OC NSFileHandle和NSFileManage补充,NSVlue和NSNumber

NSFileManager

文件管理(可执行文件与文件夹)

• 创建文件creatFileAtPath:(NSString*) contents:(NSData*) attributes:(NSDictonary)
• 创建文件夹[fileManager createDirectoryAtPath:(NSString *) withIntermediateDirectories:(BOOL) attributes:(NSDictionary) error:&(NSError*)]
• 复制文件[fileManager copyItemAtPath:(NSString *) toPath:(NSString *) error:&(NSError*)
• 删除文件[fileManager removeItemAtPath:(NSString *) error:&(NSError *)]

NSFileHandle

fileHandleForReading

API:

• readDataOfLength
• readDataToEndOfFile

fileHandleForWriting

API:

• seekToFileOffset
• writeData

读写完毕,一定要 [fileHandle floseFile]

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NSNumber 与NSValue

• 装箱

NSNumber 将标量变成OC对象

NSValue 将结构体变成OC对象 (CGPoint,CGRect....)

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NSString API

NSStringFromCGRect/CGPoint/XXX