Android到C++；套接字连接在收到文件后关闭

我有以下问题： 我有一个Android应用程序，它将图片发送给C++服务器，它计算一些参数并将它们发送回客户端。但是，当文件被发送并且所有内容都被计算出来时，手机无法接收信息，我的日志显示“套接字已关闭”

但是如果我注释掉发送和接收图像的代码，客户端就能够从服务器接收消息。为什么在发送图像后不可能这样做

这是我的相关代码：

安卓：

String picturePath = "/sdcard/DCIM/Camera/IMG_0004.jpg";
            final File picture = new File(picturePath);
                        if (picture.exists()) {
                            try {
                                //reading file and sending to server
                                FileInputStream fis = new FileInputStream(picture);
                                Log.d(TAG, "trying to connect");
                                String st = "laber";
                                Socket s = new Socket("192.168.0.12", port);

                                tv = (TextView) findViewById(R.id.textDesc);
                                tv.setText(st);
                                OutputStream out = s.getOutputStream();
                                DataInputStream in = new DataInputStream (s.getInputStream());
                                byte[] buf = new byte[1024];
                                int read = 0;
                                int totBytes = 0;
                                while ((read = fis.read(buf)) != -1)
                                {
                                    totBytes = totBytes + read;
                                    out.write(buf, 0, read);
                                    Log.d(TAG, "Image - Read: " + read + " - Total " + totBytes + " bytes!");

                                }
                                out.flush();

                                out.close();
                                st = in.readLine();
                                fis.close();


                                Log.d(TAG, "Waiting" + " "+ st+ " " +st.compareTo("laber"));



                                tv.setText(st);


                                // Close connection
                                s.close();
                                Log.d(TAG, "connection closed " + st);
                                dataReceived=true;
                            } catch (UnknownHostException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            } catch (IOException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            }
                        }

C++

SOCKET TempSock=SOCKET\u错误；
while（TempSock==SOCKET\u错误）
{
std:：cout在连接完成时关闭输出流，而不是之前。关闭套接字的输入或输出流将关闭套接字和另一个流。关闭围绕另一个流的任何流或读卡器或写器将关闭该流。
在阅读完后尝试将
移出。Close（）
移到。（不记得这是否是一个可能的问题。）我也尝试过这样做，但是我的C++服务器不知道文件是什么时候被完全接收的，而且它没有继续使用其他函数。总之，这只是OutPuxSun，我认为插座仍然是打开的。或者我错了吗？你的套接字初始化在哪里C++？关于不知道你什么时候收到所有的问题。然而，您可能应该更改“协议”以添加一个不在流中的特殊终止符标记，或者在流添加总长度之前添加。那么，我是否正确地理解了这一点？问题实际上是关闭outputsteam，我必须用另一种方法确定文件的结尾？
SOCKET TempSock=SOCKET_ERROR;
while(TempSock==SOCKET_ERROR)
{
    std::cout<<"Waiting for incoming connections...\r\n";
    TempSock=accept(Socket,NULL,NULL);
}
Socket=TempSock;
int totalBytes = 0;
ofstream outFile;
char buf[1024] = "";
int received = 0;
if (outFile != NULL) 
{
    outFile.open("C:\\test\\ReceivedFiles\\test.jpg" , ofstream::binary);
    cout << "File opened!" << endl;
} else 
{
    cout << "Can't open file!" << endl;
}
//receiving file and writing to disk
while ((received = recv(Socket, buf, sizeof(buf), 0)) > 0) 
{
    cout << "R:" << received << " ";
    if (received > 0) 
    {
        totalBytes += received;
        if (outFile.is_open()) 
        {
            outFile.write(buf, received); 
            cout << " (Total: " << totalBytes << " B)" << endl;
        } else
        cout << "Error in recv() function, received bytes = " << received << endl;
    } else 
        cout << "R:" << received << " ";
}

std::cout<<"Client connected!\r\n\r\n";

initImageSearch();
readFiles();
keypointMatching();
searchBundleOut();
ransacMatrices();
getRotationOrientation();

//send message back to client
string message = doubleToString(viewingDirectionArray[0])+" "+doubleToString(viewingDirectionArray[1])+" "+doubleToString(viewingDirectionArray[2])+" "+doubleToString(positionArray[0])+" "+doubleToString(positionArray[1])+" "+doubleToString(positionArray[2])+" 0.5 0.5 0.5 baum";
const char *szMessage;
szMessage = "123 456 789 246 135 178 189";//message.c_str();


int msg = send(Socket,szMessage,strlen(szMessage),0);
std::cout<<msg<<endl;
// Shutdown socket
shutdown(Socket,SD_SEND);

// Close socket entirely
closesocket(Socket);

// Cleanup Winsock
WSACleanup();