C / C++ / MFC

std::wstring s = L"abc";
s += L'\0'; // put null character after 'c'
s += L"def";

size_t length = s.length(); // now length is 7

wchar_t c;
c = s[2]; // now c is 'c'
c = s[3]; // now c is 0
c = s[4]; // now c is 'd'

const wchar_t * p = s.c_str(); // now p points to array of 8 characters, including final null character.

CComSafeArray< USHORT > sa;
sa.Add(s.length() + 1, (USHORT*)p);

sivaprakashshanmugam wrote:

I have the following prototype in ActiveX to send the Array from my client program. The variable VarArray contains array of values, Can you please provide me an example to get the values of each index by using SafeArray.

//Initialize the bounds for the array<br />
	//Ours is a 2 dimensional array<br />
	SAFEARRAYBOUND safeBound[2]; <br />
	<br />
	//Set up the bounds for the first index<br />
	//That's the number of flavors that we have<br />
	safeBound[0].cElements = m_vecIcecreamFlavors.size();    <br />
	safeBound[0].lLbound = 0;<br />
<br />
	//Set up the bounds for the second index<br />
	safeBound[1].cElements = m_vecIcecreamPrices.size();<br />
	safeBound[1].lLbound = 0 ;<br />
<br />
	<br />
	///Initialize the VARIANT<br />
	VariantInit(VarArray);<br />
	//The array type is VARIANT<br />
	//Storage will accomodate a BSTR and a float<br />
	pVariant->vt = VT_VARIANT | VT_ARRAY; <br />
	pVariant->parray = SafeArrayCreate(VT_VARIANT,2,safeBound);<br />
	<br />
	<br />
	//Initialize the vector iterators<br />
	std::vector<CComBSTR>::iterator iterFlavor;<br />
	std::vector<float>::iterator iterPrices;<br />
<br />
<br />
	<br />
	//Used for indicating indexes in the Multidimensional array<br />
	long lDimension[2];<br />
	int iFlavorIndex = 0;<br />
<br />
	<br />
	//Start iteration<br />
	iterPrices = m_vecIcecreamPrices.begin();<br />
	iterFlavor = m_vecIcecreamFlavors.begin(); <br />
<br />
<br />
	//Iterate thru the list of flavors and prices<br />
	while(iterFlavor != m_vecIcecreamFlavors.end()) <br />
	{<br />
<br />
		<br />
		//Put the Element at (0,0), (0,1)  , (0,2) ,.............(0,n)<br />
		lDimension[1] = iFlavorIndex;<br />
		lDimension[0] = 0;<br />
		CComVariant variantFlavor(SysAllocString((*iterFlavor).m_str));<br />
		SafeArrayPutElement(pVariant->parray,lDimension,&variantFlavor);<br />
<br />
	<br />
		<br />
		//Put the Element at (1,0), (1,1)  , (1,2) ,.............(1,n)<br />
		lDimension[1] = iFlavorIndex;<br />
		lDimension[0] = 1;<br />
		CComVariant variantPrices(*iterPrices);<br />
		SafeArrayPutElement(pVariant->parray,lDimension,&variantPrices);<br />
	<br />
		<br />
		iFlavorIndex++;<br />
		iterPrices++;<br />
		iterFlavor++;<br />
		<br />
<br />
	}

long lUDimension,lLDimension;<br />
    <br />
    SafeArrayGetUBound(result->parray,2,&lUDimension);<br />
    SafeArrayGetLBound(result->parray,2,&lLDimension);<br />
    VARIANT val[2];<br />
    long Dimension[2];<br />
    <br />
    for(LONG i=lLDimension;i<=lUDimension;i++)<br />
    {<br />
        m_Data.InsertItem(i," ");<br />
        Dimension[0]=0;<br />
        Dimension[1]=i;    <br />
        HRESULT hr=SafeArrayGetElement(result->parray,Dimension,(void*)&val[0]);<br />
        if(FAILED(hr))<br />
            AfxMessageBox("Unable to read 1 element");<br />
               m_Data.SetItemText(i,0,_com_util::ConvertBSTRToString(val[0].bstrVal));<br />
        Dimension[0]=1;<br />
        Dimension[1]=i;    <br />
        hr=SafeArrayGetElement(result->parray,Dimension,(void*)&val[1]);<br />
        if(FAILED(hr))<br />
            AfxMessageBox("Unable to read 2 element");<br />
        m_Data.SetItemText(i,1,_com_util::ConvertBSTRToString(val[1].bstrVal));<br />
}

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