Re: picturebox databinding programatically - Visual Basic Discussion Boards

Dear all

I have got an academic project where, in the part 1 of the project, I need to read an usb device and get its PID, VID and other info. I need to do it in VB.Net.

Is there any procedure while working from Visual studio SDK, after surfing thru net for sometime I have learnt that there is one 'HID Class' which is supported only in Microsoft DDK .
Please help me regarding this matter. Confused | :confused:

Ok, I'm sure someone out here has a fix for this....

I have a project at work (in VB 2005) which has a couple mutually exclusive .dll's which are loaded at runtime. Occasionally, especialy when I switch which one gets compiled and included in the Debug, the symbols don't get loaded properly for the .dll, which means I am unable to debug anything inside it. Usually, I'm able to get it working without too much effort (though I'm never entirely sure what actually fixes it), but this time, nothing I do seems to fix it.

I have tried deleting the file from both the folder the .dll compiles in, and the the folder the scripting copies the folder to for runtime. I have tried Cleaniing the Solution. I have tried doing all the above and rebooting. I have checked the Debug settings: Debug is enabled, Optimizations are not. I have tried loading the .pdb manually, but VB says it doesn't match. And I have tried any number of other supposed fixes that haven't worked.

Does anybody else have any ideas on how to get the symbols to load so I can debug? This is getting very irritating, and so far has cost me a day of work for just this one incident.

Please help!

OK, so after trying pretty much everything under the sun, I gave up and decided to just put in a MsgBox where I wanted it to break. Not as useful as an actual Breakpoint, but at least I could check one of the things I was wanting to check.

So, I compiled and ran.

My MsgBox didn't appear. The application didn't get to the MsgBox line................
....................
....................
....................
...because it stopped at my Breakpoint.

WTF | :WTF:

Don't you just love Microsoft?

I amhaving problems with my db connection. In a form connected to the db through a table adaptor if i restore using CancelEdit, and then add new again the dataset retains the next sequential autonumber. i.e addnew id is 79, restore, addnew id is 80, when no 79 was actually created in the access db. I have tried restore etc to no avail. How can i reset the dataset to match the current autonumbers in the db. Thanks

First - why do you care what happened to ID 79 as long as the record was not saved.
Second - learn about ID fields, they should not have a use other than identifying the record. If your system is failing because there is no 79 you are using 79 for other than id. STOP.

This is a classic mistake all new programmers encounter.

Never underestimate the power of human stupidity
RAH

The reason i care :P is that when you try to delete the newly created record it uses the id as its Id into the back end (Db), there is no match so i get an error every time. so 79 in the dataset is actually say 77 in the Access db (Autonumber). In an ideal world this wouldn't happen however.. BTW yes i am new (trying to self teach) but am aware that an id is just that, a record placer.

I am trying to set a picturebox's image property to my database. The database column is called "Picture" and it is in binary format.
I am using this code for the textboxes:
textbox1.databindings.add("Text", BindingSource1, "FName")
Now this part works great but when I apply the same theory to the picturebox control, it will not bind.

Here is the picturebox control code for binding the binary data in the MS Access database:
picturebox.databindings.add("Image", BindingSource1, "Picture")

Could someone assist?

thanks,
jason

I'd rather have a bottle in front of me than a frontal lobotomy.

Hi Jason,

Please know that Images are stored in database as BLOB short for Binary Large OBject, a collection of binary data stored as a single entity in a database management systems (DBMS). BLOBs are used primarily to hold multimedia objects such as images, videos, and sound, though they can also be used to store programs or even fragments of code. Not all DBMSs support BLOBs.

Therefore, to read or write an image we need to use array of Byte. Below is a code snippet to read an image from a database and to show it on a picture box.

----------------------------------------------------------------------------------------------------
BEGIN CODE

' Construct a SQL string and a connection object
Dim sql As String = "SELECT UserPhoto FROM Users"
Dim conn As OleDbConnection = New OleDbConnection
conn.ConnectionString = connectionString
' Open connection
If conn.State <> ConnectionState.Open Then
conn.Open()
End If
Dim cmd As OleDbCommand = New OleDbCommand(sql, conn)
Dim fs As FileStream
Dim bw As BinaryWriter
Dim bufferSize As Integer = 300000
Dim outbyte(300000 - 1) As Byte
Dim retval As Long
Dim startIndex As Long = 0
Dim pub_id As String = ""
Dim reader As OleDbDataReader = cmd.ExecuteReader(CommandBehavior.SequentialAccess)
' Read first record
reader.Read()
fs = New FileStream(savedImageName, FileMode.OpenOrCreate, FileAccess.Write)
bw = New BinaryWriter(fs)
startIndex = 0
retval = reader.GetBytes(0, 0, outbyte, 0, bufferSize)
bw.Write(outbyte)
bw.Flush()
' Close the output file.
bw.Close()
fs.Close()
reader.Close()
' Display image
curImage = Image.FromFile(savedImageName)
PictureBox1.Image = curImage
PictureBox1.Invalidate()
' Clean up connection
If conn.State = ConnectionState.Open Then
conn.Close()
' Dispose connection
conn.Dispose()
End If
End Sub

END CODE
----------------------------------------------------------------------------------------------------

Hope this helps Smile | :)

.

