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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: S/ODq L|  
  5 ({t4dm  
  一、实现方法 *U]V@;XF  
"F.;Dv9V[0  
  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: .R./0Ot tx  
v,4pp@8rv  
#pragma data_seg("shareddata") 3 %|86:*  
HHOOK hHook =NULL; //钩子句柄 3P^sM1  
UINT nHookCount =0; //挂接的程序数目 'F$l{iR  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 PEuIWXr  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 7,lq}a8z  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey .[3Z1v,  
static int KeyCount =0; zY('t!u8  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 WqXbI4;pJ  
#pragma data_seg() H=Y{rq@  
:=\Hoz  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 E~gyy]8&  
f,:9N5Z  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: Ire\i7MF:  
Z3& _  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR j{9D{  
cKey,UCHAR cMask) nAjO6g6E  
{ 2|}+T6_q  
 BOOL bAdded=FALSE; glF; e T  
 for(int index=0;index<MAX_KEY;index++){ Y<Fz)dQo  
  if(hCallWnd[index]==0){ qIIv6''5@  
   hCallWnd[index]=hWnd; h?8]C#6^  
   HotKey[index]=cKey; <\}KT*Xp  
   HotKeyMask[index]=cMask; H P3lz,d  
   bAdded=TRUE; w6W}"Uw  
   KeyCount++; /|eA9 ]  
   break; jg\Z;_!W  
  } ZfgJ.<<  
 } N,;5{y1;J  
 return bAdded; S7L=#+Z  
} Ksy -e{n  
//删除热键 j&Wl0  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >w^YO25q  
{ vWf; 'j  
 BOOL bRemoved=FALSE; "t_-f7fS7  
 for(int index=0;index<MAX_KEY;index++){ U}PiY"S<  
  if(hCallWnd[index]==hWnd){ :"I E  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ s8#X3Rp  
    hCallWnd[index]=NULL; !Y\D?rKZ  
    HotKey[index]=0; <RG|Dx[:=  
    HotKeyMask[index]=0; 0Pe>Es|^A#  
    bRemoved=TRUE; NF0%}II&xK  
    KeyCount--; o)2W`i&  
    break; \DD0s8  
   } thvYL.U :  
  } {'2@(^3  
 } o17ekML  
 return bRemoved; 3 "Q=Vl"  
} [>1OJY.S}T  
%e(z /"M=`  
6N;wqn  
  DLL中的钩子函数如下: -OA?BEQ=I  
0#S W!b|%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) K?zH35f$  
{ )l[M Q4vWW  
 BOOL bProcessed=FALSE; ;Mpy#yIU.  
 if(HC_ACTION==nCode)  $W9{P;  
 { $[/&74#0HX  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 JZD[NZ<  
   switch(wParam) t7?Zxq  
   {  `P8Vh+7u  
    case VK_MENU: g47-db"5  
     MaskBits&=~ALTBIT; de;GrPLAi  
     break; 846$x$G4  
    case VK_CONTROL: y?a Acn$  
     MaskBits&=~CTRLBIT; 3rcKzS7  
     break; X90J!  
    case VK_SHIFT: r.>].~}4  
     MaskBits&=~SHIFTBIT; Z<SLc,]^  
     break; JA'h4AXk  
    default: //judge the key and send message %JHGiCv|  
     break; R%qGPO5Z\c  
   } [-;_ZFS{  
   for(int index=0;index<MAX_KEY;index++){ JNa"8  
    if(hCallWnd[index]==NULL) 72Iy^Y[MX  
     continue; "Za >ZRR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k=B] &F  
    { (jFGa2{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); G1"zElug  
     bProcessed=TRUE; 0DmMG  
    } tdSfi<y5I  
   } Ar:*oiU  
  } jp"JafS/E  
  else if((lParam&0xc000ffff)==1){ //有键按下 L?Qg#YSd ~  
   switch(wParam) ( |PAx (  
   { \CXQo4P  
    case VK_MENU: 3`B6w$z>(  
     MaskBits|=ALTBIT; n;$5Cq!v=  
     break;  ?kZTI (  
    case VK_CONTROL: {FIXc^m'  
     MaskBits|=CTRLBIT; )6Ny1x+  
     break; 2cqI[t@0  
    case VK_SHIFT: x7<\] 94  
     MaskBits|=SHIFTBIT; =}v}my3y"  
     break; L2pp6bW  
    default: //judge the key and send message )d$glI+  
     break; H N.3  
   } u\LFlX0sO  
   for(int index=0;index<MAX_KEY;index++){ q|v(Edt|_[  
    if(hCallWnd[index]==NULL) ]"1`+q6i  
     continue; I-WhH>9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0em#-*|2"  
    { YR>B_,Gl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); B,K>rCZ/  
     bProcessed=TRUE; FcRW;e8-  
    } _jNj-)RB_  
   } v}tag#f5>?  
  } @ W^| ?  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 P  '>SmQ  
   for(int index=0;index<MAX_KEY;index++){ $T`<Qq-r  
    if(hCallWnd[index]==NULL) =ZDAeVz3w  
     continue; sm\f0P!rv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) F^5?\  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); sp5eVAd  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Tjl:|F8  
   } .GsO.#p{  
  } #ceaZn|@m  
 } VsN pHQG]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 1\g6)|R-+  
} 0\:(ageY?  
F6K4#t+9  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: t: IN,Kl4  
E/09hD Q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Mnz!nWhk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 98WZ){+,m  
2A\,-*pc  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: )QG<f{wS  
;Wl+ zw  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >2Jdq  
{ ^ mS o1?<  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) sz)oZPu|  
 { uFLx  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Z0*ljT5|  
  SaveBmp(); g=]u^&  
  return FALSE; L}FO jrN  
 } sL@U  
 …… //其它处理及默认处理 sPpsq  
} Wa1, p  
dpFVN[\oK  
,uPJ_oZs  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 _^ 'I  
V`RNM%Y  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 :pF_GkG  
a?6a b+7#  
  二、编程步骤 qKE:3g35  
9!Ar`Io2@  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; \MmI`$  
w 1Ec_y{  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; >^Yq|~[  
sk 2-5S  
  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; IhBp%^H0-  
N*`b%XGn3  
  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; +Ag!?T  
vi|R(&  
  5、 添加代码,编译运行程序。 kdCP  
 (:";i&  
三、程序代码 `KCh*i  
Da v PYg  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL d5>H3D{49  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) (C\hVy2X?N  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ jC3Vbm&ZZ  
#if _MSC_VER > 1000 P{5-Mx!{&  
#pragma once 6}(J6T46M[  
#endif // _MSC_VER > 1000 p<&Xd}]"^W  
#ifndef __AFXWIN_H__ @0eHS +  
#error include 'stdafx.h' before including this file for PCH <N`J`J-[  
#endif #_|sgS?1  
#include "resource.h" // main symbols K3' niGT  
class CHookApp : public CWinApp p?2Y }9  
{ d~?X/sJ t  
 public: (s1k$@d  
  CHookApp(); Z{ u a=0  
  // Overrides $F/EJ>  
  // ClassWizard generated virtual function overrides [tH-D$V  
  //{{AFX_VIRTUAL(CHookApp) A 5+rd{k/  
 public: JGFt0He]  
  virtual BOOL InitInstance(); =fYL}m5E  
  virtual int ExitInstance(); je6CDFqw  
  //}}AFX_VIRTUAL p[@5&_u(z  
  //{{AFX_MSG(CHookApp) < n:}kQTT  
  // NOTE - the ClassWizard will add and remove member functions here. Zo}y(N1K}  
  // DO NOT EDIT what you see in these blocks of generated code ! rx5B=M  
  //}}AFX_MSG xy<`#  
  DECLARE_MESSAGE_MAP() 90# ;?#  
}; I"t(%2*q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); v @O&t4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); V=X:=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ; h`0ir4[A  
BOOL InitHotkey(); )m&U#S _;  
BOOL UnInit(); H%1$,]F  
#endif Maqf[ Vky  
p)=~% 7DV  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. YqV8D&I  
#include "stdafx.h" 4:sjH.u<  
#include "hook.h" oM)h#8bq  
#include <windowsx.h> "iM~Hy  
#ifdef _DEBUG K 9kUS  
#define new DEBUG_NEW NB7Y{) w  
#undef THIS_FILE .,i(2^  
static char THIS_FILE[] = __FILE__; *1'`"D~  
#endif jV/CQM5a+  
#define MAX_KEY 100 >;#=gM  
#define CTRLBIT 0x04 \NG C$p n  
#define ALTBIT 0x02 8LI-gp\ 2  
#define SHIFTBIT 0x01 {Rear 2  
#pragma data_seg("shareddata") JI/_ce  
HHOOK hHook =NULL; X>I)~z}9#  
UINT nHookCount =0; a|BcnYN  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey $x#FgD(iI  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT D&ve15wL  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey /oL;YIoQX  
static int KeyCount =0;  x-'~Bu  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift XG@`ZJhU6  
#pragma data_seg() J@ L9p46,  
HINSTANCE hins; S|zW^|YU  
void VerifyWindow(); Z Dhx5SL&  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) !~ZP{IXyo  
//{{AFX_MSG_MAP(CHookApp) m,R Dr  
// NOTE - the ClassWizard will add and remove mapping macros here. jDRe)bo4  
// DO NOT EDIT what you see in these blocks of generated code! nq1 9Q)  
//}}AFX_MSG_MAP %Td )0Lqp  
END_MESSAGE_MAP() vNW jH!'  
ZL< MC~  
CHookApp::CHookApp() \#rO!z d  
{ CN2_bz  
 // TODO: add construction code here, P0i V<T4^  
 // Place all significant initialization in InitInstance phYDs9-K  
} /U$8TT8+-  
45@]:2j  
CHookApp theApp; 5y} v{Ijt  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) !$g+F(:(c  
{ 0fs$#j  
 BOOL bProcessed=FALSE; >qo~d?+  
 if(HC_ACTION==nCode) 7 yt=]1  
 { m7%C#+67  
  if((lParam&0xc0000000)==0xc0000000){// Key up d"U(`E=H9  
   switch(wParam) #g5^SR|qE  
   { o\`>c:.  
    case VK_MENU: GOSI3RRn  
     MaskBits&=~ALTBIT; _0pO8o-x  
     break; q+a.G2S  
    case VK_CONTROL: Qpt&3_   
     MaskBits&=~CTRLBIT; zTD@  
     break; <8 #ObdY!  
    case VK_SHIFT: r,N[)@  
     MaskBits&=~SHIFTBIT; nW+YOX|+  
     break; a45 ss7  
    default: //judge the key and send message ^# A.@  
     break; ~/IexQB&  
   } m~],nl  
   for(int index=0;index<MAX_KEY;index++){ n^hocGH*  
    if(hCallWnd[index]==NULL) quo^fqS&a  
     continue; 6`$[Ini  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *]x*B@RF  
    { E4D (,s  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~SjZk|  
     bProcessed=TRUE; nMoWOP'  
    } pGIe=Um0W  
   } [rreFSy#@  
  } h7;bclU  
  else if((lParam&0xc000ffff)==1){ //Key down ]$M<]w,IJ2  
   switch(wParam) ]]cYLaq(  
   { eeUp 1g  
    case VK_MENU: ze'.Y%]  
     MaskBits|=ALTBIT; fA^7^0![  
     break; 5]jIg < j  
    case VK_CONTROL: `BnP[jF  
     MaskBits|=CTRLBIT; l9/:FiJ_  
     break; 137Xl>nO  
    case VK_SHIFT: (\dK4JJ  
     MaskBits|=SHIFTBIT; 2D([Z-<i  
     break; BN@,/m9OQ%  
    default: //judge the key and send message mEQ!-p   
     break; {$^SP7qV#>  
   } !Zbesp KZ  
   for(int index=0;index<MAX_KEY;index++) >sj bK%  
   { U&y`-@A4  
    if(hCallWnd[index]==NULL) "L3Xd][  
     continue; TRKgBK$,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %HSl)zEo>C  
    { u{bL-a8}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); L"rcv:QWZa  
     bProcessed=TRUE; [}3cDR  
    } V+w u  
   } hkW{88  
  } 16@);Ot  
  if(!bProcessed){ "A]Y~iQ  
   for(int index=0;index<MAX_KEY;index++){ zfjTQMaxh  
    if(hCallWnd[index]==NULL) (:Cc3  
     continue; %^9:%ytt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $Kq<W{H3ut  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); B; -2$ 77  
   } c6b0*!D"}  
  } ZM~`Gd9K0E  
 } el'j&I  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 98*x 'Wp  
} H_X?dj15  
#@Ujx_F  
BOOL InitHotkey() B#tdLv"I  
{ =s'7$D}0.  
 if(hHook!=NULL){ Sue 6+p  
  nHookCount++; {TL +7kiX/  
  return TRUE; Z~3u:[x";  
 } (L|}`  
 else B4O6> '  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); "E>t, D  
  if(hHook!=NULL) p,n\__  
   nHookCount++; |5 xzl  
  return (hHook!=NULL); 3#Y3Dz`  
} Q-R}qy5y  
BOOL UnInit() V_;9TC  
{ `)[dVfxA  
 if(nHookCount>1){ abZdGnc  
  nHookCount--; (5;D7zdA  
  return TRUE; /R%^rz'w  
 } fr#Qz{  
 BOOL unhooked = UnhookWindowsHookEx(hHook); yL"i  
 if(unhooked==TRUE){ #'>?:k  
  nHookCount=0; S!7g)  
  hHook=NULL; iMWW%@U^=  
 } ) p^  
 return unhooked; G\1J _al  
} Lh 9S8EU  
d,R6` i  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Zu=kT}aGg  
{ } gkP  
 BOOL bAdded=FALSE; b%nkIPA  
 for(int index=0;index<MAX_KEY;index++){ 9bEM#Hj  
  if(hCallWnd[index]==0){ VD#!ztcY'  
   hCallWnd[index]=hWnd; bag&BHw  
   HotKey[index]=cKey; pGGV\zD^  
   HotKeyMask[index]=cMask; 6+ 8mV8{-8  
   bAdded=TRUE; \/,g VT  
   KeyCount++; BPWnck=%  
   break; Z}[xQ5  
  } ZT9IMihV  
 } k ]bPI$  
 return bAdded; ? : md  
} @xJCn}`Zj  
] SK[C" S  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6F`\YSn+  
{ <9\,QR)  
 BOOL bRemoved=FALSE; 01nsdZ-  
 for(int index=0;index<MAX_KEY;index++){ -]QguZE  
  if(hCallWnd[index]==hWnd){ C<t RU5|  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ C*O ,rm}  
    hCallWnd[index]=NULL; bpMl =_  
    HotKey[index]=0; M]B3vPA/v  
    HotKeyMask[index]=0; 3G&0Ciet  
    bRemoved=TRUE; ~@YQ,\Y  
    KeyCount--; \[T{M!s  
    break; .Qfnd#  
   } tzNaw %\  
  } Vr\Q`H.  
 } .\)k+ R  
 return bRemoved; qsvpW%?aE  
} OT+Ee  
i7f%^7!  
void VerifyWindow() fqX~xp  
{ *')Q {8`  
 for(int i=0;i<MAX_KEY;i++){ o4'Wr  
  if(hCallWnd!=NULL){ (+x]##Q  
   if(!IsWindow(hCallWnd)){ \=8=wQv  
    hCallWnd=NULL; #gI&lO*\gr  
    HotKey=0; /p}{#DLB  
    HotKeyMask=0; *]'qLL7d  
    KeyCount--; F(E<,l2[  
   } b=_{/F*b?  
  } :p&IX"Hh  
 } <c\]Ct  
} w^ U}|h"  
!^1[ s@1  
BOOL CHookApp::InitInstance() d|3o/@k  
{ +l.|kkZ?  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ` #=fA  
 hins=AfxGetInstanceHandle(); >3+FZ@.iT  
 InitHotkey(); V*~423  
 return CWinApp::InitInstance(); 7g-$oO  
} lDlj+fK  
N GSS:  
int CHookApp::ExitInstance() Pn J*Zea  
{ mb~./.5F  
 VerifyWindow(); Uf^RLdoDn  
 UnInit(); 77^ "xsa  
 return CWinApp::ExitInstance(); ,wlbIl~  
} 1w bTqc  
($:y\,5(9I  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file %GS\1 Q%  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) yFi6jN#~  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ a(5y>HF  
#if _MSC_VER > 1000 EFwL.'Fh  
#pragma once W8x[3,gT  
#endif // _MSC_VER > 1000 gjQ=8&i  
vi<X3G6Xh  
class CCaptureDlg : public CDialog }/4 9T  
{ ?n&$m  
 // Construction H):-! ?:  
 public: 1N>6rN  
  BOOL bTray; `LE^:a:8,  
  BOOL bRegistered; s{cKBau  
  BOOL RegisterHotkey(); p; F2z;#  
  UCHAR cKey; AX8gij  
  UCHAR cMask; >"O1`xdG  
  void DeleteIcon(); |&Au6 3  
  void AddIcon(); ^IYJEqK  
  UINT nCount; fMyE&#}z  
  void SaveBmp(); |@+8]dy:l  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor [qW<D/@  
  // Dialog Data (GnVwJ<v9V  
  //{{AFX_DATA(CCaptureDlg) l`G(O$ct  
  enum { IDD = IDD_CAPTURE_DIALOG }; =p5?+3" @  
  CComboBox m_Key; rQn{L{  
  BOOL m_bControl; "NJ ,0A  
  BOOL m_bAlt; G{/;AK  
  BOOL m_bShift; pK<%<dIc  
  CString m_Path; ,7t3>9 -M"  
  CString m_Number; ;FcExg|k  
  //}}AFX_DATA U%h7h`=F?  
  // ClassWizard generated virtual function overrides 70duk:Ri0  
  //{{AFX_VIRTUAL(CCaptureDlg) (eki X*y  
 public: >H)^6sJ;%b  
  virtual BOOL PreTranslateMessage(MSG* pMsg); {zY`h6d  
 protected: K/Sq2:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .|U4N/XN%q  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); L>0!B8X2  
  //}}AFX_VIRTUAL kpl~/i`4  
  // Implementation >1m)%zt  
 protected: xnT3^ #-h  
  HICON m_hIcon; " \`BPN  
  // Generated message map functions W0C{~|e  
  //{{AFX_MSG(CCaptureDlg) vJ~4D*(]l  
  virtual BOOL OnInitDialog(); s c5\( b  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); tSI& "-   
  afx_msg void OnPaint(); ss/h[4h4h  
  afx_msg HCURSOR OnQueryDragIcon(); DgC3 > yL  
  virtual void OnCancel(); 3Ca \`m)l  
  afx_msg void OnAbout(); nG!&u1*  
  afx_msg void OnBrowse(); KlY,NSlQ  
  afx_msg void OnChange(); g'KzdG`O0  
 //}}AFX_MSG >'eB2  
 DECLARE_MESSAGE_MAP() Z+r%_|kZ  
}; mVa?aWpez  
#endif _yiR h:  
1% asx'^  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file C:rRK*  
#include "stdafx.h" YW'{|9KnI  
#include "Capture.h" t'dHCp}  
#include "CaptureDlg.h" (D0C#<4P  
#include <windowsx.h> 7U&5^s )J  
#pragma comment(lib,"hook.lib") '`9%'f)  
#ifdef _DEBUG 3%_ 4+zd  
#define new DEBUG_NEW txj wZ_p  
#undef THIS_FILE o<Xc,mP  
static char THIS_FILE[] = __FILE__; 6#-6Bh)>4  
#endif oSN8Xn*qr  
#define IDM_SHELL WM_USER+1 8mk}nex  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); a3Z :C!|O'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); mYiSR   
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; UaH26fWs  
class CAboutDlg : public CDialog lTx Y6vi  
{ @c6"RHG9  
 public: kw 6cFz  
  CAboutDlg(); wEBtre7  
  // Dialog Data zt-'SY  
  //{{AFX_DATA(CAboutDlg) 9 %D$T'K  
  enum { IDD = IDD_ABOUTBOX }; f-vZ2+HP  
  //}}AFX_DATA u+I3IdU3  
  // ClassWizard generated virtual function overrides L@>^_p$  
  //{{AFX_VIRTUAL(CAboutDlg) \d `dV0X  
 protected: 9B qQ^`bu  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Fl B, (Cm  
  //}}AFX_VIRTUAL Y8D7<V~Md  
  // Implementation p.@0=)  
 protected: uo]Hi^r.l  
  //{{AFX_MSG(CAboutDlg) S9 $o  
  //}}AFX_MSG 30A`\+^f  
  DECLARE_MESSAGE_MAP() #S@UTJa  
}; )`B -O::  
-Pqi1pj]  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) {z.[tvE8h  
{ f@wsS m  
 //{{AFX_DATA_INIT(CAboutDlg) &sI,8X2a2  
 //}}AFX_DATA_INIT H(X+.R,Thp  
} ]jHgo](%  
,:v.L}+Z  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) &?KPu?9  
{ 4C l, Iw/;  
 CDialog::DoDataExchange(pDX); o}WB(WsG  
 //{{AFX_DATA_MAP(CAboutDlg) I(z>)S'7r  
 //}}AFX_DATA_MAP 4$0jz'  
} A Oby*c  
A8 \U CG  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) @`w'   
 //{{AFX_MSG_MAP(CAboutDlg) B.]qrS|  
 // No message handlers 5u'TmLuKT  
 //}}AFX_MSG_MAP }s`jl` `PM  
END_MESSAGE_MAP() P3+)pOE-SI  
UiJ^~rn  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) *Gg1h@&  
: CDialog(CCaptureDlg::IDD, pParent) di-O*ug  
{ Aivu%}_|  
 //{{AFX_DATA_INIT(CCaptureDlg) _ff=B  
  m_bControl = FALSE; DCEvr"(  
  m_bAlt = FALSE; ]NaMZ  
  m_bShift = FALSE; y3&Tv  
  m_Path = _T("c:\\"); c'4>D,?1  
  m_Number = _T("0 picture captured."); @?<N +qdH>  
  nCount=0; &/B2)l6a  
  bRegistered=FALSE; yf `.%  
  bTray=FALSE; 3S[w'  
 //}}AFX_DATA_INIT Fv?R\`52u  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 8vz_~p9%j  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); r!{w93rPX  
} SRA|7g}7W  
4q\.I +r^  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) qWRNHUd  
{ %00k1 *$  
 CDialog::DoDataExchange(pDX); Jo6~r-  
 //{{AFX_DATA_MAP(CCaptureDlg) ]I{qp~^#n  
  DDX_Control(pDX, IDC_KEY, m_Key); n.2E8m/  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 3v9gb,)y\  
  DDX_Check(pDX, IDC_ALT, m_bAlt); uS! 35{.>  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 1$='`@8I  
  DDX_Text(pDX, IDC_PATH, m_Path); t 3(%UB  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ](B& l{V  
 //}}AFX_DATA_MAP [47K7~9p  
} ^>,< *p  
t x:rj6 -z  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) jw:4fb  
//{{AFX_MSG_MAP(CCaptureDlg) h]J&A  
 ON_WM_SYSCOMMAND() D%c7JK  
 ON_WM_PAINT() w?V[[$  
 ON_WM_QUERYDRAGICON() p/\$P=  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) rK(x4]I l"  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 8w{#R{w  
 ON_BN_CLICKED(ID_CHANGE, OnChange) xm%[}Dt]  
//}}AFX_MSG_MAP TEaD-mY3  
END_MESSAGE_MAP() jjS{q,bo  
f_i"/xC-/  
BOOL CCaptureDlg::OnInitDialog() `-72>F;T  
{ /RA1d<~$q  
 CDialog::OnInitDialog(); jSeA %Te  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); $I}Hk^X  
 ASSERT(IDM_ABOUTBOX < 0xF000); veYsctK~  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 4b3F9  
 if (pSysMenu != NULL) W2r6jm!  
 { QrNL7{  
  CString strAboutMenu; L|]w3}ZT@  
  strAboutMenu.LoadString(IDS_ABOUTBOX); nLFx/5sL  
  if (!strAboutMenu.IsEmpty()) G1#Bb5q:  
  { <FUqD0sQ  
   pSysMenu->AppendMenu(MF_SEPARATOR); )Dk0V!%N  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); } #\;np  
  } (n":] 8}  
 } -!C Y,'3  
 SetIcon(m_hIcon, TRUE); // Set big icon _V_8p)%  
 SetIcon(m_hIcon, FALSE); // Set small icon b2/N H1A  
 m_Key.SetCurSel(0); [#hl}q(P#  
 RegisterHotkey(); APHtJoS  
 CMenu* pMenu=GetSystemMenu(FALSE); LH3N}J({  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); *!r\GGb  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 66^1&D"  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 1^x2WlUm4  
 return TRUE; // return TRUE unless you set the focus to a control E]u'MX  
} .gM>FUH3L  
L#7)X5a__  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) lJ2|jFY9  
{ A]tf>H#1  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) +2;#9aa I  
 { e\d5SKY  
  CAboutDlg dlgAbout; {0A[v}X ~  
  dlgAbout.DoModal(); ? !oVf>  
 } -~<q,p"e  
 else }QWTPRn  
 { RKo P6LGw  
  CDialog::OnSysCommand(nID, lParam); :{wsd$Qlj  
 } 0XQ".:+h  
} LRCS)UBY(.  
zgq_0w~X  
void CCaptureDlg::OnPaint() MUCJ/GF*  
{ v' 9(et  
 if (IsIconic()) c5=v`hv  
 { aCUV[CPw  
  CPaintDC dc(this); // device context for painting Zeme`/aBb  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); VJ6>3  
  // Center icon in client rectangle 8H 3!; ]  
  int cxIcon = GetSystemMetrics(SM_CXICON); q5I4'6NF  
  int cyIcon = GetSystemMetrics(SM_CYICON); +QXYU8bYZ  
  CRect rect; uwH)/BW)[  
  GetClientRect(&rect); EMW4<na[  
  int x = (rect.Width() - cxIcon + 1) / 2; 9p[W :)P4d  
  int y = (rect.Height() - cyIcon + 1) / 2; 7uv/@(J"$  
  // Draw the icon 8JtI&aH-L  
  dc.DrawIcon(x, y, m_hIcon); Z0F>"Z _qn  
 } TN |{P  
 else FQ9csUjpB  
 { NqQ(X'W7  
  CDialog::OnPaint(); Hz3 S^o7  
 } $@u^Jt, ?  
} PFDWC3<  
t5X^(@q4N  
HCURSOR CCaptureDlg::OnQueryDragIcon() CJ}@R.Zy  
{ /4"S}P>f  
 return (HCURSOR) m_hIcon; xPfnyAo?%z  
} O&?CoA?  
