Application is closing when i hide it...! - C# Discussion Boards

Math/Algebra library: parsing and proccessing functions

Maverickx895-Jun-07 5:51

5-Jun-07 5:51

I'm writing a program, where the user should be able to enter a function (for example x^2 + 4*x+3) in the interface. The function needs then to be parsed, a derrivation has to be found and the results computed by using different parameters.

Don't wanna write a parser by myself, can somebody suggest a parser/library for such things?

if freedom is outlawed, only outlaws will have freedom

Re: Math/Algebra library: parsing and proccessing functions

originSH5-Jun-07 6:08

originSH

5-Jun-07 6:08

http://www.google.co.uk/search?hl=en&q=c%23+math+parser&meta=[^]

Re: Math/Algebra library: parsing and proccessing functions

Maverickx895-Jun-07 6:36

Maverickx89

5-Jun-07 6:36

HA-HA )
I've looked on google but all what I found yet are parsers, that evaluate the function with pre-defined variable-values. If a variable is unkown and I just want to operate with the funktion, without inserting any values - they fail.

I'm sure there schould be anywhere the right one, but I'm loosing time searching for it - if someone knows any it would be nice )

Setting a variable value from an array.

jblouir5-Jun-07 5:42

jblouir

5-Jun-07 5:42

I am currently writing a text adventure in c#.

What I have is a 3 by 3 array with 0's and 1's in a specific order.

010
111
010

Basically anywhere theres a 1, thats a valid location for the person to move to.

What I need is a way to pull the value out of an array position say array[1,1]

This isnt all the code but you get the picture.

int intWall = 0;

intWall = arrWall[x,y];

if (intWall == 0)
{
Console.WriteLine("You can't move that way.");
}

// I need some way of putting the value of the x,y spot in the array to the variable

Re: Setting a variable value from an array.

Giorgi Dalakishvili5-Jun-07 5:56

Giorgi Dalakishvili

5-Jun-07 5:56

Do you need this:

arrWall[1,0]=0;<br />
arrWall[1,1]=1;

jblouir wrote:
int intWall = 0;

intWall = arrWall[x,y];

if (intWall == 0)
{
Console.WriteLine("You can't move that way.");
}

You can write just this:

if (arrWall[x,y] == 0)<br />
{<br />
Console.WriteLine("You can't move that way.");<br />
}

my articles

Re: Setting a variable value from an array.

jblouir5-Jun-07 6:21

jblouir

5-Jun-07 6:21

Odd I thought I tried that, thanks =).

I am pretty sure I tried to check the value using...

if (arrWall[x,y] == 0)
{
etc..
}

and it came back with something like cant perform on

Its working now though thanks for the help! =D

Re: Setting a variable value from an array.

Hesham Yassin6-Jun-07 8:06

Hesham Yassin

6-Jun-07 8:06

may you try to cast the value that way:

if ((int)arrWall[x,y] == 0)
{
etc...
}

i think it should work!

Application is closing when i hide it...!

Affan Toor5-Jun-07 5:37

Affan Toor

5-Jun-07 5:37

Hi!
i am facing a problem in hiding the main form. I am using notifyicon control to show the application in system tray. When user minimizes the application it hides the main form and displays the notifyicon in system tray, and on clicking the notifyicon, maximize & unhide the main form...

all this was working fine until i added a splash form at start. On load event of splash form i am performing some functions and then hide the splash form and show the main form using frmMain.ShowDialog() and after it close the application.

now when i minimize the main form it hides the form as expected but soon after hiding the form it closes the application.

after debugging it showed that when i hide the main form, it closes the form and returns to the place from where it was called (load event of splash form) and then close the splash form.

Please tell me how to handle this situation?

Thanks in advance...

Regards,
Affan Ahmad Toor

..................
QUAIDIAN FOR ONCE, QUAIDIAN FOR EVER!

Re: Application is closing when i hide it...!

blakey4045-Jun-07 5:50

blakey404

5-Jun-07 5:50

hmmmm i have a feeling this is going to be start point and/or main thread related.

seems like the splash screen you added hasnt really been added to the main form, its taken over from it and the main form is not a sub-form.

[STAThread] may be also causing you problems

sorry i cant really help any more than that, i've got a meeting to get to (lucky me)

Blush | :O

)

Re: Application is closing when i hide it...!

Luc Pattyn5-Jun-07 6:06

Luc Pattyn

5-Jun-07 6:06

Hi,

please explain, or better yet show code, for Main, splash screen and mainForm
(constructors, timers, show/hide/visible stuff).

Smile | :)

Luc Pattyn

[My Articles] [Forum Guidelines]

Re: Application is closing when i hide it...!

Affan Toor5-Jun-07 6:23

Affan Toor

5-Jun-07 6:23

Thanks for reply....here's some code of splash and main form...

Code for load event of splash form:

private void frmSplash_Load(object sender, EventArgs e)
{
// .....
// Some functions....
// .....
this.Hide();
Form objFrmMain = new frmMain();
objFrmMain.ShowDialog();
Application.Exit();
}

Code for resize event of main form:

private void frmMain_Resize(object sender, EventArgs e)
{
if (this == null)
{
return;
}

if (this.WindowState == FormWindowState.Minimized)
{
this.Hide();
notifyIcon1.Visible = true;
}
else
{
this.Show();
notifyIcon1.Visible = false;
}
}

Code for restoring the main form:

private void notifyIcon1_MouseClick(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Right)
{
ContextMenuStrip cms = new ContextMenuStrip();
cms = contextMenuStrip2;
cms.Items[0].Visible = true;
cms.Items[1].Visible = true;
}
else
{
if (this.WindowState == FormWindowState.Minimized)
{
this.Show();
notifyIcon1.Visible = true;
this.WindowState = FormWindowState.Maximized;
}

// Activate the form.
this.Activate();
this.Focus();
}
}

Following is the code in Program.cs, this may also be useful...

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

When i minimize the main form, frmMain_Resize event is executed and after this frmMain closes and the Application.Exit() is executed and application closes.

Hope this helps you understanding the ptoblem, looking forward for your reply...

Regards,
Affan Ahmad Toor

..................
QUAIDIAN FOR ONCE, QUAIDIAN FOR EVER!

Re: Application is closing when i hide it...!

Ian Shlasko5-Jun-07 7:06

Ian Shlasko

5-Jun-07 7:06

ShowDialog is the problem. It stops blocking when the form is closed OR hidden. Basically, it's the wrong method to use in this situation.

There are plenty of ways to set this up, but here's one suggestion:

<br />
static void Main()<br />
{<br />
 ...styles and such...<br />
 frmSplash splash = new frmSplash();<br />
 Application.Run(splash);<br />
 frmMain main = splash.GetMainForm();<br />
 Application.Run(main);<br />
}<br />

In frmSplash:

<br />
private frmMain _mainForm;<br />
public frmMain GetMainForm() { return _mainForm; }<br />

In frmSplash_Load (Or wherever you want to do the actual work):

<br />
_mainForm = new frmMain();<br />
...<br />
this.Hide();<br />

Basically, the sequence of events here is:

1) Main() runs an application loop on the splash form
2) Splash form, once loaded, loads the main form
3) Splash form hides itself
4) Main() continues, and grabs a reference to the main form
5) Main() closes down the Splash form (It was just hidden)
6) Main() runs an application loop on the main form

I'm sure there are many other, and better, ways to do this, but here's the first example I came up with.

ADDENDUM to clarify: The point of this, is that if your frmMain instance is called from an Application.Run() instead of a ShowDialog, the application won't exit until it actually closes, so you can hide it all you want.

Re: Application is closing when i hide it...!

Luc Pattyn5-Jun-07 7:44

Luc Pattyn

5-Jun-07 7:44

I agree.

Luc Pattyn

[My Articles] [Forum Guidelines]

Re: Application is closing when i hide it...!

Affan Toor6-Jun-07 2:03

Affan Toor

6-Jun-07 2:03

Hi!
thanks for help, it solved my problem and now my application is running perfectly...I just had to make a small change in your given code:

Ian Shlasko wrote:
In frmSplash_Load (Or wherever you want to do the actual work):

_mainForm = new frmMain();
...
this.Hide();

"this.Hide();" was not allowing the "frmMain main = splash.GetMainForm();" to execute, it was not returning control to Main(), i replaced it with "this.Close()" and now it is working fine....

Thanks again...Take Care, Cheerz,

Regards,
Affan Ahmad Toor

..................
QUAIDIAN FOR ONCE, QUAIDIAN FOR EVER!

Reagrding Xml serialization

ksrs5-Jun-07 5:10

ksrs

5-Jun-07 5:10

Hi Satips,

I did the xml serialization but i got a xml file with default xml schema.
because the class having the properties as dataset. if i use the xmlignore attribute i didn't get the default schema with xml file and also i didn't get the data.

so can u please help me how can i remove the default schema at the time of serialization.

