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When we need this extra functionality, we need to handle the extra messages and call the extra functions For example, in 1x, a tree view click handler may want to send the TVM_HITTEST message to see where on a node the user clicked, because it wants to act differently when the user clicks the node s +/- button than when the user clicks the node s icon or text (In 20, the TreeView class has a HitTest method) Calling Win32 functions like SendMessage is a matter of using the (SystemRuntime InteropServices) DllImport attribute to call external functions from DLLs like Win32 and User32, almost like in Delphi In fact, the Win32 Delphi import units can be a useful guide to generating a DllImport declaration for a Win32 function, if Google doesn t provide a pretested declaration.

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Handling extra messages works a bit differently in the VCL than in WinForms With VCL forms, handling extra messages is a simple matter of adding message wm_Whatever after a method with the right procedure wmWhatever(var Message: TMessage) prototype With WinForms, you have to override the form object s protected void WndProc(ref Message m) and dispatch on the message s Msg integer You can do dispatch via a long switch statement as in Windows 1x, but you don t have to For example, the 15\WndProc C# project includes code that defines MessageAttribute and MessageMap classes The MessageMap class s constructors find void MessageName(ref Message M) methods with a [Message(int)] attribute, and add them to a private Dictionary<int, MessageHandler> The MessageHandlingForm initializes its MessageMap in its constructor.

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A contacts list lets you place the names and important contact information about people you work with in a convenient-to-reference spot on your site. Figure 2-2 shows a typical contacts list labeled as Office Contacts. It displays the first and last name of each contact along with his business phone and e-mail address.

getMessage() getCode() getFile() getLine() getTrace() getTraceAsString() __toString()

The form s WndProc then looks up each message in its MessageMap, and calls registered message handlers, almost like in Delphi: protected override void WndProc(ref Message m) { baseWndProc(ref m); if (MessagesIsAssigned(mMsg)) Messages[mMsg](ref m); }.

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Figure 2-2. Using a list to display your contacts If you re a newcomer to SharePoint, you may wonder if you must display all columns in a list. The simple answer is no. A list consists of a collection of columns (think of columns as fields) arranged by items (think of items as rows). Then you create or modify views of that list to display the specific columns you want displayed. You can also sort and filter the list if desired. A list can have many views, with each one displaying a different column subset, a different sort order, or a different filter. In this contacts list example, the view only shows four columns. Not only are there other fields available to you that are not displayed on this list, but you can also add custom fields to your list specific to your needs, and I ll show you how to add new columns in the section Building a Custom List and modify existing columns in the section Modifying the Columns in Your List later in this chapter. The contacts list includes two hyperlinks. The first hyperlink, on the contact s last name, displays a page containing additional data for this contact. Here you can update the contact s information or set an alert to notify you if the contact s information changes. The second hyperlink, on the e-mail address field, opens your e-mail application and creates a blank message form for this contact.

You can inherit from the WndProc project s MessageHandlingForm, or you can add a MessageMap and this WndProc to your own forms. The WndProc project s ClipboardWatcher form is a MessageHandlingForm that uses message handlers and DllImport to add itself to the clipboard viewer chain, so it can examine the clipboard contents every time the user puts new data on the clipboard. You can use this to enable a Paste command only when the clipboard contains data in a format that you can currently paste.

Get the message string that was passed to the constructor. Get the code integer that was passed to the constructor. Get the file in which the exception was generated. Get the line number at which the exception was generated. Get a multidimensional array tracing the method calls that led to the exception, including method, class, file, and argument data. Get a string version of the data returned by getTrace(). Called automatically when the Exception object is used in string context. Returns a string describing the exception details.