FolderBrowserDialog and ThreadStateException - C# Discussion Boards

Guffa8-Oct-07 12:31

8-Oct-07 12:31

There is some vital information missing in your post.

Why do you think that there is something wrong with the code? Do you get an error message? Doesn't it do what you expect, and if so, what do you expect, and how does that differ from what you get?

---
single minded; short sighted; long gone;

Re: convert image format

cmarmr9-Oct-07 2:38

cmarmr

9-Oct-07 2:38

i get an error saying invalid parameter on the save line

Thanks,
Chad Aiena

Comparing type

lsconyer8-Oct-07 9:54

lsconyer

8-Oct-07 9:54

Can anyone tell me how to compare two objects by testing if they are the same type?

I know this doesn't work but I wish it would work like this:

private bool ActivateForm(Form form)
{

bool formIsOpen = false;
//loop through child forms to see if the form is already open
foreach (Form childForm in this.MdiChildren)
{

//if the childForm is the parameter type, activate it and break the loop
if (childForm.Type == form.Type)
{
childForm.Activate();
formIsOpen = true;
break;
}
}

return formIsOpen;
}

Lester
http://www.lestersconyers.com

Re: Comparing type

led mike8-Oct-07 10:01

led mike

8-Oct-07 10:01

lsconyer wrote:
I know this doesn't work but I wish it would work like this:

You know what I wish? I wish it would work like this:

Abbra Kadabra *waving hands*

But I guess since it doesn't I will continue to Read Documentation and study Best Practices and Software Design Patterns etc.

Re: Comparing type

Luc Pattyn8-Oct-07 10:01

Luc Pattyn

8-Oct-07 10:01

lsconyer wrote:
if (childForm.Type == form.Type)

if (childForm is Form) will succeed when childForm is a Form, which it is due
to the foreach loop.

if (childForm is Form1) will only succeed for those childForms that are also Form1,
derived from Form.

And also have a look at the "as" keyword!

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

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Re: Comparing type

Pete O'Hanlon8-Oct-07 10:11

Pete O'Hanlon

8-Oct-07 10:11

*cough* use GetType() * cough *. Could I suggest that you also look at converting this to a generic method:

private bool ActivateForm<T>(T form) where T : Form
{
  bool isOpen = false;
  int i = 0;
  do
  {
    if (MdiChildren[i].GetType() == typeof(T))
    {
      MdiChildren[i].Activate();
      isOpen = true;
    }
  } while (!isOpen && i++ < this.MdiChildren.Count);
  return isOpen
}

I you really want to learn some more advanced .NET, you could look at modifying this to use anonymous methods.

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

Re: Comparing type

Nissim Salomon8-Oct-07 10:19

Nissim Salomon

8-Oct-07 10:19

Hi
Try using the GetType() method
instead of the Type keyword in your code

FolderBrowserDialog and ThreadStateException

Saamir8-Oct-07 9:42

Saamir

8-Oct-07 9:42

Hi guys,
I am totally stuck on this one, please help!!! I just migrated my application from VS2003 to VS2005 and when I try to open a folder browser dialog box it gives me the following message:

Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it. This exception is only raised if a debugger is attached to the process.

I have tried adding the stathreadattribute, did research, etc but no luck.

PLEASE HELP!!!!!

Sameer

Re: FolderBrowserDialog and ThreadStateException

TJoe10-Oct-07 8:53

TJoe

10-Oct-07 8:53

Are you calling the FolderBrowseDialog from a different thread? Also, does your Main function look like below?

[STAThread]
static void Main() {
    Application.EnableVisualStyles();
    Application.SetCompatibleTextRenderingDefault(false);
    Application.Run(new Form1());
}

Take care,
Tom

-----------------------------------------------
Check out my blog at http://tjoe.wordpress.com

Setup

half-life8-Oct-07 8:23

half-life

8-Oct-07 8:23

HI,

Is there a way to Wrap a Project i created with setup(or installer)

thnks

kobkob

Re: Setup

Pete O'Hanlon8-Oct-07 9:48

Pete O'Hanlon

8-Oct-07 9:48

If you've got Visual Studio installed, there's an installer project present there.

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

Re: Setup

il_masacratore8-Oct-07 21:26

il_masacratore

8-Oct-07 21:26

Here you have a sample:
http://www.codeproject.com/dotnet/Win_App_Setup_Project.asp

Visit my blog at http://dotnetforeveryone.blogspot.com/

Infragistics UltraWinGrid control

umashankergr88-Oct-07 8:18

umashankergr8

8-Oct-07 8:18

Hi All,

Is there is any way , so that i can show a child row with goup of controls like a panel when the parent row is expanded in Infragistics UltraWinGrid. I know this forum is for Microsoft controls, anyway excuse me, if anyone come across this situvation please help me out..

Advance Thanks,

Umashanker.K

Re: Infragistics UltraWinGrid control

karthick.n.mca8-Oct-07 21:09

karthick.n.mca

8-Oct-07 21:09

first tell me what is infrgistics UltraWinGrid control D'Oh! | :doh:

Re: Infragistics UltraWinGrid control

umashankergr89-Oct-07 0:27

umashankergr8

9-Oct-07 0:27

Its a good tool to work on. It got various options in the grid more than the traditional Microsoft Gird control. Karthick now tell me how to achieve my task..

Check Registry for Key

andyr20058-Oct-07 7:33

andyr2005

8-Oct-07 7:33

Hi,

I am wondering is there a way to check if a specific key exists in the registry, to perform certain task if it does, and does not.

Thanks, Andrew.

Re: Check Registry for Key [modified]

Kristian Sixhøj8-Oct-07 7:41

Kristian Sixhøj

8-Oct-07 7:41

Try looking at the functions in the Microsoft.Win32.Registry class.

Virtual1ty

"Any fool can learn from his own mistakes, but a wise man learns from mistakes of others"

Re: Check Registry for Key

Guffa8-Oct-07 7:42

Guffa

8-Oct-07 7:42

Use the Registry.GetValue method to get the value. From the return value you can determine if the key existed or not.

---
single minded; short sighted; long gone;

Re: Check Registry for Key

andyr20058-Oct-07 8:00

andyr2005

8-Oct-07 8:00

Hi,

Sorry, I didn't explain myself very well, so here gooes:

RegistryKey rk = Registry.ClassesRoot.OpenSubKey("Directory\\Background\\shellex\\ContextMenuHandlers", false);<br />
string aticcc = rk.GetValue("(Default)", "Not Installed");<br />
if (aticcc == "Not Installed")<br />
ultraGroupBoxDisplayRightClickTwoChildOne.Enabled = false;

I get the following error when compiling:

Error 1 Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?) C:\Users\Andrew\Documents\Visual Studio 2005\Projects\AR Utilities\Tweak Master\frmMain.cs 137 29 Tweak Master

Thanks, Andrew.

Re: Check Registry for Key

Scott Dorman8-Oct-07 8:35

Scott Dorman

8-Oct-07 8:35

There are a few things wrong with this code that would be answered if you look at the MSDN documentation[^].

First of all, to retrieve the unnamed value (which is displayed in the registry editor as the string "(Default)", you need to use either a null reference (Nothing in Visual Basic) or the empty string ("") for name (the first parameter).

Second, the GetValue method actually returns an object, so you should cast the result to a string.

Third, registry access makes use of unmanaged resources, so you should dispose/close the keys when you are done with them.

Fourth, you should probably be doing culture aware, case insensitive string comparisons.

You're code should look something like this:

using (RegistryKey rk = Registry.ClassesRoot.OpenSubKey("Directory\\Background\\shellex\\ContextMenuHandlers", false))
{
   string aticcc = (string)rk.GetValue(String.Empty, "Not Installed");
   if (String.Compare(aticcc, "Not Installed", StringComparison.CurrentCultureIgnoreCase) == 0)
      ultraGroupBoxDisplayRightClickTwoChildOne.Enabled = false;
}

Scott.

—In just two days, tomorrow will be yesterday.

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Re: Check Registry for Key

Anthony Mushrow8-Oct-07 8:37

Anthony Mushrow

8-Oct-07 8:37

string aticcc = rk.GetValue("(Default)", "Not Installed");

Shwam a .ToString() at the end:

string aticcc = rk.GetValue("(Default)", "Not Installed").ToString();

My current favourite word is: Waffle

Cheese is still good though.

Re: Check Registry for Key

andyr20058-Oct-07 9:06

andyr2005

8-Oct-07 9:06

Hi,

Sorry, I seem to have confused things a tad here.

I'll try again. I am wanting to see if the key ACE exists under HKEY_CLASSES_ROOT\Directory\Background\shellex\ContextMenuHandlers.

If this ACE key does not exist, then I want to to something, otherwise, something else is done.

Would I have to get a array/list of Keys under HKEY_CLASSES_ROOT\Directory\Background\shellex\ContextMenuHandlers, the enumerate through them to see if any are ACE and if so, do something etc.

Any help is appreciated.

Thanks, Andrew.

Re: Check Registry for Key

Scott Dorman8-Oct-07 9:13

Scott Dorman

8-Oct-07 9:13

andyr2005 wrote:
I am wanting to see if the key ACE exists under HKEY_CLASSES_ROOT\Directory\Background\shellex\ContextMenuHandlers

Is ACE an actual key (meaning it shows up in the left tree of regedit) or is it a value under the HKEY_CLASSES_ROOT\Directory\Background\shellex\ContextMenuHandlers key (meaning it shows up in the list on the right side of regedit)?

Scott.

—In just two days, tomorrow will be yesterday.

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Re: Check Registry for Key

andyr20058-Oct-07 9:24

andyr2005

8-Oct-07 9:24

Hi,

ACE is actually a Sub Key on the left in Regedit, when a user has installed the ATI Catalyst Control Center, as discussed here[^].

Any further help is appreciated.

Thanks, Andrew.

Re: Check Registry for Key

Scott Dorman8-Oct-07 9:47

Scott Dorman

8-Oct-07 9:47

Since ACE is a subkey, you should be able to do this:

RegistryKey rk = Registry.ClassesRoot.OpenSubKey(@"Directory\Background\shellex\ContextMenuHandlers\ACE", false);

If the key doesn't exist, rk will be null.

Scott.

—In just two days, tomorrow will be yesterday.

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