C# Discussion Boards - CodeProject

Re: Reg: Loading text file(size 100 MB) in Richtextbox

8-May-12 2:10

Member 2389379 wrote:
I am trying to load 100 MB of Text file in rich text box

Member 2389379 wrote:
anybody give the solution

stop trying that. Try some common sense.

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Pete O'Hanlon8-May-12 2:26

Pete O'Hanlon

8-May-12 2:26

Why are you trying to do this? It's highly unlikely that the user will read all that data - and those that do certainly won't do it in one massive window containing the whole file. Rather than trying to read all that data in, why not just retrieve a subset of that data and display the subset instead? That way, you can keep your application memory size down to a minimum, and give the user a much better text browsing experience.

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Re: Reg: Loading text file(size 100 MB) in Richtextbox

Dave Kreskowiak8-May-12 3:21

Dave Kreskowiak

8-May-12 3:21

Member 2389379 wrote:
I am trying to load 100 MB of Text file in rich text box

And you expected this to take how long? It'll probably take the RTB about a half hour to load all that, depending on content.

Member 2389379 wrote:
anybody give the solution for the above problem;

That's easy. Don't load 100MB into the RTB.

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Re: Reg: Loading text file(size 100 MB) in Richtextbox

Alan N8-May-12 4:31

Alan N

8-May-12 4:31

Yes, that is quite big and it suprising just how slow the AppendText/ReadLine combination actually is.

I think your best bet would be to use the LoadFile(filename, RichTextBoxStreamType.PlainText) method as it may manage memory more efficiently than AppendText/ReadToEnd.

By the way on my system a 100MB, 2,302,561 line file takes about 30 seconds to load using LoadFile. In contrast the AppendText/ReadLine method started about 15 minutes ago and according to TaskManager only 7MB has been read so far. The CPU is taking a remarkable beating for so little progress.

Alan.

Problem with dictionary

Mark Vloerjans8-May-12 0:52

Mark Vloerjans

8-May-12 0:52

Hi,

I've got an issue concerning dictionaries.

The situation is like this.

I've got a database with a table containing peoples and their functions. Now, I want a dictionary with the functions as key, and all the corresponding people in a IEnumerable-list as value.

So, something like this:

("Student", "Joe Palmer, Marc Speed, Scott Roberts")
("Teacher", "Felipe Bauer, Lewis Hamilton, Jenson Spencer")
("Administration", "Mike Stanford", "Philip Carrey")

Where the function is the key, and the names are the values. So the first element of the dictionary has "student" as key, and a collection of 3 names as value.

Could someone help me out with this? I've tried to accomplish this, but I keep on struggling... Frown | :(

Many thanks in advance!

Greetz,

Mark

Re: Problem with dictionary

Luc Pattyn8-May-12 2:16

Re: Problem with dictionary

8-May-12 2:16

go for a Dictionary<string, List<Person>>

The add operation takes a test, akin to:

public void add(string function, Person person) {
    // first make sure there is a list for the given function (create an empty one if necessary)
    if (!dictionary.ContainsKey(function)) dictionary.Add(new List<Person>());
    // now add to the list
    List<Person> persons=dictionary[function];
    persons.Add(person);
}

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Mark Vloerjans23-May-12 1:24

Mark Vloerjans

23-May-12 1:24

Thanks!

It was so simple when I saw your solution... Frown | :(

Re: Problem with dictionary

Luc Pattyn23-May-12 2:17

Registry.OpenSubKey Returns Null

23-May-12 2:17

You're welcome.

Smile | :)

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Kevin Marois7-May-12 11:30

7-May-12 11:30

I'm trying to read in a list of VS2010 Projects from the registry:

private const string VS_PROJECT_MRU_PATH = @"Software\Microsoft\VisualStudio\10.0\ProjectMRUList";

public static List<string> GetSubKeyNodeNames(BaseKey BaseKey, string SubKey)
{
    List<string> retVal = null;

    RegistryKey baseKey;

    if (SubKey != "")
    {
        baseKey = _GetRegistryBaseKey(BaseKey);
        baseKey = baseKey.OpenSubKey(SubKey, false);  //<===== FAILS HERE - basekey is null
    }
    else
    {
        baseKey = _GetRegistryBaseKey(BaseKey);
    }


    if (baseKey == null && SubKey != "")
    {
        throw new Exception("Registry subkey not found");
    }
    else
    {
        string[] names = baseKey.GetValueNames();

        retVal = (from n in names
                    select n).ToList();
    }

    return retVal;
}

I have verified that the key DOES indeed exist. I just doesn't open. The problem is similar to this[^] except that I'm reading from HKEY_CURRENT_USER, not HKEY_LOCAL_MACHINE.

Anyone know what;s going on here?

Thanks

Everything makes sense in someone's mind

JOAT-MON7-May-12 15:00

JOAT-MON

7-May-12 15:00

I don't know what's going on, but have you stepped through your function _GetRegistryBaseKey(BaseKey) to see why it returns null?

Jack of all trades ~ Master of none.

Richard MacCutchan7-May-12 21:56

Richard MacCutchan

7-May-12 21:56

Where is the method _GetRegistryBaseKey() defined and what value is it supposed to return?

