Creating dynamic controls on a form - C# Discussion Boards

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Re: UserControls

densher14-May-09 7:19

densher

14-May-09 7:19

Basically, the control would target applications using VS 2005 and up including .Net as the development platform. I simply wish to enable the coder to draw the control on their form and interact as we did with the old OCX.

Densher

Re: UserControls

Eddy Vluggen14-May-09 8:15

Eddy Vluggen

14-May-09 8:15

The user can right-click on the toolbox and add a reference to your assembly by selecting the DLL. You can register the assembly using regasm if you want it to show up in the list of possible .NET references.

I are troll Smile | :)

Re: UserControls

densher14-May-09 8:35

densher

14-May-09 8:35

I believe you have mis-understood or I have mis-stated my need. I actually get the DLL to register with RegAsm. When I try to draw it on a form I get the error 80040154, CLSID not properly registered. Regasm reported completion successfully. From what I have been able to glean from the MSDN, I need some assembly statements for Interop and Enterprise Services and and possibly an interface. I need to know the structure of those code statements. Thanks for your time on this issue.

Densher

Send a struct to external DLL

Ronenb14-May-09 5:47

Ronenb

14-May-09 5:47

Hi All
I have a project in C# that I need to import C++ dll
In order to import it I’m using
[DllImport("CommunicationManagerDLL.dll")]
private static extern bool WiMAXGetState(ref eNDIS_802_16E_STATE NDIS_802_16E_STATE);

how can I send a pointer to struct to the dll ?
should I use ref?

Thanks
Ronen

Re: Send a struct to external DLL

DaveyM6914-May-09 7:32

DaveyM69

14-May-09 7:32

This should work if you're struct is correct.

eNDIS_802_16E_STATE NDIS_802_16E_STATE interopStruct = new eNDIS_802_16E_STATE NDIS_802_16E_STATE();
bool result = WiMAXGetState(ref interopStruct);

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)

Re: Send a struct to external DLL

Luc Pattyn14-May-09 8:17

Luc Pattyn

14-May-09 8:17

That looks fine for simple structs, holding value types only, except maybe for padding and different semantics (long and char). And it could go terribly wrong when the struct holds reference types or pointers.

Smile | :)

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Re: Send a struct to external DLL

DaveyM6914-May-09 8:32

DaveyM69

14-May-09 8:32

Of course, with no info on the struct it's impossible to be absolutly sure!

Creating dynamic controls on a form

fracalifa14-May-09 5:09

fracalifa

14-May-09 5:09

Hi all,

I want to create controls dynamicly on a form with the properties comming from a DataTable. (see code below)
The Table contains the infos like "name", "typ", "location", "size", ... of each control to create.

...
adapter.SelectCommand.CommandText = "SELECT * FROM controls WHERE controls_ID = 123";		
adapter.SelectCommand.Connection = conn;
adapter.SelectCommand.CommandTimeout = 60;
				
DS = new DataSet();
adapter.Fill(DS,"Ctrl");
System.Windows.Forms.Control[] X=null;

Table = DS.Tables["Ctrl"];
if(Table.Rows.Count>0)
{
   this.SuspendLayout();
   for(int i=0; i<Table.Rows.Count; i++)
   {
	DataRow row = Table.Rows[i];
	Type typ = Type.GetType(row["typ"].ToString());   // can be TextBox, Label, 
	typ X[i] = new typ();      // <-----here is the problem ------ how to assign/create the typ of control ? 
	X[i].Text = row["text"].ToString();
	X[i].Name = row["name"].ToString();
	this.Controls.Add(X[i]);
   }
   this.ResumeLayout();
}
...

how can I assign or create the right type of control. (see the marked row)
Is there an other way to do that ?

Thank you for your help
frank

Re: Creating dynamic controls on a form

Luc Pattyn14-May-09 5:24

Luc Pattyn

14-May-09 5:24

Hi,

there are at least two ways to do it:

1.
for a limited number of types, provide specific code for each type, maybe inside a switch statement; simple but not really elegant.

2.
use reflection, have a look at Activator.CreateInstance()

Smile | :)

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Re: Creating dynamic controls on a form

fracalifa14-May-09 7:47

fracalifa

14-May-09 7:47

Hi Luc,

tnx for your answer.
Your first way you have mentioned is a way I can follow for that task but, for the future the second solution might be more interesting.