\6`%NhkM_  
void CCaptureDlg::OnCancel() ?2<6#>(7a  
{ Ltic_cjYd?  
 if(bTray) Ghgv RR$  
  DeleteIcon(); St7D.|  
  CDialog::OnCancel(); 1)/T.q<D"  
} ktw!T{  
tZNad  
void CCaptureDlg::OnAbout() Yyo9{4v+p{  
{ B yy-Cc  
 CAboutDlg dlg; o. V0iS]  
 dlg.DoModal(); hyvV%z Z  
} E9Xk8w'+  
/_k hFw  
void CCaptureDlg::OnBrowse() ,],JI|Rl8c  
{ UwL"%0u  
 CString str; jzJ1+/9  
 BROWSEINFO bi; L yA(.  
 char name[MAX_PATH]; e\ l,gQP  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); S)'q:`tZo  
 bi.hwndOwner=GetSafeHwnd(); vZ nO  
 bi.pszDisplayName=name; $MJDB  
 bi.lpszTitle="Select folder"; tls6rto  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; S^Wqa:;  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 2GD mZl  
 if(idl==NULL) F&L?J_=  
  return; qT<qu(V:  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); rCSG@D.  
 str.ReleaseBuffer(); {ZsWZJ!  
 m_Path=str; 8F\Msx  
 if(str.GetAt(str.GetLength()-1)!='\\') Acq>M^E3  
  m_Path+="\\"; ^0ZKHR(}e  
 UpdateData(FALSE); j=jrzG+`  
} E'BH7JV  
Znh uIA AG  
void CCaptureDlg::SaveBmp() KEVy%AP=*h  
{ rd 35)  
 CDC dc; !DX/^b  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); $Z7|t  
 CBitmap bm; 6m{$rBR  
 int Width=GetSystemMetrics(SM_CXSCREEN); 3~3(G[w  
 int Height=GetSystemMetrics(SM_CYSCREEN); dI0>m:RBz  
 bm.CreateCompatibleBitmap(&dc,Width,Height); hA,rSq  
 CDC tdc; q=0{E0@9({  
 tdc.CreateCompatibleDC(&dc); #L4Kwy  
 CBitmap*pOld=tdc.SelectObject(&bm); SiuO99'nV  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); |b'<XQ&l5  
 tdc.SelectObject(pOld); k89gJ5B$  
 BITMAP btm; (+Kof  
 bm.GetBitmap(&btm); hq8/`u YF  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; zUUxxS_?  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); _~S^#ut+  
 BITMAPINFOHEADER bih; VF!kr1n!  
 bih.biBitCount=btm.bmBitsPixel; ^1Zq0  
 bih.biClrImportant=0; p|9ECdU>;  
 bih.biClrUsed=0; Z=t#*"J  
 bih.biCompression=0; #&2N,M!Q  
 bih.biHeight=btm.bmHeight; sv{0XVn+^  
 bih.biPlanes=1; Z Lio8  
 bih.biSize=sizeof(BITMAPINFOHEADER); MoR-8vnJ  
 bih.biSizeImage=size; _M]rH<h  
 bih.biWidth=btm.bmWidth; f_P+qm  
 bih.biXPelsPerMeter=0; Oi%~8J>  
 bih.biYPelsPerMeter=0; > %cWTC  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 9@z|2z2\G  
 static int filecount=0; $?A Uk  
 CString name; dZiWVa  
 name.Format("pict%04d.bmp",filecount++); }Ka.bZS  
 name=m_Path+name; 2hA66ar{$  
 BITMAPFILEHEADER bfh; +i_f.Ipp  
 bfh.bfReserved1=bfh.bfReserved2=0; / -qt}  
 bfh.bfType=((WORD)('M'<< 8)|'B'); X$h~d8@r  
 bfh.bfSize=54+size; |XdrO  
 bfh.bfOffBits=54; H.mQbD`X  
 CFile bf; @61N[  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ _BLSI8!N@  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); >5vl{{,$K  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); er7/BE&  
  bf.WriteHuge(lpData,size); 09;'z  
  bf.Close(); |9"^s x  
  nCount++; =|V]8 tN  
 } f!8m  
 GlobalFreePtr(lpData); N9h@1'>  
 if(nCount==1) |&RX>UW$W  
  m_Number.Format("%d picture captured.",nCount); [#rdfN'?U  
 else eKFc W5O  
  m_Number.Format("%d pictures captured.",nCount); (xSi6EZ6;  
  UpdateData(FALSE); 8qYGlew,  
} %b%<g%@i  
$No>-^ )  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) |e; z"-3  
{ >iWf7-:  
 if(pMsg -> message == WM_KEYDOWN) Cv(N5mA2  
 { lGHu@(n<  
  if(pMsg -> wParam == VK_ESCAPE) {ugKv?e ;  
   return TRUE; *9{Wn7pck/  
  if(pMsg -> wParam == VK_RETURN) %TTL^@1!b  
   return TRUE; {*Wwu f.  
