C#•3y ago

Capturing images from specific DirectX window

I want to capture images (pretty quickly, so pretty much like a video) from different applications, and some of them are DirectX, so using things like GDI+ won't work. From reading a bit about it, I have found that I apparently can do it by using EasyHook and DLL injection, but hooking and DLL injection make me think about how would that work in videogames? Wouldn't an anticheat ban you for that? Windows.Graphics.Capture seems to work, but I couldn't find a way to get images from it.

17 Replies

ross•3y ago

@V3rzеT Maybe https://docs.microsoft.com/en-us/uwp/api/windows.graphics.capture.graphicscapturesession?view=winrt-22621 ?

GraphicsCaptureSession Class (Windows.Graphics.Capture) - Windows U...

Allows the application to take screen captures.

ross•3y ago

Or https://docs.microsoft.com/en-us/windows/uwp/audio-video-camera/screen-capture#take-a-screenshot

Screen capture - UWP applications

The Windows.Graphics.Capture namespace provides APIs to acquire frames from a display or application window, to create video streams or snapshots to build collaborative and interactive experiences.

VеrsetteOP•3y ago

That's the one that I mentioned worked, but I couldn't find the way to get a single bitmap image from This seems like it should work, thanks, will look into it ^^ Edit: Dumb me thought that they are different things, it's apparently the same namespace and I just couldn't find any examples for doing what I wanted to. The example outputs a CanvasBitmap which is a thingie from the Win2D library, but it's possible to convert into anything else by saving it to a MemoryStream using CanvasBitmap.SaveAsync()

reflectronic•3y ago

you do not even neccessarily need Win2D you could also use SoftwareBitmap.CreateCopyFromSurfaceAsync. if you need to save it as a PNG or something, you would then use BitmapEncoder i mean, it depends on what exactly you want to do with the picture unless you are actually writing a UWP application, it is a minor pain in the ass to actually use Win2D

VеrsetteOP•3y ago

What would I replace _canvasDevice CanvasDevice with in that case?

            _framePool = Direct3D11CaptureFramePool.Create(
               _canvasDevice, // D3D device
               DirectXPixelFormat.B8G8R8A8UIntNormalized, // Pixel format
               2, // Number of frames
               _item.Size); // Size of the buffers

            _framePool = Direct3D11CaptureFramePool.Create(
               _canvasDevice, // D3D device
               DirectXPixelFormat.B8G8R8A8UIntNormalized, // Pixel format
               2, // Number of frames
               _item.Size); // Size of the buffers

Also, is there any way to use this with .NET 6? If I set the target Windows version to the correct one in project settings, some using errors are fixed, but some are not, like IDirect3DDevice I fixed similar problems by adding the Microsoft.Windows.SDK.Contracts nuget package previously, but it doesn't seem to work in this case, as it probably somehow conflicts with me choosing the Windows target OS, and breaks the whole project

reflectronic•3y ago

what error with IDirect3DDevice?

VеrsetteOP•3y ago

reflectronic•3y ago

have you referenced Win2D?

VеrsetteOP•3y ago

Yes

reflectronic•3y ago

which package did you reference exactly

VеrsetteOP•3y ago

https://www.nuget.org/packages/Win2D.uwp/1.26.0/

Win2D.uwp 1.26.0

An easy-to-use Windows Runtime API for immediate mode 2D graphics rendering. For the Universal Windows Platform (Windows 10).

reflectronic•3y ago

yes, that is why that package doesn't work with .NET 6 try using Microsoft.Graphics.Win2D instead it should work, and if it doesn't, you probably have to do that minor pain in the ass thing

VеrsetteOP•3y ago

Breaks stuff :/

VеrsetteOP•3y ago

By you probably have to do that minor pain in the ass thing you mean use SoftwareBitmap?

reflectronic•3y ago

oh, um, yeah, Microsoft.Graphics.Win2D probably wouldn't work either you are going to have to create the device "manually"

VеrsetteOP•3y ago

Aaand, how do I do that? :>

reflectronic•3y ago

my suggestion (untested): - add a reference to https://www.nuget.org/packages/Microsoft.Windows.CsWin32 - in your NativeMethods.txt (the readme explains), add: - CreateDirect3D11DeviceFromDXGIDevice - D3D11CreateDevice - D3D11_SDK_VERSION

unsafe
{
    Marshal.ThrowExceptionForHR(Windows.Win32.PInvoke.D3D11CreateDevice(null,
        Windows.Win32.Graphics.Direct3D.D3D_DRIVER_TYPE.D3D_DRIVER_TYPE_HARDWARE,
        null,
        default,
        default,
        Windows.Win32.PInvoke.D3D11_SDK_VERSION,
        out var device,
        null,
        out _));

    Marshal.ThrowExceptionForHR(Windows.Win32.PInvoke.CreateDirect3D11DeviceFromDXGIDevice(
        (Windows.Win32.Graphics.Dxgi.IDXGIDevice) device,
        out var id3dDevice));

    _device = MarshalGeneric<IDirect3DDevice>.FromAbi(Marshal.GetIUnknownForObject(id3dDevice));

    GC.KeepAlive(id3dDevice);
}

unsafe
{
    Marshal.ThrowExceptionForHR(Windows.Win32.PInvoke.D3D11CreateDevice(null,
        Windows.Win32.Graphics.Direct3D.D3D_DRIVER_TYPE.D3D_DRIVER_TYPE_HARDWARE,
        null,
        default,
        default,
        Windows.Win32.PInvoke.D3D11_SDK_VERSION,
        out var device,
        null,
        out _));

    Marshal.ThrowExceptionForHR(Windows.Win32.PInvoke.CreateDirect3D11DeviceFromDXGIDevice(
        (Windows.Win32.Graphics.Dxgi.IDXGIDevice) device,
        out var id3dDevice));

    _device = MarshalGeneric<IDirect3DDevice>.FromAbi(Marshal.GetIUnknownForObject(id3dDevice));

    GC.KeepAlive(id3dDevice);
}

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Capturing images from specific DirectX window