is it possible to use this dll with delphi?

why wouldn't it ?
you'll need to know if it's cdecl or not ...

and you'll need the function definitions
i can only read the headers of the help file, the contents seem to be missing


bottomline ... you don't really need that dll

I don't see why it shouldn't work, because the source file is available. You need Visual Studio first though, because the DLL doesn't expose the functions. Using https://www.nuget.org/packages/UnmanagedExports you can expose it.
If you dllexport BarCode.BarcodeConverter128.StringToBarcode to StringToBarcode128 then try this in Delphi:

function StringToBarcode128(x: String): String; cdecl; external 'own_barcode.dll';

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String variable ?
from a VS assembly ????

that's more likely going to be a PChar or a PWideChar

ID: 42257077

Why don't I need that Dll?

cos he posted a link to the original barcode on which there is also delphi samples
with this string building functions
riginal Font and older code

The font was originally created by grandzebu.net where you can download the original font and see other coding examples in other older languages such as FoxPro, Delphi, VB6 and others (look towards the bottom of the page for this information).  
Be aware, this site is in French, but there is an English version for most of the information which is where the above link will redirect you.

and on this page, you can download code samples
http://grandzebu.net/informatique/codbar-en/code128.htm

there is 2 french samples

of which a serious editing is required.
1: they are in French
2: awfull indenting
3: using global variables ? wtf ?

Geert Gruwez

I downloaded that and it doesn't work fine :(

I have the code in delphi and the characteres is different and when I call the font barcode 128, it doesn't make the correct codebar.

This is my string line that must be encoded to work with barcode128:

000096911  1        24700HR3 L200000015000PC

That old cold returns me:  Ò  Ä{Í1  1        24700HR3 LÌ4  !R ÍPCÅÓ

The new code from that site returns me:        Í Ä{È1 1 24700HR3 LÇ4 !R ÈPC]Î

As you can see, it is different and only the side can give me the correct barcode 128

did you understand?

ID: 42257162

Thanks a lot for giving me a light

I am gonna try it.  :)

Well,

Unfortunately I didn't have any success.

I tried that code only for 128 and I got a long list. I noticed that code is also used in QRbarCode component. It is a old componet

Thanks for your help.

I got another way to do that by mssql - but I thank for point me other ways