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Calling external DLL fails


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I am trying to use an external DLL with LV.

This DLL is known to work with VB and C++; however, when I call it LV traps a low level memory corruption error and stops the VI.

What might be the problem - or what am I doing wrong?

Gyc

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I tried to pass the string as "handle" and as "handle pointer" but it doesn't work: LV is just kicked out with absolutely no messages.

Thanks anyway!

Gyc

5239[/snapback]

That's because the DLL does NOT expect a LabVIEW handle or even a pointer to such. Instead it expects a pointer to a C string.

char somevar[]

is equivalent to

char *somevar

as far as the C compiler is concerned. This is definitely a C string pointer. Configure the Call Library Node parameter accordingly and you should be fine. A LabVIEW string handle or pointer to such can only ever be used for DLLs which have been explicitedly developed to be called by LabVIEW.

Rolf Kalbermatter

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