我用 NDK 在 android 上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。
我添加了
<uses-permission android:name="android.permission.INTERNET"/>
在清单中。
我尝试使用 telnet 进行重定向：
telnet localhost 5554
redir add tcp:6666:8888
这里的服务器代码：
#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");
}
以及主机上的客户端代码：
#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