Undefined symbols for architecture armv7 when using ZXing library in Xcode 4.5

Question

What I am trying to do

Integrate Zxing, QR code reader framework, in my iPhone project. I checked out ZXing sdk from here. I ran the sample project coming with ZXi

Answer 1

I've followed all of the suggestions above, and while everything compiles fine, but still fail, the error message:

Undefined symbols for architecture armv7:
"_CVPixelBufferLockBaseAddress", referenced from:-[ZXingWidgetController captureOutput:didOutputSampleBuffer:fromConnection:] in libZXingWidget.a(ZXingWidgetController.o)
"_CVPixelBufferGetBytesPerRow", referenced from:-[ZXingWidgetController captureOutput:didOutputSampleBuffer:fromConnection:] in libZXingWidget.a(ZXingWidgetController.o)
"_CVPixelBufferGetWidth", referenced from:-[ZXingWidgetController captureOutput:didOutputSampleBuffer:fromConnection:] in libZXingWidget.a(ZXingWidgetController.o)
"_CVPixelBufferGetBaseAddress", referenced from:-[ZXingWidgetController captureOutput:didOutputSampleBuffer:fromConnection:] in libZXingWidget.a(ZXingWidgetController.o)
"_kCVPixelBufferPixelFormatTypeKey", referenced from:-[ZXingWidgetController initCapture] in libZXingWidget.a(ZXingWidgetController.o)
"_CVPixelBufferGetHeight", referenced from:-[ZXingWidgetController captureOutput:didOutputSampleBuffer:fromConnection:] in libZXingWidget.a(ZXingWidgetController.o)
"_CVPixelBufferUnlockBaseAddress", referenced from:-[ZXingWidgetController captureOutput:didOutputSampleBuffer:fromConnection:] in libZXingWidget.a(ZXingWidgetController.o)ld: symbol(s) not found for architecture armv7 clang: error: linker command failed with exit code 1 (use -v to see invocation)

so, you add CoreVideo.framework, the compile will be ok.