用于获取URL的文件名的函数 [英] function to get the file name of an URL
问题描述
我有一些源代码来获取网址的文件名
I have some source code to get the file name of an url
例如:
< a href =http://www.google.com/a.pdf =noreferrer> http://www.google.com/a.pdf
我希望得到a.pdf
I hope to get a.pdf
因为我可以得到的加入2个NSStrings的方法是'appendString',它只用于在右边添加一个字符串所以我计划从字符串' http:// www。的右侧逐个检查每个字符。 google.com/a.pdf ',当它到达char'/'时,停止检查,返回字符串fdp.a,之后我将fdp.a更改为a.pdf
because the way to join 2 NSStrings I can get is 'appendString' which only for adding a string at right side, so I planned to check each char one by one from the right side of string 'http://www.google.com/a.pdf', when it reach at the char '/', stop the checking, return string fdp.a , after that I change fdp.a to a.pdf
源代码低于
-(NSMutableString *) getSubStringAfterH : originalString:(NSString *)s0
{
NSInteger i,l;
l=[s0 length];
NSMutableString *h=[[NSMutableString alloc] init];
NSMutableString *ttt=[[NSMutableString alloc] init ];
for(i=l-1;i>=0;i--) //check each char one by one from the right side of string 'http://www.google.com/a.pdf', when it reach at the char '/', stop
{
ttt=[s0 substringWithRange:NSMakeRange(i, 1)];
if([ttt isEqualToString:@"/"])
{
break;
}
else
{
[h appendString:ttt];
}
}
[ttt release];
NSMutableString *h1=[[[NSMutableString alloc] initWithFormat:@""] autorelease];
for (i=[h length]-1;i>=0;i--)
{
NSMutableString *t1=[[NSMutableString alloc] init ];
t1=[h substringWithRange:NSMakeRange(i, 1)];
[h1 appendString:t1];
[t1 release];
}
[h release];
return h1;
}
h1可以重新输出coorect字符串a.pdf,但如果它返回到调用它的代码,在一段时间之后系统报告
'双重免费
***在malloc_error_break中设置断点以调试'
h1 can reuturn the coorect string a.pdf, but if it returns to the codes where it was called, after a while system reports 'double free *** set a breakpoint in malloc_error_break to debug'
我检查了很长一段时间,如果我删除了代码
I checked a long time and foudn that if I removed the code
ttt = [s0 substringWithRange:NSMakeRange(i,1)];
ttt=[s0 substringWithRange:NSMakeRange(i, 1)];
一切都会好的(当然getSubStringAfterH无法返回我预期的正确结果。),没有报告错误。
everything will be Ok (of course getSubStringAfterH can not returns the corrent result I expected.), no error reported.
我尝试修复错误a几个小时,但仍然没有线索。
I try to fix the bug a few hours, but still no clue.
欢迎任何评论
谢谢
interdev
Thanks interdev
推荐答案
试试这个:
编辑:来自评论
NSString *url = @"http://www.google.com/a.pdf";
NSArray *parts = [url componentsSeparatedByString:@"/"];
NSString *filename = [parts lastObject];
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