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d_smita wrote: dim clientSck as TcpClient
clientSck.connect(ipaddress,portno)
here if server application is not running it raised the exception,
Wrap this in a Try/Catch block to get the exception and handle the problem however you want.
Try
clientSck.Connect(ipaddress.portno)
Catch ex As SocketException
' The Connect call threw an exception
' Do whatever you need to do to handle the situation
End Try
The TcpClient class already exposes a Connected property. It's true if a connection was successful, otherwise false.
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can i protect my files by applying the password using the vb.net.i mean can i apply some restrictions.I want to start fom the scratch.what should I do?
-- modified at 6:37 Friday 25th May, 2007
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Nilish wrote: can i protect my files by applying the password
If you were talking about password protecting any file, not just your own application, then no, you cannot do this. This requires writing a low-level file system extension to support this, writing a database manager to hold all of the passwords, writing a utility to manage the password database, and finally, comming up with a method to recover a file if the user ever forgets the password (like that ever happens!  )
This requires a blackbelt in Windows internals and NTFS. No, there is no guide to walk you through something like this.
If you were talking about protecting the data files of your own application, then you'd have to code this into your app. You could encrypt the file with the password making it look like a pile of junk if opened in something like Notepad. This will NOT stop any other application from opening the file! It just encrypts the data in it!
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Hi,
I want to commands in vb.net to backup my Mysql Database.
Can anyone please help me?
Thanks in advance.
bye.
Thanks & Regards
Gita
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gitasnr wrote: I want to commands in vb.net to backup my Mysql Database.
Can anyone please help me?
VB.NET does not do this. MySql does this. Send the command to MySql through the appropriate data provider's command object. (I'm guessing you've got a MySqlCommand object from somewhere).
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Thanks,
but i know this mysql does this. but i m not getting the mysql command to take backup & restore it. I will try to execute those commands in vb.net.
If u know the mysql commands for backup & restore plz tell me.
thanks
bye.
Thanks & Regards
Gita
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Dave Kreskowiak wrote: It's absolutely amazing what you find with a little help from Google.
That's just shocking! What are they doing indexing that kind of thing?! 
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I swear, lately, about 80% of the questions that show up can be answered by a single Google.
I especially love the ones that start with "Where can I find...". Hey! Maybe we could add some code behind the forum Submit button to automatically put the posters question into Google and return a search page, without posting the question to CP!
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User wrote: Help me ! Urgent.
Just checked, even this question will return answers related to programming, in fact amazingly many.
SAP support actually already uses the technique your suggesting to filter out all the
User wrote: Help me ! Urgent. Someone stole my Any key!
messages. Except that they make users go through posted articles before they can log a question.
You might actually be on to something.
My advice is free, and you may get what you paid for.
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I was trying the command line arguments to get the path of the selected folder programatically in vb.net.
It is working fine except one thing
if the folder name is like c:\abc def
then i am getting c:\abc
if the folder name is c:\abc
then the output is correct.
in command line argument
i am using
application path %1
eg
c:\abc.exe %1
Please help
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If the path contains spaces then put it in quotes in the command line.
MyApplication "c:\My Path With Spaces\some file.txt"
or, if you are using a batch parameter
MyApplication "%1"
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Thank You Sir.
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Hello friends,
I stored an image from my front end(VB) into SQL database on a datatype image. Then how can I show that image in VB. Please help
While loading it through recordset I get this '????' .
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Actually wat u want
Regards;
Sherin PM
Quadra Software Solutions Pvt. Ltd.
Email:Sherin_pm85@yahoo.com
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This is the sample Code
where 'FileContent' is the field name of Image and it will save the file in C:\ to open File, where document COde is the primary key in table.This Code opens all kind of File.
Dim RstRpt As New ADODB.Recordset
Set RstRpt = "Select FILECONTENT from tablename" _
& " Where DOCUMENTCODE ='" TXTBOX1.TEXT & "',CNN,ADOPENKEYSET)
Set strStream = New ADODB.Stream
strStream.Type = adTypeBinary
strStream.Open
strStream.Write RstRpt.Fields("FILECONTENT").Value
DestinationFile = "C:\" & Trim(TXTBOX1.TEXT )
strStream.SaveToFile (DestinationFile), adSaveCreateOverWrite
'FileCopy SourceFile, DestinationFile
SetAttr DestinationFile, vbNormal
Call ShellExecute(hwnd, "Open", DestinationFile, "", "C:\", 1)
Hopefully i will help u
Ali
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Hi friend,
I was not at site for these days. That's why i cant reply you. So what is this 'ShellExecute' i can't made it. Is there any references to add?
by Dileeeeeeeeeeep.
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Hi'
a file is created but it is not a picture format.
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So, Let's start from Scratch
U have to set the datatype of this fiel is null because there is no way to
insert an image with other data. First u insert the other info in table and leave it null then update this row by sending the image.Remember 'FileContent' is the field name of Image. Data will be store in Binary Form and when u will retrieve it it will need space to store itself to be opened.
Here is the Code to Insert first.
AdoConne.Execute "Insert into DMSDOCCONTENTTRN (DOCUMENTCODE) values ('" _
& Trim(lbl_DocumentCode.Caption) & "')"
'Now send the Image or Any file in Binary Form.It will take some time depends upon the size of file so have patience.
Dim mFIlePath As String
Dim RstRecordset As New ADODB.Recordset
If RstRecordset.state = 1 Then RstRecordset.Close
RstRecordset.CursorLocation = adUseClient
RstRecordset.Open "Select * from DMSDOCCONTENTTRN Where DOCUMENTCODE = '" & (lbl_DocumentCode.Caption) & "'", AdoConne, adOpenDynamic, adLockOptimistic
Dim b
b = RstRecordset.RecordCount
Set strStream = New ADODB.Stream
strStream.Type = adTypeBinary
strStream.Open
strStream.LoadFromFile Trim(lvw_LoadFile.ListItems(Lint_LoopFile).Text)
RstRecordset.Fields("FILECONTENT").Value = strStream.Read
RstRecordset.Update
Now File has been store in Database Completely and First Phase is Completed.
Now u need to download it. So Wait I simplify the Code for U... Wait
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For Downloding...
'Declare on Gen.DECLARATION
Private Declare Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" (ByVal hwnd As Long, ByVal lpOperation As String, ByVal lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As String, ByVal nShowCmd As Long) As Long
'This line is also declared on Declaration with both,uploading and downloading
Dim strStream As ADODB.Stream
Dim RstRpt As New ADODB.Recordset
Set RstRpt = ModFncRecordSetReturnRst("Select FILECONTENT from DMSDOCCONTENTTRN" _
& " Where DOCUMENTCODE ='" & txtcode.text & "'")
If RstRpt.RecordCount > 0 Then
Set strStream = New ADODB.Stream
strStream.Type = adTypeBinary
strStream.Open
strStream.Write RstRpt.Fields("FILECONTENT").Value
DestinationFile = "C:\" & txtcode.text
strStream.SaveToFile (DestinationFile), adSaveCreateOverWrite
'FileCopy SourceFile, DestinationFile
SetAttr DestinationFile, vbNormal
Call ShellExecute(hwnd, "Open", DestinationFile, "", "C:\", 1)
'it will save it in C:\ and Open it from the C:\ Path
'In case of Any Trouble Ask me.
Take Care.
Bye.
Regards;
Ali
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hi,
i have developed a client-server application in vb.net.
I am using a socket class in this application.
I have written the following code:
Dim wsTCP As New TcpClient
Dim nwStream As NetworkStream
Dim byt_Buffer() As Byte
Dim async_CallBack As AsyncCallback
Dim ipLocal As System.Net.IPAddress = IPAddress.Parse("MyIpaddress")
Dim wsTcpLst As New TcpListener(ipLocal, portno)
wsTcpLst.Start()
If wsTcpLst.Pending = True Then
wsTCP = wsTcpLst.AcceptTcpClient
wsTCP.Connect(ipaddress, portno)
nwStream = wsTCP.GetStream
byt_Buffer = System.Text.ASCIIEncoding.ASCII.GetBytes("hello")
nwStream.BeginWrite(byt_Buffer, 0, byt_Buffer.Length, Nothing, Nothing)
wsTCP .close
endif
I am getting the error:
Only one usage of each socket address (protocol/network address/port)is normally permitted
at line wstcplst.start.
Please help me out at the earliest how this can be resolved.
Thanks in advance.
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Some other application would appear to be already listening on the port you want to use. e.g. If you are listening on port 80 then you'll have to shut down IIS first (because it got there first)
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how it can be done, from client application i am sending data server.
both are listening the same port which is required so that they will be able communication.
so how can i keep the port open at both end to listen.
how iis can be shut down.
Please elaborate.
thanks.
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i think u should change the port name .
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d_smita wrote: both are listening the same port
Then how do you test or use your application when the client and server happen to be the same machine?
You listen on one port and you send on another.
When you use IE to browse the web, IE sends data to port 80 of the server, but it listens on port 3xxx for a reply. Remember for any communications you need two end points - the end point on the client and the end point on the server.
Typically the server will be listening on a static port. This is necessary because clients have to connect with it some how. The client can use a variable port because it has the opportunity to communicate that with the server. It means that the client can also have multiple ports open to the server.
So, your client initiates the communication and opens a socket. The server will respond on that socket.
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