How to use function "send" (Winsock) to stream video in VS10 with OpenCV? - networking

Question

I used OpenCV on VS10 to stream video from my webcam. I also used winsock2 to transmit a message and an image in the same computer from server-client TCP/IP (local host). Now I'm trying to stream video in real-timing. I don't know if with function "send" I can specify the length of each frame because I think that it can also send a constant char. Anyone know what function could I use to solve my problem?
Source code:
Server.cpp
#include "Server.h"
using namespace std;
//Our main function
//void main()
int _tmain(int argc, _TCHAR* argv[])
{
//We have to start de Winsock-dll
long answer;
WSAData wsaData;
WORD DLLVERSION;
DLLVERSION = MAKEWORD (2,1);
//Stard the dll
answer = WSAStartup(DLLVERSION, &wsaData);
//The dll was started, now I use the winsock funcitions in the program
//Structure for the sockets
SOCKADDR_IN addr;
//addr = our structure
int addrlen = sizeof(addr);
//Now we have to create our sockets
//sListen = socket which is listening for incoming connection
SOCKET sListen;
//sConnect = socket which is operating if a connection was found!
SOCKET sConnect;
//Now we have to setup our sockets:
//AF_INET = means that our socket belongs to the internet family
//SOCK_STREAM = means that our socket is a connection-orientated socket
sConnect = socket(AF_INET, SOCK_STREAM, NULL);
//Now we have to setup our structure
//inet_addr = IP of our socket (I use 127.0.0.1...this is the loopback adress)
addr.sin_addr.s_addr = inet_addr("127.0.0.1");
//Retype the family
addr.sin_family = AF_INET;
//Now we have to setup the port in the structure;
//Now our server has the IP: 127.0.0.1 and the port 1234
addr.sin_port = htons (1234);
//Now we have to setup our sListen socket
sListen = socket(AF_INET, SOCK_STREAM, NULL);
//Now we blind the socket
//The socket becomes the structure addr
bind(sListen, (SOCKADDR*)&addr, sizeof(addr));
//We have to say that the socket is listening for an incoming connection
listen(sListen, SOMAXCONN);
//SOMAXCON means that the server is listenning without any limit
//We have to start the capture of the frames to send it
//Well first of all initialize the frames and the default camera
//Using OpenCV
CvCapture *capture = 0;
IplImage *frame = 0;
int key = 0;
capture = cvCaptureFromCAM(0);
//At last we have to say what the serve sould do if a connection was found!
//For this we create a endless loop:
for(;;)
{
cout << "Waiting for an incoming connection" <<endl;
//if a connection was found << "..." <<endl
if(sConnect = accept(sListen, (SOCKADDR*)&addr, &addrlen))
{
cout << "A connection was found" <<endl;
//Second part in reference to Youtube 2
//1r: The server should send a message with the funcion send();
//The number of the letters +1
//Ex: Number of the letters: 14+1=15
answer = send(sConnect, "Bonjour",8, NULL);
//*************************Third part of the project
//Sending an image captured from the cam
//always check
if ( !capture )
{
fprintf( stderr, "Cannot open initialize webcam!\n" );
return 1;
}
//create a window for the video
cvNamedWindow( "server", CV_WINDOW_AUTOSIZE );
while( key != 'q' )
{
//get a frame
frame = cvQueryFrame(capture);
//always check
if( !frame ) break;
//display current frame
cvShowImage( "server", frame );
//exit if user press 'q'
key = cvWaitKey(1);
}
char StartStream(IplImage *frame);
int streamSize(IplImage *frame);
if(frame!=0)
{
return sizeof(*frame->imageData);
}
char* buffer = new char[10000];
int len = 10000;
//int sent = 0;
for(int i=0; i<len; i+= answer)
{
answer = send(sConnect, buffer+i, len-i, 0);
}
}
//free memory
cvDestroyWindow( "server" );
cvReleaseCapture( &capture );
}
return 0;
}
Client.cpp
#include "Client.h"
using namespace std;
//void main()
int _tmain(int argc, _TCHAR* argv[])
{
string confirm;
char message[200];
string strmessage;
//IplImage *pImg;
//Start the functions of the Winsock-DLL
long answer;
WSAData wsaData;
WORD DLLVersion;
DLLVersion = MAKEWORD(2,1);
answer = WSAStartup(DLLVersion, &wsaData);
//Setup our Sockets and SOCKADDR_IN
SOCKADDR_IN addr;
//we will need addrlen later maybe!
int addrlen = sizeof(addr);
//Now setup our Socket
SOCKET sConnect;
sConnect = socket(AF_INET, SOCK_STREAM, NULL);
//IP of our server
addr.sin_addr.s_addr = inet_addr("127.0.0.1");
//Now we have to retype de family
addr.sin_family = AF_INET;
//Port of our server
addr.sin_port = htons(1234);
//Now we will ask the client if he wants to connect
cout << "Do you want to connect to your server? [Y/N]" <<endl;
cin >> confirm;
//If the user don't want to connect the client will close
if (confirm == "N")
{
exit(1);
}
else
{
if (confirm == "Y")
{
//function connect
connect(sConnect, (SOCKADDR*)&addr, sizeof(addr));
//Our client is working
//Now we program the client that he should recv a message from the server
//Our client should receive the message with the function recv();
//With new char "message"
answer = recv(sConnect, message, sizeof(message), NULL);
//The client should display the message
//With new string strmessage
strmessage = message;
cout << strmessage <<endl;
//the client also should display the image recived
char* buffer = new char[10000];
int len = 10000;
//int rec = 0;
int i=0;
for(int i=0; i<len; i+= answer)
{
while (answer = recv(sConnect, buffer+i, len-i, 0))
{
IplImage *frame = cvCreateImage(cvSize(640,480), 8, 3);
frame->imageData = (char *)buffer;
cvNamedWindow( "client", CV_WINDOW_AUTOSIZE );
cvShowImage( "client", frame );
}
return 0;
}
getchar();
}
}
getchar();
}
I receive the message and the confirmation of the connection in the server. And also it opens the webcam but the client doesn't receive anything.

Answer 1

You can try the cv_video_server and client.