("byte array[20]", $aRet[0])

For $i = 1 To DllStructGetSize($tResult)
    ConsoleWrite(DllStructGetData($tResult, 1, $i) & @LF)
Next

Programming today is a race between software engineers striving to
build bigger and better idiot-proof programs, and the Universe
trying to produce bigger and better idiots.
So far, the Universe is winning.

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It's not possible to be specific without seeing the code, but this reminds me of a similar issue from the past, which was fixed by using the correct calling method, i.e. "cdecl".

;o) Cor


nothing is foolproof to the sufficiently talented fool..

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New Dad,

Thank you so much for that code snippet.  It works perfectly!!!  It saved me from having to rewrite my app in C, so I owe you big-time.  If you're ever in the San Diego area look me up and I'll buy the beers.

And congrats on being a new dad!

Doug

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New Dad,

Thank you so much for that code snippet.  It works perfectly!!!  It saved me from having to rewrite my app in C, so I owe you big-time.  If you're ever in the San Diego area look me up and I'll buy the beers.

And congrats on being a new dad!

Doug

You are welcome. I'm glad I could help you. I was in San Diego in 2012, but I don't think I will ever be there again, because world is just to big. ;)


Programming today is a race between software engineers striving to
build bigger and better idiot-proof programs, and the Universe
trying to produce bigger and better idiots.
So far, the Universe is winning.

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