Re: How do I view a jpg without using Image.FromStream - C# Discussion Boards

Re: add property to Object OR String ....

DaveyM6915-Jun-10 4:17

15-Jun-10 4:17

You can create an extension method as has already been suggested but how do you expect to test for empty?
Unless ToString has been overridden to return string.Empty then obj.ToString() will never be empty.

namespace YourNamespace
{
    public static class ExtensionMethods
    {
        public static bool IsNullOrEmpty(this Object obj)
        {
            if (obj == null)
                return true;
            // Do your emtpy magical check here and return a bool indicating the result - I have no idea how!
        }
    }
}

Dave

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Binging is like googling, it just feels dirtier. (Pete O'Hanlon)

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Re: add property to Object OR String ....

jojoba201115-Jun-10 4:26

jojoba2011

15-Jun-10 4:26

it give these errors :

Error	1	Type expected

Error	2	; expected

Error	3	Invalid token '==' in class, struct, or interface member 
                declaration

Error	4	Type or namespace definition, or end-of-file expected

Plz Help !!!!!!!!!!!!

ActiveDirectory c# - WhoLockMe?

noamtzu0015-Jun-10 2:12

noamtzu00

15-Jun-10 2:12

Hello,
How I know Which computer locked my user?? Complicated?
Sombady knows ???
Thank-you.

Re: ActiveDirectory c# - WhoLockMe?

Dave Kreskowiak15-Jun-10 5:21

Dave Kreskowiak

15-Jun-10 5:21

You can't find that out. There is nothing in AD that logs or tracks that information.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

using c++ class dll in c#

kk.tvm15-Jun-10 1:27

kk.tvm

15-Jun-10 1:27

Hi friends

I have a c++ dll which contains a class named as CLog. How can i use above class in C# program

thanks in advance

-kk.tvm-

Re: using c++ class dll in c#

DaveyM6915-Jun-10 1:34

DaveyM69

15-Jun-10 1:34

If the C++ is .NET you can add a reference to the dll to your project and use the class directly.
If not, you will need to wrap it by recreating the functions of the class using the DllImport attribute[^].

Dave

If this helped, please vote & accept answer!

Binging is like googling, it just feels dirtier. (Pete O'Hanlon)

BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)

How do I view a jpg without using Image.FromStream

TimSWatson15-Jun-10 0:34

TimSWatson

15-Jun-10 0:34

Hey

Does anyone know how to view a jpg stored in a stream on a control such as a picturebox without having to first convert it to a BITMAP using Image.FromStream?

Thanx

Re: How do I view a jpg without using Image.FromStream

Luc Pattyn15-Jun-10 0:44

Luc Pattyn

15-Jun-10 0:44

why would one want that?

two ways:
1. save the stream to a file, then use Image.FromFile or PictureBox.Location
2. create your own JPEG decoder (the inverse of this[^], i.e. implement Image.FromStream yourself.

It doesn't make much sense to me.

Smile | :)

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Re: How do I view a jpg without using Image.FromStream

TimSWatson15-Jun-10 0:48

TimSWatson

15-Jun-10 0:48

Maybe I was a bit vague. I am recieving a stream of jpegs from a number of cameras. I want to show these on screen and I was wondering if there was a way of doing this without having to first uncompress the jpg using Image.FromStream as this is a slow process.

Re: How do I view a jpg without using Image.FromStream

Luc Pattyn15-Jun-10 1:04

Luc Pattyn

15-Jun-10 1:04

TimSWatson wrote:
Maybe I was a bit vague.

indeed.

TimSWatson wrote:
without having to first uncompress

when an image is visible on the display, you see individual pixels, hence it has been decompressed somehow somewhere. There is no way around that assuming a standard PC system is used. The only thing you could consider is creating your own JPEG decoder trading quality for speed; however you are likely to discover loosing quality is easier than gaining speed.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

Nil Volentibus Arduum

converting long value to datetime

prasadbuddhika14-Jun-10 23:55

prasadbuddhika

14-Jun-10 23:55

i'm communicating wiht a remote sever and i get a datetime as a long value, is there any method that converts the long to datetime directly...

Re: converting long value to datetime

Peace ON15-Jun-10 0:34

Peace ON

15-Jun-10 0:34

There is no any direct way to convert long value to datetime.

You need to first convert it to string then you can convert to datetime.

Try following code for the same...

DateTime dateTime;
if (DateTime.TryParse(input.ToString(), out dateTime))
{
    Console.WriteLine(dateTime);
}

HTH

Jinal Desai - LIVE
Experience is mother of sage....

