Re: Asymetric Cryptography Problem - C# Discussion Boards

Place form 10px from right side of screen.

jafingi5-Aug-07 7:46

5-Aug-07 7:46

Hi, I want to place my windows form 10 pixels from the right side of my user's screen.

But they have different screen resolutions, so i cant place it with a value in pixels.

So do anyone know how to do it?

I'm using this code on my form-load, to place the window:

<br />
this.Height = 175;<br />
this.Location = new Point(0, Screen.PrimaryScreen.WorkingArea.Height - this.Height);<br />

Thanks,
Elias Sorensen

Re: Place form 10px from right side of screen.

Hessam Jalali5-Aug-07 8:58

Hessam Jalali

5-Aug-07 8:58

<br />
int distanceFromRight=10;<br />
int distanceFromBottom=10;<br />
<br />
int screenWidth=Screen.PrimaryScreen.WorkingArea.Width;<br />
int screenHeight = Screen.PrimaryScreen.WorkingArea.Height;<br />
<br />
this.Left = screenWidth - this.Width - distanceFromRight;<br />
this.Top=screenHeight-this.Height-distanceFromBottom;<br />
<br />

or you can use

<br />
<br />
int x = screenWidth - this.Width - distanceFromRight;<br />
int y= screenHeight-this.Height-distanceFromBottom;<br />
<br />
this.SetBounds(x,y,this.Width,this.Height);<br />
<br />

Re: Place form 10px from right side of screen.

Luc Pattyn5-Aug-07 8:59

Luc Pattyn

5-Aug-07 8:59

Hi,

your code is placing the window at the bottom end of the screen, but flush left
since you specified zero for X.

you could replace that zero by an expression that is basically the same as you did
for Y, substituting widths for heights of course.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

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Re: Place form 10px from right side of screen.

jafingi5-Aug-07 9:38

jafingi

5-Aug-07 9:38

Thanks to all. It works perfect now Smile | :)

Asymetric Cryptography Problem

unforgiven_wild_rose5-Aug-07 5:11

unforgiven_wild_rose

5-Aug-07 5:11

Hi Everyone

i've a problem using System.Security.Cryptography.RSACryptoServiceProvider class
when i work with this we must pass the RSA Crytographic parameteres to an object of the RSAParameters class
but they are in the form of Modulus, P, Q, Exponent & ...
we fill the RSAParameteres with these and pass it to the RSACryptoServiceProvider

but i have Public key and Private key from a certificate file, and i haven't Modulus, P, Q, Exponent & ...
i want to know how can i encrypt and decrypt string directly with Public & Private key not with Modulus, P, Q, Exponent & ...

thanx all.

Re: Asymetric Cryptography Problem

Hessam Jalali5-Aug-07 6:27

Hessam Jalali

5-Aug-07 6:27

Asymmetric keys can be created using ToXmlString() method
and can be retrieved using FromXmlString method

it can be done like this:

<br />
AsymmetricAlgorithm asym=AsymmetricAlgorithm.Create();<br />
string myCode=asym.ToXmlString(true);//if true contains private params<br />
<br />
RSACryptoServiceProvider rsa=new RSACryptoServiceProvider();<br />
rsa.FromXmlSring(myCode);<br />
<br />
//you can use it now<br />
<br />

and if you want the parameters you can use ExportParameters
and of course for converting it to xmlKey you can use ToXmlString again.

if you want get only the key (modulus) part before it you can create the complete key using a little xml operations or filling RSAParameters and importing it using ImportParameters method.

hope the post would be useful
good luck

Re: Asymetric Cryptography Problem

unforgiven_wild_rose5-Aug-07 20:50

unforgiven_wild_rose

5-Aug-07 20:50

So, what you said is completely true in the way of using generated randomly parameters, but id don't want to use them, I have Public Key & Private Key only, and I want to create parameters from them (and not randomly) and then using the parameters to encrypt and decrypt

Nagan ina bisavadan Wink | ;-)

Re: Asymetric Cryptography Problem

Hessam Jalali6-Aug-07 1:02

Hessam Jalali

6-Aug-07 1:02

if you mean your key pairs is in the certificate or key file like snk maybe these articles can help!

http://www.codeproject.com/dotnet/PerKeyGen.asp?df=100&forumid=42769&exp=0&select=895108

http://www.topxml.com/rbnews/-NET-XML-System-XML/re-2963_Get-RSA-Public-key-from-Assembly-or-SNK-File.aspx

As you know modulus and exponent members are public key parts and others are for private key and if you have a custom certificate file you can retrieve it base on it's structure.

Best Regards Smile | :)

Re: Asymetric Cryptography Problem

unforgiven_wild_rose6-Aug-07 23:52

unforgiven_wild_rose

6-Aug-07 23:52

Thank you so much, i use them and give you my resault

Hessam jan vaghean mamnunam

ComboBox In DataGridView

Thaer Hamael5-Aug-07 4:21

Thaer Hamael

5-Aug-07 4:21

Hi All
I wount set the type of column in DataGridView to combobox how i can do that
and wount to set the DataSourc to Specifyic Table How i can do that
thanks for any body help me

Thaer

Try to use C# code in C++ code as com instance ...

Yanshof5-Aug-07 1:56

Yanshof

5-Aug-07 1:56

I use the RegAsm.exe to registration the C# Dll but when i try to do CoCreateInstance i don't know where to find the IID of the C# DLL.

Someone can help me please ?

Thanks.

Reading file as binary. Success. But......

Life as a Coder5-Aug-07 1:12

Life as a Coder

5-Aug-07 1:12

Thanks for the answear before. I manage to cr8 app to open file as binary, and success.
but..... sometimes it can't read the whole content

This is my code :

<my code><br />
public byte[] readBin(string FILE_NAME)<br />
        {<br />
            // Create the reader for data.<br />
            FileStream fs = new FileStream(FILE_NAME, FileMode.Open, FileAccess.Read);<br />
            BinaryReader r = new BinaryReader(fs);<br />
            // Read data from Test.data.<br />
            int FILE_LENGTH = (int)fs.Length;<br />
            int i = 0;<br />
            byte[] output = new byte[FILE_LENGTH];<br />
            sbyte read;<br />
            try<br />
            {<br />
                while (r.PeekChar() != -1)<br />
                {<br />
                    read = r.ReadSByte();<br />
                    output[i++] = (byte)read;<br />
                }<br />
            }<br />
            catch (Exception ex)<br />
            {<br />
                MessageBox.Show(ex.ToString());<br />
            }<br />
<br />
            r.Close();<br />
            fs.Close();<br />
            return (output);<br />
        }<br />
</end of code>

It really can read few file perfectly include the file that can't be opened correctly before. but sometimes it still miss a part of file. eg:
a file contain binary like this (opened by UltraEdit32)

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F<br />
10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F<br />
20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F<br />
30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F<br />
40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F<br />
50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F<br />
60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F<br />
70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F<br />
80 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F<br />
90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F<br />
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF<br />
B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF<br />
C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF<br />
D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF<br />
E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF<br />
F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF

My code only manage to read

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F<br />
10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F<br />
20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F<br />
30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F<br />
40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F<br />
50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F<br />
60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F<br />
70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F

And sometimes it throw an exception like this when open some file.

<small>System.ArgumentException: The output char buffer is too small to contain the decoded characters, encoding 'Unicode (UTF-8)' fallback 'System.Text.DecoderReplacementFallback'.<br />
Parameter name: chars<br />
   at System.Text.Encoding.ThrowCharsOverflow()<br />
   at System.Text.Encoding.ThrowCharsOverflow(DecoderNLS decoder, Boolean nothingDecoded)<br />
   at System.Text.UTF8Encoding.GetChars(Byte* bytes, Int32 byteCount, Char* chars, Int32 charCount, DecoderNLS baseDecoder)<br />
   at System.Text.DecoderNLS.GetChars(Byte* bytes, Int32 byteCount, Char* chars, Int32 charCount, Boolean flush)<br />
   at System.Text.DecoderNLS.GetChars(Byte[] bytes, Int32 byteIndex, Int32 byteCount, Char[] chars, Int32 charIndex, Boolean flush)<br />
   at System.Text.DecoderNLS.GetChars(Byte[] bytes, Int32 byteIndex, Int32 byteCount, Char[] chars, Int32 charIndex)<br />
   at System.IO.BinaryReader.InternalReadOneChar()<br />
   at System.IO.BinaryReader.Read()<br />
   at System.IO.BinaryReader.PeekChar()<br />
   at ASCII_test.fileHandle.readBin(String FILE_NAME) in D:\Core Document\Programming\Microsoft Visual Studio 2005\ASCII test\ASCII test\fileHandle.cs:line 43</small><br />

Please someone help me. Smile | :)

Thanks before.

Training makes perfect....

Re: Reading file as binary. Success. But......

Colin Angus Mackay5-Aug-07 1:27

Colin Angus Mackay

5-Aug-07 1:27

What are you using sbyte (signed byte) for? Keep it consistent and use byte all the way through.

Why don't you use ReadBytes[^] instead of peeking at the next item and then deciding whether to proceed or not.

