C

Get the Last-Modified Date Before HTTP Download

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Demonstrates how to send a HEAD request to get the last-modified date of a file on a web server (without downloading the file). C

#include <C_CkHttp.h>
#include <C_CkHttpResponse.h>
#include <C_CkDateTime.h>
#include <C_CkDtObj.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkHttp http;
    HCkHttpResponse resp;
    const char *lastModStr;
    HCkDateTime ckdt;
    HCkDtObj dt;

    success = FALSE;

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

    http = CkHttp_Create();

    resp = CkHttpResponse_Create();
    success = CkHttp_HttpNoBody(http,"HEAD","https://www.chilkatsoft.com/hamlet.xml",resp);
    if (success == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkHttpResponse_Dispose(resp);
        return;
    }

    //  Examine the response header.
    printf("%s\n",CkHttpResponse_header(resp));

    //  Here is a sample response header:

    //  	Content-Length: 279658
    //  	Content-Type: text/xml
    //  	Last-Modified: Thu, 12 May 2016 15:14:08 GMT
    //  	Accept-Ranges: bytes
    //  	ETag: "c1cd8bee60acd11:0"
    //  	Server: Microsoft-IIS/8.5
    //  	X-Powered-By: ASP.NET
    //  	X-Powered-By-Plesk: PleskWin
    //  	Date: Thu, 25 Jul 2019 16:40:54 GMT

    //  Get the Last-Modified header.
    lastModStr = CkHttpResponse_getHeaderField(resp,"Last-Modified");
    //  If the header exists...
    if (CkHttpResponse_getLastMethodSuccess(resp) == TRUE) {
        //  Parse the RFC822 format date/time string
        ckdt = CkDateTime_Create();
        CkDateTime_SetFromRfc822(ckdt,lastModStr);

        //  If we want to access individual date/time parts (in the local timezone)
        dt = CkDtObj_Create();
        CkDateTime_ToDtObj(ckdt,TRUE,dt);

        printf("day/month/year = %d/%d/%d\n",CkDtObj_getDay(dt),CkDtObj_getMonth(dt),CkDtObj_getYear(dt));
    }



    CkHttp_Dispose(http);
    CkHttpResponse_Dispose(resp);
    CkDateTime_Dispose(ckdt);
    CkDtObj_Dispose(dt);

    }