Delphi自动适应屏幕大小

Delphi自动适应屏幕大小
//自动适应屏幕大小：作者：海宏软件，周承昊。
function autoFitScreen640_480(oContainer:TWinControl):Boolean;
const defaultScreenWidth=800;   defaultScreenHeight=600;
var i,j:integer;      n:double;   v:Variant;
    cmt:TComponent;   obj:TObject;   
    ppi:pPropInfo;    fnt:TFont;
begin
    result:=false;
    //分辨率自适应
    if (screen.width < defaultScreenWidth) then with oContainer do begin
        height:=longint(height) * longint(screen.height) DIV defaultScreenHeight;
        width := longint(width) * longint(screen.width) DIV defaultScreenWidth;
        scaleBy(screen.width, defaultScreenWidth);
        //缩放字体，属性设置部分参考：http://topic.csdn.net/t/20030423/20/1699661.html
        n:=(screen.Width / defaultScreenWidth);
        for i:=ComponentCount-1 downto 0 do begin
          cmt:=components[i];
          with cmt do begin
            ppi:=GetPropInfo(cmt, 'font');          //ClassInfo取对象的属性值
            //有此属性    PropInfo^.PropType^.Kind   =   tkClass
            if (ppi<>nil) and (ppi^.PropType^.Kind=tkClass) then begin
              obj:=GetObjectProp(cmt, 'font');      //获取对象的属性对象
              if (not assigned(obj)) then continue;
              fnt:=obj as TFont;                    //取得字体
              //计算出新的字体
              j:=trunc( (fnt.size * screen.Width) / defaultScreenWidth);
              if j<7 then j:=9 else if j<8 then j:=9;
              //设置字体font.size := j;
              fnt.Size:=j;
              SetObjectProp(cmt, 'font', fnt);
            end;
          end;
        end;
    end;
end;