How to read chars from a text file and use them in TChart

**Bachatero** · 08-29-2006

Hi,

Can anyone help me with the following problem:

I have to read values from a DetectorLowEnergyGainMap.txt file on the disk that is filled with values like: -128,-10,-30,0, -200 etc. I can read the file with the following code:

Code:

char LowEnergyGainMap[300]; 


bool TMainForm::LeesDetectorLowEnergyGainMap()
{
fstream inputfile;

          inputfile.open("DetectorLowEnergyGainMap.txt"); // 

          	FileName = ExtractFileName(OpenDialog->FileName);
          	SourceFileDir = ExtractFileDir(OpenDialog->FileName);

          		if(!inputfile) {
                	UpDateStatusLine(StatusLineRight,"Detector data file niet geladen !!!");
                	return FALSE;
          		}

          		while(!inputfile.eof()) {
                	inputfile.getline(LowEnergyGainMap, sizeof(LowEnergyGainMap));
          		}
	
          inputfile.close();

          UpDateStatusLine(StatusLineRight,FileName + "  data file geladen !!!");
       return TRUE;
}

So far, everything works fine. If I display the data e.x. with ShowMessage(LowEnergyGainMap) I can see that my array LowEnergyGainMap is filled now with the correct data.

Now if I try to display the data in a TChart with the code below, all the bars are displayed as positive bars and not with the data that is in the LowEnergyGainMap.

Code:

if(WhichRange == "NR"){
 for (t=0; t<NumberOfTubes; t++) {  // Normal Range
      PMTGainNRDet1->Add(LowEnergyGainMap,t+1,GetDefaultColor(16));
}

I know that in the call: Add(LowEnergyGainMap,t+1,GetDefaultColor(16)) LowEnergyGainMap should be declared const double. I think that my problem resides here.

So, in general, how can I read the datavalues from the text file and display them as bars in the TChart.

Any suggestions are very welcome. Thanks in advance

Johan Ditzel

**swoopy** · 08-29-2006

>char LowEnergyGainMap[300];
You might change your definition of LowEnergyGainMap to this:

Code:

#include <vector>
.
.
vector<double> LowEnergyGainMap;

> while(!inputfile.eof()) {
> inputfile.getline(LowEnergyGainMap, sizeof(LowEnergyGainMap));
> }
And your read loop to this:

Code:

          		double num;
          		while (inputfile >> num) {
          		   LowEnergyGainMap.push_back(num);
          		}

> for (t=0; t<NumberOfTubes; t++) { // Normal Range
> PMTGainNRDet1->Add(LowEnergyGainMap,t+1,GetDefaultColor(16));
Then this would be changed to:

Code:

 for (t=0; t<LowEnergyGainMap.size(); t++) {  // Normal Range
      PMTGainNRDet1->Add(LowEnergyGainMap[t],t+1,GetDefaultColor(16));

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How to read chars from a text file and use them in TChart