Linking C Language Windows DLL’s with Chilkat’s MinGW libs

(A helpful note from a Chilkat customer, reproduced in slightly edited form with permission) The primary issue was that I was creating a Windows DLL (using MinGW) rather than a Windows executable. Now, whilst I agree this shouldn’t make any difference it seems that it does. On the web site ( you indicate that MinGW systems should be linked with: […]

SOLVED: 425 Unable to build data connection: Operation not permitted

This error message is specific to the ProFTPd server.  A Chilkat customer found this error within the LastErrorText after trying to upload or download a file, or retrieve a directory listing: 425 Unable to build data connection: Operation not permitted The latest ProFTPd server has a configuration setting that by default requires SSL/TLS sessions to be re-used, and this breaks […]

How to Register an ActiveX DLL using regsvr32

(Also see the ActiveX DLL Registration Tutorial) The first step is to determine if you need to register the ActiveX DLL compiled for 32-bit or 64-bit.  If your computer is 32-bit, the choice is obviously 32-bit.  Let’s start with it: How to Register a 32-bit DLL on a 32-bit Windows operating system Using a text editor, create a .bat file […]