VS 2005 : Are Permissions Required For AllocHGlobal
Feb 23, 2010
I have a program that uses a font that's not stored on many computers, so the font comes with the program, in its resources. Before I was writing to a file and loading the font from that location, but I remember now that sometimes you don't have permission to write to a file. My application will not write to any other files, and having this font available is very important. So, I decided to use Marshal.AllocHGlobal() to store the font in memory, then read it back. (I'm using a PrivateFontCollection object to store these fonts.)Does Marshal.AllocHGlobal() require permissions? Is it more likely that it will throw an exception than IO.File.WriteAllBytes()?
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May 3, 2010
does any body have the link for the offline installer of vb2005
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Apr 12, 2010
Now i'm working with users so for each user there are many permissions like add, update, view and delete, but i was thinking create a bit type data for each authorization, then i would load each one with 0 or 1 and show only the authorized form for the user. Could I do this? or there a better way to do the same?
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Jan 31, 2009
My problem is that i want to be able to set permissions for users as they log into our software. When the program loads the users get the logon screen. Then once authenticated (in SQL)they can access all of the forms. What i want to know is can i create some sort of access levels. So for example if i was to login to the software as admin then i can see the "system" menu whereas if i login as someone else they cant see the menu. Can it be done in SQL, like my authentication. Even if we added an extra column called access then if it was set to 0 you are an admin and if it is set to 1 you are standard.
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Aug 21, 2009
I have resorted to using the Win32 API calls VirtualAlloc/VirtualFree to allocate and release memory blocks greater than 2GB in size.
I should be able to use the AllocHGlobal function from the System.Runtime.InteropServices.Marshal class to do the same.
However, the following code gives an arithmetic overflow exception (note the explicit cast to long which should instance a 64 bit pointer).
Dim p As IntPtr = System.Runtime.InteropServices.Marshal.AllocHGlobal(New IntPtr(CLng(3221225472)))
System.Runtime.InteropServices.Marshal.FreeHGlobal(p)
So my question is, Can I use AllocHGlobal to allocate more than 2GB of memory?
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May 22, 2009
I have an app written on an xp pc which I want users to run on Vista
The app needs to delete a file on a portable drive in a particular folder
This folder was created on the xp machine and copied to the portable drive
The app will not delete a file in this folder on Vista but it will on xp
When I check folder security on vista (which does not exist on xp) I find that the folder does not have full control assigned
my app will write a file to that folder & delete it but will not delete a file put there from the xp pc
If I change the security in vista to full control it works
what I want to do is see if the folder has full control when the user selects it and advise them they need to alter security as I can not do it in the program
basically I want to advise them the moment they select the folder, not when it fails to delete the file after entering misc details in the app which are reuired before the file is deleted.
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Jul 8, 2010
I'm working with a vb.net 2005 project that i converted from vb 6.0 last year. It's working fine in windows xp, but on vista and windows 7 i get an error saying 'Insufficient security permissions to set the system time.' Can you think of any way to replicate this error on windows xp? I'm trying to get a windows 7 box setup at work but I was wondering if there was anything I could try with xp in the meantime.
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Mar 30, 2009
Im currently working on mendhak ADO.net tutorial and I keep getting this error when trying to add a new customer to the database.Load Event
[code]...
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Feb 9, 2010
I am using a form which is having a listbox having a column of access table. When I select an item n press deleting it its working fine. But from the next time its showing an error "No value given for one or more required parameters".
Refer the ecode below:
Private Sub load_listbox()
Dim m_DataAdapter As OleDbDataAdapter
Dim m_DataSet As New DataSet()
Dim tbl_name As String = "Fld_detail_" & Datamaker.Application_Datamaker_ListBox.SelectedItem
m_DataAdapter = New OleDbDataAdapter("SELECT Start_loc FROM(" & tbl_name & ");",
[Code] .....
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Sep 3, 2010
I am trying to returns records based on the last name of a customer in an access db. When I run the query in Access it works fine, the name in the examples returns 3 records with that last name. I use the same basic structure for other queries based on other fields (ID, UnitID etc) and they work fine.
