OpenCV Apple Mach-O链接器错误-体系结构x86_64的未定义符号

Question

I am trying to run an opencv project by xcode6.

Now, I want to use Xcode 6 as development environment. But I get an Apple Mach-O Linker error. I add opencv2.framework in project. But i can't build project. That is the error;

Ld /Users/algorist/Library/Developer/Xcode/DerivedData/OpenCVTest-gngmfszrvncpuqfhljuggdtereui/Build/Products/Debug-iphonesimulator/OpenCVTest.app/OpenCVTest normal x86_64
    cd /Users/algorist/Desktop/Projeler/OpenCvTest/platforms/ios
    export IPHONEOS_DEPLOYMENT_TARGET=6.0
    export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator8.3.sdk -L/Users/algorist/Library/Developer/Xcode/DerivedData/OpenCVTest-gngmfszrvncpuqfhljuggdtereui/Build/Products/Debug-iphonesimulator -F/Users/algorist/Library/Developer/Xcode/DerivedData/OpenCVTest-gngmfszrvncpuqfhljuggdtereui/Build/Products/Debug-iphonesimulator -FOpenCVTest/Plugins/com.algorist.ocr -filelist /Users/algorist/Library/Developer/Xcode/DerivedData/OpenCVTest-gngmfszrvncpuqfhljuggdtereui/Build/Intermediates/OpenCVTest.build/Debug-iphonesimulator/OpenCVTest.build/Objects-normal/x86_64/OpenCVTest.LinkFileList -Xlinker -objc_abi_version -Xlinker 2 -weak_framework CoreFoundation -weak_framework UIKit -weak_framework AVFoundation -weak_framework CoreMedia -weak-lSystem -ObjC -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=6.0 -framework AssetsLibrary /Users/algorist/Library/Developer/Xcode/DerivedData/OpenCVTest-gngmfszrvncpuqfhljuggdtereui/Build/Products/Debug-iphonesimulator/libCordova.a -framework CoreGraphics -framework MobileCoreServices -framework TesseractOCR -framework opencv2 -framework AVFoundation -framework QuartzCore -framework Accelerate -framework GLKit -lstdc++.6.0.9 -framework CoreImage -lc++ -Xlinker -dependency_info -Xlinker /Users/algorist/Library/Developer/Xcode/DerivedData/OpenCVTest-gngmfszrvncpuqfhljuggdtereui/Build/Intermediates/OpenCVTest.build/Debug-iphonesimulator/OpenCVTest.build/Objects-normal/x86_64/OpenCVTest_dependency_info.dat -o /Users/algorist/Library/Developer/Xcode/DerivedData/OpenCVTest-gngmfszrvncpuqfhljuggdtereui/Build/Products/Debug-iphonesimulator/OpenCVTest.app/OpenCVTest

