C# Discussion Boards - CodeProject

Re: Has anybody ever seen this IO exception before?

2-Mar-09 11:42

I'd have 9,000 posts on codeproject too if I spent all my time being a jackass. I even posted that I googled and didn't find anything. I should have posted that I didn't find anything helpful! I know what the exception is. My code caught and logged it... What I'm not sure about is what to do with it. The error code from the message, "A system call that should never fail has failed." is not exactly normal.

Hogan

led mike2-Mar-09 11:56

led mike

2-Mar-09 11:56

snorkie wrote:
I'd have 9,000 posts on codeproject too if I spent all my time being a jackass.

Your post didn't say anything about searching for the ERROR CODE, so f*** off you brain dead a**hole.

Oh, and have a nice day.

Re: Has anybody ever seen this IO exception before?

snorkie2-Mar-09 12:03

Re: Has anybody ever seen this IO exception before?

2-Mar-09 12:03

Sounds like a great idea. Its 5:00pm and I have nothing to do tonight!

Hogan

Yusuf2-Mar-09 12:15

Yusuf

2-Mar-09 12:15

never encountered it before,

snorkie wrote:
I'm not sure what to do with this.

may be you should log it to the "This log shall have no entries" log. Big Grin | :-D

Yusuf

Re: Has anybody ever seen this IO exception before?

pbarrette3-Mar-09 15:30

pbarrette

3-Mar-09 15:30

Hi snorkie,

Have a look here:
http://msdn.microsoft.com/en-us/library/ms740668(VS.85).aspx[^]

Reflector tells me that Socket.Receive ultimately calls on "ws2_32.dll" to get the job done and its recv function is returning a failure code of WSASYSCALLFAILURE (10107).

The description in the link above suggests a possible multi-threading issue or a corruption of the underlying network stack.

pb

How to create an instance of a c++ class inside a dll in a c# project

EcK3kO2-Mar-09 11:16

EcK3kO

2-Mar-09 11:16

Hi everybody hope you could solve my problems well let me explain it...

I have a c++ dll that uses MFC
I need to create an instance of a class inside that dll in a c# project
I need to end with another dll that can be added as reference in that c# projects
I have the code of the c++ dll so if necessary i can change it.

ok solutions? i have found many possible "solutions" but all that information confused me, well the possible solutions i found are:

Inside the c++ dll project add a managed class that just act as a proxy, the problem with this solutions begins when trying to compile it because causes many errors with "/clr" options...

Create a new managed c++ project that act as a proxy and use the dll, but i just couldnt use the dll inside the new project...

Create a rcw in c# with sentences like comimport... marhall... etc... but i just couldnt find a good tutorial for dummies. example i dont know where to get the GUID :S.

ok any solution that you can give me? an url to read? or what to search please help me... Confused | :confused:

Inside

Re: How to create an instance of a c++ class inside a dll in a c# project

led mike2-Mar-09 11:32

led mike

2-Mar-09 11:32

EcK3kO wrote:
I need to create an instance of a class inside that dll in a c# project

You can't do that.

One thing you can do is wrap that class in a managed class using C++/CLI. There are a massive number of introductory articles and information about CLI on the internet. There is even a series of beginner articles here on Code Project and of course a large amount of information on MSDN.

Easy memory optimizations?

bbranded2-Mar-09 10:54

bbranded

2-Mar-09 10:54

Hello,

I just finished one of my first programs, a program to show and hide windows by process. I'd like to go ahead and give it to my boss to put it in production, but the memory usage ranges from 12-15MB, and doesn't seem to make any sense.

A co-worker of mine has a similar piece of software (handles z-order of windows), which he programmed in delphi, and it only takes 4-5MB of RAM.

I attempted to call the garbage collector more frequently, but, as expected, this didn't have much of an effect (from what I've been reading, it does its job pretty efficiently on it's own).

Does anyone have any tips for memory optimization?

Thanks very much,

Matt

Dave Kreskowiak2-Mar-09 11:04

Dave Kreskowiak

2-Mar-09 11:04

First, if you're looking in TaskManager to see the memory usage, it's lying to you. You're app isn't taking that much memory. A .NET app, like Java, runs in a kind of virtual machine. What you're seeing is what the .NET CLR has reserved for your application, even if the memory isn't being used. No, you can't do anything about it since all memory management is done automatically by the CLR.

If Windows needs the memory the CLR has reserved back, the CLR is more than happy to return whatever it can. The reseason the memory is reserved to start with is because when your code allocates memory for an object, it's much quickler to allocate it out of the managed heap the CLR maintains, than it is to go back to Windows, ask for a block of memory, add it to the managed heap, then allocate your object.

