[分享]WPF 虚拟键盘

场景：用WPF做触屏的软件难免会需要用户输入的问题，至少是简单的数字，这个时候就免不了需要键盘输入。

思路：既然是虚拟键盘，那么我的目的就是模拟键盘输入即可。

1.模拟键盘输入

模拟键盘输入？那么肯定免不了调用Win32API了。所以查看下Win32API是否提供了键盘输入的功能，找到发送按键的函数：

　　

[DllImport("user32.dll", EntryPoint = "PostMessageW")]

public static extern int PostMessage( int hwnd,int wMsg,int wParam,int lParam);

2.找到需要输入的控件:

[DllImport("user32.dll")]
public static extern int GetFocus();

3.找到当前窗体

 

[DllImport("user32.dll")]
public static extern int GetForegroundWindow();

[DllImport("user32.dll")]
public static extern int AttachThreadInput(int idAttach,int idAttachTo,int fAttach);

[DllImport("user32.dll")]
public static extern int GetWindowThreadProcessId(int hwnd, int lpdwProcessId);

 

关键代码：

(1)Win32API功能类：

　　 /// 

    /// Win32接口功能类
    /// 
    public static class Win32API
    {
        /// 

        /// 键入
        /// 
        public const int WM_KEYDOWN = 0x100;

        [DllImport("user32.dll", EntryPoint = "SendMessageW")]
        public static extern int SendMessage(
             int hwnd,
             int wMsg,
             int wParam,
             int lParam);
        [DllImport("user32.dll", EntryPoint = "PostMessageW")]
        public static extern int PostMessage(
             int hwnd,
             int wMsg,
             int wParam,
             int lParam);
        [DllImport("user32.dll")]
        public static extern int GetForegroundWindow();
        [DllImport("user32.dll")]
        public static extern IntPtr GetLastActivePopup(IntPtr hWnd);
        [DllImport("user32.dll")]
        public static extern bool SetForegroundWindow(IntPtr hWnd);
        [DllImport("user32.dll")]
        public static extern int GetFocus();
        [DllImport("user32.dll")]
        public static extern int AttachThreadInput(
             int idAttach,
             int idAttachTo,
             int fAttach);
        [DllImport("user32.dll")]
        public static extern int GetWindowThreadProcessId(
             int hwnd,
             int lpdwProcessId);
        [DllImport("kernel32.dll")]
        public static extern int GetCurrentThreadId();

        [DllImport("user32.dll")]
        public static extern IntPtr GetDesktopWindow();
    }

(2)发送按键实现

　　　　 /// 

        /// 发送按键
        /// 
        /// 键盘ascii码
        private void SendKey(byte asiiCode)
        {
            AttachThreadInput(true);
            int getFocus = Win32API.GetFocus();
            //向前台窗口发送按键消息
            Win32API.PostMessage(getFocus, Win32API.WM_KEYDOWN, asiiCode, 0);
            AttachThreadInput(false); //取消线程亲和的关联
        }
        /// 

        /// 设置线程亲和,附到前台窗口所在线程,只有在线程内才可以获取线程内控件的焦点
        /// 
        /// 是否亲和
        private void AttachThreadInput(bool b)
        {
            Win32API.AttachThreadInput(
                   Win32API.GetWindowThreadProcessId(
                   Win32API.GetForegroundWindow(), 0),
                   Win32API.GetCurrentThreadId(), Convert.ToInt32(b));
        }

(3)附上按键ascii码表:

4.时间关系就做个简单的吧：

 

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