I finally managed to generate DLLs from C-code (see previous posts). However when trying to compile a c++ file that has labstr.h as an include file I get the following error. Further windows.h and math.h are included.
Any ideas ? envelop.cpp labstr.h(69) : error C2371: 'HPSTR' : new definition; ... c:\programme\microsoft visual studio\vc98\include\mmsystem.h(2289) : Siehe Deklaration von 'HPSTR'