After I show my WinForm, it closes immediately after. I have three WinForms: my starting one, a progress bar, and then my main one. On the starting WinForm, the user clicks a button which leads them to the progress bar. Then once the progress is completed, it runs the main form through a function in another class, but then it closes immediately. It looks something like this:
//Starting WinForm
private void button1_Click(object sender, EventArgs e)
{
ProgressBarForm PBF = new ProgressBarForm();
PBF.Show();
this.Close();
}
//Progress Bar Form stuff
private void ProgressBarForm_Shown(object sender, EventArgs e)
{
// Stuff for progress bar to load
progressBar1.Maximum = 100;
if (progressBar1.Value == 100)
{
Main.ExecuteMain();
}
}
// In main class
public static void ExecuteMain()
{
MainForm MF = new MainForm();
MF.Show()
// Other stuff that leads to another function
}
And right there it closes immediately. I've tried running a separate thread for it, but it still doesn't work. I've tried keeping it in a while loop, but it constantly keeps loading and doesn't allow any interaction. Also, if this counts, I'm trying to draw on the form aswell. My question is, why does the WinForm close immediately while the other two do not?
Change PBF.Show(); to PBF.ShowDialog();
Your closing the window straight away - that's why it closes.
you need to declare
in Main class
Public MainForm MF
In other class
private void ProgressBarForm_Shown(object sender, EventArgs e)
{
// Stuff for progress bar to load
progressBar1.Maximum = 100;
if (progressBar1.Value == 100)
{
Main.MF=new Main.MainForm();
Main.MF.Show(); // open form or
// Main.MF.ShowDialog(); open modal form
}
}
The reason is that the Application.Run() call in your Main method is passed a form, and quits the message loop when that form is closed. You might want to pass your real main form to Application.Run() (create it hidden, don't show it until the progressbar completes)
Related
Hey there StackOverflow community!
So I've been working on an application that checks if the user has entered valid credentials in a Login() form, then it switches over to an Intro_Sequence() form (where a .mp4 file is played in fullscreen mode) as a sort of aesthetic addition to the app. So far so good, no problems whatsoever.
The problem comes right after the Intro ends, where supposedly the application should switch over to a third form, called Main().
I have implemented a check whenever Windows Media Player (aka axWMPLib) changes its PlayState to see whether it has finished the playback.
If it has, then the Hide() event is called to conceal the current Form's window, then main.ShowDialog() should open the third form.
Afterwards, I call the Close() event to close the previous Form's window entirely.
Here is the code so far:
public partial class Intro_Sequence : Form
{
public static string Username;
public Intro_Sequence(string username)
{
InitializeComponent();
Username = username;
FormBorderStyle = FormBorderStyle.None;
Bounds = Screen.PrimaryScreen.Bounds;
TopMost = true;
intro.uiMode = "none";
intro.URL = AppDomain.CurrentDomain.BaseDirectory + "\\Intro.mp4";
intro.enableContextMenu = false;
DisableMouseClicks();
}
private void DisableMouseClicks()
{
if (this.Filter == null)
{
this.Filter = new MouseClickMessageFilter();
Application.AddMessageFilter(this.Filter);
}
}
private MouseClickMessageFilter Filter;
private const int LButtonDown = 0x201;
private const int LButtonUp = 0x202;
private const int LButtonDoubleClick = 0x203;
public class MouseClickMessageFilter : IMessageFilter
{
public bool PreFilterMessage(ref System.Windows.Forms.Message m)
{
switch (m.Msg)
{
case LButtonDown:
case LButtonUp:
case LButtonDoubleClick:
return true;
}
return false;
}
}
private void Intro_Sequence_Load(object sender, EventArgs e)
{
}
private void intro_PlayStateChange(object sender, AxWMPLib._WMPOCXEvents_PlayStateChangeEvent e)
{
if(intro.playState == WMPLib.WMPPlayState.wmppsMediaEnded)
{
Main main = new Main(Username);
this.Hide();
main.ShowDialog();
this.Close();
}
}
}
As you can see I have also added a filter to block clicks during playback, so as not to allow the user to pause it.
However, when I execute this code, it works perfectly fine until it finishes the video and then closes abruptly.
I tried putting breakpoints and everything seems to be fine.
It does call everything I tell it to call, yet the form doesn't even appear.
I have also tried several other alternatives, like not closing the Form at all, calling Show() instead of ShowDialog() and even not Hiding it at all.
It is as if it either freezes there or closes instantly without any sign of the Main form showing.
I also tried calling the Main() form from the Login() and it works perfectly from there.
I really don't know what is going on.
Any help would be appreciated.
How about something like this?
There are three forms. There's a Login form (in this case, it's just an empty form - you close it by clicking on the red X). It is popped up modally from within the Main form (while the main form is hidden).
There's a Splash screen on which your video is to play. I fake out the video by using await Task.Delay(4000); to get a pause. After the 4 second delay, I raise an event (equivalent to your media player event). What I do is show this modally from the main form. I put the event handler in this form; when the event is raised, I close the splash screen modal. The entire (non-designer) code for that form looks like (and, since there are no controls on this form, the designer code is pretty lean):
public partial class SplashScreen : Form
{
public event EventHandler SplashFinished;
public SplashScreen()
{
InitializeComponent();
this.SplashFinished += SplashScreen_SplashFinished;
}
private async void SplashScreen_Load(object sender, EventArgs e)
{
await Task.Delay(4000);
SplashFinished?.Invoke(this, new EventArgs());
}
private void SplashScreen_SplashFinished(object sender, EventArgs e)
{
this.DialogResult = DialogResult.OK;
this.Close();
}
}
Then there's the Main form. It gets fired up in the normal way from Program.cs:
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
The only thing that I added to that form (from the out-of-the-box code) is:
private void Form1_Load(object sender, EventArgs e)
{
this.Hide();
var login = new LoginForm();
//should really check this, but for now
login.ShowDialog(this);
var splash = new SplashScreen();
splash.ShowDialog(this);
this.Show();
}
So, when the app starts, the user is shown the login form (the main form is hidden). He does what is needed to do (and the result is checked in the main form's Form1_Load handler.
If everything is cool, a new SplashScreen form is created and shown modally. When it pops up, the video starts (in this case, the video is simply an asynchronous timer). When the video ends, the SplashScreen handles the finished event, and uses it to close itself.
Once control returns to the main form, it displays itself.
Hi I'm relatively new to C# and completely new to windows form and basically trying to create a subliminal messaging program that at timed intervals will quickly display a message for it to then be hidden again.
I've managed to by looking through various other posts created another form that will pop up and then hide very quickly using
msgObject.Activate();
that brings the form to the front. However it is stopping me from being able to type when I'm working and I basically wanting to know if it is possible to make some kind of message or form appear at the front of all my other programs without it interrupting my current work or opening or closing of other windows and tasks if that makes sense. As currently it brings the form to the front of everything but will also stop me from being able to type etc.
I'm not sure if this is possible with my current method of using a form but if there is a way of achieving the result I'm after I'd be very grateful to find out
Thanks.
Here is more of my code to clarify
public partial class FormHomePage : Form
{
private bool startSubliminal = false;
msg msgObject = new msg();
List<string> subliminalMessages = new List<string>();
public FormHomePage()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void timer1_Tick(object sender, EventArgs e)
{
if (startSubliminal)
{
msgObject.Show();
msgObject.BringToFront();
msgObject.Activate();
}
}
private void button1_Click(object sender, EventArgs e)
{
subliminalMessages.Add(txtBox1.Text);
msgObject.LabelText = txtBox1.Text;
txtBox1.Text = string.Empty;
startSubliminal = true;
msgObject.Show();
msgObject.BringToFront();
}
private void timer2_Tick(object sender, EventArgs e)
{
msgObject.Hide();
}
}
How are you showing the second form (the message form) in the first place? You're probably using .Show() (right?), which will make the form "steal" the focus anyway. The same applies to .Activate() and .BringToFront().
Instead, what you can do is to show the message form and make sure it stays on top the current form, and then activate the current/main form once again.
Something like this should work:
var frm = new YourMsgForm();
frm.Show(this);
this.Activate();
Here's a demonstration:
Note that I used .Show(this) instead of .Show(), that's in order to set the current form as the Owner of the new one, that way we guarantee that the new form will stay on top of the current one. This is equivalent to calling frm.Owner = this; then frm.Show();.
Another way to make sure the form stays on top is by setting the TopMost property instead of the Owner property. However, doing so will make the new form on top of the other windows as well (not just your application).
I have 2 forms. First is a simple notepad, and i make a find function. Is works very good, but i add this.Close(); to get the resultate. If i don't close the FindForm, the action of Find button not work. I see the first form is blocked and i can't write another text. if i delete this.close() and i close FindForm after i press Find is work.
How i can open the FindForm in a new thread? i use FindForm f = new FindForm(); and f.showDialog();
If i make a Thread Th; and i use this thread to open the FindForm, my function will not work anymore. Is any method to open other form without block first form?
FindForm
public FindDialog()
{
InitializeComponent();
}
private void button_Find_Click_1(object sender, EventArgs e)
{
Form1.FindText = textBox_Text.Text;
this.Close();
}
MainForm
public void findNewToolStripMenuItem_Click(object sender, EventArgs e)
{
FindDialog gtl = new FindDialog();
gtl.Show();
richTextBox1.Select();
if (FindText != null)
{
k = richTextBox1.Find(FindText);
}
}
Calling ShowDialog will block the caller until the dialog is closed (i.e. it is modal) - if you don't want this behaviour then call Show which will open the child form modelessly (i.e. the calling code can continue)
For example, you could do something like:
public void findNewToolStripMenuItem_Click(object sender, EventArgs e)
{
FindDialog gtl = new FindDialog();
gtl.Show(); // Execution will continue immediately
richTextBox1.Select();
if (FindText != null)
{
k = richTextBox1.Find(FindText);
}
}
I'm building a GUI application with C# and gtk#. I've encountered an issue recently and was looking for the best solution to this problem:
I have a modal window that pops up for the user to enter a number. This window is a separate window accessed from my main window and it's set up like this:
public class MainWindow()
{
public NumberEntry numEntry;
Whenever I need numerical input from the user, I call ShowAll() on the public Window property of NumberEntry like:
numEntry.win.ShowAll();
And all of this works fine. Afterwards, to get the value they entered, I call:
int entered = numEntry.valueEntered;
The issue is obviously that code continues executing immediately after the ShowAll() line is finished, and numEntry.valueEntered is always 0. What I'd like to do (and have been trying to do), is to suspend the main thread, and open up the number entry window in a second thread, and join back to the main thread when this is complete. Suspending the main thread seems to prevent GUI changes making the program freeze when I try to open the number entry window. I'd also like to avoid callback methods if at all possible, seeing as how this would get rather complicated after awhile. Any advice? Thanks!
Seems like when GTK window is closed all its child controls are cleared. So to get the result from the custom dialog window you may do the following (I am not gtk guru but its works for me):
1. Create a new dialog window with your controls (I used Xamarin studio). Add result properties, OK and Cancel handlers and override OnDeleteEvent method:
public partial class MyDialog : Gtk.Dialog
{
public string Results {
get;
private set;
}
public MyDialog ()
{
this.Build ();
}
protected override bool OnDeleteEvent (Gdk.Event evnt)
{
Results = entry2.Text; // if user pressed on X button..
return base.OnDeleteEvent (evnt);
}
protected void OnButtonOkClicked (object sender, EventArgs e)
{
Results = entry2.Text;
Destroy ();
}
protected void OnButtonCancelClicked (object sender, EventArgs e)
{
Results = string.Empty;
Destroy ();
}
}
2. In your main window create a dialog object and attach to its Destroyed event your event handler:
protected void OnButtonClicked (object sender, EventArgs e)
{
var dialog = new MyDialog ();
dialog.Destroyed += HandleClose;
}
3. Get the results when dialog is closed:
void HandleClose (object sender, EventArgs e)
{
var dialog = sender as MyDialog;
var textResult = dialog.Results;
}
If you whant you also may specify a dialog result property and etс.
I've looked at all the suggested answers and nothing seems to fit what I'm looking for. I want to call a second form from my main form, hide my main form while the second form is active, and then unhide the main form when the second form closes. Basically I want to "toggle" between the two forms.
So far I have:
In my main form:
private void countClick(object sender, EventArgs e)
{
this.Hide();
subForm myNewForm = new subForm();
myNewForm.ShowDialog();
}
and in my second form I have:
private void totalClick(object sender, EventArgs e)
{
this.Close();
}
How do I get the main form to show?
ShowDialog opens your secondary Form as Modal Dialog, meaning that the MainForm's code execution will stop at that point and your secondary Form will have the focus. so all that you need to do is put a this.Show after your ShowDialog call.
From above link:
You can use this method to display a modal dialog box in your application. When this method is called, the code following it is not executed until after the dialog box is closed.
private void countClick(object sender, EventArgs e)
{
this.Hide();
subForm myNewForm = new subForm();
myNewForm.ShowDialog();
this.Show();
}
Let's say in Form1 you click a Button to show Form2
Form2 frm2 = new Form2();
frm2.Activated += new EventHandler(frm2_Activated); // Handler when the form is activated
frm2.FormClosed += new FormClosedEventHandler(frm2_FormClosed); // Hander when the form is closed
frm2.Show();
Now, this one is when the Form2 is shown or is Activated you hide the calling form, in this case the Form1
private void frm2_Activated(object sender, EventArgs e)
{
this.Hide(); // Hides Form1 but it is till in Memory
}
Then when Form2 is Closed it will Unhide Form1.
private void frm2_FormClosed(object sender, FormClosedEventArgs e)
{
this.Show(); // Unhide Form1
}
This is difficult to do correctly. The issue is that you must avoid having no window at all that can get the focus. The Windows window manager will be forced to find another window to give the focus to. That will be a window of another application. Your window will disappear behind it.
That's already the case in your existing code snippet, you are hiding your main window before showing the dialog. That usually turns out okay, except when the dialog is slow to create. It will definitely happen when the dialog is closed.
So what you need to do is hide your window after you display the dialog and show it again before the dialog closes. That requires tricks. They look like this:
private void countClick(object sender, EventArgs e)
{
this.BeginInvoke(new Action(() => this.Hide()));
using (var dlg = new subForm()) {
dlg.FormClosing += (s, fcea) => { if (!fcea.Cancel) this.Show(); };
if (dlg.ShowDialog() == DialogResult.OK) {
// etc...
}
}
}
The BeginInvoke() call is a trick to get code to run after the ShowDialog() method runs. Thus ensuring your window is hidden after the dialog window is shown. The FormClosing event of the dialog is used to get the window to be visible again just before the dialog closes.
You need to find some way to pass a reference to the main form to the second form click event handler.
You can do this either by setting the form as a member variable of the second form class or pass it via the event arguments.
If you are working in the same namespace, you have the context, using mainform or the name you gave the "main form", try:
mainform.show();