How to get a notice when a up aroow key is pressed in C language

Question

How to get a notice when a up aroow key is pressed in C language

Chang Chi 61

Hi, I like to move a picture on the screen by clicking up, down, right, left arrow on the key board. Is there a way to get a notice in my software when “up arrow key” in keyboard is pressed, as an example. I tried bres=IsInputKey(0); How do I find out what key number is “up-arrow” Is this a right approach, I wonder I use C, and C++ Languages on the platform of Windows10 and Visual studio 2017 Thank you in advance ChangChiTheGraphics

Viorel 121.3K Reputation points

2021-02-25T09:36:03.597+00:00

Is this a Windows Forms application made in C++? Then you can override ProcessCmdKey to intercept the keys regardless on current focus. Confirm the kind of your program.

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Viorel 121.3K Reputation points

2021-02-25T09:36:03.597+00:00

Is this a Windows Forms application made in C++? Then you can override ProcessCmdKey to intercept the keys regardless on current focus. Confirm the kind of your program.

Answer 1

You need to implement a message map for windows events.

https://learn.microsoft.com/en-us/windows/win32/inputdev/wm-keydown
https://learn.microsoft.com/en-us/windows/win32/inputdev/virtual-key-codes

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)  
{  
    switch (message)  
    {  
    case WM_KEYDOWN:  
        switch (wParam)  
        {  
        case VK_UP:  
            MessageBoxA(hWnd, "UP", "ARROW", MB_OK);  
            break;  
        }  
        break;  
  
    default:  
        return DefWindowProc(hWnd, message, wParam, lParam);  
    }  
    return 0;  
}

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How to get a notice when a up aroow key is pressed in C language

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