AVFoundation爲什麼不能鏈接到我的XCode 3.2.3 iPhone 4.0.1項目？

我參照http://developer.apple.com/iphone/library/qa/qa2010/qa1702.html來從iPhone攝像頭捕捉視頻。除了該頁面的代碼外，這是一個新的項目。我還將AVFoundation框架添加到項目中。這裏的鏈接錯誤，我得到：AVFoundation爲什麼不能鏈接到我的XCode 3.2.3 iPhone 4.0.1項目？

Build my project of project my project with configuration Debug 

CompileC "build/my project.build/Debug-iphoneos/my project.build/Objects-normal/armv6/MainViewController.o" /Users/mwilliamson/Projects/my_project/iphone/Classes/MainViewController.m normal armv6 objective-c com.apple.compilers.gcc.4_2 
cd /Users/mwilliamson/Projects/my_project/iphone 
setenv LANG en_US.US-ASCII 
setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/opt/local/bin:/usr/local/git/bin" 
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 -x objective-c -arch armv6 -fmessage-length=0 -pipe -std=c99 -Wno-trigraphs -fpascal-strings -O0 -Wreturn-type -Wunused-variable -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.0.sdk -fvisibility=hidden -gdwarf-2 -mthumb -miphoneos-version-min=4.0 -iquote "/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/my project-generated-files.hmap" "-I/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/my project-own-target-headers.hmap" "-I/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/my project-all-target-headers.hmap" -iquote "/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/my project-project-headers.hmap" -F/Users/mwilliamson/Projects/my_project/iphone/build/Debug-iphoneos -I/Users/mwilliamson/Projects/my_project/iphone/build/Debug-iphoneos/include -I/Users/mwilliamson/Projects/my_project/iphone/opencv_device/include "-I/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/DerivedSources/armv6" "-I/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/DerivedSources" -include /var/folders/kW/kW6u6B7SGyGYu+nNumtIa++++TI/-Caches-/com.apple.Xcode.501/SharedPrecompiledHeaders/my_project_Prefix-alujyqxskcuyuogdsynmjyrkxbhh/my_project_Prefix.pch -c /Users/mwilliamson/Projects/my_project/iphone/Classes/MainViewController.m -o "/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/Objects-normal/armv6/MainViewController.o" 

/Users/mwilliamson/Projects/my_project/iphone/Classes/MainViewController.m: In function '-[MainViewController captureOutput:didOutputSampleBuffer:fromConnection:]': 
/Users/mwilliamson/Projects/my_project/iphone/Classes/MainViewController.m:126: warning: 'MainViewController' may not respond to '-imageFromSampleBuffer:' 
/Users/mwilliamson/Projects/my_project/iphone/Classes/MainViewController.m:126: warning: (Messages without a matching method signature 
/Users/mwilliamson/Projects/my_project/iphone/Classes/MainViewController.m:126: warning: will be assumed to return 'id' and accept 
/Users/mwilliamson/Projects/my_project/iphone/Classes/MainViewController.m:126: warning: '...' as arguments.) 

Ld "build/my project.build/Debug-iphoneos/my project.build/Objects-normal/armv6/my project" normal armv6 
cd /Users/mwilliamson/Projects/my_project/iphone 
setenv IPHONEOS_DEPLOYMENT_TARGET 4.0 
setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/opt/local/bin:/usr/local/git/bin" 
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 -arch armv6 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.0.sdk -L/Users/mwilliamson/Projects/my_project/iphone/build/Debug-iphoneos -F/Users/mwilliamson/Projects/my_project/iphone/build/Debug-iphoneos -filelist "/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/Objects-normal/armv6/my project.LinkFileList" -dead_strip -lz -lstdc++ /Users/mwilliamson/Projects/my_project/iphone/opencv_device/lib/libcxcore.a /Users/mwilliamson/Projects/my_project/iphone/opencv_device/lib/libcv.a -miphoneos-version-min=4.0 -framework Foundation -framework UIKit -framework CoreGraphics -framework AVFoundation -o "/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/Objects-normal/armv6/my project" 

Undefined symbols: 
    "_CVPixelBufferGetBaseAddress", referenced from: 
     -[MainViewController imageFromSampleBuffer:] in MainViewController.o 
    "_CVPixelBufferUnlockBaseAddress", referenced from: 
     -[MainViewController imageFromSampleBuffer:] in MainViewController.o 
    "_CVPixelBufferLockBaseAddress", referenced from: 
     -[MainViewController imageFromSampleBuffer:] in MainViewController.o 
    "_CMSampleBufferGetImageBuffer", referenced from: 
     -[MainViewController imageFromSampleBuffer:] in MainViewController.o 
    "_CVPixelBufferGetHeight", referenced from: 
     -[MainViewController imageFromSampleBuffer:] in MainViewController.o 
    "_kCVPixelBufferPixelFormatTypeKey", referenced from: 
     _kCVPixelBufferPixelFormatTypeKey$non_lazy_ptr in MainViewController.o 
    (maybe you meant: _kCVPixelBufferPixelFormatTypeKey$non_lazy_ptr) 
    "_CVPixelBufferGetWidth", referenced from: 
     -[MainViewController imageFromSampleBuffer:] in MainViewController.o 
    "_CVPixelBufferGetBytesPerRow", referenced from: 
     -[MainViewController imageFromSampleBuffer:] in MainViewController.o 
    "_CMTimeMake", referenced from: 
     -[MainViewController setupCaptureSession] in MainViewController.o 
    "_CVPixelBufferGetDataSize", referenced from: 
     -[MainViewController imageFromSampleBuffer:] in MainViewController.o 
ld: symbol(s) not found 
collect2: ld returned 1 exit status 

