NSURLConnection委託didReceiveData數據中的尾隨字符

我真的很難找出爲什麼我的Web服務調用充斥着垃圾數據。NSURLConnection委託didReceiveData數據中的尾隨字符

我有一個UITableViewController調用Web服務，也作爲NSURLConnectionDelegate。

下面是感興趣的委託方法，請注意NSLog語句。

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { 
    NSLog(@"data %@", [[NSString alloc] initWithUTF8String: [data bytes]]); 
    NSLog(@"before %@", [NSString stringWithUTF8String: self.rawData.bytes]); 
    [self.rawData appendData:data]; 
    NSLog(@"after %@", [NSString stringWithUTF8String: self.rawData.bytes]); 
}

這裏是一個多次嘗試後生成的日誌：

2009-07-10 09:04:20.339 SundialInvoice[91493:20b] data {"items": [], "request": 

"/inventory/delivered.json"} 
2009-07-10 09:04:20.339 SundialInvoice[91493:20b] before 
2009-07-10 09:04:20.340 SundialInvoice[91493:20b] after {"items": [], "request": "/inventory/delivered.json"} SundialInvoice] [PID 

2009-07-10 09:04:23.153 SundialInvoice[91493:20b] data {"items": [], "request": "/inventory/delivered.json"}l 4] [Mes 
2009-07-10 09:04:23.154 SundialInvoice[91493:20b] before 
2009-07-10 09:04:23.154 SundialInvoice[91493:20b] after {"items": [], "request": "/inventory/delivered.json"} SundialInvoice] [PID 

2009-07-10 09:04:27.913 SundialInvoice[91493:20b] data (null) 
2009-07-10 09:04:27.913 SundialInvoice[91493:20b] before 
2009-07-10 09:04:27.914 SundialInvoice[91493:20b] after {"items": [], "request": "/inventory/delivered.json"} SundialInvoice] [PID 

2009-07-10 09:04:30.486 SundialInvoice[91493:20b] data {"items": [], "request": "/inventory/delivered.json"}ice/1.0 CFN 
2009-07-10 09:04:30.487 SundialInvoice[91493:20b] before 
2009-07-10 09:04:30.487 SundialInvoice[91493:20b] after {"items": [], "request": "/inventory/delivered.json"} SundialInvoice] [PID

哪裏是哪裏來的尾隨垃圾數據？我已經多次使用curl運行web服務，垃圾不是來自它。

來源

2009-07-10 jsamsa

我認爲垃圾來自日誌記錄：你說

[NSString stringWithUTF8String:self.rawData.bytes]

在這裏，你想從這個C-字符串的NSString（=字節數組的零終止）。問題是bytes方法NSData不是返回的數據以0結尾，因爲它是一個普通的數組，而不是一個C字符串。因此，NSString初始化程序甚至可以抓取接收到的NSData結束後的字節，直至達到先前存儲在內存中的某個零字節。

來源

2009-07-10 15:15:54 zoul

嘗試以下操作：

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { 
    [rawData appendData:data]; 
} 

- (void)connectionDidFinishLoading:(NSURLConnection *)connection 
{ 
    NSLog(@"%@",rawData); 
}

而且你有什麼聲明RAWDATA爲???

來源

2009-07-10 15:02:59 zpesk

要從NSData創建NSString，你應該使用initWithData:encoding:，如下所示：

NSString *str = [[NSString alloc] initWithData:self.rawData 
             encoding:NSUTF8StringEncoding]; 
NSLog(@"Before: %@", str); 
[str release];

治療NSData字節C字符串可能會導致某些安全漏洞。

來源

2009-07-10 19:54:40 notnoop

NSURLConnection委託didReceiveData數據中的尾隨字符

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