LINES.CPP (LINES OLE Sample)

/*************************************************************************

OLE Automation Lines object
lines.cpp
CLines collection implementation
Written by Microsoft Product Support Services, Windows Developer Support
(c) Copyright Microsoft Corp. 1993 All Rights Reserved
***********************************************************************/

#include <windows.h>

#include <windowsx.h>

#ifdef WIN16

#include <ole2.h>

#include <compobj.h>

#include <dispatch.h>

#include <variant.h>

#include <olenls.h>

#endif

#include "lines.h"

* CLines::Create

* Purpose:

* Creates an instance of a Lines collection object and initializes it.

* Parameters:

* lMaxSize Maximum number of items that can added to collection.

* lLBound Lower bound of index of collection.

* pPane Pointer to pane that contains this collection. Required because the pane coordinates

* the lines and points collection.

* ppLines Returns Lines collection object.

* Return Value:

* HRESULT

HRESULT

CLines::Create(ULONG lMaxSize, long lLBound, CPane FAR* pPane, CLines FAR* FAR* ppLines)

{

HRESULT hr;

CLines FAR* pLines = NULL;

SAFEARRAYBOUND sabound[1];

*ppLines = NULL;

// Create new collection

pLines = new CLines();

if (pLines == NULL)

goto error;

pLines->m_cMax = lMaxSize;

pLines->m_cElements = 0;

pLines->m_lLBound = lLBound;

pLines->m_pPane = pPane;

// Load type information for the Lines collection from type library.

hr = LoadTypeInfo(&pLines->m_ptinfo, IID_ILines);

if (FAILED(hr))

goto error;

// Create a safe array of variants which is used to implement the collection.

sabound[0].cElements = lMaxSize;

sabound[0].lLbound = lLBound;

pLines->m_psa = SafeArrayCreate(VT_VARIANT, 1, sabound);

if (pLines->m_psa == NULL)

{

hr = ResultFromScode(E_OUTOFMEMORY);

goto error;

}

*ppLines = pLines;

return NOERROR;

error:

if (pLines == NULL)

return ResultFromScode(E_OUTOFMEMORY);

if (pLines->m_ptinfo)

pLines->m_ptinfo->Release();

if (pLines->m_psa)

SafeArrayDestroy(pLines->m_psa);

pLines->m_psa = NULL;

pLines->m_ptinfo = NULL;

delete pLines;

return hr;

}

* CLines::CLines

* Purpose:

* Constructor for CLines object. Initializes members to NULL.

#pragma warning (disable : 4355)

CLines::CLines() : m_SupportErrorInfo(this, IID_ILines)

#pragma warning (default : 4355)

{

m_cRef = 0;

m_psa = NULL;

m_ptinfo = NULL;

}

* CLines::~CLines

* Purpose:

* Destructor for CLines object.

CLines::~CLines()

{

if (m_ptinfo) m_ptinfo->Release();

if (m_psa) SafeArrayDestroy(m_psa);

}

* CLines::QueryInterface, AddRef, Release

* Purpose:

* Implements IUnknown::QueryInterface, AddRef, Release

STDMETHODIMP

CLines::QueryInterface(REFIID iid, void FAR* FAR* ppv)

{

*ppv = NULL;

if (iid == IID_IUnknown || iid == IID_ILines || iid == IID_IDispatch)

*ppv = this;

else if (iid == IID_ISupportErrorInfo)

*ppv = &m_SupportErrorInfo;

else return ResultFromScode(E_NOINTERFACE);

AddRef();

return NOERROR;

}

STDMETHODIMP_(ULONG)

CLines::AddRef(void)

{

#ifdef _DEBUG

TCHAR ach[50];

wsprintf(ach, TEXT("Ref = %ld, Lines\r\n"), m_cRef+1);

OutputDebugString(ach);

#endif

return ++m_cRef;

}

STDMETHODIMP_(ULONG)

CLines::Release(void)

{

#ifdef _DEBUG

TCHAR ach[50];

wsprintf(ach, TEXT("Ref = %ld, Lines\r\n"), m_cRef-1);

OutputDebugString(ach);

#endif

if(--m_cRef == 0)

{

delete this;

return 0;

}

return m_cRef;

}

* CLines::GetTypeInfoCount

* Purpose:

* Implements IDispatch::GetTypeInfoCount.

STDMETHODIMP

CLines::GetTypeInfoCount(UINT FAR* pctinfo)

{

*pctinfo = 1;

return NOERROR;

}

* CLines::GetTypeInfo

* Purpose:

* Implements IDispatch::GetTypeInfo.

STDMETHODIMP

CLines::GetTypeInfo(

UINT itinfo,

LCID lcid,

ITypeInfo FAR* FAR* pptinfo)

{

*pptinfo = NULL;

if(itinfo != 0)

return ResultFromScode(DISP_E_BADINDEX);

m_ptinfo->AddRef();

*pptinfo = m_ptinfo;

return NOERROR;

}

* CLines::GetIDsOfNames

* Purpose:

* Implements IDispatch::GetIDsOfNames. The standard implementation, DispGetIDsOfNames,

* is used.

