macos – LibPNG Boost :: GIL：找不到png_infopp_NULL

发布时间：2020-12-16 06:48:45 所属栏目：百科来源：网络整理

导读：尝试使用Boost :: GIL PNG IO支持编译我的文件时,我总是遇到此错误： (我正在运行Mac OS X Leopard和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::ini

尝试使用Boost :: GIL PNG IO支持编译我的文件时,我总是遇到此错误：

(我正在运行Mac OS X Leopard和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

解决方法

libpng 1.4删除了png_infopp_NULL和int_p_NULL的定义.所以加

#define png_infopp_NULL (png_infopp)NULL
#define int_p_NULL (int*)NULL

在包含GIL标头之前的代码中.

（编辑：李大同）

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