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。
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- d' j9 r, r! B+ i原文
# y( W/ u! l' b9 Q7 }& f8 p% M: Khttp://hi.baidu.com/widebright/blog/item/6b3a233f97147eea54e7233f.html& b: I0 A3 _+ g
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在VS2003, DirectX9, Windows xp中测试通过,可能需要安装 DirectXSDK才能编译成功的。
8 `$ A# ^5 B+ _' }: ^. n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。 # w7 }) A; b0 |) b! w [
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// Direct3D9 includes
+ K: Z7 u" m8 E1 ~% L% h#include <d3d9.h>
4 f% K0 g/ Y9 w" |+ _8 W#include <d3dx9.h> 1 ?( L- N4 Q, o* w: M# W
#pragma comment( lib, "d3d9.lib" )
, K/ v4 k& V7 v) s8 B N% V1 b#pragma comment( lib, "d3dx9.lib" )
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int Capture () 9 [# Y9 Q- v7 `
{
4 R! F+ E4 S2 B6 k1 ]9 X. u+ nLPDIRECT3D9 g_pD3D = NULL; # L. j* L$ d. z, R9 d& n* x
D3DDISPLAYMODE ddm;
2 r; I7 S# s. `: e- DD3DPRESENT_PARAMETERS d3dpp;
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IDirect3DDevice9 * g_pd3dDevice; ( d! D+ D4 y8 ]) F# k$ m
IDirect3DSurface9 * pSurface; ( J- Q% w2 h8 @/ U
. o" f7 ]8 u5 Z7 y! {+ ^ZeroMemory(&d3dpp,sizeof(D3DPRESENT_PARAMETERS));
$ W) R) O( e5 L6 v$ j5 eZeroMemory( &d3dpp, sizeof(d3dpp) ); * K+ R- [1 B1 r. ?- g" T7 }8 f/ O
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0 _$ ?' `2 o+ Q# v& O k7 bif((g_pD3D=Direct3DCreate9(D3D_SDK_VERSION))==NULL)
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- R+ J V# P8 I0 y4 y, ^$ h8 Ireturn 1; - e# |# I {9 K# L/ f
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if(FAILED(g_pD3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT,&ddm)))
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7 m( f- f0 }- @$ Q" Y! y7 [4 preturn 1; 7 V) h/ A) V" i c6 v
}
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- j, S) s* }/ Yd3dpp.Windowed=TRUE;
, ^/ l: v& P5 T' \" z2 xd3dpp.Flags=D3DPRESENTFLAG_LOCKABLE_BACKBUFFER; & W U5 [% ^: {7 ^7 X' W
d3dpp.BackBufferFormat=ddm.Format; 4 }, X' p! G; l: t) L3 O: k
d3dpp.BackBufferHeight=ddm.Height; * x1 P7 }5 A3 w
d3dpp.BackBufferWidth=ddm.Width; % [: v! B) p! R& C0 W
d3dpp.MultiSampleType=D3DMULTISAMPLE_NONE;
) G4 _. ]' Y! W, H& H2 `# x; ud3dpp.SwapEffect=D3DSWAPEFFECT_DISCARD;
: [1 o# C8 v. Sd3dpp.hDeviceWindow=GetDesktopWindow(); ' R$ ~' l: W) n6 J, F7 A4 E. Y* N3 E
d3dpp.PresentationInterval=D3DPRESENT_INTERVAL_DEFAULT;
0 }) A) M/ I8 G0 Gd3dpp.FullScreen_RefreshRateInHz=D3DPRESENT_RATE_DEFAULT; 7 H9 o6 w8 K ?: ]" d! J% E
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if(FAILED(g_pD3D->CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,GetDesktopWindow(),D3DCREATE_SOFTWARE_VERTEXPROCESSING ,&d3dpp,&g_pd3dDevice))) " s5 ]/ o/ J9 ?$ o
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return 1; 4 h+ R* F2 x0 o
}
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if(FAILED(g_pd3dDevice->CreateOffscreenPlainSurface(ddm.Width, ddm.Height, D3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, &pSurface, NULL))) 5 X; K7 V% |; R& t
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return 1; 2 B- r H/ L2 h2 t! M5 n" Q
} 4 d7 A" w; E" L/ {0 ]8 h- L: f
( S* ~. V/ z1 Q+ L! Sg_pd3dDevice->CreateOffscreenPlainSurface(1024, 768,
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g_pd3dDevice->GetFrontBufferData(0, pSurface);
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D3DXSaveSurfaceToFile("Desktop.png",D3DXIFF_PNG,pSurface,NULL,NULL);//s保存为png格式 9 N; K G& M8 B1 S; O0 ?
