多播服务器c和.bat文件来打开它

最近，我第一次与服务器打交道：

案例是：我有一个软件（Motive来自Optitrack），它通过多播提供数据流

我曾尝试修改以前的程序，它可以构建，但我有一些问题需要解决：

1º-我需要一个.bat文件来自动打开带有argc参数的服务器，我已经创建了一个，但它不起作用。代码在末尾

2º执行.exe文件时，控制台会暂停片刻并关闭。我想这是因为它返回-1，但代码中可能有一些错误

我在Windows10上，使用Code:：Blocks和Gcc编译器

服务器代码为：

#include <sys/types.h>  /* for type definitions */
#include <winsock2.h>   /* for win socket API calls */
#include <ws2tcpip.h>   /* for win socket structs */
#include <stdio.h>      /* for printf() and fprintf() */
#include <stdlib.h>     /* for atoi() */
#include <string.h>     /* for strlen() */

#define MAX_LEN  1024   /* maximum receive string size */
#define MIN_PORT 1051   /* minimum port allowed */
#define MAX_PORT 1051 /* maximum port allowed */
#define NUM_RIG_OBJ 2


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

  int sock;                     /* socket descriptor */
  int flag_on = 1;              /* socket option flag */
  struct sockaddr_in mc_addr;   /* socket address structure */
  char recv_str[MAX_LEN+1];     /* buffer to receive string */
  int recv_len, ID ;                 /* length of string received */
  struct ip_mreq mc_req;        /* multicast request structure */
  char* mc_addr_str   ;         /* multicast IP address */
  unsigned short mc_port;       /* multicast port */
  struct sockaddr_in from_addr; /* packet source */
  unsigned int from_len;        /* source addr length */
  WSADATA wsaData;              /* Windows socket DLL structure */
float xa,ya,za,qx,qy,qz,qw;


  /* validate number of arguments */

  if (argc != 3) {
    fprintf(stderr,
            "Usage: %s <Multicast IP> <Multicast Port>\n",
            argv[0]);
    exit(1);
  }

  mc_addr_str = argv[1];      /* arg 1: multicast ip address */
  mc_port = atoi(argv[2]);    /* arg 2: multicast port number */



  /* validate the port range */
  if ((mc_port < MIN_PORT) || (mc_port > MAX_PORT)) {
    fprintf(stderr, "Invalid port number argument %d.\n",
            mc_port);
    fprintf(stderr, "Valid range is between %d and %d.\n",
            MIN_PORT, MAX_PORT);
    exit(1);
  }

  /* Load Winsock 2.0 DLL */
  if (WSAStartup(MAKEWORD(2, 0), &wsaData) != 0) {
    fprintf(stderr, "WSAStartup() failed");
    exit(1);
  }

  /* create socket to join multicast group on */
  if ((sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
    perror("socket() failed");
    exit(1);
  }

  /* set reuse port to on to allow multiple binds per host */
  if ((setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char*)&flag_on,
       sizeof(flag_on))) < 0) {
    perror("setsockopt() failed");
    exit(1);
  }

  /* construct a multicast address structure */
  memset(&mc_addr, 0, sizeof(mc_addr));
  mc_addr.sin_family      = AF_INET;
  mc_addr.sin_addr.s_addr = htonl(INADDR_ANY);
  mc_addr.sin_port        = htons(mc_port);

  /* bind to multicast address to socket */
  if ((bind(sock, (struct sockaddr *) &mc_addr,
       sizeof(mc_addr))) < 0) {
    perror("bind() failed");
    exit(1);
  }

  /* construct an IGMP join request structure */
  mc_req.imr_multiaddr.s_addr = inet_addr(mc_addr_str);
  mc_req.imr_interface.s_addr = htonl(INADDR_ANY);

