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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* V! g) k3 Z4 p% L1 j0 m原文3 n: b* W, l' C9 ~0 ]
http://hi.baidu.com/widebright/blog/item/6b3a233f97147eea54e7233f.html7 P/ Y z3 D3 d; c1 `0 `
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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。
2 a9 e8 s! T4 w9 b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。 $ L" ]* Z+ I2 }7 C9 O9 J% D
& v1 {2 k Q; x p// Direct3D9 includes
6 }% ^0 k: f' b. ?3 A* y#include <d3d9.h>
! ` u& I. [% u, h2 n) h* u6 n#include <d3dx9.h> 7 H; K, W# n6 x/ ?9 q
#pragma comment( lib, "d3d9.lib" )
2 o& N7 }. H5 B# N$ S! t+ W#pragma comment( lib, "d3dx9.lib" )
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& @! [" d4 o! X c# Nint Capture ()
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LPDIRECT3D9 g_pD3D = NULL; ) w7 K' @# W/ C! v* i0 U- U
D3DDISPLAYMODE ddm; ) Q$ w0 M6 k$ m2 O. ?8 r r1 m
D3DPRESENT_PARAMETERS d3dpp; $ @. S0 y( N3 ]6 i7 l9 I
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IDirect3DDevice9 * g_pd3dDevice;
5 B8 E4 Y4 K" [IDirect3DSurface9 * pSurface; 3 g) l+ p) I) S& d. t/ Q/ }
/ Z# ` q' U( Z! M F1 yZeroMemory(&d3dpp,sizeof(D3DPRESENT_PARAMETERS));
B; o' o* \) X& X9 xZeroMemory( &d3dpp, sizeof(d3dpp) );
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if((g_pD3D=Direct3DCreate9(D3D_SDK_VERSION))==NULL)
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! P* C5 b& Z) b9 Mreturn 1;
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2 T* h! \8 w1 j0 d( D: tif(FAILED(g_pD3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT,&ddm)))
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& Q! \8 `; R5 y$ G0 freturn 1; # Q# o3 `/ X0 v) N/ w
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, K% N) D$ a" S' j) h1 ^& Q& K8 M) ]d3dpp.Windowed=TRUE;
; ?, J0 d& q" J% Y6 Hd3dpp.Flags=D3DPRESENTFLAG_LOCKABLE_BACKBUFFER;
; _! Z$ X" a: [5 r, e, H. V1 Rd3dpp.BackBufferFormat=ddm.Format;
2 S- E8 l. r- R5 Id3dpp.BackBufferHeight=ddm.Height; 3 l2 i' F6 {! A# C8 [) g
d3dpp.BackBufferWidth=ddm.Width; # J) F- d/ z* Y* |- r" L( j
d3dpp.MultiSampleType=D3DMULTISAMPLE_NONE; : Q: _8 T# T. X3 U! r
d3dpp.SwapEffect=D3DSWAPEFFECT_DISCARD;
2 ]3 K% @/ E, Cd3dpp.hDeviceWindow=GetDesktopWindow(); " K/ u" F6 h% `' Q# c1 ], W" ?
d3dpp.PresentationInterval=D3DPRESENT_INTERVAL_DEFAULT;
6 e8 n, C0 L1 |; X( G- Od3dpp.FullScreen_RefreshRateInHz=D3DPRESENT_RATE_DEFAULT;
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! P* u3 l- y& e6 f1 ?6 W- v9 u- Kif(FAILED(g_pD3D->CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,GetDesktopWindow(),D3DCREATE_SOFTWARE_VERTEXPROCESSING ,&d3dpp,&g_pd3dDevice)))
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( d t( J R; L" O$ \1 D; ~return 1;
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if(FAILED(g_pd3dDevice->CreateOffscreenPlainSurface(ddm.Width, ddm.Height, D3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, &pSurface, NULL)))
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return 1;
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g_pd3dDevice->CreateOffscreenPlainSurface(1024, 768,
; Z5 Q# ^8 I; T) v" JD3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, &pSurface, NULL);
" V1 M: l0 K/ p N& s% N, Eg_pd3dDevice->GetFrontBufferData(0, pSurface); 1 o7 P* e, L3 b9 T
' Q a3 B' G K( {9 I: k( XD3DXSaveSurfaceToFile("Desktop.png",D3DXIFF_PNG,pSurface,NULL,NULL);//s保存为png格式 0 W! Z+ z6 o% R' D8 s
D3DXSaveSurfaceToFile("Desktop.jpg",D3DXIFF_JPG,pSurface,NULL,NULL);//保存为 jpg格式
$ x1 e; o6 l3 A, _D3DXSaveSurfaceToFile("Desktop.bmp",D3DXIFF_BMP,pSurface,NULL,NULL);//保存为 bmp格式 ) b& F7 H3 \9 {, |1 G# Y" U
pSurface->Release();
: _0 c' {6 J7 J+ _2 hg_pd3dDevice->Release ();
8 q+ B. i1 F4 z& t' Lg_pD3D->Release ();
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) a/ ^7 ^* y8 G" Zreturn 0;
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7 G5 c; u* S& I9 d//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), 8 k* s3 F* h" r( @
//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 L0 t0 z! l+ W, ] A4 O
//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
7 Y5 s( s* A3 Z7 L$ |0 k* a//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。 8 l# @9 ?. r5 t- d6 r6 \# J
9 n! u6 B6 h) P6 h0 Z' H( z, h//下面是些参考资料:
( p& |5 h6 i# A- @) T* X) t& l//Video Renderer (VR)是接收RGB/YUV裸数据,然后在显示器上显示的Filter。 ! w6 k+ E0 {* z/ B
//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; 1 \- P1 K; J/ ~( 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 5 q( |$ n b1 ]% c, b
//Video Mixing Renderer Filter 7 (VMR-7),
/ s6 j( }5 I) B/ C2 H# j3 [+ M" S//可以这么说,VMR是Windows平台上新一代的Video Renderer。
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//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
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+ F( e9 X) }) j//One consequence of hardware overlay use is that a screenshot program (for example, 5 ~9 c8 w8 O& S$ n& z! c' I. ^" B
//the one automatically built into Windows that activates when the PrtSc key is pressed)
z- }% {1 i1 m4 b# z//often does not capture the content appearing in the hardware overlay window. Rather, i8 k, K5 |" t$ T
//a blank region containing only the special mask color is captured. This is because the 9 u" ]1 Z0 U+ |* ~
//screen capture routine doesn't consider the special video memory regions dedicated to " u) c$ ]1 T+ c$ S6 E
//overlays - it simply captures the shared main screen as rendered by the software's graphical " y# U2 E j! F6 R' d
//subsystem. Some Digital Rights Management schemes use hardware overlay to display
% G" ]! A2 i) ~; Q$ ~& Z//protected content on the screen, taking advantage of this quirk to prevent the copying of
. f9 K7 W& y9 t* x/ D) v9 r//protected documents by way of screen capture[citation needed]. Disabling the support for 7 o# I7 [" [$ ^, ~4 j q! j
//overlays causes the normally overlay using software to fallback to the shared memory, ( ~2 @; x6 F2 f) ~/ X$ H# s
//enabling screenshots. ) ?- M0 F$ I, l' ~0 c: r& k% ~
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//Starting with Windows Vista's enhanced graphics capabilities, the basic concept
]/ X1 M: w3 p. ?1 n* t//of hardware overlays is replaced by full hardware compositing for every application window
+ \% _ }4 i6 n! { k1 n2 {//running on the system, not just movie players or games, through the Desktop Window Manager.
) o/ F: u3 l9 R) o7 Y% M: M q//Mac OS X has been using hardware compositing since Quartz Extreme was introduced in Mac OS X 10.2.
+ f/ A9 d/ {6 A- ~2 Z//To improve performance, each program draws to its own independent memory buffer instead of to a & T: N. F; ^% V8 w. B& [
//slow graphical subsystem. (In Windows Vista, each hardware overlay is more correctly known as , X; Y' h: A1 D4 @ Z. H; B+ z) \3 I
//a Direct3D surface). Then, the system's GPU assembles each of the windows into a single
6 q. Z. r/ J3 k6 @' s, r# C//display screen in real time. With enhanced GPUs on the market capable of stunning 3D 1 s/ W0 v# j+ |# J+ X# C9 Z
//graphics as a consequence of the video game industry, impressive motion, scaling,
# t! \6 [( v! L/ W) G; C9 m& ]% F//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。 + f) b( t) I& S g% l4 A, X' p
//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。
8 B/ Q& t2 a, V//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。 ( T- p; O! q! a* T5 R3 ?, {
//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 |