Writing data

This example creates receipt.xls as is showed on the picture below:
#include "libxl.h"
#include <sstream>

using namespace libxl;

int main() 
{
   Book* book = xlCreateBook();

   int logoId = book->addPicture(L"logo.png");

   // fonts

   Font* textFont = book->addFont();
   textFont->setSize(8);
   textFont->setName(L"Century Gothic");

   Font* titleFont = book->addFont(textFont);
   titleFont->setSize(38);
   titleFont->setColor(COLOR_GRAY25);

   Font* font12 = book->addFont(textFont);
   font12->setSize(12);

   Font* font10 = book->addFont(textFont);
   font10->setSize(10);
   
   // formats

   Format* textFormat = book->addFormat();
   textFormat->setFont(textFont);
   textFormat->setAlignH(ALIGNH_LEFT);

   Format* titleFormat = book->addFormat();
   titleFormat->setFont(titleFont);
   titleFormat->setAlignH(ALIGNH_RIGHT);

   Format* companyFormat = book->addFormat();
   companyFormat->setFont(font12);
        
   Format* dateFormat = book->addFormat(textFormat);
   dateFormat->setNumFormat(book->addCustomNumFormat(L"[$-409]mmmm\\ d\\,\\ yyyy;@"));

   Format* phoneFormat = book->addFormat(textFormat);
   phoneFormat->setNumFormat(
      book->addCustomNumFormat(L"[<=9999999]###\\-####;\\(###\\)\\ ###\\-####")
   );

   Format* borderFormat = book->addFormat(textFormat);
   borderFormat->setBorder();
   borderFormat->setBorderColor(COLOR_GRAY25);
   borderFormat->setAlignV(ALIGNV_CENTER);

   Format* percentFormat = book->addFormat(borderFormat);
   percentFormat->setNumFormat(book->addCustomNumFormat(L"#%_)"));
   percentFormat->setAlignH(ALIGNH_RIGHT);

   Format* textRightFormat = book->addFormat(textFormat);
   textRightFormat->setAlignH(ALIGNH_RIGHT);
   textRightFormat->setAlignV(ALIGNV_CENTER);

   Format* thankFormat = book->addFormat();
   thankFormat->setFont(font10);
   thankFormat->setAlignH(ALIGNH_CENTER);

   Format* dollarFormat = book->addFormat(borderFormat);
   dollarFormat->setNumFormat(
      book->addCustomNumFormat(L"_($* # ##0.00_);_($* (# ##0.00);_($* -??_);_(@_)")
   );

   // actions

   Sheet* sheet = book->addSheet(L"Sales Receipt");

   sheet->setDisplayGridlines(false);

   sheet->setCol(1, 1, 36);
   sheet->setCol(0, 0, 10);
   sheet->setCol(2, 4, 11);

   sheet->setRow(2, 47.25);
   sheet->writeStr(2, 1, L"Sales Receipt", titleFormat);
   sheet->setMerge(2, 2, 1, 4);
   sheet->setPicture(2, 1, logoId);

   sheet->writeStr(4, 0, L"Apricot Ltd.", companyFormat);
   sheet->writeStr(4, 3, L"Date:", textFormat);
   sheet->writeFormula(4, 4, L"TODAY()", dateFormat);

   sheet->writeStr(5, 3, L"Receipt #:", textFormat);
   sheet->writeNum(5, 4, 652, textFormat);

   sheet->writeStr(8, 0, L"Sold to:", textFormat);
   sheet->writeStr(8, 1, L"John Smith", textFormat);
   sheet->writeStr(9, 1, L"Pineapple Ltd.", textFormat);
   sheet->writeStr(10, 1, L"123 Dreamland Street", textFormat);
   sheet->writeStr(11, 1, L"Moema, 52674", textFormat);
   sheet->writeNum(12, 1, 2659872055, phoneFormat);

   sheet->writeStr(14, 0, L"Item #", textFormat);
   sheet->writeStr(14, 1, L"Description", textFormat);
   sheet->writeStr(14, 2, L"Qty", textFormat);
   sheet->writeStr(14, 3, L"Unit Price", textFormat);
   sheet->writeStr(14, 4, L"Line Total", textFormat);

   for(unsigned short row = 15; row < 38; ++row)
   {
      sheet->setRow(row, 15);
      for(unsigned short col = 0; col < 3; ++col)
      {
         sheet->writeBlank(row, col, borderFormat);
      }
      sheet->writeBlank(row, 3, dollarFormat);

      std::wstringstream stream;
      stream << "IF(C" << row + 1 << ">0;ABS(C" << row + 1 << "*D" << row + 1 << ");\"\")";
      sheet->writeFormula(row, 4, stream.str().c_str(), dollarFormat);
   }

   sheet->writeStr(38, 3, L"Subtotal ", textRightFormat);
   sheet->writeStr(39, 3, L"Sales Tax ", textRightFormat);
   sheet->writeStr(40, 3, L"Total ", textRightFormat);
   sheet->writeFormula(38, 4, L"SUM(E16:E38)", dollarFormat);
   sheet->writeNum(39, 4, 0.2, percentFormat);
   sheet->writeFormula(40, 4, L"E39+E39*E40", dollarFormat);
   sheet->setRow(38, 15);
   sheet->setRow(39, 15);
   sheet->setRow(40, 15);

   sheet->writeStr(42, 0, L"Thank you for your business!", thankFormat);
   sheet->setMerge(42, 42, 0, 4);

   // items

   sheet->writeNum(15, 0, 45, borderFormat);
   sheet->writeStr(15, 1, L"Grapes", borderFormat);
   sheet->writeNum(15, 2, 250, borderFormat);
   sheet->writeNum(15, 3, 4.5, dollarFormat);

   sheet->writeNum(16, 0, 12, borderFormat);
   sheet->writeStr(16, 1, L"Bananas", borderFormat);
   sheet->writeNum(16, 2, 480, borderFormat);
   sheet->writeNum(16, 3, 1.4, dollarFormat);

   sheet->writeNum(17, 0, 19, borderFormat);
   sheet->writeStr(17, 1, L"Apples", borderFormat);
   sheet->writeNum(17, 2, 180, borderFormat);
   sheet->writeNum(17, 3, 2.8, dollarFormat);

   book->save(L"receipt.xls");
   book->release();

   return 0;
}