help handling checkbox

This is a discussion on help handling checkbox within the Windows Programming forums, part of the Platform Specific Boards category; in my switch message i have Code: case WM_COMMAND: switch(LOWORD(wParam)) { case IDC_CHECK: MessageBox(NULL,"Ticked","",0); break; } break; //styles for button ...

  1. #1
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    help handling checkbox

    in my switch message i have
    Code:
    case WM_COMMAND:
    		switch(LOWORD(wParam))
    		{
    		case IDC_CHECK: MessageBox(NULL,"Ticked","",0); break;
    		}
    	break;
    
    //styles for button
     WS_CHILD  | BS_CHECKBOX | BS_AUTO3STATE | WS_CLIPCHILDREN,
    but when i go to untick the checkbox , it does the messagebox again , so something cant be right

  2. #2
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    How are you creating your check boxes? Are you using CreateWindowEx or are you using a resource script?

  3. #3
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    Scranton, Pa
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    You've got one argument there; was the control clicked? The answer is always yes. You need to check the state of the checkbox, whether checked or unchecked.

    Code:
    if checked {
     //do this
     }
     else {
    
     //do something else
     }

  4. #4
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    One possible option...


    Code:
    BOOL bIsChecked;
    
    hCheck = CreateWindow ("BUTTON", "Check Box",
        WS_CHILD | BS_AUTO3STATE,
        20, 120, 110, 20,
        hWnd, (HMENU)IDC_CHECK, hInstance, NULL) ;
    
    case WM_COMMAND:
        switch(LOWORD(wParam))
        {
            case IDC_CHECK:
                bIsChecked = SendMessage (hCheck, BM_GETCHECK, 0, 0) ;
                if(bIsChecked)
                    MessageBox (hWnd, "CheckBox Checked", "CheckBox status", MB_OK) ;
                else
                    MessageBox (hWnd, "CheckBox UnChecked", "CheckBox status", MB_OK) ;
    
                break;
        }
    break;

  5. #5
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    the create window is in the winmain code , ive added a second button but that just effects using button one now , heres my switch

    Code:
    #include "stdafx.h"
    #include "ProxyLoaderGui.h"
    #include <windows.h>
    
    
    
    LRESULT WINAPI WndProc(HWND hWnd,UINT msg,WPARAM wParam,LPARAM lParam);
    void RegisterWindowClass(HINSTANCE hInstance);
    void CreateAppWindow(HINSTANCE hInstance);
    void CreateButtonWindow(HINSTANCE hInstance,HWND hWnd);
    void CreateStartWindow(HINSTANCE hInstance,HWND hWnd);
    WPARAM StartMessageLoop();
    
    HWND g_hWnd;
    HWND g_hButton;
    HWND g_hStart;
    int Result;
    
    #define IDC_CHECK 1001
    #define IDC_START 1002
    
    INT WINAPI WinMain(HINSTANCE hInstance,HINSTANCE,LPSTR,INT)
    {
    	RegisterWindowClass(hInstance);
    	CreateAppWindow(hInstance);
    	CreateButtonWindow(hInstance,g_hWnd);
    	CreateStartWindow(hInstance,g_hWnd);
    
    	ShowWindow(g_hWnd,SW_SHOWDEFAULT);
    	ShowWindow(g_hButton,SW_SHOWDEFAULT);
    	ShowWindow(g_hStart,SW_SHOWDEFAULT);
    
    	UpdateWindow(g_hWnd);
    	UpdateWindow(g_hButton);
    	UpdateWindow(g_hStart);
    	INT result = StartMessageLoop();
    	return result;
    }
    
    LRESULT WINAPI WndProc(HWND hWnd,UINT msg,WPARAM wParam,LPARAM lParam)
    {
    	switch(msg)
    	{
    	case WM_CREATE:
    		return 0;
    
    	case WM_COMMAND:
    		switch(LOWORD(wParam))
    		{
    		case IDC_CHECK: 
    			Result = SendMessage(g_hButton,BM_GETCHECK,0,0); 
    			if(Result == BST_CHECKED)
    			{
    				MessageBox(NULL,"BST_CHECKED","",0); 
    				break;
    			}
    			if(Result == BST_INDETERMINATE)
    			{
    				MessageBox(NULL,"BST_INDETERMINATE","",0); 
    				break;
    			}
    			if(Result == BST_UNCHECKED)
    			{
    				MessageBox(NULL,"BST_UNCHECKED","",0); 
    				break;
    			}
    		break;
    
