file operation problem - C# Discussion Boards

Re: file operation problem

4-Dec-07 23:49

Hi!
System.Environment.SpecialFolder.CommonApplicationData (or rather a subdirectory thereof) is the right folder for you.

Regards,
mav

--
Black holes are the places where God divided by 0...

Re: Vista file access

Pete O'Hanlon5-Dec-07 3:16

Pete O'Hanlon

5-Dec-07 3:16

You could always use the IsolatedStorage classes.

Deja View - the feeling that you've seen this post before.

My blog | My articles

Re: Vista file access

David Knechtges5-Dec-07 4:07

David Knechtges

5-Dec-07 4:07

We have just run into this same issue. We are now storing the docs under All Users\Application Data. This works for Win2000, XP, 2003 and Vista.

Under Vista, this is redirected through a junction to the folder c:\ProgramData.

If you want backward compatibility, use the All Users\Application Data path, otherwise, you could use the ProgramData path.

David

file operation problem

leovava4-Dec-07 23:17

leovava

4-Dec-07 23:17

The following program reads from a text file containing numeric data stored in columns separated by one blank space. Write the code and compile it on your computer. Create a text file called myfile.txt containing a few columns (3?5 for example) of numeric data (real numbers) and test the program.
#include <stdio.h>
int main(void)
{
FILE *fp;
double val;
char ch;

fp = fopen("myfile.txt","r");
do{
fscanf( fp, "%lf", &val );
ch = getc(fp);
printf(" %lf",val);
if ( ch=='\n' || ch==EOF )
printf("\n");
} while ( ch != EOF );
fclose(fp);
return 0;
}
Modify the code so that the program additionally creates a new text file where it stores only the integer part (discard the factionary part) of the real numbers stored in myfile.txt. The new file should write data in the same format (3?5 with columns separated by space) as the original file. Include statements to check if the file was opened and closed successfully.

CKnig5-Dec-07 0:47

CKnig

5-Dec-07 0:47

Are you aware that:
- this is the C# (not the C/C++) formum
- we don't tend to make others homework for them
- you didn't even give a qustion

So this looks like:
- you are so lazy with your homework that you can't even be bothered to type a question
- and you don't even took you time to find the right forum

Conclusion:
I won't help either Wink | ;)

update desktop project from web

greekius4-Dec-07 22:36

greekius

4-Dec-07 22:36

Hi code-lovers Big Grin | :-D

i want my programs as users can update their programs -i developed- from web, like "windows update"

how could i do?

Re: update desktop project from web

Jacky Yiu4-Dec-07 23:47

Jacky Yiu

4-Dec-07 23:47

Build > Publish %Your Project Name%

If you publish it to web, the program at client desktop will auto check the version number and update from the source url.

Loading treeview from database using BackGroundWorker class

D i x y4-Dec-07 22:34

D i x y

4-Dec-07 22:34

How to load treeview control from database using backgroundworker class.

Re: Loading treeview from database using BackGroundWorker class

mav.northwind4-Dec-07 23:50

Re: Loading treeview from database using BackGroundWorker class

4-Dec-07 23:50

What do you have already?

And please don't start a new thread for the same question every hour, that's considered rude.

Regards,
mav

--
Black holes are the places where God divided by 0...

Jacky Yiu5-Dec-07 0:02

Jacky Yiu

5-Dec-07 0:02

Add a "DoWork" event to the backgroundWorker
fire backgroundWorker.RunSync(DataSet);
just paste the code in backgroundWorker_DoWork is fine

Contains dows not work properly...?

Pankaj - Joshi4-Dec-07 22:16

4-Dec-07 22:16

Hello experts,

I have a combo box with 26 items. Say A....Z.

I have another string that holds the item to match

I write following code..but it is not working why...?

strItemToMatch="C";
boolean isFound=false;

if (ComboBox1.Items.Contains(strItemToMatch.ToString()))
isFound=True;
else
isFound=False;

Regards
Pankaj Joshi

If you want to shape your dreams into reality, please wake-up...

dan!sh 4-Dec-07 22:52

dan!sh

4-Dec-07 22:52

Change
if (ComboBox1.Items.Contains(strItemToMatch.ToString()))
to
if (ComboBox1.Items.ToString().ToUpper().Contains(strItemToMatch.ToString().ToUpper()))

Hope it helps

Until you realize this message has nothing to say, its too late to stop reading

Not working yet????

Pankaj - Joshi4-Dec-07 23:03

4-Dec-07 23:03

I write this

if (Convert.ToBoolean(cmbSubItem.Items.ToString().ToUpper().Trim().Contains(itemlist[0].ToString().ToUpper().Trim())))

But this is also not working...

Regards
Pankaj Joshi

If you want to shape your dreams into reality, please wake-up...

mav.northwind4-Dec-07 23:22

4-Dec-07 23:22

d@nish wrote:
if (ComboBox1.Items.ToString().ToUpper().Contains(strItemToMatch.ToString().ToUpper()))

Sorry to say, but that's complete nonsense. ComboBox1.Items.ToString() will give you "System.Windows.Forms.ComboBox+ObjectCollection", so you send him down the wrong road. Dead | X|

Regards,
mav

--
Black holes are the places where God divided by 0...

Pankaj - Joshi4-Dec-07 23:32

4-Dec-07 23:32

Thanks for your reply I already explore this error....

And now code is

string strItemNameToFound = itemlist[0].ToString().Trim();
if (Convert.ToBoolean(cmbSubItem.Items.Contains(strItemNameToFound)))

But this is still not working any help...?

Regards
Pankaj Joshi

If you want to shape your dreams into reality, please wake-up...

dan!sh 4-Dec-07 23:32

dan!sh

4-Dec-07 23:32

My fault I accept.
Then the only way I can think of is to make sure that you are using right cases."Contains" is case sensitive.

Until you realize this message has nothing to say, its too late to stop reading

mav.northwind4-Dec-07 23:34

4-Dec-07 23:34

Hi!
ComboBox.ObjectCollection.Contains() does work properly, you're not using it correctly.
My guess is that you're not adding the items as strings, so the result you get from Contains() is correct.

Take a look at that code:

foreach (string s in new string { "A", "B", "C", "D", "E", "F" })
  ComboBox1.Items.Add(s);
 
Debug.Assert(ComboBox1.Items.Contains("C")); // Doesn't show an assertion message
Debug.Assert(!ComboBox1.Items.Contains("Z")); // Doesn't show an assertion message

ComboBox1.Items.Clear();

foreach (char c in new char[] { 'A', 'B', 'C', 'D', 'E', 'F' })
  ComboBox1.Items.Add(c);
 
Debug.Assert(ComboBox1.Items.Contains("C")); // Does show an assertion message
Debug.Assert(!ComboBox1.Items.Contains("Z")); // Does show an assertion message

Regards,
mav

--
Black holes are the places where God divided by 0...

Pankaj - Joshi4-Dec-07 23:50

4-Dec-07 23:50

I agreed with you.

But I'm not adding the items same as you. I'm filling item names from database and directly assign the datatable as datasource.

And this is also not working why.....?

Regards
Pankaj Joshi

If you want to shape your dreams into reality, please wake-up...

mav.northwind5-Dec-07 0:38

5-Dec-07 0:38

There you got it: You're adding objects to the ComboBox by databinding and then ask the ComboBox if its Items collection contains a string.
What the ComboBox is showing is the result of a call to .ToString() for each object in the Items list, but the elements in the List are not the actual strings!

So, as Luc suggested, using FindString() or FindStringExact() will probably be the easiest way.

Regards,
mav

--
Black holes are the places where God divided by 0...

Pankaj - Joshi5-Dec-07 0:49

5-Dec-07 0:49

Ya I got it.

Thank you very much for your help. Rose | [Rose]

Regards
Pankaj Joshi

If you want to shape your dreams into reality, please wake-up...