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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: $}*bZ~  
  ROv(O;.Ty  
  一、实现方法 1%R8q=_  
X/8CvY#n  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: Bj-80d,  
_$oN"pj  
#pragma data_seg("shareddata") l4:5(1  
HHOOK hHook =NULL; //钩子句柄 {4%B^+}T  
UINT nHookCount =0; //挂接的程序数目 VXM5 B  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 )rqb<O  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 tE~OWjL  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 9MI~yIt`L  
static int KeyCount =0; 4=T.rVS[  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 g<@P_^vo  
#pragma data_seg() ^5:xSQ@:  
[lmghI!  
  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。 WlJ $p$I`  
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  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: 5Q9nJC{'NN  
#2XX[d%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR _~=qByD   
cKey,UCHAR cMask) .o._`"V  
{ h !yu. v  
 BOOL bAdded=FALSE; 6w )mo)<X  
 for(int index=0;index<MAX_KEY;index++){ D #`o  
  if(hCallWnd[index]==0){ Exy|^Dr0  
   hCallWnd[index]=hWnd; 8`0/?MZ)   
   HotKey[index]=cKey; rQuozbBb  
   HotKeyMask[index]=cMask; a___SYl 'K  
   bAdded=TRUE; \fk%^1XY  
   KeyCount++; ;AjY-w  
   break; Q|gRBu  
  } O>h,u[0  
 } tz).]E D  
 return bAdded; O@Ro_sPG(  
} W$I^Ej}>$  
//删除热键 s"7$SxMT  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "$lE~d">  
{ s5 P~feg  
 BOOL bRemoved=FALSE; \$iU#Z  
 for(int index=0;index<MAX_KEY;index++){ _~{Nco7T  
  if(hCallWnd[index]==hWnd){ !ULU#2'1  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ .w.jT"uD!  
    hCallWnd[index]=NULL; 6ojEEM  
    HotKey[index]=0; YM:;mX5B  
    HotKeyMask[index]=0; '1jG?D  
    bRemoved=TRUE; x$6` k  
    KeyCount--; U)PNY  
    break; G>>`j2:y  
   } +i@r-OL   
  } 2$fFl,v!z  
 } P_[A  
 return bRemoved; 4dB6cg  
} {#Lj,o  
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+p:?blG  
  DLL中的钩子函数如下: (D?%(f  
#TXN\YNP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) BeNH"Y:E  
{ 1&Fty'p  
 BOOL bProcessed=FALSE; 4GiHp7Y&A  
 if(HC_ACTION==nCode) w6PKr^  
 { J#```cB  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 |9 Gng`)  
   switch(wParam) z)Yk&;XC  
   {  w`N|e0G@  
    case VK_MENU: wa #$9p~Q  
     MaskBits&=~ALTBIT; "M GX(SQ  
     break; L,m'/}$  
    case VK_CONTROL: 4)cQU.(*k  
     MaskBits&=~CTRLBIT; J0 [^hH  
     break; A<1:vV  
    case VK_SHIFT: 8Moe8X#3  
     MaskBits&=~SHIFTBIT; :Z}d#Rbl  
     break; :75$e%'A  
    default: //judge the key and send message )*b dG'}  
     break; /uh?F  
   } ="k9 y  
   for(int index=0;index<MAX_KEY;index++){ ,t2yw  
    if(hCallWnd[index]==NULL) <~%e{F:[#  
     continue; SRUg2)d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4;rt|X77  
    { (P+TOu-y\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); {.D^2mj |  
     bProcessed=TRUE; q{fgsc8v\  
    } 3?R56$-+  
   } gB&8TE~Y  
  } ^ B>BA  
  else if((lParam&0xc000ffff)==1){ //有键按下 ]uikE2nn  
   switch(wParam) r I-A)b4  
   { D?)^{)49  
    case VK_MENU: i;CVgdQ8  
     MaskBits|=ALTBIT; y1oQ4|KSI  
     break; L.E6~Rv  
    case VK_CONTROL: y7x&/2  
     MaskBits|=CTRLBIT; BA5b;+o-  
     break; 8zOoVO  
    case VK_SHIFT: $jc&Tk#  
     MaskBits|=SHIFTBIT; cE|Z=}4I7  
     break; $ykujyngS4  
    default: //judge the key and send message >dr34=(  
     break; + YjK#  
   } hxXl0egI  
   for(int index=0;index<MAX_KEY;index++){ ytWTJ>L  
    if(hCallWnd[index]==NULL) M6j!_0j  
     continue; S4salpz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'l&),]|$)  
    { &e-MOM2&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #Yqj27&  
     bProcessed=TRUE; <r8sZrY  
    } kn^? .^dVX  
   } hB !>*AsG  
  } l2&s4ERqSm  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 VJ8 " Q  
   for(int index=0;index<MAX_KEY;index++){ ]1^F  
    if(hCallWnd[index]==NULL) "1-gMob  
     continue; (]Pr[xB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ++m^z` D  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); lCX*Q{s22  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 )zKZ<;#y  
   } 4P>4d +  
  } Dh4 EP/=z  
 } 'X$J+s}6&  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 68!W~%?pR  
} &4dh$w]q  
'Avp16zg  
  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: qubyZ8hx  
S5,y!K]C~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); < s>y{ e  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); cl'#nLPz;  
k;fy8  
  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: ~+HZQv3Y  
R9!GDKts%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ; xz}]@]Ar  
{ O1 KT  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Z ZMz0^V  
 { I?z*.yA*  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 GY3g`M   
  SaveBmp(); ZQVr]/W^r  
  return FALSE; )J"*[[e  
 } >$g+Gx\v4  
 …… //其它处理及默认处理 |)4aIa  
} TA~FP#.  
.*x |TPv{  
vhEXtjL  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 d4r@Gx%BE  
nXg:lCI-uu  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 @ uF$m/g  
x+%(z8wD  
  二、编程步骤 m j!P ]  
W pdn^=dhL  
  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"; \nKpJ9!  
m,qMRcDF  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; `yvH0B -  
x,+2k6Wn!  
  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; )M: pg%  
1c2zFBl.&  
  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; SXJ]()L?[v  
_P:}]5-|  
  5、 添加代码,编译运行程序。 .O1Kwu  
9[9 ZI1*s  
三、程序代码 M In6p  
U7(t >/  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL mT3'kUZ}]  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) VOa7qnh4:[  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ #K4lnC2qz  
#if _MSC_VER > 1000 (9A`[TRwi  
#pragma once jW!x!8=  
#endif // _MSC_VER > 1000 < 9 vS  
#ifndef __AFXWIN_H__ u~-,kF@  
#error include 'stdafx.h' before including this file for PCH c[6=&  
#endif 50?5xSEM0_  
#include "resource.h" // main symbols Pi!3wy  
class CHookApp : public CWinApp $Rd]e C  
{ zg[.Pws:E  
 public: XSv)=]{  
  CHookApp(); jW< aAd  
  // Overrides ?!{nNJ  
  // ClassWizard generated virtual function overrides w%NT 0J  
  //{{AFX_VIRTUAL(CHookApp) Ia'm9Z*  
 public: 8euh]+  
  virtual BOOL InitInstance(); O\5q_>]  
  virtual int ExitInstance(); _ l$1@  
  //}}AFX_VIRTUAL WNa#X]*E)  
  //{{AFX_MSG(CHookApp) Fb^Ae6/i  
  // NOTE - the ClassWizard will add and remove member functions here. 4Up3x+bg  
  // DO NOT EDIT what you see in these blocks of generated code ! Aq5@k\[  
  //}}AFX_MSG jWX^h^n7K  
  DECLARE_MESSAGE_MAP() :8CYTEc  
}; D$vP&7pOr4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); \U\k$ (  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7Gs0DwV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); V1 :aR3*!  
BOOL InitHotkey(); 1f/8XxTB  
BOOL UnInit(); W4ygJL7 6  
#endif b~L8m4L  
ss4<s 5:y  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. jwW6m@+  
#include "stdafx.h" L>PPAI  
#include "hook.h" %(v<aEQtt  
#include <windowsx.h> M,WC+")Z=  
#ifdef _DEBUG {-'S#04  
#define new DEBUG_NEW re%MT@L#  
#undef THIS_FILE 4or8fG  
static char THIS_FILE[] = __FILE__; .%3qzOrN  
#endif OZc.Rtgc  
#define MAX_KEY 100 [h=[@jiB  
#define CTRLBIT 0x04 $mF(6<w  
#define ALTBIT 0x02 F# a)"$j;  
#define SHIFTBIT 0x01 E~| XY9U36  
#pragma data_seg("shareddata") ,iYKtS3  
HHOOK hHook =NULL; ;A3aUN;"I  
UINT nHookCount =0; BGSqfr1F  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 5"cYZvGkJ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT B;6N.X(K  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey @?gN &Z)I  
static int KeyCount =0; {R{Io|   
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ;=ci7IT'  
#pragma data_seg() *]uj0@S  
HINSTANCE hins; OQC.p,SO  
void VerifyWindow(); y~jYGN  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Z9+xB"q2  
//{{AFX_MSG_MAP(CHookApp) h=`1sfz  
// NOTE - the ClassWizard will add and remove mapping macros here. UZ qQ|3  
// DO NOT EDIT what you see in these blocks of generated code! 6lKM5,Oa  
//}}AFX_MSG_MAP M,f|.p{,Y  
END_MESSAGE_MAP() OM4q/!)A]  
HXg4 T  
CHookApp::CHookApp() Z"u|-RoBV  
{ @m99xF\e  
 // TODO: add construction code here, 1r-#QuV#  
 // Place all significant initialization in InitInstance #]_S)_Z-  
} p#T^o]+  
"v9i;Ba>+  
CHookApp theApp; Z?o?"|o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Ac@ zTK6>  
{ ~l@-gAyw  
 BOOL bProcessed=FALSE;  @U;U0  
 if(HC_ACTION==nCode) ~?x `f +  
 { U(t_uc5q  
  if((lParam&0xc0000000)==0xc0000000){// Key up iI.d8}A  
   switch(wParam) ^1 P@BRh  
   { Jc74A=sT  
    case VK_MENU: U if61)+!i  
     MaskBits&=~ALTBIT; 61}hB>TT:  
     break; (wtw1E5X  
    case VK_CONTROL: ^9zFAY.|  
     MaskBits&=~CTRLBIT; z/IZ ;K_e  
     break; "VfV;)]|w  
    case VK_SHIFT: mEM/}]2  
     MaskBits&=~SHIFTBIT; J BN_Upat  
     break; oD=6D9c?  
    default: //judge the key and send message ncy?w e  
     break; aRh1Q=^@(4  
   } C*f3PB=H_  
   for(int index=0;index<MAX_KEY;index++){ .!&S{;Vv?W  
    if(hCallWnd[index]==NULL) F~Z~OqCS  
     continue; +#/`4EnI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) IUJRP  
    { fsxZQ=-PW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); bR*/d-v^  
     bProcessed=TRUE; jRv j:H9  
    } g^qbd$}  
   } ~_YU%y  
  } 5Tt%<#4  
  else if((lParam&0xc000ffff)==1){ //Key down o3oAk10  
   switch(wParam) '/@] V  
   { t;~H6  
    case VK_MENU: E{-W#}#  
     MaskBits|=ALTBIT; fcC?1M[BP~  
     break; >[U.P)7;  
    case VK_CONTROL: *k7vm%#ns  
     MaskBits|=CTRLBIT; ;J)8#|  
     break; 7rdPA9  
    case VK_SHIFT: pJK}9p=4`  
     MaskBits|=SHIFTBIT; |4XR [eX  
     break; /h!Y/\kI  
    default: //judge the key and send message W,[b:[~v  
     break; B9-Nb 4  
   } )^ky @V  
   for(int index=0;index<MAX_KEY;index++) \>>^eZ  
   { _#nP->0)  
    if(hCallWnd[index]==NULL) ezOZHY>|#  
     continue; w?+v+k\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 96&Y  
    { i7m=V T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); R4R SXV  
     bProcessed=TRUE; \40d?N#D  
    } M]Y72K^  
   } 6}RRrYL7I  
  } %ys-y?r  
  if(!bProcessed){ pNHO;N[&  
   for(int index=0;index<MAX_KEY;index++){ >^  E  
    if(hCallWnd[index]==NULL) :cmQ w  
     continue; ``:AF:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Ofyz,% |Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %Ny`d49&  
   } #xopJaY  
  } l5m5H,`  
 } MZ8jL,a^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); S4jt*]w5b  
} .kGlUb?^Q  
8-wW?YTG  
BOOL InitHotkey() Px>Gc:!>  
{ nn"Wn2ciS  
 if(hHook!=NULL){ 6#JdQ[IP6  
  nHookCount++; ,a$ ?KX  
  return TRUE; kUdl2["MZ  
 } A!K/92[#@  
 else iuX82z`  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); CulU?-[i  
  if(hHook!=NULL) \rw/d5.  
   nHookCount++; iE|qU_2Y  
  return (hHook!=NULL); S!<1C Fh  
} =.]>,N`C  
BOOL UnInit() b$24${*'  
{ sp0j2<$a  
 if(nHookCount>1){ CFW\  
  nHookCount--; }Ot I8;>  
  return TRUE; G$5N8k[2  
 } fCMH<}w  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .=VtMi$n  
 if(unhooked==TRUE){ fDn|o"  
  nHookCount=0; Ua@rp3fr  
  hHook=NULL; o@o6<OP^  
 } zKi5e+\  
 return unhooked; DiB~Ovh|  
} pLFJ"3IJB  
6T}bD[h4?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "rjqDpH  
{ %r<c>sFJN  
 BOOL bAdded=FALSE; [Z5Lgg&  
 for(int index=0;index<MAX_KEY;index++){ hm%'k~  
  if(hCallWnd[index]==0){ 2>.2H  
   hCallWnd[index]=hWnd; OZF^w[ `w  
   HotKey[index]=cKey; zs@#.OEH  
   HotKeyMask[index]=cMask; 9q2 >_Mv  
   bAdded=TRUE; UH<nc;.B  
   KeyCount++; Q}J'S5%  
   break; %0PdN@I  
  } CWVCYm@!kz  
 } JeR8Mb  
 return bAdded; r|XNS>V ,$  
} <bwsK,C  
? [?{X~uq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yn0OPjH  
{ ZD9UE3-  
 BOOL bRemoved=FALSE; ~h~K"GbC?  
 for(int index=0;index<MAX_KEY;index++){ Fr}e-a  
  if(hCallWnd[index]==hWnd){ H?M#7K~[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ AQ!FJ(X(  
    hCallWnd[index]=NULL; 'oZ/fUl|7  
    HotKey[index]=0; ({ 7tp!@  
    HotKeyMask[index]=0; DRo@gYDn  
    bRemoved=TRUE; y&0&K 4aa  
    KeyCount--; uA?_\z?  
    break; #rZk&q  
   } Tr1#=&N0  
  } yqF$J"=|  
 } nb:J"  
 return bRemoved; Ul?Ha{ W  
} A2o ;YyF  
JM#jg-z,~  
void VerifyWindow() d9XX^nY.  
{ sW~Z?PFP  
 for(int i=0;i<MAX_KEY;i++){ `eIX*R   
  if(hCallWnd!=NULL){ :\@WY  
   if(!IsWindow(hCallWnd)){ f:k3j}&  
    hCallWnd=NULL; w#Y<~W&  
    HotKey=0; )$/Gh&1G  
    HotKeyMask=0; 2kTLj2 @o,  
    KeyCount--; AW8"@  
   } P!C!E/Jf5  
  } ny5 = =C{9  
 } |H.(?!nTb  
} q|,I\H5}  
rO% |PRP  
BOOL CHookApp::InitInstance() %C= {\]-2~  
{ wSp1ChS k  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); "`DCXn#mB  
 hins=AfxGetInstanceHandle(); krTH<- P  
 InitHotkey(); bA-=au?o5  
 return CWinApp::InitInstance(); '#SacJ\L7  
} Q{Gi**<  
#,O<E@E  
int CHookApp::ExitInstance() R1z\b~@"  
{ l1~>{:mq  
 VerifyWindow(); 4WnB{9 i`I  
 UnInit(); YF=@nR$_~j  
 return CWinApp::ExitInstance(); k/vE|  
} Q)}sX6TB  
W'\{8&:!  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file "v-\nAu  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) p+ymt P F  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ OHzI!,2]  
#if _MSC_VER > 1000 S]Gw}d]4  
#pragma once cO2 .gQo'  
#endif // _MSC_VER > 1000 ]Au78Yom  
f/ 9]o  
class CCaptureDlg : public CDialog &oevgG  
{ 8jxgSB",  
 // Construction dOq*W<%  
 public: w \pD'1e  
  BOOL bTray; QQKvy0?1  
  BOOL bRegistered; Cw]Q)rX{  
  BOOL RegisterHotkey(); :N#gNtC)b  
  UCHAR cKey; ;JpU4W2/  
  UCHAR cMask; wobTT1!|  
  void DeleteIcon(); 9rX[z :  
  void AddIcon(); z3b8  
  UINT nCount; }io9Hk>|  
  void SaveBmp(); "4LYqDe  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor __""!Yz  
  // Dialog Data 4J2NIFZ  
  //{{AFX_DATA(CCaptureDlg) XpWqL9s_E  
  enum { IDD = IDD_CAPTURE_DIALOG }; {4&G\2<^^  
  CComboBox m_Key; @B$ Y`eK\  
  BOOL m_bControl; $=n|MbFl  
  BOOL m_bAlt; /Cr0jWu _  
  BOOL m_bShift; j_SRCm~:  
  CString m_Path; h2+vl@X  
  CString m_Number; q>w@W:tZ  
  //}}AFX_DATA #rzq9}9tB  
  // ClassWizard generated virtual function overrides wH[@#UP3l  
  //{{AFX_VIRTUAL(CCaptureDlg) v\:>} <gc  
 public: >Vc_.dR)E  
  virtual BOOL PreTranslateMessage(MSG* pMsg); :L`  
 protected: KYVB=14  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support DY?`Y%"  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ]j0v.[SX  
  //}}AFX_VIRTUAL I ms?^`N  
  // Implementation ghJ81  
 protected: 8QDRlF:;<  
  HICON m_hIcon; ~=P&wBnJ  
  // Generated message map functions j& f-yc'i-  
  //{{AFX_MSG(CCaptureDlg)  m2%uGqz  
  virtual BOOL OnInitDialog(); N(Us9  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 5xP\6Nx6&5  
  afx_msg void OnPaint(); *G$tfb(  
  afx_msg HCURSOR OnQueryDragIcon(); d c_^   
  virtual void OnCancel(); M cE$=Vv  
  afx_msg void OnAbout(); wFpt#_fS  
  afx_msg void OnBrowse(); c+#GX)zh\G  
  afx_msg void OnChange(); Z=DAA+T`  
 //}}AFX_MSG L #p-AK  
 DECLARE_MESSAGE_MAP() c]F$$BT  
}; r ,|T@|{  
#endif oddS~lW  
ofl3G {u  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file {hK$6bD3^  
#include "stdafx.h" :*#AJV)  
#include "Capture.h" pox\Gu~.0  
#include "CaptureDlg.h" .Xh^L  
#include <windowsx.h> "$PbpY  
#pragma comment(lib,"hook.lib") mgX0@#wFn  
#ifdef _DEBUG /<s'@!W  
#define new DEBUG_NEW ROr$ Sz  
#undef THIS_FILE uXW<8( %W  
static char THIS_FILE[] = __FILE__; w``t"v4  
#endif yInW?3  
#define IDM_SHELL WM_USER+1 BqK|4-Pf  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); k}l5v)m  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); e{.2*>pH  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; S1wt>}w0$  
class CAboutDlg : public CDialog Nqp%Z7G  
{ :x]gTZ?  
 public: +bI&0`  
  CAboutDlg(); ;%odN d  
  // Dialog Data 3zY"9KUN  
  //{{AFX_DATA(CAboutDlg) pq+Gsu1^  
  enum { IDD = IDD_ABOUTBOX }; md_aD  
  //}}AFX_DATA VR2BdfKU,  
  // ClassWizard generated virtual function overrides i 4lR$]@  
  //{{AFX_VIRTUAL(CAboutDlg) WZdA<<,:o  
 protected: 8(q4D K\5u  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support z m\=4^X  
  //}}AFX_VIRTUAL w<&Nn`V  
  // Implementation ]K?z|&N|HK  
 protected: SQWwxFJ  
  //{{AFX_MSG(CAboutDlg) EU TTeFp  
  //}}AFX_MSG beEdH>  
  DECLARE_MESSAGE_MAP() k uU,7 <o  
}; ,d<wEB?\`  
/!oi`8D  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ~UB@IV6O  
{ Sm;&2"  
 //{{AFX_DATA_INIT(CAboutDlg) 0FsGqFt  
 //}}AFX_DATA_INIT AF ZHS\  
} IfeG"ua|  
 .VuZ=  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) (A\qZtnyl  
{ ]IXKoJUf  
 CDialog::DoDataExchange(pDX); C0z E<fl  
 //{{AFX_DATA_MAP(CAboutDlg) 1C^6'9o  
 //}}AFX_DATA_MAP 'CjcOI s  
} ='T<jV`evu  
bw9a@X  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ;$&&tEh)  
 //{{AFX_MSG_MAP(CAboutDlg) ik_Ll|  
 // No message handlers 724E(?>J  
 //}}AFX_MSG_MAP }E[S%W[  
END_MESSAGE_MAP() a"EP`  
=B4mi.;@i  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Xl;u  
: CDialog(CCaptureDlg::IDD, pParent) $T tCVR  
{ N-]h+Cnyu  
 //{{AFX_DATA_INIT(CCaptureDlg) x&+/da-E/5  
  m_bControl = FALSE; X8<<;?L  
  m_bAlt = FALSE; nORm7sa9  
  m_bShift = FALSE; XB UO  
  m_Path = _T("c:\\"); M/:kh,3  
  m_Number = _T("0 picture captured."); fBS;~;l  
  nCount=0; E@hvO%  
  bRegistered=FALSE; <w+K$WE {  
  bTray=FALSE; HGs.v}@&  
 //}}AFX_DATA_INIT v0jRoE#  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 4&!`Yi_1L  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); }I}RqD:`  
} x,@cU}D  
Jj*XnL*  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ,;y 5Mu8  
{ <`9Q{~*=t  
 CDialog::DoDataExchange(pDX); )i0\U  
 //{{AFX_DATA_MAP(CCaptureDlg) Ra&HzK?  
  DDX_Control(pDX, IDC_KEY, m_Key); `n Y!nh6!  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); |0ACapp!  
  DDX_Check(pDX, IDC_ALT, m_bAlt); c>:}~.~T  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 1,T8@8#  
  DDX_Text(pDX, IDC_PATH, m_Path); Eh#W*Bg  
  DDX_Text(pDX, IDC_NUMBER, m_Number); M['8zN  
 //}}AFX_DATA_MAP `]#DdJ_|  
} Dh BUMDoB  
.8uJ%'$)  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) qS*qHT(u19  
//{{AFX_MSG_MAP(CCaptureDlg) 9(QY~F  
 ON_WM_SYSCOMMAND() W=&\d`><k  
 ON_WM_PAINT() HtgVD~[]  
 ON_WM_QUERYDRAGICON() 8TD:~ee  
 ON_BN_CLICKED(ID_ABOUT, OnAbout)  ;iy]mPd  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) `8\ _ ]w0  
 ON_BN_CLICKED(ID_CHANGE, OnChange) /P<RYA~  
//}}AFX_MSG_MAP %L=ro qz  
END_MESSAGE_MAP() D\ HmY_  
BR8z%R  
BOOL CCaptureDlg::OnInitDialog() *$Aneq0f  
{ K!7o#"GM  
 CDialog::OnInitDialog(); ':R)i.TS  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); iSUn}%YFz!  
 ASSERT(IDM_ABOUTBOX < 0xF000); /PE3>"|wE  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .wtb7U;7  
 if (pSysMenu != NULL) #yFDC@gH1  
 { i d\0yRBt  
  CString strAboutMenu; 5O#CdN-S  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 2.p7fu  
  if (!strAboutMenu.IsEmpty()) *JZU 0Xb  
  { 1>c`c]s3  
   pSysMenu->AppendMenu(MF_SEPARATOR); }at8b ^  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); LUna stA^  
  } Vx;f/CH3!  
 } Bbz#$M!:  
 SetIcon(m_hIcon, TRUE); // Set big icon U O YM   
 SetIcon(m_hIcon, FALSE); // Set small icon 1RY}mq  
 m_Key.SetCurSel(0); _FeLSk.  
 RegisterHotkey();  4>uz'j<  
 CMenu* pMenu=GetSystemMenu(FALSE); wz+  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); R{NmWj['Mg  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 'C]zB'H=  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _&D I_'5q+  
 return TRUE; // return TRUE unless you set the focus to a control ^SpD)O{  
} <8|vj 2d2  
br .jj  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) { .B^  
{ bqJL@!T  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) y-cRqIM  
 { ^DS9D:oE  
  CAboutDlg dlgAbout; h$)!eSu  
  dlgAbout.DoModal(); 6k%N\!_TUW  
 } F[ N{7C3  
 else W @Y$!V<  
 { \S[:  
  CDialog::OnSysCommand(nID, lParam); , b ,`;I  
 } 1`Cr1pH  
} hzg&OW=:  
rV<yM$IA  
void CCaptureDlg::OnPaint() b7E= u0  
{ Bcg\p}  
 if (IsIconic()) '!]ry<  
 { oL1m<cQo9  
  CPaintDC dc(this); // device context for painting eh2w7 @7Q  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ,DqI> vx|  
  // Center icon in client rectangle n,hHh=.Fu  
  int cxIcon = GetSystemMetrics(SM_CXICON); H^_[nL  
  int cyIcon = GetSystemMetrics(SM_CYICON); ]sE~gro  
  CRect rect; (NyS2 `  
  GetClientRect(&rect); , ?WTX  
  int x = (rect.Width() - cxIcon + 1) / 2; 1@" eeR  
  int y = (rect.Height() - cyIcon + 1) / 2; J [J,  
  // Draw the icon w 6+X{  
  dc.DrawIcon(x, y, m_hIcon); \CM/KrCR  
 } Ytmt+9  
 else o/@.*Rj>Bg  
 { 'b]GcAL  
  CDialog::OnPaint(); dms R>Q  
 } ..UmbJJ.u  
} tu#VZAPW@  
),v[.9!}:  
HCURSOR CCaptureDlg::OnQueryDragIcon() +v2Fr}  
{ dy-m9fc6%  
 return (HCURSOR) m_hIcon; j#$ R.  
} vQ2kL`@  
q+.DZ @  
void CCaptureDlg::OnCancel() rY4{,4V  
{ &s->,-,  
 if(bTray) 2>l4$G 0  
  DeleteIcon(); dX-{75o5P  
  CDialog::OnCancel(); $`(}ygmP  
} " |[w.`  
F<Js"z+  
void CCaptureDlg::OnAbout() cW4:eh  
{ 0(VAmb%{  
 CAboutDlg dlg; ~Os"dAgZFY  
 dlg.DoModal(); xbnx*4o0  
} h-+9Bv]  
5"%r,GMU  
void CCaptureDlg::OnBrowse() I7ZY9W(S  
{ A6v02WG_1T  
 CString str; (zIP@ H  
 BROWSEINFO bi; {Lwgj7|~  
 char name[MAX_PATH]; vz #VW  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); `of 5h* k  
 bi.hwndOwner=GetSafeHwnd(); j2\bCGY  
 bi.pszDisplayName=name; AP' Uc A  
 bi.lpszTitle="Select folder"; v]& )+0  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 7dyGC:YuTL  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); -D?T0>  
 if(idl==NULL) xQ\/6|  
  return; {P"$;_Y"<  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); D+lzISp~e  
 str.ReleaseBuffer(); +ObP[F  
 m_Path=str; 7(rNJPrU~=  
 if(str.GetAt(str.GetLength()-1)!='\\') #n2'N^t  
  m_Path+="\\"; }J73{  
 UpdateData(FALSE); -'BC*fVr  
} 0ubT/  
6S)$wj*w  
void CCaptureDlg::SaveBmp() WF,<7mx=-  
{ c?A(C#~ z  
 CDC dc; <^snS,06  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); \W=~@k  
 CBitmap bm; ivYHq#b59  
 int Width=GetSystemMetrics(SM_CXSCREEN); w vBx]$SC  
 int Height=GetSystemMetrics(SM_CYSCREEN); CE]0OY  
 bm.CreateCompatibleBitmap(&dc,Width,Height); :akEl7/&  
 CDC tdc; 6Qne rd%Ec  
 tdc.CreateCompatibleDC(&dc); u&yAMWl  
 CBitmap*pOld=tdc.SelectObject(&bm); qgg/_H:;w  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); nd*9vxM  
 tdc.SelectObject(pOld); 23?\jw3w  
 BITMAP btm; Wjc1EW!2x  
 bm.GetBitmap(&btm); bRT1~)  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Cj"+` C)l  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); [[2Zcz:  
 BITMAPINFOHEADER bih; n[8ju,=  
 bih.biBitCount=btm.bmBitsPixel; smvIU0:K  
 bih.biClrImportant=0; Tj7OV}:  
 bih.biClrUsed=0; 64 9{\;*4  
 bih.biCompression=0; LsH&`G^<  
 bih.biHeight=btm.bmHeight; A:PQIcR;V  
 bih.biPlanes=1; @{ *z1{  
 bih.biSize=sizeof(BITMAPINFOHEADER); o7 ^t- L  
 bih.biSizeImage=size; "| cNY_$&s  
 bih.biWidth=btm.bmWidth; d 4w+5H" u  
 bih.biXPelsPerMeter=0; CB_ww=  
 bih.biYPelsPerMeter=0; ts%XjCN[  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 7s@%LS  
 static int filecount=0; WP[h@#7<  
 CString name; 4>eY/~odq]  
 name.Format("pict%04d.bmp",filecount++); !)gTS5Rh:  
 name=m_Path+name; B64L>7\>`  
 BITMAPFILEHEADER bfh; q}P< Ejq}  
 bfh.bfReserved1=bfh.bfReserved2=0; x>:~=#Vi  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Z^ynw8k"  
 bfh.bfSize=54+size; )d5H v2/0  
 bfh.bfOffBits=54; Lf0Y|^!S_u  
 CFile bf; Z BjyQ4h  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ hr3RC+ y  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Afa| 6zZ>  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); dz@L}b*  
  bf.WriteHuge(lpData,size); jo-jPYH T  
  bf.Close(); 0?OTa<c  
  nCount++; $I*ye+a*{q  
 } :cU6W2EV  
 GlobalFreePtr(lpData); I/4:SNha  
 if(nCount==1) "2} {lu  
  m_Number.Format("%d picture captured.",nCount); j#L"fW^GM  
 else s |B  
  m_Number.Format("%d pictures captured.",nCount); eGcc'LBr;  
  UpdateData(FALSE); DP{kin"4I  
} K8`Jl=}z%&  
[ u7p:?WDW  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !SRElb A;i  
{ )y>o;^5'  
 if(pMsg -> message == WM_KEYDOWN) xPMTmx?2  
 { =nPIGI72VO  
  if(pMsg -> wParam == VK_ESCAPE) Mh [TZfV  
   return TRUE; IIrh|>d_7  
  if(pMsg -> wParam == VK_RETURN) 4@ EY+p  
   return TRUE; eaLR-+vEB  
 } RhwqAok|lj  
 return CDialog::PreTranslateMessage(pMsg); U8TH}9Q  
} U9^o"vT  
z}?*1c  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |dNJx<-  
{ FvpaU\D  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ <ua`WRQr  
  SaveBmp(); @CGci lS=  
  return FALSE; dJyf.VJ  
} X*f#S:kiNU  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ C>l{_J)n  
 CMenu pop; 6&,n\EXF  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); me-Tv7WL  
 CMenu*pMenu=pop.GetSubMenu(0); 1^&qlnqH  
 pMenu->SetDefaultItem(ID_EXITICON); A"|y<  
 CPoint pt;  l Ozi|  
 GetCursorPos(&pt); Rdb[{Ruxb  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); @o4+MQFn  
 if(id==ID_EXITICON) n-ZOe]3  
  DeleteIcon(); bu[PQsT  
 else if(id==ID_EXIT) Pnf|9?~$H  
  OnCancel(); udw>{3>  
 return FALSE; : L}Fm2^  
} `|nCr  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); f3_-{<FZ  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) [I6(;lq2  
 AddIcon(); %C8p!)Hu  
 return res; BpL7s ej7  
} |#_IAN  
j}P xq  
void CCaptureDlg::AddIcon() )v\zaz  
{ M"XILNV-~  
 NOTIFYICONDATA data; poLzgd  
 data.cbSize=sizeof(NOTIFYICONDATA); 9Q\CJ9  
 CString tip; UqVcN$^b  
 tip.LoadString(IDS_ICONTIP); GM]" $  
 data.hIcon=GetIcon(0); %Xe#'qNq)  
 data.hWnd=GetSafeHwnd(); ^(}D  
 strcpy(data.szTip,tip); bcx,K b  
 data.uCallbackMessage=IDM_SHELL; :mP%qG9U  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; }~B@Z\`O  
 data.uID=98; h?t#ABsVK  
 Shell_NotifyIcon(NIM_ADD,&data); )y~FeKh  
 ShowWindow(SW_HIDE); ]0[Gc \h}  
 bTray=TRUE; 7kiZFHV  
} FKYPkFB  
+Cs[]~  
void CCaptureDlg::DeleteIcon() KMs[/|HX\  
{ #kGgz O  
 NOTIFYICONDATA data; U`)\|\NY  
 data.cbSize=sizeof(NOTIFYICONDATA); |l\!  
 data.hWnd=GetSafeHwnd(); WG~|sLg  
 data.uID=98; hY*ylzr83  
 Shell_NotifyIcon(NIM_DELETE,&data); qKt*<KGeY  
 ShowWindow(SW_SHOW); &Tc:WD  
 SetForegroundWindow(); qg7qTF&   
 ShowWindow(SW_SHOWNORMAL); 'YQVf]4P  
 bTray=FALSE; {@1;kG  
} ] o!r K<  
:?uUh  
void CCaptureDlg::OnChange() $] ])FM"b  
{ =w&bS,a"y  
 RegisterHotkey(); RSv?imi=  
} u92);1R  
IKz3IR eu  
BOOL CCaptureDlg::RegisterHotkey() : Xe,=M(l~  
{ \,n|V3#G  
 UpdateData(); T[?wbYfW  
 UCHAR mask=0; Uz4!O  
 UCHAR key=0; ;`")3~M3*  
 if(m_bControl) u& 4i=K'x8  
  mask|=4; &*Sgyk o`  
 if(m_bAlt) ;+ -@AYl  
  mask|=2; Fx@ovI- 5  
 if(m_bShift) g?7I7W~?`  
  mask|=1; kjj4%0"  
  key=Key_Table[m_Key.GetCurSel()]; d#tqa`@~  
 if(bRegistered){ i`nmA-Zj[  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); a*hWODYn  
  bRegistered=FALSE; yr;~M{{4  
 } Q>ZxJ!B<k  
 cMask=mask; VtTTvP3  
 cKey=key; Oc,E\~  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ?&gqGU}  
 return bRegistered; (7X|W<xT  
} RJpRsr  
zh.^> `   
  四、小结 o [ Je  
"V= IG{.  
  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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