Using VB.net 2008 .net 2 to create an xml file from a dataset After the writexml statement the file is created OK When the stream is closed the xml file gets deleted?
code
Dim
dssettings As New DataSet("SAMSettingsDS")
Dim tblsettings As New DataTable("SAM")
[Code].....
Is there a way to identify a file is being deleted and prevent the action. It should ignore moving a file and renaming a file. Is it possible to code this in VB.NET.
View 2 RepliesI developed an application wich places some files in the programsfolder. If i manualy delete one of these files wich are not realy important for the application then when i restart the application i see that somthing like an installer places the original file back again in the folder. Someone can explain why and how i can stop this from happening? I would rather create the file during installation but i still cant find out how.
View 2 RepliesHow do you save a file right before it's deleted, relying on an event? (Preferably from a FileSystemWatcher.)
View 4 Repliesdeleted the unused image file
View 4 RepliesIs there a way in vb.net to undelete a file (deleted from Recycle Bin) or should i turn to unmanaged code? Write your code as efficient as you can to reduce CPU load, to consume less energy and protect our planet from global warming.
View 5 Repliesfor example i have this code :
Sub Month()
Dim Conn As New Data.OracleClient.OracleConnection
Conn.Open()
Try
Dim Cmd As New Data.OracleClient.OracleCommand
With Cmd
[Code]...
What will happen to the datareader when the Connection is closed ( Conn.close)
Will the Cursor that is used by the datareader be freed ? or will it stay open ?
If the cursor that is used by the datareader is still open , when will it be automatically closed ? or should i just closed it manually ?
Will it cause the dreaded "ORA-01000: maximum open cursors exceeded" ?
I deleted the images that I thought I will not need but the program would not run. Error 1 Invalid Resx file. Could not find a part of the path 'E:Code6 04-01-2010 evening Code5 ResourcesIMG_3514.JPG'. Line 123, position 5. E:Code6 04-01-2010 eveningCode5My Project Resources.resx 123 5 Code5.I even deleted the folder to make it worse.The project is code5 but it is running inside the folder of code6.
View 3 Repliessource code of recovery file with vb.net? can vb.net search file when the file is deleted?what the source code for the search?
View 1 RepliesI really am stuck. I can add records to a table ok . when i close and restart my code the new records are still there but deleteing does not work. I delete the records, they disappear. I close and restart the code agian but the deleted records return. this is my code.
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I can't understand why I'm getting this error. I'm trying to parse a tab seperated file. After 10 lines being read it throws the above error which is an ObjectDisposedException.
Public Function readNextLine(ByRef buffer As Single()) As Boolean
Dim i As Integer
Dim tempString As String()
[Code]....
I can't understand it, it's called and operates fine for the first 10 iterations and on the 11th throws and error. There is nothing special about that line in the log file.
I'm testing out the use of shells and I want to know if theres a way to check if the shell is exited.
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in an winForm app in VS2010 win 7 compiling to x86, I try to do what Alvas.Audio seems to work. See (c# ex: [URL] for reference.
Dim data() As Byte = wr.ReadData(second * i, second)
The result give me data.length()=0. I do not have any exception, I can read format from it and whatever reader I use I got this problem.EDIT : After some tests, it seems like the uncompressed file I create in the first step (in PCM format, with .wav extension) can not be recognized by the Alvas.audio library for the second step. I must miss something around Audio file markups or something alike.
Here is the code that might be the source (basically this is step 1):
Dim functOut As String = String.Empty
Dim wr As Alvas.Audio.IAudioReader = Nothing
Dim fs As IO.FileStream = Nothing
[code]....
How can I write the resulted stream to be sure I can read it again later?
I don't know whether it is simple or not because i am new to programming. my requirement is : In my vb.net winform application, the filenames of the files present in "D:Project" willbe displayed in DataGridView1 control. Now I want to load these files one after another into memory stream buffer and add the headers("ID","Name","Class") to the content in the file. Then I want to save these files in "C:" with "_de" as suufix to the filename i.e.,sample_de.csv.
View 1 RepliesI am writing a backup program that zips files. Using some sample code I have the following that creates a zip file. Problem is it does not get any subdirectories or files. Where am i going wrong?
Dim azFileNames() As String = Directory.GetFiles(SourceFolder)
Dim objCrc32 As New Crc32()
Dim zipStream As ZipOutputStream
[CODE]...
Alternativley, there is another component to the zipping dll that I could probably bypass the above altogether. It is: FZ.CreateZip(DestFile, SourceFolder, True, "", "") Where DestFile is (Output stream as system.io.stream). I'm trying to read all the files, directories, sub dir and files, etc from a specific location, let's say 'My Documents' into Destfile in which the FZ.CreateZip zips the file. FZ is FastZip which is from icsharpcode.net. They have c# examples, but that's greek to me. I'm trying to just learn VB!
If i use a stream to modify few bytes in a file without changing the total number of bytes
does the stream rewrite all the file even if just few bytes have been replaced?
Is there anyway to take a static stream reader, and switch it to another text file based on the user changing the file?
View 1 RepliesPrivate Function GetImageSize(ByVal FileName As String) As Size
Dim ImageSize As Size
Using BR As New BinaryReader(New FileStream(FileName, FileMode.Open))
Do
[code]....
I want to display photos of people when the mouse passes over their name. I wanted to be able to size the picture box to be proportional to the various photographs and let the Stretch property handle the rest.I used the code above offered by John Wein to a question from 2009 to read the dimension of the picture It worked fine until I pass over the same person twice. Then I get an error that the file is in use by another process.I tried adding:
"BR.Close"
With and without
"BR.Dispose"
But the file is still locked-out on the second pass. I tried setting "PictureBox.Image = Nothing" when the mouse leaves the square, still the file is seen as in use and locked.
I am trying to delete a file after viewing it. I loosely copied the code from [URL]. The problem I am running into is the filename I am passing is still in use after I close this form. How to get id where the file is being held open. Here is the relevant portion of the code. This is how I am opening it
Private Sub TifViewer_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
PicImage.ImageLocation = PassedImage
PicImage.SizeMode = PictureBoxSizeMode.Zoom
cboFrameNo.Items.Clear()
'Sets the tiff file as an image object.
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i would like to ask is there anyway to read a txt file with UTF-8 encoding using streamreader or filestream. the txt file is contain some extended ASCII that makes me cannot read the characters properly. I hav tried Encoding.ASCII.GetString(Encoding.UTF8.GetBytes()) but still it return wrong character when it's reading extended ASCII code.
View 2 RepliesIm making a desktop player for a online web radio, and for the program I wanna make it show all the stream info. Like the stream name, and such. However I dont know how to do this? I looked everywhere
The server url is setup like this "[URL]" And it has all the stream info and that there. So is there a way I can get the info from there onto like say a label? Live updates btw.
So I am having a situation where sometimes my code will error saying the file is already open (the text file). It happens randomly, and I'm assuming it's the computer hanging. Is there a way that I can make the program "wait" for the file to close?Here is the code that I am working with:
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I'm using the code below in a separate (background) thread, in order to read parts from a file, so they can be uploaded.
The problem is that when the user stops the upload, the thread is sometimes aborted while it's still reading from the file. This keeps the file locked and when the user starts the upload again, the following message appears.[code]...
i am making a game in which the file stream gets a certain file(lets say a.txt) and it reads it, if it has certain values stored in the file it returns boolean(this is a function), then a sub procedure writes to the file using a streamwriter and a filestream using the same file. I am having problems, sometimes visual basic says that another process is using the file, this is before i closed the filestreams and the streamwriter or streamreader, then it gives me errors when i close the files, it tells me that it can't access a file that is already closed, i thought the filestream gets the file and lets the streamreader or streamwriter read or write to the filefound out the problem?
View 2 Repliesis it possible to report the percentage of file written by a file stream wile it is writing a large file?I am using a code like this one to write a large file
Using Fs As System.IO.FileStream = System.IO.File.Create(FolderPath)
Dim bf As New BinaryFormatter()
bf.Serialize(Fs, data)
End Using
I am reading a large number of XML files and do not want my program to bomb on exceptions. I am making great strides in reporting the errors, skipping the offending files and continuing the import process. However I am having problems with XmlExceptions. I get the following XmlException on the While textReader.Read() line of my program:
Quote:
XmlException was unhandled
Unexpected end of file has occurred. The following elements are not closed:
my:PicInsert, my:PictureGroup, my:myFields. Line 153, position 430817.
I am finding some of the reasons why, missing tags etc, but those aren't really my concern. I just want to report the issue and continue. I am thinking about some kind of check for a valid xml file but fear that that might not catch it all. For example I had a image tag in one of the files that was missing an alt="" attribute and I am not sure if that would invalidate the entire XML file.What would be the best way to trap and deal with the exception with out causing interuption to the program?
I am trying to parse incoming data from a serial port that appears to be XML format but an exception is thrown when I switch from a simulated setup to the real deal.My program runs great in a simulated setup but when I try it out on the real device I get: XmlException was unhandled Unexpected end of file has occurred. The following elements are not closed: li840 line 1, position 9.The li840 tag is my root tag and the position never seems to get past 40. I've tried using a try catch block but in my in both my simulated and real setups my values are blank but the program will run without exceptions. Should I take my received data and put it into a file and then read from the file? or is there something else I can do to make this work properly? [code]
View 12 RepliesPretty much the only thing I have changed is created a loop because I have one xmlstring and want to break it up and create tif files from it(which it actually does do).My problem is this: readbytes inside the while loop throws an exception at the last time through the loop that says I have an "unexpected end of file; the following elements are not closed" and lists them
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So there are tags left open after the readtofollowing("image"). I tried catching the exception to no avail, tried to read until eof, no avail. I dont really need elements to be closed, I just need to continue because I created files using whats in the image tag.EDIT: I think my xmlstring is going to have times where it will be too big to do a parse without slowing down too much.../parsing binary data?
I have a 'next' button which changes the questions when clicked. How do i make the questions keep changing to another question from a file with only 1 button when clicked and also display it on a label with 4 radio buttons with answers in vb. I always get an error " Cannot read from a closed text file "
View 5 RepliesI've downloaded ZLIB.NET from here and the example VB.NET code they provide works fine. It's very short so I'll paste it here for reference:
vb
Public Shared Sub CopyStream(ByRef input As System.IO.Stream, ByRef output As System.IO.Stream)
Dim num1 As Integer
[Code]...
Note that the CopyStream() subroutine is identical. The problem is that although decompressing seems to work fine, compressing does not. If I take a byte stream, compress it and then decompress it using the above code, I get a truncated version of the original stream (as an example, a 360485 byte stream becomes 311518 bytes). The resulting bytes match the original stream up until the point where it's cut off.
The only information I can find about streams being truncated is due to missing stream.Flush() commands but the output stream is flushed in the CopyStream() subroutine.