iPhone NSXML解析器的布尔值

问题描述

| 我正在通过从XML文件http://www.calvaryccm.com/ServiceTimes.asmx/IsServiceTime读取来确定事件是否正在直播。 它返回一个布尔结果，但是我无法弄清楚如何使用Objective-C访问它。这是我到目前为止所拥有的：

NSError * error = nil;
NSString * responseString = [NSString stringWithContentsOfURL:[NSURL URLWithString:@\"http://www.calvaryccm.com/ServiceTimes.asmx/IsServiceTime\"] encoding:NSUTF8StringEncoding error:&error];
NSLog(responseString);
if (error) {
    NSLog(@\"%@\",[error localizedDescription]);
}

if ([responseString isEqualToString:@\"true\"]) {
    // Handle active content.
    NSString *baseVideoUrl = @\"http://streaming5.calvaryccm.com:1935/live/iPhone/playlist.m3u8\";
    NSLog(@\" finalUrl is : %@\",baseVideoUrl);

    MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL URLWithString:baseVideoUrl]];

    if ([moviePlayer respondsToSelector:@selector(setFullscreen:animated:)]) {  
        // Use the 3.2 style API  
        moviePlayer.controlStyle = MPMovieControlStyleDefault;  
        moviePlayer.shouldAutoplay = YES;  
        [self.view addSubview:moviePlayer.view];  
        [moviePlayer setFullscreen:YES animated:YES];  
    }

} else {
    // Inform user that the content is unavailable
    UIAlertView *alert = [[UIAlertView alloc]
                          initWithTitle: @\"Live Service\"
                          message: @\"There is no service going on at this time\"
                          delegate: nil
                          cancelButtonTitle:@\"OK\"
                          otherButtonTitles:nil];
    [alert show];
    [alert release];
}

    

解决方法

        首先，您的NSLog语句应为：

NSLog(@\"%@\",responseString); 

这将正确注销响应字符串，然后您将返回该值（我刚刚尝试过）：

<?xml version=\"1.0\" encoding=\"utf-8\"?>
<boolean xmlns=\"http://tempuri.org/\">false</boolean>

您的响应字符串不等于true，因为它是完全限定的XML字符串表示形式。您需要搜索字符串，可以通过查找字符串是否包含文本“ true”或“ false \”来实现。

NSRange range = [responseString rangeOfString : @\"true\"];

if (range.location != NSNotFound) {
    //String contained true
}

或者，您可以使用轻量级的XML解决方案，例如GDataXMLNode