how to call a dll function (the function output parameters by reference)

[fxtfxt2008]

I'm so sorry that my english is very bad! I want to call a dll function,but I can not make it work.
struct{
Boolean bAdminPrivilege
}admstru
struct{
String lstrUserName
}userstru
var myDll=getAdditionalFile("test.dll")
dllimport myDll cdecl Boolean GetUserNameAndType(String,Boolean) as checkuser
//trace(Dll.registerFunction(getAdditionalFile("test .dll"),"GetUserNameAndType",))
var admstruct=new Struct(admstru)
var userstruct=new Struct(userstru)
trace(admstruct)
var obj1=new Object()
var obj2=new Object()
obj1.value=admstruct
obj2.value=userstruct
trace(checkuser(obj2,obj1))//return undefined
Please tell me what am I doing wrong!If you have a better way,please give me a complete section

[SWFKit]

Why do you use structures? It seems to be unnecessary.

var myDll=getAdditionalFile("test.dll");
dllimport myDll cdecl Boolean GetUserNameAndType(String,Boolean) as checkuser;
//trace(Dll.registerFunction(getAdditionalFile("test.dll"),"GetUserNameAndType",))

var obj1=new Object()
var obj2=new Object()
obj1.value=new StringStream;
obj1.value.length = 260;
obj2.value=false;
trace(checkuser(obj1,obj2));
trace(obj1.value);
trace(obj2.value);

[fxtfxt2008]

thank you very much for the timely answer! I wish you good luck!!
but the code is still con not run properly ,when the test ,pop-up show:SWFkit Player Pro for applications has encountered a problem
and needs to close. where is the wrong code?

help me!!

[fxtfxt2008]

var myDll=getAdditionalFile("test.dll");
dllimport myDll cdecl Boolean GetUserNameAndType(long*,Boolean*) as checkuser;
var obj1=new Object()
var obj2=new Object()
obj1.value=100;
obj2.value=false;
trace(checkuser(obj1,obj2))
var point1=obj1.value
trace(Dll.getPointerValue(point1, 260))
trace(obj2.value);
//this should be normal operation

Thank you again SWFKIT!!!