oc数据类型的转换
1.NSString<->NSData
//NSString->NSData
NSString *s = [NSString new];
s = @"ssss";
NSData *d = [s dataUsingEncoding:NSUTF8StringEncoding];
NSLog(@"data:%s",d.bytes);//ssss
//NSData->NSString
NSString *str = [[NSString alloc] initWithData:d encoding:NSUTF8StringEncoding];
NSLog(@"str:%@",str);//ssss
2.NSString<->const char
//NSString-> const char
const char *c = [str UTF8String];
NSLog(@"c----%s",c);//ssss
//const char -> NSString
str = [[NSString alloc] initWithCString:c encoding:NSUTF8StringEncoding];
NSLog(@"%@",str);//ssss
3.NSData<->const char*
//NSData -> const char
const char *a = [data bytes];
NSLog(@"---%s",a);
//const char -> NSData
NSData *data1 = [[NSData alloc] initWithBytes:a length:10];
NSLog(@"%@",data1);
4.NSData<->Byte
//NSData->Byte
Byte *byte = (Byte *)[data1 bytes];
NSLog(@"byte----%s",byte);//ssss
//Byte->NSData
data1 = [[NSData alloc] initWithBytes:byte length:4];
NSLog(@"%@",data1);
oc数据类型的转换
原文：http://blog.csdn.net/summer493506332/article/details/45065589