 } T0"0/{5-_  
 return CDialog::PreTranslateMessage(pMsg); pW^ ?g|_}  
} Y*`A$  
I4X+'fW,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) G@<lwnvD*J  
{ iK:qPrk-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ -L50kk>h  
  SaveBmp(); P<JkRX  
  return FALSE; e}yu<~v_  
} KY34 'Di  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ wOkJ:k   
 CMenu pop; -j=&J8Za  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); $`dNl#G,  
 CMenu*pMenu=pop.GetSubMenu(0); /(pD^D  
 pMenu->SetDefaultItem(ID_EXITICON); IoHkcP[H  
 CPoint pt; }%d-U;Tt2  
 GetCursorPos(&pt); tBI+uu aa2  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); s=Q*|  
 if(id==ID_EXITICON) '\E{qlI  
  DeleteIcon(); B|$13dHfa  
 else if(id==ID_EXIT) aKzD63  
  OnCancel(); ~Q 9)Q  
 return FALSE; A*U'SCg(G  
} =X5&au o  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); &vvx"  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) N\e@$1  
 AddIcon(); Au*?)X- $  
 return res; ygY+2  
} !vp!\Zj7o  
2m_M9e\  
void CCaptureDlg::AddIcon() x[~OVG0M*  
{ ]`H.qV  
 NOTIFYICONDATA data; u0KZrz  
 data.cbSize=sizeof(NOTIFYICONDATA); Qr-J-2s?B  
 CString tip; i[^lJ)[>N  
 tip.LoadString(IDS_ICONTIP); =&/a\z!  
 data.hIcon=GetIcon(0); p[cL# fBz  
 data.hWnd=GetSafeHwnd(); >!F,y3"5S  
 strcpy(data.szTip,tip); r<N*N,~  
 data.uCallbackMessage=IDM_SHELL; ^?xJpr%)  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Z=[a 8CU  
 data.uID=98; )j|y.[  
 Shell_NotifyIcon(NIM_ADD,&data); Z3~*R7G8>  
 ShowWindow(SW_HIDE); D2 cIVx3:(  
 bTray=TRUE; q>4i0p8^  
} e+ w  
9v,8OK)  
void CCaptureDlg::DeleteIcon() m`q> _*  
{ \.|A,G=  
 NOTIFYICONDATA data;  CF92AY  
 data.cbSize=sizeof(NOTIFYICONDATA); sq|@9GS0T  
 data.hWnd=GetSafeHwnd(); 9<c4y4#y  
 data.uID=98; `v2l1CQ: ^  
 Shell_NotifyIcon(NIM_DELETE,&data); Ngc+<  
 ShowWindow(SW_SHOW); w$:)wyR-  
 SetForegroundWindow(); =usDI<3r  
 ShowWindow(SW_SHOWNORMAL); _`[6jhNa!  
 bTray=FALSE; #$B,8LFz,$  
} yzR=:0J  
U`_vF~el~  
void CCaptureDlg::OnChange() )&!@O$RS8(  
{ E!l1a5qB  
 RegisterHotkey(); 5GL+j%7  
} mg/kyua^  
!:[n3.vm   
BOOL CCaptureDlg::RegisterHotkey() NRF%Qd8I/2  
{ wggHUr(g,  
 UpdateData(); ?s} E<Kr  
 UCHAR mask=0; <@!kR$Rd  
 UCHAR key=0; `0sk2fn  
 if(m_bControl) nJH%pBc  
  mask|=4; (jFE{M$-  
 if(m_bAlt) JP*mQzZL  
  mask|=2; Xb]?/7 X  
 if(m_bShift) cNc _ n<M  
  mask|=1; H).5xx[`  
  key=Key_Table[m_Key.GetCurSel()]; ;iNx@tz4  
 if(bRegistered){ '[8jm=Q#'  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); [4rMUS7-m"  
  bRegistered=FALSE; Cfb-:e$0  
 } ; 2-kQK9  
 cMask=mask; ''Ec-b6Q-  
 cKey=key; e`1s[ ^B  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ^O*hs%eO%  
 return bRegistered; !Qa7-  
} lD#1"$Coz  
i3j jPN!  
  四、小结 .3&OFM  
T-i]O*u  
  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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