将unsigned char数组转换为NSData并返回 [英] Convert unsigned char array to NSData and back

问题描述

如何在目标c中将unsigned char数组转换为NSData？

How do you convert an unsigned char array to an NSData in objective c?

这是我想要做的，但它不起作用。
Buffer是我的unsigned char数组。

This is what I am trying to do, but it doesn't work. Buffer is my unsigned char array.

NSData *data = [NSData dataWithBytes:message length:length];

推荐答案

你可以使用这个NSData类方法

You can just use this NSData class method

+ (id)dataWithBytes:(const void *)bytes length:(NSUInteger)length

类似

NSUInteger size = // some size
unsigned char array[size];
NSData* data = [NSData dataWithBytes:(const void *)array length:sizeof(unsigned char)*size];

然后可以像这样获取数组（如果你知道它是正确的数据类型）

You can then get the array back like this (if you know that it is the right data type)

NSUInteger size = [data length] / sizeof(unsigned char);
unsigned char* array = (unsigned char*) [data bytes];

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