|
|
/***
*dispcalc.cpp * * Copyright (C) 1992-1994, Microsoft Corporation. All Rights Reserved. * Information Contained Herein Is Proprietary and Confidential. * *Purpose: * This module implements the basic user interface and arithmetic * functionality of the IDispatch calculator. * * The implementation of IDispatch it via aggregation with an * instance of the "standard" IDispatch implementation, which is * initialized with a DispTypeInfo constructed from an INTERFACEDATA * description. * *Implementation Notes: * *****************************************************************************/
#include "dispcalc.h"
CCalc FAR* g_pcalc = NULL;
unsigned long g_dwCCalcCF = 0; unsigned long g_dwRegisterCCalc = 0;
#ifdef _MAC
extern Boolean g_fQuit; #endif //_MAC
CCalc::CCalc() : m_arith(this) { m_refs = 0; #ifdef _MAC
m_pdlg = nil; #else
m_hwnd = NULL; #endif
m_punkStdDisp = NULL; }
/***
*CCalc *CCalc::Create(void) *Purpose: * Create an instance of the IDispatch calculator, build a * TypeInfo that describes the exposed functionality and * aggregate with an instance of CStdDispatch that has been * initialized with this TypeInfo. * *Entry: * None * *Exit: * return value = CCalc*, NULL if the creation failed. * ***********************************************************************/ CCalc FAR* CCalc::Create() { HRESULT hresult; CCalc FAR* pcalc; CArith FAR* parith; ITypeInfo FAR* ptinfo; IUnknown FAR* punkStdDisp; extern INTERFACEDATA NEARDATA g_idataCCalc;
if((pcalc = new FAR CCalc()) == NULL) return NULL; pcalc->AddRef();
parith = &(pcalc->m_arith);
// Build a TypeInfo for the functionality on this object that
// is being exposing for external programmability.
//
hresult = CreateDispTypeInfo( &g_idataCCalc, LOCALE_SYSTEM_DEFAULT, &ptinfo); if(hresult != NOERROR) goto LError0;
// Create and aggregate with an instance of the default
// implementation of IDispatch that is initialized with our
// TypeInfo.
//
hresult = CreateStdDispatch( pcalc, // controlling unknown
parith, // instance to dispatch on
ptinfo, // typeinfo describing the instance
&punkStdDisp);
ptinfo->Release();
if(hresult != NOERROR) goto LError0;
pcalc->m_punkStdDisp = punkStdDisp;
return pcalc;
LError0:; pcalc->Release();
return NULL; }
//---------------------------------------------------------------------
// IUnknown methods
//---------------------------------------------------------------------
STDMETHODIMP CCalc::QueryInterface(REFIID riid, void FAR* FAR* ppv) { if(IsEqualIID(riid, IID_IUnknown)){ *ppv = this; }else if(IsEqualIID(riid, IID_IDispatch)){ return m_punkStdDisp->QueryInterface(riid, ppv); }else { *ppv = NULL; return ResultFromScode(E_NOINTERFACE); }
AddRef(); return NOERROR; }
STDMETHODIMP_(unsigned long) CCalc::AddRef() { return ++m_refs; }
STDMETHODIMP_(unsigned long) CCalc::Release() { if(--m_refs == 0){ if(m_punkStdDisp != NULL) m_punkStdDisp->Release(); #ifndef _MAC
PostQuitMessage(0); #endif
delete this; return 0; } return m_refs; }
//---------------------------------------------------------------------
// Arithmetic features
//---------------------------------------------------------------------
STDMETHODIMP_(void) CArith::Clear() { m_opnd = 0; m_accum = 0; m_op = OP_NONE; m_state = STATE_LOPND; }
STDMETHODIMP_(void) CArith::put_Accum(long l) { m_accum = l; }
STDMETHODIMP_(long) CArith::get_Accum() { return m_accum; }
STDMETHODIMP_(void) CArith::put_Opnd(long l) { m_opnd = l; }
STDMETHODIMP_(long) CArith::get_Opnd() { return m_opnd; }
STDMETHODIMP_(void) CArith::put_Op(short op) { m_op = op; }
STDMETHODIMP_(short) CArith::get_Op() { return m_op; }
STDMETHODIMP_(short) CArith::Eval() { if(m_op == OP_NONE) return 0;
switch(m_op){ case OP_PLUS: m_accum += m_opnd; break; case OP_MINUS: m_accum -= m_opnd; break; case OP_MULT: m_accum *= m_opnd; break; case OP_DIV: m_accum = (m_opnd == 0) ? 0 : (m_accum / m_opnd); break; default: // ASSERT(UNREACHED);
return 0; }
m_state = STATE_EVAL;
return 1; }
//---------------------------------------------------------------------
// User Interface features
//---------------------------------------------------------------------
/***
*void CArith::Display() *Purpose: * Display the contents of the register currently being edited. * *Entry: * None * *Exit: * None * ***********************************************************************/ STDMETHODIMP_(void) CArith::Display() { VARIANT var;
VariantInit(&var); V_VT(&var) = VT_I4; V_I4(&var) = (m_state == STATE_ROPND) ? m_opnd : m_accum; VariantChangeType(&var, &var, 0, VT_BSTR);
#ifdef _MAC
{ Rect rcItem; Handle hItem; char str[255]; short sItemKind;
strcpy(str, V_BSTR(&var)); GetDItem(m_pcalc->m_pdlg, IDC_DISPLAY, &sItemKind, &hItem, &rcItem); SetIText(hItem, c2pstr(str)); } #else
SetDlgItemText(m_pcalc->m_hwnd, IDC_DISPLAY, STRING(V_BSTR(&var))); #endif
VariantClear(&var); }
STDMETHODIMP_(short) CArith::Button(BSTR bstrButton) { int i, button;
static struct { OLECHAR ch; int idc; } NEARDATA rgIdcOfCh[] = { { OLESTR('+'), IDC_PLUS } , { OLESTR('-'), IDC_MINUS } , { OLESTR('*'), IDC_MULT } , { OLESTR('/'), IDC_DIV } , { OLESTR('C'), IDC_CLEAR } , { OLESTR('c'), IDC_CLEAR } , { OLESTR('='), IDC_EQUALS } , { OLESTR('0'), IDC_ZERO } , { OLESTR('1'), IDC_ONE } , { OLESTR('2'), IDC_TWO } , { OLESTR('3'), IDC_THREE } , { OLESTR('4'), IDC_FOUR } , { OLESTR('5'), IDC_FIVE } , { OLESTR('6'), IDC_SIX } , { OLESTR('7'), IDC_SEVEN } , { OLESTR('8'), IDC_EIGHT } , { OLESTR('9'), IDC_NINE } , { (OLECHAR)-1 , -1 } };
// if the string is more that 1 character long, then we know its wrong.
if(SysStringLen(bstrButton) > 1) return 0;
// translate button string into control ID
for(i = 0;; ++i){ if(rgIdcOfCh[i].ch == -1) return 0; if(rgIdcOfCh[i].ch == bstrButton[0]){ button = rgIdcOfCh[i].idc; break; } }
return ButtonPush(button); }
// the following method is internal, and not exposed for programmability
int CArith::ButtonPush(int button) { if(button >= IDC_ZERO && button <= IDC_NINE){
long lVal = button - IDC_ZERO;
switch(m_state){ case STATE_EVAL: m_accum = lVal; m_state = STATE_LOPND; break; case STATE_OP: m_opnd = lVal; m_state = STATE_ROPND; break; case STATE_LOPND: m_accum = (m_accum * 10) + lVal; break; case STATE_ROPND: m_opnd = (m_opnd * 10) + lVal; break; }
}else if(button >= IDC_PLUS && button <= IDC_DIV){
if(m_state == STATE_LOPND){ m_opnd = m_accum; m_state = STATE_OP; m_op = button - IDC_PLUS + OP_PLUS; }
}else if(button == IDC_EQUALS){
if(m_state > STATE_LOPND) Eval();
}else if (button == IDC_CLEAR){
Clear();
}else{
return 0; // unknown button
}
// Flash the button
#ifdef _MAC
{ Rect rcItem; long lDummy; Handle hItem; short sItemKind;
GetDItem(m_pcalc->m_pdlg, button, &sItemKind, &hItem, &rcItem); HiliteControl((ControlHandle)hItem, 1); Delay(6, &lDummy); HiliteControl((ControlHandle)hItem, 0); } #else
SendMessage(m_pcalc->m_hwnd, BM_SETSTATE, 1, 0L); SendMessage(m_pcalc->m_hwnd, BM_SETSTATE, 0, 0L); #endif
// Update the calculator display
Display();
return 1; }
/***
