the problem with creating a duble buffer transparent control - C# Discussion Boards

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Re: VC# - Drawing an Image to a Control

CKnig20-Dec-07 22:25

CKnig

20-Dec-07 22:25

I guess the PictureBox get's an Invalidated message after you painted in it's client-area - so it just did what it should do after it's client-area got invalid - it painted it's internal image in it - and so undid your changes.

Even if your code worked - everytime the picturebox would repaint itself your changes would be gone.

How to implement a VMR9 filter to render images from camera to large DLPTV

sheeja_a_l20-Dec-07 19:31

sheeja_a_l

20-Dec-07 19:31

Hi
I need to render images coming from an IP camera to DLP TV using VMR-9 filter. Is there any knows about it please give me the idea.

Thanks in Advance

Sheeja.

Re: How to implement a VMR9 filter to render images from camera to large DLPTV

Stevo Z20-Dec-07 21:58

Stevo Z

20-Dec-07 21:58

Hi,

this is the link[^] you can learn more about these things

hope that helps

zilo

Re: How to implement a VMR9 filter to render images from camera to large DLPTV

sheeja_a_l20-Dec-07 22:03

sheeja_a_l

20-Dec-07 22:03

Thanks for your reply.

Related to button control

amit_8320-Dec-07 19:25

amit_83

20-Dec-07 19:25

Hi,
i have a button on my form.and i want Rounded border at all sides of button.so how can i do that.

amit

Re: Related to button control

Christian Graus20-Dec-07 19:36

Christian Graus

20-Dec-07 19:36

Look for controls that exist on this site, or write your own.

Christian Graus - Microsoft MVP - C++

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Re: Related to button control

Paul Conrad23-Dec-07 7:19

Paul Conrad

23-Dec-07 7:19

You can search for an existing one or just create one yourself.

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

the problem with creating a duble buffer transparent control

sunheart20-Dec-07 19:17

sunheart

20-Dec-07 19:17

I create a user control that shows some different pictures(it look like just animation ). Here the code :

Bitmap dblbuffer;
g1=Graphics.FromImage(dblbuffer);
g1.Clear(this.BackColor);
g1.DrawImage(bmp1,...);//maybe next time it will draw anothe picture

g.DrawImageUnscaled(dblbuffer,0,0);

When backColor is not transparent,it works well.
But if backColor is transparent,the problem appear.That is,it cannot appropriately draw background when to draw smaller picture after bigger one.

So, how to copy the appropriate portion of the image(or background) of parent control onto my control's own surface.

thanks a lot

Re: the problem with creating a duble buffer transparent control

sunheart20-Dec-07 19:23

sunheart

20-Dec-07 19:23

I mean that the code of "g1.Clear(this.BackColor)" dose not work well when BackColor is transparent.

To get and set Security permissions of a file or Directory in C#

Raheem MA20-Dec-07 18:58

Raheem MA

20-Dec-07 18:58

I want to get the security permissions of a file in C#, Can anybody help to get worked out this ? What are the classes shall We use to get or set the Security Permissions of a file using C# code.

I'm using .Net framework 1.0,

can anybody help?

Thanks in Advance,
SMARTech Smile | :)

Re: To get and set Security permissions of a file or Directory in C#

michaelvdnest20-Dec-07 20:57

michaelvdnest

20-Dec-07 20:57

Check out the FileIOPermission Class here[^].

Re: To get and set Security permissions of a file or Directory in C#

Giorgi Dalakishvili20-Dec-07 21:47

Giorgi Dalakishvili

20-Dec-07 21:47

Have a look at this website: Access Control List Editing in .NET[^]

#region signature
my articles
#endregion

Delete file

blackjack215020-Dec-07 18:55

blackjack2150

20-Dec-07 18:55

What is the easiest way to delete a read-only file?
I mean, is there a way, or do I have to reset it's read-only flag before I delete it?

Thanks.

Re: Delete file

Christian Graus20-Dec-07 19:03

Christian Graus

20-Dec-07 19:03

File.Delete doesn't work if it's read only ?

Re: Delete file

blackjack215020-Dec-07 19:11

blackjack2150

20-Dec-07 19:11

Christian Graus wrote:
File.Delete doesn't work if it's read only ?

Nope, it throws UnauthorizedAceesException. It came as a surprise to me, too.

Re: Delete file

michaelvdnest20-Dec-07 20:40

michaelvdnest

20-Dec-07 20:40

Remove the readonly attribute by using File.SetAttributes:

string file = @"C:\temp\somedir\somefile.txt";<br />
FileAttributes fileAtts = File.GetAttributes(file);<br />
File.SetAttributes(file, fileAtts & ~FileAttributes.ReadOnly);<br />
Directory.Delete(@"C:\temp\somedir",true);

Problem with previleges with fileInfo/directoryInfo objects for moving a file

rajesh4u20-Dec-07 18:04

rajesh4u

20-Dec-07 18:04

Hi,

We have a situation where we need to 'move' a file from one location to another. We are using the moveTo method of fileInfo class for this. But the issue with this is that when we execute it, the file, after it has been moved to the destination folder retains the previleges of the source folder whereas it should have gotten the previleges of the destination folder. copyTo method of the same object does not have this problem.

One alternative is to use the copyTo method and then delete method but that becomes a little risky and we do not want to go that route.

Any ideas how we could acheve 'moving' a file in VB.NET without using the fileInfo.moveTo()?

we are using .Net 1.0

Responses will be greatly appreciated.

Thanks in advance

Re: Problem with previleges with fileInfo/directoryInfo objects for moving a file

Raheem MA20-Dec-07 19:07

Raheem MA

20-Dec-07 19:07

Hi Rajesh,

I'm looking for the same , please let me know if you find any solution.

Thanks in Advance,
SMARTech Smile | :)

International Keyboard Input

rcollina20-Dec-07 17:20

rcollina

20-Dec-07 17:20

Hello everyone,

I'm wondering if there's a way to obtain user input without using a Form KeyDown event. I'm specifically looking for a method to get printable characters no matter which keyboard layout.

I'm developing an user interface for a graphical engine and I'm coding a textbox from scratch. I'm currently using GetKeyboardState, MapVirtualKeyEx and ToAsciiEx from user32, but sometimes I get odd repeated characters and I have no means to tell the repeated characters from the actual input.

Is there a managed way to get the same functionality?

Thanks in advance,
Rob

Re: International Keyboard Input

Paul Conrad22-Dec-07 9:17

Paul Conrad

22-Dec-07 9:17

Roberto Collina wrote:
if there's a way to obtain user input without using a Form KeyDown event

No, not without digging deep into the bios.

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Re: International Keyboard Input

rcollina24-Dec-07 4:46

rcollina

24-Dec-07 4:46

Thank you for your reply. I'm sorry to hear since this is going to be problematic. I was pretty much sure I'd have eventually found a .net counterpart for the user32 methods I mentioned.

I'm curious to know how user interface developers in the .net era address to this issue. After all, text input is a basic feature.

Thanks again.

Re: International Keyboard Input

Paul Conrad24-Dec-07 4:51

Paul Conrad

24-Dec-07 4:51

Roberto Collina wrote:
I'm sorry to hear since this is going to be problematic.

I have always thought the OS takes care of any internationalization.

Roberto Collina wrote:
curious to know how user interface developers in the .net era address to this issue.

I wonder if there are any google groups that can shed light.

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

Re: International Keyboard Input

rcollina24-Dec-07 12:15

rcollina

24-Dec-07 12:15

Paul Conrad wrote:
I have always thought the OS takes care of any internationalization.

But it does. The scanToAscii method returns modifier-aware input. If you press shift and then a, you get "A". It's indeed very handy.
My main problem is that it behaves oddily. So, to reiterate, I was wondering how this can be done in a managed way - I don't care if it eventually boils down to those user32 calls. I think WPF has an Input.Keyboard class somewhere, I was looking for something similar for previous .net versions.

Still, thanks for your reply. I will check the google groups for info as well.

Regards.

LINQ to XML

Edmundisme20-Dec-07 16:19

Edmundisme

20-Dec-07 16:19

Hello,

Is there a way for me to use the cool LINQ syntax to query XML using VS2005? Or do I need VS2008 for that?

i.e.:

XElement xml = new XElement("contacts",<br />
                    from c in db.Contacts<br />
                    orderby c.ContactId<br />
                    select new XElement("contact",<br />
                              new XAttribute("contactId", c.ContactId),<br />
                              new XElement("firstName", c.FirstName),<br />
                              new XElement("lastName", c.LastName))<br />
                    );

Thanks!

Re: LINQ to XML

Judah Gabriel Himango20-Dec-07 16:24

Judah Gabriel Himango

20-Dec-07 16:24

There isn't a way to access this syntax in VS2005. You need VS2008 (such as the free Express edition) to do that.

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