C++

Fetch Web Pages from Local Cache

See more HTTP Examples

Demonstrates how to keep a local cache to avoid re-fetching web pages. C++

#include <CkHttp.h>

void ChilkatSample(void)
    {
    //  This example assumes the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    CkHttp http;

    //  Define a cache directory and set the number of levels based on the anticipated size of the cache.
    http.AddCacheRoot("c:/example/httpCache/");

    //  up to 256 sub-directories under the cache root will be created as needed to hold cached GET's.
    http.put_NumCacheLevels(1);

    //  Tell the http object to fetch from the cache if possible.
    http.put_FetchFromCache(true);

    //  Also tell the http object to update the cache with newly fetched pages.
    http.put_UpdateCache(true);

    //  This HTTP GET should result in a cache file getting created.
    const char *html = http.quickGetStr("https://www.google.com/");
    if (http.get_LastMethodSuccess() == false) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    //  The 1st GET was not from cache:
    std::cout << "Fetched from cache: " << http.get_LastFromCache() << "\r\n";

    //  Fetching again will cause the page to be delivered from our local cache.
    html = http.quickGetStr("https://www.google.com/");
    if (http.get_LastMethodSuccess() == false) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    //  The 2nd GET is from cache:
    std::cout << "Fetched from cache: " << http.get_LastFromCache() << "\r\n";
    }