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  • Why do people keep parsing HTML using regex? [closed]

    - by polygenelubricants
    As much as I love regular expressions, it's obvious to me that it's not the best tool for parsing HTML, especially given the numerous good HTML parsers out there. And yet there are numerous questions on stackoverflow that attempts to parse HTML using regex. And people would always point out what a bad idea that is in the comments. And the accepted answer would often have a disclaimer how this isn't really the ideal way of doing things. But based on the constant flow of questions, it still seems that people keep parsing HTML using regex, despite the perceived difficulty in reading and maintaining it (and that's putting correctness aside for now). So my question is: why? Is it because it's easy to learn? Is it because it's faster? Is it because it's the industry standard? Is it because there are already so many reusable regexes to build from? Is it because 100% correctness is never really the objective? (90% good enough?) etc... I'd also like to hear from the downvoters why they did so. Is it because: There's absolutely nothing wrong with using regex to parse HTML and asking "Why?" is just dumb? The premise of the question is flawed because the people who are using regex to parse HTML is such a small minority?

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  • Qt Linking Error.

    - by Wallah
    Hi, I configure qt-x11 with following options ./configure -prefix /iTalk/qtx11 -prefix-install -bindir /iTalk/qtx11-install/bin -libdir /iTalk/qtx11-install/lib -docdir /iTalk/qtx11-install/doc -headerdir /iTalk/qtx11-install/include -datadir /iTalk/qtx11-install/data -examplesdir /iTalk/qtx11-install/examples -demosdir /iTalk/qtx11-install/demos -debug. Now I am getting following errors in Fedora Core 6. Can you please tell me where the problem is? obj/debug-shared/qapplication_x11.o: In function `qt_init(QApplicationPrivate*, int, _XDisplay*, unsigned long, unsigned long)': /iTalk/QT4/qt/src/gui/kernel/qapplication_x11.cpp:1713: undefined reference to `FcInit' .obj/debug-shared/qfontdatabase.o: In function `queryFont': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1727: undefined reference to `FcFreeTypeQuery' .obj/debug-shared/qfontdatabase.o: In function `registerFont': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1959: undefined reference to `FcConfigGetCurrent' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1963: undefined reference to `FcConfigGetFonts' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1965: undefined reference to `FcConfigAppFontAddFile' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1966: undefined reference to `FcConfigGetFonts' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1985: undefined reference to `FcConfigGetBlanks' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1997: undefined reference to `FcPatternDel' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1998: undefined reference to `FcPatternAddString' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:2001: undefined reference to `FcPatternGetString' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:2006: undefined reference to `FcFontSetAdd' .obj/debug-shared/qfontdatabase.o: In function `qt_FcPatternToQFontDef(_FcPattern*, QFontDef const&)': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:746: undefined reference to `FcPatternGetString' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:751: undefined reference to `FcPatternGetDouble' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:759: undefined reference to `FcPatternGetDouble' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:771: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:776: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:786: undefined reference to `FcPatternGetBool' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:793: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:800: undefined reference to `FcPatternGetInteger' .obj/debug-shared/qfontdatabase.o: In function `FcFontSetRemove': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1573: undefined reference to `FcPatternDestroy' .obj/debug-shared/qfontdatabase.o: In function `qt_fontSetForPattern(_FcPattern*, QFontDef const&)': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1657: undefined reference to `FcFontSort' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1671: undefined reference to `FcPatternGetBool' .obj/debug-shared/qfontdatabase.o: In function `qt_addPatternProps(_FcPattern*, int, int, QFontDef const&)': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1449: undefined reference to `FcPatternAddInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1456: undefined reference to `FcPatternAddInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1459: undefined reference to `FcPatternAddDouble' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1464: undefined reference to `FcPatternAddInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1468: undefined reference to `FcPatternAddBool' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1471: undefined reference to `FcPatternAddBool' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1476: undefined reference to `FcLangSetCreate' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1477: undefined reference to `FcLangSetAdd' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1478: undefined reference to `FcPatternAddLangSet' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1479: undefined reference to `FcLangSetDestroy' .obj/debug-shared/qfontdatabase.o: In function `tryPatternLoad': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1588: undefined reference to `FcPatternDuplicate' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1593: undefined reference to `FcConfigSubstitute' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1594: undefined reference to `FcDefaultSubstitute' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1596: undefined reference to `FcFontMatch' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1606: undefined reference to `FcPatternDuplicate' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1613: undefined reference to `FcPatternGetCharSet' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1615: undefined reference to `FcCharSetHasChar' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1619: undefined reference to `FcPatternGetLangSet' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1621: undefined reference to `FcLangSetHasLang' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1628: undefined reference to `FcPatternDel' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1629: undefined reference to `FcPatternAddBool' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1646: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1648: undefined reference to `FcPatternDestroy' .obj/debug-shared/qfontdatabase.o: In function `loadFontConfig': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1023: undefined reference to `FcObjectSetCreate' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1024: undefined reference to `FcPatternCreate' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1037: undefined reference to `FcObjectSetAdd' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1040: undefined reference to `FcFontList' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1041: undefined reference to `FcObjectSetDestroy' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1042: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1046: undefined reference to `FcPatternGetString' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1057: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1059: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1061: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1063: undefined reference to `FcPatternGetString' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1065: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1067: undefined reference to `FcPatternGetBool' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1069: undefined reference to `FcPatternGetString' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1074: undefined reference to `FcPatternGetLangSet' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1081: undefined reference to `FcLangSetHasLang' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1100: undefined reference to `FcPatternGetCharSet' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1107: undefined reference to `FcCharSetHasChar' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1116: undefined reference to `FcPatternGetString' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1136: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1153: undefined reference to `FcPatternGetDouble' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1161: undefined reference to `FcFontSetDestroy' .obj/debug-shared/qfontdatabase.o: In function `getFcPattern': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1494: undefined reference to `FcPatternCreate' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1509: undefined reference to `FcPatternAdd' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1516: undefined reference to `FcPatternAddWeak' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1524: undefined reference to `FcPatternAddWeak' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1531: undefined reference to `FcPatternAddInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1533: undefined reference to `FcPatternAddBool' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1535: undefined reference to `FcPatternAddBool' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1539: undefined reference to `FcDefaultSubstitute' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1540: undefined reference to `FcConfigSubstitute' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1541: undefined reference to `FcConfigSubstitute' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1550: undefined reference to `FcPatternAddWeak' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1557: undefined reference to `FcPatternAddWeak' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1564: undefined reference to `FcPatternAddWeak' .obj/debug-shared/qfontdatabase.o: In function `loadFc': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1707: undefined reference to `FcFontSetDestroy' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1716: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1718: undefined reference to `FcPatternDestroy' .obj/debug-shared/qfontdatabase.o: In function `QFontDatabase::removeAllApplicationFonts()': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:2048: undefined reference to `FcConfigAppFontClear' .obj/debug-shared/qfontdatabase.o: In function `QFontDatabase::removeApplicationFont(int)': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:2027: undefined reference to `FcConfigAppFontClear' .obj/debug-shared/qfontengine_x11.o: In function `qt_x11ft_convert_pattern(_FcPattern*, QByteArray*, int*, bool*)': /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:970: undefined reference to `FcPatternGetString' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:972: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:975: undefined reference to `FcPatternGetBool' .obj/debug-shared/qfontengine_x11.o: In function `QFontEngineX11FT': /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:999: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1016: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1041: undefined reference to `FcPatternGetBool' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1077: undefined reference to `FcPatternGetBool' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1106: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1112: undefined reference to `FcPatternGetCharSet' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1113: undefined reference to `FcCharSetCopy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1115: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:999: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1016: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1041: undefined reference to `FcPatternGetBool' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1077: undefined reference to `FcPatternGetBool' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1106: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1112: undefined reference to `FcPatternGetCharSet' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1113: undefined reference to `FcCharSetCopy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1115: undefined reference to `FcPatternDestroy' .obj/debug-shared/qfontengine_x11.o: In function `engineForPattern': /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:868: undefined reference to `FcFontMatch' .obj/debug-shared/qfontengine_x11.o: In function `QFontEngineMultiFT::loadEngine(int)': /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:929: undefined reference to `FcPatternEqual' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:932: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:941: undefined reference to `FcPatternDuplicate' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:951: undefined reference to `FcConfigSubstitute' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:952: undefined reference to `FcDefaultSubstitute' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:956: undefined reference to `FcPatternDestroy' .obj/debug-shared/qfontengine_x11.o: In function `~QFontEngineMultiFT': /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:895: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:897: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:899: undefined reference to `FcFontSetDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:895: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:897: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:899: undefined reference to `FcFontSetDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:895: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:897: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:899: undefined reference to `FcFontSetDestroy' .obj/debug-shared/qfontengine_ft.o: In function `QFontEngineFT::stringToCMap(QChar const*, int, QGlyphLayout*, int*, QFlags) const': /iTalk/QT4/qt/src/gui/text/qfontengine_ft.cpp:1546: undefined reference to `FcCharSetHasChar' /iTalk/QT4/qt/src/gui/text/qfontengine_ft.cpp:1581: undefined reference to `FcCharSetHasChar' .obj/debug-shared/qfontengine_ft.o: In function `QFreetypeFace::release(QFontEngine::FaceId const&)': /iTalk/QT4/qt/src/gui/text/qfontengine_ft.cpp:308: undefined reference to `FcCharSetDestroy' collect2: ld returned 1 exit status make[1]: *** [../../lib/libQtGui.so.4.5.3] Error 1 make[1]: Leaving directory `/iTalk/QT4/qt/src/gui' make: *** [sub-gui-make_default-ordered] Error 2