STDMETHODIMP

CLines::GetIDsOfNames(

REFIID riid,

OLECHAR FAR* FAR* rgszNames,

UINT cNames,

LCID lcid,

DISPID FAR* rgdispid)

{

return DispGetIDsOfNames(m_ptinfo, rgszNames, cNames, rgdispid);

}

* CLines::Invoke

* Purpose:

* Implements IDispatch::Invoke. The standard implementation, DispInvoke,

* is used. Properties and methods exposed by the lines collection object will

* set m_bRaiseException to raise an exception.

STDMETHODIMP

CLines::Invoke(

DISPID dispidMember,

REFIID riid,

LCID lcid,

WORD wFlags,

DISPPARAMS FAR* pdispparams,

VARIANT FAR* pvarResult,

EXCEPINFO FAR* pexcepinfo,

UINT FAR* puArgErr)

{

HRESULT hr;

m_bRaiseException = FALSE;

hr = DispInvoke(

this, m_ptinfo,

dispidMember, wFlags, pdispparams,

pvarResult, pexcepinfo, puArgErr);

if (m_bRaiseException)

{

if (NULL != pexcepinfo)

_fmemcpy(pexcepinfo, &m_excepinfo, sizeof(EXCEPINFO));

return ResultFromScode(DISP_E_EXCEPTION);

}

else return hr;

}

* Properties and methods exposed through automation.

* CLines::Add

* Purpose:

* Adds a line to the lines collection.

* Parameters:

* pLineNew IDispatch of line to be added to collection.

STDMETHODIMP

CLines::Add(ILine FAR* pLineNew)

{

HRESULT hr;

LONG l;

CLine FAR* pLine = NULL;

VARIANT v;

HDC hdc;

// Is the collection full?

if (m_cElements == m_cMax)

return RaiseException(IDS_CollectionFull);

hr = pLineNew->QueryInterface(IID_ILine, (void FAR* FAR*)&pLine);

if (FAILED(hr))

return RaiseException(IDS_LineFromOtherInstance);

// Add end points of line to the pane's point collection

if (FALSE == pLine->AddEndPointsToPane(m_pPane))

{hr = RaiseException(IDS_CantAddEndPoints); goto error;}

// Add new line to collection

l = m_lLBound+m_cElements;

VariantInit(&v);

V_VT(&v) = VT_DISPATCH;

V_DISPATCH(&v) = pLineNew;

hr = SafeArrayPutElement(m_psa, &l, &v);

if (FAILED(hr))

{hr = RaiseException(IDS_Unexpected); goto error;}

m_cElements++;

// Draw the new line

hdc = m_pPane->GetDC();

pLine->Draw(hdc);

m_pPane->ReleaseDC(hdc);

pLine->Release();

return NOERROR;

error:

if (pLine)

pLine->Release();

return hr;

}

* CLines::get_Count

* Purpose:

* Returns number of items in collection.

STDMETHODIMP

CLines::get_Count(long FAR* lCount)

{

*lCount = m_cElements;

return NOERROR;

}

* CLines::get_Item

* Purpose:

* Retrieves item from collection, given an index.

* Parameters:

* lIndex Index of item to be retrieved.

* ppLine Returns IDispatch of item retrieved from collection.

STDMETHODIMP

CLines::get_Item(long lIndex, ILine FAR* FAR* ppLine)

{

HRESULT hr;

VARIANT v;

// Check if index is within range

if (lIndex < m_lLBound || lIndex >= (long)(m_lLBound+m_cElements))

return RaiseException(IDS_InvalidIndex);

// Retrieve and return item. Note that SafeArrayGetElement AddRefs, so an additional AddRef

// is not required.

VariantInit(&v);

hr = SafeArrayGetElement(m_psa, &lIndex, &v);

if (FAILED(hr))

return RaiseException(IDS_Unexpected);

*ppLine = (ILine FAR*) V_DISPATCH(&v);

return NOERROR;

}

* CLines::get_NewEnum

* Purpose:

* Returns an enumerator (IEnumVARIANT) for the items curently in the collection.

* The NewEnum property is restricted and so is invisible to users of an

* automation controller's scripting language. Automation controllers that support

* a 'For Each' statement to iterate through the elements of a collection will use

* the enumerator returned by NewEnum. The enumerator creates a snapshot of the

* the current state of the collection.

