CODE:

#ifdef Q_WS_WIN

#define _CRTDBG_MAP_ALLOC
#include <stdlib.h>
#include <crtdbg.h>
#endif //Q_WS_WIN

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);

#ifdef Q_WS_WIN
	_CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );
#endif
		
	QWidget widget;

	int i=0;
	while(i++ < 10)
	{
		widget.setWindowIcon(QIcon(":/config/image/play.png"));
	}

	widget.show();
	int nResult = a.exec();
}


Visual Studio Output:

Detected memory leaks!
Dumping objects ->
{15130} normal block at 0x00B4A1D0, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{15129} normal block at 0x00B2FFE8, 4 bytes long.
 Data: <    > D0 A1 B4 00 
{15128} normal block at 0x00B498B0, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{15127} normal block at 0x00B44CD0, 4 bytes long.
 Data: <    > B0 98 B4 00 
{15126} normal block at 0x00B54F50, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{15125} normal block at 0x00B4A060, 4 bytes long.
 Data: <PO  > 50 4F B5 00 
{15124} normal block at 0x00B27BB8, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{15123} normal block at 0x00B473D8, 4 bytes long.
 Data: < {  > B8 7B B2 00 
{15122} normal block at 0x00B2F3F8, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{15121} normal block at 0x00B2F980, 4 bytes long.
 Data: <    > F8 F3 B2 00 
{15120} normal block at 0x00B4B268, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{15119} normal block at 0x00B4A100, 4 bytes long.
 Data: <h   > 68 B2 B4 00 
{15115} normal block at 0x00B2F458, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{15114} normal block at 0x00B4A0C0, 4 bytes long.
 Data: <X   > 58 F4 B2 00 
{15113} normal block at 0x00B400C8, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{15112} normal block at 0x00B2FB28, 4 bytes long.
 Data: <    > C8 00 B4 00 
{15104} normal block at 0x00B53EB0, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{15103} normal block at 0x00B54AB0, 4 bytes long.
 Data: < >  > B0 3E B5 00 
{15102} normal block at 0x00B48678, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{15101} normal block at 0x00B46798, 4 bytes long.
 Data: <x   > 78 86 B4 00 
{15094} normal block at 0x00B52E68, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{15093} normal block at 0x00B54898, 4 bytes long.
 Data: <h.  > 68 2E B5 00 
{15092} normal block at 0x00B47378, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{15091} normal block at 0x00B41130, 4 bytes long.
 Data: <xs  > 78 73 B4 00 
{15090} normal block at 0x00B47428, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{15089} normal block at 0x00B4A018, 4 bytes long.
 Data: <(t  > 28 74 B4 00 
{15087} normal block at 0x00B54FD0, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{15086} normal block at 0x00B48368, 4 bytes long.
 Data: < O  > D0 4F B5 00 
{15085} normal block at 0x00B467E8, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{15084} normal block at 0x00B464C0, 4 bytes long.
 Data: < g  > E8 67 B4 00 
{15083} normal block at 0x00B2F9C8, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{15082} normal block at 0x00B54B00, 4 bytes long.
 Data: <    > C8 F9 B2 00 
{14273} normal block at 0x00B548E0, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{14272} normal block at 0x00B496F8, 4 bytes long.
 Data: < H  > E0 48 B5 00 
{14181} normal block at 0x00B54EF8, 24 bytes long.
 Data: <                > 01 00 00 00 02 00 00 00 00 00 00 00 01 00 00 00 
{14168} normal block at 0x00B54B40, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{14167} normal block at 0x00B48490, 4 bytes long.
 Data: <@K  > 40 4B B5 00 
{13968} normal block at 0x00B53008, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{13967} normal block at 0x00B53420, 4 bytes long.
 Data: < 0  > 08 30 B5 00 
{13941} normal block at 0x00B539F8, 80 bytes long.
 Data: <  )g          :g> CC 0F 29 67 20 B2 B4 00 00 00 00 00 C0 18 3A 67 
{13940} normal block at 0x00B4B220, 12 bytes long.
 Data: < W   9   W  > B8 57 ED 00 F8 39 B5 00 A4 57 ED 00 
