和在 Net 中不同的是, 在具體指定圖像格式時, 這裡常常需要的不是格式名稱, 而是格式的 GUID;
知道了格式名稱, 用 GetEncoderClsid 函數可以獲取格式的 GUID;
GetEncoderClsid 函數來自 GDIPUTIL 單元, 本例並沒有用到前面一直不可或缺的 GDIPOBJ、GDIPAPI 單元.
如果要獲取 image/bmp、image/jpeg、image/gif、image/tiff、image/png 格式以外的 GUID 不能使用此函數.
另外, 為了把 GUID 轉換為字符串顯示, 本例用到了 GUIDToString 函數.
本例效果圖:
代碼文件:unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Memo1: TMemo;
procedure FormCreate(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPUTIL;
procedure TForm1.FormCreate(Sender: TObject);
var
List: TStringList;
ImgGUID: TGUID;
i: Integer;
begin
List := TStringList.Create;
List.Add('image/bmp');
List.Add('image/jpeg');
List.Add('image/gif');
List.Add('image/tiff');
List.Add('image/png');
Memo1.Clear;
for i := 0 to List.Count - 1 do
begin
GetEncoderClsid(List[i], ImgGUID);
Memo1.Lines.Add(Format('%s: %s', [GUIDToString(ImgGUID), List[i]]));
end;
List.Free;
end;
end.
窗體文件:object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClientHeight = 115
ClientWidth = 329
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'Tahoma'
Font.Style = []
OldCreateOrder = False
OnCreate = FormCreate
PixelsPerInch = 96
TextHeight = 13
object Memo1: TMemo
Left = 0
Top = 0
Width = 321
Height = 115
Align = alLeft
Lines.Strings = (
'Memo1')
ScrollBars = ssBoth
TabOrder = 0
ExplicitHeight = 128
end
end
