错误:'='标记之前的预期表达式

Question

我在'='标记之前收到预期表达式的错误.

#define RMH_MAX_UNENCODED_LENGTH= (RMH_MESSAGE_MAX_SIZE - RMH_ENCODED_MSG_OVERHEAD); // RMH_MAX_UNENCODED_LENGTH =4064

#define RMH_MAX_ENCODED_LENGTH = (3*sizeof(RMH_MAX_UNENCODED_LENGTH) / 4);//RMH_MAX_ENCODED_LENGTH =4;

int k = RMH_MAX_UNENCODED_LENGTH; //Error:expected expression before '=' token
NSLog(@"f:%d",k);

Answer 1

你的语法错了.使用:

#define RMH_MAX_UNENCODED_LENGTH (RMH_MESSAGE_MAX_SIZE - RMH_ENCODED_MSG_OVERHEAD)

注意:不=,不;,没有评论.

defines是"简单"纯文本替换.