iOS开发 OC对象与C++对象转换

1.NSData 转 void *

NSData *sData;
const void *dataByte = sData.bytes;
NSUInteger sLength = sData.length;

2.void * 转 NSData

NSUInteger buffersize = 128;
void *buffer = malloc(buffersize);
NSData *data = [NSData dataWithBytesNoCopy:buffer length:buffersize];
或者：
NSData *data = [NSData dataWithBytes:buffer length:buffersize];