Re: problem with calling folderbrowingDialog in a child thread. - C# Discussion Boards

Luc Pattyn2-Jun-11 9:31

2-Jun-11 9:31

Frankly I don't know these things, I know quite a bit about serial ports, but not about modems.

Setting up a connection is what a modem should be capable of, so I expect it known about dual-tone multi-frequency dialing. I have no idea why you would want more tones once the connection got established, and I don't know whether a modem could generate more tones when connected; I do know my phone can: if I press a button in the middle of a conversation, you can hear the DTMF.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

The quality and detail of your question reflects on the effectiveness of the help you are likely to get.
Please use <PRE> tags for code snippets, they improve readability.
CP Vanity has been updated to V2.3

modified on Friday, June 10, 2011 8:44 PM

Re: Serialcomm dialing voice over modem

Chuck Richards3-Jun-11 3:13

Chuck Richards

3-Jun-11 3:13

Ohhhhhhhhhhhhh,...
Sorry. I meant to imply that once the application dials a phone number, has a delay (so it can dial extensions) it plays a wav file to the mailbox it dials. So it simply calls an IVR here at the office and leaves someone a voice mail. The wav played is not DTMF but a voice that we choose.

Re: Serialcomm dialing voice over modem

Chuck Richards2-Jun-11 9:22

Chuck Richards

2-Jun-11 9:22

PS, I gave 'good answer' Smile | :)

Re: Serialcomm dialing voice over modem [modified]

Chuck Richards2-Jun-11 7:34

Chuck Richards

2-Jun-11 7:34

Reply to my own message is what I want.

I want to find the best voice modem out there (but it is ok to have some short comings as it seems there is no clear winner). What are your thoughts as per voice modems? I'm not concerned over flash-hangups (line switch) but mainly want to be able to send wav's to a modem to play after dialing and navigating through an IVR. So I can conquer the initial menu navigation with delays in the ATD command but after that simply need to leave a message (internal alert type system from server).

any recommendations on the optimal voice modem?

modified on Thursday, June 2, 2011 2:54 PM

problem with calling folderbrowingDialog in a child thread.

prasadbuddhika30-May-11 6:25

prasadbuddhika

30-May-11 6:25

in a child thread i'm calling folderbrowsing dialog , i get the exceptiuon and , i got some articles saying i must use STAThreadAttribute attribute for the main method , i did that and the result was the same
"Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it. This exception is only raised if a debugger is attached to the process."

i tried

inthrd.SetApartmentState(System.Threading.ApartmentState.STA);

too but still the same result. can any one have any idea about this.
thanx in advance.

Re: problem with calling folderbrowingDialog in a child thread.

Luc Pattyn30-May-11 6:45

Luc Pattyn

30-May-11 6:45

I don't know all the details, however here are some facts:
1. you can set the apartment state only once;
2. IIRC you can't set it at all on ThreadPool threads;
3. I don't recall what happens if you try and ignore #1 or #2.
4. the easiest way to solve such problems most often is to do all user interaction on the main (aka GUI) thread.

BTW: when referring to some error message or exception you should paste it verbatim in your question.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

Re: problem with calling folderbrowingDialog in a child thread.

prasadbuddhika30-May-11 15:10

prasadbuddhika

30-May-11 15:10

thanks,actually what i'm doing is creating a new window in the child thread, so in that window i want to open this folderbrowsingdialog, so at that point i get the exception.
and following is the exception i got

Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it. This exception is only raised if a debugger is attached to the process.

thanks in advance.

Re: problem with calling folderbrowingDialog in a child thread.

prasadbuddhika30-May-11 15:30

prasadbuddhika

30-May-11 15:30

thanks again . i found the issue , i'm using a separate class for creating threads in the application , and i had set the

l_thrd.SetApartmentState(ApartmentState.STA);

out side that class , when i moved this line into that thread creating class i got my problem solved. but i really don't know difference the two places i used the code
thankx .

Re: problem with calling folderbrowingDialog in a child thread.

BobJanova30-May-11 22:33

BobJanova

30-May-11 22:33

It is generally a bad idea to create UI on child threads, particularly if those threads are doing any data processing. The modal stack for different threads is separated, so (for example) message boxes and dialogs from a child thread won't interact as you expect with the main thread. A modal dialog is better than normal forms because you don't need to add a message pump to the thread but it's still not recommended in most situations. (For example, what if two threads want to ask the same question at the same time?) Have you thought about why you want to do this?

Re: problem with calling folderbrowingDialog in a child thread.

Shameel31-May-11 1:01

Shameel

31-May-11 1:01

It is always a best practise to limit your user interaction to the main GUI thread. Modal windows are modal only to the thread they're created on and not modal to the entire process as one would expect.

OleDbDataReader - reading order

Islorvat30-May-11 4:21

Islorvat

30-May-11 4:21

Hi guys,

I've searched google but didn't find anything regarding this issue. I'm updating an MS Access table after reading some fields from the same table. While doing this i have a label to check how many rows have been processed out of total and i see that the reader jumps from an ID to another, process a few rows then comes back to the ID before jump happened. Is this thing normal?
The table is created from an imported text file using Access.Application.DoCmd.TransferText. I thought compacting the database after import will fix this, but didn't. Any ideas?

Thank you!

