285 lines
8.9 KiB
C#
285 lines
8.9 KiB
C#
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/*
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LICENSE
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-------
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Copyright (C) 2007 Ray Molenkamp
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This source code is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this source code or the software it produces.
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Permission is granted to anyone to use this source code for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this source code must not be misrepresented; you must not
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claim that you wrote the original source code. If you use this source code
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original source code.
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3. This notice may not be removed or altered from any source distribution.
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*/
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// adapted for use in NAudio
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#pragma warning disable CS0618 // 'VarEnum' is obsolete: 'Marshalling VARIANTs may be unavailable in future releases.'
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using System;
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using System.IO;
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using System.Runtime.InteropServices;
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using NAudio.Utils;
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namespace NAudio.CoreAudioApi.Interfaces
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{
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/// <summary>
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/// from Propidl.h.
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/// http://msdn.microsoft.com/en-us/library/aa380072(VS.85).aspx
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/// contains a union so we have to do an explicit layout
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/// </summary>
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[StructLayout(LayoutKind.Explicit)]
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public struct PropVariant
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{
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/// <summary>
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/// Value type tag.
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/// </summary>
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[FieldOffset(0)] public short vt;
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/// <summary>
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/// Reserved1.
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/// </summary>
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[FieldOffset(2)] public short wReserved1;
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/// <summary>
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/// Reserved2.
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/// </summary>
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[FieldOffset(4)] public short wReserved2;
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/// <summary>
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/// Reserved3.
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/// </summary>
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[FieldOffset(6)] public short wReserved3;
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/// <summary>
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/// cVal.
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/// </summary>
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[FieldOffset(8)] public sbyte cVal;
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/// <summary>
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/// bVal.
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/// </summary>
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[FieldOffset(8)] public byte bVal;
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/// <summary>
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/// iVal.
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/// </summary>
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[FieldOffset(8)] public short iVal;
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/// <summary>
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/// uiVal.
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/// </summary>
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[FieldOffset(8)] public ushort uiVal;
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/// <summary>
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/// lVal.
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/// </summary>
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[FieldOffset(8)] public int lVal;
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/// <summary>
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/// ulVal.
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/// </summary>
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[FieldOffset(8)] public uint ulVal;
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/// <summary>
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/// intVal.
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/// </summary>
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[FieldOffset(8)] public int intVal;
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/// <summary>
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/// uintVal.
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/// </summary>
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[FieldOffset(8)] public uint uintVal;
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/// <summary>
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/// hVal.
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/// </summary>
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[FieldOffset(8)] public long hVal;
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/// <summary>
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/// uhVal.
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/// </summary>
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[FieldOffset(8)] public long uhVal;
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/// <summary>
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/// fltVal.
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/// </summary>
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[FieldOffset(8)] public float fltVal;
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/// <summary>
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/// dblVal.
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/// </summary>
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[FieldOffset(8)] public double dblVal;
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//VARIANT_BOOL boolVal;
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/// <summary>
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/// boolVal.
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/// </summary>
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[FieldOffset(8)] public short boolVal;
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/// <summary>
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/// scode.
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/// </summary>
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[FieldOffset(8)] public int scode;
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//CY cyVal;
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//[FieldOffset(8)] private DateTime date; - can cause issues with invalid value
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/// <summary>
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/// Date time.
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/// </summary>
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[FieldOffset(8)] public System.Runtime.InteropServices.ComTypes.FILETIME filetime;
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//CLSID* puuid;
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//CLIPDATA* pclipdata;
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//BSTR bstrVal;
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//BSTRBLOB bstrblobVal;
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/// <summary>
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/// Binary large object.
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/// </summary>
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[FieldOffset(8)] public Blob blobVal;
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//LPSTR pszVal;
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/// <summary>
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/// Pointer value.