Do you have a link to an example for the second way ?

txn in advance
frank

Re: Creating dynamic controls on a form

Luc Pattyn14-May-09 8:18

Luc Pattyn

14-May-09 8:18

No but google will have plenty.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

The quality and detail of your question reflects on the effectiveness of the help you are likely to get.
Show formatted code inside PRE tags, and give clear symptoms when describing a problem.

[Message Deleted]

Ankit Aneja14-May-09 5:07

Ankit Aneja

14-May-09 5:07

[Message Deleted]

Re: datatype

EliottA14-May-09 5:46

EliottA

14-May-09 5:46

Not C#, fail.

Check out the CodeProject forum Guidelines[^]

Re: datatype

Ankit Aneja14-May-09 5:48

Ankit Aneja

14-May-09 5:48

Deleted and postedin VB forum

Ankit Aneja
"Nothing is impossible. The word itself says - I M possible"

Shape Control

yogeshcprajapati@hotmail.com Yogesh14-May-09 3:47

yogeshcprajapati@hotmail.com Yogesh

14-May-09 3:47

Hello everyone.. I am new to C#.net. I have got a project similar to MS Word Shape. Where we can add a shape(such as rectangle or circle) and then move it or edit its properties or even delete it. The shape is a control which has 8 little squares (on corners and sides) by which we can resize it.(As i said just like MS Word2007 Shape.) Now I have already made the control move and resize.But i am facing problem with the KeyDown event of the controls. i need it to delete and move the control with the help of keyboard keys. i have already got the Control's Sizechanged, KeyPress and MouseDown events working properly. but only the KeyDown event does'nt work. it seems like this event is never called when any key is pressed.

Yogesh Prajapati

Re: Shape Control

Samer Aburabie14-May-09 3:50

Samer Aburabie

14-May-09 3:50

I think this link should help you from Microsoft MSDN:
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.keydown(VS.71).aspx[^]

Sincerely Samer Abu Rabie

Imagination is more important than knowledge !

Re: Shape Control

yogeshcprajapati@hotmail.com Yogesh14-May-09 6:40

yogeshcprajapati@hotmail.com Yogesh

14-May-09 6:40

Hi Sameer, thanks for your reply.. I have already tried this long back.. but no use.. i cannot delete my control on pressing Del key.

Yogesh Prajapati

Regular Expresion

ONeil Tomlinson14-May-09 3:46

ONeil Tomlinson

14-May-09 3:46

Hi
I want to write a regular expression that will match when there is no "XXSP" at the begining of the string

eg "XXSPPaabbcc1234" = No Match
eg "XaXSPPaabbcc1234" = Match

Thanks

Re: Regular Expresion

OriginalGriff14-May-09 3:54

OriginalGriff

14-May-09 3:54

Why use a regular expression?

if ((s.Length >= 5) && (!s.StartsWith("XXSP")
   {
   //Match
   }

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Re: Regular Expresion

ONeil Tomlinson14-May-09 4:05

ONeil Tomlinson

14-May-09 4:05

I need to use a Regular expression (im passing it to a Business rule engine)

Re: Regular Expresion

OriginalGriff14-May-09 4:44

OriginalGriff

14-May-09 4:44

Isn't it just "^XXSP" as in:

string s1 = "XXSPHello";
string s2 = "XaSPGoodbye";
Regex r = new Regex(@"^XXSP");
if (r.Match(s1).Success)
    {
    MessageBox.Show(s1);
    }
if (r.Match(s2).Success)
    {
    MessageBox.Show(s2);
    }

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Re: Regular Expresion

MidwestLimey14-May-09 4:47

MidwestLimey

14-May-09 4:47

That will match any string starting with XXSP.

10110011001111101010101000001000001101001010001010100000100000101000001000111100010110001011001011

Re: Regular Expresion

MidwestLimey14-May-09 4:47

MidwestLimey

14-May-09 4:47

You can't use a Regex to not find a pattern, per se, as there are too many ways to not match. Instead you want to match and exclude anything that begins with XXSP.
This should do the trick:

^((X[^X])|(XX[^S])|(XXS[^P])).*$

10110011001111101010101000001000001101001010001010100000100000101000001000111100010110001011001011

Re: Regular Expresion

ONeil Tomlinson14-May-09 4:54

ONeil Tomlinson

14-May-09 4:54

Thanks dude that worked Wink | ;)

Problem to save usercontrol as .bmp image

Seraph_summer14-May-09 3:40

Seraph_summer

14-May-09 3:40

I try to use DrawtoImage() to save a usercontrol as a .bmp file,
it fails and only part of the control is displayed and others are just empty.

what is the reason and how to solve this problem?

thanks.

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