Any way to use Delphi strings?

I know that LabView can, when calling external libraries, use Pascal string pointers. However, those are limited, is there a way to call an external library using a Delphi string?
FYI: a Pascal string uses one byte for it's length, a Delphi string uses 4 bytes. Since I'm using Delphi for implementing the DLL, using Delphi strings would be way more straightforward than using C strings.
Solved!
Go to Solution.

Kirillenseer wrote:
Thank you, I'll try to go with the handle method, pointer to a Delphi string reference. Still funny that LV string and Delphi string are the exact same beasts, yet can't interoperate seamlessly.
They are not the same! They look the same in terms of the actual byte layout in memory, but the memory management is entirely different. The LabVIEW String is a LabVIEW Handle, an internal memory object managed by the LabVIEW memory manager functions and using a pointer to a pointer to the actual information. Any modification to the string that requires to change its size MUST be performed by calling the according memory manager functions, or a crash is immediately evident.
The Pascal String is a memory area managed by the Delphi runtime library (and maybe, possibly, but likely not documented be implemented under Windows on top of the SysString datatype.) and repreents just a pointer to the data.
If you want to pass in a string to a DLL function that is passed in by reference (VAR keyword) you can get away with configuring it as a LabVIEW String handle. But if the string is passed into the function by value (just the String itself) this won't work at all. And if the function is supposed to return information in the string you can't do it without either a wrapper or some pointer magic implemented in the diagram. This is because if you configure it as a LabVIEW Handle, LabVIEW expects it to be allocated by its memory manager functions, but Delphi will do it with its Delphi runtime functions and as soon as LabVIEW attempts to free that string, it will crash, since the memory loacation is not allocated from the heap managed by the LabVIEW memory manager.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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