Button Problem Please Help

This is a discussion on Button Problem Please Help within the C Programming forums, part of the General Programming Boards category; I want one of my buttons to toggle between On and Off, i mean when i click on On it ...

  1. #1
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    Unhappy Button Problem Please Help

    I want one of my buttons to toggle between On and Off, i mean when i click on On it must turn Off when i click on Off it must turn on, how can i do that?

  2. #2
    and the hat of int overfl Salem's Avatar
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    Maybe state which OS/Compiler/GUI Toolkit you're using?

    Or maybe post the code you have to draw the button in the first place.

    http://www.catb.org/~esr/faqs/smart-questions.html
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  3. #3
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    Talking

    Dev C++, Windows

    I want it to toggle between "Durdur" and "Calistir"
    Code:
    #include <windows.h>
    
    LRESULT CALLBACK PencereProseduru (HWND, UINT, WPARAM, LPARAM);
    
    
    char YapiSinifAdi[ ] = "WindowsApp";
    HWND DugmeTutmaci;
    HMENU Yavru1;
    int WINAPI WinMain (HINSTANCE AnaFonksiyonTutmaci, HINSTANCE hPrevInstance, LPSTR lpszArgument, int nFunsterStil)
    
    {
        HWND AnaPencereTutmaci;           
        MSG Mesajlar;                     
        WNDCLASSEX PencereYapisi;   
    
        PencereYapisi.hInstance = AnaFonksiyonTutmaci;
        PencereYapisi.lpszClassName = YapiSinifAdi;
        PencereYapisi.lpfnWndProc = PencereProseduru;      
        PencereYapisi.style = CS_DBLCLKS;                 
        PencereYapisi.cbSize = sizeof (WNDCLASSEX);
    
        PencereYapisi.hIcon = LoadIcon (NULL, IDI_APPLICATION);
        PencereYapisi.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
        PencereYapisi.hCursor = LoadCursor (NULL, IDC_ARROW);
        PencereYapisi.lpszMenuName = NULL;             
        PencereYapisi.cbClsExtra = 0;                
        PencereYapisi.cbWndExtra = 0;            
        
        PencereYapisi.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
    
        if (!RegisterClassEx (&PencereYapisi))
            return 0;
    
        AnaPencereTutmaci = CreateWindowEx (
               0,                   
               YapiSinifAdi,       
               "Windows App",       
               WS_OVERLAPPEDWINDOW, 
               CW_USEDEFAULT,      
               CW_USEDEFAULT,      
               544,                 
               375,                 
               HWND_DESKTOP,        
               NULL,                
               AnaFonksiyonTutmaci, 
               NULL               
               );
        DugmeTutmaci = CreateWindowEx (
               0,
               "button",
               "Durdur",
               WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
               1,      
               1,       
               170,      
               30,   
               AnaPencereTutmaci,
               (HMENU)1,
               AnaFonksiyonTutmaci,
               NULL
               );
               
        ShowWindow (AnaPencereTutmaci, nFunsterStil);
    
        while (GetMessage (&Mesajlar, NULL, 0, 0))
        {
            TranslateMessage(&Mesajlar);
    
            DispatchMessage(&Mesajlar);
        }
    
        return Mesajlar.wParam;
    }
    
    LRESULT CALLBACK PencereProseduru (HWND AnaPencereTutmaci, UINT message, WPARAM wParam, LPARAM lParam)
    {   
            LPSTR Icerik;
        switch (message)         
        {   case WM_COMMAND:
                 if(LOWORD(wParam) == 1 && HIWORD(wParam) == BN_CLICKED)
                        {
                           GetWindowText(DugmeTutmaci, Icerik, sizeof(Icerik)+1);
                           if (Icerik == "Durdur")
                           {SetWindowText (DugmeTutmaci,"Calistir");
                           break;}
                           else
                           {SetWindowText (DugmeTutmaci, "Durdur");
                           break;}
                        }
                        break;                              
            case WM_DESTROY:
                PostQuitMessage (0);  
                break;
            default:  
                return DefWindowProc (AnaPencereTutmaci, message, wParam, lParam);
        }
    
        return 0;
    }
    Last edited by hileci555; 07-10-2008 at 02:17 PM. Reason: added code

  4. #4
    and the hat of int overfl Salem's Avatar
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    > LPSTR Icerik;
    This needs to be a STR (specifically an array of them), not merely an uninitialised pointer.

    > GetWindowText(DugmeTutmaci, Icerik, sizeof(Icerik)+1);
    Be honest about the size of things you're referring to. Adding 1 is unlikely to be a good idea.

