【代理DLL汉化研究】DirectX3D9 技术实现的抓屏

shane007

在Hook代码中的，我们也许要对前台surface,后台surface的内容进行判断和保存，以下代码可以作为参考。
3 U7 e! p! m: B+ y3 v* ]: u% ?
原文
  z( ?% ^& ]( Y! |http://hi.baidu.com/widebright/blog/item/6b3a233f97147eea54e7233f.html

在VS2003， DirectX9， Windows xp中测试通过，可能需要安装 DirectXSDK才能编译成功的。
现在前面加上头文件和库， 然后需要截屏的时候，调用capture函数就可以了。

+ ~: V, d4 r/ B: H$ j  C; r; ?// Direct3D9 includes
#include <d3d9.h>
#include <d3dx9.h>
, B4 P2 l% l( m# K3 ]! V#pragma comment( lib, "d3d9.lib" )
( g4 O6 C4 |- N! c0 l#pragma comment( lib, "d3dx9.lib" )

  a9 ]2 g/ q# t) y+ ~7 n. Qint Capture ()
{
LPDIRECT3D9 g_pD3D = NULL;
D3DDISPLAYMODE ddm;
) \( G9 N+ h. [/ bD3DPRESENT_PARAMETERS d3dpp;
# O! S) s/ s! \4 U
IDirect3DDevice9 * g_pd3dDevice;
IDirect3DSurface9 * pSurface;
3 Z4 R+ I- R7 ~! X
, o: l0 U* R+ h- n  `ZeroMemory(&d3dpp,sizeof(D3DPRESENT_PARAMETERS));
ZeroMemory( &d3dpp, sizeof(d3dpp) );
% r. M1 m( ^" \4 e2 y( M" y
5 q2 p1 n; j- ^1 g% Z& {
if((g_pD3D=Direct3DCreate9(D3D_SDK_VERSION))==NULL)
{
& I6 k) \" K, N" Mreturn 1;
0 `( ~3 C  F' u' h4 D! z}
if(FAILED(g_pD3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT,&ddm)))
{
return 1;
}

d3dpp.Windowed=TRUE;
d3dpp.Flags=D3DPRESENTFLAG_LOCKABLE_BACKBUFFER;
d3dpp.BackBufferFormat=ddm.Format;
* Z: \& m# C9 R1 \% ud3dpp.BackBufferHeight=ddm.Height;
d3dpp.BackBufferWidth=ddm.Width;
* q3 ^7 S/ k- N9 k9 yd3dpp.MultiSampleType=D3DMULTISAMPLE_NONE;
d3dpp.SwapEffect=D3DSWAPEFFECT_DISCARD;
d3dpp.hDeviceWindow=GetDesktopWindow();
7 S2 m# h" E! Ed3dpp.PresentationInterval=D3DPRESENT_INTERVAL_DEFAULT;
$ V  Q( i( @1 R9 x) G  Vd3dpp.FullScreen_RefreshRateInHz=D3DPRESENT_RATE_DEFAULT;
% J) X; G3 a% M2 K7 y

if(FAILED(g_pD3D->CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,GetDesktopWindow(),D3DCREATE_SOFTWARE_VERTEXPROCESSING ,&d3dpp,&g_pd3dDevice)))
{
8 R' s4 N$ H' Freturn 1;
}

if(FAILED(g_pd3dDevice->CreateOffscreenPlainSurface(ddm.Width, ddm.Height, D3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, &pSurface, NULL)))
{
return 1;
6 x# ~6 o" s8 A! J; w# A( j6 O}
, g9 t3 [7 }8 n! z
g_pd3dDevice->CreateOffscreenPlainSurface(1024, 768,
D3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, &pSurface, NULL);
- p$ _; h, c8 f1 c- xg_pd3dDevice->GetFrontBufferData(0, pSurface);

D3DXSaveSurfaceToFile("Desktop.png",D3DXIFF_PNG,pSurface,NULL,NULL);//s保存为png格式
8 a) {- [' O8 N$ R6 K6 ^. x8 vD3DXSaveSurfaceToFile("Desktop.jpg",D3DXIFF_JPG,pSurface,NULL,NULL);//保存为 jpg格式
! h+ y- }5 p2 y' V; SD3DXSaveSurfaceToFile("Desktop.bmp",D3DXIFF_BMP,pSurface,NULL,NULL);//保存为 bmp格式
  K+ H; C! B5 apSurface->Release();
g_pd3dDevice->Release ();
g_pD3D->Release ();

. G7 [  i4 i* W9 f/ dreturn 0;

