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Creating FieldPoint DLL to be used in C#

Hello,
 
i'm trying to creat a dll to be used in C# program, but when i switch the "Default Calling Conversion" to _stdcall" and try to build the DLL i get 3 Link errors:
1. Undefined symbol '_FP_Open@8 referenced in FPDigitalOutput.c
2. Undefined symbol '_FP_CreateTagIOPoint@20' referenced in FPDigitalOutput.c
3. Undefined symbol '_FP_Write@16' referenced in FPDigitalOutput.c
 
if i run the program in as an executable, i do not have any problems, but errors show up only when i use the _stdcall and try to create the dll.
 
any ideas please?
 
thanks,
Bassam
727-803-3188
 
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