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COMDispatchHelpers.cs
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Runtime.InteropServices;
using DISPPARAMS = System.Runtime.InteropServices.ComTypes.DISPPARAMS;
using EXCEPINFO = System.Runtime.InteropServices.ComTypes.EXCEPINFO;
namespace Microsoft.ClearScript.Util
{
internal static class COMDispatchHelpers
{
public static object GetProperty(this IDispatchEx dispatchEx, string name, bool ignoreCase, object[] args)
{
int dispid;
Marshal.ThrowExceptionForHR(dispatchEx.GetDispID(name, ignoreCase ? DispatchNameFlags.CaseInsensitive : DispatchNameFlags.CaseSensitive, out dispid));
using (var argVariantArrayBlock = new CoTaskMemVariantArgsBlock(args))
{
using (var resultVariantBlock = new CoTaskMemVariantBlock())
{
EXCEPINFO excepInfo;
var dispArgs = new DISPPARAMS { cArgs = args.Length, rgvarg = argVariantArrayBlock.Addr, cNamedArgs = 0, rgdispidNamedArgs = IntPtr.Zero };
Marshal.ThrowExceptionForHR(dispatchEx.InvokeEx(dispid, 0, DispatchFlags.PropertyGet, ref dispArgs, resultVariantBlock.Addr, out excepInfo));
return Marshal.GetObjectForNativeVariant(resultVariantBlock.Addr);
}
}
}
public static void SetProperty(this IDispatchEx dispatchEx, string name, bool ignoreCase, object[] args)
{
if (args.Length < 1)
{
throw new ArgumentException("Invalid argument count", "args");
}
int dispid;
var result = dispatchEx.GetDispID(name, DispatchNameFlags.Ensure | (ignoreCase ? DispatchNameFlags.CaseInsensitive : DispatchNameFlags.CaseSensitive), out dispid);
if (result == RawCOMHelpers.HResult.DISP_E_UNKNOWNNAME)
{
throw new NotSupportedException("Object does not support dynamic properties");
}
Marshal.ThrowExceptionForHR(result);
using (var argVariantArrayBlock = new CoTaskMemVariantArgsBlock(args))
{
using (var namedArgDispidBlock = new CoTaskMemBlock(sizeof(int)))
{
EXCEPINFO excepInfo;
Marshal.WriteInt32(namedArgDispidBlock.Addr, SpecialDispIDs.PropertyPut);
var dispArgs = new DISPPARAMS { cArgs = args.Length, rgvarg = argVariantArrayBlock.Addr, cNamedArgs = 1, rgdispidNamedArgs = namedArgDispidBlock.Addr };
result = dispatchEx.InvokeEx(dispid, 0, DispatchFlags.PropertyPut | DispatchFlags.PropertyPutRef, ref dispArgs, IntPtr.Zero, out excepInfo);
if (result == RawCOMHelpers.HResult.DISP_E_MEMBERNOTFOUND)
{
// VBScript objects can be finicky about property-put dispatch flags
result = dispatchEx.InvokeEx(dispid, 0, DispatchFlags.PropertyPut, ref dispArgs, IntPtr.Zero, out excepInfo);
if (result == RawCOMHelpers.HResult.DISP_E_MEMBERNOTFOUND)
{
result = dispatchEx.InvokeEx(dispid, 0, DispatchFlags.PropertyPutRef, ref dispArgs, IntPtr.Zero, out excepInfo);
}
}
Marshal.ThrowExceptionForHR(result);
}
}
}
public static bool DeleteProperty(this IDispatchEx dispatchEx, string name, bool ignoreCase)
{
return dispatchEx.DeleteMemberByName(name, ignoreCase ? DispatchNameFlags.CaseInsensitive : DispatchNameFlags.CaseSensitive) == RawCOMHelpers.HResult.S_OK;
}
public static IEnumerable<string> GetPropertyNames(this IDispatchEx dispatchEx)
{
int dispid;
var result = dispatchEx.GetNextDispID(DispatchEnumFlags.All, SpecialDispIDs.StartEnum, out dispid);
while (result == RawCOMHelpers.HResult.S_OK)
{
