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Calling HTMLDOC from C

C programs offer the best flexibility and easily supports on-the-fly report generation without the need for temporary files.

Here are some simple C functions that can be used to generate a PDF report to the HTTP client from a temporary file or pipe:

    #include <stdio.h>
    #include <stdlib.h>


    /* topdf() - convert a HTML file to PDF */
    FILE *topdf(const char *filename)           /* I - HTML file to convert */
    {
      char	command[1024];			/* Command to execute */


     /*
      * Tell HTMLDOC not to run in CGI mode...
      */

      putenv("HTMLDOC_NOCGI=1");

     /*
      * Write the content type to the client...
      */

      puts("Content-Type: application/pdf\n");

     /*
      * Run HTMLDOC to provide the PDF file to the user...
      */

      sprintf(command, "htmldoc --quiet -t pdf --webpage %s", filename);

      return (popen(command, "w"));
    }


    /* topdf2() - pipe HTML output to HTMLDOC for conversion to PDF */
    FILE *topdf2(void)
    {
     /*
      * Tell HTMLDOC not to run in CGI mode...
      */

      putenv("HTMLDOC_NOCGI=1");

     /*
      * Write the content type to the client...
      */

      puts("Content-Type: application/pdf\n");

     /*
      * Open a pipe to HTMLDOC...
      */

      return (popen("htmldoc --quiet -t pdf --webpage -", "w"));
    }

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