"XML for C++ Developers"

XML 1-3, p.18

 

Listing 1

 

<?xml version ="1.0"?>

<schema name = "posample.xsd"

xmlns = "http://www.w3.org/1999/05/06-xmlschema-

1/structures.xsd">

<elementType name = "PurchaseOrder" model = "open">

<sequence>

<elementTypeRef name = "Buyer"/>

<elementTypeRef name = "Seller"/>

<elementTypeRef name = "Items"

minOccur = "1"

maxOccur = "*"/>

</sequence>

<attrDecl name = "PONumber" required = "true">

<datatypeRef name = "number"/>

</attrDecl>

<attrDecl name = "Date" required = "true">

<datatypeRef name = "date"/>

</attrDecl>

</elementType>

<attrDecl name = "PONumber" required = "true">

<datatypeRef name = "number"/>

</attrDecl>

<attrDecl name = "Date" required = "true">

<datatypeRef name = "date"/>

</attrDecl>

<elementType name = "CompanyName" model = "open">

<datatypeRef name = "string"/>

</elementType>

<elementType name = "BuyingAgent" model = "open">

<datatypeRef name = "string"/>

</elementType>

<elementType name = "Address" model = "open">

<datatypeRef name = "string"/>

</elementType>

<elementType name = "City" model = "open">

<datatypeRef name = "string"/>

</elementType>

<elementType name = "State" model = "open">

<datatypeRef name = "string"/>

</elementType>

<elementType name = "Zip" model = "open">

<datatypeRef name = "string"/>

</elementType>

<elementType name = "Buyer" model = "open">

<sequence>

<elementTypeRef name = "BuyingAgent"/>

<elementTypeRef name = "CompanyName"/>

<elementTypeRef name = "Address"/>

<elementTypeRef name = "City"/>

<elementTypeRef name = "State"/>

<elementTypeRef name = "Zip"/>

</sequence>

</elementType>

<elementType name = "Seller" model = "open">

<sequence>

<elementTypeRef name = "CompanyName"/>

<elementTypeRef name = "Address"/>

<elementTypeRef name = "City"/>

<elementTypeRef name = "State"/>

<elementTypeRef name = "Zip"/>

</sequence>

</elementType>

<elementType name = "Items" model = "open">

<datatypeRef name = "string"/>

<attrDecl name = "PartNumber" required = "true">

<datatypeRef name = "string"/>

</attrDecl>

<attrDecl name = "Quantity" required = "true">

<datatypeRef name = "integer"/>

</attrDecl>

<attrDecl name = "Price" required = "true">

<datatypeRef name = "real"/>

</attrDecl>

</elementType>

<attrDecl name = "PartNumber" required = "true">

<datatypeRef name = "string"/>

</attrDecl>

<attrDecl name = "Quantity" required = "true">

<datatypeRef name = "integer"/>

</attrDecl>

<attrDecl name = "Price" required = "true">

<datatypeRef name = "real"/>

</attrDecl>

</schema>

 

Listing 2

 

// ---------------------------------------------------------------------------

// Includes

// ---------------------------------------------------------------------------

#include <util/PlatformUtils.hpp>

#include <parsers/DOMParser.hpp>

#include <dom/DOM_Node.hpp>

#include <dom/DOM_NamedNodeMap.hpp>

#include "DOMTreeErrorReporter.hpp"

#include <string.h>

#include <stdlib.h>

// ---------------------------------------------------------------------------

//

// main

//

// ---------------------------------------------------------------------------

struct {

char *PartNumber;

char *Quantity;

char *Price; // Yuck, DOM can't handle numbers!

