Why drag and drop stopped working

[fartang]

@Doitsu: Exactly the same problem here, D&D works fine with other programs, used to work fine with Calibre until a month or two ago, and now does not work with Calibre. Can you tell what firewall you are referring to and how can I disable it? Thanks

[BetterRed]

Originally Posted by fartang

@Doitsu: Exactly the same problem here, D&D works fine with other programs, used to work fine with Calibre until a month or two ago, and now does not work with Calibre. Can you tell what firewall you are referring to and how can I disable it? Thanks

@fartang

You shouldn't have to disable a firewall, but you might need to configure it to 'trust' Calibre. Calibre accesses the net quite a lot, e.g. it chats to this site to see if there are any plug-in updates.

What firewall do you use on each of your two computers - same one or different one. Do you run any other gadgets - like anti-loggers (e.g. PerfectGuard) or internet gate-keepers (e.g. App-Blocker)

I run the Zemana anti-logger, and I have to retrain it every week when I install new Calibre, it only takes a second - so doesn't bother me.

I also run the MS firewall on Win7, I used Comodo on XP. The added value Comodo gives on Win7 is marginal and for me its not worth the overhead.

BR

[Doitsu]

Originally Posted by fartang

Can you tell what firewall you are referring to and how can I disable it? Thanks

I use Commodo and simply temporarily changed the Firewall Security Level to Disabled and restarted Calibre.

Originally Posted by BetterRed

You shouldn't have to disable a firewall, but you might need to configure it to 'trust' Calibre. Calibre accesses the net quite a lot, e.g. it chats to this site to see if there are any plug-in updates.

In theory, yes, but for some reason it doesn't work. For example, Calibre can access the Internet to get metadata, but drag and drop still doesn't work.
Since I don't have drag and drop problems with other programs, I strongly suspect that there's something wrong with Calibre's Windows drag & drop code.

[DoctorOhh]

Originally Posted by Doitsu

Since I don't have drag and drop problems with other programs, I strongly suspect that there's something wrong with Calibre's Windows drag & drop code.

The converse could also be true, since every other firewall out there does not inhibit calibre's drag and drop process, I strongly suspect that there's something wrong with Commodo's code.

Kudos for providing help with this issue.

[Doitsu]

Originally Posted by dwanthny

The converse could also be true, since every other firewall out there does not inhibit calibre's drag and drop process, I strongly suspect that there's something wrong with Commodo's code.

That is definitely a strong possibility, however, IIRC, there are several different ways to implement drag & drop event handlers in Windows apps and since Comodo Firewall doesn't block drag & drop in other third party programs, it stands to reason that the drag & drop implementation in the Windows version of Calibre might not be robust enough.

Therefore the following questions remain:
1. Was there a significant change in the drag & drop event handler code and/or the shell extension code in the Windows version of Calibre in this year?
2. Does Calibre use a non-standard method to implement drag & drop that might fail under certain circumstances?

[kovidgoyal]

The drag and drop event is never reaching calibre code. And event handling in calibre is done by Qt toolkit, I highly doubt the Qt toolkit uses a non robust D7D implementation, since it is the basis of a large number of windows programs.

[gapeach12]

I know this post is old, but I had the same issue and finally came across a solution that worked for me.

I found the solution in this thread:

https://www.mobileread.com/forums/sh...d.php?t=120818

Steps: right-clicked the Calibre desktop app--> Properties-->Compatibility
Click to uncheck Run as Administrator then click Apply.

Hopefully drag and drop now works for you :-)

[BetterRed]

See ==>> Using the viewer or doing any conversions results in a permission denied error on Windows

…you can run calibre as Administrator, but doing so will cause some functionality, such as drag and drop to not work.

Why were you running calibre as Administrator, there's no good reason to do so.

BR

[gapeach12]

Originally Posted by BetterRed

See ==>> Using the viewer or doing any conversions results in a permission denied error on Windows



Why were you running calibre as Administrator, there's no good reason to do so.

BR

Honestly, I don't remember. I don't recall ever selecting it, but i must have. So, I was probably trying to troubleshoot something and forgot it was selected. I'm just glad to finally have Calibre working correctly again.