Re: VS2005 : Managed Wrapper for Unmanaged code : Ellipsis dilema

On Oct 17, 9:43 am, "Olivier Matrot"
<olivier.matrot....@xxxxxxxxxxxxx> wrote:
Hello,
I'm in the process of writing a managed wrapper on legacy C++ code.
I have to deal with methods that are using the ellipsis.

For instance,the legacy method is :
void CLog::Print (LPCSTR szMask, ...)
{

CHAR szText[512];

va_list arglist;

va_start (arglist, szMask);

wvsprintfA (szText, szMask, arglist);

va_end (arglist);

}

The wrapper looks like this :
void Print(System::String ^ Text, array<Object^>^ args )

{

CStringA s((LPCTSTR)UnmanagedString(Text));

m_pLog->Print(s, args);

Here, you are passing an array<Object^>^ as the 1st ellipsis argument,
while the native part (eg, wvsprintf) expects an int. It not a
surprise it doesn't work..

I do not see any simple solution. IMHO, you should anyway get way of
those ugly, type-unsafe- c-styleish, ellipsis. You could for example
design your wrapper class to work like a stream or a StringBuilder.

Arnaud

.

Relevant Pages