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Hello, I'm having trouble trying to upload files to my s3 bucket in my Delphi 7 application. I have a python api that generates a presigned url for putting files, and it works perfectly. I am able to send the files to the s3 bucket through Postman, setting the body as binary and the url as the presigned s3 url. Now for the Delphi part, basically what my code does is get the presigned url and send a PUT to it with the TFileStream of a file selected by the user. var SignedURL , res , filePath : string; httpClient : TIdHTTP; SSLIOHandler : TIdSSLIOHandlerSocketOpenSSL; jsonRes : ISuperObject; fileStream : TFileStream begin filePath := 'path/to/file.pdf'; // file selected by user in OpenDialog SignedURL := 'signedUrlGeneratedByPythonCode'; // response from calling my python web api fileStream := TFileStream.Create(filePath, fmOpenRead or fmShareDenyNone); httpClient := TIdHTTP.Create; httpClient.Request.Accept := 'application/json'; SSLIOHandler := TIdSSLIOHandlerSocketOpenSSL.Create(nil); SSLIOHandler.SSLOptions.Method := sslvTLSv1_2; httpClient.IOHandler := SSLIOHandler; try res := httpClient.Put(url, fileStream); jsonRes := SO(res); finally fileStream.Free; httpClient.Free; SSLIOHandler.Free; end; end; With this code I get an access violation at the res := httpClient.Put(url, fileStream); if I run just the Put on runtime, without assigning the response to a variable I get a "Delphi exception EIdSocketError at $2646F905". Removing the SSLIOHandler, I get a "Socket Error #10054 Connection reset by peer.". I'm still a beginner in coding (and very new with Delphi), so I can't pinpoint what exactly could be the problem. I assume it's either because of AWS using HTTPS (although the python api also uses HTTPS and I don't need to set a SSLIOHandler to make a request to it) and my SSL/TLS not working properly or I'm passing the file binaries in the wrong format and the AWS server is refusing the connection instantly. Using: Delphi 7, Indy 10 Thanks in advance, any help would be very much appreciated.

Hi, From our application we use several procedures and functions to upload files to AWS S3 and also download text-like files from AWS S3. We use the function below to get the contents of text-like files (.SVG, .TXT, .CSV) from S3, but we have no idea how to (download and) process binary files. function S3Get_Object_AsString(const bucket, key: string): string; var pyKey : TPythonDelphiVar; pyBucket : TPythonDelphiVar; pyObj : TPythonDelphiVar; PyEngine : IPyEngineAndGIL; pyError : TPythonDelphiVar; Script : TStringList; cModuleName : AnsiString; begin pyKey := TPythonDelphiVar.Create(nil); pyBucket := TPythonDelphiVar.Create(nil); pyObj := TPythonDelphiVar.Create(nil); pyError := TPythonDelphiVar.Create(nil); script := TStringList.Create; try PyEngine := TPyEngineAndGIL.Create; cModuleName := AnsiString(TGUID.NewGuid.ToString); pyBucket.Engine := PyEngine.getPyEngine; pyBucket.VarName := 'BUCKET'; pyBucket.Module := cModuleName; pyBucket.Initialize; pyBucket.Value := bucket; pyKey.Engine := PyEngine.getPyEngine; pyKey.VarName := 'S3KEY'; pyKey.Module := cModuleName; pyKey.Initialize; pyKey.Value := key; pyObj.Engine := PyEngine.getPyEngine; pyObj.VarName := 'OBJ'; pyObj.Module := cModuleName; pyObj.Initialize; pyError.Engine := PyEngine.getPyEngine; pyError.VarName := 'ERROR'; pyError.Module := cModuleName; pyError.Initialize; pyError.Value := ''; InitBotoClient(Script); Script.Add('import json '); Script.Add('from botocore.exceptions import ClientError '); Script.Add('s3_client = client(''s3'')'); Script.Add('try: ' ); Script.Add(' s3_object = s3_client.get_object(Bucket=BUCKET.VALUE, Key=S3KEY.VALUE)'); Script.Add(' OBJ.VALUE = s3_object[''Body''].read()'); Script.Add('except ClientError as e: '); Script.Add(' print("Get Object failed:" + e.response[''Error''][''Message''])'); Script.Add('else:'); Script.Add(' print("Get Object:" + BUCKET.VALUE + "-" + S3KEY.VALUE)'); PyEngine.getPyEngine.ExecModule := cModuleName; PyEngine.getPyEngine.ExecStrings(Script); if pyError.ValueAsString <> '' then begin //Log(pyError.ValueAsString + 'bucket: ' + bucket + ' key:' + key , 'E'); result := ''; end else begin if VarIsStr(pyObj.Value) then result := pyObj.Value else result := ''; end; finally Script.Free; pyBucket.Finalize; pyKey.Finalize; pyObj.Finalize; pyError.Finalize; pyBucket.Free; pyKey.Free; pyObj.Free; pyError.Free; end; end; So far we found an alternative for downloading a file object from S3, but how to process this in Delphi? Script.Add('import json '); Script.Add('import io '); Script.Add('from botocore.exceptions import ClientError '); Script.Add('s3_client = client(''s3'')'); Script.Add('io_stream = io.BytesIO()'); Script.Add('try: ' ); // Script.Add(' s3_object = s3_client.get_object(Bucket=BUCKET.VALUE, Key=S3KEY.VALUE, )'); // Script.Add(' OBJ.VALUE = s3_object[''Body''].read()'); // Use download_fileobj to gat a file-like object Script.Add(' s3_client.download_fileobj(Bucket=BUCKET.VALUE, Key=S3KEY.VALUE, Fileobj=io_stream)'); Script.Add(' io_stream.seek(0)'); Script.Add(' OBJ.VALUE = io_stream.getvalue()'); Script.Add('except ClientError as e: '); Script.Add(' print("Get Object failed:" + e.response[''Error''][''Message''])'); Script.Add('else:'); Script.Add(' print("Get Object:" + BUCKET.VALUE + "-" + S3KEY.VALUE)');