[英]How does NSMutableData work?
我在使用NSMutableData
一個問題。
我定義一個NSMutableData *receivedData
,並試圖復制幾個NSData*
數據到receivedData
。 我只是叫[receivedData appendData:data]
,但似乎沒有復制數據:
....
NSLog(@"get data! Received %d bytes of data",[data length]);
// output is not zero, say 1231.
[receivedData appendData:data];
NSLog(@"after append! length is %d bytes of data",[receivedData length]);
// showing zero
謝謝。
檢查是否receivedData == nil
。 如果是這樣,那么您可能忘記了對其進行初始化。 例如:
receivedData = [[NSMutableData alloc] init];
然后在不再需要它時將其釋放:
[receivedData release];
receivedData = nil;
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