虽然它似乎已正确实现，但当我使用环回地址（127.0.0.1）建立连接时，会继续返回 ERROR 。
除了简单的TCP客户端/服务器连接外，我还添加了一个案例：
如果客户端尝试发送数据但发现连接已关闭，则它也会关闭。我通过检查接收的数据是否等于0（recv）来执行。
给定错误：
CLIENT:
Welcome to the Client mode
Please, enter the Server's IP Address and Port (eg. 192.128.192.0 1320)
127.0.0.1 2700
Connected to the server. Now you can send messages
Please, enter a message. Enter "FINISH" if you want to finish the connection
ECHO
client: connection closed ->: Success
(1 bytes)Closing the connection
SERVER:
Hello and welcome to the Server mode
Please, enter the Server's Port (eg. 1320)
2700
Server socket successfully configured
Server listening [Clients allowed: 5]
server: accept error: Bad address
客户端实施：
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <netinet/ip.h>
/**
struct sockaddr{
uint8_t sa_len; // struct length
sa_family_t sa_family; //protocol family: AF_XXX
char sa_data[8]; //socket addr
}
*/
//void notConnected();
int main(){
struct sockaddr_in serv_addr; //port + ip_addr
int my_socket, tcp_port;
char serv_host_addr[30];
char buffer[1024], inbuff[1024];
int io_buffer;
printf("Welcome to the Client mode\n");
//CONFIGURING THE CONNECTION
my_socket = socket(AF_INET, SOCK_STREAM, 0);//(2)
if(my_socket < 0){
perror("client: socket() error ->");
exit(EXIT_FAILURE);
}
bzero(&serv_addr, sizeof(serv_addr));//(4)
printf("Please, enter the Server's IP Address and Port (eg. 192.128.192.0 1320) \n");
scanf("%s %d", serv_host_addr, &tcp_port);//(1)
serv_addr.sin_family = AF_INET ;
serv_addr.sin_port = htons(tcp_port);
if(inet_pton(AF_INET,serv_host_addr,&serv_addr.sin_addr) < 1){
perror("client: inet_pton() error ->");
exit(EXIT_FAILURE);
}
if((connect(my_socket, (struct sockaddr *) &serv_addr, sizeof(serv_addr) )) < 0)//(5)
{
perror("client: connect() error ->");
exit(EXIT_FAILURE);
}
//ONCE CONNECTED, START THE SENDING/RECEIVING
printf("Connected to the server. Now you can send messages\n");
bzero(&buffer, sizeof(buffer));
while(strcmp(buffer, "OK\n") != 0){
printf("Please, enter a message. Enter \"FINISH\" if you want to finish the connection\n");//(3)
bzero(&buffer, sizeof(buffer));
fgets(buffer, sizeof(buffer), stdin);
io_buffer = send(my_socket, buffer, strlen(buffer),0);//(6)
if(io_buffer < 0){
perror("client: send() error ->");
exit(EXIT_FAILURE);
}
printf("ECHO %s (%d bytes)", buffer, io_buffer);
//RECEIVE AND CHECK IF CONNECTION HAS BEEN CLOSED
io_buffer = recv(my_socket, buffer, sizeof(buffer),0);
if(io_buffer < 0){
perror("client: recv() error ->");
exit(EXIT_FAILURE);
}
else if(io_buffer == 0){ //THIS IS SERVER IS CLOSED
perror("client: connection closed ->");
break;
}
printf("ECHO %s (%d bytes)", buffer, io_buffer);
}
printf("Closing the connection \n");
for(int i=0; i < 5; i++){
printf(". ");
usleep(500000);
}
close(my_socket);
}
服务器实施：
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define LISTENQ 5
int main()
{
struct sockaddr_in cli_addr, serv_addr;
char buffer[1024];
int serv_socket, cli_socket, clilen, io_buffer;
int tcp_port;
printf("Hello and welcome to the Server mode\n");
// ASKING FOR PORT NUMBER
if((serv_socket = socket(AF_INET, SOCK_STREAM, 0)) < 0){
perror("server: can't open stream socket");
exit(EXIT_FAILURE);
}
printf("Please, enter the Server's Port (eg. 1320) \n");
scanf("%d", &tcp_port);
// CONFIGURING THE CONNECTION
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(tcp_port);
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
// ASSIGNING A NAME TO THE SOCKET
if(bind(serv_socket,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0){
perror("server: can't assign a name to the socket");
exit(EXIT_FAILURE);
}
printf("Server socket successfully configured\n");
printf("Server listening [Clients allowed: %d]\n", LISTENQ);
if(listen(serv_socket, LISTENQ) < 0)
{
perror("server: fail to listen network");
exit(EXIT_FAILURE);
}
// READ & WRITE STREAM
while(1){
//returns a file descriptor for the client
cli_socket = accept(serv_socket,(struct sockaddr *) &cli_addr,(socklen_t *) sizeof(cli_addr));
if(cli_socket < 0){
perror("server: accept error");
exit(EXIT_FAILURE);
}
printf("Server successfully connected to Client\n");
while(1)
{
if ((io_buffer=recv(cli_socket,buffer,sizeof(buffer),0))<0){
perror("ERROR: recv");
exit(EXIT_FAILURE);
}
printf("\"%s\" received from client", buffer);
if(strcmp(buffer, "FINISH") == 0)
{
break;
}
if ((io_buffer=send(cli_socket,buffer,strlen(buffer),0))!=strlen(buffer)){
perror("ERROR: send");
exit(EXIT_FAILURE);
}
bzero(buffer, sizeof(buffer));
}
strcpy(buffer, "OK");
if ((io_buffer=send(cli_socket, buffer, strlen(buffer), 0)) != strlen(buffer)){
perror("ERROR: send");
exit(EXIT_FAILURE);
}
printf("\"OK\" message sent to the Client.\n");
printf("Closing the connection \n");
for(int i=0; i < 5; i++)
{
printf(". ");
usleep(500000);
}
close(cli_socket);
}
}
答案 0 :(得分：10)
在原始问题中，您的接听电话如下：
cli_socket = accept(serv_socket,(struct sockaddr *) &cli_addr,
(socklen_t *) sizeof(cli_addr));
这会传递“(socklen_t *) sizeof(cli_addr)”作为接受的第三个参数。这应该是指向结构大小的指针。您应该传入指向socklen_t的指针，该socklen_t cli_addr_size = sizeof(cli_addr);
cli_socket = accept(serv_socket,(struct sockaddr *) &cli_addr,
&cli_addr_size);
包含作为参数2传递的结构的大小。您当前传入的大小被解释为一个地址，这会导致程序在引用时崩溃。代码应如下所示：
$ionicPush.init({
"canShowAlert": true, //Can pushes show an alert on your screen?
"canSetBadge": true, //Can pushes update app icon badges?
"canPlaySound": true, //Can notifications play a sound?
"canRunActionsOnWake": true, //Can run actions outside the app,
"debug": true,
"onNotification": function (notification) {
console.log("onNotification");
var payload = notification.payload;
console.log(notification);
var title = "SmartCam mobile";
var message = $translate.instant('Cam') + " : " + $translate.instant(payload.eventType) + " " + $translate.instant("registered at") + " " + payload.time;
notificationService.showNotification(title, message, payload);
},
"onRegister": function (data) {
console.log("onRegister");
console.log(data.token);
localStorageService.set("STORED_VALUES_PUSH_TOKEN", data.token);
localStorageService.set("STORED_VALUES_PLATFORM", ionic.Platform.platform().toLowerCase());
}
});