[boost] boost.python error with DirectX

From: Elaine Wong (wongpl0503_at_[hidden])
Date: 2007-10-01 07:16:24

I am using boost.python to wrap C++ function which includes 
 directmusic libraries to simply play the midi, but lots of linkage 
 errors "error LNK2001: unresolved external symbol". I wonder if it is 
 possible to work with DirectX - directmusic libs.  Are there any ways 
 to wrap it? 
 *********************compilation errors ************************* 
  msvc.link.dll bin\msvc-7.1\debug\threading-multi\playmusic.pyd bin 
 \msvc-7.1\debu 
 g\threading-multi\playmusic.lib 
    Creating library bin\msvc-7.1\debug\threading-multi\playmusic.lib 
 and object 
 bin\msvc-7.1\debug\threading-multi\playmusic.exp 
 playmusic.obj : error LNK2001: unresolved external symbol 
 _GUID_PerfMasterTempo 
 playmusic.obj : error LNK2019: unresolved external symbol 
 __imp__CoUninitialize@ 
 0 referenced in function "void __cdecl `anonymous 
 namespace'::StartPlay(void)" ( 
 ?StartPlay@?A0xc386fc44@@YAXXZ) 
 playmusic.obj : error LNK2001: unresolved external symbol 
 _CLSID_DirectMusicSegm 
 ent 
 playmusic.obj : error LNK2001: unresolved external symbol 
 _IID_IDirectMusicSegme 
 nt8 
 playmusic.obj : error LNK2001: unresolved external symbol 
 _GUID_DirectMusicAllTy 
 pes 
 playmusic.obj : error LNK2001: unresolved external symbol 
 _CLSID_DirectMusicPerf 
 ormance 
 playmusic.obj : error LNK2001: unresolved external symbol 
 _IID_IDirectMusicPerfo 
 rmance8 
 playmusic.obj : error LNK2019: unresolved external symbol 
 __imp__CoCreateInstanc 
 e_at_20 referenced in function "void __cdecl `anonymous 
 namespace'::StartPlay(void) 
 " (?StartPlay@?A0xc386fc44@@YAXXZ) 
 playmusic.obj : error LNK2001: unresolved external symbol 
 _CLSID_DirectMusicLoad 
 er 
 playmusic.obj : error LNK2001: unresolved external symbol 
 _IID_IDirectMusicLoade 
 r8 
 playmusic.obj : error LNK2019: unresolved external symbol 
 __imp__CoInitialize_at_4 
 referenced in function "void __cdecl `anonymous 
 namespace'::StartPlay(void)" (?S 
 tartPlay@?A0xc386fc44@@YAXXZ) 
 bin\msvc-7.1\debug\threading-multi\playmusic.pyd : fatal error 
 LNK1120: 11 unres 
 olved externals 
 
        call "C:\Program Files\Microsoft Visual Studio .NET 
 2003\Vc7\bin\vcvars3 
 2.bat"  >nul 
 link /NOLOGO /INCREMENTAL:NO /DLL /DEBUG /subsystem:console /out:"bin 
 \msvc-7.1\d 
 ebug\threading-multi\playmusic.pyd" /IMPLIB:"bin\msvc-7.1\debug 
 \threading-multi\ 
 playmusic.lib" /LIBPATH:"C:\Panda3D-1.4.0\python\libs"   @"bin 
 \msvc-7.1\debug\th 
 reading-multi\playmusic.pyd.rsp" 
         if %ERRORLEVEL% NEQ 0 EXIT %ERRORLEVEL% 
         if exist "bin\msvc-7.1\debug\threading-multi 
 \playmusic.pyd.manifest" ( 
             mt -nologo -manifest "bin\msvc-7.1\debug\threading-multi 
 \playmusic.p 
 yd.manifest" "-outputresource:bin\msvc-7.1\debug\threading-multi 
 \playmusic.pyd;2 
 " 
         ) 
 
...failed msvc.link.dll bin\msvc-7.1\debug\threading-multi 
 \playmusic.pyd bin\msv 
 c-7.1\debug\threading-multi\playmusic.lib... 
 ...removing bin\msvc-7.1\debug\threading-multi\playmusic.lib 
 ...failed updating 2 targets... 
 
******************************************compiliation 
 errors************** 
 
In C++, Inside "playmusic.cpp", it needs to include following 
 DirectMusic libs.  The link errors mainly related to directmusic 
 stuff. 
 
#include <dmusicc.h> 
 #include <dmusici.h> 
 #include <dmusicf.h> 
 
************* playmusic.cpp************************* 
 
#include <boost/python/class.hpp> 
 #include <boost/python/module.hpp> 
 #include <boost/python/def.hpp> 
 #include "boost/python/detail/wrap_python.hpp" 
 
//using namespace std; 
 #include <windows.h> 
 #include <dmusicc.h> 
 #include <dmusici.h> 
 #include <dmusicf.h> 
 
namespace { 
 //----------------------------------------------------------------------------- 
 // Defines, constants, and global variables 
 //----------------------------------------------------------------------------- 
 void StartPlay(); 
 
IDirectMusicLoader8*      g_pLoader         = NULL; 
 IDirectMusicPerformance8* g_pPerformance    = NULL; 
 IDirectMusicSegment8*     g_pSegment        = NULL; 
 FLOAT fTempo; 
 
void StartPlay() { 
 
    // Initialize COM 
     CoInitialize(NULL); 
 
    // Create loader object 
     CoCreateInstance( CLSID_DirectMusicLoader, NULL, CLSCTX_INPROC, 
                       IID_IDirectMusicLoader8, (void**)&g_pLoader ); 
 
............. 
 ............. 
 namespace python = boost::python; 
 
BOOST_PYTHON_MODULE(playmusic) 
 { 
     python::def("StartPlay", StartPlay); 
 
} 
 

*********** playmusic.cpp*************************** 
 The code in void StartPlay() inside "playmusic.cpp" can be compiled 
 and executed successfully before in C++, so I extract that part. 
 Any ideas?  Thanks so much for your help 
       
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