Hi: These days, i was puzzled by memory leak when i used valgrind to check qt
GUI application. Because there were not many available materials to explain why
there was memory leak in qt(i meaned the qt GUI). So, i send this mail for
getting help.Here was a simple example.source code:#include <QWidget>#include
<QApplication>int main(int argc, char* argv[]){ QApplication app(argc,
argv); QWidget widget; widget.show(); return app.exec();}after i
compiled it. i typed command "valgrind --tool=memcheck --leak-check=full
./test" in terminal.Then, i got the folloing result:==7729== ERROR SUMMARY: 22
errors from 10 contexts (suppressed: 35 from 1)==7729== malloc/free: in use at
exit: 22,222 bytes in 322 blocks.==7729== malloc/free: 3,681 allocs, 3,359
frees, 3,713,807 bytes allocated.==7729== For counts of detected errors, rerun
with: -v==7729== searching for pointers to 322 not-freed blocks.==7729==
checked 401,848 bytes.==7729====7729====7729== 420 (28 direct, 392 indirect)
bytes in 1 blocks are definitely lost in loss record 14 of 24==7729== at
0x401D96E: realloc (vg_replace_malloc.c:429)==7729== by 0x49DC4D3: (within
/usr/lib/libX11.so.6.2.0)==7729== by 0x49DCF3B: (within
/usr/lib/libX11.so.6.2.0)==7729== by 0x49DEC97: _XlcCreateLC (in
/usr/lib/libX11.so.6.2.0)==7729== by 0x4A00929: _XlcUtf8Loader (in
/usr/lib/libX11.so.6.2.0)==7729== by 0x49E57AE: _XOpenLC (in
/usr/lib/libX11.so.6.2.0)==7729== by 0x49E589D: _XrmInitParseInfo (in
/usr/lib/libX11.so.6.2.0)==7729== by 0x49CF4C0: (within
/usr/lib/libX11.so.6.2.0)==7729== by 0x49D0FE7: XrmGetStringDatabase (in
/usr/lib/libX11.so.6.2.0)==7729== by 0x49AA863: XGetDefault (in
/usr/lib/libX11.so.6.2.0)==7729== by 0x545237C: _XcursorGetDisplayInfo (in
/usr/lib/libXcursor.so.1.0. 2)==7729== by 0x54525FC: XcursorSupportsARGB (in
/usr/lib/libXcursor.so.1.0.2)==7729====7729== LEAK SUMMARY:==7729==
definitely lost: 28 bytes in 1 blocks.==7729== indirectly lost: 392 bytes in
14 blocks.==7729== possibly lost: 0 bytes in 0 blocks.==7729== still
reachable: 21,802 bytes in 307 blocks.==7729== suppressed: 0 bytes in 0
blocks.==7729== Reachable blocks (those to which a pointer was found) are not
shown.==7729== To see them, rerun with: --leak-check=full
--show-reachable=yesfrom summary, i got known that the app has lost 28 bytes
memory.I did not know why? and i was hungering for getting your help.Thanks,
best wishes. From: [EMAIL PROTECTED]
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