I'm in the process of nailing together a small program, the purpose of which is very simple: Monitor a number of various network locations for the existence of some files. when they spring into existence, check to see if someone is using the file and when it accessible, light up green and then I can go do what I need to do with it.[code]...
View 2 RepliesOur program will start with the help of a FileSystemWatcher object. How can we check or the file is total copied, for example the file is 100 Mbyte it take a time it's ready for use. Idea:
Do While True
Try
N = testForUse(BigFile)
If N = 1 Then Exit Do
[CODE]...
I've gone through about 16 hours and two packs of cigarettes trying to figure this out. First a little background. I was using 6.0 up until 2004 when I went to prison. I'm out now, and trying to relearn the trade, using VS 2005. I'm currently porting some 6.0 code from another project, SpyCast Webcam Studio, into VB 8.0. It's disheartening, to say the least. None of the old built-in subs/functions work anymore, so I have to scour the forums to relearn each and every function.The section I'm doing now takes a snapshot from the webcam (Video API --> PictureBox --> Save as Jpeg), then upens the file to upload it to the server via HTTP POST. I've been using this code in SpyCast for years with no trouble, but I spent many hours trying to piece together the right code to open the binary file to read its contents. I pieced together two methods I found around the forums, one using FileStream() though the code I found wasn't for binary files, even though it said it was, so that code doesn't really work. Method two uses Microsoft.VisualBasic.FileOpen() and works better.
Here's the kicker. By the time I run through the rest of the rigamarole of uploading the file, by the time I read it on the webserver, it's *slightly* corrupted. It's a valid Jpeg, no errors, but the picture looks like when I use to watch the Playboy Channel when I was a kid scrambled with weird colors and whatnot. [code] Each "chunk" is basically one "line" of the file. It looks like a single LineInput() return is the text between two carriage returns. Am I correct? I tested this with a flat text file, and it looks true. However, That one input line returns the text or data with the carriage returns *stripped*! ***?!? =( Fine, I have no problem adding my own vbCrLf to each LineInput(), if I were opening text. but this's binary. A character could be Chr(10) or Chr(13), both of which are removed from the original file contents.So I could very well need to use something other than LineInput(), but I haven't found any other examples on the web using this method.
how I could check if a certain file is in text or binary format?I'm using VB.Net 2008 Express.
View 2 RepliesCheck file size and take backup and re-create file? I am using this function[code]...
View 4 RepliesA user exported a excel file and he opened it.Some reason, he tried to export same exel file as same name.Then, the application is gone because it does not know what do with it.How do I check the excel file is opned or not when I try to export as same file name again?
View 2 RepliesI am trying to create a log in module for my program with the following
[Code]...
I got no clue how I can check the file size of some file. I would like to be able to determine the size of example. "C: estfile.txt". How can I do this in VB08?
View 3 RepliesI have a routine that uses windows compression to zip a file. It uses shell32. Rather than maintaining a five second timer for each file, I would like to check to see if the file is closed, not locked, etc., before moving on to the next step in my program. I've searched, and while I can try to open text files, zip files are not text files. I tried renaming the file, but it seems this is actually slowed while files are being added. [Code]
View 2 Replies[code]but i got this error message, "The process cannot access the file 'kls3FBE.tmp' because it is being used by another process."How can i check the file is currently using or not?
View 9 RepliesI have an update program that is completely independent of my main application. I run the update.exe to update the app.exe. To check to see if the file is in use, I move it to another file and catch an error if it is in use. If no problems occur I rename it back. At least that was my plan.
Main program: app.exe
Update program: update.exe
This program is used over the network without any services running. So, the users is quite literally running the exe over the network on their machine. I need to update the app.exe when the update.exe has run. To check to see if the app.exe was still in use I was wrapping the following in a try/catch to see if it failed:
IO.File.Move(upddir & "app.exe", upddir & "app.exe.tst")
IO.File.Move(upddir & "app.exe.tst", upddir & "app.exe")
The funny thing is, even if the app.exe is running, the move can rename it to the app.exe.tst without any error. I can even continue on in the application without any errors. I thought I was out of my mind, so I had another programmer look at this and he verified what I said above. So, we tried this wrapped in a try catch: [Code] I put the fileshare as none that, at least I thought it would, show that there was someone in the file. It still continued without any error. Anyone know why I can rename a file in use? Also, is there a better way to do this than what I am doing now?
below code i am using to check whether fileupload has image or not but its only showing 1 message pla upload image
and also i only want to change the image name not the extension
<asp:Label ID="lblResourcesImg" class="lbl" runat="server" Text="Upload Image"></asp:Label>
<asp:FileUpload ID="ImgUpload" runat="server" CssClass="Upload" EnableViewState="true" />
[Code].....
I am trying to check for a file on the system then run that file. Please to do laugh to hard at my code.
[Code]...
I am working on hex values of a file.Now to test it i delete single byte and then try to write the file using the remaining bytes.Well the file gets corrupted but still the file is constructed.
View 9 Repliesscenario:
-folder x resides on server a, server b ,server c
-x contains same set of files in a,b,c
whenever any file gets modified in a, it should get also modified in b and c as well
similarly b->a,c and c->a,b
my idea of implementation is -when ever any file is modified on a server, compare timestamps and force copy the modified in the other two How should i go for implementing it?
1)how to check if a file is modified
2)how often this check should be done and how this should be implemented should a service be running to perform thi check i want to do this using .NET?
I need to check if a .txt file is empty, if it's not, the code will read the file and process the information.I know how to read .txt file. Is there a way to check if the .txt file is empty? not an empty line just completely empty?
View 3 Replieshow do i verify a file like a image or html exist on the web?
View 6 RepliesThe following code works to check if a file exist, but I need to also check if the file is open. How would I do that?
[Code]...
When user clicks on the button, it will ask him to choose a specific file. It checks the MD5 to know if this is the right file.[code]...
View 1 RepliesI want to copy a file but I do not what to copy it if it is being written to so, I want to see if a file is in use. I have tried 2 different code snippets
1) This one works if my file is open with MSWord (anything that creates a temp file while writing to it.[code]...
Have only just started trying Visual Basic after using Delphi almost ever since it first came out. How on earth do I see if a file exists? - simple terms please
View 2 RepliesHow to check if a file can be overwritten? Currently I have a problem with files that are
1. In use
2. In a folder where I don't have permissions to edit them
3. Read Only
How to check (check, not overwrite) if a file can be overwritten?
I need a snippet to check file for validity (I'm allowing users to upload xml files). So I need to check whether uploaded file is XML. The best I can think of is just check if extension is ".xml". What if its replaced?
View 4 RepliesI'm making a program in which a couple of txt files will be used for reading and writing (streamreader/writer). Incidentally, these txt files might be in use by another program, although never more than 1 or 2 seconds each time.
Suppose, I have the following
Dim Input As New System.IO.StreamReader("c:data.txt")
Data = Input.ReadLine
...more code...
[Code].....
This doesn't work though. When I open c:data.txt in another process and run my VB application, I still get the IOException.
how to check a file which i want to delete is not more used by another process?I have a program it creates a temp file less than 1KBthen it sends it like an attachment in the emailthen I have to delete it,but cannot do it because exception comes out that it still used by another process
Try
Dim AnEmailMessage As New MailMessage
AnEmailMessage.From = New MailAddress("bla@bla.com")
[code].....
How can i check a file's md5 if it's equal to one in a listbox?[code]...
View 3 RepliesI have a list of users with me and I need to find out programmatically which of the users present in the list have read/write permissions on a particular folder/file.
View 2 RepliesWhat is the easiest want to check if a .dll file exists, then to load it ? ( i don't need to use modules from that dll file, i just want to run it ).
View 1 RepliesCurrently to check if a file is in use (before attempting to move or send it by FTP etc) we try and open it with exclusive right and trap the System.IO.IOException that would occur if anotehr process is reading or writing the file.
However - how can we do this without the bad paractice of using an exception handler for unexceptional process flow?
Supposedly I create a file called "hi.txt" and I use Process.Start(filename) to open it. then I File.Opentext(filename), edit it and close it using stream writer/reader, while I still have that file open.
In order to see the changed text I need to close "hi.txt" and reopen it.
Is there a way to automatically do that? Been experimenting a bit but with no luck.