wxtextctrl clear, stuck on how to structure

**mikeyp** · 01-16-2011

Hi there, I've made a program for myself that takes wxtextctrl fields, arranges them and prints them out using a dot matrix printer, however I need to create a button that on click clears the fields, and I can't figure out how to structure the command. I'm fairly sure I need to use wxtextctrl::clear but can't for the life of me remember how to structure it.

Code:

void FormFrame::OnClearButtonClick(wxCommandEvent& event)
{
    [need to clear a field called varname (ID_VARNAME)]
}

Thank you for your help in advance.

**anon** · 01-16-2011

If you mean that you don't already have a pointer to the textctrl in question, you should be able to ask the parent of FormFrame (wxWindow) to find it for you using FindWindow or one of the functions below.

Since you want functionality not all wxWidows have, you'll have to downcast the result into a pointer to wxTextCtrl (using dynamic_cast or static_cast, if you are sure/bold).

Code:

wxWindow* text_field = this->FindWindow(ID_VARNAME);
if (text_field && dynamic_cast<wxTextCtrl*>(text_field) {
    static_cast<wxTextCtrl*>(text_field)->Clear();
}

(E.g using dynamic_cast to check if the found window is actually a text control, and then a static_cast because I am already sure it is.)

**mikeyp** · 01-17-2011

hmm, thanks for helping me with this, a lot more complicated than I thought it should be. I had to add another bracket to the second line to make it accept it, but now I'm getting the following:

obj\Release\FormMain.o:Confidence_Order_FormMain.c pp:(.text+0x41d4)||undefined reference to `FormFrame::OnvarchargeText1(wxCommandEvent&)'|
obj\Release\FormMain.o:Confidence_Order_FormMain.c pp:(.text+0x9f74)||undefined reference to `FormFrame::OnvarchargeText1(wxCommandEvent&)'|
||=== Build finished: 2 errors, 0 warnings ===|

**anon** · 01-17-2011

This means that you have only declared that function but not implemented it (or aren't linking it).

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