GNU f90 read() run time error
in [Fortran]
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From: lumbot on 7 May 2010 02:15 I am getting the following error: Fortran runtime error: I/O past end of record on unformatted file The codes are: character(100)fin real(4)a fin='xx.bin' open(unit=2,file=fin,status='old',ACCESS='SEQUENTIAL',FORM='UNFORMATTED') read(2)a write(*,*)a close(2) The file exists >l xx.bin -rw-r--r-- 1 -- staff 19353628 May 5 14:01 ./xx.bin Any clue
From: Arjen Markus on 7 May 2010 02:40 On 7 mei, 08:15, lumbot <lum...(a)gmail.com> wrote: > I am getting the following error: > Fortran runtime error: I/O past end of record on unformatted file > > The codes are: > character(100)fin > real(4)a > fin='xx.bin' > > open(unit=2,file=fin,status='old',ACCESS='SEQUENTIAL',FORM='UNFORMATTED') > read(2)a > write(*,*)a > close(2) > > The file exists>l xx.bin > > -rw-r--r-- 1 -- staff 19353628 May 5 14:01 ./xx.bin > > Any clue The first record in the file (assuming the file is properly structured as an unformatted file) could be shorter than the number of bytes that make up a single real. While unformatted files can have any structure, depending on the compiler used for the program that created the file, most nowadays use the following scheme: - Each record starts with 4 bytes indicating the number of bytes of data - The same 4 bytes appear after the data bytes Could the file possible be a _binary_ file? For instance it is written by a C program, so it is not structured with records and record markers? In that case, try ACCESS='STREAM' (a sufficiently modern version of gfortran supports that F2003 feature) Regards, Arjen
From: Tobias Burnus on 7 May 2010 04:10 On 05/07/2010 08:15 AM, lumbot wrote: > I am getting the following error: > Fortran runtime error: I/O past end of record on unformatted file You haven't told us the version of the compiler you are using - nor how you have created the file you are reading (if you used a different compiler/compiler version to create it, tell us which). Tobias
From: glen herrmannsfeldt on 7 May 2010 06:15 lumbot <lumbot(a)gmail.com> wrote: > I am getting the following error: > Fortran runtime error: I/O past end of record on unformatted file (snip) > The file exists >>l xx.bin > -rw-r--r-- 1 -- staff 19353628 May 5 14:01 ./xx.bin Try: od -x xx.bin | head -- glen
From: feenberg on 7 May 2010 07:16
On May 7, 2:15 am, lumbot <lum...(a)gmail.com> wrote: > I am getting the following error: > Fortran runtime error: I/O past end of record on unformatted file > > The codes are: > character(100)fin > real(4)a > fin='xx.bin' > > open(unit=2,file=fin,status='old',ACCESS='SEQUENTIAL',FORM='UNFORMATTED') > read(2)a > write(*,*)a > close(2) > > The file exists>l xx.bin > > -rw-r--r-- 1 -- staff 19353628 May 5 14:01 ./xx.bin > > Any clue Unless the file was written by a Fortran program from the same compiler, "unformatted" will not be able to read the file. Fortran "unformatted" is not a way to read generic binary data, but only reads record oriented files with a specific non-portable structure. To read files from another source a direct access file with a record length of 1 is possible. Daniel Feenberg |