C# Discussion Boards - CodeProject

Rajesh R Subramanian2-Jul-09 3:07

2-Jul-09 3:07

I don't even want to know what an Mifar 1k card is, but, the card as such is such not supposed to know if you're writing text or anything else into it. So, just write the contents of the image in binary format into it.

Also, try to be more specific in the future.

It is a crappy thing, but it's life -^ Carlo Pallini

what do i have to do next

j4ck1we2-Jul-09 2:20

j4ck1we

2-Jul-09 2:20

Hi,
I need some suggestions on what should I learn
Till now I know about: arrays, lists, queue (FIFO),(LIFO), sql databases...

what should I learn next.. The problem is that I dont know how to connect my program to the internet and get information from there etc.

any tutorial on how to do this thing?

Re: what do i have to do next

dojohansen2-Jul-09 2:27

dojohansen

2-Jul-09 2:27

Try searching the articles for "webrequest" and that might get you started.

Re: what do i have to do next

musefan2-Jul-09 2:34

musefan

2-Jul-09 2:34

Actually, It would be better to look at the System.Net.WebRequest classes instead Laugh | :laugh:

Life goes very fast. Tomorrow, today is already yesterday.

Re: what do i have to do next

musefan2-Jul-09 2:30

musefan

2-Jul-09 2:30

j4ck1we wrote:
queue (FIFO),(LIFO)

I believe stack is the word you are looking for for (LIFO)

j4ck1we wrote:
what should I learn next..

It depends on what you want to do...

If you are looking at working with data across a network then there is the System.Net[^] classes that may be of interest. Thou first I would suggest taking a good look at the
System.IO[^] classes and get a good understanding of how file streams work.

Life goes very fast. Tomorrow, today is already yesterday.

Re: what do i have to do next

j4ck1we2-Jul-09 7:32

j4ck1we

2-Jul-09 7:32

Well I'm thinking of building a small app that get some info from a page (search for links in it and clicking etc.)
What things could help me do this?

IOException and Number formatting

Megidolaon2-Jul-09 1:55

Megidolaon

2-Jul-09 1:55

I'm writing a small program to help me sort my thousands of images.
But whenever I want to rename a file, I get the following error:
The process cannot access the file because it is being used by another process.

I use the following code for it

private void B_Rename_Click(object sender, EventArgs e)
        {
            L_Status.Text = "";
            File.Move(Path.GetFullPath(images[current]), Path.GetFullPath(TB_New_Name.Text));
            L_Status.Text = "image '" + images[current] + "." + extension + 
            "'\r\nhas been renamed to\r\n'" +
            TB_New_Name.Text + "." + extension + "'";
            images[current] = TB_New_Name.Text;
        }

images is the string list holding the file names, current is the current index and extension is the file extension.

My other problem is the number formatting.
The images should be named with numbers, but since windows sorting is strictly text based, 2 would come after 10.
So, I tried the string.Format method to name the images 001, 002, etc., but it doesn't quite work.

public F_Main()
        {
            InitializeComponent();
            files = Directory.GetFiles(dir);
            this.Text = string.Format("{0:00}", 1);
            this.Text += " - ";
            this.Text = string.Format("{0:00}", 12);
            this.Text += " - ";
            this.Text += string.Format("{0:00}", 120);
         }

I thought this code would display "001 - 012 - 120" in the form title, but instead it onlydisplays "12 - 120"

Thanks.

Re: IOException and Number formatting

Luc Pattyn2-Jul-09 2:02

Luc Pattyn

2-Jul-09 2:02

Hi,

1. there are a couple of ways to keep a file "in use by another process", and you should, for once, not take "another process" literally. Here are some:
- another process has opened the very same file
- for text files that other process could be an automatic indexer
- for several extensions that other process could be an antivirus checking a newly created file
- MOST LIKELY IN YOUR CASE: an image loaded with Image.FromFile() remains locked as long as the image lives.

2. numeric format "D3" would always use at least 3 characters, filling with leading zeroes.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

DISCLAIMER: this message may have been modified by others; it may no longer reflect what I intended, and may contain bad advice; use at your own risk and with extreme care.

Re: IOException and Number formatting

stancrm2-Jul-09 2:06

stancrm

2-Jul-09 2:06

Check if the "image" file you want to move is already opened from somewhere else.
The second problem is :
See this line :

this.Text = string.Format("{0:00}", 12);
it has to be
this.Text += string.Format("{0:00}", 12);

Re: IOException and Number formatting

musefan2-Jul-09 2:21

musefan

2-Jul-09 2:21

I think your missing the point of the question. I believe the OP was trying to demonstrate that the number formatting did not include the desired prefix of zeros.

Life goes very fast. Tomorrow, today is already yesterday.

Re: IOException and Number formatting

musefan2-Jul-09 2:11

musefan

2-Jul-09 2:11

The error usually occurs when you have a reference to the image still active. How are you loading the 'images' list can you show the code for that please.

with regards to the fomatting then try using the int.ToString() method...

int i = 12;
string s = i.ToString("000");//s should now = "012"

Life goes very fast. Tomorrow, today is already yesterday.

Re: IOException and Number formatting

Henry Minute2-Jul-09 2:13

Henry Minute

2-Jul-09 2:13

In addition to Luc's points, for 2.

public F_Main()
{
    InitializeComponent();
    files = Directory.GetFiles(dir);
    this.Text = string.Format("{0:D3} - {1:D3} - {2:D3}", 1, 12, 120);
}

seems neater and easier to read to me.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

Re: IOException and Number formatting

musefan2-Jul-09 2:17

musefan

2-Jul-09 2:17

Henry Minute wrote:
this.Text = string.Format("{0:D3} - {1:D3} - {2:D3}", 1, 12, 120);

Problem with that is it will only work for a fixed number of files, which anything above 1 seems like too much work for me Smile | :)

...Thou given the OP's example it would produce what he was showing. My assumption is that each file with be appended with a number that increments with each file

Life goes very fast. Tomorrow, today is already yesterday.

Re: IOException and Number formatting

Henry Minute2-Jul-09 2:20

Henry Minute

2-Jul-09 2:20

musefan wrote:
it will only work for a fixed number of files,

Whilst that is true, I was simply implementing the users own logic, in what I thought was a better way. You are absolutely correct if there were likely to be an unknown number of files.

Re: IOException and Number formatting

musefan2-Jul-09 2:23

musefan

2-Jul-09 2:23

that's why I edited my post as I can see you are just providing a solution based on the OP's example Wink | ;)

Life goes very fast. Tomorrow, today is already yesterday.

Re: IOException and Number formatting

Megidolaon2-Jul-09 11:27

Megidolaon

2-Jul-09 11:27

Thanks.
For the formatting "D3" works the way I want.

Though, the main problem is still the renaming.
I changed the code for displaying the picture to:

Bitmap picture = new Bitmap(800, 600);
picture = new Bitmap(images[0]);
PB_Image.Image = new Bitmap(picture);
picture.Dispose();
TB_Old_Name.Text = Path.GetFileNameWithoutExtension(images[0]);

And this is the code I use for renaming:

L_Status.Text = "";
File.Move(Path.GetFullPath(images[current]), Path.GetFullPath(TB_New_Name.Text));
L_Status.Text = "image '" + images[current] + "." + extension + "'\r\nhas been renamed to\r\n'"                                             
+TB_New_Name.Text + "." + extension + "'";
images[current] = TB_New_Name.Text;

But now the program simply deletes the image.
I tested it and the image that should have been renamed simply disappeared.

Mifare RFID reader with GNET Plus protocol

GerritdL2-Jul-09 1:43

GerritdL

2-Jul-09 1:43

Good day to all off the codeproject members.

is there anyone who has some sample c# code that can read from a mifare rfid reader (through a serial comm port)
It is a PCR310 RFID reader with GNET plus protocol

With kind regards
Gerrit

Re: Mifare RFID reader with GNET Plus protocol

Henry Minute2-Jul-09 2:17

Henry Minute

2-Jul-09 2:17

All of the stuff I see on this, from a quick search, says that it comes with a software module, do you not have that?

Re: Mifare RFID reader with GNET Plus protocol

GerritdL6-Jul-09 20:17

GerritdL

6-Jul-09 20:17

Thx Henry,
You were right i recieved the packadge from the dealer. after a call
Working on it now.
with regards,

Re: Mifare RFID reader with GNET Plus protocol

Muhammad Yousuf Maher16-Jul-14 3:04

Muhammad Yousuf Maher

16-Jul-14 3:04

Hi GerritdL,

Any success with the C# program. I am stuck with PCR310U and not able to get UID.

Regards,

exception trying to insert a range to an Excelsheet

Harry6662-Jul-09 1:23

Harry666

2-Jul-09 1:23

Hello there,

I am programming C# using MS Visual Studio Professional Edition 2008 and MS Office Excel 2007.
My Problem is that I want to mark a range, copy and insert it at the same position shifting existing cells down. I can do this with the Excel GUI - no problem. But programmatically I get a System.Runtime.InteropServices.COMException, telling me that the Insert-method of the Range-object could not be executed (German text:"Die Insert Methode des Range-Objektes konnte nicht ausgeführt werden.").

The range I want to copy has got some special formats (font, color, some merged cells), and I need these for each entry I have to insert.

I am trying this code
<pre>
Excel.Worksheet sheet = (Excel.Worksheet)wb.Sheets["mySheet"]; // wb is the actual workbook
Excel.Range range = sheet.get_Range(sheet.Cells[16, 1], sheet.Cells[18, 37]);// this is "A16:AK18"
range.Insert(Excel.XlInsertShiftDirection.xlShiftDown, range);
</pre>

Here come the questions:
Why can I not insert the range? What are possible reasons?
How can I insert the desired range?

Thanks in anticipation!
Harry

no plan,
no signature

Re: exception trying to insert a range to an Excelsheet

padmanabhan N2-Jul-09 1:44

padmanabhan N

2-Jul-09 1:44

Harry666 wrote:
Excel.Range range = sheet.get_Range(sheet.Cells[16, 1], sheet.Cells[18, 37]);// this is "A16:AK18"

you can directly use like this:

Excel.Range range = sheet.get_Range("A" +16, "AK" +18);// this is "A16:AK18"

Padmanabhan
My Articles:
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Re: exception trying to insert a range to an Excelsheet

Harry6662-Jul-09 5:04

Harry666

2-Jul-09 5:04

Is it good for any purpose to use the letters instead of numbers,
besides getting the range out of a string instead of the Cells[] Array?
I'm asking, because I have to count and calculate with the rows - well, not the columns... Sniff | :^)

I want to say: in both cases I use the get_Range()-method. Is there any difference in the range which I get using another param?

Harry

no plan,
no signature

Re: exception trying to insert a range to an Excelsheet

MumbleB2-Jul-09 1:47

MumbleB

2-Jul-09 1:47

I think you have to select the range first. so, before the range.Insert try and insert the following statement to selct the range that you just specified range.Select(). Hope this helps, if not let us know.

Excellence is doing ordinary things extraordinarily well.

Re: exception trying to insert a range to an Excelsheet

MumbleB2-Jul-09 1:57

MumbleB

2-Jul-09 1:57

I just tested the below code using VS2005 and it works fine.

objRange = objSheet.get_Range("A16", "AK18");
objRange.Select();
objRange.Insert(XlInsertShiftDirection.xlShiftDown, objRange);

Excellence is doing ordinary things extraordinarily well.

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