C# Discussion Boards - CodeProject

Member 1206160028-Sep-15 20:25

28-Sep-15 20:25

" or you can simplify the code and just ask the user which they are going to use and go with normal SerialPort or File based code."

Exactly this was my point. Thank you

Member 1206160028-Sep-15 20:28

28-Sep-15 20:28

It means I will have to duplicate code right? There are various kind of read write and query methods means I will have to write each separately for File and Serial Port classes, so be it, this is not big issue I guess?

Eddy Vluggen28-Sep-15 5:50

Eddy Vluggen

28-Sep-15 5:50

user20044 wrote:
There is no SDK

They did when I had to interface with the HASP dongle. You'd first have to find out what you want exactly; write to a serial port, a USB or FileSystem. The C++ code is simply writing to a serial port.

You can do the same from C#, but may be easier to translate to managed C++[^]. Using those methods from C# is also possible, as shown here[^].

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

Member 1206160028-Sep-15 6:05

28-Sep-15 6:05

Well this code should be writing to both USB and file system, because if there is no physical HASP, there is also virtual HASP - which is just file - and that WriteFile can write both to USB(HASP) and file system, isn't it?

In C# code, can't I encapsulate such that if user chooses physical hasp, I use SerialPort class, and if not regular File methods? What do you think?

Eddy Vluggen28-Sep-15 13:24

Eddy Vluggen

28-Sep-15 13:24

user20044 wrote:
and that WriteFile can write both to USB(HASP) and file system, isn't it?

It can write to different ports as documented.

user20044 wrote:
In C# code, can't I encapsulate such that if user chooses physical hasp, I use
SerialPort class, and if not regular File methods? What do you think?

If you are trying to convert then go for the File methods. Not the regular ones, the API call that C++ executes.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

Member 1206160028-Sep-15 20:26

28-Sep-15 20:26

As noted above with Dave Kreskowiak I think best is to use File methods if user chose virtual hasp and use Serial.Port if this is physical HASP

Member 1206160028-Sep-15 6:30

28-Sep-15 6:30

This class Serial Communication in Windows[^] you linked is using exact same approach as code I posted isn't it?
It seems those methods can write both to serial(what I need) and file system.
So, I need C# equivalent.
Can't I do it with Serial.Port class when I need HASP access, and ordinary File methods when I need file system access? I understand I may need to duplicate code, but I think this is easiest for me. What do you think? Thanks.

Eddy Vluggen29-Sep-15 1:22

Eddy Vluggen

29-Sep-15 1:22

I don't think a file is a replacement for the dongle.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

Member 1206160029-Sep-15 1:48

How internet Download manager Works?

29-Sep-15 1:48

What do you mean? Like I said there are two options:
1. There is physical USB - HASP
2. Virtual HASP- which is just a file

So in 1st case I will use SerialPort, in the second, File methods.
Isn't it?

aahamdan26-Sep-15 8:05

aahamdan

26-Sep-15 8:05

Dear Expert,

What are the principles of Internet download manager?
How is it work?
I am thinking to develop program like it, what is the suitable language?

Regards,

Re: How internet Download manager Works?

BillWoodruff26-Sep-15 13:21

Re: How internet Download manager Works?

26-Sep-15 13:21

I've been a registered owner of IDM for (I think) over ten years, and it works very, very well. It is also a program that is updated almost every six-weeks because of the very complex business it does of integrating into all the popular browsers. What's even more remarkable: they've never asked me to pay for an update !

On the simplest level IDM is a manager for file-downloads, but that's like saying C# is a simple tool for making applications Smile | :)

It has too many other facilities and features to go into, here.

Unless you are seasoned developer with years of experience in dealing with Windows and in interaction with browsers, and a few years of your time to spend on this project, I suggest you think of another project to do.

«I want to stay as close to the edge as I can without going over. Out on the edge you see all kinds of things you can't see from the center» Kurt Vonnegut.

aahamdan13-Mar-16 4:19

aahamdan

13-Mar-16 4:19

Thank you

Re: How internet Download manager Works?

Afzaal Ahmad Zeeshan27-Sep-15 0:54

Afzaal Ahmad Zeeshan

27-Sep-15 0:54

What does the name suggests? Internet download manager. It simply manages the processes for file downloads or other downloads that you are trying to get.

