C# Discussion Boards - CodeProject

Re: Serializing an interface?

led mike9-Oct-06 10:31

led mike

9-Oct-06 10:31

Marc Clifton wrote:
Xml serialization supports serializing objects

Well I hate to point out the obvious but an interface is not a concrete object. Another approach could be custom serialization. Not very difficult.

led mike

Re: Serializing an interface?

Robert Rohde9-Oct-06 22:13

Robert Rohde

9-Oct-06 22:13

Hi,

first of all the serialization mechanisms of .NET don't serialize properties - they serialize fields. This is important because not everything which determines the state of an object is accessible via its public interface. Are you getting some kind of exception? If the property encapsulates a field it should work as long as the concrete class hanging in this field is marked with [Serializable].

Robert

Escape from image folder

Parshant Verma9-Oct-06 7:39

Parshant Verma

9-Oct-06 7:39

Hi i devlope a application in which i used a lot of png image files.i place the image folder ,where the exe is,.
this is also working in release mode .but whenever i place .exe file to desktop it demand for image folder.
i have to put image folder to destop.
How can i escape of putting the image folder to desktop.
Can i place all image file to solution explorer then what the path would if this time path is
btn_select_folder.BackgroundImage=System.Drawing.Image.FromFile(Application.StartupPath+@"\dbxpngs\002.png");

plase tell some solution

parshant

Re: Escape from image folder

Guffa9-Oct-06 9:41

Guffa

9-Oct-06 9:41

Why do you put the program on the desktop? Put a shortcut to the program on the desktop.

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Empty Crystal Report

WillemM9-Oct-06 7:12

WillemM

9-Oct-06 7:12

I don't know, but it seems the crystal reports doesn't like me or my computer or something, because I can't get the following simple scenario to work:

- I used strongly typed datasets in the application to build my model with
- I Added a couple of forms and used databinding to connect the datasets

This all works fine, so I created a crystal report to print some of the data.
It's a report with a parent child-relation in it, because I'm showing a delivery note with delivery items on it. I used the wizard, so I can assume that works out.

But when I run the app and try to print something using the report, I get an empty report from my printer. After two hours of searching and finding it out myself, I'm out of options.

The code to load and print the report is as follows:

Pakbon report = new Pakbon();<br />
<br />
report.SetDataSource(ds);<br />
report.PrintToPrinter(1, true, 0, 0);

WM.

What about weapons of mass-construction?

Re: Empty Crystal Report

WillemM9-Oct-06 21:05

WillemM

9-Oct-06 21:05

A short update on the problem.

I thought it had something to do with me using multiple related tables, but I was wrong. After trying one more time, this time with a single table for the report head and a single table for the report details, that didn't work out.

WM.

What about weapons of mass-construction?

Re: Empty Crystal Report

WillemM10-Oct-06 6:24

WillemM

10-Oct-06 6:24

Its weird, but I solved it. Crystal report doesn't seem to eat more than one table per report. So I created a view which merges the data from the different tables and used that in the report.

Now everything is fine and my shipping items are showing up in the subreport, but I still think it's weird that it isn't possible to use more than one table in the report.

WM.

What about weapons of mass-construction?

How could this not work?

nicknotyet9-Oct-06 6:40

nicknotyet

9-Oct-06 6:40

string str = (string)value;

int i = str.IndexOf(".");
str.Remove(i, 1);

Re: How could this not work?

nicknotyet9-Oct-06 6:44

nicknotyet

9-Oct-06 6:44

Because its not assigned to anything

I'm still thinking like a 'C' prgrammer.

Doh!

Re: How could this not work?

User 66589-Oct-06 7:12

User 6658

9-Oct-06 7:12

Remember strings in C# are immutable, so you need something like str = str.Remove(i, 1) if you want to modify a string.

regards

modified 12-Sep-18 21:01pm.

Re: How could this not work?

Guffa9-Oct-06 7:48

Guffa

9-Oct-06 7:48

It works just fine, it even creates the string that you want. It's only that you don't keep the reference to the string, so it floats around in heap limbo until it gets garbage collected. Smile | :)

So close... Wink | ;)

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keyup/keypress event for forms

jeweladdict9-Oct-06 6:38

jeweladdict

9-Oct-06 6:38

How would i go about assigning the F12 key to focus on a textbox within a form? Meaning when a form is active, if the f12 key is pressed (doesn't matter which component is active) the focus will be set to a certain textbox.

I know how to set the event when a certain component is active, but if i want to set a global keyup event, how would i do so?

Here is the code for a textbox keyup:

this.textBox_units.KeyUp += new System.Windows.Forms.KeyEventHandler this.textBox_units_EnterKeyPressed);

private void textBox_units_EnterKeyPressed(object sender, System.Windows.Forms.KeyEventArgs e )
{
if(( e.KeyCode == Keys.Enter ) || ( e.KeyCode == Keys.Return ))
{
this.textBox_upc.Focus();
}
}

Re: keyup/keypress event for forms

Stefan Troschuetz9-Oct-06 7:08

Stefan Troschuetz

9-Oct-06 7:08

"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook

www.troschuetz.de

Re: keyup/keypress event for forms

jeweladdict9-Oct-06 7:18

jeweladdict

9-Oct-06 7:18

works like a charm
thanks Big Grin | :-D

Setup creation VS2005

Charith Jayasundara9-Oct-06 6:19

Charith Jayasundara

9-Oct-06 6:19

Hi,

I want to create a setup for a C# application. After the installation the setup should be deleted. Do you have any idea about this?

