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Code Issues Releases Wiki Activity

Added QueryInterface method for objects

pull/30/head
David Hall 2019-01-08 08:17:45 -07:00
parent f2605821b6
commit 9d83f279e1
1 changed files with 13 additions and 0 deletions
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13
Core/Extensions/InteropExtensions.cs
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@ -195,6 +195,19 @@ namespace Vanara.Extensions
/// <returns>A new pointer that reflects the addition of <paramref name="offset"/> to <paramref name="pointer"/>.</returns>
public static IntPtr Offset(this IntPtr pointer, long offset) => new IntPtr(pointer.ToInt64() + offset);
/// <summary>Queries the object for a COM interface and returns it, if found, in <paramref name="ppv"/>.</summary>
/// <param name="iUnk">The object to query.</param>
/// <param name="iid">The interface identifier (IID) of the requested interface.</param>
/// <param name="ppv">When this method returns, contains a reference to the returned interface.</param>
/// <returns>An HRESULT that indicates the success or failure of the call.</returns>
public static int QueryInterface(object iUnk, in Guid iid, out object ppv)
{
var tmp = iid;
var hr = Marshal.QueryInterface(Marshal.GetIUnknownForObject(iUnk), ref tmp, out var ippv);
ppv = hr == 0 ? Marshal.GetObjectForIUnknown(ippv) : null;
return hr;
}
/// <summary>Marshals data from a managed object to an unmanaged block of memory that is allocated using <paramref name="memAlloc"/>.</summary>
/// <typeparam name="T">The type of the managed object.</typeparam>
/// <param name="value">