@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: The GetThreadSelectorEntry API !!!!C# Signature: [DllImport( "kernel32.dll", SetLastError = true )] static extern bool GetThreadSelectorEntry ( IntPtr hThread, uint dwSelector, out LDT_ENTRY lpSelectorEntry ); !!!!User-Defined Types: !!!!C# Signature: struct BYTES { public byte BaseMid; public byte Flags1; public byte Flags2; public byte BaseHi; } struct BITS { int Value; /// <summary> /// Max set value is 255 (11111111b) /// </summary> public int BaseMid { get { return ( Value & 0xFF ); } set { Value = ( Value & unchecked( (int)0xFFFFFF00 ) ) | ( value & 0xFF ); } } /// <summary> /// Max set value is 31 (11111b) /// </summary> public int Type { get { return ( Value & 0x1F00 ) >> 8; } set { Value = ( Value & unchecked( (int)0xFFFFE0FF ) ) | ( ( value & 0x1F ) << 8 ); } } /// <summary> /// Max set value is 3 (11b) /// </summary> public int Dpl { get { return ( Value & 0x6000 ) >> 13; } set { Value = ( Value & unchecked( (int)0xFFFF9FFF ) ) | ( ( value & 0x3 ) << 13 ); } } /// <summary> /// Max set value is 1 (1b) /// </summary> public int Pres { get { return ( Value & 0x4000 ) >> 15; } set { Value = ( Value & unchecked( (int)0xFFFFBFFF ) ) | ( ( value & 0x1 ) << 15 ); } } /// <summary> /// Max set value is 15 (1111b) /// </summary> public int LimitHi { get { return ( Value & 0xF0000 ) >> 16; } set { Value = ( Value & unchecked( (int)0xFFF0FFFF ) ) | ( ( value & 0xF ) << 16 ); } } /// <summary> /// Max set value is 1 (1b) /// </summary> public int Sys { get { return ( Value & 0x100000 ) >> 20; } set { Value = ( Value & unchecked( (int)0xFFEFFFFF ) ) | ( ( value & 0x1 ) << 20 ); } } /// <summary> /// Max set value is 1 (1b) /// </summary> public int Reserved_0 { get { return ( Value & 0x200000 ) >> 21; } set { Value = ( Value & unchecked( (int)0xFFDFFFFF ) ) | ( ( value & 0x1 ) << 21 ); } } /// <summary> /// Max set value is 1 (1b) /// </summary> public int Default_Big { get { return ( Value & 0x400000 ) >> 22; } set { Value = ( Value & unchecked( (int)0xFFBFFFFF ) ) | ( ( value & 0x1 ) << 22 ); } } /// <summary> /// Max set value is 1 (1b) /// </summary> public int Granularity { get { return ( Value & 0x800000 ) >> 23; } set { Value = ( Value & unchecked( (int)0xFF7FFFFF ) ) | ( ( value & 0x1 ) << 23 ); } } /// <summary> /// Max set value is 255 (11111111b) /// </summary> public int BaseHi { get { return ( Value & unchecked( (int)0xFF000000 ) ) >> 24; } set { Value = ( Value & unchecked( (int)0xFFFFFF ) ) | ( ( value & 0xFF ) << 24 ); } } } [StructLayout( LayoutKind.Explicit )] struct HIGHWORD { [FieldOffset( 0 )] public BYTES Bytes; [FieldOffset( 0 )] public BITS Bits; } struct LDT_ENTRY { public ushort LimitLow; public ushort BaseLow; public HIGHWORD HighWord; } !!!!Notes: None. !!!!Tips & Tricks: Please add some! !!!!Sample Code: !!!!C# Signature: var cntx = new CONTEXT(); LDT_ENTRY ldt; cntx.ContextFlags = CONTEXT_ALL; if ( !GetThreadContext( GetCurrentThread(), ref cntx ) ) throw new Exception(); if ( !GetThreadSelectorEntry( GetCurrentThread(), cntx.SegDs, out ldt ) ) throw new Exception(); !!!!Alternative Managed API: Do you know one? Please contribute it! Documentation: GetThreadSelectorEntry@msdn on MSDN
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