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再学GDI+[103]: TGPImage(23) - 提取 GIF 动画的每一帧
2012-06-04 00:00:00   来源:www.bianceng.cn   评论:0 点击:

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本例效果图:

\

代码文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls;
type
 TForm1 = class(TForm)
  Button1: TButton;
  ListBox1: TListBox;
  OpenDialog1: TOpenDialog;
  procedure FormCreate(Sender: TObject);
  procedure FormDestroy(Sender: TObject);
  procedure Button1Click(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure ListBox1Click(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
var
 img: TGPImage;
 GifFrame, GifFrameCount: Word;
procedure TForm1.FormCreate(Sender: TObject);
begin
 OpenDialog1.Filter := 'GIF 文件|*.gif';
 img := TGPImage.Create;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
 img.Free;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
 DimensionsCount: Integer;
 DimensionsIDs: PGUID;
 i: Integer;
type
 ArrDimensions = array of TGUID;
begin
 if not OpenDialog1.Execute then Exit;
 img.Free;
 img := TGPImage.Create(OpenDialog1.FileName);
 {获取 Gif 总帧数}
 DimensionsCount := img.GetFrameDimensionsCount;
 GetMem(DimensionsIDs, DimensionsCount * SizeOf(TGUID));
 img.GetFrameDimensionsList(DimensionsIDs, DimensionsCount);
 GifFrameCount := img.GetFrameCount(ArrDimensions(DimensionsIDs)[0]);
 FreeMem(DimensionsIDs);
 Text := Format('共有 %d 帧', [GifFrameCount]);
 {显示帧列表}
 ListBox1.Clear;
 for i := 1 to GifFrameCount do
  ListBox1.Items.Add(Format('第 %d 帧', [i]));
 Repaint;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 g.DrawImage(img, ListBox1.Width + 10, 10, img.GetWidth, img.GetHeight);
 g.Free;
end;
procedure TForm1.ListBox1Click(Sender: TObject);
begin
 GifFrame := ListBox1.ItemIndex;
 img.SelectActiveFrame(FrameDimensionTime, GifFrame);
 Repaint;
end;
end.

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