Questions tagged [c++-winrt]
C++/WinRT is a standard, native C++17 language projection for the Windows Runtime using modern C++ guidelines. It is the preferred alternative to C++/CX and WRL. This tag should be used with questions concerning using the features and functionality of C++/WinRT. Add the appropriate tag for the application type such as UWP as well. C++/WinRT is not C++/CX nor WRL so questions regarding those should probably not use this tag.
748
questions
31
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What is C++/WinRT exactly?
I have been searching around the web. I get that:
C++/WinRT is provided as a standard C++17 header file library
But what is it really? Is it a new Object oriented replacement for the age-old Win32 ...
- 546
14
votes
2
answers
3k
views
Can C++/CX and C++/WinRT be used in the same project?
Earlier this week, Kenny Kerr presented C++/WinRT at CppCon 20161. It is a Standard C++ projection for the Windows Runtime, based on Modern.
As far as I understand, the C++/CX compiler/preprocessor/...
- 49.5k
10
votes
1
answer
434
views
Is there a way of getting ConnectionStatus from IVpnProfile in a UWP application?
I have the following WinRT code which works fine to discover active VPN Profiles:
VpnManagementAgent vpn;
auto profiles = vpn.GetProfilesAsync().get();
wprintf(L"Found %d profiles\n", profiles.Size())...
- 798
9
votes
1
answer
936
views
Can C++ coroutines contain plain `return` statements?
I am writing a C++ coroutine for a UWP control using C++/WinRT:
winrt::fire_and_forget MyControl::DoSomething()
{
if (/* some condition */)
{
// Why does this work?!
return;
...
- 5,506
9
votes
1
answer
2k
views
Any recommendation in using smart pointers for COM-lite objects in C++/WinRT component? [closed]
C++/WinRT provides 3 flavors of smart pointers to use for COM objects - Microsoft::WRL::ComPtr, com_ptr, and ATL-based CComPtr.
In my case, it is a COM-lite object, meaning it is NOT an in-proc or out-...
- 400
8
votes
2
answers
3k
views
C++/WinRT, part of Windows SDK 17134 is not compatible with Visual Studio 15.8 Preview 3
Trying to compile the following code:
#include <winrt/base.h>
int main() {}
With the following compiler options:
/permissive- /std:c++latest
With recently released Visual Studio 15.8 ...
8
votes
0
answers
679
views
Using C++/WinRT dll in WPF with elevated rights application
I have got WPF c# server application (WCF) and want to use c++/WinRT dynamic library inside it. I can simply do this by using UWP desktop bridge with WPF app and UWP empty app that includes my dll. ...
- 4,100
8
votes
1
answer
2k
views
Build Qt project with MinGW to use WinRT APIs
I would like to use libraries available via WinRT API (like these) from my application created using Qt 5.9.2 MinGW 32bit. I got Windows 10 OS.
Now, I have set up a kit as presented below.
Then, in ....
7
votes
0
answers
708
views
Windows Hello IR Camera - How to Modify the Current Mode of the InfraredTorchControl with C++/WinRT Media Foundation Platform APIs
Test Environment
OS: Windows 11 Home 22H2
IR Camera: NexiGo HelloCam N930W Camera
IDE: Visual Studio 2202
programming language: C++ 20
Application Kinds: Windows Desktop Application (C++/Winrt) [not ...
6
votes
1
answer
3k
views
Getting "a function that returns 'auto' cannot be used before it is defined" while using CoreDispatcher::RunAsync in C++/WinRT project
In my C++/WinRT project, I am trying to run some code on UI thread but getting an error that says:
"winrt::impl::consume_Windows_UI_Core_ICoreDispatcher<winrt::Windows::UI::Core::ICoreDispatcher&...
- 63
6
votes
1
answer
2k
views
co_await expression needs await_ready function
I have a Win32 programm, where I want to add some winRT calls. Among other things I want to open a file without a GUI interface.
I use the async file open call from the StorageFile class, because ...
- 1,284
6
votes
1
answer
1k
views
How to create a XAML custom control in code?
I am trying to implement a custom XAML control in code, using C++/WinRT. My attempted implementation, however, failed to compile. As a prove of concept I was using this code:
#pragma once
#include &...
- 49.5k
6
votes
1
answer
2k
views
How to use the Windows Runtime to implement a C++ API using C#?
I'm working with a native C++ app which has a plugin system where it will LoadLibrary()/GetProcAddress() on a .dll to call functions. I'd like to implement one of these plugins, and inside the plugin ...
- 23.1k
6
votes
0
answers
4k
views
Guides for using WinUI with C++ [closed]
I'll try to summarize my issue as concisely as I can:
I have a legacy C++ project that uses WinAPI to create and manage UI elements. I want to replace this with a more modern framework that supports ...
- 165
5
votes
3
answers
1k
views
How can I figure out the class name from an interface ID (IID) in WinRT?
I have a XAML C++/WinRT application based on the BlankApp template. As I built up the app, I realized that my application is throwing a lot of exceptions behind the scenes in my output window. The ...
- 845
5
votes
2
answers
1k
views
C++/winRT xaml ContentDialog example
The documentation shows this C# snippet:
async void DisplayDeleteFileDialog(){
ContentDialog deleteFileDialog = new ContentDialog{
Title = "Delete file permanently?",
Content = "...
- 67
5
votes
2
answers
2k
views
How to add a new XAML "Page", and its associated code-behind files, in C++/WinRT in Visual Studio?
There are various related questions that give a hint how to add a new XAML Page properly to a WinRT/C++ project in Visual Studio, but none are specific to C++/WinRT. (I.e, here, here, and here.)
...
- 13.8k
5
votes
2
answers
5k
views
How do you create a classic win32 application window with WinRT?
What's the C++ WinRT equivalent for what in the Win32 API would be registering a window class, creating a window and then keeping it alive via a message pump loop?
I'm currently looking at and ...
- 629
5
votes
1
answer
2k
views
Can I use C++/WinRT in a non-UWP application?
I just heard about C++/WinRT and I'm surprised that C++ has this runtime which adds high-level class wrappers like .NET does. But I don't want to distribute my apps as UWP apps. Can I use C++/WinRT in ...
- 53
5
votes
1
answer
5k
views
C++11 threads to update MFC application windows. SendMessage(), PostMessage() required?
After spending a bit of time with simple UWP applications with C++/CX and ++/WinRT I have begun to enjoy some of the features of targeting that environment for Windows UI app development.
Now having ...
- 17k
5
votes
1
answer
2k
views
Consuming C++/WinRT Components from C#
I have a project (dynamic library) written in C++/CX, this project is consumed by a Windows 10 Universal App written in C# (targeting x86 and ARM32).
I want to rewrite the library to C++/WinRT in ...
- 309
5
votes
2
answers
2k
views
Correct way to use multiple .IDL (MIDL) files within a single "Windows Runtime Component C++/WinRT" project
Visual Studio 2019. Windows Runtime Component C++/WinRT project.
How do I follow and implement the recommendation: "We recommend that you declare each runtime class in its own Interface Definition ...
- 140
5
votes
2
answers
240
views
Fast way to retrieve file sizes in a folder in UWP
I want to sum all file sizes in my application's TempState folder using below code which works fine.
const auto tempFolder { ApplicationData::Current().TemporaryFolder() };
int64_t size { 0 };
const ...
- 4,955
5
votes
0
answers
1k
views
In which cases can CreateProcess be used on UWP?
I've noticed that CreateProcess is part of the Universal Windows Platform API since version 16299.
To test it, I've made a quick UWP app based on the Blank App template (C++/WinRT) and wired up a ...
- 165
4
votes
3
answers
5k
views
Error: this template attempted to load component assembly 'Microsoft.VisualStudio.Universal.TemplateWizards, Version=15.0.0.0
I'm using Visual Studio Community 2017 Version 15.7.1 on Windows 10 Home Version 10.0.16299 32-bit, Windows SDK Version 10.0.17134.12 and C++/WinRT Version 1.0.180505.2. When I try to create a new ...
- 7,694
4
votes
1
answer
2k
views
Build Qt project with VS C++ Compiler 15.0 with C++17 to use WinRT APIs
I would like to use libraries available via WinRT API (like these) from my UWP application created using Qt 5.9.2 for UWP 64bit (MSVC 2017). I got Visual Studio Build Tool 2017 v15.5.7 installed on my ...
4
votes
2
answers
957
views
Error C2664 'HRESULT IUnknown::QueryInterface(const IID &,void **)': cannot convert argument 1 from 'const winrt::guid' to 'const IID &'
This error happens to me when I use the helper function from microsoft docs to migrate to winrt from cx. I see a similar question here, but the solution mentioned doesn't seem to work for me. The ...
- 2,671
4
votes
1
answer
2k
views
How could I know if I'm developing a c++/cx or c++/WinRT UWP application?
I'm creating a c++ UWP application and I want this app to be c++/WinRT because I read that c++/cx is not supported anymore.
And this is how I created my application.
VS 2017 -> File -> New -> Project.....
- 155
4
votes
3
answers
1k
views
WinUI3/Desktop/C++: Can't compile winrt::resume_foreground(Microsoft::System::DispatcherQueue const& dispatcher)
I want to use:
co_await winrt::resume_foreground(window.DispatcherQueue());
(Type of "window" is: "winrt::Microsoft::UI::Xaml::Window")
But I cannot compile it because
winrt::...
- 51
4
votes
3
answers
6k
views
VS 2017 & 2019 cannot find the WinRT header files, even on a fresh solution
So I'm trying to update a Win32 application to UWP using a "Windows Application Packaging Project", I'm hitting filesystem issues, which I expected and am trying to resolve them. In order to ...
- 518
4
votes
2
answers
760
views
How do I display a C++/WinRT FileOpenPicker from an exe without a console or window?
From a C++ executable on windows, I want to display a FileOpenPicker.
To do this, I need a window to set as the object's owner:
https://learn.microsoft.com/en-us/windows/apps/develop/ui-input/display-...
- 2,784
4
votes
1
answer
1k
views
Consume Windows Runtime APIs from pure C
As far as I understand, Windows Runtime is the new infrastructure through which Windows exposes its APIs. My question is simple: how can I use that from pure C code? I don't mind writing more code, I ...
- 198
3
votes
2
answers
2k
views
Is Win2D yet available in C++/WinRT?
I need to use win2D in my cppwinrt project. Using the Win2D sample file as a model I’ve tried to mimic its setup, putting in the package file for win2d from that project, duplicating the custom build ...
- 201
3
votes
1
answer
1k
views
How to use midlrt.exe to compile .idl to .winmd?
Background: I need to build a Windows Runtime Component as part of a system that's set up to use CMake to generate its build system. As a preparatory step I'm trying to build it on the command line.
...
- 49.5k
3
votes
1
answer
500
views
How to get pixel data out of an IDXGISurface created with GPU access only?
In broad strokes, what I'm trying to accomplish is capture (part of) the screen and transform the capture into a digital image format. The following steps outline what I believe to be the solution:
...
- 49.5k
3
votes
3
answers
2k
views
Does C++/WinRT offer a helper function to construct a GUID from a string literal?
Unlike C++/CX, there doesn't appear to be a wrapper type for GUIDs in C++/WinRT. It just uses the plain C GUID struct as-is. So the only way to construct an initialized GUID is by using aggregate ...
- 49.5k
3
votes
1
answer
1k
views
How to get TypeName of underlying type in in C++/WinRT?
I'm trying to implement the ICustomPropertyProvider::Type() method, however I can't find a way to get TypeName of a C++/WinRT type. Apparently you have Object::GetType and T::typeid in C++/CX, but not ...
- 308
3
votes
1
answer
684
views
Converting the C++/CX "delegate" object over to its equivalent in C++/WinRT
I'm new to WinRT. I'm converting my Windows UWP app written C++/CX over to C++/WinRT. I have a C++/CX ref class that basically does the same thing as the Microsoft.VisualStudio.PlatformUI....
- 116
3
votes
1
answer
4k
views
How can I specify "Target Platform Version" and "Target Platform Min. Version" when compiling with MSBuild, VS 2019, Platform Toolset v142
Project files have these settings in a PropertyGroup named Globals:
<PropertyGroup Label="Globals">
...
<WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
<...
- 167
3
votes
1
answer
855
views
How do i get the Instance of the class when i use winrt::static_lifetime?
I switched from C++/CX to C++/winrt not long ago and I'm currently stuck because I want to create a singleton winrt-class. I read about winrt::static_lifetime (https://learn.microsoft.com/en-us/uwp/...
- 147
3
votes
2
answers
557
views
UWP App cannot pass Certification Kit tests on Windows 11
Edit 2
As @Calphalon points out (really appreciate your efforts with the MS engineer on this matter) in his answer, it's actually caused by a bug when WACK runs on W11.
Edit 1:
Oh no, I ran the ...
- 166
3
votes
1
answer
700
views
How to get the parent of an object in WinUI3 with C++/WinRT?
This is how the xaml looks like:
<ListView HorizontalContentAlignment="Stretch"
x:Name="listViewMessages"
Grid.Column="1"
...
3
votes
1
answer
376
views
What does the option "Fast ABI" do?
I can't find any documentation on this option.
What does it do? Are there disadvantages to it or why is it not used by default?
Edit:
According to this CppWinRT NuGet package readme the C++/WinRT ...
- 33
3
votes
1
answer
387
views
How can one control the number of threads Windows ML is using for evaluation
I'm trying to benchmark Windows ML against other backends and see some weird distribution of inference times (see plot). This is with the CPU backend using the ARM64 architecture. On ARM there's no ...
- 17k
3
votes
2
answers
583
views
Array as value in ValueSet
My goal is to add array of strings as value into ValueSet. I can do it in C# without any problem, but facing some problems in C++-WinRT.
I am trying to pass array_view to box_value in order to ...
- 2,305
3
votes
1
answer
3k
views
How to use multiple precompiled headers; some from a library
I do not think this is unique to my projects, it applies to any C++ library that uses precompiled headers and a project that uses the library that has its own precompiled headers. Its just that C++/...
- 2,375
3
votes
1
answer
2k
views
What is a composable runtime class?
I'm experimenting with creating a simple xaml appilcation using C++/WinRT.
I come from a WPF background where it is pretty common to have a base class
that implements INotifyPropertyChanged and have ...
- 4,065
3
votes
1
answer
901
views
unresolved external for mouse pointer event exit handler for a Rectangle for XAML with C++/WinRT
I am working on a simple C++/WinRT UWP application to learn about how to link XAML events and the C++/WinRT source code for the actual handlers for these events.
I have a XAML source for a simple ...
- 17k