} items[] = {

"123456-7890", "4", "10.20",

"234567-8901", "5", "23.21",

"098765-4321", "2", "98.42",

NULL, NULL, NULL

};

int main(int argC, char* argV[])

{

// Initialize the XML4C2 system

try

{

XMLPlatformUtils::Initialize();

}

catch(const XMLException& toCatch)

{

cerr << "Error during Xerces-c Initialization.\n"

<< " Exception message:"

<< DOMString(toCatch.getMessage()) << endl;

return 1;

}

// create a DOM Document node

DOM_Document PODoc = DOM_Document::createDocument();

DOM_Text tab = PODoc.createTextNode(DOMString("\t"));

// create the root node for a PO

DOM_Node PO = PODoc.createElement("PurchaseOrder");

PODoc.appendChild(PO);

// set the PONumber

DOM_Attr PONumber = PODoc.createAttribute("PONumber");

PONumber.setValue(DOMString("12345")); // strings only, yuck!

DOM_NamedNodeMap attrs = PO.getAttributes();

attrs.setNamedItem(PONumber);

// set the PONumber

DOM_Attr PODate = PODoc.createAttribute("Date");

PODate.setValue(DOMString("March 30, 2000")); // strings

only, yuck!

attrs.setNamedItem(PODate);

//

// create the Buyer Info

//

DOM_Node Buyer = PODoc.createElement("Buyer");

PO.appendChild(Buyer);

// set the Buyer subelements

// first, the agent's name

DOM_Node BuyingAgent =

PODoc.createElement(DOMString("BuyingAgent"));

DOM_Text BuyingAgentName = PODoc.createTextNode(DOM-

String("J.Q. Buyer"));

Buyer.appendChild(BuyingAgent);

BuyingAgent.appendChild(BuyingAgentName);

// next, the buyer's company

DOM_Node BuyerCompany =

PODoc.createElement(DOMString("CompanyName"));

DOM_Text BuyerCompanyName = PODoc.createTextNode(DOM-

String("Acme Buying, Inc."));

BuyerCompany.appendChild(BuyerCompanyName);

Buyer.appendChild(BuyerCompany);

// next, the buyer's address

DOM_Node BuyerAddress =

PODoc.createElement(DOMString("Address"));

DOM_Text BuyerAddressName = PODoc.createTextNode(DOM-

String("123 21st Street"));

BuyerAddress.appendChild(BuyerAddressName);

Buyer.appendChild(BuyerAddress);

// next, the buyer's city

DOM_Node BuyerCity =

PODoc.createElement(DOMString("City"));

DOM_Text BuyerCityName = PODoc.createTextNode(DOM-

String("New York"));

BuyerCity.appendChild(BuyerCityName);

Buyer.appendChild(BuyerCity);

// next, the buyer's state

DOM_Node BuyerState =

PODoc.createElement(DOMString("State"));

DOM_Text BuyerStateName = PODoc.createTextNode(DOM-

String("NY"));

BuyerState.appendChild(BuyerStateName);

Buyer.appendChild(BuyerState);

// finally, the buyer's zip

DOM_Node BuyerZip =

PODoc.createElement(DOMString("Zip"));

DOM_Text BuyerZipName = PODoc.createTextNode(DOM-

String("01234"));

BuyerZip.appendChild(BuyerZipName);

Buyer.appendChild(BuyerZip);

//

// create the Seller Info

//

DOM_Node Seller = PODoc.createElement("Seller");

PO.appendChild(Seller);

// set the Seller subelements

// first, the Seller's company

DOM_Node SellerCompany =

PODoc.createElement(DOMString("CompanyName"));

DOM_Text SellerCompanyName = PODoc.createTextNode(DOM-

String("Zeta Selling, Inc."));

SellerCompany.appendChild(SellerCompanyName);

Seller.appendChild(SellerCompany);

String("Zeta Selling, Inc."));

SellerCompany.appendChild(SellerCompanyName);

Seller.appendChild(SellerCompany);

// next, the seller's address

DOM_Node SellerAddress =

PODoc.createElement(DOMString("Address"));

DOM_Text SellerAddressName = PODoc.createTextNode(DOM-

String("123 12th Street"));

SellerAddress.appendChild(SellerAddressName);

Seller.appendChild(SellerAddress);

// next, the seller's city

DOM_Node SellerCity =

PODoc.createElement(DOMString("City"));

DOM_Text SellerCityName = PODoc.createTextNode(DOM-

String("Las Angelese"));

SellerCity.appendChild(SellerCityName);

