Unicode 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. Unicode C

#include <C_CkHttpW.h>
#include <C_CkHttpRequestW.h>
#include <C_CkHttpResponseW.h>
#include <C_CkBinDataW.h>
#include <C_CkMimeW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkHttpW http;
    HCkHttpRequestW req;
    HCkHttpResponseW resp;
    HCkBinDataW respBody;
    HCkMimeW mime;
    int numParts;
    HCkMimeW part0;
    const wchar_t *xmlStr;
    HCkMimeW part1;
    HCkBinDataW zipData;

    success = FALSE;

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

    http = CkHttpW_Create();
    req = CkHttpRequestW_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 = CkHttpResponseW_Create();
    success = CkHttpW_HttpSReq(http,L"www.somedomain.com",443,TRUE,req,resp);
    if (success == FALSE) {
        wprintf(L"%s\n",CkHttpW_lastErrorText(http));
        CkHttpW_Dispose(http);
        CkHttpRequestW_Dispose(req);
        CkHttpResponseW_Dispose(resp);
        return;
    }

    // Get the response body (which is expected to be binary)
    respBody = CkBinDataW_Create();
    CkHttpResponseW_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 = CkMimeW_Create();
    success = CkMimeW_LoadMimeBd(mime,respBody);
    if (success == FALSE) {
        wprintf(L"%s\n",CkMimeW_lastErrorText(mime));
        CkHttpW_Dispose(http);
        CkHttpRequestW_Dispose(req);
        CkHttpResponseW_Dispose(resp);
        CkBinDataW_Dispose(respBody);
        CkMimeW_Dispose(mime);
        return;
    }

    numParts = CkMimeW_getNumParts(mime);
    if (numParts < 2) {
        wprintf(L"Expected multipart MIME with at least 2 sub-parts.\n");
        CkHttpW_Dispose(http);
        CkHttpRequestW_Dispose(req);
        CkHttpResponseW_Dispose(resp);
        CkBinDataW_Dispose(respBody);
        CkMimeW_Dispose(mime);
        return;
    }

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

    part0 = CkMimeW_Create();
    CkMimeW_PartAt(mime,0,part0);

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

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

    part1 = CkMimeW_Create();
    CkMimeW_PartAt(mime,1,part1);

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

    // Alternatively, we could extract the binary data to a BinData and use elsewhere..
    zipData = CkBinDataW_Create();
    success = CkMimeW_GetBodyBd(part1,zipData);
    success = CkBinDataW_WriteFile(zipData,L"qa_output/attachedZip_again.zip");

    wprintf(L"OK.\n");


    CkHttpW_Dispose(http);
    CkHttpRequestW_Dispose(req);
    CkHttpResponseW_Dispose(resp);
    CkBinDataW_Dispose(respBody);
    CkMimeW_Dispose(mime);
    CkMimeW_Dispose(part0);
    CkMimeW_Dispose(part1);
    CkBinDataW_Dispose(zipData);

    }