iphone – NSPOSIXErrorDomain Code = 12“无法在3G网络中分配内存”

2019年8月3日 298次阅读

我正在尝试在我的iPhone应用程序中的FTP服务器上发送文件.

在WiFi和GSM：EDGE网络中,一切似乎都没问题,但在3G网络中出现错误(并不总是,但经常)：

Error Domain=NSPOSIXErrorDomain
Code=12 “The operation couldn’t be
completed. Cannot allocate memory”

在出现错误的代码下方：

- (void)stream:(NSStream*)aStream handleEvent:(NSStreamEvent)eventCode {

    switch( eventCode ) {
        case NSStreamEventHasSpaceAvailable: {
            if( _readDataOffset == _readDataLimit ) {
                NSInteger readDataLen = [_readStream read:[_readData mutableBytes] maxLength:kReadDataLength];
                NSLog(@"readDataLen is %d",readDataLen);
                if( -1 == readDataLen ) {
                    _error = [[_readStream streamError] retain];
                    _keepRunning = NO;
                } else if( 0 == readDataLen ) {
                    _keepRunning = NO;
                } else {
                    _readDataOffset = 0;
                    _readDataLimit = readDataLen;
                }
            }

            if( _readDataOffset != _readDataLimit ) {
                NSOutputStream* writeStream = (NSOutputStream*)aStream;

                uint8_t *buffer = (void *)[_readData bytes];

          // vvvv and here  the value of writtenDataLen is often -1 (but only on 3G network)
                NSInteger writtenDataLen = [writeStream write:&buffer[_readDataOffset] maxLength:_readDataLimit - _readDataOffset]; 


                if( writtenDataLen > 0 ) {
                    _readDataOffset += writtenDataLen;
                    _writtenDataLen += writtenDataLen;
                    [self ftpPutDidWriteInternal];
                } else if( -1 == writtenDataLen ) {
                    _error = [[writeStream streamError] retain];
                    _keepRunning = NO;
                }
            }

        } break;
        case NSStreamEventErrorOccurred: {
            _error = [aStream.streamError retain];
            _keepRunning = NO;
        } break;
    }    
}

重要的是,整个发送是在具有自己的NSAutoreleasePool的单独线程中完成的.
有没有人得到这个问题？有什么建议吗？我很感激.

更新：
我刚刚检查过流行的iPhone应用程序“FTP On The Go”在3G网络中发送文件时遇到了同样的问题(？)！没有处理错误,但传输停止.

更新2：
我无法相信,但这是真的：来自Apple的SimpleFTPSample也受到了影响.

最佳答案 这是 – 解决方案(或更确切地说是解决方法)：

你应该将writeStream的属性设置为false,以关闭默认的持久连接

CFWriteStreamSetProperty( (CFWriteStreamRef)writeStreamRef, kCFStreamPropertyFTPAttemptPersistentConnection, kCFBooleanFalse ) ;
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