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Develop QR Code 2d barcode in Objective-C Considering and Ignoring

Note: Recall that in chapter 5 we supported the IDisposable interface in our PhotoAlbum class, which allows us to employ the using statement here. 9 If the album could not be opened or is empty, then cancel the operation.

ThisDrawing.Utility.GetEntity objEntity, varPick, "Select an entity" If objEntity Is Nothing Then MsgBox "No entity was selected" Exit Sub ' exit if no entity picked End If strLayerName = InputBox("Enter a new Layer name: ") If "" = strLayerName Then Exit Sub ' exit if no name entered Set objLayer = ThisDrawing.Layers(strLayerName) If objLayer Is Nothing Then MsgBox "Layer was not recognized" Exit Sub ' exit if layer not found End If objEntity.Layer = strLayerName ' else change entity layer End Sub You can determine if a specific layer is active by comparing the string to the ActiveLayer.Name property: If ThisDrawing.ActiveLayer.Name = "Walls" Then ... This is a pretty common operation, so make it a function. You ll also want to allow for various combinations of upper- and lowercase letters, as AutoCAD does: Public Function IsLayerActive(strLayerName As String) As Boolean IsLayerActive = False 'assume failure If 0 = StrComp(ThisDrawing.ActiveLayer.Name, strLayerName, _ vbTextCompare) Then IsLayerActive = True End If End Function This IsLayerActive function checks whether a particular string corresponds to the active layer name. True will be returned if the layer is active, otherwise False will be returned. The following gets a layer name from the user and employs the new function to see if it s active:

' file : hello.vb ' compile : vbc hello.vb Imports System module Hello sub main() Console.WriteLine("Hello from VB.NET") end sub end module

Like graphics context properties, the methods to draw objects are scattered among the objects themselves. The exceptions are a few C functions that fill rectangles or draw multipart images. The most commonly used C functions are listed in Table 20-3. Table 20-3. Common Cocoa Drawing Functions

The MOM Remote Prerequisite Checker is a version of the MOM Prerequisite Checker that can be run against a remote server. This is useful if you are not able to interactively log onto a server, but want to verify that it has the necessary prerequisites to allow an install of MOM. A screenshot of the utility is shown in Figure 11-4.

This utility stored procedure has been designed to simplify two tasks described in this technique: Move a large number of nonclustered indexes into a dedicated filegroup, as part of reorganizing your database in preparation to perform PRIMARY (tablesonly) filegroup-based backups. Generate a script to re-create nonclustered indexes during the restore process if necessary. The workflow of this stored procedure iterates over a database s indexes, generating a

PS (3) > $indexes = 2,3,4,5 PS (4) > $a[$indexes] 3 4 5 6

We display the form as a modal dialog to force the user to close this window before continuing with the application. Note that a Close button is not provided, so the user must close the form using the title bar, the system menu, or the keyboard shortcut Alt+F4.2 After the ShowDialog method returns, we clean up the system resources assigned to the form by calling the Dispose method.

Note: If you are not using Visual Studio, create the new menu manually, and set the Index property for each of the File, Edit, and View menus to 0, 1, and 2 respectively.