(Unicode C++) Fetch Web Pages from Local Cache

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

Note: This example requires Chilkat v9.5.0.91 or later.

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#include <CkHttpW.h>

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

    CkHttpW http;

    // Define a cache directory and set the number of levels based on the anticipated size of the cache.
    http.AddCacheRoot(L"c:/AAWorkarea/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 wchar_t *html = http.quickGetStr(L"https://www.google.com/");
    if (http.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    // The 1st GET was not from cache:
    wprintf(L"Fetched from cache: %d\n",http.get_LastFromCache());

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

    // The 2nd GET is from cache:
    wprintf(L"Fetched from cache: %d\n",http.get_LastFromCache());
    }