Use of Call Function Node vi, with char type pointer

I want to be able to use a certain function from C++ DLL, and I followed the TOOLS>>IMPORT>>SHARED LIBRARY(.dll) wizard. Where I located my header file and the dll file.
However i am getting an error (1097). This is the function with the paramaters:
void Function_Name(unsigned char *L, unsigned char *H, unsigned in Len, unsigned char Adr);
I don't think, that I configured my Call Function Node, correctly. How should i set the paramaters settings of the first 2? I have tried Numeric, unsigned (and signed) Int (32, 16), pass pointer value. to accomodate the first two varaibles.
Please someone help, what should I do to accomodate the unsigned char pointers, so that I can used the function in labVIEW?

Hi Safe,
The error you're encountering has the following description (I'm sure you've already looked this up-posting here for clarity for other readers):
LabVIEW: An exception occurred within the external code called by a Call Library Function Node. This might have corrupted LabVIEW's memory. Save any work to a new location and restart LabVIEW.
Typically, this happens for one of just a few reasons:
Memory was overwritten (e.g. you passed a buffer of N bytes, but N+X bytes were modified, and an exception was thrown.
A bad pointer was passed. (This is probably not the case.)
Arguments were not passed to the function properly. (Calling conventions)
Function wasn't called from the proper thread.
Some other reason (only can be determined by inspecting in a debugger).
I've attached some pictures of how I'd configure the dialog, but there are two critical things you have to know: calling conventions and thread safety. Those are things defined by the DLL. In Windows, C vs. 'Standard' (a.k.a. Pascal) calling conventions MUST be correct, as they affect how arguments are passed on the stack. If this is wrong, then, for example, where arg1 is expected to be an unsigned char *, you may actually only pass an unsigned char. Dereferencing that number as a pointer will at best crash, at worst appear to be a valid address and silently corrupt memory.
I suggest double-checking the calling conventions. 'stdcall' is still quite common, but not the default setting in the Call Library Function dialog.
Best regards,
intvstefve
intvsteve
LabVIEW R&D
Attachments:
dllconfig11.JPG ‏40 KB
dllconfig21.JPG ‏41 KB

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