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.NET security sample anyone? There's a good/short article from Code Project by "Manuel Permuy": http://www.codeproject.com/csharp/cryptography.asp
The sample illustrates how to encrypt/decrypt/retrieve certs using WSDK.
QUESTION: I can do all this without WSDK - using just System.Cryptography? I'm new to this and I am looking for nice/short .NET examples (otherwise, i'd be reading MSDN):
1. sign/hash/encrypt data
- both PPK and classic symmetric algo (DES for example).
2. Also want to know how to "publish" your public key so receiver decrypt payload and verify signature (in your sample, client and receiver on same machine/process.) So, am I talking about exporting key/key blob? A handle to a key is meaningless on a remote machine.
3. retrieve certificates from cert stores (covered in this article)
4. add cert (makecert.exe or MMC/3rd party: I'm alrite with this.)
Any good articles? I want to do this all .NET - but as you mentioned, you don't get .NET support in dealing with cert stores. Is that still true?
Thanks.
norm
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I try to send mail to the oher server ,but I cann't send it.Every time when I try, I have this kind of exception: Could not access 'CDO.Message' object.
I am sure that I had installed and runing SMTP service and CDO.
MailMessage mailMessage = null;
MailAttachment mailAttachment = null;
//GetMessageInfo(mailMessage);
mailMessage = new MailMessage();
mailMessage.From = textBoxFrom.Text;
mailMessage.To = textBoxTo.Text;
mailMessage.Subject = textBoxSubject.Text;
mailMessage.Body = textBoxMessage.Text;
//GetMessageAttachment(mailAttachment,mailMessage);
if(textBoxAttachment.Text != "")
{
if(File.Exists(textBoxAttachment.Text))
{
mailAttachment = new MailAttachment(textBoxAttachment.Text, MailEncoding.Base64);
mailMessage.Attachments.Add(mailAttachment);
}
else
{
MessageBox.Show("The file do not exist");
}
}
SmtpMail.SmtpServer.Insert(0,"mail.yahoo.com");
SmtpMail.SmtpServer = "mail.yahoo.com";
mailMessage.BodyFormat = MailFormat.Text;
SmtpMail.Send(mailMessage);
MessageBox.Show("Done");
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There are twp possible reasons:
1. mail.yahoo.com cannot be found
2. mail.yahoo.com does not accept your email. Maybe your not logged in.
Catch the exception and check the inner exceptions, mostly they are more informative.
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I'm trying to write a game in C# to learn the language.
It's a mini clone of civilization III.
The main game window is a map, drawn with tiles (20x20 tiles right now).
To draw the map, I have somewhere a Bitmap that I store as backbuffer, where I draw the tiles themselves. Then to animate the sprites I use this "map bitmap", and draw the sprites above it.
To draw a tile, I have canvas in memory, with all the braw bitmaps (they contains 9x9 tiles), I select the right tile (-> creation of a source rectangle, corresponding to the right tile in the canvas), then I draw it in my Bitmap, after having found the destination rectangle.
So basically it's something like
graphics.Draw(CanvasBitmap, SourceRectangle, DestinationRectangle).
I have some problem with speed : rendering 20x20 tiles (each is 128x64) takes 950 ms. As I need to render it anytime I scroll (because the map is 200x200, but the viewport is only 20x20), it is not acceptable.
Is there a way to speed the process using only GDI+ and C#?
Must I use direct X?
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Try this approach:
Choose the graphics surface of a PictureBox control instead of drawing on a Bitmap object, I mean do your drawing in OnPaint event of PictureBox control(and use e.Graphics). This way you can use benefits of auto scrolling that PictureBox control has. And also speed is more acceptable than when you draw on a Bitmap object.
I hope this helps
Don't forget, that's Persian Gulf not Arabian gulf!
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I can' do this, because I want to precalculate the map backgrounds only when the user wants to scroll. Then moving sprites on the map doesn't need any change in the map itself, so I will use the precalculated bitmap.
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Meisi wrote:
This way you can use benefits of auto scrolling that PictureBox control has. And also speed is more acceptable than when you draw on a Bitmap object.
For a business app maybe.
BitBltFast would actually be the wiseest choice. picture boxes are slow.
I only say this because I'm writing a game in c# right now and have discovered the the GDI+ sucks
I'm not an expert yet, but I play one at work. Yeah and here too.
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something not right here.
- are you drawing all 400 tiles each time?
- are you moving them onscreen in one move or 400 moves?
"When the only tool you have is a hammer, a sore thumb you will have."
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I draw all the 400 tiles each times, because if the user clicks on the globalview "somewhere", I need to redraw all of it.
However, I do it only when the map change (scroll or editor change of terrain), no when things in the layers (a unit animation change).
I move them on screen in one move : I start by drawing them in a bitmap, which is stored, and then in the render function (with a timer), I draw the stored bitmap in the PictureBox.
This last part is fast. I don't understand why drawing the 400 128x64 tiles in the backbuffer is so much longer than drawing the whole image in a 1024x768 PictureBox?
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becuase its 400 times more work....
you need less calls
"When the only tool you have is a hammer, a sore thumb you will have."
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you should cache your whole "world".
i.e. make your buffer as big as the world, and only redraw those in the 400 that have changed.
this way you should only have to do a few redraws..
"When the only tool you have is a hammer, a sore thumb you will have."
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World = 200x200 tiles.
Tile = 128x64 pixels.
As they overlap (isometric view),
let say it's 100x100 tiles.
That's still 81 920 000 pixels... Isn't it to much to store the whole background?
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yes that is pretty big...
maybe you need to reconsider how you draw your world - maybe tiles are not a good idea...
"When the only tool you have is a hammer, a sore thumb you will have."
