How to call dlls for valve system

I need to call the dll file I made from visual C++.The main theme is to control valve system from labview. I put the control switches(booleans) in labview and now want to connect it to the initial C++ program I made for valve control.Is there any way that I can use the on/off switchs(booleans) and code interface node for the system to work?Please help.I am having problems with dll calling .

I got the message" call library function :function not found in library".
I had checked for the function name,its same as is on the header file.I had tried for both C and stdcall calling conventions,still it didnot work.
please suggest what could be wrong.

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How to call dlls for valve system

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