Re: Hide Taskbar from C#.net - C# Discussion Boards

jameswhollister28-Apr-05 19:54

28-Apr-05 19:54

I'm trying to overlay a form that I have created in C# over another application that is not an MDI window. I've been doing some research in the user32 dll and found how to overlay my form onto other applications such as IE that are MDIs but ran into this problem when I tried it with the one im intending to use it on. Is there a way to do this without too much trouble or will I have to just create the window without a parent and then manage the z-orders of the windows to make it appear to be a child? and if so are there events that fire that will let me know when the z-orders change and the position of the parent window changes? Thanks for the help.

Setting a control focus when form is loaded

Anonymous28-Apr-05 17:47

Anonymous

28-Apr-05 17:47

I would like to set the focus of a text box with the blinking cursor after the form is loaded. Where in the construction do I accomplish this functionality?

Re: Setting a control focus when form is loaded

rudy.net28-Apr-05 19:27

rudy.net

28-Apr-05 19:27

In FormLoad event.
Ex: textbox1.Focus();

Re: Setting a control focus when form is loaded

Anonymous29-Apr-05 5:37

Anonymous

29-Apr-05 5:37

Thank you for your help.

Re: Setting a control focus when form is loaded

Kodanda Pani28-Apr-05 19:33

Kodanda Pani

28-Apr-05 19:33

Hi,

You can use the tabindex property. Set the tabindex property of that control to 0.

Thanks and Regards
SGS

Re: Setting a control focus when form is loaded

M.Waseem Chishti28-Apr-05 20:23

M.Waseem Chishti

28-Apr-05 20:23

select the text box you want to get focus, in designer go to its properties, set "TabIndex" property to 0 and Its done Smile | :)

Hide Taskbar from C#.net

Kyaw Soe Khaing28-Apr-05 16:50

Kyaw Soe Khaing

28-Apr-05 16:50

I want to hide windowxp taskbar from C#.net.
Who can help me?

pls...

Re: Hide Taskbar from C#.net

leppie28-Apr-05 19:18

leppie

28-Apr-05 19:18

This code will help, now just read the Windows SDK docs how to use it.

[DllImport("shell32.dll")]
extern static int SHAppBarMessage(int msg, ref APPBARDATA data);

struct APPBARDATA
{
  internal int size;
  IntPtr hwnd;
  uint callback;
  internal uint edge;
  internal Rect rc;
  int lparam;
}

^{xacc-ide 0.0.15 now with C#, MSIL, C, XML, ASP.NET, Nemerle, MyXaml and HLSL coloring - Screenshots}

Re: Hide Taskbar from C#.net

Fernando Soto28-Apr-05 19:41

Fernando Soto

28-Apr-05 19:41

Hi kyawsoe;

The only way I know how to do this is by using unmanaged code. The two functions you need to call are FindWindow and SetWindowPos which are found in user32.

Here is some code to do it.
Import the two dll's [DllImport("user32.dll",EntryPoint="FindWindow",CharSet=CharSet.Unicode)]
static extern IntPtr MyFindWindow(string _WindowClassName, string _WindowName);

[DllImport ("user32.dll",EntryPoint="SetWindowPos",CharSet=CharSet.Unicode)]
static extern bool MySetWindowPos (IntPtr hWnd, Int32 hWndInsertAfter,
Int32 X, Int32 Y, Int32 cx, Int32 cy, uint uFlags);

Define some variables
private IntPtr hTaskWindow; // Handle to task window
private const uint TOGGLE_HIDEWINDOW = 0x80;
private const uint TOGGLE_UNHIDEWINDOW = 0x40;

You can place this in form load event or somewhere appropriate. It is the handle to the task bar
hTaskWindow = MyFindWindow("Shell_traywnd", "");

Now when you want to hide the task bar execute this statement
MySetWindowPos(hTaskWindow, 0, 0, 0, 0, 0, TOGGLE_HIDEWINDOW);

Or when you want to un-hide the task bar execute this statement
MySetWindowPos(hTaskWindow, 0, 0, 0, 0, 0, TOGGLE_UNHIDEWINDOW);

That's it.

