Question

我努力编写一个IPad应用程序，它需要3张照片并将它们发送到.net soap Web服务。它正确发送照片，我可以在我的服务器中看到它们。但问题是，当我点击发送按钮时，按钮保持蓝色（点击效果），应用程序冻结。

我相信我在向webservice发送照片时遇到了问题。我也在做所有发布的东西。

请查看我的代码，告诉我我做错了什么。

- (IBAction)buttonClick:(id)sender {
recordResults = FALSE;

datax = UIImageJPEGRepresentation(u1,0.6);
resultx = [datax base64Encoding];

datax2 = UIImageJPEGRepresentation(u2,0.6);
resultx2 = [datax2 base64Encoding];

datax3 = UIImageJPEGRepresentation(u3,0.6);
resultx3 = [datax3 base64Encoding];


NSString *soapMessage = [NSString stringWithFormat:
                         @"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
                         "<soap:Envelope 
                            xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" 
                            xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" 
                            xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">\n"
                         "<soap:Body>\n"
                         "<SendData xmlns=\"http://tempuri.org/\">\n"
                         "<containerId>%@</containerId>"
                         "<date_>%@</date_>"
                         "<image1>%@</image1>"
                         "<image2>%@</image2>"
                         "<image3>%@</image3>"
                         "<question1>%@</question1>"
                         "<question2>%@</question2>"
                         "<question3>%@</question3>"
                         "<question4>%@</question4>"
                         "<question5>%@</question5>"
                         "<question6>%@</question6>"
                         "<notes>%@</notes>"
                         "<transDate>%@</transDate>"
                         "<userId>%@</userId>"
                         "<macId>%@</macId>"
                         "<sFileID>%@</sFileID>"                             
                         "</SendData>"
                         "</soap:Body>\n"
                         "</soap:Envelope>\n", @"33", @"2013-09-09", resultx ,
                              resultx2 ,resultx3 ,@"true" ,@"true", @"true", @"true" ,
                              @"true" , @"3", @"notes", @"2013-09-09", @"123",
                              @"mymacid", @"sfileid"];
NSLog(soapMessage);

_lbl_result.text = soapMessage;


NSURL *url = [NSURL URLWithString:@"http://192.168.1.57/service1.asmx"];
NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
NSString *msgLength = [NSString stringWithFormat:@"%d", [soapMessage length]];

[theRequest addValue: @"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
[theRequest addValue: @"http://tempuri.org/SendData" forHTTPHeaderField:@"SOAPAction"];
[theRequest addValue: msgLength forHTTPHeaderField:@"Content-Length"];
[theRequest setHTTPMethod:@"POST"];
[theRequest setHTTPBody: [soapMessage dataUsingEncoding:NSUTF8StringEncoding]];

NSURLConnection *theConnection = 
        [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];

if( theConnection )
{
    webData = [NSMutableData data];
}
else
{
    NSLog(@"theConnection is NULL");
}

//[nameInput resignFirstResponder];
}

  -(void)connection:(NSURLConnection *)connection 
 didReceiveResponse:(NSURLResponse *)response
  {
[webData setLength: 0];
   }
  -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
 {
[webData appendData:data];
  }
 -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
 {
NSLog(@"ERROR with theConenction");
[connection release];
[webData release];
 }
 -(void)connectionDidFinishLoading:(NSURLConnection *)connection
 {
NSLog(@"DONE. Received Bytes: %d", [webData length]);
NSString *theXML = [[NSString alloc] initWithBytes:[webData mutableBytes] 
                                            length:[webData length] 
                                          encoding:NSUTF8StringEncoding];
NSLog(theXML);
_lbl_result.text = theXML;

[theXML release];

[connection release];
[webData release];
   }

Answer 1

您需要在单独的线程上运行服务器调用。它冻结的原因是因为你在UI线程上运行它。尝试使用它。

   dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void){
        //Run server call
        dispatch_async(dispatch_get_main_queue(), ^(void){
            //Run UI Updates
        });
    });

Answer 2

您在主线程中创建请求，因此您的应用程序是免费的..您在后台线程中创建请求，因此为用户加载图标...用于加载图标请参阅https://github.com/jdg/MBProgressHUD

Answer 3

你正在主线程（UI线程）上执行网络代码，所以它会被锁定，因为除了面向UI的工作之外你还可以使用它。

我建议采用以下方法：

[NSURLConnection sendAsynchronousRequest: queue: completionHandler:]

它应该是同步调用的直接交换，块完成处理程序将为您提供状态

例如，使用以下内容删除NSURLConnection的所有委托回调

替换：

NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];

使用：

[NSURLConnection sendAsynchronousRequest:theRequest queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {  
    NSString *theXML = [[NSString alloc] initWithBytes:[data bytes] length:[[data bytes] length] encoding:NSUTF8StringEncoding];    
    NSLog(theXML);  
    _lbl_result.text = theXML;  
    [theXML release];    
}];

Answer 4

您将需要使用以下方法异步发送请求：sendAsynchronousRequest：queue：completionHandler：

查看http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSURLConnection_Class/Reference/Reference.html

Answer 5

我的问题是我在主线程中将图像发送到webservice。我通过@ user352891解决了上述问题。但是，它并没有完全解决我的问题。

从Ipad发送3张照片是一个大数据。不幸的是，我正在观察我发送给webservice的内容并在标签和日志中显示webservice对象。这就是它挂起的原因。它等待来自webservice的响应，这是巨大的。

我评论了所有日志并显示给标签。它工作了

objective-c发送到Web服务后冻结

5 个答案: