WPF中的虚拟键盘：模拟真正的输入设备？

Question

我想在Win7中创建一个简单的虚拟键盘像

|---|---|---| 9 char in first block (abcdefgijk) 

|---|---|---| 

|---|---|---|

有9个按钮，点击第一个按钮切换到其他视图时。

|---|---|---| 
a  b c 
|---|---|---| 
e f g  
|---|---|---| 
i j k

现在我很困惑如何点击一个按钮像按键盘可以生成字符输出到另一个应用程序。我正在使用

System.Windows.Forms.SendKeys.SendWait(sendString); 

但它不起作用。我知道sendString是正确的，因为我认为它像Console.WriteLine(sendString);。

另一个问题是单击按钮时焦点不会变回到按钮。

任何人都有如何实现这个键盘的解决方案？

谢谢！

感谢您的回复，实际上我已经添加这些代码 它也有一些问题，当我点击按钮很多时间。和焦点也不能工作，当我点击按钮它总是专注于按钮。在这个示例中它只包含2个按钮。你能帮助看看这些代码发现错误。许多人认为！

namespace WpfApplication5 
{ 
    public partial class UserControl1 : UserControl 
    { 
     [DllImport("user32.dll")] 
     public static extern int SetWindowLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong); 

     [DllImport("user32.dll", SetLastError = true)] 
     public static extern UInt32 GetWindowLong(IntPtr hWnd, int nIndex); 

     private IInputElement focusedInputElement; 
     private Window parentWindow; 
     private List<Button> keyCollection = new List<Button>(); 

     public UserControl1(Window parent) 
     { 
      this.parentWindow = parent; 
      this.setupKeyboardControl(); 
     } 

     public UserControl1(IInputElement elementToFocusOn) 
     { 
      // set focus 
      this.focusedInputElement = elementToFocusOn; 
      // setup this control 
      this.setupKeyboardControl(); 
     } 

     private void setupKeyboardControl() 
     { 
      InitializeComponent(); 
      // add all keys to internal collection 
      this.addAllKeysToInternalCollection(); 
      // install clicks 
      this.installAllClickEventsForCollection(this.keyCollection); 
     } 

     private void addAllKeysToInternalCollection() 
     { 
      // itterate all panels 
      // itterate all buttons 
      // add to list 
      Console.WriteLine("Run at here"); 
      this.keyCollection.Add(A); 
      this.keyCollection.Add(B); 
     } 

     /// <summary> 
     /// Install click events for all keys in a collection 
     /// </summary> 
     /// <param name="keysToInstall"></param> 
     private void installAllClickEventsForCollection(List<Button> keysToInstall) 
     { 
      // itterate all 
      foreach (Button buttonElement in keysToInstall) 
      { 
       // install click event 
       buttonElement.Click += new RoutedEventHandler(buttonElement_Click); 
      } 
     } 

     /* private void Window_KeyDown(object sender, KeyEventArgs e) 
     { 
      if (e.Key == Key.A) 
       A.RaiseEvent(new RoutedEventArgs(Button.ClickEvent)); 
      else if (e.Key == Key.B) 
       B.RaiseEvent(new RoutedEventArgs(Button.ClickEvent)); 
     }*/ 

     void buttonElement_Click(object sender, RoutedEventArgs e) 
     { 
      // create variable for holding string 
      String sendString = ""; 

      try 
      { 
       // stop all event handling 
       e.Handled = true; 

       // set sendstring to key 
       sendString = ((Button)sender).CommandParameter.ToString(); 

       // if something to send 
       if (!String.IsNullOrEmpty(sendString)) 
       { 
        // if sending a string 
        if (sendString.Length > 1) 
        { 
         // add {} 
         sendString = "{" + sendString + "}"; 
        } 

        // if a focusable element has been specified 
        if (this.focusedInputElement != null) 
        { 
         Console.WriteLine("1",sendString); 
         // set keyboard focus 
         Keyboard.Focus(this.focusedInputElement); 
         // set normal focus 
         this.focusedInputElement.Focus(); 
        } 

        // send key to simulate key press 
        // System.Windows.Forms.SendKeys.Send(sendString); 

        System.Windows.Forms.SendKeys.SendWait(sendString); 
        Console.WriteLine(sendString); 

       } 
      } 
      catch (Exception) 
      { 
       // do nothing - not important for now 
       Console.WriteLine("Could not send key press: {0}", sendString); 
      } 
     } 

     private void UserControl_Loaded(object sender, RoutedEventArgs e) 
     { 
      // if we have specified a parent 
      if (this.parentWindow != null) 
      { 
       // Get this window's handle 
       IntPtr HWND = new WindowInteropHelper(this.parentWindow).Handle; 
       Console.WriteLine("Run in UserControl load"); 
       // style of window? 
       int GWL_EXSTYLE = (-20); 
       // get - retrieves information about a specified window 
       GetWindowLong(HWND, GWL_EXSTYLE); 
       // set - changes the attribute of a specified window - I think this stops it being focused on 
       SetWindowLong(HWND, GWL_EXSTYLE, (IntPtr)(0x8000000)); 
      } 
     } 
    } 
} 

Answer 1

最可靠的方法做，这是使用Win32 API

[DllImport("user32.dll")] 
public static extern uint SendInput(uint nInputs, ref INPUT pInputs, int cbSize); 

[DllImport("user32.dll", EntryPoint = "SendInput")] 
public static extern uint SendInput(uint nInputs, InputKeys[] inputs, int cbSize); 

还有就是要在CodePlex上

http://wosk.codeplex.com/做完整的工作程序是什么一个很好的例子