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Port Delphi /Pascal Code to C++  (Visual C++)

Posted on 2008-06-21
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Last Modified: 2013-11-23
I'm using this Lib in a Project and want/must utilize this code now from C++,
what is a good way to port this code to C++.


unit xmlUtilV2;

{******************************************************************************

 *  -->>  see http://www.efpage.de/DelphiXML.html

 *            http://msdn2.microsoft.com/en-us/library/ms757878.aspx

 *

 *  MSXML kapselt die Typelibary zur "MSXML.DLL",

 *  Internetexplorer ab Version 5.0 verfügbar

 *

 *            make msxml data handling more conveniant

 *            source from the Internet

 *

 *

 *

 ******************************************************************************}
 

interface
 

uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, OleCtrls, msxml, StdCtrls, ComCtrls;
 

const  CodePage = 'Windows-1252';
 

    function nodetype(const n: IxmlDomNode): cardinal;

    function GetNodeText(const n0: IXMLDomNode;const  tag: string): string;

    function GetNodeInt(const XmlNode: IXmlDomNode;const  tag: string): integer;

    function GetNodeDouble(const XmlNode: IXmlDomNode;const  tag: string): double;

    function GetNodeAttribute(const n0: IXMLDomNode;const  tag: string): string;

    procedure GetNodeTextList(const n0: IXMLDomNode;const  tag: string; const result: TstringList);

    function CreateXmlDoc(const RootNodeName: string = 'ROOT'): IXmlDomDocument;

    procedure ClearNode(const node: IXMLDomNode);

    procedure copyDoc(xml,xml2: IxmlDomDocument);

    Function CreateNode(node: IXMLDomNode; nodeName: string): IXMLDomNode;

    Function CreateSingleNode(const node: IXMLDomNode;const  nodeName: string): IXMLDomNode;

    Function CreateText(const node: IXMLDomNode;const  text: string): IXMLDomNode;

    Function CreateTextNode(const node: IXMLDomNode;const  nodeName, text: string): IXMLDomNode;

    function IsTextNode(const node: IXMLDomNode): boolean;
 

    Function CreateSingleTextNode(const node: IXMLDomNode; const  nodeName, text: string): IXMLDomNode;

    Function CreateNodeAttribute(const node: IXMLDomNode;const  attrib, text: string): IXMLDomNode;

    Function CreateSingleAttribute(const node: IXMLDomNode;const  attrib, text: string): IXMLDomNode;
 

    function SelectOrCreateSubNode(const node: IXMLDomNode;const  subnodeName: string): IXMLDomNode;         overload;

    function SelectOrCreateTextNode(const node: IXMLDomNode;const  TextnodeName, Text: string): IXMLDomNode;     overload;
 
 

type

   EValue = class(Exception);
 

implementation

(*---------------------------------------------------------------------

rval: string in Double wandeln ohne Fehlermeldung

      Bei Fehler Rückgabe 0

---------------------------------------------------------------------*)

function rval(const s: string): Double;

var  E: Integer;

begin

{$R-}

    Val(S, Result, E);

    if E<>0 then result := 0;

{$R+}

end;

(*---------------------------------------------------------------------

ival: string in Integer wandeln;

---------------------------------------------------------------------*)

function ival(const s: string): integer;

begin

   result := round(rval(s));

end;
 
 

(************************************************************************
 

				   XML-Dokument neu erzeugen
 

************************************************************************)
 

{ -------------------------------------------------

  Neues Dokument erzeugen und einen Basisknoten mit Namen RootNodeName anhängen

  Wenn ein leerer Name übergeben wird wird kein Basisknoten erzeugt.

  Wenn kein Parameter angegeben wird, dann wird ein Knoten Root erzeugt.

  -------------------------------------------------}

function CreateXmlDoc(const RootNodeName: string = 'ROOT'): IXmlDomDocument;

var

    root: IXMLDomElement;

    PI: IXMLDomProcessingInstruction;

begin

    result := CoDOMDocument.create;

    result.preserveWhiteSpace := True;

    PI := result.CreateProcessingInstruction('xml',

          Format('version="1.0" encoding="%s"', [codepage]));

    result.AppendChild(PI);

    if RootNodeName<>'' then

    begin

        root := result.CreateElement(RootNodeName);

        result.AppendChild(root);

    end;

end;
 

