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RegConnectRegistry (advapi32)
Connect to a remote PC's registry

C# Signature:

  [DllImport("advapi32.dll", SetLastError = true)]
  static extern int RegConnectRegistry(string lpmachineName, int hKey, ref int phKResult);

VB Signature:

Declare Auto Function RegConnectRegistry Lib "Advapi32" ( _
   ByVal lpMachineName As String, _
   ByVal hKey As IntPtr, _
   ByRef phkResult As IntPtr _
) As Integer

User-Defined Types:


Alternative Managed API:



LONG RegConnectRegistry(
   LPCTSTR lpMachineName,
   HKEY hKey,
   PHKEY phkResult

Tips & Tricks:

Please add some!

VB Sample Code:

' static method
Public Shared Function OpenRemoteBaseKey(ByVal Hive As RegistryHive, ByVal RemotePC As String) As RegistryKey
   Dim ret As Integer
   Dim hRemoteKey As IntPtr

   ret = RegConnectRegistry("\\" & RemotePC, New IntPtr(Hive), hRemoteKey)
   If ret <> 0 Then
     Throw New Win32Exception(ret)
   End If

   Dim ans As New RegistryKey
   ans.IsRootHive = False
   ans.hKey = hRemoteKey
   Return ans
End Function

C# Sample Code:

private con;

public RemoteRegistryReader(string computerName)
    int iHKEY, iResult, iReturn;
    bool bOK = false;
    string sValue = string.Empty;

    iResult = ConnectToRemoteReg(@"\\" + computerName, HKEY_LOCAL_MACHINE, ref bOK);

    if (bOK)
        System.Windows.Forms.MessageBox.Show("+ Result:\t" + Convert.ToString(iResult));
        System.Windows.Forms.MessageBox.Show("- Result... ERROR!");

    con = sValue; //'0' connection exists

private int ConnectToRemoteReg(string computerName, int HKEY, ref bool bOK)
    int iReturn = 0;
    int iResult = 0;

    iReturn = RegConnectRegistry(computerName, HKEY, ref iResult);

    if (iReturn == 0)
        bOK = true;
        iReturn = iResult;
        bOK = false;

        return iReturn;


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