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POBuilding Lua Modules for LuaInterface
 

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    <p>I have a Lua module (<a href="https://github.com/LuaDist/lpack" rel="nofollow">lpack</a>) that I need to load into LuaInterface. I've tried a few different configurations for the project, but I can't seem to figure out the linking. </p> <p>I get the error <code>unresolved external symbol "void __stdcall lua_replace(struct lua_State *,int)" (?lua_replace@@YGXPAUlua_State@@H@Z) referenced in function "int __stdcall l_unpack(struct lua_State *)" (?l_unpack@@YGHPAUlua_State@@@Z)</code></p> <p>If I run <code>dumpbin /exports</code> on the lua51.lib file, I can find <code>?lua_replace@@YAXPAUlua_State@@H@Z</code> which matches what I find in the lua51.dll with Dependency Walker <code>?lua_replace@@YAXPAUlua_State@@H@Z</code>, so the function exists but the names don't match.</p> <p>I'm not very familiar with this level of linker management, so this may be a simple error on my part. Why is the value in the lpack build not matching that of the lua51.lib input file?</p> <p><strong>Update</strong></p> <p>All of the exports in the lua51.dll and lua51.lib files were <code>__cdecl</code> and my lpack project has been set to <code>__stdcall</code>. Changing that property (under C/C++ -> Advanced -> Calling Convention) fixed the compile issue and I now have an lpack.dll file.</p> <p>However, when I attempt to load the file from lua <code>require('lpack')</code> it fails with <code>The specified procedure could not be found.</code> </p> <p>Breaking in the lua C code that loads the library with LoadLibraryA returns NULL and a GetLastError() code of 0x7F.</p> <p><strong>Update 2</strong></p> <p>The lpack.dll file I was attempting to load was out of date due to a wrong output directory, so that fixed the LoadLibrary failure. Next the GetProcAddress would fail, but if I added <code>extern "C"</code> to the export function in the lpack.c file as per Mud's recommendation, the problem was resolved.</p>
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