![libpng]( "libpng")
本文介绍了的libpng +的boost :: GIL：png_infopp_NULL未找到的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图编译我与升压文件时总是出现此错误:: GIL PNG IO支持：
（我运行Mac OS X Leopard和升压1.42，1.4的libpng）
/usr/local/include/boost/gil/extension/io/png_io_private.hpp：在成员函数'无效的boost ::吉尔::详细:: png_reader ::初始化（ ）：
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:155：错误：png_infopp_NULL在此范围未声明
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:160：错误：png_infopp_NULL在此范围未声明
/usr/local/include/boost/gil/extension/io/png_io_private.hpp：在析构函数的boost ::吉尔::详细:: png_reader ::〜png_reader（）：
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:174：错误：png_infopp_NULL在此范围未声明
/usr/local/include/boost/gil/extension/io/png_io_private.hpp：在成员函数'无效的boost ::吉尔::详细:: png_reader ::申请（常量查看＆安培;）：
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:186：错误：int_p_NULL在此范围未声明
/usr/local/include/boost/gil/extension/io/png_io_private.hpp：在成员函数'无效的boost ::吉尔::详细:: png_reader_color_convert＆LT; CC＆GT; ::申请（常量查看＆安培;）：
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:228：错误：int_p_NULL在此范围未声明
/usr/local/include/boost/gil/extension/io/png_io_private.hpp：在成员函数'无效的boost ::吉尔::详细:: png_writer ::的init（）：
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:317：错误：png_infopp_NULL在此范围未声明
解决方案
起初我用了libpng 1.4
。我切换到1.2版本，所有的问题就走开了。
I always get this error when trying to compile my file with Boost::GIL PNG IO support:
(I'm running Mac OS X Leopard and Boost 1.42, LibPNG 1.4)
/usr/local/include/boost/gil/extension/io/png_io_private.hpp: In member function 'void boost::gil::detail::png_reader::init()':
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:155: error: 'png_infopp_NULL' was not declared in this scope
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:160: error: 'png_infopp_NULL' was not declared in this scope
/usr/local/include/boost/gil/extension/io/png_io_private.hpp: In destructor 'boost::gil::detail::png_reader::~png_reader()':
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:174: error: 'png_infopp_NULL' was not declared in this scope
/usr/local/include/boost/gil/extension/io/png_io_private.hpp: In member function 'void boost::gil::detail::png_reader::apply(const View&)':
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:186: error: 'int_p_NULL' was not declared in this scope
/usr/local/include/boost/gil/extension/io/png_io_private.hpp: In member function 'void boost::gil::detail::png_reader_color_convert<CC>::apply(const View&)':
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:228: error: 'int_p_NULL' was not declared in this scope
/usr/local/include/boost/gil/extension/io/png_io_private.hpp: In member function 'void boost::gil::detail::png_writer::init()':
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:317: error: 'png_infopp_NULL' was not declared in this scope
解决方案
Initially I used libpng 1.4. I switched to version 1.2 and all the problems went away.
这篇关于的libpng +的boost :: GIL：png_infopp_NULL未找到的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！
10-20 08:26