Can anyone provide me a piece of code in dart language to get motherboard Serial Number?
I found some code in c# but I can't write it in dart language .
You can get some info with Device Info Plus package, even related to some internals, although I doubt if motherboard serial number - this information is so low level, that I find it hard to find any use case different than pure curiosity. But there are some properties returned for windows/linux platform which you have to check yourself.
In case you have windows, look how the plugin is written internally - there's a clue. You can fork the plugin and add new property based on some registry key for motherboards serial number. I'd start looking here. For linux there's similar way of finding things out.
Related
a particular question: is there a direct way to make an AS400 connection or do you have to go through PHP? I don't have to read data on DB2, but do the various commands (wrkactjob, wrksyssts, etc.). Thank you.... sorry for the English.
what I thought (maybe it can't be done) is this: in the app screen there are buttons, each button executes a command (wrkactjob, clroutq, etc.) and the answer occurs in another screen ... I didn't want to write commands directly like on 5250 or telnet
From your referral to typical "health checking" programs, like wrkactjob, and wrksyssts I guess your primary goal is to have an application running on your Android based phone to quickly check the status of a machine from wherever you are. Correct?
Have you considered how to get access to the machine's IP address when you're on the road and not connected to the local WiFi?
You can access this "performance data" through SQL — as John Y pointed out — and display it in whatever for is convenient on your mobile device. But I highly doubt Android provides ODBC infrastructure, even though you might manage to get the correct binary blobs (CPU wise) of the ODBC drivers from IBM botched into Android.
Otherwise you want to create a mechanism to scrape the screen for whatever is displayed, and translate that textual representation into UI elements provided by Flutter, if you want UI elements instead of textual output.
If you already have your doubts that you can't do telnet with Flutter, I think you'll have to learn a lot about Flutter as an SDK before even thinking about how to start developing an application. TCP/IP networking services are a function of the underlying OS and you'll have to go through all the Flutter abstraction layers to eventually be able to build a TCP session. With some luck, there is already code available to handle the telnet protocol peculiarities for you. Perhaps not, then you need to provide telnet negotiation and protocol yourself. This is documented in numerous RFCs. Use Google yourself.
Next point is: You need to establish translation routines for conversion of EBCDIC charset data into ASCII. Because Android is Linux based, you need to learn how to call libc routines like iconv() through Flutter, providing a C interface for charset conversion, including EBCDIC flavors as source/target.
Final point: You need to learn how to interpret the 5250 data stream, and translate the terminal emulator instructions into dynamically place Flutter UI elements at appropriate positions on screen. And of course you need to understand what to send back to IBM i to make it understand your request. The tn5250 data stream is also documented in publicly available RFCs.
There once was a facility called Workstation Gateway in the OS, but as I've found out, it has been removed in V5R2. This might have provided an easier means, because the 5250 data stream was converted on the fly to plain HTML.
Now it's your turn to decide if your goal is worth the apparent effort you're required to go through.
I am not sure what you mean by "direct". Do you mean doing your own socket programming? You could, but there are easier ways to connect.
The most obvious and straightforward choices are probably ODBC, JDBC, HTTP, and SSH.
ODBC and JDBC of course provide an SQL-based interface, and you can use that to issue commands (via the QCMDEXC procedure or scalar function) or access an increasingly comprehensive array of IBM i services.
If what you need still isn't available via SQL, or you simply don't like working in SQL, you could make use of the XMLSERVICE library, which provides its own programming interface "on top of" any of the connection types mentioned above. Despite all the instructions for building from source, normally this should already be installed on your IBM i. There are higher-level wrappers for XMLSERVICE in several programming languages (.NET, Node.js, PHP, Python, Ruby, and Swift), but as of this writing, not Dart. I am not familiar with Flutter, but I imagine you could use the JavaScript interop package to work with the Node.js wrapper.
What is the good and efficient language to develop a video streaming application using Gstreamer + gtk+ ??
The application which we developed has to do things notify the user whenever the some uneven behaviour occured where we are looking into...
Any suggestions will be useful.....
Thanks in advance😊
Of course depends on your liking and what else you need and want to do in the application. Since you are Gtk and Linux I would recommend to look at Vala:
https://wiki.gnome.org/Projects/Vala
I made a proof of concept app with that at some time to watch Twitch.tv streams:
https://github.com/fzwoch/twit-twat
Maybe take a look if you are fine with the ease and look of the language for your purpose.
No troll intended, but Vala looks like a dead end for most people I talk to. It's a specific language that never caught outside of GNOME, and I'm not sure it has the brightest future.
Rust seems to get wider adoption but seems still at an early age, still usable though, even for GStreamer use.
Python is both adopted, simple, and has stable bindings.
If you prefer a compiled language, C++ and GTKmm would be a possibility too, but at this point, depending on your requirements, and assuming you're not afraid of the moving ecosystem, Rust might still be a better choice.
We have a Beckhoff EtherCAT Coupler which is currently being controlled by some c# code, we call that c# code from a powershell script. We want to move the entire process of toggling slots on the coupler to the powershell script but I'm not sure how to do that. If you could provide me even with information on how to send/receive Modbus commands in powershell that would be hugely helpful.
Thank you!
EDIT:
Here is the code used in C# to toggle one slot of the IO coupler:
using System.Net.Sockets;
using Modbus.Device;
TcpClient tcp_connection = new TcpClient(ip, MODBUS_TCP_PORT);
ModbusIpMaster coupler = ModbusIpMaster.CreateIp(tcp_connection);
coupler.WriteSingleRegister(0x1120, 0);
coupler.WriteSingleCoil(slot, state);
Acontis offers an EtherCAT Master for Windows library and a C# example application you could leverage to include into your own application: https://acontis.com/en/ecsta.html
Working with machine automation controllers is highly manufacturer specific. I've got working knowledge only about Omron PLC & MACs, so I cannot provide exact details.
Anyway, one way would be to create a C# DLL and call it from Powershell. As how to program the coupler, start by finding out which model, exactly, you are working with and searching Beckhoff's documentation. Maybe there are suitable samples available.
Consider also contacting manufacturer's support. They might be able to provide advice with very reasonable pricing, unless the task grows into a consulting gig.
Programming PLCs and MACs is often done via manufacturer specific solutions. Those are much simpler to use than general-purpose language such as C#.
I am pretty dissatisfied with all the available media players, and I was also looking for a major project to really get into programming. so I am thinking of writing my own media player . Or to be more accurate a gui-frontend for mplayer (something similar to smplayer). How hard would this be.? I have plenty of time (months), and am willing to learn anything.
I practically don't have any knowledge of any windows/gui libraries . My programming experience : tried lots of different languages, wrote a couple of websites in php, lots of practice in java (although did nothing major) . Thats all
Can someone provide some guidance, about where to get started. what all to read. Which language should be used. is C#/.net a good language for this? since I am no expert in any language and have dabbled in plenty of different languages , I think I can pick up any language. Though My main concern is my lack of any practical knowledge . So guide me please.
Lastly my preference is windows (haha whatever), so thats what my target is and thats where I'll doing my coding.
To sum it up I want to create a guifrontend for mplayer that would work in windows.
Thanks
Edit: by mplayer I mean mplayer (the linux one) , and not WIndows media player.
One good place to start could be looking at how the code for gmplayer works - gmplayer is the graphic frontend for mplayer on Linux. It could be that all you really need to do is port the gmplayer code to Windows, then you get a fully integrated GUI instead of just a frontend.
Also, feature request: a nice friendly UI for putting video / audio effects on the output stream (it is so hard to use in the CLI version that most mplayer users probably don't even know it is in there).
I know what I'm going to recommend you is not what you're looking for, BUT:
I'd create a front-end for VLC, which uses Qt, a GUI framework which is extremely usable and easy to start with, in C++.
From my experience as an user, VLC is also more stable and has more features.
Start by copying a working implementation. As you mentioned, SMPlayer exists as a working example of what you want. I'd recommend starting by either hacking it to work better (the playlist really needs more intuitive controls, and multiple monitor support in Windows was nonexistent last time I tried it) or trying to duplicate it in your language of choice.
The benefits of hacking on an existing probject include: the existing codebase works, the margin of work required to make a noticeable change is much smaller, and the existing developers are able to help you come to speed with internals. Also, learning the project's language (C++) would be useful, though it may not be worth the effort if it's more interesting to copy its features in your favorite language.
C# is great for creating any desktop gui quickly. Best way to start with the gui design is to play a bit with the drag/drop components available in visual studio. For the functionality you can use this: http://msdn.microsoft.com/en-us/library/dd564585%28VS.85%29.aspx .
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I am planning to develop an operating system for the x86 architecture.
What options of programming languages do I have?
What types of compilers are there available, preferably on a Windows environment?
Are there any good sources that will help me learn more about operating system development?
Is it better to test my operating system on a Virtual Machine or on physical hardware?
Any suggestions?
For my final year project in collage I developed a small x86 OS with a virtual memory manager, a virtual file system and fully preemptive multitasking. I made it open source and the code is heavily commented, check out its source forge page at:
https://github.com/stephenfewer/NoNameOS
From my experience I can recommend the following:
You will need x86 assembly language for various parts, this in unavoidable, but can be kept to a minimum. Fairly quickly you will get running C code, which is a proven choice for OS development. Once you have some sort of memory manager available you can go into C++ if you like (you need some kind of memory manager for things like new and delete).
No matter what language you choose you will still need assembly & C to bring a system from boot where the BIOS leaves you into any useable form.
