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When the program copy files, the text box Total_Percentage_Done is not being updated

Posted on 2003-11-25
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When the program copy files, the text box Total_Percentage_Done is not being updated
It copied all of the files from one directory into another, but the text box showing
percentage completed never got updated.

This line with a  99 mark can be found below
 99     Total_Percentage_Done.Text = Total_Percentage_Completed   <-- Problem
======================================================

Option Explicit

'These are public variables and constant within this form and therefore,
'its value can be accessed by any function and procedure eithin this form
Const Source_File_Path_1 = "C:\WINNT\SYSTEM32\"      '"A:\WebOffice_VPN\"
Const Source_File_Path_2 = "C:\WINNT\SYSTEM32\"      '"A:\WebOffice_VPN\OCX\"

Dim Boot_Up_Drive_Letter As String                   'C:\
Dim Boot_Up_Drive_Letter_And_Directory As String     'C:\winnt\system32\'

/////////////////////////////////////////////////////////////////////////////

Private Sub Form_Load()
  ProgressBar1.Max = 5
  ProgressBar1.Visible = True
 
  'If ProgressBar1.Max =  5, then it will take 5 seconds to fill the Progress Bar
  'If ProgressBar1.Max = 10, then it will take 10 seconds to fill the Progress Bar
  'If ProgressBar1.Max = 20, then it will take 20 seconds to fill the Progress Bar

  Timer1.Interval = 1000
  Timer1.Enabled = True
End Sub

/////////////////////////////////////////////////////////////////////////////

Private Sub timer1_Timer()
  Static integer_Time
 
  If IsEmpty(integer_Time) Then
    integer_Time = 1
    Time_Text_Box = integer_Time
  End If
 
  ProgressBar1.Value = integer_Time
 
  If integer_Time = ProgressBar1.Max Then
    Timer1.Enabled = False
    ProgressBar1.Visible = False
    integer_Time = 1
    Time_Text_Box = integer_Time
    ProgressBar1.Value = ProgressBar1.Min
    Call Compute_Total_Files_Size
  Else
    integer_Time = integer_Time + 1
    Time_Text_Box = integer_Time
  End If
End Sub

/////////////////////////////////////////////////////////////////////////////

Private Sub Compute_Total_Files_Size()

    Dim File_Size As Double
    Dim Folder_Size As Double
    Dim Percent_Of_Total As Double
    Dim Total_Percentage_Completed As Double
    Dim Error_Exist As Boolean
   
    'Declare File System Variables
    Dim object_File As Scripting.File
    Dim object_FileSystem As Scripting.FileSystemObject
    Dim object_Folder As Scripting.Folder

    'Source_File_Path_1 = "A:\WebOffice_VPN\"
    'Source_File_Path_2 = "A:\WebOffice_VPN\OCX\"

    Set object_FileSystem = New Scripting.FileSystemObject
    Set object_Folder = object_FileSystem.GetFolder(Source_File_Path_1)

    Error_Exist = False
    Folder_Size = object_Folder.Size
    Total_Percentage_Completed = 0

    Form_Copy_Status.Show

    For Each object_File In object_Folder.Files
      Form_Copy_Status.Copy_From = Source_File_Path_1        'A:\WebOffice_VPN\
      Form_Copy_Status.Copy_To = Form1.Directory_Box          'C:\WebOffice_VPN\
      object_FileSystem.CopyFile Source_File_Path_1 & _
                                                object_File.Name, "C:\WebOffice_VPN\"

      Percent_Of_Total = Val(Format((object_File.Size / Folder_Size) * 100, "0.00"))
      Total_Percentage_Completed = Total_Percentage_Completed + Percent_Of_Total
 99     Total_Percentage_Done.Text = Total_Percentage_Completed   <-- Problem
      Debug.Print " File Name = "; object_File.Name; "  File Size = ";  _
                           object_File.Size; "Percent_Of_Total = "; Percent_Of_Total
    Next object_File
   
End Sub
0
Comment
Question by:lin100
  • 2
3 Comments
 
LVL 28

Expert Comment

by:vinnyd79
ID: 9820376
Try adding a DoEvents before your Next line:

DoEvents
Next object_File
0
 

Author Comment

by:lin100
ID: 9821255
Hi  vinnyd79. Thank you very much for your answer. Please explain why I need
DoEvents in order for it to work ?

Under what condition would I used DoEvents ?

You got an A. Please respond to my question
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LVL 28

Accepted Solution

by:
vinnyd79 earned 200 total points
ID: 9821378
DoEvents passes control to the OS so it can process messages in its queue.I usually put one in a loop such as For/Next, Do/Until,While/Wend to allow things to update,such as a Label or a Progress Bar.


http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbenlr98/html/vafctdoevents.asp
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