I would like to create a gui application with Qt, using opencv on Windows XP. I used both Qt and opencv before, but never together. Long story short, I'm unable to get opencv work with Qt.
As on all the forums I searched there are just little pieces of information scattered around, usually with no answer, I summarize here all the steps I've taken.
Downloaded the Qt SDK (4.6.3) for Windows, and used it for some time, successfully.
Downloaded the opencv 2.3.1 megapack for Windows, complete with binaries. I managed to compile my Qt project including opencv successfully, but any opencv function call resulted in a crash. I read on some forums that the binaries in the Windows megapack don't support Qt, and I have to build opencv myself
I downloaded the latest version of CMake (2.8).
I downloaded the source of opencv from here: http://code.opencv.org/svn/opencv/branches/2.3/
I downloaded the source for the version of Qt I had (4.6.3)
I found my old version of visual Studio 2005
I created a VS2005 project with CMake, checking the support for Qt. (WITH_QT checked)
I built opencv in VS2005. It created most of the libraries, but not all. Highgui was among the failed ones. The problem: Qt\4.6.3\src\corelib\global\qconfig.h was not found. There was no qconfig.h at all in the source I downloaded! I found some templates qconfig-large.h, qconfig-small.h etc., so I renamed one of them to qconfig.h. Now I got a screen full of linker errors.
I downloaded the latest Qt source instead (4.8.1). Now there is a source file qbenchmark.h that includes QtTest/qbenchmarkmetric.h which cannot be found.
I gave up, and tried MinGW.
I downloaded the latest MinGW (2011.11.18)
I set CMake to generate a MinGW makefile, but I got the following error:
.
CMake Error at C:/Program Files/CMake 2.8/share/cmake-2.8/Modules/Platform/Windows-g++.cmake:1 (INCLUDE):
include could not find load file:
C:/Program Files/CMake 2.8/share/cmake-2.8/Modules/Platform/Windows-gcc.cmake
Call Stack (most recent call first):
C:/Program Files/CMake 2.8/share/cmake-2.8/Modules/CMakeCXXInformation.cmake:59 (INCLUDE)
True, there is a Windows-g++.cmake file in the Modules/Platform directory, but it references Windows-gcc.cmake which does not exist!
Is there anyone who managed to build opencv with Qt support on Windows, and if yes, how?
Edit:
The problem is definitely with the Qt source. I managed to generate a MinGW makefile, and the build went all OK until it stopped in src/testlib/qtestsystem.h because there was an include for QtCore/qelapsedtimer.h which file is in a completely different directory! Does Qt release incomplete sources, or did I do something wrong?
Edit2
My torment continues. I cleaned everything and started anew. This time without even trying Visual Studio.
I downloaded the latest Qt libs with source (4.8.1)
I downloaded the latest MinGW (2011.11.18)
With CMake I successfully created a Makefile, and built it with MinGW. I got some shiny new libs (libopencv_core231, etv.). I was very happy, but how wrong I was to celebrate that soon!!
I downloaded the latest Qt SDK (strangely, it was 4.8.0, so I set Qt Creator to use the 4.8.1) and created a test program without opencv to see if it works. It worked!
I tried using opencv, just reading and displaying an image. It didn't work. exited with code -1073741511
I tried running the .exe directly, outside of Qt Creator. It complained of a missing libstdc++-6.dll
I did a search for it, and found on in my MinGW install (c:\mingw\bin, 958 KB), and one in my Qt install (c:\qt\mingw\bin, 793 KB) - this mingw came bundled with Qt.
I tried both, by copying them in the same folder where my .exe is, but neither worked. I got "The procedure entry point _ZNSt9exceptionD2Ev could not be located in the dynamic link library libstdc++-6.dll." with both. This was in debug, so I tried release, and I got a similar error, with some other entry point not found.
I searched the forums, and I found suggestions that I should link libstdc++ statically. I inserted -static-libgcc -static-libstdc++ at the lines QMAKE_LFLAGS = and QMAKE_LFLAGS_DEBUG = in the file c:\Qt\mkspecs\win32-g++\qmake.conf. This had no effect at all, even after restarting Qt Creator and rebuilding. If I don't copy the libstdc++-6.dll, it still requires it.
Of course, my simple test program without opencv runs from the exe without needing any libstdc++-6.dll, so that means my opencv build is responsible? I wanted to build opencv anew, but I cannot find any CMake settings referring to libstdc++ !
