QString类在Qt4.6和4.7之间的变化

Question

我现在正在尝试用Qt4.7编译sqlitebrowser，在编译运行时我得到了他的错误：

g++ -c -pipe -O2 -Wall -W -DQT_NO_DEBUG -DQT_QT3SUPPORT_LIB -DQT3_SUPPORT -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/local/share/qt4/mkspecs/freebsd-g++ -I. -I/usr/local/include/qt4/QtCore -I/usr/local/include/qt4/QtGui -I/usr/local/include/qt4/Qt3Support -I/usr/local/include/qt4 -Isqlite_source -I.moc -I/usr/local/include -o .obj/extendedmainform.o extendedmainform.cpp
In file included from findform.h:24,
                 from form1.h:31,
                 from extendedmainform.h:4,
                 from extendedmainform.cpp:1:
sqlitedb.h: In constructor 'DBBrowserField::DBBrowserField()':
sqlitedb.h:44: error: call of overloaded 'QString(int)' is ambiguous
/usr/local/include/qt4/QtCore/qstring.h:428: note: candidates are: QString::QString(const QByteArray&)
/usr/local/include/qt4/QtCore/qstring.h:426: note:                 QString::QString(const char*)
/usr/local/include/qt4/QtCore/qstring.h:728: note:                 QString::QString(const QString&)
/usr/local/include/qt4/QtCore/qstring.h:106: note:                 QString::QString(QChar)
/usr/local/include/qt4/QtCore/qstring.h:105: note:                 QString::QString(const QChar*)
sqlitedb.h: In constructor 'DBBrowserIndex::DBBrowserIndex()':
sqlitedb.h:58: error: call of overloaded 'QString(int)' is ambiguous
/usr/local/include/qt4/QtCore/qstring.h:428: note: candidates are: QString::QString(const QByteArray&)
/usr/local/include/qt4/QtCore/qstring.h:426: note:                 QString::QString(const char*)
/usr/local/include/qt4/QtCore/qstring.h:728: note:                 QString::QString(const QString&)
/usr/local/include/qt4/QtCore/qstring.h:106: note:                 QString::QString(QChar)
/usr/local/include/qt4/QtCore/qstring.h:105: note:                 QString::QString(const QChar*)
sqlitedb.h: In constructor 'DBBrowserTable::DBBrowserTable()':
sqlitedb.h:73: error: call of overloaded 'QString(int)' is ambiguous
/usr/local/include/qt4/QtCore/qstring.h:428: note: candidates are: QString::QString(const QByteArray&)
/usr/local/include/qt4/QtCore/qstring.h:426: note:                 QString::QString(const char*)
/usr/local/include/qt4/QtCore/qstring.h:728: note:                 QString::QString(const QString&)
/usr/local/include/qt4/QtCore/qstring.h:106: note:                 QString::QString(QChar)
/usr/local/include/qt4/QtCore/qstring.h:105: note:                 QString::QString(const QChar*)
*** Error code 1

我查看了Qt文档( 4.6和4.7)以查看Qstring构造函数中的任何更改，但我只看到一个新的one overload，所以我的问题是，为了编译它，我需要在sqlitebrowser中进行哪些更改。

Answer 1

根据QString in Qt 4.6的说法，只有one candidate可以将指针作为参数。但是在Qt 4.7中有两个可以接受指针作为参数的QString构造函数。我认为这引发了编译器错误。

您可以强制它像Qt 4.6一样运行，如下所示：

name((const char*) 0)

Answer 2

无论您在创建带有int的QString时，都需要告诉Qt您所说的int是什么意思

如果是要转换为字符串的实际文字数字，请使用QString("%u").arg()函数