I want to create a registry key in local machine hive in windows 7. I used the following code in order to do so:
RegistryKey regKey = Registry.LocalMachine.CreateSubKey(#"Software\Test", RegistryKeyPermissionCheck.ReadWriteSubTree);
the code runs fine without any error. but when I looked at my registy using regedit.exe I don't see the key that i've just created. can anyone help me please.
regards
Are you on a 64 bit machine?
If you are on a 64 bit machine, check your project Build settings (Project Properties > Build tab) and check the Platform target.
If the Platform target is set to x86, and you are on a 64 bit machine the key will be created under the 'Wow6432Node'
In regedit.exe look in HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node and you should see your key there.
Change the Platform target to Any CPU and it will create the key in HKEY_LOCAL_MACHINE\SOFTWARE
In all likelihood your application is running without a manifest and is writing to the virtualized copy of HKLM. To test my theory, right click your exe and choose Run As Administrator. If it then writes to the correct area, this is what is happening.
If this is the issue, either change your mind about writing to HKLM (users don't like UAC prompts) or put a manifest on the exe that has requireAdministrator so that it will always request elevation and work properly.
What is the length of your key name? There is a known bug in regedit that wont let you see keys with names longer than 256 characters.
Related
My application installs some dynamic libraries in the {app} folder with uninsrestartdelete flag set upon installation. After uninstallation, these locked files are all written to the registry key PendingFileRenameOperations correctly. But on some Windows 10 machines, Windows just fails to delete these files and registry values on the next reboot. I have no idea what's going wrong. Even the OS itself doesn't have enough privileges to delete these files? Thanks!
Not really sure of my exact question, but here is the situation:
I have an application (WinForms, C# .Net) that I am developing in Visual Studio 2012. It does a lot of things but the important bit is that it needs to read files from a certain location.
In this case, the location of the files is on a server and my machine has a mapped network drive setup for accessing the files. I can manually navigate to the files with Windows Explorer fine.
I have the following line in my code which is highlighting the issue:
System.IO.File.Exists("X:\\A Folder\\a_file.txt");
And that file does exist in that location. However this is where the problem occurs: if I build the solution and run the .exe directly from the "bin" folder (double-click). The code is fine, and it finds the file. But if I run it with visual studio then I get a "file not found" exception.
I am putting this down to the fact that Visual Studio is running in "Administrator" mode (I forget why I needed this, but I do). Now this makes sense if you consider that the "administrator" account does not have the "X:\" drive mapped. However, this has never been a problem until I upgraded to Windows 10 last week.
So my question is:
Does Visual Studio Administrator mode work differently in Windows 10? In this case, does it handle mapped network drives differently?
It's worth noting I upgraded from Windows 7, so I cannot confirm if this issue is also present in 8 and 8.1 or not.
And before anyone asks, let's just say it has to be a mapped drive. No UNC paths allowed!
So I have found a solution/workaround. Kind of seems like a wasted bounty now, so if someone has other suggestions that are better then please post and I will review them and award as applicable. Or even if somebody can make a more detailed version of my solution then I will award that one.
The issue is probably not specific to Visual Studio, but would occur with any application running with elevated privileges. Anyway, the solution I found is to add a registry key that enables the same shared drives to be accessible when running in administrator mode.
The registry key location is:
HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Policies/System
And the key to add is called:
EnableLinkedConnections
And should be created as a DWORD with a value of 1 (0x00000001)
I checked with the machines running Windows 7 and they do NOT have this key, yet they still work fine. So I expect this isn't the only solution, but it does seem to work (no side effects noted yet). I would assume that Windows 10 has a specific setting somewhere that by default prevents mapped drives from automatically being available with "run as administrator".
For reference, I found this information here.
In fact, here is a more "official" recommendation for using this reg key.
This is unlikely to have anything to do with Windows 10, just with the configuration of your machine. What you describe is normal and covered by this KB article. Nothing I can check for myself so just try the recommended workarounds, follow up at superuser.com if necessary.
Different users/system tasks maybe running. As such, you have the X drive mapped, but others do not. You could do the drive mapping on additional users on your Windows installation as well. As you stated, this should not be a Windows 10 only issue, but also Windows 7+ and elevated privileges.
Maybe you could use a configured parameter for the X: path and load at runtime, or even try using UNC paths which will resolve at runtime and not need the drive to be mapped.
\\ServerNameOrIP\A Folder\a_file.txt.
In the code, you would need:
System.IO.File.Exists("\\\\ServerName\\A Folder\\a_file.txt");
I have created a small vb6 application which edits the registry in HKLM hive. It makes use of function RegSetValueEx. But when run the exe file in windows 7 and windows 8 pc it does not edit the registry even if run it in administrator user.
