C# Discussion Boards - CodeProject

Re: Better RichTextBox (or custom textbox)

Pete Bassett3-Nov-02 8:47

3-Nov-02 8:47

Bog wrote:
were you able to do it while the user is typing

Yup. Just disable drawing to the window so none of the results of your selection code is drawn while you're doing it. Then store the actual selection (which will probably just be the current caret location) then run your highlightiong code, changing the selection etc etc etc. Then resore the selection/caret etc and Re-enable drawing to the rich text window.

I handled a couple of cases

1) if the user is just typeing, only highlight the current line. This makes the hightlighting quick.

2) When the RTB gets pasted to, highlight the newly added parts or the whole document.

Have a look at the C++ examples to get a better idea of the process. Failing that, just have a go at it and see how it works.

Pete

Insert Sig. Here!

Re: Better RichTextBox (or custom textbox)

Philip Fitzsimons1-Nov-02 7:54

Philip Fitzsimons

1-Nov-02 7:54

i wonder if its based on the real richtextbox - if it is you could just send it the messages to enable/disable the other features...

"When the only tool you have is a hammer, a sore thumb you will have."

Re: Better RichTextBox (or custom textbox)

Stephane Rodriguez.1-Nov-02 8:07

Stephane Rodriguez.

1-Nov-02 8:07

The RichTextBox class constructor is not marked internal, so you can derive it.

I would suggest you download a free tool like Anakrino[^] to decompile the IL code to C#, as a help to override the methods.

How low can you go ?
(MS rant)

Password in a Propertygrid

Andy Hampshire1-Nov-02 5:00

Andy Hampshire

1-Nov-02 5:00

Hi All,

Probably a stupid qustion Wink | ;)

but...

I've got an object that I'm displaying to the end user via a PropertyGrid control. One of the properties is a Password. I'd like to display this item as "*****" rather than visible text.

Is there anyway of doing this ?

Cheers .. Andy

Re: Password in a Propertygrid

Stephane Rodriguez.1-Nov-02 8:12

Stephane Rodriguez.

1-Nov-02 8:12

You have to write a custom UI type editor[^]. (there is a sample).

How low can you go ?
(MS rant)

Re: Password in a Propertygrid

Andy Hampshire1-Nov-02 8:23

Andy Hampshire

1-Nov-02 8:23

Thanks for the info ... but the link doesn't work for me...

Re: Password in a Propertygrid - HELP !!

Andy Hampshire1-Nov-02 15:22

Andy Hampshire

1-Nov-02 15:22

Well i've managed to find the info and i've tried it out.

The examples i can find give me the ability to render a UI component as a drop down or modal control. I've played with this and have been able to get a TextBox with a password mask just fine.

BUT ... the data in the PropertyGrid is still clear text ! Which is not what i want... this is the text that must be hidden.

Ideas anyone ?

Re: Password in a Propertygrid - HELP !!

leppie1-Nov-02 22:16

leppie

1-Nov-02 22:16

I think you need a type convertor , not a UItype editor. Also the password have to be a class of its own (perhaps, maybe not) and not just a string.

Hope this helps Smile | :)

"There are no stupid question's, just stupid people."

Re: Password in a Propertygrid - HELP !!

Feng Qin3-Nov-02 22:24

Feng Qin

3-Nov-02 22:24

Well, in the normal way, the property can be edited in a textbox, right?
So, we can change its default UITypeEditor to a TextBox which PasswordChar is * or any char you like, by setting some attributes like EditorAttribute on the property you have.
Hope helps to you. Cool | :cool:

I'm amumu, and you?

Not able to fetch first row of excel......

Saroj1-Nov-02 0:33

Saroj

1-Nov-02 0:33

Hello Everybody,

I am trying to import data from Excel sheets through my application.But its not reding the first row of Excel sheet.

