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++;
}
}
