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：
欢迎指正,转载请注明出处http://www.cnblogs.com/xinwang/p/6143169.html
