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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: 3EYEd39E  
  f0P,j~]  
  一、实现方法 P%R!\i  
 ?s,oH  
  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: +3o vO$g  
2/3yW.C  
#pragma data_seg("shareddata") >/-H!jUF]  
HHOOK hHook =NULL; //钩子句柄 .=:f]fs  
UINT nHookCount =0; //挂接的程序数目 W3~u J(  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 cW^LmA  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ^_#wo"  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey YeCnk:_ kg  
static int KeyCount =0; .]E(P   
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 .u mqyU~  
#pragma data_seg() (Z<@dkO?)  
|&K;*g|a  
  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。 OV{v6,>O  
lITd{E,+r  
  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: 82FEl~,^E  
3w^W6hN)  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR syu/"KY^!  
cKey,UCHAR cMask) ^: /c<(DQD  
{ '`^~Zy?c  
 BOOL bAdded=FALSE; dEYw_qJ2  
 for(int index=0;index<MAX_KEY;index++){ O.jm{x!m  
  if(hCallWnd[index]==0){ YT-ua{ .^  
   hCallWnd[index]=hWnd; i6yA>#^  
   HotKey[index]=cKey; A{> w5T  
   HotKeyMask[index]=cMask; '/`O*KD]  
   bAdded=TRUE; @vq)Y2)r\  
   KeyCount++; T;DKDg a  
   break; XW aa`q  
  } YWU@e[  
 } ]#NfH-T  
 return bAdded; 'jO2pH/%  
} _N;@jq\q  
//删除热键  +C\79,r  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) e(wc [bv  
{ (+gTIcc >  
 BOOL bRemoved=FALSE; "]jN'N(.  
 for(int index=0;index<MAX_KEY;index++){ G+#bO5  
  if(hCallWnd[index]==hWnd){ tD`^qMua  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }Bv1fbD4U  
    hCallWnd[index]=NULL; XHv m{z=  
    HotKey[index]=0; 6n/=n%US  
    HotKeyMask[index]=0; L{~ ]lUo  
    bRemoved=TRUE; ft7M9<#v  
    KeyCount--; n ^9?(a4u  
    break; ZC2aIJ  
   } :.=:N%3[  
  } y9mV6.r  
 } @~vg=(ic(  
 return bRemoved; R:n|1]*f3X  
} ([<{RjPb  
W?SAa7+  
&'`C#-e@  
  DLL中的钩子函数如下: iZk4KX  
X8v)yDtw  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) a5Vlfx  
{ {;Hg1=cm  
 BOOL bProcessed=FALSE; y# \"yykB  
 if(HC_ACTION==nCode) $m ;p@#n  
 { l`~$cK!  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 t>quY$}4  
   switch(wParam) .oM- A\!  
   {  '{0O!y[H6  
    case VK_MENU: P'iX?+*  
     MaskBits&=~ALTBIT; g@x72$j  
     break; vE`;1UA}  
    case VK_CONTROL: cFie;k  
     MaskBits&=~CTRLBIT; a1_ N~4r`  
     break; N5l`Rq^K  
    case VK_SHIFT: ax5n}  
     MaskBits&=~SHIFTBIT; H,<CR9@(5d  
     break; w}6~t\9D  
    default: //judge the key and send message \>4>sCC  
     break; UxMy8} w!y  
   } #&uajo  
   for(int index=0;index<MAX_KEY;index++){ ?#c "wA&  
    if(hCallWnd[index]==NULL) :$VGqvO12W  
     continue; 1/\Xngd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `hY%HzV=  
    { B (eXWWT_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); X*#\JF4$i  
     bProcessed=TRUE; CD`6R.  
    } c\[&IlM  
   } l9/}fMi  
  } cq]0|\Vz  
  else if((lParam&0xc000ffff)==1){ //有键按下 OLF6["0Rn  
   switch(wParam) #k<l5x`  
   { {R(/Usg!=  
    case VK_MENU: A' ![*O  
     MaskBits|=ALTBIT; fN{wP,jI  
     break; }JOz,SQHP  
    case VK_CONTROL: >=rniHs=?7  
     MaskBits|=CTRLBIT; /(||9\;  
     break; ^xk4HF   
    case VK_SHIFT: ;s~xS*(C  
     MaskBits|=SHIFTBIT; ZwxEcs+UM  
     break; OWz{WV.  
