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Open Watcom IDE - Import DLL

Posted on 2009-05-08
Medium Priority
Last Modified: 2012-06-27
I am working on a project using the Open Watcom IDE. I wrote and compiled a seperate DLL that I want to use in my main project. I declared it in my code using __declspec(dllimport) (this works for all of windows api functions), but I get a undefined function linker error. I believe I have to change the linker switches to import the .lib file, but I'm not sure how to do this. Any ideas?
Question by:secondeff
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LVL 40

Accepted Solution

evilrix earned 500 total points
ID: 24341285
>> I declared it in my code using __declspec(dllimport)
And when you built the dll you used __declspec(export) right?

>> I believe I have to change the linker switches to import the .lib
You need to add the library stub generated when you built the DLL to your project as a static library. Alternativly, you can load the DLL at runtile using LoadLibrary but I doubt this is what you wan to do.
LVL 40

Assisted Solution

mrjoltcola earned 500 total points
ID: 24341299
You are on the right track. You need to link the import lib, assuming one was created when you compiled the DLL

I don't use Open Watcom, but from what I can read, you need to use the IMPORT directive on the comand line:

Assuming you need to import function func from myapi.dll

IMPORT func_ myapi

See: http://www.openwatcom.org/index.php/Writing_DLLs
LVL 40

Expert Comment

ID: 24341302
Doh, I'm slow tonight...
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Author Comment

ID: 24341433
Thanks for the feedback. I added the directive IMPORT func_ myapi to the linker. It finally linked without any problems. However, I get this error message when I run the program: "The procedure entry point func_ could not be located in the dynamic link library myapi." I'm using just a simple function to test loading a dll. Here is my dll source code:
__declspec(dllexport) void func()

Author Comment

ID: 24341461
evilrix - A library file was generated when I compiled the dll. I copied both files into the project directory, and added the .lib file as a new source to my project. I still get the same linker error.

Author Comment

ID: 24341466
Do you know how to add to my project as a static library?
LVL 40

Expert Comment

ID: 24341481
Use dependency walker to confirm the entry point does exist in the DLL

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