isEqualToString 不返回 true

发布于 2024-11-07 11:51:53 字数 527 浏览 1 评论 0原文

即使您在运行程序时键入“stop”，“Stopping”语句也永远不会被打印。 initWithUTF8String: 方法是否引入了额外的格式？

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    char holderText[256];

    fgets(holderText, 256, stdin);
    NSString *words = [[NSString alloc] initWithUTF8String:holderText];


    if ([words isEqualToString:@"stop"]) {

        NSLog(@"STOPPING");

    }
    NSLog(@"This is what you typed: %@", words);

    [pool drain];
    return 0;
}

原文

The "Stopping" statement never gets printed even if you type 'stop' when running the program. Is the initWithUTF8String: method introducing extra formatting?

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    char holderText[256];

    fgets(holderText, 256, stdin);
    NSString *words = [[NSString alloc] initWithUTF8String:holderText];


    if ([words isEqualToString:@"stop"]) {

        NSLog(@"STOPPING");

    }
    NSLog(@"This is what you typed: %@", words);

    [pool drain];
    return 0;
}

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落花随流水 2024-11-14 11:51:53

fgets 将在它提供给您的字符串中包含尾随换行符（除非它不适合缓冲区，但这里不是这样），所以它将是 "stop\ n" 而不是 "stop"。

将日志行更改为：

NSLog(@"This is what you typed: [%@]", words);

希望能够清楚地表明发生了什么。

修改比较以考虑到这一点，或者在比较之前删除换行符。

fgets will include the trailing newline in the string it gives you (except in the case where it wouldn't fit in the buffer but that's not so here), so it will be "stop\n" rather than "stop".

Changing the log line to:

NSLog(@"This is what you typed: [%@]", words);

should hopefully make it clear what's happening.

Either modify the comparison to take this into account, or trim the newline off before comparing.

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背叛残局 2024-11-14 11:51:53

由于 fgets 可能会包含尾随换行符，因此您可能需要使用 stringByTrimmingCharactersInSet: 修剪字符串中的所有换行符：

NSString *trimmed = [words stringByTrimmingCharactersInSet:[NSCharacterSet newlineCharacterSet]];

if([trimmed isEqualToString:@"stop"]]) {
  //...
}

Since fgets will probably include a trailing newline, you might want to do a trim of all newlines in the string by using stringByTrimmingCharactersInSet::

NSString *trimmed = [words stringByTrimmingCharactersInSet:[NSCharacterSet newlineCharacterSet]];

if([trimmed isEqualToString:@"stop"]]) {
  //...
}

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ι不睡觉的鱼゛ 2024-11-14 11:51:53

即使您泄漏了 words 字符串，代码看起来也很好。您需要在该分配调用的末尾添加一个[autorelease]。

您可以尝试 initWithCString 并修剪新行和周围的空白。

NSString *words = [[[NSString alloc] initWithCString:holderText] autorelease];
words = [words stringByTrimmingCharactersInSet:[NSCharacterSet newlineCharacterSet]];

The code looks fine, even though you're leaking the words string. You need to add an [autorelease] on the end of that alloc call.

You could try initWithCString and also trim new lines and surrounding whitespace.

NSString *words = [[[NSString alloc] initWithCString:holderText] autorelease];
words = [words stringByTrimmingCharactersInSet:[NSCharacterSet newlineCharacterSet]];

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