我使用通用tcp客户端通过TCP接收字符串消息。 我希望收到特定消息后，例如＆＃34; XXX＆＃34;我的客户准备接收bmp图像。 我在C ++中的服务器发送消息但客户端没有收到图像...
经过一些建议......下面我修改了代码......
这是我的代码：
TCP客户端：
public class TCPClient {
private String serverMessage;
public static final String SERVERIP = "192.168.1.88"; //your computer IP
public static final int SERVERPORT = 80;
private OnMessageReceived mMessageListener = null;
private boolean mRun = false;
private PrintWriter out;
private BufferedReader input;
private DataInputStream dis;
/**
* Constructor of the class. OnMessagedReceived listens for the messages received from server
*/
public TCPClient(OnMessageReceived listener) {
mMessageListener = listener;
}
/**
* Sends the message entered by client to the serveraddress
* @param message text entered by client
*/
public void sendMessage(String message){
if (out != null && !out.checkError()) {
out.println(message);
out.flush();
}
}
public void stopClient(){
mRun = false;
if (out != null) {
out.flush();
out.close();
}
mMessageListener = null;
input = null;
input = null;
input = null;
serverMessage = null;
}
public void run() {
mRun = true;
try {
//here you must put your computer's IP address.
InetAddress serverAddr = InetAddress.getByName(SERVERIP);
Log.e("TCP Client", "C: Connecting...");
//create a socket to make the connection with the server
Socket socket = new Socket(serverAddr, SERVERPORT);
try {
//send the message to the server
out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);
Log.e("TCP Client", "C: Sent.");
Log.e("TCP Client", "C: Done.");
//receive the message which the server sends back
dis = new DataInputStream(socket.getInputStream());
// The buffer reader cannot can't wrap an InputStream directly. It wraps another Reader.
// So inputstreamreader is used.
input = new BufferedReader(new InputStreamReader(dis, "UTF-8"));
Log.d("MyApp","We are here");
//this.input = new DataInputStream(in);
//in this while the client listens for the messages sent by the server
while (mRun) {
Log.d("MyApp", "We are here 2");
serverMessage = input.readLine();
if (serverMessage != null && mMessageListener != null) {
//call the method messageReceived from MyActivity class
mMessageListener.messageReceived(serverMessage);
Log.d("RESPONSE FROM SERVER", "S: Received Message: '" + serverMessage + "'");
}
if ("XXX".equals(serverMessage)) {
Log.d("MyApp", "We are here 3");
serverMessage = null;
while (mRun) {
WriteSDCard writeSDCard = new WriteSDCard();
writeSDCard.writeToSDFile(serverMessage);
}
}
}
} finally {
socket.close();
}
Log.e("RESPONSE FROM SERVER", "S: Received Message: '" + serverMessage + "'");
} catch (Exception e) {
Log.e("TCP", "S: Error", e);
} finally {
//the socket must be closed. It is not possible to reconnect to this socket
// after it is closed, which means a new socket instance has to be created.
}
}
//Declare the interface. The method messageReceived(String message) will must be implemented in the MyActivity
//class at on asynckTask doInBackground
public interface OnMessageReceived {
public void messageReceived(String message);
}
}
public class WriteSDCard extends Activity {
private static final String TAG = "MEDIA";
private TextView tv;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//(not needed) setContentView(R.layout.main);
//(not needed) tv = (TextView) findViewById(R.id.TextView01);
checkExternalMedia();
String message =null;
}
/** Method to check whether external media available and writable. This is adapted from
http://developer.android.com/guide/topics/data/data-storage.html#filesExternal */
private void checkExternalMedia(){
boolean mExternalStorageAvailable = false;
boolean mExternalStorageWriteable = false;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
// Can read and write the media
mExternalStorageAvailable = mExternalStorageWriteable = true;
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
// Can only read the media
mExternalStorageAvailable = true;
mExternalStorageWriteable = false;
} else {
// Can't read or write
mExternalStorageAvailable = mExternalStorageWriteable = false;
}
tv.append("\n\nExternal Media: readable="
+mExternalStorageAvailable+" writable="+mExternalStorageWriteable);
}
/** Method to write ascii text characters to file on SD card. Note that you must add a
WRITE_EXTERNAL_STORAGE permission to the manifest file or this method will throw
a FileNotFound Exception because you won't have write permission. */
void writeToSDFile(String inputMsg){
// Find the root of the external storage.
// See http://developer.android.com/guide/topics/data/data- storage.html#filesExternal
File root = android.os.Environment.getExternalStorageDirectory();
tv.append("\nExternal file system root: "+root);
// See http://stackoverflow.com/questions/3551821/android-write-to-sd-card-folder
File dir = new File (root.getAbsolutePath() + "/download");
dir.mkdirs();
Log.d("WriteSDCard", "Start writing");
File file = new File(dir, "myData.txt");
try {
FileOutputStream f = new FileOutputStream(file);
PrintWriter pw = new PrintWriter(f);
pw.println(inputMsg);
pw.flush();
pw.close();
f.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
Log.i(TAG, "******* File not found. Did you" +
" add a WRITE_EXTERNAL_STORAGE permission to the manifest?");
} catch (IOException e) {
e.printStackTrace();
}
tv.append("\n\nFile written to "+file);
}
/** Method to read in a text file placed in the res/raw directory of the application. The
method reads in all lines of the file sequentially. */
}
服务器端：
代码：
void sendBMP( int cs, int xs, int ys)
{
int imgdataoffset = 14 + 40; // file header size + bitmap header size
int rowsz = ((xs) + 3) & -4; // size of one padded row of pixels
int imgdatasize = (((xs*3) + 3) & -4) * ys; // size of image data
int filesize = imgdataoffset + imgdatasize;
int i, y;
HTLM_bmp_H HTLM_bmp_h;
HTLM_bmp_h.bmfh.bfSize = filesize;
HTLM_bmp_h.bmfh.bfReserved1 = 0;
HTLM_bmp_h.bmfh.bfReserved2 = 0;
HTLM_bmp_h.bmfh.bfOffBits = imgdataoffset;
HTLM_bmp_h.bmih.biSize = 40;
HTLM_bmp_h.bmih.biWidth = xs;
HTLM_bmp_h.bmih.biHeight = ys;
HTLM_bmp_h.bmih.biPlanes = 1;
HTLM_bmp_h.bmih.biBitCount = 24;
HTLM_bmp_h.bmih.biCompression = 0;
HTLM_bmp_h.bmih.biSizeImage = imgdatasize;
HTLM_bmp_h.bmih.biXPelsPerMeter = 1000;
HTLM_bmp_h.bmih.biYPelsPerMeter = 1000;
HTLM_bmp_h.bmih.biClrUsed = 1 << 24;
HTLM_bmp_h.bmih.biClrImportant = 0;
printf("Start Sending BMP.\n");
send(cs,(unsigned char *)"BM",2,0);
send(cs,(unsigned char *)&HTLM_bmp_h,sizeof(HTLM_bmp_h),0);
printf("Sending...\n");
Buff_ptr = 0;
send(cs, (unsigned char *)Rbuffer, BUFF_SIZE,0 );
send(cs, (unsigned char *)Gbuffer, BUFF_SIZE,0 );
send(cs, (unsigned char *)Bbuffer, BUFF_SIZE,0 );
send(cs, (unsigned char *)"\n",1,0);
send(cs, (unsigned char *)"END\n",4,0);
printf("Done\n\n");
}
typedef struct {
// char bfType1;
// char bfType2;
int bfSize;
short bfReserved1;
short bfReserved2;
int bfOffBits;
} BMFH;
typedef struct {
unsigned int biSize;
int biWidth;
int biHeight;
short biPlanes;
short biBitCount;
unsigned int biCompression;
unsigned int biSizeImage;
int biXPelsPerMeter;
int biYPelsPerMeter;
unsigned int biClrUsed;
unsigned int biClrImportant;
} BMIH;
typedef struct {
BMFH bmfh;
BMIH bmih;
} HTLM_bmp_H;
main()
{
TSK_Handle tsk_cam;
tsk_cam=TSK_create( (Fxn)TSK_webview, NULL);
TSK_setpri(tsk_cam, 8);
}
char buffer[2048];
Void TSK_webview()
{
int s,cs;
struct sockaddr_in addr; /* generic socket name */
struct sockaddr client_addr;
int sock_len = sizeof(struct sockaddr);
int frame = 0;
LgUns i=0;
int len;
int x = DSKeye_SXGA_WIDTH, y = DSKeye_SXGA_HEIGHT;
DSKeye_params CAM_params = {
....
};
lwIP_NetStart();
/**************************************************************
* Main loop.
***************************************************************/
s = socket( AF_INET, SOCK_STREAM, 0 );
addr.sin_port = htons(80);
addr.sin_addr.s_addr = 0;
memset(&(addr.sin_zero), 0, sizeof(addr.sin_zero));
printf("start\n");
if( bind(s, (struct sockaddr*)&addr, sizeof(struct sockaddr)))
{
printf("error binding to port\n");
return ;
}
printf("xx1\n");
if(DSKeye_open(&CAM_params)) {
printf("xx2\n");
SYS_abort("DSKcam_CAMopen");
printf("xx3\n"); fflush(stdout);}
printf("xx4\n");
while(1==1) {
printf("Waiting for client to be connected ... \n");
listen(s, 10);
cs = accept(s, &client_addr, &sock_len);
printf("Client connected.\n");
send(cs,(unsigned char *)"Server connected\n",17,0);
recv(cs, (unsigned char*)buffer, 17, 0);
switch (*(buffer)){
case 'A' :
...
case 'B' :
...
}
REG32(0xA0000080)=REG32(0xA0000080) - 0x800000; ///Disable stepper controller vhdl Quartus Block
for(frame = 0; frame < 4; frame++){ // Allow AEC etc to settle
SrcFrame=DSKeye_getFrame();
}
printf("Demosaicing of %d x %d image is ongoing \n", x, y);
demosaic(SrcFrame, x, y);
break;
}
printf("Demosaicing completed ...\n");
send(cs,(unsigned char *)"Demosaicing completed\n",22,0);
send(cs,(unsigned char *)"XXX\n",4,0);
sendBMP(cs, x, y);
fflush(stdout);
lwip_close(cs);
}
发送：lwip_send
int lwip_send(int s, void *data, int size, unsigned int flags)
{
struct lwip_socket *sock;
struct netbuf *buf;
err_t err;
LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_send(%d, data=%p, size=%d, flags=0x%x)\n", s, data, size, flags));
sock = get_socket(s);
if (!sock) {
set_errno(EBADF);
return -1;
}
switch (netconn_type(sock->conn)) {
case NETCONN_RAW:
case NETCONN_UDP:
case NETCONN_UDPLITE:
case NETCONN_UDPNOCHKSUM:
/* create a buffer */
buf = netbuf_new();
if (!buf) {
LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_send(%d) ENOBUFS\n", s));
sock_set_errno(sock, ENOBUFS);
return -1;
}
/* make the buffer point to the data that should
be sent */
netbuf_ref(buf, data, size);
/* send the data */
err = netconn_send(sock->conn, buf);
/* deallocated the buffer */
netbuf_delete(buf);
break;
case NETCONN_TCP:
err = netconn_write(sock->conn, data, size, NETCONN_COPY);
break;
default:
err = ERR_ARG;
break;
}
if (err != ERR_OK) {
LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_send(%d) err=%d\n", s, err));
sock_set_errno(sock, err_to_errno(err));
return -1;
}
LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_send(%d) ok size=%d\n", s, size));
sock_set_errno(sock, 0);
return size;
}
答案 0 :(得分：1)
您不能在同一个套接字上混用缓冲读卡器和数据输入流。缓冲读取器将预读并窃取您希望通过数据输入流读取的数据。您将不得不使用数据输入流来处理所有事情。相应地在发件人处。
答案 1 :(得分：0)
您对字符串相等性进行了错误的比较。
在Java中，使用String.equals(Object anObject)
您正在使用if (serverMessage == "XXX") {...。
您应该使用if ("XXX".equals(serverMessage)) {...。