Delphi soap响应保存到xml？

Question

如何将soap响应保存到xml？我尝试使用tstringlist，filestream，创建了xml文件，但是，我得到了

无法将(null)类型的varinat转换为(olestr)类型

我尝试过这个简单的code.The响应不是empty.The文件大小为40 is。德尔菲XE3.

procedure TForm1.HTTPRIO1AfterExecute(const MethodName: string;
SOAPResponse: TStream);
var xml : TStringlist;
begin
 xml := TStringlist.create;
  try
    soapresponse.Position:=0;
    xml.LoadFromStream(SOAPResponse);
    xml.SaveToFile('...file.xml');
 finally
  xml.Free;
 end;
end;

这就是问题(空行)吗？还是不？

...

- <leiras>
- <![CDATA[ 
*  Socket AM2 for AMD Athlon™ 64FX / 64X2 / 64 and Sempron processors
* ULi M1697

1. Supports FSB 1000MHz (2.0GT/s), Hyper-Transport Technology and AMD Cool 'n' Quiet   Technology
2. Untied Overclocking : During Overclocking, FSB enjoys better margin due to fixed PCIE/ PCI Buses
3. Supports Dual Channel DDRII800/667/533, 4 x DIMM slots, with maximum capacity up to 8GB
4. Hybrid Booster - ASRock Safe Overclocking Technology
5. Supports Dual Graphics XLI
6. 1 x PCI Express x16 slot
7. 1 x PCI Express x 8 slot, to adopt 2nd PCI Express x 16 VGA card and other PCI Express x4, x2, x1 interface cards
8. 2 x PCI Express x1 slots
9. 4 x Serial ATA II 3.0Gb/s, support RAID (RAID 0, 1, 0+1, JBOD and RAID 5), NCQ, AHCI and "Hot Plug" functions
10. 2 x eSATAII 3.0Gb/s, support NCQ, AHCI and "Hot Plug" functions
11. HDMI_SPDIF header, providing SPDIF audio output to HDMI VGA card, allows the system to connect HDMI Digital TV/projector/LCD devices.
12. 7.1 Channel with High Definition Audio
13. Windows Vista™ Premium Logo Hardware Ready
14. ASRock 8CH_eSATAII I/O: 2 eSATAII ports, HD 7.1 channel audio jacks


]]> 
</leiras>
<kepek /> 

...

我尝试了NullStrictConvert := False；没有转换错误，但是exe使用1GB内存，直到我关闭它。

...
var xml : TStringlist;
begin
xml := TStringlist.create;
NullStrictConvert := False;
 try
  soapresponse.Position:=0;

...

Answer 1

你有没有试着直接把你的流倒入一个文件，看看里面有什么？

procedure TForm1.HTTPRIO1AfterExecute(const MethodName: string; SOAPResponse: TStream);
var 
  FS: TFileStream;
begin
  FS := TFileStream.Create('C:\Downloaded.xml', fmCreate);
  try
    FS.CopyFrom(SoapResponse, 0);
  finally
    FS.Free;
  end;
end;

Answer 2

尝试对一个临时字符串变量使用流的Read方法：

procedure TForm1.HTTPRIO1AfterExecute(const MethodName: string; SOAPResponse: TStream);
var
  s: string[200];
  ds: string;
  n: Longint;
  xml: TStringList;
begin
  SOAPResponse.Position := 0;
  xml := TStringList.Create;
  try
    ds := EmptyStr;
    while SOAPResponse.Position < SOAPResponse.Size do begin
      n := SOAPResponse.Read(s[1], 200);
      SetLength(s, n);
      xml.Text := xml.Text + ds;
    end;

    xml.SaveToFile('...file.xml');
  finally
    xml.Free;
  end;
end;

Answer 3

真奇怪。

也许这个例子有帮助。

我正在做几乎相同的事情，记录对TMemo的响应和请求。

另外，我的‘from’例程从外部的SOAPRequest TStringStream中填充实际的TStringStream：

procedure TFrmTestEWS.HTTPRIOBeforeExecute(const MethodName: string; SOAPRequest: TStream);
var
   TS: TStringStream;
   S : String;
begin
   // 1. Fill request
   SOAPRequest.Position := 0;
   FSoapData.Position := 0;
   SOAPRequest.CopyFrom(FSoapData,FSoapData.Size);
   SOAPRequest.Size := FSoapData.Size;
   // 2. Logging
   S := 'Request:' + #13#10#13#10;
   TS := TStringStream.Create(S);
   try
      TS.Position := Length(S);
      FSoapData.Position := 0;
      TS.CopyFrom(FSoapData,FSoapData.Size);
      TS.Position := 0;
      MmoLog.Lines.LoadFromStream(TS);
   finally
      TS.Free;
   end;
end;

procedure TFrmTestEWS.HTTPRIOAfterExecute(const MethodName: string; SOAPResponse: TStream);
var
   TS: TStringStream;
   S : String;
begin
   S := MmoLog.Text + #13#10#13#10 + 'Response:' + #13#10#13#10;
   TS := TStringStream.Create(S);
   try
      TS.Position := Length(S);
      SOAPResponse.Position := 0;
      TS.CopyFrom(SOAPResponse,SOAPResponse.Size);
      TS.Position := 0;
      MmoLog.Lines.LoadFromStream(TS);
   finally
      SOAPResponse.Position := 0;
      TS.Free;
   end;
end;