{13886} normal block at 0x00B53888, 80 bytes long.
 Data: <  )g =        :g> CC 0F 29 67 E8 3D B5 00 00 00 00 00 C0 18 3A 67 
{13885} normal block at 0x00B53DE8, 12 bytes long.
 Data: <     8      > A4 86 E6 00 88 38 B5 00 90 86 E6 00 
{13830} normal block at 0x00B54150, 80 bytes long.
 Data: <  )g          :g> CC 0F 29 67 10 C1 B4 00 00 00 00 00 C0 18 3A 67 
{13829} normal block at 0x00B4C110, 12 bytes long.
 Data: <    PA      > A4 C6 E3 00 50 41 B5 00 90 C6 E3 00 
{13775} normal block at 0x00B54400, 80 bytes long.
 Data: <  )g          :g> CC 0F 29 67 D8 B7 B4 00 00 00 00 00 C0 18 3A 67 
{13774} normal block at 0x00B4B7D8, 12 bytes long.
 Data: < 7   D   7  > B8 37 DB 00 00 44 B5 00 A4 37 DB 00 
{13720} normal block at 0x00B535B8, 80 bytes long.
 Data: <  )g(         :g> CC 0F 29 67 28 BD B4 00 00 00 00 00 C0 18 3A 67 
{13719} normal block at 0x00B4BD28, 12 bytes long.
 Data: <     5      > A4 B6 D5 00 B8 35 B5 00 90 B6 D5 00 
{13664} normal block at 0x00B4BC98, 80 bytes long.
 Data: <  )gHE        :g> CC 0F 29 67 48 45 B5 00 00 00 00 00 C0 18 3A 67 
{13663} normal block at 0x00B54548, 12 bytes long.
 Data: <P       <   > 50 C7 D2 00 98 BC B4 00 3C C7 D2 00 
{13588} normal block at 0x00B4AF58, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{13587} normal block at 0x00B4BA08, 4 bytes long.
 Data: <X   > 58 AF B4 00 
{5704} normal block at 0x00B4AE60, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{5703} normal block at 0x00B49FD0, 4 bytes long.
 Data: <`   > 60 AE B4 00 
{3937} normal block at 0x00B47BF0, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{3936} normal block at 0x00B4A238, 4 bytes long.
 Data: < {  > F0 7B B4 00 
{2333} normal block at 0x00B46198, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{2332} normal block at 0x00B471C8, 4 bytes long.
 Data: < a  > 98 61 B4 00 
{1749} normal block at 0x00B45E58, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{1748} normal block at 0x00B45E18, 4 bytes long.
 Data: <X^  > 58 5E B4 00 
{1694} normal block at 0x00B45BF0, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{1693} normal block at 0x00B44C88, 4 bytes long.
 Data: < [  > F0 5B B4 00 
{1469} normal block at 0x00B41600, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{1468} normal block at 0x00B41510, 4 bytes long.
 Data: <    > 00 16 B4 00 
{775} normal block at 0x00B2F928, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{774} normal block at 0x00B2F5C8, 4 bytes long.
 Data: <(   > 28 F9 B2 00 
{773} normal block at 0x00B2F6C0, 552 bytes long.
 Data: <                > 83 00 00 00 83 00 00 00 D0 F6 B2 00 CD CD CD CD 
{717} normal block at 0x00B2EF78, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{716} normal block at 0x00B2F0C0, 116 bytes long.
 Data: <x )g0         :g> 78 84 29 67 30 EF B2 00 00 00 00 00 C0 18 3A 67 
{715} normal block at 0x00B2EF30, 8 bytes long.
 Data: <8 )g    > 38 84 29 67 C0 F0 B2 00 
{714} normal block at 0x00B2EED8, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{713} normal block at 0x00B2EE80, 24 bytes long.
 Data: <                > 00 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00 
{712} normal block at 0x00B2EE08, 56 bytes long.
 Data: <    0           > 06 00 00 00 30 EF B2 00 00 CD CD CD 00 00 00 00 
Object dump complete.
The program '[4200] proSense.exe: Native' has exited with code 0 (0x0).


Other people have reported leaks  as well before. Here is one of the links you get when you google “setIcon() leaks memory”

http://www.qtforum.org/article/28527/qsystemtrayicon-seticon-memory-leak.html

The memory dump is from visual studio. I have not tried calling setIcon in a thread 1000000 times to see if the task manager shows any increase in memory consumption.

I just wanted to know if this is a “REAL” memory leak or one created by static variables.

Thanks.

p.s Since I reported this problem I have discovered that setPixmap on a QLabel also shows up as a memory leak.