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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: kxCSs7J/  
  JGZBL{8  
  一、实现方法 n"8Yv~v*2j  
EX"yxZ~  
  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: ^rz_f{c]-  
n{jGOfc  
#pragma data_seg("shareddata") "  1tH  
HHOOK hHook =NULL; //钩子句柄 >mkFV@`  
UINT nHookCount =0; //挂接的程序数目 jWgX_//!  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 H/Jbk*Q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 +|f@^-  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ?A0)L27UE&  
static int KeyCount =0; O0:q;<>z  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 |BYRe1l6l  
#pragma data_seg() ykJ>*z  
$Kd>:f=A  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 7$#u  
UZ";a453r  
  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: xx $cnG  
BLFdHB.$T  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 8,|kao:  
cKey,UCHAR cMask) I 6O  
{ ';"VDLb3  
 BOOL bAdded=FALSE; MOC/KNb  
 for(int index=0;index<MAX_KEY;index++){ YZ7.1`8  
  if(hCallWnd[index]==0){ =lSNs   
   hCallWnd[index]=hWnd; j1Ezf=N6`  
   HotKey[index]=cKey; 4z)]@:`}z  
   HotKeyMask[index]=cMask; {[F A#  
   bAdded=TRUE; a.Vuu)+Quw  
   KeyCount++; h`KU\X ) A  
   break; }a/Cro.~4  
  } ;a3}~s  
 } |a@L}m  
 return bAdded; 0{mex4  
} Zd&S@Z  
//删除热键 ?cZlN !  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [Qr"cR^  
{ !m$jk2<  
 BOOL bRemoved=FALSE; ,,TnIouy  
 for(int index=0;index<MAX_KEY;index++){ qP;OaM CX  
  if(hCallWnd[index]==hWnd){ W3RT{\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *ui</+  
    hCallWnd[index]=NULL; 6B-16  
    HotKey[index]=0; t,' <gI  
    HotKeyMask[index]=0; JtZ7ti  
    bRemoved=TRUE; 5-M-X#(  
    KeyCount--; AwN!;t_0+N  
    break; !'Kj x  
   } LQ% `c  
  } t<qiGDJ<d  
 } nFn5v'g  
 return bRemoved; N g,j#  
} }7X%'Bg=M  
5 dg(e3T  
>d6|^h'0  
  DLL中的钩子函数如下: adw2x pj  
4+ig' |o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {Ha57Wk8D  
{ M3AXe]<eC1  
 BOOL bProcessed=FALSE; Pc9H0\+Xk  
 if(HC_ACTION==nCode) zreU')a  
 { @PU [:;  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 PW4q~rc=:  
   switch(wParam) 0$njMnB2l  
   {  SX*RP;vHy  
    case VK_MENU: gZ5 |UR<  
     MaskBits&=~ALTBIT; v>56~AJ  
     break; svSVG:48  
    case VK_CONTROL: /O9EQPm(  
     MaskBits&=~CTRLBIT; KmF]\:sMD  
     break; ;G!q Y  
    case VK_SHIFT: cZ06Kx..  
     MaskBits&=~SHIFTBIT; W8<%[-r  
     break; %$mA03[MQ  
    default: //judge the key and send message ZB{EmB0W  
     break; liSmjsk  
   } =Sv/IXX\di  
   for(int index=0;index<MAX_KEY;index++){ <uJ@:oWG7  
    if(hCallWnd[index]==NULL) |g~ZfnP_%  
     continue; \DzGQ{`~m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `x|?&Ytmf9  
    { +n)9Tz5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (#'>(t(4  
     bProcessed=TRUE; <}LC~B!  
    } ;PH~<T  
   } #1[u (<AS  
  } =QsYXK7Mn4  
  else if((lParam&0xc000ffff)==1){ //有键按下 o}!PQ#`M  
   switch(wParam) a9G8q>h]O  
   { 4m)n+ll  
    case VK_MENU: [gB+C84%%  
     MaskBits|=ALTBIT; F\! `/4  
     break; {8aTV}Ha2  
    case VK_CONTROL: B1STGL`nK  
     MaskBits|=CTRLBIT; l^qI, M  
     break; _j3fAr(V  
    case VK_SHIFT: |{8Pb3#U  
     MaskBits|=SHIFTBIT; M_8{]uo  
     break; {8OCXus3m  
    default: //judge the key and send message M}Sv8D]I  
     break; 7 3m1  
   } f<H2-(m  
   for(int index=0;index<MAX_KEY;index++){ yjAL\U7`T  
    if(hCallWnd[index]==NULL) 7L??ae  
     continue; ]-q;4.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #F#%`Rv1  
    { ]tD]Wx%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); v1[29t<I!  
     bProcessed=TRUE; XRH!]!  
    } OY d !v`<  
   }  `]X>V,  
  } +0~YP*I`/  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 d5.4l&\u  
   for(int index=0;index<MAX_KEY;index++){ 2|L&DF:G  
    if(hCallWnd[index]==NULL) PdCEUh\>y  
     continue; 9my^ Y9B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) q7!{?\T%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ] @'!lhLi  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 xU vs:  
   } 99S ^f:t  
  } w &(ag$p'  
 } j F>[?L  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); . ^u,.  
} ;I*o@x_  
Ei|\3Kx  
  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: ]q.0!lh+WL  
ZEQEx]Y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s>en  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H.c7Nle  
/B3iC#?  
  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: G"6 !{4g  
O}P`P'Y|'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *fdTpXa  
{ KP"+e:a%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Rv=YFo[B  
 { ;,TFr}p`  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Th%zn2R B  
  SaveBmp(); >V937  
  return FALSE; yuVs YV@"  
 } GmG 5[?)  
 …… //其它处理及默认处理  <Uur^uB  
} y(&Ac[foS}  
6mE\OS-I  
y2v^-q3  
  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。 iwq!w6+  
F:VIzyMq<  
  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。 GeqPRah  
:Al!1BJQ  
  二、编程步骤 ;j7#7MN2_E  
p'k0#R$  
  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"; (mOtU8e  
dveiQ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 5\v3;;A[  
: +u]S2u{  
  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; @co S+t  
~[ F`"  
  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; [m -bV$-d  
\GBuWY3B  
  5、 添加代码,编译运行程序。 [RL9>n8f  
S @Y39  
三、程序代码 7nSxi+6e  
fOHxtHM  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 5N]"~w*  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9^x> 3Bo  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ KXrjqqXs  
#if _MSC_VER > 1000 Z,=1buSz_  
#pragma once k!^{eOM  
#endif // _MSC_VER > 1000 K@2),(z  
#ifndef __AFXWIN_H__ Fcx&hj1gQ  
#error include 'stdafx.h' before including this file for PCH ^pS~Z~[d/  
#endif jo7\`#(Q  
#include "resource.h" // main symbols t:S+%u U  
class CHookApp : public CWinApp gr{ DWCK  
{ =AT."$r>  
 public: So6x"1B  
  CHookApp(); IgzQr >  
  // Overrides 3R/bz0 V>  
  // ClassWizard generated virtual function overrides 'R)Tn!6  
  //{{AFX_VIRTUAL(CHookApp) NHt\ U9l'  
 public: rjP/l6 ~'  
  virtual BOOL InitInstance(); 0_/[k*Re  
  virtual int ExitInstance(); lYIH/:T  
  //}}AFX_VIRTUAL `XKLU  
  //{{AFX_MSG(CHookApp) iCoX& "lb  
  // NOTE - the ClassWizard will add and remove member functions here. "tZe>>I  
  // DO NOT EDIT what you see in these blocks of generated code ! e.%nRhSs3  
  //}}AFX_MSG 8|^7ai[am  
  DECLARE_MESSAGE_MAP() y7{?Ip4[  
}; AX INThJ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ]|@^1we  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); l]vm=7:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _aphkeqd  
BOOL InitHotkey(); xk5 ]^yDp  
BOOL UnInit(); _{>vTBU4F  
#endif wL1MENzp*z  
("@!>|H  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Y2TtY;  
#include "stdafx.h" ,6/V" kqIP  
#include "hook.h" B?QIN]  
#include <windowsx.h> s.rm7r@ #  
#ifdef _DEBUG b>W %t  
#define new DEBUG_NEW s"|Pdc4  
#undef THIS_FILE V#HuIgf-  
static char THIS_FILE[] = __FILE__; \['Cj*ek  
#endif / FII07V  
#define MAX_KEY 100 #_1`)VS  
#define CTRLBIT 0x04 )BE1Q*= n  
#define ALTBIT 0x02 '"^'MXa  
#define SHIFTBIT 0x01 (:_$5&i7  
#pragma data_seg("shareddata") hp2t"t  
HHOOK hHook =NULL; 965 jtn  
UINT nHookCount =0; kstIgcI  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey b>|6t~}M  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 3Vwh|1?  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey l} /F*  
static int KeyCount =0; hxx.9x>ow  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift K9[UB  
#pragma data_seg() "Q0@/bYq  
HINSTANCE hins; Gt1U!dP  
void VerifyWindow(); PCvWS.{  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ! if   
//{{AFX_MSG_MAP(CHookApp) <%d>v-=B  
// NOTE - the ClassWizard will add and remove mapping macros here. b}f~il  
// DO NOT EDIT what you see in these blocks of generated code! SBpL6~NW  
//}}AFX_MSG_MAP \zY!qpX<  
END_MESSAGE_MAP() O^.#d  
~&T~1xsFJ  
CHookApp::CHookApp() 8}[).d160  
{ XX@ZQcN  
 // TODO: add construction code here, T%Lx%Qn  
 // Place all significant initialization in InitInstance .>S!ji  
} Ba,`TJ%y  
eRYK3W  
CHookApp theApp; \RiP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) _-D{-Bu#  
{ j.Hf/vi`z  
 BOOL bProcessed=FALSE; +0&/g&a\R  
 if(HC_ACTION==nCode) osRy e3  
 { 2T35{Q!=F  
  if((lParam&0xc0000000)==0xc0000000){// Key up p?!/+  
   switch(wParam) . vV|hSc  
   { |=w@H]r  
    case VK_MENU: Ulyue  
     MaskBits&=~ALTBIT; = &]L00u.  
     break; h\o.&6sd  
    case VK_CONTROL: G2D$aSh  
     MaskBits&=~CTRLBIT; ,hVli/  
     break; x4 yR8n(  
    case VK_SHIFT: $X6h|?3U,  
     MaskBits&=~SHIFTBIT; }pYqWTG  
     break; >j/w@Fj  
    default: //judge the key and send message f?Lw)hMrA  
     break; ;'|Ey  
   } l;Wj]  
   for(int index=0;index<MAX_KEY;index++){ `Oa WGZ[  
    if(hCallWnd[index]==NULL) ~a:  
     continue; Oz95  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rH-23S  
    { NOva'qk  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %Zi} MPx  
     bProcessed=TRUE; p'%s=TGwv  
    } WE?5ehEme  
   } ]/Pn EU[  
  } fex@,I&  
  else if((lParam&0xc000ffff)==1){ //Key down f8~_E  
   switch(wParam) W4S,6(  
   { <YY14p  
    case VK_MENU: >Ry01G]_/h  
     MaskBits|=ALTBIT; $mILoy B,  
     break; !zo{tI19  
    case VK_CONTROL: a9gLg &  
     MaskBits|=CTRLBIT; CrLrw T  
     break; 3S{ />1Y  
    case VK_SHIFT: ";F'~}bDA  
     MaskBits|=SHIFTBIT; C_Dn{  
     break; ;+%rw2Z,B  
    default: //judge the key and send message t0S 1QC+  
     break; Cy e.gsCT  
   } z_HdISy0  
   for(int index=0;index<MAX_KEY;index++) w{KavU5W  
   { Hka2  
    if(hCallWnd[index]==NULL) L,\Iasv  
     continue; \hXDO_U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I,tud!p`  
    { { FkF  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ^W ^OfY  
     bProcessed=TRUE; /wp6KXm  
    } `3pW]&  
   } 'DR!9De  
  } eFgA 8kY)  
  if(!bProcessed){ c)J%`i$  
   for(int index=0;index<MAX_KEY;index++){ ;u JMG  
    if(hCallWnd[index]==NULL) 7! Nsm  
     continue; It(_v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #"!<W0  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); TH;hO).u  
   } TOt dUO  
  } & 21%zPm  
 } ]kSGR  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); L0,'mS  
} 2G7Wi!J  
&d!GImcxQ  
BOOL InitHotkey() >Tgv11[  
{ ll^#JpT[S  
 if(hHook!=NULL){ 7.Op<  
  nHookCount++; <E~'.p,  
  return TRUE; X'srL j.  
 } dV_G1'  
 else 23PGq%R  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); **%37  
  if(hHook!=NULL) kVgTGC"L=  
   nHookCount++; "jZ-,P=  
  return (hHook!=NULL); fhiM U8(&  
} V gWRW7Se  
BOOL UnInit() Ml_^ `vn  
{ ?s01@f#  
 if(nHookCount>1){ [,Gg^*umS  
  nHookCount--; (QEG4&9  
  return TRUE; 6x`t{g]f,  
 } QRUz`|U  
 BOOL unhooked = UnhookWindowsHookEx(hHook); [0!(xp^  
 if(unhooked==TRUE){ J1k>07}|  
  nHookCount=0; ftb\0,-   
  hHook=NULL; )9g2D`a4  
 } i1UsIT  
 return unhooked; zhQJy?>'m  
} h p1Bi  
<'u'#E@"sl  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) X'ag)|5ot  
{ Dt@SqX:~Ee  
 BOOL bAdded=FALSE; Nn6%9PX_)  
 for(int index=0;index<MAX_KEY;index++){ kiEa<-]  
  if(hCallWnd[index]==0){ {7[Ox<Ho  
   hCallWnd[index]=hWnd; Jy)/%p~  
   HotKey[index]=cKey; O.? JmE  
   HotKeyMask[index]=cMask; Gc?a+T  
   bAdded=TRUE; _BufO7 `.  
   KeyCount++; K(4_a``05  
   break; 5BIY<B+i  
  } U^PgG|0N  
 } dtDFoETz  
 return bAdded; /ZX }Nc g  
} 6ujW Nf  
I9^x,F"E]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &oNAv-m^GD  
{ Z,gk|M3.  
 BOOL bRemoved=FALSE; wYea\^co  
 for(int index=0;index<MAX_KEY;index++){  mh%VrA q  
  if(hCallWnd[index]==hWnd){ b%+Xy8a  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ a?1Wq  
    hCallWnd[index]=NULL; KI.unP%  
    HotKey[index]=0; *. t^MP  
    HotKeyMask[index]=0; W?& %x(6M  
    bRemoved=TRUE; xT8?&Bx  
    KeyCount--; iZmcI;?u  
    break; =pNY eR_[  
   } UKGPtKE<  
  } *~`(RV  
 } h[ ZN+M  
 return bRemoved; CpN>p.kM  
} Wwo0%<2y  
e-;}366}  
void VerifyWindow() JF]JOI6.e  
{ sO Y:e/_F  
 for(int i=0;i<MAX_KEY;i++){ l/D} X  
  if(hCallWnd!=NULL){ ;uW FHc5@B  
   if(!IsWindow(hCallWnd)){ i b m4fa  
    hCallWnd=NULL; xdPx{"C 3  
    HotKey=0; :RYTL'hes  
    HotKeyMask=0; P?<y%c<  
    KeyCount--; 7<4qQ.deE  
   } _1^'(5f$  
  } crCJrN=  
 } \8tsDG(1 '  
} H,J8M{  
)7@0[>  
BOOL CHookApp::InitInstance() )oZ dj`  
{ "@kaHIf[  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); f$( e\+ +  
 hins=AfxGetInstanceHandle(); 6!o1XQr=Z  
 InitHotkey(); hTkyz la  
 return CWinApp::InitInstance(); jPeYmv]  
} <@}9Bid!o  
al0L&z\  
int CHookApp::ExitInstance() jIyQ]:*p  
{ Kw}'W 8`c  
 VerifyWindow(); nN;u,}e  
 UnInit(); zs;JJk^  
 return CWinApp::ExitInstance(); a*;b^Ze`v  
} ?2a$*(  
yZ:qU({KhD  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file iso4]>LF  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) @HW*09TG  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Efe 7gE'  
#if _MSC_VER > 1000 & kIFcd@  
#pragma once }u|q0>^8  
#endif // _MSC_VER > 1000 $]1=\ I  
6*?F@D2&  
class CCaptureDlg : public CDialog $>gFf}#C  
{ E^PB)D(.  
 // Construction eyaNs{TV  
 public: llDJ@  
  BOOL bTray; 8t`?#8D}  
  BOOL bRegistered; 0x7'^Z>-oe  
  BOOL RegisterHotkey(); $kgVa^  
  UCHAR cKey; NA*&#X#~  
  UCHAR cMask; l6B@qYLZ  
  void DeleteIcon(); 3 $w65=  
  void AddIcon(); ^aQ"E9  
  UINT nCount; g}i61(  
  void SaveBmp(); ]_Xlq_[/r  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Vi}_{ Cy  
  // Dialog Data V :eD]zq5  
  //{{AFX_DATA(CCaptureDlg) ;jPXs  
  enum { IDD = IDD_CAPTURE_DIALOG }; Ymgw-NJ;(  
  CComboBox m_Key; ,Q,^3*HX9}  
  BOOL m_bControl;  OSJ$d  
  BOOL m_bAlt; 51u0]Qx;fm  
  BOOL m_bShift; !BI;C(,RL  
  CString m_Path; l,: F  
  CString m_Number; l~.-e^p?  
  //}}AFX_DATA _m>b2I?  
  // ClassWizard generated virtual function overrides "L1Zi.)  
  //{{AFX_VIRTUAL(CCaptureDlg) d3Rw!slIq  
 public: ':W[A  
  virtual BOOL PreTranslateMessage(MSG* pMsg); HDKbF/  
 protected: P4?glh q#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ddo#P%sH'  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -N@|QK>  
  //}}AFX_VIRTUAL -/k 3a*$/  
  // Implementation 5r_|yu  
 protected: D0C y^_  
  HICON m_hIcon;  IB<d  
  // Generated message map functions t Pf40`@  
  //{{AFX_MSG(CCaptureDlg) fh{`Mz,o  
  virtual BOOL OnInitDialog(); q;U,s)Uz^  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 9kojLqCT  
  afx_msg void OnPaint(); 7KPwQ?SjT  
  afx_msg HCURSOR OnQueryDragIcon(); 3F0 N^)@  
  virtual void OnCancel(); V1?]|HTQcT  
  afx_msg void OnAbout(); ccnK#fn v  
  afx_msg void OnBrowse(); [Yyk0Qv|4  
  afx_msg void OnChange(); l@\FWWQ  
 //}}AFX_MSG Tr|JYLwF  
 DECLARE_MESSAGE_MAP() *kVV+H<X|b  
}; b\ PgVBf9  
#endif @KA4N`  
V:27)]q  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ]~%6JJN7  
#include "stdafx.h" jtc~DL  
#include "Capture.h" K>9 ()XT)  
#include "CaptureDlg.h" fatf*}eln  
#include <windowsx.h> >MK98(F  
#pragma comment(lib,"hook.lib") {U1m.30n  
#ifdef _DEBUG *J{+1Ev~$p  
#define new DEBUG_NEW Q^I\cAIB  
#undef THIS_FILE a6H%5N  
static char THIS_FILE[] = __FILE__; ,P Z ge  
#endif BC]?0 U  
#define IDM_SHELL WM_USER+1 x:7IIvP  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {|\.i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8] ikygt"  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; J=L5=G7(  
class CAboutDlg : public CDialog '!$%> ||S  
{ qa6,z.mQ  
 public: >{Tm##@,k  
  CAboutDlg(); )jC%a6G!  
  // Dialog Data Ha#>G<;n  
  //{{AFX_DATA(CAboutDlg) WKU=.sY  
  enum { IDD = IDD_ABOUTBOX }; SB7c.H,  
  //}}AFX_DATA >Se,;cB'/]  
  // ClassWizard generated virtual function overrides T)CP2U  
  //{{AFX_VIRTUAL(CAboutDlg) +*^H#|!  
 protected: }-fl$j?9E  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support " Jr-J#gg  
  //}}AFX_VIRTUAL &[SC|=U'M  
  // Implementation kN>!2UfNS  
 protected: `"~%bS  
  //{{AFX_MSG(CAboutDlg) QM]YJr3r E  
  //}}AFX_MSG @P" p+  
  DECLARE_MESSAGE_MAP() G\?YK.Y>  
}; Z6pUZ[j,  
Bj~+WwD)QR  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 8Eq7Sa  
{ EzIGz[  
 //{{AFX_DATA_INIT(CAboutDlg) i  LAscb  
 //}}AFX_DATA_INIT TPY}C  
} rbpSg7}Q  
:ivf/x n  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) j=J/x:w_e  
{ ?rIx/>C9  
 CDialog::DoDataExchange(pDX); g ci    
 //{{AFX_DATA_MAP(CAboutDlg) 0^ibNiSP  
 //}}AFX_DATA_MAP '\GbmD^F  
} &=Wlaa/,&  
KdlQ!5(?X  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) LDD|(KLR*.  
 //{{AFX_MSG_MAP(CAboutDlg) UDni]P!E  
 // No message handlers l+R+&b^  
 //}}AFX_MSG_MAP @o6L6Y0Naa  
END_MESSAGE_MAP() q]M0md  
^H' \"9;7  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) p^_yU_  
: CDialog(CCaptureDlg::IDD, pParent)  kwA$Z!Rn  
{ {GO#.P"  
 //{{AFX_DATA_INIT(CCaptureDlg) MWL% Bz  
  m_bControl = FALSE; 9mFE?J  
  m_bAlt = FALSE; 63A.@mL  
  m_bShift = FALSE; X$pJ :M{F$  
  m_Path = _T("c:\\"); \15nS B  
  m_Number = _T("0 picture captured."); {V-v-f  
  nCount=0; `p7=t)5k  
  bRegistered=FALSE; V!dtF,tH  
  bTray=FALSE; 5D l/aHb  
 //}}AFX_DATA_INIT 2|bn(QYz  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 iyp=lLk  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); yA>nli=  
} z~Q>V]a>;  
LD g?'y;2  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) LrK,_)r:~  
{ T5:G$-qL(  
 CDialog::DoDataExchange(pDX); l\?c}7k  
 //{{AFX_DATA_MAP(CCaptureDlg) [h:T*(R?  
  DDX_Control(pDX, IDC_KEY, m_Key); ]d%8k}U  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); +H Usz ?  
  DDX_Check(pDX, IDC_ALT, m_bAlt); "}JZU!?  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 6x|jPb  
  DDX_Text(pDX, IDC_PATH, m_Path); $pudoAO  
  DDX_Text(pDX, IDC_NUMBER, m_Number); }{< '8J.R  
 //}}AFX_DATA_MAP So 5N5,u@=  
} i@ BtM9:  
U3:j'Su4H?  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) [=_jYzD,j|  
//{{AFX_MSG_MAP(CCaptureDlg) S[T8T|_  
 ON_WM_SYSCOMMAND() Q dp)cT  
 ON_WM_PAINT() B~du-Z22IZ  
 ON_WM_QUERYDRAGICON() %!L9)(}"  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) M:6"H%h,W  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) I0 RvnMw  
 ON_BN_CLICKED(ID_CHANGE, OnChange) KK%M~Y+tU'  
//}}AFX_MSG_MAP TBrPf-Xr  
END_MESSAGE_MAP() Fr$5RAyg  
2wgg7[tGi  
BOOL CCaptureDlg::OnInitDialog() V#}kwON  
{ 6Kb1~jY  
 CDialog::OnInitDialog(); jb;hcraR  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); r(2uu  
 ASSERT(IDM_ABOUTBOX < 0xF000); y#$CMf -q^  
 CMenu* pSysMenu = GetSystemMenu(FALSE); e NafpK  
 if (pSysMenu != NULL) $D UZ!zaH!  
 { 4YX3+oS  
  CString strAboutMenu; 7`hP?a=  
  strAboutMenu.LoadString(IDS_ABOUTBOX); &(mR> mT  
  if (!strAboutMenu.IsEmpty()) -FCe:iY! A  
  { \_6/vZ%-B  
   pSysMenu->AppendMenu(MF_SEPARATOR); -7(@1@1  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); I,'k>@w{s  
  } Q?/o%`N  
 } <1COZ)   
 SetIcon(m_hIcon, TRUE); // Set big icon 9RI-Lq`  
 SetIcon(m_hIcon, FALSE); // Set small icon m<g~H4  
 m_Key.SetCurSel(0); {$Gd2g O  
 RegisterHotkey(); I15{)o(8$  
 CMenu* pMenu=GetSystemMenu(FALSE); c\V7i#u[d;  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); )@'}\_a3[]  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); C=4Qlt[`  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); P}G+4Sk  
 return TRUE; // return TRUE unless you set the focus to a control D{~fDRR  
} U!Z,xx[]  
A$xF$l  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) iRi-cQVy  
{ %-e 82J1  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~**.|%Kc  
 { AjgF6[B  
  CAboutDlg dlgAbout; [=^3n#WW  
  dlgAbout.DoModal(); aCLqk'  
 } mju>>\9  
 else LRMx<X8  
 { :TC@tM~Oy  
  CDialog::OnSysCommand(nID, lParam); D+7Rz_=  
 } q=qcm`ce  
} Mzw X>3x  
U2~kJ  
void CCaptureDlg::OnPaint() ?#YE`]  
{ CoAv Sw  
 if (IsIconic()) Km6YP!i  
 { -{vKus  
  CPaintDC dc(this); // device context for painting *~j@*{u  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); td3D=Y  
  // Center icon in client rectangle M>8A\;"  
  int cxIcon = GetSystemMetrics(SM_CXICON); 6;qy#\}2  
  int cyIcon = GetSystemMetrics(SM_CYICON); r s?R:+  
  CRect rect; Ktm4 A O  
  GetClientRect(&rect); 0|\$Vp  
  int x = (rect.Width() - cxIcon + 1) / 2; Uwx E<=z  
  int y = (rect.Height() - cyIcon + 1) / 2; Y0K[Sm>  
  // Draw the icon 1,!(0 5H  
  dc.DrawIcon(x, y, m_hIcon); W#C*5@8  
 }  XJ5 .  
 else  A4<Uu~  
 { 4^OY C  
  CDialog::OnPaint(); %lGfAYEM=  
 } p >t#@Eu|  
} =-lb)Z"d  
u21EP[[,  
HCURSOR CCaptureDlg::OnQueryDragIcon() P0PWJ^+,+  
{ f/Bp.YwL  
 return (HCURSOR) m_hIcon; t=O8f5Pf{  
} KC#q@InK  
8rS:5:Hi  
void CCaptureDlg::OnCancel() a1y-3 z  
{ } c }_<#I  
 if(bTray) w+E,INd i  
  DeleteIcon(); pKrN:ExB"\  
  CDialog::OnCancel(); 58J}{Req  
} zb<6 Ov  
q,eVjtF  
void CCaptureDlg::OnAbout() BV upDGh3  
{ t9:0TBt-[  
 CAboutDlg dlg; .oUTqki  
 dlg.DoModal(); J 9iy  
} qXe8Kto  
tX %5BTv  
void CCaptureDlg::OnBrowse() >!1.  
{ Jrpx}2'9:a  
 CString str; 25[I=ZdS  
 BROWSEINFO bi; MsGM5(r:b  
 char name[MAX_PATH]; C"T;Qp~B  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ,.1Psz^U  
 bi.hwndOwner=GetSafeHwnd(); Y@ksQ_u  
 bi.pszDisplayName=name; w{@o^rs  
 bi.lpszTitle="Select folder"; .KUv( -  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; l +OFw)8od  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); f-n1I^|  
 if(idl==NULL) * 8_wYYH  
  return; t*T2Z-!P  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); V<uR>TD(  
 str.ReleaseBuffer(); z]?N+NHOA  
 m_Path=str; l6 H|PR{  
 if(str.GetAt(str.GetLength()-1)!='\\') \(Y\|zC'0$  
  m_Path+="\\"; {I#]@,  
 UpdateData(FALSE); mFaZio0GK  
} D(RTVef  
^y1j.M@q  
void CCaptureDlg::SaveBmp() (/j/>9iro  
{ O7<]U_"I  
 CDC dc; .1Al<OLL  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); [t@Mn  
 CBitmap bm; wlk4*4dKn  
 int Width=GetSystemMetrics(SM_CXSCREEN); L(-b@Joh  
 int Height=GetSystemMetrics(SM_CYSCREEN); _JE"{ ;  
 bm.CreateCompatibleBitmap(&dc,Width,Height); b@f$nS B  
 CDC tdc; '*w00  
 tdc.CreateCompatibleDC(&dc); k$J zH$  
 CBitmap*pOld=tdc.SelectObject(&bm); [knN:{ l  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); dCk3;XU  
 tdc.SelectObject(pOld); n}G|/v<  
 BITMAP btm; FZ,#0ZYJGP  
 bm.GetBitmap(&btm); 8UyMVY  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ?!cvf{a  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 9Ujo/3,Ak  
 BITMAPINFOHEADER bih; [8,yF D_U  
 bih.biBitCount=btm.bmBitsPixel; ^ ALly2  
 bih.biClrImportant=0; 8'nVwb8I  
 bih.biClrUsed=0; giIWGa.a+  
 bih.biCompression=0; ]d0tE?9  
 bih.biHeight=btm.bmHeight; Sf7\;^  
 bih.biPlanes=1; *b/` Ya4  
 bih.biSize=sizeof(BITMAPINFOHEADER); E5xzy/ZQ  
 bih.biSizeImage=size; 1Z~)RJ<D  
 bih.biWidth=btm.bmWidth; ~r`9+b[9{  
 bih.biXPelsPerMeter=0; _5# y06Q  
 bih.biYPelsPerMeter=0; <_tT<5'[$u  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); &c:Ad% z  
 static int filecount=0; sy"^?th}b  
 CString name; u\{ g(li-I  
 name.Format("pict%04d.bmp",filecount++); =L:4i\4  
 name=m_Path+name; 2h1C9n%j9  
 BITMAPFILEHEADER bfh; aV?@s4  
 bfh.bfReserved1=bfh.bfReserved2=0; +hT:2TXn  
 bfh.bfType=((WORD)('M'<< 8)|'B'); )oPLl|=h  
 bfh.bfSize=54+size; ruzspS  
 bfh.bfOffBits=54; 3? 7\ T#=  
 CFile bf; L=8<B=QT$  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ U`d5vEhT  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 27"%"P.1  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); "C SC  
  bf.WriteHuge(lpData,size); B$!)YD;  
  bf.Close(); V'T ,4  
  nCount++; O 8u j`G 9  
 } -}=%/|\FG  
 GlobalFreePtr(lpData); ,:H\E|XeBw  
 if(nCount==1) FUOI3  
  m_Number.Format("%d picture captured.",nCount); b6F4>@gjg  
 else ^1aAjYFn  
  m_Number.Format("%d pictures captured.",nCount); ReI/]#Us  
  UpdateData(FALSE); Hp|_6hO 2  
} r1L ViK  
fhp<oe>D  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) qI<mjB{3`  
{ #=f?0UTA  
 if(pMsg -> message == WM_KEYDOWN) >wBJy4:  
 { rIh l.5Y  
  if(pMsg -> wParam == VK_ESCAPE) i2(1ki/|O  
   return TRUE; s,n0jix@  
  if(pMsg -> wParam == VK_RETURN) ^!z [t\$  
   return TRUE; <$~mE9a6  
 } #Av.iAs  
 return CDialog::PreTranslateMessage(pMsg); ;@Z#b8aM}  
} (B_\TdQ  
"xHgqgFyO  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) OJ zs Q  
{ >U*T0FL7  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?1$fJ3  
  SaveBmp(); $UCAhG$  
  return FALSE; \lC   
} d'$T4yA  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Z->p1xkX  
 CMenu pop; okv1K  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); C{DvD'^  
 CMenu*pMenu=pop.GetSubMenu(0); Dzs[GAQ]  
 pMenu->SetDefaultItem(ID_EXITICON); YY!6/5*/]  
 CPoint pt; <-S%kA8  
 GetCursorPos(&pt); a@*S+3  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 4^Q :  
 if(id==ID_EXITICON)  {=QiZWu  
  DeleteIcon(); qt 2d\f  
 else if(id==ID_EXIT) S.q].a  
  OnCancel(); ct,l^|0Hu8  
 return FALSE; WjwLM2<nK7  
} ;Uu(zhbj  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); meks RcF  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) mPP`xL?T  
 AddIcon(); p>;_e(  
 return res; `zXO_@C  
} '07P&g-  
1u(.T0j7f  
void CCaptureDlg::AddIcon() a5!Fv54  
{ $3uKw!z  
 NOTIFYICONDATA data; MFm"G  
 data.cbSize=sizeof(NOTIFYICONDATA); +d!v}aJ  
 CString tip; %\r!7@Q  
 tip.LoadString(IDS_ICONTIP); .h5[Q/*h  
 data.hIcon=GetIcon(0); .]7Qu;L  
 data.hWnd=GetSafeHwnd(); H0SQ"?  
 strcpy(data.szTip,tip); ?Cg>h  
 data.uCallbackMessage=IDM_SHELL; pL%r,Y_^\x  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; {=-\|(Bx  
 data.uID=98; uDSxTz{  
 Shell_NotifyIcon(NIM_ADD,&data); wqW 0v\  
 ShowWindow(SW_HIDE); *b}lF4O?  
 bTray=TRUE; L^4-5`gj  
}  n>`as  
/'DsB%7g  
void CCaptureDlg::DeleteIcon() YH_7=0EJ  
{ ['*8IWg  
 NOTIFYICONDATA data; w{90`  
 data.cbSize=sizeof(NOTIFYICONDATA); nn9wdt@.]  
 data.hWnd=GetSafeHwnd(); 6 ]pX>Xho  
 data.uID=98; T%n2$  
 Shell_NotifyIcon(NIM_DELETE,&data); 0}xFD6{X  
 ShowWindow(SW_SHOW); |7pR)KH3  
 SetForegroundWindow(); \Z/)Y;|mi0  
 ShowWindow(SW_SHOWNORMAL); *"r~-&IL  
 bTray=FALSE; o9S+6@  
} Kmv+1T0,  
9Xo[(h)5d  
void CCaptureDlg::OnChange() zC:wNz@zK  
{ ^e>Wo7r  
 RegisterHotkey(); 4bEf  
} Z)xaJGbw  
fH ?ha  
BOOL CCaptureDlg::RegisterHotkey() n?urE-_  
{ -"[<ek  
 UpdateData(); A4?+T+#d  
 UCHAR mask=0; lP!;3iJ B  
 UCHAR key=0; !\;FNu8_.  
 if(m_bControl) <P;}unq.kw  
  mask|=4; (nab  
 if(m_bAlt) -TOIc%  
  mask|=2; [kgdv6E  
 if(m_bShift) (%:>T Q(  
  mask|=1; JHJ~X v  
  key=Key_Table[m_Key.GetCurSel()]; Q\,o :ZU_  
 if(bRegistered){ TbF4/T1b  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); |xvy')(b  
  bRegistered=FALSE; 0% #<c p  
 } <ExZ:ip  
 cMask=mask; tpTAeQ*:d  
 cKey=key; I]y.8~xs  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 3 Lsj}p  
 return bRegistered; 1#4PG'H  
} cl*PFQp9j  
@M8|(N%  
  四、小结 2JS`Wqy  
Z0>DNmH*  
  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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