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06.24.2008 at 02:04PM PDT, ID: 23512646
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VB application locks up doing long procedure.

Asked by xneo27 in Visual Basic Programming, Windows Programming, .NET

Tags: VB.NET

I am creating a small application that reads a file given to me with new book listings for my libraries online articles. The application uses this information to create several RSS Feeds. there is one really long loop where lots of reading and writing to and from files occurs, during this loop sometimes the application will lock up. What should I do differently, should I use some sort of pause to keep it from locking up?Start Free Trial 
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Public Class Form1
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        OpenFileDialog1.ShowDialog()
        TextBox1.Text = OpenFileDialog1.FileName
    End Sub
 
 
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
 
    End Sub
 
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        If intStep = 0 Then
            intStep = 1
            Label1.Text = "Step 1"
            Label2.Visible = True
            TextBox1.Visible = True
            Button1.Visible = True
            Button3.Visible = True
            Label3.Visible = False
        ElseIf intStep = 1 Then
            If TextBox1.Text = "" Then
                MsgBox("Please select the update file before pressing Next.")
            Else
                If OpenFileDialog1.CheckFileExists = True Then
                    strFilename = TextBox1.Text
                    intStep = 2
                    Label1.Text = "Step 2"
                    Label2.Visible = False
                    TextBox1.Visible = False
                    Button1.Visible = False
                    TextBox2.Visible = True
                    Label4.Visible = True
                    Button4.Visible = True
                    howManyLines()
 
                Else
                    MsgBox("This File does not exist, please select the correct file.")
                End If
            End If
        ElseIf intStep = 2 Then
            If TextBox2.Text = "" Then
                MsgBox("Please select the update file before pressing Next.")
            Else
                intStep = 3
                Label1.Text = "Step 3"
                TextBox2.Visible = False
                Label4.Visible = False
                Button4.Visible = False
                Label5.Visible = True
                Button2.Visible = False
                Button5.Visible = True
                outFilePath = TextBox2.Text
            End If
        End If
    End Sub
 
    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        If intStep = 1 Then
            intStep = 0
            Label1.Text = ""
            Label2.Visible = False
            TextBox1.Visible = False
            Button1.Visible = False
            Button3.Visible = False
            Label3.Visible = True
        ElseIf intStep = 2 Then
            intStep = 1
            Label1.Text = "Step 1"
            Label2.Visible = True
            TextBox1.Visible = True
            Button1.Visible = True
            TextBox2.Visible = False
            Label4.Visible = False
            Button4.Visible = False
        ElseIf intStep = 3 Then
            intStep = 2
            Label1.Text = "Step 2"
            TextBox2.Visible = True
            Label4.Visible = True
            Button4.Visible = True
            Label5.Visible = False
            Button2.Visible = True
            Button5.Visible = False
        End If
    End Sub
 
    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
 
    End Sub
 
    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        FolderBrowserDialog1.ShowDialog()
        TextBox2.Text = FolderBrowserDialog1.SelectedPath
    End Sub
 
 
 
    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
 
    End Sub
 
    Private Sub Button5_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        Label5.Visible = False
        Label6.Text = "Processing"
        ProgressBar1.Visible = True
        Label6.Visible = True
 
 
        'variable declarations
        Dim Data As String      'Reads line of data
        Dim Data2 As String     'in case data is on 2 lines
        Dim callNumber As String 'contains call number
        Dim category As String  'contains letter for category
        Dim pubYear As String   'contains year published
        Dim linkID As String    'used to make link
        Dim LINK As String      'contains link to article
        Dim title As String     'contains title
        Dim author As String    'contains name of author
        Dim switch As Integer   'used to control loop
        Dim Loc As Integer      'contains location of / in string
        '---------------------
        Button3.Visible = False
        Label6.Visible = True
        Label1.Visible = False
        FileOpen(1, strFilename, OpenMode.Input) 'open update file for input
        Data = LineInput(1)     'read blank line
        intCurrent = 1          'increment what line we are on
 
        Do While Not EOF(1) 'Start EOF Loop Here
            Data = LineInput(1)     'read callnumber and year published
            intCurrent = intCurrent + 1
            callNumber = Mid(Data, 2, 41)   'get call number
            callNumber = Trim(callNumber)   'clean up blank space
            category = Mid(callNumber, 1, 1)  'get category
            pubYear = Mid(Data, 43, 4)       'get published year
 
            Data = LineInput(1)     'read LinkID
            intCurrent = intCurrent + 1
            linkID = Trim(Data)     'get linkID
            LINK = "http://146.229.56.51/uhtbin/cgisirsi/x/0/0/5?user_id=GUEST&searchdata1=" + linkID
 
            Data = LineInput(1)     'read title/author
            intCurrent = intCurrent + 1
            switch = 0
 
            Label6.Text = "Processing."
 
            Do While switch = 0
                Data2 = LineInput(1)
                intCurrent = intCurrent + 1
                If Data2 = "" Then
                    switch = 1
                Else
                    Data = Data + Data2
                End If
            Loop
 
            Label6.Text = "Processing.."
 
            Loc = InStr(Data, "/")
            title = Mid(Data, 1, Loc - 1)
            title = Trim(title)
            author = Mid(Data, Loc + 1)
            author = Trim(author)
 
 
 
            getCat(category)    'gets filename from category
            FileCopy(outFilename, outFilename + "_working")
            FileOpen(2, outFilename + "_working", OpenMode.Input)
            Kill(outFilename)
            FileOpen(3, outFilename, OpenMode.Output)
 
            'loop to find where data goes
            Data = LineInput(2)
            Do While Not (Data = "/// Start")
                If Data = "/// Start" Then   'copy data until stop is found
                Else
                    PrintLine(3, Data)
                    Data = LineInput(2)
                End If
            Loop
            Label6.Text = "Processing..."
            PrintLine(3, "/// Start")
            PrintLine(3, "<item>")
            PrintLine(3, "<title>" + title + "</title>")
            PrintLine(3, "<link>" + LINK + "</link>")
            Print(3, "<description>" + "Author: " + author + vbNewLine + "Call Number: " + callNumber + vbNewLine + "Year Published: " + pubYear + "</description>" + vbNewLine)
            PrintLine(3, "</item>")
            Do While Not EOF(2)
                Data = LineInput(2)
                PrintLine(3, Data)
            Loop
            FileClose(2)
            Kill(outFilename + "_working")
            FileClose(3)
            ProgressBar1.Value = 100 / intLines * intCurrent
            Label6.Text = "Processing"
 
        Loop        'End EOF Loop Here
 
        Label6.Text = "Done"
 
    End Sub
 
 
End Class
 
Keywords: VB application locks up doing long proc…
Title
1 rss feeds in VB6
2 RSS feed
3 RSS Feed with password...
4 SQL DB into RSS Feed
5 I'm working to build an RSS Aggregat…
6 RSS Feeds
 
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[+][-]06.24.2008 at 02:18PM PDT, ID: 21860507

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[+][-]06.24.2008 at 03:07PM PDT, ID: 21860862

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[+][-]06.24.2008 at 03:25PM PDT, ID: 21861064

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About this solution

Zones: Visual Basic Programming, Windows Programming, .NET
Tags: VB.NET
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Solution Provided By: Idle_Mind
Participating Experts: 3
Solution Grade: A
 
 
[+][-]06.25.2008 at 06:21AM PDT, ID: 21865227

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[+][-]06.26.2008 at 07:45AM PDT, ID: 21875358

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