[RESOLVED] Received error when I click button

I need your help, I am trying to get over this problem and I don't know why I get an error message everytime when I click the button.



Here it the code:

Code:

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Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim da As New System.Data.OleDb.OleDbDataAdapter("Select * From Table1", "Put an actual connection string here.  THIS SHOULD NOT BE COPIED MINDLESSLY AND EXPECTED TO WORK")
        Dim dt As New DataTable
        da.Fill(dt)

        Dim img As Image

        For Each row As DataRow In dt.Rows
            img = Image.FromStream(New IO.MemoryStream(DirectCast(row.Item("NameOfImageColumn").Value, Byte())))
            'Do something with the image
        Next
End Sub

---

Error: Format of the initialization string does not conform to specification starting at index 0.



It shows highlight on Dim da As New System.Data.OleDb.OleDbDataAdapter("Select * From Table1", "Put an actual connection string here. THIS SHOULD NOT BE COPIED MINDLESSLY AND EXPECTED TO WORK") as statement. What can I do to get this fix??



Thanks,
Mark

You are kidding me, right? Did you actually read that code? Look at the second argument you're passing to your OleDbDataAdapter constructor:

Quote:

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Put an actual connection string here. THIS SHOULD NOT BE COPIED MINDLESSLY AND EXPECTED TO WORK

---

Despite the fact that that explicitly tells you to put an actual connection string there, you seem to have mindlessly copied it and expected it to work.

Thanks for your reply JMC. I am not really kidding to you, what shall I do with that second argument you have shown on your post??



Shall I input the name of the columns from my database??




Thanks,
Mark

No, you shall do what it specifically tells you to do:

Quote:

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Put an actual connection string here.

---

You can get the connection string format for your data source at www.connectionstrings.com. Note that it will give you the format only. It's still up to you to put the correct parameter values into it.

Ok thanks, I am using microsoft access 2007 so why did you post the link to find out the connection string format for my data source?? It won't tell me on that site where I have take a look so hope we can get this resolve if you please tell me an instructions what I do with??


The link you post gave me no where to go.


Thanks,
Mark

Code:

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Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\myFolder\myAccess2007file.accdb;Persist Security Info=False;

---

Is that connection string format for my data source where I should replace Put an actual connection string here. on my statement??



Thanks,
Mark

Quote:

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Originally Posted by Mark107

Code:

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Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\myFolder\myAccess2007file.accdb;Persist Security Info=False;

---

Is that connection string format for my data source where I should replace Put an actual connection string here. on my statement??



Thanks,
Mark

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Did you try it? Did it work? If it did then the answer is "yes", otherwise the answer is "no".

LOL, i'm the one who gave him the original code. I thought i'd made it pretty clear that it shouldn't be copied and pasted, but oh well.

Anyway, Mark, how about you answer a few questions instead:

Is this a multi-user program?

If your answer was YES, then is the database file being stored on a network PC?

If your answer was NO, then we will assume that it will be located in Application.StartupPath, and probably without any kind of security, in which case, you could try this:

Code:

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Dim da As New System.Data.OleDb.OleDbDataAdapter("Select * From Table1", "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" & Application.StartupPath & "\myAccess2007file.accdb;Persist Security Info=False;")

---

Yes I did and it's nearly fix but there is another error message, The 'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine.



It show the yellow highlight on da.Fill(dt) statement. I don't see what's the problem is??


Thanks,
Mark

Quote:

---

Originally Posted by Mark107

Yes I did and it's nearly fix but there is another error message, The 'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine.



It show the yellow highlight on da.Fill(dt) statement. I don't see what's the problem is??


Thanks,
Mark

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Do you have Access 2007 installed on your machine? If not then you will have to install the Office 2007 driver pack, downloadable from Microsoft, to install the Access 2007 OLEDB provider.

I only have microsoft access 2002 on my machine. Can you post a link on here because i took a look on google and none of them have found??




Thanks,
Mark

Quote:

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Originally Posted by jmcilhinney

Do you have Access 2007 installed on your machine? If not then you will have to install the Office 2007 driver pack, downloadable from Microsoft, to install the Access 2007 OLEDB provider.