*void CArith::Quit() *Purpose: * *Entry: * None * *Exit: * None * ***********************************************************************/ STDMETHODIMP_(void) CArith::Quit() { #ifndef _MAC
PostQuitMessage(0); #else
g_fQuit = 1; #endif
}
//---------------------------------------------------------------------
// The CCalc Class Factory
//---------------------------------------------------------------------
IClassFactory FAR* CCalcCF::Create() { return new FAR CCalcCF(); }
STDMETHODIMP CCalcCF::QueryInterface(REFIID riid, void FAR* FAR* ppv) { if(IsEqualIID(riid, IID_IUnknown) || IsEqualIID(riid, IID_IClassFactory)){ AddRef(); *ppv = this; return NOERROR; } *ppv = NULL; return ResultFromScode(E_NOINTERFACE); }
STDMETHODIMP_(unsigned long) CCalcCF::AddRef() { return ++m_refs; }
STDMETHODIMP_(unsigned long) CCalcCF::Release() { if(--m_refs == 0){ delete this; return 0; } return m_refs; }
STDMETHODIMP CCalcCF::CreateInstance( IUnknown FAR* punkOuter, REFIID riid, void FAR* FAR* ppv) { if(punkOuter != NULL) return ResultFromScode(CLASS_E_NOAGGREGATION); return g_pcalc->QueryInterface(riid, ppv); }
STDMETHODIMP #ifdef _MAC
CCalcCF::LockServer(unsigned long fLock) #else
CCalcCF::LockServer(BOOL fLock) #endif
{ UNUSED(fLock); return NOERROR; }
//---------------------------------------------------------------------
// Ole Init/Uninit
//---------------------------------------------------------------------
HRESULT UninitOle() { if(g_dwRegisterCCalc != 0) RevokeActiveObject(g_dwRegisterCCalc, NULL);
if(g_dwCCalcCF != 0) CoRevokeClassObject(g_dwCCalcCF);
if(g_pcalc != NULL) g_pcalc->Release();
OleUninitialize();
return NOERROR; }
#ifdef _MAC
struct regentry{ char *szKey; char *szValue; } g_rgregentry[] = {
{ "CLSID\\{00020467-0000-0000-C000-000000000046}", "OLE Automation DispCalc 1.0 Application" }
, { "CLSID\\{00020467-0000-0000-C000-000000000046}\\LocalServer", "DCLC" }
, { "CLSID\\{00020467-0000-0000-C000-000000000046}\\ProgID", "Dispcalc.Application" }
, { "CLSID\\{00020467-0000-0000-C000-000000000046}\\InprocHandler", "OLE2:Def$DefFSet" }
, { "DCLC", "{00020467-0000-0000-C000-000000000046}" }
, { "Dispcalc.Application\\CLSID", "{00020467-0000-0000-C000-000000000046}" }
};
HRESULT EnsureRegistration() { HKEY hkey;
if(RegOpenKey(HKEY_CLASSES_ROOT, "DCLC", &hkey) == NOERROR){ RegCloseKey(hkey); return NOERROR; }
for(int i = 0; i < DIM(g_rgregentry); ++i){ if(RegSetValue(HKEY_CLASSES_ROOT, g_rgregentry[i].szKey, REG_SZ, g_rgregentry[i].szValue, 0) != ERROR_SUCCESS) return ResultFromScode(E_FAIL); }
return NOERROR; } #endif
/***
*HRESULT InitOle(void) *Purpose: * Initialize Ole, and register our class factories. * *Entry: * None * *Exit: * None * ***********************************************************************/ HRESULT InitOle() { HRESULT hresult; IClassFactory FAR* pcf;
if((hresult = OleInitialize(NULL)) != NOERROR) goto LError0;
#ifdef _MAC
if((hresult = EnsureRegistration()) != NOERROR) goto LError0; #endif
// create the single global instance of CCalc
if((g_pcalc = CCalc::Create()) == NULL){ hresult = ResultFromScode(E_OUTOFMEMORY); goto LError0; }
if((pcf = CCalcCF::Create()) == NULL) goto LError1;
hresult = CoRegisterClassObject( CLSID_CCalc, pcf, CLSCTX_LOCAL_SERVER, REGCLS_MULTIPLEUSE, &g_dwCCalcCF); if(hresult != NOERROR) goto LError2;
hresult = RegisterActiveObject( g_pcalc, CLSID_CCalc, NULL, &g_dwRegisterCCalc); if(hresult != NOERROR) goto LError2;
pcf->Release();
return NOERROR;
LError2:; pcf->Release();
LError1:; UninitOle();
LError0:; return hresult; }
|