delphi实现保存和读取图片的方法

if  OpenPictureDialog.Execute thenbegin   img1.Picture.LoadFromFile(OpenPictureDialog.FileName);   btnPicture.Text:=OpenPictureDialog.FileName;end;

varStream:TMemoryStream;Stream := TMemoryStream.Create; // 创建内存流// 将图片保存到内存流中img1.Picture.Graphic.SaveToStream(Stream);ParamByName('picture').LoadFromStream(Stream,ftBlob);ParamByName('IsSavePicture').Value:='1';Stream.Free;  //用完了马上Free掉

varStream:TMemoryStream;Jpg:TjpegImage;if fieldbyname('IsSavePicture').Value='1' thenbegin Stream:=TMemoryStream.Create ; Jpg:=TjpegImage.Create ; TBlobField(FieldByName('picture')).SaveToStream(Stream);  // 显示的转换为BlobField并保存到内存流 Stream.Position :=0; jpg.LoadFromStream(Stream);  // 加载图片 img1.Picture.Assign(Jpg); Stream.Free; Jpg.Free;endelsebegin img1.Picture :=nil;