如何解决如何格式化使用NSASCIIStringEncoding编码的字符串
在我的Objective-C项目中,我要从cloudKit中获取一个密钥,并希望在格式化之前先格式化它,并想知道格式化有什么问题,
[cloudKitDB performQuery:query inZoneWithID:nil completionHandler:^(NSArray<CKRecord *> * _Nullable results,NSError * _Nullable error) {
NSString *key = [[NSString alloc] initWithData:[results.firstObject objectForKey:@"keyvalue"] encoding:NSASCIIStringEncoding];
NSLog(@"First Key Output: %@",key);
NSLog(@"Second Key Output: %@",key);
NSString *formattedKey = [NSString stringWithFormat:@"%@%@",[key stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]],@"1234"];
NSLog(@"Formatted Key: %@",formattedKey);
这是我登录的
2020-08-15 21:08:14.704650+0700 myapp[2208:79554] First Key Output: ADEvXp2F2BFJ2E4Lm2dSnYvHENhkFrK8
2020-08-15 21:08:14.704828+0700 myapp[2208:79554] Second Key Output: ADEvXp2F2BFJ2E4Lm2dSnYvHENhkFrK8
2020-08-15 21:08:14.705456+0700 myapp[2208:79554] Formatted Key: ADEvXp2F2BFJ2E4Lm2dSnYvHENhkFrK8
尽管,我尝试修剪空白但还是没有运气!
谢谢
解决方法
这是一个奇怪的问题,但是我可以使用下面的代码来重现它。
基于此,我仍然怀疑字符串后面有一些有趣的东西,并提供了在代码中修复它的方法。
// Note C strlen will stop at the first 0
char * s = "3Lm9dGmeTf3Lm9dGmeTf3Lm9dGmeTfdd\0\0\0";
NSData * data = [NSData dataWithBytes:s length:strlen( s ) + 2];
NSString * key = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
NSString * keyFormatted = [NSString stringWithFormat:@"%@%@",key,@"1234"];
NSLog ( @"Key : %@",key );
NSLog ( @"Formatted key: %@",keyFormatted );
// Use strlen to get rid of funnies
NSData * dataFixed = [data subdataWithRange:NSMakeRange( 0,strlen( s ) )];
NSString * keyFixed = [[NSString alloc] initWithData:dataFixed encoding:NSASCIIStringEncoding];
NSString * keyForm2 = [NSString stringWithFormat:@"%@%@",keyFixed,@"1234"];
NSLog ( @"Fixed key : %@",keyFixed );
NSLog ( @"Formatted key: %@",keyForm2 );
// Use C isprint to trim ... crude but works
while ( key.length && ! isprint ( [key characterAtIndex:key.length - 1] ) )
{
key = [key substringToIndex:key.length - 1];
}
keyFormatted = [NSString stringWithFormat:@"%@%@",keyFormatted );
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