TESCOM.DLL

Question

hello ! I could not add the file ' TESCOM.DLL ' as a reference  Can not add a reference to the file specified  with VB6 and C #  knowing that this dll was built to run with Windows 95 or Windows NT . and also I have the source code . c and . h which are the dll but I do not know how to build the dll . and thank you in advance .

Sam Hobbs · Answer

How is VB6 relevant? I think you left something critical out.

Rigane Mohamed · Answer

Finally  I could move a bit : *** The dll is unmanaged (native c++) : 1. right-click the project icon in solution explorer 2. click Add -> Existing Item 3. browse and select the dll (you will have to change the file type combo-box to be able to see it) 4. click the dll in solution explorer 5. in the properties pane change the Copy to Output Directory property to Copy if newer - to make sure the dll is copied to the debug/release directory upon compilation. 6. to access methods on the dll - you will have to use something like [DllImport(User32.dll)] - see documentation about DllImport to learn how to Marshal (connect bridge) native methods and data types into .Net methods and data types. how I can translate these steps in VB6 ?

Sam Hobbs · Answer

If the souce code has the c extension not cpp then it is nearly certainly a C program not C++. If it is a C program then you cannot add it as a reference since that requires managed code and C is not capable of using managed code. The DLL might be a COM object but if not then you need to use pinvoke to call the DLL.