[Code]...
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Sep 11, 2010
I am working on my project as I am create a if statement that if there is no string in the textbox, displaying the messagebox otherwisse connect to the proxy server.[code]My problem is that how can I check if the proxy server is required for username and password, in which property that I should use in the if statement and how I can response it?
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Jun 8, 2009
making an application for thumb recognition in vb.net 2005 as soon as possible.
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Jan 7, 2010
In an app that is deployed to a diverse user base, I have code similar to the following: [code] For all users but one or two, this is fine. But one user is reporting back that he is receiving this error message:"The remote server returned an error: (407) Proxy Authentication Required."
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Jun 5, 2010
I need to get file size of some files, which i can get very easily by using FileInfo class.. As of now, I'm looping through all files in My Directory and then taking their file sized into a notepad.But the real problem for me is,Like this, I'm having around 100 Root directories, each contains ~ 1000 subdirectories and each sub directory contains ~ 80 files..Yes, I know, that, I can use a recursive function and loop through all dirs and sub dirs and thus the files.. which was taking huge efforts in terms of time.I want to know, If there was any other alternative, which will make my task more easier and efficient.
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Jul 3, 2009
I am trying to execute a command line EXE (busobj.exe) with required parameters through VB.Net. Because of unknown reason the report is not being generated. Here's the commandline:
Shell(txtBOExecutable.Text & _
" -user " & txtUserName.Text & _
" -pass " & txtPassword.Text & _
" -system " & txtDomain.Text & _
[code].....
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Apr 8, 2011
I have a class set up to hold values on a registration form (VB.NET, MVC), and among the properties is a Password property:
[Code]...
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Jun 14, 2011
I didn't think it fair to post a comment on Fredrik Mörk's answer in this 2 year old post, so I thought I'd just ask it as a new question instead..NB: This is not a critiscm of the answer in any way, I'm simply trying to understand this all before delving into memory management / the marshal class.
In that answer, the function GetByteArray allocates memory to each object within the given array, within a loop.Would the GetByteArray function on the aforementioned post have benefited at all from allocating memory for the total size of the provided array:
Dim arrayBufferPtr = Marshal.AllocHGlobal(Marshal.SizeOf(<arrayElement>) * <array>.Count)
I just wonder if allocating the memory, as shown in the answer, causes any kind of fragmentation? Assuming there may be fragmentation, would there be much of an impact to be concerned with? Would allocating the memory in the way I've shown force you to call IntPtr.ToInt## to obtain pointer offsets from the overall allocation pointer, and therefore force you to check the underlying architecture to ensure the correct method is used*1 or is there a better way? (ToInt32/ToInt64 depending on x86/64?)
*1 I read elsewhere that calling the wrong IntPtr.ToInt## will cause overflow exceptions. What I mean by that statement is would I use:
Dim anOffsetPtr As New IntPtr(arrayBufferPtr.ToInt## + (loopIndex * <arrayElementSize>))
I've read through a few articles on the VB.Net Marshal class and memory allocation; listed below, but if you know fo any other good articles I'm all ears![URL]..
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Jul 18, 2011
Does vb 2010 have a 'REQUIRED" property or control that allow you to make a textbox a "required" field? I googled and saw something about required property in controls in toolbox but somehow I could not find it anywhere in my vb 2010 toolbox. Would it be easier to write it? Does anyone have sample code?
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Dec 24, 2010
I need to create a directory with the permissions restricted to all users but only the program can modify in it. I want the program to create new files and write text in this texts files, but nobody should see or modify the content of this files and even better if nobody could see either inside the directory itself.
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Sep 17, 2009
I created a Project, now i wanna publish it. I should copy a folder from the CD on C:ProgramsTest .... Now my problem, how can i put the permission on it:
For all Folders and Subfolders should be: Group: User Permission:
Change -- true
Read -- true
Write -- true
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Jun 15, 2008
I have a small application that creates users in the AD. It adds the users fine, and creates them a home directory. My problem is with granting the user permission to the home directory and is two foldFirstly the code detailed below adds the user to the folder, but because the account is newly created it displays as the SID rather than the name, not such a big deal, but sometimes the code fails as the replication has not caught up and the user isnt found. I beleive the answer here is to use the SID rather than the users name to add permissions, however I am not sure how to retrieve and store this when the account is created using directory services. Secondly and more frustrating is that once the user is added to the folder ACL their permissions are all blank.
Try
Dim Dinfo As New DirectoryInfo(Directory)
Dim DS As DirectorySecurity = New DirectorySecurity()
Dim Rights As FileSystemRightsFileSystemRights = FileSystemRights.Modify
[Code]....
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Feb 8, 2007
I have been working on creating a small application we can run that will add permissions to a folder during an installation of a new application. The application requires read/write access to the folder and all subfolders. For whatever reason I have been instructed to include this in and install package that will be pushed out using SMS. Below is a sample of the method I use to add the user to the folder and give the appropriate rights to that user:
[Code]...
This works fine adding the user account to the folder and with with appropriate rights. I need it to give rights to the folder I select and all subfolders and files, This is where I am stuck. Does anyone know how to grant permission to a selected directory and all subfolders and files?
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May 18, 2009
With Vista we are having a permission denied error when an application tries to change properties of a file in Program Data folder... before replacing with a newer version of the file.Changing of security permissions for a standard user is not an option. Is there a way we can grant the premissions for an application developed in VB .net to give permission only to change properties of this file.
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Mar 14, 2012
If default 'sa' account has sys_admin permissions for the whole SQL instance and all its databases. On the database itself, if I don't have db_datareader permission enabled, I would assume it doesn't need it as it is implied but I was wondering in .net, is there way to check if db_datareader has explicitly been enabled and not just implied from the 'sa' being a sys_admin.
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Apr 22, 2010
I would like to SET ALL permissions to True for all users of a computer, while using Directory.CreateDirectory
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Aug 25, 2009
I have a project that I am testing with Windows 7, its almost complete but doesnt function without elevating the users permissions, I've tried a few of the sample codes I've found online and they don't seem to work... This has been tested on a admin account, but still requires elevated privaliges... I believe becuase it directly effects critical and non-critical windows services (starting, stopping, retreiving the status, enabling or disabling them)
[Code]...
I understand the UAC could be used to implement this "admin only" restriction, but as I havent even tried using the UAC Settings area yet. As I said, a link to helpful content would be cool, an example would be great.Running Visual Studio 2005 under a Visual Basic Environment.
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Jan 15, 2009
I'm trying to put together a simple "file search" app that lets the user specify where to look, what type of files to look for, what the minimum file size is, etc. (I know...sounds kinda like capabilities that already exist in Windows!). I'm running into "access" issues, even with directories that I wouldn't think I should have any trouble accessing.I'm doing something like this:
Dim f As New FileIOPermission(PermissionState.Unrestricted)
f.AllLocalFiles = FileIOPermissionAccess.Read
Try
[code].....
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May 4, 2012
I am trying to change the permisions of the following registry key from within VB.net:-HKEY_LOCAL_MACHINESOFTWAREMicrosoftMSLicensing.Basically need to change users to full control (rather than the default of read)Have read through forum, and replies to a previous post I made (n.b. have started a new one as that post covered various things and was getting a bit convulted) and lots of links but still cannot work out how to do it, please can someone help me further?
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Jun 4, 2009
I'm getting the hang of most controls now, still a lot to learn (and I mean a LOT) but I'm thinking how about all the windows stuff how does one learn all that for example how to change the background how to control settings permissions etc...Is there a book on it? What is Shell Programming?
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Dec 29, 2009
I am exploring ways of implementing access control permissions in a VB 2008 Windows Application.This is an application for a non-profit where users would log in and depending on their group membership (ie. warehouse, accounting, etc.) some forms would be available while others are not. (eg Warehouse cannot view donor info) Additionally some groups can view information but not alter (add, delete, edit) information.groups who are denied permissions would not be able to open certain windows forms. The question is what is an efficient method of creating this permission structure and how would it be implemented in the application?
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