Question

我几天来一直在处理这个问题，我无法弄清问题是什么。我试图通过套接字将声音文件从iOS发送到基于C＃的服务器。代码如下：

目标C：

NSData * data = [NSData dataWithContentsOfFile:uri];

int length = 0;
int totalLen = [data length];
uint8_t buffer[1024];
Byte * readBytes = (uint8_t *)[data bytes];

//Tell the server what this is
int headerInt = 2;
NSData *header = [NSData dataWithBytes:&headerInt length:sizeof(int)];
[outputStream write:[header bytes] maxLength:sizeof(int)];
//Fill up the rest of the header (132 bytes total)
UTF8Char emptyHead[128];
[outputStream write:emptyHead maxLength:sizeof(char) * 128];

do
{
    int indexLen = (1024 > (totalLen - length) ? (totalLen- length) : 1024);
    memcpy(buffer, readBytes, indexLen);

    int written = [outputStream write: buffer maxLength: 1024];

    if (written < 0)
    {
        break;
    }

    length += written;


    readBytes += written;
}
while (length < [data length]);

[self sendENDS]; //Inform the server I am done

在C＃端读取数据（将尝试缩短代码），如下所示：

        if (read > 0)
        {
            //Write this into an overall buffer
            obj.bufferStream.Write(obj.buffer, 0, read);
            obj.bufferStream.Flush();

            if (obj.buffer.Length > 4)
            {
                //Check if the client sent an "end of stream" flag
                byte[] checkBuff = obj.buffer.Skip(read - 4).Take(4).ToArray();
                string terminator = ASCIIEncoding.ASCII.GetString(checkBuff);
                if (terminator == "ENDS")
                {
                    obj.readMe = false;
                }
            }
            if (obj.readMe == true)
            {
                obj.buffer = new byte[ConnectionObject.bufferSize];//I keep forgetting to clear the buffer
                localSocket.BeginReceive(obj.buffer, 0, ConnectionObject.bufferSize, SocketFlags.None, new AsyncCallback(recieve), obj);
            }
        }
//...the rest takes care of taking the obj.streamBuffer and writing it into a file along with handling other types of requests

我遇到的问题是，我发送的是iPhone上记录的.caf文件。但是，当我尝试在服务器计算机上播放时，QuickTime告诉我该文件无法播放。此外，文件大小（以字节为单位）似乎比原始文件略短（约20kb）。有任何想法吗？我为抛出这么多代码而道歉。非常感谢任何帮助！

PS。连接正确打开，反过来发送数据完美无缺。

Answer 1

只有当空间可用时才需要写入流，而不是假设它始终准备就绪。实现委托方法：

[_ostream setDelegate:self];
[_ostream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[_ostream open];


- (void)stream:(NSStream*)aStream handleEvent:(NSStreamEvent)event
{
    switch (event)
    {
        ...
        case NSStreamEventHasSpaceAvailable:
        {
            NSInteger written = [_ostream write:buffer maxLength:1024];
            ...

            if (transferredDataLength == dataLength])
            {
                [_ostream close];
                [_ostream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
                _ostream = nil;
            }
        }
        ...
    }
}

您可能需要处理其他事件，例如NSStreamEventErrorOccurred，NSStreamEventEndEncountered等。

Answer 2

事实证明，虽然Davyd非常正确，但实际问题是缓冲区大小没有正确设置。我在bytes文件前面有一个空白，这导致了读取它的问题。下次对齐你的缓冲区/套接字：）

发送套接字在另一端损坏

2 个答案: