(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 <C_CkHttp.h>

void ChilkatSample(void)
    {
    HCkHttp http;
    const char *html;

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

    http = CkHttp_Create();

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

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

    // Tell the http object to fetch from the cache if possible.
    CkHttp_putFetchFromCache(http,TRUE);

    // Also tell the http object to update the cache with newly fetched pages.
    CkHttp_putUpdateCache(http,TRUE);

    // This HTTP GET should result in a cache file getting created.
    html = CkHttp_quickGetStr(http,"https://www.google.com/");
    if (CkHttp_getLastMethodSuccess(http) == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        return;
    }

    // The 1st GET was not from cache:
    printf("Fetched from cache: %d\n",CkHttp_getLastFromCache(http));

    // Fetching again will cause the page to be delivered from our local cache.
    html = CkHttp_quickGetStr(http,"https://www.google.com/");
    if (CkHttp_getLastMethodSuccess(http) == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        return;
    }

    // The 2nd GET is from cache:
    printf("Fetched from cache: %d\n",CkHttp_getLastFromCache(http));


    CkHttp_Dispose(http);

    }