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Implicit declaration of function 'CC_MD5' is invalid in C99

//导入这个就行了#import <CommonCrypto/CommonDigest.h>//没有导包的时候,提示如下:Implicit declaration of function CC_MD5 is invalid in C99CC_MD5( cStr, strlen(cStr),result);

 

Implicit declaration of function 'CC_MD5' is invalid in C99