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#1
May 8th, 2008, 10:06 AM
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Sequential and binary files
Can anyone explain the difference in the processing required to update a record in a sequential text file and a random access binary file. Any example would be welcome.
Thanks
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#2
May 8th, 2008, 10:20 AM
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Without any context, your question is ambiguous. But I imagine that sequentially it is expected that each modification requires the entire file to be rewritten, whereas with random access, the record can be modified in-place.
For random access to to work, each record must be of a known and identical size. or have some sort of index or directory. An easy way to implement random access files is to use memory mapped files. Memory mapped file implementation is platform specific and relies on virtual memory support from the OS and CPU. Clifford
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#3
May 8th, 2008, 10:43 AM
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Quote:
thanks for the help
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