标签：cgi post data 微信公众平台开发
【问题】用c编写cgi程序如何取出html表单post来的数据？
【分析】html表单post来的数据形如username="zhang"&&password="123456"&&useid="012"
【方法1】
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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char* getcgidata(FILE* fp, char* requestmethod);
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int main()
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{
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char *input;
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char *req_method;
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char name[64];
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char pass[64];
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char userid[64];
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int i = 0;
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int j = 0;
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// printf("Content-type: text/plain; charset=iso-8859-1\n\n");
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printf("Content-type: text/html\n\n");
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printf("The following is query reuslt:<br><br>");
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req_method = getenv("REQUEST_METHOD");
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input = getcgidata(stdin, req_method);
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for ( i = 9; i < (int)strlen(input); i++ )
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{
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if ( input[i] == ‘&‘ )
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{
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name[j] = ‘\0‘;
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break;
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}
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name[j++] = input[i];
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}
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for ( i = 19 + strlen(name), j = 0; i < (int)strlen(input); i++ )
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{
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if ( input[i] == ‘&‘ )
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{
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pass[j] = ‘\0‘;
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break;
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}
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pass[j++] = input[i];
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}
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for ( i = 30 + strlen(pass)+ strlen(name), j = 0; i < (int)strlen(input); i++ )
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{
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userid[j++] = input[i];
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}
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userid[j] = ‘\0‘;
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printf("Your Username is %s<br>Your Password is %s<br>Your userid is %s<br> \n", name, pass,userid);
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return 0;
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}
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char* getcgidata(FILE* fp, char* requestmethod)
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{
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char* input;
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int len;
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int size = 1024;
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int i = 0;
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if (!strcmp(requestmethod, "GET"))
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{
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input = getenv("QUERY_STRING");
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return input;
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}
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else if (!strcmp(requestmethod, "POST"))
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{
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len = atoi(getenv("CONTENT_LENGTH"));
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input = (char*)malloc(sizeof(char)*(size + 1));
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if (len == 0)
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{
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input[0] = ‘\0‘;
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return input;
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}
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while(1)
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{
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input[i] = (char)fgetc(fp);
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if (i == size)
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{
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input[i+1] = ‘\0‘;
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return input;
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}
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--len;
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if (feof(fp) || (!(len)))
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{
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i++;
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input[i] = ‘\0‘;
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return input;
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}
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i++;
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}
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}
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return NULL;
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}
【方法2】
1 先将post来的数据整体读入info
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char *info=NULL;
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char username[64];
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char passwd[64];
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int userid;
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int lenstr=0;
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memset(username,0,64);
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memset(passwd,0,64);
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userid=0;
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/*
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* Get the data by post method from index.html
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*/
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lenstr=atoi(getenv("CONTENT_LENGTH"));
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info=(char *)malloc(lenstr+1);
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fread(info,1,lenstr,stdin);
2 将info作为文件流输入，利用sscanf提取子串
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sscanf(info,"username=%[^&]&passwd=%[^&]&userid=%d",username,passwd,&userid);
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free(info);
注：如果数据为实型，则利用sscanf时，要加上&，如上例userid
【思考】如果子串为username=zhang; passwd=123; userid=012，如何用【方法2】提取？
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sscanf(info,"username=%[^;]; passwd=%[^;]; userid=%d",&username,&passwd,&userid);
注意：将%[^&]&替换为%[^;];。通过本例，可以明白%[^;];的用法。
【解析】%[^&]是正则表达式，详细请参考：
http://blog.chinaunix.net/space.php?uid=9195812&do=blog&cuid=499274
cgi程序读取post发送的特殊字符，尤其适合于微信公众平台开发中发送被动消息
标签：cgi post data 微信公众平台开发
原文地址：http://blog.csdn.net/nyist327/article/details/40395779