    default: //judge the key and send message p\I3fI0i  
     break; U(+QrC:  
   } ph)=:*A6&  
   for(int index=0;index<MAX_KEY;index++){ !1S!)#  
    if(hCallWnd[index]==NULL) Y#):1C1  
     continue;  })!-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n9 bp0#K  
    { !<h9XccN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;[lLFI  
     bProcessed=TRUE; G,6`:l  
    } |CQjgI|;  
   } +R$;LtR  
  } AvIheR  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 .FYRi_Zd  
   for(int index=0;index<MAX_KEY;index++){ h+d k2|a  
    if(hCallWnd[index]==NULL) q~18JB4WPJ  
     continue; s,C>l_4-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) s(5(zcBK  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ?N+pWdi  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 _ZWU~38PM  
   } 6V9r[,n  
  } IY~I=}  
 } }|-8- ;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ZHwN3  
} 3>5gh8!-  
J#w=Z>oz<  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: WSF$xC /~  
= ?/6hB=7<  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .2P3 !KCL  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7"eIZ  
kVeY} 8  
  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: %;_EWs/z8  
i5WO)9Us  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) dqU)(T=C  
{ a{;+_J3S  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) !}`[s2ji  
 { V LeYO5'L  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 }!*|VdL0  
  SaveBmp(); nR Hl Hu  
  return FALSE; &f A1kG%  
 } u,@ac[!vP  
 …… //其它处理及默认处理 va(6?"9  
} $^e_4]k  
p&xj7qwp@F  
SRHD"r^@  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 /a$Zzs&xs  
#~rQ\A!4  
  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。 ,o `tRh<  
,rY}IwM w  
  二、编程步骤 HA$7Q~{N-t  
RU.MJ kYQ5  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 2 =>3B  
4;jAdWj3  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; +U1fa9NSn  
e'v_eD T^  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; /lHs]) ,  
<g&GIFE,  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 8SiWAOQAL  
5M>SrZH  
  5、 添加代码,编译运行程序。 oY\;KPz  
-G1R><8[  
三、程序代码 Uu`}| &@i  
! }eq~3  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL M.$=tuUL  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 925T#%y  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ s }^W2  
#if _MSC_VER > 1000 |c$*Fa"A  
#pragma once DM,;W`|6%  
#endif // _MSC_VER > 1000 ~2NT Xp  
#ifndef __AFXWIN_H__ 8M['-  
#error include 'stdafx.h' before including this file for PCH !*wd d8   
#endif :K \IS`  
#include "resource.h" // main symbols \u/=?b  
class CHookApp : public CWinApp N>j*{]OY+{  
{ <qoPBm])  
 public: 2{hG",JL  
  CHookApp(); d)%l-jj9,  
  // Overrides Me+)2S 9  
  // ClassWizard generated virtual function overrides /PBK:B  
  //{{AFX_VIRTUAL(CHookApp) a5]]AkvA  
 public: !$-QWKD4  
  virtual BOOL InitInstance();  poZ&S  
  virtual int ExitInstance(); pL.~z  
  //}}AFX_VIRTUAL v`jFWq8I,  
  //{{AFX_MSG(CHookApp) WK SWOSJ  
  // NOTE - the ClassWizard will add and remove member functions here. mL@7,GD  
  // DO NOT EDIT what you see in these blocks of generated code ! LKud'  
  //}}AFX_MSG !?B2OE  
  DECLARE_MESSAGE_MAP() @nj`T{*.  
}; &4p~i Z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ?G5,x  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T< <N U"n  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); YL4yT`*  
BOOL InitHotkey(); ?I.bC   
BOOL UnInit(); 57N<OQWf  
#endif h5; +5B}D  
gi/W3q3c6  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 5)4?i p  
#include "stdafx.h" 5e'**tbKH  
#include "hook.h" taSYR$VJ  
#include <windowsx.h> aTLr%D:Ka  
#ifdef _DEBUG yAJrdY"  
#define new DEBUG_NEW %)r1?H} #%  
#undef THIS_FILE y$|OE%S  
static char THIS_FILE[] = __FILE__; y=1(o3(  
#endif ,ce$y4%(  
#define MAX_KEY 100 7ws[Rp8  
#define CTRLBIT 0x04 B/EGaYH  
#define ALTBIT 0x02 {RH)&k&%  
#define SHIFTBIT 0x01 Fz$^CMw5K  
#pragma data_seg("shareddata") W$R@Klz  
HHOOK hHook =NULL; {f>e~o  
UINT nHookCount =0; ]"vpCL  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey CakB`q(8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT e0o)Jo.P  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey OFlY"O S[  
static int KeyCount =0; &Mh]s\  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift =NL(L  
#pragma data_seg() wIQt f|ZI>  
HINSTANCE hins; M0MvOO*ad  
void VerifyWindow(); DB+.<  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Y#Pg*C8>8  
//{{AFX_MSG_MAP(CHookApp) W'C~{}c=  
// NOTE - the ClassWizard will add and remove mapping macros here. ?CuwA-j  
// DO NOT EDIT what you see in these blocks of generated code! ~,84E [VV  
//}}AFX_MSG_MAP 2MKB (;k  
END_MESSAGE_MAP() dMH}%f5;1  
]*AQT7PH  
CHookApp::CHookApp() !2g*=oY  
{ -sk!XWW+  
 // TODO: add construction code here, #Ic-?2Gn4<  
 // Place all significant initialization in InitInstance ~w$ ^`e!]  
