Re: My images are gone (c#) - C# Discussion Boards

Double Buffering API Theme paint problem

Tristan Rhodes2-Sep-04 1:52

2-Sep-04 1:52

I'm trying to double buffer DrawThemeBackground with a number of other custom drawings to prevent flicker.

The problem is, OpenThemeData is a handle to a window.
If i use a parent window as the handle to open the theme, the child paints fine.
The bitmap HDC value is valid. But if I try to use the HDC to draw directly to the bitmap using windows theme, it just doesn't render.
If i draw onto the bitmap using just conventional graphics comands, these draw.

It's really frustrating as I'm out of options really. I Can't just think of any other way to do this.

<br />
		private void CustomDrawThisControl(IntPtr pTHEME, Graphics g)<br />
		{<br />
			//Create Graphics handle<br />
			DBGraphics l_ClientDC = new DBGraphics(); <br />
			l_ClientDC.CreateDoubleBuffer(this.Width, this.Height);<br />
			IntPtr l_HDC = l_ClientDC.g.GetHdc();<br />
<br />
//....Panel Generation<br />
<br />
//....Drawing <br />
<br />
//Render<br />
l_ClientDC.Render(g);<br />
<br />
//Release graphics Handle<br />
l_ClientDC.g.ReleaseHdc(l_HDC);<br />
}<br />

I've used a modified version of norm.net's double buffering class. But it basicaly works the same.

If anyone has anymore ideas about this, i'd be appreciative.

Cheers

Cata

Re: Double Buffering API Theme paint problem

Werdna2-Sep-04 6:06

Werdna

2-Sep-04 6:06

Is this inside your custom control?
You can override from Control class and in constructor do:

SetStyle(ControlStyles.DoubleBuffer | ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true);

that way all drawing you do in OnPaint will be drawn to buffer and then painted, thus you'll avoid flickering.

Re: Double Buffering API Theme paint problem

Tristan Rhodes2-Sep-04 8:59

Tristan Rhodes

2-Sep-04 8:59

Yes, it's in my custom control.
I've tried this, but it makes the flickering worse and hides the icons and text that are drawn on top of it. This only happens when i'm drawing windows themes however, so i was going to manauly double buffer it first.

Any more ideas?

scroll bars in a picture box

gijoebijoe2-Sep-04 1:30

gijoebijoe

2-Sep-04 1:30

i have a simple application where i open a bitmap in a picture box,iadded near it a horizontal and vertical scroll bar.
How can i actually make the bars scroll through the picture in the picture box

thank you

Re: scroll bars in a picture box

Sebastian Schneider2-Sep-04 2:27

Sebastian Schneider

2-Sep-04 2:27

Ill just tell you the easy unsophisticated way:

In your form, insert a panel.

In that panel, insert a picture box.

set panel.autoscroll to "true".

Then you should have a "scrollable" image.

Cheers
Sebastian

Re: scroll bars in a picture box

Sebastian Schneider2-Sep-04 2:37

Sebastian Schneider

2-Sep-04 2:37

Like this:

...

this.panel1.Controls.Add(this.pictureBox1);

...

this.pictureBox1.Size = new System.Drawing.Size(pictureBox1.Image.Width,
pictureBox1.Image.Height);

this.panel1.AutoScroll = true;

...

These are the important lines.

The first line will add "pictureBox1" to "panel1" (it is now inside the panel)

The second line will set the pictureBox1.Size to the size of the loaded image.

The third line adds "AutoScroll" to the panel.

As soon as the panel is smaller than the image of the picturebox within, Scrollbars will appear.

Cheers
Sebastian

My images are gone (c#)

adnanh752-Sep-04 0:42

adnanh75

2-Sep-04 0:42

I have a problem with images in my application, I cant build them in.. it allways says:
************************************************************************************************
Eine nicht behandelte Ausnahme des Typs 'System.Resources.MissingManifestResourceException' ist in mscorlib.dll aufgetreten.

Zusätzliche Informationen: Für die angegebene Kultur (oder die neutrale Kultur) in der Assembly konnten keine Ressourcen gefunden werden. Stellen Sie sicher, dass 'Form1.resources' richtig in die Assembly 'NeckingRa' eingebettet wurde.
baseName: Form1 locationInfo: NeckingRa.Form1 resource file name: Form1.resources assembly: NeckingRa, Version=1.0.1706.20859, Culture=neutral, PublicKeyToken=null
*************************************************************************************************
Its in German, but someone maybe knews what is this about???
What should I do now? Please help me.
I am beginer so please explane it so I can understand Smile | :)

Re: My images are gone (c#)

exhaulted2-Sep-04 1:47

exhaulted

2-Sep-04 1:47

Are you using a setup project to deploy your app? if so just add the files to your setup project and tell it where to put them when you project gets installed. If not then you'll have to add them as resources.

Kev Pearman MCAD

Re: My images are gone (c#)

adnanh752-Sep-04 1:53

adnanh75

2-Sep-04 1:53

No, I am not creating a Setup..
Im still working on app..
I changed my code and added

public struct PointD
{
public double x;
public double y;
}
public struct node
{
public string Name;
public ArrayList Lstates;
}

and my images were gone..
Sigh | :sigh:

Re: My images are gone (c#)

exhaulted2-Sep-04 3:38

exhaulted

2-Sep-04 3:38

What images, you haven't shown any code with references to any images?
Show the code that references the images.

Kev Pearman MCAD

Re: My images are gone (c#)

mav.northwind2-Sep-04 3:46

mav.northwind

2-Sep-04 3:46

Adnan,
try putting your structs into separate files or after your class, this might help.

mav

Re: My images are gone (c#)

adnanh752-Sep-04 5:08

adnanh75

2-Sep-04 5:08

Done, it works, thanks mav Smile | :)

thanks

Re: My images are gone (c#)

exhaulted2-Sep-04 6:16

exhaulted

2-Sep-04 6:16

I guess that as long as it works i doesn't matter but
why would putting your structs inside a class throw the above exception?

Kev Pearman MCAD

Re: My images are gone (c#)

mav.northwind2-Sep-04 10:07

mav.northwind

2-Sep-04 10:07

Well, I've seen some strange things happen when I've added private classes to some of my form-derived classes. Dead | X|

Basically, the visual designer stores some resources in .resx files (for example image data).
These XML-based files hold serialized data that can be retrieved by an object name (just add a picture box to a form and than look at what's generated in InitializeComponent()).
If, by which means ever, such a resource cannot be found than the visual designer will choke and running the application will create an exception similar to what adnan wrote.
I think that he had introduced some naming conflicts, so removing the offending struct declarations from the .cs file fixed the way .NET accesses its embedded resource streams.

mav

Changing style of panel's scrollbar

SaravananPV1-Sep-04 18:51

SaravananPV

1-Sep-04 18:51

hi,
I want to change the color of the scrollbars(horizontal and vertical) that appear with panel control (when I set autoscroll true) .if anyone knows how to set different styles to scrollbars of a (container) control in C#, pl let me know..

Thanks

How to call an external .exe file from C#

pavanarza11-Sep-04 18:25

pavanarza1

1-Sep-04 18:25

Can any one help me out. I am trying to call an external .exe file whihc creates mpeg files in my project. Is there a efficient way to do so.
Thank you

pavan Smile | :)

Re: How to call an external .exe file from C#

Corinna John1-Sep-04 19:32

Corinna John

1-Sep-04 19:32

externalProcess = System.Diagnostics.Process.Start(exeName, parameters);
externalProcess.WaitForExit(1000);

help. Web Service

intrigued1-Sep-04 14:42

intrigued

1-Sep-04 14:42

Hey, Can anyone tell me how to use the Session and Application variables to distinguish between 2 users. I tried SessionID. Couldn't make it happen. Please help

Re: help. Web Service

Heath Stewart1-Sep-04 15:39

Heath Stewart

1-Sep-04 15:39

This question belongs in the ASP.NET forum.

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

[My Articles]

help. Web Service

intrigued1-Sep-04 14:42

intrigued

1-Sep-04 14:42

Hey, Can anyone tell me how to use the Session and Application variables to distinguish between 2 users. I tried SessionID. Couldn't make it happen. Please

Re: help. Web Service

Pradeep.S2-Sep-04 20:30

Pradeep.S

2-Sep-04 20:30

You must set the enable session property to true
ex: [WebMethod(EnableSession=true)]

Choose the appropriate sessionState in the web config file.
(The default is good enough for normal purpose)

Initialize ur session variable
ex: Session["test"] = ""; in the Session_Start of Global.asax

u can assign values to test variable in ur web service methods.

cool man

Zooming on bitmaps using C# coding

gijoebijoe1-Sep-04 13:26

gijoebijoe

1-Sep-04 13:26

I have a problem trying to zoom in on a bitmap i opened in a form.I couldnt find any simple code example that illustrates how to implement zooming from inside a program.I would appreciate if anyone can help me out.Please contact me at gehanmustafa@hotmail.com.

Yours,
Gehan Mustafa

Re: Zooming on bitmaps using C# coding

Christian Graus1-Sep-04 13:38

Christian Graus

1-Sep-04 13:38

gijoebijoe wrote:
Please contact me at gehanmustafa@hotmail.com.

No.

All you need to do is use DrawImage to draw the image at a larger than normal size.

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

ExecuteNonQuery returns -1

creganc1-Sep-04 9:34

creganc

1-Sep-04 9:34

Hi,
I'm having problems with issuing a SQL ExecuteNonQuery in my webService. It always returns an int with value -1.
I'm executing a stored procedure which should return a rowcount of the number of matching rows, which is 0 or 1. There is a matching row, so i should get 1 returned.

The code i am using is as follows:
--------------------------------------------------------------------------
string CnStr = "data source=localhost; Integrated Security=SSPI;Initial Catalog=Active";
SqlConnection sqlCn = new SqlConnection();
//Pass connection string to the SQLconnection object
sqlCn.ConnectionString = CnStr;
// Create a sqlcommand object to execute sql stored procedure
//pass query string and connection object to Command object
SqlCommand cmd = sqlCn.CreateCommand();
//Specify the Stored procedure to be executed
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "stp_Check";
//Create a Paramater object to provide input and return
cmd.Parameters.Add("@Mac", SqlDbType.Char,17);
cmd.Parameters["@Mac"].Value = strMAC;
//Open the connection
sqlCn.Open();
//Execute the query - return rowcount
int intMACAddressRows;
intMACAddressRows = cmd.ExecuteNonQuery();
-----------------------------------------------------------------------

If i execute the Stored procedure directly it works fine (i.e. one row is returned).
Thanks for any help you can give.

Cheers,
Colin

Re: ExecuteNonQuery returns -1

Charlie Williams1-Sep-04 10:31

Charlie Williams

1-Sep-04 10:31

Update, Insert, and Delete commands will return the number of rows affected. Anything else returns -1.

creganc wrote:
If i execute the Stored procedure directly it works fine (i.e. one row is returned).

I'm unsure whether you mean the row is returned or the count of rows affected is returned when the procedure is executed directly. If you mean the actual row is returned, it is a Select statement and the return value will always be -1.

Charlie

if(!curlies){ return; }

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