BUG: Multithreaded Tablet PC Applications May Quit Because of Memory Corruption (827638)

RESOLUTION

 // WorkAround.cpp 
 //
    CComPtr<IInkDisp> CreateDummyInk()
{
    // The ISF data for the dummy Ink object must be as follows:
    static const BYTE isf [] = 
    {
	    0x00, 0xCC, 0x01, 0x00, 0x00, 0x00, 0xC0, 0xB8,
	    0x02, 0xB0, 0xEA, 0x01, 0x03, 0xBD, 0x01, 0x48,

	    0x01, 0x49, 0x00, 0x00, 0x00, 0x00, 0x4D, 0x00,
	    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

	    0x00, 0x00, 0x00, 0x55, 0x00, 0x00, 0x00, 0x00,
	    0x38, 0x00, 0x00, 0x34, 0x00, 0x00, 0x00, 0x00,

	    0x3B, 0x00, 0x00, 0x00, 0x00, 0x37, 0x00, 0x00,
	    0x00, 0x00, 0x41, 0x00, 0x00, 0x3F, 0x00, 0x00,

	    0x00, 0x00, 0x33, 0x00, 0x00, 0x00, 0x00, 0x42,
	    0x00, 0x00, 0x54, 0x00, 0x00, 0x00, 0x00, 0x43,

	    0x00, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x4C, 0x00,
	    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

	    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	    0x00, 0x00, 0x00, 0x39, 0x00, 0x00, 0x32, 0x00,

	    0x00, 0x00, 0x00, 0x52, 0x01, 0x08, 0x00, 0x44,
	    0x32, 0x4E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

	    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	    0x00, 0x00, 0x45, 0x32, 0x3D, 0x00, 0x00, 0x00,

	    0x00, 0x40, 0x00, 0x00, 0x47, 0x01, 0x35, 0x00,
	    0x00, 0x00, 0x00, 0x3A, 0x00, 0x00, 0x36, 0x00,

	    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3E,
	    0x00, 0x00, 0x00, 0x00, 0x4F, 0x00, 0x00, 0x46,

	    0x32, 0x57, 0x09, 0x00, 0x00, 0x00, 0x53, 0x00,
	    0x00, 0x00, 0x00, 0x4B, 0x01, 0x08, 0x00, 0x56,

	    0x00, 0x00, 0x00, 0x00, 0x51, 0x32, 0x50, 0x32,
	    0x4A, 0x01, 0x08, 0x00, 0x0A, 0x01, 0x00,

    };

    // The following GUIDs are provided as an example of how to add
    // custom extended property GUIDs into the Ink objects.
    static const GUID guidExtProps [] =
    {
        // {B2B38458-097B-41a1-B5B3-C46345DCB28B}
        { 0xb2b38458, 0x097b, 0x41a1, { 0xb5, 0xb3, 0xc4, 0x63, 0x45, 0xdc, 0xb2, 0x8b } },

        // {D5BABAB9-8FBE-4581-B4F5-379EF8C82E91}
        { 0xd5babab9, 0x8fbe, 0x4581, { 0xb4, 0xf5, 0x37, 0x9e, 0xf8, 0xc8, 0x2e, 0x91 } },
    };

    CComVariant data;
    BYTE *pBuff = NULL;

    // The variant is a one dimensional array of BYTEs.
    data.vt = VT_ARRAY | VT_UI1;
    SAFEARRAYBOUND sab;
    sab.lLbound = 0;
    sab.cElements = sizeof(isf);

    // Allocate memory for the SafeArray.
    data.parray = SafeArrayCreate(VT_UI1, 1, &sab);

    // Copy ISF into the SafeArray.
    SafeArrayAccessData(data.parray, (VOID **)(&pBuff));
    memcpy(pBuff, isf, sizeof(isf));
    SafeArrayUnaccessData(data.parray);

    CComPtr<IInkDisp> spInk;

    // Create an Ink object.
    HRESULT hr = spInk.CoCreateInstance(CLSID_InkDisp);

    // Load the Ink data.
    if(SUCCEEDED(hr))
        	hr = spInk->Load(data);

    CComPtr<IInkDrawingAttributes> spDrawAttrs;
    CComPtr<IInkStrokeDisp> spStroke;
    if(SUCCEEDED(hr))
    {
        	// Get DrawingAttributes object of the first stroke.
        	// You do not have to check for stroke count, because
        	// the ISF above contains one stroke.
        	CComPtr<IInkStrokes> spStrokes;
        	hr = spInk->get_Strokes(&spStrokes);
        	if(SUCCEEDED(hr))
        	{
            		hr = spStrokes->Item(0, &spStroke);
            		if(SUCCEEDED(hr))
            		{			
                // Get the DrawingAttributes object from the stroke.
                			hr = spStroke->get_DrawingAttributes(&spDrawAttrs);
            			}
        		}
    	}

    // Add custom properties to DrawingAttributes object.
    if(SUCCEEDED(hr))
    {
        	// Get the extended properties from DrawingAttributes object.
        	CComPtr<IInkExtendedProperties> spExtProperties;
        	hr = spDrawAttrs->get_ExtendedProperties(&spExtProperties);

        	// Enumerate all the properties in the static array.
        	ULONG cExtPropCount = sizeof(guidExtProps)/sizeof(GUID);

        	// Add enumerated properties to the extended property list.
        	for(ULONG i = 0; SUCCEEDED(hr) && (i < cExtPropCount); ++i)
        	{
            		CComVariant vtData;
            		vtData.vt = VT_UI1 | VT_ARRAY;

            		// The data size for extended properties can differ from 
            		// the actual size that would be used in the application.
            		vtData.parray = SafeArrayCreateVector(VT_UI1, 0, sizeof(DWORD));
            		BYTE * pData = NULL;
            		if(NULL != vtData.parray)
            		{
                			hr = SafeArrayAccessData(vtData.parray, (void **)&pData);
            		}
            		else
                			hr = E_OUTOFMEMORY;
            		if(SUCCEEDED(hr))
            		{
                			memset(pData, 0, sizeof(DWORD));
                			hr = SafeArrayUnaccessData(vtData.parray);
            		}
            		if(SUCCEEDED(hr))
            		{
                			CComPtr<IInkExtendedProperty> spExtProp;
                			hr = spExtProperties->Add(CComBSTR(guidExtProps[i]), vtData, &spExtProp);
            		}
        	}

        	// Add DrawingAttributes back to the stroke object
        	// so that the extended properties stick to the 
        	// DrawingAttributes object.
        	if(SUCCEEDED(hr))
            		hr = spStroke->putref_DrawingAttributes(spDrawAttrs);
    	}

    // If anything went wrong, unref the Ink object.
    if(FAILED(hr))
        		spInk = NULL;

    return spInk;
}