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com安全數組類型

創建復制數據給它例如這樣:

// set up safearray - SAFEARRAY is defined OAIDL.H
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SAFEARRAY *psa;
3

// create a safe array to store the stream data
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psa = SafeArrayCreateVector( VT_UI1, 0, llen );
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// pointers to byte arrays
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unsigned char *pData = NULL;
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// get a pointer to the safe array. Locks the array.
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SafeArrayAccessData( psa, (void**)&pData );
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// copy the memory file into the safearray
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memcpy( pData, pMemData, llen );
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// clean up buffer
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delete pMemData;
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// unlock access to safearray
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SafeArrayUnaccessData(psa);
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// return a pointer to a SAFEARRAY allocated here
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return psa;
24

接收復制數據給別人例如這樣:

long lLength; // number of bytes
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char *pBuffer; // buffer pointer
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// lock access to array data
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SafeArrayAccessData( psa, (void**)&pBuffer );
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// get number of elements in array. This is the number of bytes
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lLength = psa->rgsabound->cElements;
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// attach the buffer to the memory file
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memfile.Attach((unsigned char*)pBuffer, lLength);
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// start at beginning of buffer
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memfile.SeekToBegin();
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// create an archive with the attached memory file
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CArchive ar(&memfile, CArchive::load | CArchive::bNoFlushOnDelete);
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// document pointer is not used
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ar.m_pDocument = NULL;
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// inflate the object and get the pointer
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rpObj = ar.ReadObject(0);
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// close the archive
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ar.Close();
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// Note: pBuffer is freed when the SAFEARRAY is destroyed
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// Detach the buffer and close the file
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pBuffer = (char*) memfile.Detach();
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// release the safearray buffer
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SafeArrayUnaccessData( psa );
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posted on 2011-12-25 18:43 DK_jims 閱讀(354) 評論(0) 編輯收藏引用所屬分類: C++

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