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 <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:/example/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);

    }