C# Discussion Boards - CodeProject

Meysam Mahfouzi1-Apr-05 0:50

1-Apr-05 0:50

Does anybody know any .net image processing library implementing famous filters like "Haar Wavelet"? If not, do you know any powerful Math library which helps to implement such filters?
Regards

How to find details of functionality exported by legacy dll

Rama Sharma1-Apr-05 0:35

Rama Sharma

1-Apr-05 0:35

How to find out details of the functionality exported by a legacy dll (which may not be a COM etc., which means it cannot be referenced from .NET project)? Is there any utility which can give details of the functions and data types etc. of such a legacy DLL?

Re: How to find details of functionality exported by legacy dll

GaMBiT_KC1-Apr-05 0:55

GaMBiT_KC

1-Apr-05 0:55

I use ildasm.exe find it in your SDK directory under bin.

It will give you the attributes and methods/classes exposed by DLL!

GaMBiT---> aND ReVeNGe WiLL Be

Re: How to find details of functionality exported by legacy dll

Rama Sharma1-Apr-05 17:46

Rama Sharma

1-Apr-05 17:46

ILDASM.EXE does not work on a legacy dll and it gives the error "... does not contain CLR header and therefore it cannot be disassembled."

Any solution please?

Re: How to find details of functionality exported by legacy dll

GaMBiT_KC2-Apr-05 1:03

GaMBiT_KC

2-Apr-05 1:03

sorry to hear that! but I always used ildasm and never found any problem!
The least I can tell you is this:

go to a C# reflection tutorial and write a program to get the attributes/methods/classes at run time!

it's pretty easy, and you should get all the info you need.

Far from that I don't no! Cry | :((

GaMBiT---> aND ReVeNGe WiLL Be

Re: How to find details of functionality exported by legacy dll

mav.northwind1-Apr-05 1:48

mav.northwind

1-Apr-05 1:48

DependencyWalker[^] can show you the functions exported by a DLL.
Usually you won't be able to determine the number and type of parameters a function expects, because legacy DLLs didn't expose such meta information.

mav

Receiving data from variable from another form [* Resovled *]

steve_rm31-Mar-05 23:08

steve_rm

31-Mar-05 23:08

Hello,

I have 2 forms. One is called librarySettings, and another one is called loanBook. When the user wants to loan a book, l want to be able to receive 2 variables from this form, which is DaysBorrowed, and OverdueFine. This way if the settings are changed then the loanbook form will have the updated variables.

This is what l have done, and l have done this before, but can't seen to get it to work. Don't know what is going on here.

LibrarySettings form.

[code]
This load the variables data from a database, so that the settings can be updated to a database.
private void frmLibrarySettings_Load(object sender, System.EventArgs e)
{
try
{
cnn.Open();

OleDbCommand cmd = cnn.CreateCommand();
OleDbDataAdapter da = new OleDbDataAdapter();
DataTable dt = new DataTable();

cmd.CommandType = CommandType.Text;
cmd.CommandText = "SELECT * FROM LibrarySettings";

da.SelectCommand = cmd;
da.Fill(dt);

upDDays.Value = Convert.ToInt16(dt.Rows[0]["Days"]); //load into a numericUpDown control
upDFine.Value = Convert.ToInt16(dt.Rows[0]["Fine"]);
}
catch ( OleDbException ex )
{
MessageBox.Show(ex.Message);
}
catch ( Exception ex )
{
MessageBox.Show(ex.Message);
}
}
[/code]

//Set up 2 public procedures
[code]
public int fineAmount
{
get
{
return Convert.ToInt16(upDFine.Value);
}
}

public int DaysToBorrow
{
get
{
return Convert.ToInt16(upDDays.Value);
}
}
[/code]

That is all for the library settings form

for the loanbook form.

I have declared this in the form at the top of the class

<br />
frmLibrarySettings getLibraryDetails = null; //Finds the day and fine amount that has been set in the library settings form<br />

Find out how long the book can be loaned for.

<br />
int loanDays = 0;<br />
loanDays = getLibraryDetails.DaysToBorrow; //Get the days the book can be loaned for - error occurs here<br />

The error message l get when this code is executed is " Object reference not set to an instance of an object."

Not sure what l am doing wrong. Hope someone can help

Thanks in advance,

Steve

Re: Receiving data from variable from another form.

spif200131-Mar-05 23:22

spif2001

31-Mar-05 23:22

frmLibrarySettings getLibraryDetails = null;

and then:

loanDays = getLibraryDetails.DaysToBorrow; //getLibraryDetails still null?

??

u can't get a property value from an object that hasn't been initialized

Re: Receiving data from variable from another form.

steve_rm31-Mar-05 23:36

steve_rm

31-Mar-05 23:36

Thanks for the reply,

I am coming from VB so not sure if what l am doing is correct. Do l have to initial the object in the constructor?

Any sample code would help.

Thanks for your help,

Steve

Re: Receiving data from variable from another form.

spif200131-Mar-05 23:46

spif2001

31-Mar-05 23:46

Make a global variabel i.e. private frmLibrarySettings getLibraryDetails;

in the constructor initialize it: frmLibrarySettings getLibraryDetails = new frmLibrarySettings(/*parameters?*/);

now u can call functions and properties on getLibraryDetails from anywhere inside the class

Re: Receiving data from variable from another form.

spif200131-Mar-05 23:47

spif2001

31-Mar-05 23:47

alternatively u can initialize it in the XXX_load function

Re: Receiving data from variable from another form.

steve_rm1-Apr-05 0:30

steve_rm

1-Apr-05 0:30

Thanks for your help,

frmLibrarySettings getLibraryDetails = new frmLibrarySettings();

Was the answer

Re: Receiving data from variable from another form [* Resovled *]

GaMBiT_KC1-Apr-05 0:51

GaMBiT_KC

1-Apr-05 0:51

Well if I am doing that for me...I would use a simple Object Oriented approach.

1. make a local variable in your second form for the information you need to gather.
2. write 2 simple methods to get and set that information.
3. when calling the second form after all processing just write

<variable> = <form_variable>.getXXX();

for example say I have a form to get a point from the user and it have this in the second form:
...form declarations
int x;
int y;
.....
....
public void setX(int x)
{
this.x = x;
}
public int getX()
{
return x;
}

....from the other (first) form just do:

int x;
x = form2.getX();
int y;
y = form2.getY();

by the way...the set x is there so that you can manipulate it later on!

GaMBiT---> aND ReVeNGe WiLL Be

SendKeys in a Service ?

Member 80056931-Mar-05 19:20

Member 800569

31-Mar-05 19:20

Hi
I have made a service in C# from where I would like to send keystrokes to the application in focus.
I have tried to use the SendKeys class calling the function
SendKeys.SendWait
When I do that I get an exception "unable to create hook"
Can anybody give me a hint how to solve that ?

Thanks
Brian

Re: SendKeys in a Service ?

James Poulose31-Mar-05 20:26

James Poulose

31-Mar-05 20:26

hi,
You cannot send keystrokes to an Interactive Session of windows from a Service. Because that (Service)runs on a diffrent session. If you need to send some response to the interactive session you can consider using sockets or some other Inter Process Communication (IPC) techiniques.

James

James Poulose

Wrapper Class For Third Party tools

Prabhakar.A31-Mar-05 18:23

Prabhakar.A

31-Mar-05 18:23

Hi,
Any one can Help me How to Write a Wrapper Class For third Party(Infragistics) tools,

Since I am New to this Please Help me

Regards
Prabhakar.A

Prabhakar.A
Software Engineer

Re: Wrapper Class For Third Party tools

Kodanda Pani31-Mar-05 19:05

Kodanda Pani

31-Mar-05 19:05

Hi ,

Guess you can use adapter pattern for this. Can you please check the url dofactory for more info on this.

Thanks
SGS

ignoring a class in XML Serialization

RajivJain31-Mar-05 17:41

RajivJain

31-Mar-05 17:41

Hi,
I want to ignore a class tag and serialize the object inside this ignored class. can someone help me do that. i tried using xmlignore but it ignores that class completely. instead i dont want to serialize that class as parent tag and i want the object and variable inside this class to serialize. can u help?
bye
RJ

RJ

Re: ignoring a class in XML Serialization

Sebastian Schneider31-Mar-05 17:45

Sebastian Schneider

31-Mar-05 17:45

Im not sure what you are talking about, sorry. Object inside? You should watch what you are saying, Intel is quick with sueing people nowadays Wink | ;)

Cheers
Sid

Re: ignoring a class in XML Serialization

RajivJain31-Mar-05 17:55

RajivJain

31-Mar-05 17:55

Consider this example XML

<country>
<city>
<name>India

to serialize this i have a class "Address" which has a data member of class "Country" inside which i have a data member of class "City" and inside class "City" i have a string variable "Name". Now if i have to serialize i have to send a object of class "Address" and after serialization i get a XML as given above but i want a output as this

<city>
<name>India

i dont want "Country" tag. for this if i give XMlIgnore Attribute for "Country" it ignores everything inside this class for example "City" tag. I hope this would have made my problem clear.

Re: ignoring a class in XML Serialization

RajivJain31-Mar-05 17:56

RajivJain

31-Mar-05 17:56

hey the browser parses this xml example i gave above.

Re: ignoring a class in XML Serialization

Sebastian Schneider31-Mar-05 18:06

Sebastian Schneider

31-Mar-05 18:06

Well, at least this means its valid XML Wink | ;)

Re: ignoring a class in XML Serialization

Sebastian Schneider31-Mar-05 17:58

Sebastian Schneider

31-Mar-05 17:58

Why dont you simply write your own Serializer, which would then output what you want and ignore what you dont need?

Cheers
Sid

Re: ignoring a class in XML Serialization

RajivJain31-Mar-05 18:07

RajivJain

31-Mar-05 18:07

thanxs...
this may be a silly question can u tell me how can i write my own serializer...

RJ

Re: ignoring a class in XML Serialization

RajivJain31-Mar-05 18:01

RajivJain

31-Mar-05 18:01

Generated XML
< Address >
< Country >
< City >
< Name > India </Name >
< /City >
< /Country >
< /Address >

Required XML

< Address >
< City >
< Name > India </Name >
< /City >
< /Address >

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