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Using the MS Chart control in VC++

, 14 Jun 2003
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Setting data and labels on the MS Chart control using VC++
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Introduction

The following is the description for using the MS Chart control in VC++. The diagram below will give you an idea of the chart we are going to make.

First insert the chart control in your project using Project->Add Reference->Microsoft Chart Control. Next is populating the chart control. When I was working with Visual Basic I had used a data source to pass data to the chart. But in VC++ ,I did not get the datasource method in the initial tries. So I passed the chart data through a COleSafeArray. Thanks to J L Colson for illuminating the details in his article on code project.

Here is the code snippet for that.

//First create a safe array
COleSafeArray saRet;

SAFEARRAYBOUND sab[2];

sab[0].cElements =noOfRows; // give this exactly the number of rows you
                               display in your chart
sab[1].cElements = 5;       // number of columns + 1 (because the first
                            // column is where we put the row labels,
                            // ie in 1.1, 2.1, 3.1, 4,1 etc

sab[0].lLbound = sab[1].lLbound = 1;

// Use the chart as the backdrop of the legend.
m_ChartControl.SetShowLegend(TRUE);

// Create the safe-array...

saRet.Create(VT_BSTR, 2, sab);

long index[2] = { 0, 0 };   //a 2D graph needs a 2D array as index array
BSTR bstr;
index[0] = 1;
  
FILEDETAILS filedetailsstruct; // this is just a datastructure I used,
                               // pls see attached code
CString cstemp;

// m_filedetails is an STL list of filedetailsstruct
// in this loop we populate the safe array
for (i = m_filedetails.begin(); i != m_filedetails.end(); i++)
{
    filedetailsstruct = (FILEDETAILS *) i;
    index[1] = 1;

    // make sure this cannot be converted to a valid number like "54" and
    // is a valid string like "John"
    bstr = filedetailsstruct.login.AllocSysString(); // Row label
    saRet.PutElement(index, bstr);

    index[1] = 2;
    bstr = filedetailsstruct.n9000.AllocSysString(); // Data for column 1
    ::SysFreeString(bstr);
    saRet.PutElement(index, bstr);
  
    index[1] = 3;
      bstr = filedetailsstruct.n9002.AllocSysString(); // Data for column 2
    ::SysFreeString(bstr);
    saRet.PutElement(index, bstr);
  
    index[1] = 4;
    bstr = filedetailsstruct.n9004.AllocSysString(); // Data for column 3
    ::SysFreeString(bstr);
    saRet.PutElement(index, bstr);

    index[1] = 5;
    bstr = filedetailsstruct.nCancel.AllocSysString();// Data for column 4
    ::SysFreeString(bstr);
    saRet.PutElement(index, bstr);

    index[0]++;
}

//now hand over the safe array to the chart control
m_ChartControl.SetChartData(saRet.Detach());

Our chart data will look like this:

2,1  2,2  2,3  2,4  2,5
1,1  1,2  1,3  1,4  1,5

where 1,1 - Row label 1 2,1 - Row Label 2

Okay now to label the columns:

m_ChartControl.SetColumnLabelCount(4);
m_ChartControl.SetColumn(1);
m_ChartControl.SetColumnLabel("Monday");
m_ChartControl.SetColumn(2);
m_ChartControl.SetColumnLabel("Wednesday");
m_ChartControl.SetColumn(3);
m_ChartControl.SetColumnLabel("Friday");
m_ChartControl.SetColumn(4);
m_ChartControl.SetColumnLabel("Saturday");

Thats it folks.

Dependencies

MFC42.DLL, MSVCRT.DLL, KERNEL32.DLL, USER32.DLL, ADVAPI32.DLL, OLEAUT32.DLL

Developed On Windows 2000 Server using VC++ ver 6

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

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About the Author

Alex C. Punnen
Architect
India India
Hi everyone!! Sometimes I get real stumped with some concepts and that gets me excited.So I say - hey let me explore - and there I go!! .Currently I am working as software engineer for Nokia Siemens Networks, Bangalore -India.My dream subject - Physics!!

Comments and Discussions

 
QuestionHow to add only one vertical grid line in the plot? [modified] PinmemberYoun-seong Cho28-Nov-06 20:40 

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