Binding 100,000 items to a list box can be just silly regardless of what pattern you are following. Jeremy Likness

Kevin Marois8-May-12 7:29

8-May-12 7:29

Here it is. This part works.

private static RegistryKey _GetRegistryBaseKey(BaseKey BaseKey)
{
    RegistryKey key = null; ;

    switch (BaseKey)
    {
        case BaseKey.HKEY_CLASSES_ROOT:
            key = Registry.ClassesRoot;
            break;

        case BaseKey.HKEY_CURRENT_CONFIG:
            key = Registry.CurrentConfig;
            break;

        case BaseKey.HKEY_CURRENT_USER:
            key = Registry.CurrentUser;
            break;

        case BaseKey.HKEY_DYN_DATA:
            key = Registry.DynData;
            break;

        case BaseKey.HKEY_LOCAL_MACHINE:
            key = Registry.LocalMachine;
            break;

        case BaseKey.HKEY_PERFORMANCE_DATA:
            key = Registry.PerformanceData;
            break;
    }

    return key;
}

Everything makes sense in someone's mind

SledgeHammer018-May-12 8:01

SledgeHammer01

8-May-12 8:01

Works fine on my machine compiled as x86, x64 and Any CPU. Does your app run in restricted mode or is it a silverlight / web app or something? Does it run under a different user? Such as a service, web service, etc?

Seems like a security / permission problem to me.

Kevin Marois8-May-12 10:58

8-May-12 10:58

SledgeHammer01 wrote:
Seems like a security / permission problem to me.

That's what I thought, but I'm running as an admin, with no restrictions that I know of. It's a WPF app.

Everything makes sense in someone's mind

SledgeHammer018-May-12 11:23

SledgeHammer01

8-May-12 11:23

Do you have a try / catch hiding exceptions at some level? That method throws an exception on errors. Looking at the .Net source, the only way you should get a null is if the Win32 native function is returning an error other then security. Unfortunately, .Net hides the real error code from you. You might want to call the native RegOpenKeyEx through interop so you can get the real error code.

Richard MacCutchan8-May-12 8:13

Richard MacCutchan

8-May-12 8:13

Based on your previous message, this cannot be true, since you stated that the key returned from this method is null. You need to use your debugger to see what value is being passed in to your code in the first place.

Binding 100,000 items to a list box can be just silly regardless of what pattern you are following. Jeremy Likness

Kevin Marois8-May-12 10:57

8-May-12 10:57

I said OpenSubKey is returning False.

_GetRegistryBaseKey return the correct base key. Then the call to OpenSubKey returns False.

Everything makes sense in someone's mind

Richard MacCutchan8-May-12 21:27

Richard MacCutchan

8-May-12 21:27

Well my previous comment still stands; you need to use your debugger to check all values to determine why OpenSubKey() returns null. With the information you have provided it's impossible to guess what values exist within your application.

Binding 100,000 items to a list box can be just silly regardless of what pattern you are following. Jeremy Likness

Display Target Platform

AnneThorne7-May-12 6:19

AnneThorne

7-May-12 6:19

Hi,

I have done some searching for this and have not found exactly what I need.

I have created a Windows Application in C#, Dot Net Framework 2, for my company. It currently has a Target Platform of "any cpu".

The company is slowly migrating to use 64 bit machines. Also we would like to upgrade the Windows Application to Dot Net Framework 4.

Management wants to be sure that changing to an x86 target platform (this is the target platform that needs to be used for both x32 and x64 bit machines to run the application) and changing to Dot Net Framework 4, will not break anything.

So: For testing, I want to create 2 applications with the same source code.

1) (Using Visual Studio 2005 to build and publish): Current Visual Studio settings: Dot Net Framework 2, and Target Platform: any cpu

2) (Using Visual Studio 2010 to build and publish): Dot Net Framework 4, and Target Platform: x86

In a label on the application, I want to display the Dot Net Version (I know how to do that). Then I also want to display the Target Platform, which will either be : "any cpu" or "x86".

After searching the internet for about 15 minutes, I discovered how to differentiate between, x32 and x64; or perhaps between x32 and x86... This is by simply using the IntPtr.Size property.

But.. How would I differentiate between "any cpu" and x86. Or what if I wanted to differentiate between x86 and x64?

Thanks in advance for any advice anyone can give me with this.

Smile | :)

Anne

Jeremy Hutchinson7-May-12 6:52

Jeremy Hutchinson

7-May-12 6:52

The whole idea of the 'Any CPU' setting is that it runs on both x86 (32 bit) and x64 (64 bit). Unless you're running into a specific problem that can be resolved by selecting x86 or x64, you should probably leave that setting on Any CPU.

Now to answer your actual question:
If you build x86, you will then IntPtr.Size will be 4. If you build x64 IntPtr.Size will be 8. If you build Any CPU, IntPtr.Size will be 4 on 32 bit windows and 8 on 64 bit windows. So that won't help identify the Any CPU compiler setting.

So, you would need to create 3 project files (2 copies of the original), then add a Conditional Compilation Symbol in each of the project files. Then set the Label's text based on those symbols.

string platformTarget = "unknown";
#if x86
    platformTarget = "x86";
#elif x64
    platformTarget = "x64";
#elif AnyCPU
    platformTarget = "AnyCPU";
#endif
    lblPlatformTarget = platformTarget;

You can do something similar with comparing Framework 2 and 4. The upgrade from 2 to 4 should be completely painless.

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Apocalypse Now7-May-12 15:02

Apocalypse Now

7-May-12 15:02

any cpu:32 bit machine
x86: 32bit or 64 bit machine
x64: 64 bit machine

Luc Pattyn8-May-12 2:31

8-May-12 2:31

don't think so.

Hmmm | :|

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Apocalypse Now8-May-12 14:26

Apocalypse Now

8-May-12 14:26

x86 could run in x64 platform and x32 platform. I used.

Luc Pattyn8-May-12 14:56