Trouble Integrating Qt 5.3.1 with OpenCV 2.4.9 (Solved)

alphaCharlie

To my knowledge, yes.
Thanks for the reply.

To start, I just downloaded the Qt/MinGW pack that came together. This did not work. I then read that the MinGW compiler that came in the bundle was the 32bit version. I then uninstalled Qt and the downloaded Qt without the compiler and got the 64bit version. This also did not work. (All the time I was updating my variable paths)

I also came to the conclusion that it was either the compiler that wasn't working correctly, or that my OpenCV libraries weren't fully defined.

Every time I try something new, it fails at the same place when it tries to link the highgui249.dll libraries.

alphaCharlie

SGaist

Hi and welcome to devnet,

Before going further, what compiler do you have installed ?
What Qt package did you install ?
Did you saw that OpenCV provides pre-built libraries for several compilers ? Did you select the right path when linking to the libraries ?

alphaCharlie

Compiler - MinGW 4.9.1 (32/64bit)
Qt - 5.3

OpenCV 2.4.9 only supplies pre-built libraries for vc10, vc11, and vc12 I believe.

And I am almost positive that I am using the right paths when linking the libraries, which is why I am so confused.

alphaCharlie

SGaist

Then you will have to first compile OpenCV with your MinGW version

alphaCharlie

Alright, well then this might sounds like a dumb question, how do I do that?

SGaist

"Here":http://docs.opencv.org/doc/tutorials/introduction/windows_install/windows_install.html you have the instructions

alphaCharlie

I followed those instructions and was able to compile openCV with minGW using the -make and -install commands quite easily.

After that, am I suppose to do the same process over again but this time including the With_Qt libraries within Cmake?

SGaist

Not necessarily, Qt is used in OpenCV for the highgui library to show controls etc. So if you don't use it in your software there's no need for that.

alphaCharlie

I figured it out. The cause was the wrong library being linked to CMake. With the new installer for 5.3.1, it opts to a default download of winrt_x64, and msvc2013_64.

You need to manually include mingw482_32 when downloading Qt and set the paths to C:\Qt\5.3\mingw482_32 (My path) so that when including the With_Qt, it finds the correct libraries.

Thanks for the help.

SGaist

Nice you found out !

You're welcome !

Now that you have it working, please update the thread title prepending [solved] so other forum users may know a solution has been found :)