I wrote an unattended HTTPS upload client which shouldn't require user interaction.
Everything was flawless until I deployed it blindly to a remote system that I do not have a remote desktop access to. The tool reported in logs that SSL libraries are missing.
Ok, I deployed LIBEAY32.dll and SSLEAY32.dll to the application folder on the remote system, but then the tool hung and I couldn't figure out what was going on until I wrote a tool which makes a remote screenshot.
On the screenshot I see a modal window from csrss.exe process with a message:
The program can't start because MSVCR120.dll is missing from your computer.
The window appeared despite of having a lot of try except blocks and Application.OnException handler.
I would like that in such cases application would not be hold up so it can report failure to it's log.
How to achieve this?
In a current implementation TIdHttp.Post call just hangs.
P.S. I solved the absence of DLL by copying it to app folder, but my question is about catching such errors.
To avoid this error, you can use the OpenSSL DLLs available on https://indy.fulgan.com/SSL/
They do not have this dependency on MSVCRT.
Or, use TNetHTTPClient.
From this answer:
TNetHTTPClient was introduced in Delphi XE8.
The most important benefit of TNetHTTPClient is that it allows your application to support HTTPS without having to provide your own support for SSL/TLS. TNetHTTPClient relies on the SSL/TLS support provided by the operating system.