I'm working with a program, which I need to document and review, but which I did not write, nor did anyone I can easily reach. One of the problems I've run into is that it is supposed to read and work with .avi files, but every time I try, it fails. The file is an avi converted from an MTS format. The computer seems to think that it is an avi file, and it runs it without incident, but I don't know why the cvCaptureFromAVI is having trouble.
The function cvCaptureFromAVI simply returns null. I can't seem to get any deeper in the code to see what in cvCaptureFromAVI is causing the error, and I haven't been able to get any error information about why it won't read the file.
I was struggling with this problem for two days!
If you've double checked all other possible causes (file is in correct directory and inside your code the path to that file is in correct format) and still cvCaptureFromAVI returns null, the problem is your computer codecs.
I suggest you installing K-Lite Codec Pack. Remember to restart your computer if you are using Windows.
Related
According to this document, Xamarin should be able to write files in personal storage of application. Problem is, I used both XDocument.Save(string path) and XMLWriter to save my XML data to a file, but nothing happens! No Error but the file is not created either.
If you use another path, an exception will be thrown that you don't have access to that space, which means the code tries to write the file, but when you give it a legal space, it doesn't write anything.
I use:
System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal)
to get my path and then add "/file.xml" to it. I give this path to
XDocument doc = new XDocument();
doc = XDocument.Parse("<names></names>");
doc.Save(path);
I tried this solution in windows and it works but not in Xamarin.Android
As for Saving, I was able to do it after giving my app WRITE_EXTERNAL_STORAGE. However it seems odd...since I could write files through File.WriteAllText in the same place...and my code never threw any exception about illegal access or whatever.
After this problem, another odd thing happened. XDocument.Save wrote the file, but later when it wanted to load it, threw exception about "XML Declaration"...the odd part is, XDocument.Save itself writes that part automatically and it can't be wrong!When I checked the file, it was completely OK.
So, I conclude that either XDocument is buggy in Xamarin (since I used the exact code in windows without any problem) or my android device is buggy. Either scenarios are unlikely.
I hope you can solve this or at least tell what to do about it because I'm clueless. The thing is that once I've saved a .wxm file and then want to open it appears on wxMaxima this error and the "app" crashes:
Maxima encountered a Lisp error:
decoding error on stream
<SB-SYS:FD-STREAM for "socket 127.0.0.1:62607, peer: 127.0.0.1:4011"
{13F30991}
(:EXTERNAL-FORMAT :ASCII):
the octet sequence (195) cannot be decoded.
Automatically continuing.
To enable the Lisp debugger set debugger-hook to nil.
Thanks in advance.
P.S.: I run the latest Mac OS X version on my iMac.
Create a new file and write it down.
(setf sb-impl::*default-external-format* :utf-8)
(setf sb-alien::*default-c-string-external-format* :utf-8)
Save the file as .sbclrc at Home (User) folder.
I come back on this post as I have been affected by this today.
I am using Ubunutu 14.04 and the same bug appears. To me it is due to Maxima not being able to load anything else than ".mac" files, nothing to do with utf-8/ASCII (I have mv a file that is working to a wxm and vice-versa, it will not work anymore / rework)
Also I have prepared a workaround:
The idea is too have a tool that translates your .wxm files to a .mac file just before you load it (it is actually a very easy bash script)
So:
you put the wxm-to-mac.sh files into your path
then inside maxima, instead of doing
load("foo.wxm")
you simply do
system("wxm-to-mac foo.wxm")$
load("foo.mac")$
Bare in mind you shall not edit the foo.mac file because a routine might re-erase it afterward. Instead keep editing the .wxm file.
Hope it helps someone
Looks like the file has been saved with some non-ASCII characters (e.g. UTF-8) in it, but it is not read as UTF-8; that seems to be a bug in wxMaxima. Can you please post the offending .wxm file?
I was having the same problem, since none here could give a straight and correct answer (at least is not marked with the green icon) i tried to look somewhere else. I couldn't find an answer that solve my problem, but then i thought that i had used WxMaxima on Mac before and it worked pretty nice. The last time i installed wxmaxima on mac and it worked was in september 2012, i went to the http://sourceforge.net website and searched for the maxima file that was available on that date and i found http://sourceforge.net/projects/maxima/files/Maxima-MacOS/5.18.1-MacOS/, i installed it and its working pretty fine (about the problem, it is weird, even if i create a new maxima file typed "a" and saved it, i could no longer open it, so i'm guessing that it has nothing to do with ascii or non-ascii characters) I have no idea why this error happens on the recent version of Maxima/WxMaxima, but it makes no sense that we have to install a previous version for it to work.
Anyway, it's working for me, and i hope it works for you too. Glad i helped :)
I had the same problem.
