C++ 发送输入()

Question

I want to create a program which sends exactly one key stroke for every key stroke I press. I'm having a problem with this program because it keeps sending keystrokes even after I stopped pressing the key.

For example; if pressed "UP", it will continue pressing up until i press another key.

Can you help me with this please.

Thank you

int main()
{
    // This structure will be used to create the keyboard
    // input event.
    INPUT ip;

    while(1)
    {
             if (GetAsyncKeyState(VK_UP) < 0)
          {
            INPUT ip;
            ip.type = INPUT_KEYBOARD;
            ip.ki.time = 0;
            ip.ki.dwExtraInfo = 0;          
            ip.ki.wVk = 0x26; // virtual-key code for the "UP arrow" key
            ip.ki.dwFlags = 0; // 0 for key press
            SendInput(1, &ip, sizeof(INPUT));
          }

          if (GetAsyncKeyState(VK_DOWN) < 0)
          {
            INPUT ip;
            ip.type = INPUT_KEYBOARD;
            ip.ki.time = 0;
            ip.ki.dwExtraInfo = 0;          
            ip.ki.wVk = 0x28; // virtual-key code for the "UP arrow" key
            ip.ki.dwFlags = 0; // 0 for key press
            SendInput(1, &ip, sizeof(INPUT));


          }

           if (GetAsyncKeyState(VK_RIGHT) < 0)
          {
            INPUT ip;
            ip.type = INPUT_KEYBOARD;
            ip.ki.time = 0;
            ip.ki.wVk = 0;
            ip.ki.dwExtraInfo = 0;          
            ip.ki.wVk = 0x27; // virtual-key code for the "UP arrow" key
            ip.ki.dwFlags = 0; // 0 for key press
            SendInput(1, &ip, sizeof(INPUT));

          }

          if (GetAsyncKeyState(VK_LEFT) < 0)
          {
            INPUT ip;
            ip.type = INPUT_KEYBOARD;
            ip.ki.time = 0;
            ip.ki.dwExtraInfo = 0;          
            ip.ki.wVk = 0x25; // virtual-key code for the "UP arrow" key
            ip.ki.dwFlags = 0; // 0 for key press
            SendInput(1, &ip, sizeof(INPUT));


          }

    }

    // Exit normally
    return 0;
}

Answer 1

You can keep the state of whether it's the first time you've clicked the button or not. Then you just reset it when you release. Here's an example for one of the buttons.

bool up_pressed = false;

int main()
{
         if (GetAsyncKeyState(VK_UP) < 0)
         {
            if (!up_pressed)
            {
                up_pressed = true;
                INPUT ip;
                ip.type = INPUT_KEYBOARD;
                ip.ki.time = 0;
                ip.ki.dwExtraInfo = 0;          
                ip.ki.wVk = 0x26; // virtual-key code for the "UP arrow" key
                ip.ki.dwFlags = 0; // 0 for key press
                SendInput(1, &ip, sizeof(INPUT));
            }
         }
         else 
         {
             up_pressed = false;
         }
}

Answer 2

hi you can use this code: SendKeys::Send("{UP}");