Regards,
John Adams
ComponentOne LLC

Hi John-

Thanks for replying back. I have some questions about your code.

My connection setup is all done on the GUI side (using Dataset, bindingsource, and bindingnavigator). What I am doing is loading my data on startup of my app...my data loads fine (including the picbox) and the app is working great. What I was trying to do is create a checkbox on the form that, when checked, would parse the data out to display only the information in my new dataset, connectionstring, and query. And when unchecked, it would go back to its original state.

I got all that to work as well except for in the picbox. What I am doing is clearing all the databinding and then manually re-binding the data in the code. Everything updates when I do this except for the picbox.

Now to my question Smile | :)

I am using the code you provided and things needed modified but I am getting an error on "curImage". Can you elaborate on this part? I will provide your code again...you can then see the changes that were necessary to make (but may not be knowing that my connection setup is fine).

'Construct a SQL string and a connection object
Dim sql As String = "SELECT PK, FName, LName, CO, Street, City, State, Zip, Zip2, Email, SentDate, Sent, ReceivedDate, Received, Notes, Location, AddySource, Success, RTS, Fee, Preprint, Profession, TypedLetter, Picture, International, SentEmail FROM(ADDRESSES)WHERE(Success = 'Success')ORDER BY LName"
Dim conn As OleDb.OleDbConnection = New OleDb.OleDbConnection
conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Documents and Settings\jasons\Desktop\Autographs\bin\Autographs.mdb"
' Open connection
If conn.State <> ConnectionState.Open Then
conn.Open()
End If
Dim cmd As OleDb.OleDbCommand = New OleDb.OleDbCommand(sql, conn)

Dim fs As FileStream
Dim bw As BinaryWriter
Dim bufferSize As Integer = 300000
Dim outbyte(300000 - 1) As Byte
Dim retval As Long
Dim startIndex As Long = 0
Dim pub_id As String = ""
Dim reader As OleDb.OleDbDataReader = cmd.ExecuteReader(CommandBehavior.SequentialAccess)
' Read first record
reader.Read()
fs = New FileStream("Picture", FileMode.OpenOrCreate, FileAccess.Write)
bw = New BinaryWriter(fs)
startIndex = 0
retval = reader.GetBytes(0, 0, outbyte, 0, bufferSize)
bw.Write(outbyte)
bw.Flush()
' Close the output file.
bw.Close()
fs.Close()
reader.Close()
' Display image
curImage = Image.FromFile("Picture")
picImage.Image = curImage
picImage.Invalidate()

Thanks,
jason

I'd rather have a bottle in front of me than a frontal lobotomy.

Hi All,

i have set date format to dd/MM/yyyy in my application developed in vb.net. i don't know what will the system date format of my client'pc, so i want to set the date format of my client's pc according to my application's settings and restore its original settings when my application closed. all this i want at run time in vb.net.

thanks

Hi,

I would suggest you to try the following code snippet to change the date format of the system.
-----------------------------------------------------------------------------------------------
BEGIN CODE

Imports Microsoft.Win32

Dim reg As RegistryKey
reg = Registry.Users.OpenSubKey("S-1-5-21-1757981266-861567501-682003330-500\Control Panel\International", True)

If Convert.ToString(reg).Trim = String.Empty Then
MsgBox("Blank")
Else
reg.SetValue("sShortDate", "dd/MM/yyyy")
reg.SetValue("sLongDate", "dd/MM/yyyy")
End If

END CODE
-----------------------------------------------------------------------------------------------

Hope this helps Smile | :)

.

Regards,
John Adams
ComponentOne LLC

DON'T.

In your application, display the date in whatever format that you like, using ToString(formatstring), but _don't_ change the machine date time format.

I agree. Just change the display format, but not how the machine is set. Changing machine settings too much can be dangerous and probably piss off user.

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

hi every body

i want to change the start up form name according to the user choice he choose the form name from combo box and then suppose to save his choice in Application.myapp in the main form element , How Can i do that ???

Thanks
Mona

LA ELAH ELA ALLAH MOHAMED RASOL ALLAH

I have written a macro in XL VBA that at the touch of a button will copy two of the worksheets from a "Master" to a new worksheet, and then will save that worksheet by a unique name made from concatenation of several cells.

