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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: }7%ol&<@  
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  一、实现方法 $y<`Jy]+)~  
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  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: v7+|G'8M`  
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#pragma data_seg("shareddata") S._h->5f  
HHOOK hHook =NULL; //钩子句柄 HF&d HD2f  
UINT nHookCount =0; //挂接的程序数目 i)'u!V  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 TFbF^Kd#:d  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 C]zgVbu  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey uuUj IZCtz  
static int KeyCount =0; 7 oYD;li$k  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 kd p*6ynD  
#pragma data_seg() (/> yfL]J  
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  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。 RHu,t5,  
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  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: 'r^'wv]  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR JO87rG  
cKey,UCHAR cMask) s.Mrd~(Drz  
{ ]YD qmIW  
 BOOL bAdded=FALSE; "tK3h3/Xv  
 for(int index=0;index<MAX_KEY;index++){ La^Zr,T!  
  if(hCallWnd[index]==0){ N0 t26| A  
   hCallWnd[index]=hWnd; (hY^E(D  
   HotKey[index]=cKey; Jju?v2y`  
   HotKeyMask[index]=cMask; SN QLEe  
   bAdded=TRUE; l29AC}^  
   KeyCount++; HqOnZ>D  
   break; Oh}@c~7;  
  } el^<M,7!  
 } t!ZFpMv]n  
 return bAdded; q<fj1t1w  
} dt>!=<|k  
//删除热键 Z%-uyT@a  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6|Rj YX  
{ w' 5W L  
 BOOL bRemoved=FALSE; @:9mTP7  
 for(int index=0;index<MAX_KEY;index++){ gr>FLf   
  if(hCallWnd[index]==hWnd){ Xn<|6u  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ D{t0OvQag  
    hCallWnd[index]=NULL; h!hv{c  
    HotKey[index]=0; .R^]<b:`  
    HotKeyMask[index]=0; $- Z/UHT  
    bRemoved=TRUE; 38JU-aq  
    KeyCount--; i079 V  
    break;  q,'~=Y5  
   } SYOU &*  
  } 8wS9%+  
 } mvtuV`  
 return bRemoved; } 4>#s$.2  
} URTJA<r8D  
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  DLL中的钩子函数如下: ! }awlv;  
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LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) dp1t]  
{ W?@+LQa??  
 BOOL bProcessed=FALSE; wK%x|%R[  
 if(HC_ACTION==nCode) /z(s1G.  
 { 9+>%U~U<  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 qkyYt#4E  
   switch(wParam) u-dF ~.x  
   {  7aN oqS+  
    case VK_MENU: %A( hmC  
     MaskBits&=~ALTBIT; ]<O -  
     break; D <Fl7QAb  
    case VK_CONTROL: o\y qf:V8  
     MaskBits&=~CTRLBIT; 'V Y\ut  
     break; )4/UzR$  
    case VK_SHIFT: A`b )7+mB  
     MaskBits&=~SHIFTBIT; }% ?WS  
     break; vf_pEkx*wD  
    default: //judge the key and send message @] {:juD~  
     break; tbi(e49S  
   } gem+$TFq  
   for(int index=0;index<MAX_KEY;index++){ n<sA?T  
    if(hCallWnd[index]==NULL) 6HR*)*>z_  
     continue; ]h&?^L<.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z:W1(/W~  
    { ~leLQsZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;W#/;C _h  
     bProcessed=TRUE; '#8;bU  
    } 7)3cq}]O  
   } c6pGy%T-  
  } S4X['0rX!  
  else if((lParam&0xc000ffff)==1){ //有键按下 E{|n\|  
   switch(wParam) +Sdki::  
   { ^TY8,qDA  
    case VK_MENU: 51M'x_8  
     MaskBits|=ALTBIT; rxIYgh  
     break; l' Z `%}R  
    case VK_CONTROL: N_8L8ds5  
     MaskBits|=CTRLBIT; [$GQ]Y  
     break; 2$QuR~  
    case VK_SHIFT: s}Sxl0  
     MaskBits|=SHIFTBIT; x1*@PiO,.  
     break; Z{.L_ ]$ I  
    default: //judge the key and send message \U'TL_Ql  
     break; 5'O.l$)y  
   } u&Dd9kMz  
   for(int index=0;index<MAX_KEY;index++){ iJK rNRj  
    if(hCallWnd[index]==NULL) WN?meZ/N/  
     continue; ?{6[6T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  SjO Iln  
    { @-qC".CI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ()i!Uo  
     bProcessed=TRUE; QJ-?6 7_i  
    } ! J@pox-t  
   } Z})n%l8J]p  
  } \\~4$Ai[  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 t]%! vXo  
   for(int index=0;index<MAX_KEY;index++){ -Qco4>Z8  
    if(hCallWnd[index]==NULL) |k9A*7I  
     continue; s97L/iH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ? &;d)TQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ed)!Snz   
     //lParam的意义可看MSDN中WM_KEYDOWN部分 N[,/VCW  
   } _.Bite^  
  } ) N"gW*  
 } >'zp  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %4E7 Tu,1  
} V/-~L]G  
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  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: D+  **o  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ETVT.R8   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !bCLi>8  
&9'JHF!l  
  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: 5{|\h}  
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LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) aw:0R=S,>  
{ {*C LWs4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) p^``hP:J  
 { .el_pg  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Rx=pk  
  SaveBmp(); MXhRnVz"W  
  return FALSE; B1Iq:5nmoS  
 } {N,w5!cP  
 …… //其它处理及默认处理 way-Q7  
} X_eV<]zA+  
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Zb#  
  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。 \:?H_^^ d  
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  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。 .*g;2.-qv&  
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  二、编程步骤 ;3_Q7;y  
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  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"; G:rM_q9\u  
6l$o^R^D  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; P5P<-T{-c  
n1W}h@>8  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Swua dN  
;"nEEe]?  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 6%_d m'  
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  5、 添加代码,编译运行程序。 Ja#idF[V  
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三、程序代码 qQ6NxhQo  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL HF\L`dJX?  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) \ca4X{x  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ E%-&!%_>D@  
#if _MSC_VER > 1000 i9)y|  
#pragma once <s#}`R.#2  
#endif // _MSC_VER > 1000 ;@ d<*  
#ifndef __AFXWIN_H__ q+o(`N'~G  
#error include 'stdafx.h' before including this file for PCH MU&5&)m  
#endif "v3u$-xN1  
#include "resource.h" // main symbols +o/;bm*U<K  
class CHookApp : public CWinApp O'-lBf+<  
{ Aq|LeH  
 public: <STjB,_s  
  CHookApp(); ]yVB66l  
  // Overrides XW Y0WDh:  
  // ClassWizard generated virtual function overrides ^J~}KOH  
  //{{AFX_VIRTUAL(CHookApp) .[Sv|;x"E  
 public: *<#&ne 8  
  virtual BOOL InitInstance(); )-a_,3x%j  
  virtual int ExitInstance(); C>;yW7*g"  
  //}}AFX_VIRTUAL >8tE`2[i*  
  //{{AFX_MSG(CHookApp) &:jE+l  
  // NOTE - the ClassWizard will add and remove member functions here. nw5#/5xw  
  // DO NOT EDIT what you see in these blocks of generated code ! t7A.b~#  
  //}}AFX_MSG I"JT3[*s  
  DECLARE_MESSAGE_MAP() ESASsRzk  
}; w-CuO4P  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ,_lwT}*w  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1=(i{D~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |$b4 {  
BOOL InitHotkey(); C.(ZXU7  
BOOL UnInit(); `?6m0|\@  
#endif L6A6|+H%E  
?I/,r2ODLh  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ;. :UfW  
#include "stdafx.h" @,aL'2G  
#include "hook.h" 9 [I ro  
#include <windowsx.h> #t(?8!F  
#ifdef _DEBUG a* IJ)'S  
#define new DEBUG_NEW "a"[B'  
#undef THIS_FILE KuI>:i;  
static char THIS_FILE[] = __FILE__; yMSRUQ x  
#endif dF.T6b  
#define MAX_KEY 100 eNNgxQw>m  
#define CTRLBIT 0x04 0`ib_&yI  
#define ALTBIT 0x02 X}usyO'pW  
#define SHIFTBIT 0x01 7_Q86o  
#pragma data_seg("shareddata") xZhD6'Zzz  
HHOOK hHook =NULL; v}Aw!Dv/  
UINT nHookCount =0; G+g`=7  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Ixec]UOS  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT #uXOyiE  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey X7 Za Q .  
static int KeyCount =0; _RmE+Xg2  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift [X~X?By>  
#pragma data_seg() 7e=a D~f  
HINSTANCE hins; \qTn"1b Q  
void VerifyWindow(); YHRI UY d  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) &'](T9kg=  
//{{AFX_MSG_MAP(CHookApp) R&alq  
// NOTE - the ClassWizard will add and remove mapping macros here. 4*9Dh  
// DO NOT EDIT what you see in these blocks of generated code! F#<P FT4i  
//}}AFX_MSG_MAP .$OInh  
END_MESSAGE_MAP() 1)PR]s:-m@  
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CHookApp::CHookApp() bA^a@ lv a  
{ z vYDE]  
 // TODO: add construction code here, n `Xz<Q!  
 // Place all significant initialization in InitInstance 2E1TJ.[BS  
} =91'.c<  
|(H|2]b4 =  
CHookApp theApp; S2s-TpjB<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) &S-& 'ZAY  
{ 0,A?*CO  
 BOOL bProcessed=FALSE; O#U"c5%  
 if(HC_ACTION==nCode) ) k2NF="o  
 { JZnWzqFw  
  if((lParam&0xc0000000)==0xc0000000){// Key up 0Its;|  
   switch(wParam) mcXakWmi  
   { 'OihA^e  
    case VK_MENU: V_1#7  
     MaskBits&=~ALTBIT; RtW5U8  
     break; .>nd@oU  
    case VK_CONTROL: 'q^Gg;c>+  
     MaskBits&=~CTRLBIT; D8#q.OR]  
     break; &Egn`QU  
    case VK_SHIFT: %7@H7^s}9  
     MaskBits&=~SHIFTBIT; m{5$4v,[  
     break; RQ'c~D)X  
    default: //judge the key and send message dB,#`tc=,  
     break; w:LCm `d  
   } 4>Y\2O?**  
   for(int index=0;index<MAX_KEY;index++){ (hV"z;rI  
    if(hCallWnd[index]==NULL) %i "  
     continue; *Fc&DQT(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;' W5|.ZN  
    { +UsR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,TtDCcjd%f  
     bProcessed=TRUE; w +Z};C  
    } :y %~9=  
   } e ^qnUjMy  
  } m pivg  
  else if((lParam&0xc000ffff)==1){ //Key down &zd7t6  
   switch(wParam) Ww@;9US 3  
   { $"(YE #]|  
    case VK_MENU: -U $pW(~  
     MaskBits|=ALTBIT; S- \lN|  
     break; 8JrGZ8Q4RM  
    case VK_CONTROL: >y~_Hh(TSL  
     MaskBits|=CTRLBIT; E!<$J^  
     break; 9C 05  
    case VK_SHIFT: //,'oh~W  
     MaskBits|=SHIFTBIT; ~.lH)  
     break; Z4-dF;7  
    default: //judge the key and send message DmrfD28j~F  
     break; kC5,yj  
   } n6Zx0ad?  
   for(int index=0;index<MAX_KEY;index++) |K-lg rA  
   { y m{/0&7  
    if(hCallWnd[index]==NULL) ~b[4'm@  
     continue; @(?4g-*E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I}v#r8'!  
    { &NQR*Tn  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); eM"mP&TTL  
     bProcessed=TRUE; sN}@b8o@  
    } ?t42=nvf  
   } UhTr<(@  
  } oI~Qo*4eh  
  if(!bProcessed){ zs:7!  
   for(int index=0;index<MAX_KEY;index++){ jq)|7_N  
    if(hCallWnd[index]==NULL) P0(~~z&%[  
     continue; Lx{N%;t*E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @b{u/:y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); F.5b|&@  
   } hNo>)$v!s  
  } IR8&4qOs  
 } mO> M=2A  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @<=#i  
} an`(?6d  
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BOOL InitHotkey() e:D"_B  
{ 9y*! W  
 if(hHook!=NULL){ ;_a oM&  
  nHookCount++; jFT V\|C  
  return TRUE; 26VdRy{[  
 } 2H+DT-hK  
 else gVJ#LJ  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); BQ:Kx_   
  if(hHook!=NULL) R<-C>D  
   nHookCount++; 15 11<,  
  return (hHook!=NULL); 'aP*++^   
} }2A1Yt:^P  
BOOL UnInit() ==Mi1Q#5C  
{ 5 hadA>d  
 if(nHookCount>1){ Hk*cO;c  
  nHookCount--; O9X:1>a@i  
  return TRUE; D>e\OfTR:  
 } C'2 =0oou  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Pq>[q?>?  
 if(unhooked==TRUE){ ~+ wamX3  
  nHookCount=0; g Pj0H&,.  
  hHook=NULL; %=8(B.I!  
 } J8BT%  
 return unhooked; :_a]T-GL  
} -+>r4P  
/B\-DP3K  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dKQV4dc>  
{ G1_@! 4  
 BOOL bAdded=FALSE; DjzBG*f/  
 for(int index=0;index<MAX_KEY;index++){ \g1@A"  
  if(hCallWnd[index]==0){ -b0'Q  
   hCallWnd[index]=hWnd; PZ(<eJ>  
   HotKey[index]=cKey; {ah~q}(P  
   HotKeyMask[index]=cMask; uEGPgYY(  
   bAdded=TRUE; GR[>mkW!M  
   KeyCount++; ^MHn2Cv/~  
   break; *Yu\YjLPG  
  } +Z<Q^5w@  
 } j~*Z7iu  
 return bAdded; L(n/uQ :  
} 51 +M_ ~  
i!$^NIcJ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) nWF4[<t  
{ &:I +]G/W  
 BOOL bRemoved=FALSE; LZC?383'  
 for(int index=0;index<MAX_KEY;index++){ y2$;t'  
  if(hCallWnd[index]==hWnd){ Cm;qDvj+u  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )USC  
    hCallWnd[index]=NULL; ]z=Vc#+!  
    HotKey[index]=0; ?g;ZbD  
    HotKeyMask[index]=0; 3!9 yuf  
    bRemoved=TRUE; IPR tm!  
    KeyCount--; B4:l*P'  
    break; 5Vo}G %g  
   } ;;'a--'"  
  } Ji:iKkI  
 } 4<Sa,~4  
 return bRemoved; 7 Y>`-\  
} MR_bq_)  
RjGB#AK  
void VerifyWindow() :-\ yy  
{ %^5@z1d,  
 for(int i=0;i<MAX_KEY;i++){ >`<2}Me6  
  if(hCallWnd!=NULL){ Fv);5LD  
   if(!IsWindow(hCallWnd)){ ^_KD&%M6  
    hCallWnd=NULL; bxdXZB n  
    HotKey=0; iE^a%|?}  
    HotKeyMask=0; V}|v!h[O8  
    KeyCount--; ? TT8|Os  
   } Ryq"\Q>+  
  } b LM"t0  
 } n1>,#|#  
} v^c<`i;  
z34>,0  
BOOL CHookApp::InitInstance() ^~6]0$yJ  
{ pP0Vg'V  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); sjzXJ`s  
 hins=AfxGetInstanceHandle(); Sn0gTsZ  
 InitHotkey(); 0)oN[  
 return CWinApp::InitInstance(); k<Tez{<  
} 3Q$'qZw p  
ytve1<.Ff  
int CHookApp::ExitInstance() XJ h:U0  
{ 7 ZL#f![{  
 VerifyWindow(); {y^|ET7  
 UnInit(); )jk1S  
 return CWinApp::ExitInstance(); .FKJ yzL  
} xEiX<lguyN  
Sc'c$/  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file pH\^1xj =  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) zd9]qo  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 27a* H1iQ  
#if _MSC_VER > 1000 7/|F9fF@M  
#pragma once i2:+h}o$e  
#endif // _MSC_VER > 1000 XW?ybH6  
9fuJJ3L[  
class CCaptureDlg : public CDialog .IH@_iX  
{ wt}%2x} x  
 // Construction 9PKoNd^e  
 public: H9~%#&fF  
  BOOL bTray; k%l_N)38  
  BOOL bRegistered; =F'M~3M   
  BOOL RegisterHotkey(); f#v#)Gp+  
  UCHAR cKey; Jh\: X<q  
  UCHAR cMask; j6e}7  
  void DeleteIcon(); 7rdw`  
  void AddIcon(); {x[;5TM  
  UINT nCount; X7H'Uk9:  
  void SaveBmp(); `8Jq~u6_Z  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Vm~qk  
  // Dialog Data /esVuz  
  //{{AFX_DATA(CCaptureDlg) >:jM}*dnL  
  enum { IDD = IDD_CAPTURE_DIALOG }; -MrtliepW*  
  CComboBox m_Key; E q=wdI  
  BOOL m_bControl; 7 DY WdDX  
  BOOL m_bAlt; v_z..-7Dq+  
  BOOL m_bShift; oQ%\[s$  
  CString m_Path; g8I!E$  
  CString m_Number; *qPdZ   
  //}}AFX_DATA M ?Ndy*]  
  // ClassWizard generated virtual function overrides qx2E-PDL;<  
  //{{AFX_VIRTUAL(CCaptureDlg) |.(CIu~b  
 public: ^Ti_<<X  
  virtual BOOL PreTranslateMessage(MSG* pMsg); -^iUVO`z  
 protected: $Ns,ts(ng  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support rBD(2M  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2$ |]Vj*Zs  
  //}}AFX_VIRTUAL 3I"NI.>*  
  // Implementation *K(k Kph  
 protected: +}^|dkc  
  HICON m_hIcon; W|25t)cJ8h  
  // Generated message map functions ^sifEgG*d  
  //{{AFX_MSG(CCaptureDlg) Qz@IK:B}  
  virtual BOOL OnInitDialog(); oTCzYY  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); `/O`OrZ1K  
  afx_msg void OnPaint(); Tm)GC_  
  afx_msg HCURSOR OnQueryDragIcon(); OJP5k/U$  
  virtual void OnCancel(); <b d1  
  afx_msg void OnAbout(); 8K0X[-hs8  
  afx_msg void OnBrowse(); q^ a|wTC  
  afx_msg void OnChange(); D<U 9m3  
 //}}AFX_MSG dGW {l]N  
 DECLARE_MESSAGE_MAP() SyK9Is{8  
}; %9C`  
#endif 9 Uha2o  
N] 14  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ZfPd0 p  
#include "stdafx.h" jt{9e:2%  
#include "Capture.h" >Mvka;T]  
#include "CaptureDlg.h" yiV G ]s  
#include <windowsx.h> (j' {~FB  
#pragma comment(lib,"hook.lib") 7qe7F l3  
#ifdef _DEBUG EntF@ln!  
#define new DEBUG_NEW MpO RGd  
#undef THIS_FILE ~|r~NO 7[  
static char THIS_FILE[] = __FILE__; mn]-rTr  
#endif t;8\fIW5  
#define IDM_SHELL WM_USER+1 8Q2]*%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T><{ze  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,~4H{{<j  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; d2rL 8jW  
class CAboutDlg : public CDialog TUh&d5a9H  
{ ]^=|Zd-  
 public: qib 7Z]j  
  CAboutDlg(); 6HoqEku/Q  
  // Dialog Data Hjs }  
  //{{AFX_DATA(CAboutDlg) 0YzsA#yv  
  enum { IDD = IDD_ABOUTBOX }; ^Q0&.hL@  
  //}}AFX_DATA ?Jt$a;  
  // ClassWizard generated virtual function overrides t5.`! 3EO  
  //{{AFX_VIRTUAL(CAboutDlg) X rF3kz!44  
 protected: pDu{e>S|:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *AZ?~ i^o  
  //}}AFX_VIRTUAL v`JF\"}S  
  // Implementation N.Dhu~V  
 protected: *E:x E/M!2  
  //{{AFX_MSG(CAboutDlg) qmZ2d!)o  
  //}}AFX_MSG o+nG3kRD  
  DECLARE_MESSAGE_MAP() xXX/]x>  
}; A\K,_&x1Z  
)^4hQ3BS  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) `Da+75 f6v  
{ '\`6ot8  
 //{{AFX_DATA_INIT(CAboutDlg) EYL]TeS  
 //}}AFX_DATA_INIT \PpXL*.  
} 7K&}C;+  
OL3UgepF  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 8j%'9vPi  
{ <FY&h#  
 CDialog::DoDataExchange(pDX); N{8"s&  
 //{{AFX_DATA_MAP(CAboutDlg) v*SAI]{#~  
 //}}AFX_DATA_MAP ]q{ PDZ   
} 6vto++  
y&"!m }  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) n~tqO!q  
 //{{AFX_MSG_MAP(CAboutDlg) {<2>6 _z  
 // No message handlers hd B |#t  
 //}}AFX_MSG_MAP #,L~w  
END_MESSAGE_MAP() rK7W(D}  
$I@GUtzjp  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ,CciTXf  
: CDialog(CCaptureDlg::IDD, pParent) J$Fnm\  
{ c<wavvfUo  
 //{{AFX_DATA_INIT(CCaptureDlg) P;vxT}1  
  m_bControl = FALSE; e+'%!w"B  
  m_bAlt = FALSE; MIq"Wy|Zs  
  m_bShift = FALSE; 3HZ~.  
  m_Path = _T("c:\\"); J~KX|QY.S  
  m_Number = _T("0 picture captured."); 8eluO ?p  
  nCount=0; G"T\=cQz  
  bRegistered=FALSE; uWjN2#&,  
  bTray=FALSE; q-nER<  
 //}}AFX_DATA_INIT G?`-]FMO  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ;+ azeW ^  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 0VN7/=n|  
} ,_jC$  
@x1 %)1  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) !Xj#@e  
{ qI%&ay"/  
 CDialog::DoDataExchange(pDX); V1B(|P  
 //{{AFX_DATA_MAP(CCaptureDlg) _qn?2u3mnR  
  DDX_Control(pDX, IDC_KEY, m_Key); \M{[f=6llh  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); @w\I qr  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 3e%nA8?  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); FJeiY#us  
  DDX_Text(pDX, IDC_PATH, m_Path); gAt~?HvW6  
  DDX_Text(pDX, IDC_NUMBER, m_Number); E{4 e<%Y,  
 //}}AFX_DATA_MAP gbDX7r-  
} 0:"2MSf>  
mdW~~-@H  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) F";.6%;AC  
//{{AFX_MSG_MAP(CCaptureDlg) F;8*H1  
 ON_WM_SYSCOMMAND()  c 6"Ib)  
 ON_WM_PAINT() ;au*V5a%  
 ON_WM_QUERYDRAGICON() ,zhJY ?sk  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 2N5`'  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) v4rW2F:X  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ZF6c{~D  
//}}AFX_MSG_MAP Ipe n  
END_MESSAGE_MAP() DkDoA;m  
k?*KnfVh!  
BOOL CCaptureDlg::OnInitDialog() _ \D"E>oM  
{ Y- )x Tn  
 CDialog::OnInitDialog(); ${I*nh>=  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); +bA%  
 ASSERT(IDM_ABOUTBOX < 0xF000); J0Z7 l  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 3BdX  
 if (pSysMenu != NULL) 8w_7O> 9  
 { o.m:3!RW  
  CString strAboutMenu; vDFGd-S  
  strAboutMenu.LoadString(IDS_ABOUTBOX); AiP!hw/V$  
  if (!strAboutMenu.IsEmpty()) xb:&(6\F  
  { }^xE|~p  
   pSysMenu->AppendMenu(MF_SEPARATOR); X(@uwX$m  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); -MBV $:_R  
  } D`[Khsf  
 } d$t40+v  
 SetIcon(m_hIcon, TRUE); // Set big icon DY\J[l<<  
 SetIcon(m_hIcon, FALSE); // Set small icon -TO\'^][X  
 m_Key.SetCurSel(0); w_hHfZ9E  
 RegisterHotkey(); ALc`t(..}A  
 CMenu* pMenu=GetSystemMenu(FALSE); a0=WfeT  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); T 2F6)e  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ,WD X(  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); :Y P#  
 return TRUE; // return TRUE unless you set the focus to a control d\]Yk]r  
} ;Hmp f0$  
wSEWwU[  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 0hY{<^"Y  
{ v6GPS1:a  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) i#/]KsSp  
 { W3H+.E  
  CAboutDlg dlgAbout; HCWNo  
  dlgAbout.DoModal(); Y}s@WJ  
 } {pL+2%`~  
 else %}-?bHB1c  
 { G2Vv i[c  
  CDialog::OnSysCommand(nID, lParam); P 43P]M2  
 } 0[Ht_qxb  
} 3djC;*,9,  
xtfBfA  
void CCaptureDlg::OnPaint() i,I B!x  
{ H/+B%2Zj  
 if (IsIconic()) gNYqAUG5  
 { UC HZ2&  
  CPaintDC dc(this); // device context for painting 3]RyTQ  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Hc^W%t~  
  // Center icon in client rectangle tM4 Cx  
  int cxIcon = GetSystemMetrics(SM_CXICON); TX=yPq  
  int cyIcon = GetSystemMetrics(SM_CYICON); T4)fOu3]  
  CRect rect; m3bCZ 9iE  
  GetClientRect(&rect); ) ZfdQ3  
  int x = (rect.Width() - cxIcon + 1) / 2; y5r4+2B  
  int y = (rect.Height() - cyIcon + 1) / 2; T 20&F  
  // Draw the icon Fqy\CMC  
  dc.DrawIcon(x, y, m_hIcon); t.p~\6Yi  
 } 5 Xn.CBd]  
 else lVOu)q@l7g  
 { @$9'@")  
  CDialog::OnPaint(); F$BbYf2i  
 } V#REjsf,t-  
} #@HF<'H}mu  
$+p?Y)h .  
HCURSOR CCaptureDlg::OnQueryDragIcon() LbEM^ D  
{ .*g0w`H5pU  
 return (HCURSOR) m_hIcon; ':{>a28=  
} a.N{-2ptH  
FMA6_fju4  
void CCaptureDlg::OnCancel() zk-.u}RBFG  
{ w| `h[/,  
 if(bTray) 7lV.[&aKW  
  DeleteIcon(); %yBB?cp+_  
  CDialog::OnCancel(); ,#MCn  
} 1W7% 1FA  
ljTBvU  
void CCaptureDlg::OnAbout() %`Z+a.~U  
{ S*o[ZA   
 CAboutDlg dlg; 0}!\$"|D  
 dlg.DoModal(); h8Yx#4  
} 7 d LuX   
;AO#xv+#  
void CCaptureDlg::OnBrowse() !?c|XdjZ  
{ .<@8gNm3  
 CString str; #@<9S{F  
 BROWSEINFO bi; [8tL"G6s  
 char name[MAX_PATH]; jC bV,0)^  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); _SW3_8SuM.  
 bi.hwndOwner=GetSafeHwnd(); ;rc`OZyE  
 bi.pszDisplayName=name; i&{DOI%w  
 bi.lpszTitle="Select folder"; k0Ol*L!p  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 2hzsKkrA {  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); {~Rk2:gx  
 if(idl==NULL) ]a5 f2lE  
  return; '%q$` KDb  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); (L^]Lk x)  
 str.ReleaseBuffer(); Ym3\pRFiD  
 m_Path=str; M#(+c_(r  
 if(str.GetAt(str.GetLength()-1)!='\\') *G* k6.9W!  
  m_Path+="\\"; !1e6Ss  
 UpdateData(FALSE); d3=KTTi\  
} :Nofp&  
phM>.y_  
void CCaptureDlg::SaveBmp() |*}4 m'c  
{ bv&;R  
 CDC dc; t+9][Adf  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); v`M3eh@$A  
 CBitmap bm; dKdj`wB  
 int Width=GetSystemMetrics(SM_CXSCREEN); |yx6X{$k  
 int Height=GetSystemMetrics(SM_CYSCREEN); 8F._9U-EN  
 bm.CreateCompatibleBitmap(&dc,Width,Height); &Z`#cMR{H  
 CDC tdc; hCC<?5q  
 tdc.CreateCompatibleDC(&dc); (1#J%  
 CBitmap*pOld=tdc.SelectObject(&bm); Q%xC}||1s"  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6i1LjLB  
 tdc.SelectObject(pOld); #Y$hNQQ$F  
 BITMAP btm; ?Y@N`S  
 bm.GetBitmap(&btm); dq]0X?[6  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; rzt Ru  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ZIQ [bE7  
 BITMAPINFOHEADER bih; %}%Qc6.H  
 bih.biBitCount=btm.bmBitsPixel; Z]B~{!W1  
 bih.biClrImportant=0; |UX(+; n  
 bih.biClrUsed=0; ]*AR,0N&  
 bih.biCompression=0; {WYX~Mvvj  
 bih.biHeight=btm.bmHeight; ZpnxecJUJ  
 bih.biPlanes=1; Za 1QC;7  
 bih.biSize=sizeof(BITMAPINFOHEADER); r-Pkfy(  
 bih.biSizeImage=size; H '  
 bih.biWidth=btm.bmWidth; 3f,hw5R  
 bih.biXPelsPerMeter=0; /pT =0=  
 bih.biYPelsPerMeter=0; B]Thn  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Q\ 0cvmU  
 static int filecount=0; #3gp6*R  
 CString name; 1,% R;7J=g  
 name.Format("pict%04d.bmp",filecount++); {GQ^fu;q  
 name=m_Path+name; INJEsz  
 BITMAPFILEHEADER bfh; 0$ S8 fF@  
 bfh.bfReserved1=bfh.bfReserved2=0; NxsBX :XDn  
 bfh.bfType=((WORD)('M'<< 8)|'B'); !wNr3LG  
 bfh.bfSize=54+size; 2.l:O2<  
 bfh.bfOffBits=54; tNbN7yI  
 CFile bf; d8c=L8~jt  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ R^Y <RI  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); |&zz,+E  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ee^{hQi  
  bf.WriteHuge(lpData,size); ?!` /m|"  
  bf.Close(); 0@%v1Oja  
  nCount++; *2,VyY  
 } AJF#Aw `o  
 GlobalFreePtr(lpData); E>D_V@,/  
 if(nCount==1) $w`=z<2yo1  
  m_Number.Format("%d picture captured.",nCount); )8$=C#qC[  
 else ^G}47(  
  m_Number.Format("%d pictures captured.",nCount); rR(X9i  
  UpdateData(FALSE); % ~H=sjg  
} u)+8S/ )  
E? ; 0)'h  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) T7hcnF$  
{ y.< m#Zzt  
 if(pMsg -> message == WM_KEYDOWN) woK&q7Vn  
 { RO'7\xvn  
  if(pMsg -> wParam == VK_ESCAPE) }E50>g  
   return TRUE; heV=)8  
  if(pMsg -> wParam == VK_RETURN) ^LoUi1j  
   return TRUE; 6\q]rfQ  
 } rE.;g^4p  
 return CDialog::PreTranslateMessage(pMsg); ;'#8tGv=  
} woGAf)vV#  
0"28'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9 a!$z!.  
{ x"~8*V'0  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ qKr8)}h  
  SaveBmp(); ~d|A!S`  
  return FALSE; m8d!< h  
} Dv5D~on{  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ #_^Lb]jkM  
 CMenu pop; e#$]Y?,  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); j i7[nY  
 CMenu*pMenu=pop.GetSubMenu(0); Lr~=^{  
 pMenu->SetDefaultItem(ID_EXITICON); (ROY?5 @c  
 CPoint pt; Y[}>CYO  
 GetCursorPos(&pt); #W4dkCd(pF  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); H4&lb}  
 if(id==ID_EXITICON) L.*M&Ry  
  DeleteIcon();  3KlbP  
 else if(id==ID_EXIT) 1W^t aJH]  
  OnCancel(); Krqtf  
 return FALSE; .6+Z^,3  
} =5~jx  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); FQ<Ju.  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) [+n*~  
 AddIcon(); \fz<.l]  
 return res; A$Hfr8w1u  
} R{<kW9!  
Q ayPo]O  
void CCaptureDlg::AddIcon() 8]/bK5`  
{ _E@2ZnD2  
 NOTIFYICONDATA data; hKL4cpK4  
 data.cbSize=sizeof(NOTIFYICONDATA); f!Y?S  
 CString tip; 5YE'L.  
 tip.LoadString(IDS_ICONTIP); -#u=\8  
 data.hIcon=GetIcon(0); %)zodf  
 data.hWnd=GetSafeHwnd(); r!_-"~`7E  
 strcpy(data.szTip,tip); g?goZPZB  
 data.uCallbackMessage=IDM_SHELL; cQy2"vtU  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; zPn+ V7F  
 data.uID=98; "O3tq =Q  
 Shell_NotifyIcon(NIM_ADD,&data); vWz m @  
 ShowWindow(SW_HIDE); ` Mjj@[  
 bTray=TRUE; *\+\5pu0  
} PUp6Q;AdQ  
H<i]V9r  
void CCaptureDlg::DeleteIcon() 0l)~i' '  
{ n' n/Tu   
 NOTIFYICONDATA data; ;K:zmH  
 data.cbSize=sizeof(NOTIFYICONDATA); bzBEX mC  
 data.hWnd=GetSafeHwnd(); x<tb  
 data.uID=98; s~ a"4~f  
 Shell_NotifyIcon(NIM_DELETE,&data); f-vCm 5f  
 ShowWindow(SW_SHOW); Gp?a(-K5  
 SetForegroundWindow(); [B\h$IcRv  
 ShowWindow(SW_SHOWNORMAL); xHv ZV<#  
 bTray=FALSE; f phv  
} #+Ir>GU  
#L=x%8B  
void CCaptureDlg::OnChange() e$<0 7Oc  
{ ^a0um/+M}  
 RegisterHotkey(); EN<F# Y3E  
} JVvs-bK5  
AVlhNIr  
BOOL CCaptureDlg::RegisterHotkey() 4VJ-,Z  
{ D=j-!{zB  
 UpdateData(); BKCA <  
 UCHAR mask=0; S 6@u@C  
 UCHAR key=0; 4KhV|#-;k  
 if(m_bControl) i1ixi\P{0  
  mask|=4; 6tgt>\y  
 if(m_bAlt) -`*a'p-=  
  mask|=2; V#2+"(7h  
 if(m_bShift) O,{6*[)@  
  mask|=1; xgVeN["  
  key=Key_Table[m_Key.GetCurSel()]; aL+ o /  
 if(bRegistered){ T0wW<_jh  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); HJ=:8:  
  bRegistered=FALSE; !![DJ  
 } X9v.1s,  
 cMask=mask; > kG GR  
 cKey=key; '\l"   
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "jeb%k  
 return bRegistered; #^u$  
} eBZXI)pPh  
.F98G/s  
  四、小结 TV)h`\|Z*  
DU0zez I9  
  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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