Using Arrow Keys in Windows

This is a discussion on Using Arrow Keys in Windows within the Game Programming forums, part of the General Programming Boards category; First let me tell you what I'm trying to accomplish. I am making a windows app where the user hits ...

  1. #1
    Intranasal Heroin User Xterria's Avatar
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    Using Arrow Keys in Windows

    First let me tell you what I'm trying to accomplish. I am making a windows app where the user hits the up arrow key and somthing happens...obviously I am starting to lean towards a windows game. Anyway, here is my WM_MOVE message, I think this is where my action is:

    Code:
    case WM_MOVE:
             {
             // extract the position
             int xpos = LOWORD(lparam);
             int ypos = HIWORD(lparam);
    
             // get a graphics context
             hdc = GetDC(hwnd);
    
             // set the foreground color to green
             SetTextColor(hdc, RGB(0,255,0));
             
             // set the background color to black
             SetBkColor(hdc, RGB(0,0,0));
             
             // set the transparency mode to OPAQUE
             SetBkMode(hdc, OPAQUE);
    
             // get the up arrow key from the user
             char key=getch();
    		 if(key == VK_UP){
             TextOut(hdc, 0,0, "Hi", strlen("Hi"));
    		 }
             // release the dc back
             ReleaseDC(hwnd, hdc);
    
             } break;
    if I get rid of 'if key == VK_UP' stuff then the Textout thing works. But with it, I press the up arrow key and it doesn't work. Could someone please tell me why? thanks.

  2. #2
    Has a Masters in B.S.
    Join Date
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    look for the WM_KEYDOWN message

    like so...

    case WM_KEYDOWN:
    // the key pressed is stored in wParam
    // do something or set a flag for the key(i recommend the flag and doing the actions elsewhere)

    case WM_KEYUP:
    // the key pressed is stored in wParam
    // reset the flag, or finish what your doing...

  3. #3
    Intranasal Heroin User Xterria's Avatar
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    thanks
    Last edited by Xterria; 10-21-2001 at 03:36 PM.

  4. #4
    Registered User
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    You might also try DirectInput for keyboard handling -- it allows you to capture keystrokes bypassing windows messaging entirely. It would allow you to directly read the state of any key, with less hassle.

  5. #5
    bobish
    Guest
    you can also put this a the top of you program

    #define KEY_DOWN(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0)
    #define KEY_UP(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 0 : 1)

    and then have statements like this
    if (KEY_DOWN(VK_SPACE))
    in your main event loop

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