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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Runtime / InteropServices / Variant.cs / 1305376 / Variant.cs
/* **************************************************************************** * * Copyright (c) Microsoft Corporation. * * This source code is subject to terms and conditions of the Microsoft Public License. A * copy of the license can be found in the License.html file at the root of this distribution. If * you cannot locate the Microsoft Public License, please send an email to * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound * by the terms of the Microsoft Public License. * * You must not remove this notice, or any other, from this software. * * * ***************************************************************************/ namespace System.Runtime.InteropServices { using System.Diagnostics; ////// Variant is the basic COM type for late-binding. It can contain any other COM data type. /// This type definition precisely matches the unmanaged data layout so that the struct can be passed /// to and from COM calls. /// [StructLayout(LayoutKind.Explicit)] [System.Security.SecurityCritical] internal struct Variant { #if DEBUG static Variant() { // Variant size is the size of 4 pointers (16 bytes) on a 32-bit processor, // and 3 pointers (24 bytes) on a 64-bit processor. int variantSize = Marshal.SizeOf(typeof(Variant)); if (IntPtr.Size == 4) { BCLDebug.Assert(variantSize == (4 * IntPtr.Size), "variant"); } else { BCLDebug.Assert(IntPtr.Size == 8, "variant"); BCLDebug.Assert(variantSize == (3 * IntPtr.Size), "variant"); } } #endif // Most of the data types in the Variant are carried in _typeUnion [FieldOffset(0)] private TypeUnion _typeUnion; // Decimal is the largest data type and it needs to use the space that is normally unused in TypeUnion._wReserved1, etc. // Hence, it is declared to completely overlap with TypeUnion. A Decimal does not use the first two bytes, and so // TypeUnion._vt can still be used to encode the type. [FieldOffset(0)] private Decimal _decimal; [StructLayout(LayoutKind.Sequential)] private struct TypeUnion { internal ushort _vt; internal ushort _wReserved1; internal ushort _wReserved2; internal ushort _wReserved3; internal UnionTypes _unionTypes; } [StructLayout(LayoutKind.Sequential)] private struct Record { private IntPtr _record; private IntPtr _recordInfo; } [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1049:TypesThatOwnNativeResourcesShouldBeDisposable")] [StructLayout(LayoutKind.Explicit)] private struct UnionTypes { #region Generated Variant union types // *** BEGIN GENERATED CODE *** // generated by function: gen_UnionTypes from: generate_comdispatch.py [FieldOffset(0)] internal SByte _i1; [FieldOffset(0)] internal Int16 _i2; [FieldOffset(0)] internal Int32 _i4; [FieldOffset(0)] internal Int64 _i8; [FieldOffset(0)] internal Byte _ui1; [FieldOffset(0)] internal UInt16 _ui2; [FieldOffset(0)] internal UInt32 _ui4; [FieldOffset(0)] internal UInt64 _ui8; [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2006:UseSafeHandleToEncapsulateNativeResources")] [FieldOffset(0)] internal IntPtr _int; [FieldOffset(0)] internal UIntPtr _uint; [FieldOffset(0)] internal Int32 _bool; [FieldOffset(0)] internal Int32 _error; [FieldOffset(0)] internal Single _r4; [FieldOffset(0)] internal Double _r8; [FieldOffset(0)] internal Int64 _cy; [FieldOffset(0)] internal double _date; [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2006:UseSafeHandleToEncapsulateNativeResources")] [FieldOffset(0)] internal IntPtr _bstr; [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2006:UseSafeHandleToEncapsulateNativeResources")] [FieldOffset(0)] internal IntPtr _unknown; [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2006:UseSafeHandleToEncapsulateNativeResources")] [FieldOffset(0)] internal IntPtr _dispatch; // *** END GENERATED CODE *** #endregion [FieldOffset(0)] internal IntPtr _byref; [FieldOffset(0)] internal Record _record; } ////// Primitive types are the basic COM types. It includes valuetypes like ints, but also reference types /// like BStrs. It does not include composite types like arrays and user-defined COM types (IUnknown/IDispatch). /// internal static bool IsPrimitiveType(VarEnum varEnum) { switch(varEnum) { #region Generated Variant IsPrimitiveType // *** BEGIN GENERATED CODE *** // generated by function: gen_IsPrimitiveType from: generate_comdispatch.py case VarEnum.VT_I1: case VarEnum.VT_I2: case VarEnum.VT_I4: case VarEnum.VT_I8: case VarEnum.VT_UI1: case VarEnum.VT_UI2: case VarEnum.VT_UI4: case VarEnum.VT_UI8: case VarEnum.VT_INT: case VarEnum.VT_UINT: case VarEnum.VT_BOOL: case VarEnum.VT_R4: case VarEnum.VT_R8: case VarEnum.VT_DECIMAL: case VarEnum.VT_DATE: case VarEnum.VT_BSTR: // *** END GENERATED CODE *** #endregion return true; } return false; } unsafe public void CopyFromIndirect(object value) { VarEnum vt = (VarEnum)(((int)this.VariantType) & ~((int)VarEnum.VT_BYREF)); if (value == null) { if (vt == VarEnum.VT_DISPATCH || vt == VarEnum.VT_UNKNOWN || vt == VarEnum.VT_BSTR) { *(IntPtr*)this._typeUnion._unionTypes._byref = IntPtr.Zero; } return; } switch (vt) { case VarEnum.VT_I1: *(sbyte*)this._typeUnion._unionTypes._byref = (sbyte)value; break; case VarEnum.VT_UI1: *(byte*)this._typeUnion._unionTypes._byref = (byte)value; break; case VarEnum.VT_I2: *(short*)this._typeUnion._unionTypes._byref = (short)value; break; case VarEnum.VT_UI2: *(ushort*)this._typeUnion._unionTypes._byref = (ushort)value; break; case VarEnum.VT_BOOL: *(short*)this._typeUnion._unionTypes._byref = (bool)value ? (short)-1 : (short)0; break; case VarEnum.VT_I4: case VarEnum.VT_INT: *(int*)this._typeUnion._unionTypes._byref = (int)value; break; case VarEnum.VT_UI4: case VarEnum.VT_UINT: *(uint*)this._typeUnion._unionTypes._byref = (uint)value; break; case VarEnum.VT_ERROR: *(int*)this._typeUnion._unionTypes._byref = ((ErrorWrapper)value).ErrorCode; break; case VarEnum.VT_I8: *(Int64*)this._typeUnion._unionTypes._byref = (Int64)value; break; case VarEnum.VT_UI8: *(UInt64*)this._typeUnion._unionTypes._byref = (UInt64)value; break; case VarEnum.VT_R4: *(float*)this._typeUnion._unionTypes._byref = (float)value; break; case VarEnum.VT_R8: *(double*)this._typeUnion._unionTypes._byref = (double)value; break; case VarEnum.VT_DATE: *(double*)this._typeUnion._unionTypes._byref = ((DateTime)value).ToOADate(); break; case VarEnum.VT_UNKNOWN: *(IntPtr*)this._typeUnion._unionTypes._byref = Marshal.GetIUnknownForObject(value); break; case VarEnum.VT_DISPATCH: *(IntPtr*)this._typeUnion._unionTypes._byref = Marshal.GetIDispatchForObject(value); break; case VarEnum.VT_BSTR: *(IntPtr*)this._typeUnion._unionTypes._byref = Marshal.StringToBSTR((string)value); break; case VarEnum.VT_CY: *(long*)this._typeUnion._unionTypes._byref = decimal.ToOACurrency((decimal)value); break; case VarEnum.VT_DECIMAL: *(decimal*)this._typeUnion._unionTypes._byref = (decimal)value; break; default: throw new ArgumentException("invalid argument type"); } } ////// Get the managed object representing the Variant. /// ///public object ToObject() { // Check the simple case upfront if (IsEmpty) { return null; } switch (VariantType) { case VarEnum.VT_NULL: return DBNull.Value; #region Generated Variant ToObject // *** BEGIN GENERATED CODE *** // generated by function: gen_ToObject from: generate_comdispatch.py case VarEnum.VT_I1: return AsI1; case VarEnum.VT_I2: return AsI2; case VarEnum.VT_I4: return AsI4; case VarEnum.VT_I8: return AsI8; case VarEnum.VT_UI1: return AsUi1; case VarEnum.VT_UI2: return AsUi2; case VarEnum.VT_UI4: return AsUi4; case VarEnum.VT_UI8: return AsUi8; case VarEnum.VT_INT: return AsInt; case VarEnum.VT_UINT: return AsUint; case VarEnum.VT_BOOL: return AsBool; case VarEnum.VT_ERROR: return AsError; case VarEnum.VT_R4: return AsR4; case VarEnum.VT_R8: return AsR8; case VarEnum.VT_DECIMAL: return AsDecimal; case VarEnum.VT_CY: return AsCy; case VarEnum.VT_DATE: return AsDate; case VarEnum.VT_BSTR: return AsBstr; case VarEnum.VT_UNKNOWN: return AsUnknown; case VarEnum.VT_DISPATCH: return AsDispatch; // *** END GENERATED CODE *** #endregion default: try { unsafe { fixed (void* pThis = &this) { return Marshal.GetObjectForNativeVariant((System.IntPtr)pThis); } } } catch (Exception ex) { throw new NotImplementedException("Variant.ToObject cannot handle" + VariantType, ex); } } } /// /// Release any unmanaged memory associated with the Variant /// ///public void Clear() { // We do not need to call OLE32's VariantClear for primitive types or ByRefs // to safe ourselves the cost of interop transition. // ByRef indicates the memory is not owned by the VARIANT itself while // primitive types do not have any resources to free up. // Hence, only safearrays, BSTRs, interfaces and user types are // handled differently. VarEnum vt = VariantType; if ((vt & VarEnum.VT_BYREF) != 0) { VariantType = VarEnum.VT_EMPTY; } else if ( ((vt & VarEnum.VT_ARRAY) != 0) || ((vt) == VarEnum.VT_BSTR) || ((vt) == VarEnum.VT_UNKNOWN) || ((vt) == VarEnum.VT_DISPATCH) || ((vt) == VarEnum.VT_VARIANT) || ((vt) == VarEnum.VT_RECORD) ) { unsafe { fixed (void* pThis = &this) { NativeMethods.VariantClear((IntPtr)pThis); } } BCLDebug.Assert(IsEmpty, "variant"); } else { VariantType = VarEnum.VT_EMPTY; } } public VarEnum VariantType { get { return (VarEnum)_typeUnion._vt; } set { _typeUnion._vt = (ushort)value; } } internal bool IsEmpty { get { return _typeUnion._vt == ((ushort)VarEnum.VT_EMPTY); } } internal bool IsByRef { get { return (_typeUnion._vt & ((ushort)VarEnum.VT_BYREF)) != 0; } } [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly")] // public void SetAsNULL() { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_NULL; } #region Generated Variant accessors // *** BEGIN GENERATED CODE *** // generated by function: gen_accessors from: generate_comdispatch.py // VT_I1 public SByte AsI1 { get { BCLDebug.Assert(VariantType == VarEnum.VT_I1, "variant"); return _typeUnion._unionTypes._i1; } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_I1; _typeUnion._unionTypes._i1 = value; } } // VT_I2 public Int16 AsI2 { get { BCLDebug.Assert(VariantType == VarEnum.VT_I2, "variant"); return _typeUnion._unionTypes._i2; } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_I2; _typeUnion._unionTypes._i2 = value; } } // VT_I4 public Int32 AsI4 { get { BCLDebug.Assert(VariantType == VarEnum.VT_I4, "variant"); return _typeUnion._unionTypes._i4; } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_I4; _typeUnion._unionTypes._i4 = value; } } // VT_I8 public Int64 AsI8 { get { BCLDebug.Assert(VariantType == VarEnum.VT_I8, "variant"); return _typeUnion._unionTypes._i8; } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_I8; _typeUnion._unionTypes._i8 = value; } } // VT_UI1 public Byte AsUi1 { get { BCLDebug.Assert(VariantType == VarEnum.VT_UI1, "variant"); return _typeUnion._unionTypes._ui1; } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_UI1; _typeUnion._unionTypes._ui1 = value; } } // VT_UI2 public UInt16 AsUi2 { get { BCLDebug.Assert(VariantType == VarEnum.VT_UI2, "variant"); return _typeUnion._unionTypes._ui2; } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_UI2; _typeUnion._unionTypes._ui2 = value; } } // VT_UI4 public UInt32 AsUi4 { get { BCLDebug.Assert(VariantType == VarEnum.VT_UI4, "variant"); return _typeUnion._unionTypes._ui4; } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_UI4; _typeUnion._unionTypes._ui4 = value; } } // VT_UI8 public UInt64 AsUi8 { get { BCLDebug.Assert(VariantType == VarEnum.VT_UI8, "variant"); return _typeUnion._unionTypes._ui8; } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_UI8; _typeUnion._unionTypes._ui8 = value; } } // VT_INT public IntPtr AsInt { get { BCLDebug.Assert(VariantType == VarEnum.VT_INT, "variant"); return _typeUnion._unionTypes._int; } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_INT; _typeUnion._unionTypes._int = value; } } // VT_UINT public UIntPtr AsUint { get { BCLDebug.Assert(VariantType == VarEnum.VT_UINT, "variant"); return _typeUnion._unionTypes._uint; } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_UINT; _typeUnion._unionTypes._uint = value; } } // VT_BOOL public bool AsBool { get { BCLDebug.Assert(VariantType == VarEnum.VT_BOOL, "variant"); return _typeUnion._unionTypes._bool != 0; } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_BOOL; _typeUnion._unionTypes._bool = value ? -1 : 0; } } // VT_ERROR public Int32 AsError { get { BCLDebug.Assert(VariantType == VarEnum.VT_ERROR, "variant"); return _typeUnion._unionTypes._error; } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_ERROR; _typeUnion._unionTypes._error = value; } } // VT_R4 public Single AsR4 { get { BCLDebug.Assert(VariantType == VarEnum.VT_R4, "variant"); return _typeUnion._unionTypes._r4; } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_R4; _typeUnion._unionTypes._r4 = value; } } // VT_R8 public Double AsR8 { get { BCLDebug.Assert(VariantType == VarEnum.VT_R8, "variant"); return _typeUnion._unionTypes._r8; } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_R8; _typeUnion._unionTypes._r8 = value; } } // VT_DECIMAL public Decimal AsDecimal { get { BCLDebug.Assert(VariantType == VarEnum.VT_DECIMAL, "variant"); // The first byte of Decimal is unused, but usually set to 0 Variant v = this; v._typeUnion._vt = 0; return v._decimal; } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_DECIMAL; _decimal = value; // _vt overlaps with _decimal, and should be set after setting _decimal _typeUnion._vt = (ushort)VarEnum.VT_DECIMAL; } } // VT_CY public Decimal AsCy { get { BCLDebug.Assert(VariantType == VarEnum.VT_CY, "variant"); return Decimal.FromOACurrency(_typeUnion._unionTypes._cy); } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_CY; _typeUnion._unionTypes._cy = Decimal.ToOACurrency(value); } } // VT_DATE public DateTime AsDate { get { BCLDebug.Assert(VariantType == VarEnum.VT_DATE, "variant"); return DateTime.FromOADate(_typeUnion._unionTypes._date); } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_DATE; _typeUnion._unionTypes._date = value.ToOADate(); } } // VT_BSTR public String AsBstr { get { BCLDebug.Assert(VariantType == VarEnum.VT_BSTR, "variant"); return (string)Marshal.PtrToStringBSTR(this._typeUnion._unionTypes._bstr); } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_BSTR; this._typeUnion._unionTypes._bstr = Marshal.StringToBSTR(value); } } // VT_UNKNOWN public Object AsUnknown { get { BCLDebug.Assert(VariantType == VarEnum.VT_UNKNOWN, "variant"); if (_typeUnion._unionTypes._unknown == IntPtr.Zero) return null; return Marshal.GetObjectForIUnknown(_typeUnion._unionTypes._unknown); } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_UNKNOWN; if (value == null) _typeUnion._unionTypes._unknown = IntPtr.Zero; else _typeUnion._unionTypes._unknown = Marshal.GetIUnknownForObject(value); } } // VT_DISPATCH public Object AsDispatch { get { BCLDebug.Assert(VariantType == VarEnum.VT_DISPATCH, "variant"); if (_typeUnion._unionTypes._dispatch == IntPtr.Zero) return null; return Marshal.GetObjectForIUnknown(_typeUnion._unionTypes._dispatch); } set { BCLDebug.Assert(IsEmpty, "variant"); // The setter can only be called once as VariantClear might be needed otherwise VariantType = VarEnum.VT_DISPATCH; if (value == null) _typeUnion._unionTypes._dispatch = IntPtr.Zero; else _typeUnion._unionTypes._dispatch = Marshal.GetIDispatchForObject(value); } } // *** END GENERATED CODE *** #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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