C / C++ / MFC

John R. Shaw wrote:

I have seen header files that include each other, a very bad idea, but they usualy solve the problems that presents with forward declarations and the like.

John R. Shaw wrote:

I can not even remember if I have ever made that mistake in design.

server error LNK2005: "private: __thiscall type_info::type_info(class type_info const &)" (??0type_info@@AAE@ABV0@@Z) already defined in LIBCD.lib(typinfo.obj)<br />
server error LNK2005: "private: class type_info & __thiscall type_info::operator=(class type_info const &)" (??4type_info@@AAEAAV0@ABV0@@Z) already defined in LIBCD.lib(typinfo.obj)

server error LNK2005: _exit already defined in LIBCD.lib(crt0dat.obj)<br />
server error LNK2005: _strncpy already defined in LIBCD.lib(strncpy.obj)<br />
server error LNK2005: _fgetc already defined in LIBCD.lib(fgetc.obj)<br />
server error LNK2005: _fclose already defined in LIBCD.lib(fclose.obj)<br />
server error LNK2005: _setvbuf already defined in LIBCD.lib(setvbuf.obj)<br />
server error LNK2005: __isctype already defined in LIBCD.lib(isctype.obj)<br />
server warning LNK4098: defaultlib 'msvcrt.lib' conflicts with use of other libs; use /NODEFAULTLIB:library

server error LNK2001: unresolved external symbol "class SockHnd network" (?network@@3VSockHnd@@A)<br />
server error LNK2019: unresolved external symbol "class SockHnd network" (?network@@3VSockHnd@@A) referenced in function "public: bool __thiscall SockHnd::Start(int,int)" (?Start@SockHnd@@QAE_NHH@Z)

