[英]How does NSMutableData work?
I have one problem to work with NSMutableData
. 我在使用
NSMutableData
一个问题。
I defined one NSMutableData *receivedData
, and tried to copy several NSData*
data to the receivedData
. 我定义一个
NSMutableData *receivedData
,并试图复制几个NSData*
数据到receivedData
。 I just called [receivedData appendData:data]
, but appears the data is not copied: 我只是叫
[receivedData appendData:data]
,但似乎没有复制数据:
....
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
Thanks. 谢谢。
Check if receivedData == nil
. 检查是否
receivedData == nil
。 If so, then you might have forgotten to initialize it. 如果是这样,那么您可能忘记了对其进行初始化。 For example:
例如:
receivedData = [[NSMutableData alloc] init];
Then release it when you don't need it anymore: 然后在不再需要它时将其释放:
[receivedData release];
receivedData = nil;
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