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[MG-Zero]

MG-Zero

Need help with linker errors (C++)

Can someone look at this and help me figure out how to fix these linker errors?

Code: [Select]

HMD.h

#ifndef _HMD_H_
#define _HMD_H_

#include "entInfo.h"
#define _HMDID 1001030205 //ID for this file type

class CBaseHMD
{
public:
CBaseHMD(){};
int HMDID;
std::string mapName;
int spriteCount;
HVSTDAT<unsigned char *> spriteBase(); //all the sprites in this thing
int soundCount;
HVSTDAT<CBaseSound> soundBase(); //all the sounds in this thing
int entCount;
HVSTDAT<CBaseEntInfo> entities(); //all the entities in this thing
};

namespace HMDFunc
{
CBaseHMD readMap(const char * fileName);
};


Code: [Select]

HMD.cpp

#include "HMD.h"
#include "stdio.h"
#include "stdlib.h"

CBaseHMD HMDFunc::readMap(const char * fileName)
{
CBaseHMD temp;
FILE *mapFile;
unsigned char * tempSprite;

mapFile = fopen(fileName, "rb");

if (mapFile == NULL)
return temp;

fread(&temp.HMDID, sizeof(temp.HMDID), 1, mapFile);

if (temp.HMDID != _HMDID)
return temp;

fread(&temp.mapName, sizeof(temp.mapName), 1, mapFile);
fread(&temp.spriteCount, sizeof(temp.spriteCount), 1, mapFile);

for (int i = 0; i < temp.spriteCount; i++)
{
fread(&tempSprite, sizeof(tempSprite), 1, mapFile);
temp.spriteBase().addData(tempSprite);
}



return temp;
}

the errors read:

HMD.obj : error LNK2001: unresolved external symbol "public: __thiscall HVSTDAT<unsigned char *>::~HVSTDAT<unsigned char *>(void)" (??1?$HVSTDAT@PAE@@QAE@XZ)
1>HMD.obj : error LNK2001: unresolved external symbol "public: void __thiscall HVSTDAT<unsigned char *>::addData(unsigned char *)" (?addData@?$HVSTDAT@PAE@@QAEXPAE@Z)
1>HMD.obj : error LNK2001: unresolved external symbol "public: class HVSTDAT<unsigned char *> __thiscall CBaseHMD::spriteBase(void)" (?spriteBase@CBaseHMD@@QAE?AV?$HVSTDAT@PAE@@XZ)
1>C:\Harvest Engine\src\HVSTCORE\Debug\HVSTCORE.exe : fatal error LNK1120: 3 unresolved externals

I'm never good with linker errors -.-  If anyone needs to see the definition of the HVSTDAT class, give me a shout.

i love big weenies and i cannot lie

[TheDarkJay]

TheDarkJay

Re: Need help with linker errors (C++)

   HVSTDAT<unsigned char *> spriteBase(); //all the sprites in this thing
   HVSTDAT<CBaseSound> soundBase(); //all the sounds in this thing
   HVSTDAT<CBaseEntInfo> entities(); //all the entities in this thing

These are red-herrings. Look closely, you are actually declaring functions which return an object of HVSTDAT.

[Windy]

Windy

Re: Need help with linker errors (C++)

yeah, HVSTDAT needs to be defined before CBaseHMD.  or perhaps yours attemptings to use them functions and u haven't delcared thesm

[Infinitus]

Infinitus

Re: Need help with linker errors (C++)

   HVSTDAT<unsigned char *> spriteBase(); //all the sprites in this thing
   HVSTDAT<CBaseSound> soundBase(); //all the sounds in this thing
   HVSTDAT<CBaseEntInfo> entities(); //all the entities in this thing

These are red-herrings. Look closely, you are actually declaring functions which return an object of HVSTDAT.

This.

[MG-Zero]

MG-Zero

Re: Need help with linker errors (C++)

What I was trying to do was declare them as a part of the class..without the () it threw a bunch of errors at me.  So I stuck the () on them and it seemed happy with it =\  Lemme try this again..

i love big weenies and i cannot lie

[Infinitus]

Infinitus

Re: Need help with linker errors (C++)

What I was trying to do was declare them as a part of the class..without the () it threw a bunch of errors at me.  So I stuck the () on them and it seemed happy with it =\  Lemme try this again..

lol, not a good move. Just sticking random characters onto declarations may make the compiler happy, but it sure won't produce the output you want.

[wildex999]

wildex999

Re: Need help with linker errors (C++)

What I was trying to do was declare them as a part of the class..without the () it threw a bunch of errors at me.  So I stuck the () on them and it seemed happy with it =\  Lemme try this again..

What kind of errors do you get without them?
Or does it all work now?

Working on my Masters Degree in Computer Science.
Hey look, Zelda Coop....later.
Proud user of C++ for 9 years, and counting!

[MG-Zero]

MG-Zero

Re: Need help with linker errors (C++)

What I was trying to do was declare them as a part of the class..without the () it threw a bunch of errors at me.  So I stuck the () on them and it seemed happy with it =\  Lemme try this again..

lol, not a good move. Just sticking random characters onto declarations may make the compiler happy, but it sure won't produce the output you want.

