[SOLVED] IrrlichtDevice Segmentation Fault

[Mitchell M]

Sorry if this is a really dumb question but just when I thought I finally understood pointers I get this problem. Basically what I am having trouble with is that I don't understand how the createDevice works. If I create an IrrlichtDevice *irrlichtDevice and pass that pointer to some function and try to have that function irrlichtDevice = createDevice() then for some reason I can only irrlichtDevice from within that function and if I were to try to do something like while(irrlichtDevice -> run()) in main it gives me a segmentation fault. Is there a way around this. Does the device somehow go out of scope when that function ends?

Basically my problem is this

Code: Select all

 
//main.cpp
IrrlichtDevice *irrlichtDevice;
 
initializer = new Initializer;
initializer -> initializeMasterObjects(irrlichtDevice);
 
//segmentation fault here 
while(device -> run())
{}
 
//Initializer.h
class Initializer
{
    initializerMasterObjects(IrrlichtDevice *irrlichtDevice)
   {
       irrlichtDevice = createDevice( EDT_OPENGL, dimension2d<u32>(800, 600), 16, false, false, false, 0);
   }
 
}
 

Any help would very much be appriciated.

[zerochen]

hi,

yes you are right. you are passing a pointer that points to nothing to the method so it cant "pushed back" to the main scope.

here are 2 alternatives:
first let the method return the created device

second you have to pass a pointer to a pointer like:

Code: Select all

 
//usage
...
initializer -> initializeMasterObjects(&irrlichtDevice);
...
 
//implemetation
...
    initializerMasterObjects(IrrlichtDevice **irrlichtDevice)
   {
       if(irrlichtDevice)
       {
             *irrlichtDevice = createDevice( EDT_OPENGL, dimension2d<u32>(800, 600), 16, false, false, false, 0);
       }
   }
...
 

regards
zerochen

[Mitchell M]

OK I see now thank you so much for your advice and quick response.

Mitchell