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unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, ExtCtrls, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
Image1: TImage;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
// JXSF_PIC_Format_Convert
// 图片格式转换
// [in] pic_stream 原图片的数据流
// [in] toPicForMat 要转换的图片格式
// 0 1 2 3 4 5
// Bmp, Png, Jpeg, Gif, Tiff WMPhoto
// [out] targ_stream
// 转换后的数据流
// 返回:
// 转换是否成功
// 0 = 失败
// 1 = 成功
function JXSF_PIC_Format_Convert (
const pic_stream :TMemoryStream;
const toPicForMat : INT32;
const targ_stream : TMemoryStream
) : INT32;
var wi:TWICImage;
var flag : INT32;
begin
if not ( toPicForMat in [0..5] ) then
begin
try
targ_stream.Clear;
except
end;
Result:=0;exit;
end;
wi:=TWICImage.Create;
try
pic_stream.Position:=0;
targ_stream.Clear;
// 下面是格式转换核心代码
wi.LoadFromStream(pic_stream);
wi.ImageFormat := TWICImageFormat( toPicForMat);
wi.SaveToStream( targ_stream);
targ_stream.Position:=0;
flag:=1;
except
flag:=0;
end;
wi.Free;
Result:=flag;
end;
procedure TForm1.Button1Click(Sender: TObject);
var sm1,sm2:TMemoryStream;
var wi:TWICImage;
begin
sm1:= TMemoryStream.Create;
sm2:= TMemoryStream.Create;
sm1.LoadFromFile( 'c:\tt\0002.jpg');
sm1.Position :=0;
JXSF_PIC_Format_Convert( sm1,0,sm2) ;
wi:=TWICImage.Create;
wi.LoadFromStream(sm2);
Image1.Picture.Assign( wi);
wi.Free;
sm1.Free;
sm2.Free;
end;
end.
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