GetResult() returns E_ACCESSDENIED use dymanic dll

Question

 I write a dymanic dll for metor style apps and desktop mode used.

And use LoadPackagedLibrary to load a DLL form metro style app.

 Metro Style app Code:
 HINSTANCE LibHandle2;
 LibHandle2 = LoadPackagedLibrary(L"XXX", 0);
 DWORD error = GetLastError();
 POUTPUT p2 = (POUTPUT)GetProcAddress(LibHandle2, "Test");
 int n2 = (*p2)();

 DLL Code:
  ComPtr<ICreateDeviceAccessAsync> access;
  ComPtr<IDeviceIoControl> deviceControl;
  hr = CreateDeviceAccessInstance(L"DevicePath",
         GENERIC_READ | GENERIC_WRITE,
         &access);
  hr = access->Wait(INFINITE);
  THROW_HR(hr);

  hr = access->GetResult(IID_PPV_ARGS(&deviceControl));

It occur E_ACCESSDENIED 0x80070005 General access denied error at hr = access->GetResult(IID_PPV_ARGS(&deviceControl));

I have gone through the BUILD conference video and aware of (1) application manifest, (2) device metadata and (3) privileged interface property.

I have done all that and use MoFX2App (no code change) sample code successfully.

Can we use Win32DLL project  "CreateDeviceAccessInstance and IDeviceIoControl " to communication with the driver?

Answer 1

Hello,

Which the DLL project did you create?

You should use this templates
"Visual C++ -> Windows Metro style -> Blank Dynamic-Link Library" or "Visual C++ -> Windows Metro style -> WinRT Component DLL".

For more information, please check:
http://social.msdn.microsoft.com/Forums/en-US/tailoringappsfordevices/thread/64fad5ed-8248-48ec-9d57-7a9128bc4032

Best regards,
Jesse

---

Jesse Jiang [MSFT]
MSDN Community Support | Feedback to us

Answer 2

I use this templates.

"Visual C++ -> Win32 -> Win32 Project ->DLL

Is it support to  communication with the driver use  "CreateDeviceAccessInstance and IDeviceIoControl" API?

Is it Only "Visual C++ -> Windows Metro style -> Blank Dynamic-Link Library" and "Visual C++ -> Windows Metro style -> WinRT Component DLL"  templates that we can use to communication with the driver?

Answer 3

Hello,

The Win32 template can add the WinRT namespace, you should enable /ZW and disable /GM-, and then include the metadata file into your project.

The template for WinRT Component DLL will be more convenient.

Best regards,
Jesse

---

Jesse Jiang [MSFT]
MSDN Community Support | Feedback to us