WinInet只下载网页的一部分



我有一个将网页下载到文本文件中的功能

#include <iostream>
#include <string>
#include <fstream>
#include <Windows.h>
#include <WinINet.h>
#pragma comment(lib, "WinINet.lib")
void Download(wstring url)
{
std::ofstream fout(L"temp.txt");
HINTERNET hopen = InternetOpen(L"MyAppName",
INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
if (hopen)
{
DWORD flags = INTERNET_FLAG_DONT_CACHE;
if (url.find(L"https://") == 0)
flags |= INTERNET_FLAG_SECURE;
HINTERNET hinternet = InternetOpenUrl(hopen, url.c_str(), NULL, 0, flags, 0);
if (hinternet)
{
char buf[1024];
DWORD received = 0;
while (InternetReadFile(hinternet, buf, sizeof(buf), &received))
{
if (!received) break;
fout.write(buf, received);
}
InternetCloseHandle(hinternet);
}
InternetCloseHandle(hopen);
}
return;
}

当我给它"https://camelcamelcamel.com/Lodge-LMS3-Miniature-Skillet/product/B000LXA9YI"作为参数时只是输出 https://hastebin.com/gilomexomu.xml(太大,不能放在这里( 这切断了大部分网页。我不确定网站上是否有一些反下载脚本,或者它是否太大了。

这不是你的代码。是网站。 我相信它只能提供 gzip 压缩数据。 否则,它会在几 kb 的数据后爆炸。 curl 显示网站正在过早中止传输:

$ curl https://camelcamelcamel.com/Lodge-LMS3-Miniature-Skillet/product/B000LXA9YI -o text.txt
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
Dload  Upload   Total   Spent    Left  Speed
100 15725    0 15725    0     0   4702      0 --:--:--  0:00:03 --:--:--  4702
curl: (18) transfer closed with outstanding read data remaining

所以我做了两件事来更好地用你的代码模拟 Web 浏览器

  1. 放置与浏览器完全相同的标头和用户代理。
  2. 由于这个网站似乎只想返回 gzip 编码,我不得不调整您的文件保存代码另存为二进制而不是文本(这会导致 Windows CRT 错误地"修复"换行符字符(。

然后要解码整个 HTML,我只需从 Bash 命令提示符运行它:

gunzip < temp.txt > temp_final.txt

结果是temp_final.txt具有整个 html 响应。

以下是调整后的代码:

#include <iostream>
#include <string>
#include <fstream>
#include <Windows.h>
#include <WinINet.h>
#pragma comment(lib, "WinINet.lib")
void Download(const std::wstring& url)
{
FILE* file = fopen("temp.txt", "wb");
HINTERNET hopen = InternetOpen(L"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36",
INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
if (hopen)
{
DWORD flags = INTERNET_FLAG_DONT_CACHE;
if (url.find(L"https://") == 0)
flags |= INTERNET_FLAG_SECURE;
LPCWSTR headers = L"User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36rn"
L"DNT: 1rn"
L"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8rn"
L"Accept-Encoding: gzip, deflate, brrn"
L"Accept-Language: en-US,en;q=0.9rn";

HINTERNET hinternet = InternetOpenUrl(hopen, url.c_str(), headers, 0, flags, 0);
if (hinternet)
{
char buf[1024+1]={};
DWORD received = 0;
while (InternetReadFile(hinternet, buf, 1024, &received))
{
if (!received) break;
printf("%dn", received);
fwrite(buf, 1, received, file);
}
InternetCloseHandle(hinternet);
}
InternetCloseHandle(hopen);
}
return;
}
void main()
{
Download(L"https://camelcamelcamel.com/Lodge-LMS3-Miniature-Skillet/product/B000LXA9YI");
}

我尝试取出接受编码或将其设置为"身份"。结果是服务器发回半页然后中止。

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