(MFC) Google Drive Multipart Upload String

Demonstrates a file upload to Google Drive where the contents of the file are contained in a string variable.

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

See Also: Using MFC CString in Chilkat

#include <CkAuthGoogle.h>
#include <CkRest.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // This example will upload a file to Google Drive.
    bool success = true;

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

    CkAuthGoogle gAuth;
    gAuth.put_Scope("https://www.googleapis.com/auth/drive");
    gAuth.put_SubEmailAddress("some.user@example.com");
    gAuth.put_ExpireNumSeconds(3600);

    // Obtain an access token as shown in one of the following examples:
    // See Get Access Token using a Service Account JSON Key
    // See Get Access Token using a P12 File

    CkRest rest;

    // Connect using TLS.
    bool bAutoReconnect = true;
    success = rest.Connect("www.googleapis.com",443,true,bAutoReconnect);

    // Provide the authentication credentials (i.e. the access key)
    success = rest.SetAuthGoogle(gAuth);

    // A multipart upload to Google Drive needs a multipart/related Content-Type
    success = rest.AddHeader("Content-Type","multipart/related");

    // Specify each part of the request.

    // The 1st part is JSON with information about the file.
    rest.put_PartSelector("1");
    success = rest.AddHeader("Content-Type","application/json; charset=UTF-8");

    CkJsonObject json;
    success = json.AddStringAt(-1,"title","helloWorld.txt");
    success = json.AddStringAt(-1,"description","A simple text file that says Hello World.");
    success = json.AddStringAt(-1,"mimeType","text/plain");
    success = rest.SetMultipartBodyString(json.emit());

    // The 2nd part is the file content.
    // In this case, we'll upload a simple text file containing "Hello World!"
    rest.put_PartSelector("2");
    success = rest.AddHeader("Content-Type","text/plain");
    success = rest.SetMultipartBodyString("Hello World!");

    // POST https://www.googleapis.com/upload/drive/v2/files
    const char *jsonResponse = rest.fullRequestMultipart("POST","/upload/drive/v2/files?uploadType=multipart");
    if (rest.get_LastMethodSuccess() != true) {
        strOut.append(rest.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Show the JSON response.
    strOut.append("Response Status Code: ");
    strOut.appendInt(rest.get_ResponseStatusCode());
    strOut.append("\r\n");
    strOut.append("Json Response: ");
    strOut.append(jsonResponse);
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }