1

在这里，我尝试使用 send() 方法将字符串发送到函数参数并作为套接字中的参数。

user_main.cpp

int main(int argc, char *argv[] )
{
    const char *buffer;
    const char *ch;
    std::string input = argv[2];
    int ar[2];
    printf("Client : \n");
    if ( argc != 2 ) /* argc should be 2 for correct execution */
    {
              printf( "\n%s filename\n", argv[0] );
    }
    else 
    {       
    ch=client(input);
    ar[0]=((int*)ch)[0];
    ar[1]=((int*)ch)[1];

    }

    printf("\n @ar[0]=%d;ar[1]=%d@ \n",ar[0],ar[1]);
    return ar[1];
}

客户端.cpp：

#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <netinet/in.h>
#include <resolv.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <iostream>
#include <vector>
#include <sstream>
#include <algorithm>

#pragma GCC diagnostic ignored "-Wwrite-strings"

int ar[10];
char *client(std::string input_string)
{
    //Process user inserted data. Remove punctuation marks from input_string
    std::replace_if(input_string.begin(), input_string.end(), 
                 std::ptr_fun<int, int>(&std::ispunct), ' ');

    int host_port= 1103;
    char* host_name="127.0.0.1";

    struct sockaddr_in my_addr;
    int bytecount; 
    int buffer_len=0;
    int i=0,x=0;
    int hsock;
    int * p_int;
    int err;
    hsock = socket(AF_INET, SOCK_STREAM, 0);
    if(hsock == -1){
        printf("Error initializing socket %d\n",errno);
        goto FINISH;
    }

    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",errno);
        free(p_int);
        goto FINISH;
    }
    free(p_int);

    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);

    if( connect( hsock, (struct sockaddr*)&my_addr, sizeof(my_addr)) == -1 ){
        if((err = errno) != EINPROGRESS){
            fprintf(stderr, "Error connecting socket %d\n", errno);
            goto FINISH;
        }
    }

    if( (bytecount=send(hsock, input_string.c_str(), input_string.length(),0))== -1){
        fprintf(stderr, "Error sending data %d\n", errno);
        goto FINISH;
    }
    if((bytecount = recv(hsock, ar, sizeof(ar), 0))== -1){
        fprintf(stderr, "Error receiving data %d\n", errno);
        goto FINISH;
    }
     x= sizeof(ar)/sizeof(int);
    printf("x is %d: \n ",x);
    for(i=0; i < (sizeof(ar)/sizeof(*ar));i++)
    {
        std::cout << ar[i] << std::endl;
    }

    close(hsock);

FINISH:
;
//printf("array item2 %d \n",ar[1]);
return (char *)ar;
}

客户端.h

#include <iostream>
#ifndef client_h__
#define client_h__
extern char *client(std::string string_input);

#endif

它编译正确，但是当我运行它时出现错误：

terminate called after throwing an instance of 'std::logic_error'
  what():  basic_string::_S_construct null not valid
Aborted (core dumped)

我看到了这个错误的解决方案：解决方案。但是在这里，我无处使用 const char* 值 NULL 调用 std::string 构造函数。或者我不知道。请让我知道我在哪里犯错。

4

1 回答 1

2

好像 ：

std::string input = argv[2];

应该

std::string input = argv[1];

里面

else { 

}

在main

还，

你应该像这样运行你的程序：（考虑user_main作为你的可执行文件）

user_main HelloWorld

或者

user_main "This is;! string with;'punctuations!"

于 2013-09-07T04:56:05.267 回答