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  • Creating an Objective-C++ Static Library in Xcode

    - by helixed
    So I've developed an engine for the iPhone with which I'd like to build a couple different games. Rather than copy and paste the files for the engine inside of each game's project directory, I'd a way to link to the engine from each game, so if I need to make a change to it I only have to do so once. After reeding around a little bit, it seems like static libraries are the best way to do this on the iPhone. I created a new project called Skeleton and copied all of my engine files over to it. I used this guide to create a static library, and I imported the library into a project called Chooser. However, when I tried to compile the project, Xcode started complaining about some C++ data structures I included in a file called ControlScene.mm. Here's my build errors: "operator delete(void*)", referenced from: -[ControlScene dealloc] in libSkeleton.a(ControlScene.o) -[ControlScene init] in libSkeleton.a(ControlScene.o) __gnu_cxx::new_allocator<operation_t>::deallocate(operation_t*, unsigned long)in libSkeleton.a(ControlScene.o) __gnu_cxx::new_allocator<operation_t*>::deallocate(operation_t**, unsigned long)in libSkeleton.a(ControlScene.o) "operator new(unsigned long)", referenced from: -[ControlScene init] in libSkeleton.a(ControlScene.o) __gnu_cxx::new_allocator<operation_t*>::allocate(unsigned long, void const*)in libSkeleton.a(ControlScene.o) __gnu_cxx::new_allocator<operation_t>::allocate(unsigned long, void const*)in libSkeleton.a(ControlScene.o) "std::__throw_bad_alloc()", referenced from: __gnu_cxx::new_allocator<operation_t*>::allocate(unsigned long, void const*)in libSkeleton.a(ControlScene.o) __gnu_cxx::new_allocator<operation_t>::allocate(unsigned long, void const*)in libSkeleton.a(ControlScene.o) "___cxa_rethrow", referenced from: std::_Deque_base<operation_t, std::allocator<operation_t> >::_M_create_nodes(operation_t**, operation_t**)in libSkeleton.a(ControlScene.o) std::_Deque_base<operation_t, std::allocator<operation_t> >::_M_initialize_map(unsigned long)in libSkeleton.a(ControlScene.o) "___cxa_end_catch", referenced from: std::_Deque_base<operation_t, std::allocator<operation_t> >::_M_create_nodes(operation_t**, operation_t**)in libSkeleton.a(ControlScene.o) std::_Deque_base<operation_t, std::allocator<operation_t> >::_M_initialize_map(unsigned long)in libSkeleton.a(ControlScene.o) "___gxx_personality_v0", referenced from: ___gxx_personality_v0$non_lazy_ptr in libSkeleton.a(ControlScene.o) ___gxx_personality_v0$non_lazy_ptr in libSkeleton.a(MenuLayer.o) "___cxa_begin_catch", referenced from: std::_Deque_base<operation_t, std::allocator<operation_t> >::_M_create_nodes(operation_t**, operation_t**)in libSkeleton.a(ControlScene.o) std::_Deque_base<operation_t, std::allocator<operation_t> >::_M_initialize_map(unsigned long)in libSkeleton.a(ControlScene.o) ld: symbol(s) not found collect2: ld returned 1 exit status If anybody could offer some insight as to why these problems are occuring, I'd appreciate it. Thanks, helixed

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  • UITableView's NSString memory leak on iphone when encoding with NSUTF8StringEncoding

    - by vince
    my UITableView have serious memory leak problem only when the NSString is NOT encoding with NSASCIIStringEncoding. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"cell"; UILabel *textLabel1; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; textLabel1 = [[UILabel alloc] initWithFrame:CGRectMake(105, 6, 192, 22)]; textLabel1.tag = 1; textLabel1.textColor = [UIColor whiteColor]; textLabel1.backgroundColor = [UIColor blackColor]; textLabel1.numberOfLines = 1; textLabel1.adjustsFontSizeToFitWidth = NO; [textLabel1 setFont:[UIFont boldSystemFontOfSize:19]]; [cell.contentView addSubview:textLabel1]; [textLabel1 release]; } else { textLabel1 = (UILabel *)[cell.contentView viewWithTag:1]; } NSDictionary *tmpDict = [listOfInfo objectForKey:[NSString stringWithFormat:@"%@",indexPath.row]]; textLabel1.text = [tmpDict objectForKey:@"name"]; return cell; } -(void) readDatabase { NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDir = [documentPaths objectAtIndex:0]; databasePath = [documentsDir stringByAppendingPathComponent:[NSString stringWithFormat:@"%@",myDB]]; sqlite3 *database; if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) { const char sqlStatement = [[NSString stringWithFormat:@"select id,name from %@ order by orderid",myTable] UTF8String]; sqlite3_stmt *compiledStatement; if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) { while(sqlite3_step(compiledStatement) == SQLITE_ROW) { NSString *tmpid = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 0)]; NSString *tmpname = [NSString stringWithCString:(const char *)sqlite3_column_text(compiledStatement, 1) encoding:NSUTF8StringEncoding]; [listOfInfo setObject:[[NSMutableDictionary alloc] init] forKey:tmpid]; [[listOfInfo objectForKey:tmpid] setObject:[NSString stringWithFormat:@"%@", tmpname] forKey:@"name"]; } } sqlite3_finalize(compiledStatement); debugNSLog(@"sqlite closing"); } sqlite3_close(database); } when i change the line NSString *tmpname = [NSString stringWithCString:(const char *)sqlite3_column_text(compiledStatement, 1) encoding:NSUTF8StringEncoding]; to NSString *tmpname = [NSString stringWithCString:(const char *)sqlite3_column_text(compiledStatement, 1) encoding:NSASCIIStringEncoding]; the memory leak is gone i tried NSString stringWithUTF8String and it still leak. i've also tried: NSData *dtmpname = [NSData dataWithBytes:sqlite3_column_blob(compiledStatement, 1) length:sqlite3_column_bytes(compiledStatement, 1)]; NSString *tmpname = [[[NSString alloc] initWithData:dtmpname encoding:NSUTF8StringEncoding] autorelease]; and the problem remains, the leak occur when u start scrolling the tableview. i've actually tried other encoding and it seems that only NSASCIIStringEncoding works(no memory leak) any idea how to get rid of this problem?

