C# Discussion Boards - CodeProject

Re: Beginner Question C# Form1 resizing

MoustafaS4-Jun-05 4:29

MoustafaS

4-Jun-05 4:29

Try this :

//set this property to true in the initComponent or whatever.
this.ResizeRedraw = true;
override void Form1_Paint(object sender, Forms.PaintEventArgs e)
{
   e.Graphics.DrawLine(Pens.Black,new rectangle());
}
//And you may add this to asure.
void Form_Resize()
{
   this.Invalidate();
}

set a cursor to the center

Sasuko3-Jun-05 14:24

Sasuko

3-Jun-05 14:24

i've changed in my application the standard cursor with my own.
the trouble came when i load it infact it is showed with 0,0 on the top left area of the arrow.
I want set that zone as the central of my own cursor, how can i do?

Re: set a cursor to the center

Anonymous3-Jun-05 15:24

Anonymous

3-Jun-05 15:24

If you are referring to the HotSpot in the cursor, cursor editing programs let you specify where this is. VisualStudio.NET's editor I believe offers the feature as well (try right-clicking? - i'm not in front of my system at the moment).

Re: Socket.BeginAccept woes...

Valdair6-Jun-05 4:07

Valdair

6-Jun-05 4:07

What exactly are you doing? Calling Socket.Close() cancels all pending Asynchronous events on that socket. Which should include all BeginAccept's that you have called.

WM_CopyData help

savage_3-Jun-05 12:29

savage_

3-Jun-05 12:29

hey all

i have a c++ dll which was developed by someone else and in his documents it says

typedef int (_stdcall *pConnect) (void);
this function uses a trhead to send a connect message to the controller. a reply is sent via a WM_COPYPDATA message and then the thread is destroyed.

some more notes:

WM_COPYDATA, COPYDATASTRUCT record types
the message parameter of the WM_COPYDATA function is a standard windows message structure.
the LParam field of this structure should be cast as a pointer to a standard windows COPYDATASTRUCT.

The COPYDATASTRUCT fields are used as follows:
dwData (DWORD) used to represent the record type defined below
cbData (DWORD) used to represent record size
lpData (PVOID) used to point to the data
...

i can use PInvoke to use his functions but how do i set WM_COPYDATA, COPYDATASTRUCT in c# so i can get a reply from the controller?

any suggestions?

thanks

Kids don't try this at home!

PostMessage() vs. SendMessage()

jinzhecheng3-Jun-05 12:23

jinzhecheng

3-Jun-05 12:23

Hi , C# fellows,

I have one dll and one windows form,
this dll send messages to windows form. the windows form has a message filter;
my problem is : when I use PostMessage() in dll, the message Filter can trap it; however, if I use sendMessage() , then doesnt work.

Can anyone explain Why???
WTF | :WTF:

Re: PostMessage() vs. SendMessage()

S. Senthil Kumar3-Jun-05 21:02

S. Senthil Kumar

3-Jun-05 21:02

Can you post the code for the message filter? PostMessage and SendMessage messages go to different queues, maybe the message filter is coded incorrectly?

Regards
Senthil
_____________________________
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Re: PostMessage() vs. SendMessage()

jinzhecheng7-Jun-05 2:45

jinzhecheng

7-Jun-05 2:45

OK,here is the source code::

// in the main function , do the following

MyMessageFilter msgFilter = new MyMessageFilter();
System.Windows.Forms.Application.AddMessageFilter(msgFilter);

// filter implementation
public class MyMessageFilter : System.Windows.Forms.IMessageFilter
{
public bool PreFilterMessage(ref System.Windows.Forms.Message m)
{
//custom message is 0x0800,...
if (m.Msg == 0x8000)
{ System.Windows.Forms.MessageBox.Show("Data ming" + m.Msg);
}
return false;
}
}

// and in dll , two way of send message
...
case 0x8000: PostMessage(...);break;
case 0x0801: SendMessage(...);break;

the problem is only the message by PostMessage can be trapped in the filter.
is that strange????

Re: PostMessage() vs. SendMessage()

S. Senthil Kumar7-Jun-05 3:07

S. Senthil Kumar

7-Jun-05 3:07

Does the DLL function that executes PostMessage/SendMessage run on the UI thread that is running the message pump for the HWND to which you send/post messages?

For eg, if your DLL function gets executed when the user clicks a button (on the HWND that you are sending/posting messages), then SendMessage will directly call the WndProc and won't go through the message pump. Which also means that the message filter won't work.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: PostMessage() vs. SendMessage()

jinzhecheng7-Jun-05 3:57

jinzhecheng

7-Jun-05 3:57

the Dll is in another thread,
its really confusing...

how see at the same time two active forms?

Sasuko3-Jun-05 11:47

Sasuko

3-Jun-05 11:47

I know it is impossible to set for two forms at the same time the state of active, but it is possible set for both (or more) the title bar in "active state" (just the aspect).
I know it is possible overrinding some Windows message in WndProc.
Can you tell me how?
Please it is very important.
Thanks.

Re: how see at the same time two active forms?

S. Senthil Kumar3-Jun-05 21:05

S. Senthil Kumar

3-Jun-05 21:05

Active in what sense? If you mean you need the user to be able to switch between the two forms , it is possible with modeless forms. Just call Show instead of ShowDialog.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: how see at the same time two active forms?

