本文转载至 http://blog.csdn.net/remote_roamer/article/details/7105776

1. 抛出错误的代码
   
   [cpp] view plaincopy

   1. //如果返回的报文是错误信息，则抛出错误  
   2.    if([outParams count] <= 0)  
   3.    {  
   4.        [NSException raise:@"WebService error" format:@"%@", returnJson4SOAP];  
   5.    }  
2. 在调用中捕获错误代码
   
   [cpp] view plaincopy

   1. //从soap 信息中解析出CusotmerDetail 对象  
   2.     @try  
   3.     {  
   4.         customerDetail = [[[SoapRtnJsonParser alloc] init] parse2CustomerDtail:[returnSoapXML dataUsingEncoding:NSUTF8StringEncoding]];  
   5.     }@catch (NSException * e) {  
   6.         NSLog(@"Exception: %@", e);  
   7.         UIAlertView * alert =  
   8.         [[UIAlertView alloc]  
   9.          initWithTitle:@"错误"  
   10.          message: [[NSString alloc] initWithFormat:@"%@",e]  
   11.          delegate:self  
   12.          cancelButtonTitle:nil  
   13.          otherButtonTitles:@"OK", nil];   
   14.         [alert show];  
   15.         [alert release];  
   16.         return;  
   17.     }