C# Discussion Boards - CodeProject

15-Jul-02 6:04

Hi
Very easy indeed Smile | :)

From the static methods in the File class.

e.g.

File.Move(oldfilename, newfilename);

Moving has exactly the same effect as renaming except that you can rename to any path. But just to rename keep the paths the same. Smile | :)

Now go finish that class! Big Grin | :-D

READ MSDN

static variable

gekoscan14-Jul-02 12:19

gekoscan

14-Jul-02 12:19

In Visual C++ I could declare a static inside a function and no matter how many times this function was called it would only be called once.

ie.

public void foo1()
{
static int iCount = 0;

iCount++;

Console.WriteLine(iCount);
}

public void foo2()
{
while(true)
foo1();
}

This example should just continue to increment a value in the console because the initialization is only done once. How is this done in C#?

Thanks

Re: static variable

Rocky Moore14-Jul-02 13:15

14-Jul-02 13:15

IBF EHT KCAF wrote:
This example should just continue to increment a value in the console because the initialization is only done once. How is this done in C#?

It wouldn't be allowed. Static data would have to live in the class and not the methods. Also, Static anything has to have a full referrence to it. As an example:

class myOwn
{
    static int myStaticStore = 0;

    public int myMember(int StaticStore)
    {
        myOwn.myStaticStore=StaticStore;
        return myOwn.myStaticStore;
    }
}

Rocky Moore

Thanks but no

gekoscan14-Jul-02 13:24

gekoscan

14-Jul-02 13:24

Nope see in C++ this is totally allowed and it makes recurrsion really nice and easy. If I want to write a recursive function I want to be able to have variables inside the method that all the instances of that method can see.

I don't want to have 4 variables declared globally inside a class when only 1 method is using them. I want to declare them static inside a method so only 1 instance exists for all instances of that method.

If this isn't somehow possible in C# then this language has been totally *ucked for recurrsion (GOOD JOB Microsoft). You just took some real horsepower out of your own language.

Re: Thanks but no

Rocky Moore14-Jul-02 13:53

14-Jul-02 13:53

bytewave wrote:
If this isn't somehow possible in C# then this language has been totally *ucked for recurrsion (GOOD JOB Microsoft). You just took some real horsepower out of your own language

It has the same functionality, only the scope of the variable is global to the class rather than per member. You will still only have _one_ varible, for all instances of the class just like in C++. The only time you would have a concern is if you planned to use a static variable of the same name in multiple methods as you could do in C++. Since they are up at the class level they would have to have different names.

Rocky Moore

Re: Thanks but no

Jonathan Tan15-Jul-02 0:05

Jonathan Tan

15-Jul-02 0:05

Well...VB6 also has a "static" modifier that works the same way as C++...i don't know if VB.NET still has it...but it should be quite simple to implement in C# and yet Microsoft doesn't do it...another one is the With block which is in VB but not in C#...how irritating

Re: Thanks but no

Rocky Moore15-Jul-02 10:24

15-Jul-02 10:24

Jonathan Tan wrote:
another one is the With block which is in VB but not in C#...how irritating

I agree with that. Would have been nice. I am just glad they put in "Using" to shorten all those referrence calls!

Rocky Moore

with statement

AndyG16-Jul-02 4:05

AndyG

16-Jul-02 4:05

I don't really care either way, but the with statement is addressed here.

Andy Gaskell, MCSD MCDBA

Data Link Dialog Box???

leppie14-Jul-02 10:13

14-Jul-02 10:13

Hi all,

Does anyone how to bring up the DataLink Properties Dialog for editing a connection string, like under the properties of a OleDbConnection?

Thanx in advance

Smile | :)

READ MSDN

Rocky Moore14-Jul-02 14:01

14-Jul-02 14:01

leppie wrote:
Does anyone how to bring up the DataLink Properties Dialog for editing a connection string, like under the properties of a OleDbConnection?

Not quite sure what you are asking. If you just want to modify the connection in a Wizard form, you can righ click on the connection you used in the Server Explorer and select Modify Connection.

Rocky Moore

Feng Qin14-Jul-02 19:55

Feng Qin

14-Jul-02 19:55

Code:
MSDASC.DataLinks dl = new MSDASC.DataLinks();
dl.PromptNew();

You can find the whole information on msdn : http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnsqlmag2k/html/LinkAPI.asp

In C# project, you should add a com reference named : Microsoft OLE DB Service Component 1.0 Type Library

Good luck! Roll eyes | :rolleyes:

I'm amumu, and you?

leppie14-Jul-02 23:13

14-Jul-02 23:13

Thx

, exactly what I need, but how does one "cast" the returned object to an OleDbConnection? or a ConnectionString?

I presume I will need to implement a UITypeEditor as well as I need to show the property through a property grid.

Smile | :)

READ MSDN

Feng Qin15-Jul-02 16:39

Feng Qin

15-Jul-02 16:39

MSDASC.DataLinks dl = new MSDASC.DataLinks();
ADODB.Connection connection = dl.PromptNew() as ADODB.Connection;

if( null != connection )
MessageBox.Show( connection.ConnectionString );

You should add reference "Microsoft OLE DB Service Component 1.0 Type Library" and the "Microsoft ActiveX Data Objects 2.5 Library" to your project's reference. Roll eyes | :rolleyes:

I'm amumu, and you?

leppie16-Jul-02 0:53

16-Jul-02 0:53

Hi and thx Smile | :)

qf0421 wrote:
MSDASC.DataLinks dl = new MSDASC.DataLinks();
ADODB.Connection connection = dl.PromptNew() as ADODB.Connection;

then as I'm using OleDb:

OldDbConnection conn = new OleDbConnection(connection.ConnectionString); ?

Cant test now but it should work. It just seems a bit over the top for such a "small" thing.

Another question, if you want to run this on another machine, do u need to register both dll's on the other PC or is the Interop.*.dll files ok for that?

Smile | :)

READ MSDN

printing Rich Text Format ???

Feng Qin16-Jul-02 0:59

Feng Qin

16-Jul-02 0:59

I think all dlls you refered are running at local machine, and two support remoting: web service and system.remoting, right? I'm not sure about it. Hmmm | :|

And also you can notice if you add a reference, vs.net will copy the file to your bin directory, does it means dll will be invoked local?

I'm amumu, and you?

One byte at a time

Nnamdi Onyeyiri14-Jul-02 8:13

Nnamdi Onyeyiri

14-Jul-02 8:13

How do i read one byte at a time from a remote file, i.e. a file from the web, then write each byte into a local file?

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

Re: One byte at a time

Nathan Blomquist14-Jul-02 9:54

Nathan Blomquist

14-Jul-02 9:54

public static string RetrievePage(string url)
{
// Creates an HttpWebRequest with the specified URL.
HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url);

// Sends the HttpWebRequest and waits for the response.
HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();

// Gets the stream associated with the response.
Stream receiveStream = myHttpWebResponse.GetResponseStream();
Encoding encode = System.Text.Encoding.GetEncoding("utf-8");

// Pipes the stream to a higher level stream reader with the required encoding format.
StreamReader readStream = new StreamReader( receiveStream, encode );

string retString = readStream.ReadToEnd();

myHttpWebResponse.Close();

return retString;
}

This function takes a URL as a string and the retrieves that URL. It shouldn't be difficult to modify this to make it work with binary (in fact I think it should work with no mods, but I can't be sure...).

Later,
Nathan

---------------------------
Hmmm... what's a signature?

Re: One byte at a time

Nnamdi Onyeyiri15-Jul-02 1:26

Nnamdi Onyeyiri

15-Jul-02 1:26

thanks, but i had already solved this problem.

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

Re: One byte at a time

Anonymous20-Jul-02 23:57

Anonymous

20-Jul-02 23:57

Manners kiddie, manners!
Big Bro is watching you

Patrick Bristow13-Jul-02 6:41

Patrick Bristow

13-Jul-02 6:41

Is there anyone out there who knows how to bring Rich Text to a place other than in the windows controls? I need to be able to print RTF (rich text format) to paper, and I have no earthly idea how. Does anyone have any ideas at all? Thanks in advance

Re: printing Rich Text Format ???

ChrisKo16-Jul-02 10:22

ChrisKo

16-Jul-02 10:22

You can view some sample Printing Documentation here

You can also view some sample code from the SDK that uses a RichTextBox and prints the text from it.

Hope that helps! Smile | :)

--ChrisKo

One for the SharpDevelop gurus out there.

Jon Newman13-Jul-02 6:02

Jon Newman

13-Jul-02 6:02

I am not so fortunate as to have VS.NET yet so I make do with SharpDevelop. However most of you have VS.NET and release your apps as VS.NET projects.
I am trying to get a reference to Shell32 in my SD project. The reference is originally in the FTP client project in the C# section of CP.
The code has this:

private Shell32.Shell m_Shell;

Of course a compile error has appeared saying "What the hell is Shell32?". By examining the XML of the VS.NET project I can see that it references Shell32 as a GUID:

<Reference
    Name = "Shell32"
    Guid = "{50A7E9B0-70EF-11D1-B75A-00A0C90564FE}"
    VersionMajor = "1"
    VersionMinor = "0"
    Lcid = "0"
    WrapperTool = "tlbimp"
/>

How can I import this into SharpDevelop?

The Internet, whats that? Is it a car?

"There's a statistical theory that if you gave millions of monkeys typewriters and set them to work, they'd eventually come up with the complete works of Shakespere. Thanks to the Internet, we know this isn't true."

Help! How do I calculate percentage differences?

AndrewGoodman13-Jul-02 0:56

AndrewGoodman

13-Jul-02 0:56

I need to do a comparison of two dynamic numbers - say 150 and 225. How can I figure out the percentage difference (in this case, 50%) between these two numbers in ASP.Net?

Thanks.

Re: Help! How do I calculate percentage differences?

leppie13-Jul-02 8:05