Sasuko3-Jun-05 22:52

Sasuko

3-Jun-05 22:52

You are absoultley out way.
I mean photoshop's like GUI. its toolbar is a child form that remain like active at the same time of the main...
I need to override some winows message, but none know what?

Re: how see at the same time two active forms?

S. Senthil Kumar3-Jun-05 23:24

S. Senthil Kumar

3-Jun-05 23:24

Oh, you mean MDI style applications? That's fairly easy, you don't need to override WndProc for that. All you need to do is set the main form's IsMdiContainer property to true and set the MdiParent property of child windows (toolbox, in your example) as the main form itself.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: how see at the same time two active forms?

Anonymous4-Jun-05 1:15

Anonymous

4-Jun-05 1:15

i don't want a mdi application just a free child form

Re: how see at the same time two active forms?

Dave Kreskowiak4-Jun-05 4:00

Dave Kreskowiak

4-Jun-05 4:00

He want's the title bars of both forms to show active at the same time. In WindowsXP default, both title bars would be blue instead of one being blue and the other form fading to light blue. He's asked this question a few times now.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

multiple interfaces

_ra3-Jun-05 10:21

_ra

3-Jun-05 10:21

I have two interfaces on the server side.
they are implemented such as:
<code>
public class IndexServerObject : MarshalByRefObject, ISend
{.....}

public class PeerClientObject : MarshalByRefObject, IPeer
{....}
</code>
however when I try to call them from my client only the second executes...why???? the PeerClientObject works, but not the first one...do I need to have multiple channels?

my client app is doing this:

<code> RemotingConfiguration.Configure "PeerCLientForIndexServer.exe.config");

IndexServerApp.IndexServerObject indexServer = new IndexServerApp.IndexServerObject();

IndexServerApp.PeerClientObject peerClient = new IndexServerApp.PeerClientObject();
</code>

this is the config file for the server:
</code>
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.runtime.remoting>
<application name="IndexServer">
<service>
<wellknown mode="Singleton"type="IndexServerApp.IndexServerObject, IndexServerObject" objectUri="IndexServer" />
</service>
<channels>
<channel port="9000" ref="tcp">
<clientProviders>
<formatter ref="binary" />
</clientProviders>
<serverProviders>
<formatter ref="binary" typeFilterLevel="Full" />
</serverProviders>
</channel>
</channels>
<lifetime leaseTime="1M" renewOnCallTime="2M" />
</application>
</system.runtime.remoting>
</configuration>
</code>

and the client side:
<code>
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.runtime.remoting>
<application name="PeerClientForIndexServer">
<channels>
<channel ref="tcp" port="0"/>
</channels>
<client>
<wellknown type="IndexServerApp.IndexServerObject, IndexServerObject" url="tcp://localhost:9000/IndexServer" />
</client>
</application>
<code></system.runtime.remoting>
</configuration></code>
</code>

_ra

Re: multiple interfaces

S. Senthil Kumar3-Jun-05 21:11

S. Senthil Kumar

3-Jun-05 21:11

What exception are you getting?

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

listing components in inherited forms

Jenesepas3-Jun-05 9:45

Jenesepas

3-Jun-05 9:45

Hi everyone

I have a base form, which have some code in its _Load event, which tries basically to get all the components in the inherited form, took the ones which are Entities ( a component developed by us) and change some properties in the control.

The is working, but only for the component in the base form Sigh | :sigh:

Even I can get the inherited form in my event in my base class, and I can see the components collection variable, I can't use it directly, because I must done a cast to the inherited class, and if I do so, it does not work for other classes...

I've research a little, and know that by reflection I can do what I want, but I would like an easier way....

I tried to use the Site form's property, as it is the one that is used in desig time, but it didn't work....

Some suggestions?
I'm really afraid of using Reflection...

Thanks
BG

Re: listing components in inherited forms

Marc Clifton3-Jun-05 11:37

Marc Clifton

3-Jun-05 11:37

Reflection is easy, but slow. Can you specify an interface for the classes you need to access, so that you can use get/set methods defined in the interface that are common to all the classes you need to work with?

Marc

My website

Latest Articles:
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Memento Design Pattern

Re: listing components in inherited forms

Jenesepas3-Jun-05 12:01

Jenesepas

3-Jun-05 12:01

Thanks Marc

I don't think I can do that. I am using (yes, I have to use reflection) reflection because the variable I need to use is form1.components (or form2.. or frmXXXX.. ), which is created by the NET designer when an user drops a component, so I ask for that name (the designer sets it , so I do not think it coult change, at least in this release Wink | ;)

)

Type otp = form.GetType();
FieldInfo ofi = otp.GetField("components", BindingFlags.Instance | BindingFlags.NonPublic);
IContainer ocomps = (IContainer)ofi.GetValue(form);

the code itself is pretty simple and understable, and I get in ocomps the components in my inherited form which I needed, but I still not liking reflection...

and I can't use an interface, because that will force the developer to assign the internal variable created by the designer to some property, and worst, if someone forgets to do , my code will not work....

This way, the developer only have to inherit from my base form, and nothing more Smile | :)