CompileC "build/my project.build/Debug-iphoneos/my project.build/Objects-normal/armv7/MainViewController.o" /Users/mwilliamson/Projects/my_project/iphone/Classes/MainViewController.m normal armv7 objective-c com.apple.compilers.gcc.4_2 
cd /Users/mwilliamson/Projects/my_project/iphone 
setenv LANG en_US.US-ASCII 
setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/opt/local/bin:/usr/local/git/bin" 
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 -x objective-c -arch armv7 -fmessage-length=0 -pipe -std=c99 -Wno-trigraphs -fpascal-strings -O0 -Wreturn-type -Wunused-variable -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.0.sdk -fvisibility=hidden -gdwarf-2 -mthumb -miphoneos-version-min=4.0 -iquote "/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/my project-generated-files.hmap" "-I/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/my project-own-target-headers.hmap" "-I/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/my project-all-target-headers.hmap" -iquote "/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/my project-project-headers.hmap" -F/Users/mwilliamson/Projects/my_project/iphone/build/Debug-iphoneos -I/Users/mwilliamson/Projects/my_project/iphone/build/Debug-iphoneos/include -I/Users/mwilliamson/Projects/my_project/iphone/opencv_device/include "-I/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/DerivedSources/armv7" "-I/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/DerivedSources" -include /var/folders/kW/kW6u6B7SGyGYu+nNumtIa++++TI/-Caches-/com.apple.Xcode.501/SharedPrecompiledHeaders/my_project_Prefix-gtrotaxhqdjhgqbqbsnyeqjkaxdt/my_project_Prefix.pch -c /Users/mwilliamson/Projects/my_project/iphone/Classes/MainViewController.m -o "/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/Objects-normal/armv7/MainViewController.o" 

/Users/mwilliamson/Projects/my_project/iphone/Classes/MainViewController.m: In function '-[MainViewController captureOutput:didOutputSampleBuffer:fromConnection:]': 
/Users/mwilliamson/Projects/my_project/iphone/Classes/MainViewController.m:126: warning: 'MainViewController' may not respond to '-imageFromSampleBuffer:' 
/Users/mwilliamson/Projects/my_project/iphone/Classes/MainViewController.m:126: warning: (Messages without a matching method signature 
/Users/mwilliamson/Projects/my_project/iphone/Classes/MainViewController.m:126: warning: will be assumed to return 'id' and accept 
/Users/mwilliamson/Projects/my_project/iphone/Classes/MainViewController.m:126: warning: '...' as arguments.) 

Ld "build/my project.build/Debug-iphoneos/my project.build/Objects-normal/armv7/my project" normal armv7 
cd /Users/mwilliamson/Projects/my_project/iphone 
setenv IPHONEOS_DEPLOYMENT_TARGET 4.0 
setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/opt/local/bin:/usr/local/git/bin" 
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 -arch armv7 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.0.sdk -L/Users/mwilliamson/Projects/my_project/iphone/build/Debug-iphoneos -F/Users/mwilliamson/Projects/my_project/iphone/build/Debug-iphoneos -filelist "/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/Objects-normal/armv7/my project.LinkFileList" -dead_strip -lz -lstdc++ /Users/mwilliamson/Projects/my_project/iphone/opencv_device/lib/libcxcore.a /Users/mwilliamson/Projects/my_project/iphone/opencv_device/lib/libcv.a -miphoneos-version-min=4.0 -framework Foundation -framework UIKit -framework CoreGraphics -framework AVFoundation -o "/Users/mwilliamson/Projects/my_project/iphone/build/my project.build/Debug-iphoneos/my project.build/Objects-normal/armv7/my project" 

Undefined symbols: 
    "_CVPixelBufferGetBaseAddress", referenced from: 
     -[MainViewController imageFromSampleBuffer:] in MainViewController.o 
    "_CVPixelBufferUnlockBaseAddress", referenced from: 
     -[MainViewController imageFromSampleBuffer:] in MainViewController.o 
    "_CVPixelBufferLockBaseAddress", referenced from: 
     -[MainViewController imageFromSampleBuffer:] in MainViewController.o 
    "_CMSampleBufferGetImageBuffer", referenced from: 
     -[MainViewController imageFromSampleBuffer:] in MainViewController.o 
    "_CVPixelBufferGetHeight", referenced from: 
     -[MainViewController imageFromSampleBuffer:] in MainViewController.o 
    "_kCVPixelBufferPixelFormatTypeKey", referenced from: 
     _kCVPixelBufferPixelFormatTypeKey$non_lazy_ptr in MainViewController.o 
    (maybe you meant: _kCVPixelBufferPixelFormatTypeKey$non_lazy_ptr) 
    "_CVPixelBufferGetWidth", referenced from: 
     -[MainViewController imageFromSampleBuffer:] in MainViewController.o 
    "_CVPixelBufferGetBytesPerRow", referenced from: 
     -[MainViewController imageFromSampleBuffer:] in MainViewController.o 
    "_CMTimeMake", referenced from: 
     -[MainViewController setupCaptureSession] in MainViewController.o 
    "_CVPixelBufferGetDataSize", referenced from: 
     -[MainViewController imageFromSampleBuffer:] in MainViewController.o 
ld: symbol(s) not found 
collect2: ld returned 1 exit status

來源

2010-08-03 Matt Williamson