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Chapter 15. Advanced Topics in VB. Advanced Topics in VB. Using ActiveX controls Linking from VB to a Web site Include DLL procedures in your projects Understand Windows API Use OLE container VB and VBA Differentiating between MDI and SDI interfaces. Introduction.

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chapter 15

Chapter 15

Advanced Topics in VB

advanced topics in vb
Advanced Topics in VB
  • Using ActiveX controls
  • Linking from VB to a Web site
  • Include DLL procedures in your projects
  • Understand Windows API
  • Use OLE container
  • VB and VBA
  • Differentiating between MDI and SDI interfaces
introduction
Introduction
  • Windows programs have access to other objects through
    • ActiveX controls
    • OLE (Object Linking and Embedding)
    • DLLs (Dynamic Link Libraries)
  • MDI interface allows multiple forms within an application—such as Excel or Word
activex controls
ActiveX Controls
  • Refers to executable files, controls (COM), and DLLs that are used in multiple applications
  • Microsoft refers to any controls as ActiveX controls.
  • They can be home brew or part of a package
  • VB controls are called intrinsic controls
  • Controls that are added are called components
activex controls1
ActiveX Controls
  • Tabbed dialog box has several properties that can be set at design or run time
  • Click the builder button in the tab’s Custom property
  • Place controls on tabbed dialog boxes by manually drawing them—double-clicking a tool places the control on every tab page
activex controls cont d
ActiveX Controls (cont'd)
  • You can also purchase ActiveX controls
  • ActiveX control files end in .OCX or .VBX
  • Project, Components lists controls—most are .OCX
  • The Web Browser control allows you to browse the Web from VB—control is one of the extra components
creating activex controls
Creating ActiveX Controls
  • Select ActiveX control, ActiveX EXE or ActiveX DLL in the New Project dialog box
  • Create an ActiveX control comprising a calendar control, a text box, and a command button
dynamic link libraries
Dynamic Link Libraries
  • Libraries store frequently used procedures
  • Windows uses dynamic link libraries (DLLs) so store collections of executable procedures
  • Windows DLL procedures are available to VB programs
  • DLLs that are used to move/resize windows are called APIs (application programming interfaces)
  • Most DLLs require arguments that you pass to them
calling a dll procedure
Calling a DLL Procedure
  • Call a procedure within the scope of a declare statement
  • Arguments to procedure can be constants or variables
  • Windows provides an API viewer to get help on DLL procedures
object linking and embedding
Object Linking and Embedding
  • OLE allows you to link or embed objects from another application into VB project
  • Linking: access object maintained by another program; shared object stored elsewhere
  • Embedding: object and ref. to application managing object are stored in your project
visual basic for applications vba
Visual Basic for Applications (VBA)
  • Microsoft office products include VBA for writing procedures to automate office applications (Excel, Word, etc.)
  • Record Excel macros that accomplish a series of steps
  • Macros are stored as VBA code
  • Open code and inspect it
multiple document interface mdi
Multiple Document Interface (MDI)
  • MDI interface is one in which several child forms can be open with a larger, parent form
  • Word and Excel both are examples of MDI
  • You can open, close, and resize each child window (form)
defining shortcut menus
Defining Shortcut Menus
  • Create shortcut menus (right-click accessible menus) with the Menu Editor
  • Clear the visible checkbox of a shortcut menu so it is invisible until the user calls for it
  • Code is required to display the shortcut menu
the report designer
The Report Designer
  • VB’s Report Designer creates a printed report
  • Reports based on a database use the Data Environment
  • Once created, use Show to display it on screen or print it with the PrintReport method
  • A report design is its template
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