PropVar.h
资源名称:MF.zip [点击查看]
上传用户:geng8029
上传日期:2021-01-30
资源大小:187k
文件大小:3k
源码类别:
Audio
开发平台:
Visual C++
- #pragma once
- #include <propsys.h>
- #include <propvarutil.h>
- ///////////////////////////////////////////////////////////////////////////////
- //
- // PropVariant Class
- //
- // Wrapper class for PROPVARIANT types.
- //
- // Notes:
- // This class offers accessor functions for a subset of the PROPVARIANT
- // data types, designed to handle all of the types in actual use by
- // Media Foundation at this time.
- //
- ///////////////////////////////////////////////////////////////////////////////
- class PropVariant : public PROPVARIANT
- {
- public:
- PropVariant()
- {
- PropVariantInit(this);
- }
- ~PropVariant()
- {
- PropVariantClear(this);
- }
- void Clear()
- {
- PropVariantClear(this);
- }
- HRESULT SetBlob(DWORD cbSize, BYTE *pBuffer) // VT_BLOB
- {
- Clear();
- BYTE *pb = (BYTE*)CoTaskMemAlloc(cbSize);
- if (pb == NULL)
- {
- return E_OUTOFMEMORY;
- }
- this->blob.cbSize = cbSize;
- CopyMemory(this->blob.pBlobData, pBuffer, cbSize);
- return S_OK;
- }
- HRESULT SetBOOL(BOOL val) // VT_BOOL
- {
- Clear();
- return InitPropVariantFromBoolean(val, this);
- }
- HRESULT SetGUID(const GUID guid) // VT_CLSID
- {
- Clear();
- return InitPropVariantFromCLSID(guid, this);
- }
- HRESULT SetInt32(LONG val) // VT_I4
- {
- Clear();
- return InitPropVariantFromInt32(val, this);
- }
- HRESULT SetString(const WCHAR *str) // VT_LPWSTR
- {
- return InitPropVariantFromString(str, this);
- }
- HRESULT SetStringVector(const WCHAR **ppstr, ULONG cElems) // VT_LPWSTR | VT_VECTOR
- {
- Clear();
- return InitPropVariantFromStringVector(ppstr, cElems, this);
- }
- HRESULT SetUInt32(ULONG val) // VT_UI4
- {
- Clear();
- return InitPropVariantFromUInt32(val, this);
- }
- HRESULT SetUInt32Vector(const ULONG *pVals, ULONG cElems) // VT_UI4 | VT_VECTOR
- {
- Clear();
- return InitPropVariantFromUInt32Vector(pVals, cElems, this);
- }
- HRESULT SetUnknown(IUnknown *pUnk) // VT_UNKNOWN
- {
- if (pUnk == NULL) { return E_POINTER; }
- Clear();
- this->punkVal = pUnk;
- this->punkVal->AddRef();
- this->vt = VT_UNKNOWN;
- return S_OK;
- }
- private:
- PropVariant& operator=(const PropVariant& var);
- PropVariant(const PropVariant &var);
- };
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