请问为什么下面代码会出错。VC调用DELPHI DLL.

[snowedforest]

DELPHI：
================================
library DCToJpg;
uses SysUtils, Classes, windows, Graphics, Jpeg;
function add(i:Pinteger;j:Pinteger):integer;stdcall;
begin
result:=i^+j^;
end;
exports
Add name 'Add';
begin
end.




VC调用部分：


typedef long (* _add)(long* a,long* b);

。。。
void CDllCallDlg::OnOK()
{


HINSTANCE hLibrary;
_add add;

hLibrary=LoadLibrary("DCToJpg.dll");
add=(_add)GetProcAddress(hLibrary,"Add");
long i;
long x(1),y(-2);

i= (*add)(&x,&y);
FreeLibrary(hLibrary);
CString s;
s.Format("%d",i);
::AfxMessageBox(s);

CDialog::OnOK();
}

[xxhfortrue]

i= (*add)(&x,&y);

==>
i=add(&x,&y)

[rivershan]

function add(i:Pinteger;j:Pinteger):integer;stdcall;
--------------------------------------------^^^^^^^^

stdcall改掉

[xxhfortrue]

void CDllCallDlg::OnOK()
{


HINSTANCE hLibrary;
_add add;

hLibrary=LoadLibrary("DCToJpg.dll");
if (hLibrary == NULL)
{
error();
}
add=(_add)GetProcAddress(hLibrary,"Add");
if (add == NULL
{
error();
}
long i;
long x(1),y(-2);

i= add(&x,&y);
FreeLibrary(hLibrary);
CString s;
s.Format("%d",i);
::AfxMessageBox(s);

CDialog::OnOK();
}

[rivershan]

改成cdecl