【已解决】vs2013 error LNK1120: xxx。LNK2019: unresolved external symbol ““public: long __cdecl xxx:xxx)“

问题描述：

visual studio2013+Qt5.9进行ui界面开发的时候报错：

error LNK1120: 3 unresolved externals

error LNK2019: unresolved external symbol "public: long __cdecl SciThresholdDlgl::on_pushButton_getImg_clicked(void)" (?on_pushButton_getImg_clicked@SciThresholdDlgl@@QEAAJXZ) referenced in function "private: static void __cdecl SciThresholdDlgl::qt_static_metacall(class QObject *,enum QMetaObject::Call,int,void * *)" (?qt_static_metacall@SciThresholdDlgl@@CAXPEAVQObject@@W4Call@QMetaObject@@HPEAPEAX@Z)

原因

存在只声明未定义函数

可能是long SciThresholdDlgl::on_pushButton_getImg_clicked(void) 只声明 未定义

解决方案

①定义函数；

②或无用函数注释掉声明即可

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拓展

②error LNK2019: unresolved external symbol "public: long __cdecl SciThresholdDlgl::setLangurage(void)" (?setLangurage@SciThresholdDlgl@@QEAAJXZ) referenced in function "public: __cdecl SciThresholdDlgl::SciThresholdDlgl(class QWidget *)" (??0SciThresholdDlgl@@QEAA@PEAVQWidget@@@Z) D:\BinaryTask\BinaryTask\SciThresholdDlgl.obj BinaryTask

//long setLangurage(); 只声明未定义

③error LNK2019: unresolved external symbol "public: void __cdecl SciThresholdDlgl::ShowHist(void)" (?ShowHist@SciThresholdDlgl@@QEAAXXZ) referenced in function "public: long __cdecl SciThresholdDlgl::ShowImgWnd(class SciImage &)" (?ShowImgWnd@SciThresholdDlgl@@QEAAJAEAVSciImage@@@Z) D:\BinaryTask\BinaryTask\SciThresholdDlgl.obj BinaryTask

//ShowHist(void)；只声明未定义；