webservices传数据

数据集数据转换为XML
function ReplaceString(AString: string): string;
begin
  Result := StringReplace(AString, '&', '&', [rfReplaceAll]);
  Result := StringReplace(Result, '>', '>', [rfReplaceAll]);
  Result := StringReplace(Result, '<', '&lt;', [rfReplaceAll]);
end;

function DataSetToXml(ADataSet: TDataSet; Indent: Integer): string;
var
  i: Integer;
  Indent1, Indent2: string;
  temp: string;
begin
  Indent1 := Format('%*s', [Indent * 2, ' ']);
  Indent2 := Indent1 + ' ';
  Result := EmptyStr;
  ADataSet.First;
  while not ADataSet.Eof do
  begin
    Result := Result + Format('%s<%s>'#13#10, [Indent1, 'Record']);
    for i := 0 to ADataSet.FieldCount - 1 do
      if ADataSet.Fields[i].DataType in [ftString .. ftAutoInc, ftMemo,
        ftWideString] then
      begin
        temp := ReplaceString(ADataSet.Fields[i].AsString);
        Result := Result + Format('%2:s<%0:s>%1:s</%0:s>'#13#10,
          [ADataSet.Fields[i].FieldName, temp, Indent2])
      end;
    Result := Result + Format('%s</%s>'#13#10, [Indent1, 'Record']);
    ADataSet.Next;
  end;
end;

function GenerateXml(ADataSet: TDataSet): string;
begin
  Result := Format
    ('<?xml version="1.0" encoding="gb2312"?>'#13#10'<Records>'#13#10'%s</Records>',
    [DataSetToXml(ADataSet, 1)]);
end;

转换后生成的XML文件内容类似：

<?xml version="1.0" encoding="gb2312"?>

<Records>

  <Record>

   <userid>1</userid>

   <username>李三</username>

  </Record>

  <Record>

   <userid>2</userid>

   <username>王五</username>

  </Record>

</Records>

解析XML内容生成数据集的数据，本例中使用TXMLDocument控件

procedure TForm1.Button1Click(Sender: TObject);
var
  rn,pn,sn:IXMLNode;
  i,j:Integer;
begin
  ClientDataSet1.EmptyDataSet;
  rn:=x.DocumentElement;
  for i := 0 to rn.ChildNodes.Count-1 do begin
    pn := rn.ChildNodes[i];
    ClientDataSet1.Append;
    for j := 0 to pn.ChildNodes.Count-1 do begin
      sn:=pn.ChildNodes[j];
      ClientDataSet1.FindField(sn.NodeName).Text :=sn.NodeValue;
    end;
    ClientDataSet1.Post;
  end;
end;