Visual Basic Discussion Boards

Scott_Roberts26-Jun-06 8:19

26-Jun-06 8:19

I'm working on an applicaiotn that distributes files -- as they come into one directory, the file name is parsed, and the file is moved to the appropriate output directory based on the name.

I have it working well for the case where a file in the monitored directory is changed, or copied in from a local location.

I have two issues I'm having a problem coding for:

1) If the program starts and there are already files in the directory, I want it to work through the file list one at a time and process the files appropriately.

2) Sometimes the file is transferred in via FTP so it fires multiple change notifications. I want to ignore them until the transfer is done.

Thanks in advance for any help you can give!

best,
Scott

Re: Directory List/File Busy [modified]

Dave Kreskowiak26-Jun-06 8:52

Dave Kreskowiak

26-Jun-06 8:52

STemaat wrote:
If the program starts and there are already files in the directory, I want it to work through the file list one at a time and process the files appropriately.

OK, what's the big deal? Use the Directory class and it's GetFiles method to get a list of files in the directory and start feeding them to whatever routine you've written to process the files.

STemaat wrote:
Sometimes the file is transferred in via FTP so it fires multiple change notifications. I want to ignore them until the transfer is done.

There is no Closed notification in the FileSystemWatcher. It's impossible for it to know when another application is completely finished with a file before it notifies you. You're only workaround is to, every so often, try and open the file with exclusive rights (DenyShareRead and DenyShareWrite). Once the file successfully opens, you've got a pretty good indicator of whether or not the file is done being written by the FTP server. This, of course, depends entirely on the functionality of the FTP Server that you're using and how it writes to files as they're being uploaded.

Dave Kreskowiak
Microsoft MVP - Visual Basic

-- modified at 14:52 Monday 26th June, 2006

Re: Directory List/File Busy

Scott_Roberts26-Jun-06 8:59

Scott_Roberts

26-Jun-06 8:59

>>>OK, what's the big deal? Use the Directory class and it's GetFiles method to get a list of files in the directory and start feeding them to whatever routine you've written to process the files.

Hmm...someone here is a NOOB (namely me) Smile | :)

>>>You're only workaround is to, every so often, try and open the file with exclusive rights (DenyShareRead and DenyShareWrite).

Okay, think I can handle that.

Thanks.

Re: Directory List/File Busy

Dave Kreskowiak26-Jun-06 9:07

Dave Kreskowiak

26-Jun-06 9:07

STemaat wrote:
>>>OK, what's the big deal? Use the Directory class and it's GetFiles method to get a list of files in the directory and start feeding them to whatever routine you've written to process the files.

Hmm...someone here is a NOOB (namely me)

You never said what part of that you were having a problem with...

Dave Kreskowiak
Microsoft MVP - Visual Basic

Re: Directory List/File Busy

Scott_Roberts26-Jun-06 9:16

Scott_Roberts

26-Jun-06 9:16

Really what I was hoping for was a code snippet in both cases. I am having a hard time finding examples I can wrap my mind around/adapt, and neither topic is covered well in the textbook for the class I took last semester.

I think I'm getting my mind warapped around the first one...my thought is to simply "touch" every file that happens to be in the directory, which would fire the changed event of the watcher.

First concept that comes to mind on the second issue is putting the file open into an Until loop.

Am I on the right track?

Re: Directory List/File Busy

Dave Kreskowiak27-Jun-06 1:29

Dave Kreskowiak

27-Jun-06 1:29

STemaat wrote:
I think I'm getting my mind warapped around the first one...my thought is to simply "touch" every file that happens to be in the directory, which would fire the changed event of the watcher.

You could do that, but the FileSystemWatcher has been known to miss events now and then when firing alot of them all at once. "Touching" the files involves extra work you don't have to do. Just get the list of files and pass each one to the routine that does the processing. The event handler for the FSW should be doing the same thing.

STemaat wrote:
First concept that comes to mind on the second issue is putting the file open into an Until loop.

Yep. All you have to do is put the thread to sleep for a little while, maybe one second, inside the loop if the Open fails. That way you're not bogging down the system.

Dim attempting As Boolean = True
While attempting
    Try
        ' Open the file for exclusive read/write
        ' close it
        ' pass the filename to some method to do the actual processing
        attempting = False
    Catch
        Thread.Sleep(1000)
    End Try
End While

Dave Kreskowiak
Microsoft MVP - Visual Basic

Re: Directory List/File Busy

Scott_Roberts26-Jun-06 12:59

Scott_Roberts

26-Jun-06 12:59

As a follow-up...I fixed the second part of the problem by changing the Watcher trigger to changed, instead of created. That was all I needed in this case Wink | ;-)

Got the ifrst part handled, too. Thanks for your help!

controlling playback speed of audio files.

mkm300526-Jun-06 7:41

mkm3005

26-Jun-06 7:41

hey i would like help some help regarding the playback speed...
i would like to increase or decrease the speed with which an audio file is played..depending on the users choice..it shuould be variable in as low as 5% increment/decrement.

help me i am new

Re: controlling playback speed of audio files.

Dave Kreskowiak26-Jun-06 8:47

Dave Kreskowiak

26-Jun-06 8:47

This depends entirely on the object or API that you're using to play the audio file. If you're using just the Win32 API, you can't change the playback speed. In this case, you'll have to find a 3rd party media player that supports what you want.

Dave Kreskowiak
Microsoft MVP - Visual Basic

How do I use Select Case on checkboxes in a Groupbox control?

Rashar26-Jun-06 6:34

Rashar

26-Jun-06 6:34

In Vb, I would have an option or groupbox, with checkbox controls on it. I could set a value for each checkbox and then write the following code...

Select Case optGroupbox1<br />
<br />
   Case 1: 'checkbox 1<br />
           'statements<br />
   Case 2: 'checkbox 2<br />
           'statements<br />
End Select

How would I implement the above code in vb.net?

I've tried the following but vb.net does not like Case chkbox1.CheckState = CheckState.Checked call...

Select Case GroupBox1.Controls<br />
<br />
            Case chkbox1.CheckState = CheckState.Checked<br />
                  'statements<br />
End Select

Thanks in advance.

Re: How do I use Select Case on checkboxes in a Groupbox control?

Dave Kreskowiak26-Jun-06 8:45

Dave Kreskowiak

26-Jun-06 8:45

Rashar wrote:
Select Case GroupBox1.Controls
Case chkbox1.CheckState = CheckState.Checked

VB.NET won't work like that. Since you've specified GroupBox1.Controls in the Select statement, you can only specify properties of the Controls collection, not it's contents.

You'll have to enumerate the controls collection to get this to work:

For Each gbc As Control in GroupBox1.Controls
    Select Case gbc.Name
        Case "chkbox1":
            If gbc.CheckState = CheckState.Checked Then
                ...
            End If
    End Select
Next

Dave Kreskowiak
Microsoft MVP - Visual Basic

how can i convert vb6 source file to vb.net 2003 file

saneng26-Jun-06 6:24

saneng

26-Jun-06 6:24

while savinf the DTS package with visual basic file and converting it into vb.net file i get troublews how do i convert vb6 file to vb.net?

Re: how can i convert vb6 source file to vb.net 2003 file

Dave Kreskowiak26-Jun-06 8:35

Dave Kreskowiak

26-Jun-06 8:35

Recode it by hand. I have no idea what's your trying to say about DTS, but converting the VB6 code by hand is the best method.

Dave Kreskowiak
Microsoft MVP - Visual Basic

How can I convert VB6 to VB.NET2003

Adekolurejo26-Jun-06 6:10

Adekolurejo

26-Jun-06 6:10

I have a programme that I write using VB6 Now I want to Convert it to VB.NET2003
how can I achieve this.Also What is the Different between VB.Net and VB.Net2003.Thanks

Ademola

Re: How can I convert VB6 to VB.NET2003

Dave Kreskowiak26-Jun-06 8:30

Dave Kreskowiak

26-Jun-06 8:30

Adekolurejo wrote:
I have a programme that I write using VB6 Now I want to Convert it to VB.NET2003
how can I achieve this.

Open the VB6 projects .VBP file in Visual Studio and it'll launch the Conversion Wizard. I highly recommend not doing this and just rewriting the project from scratch though. The conversion doesn't do a perfect job of converting code and it will NOT take advantage of any improvements made in the .NET Framework or VB.NET language. It'll generate code that emulates and is functionally equivilent to VB6, but that's about all.

Adekolurejo wrote:
What is the Different between VB.Net and VB.Net2003.

VB.NET = VB.NET2003. VB.NET is an identifier that covers the language versions 2002, 2003, 2005, and above.

Dave Kreskowiak
Microsoft MVP - Visual Basic

VBScript to split file path into 3 bits

mil_an26-Jun-06 5:43

mil_an

26-Jun-06 5:43

Hi,

I am trying to write a sub-routine in a VBScript to split a file path into 3 bits.

For example I want to split the following path:
"C:\Program Files\MyProg\Studio\win32\bin\filt.exe"

into 3 bits:

1. C:\Program Files
2. \MyProg\Studio\win32\bin
3. \filt.exe

The First part will always be de-limited by 'Program Files' (or the 2nd '\').
The Second part will be delimited from the end of 'Program Files' to the last '\' in the path.
The 3rd Part will be delimited from the last '\' to the end of the path.

