The problem when trying to use C++ code with eggdrop is that eggdrop uses some global function table for imports which does not mix very with C++.
A simple "extern C" is not enough to be able to include the "module.h".
So my approach is to use a wrapper.
We start building normal module which wraps all stuff we need and compile that one with C.
Then we take the header file of that and just include it in our C++ files.
At the end we link all together.
Only thing we need are some structs from eggdrop to be able to bind/unbind commands from C++.
The whole thing ofcourse only works well when we don't need A LOT of eggdrop core functions cause then it might be a lot work to wrap them all
My example module is called "cpphello.mod" and it just outputs a message to channel when triggered via "!hello".
Code:
/* * hello.h -- part of cpphello.mod * * Example how to write an eggdrop module in C++ * * Originally written by Kappa007 2006-01-21 * * * Copyright (c) by Kappa007. All rights reserved. */#ifndef __HELLO_H__#define __HELLO_H__#ifdef __cplusplusextern "C"{#endif // __cplusplus /*** Common typedefs and structs from eggdrop ***/ typedef void (*Function) (); struct flag_record { int match; int global; int udef_global; int bot; int chan; int udef_chan; }; typedef unsigned short int u_16bit_t; typedef unsigned char u_8bit_t; typedef struct tcl_cmd_b { struct tcl_cmd_b *next; struct flag_record flags; char *func_name; /* Proc name. */ int hits; /* Number of times this proc was triggered. */ u_8bit_t attributes; /* Flags for this entry. TC_* */ } tcl_cmd_t; typedef struct tcl_bind_mask_b { struct tcl_bind_mask_b *next; tcl_cmd_t *first; /* List of commands registered for this bind. */ char *mask; u_8bit_t flags; /* Flags for this entry. TBM_* */ } tcl_bind_mask_t; typedef struct tcl_bind_list_b { struct tcl_bind_list_b *next; tcl_bind_mask_t *first; /* Pointer to registered binds * for this list. */ char name[5]; /* Name of the bind. */ u_8bit_t flags; /* Flags for this element. HT_* */ ::Function func; /* Function used as the Tcl calling interface * for procs actually representing C functions. */ } tcl_bind_list_t, *p_tcl_bind_list; typedef struct { char *name; char *flags; ::Function func; char *funcname; } cmd_t; /*** Prototypes ***/ int BindCommand(unsigned char table, cmd_t* cc, unsigned char bind); void PutServer(const char* text); void PutDCC(const int idx, const char* text);#ifdef __cplusplus}#endif // __cplusplus#endif // __HELLO_H__Code:
/* * hello.c -- part of cpphello.mod * * Example how to write an eggdrop module in C++ * * Originally written by Kappa007 2006-01-21 * * * Copyright (c) by Kappa007. All rights reserved. */#define MODULE_NAME "CppHello"#include "src/mod/module.h"#include <stdlib.h>#undef global/*** Include your C++ exports here ***/#include "hello.hpp"static Function *global = NULL;static int CppHello_expmem(){ return 0;}static void CppHello_report(int idx, int details){ dprintf(idx, "%s running.", MODULE_NAME);}static char* CppHello_close(){ ShutdownCppModule(); module_undepend(MODULE_NAME); return NULL;}EXPORT_SCOPE char* CppHello_start();static Function CppHello_table[] = { (Function) CppHello_start, (Function) CppHello_close, (Function) CppHello_expmem, (Function) CppHello_report,};char* CppHello_start(Function *global_funcs){ global = global_funcs; module_register(MODULE_NAME, CppHello_table, 1, 0); //TODO: check module dependencies here // Call the "init" of your C++ code InitCppModule(); return NULL;}/*** wrapper functions ***/int BindCommand(unsigned char table, cmd_t* cc, unsigned char bind){ if (cc == NULL) { return -1; } // get the bind table p_tcl_bind_list H_temp; switch (table) { case 0: H_temp = find_bind_table("dcc"); break; case 1: H_temp = find_bind_table("msg"); break; case 2: H_temp = find_bind_table("pub"); break; default: return -1; } if (!H_temp) return -1; // add or remove commands if (bind != 0) { add_builtins(H_temp, cc); } else { rem_builtins(H_temp, cc); } return 0;}void PutServer(const char* text){ dprintf(DP_SERVER, text);}void PutDCC(const int idx, const char* text){ dprintf(idx, text);}Code:
