Unicode C

Send a Staged REST Request from a StringBuilder

Demonstrates Rest.SendReqSb, which sends a request whose text body is read from a StringBuilder, 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.

Chilkat Unicode C Downloads

Download Chilkat for Unicode C

Unicode C

#include <C_CkRestW.h>
#include <C_CkStringBuilderW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkRestW rest;
    BOOL bTls;
    BOOL bAutoReconnect;
    HCkStringBuilderW sbBody;
    int statusCode;
    const wchar_t *responseBody;

    success = FALSE;

    rest = CkRestW_Create();
    bTls = TRUE;
    bAutoReconnect = TRUE;
    success = CkRestW_Connect(rest,L"example.com",443,bTls,bAutoReconnect);
    if (success == FALSE) {
        wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        CkRestW_Dispose(rest);
        return;
    }

    CkRestW_AddHeader(rest,L"Content-Type",L"application/json");

    //  Send a request whose text body is read from a StringBuilder.
    sbBody = CkStringBuilderW_Create();
    CkStringBuilderW_Append(sbBody,L"{ \"query\": \"chilkat\" }");
    success = CkRestW_SendReqSb(rest,L"POST",L"/api/search",sbBody);
    if (success == FALSE) {
        wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        CkRestW_Dispose(rest);
        CkStringBuilderW_Dispose(sbBody);
        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 = CkRestW_ReadResponseHeader(rest);
    if (statusCode < 0) {
        wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        CkRestW_Dispose(rest);
        CkStringBuilderW_Dispose(sbBody);
        return;
    }

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

    //  Read the response body as text.
    responseBody = CkRestW_readRespBodyString(rest);
    if (CkRestW_getLastMethodSuccess(rest) == FALSE) {
        wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        CkRestW_Dispose(rest);
        CkStringBuilderW_Dispose(sbBody);
        return;
    }

    wprintf(L"%s\n",responseBody);


    CkRestW_Dispose(rest);
    CkStringBuilderW_Dispose(sbBody);

    }