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I have rename from Provider=Microsoft.ACE.OLEDB.12.0;Data Source= to Provider=Microsoft.Jet.OLEDB.4.0;Data source= so when I run the form and when I click the button, it highlighting on da.Fill(dt) as statement with the error OleDBExpection was unhandled Not a valid file name.


It do not means I am using old version but something is incorrect and need to fix??


Thanks,
Mark

Hi Mark,

The database which you want to connect to, is Access 2007. Your local computer only has the neccessary files to talk to Access versions upto and including 2003. Therefore, in order for your local machine and indeed your code, to communicate with your database, you will need to install or upgrade the office libraries/certain Office files upon your computer.

One way of doing this would be to upgrade your local copy of Office 2002 to an Office 2007 version, another way would be to install Office 2007 onto your computer alongside your existing Office 2002 version and the third and perhaps easiest option would be to install the Office 2007 driver pack which has already been suggested above.

As for your connection string and related to your last question/post there, I would suggest you research what a connection string is to begin with. First off, this is direct from MS:

Quote:

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A connection string is a string version of the initialization properties needed to connect to a data store and enables you to easily store connection information within your application or to pass it between applications. Without a connection string, you would be required to store or pass a complex array of structures to access data.

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Basically, to make a connection to a database, several items of information are required to be known. The first is the type of the database, the second is the location of the database, then you may have valid login or authorisation information for this specific database . These are the basic items of information required before VB will make the database connection. A connection string is a ";" delimited string representation of these items of information.

Once you grasp this part, the connectionstrings site, and indeed the individual ; separated parts of the connectionstring examples shown upon that site should fall slowly into place. To further explain your last post, the provider connectionstring specifier details the type of database you are wanting to connect to. Using the following, once you've set your machine up to talk to Office 2007 applications, will allow you to connect specifically to an Office 2007 Access database:

Code:

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Provider=Microsoft.ACE.OLEDB.12.0;

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Next up, the Data Source specifier details the location of your database, so you need to add this in after your equals sign, like this:

Code:

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Data Source=C:\myFolder\myAccess2007file.accdb

---

It looks as though the connection string in your post 6 may well work if that database location is right and you have your machine setup to communicate with Office 2007 applications properly.

Thanks for your alex_read, unfornately there is no package for win 2000 where I am using on. However I find other useful code which let me reading information from the database.

Code:

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Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim da As New System.Data.OleDb.OleDbDataAdapter("Select * From Table1", "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Application.StartupPath & "\db1_test.mdb;Persist Security Info=False;")
        Dim dt As New DataTable
        da.Fill(dt)

        Dim img As Image

        For Each row As DataRow In dt.Rows
            img = Image.FromStream(New IO.MemoryStream(DirectCast(row.Item("Images").Value, Byte())))
            'Do something with the image
        Next

End Sub

---

When I run the form and when I click the button, I have an error message saying Public member 'Value' on type 'Byte()' not found. It show the highlight on img = Image.FromStream(New IO.MemoryStream(DirectCast(row.Item("Images").Value, Byte()))) as statement.


Please can you help to get this fix??





Thanks,
Mark

Are you developing the app on what system and office verison? Is the db located on a different 2k system?

The office version is 2003 and the os is win 2000 so I prefer to use Microsoft.Jet.OLEDB.4.0;Data Source which it will works. However, when I run the form and when I click the button, I have an error message saying Public member 'Value' on type 'Byte()' not found. It show the highlight on img = Image.FromStream(New IO.MemoryStream(DirectCast(row.Item("Images").Value, Byte()))) as statement.


Please can you help to get this fix??





Thanks,
Mark

Now I'm confused as above you put "Ok thanks, I am using microsoft access 2007" :eek: :confused: :confused:

ANyhow with your last point there, could your datatable possibly contain NULL values / is it possible one of your rows does not have an entry in the images column at all?

Are you using a *.accdb Access database file or an *.mdb Access database file?

Sorry I typed by my mistake. I should have input "Ok thanks, I am using microsoft access 2002" in the first place. Anyway, I believe they could work in both ways and I think the rows do have entry in the images column but the images do not shown on my listview.



Hope there is a way to get it resolve.