It might be a clue:
When using one of the libstdc++-6.dll files, the error about a missing entrypoint mentions QtGui4.dll. I have a debug build, so it should be QtGui*d*4.dll, shouldn't it? Are there different libstdc++s for debug and release? Either way, I tried to build release, but it didn't work either, same error
Is there no single person on this planet who tried using Qt with QtCreator and opencv 2.3 together on Windows xp, and succeeded? From searching all the forums and Qt archives, I could not find anyone. I'm ready to do the development in Linux, but I'll need a Windows release sooner or later anyway.
I'm trying to resist the temptation of the dark side, which whispers into my ears to forget Qt, MinGW, g++, opencv and try to hack together something in Visual Basic. Oh, the horrors!
Just FYI, I went basically through the same nightmare of combining Qt and OpenCV. This was my experience:
I downloaded the Qt SDK 4.7.4 with Qt Creator 2.4.1 and installed it, no problem.
I downloaded and installed OpenCV 2.4.2 and not knowing that it already came with MinGW...
I downloaded the MinGW compiler which of course had a different version than the one which came already with Qt
This completely messed up my CMake, even when I explicitly told CMake to use the Qt gcc.exe and g++.exe it also used some stuff from my freshly installed MinGW. Probably because I eagerly added every directory to my PATH variable. What a fool I was!
CMake was not able to generate any useful files, so I gave up and installed the OpenCV superpack, hoping this would make things easier.
6.I spent hours wondering, why Qt and OpenCV from the superpack didnt work properly together. I never quite understood. I had the same errors that other users describe here, like console programs crashing as soon as some OpenCV was included. The strange thing is, that I could start the executable manually from FileExplorer (I added all .dlls you could think of to the project folder: opencv_core242.dll, opencv_highgui242.dll, QtCore4.dll, QtGui4.dll and so on...) BUT I could not launch my little test program from within the Qt Creator environment.
I analysed if there was a problem with my DLLs using depends.exe and found out that even though I configured everything to be in DEBUG using the MinGW compiler, my program still tried to use QtCore4.dll and not QtCore4d.dll... So my best guess was, that it was mixing debug and release version.
I gave up using the superpack and again tried to use CMAKE first and then build OpenCV using the Qt MinGW version AND making sure to setup everything for Debug mode and enable the QT option. But no luck with that so far
I stopped using MinGW and switched over to MSVC2010, which works better. However I am still not able to debug the program since the MSVC2010 debugger engine seems to be missing. I dont really know how to manually add this but I am still working on it
So what I can definitely tell is that using Qt and OpenCV for somebody who has little experience is far from trivial!
You should build OpenCV from source, as you already did, it is no hassle. Note that recent versions of OpenCV can be built with and w/o Qt. Highgui optionally uses Qt! It is your choice if you build with or without Qt.
I used Qt libraries together with OpenCV for long time now. I never went for the SDK, instead I used the libs which are built for corresponding VS version. See here: http://qt.nokia.com/downloads/downloads#qt-lib
You can have it for VS2008 and VS2010, but earlier versions are also available built for VS2005. Old versions of Visual Studio suck so hard, why use them anyway.
Then I never had problems pulling it together in a CMake project. It goes along the lines of:
find_package(OpenCV)
find_package(Qt4 ${VOLE_MINIMUM_QT_VERSION} COMPONENTS QtCore QtGui)
find_package(Qt4 ${VOLE_MINIMUM_QT_VERSION} COMPONENTS QtOpenGL)
...
qt4_wrap_cpp(moc_sources ${vole_module_moc_sources})
qt4_wrap_ui(uic_sources ${vole_module_ui_sources})
qt4_add_resources(rcc_sources ${vole_module_rcc_sources})
You know, the usual stuff.
Five man weeks later you may probably get it run under Windows, while under GNU/Linux it is three commands in the shell.
You might have an easier time configuring Qt Creator with OpenCV. This post shows how to achieve that, step-by-step! It displays several screenshots to aid in the process too.
Related
I'm currently struggling to build OpenCV for the UWP.
I already googled quite a lot and found Microsoft's OpenCV Github Repo which tecnically should do the magic. However, this repo and pretty much everything else I found in this regard are outdated (Visual Studio 2015, old OpenCV versions etc.). I need to use OpenCV 3.3 because it's a cross platform project and I don't want to recompile everything else solely because of an outdated git repo.
Can anyone explain the process of building OpenCV using CMake from the official repo for the UWP?
My first attempt was to simply use the Windows Dlls, however my application than shouts "Failed to load module" at me. Then, I tried to build OpenCV the Visual Studio Project files as stated here and here. However, this doesn't do it for me as it throws the following error:
CMake Error at cmake/OpenCVUtils.cmake:440 (if):
if given arguments:
"(" "OR" "OFF" ")"
Unknown arguments specified
Call Stack (most recent call first):
CMakeLists.txt:317 (OCV_OPTION)
It also tells me to check the CMakeOutput.log but there it's 0 errors everywhere.
