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//------------------------------------------------------------------------------
// <copyright file="PropertyInfoSet.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
// <owner current="true" primary="false">Microsoft</owner>
//------------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Diagnostics;
using System.Globalization;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Security;
using System.Security.Permissions;
using System.Threading;
using System.Runtime.ConstrainedExecution;
namespace System.Data.OleDb {
sealed internal class OleDbPropertyInfo {
public Guid _propertySet;
public Int32 _propertyID;
public string _description;
public string _lowercase;
public Type _type;
public int _flags;
public int _vtype;
public object _supportedValues;
public object _defaultValue;
}
internal sealed class PropertyInfoSet : SafeHandle {
private int setCount;
private IntPtr descBuffer;
internal PropertyInfoSet(UnsafeNativeMethods.IDBProperties idbProperties, PropertyIDSet propIDSet) : base(IntPtr.Zero, true) {
OleDbHResult hr;
int propIDSetCount = propIDSet.Count; // avoid need for ReliabilityContract on get_Count
Bid.Trace("<oledb.IDBProperties.GetPropertyInfo|API|OLEDB>\n");
RuntimeHelpers.PrepareConstrainedRegions();
try {} finally {
hr = idbProperties.GetPropertyInfo(propIDSetCount, propIDSet, out this.setCount, out base.handle, out this.descBuffer);
}
Bid.Trace("<oledb.IDBProperties.GetPropertyInfo|API|OLEDB|RET> %08X{HRESULT}\n", hr);
if ((0 <= hr) && (ADP.PtrZero != handle)) {
SafeNativeMethods.Wrapper.ClearErrorInfo();
}
}
public override bool IsInvalid {
get {
return ((IntPtr.Zero == base.handle) && (IntPtr.Zero == this.descBuffer));
}
}
internal Dictionary<string,OleDbPropertyInfo> GetValues() {
Dictionary<string,OleDbPropertyInfo> propertyLookup = null;
bool mustRelease = false;
RuntimeHelpers.PrepareConstrainedRegions();
try {
DangerousAddRef(ref mustRelease);
if (ADP.PtrZero != this.handle) {
propertyLookup = new Dictionary<string,OleDbPropertyInfo>(StringComparer.OrdinalIgnoreCase);
IntPtr setPtr = this.handle;
tagDBPROPINFO propinfo = new tagDBPROPINFO();
tagDBPROPINFOSET propinfoset = new tagDBPROPINFOSET();
for (int i = 0; i < setCount; ++i, setPtr = ADP.IntPtrOffset(setPtr, ODB.SizeOf_tagDBPROPINFOSET)) {
Marshal.PtrToStructure(setPtr, propinfoset);
int infoCount = propinfoset.cPropertyInfos;
IntPtr infoPtr = propinfoset.rgPropertyInfos;
for(int k = 0; k < infoCount; ++k, infoPtr = ADP.IntPtrOffset(infoPtr, ODB.SizeOf_tagDBPROPINFO)) {
Marshal.PtrToStructure(infoPtr, propinfo);
OleDbPropertyInfo propertyInfo = new OleDbPropertyInfo();
propertyInfo._propertySet = propinfoset.guidPropertySet;
propertyInfo._propertyID = propinfo.dwPropertyID;
propertyInfo._flags = propinfo.dwFlags;
propertyInfo._vtype = propinfo.vtType;
propertyInfo._supportedValues = propinfo.vValue;
propertyInfo._description = propinfo.pwszDescription;
propertyInfo._lowercase = propinfo.pwszDescription.ToLower(CultureInfo.InvariantCulture);
propertyInfo._type = PropertyInfoSet.FromVtType(propinfo.vtType);
if (Bid.AdvancedOn) {
Bid.Trace("<oledb.struct.OleDbPropertyInfo|INFO|ADV> \n");//, propertyInfo);
}
propertyLookup[propertyInfo._lowercase] = propertyInfo;
}
}
}
}
finally {
if (mustRelease) {
DangerousRelease();
}
}
return propertyLookup;
}
override protected bool ReleaseHandle() {
// NOTE: The SafeHandle class guarantees this will be called exactly once and is non-interrutible.
IntPtr ptr = base.handle;
base.handle = IntPtr.Zero;
if (IntPtr.Zero != ptr) {
int count = this.setCount;
for (int i = 0; i < count; ++i) {
int offset = (i * ODB.SizeOf_tagDBPROPINFOSET);
IntPtr infoPtr = Marshal.ReadIntPtr(ptr, offset);
if (IntPtr.Zero != infoPtr) {
int infoCount = Marshal.ReadInt32(ptr, offset + ADP.PtrSize);
for (int k = 0; k < infoCount; ++k) {
IntPtr valuePtr = ADP.IntPtrOffset(infoPtr, (k * ODB.SizeOf_tagDBPROPINFO) + ODB.OffsetOf_tagDBPROPINFO_Value);
SafeNativeMethods.VariantClear(valuePtr);
}
SafeNativeMethods.CoTaskMemFree(infoPtr); // was allocated by provider
}
}
SafeNativeMethods.CoTaskMemFree(ptr);
}
ptr = this.descBuffer;
this.descBuffer = IntPtr.Zero;
if (IntPtr.Zero != ptr) {
SafeNativeMethods.CoTaskMemFree(ptr);
}
return true;
}
internal static Type FromVtType(int vartype) {
switch((VarEnum)vartype) {
case VarEnum.VT_EMPTY: return null;
case VarEnum.VT_NULL: return typeof(System.DBNull);
case VarEnum.VT_I2: return typeof(System.Int16);
case VarEnum.VT_I4: return typeof(System.Int32);
case VarEnum.VT_R4: return typeof(System.Single);
case VarEnum.VT_R8: return typeof(System.Double);
case VarEnum.VT_CY: return typeof(System.Decimal);
case VarEnum.VT_DATE: return typeof(System.DateTime);
case VarEnum.VT_BSTR: return typeof(System.String);
case VarEnum.VT_DISPATCH: return typeof(System.Object);
case VarEnum.VT_ERROR: return typeof(System.Int32);
case VarEnum.VT_BOOL: return typeof(System.Boolean);
case VarEnum.VT_VARIANT: return typeof(System.Object);
case VarEnum.VT_UNKNOWN: return typeof(System.Object);
case VarEnum.VT_DECIMAL: return typeof(System.Decimal);
case VarEnum.VT_I1: return typeof(System.SByte);
case VarEnum.VT_UI1: return typeof(System.Byte);
case VarEnum.VT_UI2: return typeof(System.UInt16);
case VarEnum.VT_UI4: return typeof(System.UInt32);
case VarEnum.VT_I8: return typeof(System.Int64);
case VarEnum.VT_UI8: return typeof(System.UInt64);
case VarEnum.VT_INT: return typeof(System.Int32);
case VarEnum.VT_UINT: return typeof(System.UInt32);
default: return typeof(System.Object);
}
} }
}
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