使用扩展属性。看setxattr() https://developer.apple.com/library/mac/#documentation/Darwin/Reference/Manpages/man2/setxattr.2.html.
以下是写入字符串的示例调用:
NSData* encodedString = [theString dataUsingEncoding:NSUTF8StringEncoding];
int rc = setxattr("/path/to/your/file", "com.yourcompany.yourapp.yourattributename", [encodedString bytes], [encodedString length], 0, 0);
if (rc)
/* handle error */;
读取字符串:
ssize_t len = getxattr("/path/to/your/file", "com.yourcompany.yourapp.yourattributename", NULL, 0, 0, 0);
if (len < 0)
/* handle error */;
NSMutableData* data = [NSMutableData dataWithLength:len];
len = getxattr("/path/to/your/file", "com.yourcompany.yourapp.yourattributename", [data mutableBytes], len, 0, 0);
NSString* string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
PS:在回答问题之前,你不需要设置悬赏吗?