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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: C7:;<<"P  
  ] ;" blB  
  一、实现方法 U51C /A  
EFSln*|  
  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: lB3@ jF  
g:V8"'  
#pragma data_seg("shareddata") ~?`V$G=?,  
HHOOK hHook =NULL; //钩子句柄 FtHR.S= u  
UINT nHookCount =0; //挂接的程序数目 b}s)3=X@q  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 v 9\2/B  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ;iEr+  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey apFY//(yu  
static int KeyCount =0; KVQ|l,E, /  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Y_S>S( 0  
#pragma data_seg() Twl>Pn>  
MOp06  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 *>"k/XUn$  
<e)5$Aj  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: b9FfDDOq"  
>AFX}N#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR AXBf\ )[  
cKey,UCHAR cMask) EdgcdSb7  
{ % VZ QX_  
 BOOL bAdded=FALSE; 1j4(/A  
 for(int index=0;index<MAX_KEY;index++){ gN./u   
  if(hCallWnd[index]==0){ dB`3"aSN7  
   hCallWnd[index]=hWnd; 5BWO7F0v"  
   HotKey[index]=cKey; !LDuCz -  
   HotKeyMask[index]=cMask; xweV8k/  
   bAdded=TRUE; VkKq<`t<  
   KeyCount++; 9'tOF  
   break; h0;PtQb1  
  } b3$aPwv  
 }  J^"  
 return bAdded; ,AX7~;hpq  
} 7=V s1TVc  
//删除热键 YTWlR]Tr6?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {Ftz4y)6  
{ SY: gr  
 BOOL bRemoved=FALSE; YSQB*FBz  
 for(int index=0;index<MAX_KEY;index++){ _hK83s4  
  if(hCallWnd[index]==hWnd){ (+_i^SqK  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <0?h$hf4c  
    hCallWnd[index]=NULL; Yr7%C  
    HotKey[index]=0; 8`edskWrU  
    HotKeyMask[index]=0; 4O~E4" ]  
    bRemoved=TRUE; RfM uWo:  
    KeyCount--; eJh4hp;x  
    break; ` #!~+  
   }  3)5Gzn  
  } zQ[g*  
 } s*blZdP  
 return bRemoved; kB`t_`7f  
} ,VtrQb)Yf  
/ /ty] j  
EqY e.dF,  
  DLL中的钩子函数如下: Z33&FUU  
)@%wj;>a  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0H|U9  
{ N;)Y+amg^  
 BOOL bProcessed=FALSE; hX?rIx  
 if(HC_ACTION==nCode) d~ lB4  
 { >O7ITy  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 H*SEzVb  
   switch(wParam) t")+ L{  
   {  %j '_I\  
    case VK_MENU: Y+ZQN>  
     MaskBits&=~ALTBIT; m~upTQz  
     break; cy R K&J  
    case VK_CONTROL: ^iWcuh_n  
     MaskBits&=~CTRLBIT; uU&,KEH  
     break; m -{t%[Y  
    case VK_SHIFT: c^N'g!on  
     MaskBits&=~SHIFTBIT; $}{u6*u.,  
     break; TB=KT j  
    default: //judge the key and send message vrS)VJg`  
     break; H<^*V8J 'w  
   } tcovMn '  
   for(int index=0;index<MAX_KEY;index++){ yQ^k%hHa  
    if(hCallWnd[index]==NULL) >g):xi3qK  
     continue; @ y{i.G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) q T16th[D  
    { ;g-L2(T05;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ! OM P]  
     bProcessed=TRUE; =44hI86  
    } fx W,S  
   } mp^;8??;  
  } w"-'  
  else if((lParam&0xc000ffff)==1){ //有键按下 ZcTxE]Y  
   switch(wParam) M?61g(  
   { 3YtFO;-  
    case VK_MENU: -jBk  
     MaskBits|=ALTBIT; P)7_RE*gY  
     break; IW48Sg  
    case VK_CONTROL: a$Lry?pb  
     MaskBits|=CTRLBIT; |sM#nhxK  
     break; M<f=xY2$v  
    case VK_SHIFT: c*O{?b  
     MaskBits|=SHIFTBIT; ? J;*  
     break; Dv7/eRt  
    default: //judge the key and send message LU#DkuIG  
     break; ZI<p%IQ   
   } k+(UpO=/*  
   for(int index=0;index<MAX_KEY;index++){ =:fFu,+{  
    if(hCallWnd[index]==NULL) l\vvM>#S  
     continue; c$<7&{Pb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %h "+J  
    { 9Y9 pKTU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); *`}4]OGv.  
     bProcessed=TRUE; T>"GH M  
    } 5W0'r'{  
   } >[4;K&$B  
  } ELF,T (  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 $EHnlaG8r  
   for(int index=0;index<MAX_KEY;index++){ ^1&xt(G  
    if(hCallWnd[index]==NULL) l:!4^>SC  
     continue; sFR'y.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :U5>. ):  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); +6vm4(3?  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Y(>]7  
   } G$ l>By  
  } ;pU#3e+P8  
 } XxW~4<r  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !}sYPz]7!  
