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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: ( =~&+z  
  P(F+f `T  
  一、实现方法 KM^ufF2[  
y~()|L[  
  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: ")=X4]D  
P#=`2a#G  
#pragma data_seg("shareddata") 8 r_>t2$  
HHOOK hHook =NULL; //钩子句柄 Xy5e5K  
UINT nHookCount =0; //挂接的程序数目 8Q_SRwN  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 >jD[X5Y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 4Y[1aQ(%  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey (}}S9 K  
static int KeyCount =0; W`c'=c  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 M Y|w  
#pragma data_seg() yX~v-N!X  
s%<eD  
  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。 [l,Ei?  
3}e%[AKh  
  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: ^o7;c[E`  
M)SEn/T-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 8#vc(04(  
cKey,UCHAR cMask) / X1 x  
{ _a1x\,R|DB  
 BOOL bAdded=FALSE; )"pF R4  
 for(int index=0;index<MAX_KEY;index++){ uu`G 2[t  
  if(hCallWnd[index]==0){ S~|T4q(  
   hCallWnd[index]=hWnd; }iuWAFZbGS  
   HotKey[index]=cKey; j_Yp>=+[  
   HotKeyMask[index]=cMask; I_RsYw  
   bAdded=TRUE; qgfi\/$6  
   KeyCount++; o"*AtGR+"  
   break; 812$`5l  
  } t.;LnrY  
 } ~?(N  
 return bAdded; rS;Dmm  
} 7Hs%Cc"  
//删除热键 EY tQw(!Q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f k&8]tK4  
{ ^pUHKXihD  
 BOOL bRemoved=FALSE; >p"c>V& 8  
 for(int index=0;index<MAX_KEY;index++){ U*) 8G  
  if(hCallWnd[index]==hWnd){ L*:jXmUM_~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ aTt 12Sc  
    hCallWnd[index]=NULL; I"GB <oB  
    HotKey[index]=0; ?"g!  
    HotKeyMask[index]=0; @ta7"6p-i@  
    bRemoved=TRUE; 13>0OKg`#  
    KeyCount--; UeRj< \"Q  
    break; D|{jR~J)xK  
   } HPZ}*m'  
  } Ftr5k^!  
 } ')$+G152  
 return bRemoved; 4q k9NK2 U  
} 9g mW&{6q  
!_Wi!Vr_  
&wV]"&-  
  DLL中的钩子函数如下: K57&yVX  
qw^uPs7Uw  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) adR)Uq9  
{ 3xaR@xjS  
 BOOL bProcessed=FALSE; cH&J{WeZa  
 if(HC_ACTION==nCode) -[wGX}}  
 { r4SXE\ G  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 #~ )IJ  
   switch(wParam) V{!J-nO  
   {   bJX)$G  
    case VK_MENU: J|qZ+A[z  
     MaskBits&=~ALTBIT; ax<?GjpM  
     break; LA}S yt\F  
    case VK_CONTROL: 9@Jtaq>jf  
     MaskBits&=~CTRLBIT; Hhcpp7cr'  
     break; rp ;b" q  
    case VK_SHIFT: }F#okU  
     MaskBits&=~SHIFTBIT; ,Pdf,2  
     break; uo@n(>}EL  
    default: //judge the key and send message vwxXgk  
     break; GJ_7h_4  
   } QD0"rxZJ  
   for(int index=0;index<MAX_KEY;index++){ ?M\{&mlF  
    if(hCallWnd[index]==NULL) *=V~YF:Qb  
     continue; # mV{#B=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9[.8cg*  
    { ,)vDeU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _I:/ZF5  
     bProcessed=TRUE; A\HxDIU  
    } `ojoOB^L  
   } u=`L )  
  } \nPEyw,U  
  else if((lParam&0xc000ffff)==1){ //有键按下 ~Vr.J}]J  
   switch(wParam) )p<ExMIxd  
   { ~?K~L~f5  
    case VK_MENU: 0.8  2kl  
     MaskBits|=ALTBIT; }&w Ur>=  
     break; ^c9t'V`IWQ  
    case VK_CONTROL: CEX " D`  
     MaskBits|=CTRLBIT; t.xxSU5~%  
     break; AP'*Nh@Ik(  
    case VK_SHIFT: ^\4h<M  
     MaskBits|=SHIFTBIT; B><d9d  
     break; iKX-myCz  
    default: //judge the key and send message wk5s)%V  
     break; ^ hZ0IM  
   } )b)-ZS7  
   for(int index=0;index<MAX_KEY;index++){ xc=b |:A  
    if(hCallWnd[index]==NULL) ^")Q YE  
     continue; lh7jux  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Nn!+,;ut  
    { W*Zkc:{eB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); DH\0z[  
     bProcessed=TRUE; ~?d Nd  
    } #h` V>;  
   } wl#@lOv-P  
  } (|klSz_4LM  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 9\_eK,*B  
   for(int index=0;index<MAX_KEY;index++){ ;$.J3!  
    if(hCallWnd[index]==NULL) Egg=yF>T  
     continue; RI(DXWM|h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) F8jd'OR  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0i!uUF  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 D1zBsi94D  
   } p@xf^[50k  
  } _m5uDF?[  
 } _Kl_61k  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Oo5w?+t  
} `6~Aoe  
"s0)rqf<  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 2$+bJJM  
WW4vn|0v  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v%+:/m1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Br1&8L-|%  
% 5M/s'O?i  
  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: kMi/>gpQ  
[j=yMP38!:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) + B B@OW  
{ s4A43i'g!h  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) *>7>g"  
 { m% -g~q  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 f$e[u E r  
  SaveBmp(); 7puFz4+f  
  return FALSE; ObVGV  
 } CZud& <  
 …… //其它处理及默认处理 \2N!:%k  
} Ql/cN%^j$  
v$7QIl_/7  
Mm.<r-b  
  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。 _aGOb;h  
8i>ZY  
  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。 R!\_rc1/  
vK|E>nL  
  二、编程步骤 8@i7pBl@  
xjfV?B'Y}V  
  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"; :W!7mna  
~.{/0T  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; G&D7a/G\  
+)!YrKuu  
  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; Q sZx) bO  
dP# |$1  
  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; ub^h&= \S  
~ $Tkn_w#  
  5、 添加代码,编译运行程序。 <"{qk2LS1  
Uzz'.K(Mv|  
三、程序代码 rI= v  
be]bZ 1f  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Tl(^  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) F, W~,y  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ "-e \p lKj  
#if _MSC_VER > 1000 G18F&c~  
#pragma once sqEI4~514  
#endif // _MSC_VER > 1000 $?Yry. 2  
#ifndef __AFXWIN_H__ /oR0+sH]  
#error include 'stdafx.h' before including this file for PCH Dv|#u|iw  
#endif @mOH"acGn?  
#include "resource.h" // main symbols k;K)xb[w|  
class CHookApp : public CWinApp U 9_9l7&r  
{ (D#B_`;-  
 public: fkuLj%R  
  CHookApp(); ii[F]sR\  
  // Overrides qkt0**\  
  // ClassWizard generated virtual function overrides QLXN*c  
  //{{AFX_VIRTUAL(CHookApp) Vq2y4D?  
 public: HG^B#yX  
  virtual BOOL InitInstance(); .{ocV#{s  
  virtual int ExitInstance(); jF ^~p9z  
  //}}AFX_VIRTUAL msP{l^%0  
  //{{AFX_MSG(CHookApp) rID#`:Hl-|  
  // NOTE - the ClassWizard will add and remove member functions here. EN$2,qf  
  // DO NOT EDIT what you see in these blocks of generated code ! K-bD<X  
  //}}AFX_MSG *W.C7=  
  DECLARE_MESSAGE_MAP() <;vbsksZeH  
}; f,h J~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); h].<t&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "$#xK|t  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;YA(|h<  
BOOL InitHotkey(); |SoCRjuCPM  
BOOL UnInit(); }YB*]<]  
#endif :o|\"3  
\w/yF4,3<w  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. `IP/d  
#include "stdafx.h" +ln9c  
#include "hook.h" ^V?<K.F  
#include <windowsx.h> ^8 zR  
#ifdef _DEBUG rf $QxJ  
#define new DEBUG_NEW o)Iff)m$  
#undef THIS_FILE $;1#To  
static char THIS_FILE[] = __FILE__;  3,p]/Z_  
#endif +MR.>"  
#define MAX_KEY 100 wN@oYFoL  
#define CTRLBIT 0x04 8J:}%DaxL  
#define ALTBIT 0x02 DK$X2B"cV  
#define SHIFTBIT 0x01 JLnH&(O  
#pragma data_seg("shareddata") {K+i cTL3  
HHOOK hHook =NULL; (KFCs^x7wG  
UINT nHookCount =0; C<NLE-  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey o C<.=2]  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT -8; 7Sp1  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey bSiYHRH.e  
static int KeyCount =0; #r#1JtT  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift T=iJGRctB  
#pragma data_seg() Id_2PkIN$~  
HINSTANCE hins; r"C  
void VerifyWindow(); #bUXgn>  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ^Y=\#-Dd  
//{{AFX_MSG_MAP(CHookApp) k3u "A_"c  
// NOTE - the ClassWizard will add and remove mapping macros here. G0/4JSH  
// DO NOT EDIT what you see in these blocks of generated code! T ? $:'XJ  
//}}AFX_MSG_MAP 5]NqRI^0  
END_MESSAGE_MAP() Kf>A\l^X7  
C>-aIz!y  
CHookApp::CHookApp() O[I\A[*  
{ @OV|]u  
 // TODO: add construction code here, *AG#316  
 // Place all significant initialization in InitInstance <oR a3Gi(%  
} q;R],7Re  
;|p BFKx  
CHookApp theApp; ,=UK}*e"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) E0Y-7&Fv  
{ RTE8Uq36  
 BOOL bProcessed=FALSE; RP~|PtLw_  
 if(HC_ACTION==nCode) tmv&U;0Z  
 { (pY 7J  
  if((lParam&0xc0000000)==0xc0000000){// Key up @Fluc,Il  
   switch(wParam)  `7 vHt`  
   { :Pvzl1  
    case VK_MENU: gYNjzew'  
     MaskBits&=~ALTBIT; 1$D_6U:H0  
     break; +b.g$CRr  
    case VK_CONTROL: T^Y([23  
     MaskBits&=~CTRLBIT; 2/?`J  
     break; mR&H9 NG  
    case VK_SHIFT: *C5R}9O5  
     MaskBits&=~SHIFTBIT; ;1:Js0=;H  
     break; <D:.(AUeO  
    default: //judge the key and send message q|j2MV5#g  
     break; (a[y1{DLy  
   } _kj wFq  
   for(int index=0;index<MAX_KEY;index++){ ur3(HL  
    if(hCallWnd[index]==NULL) [NaN>BZ?  
     continue; !qv ea,vw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7({]x*o*%  
    { Hc>m;[M)l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); gG]Eeu+z   
     bProcessed=TRUE; H| 8Qp*  
    } >d,jKlh^.%  
   } v16 JgycM  
  } n2]/v{E;/  
  else if((lParam&0xc000ffff)==1){ //Key down hM;lp1l  
   switch(wParam) ->l%TCHP  
   { Jl5c [F  
    case VK_MENU: X#*JWQO=  
     MaskBits|=ALTBIT; U> cV|  
     break; \!k1a^ZP  
    case VK_CONTROL: d/ARm-D  
     MaskBits|=CTRLBIT; eZSNNgD<:  
     break; =osv3>&q  
    case VK_SHIFT: &7`^i.fh)  
     MaskBits|=SHIFTBIT; YpH&<$x:  
     break; S'4(0j  
    default: //judge the key and send message rf?qdd(~cH  
     break; yUZb #%n  
   } O!P H&;H  
   for(int index=0;index<MAX_KEY;index++) y`F3Hr c  
   { U&Wt%U{  
    if(hCallWnd[index]==NULL) p^Ak1qm~e  
     continue; jFASX2.p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8vMG5#U[  
    { -*$HddD  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); L\@I*QP  
     bProcessed=TRUE; UJM1VAJ0  
    } V8rx#H~  
   } LS7, a|  
  } n\xX},  
  if(!bProcessed){ y0#u9t"Z;  
   for(int index=0;index<MAX_KEY;index++){ oXb;w@:  
    if(hCallWnd[index]==NULL) Fx;QU)1l3  
     continue; )6q,>whI]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) vr6MU<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); cd(GvX'  
   } H,DM1Z9rz  
  } ~F4fFQ-yy  
 } E~]R2!9  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9f hsIe  
} ;\]b T;#  
 f4Xk,1Is  
BOOL InitHotkey() ?AJKBW^  
{ 7* yzEM  
 if(hHook!=NULL){ *~t6(v?  
  nHookCount++; v.pBX<  
  return TRUE; tn Pv70m  
 } j6Yy6X]  
 else K POa|$  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); yf[~Yl>Ogw  
  if(hHook!=NULL) -=~| ."O  
   nHookCount++; ~$)2s7 O  
  return (hHook!=NULL); Pb1*\+  
} VFRi1\G  
BOOL UnInit() "JlpU-8[0@  
{ sE:M@`2L  
 if(nHookCount>1){ `%+Wz0(K  
  nHookCount--; g/P+ZXJ  
  return TRUE; -(  
 } bYEy<7)x  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 3~uW I%I`  
 if(unhooked==TRUE){ GT0Of~?f  
  nHookCount=0; P*FMwrJj>r  
  hHook=NULL; IF44F3(V4  
 } syaPpM Q-  
 return unhooked; nm6h%}xND<  
} ~]nSSD)\  
;1%-8f:lW  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) W3MU1gl6k{  
{ wE?'Cl  
 BOOL bAdded=FALSE; KwPOO{4]g  
 for(int index=0;index<MAX_KEY;index++){ B"!l2  
  if(hCallWnd[index]==0){ a-=8xs'  
   hCallWnd[index]=hWnd; ^pQCNKLBY  
   HotKey[index]=cKey; y#U+c*LB  
   HotKeyMask[index]=cMask; G LIi6  
   bAdded=TRUE; aqj@Cjk4Z  
   KeyCount++; gk"$,\DI  
   break; c_vqL$Dl  
  } (oEC6F  
 } ?d{Na= O\  
 return bAdded; xx#zN0I>-y  
} `< xn8h9p  
w8U&ls1b  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9s6U}a'c  
{ G#d{,3Gq1  
 BOOL bRemoved=FALSE; Urr@a/7  
 for(int index=0;index<MAX_KEY;index++){ ]sE?ezu  
  if(hCallWnd[index]==hWnd){ C~o7X^[R\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &e#~<Wm82  
    hCallWnd[index]=NULL; Jl#%uU/sx  
    HotKey[index]=0; vb<oi&X  
    HotKeyMask[index]=0; i*/Yz*<  
    bRemoved=TRUE; D/vOs[X o,  
    KeyCount--; NT e5  
    break; 5N/%v&1  
   } D ,o}el  
  } EfCx`3~EX  
 } Hn5|B 3vN  
 return bRemoved; @d mV  
} Exc9` 7%.  
va}Pj#=  
void VerifyWindow() G!>z;5KuS  
{ e\!0<d  
 for(int i=0;i<MAX_KEY;i++){ t!r A%*  
  if(hCallWnd!=NULL){ ihIVUu-M  
   if(!IsWindow(hCallWnd)){ \=:~ki=@B  
    hCallWnd=NULL; j g8fU  
    HotKey=0; 57umx`m  
    HotKeyMask=0; jRJn+  
    KeyCount--; 0n;< ge&~R  
   } Wu[&Wv~  
  } { g/0x,-Z  
 } /v- 6WSN  
} }\\KYyjY  
_'{_gei_P  
BOOL CHookApp::InitInstance() amOnqH-(  
{ c'%-jG)\  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 95A1:A^t  
 hins=AfxGetInstanceHandle(); mlJ!:WG  
 InitHotkey(); @+Si?8\  
 return CWinApp::InitInstance(); =g9*UzA"O  
} F'4w;-ax  
Y }$/e  
int CHookApp::ExitInstance() a yCY~=i  
{ Y2n!>[[.  
 VerifyWindow(); -likj# Z  
 UnInit(); UNom-  
 return CWinApp::ExitInstance(); d1AioQ9  
} 5-aj 2>=7  
W6?pswQ  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file G,o6292hj  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) gy#/D& N[  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ qf!p 9@4F[  
#if _MSC_VER > 1000 #_6I w`0  
#pragma once ]P.'>4  
#endif // _MSC_VER > 1000 F`gi_; c  
/178A;J y  
class CCaptureDlg : public CDialog OSs&r$  
{ B@&4i?yJ  
 // Construction fZ0M%f  
 public: 5ymk\Lw  
  BOOL bTray; [fAV5U  
  BOOL bRegistered; `|{-+m  
  BOOL RegisterHotkey(); Al}6q{E9+8  
  UCHAR cKey; d:BG#\e]v  
  UCHAR cMask; 06O2:5zF  
  void DeleteIcon(); Fv~20G (O  
  void AddIcon(); R=gb'  
  UINT nCount; mq@6Q\Z+  
  void SaveBmp(); 8K:y\1  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor % tS,}ze  
  // Dialog Data /t+f{VX$  
  //{{AFX_DATA(CCaptureDlg) o /j*d3  
  enum { IDD = IDD_CAPTURE_DIALOG }; (;T^8mI2  
  CComboBox m_Key; fmU {  
  BOOL m_bControl; 8(pp2rlR  
  BOOL m_bAlt; 1S{D6#bE  
  BOOL m_bShift; CyS$|E  
  CString m_Path; &]`(v}`]  
  CString m_Number; ''yB5#^w(  
  //}}AFX_DATA 0 ?s|i :  
  // ClassWizard generated virtual function overrides %j.0G`x9 +  
  //{{AFX_VIRTUAL(CCaptureDlg) t{xf:~B  
 public: zk$FkbX  
  virtual BOOL PreTranslateMessage(MSG* pMsg); #.rdQ,)<  
 protected: b*a#<K$T_  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support X{5vXT\/y  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); S\:P-&dC  
  //}}AFX_VIRTUAL ZP@ $Q%up  
  // Implementation >0/i[k-dk  
 protected: q!.byrod  
  HICON m_hIcon; ) i;1*jK  
  // Generated message map functions ~IYUuWF(  
  //{{AFX_MSG(CCaptureDlg) - Ajo9H  
  virtual BOOL OnInitDialog(); ] eotc2?u  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); VCV"S>aVf  
  afx_msg void OnPaint(); Q-_N2W ?  
