Ugh... importing classes from a DLL?!

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Socoder -> C/C++/C#/Other -> Ugh... importing classes from a DLL?!
Sun, 13 Dec 2009, 16:49
Afr0	I've made a DLL in C++ with three classes that inherits one other class. I've exported them all using _declspec(dllexport) Now... how do I load those classes from the dll so I can use 'em in my client application?! I have a feeling it might be easier to create a library instead of a dll. Is it possible to link to the library without including it into the executable file? -=-=- Afr0 Games Project Dollhouse on Github - Please fork!
Mon, 14 Dec 2009, 00:53
Afr0	I tried compiling AssetManager as a static library instead, but now the linker throws 54 errors at me, of the type: display.lib(CGfxC.obj) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::~basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(void)" (??1?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@XZ) already defined in msvcprtd.lib(MSVCP90D.dll) --v -=-=- Afr0 Games Project Dollhouse on Github - Please fork!
Mon, 14 Dec 2009, 01:00
Jayenkai	Looks like you replicated a function name, or something.. Try shoving afr0 to all your dll/library function names. -=-=- ''Load, Next List!''
Mon, 14 Dec 2009, 02:06
Afr0	Yeah, well, I managed to get it down to 16 linker errors by now. The problem is with the Dark GDK I think. I'm linking to it for my executable, but it's using alot of functions that I think are also used by my library. You can't shove afr0 to standard library classes! -=-=- Afr0 Games Project Dollhouse on Github - Please fork!
Mon, 14 Dec 2009, 02:11
Jayenkai	Oh, I thought it was your own stuff. shrugs I've always trusted code, more than libraries, you get less of this horrible mismash of modern stuff. Libraries had value when they first started, but the second people started releasing different versions of the same library, and everyone started having all those different versions on their harddrive, the whole thing got completely screwed up. If you can do a simpler import/include, I'd do that. Best to have it in there, than break because it's not! -=-=- ''Load, Next List!''
Mon, 14 Dec 2009, 02:34
Afr0	My library for dealing with The Sims Online archives is my own. But I think it's the Dark GDK library that's causing trouble. Yeah, I'm seriously considering just using my classes as they are. :\| -=-=- Afr0 Games Project Dollhouse on Github - Please fork!
Mon, 14 Dec 2009, 08:31
Phoenix	To solve the linker problems, try changing the 'Code Generation' option to be the /MTd for both of your projects. Why don't you want the library to inhere within your executable? The total size of the program will be the same, regardless of how you split it. It's not possible to load a static library dynamically. That's what makes it static: you bake it into the executable at compile-time.
Mon, 14 Dec 2009, 09:02
JL235	You can also get (slightly) better performance with a static library because it's loaded with the program in one at startup.
Mon, 14 Dec 2009, 09:39
Afr0	I've experimented with the code generation, and the most I can get it down it is 8 linker errors. I've removed msvctrd.lib, because I read that linking the DarkGDK required you to do that. 1>------ Rebuild All started: Project: TSOClient, Configuration: Release Win32 ------ 1>Deleting intermediate and output files for project 'TSOClient', configuration 'Release\|Win32' 2>------ Rebuild All started: Project: AssetManager, Configuration: Release Win32 ------ 2>Deleting intermediate and output files for project 'AssetManager', configuration 'Release\|Win32' 2>Compiling... 1>Compiling... 2>Archive.cpp 1>Main.cpp 2>FARArchive.cpp 2>.\FARArchive.cpp(82) : warning C4482: nonstandard extension used: enum 'GameType' used in qualified name 2>.\FARArchive.cpp(182) : warning C4482: nonstandard extension used: enum 'GameType' used in qualified name 2>.\FARArchive.cpp(188) : warning C4482: nonstandard extension used: enum 'GameType' used in qualified name 1>Linking... 2>DBPFArchive.cpp 1>AssetManager.lib(FARArchive.obj) : warning LNK4075: ignoring '/EDITANDCONTINUE' due to '/OPT:ICF' specification 1>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::~basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(void)" (??1?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@XZ) already defined in libcpmt.lib(string.obj) 1>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@@Z) already defined in libcpmt.lib(string.obj) 1>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > & __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::operator=(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (??4?