Thanks
raja

Re: Reagrding Xml serialization

Giorgi Dalakishvili5-Jun-07 5:40

Giorgi Dalakishvili

5-Jun-07 5:40

This might help you: http://msdn2.microsoft.com/en-us/library/943242d1.aspx[^]

my articles

Re: Reagrding Xml serialization

ksrs5-Jun-07 6:45

ksrs

5-Jun-07 6:45

Hi Giorgi,

i have to serialize a class that is derived class. and it has 3 class objects and 3 dataset proerties.
actually i am using serialization technique in .net 2005,i got the xml file but it contains xml schema file also. that comes in built at the time of serialization.is there any xml attributes or nay method is there to seperate or disable the xmlschema file with xml file.

can u please help me?

Thnaks
Raja

vc++ to c# .NET

Kabirdas Jaunjare5-Jun-07 5:05

Kabirdas Jaunjare

5-Jun-07 5:05

but that would not create problem of managed and unmanaged code...?

Re: vc++ to c# .NET

originSH5-Jun-07 5:35

originSH

5-Jun-07 5:35

? has the forum put your post in the wrong place or have you just provided no information to really understand what your on about :P

Are you talking about converting VC++ code to C#?

Switching from programming in VC++ to C#?

Calling VC++ code from C#?

Newbie trying very hard not to pull my hair out!!!

allan.gagnon5-Jun-07 4:59

allan.gagnon

5-Jun-07 4:59

What I am trying to do is beable to type in to a textbox a password and then press Enter Button with that I would like to use my select statement of: "Select Count (*) As UserCount From UserName Where (Password = @Password)". This statement is in a sqldatasource and is connected to the control of the textbox on the form. I am however lost on how to continue to use the sqldatasource to tie up my enter button. I am just not sure how to use the sqldatasource in code to test for the query or even run the query. I have a example of the code I am writing if you would like to have it? I can email it to you. I would like to have to figure out some of this on my own so I dont want you to give me a complete answer right away. I want to and have to learn this!!!

Thank You
Allan

Allan F. Gagnon

Re: Newbie trying very hard not to pull my hair out!!!

kubben5-Jun-07 5:36

kubben

5-Jun-07 5:36

Is this an ASP.net app or windows app? That would make a difference in how you try to capture the enter key press. Normally you will need a login button. So your enter key press would just click the button. Then with your sqldatasource you set up a parameter that is set based off your username and password.

If you are doing asp.net, I have written an article on catching the enter key press.
http://www.codeproject.com/useritems/EnterKeyToButtonClick.asp[^]

If this is a windows app then you will want to look at the keyPress event.

Hope that helps.
Ben

how to sort an unbound column in datagridview

ChupaChupa5-Jun-07 4:57

ChupaChupa

5-Jun-07 4:57

Hello friends,

I am looked for an answer all over the net and couldnt find:
I have a datagridview (VS 2005) with VirtualMode set to true. its DataSource is a DataTable.
I have some data bound columns (not auto generated), and I add one unbound column.
I tried to sort this unbound column in without any succeed:
I tried to call the sort function of the dgv but I get an error that this is not supported. (to sort by unbound column).
I also tried to catch the dgv SortCompare event and to make the sort by myself, but i understand that this event doesnt fired in VirtualMode.

Please help me...

thanks a lot
Tomer

Chupa Chupa

Check type of object

SVb.net5-Jun-07 4:18

SVb.net

5-Jun-07 4:18

i need to know what type of object , and retrieve it from textbox.text
i mean , text = "Test" is string object
text = 123 is int object
Like
if (Textbox.Text is int?????? )
debug.write ("int")
else
debug.write ("String")

123

Re: Check type of object

Not Active5-Jun-07 4:25

Not Active

5-Jun-07 4:25

If you are obtaining the data from a textbox it will always be a string until you convert to something else.

int x;
if( int.TryParse(TextBox.Text, out x) )
debug.write("int");

only two letters away from being an asset

Re: Check type of object

Seishin#5-Jun-07 4:31

Seishin#

5-Jun-07 4:31

if you expect some type you can try converting or parsing Text property of the textbox..
example:
bool success = false;

int outVal;
success = int.TryParse(Textbox.Text, out outVal);

if(success)return outVal;

and so on with other types..

life is study!!!

Last Visit: 31-Dec-99 18:00 Last Update: 12-May-24 14:55

Refresh

ᐊ Prev 1...9213 9214 9215 921692179218 9219 9220 9221 9222 Next ᐅ

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