C# Discussion Boards - CodeProject

How to make one column of ListView invisable?

Khoramdin30-Mar-07 10:43

30-Mar-07 10:43

Hello everyone,

I have a ListView contorl which has 4 columns. I was wondering if it is possible to make one column invisiable to the user?

Thank you very much and have a nice day.

Khoramdin

Re: How to make one column of ListView invisable?

led mike30-Mar-07 12:01

led mike

30-Mar-07 12:01

Did you try setting it's width to 0 (Zero)?

led mike

Re: How to make one column of ListView invisable?

Khoramdin30-Mar-07 19:32

Khoramdin

30-Mar-07 19:32

Hello Mike,

I can set it to zero but if I am not mistaken user can open it. Unless I am missing a point here!

Thank you for your help.

Khoramdin

Re: How to make one column of ListView invisable?

led mike2-Apr-07 4:27

led mike

2-Apr-07 4:27

Ok but if you don't want the user to see it, why have it there at all? Confused | :confused:

led mike

Streamreader and read file

Saamir30-Mar-07 10:35

Saamir

30-Mar-07 10:35

Hi guys,
Need some help please
I have a file on our webserver a .dat file that has a HTTP:// path. I am trying to open,read and write to the file from a C# windows application.
Is this possible? Please advice how to go about this.

Thanks in advance.

sasa

Re: Streamreader and read file

Dave Kreskowiak30-Mar-07 11:53

Dave Kreskowiak

30-Mar-07 11:53

You can read it by downloading the file using HttpWebRequest, but that's about it. HTTP servers usually don't let you write anything back or open files for streamed read/write. Think about the gynormous security problem that introduces.

Dave Kreskowiak
Microsoft MVP - Visual Basic

Re: Streamreader and read file

Saamir30-Mar-07 12:00

Saamir

30-Mar-07 12:00

Thank you Dave for your suggestion. I used the webclient class and it worked. I am reading it, I wish I could write to it though.
Thank you for your suggestion again.

sasa

Re: Streamreader and read file

Vasudevan Deepak Kumar31-Mar-07 4:30

Vasudevan Deepak Kumar

31-Mar-07 4:30

StreamReader would take physical path. You can use HttpWebRequest and use the Stream in Response to manage the file.

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

Trouble calling COM Object Method from C# object

Brent Lamborn30-Mar-07 9:10

Brent Lamborn

30-Mar-07 9:10

Here is the code I'm having trouble with:

Type oBB = Type.GetTypeFromProgID("MyNamespace.MyClass");
Object o = Activator.CreateInstance(oBB);

//Call BuildBook
Object oResult = oBB.InvokeMember("BuildBook", System.Reflection.BindingFlags.InvokeMethod, null, o, new object[]
{ (int)Job.JobID, @"\\folder\in\" + Job.FinalFile.ToString(), Convert.ToBoolean(Job.Contribidx) });


//Get the name of the type of object returned by BuildBook and its cName property
Type oRes = oResult.GetType();
String sName = (String)oRes.InvokeMember("cName", BindingFlags.GetProperty, null, o, null);

The problem is that when I check sName, it gives me the cName property of MyClass rather than the cName property of the object returned by BuildBook. Does anyone see any obvious mistakes in my code?

"Half this game is ninety percent mental." - Yogi Berra

If you can read thank a teacher, if you can read in English, thank a Marine.

Re: Trouble calling COM Object Method from C# object

Phillip M. Hoff31-Mar-07 16:05

Phillip M. Hoff

31-Mar-07 16:05

Shouldn't the statement:

String sName = (String)oRes.InvokeMember("cName", BindingFlags.GetProperty, null, o, null);

be

String sName = (String)oRes.InvokeMember("cName", BindingFlags.GetProperty, null, oResult, null);

-Phil

Re: Trouble calling COM Object Method from C# object

Brent Lamborn2-Apr-07 3:44

Brent Lamborn

2-Apr-07 3:44

You da man Phil...you da man!

"Half this game is ninety percent mental." - Yogi Berra

If you can read thank a teacher, if you can read in English, thank a Marine.

How do I exit the program from the main form's constructor

dino209430-Mar-07 9:03

dino2094

30-Mar-07 9:03

In the constructor of my main form, I do some checking.
If it doesn't pass the check, I give a MessageBox then I
want to quit the program. As I have the code now, I get
an ObjectDisposeException. What is the proper way to
quit the program?

public Form1()
{
InitializeComponents();

if(.......){
....
....
this.Close();
}
}

Re: How do I exit the program from the main form's constructor

Leslie Sanford30-Mar-07 9:07

Leslie Sanford

30-Mar-07 9:07

dino2094 wrote:
In the constructor of my main form, I do some checking.
If it doesn't pass the check, I give a MessageBox then I
want to quit the program. As I have the code now, I get
an ObjectDisposeException. What is the proper way to
quit the program?

Override OnLoad, and do the checking there. I had the same problem and it took me awhile to figure it out.

Re: How do I exit the program from the main form's constructor

dino209430-Mar-07 9:09

dino2094

30-Mar-07 9:09

It worked! THanks

Re: How do I exit the program from the main form's constructor

Thomas Stockwell1-Apr-07 4:37

Thomas Stockwell

1-Apr-07 4:37

If it is for the main form would it be better to have the exit program logic in the void main() method of the program rather than of the form.

Regards,
Thomas Stockwell

Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.

Visit my homepage Oracle Studios[^]

verify user can access a file

minmanmax30-Mar-07 8:43

minmanmax

30-Mar-07 8:43

I have two lists. One is a list of NT user accounts. The other is a list of files on a share.
In C# I need to run a test that proves that each user has access to each file.
Note: I don’t have the account passwords.

minmanmax

Re: verify user can access a file

Ed.Poore30-Mar-07 9:09

Ed.Poore

30-Mar-07 9:09

Check out the System.Security namespace.

Re: verify user can access a file

minmanmax30-Mar-07 10:17

minmanmax

30-Mar-07 10:17

Nope. System.Security is for adding/revoking permissions on objects. It also can be used to iterate thru and objects ACLs. And of course, lots of other cool things. I have found nothing in there that will solve my problem

Re: verify user can access a file

Ed.Poore30-Mar-07 12:24

Ed.Poore

30-Mar-07 12:24

I thought that there was a collection of classes for checking user permissions on files and directories? In fact I've used them myself for checking (albeit the current) user's permissions on files.

Perhaps it's not in the System.Security namespace.

Re: verify user can access a file

minmanmax30-Mar-07 12:52

minmanmax

30-Mar-07 12:52

You are correct, Ed. The key word here is current. If I had the passwords, I could do this using the System.Security namespace by running the checking method under the users credentials.

If you can figure out how this can be done with out the password, I will throw you a parade around my desk. Smile | :)

Re: verify user can access a file

Ed.Poore30-Mar-07 23:19

Ed.Poore

30-Mar-07 23:19

I'm just browsing through documentation here and from what I remember so sorry if I'm completely wrong.

If you create an instance of FileSecurity or DirectorySecurity with the location you want to check, this just requires the path. Since both are derived from FileSystemSecurity they have methods to retrieve AccessRules and AuditRules. Both these functions require a IdentityReference which is the base class of NTAccount which to create an instance requires a username and optionally a domain name so you don't need a password.

Re: verify user can access a file

minmanmax2-Apr-07 8:51

minmanmax

2-Apr-07 8:51

Thanks Ed for looking at this. below is a samle that works with FileSecurity. It will list all the FileSystemAccessRules for a file. What I cant seem to figure out is how to show the results for a user that is a memeber of a group and that group has permission.

public static void ViewFileRights()
{
// Get security information from a file.
string file = @"c:\temp\FOO.TXT";

FileSecurity fileSec = File.GetAccessControl(file);

ShowFileSecurityInfo(fileSec);
Console.Read();
}
public static void ShowFileSecurityInfo(FileSecurity fileSec)
{
foreach (FileSystemAccessRule ace in
fileSec.GetAccessRules(true, true, typeof(NTAccount)))
{
Console.WriteLine("\tIdentityReference.Value: {0}", ace.IdentityReference.Value);
Console.WriteLine("\tAccessControlType: {0}", ace.AccessControlType);
Console.WriteLine("\tFileSystemRights: {0}", ace.FileSystemRights);
Console.WriteLine("\tInheritanceFlags: {0}", ace.InheritanceFlags);
Console.WriteLine("\tIsInherited: {0}", ace.IsInherited);
Console.WriteLine("\tPropagationFlags: {0}", ace.PropagationFlags);
//Console.WriteLine("\tfoobar.Value: {0}", ace.IdentityReference.CompareTo();

Console.WriteLine("GetAccessRules-----------------\r\n\r\n");
}
}

Re: verify user can access a file

Vasudevan Deepak Kumar31-Mar-07 4:29

Vasudevan Deepak Kumar

31-Mar-07 4:29

http://msdn2.microsoft.com/en-us/library/system.io.file.getaccesscontrol.aspx[^]

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

Get n Set

umashankergr830-Mar-07 8:34

umashankergr8

30-Mar-07 8:34

Can anyone teach me on Get and Set property in a class, and how these variables in get n set are used by other class members

Thx

Re: Get n Set [modified]

J$30-Mar-07 8:40

30-Mar-07 8:40

Get and Set are used in properties. So for instance, if you have a class with a Name property, you can delcare that as follows:

<br />
// Private member variable<br />
private string msName;<br />
// Property that exposes the private member variable msName<br />
public string Name<br />
{<br />
  get { return msName; }<br />
  set { msName = value; }<br />
}<br />

You use the Get to access the private member variable, and the Set to assign to the private member variable.

If you have an instance of your class you can use it as follows:

<br />
myObject.Name = "your name here";<br />
MessageBox.Show(myObject.Name);<br />

-- modified at 14:50 Friday 30th March, 2007

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.