opencv:windows下调用cvShowImage等窗口显示函数报错：The function is not implement

自己在windows下用cmake成功编译了opencv 2.4.13.2，但在实际调用cvShowImage函数时报错了：

OpenCV Error: Unspecified error (The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script) in cvNamedWindow, file D:\caffe-static\source\opencv-2.4.13.2\modules\highgui\src\window.cpp, line 501
terminate called after throwing an instance of ‘cv::Exception’

这个错误提示的意思就是cvShowImage这个函数没有被实现。
查看了opencv-2.4.13.2\modules\highgui\src\window.cpp源码，才明白这个文件只是没有函数实现的虚代码。windows下的真正实现代码是同文件夹下的windows_w32.cpp。应该是编译开关问题造成没有编译windows_w32.cpp。
于是在opencv-2.4.13.2\modules\highgui\CMakeLists.txt中找到如下代码 ，可以看到HAVE_WIN32UI用于控制是否编译windows_w32.cpp：

elseif(HAVE_WIN32UI) list(APPEND highgui_srcs src/window_w32.cpp) elseif(HAVE_GTK) list(APPEND highgui_srcs src/window_gtk.cpp) elseif(HAVE_CARBON) list(APPEND highgui_srcs src/window_carbon.cpp) list(APPEND HIGHGUI_LIBRARIES "-framework Carbon" "-framework QuickTime") elseif(HAVE_COCOA) list(APPEND highgui_srcs src/window_cocoa.mm) list(APPEND HIGHGUI_LIBRARIES "-framework Cocoa") endif()

进一步在opencv-2.4.13.2\CMakeLists.txt下找到了控制HAVE_WIN32UI的开关选项WITH_WIN32UI，如下：

else() if(DEFINED WITH_QT) status(" QT:" NO) endif() if(DEFINED WITH_WIN32UI) status(" Win32 UI:" HAVE_WIN32UI THEN YES ELSE NO) else() if(APPLE) if(WITH_CARBON) status(" Carbon:" YES) else() status(" Cocoa:" YES) endif() else() status(" GTK+ 2.x:" HAVE_GTK THEN "YES (ver ${ALIASOF_gtk+-2.0_VERSION})" ELSE NO) status(" GThread :" HAVE_GTHREAD THEN "YES (ver ${ALIASOF_gthread-2.0_VERSION})" ELSE NO) status(" GtkGlExt:" HAVE_GTKGLEXT THEN "YES (ver ${ALIASOF_gtkglext-1.0_VERSION})" ELSE NO) endif() endif() endif()

至此找到原因：编译opencv的时候设置了WITH_WIN32UI=off导致cmake没有编译windows_w32.cpp最终导致运行时调用cvShowImage出错。
解决办法也很简单，在cmake生成Makefile的命令行参数中添加-DWITH_WIN32UI=on指定编译加入UI函数支持。
以下是我编译opencv的完整命令行参数（注意最后一行）:

cmake .. -G "MinGW Makefiles" \
    -DCMAKE_BUILD_TYPE:STRING=release \     -DCMAKE_C_FLAGS="-m64 " \     -DCMAKE_CXX_FLAGS="-m64 " \     -DCMAKE_EXE_LINKER_FLAGS="-static -static-libstdc++ -static-libgcc " \     -DCMAKE_INSTALL_PREFIX="D:\caffe-static\release\opencv_windows_gcc520_x86_64" \     -DBUILD_DOCS=off \     -DBUILD_SHARED_LIBS=off \     -DBUILD_PACKAGE=on \     -DBUILD_PERF_TESTS=off \     -DBUILD_FAT_JAVA_LIB=off \     -DBUILD_TESTS=off \     -DBUILD_TIFF=on \     -DBUILD_JASPER=on \     -DBUILD_JPEG=on \     -DBUILD_OPENEXR=on \     -DBUILD_PNG=on \     -DBUILD_ZLIB=on \     -DBUILD_opencv_apps=off \     -DBUILD_opencv_calib3d=off \     -DBUILD_opencv_contrib=off \     -DBUILD_opencv_features2d=off \     -DBUILD_opencv_flann=off \     -DBUILD_opencv_gpu=off \     -DBUILD_opencv_java=off \     -DBUILD_opencv_legacy=off \     -DBUILD_opencv_ml=off \     -DBUILD_opencv_nonfree=off \     -DBUILD_opencv_objdetect=off \     -DBUILD_opencv_ocl=off \     -DBUILD_opencv_photo=off \     -DBUILD_opencv_python=off \     -DBUILD_opencv_stitching=off \     -DBUILD_opencv_superres=off \     -DBUILD_opencv_ts=off \     -DBUILD_opencv_video=off \     -DBUILD_opencv_videostab=off \     -DBUILD_opencv_world=off \     -DBUILD_opencv_lengcy=off \     -DWITH_DSHOW=off \     -DWITH_JASPER=on \     -DWITH_JPEG=on \     -DWITH_1394=off \     -DWITH_OPENEXR=on \     -DWITH_PNG=on \     -DWITH_TIFF=on \     -DWITH_1394=off \     -DWITH_EIGEN=off \     -DWITH_FFMPEG=off \     -DWITH_GIGEAPI=off \     -DWITH_GSTREAMER_0_10=off \     -DWITH_PVAPI=off -DWITH_CUDA=off \     -DWITH_CUFFT=off \     -DWITH_OPENCL=off \     -DWITH_OPENCLAMDBLAS=off \     -DWITH_OPENCLAMDFFT=off \     -DWITH_QT=off \     -DWITH_VFW=off \     -DWITH_VTK=off \     -DWITH_XIMEA=off \     -DWITH_WIN32UI=on