objective-c - 包含Zxing到Xcode 4.3 + Obj-C时的 undefined symbol

将ZXingWidget包含到我以前的iOS项目中时遇到了一些问题。

这是我较早使用iOS的XCode4.3 + ARC开始的项目。对于此项目，我需要包括ZXing进行扫描。

我遵循了提供的自述文件。

将zxing复制到项目根目录，添加ZXingWidget.xcodeproj项目

在构建阶段添加链接libZXingWidget.a

添加了ZXingWidget来定位依赖项

标头搜索路径-递归$(SRCROOT)/ zxing-read-only / iphone / ZXingWidget / Classes

标头搜索路径-非递归$(SRCROOT)/ zxing-read-only / cpp / core / src

导入所有必需的iOS框架。

注意事项:

ZXing已在iPhone模拟器

上编译并正常运行

我收到有关未定义符号的约66个错误。 (下面的示例)

Zxing代码是从SVN获得的(我也尝试过zip下载，相同但有64个错误)

但是我无法直接从我的代码中导入任何文件
(#import无法正常工作)。

我也没有运气尝试过这个solution。

我还缺少其他可能性吗？

任何帮助表示赞赏!

我现在得到一些错误输出。

Undefined symbols for architecture i386:
"std::ios_base::Init::Init()", referenced from:
  ___cxx_global_var_init in libZXingWidget.a(Binarizer.o)
  ___cxx_global_var_init in libZXingWidget.a(BinaryBitmap.o)
  ___cxx_global_var_init in libZXingWidget.a(Array.o)
  ___cxx_global_var_init in libZXingWidget.a(BitArray.o)
  ___cxx_global_var_init in libZXingWidget.a(BitMatrix.o)
  ___cxx_global_var_init in libZXingWidget.a(BitSource.o)
  ___cxx_global_var_init in libZXingWidget.a(Counted.o)
  ...
"std::terminate()", referenced from:
  zxing::Binarizer::Binarizer(zxing::Ref<zxing::LuminanceSource>) in libZXingWidget.a(Binarizer.o)
  zxing::Binarizer::~Binarizer() in libZXingWidget.a(Binarizer.o)
  zxing::BinaryBitmap::BinaryBitmap(zxing::Ref<zxing::Binarizer>) in libZXingWidget.a(BinaryBitmap.o)
  zxing::BinaryBitmap::~BinaryBitmap() in libZXingWidget.a(BinaryBitmap.o)
  zxing::BinaryBitmap::getBlackRow(int, zxing::Ref<zxing::BitArray>) in libZXingWidget.a(BinaryBitmap.o)
  zxing::BinaryBitmap::getWidth() const in libZXingWidget.a(BinaryBitmap.o)
  zxing::BinaryBitmap::getHeight() const in libZXingWidget.a(BinaryBitmap.o)
  ...
"operator delete(void*)", referenced from:
  zxing::Binarizer::~Binarizer() in libZXingWidget.a(Binarizer.o)
  zxing::Counted::~Counted() in libZXingWidget.a(Binarizer.o)
  zxing::BinaryBitmap::~BinaryBitmap() in libZXingWidget.a(BinaryBitmap.o)
  zxing::BinaryBitmap::crop(int, int, int, int) in libZXingWidget.a(BinaryBitmap.o)
  zxing::BinaryBitmap::rotateCounterClockwise() in libZXingWidget.a(BinaryBitmap.o)
  zxing::Counted::~Counted() in libZXingWidget.a(BinaryBitmap.o)
  zxing::BitArray::~BitArray() in libZXingWidget.a(BitArray.o)
  ...
"___cxa_allocate_exception", referenced from:
  zxing::Counted::release() in libZXingWidget.a(Binarizer.o)
  zxing::Counted::release() in libZXingWidget.a(BinaryBitmap.o)
  zxing::BitArray::setRange(int, int) in libZXingWidget.a(BitArray.o)
  zxing::BitArray::isRange(unsigned long, unsigned long, bool) in libZXingWidget.a(BitArray.o)
  zxing::BitMatrix::setRegion(unsigned long, unsigned long, unsigned long, unsigned long) in libZXingWidget.a(BitMatrix.o)
  zxing::Counted::release() in libZXingWidget.a(BitMatrix.o)
  zxing::BitSource::readBits(int) in libZXingWidget.a(BitSource.o)
  ...

最佳答案

您需要将main.m重命名为main.mm。这将告诉Xcode链接到必需的C++库，而缺少这些库。

关于objective-c - 包含Zxing到Xcode 4.3 + Obj-C时的 undefined symbol ，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/11545341/