GDI+ flicker when drawing to a panel - C# Discussion Boards

transfer files from server to client

pjay2314-Jun-05 1:34

pjay23

14-Jun-05 1:34

how do i transfer files / folders from one server to client without ftp

Re: transfer files from server to client

Christian Graus14-Jun-05 1:37

Christian Graus

14-Jun-05 1:37

Set the page heading to be of the required file type and stuff the file bytes into the request.

Christian Graus - Microsoft MVP - C++

delete unfected files

Member 182653314-Jun-05 1:24

Member 1826533

14-Jun-05 1:24

Hi,Sometimes when you want to clean an infected file from a virus you cannot do this ,so you must delete the infected file.....please I want to know when this happen so I must delete the file

Re: delete unfected files

Christian Graus14-Jun-05 1:31

Christian Graus

14-Jun-05 1:31

You're writing a virus checker in C#, or.... ???

Christian Graus - Microsoft MVP - C++

Re: delete unfected files

mav.northwind14-Jun-05 3:34

mav.northwind

14-Jun-05 3:34

Are you going to the same class as AristotleYu?
Lots of clueless people wanting to write a virus scanner in C#...
Sigh | :sigh:

mav

Desktop Icons

Sabry190514-Jun-05 0:51

Sabry1905

14-Jun-05 0:51

hi all
is there anyway in C# or using winAPI that can help me in arranging desktop icons on a small area in the middle of the desktop wallpaper or in more detail can i set the coordinates of each icon as i wish
thx all

query about retrieving data from varbinary types

G_Zola14-Jun-05 0:10

G_Zola

14-Jun-05 0:10

When using the "SQLServer" mode in web.config in ASP.NET, the session objects' values will be stored into an SQL server as varbinary data types....

What i am interested to know if there is a way to deserialize the varbinary data type back into the same session object as before......

Thanks

GDI+ flicker when drawing to a panel

JDUK13-Jun-05 20:18

JDUK

13-Jun-05 20:18

I have a panel inside a form im drawing to becuase the drawing space needs to be bigger than the form and the user needs to be able to scroll round the image using the form scroll bars..

i have used
SetStyle(ControlStyles.DoubleBuffer, true);
SetStyle(ControlStyles.UserPaint, true);
SetStyle(ControlStyles.AllPaintingInWmPaint, true);

to try and stop the flicker but it only works when the form itself is drawn to.
How do i get double buffering to work on the panel?

Thanks.

Re: GDI+ flicker when drawing to a panel

JDUK13-Jun-05 20:59

JDUK

13-Jun-05 20:59

This problem has been plauging me for weeks.... then a minuite i post this i stubmle across the solution (more by luck than judgment) .. sods law, hey?
All sorted now thanks. Big Grin | :-D

Re: GDI+ flicker when drawing to a panel

Judah Gabriel Himango14-Jun-05 8:35

Judah Gabriel Himango

14-Jun-05 8:35

You care to post your solution? There are thousands of others with the same flicker problem.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Conversation With a Muslim
Judah Himango

Re: GDI+ flicker when drawing to a panel

JDUK14-Jun-05 12:40

JDUK

14-Jun-05 12:40

Yeah sorry about that...
I hate it when I search for a problem and the OP says "sorted" and it just dies right then and there, to.

So here goes:

My Drawing function looked like this(Though it has been drasticly cut down to the bare minimum for readability):

<br />
private void DrawMyStuff()<br />
	{<br />
	 System.Drawing.Graphics myGraphics;<br />
	 myGraphics = myPanel.CreateGraphics();<br />
	<br />
	 MyGraphics.DrawImage(myBitmap, x*Size,y*Size);<br />
	 MyGraphics.Dispose();<br />
<br />
	}<br />

My panels paint method looked like this

<br />
private void myPanel_Paint(object sender, System.Windows.Forms.PaintEventArgs e)<br />
	{<br />
         DrawMyStuff();<br />
	}<br />

I have since changed it to look like this:

<br />
private void DrawMyStuff(Graphics g)<br />
	{<br />
	 g.DrawImage(myBitmap, x, y);<br />
	 g.Dispose();<br />
	}<br />

<br />
private void myPanel_Paint(object sender, System.Windows.Forms.PaintEventArgs e)<br />
	{<br />
         DrawMyStuff(e.Graphics);<br />
	}<br />

I think my problem was re-assigning the graphics object every time and in a way bybassing the double buffering by recreating the drawing surface constantly.

Hope that helps some people...

Property with another name in the Designer

Trambert13-Jun-05 22:47

Trambert

13-Jun-05 22:47

Hello!

