Pointers to classes

  void DEF::DoCalc()
{
s = abc.getValue();// abc is a pointer which

                   // needs ''->'' to access it

                   // not ''.''

}  

    

#ifndef __D3DS__
#define __D3DS__

#include	<stdlib.h>
#include	<stdio.h>

#ifndef		WIN32_LEAN_AND_MEAN	
#define		WIN32_LEAN_AND_MEAN
#endif
#include	<windows.h>
#include	"dtexture.h"

.....

class D3ds
{

public:

	D3ds(FILE *);
	D3ds();
	~D3ds();

	OGLScene *Read3dsfile(char *);

private:

	uint dgetpos();
	void * getmem(int);
	void dsetpos(uint);
	void dread(void *, int);
	void OGLFreeScene();
	void ReadName(char *, uint);
	void ReadObjMeshBlocks(uint);
	void ReadObjectBlocks(uint);
	void ReadMaterialBlocks(uint);
	void ReadTriMeshBlocks(uint, char *);
	void ReadFaceMat(uint, OGLObject *);
	void ReadMapList(uint, OGLObject *);
	void ReadFaceList(uint, OGLObject *);
	void ReadVertList(uint, OGLObject *);
	void ReadTraMatrix(uint, OGLObject *);
	void ReadAmbient(uint, OGLMaterial *);
	void ReadAmbientColor(uint, OGLMaterial *);
	void ReadDiffuse(uint, OGLMaterial *);
	void ReadDiffuseColor(uint, OGLMaterial *);
	void ReadSpecular(uint, OGLMaterial *);
	void ReadSpecularColor(uint, OGLMaterial *);
	void BuildMaterials(OGLObject *);
	void UploadTextures();
	
	OGLMaterial * GetMaterial();
	OGLObject	* GetObject();
	Dtexture	*tex;	//take special note of this	


	char		emsg[100];
	FILE		*file, *fp;
	OGLScene	*Scene;
};

#endif

  

The dtexture.h header file with class Dtexture in case you were wondering:

      

#ifndef __DTEXTUREH__
#define __DTEXTUREH__

#ifndef		WIN32_LEAN_AND_MEAN	
#define		WIN32_LEAN_AND_MEAN
#endif

#include	<windows.h>
#include	<stdio.h>
#include	<stdlib.h>
#include	<gl\gl.h>
#include	<gl\glu.h>
#include	"ijl15.h"

#define		DATA_PATH		"data/"	//path where the 3ds and textures will be

#define		MAX_TEXTURES	300

typedef		unsigned char  uchar;
typedef		unsigned short ushort;
typedef		unsigned int   uint;
typedef		unsigned long  ulong;

class Dtexture {

	public:
		Dtexture(FILE *f) : data(0), TextureUploaded(false), file(0), fp(f), texID(0) {} //initialise variables

		Dtexture() : data(0), TextureUploaded(false), file(0), fp(0), texID(0) {} //initialise variables

		~Dtexture() { CleanUp(); }

		uint	LoadTexture(char *filename, bool createMipMaps); //returns texture ID


	private:
		char	emsg[100];
		bool	TextureUploaded;				//is the texture loaded into mem?

		uint	TexList[MAX_TEXTURES];			//texture ID

		int		width, height, bits;	//texture attributes

		int		texID;
		uchar	*data;					//texture data

		ulong	texSize;				//texture size

		ulong	size;	

		uint	UploadTexture(bool createMipMaps);
		void	CleanUp();
		void	LoadJpg(char *filename);
		void	LoadBmp(char *filename);
		void	LoadTga(char *filename);
		void	LoadPcx(char *filename);
		ulong	fileSize();
		ushort	getMemShort(uchar * buffer, int offset);
		FILE *file, *fp; //file is used for opening pics and fp is used for debugging to a file

};

#endif

  

And the d3ds.cpp file which makes use of the Dexture class with *tex pointer:

Please look at the function UploadTextures() below which makes use of *tex:
      

#include	"d3ds.h"
/*******************************************************************************************/
D3ds::D3ds(FILE *f)
{
	Scene = NULL;
	fp = f;
}
/*******************************************************************************************/
D3ds::D3ds()
{
	Scene = NULL;
	fp = NULL;
}
/*******************************************************************************************/
D3ds::~D3ds()
{
	OGLFreeScene();

}
/*******************************************************************************************/


..........

void D3ds::UploadTextures()
{
	OGLMaterial* mat;
	uint texID;
	int tcount =0, tfail =0;

	if (fp)	fprintf(fp, "\n%d materials loaded\n", Scene->materials);
	for (int n=0; n < Scene->materials; n++)
	{
		mat = &Scene->matlist[n];
		if (strlen(mat->filename) > 0)  //is a texture map defined?

		{
			if (Scene->tex == NULL) //allocate memory for Dtexture class

			{
				Scene->tex = &Dtexture(fp);//notice how I call the constructor and initialised the object *tex*

				if (Scene->tex == NULL)
					throw "Cannot allocate memory for the texture class";
			}
			texID = Scene->tex->LoadTexture(mat->filename, 1);
			if (texID == 0xFFFFFFFF) {
				mat->texUploaded = false;
				mat->texID = 0;
				tfail++;
			}
			else {
				mat->texUploaded = true;
				mat->texID = texID; 
			}
			tcount++;
		}
	}
	if (fp)	fprintf(fp, "%d textures loaded\n", tcount-tfail);
	if (fp && (tfail > 0)) fprintf(fp, "Failed to load %d textures\n", tfail);
}

  

And to confirm that it compiles and links fine (and runs fine but I cant show you that it works here)

      

--------------------Configuration: OGLCrystal - Win32 Release--------------------
Compiling resources...
Compiling...
demo.cpp
dmath.cpp
main.cpp
winapp.cpp
bands.cpp
tubes.cpp
d3ds.cpp
dtexture.cpp
sound.cpp
Linking...

OGLCrystal.exe - 0 error(s), 0 warning(s)

    

  
Loaded 'C:\tmp\Release\OGLCrystal.exe', no matching symbolic information found.
Loaded 'C:\WINNT\System32\ntdll.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\USER32.DLL', no matching symbolic information found.
Loaded 'C:\WINNT\system32\KERNEL32.DLL', no matching symbolic information found.
Loaded 'C:\WINNT\system32\GDI32.DLL', no matching symbolic information found.
Loaded 'C:\WINNT\system32\msvcrt.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\OPENGL32.DLL', no matching symbolic information found.
Loaded 'C:\WINNT\system32\ADVAPI32.DLL', no matching symbolic information found.
Loaded 'C:\WINNT\system32\rpcrt4.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\glu32.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\ddraw.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\dciman32.dll', no matching symbolic information found.
Loaded 'C:\tmp\ijl15.dll', no matching symbolic information found.
Loaded 'C:\tmp\BASS.DLL', no matching symbolic information found.
Loaded 'C:\WINNT\system32\winmm.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\msacm32.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\OLE32.DLL', no matching symbolic information found.
Loaded 'C:\WINNT\system32\mmdrv.dll', no matching symbolic information found.
The thread 0xB94 has exited with code 0 (0x0).
The program 'C:\tmp\Release\OGLCrystal.exe' has exited with code 0 (0x0).