C#

Re: C#

Alex Manolescu7-Feb-10 10:46

Alex Manolescu

7-Feb-10 10:46

Example:

In C you write:

int x=1;
cout << "Number:" << setw(20) << x << endl;

In C# you write:

int x=1;
Console.WriteLine(String.Format("{0:D}", x).PadLeft(20));

Cheer's,
Alex Manolescu

Re: C#

harold aptroot7-Feb-10 11:37

harold aptroot

7-Feb-10 11:37

Or Console.WriteLine("{0,20}", x)

Re: C#

Not Active7-Feb-10 12:04

Not Active

7-Feb-10 12:04

How to get an answer to your question[^]

Pay attention to #3. C# as the subject for a post in the C# forum is ridiculous and lazy.

I know the language. I've read a book. - _Madmatt

how to convert sample rate of a wav file using directshow

g3ng7-Feb-10 8:46

g3ng

7-Feb-10 8:46

Hi, I want to add a "convert samplerate" function to a program that process wav files and I heard that Directshow already has such a function but I couldn't find any info. Does anyone know how to use it? Or is there any other options(without having to use other programs to convert it before loading the file)? (The program is written in C#.)

Thanks~

How can i track the menu item selection in C#

Chiman17-Feb-10 8:29

Chiman1

7-Feb-10 8:29

In C++ we have TrackPopupMenuEx() function to displays a shortcut menu at the specified location and tracks the selection of items on the shortcut menu.

How can i track the menu item selection in C#.

How can i archive similar functionality in C#.

Sample application appreciated.

Re: How can i track the menu item selection in C#

Dan Mos7-Feb-10 8:53

Dan Mos

7-Feb-10 8:53

In c# a context menu will be the similar one.

It has a Checked property that you could use:

treat the ClickEvent with something like this:

ToolStripMenuItem ts = sender as ToolStripMenuItem;
           if (ts.Checked) { ts.Checked = false; }//if it was checked unchekc it
           else { ts.Checked = true; }//else check it

Now you can use a foreach or something to retrive the checked items. Something like:

foreach (ToolStripMenuItem item in contextMenuStrip1.Items)
            {
                if(item.Checked)//do stuff
            }

How to pass delegate as a parameter

Chiman17-Feb-10 7:43

Chiman1

7-Feb-10 7:43

Hi,

I am new to C# , Please suggest the approach.

I have written below code .

public class A
{
public B obj = new B();
public delegate int delegateCalculate(int i, int j);

delegateCalculate dc ;

public int Add(int Num1 , int Num2)
{
return (Num1 + Num2);
}

public int Sub(int Num1, int Num2)
{
return (Num1 - Num2);
}

public void Display()
{
dc = this.Sub;
obj.Result(dc); //error
}

}

public class B
{
public int Num1 = 10 ;
public int Num2 = 20 ;
public delegate int Calc (int i,int j);
public int Result(Calc dc)
{
int ii = dc(Num1, Num2);
return ii;
}
}

The above code gives error for obj.Result(dc); call.
Please suggest how to call Result() of class B in class A.

Re: How to pass delegate as a parameter

Abhinav S7-Feb-10 8:16

Abhinav S

7-Feb-10 8:16

One way to do this would be using the Action tag.
Have a look here[^].

Me, I'm dishonest. And a dishonest man you can always trust to be dishonest.
Honestly. It's the honest ones you want to watch out for...

Re: How to pass delegate as a parameter

harold aptroot7-Feb-10 8:32

harold aptroot

7-Feb-10 8:32

Delegates are not equivalent when they just share the same signature, you could do this if you declare only one delegate type and use that in both places.
Delegate declarations do not have to be inside a class.

word en c#

tchiloh7-Feb-10 7:15

tchiloh

7-Feb-10 7:15

I want make a application that prints repports.

what is the best method to put data in word or modify word document?

from c# --> xml --> word or
c# --> word
or a another method?

Re: word en c#

Not Active7-Feb-10 7:21

Not Active

7-Feb-10 7:21

Manipulating Word 2007 Files with the Open XML Format API[^]

http://msdn.microsoft.com/en-us/office/aa905482.aspx[^]

I know the language. I've read a book. - _Madmatt

Calculation Problem (Minus One)

dataminers7-Feb-10 6:49

dataminers

7-Feb-10 6:49

double myVal = Math.Pow(10, 38);
txtResult.Text = String.Format("{0:n}", myVal);

double myVal = Math.Pow(10, 38) - 1;
txtResult.Text = String.Format("{0:n}", myVal);

Both of theme result is same;
100.000.000.000.000.000.000.000.000.000.000.000.000,00

But first example formula contain "-1"

Re: Calculation Problem (Minus One)

Richard MacCutchan7-Feb-10 7:07

Richard MacCutchan

7-Feb-10 7:07

This is a 'feature' of floating point numbers which are generally an approxmation of their integer values. While you can hold much larger (and smaller) values in double or float, you lose precision as a consequence. Refer to this article[^] for details. If you want large numbers with accuracy then you need to use BigInt or similar.

MVP 2010 - are they mad?

Re: Calculation Problem (Minus One)

Dan Mos7-Feb-10 7:15

Dan Mos

7-Feb-10 7:15

That is because your myVal exceds the maximum value representable by a double(without the scientific notation).

If you use it with a smaller number => ok.

try using a decimal number and you'll see that it will thorw an exception(value too large).

Your value is actually 1.0E +38

problem with writing an event log

tasumisra7-Feb-10 4:51

tasumisra

7-Feb-10 4:51

Hi Guys,

I am writing an application where i need to log errors and some information,so for this i have written a class that is working perfectly fine when in debug and in re;ease mode but when i am making an exe and trying same application logs have not been written.

am using
string baseDir = AppDomain.CurrentDomain.BaseDirectory +
AppDomain.CurrentDomain.RelativeSearchPath;

to retrive the directory location...

can you guide me where i am lost.

Thanks
Vikas

vikas da

Re: problem with writing an event log

jojoba20107-Feb-10 5:07

jojoba2010

7-Feb-10 5:07

Can u write down or Upload this class !
So we can see where is the problem ?

Re: problem with writing an event log

Luc Pattyn7-Feb-10 5:19

Luc Pattyn

7-Feb-10 5:19

Hi,

check the value of baseDir;
does it end on a backslash?
does the folder exist?
can you create a file there?

why don't you use Environment.GetSpecialFolder? ApplicationData is probably what you want.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly formatted, adding PRE tags is the easiest way to obtain that.
[The QA section does it automatically now, I hope we soon get it on regular forums as well]

Re: problem with writing an event log

tasumisra7-Feb-10 18:36

tasumisra

7-Feb-10 18:36

Hi Luc,

while debugging i have checked the following

check the value of baseDir;
it comes with right path
does it end on a backslash?
yes it end with \\
does the folder exist?

yes the folder exist and it none but the base directory of my code path

can you create a file there?

yes files created there when running in debug or release mode

but when ever i am making an exe and installing it to another system files are not created.

vikas da

Re: problem with writing an event log

Dan Mos7-Feb-10 5:25

Dan Mos

7-Feb-10 5:25

You could try:

Application.StartupPath

The only difference is in the "\" so

Application.StartupPath => "C:\Data\Blah"
and
AppDomain.CurrentDomain.BaseDirectory => "C:\Data\Blah\"

As for the AppDomain.CurrentDomain.RelativeSearchPath:

if you do not create it specifically in code something like this:

domain.AppendPrivatePath("MyCustomAssembly");

it will return empty string.

Re: problem with writing an event log

Not Active7-Feb-10 6:19

Not Active

7-Feb-10 6:19

tasumisra wrote:
,so for this i have written a class

Why reinvent the wheel? There are plenty good frameworks for this already like, Enterprise Library, whose pupose is to create a library of common tasks to save developers from having to recreate it each time.

I know the language. I've read a book. - _Madmatt

Set current form to hide [modified]

nuttynibbles7-Feb-10 2:31

nuttynibbles

7-Feb-10 2:31

Hi,

I open and hide form using form.showdialog() and form.hide();

How do i detect if the current form is hidden, and if it's hidden don't do this.

modified on Sunday, February 7, 2010 8:41 AM

Re: Set current form to hide

OriginalGriff7-Feb-10 2:36

OriginalGriff

7-Feb-10 2:36

To hide the form use the Form.Hide method. To show it again use Form.Show
Simple, no?

If Barbie is so popular, why do you have to buy her friends?

Eagles may soar, but weasels don't get sucked into jet engines.

If at first you don't succeed, destroy all evidence that you tried.

Re: Set current form to hide

nuttynibbles7-Feb-10 2:58

nuttynibbles

7-Feb-10 2:58

hey OriginalGriff,

Tks for the reply. i have edited my question to make it more clear.

I open and hide my form using form.show and form.hide

how do i check if the current form is hidden so as not to perform certain task

Re: Set current form to hide

Lutosław7-Feb-10 3:19

Lutosław

7-Feb-10 3:19

The property form.Visible determines whether a form is visible (shown).

Greetings - Jacek

Re: Set current form to hide

nuttynibbles7-Feb-10 3:34

nuttynibbles

7-Feb-10 3:34

Great. It works. tks Jacek