(it is a Purchase order, consists of Sitecode, Suppliercode and unique index number, these then form the name of the file, which is the Order Number, ie PUL-CAT01-001)

I know it is possible at this point to save the file to a SPECIFIC LOCATION, ie have the path set up so that it will save to a subdirectory based on the Site.

Damned if I can work out how to do this. I have spent quite some time looking around at various VBA sites, but alas seem incapable of locating anything like what I need.

Does anyone know of a site where I can be helped? or possibly suggest the line of code that needs to replace what is currently just a generic save into the top level directory?

I wouldn't ask, I would normally try to solve this, but time constraints and a certain ennui involved in looking at loads of VBA sites that help everything else but this have eroded my patience.

All and any help gratefully accepted!

------------------------------------
I try to appear cooler,
by calling him Euler.

AFAIK, the Workbook.SaveAs function takes a fully qualified path name argument.

hi,
i have search all about tcplistener, but many of the sample is about using console application, i am using windows application for vb.net want to create TCPListener server application, did anyone can tell about any reference of example in using TCPListener windows application.
please..

if you have vs2003 installed, you will find a sample app in the folder below,
"Program Files\Microsoft Visual Studio .NET 2003\Vb7\VB Samples"

else

send me your mail address and i will send you the app

thanks
Anoop

hai friends

i m using TableLayoutPanel control in my project to add the images and the corresponding indexes to it.

i can add to TableLayoutPanel control ...
the problem ...
it differs the direction ...
i.e
it is adding the images in the direction like this ..

<-------- / end of the Table Layout panel
2 1
i.e it is adding the images from the end of the TableLayoutPanel

plz help me ....
i need to add the images like this ------->

plz help

thanks in advance
vijay
devulapally_vijay@yahoo.co.in

Hello,

I am working in VB.NET (VS2005)

I need to disabled an item in CheckedListBox.
I know that I have to do as following: chk.items(No).enabled=false.
But in my case it is a little different:

Here is my code:

'In Form1
chk.Items.Add(New clsItem(ID1, Name1))
chk.Items.Add(New clsItem(ID2, Name2))
chk.Items.Add(New clsItem(ID3, Name3))

'Class
Public Class clsItem
Private ID As Integer, Name As String

Public Sub New(ByVal _ID As Integer, ByVal _Name As String)
ID = _ID
Name = _Name
End Sub

Public Overrides Function ToString() As String
Return Name
End Function

Property ItemID() As Integer
Get
Return ID
End Get
Set(ByVal value As Integer)
ID = value
End Set
End Property

Property ItemName() As String
Get
Return Name
End Get
Set(ByVal value As String)
Name = value
End Set
End Property
End Class

How can I disable one of my items now?

Thank you

Shay Noy

Hello,

Shay, if you need to disable only single item in the CheckedListBox, you can then try using
the ItemCheck() event of CheckedListBox. For example, in the given code snippet, I have disabled
the second item in the list.

<br />
Private Sub chk_ItemCheck(ByVal sender As Object, ByVal e As System.Windows.Forms.ItemCheckEventArgs) Handles chk.ItemCheck<br />
<br />
        If e.Index = 1 Then<br />
<br />
            e.NewValue = e.CurrentValue<br />
<br />
        End If<br />
<br />
End Sub<br />

You can manipulate it more, by taking a global variable which will hold the index of the row to be
disabled. You can match that variable value with the e.index to decide at runtime which rows to be
disabled.

I hope this will help you.

Regards,
Allen

Allen Smith

Software Engineer
ComponentOne LLC
www.componentone.com

Thank you, this is a good idea, I will use it.

Does anybody know how to solve it by really disabling the checkbox item as I ask in my first message?

Thank you

Shay Noy

Hi all!

I'm trying to do a pretty simple thing in VB6, but it's not working!

In the main form:

Sub Command1_Click()
    Dim cls1 As New Class1
    cls1.fnc1 StatusBar1.SimpleText
end sub

And in Class1:

Function fnc1(ByRef logText As String)
    Dim i as Integer
    For i=0 To 10
        logText = "We're at number " & i
    Next
End Function

I though this would update the statusbar text in real time, but it doesn't work!
Anyone knows why?

Because

Gadjuka wrote:
Dim cls1 As New Class1

creates a new Class1, which has no bearing on the instance of Class1 that is running.

Also, why on earth are you still using VB6 ?

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Well...some of our customers still have old VB6 applications. Sooner or later we'll upgrade them to .NET, but it takes time...

I tried the same thing in .NET by the way. There I get "A property or indexer may not be passed as an out or ref parameter", so this particular problem doesn't seems to be solved by upgrading.