如何实现服务器与客户端之间通信(页 1) - C/C++ (STL/boost) - Linux伊甸园论坛

岁月无声 发表于 2006-4-20 18:17

如何实现服务器与客户端之间通信

要实现如下功能：

[font=宋体]服务器绑定端口号为3000。[/font]| r9Wa8z d a1DVu

[font=宋体]客户端发送“GET”指令，服务器端将字符串“Welcome You发送给客户端[/font]
/Wk1Wp;Kg9Pl_&N8W
[font=宋体]接收到客户端返回的“success”信息后断开连接。[/font]~Xn2WXVPj

[font=宋体]往服务器的3000端口发送“GET”指令，接收信息，并将接受到的信息写入到文件msg中。[/font]
S3E.^|,cBT _
[font=宋体]成功后回复服务器“[/font][font=Times New Roman]success[/font][font=宋体]”信息，断开连接。[/font]

[font=宋体]程序如下：[/font]
[font=宋体]服务器：[/font]R9c!@bc Du
[font=宋体]#include <stdio.h>
#include <stdlib.h>4W P-Aa7v.fx
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>~qbJ;EX
#include <sys/socket.h>YJ$d1vd:O
#include <sys/wait.h>7J+~j!tB;jM3{
#define SERVPORT 3000
#define BACKLOG 109Tgvl({1mI n&h
int main() {;E.`f2v5P;bJ3W9K
int sockfd, client_fd, recvbytes;
char buf[MAXDATASIZE];*`/`ke6_0[6Os
struct sockaddr_in my_addr;
struct sockaddr_in remote_addr;
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket....."); exit(1);
}+[Q(dJK p ]-d
my_addr.sin_family=AF_INET;Y&@rbR?x'Kj
my_addr.sin_port=htons(SERVPORT);*Q4arRx;Hn*C [W
my_addr.sin_addr.s_addr = INADDR_ANY;7{9HZl*yk rA
bzero(&(my_addr.sin_zero),8);uz S:iVH{
if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) {
perror("bind...");
exit(1);!n/e&JAH@E
}R8TlA1tQ,Ug
if (listen(sockfd, BACKLOG) == -1) {
perror("listen...");\J"?e,wGX
exit(1);%i&v;w|H"G.|d%z
}b?tn3E!r/{
while(1) {
sin_size = sizeof(struct sockaddr_in);
if ((client_fd = accept(sockfd, (struct sockaddr *)&remote_addr, &sin_size)) == -1) {
perror("accept..");
continue;
}
printf("received a connection from %s\n", inet_ntoa(remote_addr.sin_addr));ndK/\wh$mh&a`

if ((recvbytes=recv(sockfd, buf, MAXDATASIZE, 0)) == -1) {8b5zdG:pWi6fs+o|
perror("recv...");.[ {2Zr"kC&Xll
exit(1);9q] Ub$Ga&X
}[/font]&?4y|BV @g
[font=宋体]if (!fork()) {qq{L!g}(M6S
if (send(client_fd, "Welcome You\n", 12, 0) == -1)
perror("send...");c*Tv1vPt Pxk
close(client_fd);
exit(0);
}q}k/[.M
if ((recvbytes=recv(sockfd, buf, MAXDATASIZE, 0)) == -1) {5[%QTe~!{EFQj
perror("recv...");
exit(1);
};WX Z*?7F
close(client_fd);
}
return 0;
} [/font]
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[font=宋体]客户端[/font]\l&BI&yI-S
[font=宋体]#include <stdio.h>}*_(pCpfq$WH
#include <stdlib.h>
#include <errno.h>
#include <string.h>PY;tT5`Uw;F
#include <netdb.h>
#include <sys/types.h>TIg[H8ns
#include <netinet/in.h>,x E$~:L(eZ9Ub?8}
#include <sys/socket.h>_7Z(TZ-QV\4G
#define SERVPORT 3000*U8R'`&Hqef/U3`A
#define MAXDATASIZE 100f%UX^q8V:vn
int main(int argc, char *argv[]) {
FILE *fp;!f Dw6Z/~%t;[
int sockfd, recvbytes, client_fd;
char buf[MAXDATASIZE];8|'S8U n'l@ F
struct hostent *host;f%{\^z4rd/bsgs
struct sockaddr_in serv_addr;
if(argc < 2) {'hJ1`fb
fprintf(stderr,"Please enter the server's hostname!\n");:h0vtIL"I
exit(1);R.UJx-a'o
}
if((host = gethostbyname(argv[1]))==NULL) {S$B~GM1y
herror("gethostbyname...");&M~/af]f
exit(1);%kX+odm
}
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1){
perror("socket.....");
exit(1);
},s&ydOqRe
serv_addr.sin_family = AF_INET;s iw,k:le
serv_addr.sin_port = htons(SERVPORT);
serv_addr.sin_addr = *((struct in_addr *)host->h_addr);`7C$Ar {#c#ke
bzero(&(serv_addr.sin_zero), 8);
if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(struct sockaddr)) == -1) {q.MO)`W:^I]d
perror("connect...");
exit(1);(dar'D Oh a
}
if (!fork()) {;Lb[7[U G3f-~R
if (send(client_fd, "GET\n", 4, 0) == -1)
perror("send...");
close(client_fd);~1l!{*Y*f c+A4A.T?4q
exit(0);+T;rqg7} C;t5`.[4[
}
if ((recvbytes=recv(sockfd, buf, MAXDATASIZE, 0)) == -1) {&xn1b+kW,ao
perror("recv...");
exit(1);z*i#|"PY2h
};V-D#it;N]1i`ME

fp=fopen("test.dat", "w");
fputs(buf, fp);[/font]&` eKweB
[font=宋体]if (!fork()) {
if (send(client_fd, "success\n", 4, 0) == -1)z8~ F8Iemy_
perror("send...");
close(client_fd);
exit(0);
}1B;L W Nf
buf[recvbytes] = '\0';#w(_`A2L!Dt S{
printf("Received: %s", buf);4U2m:}*I-vlwN}
close(sockfd);{r3bcl{,\&_6B] K!_
}[/font]\#ea1s&F5}B!p
o}Ky c:BW
[font=宋体]请高手们看看有什么问题，谢谢[/font]

flag 发表于 2006-4-21 09:42

你有什么问题先？

岁月无声 发表于 2006-4-21 13:28

就是这段程序能否实现通信的功能

flag 发表于 2006-4-21 13:51

哈，能不能你自己做不了主吗？是你要来这里问问题，请认真一点。

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如何实现服务器与客户端之间通信