C# Discussion Boards - CodeProject

5-Sep-02 7:12

Does anyone have any ideas how to do this?

Nick Parker

Nnamdi Onyeyiri5-Sep-02 8:11

5-Sep-02 8:11

cant you cast it? if not, the only other solution i can think of is to write the object to a MemoryStream then read it back out, but there must be a better way. Smile | :)

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

Nick Parker5-Sep-02 8:33

5-Sep-02 8:33

I get an error when I try to do something like:

byte[] myByte;
myByte = (byte[])e.PostData;

Am I doing this wrong?

Nick Parker

Nnamdi Onyeyiri5-Sep-02 8:43

5-Sep-02 8:43

your have casted correctly. the only other thing i can think of is to use the MemoryStream class.

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

Nick Parker5-Sep-02 8:44

5-Sep-02 8:44

Could you show an example, or do you know of a link to one?

Nick Parker

Nnamdi Onyeyiri5-Sep-02 8:50

5-Sep-02 8:50

thats some speedy gonzales response you got there. Smile | :)

using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
...

Stream s = new MemoryStream();
BinaryFormatter bf = new BinaryFormatter();
bf.Serialize(s, myObject);
byte[] myBytes = new byte[s.Length];
s.Read(myBytes, 0, s.Length);
s.Close();

that should do it, [i think, i hope] Smile | :)

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

Nick Parker5-Sep-02 8:54

5-Sep-02 8:54

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

Thanks

Nick Parker

Nnamdi Onyeyiri5-Sep-02 9:29

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."

Nick Parker5-Sep-02 9:29

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

Nick Parker5-Sep-02 10:07

Convert Byte Array To String

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 );
}

Nick Parker5-Sep-02 5:47

Re: Convert Byte Array To String

5-Sep-02 5:47

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

Nick Parker

Nnamdi Onyeyiri5-Sep-02 5:49

Re: Convert Byte Array To String

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."

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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Sonork: 100.22446

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

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."

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.

Nnamdi Onyeyiri5-Sep-02 4:24

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."

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.

Nnamdi Onyeyiri5-Sep-02 5:48

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."

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