Linux（客户端）和Windows（服务端）下socket通信实例：

（1）首先是Windows做客户端，Linux做服务端的程序

Windows   Client端

1. #include <stdio.h>
2. #include <Windows.h>
3. #pragma comment(lib, "ws2_32.lib")
4. #define Port 5000
5. #define IP_ADDRESS "192.168.1.30"     //服务器地址
6. int main() // argc是命令行总的参数个数
7. {
8. WSADATA s; // 用来储存调用AfxSocketInit全局函数返回的Windows Sockets初始化信息
9. SOCKET ClientSocket;
10. struct sockaddr_in ClientAddr; // 一个sockaddr_in型的结构体对象
11. int ret = 0;
12. char SendBuffer[MAX_PATH]; // Windows的MAX_PATH默认是260
13. // 初始化Windows Socket
14. // WSAStartup函数对Winsock服务的初始化
15. if (WSAStartup(MAKEWORD(2, 2), &s) != 0) // 通过连接两个给定的无符号参数,首个参数为低字节
16. {
17. printf("Init Windows Socket Failed! Error: %d\n", GetLastError());
18. getchar();
19. return -1;
20. }
21. while (1)
22. {
23. // 创建一个套接口
24. // 如果这样一个套接口用connect()与一个指定端口连接
25. // 则可用send()和recv()与该端口进行数据报的发送与接收
26. // 当会话结束后，调用closesocket()
27. ClientSocket = socket(AF_INET, // 只支持ARPA Internet地址格式
28. SOCK_STREAM, // 新套接口的类型描述
29. IPPROTO_TCP); // 套接口所用的协议
30. if (ClientSocket == INVALID_SOCKET)
31. {
32. printf("Create Socket Failed! Error: %d\n", GetLastError());
33. getchar();
34. return -1;
35. }
36. ClientAddr.sin_family = AF_INET;
37. ClientAddr.sin_addr.s_addr = inet_addr(IP_ADDRESS); // 定义IP地址
38. ClientAddr.sin_port = htons(Port); // 将主机的无符号短整形数转换成网络字节顺序
39. memset(ClientAddr.sin_zero, 0X00, 8); // 函数通常为新申请的内存做初始化工作
40. // 连接Socket
41. ret = connect(ClientSocket,
42. (struct sockaddr*)&ClientAddr,
43. sizeof(ClientAddr));
44. if (ret == SOCKET_ERROR)
45. {
46. printf("Socket Connect Failed! Error:%d\n", GetLastError());
47. getchar();
48. return -1;
49. }
50. else
51. {
52. printf("Socket Connect Succeed!");
53. }
54. printf("Input Data: ");
55. while (1)
56. {
57. scanf("%s", &SendBuffer);
58. // 发送数据至服务器
59. ret = send(ClientSocket,
60. SendBuffer,
61. (int)strlen(SendBuffer), // 返回发送缓冲区数据长度
62. 0);
63. if (ret == SOCKET_ERROR)
64. {
65. printf("Send Information Failed! Error:%d\n", GetLastError());
66. getchar();
67. break;
68. }
69. break;
70. }
71. // 关闭socket
72. closesocket(ClientSocket);
73. if (SendBuffer[0] == 'q') // 设定输入第一个字符为q时退出
74. {
75. printf("Quit!\n");
76. break;
77. }
78. }
79. WSACleanup();
80. getchar();
81. system("pause");
82. return 0;
83. }

