changing cursor to image woe...T^T

[Echilon]

I followed the method of how to change the cursor to be an image from the manual, but I end up with this instead:

First-chance exception at 0x013d3649 in Com S 309 Project.exe: 0xC0000005: Access violation reading location 0x0021005d.
Unhandled exception at 0x013d3649 in Com S 309 Project.exe: 0xC0000005: Access violation reading location 0x0021005d.

my code is as follows:(not all of my code)

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        TitleScreen title(device);
        ISceneManager* smgr = title.ChangeScene();
        IGUIEnvironment* guien = title.ChangeText();
        ICursorControl* cursor = device->getCursorControl();
 
        cursor->setVisible(false);
 
        IGUIImage* image = guien->addImage(driver->getTexture("../media/cursor.tga"), position2d<s32>(0, 0));
 
        ICameraSceneNode* camera = smgr->addCameraSceneNode(0, core::vector3df(0, 0, 0), core::vector3df(0, 0, -5));
 
        while(device->run()){
 
                if(currentState == -1){
                        break;
                }
 
                if(currentState == STATE_1 && receiver.IsKeyDown(KEY_RETURN)){
                        currentState = STATE_2;
                }
 
                if(currentState == STATE_2 && receiver.GetMouseState().LeftButtonDown){
                        currentState = STATE_3;
                }
 
                if(currentState == STATE_2 && receiver.IsKeyDown(KEY_ESCAPE)){
                        currentState = -1;
                }
 
                if(currentState == STATE_3 && receiver.IsKeyDown(KEY_ESCAPE)){
                        currentState = -1;
                }
 
//              if(currentState == STATE_4 && receiver.IsKeyDown(KEY_ESCAPE)){
//                      currentState = STATE_3;
//              }
 
//              if(currentState == STATE_4 && receiver.GetMouseState().LeftButtonDown){
//                      currentState= STATE_2;
//              }
 
                if(currentState != lastState){
                        if(currentState == STATE_2){
                                mainMenu menu(device);
                                smgr = menu.ChangeScene();
                                guien = menu.ChangeText();
                                lastState = currentState;
                        }else if(currentState ==STATE_3){
                                GameWorld game(device);
                                smgr = game.ChangeScene();
                                guien->clear();
                                camera = game.ChangeCamera(keyMap);
                                lastState = currentState;
                        }else if(currentState == STATE_4){
                                guien->clear();
                                guien->addStaticText(L"You are now in Game Menu\n press escape to get back to Game World, or left click to go back to Main Menu.", rect<s32>(480, 200, 1440, 300), false, true);
                                lastState = currentState;
                        }
                }
 
                driver->beginScene(true, true, SColor(255, 100, 101, 140));
 
                int x = cursor->getPosition().X;
                int y = cursor->getPosition().Y;
                image->setRelativePosition(position2di(x, y));
 
                smgr->drawAll();
                guien->drawAll();
 
                driver->endScene();
        }
 
        device->drop();
 
        return 0;
}
 

does anyone have any suggestion on how to fix it, or should I abandon this method? o.O

edit: put code tags in...sorry

[darksmaster923]

please use code tags

[greenya]

Maybe save the call

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driver->getTexture("../media/cursor.tga")

to a variable, then test it on null.

[darksmaster923]

Going by your post, I assume if you comment out the

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image->setRelativePosition(position2di(x, y));

line it works?

Which line does the error point to, by the way?

[Echilon]

Going by your post, I assume if you comment out the

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image->setRelativePosition(position2di(x, y));

line it works?

yes, that line does work ^^.

Which line does the error point to, by the way?

if I remember correctly, the line that the error was pointing to was a line that was calling the setVisible function, which I took out(quite literally I reverted to an older version of my code).
what happened was that I would change states and the program would freeze, as if it went into an infinite loop. Then I made a few changes which got me the error message.

[Echilon]

Maybe save the call

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driver->getTexture("../media/cursor.tga")

to a variable, then test it on null.

what would I save that call to, what type? and when you say test it on null you mean replace that call with null, correct?

[CuteAlien]

The error message is pretty useless (just tells that you access memory which you shouldn't access). The exact line where it happens is what matters.
And what greenya told you was that you should put the result of driver->getTexture in a variable - and the type is certainly exactly the type which getTexture returns (look it up in the manual). And testing on null simply means you should test in the next line if that variable now contains a valid (non-null) pointer or not. Which you can do with an 'if' - which you either know how to do or you should really, really first work your way through some more c++ tutorials before starting 3D development.

Also on a sidenode... if you update to svn trunk version of Irrlicht you can get support for hardware-cursors including an example which is better as software-cursors are restricted to your framerate.