1. José Gasparini
  2. PowerBuilder
  3. Thursday, 9 January 2020 14:28 PM UTC

Hi, I want to display a blob column in my window, I create a InkPicture object, get the blob column value in a blob variable, them use InkPicture.LoadInk() function, but not display the image

blob blb_imagen

 SelectBlob  foto
   Into :blb_imagen
   From admin.empleados
   Where empleado = 1
   using sqlca ;
 
If len(blb_imagen) > 0 Then
   ip_imagen.LoadInk(blb_imagen)
End If
 
Someone know why not show the image? Or If another way I can display a blob in my app mobile ?
 
Tks.
 
José

 

 

Michael Kramer Accepted Answer Pending Moderation
  1. Friday, 10 January 2020 18:23 PM UTC
  2. PowerBuilder
  3. # 1

Hey José! You may alter the data type for "image content" to expand beyond 32 kB.

My test table supports files up to 2 GB each. Code here is for SQL Anywhere 17.

CREATE TABLE "test_file"(
   "file_ID"  integer  not null DEFAULT autoincrement,
   "filename" varchar(260) null,
   "content"  long binary  null,  /* varbinary(max) in MSSQL.   BLOB in Oracle SQL */
   primary key ("file_ID"));

HTH /Michael

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José Gasparini Accepted Answer Pending Moderation
  1. Friday, 10 January 2020 17:51 PM UTC
  2. PowerBuilder
  3. # 2

Thanks for all answer, I resolved the issue, the problem was the image size, I had to control that it's low or 32K to show, and I changed InkPicture for p_1.SetPicture. 

 

Thanks very much

Comment
  1. Chris Pollach @Appeon
  2. Friday, 10 January 2020 18:22 PM UTC
Hi José;

No .. you should have increased the BLOB Data size in the PBODBCxxx.ini file. What you have now is reduced image clarity and still a chance that images approaching 32K will be truncated.

Regards ... Chris
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Chris Pollach @Appeon Accepted Answer Pending Moderation
  1. Thursday, 9 January 2020 17:07 PM UTC
  2. PowerBuilder
  3. # 3

Hi José;

  If you are using SA (formerly called ASA) and thus ODBC  ... did you set the BLOB length to go beyond 32K (its SA default)?

Regards ... Chris

 

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  1. Michael Kramer
  2. Friday, 10 January 2020 09:42 AM UTC
For comparison I use datatype = "long binary" and have no problems saving/loading PNG file of 39 kB
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Michael Kramer Accepted Answer Pending Moderation
  1. Thursday, 9 January 2020 17:00 PM UTC
  2. PowerBuilder
  3. # 4

Hey José,

I have expanded my tiny demo app with both JPG and PNG files. Here is what I have working:

  • Load directly from file into InkPicture
  • Load via BLOB variable into InkPicture
  • Save to SQL Anywhere 17 database from file
  • Load from SQL Anywhere 17 database into InkPicture

Let me know if you want my demo-app for comparison. I will add a button to create the test table I'm using before uploading. I use really ordinary SQL in the app so it should work in older SQL Any databases - or even in other DBMS as long as you substitute the datatype for the BLOB column to whatever BLOB type that DBMS is using.

HTH /Michael

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John Fauss Accepted Answer Pending Moderation
  1. Thursday, 9 January 2020 15:43 PM UTC
  2. PowerBuilder
  3. # 5

Greetings, Jose -

Have you considered using a Picture control instead of the InkPicture control? It supports JPEG's, and you can load a blob containing the image into a Picture control via its SetPicture function.

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José Gasparini Accepted Answer Pending Moderation
  1. Thursday, 9 January 2020 14:42 PM UTC
  2. PowerBuilder
  3. # 6

Hi Michael, thankyou for answer. I'm usign Sybase ASA 9, de datatype is Long Binary, I inserted an image JPG in this colum

Regards

Comment
  1. Michael Kramer
  2. Thursday, 9 January 2020 15:13 PM UTC
Two follow-up questions:

1) Can you load that JPG file directly into an InkPicture control using the IDE?

2) Can you load that JPG file dynamically using LoadPicture(<filename>)?

Not that I suggest workarounds but more to investigate the "data source" to assert it is "wellformed".

Hopefully others will join this Q&A. Honestly, I haven't used InkPicture since 2015 so I will create a tiny demo app to dust off some rust. If I remember correctly InkPicture is a little picky on picture formats for Load/Save.
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  1. Michael Kramer
  2. Thursday, 9 January 2020 15:40 PM UTC
So far I have tiny app running that can load JPG from file and load JPG via BLOB. I load the BLOB from a file. Still missing save to DB and read from DB. Let me know if your JPG behaves nicely ref my prior questions (1) and (2) before I also save to DB and load again. I have a feeling your image binary data is ill-formatted.
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Michael Kramer Accepted Answer Pending Moderation
  1. Thursday, 9 January 2020 14:35 PM UTC
  2. PowerBuilder
  3. # 7

You loaded the BLOB value from the database. What kind of data was stored in that BLOB field? 

BLOB being just a chunk of memory I guess it may be ill-formatted for the InkPicture image.

/Michael

Comment
  1. David Peace (Powersoft)
  2. Thursday, 9 January 2020 16:54 PM UTC
Can you write the blob data to a file with extention of .jpg and view that file as the image you want?

If so you should be able to display that in the ways Michael has suggested.
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