Separated sources for my functions

[zapakitul]

I'm trying to make a few functions and classes an put them in separated files, and then include them and call then when ever i need. Thing is, i do not understand what am i doing wrong. Here's an example:
Main.cpp

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#include "header.cpp"


int main()
{
	

	CreateWindow();

	guienv->addStaticText(L"Hello World! This is the Irrlicht Software renderer!",
		rect<s32>(10,10,260,22), true);


	IAnimatedMesh* mesh = smgr->getMesh("../../media/sydney.md2");
	if (!mesh)
		return 1;
	IAnimatedMeshSceneNode* node = smgr->addAnimatedMeshSceneNode( mesh );


	if (node)
	{
		node->setMaterialFlag(EMF_LIGHTING, false);
		node->setMD2Animation(scene::EMAT_STAND);
		node->setMaterialTexture( 0, driver->getTexture("../../media/sydney.bmp") );
	}


	smgr->addCameraSceneNode(0, vector3df(0,30,-40), vector3df(0,5,0));


	while(device->run())
	{

		driver->beginScene(true, true, SColor(255,100,101,140));

		smgr->drawAll();
		guienv->drawAll();

		driver->endScene();
	}


	device->drop();

	return 0;
}

Header.h

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#ifndef _HEADER_H_
#define _HEADER_H_

#ifdef _IRR_WINDOWS_
#pragma comment(lib, "Irrlicht.lib")
#pragma comment(linker, "/subsystem:windows /ENTRY:mainCRTStartup")
#endif

int CreateWindow();

#endif _HEADER_H_

Header.cpp

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#include <irrlicht.h>
#include "header.h"

#pragma once

using namespace irr;
using namespace core;
using namespace scene;
using namespace video;
using namespace io;
using namespace gui;


int CreateWindow()
{
			IrrlichtDevice *device =
#ifdef _IRR_OSX_PLATFORM_
		createDevice( video::EDT_OPENGL, dimension2d<s32>(1024, 768), 16,
			false, false, false, 0);
#else
		createDevice( video::EDT_SOFTWARE, dimension2d<s32>(1024, 768), 16,
			false, false, false, 0);
#endif
	if (!device)
		return 1;

		device->setWindowCaption(L"Hello World! - Irrlicht Engine Demo");

	IVideoDriver* driver = device->getVideoDriver();
	ISceneManager* smgr = device->getSceneManager();
	IGUIEnvironment* guienv = device->getGUIEnvironment();
}

When i try to compile it, it gives me the following errors:

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1>main.cpp
1>d:\swift\main.cpp(10) : error C2065: 'guienv' : undeclared identifier
1>d:\swift\main.cpp(10) : error C2227: left of '->addStaticText' must point to class/struct/union/generic type
1>        type is ''unknown-type''
1>d:\swift\main.cpp(14) : error C2065: 'smgr' : undeclared identifier
1>d:\swift\main.cpp(14) : error C2227: left of '->getMesh' must point to class/struct/union/generic type
1>        type is ''unknown-type''
1>d:\swift\main.cpp(17) : error C2065: 'smgr' : undeclared identifier
1>d:\swift\main.cpp(17) : error C2227: left of '->addAnimatedMeshSceneNode' must point to class/struct/union/generic type
1>        type is ''unknown-type''
1>d:\swift\main.cpp(24) : error C2065: 'driver' : undeclared identifier
1>d:\swift\main.cpp(24) : error C2227: left of '->getTexture' must point to class/struct/union/generic type
1>        type is ''unknown-type''
1>d:\swift\main.cpp(28) : error C2065: 'smgr' : undeclared identifier
1>d:\swift\main.cpp(28) : error C2227: left of '->addCameraSceneNode' must point to class/struct/union/generic type
1>        type is ''unknown-type''
1>d:\swift\main.cpp(31) : error C2065: 'device' : undeclared identifier
1>d:\swift\main.cpp(31) : error C2227: left of '->run' must point to class/struct/union/generic type
1>        type is ''unknown-type''
1>d:\swift\main.cpp(31) : fatal error C1903: unable to recover from previous error(s); stopping compilation
1>Build log was saved at "file://d:\Swift\Debug\BuildLog.htm"
1>Swift - 13 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

[Sylence]

First: You have to include the header file. No the source file. So in your main.cpp it must be

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#include "header.h"

Second: guienv, smgr, etc. are local variables for the function CreateWindow(). You cannot use them outside this function because they don't exist outside. This is why you get these errors.

You could either make these variables globals or let CreateWindow() return a pointer to the created device.

[teamAlpha]

^ What he/she said , plus you'll need to return a structure that will contain information about the device.

Eg :

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struct IrrInitResult
{
   IVideoDriver* driver;
   ISceneManager* smgr;
   IGUIEnvironment* guienv; 

   IrrInitResult():driver(NULL),smgr(NULL),guienv(NULL){}
};


IrrInitResult createDevice( args??? )
{
     IrrInitResult r;

     r.driver = get driver .. etc

     return r;

}

... inside main :

IrrInitResult sys = createDevice();
sys.driver->do something();

[Sylence]

He ^^

I don't see the need for a structure. You can get the pointer to the gui, scene, and driver through the device.