绑定失败，错误代码：10048

Question

我开始在Windows上用C语言编写套接字，只是为了学习如何在客户端和服务器应用程序中使用套接字，这是一个简单的例子。

这是我的服务器代码

#if defined WIN32
#include <winsock2.h>
#include <winsock.h>
#else
#define closesocket closeter 
#include <sys/socket.h>
#include <arp /a inet.h>
#include <unistd.h>
#endif
#include <stdio.h>
#include <stdlib.h> // for atoi()
#define PROTOPORT 8080 // default protocol port number
#define QLEN 6 // size of request queue

void ErrorHandler(char *errorMessage) {
    printf(errorMessage);
 }
void ClearWinSock() {
 #if defined WIN32
   WSACleanup();
 #endif
 }

int main(int argc, char *argv[]) {

    int port;

    if (argc > 1) {
       port = atoi(argv[1]);
    } else
       port = PROTOPORT; // use default port number

    if (port < 0) {
       printf("bad port number %s \n", argv[1]);
       return 0;
    }

    #if defined WIN32 // initialize Winsock
      WSADATA wsaData;
      int iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
      if (iResult != 0) {
         ErrorHandler("Error at WSAStartup()\n");
         return 0;
      }
    #endif

    int MySocket;
    MySocket = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);

    if (MySocket < 0) {
       ErrorHandler("socket creation failed.\n");
       ClearWinSock();
       return 0;
    }

    struct sockaddr_in sad;
    memset(&sad, 0, sizeof(sad)); // ensures that extra bytes contain 0
    sad.sin_family = AF_INET;
    sad.sin_addr.s_addr = inet_addr("127.0.0.1");
    sad.sin_port = htons(port); 

    if (bind(MySocket, (struct sockaddr*) &sad, sizeof(sad)) < 0) {
       printf("Bind failed with error code : %d" , WSAGetLastError());
       closesocket(MySocket);
       ClearWinSock();
       return 0;
    }



    if (listen (MySocket, QLEN) < 0) {
       ErrorHandler("listen() failed.\n");
       closesocket(MySocket);
       ClearWinSock();
       return 0;
    }

    struct sockaddr_in cad; // structure for the client address
    int clientSocket; // socket descriptor for the client
    int clientLen; // the size of the client address
    printf("Waiting for a client to connect...");

    while (1) { 
          clientLen = sizeof(cad); // set the size of the client address
          if ((clientSocket = accept(MySocket, (struct sockaddr *)&cad,
           &clientLen)) < 0) {
               ErrorHandler("accept() filed.\n");

               closesocket(MySocket);
               ClearWinSock();
               return 0;
           }
          printf("Handling client %s\n", inet_ntoa(cad.sin_addr));
       }
}// end of main

当我运行它时，控制台会显示以下消息： 绑定失败，错误代码：10048 这意味着函数bind返回非零值，因此发生错误，10048错误。我知道这个错误意味着spicified端口已被其他应用程序使用，所以我试图多次更改端口号，但它仍然显示我相同的错误。 谢谢你的帮助！