As Bill has mentioned above, the job is not just to download the file from web resource, but also to ensure that the plugin is well integrated to all of the browsers. That is the actual tasks that they have to take care of. Downloading the resource is simply an HTTP client asking for a file download. But how does it know that a user wants to download something? That is the actual job of theirs.

For example, downloading a video from YouTube, Dailymotion or like downloading an audio file when it is played from the browser (all kinds of browsers). That is the complex task that IDM does for you. Anyone can download a file, just Right-clicking on that resource and selecting "Save as...". IDM does more than that! That is what makes it "The" Internet Download Manager. Smile | :)

The sh*t I complain about
It's like there ain't a cloud in the sky and it's raining out - Eminem
~! Firewall !~

Copare two different dataGridView

Member 1121917124-Sep-15 23:04

Member 11219171

24-Sep-15 23:04

Dear Sir/Madam

i want to compare two different datagridview with same column name with different row count.
i want to compare both and fine row count (how much row not exist in second datagridview) and row which is not ixist in second datagridview into array or its display on third seprate datagridview.
please help me to find solution as soon as possible.

Re: Copare two different dataGridView

OriginalGriff24-Sep-15 23:25

OriginalGriff

24-Sep-15 23:25

What have you tried so far?
Where are you stuck?
What help do you need?

Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...

Re: Copare two different dataGridView

J. Calhoun25-Sep-15 3:11

J. Calhoun

25-Sep-15 3:11

How are the datagrids populated? I am assuming they are built with a List<object>? Also if the object in the list has a field name, then foreach on both lists and compare a field like name.

// datagrid1 has objects from list1
// datagrid2 has objects from list2
foreach (CustomObject a in list1)
{
    if (!list2.Contains(a))
    {
        //It is not in the list so we want to make a note of it
        notIncludedList.Add(a);
    }
}
//How many rows in list1 don't exist in list2?
int num = notIncludedList.count;

Like Griff pointed out, we really don't have a lot to go on, so can you be more specific with what code you have that is not working, or give us a small snipet so that we can see what you are working with and help to resolve it?

Re: Copare two different dataGridView

Gerry Schmitz25-Sep-15 8:20

Gerry Schmitz

25-Sep-15 8:20

My suggestion is to compare the (records of the) "data sources" instead of trying to compare "grids".

How to implement Apriori using C# am new to C#

Member 1199820924-Sep-15 21:13

Member 11998209

24-Sep-15 21:13

Hello,

I am new to C# programming, I am doing Mini project on Apriori Algorithm using C# and I don't know from where I should start. Any one who willing to give me a guide to implement it and sample source code. I appreciate your help .

Thanks.

Re: How to implement Apriori using C# am new to C#

Garth J Lancaster24-Sep-15 21:35

Garth J Lancaster

24-Sep-15 21:35

you left 2 messages on this article Apriori Algorithm[^] - as far as I see, that article comes with source-code - so you have a working implementation to start with

A quick Google finds http://www.diva-portal.org/smash/get/diva2:344935/FULLTEXT01.pdf[^] and https://code.google.com/p/weka-dot-net/source/browse/trunk/Weka.NET/Weka.NET/Associations/Apriori.cs?r=47[^]

I understand its hard to start with, but use Google, do some searches and you should be able to find plenty more information

debugging strategy ? Linq query mis-match using de-serialized complex class

BillWoodruff24-Sep-15 12:53

Re: debugging strategy ? Linq query mis-match using de-serialized complex class

24-Sep-15 12:53

For me, debugging challenges are both the best and the worst experiences in programming; this one is a challenge I can "relish," since there's no deadline, no paycheck-on-the-line Smile | :)

I have a complex class that I serialize and de-serialize using WCF [DataContract] and [DataMember] Attributes without errors, or warning. In the test I've constructed to validate de-serialization are some Linq queries that when run against the de-serialized class instance come up with unexpected null results.

It appears I have Linq queries which give different results given identical inputs from which I assume, of course, that the problem is something subtle.