} T C._kAm  
NFb<fD[C  
CHookApp theApp; %t,Fxj4F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) AhSN'gWpbF  
{ Dn.%+im-u  
 BOOL bProcessed=FALSE; ca$K)=cDW  
 if(HC_ACTION==nCode) A!`Q[%$  
 { EYKV}`  
  if((lParam&0xc0000000)==0xc0000000){// Key up RMxFo\TK;  
   switch(wParam) K!SFS   
   { +C[%^G-:  
    case VK_MENU: O>2i)M-h9x  
     MaskBits&=~ALTBIT; ,fD#)_\g2  
     break; <#:ey^q<  
    case VK_CONTROL: &B ^LaRg  
     MaskBits&=~CTRLBIT; -xU4s  
     break; ,tHV H7[  
    case VK_SHIFT: ywbdV-t/  
     MaskBits&=~SHIFTBIT; 5+iXOs<   
     break; 69{q*qCW  
    default: //judge the key and send message vHx[:vuq:  
     break; A]s|"Pav,  
   } H<wkD9v}H5  
   for(int index=0;index<MAX_KEY;index++){ q{+Pf/M5  
    if(hCallWnd[index]==NULL) A>J,Bi  
     continue; N/N~>7f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *#CUZJN\  
    { yK:b $S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); B["C~aF  
     bProcessed=TRUE; 2G BE=T  
    } [#C(^J*@c  
   } .L}k-8  
  } 5g;i{T/6~x  
  else if((lParam&0xc000ffff)==1){ //Key down #qdfr3  
   switch(wParam) CR'1,  
   { j q1 |`:  
    case VK_MENU: &X OFc.u  
     MaskBits|=ALTBIT; {3*Zx"e![  
     break; >du|DZq  
    case VK_CONTROL: X< p KAO\  
     MaskBits|=CTRLBIT; Y`!Zk$8  
     break; 5TS&NefM  
    case VK_SHIFT: aO$I|!tl  
     MaskBits|=SHIFTBIT; '@,M 'H{  
     break; Ex}hk!  
    default: //judge the key and send message E4N{;'  
     break; h_K!ch }  
   } v_e3ZA:%  
   for(int index=0;index<MAX_KEY;index++) c^EU &q{4  
   { [$%O-_x  
    if(hCallWnd[index]==NULL) ,ftKRq  
     continue; #hF(`oX}4K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @j=Q$k.GF  
    { jS| 9jg:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); zP|^) h5  
     bProcessed=TRUE; Y4I;-&d's  
    } 58o'Q  
   } ]}0QrD  
  } &Z 6s\r%  
  if(!bProcessed){ *VgiJ  
   for(int index=0;index<MAX_KEY;index++){ C0%yGLh&  
    if(hCallWnd[index]==NULL) >K-S&Y  
     continue; qv.s-@l8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) j )b[7%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); gano>W0  
   } d\v1R-V  
  } fu $<*Sa2  
 } <#F@OU  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); TnQ"c)ta  
} X6SWcJtSw  
J>p6')Y6~  
BOOL InitHotkey() nv/'C=+L  
{ $ucA.9pJ  
 if(hHook!=NULL){ ?_nbaFQK3  
  nHookCount++; :SvgXMY@  
  return TRUE; GX ;~K  
 } ^n&_JQIXb  
 else 6#(==}Sm+  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); V(3=j)#  
  if(hHook!=NULL) 'CA{>\F$F+  
   nHookCount++; ~"nF$DB  
  return (hHook!=NULL); 6-J%Z%yT #  
} 'j(F=9)  
BOOL UnInit() 'Uu!K!  
{ yttaZhK^u  
 if(nHookCount>1){ kBg8:bo~  
  nHookCount--; EE$\8Gx']!  
  return TRUE; *Sp_s_tS  
 } 9vI<\ Xa  
 BOOL unhooked = UnhookWindowsHookEx(hHook); T1=T  
 if(unhooked==TRUE){ ?Es(pwJB  
  nHookCount=0; SZ(]su:  
  hHook=NULL; bfX yuv  
 } L(+I  
 return unhooked; U;#9^<^  
} @p ZjJ<9QM  
ZGj ^,?a  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) NWS3-iZ|8  
{ Zi= /w  
 BOOL bAdded=FALSE; y$[:Kh,  
 for(int index=0;index<MAX_KEY;index++){ _kXq0~  
  if(hCallWnd[index]==0){ K$/&C:,Q  
   hCallWnd[index]=hWnd; &$g{i:)Z  
   HotKey[index]=cKey; liU8OXBl  
   HotKeyMask[index]=cMask; &OsO _F  
   bAdded=TRUE; <sli!rv  
   KeyCount++; F(KsB5OY?  
   break; w?:tce   
  } @A'@%Zv-  
 } ?!HU$>  
 return bAdded; O_\%8*;  
} !QS j*)V#  
^xm%~   
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dJ>~  
{ cp$GP*{@  
 BOOL bRemoved=FALSE; "Tz'j}< 9C  
 for(int index=0;index<MAX_KEY;index++){ Fj4>)!^kM  
  if(hCallWnd[index]==hWnd){ :T )R;E@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ WT63ve  
    hCallWnd[index]=NULL; <NWq0 3:&  
    HotKey[index]=0; 2"6bz^>}  
    HotKeyMask[index]=0; ]Bj2;<@y  
    bRemoved=TRUE; LS]0p#  
    KeyCount--; E.N  
    break; #f<3[BLx  
   } S`8Iu[Ma  
  } Z5|BwM  
 } );;UA6CD  
 return bRemoved; T:Nc^QP|tm  
} T/]f5/  
.tcdqL-'  
void VerifyWindow() nO+R >8,Q  
{ @ Fkhida  
 for(int i=0;i<MAX_KEY;i++){ rld8hFj  
  if(hCallWnd!=NULL){ VYjt/\ Z  
   if(!IsWindow(hCallWnd)){ Xz`0nU  
    hCallWnd=NULL; AVi&cvhs  
    HotKey=0; nvQTJ4,,  
    HotKeyMask=0; h8dFW"cpC  
    KeyCount--; 8qL.L(=\/  
   } Swr4De_5  
  } QQJf;p7  
 } -}3nIk<N  
} Vh{(*p  
}i{A4f `  
BOOL CHookApp::InitInstance() TJCE6QG  
{ LUdXAi"f  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 6n^@Ps  
 hins=AfxGetInstanceHandle(); RdBIbm  
 InitHotkey(); u4j"U6"]M  
 return CWinApp::InitInstance(); Y>6N2&Q  
} -Xx4:S  
pX+4B=*  
int CHookApp::ExitInstance() S$ffTdRz  
{ Y (p Ud3y  
 VerifyWindow(); T+e*'<!O  
 UnInit(); .cm2L,1h  
 return CWinApp::ExitInstance(); "VDMO^  
} m?kyAW'|  
Dxy^r*B  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file t)1`^W}  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 1yVhO2`7]  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ <RKT |  
#if _MSC_VER > 1000 F1A40h7R$Y  
#pragma once 1ktxG1"1  
#endif // _MSC_VER > 1000 uP+VS>b  
+Qf}&D_  
class CCaptureDlg : public CDialog H@1}_d  
{ `Qjs {H  
 // Construction /3&MUB*z&y  
 public: 0` .5gxm  
  BOOL bTray; L 0oVXmlr  
  BOOL bRegistered; [Q+k2J_h  
  BOOL RegisterHotkey(); L7hRFf-o  
  UCHAR cKey; G[1\5dK*uR  
  UCHAR cMask; ?}uuTNLl)  
  void DeleteIcon(); tva=DS  
  void AddIcon(); NBHpM}1xtU  
  UINT nCount; C~R ?iZ.&U  
  void SaveBmp(); f}J(nz>Sh  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor . P+Qu   
  // Dialog Data MqJ5|C.q  
  //{{AFX_DATA(CCaptureDlg) t1]/Bw`j/  
  enum { IDD = IDD_CAPTURE_DIALOG }; Vd(n2JMtG  
  CComboBox m_Key; \ 'Va(}v  
  BOOL m_bControl; { :1X N  
  BOOL m_bAlt; 'ZB^=T  
  BOOL m_bShift; ()48>||  
  CString m_Path; &gPP# D6A  
  CString m_Number; &O^-,n  
  //}}AFX_DATA Z"RgqNf  
  // ClassWizard generated virtual function overrides *~>p;*  
  //{{AFX_VIRTUAL(CCaptureDlg) X'-Yz7J?o  
 public: !|up"T I  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 7f4O~4.[i  
 protected: :eSsqt9]9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &7oL2 Wf  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 7[w<v(Rc  
  //}}AFX_VIRTUAL - Z`RKR8C  
  // Implementation H>A6VDu  
 protected: JJM<ywPGp  
  HICON m_hIcon; 2 rr=FJ  
  // Generated message map functions [orL.D]  
  //{{AFX_MSG(CCaptureDlg) =MMd&  
  virtual BOOL OnInitDialog(); }z x ~  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); VX&PkGi?o  
  afx_msg void OnPaint(); _bi)d201  
  afx_msg HCURSOR OnQueryDragIcon(); SI=u-'%  
  virtual void OnCancel(); W"^=RY  
  afx_msg void OnAbout(); "L:4 7!8  
  afx_msg void OnBrowse(); oFf9KHorW  
  afx_msg void OnChange(); T4HJy|  
 //}}AFX_MSG t:5-Ro  
 DECLARE_MESSAGE_MAP() #,u|*O:  
}; yji[Yde;|  
#endif BqY_N8l&E  
wV"`Du7E;  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "J`&"_CyZ  
#include "stdafx.h"  +l/v`=C  
#include "Capture.h" {BT/P!  
#include "CaptureDlg.h" 0=#>w_B  
#include <windowsx.h> S.)Jp -&K  
#pragma comment(lib,"hook.lib") }&t>j[  
#ifdef _DEBUG avL_>7q  
#define new DEBUG_NEW r]UF<*$  
#undef THIS_FILE V@!)Pw  
static char THIS_FILE[] = __FILE__; 4uo`XJuQ  
#endif !~Uj 'w  
#define IDM_SHELL WM_USER+1 ANy*'/f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qfyZda0d  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |7tD&9<  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; =I'3C']Z W  
class CAboutDlg : public CDialog o[T+/Ej&  
{ !6T"J!F#  
 public: ~?AEtl#&"  
  CAboutDlg(); PmRvjSIG  
  // Dialog Data J+J,W5t^  
  //{{AFX_DATA(CAboutDlg) #uw&u6*\q  
  enum { IDD = IDD_ABOUTBOX }; ]m b8R:a1  
  //}}AFX_DATA U8w_C\Q  
  // ClassWizard generated virtual function overrides E5d$n*A  
  //{{AFX_VIRTUAL(CAboutDlg) Z0jgUq`r  
 protected: $Sgf jm  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +t+<?M B  
  //}}AFX_VIRTUAL :q]9F4im  
  // Implementation ^k;]"NR  
 protected: fq]PKLW'  
  //{{AFX_MSG(CAboutDlg) RhH 1nf2UR  
  //}}AFX_MSG S@FO&o 0  
  DECLARE_MESSAGE_MAP() eZLEdTScM  
}; 4=xi)qF/@  
kkF)Tro\  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ]:59c{O  
{ La;G S  
 //{{AFX_DATA_INIT(CAboutDlg) Aw |;C  
 //}}AFX_DATA_INIT }OL"38P  
} `t&{^ a&Y"  
@#)` -]g  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) "y,YC M`  
{ Xq*^6*E-}  
 CDialog::DoDataExchange(pDX); /Hyz]46  
 //{{AFX_DATA_MAP(CAboutDlg) ^Tm`motzh  
 //}}AFX_DATA_MAP Ki\.w~Qs  
} *h!fqT%9  
_U<fS  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) /|1p7{km  
 //{{AFX_MSG_MAP(CAboutDlg) QEhn  
 // No message handlers VThr]$2Y  
 //}}AFX_MSG_MAP Nr4:Gih  
END_MESSAGE_MAP() ?Gki0^~J  
lmvp,BzC  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) h'):/}JPl  
: CDialog(CCaptureDlg::IDD, pParent) )U?_&LY)[M  
{ '4[=*!hs!  
 //{{AFX_DATA_INIT(CCaptureDlg) * x/!i^  
  m_bControl = FALSE; 4Z( #;9f  
  m_bAlt = FALSE; :$MOdLr  
  m_bShift = FALSE; I6W`yh`I)  
  m_Path = _T("c:\\"); z1PwupXt1  
  m_Number = _T("0 picture captured."); O?JJE8~']  
  nCount=0; NXU:b"G S  
  bRegistered=FALSE; V&M*,#(?  
  bTray=FALSE; 3'0Pl8  
 //}}AFX_DATA_INIT =?<WCR C*  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32  `Vb  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ]:<! (  
} h[ DNhR  
T{k P9 4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) cz>,sz~i  
{ z-5`6aE9<  
 CDialog::DoDataExchange(pDX); tnRf!A;m  
 //{{AFX_DATA_MAP(CCaptureDlg) oJz2-P mX  
  DDX_Control(pDX, IDC_KEY, m_Key); 5i!Q55Yv=,  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 3 !"N;Q"  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 9\?OV @  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); >='/%Ad  
  DDX_Text(pDX, IDC_PATH, m_Path); Gk,Bx1y  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ,,'jyqD  
 //}}AFX_DATA_MAP Dcl$?  
} 6#?T?!vZ  
\<4N'|:  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) e1m?g&[  
//{{AFX_MSG_MAP(CCaptureDlg) cO~<iy  
 ON_WM_SYSCOMMAND() Z!1D4`w  
 ON_WM_PAINT() 9%/hoA)  
 ON_WM_QUERYDRAGICON()  +$dJA  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) z%;p lMj  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) iC gZ3M]  
 ON_BN_CLICKED(ID_CHANGE, OnChange) kQ`tY`3F  
//}}AFX_MSG_MAP LKIMT  
END_MESSAGE_MAP() =3e7n2N)  
" O&93#8  
BOOL CCaptureDlg::OnInitDialog() 3S0.sU~_U  
{ U0~_'&Fe  
 CDialog::OnInitDialog(); ?+yr7_f3*  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); mmAm@/  
 ASSERT(IDM_ABOUTBOX < 0xF000); _pvB$&  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 9%!h/m>rW  
 if (pSysMenu != NULL) [ GLH8R  
 { BG>Y[u\N  
  CString strAboutMenu; "yn~axk7  
  strAboutMenu.LoadString(IDS_ABOUTBOX); )ZG;.j  
  if (!strAboutMenu.IsEmpty()) 3o<d= @`r  
  { )dXa:h0RZ  
   pSysMenu->AppendMenu(MF_SEPARATOR); _bFUr  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); M";qo6  
  } 3nq?Y8yac  
 } +)Z]<O  
 SetIcon(m_hIcon, TRUE); // Set big icon fE#(M+(<  
 SetIcon(m_hIcon, FALSE); // Set small icon ')X (P>  
 m_Key.SetCurSel(0); DXFu9RE\{  
 RegisterHotkey(); 51#*8u+L  
 CMenu* pMenu=GetSystemMenu(FALSE); RJrz ~,}  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); SK<Rk  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); n ~t{]if"  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); qpjY &3SI  
 return TRUE; // return TRUE unless you set the focus to a control 1Ms[$$b$  
} /k#-OXP~  
g9_zkGc7  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ~wvt:E,f C  
{ Wv;0PhF  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ;FPx  
 { CWj_K2=d  
  CAboutDlg dlgAbout; D tsZP (  
  dlgAbout.DoModal(); I= mz^c{  
 } w+M/VsL  
 else `zd,^.i5~  
 { vCzZjGBY  
  CDialog::OnSysCommand(nID, lParam); *FS8]!Qg  
 } `KJ( .m  
} SQp|  
D31X {dJ  
void CCaptureDlg::OnPaint() VF%QM;I[Rc  
{ !ifU}qFzK  
 if (IsIconic()) DeO-@4+qKd  
 { ;Rrh$Ag  
  CPaintDC dc(this); // device context for painting P}bIp+  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); LCF}Y{  
  // Center icon in client rectangle  j]u!;]  
  int cxIcon = GetSystemMetrics(SM_CXICON); \Z-th,t  
  int cyIcon = GetSystemMetrics(SM_CYICON); y7Po$)8l  
  CRect rect; 3uL f0D  
  GetClientRect(&rect); F'bwXb**  
  int x = (rect.Width() - cxIcon + 1) / 2; }K{1Bm@S  
  int y = (rect.Height() - cyIcon + 1) / 2; i Ha?b2=)  
  // Draw the icon =u.@W98, K  
  dc.DrawIcon(x, y, m_hIcon); E$ d#4x  
 } 5E!C?dv(z  
 else &5 CRXf  
 { ]?9*Vr:P^  
  CDialog::OnPaint(); nL@'??I1  
 } mypV[  
} BI'>\hX/V  
MK&,2>m,A  
HCURSOR CCaptureDlg::OnQueryDragIcon() u[>"_!T  
{ v88vr  
 return (HCURSOR) m_hIcon; 87 Z[0>  
} #mxOwvJ  
!Sc"V.o @!  
