Delphi DLL

Google Cloud Storage: Update Object Metadata

See more Google Cloud Storage Examples

Demonstrates how to update (edit) the metadata associated with an object in a Google Cloud Storage bucket. Delphi DLL

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Http, BinData, HttpResponse, StringBuilder, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
http: HCkHttp;
bdRequestBody: HCkBinData;
resp: HCkHttpResponse;
sbResponseBody: HCkStringBuilder;
jResp: HCkJsonObject;
respStatusCode: Integer;

begin
success := False;

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

http := CkHttp_Create();

// Implements the following CURL command:

// curl -X PATCH --data-binary @JSON_FILE_NAME \
//   -H "Authorization: Bearer OAUTH2_TOKEN" \
//   -H "Content-Type: application/json" \
//   "https://storage.googleapis.com/storage/v1/b/BUCKET_NAME/o/OBJECT_NAME"

// Use the following online tool to generate HTTP code from a CURL command
// Convert a cURL Command to HTTP Source Code

bdRequestBody := CkBinData_Create();
success := CkBinData_LoadFile(bdRequestBody,'JSON_FILE_PATH');
if (success <> True) then
  begin
    Memo1.Lines.Add('Failed to load JSON_FILE_PATH');
    Exit;
  end;

// Adds the "Authorization: Bearer OAUTH2_TOKEN" header.
CkHttp_putAuthToken(http,'OAUTH2_TOKEN');

resp := CkHttpResponse_Create();
success := CkHttp_HttpBd(http,'PATCH','https://storage.googleapis.com/storage/v1/b/BUCKET_NAME/o/OBJECT_NAME',bdRequestBody,'application/json',resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

sbResponseBody := CkStringBuilder_Create();
CkHttpResponse_GetBodySb(resp,sbResponseBody);

jResp := CkJsonObject_Create();
CkJsonObject_LoadSb(jResp,sbResponseBody);
CkJsonObject_putEmitCompact(jResp,False);

Memo1.Lines.Add('Response Body:');
Memo1.Lines.Add(CkJsonObject__emit(jResp));

respStatusCode := CkHttpResponse_getStatusCode(resp);
Memo1.Lines.Add('Response Status Code = ' + IntToStr(respStatusCode));
if (respStatusCode >= 400) then
  begin
    Memo1.Lines.Add('Response Header:');
    Memo1.Lines.Add(CkHttpResponse__header(resp));
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

CkHttp_Dispose(http);
CkBinData_Dispose(bdRequestBody);
CkHttpResponse_Dispose(resp);
CkStringBuilder_Dispose(sbResponseBody);
CkJsonObject_Dispose(jResp);

end;