c++ builder XE4 > TeeChart > AddXY() とDelete()の繰り返し > メモリ使用量の変化調査

動作環境

C++ Builder XE4

関連 http://qiita.com/7of9/items/973ecac73c16b0740e36

TeeChartのSeriesのAddXY()をして、余分なデータをDelete()する、という処理を繰り返した時にメモリリークが発生しないか調べた。

Unit1.h

//---------------------------------------------------------------------------

# ifndef Unit1H
# define Unit1H
//---------------------------------------------------------------------------
# include <System.Classes.hpp>
# include <Vcl.Controls.hpp>
# include <Vcl.StdCtrls.hpp>
# include <Vcl.Forms.hpp>
# include <Vcl.ExtCtrls.hpp>
# include <VCLTee.Chart.hpp>
# include <VCLTee.Series.hpp>
# include <VCLTee.TeEngine.hpp>
# include <VCLTee.TeeProcs.hpp>
//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published:	// IDE で管理されるコンポーネント
	TChart *Chart1;
	TFastLineSeries *Series1;
	TButton *Button1;
	void __fastcall FormShow(TObject *Sender);
	void __fastcall Button1Click(TObject *Sender);
private:	// ユーザー宣言
	void __fastcall addData();
	void __fastcall removeData();
public:		// ユーザー宣言
	__fastcall TForm1(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------------------------------------------
# endif

Unit1.cpp

//---------------------------------------------------------------------------

# include <vcl.h>
# pragma hdrstop

# include <DateUtils.hpp>
# include "Unit1.h"
//---------------------------------------------------------------------------
# pragma package(smart_init)
# pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
	: TForm(Owner)
{
}
//---------------------------------------------------------------------------

static const int kNumData = 200000;

void __fastcall TForm1::FormShow(TObject *Sender)
{
	Chart1->Series[0]->XValues->DateTime = true;
	Chart1->BottomAxis->DateTimeFormat = L"nn:ss";
}
//---------------------------------------------------------------------------
void __fastcall TForm1::addData()
{
	TDateTime dt;

	dt = Now();

	double yval;

	for (int idx=0; idx < kNumData; idx++) {
		yval = (1+ idx) % 2;
		Series1->AddXY(dt, yval, "", clRed);
		dt = IncSecond(dt, 1);
	}
}

void __fastcall TForm1::removeData()
{
	for (int idx=0; idx < kNumData; idx++) {
		if (Series1->Count() == 0) {
			break;
		}
		Series1->Delete(0);
    }
}

//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
	Screen->Cursor = crHourGlass;

	removeData();
	addData();

	Screen->Cursor = crArrow;
}
//---------------------------------------------------------------------------

TeeChartで使えるデー多数は20万件なので、20万件のデータをremove, addしてみた。

メモリリークしてなかった。8332KBから変化なし。