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CHAPTER 9 INTRODUCTION TO VISUAL BASIC EXPRESS AND WINDOWS FORMS
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The seventh element value of 1 specifies a variable width for the seventh and last column of the report. When using the TextFieldParser class with fixed-width reports, it is standard to designate the last column as having a variable width. The third Dim statement initializes the maxColWidths Integer array with maximum column widths for the report generated by VBE. This array is used to compute the number of blanks to append so that columns stay in alignment. The maxColWidths array element values match those in the SalesWidths array, except for the last column. The last maxColWidths array element equals the maximum number of characters that you want in the last column of the report from VBE. Dim strPathFile As String = "c:\ProSSEApps\09\" & _ "SalesByPersonTerritoryRegion.rpt" Dim SalesWidths() As Integer = {15, 15, 14, 10, 18, 22, -1} Dim maxColWidths() As Integer = {15, 15, 14, 10, 18, 22, 21} All the rest of the code in Button2_Click appears within a Using...End Using block. The Using statement in a Using...End Using block can acquire a resource for use within the code inside the Using...End Using block. In this case, the Using statement reserves an instance of the TextFieldParser class with the name of Reader. The TextFieldType property of the TextFieldParser class designates whether to process fixed-width or delimited data, such as comma-delimited data. The following code segment indicates the use of the TextFieldParser for a fixed-width report. If you use a TextFieldParser instance to process a fixed-width report, as in the current case, then you need to specify column widths for successive report fields. You can specify column widths with the SetFieldWidths method for a TextFieldParser instance (Reader). This sample uses the widths in the SalesWidths array. The ReadFields method of the TextFieldParser class returns an array of column values for the current row and advances the text file pointer to the next row. The Dim statement for the currentRow String array declares an array to hold return values from the ReadFields method. The int1 variable, declared in the line following the Dim statement for the currentRow array, tracks the current column being processed. This variable points at an appropriate element in the maxColWidths array for the current output column being generated. A Do...Loop statement contains the bulk of the processing code within the Using...End Using block. There are no conditions on the Do or Loop elements of the statement because the condition testing for an exit from the loop occurs within the code in the Do...Loop statement. The Do...Loop statement contains a Try...Catch...Finally statement with two Catch clauses. The Try block clause reads a row of column values with the ReadFields method from the input report, stores the result in the currentRow array, and writes the array elements to the Quick Console window one column at a time. The syntax for the Try block shows you how to extract individual column values from a fixed-width report. The ReadFields method can generate a single Exception type the Microsoft.VisualBasic.FileIO.MalformedLineException. However, it can occur for multiple instances, such as no more data or badly formed data.
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CHAPTER 9 INTRODUCTION TO VISUAL BASIC EXPRESS AND WINDOWS FORMS
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The first Catch clause handles a MalformedLineException resulting from no more data. In this case, Reader.EndOfData is True. A When clause in the Catch clause evaluates this condition. If the condition is True, the procedure exits the Do loop, which in turn passes control to the End Using statement. The second Catch clause handles a line with values that cannot be read with the settings for the TextFieldParser instance. This outcome also throws a MalformedLineException object. The Debug.Print statement writes a message to the Immediate window about the line causing the error. This output stream allows a user to know which lines were not processed from the original report. The Finally clause inserts a carriage return after each row in the default Output window (see Figure 9-14). The rows of the report are double-spaced. No special coding is required for this benefit.
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Note The Using statement is a new Visual Basic statement introduced with Visual Basic 2005. The syntax for this statement is Using resource specification...statements using the resource...End Using. The resource specified is available after the Using clause up until the End Using clause, which disposes of the resource. The Using statement is particularly convenient for automatically disposing of unmanaged resources, such as a file handle or an ADO.NET Connection object (see 12). This is because the .NET Framework disposes of a resource specified in the Using clause during the execution of the End Using clause.
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Using Reader As New Microsoft.VisualBasic.FileIO. _ TextFieldParser(strPathFile) Reader.TextFieldType = _ Microsoft.VisualBasic.FileIO.FieldType.FixedWidth Reader.SetFieldWidths(SalesWidths) Dim currentRow As String() Dim int1 As Integer Do Try currentRow = Reader.ReadFields() Dim currentField As String For Each currentField In currentRow Console.Write(currentField & _ StrDup((maxColWidths(int1) - currentField.Length), " ")) int1 += 1 Next int1 = 0 Catch ex1 As _ Microsoft.VisualBasic.FileIO.MalformedLineException _ When Reader.EndOfData = True Exit Do Catch ex1 As _ Microsoft.VisualBasic.FileIO.MalformedLineException _ When Reader.EndOfData = False Debug.Print("Line " & ex1.Message & _ "is not valid and will be skipped.") Finally Console.WriteLine(ControlChars.Cr) End Try Loop End Using
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