Graphics Programs Reference
In-Depth Information
auread
Read SUN ('
.au
') sound file.
wavread
Read Microsoft WAVE ('
.wav
') sound file.
readsnd
Read SND resources and files (Macintosh only).
4. You can write an m-file to read the data, using
fopen
,
fread
, and
associated functions.
In this section we consider item (4). The functions available are
Category
Function Description
Open/close
Open file
fopen
Close file
fclose
Binary I/O
Read binary data from file
fread
Write binary data to file
fwrite
Formatted I/O
Read formatted data from file
fscanf
Write formatted data to file
fprintf
Read line from file, discard newline
character
fgetl
Read line from file, keep newline
character
fgets
String Conversion
sprintf
Write formatted data to string
Read string under format control
sscanf
File Positioning
Inquire file I/O error status
ferror
feof
Test for end-of-file
fseek
Set file position indicator
ftell
Get file position indicator
frewind
Rewind file
Temporary Files
tempdir
Get temporary directory name
tempname
Get temporary file name
Following is an example of how some of these functions are used.
Example:
fscanf
Suppose we have some data in a file formatted as follows:
10/06
11:18:00
-34.855
151.3057
216.4
70.91
-61.23 0.29
10/06
11:18:01
-34.85554
151.30649
214.8
71.38
-60.8
-0.88
10/06
11:18:02
-34.85609
151.30727
212.7
71.86
-60.64 -1.64
10/06
11:18:03
-34.85664
151.30807
210.8
72.4
-60.35 -1.67
10/06
11:18:04
-34.85717
151.30887
209.7
72.83
-60.06 -1.33
The data consists of a date string with a slash separator, a time string
with colon separators, and then six numbers separated by white space.
The function
fscanf
is used for reading formatted ascii data such as
this from a file. Suppose this file is called
asc.dat
. First, we must open
this file for reading using the
fopen
command:
