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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: 9<5ii  
  ngzQVaB9  
  一、实现方法 dDl_Pyg4K  
@`HW0Y_:  
  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: aQV?}  
KD'}9{F,  
#pragma data_seg("shareddata") vSk1/  
HHOOK hHook =NULL; //钩子句柄 S0;s 7X#c  
UINT nHookCount =0; //挂接的程序数目 cK'}+  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ;s5JYR  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 I3YSW  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 3 op{h6  
static int KeyCount =0; N^jr  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ;B;wU.Y"  
#pragma data_seg() ?*cCn-|  
~_ko$(;A  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 && WEBQ  
r`PD}6\  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: \_/dfmlIZ  
MFqb_q+  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR P} Y .  
cKey,UCHAR cMask) "}:SXAZ5`  
{ :PB W=W  
 BOOL bAdded=FALSE; 4"Mq]_D  
 for(int index=0;index<MAX_KEY;index++){ LKst QP!I  
  if(hCallWnd[index]==0){ B8zc#0!1  
   hCallWnd[index]=hWnd; dRBWJ/ 1T  
   HotKey[index]=cKey; e)|5 P  
   HotKeyMask[index]=cMask; 8/-hODoT_  
   bAdded=TRUE; 5B;;{GR  
   KeyCount++; Y7 e1%,$v  
   break; _]us1  
  } D`)K3;h  
 } )yS8(F0  
 return bAdded; 8 LsJ}c  
} OOzXA%<%c  
//删除热键 #m3!U(Og`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _hEr,IX=J  
{ ]x6r P  
 BOOL bRemoved=FALSE; c>wn e\(5H  
 for(int index=0;index<MAX_KEY;index++){ v R ! y#  
  if(hCallWnd[index]==hWnd){ @[]#[7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %4Yq (e  
    hCallWnd[index]=NULL; 2FEi-m}  
    HotKey[index]=0; w+hpi5OH  
    HotKeyMask[index]=0; [f=Y*=u9,  
    bRemoved=TRUE; 1/c+ug!y  
    KeyCount--; "FLiSz%ME  
    break; K/8TwB?I  
   } I\|.WrMNi  
  } cPX^4d~9  
 } >&Y\g?Z6G  
 return bRemoved; L!~ap  
} 0_-P~^A  
'v5q/l  
-6# _t  
  DLL中的钩子函数如下: ~g*5."-i  
BxB B](  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) zEw~t&:e  
{ Sp[]vm8N  
 BOOL bProcessed=FALSE; Cw~fP[5XMF  
 if(HC_ACTION==nCode) t_\&LMD  
 { H"wIa8A  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开  Rp6q)  
   switch(wParam) ^t,haO4  
   {  V2$M`|E  
    case VK_MENU: '|G8yojz  
     MaskBits&=~ALTBIT; [x -<O:r=P  
     break; {N@Pk[!  
    case VK_CONTROL: ?)7UqVyq  
     MaskBits&=~CTRLBIT; 'AZxR4W  
     break;  J {$c|  
    case VK_SHIFT: kT:?1w'  
     MaskBits&=~SHIFTBIT; c9+yU~(  
     break; UtHloq(r  
    default: //judge the key and send message @%r "7%tq>  
     break; n_*.i1\'w  
   } rGay~\  
   for(int index=0;index<MAX_KEY;index++){  =sk#`,,:  
    if(hCallWnd[index]==NULL) {5c]\{O?[  
     continue; CaV)F3   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uS! V_]  
    { T5wVJgN>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *O7PH1G  
     bProcessed=TRUE; M0%nGpVj>  
    } i\=I` Yn+  
   }  I^G6aw  
  } @QF;m  
  else if((lParam&0xc000ffff)==1){ //有键按下 Q|G|5X  
   switch(wParam) `)TgGny01  
   { yh.WTgcW  
    case VK_MENU: 'a>D+A:  
     MaskBits|=ALTBIT; -0<ZN(?|  
     break; )*aAkM  
    case VK_CONTROL: :)%cL8Nz]$  
     MaskBits|=CTRLBIT; Yh{5O3(;  
     break; $ SZIJe"K  
    case VK_SHIFT: <Ik5S1<h$H  
     MaskBits|=SHIFTBIT; #It!D5A  
     break; lLI%J>b@  
    default: //judge the key and send message Jv!f6*&<  
     break; gwFW+*h  
   } 6xu%M&ht  
   for(int index=0;index<MAX_KEY;index++){ OXbC\^qo@  
    if(hCallWnd[index]==NULL) *?+2%zP  
     continue; N:,V{Pw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) im F,8'  
    { @@=,bO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); TW=N+ye^1(  
     bProcessed=TRUE; {,= hIXo>  
    } _WI~b  
   } ZHCrKp  
  } A>\3FeU>UC  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 (R(NEN  
   for(int index=0;index<MAX_KEY;index++){ Bk5ft4v-  
    if(hCallWnd[index]==NULL) i*mI-l  
     continue; Q+Eqaz`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =nlj|S ~3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ^cuH\&&7  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 /'^ BH A|h  
   } "tu*(>'~5  
  } W!1 B~NH#  
 } k7M{+X6[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 7**zO3 H  
} ::@JL  
J!}R>mR  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ajX] ui  
rw?wlBEG%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8yM8O #S  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }&%&0$%  
|*L/ m0'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: 845\u&  
(@S 9>z4s  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |I3&a=,  
{ ,<[x9 "3\  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)  JY_!G  
 { %cASk>^i  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Bo ??1y  
  SaveBmp(); a~zh5==QD  
  return FALSE; D3y4e8+Z'  
 } GE\({V.W  
 …… //其它处理及默认处理 %h v-3L#V  
} R9UC0D:-x  
V=c?V/pl  
<ILi38%Y  
  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。 jn oX%3d-  
ac8su0  
  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。 )4H0Bz2G  
,? Q1JZPy@  
  二、编程步骤 8DFq eY0S  
/K_*Drk>  
  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"; 01IfvK  
Gi&/`vm  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; (V"7H  
@9\E  
  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; EdZNmL3cB  
xFyBF[c  
  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; eGo$F2C6E  
4ZB]n,pfT  
  5、 添加代码,编译运行程序。 NU[Wj uLG  
_V` QvnT}  
三、程序代码 ~L.5;8a3Pe  
ZQmg;L&7  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL $BOpjDV8  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) {<i(aq?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ""jl  
#if _MSC_VER > 1000 GD!!xt  
#pragma once !X=93%  
#endif // _MSC_VER > 1000 t`1~5#?Du(  
#ifndef __AFXWIN_H__ oOGFg3X  
#error include 'stdafx.h' before including this file for PCH FQcm =d_s  
#endif Z-aB[hE  
#include "resource.h" // main symbols Q|f)Awe$  
class CHookApp : public CWinApp (AHTv8  
{ #c-Jo[%G  
 public: q\Z9.T+Qo  
  CHookApp(); %@%~<U)W  
  // Overrides ;!EEzR.  
  // ClassWizard generated virtual function overrides oM,UQ!x <  
  //{{AFX_VIRTUAL(CHookApp) *k0;R[IAV  
 public: c32"$g  
  virtual BOOL InitInstance(); Qk&6Z%  
  virtual int ExitInstance(); )7WLbj!M  
  //}}AFX_VIRTUAL cN)noGkp  
  //{{AFX_MSG(CHookApp) H+Q_%%[N  
  // NOTE - the ClassWizard will add and remove member functions here. iF1zLI<A  
  // DO NOT EDIT what you see in these blocks of generated code ! RMAbu*D0  
  //}}AFX_MSG )(yKm/5 0  
  DECLARE_MESSAGE_MAP() ]Y f8  
}; mQ\oR|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); TaZlfe5z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^{-Z3Yxd  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &p=(0$0&-  
BOOL InitHotkey(); 4 rD&Lg'  
BOOL UnInit(); +^a@U^V  
#endif hxGo~<. :  
`[tYe<  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. QtOT'<2t]  
#include "stdafx.h" Z FIgKWZ'  
#include "hook.h" 7Ur'@wr  
#include <windowsx.h> {tnhP^C3>  
#ifdef _DEBUG :kucDQE({?  
#define new DEBUG_NEW Qq\hD@Z|  
#undef THIS_FILE 5_SxX@fW %  
static char THIS_FILE[] = __FILE__; u)l[*";S  
#endif &>XSQB(&%  
#define MAX_KEY 100 kqLpt  
#define CTRLBIT 0x04 [O6JVXO>  
#define ALTBIT 0x02 "mcuF]7F  
#define SHIFTBIT 0x01 ?)4c!3#  
#pragma data_seg("shareddata") Q>\9/DjUp  
HHOOK hHook =NULL; /-g%IeF  
UINT nHookCount =0; ;AT~?o`n  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey t s=+k/Z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Tg v]30F)  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey wA6<Buj D  
static int KeyCount =0; weIlWxy  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift )lVplAhZD  
#pragma data_seg() ;zi4W1  
HINSTANCE hins; OP DRV\  
void VerifyWindow(); q_:B=w+bC  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) -J++b2R\%  
//{{AFX_MSG_MAP(CHookApp) 'z Qp64]F  
// NOTE - the ClassWizard will add and remove mapping macros here. Y>K3.*.  
// DO NOT EDIT what you see in these blocks of generated code! ;*e$k7}F  
//}}AFX_MSG_MAP @oFuX.  
END_MESSAGE_MAP() ] -G~  
gR k+KGKn<  
CHookApp::CHookApp() 8uB6C0,6?  
{ , ins/-3  
 // TODO: add construction code here, h8HA^><Xr  
 // Place all significant initialization in InitInstance M_\)<a(8  
} MG$Df$R  
2}.EFQp+  
CHookApp theApp; ~Yl%{1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) o]0\Km  
{ n^rzl6dy  
 BOOL bProcessed=FALSE; $p.0[A(N  
 if(HC_ACTION==nCode) S&~;l/  
 { @|9V]bk  
  if((lParam&0xc0000000)==0xc0000000){// Key up 7XiR)jYo*  
   switch(wParam) m# I  
   { fMZc_dsW9  
    case VK_MENU: g=kuM  
     MaskBits&=~ALTBIT; }_cX" s  
     break; T28Q(\C:}  
    case VK_CONTROL: C?PgC~y)  
     MaskBits&=~CTRLBIT; E XQ 3(:&  
     break; ],Y+|uX->  
    case VK_SHIFT: gOn^}%4.I  
     MaskBits&=~SHIFTBIT; (%|L23  
     break;  Tv~Ys#  
    default: //judge the key and send message NSQf@o  
     break; Su[f"2oR  
   } U9yR~pw  
   for(int index=0;index<MAX_KEY;index++){ s#V:! 7  
    if(hCallWnd[index]==NULL) ~H`(zzk  
     continue; = p$:vW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) p}k\l dmh{  
    { *7!*kq g!u  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); <>[]- Vq  
     bProcessed=TRUE; (1;%V>,L  
    } mV'^4by  
   }  ?r(Bu  
  } wfBf&Z0{  
  else if((lParam&0xc000ffff)==1){ //Key down RQd5Q.  
   switch(wParam) __,}/|K2  
   { @m ?&7{y#?  
    case VK_MENU: -wn(J5NnR  
     MaskBits|=ALTBIT; )R"deb=s  
     break; !8OUH6{2  
    case VK_CONTROL: "?Xb$V7  
     MaskBits|=CTRLBIT; x '`L( C  
     break; Y1U\VU  
    case VK_SHIFT: -hpMd/F  
     MaskBits|=SHIFTBIT; 1$rrfg  
     break; T\$r|  
    default: //judge the key and send message Ih5F\eM  
     break; H%`|yUE(  
   } Ed&M  
   for(int index=0;index<MAX_KEY;index++) ;p2a .P  
   { 4Awl  
    if(hCallWnd[index]==NULL) -$5nqaK?  
     continue; 3']=w@~ O[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Lw #vHNf6  
    { ~0XV[$`L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); bY7~b/  
     bProcessed=TRUE; ^1w*$5YI  
    } @P}!mdH1  
   } s4Y7x.-  
  } '5m`[S-IU  
  if(!bProcessed){ 'Lv>!s 7  
   for(int index=0;index<MAX_KEY;index++){ / ,#&Htk  
    if(hCallWnd[index]==NULL) :TN^}RML  
     continue; {,b:f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;l2pdP4jf  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); pbb6?R,  
   } 'Gds?o8  
  } \H$j["3  
 } %4HpTx  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); X |X~|&j  
} vd!|k5t[d  
$4*k=+wS  
BOOL InitHotkey() z9[BQ(9t  
{ qECta'b&  
 if(hHook!=NULL){ z2.ZxL"*  
  nHookCount++; dzwto;  
  return TRUE; (.54`[2+L  
 } 5Rec~&v  
 else 4GTB82V$  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); gay6dj^  
  if(hHook!=NULL) \3v}:E+3  
   nHookCount++; 2zN%Z!a#J  
  return (hHook!=NULL); ?.b.mkJ  
} \Z%V)ZRi=  
BOOL UnInit() %["V "{ z  
{ w0N8a%  
 if(nHookCount>1){ e4?p(F-x(  
  nHookCount--;  [EU \-  
  return TRUE; X7gtR|[  
 } #9) D.d|5  
 BOOL unhooked = UnhookWindowsHookEx(hHook); $f]dL};  
 if(unhooked==TRUE){ 8st~ O  
  nHookCount=0; ~g[<A?0=y  
  hHook=NULL; 8rA?X*|S!  
 } .~Z@y#  
 return unhooked; M]$_>&"  
} $*[-kIy  
bp?4)C*R  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2Sg,b8  
{ wth*H$iF  
 BOOL bAdded=FALSE; -v7O*xm"  
 for(int index=0;index<MAX_KEY;index++){ >X!A/; $  
  if(hCallWnd[index]==0){ Swg%[r=p=  
   hCallWnd[index]=hWnd; D,J yb0BW  
   HotKey[index]=cKey; 4Sxt<7[f  
   HotKeyMask[index]=cMask; woCFkO;'O  
   bAdded=TRUE; ^`XTs!.  
   KeyCount++; k+FiW3-  
   break; *yxn*B_xZ  
  } ;iMgv5=  
 } El)WjcmH  
 return bAdded; Us*"g{PQ  
} ^|0>&sTHOH  
?yqTLj  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) N N;'QiE  
{ urK[v  
 BOOL bRemoved=FALSE; =-U8^e_Y  
 for(int index=0;index<MAX_KEY;index++){ YKT=0   
  if(hCallWnd[index]==hWnd){ IJt8 * cw  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Z#P:C":e  
    hCallWnd[index]=NULL; -N]%) Hy  
    HotKey[index]=0; l /\n7:  
    HotKeyMask[index]=0; M;Dk$B{;R  
    bRemoved=TRUE; HQO z  
    KeyCount--; '6&a8&:  
    break; 9s}y*Vp  
   } BCtm05  
  } 8S_v} NUm  
 } L&2 Zn{#`  
 return bRemoved; CnA0^JX  
} AT%@T|  
-I\Y m_)  
void VerifyWindow() ^Gs=U[**  
{ %[9d1F 3  
 for(int i=0;i<MAX_KEY;i++){ ~HH6=qjU)  
  if(hCallWnd!=NULL){ ') -Rv]xe  
   if(!IsWindow(hCallWnd)){ )+ss)L EC  
    hCallWnd=NULL; vtS [Tkk|A  
    HotKey=0; Os# V=P  
    HotKeyMask=0; J_=42aHO  
    KeyCount--; M)1? $'Aq  
   } T@ecWRro  
  } uqg#(ADy?R  
 } Px<*n '~}  
} zz 1e)W/  
xJ(4RaP  
BOOL CHookApp::InitInstance() ;^K4kK&f  
{ Mmu>&C\  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 7u9!:}Tu  
 hins=AfxGetInstanceHandle(); &CEZ+\bA  
 InitHotkey(); "}jY;d#n  
 return CWinApp::InitInstance(); =(x W7Pt~  
} z sZP\  
$stBB  
int CHookApp::ExitInstance() u(!@6%?-  
{ J^R#  
 VerifyWindow(); L,B#%t  
 UnInit(); gADEjr*H  
 return CWinApp::ExitInstance(); R} #6  
} DWQ@]\  
(K(6`~  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file JWuF ?<+k  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) !VJ5(b  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 9<ev]XaSl  
#if _MSC_VER > 1000 rprtp5Cg  
#pragma once xxN=,p  
#endif // _MSC_VER > 1000 wwtk6;8@  
-%*w&',G  
class CCaptureDlg : public CDialog 0DFxVH_xN  
{ mar BVFz~  
 // Construction eaI!}#>R +  
 public: P{-f./(JD  
  BOOL bTray; UF)4K3X  
  BOOL bRegistered; #l!Sz247  
  BOOL RegisterHotkey(); KF#,Q  
  UCHAR cKey; 3'H 1T  
  UCHAR cMask; y~cDWD <h  
  void DeleteIcon(); *Q@%< R  
  void AddIcon(); ^mu?V-4  
  UINT nCount; f.4m6"1  
  void SaveBmp(); HJn  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Z,~EH  
  // Dialog Data ,`3kDqS_4  
  //{{AFX_DATA(CCaptureDlg) ;be2sTo  
  enum { IDD = IDD_CAPTURE_DIALOG }; <opBOZ d  
  CComboBox m_Key; `6.rTs $<  
  BOOL m_bControl; Wy2 pa #Q  
  BOOL m_bAlt; $]G_^ji)K  
  BOOL m_bShift; JY|f zL  
  CString m_Path; ];.H]TIc6  
  CString m_Number; Xy>+r[$D:  
  //}}AFX_DATA PV*U4aP  
  // ClassWizard generated virtual function overrides nzdJ*C  
  //{{AFX_VIRTUAL(CCaptureDlg) St6U  
 public: YuZxKuGy  
  virtual BOOL PreTranslateMessage(MSG* pMsg); @GB~rfB[  
 protected: k8}*b&+{vz  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support g)<t=+a  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Lwg@*:`d  
  //}}AFX_VIRTUAL 0koC;(<n  
  // Implementation "Yo.]P U  
 protected: o0nKgq'w|x  
  HICON m_hIcon; J8T?=%?=  
  // Generated message map functions EMDsi2  
  //{{AFX_MSG(CCaptureDlg) W+&w'~M  
  virtual BOOL OnInitDialog(); ~ cKmf]  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); eJ+uP,$  
  afx_msg void OnPaint(); }K!)Z}8  
  afx_msg HCURSOR OnQueryDragIcon(); ng-g\&-  
  virtual void OnCancel(); z]NzLz9VfL  
  afx_msg void OnAbout(); `|1#Vuk  
  afx_msg void OnBrowse(); nQ0g,'o  
  afx_msg void OnChange(); F0O/SI(cA  
 //}}AFX_MSG a| *{BlY  
 DECLARE_MESSAGE_MAP() ov{  
}; w!0`JPu  
#endif ZE())W"  
wgK:^D P  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 6w d0"  
#include "stdafx.h" !z !R)6  
#include "Capture.h" Sc!{ o!9\  
#include "CaptureDlg.h" <Ct b^4$  
#include <windowsx.h> 0u]!C"VX  
#pragma comment(lib,"hook.lib") l@x/{0  
#ifdef _DEBUG ,Qgxf';+$  
#define new DEBUG_NEW bIR AwktD  
#undef THIS_FILE Q1fJ`A=  
static char THIS_FILE[] = __FILE__; q F \a]e  
#endif ay\e# )  
#define IDM_SHELL WM_USER+1 ?I6us X9$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); nV|H5i;N7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); eB`7C"Z  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; K[%)_KW  
class CAboutDlg : public CDialog ,DN>aEu1  
{ : GZx-  
 public: ?N 6'*2{NT  
  CAboutDlg(); v'"0Ya  
  // Dialog Data =tJ}itcJ'  
  //{{AFX_DATA(CAboutDlg) pq 4/>WzE  
  enum { IDD = IDD_ABOUTBOX }; |fx*F}1  
  //}}AFX_DATA 'n7 )()"2  
  // ClassWizard generated virtual function overrides )Q_^f'4  
  //{{AFX_VIRTUAL(CAboutDlg) hJavi>374  
 protected: <<zYF.9L]  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support KaJCfu yp  
  //}}AFX_VIRTUAL w`kn!k8  
  // Implementation e12.suv  
 protected: _H:mBk,,  
  //{{AFX_MSG(CAboutDlg) zj ;'0Zu  
  //}}AFX_MSG Y<'T;@  
  DECLARE_MESSAGE_MAP() 6!|-,t><  
};  vO 85h  
: Gp,d*M  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) f$G{7%9*  
{ jl;%?bx  
 //{{AFX_DATA_INIT(CAboutDlg) STDT]3.  
 //}}AFX_DATA_INIT '!)|;qe  
} Jww LAQ5  
!TJCQ[Aa }  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) _S43_hW  
{ _b+=q:$/  
 CDialog::DoDataExchange(pDX); jY>BU&  
 //{{AFX_DATA_MAP(CAboutDlg) sx;7  
 //}}AFX_DATA_MAP GA, 6G [E  
} wf4?{H  
prf  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) R<}n?f\#JZ  
 //{{AFX_MSG_MAP(CAboutDlg) }B{bM<dF  
 // No message handlers +Ar=89  
 //}}AFX_MSG_MAP "~y@rqIba  
END_MESSAGE_MAP() qNI2+<u)j  
('qu#.'  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) (Kl96G<Wej  
: CDialog(CCaptureDlg::IDD, pParent) <r_L-  
{ yF &"'L  
 //{{AFX_DATA_INIT(CCaptureDlg) Nr\[|||%  
  m_bControl = FALSE; m{(G%n>E&  
  m_bAlt = FALSE; 'lPt.*Y<u  
  m_bShift = FALSE; vf=b5s(7Q  
  m_Path = _T("c:\\"); 0ZY.~b'eu  
  m_Number = _T("0 picture captured."); Ax*=kZmH|  
  nCount=0; -!OFt}  
  bRegistered=FALSE; teO%w9ByY  
  bTray=FALSE; P8l x\DA  
 //}}AFX_DATA_INIT `uz15])1<  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 $9pFRQC'q  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); KTV~g@Jf  
} Sm6hyZFy  
1wX0x.4d  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) R;2tb7o  
{ }%K)R 5C  
 CDialog::DoDataExchange(pDX); H 1`}3}"  
 //{{AFX_DATA_MAP(CCaptureDlg) otQulL)T/  
  DDX_Control(pDX, IDC_KEY, m_Key); ;A ~efC^<  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); > YHwWf-  
  DDX_Check(pDX, IDC_ALT, m_bAlt); O s*B%,}  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); h rL_. 4  
  DDX_Text(pDX, IDC_PATH, m_Path); 8lAs~c  
  DDX_Text(pDX, IDC_NUMBER, m_Number); gOkq>i_  
 //}}AFX_DATA_MAP jmgU'w-s  
} {\!_S+}{  
3urL*Fw,  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) gxry?':  
//{{AFX_MSG_MAP(CCaptureDlg) U$; FOl  
 ON_WM_SYSCOMMAND() AV"fOK;#A  
 ON_WM_PAINT() ^oNk}:>  
 ON_WM_QUERYDRAGICON() 0/7y&-/(  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) zJE$sB.f  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Bvke@|]kW  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Q{hXP*5  
//}}AFX_MSG_MAP 1bW[RK;GE  
END_MESSAGE_MAP() =|)W#x9=  
N# o" W  
BOOL CCaptureDlg::OnInitDialog() Jx# r  
{ da c?b (  
 CDialog::OnInitDialog(); 9[<,49  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 6#egy|("nF  
 ASSERT(IDM_ABOUTBOX < 0xF000); 5^"T `,${  
 CMenu* pSysMenu = GetSystemMenu(FALSE); }!tJ3G  
 if (pSysMenu != NULL) CRK%%;=>  
 { =|lw~CW  
  CString strAboutMenu; |P{K\;-  
  strAboutMenu.LoadString(IDS_ABOUTBOX); A^/$ |@  
  if (!strAboutMenu.IsEmpty()) MO7:ZYq  
  { Vo@[  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9,h'cf`F  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ?T+Uu  
  } fv1pA+zN[  
 } 6$"gm$3O]  
 SetIcon(m_hIcon, TRUE); // Set big icon 9.F+)y@  
 SetIcon(m_hIcon, FALSE); // Set small icon F$l]#G.@A  
 m_Key.SetCurSel(0); K!|%mI8gk  
 RegisterHotkey(); wB(A['k  
 CMenu* pMenu=GetSystemMenu(FALSE); K8,fw-S%  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); e K%~`Y  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); }]0f -}  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 9mdp \A  
 return TRUE; // return TRUE unless you set the focus to a control i #5rk(^t  
} h{s- e.  
j7&57'  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $tGk,.#j  
{ C]22 [v4  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) x.Sq2rw]V  
 { SDY!!.  
  CAboutDlg dlgAbout; qPJU}(9#B  
  dlgAbout.DoModal(); {1H3VSYq  
 } Q fI =  
 else 8mM^wT  
 { 1BQB8i-,  
  CDialog::OnSysCommand(nID, lParam); mlolSD;7  
 } lM1Y }  
} ^4Ta0kDn  
D8u_Z<6IjI  
void CCaptureDlg::OnPaint() J1,\Q<  
{ 01md@4NQ  
 if (IsIconic()) ?n$;l-m[  
 { 39s%CcI`k  
  CPaintDC dc(this); // device context for painting ifA{E}fRZP  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Zj )Bd* a  
  // Center icon in client rectangle KMsm2~P  
  int cxIcon = GetSystemMetrics(SM_CXICON); hhu !'(j  
  int cyIcon = GetSystemMetrics(SM_CYICON); Isa]5>  
  CRect rect; *ujn+0)[  
  GetClientRect(&rect); `WDN T0@M  
  int x = (rect.Width() - cxIcon + 1) / 2; _e/>CiN/  
  int y = (rect.Height() - cyIcon + 1) / 2; -J?i6BHb  
  // Draw the icon 7<W7pXDp  
  dc.DrawIcon(x, y, m_hIcon); <VB;J5Rv  
 } xngK_n  
 else $_N<! h*\  
 { ?:bW@x  
  CDialog::OnPaint(); F\1{bN|3  
 } E|!rapa  
} <a@'Pcsk  
V#!ftu#c?  
HCURSOR CCaptureDlg::OnQueryDragIcon() \ "193CW!  
{ Vj^<V|=  
 return (HCURSOR) m_hIcon; AplXl=  
} !C&!Wj  
A;~u"g'z&  
void CCaptureDlg::OnCancel() 52-Gk2dp  
{ tlo"tl_]  
 if(bTray) =;(wBj  
  DeleteIcon(); k(>hboR5n  
  CDialog::OnCancel(); Q_<CG[,6D1  
} X( m&  
U0}]3a0  
void CCaptureDlg::OnAbout() 4%#C _pE9  
{ r"s <;  
 CAboutDlg dlg; gie}k)&M  
 dlg.DoModal(); )L?JH?$C  
} T7E9l  
\wY? 6#;  
void CCaptureDlg::OnBrowse() 2+pLDIIT  
{ HbWl:yU  
 CString str; D{~mJDUzK  
 BROWSEINFO bi; 9o7E/wP  
 char name[MAX_PATH]; Rn={:u4  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); jBexEdH  
 bi.hwndOwner=GetSafeHwnd(); bqmOfGM  
 bi.pszDisplayName=name; wpw~[xd  
 bi.lpszTitle="Select folder"; !QoOL<(){  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; S?.2V@Ic  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); !Kv.v7'N/k  
 if(idl==NULL) yQ)y#5/<6  
  return; wTBp=)1)f  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); q7-Eu4w  
 str.ReleaseBuffer(); uQ4WM  
 m_Path=str; zItf>j7|Z  
 if(str.GetAt(str.GetLength()-1)!='\\') !2oe;q2X[G  
  m_Path+="\\"; }0Isi G  
 UpdateData(FALSE); x|/zn<\^  
} ?A7&SdJaO  
p;av63 i  
void CCaptureDlg::SaveBmp() Bor_Kib  
{ ;hsgi|Cy-  
 CDC dc; MrIo.  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); |1`|E- S=  
 CBitmap bm; o ~"?K2@T  
 int Width=GetSystemMetrics(SM_CXSCREEN); 8E`rs)A  
 int Height=GetSystemMetrics(SM_CYSCREEN); .%>UA|[~:  
 bm.CreateCompatibleBitmap(&dc,Width,Height); kb>:M.  
 CDC tdc; Yv!%Is  
 tdc.CreateCompatibleDC(&dc); +.UdEIR";M  
 CBitmap*pOld=tdc.SelectObject(&bm); 9H5S@w[je  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *RKYdwnb  
 tdc.SelectObject(pOld); A-:58Qau+  
 BITMAP btm; )cc:Z7p  
 bm.GetBitmap(&btm); :4|W;Lkd!  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; gD0O7KO  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); d)m +Hc.  
 BITMAPINFOHEADER bih; 2T!pFcc  
 bih.biBitCount=btm.bmBitsPixel; ; 2K_u  
 bih.biClrImportant=0; 09y%FzV  
 bih.biClrUsed=0; 7VkT(xnm  
 bih.biCompression=0; aL@myq.  
 bih.biHeight=btm.bmHeight; :| J' HCth  
 bih.biPlanes=1; *7<5 G{  
 bih.biSize=sizeof(BITMAPINFOHEADER); :AYp{"{  
 bih.biSizeImage=size; ffo{ 4er  
 bih.biWidth=btm.bmWidth; `"J=\3->  
 bih.biXPelsPerMeter=0; qYj EQz  
 bih.biYPelsPerMeter=0; X-Y:)UT  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 0sW=;R2  
 static int filecount=0; &d]%b`EXq  
 CString name; H3T4v1o6  
 name.Format("pict%04d.bmp",filecount++); N( 0G!sTI  
 name=m_Path+name; gE^ {@^  
 BITMAPFILEHEADER bfh; g1-^@&q  
 bfh.bfReserved1=bfh.bfReserved2=0; \ 4y7!   
 bfh.bfType=((WORD)('M'<< 8)|'B'); wowv>!N!X-  
 bfh.bfSize=54+size; p(/PG+  
 bfh.bfOffBits=54; F8S -H"  
 CFile bf; XiE  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ w[Ee#Yaj.-  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); zrYhx!@  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); bY:A7.p7#  
  bf.WriteHuge(lpData,size); k4te[6)  
  bf.Close(); .]`LR@qf  
  nCount++; 7a.$tT  
 } >h>X/a(=~  
 GlobalFreePtr(lpData); zg,?aAm  
 if(nCount==1) Rk8>Ak(/  
  m_Number.Format("%d picture captured.",nCount); a[iuE`  
 else f Co-ony  
  m_Number.Format("%d pictures captured.",nCount); s-]k7a 2V  
  UpdateData(FALSE); _y{z%-  
} w[@>k@=  
7!Z\B-_,  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -MZ LkSU  
{ 6tXx--Nh  
 if(pMsg -> message == WM_KEYDOWN) jt-Cy  
 { P]A>"-k  
  if(pMsg -> wParam == VK_ESCAPE) iD=VNf  
   return TRUE; v[VUX69  
  if(pMsg -> wParam == VK_RETURN) 7)sEW#d!  
   return TRUE; K:&FWl.  
 } .ky((  
 return CDialog::PreTranslateMessage(pMsg); z+5l: f  
} ~[bS+ ]d!  
i{zg{$U  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) BG!;9Z{u  
{ 7r,'a{Rcn  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ vKYdYa\  
  SaveBmp(); z6e)|*cA$  
  return FALSE; 7:x%^J+  
} B,?Fjot#m  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ uKF?UXc  
 CMenu pop; $ )ps~  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); &RQQVki3  
 CMenu*pMenu=pop.GetSubMenu(0); =~Oi:+L  
 pMenu->SetDefaultItem(ID_EXITICON); "5*n(S{ks  
 CPoint pt; p?S:J`q  
 GetCursorPos(&pt); e R"XXF0u  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); K 2PV^Y  
 if(id==ID_EXITICON) Q7oJ4rIP  
  DeleteIcon(); <I .p{Z  
 else if(id==ID_EXIT) `k~.>#  
  OnCancel(); Oo{+W 5[  
 return FALSE; }Th":sin},  
} *gRg--PY%  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 2Eg* Yb 1  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ;4<CnC**  
 AddIcon(); =Ly7H7Q2  
 return res; kgfOH.P  
} W!B4~L  
Z}_{@|  
void CCaptureDlg::AddIcon() w5uOi}T\  
{ b'Cy!dr  
 NOTIFYICONDATA data;  |/K+tH  
 data.cbSize=sizeof(NOTIFYICONDATA); idiJ|2T"G  
 CString tip; <1#v}epD#  
 tip.LoadString(IDS_ICONTIP); 1.WdxMpW9  
 data.hIcon=GetIcon(0); 7e$\|~<  
 data.hWnd=GetSafeHwnd(); kGhWr M  
 strcpy(data.szTip,tip); t/z]KdK P  
 data.uCallbackMessage=IDM_SHELL; MIo5Y`T  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; IgH[xwzy[  
 data.uID=98; It,m %5 Py  
 Shell_NotifyIcon(NIM_ADD,&data); JJJlgr]#  
 ShowWindow(SW_HIDE); g;)xf?A9q  
 bTray=TRUE; - Z?rx5V;t  
} ldcYw@KQ  
}}Ah-QU  
void CCaptureDlg::DeleteIcon() seWYY $$  
{ c`~aiC`l  
 NOTIFYICONDATA data; x]umh{H~  
 data.cbSize=sizeof(NOTIFYICONDATA); 41 sClC"  
 data.hWnd=GetSafeHwnd(); ~J1;Z0}#  
 data.uID=98; |0:&d w?*!  
 Shell_NotifyIcon(NIM_DELETE,&data); Ep-{Ew{T_=  
 ShowWindow(SW_SHOW); v w$VR PW  
 SetForegroundWindow(); .&d]7@!qy  
 ShowWindow(SW_SHOWNORMAL); |@pJ]  
 bTray=FALSE; Gs$<r~Tg  
} pnin;;D*  
\zA$|) x  
void CCaptureDlg::OnChange() O[[:3!6q  
{ h _6QVab@  
 RegisterHotkey(); #iD5& klo\  
} UKyOkuY:w  
rQT@:$ )  
BOOL CCaptureDlg::RegisterHotkey() Hb5^+.xur  
{ V#jFjObTN  
 UpdateData(); {'dpRq{c|  
 UCHAR mask=0; |aef$f5  
 UCHAR key=0; rqk1 F~j|  
 if(m_bControl) ^yDCX  
  mask|=4; >QRpRHtb  
 if(m_bAlt) lO},fM2j  
  mask|=2; Omo1p(y  
 if(m_bShift) i-!Z/,oL  
  mask|=1; sxM0c  
  key=Key_Table[m_Key.GetCurSel()]; ]F5?>du@~  
 if(bRegistered){ ##VS%&{  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ^44AE5TO  
  bRegistered=FALSE; =KJK'1m9  
 } w^N xR,  
 cMask=mask; l +RT>jAmK  
 cKey=key; J<dr x_gc  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); -+4:} sD  
 return bRegistered; ($:s}_<>s  
} K~**. NF-n  
D*3\4=6x  
  四、小结 *44^M{ti<  
l]R O'  
  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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