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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: 2fc+PE  
  54TWFDmGi  
  一、实现方法 #3?"#),q  
FU}- .Ki  
  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*LPwJuv  
W0U|XX!&  
#pragma data_seg("shareddata") p>pAU$k{O  
HHOOK hHook =NULL; //钩子句柄 <>-gQ9  
UINT nHookCount =0; //挂接的程序数目 !{uV-c-5,  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 +U<Ae^V  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 O f-gG~  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey UQ^ )t ]  
static int KeyCount =0; SFsT^f<  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ao2o!-?!t  
#pragma data_seg() (lit^v,9  
3+U2oI:I  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 )0;O<G] d  
Cd p_niF  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ,<OS: ]  
hiR+cPSF  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR b_~KtMO  
cKey,UCHAR cMask) s\3ZE11L  
{ "6?Y$y/wm  
 BOOL bAdded=FALSE; t `\l+L  
 for(int index=0;index<MAX_KEY;index++){ W`wT0kP?*]  
  if(hCallWnd[index]==0){ q>#P|  
   hCallWnd[index]=hWnd; 2PSv3?".  
   HotKey[index]=cKey; cetlr  
   HotKeyMask[index]=cMask; @ eP[*Q  
   bAdded=TRUE; {`L,F  
   KeyCount++; 1BzU-Ma  
   break; .N#grk)C  
  } 1b!5h  
 } zfml^N  
 return bAdded; U.W Mu%  
} hJJo+NNN  
//删除热键 (G"/C7q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Y:'c<k  
{ u C`)?f*I  
 BOOL bRemoved=FALSE; 4Gy3s|{  
 for(int index=0;index<MAX_KEY;index++){ OPKmYzf@b  
  if(hCallWnd[index]==hWnd){ jin?;v  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ a4!6K  
    hCallWnd[index]=NULL; {y:+rh&  
    HotKey[index]=0; )#cGeP A  
    HotKeyMask[index]=0; :OY7y`hRG  
    bRemoved=TRUE; QlxlT$o}  
    KeyCount--; Yg`z4 U'6~  
    break; l)1ySX&BU  
   } @L^30>?l  
  } !r0 z3^*N  
 } ;|K(6)  
 return bRemoved; HR k^KB  
} fbW#6:Y  
zB{be_Tw  
\6Hu&WHy  
  DLL中的钩子函数如下: Dr"F5Wbg  
K<Y-/t  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) TqMy">>  
{ }EHmVPe  
 BOOL bProcessed=FALSE; gLv";"4S  
 if(HC_ACTION==nCode) gMZ?MG  
 { o"A%dC_  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ;0\  
   switch(wParam) 5 %aT  
   {  -U_<:  
    case VK_MENU: V0 OT_F  
     MaskBits&=~ALTBIT; E|^~R}z)  
     break; 9Fxz9_ i  
    case VK_CONTROL: s|&2QG0'7  
     MaskBits&=~CTRLBIT; ~x}=lKN  
     break; &+t,fwlM  
    case VK_SHIFT: "Mmvf'N  
     MaskBits&=~SHIFTBIT; 7":0CU% %  
     break; :j,e0#+sA  
    default: //judge the key and send message ^k?Ig.m  
     break; Ow]c,F}^  
   } Lv ,Ls  
   for(int index=0;index<MAX_KEY;index++){ m)?cXM  
    if(hCallWnd[index]==NULL) #r)c@?T@j  
     continue; n.Q?@\}2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 21U,!  
    { L$FLQyDR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8aD4 wc  
     bProcessed=TRUE; "VcG3.  
    }  G l*C"V  
   } KArnNmJ9  
  } 5ff66CRw  
  else if((lParam&0xc000ffff)==1){ //有键按下 5fBW#6N/  
   switch(wParam) EkqsE$52  
   { 9Kyr/6w4-k  
    case VK_MENU: q-}J0vu\K  
     MaskBits|=ALTBIT; '&}B"1  
     break; !g~xn2m$R  
    case VK_CONTROL: '%R Yo#  
     MaskBits|=CTRLBIT; @Tr8.4  
     break; #3u;Ox  
    case VK_SHIFT: `riK[@  
     MaskBits|=SHIFTBIT; |L7 `7!Z  
     break; Tl Z|E '_C  
    default: //judge the key and send message G?d28p',.  
     break; mOyBSOad4  
   } 0BIH.ZV#  
   for(int index=0;index<MAX_KEY;index++){ F/}PN1#T  
    if(hCallWnd[index]==NULL) J%_ :A"  
     continue; =2{^qvP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Jh[fFg]  
    { %c(':vI#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); y4Plm.  
     bProcessed=TRUE; K$\]\qG6  
    } r!etj3  
   } [3rvRJ.  
  } jzu1>*ok  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 dM7-,9Vc  
   for(int index=0;index<MAX_KEY;index++){ [>4Ou^=1  
    if(hCallWnd[index]==NULL) t*^Q`V wQ  
     continue; dGcG7*EX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) eEQ 4L\d  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); BxO8oKe  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 X'WbS  
   } kL,AY-Iu{@  
  } A3bE3Fk$  
 } Ah28D!Gor  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); m> ?OjA!  
} zD-.bHo>.  
+=^10D  
  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: 9#.nNv*z3  
L*1C2EL/q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^6|Q$]}Ok  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); BD9W-mF  
X[ }5hZcX  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Lu6!W  
c:4M|t=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) x(&o=Pu  
{ =zt@*o{F  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) p0UR5A>p  
 { +hRAU@RA  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 :}v&TQ  
  SaveBmp(); ! iA0u  
  return FALSE; kc\^xq~  
 } )&<BQIv9/  
 …… //其它处理及默认处理 cWP34;NNM  
} Qq(/TA0$-  
hkee,PiiP  
,[%KSyH  
  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。 B_anO{3$4  
8/x@|rjW  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 NSUw7hnWvz  
KQj5o>} 6  
  二、编程步骤 I1S*=^Z_U  
1RZhy_$\.  
  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"; \vXo~_-&  
fa;\4#  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 9sifc<za  
+;tXk  
  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; 61HU_!A8S  
nc!P !M  
  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; >uN{cohs  
|?hNl2m  
  5、 添加代码,编译运行程序。 9o"k 7$  
>}%  
三、程序代码 Ly0^ L-~|  
E4 GtJ`{X  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL bf|s=,D  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) /qa{*"2Qo  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ DpH+lpC  
#if _MSC_VER > 1000 lM~ 3yBy  
#pragma once Z1 %"w*U  
#endif // _MSC_VER > 1000 _8Cw_  
#ifndef __AFXWIN_H__ :3J, t//c  
#error include 'stdafx.h' before including this file for PCH (-viP  
#endif &#^^UT(nj  
#include "resource.h" // main symbols DJvmwFx  
class CHookApp : public CWinApp bfcQ(m5  
{ D^8]+2r  
 public: Zvz Zs  
  CHookApp(); M?l/_!QB  
  // Overrides m r"b/oM{  
  // ClassWizard generated virtual function overrides #m=TK7*v  
  //{{AFX_VIRTUAL(CHookApp) n@xC?D:t*  
 public: S-l<+O1fy  
  virtual BOOL InitInstance(); <ZO"0oz%  
  virtual int ExitInstance(); m/@ ;N,K  
  //}}AFX_VIRTUAL U{/d dCf7  
  //{{AFX_MSG(CHookApp) @6\Id7`Ea  
  // NOTE - the ClassWizard will add and remove member functions here. BdBwfH%:  
  // DO NOT EDIT what you see in these blocks of generated code ! ovm109fTx  
  //}}AFX_MSG ])F*)U  
  DECLARE_MESSAGE_MAP() @h7)M:l  
}; E/[>#%@i  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); O*0%AjT6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); tQ=3Oa[u  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {Tx"G9  
BOOL InitHotkey(); prtNfwJz1j  
BOOL UnInit(); LCBP9Rftvd  
#endif |H-%F?<{  
jN))|eD0x  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. !r\u,l^  
#include "stdafx.h" &:Q^j:  
#include "hook.h" (;\" K?  
