undefined reference to `_imp___ZN10QTcpSocketD1Ev'
undefined reference to `_imp___ZN10QTcpSocketC1EP7QObject'
undefined reference to `_imp___ZN10QTcpSocketD1Ev'
undefined reference to `_imp___ZN10QTcpSocketD1Ev'
undefined reference to `_imp___ZN10QTcpSocketD1Ev'
undefined reference to `_imp___ZN10QTcpSocketD1Ev'
undefined reference to `_imp___ZN10QTcpSocketD1Ev'
undefined reference to `_imp___ZN15QAbstractSocket13connectToHostERK7QStringt6QFlagsIN9QIODevice12OpenModeFlagEE'
undefined reference to `_imp___ZN15QAbstractSocket5closeEv'
collect2: ld returned 1 exit status
解决方法:
QT += network
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