The requested registry access is not allowed # 2
I recently wrote an application that needs access to the following registry key:
HKLM \ SOFTWARE \ Wow6432Node \ Classes \ CLSID
For some odd reason, I am not allowed to access this key on whatever system I have tested on. I am using administrative rights and everything in between to try and accomplish this. I was browsing the first 5 pages of google results and it was still blank.
Notes:
1. Keys that I can delete may or may not contain subsections, I thoroughly tested "DeleteSubKey" and "DeleteSubKeyTree".
2. I tried OpenSubKey ("Key", True) and both false and true values still denied me access.
3. I am also not allowed to access the non-64-bit location (HKLM \ Software \ Classes \ CLSID).
4. I tested this on XP, 7 and 8. XP gave me no problem.
5. The exact error I am getting is below:
The requested registry access is denied. at Microsoft.Win32.RegistryKey.OpenSubKey (rowname, boolean entry)
PLEASE help me ... it killed me in a few days. Any help is appreciated.
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Microsoft.Win32.RegistryKey m_RegEntry = Microsoft.Win32.Registry.LocalMachine;
m_RegEntry = m_RegEntry.OpenSubKey(@"SYSTEM\CurrentControlSet\Control\Class\{4D36E96D-E325-11CE-BFC1-08002BE10318}");
//string
int i = 0;
string[] m_szModemEntries = m_RegEntry.GetSubKeyNames();
This brings many connected devices back to the COM port. and a "Properties" entry that we don't need to access.
below I am attaching a simple code to work with it.
string[] m_szModem;
Microsoft.Win32.RegistryKey m_RegEntry = Microsoft.Win32.Registry.LocalMachine;
m_RegEntry = m_RegEntry.OpenSubKey(@"SYSTEM\CurrentControlSet\Control\Class\{4D36E96D-E325-11CE-BFC1-08002BE10318}");
//string
int i = 0;
string[] m_szModemEntries = m_RegEntry.GetSubKeyNames();
m_szModem = new string[m_szModemEntries.Length];
string m_szModemPort = null;
string m_szModemName = null;
foreach (string m_szModemEntry in m_szModemEntries)
{
if (!IsNumber(m_szModemEntry))
{
}
else
{
m_RegEntry.Close();
m_RegEntry = Microsoft.Win32.Registry.LocalMachine;
string m_szKeyName = @"SYSTEM\CurrentControlSet\Control\Class\{4D36E96D-E325-11CE-BFC1-08002BE10318}\" + m_szModemEntry;
m_RegEntry = m_RegEntry.OpenSubKey(m_szKeyName);
m_szModemPort = m_RegEntry.GetValue("AttachedTo").ToString();
m_szModemName = m_RegEntry.GetValue("Model").ToString();
if (m_szModemName.Contains("<device name>"))
{
CommPort = m_szModemPort;
lbldevicename.Text = "Device connected!";
lbldevicename.ForeColor = Color.Green;
cmdProgram.Enabled = true;
DeviceConnected = true;
break;
}
CommPort = "";
cmdProgram.Enabled = false;
lbldevicename.Text = "Device not connected!";
lbldevicename.ForeColor = Color.Red;
DeviceConnected = false;
}
}
// and the IsNumber function
public Boolean IsNumber(String s)
{
foreach (Char ch in s)
{
if (!Char.IsDigit(ch)) return false;
}
return true;
}
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You may need to change your access control protection. Use GetAccessControl to get the ACL for a registry key, modify it, and then save it with SetAccessControl .
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in vb.net you can use this to access the key before doing any operation on it.
x.GetAccessControl(System.Security.AccessControl.AccessControlSections.All)
where x is any reg. key
after looking at the code i tried this and it works
Dim r As Microsoft.Win32.RegistryKey = Microsoft.Win32.Registry.LocalMachine.OpenSubKey("SOFTWARE\test", Microsoft.Win32.RegistryKeyPermissionCheck.ReadWriteSubTree)
r.DeleteSubKey("subkey", True)
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