c++实现查询天气预报

来源：互联网发布：怎么给淘宝客服发链接? 编辑：程序博客网时间：2024/05/03 22:31

用到的函数、API等

1、中央气象台API返回的JSON数据（http://m.weather.com.cn/data/101010100.html）

2、外网获取IP（http://ip.dnsexit.com/index.php）

3、Sqlite（1中的城市代号利用sqlite3实现查询）

4、C++中GB2312字符串和UTF-8之间的转换（见这篇文章http://blog.csdn.net/lgh1992314/article/details/8579206）

5、Jsoncpp（主要是处理1中的数据==见这篇文章http://blog.csdn.net/lgh1992314/article/details/8582179）

...

程序依赖于数据库中的城市以及城市代码的丰富度，所以有的城市可能会查询不到哦。

半成品：

[cpp] view plaincopy

#include <iostream>
#include <ctime>
#include <string>
#include <cstring>
#include <cstdlib>
#include <sstream>
#include <fstream>
#include <sqlite3.h>
#include <afxinet.h>
#include <windows.h>
#include<json.h>
#pragma comment(lib,"sqlite3.lib")
using namespace Json;
using namespace std;
std::string City_code;
int sqlite3_exec_callback(void *data, int n_columns, char **col_values, char **col_names)
{
//int i;
/*for(i=0; i < n_columns; i++)
{
cout << col_values[i] << "\t";
}
cout << endl;*/
City_code = col_values[0];
return 0;
}
std::string UtfToGb(std::string utf8)//UTF-8 to GB2312
{
int len = MultiByteToWideChar(CP_UTF8, 0, utf8.c_str(), -1, NULL, 0);
wchar_t* wstr = new wchar_t[len+1];
memset(wstr, 0, len+1);
MultiByteToWideChar(CP_UTF8, 0, utf8.c_str(), -1, wstr, len);
len = WideCharToMultiByte(CP_ACP, 0, wstr, -1, NULL, 0, NULL, NULL);
char* str = new char[len+1];
memset(str, 0, len+1);
WideCharToMultiByte(CP_ACP, 0, wstr, -1, str, len, NULL, NULL);
if(wstr) delete[] wstr;
std::string strs = (str);
delete []str;
return strs;
}
void jsonDate(string strValue) //Jsoncpp
{
//Json::StyledWriter style_write;
Json::Value value;
Json::Reader reader;
reader.parse(strValue, value);
//std::cout << style_write.write(value) << std::endl;
std::cout << value["weatherinfo"]["date_y"].asString() << " ";
std::cout << value["weatherinfo"]["week"].asString() << std::endl;
std::cout << "================================================" << std::endl;
std::cout << "= " << value["weatherinfo"]["temp1"].asString() << " " << " "
<< value["weatherinfo"]["weather1"].asString() << value["weatherinfo"]["wind1"].asString() << std::endl;
std::cout << "= " << value["weatherinfo"]["temp2"].asString() << " "
<< value["weatherinfo"]["weather2"].asString() << " " << value["weatherinfo"]["wind2"].asString() << std::endl;
std::cout << "= " << value["weatherinfo"]["temp3"].asString() << " "
<< value["weatherinfo"]["weather3"].asString() << " " << value["weatherinfo"]["wind3"].asString() << std::endl;
std::cout << "= " << value["weatherinfo"]["temp4"].asString() << " "
<< value["weatherinfo"]["weather4"].asString() << " " << value["weatherinfo"]["wind4"].asString() << std::endl;
std::cout << "= " << value["weatherinfo"]["temp5"].asString() << " "
<< value["weatherinfo"]["weather5"].asString() << " " << value["weatherinfo"]["wind5"].asString() << std::endl;
std::cout << "= " << value["weatherinfo"]["temp6"].asString() << " "
<< value["weatherinfo"]["weather6"].asString() << " " << value["weatherinfo"]["wind6"].asString() << std::endl;
std::cout << "================================================" << std::endl;
}
std::string GetIp()
{
CString url = "http://ip.dnsexit.com/";
CString content;
CString data;
DWORD dwStatusCode;
CInternetSession session("HttpClient");
CHttpFile* pfile = (CHttpFile *)session.OpenURL(url);
pfile -> QueryInfoStatusCode(dwStatusCode);