The source of the initial file path is stored in an input file, and the split path is to be stored in another text file in the following format:

"C:\Program Files" ** "\MyProg\Studio\win32\bin" ** "\filt.exe"

I hope this is clear, and someone will be able to assist. Any help will be much appreciated.

Thanks Smile | :)

Re: VBScript to split file path into 3 bits [modified]

Dave Kreskowiak26-Jun-06 8:33

Dave Kreskowiak

26-Jun-06 8:33

This is simple string handling.

You can use the FileSystemObject's GetFilename method to get the last part of the string.

You can use WScript.ExpandEnvironmentStrings to get the path to the Program Files folder (which is NOT always on C:!!). All you need to do is exand the environment variable "ProgramFiles" and it'll usually return C:\Program Files.

After that, it's simple string handling to get the middle part. Hint: What's the length of the strings returned by both of these calls?

Dave Kreskowiak
Microsoft MVP - Visual Basic

-- modified at 14:34 Monday 26th June, 2006

Re: VBScript to split file path into 3 bits

mil_an28-Jun-06 0:47

mil_an

28-Jun-06 0:47

Thanks Dave Big Grin | :-D

slovenian codepage

Marc Soleda26-Jun-06 4:46

Marc Soleda

26-Jun-06 4:46

Hi all,
I'm modifying an application written in VB6. I need to show into a dialog some data that is correctly stored in an Access 2003 database. The texts stored are written in Slovenian and when I use the Adodc::Recordset to retrieve them and show into the dialog they are shown badly.
Anybody knows what I should do or what I'm doing wrong?

Thanks in advance,
Marc Soleda

... she said you are the perfect stranger she said baby let's keep it like this... Dire Straits

Avoid Validation while closing the form

nagarajanrj26-Jun-06 4:43

nagarajanrj

26-Jun-06 4:43

I have some text boxes in a form.On leave event of the textbox control, I am validating the

values by pop uping the message.When I press the ESC or Cancel Button,I need to close

form.When the focus is on textbox control and the textbox is not empty on that time I am

pressing ESC button, that validation message is pop-uping.I need to avoid that pop up

message.

by Nagarajan

Re: Avoid Validation while closing the form

Dave Kreskowiak26-Jun-06 5:07

Dave Kreskowiak

26-Jun-06 5:07

Don't put the code in the OnLeave event. Put it in the TextBox's Validating[^] event and set the TextBox's .CausesValidation property to True. Check the documentation for an example.

Dave Kreskowiak
Microsoft MVP - Visual Basic

Removing application from the bottom panel [modified]

mikeskeeter26-Jun-06 4:24

mikeskeeter

26-Jun-06 4:24

Hi,

while programming quite robust application in VB.NET 2.0 a minor problem occured when the application is closing it sometimes "forgets" to remove itself from the bottom bar (there are no exceptions thrown, by clicking on it it simply disappears - which is obvious as the application is already closed). I remember that this was a problem in c++ too but it was removed by slight modification of events posted when the application was closing. I am quite surprised this happens here, where these events should be completely managed. The only closing event I am using for application purposes is just 'FormClosing'. Others I expect to manage by themselves.

Can someone tell me how to remove this flaw and properly close the application ? Thank you.

-- modified at 10:28 Monday 26th June, 2006

Re: Removing application from the bottom panel

Dave Kreskowiak26-Jun-06 5:01

Dave Kreskowiak

26-Jun-06 5:01

It's usually still there because you're forgotten to dispose of (release) either unmanaged resources or managed objects that hold onto unmanaged resources.

Dave Kreskowiak
Microsoft MVP - Visual Basic

Help required in mdi child form

bzasri26-Jun-06 3:15

bzasri

26-Jun-06 3:15

I have an application which connects to internet.After connecting to the net a new toolbat appears in main window.from the toolbar we activate a child window.I think that application coded in C++.My question is Can we access the child window through our code in vb.net please suggest books/readings

bzasri

Re: Help required in mdi child form

Dave Kreskowiak26-Jun-06 4:59

Dave Kreskowiak

26-Jun-06 4:59

Define "access that child window". If you're talking about just casting that window to a Form object in VB.NET, then no, you can't do that. The only method you have is sending Window messages to each of the controls on that form. It's a very cumbersome process to find the correct window handles for each of the controls you want to "talk" to and sending/retrieving data. There is no "easy" way to do it.

Dave Kreskowiak
Microsoft MVP - Visual Basic

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.