(MFC) HTTP multipart/form-data Upload

Demonstrates how to upload files to an HTTP server using a multipart/form-data POST.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkHttp.h>
#include <CkHttpRequest.h>
#include <CkHttpResponse.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkHttp http;

    CkHttpRequest req;
    req.put_HttpVerb("POST");
    req.put_ContentType("multipart/form-data");
    req.put_Path("rcvFormDataUpload.aspx");

    // Send an "Expect: 100-continue" header in the request.
    // This causes the HTTP server to end a 100-continue response
    // immediately after receiving the HTTP header.  The client
    // (Chilkat) will receive this intermediate response, and if
    // it's not an error response, it knows that the HTTP server will
    // accept the data that is forthcoming.
    // The alternative is to get an error response after trying to upload
    // the entire contents of the files.
    req.AddHeader("Expect","100-continue");

    // Call AddFileForUpload2 for each file to be uploaded in the HTTP multipart/form-data POST
    // To allow Chilkat to determine the content-type automatically based on file-extension,
    // call AddFileForUpload instead.

    // The 1st arg is the filename passed in the HTTP request.
    // The 2nd arg is the path in the local filesytem.
    // The file is not loaded into memory.  It is streamed directly from the file
    // when the HTTP POST is sent.
    bool success = req.AddFileForUpload2("starfish.jpg","c:/qa_data/starfish.jpg","image/jpg");
    if (success != true) {
        strOut.append(req.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    success = req.AddFileForUpload("something.pdf","c:/qa_data/something.pdf");
    if (success != true) {
        strOut.append(req.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Its also possible to add a file from a string:
    success = req.AddStringForUpload("test.xml","test.xml","<abc>This is the test.xml content</abc>","utf-8");
    // We'll assume success since no files are involved..

    // This sends the HTTP request (with 3 files being uploaded) to
    // http://www.mywebserver123abc.com/rcvFormDataUpload.aspx
    CkHttpResponse *resp = 0;
    resp = http.SynchronousRequest("www.mywebserver123abc.com",80,false,req);
    if (http.get_LastMethodSuccess() != true) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
    }
    else {
        strOut.append("HTTP response status: ");
        strOut.appendInt(resp->get_StatusCode());
        strOut.append("\r\n");
        // See the online reference documentation for 
        // other information that can be obtained from the response object.
        delete resp;
    }

    // To send using SSL/TLS, do this instead.
    // This sends to https://www.mywebserver123abc.com/rcvFormDataUpload.aspx
    resp = http.SynchronousRequest("www.mywebserver123abc.com",443,true,req);
    if (http.get_LastMethodSuccess() != true) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
    }
    else {
        strOut.append("HTTP response status: ");
        strOut.appendInt(resp->get_StatusCode());
        strOut.append("\r\n");
        // See the online reference documentation for 
        // other information that can be obtained from the response object.
        delete resp;
    }



    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }