將HEX NSString轉換為NSData我正在嘗試將十六進制轉換NSString為NSData（我正在使用下面附加的代碼）。以下是輸出：<00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000>這看起來與我完全無關。關于哪里出錯的任何想法/建議？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);
3 回答
素胚勾勒不出你
TA貢獻1827條經(jīng)驗 獲得超9個贊
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);
神不在的星期二
TA貢獻1963條經(jīng)驗 獲得超6個贊
這可能更有用，Apple已經(jīng)共享了NSData類別。
代碼是：
@implementation NSData (HexString)// Not efficent+(id)dataWithHexString:(NSString *)hex{
char buf[3];
buf[2] = '\0';
NSAssert(0 == [hex length] % 2, @"Hex strings should have an even number of digits (%@)", hex);
unsigned char *bytes = malloc([hex length]/2);
unsigned char *bp = bytes;
for (CFIndex i = 0; i < [hex length]; i += 2) {
buf[0] = [hex characterAtIndex:i];
buf[1] = [hex characterAtIndex:i+1];
char *b2 = NULL;
*bp++ = strtol(buf, &b2, 16);
NSAssert(b2 == buf + 2, @"String should be all hex digits: %@ (bad digit around %d)", hex, i);
}
return [NSData dataWithBytesNoCopy:bytes length:[hex length]/2 freeWhenDone:YES];}@end- 3 回答
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