private static System.Type GetValueTypeFromTypeDesc(System.Windows.Forms.NativeMethods.tagTYPEDESC typeDesc, UnsafeNativeMethods.ITypeInfo typeInfo, object[] typeData, StructCache structCache) { IntPtr unionMember; int hr = 0; switch (((System.Windows.Forms.NativeMethods.tagVT) typeDesc.vt)) { case System.Windows.Forms.NativeMethods.tagVT.VT_DISPATCH: case System.Windows.Forms.NativeMethods.tagVT.VT_UNKNOWN: typeData[0] = GetGuidForTypeInfo(typeInfo, structCache, null); return VTToType((System.Windows.Forms.NativeMethods.tagVT) typeDesc.vt); case System.Windows.Forms.NativeMethods.tagVT.VT_PTR: { System.Windows.Forms.NativeMethods.tagTYPEDESC data = (System.Windows.Forms.NativeMethods.tagTYPEDESC) structCache.GetStruct(typeof(System.Windows.Forms.NativeMethods.tagTYPEDESC)); try { try { UnsafeNativeMethods.PtrToStructure(typeDesc.unionMember, data); } catch { data = new System.Windows.Forms.NativeMethods.tagTYPEDESC { unionMember = (IntPtr) Marshal.ReadInt32(typeDesc.unionMember), vt = Marshal.ReadInt16(typeDesc.unionMember, 4) }; } if (data.vt == 12) { return VTToType((System.Windows.Forms.NativeMethods.tagVT) data.vt); } unionMember = data.unionMember; } finally { structCache.ReleaseStruct(data); } break; } case System.Windows.Forms.NativeMethods.tagVT.VT_USERDEFINED: unionMember = typeDesc.unionMember; break; default: return VTToType((System.Windows.Forms.NativeMethods.tagVT) typeDesc.vt); } UnsafeNativeMethods.ITypeInfo pTypeInfo = null; hr = typeInfo.GetRefTypeInfo(unionMember, ref pTypeInfo); if (!System.Windows.Forms.NativeMethods.Succeeded(hr)) { throw new ExternalException(System.Windows.Forms.SR.GetString("TYPEINFOPROCESSORGetRefTypeInfoFailed", new object[] { hr }), hr); } try { if (pTypeInfo != null) { IntPtr zero = IntPtr.Zero; hr = pTypeInfo.GetTypeAttr(ref zero); if (!System.Windows.Forms.NativeMethods.Succeeded(hr)) { throw new ExternalException(System.Windows.Forms.SR.GetString("TYPEINFOPROCESSORGetTypeAttrFailed", new object[] { hr }), hr); } System.Windows.Forms.NativeMethods.tagTYPEATTR gtypeattr = (System.Windows.Forms.NativeMethods.tagTYPEATTR) structCache.GetStruct(typeof(System.Windows.Forms.NativeMethods.tagTYPEATTR)); UnsafeNativeMethods.PtrToStructure(zero, gtypeattr); try { Guid g = gtypeattr.guid; if (!Guid.Empty.Equals(g)) { typeData[0] = g; } switch (gtypeattr.typekind) { case 0: return ProcessTypeInfoEnum(pTypeInfo, structCache); case 3: case 5: return VTToType(System.Windows.Forms.NativeMethods.tagVT.VT_UNKNOWN); case 4: return VTToType(System.Windows.Forms.NativeMethods.tagVT.VT_DISPATCH); case 6: return GetValueTypeFromTypeDesc(gtypeattr.Get_tdescAlias(), pTypeInfo, typeData, structCache); } return null; } finally { pTypeInfo.ReleaseTypeAttr(zero); structCache.ReleaseStruct(gtypeattr); } } } finally { pTypeInfo = null; } return null; }