Is there a way to lock a file without having to actually open the file and maintain a "connection" to it from my VB app? This should then prevent other users from writing/deleting/renaming the file. But I also want to allow only my app to write/delete/rename if need be.
View 13 RepliesI've searched high and low for an answer so I'm hoping someone can help me out and I hope I explain what is happening ok. I have a number of people testing an application and one of them in particular is running into this error repeatedly. The error does not happen on my machine or almost any other. I know it is in relation to database usage but what I can't figure out is why the user only gets the error after the database has been called x number of times (and closed each time its done being used) as opposed to why the program doesn't crash the first time the database file is accessed.
The database is in MS Access and here's some pertinent info from the code - and the error is not subject to any particular database call...it just seems that after so many hits to the database its had enough and it crashes.
[Code]...
Like I said, why would the code work on almost all other machines (he's got a newer machine too and has tried both XP and Vista machines) and if there is something about his system why does is successfully call and use the database for awhile but then crashes out seemingly after a certain number of uses of the database file? I know it is not a specific call to the database because the area the application typically crashes for him at can be bypassed by changing some of the options available to the user - when he cuts back on the options used the program simply crashes at a later point in the process.
I am using XML files to store some iformation that are to be processed. I use this code to interact with the XML file:
Dim xmlDoc As New XmlDocumentxmlDoc.Load("theXMLFile")
Do XML stuff such as add elements...
xmlDoc.DocumentElement.AppendChild(oAlarm)xmlDoc.Save("theXMLFile")
What I want to do is to lock the file so that no other process can use the file. If a process wants to use the file, I also want it to wait and try again until file is available.
.NET 1.1VB 2003i have create a program where the program will dynamically create a mdb file, create a table, then populate the table via ADOX.dll using com interop.After populating the table i would like to FTP the said file to some FTP folder, to my dismay everytime i try to upload the mdb file i always get 0 kb, then i found out that the mdb file is "FILE-LOCKED" by some unknown process, but i dont know why because i have manually released all the resources that has been used, here is my code
[Code]...
Dim bmi As New BitmapImage(New Uri(fiInfo.FullName, UriKind.Absolute))
bmi.CacheOption = BitmapCacheOption.OnLoad
this does not Use OnLoad
[code].....
I am using Ms Access 2000 on a Windows Server 2008 and I have four users connected on a network to the server accessing the databases through a VB6 application which is loaded on all of the users' computers.While using the VB6 program i receive the error "Error 3050 Could not lock file".I know it has to do with the .ldb file.I have checked the permission and all users have full read/write/modify rights on the drive and the folder that the databases are stored in.I checked the MaxLocksPerFile and it is set to 9500.I even tried compacting and repairing and still this error persists.
View 5 RepliesI have a .Net 4 WinForms app that generates a DLL, calls CreateObject on the generated DLL then calls one of several methods that the DLL contains. The DLL is eventually used by a separate app. This WinForms app is just to generate and test the DLL hence why it can generate the DLL multiple times.The problem lies in the fact that calling CreateObject on the DLL locks the file to the process. The next time the DLL is generated it can't overwrite the previous DLL file on disk without closing the app completely and starting it again.
I've tried Marshal.ReleaseComObject, executing the CreateObject in a separate AppDomain, even setting the variable holding the COM object to a different COM object via CreateObject, manually calling GC.Collect() and a whole host of other things but none result in unlocking the file.The code flow is basically (simplified and generic names, etc.):
...
' Compile and generate DLL that is COM enabled and works fine
...
Dim foo As Object = CreateObject("Bar.Foo")
[code]....
is there a way to release a file lock on a COM DLL that has been instantiated via CreateObject without killing the process?
Note: this is a continuation of this original issue. I now have the DLL registering without locking the file but now the issue is with the CreateObject call not the DLL registration.
How would I Create a New .txt File & Lock it with a Password with VB8....?
View 5 Repliesi'm getting this error: "File sharing lock count exceeded. Increase MaxLocksPerFile registry entry." i know i can manually go into the registry and edit this, but is there a way to do this in code?
View 2 Repliesi have written a small app that:-Periodically captures a portion of a screen to jpeg file-Uploads this file to ftp serverAt first i used My.Computer.Network.UploadFileand it worked like a charm. Then i wanted to move to FtpWebRequest async. The reason was because i implemented a global keyboard hook and locking the main thread for upload, disabled my keyboard.I copied the example in MSDN regarding FtpWebRequest. the problem i have is that it seems that the file that is being uploaded is locke
View 1 Replieshow I can lock a file so it will be completely written to by the first application, then unlocked for reading by my second web ticker app? My IDE is VB 2008. The second app has a ticker timer which I can modify accordingly. However, I'm still concerned whether the web app will encounter a situation where it competes for file access.
View 2 RepliesI have difficulty in removing the LDB generated by the "CREATE" method of ADOX in the following code segment.Aims: Create (on the fly) a new access database and then export data (says Arena modules) to that newly created database.
Expected: The newly created access database should be able to be used by some external operations, say Access.exe, after the end of the subroutine and without exiting the current VB program.
1) I tested that the "Arena code" do nothing about the create/release of the ldb file.
2) I tested the "Exclusive Mode" in connection string, but the access file is still locked by the vb program.
3) I tested under both inside the VB environment, and directly invoke the generated from Explorer, and same results.
4) Other database formats is not the options to me. (due to Arena export limit)
5) It is not a web app.
Code:
Sub Method1()
Dim logs As New System.Collections.Generic.List(Of String)
Dim arenaApp As Arena.Application = Nothing
Try
[code]....
Platform:
Windows 7 64bit, Office 2010 (32)
VB 2010 express
Lib: MS ADO Ext. 2.8 for DDL and Security
I am writing a program that acceses a file in VB/Visual Studio 2008 on Win7 and running it as a user who has admin credentials. I am opening the file with the following code:
Dim Input As New FileStream("C:FileTest est.txt", FileMode.Append, FileAccess.Write, FileShare.None) To test to make sure I can't access this file, I tried to open it with Notepad and I was able to and got no errors. I wrote a new value using Notepad and even saved it and I didn't get any errors form Notepad or my VB program.
I then went on and treid to open the same file twice from my VB program as:
Dim Input As New FileStream("C:FileTest est.txt", FileMode.Append, FileAccess.Write, FileShare.None)
Dim Input2 As New FileStream("C:FileTest est.txt", FileMode., FileAccess.Read, FileShare.None)
And I receivded an error in my VB program as expected. So the FileShare.None switch kind of works. Although I was still able to open the file with Notepad while my VB program had it open. I was aslo able to open Windows Explorer and reame it and even delte it while my VB program had it "open", in the write mode no less without my VB program knowing anything about it.
Why are other applications able to ignore the FileShare.None switch? Seems pretty useless if that's the case. And a huge secruity problem
I have developed a .net application with sql server 2005. I want that when my application starts caps lock key should be turned on and when I exit, the caps lock key turns off.how is it possible
View 1 Replies1. I have to create a file. 2. Then I want to write a string into the text file.
I can do part 1 no problem with: File.Create(strFilePath) But when I try part 2 to write to the file it won't allow this as it's still being used:
sw = File.AppendText(strFileName)
sw.WriteLine(strCode)
sw.Flush()
sw.Close()
My code in part 2 works fine on a file that hasn't just been created.
How do I release the file from the File object?
There doesn't seem to be a .close or .flush option.
I would like to know if there is any opportunity in VB.Net to use atomic operations. Or Maybe there is an opportunity to check if a file is allready in use or opened.The reason why I ask is because I got a little application that I would like to log its actions. As the applications uses threads the method for writing the log file sometimes is trying to open the log-file more than once which leads to an exception.
View 3 RepliesI want to lock my form to be full screen, and not allow the user to move it. For the form, I set
[Code]...
The form is full screen, but I can shift the location. I do have a dual screen system. The application goes full screen on the left most screen. This does this inside the development environment and using the EXE. What am I missing? I thought Locked is suppose to prevent the form from moving.
i want to create an exe in vb.net by packaging few perl files along with it. when i am packaging those files i am able to hide those files by making the hide option true. but if the 'show hidden files' is selected those files will be visible. I want to lock/prevent the user from opening the perl file/code. want to know if there is any way to do it.
