C# Discussion Boards - CodeProject

Re: Convert Object To Byte Array

Nick Parker5-Sep-02 8:54

Nick Parker

5-Sep-02 8:54

Sounds good, I'll give it a go. Smile | :)

Thanks

Nick Parker

Re: Convert Object To Byte Array

Nnamdi Onyeyiri5-Sep-02 9:29

Nnamdi Onyeyiri

5-Sep-02 9:29

did it work?

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

Re: Convert Object To Byte Array

Nick Parker5-Sep-02 9:29

Nick Parker

5-Sep-02 9:29

Not sure, I will go check, I was help someone else here at work with it. I'll go check?

Nick Parker

Re: Convert Object To Byte Array

Nick Parker5-Sep-02 10:07

Nick Parker

5-Sep-02 10:07

Actually he did something different, the MemoryStream didn't error out, however it didn't return anything. He has it working now though, Thanks.

Nick Parker

Regex replacement-Fixed

Zombies with Coffee, LLC5-Sep-02 6:32

Zombies with Coffee, LLC

5-Sep-02 6:32

I was wanting to replace my 'first' name with an edit that the user has performed. I am breaking up the information well, thanks to Eric Gunnerson's marvelous little regex program.

Regex regName = new Regex( @"?< Last >[^,]+)*(,)*( )*(?< First >\S+)*( )*(?< Middle >.+)$" );
String strFirst = "Jane";
String strCurrent = "Doe, John William";

Match pMatch = regName.Match( strCurrent );

if( pMatch.Success )
{
   Group pGroup = pMatch.Groups[ " First " ];

   if( pGroup.Index > 0 )
      strReplace  = strText.Substring( 0, pGroup.Index );

   strReplace += strFirst;

   if( pGroup.Index + pGroup.Length < strText.Length )
      strReplace += strText.Substring( pGroup.Index + pGroup.Length );
}

Convert Byte Array To String

Nick Parker5-Sep-02 5:47

Nick Parker

5-Sep-02 5:47

The ToString(); method isn't doing it, is there another way?

Nick Parker

Re: Convert Byte Array To String

Nnamdi Onyeyiri5-Sep-02 5:49

Nnamdi Onyeyiri

5-Sep-02 5:49

string str = String.Empty;
foreach(byte b in array)
   str += ((char)b).ToString();

that should work.

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

Re: Convert Byte Array To String

Paul Ingles5-Sep-02 6:02

Paul Ingles

5-Sep-02 6:02

I believe you can also use BitConverter.ToString(), I don't have the documentation to hand, but I'm pretty sure thats it. The only parameter to ToString is the array AFAIK.

--
Paul
"I need the secure packaging of Jockeys. My boys need a house!"
- Kramer, in "The Chinese Woman" episode of Seinfeld

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Re: Convert Byte Array To String

jparsons5-Sep-02 12:22

jparsons

5-Sep-02 12:22

I believe this will work.

String data = System.Text.Encoding.ASCII.GetString(my_byte_array)

Jared
jparsons@jparsons.org
www.prism.gatech.edu/~gte477n

Callbacks

Nnamdi Onyeyiri5-Sep-02 3:55

Nnamdi Onyeyiri

5-Sep-02 3:55

Im importing a method from Gdi32.dll that uses callbacks. I defined my callback like this.

[DllImport("SomeLib.dll")]<br />
static extern SomeFunc(MyCallback callback);<br />
<br />
delegate int MyCallback(int bla, string foo);<br />
<br />
private int DoSomthing(int bla, string foo)<br />
{<br />
   ...<br />
}<br />
<br />
...<br />
SomeFunc(new MyCallback(DoSomething));<br />
...

yet the DoSomthing method is never called Frown | :(

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

Re: Callbacks

Stephane Rodriguez.5-Sep-02 4:16

Stephane Rodriguez.

5-Sep-02 4:16

I guess the signatures are wrong, produce an exception in CLR, but are trapped in /dev/null so you don't see a sh*t.

In other words, your SomeFunc doesn't even have a return value. Was the code snippet a real code ?

This should be :

[DllImport("SomeLib.dll"), CharSet=CharSet.Auto)]
public static extern <something> SomeFunc(MyCallback callback);


public delegate int MyCallback(int bla, string foo);

And I swallow a small raisin.

Re: Callbacks

Nnamdi Onyeyiri5-Sep-02 4:24

Nnamdi Onyeyiri

5-Sep-02 4:24

no it wasnt real code, i am tryin to use the EnumFontFamiliesEx function.

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

Re: Callbacks

Stephane Rodriguez.5-Sep-02 4:47

Stephane Rodriguez.

5-Sep-02 4:47

From what I see in EnumFontFamiliesEx, you've got to marshall structures as well, thus redefine using C# all that NEWTEXTMETRIC and stuff. leppie has posted a lot about marshalling structures in this forum. Cool | :cool:

And I swallow a small raisin.