Re: OleDbDataReader - reading order

Luc Pattyn30-May-11 5:43

Luc Pattyn

30-May-11 5:43

IMO a database is not supposed to obey a specific order, unless you specify one. Ultimately if you don't specify an order, the results could be different each time. I always specify an order before the user gets to see the data, so he shouldn't get any surprises here.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

Re: OleDbDataReader - reading order

Islorvat30-May-11 6:36

Islorvat

30-May-11 6:36

It just didn't cross my mind to order by ID. Smile | :)

Thanks!

Re: OleDbDataReader - reading order

Luc Pattyn30-May-11 6:39

Luc Pattyn

30-May-11 6:39

You're welcome.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

How to Create Rectangle

Anubhava Dimri30-May-11 1:27

Anubhava Dimri

30-May-11 1:27

Hello Experts,

I have found a very good project for drawing CAD project. But in this article i have very confusion but there is not any reply for my questions. So i m putting my question here.

I have generate the problem while creating the Rectangle Object.

OpenS-CAD, a simple 2D CAD application[^]

So please help me for that..

Thanks

If you can think then I Can.

Re: How to Create Rectangle

OriginalGriff30-May-11 3:15

OriginalGriff

30-May-11 3:15

The article is four years old.
Your question on the article was 4 hours ago.
Give it time...

Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.

Manfred R. Bihy: "Looks as if OP is learning resistant."

Re: How to Create Rectangle

Abhinav S30-May-11 4:22

Abhinav S

30-May-11 4:22

Give a chance for the author to atleast look at it.

The funniest thing about this particular signature is that by the time you realise it doesn't say anything it's too late to stop reading it.

Re: How to Create Rectangle

Anubhava Dimri31-May-11 19:23

Anubhava Dimri

31-May-11 19:23

Sure sir

If you can think then I Can.

Combobox displayMembers with .dbml objects

grmihel230-May-11 0:27

grmihel2

30-May-11 0:27

Are there any genius way to make Display and value member object related to the object in the combobox?
As you can see in the following code, I'm using IEnumrable of Email objects to add into the combobox, and the Email are an entity object related to the LinQ (.dbml) object mapped from the database (which means each object itself contains value fields from the database).

comboBox_n1.Items.Clear();
comboBox_n1.Items.AddRange(_controller.getEmailList().ToArray<Email>());
comboBox_n1.Sorted = true;
comboBox_n1.SelectedIndex = -1;

Right now it shows an object string like: 'MyApp.Email' for each object in the list.
Before now, I have made a ToString() in the .dbml code, for each object which ofcause works, but it ain't a sustainable solution since it will dissapear each time I made a change to the datamapper.

So are there any way to auto generate these display members??

Re: Combobox displayMembers with .dbml objects

phil.o30-May-11 1:13

phil.o

30-May-11 1:13

Hi,

You can put your ToString() method in a separate file, making use of the 'partial' keyword in the class declaration.
So, when you regenerate your model, your separate file won't be impacted by the changes, therefore your tweak will still work.
Hope this helps.

Regards.

Re: Combobox displayMembers with .dbml objects

grmihel230-May-11 2:09

grmihel2

30-May-11 2:09

Thanks, that will work for sure.
But it still feels like some kind of 'hack' in the structure. Ain't there any official way to do it, like 'click here and choose which data field to be shown as display member', for non-DataSources (like generic lists)??

Re: Combobox displayMembers with .dbml objects

Dave Kreskowiak30-May-11 4:16

Dave Kreskowiak

30-May-11 4:16

grmihel2 wrote:
Ain't there any official way to do it, like 'click here and choose which data
field to be shown as display member'

No, there is no "offical" way to do it. Based on your requirements, the suggestion given is the best one to go with. Use a Partial class and put the code that cannot change into a seperate file.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Re: Combobox displayMembers with .dbml objects

grmihel230-May-11 21:35

grmihel2

30-May-11 21:35

Just realized that I've never used the partial function before, so I'm not sure how to attack it. Could you gief an example plz?

I have a CRUD (Create, Read, Update, Delete) class for handeling all the email specific methods like:
public Email GetAllEmails(){}

The Email class is within the DataClass Datacontext, and thats the one who is getting regenerated each time I have a db scheme change.

Could you give an example of how to make this partial class for a ToString() for the Email class?

Here is a short outtake of the CD (Class Diagram): http://imageshack.us/photo/my-images/36/classdiagram.jpg/

Re: Combobox displayMembers with .dbml objects

Dave Kreskowiak31-May-11 1:54

Dave Kreskowiak

31-May-11 1:54

Simple. It's a class that get split into multiple files. One of them has to have the normal class definition. The others all continue the class code inside a partial class definition.

C# Partial Class[^]

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Re: Combobox displayMembers with .dbml objects

phil.o2-Jun-11 22:05

phil.o

2-Jun-11 22:05

Hi,

Sorry for this late reply but I was on vacation these days.

First, you have to make sure that generated classes are all defined with partial keyword.

For example :

// Auto-generated file
public partial class DataClass
{
   //...

   public partial class Email
   {
      //...
   }

   //...
}

Then, just add a Whatever.cs file to your project :

// Custom file. This will never be modified when you regenerate your model.
public partial class DataClass
{
   //...

   public partial class Email
   {
      public override string ToString()
      {
         //...
      }
   }

   //...
}

You could also define an extension method for you Email class : just add an Extensions.cs file to your project and define an extension method to the Email class.

public static class Extensions
{
   public static string ToString(this Email email)
   {
      //...
   }
}

Hope this helps. Kindly.

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