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regcreatekeyex (coredll)

coredll is for smart devices, not desktop Windows. Therefore, this information only applies to code using the .NET Compact Framework. To see if information for regcreatekeyex in other DLLs exists, click on Find References to the right.

Creates the specified key. If the key already exists in the registry, it is opened.

C# Signature:

public static extern int RegCreateKeyEx(
   UIntPtr hKey, string lpSubKey, uint dwReserved, string lpClass,
   uint dwOptions, int samDesired, IntPtr lpSecurityAttributes,
   out IntPtr phkResult, out RegistryDispositionValue lpdwDisposition);

User-Defined Types:

enum RegistryDispositionValue : uint
   REG_CREATED_NEW_KEY     = 0x00000001,


The .NET Compact Framework does not contain a HandleRef type, so it may be necessary to call GC.KeepAlive after calling this function if the calling class wraps the hKey parameter as an unmanaged resource.

Tips & Tricks:


public UIntPtr HKEY_CLASSES_ROOT = (UIntPtr)0x80000000;
public const int REG_OPTION_NON_VOLATILE = 0;
int iResult;
IntPtr ipKey = IntPtr.Zero;
string strRegKeyPath;
int iDisposition;

iResult = RegCreateKeyEx(HKEY_CLASSES_ROOT, strRegKeyPath, 0,
   null, REG_OPTION_NON_VOLATILE, 0, IntPtr.Zero, out ipKey,
   out iDisposition);

// Z.F.Zeynal

public enum RootRegKeys : uint
        HKEY_CLASSES_ROOT = 0x8000000,
        HKEY_CURRENT_USER = 0x80000001,
        HKEY_LOCAL_MACHINE = 0x80000002,
        HKEY_USERS = 0x80000003

    public enum RegValueTypes
        REG_DWORD = 4,
        REG_SZ = 1
private uint CreateKey(RootRegKeys rrk, string Path)
            uint nKey = 0;
            uint nDisposition =0;
            int rez = RegCreateKeyEx ((uint) rrk,Path,0,String.Empty,0,0,0,ref nKey,ref nDisposition);
            if (rez != 0) throw new Exception ("Can't create key");
            return nKey; //Key handle

Alternative Managed API:

CF V2.0

Microsoft.Win32.Registry.LocalMachine.CreateSubKey(SubKey as string)


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