Multiple Type Class ...

[daniloa]

Hi everyone how are you ?

So I need a little trick or tip of how to do this: I have some classes in my project like Class A, Class B, Class C, etc; and I have a class that will comunicate me with one of then named Class D for sample see the code below:

int ClassD:egaQuantidadeCanais(LPSTR pClasse) throw(...){
try{
int iloQtde = 0;
LPVOID lpvloObj = NULL;
//
if (strcmp(pClasse, "1 - Dialogic Analógica&quot == 0 || strcmp(pClasse, "2 - Dialogic Digital&quot == 0){
lpvloObj = new ClassA;
iloQtde = ((ClassA)lpvloObj).PegaQtdCanais();
}
else if (strcmp(pClasse, "3 - TAPI Modem&quot == 0){
lpvloObj = new ClassB;
iloQtde = ((ClassB)lpvloObj).PegaQtdCanais();
}
else{
lpvloObj = new ClassC;
iloQtde = ((ClassC)lpvloObj).PegaQtdCanais();
}
return iloQtde;
}
catch(...){
dwgeErr = GetLastError();
return -1;
}
}
the compiler accept the code until the line lpvloObj = new cCtoUraDialogicSpring; but do not accept next line saying: " 'type cast' : cannot convert from 'LPVOID' to 'cCtoUraDialogicSpring' "

I want to know if is possible this code and if no how can I make a class that will be intermediate between many other tah have same methods (parametrs and returns) ???

Very Thanks,

Danilo Ameida

 

[Cagliostro]

you can cast 'LPVOID' to 'SomeClass*', not to 'SomeClass' and not to 'cSomeClassInstance'

Ion Filipski