1. 图像数据选择及保存
procedure Tform1.selectimageClick(Sender: TObject); //选择图像
begin
openpicturedialog1.Execute then
image1.Picture.LoadFromFile(openpicturedialog1.FileName );
end;
procedure Tform1.savetodbClick(Sender: TObject); //保存图像到数据库
var
ext:;
begin
image1.picture.Graphic <> nil then //避免image1中无图像保存出错
begin
adotable1.Edit ;
adotable1.FieldByName('myimage').Assign(image1.Picture.Graphic);
//以下记录保存到数据库图像格式
ext:=extractfileext(openpicturedialog1.FileName ); //取出文件扩展名
upper(ext) = '.BMP' THEN
adotable1.FieldByName('isbmp').VALUE := 1 //BMP型图像数据
ELSE IF (UPPERCASE(EXT) = '.JPEG') OR (UPPERCASE(EXT) = '.JPG') THEN
adotable1.FieldByName('isbmp').VALUE := 0; //JPEG型图像数据
ADOTABLE1.Post ;
end;
end;
2. 图像数据读取及显示
procedure Tform1.ADOTable1AfterScroll(DataSet: TDataSet); //ADOTable1AfterScroll事件思路方法
var
jpegimage:tjpegimage;
begin
image1.Picture.Graphic :=nil;
//下边BMP、JPEG两种图像数据必需分别处理
adotable1.fieldbyname('isbmp').As = '1' then //BMP型图像数据
image1.Picture.bitmap.Assign(adotable1.fieldbyname('myimage'))
//上边语句中bitmap不能为graphic,否则会出错
adotable1.fieldbyname('isbmp').as = '0' then //JPEG型图像数据
begin //begin2
jpegimage := tjpegimage.Create ; //通过jpegimage将图像显示在image1,否则会出错
try
jpegimage.Assign(adotable1.fieldbyname('myimage'));
image1.Picture.Graphic :=jpegimage;
finally
jpegimage.Free ;
end; //end try
end; //end begin2
end;
注:别忘了在单元文件接口部分uses语句中添入JPEG单元引用
以上代码在DELPHI6.0+SQL(或ACCESS或PARADOX)数据库下运行通过
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