如何在C ++ / Winrt UWP应用程序中使用SVG图像？

Question

I have been able to programmatically display bitmap images using C++/WinRT in my UWP applications, however I can't get SVG images to work.

Below is the most simple example I could come up with. I create an application, I load an SVG image, I add it to the application window and activate the window. I have provided the source code and the SVG file below.

A few notes:

• The application runs, it's just that no image is displayed
• I made sure the SVG file is compliant with supported features in Windows
• The file is in my project root folder
• Loading bitmaps in a similar way works without problems
• I have tried to troubleshoot using the OpenFailed method, but the info it gives is useless

---

source

#include "pch.h"


using namespace winrt;
using namespace winrt::Windows::ApplicationModel::Activation;
using namespace winrt::Windows::Foundation;
using namespace winrt::Windows::UI::Xaml;
using namespace winrt::Windows::UI::Xaml::Controls;
using namespace winrt::Windows::UI::Xaml::Media::Imaging;


struct App : ApplicationT<App>
{
    Image mImage;

    void OnLaunched(LaunchActivatedEventArgs const &)
    {
        //Load PNG image - WORKS
        //mImage.Source(BitmapImage(Uri(L"ms-appx:///sample.png")));

        //Load SVG image - FAILS
        mImage.Source(SvgImageSource(Uri(L"ms-appx:///sample.svg")));

        //Show image on screen
        Window window = Window::Current();
        window.Content(mImage);
        window.Activate();
    }

    static void Init(ApplicationInitializationCallbackParams const &)
    {
        make<App>();
    }
};

int WINAPI wWinMain(HINSTANCE, HINSTANCE, PWSTR, int)
{
    Application::Start(App::Init);
}

---

sample.svg

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">

<svg width="100" height="100" version="1.1" xmlns="http://www.w3.org/2000/svg">
  <circle cx="50" cy="50" r="50"/>
</svg>

Answer 1

The problem is not in your code, but in the fact that the file is not copied with the app content.

Click on the sample.svg file in the Solution Explorer and look into the Properties toolbar. You will see Content set as False . You need to set it to True so that the file is copied into the output folder along with other content files like images (those are Content by default, so that is why you don't have to do this).