C++ Qt 05 - Displaying Windows

Lean how to display main Windows and Dialogs in Modal and Modeless methods

Category:

Education

Tags:

• QT
• 05
• Displaying
• Windows

[Reloadedrhapsody]

Great vid dude, but I'm having trouble with the code inside the new window void, when I type .setModal(true) and .exec() and then I run the program, it gives me errors saying that the class "x" has no member named setModal and exec.

Please help!

[VoidRealms]

@Reloadedrhapsody I think your window is a mainwindow, try using a QDialog instead

[Reloadedrhapsody]

@VoidRealms dude, I'm totally new to this program, is there any way I can chat with you (if you have time) so you can help me?? Please? My proyect is due friday

please? yes? :D hahaha

[VoidRealms]

@Reloadedrhapsody hehe sorry i have been uber busy with work and kid, you can always email me!

[TheBlitMaster]

I'm adding you to my recommended channels immediately.

[VoidRealms]

@TheBlitMaster  :D

[greniocracy]

as I wrote previously, good job.

[Whanhee]

@thowabu I'm a bit hazy on this part too. If QT truly does release the space once it's finished, in the example wouldn't it better to just use a local pointer instead of a member pointer?

[elvampir0]

Hi, there´s something i dont understand.

Why was it necesary to go thru the trouble of declaring a class member of type MyDialog on MainWindow (adding mDialog to mainwindow.h, etc)?

why not just create the dialog on the heap inside the OnNewWindow function? like...

MyDialog dlg = new MyDialog(this);

i think that in this situation mDialog class member is useless, since the pointer will be overwritten every time the user clicks the new window button.

[thowabu]

@BobWyaJnr :

I think I got it.

He allocate the memory for the Object.

Function "new" give back the pointer and do the C++ CTor and so on.

Every time he does it.

So evertime a New Dialog is created and "running".

But I never reach the older created Objects.

Shouldn´t a good Programmer avoid this Situation??

(Obviously QT will release the Space on exit..)

[BobWyaJnr]

@thowabu

Consider what the C++ 'new' command does - creates a new heap variable and gives you a pointer to it. Each time you create a new dialogue window object you overwrite the previous pointer reference in the 'mdialog' pointer (private class variable).

[TheMajorStudios]

Qt creator was build in Qt? That's a paradox. Aaaaaaaaaaaaaaaaaaaaaaaaaaah

[denit28s]

8:45 gives error

ISO C++ forbids declaration of 'myDialog' with no type

[cridus10]

how can I do to create and give functions to buttons if I can't use the form??

[KAHNonymousjohn]

You've earned my subscription.

[iiMPR3SSiiON]

What the fuck happened to nice and educational youtube channels? Oh, VoidRealms is there, forget what I just wrote! :D Great!