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再学GDI+[99]: TGPImage(19) - 把图像转存为其他格式
2012-06-02 00:00:00   来源:www.bianceng.cn   评论:0 点击:

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本例效果图:

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代码文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls, ExtCtrls;
type
 TForm1 = class(TForm)
  OpenDialog1: TOpenDialog;
  Button1: TButton;
  Button2: TButton;
  procedure FormCreate(Sender: TObject);
  procedure FormDestroy(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure Button1Click(Sender: TObject);
  procedure Button2Click(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI, GDIPUTIL;
const
 OpenFileFilter =
  'GDI+ 全部可以读取的图片格式|*.png;*.jpg;*.gif;*.bmp;*.tif;*.emf;*.wmf;*.ico' +
  '|*.png|*.png' +
  '|*.jpg|*.jpg' +
  '|*.gif|*.gif' +
  '|*.bmp|*.bmp' +
  '|*.tif|*.tif' +
  '|*.emf|*.emf' +
  '|*.wmf|*.wmf' +
  '|*.ico|*.ico';
 ArrExt: array[0..4] of String = ('.png', '.jpg', '.gif', '.bmp', '.tif');
 ArrEncodeName: array[0..4] of String =
  ('image/png', 'image/jpeg', 'image/gif', 'image/bmp', 'image/tiff');
var
 FileName: string;
 img: TGPImage;
procedure TForm1.FormCreate(Sender: TObject);
begin
 img := TGPImage.Create;
 Button1.Caption := '打开';
 Button2.Caption := '保存';
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
 img.Free;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
begin
 if FileName <> '' then
 begin
  g := TGPGraphics.Create(Canvas.Handle);
  g.DrawImage(img, 10, 10, img.GetWidth, img.GetHeight);
  g.Free;
 end;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
 OpenDialog1.Filter := OpenFileFilter;
 if OpenDialog1.Execute then
 begin
  FileName := OpenDialog1.FileName;
  img.Free;
  img := TGPImage.Create(FileName);
  Repaint;
 end;
end;
procedure TForm1.Button2Click(Sender: TObject);
var
 ImgGUID: TGUID;
 i: Integer;
begin
 if FileName = '' then
 begin
  ShowMessage('先要打开文件');
  Exit;
 end;
 {一次性保存为 5 种可能的格式}
 for i := 0 to 4 do
 begin
  GetEncoderClsid(ArrEncodeName[i], ImgGUID); {先获取格式编码}
  img.Save(ChangeFileExt(FileName, ArrExt[i]), ImgGUID);
 end;
 Beep;
end;
end.

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