I´m using OpenNetCF in my Win CE app.
I need to use a shared memory solution, and I thought about Using the MemoryMappedFile.
But https://www.opennetcf.com/library/sdf/ does not show how to use it.
I mean, it´s clear to me how can I create a mapped file in one place. But is not clear to me how can I
open this mapped file in another place.
Does anyone has a example?
Or Does anyone has another solution for shared memory?
Here is another MemoryMapped file usage with example for CF: http://www.codeproject.com/Tips/79069/How-to-use-a-memory-mapped-file-with-Csharp-in-Win
Unfortunately ctacke's example is v.e.r.y. s.l.o.w.
Related
Recently, I've been trying to write to a .PAK file while it is being used by another process in ring 0. This has been a problem for quite a while and i haven't had much success. I am able to use any programming language necessary to accomplish this, but C#/VB.net is preferred. I originally wanted to use a find and replace system when editing, but I will just choose and offset to write to and such instead.
No, I can't just terminate the process then edit; the process must be running. Yes, I obviously know the process with the file handle attached.
No, I can't just run as admin because the process is established in ring 0/the kernel.
I've tried multiple methods including setting the process speed temporarily to 0 to edit then revert, and changing the FileShare and other parameters, none with any success.
One approach which I have been told a lot and which I have no experience in is creating a "Kernel Driver". I'm not sure how to go about this and I cant find much info online so if you think that's is the best method please inform me on how to get started. Any help is appreciated!
Always create a temporary file (a copy of your original file). If you need to process a file within your codes, create a temp file, use the temp file and process that file. So if you need another process, there will be no problem.
So here's whats up,
I am a Bench Technician for an IT company. I find myself repeating the same task over and over when preforming system reloads. I want to write an application where I have all the programs for a reload in one spot, and call them by a button click event. I have tried adding them into the Resources and calling them by Environment.CurrentDirectory+"\Path" to no avail, I get " System cannot find the file specified. When the path is hard coded it works like a charm, but this will obviously not do as it needs to be able to move to any system. I am looking for a way to add the exe's I need and a generic way to call the path. I am not looking for handouts here, I have done my homework on this one and still not found a solution, If I could get someone to -point me in the right direction, it would be awesome.
Since what you have already tried is much saner and easier for the average user to work with than having the files embedded in another executable, I'll explain that method.
CurrentDirectory is where your executable is executed from, Like this:
C:\MyDir> MyOtherDir\MyProgram.exe
CurrentDirectory refers to C:\MyDir in this example.
What you need is the application directory; and according to top answer of this question the most reliable way to get that is using AppDomain.CurrentDomain.BaseDirectory
EDIT: Also consider using Path.DirectorySeparatorChar instead of \.
I am looking at monitoring the access of a directory on our file system and it seems that FSEvent is the way to go.
From what I understand I need to set up a FSEventStreamCreate.
The examples I have found are for Objective-C and I don't quite understand how to use FSEventStreamCreate.
Can someone give me some ideas on how one might monitor a folder?
You have to declare a var as function type and define it
see here
I would like to use MapKit (on osx) to display custom map tiles from a .mbtiles (sqlite) database of the sort exported from TileMill.
MBXMapKit looks great, and is almost what I'm looking for. I could see how, with very little modification, MBXMapKit could be tweaked to point to a local .mbtiles database file.
Is there any way to use the MBXMapKit framework to accomplish this without tweaking? I did read the docs, and couldn't find a straightforward answer. I did find a private method on MBXOfflineMapDatabase called -initWithContentsOfFile: which sounds promising and looks like it does what I need -- is there anything to watch out for if I expose and use that method?
Alternate option is to subclass MKTileOverlay and use -loadTileAtPath:result:, which is easy to do, but also requires managing the connection to the sqlite file etc.
Have a look at this for the latest on MBTiles support:
https://github.com/mapbox/mbxmapkit/issues/3
It'll be coming probably in the next release. This should be distinct and separate from both the normal performance cache (NSURLCache) as well as the (also SQLite-backed) offline databases, which are meant for individual tile downloads being placed into a cache one-by-one.
It took me quite some time to work this out, but here is the link that got me on the right path.
https://github.com/mapbox/mbxmapkit/pull/110/commits/8b9fbf3fd56ae804a38c737305f128fd43a8225d
For some reason the method _mbtilesOverlay = [[MBXMBTilesOverlay alloc] initWithMBTilesURL:mbtilesURL]; can not be used on the latest version of MBXMapKit. I just replaced the .m and .h files with the files in the link, and used MBXViewController.m as a guide to get the map view to show the tile overlay.
I'm becoming mad trying to figure out how to resolve this task. My goal is pretty easy, copy a file on the USB stick every time that it is inserted and then release the USB stick turning off the LED. What is the best way to solve it?
1) I found this article
http://geekswithblogs.net/BruceEitman/archive/2008/06/13/windows-ce-monitoring-for-disk-insertion-to-add-support-for.aspx
or
http://geekswithblogs.net/BruceEitman/archive/2008/06/13/windows-ce-monitoring-for-disk-insertion-to-add-support-for.aspx
but I can't translate it on VB.NET project.
2) Then I read that is enough to use RequestDeviceNotifications for block devices. But How can I do that in VB.NET?
I would like to avoid OpenNetCF if possible.
Thank you
Since you don't want to "use OpenNETCF" I assume that you don't want to use any libraries or capabilities not built in to the CF. We'll skip the argument of that silliness and the "value of your time" discussion and take that as a requirement.
What you need to do is:
Use P/Invoke to call CreateMsgQueue. That's going to give you back a Handle. You'll probably want to do CloseMsgQueue as well for completeness
P/Invoke RequestDeviceNotifications and pass it the handle returned from #1 above along with the DEVCLASS GUID value for the device notifications you want - probably STORE_MOUNT_GUID. Again, adding StopDeviceNotifications for completeness is a good idea.
At that point you'll get a message on the queue whenever a insert or remove happens. You then call ReadMsgQueue to get the DEVDETAIL data in the message.
Parse the DEVDETAIL and look at the fAttached member.
It'd take me a while to write that for you, so you'll need to do this on your own.
Start writing the project, find P/Invoke routines for the calls you need (like FindFirstFile and CreateProcess). On SO, have a look at Storage Card Problem In windows mobile and How to register form for WM_DEVICECHANGE message in windows mobile.
You are only going to be dead in the water if you can not find a particular call that you can't make.
As you work through your project, post (or search for) the actual problems you run into.
Otherwise, it sounds like you are asking someone to write the project and hand it to you.