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  • Attaching .swf assets to Flex3 by calling getDefinitionByName()

    - by Alexander Farber
    Hello! Does anybody please know, how could you attach symbols from an .swf file in the Actionscript part of your Flex3 file? I've prepared a simple test case demonstrating my problem. Everything works (there are icons at the 4 buttons, there is a red circle) - except the getDefinitionByName() part. My target is to attach a symbol from library "dynamically" - i.e. depending at the value of the suit variable at the runtime. Thank you, Alex Symbols.as: package { public class Symbols { [Embed('../assets/symbols.swf', symbol='spades')] public static const SPADES:Class; [Embed('../assets/symbols.swf', symbol='clubs')] public static const CLUBS:Class; [Embed('../assets/symbols.swf', symbol='diamonds')] public static const DIAMONDS:Class; [Embed('../assets/symbols.swf', symbol='hearts')] public static const HEARTS:Class; } } TestCase.mxml: <?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="onCreationComplete();"> <mx:Script> <![CDATA[ private function onCreationComplete():void { var sprite:Sprite = new Sprite(); var g:Graphics = sprite.graphics; g.lineStyle(1, 0xFF0000); g.beginFill(0xFF0000); g.drawCircle(100, 100, 20); g.endFill(); spriteHolder.addChild(sprite); // XXX stuff below not working, can it be fixed? var suit:String = "SPADES"; var mc:MovieClip = new (getDefinitionByName("Symbols.SPADES") as Class); spriteHolder.addChild(mc); } ]]> </mx:Script> <mx:VBox width="100%"> <mx:Button label="1" icon="{Symbols.SPADES}" /> <mx:Button label="2" icon="{Symbols.CLUBS}" /> <mx:Button label="3" icon="{Symbols.DIAMONDS}" /> <mx:Button label="4" icon="{Symbols.HEARTS}" /> <mx:UIComponent id="spriteHolder" width="200" height="200"/> </mx:VBox> </mx:Application>

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  • Extracting pair member in lambda expressions and template typedef idiom

    - by Nazgob
    Hi, I have some complex types here so I decided to use nifty trick to have typedef on templated types. Then I have a class some_container that has a container as a member. Container is a vector of pairs composed of element and vector. I want to write std::find_if algorithm with lambda expression to find element that have certain value. To get the value I have to call first on pair and then get value from element. Below my std::find_if there is normal loop that does the trick. My lambda fails to compile. How to access value inside element which is inside pair? I use g++ 4.4+ and VS 2010 and I want to stick to boost lambda for now. #include <vector> #include <algorithm> #include <boost\lambda\lambda.hpp> #include <boost\lambda\bind.hpp> template<typename T> class element { public: T value; }; template<typename T> class element_vector_pair // idiom to have templated typedef { public: typedef std::pair<element<T>, std::vector<T> > type; }; template<typename T> class vector_containter // idiom to have templated typedef { public: typedef std::vector<typename element_vector_pair<T>::type > type; }; template<typename T> bool operator==(const typename element_vector_pair<T>::type & lhs, const typename element_vector_pair<T>::type & rhs) { return lhs.first.value == rhs.first.value; } template<typename T> class some_container { public: element<T> get_element(const T& value) const { std::find_if(container.begin(), container.end(), bind(&typename vector_containter<T>::type::value_type::first::value, boost::lambda::_1) == value); /*for(size_t i = 0; i < container.size(); ++i) { if(container.at(i).first.value == value) { return container.at(i); } }*/ return element<T>(); //whatever } protected: typename vector_containter<T>::type container; }; int main() { some_container<int> s; s.get_element(5); return 0; }

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  • Possible reasons for tellg() failing?

    - by Andreas Bonini
    ifstream::tellg() is returning -13 for a certain file. Basically, I wrote a utility that analyzes some source code; I open all files alphabetically, I start with "Apple.cpp" and it works perfectly.. But when it gets to "Conversion.cpp", always on the same file, after reading one line successfully tellg() returns -13. The code in question is: for (int i = 0; i < files.size(); ++i) { /* For each .cpp and .h file */ TextIFile f(files[i]); while (!f.AtEof()) // When it gets to conversion.cpp (not on the others) // first is always successful, second always fails lines.push_back(f.ReadLine()); The code for AtEof is: bool AtEof() { if (mFile.tellg() < 0) FATAL(format("DEBUG - tellg(): %d") % mFile.tellg()); if (mFile.tellg() >= GetSize()) return true; return false; } After it reads successfully the first line of Conversion.cpp, it always crashes with DEBUG - tellg(): -13. This is the whole TextIFile class (wrote by me, the error may be there): class TextIFile { public: TextIFile(const string& path) : mPath(path), mSize(0) { mFile.open(path.c_str(), std::ios::in); if (!mFile.is_open()) FATAL(format("Cannot open %s: %s") % path.c_str() % strerror(errno)); } string GetPath() const { return mPath; } size_t GetSize() { if (mSize) return mSize; const size_t current_position = mFile.tellg(); mFile.seekg(0, std::ios::end); mSize = mFile.tellg(); mFile.seekg(current_position); return mSize; } bool AtEof() { if (mFile.tellg() < 0) FATAL(format("DEBUG - tellg(): %d") % mFile.tellg()); if (mFile.tellg() >= GetSize()) return true; return false; } string ReadLine() { string ret; getline(mFile, ret); CheckErrors(); return ret; } string ReadWhole() { string ret((std::istreambuf_iterator<char>(mFile)), std::istreambuf_iterator<char>()); CheckErrors(); return ret; } private: void CheckErrors() { if (!mFile.good()) FATAL(format("An error has occured while performing an I/O operation on %s") % mPath); } const string mPath; ifstream mFile; size_t mSize; }; Platform is Visual Studio, 32 bit, Windows. Edit: Works on Linux. Edit: I found the cause: line endings. Both Conversion and Guid and others had \n instead of \r\n. I saved them with \r\n instead and it worked. Still, this is not supposed to happen is it?

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  • linking error in zxing while trying to use it in my project iphone

