This must be the handle to a global block of memory
Length
The length of the DICOM data within the memory block
Remarks
This method can read data from either official “Part10” format files with the 128 byte header, or unofficial “Part3” format data without a header, and detection of the type is automatic. The data may have been written by the WriteMemory method or by other DICOM software. The memory block will be locked before use, then unlocked after. It is the containing application’s responsibility to free the block when no longer needed. As DICOM has no mechanism to determine the length of the image/dataset from the data alone, the Length parameter must be accurate.