Send a Staged Multipart REST Request

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Demonstrates Rest.SendReqMultipart, which sends a multipart request using the parts configured on the object, then reads the response in separate steps.

Background. The staged request model separates sending from reading: a SendReq method transmits the request, ReadResponseHeader reads the status line and headers, and a ReadResp method reads the body. This gives fine control over large or streamed messages compared with the single-call full-request methods.

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#include <C_CkRest.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkRest rest;
    BOOL bTls;
    BOOL bAutoReconnect;
    int statusCode;
    const char *responseBody;

    success = FALSE;

    rest = CkRest_Create();
    bTls = TRUE;
    bAutoReconnect = TRUE;
    success = CkRest_Connect(rest,"example.com",443,bTls,bAutoReconnect);
    if (success == FALSE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        return;
    }

    //  Configure one multipart part before sending.
    CkRest_putPartSelector(rest,"1");
    CkRest_AddHeader(rest,"Content-Type","text/plain");
    CkRest_AddHeader(rest,"Content-Disposition","form-data; name=\"field1\"");
    success = CkRest_SetMultipartBodyString(rest,"value1");
    if (success == FALSE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        return;
    }

    //  Send the multipart request using the configured parts.
    success = CkRest_SendReqMultipart(rest,"POST","/api/upload");
    if (success == FALSE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        return;
    }

    //  After sending, read the response status line and header fields.  The return value is the HTTP
    //  status code, or -1 if no response was received.
    statusCode = CkRest_ReadResponseHeader(rest);
    if (statusCode < 0) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        return;
    }

    printf("Response status code: %d\n",statusCode);

    //  Read the response body as text.
    responseBody = CkRest_readRespBodyString(rest);
    if (CkRest_getLastMethodSuccess(rest) == FALSE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        return;
    }

    printf("%s\n",responseBody);


    CkRest_Dispose(rest);

    }