ios NSCharacterSet使用讲解

来源：互联网发布：linux管道实验编辑：程序博客网时间：2024/05/17 22:25
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.  
- (void)viewDidLoad  
{  
    [super viewDidLoad];  
      
    [self test];  
      
    // Reference output...  
    dumpCharacterSet( @"alphanumericCharacterSet" );  
    dumpCharacterSet( @"controlCharacterSet" );  
    dumpCharacterSet( @"decimalDigitCharacterSet" );  
    dumpCharacterSet( @"decomposableCharacterSet" );  
    dumpCharacterSet( @"illegalCharacterSet" );  
    dumpCharacterSet( @"letterCharacterSet" );  
    dumpCharacterSet( @"lowercaseLetterCharacterSet" );  
    dumpCharacterSet( @"nonBaseCharacterSet" );  
    dumpCharacterSet( @"punctuationCharacterSet" );  
    dumpCharacterSet( @"uppercaseLetterCharacterSet" );  
    dumpCharacterSet( @"whitespaceAndNewlineCharacterSet" );  
    dumpCharacterSet( @"whitespaceCharacterSet" );  
}  
  
- (void)test  
{  
    // Set up for reading testString  
    NSString *testString = @"Los Angeles;8.25;0.580561574;1,Tokyo;1.9;0.643872234;1;Honolulu,0;0;0;Toronto;7.9;5.3322;3;";  
    // Parse CSV with NSScanner  
    NSScanner *myScanner = [NSScanner scannerWithString:testString];  
      
    NSString    *location;  
    float        theRevenue;  
    float        thePercent;  
    int            theRank;  
      
    // Set up data delimiter using semicolon//分号  
      
    NSCharacterSet *CharacterSet;  
      
    //Returns a character set containing the characters in a given string.  
    CharacterSet = [NSCharacterSet characterSetWithCharactersInString:@";,"];  
      
    // Double check scanner string  
    NSLog (@"Scanner string\n");  
      
    //Returns the string with which the receiver was created or initialized.  
    NSLog (@"%@",[myScanner string]);  
      
    // scanner loop start  
    while ([myScanner isAtEnd] == NO) {  
          
        if ( [myScanner scanUpToCharactersFromSet:CharacterSet intoString:&location] ) {  
            NSLog (@"%@",location);  
        }          
          
        // Skipping the ; and ,delimiter  
        if([myScanner scanString:@";" intoString:NULL] || [myScanner scanString:@"," intoString:NULL])  
            ;  
        // Read Revenue data up to ; delimiter and skipping  
        //Scans for a float value, returning a found value by reference.  
        if([myScanner scanFloat:&theRevenue])  
            NSLog(@"%lf",theRevenue);  
        if([myScanner scanString:@";" intoString:NULL] || [myScanner scanString:@"," intoString:NULL])  
            ;  
          
        // Read Percentage data up to ; delimiter and skipping  
        if([myScanner scanFloat:&thePercent])  
            NSLog(@"%lf",thePercent);  
        if([myScanner scanString:@";" intoString:NULL] || [myScanner scanString:@"," intoString:NULL])  
            ;  
          
        // Read Ranking data up to ; delimiter and skipping  
        if([myScanner scanInt:&theRank])  
            NSLog(@"%i",theRank);  
        if([myScanner scanString:@";" intoString:NULL] || [myScanner scanString:@"," intoString:NULL])  
            ;  
    }      
  
      
      
}  
  
void dumpCharacterSet( NSString *name )  
{  
    unichar idx;  
    NSCharacterSet *cset = [NSCharacterSet performSelector: NSSelectorFromString(name)];  
      
    printf("Character set (0-127): %s\n7-Bit: ", [name UTF8String]);  
      
    for( idx = 0; idx < 256; idx++ )  
    {  
        if ( 128 == idx ) {  
            printf( "\n8-Bit: " );  
        }  
          
        //Returns a Boolean value that indicates whether a given character is in the receiver.  
        if ([cset characterIsMember: idx])  
        {  
            //判断字符c是否为可打印字符（含空格）  
            if ( isprint(idx) ) {  
                printf( "%c ", idx);  
            }  
            else {  
                printf( "%02x ", idx);  
            }  
        }  
    }  
    printf("\n\n");  
} Hope To Help You !

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