FIXEDPTMARSHALER.C

// Copyright (c) 1997  Microsoft Corporation.  All rights reserved. 
//===================================================================== 
// Sample Java/COM Marshaling Hook Class. 
// 
// Java Type:  double 
// Com  Type:  struct { 
//                 WORD     fract; 
//                 short    value; 
//             } FIXED; 
//===================================================================== 
 
 
 
#pragma hdrstop 
 
#include <windows.h> 
#include "native.h" // Raw Native Interface declarations. 
 
 
typedef FIXED *PFIXED, **PPFIXED; 
 
 
 
#ifdef __cplusplus 
#define EXTERNC     extern "C" 
#else 
#define EXTERNC 
#endif 
 
 
// Macro for declaring RNI Java methods's (and encapsulating the java class package.) 
#define JAVAMETHOD(typ, name) \ 
    __declspec(dllexport) \ 
    EXTERNC \ 
    typ __cdecl FixedPtMarshaler_##name 
 
 
#define LOGCALL(hookname) OutputDebugString("FixedPtMarshaler." hookname "() called.\n") 
 
// Export that tells what RNI version we were built under. 
DWORD __cdecl RNIGetCompatibleVersion() 
{ 
  return RNIVER; 
} 
 
 
//========================================================================== 
// toJava 
//========================================================================== 
JAVAMETHOD(double, toJava) (OBJECT*x, PPFIXED ppFIXED, int flags) 
{ 
    const FIXED *pFIXED = *ppFIXED; 
 
    LOGCALL("toJava"); 
 
    // Convert FIXED to double. 
    return ((double)(pFIXED->value)) + ((double)(pFIXED->fract)) / 65536.0; 
} 
 
 
//========================================================================== 
// copyToExternal 
//========================================================================== 
JAVAMETHOD(void, copyToExternal) (OBJECT*x, double javaval, PPFIXED ppFIXED, int flags) 
{ 
    FIXED *pFIXED = *ppFIXED; 
 
    LOGCALL("copyToExternal"); 
 
    // Convert double to FIXED. 
    if (javaval > 32767.0 || javaval < -32768.0) { 
        SignalErrorPrintf("java/lang/IllegalArgumentException", "Overflow on double->FIXED conversion."); 
    } else { 
        pFIXED->value = (short)javaval; 
        pFIXED->fract = (short) ((javaval - (short)javaval) * 65536.0); 
    } 
} 
 
 
 
 
//========================================================================== 
// TODO: Remove this copy of DllMain if you are embedding this file in your 
//  own DLL. 
// DLL Loader entry point. 
//========================================================================== 
BOOL WINAPI DllMain(HINSTANCE hmod, DWORD dwReason, 
                                PVOID pvReserved) 
{ 
   return TRUE; 
}