高分请教各位DELPHI高手:如何用DBImage控件来保存图片到SQL表的字段中,如何显示出来? DELPHI中如何实现将照片直接放入SQL表的字段中?给个例子 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 表的字段,是建IMAGE的字段类型吗? unit Unit1; interface usesWindows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,ExtCtrls, DBCtrls, Grids, DBGrids, Db, ADODB,jpeg, StdCtrls,dbtables;{一定要USES JPEG单元,使能存储JPG文件格式}typeTForm1 = class(TForm)DataSource1: TDataSource;ADOQuery1: TADOQuery;DBGrid1: TDBGrid;DBNavigator1: TDBNavigator;Image1: TImage;savebutton: TButton;showbutton: TButton;OpenDialog1: TOpenDialog;ADOQuery1id: TIntegerField;ADOQuery1pic: TBlobField;procedure savebuttonClick(Sender: TObject);procedure showbuttonClick(Sender: TObject);procedure DBNavigator1Click(Sender: TObject; Button: TNavigateBtn);private{ Private declarations }public{ Public declarations }end;varForm1: TForm1;implementation{$R *.DFM}function JpegStartsInBlob(PicField:TBlobField):integer;varghy: TADOBlobstream;buffer:Word;hx: string;beginResult := -1;ghy := TADOBlobstream.Create(PicField, bmRead);trywhile (Result = -1) and (ghy.Position + 1 < ghy.Size) dobeginghy.ReadBuffer(buffer, 1);hx:=IntToHex(buffer, 2);if hx = 'FF' then beginghy.ReadBuffer(buffer, 1);hx:=IntToHex(buffer, 2);if hx = 'D8' then Result := ghy.Position - 2else if hx = 'FF' thenghy.Position := ghy.Position-1;end; //ifend; //whilefinallyghy.Freeend; //tryend;procedure TForm1.savebuttonClick(Sender: TObject);varpicstream:tadoblobstream;beginadoquery1.edit;picstream:=tadoblobstream.Create(tblobfield(adoquery1.fields[1]),bmWrite);if form1.opendialog1.execute thenbeginpicstream.LoadFromFile(opendialog1.filename);picstream.Position:=0;adoquery1.edit;tblobfield(adoquery1.Fields[1]).loadfromstream(picstream);adoquery1.post;end;end;procedure TForm1.showbuttonClick(Sender: TObject);varghy:TADOBlobstream;pic:tjpegimage;beginghy := TADOBlobstream.Create(Adoquery1pic, bmRead);tryghy.Seek(JpegStartsInBlob(Adoquery1pic),soFromBeginning);Pic:=TJpegImage.Create;tryPic.LoadFromStream(ghy);Image1.Picture.Graphic:=Pic;finallyPic.Free;end;finallyghy.Freeend;end;procedure TForm1.DBNavigator1Click(Sender: TObject; Button: TNavigateBtn);beginif button in [nbFirst, nbPrior, nbNext, nbLast] then showbutton.Click;end;end.如果数据库中要存储的是BMP文件,则在procedure TForm1.showbuttonClick(Sender: TObject);过程中代码更改如下即可存储显示BMP文件格式的操作。procedure TForm1.showbuttonClick(Sender: TObject);varghy:TADOBlobstream;pic:tbitmap;beginghy := TADOBlobstream.Create(Adoquery1pic, bmRead);try{ ghy.Seek(JpegStartsInBlob(Adoquery1pic),soFromBeginning);}Pic:=Tbitmap.Create;tryPic.LoadFromStream(ghy);Image1.Picture.Graphic:=Pic;finallyPic.Free;end;finallyghy.Freeend;end; 到此用DELPHI存取JPEG文件到SQL Server数据库中的具体操作已经叙述完毕。 佩服 ghyghost我来学习学习 ClientDataSet1.FieldByName('pic').Assign(image1.Picture.Graphic); 谢谢各位的回复,特别是ghyghost(爱国人士), 寻求用web形式浏览医学dicom文件的delphi编程代码 用delphi7获得本机在断网状态下网卡的mac地址 或硬盘的物理系列号 请大师解决DBGridEh底部汇总时出现错误的问题,多谢! 一个初级问题想请教 100分紧急求助:IdTCPServer接收数据问题。 如何使用第三方控件? 在没有网卡的情况下如何启动Socket服务? 我以前的贴子哪去了? 关于delphi 网络传输文件片段代码 是D版原因吗? 请版主帮个忙把这个贴子置顶:珠海市程序聚会! 简繁转换