/* * hello.hpp -- part of cpphello.mod * * Example how to write an eggdrop module in C++ * * Originally written by Kappa007 2006-01-21 * * * Copyright (c) by Kappa007. All rights reserved. */#ifndef __HELLO_HPP__#define __HELLO_HPP__#ifdef __cplusplusextern "C"{#endif // __cplusplusvoid InitCppModule();void ShutdownCppModule();#ifdef __cplusplus}#endif // __cplusplus#endif // __HELLO_HPP__Code:
/* * hello.cpp -- part of cpphello.mod * * Example how to write an eggdrop module in C++ * * Originally written by Kappa007 2006-01-21 * * * Copyright (c) by Kappa007. All rights reserved. */#include "hello.h"#include "hello.hpp"#include <string>using namespace std;class MyHelloClass;static MyHelloClass*myHelloClass = NULL;int ChanHello(char *nick, char *host, char *hand, char *channel, char *text);class MyHelloClass{ private: cmd_t*myCommandTable; stringmyReply; public: MyHelloClass(string aReply) : myCommandTable( NULL ), myReply( aReply ) { myCommandTable = new cmd_t[2]; myCommandTable[0].name = "!hello"; myCommandTable[0].flags = ""; myCommandTable[0].func = reinterpret_cast<Function>(&ChanHello); myCommandTable[0].funcname = NULL; memset(static_cast<void*>(&myCommandTable[1]), 0, sizeof(cmd_t)); ::BindCommand(2, myCommandTable, true); } ~MyHelloClass() { ::BindCommand(2, myCommandTable, false); if (myCommandTable != NULL) delete[] myCommandTable; } stringReply() { return myReply; }};void InitCppModule(){ myHelloClass = new MyHelloClass("Hello from C++!");}void ShutdownCppModule(){ if (myHelloClass != NULL) { delete myHelloClass; }}int ChanHello(char *nick, char *host, char *hand, char *channel, char *text){ string aMsg = ""; aMsg += "PRIVMSG "; aMsg += channel; aMsg += " :"; aMsg += myHelloClass->Reply(); PutServer( aMsg.c_str() ); return 0;}Code:
# Makefile for src/mod/cpphello.mod/srcdir = .doofus:@echo ""@echo "Let's try this from the right directory..."@echo ""@cd ../../../ && makestatic: ../cpphello.omodules: ../../../cpphello.$(MOD_EXT)../hello.o:$(CC) $(CFLAGS) $(CPPFLAGS) -DMAKING_MODS -c $(srcdir)/hello.c@rm -f ../hello.omv hello.o ../../hello_cpp.o:$(CC) $(CFLAGS) $(CPPFLAGS) -DMAKING_MODS -c $(srcdir)/hello.cpp -o $(srcdir)/hello_cpp.o@rm -f ../hello_cpp.omv hello_cpp.o ../../../../cpphello.$(MOD_EXT): \../hello.o \../hello_cpp.o$(LD) -o ../../../cpphello.$(MOD_EXT) ../hello.o ../hello_cpp.o -lstdc++ $(XLIBS) $(MODULE_XLIBS)$(STRIP) ../../../cpphello.$(MOD_EXT)depend:$(CC) $(CFLAGS) $(CPPFLAGS) -MM $(srcdir)/cpphello.c > .dependclean:@rm -f .depend *.o *.$(MOD_EXT) *~distclean: clean#safety hash../cpphello.o: .././cpphello.mod/cpphello.c ../../../src/mod/module.h \ ../../../src/main.h ../../../src/lang.h ../../../src/eggdrop.h \ ../../../src/flags.h ../../../src/proto.h ../../../lush.h \ ../../../src/misc_file.h ../../../src/cmdt.h ../../../src/tclegg.h \ ../../../src/tclhash.h ../../../src/chan.h ../../../src/users.h \ ../../../src/compat/compat.h ../../../src/compat/inet_aton.h \ ../../../src/compat/snprintf.h \ ../../../src/compat/memset.h ../../../src/compat/memcpy.h \ ../../../src/compat/strcasecmp.h ../../../src/mod/modvals.h \ ../../../src/tandem.hCode:
$ uname -aCYGWIN_NT-5.2 BETA 1.5.18(0.132/4/2) 2005-07-02 20:30 x86_64 unknown unknown Cygwin$ gcc -vReading specs from /usr/lib/gcc/i686-pc-cygwin/3.4.4/specsConfigured with: /gcc/gcc-3.4.4/gcc-3.4.4-1/configure --verbose --prefix=/usr --exec-prefix=/usr --sysconfdir=/etc --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --enable-languages=c,ada,c++,d,f77,java,objc --enable-nls --without-included-gettext --enable-version-specific-runtime-libs --without-x --enable-libgcj --disable-java-awt --with-system-zlib --enable-interpreter --disable-libgcj-debug --enable-threads=posix --enable-java-gc=boehm --disable-win32-registry --enable-sjlj-exceptions --enable-hash-synchronization --enable-libstdcxx-debug : (reconfigured)Thread model: posixgcc version 3.4.4 (cygming special) (gdc 0.12, using dmd 0.125)Have fun!
Regards,
Kappa007
Statistics: Posted by Kappa007 — Fri Jan 20, 2006 10:14 pm
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