Parse HTML code implementation principles in Objective-C

InObjective-CParsingHTMLThe principle of code implementation is what we will introduce in this article. There is not much content, mainly through code implementation and parsing.HTML. Let's take a look at the detailed implementation.

 
 

  
  
# Import "StringChuLi. h"
  
  
/*
  
  
Project role: link network parsing html
  
  
*/
  
  
 
  
  
@ Implementation StringChuLi
  
  
 
  
  
// Access the webpage source code
  
  
-(NSString *) urlString :( NSString *) value {
  
  
NSURL * url = [NSURL URLWithString: value];
  
  
NSData * data = [NSData dataWithContentsOfURL: url];
  
  
// Solve Chinese garbled characters and use GBK
  
  
NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding (kCFStringEncodingGB_18030_2000 );
  
  
NSString * retStr = [[NSString alloc] initWithData: data encoding: enc];
  
  
Return retStr;
  
  
}
  
  
/*
  
  
Purpose: intercept the string from value1 to value2
  
  
Str: string to be processed
  
  
Value1: matching string on the left
  
  
Value2: matching string on the right
  
  
*/
  
  
-(NSString *) str :( NSString *) str value1 :( NSString *) value1 value2 :( NSString *) value2 {
  
  
// I: subscript of the matched string in str on the left
  
  
Int I;
  
  
// J: subscript of the matching string in str1 on the right
  
  
Int j;
  
  
// This class can match strings through value1
  
  
Nsange range1 = [str rangeOfString: value1];
  
  
// Determine whether range1 matches a string
  
  
If (range1.length> 0 ){
  
  
// Convert it to NSString
  
  
NSString * result1 = NSStringFromRange (range1 );
  
  
I = [self indexByValue: result1];
  
  
// Cause: add the length of the matching string to obtain the correct subscript.
  
  
Ii = I + [value1 length];
  
  
}
  
  
// Delete the characters before the subscript through the subscript
  
  
NSString * str1 = [str substringFromIndex: I];
  
  
Nsange range2 = [str1 rangeOfString: value2];
  
  
If (range2.length> 0 ){
  
  
NSString * result2 = NSStringFromRange (range2 );
  
  
J = [self indexByValue: result2];
  
  
}
  
  
NSString * str2 = [str1 substringToIndex: j];
  
  
Return str2;
  
  
}
  
  
 
  
  
// Filter the subscript of the matching information obtained
  
  
-(Int) indexByValue :( NSString *) str {
  
  
// Use the NSMutableString class to append an object.
  
  
NSMutableString * value = [[NSMutableString alloc] initWithFormat: @ ""];
  
  
NSString * colum2 = @"";
  
  
Int j = 0;
  
  
// Traverse the lower mark Value
  
  
For (int I = 1; I <[str length]; I ++ ){
  
  
NSString * colum1 = [str substringFromIndex: I];
  
  
[Value appendString: colum2];
  
  
Colum2 = [colum1 substringToIndex: 1];
  
  
If ([colum2 isEqualToString: @ ","]) {
  
  
J = [value intValue];
  
  
Break;
  
  
}
  
  
}
  
  
[Value release];
  
  
Return j;
  
  
}
  
  
@ End
 
 

Summary: InObjective-CParsingHTMLI hope this article will help you with the introduction of code implementation principles!