Hex String - C# Discussion Boards

Re: How to empty a Text file?

5-Apr-07 12:57

Hi, if no program has the file open you can create (=open for writing) a file with
the same name and close it without writing anything to it, hence replacing the
original with an empty file. You could use the StreamWriter class (with append=false)
and Dispose() the object immediately (i.e. without calling Write/WriteLine).

Smile | :)

Luc Pattyn

[My Articles]

Rudolf Jan6-Apr-07 0:32

Rudolf Jan

6-Apr-07 0:32

You can opent the file for write and use the truncate mode, to make it empty (I think this is default behaviour)

open OR run File

TAREQ F ABUZUHRI5-Apr-07 12:28

TAREQ F ABUZUHRI

5-Apr-07 12:28

i want to open Wold file by click button on my application
what the command will help me to do that ???

Palestine

Re: open OR run File

Luc Pattyn5-Apr-07 12:37

5-Apr-07 12:37

Hi, all files that, when double clicked in Windows Explorer, cause their
default application to open them, can be opened with that same program programatically
by using Process.Start(document_filename);

Smile | :)

Luc Pattyn

[My Articles]

Hex String

AAKAra5-Apr-07 11:37

5-Apr-07 11:37

Hello,

I need to send selected items from the ListBox to the database field "keyrings" of datatype varbinary(128),
thelogic i used is to get the selected items from the Listbox and set the byte[] to 1 for the sected item,

//Keyrings
byte[] aGroup = new byte[1024];
string hexString;
for (int index = 0; index < SecurityGroups.Items.Count; index++)
{
if (SecurityGroups.Items[index].Selected)
aGroup[index] = 1;
}

I converted those byte[] to hexstring

hexString = ToString(aGroup);

and then send the value to the database

xmlelem = xmldoc.CreateElement("", "ATTRIBUTE", "");
atttribute = xmldoc.CreateAttribute("NAME");
atttribute.Value = "KeyRings";
xmlelem.SetAttributeNode(atttribute);
xmltext = xmldoc.CreateTextNode(hexString);
xmlelem.AppendChild(xmltext);
xmlelem4.AppendChild(xmlelem);

public static string ToString(byte[] bytes)
{

string hexString = "";
try
{
StringBuilder temp = new StringBuilder();
for (int i = 0; i < bytes.Length; i++)
{
temp.Append(bytes[i].ToString("X2"));
}
hexString = temp.ToString();
}
catch (Exception)
{
}
return hexString;
}

My aGroup array shows first 3 items selected as {1,1,1,0.0.0.0...,

I am having a problem in conversion from bytes to hexstring here...with the first 3 item selected in the listbox, i should get
0700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
instead i am getting 01010100000000000000....

Is there any problem with my conversion, Please suggest.

Luc Pattyn5-Apr-07 12:44

5-Apr-07 12:44

Hi,

you did a binary string (only 0 and 1 can be present), not a hex string.
And it was too long.

You may try something along these lines:

int count=SecurityGroups.Items.Count;
byte[] aGroup = new byte[(count+7)/8]; // exact number of bytes needed in hex string
for (int index = 0; index < count; index++) {
    if (SecurityGroups.Items[index].Selected)
        aGroup[index/8] |= 1<<(index%8); // OR one of the numbers 1,2,4,8,16,32,64,128
}

if all items were selected, this would or 1 to aGroup[0], then 2 to aGroup[0], then 4,
etc.; then 1 to aGroup[1] and so on, as you probably want.

Smile | :)

Luc Pattyn

[My Articles]

AAKAra6-Apr-07 3:52

6-Apr-07 3:52

Thanks Luc,

but when i run this piece of code.,
i am getting this error
Error 1 Cannot implicitly convert type 'int' to 'byte'. An explicit conversion exists (are you missing a cast?)
Is there a way to overcome?

Luc Pattyn6-Apr-07 4:11

6-Apr-07 4:11

Sure, this should fix it:

aGroup[index/8] |= (byte)(1<<(index%8)); // OR one of the numbers 1,2,4,8,16,...

Luc Pattyn

[My Articles]

AAKAra6-Apr-07 11:39

how to code a administrator login page using C#.net and ASP.net 1.1

6-Apr-07 11:39

Again i am runing into problems.,
I am having difficulties in filling the byte array from the selected items in the listbox,

byte[] aGroup = new byte[1024];
string strKeyRingResXML = "";
string strSecurity = "<security>" + key + "";
string strKeyRingReqXML = "<iacdevrequest>" + strSecurity +
"<requestoperations><dump><options><onlinemode><object id="\""" +
="" stridhi="" +="" "."="" stridlo="" "\"="">";

strKeyRingResXML = ACDev.ProcessRequest(strKeyRingReqXML);

xmlDoc.LoadXml(strKeyRingResXML);

string strAttributesPath = "IACDEVRESPONSE/RESPONSEOPERATIONS/DUMP/OBJECT/ATTRIBUTE[@NAME='KeyRings']";
XmlNode keyringNode = xmlDoc.SelectSingleNode(strAttributesPath);
string keyring = keyringNode.InnerText;
aGroup = GetBytes(keyring);
aGroup contains 100 groups
Here comes the trouble,

I have a list box which filters for the unassignable groups(50-100) for this particular server but my database contains 1000 groups so that the user can see the other 50 or even 100 groups in someother sever.
I need to make changes to the byte array for only those items(from the 50 say i select 5 groups and deselect 2 groups),

for (int index = 0; index < count; index++)

{

if (SecurityGroups.Items[index].Selected)

I need to get the value set for that particular index in the byte array
i tried doing a
aGroup[SecurityGroups.Items[index].Value] = 1;
else
aGroup[SecurityGroups.Items[index].Value] = 0;
but this does not work

}

Can someone please suggest how to go about?

PDF Generation Tool

RB@Emphasys5-Apr-07 10:33

RB@Emphasys

5-Apr-07 10:33

Hello All,

I have a pdf document that I need to dynamically fill out per peron. It's just a simple 100 entry form that I want to beable to populate and save to pdf from my app. I've done a little searching around and I've seen some various tools and libraries for doing this kind of stuff. I was curious if anyone had any suggestions for a library that I could include in my app that makes it easy to populate existing pdfs with information.

Thanks for the suggestions in advance,
Ryan

handle to process

likefood5-Apr-07 8:16

likefood

5-Apr-07 8:16

I did a brief search of CP articles and didn't see anything...
Is it possible to get the handle to a differet process/program running? I want to try to make a program that changes programs' opacity, and I thought I'd start by trying to use the two lines:

Form f = Form.FromHandle([some app's handle]);
f.Opacity = 0.5;

I know it looks too easy to work right, and I know it sounds weird, but I want to try it anyway.

-Daniel
Typing too fast fro my owngood

Re: handle to process

pbraun5-Apr-07 8:55

pbraun

5-Apr-07 8:55

In your help files look up "Process". You can get a list of running processes that way. And if you already know the name of the process you can also get a list of only those processes with the specified name. From there you can get the process handle and so on.

Phil

Re: handle to process

likefood5-Apr-07 13:22

likefood

5-Apr-07 13:22

Awesome, thanks!

-Daniel
Typing too fast fro my owngood

sudhanshuk3ito515-Apr-07 6:07

sudhanshuk3ito51

5-Apr-07 6:07

how to code a administrator login page using C#.net and ASP.net 1.1

Re: how to code a administrator login page using C#.net and ASP.net 1.1

Sathesh Sakthivel5-Apr-07 6:42

Sathesh Sakthivel

5-Apr-07 6:42

Hey have a Look at this article, this will help you
Get It[^]

Regards,

Satips.

Re: how to code a administrator login page using C#.net and ASP.net 1.1

Not Active5-Apr-07 7:08

Not Active

5-Apr-07 7:08

Same way you would code a user login page.

only two letters away from being an asset

ListBox

AAKAra5-Apr-07 5:51

5-Apr-07 5:51

Hello,

I have a listbox, i need to make multiple selection and save those selectionindex to an array,

meaning if i select 3 and the 5th item from the listbox, i should have my array with the 3rd and 5th element 1, rest zero's can someone help me please to get the selection and copy it to the array?

Re: ListBox

kubben5-Apr-07 5:58

kubben

5-Apr-07 5:58

If you are using .net 2.0 there is a new method called GetSelectedIndices which returns an array of int of the indexes.

public virtual int[] GetSelectedIndices ()

If you are using .net 1.1 you will need to loop through the indexes in your listbox and call listbox.GetSelected(index) passing in your index. If the method returns true the item is selected.

Hope that helps.
Ben

Re: ListBox

AAKAra5-Apr-07 11:36