Undefined symbols for architecture x86_64:
  "_CVBufferRelease", referenced from:
      -[CaptureDelegate captureOutput:didOutputSampleBuffer:fromConnection:] in opencv2(cap_avfoundation.o)
      -[CaptureDelegate updateImage] in opencv2(cap_avfoundation.o)
      CvCaptureFile::retrieveFramePixelBuffer() in opencv2(cap_avfoundation.o)
  "_CVBufferRetain", referenced from:
      -[CaptureDelegate captureOutput:didOutputSampleBuffer:fromConnection:] in opencv2(cap_avfoundation.o)
      -[CaptureDelegate updateImage] in opencv2(cap_avfoundation.o)
      CvCaptureFile::retrieveFramePixelBuffer() in opencv2(cap_avfoundation.o)
  "_CVPixelBufferCreate", referenced from:
      -[CvVideoCamera pixelBufferFromCGImage:] in opencv2(cap_ios_video_camera.o)
  "_CVPixelBufferCreateWithBytes", referenced from:
      CvVideoWriter_AVFoundation::writeFrame(_IplImage const*) in opencv2(cap_avfoundation.o)
  "_CVPixelBufferGetBaseAddress", referenced from:
      -[CaptureDelegate updateImage] in opencv2(cap_avfoundation.o)
      CvCaptureFile::retrieveFramePixelBuffer() in opencv2(cap_avfoundation.o)
      -[CvVideoCamera pixelBufferFromCGImage:] in opencv2(cap_ios_video_camera.o)
      -[CvVideoCamera captureOutput:didOutputSampleBuffer:fromConnection:] in opencv2(cap_ios_video_camera.o)
  "_CVPixelBufferGetBaseAddressOfPlane", referenced from:
      -[CvVideoCamera captureOutput:didOutputSampleBuffer:fromConnection:] in opencv2(cap_ios_video_camera.o)
  "_CVPixelBufferGetBytesPerRow", referenced from:
      -[CaptureDelegate updateImage] in opencv2(cap_avfoundation.o)
      CvCaptureFile::retrieveFramePixelBuffer() in opencv2(cap_avfoundation.o)
      -[CvVideoCamera captureOutput:didOutputSampleBuffer:fromConnection:] in opencv2(cap_ios_video_camera.o)
  "_CVPixelBufferGetBytesPerRowOfPlane", referenced from:
      -[CvVideoCamera captureOutput:didOutputSampleBuffer:fromConnection:] in opencv2(cap_ios_video_camera.o)
  "_CVPixelBufferGetHeight", referenced from:
      -[CaptureDelegate updateImage] in opencv2(cap_avfoundation.o)
      CvCaptureFile::retrieveFramePixelBuffer() in opencv2(cap_avfoundation.o)
      -[CvVideoCamera captureOutput:didOutputSampleBuffer:fromConnection:] in opencv2(cap_ios_video_camera.o)
  "_CVPixelBufferGetHeightOfPlane", referenced from:
      -[CvVideoCamera captureOutput:didOutputSampleBuffer:fromConnection:] in opencv2(cap_ios_video_camera.o)
  "_CVPixelBufferGetPixelFormatType", referenced from:
      -[CvVideoCamera captureOutput:didOutputSampleBuffer:fromConnection:] in opencv2(cap_ios_video_camera.o)
  "_CVPixelBufferGetWidth", referenced from:
      -[CaptureDelegate updateImage] in opencv2(cap_avfoundation.o)
      CvCaptureFile::retrieveFramePixelBuffer() in opencv2(cap_avfoundation.o)
      -[CvVideoCamera captureOutput:didOutputSampleBuffer:fromConnection:] in opencv2(cap_ios_video_camera.o)
  "_CVPixelBufferGetWidthOfPlane", referenced from:
      -[CvVideoCamera captureOutput:didOutputSampleBuffer:fromConnection:] in opencv2(cap_ios_video_camera.o)
  "_CVPixelBufferLockBaseAddress", referenced from:
      -[CaptureDelegate updateImage] in opencv2(cap_avfoundation.o)
      CvCaptureFile::retrieveFramePixelBuffer() in opencv2(cap_avfoundation.o)
      -[CvVideoCamera pixelBufferFromCGImage:] in opencv2(cap_ios_video_camera.o)
      -[CvVideoCamera captureOutput:didOutputSampleBuffer:fromConnection:] in opencv2(cap_ios_video_camera.o)
  "_CVPixelBufferRelease", referenced from:
      CvVideoWriter_AVFoundation::writeFrame(_IplImage const*) in opencv2(cap_avfoundation.o)
  "_CVPixelBufferUnlockBaseAddress", referenced from:
      -[CaptureDelegate updateImage] in opencv2(cap_avfoundation.o)
      CvCaptureFile::retrieveFramePixelBuffer() in opencv2(cap_avfoundation.o)
      -[CvVideoCamera pixelBufferFromCGImage:] in opencv2(cap_ios_video_camera.o)
      -[CvVideoCamera captureOutput:didOutputSampleBuffer:fromConnection:] in opencv2(cap_ios_video_camera.o)
  "_kCVPixelBufferCGBitmapContextCompatibilityKey", referenced from:
      -[CvVideoCamera pixelBufferFromCGImage:] in opencv2(cap_ios_video_camera.o)
  "_kCVPixelBufferCGImageCompatibilityKey", referenced from:
      -[CvVideoCamera pixelBufferFromCGImage:] in opencv2(cap_ios_video_camera.o)
  "_kCVPixelBufferHeightKey", referenced from:
      CvCaptureCAM::startCaptureDevice(int) in opencv2(cap_avfoundation.o)
      CvCaptureCAM::setWidthHeight() in opencv2(cap_avfoundation.o)
  "_kCVPixelBufferPixelFormatTypeKey", referenced from:
      CvCaptureCAM::startCaptureDevice(int) in opencv2(cap_avfoundation.o)
      CvCaptureCAM::setWidthHeight() in opencv2(cap_avfoundation.o)
      CvCaptureFile::CvCaptureFile(char const*) in opencv2(cap_avfoundation.o)
      -[CvVideoCamera createVideoDataOutput] in opencv2(cap_ios_video_camera.o)
      -[CvVideoCamera createVideoFileOutput] in opencv2(cap_ios_video_camera.o)
  "_kCVPixelBufferWidthKey", referenced from:
      CvCaptureCAM::startCaptureDevice(int) in opencv2(cap_avfoundation.o)
      CvCaptureCAM::setWidthHeight() in opencv2(cap_avfoundation.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Answer 1

In XCode:

• Go to project settings
• Go to Link Binary With Libraries
• Make sure that the following iOS Frameworks are added:
  1) AVFoundation.framework
  2) AssetsLibrary.framework
  3) CoreMedia.framework
  4) CoreVideo.framework

It's trying to use the openCV methods with the same name, so supply it with the right headers and you should be good to go.

Thanks to Erzekiel for the inspiration/help.