Creating controls in runtime

starcatcher · 03-26-2008, 05:14 AM

Hi,
I'm using Visual C++ and am creating a Forms Application.
How can you create a new control during runtime?
For example, how could I create a new label in my Form during runtime when the user clicks a button or something?

Thanks,
Philipp

Dino · 03-26-2008, 06:09 AM

I'm sure you can. Put the "label create" call in its own function, and call that function whenever you need a new one. It should probably return the instance of the label created. Pass any variable information as parms to the function, like text for the label, position, etc.

Todd

starcatcher · 03-26-2008, 04:40 PM

Here is what I tried:

Code:

this->label5=new Label();
this->label5->CreateControl();
this->label5->BackColor = System::Drawing::Color::Transparent;
this->label5->Location = System::Drawing::Point(400,400);
this->label5->Name = S"label5";
this->label5->Size = System::Drawing::Size(176,32);
this->label5->Text = S"This is MY label!";
this->label5->BringToFront();

I had declared label5 in the class Form1 as such:

Code:

private: System::Windows::Forms::Label *  label5;

However, I only tried that because if I declared label5 in the function itself it didn't work. (I would rather want the label to be declared in the function, I just didn't change it back). Anyway, this doesn't work either (no errors) because either the label never turns up on the Form (which I think is the case) or it hides behind my tabpages etc... (which I don't think is the case because I used 'BringToFront').

Does anyone know how to actually get the control ONTO the form (so it can be seen)?

Thanks,
Philipp

m37h0d · 03-27-2008, 07:52 AM

Quote:

Originally Posted by starcatcher

Here is what I tried:

Code:

this->label5=new Label();
this->label5->CreateControl();
this->label5->BackColor = System::Drawing::Color::Transparent;
this->label5->Location = System::Drawing::Point(400,400);
this->label5->Name = S"label5";
this->label5->Size = System::Drawing::Size(176,32);
this->label5->Text = S"This is MY label!";
this->label5->BringToFront();

I had declared label5 in the class Form1 as such:

Code:

private: System::Windows::Forms::Label *  label5;

However, I only tried that because if I declared label5 in the function itself it didn't work. (I would rather want the label to be declared in the function, I just didn't change it back). Anyway, this doesn't work either (no errors) because either the label never turns up on the Form (which I think is the case) or it hides behind my tabpages etc... (which I don't think is the case because I used 'BringToFront').

Does anyone know how to actually get the control ONTO the form (so it can be seen)?

Thanks,
Philipp

i use borland personally, and the trick there is you have to set the property "Parent". i bet there is a similar property in MSVS

starcatcher · 03-27-2008, 05:29 PM

Thank you for the replies.
After playing around a bit I worked out how to do it.
Something like:

Code:

using namespace System::Windows::Forms;
Label *MyLabel = new Label();
this::Controls::Add(Label);

Works nicely.
You can set all the other properties as well like I did when I first tried (only it would be simply 'MyLabel::...')
If I run into any more troubles (which is very likely) I will post them under this thread to avoid creating a new one.

Thanks again!

Philipp

03-26-2008, 06:09 AM	#2
Dino Jack of many languages Join Date: Nov 2007 Location: Katy, Texas Posts: 1,929	I'm sure you can. Put the "label create" call in its own function, and call that function whenever you need a new one. It should probably return the instance of the label created. Pass any variable information as parms to the function, like text for the label, position, etc. Todd __________________ Mac and Windows cross platform programmer. Ruby lover. Memorable Quotes From Recent Posts: I can't remember.
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