c# – 使用SharpDX和EasyHook捕获全屏DX11程序的截图

在任何人提到之前,我指向 this链接,以了解如何将backbuffer复制到位图.

现在的情况

>我被注入目标进程
>目标进程’FeatureLevel = Level_11_0
>目标SwapChain正在使用dxgi_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH标志.
> SwapChain :: Present函数挂钩.
>屏幕截图显示黑色和目标进程崩溃.没有截图过程运行正常.

期望的情况

使截图正确,让目标进程继续正常执行.

码

注意Hook类与链接中的相同.我只添加了一个UnmodifiableHook版本,它的名称说.我省略了所有不重要的位.

TestSwapChainHook.cs

using System;
using System.Runtime.InteropServices;

namespace Test
{
    public sealed class TestSwapChainHook : Idisposable
    {
        private enum IdxgiSwapChainVirtualTable
        {
            QueryInterface = 0,AddRef = 1,Release = 2,SetPrivateData = 3,SetPrivateDataInterface = 4,GetPrivateData = 5,GetParent = 6,GetDevice = 7,Present = 8,GetBuffer = 9,SetFullscreenState = 10,GetFullscreenState = 11,GetDesc = 12,ResizeBuffers = 13,ResizeTarget = 14,GetContainingOutput = 15,GetFrameStatistics = 16,GetLastPresentCount = 17,}

        public static readonly int VIRTUAL_METHOD_COUNT_LEVEL_DEFAULT = 18;

        private static IntPtr[] SWAP_CHAIN_VIRTUAL_TABLE_ADDRESSES;

        [UnmanagedFunctionPointer(CallingConvention.StdCall,CharSet = CharSet.Unicode,SetLastError = true)]
        public delegate int dxgiSwapChainPresentDelegate(IntPtr thisPtr,uint syncInterval,SharpDX.dxgi.PresentFlags flags);

        public delegate int dxgiSwapChainPresentHookDelegate(UnmodifiableHook<dxgiSwapChainPresentDelegate> hook,IntPtr thisPtr,SharpDX.dxgi.PresentFlags flags);

        private dxgiSwapChainPresentHookDelegate _present;
        private Hook<dxgiSwapChainPresentDelegate> presentHook;

        static TestSwapChainHook()
        {
            SharpDX.dxgi.Rational rational = new SharpDX.dxgi.Rational(60,1);
            SharpDX.dxgi.ModeDescription modeDescription = new SharpDX.dxgi.ModeDescription(100,100,rational,SharpDX.dxgi.Format.R8G8B8A8_Unorm);
            SharpDX.dxgi.SampleDescription sampleDescription = new SharpDX.dxgi.SampleDescription(1,0);

            using (SharpDX.Windows.RenderForm renderForm = new SharpDX.Windows.RenderForm())
            {
                SharpDX.dxgi.SwapChainDescription swapChainDescription = new SharpDX.dxgi.SwapChainDescription();
                swapChainDescription.BufferCount = 1;
                swapChainDescription.Flags = SharpDX.dxgi.SwapChainFlags.None;
                swapChainDescription.IsWindowed = true;
                swapChainDescription.ModeDescription = modeDescription;
                swapChainDescription.OutputHandle = renderForm.Handle;
                swapChainDescription.SampleDescription = sampleDescription;
                swapChainDescription.SwapEffect = SharpDX.dxgi.SwapEffect.discard;
                swapChainDescription.Usage = SharpDX.dxgi.Usage.rendertargetOutput;

                SharpDX.Direct3D11.Device device = null;
                SharpDX.dxgi.SwapChain swapChain = null;
                SharpDX.Direct3D11.Device.CreateWithSwapChain(SharpDX.Direct3D.DriverType.Hardware,SharpDX.Direct3D11.DeviceCreationFlags.BgraSupport,swapChainDescription,out device,out swapChain);
                try
                {
                    IntPtr swapChainVirtualTable = Marshal.ReadIntPtr(swapChain.NativePointer);

                    SWAP_CHAIN_VIRTUAL_TABLE_ADDRESSES = new IntPtr[VIRTUAL_METHOD_COUNT_LEVEL_DEFAULT];
                    for (int x = 0; x < VIRTUAL_METHOD_COUNT_LEVEL_DEFAULT; x++)
                    {
                        SWAP_CHAIN_VIRTUAL_TABLE_ADDRESSES[x] = Marshal.ReadIntPtr(swapChainVirtualTable,x * IntPtr.Size);
                    }

                    device.dispose();
                    swapChain.dispose();
                }
                catch (Exception)
                {
                    if (device != null)
                    {
                        device.dispose();
                    }

                    if (swapChain != null)
                    {
                        swapChain.dispose();
                    }

                    throw;
                }
            }
        }

        public TestSwapChainHook()
        {
            this._present = null;

            this.presentHook = new Hook<dxgiSwapChainPresentDelegate>(
                        SWAP_CHAIN_VIRTUAL_TABLE_ADDRESSES[(int)IdxgiSwapChainVirtualTable.Present],new dxgiSwapChainPresentDelegate(hookPresent),this);
        }

        public void activate()
        {
            this.presentHook.activate();
        }

        public void deactivate()
        {
            this.presentHook.deactivate();
        }

        private int hookPresent(IntPtr thisPtr,SharpDX.dxgi.PresentFlags flags)
        {
            lock (this.presentHook)
            {
                if (this._present == null)
                {
                    return this.presentHook.original(thisPtr,syncInterval,flags);
                }
                else
                {
                    return this._present(new UnmodifiableHook<dxgiSwapChainPresentDelegate>(this.presentHook),thisPtr,flags);
                }
            }
        }

        public dxgiSwapChainPresentHookDelegate present
        {
            get
            {
                lock (this.presentHook)
                {
                    return this._present;
                }
            }
            set
            {
                lock (this.presentHook)
                {
                    this._present = value;
                }
            }
        }
    }
}

使用代码

初始化

private TestSwapChain swapChainHook;
private bool capture = false;
private object captureLock = new object();

this.swapChainHook = new TestSwapChainHook();
this.swapChainHook.present = presentHook;
this.swapChainHook.activate();

编辑

我用不同的方法来捕获this链接中描述的截图.不过我的屏幕截图如下：

现在,这似乎是我的转换设置或任何问题,但我无法找出我需要做什么来解决它.我知道我正在转换为位图的表面使用dxgi_FORMAT_R10G10B10A2_UnorM格式(32位,每种颜色10位,而我认为的是2).但是我不知道这在if循环中是如何工作的(跳过字节和东西).我只是简单的复制粘贴它.

新的钩子功能

private int presentHook(UnmodifiableHook<IdxgiSwapChainHook.dxgiSwapChainPresentDelegate> hook,SharpDX.dxgi.PresentFlags flags)
{
    try
    {
        lock (this.captureLock)
        {
            if (this.capture)
            {
                SharpDX.dxgi.SwapChain swapChain = (SharpDX.dxgi.SwapChain)thisPtr;

                using (SharpDX.Direct3D11.Texture2D backBuffer = swapChain.GetBackBuffer<SharpDX.Direct3D11.Texture2D>(0))
                {
                    SharpDX.Direct3D11.Texture2DDescription texture2DDescription = backBuffer.Description;
                    texture2DDescription.cpuAccessFlags = SharpDX.Direct3D11.cpuAccessFlags.Read;
                    texture2DDescription.Usage = SharpDX.Direct3D11.ResourceUsage.Staging;
                    texture2DDescription.OptionFlags = SharpDX.Direct3D11.ResourceOptionFlags.None;
                    texture2DDescription.BindFlags = SharpDX.Direct3D11.BindFlags.None;

                    using (SharpDX.Direct3D11.Texture2D texture = new SharpDX.Direct3D11.Texture2D(backBuffer.Device,texture2DDescription))
                    {
                        //dxgi_FORMAT_R10G10B10A2_UnorM
                        backBuffer.Device.ImmediateContext.copyResource(backBuffer,texture);

                        using (SharpDX.dxgi.Surface surface = texture.QueryInterface<SharpDX.dxgi.Surface>())
                        {
                            SharpDX.DataStream dataStream;
                            SharpDX.DataRectangle map = surface.Map(SharpDX.dxgi.MapFlags.Read,out dataStream);
                            try
                            {
                                byte[] pixelData = new byte[surface.Description.Width * surface.Description.Height * 4];
                                int lines = (int)(dataStream.Length / map.Pitch);
                                int dataCounter = 0;
                                int actualWidth = surface.Description.Width * 4;

