参考资料：
非常不错的总结，推荐
https://blog.51cto.com/9291927/1828278
这里也有一篇不错的总结，推荐
https://www.cnblogs.com/programmer-wfq/p/5582114.html
https://blog.csdn.net/yand789/article/details/38111667
https://www.iqiyi.com/v_19rr7ydm10.html#curid=719231400_0b8a33f235040f021908837f6c521bf0
https://www.xuebuyuan.com/1864640.html
关于cgi中如何获取get与post的参数信息：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char InputBuffer[4096];
int DecodeAndProcessData(char *input); /*具体译码和处理数据，该函数代码略*/
int main(int argc, char*argv[])
{
int ContentLength; /*数据长度*/
int x;
int i;
char *p;
char *pRequestMethod; /* METHOD属性值 */
setvbuf(stdin,NULL,_IONBF,0); /*关闭stdin的缓冲*/
printf("Content-type:text/html; charset=UTF-8\n\n"); /*从stdout中输出，告诉Web服务器返回的信息类型*/
printf("\n"); /*插入一个空行，结束头部信息*/
printf("<p>hello test</p>");
/* 从环境变量REQUEST_METHOD中得到METHOD属性值 */
pRequestMethod = getenv("REQUEST_METHOD");
if(pRequestMethod==NULL)
{
printf("<p>request = null</p>");
return 0;
}
if (strcasecmp(pRequestMethod,"POST")==0)
{
printf("<p>OK the method is POST!\n</p>");
p = getenv("CONTENT_LENGTH"); //从环境变量CONTENT_LENGTH中得到数据长度
if (p!=NULL)
{
ContentLength = atoi(p);
}
else
{
ContentLength = 0;
}
if (ContentLength > sizeof(InputBuffer)-1) {
ContentLength = sizeof (InputBuffer) - 1;
}
i = 0;
while (i < ContentLength)
{
//从stdin中得到Form数据
x = fgetc(stdin);
if (x==EOF)
break;
InputBuffer[i++] = x;
}
InputBuffer[i] = '\0';
ContentLength = i;
DecodeAndProcessData(InputBuffer); //具体译码和处理数据，该函数代码略
}
else if (strcasecmp(pRequestMethod,"GET")==0)
{
printf("<p>OK the method is GET!\n</p>");
p = getenv("QUERY_STRING"); //从环境变量QUERY_STRING中得到Form数据
if (p!=NULL)
{
strncpy(InputBuffer,p,sizeof(InputBuffer));
DecodeAndProcessData(InputBuffer); //具体译码和处理数据，该函数代码略
}
}
printf("<HEAD><TITLE>Submitted OK</TITLE></HEAD>\n");//从stdout中输出返回信息
printf("<BODY>The information you supplied has been accepted.</BODY>\n");
return 0;
}
int DecodeAndProcessData(char *input) //具体译码和处理数据
{
printf("POST内容：%s",input);
// 补充具体操作
return 0;
}
其中GET请求可以通过
cgic库中
char *content;
content=getenv(“QUERY_STRING”);
printf("%s",cgiQueryString);
的方式直接获取
POST的参数须解析 stdin
传递参数校验
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include "cgic.h"
#include "cJSON.h"
#define LABEL_LEN 32
uint32_t rwg_get_request_params(char *key,char *value,uint32_t len){
cgiFormResultType cgi_form_result;
cgi_form_result=cgiFormString(key,value,len);
return cgi_form_result;
}
int cgiMain(){
cgiHeaderContentType("text/html");
cgiFormResultType cgi_form_result;
// char label[LABEL_LEN];
// cgi_form_result=cgiFormString("label",label,LABEL_LEN);
// if (cgi_form_result == cgiFormSuccess)
// {
// printf("Parameters received successfully:%s",label);
// }
// else
// {
// printf("Parameter reception failed,identification code:%d",cgi_form_result);
// }
char *label_key_test="label";
char label_value_test[LABEL_LEN];
cgi_form_result=rwg_get_request_params(label_key_test,label_value_test,LABEL_LEN);
printf("rwg_get_request_params result :%d\n",cgi_form_result);
if (cgi_form_result == cgiFormSuccess)
{
printf("Parameters received successfully:%s\n",label_value_test);
}
else
{
printf("Parameter reception failed,identification code:%d\n",cgi_form_result);
}
}