C# Discussion Boards - CodeProject

5-Jun-09 21:44

Hi All,
i created a painter program, with classes and all shapes.
i save the shapes in arraylist for undo redo.
i tried to serialize the objects using the following code,
just to see if it works, and i get error

using System;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Collections; // for using ArrayList to save shapes
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace PaintBrush
{
    public class SaveBinary
    {
        // Create file to save the data
        FileStream fs = new FileStream("Data", FileMode.Create);
        // Create binary formatter object:
        BinaryFormatter BF = new BinaryFormatter();
        BF.Serialize(fs, "1234");
        fs.Close();
    }
}

it won't recognize BF at all, and i don't see why (using visual studio 2008)
Error on compile:

C:\Documents and Settings\Admin\My Documents\Visual Studio 2008\Projects\PaintBrush\PaintBrush\Serialize.cs(23,21): error CS1519: Invalid token '(' in class, struct, or interface member declaration
C:\Documents and Settings\Admin\My Documents\Visual Studio 2008\Projects\PaintBrush\PaintBrush\Serialize.cs(23,24): error CS1519: Invalid token ',' in class, struct, or interface member declaration
C:\Documents and Settings\Admin\My Documents\Visual Studio 2008\Projects\PaintBrush\PaintBrush\Serialize.cs(24,17): error CS1519: Invalid token '(' in class, struct, or interface member declaration

Compile complete -- 3 errors, 0 warnings
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Thanks,
Retaliator

Christian Graus5-Jun-09 21:55

5-Jun-09 21:55

Buy a very basic book on C#, preferably one with pictures, and read it.

alonchap wrote:
public class SaveBinary
{
// Create file to save the data
FileStream fs = new FileStream("Data", FileMode.Create);
// Create binary formatter object:
BinaryFormatter BF = new BinaryFormatter();
BF.Serialize(fs, "1234");
fs.Close();
}

Can you honestly not see what's wrong here ? You're writing code inside the class declaration, but not inside a method. Your code is invalid, which is what the compiler told you.

Christian Graus

Driven to the arms of OSX by Vista.

Please read this[^] if you don't like the answer I gave to your question.

"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.

alonchap5-Jun-09 22:21

5-Jun-09 22:21

Hey i did not notice, just saw it now,
so it's working basiclly i can save a string now and deserialize as well,
how would i do a loop to serialize each object (class which is shape) inside the array list?

Christian Graus5-Jun-09 22:52

5-Jun-09 22:52

I would serialise the entire array, and then deserialise it as an array also.

alonchap5-Jun-09 23:00

5-Jun-09 23:00

Can you point how? coz it needed casting or something because it did not allow serialize the ShapesList (which is the arraylist)

Christian Graus5-Jun-09 23:35

Re: Serializing objects in c# [modified]

5-Jun-09 23:35

The ArrayList class sucks, don't use it. I suspect if you use a generic list, it will work fine, b/c it is strongly typed and will know it's contents can be serialised. If not, just build an array, and serialise that.

alonchap6-Jun-09 7:09

C# and C++ Win32 Console app Interop

6-Jun-09 7:09

I Managed, thanks

modified on Saturday, June 6, 2009 5:08 PM

indikat5-Jun-09 21:18

5-Jun-09 21:18

Hi,
This is my scenario. I have a Win32 console application and I would like to call functions in this project by a C# widows application. I have tried p/invoke but I seem to get an error saying that the entry point was not found. Added the C++ project to the C# solution but couldn't get it working. Any suggestions on how to get it working ?

Thanks in advance,
indikat

Garth J Lancaster5-Jun-09 21:37

Garth J Lancaster

5-Jun-09 21:37

indikat wrote:
I have tried p/invoke but I seem to get an error saying that the entry point was not found.

yeah - a console app doesnt expose 'entry points' (well, I guess you could call 'main' an entry point, but that doesnt help you )

it sounds like what you really need is to put the functions (assuming you have the source) from the console app into a dll. If you cant do that, then you need to do something like run the console app as a process and capture stdout etc to get the results back ..

'g'

indikat6-Jun-09 1:04

6-Jun-09 1:04

I'll try and add the necessary functions into a dll. Is there any way that I can add the C++ project to the solution and use the C++ functions from C# project ?

indikat

Garth J Lancaster6-Jun-09 14:59

Garth J Lancaster

6-Jun-09 14:59

not really, if you want to keep them in c or c++ - you must export them from a dll - or you could simply re-write them in c#

indikat6-Jun-09 18:56

6-Jun-09 18:56

Thanks for the info. I have managed to create a dll and export the needed function.
Might need to rewrite the code in C# later on.

indikat

Garth J Lancaster6-Jun-09 19:56

Garth J Lancaster

6-Jun-09 19:56

well done - so, now all you need to do is use p/invoke dllimport .. this may be of help (only had a quick look, there may be better examples around)

http://msdn.microsoft.com/en-us/library/aa288468.aspx[^]

indikat7-Jun-09 5:01

Re: news management system

7-Jun-09 5:01

Thanks for the link

news management system

harispa5-Jun-09 21:06

harispa

5-Jun-09 21:06

hi..i am doing a project named as news mangement system.it is mainly aimed at the content manipulation of a web news paper on the internet.the technology used are asp.net with c# using ajax,web services,sql server 2000.i am beginner and i need ur help to complete my project.i hope u will give me the suitable suggestions and helps to me. Smile | :)

Christian Graus5-Jun-09 21:55

Adding datagridview columns

5-Jun-09 21:55

You will find all the help you need here[^].

michaelgr15-Jun-09 20:27

5-Jun-09 20:27

Hello,
I need to add datagridviewcolumns in a loop. For example:

string[] default_columns { "VlFile", "EquipName", "JobName", "NickName", "Operator", "EquipmentStartTime", "JobComment", "EquipTypeDesc" };
foreach (string s in default_columns)
{
  //Here i need to add the a column with the name in S                   
}

The columns need to be bounded. I have the bound source and all this but the problem is adding the columns.
It will loop me through the array (default_columns) and will add this columns.

How can i do it?
I mean there is a problem because i need to declare a variable

MickCurley5-Jun-09 21:28

MickCurley

5-Jun-09 21:28

I would create a datatable and point the datagridview to it

DataTable DT = new DataTable();

foreach (string s in default_columns)
{
    DataColumn NewCol = new DataColumn(s);
    DT.Columns.Add(NewCol);                
}

DataGridView.DataSource = DT;

Regards
Mick Curley

Smile | :)

michaelgr15-Jun-09 21:31

5-Jun-09 21:31

OK but i load data to the datagridview from a database. And i need the columns to be bound to the database.
I declared the database (datatable) as a bindingsource to the datagridview.
But i need to add columns in the program (the user will choose which columns he wants to see)

MickCurley5-Jun-09 21:39

MickCurley

5-Jun-09 21:39

I dont understand what your trying to do.
If you load the data from your Database table into a DataTable
haven't you got a reference to the columns within that DataTable?

Regards
Mick Curley

Smile | :)

michaelgr15-Jun-09 21:45

5-Jun-09 21:45

I have an empty datagridview (without columns declared- in the wizard of the datagridview).
The user choses which columns he wants to see from the database (using a listbox that i save the items in an array).
I want to add columns to the datagridview from this array (that was created from the listbox). The problem is that i need them to be bound to that datatable.
So i do in the foreach loop

datagridview.Columns.Add(s, s);

it creates me the columns right but they are not filled with data from the database.

If i do:
datagridviewcolumn col=new datagridviewtextboxcolumn();
col.headertext="abc";
col.datapropertyname="abc";
col.name="abc";

It does creates me the column and filles it with data.
But i need to do it in a loop that will go through all the items in the array (from the listbox) and add this columns
But i can use the same name to the datagridviewcolumn (datagridviewcolumn col=new datagridviewtextboxcolumn();), Because if i do it it says i already have this column (even if i change it's name in the loop)

michaelgr15-Jun-09 21:49

5-Jun-09 21:49

I think i managed the problem. I had to declare the datagridviewcolumn
(datagridviewcolumn col=new datagridviewtextboxcolumn();)
inside the foreach loop (i declared it outside) and in this way it declares a ned datagridviewcolumn for each item in the loop.