INSERT SNIPPET Insert 13, Snippet Item 5. in VB.NET

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Private Sub LoadReportGroup(ByVal groupNode As Xml.XmlNode, _ ByVal indentLevel As Integer) ' ----- Add the groups and items at this level, ' and recurse as needed. Dim scanNode As Xml.XmlNode Dim detailNode As Xml.XmlNode Dim reportEntry As ReportItem ' ----- Process each item or group. For Each scanNode In groupNode.ChildNodes ' ----- Build a content item for the list. reportEntry = New ReportItem reportEntry.Indent = indentLevel ' ----- Get the display name. detailNode = scanNode.SelectSingleNode("displayText") If (detailNode Is Nothing) Then Continue For reportEntry.DisplayText = Trim(detailNode.InnerText)
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If (scanNode.Name = "reportGroup") Then ' ----- Start a new display group. reportEntry.ItemType = ReportItemEnum.GroupLabel AllReports.Items.Add(reportEntry) ' ----- Recurse to child items. LoadReportGroup(scanNode, indentLevel + 1) ElseIf (scanNode.Name = "reportItem") Then ' ----- This is an item. Record its location. detailNode = scanNode.SelectSingleNode("reportPath") If Not (detailNode Is Nothing) Then _ reportEntry.ReportPath = _ Trim(detailNode.InnerText) ' ----- Get any command-line arguments. detailNode = scanNode.SelectSingleNode("reportArgs") If Not (detailNode Is Nothing) Then _ reportEntry.ReportArgs = _ Trim(detailNode.InnerText) ' ----- Get any item-specific flags. detailNode = scanNode.SelectSingleNode("reportFlags") If Not (detailNode Is Nothing) Then ' ---- "U" adds "-u loginid" to the command. If (InStr(UCase(detailNode.InnerText), "U") > 0) _ And (LoggedInUserName <> "") Then _ reportEntry.ReportArgs = _ Trim(reportEntry.ReportArgs & " -u " & _ LoggedInUserName) End If ' ----- Store the full description. detailNode = scanNode.SelectSingleNode("description") If Not (detailNode Is Nothing) Then _ reportEntry.Description = _ Trim(detailNode.InnerText) ' ----- So, what type of entry is it If (scanNode.Attributes("type").Value = _ "built-in") Then ' ----- Built-in program. Check for valid ID. If (IsNumeric(reportEntry.ReportPath) = False) Or _ (Val(reportEntry.ReportPath) < 1) Or _ (Val(reportEntry.ReportPath) > _ CInt(ReportItemEnum.BuiltInStatistics)) Then _ Continue For reportEntry.ItemType = CType(CInt( _ reportEntry.ReportPath), ReportItemEnum) AllReports.Items.Add(reportEntry) ElseIf (scanNode.Attributes("type").Value = _ "program") Then ' ----- EXE program-based report. If (reportEntry.ReportPath = "") Then Continue For reportEntry.ItemType = ReportItemEnum.ExeProgram
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13: XML
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AllReports.Items.Add(reportEntry) ElseIf (scanNode.Attributes("type").Value = _ "url") Then ' ----- URL-based report. If (reportEntry.ReportPath = "") Then Continue For reportEntry.ItemType = ReportItemEnum.UrlProgram AllReports.Items.Add(reportEntry) End If End If Next scanNode Return ErrorHandler: GeneralError("ReportSelect.LoadReportGroup", _ Err.GetException( )) Resume Next End Sub
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Add the form s Load event, which loads in the content from the configuration file.
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Private Sub ReportSelect_Load(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles MyBase.Load ' ----- Display the list of reports. RefreshReportList( ) End Sub
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Running the Reports
Now that all of the groups and items appear in the list, we have to run the actual reports. The ActRun button s Click event handles this duty. For now, we will just add the framework to support the calling of each report. The built-in reports will be added in 21.
INSERT SNIPPET Insert 13, Snippet Item 7.
Private Sub ActRun_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles ActRun.Click ' ----- Run the selected report. Dim reportEntry As Library.ReportItem On Error GoTo ErrorHandler ' ----- Make sure a report is selected. If (AllReports.SelectedIndex = -1) Then
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MsgBox("Please select a report from the list.", _ MsgBoxStyle.OKOnly Or MsgBoxStyle.Exclamation, _ ProgramTitle) Return End If ' ----- Different code for each type of entry. reportEntry = CType(AllReports.SelectedItem, _ Library.ReportItem) Me.Cursor = Windows.Forms.Cursors.WaitCursor Select Case reportEntry.ItemType Case ReportItemEnum.GroupLabel ' ----- No report for group entries. MsgBox("Please select a report from the list.", _ MsgBoxStyle.OKOnly Or MsgBoxStyle.Exclamation, _ ProgramTitle) Case ReportItemEnum.BuiltInCheckedOut ' ----- Items Checked Out ' TODO: Write BasicReportCheckedOut( ) Case ReportItemEnum.BuiltInOverdue ' ----- Items Overdue ' TODO: Write BasicReportOverdue( ) Case ReportItemEnum.BuiltInMissing ' ----- Items Missing ' TODO: Write BasicReportMissing( ) Case ReportItemEnum.BuiltInFinesOwed ' ----- Fines Owed by Patrons ' TODO: Write BasicReportFines( ) Case ReportItemEnum.BuiltInStatistics ' ----- Library Database Statistics ' TODO: Write BasicReportStatistics( ) Case ReportItemEnum.ExeProgram ' ----- Start a program. Process.Start("""" & reportEntry.ReportPath & _ """ " & reportEntry.ReportArgs) Case ReportItemEnum.UrlProgram ' ----- Start a URL. Process.Start(reportEntry.ReportPath) End Select Me.Cursor = Windows.Forms.Cursors.Default Return ErrorHandler: GeneralError("ReportSelect.ActRun_Click", _ Err.GetException( )) Resume Next End Sub
For external reports, the event handler calls the Process.Start method. This amazing method accepts either a standard command-line expression, or any valid URL or web page address.
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