Noobie question, gethostbyaddr isn't giving me an output

[Kyan]

I may mess up with pointers and structs a little but, how I'm not getting a proper output? I was expecting to get my lan hostname using this (yes ping to that address gives the hostname)

I'm always getting "0"

$uip = DllCall("wsock32.dll", "long", "inet_addr", "str", "192.168.1.4")[0]
$call = DllCall("wsock32.dll", "long_ptr", "gethostbyaddr", "long_ptr", $uIP, "int", 4, "int", 2)
ConsoleWrite(DllStructGetPtr($call,1)&@LF)
Exit

arrayDisplay ouput:

Row|Col 0
[0]|0x00000000
[1]|67217600
[2]|4
[3]|2

What am I messing up here? 

[JohnOne]

For a start inet_addr returns ulong, not long.

Next, you are passing an array to a param that expects a string.

The list goes on, you should start by doing some error checking after your calls to dll.

[Kyan]

being long or ulong still returns 67217600

I'm passing the [0] value of $uIP array

[JohnOne]

Yes, I see now.

in any case you should pass correct type.

You might get away with it and you might not, but I doubt it when the param you are passing it to expects a string.

You wont know until you check for errors.

[Kyan]

Errors? @error is 0 and long_ptr gethostbyaddr is 0 (no WSA error for 0 https://msdn.microsoft.com/en-us/library/windows/desktop/ms738521%28v=vs.85%29.aspx) 

[JohnOne]

Would it be too much trouble for you to post all the code you are trying?

[Kyan]

that's all the code to get the other lan computer name, I'm also trying with WMI using System.Net.Dns.GetHostEntry() but I don't know how to create an object for System class

[JohnOne]

Still no error checking then?

[Kyan]

This is the updated code, still outputing the 0

Local $uip = DllCall("wsock32.dll", "ulong", "inet_addr", "str", "192.168.1.4")[0]
$call = DllCall("wsock32.dll", "ptr", "gethostbyaddr", "ptr", $uIP, "int", 4, "int", 2)
ConsoleWrite(DllStructGetPtr($call,1)&@LF)
Exit

[JohnOne]

Still no error checking then?

[BrewManNH]

You should look in the Inet.au3 file for the function _TCPIPToName function to see how it is done in there.

[Kyan]

 wow nice, tried on my local ip (since is the only one active now) and got @ERROR = 4, @Extended = 10093 = WSANOTINITIALISED
 


I don't know what to do now 

DllCall($hDll_Ws2_32, "ptr", "gethostbyaddr", "ptr*", $vBinIP, "int", 4, "int", $iAF_INET) returned 0 (what was happening), and then called WSAGetLastError to get the error, should I call 

WSAStartup before running gethostbyaddr? 

EDIT: If WSAStartup is really necessary, I don't know how should I create this struct WSADATA, and how do I put the wsock32 versions in a byte

I know that LByte is the first 4bits (right?)

HByte is the last 4bits, but if the version is 2.2 how do I put it in bits? :s bits are 0 or 1 

Edited April 7, 2015 by Kyan

[BrewManNH]

If you look at the help file entry for _TCPIPToName, you'll see that you need to use TCPStartUp() before you can use the TCP functions, so I'm assuming you'd need to do that with your DLLCall as well.

[Kyan]

Indeed, works only took 26ms to fetch the other host name