C / C++ / MFC

Stefan_Lang12-Jan-20 23:21

Stefan_Lang

12-Jan-20 23:21

Is that Linux sleep() or Windows Sleep()? Or, more to the point, are you sleeping for 1 second, or 1 millisecond? If the latter, maybe you should try to increase the time to around 100ms: The Windows file system is not very fast, and might be hamstrung by constantly trying to open nonexistant files.

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leon de boer12-Jan-20 23:52

leon de boer

12-Jan-20 23:52

It's clearly windows no such thing as CreateFile in linux and he already stated it can take 5min to open the file (I assume of a network drive) so 100ms is not going to change anything Smile | :)

In vino veritas

David Crow13-Jan-20 5:02

David Crow

13-Jan-20 5:02

In addition to Leon's suggestion, there's also FindFirstChangeNotification().

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Daniel Pfeffer13-Jan-20 23:38

Daniel Pfeffer

13-Jan-20 23:38

If you are waiting for the file to be fully created (i.e. completely written), then this code won't work. At best, it will wait until the file is created (i.e. when the other task opens it for writing).

The problem may be broken into two steps:

Wait until the file is created (i.e. it appears in the directory)
Wait until the file is closed (i.e. the writing is completed)

Others have given you good ideas about how to wait for the file to be created. In order to wait for the file to be completely written, the best way would be for the other application to create another file AFTER it is done with the data file. For example:

Your application waits for the creation of DATA.DAT
Other application creates file DATA.DAT (your application detects the creation)
Other application writes into DATA.DATA (your application waits for the creation of FINISHED.DAT)
Other application closes DATA.DAT
Other application creates FINISHED.DAT (your application detects FINISHED.DAT, and knows that DATA.DAT is ready)

There are some other points to handle (e.g. what happens if DATA.DAT is created before your application starts waiting for it?), but this is the basic idea.

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Joe Woodbury14-Jan-20 20:15

Joe Woodbury

14-Jan-20 20:15

IF you know that this will be on a local drive, an alternative is to create the file in a different directory and then move it to the target directory.

Veteran VS2008 users here? Ever lost your debug functions?

Daniel Pfeffer14-Jan-20 20:58

Daniel Pfeffer

14-Jan-20 20:58

Subject to the limitation you mentioned, that would work, too.

Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.

charlieg9-Jan-20 1:59

Re: Veteran VS2008 users here? Ever lost your debug functions?

9-Jan-20 1:59

Yes, I know VS2008 is old, but I have to use it for a development project.

Anyway, a couple of weeks ago, I installed some software from Intel that broke my VS2008. Nothing would compile, I could not set breakpoints, etc. Using a clean Windows 10 VM, I re-installed VS2008, SP1 and an ATL update required for WEC7 development. I can compile and set breakpoints again. Joy. Now it gets a little weird. The step over (F10) and step into (F11) functions refuse to work. They are being treated as the go (F5) commands, making it just about impossible to get anything done. Note that even the menu debug commands behave this way.

Now it gets a little weird now - it seems to be project/solution related. If I debug project A the functions work, debug Project B (the one I really need to work on) they don't.

So a clean re-install did not fix this, a reset to all settings didn't fix it, deleting .suo, etc files didn't fix it... maddening OMG | :OMG:

Thoughts? Ever run into this?

Charlie Gilley
<italic>Stuck in a dysfunctional matrix from which I must escape...

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Afzaal Ahmad Zeeshan9-Jan-20 22:28

Afzaal Ahmad Zeeshan

9-Jan-20 22:28

Perhaps some project-specific configurations are overriding the behavior?

Check this thread, asp.net - 'Step Into' not working in Visual Studio? - Stack Overflow

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Re: Veteran VS2008 users here? Ever lost your debug functions?

charlieg10-Jan-20 3:51

Re: Veteran VS2008 users here? Ever lost your debug functions?

