key pressed

This is a discussion on key pressed within the Windows Programming forums, part of the Platform Specific Boards category; how can i check if 'Ctrl+A' pressed?? WM_HOTKEY??...

  1. #1
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    key pressed

    how can i check if 'Ctrl+A' pressed?? WM_HOTKEY??

  2. #2
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    WM_HOTKEY??
    Yep, that's right

  3. #3
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    ok,but how i check if ctrl+a i pressed??what i need to write in the if sentence??

  4. #4
    Registered User valaris's Avatar
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    Think they are called keyboard accelerators, there are functions to add them from resource files and probably other ways too.

  5. #5
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    Quote Originally Posted by hareldo View Post
    ok,but how i check if ctrl+a i pressed??what i need to write in the if sentence??
    Code:
    #pragma comment( lib, "user32.lib" ) 
    #include <windows.h>
    
    #define VK_A    0x041
    
    #define CALL_CMD_CTRL_A 101
    
    LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
    
    char szClassName[ ] = "Hotkey Example";
    
    int WINAPI WinMain (HINSTANCE hThisInstance,
                        HINSTANCE hPrevInstance,
                        LPSTR lpszArgument,
                        int nFunsterStil)
    {
        HWND hwnd;               
        MSG messages;            
        WNDCLASSEX wincl;        
    
        wincl.hInstance = hThisInstance;
        wincl.lpszClassName = szClassName;
        wincl.lpfnWndProc = WindowProcedure;    
        wincl.style = CS_DBLCLKS;     
        wincl.cbSize = sizeof (WNDCLASSEX);
        wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
        wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
        wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
        wincl.lpszMenuName = NULL;                
        wincl.cbClsExtra = 0;                      
        wincl.cbWndExtra = 0;                      
        wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
    
        if (!RegisterClassEx (&wincl))
            return 0;
        hwnd = CreateWindowEx (
            0,                   
            szClassName,         
            "My Hot Key example to catch Ctrl-A",       
            WS_OVERLAPPEDWINDOW, 
            CW_USEDEFAULT,       
            CW_USEDEFAULT,       
            544,                 
            375,                 
            HWND_DESKTOP,        
            NULL,                
            hThisInstance,       
            NULL                 
            );
        RegisterHotKey(hwnd, CALL_CMD_CTRL_A, MOD_CONTROL, VK_A);
        ShowWindow(hwnd, nFunsterStil);
        while (GetMessage (&messages, NULL, 0, 0))
        {
            TranslateMessage(&messages);
            DispatchMessage(&messages);
        }
        return messages.wParam;
    }
    
    LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
    {
        switch (message)                 
        {
            case WM_HOTKEY:
                switch(wParam)
                {
                    case CALL_CMD_CTRL_A:
                        MessageBox(NULL, "Got Ctrl-A", "We Got Ctrl-A", MB_OK);
                        break;
                }
                break;
            case WM_DESTROY:
                PostQuitMessage (0);       
                break;
            default:                      
                return DefWindowProc (hwnd, message, wParam, lParam);
        }
        return 0;
    }

  6. #6
    Banned master5001's Avatar
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    BobS0327 is mighty kind. I would have probably just posted:

    Code:
    LRESULT CALLBACK callback(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
    {
      if(msg == WM_HOTKEY)
      {
       if(wParam == whatever)
       {
         MessageBeep(MB_OK);
         return 0;
       }
      }
      return DefWindowProc (hwnd, message, wParam, lParam);
    }
    Kudos to you for not being quite so lazy.

  7. #7
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    Quote Originally Posted by master5001 View Post
    BobS0327 is mighty kind. I would have probably just posted:

    Code:
    LRESULT CALLBACK callback(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
    {
      if(msg == WM_HOTKEY)
      {
       if(wParam == whatever)
       {
         MessageBeep(MB_OK);
         return 0;
       }
      }
      return DefWindowProc (hwnd, message, wParam, lParam);
    }

    Kudos to you for not being quite so lazy.
    Actually, your way is the much preferred way than my switch statement which is just pure laziness on my part. Unfortunately, the majority of my posted examples come from copy and pasting (hacking) from my old projects and I don't devote enough time to cleaning them up.

  8. #8
    Banned master5001's Avatar
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    Lol fair enough. I rarely copy and paste code anymore merely because it requires too much effort to find the exact code I am thinking of. Which has the added disadvantage of occassionally posting uncompileable code or just making simple mistakes. The other regulars here are always so kind and observant and love to remind us of our shortcomings.

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