Moves the file pointer associated with the given file handle to the specified offset (in bytes). The usage is
fseek(handle,offset,style)
The handle
argument must be a value and active file handle. The
offset
parameter indicates the desired seek offset (how much the
file pointer is moved in bytes). The style
parameter determines
how the offset is treated. Three values for the style
parameter
are understood:
'bof'
or the value -1, which indicate the seek is relative
to the beginning of the file. This is equivalent to SEEK_SET
in
ANSI C.
'cof'
or the value 0, which indicates the seek is relative
to the current position of the file. This is equivalent to
SEEK_CUR
in ANSI C.
'eof'
or the value 1, which indicates the seek is relative
to the end of the file. This is equivalent to SEEK_END
in ANSI
C.
The first example reads a file and then ``rewinds'' the file pointer by seeking to the beginning. The next example seeks forward by 2048 bytes from the files current position, and then reads a line of 512 floats.
--> fp = fopen('test.dat','rb'); --> x = fread(fp,[1,inf],'float'); --> fseek(fp,0,'bof'); --> y = fread(fp,[1,inf],'float'); --> who x y Variable Name Type Flags Size x float [1 1024] y float [1 1024] --> fseek(fp,2048,'cof'); --> x = fread(fp,[512,1],'float'); Error: Insufficient data remaining in file to fill out requested size