How to check a file from registry and get the file path using C#

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Hello,

I have C# application, i want to check tool which is registered or not in the registry. if the tool is registered i want to get the path and execute that exe in command prompt?

can anyone suggest me, How to do this?

Thanks.

What I have tried:

using (RegistryKey rk = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\PenMount Windows Universal Driver"))
             {
                 if (rk != null)
                 {
                     this.Logger.Error("PenMount exists");
                 }
                 else
                 {
                     this.Logger.Error("not exists");
                 }
             }

but rk is always getting null.

Posted 12-Sep-17 4:58am

sri durga

Updated 12-Sep-17 9:25am

v2

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Richard MacCutchan 12-Sep-17 11:16am

Have you looked in the Registry to see if the key exists, or checked the error code to find out why?

sri durga 12-Sep-17 11:26am

I checked for other softwares. its giving null even the key exists in the registry.

Richard MacCutchan 12-Sep-17 11:38am

Then you need to check the error code when it returns null.

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Richard Deeming · Accepted Answer · 2017-09-12T09:24:00

The most likely cause is that you're running a 32-bit application on a 64-bit OS:
c# - OpenSubKey() returns null for a registry key that I can see in regedit.exe - Stack Overflow[^]

By default, you'll be looking in HKLM\Software\Wow6432Node, thanks to the registry redirector:
Registry Redirector (Windows)[^]

Assuming you're using .NET 4.0 or later, you'll need to specify the registry view:

using (var hklm = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry64))
using (var key = hklm.OpenSubKey(@"SOFTWARE\PenMount Windows Universal Driver"))
{
   // key now points to the 64-bit key
}

If you're using an earlier version, you'll need some P/Invoke calls instead:
How to read the 64 bit registry from a 32 bit application or vice versa | Rhyous[^]