Direct3D question

**Wick** · 09-15-2003

For some reason, whenever I call Direct3DCreate9(D3D_SDK_VERSION) inside a class' member function such as:

Code:

HRESULT D3DControlObj::InitD3D(HWND hWnd)
{
    if ((g_pD3D = Direct3DCreate9(D3D_SDK_VERSION)) == NULL)
    {
        return E_FAIL;
    }
}

I get the following linker error:

D3D error LNK2019: unresolved external symbol _Direct3DCreate9@4 referenced in function "public: long __thiscall D3DControlObj::InitD3D(struct HWND__ *)" (?InitD3D@D3DControlObj@@QAEJPAUHWND__@@@Z)

but when I call it in a function in my main.cpp file it works fine.

Code:

HRESULT InitD3D(HWND hWnd)
{
    if ((g_pD3D = Direct3DCreate9(D3D_SDK_VERSION)) == NULL)
    {
        return E_FAIL;
    }
}

I really want to be able to use OOP and have a class that contains all of my Direct3D stuff usage. Any ideas on how to resolve this?

**confuted** · 09-16-2003

Include the D3D headers in the file with your class.

Oh, and if it's a seperate project, make sure you're linking the right libraries in the project with the classes.

**kurtmax_0** · 09-16-2003

The way I keep make sure all my source has the right include files is just make a header file like common.h Something like this:

Code:

// common.h - common include files
#ifndef _COMMON_H_
#define _COMMON_H_

#include <d3d.h>
#include <dsound.h>
#include <whateverneedsincluding.h>
//....

#endif

Then in all of the source files of your project make sure to put #include "common.h" in it.

This should solve most problems. Of course you will want to make sure that you have the libraries defined.

If you are using VC++ just go to Project->Settings: Link Tab: library modules and add the libraries there. or if you like everything in code, put this in one of your source files (preferably the main one):

Code:

#pragma comment(lib, d3d.lib)
#pragma comment(lib, etcblahblah.lib)

hope this helps.

**Wick** · 09-17-2003

Right. I do the same.

My main.h file (included in every file in my project):

Code:

#ifndef main_h
#define main_h

#include <d3d9.h>
#other includes

#endif

That doesn't seem to be the problem.

**Rhoon** · 02-28-2005

Here's my include statements and what not in my gameEngine.h file. I just put all my include statements in this file, makes it a lot easier.

#ifndef _GAMEENGINE_H_
#define _GAMEENGINE_H_

#include <windows.h>
// DirectX Includes for Direct3D
#include <d3d9.h>
#pragma comment(lib, "d3d9.lib") // Direct3D would NOT work until I put this in.
// Although I compiled the examples and there was no problem... no idea why.

If that #pragma doesn't work, check out :
http://msdn.microsoft.com/library/de...ir_comment.asp
for more information... hope it helps.

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