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

（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
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2 回答 2

30

libpng 1.4 删除了png_infopp_NULL和的定义int_p_NULL。所以添加

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

在您的代码中包含 GIL 标头之前。

于 2010-04-02T15:52:54.570 回答
0

最初我使用 libpng 1.4。我切换到 1.2 版，所有问题都消失了。

于 2010-03-14T15:13:43.237 回答