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  1.  Home
  2. RPG400-L
  3. February 2005

Re: RPG read loops

On Tue, 1 Feb 2005, Paul Morgan wrote:

You could code your own procedure:

P ReadMore     B
D ReadMore     PR       N
/Free
 Return Not %Eof(FileToRead);
/End-Free
P ReadMore      E

Then your read loop would be:

Read FileToRead;
DoW ReadMore();
 // do something
 Read FileToRead;
EndDo;


But this doesn't do what was asked.  The example was:

DoW  %read(FileToRead)
.....
EndDo

The read is done when the dow is evaluated. Using your approach above doesn't gain you anything. But doing the read *at the time of the DOW evaluation* is very nice as it 1. reduces the number of lines and 2. makes clear under what conditions the loop continues. Some psuedo-code to implement this might look like:

P readmyfile      B
D readmyfile      PR
C          read  myfile
           return %EOF
P readmyfile      E

For this to work %EOF would have to be off on a successful read. Then you could code what was asked for:

dow (readmyfile <> %EOF)

James Rich

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        - billyskank on Groklaw

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