[SOLVED] macro defination

shamjs · 11-16-2011, 06:38 AM

Hi all,
im using macro in my project and im using g++ compiler to copile the code

here is my code

Code:

/*******olux.h*********/
#ifndef _OLUX_H
#define _OLUX_H

#if WIN32
#define MY_API(ret_type) ret_type __stdcall
#else
#define MY_API(ret_type) extern "C" __declspec(dllexport) ret_type 
#endif

MY_API(long) olpOpenPredictor(long *ohPredHandle);//line 168
#endif

Code:

/*******olupx.cpp*********/

MY_API(long) olpOpenPredictor( long *ohPredHandle)//this func is in global scope
{
.//here i have some code
.
}

whenever i compile this program i will get the error has
olupx/inc/olux.h:168: error: expected constructor, destructor, or type conversion before â(â token
please suggest me where i have went wrong

millgates · 11-16-2011, 06:50 AM

what exactly is

Code:

#if WIN32

supposed to do?
didn't you mean

Code:

#ifdef _WIN32

or

Code:

#if defined(_WIN32)

shamjs · 11-16-2011, 07:13 AM

Since im compiling the same program in windows also hence im using
#if WIN32

ya i mean to say #ifdef _WIN32 or #if defined(_WIN32)

NevemTeve · 11-16-2011, 07:21 AM

Fixed version:

Code:

#if WIN32
#define MY_API(ret_type) ret_type __stdcall
#else
#define MY_API(ret_type) ret_type
#endif

Reasons:
1. extern "C" doesn't belong here, specify globally
2. __declspec(dllexport) means nothing for g++

shamjs · 11-17-2011, 12:07 AM

now i have declared extern "C" globally
here is my code

Code:

/*********olux.h*********/
#ifndef _OLUX_H
#define _OLUX_H

#if WIN32
#define MY_API(ret_type) ret_type __stdcall
#else
#define MY_API(ret_type) ret_type //line 100
#endif

#if defined(__GNUC__) || #if WIN32 //line 168
#ifdef  __cplusplus
extern "C"
{
#endif
MY_API(long) olpOpenPredictor(long *ohPredHandle);
#ifdef  __cplusplus
}
#endif
#endif
#endif

Code:

/*******olupx.cpp*********/

MY_API(long) olpOpenPredictor( long *ohPredHandle)//this func is in global scope
{
.//here i have some code
.
}

but now im getting the error has
olupx/inc/olux.h:168:33: error: missing binary operator before token "WIN32"

im using #ifdef WIN32 in line 168 (because i need that same code to be executed on windows)

and whether it is required to use __attribute__ in line 100(i.e #define MY_API(ret_type) __attribute__ ret_type)
please suggest me to do
waiting for your reply.............

NevemTeve · 11-17-2011, 02:43 AM

Code:

#ifndef _OLUX_H
#define _OLUX_H

#ifdef WIN32
#define MY_API(ret_type) ret_type __stdcall
#else
#define MY_API(ret_type) ret_type
#endif

#ifdef  __cplusplus
extern "C" {
#endif

MY_API(long) olpOpenPredictor(long *ohPredHandle);

#ifdef  __cplusplus
}
#endif

#endif