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;

}