(C) REST Stream Multipart Body from File

Demonstrates how to send a multipart/form-data HTTP request, where one of the parts contains data streamed directly from a file. This is good for cases where the file to be uploaded is very large.

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#include <C_CkRest.h>
#include <C_CkStringBuilder.h>
#include <C_CkStream.h>

void ChilkatSample(void)
    {
    HCkRest rest;
    BOOL bTls;
    int port;
    BOOL bAutoReconnect;
    BOOL success;
    HCkStringBuilder sbHtml;
    HCkStream fileStream;
    const char *responseBody;

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

    rest = CkRest_Create();

    // Connect to the destination web server.
    bTls = TRUE;
    port = 443;
    bAutoReconnect = TRUE;
    success = CkRest_Connect(rest,"www.somewebserver.com",port,bTls,bAutoReconnect);

    // This example will send the following multipart/form-data request.
    // The Content-Length is automatically computed and added by Chilkat.

    // 	POST /some_path HTTP/1.1
    // 	Content-Type: multipart/form-data; boundary=---------------------------735323031399963166993862150
    // 	Content-Length: 834
    // 
    // 	-----------------------------735323031399963166993862150
    // 	Content-Disposition: form-data; name="text1"
    // 
    // 	text 123 abc
    // 	-----------------------------735323031399963166993862150
    // 	Content-Disposition: form-data; name="text2"
    // 
    // 	xyz
    // 	-----------------------------735323031399963166993862150
    // 	Content-Disposition: form-data; name="file1"; filename="a.txt"
    // 	Content-Type: text/plain
    // 
    // 	Content of a.txt.
    // 
    // 	-----------------------------735323031399963166993862150
    // 	Content-Disposition: form-data; name="file2"; filename="a.html"
    // 	Content-Type: text/html
    // 
    // 	<!DOCTYPE html><title>Content of a.html.</title>
    // 
    // 	-----------------------------735323031399963166993862150
    // 	Content-Disposition: form-data; name="file3"; filename="starfish.jpg"
    // 	Content-Type: image/jpeg
    // 
    // 	binary data goes here
    // 	-----------------------------735323031399963166993862150--

    // Set the Content-Type for the topmost MIME part.
    CkRest_AddHeader(rest,"Content-Type","multipart/form-data");

    // Specify each part of the request.
    CkRest_putPartSelector(rest,"1");
    CkRest_AddHeader(rest,"Content-Disposition","form-data; name=\"text1\"");
    CkRest_SetMultipartBodyString(rest,"text 123 abc");

    CkRest_putPartSelector(rest,"2");
    CkRest_AddHeader(rest,"Content-Disposition","form-data; name=\"text2\"");
    CkRest_SetMultipartBodyString(rest,"xyz");

    CkRest_putPartSelector(rest,"3");
    CkRest_AddHeader(rest,"Content-Disposition","form-data; name=\"file1\"; filename=\"a.txt\"");
    CkRest_AddHeader(rest,"Content-Type","text/plain");
    CkRest_SetMultipartBodyString(rest,"Content of a.txt.");

    CkRest_putPartSelector(rest,"4");
    CkRest_AddHeader(rest,"Content-Disposition","form-data; name=\"file2\"; filename=\"a.html\"");
    CkRest_AddHeader(rest,"Content-Type","text/html");
    sbHtml = CkStringBuilder_Create();
    CkStringBuilder_LoadFile(sbHtml,"qa_data/html/a.html","utf-8");
    CkRest_SetMultipartBodySb(rest,sbHtml);

    CkRest_putPartSelector(rest,"5");
    CkRest_AddHeader(rest,"Content-Disposition","form-data; name=\"file3\"; filename=\"starfish.jpg\"");
    CkRest_AddHeader(rest,"Content-Type","image/jpeg");

    // When the request is sent, stream this part directly from the file.
    // This avoids having to load the entire file into memory.
    fileStream = CkStream_Create();
    CkStream_putSourceFile(fileStream,"qa_data/jpg/starfish.jpg");
    CkRest_SetMultipartBodyStream(rest,fileStream);

    responseBody = CkRest_fullRequestMultipart(rest,"POST","/some_path");
    if (CkRest_getLastMethodSuccess(rest) != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        CkStringBuilder_Dispose(sbHtml);
        CkStream_Dispose(fileStream);
        return;
    }

    // ...
    // ...

    // Clear the REST object for any subsequent requests..
    CkRest_ClearAllHeaders(rest);
    CkRest_ClearAllParts(rest);
    CkRest_putPartSelector(rest,"");


    CkRest_Dispose(rest);
    CkStringBuilder_Dispose(sbHtml);
    CkStream_Dispose(fileStream);

    }