Pls tell me how to do this Blush | :O

)

Thanks!

jayasshc

Re: Setup creation VS2005

Stefan Troschuetz9-Oct-06 7:16

Stefan Troschuetz

9-Oct-06 7:16

csecharithjayasshc wrote:
I want to create a setup for a C# application

There are many ways to accomplish this. E.g. you could use a Visual Studio setup project or a open-source tool like NSIS[^].

csecharithjayasshc wrote:
After the installation the setup should be deleted

Why would you do that? Maybe the user want to store the setup so he doesn't need to download it aganin if he wants to reinstall or use the app on another computer.

MS Access relationships manipulation

Juan Pedro Prez9-Oct-06 5:38

Juan Pedro Prez

9-Oct-06 5:38

Hi there,

I'm guessing if anybody knows how to manipulate Access relationships using the Microsoft.Office.Interop.Access package. What I'm trying to do is to deactivate the referencial integrity option (I hope it is so named in english) so I can change values that act as primary keys (I know, it's a bad idea, but we need to). Later, when primary keys are changed, I want to restore referencial integrity.

I've tried to manipulate the MSysRelationships table, but I have no read permission. I have also throughly reviewed the object model, but to no results.

Does anybody know how to achieve this?

Thanks in advance,

Juan Pedro Pérez

Getting primary keys from GetSchemaTable

il_masacratore9-Oct-06 5:15

il_masacratore

9-Oct-06 5:15

Hi!

I'm trying to get a table schema from a Oracle database. I've tried it doing a "select * " from the table and after using "GetSchemaTable" from the OleDbDataReader.

My problem is that it doesn't show me the primary key's. Help me!!

Printers installed on a remote PC

Mircea Puiu9-Oct-06 4:54

Mircea Puiu

9-Oct-06 4:54

Hello all!

Please help me understand the following "little" problem:
I'm trying to find the printers which another mashine in the network sees. For that, I'm using the following piece of code:

ManagementScope            ms = new ManagementScope("\\\\Someone\\root\\cimv2);
ObjectQuery                oq = new ObjectQuery("Select * from win32_Printer");
ManagementObjectSearcher   os = new ManagementObjectSearcher(ms, oq);

ManagementObjectCollection queryCollection = os.Get();

I mention that my permissions on the other pc are granted both for the CIMV2 and WMI
(as set through My Computer>Manage>WMI Control>Properties>Security)
If the installed printers are shared on the other computer, I see them, otherwise the queryCollection is empty. WHY?

PS: When querying anything else, it works with no problems (for example,win32_Product).

Thanks for any comment!

SkyWalker

Populating HTML fields in a AxWebBrowser

kozu9-Oct-06 4:40

kozu

9-Oct-06 4:40

Hi,
I have a AxWebBrowser control in a dialog and I would like to populate same fields of the HTML page hosted by it when it comes up.
For example, if I want to browse to the Yahoo email page, I'll put

axWebBrowser1.Navigate("https://login.yahoo.com/config/mail?.intl=us");

but I would like to set the user name in the Yahoo ID field.
Any ideas on how to do that?
thanx

Re: Populating HTML fields in a AxWebBrowser

led mike9-Oct-06 6:03

led mike

9-Oct-06 6:03

kozu wrote:
Any ideas on how to do that?

Use the DHTML interface, the Document I think.

led mike

Find Application Environment at runtime

pranu_139-Oct-06 4:38

pranu_13

9-Oct-06 4:38

Hi all,

How can i know the application environment at runtime?

i.e whether the application is run from Visual Studio IDE or an Exe.

Can we determine the application mode programmatically at runtime.

Thanks,

Pranu

Re: Find Application Environment at runtime

S. Senthil Kumar10-Oct-06 2:59

S. Senthil Kumar

10-Oct-06 2:59

Did you try using the System.Diagnostics.Debugger.IsAttached[^] property?

Regards
Senthil [MVP - Visual C#]
_____________________________
My Blog | My Articles | WinMacro

Re: Find Application Environment at runtime

pranu_1311-Oct-06 20:36

pranu_13

11-Oct-06 20:36

System.Diagnostics.Debugger.IsAttached is what iam looking for?

Thanks for ur reply.

Pranu.

Cannot determine an efficient encryption Model

sleepless_b9-Oct-06 4:16

sleepless_b

9-Oct-06 4:16

I am building a server based (ASP) application in VS2005. Together with that, i have also built an accompanying small "Licencer" application to be used by the same person that performs the installation so as to create an encrypted file on the HD of the server.The encrypted file will maintain the variables under which the Application was licenced.

When the technician performing the installation runs "Licencer" he inputs the [Product Key], [number of max. concurrent users], [company name] and together with that, "Licencer" also retrieves from the server the [CPUID],[OS],[DATE]. Then, those data are combined in an XML Document which "Licencer" encrypts (using symmetric encryption) and stores in the HD of the server.

When the Application starts-up it will have to decrypt the file that "Licencer" created and check it against the current system variables to see if all things are ok. If not, should stop working (lock).

My question is how am i going to implement a secure model for the creation and safe strorage of the Symmetric Key on the server, in order for nobody to be able to use it from another application?

By reading various articles on symmetric encryption i found out that i can use DPAPI in order to encrypt the Symmetric Key in the Windows registry. That could work for me but how can i be sure that my application will be the only one that will be able to decrypt the DPAPI-encrypted string from the registry?

How will it be possible not to hard-code critical information?

Apart from these questions i am open to alternate ways of managing licencing information.

Thank you in advance. I wouldn't be posting this message but i have reached a dead end.

Vasilis

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