Re: creating custom control that contains DialogResult - C# Discussion Boards

How to programmably release a virtual COM Port "In Use"?

Member 30175479-Feb-10 4:15

9-Feb-10 4:15

I am developing a device that uses FTDI USB driver. The FTDI USB chip creates a virtual COM port every time a new device is plugged in to the computer. e.g. COM16. Even when the device is removed, this port COM16 is still marked "In Use" in Windows Device Manager.

When my device is in production, certain computer may connects to 100s of them. I don't want to see COM200(in use). That will be a big problem for the application.

So how can I programmably (C#) make a virtual COM Port available to my device? e.g. COM10 (in use), release this COM10, so my next device can use it. I know how to force Windows Device Manager to release it manually, but I need to do this programmably by my application in C#.

Any advice will be appreciated!

Re: How to programmably release a virtual COM Port "In Use"?

slebusch3-Aug-10 5:25

slebusch

3-Aug-10 5:25

not exactly what you asked, but maybe a workaround:

on the manufacturer's websit www.ftdichip.com you will find the menu Documents/Application Notes, an on that page the "Advanced Driver Options"
AN_107

Chapter 7 describes the posibility to set registry entries to ingnore the hardware serial number. So you will get only one device installed, even if you frequently plug others of the same VID (Vendor ID) and PID (Product ID)

How to query WiFi access point for list of users connected to it ?

blood_hl9-Feb-10 3:36

blood_hl

9-Feb-10 3:36

Consider a WIFI network and we are given a random local ip eg 172.20.0.228 and i want to find out WIFI access point through which this user is connected without using anything on user side , (using a C# program).

I think two possible solutions can be -

1) Trace a path to given ip 172.20.0.228 so that the node before the given ip in the will be access point.

2) Query all acess points and get a list of users connected to them. Then we can search any given ip (eg 172.20.0.228 in this case) in those lists.

My Problem is i dont know how to implement any of these two possible solutions in c# (Windows Application) prefrebly but if its not possible in C# post something in vc++ too.

I think 2nd solution of getting list of users will be more appropriate. So suggest me something to implement this thing in c#.
How can we get list of users from an access point ?

Thanks

creating custom control that contains DialogResult [modified]

sajjad.aghapouer9-Feb-10 3:21

sajjad.aghapouer

9-Feb-10 3:21

Hi All
i have a class that inherits from the Label class.this class have to returns a DialogResult like a Button Control.but i can't create this property correctly.the following code is my class:

public class GA5_Button : System.Windows.Forms.Label
{
    [Browsable(true),
    DefaultValue(typeof(System.Windows.Forms.DialogResult))]
    public DialogResult MyDialogResult
    {
        get;
        set;
    }
}

i want to click on this Control then set the Form.DialogResult on MyDialogResult value.how can i do this?

sorry for bad english
Thanks in advance

modified on Tuesday, February 9, 2010 10:02 AM

Re: creating custom control that contains DialogResult

OriginalGriff9-Feb-10 4:38

OriginalGriff

9-Feb-10 4:38

What is the problem - it seems to work for me:

public partial class LabelClick : Label
    {
    public LabelClick()
        {
        InitializeComponent();
        }
    [Browsable(true),
    DefaultValue(typeof(System.Windows.Forms.DialogResult))]
    public DialogResult DialogResult
    { get; set; }
    private void LabelClick_Click(object sender, EventArgs e)
        {
        DialogResult = DialogResult.OK;
        }
    }

And in the form:

private void labelClick1_Click(object sender, EventArgs e)
    {
    DialogResult = labelClick1.DialogResult;
    }

Closes my form and returns DialogResult to Form.ShowDialog
What is it doing (or not doing) for you?

If Barbie is so popular, why do you have to buy her friends?

Eagles may soar, but weasels don't get sucked into jet engines.

If at first you don't succeed, destroy all evidence that you tried.

