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How to update listview ONLY when new data is avilable?

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  • May 5, 2007 at 2:11 am #187932
    method
    Member

    Hi all. I have seen many applications that listview ONLY updates when new data is avilable or when current data changes. I am making an application that deals with similer case. But i don’t know how these applications achive this task. I tried to use timer to refresh my listview every few seconds(I am loading data from dynamic xml to listview.)But there is a big problem that i keep losing focouse on the form and i see many unessary refreshes!! Could any one show me a better solution to avoid these unessry refreshes?I know these profitional applications are using a method that i am not aware of.Thanks

    May 5, 2007 at 2:20 am #187953
    Admin
    Administrator
    If rss  listview then
    
refresh
    
End If

    Tried that?

    May 5, 2007 at 2:32 am #187952
    method
    Member

    ghoast . Could you explain to me how to use that and how it works? I never seen it before :-(( . Acutally the dynamic data is not rss. It is just dynamic xml generated from remote mysql)

    May 5, 2007 at 3:14 am #187951
    Departure
    Member

    ghost wrote if rss is diffrent from listview then call the refresh function

    May 5, 2007 at 4:04 am #187950
    Admin
    Administrator

    Yep, exactly what Dep said…

    All it’s doing is comparing the XML with the listview and seeing if they’re the same. If they’re not, then, like Dep said, it calls the function to refresh. I just put “refresh” in there because I figured it’d be easier to understand 😛

    Hope you understand it now…

    May 5, 2007 at 4:21 am #187949
    method
    Member

    Thanks for both of you. ok. So how to compare rss with current listview? i posted my simple xml that is generated by php


    

    
artistname1
    
artistname1
    
image1.gif
    
2028574083
    
566
    
09898
    

    

    

    
artistname2
    
artistname2
    
image2.gif
    
2028574083
    
566
    
09898
    

    
...
    May 5, 2007 at 7:14 am #187948
    Admin
    Administrator

    What’s outputting to the listview? The whole XML file? Like, the artist, name, image, etc.? Or is it just the name of the song?

    May 5, 2007 at 11:56 am #187947
    method
    Member

    The whole xml file.

    May 5, 2007 at 12:17 pm #187946
    autopilot
    Member

    what I would do, is more like this

    If rss  rsscopy Then
    
rsscopy = rss
    
refreshlistview
    
End If
    May 5, 2007 at 3:06 pm #187945
    Admin
    Administrator

    @autopilot wrote:

    what I would do, is more like this

    If rss  rsscopy Then
    
rsscopy = rss
    
refreshlistview
    
End If

    That’s exactly what I was going to tell him to do next. Make a second, hidden listview and check it against the one displayed.

    May 6, 2007 at 1:13 pm #187944
    method
    Member

    @Ghost wrote:

    @autopilot wrote:

    what I would do, is more like this

    If rss  rsscopy Then
    
rsscopy = rss
    
refreshlistview
    
End If

    That’s exactly what I was going to tell him to do next. Make a second, hidden listview and check it against the one displayed.

    Thanks for your suggestion .So if i need make to make a new listview do you think this line :If rss rsscopy
    will do the compar? rss and rsscopy are listview names? If not . could any one show me how to compare them?

    May 7, 2007 at 12:47 am #187943
    Admin
    Administrator

    No, rss and rsscopy are what you’ve named the listviews. If you’ve named them rss and rsscopy, then yes, that’ll work. Otherwise, it’s whatever you’ve named them. Does that make sense?

    May 7, 2007 at 2:08 am #187942
    autopilot
    Member

    rss & rsscopy are the names of xml files… rss is the source xml and rsscopy would be a copy of rss… if those are the names of the xml files, then the if statement should work to compair the 2 xml files.

    autopilot

    May 7, 2007 at 3:00 am #187941
    Admin
    Administrator

    Oh, you’re doing it that way. I was thinking of loading the xml files into the program first… Autopiolt’s way would probably use less CPU, thus making it better. 😛

    May 8, 2007 at 12:54 am #187940
    method
    Member

    @Ghost wrote:

    Oh, you’re doing it that way. I was thinking of loading the xml files into the program first… Autopiolt’s way would probably use less CPU, thus making it better. 😛

    This is how i populate my listview. How to compare it with old listview data?I am totaly lost with your replies:-(

    Dim objDoc As MSXML2.DOMDocument
    Dim objNodelist As IXMLDOMNodeList
    Dim objNode As IXMLDOMNode
    Dim lvwItem As ListItem

    ‘load the xml document
    Set objDoc = New MSXML2.DOMDocument
    objDoc.async = False
    objDoc.Load “http://localhost/xmloutput.php”

    ‘add all the song nodes into a nodelist
    Set objNodelist = objDoc.selectNodes(“//song”)

    ‘Clear the listview
    ListView1.ListItems.Clear

    ‘Loop through each song node and add to the list view
    For Each objNode In objNodelist
    Set lvwItem = ListView1.ListItems.Add(, , objNode.selectSingleNode(“artist”).Text)
    lvwItem.SubItems(1) = objNode.selectSingleNode(“name”).Text
    lvwItem.SubItems(2) = objNode.selectSingleNode(“image”).Text
    lvwItem.SubItems(3) = objNode.selectSingleNode(“rating”).Text
    lvwItem.SubItems(4) = objNode.selectSingleNode(“songid”).Text
    lvwItem.SubItems(5) = objNode.selectSingleNode(“totalvotes”).Text

    Next objNode

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