Question

你好我试着用参数打开socket（你知道argv和argc）但是由于某种原因，程序显示错误WSAStratup @ 8和类似的东西。我认为问题与论据的收入有关。

如果你能看到并帮助我理解为什么会发生这种情况，我会很高兴。

我的代码 -

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock2.h>
#include <windows.h>

int main(int argc,char *argv[])
{
WSADATA info;
int err, s, cResult;
char ch[10] = "";
char cl[10] = "";

strcpy(ch, argv[3]);



err = WSAStartup(MAKEWORD(2, 0), &info);
if (err != 0)
{
 printf("WSAtartup faild\n");
 return(1);
}

s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (s == INVALID_SOCKET)
{
 printf("Error creating = %d\n", WSAGetLastError());
}
else
{
 printf("socket function succeeded\n");
}

SOCKADDR_IN clientService;
clientService.sin_family = AF_INET;
clientService.sin_addr.s_addr = inet_addr(argv[1]);
clientService.sin_port = htons(atoi(argv[2]));

cResult = connect(s, (struct sockaddr *) &clientService, sizeof (clientService));
if (cResult == SOCKET_ERROR)
{
 printf("connect failed error: %ld\n", WSAGetLastError());
}

send(s, ch, 10, 0);
recv(s, cl, 10, 0);

puts(ch);
puts(cl);
if (strcmp(ch, cl) == 0)
{
 printf(" Same\n");
}
else
{
 printf("Not same\n");
}


cResult = closesocket(s);
if (cResult == SOCKET_ERROR)
{
 printf("closesocket function failed error %ld\n", WSAGetLastError());
 WSACleanup();
 return 1;
}

system("PAUSE");
}

Answer 1

从您的问题不清楚什么是失败，但要正确初始化Winsock 2支持的功能，您想要调用

WSAStartup(WINSOCK_VERSION, &wsadata);

在Winsock2.h中将WINSOCK_VERSION定义为：

#define WINSOCK_VERSION MAKEWORD(2,2)

您还需要与ws2_32.lib链接以使用Winsock 2函数（Winsock 1.1非常老 - 该版本从wsock32.lib导出）。

Answer 2

我在我的Visual Studio中运行了你的程序，运行正常。您应该考虑以下几点：在调用程序时，您应该指定IP，端口号和一些测试消息。

myprogram 127.0.0.1 1024 "test message"

此外，如果执行或出错，则应检查每个套接字命令，如send()和recv()。查看修改后的程序。最后，您应该将您的程序与wsock32.lib库链接起来。转到项目属性并将此库添加到链接器页面中的其他依赖项，具体取决于您的语言，我有西班牙语，它说“ Dependencias adicionales ”也许你的Visual Studio会说些不同的东西。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock2.h>
#include <windows.h>

int main(int argc,char *argv[])
{
    WSADATA info;
    int err, s, cResult;
    char ch[10] = "";
    char cl[10] = "";

    // Check that the appropiate arguments has been given
    if (argc < 4) return -1;

    // Copy up the size of ch
    strncpy(ch, argv[3], sizeof(ch));

    err = WSAStartup(MAKEWORD(2, 0), &info);
    if (err != 0)
    {
        printf("WSAtartup failed: %ld\n", WSAGetLastError());
        system("PAUSE");
        return -1;
    }

    s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (s == INVALID_SOCKET)
    {
        printf("Error creating = %ld\n", WSAGetLastError());
        system("PAUSE");
        return -1;
    }
    else
    {
        printf("socket function succeeded\n");
    }

    SOCKADDR_IN clientService;
    clientService.sin_family = AF_INET;
    clientService.sin_addr.s_addr = inet_addr(argv[1]);
    clientService.sin_port = htons(atoi(argv[2]));

    cResult = connect(s, (struct sockaddr *) &clientService, sizeof (clientService));
    if (cResult == SOCKET_ERROR)
    {
        printf("connect failed error: %ld\n", WSAGetLastError());
        system("PAUSE");
        return -1;
    }

    if (send(s, ch, 10, 0) > 0)
    {
        puts(ch);
        if (recv(s, cl, 10, 0) > 0)
        {
            puts(cl);
            if (strcmp(ch, cl) == 0)
            {
                printf(" Same\n");
            }
            else
            {
                printf("Not same\n");
            }
        }
        else
        {
            printf("error in recv() %ld\n", WSAGetLastError());
        }
    }
    else
    {
        printf("error in send() %ld\n", WSAGetLastError());
    }

    cResult = closesocket(s);
    if (cResult == SOCKET_ERROR)
    {
        printf("closesocket function failed error %ld\n", WSAGetLastError());
    }
    WSACleanup();
    system("pause");
    return 0;
}

打开带参数的套接字

2 个答案: