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用Visual C++实现屏幕抓图程序

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 在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示: u>:(MARsR  
  ;H~<.QW  
  一、实现方法 U3V5Jo r#  
1s.2z[B~  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: |SjRss:i+  
6^'BTd  
#pragma data_seg("shareddata") -g2l-N{&  
HHOOK hHook =NULL; //钩子句柄 \_8wU' 7  
UINT nHookCount =0; //挂接的程序数目 A/'po_'uy  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ]1<GZ`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 9/(jY$Ar  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey v}Ju2}IK  
static int KeyCount =0; rjK`t_(=  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 u7[}pf$}  
#pragma data_seg() sg^|dS{3D  
w(6n  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 <8^x Mjc  
k[ro[E  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 0Z8"f_GK  
E(PBV  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR W/ Q*NB  
cKey,UCHAR cMask) byM-$l  
{ 6qH0]7maI  
 BOOL bAdded=FALSE; g5@g_~ g  
 for(int index=0;index<MAX_KEY;index++){ GcdJf/k  
  if(hCallWnd[index]==0){ _5-h\RB)  
   hCallWnd[index]=hWnd; H TOr  
   HotKey[index]=cKey; &2`p#riAS  
   HotKeyMask[index]=cMask; I} jgz  
   bAdded=TRUE; 3@gsKtA&H4  
   KeyCount++; Ck Nl;g l  
   break; }<0N)dpT  
  } Xv-p7$?f  
 } aaFT   
 return bAdded; ;Nj9,Va(t  
} D:_W;b)  
//删除热键 c[,h|~K/_?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $QC1l@[sM  
{ ;Y^'$I2fR#  
 BOOL bRemoved=FALSE; '*b]$5*p  
 for(int index=0;index<MAX_KEY;index++){ 9aJIq{`E  
  if(hCallWnd[index]==hWnd){ VIT|#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ y'K2#Y~1e  
    hCallWnd[index]=NULL; Z]]Ur  
    HotKey[index]=0; pZ.b X  
    HotKeyMask[index]=0; CP~ZIIip"  
    bRemoved=TRUE; \x}\)m_7M<  
    KeyCount--; IA@>'O  
    break; (h3L=  
   } aaR& -M@  
  } ;XurH%Mg  
 } 4a-JC"  
 return bRemoved; hF,|()E[  
} nMyl( kF[  
XVN`J]XHk  
U-I,Q+[C[^  
  DLL中的钩子函数如下: ?q:|vt  
3=YpZ\l}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)  }~/b%^  
{ %tyo(HZQ  
 BOOL bProcessed=FALSE; 43PLURay  
 if(HC_ACTION==nCode) u=.8M`FxP  
 { `5IrV&a  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 i41~-?Bc  
   switch(wParam) OM*c7&  
   {  y?<KN0j  
    case VK_MENU: %y6(+I #P  
     MaskBits&=~ALTBIT; lvO6&sF1  
     break; e7RgA1  
    case VK_CONTROL: ITn%  
     MaskBits&=~CTRLBIT; K oJ=0jM#  
     break; zw>L0gC  
    case VK_SHIFT: )XN_|zCk  
     MaskBits&=~SHIFTBIT; 4E39]vb  
     break; vk92j?  
    default: //judge the key and send message b6N[t _,  
     break; p{g4`o  
   } ;Bs~E  
   for(int index=0;index<MAX_KEY;index++){ C`[<6>&y  
    if(hCallWnd[index]==NULL) l6/VJ~(}'  
     continue; K92j BR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m4mE7Wn.3  
    { @8|*Ndx2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); s?w2^<P  
     bProcessed=TRUE; 1xB}Ed*k  
    } [eX]x  
   } ]vvYPRV76  
  } ("9bV8:@B  
  else if((lParam&0xc000ffff)==1){ //有键按下 .AfZ5s]/F  
   switch(wParam) cFUD$mp  
   { &lQ%;)'  
    case VK_MENU: vd%g'fTy9  
     MaskBits|=ALTBIT; 4)S99|1  
     break; zjpZ] $  
    case VK_CONTROL: srGOIK.  
     MaskBits|=CTRLBIT; 0MWW( ;  
     break; .kT]^rv ;  
    case VK_SHIFT: yLnQ9BXB&  
     MaskBits|=SHIFTBIT; XX8HSw!w  
     break; 3uLG$`N   
    default: //judge the key and send message Q(bOar5  
     break; {R}F4k  
   } DB/~Z  
   for(int index=0;index<MAX_KEY;index++){ q/#e6;x  
    if(hCallWnd[index]==NULL) 4q}+8F`0F  
     continue; YOl$sgg}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X1Yw=t~a  
    { F]\ Sk'}&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); t'n@yX_  
     bProcessed=TRUE; lPy|>&Yc  
    } x-BU$bx5  
   } I/O3OD  
  } Xs0)4U  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 mUBy*.  
   for(int index=0;index<MAX_KEY;index++){ bA^uzE  
    if(hCallWnd[index]==NULL) aLa<z Essz  
     continue; D:z'`v0j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 0#*6:{/^  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 2 XP }:e  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 !HY^QK  
   } UA>=# $  
  } xfYKUOp/  
 } Qs&;MW4q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); G4* LO  
} #Rw!a#CX.  
J(7#yg%5  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: aAg Qv*  
m'rDoly"62  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U,Z\)+-R  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (RddR{mX  
7%*#M#(T  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: &jE\D^>ko  
nK>CPqB^(  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3\7MeG`tl  
{ '+88UFSq5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) J p'^!  
 { xl&@g)Jj  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 EXDDUqZ5\  
  SaveBmp(); >8f~2dH2%  
  return FALSE; O$*lPA[  
 } 6{h\CU}"  
 …… //其它处理及默认处理 GG%b"d-  
} &6eo;8 `U  
)bUnk +_  
}]x \ `}o  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 /K:r4Kw  
HpnF,4A>  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 [LYO'-g^F#  
F%w! I 9  
  二、编程步骤 w!F>fcm  
O_FB^BB  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Nk'<*;e  
=U]9>  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; gRLt0&Q~  
? i{?Q,  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; aI=p_+.h  
'S`l[L:.8  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; aU!}j'5Q  
IZZAR  
  5、 添加代码,编译运行程序。 Q((&Q?Vi  
x[0T$  
三、程序代码 H*=cw<  
69c4bT:b"  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL hb`9Vn\-E  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Rl?1|$%  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ y=Y k$:-y  
#if _MSC_VER > 1000 Zxebv# 4  
#pragma once :?M_U;;z2+  
#endif // _MSC_VER > 1000 DQG%`-J  
#ifndef __AFXWIN_H__ \c_g9Iqa  
#error include 'stdafx.h' before including this file for PCH qc8Ge\3s  
#endif x3+ -wv  
#include "resource.h" // main symbols M':-f3aT%  
class CHookApp : public CWinApp V:\:[KcL^  
{ `B %%2p&  
 public: v;,W ^#`  
  CHookApp(); wm5&5F4:  
  // Overrides I}`pY3  
  // ClassWizard generated virtual function overrides )N.3Q1g-  
  //{{AFX_VIRTUAL(CHookApp) )OI}IWDl  
 public: kckRHbeU  
  virtual BOOL InitInstance(); ,GSiSn  
  virtual int ExitInstance(); 1Lb)S@Q`*R  
  //}}AFX_VIRTUAL <LbLMV  
  //{{AFX_MSG(CHookApp) lC5zqyG  
  // NOTE - the ClassWizard will add and remove member functions here. VVJ0?G (?  
  // DO NOT EDIT what you see in these blocks of generated code ! j7}mh  
  //}}AFX_MSG 5rsz2;#p  
  DECLARE_MESSAGE_MAP() ufXWK3~\  
}; %\JGDM*m  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ?C|'GkT  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); SU0SsgFB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g[} L ?  
BOOL InitHotkey(); ^/n1h g  
BOOL UnInit(); #}7T$Va  
#endif HPtMp#`T  
wd`p>  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. AiHU*dp6  
#include "stdafx.h" !tq]kKJ3:  
#include "hook.h" &y? |$p\;/  
#include <windowsx.h> [2@:jLth=  
#ifdef _DEBUG N9-0b  
#define new DEBUG_NEW 8"h;+;  
#undef THIS_FILE fG \" p  
static char THIS_FILE[] = __FILE__; Ej(BE@6>s  
#endif ~XR ('}5D  
#define MAX_KEY 100 |lNp0b  
#define CTRLBIT 0x04 m` 1dB%;?  
#define ALTBIT 0x02 z^9oaoTl  
#define SHIFTBIT 0x01 o/-RGLzAo  
#pragma data_seg("shareddata") B^2r4 9vC  
HHOOK hHook =NULL; 5{=+S]  
UINT nHookCount =0; /\1'.GR  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey [n"eD4)K|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Xt$qjtVM  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey @X/ 1`Mp  
static int KeyCount =0; }3lG'Y#Kpy  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 3@~a)E}T  
#pragma data_seg() ilL%  
HINSTANCE hins; .gO|=E"  
void VerifyWindow(); J!Z6$VERy  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) %R GZu\p  
//{{AFX_MSG_MAP(CHookApp) o*K7(yUL4  
// NOTE - the ClassWizard will add and remove mapping macros here. 0>Y3xNb  
// DO NOT EDIT what you see in these blocks of generated code! DuC#tDP  
//}}AFX_MSG_MAP K~:SLCv E%  
END_MESSAGE_MAP() rWr'+v?  
`l45T~`]$  
CHookApp::CHookApp() -r *|N.5c  
{ [8'?G5/n  
 // TODO: add construction code here, onu G  
 // Place all significant initialization in InitInstance d/  Lz"  
} kqB# 9  
V Rv4p5  
CHookApp theApp; uO4 LD}A  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3eY>LWx  
{ 'xS@cF o(  
 BOOL bProcessed=FALSE; .>W [  
 if(HC_ACTION==nCode) R+!U.:-yz  
 { zY/Oh9`=v  
  if((lParam&0xc0000000)==0xc0000000){// Key up xd{.\!q.  
   switch(wParam) i$kB6B#==  
   { 5WI bnV@  
    case VK_MENU: d>[i*u,]/  
     MaskBits&=~ALTBIT; O _9r-Zt^  
     break; xoVd[c!   
    case VK_CONTROL: \PS]c9@,rc  
     MaskBits&=~CTRLBIT; |&K;*g|a  
     break; k[*9b:~  
    case VK_SHIFT: w10~IP  
     MaskBits&=~SHIFTBIT; du$lS':`  
     break; A.*e8a/6X  
    default: //judge the key and send message dEYw_qJ2  
     break; KTYjC\\G  
   } X>$Wf3  
   for(int index=0;index<MAX_KEY;index++){ "6C a{n1hk  
    if(hCallWnd[index]==NULL) {N]WVp*R  
     continue; :?~)P!/xl5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8(`e\)%l0  
    { |kZ!-?9Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  8s22VL  
     bProcessed=TRUE; '=nmdqP  
    } UXji$|ET6  
   } DOu^   
  } GyL9}  
  else if((lParam&0xc000ffff)==1){ //Key down oI#TjF  
   switch(wParam) z uNm !$  
   { kb 74:  
    case VK_MENU: 7=G6ao7  
     MaskBits|=ALTBIT; 0V6, &rTF  
     break; q25p3  
    case VK_CONTROL: o|>=< l  
     MaskBits|=CTRLBIT; ="]lN  
     break; |8E~C~d  
    case VK_SHIFT: z wUC L  
     MaskBits|=SHIFTBIT; Mq~E'g4#  
     break; ZC2aIJ  
    default: //judge the key and send message z?13~e[D  
     break; y9mV6.r  
   } @~vg=(ic(  
   for(int index=0;index<MAX_KEY;index++) R:n|1]*f3X  
   { bbq`gEV  
    if(hCallWnd[index]==NULL) OybmyGHY  
     continue; e!0xh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2MB>NM<xO  
    { ajkV"~w',|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Q"s6HZ"YI  
     bProcessed=TRUE; Xc+YoA0Ez  
    } p p0356  
   } I]n X6=j5  
  } iJdJP)!tz6  
  if(!bProcessed){ `'|6b5`2j  
   for(int index=0;index<MAX_KEY;index++){ kKRu]0J~[  
    if(hCallWnd[index]==NULL) . AA# G  
     continue; < e3] pM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) g@x72$j  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); vE`;1UA}  
   } cFie;k  
  } a1_ N~4r`  
 } N5l`Rq^K  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,X|FyO(p  
} @[joM*U  
rmBzLZ}  
BOOL InitHotkey() 47Vt8oyh%  
{ #IGcQY  
 if(hHook!=NULL){ M &-p  
  nHookCount++; K?M~x&Q  
  return TRUE; !^Ay !  
 } oeKl\cgFx  
 else u gRyUny  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Q~"Lyy8  
  if(hHook!=NULL) -N/n|{+F  
   nHookCount++; DNj<:Pdd)  
  return (hHook!=NULL); $'}|/D  
} zEQQ4)mA  
BOOL UnInit() xBc$qjV  
{ N6kMl  
 if(nHookCount>1){ O<wH+k[  
  nHookCount--; xK0;saG#  
  return TRUE; ~tTa[_a!  
 } o1 27? ^  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ;~ Xjk  
 if(unhooked==TRUE){ mx1Bk9h%Xe  
  nHookCount=0; [jN Vk3  
  hHook=NULL; L$a{%]I  
 } "r;cH53  
 return unhooked; E_ 30)"]  
} qm#?DSLap  
j/O9LygB  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^{J^oZ'%~  
{ <NDV 5P  
 BOOL bAdded=FALSE; 44n41.Q]  
 for(int index=0;index<MAX_KEY;index++){ U1 3Lsky%  
  if(hCallWnd[index]==0){ A"DGn  
   hCallWnd[index]=hWnd; Y#):1C1  
   HotKey[index]=cKey;  })!-  
   HotKeyMask[index]=cMask; V@LBy1z  
   bAdded=TRUE; - A}$5/  
   KeyCount++; Yrf?|,  
   break; 4]zn,g?&  
  } 902A,*qq  
 } r#j3O}(n  
 return bAdded; cMtUb  
} QHXpX9  
_eQ-'")  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) b* n#XTV  
{ MS2/<LD3d  
 BOOL bRemoved=FALSE; wBI:}N@.  
 for(int index=0;index<MAX_KEY;index++){ IY~I=}  
  if(hCallWnd[index]==hWnd){ $h8?7:z;um  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Y$^vA[]c>  
    hCallWnd[index]=NULL;  j AoI`J  
    HotKey[index]=0; "AqLR  
    HotKeyMask[index]=0; `{yD\qDyX  
    bRemoved=TRUE; +|oLS_  
    KeyCount--; e?XGv0^qu  
    break; &9Z@P[f  
   } +yr~UP_ }  
  } D}{]5R  
 } bA6^R If?  
 return bRemoved; dqU)(T=C  
} a{;+_J3S  
!}`[s2ji  
void VerifyWindow() V LeYO5'L  
{ }!*|VdL0  
 for(int i=0;i<MAX_KEY;i++){ !#5y%Bf  
  if(hCallWnd!=NULL){ )g&nI <Mh  
   if(!IsWindow(hCallWnd)){ u,@ac[!vP  
    hCallWnd=NULL; va(6?"9  
    HotKey=0; $^e_4]k  
    HotKeyMask=0; p&xj7qwp@F  
    KeyCount--; "FE%k>aV@v  
   } f/kYm\Zc  
  } #~rQ\A!4  
 } 7k#>$sY+  
} ;$*tn"- ?~  
KB\ri&bF  
BOOL CHookApp::InitInstance() RU.MJ kYQ5  
{ E^w0X,0XlE  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 0ikA@SAq  
 hins=AfxGetInstanceHandle(); : @gW3'  
 InitHotkey(); e'v_eD T^  
 return CWinApp::InitInstance(); /lHs]) ,  
} <g&GIFE,  
Nb0T3\3W  
int CHookApp::ExitInstance() RY,L'Gt O  
{ FD8  
 VerifyWindow(); 't \sXN+1  
 UnInit(); pP\^bjI   
 return CWinApp::ExitInstance(); ]]u_Mdk  
} rJp9ut'FEz  
o9{1_7K  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file s }^W2  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) |c$*Fa"A  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ DM,;W`|6%  
#if _MSC_VER > 1000 ~2NT Xp  
#pragma once tnX W7ej^  
#endif // _MSC_VER > 1000 tuo'Uk)  
:K \IS`  
class CCaptureDlg : public CDialog \u/=?b  
{ 527u d^:  
 // Construction 93.L887  
 public:  OtZtl* 5  
  BOOL bTray; !cO<N~0*5x  
  BOOL bRegistered; )Ps<u-V  
  BOOL RegisterHotkey(); grd fR`3  
  UCHAR cKey; #b&=CsW`  
  UCHAR cMask; aXbj pb+  
  void DeleteIcon(); hg^k lQD  
  void AddIcon(); c)QOgXv  
  UINT nCount; .?F`H[^)^u  
  void SaveBmp(); 7pH[_]1"  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor A~a7/N6s;  
  // Dialog Data VM3)L>x]/  
  //{{AFX_DATA(CCaptureDlg) @a]`C $ 6  
  enum { IDD = IDD_CAPTURE_DIALOG }; "+&@iL  
  CComboBox m_Key; _=qk.|p/  
  BOOL m_bControl; nzB!0U  
  BOOL m_bAlt; ,y7X>M2  
  BOOL m_bShift; (WGEX(|  
  CString m_Path; n>lQ:l~  
  CString m_Number; eYg0 NEq{  
  //}}AFX_DATA iqTmgE-  
  // ClassWizard generated virtual function overrides HM\}C.u  
  //{{AFX_VIRTUAL(CCaptureDlg) U`4t4CHA  
 public: *u34~v16,  
  virtual BOOL PreTranslateMessage(MSG* pMsg); OH5#.${O  
 protected: !NhVPb,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @j r$4pM?  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2$ \#BG  
  //}}AFX_VIRTUAL (>om.FM  
  // Implementation Nm0|U.<  
 protected: cl'qw##  
  HICON m_hIcon; 0te[i*G  
  // Generated message map functions $O9#4A;  
  //{{AFX_MSG(CCaptureDlg) M[Jy?b)  
  virtual BOOL OnInitDialog(); !;U}ax;AF  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); *pGbcBQ  
  afx_msg void OnPaint(); y(r(q  
  afx_msg HCURSOR OnQueryDragIcon(); Ed"p|5~  
  virtual void OnCancel(); ;uU 8$  
  afx_msg void OnAbout(); 4=;`\-7!  
  afx_msg void OnBrowse();  %B#8  
  afx_msg void OnChange(); {<Vw55)#0Q  
 //}}AFX_MSG OFlY"O S[  
 DECLARE_MESSAGE_MAP() &Mh]s\  
}; 2CPh'7|l  
#endif T "t%>g  
Znh<r[p<  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file z0tm3ovp  
#include "stdafx.h" {,o 0N\(  
#include "Capture.h" sCAWrbOe>  
#include "CaptureDlg.h" X4v0>c  
#include <windowsx.h> OWHHN<  
#pragma comment(lib,"hook.lib") GplEad $  
#ifdef _DEBUG dMH}%f5;1  
#define new DEBUG_NEW ]*AQT7PH  
#undef THIS_FILE !2g*=oY  
static char THIS_FILE[] = __FILE__; Y{dj~}mM+  
#endif )!D,;,aQ  
#define IDM_SHELL WM_USER+1 #Bas+8 @,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {X&H  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,-Yl%R.W=  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; O ;B[ZMV  
class CAboutDlg : public CDialog }xy[ &-dh  
{ 6.QzT(  
 public: .u9,w  
  CAboutDlg(); 0qo :M3  
  // Dialog Data D +9l$**a  
  //{{AFX_DATA(CAboutDlg) *f+DV[DF  
  enum { IDD = IDD_ABOUTBOX }; R-Z)0S'ZR  
  //}}AFX_DATA {cAGOxwd  
  // ClassWizard generated virtual function overrides 7brC@+ZD  
  //{{AFX_VIRTUAL(CAboutDlg) RZ:= ';  
 protected: &B ^LaRg  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support IaR D"oCH  
  //}}AFX_VIRTUAL ,tHV H7[  
  // Implementation 6t`cY  
 protected: )ocr.wU@  
  //{{AFX_MSG(CAboutDlg) _2S( *  
  //}}AFX_MSG ft 4(^|~  
  DECLARE_MESSAGE_MAP() 32,Y 3!%  
}; ;[[oZ  
XXPpj< c  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) V3> JZH`  
{ 4#w Z#}  
 //{{AFX_DATA_INIT(CAboutDlg) ,CQg6- [  
 //}}AFX_DATA_INIT - |&&lxrwh  
} hxuc4C\J  
:pgpE0  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) &qae+p?  
{ [#C(^J*@c  
 CDialog::DoDataExchange(pDX); .L}k-8  
 //{{AFX_DATA_MAP(CAboutDlg) 5'[b:YC  
 //}}AFX_DATA_MAP #qdfr3  
} CR'1,  
j q1 |`:  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Meo. V|1  
 //{{AFX_MSG_MAP(CAboutDlg) /~;om\7r  
 // No message handlers D1 f}g  
 //}}AFX_MSG_MAP w|8T6W|w  
END_MESSAGE_MAP() ORo,.#<  
(<xl _L:*.  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) xr1,D5  
: CDialog(CCaptureDlg::IDD, pParent) TKZ[H$Z  
{ W(,3j{d2i  
 //{{AFX_DATA_INIT(CCaptureDlg) $~<]G)*Z  
  m_bControl = FALSE; '/QS sZR  
  m_bAlt = FALSE; EHX/XM  
  m_bShift = FALSE; @PyZ u7'  
  m_Path = _T("c:\\"); jq12,R2+)  
  m_Number = _T("0 picture captured."); #>dj!33  
  nCount=0; FkY <I]F  
  bRegistered=FALSE; <K zEn+  
  bTray=FALSE; , FD RU  
 //}}AFX_DATA_INIT  MON]rj7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 *'hJ5{U  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 6 ly`lu9  
} R&]#@PW^  
*32hIiCm  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) =/MA`>  
{ jdAjCy;s!  
 CDialog::DoDataExchange(pDX); BXB ZX@jVk  
 //{{AFX_DATA_MAP(CCaptureDlg) 7Nt6}${=z  
  DDX_Control(pDX, IDC_KEY, m_Key); [e;c)XS[  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); cMp#_\B  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 8a3h)R  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 6h:2,h pE  
  DDX_Text(pDX, IDC_PATH, m_Path); Av_JcH  
  DDX_Text(pDX, IDC_NUMBER, m_Number); g! DJ W  
 //}}AFX_DATA_MAP YzVhNJWpw  
} ![j?/376  
IcP\#zhEv  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) &*8_w-  
//{{AFX_MSG_MAP(CCaptureDlg) VQwF9Iq]`  
 ON_WM_SYSCOMMAND() Z=j6c"  
 ON_WM_PAINT() o3=pxU*  
 ON_WM_QUERYDRAGICON() ~"nF$DB  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 6-J%Z%yT #  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 'j(F=9)  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 'Uu!K!  
//}}AFX_MSG_MAP )4e?-?bK!  
END_MESSAGE_MAP() AS'%Md&I  
Ws*UhJY<GS  
BOOL CCaptureDlg::OnInitDialog() =a^}]k}  
{ &ws^Dm]R  
 CDialog::OnInitDialog(); LeaJ).Maw  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); FDCc?>,o  
 ASSERT(IDM_ABOUTBOX < 0xF000); On-zbE  
 CMenu* pSysMenu = GetSystemMenu(FALSE); X_aC$_b  
 if (pSysMenu != NULL) R]<N";-  
 { jiqE^j3;  
  CString strAboutMenu; !N'HL-oT  
  strAboutMenu.LoadString(IDS_ABOUTBOX); |Q?^Ba  
  if (!strAboutMenu.IsEmpty()) XDohfa _  
  { }ej>uZVe<  
   pSysMenu->AppendMenu(MF_SEPARATOR); &hu>yH>j  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ~kFL[Asnaf  
  } F_F02:t  
 } ! 8*l U2  
 SetIcon(m_hIcon, TRUE); // Set big icon ]I'dnd3e  
 SetIcon(m_hIcon, FALSE); // Set small icon O QGKH6q  
 m_Key.SetCurSel(0); y,s`[=CT  
 RegisterHotkey(); h yK&)y?~  
 CMenu* pMenu=GetSystemMenu(FALSE); i8->3uB  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,9Si 3vn  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); D1R$s*{  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); uN8RG_Mb  
 return TRUE; // return TRUE unless you set the focus to a control W.CbNou  
} dJ>~  
qV7 9bK  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) g+A>Bl3#  
{ O+OUcMa,  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ACOn}yH  
 { gE: ?C2  
  CAboutDlg dlgAbout; ^:~!@$*;6  
  dlgAbout.DoModal(); A~}5T%qb  
 } ]p!)8[<  
 else QTC!vKM  
 { a'Yi^;2+\  
  CDialog::OnSysCommand(nID, lParam); %z~=Jz^  
 } 55Ya(E  
} 7zq@T]  
Kv9Z.DY  
void CCaptureDlg::OnPaint() fPPC`d&Q3  
{ ir|c<~_=  
 if (IsIconic()) Kk`Lu S?  
 { r4mz   
  CPaintDC dc(this); // device context for painting \zKO5,qw  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); &P7Z_&34Z  
  // Center icon in client rectangle !|\l*  
  int cxIcon = GetSystemMetrics(SM_CXICON); }Xvm( ;  
  int cyIcon = GetSystemMetrics(SM_CYICON); %+^Qs\j  
  CRect rect; zf;sdQ;4  
  GetClientRect(&rect); '^)}"sZ@G  
  int x = (rect.Width() - cxIcon + 1) / 2; U0Uy C  
  int y = (rect.Height() - cyIcon + 1) / 2; EKus0"|  
  // Draw the icon 1xI  
  dc.DrawIcon(x, y, m_hIcon); $b(CN+#  
 } g%<n9AUl  
 else ]f_`w81[  
 { h0$Y;=YA  
  CDialog::OnPaint(); 6EeO\Qj{  
 } |j~l%d*<w  
} _"*}8{|  
vUCmm<y  
HCURSOR CCaptureDlg::OnQueryDragIcon() ;5DDV6  
{ \PWH( E9  
 return (HCURSOR) m_hIcon; ;y_]w6|n  
} S5V:HRj{?  
"hi03k  
void CCaptureDlg::OnCancel() 4Cv*zn  
{ b~qH/A}h  
 if(bTray) hd6O+i Y4  
  DeleteIcon(); ?lML+  
  CDialog::OnCancel(); %&S9~E D  
} .,20_<j%=  
#q 4uS~  
void CCaptureDlg::OnAbout() d f!i}L  
{ ^t:dcY7  
 CAboutDlg dlg; 2RQ- L  
 dlg.DoModal(); H@1}_d  
} Lw2VdFi>E&  
stUUez>  
void CCaptureDlg::OnBrowse() &d0sv5&s  
{ 4jt(tZS  
 CString str; mRa\ wEg%  
 BROWSEINFO bi; oKb"Ky@s  
 char name[MAX_PATH]; T+^c=[W  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); c]zFZJ6M  
 bi.hwndOwner=GetSafeHwnd(); 3{f g3?  
 bi.pszDisplayName=name; W.NZ%~|+e/  
 bi.lpszTitle="Select folder"; <{GVA0nr  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; yM~bUmSg  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); FWA?mde  
 if(idl==NULL) ]IEZ?+F,  
  return; <z\`Ma  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?U{<g,^  
 str.ReleaseBuffer(); ^GyZycch  
 m_Path=str; }B a_epM  
 if(str.GetAt(str.GetLength()-1)!='\\') em'ADRxG+  
  m_Path+="\\"; -]+pwZ4g  
 UpdateData(FALSE); "F%JZO51  
} M~N/er  
SnR2o3r-Of  
void CCaptureDlg::SaveBmp() U (#JC(E-#  
{ iGkysU<wcp  
 CDC dc; le]~Cy0  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); %IZd-N7i^  
 CBitmap bm; uKXNzz  
 int Width=GetSystemMetrics(SM_CXSCREEN); nwh@F1|  
 int Height=GetSystemMetrics(SM_CYSCREEN); ^sB0$|DU  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 3H`{ A/r  
 CDC tdc; vENf3;o0  
 tdc.CreateCompatibleDC(&dc); mf)+ 5On  
 CBitmap*pOld=tdc.SelectObject(&bm); xP!QV~$>  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); %4f.<gz~r|  
 tdc.SelectObject(pOld); ~`C _B]3|  
 BITMAP btm; O`Gq7=X  
 bm.GetBitmap(&btm); vaGF(hfTA  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; N@L{9ak1  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); e"52'zAV-  
 BITMAPINFOHEADER bih; ~7U~   
 bih.biBitCount=btm.bmBitsPixel; r4fHD~#l{  
 bih.biClrImportant=0; c(e>Rmh  
 bih.biClrUsed=0; p |1u,N  
 bih.biCompression=0; h='F,r5#2  
 bih.biHeight=btm.bmHeight; # )y/aA  
 bih.biPlanes=1; [ r8 ZAS  
 bih.biSize=sizeof(BITMAPINFOHEADER); U!`iKy-  
 bih.biSizeImage=size; B+snHabS6  
 bih.biWidth=btm.bmWidth; !TJ,:c]4{!  
 bih.biXPelsPerMeter=0; C!a1.&HHZ7  
 bih.biYPelsPerMeter=0; Hddc-7s  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); kQ}n~Hn  
 static int filecount=0; 94?WL  
 CString name; dWPQp*f2  
 name.Format("pict%04d.bmp",filecount++); `r-jWK\  
 name=m_Path+name; i*Ldec^  
 BITMAPFILEHEADER bfh; k%sH09   
 bfh.bfReserved1=bfh.bfReserved2=0; 2h'Wu qO  
 bfh.bfType=((WORD)('M'<< 8)|'B'); *Ud(HMTe  
 bfh.bfSize=54+size; \7uM5 k}l  
 bfh.bfOffBits=54; {VE h@yn  
 CFile bf; z.!N|"4yr  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ L_NiU;cr%  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); e[fOm0^.c  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); *B"Y]6$  
  bf.WriteHuge(lpData,size); <ZF|2  
  bf.Close(); <"J]u@|  
  nCount++; G$+v |z  
 } $KO2+^%y  
 GlobalFreePtr(lpData); LWN {  
 if(nCount==1) jb -kg</A  
  m_Number.Format("%d picture captured.",nCount); 67YC;J]n=z  
 else =d<RgwscJ  
  m_Number.Format("%d pictures captured.",nCount); q.VYPkEib  
  UpdateData(FALSE); (Z SaAn),  
} 1!~cPD'F  
a+E&{p V  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Ki2!sADd  
{ UtQey ;w  
 if(pMsg -> message == WM_KEYDOWN)  ir6' \  
 { *[3xc*5F/A  
  if(pMsg -> wParam == VK_ESCAPE) _!R$a-  
   return TRUE; 15\m.Ix  
  if(pMsg -> wParam == VK_RETURN) ^AS \a4`/  
   return TRUE; :x)H!z P  
 } #Ub_m@@ 4  
 return CDialog::PreTranslateMessage(pMsg); Z[oEW>_A  
} lUm(iYv;H  
DPTk5o[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .$%p0Yx+  
{ ,erf{"Nh  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ s9;6&{@%wO  
  SaveBmp(); .B# .   
  return FALSE; (Q^sK\  
} 0N.h:21(4  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ !hBpon  
 CMenu pop; Yf w>x[#e  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ?m |}}a  
 CMenu*pMenu=pop.GetSubMenu(0); GQqGrUQ*}  
 pMenu->SetDefaultItem(ID_EXITICON); 6lSz/V;  
 CPoint pt; CWn\K R  
 GetCursorPos(&pt); sUZA!sv  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); EiL#Dwx  
 if(id==ID_EXITICON) xc:E>-  
  DeleteIcon(); PgWWa*Ew  
 else if(id==ID_EXIT) 9CY{}g  
  OnCancel(); V&M*,#(?  
 return FALSE; 3'0Pl8  
} _rT\?//B  
LRESULT res= CDialog::WindowProc(message, wParam, lParam);  `Vb  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ]:<! (  
 AddIcon(); h[ DNhR  
 return res; T{k P9 4  
} <v:VA!]  
5ilGWkb`'X  
void CCaptureDlg::AddIcon() tnRf!A;m  
{ oJz2-P mX  
 NOTIFYICONDATA data; n|w+08c"  
 data.cbSize=sizeof(NOTIFYICONDATA); 1F^Q*t{  
 CString tip; 9-KhJq%  
 tip.LoadString(IDS_ICONTIP); }}AIpYp,P  
 data.hIcon=GetIcon(0); ^Xk!wJ  
 data.hWnd=GetSafeHwnd(); I&;>(@K  
 strcpy(data.szTip,tip); .f\LzZ-I:  
 data.uCallbackMessage=IDM_SHELL; .Pc>1#z&[  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; t4WB^dHYp  
 data.uID=98; 5p;AON  
 Shell_NotifyIcon(NIM_ADD,&data); a1U|eLmUb  
 ShowWindow(SW_HIDE); M"~jNe|  
 bTray=TRUE; ;b$P*dSG}  
} Dqx#i-L23  
x sryXex;  
void CCaptureDlg::DeleteIcon() I`kfe`_  
{ 9DxHdpOk  
 NOTIFYICONDATA data; w,LtQhQ  
 data.cbSize=sizeof(NOTIFYICONDATA); CLR1 CGnn7  
 data.hWnd=GetSafeHwnd(); O VV@  
 data.uID=98; m[9.'@ ye  
 Shell_NotifyIcon(NIM_DELETE,&data); 06&J!,p :  
 ShowWindow(SW_SHOW); :C~Ar]  
 SetForegroundWindow(); Ot t6y  
 ShowWindow(SW_SHOWNORMAL); 5)k8(kH  
 bTray=FALSE; uN|A}/hr]  
} `g)}jo`W  
Bt+^H6cb  
void CCaptureDlg::OnChange() $)i`!7`4=  
{ 3o<d= @`r  
 RegisterHotkey(); e~o!Qm  
} u6qK4*eAD  
]?eZDf~  
BOOL CCaptureDlg::RegisterHotkey() q2qi~}l  
{ 6j<9Y  
 UpdateData(); M tN>5k c  
 UCHAR mask=0; oaY_6  
 UCHAR key=0; ;O"?6d0  
 if(m_bControl) TR"C<&y$j  
  mask|=4; 3[YG BM(  
 if(m_bAlt) v, $r.g;  
  mask|=2; t un}rdb  
 if(m_bShift) t&r.Kf9Z\  
  mask|=1; $^Fl*:6  
  key=Key_Table[m_Key.GetCurSel()]; p=8Qv  
 if(bRegistered){ *;7y5ZJ  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 'solCAy  
  bRegistered=FALSE; :cT)M(o  
 } ~P4C`Q1PT#  
 cMask=mask; $*Ucfw1T  
 cKey=key; /F*Y~>*% 1  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); h [TwaR  
 return bRegistered; h3ygL"k  
} jh5QIZf=  
NVyBEAoh  
  四、小结 w_9^YO! !  
JzyCeM =  
  本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。
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