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剛才遇到的這個問題，在網上搜索了一下，

有說之前的程式已經運行了，有說pro檔案有問題的，

我找了一會，發現我在標頭檔案中定義了兩個slots，

在cPP檔案中沒有實現。

見nokia論壇

Another reason might be that your source is incomplete and calls method DECLARATIONS that get called but the method IMPLEMENTATIONS are missing.

Declaration is the stuff that you usually put in a header file (method signature without body)
Implementation is the signature with body.

Usually if you look in the linker output, you can find which implementation the linker is missing.

click the "Compile Output" view (Alt+4) to see more detailed info.

這樣，我找到了這個低階錯誤~~~

給我老師的人工智慧教程打call！http://blog.csdn.net/jiangjunshow