View 1 RepliesI want that when I start a particular vb.net application, the caps lock should be automatically turned on. How can this be done?
View 1 RepliesI have a program which records the phone numbers I dial into one program into its own textbox. But whenever I use numlock to type the phone numbers in, it appears as "abc, etc" in the recording program.
View 1 RepliesI wanna load XML file with XDocument.Load method and lock it. How to do it?
View 5 RepliesIm really bored an I can't think of another program to make but im going to give it a shot. Im trying to make a program that can turn on caps lock when you push button 1(Yes I know theres already a caps lock button on the keyboard Lol) and turn on off caps lock with button2. Im am also trying to see everytime i push button 3 it will hold shift down for as long as o dont let go of the left mouse button but when I let go of the left mouse button it will let go of button 3 and shift will be off O.o. Is there a way to do this?
View 1 RepliesWe needed an inter-process reader/writer lock.We decided to use a file and lock the first byte using LockEx and UnlockEx. The class creates a file in the system temp folder when it is created. The file is created with readwrite access and share read|write|delete.We also specify DeleteOnClose so we don't leave loads of temp files laying around. Obviously AcquireReader and AcquireWriter call LockEx with appropriate flags and ReleaseLock calls UnlockEx.We have tested this class using a small application that you can run several instances of and it works perfectly. The application that uses it has a problem, which we have managed to re-produce in another small test app. In pseudo code it is
Create InterProcessReaderWriter
Dispose InterProcessReaderWriter without acquiring any locks
Launch a child process which takes a reader lock
The first time this runs, it works fine. If you attempt to run it again, while the child process from the first time is still holding the lock, we get an UnauthorisedAccessException when trying to open the file.This appears to be a permission issue, not a sharing violation but all the processes in this test case are running as the same user.
lock from reading/writing/copying a loaded XML file with XDocument.Load [VB 2010]?
View 1 Repliesi want that when i start a particular vb.net application, the caps lock should be automatically turned on.... how can this b done ?
View 1 RepliesI want to disallow changes to two comboboxes unless the user first clicks a LOCK symbol on the screen. I pop a Y or N into the tag of the picture box when they click it...I've got this - combobox is called LanguageTo
Private Sub LanguageTo_Enter(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LanguageTo.Enter
If Me.languageLock.Tag.ToString = "Y" Then
MessageBox.Show("Click LOCK symbol to allow changes to the Language Pair!", "Language is Locked!", MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
[code]....
How do I "cancel" the attempt to change that combobox?I don't want to ENABLE=FALSE the combobox - as I don't want it's image to visually change. I want to allow them to attempt the change and then abort it if they didn't unlock first.
I�m using VB.Net 2008 application program.I�m using DataGridView. I have a Print option where i need to print the DataGridView. I�m using this code for Printing and for Print Preview.
Code:
Dim MyDataGridViewPrinter As DataGridViewPrinter
Private Function SetupThePrinting() As Boolean
Dim MyPrintDialog As PrintDialog = New PrintDialog()
[code]....
Attached the class i'm using for print.I have 10 fields showing in datagridview. As the last 5 columns header is long, the datagridview is not fitting inside 1 page (not showing all 10 fields in one single page). But is there a way i can "Text Wrap" the top header column and lock in the width, then it should print across one page perfectly.If you know how i can "Text Wrap" the top header column and lock in the width to print across one page?
using DataGridView. I have a Print option where i need to print the DataGridView. sing this code for Printing and for Print Preview.
Dim MyDataGridViewPrinter As DataGridViewPrinter
Private Function SetupThePrinting() As Boolean
Dim MyPrintDialog As PrintDialog = New PrintDialog()
[code].....
I am getting the below error when I click a row in the grid. But this error is raised only in exe, which is installed in client machine, but when I check the same from source code in my machine, i am not getting this error. I am able to locate the record.
[Code]...
when populating a data grid i keep getting a redundant row in the bottom. is there a way to lock grid rows to the number of rows in the data table?
View 1 Replies