server error LNK2001: unresolved external symbol "class SockHnd network" (?network@@3VSockHnd@@A)<br />
server error LNK2019: unresolved external symbol "class SockHnd network" (?network@@3VSockHnd@@A) referenced in function "public: bool __thiscall SockHnd::Start(int,int)" (?Start@SockHnd@@QAE_NHH@Z)<br />
server error LNK2001: unresolved external symbol "class std::basic_ostream<char,struct std::char_traits<char> > std::cout" (?cout@std@@3V?$basic_ostream@DU?$char_traits@D@std@@@1@A)<br />
server error LNK2001: unresolved external symbol "class std::basic_ostream<char,struct std::char_traits<char> > std::cout" (?cout@std@@3V?$basic_ostream@DU?$char_traits@D@std@@@1@A)<br />
server error LNK2019: unresolved external symbol __RTC_CheckEsp referenced in function _SDL_main<br />
server error LNK2019: unresolved external symbol __RTC_CheckEsp referenced in function "public: bool __thiscall SockHnd::Start(int,int)" (?Start@SockHnd@@QAE_NHH@Z)<br />
server error LNK2001: unresolved external symbol __RTC_Shutdown<br />
server error LNK2001: unresolved external symbol __RTC_Shutdown<br />
server error LNK2001: unresolved external symbol __RTC_InitBase<br />
server error LNK2001: unresolved external symbol __RTC_InitBase<br />
server error LNK2019: unresolved external symbol ___CxxFrameHandler referenced in function __ehhandler$?put@?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEAAV12@D@Z<br />
server error LNK2001: unresolved external symbol ___CxxFrameHandler<br />
server error LNK2019: unresolved external symbol @_RTC_CheckStackVars@8 referenced in function __catch$?put@?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEAAV12@D@Z$0<br />
server error LNK2019: unresolved external symbol @_RTC_CheckStackVars@8 referenced in function "public: void __thiscall SockHnd::FindConnections(void)" (?FindConnections@SockHnd@@QAEXXZ)<br />
server error LNK2019: unresolved external symbol __except_list referenced in function "public: class std::basic_ostream<char,struct std::char_traits<char> > & __thiscall std::basic_ostream<char,struct std::char_traits<char> >::put(char)" (?put@?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEAAV12@D@Z)<br />
server error LNK2019: unresolved external symbol __except_list referenced in function "public: void __thiscall SockHnd::FindConnections(void)" (?FindConnections@SockHnd@@QAEXXZ)<br />
server error LNK2019: unresolved external symbol "public: void __thiscall std::ios_base::clear(int,bool)" (?clear@ios_base@std@@QAEXH_N@Z) referenced in function "public: void __thiscall std::basic_ios<char,struct std::char_traits<char> >::clear(int,bool)" (?clear@?$basic_ios@DU?$char_traits@D@std@@@std@@QAEXH_N@Z)<br />
server error LNK2001: unresolved external symbol "public: void __thiscall std::ios_base::clear(int,bool)" (?clear@ios_base@std@@QAEXH_N@Z)<br />
server error LNK2019: unresolved external symbol "bool __cdecl std::uncaught_exception(void)" (?uncaught_exception@std@@YA_NXZ) referenced in function "public: __thiscall std::basic_ostream<char,struct std::char_traits<char> >::sentry::~sentry(void)" (??1sentry@?$basic_ostream@DU?$char_traits@D@std@@@std@@QAE@XZ)<br />
server error LNK2019: unresolved external symbol "bool __cdecl std::uncaught_exception(void)" (?uncaught_exception@std@@YA_NXZ) referenced in function __catch$??6?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEAAV01@J@Z$0<br />
server error LNK2019: unresolved external symbol _strlen referenced in function "public: static unsigned int __cdecl std::char_traits<char>::length(char const *)" (?length@?$char_traits@D@std@@SAIPBD@Z)<br />
server error LNK2001: unresolved external symbol _strlen<br />
server error LNK2019: unresolved external symbol "void * __cdecl operator new[](unsigned int)" (??_U@YAPAXI@Z) referenced in function "public: bool __thiscall SockHnd::Start(int,int)" (?Start@SockHnd@@QAE_NHH@Z)<br />
server error LNK2019: unresolved external symbol __RTC_UninitUse referenced in function "public: int __thiscall SockHnd::UserThread(struct Player)" (?UserThread@SockHnd@@QAEHUPlayer@@@Z)<br />
server error LNK2019: unresolved external symbol _free referenced in function "void __cdecl std::_DebugHeapDelete<class std::locale::facet>(class std::locale::facet *)" (??$_DebugHeapDelete@Vfacet@locale@std@@@std@@YAXPAVfacet@locale@0@@Z)<br />
server error LNK2001: unresolved external symbol "public: __thiscall exception::exception(class exception const &)" (??0exception@@QAE@ABV0@@Z)<br />
server error LNK2001: unresolved external symbol "public: __thiscall bad_cast::bad_cast(class bad_cast const &)" (??0bad_cast@@QAE@ABV0@@Z)<br />
server error LNK2001: unresolved external symbol "const type_info::`vftable'" (??_7type_info@@6B@)<br />
server error LNK2001: unresolved external symbol "public: virtual __thiscall bad_cast::~bad_cast(void)" (??1bad_cast@@UAE@XZ)<br />
server error LNK2019: unresolved external symbol "public: void __thiscall std::locale::facet::_Register(void)" (?_Register@facet@locale@std@@QAEXXZ) referenced in function "class std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > > const & __cdecl std::use_facet<class std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > > >(class std::locale const &)" (??$use_facet@V?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@@std@@YAABV?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@0@ABVlocale@0@@Z)<br />
server error LNK2019: unresolved external symbol "public: __thiscall bad_cast::bad_cast(char const *)" (??0bad_cast@@QAE@PBD@Z) referenced in function "class std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > > const & __cdecl std::use_facet<class std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > > >(class std::locale const &)" (??$use_facet@V?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@@std@@YAABV?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@0@ABVlocale@0@@Z)<br />
server error LNK2019: unresolved external symbol "public: class std::locale::facet const * __thiscall std::locale::_Getfacet(unsigned int)const " (?_Getfacet@locale@std@@QBEPBVfacet@12@I@Z) referenced in function "class std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > > const & __cdecl std::use_facet<class std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > > >(class std::locale const &)" (??$use_facet@V?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@@std@@YAABV?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@0@ABVlocale@0@@Z)<br />
server error LNK2019: unresolved external symbol __CxxThrowException@8 referenced in function "class std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > > const & __cdecl std::use_facet<class std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > > >(class std::locale const &)" (??$use_facet@V?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@@std@@YAABV?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@0@ABVlocale@0@@Z)<br />
server error LNK2001: unresolved external symbol "private: static int std::locale::id::_Id_cnt" (?_Id_cnt@id@locale@std@@0HA)<br />
server error LNK2019: unresolved external symbol "void __cdecl operator delete(void *,struct std::_DebugHeapTag_t const &,char *,int)" (??3@YAXPAXABU_DebugHeapTag_t@std@@PADH@Z) referenced in function __unwindfunclet$?_Getcat@?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@SAIPAPBVfacet@locale@2@@Z$0<br />
server error LNK2019: unresolved external symbol "void * __cdecl operator new(unsigned int,struct std::_DebugHeapTag_t const &,char *,int)" (??2@YAPAXIABU_DebugHeapTag_t@std@@PADH@Z) referenced in function "public: static unsigned int __cdecl std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > >::_Getcat(class std::locale::facet const * *)" (?_Getcat@?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@SAIPAPBVfacet@locale@2@@Z)<br />
server error LNK2001: unresolved external symbol "struct std::_DebugHeapTag_t const std::_DebugHeapTag" (?_DebugHeapTag@std@@3U_DebugHeapTag_t@1@B)<br />
server error LNK2019: unresolved external symbol "public: __thiscall std::_Locinfo::~_Locinfo(void)" (??1_Locinfo@std@@QAE@XZ) referenced in function "public: __thiscall std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > >::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > >(unsigned int)" (??0?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QAE@I@Z)<br />
server error LNK2019: unresolved external symbol "public: __thiscall std::_Locinfo::_Locinfo(char const *)" (??0_Locinfo@std@@QAE@PBD@Z) referenced in function "public: __thiscall std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > >::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > >(unsigned int)" (??0?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QAE@I@Z)<br />
server error LNK2019: unresolved external symbol "void __cdecl operator delete(void *)" (??3@YAXPAX@Z) referenced in function "public: virtual void * __thiscall std::locale::facet::`scalar deleting destructor'(unsigned int)" (??_Gfacet@locale@std@@UAEPAXI@Z)<br />
server error LNK2019: unresolved external symbol _memcpy referenced in function "public: static char * __cdecl std::char_traits<char>::copy(char *,char const *,unsigned int)" (?copy@?$char_traits@D@std@@SAPADPADPBDI@Z)<br />
