一个消息队列例子，第一次运行正确，第二次运行就提示消息发送失败了
第一次运行还能正确发送消息，第二次运行就无法发出消息，请大家指点下，谢谢。

C/C++ code

#include <sys/types.h>#include <sys/ipc.h>#include <sys/msg.h>#include <stdio.h>#include <stdlib.h>#include <string.h>int main(void){    key_t unique_key;    int msgid;    int status;    char str1[] = {"test message:hello!"};    char str2[] = {"test message:goodbye!"};    struct msgbuf    {        long msgtype;        char msgtext[1024];    }sndmsg,rcvmsg;    if(msgid = msgget(IPC_PRIVATE, 0666) == -1)    {        printf("msgget error!\n");        exit(254);    }    sndmsg.msgtype = 111;    sprintf(sndmsg.msgtext, "%s", str1);    if(msgsnd(msgid, (struct msgbuf *)&sndmsg, sizeof(str1)+1, 0) == -1)    {        printf("msgtype 111 send error!\n");        exit(254);    }    if(status = msgrcv(msgid, (struct msgbuf *)&rcvmsg,80,111,IPC_NOWAIT) == -1)    {        printf("msgrcv error!\n");        exit(254);    }    printf("The received message:%s\n",rcvmsg.msgtext);    msgctl(msgid, IPC_RMID, 0);    exit(0);}

[解决办法]
改成if( ( msgid=(msgget(IPC_PRIVATE, 0660))) == -1)

ipcs -qa 就发现异常了，一下子多了那么多队列
[解决办法]
嗯，典型的C语法错误
if((msgid = msgget(IPC_PRIVATE, 0666)) == -1)
[解决办法]
sizeof(str1)+1 这不对哦，不需要+1，不过你这里是先拷贝过去的，多发也不是越界而已。
[解决办法]
if(msgid = msgget(IPC_PRIVATE, 0666) == -1)
少加了括号，应该是if((msgid = msgget(IPC_PRIVATE, 0666)) == -1)