我有一个WPF C#应用程序。我有双屏幕,我想在其中一个屏幕上取消鼠标事件,因为它是一个触摸屏,当用户按下它时它会将焦点从主屏幕上移开。我想在询问用户数据时启用触摸,然后阻止它。
我找到了一些关于使用user32.dll的应用程序挂钩的好例子,这有助于我捕获设备输入。一个例子显示在这里:http://www.pinvoke.net/default.aspx/user32.setwindowshookex。另外,更适合鼠标事件的另一个可以在这里显示:How to avoid mouse move on Touch
我的问题不是捕获设备输入,而是禁用它。上面的第一个示例显示了如何捕获键盘输入并提取按键,但不禁用它。
第二个例子不起作用。它捕获鼠标事件,常规USB鼠标设备和触摸屏设备。我可以告诉哪个是哪个,但我无法取消触摸屏设备。在该示例中,为触摸设备返回new IntPtr(1);
。这对设备输入无效。
另一方面,当我做相反的事情时,意味着返回新的IntPtr(1);在每一个鼠标事件但触摸事件,似乎我的常规鼠标根本不移动(触摸设备鼠标确实移动)。
这个方法可以帮助阻止常规鼠标,但不能阻止触摸鼠标,因为我没有返回的代码会阻止这个鼠标(我找到这个鼠标并返回代码,我检查了很多次,代码什么也没做)
这是我的代码基于以上示例:
static readonly LowLevelMouseProc hookCallback = HookCallback;
static IntPtr hookId = IntPtr.Zero;
public DisableTouchConversionToMouse()
{
hookId = SetHook(hookCallback);
}
static IntPtr SetHook(LowLevelMouseProc proc)
{
var moduleHandle = UnsafeNativeMethods.GetModuleHandle(null);
var setHookResult = UnsafeNativeMethods.SetWindowsHookEx(HookType.WH_MOUSE_LL,
proc, moduleHandle, 0);
if (setHookResult == IntPtr.Zero)
{
throw new Win32Exception();
}
return setHookResult;
}
delegate IntPtr LowLevelMouseProc(int nCode, IntPtr wParam, IntPtr lParam);
static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0)
{
var info = (MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));
var extraInfo = (uint)info.dwExtraInfo.ToInt32();
// if ((extraInfo & MOUSEEVENTF_FROMTOUCH) == MOUSEEVENTF_FROMTOUCH)
if (extraInfo>0)
{
Console.WriteLine("TOUCH SCREEN FOUND!");
return new IntPtr(1);
}
}
return UnsafeNativeMethods.CallNextHookEx(hookId, nCode, wParam, lParam);
}
public enum HookType : int
{
WH_JOURNALRECORD = 0,
WH_JOURNALPLAYBACK = 1,
WH_KEYBOARD = 2,
WH_GETMESSAGE = 3,
WH_CALLWNDPROC = 4,
WH_CBT = 5,
WH_SYSMSGFILTER = 6,
WH_MOUSE = 7,
WH_HARDWARE = 8,
WH_DEBUG = 9,
WH_SHELL = 10,
WH_FOREGROUNDIDLE = 11,
WH_CALLWNDPROCRET = 12,
WH_KEYBOARD_LL = 13,
WH_MOUSE_LL = 14
}
[StructLayout(LayoutKind.Sequential)]
struct POINT
{
public int x;
public int y;
}
[StructLayout(LayoutKind.Sequential)]
struct MSLLHOOKSTRUCT
{
public POINT pt;
public uint mouseData;
public uint flags;
public uint time;
public IntPtr dwExtraInfo;
}
[SuppressUnmanagedCodeSecurity]
static class UnsafeNativeMethods
{
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern IntPtr SetWindowsHookEx(HookType code, LowLevelMouseProc lpfn, IntPtr hMod,
uint dwThreadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool UnhookWindowsHookEx(IntPtr hhk);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode,
IntPtr wParam, IntPtr lParam);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern IntPtr GetModuleHandle(string lpModuleName);
}
答案 0 :(得分:2)
如果你的主要目的是避免从主窗口移开焦点,那么使用WS_EX_NOACTIVATE
可以更简单的解决方法