Calling the GarbageCollector doesn't do anything for you except screw up the internal optimization algorithm it uses. Unless you're an advanced developer with a definite need to do this and know precisely why you're doing it and the consequences of doing it, you show never force the GC to do an early collection.

Plus, 12 to 15MB of memory is nothing now-a-days, so what are you worried about??

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Yusuf2-Mar-09 12:20

Yusuf

2-Mar-09 12:20

Dave Kreskowiak wrote:
Plus, 12 to 15MB of memory is nothing now-a-days, so what are you worried about??

from OP

OP wrote:
A co-worker of mine has a similar piece of software (handles z-order of windows), which he programmed in delphi, and it only takes 4-5MB of RAM.

The Boss will make big fuss about .net Blush | :O

Yusuf

Dave Kreskowiak2-Mar-09 16:43

Dave Kreskowiak

2-Mar-09 16:43

Yusuf wrote:
The Boss will make big fuss about .net

Then the boss needs to read up on it and make form and educated opinion. The size of the runtime means nothing when it's productivity in writing code that's far more important. Ask him if he knows how memory management works in the .NET CLR. Does he know how it works in Delphi? Then compare the two.

Oh, and this reading is not just for the boss. It should be for you too, so you can explain it to him...

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Luc Pattyn2-Mar-09 11:26

Luc Pattyn

2-Mar-09 11:26

Hi,

I agree with Dave.

bbranded wrote:
Does anyone have any tips for memory optimization?

The best optimization tip, assuming the functionality requirements warrant it: add lots of code and functionality, and rejoice when multiplying the source by 1000 makes the memory footprint grow by a much smaller factor.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
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modified on Sunday, June 12, 2011 9:03 AM

bbranded2-Mar-09 12:26

bbranded

2-Mar-09 12:26

Thanks for the info guys. I remember reading a blog post about it, but failed to be able to cite it to the senior dev.

I understand what you're laying Luc. Neato.

Thanks,

Matt

Luc Pattyn2-Mar-09 12:29

Luc Pattyn

2-Mar-09 12:29

you're welcome.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Re: Easy memory optimizations? [modified]

DaveyM692-Mar-09 12:50

DaveyM69

2-Mar-09 12:50

This isn't a solution as such - but an observation. When an .Net application is minimized, the reported RAM useage in task manager decreases dramtically. I found this with an app that I did that ran in the tray mostly. On launch I forced it to minimize before placing it in the tray and all the clients stopped moaning!

Also, make sure you've compiled it as 'Release', not debug if you're just testing/running the exe rather than an install, that can make a difference too.

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)

bbranded2-Mar-09 13:01

bbranded

2-Mar-09 13:01

Thanks Dave. I'll see if I can work something out with minimize.

I was looking for this today, is there a way to specify this in C# Express?

Thanks!

Matt

[edit]

Found it! http://cygon.nuclex.org/2006/07/02/debug-and-release-in-visual-c-express/[^]

modified on Monday, March 2, 2009 7:11 PM

Regex

Dromar2-Mar-09 10:54

Dromar

2-Mar-09 10:54

Hi everyone,

I use Regex for splitting a string. Now i have 2 Questions:

1. I have e.g the string "something || anything && anotherthing" and I want to split it into string[3] ={ something, anything, anotherthing }; is there an easier way than to use 2 Regex like Regex("||") and Regex("&&") and split it first with one Regex and then each element with the other?

2. I have heard that when you split a string you can leave the splitsequence (like in the example before "||") to one of the stringsresults. How can I do that?

Thanks for your help!

Maxim Langman2-Mar-09 11:11

Maxim Langman

2-Mar-09 11:11

If you have the same delimiter between strings, then the easiest way is to use Split() method of string class.

string str = "aaa::bbb::ccc";
string[] splittedStrings = str.Split("::");

But, if the explression is more difficult, then Regex is a good solution

snorkie2-Mar-09 11:23

2-Mar-09 11:23

Why not just use the following regex: "( \|\| )|( && )" It finds either and can be used in your split.

Hogan

Dromar2-Mar-09 12:12

Dromar

2-Mar-09 12:12

Somehow that is not working...
I tried
Regex reg = new Regex("(\\|\\|)(&&)");
on
string input = "something || anything && anotherthing";
but it isnt Spliting it even once Frown | :(

snorkie2-Mar-09 13:23

2-Mar-09 13:23

Try again with the correct string Smile | :)

Regex reg = new Regex("( \|\| )|( && )");

Hogan