if(dwStatusCode == HTTP_STATUS_OK)
{
while (pfile -> ReadString(data))
{
content += data;
}
}
pfile -> Close();
delete pfile;
session.Close();
return std::string(content);
}
std::string GetProvince(std::string ip)
{
std::string url = "http://www.youdao.com/smartresult-xml/search.s?type=ip&q=";
url.append(ip);
CString content;
CString data;
DWORD dwStatusCode;
CInternetSession session("HttpClient");
CHttpFile* pfile = (CHttpFile *)session.OpenURL(url.c_str());
pfile -> QueryInfoStatusCode(dwStatusCode);
if(dwStatusCode == HTTP_STATUS_OK)
{
while (pfile -> ReadString(data))
{
content += data;
}
}
pfile -> Close();
delete pfile;
session.Close();
std::string result = std::string(content);
int left = result.find("<location>");
int right = result.find("</location>");
//cout << left << "\t" << right << endl;
std::string province = result.substr(left + 10,right - left - 10 - 5);
return province;
}
std::string GetWeather(std::string city_code)
{
std::string url = "http://m.weather.com.cn/data/";
url.append(city_code);
url.append(".html");
CString content;
CString data;
DWORD dwStatusCode;
CInternetSession session("HttpClient");
CHttpFile* pfile = (CHttpFile *)session.OpenURL(url.c_str());
pfile -> QueryInfoStatusCode(dwStatusCode);
if(dwStatusCode == HTTP_STATUS_OK)
{
while (pfile -> ReadString(data))
{
content += data;
}
}
pfile -> Close();
delete pfile;
session.Close();
return UtfToGb(std::string(content));
}
void ShowWeather()
{
sqlite3 *db = NULL;
char *err_msg = NULL;
if(SQLITE_OK != sqlite3_open("weather.db",&db))
{
std::cout << "can't open the database." << std::endl;
exit(-1);
}
std::string province;
std::string ip = GetIp();
std::cout << "IP:" << ip << std::endl;
province = GetProvince(ip);
std::cout << "您所在的地方:" << province << std::endl;
std::cout << "您所在地天气:" << std::endl;
std::string city = province.substr(province.find("省") + 2,4);
std::string sql = "select city_code from weather where city = ";
sql.append("\"");
sql.append(city);
sql.append("\"");
sqlite3_exec(db, sql.c_str(), &sqlite3_exec_callback, 0, &err_msg);
string strValue = GetWeather(City_code);
jsonDate(strValue);
City_code.clear();
sqlite3_close(db);
}
int main()
{
ShowWeather();
sqlite3 *db = NULL;
char *err_msg = NULL;
if(SQLITE_OK != sqlite3_open("weather.db",&db))
{
std::cout << "can't open the database." << std::endl;
exit(-1);
}
std::string province;
std::string sql = "select city_code from weather where city = ";
std::cout << "please input the province" << std::endl;
std::cin >> province;
sql.append("\"");
sql.append(province);
sql.append("\"");
std::cout << "天气:" << std::endl;
sqlite3_exec(db, sql.c_str(), &sqlite3_exec_callback, 0, &err_msg);
string strValue = GetWeather(City_code);
jsonDate(strValue);
sqlite3_close(db);
return 0;
}

输出：

[plain] view plaincopy

IP:124.135.247.252
您所在的地方:山东省聊城市
您所在地天气:
2013年2月16日星期六
================================================
= 7℃~0℃ 多云转雨夹雪南风3-4级转小于3级
= 4℃~-3℃ 阴转小雪南风小于3级转北风4-5级
= 1℃~-7℃ 阴转多云北风3-4级转小于3级
= 3℃~-4℃ 晴南风小于3级
= 5℃~-4℃ 晴北风小于3级
= 7℃~-2℃ 晴南风小于3级
================================================
please input the province
北京
天气:
2013年2月16日星期六
================================================
= 2℃~-3℃ 阴转多云微风
= 6℃~-4℃ 多云转晴北风3-4级
= 3℃~-8℃ 晴北风3-4级转微风
= 3℃~-6℃ 晴微风
= 4℃~-6℃ 晴转多云微风
= 4℃~-5℃ 多云转晴微风
================================================
请按任意键继续. . .