(************************************************************************
 

				   XML-Nodes erzeugen
 

************************************************************************)
 

{ -------------------------------------------------

  Liefert direkt den Typ eines Knotens

  -------------------------------------------------}

function nodetype(const n: IxmlDomNode): cardinal;

begin

    if n.hasChildNodes then

        result :=   n.firstChild.nodeType

    else

        result :=   Node_Invalid;

end;
 

{ -------------------------------------------------

  Alle Subnodes und Attribute löchen

  -------------------------------------------------}

procedure ClearNode(const node: IXMLDomNode);

var s: string;

    parent,newchild: IXMLDomNode;

begin

    s := node.nodeName;
 

    if node.parentNode=Nil then

        exit;
 

    newchild := node.ownerDocument.createElement(s);

    parent := node.parentNode;

    parent.replaceChild(newchild,node);

    newchild := node;

    newchild := Nil;

end;
 

procedure copyDoc(xml,xml2: IxmlDomDocument);

var  node: IxmlDomNode;

begin

    ClearNode(xml2.documentElement);

    node := xml.documentElement.firstChild;

    while node <> nil do

    begin

        xml2.documentElement.appendChild(node.cloneNode(true));

        node := node.nextSibling

    end;

end;

{ -------------------------------------------------

  Knoten erzeugen

  Klammerausdrücke im Namen erzeugen ein Attribut Nr.

  -------------------------------------------------}

Function CreateNode( node: IXMLDomNode; nodeName: string): IXMLDomNode;

var Id: IXMLDomNode;

    attr: string;

begin

   if Node=Nil then

   begin

       result := Nil;

       exit;

   end;

   Id := node.ownerDocument.createElement(NodeName);

   node := node.appendChild(Id);

   result := Node;

end;
 
 

{ -------------------------------------------------

  Knoten erzeugen, wenn er noch nicht existiert

  -------------------------------------------------}

Function CreateSingleNode(const node: IXMLDomNode;const nodeName: string): IXMLDomNode;

var Id: IXMLDomNode;

begin

   if Node=Nil then

   begin

       result := Nil;

       exit;

   end;

   result := node.SelectSingleNode(NodeName);

   if Result = Nil then

   begin

       Id := node.ownerDocument.createElement(NodeName);

       result := node.appendChild(Id);

   end;

end;
 

{ -------------------------------------------------

  Textinhalt eines Knoten erzeugen

  -------------------------------------------------}

Function CreateText(const node: IXMLDomNode;const  text: string): IXMLDomNode;

begin

   if Node=Nil then

   begin

       result := Nil;

       exit;

   end;

   node.appendChild(node.ownerDocument.createTextNode(text));

   result := Node;

end;
 

{ -------------------------------------------------

  Prüfen, ob es sich um einen reinen Textknoten handelt

  -------------------------------------------------}

function IsTextNode(const node: IXMLDomNode): boolean;

var child: IXMLDomNode;

begin
 

    child := node.selectSingleNode('*');

    result := child = Nil;

end;
 

{ -------------------------------------------------

  Knoten mit Textinhalt erzeugen

  -------------------------------------------------}

Function CreateTextNode(const node: IXMLDomNode; const nodeName, text: string): IXMLDomNode;

begin

    result := CreateNode(node,nodename);

    CreateText(result,text);

end;
 

{ -------------------------------------------------

  Knoten mit Textinhalt nur erzeugen, wenn er noch nicht existiert

  sonst den aktuellen Wert überschreiben

  -------------------------------------------------}

Function CreateSingleTextNode(const node: IXMLDomNode; const nodeName, text: string): IXMLDomNode;

begin

    result := node.selectSingleNode(nodeName);

    if result = Nil then

    begin

        result := CreateNode(node,nodename);

        CreateText(result,text);

    end

    else

        result.text := text;

end;
 

{ -------------------------------------------------

  Knoten mit Textinhalt erzeugen

  -------------------------------------------------}

{Function CreateTextNode(doc: IXMLDomDocument; node: IXMLDomNode; nodeName, text: string): IXMLDomNode;

var Id,tx: IXMLDomNode;

begin

   if Node=Nil then

   begin

       result := Nil;

       exit;

   end;

   Id := doc.createElement(NodeName);

   tx := doc.createTextNode(text);

   node := node.appendChild(Id);

   node.appendChild(tx);

   result := Node;

end;

}

Function CreateNodeAttribute(const node: IXMLDomNode; const attrib, text: string): IXMLDomNode;

var    attr: IXmlDomAttribute;

begin

   attr := node.ownerDocument.createAttribute(attrib);

   node.attributes.setNamedItem(attr);

   attr.value := text;

end;
 