Linux server端

1. #include <stdio.h>
2. #include <sys/socket.h>
3. #include <sys/types.h> /* See NOTES */
4. #include <sys/socket.h>
5. #include <arpa/inet.h>
6. #include <string.h>
7. #include<unistd.h>
8. #include <cstdlib>
9. #define SERVER_PORT 5000
10. #define LENGTH_OF_LISTEN_QUEUE 20
11. #define BUFFER_SIZE 10
12. int main() // (int argc, char* argv[])
13. {
14. struct sockaddr_in server_addr;
15. int server_socket;
16. int opt = 1;
17. bzero(&server_addr, sizeof(server_addr)); // 置字节字符串前n个字节为0，包括'\0'
18. server_addr.sin_family = AF_INET;
19. server_addr.sin_addr.s_addr = htons(INADDR_ANY); // 转小端,INADDR_ANY就是指定地址为0.0.0.0的地址
20. server_addr.sin_port = htons(SERVER_PORT);
21. // 创建一个Socket
22. server_socket = socket(PF_INET, SOCK_STREAM, 0);
23. if (server_socket < 0)
24. {
25. printf("Create Socket Failed!\n");
26. exit(1);
27. }
28. // bind a socket
29. setsockopt(server_socket, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
30. if(bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))
31. {
32. printf("Server Bind Port: %d Failed!\n", SERVER_PORT);
33. exit(1);
34. }
35. // 监听Socket
36. if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))
37. {
38. printf("Server Listen Failed!\n");
39. exit(1);
40. }
41. while(1)
42. {
43. struct sockaddr_in client_addr;
44. int client_socket;
45. socklen_t length;
46. char Buffer[BUFFER_SIZE];
47. // 连接客户端Socket
48. length = sizeof(client_addr);
49. client_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);
50. if (client_socket < 0)
51. {
52. printf("Server Accept Failed!\n");
53. break;
54. }
55. // 从客户端接收数据
56. while(1)
57. {
58. bzero(Buffer, BUFFER_SIZE);
59. length = recv(client_socket, Buffer, BUFFER_SIZE, 0);
60. if (length < 0)
61. {
62. printf("Server Recieve Data Failed!\n");
63. break;
64. }
65. if ('q' == Buffer[0])
66. {
67. printf("Quit!\n");
68. break;
69. }
70. printf("%s\n", Buffer);
71. break;
72. }
73. close(client_socket);
74. }
75. close(server_socket);
76. return 0;
77. }

（2）Windows做服务端，Linux做客户端实例  传输视频

windows端：

#include <stdio.h>

#include <string>

#include <iostream>

#include <Winsock2.h>

#include <opencv2/opencv.hpp>

#include <vector>

#include "globalsetting.h"

#pragma comment(lib,"ws2_32.lib")

/**

 * OpenCV video streaming over TCP/IP

 * Client: Receives video from server and display it

 * Created by Wu yongcong 2017-8-24

 */

using namespace cv;

using namespace std;

int main()

{

    //--------------------------------------------------------

    //networking stuff: socket , connect

    //--------------------------------------------------------

    WSADATA wsaData;

    SOCKET sockClient;//客户端Socket

    SOCKADDR_IN addrServer;//服务端地址

    WSAStartup(MAKEWORD(2, 2), &wsaData);

    //新建客户端socket

    sockClient = socket(AF_INET, SOCK_STREAM, 0);

    //定义要连接的服务端地址

    addrServer.sin_addr.S_un.S_addr = inet_addr(SOCKET_IP); //服务端IP

    addrServer.sin_family = AF_INET;

    addrServer.sin_port = htons(SOCKET_PORT);//服务端连接端口

    //连接到服务端

    connect(sockClient, (SOCKADDR*)&addrServer, sizeof(SOCKADDR));

    //----------------------------------------------------------

    //OpenCV Code

    //----------------------------------------------------------

    Mat img;

    img = Mat::zeros(480 , 640, CV_8UC3);//CV_8UC3代表是三通道

    int imgSize = img.total() * img.elemSize();

    uchar *iptr = img.data;

    int bytes = 0;

    int key;

    //make img continuos

    if ( ! img.isContinuous() ) {

          img = img.clone();