    > if (Icerik == "Durdur")
    Use strcmp() to compare strings.
    Unless of course you've compiled your code with UNICODE enabled (I don't think dev-c++ defaults to unicode at the moment), so you may be OK.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  5. #5
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    6

    Unhappy

    Thanks for the reply here is the working code:
    Code:
    #include <windows.h>
    
    LRESULT CALLBACK PencereProseduru (HWND, UINT, WPARAM, LPARAM);
    
    
    char YapiSinifAdi[ ] = "WindowsApp";
    HWND DugmeTutmaci;
    HMENU Yavru1;
    int WINAPI WinMain (HINSTANCE AnaFonksiyonTutmaci, HINSTANCE hPrevInstance, LPSTR lpszArgument, int nFunsterStil)
    
    {
        HWND AnaPencereTutmaci;           
        MSG Mesajlar;                     
        WNDCLASSEX PencereYapisi;   
    
        PencereYapisi.hInstance = AnaFonksiyonTutmaci;
        PencereYapisi.lpszClassName = YapiSinifAdi;
        PencereYapisi.lpfnWndProc = PencereProseduru;      
        PencereYapisi.style = CS_DBLCLKS;                 
        PencereYapisi.cbSize = sizeof (WNDCLASSEX);
    
        PencereYapisi.hIcon = LoadIcon (NULL, IDI_APPLICATION);
        PencereYapisi.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
        PencereYapisi.hCursor = LoadCursor (NULL, IDC_ARROW);
        PencereYapisi.lpszMenuName = NULL;             
        PencereYapisi.cbClsExtra = 0;                
        PencereYapisi.cbWndExtra = 0;            
        
        PencereYapisi.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
    
        if (!RegisterClassEx (&PencereYapisi))
            return 0;
    
        AnaPencereTutmaci = CreateWindowEx (
               0,                   
               YapiSinifAdi,       
               "Windows App",       
               WS_OVERLAPPEDWINDOW, 
               CW_USEDEFAULT,      
               CW_USEDEFAULT,      
               544,                 
               375,                 
               HWND_DESKTOP,        
               NULL,                
               AnaFonksiyonTutmaci, 
               NULL               
               );
        DugmeTutmaci = CreateWindowEx (
               0,
               "button",
               "Durdur",
               WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
               1,      
               1,       
               170,      
               30,   
               AnaPencereTutmaci,
               (HMENU)1,
               AnaFonksiyonTutmaci,
               NULL
               );
               
        ShowWindow (AnaPencereTutmaci, nFunsterStil);
    
        while (GetMessage (&Mesajlar, NULL, 0, 0))
        {
            TranslateMessage(&Mesajlar);
    
            DispatchMessage(&Mesajlar);
        }
    
        return Mesajlar.wParam;
    }
    
    LRESULT CALLBACK PencereProseduru (HWND AnaPencereTutmaci, UINT message, WPARAM wParam, LPARAM lParam)
    {   
            char Icerik[256];
        switch (message)         
        {   case WM_COMMAND:
                 if(LOWORD(wParam) == 1 && HIWORD(wParam) == BN_CLICKED)
                        {
                           GetWindowText(DugmeTutmaci, Icerik, sizeof(Icerik)+11);
                           if (strcmp(Icerik, "Durdur")== 0) 
                           {SetWindowText (DugmeTutmaci,"Calistir");
                           break;}
                           else
                           {SetWindowText (DugmeTutmaci, "Durdur");
                           break;}
                        }
                        break;                              
            case WM_DESTROY:
                PostQuitMessage (0);  
                break;
            default:  
                return DefWindowProc (AnaPencereTutmaci, message, wParam, lParam);
        }
    
        return 0;
    }
    Last edited by hileci555; 07-10-2008 at 05:50 PM. Reason: It is liviiiing

  6. #6
    and the hat of int overfl Salem's Avatar
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    > sizeof(Icerik)+11
    I said DELETE the addition, not make it bigger?

    What if you really have more chars than will fit, and you lie about the buffer size?
    Trashed stack, random crashing and "Huh?" posted on message boards is what awaits you.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  7. #7
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    Sep 2006
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    8,868
    Quote Originally Posted by Salem View Post
    > sizeof(Icerik)+11
    I said DELETE the addition, not make it bigger?

    What if you really have more chars than will fit, and you lie about the buffer size?
    Trashed stack, random crashing and "Huh?" posted on message boards is what awaits you.
    Now you've done it, Salem. He'll make it +21, next time.

  8. #8
    and the hat of int overfl Salem's Avatar
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    Well it's a good example of how "working" != "bug free"
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  9. #9
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    Cool

    Quote Originally Posted by Salem View Post
    Well it's a good example of how "working" != "bug free"
    Hehe, that's a good one.

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