C / C++ / MFC

26-Aug-10 20:10

Hi!
I've to create a Menu System. I wrote a class for Initial Menu page(which contains 4 buttons) and another class for the next page(e.g when clicking the options button in the initial Menu page). I've crated an object of the second class inside the corresponding button's click event at the first class. Similarly I've created an object of the first class inside the back button's click event of the second class. I've created the device(device is necessary to display the gui elements) at each class's constructors. So my second menu page is loaded in a separate window(device). What to do to load it in the same window?

Niklas L26-Aug-10 22:00

26-Aug-10 22:00

I don't think it's a good design to create a new instance of a menu page every time a menu button is clicked. Think what will happen if the user repeatedly clicks Options, Back, Options, Back, ...
IMO it would be better to just exit from a menu if the back button is clicked, returning to the event handler that created that page in the first place. This way you can reuse your instances, and also easily keep you state / settings.

Now a question for you: What GUI system are you using? Win32 windows / MFC / OpenGL with home made menus / etc. It's impossible to answer your question without this information.

T.RATHA KRISHNAN26-Aug-10 23:05

26-Aug-10 23:05

I'm using Irrlicht Engine.

Niklas L26-Aug-10 23:22

26-Aug-10 23:22

You need to be a bit more specific in your problem descriptions. Are you using a irr::gui::IGUIWindow? What did you try? Do you have a small code snippet to share, showing your problem?

PS. There is a specific irrlicht forum here[^]. They might be better at answering your questions.

T.RATHA KRISHNAN26-Aug-10 23:29

26-Aug-10 23:29

Hi!
This is my initial Menu class.

#include <irrlicht.h> 
#include "../include/InitMenu.h" 
#include "../include/OptionsMenu.h" 
#include <stdio.h> 
#include <stdlib.h> 

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

class COptionsMenu; 
InitEventReceiver::InitEventReceiver(SInitMenuContext &context):initMenuContext(context) 
{ 

} 

bool InitEventReceiver::OnEvent(const irr::SEvent& event) 
{ 
 if (event.GUIEvent.EventType == gui::EGET_BUTTON_CLICKED) 
 { 
  s32 idBtn = event.GUIEvent.Caller->getID(); 
  switch(idBtn) 
  { 
   case PLAY_BUTTON: 
      return true; 
      break; 
   case OPTIONS_BUTTON: 
      { 
       COptionsMenu *optMNU = new COptionsMenu(); 
      optMNU->runGame(); 
      initMenuContext.device->closeDevice(); 
      return true; 
      break; 
      } 
   case CREDITS_BUTTON: 
      return true; 
      break; 
   case EXIT_BUTTON: 
      initMenuContext.device->closeDevice(); 
      break; 
      return true; 
   default: 
      return false; 
  } 
  return true; 
 } 
 return false; 
} 

CInitMenu::CInitMenu() 
{ 
 IrrlichtDevice* device = createDevice(video::EDT_DIRECT3D9,core::dimension2d<u32>(640,480),16,false,false,false,0); 
 dev = device; 
 int width = 180; 
 int height = 50; 
 int x = (device->getVideoDriver()->getScreenSize().Width - 200)/2; 
 int y = 100; 
 SColor WHITE = video::SColor(255,255,255,255); 
 SColor BLUE = video::SColor(255,0,0,255); 
 gui::IGUISkin* skin = device->getGUIEnvironment()->createSkin(EGUI_SKIN_TYPE::EGST_WINDOWS_METALLIC); 
 skin->setColor(gui::EGDC_BUTTON_TEXT,WHITE); 
 skin->setColor(gui::EGDC_WINDOW,BLUE); 
 device->getGUIEnvironment()->setSkin(skin); 
 device->getSceneManager()->loadScene("Data/experimentalMenuSystem/Shop.irr"); 
 device->getSceneManager()->addCameraSceneNode(0,core::vector3df(0,100,0),core::vector3df(0,0,100),-1,true); 
 m_pPlayButton = device->getGUIEnvironment()->addButton(core::recti(x,y,x+width,y+height),0,PLAY_BUTTON,L"Play"); 
 y = y+height; 
 m_pOptionsButton = device->getGUIEnvironment()->addButton(core::recti(x,y,x+width,y+height),0,OPTIONS_BUTTON,L"Options"); 
 y = y+height; 
 m_pCreditsButton = device->getGUIEnvironment()->addButton(core::recti(x,y,x+width,y+height),0,CREDITS_BUTTON,L"Credits"); 
 y = y+height; 
 m_pExitButton = device->getGUIEnvironment()->addButton(core::recti(x,y,x+width,y+height),0,EXIT_BUTTON,L"Exit"); 
 initMnuContext.device = device; 
 initMnuContext.m_pPlayButton = m_pPlayButton; 
 initMnuContext.m_pOptionsButton = m_pOptionsButton; 
 initMnuContext.m_pCreditsButton = m_pCreditsButton; 
 initMnuContext.m_pExitButton = m_pExitButton; 
} 
int main(int argc, char **argv) 
{ 
 CInitMenu* cIMNU = new CInitMenu(); 
 cIMNU->runGame(); 
} 

