Hi
Ok, some extended information now:
Originally I imported a web service by means of the LV Web Service import wizard. LabVIEW automatically created a DLL which establishes the connection (SubVI "Open Web Service GET_DETAIL"). The main VI contains this subVI and the invoke node that performs the call. This "Main.vi" works properly when run using a valid login info preconditioned. In order to get a CVI solution for the ERP call I built a shared library out of "main.vi". Calling this one using LabVIEW (call library funcion node) also works properly.
Now I created a LabWindows/CVI project to call the shared library. And this doesn't work anymore.
As you can see, the return value from the shared library is an error code. A call's return value will always be 0 in case I call the shared library out of CVI, even when I wire a constant value to the "error_code" output in the shared library for test purpose.
A C string pointer is given from CVI to the shared library so "material" can be read in CVI afterwards. This procedure basically works when I create a test project without the ERP call. Including the ERP call, the string contains the same nonsense as it did before the call, so I assume that no value is ever assigned to the string.
Attached you'll find the project VIs also including the C source. The VIs I haven't mentioned do some error handling or data manipulation stuff (e.g. add leading zeros to a string).