Re: creating custom control that contains DialogResult

OriginalGriff9-Feb-10 5:11

OriginalGriff

9-Feb-10 5:11

I just had a thought: I have never had any success using the DefaultValue Attribute with enum properties - the only way I have found of reliably defaulting them is to use:

private DialogResult dialogResult = DialogResult.OK;
[Browsable(true)]
public DialogResult DialogResult
   { get { return dialogResult; } set { dialogResult = value; } }

If Barbie is so popular, why do you have to buy her friends?

Eagles may soar, but weasels don't get sucked into jet engines.

If at first you don't succeed, destroy all evidence that you tried.

Re: creating custom control that contains DialogResult

sajjad.aghapouer9-Feb-10 6:43

sajjad.aghapouer

9-Feb-10 6:43

Thanks for your reply

my problem:
i don't want to set the Form.DialogResult by code,exactly like a button.
when we set a Button.DialogResult to OK or Cancel in Properties Window, Form.DialogResult adapted with it without coding.

i don't know that whether you understand my meaning or not????

Sorry for bad English

Re: creating custom control that contains DialogResult

OriginalGriff9-Feb-10 9:24

OriginalGriff

9-Feb-10 9:24

I know what you mean:

When you add a button to a form, you can set the Dialog Result in the Properties window to "OK" or "Cancel", (or "Abort", "Retry" etc.). Whe you press the button on the form, the form closes, and the Dialog result is returned to the form creator via the Form.ShowDialog method.

Unfortunately, this is specific to button, and does not work in that way for labels. They don't even have a DialogResult property! You can simulate it in code, by subscribing to the Label Click event, and setting the form DialogResult to DialogResult.OK, and that will work - but this is unusual behaviour for a Windows App, and may confuse your users. A button is more normal.

To simulate the button:
1) Create a event handler for the Label.Click event either in the properties window, or programatically in your Load event with

label1.Click += new EventHandler(label1_Click)

2) In your handler set the forms DialogResult to DialogResult.OK or DialogResult.Cancel
It will have the effect you want.

If Barbie is so popular, why do you have to buy her friends?

Eagles may soar, but weasels don't get sucked into jet engines.

If at first you don't succeed, destroy all evidence that you tried.

How to record or capture voices from speaker or sound card on my computer win7, not from microphone

serkanweb9-Feb-10 2:54

serkanweb

9-Feb-10 2:54

I want to record sound from mp3 player ,media player,ie

Re: How to record or capture voices from speaker or sound card on my computer win7, not from microphone

serkanweb9-Feb-10 23:39

serkanweb

9-Feb-10 23:39

regarding Microsoft Sync Framework

Tridip Bhattacharjee9-Feb-10 2:47

Tridip Bhattacharjee

9-Feb-10 2:47

is it possible to sycn two sql database data with Microsoft Sync Framework. if so can anyone give sample code.

thanks.

tbhattacharjee

InsertMenuItem WinAPI problem

Nematjon Rahmanov9-Feb-10 1:17

Nematjon Rahmanov

9-Feb-10 1:17

Hi !

I'm working shell context menu on 64 pc.
I rebuild app under x64 pc.

I want add menu item to windows context menu.Registery is OK and windows explorer find my dll.

But InsertMenuItem WinAPI function not working!

MENUITEMINFO mii = new MENUITEMINFO();
mii.cbSize =(uint)Marshal.SizeOf(typeof(MENUITEMINFO));// 0x30;
mii.fMask = (uint)MIIM.TYPE | (uint)MIIM.STATE |(uint)MIIM.SUBMENU;
mii.fType =(uint) MF.STRING;
mii.wID = idCmdFirst + num;
mii.dwTypeData = "My menu text";
mii.fState =(uint)MF.ENABLED;
mii.cch = (uint)mii.dwTypeData.Length;
                    
InsertMenuItem(hmenu, iMenu+1, true, ref mii);

My defenition :

[DllImport("user32.dll")]
public static extern bool InsertMenuItem(uint hMenu, uint uItem, bool fByPosition,[In] ref MENUITEMINFO lpmii);
   

   [StructLayout(LayoutKind.Sequential)]
    public struct MENUITEMINFO
    {
        public uint cbSize;
        public uint fMask;
        public uint fType;
        public uint fState;
        public int wID;
        public int hSubMenu;
        public int hbmpChecked;
        public int hbmpUnchecked;
        public int dwItemData;
        public String dwTypeData;
        public uint cch;
        public int hbmpItem;
    }

Please help me. (I know writing shell menu under .net is not good,but i very want see it).

Thanks.

We are haven't bug,just temporarily undecided problems.

Re: InsertMenuItem WinAPI problem

Luc Pattyn9-Feb-10 1:25

Luc Pattyn

9-Feb-10 1:25

In Win64 all pointers take 64 bits, hence uint hMenu is wrong in public static extern bool InsertMenuItem(uint hMenu, uint uItem, bool fByPosition,[In] ref MENUITEMINFO lpmii);.

One should always use IntPtr when passing a handle or pointer; and yes, www.pinvoke.net has some errors in that regard.

Another potential problem may be the string in your structure; not sure that gets marshaled automatically.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly formatted, adding PRE tags is the easiest way to obtain that.
All Toronto weekends should be extremely wet until we get it automated in regular forums, not just QA.

Re: InsertMenuItem WinAPI problem

Nematjon Rahmanov9-Feb-10 1:47

Nematjon Rahmanov

9-Feb-10 1:47

Hi Luc.
Thanks for your reply.

I change my code like that :

[DllImport("user32.dll")]
        public static extern bool InsertMenuItem(IntPtr hMenu, uint uItem, bool fByPosition,[In] ref MENUITEMINFO lpmii);

        [DllImport("user32.dll")]
        public static extern int SetMenuItemBitmaps(IntPtr hmenu, uint uposition, uint uFlags, IntPtr hBitmapUnchecked, IntPtr hBitmapChecked);

InsertMenuItem not yet working , but SetMenuItemBitmaps working well.

Please help me .
Thanks .

We are haven't bug,just temporarily undecided problems.

Re: InsertMenuItem WinAPI problem

Covean9-Feb-10 2:08

Covean

9-Feb-10 2:08

1. You have used the flag MIIM.SUBMENU (fMask) but you hasn't set the hSubMenu value.
2. You also should adjust your struct to use IntPtr instead of int.

Like this:

[StructLayout(LayoutKind.Sequential)]
public struct MENUITEMINFO
{
    public uint cbSize;
    public uint fMask;
    public uint fType;
    public uint fState;
    public int wID;
    public IntPtr hSubMenu;
    public IntPtr hbmpChecked;
    public IntPtr hbmpUnchecked;
    public IntPtr dwItemData;
    public String dwTypeData;
    public uint cch;
    public IntPtr hbmpItem;
}

There may be also the problem with the (LPTSTR)String dwTypeData. If it doesn't work you could try StringBuilder instead.

Greetings
Covean

Re: InsertMenuItem WinAPI problem

Nematjon Rahmanov9-Feb-10 2:33

Nematjon Rahmanov

9-Feb-10 2:33

Thanks Covean.
You are right .Problem is fixed.

Now i have shell menu working both 32 bit and 64 bit Windows version!

Thank you very much! Rose | [Rose]

We are haven't bug,just temporarily undecided problems.

