如何取消 Web 服务调用 - IOS

发布于 2024-11-25 11:12:24 字数 1006 浏览 1 评论 0原文

我的 iPhone 应用程序中有用户身份验证。用户登录的工作方式是应用程序将用户名/密码发送到 Web 服务以供用户检查。我现在遇到的问题是我不知道如何设置“超时”（30 秒）并停止从 Web 服务请求数据？

NSString *soapMsg = 
    [NSString stringWithFormat:
     @"<?xml version=\"1.0\" encoding=\"utf-8\"?>...", username, password
     ];

    NSURL *url = [NSURL URLWithString: @"http://...Service.asmx"];      

    NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url];    
    NSString *msgLength = [NSString stringWithFormat:@"%d", [soapMsg length]];

    [req addValue:@"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];   
    [req addValue:@"http://.../LoginUser" forHTTPHeaderField:@"SOAPAction"];    
    [req addValue:msgLength forHTTPHeaderField:@"Content-Length"];   
    [req setHTTPMethod:@"POST"];
    [req setHTTPBody: [soapMsg dataUsingEncoding:NSUTF8StringEncoding]];

    conn = [[NSURLConnection alloc] initWithRequest:req delegate:self];

    if (conn) 
    {
        webData = [[NSMutableData data] retain];
    }

原文

I have user authentication in my iPhone application. User login works in a way that application send username/password to web service for user check. The problem I have now is I don't know how to setup 'timeout' (30 seconds) and stop requesting data from web service?

NSString *soapMsg = 
    [NSString stringWithFormat:
     @"<?xml version=\"1.0\" encoding=\"utf-8\"?>...", username, password
     ];

    NSURL *url = [NSURL URLWithString: @"http://...Service.asmx"];      

    NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url];    
    NSString *msgLength = [NSString stringWithFormat:@"%d", [soapMsg length]];

    [req addValue:@"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];   
    [req addValue:@"http://.../LoginUser" forHTTPHeaderField:@"SOAPAction"];    
    [req addValue:msgLength forHTTPHeaderField:@"Content-Length"];   
    [req setHTTPMethod:@"POST"];
    [req setHTTPBody: [soapMsg dataUsingEncoding:NSUTF8StringEncoding]];

    conn = [[NSURLConnection alloc] initWithRequest:req delegate:self];

    if (conn) 
    {
        webData = [[NSMutableData data] retain];
    }

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唠甜嗑 2024-12-02 11:12:24

[req setTimeoutInterval:urInterval];

setTimeoutInterval:
设置接收器的超时间隔，以秒为单位。
- (void)setTimeoutInterval:(NSTimeInterval)timeoutInterval
参数
超时间隔
超时间隔，以秒为单位。如果在连接尝试期间
请求保持空闲状态的时间超过超时间隔，
请求被认为已超时。默认超时间隔
是 60 秒。

[req setTimeoutInterval:urInterval];

setTimeoutInterval:
Sets the receiver’s timeout interval, in seconds.
- (void)setTimeoutInterval:(NSTimeInterval)timeoutInterval
Parameters
timeoutInterval
The timeout interval, in seconds. If during a connection attempt
the request remains idle for longer than the timeout interval, the
request is considered to have timed out. The default timeout interval
is 60 seconds.

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盛夏尉蓝 2024-12-02 11:12:24

您可以使用 NSURLConnection 的取消方法

/*! 
    @method cancel
    @abstract Cancels an asynchronous load of a URL.
    @discussion Once this method is called, the asynchronous load is
    stopped, and the NSURLConnectionDelegate associated with the
    receiver will no longer receive any asynchronous callbacks for
    this NSURLConnection.
*/
- (void)cancel;

You can use the cancel method of the NSURLConnection

/*! 
    @method cancel
    @abstract Cancels an asynchronous load of a URL.
    @discussion Once this method is called, the asynchronous load is
    stopped, and the NSURLConnectionDelegate associated with the
    receiver will no longer receive any asynchronous callbacks for
    this NSURLConnection.
*/
- (void)cancel;

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