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Delphi DLL Examples

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(Delphi DLL) Upload String to Dropbox

Uploads a string to a file on Dropbox. This example can upload content up to 150MB, assuming a 150MB string fits in memory for your app. Larger files must be uploaded with an upload session (upload_session/start).

Chilkat for Delphi Downloads

Chilkat non-ActiveX DLL for Delphi

Chilkat ActiveX DLL for Delphi

* The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Rest, DtObj, JsonObject, CkDateTime;

...

procedure TForm1.Button1Click(Sender: TObject);
var
rest: HCkRest;
success: Boolean;
content: PWideChar;
json: HCkJsonObject;
responseStr: PWideChar;
jsonResp: HCkJsonObject;
size: Integer;
rev: PWideChar;
clientModified: PWideChar;
ckdt: HCkDateTime;
bLocalTime: Boolean;
dt: HCkDtObj;

begin
//  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.

rest := CkRest_Create();

//  Connect to Dropbox
success := CkRest_Connect(rest,'content.dropboxapi.com',443,True,True);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

//  Add request headers.
CkRest_AddHeader(rest,'Content-Type','application/octet-stream');
CkRest_AddHeader(rest,'Authorization','Bearer DROPBOX_ACCESS_TOKEN');

//  The upload "parameters" contained in JSON passed in an HTTP request header.
//  This is the JSON to be added in this example:
//  {
//     "path": "/jack.txt",
//     "mode": "add",
//     "autorename": true,
//     "mute": false
//  }

//  This will be the content of the file created in Dropbox.
content := 'All work and no play makes Jack a dull boy';

json := CkJsonObject_Create();
CkJsonObject_AppendString(json,'path','/jack.txt');
CkJsonObject_AppendString(json,'mode','add');
CkJsonObject_AppendBool(json,'autorename',True);
CkJsonObject_AppendBool(json,'mute',False);
CkRest_AddHeader(rest,'Dropbox-API-Arg',CkJsonObject__emit(json));

//  Do the upload.  The URL is https://content.dropboxapi.com/2/files/upload.
//  We already connected to content.dropboxapi.com using TLS (i.e. HTTPS),
//  so now we only need to specify the path "/2/files/upload".

responseStr := CkRest__fullRequestString(rest,'POST','/2/files/upload',content);
if (CkRest_getLastMethodSuccess(rest) <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

//  When successful, Dropbox responds with a 200 response code.
if (CkRest_getResponseStatusCode(rest) <> 200) then
  begin
    //  Examine the request/response to see what happened.
    Memo1.Lines.Add('response status code = ' + IntToStr(CkRest_getResponseStatusCode(rest)));
    Memo1.Lines.Add('response status text = ' + CkRest__responseStatusText(rest));
    Memo1.Lines.Add('response header: ' + CkRest__responseHeader(rest));
    Memo1.Lines.Add('response body (if any): ' + responseStr);
    Memo1.Lines.Add('---');
    Memo1.Lines.Add('LastRequestStartLine: ' + CkRest__lastRequestStartLine(rest));
    Memo1.Lines.Add('LastRequestHeader: ' + CkRest__lastRequestHeader(rest));
    Exit;
  end;
Memo1.Lines.Add('LastRequestHeader: ' + CkRest__lastRequestHeader(rest));

//  The response is JSON.
jsonResp := CkJsonObject_Create();
CkJsonObject_putEmitCompact(jsonResp,False);
CkJsonObject_Load(jsonResp,responseStr);

//  Show the JSON response.
Memo1.Lines.Add(CkJsonObject__emit(jsonResp));

//  Returns JSON that 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
// }

//  Sample code to get data from the JSON response:
size := CkJsonObject_IntOf(jsonResp,'size');
Memo1.Lines.Add('size = ' + IntToStr(size));

rev := CkJsonObject__stringOf(jsonResp,'rev');
Memo1.Lines.Add('rev = ' + rev);

clientModified := CkJsonObject__stringOf(jsonResp,'client_modified');
ckdt := CkDateTime_Create();
CkDateTime_SetFromTimestamp(ckdt,clientModified);
bLocalTime := True;
dt := CkDateTime_GetDtObj(ckdt,bLocalTime);
Memo1.Lines.Add(IntToStr(CkDtObj_getDay(dt)) + '/' + IntToStr(CkDtObj_getMonth(dt)) + '/' + IntToStr(CkDtObj_getYear(dt)) + ' '
     + IntToStr(CkDtObj_getHour(dt)) + ':' + IntToStr(CkDtObj_getMinute(dt)));
CkDtObj_Dispose(dt);

CkRest_Dispose(rest);
CkJsonObject_Dispose(json);
CkJsonObject_Dispose(jsonResp);
CkDateTime_Dispose(ckdt);

end;

 

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