Move to specified position in file
fseek(fileID, offset, origin)status = fseek(fileID, offset, origin)
fseek( sets
the file position indicator fileID, offset, origin)offset bytes
from origin in the specified file.
status = fseek(fileID, offset, origin)0 when
the operation is successful. Otherwise, it returns -1.
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Integer file identifier obtained from |
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Number of bytes to move from |
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Starting location in the file, specified as a character vector, string scalar or a scalar number:
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Copy 5 bytes from the file test1.dat, starting
at the tenth byte, and append to the end of test2.dat:
% Create files test1.dat and test2.dat
% Each character uses 8 bits (1 byte)
fid1 = fopen('test1.dat', 'w+');
fwrite(fid1, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ');
fid2 = fopen('test2.dat', 'w+');
fwrite(fid2, 'Second File');
% Seek to the 10th byte ('J'), read 5
fseek(fid1, 9, 'bof');
A = fread(fid1, 5, 'uint8=>char');
fclose(fid1);
% Append to test2.dat
fseek(fid2, 0, 'eof');
fwrite(fid2, A);
fclose(fid2);To move to the beginning of a file, call
frewind(fileID)
This call is identical to
fseek(fileID, 0, 'bof')