By Kang-Tsung Chang
If you are able to take your wisdom of ArcGIS to the subsequent point, you then have to how to paintings with ArcObjects. yet with millions of gadgets, houses, and techniques, how will you ever desire to kind during the ArcObjects version diagrams?The first variation of Chang's Programming ArcObjects with VBA: A Task-Oriented procedure gave us the reply. The author's task-oriented method exhibits you the way to kind during the substantial ArcObjects assortment via analyzing purely the gadgets, houses, and techniques you want to practice particular tasks.What's new within the moment edition?This version provides macros and causes for the hot Geoprocessing item brought in ArcGIS 9.x. rather than treating this new function in separate chapters, the writer comprises Geoprocessing code into the present chapters. The code appears to be like comfortably in bins that let you simply examine pattern macros.Get began with Ready-to-Use CodeThe significant other CD-ROM includes ninety five whole ArcObjects macros and 33 Geoprocessing macros, besides datasets to execute the code. every one application starts off with a quick utilization description and a listing of key houses and techniques, via the directory and clarification of the code itself.Regardless of your programming event, Programming ArcObjects with VBA: A Task-Oriented technique, moment version offers the major to free up the facility and flexibility of utilizing ArcObjects that can assist you deal with GIS actions.
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Additional info for Programming ArcObjects with VBA: A Task-Oriented Approach, Second Edition
If such a condition is determined to exist, the Exit Sub statement placed after Else can terminate the execution of a macro immediately. 2 Select Case Statement The If…Then…Else statement can become confusing and untidy if more than three or four possible outcomes exist. An alternative is to use the Select Case statement, which has the following syntax: Select Case test_expression [Case expression_list-n [statements-n]]… [Case Else [else_statements]] End Select ArcObjects codes the data type of a field in numeric values from 0 to 8.
If the programmer prefers to use the keyword, the inverse n statement can be changed to: Call Inverse (n) The next example lets the Start sub call a function instead of a sub to accomplish the same task: Private Sub Start () Dim n As Integer Dim dd As Double n = InputBox(“Type a number”) ' Call the Inverse function and assign the return value to dd. fm Page 28 Thursday, July 19, 2007 10:33 PM 28 PROGRAMMING ARCOBJECTS WITH VBA: A TASK-ORIENTED APPROACH Private Function Inverse (m) As Double Dim d As Double d=1/m Inverse = d ' Return the d value.
Again, the prefixes of lbl, cbo, and cmd are the recommended naming conventions for labels, combo boxes, and command buttons respectively. 2 Associating Controls with Procedures After the design of the frmAreaUnits form is complete, the next task is to associate the event procedures with the form and its controls: 1. Double-click the form to open the Code window. ) At the top of the Code window are two dropdown lists. On the left is the object (control) list that includes the form and its controls.
Programming ArcObjects with VBA: A Task-Oriented Approach, Second Edition by Kang-Tsung Chang