c – Opencv,未定义引用`cv :: imread(?? cv :: String const&???,int)’

参见英文答案 > error: undefined reference to `cv::imread(std::string const&,int)’                                    3个
>             What is an undefined reference/unresolved external symbol error and how do I fix it?                                    32个
我在QT Opencv中有一个项目,代码正在运行,但我不得不格式化窗口,现在我想再次导入项目,这个错误出现了.

未定义的引用`cv :: imread(cv :: String const&,int)’
在这一行：

@H_323_12@mat = cv::imread(path);

虽然我的代码看起来像这样：

QString caminho = QFileDialog::getOpenFilename(this,tr("Open File"),"",tr("Images (*.png *.tiff)") );

 std::string path = caminho.toStdString();
 mat = cv::imread(path);

我尝试了像“image.png”这样的其他字符串代码,但没有用.

使用OpenCV3,QT5.4,Mingw,Windows8.1

抱歉,我的英文