Re: Callbacks

Nnamdi Onyeyiri5-Sep-02 5:48

Nnamdi Onyeyiri

5-Sep-02 5:48

i dont need any of the text metric stuff, so ive just swapped that for object. ill have a look at what i may need to do with marshalling. but i have remade the LOGFONT and ENUMLOGFONT structures.

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

Re: Callbacks

James T. Johnson5-Sep-02 11:33

James T. Johnson

5-Sep-02 11:33

you need to keep a reference to the delegate live while the Enum is in progress.

MyCallback foo = new MyCallback(DoSomething);<br />
<br />
SomeFunc(foo);<br />
<br />
foo = null

Otherwise the delegate becomes eligable for collection immediately (as it is passed into unmanaged code) and that could be what you are seeing.

James
"And we are all men; apart from the females." - Colin Davies

Re: Callbacks

leppie6-Sep-02 1:16

leppie

6-Sep-02 1:16

James T. Johnson wrote:
Otherwise the delegate becomes eligable for collection immediately (as it is passed into unmanaged code) and that could be what you are seeing.

Does the delegate NOT get collected if it is passed into managed code?

I thought I saw something about HandleRef, but I'm not sure if it applicable in this case.

MYrc : A .NET IRC client with C# Plugin Capabilities. See
http://sourceforge.net/projects/myrc for more info. Big Grin | :-D

aligning hexadecimal output

Rüpel5-Sep-02 3:06

Rüpel

5-Sep-02 3:06

how can i tell C# to fill remaining space with '0'?

when writing:

string.Format("0x{0,4:X}",256);

i get

0x 100

but i want

0x0100

the msdn-documentaition just says "...is padded with spaces" - no word on changing the fill-character. is this possible at all?

Confused | :confused:

:wq

Re: aligning hexadecimal output

leppie5-Sep-02 3:18

leppie

5-Sep-02 3:18

String.PadLeft Method

Right-aligns the characters in this instance, padding on the left with a specified Unicode character for a specified total length.

public string PadLeft(int, char);

Smile | :)

MYrc : A .NET IRC client with C# Plugin Capabilities. See
http://sourceforge.net/projects/myrc for more info. Big Grin | :-D

Re: aligning hexadecimal output

Rüpel5-Sep-02 3:26

Rüpel

5-Sep-02 3:26

ah. not the way i thought, but an option. Wink | ;)

thx

:wq

Re: aligning hexadecimal output

Rüpel5-Sep-02 3:25

Rüpel

5-Sep-02 3:25

current workaround (input is a Int16, so 4 chars are always enough)

Int16 id = // set somewhere before
string.Format("0x{0}{1}{2}{3:X}",(id<4096)?"0":"",(id<256)?"0":"",(id<16)?"0":"",id);

but thats kind of Dead | X|

:wq

Re: aligning hexadecimal output

Stephane Rodriguez.5-Sep-02 7:04

Stephane Rodriguez.

5-Sep-02 7:04

int f = 256;
string s = f.ToString("0000");

And I swallow a small raisin.

Application.Exit isn't working

jparsons5-Sep-02 3:04

jparsons

5-Sep-02 3:04

I have a form with a menubar and a tab control. Each tab has a set of buttons which inlcude Close and Detach. Once I hit either of these buttons, the code works as expected. However after that my application refuses to exit.

The button I've played with the most, Close, has relatively simple code. It iterates through the COntrols on th emain form, finds the tab page it's looking for and then removes it.

I've traced my code and I know that Application.Exit() is being called but it's not forcing Application.Run to return. What could be going wrong?

Jared
jparsons@jparsons.org
www.prism.gatech.edu/~gte477n

Re: Application.Exit isn't working

Russell Morris5-Sep-02 9:46

Russell Morris

5-Sep-02 9:46

There is a bug in the WinForms code that causes forms to refuse to close if their ActiveControl (ie the control that has focus) is removed. I would expect that this is what you are experiencing.

There are a number of workarounds available on the web and newsgroups (time for google[^]!). The easiest I've found is to manually shift focus to an off-screen, permanent control before you remove the other control.

--
Russell Morris

"Have you gone mad Frink? Put down that science pole!"

Re: Application.Exit isn't working

jparsons5-Sep-02 12:17

jparsons

5-Sep-02 12:17

Ouch. Well the control that I am removing is just a tab page in the tab control. I'll just switch focus to another tab page and then remove the one I want.

Sh*tty bug. Hope they will fix it soon.

Jared
jparsons@jparsons.org
www.prism.gatech.edu/~gte477n

VC 6 code won't compile in .Net

Ryan Cromwell5-Sep-02 2:56

Ryan Cromwell

5-Sep-02 2:56

I have an Explorer extension that implements the IContextMenu interface. It all compiles fine in vc6 but if I open and hence convert it in vc7 (.net) it tells me that interface hasn't been defined. In my class file I can right click on the word IContextMenu and go to definition and life is good. all win32 defines are correct. Would there be a problem with the SDK if it was installed before .Net. Maybe I'll check the SDK update...

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