c++ - Dll Plug-in basic questions -

for last couple of days i've been learning c++ make dll plug-in program.

my objective data(the flight plan's more precise) program , on first phase save them text file(second phase connect them python it's that). in header file imported file many classes , many functions(which given plugin development guide). class i'm interested in class caircraftflightplan , has functions inside this:

bool isreceived(void) const; //----------------------------------------------------------------- //  return : //      true    - if kind of fl received servers //      false   - else //-----------------------------------------------------------------  const char * getorigin ( void ) const ; //----------------------------------------------------------------- //  return : //      origin airport. //-----------------------------------------------------------------   int     getfinalaltitude ( void ) const ; //----------------------------------------------------------------- //  return : //      final requested altitude. //----------------------------------------------------------------- 

i have many doubts this, hope can help:

1-what mean having "nameoffuction"(void) const? receives nothing?how call these functions then

2-i not understand function "const char * getorigin ( void ) const ;",what want, const or char?

3-the comments below functions tell return or that. how return if function empty, it's "int getfinalaltitude(void) const"...

4-in source file, try call 1 of functions write txt file,how can this:

int airplane; ofstream textfile; textfile.open("fp.txt"); textfile<<int gettrueairspeed("mah545"); //i know there's error here, how solve it? textfile.close(); 

i'm sorry asking these (noob suppose) questions way specific search answer online(i tried already)

thank help

1. yes, takes no arguments call so: nameoffunction()

2. this takes no arguments called getorigin(). returns pointer const char.

3. as above, functions take no arguments return values.

4. delete int in front of function call. should rid of @ least 1 error.

   textfile<< gettrueairspeed("mah545");