菜鸟提问，为什么socket()总是返回INVALID_SOCKET，谢谢指教

[decade]

#include "winsock2.h"
#include "stdlib.h"
#include "string.h"
#pragma comment (lib,"wsock32.lib")
#pragma comment (lib,"ws2_32.lib")

SOCKET listensocket;//定义为全局变量

if((listensocket=socket(AF_INET,SOCK_DGRAM,0))==INVALID_SOCKET ) {
AfxMessageBox("socket()调用失败");

}

每次运行都提示失败，不知道为什么。谢谢各位大侠指教。

[GeorgeHunter]

是不是没调用SWAStartUp？？用WSAGetLastError()取错误码发出来看看。

[decade]

up

[decade]

谢谢，确实是没调用WSAStartup,但是新问题又出现了，

sockaddr_in local;

local.sin_family=AF_INET;
local.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
local.sin_port=8000;

if(bind(listensocket,(struct sockaddr *)&local,sizeof(local)==SOCKET_ERROR))
{
AfxMessageBox("bind()调用失败");
}

运行提示失败，谢谢指教

[decade]

if(bind(listensocket,(struct sockaddr *)&local,sizeof(local)==SOCKET_ERROR))
{
AfxMessageBox("bind()调用失败");
TRACE("error is %d,",GetLastError());
}

TRACE()输出0

[huangbeyond]

SOCKADDR_IN local;//修改
local.sin_family=AF_INET;
local.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
local.sin_port=htons(8000);//修改
if(bind(listensocket,(struct sockaddr *)&local,sizeof(local)==SOCKET_ERROR))
{
AfxMessageBox("bind()调用失败");
TRACE("error is %d,",WSASetLastError());//修改


}


先这样试试,看行不行.

[elssann]

saddr.sin_family = AF_INET;
saddr.sin_addr.s_addr = inet_addr("192.168.10.52");
saddr.sin_port = htons(9009);
if((s=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==SOCKET_ERROR)
{
printf("error!socket failed!\n");
return ;
}

if(bind(s,(SOCKADDR *)&saddr,sizeof(saddr))==SOCKET_ERROR)
{
ret=GetLastError();
printf("error!bind failed!\n");
return ;
}

[elssann]

local.sin_addr.S_un.S_addr = htonl(INADDR_ANY);

改为saddr.sin_addr.s_addr = htonl(INADDR_ANY);

[decade]

还是不行啊，总提示失败，郁闷ing~~~~~~!