NSString char *互相轉換

　　//NSString轉換char    NSString * str1= @"Test";    const char * c1 =[str1 UTF8String];    //char轉換NSString    const char * c2 ="test";    NSString *str2 = [NSString stringWithUTF8String:c2];

char轉換成16進位hex碼:

NSString* str1=@"01 00 20 00 01 10 30 31 32 33 34 35 36 37 38 FF FF FF FF FF FF FF";        const char *str2=[str1 UTF8String];    unsigned char source[22];    int i;    int v;    for (i=0;i<22;i++) {        sscanf(str2+i*3,"%2X",&v);        source[i]=(unsigned char)v;        printf("%d=%X\n",i,source[i]);    }