Re: converting long value to datetime

Eddy Vluggen15-Jun-10 0:41

Eddy Vluggen

15-Jun-10 0:41

prasadbuddhika wrote:
i'm communicating wiht a remote sever and i get a datetime as a long value, is there any method that converts the long to datetime directly...

Depends on what encoded within that long-value. Is it a numerical representation of the date, like the number "12012002"? Or is it encoded as a number of days since a certain date?

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Re: converting long value to datetime

Pete O'Hanlon15-Jun-10 0:49

Pete O'Hanlon

15-Jun-10 0:49

Is the remote server returning you a Unix time by any chance? If so, you can convert it into a DateTime using:

DateTime localTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc).AddMilliseconds(unixTime).ToLocalTime();

This takes things such as Daylight Savings Time into account.

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Re: converting long value to datetime

Luc Pattyn15-Jun-10 0:50

Luc Pattyn

15-Jun-10 0:50

You need to make sure the number you have is a number of ticks, as defined by:
"(in .NET) time values are measured in 100-nanosecond units called ticks, and a particular date is the number of ticks since 12:00 midnight, January 1, 0001 A.D. (C.E.) in the GregorianCalendar calendar", so you may need a linear transformation;
You then can use the constructor new DateTime(long ticks)

PS: you do not need any string for this.

Smile | :)

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Re: converting long value to datetime

prasadbuddhika15-Jun-10 1:05

prasadbuddhika

15-Jun-10 1:05

thanx for your replies ..

the date given by the sever is in this format "20100615072733" , i found a method
DateTime.TryParseExact(), and i tried following way , "s" contains the date value string

dateTime = DateTime.TryParseExact(s, "yyyy/MM/dd hh:mm:ss tt", CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.None, out dateTime);

but still i get the default date.

any help on this ...!

Re: converting long value to datetime

DaveyM6915-Jun-10 1:15

DaveyM69

15-Jun-10 1:15

well, as the string doesn't have any / spaces or : characters it's not suprising.
Try:

DateTime dateTime = DateTime.ParseExact(s, "yyyyMMddhhmmss", CultureInfo.InvariantCulture, DateTimeStyles.None);

Dave

If this helped, please vote & accept answer!

Binging is like googling, it just feels dirtier. (Pete O'Hanlon)

BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)

Re: converting long value to datetime

prasadbuddhika15-Jun-10 1:21

prasadbuddhika

15-Jun-10 1:21

hey thanx Dave and all who helped me , exactly as u mentioned it works when the "/" are removed ... thanx..

Re: converting long value to datetime

Luc Pattyn15-Jun-10 1:34

Luc Pattyn

15-Jun-10 1:34

yeah, when they put Exact in a method name, you'd have to be extra careful.

Smile | :)

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Re: converting long value to datetime

OriginalGriff15-Jun-10 1:50

OriginalGriff

15-Jun-10 1:50

LOL!

Did you know:
That by counting the rings on a tree trunk, you can tell how many other trees it has slept with.

I thought singletons were "Evil"? [modified]

venomation14-Jun-10 23:21

venomation

14-Jun-10 23:21

I try not to use global values as I belive that dependancys can be designed in a way that it should be dependant on as few objects as possible howeever I am making a small game and require some behavioural structure and came up with this:

public sealed  class EnterMineAndDigForGold : IState<Miner>
    {
        static readonly EnterMineAndDigForGold _instance = new EnterMineAndDigForGold();

        public static IState<Miner> Instance
        {
            get
            {
                return _instance;
            }
        }

        public  void Enter(Miner owner)
        {

            if (owner.Location != LocationType.Mine)
            {
                //Change location if minor is not in the mine
                owner.Location = LocationType.Mine;
                Console.WriteLine("Walked into the mine");
            }
        }

        public  void Execute(Miner owner)
        {

            owner.AddToGoldCarried(1);
            Console.WriteLine("Picked up some gold");
            owner.IncreaseFatigue(1);
            Console.WriteLine("Getting more fatigued");

            if (owner.PocketFull)
            {
                //change state to visit bank
            }

            if (owner.IsThirsty)
            {
                //change state to get a drink
            }
        }

        public  void Exit(Miner owner)
        {
            Console.WriteLine(owner.GetType().Name + " Is leaving the mine");
        }
    }

Which I have been learning from an AI book have learnt so far.
Is this ok to do?

modified on Tuesday, June 15, 2010 6:10 AM

Re: I thought singletons were "Evil"?

Eddy Vluggen15-Jun-10 0:48

Eddy Vluggen

15-Jun-10 0:48

"Global variables" were considered "evil", mainly because of the abuse - Singletons are not inherently evil.

Imagine people setting boolean flags to simulate communication between parts of the application Smile | :)

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