    }

    std::cout << "Image Size:" << imgSize << std::endl;

    namedWindow("CV Video Client",1);

    while (key != 'q') {

        if ((bytes = recv(sockClient, (char *)iptr, imgSize , MSG_WAITALL)) == -1) {

            std::cerr << "recv failed, received bytes = " << bytes << std::endl;

        }

        cv::imshow("CV Video Client", img);

        if (key = cv::waitKey(10) >= 0) break;

    }

    closesocket(sockClient);

    WSACleanup();

    return 0;

}

linux端：编译命令：

g++ `pkg-config --cflags opencv` -o server -pthread socketServer.cpp `pkg-config --libs opencv`

1. #include "opencv2/opencv.hpp"
2. #include <iostream>
3. #include <sys/socket.h>
4. #include <arpa/inet.h>
5. #include <sys/ioctl.h>
6. #include <net/if.h>
7. #include <unistd.h>
8. #include <string.h>
9. #include <stdio.h>
10. #include <stdlib.h>
11. #include <pthread.h>
12. #include "socketSetting.h"
13. /*
14. * Created by Wu yongcong 2017-8-25
15. *
16. * socket transfer video server
17. *
18. */
19. using namespace cv;
20. using namespace std;
21. void *display(void *);
22. VideoCapture cap(CAMMER_PORT); // open the default camera
23. int main(int argc, char** argv)
24. {
25. //--------------------------------------------------------
26. //networking stuff: socket, bind, listen
27. //--------------------------------------------------------
28. int localSocket,
29. remoteSocket,
30. port = IP_PORT;
31. struct sockaddr_in localAddr,
32. remoteAddr;
33. pthread_t thread_id;
34. int addrLen = sizeof(struct sockaddr_in);
35. localSocket = socket(AF_INET , SOCK_STREAM , 0);
36. if (localSocket == -1){
37. perror("socket() call failed!!");
38. }
39. localAddr.sin_family = AF_INET;
40. localAddr.sin_addr.s_addr = INADDR_ANY;
41. localAddr.sin_port = htons( port );
42. if( bind(localSocket,(struct sockaddr *)&localAddr , sizeof(localAddr)) < 0) {
43. perror("Can't bind() socket");
44. exit(1);
45. }
46. //Listening
47. listen(localSocket , 3);
48. std::cout << "Waiting for connections...\n"
49. << "Server Port:" << port << std::endl;
50. //accept connection from an incoming client
51. while(1){
52. remoteSocket = accept(localSocket, (struct sockaddr *)&remoteAddr, (socklen_t*)&addrLen);
53. if (remoteSocket < 0) {
54. perror("accept failed!");
55. exit(1);
56. }
57. std::cout << "Connection accepted" << std::endl;
58. pthread_create(&thread_id,NULL,display,&remoteSocket);
59. //pthread_join(thread_id,NULL);
60. }
61. //pthread_join(thread_id,NULL);
62. //close(remoteSocket);
63. return 0;
64. }
65. void *display(void *ptr){
66. int socket = *(int *)ptr;
67. //OpenCV Code
68. //----------------------------------------------------------
69. Mat img, imgGray,imgColor;
70. img = Mat::zeros(480,640,CV_8UC3);
71. //make it continuous
72. if (!img.isContinuous()) {
73. img = img.clone();
74. }
75. // int imgSize = img.total() * img.elemSize();
76. int imgSize = img.total() * img.channels();
77. int bytes = 0;
78. int key;
79. //make img continuos
80. if ( !img.isContinuous() ) {
81. img = img.clone();
82. imgGray = img.clone();
83. }
84. std::cout << "Image Size:" << imgSize << std::endl;
85. while(1) {
86. /* get a frame from camera */
87. cap >> img;
88. if (img.empty()) break;
89. //cvtColor(img, imgGray, CV_RGB2GRAY); // color change
90. //send processed image
91. if ((bytes = send(socket, img.data, imgSize, 0)) < 0){
92. std::cerr << "bytes = " << bytes << std::endl;
93. break;
94. }
95. }
96. }