为窗口绑定C语言

-1

我在Windows（C语言）上使用绑定方法时遇到了麻烦。好。我的代码是应该做以下的事情：为窗口绑定C语言

从用户那里得到2个地址：一个人必须从本地计算机的IP地址和其他远程地址（一个谷歌的地址为例）。
我正在写的应用程序将绑定到本地地址
应用程序将连接到第二个地址。

我从互联网上得到了一些代码。你可以看到我在评论上咨询过的所有资料。

This application will only accepts a string from the client (which specifies the local 
address which the application will bind), then, the app will connect to a remote service 
google, youtube or whatever. The main purpose that this app serves is to know if, when 
binded to a local address, the operative system (in this case Windows Based system) gives priority to: 
- SA/DA rule 
- Forwarding table 




SOURCES: 

http://stackoverflow.com/questions/2065495/using-a-specific-network-interface-for-a-socket-in-windows 
http://stackoverflow.com/questions/2605182/when-binding-a-client-tcp-socket-to-a-specific-local-port-with-winsock-so-reuse 
http://www.delta-search.com/?q=error+on+binding+to+local+address%2Cwindows&s=web&as=0&rlz=0&babsrc=HP_ss 
http://social.msdn.microsoft.com/Forums/zh/vcgeneral/thread/763a00ab-0e7f-44c6-9794-840fc6cb2e07 
http://www.delta-search.com/?q=add+ws2_32.lib+visual+studio+2010&babsrc=HP_ss&s=web&rlz=0&as=3&ac=0%2C331 
http://stackoverflow.com/questions/5220309/why-am-i-getting-linker-errors-for-ws2-32-dll-in-my-c-program 
http://msdn.microsoft.com/en-US/windows/desktop/aa904949 
http://msdn.microsoft.com/en-us/library/windows/desktop/ms737550(v=vs.85).aspx 



#pragma once 
#include <winsock2.h> 
#pragma comment(lib, "ws2_32.lib") 
#include <Ws2tcpip.h> 
#include <stdio.h> 


void Abort(char *msg); 

void main(int argc,char*argv[]){ 

    int ret, fd; 
    struct sockaddr_in sa_dst; 
    struct sockaddr_in sa_loc; 

    if(argc < 3) 
     Abort("Syntax: SourceIpAddress(to bind) DestinationIpAddress(to connect)"); 


    fd = socket(AF_INET, SOCK_STREAM, 0); 

    // Local 
    memset(&sa_loc, 0, sizeof(struct sockaddr_in)); 
    sa_loc.sin_family = AF_INET; 
    sa_loc.sin_port = htons(0); 
    sa_loc.sin_addr.s_addr = inet_addr(argv[1]); 

    if((ret = bind(fd, (struct sockaddr *)&sa_loc, sizeof(struct sockaddr))) < 0) 
     Abort("Binding to local address"); 


    // Remote 
    memset(&sa_dst, 0, sizeof(struct sockaddr_in)); 
    sa_dst.sin_family = AF_INET; 
    sa_dst.sin_port = htons(80); 
    sa_dst.sin_addr.s_addr = inet_addr(argv[2]); // google :) 

    if((ret = connect(fd, (struct sockaddr *)&sa_dst, sizeof(struct sockaddr))) < 0) 
     Abort("Connect to remote address"); 

    printf("\n\nConnection Successfully made!!\n\n"); } 

void Abort(char *msg){ 
fprintf(stderr,"\n\n<ERROR>: <%s>\n",msg); 
perror("\n\nExiting..."); 
exit(EXIT_FAILURE);  }

问题是，bind返回-1。我已经测试过了。

任何人都可以帮助我吗？

在此先感谢

来源

2013-03-01 Pedro Neves

根本不需要本地地址或bind（）。当您连接时，TCP会为您选择一个。 – EJP 2013-03-02 02:26:53

当一个Winsock函数失败，你可以调用WSAGetLastError()找出原因。

在这种情况下，你是不是叫WSAStartup()，所以socket()失败，出现错误WSANOTINITIALISED您所忽略，所以你最终传递一个无效的套接字来bind()。

来源

2013-03-02 02:19:42

为窗口绑定C语言

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