Hostent problem

ruby-talk
1

Hi,
I want to get the IP address of my machine in my program and for that i
have written the following code.
I don't know why the gethostbyname() is not returning the correct
hostent structure.

hp = new hostent[];
TCHAR str[MAX_COMPUTERNAME_LENGTH+1];
TCHAR result[MAX_COMPUTERNAME_LENGTH+1];

GetComputerName(str,&len);
hp = gethostbyname(str);
if(hp!=NULL)
{
     memcpy(result, hp->h_name, sizeof(result));
                OR
     result=(TCHAR*)hp->h_name;
}

The result that i am getting the hp=NULL.

Thanks,
Saurabh Aggrawal

2

<games60@hotmail.com> wrote in message
news:1120131331.929300.236040@f14g2000cwb.googlegroups.com...

Hi,
I want to get the IP address of my machine in my program and for that

i

have written the following code.
I don't know why the gethostbyname() is not returning the correct
hostent structure.

hp = new hostent;

I think this shouldn't compile, and MinGW agrees. You can't omit the
size of an array allocated using new. You don't want to allocate it
anyway. You just want a pointer:

hostent* hp;

···

TCHAR str[MAX_COMPUTERNAME_LENGTH+1];
TCHAR result[MAX_COMPUTERNAME_LENGTH+1];

GetComputerName(str,&len);
hp = gethostbyname(str);
if(hp!=NULL)
{
     memcpy(result, hp->h_name, sizeof(result));
                OR
     result=(TCHAR*)hp->h_name;
}

The result that i am getting the hp=NULL.

3

Hi,

Now the code is:

hostent* hp;
TCHAR result[MAX_COMPUTERNAME_LENGTH­+1];

hp = gethostbyname("localhost");
if(hp!=NULL)
{
     result=(TCHAR*)hp->h_name;
}

I am still getting the same output. hp=NULL.