  afx_msg HCURSOR OnQueryDragIcon(); CAfGH!l!  
  virtual void OnCancel(); ((H^2KJn  
  afx_msg void OnAbout(); t<#TJ>Le  
  afx_msg void OnBrowse(); g%sluT[#  
  afx_msg void OnChange(); C'9Cr}cZ.  
 //}}AFX_MSG arIf'CG6  
 DECLARE_MESSAGE_MAP() a =J^  
}; my(2;IJ#{  
#endif n6wV.?8  
\y97W&AN  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file gH12[Us'`  
#include "stdafx.h" :ci5r;^  
#include "Capture.h" T1ut"Zu  
#include "CaptureDlg.h" KI)M JG:t  
#include <windowsx.h> 00(on28b  
#pragma comment(lib,"hook.lib") cr%"$1sY;  
#ifdef _DEBUG gwLf'  
#define new DEBUG_NEW YmL06<Mh  
#undef THIS_FILE NP0\i1P>.?  
static char THIS_FILE[] = __FILE__; T$>WE= Y  
#endif nCUg ,;_=  
#define IDM_SHELL WM_USER+1 v\c>b:AofD  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); EAT"pxP  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); N-G1h?e4  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; fT;s-v[`k  
class CAboutDlg : public CDialog } df W%{  
{ 5 h-@|t  
 public: s3z$e+A8  
  CAboutDlg(); ?M8dP%&r  
  // Dialog Data U>YAdrx2a  
  //{{AFX_DATA(CAboutDlg) &TUWW/?T  
  enum { IDD = IDD_ABOUTBOX }; &-;4.op  
  //}}AFX_DATA zNs55e.rx  
  // ClassWizard generated virtual function overrides xcd#&  
  //{{AFX_VIRTUAL(CAboutDlg) S=MEG+Ad  
 protected: ?:vv50  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support t_o['F  
  //}}AFX_VIRTUAL m4**~xfC  
  // Implementation bp* ^z,w  
 protected: \d 6C%S!  
  //{{AFX_MSG(CAboutDlg) = I:.X ;  
  //}}AFX_MSG urbp#G/>  
  DECLARE_MESSAGE_MAP() vmU@^2JSJ  
}; Z?6%;n^ 54  
@3) (BpFe  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) qyZ" %Kz  
{ =b%MXT  
 //{{AFX_DATA_INIT(CAboutDlg) 1a?!@g )  
 //}}AFX_DATA_INIT O9G[j=U  
} }u\])I3  
$:8x(&+/@  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) V\>K]mwD  
{ 1ct;A_48  
 CDialog::DoDataExchange(pDX); x6BuF_.   
 //{{AFX_DATA_MAP(CAboutDlg) YJ^] u}  
 //}}AFX_DATA_MAP bn#"?6Z2  
} Bn^0^J-  
TITKj?*o  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) L9r8BK;  
 //{{AFX_MSG_MAP(CAboutDlg) J*r*X.  
 // No message handlers -f3p U:G8  
 //}}AFX_MSG_MAP w{I vmdto  
END_MESSAGE_MAP() ^hG-~z<  
{o)Lc6T8s  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) qz+dmef  
: CDialog(CCaptureDlg::IDD, pParent) H['N  
{ Vy6qbC-Kt  
 //{{AFX_DATA_INIT(CCaptureDlg) n&L+wqJ  
  m_bControl = FALSE; 4;w;'3zq  
  m_bAlt = FALSE; sQ=]NF)\  
  m_bShift = FALSE; hB "fhX  
  m_Path = _T("c:\\"); tWJZoD6}h  
  m_Number = _T("0 picture captured."); 2POXj!N  
  nCount=0; rx'RSo#1O  
  bRegistered=FALSE; !`k1:@NZ  
  bTray=FALSE; _Us#\+]_:  
 //}}AFX_DATA_INIT Z 8S\@I  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ?h3Y)5xT  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); :{PJI,  
} r(6Y*<  
GOj-)i/_  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ot,jp|N>f~  
{ O(#)m>A  
 CDialog::DoDataExchange(pDX); &T+atL`N  
 //{{AFX_DATA_MAP(CCaptureDlg) %D UH@j  
  DDX_Control(pDX, IDC_KEY, m_Key); Z 6t56"u  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); i@C].X  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ]}Mj)J"m  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); US+Q~GTA  
  DDX_Text(pDX, IDC_PATH, m_Path); .?D7dyU l1  
  DDX_Text(pDX, IDC_NUMBER, m_Number); `n.5f[wC  
 //}}AFX_DATA_MAP %oF}HF.  
} $I!XSz"/e  
_ q(ko/T  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) !-z'2B*:^  
//{{AFX_MSG_MAP(CCaptureDlg) 1A?W:'N  
 ON_WM_SYSCOMMAND() mf A{3  
 ON_WM_PAINT() tGD6AI1"I  
 ON_WM_QUERYDRAGICON() i{Uc6 R6  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) &Q%zl9g(g  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) F<ZYh  
 ON_BN_CLICKED(ID_CHANGE, OnChange) l\E%+?K+^  
//}}AFX_MSG_MAP }'5MK  
END_MESSAGE_MAP() nii A7Ux  
3YeG$^y"  
BOOL CCaptureDlg::OnInitDialog() .\\DKh%  
{ bH-ub2@qO  
 CDialog::OnInitDialog(); ) mI05  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <>n0arAn  
 ASSERT(IDM_ABOUTBOX < 0xF000); :<ka3<0%  
 CMenu* pSysMenu = GetSystemMenu(FALSE); $CxKuB(  
 if (pSysMenu != NULL) %OtFHhb  
 { V("{)0~O  
  CString strAboutMenu; @D)al^]x6  
  strAboutMenu.LoadString(IDS_ABOUTBOX); iMt:9|yF}8  
  if (!strAboutMenu.IsEmpty()) _ ?TN;  
  { \(~y?l  
   pSysMenu->AppendMenu(MF_SEPARATOR); ZWii)0'PV  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); z(o,m3@v  
  } !5wIIS:FT  
 } 7WZrSC  
 SetIcon(m_hIcon, TRUE); // Set big icon t![7uU.W  
 SetIcon(m_hIcon, FALSE); // Set small icon 'UkxS b  
 m_Key.SetCurSel(0); 062,L~&E  
 RegisterHotkey(); Xk:OL,c  
 CMenu* pMenu=GetSystemMenu(FALSE); &*sP/z  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); *xc_k"\  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); +QB"8-  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); {qDSPo  
 return TRUE; // return TRUE unless you set the focus to a control i}b${n o  
} ~aw.(A?MI  
Z<U6<{b  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #w;v0&p  
{ gwNq x"  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) M])ZK  
 { KTK <gV9:  
  CAboutDlg dlgAbout; PEN \-*Pv  
  dlgAbout.DoModal(); Ulhk$CPA  
 } r)qnl9?;`]  
 else xE1 eT,  
 { &6DMk-  
  CDialog::OnSysCommand(nID, lParam); `id 9j  
 } d^/3('H6  
} R[Ll59-  
Wi>!{.}%A  
void CCaptureDlg::OnPaint() mrTlXXz  
{ c_\YBe]wJ  
 if (IsIconic()) |b[+I?X  
 { =nz}XH%=  
  CPaintDC dc(this); // device context for painting >O1[:%Z1  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 3WN`y8l  
  // Center icon in client rectangle ot @|!V  
  int cxIcon = GetSystemMetrics(SM_CXICON); CPgCjtY  
  int cyIcon = GetSystemMetrics(SM_CYICON); z MLK7+  
  CRect rect; c/Qt Ot  
  GetClientRect(&rect); nJbtS#`G4  
  int x = (rect.Width() - cxIcon + 1) / 2; gHhh>FFAq  
  int y = (rect.Height() - cyIcon + 1) / 2; -g)9R%>-  
  // Draw the icon Z 1zVwHa_  
  dc.DrawIcon(x, y, m_hIcon); `J]fcE%T0R  
 } a-y+@#;2_  
 else 33jovK 2  
 { >Wh}f3C  
  CDialog::OnPaint(); U QE qX  
 } vQ<90Z xqB  
} N03G>fZ  
R,)}>X|<  
HCURSOR CCaptureDlg::OnQueryDragIcon() Xm+8  
{ 'iy*^A `Y  
 return (HCURSOR) m_hIcon; 0$_oT;{8  
} YiYV>gaf"H  
vK(i 9>;7  
void CCaptureDlg::OnCancel() ur*T%b9&  
{ (E/lIou  
 if(bTray) Fd?"-  
  DeleteIcon(); 17D"cP  
  CDialog::OnCancel(); !)  S ?m  
} ~n[d4qV&  
?in|qevL  
void CCaptureDlg::OnAbout() dX\.t <  
{ "8'@3$>R=  
 CAboutDlg dlg; (&&4J{`W9  
 dlg.DoModal(); 6`!Fv-  
} 9k9_mjLZ  
RZ6xdq}>  
void CCaptureDlg::OnBrowse() 6Ztq  
{ F&])P- !3  
 CString str; c<uN"/gi*  
 BROWSEINFO bi; bB }$'  
 char name[MAX_PATH]; >:zK?(qu,N  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); :}r.  
 bi.hwndOwner=GetSafeHwnd(); uqM yoIc  
 bi.pszDisplayName=name; YWMGB#=  
 bi.lpszTitle="Select folder"; tBNoI  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 2LNRtW*  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); a,3j,(3  
 if(idl==NULL) cHcmgW\4  
  return; I96C i2)m  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); !h(|\" }  
 str.ReleaseBuffer(); \(VTt|}By$  
 m_Path=str; bfA=3S"0  
 if(str.GetAt(str.GetLength()-1)!='\\') 9m|kgY# 4  
  m_Path+="\\"; p`nPhk,:b  
 UpdateData(FALSE); ;2@BO-3K  
} +zu(  
m~@;~7Ix  
void CCaptureDlg::SaveBmp() ?s\ OUr  
{ 3ia^\ jw  
 CDC dc; ?I/qE='*  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); BJgW,huLy  
 CBitmap bm; 53c0 E  
 int Width=GetSystemMetrics(SM_CXSCREEN); ?|WoIV.  
 int Height=GetSystemMetrics(SM_CYSCREEN); ?notxE7 ]  
 bm.CreateCompatibleBitmap(&dc,Width,Height); :[\v  
 CDC tdc; baJxU:Y=p  
 tdc.CreateCompatibleDC(&dc); W3Dc r@Dy  
 CBitmap*pOld=tdc.SelectObject(&bm); v$(lZa1  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 61/.K_%I.  
 tdc.SelectObject(pOld); LVc4CE f  
 BITMAP btm; O:TlIJwW  
 bm.GetBitmap(&btm); {g2@6ct  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; #?*WPq  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); pAb.c  
 BITMAPINFOHEADER bih; NM]s8cK_  
 bih.biBitCount=btm.bmBitsPixel; _$wmI/_J M  
 bih.biClrImportant=0; WuPH'4b 5  
 bih.biClrUsed=0; ?6L&WB  
 bih.biCompression=0; 6 ` Aj%1  
 bih.biHeight=btm.bmHeight; "VkTY|a  
 bih.biPlanes=1; tniDF>Rb  
 bih.biSize=sizeof(BITMAPINFOHEADER); lZyG)0t,g  
 bih.biSizeImage=size; y_*PQZ$c<  
 bih.biWidth=btm.bmWidth; `Ja?fI'H-  
 bih.biXPelsPerMeter=0; $={:r/R`i  
 bih.biYPelsPerMeter=0; T21ky>8E  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); cE`6uq7 p  
 static int filecount=0; &FH2fMLQ  
 CString name; 9R;/*$  
 name.Format("pict%04d.bmp",filecount++); {o!KhF:[  
 name=m_Path+name; NZP.0coY  
 BITMAPFILEHEADER bfh; :ml2.vP  
 bfh.bfReserved1=bfh.bfReserved2=0; \Y|~2Ls8tu  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 'eo KZX+  
 bfh.bfSize=54+size; i<H wTmm$  
 bfh.bfOffBits=54; uC8L\UXk  
 CFile bf; CbPuoOl  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Oy<5>2^P  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); "z0zpHXek  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); OkCQ?]  
  bf.WriteHuge(lpData,size); 4l!@=qwn  
  bf.Close(); %honO@$  
  nCount++; q(zJ%Gv)  
 }  %VzKqh  
 GlobalFreePtr(lpData); fLSXPvm  
 if(nCount==1) ,*&G1|_6  
  m_Number.Format("%d picture captured.",nCount); R+nMy=I%8  
 else  vj51 g@  
  m_Number.Format("%d pictures captured.",nCount); ZAJp%   
  UpdateData(FALSE); B3H|+  
} /;7y{(o  
pM{nh00[  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Z.W66\8~}^  
{ s[K^9wz  
 if(pMsg -> message == WM_KEYDOWN) RlqQ  
 { &ISb~5  
  if(pMsg -> wParam == VK_ESCAPE) :Xn7Ha[f  
   return TRUE; !ALKSiSl  
  if(pMsg -> wParam == VK_RETURN) Yk'9U-.mc  
   return TRUE; 3' ~gvi I  
 } B|C/ Rk6?  
 return CDialog::PreTranslateMessage(pMsg); +$$$  
} #'-Sh7ycW  
UK$ms~H  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `6[I^qG".  
{ ^K7ic,{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ %.<H=!$  
  SaveBmp(); JOb*-q|y  
  return FALSE; pG34Qw  
} V7Z4T6j4  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ o]ag"Q  
 CMenu pop; uGwJ K`!~  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [6)UhS8  
 CMenu*pMenu=pop.GetSubMenu(0); KjFK/Og.  
 pMenu->SetDefaultItem(ID_EXITICON); Ti2Ls5H}  
 CPoint pt; `} m Q  
 GetCursorPos(&pt); v?0r`<Mn  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); &-czStQ  
 if(id==ID_EXITICON) [U@ *1  
  DeleteIcon(); "+z?x~rk  
 else if(id==ID_EXIT) K]qM~v<A  
  OnCancel(); CW)Z[<d8  
 return FALSE; ~%/Wupf  
} mCs#.%dU  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); &X|<@'933  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {TOmv  
 AddIcon(); h'i{&mS_b  
 return res; zVi15P$  
} ]l@ qra  
q;fKcblKj  
void CCaptureDlg::AddIcon() l"{Sm6:;-  
{ X*g(q0N<S  
 NOTIFYICONDATA data; '=E3[0W  
 data.cbSize=sizeof(NOTIFYICONDATA); uk9g<<3T  
 CString tip; Zes+/.sA}]  
 tip.LoadString(IDS_ICONTIP); yJsH=5A  
 data.hIcon=GetIcon(0); &f>eQ S=(  
 data.hWnd=GetSafeHwnd(); l{:a1^[>y  
 strcpy(data.szTip,tip); 8K;Y2 #  
 data.uCallbackMessage=IDM_SHELL; t ?h kL  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; $s4Wkq  
 data.uID=98; _TUk(Qe  
 Shell_NotifyIcon(NIM_ADD,&data); TgTnqR@/  
 ShowWindow(SW_HIDE); V $|<  
 bTray=TRUE; aYn8 ^  
} hKNY+S})g  
~"lJ'&J}  
void CCaptureDlg::DeleteIcon() v[TYc:L=  
{ ~1*A  
 NOTIFYICONDATA data; !@I}mQ ~  
 data.cbSize=sizeof(NOTIFYICONDATA); M wab!Ya  
 data.hWnd=GetSafeHwnd();  \dl ph  
 data.uID=98; <]Wlx`=/D  
 Shell_NotifyIcon(NIM_DELETE,&data); *9 Q^5;y  
 ShowWindow(SW_SHOW); [EY`am8[  
 SetForegroundWindow(); nRb^<cZf  
 ShowWindow(SW_SHOWNORMAL); BPqGJ7@  
 bTray=FALSE; [U8$HQ+x  
} 1z*kc)=JF8  
b?Pj< tA  
void CCaptureDlg::OnChange() /ahNnCtu?1  
{ Z~6[ Z  
 RegisterHotkey(); o<l 2r  
} 3Db3xN  
~P-*}q2J  
BOOL CCaptureDlg::RegisterHotkey() #fs|BV !  
{ {%.Lk'#9  
 UpdateData(); 4KI [D{  
 UCHAR mask=0; sM\lO  
 UCHAR key=0; dQgk.k  
 if(m_bControl) aV`&L,Q)7E  
  mask|=4; CKlL~f EL  
 if(m_bAlt) [4+q+  
  mask|=2; 3+xy4 G@L  
 if(m_bShift) +'#oz+  
  mask|=1; $ P: O/O=>  
  key=Key_Table[m_Key.GetCurSel()]; ukuo:P<a  
 if(bRegistered){ Jqr)V2Y  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); _M,lQ~  
  bRegistered=FALSE; ciMM^ZRIb  
 } D H^T x  
 cMask=mask; 7OVbP%n)d2  
 cKey=key; I,ci >/+b  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); _2hXa!yO  
 return bRegistered; k$Rnj`*^  
} wP"q<W g  
K{cbn1\,H  
  四、小结 cPn+<M#  
,>LRa  
  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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