Thread: More Class Help

Hello Again, I was hoping to get somemore class help, though this may fall under the inheritance tab as well.

I have two classes Class Config, and class Gui (which is a derived class of Config)
Now to access a public variable in Config, must I reference config or can I just treat it as though it were a public variable of the Gui Class. For example, device is a public pointer in the Config class. Within my Gui constructor I reference it, please let me know if this is being done properly because when I try and call a function (even with everything in the function being commented out) I get a segmentation fault and I just cannot locate where it is occuring.

Code:

Gui::Gui(){

  env = device->getGUIEnvironment();
  prefenv = device->getGUIEnvironment();
  if(!env)
{
    printf("oopsie, env is bad.\n");
    return;
}
if(!prefenv)
{
    printf("oopsie, prefenv is bad.\n");
    return;
}
  
}

Shure any public or protected member variable can be accessed by your derived class.
We would have to see some code to tell you exactly why your Gui constructor segfaults. ( if you get that far as to a segfault your program has to be syntactically correct ).
But keep in mind that in the constructor of Gui only the members of Config that are initialized in Config's constructor ( default constructor in this case ) are valid.
Kurt

Ok, well I can post some code, but it is not actually my constructor which is seg faulting it is a call to a method within the GUI class. In an attempt to find the error I have commented out everything in the fucntion who's call is causing the seg. fault. and it is still occuring. I will post both of my classes here however.

Code:

class Config {
public:
// Variables
  core::stringw HelpText;
  int header;
  stringc str1, str2, str3, c1, c2, c3, c4;
  int header_lines, format_cols, driverType_int;
  IrrlichtDevice *device;
  ISceneManager* smgr;
  IVideoDriver* driver;
  video::E_DRIVER_TYPE driverType;

// Functions
	      Config();
	     ~Config();
   void ReadXML(void);
   void writeConfigFile();
   void updatePref();
};

Code:

class Gui : public Config  {
public:
// Variables
  IGUIStaticText* fpstext;
  IGUIStaticText* timetext;
  IGUIStaticText* frametext;
  IGUIEnvironment* env;
  IGUIEnvironment* prefenv;
    
     	Gui();
	   ~Gui();
 void createGUI();
 void showPref();
 void showAboutText();
 
};

This is the function which is causing the seg. fault.

Code:

void Gui::createGUI()
{ /*printf("Creating GUI..\n");
  //IGUIToolBar* bar = env->addToolBar();
  printf("Toolbar Created..\n");
  //env->addStaticText(L"Constant Path: ", core::rect<s32>(8,10,90,25), false);
  //IGUIEditBox* namebox = env->addEditBox(L"Test/X", core::rect<s32>(100,8,240,25), true, bar, 901);
  printf("Const. Path Box Created..\n");
  //env->addStaticText(L"Start#:", core::rect<s32>(250,10,300,25), false);
  //IGUIEditBox* range1box = env->addEditBox(L"1", core::rect<s32>(310,8,350,25), true, bar, 902);
  printf("Range1 Box Created..\n");
  //env->addStaticText(L"End#: ", core::rect<s32>(360,10,410,25), false);
  //IGUIEditBox* range2box = env->addEditBox(L"1", core::rect<s32>(420,8,470,25), true, bar, 903);
  printf("Range2 Box Created..\n");
  //IGUICheckBox* sphere_check_box = env->addCheckBox (true,core::rect<s32>(490,8,510,25) , bar, 400, L"Spheres");
  //IGUICheckBox* box_check_box = env->addCheckBox (false,core::rect<s32>(530,8,550,25), bar, 400, L"Boxes");
  printf("Check Boxes Created..\n");
  //IGUIButton* launchbutton = env->addButton(core::rect<s32>(570,8,600,25), bar, 1101, L"Launch");
  printf("Launch Button Created..\n");
  //fpstext = env->addStaticText(L"", core::rect<s32>(850,8,900,25), true);
  //timetext = env->addStaticText(L"", core::rect<s32>(910,8,1010,25), true);
  //frametext = env->addStaticText(L"", core::rect<s32>(1020,8,1150,25), true);
  printf("Static Text's Created..\n");

  //IGUIButton* helpbutton = env->addButton(core::rect<s32>(1750,8,1790,25), bar, 1102, L"Help");
  //IGUIButton* prefbutton = env->addButton(core::rect<s32>(1650,8,1740,25), bar, 1103, L"Preferences");
  printf("Help and Pref. Buttons Created..\n");



  //IGUISkin* skin = env->getSkin();
  printf("Got Skin..\n");
  //IGUIFont* font = env->getFont("../include/fonthaettenschweiler.bmp");
  printf("Got Font..\n");

    //skin->setFont(font);
    printf("Font Set..\nBeginning Alpha Loop\n");

  	//for (s32 k=0; k<gui::EGDC_COUNT ; k++)
	//{
 	//	SColor col = env->getSkin()->getColor((gui::EGUI_DEFAULT_COLOR)k);
	//	col.setAlpha(255);
	//	env->getSkin()->setColor((gui::EGUI_DEFAULT_COLOR)k, col);
	//}
  printf("Alpha Loop Finshed..\n");


  stringw capstr = L"Visualization";
  //device->setWindowCaption(capstr.c_str());
  printf("Window Caption Set..\nGUI Finished\n"); */

}

and it is being called like follows in main.cpp

Code:

Gui interface;

interface.createGUI();

I was doing some thinking, and I think I may have figured this out. I have a question first though, when I create an instance of Gui I reconstruct config as well correct? In my main function I am using an instance of Config do control my devices and the like, and I think, if I am correct, when I call an instance of Gui I am pointing to a different device then I am using. Example below in psuedo.....

Using the classes above...

Code:

Config config;
Gui interface;

config.device->run()
interface->createGUI();

Now the variable in create GUI called 'env', actually points to 'device' in config during intialization. Would these two instances point to the same device?? Because if not then I think I found the fault

Well I got rid of the instance of config in my Main.cpp, however I still get this fault. Which strikes me as odd because I figured this to be the answer.