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Xambey
Asked:2020-10-05 05:22:17 +0000 UTC2020-10-05 05:22:17 +0000 UTC

单击箭头 C++

  • 772

我决定编写一个控制台 Mario 并遇到了以下问题：如何通过 WinApi 或使用标准 C++ 工具捕获按下键盘上箭头的事件？（视窗）

void Game::input()
{
    Key key;
    char c;
    while (true)
    {
        cin >> c;
        switch (c)
        {
        case up_key:
            movePlayer(player_pos + new Position(0, -3));
            break;
        case down_key:
            movePlayer(player_pos + new Position(0, 1));
            break;
        case right_key:
            movePlayer(player_pos + new Position(1, 0));
            break;
        case left_key:
            movePlayer(player_pos - new Position(1, 0));
            break;
        }
        show();
    }
}
c++

2 个回答

  1. Best Answer

    那么，在 Windows 控制台中，您可以使用非标准的，但包含在 SDK 中getch()

    #include <stdio.h>
#include <conio.h>

int main(int argc, const char * argv[])
{
    int k1, k2;
    for(;;)
    {
        k1 = _getch();
        if (k1 == 0xE0 || k1 == 0x00)
        {
            k2 = _getch();
            switch(k2)
            {
            case 0x4B: printf("Left  on %s kbd\n", k1 ? "main" : "extended"); break;
            case 0x48: printf("Up    on %s kbd\n", k1 ? "main" : "extended"); break;
            case 0x4D: printf("Right on %s kbd\n", k1 ? "main" : "extended"); break;
            case 0x50: printf("Down  on %s kbd\n", k1 ? "main" : "extended"); break;
            }
        }
    }
}
    • 4

  2. 需要用到钩子，钩子）

    #include <stdio.h>
#include <Windows.h>
#define _WIN32_WINNT 0x050

LRESULT CALLBACK LowLevelKeyboardProc( int nCode, WPARAM wParam, LPARAM lParam )
{
    BOOL fEatKeystroke = FALSE;

    if( nCode == HC_ACTION )
    {
        switch( wParam )
        {
            case WM_KEYDOWN:
            case WM_SYSKEYDOWN:
            case WM_KEYUP:
            case WM_SYSKEYUP:
            PKBDLLHOOKSTRUCT p = (PKBDLLHOOKSTRUCT)lParam;

            if( fEatKeystroke = (p->scanCode == 0x48) )
            {     
                printf( "UP\n" );
                /*keybd_event( 'B', 0, 0, 0 );
                keybd_event( 'B', 0, KEYEVENTF_KEYUP, 0 );*/
                break;
            }
            if( fEatKeystroke = (p->scanCode == 0x4B) )
            {     
                printf( "LEFT\n" );
                /*keybd_event( 'B', 0, 0, 0 );
                keybd_event( 'B', 0, KEYEVENTF_KEYUP, 0 );*/
                break;
            }
            if( fEatKeystroke = (p->scanCode == 0x4D) )
            {     
                printf( "DOWN\n" );
                /*keybd_event( 'B', 0, 0, 0 );
                keybd_event( 'B', 0, KEYEVENTF_KEYUP, 0 );*/
                break;
            }
            if( fEatKeystroke = (p->scanCode == 0x50) )
            {     
                printf( "RIGHT\n" );
                /*keybd_event( 'B', 0, 0, 0 );
                keybd_event( 'B', 0, KEYEVENTF_KEYUP, 0 );*/
                break;
            }
            break;
        }
    }
    return(fEatKeystroke ? 1 : CallNextHookEx( NULL, nCode, wParam, lParam ));
}

int main()
{
    // Install the low-level keyboard & mouse hooks
    HHOOK hhkLowLevelKybd = SetWindowsHookEx( WH_KEYBOARD_LL, LowLevelKeyboardProc, 0, 0 );

    // Keep this app running until we're told to stop
    MSG msg;
    while( !GetMessage( &msg, NULL, NULL, NULL ) )
    {    //this while loop keeps the hook
        TranslateMessage( &msg );
        DispatchMessage( &msg );
    }

    UnhookWindowsHookEx( hhkLowLevelKybd );

    return(0);
}
    • 2

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