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I have a dialog form which is currently showing. I would like to temporarily make it invisible. If I either call Hide(), or send a message to it to hide, then it returns a DialogResult. I'd like it to stay in the dialog loop - I'm going to make it visible again later.
Anybody have any advice?
Best wishes
James
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Hi,
You may try using timer control and an integer/long type FLAG to achieve this instead of putting it in a loop. Below is the code snippet for the same. The below mentioned code consists of two forms Form1 (which is a main form) and a Dialog form (Dialog1)
-------------------------------------------------------------------------
BEGIN CODE
Public Class Form1
Dim FLAG As Integer = 0 ‘ Declaring a FLAG of integer Type
Dim frm As New Dialog1 ‘ Creatign an object of Dialog Form
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
‘ Setting the timer interval to 10 seconds.
Me.Timer1.Interval = 10000
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Me.Timer1.Start()
frm.ShowDialog()
End Sub
Private Sub Timer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Timer1.Tick
If FLAG < 32500 Then
If FLAG Mod 2 = 0 Then
frm.Hide() '
FLAG += 1
Else
frm.Show()
FLAG += 1
End If
End If
End Sub
End Class
END CODE
-------------------------------------------------------------------------
I hope this helps.
Have a nice day  .
Regards,
John Adams
ComponentOne LLC
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Hi,
AFAIK you can't do that. Forms shown with ShowDialog() will be hidden, not closed,
when a button or the close box is hit, so they can be reused later on.
Conversely, hiding a dialog corresponds to hitting the close box, hence returns
a DialogResult.
Rationale: a dialog is top-most, what good would it be to show the underlying form
but have it disabled (as dialogs do). Or more general, what is the use of an
invisible top-most window?
Luc Pattyn [Forum Guidelines] [My Articles]
This month's tips:
- before you ask a question here, search CodeProject, then Google;
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get;
- use PRE tags to preserve formatting when showing multi-line code snippets.
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Hi Luc
I think you are right - that is the intention. Just for my application I'm trying to avoid this from happening.
You've asked why it would be of use - this, of course - stretches back to my application locking requirement which I am still working on.
With the windows forms source code released this morning I've been doing quite a bit of exploration. This is an excellent resource, and much better than reflector. I can't find exactly where the trigger that returns the DialogResult when the window when it is hidden (either with an external ShowWindow call, or with .net Hide/Show) - if I could I'd be able to see if there was any way to "work around" this behaviour.
Best wishes
James
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hi all,
I have problem.in window application i am using datagrid veiw control.in this control cursor is moving to down cell when we press "enter key "(keyboard) .but i want to move to next cell(beside) of current cell when we press enter key buttone.how can we do this .
please help me
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Hi,
The behavior you have noticed is the default behavior of the grid. In order to implement the desired behavior you need to sub class the
DataGridView controls and override/overload ProcessDialogKey and ProcessDataGridViewKey functions. Below is the code snippet for the same.
-------------------------------------------------------------------------
BEGIN CODE
Public Class dgv
Inherits DataGridView
Protected Overloads Overrides Function ProcessDialogKey(ByVal keyData As Keys) As Boolean
Dim key As Keys = (keyData And Keys.KeyCode)
If key = Keys.Enter Then
Return Me.ProcessRightKey(keyData)
End If
Return MyBase.ProcessDialogKey(keyData)
End Function
Protected Overloads Overrides Function ProcessDataGridViewKey(ByVal e As KeyEventArgs) As Boolean
If e.KeyCode = Keys.Enter Then
Return Me.ProcessRightKey(e.KeyData)
End If
Return MyBase.ProcessDataGridViewKey(e)
End Function
End Class
END CODE
-------------------------------------------------------------------------
For more details please visit the following link:
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=157055&SiteID=1[^]
I hope this helps .
Regards,
John Adams
ComponentOne LLC
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Thank you sir for sending solution.but i am using c# in my windows application.in that i have taken datagridview control in form9 and where i can declare this class(your code) .how can we access that class please send clearly sir.i have been trying to solve this problem.
thank you sir.
Regards
Obalesu
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thank you jhon for your code .it is working.but cursor does not gone to next row first cell when the cursor is in last cell of the currentrow when we press enter key.and i am facing another problem is i was trying to check the data entered by us in datagridview to database table.means datagridview first column name "x".i want check the x values to database table values if the data is already exist in database table at that time i want to show an error msg in message box.after that the cursor must be in the error cell.but the cursor moves to next cell.if error occurs the cursor must be in the error cell only.if u have any idea send me.
thank you sir.
regards
Obalesu.nagamalli
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I'm trying to build a USB hub driver whose behavior is like windows' built in one.
My implementation is based on the ddk's example: toaster. Mass storage devices and scanners
works fine on my driver, however usb cameras can't be started.
I analysed the irps when the camera is plugined. After the start device irp, the driver received
a remove device irp. The ddk document says if anyone in the driver stack failed in start device irp,
pnp manager will send a remove device irp. I think there must be something wrong in the implementation before the remove device irp is sent.
There is a query interface irp which query TRANSLATOR_INTERFACE before the remove device irp is sent and I return STATUS_NO_SUPPORTED.
My response to start device irp is just like the toaster example does.
My question is:
1. Do I have to implement the TRANSLATOR_INTERFACE to fix the problem?
2. Or is there something else I have to do in my start device response?
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CodeGuru has a hardware driver forum. You would probably get an answer over there.
Hardware-level development if a much different animal from standard application development.
Hope this helps you get an answer.
Michael
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Hi,
This is from chandrakanth.
I have created SSIS package. And I want to Call from Asp.net 2.0
Can any one tell me how to call that.
Thanks In Advance
chandrakanth
Chandrakanth
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And this relates to Windows Forms, how?
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Application Wide Central Hotkey Filter based on Win 32 API Hooks
I have written a central hotkey manger prototype (see describtion below the question) for a complex MDI Application (child windows / subwindows are loaded via COM and other technologies). A simple Win 32 API hook (e.g. WH_KEYBOARD_LL) based filter (written in C# but that does not matter - could also be C/C++) replaces a lot of keyboard event forwarding code in an applications sub windows written in many different languages (as they are plug-ins etc.) and you no longer have to deal with different keyboard event management concepts in the different UI Frameworks used.
But I have two problems (the cases A and B below) as I am not a Win32 API Expert.
----------
QUESTION
I would be grateful for any ideas about how the states/cases below can be determined !easily! via Win32 API, without having to change the code of the sub windows.
A) "covered by a modal sub window"
I have to know (without changing the code of the modal dialog) when in the context of the main window (to that hotkeys are forwarded) a modal child window / dialog is opened (and closed), because the hotkey filter shall not filter any keyboard events (event when hotkeys) in the context of modal dialogs.
B) active parent window
You can think of cases, when there are several “main windows” ("main" means: windows that receive hotkeys and can have child windows)
that receive application wide hotkeys (but each main window belongs to a different sub tree in the window hierarchy), all main windows distinguished by their win32 API handles. The handles of the main windows are known to the hotkey manager, but not the sub windows.
Main Window A --child--> SubWindow2 … --child--> SubWindowFocus
Main Window B --child--> SubWindow3
When “SubWindowFocus” has the Focus each keyboard event reaches the same Hotkey Manager via the keyboard hook, the hotkey manager only knows (handles) A and B.
Is it possible to determine the appropriate Main Window (A would be correct) via Win32 API? In that context the event was raised.
-----
PROTOTYPE – Application Hotkey Filter
I am actually developing a “hotkey manager” that works in a complex environment (i.e. the main system and main windows are written in smalltalk or c++ and there are lots sub windows (i.e. plug-ins and add-ons) implemented in Java, .NET, VisualBasic …
Regarding the forwarding of not consumed keyboard events from the sub windows to the main windows there are many bugs and problems (some framework related or COM related) in order to get rid of all these problems I have written a central hotkey manager (filter) that attaches itself to each relevant event dispatching thread of the application.
The manager uses a Win 32 API keyboard hook (a local hook) that filters all keyboard events before the reach the sub windows, the filter than redirects hotkeys directly to the main window instead of relaying on the sub windows to forward them. Non-hotkeys go the normal way.
My code is actually quite ugly (prototype) so it makes no sense to post it (i will write a hotkey filter article when finished) - if you are interested in this topic see the codeproject article (this a global hook, i used a local one) on that my solution idea is based:
http://www.codeproject.com/KB/system/CSLLKeyboard.aspx
Best regards,
Martin Schwienbacher
modified on Tuesday, January 15, 2008 4:59:15 AM
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Hello all,
I am pretty much excited to get registered to this site because its totally different from other programming sites...I saw codes and demos of some windows application.It was mind blowing to see the UI and the code usage...
I am new to c#...In the sense,i have developed some simple applications like user authenticatoin,insertion,updation,deletion,search,etc...
Those things can be done in any language...I really like working with c# and want to dive in deep...So far i know about the basic controls and simple codes....I need help from u peopele like what are the basic things and how to develop application like a professional..I have some books on c# but those books just brushes the basics of all the controls..I want to develop my programming skills and good practices on how to code and design.
So suggest me some pretty good books on developing Gui application in c#..
Thanks and Regards
Bharathi..
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You can start with "C# Step by Step " by Microsoft Press.
Good luck !!!
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One suggestion is to study Design Patterns in C#. It may take you a year to get up to the level of completely understanding everything the book presents, but you will keep it by your side the entire time you use C#.
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How to remotely connect multiple PCs(Windows OS based) computers from a single Mac and display all of them on Mac Leopard Spaces !!
can somebody give me a good suggestion on this,
Thanks You ,
Nickle
Happy Programming!
Regards,
Nikhil Pagidala
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Nikhil,
You kind of went backwards in your approach to getting information. Instead of coming to a C#, Windows development forum, you should go to a MAC forum and ask there. Your code has to be written and consumed within the MAC.
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I have a grid control with a number of properties, including colCount, rowCount and rowFooterFillType.
When I change them in designer, they get written into <class>.designer.cs in alphabetic order.
The initialization happens in this order:
newGrid.colCount = 8;<br />
newGrid.rowCount = 4;<br />
newGrid.rowFooterFillType = Type.typeOf("System.Windows.Forms.Label");
What happens is that the grid is created, it is sized, and then it finds out that each of the columns was supposed to create a footer of type "Label".
It makes more sense for the code to be initialized like so:
newGrid.rowFooterFillType = Type.typeOf("System.Windows.Forms.Label");<br />
newGrid.colCount = 8;<br />
newGrid.rowCount = 4;
That way, when the rows are created, they already know what type of footer to use, and create them like I want.
I can go in and change the order of the code designer put out, but that does no good the next time I change one of the attributes in designer, since designer puts them back into alpha order.
Anyone got any good ideas?
Thanks
I want to die like my Grandfather.
Peaceful, Sleeping.
Not screaming like his passengers.
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I suggest you don't attempt to control the order the properties are called in. In fact, this is a violation of the FxCop (.NET rules) specification - properties are supposed to be black box so that it doesn't MATTER what order you set them in.
That said, it is obviously unrealistic to expect properties to not affect each other. This is why the designer supports the BeginInit() and EndInit() methods from the ISupportInitialize interface. The designer will automatically insert BeginInit() before it sets any of your properties, and will call EndInit() when they're done.
What you can do with this is when BeginInit is set, set a flag in your code to true, and as long as it is true, simply update your backing field for the properties. Don't do any processing on them.
When EndInit() is called, unset your flag, and execute all of the code that should be executed to make all of your properties take effect.
All you need to do to support this behavior is add " : ISupportInitialize" to your class declaration and implement the appropriate methods.
Read more about it here[^]
It has become appallingly obvious that our technology has exceeded our humanity. - Albert Einstein
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THANK YOU!
I know it is not the best behavior, but I am setting default types for the grid cells, and I sort of need to know what they are BEFORE I create the cells, since the user might change the default for new cells, without wanting to re-initialize the old cells.
ISupportInitialize looks like it will be just the trick.
I want to die like my Grandfather.
Peaceful, Sleeping.
Not screaming like his passengers.
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RichardM1 wrote: I know it is not the best behavior, but I am setting default types for the grid cells, and I sort of need to know what they are BEFORE I create the cells, since the user might change the default for new cells, without wanting to re-initialize the old cells.
Nah, it sounds fine. Sometimes this is the simplest approach, even if it seems like it's not elegant enough. I've learned that if it takes 32 hours to come up with an elegant solution, when a less-elegant-but-equally-workable-solution will do, implementing the elegant solution is a waste of time.
ISupportInitialize is pretty cool  I don't use it often, but when I do need it I'm damn glad it's there..
It has become appallingly obvious that our technology has exceeded our humanity. - Albert Einstein
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LOL!
It is like a hammer:
Sometimes a jeweler's screw driver just will not make the TV work, so you have to use the hammer.
I want to die like my Grandfather.
Peaceful, Sleeping.
Not screaming like his passengers.
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I need help with following problem:
I created new project with two Windows Forms called Form1 and Form2. Now, I put on each Form one Button and one Text Box.
The main Form is Form1 which I start the program. When I click Button1, Form2 shows and into Textbox1 in Form2 it puts some text. To do this in Form1 I added code:
#include "Form2.h"
...
private: Form2^ form2;
...
private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e)
{
form2 = gcnew Form2();
form2->textBox1->Text="sometext";
form2->Show();
}
Everything works fine, but..... Now I want do the same in opposite direction. I want to click on Button1 on Form2 and put some text into textbox1 on Form1. How to do this????
I cannot add in Form2 #include "Form1.h" because it will not compile(There are some errors)
Please help me with this "simple" problem.
Best regards
Szymon
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First, you really need to break the habit of a Form directly modifying another Form. Comming from a C++ world, you should already know about OOP and encapsulation. What you're doing is breaking the rules of encapsulation for sure because a Form (class actually) needs to know about the internals of another class. You're explicitly tying those two classes together to the point where one cannot exist without the other. Does that sound like good encapsulation to you??
Get into the habit of creating a data model first, completely independent of a user interface. I know it's a bit overkill for such a simple example as what you're doing now, but the experience comes in very handy when your projects become larger and larger, and when you need to run the same app as both a Windows Forms app and as a Web Forms app.
For your case, a class that exposes a property that hold the "message" being passed between forms would work just fine. This property would fire an event that either (or both) forms can subscribe to so that if either form, at any time, set the property (call it "Message"), both forms (or even more) would get notified of the change and be able to update their own UI components themselves. Neither form has to know anything about the other.
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