帮忙看一下啊该如何定义和调用delphi里的第三方DLL

帮忙看一下啊，该怎么定义和调用delphi里的第三方DLL
函数：BOOL   IO_GetPageDimension(VOID   *p,   long   *imgwide,   long   *imghigh);
Parameters
p
[in]   Pointer   to   structure   'set_attribute ';
imgwide
[out]   Syscan   scanner   return   accepting   the   scan   width;
imghigh
[out]   Syscan   scanner   return   accepting   the   scan   height;

我定义的：
type
set_attribute = Record
  scan_mode:shortint;
  resolution:smallint;           
  brightness:shortint;           
  contrast:shortint;             
  gamma:shortint;               
  highlight:smallint;            
  shadow:smallint;              
  .......
end;
function IO_GetPageDimension(p: set_attribute; imgwide: Longint; imghigh: Longint):Boolean;stdcall;external 
'A8100.dll';
在窗体中调用：
begin
  p.highlight:= 100;
  p.scan_mode:= 4;
  p.resolution:=300;           
  p.brightness:= 100;           
  p.contrast:= 80;             
  p.gamma:= 80;200;            
  p.shadow:= 200;              
  IO_GetPageDimension(p: set_attribute; imgwide: Longint; imghigh: Longint);
end;
在生成EXE文件时出错，提示：not enough actual parameters。出错的地方在 IO_GetPageDimension(p: set_attribute;imgwide: Longint; imghigh: Longint);的set_attribute上
不知道是我定义错了还是调用出错。有谁知道该怎么定义，怎么调用啊？
[解决办法]
试试：

type 
pset_attribute = ^set_attribute;
set_attribute   =   Record 
    scan_mode:shortint; 
    resolution:smallint;                       
    brightness:shortint;                       
    contrast:shortint;                           
    gamma:shortint;                               
    highlight:smallint;                         

    shadow:smallint;                             
    ....... 
end; 
function   IO_GetPageDimension(p:   pset_attribute;   imgwide:   pinteger;   imghigh:   pinteger):BOOL;stdcall;external   
'A8100.dll '; 

调用：
  IO_GetPageDimension(p,imgwide,imghigh);