Question

我想将桌面pc服务器（用c ++编写的代码）发送到Android手机（显然是java）。我正在使用OpenCV来加载和发送图像。在c ++客户端上，我能够接收并显示图像，但是我无法在Android程序中执行此操作。

如何使用javacv从Android应用程序中的套接字读取图像？

以下是工作服务器代码（cv名称空间）的一部分：

newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
 if (newsockfd < 0)
      error("ERROR on accept");

 Mat image;
 image = imread(FILE_PATH, CV_LOAD_IMAGE_COLOR);
 if(! image.data ) {
     return -1;
 }
 image = (image.reshape(0,1));
 int  imgSize = image.total()*image.elemSize();
 // Sending data
 n = send(newsockfd, image.data, imgSize, 0);
 if (n < 0)
      error("ERROR writing to socket");

部分工作c ++客户端代码（cv名称空间）：

if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
    error("ERROR connecting");

Mat  image = Mat::zeros(height, width, CV_8UC3);
int  imgSize = image.total()*image.elemSize();
uchar sockData[imgSize];

for (int i = 0; i < imgSize; i += n) {
if ((n = recv(sockfd, sockData +i, imgSize  - i, 0)) == -1) {
     exit(1);
    }
}
int ptr=0;
for (int i = 0;  i < image.rows; i++) {
    for (int j = 0; j < image.cols; j++) {
        image.at<cv::Vec3b>(i,j) = cv::Vec3b(sockData[ptr+ 0],sockData[ptr+1],sockData[ptr+2]);
        ptr=ptr+3;
    }
}

在Android应用程序中，我尝试使用DataInputStream读取图像，但我无法将其转换为位图并在屏幕上显示。 LogCat显示--- SkImageDecoder::Factory returned null，即使连接成功且bytesRead值大于零且每个测试图像也不同。这是我的实施：

private class MyClientThread implements Runnable {

String dstAddress;
int dstPort;
private Socket socket;

MyClientThread() {
    dstAddress = "192.168.1.105";
    dstPort = 8072;         
}

@Override
public void run() {
    try {
        int bytesRead = 0;
        InetAddress serverAddr = InetAddress.getByName(dstAddress);
        socket = new Socket(serverAddr, dstPort);
        try {
            DataInputStream din = new DataInputStream(socket.getInputStream());             
            byte []imgData = new byte [1280*800];
            do{
                bytesRead = din.read(imgData, 0, imgData.length);
                if (bytesRead > -1) //this causes to send and receive the same amount of bytes
                    totalBytesRead = totalBytesRead + bytesRead;
            } while (bytesRead > -1);

            bitmapimage = BitmapFactory.decodeByteArray(imgData, 0, totalBytesRead);                
        } catch (Exception e) {
            Log.e("TCP", "S: Error", e);
        }
        finally {}
        Log.i(TAG, String.valueOf(totalBytesRead));
        socket.close();
        imgView.setImageBitmap(bitmapimage);
        imgView.invalidate();           
    } catch (UnknownHostException e1) {
        e1.printStackTrace();
    } catch (IOException e1) {
        e1.printStackTrace();
    }       
}

Logcat错误：

12-05 11:41:32.720: E/TCP(2496): S: Error
12-05 11:41:32.720: E/TCP(2496): java.lang.ArrayIndexOutOfBoundsException
12-05 11:41:32.720: E/TCP(2496):    at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:515)
12-05 11:41:32.720: E/TCP(2496):    at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:545)
12-05 11:41:32.720: E/TCP(2496):    at com.example.javacvimagereceiver.MainActivity$MyClientThread.run(MainActivity.java:139)
12-05 11:41:32.720: E/TCP(2496):    at java.lang.Thread.run(Thread.java:818)

第139行是：bitmapimage = BitmapFactory.decodeByteArray(imgData, 0, totalBytesRead);

使用javacv从套接字读取图像

0 个答案: