How to serialize more than one object? - C# Discussion Boards

Reanalyse2-Dec-05 21:23

2-Dec-05 21:23

Java Extractor is an unzipping application.
Is that what you are after, or are you looking for a Regex (find/sort text in text") approach ?

Re: help

eyalso2-Dec-05 22:24

eyalso

2-Dec-05 22:24

hi

i am looking for Regex (find/sort text in text") approach
in C#

eyalso

User-reorder ListViewItems by dragging?

wikoh2-Dec-05 5:17

wikoh

2-Dec-05 5:17

...Can this be done?

C# out-of-process COM component

london_ste2-Dec-05 4:55

london_ste

2-Dec-05 4:55

Not sure if this should be here or in the C# forum but here goes. I want to create an out-of-process COM component (like an ActiveX exe in VB6) in C# - does anybody know how to do this? I've created in-process COM component with no problems. Any ideas/links would be most appreciated.

Cheers

what is the meaning of "PublicKeyToken=null is not marked as serializable." ?

P. Gnana Prakash2-Dec-05 4:11

P. Gnana Prakash

2-Dec-05 4:11

Hi Friends,

In my C# application, i have tried to serialize some structured data using Soapformatter. While calling the serialize funciton i got the exception message like

"mscorlib....The type <appname>.<structurename> in Assembly <appname>, Version=1.0.2162.36249, Culture=neutral, PublicKeyToken=null is not marked as serializable."

What is the meaning of the message and how can i solve this issue ?

Regards,
Prakash.

A Journey of thousand miles must begin with a single step.

Re: what is the meaning of &quot;PublicKeyToken=null is not marked as serializable.&quot; ?

[Marc]2-Dec-05 6:26

[Marc]

2-Dec-05 6:26

The data you want to serialize does not has the Serializable attribute. The formatter wants something like this:

[Serializable()] public class SomeData {...}

Pompiedompiedom... Wink | ;)

"..Commit yourself to quality from day one..it's better to do nothing at all than to do something badly.."
-- Mark McCormick

Re: what is the meaning of &amp;quot;PublicKeyToken=null is not marked as serializable.&amp;quot; ?

P. Gnana Prakash2-Dec-05 18:36

P. Gnana Prakash

2-Dec-05 18:36

Thanks.... i solved my issue by putting the serializable attribute in fornt of the class name.

Regards,
Prakash.

A Journey of thousand miles must begin with a single step.

How to serialize more than one object?

ishlilith2-Dec-05 3:59

ishlilith

2-Dec-05 3:59

Suppose I have 2 multi dimensional arrays that I want to save to the hard drive, but I can only save one or the other, never both.
I have looked for a solution on the web and some books, and if I understood it correctly the code below should work, however it doesnt (maybe because I should use a constructor?).

Any advice besides serializing each array one by one?
Thanks for helping a complete novice.

    [Serializable]<br />
    public class test<br />
    {<br />
<br />
        public static int[,] arrtest = new int[1000, 1000];<br />
        public static int[,]lalala = new int[2000, 1000];<br />
    }<br />
    public class read<br />
    {<br />
        public void doWrite()<br />
        {<br />
            test per = new test(); //is the problem here?<br />
            IFormatter formatter = new BinaryFormatter();<br />
            Stream str = new FileStream("D:\\guardar.dat", FileMode.Create, FileAccess.Write);<br />
             formatter.Serialize(str, per); //or here?<br />
            str.Close();<br />
<br />
        }<br />
    }

Re: How to serialize more than one object?

mav.northwind3-Dec-05 22:43

mav.northwind

3-Dec-05 22:43

Hi!
Why did you declare your arrays as static?
When you convert your arrays into instance members, they should get serialized.
Another problem though: You're creating a new test right before serializing it. That way your arrays will be empty (i.e. filled with default value 0). I can't imagine that's what you want...

Regards,
mav

Using JPanel on Windows.Forms

sbozcan2-Dec-05 3:49

sbozcan

2-Dec-05 3:49

Hi! Is there a way to use JPanel on Windows.Forms? Sniff | :^)

If this is not possible, can i open a java window as a mdichild of my c# application?

Thanks..

How to write this C code in C#?

bouli2-Dec-05 2:44

bouli

2-Dec-05 2:44

Hello gurus,

I'd like to know how to translate this C code in C#?

<br />
WORD			calc=0;<br />
WORD			tmp=0;<br />
<br />
for (int i=0; i<m_nBlockSize; i++)<br />
{<br />
	tmp = ((calc ^ data[i]) & 0xF) * 0x1081;<br />
	calc = tmp ^ (calc >> 4);<br />
	tmp = ((calc ^ (data[i] >> 4)) & 0xF) * 0x1081;<br />
	calc = (tmp ^ (calc >> 4)) & 0xFFFF;<br />
}<br />
<br />
return calc & 0xFFFF;<br />

The return value is a 16 bytes value (a WORD).

Thanks in advance.

Best regards.

There is no spoon.

-- modified at 8:44 Friday 2nd December, 2005

Re: How to write this C code in C#?

Alvaro Mendez2-Dec-05 3:29

Alvaro Mendez

2-Dec-05 3:29

That code won't compile. What kind of for loop is that?

But I have the answer:

return (ushort)16;

Smile | :)

Regards,
Alvaro

I cannot take anything the Bush administration does seriously. The corruption, the cynical disregard for humanity, the cronyism and incompetence, all wrapped in a slimey flag of ultra-marketed nationalism repulses me. -- consdubya from fark.com.

Re: How to write this C code in C#?

bouli2-Dec-05 3:55

bouli

2-Dec-05 3:55

This loop calculates a 16 bits CRC.
It works perfectly in C++, but I have conversion problems in C#. The function must return a 2 bytes value.

I have converted like this, but I'm not sure it's the correct C# translation:

<br />
private Int16 CheckCRCHP(Byte[] data)<br />
{<br />
	Int16 calc = 0;<br />
	Int16 tmp = 0;<br />
<br />
	for (int i = 0; i < _blockSize; i++)<br />
	{<br />
		tmp = (Int16) (((calc ^ data[i]) & 0xF) * 0x1081);<br />
		calc = (Int16) (tmp ^ (calc >> 4));<br />
		tmp = (Int16) (((calc ^ (data[i] >> 4)) & 0xF) * 0x1081);<br />
		calc = (Int16) ((tmp ^ (calc >> 4)) & 0xFFFF);<br />
	}<br />
<br />
	return (Int16) (calc & 0xFFFF);<br />
}<br />

Best regards.

There is no spoon.

Re: How to write this C code in C#?

User 66582-Dec-05 4:07

User 6658

2-Dec-05 4:07

WORD = ushort, the rest should compile fine as far as I can see.

modified 12-Sep-18 21:01pm.

Re: How to write this C code in C#?

bouli2-Dec-05 4:11

bouli

2-Dec-05 4:11

Ok, it compiles and works fine with ushort Smile | :)

Thanks

There is no spoon.

Re: How to write this C code in C#?

mcljava2-Dec-05 7:07

mcljava

2-Dec-05 7:07

Bitmasks in C# are pretty simple, as noted you can use ushort or ulong depending on how many bits you need. That's probably the closest to C and gives you rapid conversion. However it's a good idea to avoid magic numbers and use constants instead. Less you get run over by the proverbial train and some poor soul has to figure out the rationale for your bit manipulations.

As an alternative you can also define your Bit Mask as a class with an enum. In c# an enum is equivalent to a uint, i.e. 32 bits. Thus you can mask off the high order bytes or take advantage of the extra bits for additional states. Normally I would only use a class if the bit manipulations were esoteric or voluminous. Nevertheless here is a quick example relative to your sample above:

class MyMaskOps<br />
{<br />
public enum eMyMask<br />
{<br />
   None          = 0,<br />
   State1        = 0x1,<br />
   State2        = 0x2,<br />
   State3        = 0x4,<br />
   StateRed      = 0x200,<br />
   StateBlue     = 0x400;<br />
   StateOrange   = 0x800,<br />
   AllStates     = 0xe07,<br />
   Multiplier    = 0x1081,<br />
   AllBits       = 0xffff<br />
}<br />
<br />
private eMyMask   mCalc = eMyMask.None;    // declare and clear mask<br />
private eMyMask   mTemp = eMyMask.None;    // declare and clear mask<br />
<br />
public eMyMask Calc<br />
{<br />
  set { mCalc  |= value; }<br />
  get { return mCalc; }<br />
}<br />
public eMyMask Temp<br />
{<br />
  set { mTemp  |= value; }<br />
  get { return mTemp; }<br />
}<br />
public eMyMask Xor(eMyMask msk, uint bits)<br />
{<br />
  return (msk ^ bits) & 0xf;<br />
}<br />
public eMyMask And(eMyMask msk, uint bits)<br />
{<br />
  return msk & bits;<br />
}<br />
public eMyMask Mul(eMyMask msk, uint bits)<br />
{<br />
  uint tmp = msk * bits;<br />
  return (eMyMask)tmp;<br />
}<br />
public ushort DoCalc(uint[] data)<br />
{<br />
  mCalc = eMyMask.None;<br />
  mTemp = eMyMask.None;<br />
<br />
  for (int i = 0; i < data.Length; ++i)<br />
  {<br />
    mTemp = Mul(Xor(mCalc, data[i]), eMyMask.Multiplier);<br />
    mCalc = Xor(mTemp, (mCalc >> 4));<br />
    mTemp = Mul(Xor(mCalc, (data[i] >> 4)), eMyMask.Multiplier;<br />
    mCalc = And(Xor(mTemp, (mCalc >> 4)), eMyMask.ShortBits);<br />
  }<br />
  <br />
  ushort result = (ushort)And(mCalc, eMyMask.ShortBits);<br />
  return result;<br />
}<br />
} // class<br />

Mike

Re: How to write this C code in C#?

bouli2-Dec-05 9:24

bouli

2-Dec-05 9:24

Hi Mike,

I don't play much with CRC functions, actually I took it from another project Wink | ;)

But for sure, your sample code looks to me as the C# way Smile | :)

I like it

Also, for doing an 8 bits CRC I don't think that a class could be done as the loop is 2 lines, but maybe the class you gave me can be extended with other CRCs. It could be interested to develop a class with most CRCs inside (maybe it already exist)

best regards.

There is no spoon.

Marshal an array of fixed length strings

mintguy2-Dec-05 2:35

mintguy

2-Dec-05 2:35

How do i marshal an array of strings. I'm trying to do it as below.

I have a I C dll with a C structure I want to pass

[code]
#define MAX_KEYWORDS 50
#define KEYWORD_LENGH 20

struct KeywordListStruct
{
char ks_keywords[MAX_KEYWORDS][KEYWORD_LENGH];
};
[/code]

and a function I want to export

[code]
// ...

#define MYEXPORT_API __declspec(dllexport)

// ...

MYEXPORT_API int Tester(KeywordListStruct& testStruct)
{
int retval = 0;

// do stuff

return retval;
}
[/code]

and I want to call this from a C# app

[code]
namespace DllImports
{

[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)]
public struct KeywordStruct
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst =
Imports.KEYWORD_LENGTH)] public String keyword;
}

[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)]
public struct KeywordListStruct
{
[MarshalAs(UnmanagedType.ByValArray, SizeConst = Imports.MAX_KEYWORDS)] public KeywordStruct[] words;
}

public class Imports
{
DllImport("KeywordDLL.dll", EntryPoint="Tester", SetLastError=true,
CharSet=CharSet.Ansi, ExactSpelling=true,
CallingConvention=CallingConvention.StdCall)]
public static extern short Tester(ref KeywordListStruct rTest);

public const int MAX_KEYWORD_LENGTH = 20;
public const int MAX_KEYWORDS = 50;

}

[/code]

Which I call as follows
[code]

//...

KeywordListStruct kl = new KeywordListStruct();

//...

Imports.Tester(ref kl);

[/code]

but I get the following runtime error.

An unhandled exception of type 'System.TypeLoadException' occurred. Additional information: Can not marshal field words of type DllImports.KeywordListStruct: This type can not be marshaled as a structure field.

Can anyone help?

Dispose the parent form as soon as the child opens?

MudkiSekhon2-Dec-05 1:45

MudkiSekhon

2-Dec-05 1:45

Hi friends,
Plz give me the code for calling child form in which the parent windows form dispose as the child takes the control............

Thanks,
Sandeep
+919891027854

Re: Dispose the parent form as soon as the child opens?

Dave Kreskowiak2-Dec-05 7:35

Dave Kreskowiak

2-Dec-05 7:35

You can't do that. If you dispose the parent form, all it's child die with it.
If you dispose the startup form, your entire application closes with it.

I take it you're trying to implement some kind of splash screen or login form?

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: Dispose the parent form as soon as the child opens?

MudkiSekhon2-Dec-05 17:52

MudkiSekhon

2-Dec-05 17:52

Thanx 4 ur reply.
Yes, I am trying to implement login form where the login form will disappear after the user had logged in..

Thanks,
Sandeep
+919891027854

Re: Dispose the parent form as soon as the child opens?

Dave Kreskowiak4-Dec-05 6:00

Dave Kreskowiak

4-Dec-05 6:00

Your startup form is your applications main form.

When your app starts, your main form can check to see if someone logged in. If not, show the login form. If so, continue as normal.

There's a bunch of information on this. All you have to do is search[^].

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Colors?

thomasa2-Dec-05 1:37

thomasa

2-Dec-05 1:37

Does someone konw how I can create a color from #ffcc00?

Something like

<br />
Color aColor = Color.FromName("#ffcc00"); // this dosen't work<br />

Thanks
Thomas

Re: Colors?

Maqsood Ahmed2-Dec-05 2:07

Maqsood Ahmed

2-Dec-05 2:07

Hello,
Try to explorer Color.FromArgb(int argb) method. You can convert this string to a Hexadecimal number and pass it to above mentioned method
HTH, Cheers

Maqsood Ahmed - MCAD.net
Kolachi Advanced Technologies
http://www.kolachi.net

Re: Colors?

User 66582-Dec-05 3:37

User 6658

2-Dec-05 3:37

FromARGB should work. Make sure to convert the hexadecimal string into the 4 color representations first.

modified 12-Sep-18 21:01pm.

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