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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: Pm2T!0  
  X6+2~'*t  
  一、实现方法 I%.96V  
7MRu=Z.-b  
  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: Gi7jgv{{  
9ghZL Q  
#pragma data_seg("shareddata") ttazY#  
HHOOK hHook =NULL; //钩子句柄 ~]+-<O^U~  
UINT nHookCount =0; //挂接的程序数目 }LXS!Ff:  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 3=6`'PKRQ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 I) mP ?  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey N|Cx";,|FZ  
static int KeyCount =0; <AZ21"oR/  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 G#V}9l8 Q  
#pragma data_seg() XkB^.[B  
'dE G\?v9  
  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。 q+A^JjzT  
?vHow$  
  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: q4].C|7   
tTWeOAF  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ya!RiHj  
cKey,UCHAR cMask) %Pr P CT  
{ s[ {L.9Y  
 BOOL bAdded=FALSE; mI55vNyer  
 for(int index=0;index<MAX_KEY;index++){ ?{bF3Mz=  
  if(hCallWnd[index]==0){ ( K5w0  
   hCallWnd[index]=hWnd; I\NiA>c  
   HotKey[index]=cKey; v&BKl  
   HotKeyMask[index]=cMask; gv&%2e}_  
   bAdded=TRUE; nZ;h&N -_-  
   KeyCount++; pEUbP,3M:  
   break; .'3&!#3  
  } JNQiCK,)}M  
 } l `D>h2]  
 return bAdded; [kdt]+'+  
} \ (y6o}aW  
//删除热键 #+mt}w/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w28!Yj1Q  
{ NGl/F{<  
 BOOL bRemoved=FALSE; TW 2OT }  
 for(int index=0;index<MAX_KEY;index++){ fz%I'+!  
  if(hCallWnd[index]==hWnd){ E)eRi"a46  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ '4gi*8Y  
    hCallWnd[index]=NULL; YkRv~bc1]  
    HotKey[index]=0; ]B;GU  
    HotKeyMask[index]=0; dXAKk[uf  
    bRemoved=TRUE; BMw_F)hTO  
    KeyCount--; T[mo PD5  
    break; !PN;XZ~{  
   } *?/9lAm  
  } ^i3~i?\,P  
 } K".\QF,:  
 return bRemoved; GF6c6TXF@  
} 2?3D` `  
;^5d^-T  
yNY *Fl!  
  DLL中的钩子函数如下: GA19=gow  
bM]\mo>z<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @(XX68  
{  &Gp~)%  
 BOOL bProcessed=FALSE; x+j5vzhG)  
 if(HC_ACTION==nCode) W"9?D  
 { !V~`e9[rl  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 al/3$0#U  
   switch(wParam) {}Y QB'}  
   {  SHw%u~[hu  
    case VK_MENU: >>lT-w  
     MaskBits&=~ALTBIT; hg}Rh  
     break; :e-&,K  
    case VK_CONTROL: EleK*l  
     MaskBits&=~CTRLBIT; <ex,@{n4  
     break; 1:-^*  
    case VK_SHIFT: __U;fH{c  
     MaskBits&=~SHIFTBIT; F$ kLft[:  
     break; TGnyN'P|  
    default: //judge the key and send message #q{i<E 07  
     break; Dp:u!tdbeg  
   } =}S*]Me5  
   for(int index=0;index<MAX_KEY;index++){ *ey<R  
    if(hCallWnd[index]==NULL) >n,RBl  
     continue; 5#~ARk*?a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) SB#YV   
    { 0- GA,I_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); PV?XpT  
     bProcessed=TRUE; {I s?>m4  
    } v:s.V>{"S  
   } QcyYTg4i  
  } xk}(u`:.  
  else if((lParam&0xc000ffff)==1){ //有键按下 xNG 'UbU  
   switch(wParam) ".&x`C  
   { vkE[Ur>  
    case VK_MENU: 3zJbb3e  
     MaskBits|=ALTBIT; ZN)a}\]  
     break; r>+Hwj0>  
    case VK_CONTROL: O=os ,'"  
     MaskBits|=CTRLBIT; vF, !8e'v  
     break; ?#@JH  
    case VK_SHIFT: D:Zpls.  