% b7 }4 Y% Z( k! ~* }) }0 [}
5 D* F% e# z" U* @4 Z: {# |
; o: A6 S8 r2 V$ z+ v//但这种方法并不能抓取有的播放器的图像，这是因为播放器显示页面时采用了hardware overlay （硬件加速），
//你需要在“显示” 设置里面禁用该功能。或者有时你会发现，你多开一个播放器窗口，后面的就可以抓屏了，因为
$ A9 T3 R, l9 p5 i) C//overlay 技术的硬件支持有限，后面的不能再用这个技术了。有的人说编程hook 了DirectDraw的相应函数可以禁用
' w- ^4 X2 Z# l4 A# G! t5 b; p//这个功能。有的抓屏软件也可以做到，不知道人家是怎么做的。
) s- }9 X( ?5 f1 }9 f7 Z
//下面是些参考资料：
//Video Renderer (VR)是接收RGB/YUV裸数据，然后在显示器上显示的Filter。
//为提高计算机画图性能，根据你计算机显卡的能力，VR会优先使用DirectDraw以及Overlay表面；
5 E8 \5 ]1 ]) T6 L( @//如果这些特性得不到显卡的支持，VR会使用GDI函数进行画图
//Video Mixing Renderer Filter 7 （VMR-7），
! a4 t9 y5 \8 G# L//可以这么说，VMR是Windows平台上新一代的Video Renderer。

//视频覆盖（Video Overlay） 或者说是hardware overlay 是早期的技术， 现在好像是VMR-7 ， VMR-9 了
+ J  T# E& Y  L+ {6 ]  @4 F
4 q; x/ `4 {# R- z+ D1 F* V//
- e( U) \' q8 ^5 F, e1 e//One consequence of hardware overlay use is that a screenshot program (for example,
! J. G1 N3 ~* k8 K//the one automatically built into Windows that activates when the PrtSc key is pressed)
//often does not capture the content appearing in the hardware overlay window. Rather,
: s( P5 j) W' {' `; ~9 n//a blank region containing only the special mask color is captured. This is because the
//screen capture routine doesn't consider the special video memory regions dedicated to
8 K7 e- b1 t2 Y+ i0 O9 l//overlays - it simply captures the shared main screen as rendered by the software's graphical
//subsystem. Some Digital Rights Management schemes use hardware overlay to display
* P" B& ?3 d1 p( c//protected content on the screen, taking advantage of this quirk to prevent the copying of
  x: U5 d4 Y5 I7 {//protected documents by way of screen capture[citation needed]. Disabling the support for
//overlays causes the normally overlay using software to fallback to the shared memory,
9 \' A2 Q8 O# B% d2 O8 t' J; @$ g//enabling screenshots.
. _) J! K* n% N. T/ s
//Starting with Windows Vista's enhanced graphics capabilities, the basic concept
+ n" {) ~- m: G# p5 V3 x//of hardware overlays is replaced by full hardware compositing for every application window
//running on the system, not just movie players or games, through the Desktop Window Manager.
//Mac OS X has been using hardware compositing since Quartz Extreme was introduced in Mac OS X 10.2.
) }9 O, D: J9 U! }1 f//To improve performance, each program draws to its own independent memory buffer instead of to a
//slow graphical subsystem. (In Windows Vista, each hardware overlay is more correctly known as
//a Direct3D surface). Then, the system's GPU assembles each of the windows into a single
6 v3 q, I" U/ }! H2 j4 o( [//display screen in real time. With enhanced GPUs on the market capable of stunning 3D
) N  a2 X" `2 x& v" S% k//graphics as a consequence of the video game industry, impressive motion, scaling,
//and lighting effects can be applied to normal 2D windows by the operating system.
' K/ d! s, Q6 _8 b

; m2 V9 I* [; U2 ]//步骤1双击“控制面板”中的“显示”图标，或在桌面空白位置单击右键，选择“属性”，打开显示属性设置窗口。选择“设置”选项卡，并单击窗口中的“高级”按钮，打开高级属性设置窗口。
//步骤2 在高级属性设置窗口中选择“疑难解答”选项卡，拖动“硬件加速”滑块至“无”，单击“确定”退出。
1 h# ~3 \0 x% m$ E! S- E8 z//步骤3 在视频播放软件比如RealOne中拖拉滑杆至需要截取的画面，按PrintScreen键截取屏幕界面。
. N- v# A$ q. n" G! I$ p/ U0 H* h//步骤4 打开“开始”/“程序”/“附件”/“画图”，单击“编辑”/“粘贴”将截取后存储于剪贴板的屏幕截图粘贴到画图程序中，可以看到，已经可以成功截取视频图像，不过，较之启用硬件加速功能，此时的视频图像质量会有一定程度的损失