    - by Usman
    Hi, In My Project i need bar-code scanning. so i use zxing library but i m heaving some linking error and its getting me crazy. error is Undefined symbols: "zxing::BinaryBitmap::BinaryBitmap(zxing::Ref<zxing::Binarizer>)", referenced from: -[Decoder decode:] in Decoder.o "zxing::LuminanceSource::LuminanceSource()", referenced from: GrayBytesMonochromeBitmapSource::GrayBytesMonochromeBitmapSource(unsigned char const*, int, int, int)in GrayBytesMonochromeBitmapSource.o "zxing::qrcode::QRCodeReader::decode(zxing::Ref<zxing::BinaryBitmap>)", referenced from: -[Decoder decode:] in Decoder.o "zxing::LuminanceSource::~LuminanceSource()", referenced from: GrayBytesMonochromeBitmapSource::~GrayBytesMonochromeBitmapSource()in GrayBytesMonochromeBitmapSource.o GrayBytesMonochromeBitmapSource::~GrayBytesMonochromeBitmapSource()in GrayBytesMonochromeBitmapSource.o "zxing::ReaderException::~ReaderException()", referenced from: -[Decoder decode:] in Decoder.o -[Decoder decode:] in Decoder.o "zxing::String::getText()", referenced from: -[Decoder decode:] in Decoder.o "typeinfo for zxing::LuminanceSource", referenced from: typeinfo for GrayBytesMonochromeBitmapSourcein GrayBytesMonochromeBitmapSource.o "vtable for zxing::IllegalArgumentException", referenced from: __ZTVN5zxing24IllegalArgumentExceptionE$non_lazy_ptr in Decoder.o "typeinfo for zxing::ReaderException", referenced from: GCC_except_table1 in Decoder.o "vtable for zxing::Exception", referenced from: __ZTVN5zxing9ExceptionE$non_lazy_ptr in Decoder.o "zxing::LuminanceSource::copyMatrix()", referenced from: vtable for GrayBytesMonochromeBitmapSourcein GrayBytesMonochromeBitmapSource.o "zxing::Result::getText()", referenced from: -[Decoder decode:] in Decoder.o "zxing::GlobalHistogramBinarizer::GlobalHistogramBinarizer(zxing::Ref<zxing::LuminanceSource>)", referenced from: -[Decoder decode:] in Decoder.o "zxing::IllegalArgumentException::~IllegalArgumentException()", referenced from: -[Decoder decode:] in Decoder.o -[Decoder decode:] in Decoder.o "zxing::Result::getResultPoints()", referenced from: -[Decoder decode:] in Decoder.o "typeinfo for zxing::IllegalArgumentException", referenced from: GCC_except_table1 in Decoder.o "zxing::Exception::what() const", referenced from: -[Decoder decode:] in Decoder.o -[Decoder decode:] in Decoder.o "vtable for zxing::ReaderException", referenced from: __ZTVN5zxing15ReaderExceptionE$non_lazy_ptr in Decoder.o "zxing::qrcode::QRCodeReader::QRCodeReader()", referenced from: -[Decoder decode:] in Decoder.o "zxing::qrcode::QRCodeReader::~QRCodeReader()", referenced from: -[Decoder decode:] in Decoder.o -[Decoder decode:] in Decoder.o ld: symbol(s) not found collect2: ld returned 1 exit status "zxing::BinaryBitmap::BinaryBitmap(zxing::Ref<zxing::Binarizer>)", referenced from: -[Decoder decode:] in Decoder.o "zxing::LuminanceSource::LuminanceSource()", referenced from: GrayBytesMonochromeBitmapSource::GrayBytesMonochromeBitmapSource(unsigned char const*, int, int, int)in GrayBytesMonochromeBitmapSource.o "zxing::qrcode::QRCodeReader::decode(zxing::Ref<zxing::BinaryBitmap>)", referenced from: -[Decoder decode:] in Decoder.o "zxing::LuminanceSource::~LuminanceSource()", referenced from: GrayBytesMonochromeBitmapSource::~GrayBytesMonochromeBitmapSource()in GrayBytesMonochromeBitmapSource.o GrayBytesMonochromeBitmapSource::~GrayBytesMonochromeBitmapSource()in GrayBytesMonochromeBitmapSource.o "zxing::ReaderException::~ReaderException()", referenced from: -[Decoder decode:] in Decoder.o -[Decoder decode:] in Decoder.o "zxing::String::getText()", referenced from: -[Decoder decode:] in Decoder.o "typeinfo for zxing::LuminanceSource", referenced from: typeinfo for GrayBytesMonochromeBitmapSourcein GrayBytesMonochromeBitmapSource.o "vtable for zxing::IllegalArgumentException", referenced from: __ZTVN5zxing24IllegalArgumentExceptionE$non_lazy_ptr in Decoder.o "typeinfo for zxing::ReaderException", referenced from: GCC_except_table1 in Decoder.o "vtable for zxing::Exception", referenced from: __ZTVN5zxing9ExceptionE$non_lazy_ptr in Decoder.o "zxing::LuminanceSource::copyMatrix()", referenced from: vtable for GrayBytesMonochromeBitmapSourcein GrayBytesMonochromeBitmapSource.o "zxing::Result::getText()", referenced from: -[Decoder decode:] in Decoder.o "zxing::GlobalHistogramBinarizer::GlobalHistogramBinarizer(zxing::Ref<zxing::LuminanceSource>)", referenced from: -[Decoder decode:] in Decoder.o "zxing::IllegalArgumentException::~IllegalArgumentException()", referenced from: -[Decoder decode:] in Decoder.o -[Decoder decode:] in Decoder.o "zxing::Result::getResultPoints()", referenced from: -[Decoder decode:] in Decoder.o "typeinfo for zxing::IllegalArgumentException", referenced from: GCC_except_table1 in Decoder.o "zxing::Exception::what() const", referenced from: -[Decoder decode:] in Decoder.o -[Decoder decode:] in Decoder.o "vtable for zxing::ReaderException", referenced from: __ZTVN5zxing15ReaderExceptionE$non_lazy_ptr in Decoder.o "zxing::qrcode::QRCodeReader::QRCodeReader()", referenced from: -[Decoder decode:] in Decoder.o "zxing::qrcode::QRCodeReader::~QRCodeReader()", referenced from: -[Decoder decode:] in Decoder.o -[Decoder decode:] in Decoder.o ld: symbol(s) not found collect2: ld returned 1 exit status i m trying to resolve this for last two day. i think i m missing some library or some file. can any one point me out what i m doing wrong. Usman

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  • could I know which file is altered using fsevent?

    - by Frost Li
    I get the directory path from fsevent, such as "/User/Data/" But what I really want is "/User/Data/change.txt" I have read the programming guide, it said typedef void ( *FSEventStreamCallback )( ConstFSEventStreamRef streamRef, void *clientCallBackInfo, size_t numEvents, void *eventPaths, const FSEventStreamEventFlags eventFlags[], const FSEventStreamEventId eventIds[]); eventPaths An array of paths to the directories in which event(s) occurred. is there any method to find out which file is altered? thanks!!!! I have stuck to it for so long..

