在第一次单击鼠标时获取活动应用程序的名称

本文关键字：应用程序 活动 获取 第一次 单击 鼠标 | 更新日期: 2023-09-27 18:10:34

我试图获得当前活动应用程序的名称，仅在该应用程序中的第一次鼠标单击。

我的意思是:当我总是在同一个应用程序上时，我不想每次用户点击应用程序时都获得应用程序的名称。我的代码确实运行得很好，但它在每次鼠标点击时都写入了应用程序名称。

如果我想只在用户单击另一个应用程序时获得应用程序的名称，我该如何更改它?

class InterceptMouse
{
    private static LowLevelMouseProc _proc = HookCallback;
    private static IntPtr _hookID = IntPtr.Zero;
    private const int WM_LBUTTONDOWN = 0x0201;
    private const int WH_MOUSE_LL = 14;
    public static void Main()
    {
        _hookID = SetMouseHook(_proc);
        Application.Run();
        UnhookWindowsHookEx(_hookID);
    }
    private static IntPtr SetMouseHook(LowLevelMouseProc proc)
    {
        using (Process curProcess = Process.GetCurrentProcess())
        using (ProcessModule curModule = curProcess.MainModule)
        {
            return SetWindowsHookEx(WH_MOUSE_LL, proc,
                GetModuleHandle(curModule.ModuleName), 0);
        }
    }
    private delegate IntPtr LowLevelMouseProc(int nCode, IntPtr wParam, IntPtr lParam);
    private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
    {
        if (nCode >= 0 && wParam == (IntPtr)WM_LBUTTONDOWN)
        {
            IntPtr hwnd2 = GetForegroundWindow();
            StringBuilder windowtitle = new StringBuilder(256);
            if (GetWindowText(hwnd2, windowtitle, windowtitle.Capacity) > 0)
                Console.WriteLine(windowtitle);
        }
        return CallNextHookEx(_hookID, nCode, wParam, lParam);
    }

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr SetWindowsHookEx(int idHook,
        LowLevelMouseProc lpfn, IntPtr hMod, uint dwThreadId);
    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    [return: MarshalAs(UnmanagedType.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);
    [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
    public static extern IntPtr GetForegroundWindow();
    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString,
        int nMaxCount);
}

在第一次单击鼠标时获取活动应用程序的名称

您至少有两个明显的选择。一个是保留你最后看到的标题，如果下一个标题等于最后看到的标题，就不要写。

static string lastseen = null;
private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
    if (nCode >= 0 && wParam == (IntPtr)WM_LBUTTONDOWN)
    {
        IntPtr hwnd2 = GetForegroundWindow();
        StringBuilder windowtitle = new StringBuilder(256);
        if (GetWindowText(hwnd2, windowtitle, windowtitle.Capacity) > 0) 
        {
            var title = windowtitle.ToString();
            if (!String.Equals(lastseen, title)
            {
               lastseen = title;
               Console.WriteLine(lastseen);
            }
        }
    }
    return CallNextHookEx(_hookID, nCode, wParam, lParam);
}

第二种选择是保留一个包含已见标题的HashSet，向HashSet中添加新标题，如果HashSet

中已经找到一个标题，则忽略该标题。
static seen = new HashSet<string>();
private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
    if (nCode >= 0 && wParam == (IntPtr)WM_LBUTTONDOWN)
    {
        IntPtr hwnd2 = GetForegroundWindow();
        StringBuilder windowtitle = new StringBuilder(256);
        if (GetWindowText(hwnd2, windowtitle, windowtitle.Capacity) > 0) 
        {
            var title = windowtitle.ToString();
            if (!seen.Contains(title))
            {
               seen.Add(title);
               Console.WriteLine(title);
            }
        }
    }
    return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
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