c#下使用directx11截图

Question

我在c#中使用directx11进行截图，但是最终我在span中只得到0，不知道为什么，中间没有错误并且执行返回0，代码使用silk.net. direct3d11 库

我还尝试过创建一个中间Texture2D，然后将我的desktopTexture复制到这个中间Texture2D，然后从中间Texture2D复制到stagingResource

//....
        ID3D11Device* device=null;
        ID3D11DeviceContext* context=null;
        D3DFeatureLevel featureLevel=D3DFeatureLevel.Level101;
        D3DFeatureLevel[] featureLevels =
        [
            D3DFeatureLevel.Level111, D3DFeatureLevel.Level110, D3DFeatureLevel.Level101,D3DFeatureLevel.Level100
        ];
        fixed (D3DFeatureLevel* pFeatureLevels = &featureLevels[0])
        {
            D3D11 d3D11 = new D3D11(new DefaultNativeContext("d3d11"));
            if (d3D11.CreateDevice((IDXGIAdapter*)adapter1, D3DDriverType.Unknown, IntPtr.Zero,
                    (uint)CreateDeviceFlag.None,pFeatureLevels,(uint)featureLevels.Length, D3D11.SdkVersion, ref device,
&featureLevel, ref context)!=0){/*..*/}
        }
        ID3D11DeviceContext* immediateContext = null;
        device->GetImmediateContext(ref immediateContext);
        IDXGIOutputDuplication *outputDuplication = null;
        if (output5.DuplicateOutput((IUnknown*)device, ref outputDuplication)!=0){/*..*/}
        OutduplFrameInfo outduplFrameInfo = new OutduplFrameInfo();
        IDXGIResource* desktopResource = null;
        if (outputDuplication->AcquireNextFrame(1000, &outduplFrameInfo, &desktopResource)!=0{/*..*/}
        if (desktopResource->QueryInterface<ID3D11Resource>(out var desktopTexture)!=0){/*..*/}
        Texture2DDesc stagingTextureDesc = new()
        {
            CPUAccessFlags = (uint)CpuAccessFlag.Read,
            BindFlags = (uint)(BindFlag.None),
            Format = Format.FormatB8G8R8A8Unorm,
            Width = (uint)desc.DesktopCoordinates.Size.X,
            Height = (uint)desc.DesktopCoordinates.Size.Y,
            MiscFlags = (uint)ResourceMiscFlag.None,
            MipLevels = 1,
            ArraySize = 1,
            SampleDesc = { Count = 1, Quality = 0 },
            Usage = Usage.Staging
        };
        ID3D11Texture2D* stagingTexture = null;
        if (device->CreateTexture2D(&stagingTextureDesc,null,ref stagingTexture )!=0){/*..*/}
        stagingTexture->QueryInterface<ID3D11Resource>(out var stagingResource);
immediateContext->CopyResource(stagingResource, desktopTexture);
        MappedSubresource mappedSubresource=new MappedSubresource();
        if (immediateContext->Map(stagingResource, 0, Map.Read, 0, &mappedSubresource)!=0){/*..*/}
        var span = new ReadOnlySpan<byte>(mappedSubresource.PData,
            (int)mappedSubresource.DepthPitch);

我做错了什么？

Answer 1

AcquireNextFrame

不承诺立即给您截图。在纹理准备好之前，您可能需要调用它几次。

在此答案中查看更多内容：AcquireNextFrame 不起作用（桌面复制 API 和 D3D11）。