QT Creator：无法添加OpenCV dll lib（“文件格式无法识别”）

Question

I'm trying to get openCV 3.1.0 to work in QT Creator 4.4.1 using this tutorial from their official site.

Right now, I'm setting up my project file. The whole file looks identical to the on in the tutorial apart from the last couple of lines, as my openCV build is in another place and it's a different version This is what I got:

INCLUDEPATH += C:\opencv\opencv-3.1.0\build\include

LIBS += -LC:\opencv\opencv-3.1.0\build\x64\vc14\bin \
    libopencv_world310d \

As far as I understand, the "world" module has been introduced to openCV to unify all the different modules into one.

However, when I try to run this, QT produces the following error:

C:\opencv\opencv-3.1.0\build\x64\vc14\bin\opencv_world310d.dll:-1: error: file not recognized: File format not recognized

What am I doing wrong? In the tutorial there's an alternative way to link the libraries which even explicitly states them as .dll files. Why is this a problem?

Answer 1

You need to link to the .lib contained in the lib folder:

LIBS += -LC:\opencv\opencv-3.1.0\build\x64\vc14\lib \

and put the .dll in the PATH, or the same folder of the .exe