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV01@ABV01@@Z) already defined in basic3D.lib(DBOFormat.obj) 1>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: "public: char const * __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::c_str(void)const " (?c_str@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QBEPBDXZ) already defined in libcpmt.lib(string.obj) 1>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(char const )" (??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@PBD@Z) already defined in Main.obj 1> Creating library Release\TSOClient.lib and object Release\TSOClient.exp 1>AssetManager.lib(FARArchive.obj) : warning LNK4217: locally defined symbol __invalid_parameter imported in function "public: struct FAREntry const & __thiscall std::list<struct FAREntry,class std::allocator<struct FAREntry> >::_Const_iterator<1>::operator(void)const " (??D?$_Const_iterator@$00@?$list@UFAREntry@@V?$allocator@UFAREntry@@@std@@@std@@QBEABUFAREntry@@XZ) 1>AssetManager.lib(FARArchive.obj) : warning LNK4217: locally defined symbol ??1exception@std@@UAE@XZ (public: virtual __thiscall std::exception::~exception(void)) imported in function __unwindfunclet$??0logic_error@std@@QAE@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@1@@Z$0 1>AssetManager.lib(FARArchive.obj) : warning LNK4217: locally defined symbol ??0exception@std@@QAE@XZ (public: __thiscall std::exception::exception(void)) imported in function "public: __thiscall std::logic_error::logic_error(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (??0logic_error@std@@QAE@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@1@@Z) 1>AssetManager.lib(FARArchive.obj) : warning LNK4217: locally defined symbol ??0exception@std@@QAE@ABV01@@Z (public: __thiscall std::exception::exception(class std::exception const &)) imported in function "public: __thiscall std::logic_error::logic_error(class std::logic_error const &)" (??0logic_error@std@@QAE@ABV01@@Z) 1>AssetManager.lib(FARArchive.obj) : warning LNK4217: locally defined symbol ??0exception@std@@QAE@ABQBD@Z (public: __thiscall std::exception::exception(char const * const &)) imported in function "public: __thiscall std::bad_alloc::bad_alloc(char const )" (??0bad_alloc@std@@QAE@PBD@Z) 1>AssetManager.lib(FARArchive.obj) : error LNK2019: unresolved external symbol __imp___CrtDbgReportW referenced in function "public: struct FAREntry const & __thiscall std::list<struct FAREntry,class std::allocator<struct FAREntry> >::_Const_iterator<1>::operator(void)const " (??D?$_Const_iterator@$00@?$list@UFAREntry@@V?$allocator@UFAREntry@@@std@@@std@@QBEABUFAREntry@@XZ) 1>AssetManager.lib(BinaryStream.obj) : error LNK2019: unresolved external symbol __imp___wassert referenced in function "public: __thiscall BinaryStream::BinaryStream(char * * const)" (??0BinaryStream@@QAE@QAPAD@Z) 1>Release\TSOClient.exe : fatal error LNK1120: 2 unresolved externals 1>Build log was saved at "file://c:\Users\Afr0\Documents\Visual Studio 2008\Projects\TSO\TSOClient\TSOClient\Release\BuildLog.htm" 1>TSOClient - 8 error(s), 6 warning(s) 2>BinaryStream.cpp 2>Creating library... 2>Build log was saved at "file://c:\Users\Afr0\Documents\Visual Studio 2008\Projects\TSO\AssetManager\AssetManager\Release\BuildLog.htm" 2>AssetManager - 0 error(s), 3 warning(s) ========== Rebuild All: 1 succeeded, 1 failed, 0 skipped ========== --v If I include msvctrd.lib, I get 13 errors. -=-=- Afr0 Games Project Dollhouse on Github - Please fork!
Mon, 14 Dec 2009, 10:33
Phoenix	DarkGDK is probably linking to the CRT dynamically, so try /MDd for the projects instead. \|edit\| This suggestion is probably quite pointless, since it in all likeliness is what you started out with. It's a bit hard to solve by just looking at the errors, though. Try Googling for information, fiddle about. That's the best way to fix it. \|edit\|
Wed, 16 Dec 2009, 17:30
mindstorm8191	Not to diss anyone's work, but this is what I hate so much about C/C++. You can't simply attach a file to your program - you have to work it out with the linker, write a header file, and then it still might not work. I've got no idea how much work it'd take to get multiple DLL's working together. Why can't they just make it easy? (end-rant) -=-=- Vesuvius web game
Thu, 17 Dec 2009, 10:24
Phoenix	Because it's a language which was designed almost 30 years ago. It is an outmoded way of doing things, but C++ is extremely rigid by now and the compilation model can't simply change. However, most linker errors stem from either: 1. Incompatible character sets (Unicode vs. Multi-byte) 2. Static/dynamic linking to the CRT (/MD vs. /MT) If tweaking those don't work, Google usually gives some results. In the remaining cases it is a pain.