#include <windowsx.h>  FZL"[3  
#ifdef _DEBUG ^UU@7cSi|G  
#define new DEBUG_NEW O2xbHn4  
#undef THIS_FILE `/ <y0H  
static char THIS_FILE[] = __FILE__; xqm-m  
#endif ;wGoEN  
#define MAX_KEY 100 'q>2WP|UY9  
#define CTRLBIT 0x04 1 S<E=7  
#define ALTBIT 0x02 ob3)bI oM  
#define SHIFTBIT 0x01 Fnqj^5  
#pragma data_seg("shareddata") ^wass_8  
HHOOK hHook =NULL; ^^ >j2=  
UINT nHookCount =0; R+sv?4k  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey V.w L  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT l,fwF ua  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey p : {,~ 1  
static int KeyCount =0; /]U),LbN  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 8*zORz  
#pragma data_seg() fQm3D%  
HINSTANCE hins; / R-1s  
void VerifyWindow(); wjtFZGx&  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) uNKf!\Y  
//{{AFX_MSG_MAP(CHookApp) J497 >w[  
// NOTE - the ClassWizard will add and remove mapping macros here. %-?k [DL6  
// DO NOT EDIT what you see in these blocks of generated code! ^%5 ;Sc1V  
//}}AFX_MSG_MAP _tlr8vL  
END_MESSAGE_MAP() 6~34L{u  
d+qeZGg^A  
CHookApp::CHookApp() Xsk/U++  
{ c T21  
 // TODO: add construction code here, f;D(X/"f]  
 // Place all significant initialization in InitInstance @\U;?N~k  
} vzX%x ul  
8u%rh[g'  
CHookApp theApp; v[~~q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) U8S<wf&  
{ t $m:  
 BOOL bProcessed=FALSE; `}:pUf  
 if(HC_ACTION==nCode)  "tT68  
 { cqYMzS t  
  if((lParam&0xc0000000)==0xc0000000){// Key up P(o GNKAS  
   switch(wParam) 4V<.:.k  
   { 9y'To JZ6  
    case VK_MENU: _|r/* (hh  
     MaskBits&=~ALTBIT; "]T1DG"  
     break; a#D \8;  
    case VK_CONTROL: + L [a  
     MaskBits&=~CTRLBIT; ?`= <*{_o  
     break; 'QSj-  
    case VK_SHIFT: =Q,D3F -+f  
     MaskBits&=~SHIFTBIT; bV$g]->4e  
     break; uK%0,!q  
    default: //judge the key and send message \J(kevX  
     break; _TwE ym.V  
   } |.OS7Gt?  
   for(int index=0;index<MAX_KEY;index++){ &( ZEs c  
    if(hCallWnd[index]==NULL) w-];!;%  
     continue; btOx\y}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;fYJ]5>  
    { :jy}V'bn$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); BN&eU'Dl]  
     bProcessed=TRUE; HCKocL/]h  
    } _BEDQb{"|  
   } x.9[c m-!  
  } yxtfyf|9 '  
  else if((lParam&0xc000ffff)==1){ //Key down ep6V2R  
   switch(wParam) 6&"*{E  
   { i"0*)$ h W  
    case VK_MENU: lSfPOx;*  
     MaskBits|=ALTBIT; =}" P;4:  
     break; nt%fJ k  
    case VK_CONTROL: /2Z7  
     MaskBits|=CTRLBIT; a|5<L  
     break; ]`q]\EH  
    case VK_SHIFT: y*Gq VA[  
     MaskBits|=SHIFTBIT; ^V~^[Yp  
     break; R5 i xG9  
    default: //judge the key and send message _'|C-j`u$  
     break; 9ec>#Vxx  
   } z57q |  
   for(int index=0;index<MAX_KEY;index++) $a|>>?8  
   { )EK\3q  
    if(hCallWnd[index]==NULL) S c ijf 9  
     continue; gj7'4 3 ?W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) EK Ac>g  
    { QFB2,k6jN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2K^xN]]rG  
     bProcessed=TRUE; 4Wu(Tps  
    } vjVa),2  
   } _H@8qR  
  } eNK6=D|  
  if(!bProcessed){ nf-6[dg  
   for(int index=0;index<MAX_KEY;index++){ 2uT@jfj:r  
    if(hCallWnd[index]==NULL) fo=@ X>S  
     continue; hh$i1n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) qYPgn _  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5s%FHa  
   } g7w#;E  
  } &k`/jl;u  
 } q&&uX-ez5W  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); m2l0`l~T8  
} (S?qxW?  
)afH:  
BOOL InitHotkey() y#P _ }Kfo  
{ >_#A*B|  
 if(hHook!=NULL){ g2vt(Gf;  
  nHookCount++; 3*F|`js"  
  return TRUE; @7t*X-P.;-  
 } K#N5S]2yb  
 else W6)XMl}n  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Y3ypca&P9  
  if(hHook!=NULL) UZL-mF:)&  
   nHookCount++; ug/P>0  
  return (hHook!=NULL); ,D.@6 bJW  
} 6J965eM'[  
BOOL UnInit() j'XND`3  
{ #%]?e N  
 if(nHookCount>1){ Qqd+=mgc  
  nHookCount--; -5\.\L3y)  
  return TRUE; FC4hvO(/m  
 } sDwE,f0h  
 BOOL unhooked = UnhookWindowsHookEx(hHook); :U faMe5  
 if(unhooked==TRUE){ aw3rTT(  
  nHookCount=0; }]pOR&o  
  hHook=NULL; h  m(  
 } B~3qEdoK5`  
 return unhooked; -}5dZ;  
} #b1/2=PA  
Zf?jnDA  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ZO\bCrk  
{ R;w1& Z  
 BOOL bAdded=FALSE; L @8[.  
 for(int index=0;index<MAX_KEY;index++){ nB |fw"  
  if(hCallWnd[index]==0){ )IuwI#pm  
   hCallWnd[index]=hWnd; ,f .#-  
   HotKey[index]=cKey; UvGX+M,z'  
   HotKeyMask[index]=cMask; F'55BY*!  
   bAdded=TRUE; jG^OF5.  
   KeyCount++; qjRp5  
   break; >kV=h?]Y  
  } )1&,khd/u  
 } ."j*4  
 return bAdded; 8 =3$U+  
} XOzZtt  
={nuz-3  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) c`V~?]I>  
{ 68!=`49r>  
 BOOL bRemoved=FALSE; \'x?VVw  
 for(int index=0;index<MAX_KEY;index++){ <gSZ<T  
  if(hCallWnd[index]==hWnd){ %[m%QP1;p  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ YifTC-Q;  
    hCallWnd[index]=NULL; !xD_=O  
    HotKey[index]=0; 3q1u9`4;  
    HotKeyMask[index]=0; D?cE$P  
    bRemoved=TRUE; n 4EZy<~m  
    KeyCount--; zj'uKBDl  
    break; ;Z#DB$o\  
   } cK2Us+h  
  } :;Wh!8+j  
 } G6j9,#2@  
 return bRemoved; $!"*h  
} v:Z.8m8D  
FuO'%3;c  
void VerifyWindow() gx6$:j;   
{ ZSW`/}Dp;  
 for(int i=0;i<MAX_KEY;i++){ f@J-6uQ7w  
  if(hCallWnd!=NULL){ C9 cQ} j:  
   if(!IsWindow(hCallWnd)){ 96CC5  
    hCallWnd=NULL; Fy]j33E  
    HotKey=0; -\fn\n  
    HotKeyMask=0; }MV=t7x9+  
    KeyCount--; T8J[B( )L  
   } V: ivnx*  
  } ,xIWyI.  
 } 3.I:`>;EO  
} s& WHKCb  
9@z"~H  
BOOL CHookApp::InitInstance() TWJ%? /d  
{ KfLp cV  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); WUqfY?5  
 hins=AfxGetInstanceHandle(); J9/}ZD^  
 InitHotkey(); u:&Lf  
 return CWinApp::InitInstance(); G |vG5$Nf  
} 97(*-e=e  
9p<ZSh  
int CHookApp::ExitInstance() V$<5`  
{ FG5t\!dt<  
 VerifyWindow(); )3~):+  
 UnInit(); [?Q$b5j/M  
 return CWinApp::ExitInstance(); +0WI;M4i  
} s:#\U!>0`  
/CN`U7:E  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file [P746b_\e  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) )k|_ CW~  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ n6 a=(T  
#if _MSC_VER > 1000 / L/hR4  
#pragma once /0qLMlL$  
#endif // _MSC_VER > 1000 B@2VI 1%  
>~k"C,6  
class CCaptureDlg : public CDialog YV>]c9!q  
{ yPza  
 // Construction o@KK/f  
 public: QGQ> shIeZ  
  BOOL bTray; IXef}%1N?  
  BOOL bRegistered; {z/Y~rf  
  BOOL RegisterHotkey(); 'rQ>Z A_8  
  UCHAR cKey; ')>&:~  
  UCHAR cMask; %2D9]L2Up  
  void DeleteIcon(); ULkhTB  
  void AddIcon(); u DpCW}  
  UINT nCount; \4OX]{  
  void SaveBmp(); ?ydqmj2[F  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor m|w-}s,  
  // Dialog Data >HY( Ij<  
  //{{AFX_DATA(CCaptureDlg) -(]s!,  
  enum { IDD = IDD_CAPTURE_DIALOG }; rt[w yz8  
  CComboBox m_Key; %Cz&7qf"  
  BOOL m_bControl; na1*^S`[  
  BOOL m_bAlt; I ;Sm<P7*  
  BOOL m_bShift; ? @Y'_f  
  CString m_Path; <wZ2S3RNA  
  CString m_Number; N3J;_=<4  
  //}}AFX_DATA |B;tv#mKD  
  // ClassWizard generated virtual function overrides :v!e8kM\x  
  //{{AFX_VIRTUAL(CCaptureDlg) 9I;d>%  
 public: ]hL `HP  
  virtual BOOL PreTranslateMessage(MSG* pMsg); t$lO~~atr  
 protected: zg2}R4h  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?@i_\<A2  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ]FNqNZ  
  //}}AFX_VIRTUAL sox0:9Oqnf  
  // Implementation s8/y|HN^  
 protected: vP{22P  
  HICON m_hIcon; #r}O =izi  
  // Generated message map functions _3YuPMaN  
  //{{AFX_MSG(CCaptureDlg) M3U*'A\  
  virtual BOOL OnInitDialog(); zFqlTUD`t  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); VNcxST15a  
  afx_msg void OnPaint(); wjm_bEi  
  afx_msg HCURSOR OnQueryDragIcon(); AD=vYDR+  
  virtual void OnCancel(); B~RVFc +  
  afx_msg void OnAbout(); jLRh/pbz4  
  afx_msg void OnBrowse(); [Grd?mc#  
  afx_msg void OnChange(); %|:Gn)8  
 //}}AFX_MSG OJGEX}3'  
 DECLARE_MESSAGE_MAP() `"/s,"c:D  
}; *+ql{\am4N  
#endif ?B"k9+%5ej  
""JTU6]MS  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file R>iRnrn:-  
#include "stdafx.h" tJ NJ S  
#include "Capture.h" #~(VOcRI  
#include "CaptureDlg.h" ? %9-5"U[  
#include <windowsx.h> AUm"^-@x#>  
#pragma comment(lib,"hook.lib") c05kHB$O  
#ifdef _DEBUG  M[^  
#define new DEBUG_NEW ueyz@{On~  
#undef THIS_FILE +; P8QZK6  
static char THIS_FILE[] = __FILE__; 75+#)hNa!P  
#endif ;|.^_Xs  
#define IDM_SHELL WM_USER+1 J .r^"K\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); bZE;}d  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); vjcG F'-  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Pde|$!Jo  
class CAboutDlg : public CDialog 2L<iIBSJwm  
{ Be=J*D!E=>  
 public: H <|ilL'fX  
  CAboutDlg(); kf8-#Q/B  
  // Dialog Data \~]HfDu  
  //{{AFX_DATA(CAboutDlg) McRAy%{z  
  enum { IDD = IDD_ABOUTBOX }; 8T7E.guYr  
  //}}AFX_DATA wE.CZ% f  
  // ClassWizard generated virtual function overrides _R,VNk  
  //{{AFX_VIRTUAL(CAboutDlg) Pd<s#  
 protected: &p)]Cl/`  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xpWx6  
  //}}AFX_VIRTUAL zq=X;}qYj  
  // Implementation a5/6DK>  
 protected: b1(7<o  
  //{{AFX_MSG(CAboutDlg) 3 %ppvvQ  
  //}}AFX_MSG F3XB};  
  DECLARE_MESSAGE_MAP() LyaFWx   
}; aL9 yNj}2  
/A8ua=Kn  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) (aAv7kB&  
{ {{G`0i2KV  
 //{{AFX_DATA_INIT(CAboutDlg) B^;P:S<yG  
 //}}AFX_DATA_INIT G234UjN%  
} L9|55z  
^usZ&9"@P  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Rr'#OxF  
{ b) k\?'j  
 CDialog::DoDataExchange(pDX); UE-<  
 //{{AFX_DATA_MAP(CAboutDlg) Z`UwXp_s  
 //}}AFX_DATA_MAP h%9>js^~  
} s#%$aQ|Fp  
yJCqP=  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) wx a?.  
 //{{AFX_MSG_MAP(CAboutDlg) u3"0K['3  
 // No message handlers ?s=O6D&   
 //}}AFX_MSG_MAP Vq'\`$_  
END_MESSAGE_MAP() 5r*5Co+  
eI+<^p_j2  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 77FI&*q  
: CDialog(CCaptureDlg::IDD, pParent) _GoV\wGKl  
{ LH=gNFgzt  
 //{{AFX_DATA_INIT(CCaptureDlg) #DBg8  
  m_bControl = FALSE; [Eeanl&x>  
  m_bAlt = FALSE; S>-x<'Os  
  m_bShift = FALSE; Z*+0gJ<Y  
  m_Path = _T("c:\\"); i `m&X6)\j  
  m_Number = _T("0 picture captured."); ?ztI8 I/  
  nCount=0; BB x359  
  bRegistered=FALSE; XX85]49`%  
  bTray=FALSE; BGtr=&Hq  
 //}}AFX_DATA_INIT B6N/nCvHK  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 n{d0}N =  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); E [:eMJR  
} zTgY=fuz  
j20/Q)=h  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Lro[ |A  
{ (=2-*((&(A  
 CDialog::DoDataExchange(pDX); eGwO!Lv}B  
 //{{AFX_DATA_MAP(CCaptureDlg) Mnu8d:$  
  DDX_Control(pDX, IDC_KEY, m_Key); pyvH [  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Z~g6C0  
  DDX_Check(pDX, IDC_ALT, m_bAlt); p<eu0B_V  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); `!`g&:Y  
  DDX_Text(pDX, IDC_PATH, m_Path); }V:B,:  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ''bh{ .x  
 //}}AFX_DATA_MAP {iGy@?d)zt  
} aVg~/  
Dq [ f  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0}'xoYv f  
//{{AFX_MSG_MAP(CCaptureDlg) N('=qp9  
 ON_WM_SYSCOMMAND() [>2iz  
 ON_WM_PAINT() s6q6)RD"  
 ON_WM_QUERYDRAGICON() I_1(jaY  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) I7@|{L1|FB  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) jR1o<]?  
 ON_BN_CLICKED(ID_CHANGE, OnChange) J0ys Z]  
//}}AFX_MSG_MAP lOp7rW]$  
END_MESSAGE_MAP() Oe)d|6=  
&kR*J<)V  
BOOL CCaptureDlg::OnInitDialog() 8t1XZ  
{ B(pxyv)  
 CDialog::OnInitDialog(); f`$F^=  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ,4Q1[K35B  
 ASSERT(IDM_ABOUTBOX < 0xF000); 3WVH8Sb  
 CMenu* pSysMenu = GetSystemMenu(FALSE); -w dbH`2Z"  
 if (pSysMenu != NULL) Dias!$g  
 { - w{`/  
  CString strAboutMenu; "{;E+-/ aL  
  strAboutMenu.LoadString(IDS_ABOUTBOX); wtl3Ex,DO  
  if (!strAboutMenu.IsEmpty()) =JkPE2mU  
  { v)b_bU]Hx  
   pSysMenu->AppendMenu(MF_SEPARATOR); 4. =jKj9j  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ~'9\y"N1  
  }  uc<JF=  
 } kxanzsSr9  
 SetIcon(m_hIcon, TRUE); // Set big icon Y>/T+ub  
 SetIcon(m_hIcon, FALSE); // Set small icon (-no`j  
 m_Key.SetCurSel(0); 5}3#l/  
 RegisterHotkey(); P<%}!Y  
 CMenu* pMenu=GetSystemMenu(FALSE); W\c1QY$E  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _o52#Q4   
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); yTxrbE  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Vktc  
 return TRUE; // return TRUE unless you set the focus to a control )+ V)]dS@%  
} o=nF.y  
qj7 }]T_  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) W?F Q  
{ [u $X.=(  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) dwpE(G y6c  
 { RoFOjCc>D.  
  CAboutDlg dlgAbout; tEN8S]X  
  dlgAbout.DoModal(); 0!Vza?9  
 } aw923wEi  
 else ~n"?*I`  
 { O"GuVC}B  
  CDialog::OnSysCommand(nID, lParam); k-Z :z?M  
 } f7SMO-3a  
} e7Sp?>-d  
"5!T-Z+F  
void CCaptureDlg::OnPaint() \{a!Z&df  
{ 6!`GUU  
 if (IsIconic()) n)Zu>  
 { YMU2^,3  
  CPaintDC dc(this); // device context for painting %/4_|.8u  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ]vflx^<?  
  // Center icon in client rectangle xZ]QT3U+  
  int cxIcon = GetSystemMetrics(SM_CXICON); +n%d,Pz  
  int cyIcon = GetSystemMetrics(SM_CYICON); @DNwzdP  
  CRect rect; Y#5v5  
  GetClientRect(&rect); J2Mq1*Vpq  
  int x = (rect.Width() - cxIcon + 1) / 2; {E;oirv&  
  int y = (rect.Height() - cyIcon + 1) / 2; ri`;   
  // Draw the icon uq2C|=M-x\  
  dc.DrawIcon(x, y, m_hIcon); kz*6%Cg*~  
 } P;G]qV%  
 else :O'QL,  
 { U2Tw_  
  CDialog::OnPaint(); ^OOoo2  
 } 3&!v"ms  
} Eq?U$eE  
I/*^s  
HCURSOR CCaptureDlg::OnQueryDragIcon() *Fg)`M3g  
{ WM;5/;bB  
 return (HCURSOR) m_hIcon; xHD$0eq  
} b['v0x  
Pav W@  
void CCaptureDlg::OnCancel() kz/"5gX:  
{ 8RI'Fk{  
 if(bTray) Q!!u=}GYK  
  DeleteIcon(); %a?\y_a=b  
  CDialog::OnCancel(); n) j0h-  
} I 6'!b/  
p/qu4[Mm  
void CCaptureDlg::OnAbout() P6I<M}p  
{ (!PsK:wc  
 CAboutDlg dlg; %g~&$oZmq  
 dlg.DoModal(); <L('RgA@X  
} ~: fSD0  
Ou4 `#7FR  
void CCaptureDlg::OnBrowse() %>y`VN D  
{ ' <?=!&\D  
 CString str; 5WA:gygB&  
 BROWSEINFO bi; /9A6"Z  
 char name[MAX_PATH]; 5\EnD, y  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); R,s}<N$  
 bi.hwndOwner=GetSafeHwnd(); r1Hh @sxn  
 bi.pszDisplayName=name; lWn}afI  
 bi.lpszTitle="Select folder"; 6V"u ovN2  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; I+F >^4_d  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); !rF1Remw  
 if(idl==NULL) (hBph+  
  return; o`Af6C;Q  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Qo!F?i/ n  
 str.ReleaseBuffer(); w~q ]&  
 m_Path=str; g=KvCqJN  
 if(str.GetAt(str.GetLength()-1)!='\\') `fOp>S^Q4  
  m_Path+="\\"; {b'  
 UpdateData(FALSE); sYfm]Faz  
} )vUS).;S`  
VJP#  
void CCaptureDlg::SaveBmp() JeN]sK)8x  
{ A0Q`Aqs  
 CDC dc; 764eXh  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); $)  M2  
 CBitmap bm; ff7#LeB9  
 int Width=GetSystemMetrics(SM_CXSCREEN); !Eg2#a?  
 int Height=GetSystemMetrics(SM_CYSCREEN); &8pGq./lr=  
 bm.CreateCompatibleBitmap(&dc,Width,Height); !C|Z+w9Y  
 CDC tdc; 3 l}9'j  
 tdc.CreateCompatibleDC(&dc); ~;z] _`_Va  
 CBitmap*pOld=tdc.SelectObject(&bm); M~7Cb>%<  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); -\USDi(  
 tdc.SelectObject(pOld); w?zy/+N~  
 BITMAP btm; p>i8aN  
 bm.GetBitmap(&btm); $)nPj_h  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; +V(^ "Z~  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); vS"h`pL  
 BITMAPINFOHEADER bih; X-X`Z`o  
 bih.biBitCount=btm.bmBitsPixel; =1k%T{>  
 bih.biClrImportant=0; [y}h   
 bih.biClrUsed=0; j{'_sI{{  
 bih.biCompression=0; JS/ChoU  
 bih.biHeight=btm.bmHeight; lo1bj*Y2  
 bih.biPlanes=1; \#]C !JQ  
 bih.biSize=sizeof(BITMAPINFOHEADER); pY[b[ezb  
 bih.biSizeImage=size; YR? E z<p  
 bih.biWidth=btm.bmWidth; |h%HUau  
 bih.biXPelsPerMeter=0; eXD~L&s[  
 bih.biYPelsPerMeter=0; 7W*a+^   
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); XjCx`bX^<  
 static int filecount=0; :?j=MV  
 CString name; :nR80]  
 name.Format("pict%04d.bmp",filecount++); }K@m4`T  
 name=m_Path+name; )-o jm$  
 BITMAPFILEHEADER bfh; NMfHrYHbh  
 bfh.bfReserved1=bfh.bfReserved2=0; /qJCp![X  
 bfh.bfType=((WORD)('M'<< 8)|'B'); oc]:Ty  
 bfh.bfSize=54+size; ul~6zBKO   
 bfh.bfOffBits=54; =|``d-  
 CFile bf; d=meh4Y  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %[5GGd5w  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ke!  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); S~ Z<-@S  
  bf.WriteHuge(lpData,size); )/vom6y*   
  bf.Close(); !h4A7KBYG  
  nCount++; ,Jh#$mil  
 } 9l "=]7~%  
 GlobalFreePtr(lpData); JV@G9PT  
 if(nCount==1) 3!\h'5{  
  m_Number.Format("%d picture captured.",nCount); |OAM;@jH  
 else 9r+'DX?>  
  m_Number.Format("%d pictures captured.",nCount); Ww60-d}}Q  
  UpdateData(FALSE); (sQXfeMz  
} DQ3 L=  
PVH Or^  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ^"p . 3Hy  
{ VBix8|  
 if(pMsg -> message == WM_KEYDOWN) I|c!:4  
 { Xp9I3nd|  
  if(pMsg -> wParam == VK_ESCAPE) NA/`LaJ  
   return TRUE; ^"D^D`$@  
  if(pMsg -> wParam == VK_RETURN) {Q37a=;,  
   return TRUE; NN2mOJ:-  
 } W6}>iB  
 return CDialog::PreTranslateMessage(pMsg); q^<HG]  
} j'U1lEZm2  
K:jn^JN$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) = c Z24I  
{ Axns  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ S<NK!89  
  SaveBmp(); 8#lq:  
  return FALSE; hrq% {!Z  
} m7y[Y  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ;5L^)Nyd  
 CMenu pop; GC7WRA  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); qzJ<9H  
 CMenu*pMenu=pop.GetSubMenu(0); ZLxa|R7  
 pMenu->SetDefaultItem(ID_EXITICON); .MG83Si  
 CPoint pt; KUYwc@si\  
 GetCursorPos(&pt); =f y|Dm74  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); &PRoT#,  
 if(id==ID_EXITICON) J,)ytw]  
  DeleteIcon(); [|1I.AZ{  
 else if(id==ID_EXIT) aQ $sn<-l  
  OnCancel(); xSd&xwP  
 return FALSE; BCe'J!  
} ^Z#G_%\Y:  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +|d]\WlJ  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) [.fh2XrVM  
 AddIcon(); "Kp#Lx  
 return res; @L~erg>8=  
} ]"HaE-`%  
!CX WoM  
void CCaptureDlg::AddIcon() *!$Z5Im  
{ a-E}3a  
 NOTIFYICONDATA data; -$o0P'Vx  
 data.cbSize=sizeof(NOTIFYICONDATA); 5v)bs\x6  
 CString tip; o ?vGI=  
 tip.LoadString(IDS_ICONTIP); Q17dcgd  
 data.hIcon=GetIcon(0);  |@'O3KA  
 data.hWnd=GetSafeHwnd(); /P@%{y  
 strcpy(data.szTip,tip); cZ?$_;=  
 data.uCallbackMessage=IDM_SHELL; 3k9n*jY0  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <fG\J  
 data.uID=98; rkR5>S( 2M  
 Shell_NotifyIcon(NIM_ADD,&data); D0xQXC3$`  
 ShowWindow(SW_HIDE); qjhV/fsfb  
 bTray=TRUE; F/BR#J1  
} '7el`Ff  
jw=PeT|  
void CCaptureDlg::DeleteIcon() GnW MI1$  
{ ;j/$%lC  
 NOTIFYICONDATA data; $Y6\m`  
 data.cbSize=sizeof(NOTIFYICONDATA); \H:T)EVy  
 data.hWnd=GetSafeHwnd(); CA0XcLiFt  
 data.uID=98; rX?ZUw?u&  
 Shell_NotifyIcon(NIM_DELETE,&data); 9/{zS3h3  
 ShowWindow(SW_SHOW); 8!Wh`n<  
 SetForegroundWindow(); ').) 0;  
 ShowWindow(SW_SHOWNORMAL); Rv9jLH  
 bTray=FALSE; 9D1WUUa  
} E3O^Tg?j  
}|=/v( D  
void CCaptureDlg::OnChange() ]5S`y{j1  
{ lJ-PW\P  
 RegisterHotkey(); XP?jsBE  
} 0?>(H(D^/  
zq{UkoME  
BOOL CCaptureDlg::RegisterHotkey() I_v}}h{  
{ &N/t%q  
 UpdateData(); ?=M ?v;8  
 UCHAR mask=0; j8&NscK)  
 UCHAR key=0; $N)G:=M!s  
 if(m_bControl) zVw5(Tc  
  mask|=4; \OVtvJV]  
 if(m_bAlt) `R8&(kQ  
  mask|=2; d6QrB"J`  
 if(m_bShift) 9m$;C'}Z  
  mask|=1; <Pt?N2]A|  
  key=Key_Table[m_Key.GetCurSel()]; Z)W8Of_  
 if(bRegistered){ PmE)FthdP(  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Tl2t\z+ps  
  bRegistered=FALSE; q%d G>!  
 }   < v]  
 cMask=mask; p 4> ThpX  
 cKey=key; 70c]|5  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); lJu^Bcrv  
 return bRegistered; ( 4L/I  
} BM,hcT r?  
v{a%TA9-  
  四、小结 Q!1;xw~  
WZNq!K H  
  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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