user-specific registry entries - C# Discussion Boards

Re: Generating an activation code to enable use of an application

7-Jul-05 2:07

It's unlikely that many people will publish their approach to this, because they use it to protect their app. Look into the Cryptography namespace for ideas on established algorithms you can play with to come up with a way to create a code. If you do some sort of hash, never just use the users name, someone will work that out. Put some noise in there.

Christian Graus - Microsoft MVP - C++

Afzal Hassen7-Jul-05 2:43

Afzal Hassen

7-Jul-05 2:43

that makes sense...

thanks Christian Smile | :)

Afzal Hassen

Set up problem

ksanju10007-Jul-05 1:52

ksanju1000

7-Jul-05 1:52

Hi Is it possible to integrate set up file for my project and Windows Service in one set up file
Right now i have made set up files for both individual installer one for my projetc set up file and another set up files for Windows Service
pls tell me the procedure for that
Any help
Urgent
Thanks
Sanjeev

Re: Set up problem

WillemM7-Jul-05 3:29

WillemM

7-Jul-05 3:29

You could make a separate setup project and add all files to that setup.
I don't know how it works with the service installer, but you should be able to integrate that one into the setup as well.

WM.

What about weapons of mass-construction?

Re: Set up problem

ksanju10007-Jul-05 5:33

ksanju1000

7-Jul-05 5:33

hi WillemM,
Thanks for your reply.
Do u know how to add both set up file in one set up file
I have made two separate set up files
for both two project

thanks
sanjeev

Database connection

rovidiu7-Jul-05 0:28

rovidiu

7-Jul-05 0:28

Hi!
I'm beginer in visual c# and i have a big problem. Please explain me how to work with an acces database from c#. How to read articles from database, how to write and so on. Thank you!

Re: Database connection

Christian Graus7-Jul-05 2:10

7-Jul-05 2:10

Google[^] is your friend.

Christian Graus - Microsoft MVP - C++

Image Flicking

Rassul Yunussov7-Jul-05 0:21

7-Jul-05 0:21

I used in constructor of my panel next string:
SetStyle(ControlStyles.DoubleBuffer|ControlStyles.AllPaintingInWmPaint|ControlStyles.UserPaint,true);
And i Still see flicking...
And Another one question - how to make real double buffering...
For Example i draw very difficult figure on the screen, when i finished, another window covers it, anw on OnPaint message i need to redraw, i would like to get the same image( i've already drawn) on the screen... Something like reserve buffer, that doesnt't change, until i didn't change any data...

Christian Graus7-Jul-05 2:12

7-Jul-05 2:12

Every time your window gets changed in size, dispose and then recreate a bitmap the size of the screen. Draw your stuff to this bitmap when you do this. In your paint message, just draw the image unscaled to the screen.

Double buffering means to have two bitmaps like this, and to draw to one while the other is displayed.

Christian Graus - Microsoft MVP - C++

Rassul Yunussov7-Jul-05 9:16

7-Jul-05 9:16

I can't understand, do you know any links about this theme???
Because i got problems with it :
1) Flicking;
2) When i change the size of window it repaints only the old (small) part of window
3) Sometimes my control (Panel), where i draw repaint, then clears with background color...

Christian Graus7-Jul-05 13:23

7-Jul-05 13:23

If you look up double buffering on google, I'm sure there are plenty of C++ articles that explain the concept. It's really simple, you should draw the image direct to the Graphics object in your Paint handler, and you should have the image already drawn and ready to go.

When you resize your window, it's up to you to set up the drawing code to draw to the new size. Doing what I said will take care of this.

Don't use a panel, just draw the bitmap onto the window.

Christian Graus - Microsoft MVP - C++

Rassul Yunussov7-Jul-05 18:39

7-Jul-05 18:39

Yes i know this method, but it what image ("you should have the image already drawn ")i should draw?
I read that only controls can CreateGraphics...
Will it be the right way, if i dynamicly create a panel, but will not show it on the screen, draw on it, then copy image from it to my form???

Christian Graus7-Jul-05 18:51

7-Jul-05 18:51

Here is some pseudocode.

class MyForm
{

private Bitmap myBitmap;

MyForm()
{
InitialiseBitmap();
}

OnSizeChanged()
{
InitialiseBitmap();
Invalidate();
}

OnPaint()
{
e.gr.DrawImageUnscaled(myBitmap, 0, 0);
}

InitialiseBitmap()
{
if (myBitmap != null)
{
myBitmap.Dispose();
myBitmap = null;
}

myBitmap = new Bitmap(the size of your drawing window);

using (Graphics gr = Graphics.FromBitmap(myBitmap))
{
draw some stuff on the bitmap
}
}

Christian Graus - Microsoft MVP - C++

Coordinate System

Rassul Yunussov6-Jul-05 23:59

6-Jul-05 23:59

I want to make the start of OXY system coordinates not on the left-top, but left-bottom... Is it possible?

Re: Coordinate System

Christian Graus7-Jul-05 2:15

7-Jul-05 2:15

I'm not sure if there is a transform which does this. Either way, do you want this to work while drawing on a bitmap, for your entire Windows app, or what ?

Christian Graus - Microsoft MVP - C++

Re: Coordinate System

Rassul Yunussov7-Jul-05 9:21