Objectivec 将 HEX NSString 转换为 NSData

发布于09月06日

我正在try 将十六进制NSString转换为NSData(我使用下面附带的代码).以下是输出:

<00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000>

这对我来说完全无关紧要.关于哪里出了问题有什么 idea /建议吗？

NSString *strData = @"72ff63cea198b3edba8f7e0c23acc345050187a0cde5a9872cbab091ab73e553";

NSLog(@"string Data length is %d",[strData length]);

NSMutableData *commandToSend= [[NSMutableData alloc] init];
unsigned char whole_byte;
char byte_chars[2];
int i;
for (i=0; i < [strData length]/2; i++) {

    byte_chars[0] = [strData characterAtIndex:i*2];
    byte_chars[1] = [strData characterAtIndex:i*2+1];
    whole_byte = strtol(byte_chars, NULL, [strData length]);
    [commandToSend appendBytes:&whole_byte length:1]; 
}
NSLog(@"%@", commandToSend);

推荐答案

NSString *command = @"72ff63cea198b3edba8f7e0c23acc345050187a0cde5a9872cbab091ab73e553";

command = [command stringByReplacingOccurrencesOfString:@" " withString:@""];
NSMutableData *commandToSend= [[NSMutableData alloc] init];
unsigned char whole_byte;
char byte_chars[3] = {'\0','\0','\0'};
int i;
for (i=0; i < [command length]/2; i++) {
    byte_chars[0] = [command characterAtIndex:i*2];
    byte_chars[1] = [command characterAtIndex:i*2+1];
    whole_byte = strtol(byte_chars, NULL, 16);
    [commandToSend appendBytes:&whole_byte length:1]; 
}
NSLog(@"%@", commandToSend);