C# Discussion Boards - CodeProject

4-Apr-04 0:27

Vladimir Georgiev wrote:
// create a new bitmap from the Graphics object
Bitmap next = new Bitmap(myBitmap.Width, myBitmap.Height, g);

Dont do that! Just save "myBitmap"

^{top secret}

Re: GDI+

Vladimir Georgiev4-Apr-04 0:38

Vladimir Georgiev

4-Apr-04 0:38

Saving myBitmap does not save the rotated bitmap:

// file is a 24-bit .bmp file
Bitmap myBitmap = new Bitmap(textBox1.Text);

Graphics g = Graphics.FromImage(myBitmap);
g.RotateTransform(30);

myBitmap.Save("c:/documents and settings/vortex/Desktop/file123.bmp");

My main purpose is to open a bitmap, get some pixels from it, calculate the rotation degree based on those pixels, rotate and save the bitmap.

MSDN says that you could create a Graphics object from a bitmap, and vice-versa as well... But it does not work...

Any help is highly appreciated.

"Needless redundancy is the hobgoblin of software engineering." - Peter Darnell

Re: GDI+

leppie4-Apr-04 0:48

Grid programming question

4-Apr-04 0:48

Vladimir Georgiev wrote:
g.RotateTransform(30);

I think you are reading the function wrong. This just adjusts your "perspective" from a drawing point of view. IOW anything drawn after that will be "tilted".

Thats said do this:

Bitmap myBitmap = new Bitmap(textBox1.Text); 
Bitmap newb = myBitmap.Clone() as Bitmap;
Graphics g = Graphics.FromImage(newb);
g.RotateTransform(30);
g.DrawImage(myBitmap);
newb.Save("c:/documents and settings/vortex/Desktop/file123.bmp");

^{top secret}

Alex Korchemniy3-Apr-04 22:11

Alex Korchemniy

3-Apr-04 22:11

For all you grid programmers out there.

I'm working on a very simple grid solution and I have a question. I've seen some commercial products (Syncfusion) that have the ability to customize cells with customer cell models and renderers. One of the cells you can create is a custom control cell. The catch here is that the grid uses only one instance of the control to render all the cells that use that cell type.

I just need to know how to use a single instance of a control, reconfigure it for every cell with new cell data, and paint in different area of the grid control.

leppie3-Apr-04 22:26

3-Apr-04 22:26

AK wrote:
I just need to know how to use a single instance of a control, reconfigure it for every cell with new cell data, and paint in different area of the grid control.

Why on earth do you wanna "copy" there stupid design? Do it just like owner drawn menus, combobox's and type convertors. Using a control as a singleton in this situation is absurd , and most likely not even contained in the grid, and it methods are purely used for rendering. You dont need a control for that, just a static method in a class will suffice.

^{top secret}

Alex Korchemniy5-Apr-04 5:51

Alex Korchemniy

5-Apr-04 5:51

By the way, I've done quite a bit of grid before. Using a simple custom cell drawing is nothing new to me. I understand that I dont need a control to get the cell to pain properly. The reason I want to have a control is because I need a real control to interact with when the cell is focused.

I was hoping that someone knew how to "abuse" the painting code of the control to get the control to paint itself into a certain area of my grid without having to actually create a million instances of the control and aligning them to form a grid.

Ista4-Apr-04 15:40

4-Apr-04 15:40

Actually you extend the datagridColumn class. Once there you can override paint methods for drawing, add controls and use GetValueAtRow and SetValueAtRow.

www.syncfusion.com has a faq thats excellent for this

nick

I'm not an expert yet, but I play one at work. Yeah and here too.

How to remove data from a access dataset?

Alex Korchemniy5-Apr-04 6:51

Alex Korchemniy

5-Apr-04 6:51

I got it figured out. Thanks for trying guys.

A clue for others that need to do something similar. Use native methods. 1. Get WindowDC 2. Create compat bitmap 3. select the object 4. Send WM_PRINT message to window specifying the memory DC as the device context

MeterMan3-Apr-04 15:41

MeterMan

3-Apr-04 15:41

I want to remove a row from my database based on the instance of a title.
For example if i enter win32newb as the title it will filter the database to only include that row and delete it. Here is what i have in my code but it doesn't work. It throws an exception saying the current status is closed.

private void removebutton_Click(object sender, System.EventArgs e)
{

string strSQL = "DELETE * FROM Movie WHERE Title = ";
strSQL += searchbox.Text;

oleDbDeleteCommand1.CommandText = strSQL; //add the string to deletecommand
oleDbDataAdapter1.DeleteCommand = oleDbDeleteCommand1;
oleDbDeleteCommand1.Connection = oleDbConnection1;
oleDbDeleteCommand1.ExecuteNonQuery();

}

If you know of an easier method I'm open for suggestions. Anything that works pretty much. Thanks. Also, how would i make it where if the title that is entered doesn't exist it would not execute cause wouldn't that throw an exeception also if the title doesn't exist?

Thanks in again

Win32newb
"Making windows programs worse than they already are"

leppie3-Apr-04 21:17

3-Apr-04 21:17

win32newb wrote:
oleDbDeleteCommand1.Connection = oleDbConnection1

Best is to open and close the connection just before and after the "executenonquery".

win32newb wrote:
Also, how would i make it where if the title that is entered doesn't exist it would not execute cause wouldn't that throw an exeception also if the title doesn't exist?

Use a try/catch Smile | :)

^{top secret}

MeterMan3-Apr-04 21:52

MeterMan

3-Apr-04 21:52

thanks for the reply. I have a question maybe you or someone else can help with. Either my sql statement is not correct or something. I keep getting an exception because the catch keeps showing up.
I have a database with a table called Movie and it has fields Information and Title.
I have a test value in there called tony.
thanks for the help.

try
{

string strSQL = "DELETE * FROM Movie WHERE Title = ";
strSQL += searchbox.Text;
oleDbDeleteCommand1.CommandText = strSQL;
oleDbDataAdapter1.DeleteCommand = oleDbDeleteCommand1;

oleDbDeleteCommand1.Connection = oleDbConnection1;
oleDbDeleteCommand1.Connection.Open();
oleDbDeleteCommand1.ExecuteNonQuery();
oleDbDeleteCommand1.Connection.Close();

}
catch
{
MessageBox.Show("Not found");
}

Win32newb
"Making windows programs worse than they already are"

leppie3-Apr-04 22:12

3-Apr-04 22:12

win32newb wrote:
catch
{
MessageBox.Show("Not found");
}

replace that with:

catch (Exception ex)
{
MessageBox.Show(ex.Tostring());
}

You will get a MUCH better error condition, and if you dont know what to do with it, I'm sure many a person on CP will be able to help Smile | :)

^{top secret}

Re: Shockwave Movie in C#

MeterMan3-Apr-04 22:36

MeterMan

3-Apr-04 22:36

thanks i was wondering how to use that. i'm very new to this c# amazes me i konw this much haha.
anyway i got it working.
try
{

string strSQL = "DELETE FROM Movie WHERE Title = '" + searchbox.Text + "'";

oleDbDeleteCommand1.CommandText = strSQL;
oleDbDataAdapter1.DeleteCommand = oleDbDeleteCommand1;

oleDbDeleteCommand1.Connection = oleDbConnection1;
oleDbDeleteCommand1.Connection.Open();
oleDbDeleteCommand1.ExecuteNonQuery();
oleDbDeleteCommand1.Connection.Close();

}
catch (Exception ex)
{
MessageBox.Show("Not found");
MessageBox.Show(ex.ToString());
}

Win32newb
"Making windows programs worse than they already are"

Shockwave Movie in C#

Imad_4u3-Apr-04 15:15

Imad_4u

3-Apr-04 15:15

Dear Sir,
Ihope that this mail finds you in good shape. Well, the thing is that I am really very depressed and dishearted these days. I am a student doing my BS in Computer Science and next week I've to submit my c# project.

