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I need to send data in real time between Delphi/C++Builder apps placed in different PCs not connected in the same LAN, only using Internet.
My first approach was via DataSnap REST server but it is not practical due proxy and router problems. The configuration was too hard for the users plus that some people do not like to have a web server running in their machines opening the corresponding ports.
My second approach is using a server in the middle. I am checking SignalR technology that seems to fit very well. It is well solved for C# but I cannot find any information about VCL, Delphi or C++ Builder.
Is there some library or do I need to work from scratch via WebSockets?
Is there another way to communicate VCL applications that run in separated PCs only connected to Internet?
/n Software has a WebSockets library - with C++Builder support.
https://www.nsoftware.com/ipworks/ws/
Docs at https://cdn.nsoftware.com/help/IWF/bcb/
Download (there is a trial edition) at https://www.nsoftware.com/ipworks/ws/download.aspx
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I am going to buy Delphi Tokyo because my company has XE2 and we need a fresh update. I see that Delphi tokyo has Linux support but I have 2 questions:
1) I have seen that I can make apps for linux ubuntu server. Does Delphi allow apps for ubuntu client lts as well?
2) Can delphi produce GUI? I mean firemonkey support for linux so that I can use buttons and so on. If not is it planned?
Thanks in advance
Currently, there isn't any native support for Linux client applications - however, third party client support is available via FmxLinux.
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I'm looking for a flexible monitoring tool, which should be able to:
Monitor public web endpoint and:
Validate REST API response body.
Validate response codes.
Monitor Azure resources: Cloud Services, Web Apps, SQL servers, VMs etc (Optional)
Support of custom monitoring scripts. For example, there is a PowerShell script which performs some checks and returns response if
service healthy or not.
Provide availability/performance metrics based on monitoring statistics.
Raise alerts and send notifications
Tool should have a modern UI and support of multiple monitoring projects, each project should have own isolated settings.
Currently we are using MS application SCOM (System Center Operations Manager), but it's a very old tool and has a poor documentation and UI. But a very flexible and can monitor a lot of thing out of the box.
Basically, is there something better and modern than SCOM?
We are using HP-BSM, though expensive, it's very flexible and with many capabilities. It has every functionality that you wrote in your question.
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I made an expensive mistake of building an Rails application using the Pusher service, because we wanted to work around the complexities of HTTP push. We are sending less than 500 events per day (without contents), but as we have to make the complete site HTTPS-only, we would have to go with a 50USD per month plan.
Are there any alternatives to Pusher with a more reasonable, pay-as-you go pricing model?
There's a whole host of self hosted realtime web technologies available including Slanger and poxa that allow Pusher's client and server libraries to be used. Slanger and Poxa are open source server implementations of the Pusher protocol. Slanger is written in Ruby and Poxa in Elixir.
Of course, Pusher removes the hassle of installation and maintenance, has a whole host of server and client libraries, massively reduces resource usage (since you're outsourcing the realtime communications layer), has a great community of users, and of course handles scaling problems
PieSocket works great and provides more free quota than Pusher.
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I am testing a scanning application and currently I dont have any scanner to plug it in. Is there anyway to have a virtual scanner like Daemon Tools does with Virtual CD Drives?
There's a Sourceforge project with a sample TWAIN implementation, including a virtual scanner. I haven't found anything similar for WIA.
Yes, there is a pretty simple to use application called UniTwain. I am using it and it works really nice for my users. You can download it from http://www.terminalworks.com/unitwain
I would like to make people aware of GenDS
Download ZIP
According to this web page, GenDS
is a ready-to-build Microsoft C++ 6.0 project that compiles to a
generic TWAIN Datasource (DS)
I am in the process of compiling it so I cannot give further advise.
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There has been some talk of Website performance monitoring tools and services on stackoverflow, however, they seem fairly expensive for what they actually do. Are there any good opensource libraries for automating checking/monitoring the availability of a website?
If you just want to know if your server is serving out content or not, take a look at Montastic. I use it, and am pleased. Plus its free!
It will ping your site periodically, and if it doesn't get a 200 status, it lets you know.
Intelligent website monitoring by simulating a human user is done with Sahi + OMD.
http://www.nagios-wiki.de/_media/workshop/2012/sahi2omd_simon_meggle_monitoring_workshop_2012.pdf
I have always used Zabbix especially for critical web sites. It uses MySql for the database and it has a PHP frontend. Of course it is open source and it is very flexible. It uses servers to stick data in the database and agents collect the data and send it to the servers. It is very scalable with this respect. I cannot recommend this software enough. I have all kinds of monitoring going on, not just web servers.
Check out mon.itor.us as well.