使用boost的mapped file(mapped_file_source & mapped_file_sink)

最新推荐文章于 2024-04-06 21:12:05 发布

原创最新推荐文章于 2024-04-06 21:12:05 发布 · 7.6k 阅读

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#mapped_file_source #mapped_file_params #mapped_file_sink

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本文提供了一个使用Boost库复制文件的C++示例代码，详细介绍了如何打开源文件、读取数据并将其写入目标文件。

<pre name="code" class="cpp">#include <boost/iostreams/device/mapped_file.hpp>
std::string src_path = "/Users/alex/Movies/m3u8_videos/dance.mp4";
std::string dst_path = "/Users/alex/Movies/m3u8_videos/dance-copy.mp4";
void copy_file()
{
	boost::iostreams::mapped_file_params  params_src;
	params_src.path = src_path;
	boost::iostreams::mapped_file_source  mf_src;
	mf_src.open(params_src);
	if(mf_src.is_open())
	{
		unsigned char* p_src = (unsigned char*)mf_src.data();
		size_t len_src = mf_src.size();
		
		boost::iostreams::mapped_file_params  params_dst;
		params_dst.path = dst_path;
		params_dst.new_file_size = len_src;
		boost::iostreams::mapped_file_sink  mf_dst;
		mf_dst.open(params_dst);
		if(mf_dst.is_open())
		{
			unsigned char* p_dst = (unsigned char*)mf_dst.data();
			for(size_t i = 0; i < len_src ; i++)
			{
				*(p_dst + i) = *(p_src + i);
			}
			mf_dst.close();
		}
		mf_src.close();
	}
}
int main()
{
	copy_file(); 
        return 0;
}