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POWrite and read access=stream files in fortran
 

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  1. POWrite and read access=stream files in fortran
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    <p>I have a shell script from which I pass a binary file to a fortran program such that </p> <pre><code>Mth=$1 loop=1 it=1 while test $it -le 12 do Mth=`expr $Mth + $loop` file="DataFile"$Mth".bin" ./fort_exe ${Yr} ${nt} ${it} # Increment loop it=`expr $it + 1` done </code></pre> <p>This script is used to pass 12 files within a do loop to the fortran program. In the fortran program, I read the binary file passed from the shell script and I am trying to write a 2nd file which would compile in a single file all the data that was read from the consecutive files e.g.</p> <pre><code> !Open binary file passed from shell script open(1,file='Datafile'//TRIM{Mth)//.bin',action='read',form='unformatted',access='direct', &amp; recl=4*x*y, status='old') ! Open write file for t 1. The status is different in t 1 and t &gt; 1 so I open it twice: I guess there is a more elegant way to do this... open(2,file='Newfile.bin',action='write',form='unformatted', &amp; access='stream', position='append', status='replace') irec = 0 do t = 1, nt ! Read input file irec = irec + 1 read(1,rec=irec) val(:,:) ! write output file irecW= irec + (imonth-1)*nt if ( t .eq. 1) write(2,pos=irecW) val(:,:) ! Close file after t = 1, update the status to old and reopen. if ( t .eq. 2) then close (2) open(2,file='Newfile.bin',action='write',form='unformatted', &amp; access='stream', position='append',status='old') endif if ( t .ge. 2) write(2,pos=irecW) val(:,:) enddo </code></pre> <p>I can read the binary data from the first file no problem but when I try and read from another program the binary data from the file that I wrote in the first program such that </p> <pre><code> open(1,file='Newfile.bin',action='read',form='unformatted', &amp; access='stream', status='old') irec=0 do t = 1, nt ! Read input file irec = irec + 1 read(1,pos=irec) val(:,:) write(*,*) val(:,:) enddo </code></pre> <p>val(:,:) is nothing but a list of zeros. This is the first time I use access=stream which I believe is the only way I can use position='append'. I have tried compiling with gfortran and ifort but I do not get any error messages. </p> <p>Does anyone have any idea why this is happening?</p>
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