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HTML Color Generator
A Fortran GET CGI example
This program or
CGI takes a 6
digit hexadecimal number and
converts it to the corresponding HTML color, which is displayed in a
band across the center of a table. In addition, the program
calculates and displays the new color which results by increasing
or decreasing each digit. These additional colors are shown
in smaller squares, along with the corresponding hexadecimal
number. Up to 48 additional colors may be shown. If the
calculated increment is out of the hexadecimal range 0 through F,
"No Color" will be shown.
The source code for this program (HTML and Fortran CGI) is available for
download. COLORIT uses the GET method to receive data, reading the
input string from the environment variable QUERY_STRING using the intrinsic
routine getenv. The character string received
via getenv character string is subsequently parsed to retrieve the name=value
data pairs sent by the form. In a GET method string, the QUERY_STRING string
consists of everything to the right of the input URL, e.g. input=8CDC5F in
- The QUERY_STRING is a character string. If numbers are
contained in the string, they are ASCII characters and must be
converted to numbers before use.
- In this example,
the HTML output is established by the statements
55 Format("Content-type: text/html"//)
This code must be placed before any HTML statements are written
to output. (Yes, you can change the Format statement number.)
The two // are VERY IMPORTANT! Also, note the placement of the "
quotation marks. Compare to the corrsponding C language statement
- For HTML OUTPUT, the HTML tags are contained inside
Format statements, as shown in the example Fortran code.
BE SURE to have the usual HTML ending tags, or you may not see
any HTML output or receive an execution error code.
- Carefully watch use of ' and " in Format statements:
it's too easy to miss one ' or " or add too many.
- When generating output, statements must be no longer
than the 72 character limit in Fortran 77. Another Format
statement or a continuation character in Column 6 may be
used for longer statements.
- A CGI can output a new HTML form, or call a CGI.
The Fortran program can also incorporate subroutines, called in
the usual manner, although none are needed for this example.
- Fortran carriage control characters are unneeded when
generating HTML output. Use the HTML tags to perform this function.
However, to keep the browsers' source code view tidy, you can include
returns at the end of HTML lines:
111 format(" HTML text here! " /)
- The program has not been optimized. There certainly
are better ways to do some of the tasks or changes
which could be made to reduce the code,
but it's not necessary for this simple example. Please note that no
Fortran or CGI library functions were used in the preparation or
execution of this example. The program was designed as a
Senior Electronics Engineer
Audio Division, Media Bureau
Original page November 1998; revised March 25, 2002