I hope that is was of some help. Smile | :)

-Fernando Soto

Sending info to another frame

brian5528-Apr-05 15:44

brian55

28-Apr-05 15:44

Ok, now that I have access to my data I need to display it in another aspx page. How do I do this?

What I am trying to do is use one of my frames to display different bits of informtion depending on what the user is doing.

Re: Sending info to another frame

MoustafaS28-Apr-05 17:25

MoustafaS

28-Apr-05 17:25

You would be answerded if you ask this in the asp.net forums.

Pop-Up & AxBrowser

Sergio Luix28-Apr-05 14:09

Sergio Luix

28-Apr-05 14:09

Hello,

How can i block Pop-Ups in a AxBrowser Component? has a way to do this?

Thanks.

Re: Pop-Up & AxBrowser

leppie28-Apr-05 19:12

leppie

28-Apr-05 19:12

You have been answered already.

^{xacc-ide 0.0.15 now with C#, MSIL, C, XML, ASP.NET, Nemerle, MyXaml and HLSL coloring - Screenshots}

Re: Pop-Up & AxBrowser

Sergio Luix28-Apr-05 19:15

Sergio Luix

28-Apr-05 19:15

Nop :\

Re: Pop-Up & AxBrowser

leppie28-Apr-05 19:25

leppie

28-Apr-05 19:25

Seems my internet is against replying to you! Just happened again! D'Oh! | :doh:

Post dont go thru.

Anyways search the articles section. I know of at least 2 articles showing how to do this.

^{xacc-ide 0.0.15 now with C#, MSIL, C, XML, ASP.NET, Nemerle, MyXaml and HLSL coloring - Screenshots}

Re: Pop-Up & AxBrowser

Moon Boy28-Apr-05 19:31

Moon Boy

28-Apr-05 19:31

Man, the other topic wasn't well written nor well understood :\, so i'm still without answser!

The articles I found didn't helped me to find out how to block Pop-ups directly Frown | :(

Re: Pop-Up & AxBrowser

Moon Boy28-Apr-05 19:46

Moon Boy

28-Apr-05 19:46

Lol o.o
I got it

the answer:
NewWindow Event

private void web_NewWindow(object sender, AxSHDocVw.DWebBrowserEvents2_NewWindow2Event e)<br />
{<br />
    e.cancel = true;<br />
}

Thanks

General object destruction question:

tantiboh28-Apr-05 13:32

tantiboh

28-Apr-05 13:32

Being an intermediate programmer, I'm having a hard time understanding the documentation that is out there regarding this topic.

Let's say I have two objects, derived from ClassA and ClassB. The lifecycle of Class B is as follows:

-ClassA instantiates an instance of ClassB, and places this object into, say, a hashtable.
-ClassB does its thing for a while, but then becomes useless.
-ClassA removes ClassB from the hashtable. Now, there is no reference to that object within ClassA.

What happens to ClassB? Is it still floating out there in memory? Do I need to tell ClassA to actually destroy the ClassB object, or does the GC already know that ClassA no longer refers to ClassB, and therefore destroys it automatically?

Thanks for your help.

Re: General object destruction question:

Marc Clifton28-Apr-05 15:38

Marc Clifton

28-Apr-05 15:38

tantiboh wrote:
Is it still floating out there in memory?

Yes, for an indeterminate amount of time, until the GC puts the memory back into the general pool ("collects" it).

tantiboh wrote:
Do I need to tell ClassA to actually destroy the ClassB object

No. Not unless ClassB was using some non-managed resources.

does the GC already know that ClassA no longer refers to ClassB, and therefore destroys it automatically?

Yes.

It's hard to get ones arms around this, coming from C++. There's a lot of good articles out there. Try googling on "Understanding .NET Garbage Collection".

Marc

MyXaml
Advanced Unit Testing
YAPO

Getting a timer's remaining time?

tantiboh28-Apr-05 12:38

tantiboh

28-Apr-05 12:38

I'm using a System.Timers.Timer object. How can I get (or calculate an estimate for) the amount of time remaining on the timer? The estimate wouldn't have to be any more accurate than a few dozen milliseconds.

It's an ASP project, so System.Windows.Forms.Timer is not available.

Thanks for you help.

Re: Getting a timer's remaining time?

Marc Clifton28-Apr-05 15:51

Marc Clifton

28-Apr-05 15:51

tantiboh wrote:
How can I get (or calculate an estimate for) the amount of time remaining on the timer?

Here's an idea: derive your own timer that hooks the Elapsed event. Whenever the timer fires, do an intervalStartTicks=DateTime.Ticks or something.

Have a method in your derived class called "RemainingTime", or something like that, that gives you Interval - DateTime.Ticks - intervalStartTicks, doing the appropriate unit conversions.

You might also want to provide your own Start method that sets the intervalStartTicks as well.

Marc

MyXaml
Advanced Unit Testing
YAPO

Creating object instances by their name

Anonymous28-Apr-05 12:08

Anonymous

28-Apr-05 12:08

Hi everybody!
In Java such a piece of code

<br />
javax.swing.JFrame frame = null;<br />
try<br />
{<br />
    frame = Class.forName("javax.swing.JFrame");<br />
}<br />
catch (Exception e) {}<br />

would create a new JFrame object (of course if the string provided isn't a correct name exceptions are thrown).

Is there s similar mechanism in C#? Becouse if there is it would let me ommit many string.Equals() and is calls and make the code a whole lot easier to read.

Re: Creating object instances by their name

Andy Brummer28-Apr-05 12:29

Andy Brummer

28-Apr-05 12:29

Look at System.Activator.CreateInstance, or you can do the same if you already have a reference to an assembly.

I can imagine the sinking feeling one would have after ordering my book,
only to find a laughably ridiculous theory with demented logic once the book arrives - Mark McCutcheon

How do you program with the GAC?

kmaclean28-Apr-05 11:55

kmaclean

28-Apr-05 11:55

All Happy Now!
We have an existing ASP.NET app (C# backend) that was originally written with weakly named backend objects, distributed to our customer's via traditional "XCOPY" (actually InstallShield, but just dropping files in the right location), so that all of the necessary DLL's are installed in the /bin directory of the default website. This works fine for just one app.

Now, we are in the process of adding additional applications to our existing one, and in order to do that, we are strong-naming our components and trying to install them to the GAC, so that they can be globally referenced. I have successfully strong-named all of our components, and can put them into the GAC without issue as well. However, when I remove the /bin directory after having placed the components in the GAC, I get "Object Not Found" errors when trying to run the app.

Is there something I need to change in the way my .DLLs reference each other, so that the app will search the GAC when loading?

This is somewhat urgent as we are midway through the design process and starting to reconfigure our existing code. If our distribution plans are misinformed, we need to know now so we can lay a better path.

Thanks for any help we can get!

Re: How do you program with the GAC?

Marc Clifton28-Apr-05 16:00

Marc Clifton

28-Apr-05 16:00

This doesn't directly answer your question, but I wouldn't put assemblies into the GAC during development. This can be a real pain, because you have to specifically tell gacutil to uninstall the assembly first or force it to re-install over an existing install:

gacutil /f /i myassembly.dll

But this fails if you've installed the assembly with MSI, because it can only be uninstalled using MSI!

It's easier to add things to the GAC as part of installation and test the installation separately--NOT on the development platform. Use VirtualPC or something to ensure a clean, reproducable install environment.

Marc

MyXaml
Advanced Unit Testing
YAPO

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