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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:  h@W}xT  
  %J|EDf ,M  
  一、实现方法 8l='Hl  
kOtC(\]5  
  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: tOspDPSXX  
gVG :z_6  
#pragma data_seg("shareddata") "r"Y9KODm  
HHOOK hHook =NULL; //钩子句柄 ^kt"n( P5  
UINT nHookCount =0; //挂接的程序数目 R o-Mex2  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 .f jM9G#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 3I"&Qp%2  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey K] Eq"3  
static int KeyCount =0; k.lnG5e  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 mD)Nh  
#pragma data_seg() E#HO0 ]S  
&)bar.vw/  
  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。 %{HqF>=~  
:=i0$k<E/  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: /au\OBUge  
cOUO_xp(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR hlUF9}  
cKey,UCHAR cMask) Nju7!yVM_  
{ W1: o2 C7  
 BOOL bAdded=FALSE; CS"p[-0  
 for(int index=0;index<MAX_KEY;index++){ &UzZE17R  
  if(hCallWnd[index]==0){ ! prU!5-  
   hCallWnd[index]=hWnd; dvL'>'g  
   HotKey[index]=cKey; C62<pLJf  
   HotKeyMask[index]=cMask; .Zwn{SMtu  
   bAdded=TRUE; Np/[MC  
   KeyCount++; sL\|y38'  
   break; pnqjAT GU  
  } ;bAy 7  
 } I) Y$?"  
 return bAdded; |Zt=8}di  
} 8"<!8Img  
//删除热键 W B!$qie\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (yXVp2k  
{ N`zHe*=[~  
 BOOL bRemoved=FALSE; g:2/!tujL  
 for(int index=0;index<MAX_KEY;index++){ @x=CMF15  
  if(hCallWnd[index]==hWnd){ "n8_Ag@r  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Zy!\=-dSm  
    hCallWnd[index]=NULL; ~Yr.0i.W  
    HotKey[index]=0; QY^ y(I49  
    HotKeyMask[index]=0; EI_J7J+  
    bRemoved=TRUE; IsRsjhg8x  
    KeyCount--; 2XI%4  
    break; SA/0Z=  
   } +6;OB@  
  } w1KQ9H*  
 } aoJ&< vl3  
 return bRemoved; {;-$;\D  
} gf3/kll9  
8wy"m=>=b}  
1:&$0jU&U  
  DLL中的钩子函数如下: u5,IH2BU  
ZR#UoYjupb  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) PkVXn  
{ GB !3Z  
 BOOL bProcessed=FALSE; "^trHh8=  
 if(HC_ACTION==nCode) 1gt[_P2u  
 { d@w I: 7  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 {==Q6BG*  
   switch(wParam) qkBnEPWZy  
   {  ZO;]Zt]  
    case VK_MENU: v$mA7|(t!  
     MaskBits&=~ALTBIT; 5S7Z]DXiT8  
     break; CY 7REF  
    case VK_CONTROL: M0"feq  
     MaskBits&=~CTRLBIT; lO) B/N&  
     break; Tl1?5  
    case VK_SHIFT: #`W8-w  
     MaskBits&=~SHIFTBIT; XG [%oL  
     break; /z'j:~`E  
    default: //judge the key and send message R1 wd Q8q  
     break; MRC5c:(  
   } e1IuobT  
   for(int index=0;index<MAX_KEY;index++){ /0\pPc*kA{  
    if(hCallWnd[index]==NULL) S\X_!|  
     continue; $jzk4V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T }8aj  
    { 0SDCo\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); AVJF[t,  
     bProcessed=TRUE; m0#hG x  
    } u( o@_6  
   } 7dakj>JM  
  }  o j^U  
  else if((lParam&0xc000ffff)==1){ //有键按下 /J6CSk  
   switch(wParam) -5qO}^i$a  
   { {otvJ |'N  
    case VK_MENU: ~Ep&:c4:D  
     MaskBits|=ALTBIT;  I&v B\A  
     break; ~kHir]jc  
    case VK_CONTROL: /;lk.-yU  
     MaskBits|=CTRLBIT; l9jcoVo .  
     break; D H.ljGb  
    case VK_SHIFT: 3dM6zOK  
     MaskBits|=SHIFTBIT; @V-ZV  
     break; F-R`'{ ka  
    default: //judge the key and send message c49#aN R  
     break; "d#s|_n,d)  
   } #zQkQvAT9  
   for(int index=0;index<MAX_KEY;index++){ <AIsNqr  
    if(hCallWnd[index]==NULL) F0!r9U((  
     continue; &B.r&K&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dn5v|[dJ  
    { q{@Wn]!k  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); s R~&S))  
     bProcessed=TRUE; %z.G3\s0  
    } BNByaC  
   } IM#+@vv  
  } =?2y <B  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 c]LH.  
   for(int index=0;index<MAX_KEY;index++){ v_ J.M]  
    if(hCallWnd[index]==NULL) tb i;X=5  
     continue; /qCYNwWH9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) J\%:jg( m  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Z  b1v  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 f"tO*/|`  
   } hw7_8pAbh  
  } T-@pTJ !K9  
 } -Rvxjy)[N  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); .dfTv/n  
} 226s:\d  
&l.^UQ   
  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: @N(jd($E  
*p-Fn$7\n  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }Q%>Fv  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); < d]|5  
kal8k-$#  
  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: s=$7lYX  
l:ED_env:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _5)#{ o<  
{ WLpn,8qsY  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) OBZ|W**N"  
 { /X:lt^?%I  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 @U)'UrNr~  
  SaveBmp(); 6M6QMg^  
  return FALSE; ,'9tR&S$_  
 } Dux`BKl  
 …… //其它处理及默认处理 G^R;~J*TDE  
} -Z Z$ 1E  
GWhZ Mj  
aw 7f$Fqk  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。  ZBXGu f  
lfA  BF  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ^DH*@M  
9,Mp/.T"\  
  二、编程步骤 ~;+vF-]R  
MJb = +L  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 7^; OjO@8  
d#*5U9\z  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; N!v@!z9Mu  
ArEpH"}@  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; `8-aHPF-  
!G,$:t1-=V  
  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; ^Pf&C0xXv  
I>xB.$A  
  5、 添加代码,编译运行程序。 4"2/"D0  
<\8   
三、程序代码 =oTYwU  
U&5zs r  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL SQ!lgm1bA  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ]UI+6}r  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ~ /[Cgh0  
#if _MSC_VER > 1000 CvW((<?  
#pragma once +wSm6*j7=  
#endif // _MSC_VER > 1000  LJ))  
#ifndef __AFXWIN_H__ e.+)0)A-  
#error include 'stdafx.h' before including this file for PCH +E:(-$"R  
#endif Id*^H:]C#  
#include "resource.h" // main symbols g#:XN  
class CHookApp : public CWinApp pd1m/:  
{ ;?!rpj  
 public: E oR(/*'  
  CHookApp(); OT[m g4&  
  // Overrides U{_s1  
  // ClassWizard generated virtual function overrides 7`/qL "  
  //{{AFX_VIRTUAL(CHookApp) rrWk&;?  
 public: ]aRD6F:L  
  virtual BOOL InitInstance(); qWpCe*C  
  virtual int ExitInstance(); &V3oW1*W  
  //}}AFX_VIRTUAL ) T1 oDk  
  //{{AFX_MSG(CHookApp) *N r|G61  
  // NOTE - the ClassWizard will add and remove member functions here. >FHsZKJ  
  // DO NOT EDIT what you see in these blocks of generated code ! Fdw[CYHz  
  //}}AFX_MSG ."X~?Nk  
  DECLARE_MESSAGE_MAP() Yel(}Ny  
}; =Q}mJs  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); h%s  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); eh>E).  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )r i3ds  
BOOL InitHotkey(); 713M4CtJ  
BOOL UnInit(); nc~d*K\!  
#endif @>@Nu g2   
QL2y,?Mz7  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. B|=maz:_  
#include "stdafx.h" 5)7mjyo%  
#include "hook.h" /vDF<HVzm  
#include <windowsx.h> 55LF  
#ifdef _DEBUG 1hyah.i]Y  
#define new DEBUG_NEW mv.I.EL  
#undef THIS_FILE V^z;^mdd  
static char THIS_FILE[] = __FILE__; )T5h\ZO`;  
#endif %m) h1/l  
#define MAX_KEY 100 )JQQ4D  
#define CTRLBIT 0x04 yTt (fn:;  
#define ALTBIT 0x02 ->&VbR)  
#define SHIFTBIT 0x01 ~k0)+D}  
#pragma data_seg("shareddata") O`jA-t  
HHOOK hHook =NULL; S1`0d9ds#  
UINT nHookCount =0; `_A?a_[*  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey PJ@,01  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT [Be53U{=  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey "T%'Rp`j|  
static int KeyCount =0; p.] .M"A  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift @%nUfG7TQ  
#pragma data_seg() xJLO\B+gM  
HINSTANCE hins; |a$w;s>\  
void VerifyWindow(); Z{4aGp*  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) #ljg2:I+  
//{{AFX_MSG_MAP(CHookApp) 9:i,WJO  
// NOTE - the ClassWizard will add and remove mapping macros here. (y=o]Vy  
// DO NOT EDIT what you see in these blocks of generated code! (I ds<n"  
//}}AFX_MSG_MAP K=?F3tX^  
END_MESSAGE_MAP() &jZ|@K?  
Q3%# o+R>  
CHookApp::CHookApp() #(+HSZm  
{ i;zGw.;Q  
 // TODO: add construction code here, 9*+0j2uhQ  
 // Place all significant initialization in InitInstance !#:$u=  
}  RhNaYO  
+ 4g%?5'  
CHookApp theApp; 51opP8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) d 4\E  
{ >MWpYp  
 BOOL bProcessed=FALSE; ynbpewaa  
 if(HC_ACTION==nCode) yLO &(Mb  
 { :@`(}5F4  
  if((lParam&0xc0000000)==0xc0000000){// Key up w1#jVcUQ  
   switch(wParam) kr`BUW3  
   { , ."(Gp  
    case VK_MENU: nl9Cdi]o  
     MaskBits&=~ALTBIT; E D^rWE_  
     break; -f2`qltjb  
    case VK_CONTROL: ?U/Wio$@  
     MaskBits&=~CTRLBIT; `6N-MsP  
     break; XQJ^)d00h  
    case VK_SHIFT: u%1k  
     MaskBits&=~SHIFTBIT; o-=d|dWG  
     break; _#D\*0J  
    default: //judge the key and send message d<Q+D1  
     break; iynS4]`U  
   } tP Efz+1N  
   for(int index=0;index<MAX_KEY;index++){ hJo^Wo  
    if(hCallWnd[index]==NULL) Y-3[KHD  
     continue; L^Q+Q)zTh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hRa(<ZK  
    { #f3;}1(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); KCh  
     bProcessed=TRUE; 27],O@ 2?L  
    } vMX6Bg8  
   } n *i'vtQ8  
  } ow+Dd[i  
  else if((lParam&0xc000ffff)==1){ //Key down EdAR<VfleA  
   switch(wParam) A]iv)C;]  
   { k g,ys4  
    case VK_MENU: Wbn[Q2h5  
     MaskBits|=ALTBIT; ( OyY_`  
     break; $JhZ'Z  
    case VK_CONTROL: k=mT!  
     MaskBits|=CTRLBIT; n;kciTD%wK  
     break; ('* *nP  
    case VK_SHIFT: b4)*<Zp`  
     MaskBits|=SHIFTBIT; h lkvk]v  
     break; (}FW])y  
    default: //judge the key and send message { 0%TMiVf  
     break; ~0F9x9V  
   } a()6bRc~T  
   for(int index=0;index<MAX_KEY;index++) BgkB x  
   { {Bq"$M!Y  
    if(hCallWnd[index]==NULL) 9]L!.  
     continue; [7e{=\`=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;o)=XEh8P  
    { ]]uzl0LH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); :PD`PgQ  
     bProcessed=TRUE; `\ef0  
    } Z<N&UFw7QJ  
   } P~\a)Szy  
  } WS1&3mOd  
  if(!bProcessed){ prlyaq;4  
   for(int index=0;index<MAX_KEY;index++){ Wj4^W<IO  
    if(hCallWnd[index]==NULL) !2Xr~u7a  
     continue; rv,NQZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) A3MZxu=':3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); NF/Ti5y  
   } rwL=R,  
  } V5u}C-o  
 } MvZ+n  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); M9Nk=s! 3  
} hJ;f1dZ7}  
s!@=rq  
BOOL InitHotkey() {UdcX~\~  
{ AB2mt:^  
 if(hHook!=NULL){ \ W 'i0+  
  nHookCount++; (:?5 i`  
  return TRUE; t+3   
 } nIyROhZ  
 else lrs0^@.+  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); #QTfT&m+G}  
  if(hHook!=NULL) AaVI%$  
   nHookCount++; jr, &=C(  
  return (hHook!=NULL); DJViy  
} g[EM]q,  
BOOL UnInit() mq J0z4I}  
{ vo(g0Au)  
 if(nHookCount>1){ pcI&  
  nHookCount--; bkr~13S{+  
  return TRUE; qGpP,  
 } p.rdSv(8'  
 BOOL unhooked = UnhookWindowsHookEx(hHook); mUrS &&fu8  
 if(unhooked==TRUE){ !2zo]v4?  
  nHookCount=0; FJsK5-  
  hHook=NULL; c~gNH%1XN  
 } xb =8t!  
 return unhooked; 5JBB+g  
} vzY'+9q1.  
]aC ':55(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %[]"QbF?  
{ {cR_?Y@  
 BOOL bAdded=FALSE; ~\IF9!  
 for(int index=0;index<MAX_KEY;index++){ cBz!U 8(  
  if(hCallWnd[index]==0){ u}K5/hC  
   hCallWnd[index]=hWnd; eJU;*] xfH  
   HotKey[index]=cKey; !,cQ'*<W8-  
   HotKeyMask[index]=cMask; zmrQf/y{R  
   bAdded=TRUE; (KT38RhA  
   KeyCount++; MU_!&(X_  
   break; LP^p~5Az  
  } 81GQijq  
 } rNxrQ  
 return bAdded; dT5J-70Fl  
} { 1+Cw?1d  
Nk96"P$P  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) c3=-Mq9Q  
{ _1I K$gb[  
 BOOL bRemoved=FALSE; E]?)FH<oP  
 for(int index=0;index<MAX_KEY;index++){ v<L=!-b^  
  if(hCallWnd[index]==hWnd){ H@K#|A=a  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <+V-k|  
    hCallWnd[index]=NULL; To3^L_v"  
    HotKey[index]=0; WMW1B }Z3  
    HotKeyMask[index]=0; R<"2%oY  
    bRemoved=TRUE; 60xa?8<cg  
    KeyCount--; ZU=,f'bU  
    break; $aB /+,  
   } +"jl(5Q  
  } x>}B#  
 } + c`AE  
 return bRemoved; z8IPhE@  
} >xT^RYS  
F"!agc2!  
void VerifyWindow() !_qskDc-  
{ lK0s=4c{  
 for(int i=0;i<MAX_KEY;i++){ t5xb"F   
  if(hCallWnd!=NULL){ v2d<o[[C  
   if(!IsWindow(hCallWnd)){ !{;[xXK4M  
    hCallWnd=NULL; fV 3r|Bp  
    HotKey=0; `)T&~2n  
    HotKeyMask=0; 1Q]Rd  
    KeyCount--; tE@FvZC'=  
   } R,%_deV\(  
  } 7AFE-'S  
 } :Zza)>l  
} %;7.9%  
K}x_nW  
BOOL CHookApp::InitInstance() 62Mdm3  
{ @dl8(ILk'  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); %Uy%kN_&  
 hins=AfxGetInstanceHandle(); 'TL2%T/)t  
 InitHotkey(); C}q>YRubZ  
 return CWinApp::InitInstance(); ygN>"eP  
} r4u z} jl{  
F|Q H  
int CHookApp::ExitInstance() I.1D*!tz  
{ Y&K <{\vE  
 VerifyWindow(); <?YA,"~  
 UnInit(); 9t?L\  
 return CWinApp::ExitInstance(); &R,9+c  
} 1_uvoFLk  
tmO`|tn&  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file +TH3&H5I_A  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ?Nf 5w  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ GX  }q9  
#if _MSC_VER > 1000 /4*WDiH  
#pragma once #jBN?Z#  
#endif // _MSC_VER > 1000 =s;M]:  
4J5pXlzV  
class CCaptureDlg : public CDialog FbAW_Am(  
{ Mu{BUtkzG  
 // Construction g\Ak;03n  
 public: 9C/MRmv`  
  BOOL bTray; }$&xTW_  
  BOOL bRegistered; 6V1:qp/6  
  BOOL RegisterHotkey(); $e }n  
  UCHAR cKey; je%ldY]/@  
  UCHAR cMask; UX2lPgKdLz  
  void DeleteIcon(); hJ f2o  
  void AddIcon(); Ja|{1&J.  
  UINT nCount; px=]bALU  
  void SaveBmp(); 2/B)O)#ls  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 1oty*c  
  // Dialog Data xzm@ v(  
  //{{AFX_DATA(CCaptureDlg) wC`;f5->  
  enum { IDD = IDD_CAPTURE_DIALOG };  w_Uh  
  CComboBox m_Key; _fn1)  
  BOOL m_bControl;  @pFj9[N  
  BOOL m_bAlt; 71"+<C .  
  BOOL m_bShift; ]a?bzOr,  
  CString m_Path; e)@3m.  
  CString m_Number; j+kC-U;  
  //}}AFX_DATA 8md*wEjk  
  // ClassWizard generated virtual function overrides &^!h}D%T/  
  //{{AFX_VIRTUAL(CCaptureDlg) k_ Y~;P@  
 public: l +'F_a  
  virtual BOOL PreTranslateMessage(MSG* pMsg); xq[Yg15d%  
 protected: fPqr6OYz  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support wvN`R  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); <{Q'&T  
  //}}AFX_VIRTUAL c?E{fD"Fc3  
  // Implementation rjk( X|R*  
 protected: 0fArF*  
  HICON m_hIcon; o ehaQ#e  
  // Generated message map functions 1/;o  
  //{{AFX_MSG(CCaptureDlg) (dqCa[  
  virtual BOOL OnInitDialog(); =-#G8L%Q  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); MsOs{2 )2  
  afx_msg void OnPaint(); w5,Mb  
  afx_msg HCURSOR OnQueryDragIcon(); [sy j#  
  virtual void OnCancel(); 3^,QIG  
  afx_msg void OnAbout(); iPj~I  
  afx_msg void OnBrowse(); ^YlI>_3s  
  afx_msg void OnChange(); TQ ]dW  
 //}}AFX_MSG Z9K})47T  
 DECLARE_MESSAGE_MAP() gb" 4B%Hm  
}; DHw<%Z-J  
#endif Kz?#C  
s{}]D{bc  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file @Jn!0Y1_3  
#include "stdafx.h" 7TX2&kMoc  
#include "Capture.h" xZ.!d.rn  
#include "CaptureDlg.h" np9dM  
#include <windowsx.h> j:,9%tg  
#pragma comment(lib,"hook.lib") 91Z'  
#ifdef _DEBUG Vzg=@A#  
#define new DEBUG_NEW d`y!cu2}  
#undef THIS_FILE 5,)vJ,fs  
static char THIS_FILE[] = __FILE__; (xpn`NA  
#endif *O~e T  
#define IDM_SHELL WM_USER+1 lDU_YEQ>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Um` !%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W 7sn+g \  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [?0d~Q(R#  
class CAboutDlg : public CDialog cU.9}-)  
{ "i^ GmVn  
 public: eiVC"0-c}  
  CAboutDlg(); L|j%S  
  // Dialog Data 3=mr "&]r:  
  //{{AFX_DATA(CAboutDlg) 8LzBh_J?  
  enum { IDD = IDD_ABOUTBOX }; u<xo/=Z  
  //}}AFX_DATA =r2]uW9  
  // ClassWizard generated virtual function overrides I/6)3 su%  
  //{{AFX_VIRTUAL(CAboutDlg) N2C7[z+l`  
 protected: hz:pbes  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M@et6aud;K  
  //}}AFX_VIRTUAL L%"LlS g  
  // Implementation C[sh,  
 protected: 6gL-OJNo  
  //{{AFX_MSG(CAboutDlg) T{v>-xBRy  
  //}}AFX_MSG w_tJ7pz8T  
  DECLARE_MESSAGE_MAP() (Z] HX@"{J  
}; Kn`M4 O  
>l']H*&B<  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 4T6 {Y  
{ IxZb$h[  
 //{{AFX_DATA_INIT(CAboutDlg) V)ig)(CT  
 //}}AFX_DATA_INIT Y f@e=:  
} u\yVR$pQ  
Fh$slow4!  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) zi9[)YqxPH  
{ g4p  
 CDialog::DoDataExchange(pDX); ] }|byo  
 //{{AFX_DATA_MAP(CAboutDlg) SRIA*M.B}  
 //}}AFX_DATA_MAP ypOLp SYk  
} ^TY ;Zp  
"Jq8?FoT  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) (V`Md\NL`  
 //{{AFX_MSG_MAP(CAboutDlg) i%m"@7.kk  
 // No message handlers W,5Hx1z R  
 //}}AFX_MSG_MAP W !w,f;  
END_MESSAGE_MAP() s$ENFp7P  
EOj"V'!  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) "hxN!,DEZ  
: CDialog(CCaptureDlg::IDD, pParent) HBS\<}  
{ 4`m~FNVS   
 //{{AFX_DATA_INIT(CCaptureDlg) G 2bDf-1ew  
  m_bControl = FALSE; x!LQxoNF  
  m_bAlt = FALSE; t]jFo  
  m_bShift = FALSE; nfSbM3D]h  
  m_Path = _T("c:\\"); nn/?fIZN4  
  m_Number = _T("0 picture captured."); GPz(j'jU  
  nCount=0; H %JaZ?(  
  bRegistered=FALSE; K.<.cJE  
  bTray=FALSE; i 9<pqQ  
 //}}AFX_DATA_INIT Q_-_^J  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #'D" 'B  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 58\&/lYW  
} XR2~Q)@  
TxjYrzC  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) c #-U%qZ  
{ M>9-=$7  
 CDialog::DoDataExchange(pDX); fZ04!R  
 //{{AFX_DATA_MAP(CCaptureDlg) I-y#Ks1p+  
  DDX_Control(pDX, IDC_KEY, m_Key); KqBk~-G  
  DDX_Check(pDX, IDC_CONTROL, m_bControl);  McH>"`  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 9EDfd NN  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); L37Y+C//  
  DDX_Text(pDX, IDC_PATH, m_Path); {vUN+We  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ('wY9kvL&  
 //}}AFX_DATA_MAP &qp r*17T  
} 1tTg P+  
g VQjL+_W  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Nkxm m/Z  
//{{AFX_MSG_MAP(CCaptureDlg) 0"2=n.##  
 ON_WM_SYSCOMMAND() m(RXJORI  
 ON_WM_PAINT() Y}#h5\  
 ON_WM_QUERYDRAGICON() z%MW!x  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) r.3/F[.  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) j 8*ZF  
 ON_BN_CLICKED(ID_CHANGE, OnChange) mMsTyM-f  
//}}AFX_MSG_MAP t@u7RL*n:<  
END_MESSAGE_MAP() w(kf  
pyLRgD0 g  
BOOL CCaptureDlg::OnInitDialog() kB?al#`  
{ ]f+ csB  
 CDialog::OnInitDialog(); 5` Te \H  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); I2nF-JzD2a  
 ASSERT(IDM_ABOUTBOX < 0xF000); 3vcO!6Z5  
 CMenu* pSysMenu = GetSystemMenu(FALSE); t`*!w|}(1  
 if (pSysMenu != NULL) ~\{^%~[48  
 { mPI8_5V8]  
  CString strAboutMenu; 0/S_e)U  
  strAboutMenu.LoadString(IDS_ABOUTBOX); L}@c6fHG  
  if (!strAboutMenu.IsEmpty()) :RoBl3X=  
  { s! n<}C  
   pSysMenu->AppendMenu(MF_SEPARATOR); (WJ${OW  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ? A(QyaKz  
  } xX*H7#  
 } wP[t0/dl  
 SetIcon(m_hIcon, TRUE); // Set big icon !vG'J\*xc  
 SetIcon(m_hIcon, FALSE); // Set small icon XGP6L0j  
 m_Key.SetCurSel(0); 'cY` w  
 RegisterHotkey(); Y3Vlp/"rB"  
 CMenu* pMenu=GetSystemMenu(FALSE); $)3%U?AP  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); O@p]KSfk  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 311LC cRp  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); nX$XL=6mJ&  
 return TRUE; // return TRUE unless you set the focus to a control w"R:\@ F  
} D8 hr?:I9  
!rqF}d  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) /~x "wo  
{ EEGy!bff  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) f B9;_z  
 { KII *az  
  CAboutDlg dlgAbout; 6iCrRjY*  
  dlgAbout.DoModal(); B6wRg8  
 } y|'SXM  
 else J_s>N  
 { <.Nx[!'~&d  
  CDialog::OnSysCommand(nID, lParam); MEwo}=B  
 } &|/| ''A)  
} 0GJn_@hr  
3B1cb[2y  
void CCaptureDlg::OnPaint() ^^5&QSB:'  
{ 8 Y5  
 if (IsIconic()) **}h&k&%2  
 { ,3@#F/c3i~  
  CPaintDC dc(this); // device context for painting In`mtn q  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ]Kr `9r),  
  // Center icon in client rectangle 4~B> 9<$e>  
  int cxIcon = GetSystemMetrics(SM_CXICON); 6R=W}q4  
  int cyIcon = GetSystemMetrics(SM_CYICON); Q+YRf3$  
  CRect rect; 7b<yVP;{  
  GetClientRect(&rect); ULQMG'P^D  
  int x = (rect.Width() - cxIcon + 1) / 2; wE~V]bmtW  
  int y = (rect.Height() - cyIcon + 1) / 2; ;qrB\j"  
  // Draw the icon Dk?\)lD`  
  dc.DrawIcon(x, y, m_hIcon); 4'0Dr++  
 } qK)73eNSR  
 else DZi!aJ  
 { o865 (<p  
  CDialog::OnPaint(); D9z|VIw8  
 } r#XT3qp$d  
} ?M[ A7?  
;VWAf;U;B  
HCURSOR CCaptureDlg::OnQueryDragIcon() $sEy%-  
{ Uw 47LP  
 return (HCURSOR) m_hIcon; St e=&^  
} Y.*y9)#S6  
/iX+R@  
void CCaptureDlg::OnCancel() tg{H9tU;  
{ )oyIe)  
 if(bTray) *8LMn   
  DeleteIcon(); 7}X[ 4("bB  
  CDialog::OnCancel(); 3D2E?$dX  
} U~pV)J  
() j =5KDu  
void CCaptureDlg::OnAbout() )kP5u`v  
{ '_V2!?+RU+  
 CAboutDlg dlg; t^w"w`v\u  
 dlg.DoModal(); KN*  
} ^k9kJ+x^S2  
K"r*M.P>  
void CCaptureDlg::OnBrowse() 0(S"{Ov  
{ ?]*^xL;x?  
 CString str; &uO%_6J  
 BROWSEINFO bi; x@*SEa  
 char name[MAX_PATH]; M8tRjNWS?  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 1;{Rhu7* k  
 bi.hwndOwner=GetSafeHwnd(); vvm0t"|\  
 bi.pszDisplayName=name; sQ fFu  
 bi.lpszTitle="Select folder"; L31HG H2l  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; zRyuq1Zyc,  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); vMS |$L  
 if(idl==NULL) <kCU@SK  
  return; 3? HhG  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \Cii1\R=  
 str.ReleaseBuffer(); }5hqD BK?  
 m_Path=str; (2=Zm@Zp f  
 if(str.GetAt(str.GetLength()-1)!='\\') V>b\[(=s  
  m_Path+="\\"; ?:)]h c  
 UpdateData(FALSE); Xwhui4'w  
} -YCOP0  
7R`mf   
void CCaptureDlg::SaveBmp() Nd;K u6  
{ v61[.oS  
 CDC dc; ia MUsa{  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL);  Y*14v~\'  
 CBitmap bm; /K(o]J0F  
 int Width=GetSystemMetrics(SM_CXSCREEN); ^_f+15]D  
 int Height=GetSystemMetrics(SM_CYSCREEN); + ~>Aj  
 bm.CreateCompatibleBitmap(&dc,Width,Height); *FMMjz  
 CDC tdc; |6$p;Aar  
 tdc.CreateCompatibleDC(&dc); MgY0q?.S=  
 CBitmap*pOld=tdc.SelectObject(&bm); #*KNPh  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); og kD^   
 tdc.SelectObject(pOld); dUQ DO o  
 BITMAP btm; t{.8|d@  
 bm.GetBitmap(&btm); PF53mUs4  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; =W"F[fD  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); W' s  
 BITMAPINFOHEADER bih; !Ze5)g%H  
 bih.biBitCount=btm.bmBitsPixel; 4 XAQVq5  
 bih.biClrImportant=0; >Vwc3d  
 bih.biClrUsed=0; hK_LEwd;  
 bih.biCompression=0; <?@NRFTe  
 bih.biHeight=btm.bmHeight; 3h *!V6%q  
 bih.biPlanes=1; F 9@h|#an  
 bih.biSize=sizeof(BITMAPINFOHEADER); sn)3Z A  
 bih.biSizeImage=size; zaK#Z?V}  
 bih.biWidth=btm.bmWidth; {$wjO7Glp  
 bih.biXPelsPerMeter=0; urjjw.wZ  
 bih.biYPelsPerMeter=0; 0`[wpZ  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS);  m5r7  
 static int filecount=0; c\Q7"!e  
 CString name; SF>c\eTtx  
 name.Format("pict%04d.bmp",filecount++); c5u@pvSP  
 name=m_Path+name; i~{Ufi  
 BITMAPFILEHEADER bfh; Ac<Phy-J  
 bfh.bfReserved1=bfh.bfReserved2=0; LL3#5AA"k|  
 bfh.bfType=((WORD)('M'<< 8)|'B'); wwyPl  
 bfh.bfSize=54+size; ~W{2Jd  
 bfh.bfOffBits=54; hBBUw0"  
 CFile bf; 6,0_)O}\b  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ K~| 4[\  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); L{8xlx`  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); E6pMT^{K  
  bf.WriteHuge(lpData,size); 9T*v9d  
  bf.Close(); FSA1gAW6g  
  nCount++; iLkZ"X.'|1  
 } %|^fi8!:|  
 GlobalFreePtr(lpData); Qx+%"YO  
 if(nCount==1) [x,>?~6ek  
  m_Number.Format("%d picture captured.",nCount); 4x 8)gE   
 else =fO5cA6Z  
  m_Number.Format("%d pictures captured.",nCount); !lj| cT9  
  UpdateData(FALSE); <1t*I!e_  
} FW21 U<  
}n4V|f-  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) #~<0t(3Q  
{ #g]vc_V  
 if(pMsg -> message == WM_KEYDOWN) 3U7 *>H  
 { T>NDSami  
  if(pMsg -> wParam == VK_ESCAPE) j 4^97  
   return TRUE; !;KCU^9  
  if(pMsg -> wParam == VK_RETURN) ;,?KI$K  
   return TRUE; 5) pj]S!]-  
 } _t^{a]/H  
 return CDialog::PreTranslateMessage(pMsg); j4cwI90=  
} &2{ tF  
0sfr d  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Yi$vg  
{ BZ?.D_bu  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ # ?/<  
  SaveBmp(); ' <@3i[M  
  return FALSE; SUU !7Yd|  
} Z|lq b=  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ |bO"_U  
 CMenu pop; f)^_|8  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ~wkj&yVT  
 CMenu*pMenu=pop.GetSubMenu(0); Ljp%CI[i  
 pMenu->SetDefaultItem(ID_EXITICON); K|:@Z  
 CPoint pt; j,"@?Wt7  
 GetCursorPos(&pt); !'cl"\h  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); pUV/ Ul]  
 if(id==ID_EXITICON) K*X_FJ  
  DeleteIcon(); P_Gw-`L5T  
 else if(id==ID_EXIT) (q(~de  
  OnCancel(); *%S"eWb  
 return FALSE; d~JKH&x<  
} i;_tI#:A  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); MM x9(`t*.  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) PqiB\~o@Z  
 AddIcon(); T^Ze3L]  
 return res; 9Ru8~R/\  
} B4i!/@0s  
8[E!E)4M  
void CCaptureDlg::AddIcon() 3%%o?8ES  
{ J /f  
 NOTIFYICONDATA data; JNJ=e,O,  
 data.cbSize=sizeof(NOTIFYICONDATA); e-"nB]n^/  
 CString tip; H?)w!QX  
 tip.LoadString(IDS_ICONTIP); UHTvCc  
 data.hIcon=GetIcon(0); fngOeLVG  
 data.hWnd=GetSafeHwnd(); 5a hVeY  
 strcpy(data.szTip,tip); 4<lRPsvgc  
 data.uCallbackMessage=IDM_SHELL; Wb?8j M  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; [Z}9>~m  
 data.uID=98; $D|e>U  
 Shell_NotifyIcon(NIM_ADD,&data); T<55a6NoK  
 ShowWindow(SW_HIDE); ,^eYlmT>6  
 bTray=TRUE; >JC  
} {ZI)nQ{  
^]W<X"H+Z  
void CCaptureDlg::DeleteIcon() {6_|/KE9_  
{ SBIj<Yy]  
 NOTIFYICONDATA data; Zw ^kmSL"  
 data.cbSize=sizeof(NOTIFYICONDATA); !AKg m'Nw  
 data.hWnd=GetSafeHwnd(); 3G`aHTWk  
 data.uID=98; z6w3"9Um  
 Shell_NotifyIcon(NIM_DELETE,&data); ).sRv6/c  
 ShowWindow(SW_SHOW); lna}@]oR  
 SetForegroundWindow(); =A!@6Nw  
 ShowWindow(SW_SHOWNORMAL); .`4{9?bR  
 bTray=FALSE; g!+| I  
} bqnNLs<N  
"hzB9*"t  
void CCaptureDlg::OnChange() /#VhkC _  
{ t\%HX.8[;%  
 RegisterHotkey(); S'_-G;g.  
} }}>q2y  
8p@Piy{p  
BOOL CCaptureDlg::RegisterHotkey() [`c^ 4 E  
{ zY"1drE>G  
 UpdateData(); /qy-qUh3h  
 UCHAR mask=0; pJt,9e6  
 UCHAR key=0; JSTuXW  
 if(m_bControl) .2v_H5<  
  mask|=4; y6[IfcN  
 if(m_bAlt) "F.;Dv9V[0  
  mask|=2; .R./0Ot tx  
 if(m_bShift) v,4pp@8rv  
  mask|=1; < F`>,Pm  
  key=Key_Table[m_Key.GetCurSel()]; G}:lzOlMH  
 if(bRegistered){ m6[0Kws&  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Od %"B\  
  bRegistered=FALSE; [N#, K02mk  
 } 49dd5ddr  
 cMask=mask; b#hDHSdZ,  
 cKey=key; lMg+R<$~I  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); i5K[>5  
 return bRegistered; :=\Hoz  
} E~gyy]8&  
f,:9N5Z  
  四、小结 VI'hb'2  
& '}/f5s|  
  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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