The dialog edit control hexadecimal format input.

likang1986

you should subclass your edit control and ...
case WM_CHAR:
if(wParam>='0'&&wParam<='9'||wParam>='a'&&wParam<='f')
{
        sprintf(buff,"%c",wParam);
         strcat(TempBuff,buff);
         SetWindowText(hwnd,TempBuff);
SendMessage(hwnd, EM_SETSEL,strlen(TempBuff),-1);

}

wpl

Overload OnChar to deal with unnecessary characters.