     MaskBits|=SHIFTBIT; TGxspmY6  
     break; ^H'zS3S  
    default: //judge the key and send message Ro+/=*ql~  
     break; |]7z  
   } VFN\ Ryd  
   for(int index=0;index<MAX_KEY;index++){ `r"euO r\  
    if(hCallWnd[index]==NULL) 846j<fE  
     continue; cnAwoTt4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'U<-w$!f+^  
    { {;4AdZk  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ^FSUK  
     bProcessed=TRUE; ]JQk,<l5E  
    } Zf<M14iM  
   } wAE ,mw  
  } y6KI.LWR9  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 tN|sHgs  
   for(int index=0;index<MAX_KEY;index++){ Y$3H$F.+  
    if(hCallWnd[index]==NULL) mq$mB1$3u  
     continue; CFJ F}aW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) zn5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); x1)G!i  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 O`e0r%SJ  
   } DJ"O`qNV3  
  } t?^C9(;6  
 } >'#G$f  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $rf4h]&<  
} WXj}gL`  
}?B=R#5  
  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: \nV|Y=5  
t5h]]TOz  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ['pk/h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X<s']C9c  
2-821Sf#h  
  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: \(_FGa4j  
<Vp7G%"'W  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) jqHg'Fq  
{ X#mm Z;P  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Z(AI]wk3<  
 { 11}fPWK  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 .?b2Bd!MC  
  SaveBmp(); Oqzz9+  
  return FALSE; ~o`I[-g)  
 } -ecP@,  
 …… //其它处理及默认处理 6L~@jg~0A[  
} \RZFq<6>  
\ief [  
*&)<'6  
  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。 d,au&WZ;_  
(x9d7$2  
  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。 $NP5Z0v7  
 D/hQ{T  
  二、编程步骤 za7h.yK}  
IWN:GFH(  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 42LlR 0  
VAf~,T]Ww  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; l)E \mo 8  
bL 5z%bV  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Sv.z9@S  
:bMCmY  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; "iE9X.6NMu  
*&B1(&{:V  
  5、 添加代码,编译运行程序。 tYyva  
2X2,( D!  
三、程序代码 GP ;c$pC  
\s Fdp!M}2  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL QLo^6S5!  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) W5*%n]s~  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ kNfqdCF{P  
#if _MSC_VER > 1000 k{n*[)m  
#pragma once pRmnS;*z&  
#endif // _MSC_VER > 1000 Lys4l$J]  
#ifndef __AFXWIN_H__ ~,yHE3B\G  
#error include 'stdafx.h' before including this file for PCH MrjET!`.jC  
#endif 9z 5K  -s  
#include "resource.h" // main symbols $DW3H1iW  
class CHookApp : public CWinApp YMP:T?vMVh  
{ ^a|$z$spf  
 public: /_E:sI9(  
  CHookApp(); $enh>!mU  
  // Overrides u4B,|_MK  
  // ClassWizard generated virtual function overrides *!UY;InanX  
  //{{AFX_VIRTUAL(CHookApp) 48M)A  
 public: xI'<4lo7Z  
  virtual BOOL InitInstance(); \/4ipU.  
  virtual int ExitInstance(); &|P@$O>  
  //}}AFX_VIRTUAL N]: "3?%  
  //{{AFX_MSG(CHookApp) v,r}q1.E}  
  // NOTE - the ClassWizard will add and remove member functions here. xEaRuH c  
  // DO NOT EDIT what you see in these blocks of generated code ! ke|v|@  
  //}}AFX_MSG 94%gg0azp  
  DECLARE_MESSAGE_MAP() j~V@0z.  
}; w.J[3m/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); (utm+*V,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *w4jET>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,.tT9? m  
BOOL InitHotkey(); EDvK9J  
BOOL UnInit(); &$  F0  
#endif ayyn6a8  
A|tee@H*0  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. "xZ]i)  
#include "stdafx.h" $*K5  
#include "hook.h" vP&dvAUF  
#include <windowsx.h> |x["fWK  
#ifdef _DEBUG =<(:5ive  
#define new DEBUG_NEW 8):I< }s#  
#undef THIS_FILE vJ>A >R CB  
static char THIS_FILE[] = __FILE__; Ken|!rL  
#endif FCQoz"M  
#define MAX_KEY 100 W^0F(9~!(  
#define CTRLBIT 0x04 m_~ p G  
#define ALTBIT 0x02 XEV-D9n  
#define SHIFTBIT 0x01 l?(nkg["nY  
#pragma data_seg("shareddata") W5(t+$L.  
HHOOK hHook =NULL; y4) M,+O5  
UINT nHookCount =0; />q=qkdq0  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey :w(J=0Lt  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT mp0p#8txi  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey +] B  
static int KeyCount =0; *wP8)yv7  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift +FQ:Q+  
#pragma data_seg() #})Oz| c  
HINSTANCE hins; $-"AMZ899  
void VerifyWindow(); g}IdU;X$NT  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 8+ eZU<\B(  
//{{AFX_MSG_MAP(CHookApp) y?<[g;MuT  
// NOTE - the ClassWizard will add and remove mapping macros here. VgZ<T,SuW  
// DO NOT EDIT what you see in these blocks of generated code! Gk,{{:M:5  
//}}AFX_MSG_MAP MLY19;e  
END_MESSAGE_MAP() >1a- }>r  
Vj4 if@Z  
CHookApp::CHookApp() $/],QD_;"  
{ wQ!~c2a<8  
 // TODO: add construction code here, ~w Dmt  
 // Place all significant initialization in InitInstance |K'{R'A  
} %cO;{og M  
m(nlu  
CHookApp theApp; x@2rfs  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)  ?1r@r  
{ 7GfgW02  
 BOOL bProcessed=FALSE;  wxsJB2  
 if(HC_ACTION==nCode) twt Bt L  
 { lf0/ 0KH  
  if((lParam&0xc0000000)==0xc0000000){// Key up Vv' e,m  
   switch(wParam) MTb}um.($  
   { n0U^gsD4J  
    case VK_MENU: 9~zh]deH  
     MaskBits&=~ALTBIT; Zqd&EOm  
     break; q?8MKf[N  
    case VK_CONTROL: =b32E^z,  
     MaskBits&=~CTRLBIT; y4VCehdJ  
     break; D[ 7K2G+  
    case VK_SHIFT: @S?.`o  
     MaskBits&=~SHIFTBIT; ' F`*(\#  
     break; 84 b;G4K  
    default: //judge the key and send message 3{Ze>yFE  
     break; OnH>g"  
   } Y::fcMJr;Q  
   for(int index=0;index<MAX_KEY;index++){ o}v # Df  
    if(hCallWnd[index]==NULL) \q Q5x  
     continue; KU-z;}9s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A/{pG#if]3  
    { XZcsx  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u A C:&  
     bProcessed=TRUE; h\'GL(?DBI  
    } Yp 6;Y7^  
   } qt/syF&s  
  } pPo?5s  
  else if((lParam&0xc000ffff)==1){ //Key down 'e3y|  
   switch(wParam) u>& \@?(  
   { 8)5 n  
    case VK_MENU: l4U& CA y  
     MaskBits|=ALTBIT; $2]1 3j  
     break; MGc=TQ.  
    case VK_CONTROL: @EfCNOy  
     MaskBits|=CTRLBIT; #H O\I7m  
     break; z(.$>O&6H  
    case VK_SHIFT: z$ysp!  
     MaskBits|=SHIFTBIT; KyXgw  
     break; @E O #Ms  
    default: //judge the key and send message 1a_;[.s  
     break; 7b+OIZB  
   } H!F'I)1  
   for(int index=0;index<MAX_KEY;index++) )FWF T:P~  
   { dadOjl)S)  
    if(hCallWnd[index]==NULL) aU^>kRGc  
     continue; /T#<g:   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) x)"=*Jj  
    { 6i.'S5.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); YtW#MG$f  
     bProcessed=TRUE; @kvp2P+O  
    } ez(4TtT  
   } 6;n^/3*#  
  } L!S-f4^5  
  if(!bProcessed){ yel>-=Vn  
   for(int index=0;index<MAX_KEY;index++){ CSr{MF`]e  
    if(hCallWnd[index]==NULL) (ZShhy8g  
     continue; pal))e! B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) FVY,CeA.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); WU<#_by g  
   } H7Y}qP5X  
  } C| Mh<,~ E  
 } +V2a|uvEc  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); rA` zuYo  
} LvWU %?  
>=U $s@  
BOOL InitHotkey() QMtt:f]?i  
{ {)b`fq  
 if(hHook!=NULL){ `yQHPN0/  
  nHookCount++; LWVO%@)w  
  return TRUE; wW%I < M  
 } `W]a @\EYA  
 else iS=T/<|?  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 30DpIkf  
  if(hHook!=NULL) /;OJ=x3i  
   nHookCount++; EHzZ9zH\  
  return (hHook!=NULL); '/sc `(`:0  
} m9L+|r  
BOOL UnInit() EAY9~b6~c  
{ lg8~`96  
 if(nHookCount>1){ 3M%EK2,  
  nHookCount--; _KZ(Yq>SdY  
  return TRUE; *r-Bt1  
 } } \823 U %  
 BOOL unhooked = UnhookWindowsHookEx(hHook); +B8Ut{l  
 if(unhooked==TRUE){ vnN_csJ#^  
  nHookCount=0; UD9h5PgT  
  hHook=NULL; $35Oyd3s<  
 } e. [+xOu`  
 return unhooked; b%oma{I=.c  
} etTuukq_Z  
1c}'o*K_%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) nn=JM7e\9  
{ 20fCWVw}?}  
 BOOL bAdded=FALSE; fLD9RZ8_  
 for(int index=0;index<MAX_KEY;index++){ _eO]awsA  
  if(hCallWnd[index]==0){ iGhapD  
   hCallWnd[index]=hWnd; whLske-  
   HotKey[index]=cKey; qh2.N}lW  
   HotKeyMask[index]=cMask; Ey6K@@%  
   bAdded=TRUE; %1=W#jz  
   KeyCount++; 2X*epU_1h  
   break; yBl<E$=  
  } 8vT:icl  
 } 2sU"p5 j  
 return bAdded; BKD Wd]KEf  
} 4U6{E#  
RtIc:ym  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9723f1&Vd  
{ /ZzlC#`  
 BOOL bRemoved=FALSE; F;b|A`M  
 for(int index=0;index<MAX_KEY;index++){ ;zCHEz  
  if(hCallWnd[index]==hWnd){ Y4{`?UM&h  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #zy%B  
    hCallWnd[index]=NULL; 0)P18n"$  
    HotKey[index]=0; C$tSsw?A  
    HotKeyMask[index]=0; ':>B %k  
    bRemoved=TRUE; hCDI;'ls  
    KeyCount--; YLCwo]\+>  
    break; 7q\c\qL  
   } NNfCJ|  
  } nuCK7X  
 } \O0fo^+U,,  
 return bRemoved; r[,KE.^6~#  
} @"~\[z5  
G` 8j ^H,  
void VerifyWindow() lyi}q"Kn*;  
{ !e7vc[N  
 for(int i=0;i<MAX_KEY;i++){ )a}5\V  
  if(hCallWnd!=NULL){ )R|7> 97  
   if(!IsWindow(hCallWnd)){ a>kD G <.A  
    hCallWnd=NULL; i]YQq!B  
    HotKey=0; n-=\n6"P  
    HotKeyMask=0; $bo^UYZ6  
    KeyCount--; /F4:1 }  
   } $?s^HKF~  
  } $` oA$E3  
 } srSTQ\l4  
} T9$U./69-L  
<VBw1|)$@  
BOOL CHookApp::InitInstance() :1{j&$  
{ $YC~02{  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ;CvGIp&y  
 hins=AfxGetInstanceHandle(); ~H$XSNPi  
 InitHotkey(); p']AXJ`Z  
 return CWinApp::InitInstance(); ]S:@=9JB'  
} H|!s.  
j~{2fd<>  
int CHookApp::ExitInstance() i f"v4PHq  
{ a2 SQ:d  
 VerifyWindow(); 68)^i"DM<  
 UnInit(); l6 WcnJ  
 return CWinApp::ExitInstance(); {L=[1  
} P~ykC{nD  
<-?B#  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 9s!/yiP5  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 4sAshrUf  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ |")x1' M  
#if _MSC_VER > 1000 `u}x:f !  
#pragma once \1Bgs^  
#endif // _MSC_VER > 1000 $W?XxgkB?  
nx4aGS"F:  
class CCaptureDlg : public CDialog \fhT#/0N  
{ S?{5DxilO  
 // Construction ep?0@5D}]  
 public: '-vy Q^  
  BOOL bTray; n~ql]Ln  
  BOOL bRegistered; [v`4OQF/  
  BOOL RegisterHotkey(); \1!k)PZdTW  
  UCHAR cKey; ;1dz?'%V  
  UCHAR cMask; /'1y`j<  
  void DeleteIcon(); |W <:rT  
  void AddIcon(); /Ow?nWSt  
  UINT nCount; k$c j|-<  
  void SaveBmp(); gctaarB&  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Cm4 *sN.&)  
  // Dialog Data A1q^E(}O  
  //{{AFX_DATA(CCaptureDlg) P&GZe/6Y  
  enum { IDD = IDD_CAPTURE_DIALOG }; p4t)Z#0  
  CComboBox m_Key; sfV.X:ev  
  BOOL m_bControl; =l(JJ  
  BOOL m_bAlt; m@@QT<  
  BOOL m_bShift; HFr3(gNj@  
  CString m_Path; Wy4^mOv  
  CString m_Number; A|J\X=5  
  //}}AFX_DATA OGFKc#  
  // ClassWizard generated virtual function overrides !.9vW&t  
  //{{AFX_VIRTUAL(CCaptureDlg) =F&RQ}$   
 public: [*G2wP[$  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 2UF94  
 protected: mc'p-orAf  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @"!SU' *  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); q(7D8xG;F  
  //}}AFX_VIRTUAL 5avO48;Vc  
  // Implementation u\xm8}A  
 protected: `$H   
  HICON m_hIcon; !`_f\  
  // Generated message map functions =dBrmMh  
  //{{AFX_MSG(CCaptureDlg) HWhKX:`l  
  virtual BOOL OnInitDialog(); [S:)UvB  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); {*U:Wm<  
  afx_msg void OnPaint(); e{;e   
  afx_msg HCURSOR OnQueryDragIcon(); $at|1+bQ  
  virtual void OnCancel(); udFju&!W  
  afx_msg void OnAbout(); pG @iR*?  
  afx_msg void OnBrowse(); qfu2}qUX~%  
  afx_msg void OnChange(); p]&Q`oh  
 //}}AFX_MSG CK(ev*@\D,  
 DECLARE_MESSAGE_MAP() 2[po~}2-0  
}; _|ib@Xbin  
#endif kDq%Y[6Z  
W~3tQ!  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file l;A_Aii(  
#include "stdafx.h" n*~   
#include "Capture.h" }yw;L(3  
#include "CaptureDlg.h" *]WXM.R8  
#include <windowsx.h> 5V~p@vCx  
#pragma comment(lib,"hook.lib") <y!r~?  
#ifdef _DEBUG UwkX[u  
#define new DEBUG_NEW 0@lC5-=  
#undef THIS_FILE &|}IBu:T  
static char THIS_FILE[] = __FILE__; L_"(A #H:  
#endif T''+zk  
#define IDM_SHELL WM_USER+1 Ts .Z l{B  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); j7#GqVS'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); i@5%d!J  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; c)MR+'d\WO  
class CAboutDlg : public CDialog ]Cn*C{  
{ [IFRwQ^%_O  
 public: ;Ia1L{472m  
  CAboutDlg(); jHH  
  // Dialog Data O/9%"m:i  
  //{{AFX_DATA(CAboutDlg) WG !t!1p  
  enum { IDD = IDD_ABOUTBOX }; rs Uw(K^  
  //}}AFX_DATA @z)tC@  
  // ClassWizard generated virtual function overrides JjLyV`DJ  
  //{{AFX_VIRTUAL(CAboutDlg) > x ghq  
 protected: PbUcbb17  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support :ZS 8Zm"  
  //}}AFX_VIRTUAL sLdUrD%  
  // Implementation 3C=clB9<  
 protected: Ln2C#Uf  
  //{{AFX_MSG(CAboutDlg) t* vg]Yc  
  //}}AFX_MSG Sn2Ds)Pfx3  
  DECLARE_MESSAGE_MAP() qMES<UL>  
}; gH^$Y~Lx  
xeM':hD.o  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) IXvz&4VD  
{ =8p+-8M[d  
 //{{AFX_DATA_INIT(CAboutDlg) ASZ5;N4u  
 //}}AFX_DATA_INIT KM}4^Qc  
} ef}E.Bl  
3 9{"T0  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) eM=)>zl  
{ lzs(i 2pA  
 CDialog::DoDataExchange(pDX); *rcuhw"^b#  
 //{{AFX_DATA_MAP(CAboutDlg) 8@yc}~8 *  
 //}}AFX_DATA_MAP LQ\ ELJj  
} VnSj:LUD  
4Sstg57x~  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) (GEi<\16[  
 //{{AFX_MSG_MAP(CAboutDlg) (1AA;)`Kp  
 // No message handlers Di<J6xu  
 //}}AFX_MSG_MAP `JWYPsWk  
END_MESSAGE_MAP() ]~00=nXFM/  
w<~<(5mM5;  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) }SMJD  
: CDialog(CCaptureDlg::IDD, pParent) cbCE $  
{ NQ!N"C3u  
 //{{AFX_DATA_INIT(CCaptureDlg) E`uaE=Mdq  
  m_bControl = FALSE; %Mng8r  
  m_bAlt = FALSE; @y0bU*v7  
  m_bShift = FALSE; E[3FdX8  
  m_Path = _T("c:\\"); Mj B< \g>  
  m_Number = _T("0 picture captured."); )n}]]^Sc  
  nCount=0; 4ZJT[zi  
  bRegistered=FALSE; U++~3e@l  
  bTray=FALSE; r` `i C5Ii  
 //}}AFX_DATA_INIT AqbT{,3yW  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 c > mu)('U  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); frmqBCVJ:  
} {8#N7(%z  
cxD}t'T  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Stw+Dm\!  
{ ok3  
 CDialog::DoDataExchange(pDX); a|P~LMPM  
 //{{AFX_DATA_MAP(CCaptureDlg) YKe0:cWc  
  DDX_Control(pDX, IDC_KEY, m_Key); $}^\=p}X  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 5&HT$"H :  
  DDX_Check(pDX, IDC_ALT, m_bAlt); &AQ;ze  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 9IvcKzS2  
  DDX_Text(pDX, IDC_PATH, m_Path); RZd4(7H=q  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 7"n1it[RJ8  
 //}}AFX_DATA_MAP Lk`k>Nn)  
} NT;x1  
O~#uQm  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) lv00sa2z  
//{{AFX_MSG_MAP(CCaptureDlg) F8S~wW=\w  
 ON_WM_SYSCOMMAND() ,dZ#,<  
 ON_WM_PAINT() ^%oG8z,L  
 ON_WM_QUERYDRAGICON() LZQFj/,Jg  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) +f\pk \Ith  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) (I7&8$Zl  
 ON_BN_CLICKED(ID_CHANGE, OnChange) DO1 JPeIi  
//}}AFX_MSG_MAP xMSNrOc  
END_MESSAGE_MAP() yL ;o{ G  
V5yxQb  
BOOL CCaptureDlg::OnInitDialog() vfJ3idvo*w  
{ tB,.  
 CDialog::OnInitDialog(); g]Xzio&w  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 68p\WheCal  
 ASSERT(IDM_ABOUTBOX < 0xF000);  Qh|-a@  
 CMenu* pSysMenu = GetSystemMenu(FALSE); yZ;k@t_WRD  
 if (pSysMenu != NULL) `rz`3:ZH  
 { CRc!|?  
  CString strAboutMenu; xH"W}-#[  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?GUz?'d  
  if (!strAboutMenu.IsEmpty()) Ez/\bE  
  { A]Q1&qM%  
   pSysMenu->AppendMenu(MF_SEPARATOR); mEB2RLCM  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); .*EOVo9S  
  } =j|v0& AGC  
 } 1H&?UP4=(  
 SetIcon(m_hIcon, TRUE); // Set big icon `z-H]fU  
 SetIcon(m_hIcon, FALSE); // Set small icon P~Te+ -jX}  
 m_Key.SetCurSel(0);  NVO9XK  
 RegisterHotkey(); Jt-X mGULB  
 CMenu* pMenu=GetSystemMenu(FALSE); [GR]!\!%~  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ]cF1c90%  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); <\1}@?NGC  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Y7*(_P3/  
 return TRUE; // return TRUE unless you set the focus to a control 6(N.T+;]  
} Gd30Be2gd  
#1QX!dK+  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) C.yY8?|  
{ 9UeVvH  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) "pSH!0Ap\  
 { r@*=|0(OrK  
  CAboutDlg dlgAbout; ,J~,ga~  
  dlgAbout.DoModal(); $6:XsrV\a  
 } wJ80};!  
 else !j!Z%]7  
 { e9~cBG|  
  CDialog::OnSysCommand(nID, lParam); ~K5Cr  
 } r{K\(UT]!  
} Bs+c2R  
v>#Cg \  
void CCaptureDlg::OnPaint() F=oHl@  
{ [2GXAvXsT  
 if (IsIconic()) M1AZ}b c0]  
 { :DZLjC  
  CPaintDC dc(this); // device context for painting ,}9f(`  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); G 2%  
  // Center icon in client rectangle [;(]Jy  
  int cxIcon = GetSystemMetrics(SM_CXICON); tA`mD>[  
  int cyIcon = GetSystemMetrics(SM_CYICON); *.kj]BoO  
  CRect rect; P]pmt1a  
  GetClientRect(&rect); O" % Hprx  
  int x = (rect.Width() - cxIcon + 1) / 2; E$]a?uA:  
  int y = (rect.Height() - cyIcon + 1) / 2; m >]>$=%  
  // Draw the icon eaV3) uP  
  dc.DrawIcon(x, y, m_hIcon); Dk)@>l:gI,  
 } `fQM  
 else `t{D7I7  
 { {E!$ xY8  
  CDialog::OnPaint(); )8pc f`h{  
 } uk`T+@K  
} zc6H o  
!"g=&Uy&  
HCURSOR CCaptureDlg::OnQueryDragIcon() (bg}an  
{ i Td-n9  
 return (HCURSOR) m_hIcon; L7SEswMti  
} KK:N [x  
u$W Bc\ j  
void CCaptureDlg::OnCancel() CnabD{uTf  
{ oJP< 'l1  
 if(bTray) rs[?v*R74  
  DeleteIcon(); >j&1?M2C  
  CDialog::OnCancel(); "Jb3&qdU  
} LWD.  
E9^(0\Z I  
void CCaptureDlg::OnAbout() ^ [ET&"  
{ ;LHDh_.pX  
 CAboutDlg dlg; j h; 9 [  
 dlg.DoModal(); iPMB$SdfO  
} ,+~2&>wj  
@Ppo &>  
void CCaptureDlg::OnBrowse() N g58/}zO  
{ O x{Q.l  
 CString str; |kId8WtA  
 BROWSEINFO bi; q#;BhPc  
 char name[MAX_PATH]; m'd^?Qc  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ;xL67e%?  
 bi.hwndOwner=GetSafeHwnd(); h]qT1( I  
 bi.pszDisplayName=name; GA.BI"l  
 bi.lpszTitle="Select folder"; SV&kWbS  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; !d\t:0;  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ,,S9$@R  
 if(idl==NULL) K6E}";;  
  return; <#>Oy&E  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "cwR^DoD&  
 str.ReleaseBuffer(); f:xUPH?+  
 m_Path=str; [1NaH  
 if(str.GetAt(str.GetLength()-1)!='\\') i#k-)N _$  
  m_Path+="\\"; u0xQ;BQ  
 UpdateData(FALSE); *]5z^> q;7  
} *%3oyWwCd  
x7f:F.  
void CCaptureDlg::SaveBmp() !;i*\ a  
{ 5!~!j "q  
 CDC dc; FS8S68  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 6{Ks`Af  
 CBitmap bm; +Z ><  
 int Width=GetSystemMetrics(SM_CXSCREEN); Gi*<~`Gr  
 int Height=GetSystemMetrics(SM_CYSCREEN); P2On k l  
 bm.CreateCompatibleBitmap(&dc,Width,Height); kg:l:C)Tq  
 CDC tdc; Te+^J8  
 tdc.CreateCompatibleDC(&dc); 9GThyY  
 CBitmap*pOld=tdc.SelectObject(&bm); 0Su_#".-*  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); N3Z iGD  
 tdc.SelectObject(pOld); [6_"^jgH  
 BITMAP btm; Y:wF5pp;  
 bm.GetBitmap(&btm); !#.\QU|  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; sv' Gt1&"Z  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); i!L;? `F{  
 BITMAPINFOHEADER bih; uMHRUi  
 bih.biBitCount=btm.bmBitsPixel; :.DI_XN`  
 bih.biClrImportant=0; d4J<,  
 bih.biClrUsed=0; tR<L`?4  
 bih.biCompression=0; |-n ('gQ[  
 bih.biHeight=btm.bmHeight; e[}],W  
 bih.biPlanes=1; t~ -J %$  
 bih.biSize=sizeof(BITMAPINFOHEADER); y5_XHi@u~o  
 bih.biSizeImage=size; E[UO5X  
 bih.biWidth=btm.bmWidth; u^l*5F%DK  
 bih.biXPelsPerMeter=0; 7gm:ZS   
 bih.biYPelsPerMeter=0; <9`?Z-lJP  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _e*c  
 static int filecount=0; mY`@'  
 CString name; 3q"7K  
 name.Format("pict%04d.bmp",filecount++); SBX|Bcyk*  
 name=m_Path+name; Yc d3QRB  
 BITMAPFILEHEADER bfh; rhIGOk1k  
 bfh.bfReserved1=bfh.bfReserved2=0; ]/_G-2.R  
 bfh.bfType=((WORD)('M'<< 8)|'B'); iOll WkF  
 bfh.bfSize=54+size; [%jxf\9jJ_  
 bfh.bfOffBits=54; FOSbe]  
 CFile bf; ) o xIzF  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ kQ~ %=pn  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER));  |# V(p^  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ge$LIsE8  
  bf.WriteHuge(lpData,size); (`pNXQ0n  
  bf.Close(); Q<yAT(w  
  nCount++; *2=W5LaK.  
 } ) \ 4 |  
 GlobalFreePtr(lpData); jXWNHIl)@  
 if(nCount==1) _W|R;Cz]  
  m_Number.Format("%d picture captured.",nCount); -AC`q/bCD  
 else 9^!wUwB  
  m_Number.Format("%d pictures captured.",nCount); x<s|vgl|  
  UpdateData(FALSE); n8$=f'Hgb  
} n$YE !D'  
2m\m/O  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) F@1d%c  
{ lBmm(<~Z  
 if(pMsg -> message == WM_KEYDOWN) U. (Tl>K|0  
 { Mn@$;\:  
  if(pMsg -> wParam == VK_ESCAPE) xg} ug[  
   return TRUE; "5}%"-#  
  if(pMsg -> wParam == VK_RETURN) YDFCGA  
   return TRUE; ]`d2_mu  
 } f^?uY8<  
 return CDialog::PreTranslateMessage(pMsg); )v1CC..  
} 's.~$  
`NSy"6{Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %[ /<+  
{ sB6dp D  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ~:EW>Fq%i  
  SaveBmp(); ^df x~C  
  return FALSE; G?/c/rG  
} 4uUs7T  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~ezCu_  
 CMenu pop; qm'b'!gq~  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); sT`^ljp4  
 CMenu*pMenu=pop.GetSubMenu(0); &K *X)DAs  
 pMenu->SetDefaultItem(ID_EXITICON); hiwIWd:H  
 CPoint pt; %$TEDr!  
 GetCursorPos(&pt); #Qd' + M  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); k" YHsn  
 if(id==ID_EXITICON) x@m<Ym-  
  DeleteIcon(); j{;|g%5t  
 else if(id==ID_EXIT) ) * TF"  
  OnCancel(); 9U^$.Lb  
 return FALSE; QrC/ssf}  
} k_?~<vTM  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Hbk&6kS  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) FJT1i@N  
 AddIcon(); XsUUJuCG  
 return res; /.P9MSz0G  
} 2xn<E>]  
Pz@/|&]  
void CCaptureDlg::AddIcon() `(DJs-xD  
{ bxwkTKr'  
 NOTIFYICONDATA data;  s4$X  
 data.cbSize=sizeof(NOTIFYICONDATA); /.$L"u  
 CString tip; ^PqMi:htc  
 tip.LoadString(IDS_ICONTIP); iCrxV{   
 data.hIcon=GetIcon(0); #*2Rp8n  
 data.hWnd=GetSafeHwnd(); ~;unpym'  
 strcpy(data.szTip,tip); 62kb2C  
 data.uCallbackMessage=IDM_SHELL; w^{! U  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; =IHje;s  
 data.uID=98; 7tgFDLA  
 Shell_NotifyIcon(NIM_ADD,&data); O-PdM`mqW  
 ShowWindow(SW_HIDE); [bjN f2  
 bTray=TRUE; :#$F)]y'\  
} J#aVo &.Y  
<MdGe1n  
void CCaptureDlg::DeleteIcon() #hJQbv=B"  
{ bRPO:lAy  
 NOTIFYICONDATA data; =nU/ [T.  
 data.cbSize=sizeof(NOTIFYICONDATA); h/<=u9J  
 data.hWnd=GetSafeHwnd(); R#qI( V  
 data.uID=98; eOnT W4  
 Shell_NotifyIcon(NIM_DELETE,&data); ^u)rB<#BR  
 ShowWindow(SW_SHOW); i2PZ'.sL  
 SetForegroundWindow(); 5/M ED}9C(  
 ShowWindow(SW_SHOWNORMAL); t3b@P4c \  
 bTray=FALSE; [U.v:tR   
} 3.vgukkk5  
GaBTj_3  
void CCaptureDlg::OnChange() VT=K"`EpQ  
{ mxJXL":|  
 RegisterHotkey(); =_PvrB2'  
} qC@Ar)T  
=g~j=v ,e  
BOOL CCaptureDlg::RegisterHotkey() XmWlv{T+  
{ S|K}k:v8  
 UpdateData(); A#DR9Eq  
 UCHAR mask=0; i-lKdpv  
 UCHAR key=0; /IR#A%U  
 if(m_bControl) +\`rmI  
  mask|=4; 6GINmkA  
 if(m_bAlt) 6t}XJB$+7  
  mask|=2; q*8lnk  
 if(m_bShift) 2 9#]Vr  
  mask|=1; kNPDm6m  
  key=Key_Table[m_Key.GetCurSel()]; Z]vL%Gg*!  
 if(bRegistered){ /P+q}L %  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); qn"K9k  
  bRegistered=FALSE; 1R*=.i%W  
 } 6D/'`  
 cMask=mask; Hk;-5A|9  
 cKey=key; zn)yFnB!TH  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); `;F2n2@  
 return bRegistered; f z}?*vPW  
} >I<PO.c!  
[B9;?G  
  四、小结 'MQ%)hipA  
"C74  
  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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