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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: 'XfgBJF=  
  Fn,k!q  
  一、实现方法 ]xq::a{Oy  
ko[TDh$T5  
  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: cb+y9wA  
QaMDGD  
#pragma data_seg("shareddata") eOrYa3hQ  
HHOOK hHook =NULL; //钩子句柄 QP\yaPE  
UINT nHookCount =0; //挂接的程序数目 J~J@ ]5/  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 7Jx%JgF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 )*[ ""&  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey .)ST[G]WK  
static int KeyCount =0; O<`R~  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 F!CAitxd  
#pragma data_seg() qc0 B<,x7  
atnQC  
  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。 ('WY5Yps  
,+-?Zv 2  
  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: oeN zHp_  
aW`dFitpM  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR :o\5K2]:  
cKey,UCHAR cMask) B T7Id  
{ +Jw{qQR/*  
 BOOL bAdded=FALSE; WFh@%j  
 for(int index=0;index<MAX_KEY;index++){ aF])"9  
  if(hCallWnd[index]==0){ zUQe0Gc.b^  
   hCallWnd[index]=hWnd; AP@<r  
   HotKey[index]=cKey; _<u;4RO(s  
   HotKeyMask[index]=cMask; A9 n41,h  
   bAdded=TRUE; 4g!7 4a  
   KeyCount++; {bTeAfbf]  
   break; n#>5?W  
  } ;C_ >  
 } *aG"+c6|  
 return bAdded; G;2[  
} ?>)yKa#U  
//删除热键 /| f[us-w  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lM&UFEl-\  
{ ?waebuj>  
 BOOL bRemoved=FALSE; =, TSMV  
 for(int index=0;index<MAX_KEY;index++){ U?EG6t  
  if(hCallWnd[index]==hWnd){ bFn(w:1Q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ a>(~C'(<  
    hCallWnd[index]=NULL; Gt'/D>FE0  
    HotKey[index]=0; U9F6d!:L7A  
    HotKeyMask[index]=0; sS'{QIRC'  
    bRemoved=TRUE; ' fl(N2t  
    KeyCount--; RO$*G jQd  
    break; ]+lF=kkc %  
   } paYz[Xq  
  } ^?sSx!:bZ  
 } V g6S/-  
 return bRemoved; ]Da4.s*mW  
} +U=KXv  
dgY5ccP  
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  DLL中的钩子函数如下: s[Gswd  
}#|2z}!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) [k ~C+FI  
{ P,`=]Y*  
 BOOL bProcessed=FALSE; .)0gz!Z  
 if(HC_ACTION==nCode) e#m1X6$.e  
 { (-'PD_|  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ?Hk.|5A}  
   switch(wParam) D9G0k[D,  
   {  85 Dm8~  
    case VK_MENU: D{3fhPNU<b  
     MaskBits&=~ALTBIT; ebD{ pc`&  
     break; %\l0-RA@<  
    case VK_CONTROL: &&*wmnWCS{  
     MaskBits&=~CTRLBIT; [[$Mh_MD  
     break; Y)v%  
    case VK_SHIFT: Hq-v@@0 *  
     MaskBits&=~SHIFTBIT; i2U/RXu  
     break; hvL6zCi  
    default: //judge the key and send message `{WCrw6)  
     break; 1V\1]J/  
   } N&,"kRFFo  
   for(int index=0;index<MAX_KEY;index++){ {~"Em'}J  
    if(hCallWnd[index]==NULL) YiO3<}Uf  
     continue; U#$:\fT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tB !|p6  
    { gvK"*aIj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^:U;rHY  
     bProcessed=TRUE; %WmZ ]@M  
    } s1v{~xP  
   } Qv74?B@  
  } | 4%v"U  
  else if((lParam&0xc000ffff)==1){ //有键按下 >LCjtm\  
   switch(wParam) ]svw CPu C  
   { zM)M_L  
    case VK_MENU: 8vu2k>  
     MaskBits|=ALTBIT; vo.EM1x  
     break; hOV_Oqe4?  
    case VK_CONTROL: 1k`|[l^  
     MaskBits|=CTRLBIT; <%(f9j  
     break; 7%X+O8  
    case VK_SHIFT: fA;x{0CAMX  
     MaskBits|=SHIFTBIT; m9uUDq#GJ  
     break; 75PS^5T,  
    default: //judge the key and send message oX2r?.j#M  
     break; )y5iH){ !  
   } FmR\`yY_,  
   for(int index=0;index<MAX_KEY;index++){ a3*.,%d  
    if(hCallWnd[index]==NULL) _5Bu [I  
     continue; <)"iL4 kDI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )~G8 LZ  
    { NCp%sGBmG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); OfW%&LAMQ  
     bProcessed=TRUE; ~LSy7$rz  
    } YqkA&qL]#;  
   } ^75pV%<%  
  } .!9Vt#  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 "hz>{oe  
   for(int index=0;index<MAX_KEY;index++){ m2wp m_vV#  
    if(hCallWnd[index]==NULL) ;A`IYRzt  
     continue; (1OW6xtfG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) j`Tm\!q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #dL5x{gV=  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 uTxX`vH@!  
   } s-fKh`  
  } McO@p=M  
 } 9j9Y Q2  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 5X#i65_-  
} 7ucx6J]c  
g521Wdtnn  
  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: 1fmSk$ y.9  
T %$2k>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @^B S#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $HP/c Ku  
5^bh.uF  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 3KB| NS  
4,o %e,z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `e4o1 *  
{ ZE{aS4c  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) JvT %R`i  
 { N;e}dwh&  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 /vMQF+  
  SaveBmp(); eUi> Mp  
  return FALSE; PV5-^Y"v  
 } &II JKn|_  
 …… //其它处理及默认处理 j0Id!o  
} S5zpUF=  
CD*f4I#d  
tj`tLYOZ@-  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ]:[)KZ~  
))8Emk^Q{  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 )zo#1$C-  
h2im sjf  
  二、编程步骤 Vf@S8H  
mYzsT Uq  
  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"; 9;}L{yve  
"TEBByO'  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; W9:fKP  
$K5ni{M;  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; @2)t#~Wc4h  
i7Y s_8A"9  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; BXagSenc  
gK&5HTo  
  5、 添加代码,编译运行程序。 %g2/ o^c*  
J r=REa0  
三、程序代码 oHv{Y  
@2-Hj~  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL s|fCR  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 1jR=h7^=  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ S.zg&   
#if _MSC_VER > 1000 ,<R>Hiwg/s  
#pragma once ,AGM?&A  
#endif // _MSC_VER > 1000 hpd(d$j  
#ifndef __AFXWIN_H__ Fr938q6^-  
#error include 'stdafx.h' before including this file for PCH Uqb]e?@  
#endif g6x/f<2x  
#include "resource.h" // main symbols S,ouj;B  
class CHookApp : public CWinApp F(?Fz8  
{ [,.[gWA  
 public: Vu_7uSp,)  
  CHookApp(); My'9S2Y8nv  
  // Overrides ^K1~eb*K  
  // ClassWizard generated virtual function overrides `</=AY>  
  //{{AFX_VIRTUAL(CHookApp) C}dKbs^g|  
 public: _stI?fz*4k  
  virtual BOOL InitInstance(); G_4K+ -K  
  virtual int ExitInstance(); #"3[f@|e  
  //}}AFX_VIRTUAL T%;k%  
  //{{AFX_MSG(CHookApp) +xoyKP!  
  // NOTE - the ClassWizard will add and remove member functions here. A52LH,  
  // DO NOT EDIT what you see in these blocks of generated code ! c+)36/; X  
  //}}AFX_MSG kMfc"JXF  
  DECLARE_MESSAGE_MAP() dXf]G6  
}; OX#eLco  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); o(v"?Y6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &etL&s v  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); = !I8vQ>  
BOOL InitHotkey(); u&?yPR  
BOOL UnInit(); (r#5O9|S  
#endif llTQ\7zP  
r_!{!i3B  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. LLXg  
#include "stdafx.h" Zpn*XG  
#include "hook.h" Y&1!Z*OL;  
#include <windowsx.h> |IyM"UH  
#ifdef _DEBUG rw40<SS"Z  
#define new DEBUG_NEW v%69]a-T  
#undef THIS_FILE 9XJ9~I?  
static char THIS_FILE[] = __FILE__; .P |+oYT&g  
#endif ,u8ZS|9  
#define MAX_KEY 100 >S-N|uR6  
#define CTRLBIT 0x04 \S|VkPv  
#define ALTBIT 0x02 F1{?]>G  
#define SHIFTBIT 0x01 r-1yJ  
#pragma data_seg("shareddata") Kd AR)EU>  
HHOOK hHook =NULL; ^^t]vojX  
UINT nHookCount =0; 82^ z -t{  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey |)|vG_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ^6N3 nkyZ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey S+Y y  
static int KeyCount =0; &kr_CP:;  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift uJ) \P  
#pragma data_seg() [7SI<xkv  
HINSTANCE hins; ?-(w][MT\  
void VerifyWindow(); $h|I7`  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) P@! Q1pr  
//{{AFX_MSG_MAP(CHookApp) 4:%El+,_Y  
// NOTE - the ClassWizard will add and remove mapping macros here. i"r.>X'Z  
// DO NOT EDIT what you see in these blocks of generated code! k`iq<b  
//}}AFX_MSG_MAP 's7SZ$(  
END_MESSAGE_MAP() M rH%hRV6R  
qw Kh,[]  
CHookApp::CHookApp() //'xR8Z  
{ ATXx? b8h  
 // TODO: add construction code here, ?=|) n%  
 // Place all significant initialization in InitInstance 2S7H_qo$  
} m\}\RnZu  
K_<lO,[S  
CHookApp theApp; Bcd0   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Hm8EYPr J  
{ ;k63RNT,M&  
 BOOL bProcessed=FALSE; ] fwTi(4y  
 if(HC_ACTION==nCode) pO7{3%  
 { 4/mj"PBKL  
  if((lParam&0xc0000000)==0xc0000000){// Key up f4aD0.K.g|  
   switch(wParam) F_M~!]<na  
   { Xx9~  
    case VK_MENU: =E6i1x%j  
     MaskBits&=~ALTBIT; (`uC"MLk  
     break; c-3YSrY  
    case VK_CONTROL: -V<=`e  
     MaskBits&=~CTRLBIT; =vqE=:X6  
     break; Y+PvL|`O  
    case VK_SHIFT: ?Ss RN jeL  
     MaskBits&=~SHIFTBIT; S*DBY~pZy  
     break; x/jN& ;"/  
    default: //judge the key and send message Do[ F+Y  
     break; %8`1Li6g  
   } Sj]T{3mi  
   for(int index=0;index<MAX_KEY;index++){ MIua\:xT  
    if(hCallWnd[index]==NULL) R(7X}*@X  
     continue; !~$YD*" S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ik@Q@ T"  
    { Yf2+@E  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 7K5o" "  
     bProcessed=TRUE; =-1^K  
    } 5sV/N] !  
   } (>Q9jNW  
  } 6Kv}2M')+  
  else if((lParam&0xc000ffff)==1){ //Key down ?`[ uh%  
   switch(wParam) ~1wdAq`'a  
   { >FMT#x t  
    case VK_MENU: TF}4X;3Dsy  
     MaskBits|=ALTBIT; \ /X!tlwxh  
     break; '\E*W!R.]  
    case VK_CONTROL: NId~| &\  
     MaskBits|=CTRLBIT; mGyIr kE  
     break; 7gR;   
    case VK_SHIFT: `$x#_-Hn  
     MaskBits|=SHIFTBIT; o._#=7|(  
     break; qeO6}A"^|  
    default: //judge the key and send message %Cbc@=k  
     break; uK&wS#uY  
   } <K.C?M(9  
   for(int index=0;index<MAX_KEY;index++) ZZ.0'   
   { krnk%ug  
    if(hCallWnd[index]==NULL) L!}j3(I  
     continue; ?\p%Mx?   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /o06hy  
    { tU~H@'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2O)Kn q  
     bProcessed=TRUE; wGQhr="  
    } yfw>y=/p  
   } RT+30Q?  
  } hK9oe%kU~  
  if(!bProcessed){ >J75T1PH=  
   for(int index=0;index<MAX_KEY;index++){ yOCcp+`T}  
    if(hCallWnd[index]==NULL) pfn#~gC_=  
     continue; |9i/)LRXe  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) uRq#pYn@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Er+3S@sfq,  
   } H/la'f#o%  
  } O |I:[S},  
 } m&jt[   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #/sE{jm  
} 17[t_T&Ak9  
M0IqQM57N  
BOOL InitHotkey() X|n[9h:%  
{ kFZu/HRI  
 if(hHook!=NULL){ >zx50e)  
  nHookCount++; u.K'"-xt4K  
  return TRUE; h*X%:UbW  
 } . eag84_  
 else =`.5b:e  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); `q{'_\gVt(  
  if(hHook!=NULL) >D^7v(&  
   nHookCount++; d~f0]O  
  return (hHook!=NULL); 9qO:K79|  
} BMsy}08dQ  
BOOL UnInit() YHv,Z|.w  
{ MVU'GHv  
 if(nHookCount>1){ U!UX"r  
  nHookCount--; qx CL  
  return TRUE; 2dJ)4  
 } .1q~,}toX  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 3/|{>7]1  
 if(unhooked==TRUE){ % |Gzht\  
  nHookCount=0; &l}xBQAL  
  hHook=NULL; T7Qd I[K%b  
 } X%\6V;zR#  
 return unhooked; N*)8L[7_;  
} \]:NOmI^'  
ghd[G}  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) j tkPi)QR  
{ K.L+; nQ  
 BOOL bAdded=FALSE; f%%En5e +  
 for(int index=0;index<MAX_KEY;index++){ Q_h+r! b  
  if(hCallWnd[index]==0){ ( =/L#Yg_  
   hCallWnd[index]=hWnd; f7AJSHe  
   HotKey[index]=cKey; yW,#&>]# |  
   HotKeyMask[index]=cMask; z8[|LF-dx  
   bAdded=TRUE; +q?0A^C>  
   KeyCount++; P##(V!YR  
   break; u2m{Yx|  
  } w I 7  
 } ,7nb;$]  
 return bAdded; <+JFal  
} 0J,d9a [1  
 G/;aZ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) zgOwSg8  
{ b0CaoSWo  
 BOOL bRemoved=FALSE; M@ZpgAfq  
 for(int index=0;index<MAX_KEY;index++){ <T~fh>a  
  if(hCallWnd[index]==hWnd){ RpXGgw  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &XTd[_VW!  
    hCallWnd[index]=NULL; 8}b[Q/h!  
    HotKey[index]=0; ~=]@], {  
    HotKeyMask[index]=0; k  5kX  
    bRemoved=TRUE; iYs?B0*JWK  
    KeyCount--; :hdh$}y  
    break; 3T^dgWXEG  
   } >N"PLSY1  
  } MBrVh6z>  
 } pY5HW2TsY|  
 return bRemoved; @uD{`@[  
} $>37PVVW  
!/9Sb1_~  
void VerifyWindow() EF{'J8AQ  
{ <g1hdF0  
 for(int i=0;i<MAX_KEY;i++){ yFtf~8s3  
  if(hCallWnd!=NULL){ T:5%sN;#O  
   if(!IsWindow(hCallWnd)){ siZ_JJW  
    hCallWnd=NULL; L. ?dI82c  
    HotKey=0; gx R|S  
    HotKeyMask=0; W 9MZ  
    KeyCount--; gxtbu$  
   } tdK^X1  
  } AsF`A"Cdw<  
 } 2G> ]W?>  
} xJ5!` #=  
k(Xv&Zn  
BOOL CHookApp::InitInstance() 4^9_E &Fa  
{ QRa6*AYm  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); AQU: 0  
 hins=AfxGetInstanceHandle(); "lb!m9F{  
 InitHotkey(); P&,cCR>  
 return CWinApp::InitInstance(); V!tBipX%  
} zg Ti Az  
qnV9TeU)  
int CHookApp::ExitInstance() N2Hb19/k  
{ o fv 1G=P  
 VerifyWindow(); %+J*oFwQu  
 UnInit(); S*@0%|Q4r  
 return CWinApp::ExitInstance(); .Sw'Bo!Ee  
} =xP{f<`   
.Q@'Ob`  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file V2skr_1  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) [)c|oh%  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 84cH|j`w  
#if _MSC_VER > 1000 4u7>NQUDu  
#pragma once nL~ b   
#endif // _MSC_VER > 1000 m(]IxI  
Ka2tr]+s  
class CCaptureDlg : public CDialog SXF_)1QO\W  
{ !}48;Pl  
 // Construction /a)=B)NH  
 public: Xh!Pg)|E  
  BOOL bTray; GQWTQIl]  
  BOOL bRegistered; d'D\#+%> =  
  BOOL RegisterHotkey(); ?"u-@E[m  
  UCHAR cKey; Ux]@p rAq  
  UCHAR cMask; 1yc@q8  
  void DeleteIcon(); E.9k%%X]  
  void AddIcon(); |/Z)?  
  UINT nCount; p8J"%Jq}  
  void SaveBmp(); 8"^TWzg}L  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor c17==S  
  // Dialog Data w+P^c|  
  //{{AFX_DATA(CCaptureDlg) yBKlp08J  
  enum { IDD = IDD_CAPTURE_DIALOG }; `vBa.)u  
  CComboBox m_Key; i|'t!3I^m  
  BOOL m_bControl; Wb xksh:)Q  
  BOOL m_bAlt; ``Rb-.Fq,  
  BOOL m_bShift; y$NG..S  
  CString m_Path; _.LWc^Sg  
  CString m_Number; x*)O<K  
  //}}AFX_DATA @U5>w\  
  // ClassWizard generated virtual function overrides Dw,f~D$+ic  
  //{{AFX_VIRTUAL(CCaptureDlg) k JFHUR  
 public: E+ 20->  
  virtual BOOL PreTranslateMessage(MSG* pMsg); rNp#5[e  
 protected: Xpwom'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support MqH~L?~}|  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2 wvDC@  
  //}}AFX_VIRTUAL eQj/)@B:V  
  // Implementation F tjm@:X  
 protected: j]SkBZgik  
  HICON m_hIcon; ?yK\L-ad  
  // Generated message map functions ]aL}&GlHt  
  //{{AFX_MSG(CCaptureDlg) $vz%   
  virtual BOOL OnInitDialog(); ^Yz05\  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); :"]ei@  
  afx_msg void OnPaint(); =<xbE;,0  
  afx_msg HCURSOR OnQueryDragIcon(); k =_@1b-  
  virtual void OnCancel(); W -&5 v  
  afx_msg void OnAbout(); _Oq\YQb v  
  afx_msg void OnBrowse(); Df^S77&c!  
  afx_msg void OnChange(); P#PQ4uK \  
 //}}AFX_MSG ?Pc 3*.  
 DECLARE_MESSAGE_MAP() p7er04/}\  
}; BZ9iy~  
#endif "dTXT  
~yN,FpD  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file yjzNU5F  
#include "stdafx.h" O!tD1^O!1}  
#include "Capture.h" :_ox8xS4  
#include "CaptureDlg.h" ls Ch K  
#include <windowsx.h> gZv <_0N  
#pragma comment(lib,"hook.lib") Hc9pWr "N  
#ifdef _DEBUG EVsZ:Ra^k  
#define new DEBUG_NEW t;3.;  
#undef THIS_FILE Y[4B{  
static char THIS_FILE[] = __FILE__; ow "Xv  
#endif ;0'v`ob'.?  
#define IDM_SHELL WM_USER+1 Z ngJ9js  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !)34tu2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ZbUf|#GTB  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; p6'8l~W+  
class CAboutDlg : public CDialog v'tk: Hm1  
{ *2F }e4v  
 public: zdE^v{}|  
  CAboutDlg(); =d}3>YHS  
  // Dialog Data v!Z9T  
  //{{AFX_DATA(CAboutDlg) CgC wM=!r  
  enum { IDD = IDD_ABOUTBOX }; 4aC#Cv:0  
  //}}AFX_DATA ZD(gYNi  
  // ClassWizard generated virtual function overrides U,BB C  
  //{{AFX_VIRTUAL(CAboutDlg) 6* 7&X#gG  
 protected: _L":Wux  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -yeT$P&|  
  //}}AFX_VIRTUAL 5FxU=M1gF  
  // Implementation >.|gmo>b  
 protected: LNkyV*TI  
  //{{AFX_MSG(CAboutDlg) 3 6 ;hg #  
  //}}AFX_MSG "f_Z.6WMY  
  DECLARE_MESSAGE_MAP() a 2TC,   
}; }|,y`ui\  
cht#~d  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ZtVa*xl  
{ O [/~V=  
 //{{AFX_DATA_INIT(CAboutDlg) gZ3!2T>  
 //}}AFX_DATA_INIT <=Qk^Y2k  
} %L3]l  
Pp2 )P7  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) N;Bal/kd2  
{ eAMT72_  
 CDialog::DoDataExchange(pDX); zKNk(/y  
 //{{AFX_DATA_MAP(CAboutDlg) `Nj|}^A  
 //}}AFX_DATA_MAP Bh?;\D'YC  
} KXJHb{?  
k&b>-QP6  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ~ 4a aJ0  
 //{{AFX_MSG_MAP(CAboutDlg) Lg1Usy%  
 // No message handlers ,tZwXP{  
 //}}AFX_MSG_MAP )c/] 8KU  
END_MESSAGE_MAP() 4"sP= C  
c'b,=SM  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~"k'T9QBY  
: CDialog(CCaptureDlg::IDD, pParent) D6w0Y:A{.  
{ 7nmo p7  
 //{{AFX_DATA_INIT(CCaptureDlg) ry'(m M  
  m_bControl = FALSE; Lmb<)YY  
  m_bAlt = FALSE; \IKr+wlN8  
  m_bShift = FALSE; ]NCOi ?Odx  
  m_Path = _T("c:\\"); F~1R.r_Lu  
  m_Number = _T("0 picture captured."); scdT/|(U$  
  nCount=0; E _K7.c4M  
  bRegistered=FALSE; :R)IaJ6)  
  bTray=FALSE; DI_mF#5q  
 //}}AFX_DATA_INIT amRtFrc|  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 W4<}w-AoEp  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *q RQN+%  
} 'g#GUSXfj  
{% P;O ?  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) <  -Nj  
{ l _:%?4MA  
 CDialog::DoDataExchange(pDX); )7^jq|  
 //{{AFX_DATA_MAP(CCaptureDlg) &kG<LGXP#  
  DDX_Control(pDX, IDC_KEY, m_Key); -Q; w4@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); {-xnBx  
  DDX_Check(pDX, IDC_ALT, m_bAlt); U^xFqJY6  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); L$g;^@j  
  DDX_Text(pDX, IDC_PATH, m_Path); pfT7  
  DDX_Text(pDX, IDC_NUMBER, m_Number); (I$hw"%&  
 //}}AFX_DATA_MAP AF@C9s  
} _PIk,!<  
d1-QkW^0y  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) b}fH$.V@  
//{{AFX_MSG_MAP(CCaptureDlg) 5M*p1^ >  
 ON_WM_SYSCOMMAND() =F9-,"EAI  
 ON_WM_PAINT() x-1[2K1"[  
 ON_WM_QUERYDRAGICON() <x/&Ml+  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ,f$ RE6  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) WCH>9Z>cj  
 ON_BN_CLICKED(ID_CHANGE, OnChange) >9 iv>  
//}}AFX_MSG_MAP KvQ9R!V  
END_MESSAGE_MAP() du !.j  
7% h Mf$KQ  
BOOL CCaptureDlg::OnInitDialog() sdb#K?l  
{ 7$'ja  
 CDialog::OnInitDialog(); /vu7;xVG  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); x RfX:3  
 ASSERT(IDM_ABOUTBOX < 0xF000); PF.HYtZqK  
 CMenu* pSysMenu = GetSystemMenu(FALSE); "ggq7cJ}_  
 if (pSysMenu != NULL) V|7 c dX#H  
 { yxH[uJpb  
  CString strAboutMenu; (f)QEho7  
  strAboutMenu.LoadString(IDS_ABOUTBOX); FEkx&9]  
  if (!strAboutMenu.IsEmpty()) s[hD9$VB>  
  { W/ERqVZR]  
   pSysMenu->AppendMenu(MF_SEPARATOR); R$q:Ct  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); m*1=-" P  
  } R&?p^!`%  
 } C<3An_Dy  
 SetIcon(m_hIcon, TRUE); // Set big icon ' {Q L`L  
 SetIcon(m_hIcon, FALSE); // Set small icon ^#nAS2w7U  
 m_Key.SetCurSel(0); j'Fni4;  
 RegisterHotkey(); ^dro*a,  
 CMenu* pMenu=GetSystemMenu(FALSE); `!i>fo~  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); <*L8kNykK  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); =_5-z|<  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); [Mx+t3M  
 return TRUE; // return TRUE unless you set the focus to a control O?@AnkOhn  
} s^cHR1^  
[8ih-k  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) o.,hCg)X  
{ 8O]$)E  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) |q?A8@\u  
 { c5JxKU_  
  CAboutDlg dlgAbout; > B==*,|  
  dlgAbout.DoModal(); dwRJ0D]&  
 } 37VSE@Z+  
 else .k}h'nE  
 { )/UkJ/}j  
  CDialog::OnSysCommand(nID, lParam); Qk((H~I}  
 } d;`JDT  
} dI`b AP;\  
y@F{pr+dA  
void CCaptureDlg::OnPaint() hUqIjcuL4  
{ 5( 3tPbm{  
 if (IsIconic()) GE|V^_|i  
 { vV%w#ULxE~  
  CPaintDC dc(this); // device context for painting G3q\Z`|3h  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); u BvN*LQ  
  // Center icon in client rectangle =oBV.BST u  
  int cxIcon = GetSystemMetrics(SM_CXICON); E;yP.<PW  
  int cyIcon = GetSystemMetrics(SM_CYICON); ig6F!p  
  CRect rect; bYiaJ  
  GetClientRect(&rect); YQ]W<0(  
  int x = (rect.Width() - cxIcon + 1) / 2; env]*gx+=  
  int y = (rect.Height() - cyIcon + 1) / 2; jVr:O `  
  // Draw the icon -LUKYGBK  
  dc.DrawIcon(x, y, m_hIcon); /)j:Y:5  
 } {a(TT)d  
 else $. Ih-  
 { {<V{0 s%  
  CDialog::OnPaint(); U<zOR=_  
 } PAJt M  
} rAgb<D@,H  
0y*8;7-|r)  
HCURSOR CCaptureDlg::OnQueryDragIcon() yTv#T(of  
{ L:7%Wdyh  
 return (HCURSOR) m_hIcon; 3{CXIS  
} p~qdkA<  
MFRM M%`  
void CCaptureDlg::OnCancel() H8X{!/,^  
{ WOh?/F[@u  
 if(bTray) L^dF )y?  
  DeleteIcon(); Y-v6xUc{F  
  CDialog::OnCancel(); (m13 ong  
} `j9 ;9^  
D KR2b`J  
void CCaptureDlg::OnAbout() Y f1?3 (0O  
{ >o.4sN@  
 CAboutDlg dlg; 5LR k)@t  
 dlg.DoModal(); W2'u]1bs  
} 05Ak[OOU>  
S3$&}I <  
void CCaptureDlg::OnBrowse() BKi@c\Wb  
{ eot%T h?[  
 CString str; `@RTfBB g  
 BROWSEINFO bi;  _->d41  
 char name[MAX_PATH]; a0~LZQ?  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); .r 4 *?>  
 bi.hwndOwner=GetSafeHwnd(); N:_.z~>%  
 bi.pszDisplayName=name; F P3{Rp  
 bi.lpszTitle="Select folder"; *|Tx4Qt  
 bi.ulFlags=BIF_RETURNONLYFSDIRS;  Vmt$]/  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); EN^5 Hppb  
 if(idl==NULL) JD9)Qelw^$  
  return; @cukoLAn  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ]V^ >aUlj  
 str.ReleaseBuffer(); HQX.oW  
 m_Path=str;  Z/RSZ-  
 if(str.GetAt(str.GetLength()-1)!='\\') s^#B*  
  m_Path+="\\"; #ozui-u>  
 UpdateData(FALSE); n&1q*  
} NYw>Z>TD8c  
:<hM@>eFn  
void CCaptureDlg::SaveBmp() ^M0  
{ ]jjHIFX  
 CDC dc; f3^Anaa]l  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Zjd9@  
 CBitmap bm; ?k@^U9?R  
 int Width=GetSystemMetrics(SM_CXSCREEN); Ir#]p9:x  
 int Height=GetSystemMetrics(SM_CYSCREEN); tnE),  
 bm.CreateCompatibleBitmap(&dc,Width,Height); FF#T"y0Y  
 CDC tdc; k'QI`@l&l  
 tdc.CreateCompatibleDC(&dc); @q]4]U)  
 CBitmap*pOld=tdc.SelectObject(&bm); 6+!$x?5|NP  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); -!q^/ux  
 tdc.SelectObject(pOld); TXdo,DPv7  
 BITMAP btm; {.eo?dQ  
 bm.GetBitmap(&btm); *O_>3Hgl  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; >jz9o9?8  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); *+(rQ";x  
 BITMAPINFOHEADER bih; %tB7 &%ut  
 bih.biBitCount=btm.bmBitsPixel; 2ca#@??R  
 bih.biClrImportant=0; `3g5n:"g\  
 bih.biClrUsed=0; 8wV`mdKN  
 bih.biCompression=0; FRa>cf4  
 bih.biHeight=btm.bmHeight; B`|f"+.  
 bih.biPlanes=1; |P@N}P@  
 bih.biSize=sizeof(BITMAPINFOHEADER); ,R. rxoO  
 bih.biSizeImage=size; gu|=uW K  
 bih.biWidth=btm.bmWidth; Wn2'uZ5If  
 bih.biXPelsPerMeter=0; ox*1F+Xri  
 bih.biYPelsPerMeter=0; .J <t]  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 0CO@@`~4  
 static int filecount=0; 9HB+4q[  
 CString name; `J] e.K  
 name.Format("pict%04d.bmp",filecount++); u8.F_'`z  
 name=m_Path+name; _AzI\8m  
 BITMAPFILEHEADER bfh; .do8\  
 bfh.bfReserved1=bfh.bfReserved2=0; (\ge7sE-oo  
 bfh.bfType=((WORD)('M'<< 8)|'B'); t0,=U8]w  
 bfh.bfSize=54+size; AXF 1{  
 bfh.bfOffBits=54; /%g+|C  
 CFile bf; bmu]zJ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ _o[fjd  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); pT{is.RM  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); LTxP@pr  
  bf.WriteHuge(lpData,size); ^hXm=r4ozR  
  bf.Close(); KRz~3yH{ c  
  nCount++; }y Vx"e)  
 } :_}xN!9LA  
 GlobalFreePtr(lpData); kDol1v`  
 if(nCount==1) d a<>a  
  m_Number.Format("%d picture captured.",nCount); (n`] sbx  
 else )(0if0D4  
  m_Number.Format("%d pictures captured.",nCount); z%S$~^=b  
  UpdateData(FALSE); @R%* ;)*F  
} ? X6M8`  
fLnwA|n=  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) O}>@G  
