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The Library Project uses Visual Basic s settings system to track user-specific state values maintained between uses of the application. All of these settings are stored in an XML file in the user s portion of the C:\Documents and Settings (or equivalent) directory in a format dictated by .NET. The following is a list of the settings recognized by the Library program:
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DBConnection (String)
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A properly formatted connection string that identifies the SQL Server database used by the application. If missing, the application will prompt for the location of the database on startup.
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HelpFile (String)
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Indicates the UNC or drive letter-based location of the basic application online help file, with a .chm extension.
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HelpFileAdmin (String)
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Indicates the UNC or drive letter-based location of the administrative application online help file, with a .chm extension.
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HideLogin (Boolean)
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Indicates whether the Login button in the upper-right corner of the main Library form should be hidden from view when in patron (nonadministrative) mode. Use True to hide the button or False to show the button. If this field is missing, False is assumed.
MainFormPosition (System.Drawing.Point)
The position of the upper-left corner of the main Library form. This value is updated each time the application closes.
ReceiptPostlude (String)
Any raw character data to send to the receipt printer at the end of each ticket. This text may include the following special characters:
\n
A newline character (ASCII 10)
\r
A carriage return character (ASCII 13)
\e
An escape character (ASCII 27)
\x
Any ASCII value, where is a two-character hexadecimal code
\\
The backslash character ( \ )
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14: Application Settings
ReceiptPrinter (String)
The UNC pathname to the receipt printer used by this workstation to print out patron checkout receipts and payment receipts.
ReceiptWidth (Integer)
The width, in characters, of each line on the receipt printer. If missing or empty, the program uses a default width of 40 characters.
ReportConfig (String)
Indicates the UNC or drive letter-based location of the XML report configuration file. This file has the XML format described in the Report Configuration File section of this document. This file indicates the reports available in the application.
SettingsUpgraded (Boolean)
When upgrading the application from an older release, this flag indicates whether the settings associated with that older release have already been upgraded into this new version. It defaults to False for all new releases.
UseReceipts (Boolean)
Indicates whether printed receipts are to be used at this workstation. If this field is missing, False is assumed. This technical description appears in the Technical Resource Kit document, originally developed in 4 and updated in subsequent chapters. Some of the content added here refers to features and technical content that won t be added until later chapters, so don t spend too much time thinking about features that you thought you already forgot.
Add the Settings
Since we know all of the settings we will add to the application, let s add them now. Open the project properties window and select the Settings tab. Add each setting to the application using Table 14-1 as a guide. If a setting in Table 14-1 has no listed value, leave the Value field blank as well in the settings editor.
Table 14-1. Default settings for the Library Project Name
DBConnection HelpFile HelpFileAdmin HideLogin MainFormPosition ReceiptPostlude ReceiptPrinter
Type
String String String Boolean System.Drawing.Point String String
Scope User User User User User User User
Value
False
Project |
Table 14-1. Default settings for the Library Project (continued) Name
ReceiptWidth ReportConfig SettingsUpgraded UseReceipts
Type
Integer String Boolean Boolean
Scope User User User User
Value
False False
Make sure you type the settings names as listed. The application will not be able to match up incorrectly spelled names.
Positioning the Main Form
I showed you how to link a form s or control s property value to one of the settings earlier in this chapter, so let s do it for real in the project. We ll link the main form s Location property to the MainFormPosition setting. Just to refresh your memory, follow these steps to enable the link: 1. Open MainForm.vb in Design view. 2. Make sure the form itself is selected, not one of its subordinate controls. 3. In the Properties panel, expand the (ApplicationSettings) property. 4. Select the (PropertyBinding) subproperty, and click on the ... button in its value area. 5. Locate the Location property in the binding list. 6. Select the MainFormPosition setting for the Location property s value. It should be the only setting available since it is the only one we defined as type System. Drawing.Point. 7. Click the OK button to enable the link.
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