C

Parse Multipart Binary Http Response

See more HTTP Examples

This example demonstrates how to parse an HTTP response that is multipart and contains a binary file, such as a .zip or .pdf. C

#include <C_CkHttp.h>
#include <C_CkHttpRequest.h>
#include <C_CkHttpResponse.h>
#include <C_CkBinData.h>
#include <C_CkMime.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkHttp http;
    HCkHttpRequest req;
    HCkHttpResponse resp;
    HCkBinData respBody;
    HCkMime mime;
    int numParts;
    HCkMime part0;
    const char *xmlStr;
    HCkMime part1;
    HCkBinData zipData;

    success = FALSE;

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

    http = CkHttp_Create();
    req = CkHttpRequest_Create();

    // ...
    // Insert code here to construct some kind of HTTP request.
    // this example is to show how to parse a particular kind of response.
    // ...
    // ...

    // Send the request (whatever it may be in your case) to get the HTTP response object.
    resp = CkHttpResponse_Create();
    success = CkHttp_HttpSReq(http,"www.somedomain.com",443,TRUE,req,resp);
    if (success == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        CkHttpResponse_Dispose(resp);
        return;
    }

    // Get the response body (which is expected to be binary)
    respBody = CkBinData_Create();
    CkHttpResponse_GetBodyBd(resp,respBody);

    // For this example, the response body contains something like this:

    // ------=_Part_21302_2029949381.1547401515443
    // Content-Type: application/xop+xml; charset=UTF-8; type="text/xml"
    // Content-Transfer-Encoding: 8bit
    // Content-ID: <rootpart@ws.jboss.org>
    // 
    // <env:Envelope xmlns:env='http://schemas.xmlsoap.org/soap/envelope/'><env:Header></env:Header><env:Body>...</env:Body></env:Envelope>
    // ------=_Part_21302_2029949381.1547401515443
    // Content-Type: application/octet-stream
    // Content-Transfer-Encoding: binary
    // Content-Id: <fileArchivio-7d302908-4d64-43d3-bf4e-79ce806d43b3@ws.jboss.org>
    // 
    // BINARY_CONTENT_HERE...
    // 
    // ------=_Part_21302_2029949381.1547401515443--
    // 

    // Load it into a Chilkat MIME object.
    mime = CkMime_Create();
    success = CkMime_LoadMimeBd(mime,respBody);
    if (success == FALSE) {
        printf("%s\n",CkMime_lastErrorText(mime));
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        CkHttpResponse_Dispose(resp);
        CkBinData_Dispose(respBody);
        CkMime_Dispose(mime);
        return;
    }

    numParts = CkMime_getNumParts(mime);
    if (numParts < 2) {
        printf("Expected multipart MIME with at least 2 sub-parts.\n");
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        CkHttpResponse_Dispose(resp);
        CkBinData_Dispose(respBody);
        CkMime_Dispose(mime);
        return;
    }

    // Get the 1st sub-part, which is the XML.

    part0 = CkMime_Create();
    CkMime_PartAt(mime,0,part0);

    // Should be OK because we checked NumParts above..
    xmlStr = CkMime_getBodyDecoded(part0);
    printf("%s\n",xmlStr);
    printf("----\n");

    // Save the 2nd part to a file.  (It is a .zip file in our test case..)

    part1 = CkMime_Create();
    CkMime_PartAt(mime,1,part1);

    success = CkMime_SaveBody(part1,"qa_output/attachedZip.zip");

    // Alternatively, we could extract the binary data to a BinData and use elsewhere..
    zipData = CkBinData_Create();
    success = CkMime_GetBodyBd(part1,zipData);
    success = CkBinData_WriteFile(zipData,"qa_output/attachedZip_again.zip");

    printf("OK.\n");


    CkHttp_Dispose(http);
    CkHttpRequest_Dispose(req);
    CkHttpResponse_Dispose(resp);
    CkBinData_Dispose(respBody);
    CkMime_Dispose(mime);
    CkMime_Dispose(part0);
    CkMime_Dispose(part1);
    CkBinData_Dispose(zipData);

    }