Following are some listings to be used as a quick reference to common Windows 7 Taskbar features using Windows API Code Pack.
The code in this post is based on previous work by Yochay and Sasha.
Setting the process Application ID
TaskbarManager.Instance.ApplicationId = "TaskbarManaged";
Note: This should be done before the window is shown, a good place is on form load.
Setting the Application ID of a window
or in WPF:
Adding a file into the Recent category on the JumpList
_jumpList = JumpList.CreateJumpList();
Note: You must register (associate) the file type with your application for this to work. Note 2: If you use the common dialogs to open a file it will get added automatically to the recent list.
Adding tasks to the JumpList
IJumpListTask task1 = new JumpListLink(filePath, taskTitle)
Arguments = arguments,
WorkingDirectory = workingDirectory
IJumpListTask separator = new JumpListSeparator();
IJumpListTask task2 = ...
_jumpList.AddUserTasks(task1, separator, task2);
Adding custom categories
JumpListCustomCategory category = new JumpListCustomCategory("My Category");
IJumpListItem item1 = new JumpListLink(path1, title1);
IJumpListItem item2 = new JumpListLink(path2, title2);
Creating Thumbnail Toolbars
ThumbnailToolbarButton button1 = new ThumbnailToolbarButton(icon, tooltip);
button1.Click += delegate
Setting Overlay Icon
Setting Progress State and Value
TaskbarManager.Instance.SetProgressValue(currentValue, maximumValue, form.Handle);
Customizing Live Thumbnail
TabbedThumbnail preview = new TabbedThumbnail(parentForm.Handle, childForm.Handle);
preview.TabbedThumbnailBitmapRequested += (o, e) =>
Bitmap bmp = new Bitmap(width, height);
e.Handled = true;
A drawback in Windows API Code Pack v1.0.1
When using the Windows API Code Pack library to add Taskbar features to your WinForms application you must add a references to the following WPF DLLs: PresentationCore.dll, PresentationFramework and WindowsBase.dll
The reason is that every Taskbar function in the library that has an handle in its arguments comes in pair, the first expects a native IntPtr (used with myWinForm.Handle property) and the second expects a WPF Window object. Since we use a class that expects WPF types in its arguments (Taskbar) we must add the WPF DLLs to our WinForms project.
A Bug in Windows API Code Pack v1.0.1
ThumbnailToolbarButton Click event isn’t fired when process is running elevated (i.e. as Administrator)
The problem is that some of the taskbar messages doesn’t pass thru the Windows UIPI mechanism. A quick fix is to add the following line to the load event:
private void Form_Load(object sender, EventArgs eventargs)
The definition of this method is brought here:
#region Fix bug in Windows API Code Pack
[DllImport("user32.dll", EntryPoint = "RegisterWindowMessage", SetLastError = true,
CharSet = CharSet.Unicode)]
private static extern uint RegisterWindowMessage([MarshalAs(
UnmanagedType.LPWStr)] string lpString);
[DllImport("user32.dll", SetLastError = true)]
private static extern IntPtr ChangeWindowMessageFilter(uint message, uint dwFlag);
private const uint MSGFLT_ADD = 1;
private const uint WM_COMMAND = 0x0111;
private const uint WM_SYSCOMMAND = 0x112;
private const uint WM_ACTIVATE = 0x0006;
private static void AllowTaskbarWindowMessagesThroughUIPI()
uint WM_TaskbarButtonCreated = RegisterWindowMessage("TaskbarButtonCreated");
#endregion Fix bug in Windows API Code Pack
That’s it for now,
Arik Poznanski is a Senior Consultant and Instructor at Sela Technology Center. He completed two B.Sc. degrees in Mathematics & Computer Science, summa cum laude, from the Technion in Israel.
Arik has extensive knowledge and experience in many Microsoft technologies, including .NET with C#, WPF, Silverlight, WinForms, Interop, COM/ATL programming, C++ Win32 programming and reverse engineering (assembly, IL).