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IDTSBuffer100.GetBLOBData Method

Retrieves an array of bytes from a binary large object (BLOB) stored in a column of a IDTSBuffer100.

Namespace:  Microsoft.SqlServer.Dts.Pipeline.Wrapper
Assembly:  Microsoft.SqlServer.DTSPipelineWrap (in Microsoft.SqlServer.DTSPipelineWrap.dll)

void GetBLOBData(
	int hRow,
	int hCol,
	uint dwOffset,
	ref byte lpPointer,
	uint dwLength,
	out uint lpdwWritten
)

Parameters

hRow
Type: Int32
The row handle.
hCol
Type: Int32
The column handle.
dwOffset
Type: UInt32
The location in the byte data stored in the column from which to begin reading bytes.
lpPointer
Type: Byte
A reference parameter that points to the first byte in the array of bytes that are retrieved.
dwLength
Type: UInt32
The number of bytes to retrieve from the column.
lpdwWritten
Type: UInt32
An out parameter that indicates the number of bytes written to the lpPointer parameter.

When retrieving data from a column that contains a BLOB, such as a DT_IMAGE, specify the starting location in the BLOB with the dwOffset parameter, and the number of bytes to retrieve in the dwLength parameter. Retrieving the data from a BLOB column in sections is recommended to avoid situations that may occur if the size of the data in the BLOB is larger than the available memory on the computer.

This method is used to retrieve a section of bytes from the column specified by the hCol parameter in the IDTSBuffer100. This method is typically used to recursively when sequentially reading BLOB sections.

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