If someone could tell me either how to get rid of this error or what to change in the CMake GUI to build OpenCV for UWP, that'd be great!
Edit:
I also tried to compile OpenCV with a platform specific toolchain for WinRT as found in platforms/winrt. It doesn't really change anything though (I'm not even sure if it should), I still get "Unable to load Dll: The specified module could not be found". Maybe GPPK is right in his assumption that it's more an UWP problem than an OpenCV one. Anyways, if anyone knows anything about this, I'd really love to get some help!
Ok, I didn't get an answer yet, so I managed to do it myself (more or less).
Here's how I did it:
Prerequisites
Visual Studio (2017)
UWP SDK
CMake
OpenCV from official repo
Steps
Create a build folder which you want the UWP libraries to built in.
Start PowerShell in this folder and execute the following command (exchange C:\OpenCV with your local OpenCV path): cmake -G "Visual Studio 15 2017" -DCMAKE_SYSTEM_NAME=WindowsStore -DCMAKE_SYSTEM_VERS
ION="10.0" -DCMAKE_VS_EFFECTIVE_PLATFORMS=x86 -DBUILD_TESTS=OFF -DBUILD_PERF_TESTS=OFF C:\OpenCV
If you get the same error message as I did (see question for more details), go to the root CMakeLists.txt in the OpenCV folder and add a # in front of line 317 (OCV_OPTION(ENABLE_PYLINT)). This should fix it, to check, execute the command from above once more.
Ensure that the output claims "Windows RT support YES" and "Building for Microsoft platform: Windows".
Open OpenCV.sln in the build folder. Ensure that all projects are either of type "Windows Store" or "Universal Windows" and build the ALL_BUILD Project twice: Once in Release configuration, and once in Debug. Then build the INSTALL Project.
That's it, you should find the built Dlls in the install folder. Step 3 is probably a bug in OpenCV and will hopefully be fixed in upcoming versions.
I am fairly new to C++ in general (though I am getting used to the basics), but now I am trying to add OpenCV to my projects to access some of the basic image processing features. I have read the documentation so I have a pretty good idea where to start, but I am really stuck with the installation.
I am working with Code::Blocks 16.01, and I have downloaded both CMake 3.4.3 and OpenCV 3.0.0 and 3.1.0. OpenCV has been extracted to "c:\opencv", and I have attempted to finish the build with CMake (using the directions from the OpenCV documentation as well as from several older posts from this site). I am selecting "Codeblocks - MinGW Makefiles" from the list of generators, though I have selected from all of the "Codeblocks" options at one point or another.
Anyway, whenever I try to configure or generate I receive the following error: "The program can't start because libintl-8.dll is missing from your computer." So yeah, I am stuck.
It is worth noting that many, if not all, of the posts I have found refer to a directory named "\x86\mingw\lib", however I cannot find "mingw" in any of the OpenCV downloads (and the most recent is missing "x86" as well) - so none of these posts have been particularly useful to me (for example):
How to compile a program using OpenCV 2.4.3 with Code::Blocks?
Put the path to all the MinGW dll files in your pc's path variable. Check your Code::Blocks installation directory ( C:\Program Files (x86)\CodeBlocks\MinGW\bin ) if it does not exist, you'd have to download and install MinGW separately. You'd have to add the MinGW .dll files to the path environment.
Like the title says, I have been using Qt creator along with a kit that uses the Visual C++ 12.0 (x86_amd64) compiler and I have been trying to get openCV set up so that I can use that library in my project. I downloaded the most recent version of openCV (alpha 3.0.0) and have tried numerous ways of trying to link it to QT, but no matter what I try it fails.
I have tried looking at several tutorials that have been using Cmake to compile the source into binaries, but those have also failed. Since I am using the C++ 12 compiler, is it possible to just use the pre-compiled binaries that come with the download, or do I have to manually compile them? I downloaded it from the OpenCV site and tried to use cmake to compile the binaries, configured with the visual C++ 2012 compiler, but I have no idea where to go after those binaries are generated so that's why I have tried with the binaries you download straight from the site.
Any thoughts or links to tutorials are greatly appreciated, I just can't get this thing to work.
A few things I have tried have been adding
INCLUDEPATH += "C:\OpenCV-3.0.0\opencv\sources\include"
To link to cv.h, and I have these libraries linked because I tried linking all the ones I found in the pre compiled binaries
LIBS += "C:\OpenCV-3.0.0\opencv\build\x86\vc12\lib\opencv_ts300.lib"
"C:\OpenCV-3.0.0\opencv\build\x86\vc12\lib\opencv_ts300d.lib"
"C:\OpenCV-3.0.0\opencv\build\x86\vc12\lib\opencv_world300.lib"
"C:\OpenCV-3.0.0\opencv\build\x86\vc12\lib\opencv_world300d.lib"
I need to use OpenCV with Qt creator, and need some help with OpenCV.
My problem occurs when I run any example or .exe made with OpenCV, after I install OpenCV with CMake (and checking WITH_QT in the process).
For example with the examples included in the installation, when I try to open one I get the following error:
http://answers.opencv.org/upfiles/1413994743487541.png
That says: Procedure entry point not found in the dynamic links library
My S.O. is Windows 8.1, 64 bits
I have tried to reinstall Qt and install differents versions, but the error is the same ever.
But, if I install OpenCV with CMake and don´t check WITH_QT, the examples works perfectly.
I dont know what else can I do!
Thanks!
I just started using Qt Creator for creating C++ GUI programs. I just downloaded it and installed it, but the compiling process is throwing me errors. When I try to compile my project (very simple, just a QLabel on the screen...it's my first project) it comes up with the error:
qtcreator_ctrlc_stub: Command line failed:
C:\Users\andrew\Dropbox\Programming\C++\build-
FirstGUIApp-Desktop_Qt_5_1_1_MSVC2012_32bit-Debug\Makefile 10:04:35:
The process
"C:\Users\andrew\Dropbox\Programming\C++\build-FirstGUIApp-Desktop_Qt_5_1_1_MSVC2012_32bit-Debug\Makefile"
exited with code -1. Error while building/deploying project
FirstGUIApp (kit: Desktop Qt 5.1.1 MSVC2012 32bit) When executing step
'Make'
I hunted around for an answer here and here and a couple other places but I'm just confused about the whole thing. I have a couple of ideas of my own but I don't know how to try my ideas. Here are some of my ideas:
1) MinGW isn't in the path or isn't installed
But, if it isn't in the path, how do I put it in? Where is it? I have Code Blocks installed which has MinGW installed, so could I maybe use it from there?
2) the make file is messed up somehow
Again, what could be wrong and how could I fix it?
3) Qt Creator isn't installed correctly.
Obviously, re-install it, but I want to make sure all other options are tried before, because it took me a very long time to download.
I apologize if I'm sounding noobish or it's a stupid question, but I really am confused with all of this. Please be patient with me and try to explain things well and thoroughly. I'm using Windows 8.1 and downloaded the offline installer. Thanks in advance.
UPDATE
Here is a screenshot of my Qt, how can I tell if it is the visual studio or minGW version?
UPDATE
Here is my MinGW Folder in CodeBlocks. Is this the folder with the compiler or is it something else?
For your ideas:
1: if you downloaded from qtproject with binary. then qt and qt creator should be installed under the C:\Qt\Qt5.1.1 then corresponding minGW should be stay in C:\Qt\Qt5.1.1\Tools\mingw48_32\bin\gcc.exe
this is the directory you need. Remember, QtCreator needs two tools to make sure your project and compile and run, qmake and compiler.
Qmake is tool help you translate .pro file into makefile,
compiler (gcc) minGW use gcc to run the makefile, compile your code to binary.
where to figure out tools you are using are correct?
---> qtcreator --> Tools -> Build&Run -> Kits
in here You should be able find different kits, of course you maybe have only one.
Select one, Double check the Qt Version and Compiler is the one you wish to use.
click Manage next to compiler, Every compiler in the Auto-detect should be ok to use.
If you don't see anyone, add one, click Add, MinGW, put C:\Qt\Qt5.1.1\Tools\mingw48_32\bin\gcc.exe like into path. ABI should auto-set depends on your environment.
Answer to your second question, what's wrong with your makefile, no one knows, you should check your .pro, usually makefile are generated by qmake xx.pro. Double check your .pro file and re-run qmake will solve the problem.
in tools->options->build&run check if minGW is actually there in the compiler and kit list
in the project tab (on the left hand side) you can set the environment for the build click the PATH value and add the path to minGW to it (you may need to add a lib and include var so the standard library gets added)
re run qmake from the build menu
double check you have the correct version it looks like you have the visual studio Qt not the minGW version,
Terminal:(in Linux)
sudo apt-get install build-essential cmake libqt4-dev
i'm sorry i dont know why this code works,but i have the same problem in linux and this code worked.