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Before I did this
graphics.DrawImage(backgroundSprite.Canvas.PictureFile,destinationRectangle,backgroundSprite.SourceRect,GraphicsUnit.Pixel);
and I had in memory one file with 9x9 tiles. I selected the tile from the source rectangle, and copied it in my PictureBox.
Now I have that :
graphics.DrawImage(backgroundCanvasArray[BackgroundCanvas].TilesArray[line,column],offsetX,offsetY);
and I have an array of tile 9x9.
Initialization is a bit longer, as I have to break my 9x9 tiles images into 81 images in an array.
But then, for the rendering I simply draw the tiles directly at the offset, without specifying a source and destination rectangle.
Result : rendering time for a 20x20 tiles world has dropped from 950 ms to 30 ms.
What took time was the resampling of the image to fit the new size, EVEN IF IT WAS THE SAME SIZE.
Now it works well enough
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glad to here you fixed it!
"When the only tool you have is a hammer, a sore thumb you will have."
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Well your first and biggest mistake is not using direct x as a window in your application. GDI sucks for that type of application
Second you need to redraw based on regions.
My advice:
get rid of gdi+ dont even bother with it.
learn direct x and set up the buffered pages
one for the map, cities, and the objects then flip the pages and you ll get plenty of speed
nick
I'm not an expert yet, but I play one at work. Yeah and here too.
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Beware of creating a large bitmap buffer every time you re-paint. Instead, create a new buffer bitmap when the window is resized. (You might already be doing this, but just checking.)
"Blessed are the peacemakers, for they shall be called sons of God." - Jesus
"You must be the change you wish to see in the world." - Mahatma Gandhi
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hi, I want to add grid control in my project as given in MS Project.
1. the problem is i couldn't find how to add no. of blank rows and columns like excel sheet. so, when i open new project it should be appeared blank sheet on the screen.
2.another thing how can i give functionality of tree view on clik on indent and outdent.
3. is there any ocx for network diagram, calendar control and gantt chart??
pls reply me soon.
-bhavin
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if i have a string with multiple lines in it like this:
0 @IQLNP-M7@ INDI
1 NAME Benoni /THOMPSON/
2 GIVN Benoni
2 SURN THOMPSON
1 AFN QLNP-M7
1 SEX M
1 SOUR @S01@
1 BIRT
2 DATE 14 Apr 1782
2 PLAC Alstead, N.h.
1 DEAT
2 DATE 24 Oct 1857
2 PLAC Shalersville, N.h.
1 FAMS @F6073064@
1 FAMC @F6073065@
0 @IQLNP-KV@ INDI
1 NAME Job /THOMPSON/
2 GIVN Job
2 SURN THOMPSON
1 AFN QLNP-KV
1 SEX M
1 SOUR @S01@
1 FAMS @F6073065@
0 @IQLNP-L2@ INDI
1 NAME Lovice /CRANE/
2 GIVN Lovice
2 SURN CRANE
1 AFN QLNP-L2
1 SEX F
1 SOUR @S01@
1 FAMS @F6073065@
...
how would i split it into chunks from the '0' lines to the '0' lines, like this:
**Chunk 1**
0 @IQLNP-M7@ INDI
1 NAME Benoni /THOMPSON/
2 GIVN Benoni
2 SURN THOMPSON
1 AFN QLNP-M7
1 SEX M
1 SOUR @S01@
1 BIRT
2 DATE 14 Apr 1782
2 PLAC Alstead, N.h.
1 DEAT
2 DATE 24 Oct 1857
2 PLAC Shalersville, N.h.
1 FAMS @F6073064@
1 FAMC @F6073065@
**Chunk 2**
0 @IQLNP-KV@ INDI
1 NAME Job /THOMPSON/
2 GIVN Job
2 SURN THOMPSON
1 AFN QLNP-KV
1 SEX M
1 SOUR @S01@
1 FAMS @F6073065@
**Chunk 3**
0 @IQLNP-L2@ INDI
1 NAME Lovice /CRANE/
2 GIVN Lovice
2 SURN CRANE
1 AFN QLNP-L2
1 SEX F
1 SOUR @S01@
1 FAMS @F6073065@
...
etc.
thanks,
Rob
--
There are 10 kinds of people. Those who understand binary and those who don't.
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When reading one line at a time check the value of the first character, if it is '0' you have reached your break point, else append it (a StringBuilder object would work nicely here). There are articles available for reading files in C# if this is what you are asking about. HTH. 
-Nick Parker
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i started out by reading each line one by one with a streamreader but i didn't want to access the file everytime i needed it so i read the whole thing at once and dumped it into a string. now i just need to figure out how to split the string up. i'll look into the stringbuilder class though.
thanks,
Rob
--
There are 10 kinds of people. Those who understand binary and those who don't.
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Search for "\n0 @" in string (or use something faster like StringBuilder). Like this (check syntax, not tested):
string multiple=" ... ";
ArrayList chunks=new ArrayList(1);
while(multiple!="")
{
int p=multiple.IndexOf("\n0 @");
if(p<0)
{
chunks.Add(multiple);
break;
}
chunks.Add(multiple.Substring(0,p));
multiple=multiple.Substring(p+1);
}
Hi,
AW
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could i use the string.split method and use "\n0 @" as the delimeter? btw, what does the @ mean in '\n0 @'?
thanks for the help,
Rob
--
There are 10 kinds of people. Those who understand binary and those who don't.
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1. No. Unfortunately Split method uses chars ... You must use above one character "\n0"
2. All Your "0" groups starts with " @" after "0". It is unnecessary, new line and zero will be enough.
Hi,
AW
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use RegExp
"When the only tool you have is a hammer, a sore thumb you will have."
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