I've got a problem in Visual Studio 2005. I must create a derived class from TablePanelLayout, and also override or hide the herited member called "Columns" in the Designer, to add more functionalities like a minimum size..

The problem is that there is no property called "Columns" in the TablePanelLayout. Only a property called "ColumnStyles" but there still have a property in the Visual Studio Designer called "Columns". And like the property "Rows", it's opening a property editor for the columns/rows styles...

I'm supposing that there is an attribute or something special to describe these two "fake properties" bat i can't find it. I want to erase them, i don't want to have two properties called "Columns" in the designer...

Thanks for your help.
And i am sorry for my bad English lol I hope i was clear enough.

Re: Property with another name in the Designer

MoustafaS14-Jun-05 0:35

MoustafaS

14-Jun-05 0:35

You can use -in your derived class-:

public override ICollection Columns = null;

Re: Property with another name in the Designer

Trambert15-Jun-05 2:08

Trambert

15-Jun-05 2:08

It's ok... The property name in the designer was just remplaced ba the attribute
[DisplayName("Column")]

the original property is named "ColumnStyles" and it just have another name in the designer.

Thanks for your help!

contect menu: scan with me!

AristotleYu13-Jun-05 22:33

AristotleYu

13-Jun-05 22:33

Hi, how i can insert command in my context menu, so when i click on any file in windows and click context menu i see my command such clean, delete this item or scan it.
What i need exactly as what u see in winzip menu!

Re: contect menu: scan with me!

MoustafaS14-Jun-05 0:37

MoustafaS

14-Jun-05 0:37

This may be done by invoking the platform methods,try this site[^].

Re: contect menu: scan with me!

AristotleYu13-Jun-05 21:45

AristotleYu

13-Jun-05 21:45

can u provide more information about what u say, i dont understand!

return value from javascript in c#

Selva Kumar.S13-Jun-05 22:31

Selva Kumar.S

13-Jun-05 22:31

If I call a javascript using ButtonGo.Attributes["onclick"] = "MoreInfo()"; in c# code, can i return a value from javascript to use it in c# code again ?

Re: return value from javascript in c#

Christian Graus14-Jun-05 1:33

Christian Graus

14-Jun-05 1:33

Is this an ASP.NET question ? It's almost always a bad idea to mess with the jscsript that ASP.NET generates.

Christian Graus - Microsoft MVP - C++

Re: return value from javascript in c#

Anonymous14-Jun-05 7:59

Anonymous

14-Jun-05 7:59

What exactly are you trying to do?
What are you trying to return?
How are you going to use it?

--

Clean or Delete

AristotleYu13-Jun-05 22:23

AristotleYu

13-Jun-05 22:23

Hi,I write Antivirus program in c#.NET, and i have problem, i dont know when to decide when to CLEAN or DELETE virus when I found one, in another phase, when Antivirus go to DELETE choice.

Re: Clean or Delete

MoustafaS14-Jun-05 0:42

MoustafaS

14-Jun-05 0:42

try
{
   //Code to try clean;
}
catch(Exception ee)
{
   //Code to delete;
}

How to checkText Box value is a String or Float?

pubududilena13-Jun-05 22:13

pubududilena

13-Jun-05 22:13

hi all,
How to check value of a Text Box is a String or Float?

this.textBox4.Text

I want to check above value is a String Value or Float Value..
please help..

Thanks in advance.

Re: How to checkText Box value is a String or Float?

Daniel Monzert13-Jun-05 22:48

Daniel Monzert

13-Jun-05 22:48

In a short I can only tell about the "dirty" way..

bool isFloat = false;
float value = 0f;

try
{
value = float.Parse(this.textBox4.Text, System.Globalization.NumberStyles.Float);
isFloat = true;
}
catch
{
// isFloat is not set to true so it's not a float value.
}

By trying to parse the input text as float, you can determine wether the input is a valid float as string or not. If not, an exception will be thrown upon "float.Parse(string)" and isFloat will not be set to true.

Someone correct me, if I missed something on that example *cough* Smile | :)

Daniel Monzert

Re: How to checkText Box value is a String or Float?

jjansen13-Jun-05 23:06

jjansen

13-Jun-05 23:06

Zarrab wrote:
In a short I can only tell about the "dirty" way..

bool isFloat = false;
float value = 0f;

try
{
value = float.Parse(this.textBox4.Text, System.Globalization.NumberStyles.Float);
isFloat = true;
}
catch
{
// isFloat is not set to true so it's not a float value.
}

There is a neat way to do this: the static method Double.TryParse. You can bring it back to a float (or integer) afterwards if you want.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.