| Topic: |
DEVELOP > c-Plus-Plus |
| User: |
"kscho" |
| Date: |
16 Sep 2003 01:13:42 AM |
| Object: |
How to implementing com interface? |
Hi~
i wanna implement like COM interface, but I have problem pass this pointer.
How can i pass this pointer in C ?
How can i pass this pointer in CPP (thus not occured error)?
//_______ test1.cpp _______________________________________
#include <stdio.h>
extern "C" void main_test();
class ITest {
public:
virtual void ftn(int pParam) = 0;
virtual void ftn222(int pParam) = 0;
};
class Test:public ITest{
public:
virtual void ftn(int pParam);
virtual void ftn222(int pParam);
int a;
};
// error occurs because this pointer passing
void Test:: ftn(int pParam){
a = 10; // this makes error, error occurs the time of access member
valuable
printf("ftn test\n");
}
void Test:: ftn222(int pParam){
printf("ftn test222\n");
}
extern "C" ITest *createTest(void){
return new Test();
}
extern "C" void deleteTest(void * pTest){
delete (Test*)pTest;
}
int main(int argc, char* argv[]){
main_test();
return 0;
}
//_______test2.c _______________________________
#include <stdio.h>
typedef struct I_XX {
void ( __stdcall *ftn ) (int );
void ( __stdcall *ftn222 ) (int );
} I_XX;
typedef struct XX{
const struct I_XX *lpVtbl;
}XX;
extern void *createTest(void);
extern void deleteTest(void * pTest);
void main_test()
{
XX* p = (XX*)createTest();
p->lpVtbl->ftn(10);
p->lpVtbl->ftn222(20);
deleteTest(p);
}
i'm referenced basetype.h
/** basetype.h
STDMETHOD_(ULONG,AddRef) (THIS) PURE;
#if defined(__cplusplus) && !defined(CINTERFACE)
define THIS void
#else
#define THIS INTERFACE FAR * This
#endif
**/
thanks in advance,
cho.
.
|
|
| User: "Rob Williscroft" |
|
| Title: Re: How to implementing com interface? |
16 Sep 2003 06:01:18 AM |
|
|
kscho wrote in news:bk66l1$9s2$1@news1.kornet.net:
i wanna implement like COM interface, but I have problem pass this
pointer.
Your code has a compiler specific dependancies ( e.g. __stdcall and
the way you assume stuff about the layout of vtables ). Standard C++
doesn't even assume the existance of vtables, any mechanism which
does the job is OK.
You need to ask this in a compiler specific newsgroup or possibly
a COM specific newsgroup.
Look for a group's starting with comp.os.ms-windows.programmer.*
and microsoft.public.* ( you may need to use microsoft's news server
to post to these, so the comp... ones may be prefered).
HTH
Rob.
--
http://www.victim-prime.dsl.pipex.com/
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