} ~I0I#_$'P  
u8Ul +u  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: D`r^2(WW  
$qN+BKd]3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); X&^8[,"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u~X]W3  
WMB~? EDhv  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: t I9$m[  
05 ".;(  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {5+t\~q$  
{ Jo1=C.V`Y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) K5x&:z  
 { q#v&&]N=  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 {nH.  _  
  SaveBmp(); -9"hJ4  
  return FALSE; YoD1\a|  
 } U8?%Dq%i  
 …… //其它处理及默认处理 YaTJKgi"0  
} F+vgkqs@9  
+ M2|-C  
]Mv.Rul?~  
  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。 UzVnC:  
E<>Ev_5>  
  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。 imdfin?=   
qyMR0ai-  
  二、编程步骤 C& 0iWY\a  
< C\snB  
  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"; &Y"u*)bm  
Bb];qYuCO  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; &?(r# T  
7O{c>@\  
  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; tP2hU[7Z  
hV_eb6aj}P  
  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; %&bO+$H3  
![os5H.b#q  
  5、 添加代码,编译运行程序。 3O<:eS~  
2<Pi2s'  
三、程序代码 M{+Ie?ZI  
p=6Q0r|'  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ZK))91;v  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) n~ \"W  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ "Ko ^m(`  
#if _MSC_VER > 1000 Le"$ksu>  
#pragma once j+Nun  
#endif // _MSC_VER > 1000 w">XI)*z  
#ifndef __AFXWIN_H__ DPn]de:e  
#error include 'stdafx.h' before including this file for PCH M xUj7ae  
#endif Q9)/INh  
#include "resource.h" // main symbols +DS_'Tmr  
class CHookApp : public CWinApp )'(7E$d  
{ g"|QI=&_J  
 public: +\G/j]3f  
  CHookApp(); $trvNbco  
  // Overrides zYfn;s%A  
  // ClassWizard generated virtual function overrides 6/B"H#rN  
  //{{AFX_VIRTUAL(CHookApp) PgAC3%M6  
 public: 17[7)M88  
  virtual BOOL InitInstance(); %..{c#V  
  virtual int ExitInstance(); U<fe 'd  
  //}}AFX_VIRTUAL qsXK4`  
  //{{AFX_MSG(CHookApp) {ScilT  
  // NOTE - the ClassWizard will add and remove member functions here. h9c54Ux  
  // DO NOT EDIT what you see in these blocks of generated code ! MGeHccqh2  
  //}}AFX_MSG ]+Yd#<j(u  
  DECLARE_MESSAGE_MAP() &Cp)\`[y  
}; oqOv"yLJ:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); j?4k{?x  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /\_`Pkd3m  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); oEvXZ;F@.  
BOOL InitHotkey(); W}V L3s  
BOOL UnInit(); ac6Lv}w_  
#endif g@hg u   
*A.E?9pL\  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Q+gd|^Vc9  
#include "stdafx.h" ^il'Q_-{  
#include "hook.h" F`-|@k  
#include <windowsx.h> Ej>5PXp'2  
#ifdef _DEBUG Y!* \=h6h  
#define new DEBUG_NEW +CtsD9PA  
#undef THIS_FILE SU9qF73Y  
static char THIS_FILE[] = __FILE__; =xScHy{$  
#endif 'S\YNLqQ  
#define MAX_KEY 100 |H 0+.f;  
#define CTRLBIT 0x04 ~|kre:j9  
#define ALTBIT 0x02 f.cIhZF  
#define SHIFTBIT 0x01 XZhuV<  
#pragma data_seg("shareddata") jdiFb~5R  
HHOOK hHook =NULL; 9cud CF  
UINT nHookCount =0; ),y{.n:wm  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey .t|vwx  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT XNkw9*IT  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey {-D2K:m  
static int KeyCount =0; O0Y/y2d  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift SbU=Lkx#  
#pragma data_seg() #n5q$  
HINSTANCE hins; <&E3QeK  
void VerifyWindow(); [xq"[*Evv  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 5fuOl-M0W  
//{{AFX_MSG_MAP(CHookApp) 1wSJw  
// NOTE - the ClassWizard will add and remove mapping macros here. Y}%=:Yt  
// DO NOT EDIT what you see in these blocks of generated code! vUh.ev0  
//}}AFX_MSG_MAP EeC5HgIU'C  
END_MESSAGE_MAP() zk= 3L} C  
\Tq Km  
CHookApp::CHookApp() )]~'zOE_  
{ ?XO$ 9J  
 // TODO: add construction code here, Cp(,+ dD  
 // Place all significant initialization in InitInstance 7JNhCOBB  
} f@&C \  
} <; y,4f  
CHookApp theApp; JVE]Qb_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5#/" 0:2  
{ ?<VahDBS+A  
 BOOL bProcessed=FALSE; 8"l9W=  
 if(HC_ACTION==nCode) ,y@` =  
 { ]X/1u"  
  if((lParam&0xc0000000)==0xc0000000){// Key up {FyGh */  
   switch(wParam) qV0C2jZ2  
   { <Okk;rj2  
    case VK_MENU: m@  b~  
     MaskBits&=~ALTBIT; aY7kl  
     break; Q|Uq.UjY  
    case VK_CONTROL: ];bB7+  
     MaskBits&=~CTRLBIT; Jx[Z[RO2  
     break; ;B>2oq  
    case VK_SHIFT: ~_=ohb{  
     MaskBits&=~SHIFTBIT; 6?OH"!b2-}  
     break; Cc^`M9dP  
    default: //judge the key and send message HT7V} UiaO  
     break; 4jEPh{q  
   } qg?O+-+  
   for(int index=0;index<MAX_KEY;index++){ :9!? ${4R  
    if(hCallWnd[index]==NULL) -~T?xs0_  
     continue; [P`t8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @(2DfrC  
    { PW)XDo7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >i=^Mh-bm  
     bProcessed=TRUE; f;M7y:A8q,  
    } NltEX14Af  
   } RkP g&R;i  
  } =\H.C@r  
  else if((lParam&0xc000ffff)==1){ //Key down <EKDP>,~  
   switch(wParam) aV`4M VWOz  
   { ilL] pU-  
    case VK_MENU: odAeBQy  
     MaskBits|=ALTBIT; PEZ~og:w  
     break; {'P7D4w  
    case VK_CONTROL: l%@>)%LA  
     MaskBits|=CTRLBIT; Z'iXuI49  
     break; V4p4m@z^u  
    case VK_SHIFT: Fa78yY+6  
     MaskBits|=SHIFTBIT; FaO1?.  
     break; Kj;gxYD>6  
    default: //judge the key and send message cd,)GF  
     break; En%PIkxeR  
   } `ro~l_U;A  
   for(int index=0;index<MAX_KEY;index++) F/;uN5{o  
   { 8*y hx  
    if(hCallWnd[index]==NULL) w]Z*"B&h  
     continue; dX|(n.}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aV3:wp]Gn  
    { j]i:~9xKW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); iW\cLp "  
     bProcessed=TRUE; h;105$E1  
    } A+i|zo5p=k  
   } ZnDI J&S  
  } t>;u;XY!;  
  if(!bProcessed){ @MMk=/WDw  
   for(int index=0;index<MAX_KEY;index++){ Oi# F  
    if(hCallWnd[index]==NULL) Om`VQ?  
     continue; Y(QLlJ*)/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) W ]cJP  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #`R`!4  
   } m":lKXpQ  
  } Tvf%'%h1  
 } /Zs;dam  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); J WaI[n}  
} j?sq i9#  
)`5k fj  
BOOL InitHotkey() GZgu1YR  
{ ht _fbh(l  
 if(hHook!=NULL){ Bu4J8eLx  
  nHookCount++; Xk=bb267  
  return TRUE; g_8Bhe"ik  
 } &c<0g`x  
 else .*+?]  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); U_!Wg|  
  if(hHook!=NULL) ()L[l@m  
   nHookCount++; *`D(drnT{  
  return (hHook!=NULL); #4uuT?!  
} 3 D<s #  
BOOL UnInit() LliOhr4  
{ &K Ti[  
 if(nHookCount>1){ NYopt?Xg  
  nHookCount--; !bEy~.  
  return TRUE; HmxA2 ~C  
 } ~Y=v@] 2/  
 BOOL unhooked = UnhookWindowsHookEx(hHook); _?]E)i'RI  
 if(unhooked==TRUE){ E#'JYz@  
  nHookCount=0; 2xy &mNx  
  hHook=NULL; >jI( ^8?  
 } ]z5`!e)L  
 return unhooked; MVe:[=VOT|  
} 3|1ug92  
i U3GUsPy  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) xb`,9.a7  
{ I9JiH,+  
 BOOL bAdded=FALSE; ]P lD e8  
 for(int index=0;index<MAX_KEY;index++){ tNsiokOm  
  if(hCallWnd[index]==0){ c@p4,G  
   hCallWnd[index]=hWnd; vFuf{ @P  
   HotKey[index]=cKey; H(}Jt!/:  
   HotKeyMask[index]=cMask; \Km gFyF  
   bAdded=TRUE; pO^goo V\  
   KeyCount++; XN+~g.0  
   break; A6D.bJ)  
  } Z/#l~.o[  
 } 01bBZWX  
 return bAdded; HR0t[*  
} p'# (^  
cb ICO  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f+*wDH  
{ ~M@'=Q*~  
 BOOL bRemoved=FALSE; !nX}\lw  
 for(int index=0;index<MAX_KEY;index++){ 3awh>1N2 W  
  if(hCallWnd[index]==hWnd){ VU~ R  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 6]`XW 0{C  
    hCallWnd[index]=NULL; WJCh{Xn%*  
    HotKey[index]=0; qIm?F>> @  
    HotKeyMask[index]=0; '3B\I#  
    bRemoved=TRUE; H)#HK!F6f  
    KeyCount--; R4xoc;b  
    break; ;=.i+  
   } ?|Q[QP  
  } TRB)cJZ?  
 } HTfHAc?W  
 return bRemoved; R~9\mi5^UH  
} j Wa%vA  
zGm#er E  
void VerifyWindow() rYp]RX>  
{ H\zV/1~Y  
 for(int i=0;i<MAX_KEY;i++){ AB!P(  
  if(hCallWnd!=NULL){ ({GN.pC(  
   if(!IsWindow(hCallWnd)){ cTU%=/gbc<  
    hCallWnd=NULL; , ;'y <GA  
    HotKey=0; D8`dEB2|S  
    HotKeyMask=0; &2~c,] 9C  
    KeyCount--; ewOd =%  
   } 0/1Ay{ns  
  }  !e+^}s  
 } +A 4};]W|  
} 9`A}-YA !  
 rq[+p  
BOOL CHookApp::InitInstance() ^ #6Ei9di  
{ 5uVSbo.  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ,)S(SnCF  
 hins=AfxGetInstanceHandle(); cc*xHv^  
 InitHotkey(); kM#ZpI&0%  
 return CWinApp::InitInstance(); ;;A8TcE '  
} H pZD^h?L  
N"tEXb/,  
int CHookApp::ExitInstance() =54"9*  
{ )A@i2I  
 VerifyWindow(); /nbHin#we  
 UnInit(); -f{NVX\<0  
 return CWinApp::ExitInstance(); #RJFJb/  
}  QB/H  
9r5<A!1#L  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 2feiD?0  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ckglDhC  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ STr&"9c  
#if _MSC_VER > 1000 y;.U-}e1  
#pragma once Tlz $LI  
#endif // _MSC_VER > 1000 a*qf\ &Vb|  
I6jDRC0<  
class CCaptureDlg : public CDialog myR}~Cj;q  
{ 3I" <\M4x  
 // Construction ogOUrJ}P  
 public: `8.Oc;*zu  
  BOOL bTray; K}r@O"6*\  
  BOOL bRegistered; Po~u-5  
  BOOL RegisterHotkey(); J Uf{;nt  
  UCHAR cKey; +&U{>?.u  
  UCHAR cMask; ~O;'],#Co  
  void DeleteIcon(); i uNBw]  
  void AddIcon(); kVH^(Pi  
  UINT nCount; O%$XgEJ8p  
  void SaveBmp(); uB`H9  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor OYj4G ?c  
  // Dialog Data 7AOjlC9R}  
  //{{AFX_DATA(CCaptureDlg) #fuc`X3:HL  
  enum { IDD = IDD_CAPTURE_DIALOG }; "EE=j$8u+  
  CComboBox m_Key; $69ef[b  
  BOOL m_bControl; GC<zL }  
  BOOL m_bAlt; 8|*=p4_fn  
  BOOL m_bShift; e%B;8)7  
  CString m_Path; ,.g9HO/R1  
  CString m_Number; zRz7*o&l  
  //}}AFX_DATA ITq$8  
  // ClassWizard generated virtual function overrides _(TYR*  
  //{{AFX_VIRTUAL(CCaptureDlg) +FYQ7UE  
 public: 0Xke26ga  
  virtual BOOL PreTranslateMessage(MSG* pMsg); pYtvenBy  
 protected: }gfs  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JyfWy  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); opQ d ym  
  //}}AFX_VIRTUAL Gx$rk<;ZW  
  // Implementation FTA[O.tiG  
 protected: ,^>WC G  
  HICON m_hIcon; :J'ibb1  
  // Generated message map functions >o#^)LN  
  //{{AFX_MSG(CCaptureDlg) + pq/:h  
  virtual BOOL OnInitDialog(); V*|#j0}b  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %"1*,g{  
  afx_msg void OnPaint(); E2 5:e EXa  
  afx_msg HCURSOR OnQueryDragIcon(); p?#cn   
  virtual void OnCancel(); }'FNGn.~#  
  afx_msg void OnAbout(); ;`TSu5/  
  afx_msg void OnBrowse(); //ZYN2lT4  
  afx_msg void OnChange(); 4ZRE3^y\"  
 //}}AFX_MSG EZz`pE  
 DECLARE_MESSAGE_MAP() tSZd0G<A<o  
}; i;yr=S,a0/  
#endif p-6(>,+E[  
Qxvj`Ge  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Yy_o*Ozq  
#include "stdafx.h" n1Y3b~E?E  
#include "Capture.h" LMV0:\>  
#include "CaptureDlg.h" bay7%[BLB  
#include <windowsx.h> w(y#{!%+  
#pragma comment(lib,"hook.lib") :EX H8n&|  
#ifdef _DEBUG `D#3  
#define new DEBUG_NEW $?dAO}f3O)  
#undef THIS_FILE -quWnn/  
static char THIS_FILE[] = __FILE__; Tt0:rQ.  
#endif lF=l|.c  
#define IDM_SHELL WM_USER+1 kH)JBx.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); l9 K 3E<g  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); vfh0aW-O  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; HfF4BQxm  
class CAboutDlg : public CDialog rQ4i%.  
{ 0B4&!J  
 public: [\j@_YYd  
  CAboutDlg(); w'Kc#2  
  // Dialog Data wR"4slY_%  
  //{{AFX_DATA(CAboutDlg) V<#E!MG  
  enum { IDD = IDD_ABOUTBOX }; wc-ll&0Z  
  //}}AFX_DATA Ul<'@A8  
  // ClassWizard generated virtual function overrides h%hE$2  
  //{{AFX_VIRTUAL(CAboutDlg) L?@ TF;  
 protected: A5lP%&tu(  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .45XS>=z#  
  //}}AFX_VIRTUAL Ozygr?*X  
  // Implementation 9}4EW4  
 protected: sH^?v0^a  
  //{{AFX_MSG(CAboutDlg) . k6)  
  //}}AFX_MSG "! yKX(aTX  
  DECLARE_MESSAGE_MAP() 4LCgQS6  
}; "hRY+{m  
T4W"!4[  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) j15TavjGh  
{ :Rs% (Z  
 //{{AFX_DATA_INIT(CAboutDlg) E0nR Vg  
 //}}AFX_DATA_INIT CIM 9~:\  
} I6]|dA3G  
bb6 ~H  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) _{EO9s2FG  
{ u5f+%!p  
 CDialog::DoDataExchange(pDX); (1bz.N8z  
 //{{AFX_DATA_MAP(CAboutDlg) dYg}qad5:  
 //}}AFX_DATA_MAP XFeeNcqF  
} XA[G F6W,Y  
q\qV~G`  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $jYwV0  
 //{{AFX_MSG_MAP(CAboutDlg) ~&/|J)}  
 // No message handlers K>kMKd1  
 //}}AFX_MSG_MAP ]Q\Ogfjp  
END_MESSAGE_MAP() gT K5z.]  
jafq(t  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) TQ? D*&  
: CDialog(CCaptureDlg::IDD, pParent) +$)C KC  
{ qYg4H|6  
 //{{AFX_DATA_INIT(CCaptureDlg) U! F~><  
  m_bControl = FALSE; p}KZ#"Q  
  m_bAlt = FALSE; w;.'>ORC  
  m_bShift = FALSE; (~oUd 4  
  m_Path = _T("c:\\"); \TG!M]D:  
  m_Number = _T("0 picture captured."); l`2X'sw[/  
  nCount=0; 29"eu#-Qj  
  bRegistered=FALSE; ?Z@FxW  
  bTray=FALSE; W{Cc wq  
 //}}AFX_DATA_INIT r}i<cyL  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 pRtxyL"y  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); "(}xIsy  
} O)MKEMuA  
0(s0<9s%  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) -OpI,qyS  
{  Z*d8b  
 CDialog::DoDataExchange(pDX); c=l 3Sz?  
 //{{AFX_DATA_MAP(CCaptureDlg) n4%|F'ma  
  DDX_Control(pDX, IDC_KEY, m_Key); a z 7Vy-  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 7?K?-Oj  
  DDX_Check(pDX, IDC_ALT, m_bAlt); R@``MC0  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ~R.8r-kD`  
  DDX_Text(pDX, IDC_PATH, m_Path); xm>RLx}9  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 8uoFV=bj\  
 //}}AFX_DATA_MAP &0Zn21q  
} <@n/[ +3  
> _U)=q  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) (US]e un  
//{{AFX_MSG_MAP(CCaptureDlg) KO(+%>^R  
 ON_WM_SYSCOMMAND() ]Ff"o7gT  
 ON_WM_PAINT() 'v4#mf  
 ON_WM_QUERYDRAGICON() SU"-%}~O#,  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Q7$ILW-S  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) )W'l^R4W  
 ON_BN_CLICKED(ID_CHANGE, OnChange) vm)&WEL!  
//}}AFX_MSG_MAP _`WbR&d2Id  
END_MESSAGE_MAP() 9|T%q2O  
#NVtZs!V/  
BOOL CCaptureDlg::OnInitDialog() .ag4i;hS8  
{ Pze$QBNoRd  
 CDialog::OnInitDialog(); $rDeI-)S  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); KotJ,s]B  
 ASSERT(IDM_ABOUTBOX < 0xF000); JwbC3 t):@  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .]%PnJM9K  
 if (pSysMenu != NULL) JxI}#iA  
 { ^jb55X}  
  CString strAboutMenu; $ud5bT{n  
  strAboutMenu.LoadString(IDS_ABOUTBOX); C$\|eC j  
  if (!strAboutMenu.IsEmpty()) .ps'{rl8  
  { ;rpjXP  
   pSysMenu->AppendMenu(MF_SEPARATOR); Nh~ Hh(   
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); i$)bZr\  
  } 0\%/:2   
 } h@FDP#H  
 SetIcon(m_hIcon, TRUE); // Set big icon "K`B'/08^  
 SetIcon(m_hIcon, FALSE); // Set small icon zcD&xoL\H  
 m_Key.SetCurSel(0); =6imrRaaV  
 RegisterHotkey(); n'0^l?V  
 CMenu* pMenu=GetSystemMenu(FALSE); z71.5n!C  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); oC>e'_6_b  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7 2ux3D  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); r#*kx#"  
 return TRUE; // return TRUE unless you set the focus to a control n>jb<uz  
} 4&)*PKq  
%TdZ_  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) mq$'\c 9.  
{ z`((l#(  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) mJRvC%  
 { M4pE wD  
  CAboutDlg dlgAbout; `C`CU?D  
  dlgAbout.DoModal(); C_=! ( @`8  
 } fLL_{o0T  
 else gxpR#/(E~  
 { \-N 4G1  
  CDialog::OnSysCommand(nID, lParam); 1Vt7[L*  
 } !p4w 8  
} br+{23&1R#  
/J`8Gk59  
void CCaptureDlg::OnPaint() 6ND,4'6  
{ &Qy_= -]  
 if (IsIconic()) -fuSCj  
 { 5i7,s  
  CPaintDC dc(this); // device context for painting A:ls'MkZ4  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); [c]X) @#S  
  // Center icon in client rectangle 16)@<7b]J  
  int cxIcon = GetSystemMetrics(SM_CXICON); mb~w .~%  
  int cyIcon = GetSystemMetrics(SM_CYICON); lZZ4 O(  
  CRect rect; E{sTxO I$  
  GetClientRect(&rect); XWZ *{/u  
  int x = (rect.Width() - cxIcon + 1) / 2; o!^':mll  
  int y = (rect.Height() - cyIcon + 1) / 2; p>h B&h  
  // Draw the icon HS.3PE0^C  
  dc.DrawIcon(x, y, m_hIcon); xz[a3In+  
 } YuSe~~F)j  
 else EC$wi|i  
 { r<cyxR~  
  CDialog::OnPaint(); :M9'wg  
 } )Xg,;^  
} e5maZ(.;F  
]H0BUg  
HCURSOR CCaptureDlg::OnQueryDragIcon() 2+ F34  
{ E9HA8  
 return (HCURSOR) m_hIcon; n?_!gqK  
} }legh:/*?O  
YW9 [^  
void CCaptureDlg::OnCancel() / *xP`'T  
{ dN\Byl(6  
 if(bTray) frbKi _1  
  DeleteIcon(); |lOxRUf~  
  CDialog::OnCancel(); 5t#+UR  
} &G7JGar  
"{105&c\  
void CCaptureDlg::OnAbout() SdBv?`u|g  
{ Enm#\(j  
 CAboutDlg dlg; 6 /gh_'&  
 dlg.DoModal(); _HX 1E  
} `4__X;  
vt<r_&+ pJ  
void CCaptureDlg::OnBrowse() {[hH: \  
{ D% } ?l  
 CString str; v+f:VA  
 BROWSEINFO bi; o0^..f  
 char name[MAX_PATH]; 6js94ko[  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Wk"4mq  
 bi.hwndOwner=GetSafeHwnd(); ?r0#{x~  
 bi.pszDisplayName=name; /:d03N\9k  
 bi.lpszTitle="Select folder"; h 1G`z  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Er^ijh,  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); LvgNdVJDP|  
 if(idl==NULL) zQM3n =y  
  return; kmPK |R  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ~Z!!wDHS  
 str.ReleaseBuffer(); }Iz'#I Xx  
 m_Path=str; GY,l&.&  
 if(str.GetAt(str.GetLength()-1)!='\\') L ?g|:  
  m_Path+="\\"; -jnx0{/  
 UpdateData(FALSE); T{3C3EE?]  
} 4V9DPBh  
U.is:&]E  
void CCaptureDlg::SaveBmp() 3 XdN \xc  
{ ,0%P3  
 CDC dc; Wm$( b2t  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); uSCF;y=1g,  
 CBitmap bm; aKXaor@0f.  
 int Width=GetSystemMetrics(SM_CXSCREEN); 6*cG>I.Z  
 int Height=GetSystemMetrics(SM_CYSCREEN); H_KE^1  
 bm.CreateCompatibleBitmap(&dc,Width,Height); QLrFAV  
 CDC tdc; Yn4c6K  
 tdc.CreateCompatibleDC(&dc); \9;u.&$mNB  
 CBitmap*pOld=tdc.SelectObject(&bm); ;> **+ezF  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); zM{'GB+en  
 tdc.SelectObject(pOld); oV utHt  
 BITMAP btm; g3Q]W(F%$  
 bm.GetBitmap(&btm); hNs970i  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; p>4$&-  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); yzr>]"o  
 BITMAPINFOHEADER bih; x'kwk  
 bih.biBitCount=btm.bmBitsPixel; \U;4 \  
 bih.biClrImportant=0; {vYmK#}  
 bih.biClrUsed=0; ktLXL;~X  
 bih.biCompression=0; 834(kw+#9  
 bih.biHeight=btm.bmHeight; | n5F_RL  
 bih.biPlanes=1; WGjT06a\  
 bih.biSize=sizeof(BITMAPINFOHEADER); 4<._)_m  
 bih.biSizeImage=size; H?98^y7  
 bih.biWidth=btm.bmWidth; Gc2sY 0  
 bih.biXPelsPerMeter=0; Rr ! PU  
 bih.biYPelsPerMeter=0; 3|zqEGT*  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); f"t\-ux.b  
 static int filecount=0; 7uG@ hL36  
 CString name; C{>@b:]p  
 name.Format("pict%04d.bmp",filecount++); hNBv|&D#  
 name=m_Path+name; {wMw$Fvf  
 BITMAPFILEHEADER bfh; 9 2_F8y*D  
 bfh.bfReserved1=bfh.bfReserved2=0; YSwAu,$jf  
 bfh.bfType=((WORD)('M'<< 8)|'B'); wuE]ju<  
 bfh.bfSize=54+size; h<H.8.o  
 bfh.bfOffBits=54; #- $?2?2  
 CFile bf; !GI*R2<W  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #g[jwl'  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); (7BG~T  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); N %N %  
  bf.WriteHuge(lpData,size); N: 'v^0  
  bf.Close(); fkE4 [X7f  
  nCount++; 3a PCi>i!_  
 } #(& ! ^X3  
 GlobalFreePtr(lpData); 'Lu7cb^  
 if(nCount==1) m[ *)sm  
  m_Number.Format("%d picture captured.",nCount); K  +n  
 else 5=%:CN!/@p  
  m_Number.Format("%d pictures captured.",nCount); MMg"G6?  
  UpdateData(FALSE); K3*8JF7_F  
} q[p+OpA  
*i zPLM}+  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ({ 'I;]AQ  
{ :0 G "EM4  
 if(pMsg -> message == WM_KEYDOWN) x95[*[  
 { M{I8b<hY  
  if(pMsg -> wParam == VK_ESCAPE) am,UUJ+h>  
   return TRUE; -w nlJi1f  
  if(pMsg -> wParam == VK_RETURN) J J@O5  
   return TRUE; gwE#,OY*  
 } $YuVM  
 return CDialog::PreTranslateMessage(pMsg); 4i0~t~vDpr  
} @+II@[ _lT  
1{@f:~v?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ozN#LIM>P  
{ ,ErJUv  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 0'u2xe  
  SaveBmp(); 4AdZN5  
  return FALSE; ELoE-b)Cb  
} $1<V'b[E  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Zp'c>ty=  
 CMenu pop; 5bU[uT,`6  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); mlC_E)Ed5  
 CMenu*pMenu=pop.GetSubMenu(0); BR\3ij  
 pMenu->SetDefaultItem(ID_EXITICON); N-* ^V^V  
 CPoint pt; ={& }8VA  
 GetCursorPos(&pt); p)l>bC?3  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); M$&aNt;  
 if(id==ID_EXITICON) <P&~k\BuF{  
  DeleteIcon(); E__^>=  
 else if(id==ID_EXIT) WrvSYqN  
  OnCancel(); (p4|,\+  
 return FALSE; \uxDMKy  
} "fWAp*nI3t  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); (!kd9uV  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 9MfBsp}c  
 AddIcon(); 5IOMc 4v  
 return res; ^6&?R?y  
} #$q~ZKB  
bvHF;Qywg  
void CCaptureDlg::AddIcon() ul0]\(sS:  
{ Vgy}0pCl  
 NOTIFYICONDATA data; E.*TJ  
 data.cbSize=sizeof(NOTIFYICONDATA); bvyX(^I[q  
 CString tip; Glz)-hjJ:n  
 tip.LoadString(IDS_ICONTIP); GilaON*pK.  
 data.hIcon=GetIcon(0); @C[]o.r  
 data.hWnd=GetSafeHwnd(); j2GO ZKy  
 strcpy(data.szTip,tip); pfd||Z  
 data.uCallbackMessage=IDM_SHELL; _86pbr9  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 5Fh?YS=  
 data.uID=98; RmXC ^VQ  
 Shell_NotifyIcon(NIM_ADD,&data); l :sZ  
 ShowWindow(SW_HIDE); ?UD2}D[M  
 bTray=TRUE; "[ f"h  
} A2Je*Gz  
AhjK*nJF  
void CCaptureDlg::DeleteIcon() 1J8okBhZ  
{ JNY;;9o  
 NOTIFYICONDATA data; dWR0tS6vR`  
 data.cbSize=sizeof(NOTIFYICONDATA); $nR1AOm}.B  
 data.hWnd=GetSafeHwnd(); p3?!}VM!y  
 data.uID=98; C>%2'S^.b  
 Shell_NotifyIcon(NIM_DELETE,&data); k-;%/:Om  
 ShowWindow(SW_SHOW); }e}J6 [wP  
 SetForegroundWindow(); Mm7l!  
 ShowWindow(SW_SHOWNORMAL); &,?bX])  
 bTray=FALSE; }9n{E-bj*  
} #qL?;Zh0S  
wps`2`z  
void CCaptureDlg::OnChange() Jw%0t'0Zi  
{ XXuIWIhm  
 RegisterHotkey(); (1.E9+MquU  
} VCOz?Y*  
h.\V;6ly  
BOOL CCaptureDlg::RegisterHotkey() pk&kJ307  
{ 9 *>@s  
 UpdateData(); KA)9&6  
 UCHAR mask=0; , sEu[m  
 UCHAR key=0; ;{Cr+lqTJ  
 if(m_bControl) 1r6>.&p  
  mask|=4; cID{X&or  
 if(m_bAlt) +5n,/YjS`  
  mask|=2; 5GD6%{\O  
 if(m_bShift) j^DoILw  
  mask|=1; J }?F4  
  key=Key_Table[m_Key.GetCurSel()]; jq6BwUN  
 if(bRegistered){ ,xA`Fu9^  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); BR1oE3in  
  bRegistered=FALSE; a]NQlsE}l  
 } -phwzR\(t  
 cMask=mask; b!W!Vvf^x  
 cKey=key; FJ}RT*7_C  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); v-`RX;8  
 return bRegistered; \!HG kmd  
} V=!tZ[4z$h  
N(<4nAE  
  四、小结 _yje"  
^l\U6$3  
  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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