server error LNK2019: unresolved external symbol _sprintf referenced in function "protected: virtual class std::ostreambuf_iterator<char,struct std::char_traits<char> > __thiscall std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > >::do_put(class std::ostreambuf_iterator<char,struct std::char_traits<char> >,class std::ios_base &,char,long)const " (?do_put@?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@MBE?AV?$ostreambuf_iterator@DU?$char_traits@D@std@@@2@V32@AAVios_base@2@DJ@Z)<br />
server error LNK2001: unresolved external symbol __fltused<br />
server error LNK2019: unresolved external symbol "public: void __thiscall std::_String_base::_Xran(void)const " (?_Xran@_String_base@std@@QBEXXZ) referenced in function "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> >::assign(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,unsigned int,unsigned int)" (?assign@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@ABV12@II@Z)<br />
server error LNK2019: unresolved external symbol _memmove referenced in function "public: static char * __cdecl std::char_traits<char>::move(char *,char const *,unsigned int)" (?move@?$char_traits@D@std@@SAPADPADPBDI@Z)<br />
server error LNK2019: unresolved external symbol "public: void __thiscall std::_String_base::_Xlen(void)const " (?_Xlen@_String_base@std@@QBEXXZ) referenced in function "protected: bool __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::_Grow(unsigned int,bool)" (?_Grow@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@IAE_NI_N@Z)<br />
server error LNK2019: unresolved external symbol _strcspn referenced in function "private: class std::ostreambuf_iterator<char,struct std::char_traits<char> > __cdecl std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > >::_Fput(class std::ostreambuf_iterator<char,struct std::char_traits<char> >,class std::ios_base &,char,char const *,unsigned int,unsigned int,unsigned int,unsigned int)const " (?_Fput@?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@ABA?AV?$ostreambuf_iterator@DU?$char_traits@D@std@@@2@V32@AAVios_base@2@DPBDIIII@Z)<br />
server error LNK2019: unresolved external symbol _memchr referenced in function "private: class std::ostreambuf_iterator<char,struct std::char_traits<char> > __cdecl std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > >::_Fput(class std::ostreambuf_iterator<char,struct std::char_traits<char> >,class std::ios_base &,char,char const *,unsigned int,unsigned int,unsigned int,unsigned int)const " (?_Fput@?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@ABA?AV?$ostreambuf_iterator@DU?$char_traits@D@std@@@2@V32@AAVios_base@2@DPBDIIII@Z)<br />
server error LNK2019: unresolved external symbol _localeconv referenced in function "private: class std::ostreambuf_iterator<char,struct std::char_traits<char> > __cdecl std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > >::_Fput(class std::ostreambuf_iterator<char,struct std::char_traits<char> >,class std::ios_base &,char,char const *,unsigned int,unsigned int,unsigned int,unsigned int)const " (?_Fput@?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@ABA?AV?$ostreambuf_iterator@DU?$char_traits@D@std@@@2@V32@AAVios_base@2@DPBDIIII@Z)<br />
server error LNK2019: unresolved external symbol _memset referenced in function "public: static char * __cdecl std::char_traits<char>::assign(char *,unsigned int,char)" (?assign@?$char_traits@D@std@@SAPADPADID@Z)<br />
server error LNK2019: unresolved external symbol "void * __cdecl operator new(unsigned int)" (??2@YAPAXI@Z) referenced in function "char * __cdecl std::_Allocate<char>(unsigned int,char *)" (??$_Allocate@D@std@@YAPADIPAD@Z)<br />
server error LNK2019: unresolved external symbol __Getcvt referenced in function "public: struct _Cvtvec __thiscall std::_Locinfo::_Getcvt(void)const " (?_Getcvt@_Locinfo@std@@QBE?AU_Cvtvec@@XZ)<br />
server error LNK2019: unresolved external symbol "void * __cdecl operator new[](unsigned int,struct std::_DebugHeapTag_t const &,char *,int)" (??_U@YAPAXIABU_DebugHeapTag_t@std@@PADH@Z) referenced in function "char * __cdecl std::_Maklocstr<char>(char const *,char *,struct _Cvtvec const &)" (??$_Maklocstr@D@std@@YAPADPBDPADABU_Cvtvec@@@Z)<br />
server error LNK2001: unresolved external symbol _WinMainCRTStartup<br />
server fatal error LNK1120: 43 unresolved externals

union {
    double d;
    char[8] c;
} d2c;

<br />
#include <sstream><br />
<br />
// your numerical data <br />
double num1 = 3.143;<br />
<br />
// an output stream<br />
std::ostringstream outStream;<br />
std::string        outString;<br />
<br />
outStream << "Value of double is : " << num1;<br />
<br />
// if you want a standard c++ string from the stream<br />
outString = outStream.str();<br />
<br />
// VC++ stuff.  Lets write the string to a label (need to create a System::String)<br />
label1->Text = gcnew String(outStream.str().c_str());<br />

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb