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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: .!yw@kg  
  BjAmM*k  
  一、实现方法 M'}iIO`L  
'G8.)eTA'  
  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: [.LbX`K:  
n81z 0lnr  
#pragma data_seg("shareddata") [O\[,E"K  
HHOOK hHook =NULL; //钩子句柄 zMbz_22*  
UINT nHookCount =0; //挂接的程序数目 U9%#(T$  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 D>m!R[!o  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 qcR"i+b  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey m6YDyQC  
static int KeyCount =0; obtXtqew  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 xq\A TON  
#pragma data_seg() f ,WAl\  
Oq4J$/%  
  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。 d'*:2;)g^  
(f>~+-IL  
  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: p}9bZKyf  
A i5|N  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR d,*#yzO  
cKey,UCHAR cMask) KQ2jeJ/pj  
{ \K%A}gnHe  
 BOOL bAdded=FALSE; JVt(!%K}&  
 for(int index=0;index<MAX_KEY;index++){ n Wb0S  
  if(hCallWnd[index]==0){ D/Hob  
   hCallWnd[index]=hWnd; |n q}#  
   HotKey[index]=cKey; `AcT}. u  
   HotKeyMask[index]=cMask; 2-x#|9  
   bAdded=TRUE; 0pl |  
   KeyCount++; sEm064  
   break; i2Cw#x0s  
  } ;.|).y1/`  
 } }.74w0~0^  
 return bAdded; e{fm7Cc)D  
} \A=:6R%Qb  
//删除热键 ' Y cVFi  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $*z>t*{7  
{ #t?tt,nc}  
 BOOL bRemoved=FALSE; j/PNi@  
 for(int index=0;index<MAX_KEY;index++){ iw?*Wp25  
  if(hCallWnd[index]==hWnd){ ZINqIfc  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ L0dj 76'M  
    hCallWnd[index]=NULL; iR6w)  
    HotKey[index]=0; cgF?[Z+x  
    HotKeyMask[index]=0; 3|9 U`@  
    bRemoved=TRUE; #0gwN2Nv"L  
    KeyCount--; kSq1Q#Bxq  
    break; Sz#dld Mz  
   } 7-`iI(N<  
  } /4lm=ZE/  
 } 9>1Gj-S2:  
 return bRemoved; 5*IfI+}  
} yx&'W_Q@  
jk-e/C  
CF_pIfbaf  
  DLL中的钩子函数如下: 4;.y>~z  
iQJ[?l`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ouf91<n  
{ 64w4i)?eM[  
 BOOL bProcessed=FALSE; v\3}5v%YI  
 if(HC_ACTION==nCode) 3r]N\c  
 { - }2AXP2q  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 @ZTsl ?  
   switch(wParam) `/\Z{j0_  
   {  DU=rsePWE  
    case VK_MENU: <Zn -P  
     MaskBits&=~ALTBIT; Qkq9oZ  
     break; .uwD;j +#  
    case VK_CONTROL: !i77v, (#|  
     MaskBits&=~CTRLBIT; +8~C&K:  
     break; i1k#WgvZR  
    case VK_SHIFT: qmWn$,ax  
     MaskBits&=~SHIFTBIT;  Re^~8q[  
     break; /2#1Oi)o  
    default: //judge the key and send message l1MVC@'pvP  
     break; y1@*)| r  
   } oGXndfd"  
   for(int index=0;index<MAX_KEY;index++){ Hd9vS"TN]  
    if(hCallWnd[index]==NULL) [9>h! khs  
     continue; !=yNj6_f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4A@77#:J5  
    { /yn%0Wish  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); xhmrep6+<  
     bProcessed=TRUE; _)6N&u8  
    } { i2QLS  
   } L}x,>hbT  
  } d9kN @W  
  else if((lParam&0xc000ffff)==1){ //有键按下 klwNeGF]N  
   switch(wParam) _0: }"!Gq  
   { S#wy+*  
    case VK_MENU: kvo V?<!  
     MaskBits|=ALTBIT; N +M^e`H  
     break; MzudCMF  
    case VK_CONTROL: V.U9Q{y"  
     MaskBits|=CTRLBIT; rjLPX  
     break; wSwDhOX=  
    case VK_SHIFT: YN>k5\M_v  
     MaskBits|=SHIFTBIT; MrGq{,6C  
     break; >*FHJCe  
    default: //judge the key and send message XwNJHOaF  
     break; 5B76D12  
   } C~:@ETcbil  
   for(int index=0;index<MAX_KEY;index++){ DtrR< &m  
    if(hCallWnd[index]==NULL) ~vMdIZ.h  
     continue; g!*5@k|C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7Fd`M To  
    { p,'Z{7HG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); aF (L_  
     bProcessed=TRUE; !|@hU/  
    } IVblS iFF  
   } -4IHs=`;I  
  } 6-oy%OnN  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 2S^:fm}  
   for(int index=0;index<MAX_KEY;index++){ rrL gBeQa  
    if(hCallWnd[index]==NULL) Un[ 0or  
     continue; F\G-. 1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) AZgeu$:7p<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); THl={,Rw`  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 1q7Y,whp  
   } -fm1T|>#  
  } ~aZy52H_#.  
 } KqI<#hUl  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); h]{V/  
} `z)q/;}fC  
ZD(VH6<g%  
  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: lNwqWOWy  
tW)K pX  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); yur5" $n  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a6<UMJ  
pSC\[%K  
  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: #FNSE*Y  
o,D7$WzL  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <jwQ&fm)/R  
{ "7X[@xX@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) {k"t`uo_  
 { ah9P C7[  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 (O@fgBM  
  SaveBmp(); uZ/XI {/  
  return FALSE; g;n6hXq4  
 } 7XU$O$C  
 …… //其它处理及默认处理 b$W~w*O   
} %&[=%zc  
#PJHwvr  
"z6 xS;  
  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。 |3{"ANmm'  
WNmG'hlA  
  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。 |@*3 nb8  
Ua2waA  
  二、编程步骤 wS"`~Ql_  
Dm+[cA"I  
  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"; *&nIxb60b{  
BJNZH#"  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; J\%SAit@  
JOUZ"^v  
  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; mQka?_if)  
z9qF<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; d"0=.sA  
5ca!JLs  
  5、 添加代码,编译运行程序。 CAT{)*xc  
f'WRszrF  
三、程序代码 bCL/"OB  
x=VLTH/oo  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL RoLN#  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 089 <B& <  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ]p-x ds#d  
#if _MSC_VER > 1000 /a7N:Z_Bz  
#pragma once xMr=tU1C  
#endif // _MSC_VER > 1000 kE`Fg(M  
#ifndef __AFXWIN_H__ 8W"Xdv{  
#error include 'stdafx.h' before including this file for PCH \WPy9kRU  
#endif /Y#Q<=X  
#include "resource.h" // main symbols S\dG>F>S  
class CHookApp : public CWinApp ]VcuD05"C  
{ l&Cy K#B:\  
 public: N eC]MW  
  CHookApp(); 9@^N* E+  
  // Overrides =_=0l+\}  
  // ClassWizard generated virtual function overrides {\u6Cjx  
  //{{AFX_VIRTUAL(CHookApp) X@pcL{T!  
 public: i[4t`v'Dk  
  virtual BOOL InitInstance(); @=NTr  
  virtual int ExitInstance(); G vTA/zA  
  //}}AFX_VIRTUAL k@ So l6  
  //{{AFX_MSG(CHookApp) `P/87=h  
  // NOTE - the ClassWizard will add and remove member functions here. ^9zlxs`<d  
  // DO NOT EDIT what you see in these blocks of generated code ! ZuNUha&a  
  //}}AFX_MSG S[5OTwa8L  
  DECLARE_MESSAGE_MAP() #DA,*  
}; K +l-A>Ic  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); U9Gg#M4tY  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); vtw97G  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ecMpU8}rR  
BOOL InitHotkey(); Ie7S'.Lmq  
BOOL UnInit(); q${+I(b,  
#endif n3_| # 1Qu  
%{B4M#~  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. >uP1k.z'I  
#include "stdafx.h" ufB9\yl{~  
#include "hook.h" 2UeK%-~W?  
#include <windowsx.h> Xk?Y  
#ifdef _DEBUG XYze*8xUb  
#define new DEBUG_NEW j*_>/gi  
#undef THIS_FILE q"-+`;^7(-  
static char THIS_FILE[] = __FILE__; U]PsL3:  
#endif kIJ=]wU|v  
#define MAX_KEY 100 _T(77KLn;  
#define CTRLBIT 0x04 b>@fHmpwD  
#define ALTBIT 0x02 ZfU &X{  
#define SHIFTBIT 0x01 _Rk>yJD7s  
#pragma data_seg("shareddata") vs2xx`Y<Lq  
HHOOK hHook =NULL; ,?c=v`e  
UINT nHookCount =0; Zjn![  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey (vPE?^}b  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT '-V[t yE  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey l9+)h }  
static int KeyCount =0; X&gXhr#dL\  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift tpQ8 m(  
#pragma data_seg() |[iEi  
HINSTANCE hins; }*|aVBvU  
void VerifyWindow(); ZK`x(h{p)  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) L.x`Jpq(3  
//{{AFX_MSG_MAP(CHookApp) + %H2;8{F  
// NOTE - the ClassWizard will add and remove mapping macros here. :v%iF!+.P  
// DO NOT EDIT what you see in these blocks of generated code! Q94p*]W"  
//}}AFX_MSG_MAP ow7*HN*  
END_MESSAGE_MAP() c8oE,-~  
+:3p*x%1H  
CHookApp::CHookApp() A",Xn/d  
{ F> b<t.yV  
 // TODO: add construction code here, g+QNIM>  
 // Place all significant initialization in InitInstance J:dNV <A^  
} b8h6fB:2  
~EO=;a_  
CHookApp theApp; ge[&og/$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 97n,^t2F\  
{ <ahcE1h  
 BOOL bProcessed=FALSE; ZW ZKyJQ  
 if(HC_ACTION==nCode) ^)1!TewCY  
 { h{CMPJjD  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8nTdZu  
   switch(wParam) bJB* w  
   { {W%/?d9m  
    case VK_MENU: BFPy~5W  
     MaskBits&=~ALTBIT; i)[~]D.EH8  
     break; jF 6[+bW<  
    case VK_CONTROL: eo<=Q|nI&  
     MaskBits&=~CTRLBIT; GC)xQZU)s  
     break; *]e 9/f  
    case VK_SHIFT: TB#oauJm,  
     MaskBits&=~SHIFTBIT; p;rT#R&6>  
     break; EoOwu-{  
    default: //judge the key and send message ;|.IUXEgcF  
     break; V&>mD"~MP  
   } r(Y@;  
   for(int index=0;index<MAX_KEY;index++){ k7=mxXF  
    if(hCallWnd[index]==NULL) lt|UehJ F  
     continue; ePY69!pO5e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ol@LLT_m  
    { TN.&FDqC9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); RQW<Sp~  
     bProcessed=TRUE; YA@OA$`E  
    } 6@J)k V  
   } $jN,] N~  
  } F17nWvF  
  else if((lParam&0xc000ffff)==1){ //Key down =Cp}iM  
   switch(wParam) ZZU"Q7`^  
   { ' 4 Kf  
    case VK_MENU: gro@+^DmT  
     MaskBits|=ALTBIT; $-lP"m@}  
     break; /@9-D 4  
    case VK_CONTROL: pd oCV  
     MaskBits|=CTRLBIT; sRSy++FRF  
     break; *_tJ;  
    case VK_SHIFT: k1_ 3\JO"6  
     MaskBits|=SHIFTBIT; H:`[$ ^  
     break; h7[PU^m  
    default: //judge the key and send message K*oWcsu  
     break; &+7G|4!y  
   } J@Qw6J  
   for(int index=0;index<MAX_KEY;index++) XkuZ2(  
   { yWZ%|K~$  
    if(hCallWnd[index]==NULL) qb$f,E[  
     continue; X] v.Yk=wu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k?ksv+e\  
    { KHt.g`1:R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); (C!33s1  
     bProcessed=TRUE; /@f3|L<1@V  
    } ]z 5gC`E0  
   } Xw<Nnvz6  
  } "~aCW~  
  if(!bProcessed){ N TL`9b  
   for(int index=0;index<MAX_KEY;index++){ (ZHEPN  
    if(hCallWnd[index]==NULL) ?o.Q  
     continue; .RxAYf|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Zn"1qLPF  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \!,qXfTMB  
   } |k=L&vs  
  } @Xq3>KJ_)H  
 } L\y>WR%s  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2?nhkast#=  
} exL<cN  
yXL]uh#b  
BOOL InitHotkey() PH3#\ v.   
{ PV/S zfvIq  
 if(hHook!=NULL){ Mwd(?o  
  nHookCount++; o;2QZ"v  
  return TRUE; ~$Pz`amT|  
 } FT.;}!"l  
 else aC=D_JJ\  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); )]3(ue  
  if(hHook!=NULL) 5<KY}  
   nHookCount++; h`,!p  
  return (hHook!=NULL); x1{gw 5:  
} ay,E!G&H  
BOOL UnInit() s7}46\/U  
{ -P|st;?#  
 if(nHookCount>1){ 6zJfsKf$  
  nHookCount--; -VlXZj@u+  
  return TRUE; L/n?1'he  
 } 2q ,> *B?  
 BOOL unhooked = UnhookWindowsHookEx(hHook); #iAEcC0k5  
 if(unhooked==TRUE){ q+Cq&|4 ?2  
  nHookCount=0; o$_,2$>mn  
  hHook=NULL; }0?\H)/edP  
 } B M$+r(#t  
 return unhooked; +$H`/^a.  
} J)leRR&  
',P E25Z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &?gvW//L2  
{ 9 WhZ= Xk  
 BOOL bAdded=FALSE;  ]7yr.4?a  
 for(int index=0;index<MAX_KEY;index++){ }Pn]j7u!  
  if(hCallWnd[index]==0){ 27-GfC=7*  
   hCallWnd[index]=hWnd; ^E(:nxQ6s  
   HotKey[index]=cKey;  dr iw\  
   HotKeyMask[index]=cMask; 9k[>(LC  
   bAdded=TRUE; KWH l+p L  
   KeyCount++; W6 U**ir.  
   break; [:(^n0%  
  } _M;M-hk/  
 } Uc?#E $X  
 return bAdded; hbg:}R=B<  
} U%nLo[k  
vMB`TpZ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Wy`ve~y  
{ :AM5EO  
 BOOL bRemoved=FALSE; BHa'`lCb  
 for(int index=0;index<MAX_KEY;index++){ -%eBip,'yl  
  if(hCallWnd[index]==hWnd){ pZg}7F{$  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -@EAL:kY  
    hCallWnd[index]=NULL; $ 'obj  
    HotKey[index]=0; T,D(Xh  
    HotKeyMask[index]=0; P 4|p[V8  
    bRemoved=TRUE; ^<VJ8jk<  
    KeyCount--; l@OY8z-_  
    break; V"`t*m$  
   } C[xY 0<^B  
  } C>:'@o Z  
 } :]hNw1e  
 return bRemoved; ?'$Yj>R6  
} "$Mz>]3&q  
%2jRJ  
void VerifyWindow() OmR) W'  
{ yxx'g+D*  
 for(int i=0;i<MAX_KEY;i++){ .h7`Q{  
  if(hCallWnd!=NULL){ (6Tvu5*4U  
   if(!IsWindow(hCallWnd)){ L H8iHB  
    hCallWnd=NULL; e(~9JP9  
    HotKey=0; v?=y9lEH@%  
    HotKeyMask=0; Qmg2lP.)  
    KeyCount--; /eO :1c  
   } 5SNa~ kC&  
  } y`|86` Y  
 } x<fF1];  
} QU;bDNq,c  
_P{f+HxU  
BOOL CHookApp::InitInstance() !Enq2  
{ qLYz-P'ik  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); +\_c*'K>  
 hins=AfxGetInstanceHandle(); 7H l>UX,|  
 InitHotkey(); s1GR!*z>  
 return CWinApp::InitInstance(); L HW\A8  
} wJ%;\06  
psFY=^69o  
int CHookApp::ExitInstance() aVvma=  
{ cM hBOm*  
 VerifyWindow(); !K[UJQ s\  
 UnInit(); @?vC4+'  
 return CWinApp::ExitInstance(); lPyY  
} h%%ryQQ&<  
X;&Iu{&=  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *t%Z'IA  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) >2t.7UhDI  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ QHDR* tB:{  
#if _MSC_VER > 1000 H-&T)  
#pragma once qeUT]* w  
#endif // _MSC_VER > 1000 T@%\?=P  
\}Al85  
class CCaptureDlg : public CDialog omMOA  
{ M '#a.z%  
 // Construction ) UCc!  
 public: 4OaU1Y[  
  BOOL bTray;  mPL0s  
  BOOL bRegistered; l+A)MJd oj  
  BOOL RegisterHotkey(); abD@0zr  
  UCHAR cKey; 7 'q *(v  
  UCHAR cMask; ({OQ JBC  
  void DeleteIcon(); z?^oy.  
  void AddIcon(); sg8[TFX@Z  
  UINT nCount; vc0LV'lmg  
  void SaveBmp(); -|GKtZ]}  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor L</k+a?H!  
  // Dialog Data &,l(2z[  
  //{{AFX_DATA(CCaptureDlg) bFIM07  
  enum { IDD = IDD_CAPTURE_DIALOG }; CkV5PU  
  CComboBox m_Key; D3B]  
  BOOL m_bControl; F[v:&fle  
  BOOL m_bAlt; @y'0_Y0-B  
  BOOL m_bShift; jF}-dfe  
  CString m_Path; Y}]-o9Rl  
  CString m_Number; k2@]nW"S  
  //}}AFX_DATA |M&4[ka}  
  // ClassWizard generated virtual function overrides e\em;GTy  
  //{{AFX_VIRTUAL(CCaptureDlg)  k^Q.lb {  
 public: \xlG3nz  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Mg~4) DW]  
 protected: lA pZC6Iwk  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `a%MD>R_Lg  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 9Pb6Z}  
  //}}AFX_VIRTUAL [l3ys  
  // Implementation Ptc+ypTu  
 protected: ]rv4O@||w  
  HICON m_hIcon; Z5E; FGPb  
  // Generated message map functions &+n9T?+b  
  //{{AFX_MSG(CCaptureDlg) :KgH7s}  
  virtual BOOL OnInitDialog(); CLTkyS)C  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); `BQv;NtP  
  afx_msg void OnPaint(); e P,bFc  
  afx_msg HCURSOR OnQueryDragIcon(); !~&& &85  
  virtual void OnCancel(); Q~tXT_  
  afx_msg void OnAbout(); L R\LC6kM  
  afx_msg void OnBrowse();  vTgx7gP  
  afx_msg void OnChange(); 'Oj 1@0*0  
 //}}AFX_MSG X@"G1j >/  
 DECLARE_MESSAGE_MAP() fZezDm(Q  
}; (Vr%4Z8  
#endif 4EHrd;|   
x9,jXd  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file F#>00b{Q  
#include "stdafx.h" zGFD71=#  
#include "Capture.h" MoE&)~0u&  
#include "CaptureDlg.h" <)p.GAZ  
#include <windowsx.h> R0}1:1}$Sn  
#pragma comment(lib,"hook.lib") s(nT7x+W  
#ifdef _DEBUG 0|RofL&o  
#define new DEBUG_NEW 4;I\% qes  
#undef THIS_FILE 0_eqO'"  
static char THIS_FILE[] = __FILE__; HT6 [Z1  
#endif G.H8 ><%  
#define IDM_SHELL WM_USER+1 : oXSh;\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); P+0'^:J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); eD?&D_l~6  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; cf88Fd6l/  
class CAboutDlg : public CDialog X>Vc4n<}  
{ \c -m\|  
 public: Vw1>d+<~-)  
  CAboutDlg(); '< U&8?S  
  // Dialog Data HbegdbTJ  
  //{{AFX_DATA(CAboutDlg) BYB4- ,  
  enum { IDD = IDD_ABOUTBOX }; d/bimQ  
  //}}AFX_DATA b2OwLt9  
  // ClassWizard generated virtual function overrides r*+~(83k  
  //{{AFX_VIRTUAL(CAboutDlg) 9h amxi  
 protected: rXi&8R[  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support J5G<Y*q  
  //}}AFX_VIRTUAL n@8Y6+7i  
  // Implementation T82 `-bZ  
 protected: J, -.5  
  //{{AFX_MSG(CAboutDlg) } Bf@69  
  //}}AFX_MSG !+%gJiu:  
  DECLARE_MESSAGE_MAP() Jh3  
}; Jy)=TJ!y  
i%-yR DIX  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Hz.i$L0}  
{ "[N2qJ}p  
 //{{AFX_DATA_INIT(CAboutDlg) )X0=z1$  
 //}}AFX_DATA_INIT '4 *0Pw  
} L5bq\  
h mRmU{(Y  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) p^pd7)sBr  
{ '2.ey33V  
 CDialog::DoDataExchange(pDX); ij$NTY=u  
 //{{AFX_DATA_MAP(CAboutDlg) Kk8wlC  
 //}}AFX_DATA_MAP ~#E&E%sJ  
} )#m{"rk[x,  
|M;Nq@bRv  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) SaXt"Ju,AH  
 //{{AFX_MSG_MAP(CAboutDlg) klUV&O+=%  
 // No message handlers l zFiZx  
 //}}AFX_MSG_MAP 46=E- Tq  
END_MESSAGE_MAP() 3gUY13C}:p  
.b,\.0N  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) $5i\D rs  
: CDialog(CCaptureDlg::IDD, pParent) b-_l&;NWg  
{ @rYZ0`E9  
 //{{AFX_DATA_INIT(CCaptureDlg) LO_Xr j  
  m_bControl = FALSE; i{fw?))+  
  m_bAlt = FALSE; t{] 6GlW  
  m_bShift = FALSE; P8YnKyI,.  
  m_Path = _T("c:\\"); BQ6$T&  
  m_Number = _T("0 picture captured."); ! V.]mI  
  nCount=0; 16 AlmegDk  
  bRegistered=FALSE; +ywz@0nx  
  bTray=FALSE; { 4j<X5V  
 //}}AFX_DATA_INIT :zU4K=kR  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ~!({U nt+'  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 8WytvwB}  
} 2U[/"JL  
>)WE3PT/O"  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) u.2X "  
{ k{f1q>gd  
 CDialog::DoDataExchange(pDX); f! +d*9  
 //{{AFX_DATA_MAP(CCaptureDlg) fz|*Plv  
  DDX_Control(pDX, IDC_KEY, m_Key); D9g*+KM&  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); `:iMGq ZN  
  DDX_Check(pDX, IDC_ALT, m_bAlt); (csk   
  DDX_Check(pDX, IDC_SHIFT, m_bShift); sccLP_#Z  
  DDX_Text(pDX, IDC_PATH, m_Path); . V!5Ui<  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 2?ue.1C  
 //}}AFX_DATA_MAP +O8[4zn&k  
} bSIY|/d+  
GG#-x$jK  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) vE[d& b[  
//{{AFX_MSG_MAP(CCaptureDlg) vu.ug$T  
 ON_WM_SYSCOMMAND() Aa9l-:R  
 ON_WM_PAINT() | d*<4-:  
 ON_WM_QUERYDRAGICON() $(62j0mS>  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) @{IX do  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) <2(X?,N5BD  
 ON_BN_CLICKED(ID_CHANGE, OnChange) \l=A2i7TQ  
//}}AFX_MSG_MAP vVBWhY]  
END_MESSAGE_MAP() O.dZ3!!+  
!*c%Dj  
BOOL CCaptureDlg::OnInitDialog() !S<p"   
{ SVa^:\"$[  
 CDialog::OnInitDialog(); glch06  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ?.,F3@W "  
 ASSERT(IDM_ABOUTBOX < 0xF000); Ge)G.>c  
 CMenu* pSysMenu = GetSystemMenu(FALSE); (1=@.srAzK  
 if (pSysMenu != NULL) |Gq3pL<jkC  
 { _oZ3n2v}@  
  CString strAboutMenu; !IJ YaQ6z  
  strAboutMenu.LoadString(IDS_ABOUTBOX); r`ftflNh(  
  if (!strAboutMenu.IsEmpty()) n 'ZPB  
  { P=}l.R*1G  
   pSysMenu->AppendMenu(MF_SEPARATOR); [p4([ef '  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); rv{Wti[  
  } s {*rBX8N  
 } -n@,r%`UK  
 SetIcon(m_hIcon, TRUE); // Set big icon t,Tq3zB  
 SetIcon(m_hIcon, FALSE); // Set small icon =>S[Dh  
 m_Key.SetCurSel(0); v1$}[&/  
 RegisterHotkey();  \&d1bq  
 CMenu* pMenu=GetSystemMenu(FALSE); +sx(q@  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); &(< Gr0  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); #: EhGlq8  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); [Qr_0O  
 return TRUE; // return TRUE unless you set the focus to a control rE "FN~9P  
} $m)eO8S+  
qW3XA$g|j'  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) +^J&x>5  
{ `_DA!  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) \HD:#a  
 { Uv k:  
  CAboutDlg dlgAbout; "wVisL2+.  
  dlgAbout.DoModal(); )[99SM   
 } Z2;~{$&M+  
 else FS7D  
 { >uJu!+#  
  CDialog::OnSysCommand(nID, lParam); UJS vtD{g  
 } F`;q9<NYRW  
} W G3 _(mM  
f/ 3'lPK^  
void CCaptureDlg::OnPaint() .mnkV -m  
{ 2kgSIvk\  
 if (IsIconic()) -4Q\FLC'k  
 { fda2dY;  
  CPaintDC dc(this); // device context for painting Y;\@ 5TgQ,  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); a{e1g93}  
  // Center icon in client rectangle ZkibfVwe  
  int cxIcon = GetSystemMetrics(SM_CXICON); 1< b~="  
  int cyIcon = GetSystemMetrics(SM_CYICON); mJ8EiRSE  
  CRect rect; HII@Ed f?  
  GetClientRect(&rect); uEsF 8  
  int x = (rect.Width() - cxIcon + 1) / 2; 6Po {tKU  
  int y = (rect.Height() - cyIcon + 1) / 2; asW W@E  
  // Draw the icon {#t7lV'4  
  dc.DrawIcon(x, y, m_hIcon); t.!?"kP"c  
 } c*w0Jz>@.7  
 else Nn0j}ZI)1  
 { }V/iU_)  
  CDialog::OnPaint(); ~Y1nU-  
 } 6d5q<C_3t  
} iOAn/[^xk  
3?k<e  
HCURSOR CCaptureDlg::OnQueryDragIcon() zl, Vj%d  
{ vqF=kB"P  
 return (HCURSOR) m_hIcon; F.Bij8\  
} }L`Z<h*H  
D3tcwjXoW_  
void CCaptureDlg::OnCancel() Qp@}v7Due  
{ ^c}kVQ\g3  
 if(bTray) N+]HJ`K  
  DeleteIcon(); 6 {`J I  
  CDialog::OnCancel(); [$]-W$j+  
} D7IhNWrgj  
B_@p@6z  
void CCaptureDlg::OnAbout() \^cXmyQ<%  
{ !(S.7#-r  
 CAboutDlg dlg; xNJ*TA[+  
 dlg.DoModal(); Q*f0YjH!  
} Rto/-I0l  
xgsEe3|  
void CCaptureDlg::OnBrowse() OSJL,F,  
{ H ~<.2b  
 CString str; fn5!Nr ,  
 BROWSEINFO bi; SJ,];mC0  
 char name[MAX_PATH]; D;:p6q}hT  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); l?X)]1  
 bi.hwndOwner=GetSafeHwnd(); P#:nXc$  
 bi.pszDisplayName=name; 9*s:Vff{  
 bi.lpszTitle="Select folder"; Qdy/KL1]  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; F$s:\ N  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); OJFWmZ(X  
 if(idl==NULL) ND3|wQ`M0  
  return; r.]IGE|  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); U @}r?!)"f  
 str.ReleaseBuffer(); |41~U\  
 m_Path=str; @E> rqI;`  
 if(str.GetAt(str.GetLength()-1)!='\\') }?CKE<#%  
  m_Path+="\\"; M>*xbBl  
 UpdateData(FALSE); b-#oE{(\'  
} $}H,g}@0  
\Jwc[R&x  
void CCaptureDlg::SaveBmp() Co/04F.  
{ Lu71Qdu09  
 CDC dc; *y~~~ 'J/  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); e\ZV^h}TQ  
 CBitmap bm; gP!k[E ,Q8  
 int Width=GetSystemMetrics(SM_CXSCREEN); H:q;IYE+a  
 int Height=GetSystemMetrics(SM_CYSCREEN); 5p7i9"tgn  
 bm.CreateCompatibleBitmap(&dc,Width,Height); eV9,G8  
 CDC tdc; b-J6{=k^  
 tdc.CreateCompatibleDC(&dc); [t?:CgI)E  
 CBitmap*pOld=tdc.SelectObject(&bm); 9 H>J S  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Ih5CtcE1'd  
 tdc.SelectObject(pOld); /i"1e:cK  
 BITMAP btm; OP``+z>  
 bm.GetBitmap(&btm); WuQ;Da0+_F  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; |QyZ:`0u  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); h.xtkD)Y~  
 BITMAPINFOHEADER bih; cf\GC2+"^$  
 bih.biBitCount=btm.bmBitsPixel; - ^>7\]  
 bih.biClrImportant=0; _!yUr5&,Br  
 bih.biClrUsed=0; U_wIx  
 bih.biCompression=0; rwpH9\GE  
 bih.biHeight=btm.bmHeight; 7#P Q1UWl  
 bih.biPlanes=1; (ul_bA+  
 bih.biSize=sizeof(BITMAPINFOHEADER); %y+v0.aWH+  
 bih.biSizeImage=size; bc6|]kB:  
 bih.biWidth=btm.bmWidth; &'m&'wDt:  
 bih.biXPelsPerMeter=0; \XbCJJP  
 bih.biYPelsPerMeter=0; }?6gj%$c  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); m-9ChF: U  
 static int filecount=0; m>DJ w7<  
 CString name; SS&G<3Ke  
 name.Format("pict%04d.bmp",filecount++); @f#6Nu  
 name=m_Path+name; k4J Tc2b  
 BITMAPFILEHEADER bfh;  fTGVG  
 bfh.bfReserved1=bfh.bfReserved2=0; LP>GM=S#"  
 bfh.bfType=((WORD)('M'<< 8)|'B'); dp }zG+  
 bfh.bfSize=54+size; 7\i> >  
 bfh.bfOffBits=54; DNRWE1P2bg  
 CFile bf; o}L\b,])  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Vo(bro4ZQi  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 5QG?*Z~?7  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); i&L!?6 5-f  
  bf.WriteHuge(lpData,size); =pb ru=/  
  bf.Close(); xeRoif\4c  
  nCount++; SM.KM_%K  
 } L}t P_ *  
 GlobalFreePtr(lpData); I9sQPa  
 if(nCount==1) .bNG:y>  
  m_Number.Format("%d picture captured.",nCount); =GC,1WVEqV  
 else :f0#4'f  
  m_Number.Format("%d pictures captured.",nCount); cE*d(g  
  UpdateData(FALSE); 'Z6x\p  
} gAK"ShOhG=  
]&"01M~+K  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) fy>~ GFk(  
{ Yo}QW;,g  
 if(pMsg -> message == WM_KEYDOWN) CH0Nkf  
 { Aot9^@4])  
  if(pMsg -> wParam == VK_ESCAPE) nx5I  
   return TRUE; q]Af I(  
  if(pMsg -> wParam == VK_RETURN) D1wONss  
   return TRUE; 0>ce~KU  
 } -=2V4WU~  
 return CDialog::PreTranslateMessage(pMsg); -T>i5'2)  
} +DYsBCVbag  
8)YDUE%VH  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) E g_ram`\R  
{ iE^=Vf;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ $AdBX}{  
  SaveBmp(); =A_fL{ SM  
  return FALSE; +EH"A  
} [`!%u3  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ n"Wlfd0  
 CMenu pop; *~`BG5w  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); sc y_  
 CMenu*pMenu=pop.GetSubMenu(0); CWSc#E  
 pMenu->SetDefaultItem(ID_EXITICON); UYhxgPGsj  
 CPoint pt; 1P G"IaOb  
 GetCursorPos(&pt); SL`nt  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Lv<vMIr  
 if(id==ID_EXITICON) ,#j'~-5  
  DeleteIcon(); ^MvBW6#1  
 else if(id==ID_EXIT) D/Py?<n-B  
  OnCancel(); 2~%^ y6lR  
 return FALSE; *_K*GCy  
} ULzrJbP'7  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ,k}(]{ -  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) uP^u:'VjbH  
 AddIcon(); G|z%T`!U1;  
 return res; #@P0i^pFTB  
} f8)fm2^09  
BR:Mcc  
void CCaptureDlg::AddIcon() eaDG7+iS  
{ 8Y/1+-  
 NOTIFYICONDATA data; 0CK3jdZ+X  
 data.cbSize=sizeof(NOTIFYICONDATA); @iN"]GFjS  
 CString tip; $#E!/vVwD7  
 tip.LoadString(IDS_ICONTIP); N{uVh;_  
 data.hIcon=GetIcon(0); plM:7#eA  
 data.hWnd=GetSafeHwnd(); -[[( Zx  
 strcpy(data.szTip,tip); zxeT{AFPr?  
 data.uCallbackMessage=IDM_SHELL; -0P9|;h5  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 5 &0qr$  
 data.uID=98; . Gb!mG  
 Shell_NotifyIcon(NIM_ADD,&data); Y;k iU  
 ShowWindow(SW_HIDE); Yw_!40`  
 bTray=TRUE; ZWQ/BgKB  
} Hz>Dp !  
l_Zx'm  
void CCaptureDlg::DeleteIcon() a`>H69(bU  
{ Yh; A)N p  
 NOTIFYICONDATA data; KC nm_4  
 data.cbSize=sizeof(NOTIFYICONDATA); 6i@* L\ Dl  
 data.hWnd=GetSafeHwnd(); -s]@8VJA"  
 data.uID=98; M[(pLYq:  
 Shell_NotifyIcon(NIM_DELETE,&data); $CZ'[`+  
 ShowWindow(SW_SHOW); \r"gqv)^  
 SetForegroundWindow(); TQ=HFs ~  
 ShowWindow(SW_SHOWNORMAL); 0B: v0 R  
 bTray=FALSE; KtHkLYOCG  
} ~7m+N)5  
"Cs36k  
void CCaptureDlg::OnChange() -,2CMS#N  
{ .aR9ulS  
 RegisterHotkey(); z7TyS.z  
} q}W})  
)W&{OMr  
BOOL CCaptureDlg::RegisterHotkey() W:K '2j  
{ PlCj<b1D:  
 UpdateData(); gyuBmY  
 UCHAR mask=0; K|I<kA~!H  
 UCHAR key=0; |qBcE  
 if(m_bControl) JX{_,2*$  
  mask|=4; <>)N$$Rx&  
 if(m_bAlt) _PSOT5{  
  mask|=2; t(jE9t|2e6  
 if(m_bShift) }b/P\1#z  
  mask|=1; Nnq1&j"m  
  key=Key_Table[m_Key.GetCurSel()]; iUk#hLLC  
 if(bRegistered){ zE~Xx p  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); o7@C$R_#  
  bRegistered=FALSE; zjOOEvi  
 } n]i#&[*A(  
 cMask=mask; mi[8O$^iJ  
 cKey=key; !s:e  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); mhB2l/  
 return bRegistered; ij;P5OA  
} 8|zOgn{  
aemi;61T\  
  四、小结 opMnLor  
/aIGq/;Y+a  
  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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