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/// </summary>
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[FieldOffset(8)] public IntPtr pointerValue; //LPWSTR
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//IUnknown* punkVal;
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/*IDispatch* pdispVal;
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IStream* pStream;
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IStorage* pStorage;
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LPVERSIONEDSTREAM pVersionedStream;
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LPSAFEARRAY parray;
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CAC cac;
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CAUB caub;
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CAI cai;
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CAUI caui;
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CAL cal;
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CAUL caul;
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CAH cah;
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CAUH cauh;
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CAFLT caflt;
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CADBL cadbl;
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CABOOL cabool;
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CASCODE cascode;
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CACY cacy;
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CADATE cadate;
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CAFILETIME cafiletime;
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CACLSID cauuid;
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CACLIPDATA caclipdata;
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CABSTR cabstr;
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CABSTRBLOB cabstrblob;
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CALPSTR calpstr;
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CALPWSTR calpwstr;
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CAPROPVARIANT capropvar;
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CHAR* pcVal;
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UCHAR* pbVal;
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SHORT* piVal;
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USHORT* puiVal;
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LONG* plVal;
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ULONG* pulVal;
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INT* pintVal;
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UINT* puintVal;
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FLOAT* pfltVal;
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DOUBLE* pdblVal;
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VARIANT_BOOL* pboolVal;
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DECIMAL* pdecVal;
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SCODE* pscode;
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CY* pcyVal;
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DATE* pdate;
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BSTR* pbstrVal;
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IUnknown** ppunkVal;
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IDispatch** ppdispVal;
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LPSAFEARRAY* pparray;
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PROPVARIANT* pvarVal;
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*/
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/// <summary>
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/// Creates a new PropVariant containing a long value
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/// </summary>
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public static PropVariant FromLong(long value)
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{
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return new PropVariant() {vt = (short) VarEnum.VT_I8, hVal = value};
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}
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/// <summary>
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/// Helper method to gets blob data
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/// </summary>
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private byte[] GetBlob()
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{
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var blob = new byte[blobVal.Length];
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Marshal.Copy(blobVal.Data, blob, 0, blob.Length);
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return blob;
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}
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/// <summary>
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/// Interprets a blob as an array of structs
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/// </summary>
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public T[] GetBlobAsArrayOf<T>()
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{
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var blobByteLength = blobVal.Length;
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var singleInstance = (T) Activator.CreateInstance(typeof (T));
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var structSize = Marshal.SizeOf(singleInstance);
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if (blobByteLength%structSize != 0)
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{
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throw new InvalidDataException(String.Format("Blob size {0} not a multiple of struct size {1}", blobByteLength, structSize));
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}
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var items = blobByteLength/structSize;
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var array = new T[items];
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for (int n = 0; n < items; n++)
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{
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array[n] = (T) Activator.CreateInstance(typeof (T));
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Marshal.PtrToStructure(new IntPtr((long) blobVal.Data + n*structSize), array[n]);
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}
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return array;
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}
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/// <summary>
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/// Gets the type of data in this PropVariant
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/// </summary>
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public VarEnum DataType => (VarEnum) vt;
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/// <summary>
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/// Property value
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/// </summary>
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public object Value
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{
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get
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{
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VarEnum ve = DataType;
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switch (ve)
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{
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case VarEnum.VT_I1:
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return bVal;
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case VarEnum.VT_I2:
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return iVal;
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case VarEnum.VT_I4:
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return lVal;
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case VarEnum.VT_I8:
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return hVal;
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case VarEnum.VT_INT:
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return iVal;
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case VarEnum.VT_UI4:
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return ulVal;
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case VarEnum.VT_UI8:
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return uhVal;
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case VarEnum.VT_LPWSTR:
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return Marshal.PtrToStringUni(pointerValue);
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case VarEnum.VT_BLOB:
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case VarEnum.VT_VECTOR | VarEnum.VT_UI1:
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return GetBlob();
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case VarEnum.VT_CLSID:
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return Marshal.PtrToStructure<Guid>(pointerValue);
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case VarEnum.VT_BOOL:
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switch (boolVal)
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{
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case -1:
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return true;
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case 0:
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return false;
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default:
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throw new NotSupportedException("PropVariant VT_BOOL must be either -1 or 0");
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}
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case VarEnum.VT_FILETIME:
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return DateTime.FromFileTime((((long)filetime.dwHighDateTime) << 32) + filetime.dwLowDateTime);
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}
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throw new NotImplementedException("PropVariant " + ve);
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}
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}
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/// <summary>
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/// Clears with a known pointer
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/// </summary>
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public static void Clear(IntPtr ptr)
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{
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PropVariantNative.PropVariantClear(ptr);
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}
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}
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}
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