Concatenate wchar_t* unicode in C++ for making XLL excel?

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C++

<pre>// Concatenate two wchar_t*
void mergeWChar(wchar_t*& dest, const wchar_t* source) {
	if (dest == nullptr) {
		dest = const_cast<wchar_t*>(source);
		return;
	}

	wchar_t *newdest = (wchar_t*)malloc((wcslen(dest) + wcslen(source) + 1) * sizeof *newdest); //thay + 1 bằng + 0
	wcscpy(newdest, dest);      // the *_s functions are useless here
	wcscat(newdest, source);    // as you know that newdest point to
	// a long enough buffer
	dest = newdest;

}

And then I create a Function and reg it with UB

<pre lang="c++">
<pre>__declspec(dllexport) LPXLOPER12 sorachu(double so)
{
	static XLOPER12  xResult;
	xResult.xltype = xltypeStr;

		
	wchar_t* msg = nullptr;
	wchar_t* wcs = L"Sơn";
	wchar_t* wcs1 = L"Văn";
		
	mergeWChar(msg, wcs);	
	mergeWChar(msg, wcs1);
	
	xResult.val.str = msg;

	return (LPXLOPER12)&xResult;
}

Open Excel
Type "=sorachu(123)"
Result: ơnVăn...........................

What I have tried:

If I change <pre>wchar_t* wcs = L"Sơn";

is

wchar_t* wcs = L"\006Sơn";

then results = Sơn Văn" >>> TRUE

How to change L "\ 006" automatically when the variables wcs or wcs1 change.
Help me, pls.

Posted 5-Sep-19 17:15pm

nguyenvan.son

Updated 5-Sep-19 18:20pm

v2

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3 solutions

Solution 1

I tried this code in VS2017 and it worked correctly. I made only slight changes.

C++

void mergeWChar( wchar_t*& dest, const wchar_t* source )
{
    if( dest == nullptr )
    {
        dest = const_cast<wchar_t*>( source );
        return;
    }

    size_t count = wcslen( dest ) + wcslen( source ) + 1;
    wchar_t * newdest = (wchar_t*)malloc( count * sizeof( wchar_t ) );
    wcscpy( newdest, dest );
    wcscat( newdest, source );

    // a long enough buffer
    dest = newdest;
}

void DoMergeCharTest()
{
    wchar_t* msg = nullptr;
    wchar_t* wcs1 = _T( "Son" );
    wchar_t* wcs2 = _T( "Van" );

    trace( _T( "MergeCharTest : '%s' and '%s'\n" ), wcs1, wcs2 );

    mergeWChar( msg, wcs1 );
    mergeWChar( msg, wcs2 );

    trace( _T( "result is '%s'\n" ), msg );

    free( msg );
}

The output was :

MergeCharTest : 'Son' and 'Van'
result is 'SonVan'

Posted 5-Sep-19 18:04pm

Rick York

Updated 5-Sep-19 18:13pm

v2

Solution 3

My problem is in __declspec(dllexport) LPXLOPER12 sorachu(double so) for XLL Excel.

Posted 5-Sep-19 18:20pm

nguyenvan.son

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nguyenvan.son · Accepted Answer · 2019-09-05T18:11:00

Solution 2

I think that mergeWChar is TRUE and I try it in VS 2013, it is OK (with console).

but It is error when run it in XLL Excel.

PS: "Sơn" not "Son"
(unicode char)

Posted 5-Sep-19 18:11pm

nguyenvan.son

Updated 5-Sep-19 18:18pm

v2