Here's an example of a query where the unexpected behavior (null result) is observed:

public IEnumerable<Relationship> GetRelationships(string n1, string n2)
{
    Node fromNode = NameToNode[n1];
    Node toNode = NameToNode[n2];

    return
        Relationships.Where(r => r.EndNode == fromNode && r.StartNode == toNode)
        .Concat
        (
           Relationships.Where(r => r.StartNode == fromNode && r.EndNode == toNode)
        );
}

// test: 
// finds two matches with graph before serialization
// Empty Result using de-serialized graph
var rels = testGraph.GetRelationships("gina", "harry");

What is puzzling is that some Linq queries work fine, like this one:

var wholikesjim = testGraph.Relationships.Where
     (rel => rel.Name == "Likes").Where(rel => rel.EndNode.Name == "jim"
     );

So far, I've done this:

0. (the obvious) inspected the serialized xml for "weirdness."

1. created a method to write all the various objects and their values to a TextBox, then compared the run-time report of the "native" version of the class instance to the de-serialized instance. The outputs are identical.

2. drilled down at run-time into the class instance using the debugger at the places where unexpected behavior occurs and noted the existing values/state of the various sub-objects when Linq queries are performed, then compared those before and after serialization/de-serialization.

The other queries which are not performing all use 'Join.

I'm stumped; I'll appreciate your ideas.

«I want to stay as close to the edge as I can without going over. Out on the edge you see all kinds of things you can't see from the center» Kurt Vonnegut.

Gerry Schmitz24-Sep-15 18:30

Gerry Schmitz

24-Sep-15 18:30

In the queries that work, you are comparing "strings" (values).

In the ones that don't work, you appear to be comparing "object references" (unless there is an overloaded operator at work somewhere).

Re: debugging strategy ? Linq query mis-match using de-serialized complex class

BillWoodruff24-Sep-15 22:20

Re: debugging strategy ? Linq query mis-match using de-serialized complex class

24-Sep-15 22:20

Valuable insight, Gerry,

Last night I had written an overloaded == operator for the Node Class, and that fixed one query, and just this morning (GMT +07 here), I rewrote (using foreach so I could inspect the internal state) one of the Linq queries that still doesn't compare Node instances consistently after the class is de-serialized.

As you suggest, I found the expected equality comparisons were not as expected.

The conclusion I reach is that after de-serialization what should be two references to the same Class instance are, in fact, references to two distinct Class instances that have identical properties.

So, today I will try and discover how that came to be.

thanks, Bill

«I want to stay as close to the edge as I can without going over. Out on the edge you see all kinds of things you can't see from the center» Kurt Vonnegut.

Gerry Schmitz25-Sep-15 8:28

Gerry Schmitz

25-Sep-15 8:28

Yes; curious ... one usually needs to take deliberate steps in order to clone another object; particularly if a deep clone is required.

(Except when there's a systemic anomaly in the matrix).

Re: debugging strategy ? Linq query mis-match using de-serialized complex class

Kenneth Haugland25-Sep-15 19:36

Kenneth Haugland

25-Sep-15 19:36

I'm kind of curious here. When are you interested in calling a clone to get a shallow copy? Id just create a pointer instead then, wouldn't you?

In making a deep copy always end up doing this:

Class MyClasss
    Implements ICloneable

    Private pName As String
    Public Property Name() As String
        Get
            Return pName
        End Get
        Set(ByVal value As String)
            pName = value
        End Set
    End Property

    Private pNAmes As New List(Of String)
    Public Property Names() As List(Of String)
        Get
            Return pNAmes
        End Get
        Set(ByVal value As List(Of String))
            pNAmes = value
        End Set
    End Property

    Public Function Clone() As Object Implements ICloneable.Clone

        Dim result As New MyClasss
        result = Me.MemberwiseClone

        ' If I have any properties of collection type
        ' I need to create a copy of each list 
        Dim TempNames As New List(Of String)
        For Each str As String In Names
            TempNames.Add(str)
        Next

        result.Names = TempNames
        Return result

    End Function
End Class

But I would sure like to know why the MemberwiseClone can't clone lists or collections like this. I also bet there is a more generic way of implementing it though.

Re: debugging strategy ? Linq query mis-match using de-serialized complex class

BillWoodruff26-Sep-15 1:11