<FSFileReaderCallback>协议 参考

类 <FSFileReaderCallback> 继承关系图:

构造函数
(unsigned long long)	- getSize
	Get total size of the file. 更多...
(NSData *)	- readBlock:size:
	Read a data block from the file. 更多...

详细描述

This class represents a callback object to do file reading. All the pure virtual functions in this class are used as callback functions and should be implemented by user to do file reading in a customized way.

函数文档

getSize()

- (unsigned long long) getSize

required

Get total size of the file.

返回

File size, in bytes. Implementation can return 0 for any error.

readBlock:size:()

- (NSData *) readBlock: (unsigned long long)  offset size: (unsigned long long)  size

required

Read a data block from the file.

参数

[in]	offset	Byte offset from beginning of the file
[in]	size	Number of bytes for the block.

返回

A data block read from file.