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read and write operations in PL/I in LOCATE mode

 
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abhinav343
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Joined: 12 Jun 2007
Posts: 23
Topics: 12
PostPosted: Mon Jan 14, 2008 1:47 am    Post subject: read and write operations in PL/I in LOCATE mode Reply with quote
Hi All,

I want to understand the read and write operations in PL/I in LOCATE mode. Its bit confusing to me.

Thanks in Advance!!
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Nic Clouston
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Joined: 01 Feb 2007
Posts: 1075
Topics: 7
Location: At Home
PostPosted: Mon Jan 14, 2008 4:55 am    Post subject: Reply with quote
what is confusing you? with locate mode you process the data in the I/O buffers using pointers. To read:
Code:
READ FILE(blahi) SET(ptr);

Your input structure is base on this pointer. The SET keyword tells PL/1 to put the address of the reord just read intis pointer so you can now access it.

For writing:
Code:
 LOCATE record_var FILE(blaho);

This sets a pointer in the output buffer where you can now write the data. Your output structure is based on this pointer. PL/1 takes care of actually writing the data to the file when you issue another LOCATE and a block is filled or at EOJ

Note: there are variations on these statements but the above is the basic process.
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abhinav343
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Joined: 12 Jun 2007
Posts: 23
Topics: 12
PostPosted: Tue Jan 15, 2008 12:17 pm    Post subject: Reply with quote
Thanks Nic...That was very simple way to explain it.
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