Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>As you probably know, that's very bad coding on the VB6 end. What it's trying to do is to cast the Single data -- which is the same as float in C# -- as a String. But while there are better ways to do that, it's a really bad idea to begin with.</p> <p>The main reason is that reading the binary data into a VB6 BSTR will convert the data from 8-bit bytes to 16-bit characters, using on the current code page. So this can produce different results in the DB depending on what locale it's running in. (!)</p> <p>So when you read it back from the DB, unless you specify the same code page used when writing, you'll get different floats, possibly even invalid ones.</p> <p>It would help to see examples of data both in binary (single) and DB (string) form, in hex, to verify that this is what's happening.</p> <p>From a later post:</p> <blockquote> <p>Actually that is not "bad" VB6 code.</p> </blockquote> <p>It is, because it takes binary data into the string domain, which violates a prime rule of modern VB coding. It's why the Byte data type exists. If you ignore this, you may well wind up with undecipherable data when a DB you create crosses locale boundaries.</p> <blockquote> <p>What he is doing is storing the array in a compact binary format and saving it as a "chunk" into the database. There are lots of valid reasons to do this.</p> </blockquote> <p>Of course he has a valid reason for wanting this (although your definition of 'compact' is different from the conventional one). The ends are fine: the means chosen are not.</p> <p>To the OP:</p> <p>You probably can't change what you're given as input data, so the above is mostly academic. If there's still time to change the method used to create the blobs, let us suggest methods that don't involve strings.</p> <p>In applying any provided solution, do your best to avoid strings, and if you can't, decode them using the specific code page that matches the one that created them.</p>
    singulars
    1. This table or related slice is empty.
    1. POConversion from VB6 string data to .NET byte array
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USJim Mack
    1. USJim Mack
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThanks, I've added example data to my post
      singulars
      1. PO
      1. USRobbert Dam
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload