i can possible to call below function from dll and works fine .

DefineDLLFunc: "ConsoleApplication10.dll", int, "getP";

print("sum =",getP());

But

DefineDLLFunc: "ConsoleApplication10.dll", int, "getP",int ,int;

print("sum =",getP(10,12));

ERROR

<<exception>>
Address: 0x65641407 ( 1701057543 )
Code: 0xC0000005 ( -1073741819 )
Continuable: 0x00000000 ( 0 )
Description: Instraction for adress "0x
ErrorCode: 0xC0000005 ( -1073741819 )
ExceptionType: 0x00000000 ( 0 )
Module: C:\Documents and Settings\All Users\Application Data\TS Support\MultiCharts\StudyServer\Studies\Dlls\Indicators\i_my_indicator.dll
Process: C:\Program Files\TS Support\MultiCharts\MultiCharts.exe
Thread ID: 0x000013F4 ( 5108 )
Time: 27.05.2012 - 01:36:02.768


By def file is

LIBRARY DemoLibrary
DESCRIPTION 'Test DLL for file operations
EXPORTS
WriteToFile
getVal
getadd
getP

You can call your function only with *one* signature, function overloading (one function with different signatures) will not work when calling DLL's from "outside". So, you need to decide if your function getP() expects zero parameters (as in your first example) OR two parameters (as in your second example). If you need both calling variants you have to implement two functions with different names.

Post your function declaration ConsoleApplication10::getP()

Peter