Somebody suggested me to set "HDR=No" property in my connection string.
So now my connection string looks as follows,

string strConn;
strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" +
"Data Source="+fullPath+";" +
"Extended Properties=Excel 8.0;HDR=No;";

but its giving me following exception

"System.Data.OleDb.OleDbException : Could not find
installable ISAM
at System.Data.OleDb.OleDbConnection.ProcessResults(Int32
hr)
at System.Data.OleDb.OleDbConnection.InitializeProvider()
at System.Data.OleDb.OleDbConnection.Open()
........"

To overcome this error i tried doing following things

I went to
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Jet\4.0\Engines\Excel

location in my windows registery and found following things,

Name Type Data

win32 REG_SZ c:\WINDOWS\System32\msexcl40.dll

then I checked if this "msexcl40.dll" really exist at the path c:\WINDOWS\System32
and it was present there.

Then i uninstalled office2000 from my machine and installed OfficeXP.
Still i am getting the same exception.

Can anybody help me in finding out where i am going wrong or what could be the problem?

Thanks in advance,

Regards,
Saroj

Saroj

Re: Not able to fetch first row of excel......

Stephane Rodriguez.1-Nov-02 2:59

Stephane Rodriguez.

1-Nov-02 2:59

There can be many reasons. Reinstalling Office may not be enough, especially when you know that what you are actually using here is the MDAC run-time which is separately available.

I would suggest to install MDAC 2.7[^]

Other than that, msexcl40.dll has two MDAC child dll dependencies : msjet40.dll, mswstr10.dll

How low can you go ?
(MS rant)

about visual soucesafe6.0c

Anonymous31-Oct-02 22:18

Anonymous

31-Oct-02 22:18

Where can i download the visual soucesafe 6.0c?Thanks. Hmmm | :|

Re: about visual soucesafe6.0c

TigerNinja_1-Nov-02 12:33

TigerNinja_

1-Nov-02 12:33

i think it only comes with Visual Studio.NET Enterprise Edition, it is the piece that does all the integration work between VS.NET and the VSS database

Soliant | email

"The 'B' in Visual Basic means Beginner" - R. Bischoff

downcasting Object types

Bilal31-Oct-02 21:33

Bilal

31-Oct-02 21:33

Someone please tell me if this is supposed to work:
(because it compiles and all I'm getting is a runtime invalid cast exception)

Object obj = someAssembly.CreateInstance("MyClass");
MyAbstractClass x = (MyAbstractClass) obj; //downcasting allowed??
x.doCoolStuff(); //exploit polymorphism

More importantly, I don't want to use Invoke() calls. Isn't there a cleaner work-around?

Bilal

Re: downcasting Object types

SimonS31-Oct-02 22:14

SimonS

31-Oct-02 22:14

What's the definition of MyClass and MyAbstractClass?

Also, have you tried this without using CreateInstance to see if that works?

Cheers,
Simon

"VB.NET ... the STD of choice", Me, interal company memo

Re: downcasting Object types

Bilal31-Oct-02 22:19

Bilal

31-Oct-02 22:19

MyClass is derived from MyAbstractClass (sorry, should have mentioned that) and implements parent's abstract functions.

What alternatives are there for creating objects at runtime from definitions available only in other .NET DLLs or EXEs?
I'm just a .NET newbie Blush | :O

Bilal

Re: downcasting Object types

Eric Gunnerson (msft)1-Nov-02 13:01

Eric Gunnerson (msft)

1-Nov-02 13:01

You might want to look at the Activator class.

Note that if you want to cast to an abstract class you own, the class will have to refer to the same abstract class (ie same assembly and same version)

Re: downcasting Object types

John Fisher1-Nov-02 13:40

John Fisher

1-Nov-02 13:40

As Eric allueded to, you've got to watch out when using objects from other assemblies. Unless you're using an interface or class type shared from the same .dll, you'll run into problems. In other words, the assembly creating the object and the assembly trying to downcast the object must both reference a separate assembly that describes the interface or class to which you are downcasting. (Does that make sense?) Big Grin | :-D

John

Re: downcasting Object types

Bilal1-Nov-02 16:17

Bilal

1-Nov-02 16:17

It does and you two clinched it. Thanx guys!

