How to use CppWinRT 3.0 for C++ dll project

[zhuxb711]

I have a C++ dll project which provide the context menu to Windows which do not have the .idl file because it's not a .winmd project.

I introduce the CppWinRT because I need to access the MSIX resource using WinRT API, for example, access the locale string through Windows.ApplicationModel.Resources

#include <winrt/Windows.ApplicationModel.h>
#include <winrt/Windows.ApplicationModel.Resources.Core.h>

In CppWinRT 2.0, it works fine. I include the header in pch.h and use them as expected. However, once switch to CppWinRT 3.0, I could never get it works because seems that import winrt.Windows.ApplicationModel is not working because CppWinRT would not generate the *.ixx files for me.

I have already config the project properly as the guidance

<PropertyGroup>
  <CppWinRTBuildModule>true</CppWinRTBuildModule>
</PropertyGroup>
<ClCompile>
  <BuildStlModules>true</BuildStlModules>
</ClCompile>

To implement the context menu, my project looks like this

struct __declspec(uuid("<UUID Here>")) MyContextMenu : public RuntimeClass<RuntimeClassFlags<ClassicCom | InhibitFtmBase>, IExplorerCommand>
{
public:
    IFACEMETHODIMP Invoke(IShellItemArray* psiItemArray, IBindCtx* pBindContext) override;
    IFACEMETHODIMP GetIcon(IShellItemArray* psiItemArray, LPWSTR* ppszIcon) override;
    IFACEMETHODIMP GetFlags(EXPCMDFLAGS* pFlags) override;
    IFACEMETHODIMP GetTitle(IShellItemArray* psiItemArray, LPWSTR* ppszName) override;
    IFACEMETHODIMP GetToolTip(IShellItemArray* psiItemArray, LPWSTR* ppszInfoTip) override;
    IFACEMETHODIMP GetState(IShellItemArray* psiItemArray, BOOL fOkToBeSlow, EXPCMDSTATE* pCmdState) override;
    IFACEMETHODIMP GetCanonicalName(GUID* pguidCommandName) override;
    IFACEMETHODIMP EnumSubCommands(IEnumExplorerCommand** ppEnum) override;
}

Could anyone tell me how to migrate to CppWinRT 3.0 ?

[YexuanXiao]

You should try cleaning the project cache, because the generation of ixx files occurs in the early stage of the build.