C# · 12月 26, 2021

c# – 无需窃取焦点即可获得用户关注

我有一个程序让用户打开几个表单.一旦给定的事件发生(例如:30秒过去),我需要在触发事件的窗体上获得用户注意,而不会窃取焦点.
我已经得到了顶部的形式 f.TopMost = true;

但我想实现一些替代方案.由于改变框架的边框颜色似乎几乎不可能完成任务(这个解决方案本来是最好的),有人有什么想法如何在不偷眼的情况下得到注意?

解决方法 选项A:您需要从Windows API使用FlashWindowEx.这在.NET中不可用,因此您需要使用PInvoke.

选项B:使用系统托盘中的气球提示.这是内置于.NET,但要求您的应用程序使用通知图标,您可能不希望.更多细节在这里:http://msdn.microsoft.com/en-us/library/system.windows.forms.notifyicon.showballoontip.aspx

以下是如何使用选项A的示例:

pInvoke.net有最好的例子:http://pinvoke.net/default.aspx/user32.FlashWindowEx

[DllImport(“user32.dll”)][return: MarshalAs(UnmanagedType.Bool)]static extern bool FlashWindowEx(ref FLASHWINFO pwfi);

用户自定义类型:

[StructLayout(LayoutKind.Sequential)]public struct FLASHWINFO{ public UInt32 cbSize; public IntPtr hwnd; public UInt32 dwFlags; public UInt32 uCount; public UInt32 dwTimeout;}

笔记:

//Stop flashing. The system restores the window to its original state. public const UInt32 FLASHW_STOP = 0; //Flash the window caption. public const UInt32 FLASHW_CAPTION = 1; //Flash the taskbar button. public const UInt32 FLASHW_TRAY = 2; //Flash both the window caption and taskbar button.//This is equivalent to setting the FLASHW_CAPTION | FLASHW_TRAY flags. public const UInt32 FLASHW_ALL = 3; //Flash continuously,until the FLASHW_STOP flag is set. public const UInt32 FLASHW_TIMER = 4; //Flash continuously until the window comes to the foreground. public const UInt32 FLASHW_TIMERNOFG = 12;

提示&技巧:

请加一些!

示例代码:

/// <summary>/// Flashes a window/// </summary>/// <param name=”hWnd”>The handle to the window to flash</param>/// <returns>whether or not the window needed flashing</returns>public static bool FlashWindowEx(IntPtr hWnd){ FLASHWINFO fInfo = new FLASHWINFO(); fInfo.cbSize = Convert.ToUInt32(Marshal.SizeOf(fInfo)); fInfo.hwnd = hWnd; fInfo.dwFlags = FLASHW_ALL; fInfo.uCount = UInt32.MaxValue; fInfo.dwTimeout = 0; return FlashWindowEx(ref fInfo);}

/// Minor adjust to the code above/// <summary>/// Flashes a window until the window comes to the foreground/// Receives the form that will flash/// </summary>/// <param name=”hWnd”>The handle to the window to flash</param>/// <returns>whether or not the window needed flashing</returns>public static bool FlashWindowEx(Form frm){ IntPtr hWnd = frm.Handle; FLASHWINFO fInfo = new FLASHWINFO(); fInfo.cbSize = Convert.ToUInt32(Marshal.SizeOf(fInfo)); fInfo.hwnd = hWnd; fInfo.dwFlags = FLASHW_ALL | FLASHW_TIMERNOFG; fInfo.uCount = UInt32.MaxValue; fInfo.dwTimeout = 0; return FlashWindowEx(ref fInfo);}

这是官方微软的例子:@L_502_2@

[DllImport(“user32.dll”)] [return: MarshalAs(UnmanagedType.Bool)] public static extern bool FlashWindowEx(ref FLASHWINFO pwfi); [StructLayout(LayoutKind.Sequential)] public struct FLASHWINFO { /// <summary> /// The size of the structure in bytes. /// </summary> public uint cbSize; /// <summary> /// A Handle to the Window to be Flashed. The window can be either opened or minimized. /// </summary> public IntPtr hwnd; /// <summary> /// The Flash Status. /// </summary> public FlashWindowFlags dwFlags; //uint /// <summary> /// The number of times to Flash the window. /// </summary> public uint uCount; /// <summary> /// The rate at which the Window is to be flashed,in milliseconds. If Zero,the function uses the default cursor blink rate. /// </summary> public uint dwTimeout; } public enum FlashWindowFlags : uint { /// <summary> /// Stop flashing. The system restores the window to its original state. /// </summary> FLASHW_STOP = 0,/// <summary> /// Flash the window caption. /// </summary> FLASHW_CAPTION = 1,/// <summary> /// Flash the taskbar button. /// </summary> FLASHW_TRAY = 2,/// <summary> /// Flash both the window caption and taskbar button. /// This is equivalent to setting the FLASHW_CAPTION | FLASHW_TRAY flags. /// </summary> FLASHW_ALL = 3,/// <summary> /// Flash continuously,until the FLASHW_STOP flag is set. /// </summary> FLASHW_TIMER = 4,/// <summary> /// Flash continuously until the window comes to the foreground. /// </summary> FLASHW_TIMERNOFG = 12 } public static bool FlashWindow(IntPtr hWnd,FlashWindowFlags fOptions,uint FlashCount,uint FlashRate) { if(IntPtr.Zero != hWnd) { FLASHWINFO fi = new FLASHWINFO(); fi.cbSize = (uint)Marshal.SizeOf(typeof(FLASHWINFO)); fi.dwFlags = fOptions; fi.uCount = FlashCount; fi.dwTimeout = FlashRate; fi.hwnd = hWnd; return FlashWindowEx(ref fi); } return false; } public static bool StopFlashingWindow(IntPtr hWnd) { if(IntPtr.Zero != hWnd) { FLASHWINFO fi = new FLASHWINFO(); fi.cbSize = (uint)Marshal.SizeOf(typeof(FLASHWINFO)); fi.dwFlags = (uint)FlashWindowFlags.FLASHW_STOP; fi.hwnd = hWnd; return FlashWindowEx(ref fi); } return false; }