In my case, the name of the directory where the ".wxm" file is located, contained Korean letter. I changed the directory name with an English one.
Then the problem has been solved.
I hope this works for you, too.
I hava an application that reads a file from a ZIP archive and saves it to file on file system. After writing it to file system I start start immediately to read this file with a SAX2 reader. On bigger files (300+ MB) it sometimes occures, that SAX2 stops parsing because of an unclosed tag. But when I check the file (or even try to read it again later) it works, so the file it self it OK.
FZipKit.ExtractToStream(LFileName, LStream);
LStream.SaveToFile(OutputFilename);
SAX2.processUrl(OutputFilename);
My assumption is, that the file was not yet fully written to file system when I started the parsing process.
Is there a way to ensure, that the file was written or the steam has been flushed to file system?
thx
I'm going to first of all assume that the XML parser operates correctly. If it is incapable of reading files, well the solution is obvious.
Which leads us to look at how the file is created. When you call SaveToFile, the file is opened, written, closed and buffers are flushed. In a plain vanilla system, your XML parser will see the entire content of the file. The only conclusion is that something is interfering. The most like suspect is your virus scanner. Many scanners, even the most respected ones, cannot properly handle a file being closed and then immediately re-opened.
The bottom line is that your code is fine and the problem almost certainly lies with your local environment.
I'm interested in some information inside a shadow file (.shd) located inside the windows print spooling directory "C:\Windows\System32\spool\PRINTERS". Every time a print job is started, a spool file (.spl) and a shadow file (.shd) are created in that directory. So far I have been successful in detecting when a print job has started, and have been able to pause that print job. If you don't pause the job, the files eventually make their way to the printer and then are deleted by windows.
My problem is. I cannot open the .SHD files because they are locked in such a way that you can not read them while they are open by the sprint spooler. I've even tried going to the file in windows explorer and simply copying the file to another file, and that didn't work either. The .SPL spool files I can open though. I simply wait, and fairly quickly the spooler release that file. For the shadow file though, it permanently holds on to this file. Unfortunately, its the one I need.
The line of code I'm using specifically to open the file is as follows:
m_spoolJobStream = new FileStream(spoolFilePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
The IOException I get is:
The process cannot access the file 'C:\Windows\system32\spool\PRINTERS\FP00083.SHD' because it is being used by another process.
So yes, it is being used by another process. Its being used by the window's print spooler service. But I don't think there is anything I can do about that. All I want to do is read the file. I don't want to make any changes to it. Is there anything I can do here or am I just screwed?
Check the option: "Keep printed documents" (if you have HP printer) and then see your spool file folder, both shadow and spool files would be there.
Well, I did not find a way around this problem. I suspect there is no solution for this and it is by design. However I did find another way to get the information I wanted (at least it seems so thus far).
I'm using the FindNextPrinterChangeNotification() routine out of the winspool.drv library. This guy returns a pointer to a PRINTER_NOTIFY_INFO structure, which in turn contains an array of PRINTER_NOTIFY_INFO_DATA structures. Within that array, there is an element with its "Field" member marked as "JOB_NOTIFY_FIELD_DEVMODE". This element contains a fairly large structure of type DEVMODE. The structure is explained by M$ here http://msdn.microsoft.com/en-us/library/dd183565%28v=vs.85%29.aspx . This structure looks like it contains what I'm looking for and apparently is wrapped up in the .SHD file anyways according to this page http://www.undocprint.org/formats/winspool/shd. I'd like to know what else is in that .SHD file, but I still can't open it because its locked while the job is paused, and I suspect that it stays locked until the job is complete. Oh well, I think my new solution is more elegant anyways.
Just make sure you pause the job in the spool on BOTH your box and the server, then you should be able to copy/open/move the shd file just like you can the spl file. Worked for me, anyway...
This works for me:
- Hang your printer (e.g. jam the paper)
- Print and observe .SHD and .SPL being created
- Stop Print Spooler
- Open the file
The problem might be the FileShare.ReadWrite parameter. You're asking to read and write on the file and maybe that's why you get an error. You should try asking for read-only permission.
I am getting file list in my Java program using list() method of File class. When I run my program on Knoppix I get ???? instead of Cyrillic file names. It seems that problem is in knoppix, not java. I tried to use options for mounting file system, such as nls and iocharset, but it has no effect (or may be I use it in wrong way). Somebody can help me?
I think that problem is as you said with Knoppix. Probably you do not have Cyrillic font bundled, so there is no way to display these code points.
If you want to fix this, you will need fix distribution, as there is nothing wrong with the program. I am not sure if this is the question for https://serverfault.com/ or https://superuser.com/, but you can read their FAQ's and ask how to fix it there (probably you will need to re-create Knoppix distribution).