  /* send an ADD MEMBERSHIP message via setsockopt */
  if ((setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP,
       (char*) &mc_req, sizeof(mc_req))) < 0) {
    perror("setsockopt() failed");
    exit(1);
  }

        int md=recv_str[0];
      char *ptr = recv_str;
         float x[NUM_RIG_OBJ]= {0};
         float y[NUM_RIG_OBJ]= {0};
         float z[NUM_RIG_OBJ]= {0};
         float q1[NUM_RIG_OBJ]= {0};
         float q2[NUM_RIG_OBJ]= {0};
         float q3[NUM_RIG_OBJ]= {0};
         float q4[NUM_RIG_OBJ]= {0};

  for (;;) {          /* loop forever */

    /* clear the receive buffers & structs */
    memset(recv_str, 0, sizeof(recv_str));
    from_len = sizeof(from_addr);
    memset(&from_addr, 0, from_len);

    /* block waiting to receive a packet */
    if ((recv_len = recvfrom(sock, recv_str, MAX_LEN, 0,
         (struct sockaddr*)&from_addr, &from_len)) < 0) {
      perror("recvfrom() failed");
      exit(1);
    }

    /* output received string */
    printf("Received %d bytes from %s: ", recv_len,
           inet_ntoa(from_addr.sin_addr));
    printf("%s", recv_str);

            // rigid body pos/ori

            if (md==7){
        for (int i=0;i<NUM_RIG_OBJ;i++){

            memcpy(&ID, ptr, 4); ptr += 4;
            memcpy(&xa, ptr, 4); ptr += 4;
            memcpy(&ya, ptr, 4); ptr += 4;
            memcpy(&za, ptr, 4); ptr += 4;
            memcpy(&qx, ptr, 4); ptr += 4;
            memcpy(&qy, ptr, 4); ptr += 4;
            memcpy(&qz, ptr, 4); ptr += 4;
            memcpy(&qw, ptr, 4); ptr += 4;
            printf("ID : %d\n", ID);
            printf("pos: [%3.4f,%3.4f,%3.4f]\n", xa,ya,za);
            printf("ori: [%3.4f,%3.4f,%3.4f,%3.4f]\n", qx,qy,qz,qw);


            x[i]=xa;
            y[i]=ya;
            z[i]=za;
            q1[i]=qx;
            q2[i]=qy;
            q3[i]=qz;
            q4[i]=qw;

              ptr = recv_str;
              memcpy(ptr, &i, 4); ptr += 4;
              memcpy(ptr, &x[i], 4); ptr += 4;
              memcpy(ptr, &y[i], 4); ptr += 4;
              memcpy(ptr, &z[i], 4); ptr += 4;
              memcpy(ptr, &q1[i], 4); ptr += 4;
              memcpy(ptr, &q2[i], 4); ptr += 4;
              memcpy(ptr, &q3[i], 4); ptr += 4;
              memcpy(ptr, &q4[i], 4); ptr += 4;
            }



  }



  /* send a DROP MEMBERSHIP message via setsockopt */
  if ((setsockopt(sock, IPPROTO_IP, IP_DROP_MEMBERSHIP,
       (void*) &mc_req, sizeof(mc_req))) < 0) {
    perror("setsockopt() failed");
    exit(1);
  }

  closesocket(sock);
  WSACleanup();  /* Cleanup Winsock */

}
return 0;
}

---

任何建议都将不胜感激。

---

谢谢

现在是时候了。等待：此服务器运行的是Windows还是Linux？因为您使用

start

启动程序，所以会为其打开一个单独的窗口。该窗口将在程序完成后立即关闭，因此如果打印错误消息，您将无法看到它。启动命令提示符，然后在没有.bat文件和

Start

的情况下从那里手动运行程序。这样，即使在输出完成并从那里调试之后，您也可以看到输出。发布的代码应该使用

recv_len

来NUL终止缓冲区

recv_str

，否则调用

printf（）

将执行未定义的行为。此时在程序中：

int md=recv_str[0]

buffer

recv_str

包含缓冲区所在堆栈上的垃圾，因此此语句：

如果（md==7）{

期望堆栈中的某个随机值为7，则不太可能出现这种情况。

echo Opening server...
cd C:\Users\Optitrack\Desktop\Conrado\mcreceive
start mcreceive.exe 259.44.99.107 1051