C语言的Socket编程例子（TCP和UDP）

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匿名技术用户   2021-1-2 20:04   11   0

<TCP>

server端：

[cpp] view plain copy
  1. #include "stdafx.h"
  2. #include <stdio.h>
  3. #include <winsock2.h>
  5. #pragma comment(lib,"ws2_32.lib")
  7. int main(int argc, char* argv[])
  8. {
  9. //初始化WSA
  10. WORD sockVersion = MAKEWORD(2,2);
  11. WSADATA wsaData;
  12. if(WSAStartup(sockVersion, &wsaData)!=0)
  13. {
  14. return 0;
  15. }
  17. //创建套接字
  18. SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  19. if(slisten == INVALID_SOCKET)
  20. {
  21. printf("socket error !");
  22. return 0;
  23. }
  25. //绑定IP和端口
  26. sockaddr_in sin;
  27. sin.sin_family = AF_INET;
  28. sin.sin_port = htons(8888);
  29. sin.sin_addr.S_un.S_addr = INADDR_ANY;
  30. if(bind(slisten, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)
  31. {
  32. printf("bind error !");
  33. }
  35. //开始监听
  36. if(listen(slisten, 5) == SOCKET_ERROR)
  37. {
  38. printf("listen error !");
  39. return 0;
  40. }
  42. //循环接收数据
  43. SOCKET sClient;
  44. sockaddr_in remoteAddr;
  45. int nAddrlen = sizeof(remoteAddr);
  46. char revData[255];
  47. while (true)
  48. {
  49. printf("等待连接...\n");
  50. sClient = accept(slisten, (SOCKADDR *)&remoteAddr, &nAddrlen);
  51. if(sClient == INVALID_SOCKET)
  52. {
  53. printf("accept error !");
  54. continue;
  55. }
  56. printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));
  58. //接收数据
  59. int ret = recv(sClient, revData, 255, 0);
  60. if(ret > 0)
  61. {
  62. revData[ret] = 0x00;
  63. printf(revData);
  64. }
  66. //发送数据
  67. char * sendData = "你好，TCP客户端！\n";
  68. send(sClient, sendData, strlen(sendData), 0);
  69. closesocket(sClient);
  70. }
  72. closesocket(slisten);
  73. WSACleanup();
  74. return 0;
  75. }


client端：

[cpp] view plain copy
  1. #include "stdafx.h"
  2. #include <WINSOCK2.H>
  3. #include <STDIO.H>
  5. #pragma comment(lib,"ws2_32.lib")
  8. int main(int argc, char* argv[])
  9. {
  10. WORD sockVersion = MAKEWORD(2,2);
  11. WSADATA data;
  12. if(WSAStartup(sockVersion, &data) != 0)
  13. {
  14. return 0;
  15. }
  17. SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  18. if(sclient == INVALID_SOCKET)
  19. {
  20. printf("invalid socket !");
  21. return 0;
  22. }
  24. sockaddr_in serAddr;
  25. serAddr.sin_family = AF_INET;
  26. serAddr.sin_port = htons(8888);
  27. serAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
  28. if (connect(sclient, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)
  29. {
  30. printf("connect error !");
  31. closesocket(sclient);
  32. return 0;
  33. }
  34. char * sendData = "你好，TCP服务端，我是客户端!\n";
  35. send(sclient, sendData, strlen(sendData), 0);
  37. char recData[255];
  38. int ret = recv(sclient, recData, 255, 0);
  39. if(ret > 0)
  40. {
  41. recData[ret] = 0x00;
  42. printf(recData);
  43. }
  44. closesocket(sclient);
  45. WSACleanup();
  46. return 0;
  47. }


二. <UDP>

SERVER 端

[cpp] view plain copy
  1. #include "stdafx.h"
  2. #include <stdio.h>
  3. #include <winsock2.h>
  5. #pragma comment(lib, "ws2_32.lib")
  7. int main(int argc, char* argv[])
  8. {
  9. WSADATA wsaData;
  10. WORD sockVersion = MAKEWORD(2,2);
  11. if(WSAStartup(sockVersion, &wsaData) != 0)
  12. {
  13. return 0;
  14. }
  16. SOCKET serSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
  17. if(serSocket == INVALID_SOCKET)
  18. {
  19. printf("socket error !");
  20. return 0;
  21. }
  23. sockaddr_in serAddr;
  24. serAddr.sin_family = AF_INET;
  25. serAddr.sin_port = htons(8888);
  26. serAddr.sin_addr.S_un.S_addr = INADDR_ANY;
  27. if(bind(serSocket, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)
  28. {
  29. printf("bind error !");
  30. closesocket(serSocket);
  31. return 0;
  32. }
  34. sockaddr_in remoteAddr;
  35. int nAddrLen = sizeof(remoteAddr);
  36. while (true)
  37. {
  38. char recvData[255];
  39. int ret = recvfrom(serSocket, recvData, 255, 0, (sockaddr *)&remoteAddr, &nAddrLen);
  40. if (ret > 0)
  41. {
  42. recvData[ret] = 0x00;
  43. printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));
  44. printf(recvData);
  45. }
  47. char * sendData = "一个来自服务端的UDP数据包\n";
  48. sendto(serSocket, sendData, strlen(sendData), 0, (sockaddr *)&remoteAddr, nAddrLen);
  50. }
  51. closesocket(serSocket);
  52. WSACleanup();
  53. return 0;
  54. }


CLIENT 端

[cpp] view plain copy
  1. #include "stdafx.h"
  2. #include <stdio.h>
  3. #include <winsock2.h>
  5. #pragma comment(lib, "ws2_32.lib")
  7. int main(int argc, char* argv[])
  8. {
  9. WORD socketVersion = MAKEWORD(2,2);
  10. WSADATA wsaData;
  11. if(WSAStartup(socketVersion, &wsaData) != 0)
  12. {
  13. return 0;
  14. }
  15. SOCKET sclient = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
  17. sockaddr_in sin;
  18. sin.sin_family = AF_INET;
  19. sin.sin_port = htons(8888);
  20. sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
  21. int len = sizeof(sin);
  23. char * sendData = "来自客户端的数据包.\n";
  24. sendto(sclient, sendData, strlen(sendData), 0, (sockaddr *)&sin, len);
  26. char recvData[255];
  27. int ret = recvfrom(sclient, recvData, 255, 0, (sockaddr *)&sin, &len);
  28. if(ret > 0)
  29. {
  30. recvData[ret] = 0x00;
  31. printf(recvData);
  32. }
  34. closesocket(sclient);
  35. WSACleanup();
  36. return 0;
  37. }

http://www.cnblogs.com/zjutlitao/p/3622030.html
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