void CInitMenu::runGame() 
{ 
 InitEventReceiver initReceiver(initMnuContext); 
 dev->setEventReceiver(&initReceiver); 
 while(dev->run()) 
 { 
  if (dev->isWindowActive()) 
  { 
   dev->getVideoDriver()->beginScene(true, true, video::SColor(0,200,200,200)); 
   dev->getSceneManager()->drawAll(); 
   dev->getGUIEnvironment()->drawAll(); 
   dev->getVideoDriver()->endScene(); 
  } 
 } 
 dev->drop(); 
}

This is Options Menu class:

#include <irrlicht.h> 
#include "../include/OptionsMenu.h" 
#include "../include/InitMenu.h" 

//CInitMenu cIMNU; 
using namespace irr; 
using namespace core; 
using namespace video; 
using namespace gui; 
using namespace io; 
using namespace scene; 

OptionsEventReceiver::OptionsEventReceiver(SOptionsContext &optionsContext):OptionsContext(optionsContext) 
{ 

} 

bool OptionsEventReceiver::OnEvent(const irr::SEvent& event) 
{ 
 if (event.GUIEvent.EventType == gui::EGET_BUTTON_CLICKED) 
 { 
  s32 idBtn = event.GUIEvent.Caller->getID(); 
  printf("Button Clicked: %d \n",idBtn); 
  switch(idBtn) 
  { 
   case PROFILE_BUTTON: 
      return true; 
      break; 
   case FAVOURITES_BUTTON: 
      return true; 
      break; 
   case MATCH_RESULT_BUTTON: 
      return true; 
      break; 
   case  OPTIONS_BACK_BUTTON: 
      { 
       CInitMenu *cInitMNU  = new CInitMenu(); 
      cInitMNU->runGame(); 
      OptionsContext.device->closeDevice(); 
       return true; 
      break; 
      } 
   default: 
       return false; 
  } 
  return false; 
 } 
} 

COptionsMenu::COptionsMenu() 
{ 
 IrrlichtDevice* device = createDevice(video::EDT_DIRECT3D9,core::dimension2d<u32>(640,480),16,false,false,false,0); 
 dev = device; 
 int width = 180; 
 int height = 50; 
 int x = (device->getVideoDriver()->getScreenSize().Width - 200)/2; 
 int y = 100; 
 SColor WHITE = video::SColor(255,255,255,255); 
 SColor BLUE = video::SColor(255,0,0,255); 
 gui::IGUISkin* skin = device->getGUIEnvironment()->createSkin(EGUI_SKIN_TYPE::EGST_WINDOWS_METALLIC); 
 skin->setColor(gui::EGDC_BUTTON_TEXT,WHITE); 
 skin->setColor(gui::EGDC_WINDOW,BLUE); 
 device->getGUIEnvironment()->setSkin(skin); 
 device->getSceneManager()->loadScene("Data/experimentalMenuSystem/Shop.irr"); 
 device->getSceneManager()->addCameraSceneNode(0,core::vector3df(0,100,0),core::vector3df(0,0,100),-1,true); 
 m_pPlayerProfileButton = device->getGUIEnvironment()->addButton(recti(x,y,x+width,y+height),0,PROFILE_BUTTON,L"Player Profile"); 
 y = y+height; 
 m_pFavouritesButton = device->getGUIEnvironment()->addButton(recti(x,y,x+width,y+height),0,FAVOURITES_BUTTON,L"Favorites"); 
 y = y+height; 
 m_pMatchResultButton = device->getGUIEnvironment()->addButton(recti(x,y,x+width,y+height),0,MATCH_RESULT_BUTTON,L"Match Result"); 
 m_pOptionsBackButton = device->getGUIEnvironment()->addButton(recti(0,400,192,458),0,OPTIONS_BACK_BUTTON,L"Back"); 
 optionsContext.device = device; 
 optionsContext.m_pPlayerProfileButton = m_pPlayerProfileButton; 
 optionsContext.m_pFavouritesButton = m_pFavouritesButton; 
 optionsContext.m_pMatchResultButton = m_pMatchResultButton; 
 optionsContext.m_pOptionsBackButton = m_pOptionsBackButton; 
} 

void COptionsMenu::runGame() 
{ 
 OptionsEventReceiver optReceiver(optionsContext); 
 dev->setEventReceiver(&optReceiver); 
 while(dev->run()) 
 { 
  if (dev->isWindowActive()) 
  { 
   dev->getVideoDriver()->beginScene(true, true, video::SColor(0,200,200,200)); 
   dev->getSceneManager()->drawAll(); 
   dev->getGUIEnvironment()->drawAll(); 
   dev->getVideoDriver()->endScene(); 
  } 
 } 
 dev->drop(); 
}

Niklas L27-Aug-10 1:09

27-Aug-10 1:09

There are some basic issues with your code.

case EXIT_BUTTON:
   initMenuContext.device->closeDevice();
   break;
   return true;

You don't need both break and return. Especially not in this order. You are only making it harder for yourself to follow the program flow.

This

SColor WHITE = video::SColor(255,255,255,255);

is the same as

SColor WHITE(255,255,255,255);

Don't type more than you have to to keep readability.

This

CInitMenu* cIMNU = new CInitMenu();
cIMNU->runGame();

will leak memory and should be written something like

CInitMenu().runGame();

even though I think having the main menu as the object root of your app is a bit skewed.

Now, why do you want the new menu appear in the same window? It looks like the GUI system is designed for having child dialogs. An alternative could be to use their tab control.

If you still need to open the menu in the same window, I see no other alternative than to remove (or hide) the original controls, and insert your new ones. But don't take my word for it. I have only seen the GUI classes for about 5 minutes. Ask for a solution in the other forum I gave a link to.

T.RATHA KRISHNAN27-Aug-10 2:08

27-Aug-10 2:08

Ok. Can you help me to write the above classes using singleton? Instead of creating a device at each class's constructor, I've to create only one device and use it for any gui classes in my menu implementation. Is this the correct way to solve my problem?

Niklas L27-Aug-10 2:45

27-Aug-10 2:45

T.RATHA KRISHNAN wrote:
Can you help me to write the above classes using singleton?

No.

If you want access to the device through a singleton class, you can read how it's done
right here[^] Since you don't need a thread safe singleton, it's one of the easiest patterns to implement.

If its the correct way or not, I have no idea. One idea is that you ask in the irrlicht forum I think I gave you a link to.

unresolved external symbol in TAPI prog

AmbiguousName26-Aug-10 10:46

AmbiguousName

26-Aug-10 10:46

hello guys...im VERY new to this. I have a button on the form inwhich im calling the basic lineInitializeEx function...but the code is not compiling and showing two error

1) unresolved external symbol_lineInitializeExA referenced in function ....
2) unresolved externals

Here is the code im using..

HLINEAPP lineApp;
HANDLE   TapiEvent;
HLINE    hLine;
HCALL    hCall;
LINEINITIALIZEEXPARAMS LineInitializeExParams;
LONG     result;
DWORD    tapiVersion;
DWORD    numDevs;

	//set the tapi veriosn
	tapiVersion = 0x00020000;

	//create the event first..
	EventReply = CreateEvent(NULL,FALSE,FALSE,NULL);

	//clear the structure before the usage
	memset(&LineInitializeExParams,0,sizeof(LINEINITIALIZEEXPARAMS));

	//populate the options
	LineInitializeExParams.dwTotalSize = sizeof(LINEINITIALIZEEXPARAMS);
	LineInitializeExParams.dwOptions = LINEINITIALIZEEXOPTION_USEEVENT;

	//call the LineInitializeEx function
	result = lineInitializeEx(&lineApp,NULL,NULL,"CallTest",&numDevs,&tapiVersion,&LineInitializeExParams);
	if (result!=0) {
		//MessageBox(NULL,"somthing went wrong","",NULL);
		MessageBox("somtehing went wrong");
	}

what can be the problem Confused | :confused:

thanx for ur thoughts

Niklas L26-Aug-10 11:29

26-Aug-10 11:29

This is a linker error. It lets you know that the function lineInitializeEx is not defined. Its implementation is missing. In this case you have forgotten to link against the tapi32.lib.

AmbiguousName26-Aug-10 23:09

AmbiguousName

26-Aug-10 23:09

thanx alot..

«_Superman_»26-Aug-10 17:45

«_Superman_»

26-Aug-10 17:45

As Niklas Lindquist said you need to link against the tapi library.
You can do the following -

Add #pragma comment(lib, "tapi32") in stdafx.h or any other file.
OR
Add tapi32.lib in Project -> Properties -> Configuration Properties -> Linker -> Input -> Additional Dependencies.

«_Superman_»

I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Niklas L26-Aug-10 20:36

26-Aug-10 20:36

There is actually a third alternative: You can add the lib file to your project tree.

AmbiguousName26-Aug-10 23:37

AmbiguousName

26-Aug-10 23:37

thanx...i wanted to ask that I have not been ab;e to understand the purpose of #pragma...why do we use it?? well i have google it but could not find proper answer.

Intel IPP static libs addition to the project

wsauer27-Aug-10 15:01

wsauer

27-Aug-10 15:01

http://msdn.microsoft.com/en-us/library/d9x1s805.aspx[^]

According to that page: "Pragma directives specify machine- or operating-specific compiler features". There are a whole bunch of pragmas for various uses. In this case, somehow the compiler emits a string that later tells the linker to link in some lib. I'm not sure I like this idea very much, because sometimes the order in which you specify .lib files matter. In that case, it's easier to just use the project settings. gcc seems to have a number of architecture specific pragmas[^]. In their page, they have the following to say: "Note that in general we do not recommend the use of pragmas".

Chesnokov Yuriy26-Aug-10 10:15

Chesnokov Yuriy

26-Aug-10 10:15

Anyone tried Intel IPP libs with Multithreaded static linkage with dispatching?

I've got those link errors:

1>LIBCMTD.lib(dbgheap.obj) : error LNK2005: __malloc_dbg already defined in MSVCRTD.lib(MSVCR100D.dll)
1>LIBCMTD.lib(sprintf.obj) : error LNK2005: _sprintf already defined in MSVCRTD.lib(MSVCR100D.dll)
1>LIBCMTD.lib(crt0dat.obj) : error LNK2005: _exit already defined in MSVCRTD.lib(MSVCR100D.dll)
...

These are the libs I added as described in manual:

ippccemerged.lib
ippccmerged_t.lib
ippiemerged.lib
ippimerged_t.lib
ippjemerged.lib
ippjmerged_t.lib
ippcore_t.lib
ippsemerged.lib
ippsmerged_t.lib
libiomp5mt.lib
libirc.lib

However with non-multithreaded static linkage without libiomp5mt.lib all compiles perfectly

Чесноков

Re: Intel IPP static libs addition to the project

Niklas L26-Aug-10 11:38

26-Aug-10 11:38

Look at the discussion here[^]. Similar problem, and the reason was a mix of debug and release builds.

Hope that helps.