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  • How to use CWnd::CreateEx

    - by chitra
    I was using CreateEx( 0, className, "XXX", WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN, rect, parent, 0); in Visual C++ 6.0. when i port the same to VS 2008.., its giving an error message saying that.. error C2664: 'BOOL CWnd::CreateEx(DWORD,LPCTSTR,LPCTSTR,DWORD,const RECT &,CWnd *,UINT,LPVOID)' : cannot convert parameter 3 from 'const char [7]' to 'LPCTSTR' how to rectify the same thanks Chitra

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  • Specialization of template after instantiation?

    - by Onur Cobanoglu
    Hi, My full code is too long, but here is a snippet that will reflect the essence of my problem: class BPCFGParser { public: ... ... class Edge { ... ... }; class ActiveEquivClass { ... ... }; class PassiveEquivClass { ... ... }; struct EqActiveEquivClass { ... ... }; struct EqPassiveEquivClass { ... ... }; unordered_map<ActiveEquivClass, Edge *, hash<ActiveEquivClass>, EqActiveEquivClass> discovered_active_edges; unordered_map<PassiveEquivClass, Edge *, hash<PassiveEquivClass>, EqPassiveEquivClass> discovered_passive_edges; }; namespace std { template <> class hash<BPCFGParser::ActiveEquivClass> { public: size_t operator()(const BPCFGParser::ActiveEquivClass & aec) const { } }; template <> class hash<BPCFGParser::PassiveEquivClass> { public: size_t operator()(const BPCFGParser::PassiveEquivClass & pec) const { } }; } When I compile this code, I get the following errors: In file included from BPCFGParser.cpp:3, from experiments.cpp:2: BPCFGParser.h:408: error: specialization of ‘std::hash<BPCFGParser::ActiveEquivClass>’ after instantiation BPCFGParser.h:408: error: redefinition of ‘class std::hash<BPCFGParser::ActiveEquivClass>’ /usr/include/c++/4.3/tr1_impl/functional_hash.h:44: error: previous definition of ‘class std::hash<BPCFGParser::ActiveEquivClass>’ BPCFGParser.h:445: error: specialization of ‘std::hash<BPCFGParser::PassiveEquivClass>’ after instantiation BPCFGParser.h:445: error: redefinition of ‘class std::hash<BPCFGParser::PassiveEquivClass>’ /usr/include/c++/4.3/tr1_impl/functional_hash.h:44: error: previous definition of ‘class std::hash<BPCFGParser::PassiveEquivClass>’ Now I have to specialize std::hash for these classes (because standard std::hash definition does not include user defined types). When I move these template specializations before the definition of class BPCFGParser, I get a variety of errors for a variety of different things tried, and somewhere (http://www.parashift.com/c++-faq-lite/misc-technical-issues.html) I read that: Whenever you use a class as a template parameter, the declaration of that class must be complete and not simply forward declared. So I'm stuck. I cannot specialize the templates after BPCFGParser definition, I cannot specialize them before BPCFGParser definition, how may I get this working? Thanks in advance, Onur

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  • Accessing not Non-QObject-based objects from Qt Script

    - by uni
    Is there any nice and simple way to access non QObject-based classes, such as QXmlQuery, QDateTime etc. from Qt Script? The only way I see is to wrap QXmlQuery in another class that inherits QObject and declare as slot every function which I need to access from Qt Script: void MyXmlQuery::setQuery ( const QString & sourceCode, const QUrl & documentURI ) { realxmlquery_.setQuery(sourceCode, documentURI); }

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  • How to linebreak long string constructs ?

    - by iFloh
    I am editing SQLite SQL statements of substantial length. How can I break these into several lines to allow comfortablt editing? const char *sql = "SELECT arguments arguments arguments arguments arguments arguments arguments arguments arguments arguments FROM a, b, WHERE condition condition condition condition condition condition condition" into const char *sql = "SELECT arguments arguments arguments arguments arguments arguments arguments arguments arguments arguments FROM a, b WHERE condition condition condition" cheers

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  • integer constant does 'not reduce to an integer'

    - by Dan Morgan
    I use this code to set my constants // Constants.h extern NSInteger const KNameIndex; // Constants.m NSInteger const KNameIndex = 0; And in a switch statement within a file that imports the Constant.h file I have this: switch (self.sectionFromParentTable) { case KNameIndex: self.types = self.facilityTypes; break; ... I get error at compile that read this: "error:case label does not reduce to an integer constant" Any ideas what might be messed up?

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  • How to get MinValue/MaxValue of a certain ValueType via reflection?

    - by marco.ragogna
    I need to this at runtime. I checked using Reflector and value types line like Int16, for example, should contain <Serializable, StructLayout(LayoutKind.Sequential), ComVisible(True)> _ Public Structure Int16 Implements IComparable, IFormattable, IConvertible, IComparable(Of Short), IEquatable(Of Short) Public Const MaxValue As Short = &H7FFF Public Const MinValue As Short = -32768 End Structure But the following code is not working Dim dummyValue = Activator.CreateInstance(GetType(UInt16)) Dim minValue As IComparable = DirectCast(dummyValue.GetType.GetProperty("MinValue").GetValue(dummyValue, Nothing), IComparable) any idea how to solve?

