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Bug 2032 - Segmentation Fault (11) when calling AddXY in Android
Summary: Segmentation Fault (11) when calling AddXY in Android
Status: CONFIRMED
Alias: None
Product: FireMonkey TeeChart
Classification: Unclassified
Component: Series (show other bugs)
Version: unspecified
Hardware: PC Windows
: --- enhancement
Target Milestone: ---
Assignee: Steema Issue Manager
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2018-05-02 08:10 EDT by yeray alonso
Modified: 2019-03-25 10:41 EDT (History)
0 users

See Also:
Chart Series: ---
Delphi / C++ Builder RAD IDE Version:

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Description yeray alonso 2018-05-02 08:10:02 EDT 
AddXY function works fine in Windows, both for Delphi and C++.
It also works fine in Android for Delphi, but gives a "Segmentation Fault (11)" in Android for C++:

	for ( int i = 0; i < 10; i++)
	{
		Series1->AddXY(i, i);
	}

A workaround is to use AddArray instead. Ie:

	// In the .h
	double xarray[10];
	double yarray[10];

	// In the .cpp
	for ( int i = 0; i < 10; i++)
	{
		xarray[i] = (double)i;
		yarray[i] = (double)i;
	}

	Series1->AddArray(xarray,9,yarray,9);
	Series1->Repaint();
Comment 1 yeray alonso 2018-05-03 04:59:20 EDT 
Note there are some other calls also giving a "Segmentation Fault (11)" error in C++Builder for Android. Not sure if they are related to the AddXY error.

Series1->YValues->Items[Series1->Count()-1]
Series1->YValues->Last()
Comment 2 yeray alonso 2018-05-03 05:00:52 EDT 
Regarding the workaround, you could use AddArray function to simulate AddXY function using an array of one single element. Ie:

void __fastcall TForm1::AddXY(TChartSeries *Series, double x, double y)
{
    xarray[0] = x;
    yarray[0] = y;
    Series->AddArray(xarray,0,yarray,0);
}

Then, you can call it as in this button:

void __fastcall TForm1::Button1Click(TObject *Sender)
{
    for ( int i = 0; i < 10; i++)
    {
        AddXY(Series1, Series1->Count(), Series1->Count());
    }
    Series1->Repaint();
}
Comment 3 yeray alonso 2019-03-25 10:41:18 EDT 
Adding the unit FMXTee.Engine.pas to the project makes the IDE to recompile it and the problem disappears.

These are good news for the source code customers, but it impedes us to debug and find the cause of the problem for those who don't have the sources.