erlang 与 C++通信

%%ser.erl

-module(ser).

-export([server/0,start/2,stop/1]).

-behaviour(application).

%%数字类型

-define( UINT, 32/unsigned-little-integer).

-define( INT, 32/signed-little-integer).

-define( USHORT, 16/unsigned-little-integer).

-define( SHORT, 16/signed-little-integer).

-define( UBYTE, 8/unsigned-little-integer).

-define( BYTE, 8/signed-little-integer).

start(_type,Argu) ->

server().

%%启动服务并接受客户端的连接

server() ->

    {ok, LSock} =gen_tcp:listen(5678, [binary, {packet, 0},{active,false}]),

    {ok, Sock} =gen_tcp:accept(LSock),

    {ok, Bin} = do_recv(Sock, []),

    Bin.

stop(S) ->

  void.

do_recv(LSock, []) ->

    case gen_tcp:recv(LSock, 0) of

        %%匹配Len，Cmd，Contain  接收的时候最好不要多接收,否则可能匹配不了,

        %%C++网络通信中,发送字符串会带结束符(sizeof),如果不带,接收的数据后面可能会显示乱码,

        %%当然,你可以手动在字符串后面添加上结束符。

        %%erlang中没字符串概念,全部以ASCII码形式显示,如果有结束符的话,那就等于多了一个字节

        %%(正常是先接收头部的，这里简略了，一次性接收)

        {ok, <<Len:?USHORT,Cmd:?USHORT,Contain:4/binary-unit:8, Rest/binary>>} ->

            io:format("~p ~p ~p ~p ~n",['recv data:',Len,Cmd,Contain]),

            %%把收到的内容 发送回去

            Bd = <<Contain/binary>>,

            gen_tcp:send(LSock,Bd),

            do_recv(LSock,[]);

        {error, _} ->

            {error, []}

    end.

#include <netinet/in.h>    // for sockaddr_in

#include <sys/types.h>    // for socket

#include <sys/socket.h>    // for socket

#include <stdio.h>        // for printf

#include <stdlib.h>        // for exit

#include <string.h>        // for bzero>

#include <sys/time.h>

struct tem{

unsigned short int i;

unsigned short int j;

char p[4] ;

}temp;

int main(){

char buff[255];

struct sockaddr_in ser;

ser.sin_family = AF_INET;

ser.sin_port = htons(5678);

inet_aton("192.168.0.99",&ser.sin_addr);

//

  temp.i = 10001;

temp.j = 20001;

strcpy(temp.p,"test");

int s_cli = socket(AF_INET,SOCK_STREAM,0);

if(!s_cli){

printf("socket init failed!\n");

exit(1);

}

int c_cli = connect(s_cli,(struct sockaddr *)&ser,sizeof(struct sockaddr));

if(c_cli<0){

printf("connect failed!\n");

exit(1);

}

int i = 1;

while(1){

int se_cli = send(s_cli,(void *)&temp,sizeof(temp),0);

if(!se_cli){

printf("send failed!\n");

}

printf("send...\n");

se_cli  = recv(s_cli,(struct temp *)buff,255,0);

buff[se_cli] = NULL;

printf("recv[%d]...:%s data_len:%d..\n",i++,buff,se_cli);

sleep(1);

}

return 0;

}