In windows XP it works fine.If i run same application as "run as administrator"(by right clicking exe and then run as) in windows 7 and 8 then it works properly.I think the windows 7 and 8 id designed to work like this only. But is there any method i can edit it without running as administrator? Or is there any code in vb6 which does the same.
Here is my small code
Important:
When checking the code create exe and then run the exe and click on button(HKEY_LOCAL_MACHINE\SOFTWARE\Demo registry gets added in wow32 node because vb6 is a 32 bit appliaction).Running the code directly by opening code allows the registry to change.But creating the exe and then running it gives the problem which is the real time scenario in any application.
Microsoft has been warning developers since Windows 2000 that access to the HKLM branch of the registry should not be performed as normal user, as it will sooner or later be restricted to administrators. They also said you should not write to Program Files.
They didn't enforce that rule until Windows Vista, so nobody felt the need to change anything.
Now you have it: don't write to HKLM as normal user - it doesn't work. Don't write your settings to Program Files. It doesn't work.
Application run by the normal user may write their data to user folders and user hives in the registry, nowhere else.
If your application's sole purpose is to write to that value in the HKLM hive then you will need to add a "requiresAdministrator` manifest to the executable, causing Windows to prompt the user for admin access every time it's run.
If this is a small part of a larger project, then you should use COM elevation or just run a small stub executable with the manifest above, allowing windows to only prompt when it's required.
If your application doesn't require admin access at all then you should stop it trying to write to admin restricted locations, and instead use the user's own HKCU hive.
We have an application that stores its database files in a subfolder of the Program Files directory. These files are redirected to the VirtualStore in Vista and Windows 7. We represent data from the database using Microsoft DataReports (VB6). So far so good.
But we now want to use Crystal Reports XI to represent data from the database. Our idea is to NOT pass this data to CR from our program, but to have CR retreive it from the database using a a system DSN through ODBC. In this way we hope to present our users with more flexibility in designing their own reports. What we do want to ensure though is that these system DSNs are configured correctly when the user installs our program or when the program calls the Crystal Report.
Is there a smart way to do this using System variables for instance, instead of having to write a routine that checks for OS-version, whether UAC is enabled on the OS, whether the write restrictions on the Program Files folder have been lifted, etc and then adapts he System DSN to point to either the C:\Program Files\OurApp\Data folder, or the C:\Users\User\AppData\VirtualStore\Program Files\OurApp\Data folder?
Suggestions for an entirely different approach are welcome too!
New applications should have an application manifest that specifies requestedExecutionLevel. This declares your program "Vista aware" and bypasses attempts at virtualization.
During installation you should create a folder like [CommonAppData]\Company\App\Full and set security on this folder to allow Full Access by Everyone (or by Users). Put your database into this folder.
For an MDB you can drop the database right here. For a client/server database put a UDL file here. Also see Use Universal Data Link (.udl) Files.
ODBC and DSNs are pretty obsolete technologies.
Using the suggested approaches should work for almost anything but the oldest Win95 computer.
Is this an Access database? You haven't specified.
For an Access database, you don't need to point your DSN to a specific database when you install it. You can modify the connection string to point to different databases at runtime (details). For instance
Driver={Microsoft Access Driver (*.mdb)};Dbq=C:\mydatabase.mdb;Uid=Admin;Pwd=;
Can you simply read the installation path at runtime (in VB6 it is App.Path) and then send a different connection string to Crystal Reports?
It seems that Virtual Store takes care of everything, so you can point the DSN blatantly at C:\Program Files\MyApp\Data\mydb.mdb even while the database has been relocated to the Virtual Store.
Current Version
You might want to detect the current-version of Windows the system is running.
This will in turn help You in determining the correct PATH.
How to find windows version, build and revision numbers??
Read the the Registry keys –
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\CurrentBuildNumber
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\CurrentVersion
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\EditionID
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\ProductId
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\BuildLabEx
The CurrentBuildNumber is your Windows Build Number. Then CurrentVersion value is your windows version i.e. the version of your windows 7, windows vista, windows xp, etc. EditionID and ProductId to know the windows-edition and product-id.
The key BuildLabEx contains build number and revision number.
For example, in the value 6001.17387.x86fre.vistasp1_gdr.070927-1921:
the first four digits stand for build number i.e. 6001 and
the next five digits stand for windows revision number i.e. 17387.
x86 tells you that you are running a 32-bit operating system.