Thanks,
Mark

Quote:

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Originally Posted by alex_read

Now I'm confused as above you put "Ok thanks, I am using microsoft access 2007" :eek: :confused: :confused:

ANyhow with your last point there, could your datatable possibly contain NULL values / is it possible one of your rows does not have an entry in the images column at all?

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I am using .mdb access database file.

Quote:

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Originally Posted by RobDog888

Are you using a *.accdb Access database file or an *.mdb Access database file?

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Ok then the connectionstring shouldnt be the issue here. The line of code ...

Code:

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img = Image.FromStream(New IO.MemoryStream(DirectCast(row.Item("Images").Value, Byte())))

---

Is where you are generating your error so that shold be looked at for correcting.

So do you have "row.Item("Images").Value" actually show up in the intellisense? Is that the correct type to be casting the image data to?

Then the Jet.OleDB.4.0 is the right connection provider to use definitely.

Can you try with this code please? Does this get rid of that error?

Code:

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For Each row As DataRow In dt.Rows
    If not (row.Item("Images") is nothing) then
        img = Image.FromStream(New IO.MemoryStream(DirectCast(row.Item("Images").Value, Byte())))
        'Do something with the image
    End If
Next

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It is still the same error I have got, it pointing on img = Image.FromStream(New IO.MemoryStream(DirectCast(row.Item("Images").Value, Byte()))) said that MissingMemberExpection was Unhandled Public member 'Value' on type 'Byte()' not found.




I have already input the name of the column which it is Images into my database.



Something is not right that going into the same way round??



Thanks,
Mark

I had this thread open way too long in a browser window so didn't see Rob's reply there. Ignore my post and follow his suggestion. The removal of .Value should sort your issue here.

I think this should work

Code:

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img = Image.FromStream(New IO.MemoryStream(DirectCast(row.Item("Images"), Byte())))

---

I only tested it for valid syntax but didnt mock up a populated dt.

Thanks for your advise, I have take a test with my form and when I click the button, there is no images and text data to displaying on my listview.



http://img176.imageshack.us/img176/4246/imageuf1.jpg




There is nothing on my listview as it is blank. What's going on, something is not right?? :confused:



Thanks,
Mark

Step through your code to make sure you are returning records.

Code:

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Public Class Form1

    Dim xConn As sqlConn
    Public Shared item1 As New ListViewItem()

    Private Const LVM_FIRST As Long = &H1000
    Private Const LVM_SETEXTENDEDLISTVIEWSTYLE As Long = (LVM_FIRST + 54)
    Private Const LVS_EX_FLATSB As Long = &H100

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim da As New System.Data.OleDb.OleDbDataAdapter("Select * From Table1", "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Application.StartupPath & "\db1_test.mdb;Persist Security Info=False;")
        Dim dt As New DataTable
        da.Fill(dt)

        Dim img As Image

        For Each row As DataRow In dt.Rows
            img = Image.FromStream(New IO.MemoryStream(DirectCast(row.Item("Images").Value, Byte())))
            'Do something with the image
        Next
    End Sub
End Class

---

Code:

---

Public Class sqlConn

    Friend WithEvents OLEConn As New System.Data.OleDb.OleDbConnection()
    Friend WithEvents OLEComm As New System.Data.OleDb.OleDbCommand()

    Private sqlString As String
    Private err As System.Exception

    Public Shared dataReturned As New ArrayList()

    Public Property db() As String
        Get
            db = "C:\\db1_test.mdb"
        End Get
        Set(ByVal Value As String)
            Value = db
        End Set
    End Property

    Public Property xOLE() As String
        Get
            xOLE = "Provider=Microsoft.Jet.OLEDB.4.0;Data source="
        End Get
        Set(ByVal Value As String)
            Value = xOLE
        End Set
    End Property

    Function connectMe(ByVal sqlString As String) As Boolean
        Try
            OLEConn.ConnectionString = xOLE & db
            OLEConn.Open()
            OLEComm.CommandText = sqlString
            Return True
        Catch err As System.Exception
            MsgBox(err.Message)
            Return False
        End Try
    End Function

    Function getData() As ArrayList

        OLEComm.Connection = OLEConn

        getData = New ArrayList()

        Dim d As OleDb.OleDbDataReader = OLEComm.ExecuteReader()
        Do While d.Read
            getData.Add(d("Images".ToString))
            getData.Add(d("Cars".ToString))
        Loop

        'Returns array collection
        dataReturned = getData
    End Function
End Class

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do you know what the problem is and how to fix it??




