Setting an object public property, protected by a security check - C# Discussion Boards

DELPHİ7 prepared project. NET How Can I Keep

ibrahim_2615-Aug-09 0:11

15-Aug-09 0:11

Hi I DELPHİ7 also prepared a project that I have. NET in any language, I need to bring. NET ten, I know C # project DELPHİ7 de yapılmıştır.Ben this project platforms for example, C # How do I move on, okay, I know two programming languages are opposite to each other in a way, but do not ever Even a simple transformation is sufficient to me. I know I could tell? I'm waiting for help from me can get this mail?

ibrahimdemir26@gmail.com

Thanks ...

Re: DELPHİ7 prepared project. NET How Can I Keep

OriginalGriff15-Aug-09 5:40

OriginalGriff

15-Aug-09 5:40

Sorry I don't understand any of your problem. Most of the words, yes, but the sentences are beyond me. Please try again.

Do not post your EMAIL address, unless you REALY like SPAM!

No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced.

This message is made of fully recyclable Zeros and Ones

Re: DELPHİ7 prepared project. NET How Can I Keep

Dave Kreskowiak15-Aug-09 6:47

Dave Kreskowiak

15-Aug-09 6:47

Your question is incomprehensible. If you're asking how to convert a Delphi project to one of the .NET lanugages, you have to rewrite the project from scratch. There is no conversion tool as far as I know.

A guide to posting questions on CodeProject[^]

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

Automate processing without button click?

spankyleo12315-Aug-09 0:03

spankyleo123

15-Aug-09 0:03

Hi,

I have a winform which checks for emails in outlook and downloads attachment (Excel sheet) and read/display the contents to the user. This is currently done on a button click event. Is it possible to do this task without the user having to click on the button.ie each time a new email arrives the application automatically downloads the attahment , reads/displays the contents to the user?

The button click code is like this

private void button1_Click(object sender, EventArgs e)
{
Class.DownloadAttachment();
Class.Process();
}

Thanks..

Re: Automate processing without button click?

Henry Minute15-Aug-09 0:37

Henry Minute

15-Aug-09 0:37

spankyleo123 wrote:
Is it possible to do this task without the user having to click on the button.ie each time a new email arrives the application automatically downloads the attahment , reads/displays the contents to the user?

It is possible, but is it desirable?
Would you want your work to be continually interrupted? It would become very irritating and would almost certainly result in people not wanting to use your software.

spankyleo123 wrote:
private void button1_Click(object sender, EventArgs e)
{
Class.DownloadAttachment();
Class.Process();
}

If DownloadAttachment() and Process() are static methods of a class called Class, your choice of 'Class' as a class name is a really, really bad idea.

Lastly you have posted quite a lot of question by now, this is good, don't stop posting, but in nearly all of your threads, that I have seen, you have been asked to put your code snippets in <pre></pre> tags, and you are still not doing so. Please use the tags to make your code more easily read.

Henry Minute

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Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

Re: Automate processing without button click?

spankyleo12315-Aug-09 2:05

spankyleo123

15-Aug-09 2:05

Thanks for your reply. I shall make a note of it every time I post some code snippets.
"Class" is just an example my actual Class is not named as "Class".

Re: Automate processing without button click?

spankyleo12317-Aug-09 7:43

spankyleo123

17-Aug-09 7:43

Hi , Is it possible to run the downloadAttachment method on a different thread , so that the users are not interrupted when the proces is runnin?

Setting an object public property, protected by a security check

pierpaolo paparo14-Aug-09 21:56

pierpaolo paparo

14-Aug-09 21:56

Hi,

I have an object that performe a security check before setting a property

Class Issue

string _status
string Status {

set {

if (Value == "urgent" && current.User.IsManager)
_status = "urgent"
else
throw exception

}

get { return _status}

}

The problem arise when I just need to fill the status property from data coming from the Database.
Is there any proper OO way to leave the business logic in the object while allowing at least the db layer to fill this proerty?
At the moment, I have a IssueManager that is responsible to execture CRUD methods on the DB on behalf of Issue.

Thanks

Re: Setting an object public property, protected by a security check

Mycroft Holmes14-Aug-09 23:06

Mycroft Holmes

14-Aug-09 23:06

pierpaolo paparo wrote:
Is there any proper OO way to leave the business logic in the object

Probably not the correct OO way to do it, we use a bool flag bLoading to short circuit this problem.

Never underestimate the power of human stupidity
RAH

Re: Setting an object public property, protected by a security check

pierpaolo paparo14-Aug-09 23:53

pierpaolo paparo

14-Aug-09 23:53

Hi,

What would be the proper OO way?
How do you use the bLoading bool flag?

Pierpaolo

Re: Setting an object public property, protected by a security check

Mycroft Holmes15-Aug-09 0:39

Mycroft Holmes

15-Aug-09 0:39

Have a local bool bLoading default to true, when the constructor is completed set bLoading to false

In the status check put the following

if(bLoading){return;}

in the first line.

Never underestimate the power of human stupidity
RAH

Re: Setting an object public property, protected by a security check

Adam Maras14-Aug-09 23:47

Adam Maras

14-Aug-09 23:47

Have the IssueManager class create the Issue object by means of a constructor that doesn't do a security check. If, for whatever reason, that won't work for you, you could always default to using reflection to manually set the _status field after instantiating the object.

Adam Maras | Software Developer
Microsoft Certified Professional Developer

Re: Setting an object public property, protected by a security check

pierpaolo paparo14-Aug-09 23:54

pierpaolo paparo

14-Aug-09 23:54

Hi,
This could be a viable solution
Thanks

Re: Setting an object public property, protected by a security check

Adam Maras14-Aug-09 23:59

Adam Maras

14-Aug-09 23:59

No problem Smile | :)

Adam Maras | Software Developer
Microsoft Certified Professional Developer

Re: Setting an object public property, protected by a security check

PIEBALDconsult15-Aug-09 4:24

PIEBALDconsult

15-Aug-09 4:24

Yeah, a constructor that only the DB code uses.

Or maybe in serialization/deserialization code.

about the hashtable remove

elvis_pan14-Aug-09 16:12

elvis_pan

14-Aug-09 16:12

sample code :

Hashtable h0 = new Hashtable();
h0.add(0,10);
Hashtable h1 = new Hashtable();
h1.add(0,h0);

h1.Remove(0);
Question:
do i need to get the h0,remove the items in h0,then remove the h0 from h1?or just remove the h0?

Re: about the hashtable remove

Luc Pattyn14-Aug-09 16:53

Luc Pattyn

14-Aug-09 16:53

Hi,

no you don't need to dismantle an element that you want to remove from a collection.

BTW: you should consider using generic collections (such as Dictionary<T1,T2>), available since .NET 2.0; they are faster and safer.

Smile | :)

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PInvoke, varaible length arrays [Solved]

DaveyM6914-Aug-09 11:29

DaveyM69

14-Aug-09 11:29

I'm using some midi API functions that take a MIDIHDR structure.

[StructLayout(LayoutKind.Sequential)]
public struct MIDIHDR
{
    public IntPtr lpData;
    public int dwBufferLength;
    public int dwBytesRecorded;
    public IntPtr dwUser;
    public int dwFlags;
    public IntPtr lpNext;
    public IntPtr reserved;
    public int dwOffset;
    public IntPtr dwReserved;
}

lpData is a pointer to the data. This data is an array of MIDIEVENT structures

[StructLayout(LayoutKind.Sequential)]
public struct MIDIEVENT
{
    public uint dwDeltaTime;
    public uint dwStreamID;
    public uint dwEvent;
}

If I only have one element in the array I can use

int eventSize = Marshal.SizeOf(ev) * events.Length;
IntPtr eventPointer = Marshal.AllocHGlobal(eventSize);
for (int i = 0; i < events.Length; i++)
    Marshal.StructureToPtr(events[i], (IntPtr)((int)eventPointer + (eventSize * i)), false);

but I get Arithmetic operation resulted in an overflow when the second event is reached when playing the events (midiStreamRestart(handle)) if there is more than one element.

So, what's the best way to marshal an array of structures, and why doesn't the above work?

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)
Why are you using VB6? Do you hate yourself? (Christian Graus)

modified on Friday, August 14, 2009 6:20 PM

Re: PInvoke, varaible length arrays [modified]

Pete O'Hanlon14-Aug-09 11:44

Pete O'Hanlon

14-Aug-09 11:44

I suspect you'll have to decorate lpData with

[MarshalAs(UnmanagedType.LPArray)]
. Turn it into

[[MarshalAs(UnmanagedType.LPArray)] IntPtr[] lpData;
It's late here in the UK though, so my thinking may be a bit fuzzy here.

Ignore this - I hadn't noticed that lpData was pointing to MIDIEVENT, and this won't work in this situation.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

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modified on Friday, August 14, 2009 5:58 PM

Re: PInvoke, varaible length arrays

Luc Pattyn14-Aug-09 11:53

Luc Pattyn

14-Aug-09 11:53

I'm going to disagree. An array of structs just aggregates all the data in a single memory block,
it isn't an array of reference types, just one pointer to lots of data.

The Win32 function SendInput() is an example, in fact it is the example I got working some months ago.

Pete O'Hanlon wrote:
It's late here in the UK

I trust Dave has noticed that too. Big Grin | :-D

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Re: PInvoke, varaible length arrays

Pete O'Hanlon14-Aug-09 11:57

Pete O'Hanlon

14-Aug-09 11:57

I must admit, I didn't look at what lpData was pointing to, I just read the line that lpData was the array - I really should have read it through fully. You're exactly right - this code won't work, so I'm going to amend the post.

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As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

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Re: PInvoke, varaible length arrays

DaveyM6914-Aug-09 12:15

DaveyM69

14-Aug-09 12:15

Luc Pattyn wrote:
I trust Dave has noticed that too.

Yeah, my Mrs just pointed it out! Laugh | :laugh:

Re: PInvoke, varaible length arrays

Luc Pattyn14-Aug-09 11:46

Luc Pattyn

14-Aug-09 11:46

Hi Dave,

I have avoided such complexities till now, except for once, a rather simple variable array length.

Here are the results of the Antwerp jury:
In

[1]  int eventSize = Marshal.SizeOf(ev) * events.Length;
[2]  IntPtr eventPointer = Marshal.AllocHGlobal(eventSize);
[3]  for (int i = 0; i < events.Length; i++)
[4]      Marshal.StructureToPtr(events[i], (IntPtr)((int)eventPointer + (eventSize * i)), false);

There is something fishy about eventSize;
[1] is an attempt to compute the overall size; it may be correct, I am not sure, as Sizeof(ev) is the size of one struct and could be rounded up to a multiple of 16 or so, whereas an array would not contain padding bytes between elements.
And [4] treats eventSize as if it were the size of a single element, which it isn't. So that is probably the direct cause of your overflow.
Seems like you want to move the multiplication from [1] to [2].

FWIW: IntPtr will adapt to Win32/Win64 as you probably know; don't let it fool you.

Smile | :)

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Re: PInvoke, varaible length arrays

Pete O'Hanlon14-Aug-09 11:54

Pete O'Hanlon

14-Aug-09 11:54

Luc Pattyn wrote:
I have avoided such complexities till now, except for once, a rather simple variable array length.

That's why I use C++/CLI when I need to.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

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Re: PInvoke, varaible length arrays

Luc Pattyn14-Aug-09 11:56

Luc Pattyn

14-Aug-09 11:56

For me, that is just replacing one problem by another one, as I have almost zero experience with C++/CLI.

I prefer staying in charge of both sides (C# and native) and choose a simpler interface, one that does not need any marshaling at all.

Smile | :)

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