1 //1.单元内容 2 unit UnitAlienForm; 3 interface 4 uses 5   Windows, Forms, Classes, Graphics; 6 //从文件加载PNG 7 procedure AlienForm_PNGFromFile(AForm : TForm; AFileName : String); 8 //从资源加载PNG 9 procedure AlienForm_PNGFromResource(AForm : TForm; ResName : String; ResType : PWideChar; Instance : HINST = 0);10 //从图像对象加载11 procedure AlienForm_PNGFromGraphic(AForm : TForm; AGraphic : TGraphic);12 implementation13 procedure AlienForm_PNGFromFile(AForm : TForm; AFileName : String);14 var15   wic : TWICImage;16 begin17   wic := TWICImage.Create;18   wic.LoadFromFile(AFileName);19   AlienForm_PNGFromGraphic(AForm, wic);20   wic.Free;21 end;22 procedure AlienForm_PNGFromResource(AForm : TForm; ResName : String;ResType : PWideChar; Instance : HINST);23 var24   wic : TWICImage;25   r : TResourceStream;26 begin27   if Instance = 0 then28     Instance := HInstance;29   r := TResourceStream.Create(Instance, ResName, ResType);30   wic := TWICImage.Create;31   wic.LoadFromStream(r);32   AlienForm_PNGFromGraphic(AForm, wic);33   wic.Free;34   r.Free;35 end;36 procedure AlienForm_PNGFromGraphic(AForm : TForm; AGraphic : TGraphic);37 var38   ptDst, ptSrc: TPoint;39   Size: TSize;40   BlendFunction: TBlendFunction;41   bmp : TBitmap;42 begin43   bmp := TBitmap.Create;44   bmp.Assign(AGraphic);45   ptDst := Point(AForm.Left, AForm.Top);46   ptSrc := Point(0, 0);47   Size.cx := AGraphic.Width;48   Size.cy := AGraphic.Height;49   BlendFunction.BlendOp := AC_SRC_OVER;50   BlendFunction.BlendFlags := 0;51   BlendFunction.SourceConstantAlpha := $FF; // 透明度52   BlendFunction.AlphaFormat := AC_SRC_ALPHA;53   SetWindowLong(AForm.Handle, GWL_EXSTYLE, GetWindowLong(AForm.Handle,54       GWL_EXSTYLE) or WS_EX_LAYERED);55   UpdateLayeredWindow(AForm.Handle,56      AForm.Canvas.Handle,57      @ptDst,58      @Size,59      bmp.Canvas.Handle,60      @ptSrc,61      0,62      @BlendFunction,63      ULW_ALPHA);64   bmp.Free();65 end;66 end.67 68 //2.调用方法69 procedure TForm2.FormCreate(Sender: TObject);70 begin71   AlienForm_PNGFromFile(Form2, ‘E:\未标题.png‘);72 end;