Local Storage System For Relative Large Information
Nov 10, 2011
I've been reading a lot of articles here and there, really, for the past two days, searching for a good local storage system. I have no immediate use for now, so I am just exploring my choices. By saying 'local storage system,' I'm talking about some sort of database used for applications that let users manage and organize personal accounts (bank accounts, web site accounts, application licenses...). I do use XML to store user settings. But if you have to manage lots of information locally, XML won't probably be good enough, I'm afraid.
So what are choices Visua Basic users? Well, as I often mention, I develop Mac software products. And I use SQLite. In fact, every one of some 40 apps sold at Mac App Store uses SQLite for good reasons. I know that you can use SQLite with Visual Studio after installing a package from sqlite.phxsoftware.com. But I don't know if your application can reproduce a database file when necessary. That being said, I'm looking for a system that I can use to create a file programmatically especially when the user launches it for the first time. So what do you use to locally manage large information? SQL Express? SQLite? XML?
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Aug 3, 2010
I recently changed a For Each loop to a Parallel.ForEach loop. I'm concerned about an object being declared outside the loop but assigned while iterating in the loop. Here is the simplified code.
Dim results As ModelResults
Dim noResultsModel As New List(Of ModelResults)
Dim lock As New Object
Parallel.ForEach(_modelEngines,
Sub(model)
[Code]...
Is there a potential race condition with the results object? Would anything be different if I moved the declaration of results into the for loop?
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Mar 22, 2009
I need a simple method for a user to enter as many rows of data as they wish (probably won't exceed 50 in most cases and that's pushing it) and then store that data for retrieving the next time they want to reuse that list. I will also need to read the rows in for manipulating text in a file with those entries.
Would the best method to be to use the DataSet in VB Express 2008 and then use the DataGridView for allowing the display and entry of the data?
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Jan 6, 2012
I want to resize the resolution of an image before uploading it to local storage. Right now it saves the image in its full resolution and I have to manually resize it using width="200" height="200" or a css tag in aspx. I want to reduce the file size of an image before storing it, hence by resizing the image resolution when the user uploads it via button. I've tried using System.Drawing before and setting the int imageHeight and int maxWidth to be resized but couldn't seem to get it to work.
My code so far is:
Protected Sub btn_SavePic_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btn_SavePic.Click
Dim newFileName As String
Dim SqlString As String
[Code] .....
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Apr 8, 2010
I need some input how to storage some information.The information I wish to store is a list (1-300) that contains the following:
-Raw material (string)
-An array of Value (double or long)
-An array of Date (string preferably)
My first approach to this was looking at the structure statement but I couldnt figure how to use the array within the structure statement.
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Oct 7, 2011
I'm making an installer that needs to have information stored inside the exe itself.I cannot use my.settings because it is stored outside the application and if it is changed and the exe is moved to another computer it will reset to default.
And I cannot use resources since I cannot add/edit resources after the application is build.
Is there any way I can store and change info even if the application is moved to another location?
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Jan 23, 2009
I'm downloading a bunch of files from a URI but when they get big, I get an utOfMemoryException. I thought at first it was MemoryStream error but I'm pretty sure now that the error is rooted in the declaration of an array of Bytes that's too large. (Half a gig is fine, 1.7 gig is not.)
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Oct 22, 2010
[Code]...
(Attempting managed execution inside OS Loader lock. Do not attempt to run managed code inside a DllMain or image initialization function since doing so can cause the application to hang .) in this code. Could anybody tell me, why I have System.outofmemory exception when i release arrays? There is no exception while large arrays exist so why after their realesing??
[Code]...
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Sep 21, 2009
i am trying to add a mpg file to resources. at the time of compiling it throws following exception.the size of file is 200mb. [code]how is it possible to add a large size file to exe resources?
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May 26, 2010
We are in the final stages of releasing a new in-house written system within our company. We have opted to create a single system/project containing multiple programs (like a mini ERP system).We are stuck on the navigation mechanism which will allow the user to load the appropriate forms. I am personally not a fan of the Tree View control because I think it is unfriendly to users. I have been looking on the web for some inspiration and I am interested in the design of the OPEN BRAVO ERP system. Before we dive in though, I wanted to get other programmers opinions. What do you find works best in VB 2008?
