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delphi TGPImage - 提取 GIF 动画的每一帧

作者:admin 来源:未知 日期:2010/5/3 22:18:04 人气: 标签:



代码文件:


unit Unit1;interfaceuses  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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