pinvoke.net: Edit: advapi32.RegGetValue

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Summary: Retrieves the type and data for the specified registry value

!!!!C# Signature:
            /* Retrieves the type and data for the specified registry value. */
            [DllImport("Advapi32.dll", EntryPoint = "RegGetValueW", CharSet = CharSet.Unicode, SetLastError = true)]
            internal static extern LONG RegGetValue(
                SafeRegistryHandle hkey,
                string lpSubKey,
                string lpValue,
                EnumLib.RFlags dwFlags,
                out EnumLib.RType pdwType,
                IntPtr pvData,
                ref DWORD pcbData);

/* Retrieves the type and data for the specified registry value. */
            [DllImport("Advapi32.dll", EntryPoint = "RegGetValueW", CharSet = CharSet.Unicode, SetLastError = true)]
            internal static extern LONG RegGetValue(
                EnumLib.HKEY hkey,
                string lpSubKey,
                string lpValue,
                EnumLib.RFlags dwFlags,
                out EnumLib.RType pdwType,
                IntPtr pvData,
                ref DWORD pcbData);
!!!!VB Signature:
 Declare Function RegGetValue Lib "advapi32.dll" (TODO) As TODO
!!!!User-Defined Types:
        /// <summary>
        /// http://msdn.microsoft.com/en-us/library/windows/desktop/ms724884(v=vs.85).aspx
        /// </summary>
        internal enum RFlags
        {
            /// <summary>
            /// Any
            /// </summary>
            Any = 65535,

/// <summary>
            /// No defined value type.
            /// </summary>
            RegNone = 1,

/// <summary>
            /// ???
            /// </summary>
            Noexpand = 268435456,

/// <summary>
            /// Bytes
            /// </summary>
            RegBinary = 8,
            
            /// <summary>
            /// Int32
            /// </summary>
            Dword = 24,

/// <summary>
            /// Int32
            /// </summary>
            RegDword = 16,
            
            /// <summary>
            /// Int64
            /// </summary>
            Qword = 72,

/// <summary>
            /// Int64
            /// </summary>
            RegQword = 64,

/// <summary>
            /// A null-terminated string.
            /// This will be either a Unicode or an ANSI string,
            /// depending on whether you use the Unicode or ANSI functions.
            /// </summary>
            RegSz = 2,
            
            /// <summary>
            /// A sequence of null-terminated strings, terminated by an empty string (\0).
            /// The following is an example:
            /// String1\0String2\0String3\0LastString\0\0
            /// The first \0 terminates the first string, the second to the last \0 terminates the last string, 
            /// and the final \0 terminates the sequence. Note that the final terminator must be factored into the length of the string.
            /// </summary>
            RegMultiSz = 32,

/// <summary>
            /// A null-terminated string that contains unexpanded references to environment variables (for example, "%PATH%").
            /// It will be a Unicode or ANSI string depending on whether you use the Unicode or ANSI functions. 
            /// To expand the environment variable references, use the ExpandEnvironmentStrings function.
            /// </summary>
            RegExpandSz = 4,
            
            RrfZeroonfailure = 536870912
        }

/// <summary>
        /// http://msdn.microsoft.com/en-us/library/windows/desktop/ms724884(v=vs.85).aspx
        /// </summary>
        internal enum RType
        {
            RegNone= 0,
            
            RegSz = 1,
            RegExpandSz = 2,
            RegMultiSz = 7,

RegBinary = 3,
            RegDword = 4,
            RegQword = 11,

RegQwordLittleEndian = 11,
            RegDwordLittleEndian = 4,
            RegDwordBigEndian = 5,

RegLink = 6,
            RegResourceList = 8,
            RegFullResourceDescriptor = 9,
            RegResourceRequirementsList = 10,
        }

!!!!Notes:
Requires Windows Server 2003 SP1

!!!!Tips & Tricks:
Please add some!

!!!!Sample Code:
            uint pcbData = 0;
            EnumLib.RType type;
            var pvData = IntPtr.Zero;

Api.advapi32.RegGetValue(
                EnumLib.HKEY.HKEY_CURRENT_USER,
                @"Software\LG Electronics\LG PC Suite IV\1.0", @"DS_URL", 
                EnumLib.RFlags.Any,
                out type, pvData, ref pcbData);
            
            pvData = pvData.Reallocate(pcbData);
            Api.advapi32.RegGetValue(
                EnumLib.HKEY.HKEY_CURRENT_USER,
                @"Software\LG Electronics\LG PC Suite IV\1.0", @"DS_URL",
                type.ToFlag(),
                out type, pvData, ref pcbData);

if (type == EnumLib.RType.RegSz)
                Console.WriteLine(pvData.ToUnicodeStr());

!!!!Alternative Managed API:

Microsoft.Win32.Registry.GetValue()

Documentation: RegGetValue@msdn on MSDN