    	   // case IDC_START: MessageBox(NULL,"Pressed","",0); break;
    
    			
    		}
    	break;
    
    	case WM_DESTROY:
    		PostQuitMessage(0);
    		return 0;
    
    	case WM_PAINT:
    		ValidateRect(g_hWnd,NULL);
    		ValidateRect(g_hButton,NULL);
    		ValidateRect(g_hStart,NULL);
    
    		RedrawWindow(g_hWnd,NULL,NULL,RDW_INVALIDATE);
    		RedrawWindow(g_hButton,NULL,NULL,RDW_INVALIDATE);
    		RedrawWindow(g_hStart,NULL,NULL,RDW_INVALIDATE);
    		return 0;
    	}
    	return DefWindowProc(hWnd,msg,wParam,lParam);
    }
    
    void RegisterWindowClass(HINSTANCE hInstance)
    {
    	WNDCLASSEX wc;
    	wc.cbSize = sizeof(WNDCLASSEX);
    	wc.style = CS_HREDRAW | CS_HREDRAW | CS_OWNDC;
    	wc.lpfnWndProc = WndProc;
    	wc.cbWndExtra = 0;
    	wc.cbClsExtra = 0;
    	wc.hInstance = hInstance;
    	wc.hIcon = LoadIcon(NULL,IDI_APPLICATION);
    	wc.hCursor = (HCURSOR)LoadCursor(NULL,IDC_ARROW);
    	wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    	wc.lpszMenuName = "MainWin";
    	wc.lpszClassName = "WinApp";
    	wc.hIconSm = NULL;
    
    	RegisterClassEx(&wc);
    }
    
    void CreateAppWindow(HINSTANCE hInstance)
    {
    	g_hWnd = CreateWindowEx(WS_EX_TOOLWINDOW,
    		                "WinApp",
    	 "Basic Windows Application",
    	         WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN,
    			 100,
    			 100,
    			 648,
    			 514,
    			 GetDesktopWindow(),
    			 NULL,
    			 hInstance,
    			 NULL);
    }
    
    void CreateButtonWindow(HINSTANCE hInstance,HWND hWnd)
    {
    	g_hButton = CreateWindowEx(NULL,
    		                "BUTTON",
    	               "Button",
    	         WS_CHILD  | BS_CHECKBOX | BS_AUTO3STATE | WS_BORDER,
    			 0,
    			 0,
    			 100,
    			 100,
    			 hWnd,
    			 (HMENU)IDC_CHECK,
    			 hInstance,
    			 NULL);
    }
    
    void CreateStartWindow(HINSTANCE hInstance,HWND hWnd)
    {
    	g_hStart = CreateWindowEx(NULL,
    		                "BUTTON",
    	               "Start",
    	         WS_CHILD | WS_BORDER,
    			 200,
    			 0,
    			 100,
    			 100,
    			 hWnd,
    			 (HMENU)IDC_START,
    			 hInstance,
    			 NULL);
    }
    
    WPARAM StartMessageLoop()
    {
    	MSG msg;
    	while(1)
    	{
    		if(PeekMessage(&msg,NULL,0,0,PM_REMOVE))
    		{
    			if(msg.message == WM_QUIT)
    				break;
    			TranslateMessage(&msg);
    			DispatchMessage(&msg);
    		}
    		else
    		{
    
    		}
    	}
    	return msg.wParam;
    }
    now the first is not working and not saying clicked etc after i add IDC_START
    Last edited by Anddos; 04-04-2009 at 12:01 AM.

  6. #6
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    Hmmm, the message box is showed, but behind the program window
    Try using the main window handle to attach the alert window instead a null handle.

    Niara

  7. #7
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    Your problem lies in the WM_PAINT routine. Comment it out as follows and the app will identify the different states of the checkbox.


    Code:
    	case WM_DESTROY:
    		PostQuitMessage(0);
    		return 0;
    #ifdef BAD
    	case WM_PAINT:
    		ValidateRect(g_hWnd,NULL);
    		ValidateRect(g_hButton,NULL);
    		ValidateRect(g_hStart,NULL);
    
    		RedrawWindow(g_hWnd,NULL,NULL,RDW_INVALIDATE);
    		RedrawWindow(g_hButton,NULL,NULL,RDW_INVALIDATE);
    		RedrawWindow(g_hStart,NULL,NULL,RDW_INVALIDATE);
    		return 0;
    #endif
    	}
    	return DefWindowProc(hWnd,msg,wParam,lParam);

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