{ /poGhB 1k  
 if(pMsg -> message == WM_KEYDOWN) |.VSw  
 { ^s6}[LDW>@  
  if(pMsg -> wParam == VK_ESCAPE) Y?TS,   
   return TRUE; @Ddz|4vEi  
  if(pMsg -> wParam == VK_RETURN) "4\k1H"_  
   return TRUE; ^D<CoxG  
 } L&c & <+0T  
 return CDialog::PreTranslateMessage(pMsg); tL3R<'  
} E*O($tS  
3_<l`6^Ns/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ,`JYFh M  
{ sC.b '1P  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Q7rBc wm5  
  SaveBmp(); (?m{G Q  
  return FALSE; 2TU V9Z  
} & XmaGtt  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ O 2-n-  
 CMenu pop; 6#7hMQ0&;O  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); H1f='k]SZ  
 CMenu*pMenu=pop.GetSubMenu(0); ,VS(4  
 pMenu->SetDefaultItem(ID_EXITICON); )7 q"l3e"u  
 CPoint pt; FY^2 Y  
 GetCursorPos(&pt); Q66 +  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); c ef[T(>  
 if(id==ID_EXITICON) tPl 4'tW_  
  DeleteIcon(); w]t'2p-'  
 else if(id==ID_EXIT) pJx7S sW  
  OnCancel(); g3].STz6w  
 return FALSE; OKAU*}_  
} 9j|v D  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +@=V}IO  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) K(i}?9WD  
 AddIcon();  tPQ|znB|  
 return res; r[4n2Mys  
} kV+^1@"  
dpTsTU!\  
void CCaptureDlg::AddIcon() =B9-}]DDO  
{ 5]>*0#C S  
 NOTIFYICONDATA data; n1J u =C  
 data.cbSize=sizeof(NOTIFYICONDATA); RI@\cJ\}  
 CString tip; `0\Z*^>  
 tip.LoadString(IDS_ICONTIP); PFuhvw~?  
 data.hIcon=GetIcon(0); nm@ h5ON_  
 data.hWnd=GetSafeHwnd(); z3y{0<3  
 strcpy(data.szTip,tip); (B>/LsTu  
 data.uCallbackMessage=IDM_SHELL; >*RU:X  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Hl`OT5 pNf  
 data.uID=98; `*Yw-HL  
 Shell_NotifyIcon(NIM_ADD,&data); UB.1xcI  
 ShowWindow(SW_HIDE); UxL*I[z5  
 bTray=TRUE; 5X20/+aT  
} :ZM9lBYh  
uX*2Rs$s  
void CCaptureDlg::DeleteIcon() 4~,Z 'k  
{ d #1Y^3n  
 NOTIFYICONDATA data; H"FK(N\  
 data.cbSize=sizeof(NOTIFYICONDATA); *{3d+j/?/  
 data.hWnd=GetSafeHwnd(); lG)wa  
 data.uID=98; \P*_zd@%  
 Shell_NotifyIcon(NIM_DELETE,&data); l)9IgJ|<b  
 ShowWindow(SW_SHOW); 2 ^m}5:0  
 SetForegroundWindow(); 6@s!J8!  
 ShowWindow(SW_SHOWNORMAL); f^FFn32u  
 bTray=FALSE; 7pm'b,J<  
} r }lGcG)  
N[p o)}hp  
void CCaptureDlg::OnChange() k5I;Y:~`  
{ [3jJQ3O,  
 RegisterHotkey(); F{0\a;U@^  
} !l9{R8m>eJ  
BB6[(Z  
BOOL CCaptureDlg::RegisterHotkey() ^O18\a  
{ I.n,TJoz4J  
 UpdateData(); xvV";o  
 UCHAR mask=0; BM<q;;pO  
 UCHAR key=0; 9B!Sv/)y!r  
 if(m_bControl) mux/\TII  
  mask|=4; Kcm+%p^  
 if(m_bAlt) 6nZ]y&$G-k  
  mask|=2; Ipk;Nq  
 if(m_bShift) 0G+Q^]0  
  mask|=1; nF@**,C Q  
  key=Key_Table[m_Key.GetCurSel()]; @|\9<S  
 if(bRegistered){ R9U{r.AA  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); #7i*Diqf9  
  bRegistered=FALSE; )i~AXBt}  
 } iApq!u,  
 cMask=mask; & Q3Fgj  
 cKey=key; lI<jYd 0fZ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); GGp.u@\r  
 return bRegistered; uzBQK  
} sp,-JZD  
oX|T&"&  
  四、小结 e9o\qEm   
<y@v v  
  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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