无法从主机上连接到Android模拟器上的服务器

Question

我在android上用NDK编写了简单的服务器，它将在android模拟器上的端口8888上工作，但我无法从主机上的客户端连接到它。

我在明显增加

<uses-permission android:name="android.permission.INTERNET"/> 

。

我试图让重定向通过telnet：

telnet localhost 5554 
redir add tcp:6666:8888 

这里服务器的代码：

#include "stdafx.h" 
#include <winsock2.h> 
#include <windows.h> 
#include <fcntl.h> 
#include <string.h> 
#include <stdlib.h> 
#include <errno.h> 
#include <stdio.h> 
#include <conio.h> 
#include <iostream> 

#pragma comment(lib, "Ws2_32.lib") 

using namespace std; 

int _tmain(int argc, _TCHAR* argv[]) 
{ 

int host_port= 6666; 
char* host_name= "localhost"; 

unsigned short wVersionRequested; 
WSADATA wsaData; 
int err; 
wVersionRequested = MAKEWORD(2, 2); 
err = WSAStartup(wVersionRequested, &wsaData); 

if (err != 0 || (LOBYTE(wsaData.wVersion) != 2 || 
HIBYTE(wsaData.wVersion) != 2)) { 
fprintf(stderr, "Could not find useable sock dll %d\n",WSAGetLastError()); 
return 0; 
} 

int hsock; 
int * p_int ; 
hsock = socket(AF_INET, SOCK_STREAM, 0); 
if(hsock == -1){ 
printf("Error initializing socket %d\n",WSAGetLastError()); 
return 0; 
} 

p_int = (int*)malloc(sizeof(int)); 
*p_int = 1; 

if((setsockopt(hsock, SOL_SOCKET, SO_REUSEADDR, (char*)p_int, sizeof(int)) == -1)|| 
(setsockopt(hsock, SOL_SOCKET, SO_KEEPALIVE, (char*)p_int, sizeof(int)) == -1)){ 
printf("Error setting options %d\n", WSAGetLastError()); 
free(p_int); 
return 0; 
} 
free(p_int); 

struct sockaddr_in my_addr; 

my_addr.sin_family = AF_INET ; 
my_addr.sin_port = htons(host_port); 

memset(&(my_addr.sin_zero), 0, 8); 
my_addr.sin_addr.s_addr = inet_addr(host_name); 

cout<<"client ready\n"; 
if(connect(hsock, (struct sockaddr*)&my_addr, sizeof(my_addr)) == SOCKET_ERROR){ 
fprintf(stderr, "Error connecting socket %d\n", WSAGetLastError()); getchar(); 
return 0; 
} 
cout<<"connected to server\n"; 

char buffer[1024]; 
int buffer_len = 1024; 
int bytecount; 

int c; 
memset(buffer, '\0', buffer_len); 

for(char* p=buffer ; (c=getch())!=13 ; p++){ 
printf("%c", c); 
*p = c; 
} 

if((bytecount=send(hsock, buffer, strlen(buffer),0))==SOCKET_ERROR){ 
fprintf(stderr, "Error sending data %d\n", WSAGetLastError()); 
return 0; 
} 
printf("Sent bytes %d\n", bytecount); 

if((bytecount = recv(hsock, buffer, buffer_len, 0))==SOCKET_ERROR){ 
fprintf(stderr, "Error receiving data %d\n", WSAGetLastError()); 
return 0; 
} 
printf("Recieved bytes %d\nReceived string \"%s\"\n", bytecount, buffer); 

closesocket(hsock); 

return 0; 
} 

块引用

：

#include <string.h> 
#include <jni.h> 

#include <stdio.h> 
#include <string.h> 
#include <sys/socket.h> 
#include <arpa/inet.h> 
#include <unistd.h> 

jstring 
Java_com_example_hellojni_HelloJni_stringFromJNI(JNIEnv* env, 
jobject thiz) 
{ 
int socket_desc , client_sock , c , read_size; 
struct sockaddr_in server , client; 
char* client_message; 
int LEN = 512; 

client_message = "I am android server"; 

socket_desc = socket(AF_INET , SOCK_STREAM , 0); 
if (socket_desc == -1) 
{ 
return (*env)->NewStringUTF(env, "Could not create socket"); 
} 

server.sin_family = AF_INET; 
server.sin_addr.s_addr = INADDR_ANY; 
server.sin_port = htons(8888); 

if(bind(socket_desc,(struct sockaddr *)&server , sizeof(server)) < 0) 
{ 
return (*env)->NewStringUTF(env, "bind failed. Error"); 
} 

listen(socket_desc , 3); 

c = sizeof(struct sockaddr_in); 

client_sock = accept(socket_desc, (struct sockaddr *)&client, (socklen_t*)&c); 
if (client_sock < 0) 
{ 
return (*env)->NewStringUTF(env, "accept failed"); 
} 

while((read_size = recv(client_sock , buf , 2*LEN+1 , 0)) > 0) 
{ 
write(client_sock , client_message , strlen(client_message)); 
} 

if(read_size == 0) 
{ 
return (*env)->NewStringUTF(env, "Client disconnected"); 
} 
else if(read_size == -1) 
{ 
return (*env)->NewStringUTF(env, "recv failed"); 
} 

return (*env)->NewStringUTF(env, "Server closed"); 
} 

和客户端的代码的主机上

Answer 1

解决！

可以出现，因为我的Windows防火墙阻止此端口（在我的情况下，6666）和客户端无法连接到服务器上的模拟器

解锁在Windows端口 - 打开防火墙的额外选项和收入连接添加规则（免费为所有）