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POTrouble compiling dll that accesses another dll
 

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    <p>So, I have an interesting issue. I am working with a proprietary set of dlls that I ,obviously, don't have the source for. The goal is to write an intermediate dll that groups together a large series of funnction calls from the proprietary dlls. The problem I am having, when compiling with g++, is that I get errors for the original dlls along the lines of: cannot export libname_NULL_THUNK_DATA. Symbol not found.</p> <p>If I add a main and just compile to an executable everything works as expected. I'm using mingw for compilation. Thanks for any help.</p> <p>In response to the first reply: Either I'm confused about what you're saying or I didn't word my question very well. I'm not explicitly trying to export anything from my wrapper I am just calling functions from their dlls. The problem is that I get errors that it can't export these specific symbols from the dll to my wrapper. The issue is that I'm not even entirely sure what these _NULL_THUNK_DATA symbols are for. I did a search and read somewhere that they shouldn't be exported because they're internal symbols that windows uses. I have tried using the --exclude-symbols directive to the linker but it didn't seem to do anything. I apologize if I'm completely misunderstanding what you're trying to say.</p> <p>So, I think my issue was related to this. When just compiling a standard executable that uses a dll I was able to include the headers and directly call the functions for example:</p> <pre><code>#include :3rdparty.h int main(){ dostuff(); // a function in the 3rdparty.dll } </code></pre> <p>this would compile and run fine. I just needed to link the libraries in the g++ command. When linking with the -shared flag I would get these errors (with main removed of course). I think it has something to do with the fact that by default g++ attempts to import all symbols from the dll. What I didn't understand is why this happens in the dll vs in an executable. I will try doing it using GetProcAddress(). Thank you!</p>
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