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// @(#)objbase.h 1.4 95/09/25
// Copyright 1995 by Sun Microsystems, Inc.
//
// COM Basic Component Object Model definitions
//
// This has "enough COM" to compile (on UNIX) a recent version of the
// IIOP engine code, which more or less uses COM as a source standard.
//
// (It's unknown whether the C++ compilers on UNIX put vtables as the first
// member or not; that matters to folk writing "objects in C", relying on the
// COM ABI. In any case, the API to a pure C++ programmer is the same.)
//
// Note that Microsoft changed the header file structure so that some
// development environments now prefer "objbase.h" not "compobj.h".
//
#ifndef _compobj_h
#define _compobj_h
//
// Random data types that come from Microsoft's APIs.
//
typedef unsigned long ULONG;
typedef unsigned long HRESULT;
//
// Details of the procedure calling convention matter.
//
#define __stdcall // MS-Windows non-varargs call convention
//
// IDs come built from UUIDs
// IID -- interface ID
// CLSID -- implementation ID
//
typedef char IID [16]; // XXX actually a struct
typedef const IID &REFIID;
#define DEFINE_GUID(name,b,c,d,e,f,g,h,i,j,k,l) extern "C" const IID name;
//
// All objects in the "Component Object Model" (COM) inherit from
// this pure virtual base class.
//
DEFINE_GUID (IID_IUnknown, b,c,d,e,f,g,h,i,j,k,l)
class IUnknown {
public:
virtual HRESULT __stdcall QueryInterface (
REFIID riid,
void **ppv
) = 0;
virtual ULONG __stdcall AddRef () = 0;
virtual ULONG __stdcall Release () = 0;
};
// XXX haven't looked closely at COM's fault reporting yet ...
typedef unsigned long SCODE;
inline HRESULT ResultFromScode(SCODE scode) { return scode; }
#define NOERROR ((SCODE) 0)
#define E_NOINTERFACE ((SCODE) 17)
//
// VARIANT is OLE's extremely limited version of "Any". There are
// numerous definitions of this type in different MS environments;
// this one's the Win32 version. We need it here because part of
// the CORBA-COM mapping is conversions between Any and VARIANT.
//
// XXX not all of these types are worth trying to support portably,
// and even those that are worth supporting portably aren't fully
// supported at this writing.
//
typedef unsigned short VARTYPE;
enum VARENUM { // only types suitable for VARIANTs
VT_EMPTY = 0, // nothing
VT_NULL = 1, // SQL style ull (XXX)
VT_I2 = 2, // signed 2 byte integer
VT_I4 = 3, // signed 4 byte integer
VT_R4 = 4, // IEEE "single" floating point
VT_R8 = 5, // IEEE "double" floating point
VT_CY = 6, // currency
VT_DATE = 7, // date
VT_BSTR = 8, // counted string
VT_DISPATCH = 9, // IDispatch COM object
VT_ERROR = 10, // SCODE
VT_BOOL = 11, // true=1, false=0
VT_VARIANT = 12, // variant pointer
VT_UNKNOWN = 13, // IUnknown COM object
VT_UI1 = 17, // octet
VT_ARRAY = 0x2000, // SAFEARRAY * of more primitive type
VT_BYREF = 0x4000 // pointer to more primitive type
};
//
// Currency is an eight byte fixed point number (could be "long long")
//
struct CY {
#ifdef WORDS_BIGENDIAN
long Hi;
unsigned long Lo;
#else
unsigned long Lo;
long Hi;
#endif
};
//
// DATE format is days since 30-Dec-1889 ... days in the "whole"
// part, time in the fractional part (part of a day).
//
typedef double DATE;
struct VARIANT {
VARTYPE vt; // type ID
unsigned short wReserved1, wReserved2, wReserved3;
union {
//
// By-Value fields
//
long lVal; // VT_I4
unsigned char bVal; // VT_UI1
short iVal; // VT_I2
float fltVal; // VT_R4
double dblVal; // VT_R8
// VARIANT_BOOL bool; // VT_BOOL
SCODE scode; // VT_ERROR
CY cyVal; // VT_CY
DATE date; // VT_DATE
// BSTR bstrVal; // VT_BSTR
IUnknown *punkVal; // VT_UNKNOWN
// IDispatch *pdispVal; // VT_DISPATCH
// SAFEARRAY *parray; // VT_ARRAY
//
// By-Reference fields (for VARIANTARG)
//
unsigned char *pbVal; // VT_BYREF|VT_UI1
short *piVal; // VT_BYREF|VT_I2
long *plVal; // VT_BYREF|VT_I4
float *pfltVal; // VT_BYREF|VT_R4
double *pdblVal; // VT_BYREF|VT_R8
// VARIANT_BOOL *pbool; // VT_BYREF|VT_BOOL
SCODE *pscode; // VT_BYREF|VT_ERROR
CY *pcyVal; // VT_BYREF|VT_CY
DATE *pdate; // VT_BYREF|VT_DATE
// BSTR *pbstrVal; // VT_BYREF|VT_BSTR
IUnknown **ppunkVal; // VT_BYREF|VT_UNKNOWN
// IDispatch **ppdisVal; // VT_BYREF|VT_DISPATCH
// SAFEARRAY *pparray; // VT_BYREF|VT_ARRAY
VARIANT *pvarVal; // VT_BYREF|VT_VARIANT
void *byref; // generic VT_BYREF
};
};
#endif // _compobj_h
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