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。 9 l9 |: j( p, n* B3 m% m
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5 |5 Z6 n/ a [8 O4 y8 q7 ?8 zhttp://hi.baidu.com/widebright/blog/item/6b3a233f97147eea54e7233f.html
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( f* }; t) ]* X M. i9 G* b在VS2003, DirectX9, Windows xp中测试通过,可能需要安装 DirectXSDK才能编译成功的。
. y2 ^# [" V8 ], E4 x2 z8 s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。 * y0 |7 O( ^5 ]/ Q7 L6 v
8 C1 I" q% K6 M# d' Q, U, s, g# L2 E// Direct3D9 includes ' \ q$ v$ J5 F; b$ ?2 ~
#include <d3d9.h> ( Y9 k& a8 d1 _; w% k5 j9 P6 G& G
#include <d3dx9.h>
! I4 x$ |+ C- P" G% ~#pragma comment( lib, "d3d9.lib" ) 0 ]* ~: c% V0 o/ l" ^! e. R
#pragma comment( lib, "d3dx9.lib" ) # Z4 n- c7 {" Z
' u- Q/ G8 _% i. Zint Capture () ) T+ m8 N% b+ A7 ]$ ^; F+ c* o
{ # r- {- O: |4 W t& E
LPDIRECT3D9 g_pD3D = NULL;
$ Y- n3 h$ D! [' g" d9 L" sD3DDISPLAYMODE ddm; ! ~$ t" ]4 K: {7 @. V
D3DPRESENT_PARAMETERS d3dpp; 3 q4 U" K9 t7 ]' C8 F
, ?1 c3 K% P1 W; @( @' v2 jIDirect3DDevice9 * g_pd3dDevice; , V8 ]: V) l5 t+ A6 s
IDirect3DSurface9 * pSurface;
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* _% M* p7 z" m) _4 a! V- fZeroMemory(&d3dpp,sizeof(D3DPRESENT_PARAMETERS)); 5 F1 G! D+ w1 e5 t! E
ZeroMemory( &d3dpp, sizeof(d3dpp) ); 2 V5 S& D' e$ ~
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if((g_pD3D=Direct3DCreate9(D3D_SDK_VERSION))==NULL) / K) F- u8 N* E
{
. T: G# Q9 r2 Z$ ^; p) breturn 1; ( ~2 Q# K- [4 ^6 R1 Q9 V8 _
} 0 Q( {$ {5 C4 b3 B' y
if(FAILED(g_pD3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT,&ddm)))
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return 1;
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d3dpp.Windowed=TRUE;
/ k- s% c5 x5 q6 p5 w" Ad3dpp.Flags=D3DPRESENTFLAG_LOCKABLE_BACKBUFFER; ) G: [& V8 R# J. F0 ^
d3dpp.BackBufferFormat=ddm.Format;
/ W; f1 ?! t' Id3dpp.BackBufferHeight=ddm.Height;
8 e/ _8 G$ q6 zd3dpp.BackBufferWidth=ddm.Width;
: k( l9 Q% E, T" K" Qd3dpp.MultiSampleType=D3DMULTISAMPLE_NONE;
2 t* A' U* r4 B2 b3 a% y( h- {! od3dpp.SwapEffect=D3DSWAPEFFECT_DISCARD;
9 H5 N6 ]+ @6 o- O& i0 L; pd3dpp.hDeviceWindow=GetDesktopWindow();
5 a& J: J: W% p: t& r) Qd3dpp.PresentationInterval=D3DPRESENT_INTERVAL_DEFAULT; . u9 Y$ d: m. {) ^
d3dpp.FullScreen_RefreshRateInHz=D3DPRESENT_RATE_DEFAULT; ( b. D0 r; [* B! }
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8 i1 \; t+ {5 w. |% v- s p+ fif(FAILED(g_pD3D->CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,GetDesktopWindow(),D3DCREATE_SOFTWARE_VERTEXPROCESSING ,&d3dpp,&g_pd3dDevice)))
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return 1; * A- g* ~' a9 c8 I
} ' J7 M w2 r: ^, W
. T, M4 r( N3 Q% @9 L1 o* Vif(FAILED(g_pd3dDevice->CreateOffscreenPlainSurface(ddm.Width, ddm.Height, D3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, &pSurface, NULL))) 8 E6 g" S- T- T5 o6 G
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return 1; : h8 O% O; m8 U
}
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g_pd3dDevice->CreateOffscreenPlainSurface(1024, 768,
3 E P4 u) }7 M. bD3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, &pSurface, NULL); + j) R1 g$ I$ e' r& _5 k
g_pd3dDevice->GetFrontBufferData(0, pSurface); 1 R3 k: ]+ N3 J, Y' o
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D3DXSaveSurfaceToFile("Desktop.png",D3DXIFF_PNG,pSurface,NULL,NULL);//s保存为png格式
* I, w9 T. U8 F+ h& nD3DXSaveSurfaceToFile("Desktop.jpg",D3DXIFF_JPG,pSurface,NULL,NULL);//保存为 jpg格式
: w8 }3 O" b* |# cD3DXSaveSurfaceToFile("Desktop.bmp",D3DXIFF_BMP,pSurface,NULL,NULL);//保存为 bmp格式
! C }0 N" ?( E4 ~& O- e8 f4 ppSurface->Release();
% V; M( C7 X* j% vg_pd3dDevice->Release ();
9 S) O9 ^' g( u% ~9 |8 k5 bg_pD3D->Release (); * g& O }; \1 h; v6 g d( V) ~
