Using OpenCV in a Windows Store app with Visual C++

Question

I am trying to use the OpenCV library for some image processing inside my Windows 8 Store app using C++/CX. I am able to build the OpenCV library using Visual C++ 2012 but

Answer 1

I've managed to build a subset of OpenCV for ARM.

I started by getting the subset I was interested in building for Windows Store applications in x86. After pointing CMake at a source download of OpenCV, I used the Visual Studio 11 generator to configure an x86 project. I added a new build option within CMake called TARGET_METRO, and used this to further configure the other projects.

This allowed me to turn off several 3rd-party components I did not want to build, eg:

OCV_OPTION(BUILD_PERF_TESTS   "Build performance tests"  ON  IF (NOT IOS AND NOT TARGET_METRO) )

I turned off WITH_VIDEOINPUT, BUILD_PERF_TESTS, and BUILD_TESTS in this fashion. I also added the definitions mentioned by Raman when TARGET_METRO was on:

if(TARGET_METRO)
    add_definitions(-DWINAPI_FAMILY=WINAPI_FAMILY_APP)
    add_definitions(-D_UNICODE)
endif()

I then proceeded to generate the x86 (Visual Studio 11) version of the project with CMake and started attempting to build the project. You will run into a number of issues, most of which relate to missing APIs in WinRT. Most of these are mechanical changes (for example, swapping out InitializeCriticalSection for InitializeCriticalSectionEx). I wrapped these changes under #if WINAPI_FAMILY == WINAPI_FAMILY_APP so that it would not impact the non-TARGET_METRO build.

When it came time to build for ARM, what I did was launch CMake and use the Visual Studio 11 generator to generate a new project (under a directory named 'ARM') and then began manually editing the resulting project files.

The major changes you need to make are:

• Change all 'Win32' to 'ARM' in all vcxproj files (3rdparty\IlmImf includes filenames which contain 'Win32', be careful to change those instances back)
• For all projects, add true to the Globals propertygroup
• For the ZERO_CHECK project, change ConfigurationType to "DynamicLibrary" instead of "Utility" (as the Utility type will fail to build)

• Add the following at the project level (for each project you want to build for ARM):

  
    
      false
    
    
      Console
      false
      false
    
  
  

• Remove "/machine:X86 " from Link: Additional Options (if it is in there)

• Remove gdi32.lib, winspool.lib, shell32.lib, and comdlg32.lib from additional dependencies (these libs do not exist for ARM)