Using C DLL functions and structures in VB6 applications

LEADTOOLS toolkits support developing applications under VB6 using our C DLL functions and structures.

Our old toolkits (before LEADTOOLS v17.5) support COM objects and ActiveX controls that can be used in VB6 applications. Starting from LEADTOOLS v17.5, our toolkits are no longer supporting COM objects and ActiveX controls. However, you can still develop VB6 applications using our C DLL functions and Structures. Note that you can use this technique with the older versions of the toolkits.

The various APIs in our C DLLs contain a huge number of functions and structures, and almost all of them can be used in VB6 applications. You can define our C DLL structures in VB6, and import the C DLL API's. This will allow you to use our C DLL functions and structures in VB6 applications.

You can check out the C DLL help file, which you can find in your Start menu with the installed toolkit (also online at C DLL Help Topics). This will help guide you with further information regarding our function calls and examples in C for you to follow.

We don't have VB6 demos shipped with our toolkits (demos that use C DLL functions). However, we have sample projects posted on our forums. Here are some of them:

1. Load and Save Images
   File Attachment(s):

   VB_19_LoadAndSave.zip (3kb) downloaded 463 time(s).
   
   
   
2. Splitting a Multi-Page TIFF File
   File Attachment(s):

   VB6_v175_SplittingTIF.zip (4kb) downloaded 287 time(s).
   
   
   
3. Minimum OCR Professional demo
   File Attachment(s):

   VB_175_OCR.zip (6kb) downloaded 1,331 time(s).
   
   
   
4. Minimum OCR Advantage demo
   File Attachment(s):

   VB6_19_OCR.zip (6kb) downloaded 371 time(s).
   
   
   
5. Save Password-Protected PDF
   File Attachment(s):

   VB6_18_SavePdfPw.zip (3kb) downloaded 555 time(s).
   
   
   
6. Reading 1D and QR Barcodes
   File Attachment(s):

   VB6_QR_Barcode_LEADTOOLS_175_With_CDLL.zip (5kb) downloaded 289 time(s).
   
   
   

If you need more details, send an email to support@leadtools.com and include full details about your question.

Edited by moderator Monday, July 10, 2017 3:16:40 PM(UTC)  | Reason: Added OCR Advantage link and attachments