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  • NativeXml (11):浮点数的有效位数


    uses NativeXml; 
     
    procedure TForm1.Button1Click(Sender: TObject); 
    var 
      xml: TNativeXml; 
      fVal: Double; 
    begin 
      fVal := 123.456789; 
     
      xml := TNativeXml.CreateName('List'); 
      xml.XmlFormat := xfReadable; 
     
      //xml.FloatSignificantDigits := ; 
      with xml.Root.NodeNew('item') do begin 
        WriteString('Name', 'AAA'); 
        WriteFloat('Weight', fVal); 
      end; 
     
      xml.FloatSignificantDigits := 5; 
      with xml.Root.NodeNew('item') do begin 
        WriteString('Name', 'BBB'); 
        WriteFloat('Weight', fVal); 
      end; 
     
      xml.FloatSignificantDigits := 1; 
      with xml.Root.NodeNew('item') do begin 
        WriteString('Name', 'CCC'); 
        WriteFloat('Weight', fVal); 
      end; 
     
      xml.FloatSignificantDigits := 9; 
      with xml.Root.NodeNew('item') do begin 
        WriteString('Name', 'DDD'); 
        WriteFloat('Weight', fVal); 
      end; 
     
      ShowMessage(xml.Root[0][1].Value); //123.457 
      ShowMessage(xml.Root[1][1].Value); //123.46 
      ShowMessage(xml.Root[2][1].Value); //100 
      ShowMessage(xml.Root[3][1].Value); //123.456789 
      Memo1.Text := xml.WriteToString; 
      xml.Free; 
    end; 
    {*************************************** 
    <?xml version="1.0" encoding="UTF-8"?> 
    <List> 
    	<item> 
    		<Name>AAA</Name> 
    		<Weight>123.457</Weight> 
    	</item> 
    	<item> 
    		<Name>BBB</Name> 
    		<Weight>123.46</Weight> 
    	</item> 
    	<item> 
    		<Name>CCC</Name> 
    		<Weight>100</Weight> 
    	</item> 
    	<item> 
    		<Name>DDD</Name> 
    		<Weight>123.456789</Weight> 
    	</item> 
    </List> 
    *****************************************}
    

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  • 原文地址:https://www.cnblogs.com/del/p/1995883.html
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