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Formatting fread binary file (converting from FORTRAN script)

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Darcy Cordell
Darcy Cordell am 15 Jul. 2020
Kommentiert: dpb am 16 Jul. 2020
I am converting some Fortran to MATLAB and am stuck early on when trying to load a binary file. I know MATLAB well but I have not had much experience loading binary files. I have mostly had to only load text files in the past. Furthermore, I am a newbie to Fortran and the I/O commands and generally lower-level language is a challenge.
The Fortran script has a read statement:
READ(Ifile,FMT='(A70)',ERR=993) Tag
My understanding is that this command has a file id (Ifile) similar to "fid" which has been called using a previous OPEN command (similar to fopen).
Furthermore, the '(A70)' specifies that the read command should read 70 bytes of the file as a character (A).
The result is stored in the variable "Tag".
However, in MATLAB, if I use
Tag = fread(fid,70,'char')
I don't get the same result as Fortran.
What am I missing here? Any help is appreciated.
  3 Kommentare
James Tursa
James Tursa am 16 Jul. 2020
Bearbeitet: James Tursa am 16 Jul. 2020
You might have to skip 4 bytes first, and use '*char' formatting (with the asterisk) to get a char result. E.g., you might have to use some variation of these lines:
fread(fid,[1 4],'*uint8');
Tag = fread(fid,[1 70],'*char',4);
dpb
dpb am 16 Jul. 2020
Specifically, the file could be SEQUENTIAL or DIRECT. If it is direct access, then there will be as James notes a record marker at beginning (and perhaps end) of each record that will have to skip; a sequential file will have only record terminators and can be variable length; direct access is fixed-length.

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