Delphi DLL Requires Chilkat v11.0.0+
Upload String to Google Cloud Storage

Demonstrates how to upload an in-memory string to Google Cloud Storage.
Chilkat Delphi DLL Downloads

Delphi DLL
var
success: Boolean;
sbToken: HCkStringBuilder;
http: HCkHttp;
xml: HCkXml;
sbXml: HCkStringBuilder;
url: PWideChar;
resp: HCkHttpResponse;
responseCode: Integer;

begin
success := False;

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

//  This example uses a previously obtained access token having permission for the 
//  scope "https://www.googleapis.com/auth/cloud-platform"

//  In this example, Get Google Cloud Storage OAuth2 Access Token, 
//  the service account access token was saved to a text file.  This example fetches the access token from the file..
sbToken := CkStringBuilder_Create();
CkStringBuilder_LoadFile(sbToken,'qa_data/tokens/googleCloudStorageAccessToken.txt','utf-8');

//  Send a POST equivalent to this curl command.
//  The content of the file is contained in the request body.

//  curl -X POST --data-binary @[OBJECT] \
//      -H "Authorization: Bearer [OAUTH2_TOKEN]" \
//      -H "Content-Type: [OBJECT_CONTENT_TYPE]" \
//      "https://www.googleapis.com/upload/storage/v1/b/[BUCKET_NAME]/o?uploadType=media&name=[OBJECT_NAME]"

http := CkHttp_Create();
CkHttp_putAuthToken(http,CkStringBuilder__getAsString(sbToken));

//  Create an XML document, and write it to a StringBuilder.
//  We'll be uploading this XML document.
xml := CkXml_Create();
CkXml_putTag(xml,'note');
CkXml_UpdateChildContent(xml,'to','Tove');
CkXml_UpdateChildContent(xml,'from','Jani');
CkXml_UpdateChildContent(xml,'heading','Reminder');
CkXml_UpdateChildContent(xml,'body','Don''t forget me this weekend!');

//  Write the XML to sbXml.
sbXml := CkStringBuilder_Create();
CkXml_GetXmlSb(xml,sbXml);

//  sbXml contains this:

//  <note>
//      <to>Tove</to>
//      <from>Jani</from>
//      <heading>Reminder</heading>
//      <body>Don't forget me this weekend!</body>
//  </note>

//  Construct a URL to upload to an object named "test.xml" in the "chilkat-ocean" bucket.
CkHttp_SetUrlVar(http,'bucket_name','chilkat-ocean');
CkHttp_SetUrlVar(http,'object_name','test.xml');
url := 'https://www.googleapis.com/upload/storage/v1/b/{$bucket_name}/o?uploadType=media&name={$object_name}';

resp := CkHttpResponse_Create();
success := CkHttp_HttpSb(http,'POST',url,sbXml,'utf-8','application/xml',resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

responseCode := CkHttpResponse_getStatusCode(resp);
if (responseCode = 401) then
  begin
    Memo1.Lines.Add(CkHttpResponse__bodyStr(resp));
    Memo1.Lines.Add('If invalid credentials, then it is likely the access token expired.');
    Memo1.Lines.Add('Your app should automatically fetch a new access token and re-try.');
    Exit;
  end;

Memo1.Lines.Add('Response code: ' + IntToStr(responseCode));
Memo1.Lines.Add('Response body');
Memo1.Lines.Add(CkHttpResponse__bodyStr(resp));

//  A successful response looks like this:
//  Response code: 200
//  Response body
//  {
//   "kind": "storage#object",
//   "id": "chilkat-ocean/test.xml/1502669565429870",
//   "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/test.xml",
//   "name": "test.xml",
//   "bucket": "chilkat-ocean",
//   "generation": "1502669565429870",
//   "metageneration": "1",
//   "contentType": "application/xml",
//   "timeCreated": "2017-08-14T00:12:45.379Z",
//   "updated": "2017-08-14T00:12:45.379Z",
//   "storageClass": "MULTI_REGIONAL",
//   "timeStorageClassUpdated": "2017-08-14T00:12:45.379Z",
//   "size": "181",
//   "md5Hash": "TCR0L7TWsw2TzOvfNvgEfA==",
//   "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/test.xml?generation=1502669565429870&alt=media",
//   "crc32c": "ZFd5sA==",
//   "etag": "CO6Qpq241dUCEAE="
//  }

CkStringBuilder_Dispose(sbToken);
CkHttp_Dispose(http);
CkXml_Dispose(xml);
CkStringBuilder_Dispose(sbXml);
CkHttpResponse_Dispose(resp);