问题来源: http://www.cnblogs.com/del/archive/2009/05/28/1491186.html#1801853
准备工作:
1、在空白窗体上添加: ClientDataSet1、Button1
2、激活窗体的 OnCreate 事件、激活 Button1 的 OnClick 事件
实现代码:
unit Unit1;interfaceusesWindows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,Dialogs, StdCtrls, DB, DBClient;typeTForm1 = class(TForm)ClientDataSet1: TClientDataSet;Button1: TButton;procedure FormCreate(Sender: TObject);procedure Button1Click(Sender: TObject);end;varForm1: TForm1;implementation{$R *.dfm}constPicPath1 = 'c:\temp\test1.bmp'; {保证测试图片的存在}PicPath2 = 'c:\temp\test2.bmp';{建立数据表并载入数据}
procedure TForm1.FormCreate(Sender: TObject);
begin{建表}with ClientDataSet1 do beginFieldDefs.Add('Name', ftWideString, 8);FieldDefs.Add('Age', ftInteger);FieldDefs.Add('Picture', ftGraphic);CreateDataSet;end;{添加第一条数据}ClientDataSet1.Append;ClientDataSet1['Name'] := '张三';ClientDataSet1['Age'] := 66;TGraphicField(ClientDataSet1.FieldByName('Picture')).LoadFromFile(PicPath1);{添加第二条数据}ClientDataSet1.Append;ClientDataSet1['Name'] := '李四';ClientDataSet1['Age'] := 16;TGraphicField(ClientDataSet1.FieldByName('Picture')).LoadFromFile(PicPath2);
end;{读出指定记录中的图片数据}
procedure TForm1.Button1Click(Sender: TObject);
varBlobStream: TClientBlobStream;GraphicField: TGraphicField;Bitmap: TBitmap;
begin{查找姓名是李四的记录}if ClientDataSet1.Locate('Name', '李四', []) then //可以把其中的李四换成张三试试begin{读取其 Picture 字段}GraphicField := ClientDataSet1.FieldByName('Picture') as TGraphicField;{读入到 Blob 流}BlobStream := TClientBlobStream.Create(GraphicField, bmRead);{给一个 TBitmap 流是为了看看}Bitmap := TBitmap.Create;Bitmap.LoadFromStream(BlobStream);Canvas.Draw(10, 10, Bitmap);Bitmap.Free;//BlobStream.Free;end;
end;end.
（转）)
