NSUrl POST 错误

Posted 2023-02-27

【中文标题】NSUrl POST 错误

【英文标题】：NSUrl POST Error

【发布时间】：2011-12-27 23:24:51

【问题描述】：

我有一个页面，它接收用户的邮政编码，将该数据发送到 php 页面，然后通过 JSON 检索数据。这个页面抛出一​​个错误，上面写着：

2011-12-27 15:17:49.919 BusinessManager[3595:20b] * 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“* -[NSConcreteData isFileURL]：发送了无法识别的选择器到实例 0x4751490'

代码是：

    - (id)initWithNibName:(NSString *)SearchZip bundle:(NSBundle *)nibBundleOrNil 
if (self = [super initWithNibName:SearchZip bundle:nibBundleOrNil]) 
    // Custom initialization

return self;



- (IBAction) searchzip: (id) sender

NSString *post =[NSString stringWithFormat:@"zipcode=%@",zipField.text];

NSString *hostStr =    @"https://www.mysite.com/searchzip.php?";
hostStr = [hostStr stringByAppendingString:post];
NSData *dataURL =  [NSData dataWithContentsOfURL: [ NSURL URLWithString: hostStr ]];

NSString *jsonData = [[NSString alloc] initWithContentsOfURL:dataURL];


self.zipArray = [jsonData JSONValue]; 

[jsonData release];

- (void)viewDidLoad 
[super viewDidLoad];





- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
return 1;



- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
return [zipArray count];



- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:  (NSIndexPath *)indexPath 
 NSDictionary *infoDictionary = [self.zipArray objectAtIndex:indexPath.row];
 static NSString *Prospects = @"agencyname";

 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:Prospects];
 if (cell == nil) 
 cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:Prospects]  autorelease];
 

 // setting the text
 cell.text = [infoDictionary objectForKey:@"agencyname"];   
 self.navigationItem.title = @"Zip Search";

 // Set up the cell
 return cell;

 

【参考方案1】：

您正在尝试将NSData 的实例传递给-initWithContentsOfURL: 以创建jsonData 的NSString 实例。

我正要对你的方法进行拉皮条。请注意，我已完全删除创建 NSData 对象并重命名变量以更清晰。

- (IBAction)searchzip:(id)sender

    NSString *post = [NSString stringWithFormat:@"zipcode=%@", zipField.text];
    NSString *hostString = @"https://www.mysite.com/searchzip.php?";

    // Append string and add percent escapes
    hostString = [[hostString stringByAppendingString:post] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSURL *hostURL = [NSURL URLWithString:hostString];
    NSString *jsonString = [[NSString alloc] initWithContentsOfURL:hostURL];
    self.zipArray = [jsonString JSONValue]; 
    [jsonString release];