                                for (int y = 0; y < lines; y++)
                                {
                                    for (int x = 0; x < map.Pitch; x++)
                                    {
                                        if (x < actualWidth)
                                        {
                                            pixelData[dataCounter++] = dataStream.Read<byte>();
                                        }
                                        else
                                        {
                                            dataStream.Read<byte>();
                                        }
                                    }
                                }

                                GCHandle handle = GCHandle.Alloc(pixelData,GCHandleType.Pinned);
                                try
                                {
                                    using (Bitmap bitmap = new Bitmap(surface.Description.Width,surface.Description.Height,map.Pitch,PixelFormat.Format32bppArgb,handle.AddrOfPinnedobject()))
                                    {
                                        bitmap.Save(@"C:\Users\SOMEUSERNAME\Desktop\test.bmp");
                                    }
                                }
                                finally
                                {
                                    if (handle.IsAllocated)
                                    {
                                        handle.Free();
                                    }
                                }
                            }
                            finally
                            {
                                surface.Unmap();

                                dataStream.dispose();
                            }
                        }
                    }
                }

                this.capture = false;
            }
        }
    }
    catch(Exception ex)
    {
        MessageBox.Show(ex.ToString());
    }

    return hook.original(thisPtr,flags);
}

回答

结果dxgi_FORMAT_R10G10B10A2_UnorM格式是这种位格式：

A=alpha
B=blue
G=green
R=red

AABBBBBB BBBBGGGG GGGGGGRR RRRRRRRR

而格式32bppArgb是这样的字节顺序：

BGRA

所以最后的循环代码是：

while (pixelIndex < pixelData.Length)
{
    uint currentPixel = dataStream.Read<uint>();

    uint r = (currentPixel & 0x3FF);
    uint g = (currentPixel & 0xFFC00) >> 10;
    uint b = (currentPixel & 0x3FF00000) >> 20;
    uint a = (currentPixel & 0xC0000000) >> 30;

    pixelData[pixelIndex++] = (byte)(b >> 2);
    pixelData[pixelIndex++] = (byte)(g >> 2);
    pixelData[pixelIndex++] = (byte)(r >> 2);
    pixelData[pixelIndex++] = (byte)(a << 6);

    while ((pixelIndex % map.Pitch) >= actualWidth)
    {
        dataStream.Read<byte>();
        pixelIndex++;
    }
}

解决方法

那个屏幕截图看起来像R10G10B10A2被塞进R8G8B8A8.我没有测试过你的代码,但我们应该有这个位布局

xxxxxxxx yyyyyyyy zzzzzzzz wwwwwwww
RRRRRRRR RRGGGGGG GGGGBBBB BBBBBBAA

您可以如下提取它们

byte x = data[ptr++];
byte y = data[ptr++];
byte z = data[ptr++];
byte w = data[ptr++];

int r = x << 2 | y >> 6;
int g = (y & 0x3F) << 4 | z >> 4;
int b = (z & 0xF) << 6 | w >> 2;
int a = w & 0x3;

其中r,g,b现在有10位分辨率.如果要将其缩放到字节,可以使用(byte)(r>> 2)来实现.

更新

这将取代你的双for循环.我没有办法测试,所以我不想进一步推进,但我相信这个想法是正确的.最后一次检查应该跳过每行的填充字节.

while(dataCounter < pixelData.Length)
{

    byte x = dataStream.Read<byte>();
    byte y = dataStream.Read<byte>();
    byte z = dataStream.Read<byte>();
    byte w = dataStream.Read<byte>();

    int r = x << 2 | y >> 6;
    int g = (y & 0x3F) << 4 | z >> 4;
    int b = (z & 0xF) << 6 | w >> 2;
    int a = w & 0x3;

    pixelData[dataCounter++] = (byte)(r >> 2);
    pixelData[dataCounter++] = (byte)(g >> 2);
    pixelData[dataCounter++] = (byte)(b >> 2);
    pixelData[dataCounter++] = (byte)(a << 6);

    while((dataCounter % map.Pitch) >= actualWidth)
    {
        dataStream.Read<byte>();
        dataCounter++;
    }

}

原文地址：https://www.jb51.cc/csharp/93742.html