ILMDVRSource::ReadData

#include "ILMDVRSource.h"

C Syntax	HRESULT ILMDVRSource__ReadData(pILMDVRSource, startOffset, minSize, maxSize, dwUserData, pData, pSizeRead)
C++ Syntax	HRESULT ReadData(startOffset, minSize, maxSize, dwUserData, pData, pSizeRead)

ILMDVRSource *pILMDVRSource;	/* pointer to an interface */
double startOffset;	/* data read starting offset */
long minSize;	/* minimum size to read*/
long maxSize;	/* maximum size to read */
DWORD dwUserData;	/* Reserved */
BYTE * pData;	/* pointer to a block of memory data */
long * pSizeRead;	/* pointer to data read size */

Reads the DVRSource data associated with the specified offset.

Parameter	Description
pILMDVRSource	Pointer to an ILMDVRSource interface.
startOffset	A double value indicating the starting offset for the read operation.
minSize	A long value specifying the minimum size to read.
maxSize	A long value specifying the maximum size to read.
dwUserData	Reserved.
pData	A pointer to a block of memory that will receive the read data.
pSizeRead	Pointer to a long type that will receive the size of the read data.

Returns

S_OK	The function was successful.
<> S_OK	An error occurred. Refer to the Error Codes or the HRESULT error codes in the DirectShow documentation.

Comments

S_OK if successful; otherwise, returns a code indicating the reason for failure:

E_UNEXPECTED = Unexpected invalid file handle

LTMM_E_DVR_DISCARDED_DATA = Data has been discarded due to a restart.

LTMM_E_DVR_CORRUPT_STUB_FILE = Corrupted .LBL file.

Required DLLs and Libraries

ILMDVRSource

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

See Also

Elements:	ILMDVRSource::GetAvailabilityInfo, ILMDVRSource::CopyBufferToFile, ILMDVRSource::ResetToDefaultsEx, ILMDVRSource::GetBufferInfo
Topics:	Multimedia Function Group, DVR Function Groups, Introduction to the LEADTOOLS DVR Module, DVR Module FAQs, LEAD DVR Sink Filter, Accessing the DVR Sink Object,How to Use the DVR Sink Object to Control Capture Buffer Settings (C++), How to Set Capture Buffers on More Than One Physical Disk, How to Copy Buffered DVR Data to a New File

Example