使用WPF实现一个虚拟键盘的代码示例

 
<Window x:Class="VirtualKeyboard.MainWindow"
 
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 
Title="Virtual Keyboard" Height="350" Width="525">
 
<Grid>
 
<StackPanel Orientation="Vertical">
 
<!-- 第一行按键 -->
 
<StackPanel Orientation="Horizontal">
 
<Button Content="Q" Width="50" Height="50" Click="Button_Click"/>
 
<Button Content="W" Width="50" Height="50" Click="Button_Click"/>
 
<!-- 其他按键依次添加 -->
 
</StackPanel>
 
<!-- 其他行按键 -->
 
</StackPanel>
 
</Grid>
 
</Window>

 
using System;
 
using System.Windows;
 
using System.Runtime.InteropServices;
 
namespace VirtualKeyboard
 
{
 
public partial class MainWindow : Window
 
{
 
[DllImport("user32.dll")]
 
public static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, int dwExtraInfo);
 
private const uint KEYEVENTF_EXTENDEDKEY = 0x0001;
 
private const uint KEYEVENTF_KEYUP = 0x0002;
 
public MainWindow()
 
{
 
InitializeComponent();
 
}
 
private void Button_Click(object sender, RoutedEventArgs e)
 
{
 
Button button = (Button)sender;
 
string key = button.Content.ToString();
 
// 根据按键内容模拟键盘输入
 
switch (key)
 
{
 
case "Q":
 
keybd_event(0x51, 0, 0, 0);
 
keybd_event(0x51, 0, KEYEVENTF_KEYUP, 0);
 
break;
 
// 其他按键的处理
 
}
 
}
 
}
 
}

 
using System;
 
using System.Windows;
 
using System.Runtime.InteropServices;
 
namespace VirtualKeyboard
 
{
 
public partial class MainWindow : Window
 
{
 
// 定义钩子相关常量和函数
 
private const int WH_KEYBOARD_LL = 13;
 
private const int WM_KEYDOWN = 0x0100;
 
private const int WM_KEYUP = 0x0101;
 
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
 
private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);
 
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
 
[return: MarshalAs(MarshalType.Bool)]
 
private static extern bool UnhookWindowsHookEx(IntPtr hhk);
 
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
 
private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);
 
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
 
private static extern IntPtr GetModuleHandle(string lpModuleName);
 
private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
 
private static LowLevelKeyboardProc _proc = HookCallback;
 
private static IntPtr _hookID = IntPtr.Zero;
 
public MainWindow()
 
{
 
InitializeComponent();
 
_hookID = SetHook(_proc);
 
}
 
~MainWindow()
 
{
 
UnhookWindowsHookEx(_hookID);
 
}
 
private static IntPtr SetHook(LowLevelKeyboardProc proc)
 
{
 
using (System.Diagnostics.Process curProcess = System.Diagnostics.Process.GetCurrentProcess())
 
using (System.Diagnostics.ProcessModule curModule = curProcess.MainModule)
 
{
 
return SetWindowsHookEx(WH_KEYBOARD_LL, proc, GetModuleHandle(curModule.ModuleName), 0);
 
}
 
}
 
private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
 
{
 
if (nCode >= 0 && (wParam == (IntPtr)WM_KEYDOWN || wParam == (IntPtr)WM_KEYUP))
 
{
 
int vkCode = Marshal.ReadInt32(lParam);
 
// 在这里处理监控到的键盘输入
 
}
 
return CallNextHookEx(_hookID, nCode, wParam, lParam);
 
}
 
}
 
}