Как из С++ получить значение ячейки в файле Excel

// Include standard header files
#include <iostream>
#include <cmath>
// Office XP Objects (2002)
#import \
"C:\Program Files\Common Files\Microsoft Shared\OFFICE11\mso.dll" \
rename("DocumentProperties", "DocumentPropertiesXL") \
rename("RGB", "RBGXL")
//Microsoft VBA objects
#import \
"C:\Program Files\Common Files\Microsoft Shared\VBA\VBA6\vbe6ext.olb"
//Excel Application objects 
#import "C:\Program Files\Microsoft Office\OFFICE11\EXCEL.EXE" \
rename("DialogBox", "DialogBoxXL") rename("RGB", "RBGXL") \
rename("DocumentProperties", "DocumentPropertiesXL") \
rename("ReplaceText", "ReplaceTextXL") \
rename("CopyFile", "CopyFileXL") \
exclude("IFont", "IPicture") no_dual_interfaces
//Use the standard namespace
using namespace std;
//Define our own function, e^{-x} sin(x)
//In general this could be the result of a simulation, etc.
double f(const double &x) {return (sin(x)*exp(-x));}
//Main driver program
int main()
{
//Surround the entire interfacing code with a try block
try
{
//Initialise the COM interface
CoInitialize(NULL);
//Define a pointer to the Excel application
Excel::_ApplicationPtr xl;
//Start one instance of Excel
xl.CreateInstance(L"Excel.Application");
//Make the Excel application visible
xl->Visible = true;
//Add a (new) workbook
xl->Workbooks->Add(Excel::xlWorksheet);
//Get a pointer to the active worksheet
Excel::_WorksheetPtr pSheet = xl->ActiveSheet;
//Set the name of the sheet
pSheet->Name = "Chart Data";
//Get a pointer to the cells on the active worksheet
Excel::RangePtr pRange = pSheet->Cells;
//Define the number of plot points
unsigned Nplot = 100;
//Set the lower and upper limits for x
double x_low = 0.0, x_high = 20.0;
//Calculate the size of the (uniform) x interval
//Note a cast to an double here
double h = (x_high - x_low)/(double)Nplot;
//Create two columns of data in the worksheet
//We put labels at the top of each column to say what it contains
pRange->Item[1][1] = "x"; pRange->Item[1][2] = "f(x)";
//Now we fill in the rest of the actual data by
//using a single for loop
for(unsigned i=0;i<Nplot;i++)
{
//Calculate the value of x (equally-spaced over the range)
double x = x_low + i*h;
//The first column is our equally-spaced x values
pRange->Item[i+2][1] = x;
//The second column is f(x)
pRange->Item[i+2][2] = f(x);
}
//The sheet "Chart Data" now contains all the data
//required to generate the chart
//In order to use the Excel Chart Wizard,
//we must convert the data into Range Objects
//Set a pointer to the first cell containing our data
Excel::RangePtr pBeginRange = pRange->Item[1][1];
//Set a pointer to the last cell containing our data
Excel::RangePtr pEndRange = pRange->Item[Nplot+1][2];
//Make a "composite" range of the pointers to the start
//and end of our data
//Note the casts to pointers to Excel Ranges
Excel::RangePtr pTotalRange =
pSheet->Range[(Excel::Range*)pBeginRange][(Excel::Range*)pEndRange];
// Create the chart as a separate chart item in the workbook
Excel::_ChartPtr pChart=xl->ActiveWorkbook->Charts->Add();
//Use the ChartWizard to draw the chart.
//The arguments to the chart wizard are
//Source: the data range,
//Gallery: the chart type,
//Format: a chart format (number 1-10),
//PlotBy: whether the data is stored in columns or rows,
//CategoryLabels: an index for the number of columns
// containing category (x) labels
// (because our first column of data represents
// the x values, we must set this value to 1)
//SeriesLabels: an index for the number of rows containing
// series (y) labels
// (our first row contains y labels,
// so we set this to 1)
//HasLegend: boolean set to true to include a legend
//Title: the title of the chart
//CategoryTitle: the x-axis title
//ValueTitle: the y-axis title
pChart->ChartWizard((Excel::Range*)pTotalRange,
(long)Excel::xlXYScatter,
6L,(long)Excel::xlColumns, 1L, 1L, true,
"My Graph", "x", "f(x)");
//Give the chart sheet a name
pChart->Name = "My Data Plot";
}
//If there has been an error, say so
catch(_com_error & error)
{
cout << "COM ERROR" << endl;
}
//Finally Uninitialise the COM interface
CoUninitialize();
//Finish the C++ program
return 0;
}