Delphi DLL

Box.com Upload File

See more Box Examples

Demonstrates how to upload a file to box.com. Delphi DLL

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, OAuth2, Rest, BinData, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
rest: HCkRest;
oauth2: HCkOAuth2;
bAutoReconnect: Boolean;
jsonAttr: HCkJsonObject;
fileDataObj: HCkBinData;
responseBody: PWideChar;

begin
success := False;

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

// ------------------------------------------------------------------------------------------
// Important:
// See this information about Box.com Service Accounts
// Box.com will automatically generate a Service Account where the name of the account is the name of your App.� 
// When you make API calls, it is for this service account, and the files that exist and what you see are not the same as your normal account.
// ------------------------------------------------------------------------------------------

rest := CkRest_Create();

//   Provide a previously obtained OAuth2 access token.
oauth2 := CkOAuth2_Create();
CkOAuth2_putAccessToken(oauth2,'BOX_ACCESS_TOKEN');
CkRest_SetAuthOAuth2(rest,oauth2);

// First, make the initial connection.
// A single REST object, once connected, can be used for many Box REST API calls.
// The auto-reconnect indicates that if the already-established HTTPS connection is closed,
// then it will be automatically re-established as needed.
bAutoReconnect := True;

// ----------------------------------------------------------------------
// IMPORTANT: Note that the domain is "upload.box.com", not "api.box.com"
// ----------------------------------------------------------------------
success := CkRest_Connect(rest,'upload.box.com',443,True,bAutoReconnect);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

// The request body uses the "multipart/form-data" format to transmit two "parts". 
// The first part is called "attributes" and contains a JSON object with information about the file, including the name of the file 
// and the ID of the parent folder. The second part contains the contents of the file. 
// (Note that the name of the second "part" is ignored.)

CkRest_AddHeader(rest,'Content-Type','multipart/form-data');

// Provide the content for each part of the request...

// First the JSON attributes.  Use "0" for the root folder.
//   {"name":"penguins.jpg", "parent":{"id":"0"}}
jsonAttr := CkJsonObject_Create();
CkJsonObject_UpdateString(jsonAttr,'name','penguins.jpg');
CkJsonObject_UpdateString(jsonAttr,'parent.id','0');

CkRest_putPartSelector(rest,'1');
CkRest_AddHeader(rest,'Content-Disposition','form-data; name="attributes"; ');
CkRest_SetMultipartBodyString(rest,CkJsonObject__emit(jsonAttr));

CkRest_putPartSelector(rest,'2');
CkRest_AddHeader(rest,'Content-Disposition','form-data; name="file"; filename="penguins.jpg"');
// "application/octet-stream" can be safely used for any type file..
CkRest_AddHeader(rest,'Content-Type','application/octet-stream');

// Load the file into a binary data object, and then upload..
fileDataObj := CkBinData_Create();
CkBinData_LoadFile(fileDataObj,'qa_data/jpg/penguins.jpg');
CkRest_SetMultipartBodyBd(rest,fileDataObj);

// Restore the PartSelector to "0" (for safety, in case something else sends another request on this object)
CkRest_putPartSelector(rest,'0');

// Send the multipart/form-data request, which uploads the file contained in fileDataObj
responseBody := CkRest__fullRequestMultipart(rest,'POST','/api/2.0/files/content');
if (CkRest_getLastMethodSuccess(rest) <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

// A 201 is received for a successful upload
if (CkRest_getResponseStatusCode(rest) <> 201) then
  begin
    Memo1.Lines.Add('Box.com upload failed.');
    Memo1.Lines.Add('Request header:');
    Memo1.Lines.Add(CkRest__lastRequestHeader(rest));
    Memo1.Lines.Add('---');
    Memo1.Lines.Add('Response status code = ' + IntToStr(CkRest_getResponseStatusCode(rest)));
    Memo1.Lines.Add('Response body:');
    Memo1.Lines.Add(responseBody);
    Exit;
  end;

Memo1.Lines.Add('File uploaded.');

CkRest_Dispose(rest);
CkOAuth2_Dispose(oauth2);
CkJsonObject_Dispose(jsonAttr);
CkBinData_Dispose(fileDataObj);

end;