Visual Basic

16-Jun-10 1:57

If the image came from a database, either you database stored the path and you haven't retrieved it, or it stored the image itself, in which case, there is no path since it's not stored as a file anywhere.

If you built the dataset yourself from image files, you just need to add the path to the file you used to another column in the dataset.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

bluetooth application

Folad System16-Jun-10 0:48

Folad System

16-Jun-10 0:48

Any one out there should help me.
My project is on bluetooth communication. So i want to write a VB.net application that can communicate with the a mobile phone through bluetooth.

Johnny J.16-Jun-10 0:51

Johnny J.

16-Jun-10 0:51

Yes, anyone should definitely help you...

Dave Kreskowiak16-Jun-10 1:54

16-Jun-10 1:54

... and?

You haven't asked a question, so how is anyone supposed to help you??

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

Richard MacCutchan16-Jun-10 1:56

Richard MacCutchan

16-Jun-10 1:56

Try searching Google for "Bluetooth VB.NET", I expect there are lots of samples out there.

It's time for a new signature.

AlmightyEdge16-Jun-10 10:34

AlmightyEdge

16-Jun-10 10:34

Start here: http://msdn.microsoft.com/en-us/library/aa362932%28VS.85%29.aspx

Using event in vbnet

thesum15-Jun-10 23:39

thesum

15-Jun-10 23:39

Hi,

I am using a scanner , that scaner raise an event when scanning a data .
I have got a function listening this event and when the event is raised, it launch a form.

<br />
private sub INIT()<br />
addhandler scandone, addressof afficherForm<br />
end sub<br />
<br />
<br />
<br />
Private sub scan ()<br />
raiseEvent ScanDone<br />
end sub<br />
<br />
<br />
Private sub AfficherForm() <br />
Dim myform as new form<br />
myform.showdialog<br />
end sub<br />

the problem is, i can't scan anymore when my event is raised and while ma new form is running, i have to exit the "new thread" to be able to scan again.
How can i resolve this problem please ?

thanks

Dave Kreskowiak16-Jun-10 1:54

16-Jun-10 1:54

There's not enough here to determine what your actually doing with these pieces of code (like the form you launched), but the most obvious reason why would be that ShowDialog is a blocking call. No other code will execute until that dialog is dismissed. If this is not what you want, change the ShowDialog to Show. Show does not block. The code after it will continue to execute with the new form still showing.

As a side, whenever you show a form with ShowDialog, you are also responsible for calling Dispose on it when you're done with it. Your code doesn't do that anywhere and will leak resources if it's not fixed.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

thesum16-Jun-10 2:18

thesum

16-Jun-10 2:18

For some other reason i have to use the ShowDialog mode.
But i guess it is possible to launch the new form not in the thread that launch the event but from the one of the main form.
It blocks because the form is launched from the scanner thread so the scanner is bloqued.
How can i resolve this ?

Dave Kreskowiak16-Jun-10 8:42

16-Jun-10 8:42

The scanner is using a background thread internally. The library is raising the events on the UI (start up) thread. It may be possible to move the scanner component to a background thread also, but you may also run into problems with that. The people who can answer that question are the people who made the scanner and its SDK.

thesum wrote:
But i guess it is possible to launch the new form not in the thread that launch the event but from the one of the main form.

You cannot launch forms on anything other that the startup thread. SO, you have another problem. You cannot launch a new form for every scanned page while the first one is still active. You cannot show form after form after form from that event handler because ShowDialog will block and prevent the handler from executing again until the dialog is dismissed. You simply have not choices here. You have to change the design of your app, specifically, change the ShowDialog to Show.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

thesum16-Jun-10 20:48

thesum

16-Jun-10 20:48

Yes i understand, but i would like to launch the form from the starup thread and before making my showdilog i would make a removeHandler for my scanner Event.
One solution is to create a timer.
Enable the timer when the scan is done, and in the Time_Tick event, launch my new form (and removeHandler of my scanner).
There are no other way to do this method by other way than using a Timer ?

Dave Kreskowiak17-Jun-10 1:32

i want to convert StrPtr to vb.net

17-Jun-10 1:32

thesum wrote:
Enable the timer when the scan is done, and in the Time_Tick event, launch my new form

So you're trying to launch the new form on a seperate thread? Not going to work and is pointless.

The whole point behind a ShowDialog call is to stop execution of the code until the dialog is dismissed. Why are you saying that you need to use ShowDialog, but yet not block the code?

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

Pdf Reader

sarathy5615-Jun-10 23:04

sarathy56

15-Jun-10 23:04

How to read the contents of a PDF in VB.Net

Re: Pdf Reader

Scubapro16-Jun-10 0:54

Scubapro

16-Jun-10 0:54

You can use for instance ItextSharp.dll.
Take a look at this:

http://www.codeproject.com/KB/files/PDF_to_TEXT.aspx

buffering8315-Jun-10 22:19

buffering83

15-Jun-10 22:19

I am using visual studio 2005, 2008.

And now i am converting visual basic6.0 to vb.net.

Strptr function don't be convertet.

So how can i convert?

below is source.

Public Function AToW(ByVal st As String)
Dim pwz As Integer
pwz = StrPtr(st)

hi

My english is a little.
anyway, nice to meet you~~
and give me your advice anytime~

Re: i want to convert StrPtr to vb.net

DaveAuld15-Jun-10 22:29

DaveAuld

15-Jun-10 22:29

Google not working this morning?

http://social.msdn.microsoft.com/forums/en-US/vbgeneral/thread/410cd02e-84fa-462f-90f5-d09962e8c749[^]

Dave

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Inserted row in unbound datagridview

C#Coudou15-Jun-10 13:54

C#Coudou

15-Jun-10 13:54

Hi mates,

I have an unbound datagridview which has bound combobox and an insert button for inserting new row.
The problem is when I input data in row 1 it will move to row 3
after hitting enter key.

Example.

--------------------------------------
     column1 |  column2(boundcombox)
--------------------------------------
row1         |                          ----> inserted row
--------------------------------------
row2         |                          ----> inserted row 
--------------------------------------
row3    test |         112              ---->original row
--------------------------------------

Note: I have an event that will automatically
fill the data in column2, when input in column1.

C# コードMicrosoft End User
2000-2008

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The best things in life are free
」」」」」」」」」」」」」」」」」」」」」」」」」」」」

Wayne Gaylard15-Jun-10 15:41

Wayne Gaylard

15-Jun-10 15:41

Can you show us the code you used to insert the row?

C#Coudou15-Jun-10 15:55

C#Coudou

15-Jun-10 15:55

Heres the code for inserting a new row, it will insert in the middle of two rows, it just NOT insert at the last. it will insert any row you want.
then recount the sequence no.

Private Sub btnInsRow_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnInsRow.Click

       Dim posRow, seq As Integer
       Dim iRow As Integer
       Dim dRow As DataRow = dttable.NewRow

       Try

           If Me.C1tdbgridAnalyze.RowCount <> 0 Then

               If Me.C1tdbgridAnalyze.Item(Me.C1tdbgridAnalyze.Row, 4) < 96 Then

                   With Me.C1tdbgridAnalyze
                       dRow("OrderNo") = .Item(.Row, 0)
                       dRow("ItemNo") = .Item(.Row, 1)

              If .Row = 0 Then
                           posRow = .Row
                           dRow("SeqNo") = .Item(.Row, 4)
                           seq = dRow("SeqNo")
                       Else
                           posRow = .Row + 1
                           dRow("SeqNo") = .Item(.Row, 4) + 1
                           seq = dRow("SeqNo")
                       End If
                       dttable.Rows.InsertAt(dRow, posRow)
                       .Row = posRow
                       .DirectionAfterEnter = C1.Win.C1TrueDBGrid.DirectionAfterEnterEnum.MoveDown
                       .Col = 0
                       .Select()

                       iRow = seq
                       For seqRow As Integer = 0 To .RowCount
                           If seqRow >= posRow Then
                               If .Item(seqRow, 4) <> Nothing Then
                                   .Item(seqRow, 4) = iRow
                               End If
                               iRow += 1
                           End If
                       Next
                   End With
               End If
           End If
       Catch ex As Exception
           log.Debug(ex.ToString)
           Throw ex
       End Try
   End Sub

DaveAuld15-Jun-10 22:15

DaveAuld

15-Jun-10 22:15

C#Coudou wrote:
Me.C1tdbgridAnalyze.RowCount <> 0

I would personally not check for 0 rows, but test for less than or equal to 0 ie <=0

C#Coudou wrote:
For seqRow As Integer = 0 To .RowCount

Will .RowCount not exceed the bounds for a 0 based collection, should it not be .RowCount - 1

You are more than just interacting with a unbound datagrid here, should you not first start with the insert operation and then update the other controls. e.g. dttable, c1tbdgridAnalyze

C#Coudou wrote:
posRow = .Row + 1

You then try to insert at position posRow, this is outwith the bounds of the rows collection as this position does not ~~insert~~ exist, if you are on the last row, do you not need to use an AddRow method (not sure exactly which type of control you are using. are you using a standard System.Windows.Forms.DataGridView?

A standard DGV has both an Rows.Add() and a Rows.Insert(position) method for working with the rows collection.

Dave

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