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QT中UDP的 error: undefined reference to `_imp___ZN1錯誤

Debug:的錯誤資訊

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

解決方案:

貌似連結錯誤。檢查.pro檔案中是否缺少
QT += network