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07.29.2008 at 04:11PM PDT, ID: 23605840
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8.0

How to refresh DDE links?

Asked by elmura in Microsoft Excel Spreadsheet Software, Microsoft Office Suite, Visual Basic Programming

Tags: , , , ,

A program I use to connect to feed data to Excel works via a DDE link. There are several DDE links within my spreadsheet that I need to update every second. The command lines of the dde link are arrays that define the parameters of the call to the external program.
What is the best way to refresh the data every second?
Currently, I have a method working that I'm not overly satisfied with. I run an OnTime macro to change one part of the array each second. This causes the link to update correctly but causes a the data on screen to disappear for a split second whilst the link is being changed and Excel has to make all the calculations that relate to this source data. Below is my working code.
When the data disappears, all my calcs go into error until the data reappears. I also have an XML feed into the same spreadsheet every 2 seconds. When both feeds are updated at the same time (every 2 seconds), the data errors for nearly one second!!! As you can see, I have added DoEvents & ScreenUpdating to try & improve this issue. Start Free Trial 
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Sub Update1()
    If runThem Then
    Application.ScreenUpdating = False
    Worksheets("Place Data").Range("A49:AJ242").Replace What:=",29", Replacement:=",30", LookAt:=xlPart, SearchOrder:=xlByRows
    DoEvents
    Set oddsFile = CreateObject("Scripting.FileSystemObject")
    oddsFile.CopyFile "C:\Program Files\Aus\Aus4\dds.txt", "C:\Program Files\Aus\Aus4\dds2.txt"    
    Worksheets("Place Data").Range("EB2").QueryTable.refresh BackgroundQuery:=False
    DoEvents
    Application.OnTime Now() + TimeSerial(0, 0, 1), "Update2"
    Application.ScreenUpdating = True
    End If
End Sub
Sub Update2()
    If runThem Then
    Application.ScreenUpdating = False
    Worksheets("Place Data").Range("A49:AJ242").Replace What:=",30", Replacement:=",29", LookAt:=xlPart, SearchOrder:=xlByRows
    DoEvents
    Set oddsFile = CreateObject("Scripting.FileSystemObject")
    oddsFile.CopyFile "C:\Program Files\Aus\Aus4\dds.txt", "C:\Program Files\Aus\Aus4\dds2.txt"
    Worksheets("Place Data").Range("EB2").QueryTable.refresh BackgroundQuery:=False
    DoEvents
    Application.OnTime Now() + TimeSerial(0, 0, 1), "Update1"
    Application.ScreenUpdating = True
End If
End Sub
[+][-]07.30.2008 at 10:25AM PDT, ID: 22122640

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[+][-]08.05.2008 at 12:11PM PDT, ID: 22164035

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About this solution

Zones: Microsoft Excel Spreadsheet Software, Microsoft Office Suite, Visual Basic Programming
Tags: Microsoft, Excel, 2002, VBA, VBA
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Solution Provided By: mwolfe02
Participating Experts: 2
Solution Grade: A
 
 
[+][-]09.20.2008 at 01:06AM PDT, ID: 22528771

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[+][-]09.25.2008 at 08:28PM PDT, ID: 22576398

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