Re: InsertMenuItem WinAPI problem

Covean9-Feb-10 2:49

Covean

9-Feb-10 2:49

You're welcome! Big Grin | :-D

Greetings
Covean

Re: InsertMenuItem WinAPI problem

Decco28-Feb-10 23:27

Decco

28-Feb-10 23:27

Thanks, I had exactly the same problem !
Here my new code, if it can help someone esle Smile | :)

[StructLayout(LayoutKind.Sequential)]
public struct MENUITEMINFO
{
    public uint cbSize;
    public uint fMask;
    public uint fType;
    public uint fState;
    public uint wID;
    public IntPtr hSubMenu;
    public IntPtr hbmpChecked;
    public IntPtr hbmpUnchecked;
    public IntPtr dwItemData;
    public string dwTypeData;
    public uint cch;
    public IntPtr hbmpItem;
}

public class DllImports
{
[DllImport("user32.dll")]
    public static extern bool InsertMenuItem(IntPtr hMenu, uint uPosition, uint uFlags, [In] ref MENUITEMINFO mii);

    [DllImport("user32")]
    public static extern UInt32 SetMenuItemBitmaps(IntPtr hMenu, uint uPosition, uint uFlags, IntPtr hBitmapUnchecked, IntPtr hBitmapChecked);
}

private void AddMenuItem(IntPtr hMenu, uint id, uint position, string text, Bitmap icon, IntPtr? hSubMenu)
{
    MENUITEMINFO mii = new MENUITEMINFO();
    mii.cbSize = (uint)Marshal.SizeOf(typeof(MENUITEMINFO)); //48;
    mii.fMask = (uint)MIIM.ID | (uint)MIIM.STRING | (uint)MIIM.SUBMENU;
    mii.wID = id;
    mii.dwTypeData = text;

    if (hSubMenu.HasValue)
    {
        mii.hSubMenu = hSubMenu.Value;
    }

    DllImports.InsertMenuItem(hMenu, position, (uint)MF.BYPOSITION, ref mii);

    if (icon != null)
    {
        DllImports.SetMenuItemBitmaps(hMenu, id, (uint)MF.BYCOMMAND, icon.GetHbitmap(), icon.GetHbitmap());
    }
}

The biggest problem was this line :

mii.cbSize = (uint)Marshal.SizeOf(typeof(MENUITEMINFO)); //48;

As in all exemples you found on web, the size is set to 48 by default and not calculate.

Thanks again.
Decco

Sorting

sachees1238-Feb-10 23:59

sachees123

8-Feb-10 23:59

Dear Frnds,

I have got reg nos and marks. Now im supposed to allot rank.

What i tried : LIST<T>, SORTEDLIST, HASHTABLE, AND ARRAYLIST.

from the above, sortedlist works but it sorts the key ie. reg nos and not the marks.

help required.

Re: Sorting

monstale9-Feb-10 0:38

monstale

9-Feb-10 0:38

Hi,

did you try .Sort() after writing and before reading the collection?
Pls send code if it doesn't help

bye

Re: Sorting

ThatsAlok9-Feb-10 0:57

ThatsAlok

9-Feb-10 0:57

monstale wrote:
did you try .Sort() after writing and before reading the collection?

.Sort will sort on key not on value, he need to change design of it application or do manually sorting!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
Support CRY- Child Relief and You

Re: Sorting

ThatsAlok9-Feb-10 0:41

ThatsAlok

9-Feb-10 0:41

sachees123 wrote:
from the above, sortedlist works but it sorts the key ie. reg nos and not the marks.

it is because your key is registration no not marks. Also you can't have marks as key as there chance you are getting same marks twice or thrice or so on!

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
Support CRY- Child Relief and You

Re: Sorting

Luc Pattyn9-Feb-10 1:01

Luc Pattyn

9-Feb-10 1:01

read all about it[^].

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

Re: Sorting

Dan Mos9-Feb-10 9:09

Dan Mos

9-Feb-10 9:09

A List<T> where T implements IComparable<T> is the best one because it has flexibility in that
you can provide custom IComparer(s) when calling the .Sort()method.

Sure a Dictionary<key,value> is faster but just like the SortedList you can only sort/search based on the key.

how to retrive max value of a column by using c#

inayat basha8-Feb-10 23:54

inayat basha

8-Feb-10 23:54

Hi All,

I am using a query i.e."select max(empcode) as code from demotable"
it was giving a value in sqlserver,but i want to implement it in c#.net by using the code. can any one help me plz...

Regards,
Basha.

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