Seller.appendChild(SellerCity);

// next, the seller's state

DOM_Node SellerState =

PODoc.createElement(DOMString("State"));

DOM_Text SellerStateName = PODoc.createTextNode(DOM-

String("CA"));

SellerState.appendChild(SellerStateName);

Seller.appendChild(SellerState);

// finally, the seller's zip

DOM_Node SellerZip =

PODoc.createElement(DOMString("Zip"));

DOM_Text SellerZipName = PODoc.createTextNode(DOM-

String("43210"));

SellerZip.appendChild(SellerZipName);

Seller.appendChild(SellerZip);

//

// Create an Item element for each item on the PO

//

for (int i = 0; items[i].PartNumber; i++) {

// create an item node

DOM_Node Item = PODoc.createElement("Item");

PO.appendChild(Item);

DOM_NamedNodeMap attrs = Item.getAttributes();

// set the PartNumber

DOM_Attr PartNumber = PODoc.createAttribute("PartNumber");

PartNumber.setValue(DOMString(items[i].PartNumber));

attrs.setNamedItem(PartNumber);

// set the Quantity

DOM_Attr Quantity = PODoc.createAttribute("Quantity");

Quantity.setValue(DOMString(items[i].Quantity));

attrs.setNamedItem(Quantity);

// set the Price

DOM_Attr Price = PODoc.createAttribute("Price");

Price.setValue(DOMString(items[i].Price));

attrs.setNamedItem(Price);

}

// write out the XML

cout << PODoc << endl;

//

// The DOM document and its contents are reference

// counted, and need no explicit deletion.

//

return

 

Listing 3

 

{

// create the PO object and set attributes

posample::PurchaseOrder PO;

PO.Set_Date("March 28, 2000");

PO.Set_PONumber(12345);

// set Buyer info

posample::Buyer Buyer = PO.Get_Buyer();

Buyer.Set_BuyingAgent("J. Q. Buyer");

Buyer.Set_CompanyName("Buyer, Inc.");

Buyer.Set_Address("123 21st Street");

Buyer.Set_City("New York");

Buyer.Set_State("NY");

Buyer.Set_Zip("12345");

PO.Set_Buyer(Buyer);

// set Seller info

posample::Seller Seller = PO.Get_Seller();

Seller.Set_CompanyName("Seller, Inc.");

Seller.Set_Address("123 21st Street");

Seller.Set_City("New York");

Seller.Set_State("NY");

Seller.Set_Zip("12345");

PO.Set_Seller(Seller);

// XList is a derivative of the MFC CList template

eXactML::XList<posample::Item *> & itemList =

PO.Get_ItemList();

for (int i = 0; items[i].PartNumber; i++) {

posample::Item *pItem = new posample::Item;

pItem->Set_PartNumber(items[i].PartNumber);

pItem->Set_Quantity(items[i].Quantity);

pItem->Set_Price(items[i].Price);

itemList.AddTail(pItem);

}

// verify that we have valid XML

try {

PO.IsValid();

}

catch (eXactML::XException e) {

CString msg;

msg.Format("Exception: (%s) while validating

imported XML", e.GetMsg().c_str());

AfxMessageBox("XML import validation failed!\n" +

msg,MB_OK|MB_ICONSTOP);

return;

}

// export the data to XML format.

try {

PO.EmitXMLToFile("posample.xml");

}

catch (CFileException e) {

TCHAR szCause[255];

e.GetErrorMessage(szCause, 255);

AfxMessageBox("CFileException: " +

CString(szCause));

}

catch (XException e) {

CString msg;

msg.Format("Exception: (%s) while generating

XML",e.GetMsg().c_str());

AfxMessageBox("Export to " +

CString("posample.xml") + " failed!" + "\n" + msg);

return;

}

catch (CException e) {

TCHAR szCause[255];

e.GetErrorMessage(szCause, 255);

AfxMessageBox("CFileException: " +

CString(szCause));

}

catch (...) {

AfxMessageBox("Unrecognized exception while gener-

ating XML.");

return;

}

}