10-Jan-20 3:51

You would think, but depending on machine / project the behavior varies.

phil.o9-Jan-20 22:46

phil.o

9-Jan-20 22:46

It's a long shot, but if the issue is project-specific, then you can try to delete the .suo file from the project directory and re-open the project.

"Five fruits and vegetables a day? What a joke!
Personally, after the third watermelon, I'm full."

Re: Veteran VS2008 users here? Ever lost your debug functions?

charlieg10-Jan-20 3:53

Re: Veteran VS2008 users here? Ever lost your debug functions?

10-Jan-20 3:53

This is a common suggestion - I've done it several times on multiple projects with no success.

The part that I don't get is that the actual menu functions don't work, implying some sort of corruption in VS2008 - *but* that makes no sense since one project will work and the other won't. It should be corrupt for both.

_Flaviu9-Jan-20 23:19

Re: Veteran VS2008 users here? Ever lost your debug functions?

9-Jan-20 23:19

Another approach is to create a VS2008 valid project and to import all your files from the old one. Then you will have your app settings fresh new. I know, is a little work to do, but I am sure will solve your issue.

modified 10-Jan-20 5:46am.

charlieg10-Jan-20 3:58

Re: Veteran VS2008 users here? Ever lost your debug functions?

10-Jan-20 3:58

Good suggestion, but I cannot even get a simple Yellow World dialog app to debug properly.

Maddening.

Thanks for the suggestions

charlieg10-Jan-20 4:15

Re: Veteran VS2008 users here? Ever lost your debug functions?

10-Jan-20 4:15

Well, I may have isolated the issue a little closer - the behavior changes depending on what SDK I select - I have multiple embedded CE projects.

charlieg21-Jan-20 11:53

21-Jan-20 11:53

In case someone runs into this in the future - Microsoft has released an update for SP1 for VS2008 Professional that addresses the problem I was having. I really think I applied it one time before, but maybe I got things out of sequence. Anyway, it's KB2483802, link: Download Visual Studio 2008 update for Windows Embedded Compact 7 from Official Microsoft Download Center[^]

srandom and random

_Flaviu9-Jan-20 0:44

9-Jan-20 0:44

Sorry to get more and more questions here, but with your support I am solving issues one by one Smile | :)

I got 2 errors:

C++

error C3861: 'srandom': identifier not found
error C3861: 'random': identifier not found

the problem is I don't know how to replace them with Windows versions ... because I didn't found them as defined somewhere ... from your experience, what could be similar windows functions ?

phil.o9-Jan-20 1:03

phil.o

9-Jan-20 1:03

Maybe you can have a look at <random> header[^] and/or srand (<cstdlib> header)[^]?

"Five fruits and vegetables a day? What a joke!
Personally, after the third watermelon, I'm full."

_Flaviu9-Jan-20 2:29

9-Jan-20 2:29

These tho two calls are coming from a Linux code ... and I didn't found documentation about them.

Richard MacCutchan9-Jan-20 1:26

Richard MacCutchan

9-Jan-20 1:26

Take a look at C/C++ language and standard libraries reference | Microsoft Docs[^], where you will find all the C and C++ library references.

David Crow9-Jan-20 3:25

David Crow

9-Jan-20 3:25

Probably need to use srand() and rand().

_Flaviu9-Jan-20 6:42

9-Jan-20 6:42

That worked. Thank you !!!

k50549-Jan-20 9:03

k5054

9-Jan-20 9:03

Works, but is it wise? Depending no what you are doing, you might want to use the rand_s function instead. Be aware that some implementations of rand() have quite short periods and are predictable, so may not be a good choice if you require a good source of randomness. See also MSC30-C. Do not use the rand() function for generating pseudorandom numbers - SEI CERT C Coding Standard - Confluence

_Flaviu9-Jan-20 21:03

9-Jan-20 21:03

I have tried to use srand_s and rand_s, but no one is recognized by my compiler:

C++

error C3861: 'srand_s': identifier not found
error C3861: 'rand_s': identifier not found