快速录制屏幕上的指定区域(Screen to Gif 源码)

【实例简介】

Screen to Gif 是一款方便好用的小软件，可以用来快速录制屏幕上的指定区域，将其直接保存为 GIF 动画文件。

【实例截图】

【核心代码】

	





	private void App_Startup(object sender, StartupEventArgs e) 



	{ 



	Global.StartupDateTime = DateTime.Now; 



	



	//Unhandled Exceptions. 



	AppDomain.CurrentDomain.UnhandledException  = CurrentDomain_UnhandledException; 



	AppDomain.CurrentDomain.AssemblyResolve  = CurrentDomain_AssemblyResolve; 



	



	//Increases the duration of the tooltip display. 



	ToolTipService.ShowDurationProperty.OverrideMetadata(typeof(DependencyObject), new FrameworkPropertyMetadata(int.MaxValue)); 



	



	var version = FrameworkHelper.GetFrameworkVersion(); 



	



	if (version > new Version(4, 7, 2)) 



	SetSecurityProtocol(); 



	



	//Parse arguments. 



	Argument.Prepare(e.Args); 



	



	LocalizationHelper.SelectCulture(UserSettings.All.LanguageCode); 



	ThemeHelper.SelectTheme(UserSettings.All.MainTheme); 



	



	//Listen to changes in theme. 



	SystemEvents.UserPreferenceChanged  = SystemEvents_UserPreferenceChanged; 



	



	#region Download mode 



	



	if (Argument.IsInDownloadMode) 



	{ 



	var downloader = new Downloader 



	{ 



	DownloadMode = Argument.DownloadMode, 



	DestinationPath = Argument.DownloadPath 



	}; 



	downloader.ShowDialog(); 



	



	Environment.Exit(90); 



	return; 



	} 



	



	#endregion 



	



	#region Settings persistence mode 



	



	if (Argument.IsInSettingsMode) 



	{ 



	SettingsPersistenceChannel.RegisterServer(); 



	return; 



	} 



	



	#endregion 



	



	#region If set, it allows only one instance per user 



	



	//The singleton works on a per-user and per-executable mode. 



	//Meaning that a different user and/or a different executable intances can co-exist. 



	//Part of this code wont work on debug mode, since the SetForegroundWindow() needs focus on the foreground window calling the method. 



	if (UserSettings.All.SingleInstance) 



	{ 



	try 



	{ 



	using (var thisProcess = Process.GetCurrentProcess()) 



	{ 



	var user = System.Security.Principal.WindowsIdentity.GetCurrent().User; 



	var name = thisProcess.MainModule?.FileName ?? Assembly.GetEntryAssembly()?.Location ?? "ScreenToGif"; 



	var location = Convert.ToBase64String(Encoding.UTF8.GetBytes(name)); 



	var mutexName = (user?.Value ?? Environment.UserName)   "_"   location; 



	



	_mutex = new Mutex(true, mutexName, out _accepted); 



	



	//If the mutext failed to be accepted, it means that another process already openned it. 



	if (!_accepted) 



	{ 



	var warning = true; 



	



	//Switch to the other app (get only one, if multiple available). Use name of assembly. 



	using (var process = Process.GetProcessesByName(thisProcess.ProcessName).FirstOrDefault(f => f.MainWindowHandle != thisProcess.MainWindowHandle)) 



	{ 



	if (process != null) 



	{ 



	var handles = Util.Native.GetWindowHandlesFromProcess(process); 



	



	//Show the window before setting focus. 



	Util.Native.ShowWindow(handles.Count > 0 ? handles[0] : process.Handle, Util.Native.ShowWindowEnum.Show); 



	



	//Set user the focus to the window. 



	Util.Native.SetForegroundWindow(handles.Count > 0 ? handles[0] : process.Handle); 



	warning = false; 



	



	InstanceSwitcherChannel.SendMessage(e.Args); 



	} 



	} 



	



	//If no window available (app is in the system tray), display a warning. 



	if (warning) 



	Dialog.Ok(LocalizationHelper.Get("S.Warning.Single.Title"), LocalizationHelper.Get("S.Warning.Single.Header"), LocalizationHelper.Get("S.Warning.Single.Message"), Icons.Info); 



	



	Environment.Exit(0); 



	return; 



	} 



	



	//If this is the first instance, register the inter process channel to listen for other instances. 



	InstanceSwitcherChannel.RegisterServer(); 



	} 



	} 



	catch (Exception ex) 



	{ 



	LogWriter.Log(ex, "Impossible to check if another instance is running"); 



	} 



	}