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Problem Loading Graphics Column |
Fri, Jun 24 2016 2:33 PM | Permanent Link |
Sidney | I created a RealThinClient server and installed the datasetclient demo. I am running from the demo from firefox. The rows request works correctly for both the EWB external server and the RTC server:
EWB Server: GET http://localhost:81/customdatasets?method=rows&dataset=Biolife HTTP/1.1 RTC Server: GET http://localhost:91/customdatasets?method=rows&dataset=Biolife HTTP/1.1 The load requests are identical except the port for EWB is 81 and the port for RTC is 91: GET http://localhost:81/customdatasets?dataset=Biolife&method=load&column=Graphic&row=90020 HTTP/1.1 Host: localhost:81 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:47.0) Gecko/20100101 Firefox/47.0 Accept: */* Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Referer: http://localhost:81/datasetclient2.html Connection: keep-alive The responses are different: EWB server response - always provides correct image: HTTP/1.1 200 Date: Fri, 24 Jun 2016 17:59:42 GMT From: Server: Elevate Web Builder 2 Web Server Connection: Keep-Alive Cache-Control: no-cache Content-Length: 35644 ... Multiple lines of binary data ... - Fiddler recognizes and displayed the image. RTC server response - always the same length and content regardless of the row key: HTTP/1.1 200 OK CONTENT-LENGTH: 38886 ... Single line of binary data ... - Fiddler says "Not an image". The values sent to GetColumn are ('Graphic','90020'). These values are correct. The TEWBDataAdpater has the following settings: DataSet=Biolife KeyFields=Species No Name=BiolifeAdapter NumKeyFields=1 Question 1: What do I need to do to properly return the graphic? Question 2: How do I add additional headers to my response? My code is below: procedure TfmMain.CustomDatasetsProvDataReceived(Sender: TRtcConnection); var RequestMethod,RequestDataset,ColumnId,RowId,ResponseValue: String; begin with TRtcDataServer(Sender) do if Request.Complete then begin RequestMethod := Request.Query.Value['method']; RequestDataset := Request.Query.Value['dataset']; ColumnId := Request.Query.Value['column']; if SameText(RequestDataset,'Biolife') and SameText(RequestMethod,'rows') then begin ResponseValue := dmBiolife.GetRows; // <<<<< RETURNS CORRECT DATA Write(ResponseValue); end else if SameText(RequestDataset,'Biolife') and SameText(RequestMethod,'load') and SameText(ColumnId,'graphic') then begin RowId := Request.Query.Value['row']; MessageLabel.Text := 'Debug='+RequestMethod+' DS='+RequestDataset+' Col='+ColumnId+' Row='+RowId; ResponseValue := dmBiolife.GetColumn(ColumnId,RowId); // <<<<< RETURNS INCORRECT DATA Write(ResponseValue); end; end; end; function TdmBiolife.GetRows: String; begin BiolifeConnection.Connected := True; Biolife.Active := True; Result := BiolifeAdapter.BuildRows('customdatasets'); Biolife.Active := False; BiolifeConnection.Connected := False; end; function TdmBiolife.GetColumn(ColumnId,RowId: String): String; begin BiolifeConnection.Connected := True; Biolife.Active := True; Result := BiolifeAdapter.BuildLoad(ColumnId,RowId); // <<<< PROBLEM IS LIKELY HERE Biolife.Active := False; BiolifeConnection.Connected := False; end; |
Tue, Jun 28 2016 9:21 AM | Permanent Link |
Tim Young [Elevate Software] Elevate Software, Inc. timyoung@elevatesoft.com | Sidney,
<< function TdmBiolife.GetColumn(ColumnId,RowId: String): String; begin BiolifeConnection.Connected := True; Biolife.Active := True; Result := BiolifeAdapter.BuildLoad(ColumnId,RowId); // <<<< PROBLEM IS LIKELY HERE >> BuildLoad returns an AnsiString, not a String (if using Delphi 2009 or higher). That is most likely the issue, especially if you're not specifically converting the string to UTF-8 or something similar before sending it as a response. Tim Young Elevate Software www.elevatesoft.com |
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