Question

我正在尝试通过使用user32.dll keybd_event模拟按键来突出显示文本框中的文本（使用 SHIFT + RIGHT_ARROW Win快捷方式），但它不起作用：< / p>

[DllImport("user32.dll")]
public static extern void keybd_event(byte bVk, byte bScan, int dwFlags, int dwExtraInfo);
public const int SHIFT_LEFT = 0xA0;
public const int RIGHT = 0x27;

....

keybd_event(SHIFT_LEFT, 0, 0, 0);
keybd_event(RIGHT, 0, 0, 0);
keybd_event(RIGHT, 0, 2, 0);
keybd_event(SHIFT_LEFT, 0, 2, 0);

光标向右移动，但文字未突出显示......有人可以解释原因吗？

修改为什么这适用于Windows OnScreenKeyboard？

KEYEVENTF_EXTENDEDKEY （0x0001）：如果指定，则扫描代码前面有一个值为0xE0（224）的前缀字节。
所以，我这样做了：

keybd_event(SHIFT_LEFT, 0, 1 | 0, 0);
keybd_event(RIGHT, 0, 1 | 0, 0);
keybd_event(RIGHT, 0, 1 | 2, 0);
keybd_event(SHIFT_LEFT, 0, 1 | 2, 0);

问题解决了！
有关KEYEVENTF_EXTENDEDKEY的详细说明，请访问here。

Answer 1

某些功能已在MSDN上公开，我不需要解释。以下是作为代码的基本信息，它在不同的系统上运行：

    ''' <summary>
    ''' Simulate key down event on Windows machine
    ''' </summary>
    ''' <param name="nCode">key</param>
    ''' <remarks></remarks>
    Public Sub SetKeyDown(ByVal nCode As Integer)
        Dim vKey As Byte = Convert.ToByte(nCode)
        Dim scanCode As Integer = MapVirtualKey(vKey, 0)
        Dim ret As Integer = keybd_event(vKey, CByte(scanCode), KEYEVENTF_EXTENDEDKEY Or 0, IntPtr.Zero)
    End Sub

    ''' <summary>
    ''' Simulate key up event on Windows machine
    ''' </summary>
    ''' <param name="nCode">key</param>
    ''' <remarks></remarks>
    Public Sub SetKeyUp(ByVal nCode As Integer)
        Dim vKey As Byte = Convert.ToByte(nCode)
        Dim scanCode As Integer = MapVirtualKey(vKey, 0)
        Dim ret As Integer = keybd_event(vKey, CByte(scanCode), KEYEVENTF_EXTENDEDKEY Or KEYEVENTF_KEYUP, IntPtr.Zero)
    End Sub

MSDN参考

Keybd_event：

http://msdn.microsoft.com/en-us/library/windows/desktop/ms646304%28v=vs.85%29.aspx

MapVirtualKey：

http://msdn.microsoft.com/en-us/library/windows/desktop/ms646306%28v=vs.85%29.aspx

C＃user32.dll keybd_event不能正常工作

1 个答案:

MSDN参考