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Aug 4, 2010
I am Developing a application in that i am returning the ipaddress for the patricular system and save it in the database.but when check the database it is showing the server ip address but i want get the particular ip address who is running that application.[code]...
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Aug 27, 2011
Possible Duplicate:How to get local ip address using vb?I am using Silverlight3 with VB.NET. I have written the follwing code in my service file. When I run my project locally, it gives the IP address of my system as 192.168.1.12 successfully. But, when I host my project it wont return the IP adress of the system which I am usingie: If i host my project in system A which is of ip 192.168.1.12 and if I access the project from system B which is of ip 192.168.1.7, the output of my project will gives the IP of system A (where i have hosted my project). It should give the IP of system B where am running it. Similarly, if am accessing the project from system C means it should give the IP of system
Private Function fnLocalIp() As String
Try
Dim h As System.Net.IPHostEntry = System.Net.Dns.GetHostByName(System.Net.Dns.GetHostName)
[code].....
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Mar 26, 2010
Trying to insert 315K Gif files into an Oracle 10g database. Everytime I get this error "ora-01460: unimplemented or unreasonable conversion requested" whe I run the stored procedure. It appears that there is a 32K limit if I use a stored procedure. I read online that this does not apply if you are doing a direct insert, but I do not know how to create the insert string for a Byte Array. This is a thick client running on the server so not worried about SQL Injection attacks.
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Apr 14, 2010
I want to Ignore System Protected Folders Using My code.i already try Catch ex As UnauthorizedAccessExceptionor
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Feb 16, 2010
I have a Windows service running on Local System Account. The service connects to a remote webservice, and donwloads a file.Now I installed the service in an environment with a proxy server (http://proxy:80"). The result is that in the eventlog I get error:"unable to connect to remote server". When I start the service with a (test) account, everything works fine.Can someone tell me how I can handle a proxy environment with a service running under local system account?
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Apr 15, 2011
I've a service running under Windows Server 2008R2. I'm using the system.IO to do some copying & deletion of files and directories.This is working fine as long the service is using an user account. If I set the selection to 'Local system account' then it is not possible anymore to delete or copy files.
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May 2, 2011
I have developed an ASP.Net 2.0 application and I am facing problem in sending email from my Web Server. Following is the VB code I have used to send email from my web application. Thing is when I try to send email from my local system (laptop) the email goes out fine and reaches the recipient address instantly but when I try to send email from my web server it fails.My hosting provider gave me a relay-host address for sending out email. The email goes out fine but the relay host has an annoying amount of delay in email delivery which is a problem during the sign up process.
Here is the code I am using:I have imported system.net.mail in my code and used async="true" on the aspx page.
Private Sub SendMail(ByVal actcd As String)
Dim mailMessage As New System.Net.Mail.MailMessage
mailMessage.From = New MailAddress(support@ihomejobs.com)
[code]....
I have tried the above settings and they work fine from outlook and the application when tried on my laptop but these settings fail on web server.I want to send email from my web server without using a relay-host.
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May 1, 2012
Set objService = objWMIService.Get("Win32_BaseService")
objService.Create("usb2", "usb test", "c:usb2.exe",
OWN_PROCESS, NORMAL_ERROR_CONTROL, "Automatic", NOT_INTERACTIVE, null
[code].....
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Oct 5, 2006
I want to change or reset the local admin password of the opreataing system(win xp) using vb.netIs it possible?
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May 14, 2011
I am trying to create a data entry system for a local community group. I am working with VB.NET 2010 and MSAcess 2000. I am completely new to using a DB in VB.Net. I have created a form with the membership table bound as details on the form and the classes they are attending as a DataGridView. I used all the Visual Studio GUI tools for this. It was reasonably straightforward once I got the hang of things. My problems arise when I try to ensure that a user cannot move to a new record or create a new member without first saving any changes they have made.
I am using ColumnChanging events in the ...DataSet.vb class to set flags to indicate whether any data values have been changed on the form. My problem is that the ColumnChanging events for the classes DGV fire immediately on changing the data whereas the ones for the member details don't fire until I start to move to a new record. I don't know if it is important but my member navigation is achieved by means of a combobox on the form that lists the member names from the table. I have absolutely no idea why this works - it just did; the form updates as soon as the user selects a new member in the combo box.
