ambalavanan
Programmer
If anybody around here has written a CGI script in C/ C++ or knows to write one... and feels that he can help somebody dying to learn that.. it would be very much appreciated...
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Can Somebody tell me the basic's of writing a CGI application in C
- Thread starter ambalavanan
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vcherubini
Programmer
You might want to check out Matt's Script Archive. I believe that he has some that you can download.<br><br><A HREF=" TARGET="_new"> this helps.<br><br>-Vic
If I remember correctly it's very similar to what you do in Perl, only obviously using C commands... 
<br><br>So you want to get any user input from the environment, rather than being able to read straight from %ENV as in perl, you'll need to use getenv:<br><br>*note the names of the variables can vary with which HTTP server you are using*<br><br><FONT FACE=monospace>#include <stdlib.h><br><br>char *result = NULL;<br>char *env_name = NULL;<br><br>/* set our env_name to the envirable we want to read */<br>env_name = malloc(sizeof("VARIABLENAME"
;<br>strcpy(env_name,"VARIABLENAME"<br>result = malloc(sizeof(getenv(env_name));<br><br>if (result == NULL)<br>{<br> printf("VARIABLENAME doesn't exist\n"<br>}<br>else<br>{<br> printf("VARIABLENAME is %s \n", result);<br>}</font><br><br>Then you just write to the page as you would normally, e.g.<br><br><FONT FACE=monospace>/* print http header */<br>fprintf(STDOUT, "Content-type:text/html\n\n"<br>fprintf(STDOUT, "blah blah blah....</font><br><br>You can get a list of HTTP/CGI envirables via O'Reilly (webmaster in a nutshell Ch.11, p87 - latest edition)<br><br>Hope that helps<br>Loon<br>
<br><br>So you want to get any user input from the environment, rather than being able to read straight from %ENV as in perl, you'll need to use getenv:<br><br>*note the names of the variables can vary with which HTTP server you are using*<br><br><FONT FACE=monospace>#include <stdlib.h><br><br>char *result = NULL;<br>char *env_name = NULL;<br><br>/* set our env_name to the envirable we want to read */<br>env_name = malloc(sizeof("VARIABLENAME"<br>strcpy(env_name,"VARIABLENAME"<br>result = malloc(sizeof(getenv(env_name));<br><br>if (result == NULL)<br>{<br> printf("VARIABLENAME doesn't exist\n"<br>}<br>else<br>{<br> printf("VARIABLENAME is %s \n", result);<br>}</font><br><br>Then you just write to the page as you would normally, e.g.<br><br><FONT FACE=monospace>/* print http header */<br>fprintf(STDOUT, "Content-type:text/html\n\n"<br>fprintf(STDOUT, "blah blah blah....</font><br><br>You can get a list of HTTP/CGI envirables via O'Reilly (webmaster in a nutshell Ch.11, p87 - latest edition)<br><br>Hope that helps<br>Loon<br>- Status