You might also be interested in this:
How to detect true Windows version?
GoodLUCK!!
In Visual Basic 6, when I attempt to access Project > References, it throws an error:
Error accessing system registry
I am:
Logged in as the local computer administrator
running Windows XP Professional and
I can execute regedt32.exe and access all the registry keys just fine.
VB6 was installed as the local administrator.
Any idea why this happens?
I'm running crystal reports 8.5 and it supposed to already have fixed that issue but apparently I still have the issue with 8.5 installed. I have also made the attempt of reinstalling crystal reports with no luck on the issue.
Depending on the Windows OS you have (I have Windows 7 Enterprise), you might want to try giving administrator rights to the REGTLIB.EXE (located in C:\Windws). Right click on the REGTLIB.EXE file. Select Properties from the pop-up menu. Then select the Compatiblity tab. On the Compatiblity tab, check/select the Run this program as Administrator checkbox. Click OK to save your changes. It might take take care of the problem for you. It worked for me. Good luck.
For me this worked:
goto C:\Program Files\Microsoft Visual Studio\VB98
change the property of VB6.EXE by right click->Compatibility In privilege level section, check the option Run this program as Administrator
If you're running Office 2010 (Beta) Word (apparently) writes a restricted registry key. VB throws the error when scanning the registry. The key I have is:
HKCR\TypeLib\{00020905-0000-0000-C000-000000000046}\8.5
For Regmon - Filter for Process Name -> "vb6.exe" and Result -> ACCESS DENIED. Helps find it very quickly.
Fixed it with PSToosl (PSEXEC) to run registry editor. The command line is,
psexec -i -d -s c:\windows\regedit.exe
psexec needs to be run with elevated-permissions.
Edit by Jim: I'm on a Windows 7 (x64) box. Elevated permissions require the PSTools solution. XP can get away with a little less.
You could try Process Monitor to see which registry keys are accessed.
I got this on a machine that I was using for VB6 development. I had been building a lot of COM DLLs from VB6 (without binary compatibility) and the cruft that had built up in the registry eventually got too much.
Have a look at what size the registry is and what limit you have set. I doubled the registry size and then went looking for a good registry hoover.
Here is a solution from Microsoft. It references the Crystal Reports problem, but the solution just uses regedit32 to walk the HKEY_CLASSES_ROOT\TypeLib and HKEY_CLASSES_ROOT\CLSID registry branches for dimmed keys and correcting the security on those keys. There are also instructions to fix the security if regedit32 is unable to access the key. Article ID: 269383
In Windows 7 go to start menu then right click "Microsoft Visual Basic 6" then select properties and click Compatibility from the dialog box that appears then tick "Run this program as an administrator".
Have you tried this? Basically, it seems that it is a crystal reports issue. Hope that helps.
Perhaps worth a try going to the "User Account Control Settings".
Regards,
When I installed VB6 on Win7-64 (using instructions easily found by a search engine), it worked fine. UAC was off -- i.e. set to "never notify."
After a few weeks I turned UAC on -- i.e. set it to its default. VB6 then couldn't compile because of the "Error accessing the system registry" problem. Unfortunately, turning it off again didn't help. Apparently the damage done by turning it on was irreversible. I can't explain why this should be, but that's my experience.
Giving REGTLIB.EXE administrative privileges while leaving UAC off sounded like a great idea, but that didn't work for me either.
Finally, using Process Monitor and PsTools as described in other posts here worked. However, I had to give Full Control to large parts of my registry to Everyone. This didn't apply just to isolated keys. It seems that the compiler needs to add keys to major nodes, so I had to open up these entire nodes.
Aside from the fact that working through these steps took hours, I'm now much more exposed than I was before I tried to increase security via UAC, However, I need VB6 and don't see another solution short of a new computer.
Lesson: Don't use UAC with VB6. Except if you've arrived here it's too late for that.
It's VB6 installation issue. Try to re-intall VB6 on your system. Otherwise open "visual studio 6.0" with "Run as Administrator". Then open/browse your project .vbp file via - New Project -> Existing tab.
I have fixed the problem. But none of the suggestion above worked. What I did is giving everyone full control over the SYSTEM key in the registry. This creats a security break. I am running 64bit Windows 7 with vb6 serice pack 6B.
I'm running Windows 10 Pro (10.0.16299 Build 16299) 64 bit. I was having this error when trying to compile a VB6 DLL.
I saw several answers in this post about running in compatibility mode as administrator. I thought I would first try just running in compatibility mode for Windows XP (sp2). I was able to compile my DLL after checking that box. I didn't need to run as administrator.