The onle problem I'm facing is that

!! HOW DO WE RUN a FLASH MOVIE in a C#SHARP APPLICATION?

I've tried everything. it gives an error.

Object Reference Not Set To an Instance of an Object.

Any Solutions,
Please send them to me

Truly Yours,
Imad

Imad

leppie3-Apr-04 21:13

.NET Framework Crashes!!!SWF

3-Apr-04 21:13

Just reference the FlashActiceX component.

^{top secret}

Imad_4u4-Apr-04 15:33

Imad_4u

4-Apr-04 15:33

The thing is that, I have already imported a Com Control by the name of Shockwave Flash Objects. but as soon as I embed and run this control in my C# Windows Application the .NET Framework Crashes.

Please help me out What should I do?

itsimad@hotmail.com
Imad

Imad

Creating a binary file

Ista3-Apr-04 9:04

3-Apr-04 9:04

I am trying to create a binary file but the binarywriter doesnt work and its a pdf so I believe it has to be true binary with no unicode style delimiters. Do I need to write c++ code in my assembly or does c# have a way?

Nick

I'm not an expert yet, but I play one at work. Yeah and here too.

leppie3-Apr-04 10:14

3-Apr-04 10:14

Ista wrote:
I am trying to create a binary file but the binarywriter doesnt work and its a pdf so I believe it has to be true binary with no unicode style delimiters.

What are your trying to write to a file? What is PDF, I thought u are writing a file. Why unicode appear in a binary file?

Ista wrote:
Do I need to write c++ code in my assembly or does c# have a way?
I think you need to look for Dorothy, the lion and the tin man, perhaps they can tell you.

^{top secret}

Nick Parker3-Apr-04 10:22

Nick Parker

3-Apr-04 10:22

leppie wrote:
I think you need to look for Dorothy, the lion and the tin man, perhaps they can tell you.

A little rough, isn't it? Poke tongue | ;-P

- Nick Parker
My Blog | My Articles

leppie3-Apr-04 11:14

3-Apr-04 11:14

Nick Parker wrote:
A little rough, isn't it?

Not rough enough it appears! Eek! | :eek:

^{top secret}

Ista3-Apr-04 10:43

3-Apr-04 10:43

I think dorothy would be of more assistance to you.

pdf is just text written to a binary file. The BinaryWriter writes in unicode which is standard in .net.

And when you write a file in .net it leaves unicode delimiters without special formatting.

Its really a simple question if you read it.

I need to create a binary file. How do you do that in c#. As of current I think c++ is the only way.

And yes the lion is someone with at least an advanced background with an understanding of files which hasn't read my question yet.

Nick

I'm not an expert yet, but I play one at work. Yeah and here too.

leppie3-Apr-04 11:01

3-Apr-04 11:01

Ista wrote:
pdf is just text written to a binary file

If you say so D'Oh! | :doh:

http://partners.adobe.com/asn/tech/pdf/specifications.jsp[^]

^{top secret}

Ista3-Apr-04 11:36

3-Apr-04 11:36

And yes the pdf code in which I have written was based on the document downloaded from that page.

and yes it is text file saved as a mac binary format.

If you know how to write a binary file I would really appreciate you telling me. I already know the fundamentals.

thanks,
nick

I'm not an expert yet, but I play one at work. Yeah and here too.

leppie3-Apr-04 11:47

3-Apr-04 11:47

Ista wrote:
and yes it is text file saved as a mac binary format.

Ahhh, now we getting some where Smile | :)

The problem u have is that the current file contains mac line endings (\r), and these just need to be converted to (\n\r). This could be as easy as using a TextWriter.WriteLine(TextReader.ReadLine()) to go thru the whole file (this works at least for Unix->DOS conversion).

Else you will have to feed the content into a string and replace all the occurances, and save it to a text file (not binary, that is used for saving primitives to a bytestream).

^{top secret}

Ista3-Apr-04 12:41