http header宏定义问题，解决方案

macro

//复杂的宏实现，效率确实比较高一些,但有点小瑕疵，需要继续分割“//”才能消除警告

#define _ToStr(x)	#x
#define __ToStr(x)	_ToStr(x)

#define HTTP_HEADER	http:/\/www.google.com/

#define WEBSITE_INDEX1	@__ToStr(HTTP_HEADER)"index1.html"
#define WEBSITE_INDEX2	@__ToStr(HTTP_HEADER)"index2.html"

//NSLog(@"%@", WEBSITE_INDEX1);
//NSLog(@"%@", WEBSITE_INDEX2);

macro2.h

//与其搞那么复杂的宏，不如来点简单好理解的，如果您硬要效率的话，我只能呵呵了。

#define URL(a)  [NSString stringWithFormat:@"%@%@", BASE_URL, a]

#define BASE_URL @"http://www.google.com/"

#define WEBSITE1 URL(@"index1.html")
#define WEBSITE2 URL(@"index2.html")