KINGSLEY TAGBO

Your DllImport may not be creating an object to start with.
After your DllImport and before you call wGramC.Parse, check if the object is valid :
E.g.
[code language="c#"]
if (wGramC != null)
{
  wGramC.Parse ...
}
else
{
  System.Diagnostics.Debug.WriteLine("null wGramC Object ...");
}[/code]

public static extern int Init(string dict, string knowledge, string constituent_knowledge, string affix);

public static extern string Parse(string input);

public static extern string ParseDiagram(string input);

public static extern void Release();
then i have this weird problem...
 

Line 252: public void menuItem8_Click(object sender, 
System.EventArgs 
e) Line 253: { Line 254: wGramC.Release(); Line 255: 
if (wGramC.Init("4.0.dict","4.0.knowledge",
"4.0.constituent-knowledge","4.0.affix") != 1) 
Line 256: 
System.Diagnostics.Debug.WriteLine("null wGramC Object ...");

[NullReferenceException: Object reference not set to an instance of 
an object.] webParser.wGramC.Release() +0 
webParser.WebForm1.menuItem8_Click(Object sender, EventArgs e) 
in c:inetpubhttp://www.kdkeys.net/object-reference-not-set-to-an-instance-of-an-object/#link-6821:254 
System.Web.UI.WebControls.Button.OnClick(EventArgs e) 
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.
RaisePostBackEvent(String eventArgument) System.Web.UI.Page.
RaisePostBackEvent(IPostBackEventHandler sourceControl, 
String eventArgument) System.Web.UI.Page.RaisePostBackEvent
(NameValueCollection postData) 
System.Web.UI.Page.ProcessRequestMain() 

KINGSLEY TAGBO

GEEZMOH :
Put the Link41a.dll in your System Folder (System32)
Change the calls to Link41a.dll to refer to the full path of the dll e.g. C:WINNTSYSTEM32LINK41A.DLL
Finally please give me a feedback  [H] if it works.
Thanks

I just did what u told me too...But i got the same problem...by the way the wGramC.Init is working why the other like the Parse didn't work...What do u mean by "Change the calls to Link41a.dll to refer to the full path of the dll e.g. C:WINNTSYSTEM32LINK41A.DLL"I will re code the dll??Please be patient with me... Thnx a lot.. please help me...

KINGSLEY TAGBO

Geezmoh :
Leave the dll file in the local bin directory (not system32).
Change the DllImport line to look like :

[DllImport("c:inetpubhttp://www.kdkeys.net/object-reference-not-set-to-an-instance-of-an-object/#link-6975" .....

public static extern void Release();
I got the same problem I think the import is working because I don't have any problem in
 
[DllImport("c:/windows/system32/link41a.dll", EntryPoint="Init", CallingConvention=CallingConvention.StdCall)]

KINGSLEY TAGBO

Can you try replacing all calls to DllImport("CLink41a.dll" to DllImport("c:/windows/system32/link41a.dll" or whatever the ful path to your dll is.See these references : http://www.kdkeys.net/object-reference-not-set-to-an-instance-of-an-object/#link-6977http://www.kdkeys.net/object-reference-not-set-to-an-instance-of-an-object/#link-6978

Kingsley Tagbo
WWHHOOOAAAAAAA

Just fix the problem Thnx man ur great... and thnx to you reference it helps me a lot...

The fix procedure...
In web Application just put the dll in your system32 folder..
I just post the solution for the other that having the same problem...

KINGSLEY TAGBO

Please do one thing for me.Please post the description of your solution and then vote on the thread according to how you feel about this post.Thanks a lot.

KINGSLEY TAGBO

It looks like your object wGramC.Parse is not instantiated.

public static extern string Parse(string input);