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));