Bilal

Re: downcasting Object types

Paul Riley1-Nov-02 1:23

Paul Riley

1-Nov-02 1:23

Can't imagine why this wouldn't work. Try this:

MyAbstractClass x = obj as MyAbstractClass;

as is a lot more flexible than direct casting and if it can't cast then rather than throwing an exception it will set x to null, giving you some room to debug.

Paul
I think there're pieces of me you've never seen - Tori Amos, Tear in Your Hand

Re: downcasting Object types

Feng Qin3-Nov-02 22:33

Feng Qin

3-Nov-02 22:33

The following is more safer:

Object obj = someAssembly.CreateInstance("MyClass");<br />
if( obj is MyAbstractClass )<br />
{<br />
  MyAbstractClass x = (MyAbstractClass) obj; //downcasting allowed??<br />
  x.doCoolStuff(); //exploit polymorphism<br />
}

and the precondition is you have added reference library, which has a definition of MyAbstractClass. Cool | :cool:

I'm amumu, and you?

MD5withRSA signature verification

bluestn31-Oct-02 16:39

bluestn

31-Oct-02 16:39

I'm doing the MD5withRSA signature verification with C#.net.

Pls kindly tell me How can I have this job done?

I tested the following code, but can not work.
Thanks in advance.

FileStream fs = File.OpenRead(@"c:\pk"); //pk is the public key file.

RSAParameters RSAKeyInfo = new RSAParameters();
RSAKeyInfo.Exponent = new Byte[3]{1,0,1};

RSAKeyInfo.Modulus = new byte[fs.Length-5];
fs.Seek(5, System.IO.SeekOrigin.Begin);
fs.Read(RSAKeyInfo.Modulus, 0, (int)(fs.Length-5));

fs.Close();

RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
RSA.ImportParameters(RSAKeyInfo);
RSAPKCS1SignatureDeformatter RSADeformatter = new RSAPKCS1SignatureDeformatter(RSA);
If RSA.VerifyData(bData, "MD5", bSig)
{
Console.WriteLine("Verification Ok!");
}
else
{
Console.WriteLine("Verification Failed!");
}

CryptoAPI - Cryptography - Com

delcorral31-Oct-02 13:33

delcorral

31-Oct-02 13:33

I have to make a CryptoCom, who:
* Use CAPICOM (Microsoft product)
* Crypting Algorithm: Tryple DES (3DES)
* NOT SINGNED TIME.
* Language: VB ó C#

How can I do???

Ps: The last one option is only a setting, but I don't know set this in my CryptoCOM.
Language: VB ó C#

Re: CryptoAPI - Cryptography - Com

ian mariano1-Nov-02 8:32

ian mariano

1-Nov-02 8:32

Read up on the System.Security.Cryptography Namespace[^] in MSDN.

Check out these Articles on CodeProject:

"The greatest danger to humanity is humanity without an open mind."
- Ian Mariano

http://www.ian-space.com/

Delete/Copy files from another machine!

KoRn31-Oct-02 10:41

KoRn

31-Oct-02 10:41

Hi I have written an windows app with C# witch is supposed to syncronize 2 folders e.g

FROM: C:\Project\Project
TO: \\server\d$\my.project.com

I have made the entire source witch delete files/folders on TO and copy/create files if they don't exists.

My problem is when it tries to copy/delete files, I get permissions denied, I am running the program when I am logged in as administrator and I have administrations access on target machines.

I can open explorer and edit/delete the files witch it complains about.

What can I do to allow my app to copy/overwrite/delete files on the TO machine ?

Somehow as far as I can see, I can overwrite *.dll and *.pdb, but not *.aspx and *.cs

I have tried almost everything:

System.Security.Permissions.FileIOPermission

int token1;

WindowsIdentity mWI1 = WindowsIdentity.GetCurrent();
token1 = mWI1.Token.ToInt32();
IntPtr token2 = new IntPtr(token1);
ImpersonateLoggedOnUser(token2);

And many more, can it maybe be because the IIS is blocking those aspx files, in that case what can I do to overrule?

Because I have one similiar program with the name "InSync" with does overwrite the files when I run it with.

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