void CCaptureDlg::OnCancel() CSM"Kz`  
{ AIF ?>wgq  
 if(bTray) { 3G  
  DeleteIcon(); v 6~9)\!j  
  CDialog::OnCancel(); "<,lqIqA;  
} +8Xjk\Hi  
u4x-GObJM  
void CCaptureDlg::OnAbout() L2}\Ah"[  
{ /6x&%G:m#  
 CAboutDlg dlg; P/%7kD@5;  
 dlg.DoModal(); 6h 0qtXn-  
} _`$Q6!Z)l  
?&B8:<qy;L  
void CCaptureDlg::OnBrowse() 6'qkD<  
{ iaGA9l<b  
 CString str; j=WxtMS  
 BROWSEINFO bi; coP->&(@U#  
 char name[MAX_PATH]; +m=b "g  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); qeZG/\,  
 bi.hwndOwner=GetSafeHwnd(); l:HQ@FX  
 bi.pszDisplayName=name; .OPknC  
 bi.lpszTitle="Select folder"; ,Qj G|P  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 727#7Bo  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Xp<q`w0I,  
 if(idl==NULL) &@~K8*tmK  
  return; -amo8V;2H  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ^y<^hKjV  
 str.ReleaseBuffer(); ,d"T2Hy  
 m_Path=str; &<&tdShI  
 if(str.GetAt(str.GetLength()-1)!='\\') jqUVERbc  
  m_Path+="\\"; i~@gI5[k+  
 UpdateData(FALSE); ^e:z ul{;]  
} ,K5K?C$k  
 H.5 6  
void CCaptureDlg::SaveBmp() m=l>8  
{ uGU 2  
 CDC dc; 0.MB;gm:  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ^<;W+dWdU  
 CBitmap bm; AHf 9H?  
 int Width=GetSystemMetrics(SM_CXSCREEN); tUu ' gs|  
 int Height=GetSystemMetrics(SM_CYSCREEN); 5 jrR]X  
 bm.CreateCompatibleBitmap(&dc,Width,Height); HqGI.  
 CDC tdc; ysaRH3M  
 tdc.CreateCompatibleDC(&dc); +a,SP   
 CBitmap*pOld=tdc.SelectObject(&bm); QiCia#_  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6pt,]FlU  
 tdc.SelectObject(pOld); qe]D4K8`Q3  
 BITMAP btm; I?T !  
 bm.GetBitmap(&btm); _u]Z+H"  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 92TuuN#{  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); FFT)m^4p.  
 BITMAPINFOHEADER bih; x39tnf/F  
 bih.biBitCount=btm.bmBitsPixel; N,`@Q7  
 bih.biClrImportant=0; h ldZA  
 bih.biClrUsed=0; c`E>7Hjr-  
 bih.biCompression=0; #MC#K{Xd  
 bih.biHeight=btm.bmHeight; &;Ncc,jb  
 bih.biPlanes=1; O,$*`RZpx  
 bih.biSize=sizeof(BITMAPINFOHEADER); fB2ILRc  
 bih.biSizeImage=size; ak7%  
 bih.biWidth=btm.bmWidth; " ityx?  
 bih.biXPelsPerMeter=0; l\_!oa~  
 bih.biYPelsPerMeter=0; ?1Nz ,Lc$  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); kQ\GVI11?  
 static int filecount=0; ]TvMT  
 CString name; x[ A|@\Z  
 name.Format("pict%04d.bmp",filecount++); 757&bH|a  
 name=m_Path+name; l)r\SE1  
 BITMAPFILEHEADER bfh; y-pdAkDh  
 bfh.bfReserved1=bfh.bfReserved2=0; :zW? O#aL-  
 bfh.bfType=((WORD)('M'<< 8)|'B'); G|cjI*  
 bfh.bfSize=54+size; Bg|d2,im  
 bfh.bfOffBits=54; FSuC)Xg  
 CFile bf; Fe8X@63  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 3M#x)cW  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); "&_+!TBg,  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); M$x,B#b  
  bf.WriteHuge(lpData,size); xQR/Xp!h  
  bf.Close(); v.ZUYa|  
  nCount++; L15)+^4n  
 } s}zR@ !`  
 GlobalFreePtr(lpData); :3F[!y3b  
 if(nCount==1) ^EIuGz1@0  
  m_Number.Format("%d picture captured.",nCount); 0fc;H}B*  
 else \Z.r Pq  
  m_Number.Format("%d pictures captured.",nCount); CvIuH=,  
  UpdateData(FALSE); f]*;O+8$LN  
} enk`I$Xx  
:6n4i$  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) VgPlIIHh5  
{ %[XP}L$  
 if(pMsg -> message == WM_KEYDOWN) &XNt/bK -?  
