怎样将jepg格式的图片加入数据库? 我用opendialog将图片打开并显示在了dbimage上,我想将这一图片保存到表table中的photo字段中,请问该怎么操作?请高手教我!!!在线等待!! 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 我是把路静啊。显示图片 需要 uses jpeg; if FileExt='.JPG' then begin try ImgShow.Picture.LoadFromFile(ShellListView1.selectedfolder.PathName); except on ElnvalidGraphic do ImgShow.Picture.Graphic:=nil; end; SetJPEGOptions(self); end; )存储jpg图片procedure TMainForm.btnYesClick(Sender: TObject);var MyJPEG: TJPEGImage; MS: TMemoryStream;begin MyJpeg := TJpegImage.Create; try MyJpeg.Assign(image1.Picture.Graphic) Ms := TMeMoryStream.Create; MyJpeg.SaveToStream(Ms); Ms.Position := 0; adoqrytest.Edit; adoqrytest['id'] := '1'; TBlobField(adoqrytest.FieldByName('picture')).LoadFromStream(MS); adoqrytest.Post; finally MyJpeg.Free; Ms.Free; end;end;2)读取jpg图片procedure TMainForm.FormShow(Sender: TObject);var tempStream: TStringStream; tempJpeg: TJpegImage;begin try tempStream := TStringStream.Create(''); TBlobField(adoqrytest.FieldByName('picture')).SaveToStream(tempStream); tempJpeg := TJpegImage.Create; tempJpeg.LoadFromStream(tempStream); tempstream.position:=0 DBImage1.Picture.Bitmap.Assign(tempJpeg);//到这里错误提示'jpeg error #41' finally tempStream.Free; tempJpeg.Free; end;end; TMemoryStream在uses单元中应该加入什么类啊?jpegimage是jpeg吗? WWWWA(aaaa) ( 我试了以下执行的时候说是'bitmap is valivd'是怎么回事啊??? 存入var v_a:TJPEGImage;begin v_a:=tjpegimage.Create; v_a.LoadFromFile('d:\rsc\mailtp3.jpg'); table1.edit; table1.fieldbyname('zp').assign(v_a); table1.post; //TABLE1.MoveBy(2);end;读取var tempStream: TStringStream; tempJpeg: TJpegImage;begin try tempStream := TStringStream.Create(''); TBlobField(TABLE1.FieldByName('ZP')).SaveToStream(tempStream); tempJpeg := TJpegImage.Create; tempstream.position:=0; tempJpeg.LoadFromStream(tempStream); DBImage1.Picture.Bitmap.Assign(tempJpeg);// tempstream.position:=0; finally tempStream.Free; tempJpeg.Free; end;end; WWWWA(aaaa) 他在读取时始终要报错'jpeg error #41'是怎么回事,请指教!!! 你的数据库里那个字段设置的对不对呢?Sql server还是oracle呢? 在oracle中,字段Photo为Blob类型的 是啊,没错,不过每次存的时候都报错'bitmap image is valivd',我真的是那它没办法了 DELPHI存取JPEG文件到SQL Server数据库 高红岩(ghyghost)近日笔者书写一个小型的学生管理系统时,需要用到ADO控件存取SQL Server数据库图片,查看资料发现基本都是针对BMP文件进行操作(巨增数据库大小),但发现了★eagletian★高手翻译的ADO英文技术文档,里面涉及到了数据库存取JPEG文件的关键技术,在win98+sql server桌面版中测试通过,运行良好,现于源码公开如下:unit Unit1;interfaceuses 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);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);try ghy.Seek(JpegStartsInBlob(Adoquery1pic),soFromBeginning); Pic:=TJpegImage.Create; try Pic.LoadFromStream(ghy); Image1.Picture.Graphic:=Pic; finally Pic.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; try Pic.LoadFromStream(ghy); Image1.Picture.Graphic:=Pic; finally Pic.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。 给你提供一个例子:http://218.56.11.178:8020/web/index.aspx-》下载基地-》例程-数据库/报表-》数据库图片存储 关于继承 如何将当前操作者的信息显示在指定的窗口上。 请问哪里有SQL命令资料下载?万分感谢!! 如何一次删除TClientDataSet控件中的所有记录? 如何在TDBgrid中显示我想要的数据 在线等啊! Delphi7里sampl中的TGauge(看起来像做进度条的)怎么用的? 请问怎样判断一个字符串中有相同的字符 急。高手请进! 怎么用一个按钮实现连接,断开数据库?按钮分别显示连接和断开.用最简洁的代码 句柄的解释! dbgrid中的问题 ---在线等候 大哥们帮小妹一下
显示图片 需要 uses jpeg;
if FileExt='.JPG' then
begin
try
ImgShow.Picture.LoadFromFile(ShellListView1.selectedfolder.PathName);
except
on ElnvalidGraphic do
ImgShow.Picture.Graphic:=nil;
end;
SetJPEGOptions(self);
end;
procedure TMainForm.btnYesClick(Sender: TObject);
var
MyJPEG: TJPEGImage;
MS: TMemoryStream;
begin
MyJpeg := TJpegImage.Create;
try
MyJpeg.Assign(image1.Picture.Graphic)
Ms := TMeMoryStream.Create;
MyJpeg.SaveToStream(Ms);
Ms.Position := 0; adoqrytest.Edit;
adoqrytest['id'] := '1';
TBlobField(adoqrytest.FieldByName('picture')).LoadFromStream(MS);
adoqrytest.Post;
finally
MyJpeg.Free;
Ms.Free;
end;
end;
2)读取jpg图片
procedure TMainForm.FormShow(Sender: TObject);
var
tempStream: TStringStream;
tempJpeg: TJpegImage;
begin
try
tempStream := TStringStream.Create('');
TBlobField(adoqrytest.FieldByName('picture')).SaveToStream(tempStream);
tempJpeg := TJpegImage.Create;
tempJpeg.LoadFromStream(tempStream);
tempstream.position:=0
DBImage1.Picture.Bitmap.Assign(tempJpeg);//到这里错误提示'jpeg error #41'
finally
tempStream.Free;
tempJpeg.Free;
end;
end;
var v_a:TJPEGImage;
begin
v_a:=tjpegimage.Create;
v_a.LoadFromFile('d:\rsc\mailtp3.jpg');
table1.edit;
table1.fieldbyname('zp').assign(v_a);
table1.post;
//TABLE1.MoveBy(2);
end;
读取
var
tempStream: TStringStream;
tempJpeg: TJpegImage;
begin
try
tempStream := TStringStream.Create('');
TBlobField(TABLE1.FieldByName('ZP')).SaveToStream(tempStream);
tempJpeg := TJpegImage.Create;
tempstream.position:=0;
tempJpeg.LoadFromStream(tempStream);
DBImage1.Picture.Bitmap.Assign(tempJpeg);//
tempstream.position:=0;
finally
tempStream.Free;
tempJpeg.Free;
end;end;
高红岩(ghyghost)
近日笔者书写一个小型的学生管理系统时,需要用到ADO控件存取SQL Server数据库图片,查看资料发现基本都是针对BMP文件进行操作(巨增数据库大小),但发现了★eagletian★高手翻译的ADO英文技术文档,里面涉及到了数据库存取JPEG文件的关键技术,在win98+sql server桌面版中测试通过,运行良好,现于源码公开如下:
unit Unit1;interfaceuses
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。
http://218.56.11.178:8020/web/index.aspx
-》下载基地-》例程-数据库/报表-》数据库图片存储