Question

我正在尝试使用Poco C ++库在Mac OS X 10.8.2上用C ++编写简单的http请求。我安装了Poco，从this tutorial复制粘贴http_request.cc代码，用'g ++ -o http_get http_get.cc -lPocoNet'运行它，但得到了：

Undefined symbols for architecture x86_64:
  "Poco::StreamCopier::copyStream(std::basic_istream<char, std::char_traits<char> >&, std::basic_ostream<char, std::char_traits<char> >&, unsigned long)", referenced from:
      _main in ccKuZb1g.o
  "Poco::URI::URI(char const*)", referenced from:
      _main in ccKuZb1g.o
  "Poco::URI::~URI()", referenced from:
      _main in ccKuZb1g.o
  "Poco::URI::getPathAndQuery() const", referenced from:
      _main in ccKuZb1g.o
  "Poco::URI::getPort() const", referenced from:
      _main in ccKuZb1g.o
  "Poco::Exception::displayText() const", referenced from:
      _main in ccKuZb1g.o
  "typeinfo for Poco::Exception", referenced from:
      GCC_except_table1 in ccKuZb1g.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status

这几个小时一直在努力。知道如何解决这个问题吗？提前谢谢！

Answer 1

Poco::URI，Poco::StreamCopier类位于PocoFoundation库中，因此您还需要链接到该库。

g++ -o http_get http_get.cc -lPocoNet -lPocoFoundation

Answer 2

您似乎没有为编译源时指定库和库使用的包含路径。您需要向g ++提供-I和-L指令，以便为库和库本身指定包含路径。

OSX 10.8.2上的Poco C ++库：体系结构x86_64的未定义符号

2 个答案: