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loadFromStream/BLOB

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T O P I C R E V I E W
adyble	Posted - Jun 04 2024 : 08:24:30 Hello I've looked everywhere but can;t find an example. Below is my code to load an image form a database. It works ok with the cxImage but I can;t out how to load it into the ImaqeENViewer Thanks, Andy procedure TfmMidDBImages.LoadImage(); var BlobStream: TFDBlobStream; begin BlobStream := TFDBlobStream.create(qryImages.FieldByName('IMAGE') as TBlobField, bmRead); try cxImage1.Picture.LoadFromStream(BlobStream); ImageEnView1.IO.LoadFromStream(BlobStream); finally BlobStream.Free; end; end;
9 L A T E S T R E P L I E S (Newest First)
xequte	Posted - Jun 07 2024 : 16:15:57 Sorry, I'm not really understanding what you are trying to do here. TIEDBBitmap inherits all the usual bitmap methods of TIEBitmap, so you can just access the TBitmap as follows: fDBBitmap.AssignTo( myBMP ); Nigel Xequte Software www.imageen.com
adyble	Posted - Jun 07 2024 : 10:03:08 Or is it best not to use TIEDBBitmap at all and use TIEBitmap instead ?
adyble	Posted - Jun 07 2024 : 10:01:04 Hi Nigel I that's using TIebitmap but we are using the TIEDBBitmap? I'm trying - bmp.Read (fDBBitmap.???? ); I can;t work out how to get the bitmap from the TIEDBBitmap Andy
xequte	Posted - Jun 06 2024 : 21:57:45 Hi TIEBitmap.Read() and Write() both support stream overloads. http://www.imageen.com/help/TIEBitmap.Write.html e.g. // Output current image to a TImage bmp := TIEBitmap.Create; Stream := TMemoryStream.Create; bmp.Read( 'D:\image.webp' ); bmp.Write( Stream, ioBMP ); Stream.Position := 0; Image1.Picture.LoadFromStream( Stream ); Stream.Free(); bmp.Free(); Nigel Xequte Software www.imageen.com
adyble	Posted - Jun 06 2024 : 03:10:21 hi, The db is fine. Its a remote Mysql db. We can write to it no problem. I can give you temporary credentials if you want to try it ? There are only images stored on this database. If you can tell me how to get the imnge into a stream I can write the data manually into the BLOB.
xequte	Posted - Jun 05 2024 : 20:42:15 Hi Are you sure the database is not located in a read-only path? Nigel Xequte Software www.imageen.com
adyble	Posted - Jun 05 2024 : 09:25:32 I'd be happy to write the data using insert into, but don;t know how to get at the image Andy
adyble	Posted - Jun 05 2024 : 06:14:20 Thanks for the reply Nigel, That works ok for reading the data. Every time I scan a document using the demo or even compiled demo from you website, I get access violation on the fDBBitmap.Write(); line. The image shows ok, DBrecord remains in dsInsert, so the images is never written to the table. Andy
xequte	Posted - Jun 04 2024 : 18:34:36 Hi Please see the examples at: http://www.imageen.com/help/TIEDBBitmap.html For instance, to make a TImageEnView display the image at the current database position: // Create DB Aware TImageEnView procedure TMainForm.FormCreate(Sender: TObject); begin ... Open a database table ... fDBBitmap := TIEDBBitmap.create( DataSource1, 'Image', 'Name' ); ImageEnView1.SetExternalBitmap( fDBBitmap ); end; procedure TMainForm.FormDestroy(Sender: TObject); begin FreeAndNil( fDBBitmap ); end; To load an image from the current database position on demand: MyBMP := TIEDBBitmap.Create(); MyBMP.Read( MyTableImageBlob ); ImageEnView1.Assign( MyBmp ); MyBmp.Free; Nigel Xequte Software www.imageen.com