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Unicode C++ Examples

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(Unicode C++) Download File from Dropbox into a String Variable

Demonstrates how to download a file from Dropbox directly into a string variable.

Chilkat C/C++ Library Downloads

MS Visual C/C++

Linux/CentOS C/C++

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armhf/aarch64 C/C++

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#include <CkRestW.h>
#include <CkJsonObjectW.h>
#include <CkDateTimeW.h>
#include <CkDtObjW.h>

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

    //  A Dropbox access token should have been previously obtained.
    //  Dropbox access tokens do not expire.
    //  See Dropbox Access Token.

    CkRestW rest;

    //  Connect to Dropbox
    bool success = rest.Connect(L"content.dropboxapi.com",443,true,true);
    if (success != true) {
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    //  Add request headers.
    rest.AddHeader(L"Authorization",L"Bearer DROPBOX_ACCESS_TOKEN");

    //  The download "parameters" are contained in JSON passed in an HTTP request header.
    //  This is the JSON indicating the file to be downloaded:
    //  {
    //     "path": "/jack.txt",
    //  }

    CkJsonObjectW json;
    json.AppendString(L"path",L"/jack.txt");
    rest.AddHeader(L"Dropbox-API-Arg",json.emit());

    //  The content of the file on Dropbox is returned.
    const wchar_t *fileContent = rest.fullRequestNoBody(L"POST",L"/2/files/download");
    if (rest.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    //  When successful, Dropbox responds with a 200 response code.
    if (rest.get_ResponseStatusCode() != 200) {
        //  Examine the request/response to see what happened.
        wprintf(L"response status code = %d\n",rest.get_ResponseStatusCode());
        wprintf(L"response status text = %s\n",rest.responseStatusText());
        wprintf(L"response header: %s\n",rest.responseHeader());
        wprintf(L"response body (if any): %s\n",fileContent);
        wprintf(L"---\n");
        wprintf(L"LastRequestStartLine: %s\n",rest.lastRequestStartLine());
        wprintf(L"LastRequestHeader: %s\n",rest.lastRequestHeader());
        return;
    }

    //  Show the file content that was downloaded:
    wprintf(L"%s\n",fileContent);
    wprintf(L"----\n");

    //  Information about the downloaded file is also available as JSON in a response header.
    //  The "dropbox-api-result" response header contains the information.  For example:
    const wchar_t *apiResult = rest.responseHdrByName(L"dropbox-api-result");
    wprintf(L"%s\n",apiResult);

    //  In this case, the pretty-formatted dropbox-api-result JSON looks like this:
    //  {
    //    "name": "jack.txt",
    //    "path_lower": "/jack.txt",
    //    "path_display": "/jack.txt",
    //    "id": "id:yqx4-tE_NKAAAAAAAAAAAQ",
    //    "client_modified": "2016-06-02T20:42:11Z",
    //    "server_modified": "2016-06-02T20:42:11Z",
    //    "rev": "8482db15f",
    //    "size": 42
    //  }

    //  Load the JSON, pretty-print it, and demonstrate how to get some values...
    CkJsonObjectW jsonResult;
    jsonResult.put_EmitCompact(false);
    jsonResult.Load(apiResult);
    //  Show the JSON pretty-printed...
    wprintf(L"%s\n",jsonResult.emit());

    //  Sample code to get data from the JSON response:
    int size = jsonResult.IntOf(L"size");
    wprintf(L"size = %d\n",size);

    const wchar_t *rev = jsonResult.stringOf(L"rev");
    wprintf(L"rev = %s\n",rev);

    const wchar_t *clientModified = jsonResult.stringOf(L"client_modified");
    CkDateTimeW ckdt;
    ckdt.SetFromTimestamp(clientModified);
    bool bLocalTime = true;
    CkDtObjW *dt = ckdt.GetDtObj(bLocalTime);
    wprintf(L"%d/%d/%d %d:%d\n",dt->get_Day(),dt->get_Month(),dt->get_Year(),dt->get_Hour(),dt->get_Minute());
    delete dt;

    }

 

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