a quick newbie question about messages

This is a discussion on a quick newbie question about messages within the Windows Programming forums, part of the Platform Specific Boards category; in the WndProc where u check for all the different messages windows sends your program, why is it that i ...

  1. #1
    Registered User
    Join Date
    May 2002
    Posts
    33

    a quick newbie question about messages

    in the WndProc where u check for all the different messages windows sends your program, why is it that i have made a window that cannot be resized, yet i have code that looks like this.....

    Code:
    		case WM_SIZE:
    		csizex = LOWORD(lParam);
    		csizey = HIWORD(lParam);
    		break;
    if i can't change the size, how does this message get sent to my program?

    is the WM_SIZE message sent on creation of my window? If so, how many other messages get sent to my program on creation of my window?

    Thanks for your time!

    Werdy666

  2. #2
    Unregistered
    Guest
    the wm_size msg is triggered when one trys to resize the window. the wm_create msg is triggered when the window is created. you don't seem to be understanding the msg loop properly, i would explain but i'm VERY lazy right now. but for a quick one, the msg loop handles events so when one trys to resize the window, the wm_size msg is triggered, when the window is created (upon execution) - the wm_create msg is triggered. i'm learning the win api myself and it is well gay.

  3. #3
    Registered User
    Join Date
    May 2002
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    33
    yeah i understand that WM_SIZE is only called when you try to resize the window and WM_Create is called when the window is created....

    here is my message loop...

    Code:
    switch(msg)
    
    	    {
    		case WM_SIZE:
    		csizex = LOWORD(lParam);
    		csizey = HIWORD(lParam);
    		break;
        
        
    		case WM_LBUTTONDOWN:
    		{
    		int mousex = LOWORD(lParam);
    		int mousey = HIWORD(lParam);
    		region = 0;
    		
    		if (mousex < (csizex/2) && mousey <(csizey/2))
    		region = 1;
    		
    		if (mousex > (csizex/2) && mousey <(csizey/2))
    		region = 2;		
    		
    		if (mousex < (csizex/2) && mousey >(csizey/2))
    		region = 3;
    		
    		if (mousex > (csizex/2) && mousey >(csizey/2))
    		region = 4;
    		
    		if (region>0) sprintf(regionbuff,"You clicked in Region %i",region);
    		else sprintf(regionbuff,"You clicked on a line!!!");
    		MessageBox(hwnd,regionbuff,"Region clicked...",MB_OK);
    		}
    		break;
    		
            case WM_CLOSE:
                DestroyWindow(hwnd);
            break;
            case WM_DESTROY:
                PostQuitMessage(0);
            break;
    
            case WM_PAINT:
    		// vertical line        
    		hdc = BeginPaint (hwnd, &ps) ;
            MoveToEx (hdc, (csizex/2), 0, NULL) ;
    		LineTo   (hdc, (csizex/2), csizey ) ;
    		// horizontal line
            MoveToEx (hdc, 0, (csizey/2), NULL) ;
    		LineTo   (hdc, (csizex), (csizey/2) ) ;
    
            default:
                return DefWindowProc(hwnd, msg, wParam, lParam);
        }
    Now if my window has no resize button, how is it that csizex and csizey have values in them from wm_size? my understanding is that WM_SIZE will never be called in my program and therefore should have errors when the mouse button is clicked.

    Basically this program draws to lines to divide the screen into 4 parts and then i detect which part is clicked in.

    And another quick question, if i make a window 800x600 then that is the size of the whole window and not just the client area of the window right?

    Thanks for your time

    Werdy666

  4. #4
    train spotter
    Join Date
    Aug 2001
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    near a computer
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    >>is the WM_SIZE message sent on creation of my window?

    Yes, AFAIK

    >>And another quick question, if i make a window 800x600 then that is the size of the whole window and not just the client area of the window right?

    Yes, use GetWindowRect() to test (is in screen coods)
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