C++ (Cpp) service_ptr_t::ensure_seekable示例

void tag_processor_id3v2::g_remove_ex(tag_write_callback & p_callback,const service_ptr_t<file> & p_file,t_uint64 & p_size_removed,abort_callback & p_abort)
{
	p_file->ensure_seekable();

	t_filesize len;
	
	len = p_file->get_size(p_abort);

	if (len == filesize_invalid) throw exception_io_no_length();
	
	p_file->seek(0,p_abort);
	
	t_uint64 offset;
	g_multiskip(p_file,offset,p_abort);
	
	if (offset>0 && offset<len)
	{
		len-=offset;
		service_ptr_t<file> temp;
		if (p_callback.open_temp_file(temp,p_abort)) {
			file::g_transfer_object(p_file,temp,len,p_abort);
		} else {
			if (len > 16*1024*1024) filesystem::g_open_temp(temp,p_abort);
			else filesystem::g_open_tempmem(temp,p_abort);
			file::g_transfer_object(p_file,temp,len,p_abort);
			p_file->seek(0,p_abort);
			p_file->set_eof(p_abort);
			temp->seek(0,p_abort);
			file::g_transfer_object(temp,p_file,len,p_abort);
		}
	}
	p_size_removed = offset;
}

示例#2

显示文件

 void open(service_ptr_t<file> file, const char *path,
           t_input_open_reason reason, abort_callback &abort)
 {
     m_pfile = file;
     input_open_file_helper(m_pfile, path, reason, abort);
     m_pfile->ensure_seekable();
     m_demuxer = std::make_shared<CAFFile>(m_pfile, abort);
     m_decoder = IDecoder::create_decoder(m_demuxer, abort);
 }