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Re: Reading file as binary. Success. But......

Life as a Coder5-Aug-07 1:35

Life as a Coder

5-Aug-07 1:35

oh yeah. about the sbyte, i forgot to change it back to byte. I use byte before. but I'm get frustated and try many things include change byte to sbyte. Smile | :)

Thank you very much. It really make my app run perfectly as i want.

Training makes perfect....

Re: Reading file as binary. Success. But......

Luc Pattyn5-Aug-07 1:56

Luc Pattyn

5-Aug-07 1:56

Hi,

some more remarks:

1.
it is not common practice to use uppercase for variables (FILE_LENGTH)
and the underscore does not really belong there either; you have a
background in C/C++ I trust, C# coders don't do these things...

2.
there is no need for PeekChar and the End-Of-File test, since you already
know the file length

3.
there is no need for a loop; if you want to hold all the bytes in an array,
just call BinaryReader.ReadBytes(length)

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

how to detetmine that sql was installed on computer or not ?

hdv2125-Aug-07 1:05

hdv212

5-Aug-07 1:05

hi i want to create list of instance(s) of sql server that was installed on computer, how to do ?
thanks

Re: how to detetmine that sql was installed on computer or not ?

Developer6115-Aug-07 1:14

Developer611

5-Aug-07 1:14

Hi there .

A simple way to do this , just send and open empty connection in try catch block
Your connection string can looks like this following code :

<br />
private Boolean TestConnectionString()<br />
{<br />
string sqlServerDefaultConnectionString = "Data Source = (local) ; initial catalog = Master ; Integrated Security = true; ";<br />
<br />
SqlConnection sqlConnection = new SqlConnection();<br />
sqlConnection.ConnectionString = sqlServerDefaultConnectionString ;<br />
try<br />
{<br />
sqlConnection.Open();<br />
return true;<br />
}<br />
catch { /*CCommon.WriteToErrorFile(err.ToString());*/ return false; }<br />
finally <br />
{ <br />
if (!(sqlConnection == null)) <br />
{ sqlConnection.Close(); <br />
sqlConnection.Dispose();<br />
} <br />
}<br />
}<br />
<br />

DMASTER

Re: how to detetmine that sql was installed on computer or not ?

Colin Angus Mackay5-Aug-07 1:24

Colin Angus Mackay

5-Aug-07 1:24

That won't always work. What if there are no default instances of SQL Server installed. e.g. SQL Server 2005 Express Edition instals as an instance called SQLEXPRESS.

Re: how to detetmine that sql was installed on computer or not ?

Colin Angus Mackay5-Aug-07 1:33

Colin Angus Mackay

5-Aug-07 1:33

hdv212 wrote:
i want to create list of instance(s) of sql server that was installed on computer, how to do ?

This sample[^] may give you the hints that you need to get you on the right tracks.

Re: how to detetmine that sql was installed on computer or not ?

Paul Conrad5-Aug-07 5:06

Paul Conrad

5-Aug-07 5:06

There is an article around here that shows how to get all the SQL Server instances on the visible network. Do a search in the C# database articles and you should be able to find it, since it is an app written in C#.

"The early bird may get the worm, but the second mouse gets the cheese" - anonymous, found in Uncle John's Bathroom Reader

Crystal Report working with generic collections

Developer6114-Aug-07 22:44

Developer611

4-Aug-07 22:44

Is it possible to work with generic collections in crystal report?

I defined a generic list like this:

List<Employee> employeeList = new List<Employee>();

And now I want to bind this collection with crystal report and I don't know how crystal report can work with this collection fields in my employee class .

If anybody know please explain in some example .

Thank you very much .

DMASTER

what is exe of search option in win xp

San@Coding4-Aug-07 22:11

San@Coding

4-Aug-07 22:11

hi i just wana know the exe of search option present in start menu of windows XP

Re: what is exe of search option in win xp

Luc Pattyn4-Aug-07 23:56

Luc Pattyn

4-Aug-07 23:56

Hi,

the search facility in Windows Explorer does not have its own EXE; when you
start a search no new process gets launched. You can verify this with some
system observation tool such as TaskInfo. Hence the search code is part of
what is always loaded, probably explorer.exe itself.

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

draw a box on screen

hamid_m4-Aug-07 21:50

hamid_m

4-Aug-07 21:50

Draw a fill box on screen. how can i get graphic object of screen or draw a box on screen?
thank you

Re: draw a box on screen

ArunkumarSundaravelu6-Aug-07 5:22

ArunkumarSundaravelu

6-Aug-07 5:22

Hi
You may use System.Drawing.Graphics and it have Drawline,DrawRectanle ...

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