 { @(R=4LL  
  if(pMsg -> wParam == VK_ESCAPE) 6 ;'s9s"  
   return TRUE; 1 |z4]R,<  
  if(pMsg -> wParam == VK_RETURN) jHEP1rNHE  
   return TRUE; `8ob Xb  
 } :E W1I>}_  
 return CDialog::PreTranslateMessage(pMsg); RFM;?!S  
} A6z2KVk  
 II'.vp  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) fhi}x(  
{ ?0)K[Kd'Y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 4(8c L?J`0  
  SaveBmp(); bI.hG32  
  return FALSE; nw+t!C  
} Sr+hB>{  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 'c~SE>  
 CMenu pop; vhMoCLb  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); nscnG5'{+  
 CMenu*pMenu=pop.GetSubMenu(0); G 1{m"1M  
 pMenu->SetDefaultItem(ID_EXITICON); hUpour |b  
 CPoint pt; _J*l,]}S  
 GetCursorPos(&pt); Le83[E*i  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 0 Rb3| te  
 if(id==ID_EXITICON) WOPIF~1v  
  DeleteIcon(); 7,)E1dx -V  
 else if(id==ID_EXIT) I(UK9H{0$  
  OnCancel(); Q``1^E'  
 return FALSE; OcB&6!1u  
} ;$tdn?|  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); qFVZhBC  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) j6s j2D  
 AddIcon(); Z71_D  
 return res; {~&]  
} M._h=wX{}  
ll}_EUF|  
void CCaptureDlg::AddIcon() :TVo2Zm[@  
{ 42e[OG-  
 NOTIFYICONDATA data; 7(5d$W  
 data.cbSize=sizeof(NOTIFYICONDATA); =nHkFi@D=t  
 CString tip; p$F` 9_bZ  
 tip.LoadString(IDS_ICONTIP); :@p]~{m:G  
 data.hIcon=GetIcon(0); F=&,=r' Q8  
 data.hWnd=GetSafeHwnd(); v1u~[c=|^  
 strcpy(data.szTip,tip); H-t$A, [  
 data.uCallbackMessage=IDM_SHELL; vJr,lBHEk  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; WiZkIZ  
 data.uID=98; ;{8 X+H  
 Shell_NotifyIcon(NIM_ADD,&data); XN-1`5:4I  
 ShowWindow(SW_HIDE); <e&v[  
 bTray=TRUE; M19O^P>[  
} 0aq{Y7sYU  
J+CGhk  
void CCaptureDlg::DeleteIcon() b73}|4v  
{ NXLb'mH~  
 NOTIFYICONDATA data; <IU   
 data.cbSize=sizeof(NOTIFYICONDATA); NI/'SMj%  
 data.hWnd=GetSafeHwnd(); @Y,t]  
 data.uID=98; Gy+c/gK  
 Shell_NotifyIcon(NIM_DELETE,&data); 51% Rk,/o  
 ShowWindow(SW_SHOW); 0rX%z$D+@  
 SetForegroundWindow(); *QNX?8Fm_  
 ShowWindow(SW_SHOWNORMAL); l`75BR  
 bTray=FALSE; }2Ge??!  
} DI/d(oFv`  
J<NpA(@^  
void CCaptureDlg::OnChange() ZT"vVX- )G  
{ Ag3+z+uS  
 RegisterHotkey(); nzO -\`40  
} '"q+[zwv  
Li8/GoJW-T  
BOOL CCaptureDlg::RegisterHotkey() f x:vhEX  
{ U4Zx1ieCKH  
 UpdateData(); HI1|~hOb'  
 UCHAR mask=0; /g0' +DP  
 UCHAR key=0; <bn|ni|c"  
 if(m_bControl) 7aRy])x  
  mask|=4; ;Ym6ey0t  
 if(m_bAlt)  Z a,o  
  mask|=2; E690'\)31  
 if(m_bShift) UQI!/6F  
  mask|=1; d:Z|It  
  key=Key_Table[m_Key.GetCurSel()]; cEXd#TlY~X  
 if(bRegistered){ <`q-#-V@  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); w3iX "w  
  bRegistered=FALSE; n\7 >_  
 } Z3<lJk\Y  
 cMask=mask; W-D4" G@  
 cKey=key; Hl}m*9<9us  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); g \+!+!"~  
 return bRegistered; 7h. [eMLPB  
} <}mA>c'k  
U_9|ED:  
  四、小结 <%4pvn8d?&  
sj+ )   
  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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