D3DXSaveSurfaceToFile("Desktop.jpg",D3DXIFF_JPG,pSurface,NULL,NULL);//保存为 jpg格式
' y) R% }1 ?+ U ~( x; ?D3DXSaveSurfaceToFile("Desktop.bmp",D3DXIFF_BMP,pSurface,NULL,NULL);//保存为 bmp格式 9 h6 `8 v/ ` Z! O
pSurface->Release(); ' e/ e& k) s+ J( M0 |( r
g_pd3dDevice->Release (); . E% V1 O; ^% U% M
g_pD3D->Release ();
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return 0;
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1 i1 V' m9 F5 U( Q# P//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),
z1 W% j d% q8 r U/ D//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
' f6 F* s8 X+ z! l5 p//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
" f) t; Z) ~2 X: i7 e//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。
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- c3 r& e8 u* E3 A! S//下面是些参考资料: / J6 X1 g7 O- @& F3 G# ~
//Video Renderer (VR)是接收RGB/YUV裸数据,然后在显示器上显示的Filter。
: |& g. J2 }% a2 R% m3 j//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;
% v. L" W* A8 ~1 z' u+ 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
) M" x3 E; W, ~5 ?$ s//Video Mixing Renderer Filter 7 (VMR-7),
* z# W; R2 W! Q/ v! ]# k& a8 d# S( k//可以这么说,VMR是Windows平台上新一代的Video Renderer。
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3 C! t+ O' e( @; j5 n//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 0 v9 e) W* }0 s& f/ B' j$ b: r
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//One consequence of hardware overlay use is that a screenshot program (for example, & u8 n# p5 u5 {. T! l
//the one automatically built into Windows that activates when the PrtSc key is pressed)
1 P9 _, D7 Y5 R, Q//often does not capture the content appearing in the hardware overlay window. Rather,
$ u9 e1 P3 H' N; g+ f/ v//a blank region containing only the special mask color is captured. This is because the
G; G1 [! [ i$ w# X2 ~/ o1 {7 c//screen capture routine doesn't consider the special video memory regions dedicated to 9 E! X; h( ^% z! F0 X
//overlays - it simply captures the shared main screen as rendered by the software's graphical # ^2 W- z' j! R' a4 P8 G' B; r+ v5 S
//subsystem. Some Digital Rights Management schemes use hardware overlay to display 7 i+ q1 u; i& {; Q
//protected content on the screen, taking advantage of this quirk to prevent the copying of 8 d; E( T. M( J+ \# s
//protected documents by way of screen capture[citation needed]. Disabling the support for ) ^5 ]9 \4 f7 M0 M. @! `; M
//overlays causes the normally overlay using software to fallback to the shared memory, / P( m# }4 U+ w, l; d' z( ?
//enabling screenshots.
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//Starting with Windows Vista's enhanced graphics capabilities, the basic concept
* v3 Q: X: B1 G8 }/ A% _//of hardware overlays is replaced by full hardware compositing for every application window
* v& s9 X* z3 \. f- }9 }4 ]& q//running on the system, not just movie players or games, through the Desktop Window Manager. 6 U9 `6 U2 H3 d
//Mac OS X has been using hardware compositing since Quartz Extreme was introduced in Mac OS X 10.2. 5 J0 N; D! {: a& C
//To improve performance, each program draws to its own independent memory buffer instead of to a
6 w* \" u" U* O//slow graphical subsystem. (In Windows Vista, each hardware overlay is more correctly known as
+ N+ O$ ]; ^2 T6 h& _. n//a Direct3D surface). Then, the system's GPU assembles each of the windows into a single + s; m; w. x# e6 r
//display screen in real time. With enhanced GPUs on the market capable of stunning 3D
* T: o" x4 F2 H8 |9 Z5 b//graphics as a consequence of the video game industry, impressive motion, scaling, 4 \" ^. S$ q, R0 u2 V) A1 `4 _; k4 ^
//and lighting effects can be applied to normal 2D windows by the operating system.
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5 O' Z, l) C+ V$ ?& k6 }//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。 0 K# A7 a% H) G4 R% n$ I# B
//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。 " g' x0 Y+ B( ?
//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+ H& l/ m7 r" @. Y2 R# A//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 |