What to do to access Windows::Foundation::Rect

Question

Basic question from an old-timer C#/WPF turned newbie managed C++.

I created a new C++ / Windows Store / "DLL (Windows Store apps)". I then created a new class. In my new class, I want to access Windows::Foundation::Rect but the compiler does not recognize "Windows".

On the other hand, if I create a C++ / Windows Store / "Blank App (XAML)", Windows::Foundation::Rect is readily accessible without me having to do any extra work.

My question: What do I need to do to get my "DLL (Windows Store apps)" to pick up the Windows::Foundation::Rect (and, in general, whatever namespaces that I need)?

Thanks in advance.

 Here is MyC.h and MyC.cpp.

#pragma once
class MyC
{
public:
    MyC(void);
    ~MyC(void);
};

#include "pch.h"
#include "MyC.h"

MyC::MyC(void)
{
    Windows::Foundation::Rect r;
}

MyC::~MyC(void)
{
}

 

 The compiler outputs:

Error 1 error C2653: 'Windows' : is not a class or namespace name c:\users\tan\documents\visual studio 2012\projects\accessingwinrt\myc.cpp 6 1 AccessingWinRT
Error 2 error C2065: 'Rect' : undeclared identifier c:\users\tan\documents\visual studio 2012\projects\accessingwinrt\myc.cpp 6 1 AccessingWinRT
Error 3 error C2146: syntax error : missing ';' before identifier 'r' c:\users\tan\documents\visual studio 2012\projects\accessingwinrt\myc.cpp 6 1 AccessingWinRT
Error 4 error C2065: 'r' : undeclared identifier c:\users\tan\documents\visual studio 2012\projects\accessingwinrt\myc.cpp 6 1 AccessingWinRT

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PermanentTan

Answer 1

After manually comparing the two project files (DLL vs Blank App), it looks like I need to flip the "Consume Windows Runtime extension" flag (/ZW). It seems to do the trick. Is this the correct way?

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PermanentTan

Answer 2

The /ZW option turns out to be bad for me. My C++ DLL is managed - It is already compiled with /clr. The presence of both /clr and /ZW are not allowed by the compiler. So I am back to square one.

So I essentially want to build a managed C++ DLL where:

1. My C++ code has access to managed functions like gcnew

2. My C++ code also has access to Windows::Foundation::*

Appreciate any help.

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PermanentTan

Answer 3

Managed C++ is not supported for Windows Store apps.

--Rob