Ultimately, the primary language you choose will depend on the type of OS you want to develop.
My development environment was the Windows port of the GNU development tools DJGPP along with the NASM assembler. For my IDE I used IBM's Eclipse with the CDT plugin which provides a C/C++ development environment within Eclipse.
For testing I recommend BOCHS, an open source x86 PC emulator. It lets you boot up your OS quickly which is great for testing and can be integrated into eclipse so you can build and run your OS at the push of a button. I would also recommend using both VMWare and a physical PC occasionally as you can pick up on some subtle bugs that way.
P.S. OS development is really fun but is very intensive, mine took the best part of 12 months. My advice is to plan well and your design is key! enjoy :)
Language and compiler depend entirely on what you're attempting to accomplish. I would suggest, though, that you might be approaching the problem from too low a level.
There are materials out there on operating system fundamentals. MIT has OpenCourseware on the subject. Read through Andrew Tannenbaum's Operating Systems series, and look at things like Minix.
Get an idea for what's out there. Start tinkering with things. Borrow ideas, and see where they go. You can reinvent the wheel if you really want, but you'll learn more by building on the works of others.
It doesn't really matter, what language you choose. If the language is Turing-complete, then you can write an OS in it.
However, the expressiveness of the language will make certain kinds of designs very easy or very hard to implement. For example, the "liveliness" and dynamism of the old Smalltalk OSs depends on the fact that they are implemented in Smalltalk. You could do that in C, too, but it would probably be so hard that you wouldn't even think about it. JavaScript or Ruby OTOH would probably be a great fit.
Microsoft Research's Singularity is another example. It simply couldn't be implemented in anything other than Sing#, Spec# and C# (or similar languages), because so much of the architecture is dependent on the static type safety and static verifiability of those languages.
One thing to keep in mind: the design space for OSs implemented in C is pretty much fully explored. There's literally thousands of them. In other languages, however, you might actually discover something that nobody has discovered before! There's only about a dozen or so OSs written in Java, about half a dozen in C#, something on the order of two OSs in Haskell, only one in Python and none in Ruby or JavaScript.
Try writing an OS in Erlang or Io, and see how that influences your thinking about Operating Systems!
There is an OS course offered at the University of Maryland that utilizes GeekOS. This is a small, extensively commented OS designed for educational purposes which can be run using the Bochs or QEMU emulators.
For an example of how it is used in a course, check out a previous offering of the course at the class webpage. There, you will find assignments where you have to add different functionality to GeekOS.
Its a great way to get familiar with a small and simple OS that runs on the x86 architecture.
You might want to look up XINU. it's a tiny OS for x86 that isn't really used for anything other than to be dissected by students.
Use ANSI C, and start off with an emulator.
When you port over to a real machine, there will be some assembler code. Context switching and interrupt handling (for instance) is easier to write in assembler.
Andy Tannenbaum has written a good book on OS. Many other good ones exist.
Good luck! There is nothing quite like haveing written your own OS, however small.
Also check out the OSDev.org which have all information you need to get started.
I've done that once for a 386SX, which was on a PCI board. A good source on how to start a X86 cpu in protected mode is the source code of linux. It's just a few assembly statements. After that you can use gcc to compile your C code. The result is objectcode in ELF format. I wrote my own linker, to make a program out of the objectcode. And yes, it worked! Good luck.
Be sure to check out the answers to my question:
How to get started in operating system development
Without a doubt, I'd use Ada. It's the best general-purpose systems-programming language I have come across, bar none. One example, Ada's much better for specifying bit layout of objects in a record than C. Ada also supports overlaying records on specific memory locations. C requires you to play with pointers to acheive the same effect. That works, but is more error-prone. Ada also has language support for interrupts.
Another: Safety. Ada defaults to bound checking array assignments, but allows you to turn it off when you need it. C "defaults" to no bound checking on arrays,so you have to do it yourself manually whenever you want it. Time has shown that this is not the right default. You will forget one where it is needed. Buffer overflow exploits are the single most common security flaw used by crackers. They have whole websites explainng how to find and use them.
As for learning about doing this, the two books I'm aware of are XINU (Unix backwards, nothing to do with Scientology), and Project Oberon. The first was used in my Operating Systems graduate course, and the second was written by Nikalus Wirth, creator of Pascal.
If you are making a full OS, you will need to use a range of languages. I would expect Assembly, C and C++ at the very least.
I would use a Virtual Machine for most of the testing.
C most probably...all major OS-es have been written in C/C++ or Objective-C(Apple)
If you want write an OS then you need a couple of people. A OS can not write a single people. I think it is better to work on existing OS projects
Reactos --> C, Assembler
SharpOS --> C#
JNode --> Java
This is only a short list of OS projects. How you can see there is a project for every possible language.