I'm developing an application in C ++ Builder that has a Form that contains elements like ListBox , buttons, Labels , etc.
I can configure the events of each of these elements ( onClick , onEnter , onExit ...) within a .cpp file, however when I try to create a function inside this same .cpp that accesses the properties of the elements ( Visible , Enabled , Caption , etc.) I get an error:
"undefined symbol".
How do I use the elements contained in a Form within a function created by me.
Follow problem code.
//Função criada por mim, dentro da Unit1.cpp que contem o Form1 no qual está o ListBox1
void funcao(AnsiString parametro){
...
ListBox1->Items->Add("ItemParaListBox"); //Essa linha gera o erro "undefined symbol ListBox1"
}
//Função de fastcall realizada para edição de evento do elemento dentro da mesma Unit1.cpp
void __fastcall TForm1::BitBtn11Click(TObject *Sender){
...
ListBox1->Items->Add("ItemParaListBox"); //Funciona normalmente
}