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May 30, 2011
I'm developing application in VB.NET 2008. Here i have Mask Text Box with mask "0000/00/00" (i,e yyyy/mm/dd ).
but when i change the system date separator to "-" in control panel then all mask control is taking 'yyyy-mm-dd'.
I don't want to change mask text box date format based on local system setting. Always this should accept only yyyy/mm/dd .
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Feb 20, 2010
My final goal is that striking F12 prints the date (through SendKeys) in the application/window having currently the focus (Word, Excel, Outlook, whatever). I have consequently implemented a globak keyboard hook (system-wide), which is running well (source code below).
My concern is that I would like to prevent any other local treatment based on F12. For instance, striking F12 under Microsotft Word prints the date is the open document (which is fine!) but also launches the "Save as..." dialog box, since F12 is a local shortcut/keybinding under Word. (Actually, the date is printed within a field of a the "Save as..." dialog box). I want to avoid this.
In other words, my aim is to improve the "hook" below so that striking F12 does what I want (which is already the case) but nothing more. That is to say, I would like that, except my treatment, the system "forgets" that F12 was striken.
' Option Strict On
Option Explicit On
' inspired by:
' http://jo0ls-dotnet-stuff.blogspot.com/2008/12/vbnet-global-keyboard-hook-to-detect.html
[code]....
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Aug 19, 2009
An Error has occurred while establishing a connection to the server. When Connecting to a SQL Server2005, this failure may be caused by the fact that under the default settings SQL server doesn allow remote connection (provider: Named Pipe Provider, error: 40- Could not open a connection to SQL Server)I want to connect to the SQL Server 2005 Express Edition which is running on my system from a VB.NET application. I am using Visual Basic 2008 Express Edition. Here is the Coding,
Dim sqlConn As SqlClient.SqlConnection
sqlConn = New SqlClient.SqlConnection("server=localhost" & "initial catalog=LIB")
Try
[code].....
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Aug 3, 2010
The following steps give a Guest shutdown policy.
1- Click run, and type the gpedit.msc, to start "Local Group Policy Editor".
2 -Expand "Computer Configuration" -> "Windows Settings" -> "Security Settings" -> "Local Policies" -> Then click "User Rights Assignment".
3- In the Policy window, Select "Force shutdown from a remote system", double click it, it will pop a properties window.
4- Click "Add user or group button", add a user and name it Guest.
I need to know if it's possible to manipulate and add the user or group programmatically. I'm using Visual Basic 2008.
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Aug 19, 2009
I want to send a image to server side using HTTPService,I am using ASP.NET for server side coding. I don't know how to write server side code to receive the image sent as a byteArray, and I am also not sure if my client side code is correct or not。is there any IT PRO..[code]I could not get the image in my disk,I think the flex side should have not problem, but the VB code side should be something wrong.
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May 27, 2009
I want to know how to connect to a remote system having some shared folder.(ex, \myservermysharedfolder).Actually, I was supposed to copy a particular file which is available in a shared location of a system. To copy that file, first i need to connect to that system with an user id and password.I know copying of file (), But not getting clear idea on how to connect to the shared folder. I have tried with System.Management class, but no use..
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Aug 15, 2010
The original code came from AutoItI just rewrote what was necessary for VB.NET and added the structures and throws. If successful the PID of the process started is returned, else an exception is thrown. No imports needed.
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Jun 24, 2010
I'd like to know the way to get information about the Operating System (windows Xp or Windows 7) and the bit information(32 bit or 64 bit). [code]In the above code, if verInfo.Minor is 1 , then it should be Xp, but I am getting 1 for both Windows Xp and Windows 7.Is there any other way to determine the OS and the bit(32 or 64 bit) used?
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Feb 29, 2012
I remember seeing somewhere on the net that there are classes in .Net that will return information about your computer. I know that System.Environment returns some of this information like MachineName and some other stuff. Are there other classes that will return information such as hard drive size, free and used space, total memory, used memory?
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Jul 21, 2011
I've been assigned to do some report analysis in a management information system.My question is, do you think it's a efficient way to gather datas from SQL, with the use of basic syntax and have them manipulated through my code in VB.NET?(I'm more skilled with this kind of execution, but it takes a lot of data calling from the database)Or should I just do the advance way of inner jointing or more likely a stored procedure?
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