Thanks,
Mark

Your sqlConn class is terrible. Do some research on Properties and how they should be coded. Just so you know, Get should return the variable, Set should assign it a value.

Here is how your db property should look. (You are currently hard coding in a value so the set will never change it)

Code:

---

Private m_db As String

Public Property db() As String
    Get
        Return m_db
    End Get
    Set(ByVal value As String)
        m_db = value
    End Set
End Property

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Thanks for your input RobDog, I have replaced the code you post on here but it is still the same where it was, no image to display on my listview.



I don't know what I should do now, maybe I should post attachment then??


Thanks,
Mark

The property code was just an extra fix that may have helped with changing your connection to the db but ...

If you want to attach your solution and database in zip format I'm sure it would be easier to test out your situation. Ps, remove the debug and Release folders to help reduce the size.

There you go! Hope you can be able to situations and get the problem fixed asap!





Thanks,
Mark

do anyone know how to fix this????????????????

That's because you're never calling any code to output your database values to your listbox, all you have is a comment similar to "do something with the values here".

This code will work providing you change where I have put "C:\Path" to the actual directory location your database is found within. Also don't use double \\ characters for this path. That is not needed.

Code:

---

    Private Sub Button1_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles Button1.Click
        ' Connect to the database and retreive the data required from Table1 into a datatable object.
        Dim da As New System.Data.OleDb.OleDbDataAdapter( _
            "SELECT Car, Images FROM Table1 ORDER BY Car DESC", _
            "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Path\db1_test.mdb;Persist Security Info=False;")
        Dim dt As New DataTable
        da.Fill(dt)

        ' Place a new imagelist control onto your form designer window. The following
        ' will assign the listview to read from this control.
        With listview1
            .LargeImageList = imagelist1     
            .SmallImageList = imagelist1
        End With

        Dim img As Image
        Dim intImageIndex as Integer = 0

        ' Loop through each row in the database.
        For Each row As DataRow In dt.Rows
            ' First off, check we have a record value within the Car column.
            If not string.IsNullOrEmpty(row.Item("Car")) Then

                ' If there is an image contained within the row, retreive this into a new image object.
                ' Next, add this image into the imagelist control & output the car name and image to the
                ' listview as a newlist item. This last call references the image by index number, which
                ' is kept track of in the intImageIndex variable - incremented upon each loop iteration.
                If Not(row.Item("Images") is nothing) then
                    img = Image.FromStream(New IO.MemoryStream(DirectCast(row.Item("Images"), Byte())))
                    imagelist1.Images.Add(row.Item("Car").ToString, img)
                    listview1.Items.Add(row.Item("Car").ToString, intImageIndex)
                Else
                    ' If we arrived at this point, we have a car record entry, but no image. Therefore
                    ' we will just output the info we do have into a new listview listitem.
                    listview1.Items.Add(row.Item("Car").ToString)
                End If
            Else
                ' If we arrived here at this point in the code, then no record beneath the Car column
                ' exists for the row. Here we check if there's an image record and output that if
                ' existing in the same manner as above.
                If Not(row.Item("Images") is nothing) then
                    img = Image.FromStream(New IO.MemoryStream(DirectCast(row.Item("Images"), Byte())))
                    imagelist1.Images.Add("{NULL Value}", img)
                    listview1.Items.Add("{NULL Value}", intImageIndex)
                End If
            End If

            intImageIndex +=1
        Next

        If Me.ListView1.Items.Count >= 12 Then
            Me.VScrollBar1.Enabled = True
            ListView1.Scrollable = True ' I've altered this, I believe you want true here.
            VScrollBar1.Maximum = ListView1.Items.Count
        End If
    End Sub

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same thread?

CodeGuru

Thanks for your help alex_read, you have been awesome. We have finally found the situations to get it sorting so now it's resolve ;)



Thanks for the help, keep up the good work! :thumb:



Thanks,
Mark