C 和 OC 字符串转换 NSString 和 char * 转换 const char* 与 char *

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {

char *s = "Hello";

//C - > OC

NSString * str1 = [[NSString alloc] initWithUTF8String:s];

//OC -> C

const char *p1 = [str1 UTF8String];

const char *p2 = [str1 cStringUsingEncoding:NSASCIIStringEncoding];

NSLog(@"%s %s",p1,p2);

// const  声明的字符串不允许改变

return 0;

}