我有一个文本文件,其中包含两行数字,我想要做的就是将每行转换为一个字符串,然后将其添加到数组(称为字段)。我试图找到EOF字符时出现问题。我可以从文件中读取没有问题:我将它的内容转换为NSString,然后传递给此方法。从文本文件创建子字符串
-(void)parseString:(NSString *)inputString{
NSLog(@"[parseString] *inputString: %@", inputString);
//the end of the previous line, this is also the start of the next lien
int endOfPreviousLine = 0;
//count of how many characters we've gone through
int charCount = 0;
//while we havent gone through every character
while(charCount <= [inputString length]){
NSLog(@"[parseString] while loop count %i", charCount);
//if its an end of line character or end of file
if([inputString characterAtIndex:charCount] == '\n' || [inputString characterAtIndex:charCount] == '\0'){
//add a substring into the array
[fields addObject:[inputString substringWithRange:NSMakeRange(endOfPreviousLine, charCount)]];
NSLog(@"[parseString] string added into array: %@", [inputString substringWithRange:NSMakeRange(endOfPreviousLine, charCount)]);
//set the endOfPreviousLine to the current char count, this is where the next string will start from
endOfPreviousLine = charCount+1;
}
charCount++;
}
NSLog(@"[parseString] exited while. endOfPrevious: %i, charCount: %i", endOfPreviousLine, charCount);
}
我的文本文件的内容是这样的:
123
456
我能得到的第一个字符串(123),没有问题。呼叫将是:
[fields addObject:[inputString substringWithRange:NSMakeRange(0, 3)]];
接下来,我拨打电话的第二个字符串:
[fields addObject:[inputString substringWithRange:NSMakeRange(4, 7)]];
但我得到一个错误,我想这是因为我的指标是出界。由于索引从0开始,因此没有索引7(我认为它应该是EOF字符),并且出现错误。
总结一切:当只有6个字符+ EOF字符时,我不知道如何处理索引7。
谢谢。