之後數組值出現意外的改變,我運行了兩個客戶端實例。現在我第一次運行客戶端,接收到的數據被保存到數組[0]中,但是當我運行第二個客戶端時,array [0]的值會被新值覆蓋。新數據將保存在數組[1]中而不是覆蓋。我犯了什麼錯誤?在我運行服務器之後recv()
char * Array [100]; int ArrayCount = 0;是全局變量。
void *server()
{
int listenfd = 0;
connfd = 0;
struct sockaddr_in serv_addr;
listenfd = socket(AF_INET, SOCK_STREAM, 0);
memset(&serv_addr, '0', sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
serv_addr.sin_port = htons(atoi(port));
if(bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr))<0)
{
perror("bind");
exit(1);
}
listen(listenfd, 10);
while(1)
{
connfd = accept(listenfd, (struct sockaddr*)NULL, NULL);
printf("data in Array[0] before recv : %s\n",Array[0]);
int ns;
char revdData[2000];
bzero(revdData,2000);
ns = recv(connfd,revdData,2000,0);
close(connfd);
printf("data in Array[0] after recv : %s\n",Array[0]);
Array[ArrayCount] = revdData;
ArrayCount = ArrayCount+1;
}
}
客戶機代碼
void *client()
{
int soctype = SOCK_STREAM;
struct hostent *hp, *gethostbyname();
struct sockaddr_in servR;
struct servent *seR;
int tempSocket;
char *host = "localhost";
if ((tempSocket = socket(AF_INET, soctype, 0)) < 0)
{
perror("socket");
exit(1);
}
if ((hp = gethostbyname(host)) == NULL)
{
exit(1);
}
servR.sin_family = AF_INET;
memcpy(&servR.sin_addr, hp->h_addr, hp->h_length);
if (isdigit(*port))
{
servR.sin_port = htons(atoi(port));
}
else
{
if ((seR = getservbyname(port, (char *)NULL)) < (struct servent *) 0)
{
perror(port);
exit(1);
}
servR.sin_port = seR->s_port;
}
if (connect(tempSocket, (struct sockaddr *) &servR, sizeof(servR)) < 0)
{
perror("connect");
exit(1);
}
char input[100];
fgets(input,100,stdin);
int n;
n=send(tempSocket,input,100,0);
if (n < 0)
{
error("Send");
}
}
輸出如下:
data in Array[0] before recv : (null)
data in Array[0] after recv : (null)
data in Array[0] before recv : 1st Instance
data in Array[0] after recv : 2nd Instance
的recv後理想地數據應該是 「第一實例」,因爲我打印陣列[0]。
'struct hostent * hp,* gethostbyname();'是壞的。相反,'#include'適當的頭文件。或者更好,用新的getaddrinfo()和getnameinfo()替換'getservbyname()'和'gethostbyname()'。 – glglgl