利用MFC获取网页内容

#include <iostream>
#include <ctime>
#include <cstring>
#include <string>
#include <fstream>
#include <sstream>
#include <cstdlib>
#include <afxinet.h>
using namespace std;

string GetHtml(CString url)
{
	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 string(content.GetBuffer(content.GetLength()));
}

string GetHtmlPath(int y, int m, int d)
{
	stringstream str;
	string now;
	string path = "http://www.nod32jihuoma.cn/nod32-id/";

	str << y + 1900;
	str >> now;
	path.append(now);
	path.append("-");
	now.clear();
	str.clear();

	int month = m + 1;
	if(month / 10 == 0)
	{
		str << 0;
		str >> now;
		path.append(now);
		now.clear();
		str.clear();
	}
	str << month;
	str >> now;
	path.append(now);
	path.append("-");
	now.clear();
	str.clear();

	int day = d;
	if(day / 10 == 0)
	{
		str << 0;
		str >> now;
		path.append(now);
		now.clear();
		str.clear();
	}
	str << day;
	str >> now;
	path.append(now);
	path.append(".html");
	now.clear();
	str.clear();
	return path;
}

void SearchData(int n)
{
	ofstream cout("key.txt");
	const string key = "<div>用户名：";//13
	const string value = " 密  码：";//14
	time_t t = time(NULL);
	struct tm* cur = localtime(&t);
	int y = cur->tm_year;
	int m = cur->tm_mon;
	int d = cur->tm_mday;
	for(int i = 0 ; i < n; i++)
	{
		int dd = d - i;
		string path = GetHtmlPath(y, m, dd);
		cout << "获取网址" << "\n" << path << endl;
		CString url;
		url.Format("%s",path.c_str());
		string data = GetHtml(url);

		//cout << data << endl;

		cout << y + 1900 << "年" << m + 1 << "月" << dd << "日 " << endl; 
		cout << "用户名:           密码：" <<endl;
		for(size_t pos = 0; pos < data.size(); pos++)
		{
			size_t t = data.find(key,pos);
			if(t == string::npos)
				break;
			t += 13;
			for(int i = 1; i <= 14; i++,t++)
			{
				cout << data[t];
			}
			cout << "    ";
			t += 14;
			for(int i = 1; i <= 10; i++,t++)
			{
				cout << data[t];
			}
			pos = t;
			cout << endl;
		}
	}
	cout.close();
}

int main() 
{ 
	SearchData(2);
	
	string str;
	ifstream fin("key.txt");
	while(fin)
	{
		getline(fin,str);
		cout << str << endl;
		str.clear();
	}
	fin.close();
	system("pause");
	return 0;
}  

出现的问题：

1:、不能将参数 1 从“const char [11]”转换为“LPCTSTR”

将项目属性里的字符集改为多字符集即可。

2、Building MFC application with /MD[d] (CRT dll version)requires MFC shared dll version~~~~

将项目属性里的MFC的使用改为在共享DLL使用MFC

3、string/cstring的转化

1、string 转 CString
CString.format("%s", string.c_str());
2、char * 转 CString
CString.format("%s", char*);
3、char * 转 string
string s(char *);
4、string 转 char *
char *p = string.c_str();
5、CString 转 string
string s(CString.GetBuffer(CString.GetLength()));
6、CString 转 char *
charpoint=strtest.GetBuffer(strtest.GetLength());
不建议用(LPCTSTR)进行强制类型转化，这样strtest大小发生变化时会出现错误。
7、CString 转 char[100]
char a[100];
CString str("aaaaaa");
strncpy(a,(LPCTSTR)str,sizeof(a));