Delphi7中DLL文件的加载

最好把DLL文件放到Delphi安装目录下Lib或Imports下
1.Tool菜单下Library标签——>LibraryPathxx下，浏览找到DLL文件所在在文件夹(GDI+为例)，
——>add,GUI+这个路径回显示到上面的对话框中，确定安装OK！
特别声明：GDI下的包不只是DLL文件还有一些GDIPAPI.dcu、GDIPAPI.das、GDIPOBJ.pas、
GDIPOBJ.dcu、GDIPUTIL.pas、DirectDraw.pas.DirectX.inc、Jedi.inc、DerectDraw.dcu
画圆就可以了：
unit Unit1;
interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;
type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
var
  Form1: TForm1;
implementation
uses GDIPAPI,GDIPOBJ;
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
var
  g: TGPGraphics;
  p: TGPPen;
begin
  g := TGPGraphics.Create(Canvas.Handle);
  p := TGPPen.Create(aclRed, 2);
  {参数1颜色; 参数2是笔宽, 笔宽是可选, 默认 1}
  g.DrawEllipse(p, 11, 11, 222, 111);
  p.Free;
  g.Free;
end;
end.