Function CreateSingleAttribute(const node: IXMLDomNode; const attrib, text: string): IXMLDomNode;

var    attr: IXmlDomNode;

begin

   attr := node.attributes.getNamedItem(attrib);

   if attr <> Nil then

       attr.text := text

   else

       CreateNodeAttribute(node, attrib, text);

       

end;
 

{ -------------------------------------------------

   Text aus node lesen

  -------------------------------------------------}

function GetNodeText(const n0: IXMLDomNode; const tag: string): string;

var n1: IXMLDomnode;

    i: integer;

begin

    if n0=Nil then begin

        result := '';

        exit;

    end;

    n1 := n0.SelectSingleNode(tag);

    if n1=Nil then

        result := ''

    else

    begin

        result := n1.text;

        repeat

        i := pos('?',result);

        if i>0 then

            result[i] := '-';

        until i<=0;

    end;

end;
 

{ -------------------------------------------------

  Werte aus nodes holen

  Bei fehlendem Eintrag oder leerem Node Rückgabe 0

  -------------------------------------------------}

function GetNodeInt(const XmlNode: IXmlDomNode; const tag: string): integer;

begin

    result := round(GetNodeDouble(XmlNode,tag));

end;
 

function GetNodeDouble(const XmlNode: IXmlDomNode; const tag: string): double;

begin

    if XmlNode<>Nil then

        result := rval(GetNodeText(XmlNode,tag))

    else

        result := 0;

end;

{ -------------------------------------------------

   Attribut lesen

  -------------------------------------------------}

function GetNodeAttribute(const n0: IXMLDomNode; const tag: string): string;

var at: IxmlDomNode;

begin

    result := '';

    if n0=Nil then exit;

    if n0.attributes.length=0 then exit;

    at := n0.attributes.getNamedItem(tag);

    if at=Nil then exit;

    result := at.text;

end;

{ -------------------------------------------------

  Liste von Werten aus einem Knoten lesen

  -------------------------------------------------}

procedure GetNodeTextList(const n0: IXMLDomNode; const tag: string; const result: TstringList);

var n1: IXMLDomnodeList;

    i: integer;

begin

    result.Clear;

    if n0=Nil then begin

        exit;

    end;

    n1 := n0.SelectNodes(tag);

    if n1<>Nil then

    begin

        for i := 0 to n1.length-1 do

            result.Add(n1.item[i].nodeTypedValue);

    end;

end;

{ -------------------------------------------------

  Data-Node suchen nach Id oder ggfs erzeugen

  -------------------------------------------------}

function SelectOrCreateSubNode(const node: IXMLDomNode; const subnodeName: string): IXMLDomNode;

var a: string;

begin

    result := node.selectSingleNode(subnodeName);
 

    if result=Nil then

    begin

        result := node.appendChild(node.ownerDocument.createElement(subnodeName));

        if a <> '' then

            CreateNodeAttribute(result,'Nr',a);

    end;

end;
 

{ -------------------------------------------------

  'Text-Node suchen nach Id oder ggfs erzeugen

  -------------------------------------------------}

function SelectOrCreateTextNode(const node: IXMLDomNode; const TextnodeName, Text: string): IXMLDomNode;     overload;

begin

    result := SelectOrCreateSubnode(node,TextNodeName);

    result.text := Text;

end;
 
 

end.

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Question by:BdLm
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4 Comments
 
LVL 3

Expert Comment

by:Mamouri
ID: 21837427
Why do you want to port this code to C++. Instead use Microsoft XML. It's more standard and supported by Microsoft, easier to use and there are lot's of samples for that on the web.
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LVL 8

Author Comment

by:BdLm
ID: 21844374
I use MSXML and the XML Manager CLass from <http://www.codeguru.com/cpp/data/data-misc/xml/article.php/c8287/> )
Beside the performance issue (<http://www.experts-exchange.com/Programming/Languages/CPP/Q_23244509.html?cid=239> )
and many other trouble with this lib (http://www.experts-exchange.com/Programming/Languages/CPP/Q_23244509.html)  or
( http://www.experts-exchange.com/Programming/Languages/CPP/Q_23258772.html) . now
I  gave up to improve this code. MSXML works perfect with this Pascal Unit and Delphi, therefore my next approach for a conventiant
solution would be to transfer this code to C++.
0
 
LVL 3

Accepted Solution

by:
Mamouri earned 500 total points
ID: 21844483
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