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return 0; 6 Z- z9 z3 `6 V4 Z; n: `
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//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),
, p4 O0 c. P- W0 K9 Q' i//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 7 }" y+ F, I* ^8 W* G
//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 5 u2 i5 x! ]) H2 o# J
//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。 & F5 C9 |' z% F$ n: `
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//下面是些参考资料:
2 i- u, W3 B' _5 p; j2 p//Video Renderer (VR)是接收RGB/YUV裸数据,然后在显示器上显示的Filter。 . |# F# q- x% l" H8 `6 x
//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;
+ g6 D' s5 H- K! x0 }) G( [) M//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 ) `) s+ z& p: F% Q
//Video Mixing Renderer Filter 7 (VMR-7), / ^4 k+ U6 o9 {5 a! K0 G
//可以这么说,VMR是Windows平台上新一代的Video Renderer。
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( b2 {( r/ `, H2 G+ F//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 - O* B& I7 A$ D) t5 i; \- F
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//One consequence of hardware overlay use is that a screenshot program (for example, " P; A0 n0 ?9 s/ X, L4 C" Z
//the one automatically built into Windows that activates when the PrtSc key is pressed)
% x- I7 C: s2 \8 G! V//often does not capture the content appearing in the hardware overlay window. Rather, . `4 @9 B$ ~% m
//a blank region containing only the special mask color is captured. This is because the
, k3 I( Q z" m" r% y& I# R//screen capture routine doesn't consider the special video memory regions dedicated to
+ b, C n6 Q( P ` L" {+ O//overlays - it simply captures the shared main screen as rendered by the software's graphical
2 L/ Z2 \( h; \- w, l//subsystem. Some Digital Rights Management schemes use hardware overlay to display
3 G# X3 p/ v- W//protected content on the screen, taking advantage of this quirk to prevent the copying of
: G3 Z/ l# |" k4 y- ~) m//protected documents by way of screen capture[citation needed]. Disabling the support for
1 F G( X/ g& b//overlays causes the normally overlay using software to fallback to the shared memory,
2 \* [( t( e% @5 z% D5 X//enabling screenshots.
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//Starting with Windows Vista's enhanced graphics capabilities, the basic concept ( n4 P8 ~+ ^( z* W3 _
//of hardware overlays is replaced by full hardware compositing for every application window
% d+ X) d1 L. a# b//running on the system, not just movie players or games, through the Desktop Window Manager. ! g8 K; z0 m2 k* I# e: O
//Mac OS X has been using hardware compositing since Quartz Extreme was introduced in Mac OS X 10.2.
, a: b( N+ b8 f. p8 l# ?) O8 n6 R$ a//To improve performance, each program draws to its own independent memory buffer instead of to a
* t' I/ s6 w9 z( Z+ z+ B1 J//slow graphical subsystem. (In Windows Vista, each hardware overlay is more correctly known as 7 o+ n5 h; G+ N/ D. S& M, f
//a Direct3D surface). Then, the system's GPU assembles each of the windows into a single 3 C# @) ?6 _% i) b; U
//display screen in real time. With enhanced GPUs on the market capable of stunning 3D
5 N. s! `: @ N7 o//graphics as a consequence of the video game industry, impressive motion, scaling,
" D2 r9 d! `( }. T/ F% t//and lighting effects can be applied to normal 2D windows by the operating system.
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//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。
2 U3 `: ~1 c9 C6 D' M; x//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。
" V! q5 B: s9 C S% c4 \//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。 0 C6 s6 c% d/ Z3 s
//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 |