Haha, I noticed.  It made sense to me at the time, but now that I'm thinking about it...what I did made NO sense at all lmao.

Hang on, while I pull those other errors up..

EDIT: haha..cool..

Code: [Select]

#include "HMD.h"
#include "stdio.h"
#include "stdlib.h"

CBaseHMD HMDFunc::readMap(const char * fileName)
{
CBaseHMD temp;
FILE *mapFile;
unsigned char * tempSprite;

mapFile = fopen(fileName, "rb");

if (mapFile == NULL)
return temp;

fread(&temp.HMDID, sizeof(temp.HMDID), 1, mapFile);

if (temp.HMDID != _HMDID)
return temp;

fread(&temp.mapName, sizeof(temp.mapName), 1, mapFile);
fread(&temp.spriteCount, sizeof(temp.spriteCount), 1, mapFile);

for (int i = 0; i < temp.spriteCount; i++)
{
fread(&tempSprite, sizeof(tempSprite), 1, mapFile);
temp.spriteBase.addData(tempSprite);
}




return temp;
}
and the errors:

>HMD.obj : error LNK2019: unresolved external symbol "public: void __thiscall HVSTDAT<unsigned char *>::addData(unsigned char *)" (?addData@?$HVSTDAT@PAE@@QAEXPAE@Z) referenced in function "class CBaseHMD __cdecl HMDFunc::readMap(char const *)" (?readMap@HMDFunc@@YA?AVCBaseHMD@@PBD@Z)

1>HMD.obj : error LNK2019: unresolved external symbol "public: __thiscall HVSTDAT<class CBaseSound>::~HVSTDAT<class CBaseSound>(void)" (??1?$HVSTDAT@VCBaseSound@@@@QAE@XZ) referenced in function __unwindfunclet$??0CBaseHMD@@QAE@XZ$0

1>HMD.obj : error LNK2019: unresolved external symbol "public: __thiscall HVSTDAT<unsigned char *>::~HVSTDAT<unsigned char *>(void)" (??1?$HVSTDAT@PAE@@QAE@XZ) referenced in function __unwindfunclet$??0CBaseHMD@@QAE@XZ$0

1>HMD.obj : error LNK2019: unresolved external symbol "public: __thiscall HVSTDAT<struct CBaseEntInfo>::HVSTDAT<struct CBaseEntInfo>(void)" (??0?$HVSTDAT@UCBaseEntInfo@@@@QAE@XZ) referenced in function "public: __thiscall CBaseHMD::CBaseHMD(void)" (??0CBaseHMD@@QAE@XZ)

1>HMD.obj : error LNK2019: unresolved external symbol "public: __thiscall HVSTDAT<class CBaseSound>::HVSTDAT<class CBaseSound>(void)" (??0?$HVSTDAT@VCBaseSound@@@@QAE@XZ) referenced in function "public: __thiscall CBaseHMD::CBaseHMD(void)" (??0CBaseHMD@@QAE@XZ)

1>HMD.obj : error LNK2019: unresolved external symbol "public: __thiscall HVSTDAT<unsigned char *>::HVSTDAT<unsigned char *>(void)" (??0?$HVSTDAT@PAE@@QAE@XZ) referenced in function "public: __thiscall CBaseHMD::CBaseHMD(void)" (??0CBaseHMD@@QAE@XZ)

1>HMD.obj : error LNK2019: unresolved external symbol "public: __thiscall HVSTDAT<struct CBaseEntInfo>::~HVSTDAT<struct CBaseEntInfo>(void)" (??1?$HVSTDAT@UCBaseEntInfo@@@@QAE@XZ) referenced in function "public: __thiscall CBaseHMD::~CBaseHMD(void)" (??1CBaseHMD@@QAE@XZ)

1>C:\Harvest Engine\src\HVSTCORE\Debug\HVSTCORE.exe : fatal error LNK1120: 7 unresolved externals

i love big weenies and i cannot lie

[Windy]

Windy

Re: Need help with linker errors (C++)

Assuming that you have your class defined in the header, and you have your functions for that class defined in a separate cpp file.  With templates, everything must be defined in the class itself, you can't separate them.

[MG-Zero]

MG-Zero

Re: Need help with linker errors (C++)

Oh, wow, news to me.  That would explain a lot.  Can I use a .hpp file by any chance?

i love big weenies and i cannot lie

[TheDarkJay]

TheDarkJay

Re: Need help with linker errors (C++)

I think most (if not all) compilers treat .hpp and .h files as the same.

From what I can tell .hpp was supposed to be a C++ Header File in the same way a .h is a C Header File, but many programmers were just too lazy to change their ways xD

P.s Don't quote me on this, I may be horrendously wrong...

[MG-Zero]

MG-Zero

Re: Need help with linker errors (C++)

yep, worked perfectly.  Thanks, guys 

i love big weenies and i cannot lie