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  • How to declare NSString constants for passing to NSNotificationCenter

    - by synic
    I've got the following in my .h file: #ifndef _BALANCE_NOTIFICATION #define _BALANCE NOTIFICATION const NSString *BalanceUpdateNotification #endif and the following in my .m file: const NSString *BalanceUpdateNotification = @"BalanceUpdateNotification"; I'm using this with the following codes: [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(updateBalance:) name:BalanceUpdateNotification object:nil]; and [[NSNotificatoinCenter defaultCenter] postNotificationName:BalanceUpdateNotificatoin object:self userInfo:nil]; Which works, but it gives me a warning: Passing argument 1 of 'postNotificationName:object:userInfo' discards qualifiers from pointer target type So, I can cast it to (NSString *), but I'm wondering what the proper way to do this is.

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  • Inherited TShape.Paint does not work after overriding Shape property

    - by DarkWalker
    I'm to code a TExpandedShape class inherited from TShape. TExpandedShape must act like TShape and be able to draw extra shapes: Polygon and Star. Here is my code unit ExpandedShape; interface uses SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls, Forms, Dialogs, ExtCtrls, Windows; type TExpandedShapeType = ( stRectangle, stSquare, stRoundRect, stRoundSquare, stEllipse, stCircle, stPolygon, stStar ); TExpandedShape = class(TShape) private FShape: TExpandedShapeType; FEdgeCount: integer; procedure SetShape(const Value: TExpandedShapeType); procedure SetEdgeCount(const Value: integer); public procedure Paint; override; published property Shape : TExpandedShapeType read FShape write SetShape;// default stPolygon; property EdgeCount : integer read FEdgeCount write SetEdgeCount default 5; end; procedure Register; implementation procedure Register; begin RegisterComponents('Course', [TExpandedShape]); end; // TExpandedShape procedure TExpandedShape.Paint; begin case Shape of stStar : begin {Draw Star} end; stPolygon : begin {Draw Polygon} end; else begin {It is supposed to draw Circle, Rectangle etc, but it does not} inherited; end; end; end; procedure TExpandedShape.SetEdgeCount(const Value: integer); begin FEdgeCount := Value; Repaint; end; procedure TExpandedShape.SetShape(const Value: TExpandedShapeType); begin FShape := Value; Repaint; end; end. So, what is wrong? IMO TShape.Paint checks private value like FShape in case section and then decides what to draw. When inherited Paint method is called in my code it checks FShape value sees default 0 value [stRectangle] in there and draws it. PS: I did solve it with blackmagic way using Shape1 property instead of Shape one and if Shape1 value is not stPolygon or stStar i do like this: begin Shape := TShapeType(Shape1); inherited end; But this option is not really an option. I need a good short nice-looking one.

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  • Inline instantiation of a constant List

    - by Roflcoptr
    I try to do something like this: public const List<String> METRICS = new List<String>() { SourceFile.LOC, SourceFile.MCCABE, SourceFile.NOM, SourceFile.NOA, SourceFile.FANOUT, SourceFile.FANIN, SourceFile.NOPAR, SourceFile.NDC, SourceFile.CALLS }; But unfortunately this doesn't work: FileStorer.METRICS' is of type 'System.Collections.Generic.List<string>'. A const field of a reference type other than string can only be initialized with null. How can I solve this problem?

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  • Qt double click check left button mouse

    - by Alex Ivasyuv
    I need to run slot only on doubleClick with left button mouse, instead of both. connect(this -> myComponent, SIGNAL (doubleClicked (const QModelIndex & )), this, SLOT (performSomeAction(const QModelIndex & ))); With this event, double click works in both cases, but needed only with left button click. How I can do it? this - myComponent = QTableView

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  • subclassing QList and operator+ overloading

    - by Milen
    I would like to be able to add two QList objects. For example: QList<int> b; b.append(10); b.append(20); b.append(30); QList<int> c; c.append(1); c.append(2); c.append(3); QList<int> d; d = b + c; For this reason, I decided to subclass the QList and to overload the operator+. Here is my code: class List : public QList<int> { public: List() : QList<int>() {} // Add QList + QList friend List operator+(const List& a1, const List& a2); }; List operator+(const List& a1, const List& a2) { List myList; myList.append(a1[0] + a2[0]); myList.append(a1[1] + a2[1]); myList.append(a1[2] + a2[2]); return myList; } int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); List b; b.append(10); b.append(20); b.append(30); List c; c.append(1); c.append(2); c.append(3); List d; d = b + c; List::iterator i; for(i = d.begin(); i != d.end(); ++i) qDebug() << *i; return a.exec(); } , the result is correct but I am not sure whether this is a good approach. I would like to ask whether there is better solution?

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