如何在NSData中打包struct？

Question

可能重复:
通过GameKit发送和接收NSData

我有struct由int变量和2个浮点指针(数组)组成.我如何打包这个结构ib NSData,然后解压缩它？

Answer 1

您可以使用dataWithBytes方法打包结构pf NSData:

struct aStruct {
/* Implementation */
};

//Struct variable 
aStruct exampleStruct;

// pack the struct into an NSData Object
NSData *myData = [NSData dataWithBytes:&exampleStruct length:sizeof(exampleStruct)];

// get back the the struct from the object
[myData getBytes:&exampleStruct length:sizeof(exampleStruct)];