一、背景
现在的情形是远程服务端的接口参数和返回类型都是json的字符串。所以我们主要做的就是：连接远程url、找到接口，将基本类型的数据封装成json数据传入接口，然后获取返回值，并解析返回的json数据。
二、配置环境
安装curl库
2.解压：tar -xzvf curl-7.38.0.tar.gz
cd curl-7.38.0
sudo make
4.查看/usr/include目录下有没有curl文件夹，没有的话需要将解压包/curl-7.38.0/include中的curl拷贝过去
6.将路径加入系统查找路径中：
将目录/usr/local/lib写入该文件中
7 安装完成
1.下载JsonCpp：http://sourceforge.net/projects/jsoncpp/files/
3.解压scons-2.1.0.tar.gz：tar -zvxf scons-2.1.0.tar.gz
5.解压jsoncpp:tar -zvxf jsoncpp-src-0.5.0.tar.gz
7.将/jsoncpp-src-0.5.0/include/目录下的json文件夹拷贝到/usr/include/
三、编写代码
#include <stdio.h>
#include <unistd.h>
#include <curl/easy.h>
#include <json/json.h>
#include <iostream>
using namespace std;
size_t push_string(void* buffer, size_t size, size_t nmemb, void* stream)
string data((const char*)buffer, (size_t) size * nmemb);
return size*nmemb;
}
char *send_post(char *url, char *param)
std::stringstream res_str;
CURL *curl_handle = NULL;
CURLcode curl_res;
curl_res = curl_global_init(CURL_GLOBAL_ALL);
// printf("param is: %s\n", param);
if(curl_res == CURLE_OK)
curl_handle = curl_easy_init();
{
curl_easy_setopt(curl_handle, CURLOPT_POST, 1);
curl_easy_setopt(curl_handle, CURLOPT_POSTFIELDS, param);
curl_easy_setopt(curl_handle, CURLOPT_SSL_VERIFYHOST, 0);
curl_easy_setopt(curl_handle, CURLOPT_CONNECTTIMEOUT, 10L);
curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, &res_str);
curl_easy_setopt(curl_handle, CURLOPT_HEADER, 0L);
struct curl_slist *pList = NULL;
pList = curl_slist_append(pList,"Content-Type: application/json;charset=utf-8");
curl_easy_setopt(curl_handle, CURLOPT_HTTPHEADER, pList);
if(curl_res != CURLE_OK)
printf("curl_easy_perform error, err_msg:[%ld]\n", curl_res);
curl_easy_cleanup(curl_handle);
}
else
printf("CURL ERROR : %s", curl_easy_strerror(curl_res));
}
std::string str_json = res_str.str();
str = (char *)malloc(200);
return str;
}
//解析json格式的返回值
void get_ret_info(char *res_str, char *flag, char *password, char *msg)
Json::Reader json_reader;
if(json_reader.parse(res_str, json_value))
std::string flag1 = json_value["id"].asString();
std::string msg1 = json_value["msg"].asString();
strcpy(flag, flag1.c_str());
strcpy(msg, msg1.c_str());
}
int main(int argc, char *argv[])
char url[100] = "http://172.16.10.138:8888/ServerX/doRecog"; //服务端url
char *res_str; //返回数据
//构造json格式的参数
item["username"] = Json::Value("test");
item["signdata"] = Json::Value("NULL");
item["imgtype"] = Json::Value("jpg");
std::string str = item.toStyledString();
strcpy(param, );
res_str = send_post(url, (char*)str.c_str());
char password[30] = {0};
get_ret_info(res_str, flag, password, msg);
三、编译
g++ -c getInfo.cpp -o getInfo.o
自动编译
CC=g++
CFLAGS=-Wall -DLDAP_DEPRECATED=1 -I ./include/
ARCH=$(shell getconf LONG_BIT)
ifeq ($(DBGEN),1)
endif
ifeq ($(ARCH),32)
BINDIR = ./
else
BINDIR = ./
endif
BINLIBS=-L $(LIBDIR) -lcurl -ljson
EXENAME1=getPasswd
EXEEXT=.exe
TARGETBIN1 = $(EXENAME1)$(DEBUG)$(EXEEXT)
BINOBJS1 = getPasswd.o
all: $(TARGETBIN1)
.cpp.o:
$(CC) $(CFLAGS) $(XFLAGS) -c $< -o $@
.cpp.b:
$(CC) $(CFLAGS) $(XFLAGS) -c $< -o $@
$(TARGETBIN1): $(BINOBJS1)
$(LD) -o $(BINDIR)$(TARGETBIN1) $(BINOBJS1) $(BINLIBS)
clean:
rm -f *.o $(BINDIR)$(TARGETBIN1)