string name;
if (dispatchEx.GetMemberName(dispid, out name) == RawCOMHelpers.HResult.S_OK)
{
yield return name;
}
result = dispatchEx.GetNextDispID(DispatchEnumFlags.All, dispid, out dispid);
}
}
public static object Invoke(this IDispatchEx dispatchEx, bool asConstructor, object[] args)
{
using (var argVariantArrayBlock = new CoTaskMemVariantArgsByRefBlock(args))
{
using (var resultVariantBlock = new CoTaskMemVariantBlock())
{
EXCEPINFO excepInfo;
var dispArgs = new DISPPARAMS { cArgs = args.Length, rgvarg = argVariantArrayBlock.Addr, cNamedArgs = 0, rgdispidNamedArgs = IntPtr.Zero };
Marshal.ThrowExceptionForHR(dispatchEx.InvokeEx(SpecialDispIDs.Default, 0, asConstructor ? DispatchFlags.Construct : DispatchFlags.Method, ref dispArgs, resultVariantBlock.Addr, out excepInfo));
return Marshal.GetObjectForNativeVariant(resultVariantBlock.Addr);
}
}
}
public static object InvokeMethod(this IDispatchEx dispatchEx, string name, bool ignoreCase, object[] args)
{
int dispid;
Marshal.ThrowExceptionForHR(dispatchEx.GetDispID(name, ignoreCase ? DispatchNameFlags.CaseInsensitive : DispatchNameFlags.CaseSensitive, out dispid));
using (var argVariantArrayBlock = new CoTaskMemVariantArgsByRefBlock(args))
{
using (var resultVariantBlock = new CoTaskMemVariantBlock())
{
EXCEPINFO excepInfo;
var dispArgs = new DISPPARAMS { cArgs = args.Length, rgvarg = argVariantArrayBlock.Addr, cNamedArgs = 0, rgdispidNamedArgs = IntPtr.Zero };
Marshal.ThrowExceptionForHR(dispatchEx.InvokeEx(dispid, 0, DispatchFlags.Method, ref dispArgs, resultVariantBlock.Addr, out excepInfo));
return Marshal.GetObjectForNativeVariant(resultVariantBlock.Addr);
}
}
}
}
internal sealed class DynamicDispatchExWrapper : IDynamic
{
private readonly IDispatchEx dispatchEx;
public DynamicDispatchExWrapper(IDispatchEx dispatchEx)
{
this.dispatchEx = dispatchEx;
}
public object GetProperty(string name, params object[] args)
{
bool isCacheable;
return GetProperty(name, out isCacheable, args);
}
public object GetProperty(string name, out bool isCacheable, params object[] args)
{
isCacheable = false;
return dispatchEx.GetProperty(name, false, args);
}
public void SetProperty(string name, params object[] args)
{
dispatchEx.SetProperty(name, false, args);
}
public bool DeleteProperty(string name)
{
return dispatchEx.DeleteProperty(name, false);
}
public string[] GetPropertyNames()
{
return dispatchEx.GetPropertyNames().ExcludeIndices().ToArray();
}
public object GetProperty(int index)
{
return dispatchEx.GetProperty(index.ToString(CultureInfo.InvariantCulture), false, ArrayHelpers.GetEmptyArray<object>());
}
public void SetProperty(int index, object value)
{
dispatchEx.SetProperty(index.ToString(CultureInfo.InvariantCulture), false, new[] { value });
}
public bool DeleteProperty(int index)
{
return dispatchEx.DeleteProperty(index.ToString(CultureInfo.InvariantCulture), false);
}
public int[] GetPropertyIndices()
{
return dispatchEx.GetPropertyNames().GetIndices().ToArray();
}
public object Invoke(bool asConstructor, params object[] args)
{
return dispatchEx.Invoke(asConstructor, args);
}
public object InvokeMethod(string name, params object[] args)
{
return dispatchEx.InvokeMethod(name, false, args);
}
}
}