How to import a given COM interface in VS.NET?

[Lloyd Dupont]

I'am using C# and I would like to use the INLangFontLink interface:
http://msdn.microsoft.com/library/d...ence/ifaces/imlangfontlink/imlangfontlink.asp

I tryed to add a COM interface reference to the project but the add
reference dialog box didn't show me this COM interface.
How could I do that?

I'm also trying to do it in C++ but I know nothing of COM and I'm unsure of
how to instantiate / delete it.

 

[Marcus Heege]

Have you tried to use TIBIMP.EXE?
Have you tries addin COM Refeenecs?

I yes and it didn't help, you will have to write the interface yourself
with attributes like

using namespace System;
using namespace System:::Runtime::InteropServices;
[System::Guid("......")]
[InterfaceType(ComInterfaceType::InterfaceIsIUnknown)]
public interface ... {
};

Marcus Heege

 

[Marcus Heege]

And by the way, if you are using C++/CLI it is much better to just include
the header and call the interface via IJW. IJW is much better here, because
you don't have to care about the Com Callable Wrapper's additional reference
count and it is faster.

Marcus Heege

 

[Lloyd Dupont]

And by the way, if you are using C++/CLI it is much better to just include

the header and call the interface via IJW. IJW is much better here,
because you don't have to care about the Com Callable Wrapper's additional
reference count and it is faster.

uh?... what IJW?
Anyway it's what I probably did as I just include the header and call the
"method".
but I am not sure what I should do about CoInitialize() (and particularly
CoUnitialize)
and I though of C# as I have no idea how to use "the COM beast", whereas I
know how
to use a C# class.

Anyway now it's better... it compile but doesn't link.
I should include some (yet unknown) library to include the symbol:
CoCreateInstance()

 

[Lloyd Dupont]

BTW, what do you think?
I linked with OLE32.LIB and it compiles and linked successfully.

and here is my (short COM) code (so far), does it seems allright to you?
====================================
FontFallback::FontFallback()
{
IMLangFontLink2* pfl;
HRESULT result = CoCreateInstance(
CLSID_CMultiLanguage,
NULL, CLSCTX_ALL,
IID_IMLangFontLink2,
(void**)&pfl);
if(!SUCCEEDED(result))
throw Script::ErrorResult(result);
langfont = pfl;
}
FontFallback::~FontFallback()
{
if( langfont )
langfont->Release();
langfont = NULL;
}
GdiFont^ FontFallback::GetFont(GdiGraphics^ g, wchar_t c)
{
if( !langfont )
throw gcnew ObjectDisposedException("langfont");
if( !g )
throw gcnew ArgumentNullException("g");

DWORD codePages;
HRESULT result = langfont->GetCharCodePages(c, &codePages);
if(!SUCCEEDED(result))
throw Script::ErrorResult(result);

HFONT dest;
result = langfont->MapFont(g->HDC, codePages, c, &dest);
if(!SUCCEEDED(result))
throw Script::ErrorResult(result);
try
{
LOGFONT logfont;
::GetObject(dest, sizeof(LOGFONT), &logfont);
return gcnew GdiFont(&logfont);
}
finally { langfont->ReleaseFont(dest); }
}

 

[Marcus Heege]

Looks good at the first view.

Marcus Heege



BTW, what do you think?
I linked with OLE32.LIB and it compiles and linked successfully.

and here is my (short COM) code (so far), does it seems allright to you?
====================================
FontFallback::FontFallback()
{
IMLangFontLink2* pfl;
HRESULT result = CoCreateInstance(
CLSID_CMultiLanguage,
NULL, CLSCTX_ALL,
IID_IMLangFontLink2,
(void**)&pfl);
if(!SUCCEEDED(result))
throw Script::ErrorResult(result);
langfont = pfl;
}
FontFallback::~FontFallback()
{
if( langfont )
langfont->Release();
langfont = NULL;
}
GdiFont^ FontFallback::GetFont(GdiGraphics^ g, wchar_t c)
{
if( !langfont )
throw gcnew ObjectDisposedException("langfont");
if( !g )
throw gcnew ArgumentNullException("g");

DWORD codePages;
HRESULT result = langfont->GetCharCodePages(c, &codePages);
if(!SUCCEEDED(result))
throw Script::ErrorResult(result);

HFONT dest;
result = langfont->MapFont(g->HDC, codePages, c, &dest);
if(!SUCCEEDED(result))
throw Script::ErrorResult(result);
try
{
LOGFONT logfont;
::GetObject(dest, sizeof(LOGFONT), &logfont);
return gcnew GdiFont(&logfont);
}
finally { langfont->ReleaseFont(dest); }
}