EAccess Violation error

I have created a TestStand sequence and am trying to run a ScanWorksAPI .dll function (sw_LoadProject). When I try and run it I get an error: EAccessViolation. The sequence stops and hangs. The error code I get is "-17502, system level exception". What does this error mean? What causes it? How can I fix it?

Marek D,
First off, thanks for submitting the rest of the files.
Now, the only problem is that I cannot properly use this dll in TestStand or CVI by following the prototypes given in the msswproto.h include file.
When using the dll's functions in the same manner that you were trying to, the system level exception is actually happening on the call to sw_connect and not sw_loadproject. According to the include file, the functions use the stdcall calling convention, and if you did in fact use this header file in your CVI project then you were indeed using stdcall instead of cdecl. So now I am a bit skeptical as to whether this dll is being used properly or if this header file is indeed the header provided by the Sc
anWorksAPI.dll developer. I have included a zip file to this post that contains a new TS 2.0 seq file that for all intents and purposes is using the dll properly according to the prototypes in the msswproto.h include file, and I have also included a CVI 6.0 project that simply uses the same functions as the sequence file in the exact same manner and illustrates the same error.
From this point, I would like to see some code or example that actually uses this dll properly without error. Unless you can give me the CVI project you mentioned that works so I can discern how to actually use this dll, I will have to just leave the diagnosis as "improper use of dll" as the cause of the error you are seeing.
Jason F.
Applications Engineer
National Instruments
Attachments:
example.zip ‏68 KB

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