STDMETHODIMP

CLines::get__NewEnum(IUnknown FAR* FAR* ppunkEnum)

{

CEnumVariant FAR* penum = NULL;;

HRESULT hr;

*ppunkEnum = NULL;

// Create new enumerator for items currently in collection and QI for IUnknown

hr = CEnumVariant::Create(m_psa, m_cElements, &penum);

if (FAILED(hr))

{hr = RaiseException(IDS_OutOfMemory); goto error;}

hr = penum->QueryInterface(IID_IUnknown, (VOID FAR* FAR*)ppunkEnum);

if (FAILED(hr))

{hr = RaiseException(IDS_Unexpected); goto error;}

return NOERROR;

error:

if (penum)

delete penum;

return hr;

}

* CLines::Remove

* Purpose:

* Removes specified item from collection.

* Parameters:

* lIndex Index of item to be removed.

STDMETHODIMP

CLines::Remove(long lIndex)

{

HRESULT hr;

long l;

VARIANT HUGEP *pvar;

CLine FAR* pLine = NULL;

RECT rc;

// Check if integer index is within range.

if (lIndex < m_lLBound || lIndex >= (long)(m_lLBound+m_cElements))

return RaiseException(IDS_InvalidIndex);

hr = SafeArrayAccessData(m_psa, (void HUGEP* FAR*)&pvar);

if (FAILED(hr))

return RaiseException(IDS_Unexpected);

V_DISPATCH(&pvar[lIndex-m_lLBound])->QueryInterface(IID_ILine, (void FAR* FAR*)&pLine);

// Ask the pane to invalidate the area where the line is drawn.

pLine->GetInvalidateRect(&rc);

m_pPane->InvalidateRect(&rc);

// Remove end points of line from the pane's point collection.

pLine->RemoveEndPointsFromPane(m_pPane);

// Remove Line

V_DISPATCH(&pvar[lIndex-m_lLBound])->Release();

// Move up the array elements, after the element to be removed.

for (l=lIndex-m_lLBound; l<(long)(m_cElements-1); l++)

pvar[l] = pvar[l+1];

// Remove last element.

V_VT(&pvar[l]) = VT_EMPTY;

pLine->Release();

hr = SafeArrayUnaccessData(m_psa);

if (FAILED(hr))

return RaiseException(IDS_Unexpected);

m_cElements--;

m_pPane->Update(); // Ask the pane to repaint invalidated areas caused by removal of line.

return NOERROR;

}

* The following methods are not exposed through Automation

* CLines::Draw

* Purpose:

* Draws all lines in collection.

STDMETHODIMP_(void)

CLines::Draw(HDC hdc)

{

HRESULT hr;

long l;

CLine FAR* pLine = NULL;

VARIANT HUGEP *pvar;

// Draw each line in the Lines collection

hr = SafeArrayAccessData(m_psa, (void HUGEP* FAR*)&pvar);

if (FAILED(hr))

return;

for (l=0; l<(long)m_cElements; l++)

{

hr = V_DISPATCH(&pvar[l])->QueryInterface(IID_ILine, (void FAR* FAR*)&pLine);

if (FAILED(hr))

continue;

pLine->Draw(hdc);

pLine->Release();

}

hr = SafeArrayUnaccessData(m_psa);

if (FAILED(hr))

return;

}

* CLines::Clear

* Purpose:

* Removes all items from collection.

STDMETHODIMP_(void)

CLines::Clear(void)

{

SafeArrayDestroyData(m_psa);

SafeArrayAllocData(m_psa);

m_cElements = 0;

}

* CLines::RaiseException

* Purpose:

* Fills the EXCEPINFO structure and signal IDispatch::Invoke to return DISP_E_EXCEPTION.

* Sets ErrorInfo object for vtable-binding controllers.

STDMETHODIMP

CLines::RaiseException(int nID)

{

extern SCODE g_scodes[];

TCHAR szError[STR_LEN];

ICreateErrorInfo *pcerrinfo;

IErrorInfo *perrinfo;

HRESULT hr;

_fmemset(&m_excepinfo, 0, sizeof(EXCEPINFO));

m_excepinfo.wCode = nID;

if (LoadString(g_pApplication->m_hinst, nID, szError, sizeof(szError)))

m_excepinfo.bstrDescription = SysAllocString(TO_OLE_STRING(szError));

m_excepinfo.bstrSource = SysAllocString(g_pApplication->m_bstrProgID);

m_bRaiseException = TRUE;

// Set ErrInfo object so that vtable binding containers can get

// rich error information.

hr = CreateErrorInfo(&pcerrinfo);

if (SUCCEEDED(hr))

{

pcerrinfo->SetGUID(IID_ILines);

if (m_excepinfo.bstrSource)

pcerrinfo->SetSource(m_excepinfo.bstrSource);

if (m_excepinfo.bstrDescription)

pcerrinfo->SetDescription(m_excepinfo.bstrDescription);

hr = pcerrinfo->QueryInterface(IID_IErrorInfo, (LPVOID FAR*) &perrinfo);

if (SUCCEEDED(hr))

{

SetErrorInfo(0, perrinfo);

perrinfo->Release();

}

pcerrinfo->Release();

}

return ResultFromScode(g_scodes[nID-1001]);

}

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