function pointer on classfunctions
-
H@llo I have a class with some memberfunctions and like to refer to these by unsing functionpointers. all my tries ends up in errors some sample here:
// myCom.h class myCom { public: int send(int,char*); int read(int,unsigned int,BYTE*); };// action.h class myCom; typedef int (*cdout)(int ,char* ); typedef int (*cdread)(int ,unsigned int ,BYTE* ); class action { myCom* mCom; ... };// action.cpp ... mCom = new myCom; ... cdout test = mCom->send; // error C2440: 'initializing' : cannot convert from '' to 'int (__cdecl *)(int,char *)' or cdout test; test = mCom->send; // error C2440: '=' : cannot convert from 'int (__thiscall CINTERFACE::*)(int,char *)' to 'int (__cdecl *)(int,char *)' ...:confused: Anyone any idea?? THX -
H@llo I have a class with some memberfunctions and like to refer to these by unsing functionpointers. all my tries ends up in errors some sample here:
// myCom.h class myCom { public: int send(int,char*); int read(int,unsigned int,BYTE*); };// action.h class myCom; typedef int (*cdout)(int ,char* ); typedef int (*cdread)(int ,unsigned int ,BYTE* ); class action { myCom* mCom; ... };// action.cpp ... mCom = new myCom; ... cdout test = mCom->send; // error C2440: 'initializing' : cannot convert from '' to 'int (__cdecl *)(int,char *)' or cdout test; test = mCom->send; // error C2440: '=' : cannot convert from 'int (__thiscall CINTERFACE::*)(int,char *)' to 'int (__cdecl *)(int,char *)' ...:confused: Anyone any idea?? THXyou have
typedef int (*cdout)(int ,char* );andint send(int,char*);but send is a member function... its synopsis is not what you wrote. it gets an implicit parameter (this).send()actually has 3 parameters. if you want to use it, you must declare it as astaticfunction. but if it uses data members of its class, it won't see them anymore. so you'll have to pass a new parameter explicitely to yoursend()function to allow it accessing the members. You'll also have to change thecdoutdeclaration... cheers,
TOXCCT >>> GEII power
[toxcct][VisualCalc] -
you have
typedef int (*cdout)(int ,char* );andint send(int,char*);but send is a member function... its synopsis is not what you wrote. it gets an implicit parameter (this).send()actually has 3 parameters. if you want to use it, you must declare it as astaticfunction. but if it uses data members of its class, it won't see them anymore. so you'll have to pass a new parameter explicitely to yoursend()function to allow it accessing the members. You'll also have to change thecdoutdeclaration... cheers,
TOXCCT >>> GEII power
[toxcct][VisualCalc]Hallo OK - got it so far. :) But at least i like to send this functionpointer to a created dll. So if
send()is static i have to change to much code. Changeing thetypedefrestricts the needed parsing possibility for my dll. :doh: I'm sorry, but i'm not very good in c programming. Is there any other fast possibility to call a dll function that communicating with class member functions? :confused: THX -
Hallo OK - got it so far. :) But at least i like to send this functionpointer to a created dll. So if
send()is static i have to change to much code. Changeing thetypedefrestricts the needed parsing possibility for my dll. :doh: I'm sorry, but i'm not very good in c programming. Is there any other fast possibility to call a dll function that communicating with class member functions? :confused: THX -
H@llo I have a class with some memberfunctions and like to refer to these by unsing functionpointers. all my tries ends up in errors some sample here:
// myCom.h class myCom { public: int send(int,char*); int read(int,unsigned int,BYTE*); };// action.h class myCom; typedef int (*cdout)(int ,char* ); typedef int (*cdread)(int ,unsigned int ,BYTE* ); class action { myCom* mCom; ... };// action.cpp ... mCom = new myCom; ... cdout test = mCom->send; // error C2440: 'initializing' : cannot convert from '' to 'int (__cdecl *)(int,char *)' or cdout test; test = mCom->send; // error C2440: '=' : cannot convert from 'int (__thiscall CINTERFACE::*)(int,char *)' to 'int (__cdecl *)(int,char *)' ...:confused: Anyone any idea?? THXSee Class function callback[^]