本文介绍了一个简单的CGI程序示例，该程序能够根据浏览器类型输出不同的消息，并通过表单接收查询字符串来执行文件搜索任务。文章包含两个CGI程序：一个是判断浏览器类型的脚本，另一个则是基于输入关键词进行文件搜索的程序。
轉載+老子修改
這是一個最簡單的cgi，它根據瀏覽器的不同打印出一句話。
#include <stdio.h>#include <stdlib.h>#include <string.h>void main(void)
...{
char *http_user_agent; printf("Content-type: text/plain "); http_user_agent = getenv ("HTTP_USER_AGENT");
if(http_user_agent == NULL)...{ printf("Oops! Your browser failed to set the HTTP_USER_AGENT "); printf("environment variable! "); }else if(!strncmp (http_user_agent, "Mosaic", 6))...{ printf("I guess you are sticking with the original, huh? "); }else if(!strncmp (http_user_agent, "Mozilla", 7))...{ printf("Well, you are not alone. A majority of the people are "); printf("using Netscape Navigator! "); }else if(!strncmp (http_user_agent, "Lynx", 4))...{ printf("Lynx is great, but go get yourself a graphic browser! "); }else...{ printf("I see you are using the %s browser. ", http_user_agent); printf("I don't think it's as famous as Netscape, Mosaic or Lynx! ");
} exit (0);
}======================================================================
又一個
seek.html頁面
<html><head><title>Untitled Document</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312"></head> <body><p>請輸入查詢字符串</p><form name="form1" action="./a.out"><p> </p><p> <input name="keyname" value="" type=text></p><p><input type="submit" value="查詢"></p></form><p> </p></body></html>
mycgi.c
#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <sys/types.h>#include <fcntl.h>#include <time.h>#include <string.h>int main(int argc, char *argv[])...{ int fd; int status; time_t i; char cFileName[64]; char cTempName[64]; char cBuffer[1024]; char *p = cBuffer; char cContent[10240]; char *data; char keyword[1024]; data = getenv("QUERY_STRING"); if(data == NULL)...{ printf("Content-Type:text/html"); printf("not found!"); exit(1); } sscanf(data, "keyname=%s&", keyword); p += sprintf(p, "locate '%s' | sed -e 's#^/usr/local/apache/htdocs#http://127.0.0.1#' | sed -e 's#^.*$#<a href=&>&</a>#' > ", keyword); i = time(NULL); sprintf(cTempName, "%d.html", i); sprintf(cFileName, "/usr/local/apache/temp/%d.html", i); strcat(cBuffer, cFileName); cBuffer[1024 - 1] = 0; system(cBuffer); fd = open(cFileName, O_RDWR); status = read(fd, cContent, sizeof(cContent) - 1); close(fd); printf("Content-Type:text/html"); printf("<meta http-equiv=refresh content=0;url=http://127.0.0.1/temp/%s>", cTempName); //printf("%s", cTempName); printf("Waiting....................... "); printf("%s", keyword); return 0;}
gcc mycgi.c
然後把輸出的a.out（還有seek.html）複製到tomcat(Linux)的webapps/ROOT目錄下，加上執行權限就行了~
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