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
ExtCtrls, DBCtrls, Grids, DBGrids, Db, ADODB,jpeg, StdCtrls,dbtables;
{一定要USES JPEG单元,使能存储JPG文件格式}
type
TForm1 = class(TForm)
DataSource1: TDataSource;
ADOQuery1: TADOQuery;
DBGrid1: TDBGrid;
DBNavigator1: TDBNavigator;
Image1: TImage;
savebutton: TButton;
showbutton: TButton;
OpenDialog1: TOpenDialog;
ADOQuery1id: TIntegerField;
ADOQuery1pic: TBlobField;
procedure savebuttonClick(Sender: TObject);
procedure showbuttonClick(Sender: TObject);
procedure DBNavigator1Click(Sender: TObject; Button: TNavigateBtn);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;implementation{$R *.DFM}function JpegStartsInBlob(PicField:TBlobField):integer;
var
ghy: TADOBlobstream;
buffer:Word;
hx: string;
begin
Result := -1;
ghy := TADOBlobstream.Create(PicField, bmRead);
try
while (Result = -1) and (ghy.Position + 1 < ghy.Size) do
begin
ghy.ReadBuffer(buffer, 1);
hx:=IntToHex(buffer, 2);
if hx = 'FF' then begin
ghy.ReadBuffer(buffer, 1);
hx:=IntToHex(buffer, 2);
if hx = 'D8' then Result := ghy.Position - 2
else if hx = 'FF' then
ghy.Position := ghy.Position-1;
end; //if
end; //while
finally
ghy.Free
end; //try
end;
procedure TForm1.savebuttonClick(Sender: TObject);
var
picstream:tadoblobstream;
begin
adoquery1.edit;
picstream:=tadoblobstream.Create(tblobfield(adoquery1.fields[1]),bmWrite);
if form1.opendialog1.execute then
begin
picstream.LoadFromFile(opendialog1.filename);
picstream.Position:=0;
adoquery1.edit;
tblobfield(adoquery1.Fields[1]).loadfromstream(picstream);
adoquery1.post;
end;
end;procedure TForm1.showbuttonClick(Sender: TObject);
var
ghy:TADOBlobstream;
pic:tjpegimage;
begin
ghy := TADOBlobstream.Create(Adoquery1pic, bmRead);
try
ghy.Seek(JpegStartsInBlob(Adoquery1pic),soFromBeginning);
Pic:=TJpegImage.Create;
try
Pic.LoadFromStream(ghy);
Image1.Picture.Graphic:=Pic;
finally
Pic.Free;
end;
finally
ghy.Free
end;
end;procedure TForm1.DBNavigator1Click(Sender: TObject; Button: TNavigateBtn);
begin
if button in [nbFirst, nbPrior, nbNext, nbLast] then showbutton.Click;
end;end.如果数据库中要存储的是BMP文件,则在procedure TForm1.showbuttonClick(Sender: TObject);过程中代码更改如下即可存储显示BMP文件格式的操作。
procedure TForm1.showbuttonClick(Sender: TObject);
var
ghy:TADOBlobstream;
pic:tbitmap;
begin
ghy := TADOBlobstream.Create(Adoquery1pic, bmRead);
try
{ ghy.Seek(JpegStartsInBlob(Adoquery1pic),soFromBeginning);}
Pic:=Tbitmap.Create;
try
Pic.LoadFromStream(ghy);
Image1.Picture.Graphic:=Pic;
finally
Pic.Free;
end;
finally
ghy.Free
end;
end;
到此用DELPHI存取JPEG文件到SQL Server数据库中的具体操作已经叙述完毕。
我来学习学习