Windows applications in both C++ and C# require certain items added to their app manifests to allow them to properly share their screens.

In a C++ application inside the VCXProj file you will need to add an application manifest xml file. In a C# application you will need to add a app.manifest file. In both cases ensure the following xml is added to it:

to enable High DPI awareness per monitor - which is required for screen sharing on Windows:

<application xmlns="urn:schemas-microsoft-com:asm.v3">
      <dpiAware xmlns="">
</dpiAware>   </windowsSettings> </application>

and to ensure that the compatibility mode is set:

<compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
            <!-- Windows 10 -->
            <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
            <!-- Windows 8.1 -->
            <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}"/>
            <!-- Windows 7 -->
            <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}"/>
            <!-- Windows 8 -->
            <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/>


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