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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: Y mSaIf  
  udr'~,R  
  一、实现方法 t?&ajh  
*g.,[a0  
  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: CA~S$H\"  
yE/I)GOQjs  
#pragma data_seg("shareddata") %['F[Mo  
HHOOK hHook =NULL; //钩子句柄 Nq1RAM  
UINT nHookCount =0; //挂接的程序数目 8u23@?  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ]qQB+]WN  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Fd0FG A&L  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey A[Xw|9  
static int KeyCount =0; !LESRh?  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 (VR nv  
#pragma data_seg() a[#BlH  
tjL#?j  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 wQ95tN  
yZ6X$I:C  
  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: PSvRO% &  
cZi&L p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR artS*fv3r  
cKey,UCHAR cMask) N4FG_  N  
{ 'a9.JS[pj  
 BOOL bAdded=FALSE; u(qpdG||7  
 for(int index=0;index<MAX_KEY;index++){ Y*Rqgpu $  
  if(hCallWnd[index]==0){ hD=D5LYAZ  
   hCallWnd[index]=hWnd; P=g+6-1  
   HotKey[index]=cKey; KJ |1zCM  
   HotKeyMask[index]=cMask; *V+fRN4 W  
   bAdded=TRUE; '/@VG_9L]  
   KeyCount++; <7h'MNf&  
   break; 'c]&{-w<i  
  } z#ET-[ I  
 } HKf3eC  
 return bAdded; ? -tw*2+  
} iWsIc\!+,  
//删除热键 Oms`i&}"}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~'Hwszp b  
{ 8A=(,)`}9  
 BOOL bRemoved=FALSE; gNBI?xs`p  
 for(int index=0;index<MAX_KEY;index++){ EyiM`)!5  
  if(hCallWnd[index]==hWnd){ 34:=A0z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ d DTt_B  
    hCallWnd[index]=NULL; `8*$$JC  
    HotKey[index]=0; ^^mi@&ApLD  
    HotKeyMask[index]=0; _TiF}b!hi  
    bRemoved=TRUE; Z H*?~ #  
    KeyCount--; &'j77tqOk  
    break; B$n\m854  
   } dWEx55>,1  
  } m[rJFSpef  
 } -A~<IyPt  
 return bRemoved; 0J B"@U&-  
} v\Gu  
QUO?q+  
epePx0N%x$  
  DLL中的钩子函数如下: 36z{TWF  
Sx7xb]3XI"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) NH!! .Z"  
{ 'L7.a'  
 BOOL bProcessed=FALSE; @A%`\Ea%  
 if(HC_ACTION==nCode) B;$5*3D+  
 { ny0`~bl{p  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 rA7S1)Kq  
   switch(wParam) q Sah_N  
   {  f&J*(F*u  
    case VK_MENU: IB<ihk  
     MaskBits&=~ALTBIT; g>{=R|uO5  
     break; Ea 1>]V  
    case VK_CONTROL: [o "@*kf  
     MaskBits&=~CTRLBIT; q}lSnWY[[  
     break; HvU)GJ u b  
    case VK_SHIFT: 0o`o'ZV=c  
     MaskBits&=~SHIFTBIT; /6fsh7 \  
     break; hvwr!(|W  
    default: //judge the key and send message )XWL'':bF  
     break; N[%IrN3  
   } z%z$'m  
   for(int index=0;index<MAX_KEY;index++){ +xa2e?A%L  
    if(hCallWnd[index]==NULL) YrX{,YtiX  
     continue; G5Nub9_*X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y+_U6rv[  
    { 4ai3@f5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); G9TUU.T  
     bProcessed=TRUE;  K!j2AP3  
    } Z(cgI5Pu  
   } G}x^PJJt  
  } 7Udr~ 0_)  
  else if((lParam&0xc000ffff)==1){ //有键按下 g|Cnj  
   switch(wParam) y[# U/2  
   { Z~ (QV0}  
    case VK_MENU: ~EymD *  
     MaskBits|=ALTBIT; =6hf'lP  
     break; /$KW$NH4z  
    case VK_CONTROL: pbNVj~#6  
     MaskBits|=CTRLBIT; 2P*O^-zRp  
     break;  }#1g;  
    case VK_SHIFT: i@6 kI C  
     MaskBits|=SHIFTBIT; uQ}kq7gd  
     break; "lm3o(Dk  
    default: //judge the key and send message -ydT%x  
     break; u=5^xpI<D  
   } k 'o?/  
   for(int index=0;index<MAX_KEY;index++){ `Bx CTwc  
    if(hCallWnd[index]==NULL) \4 DH&gZ[  
     continue; ]`x~v4JU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) l?d*g&  
    { E;SF f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;C3](  
     bProcessed=TRUE;  zcc]5>  
    } [F e5a  
   } U3>G9g>^B  
  } >dO^pDSs  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 {chl+au*l  
   for(int index=0;index<MAX_KEY;index++){ g~]FI  
    if(hCallWnd[index]==NULL) W/+0gh7`,(  
     continue; }5|uA/B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) q>?oV(sF  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); _nF_RpS  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 L3S,*LnA  
   } <?!#QA  
  } 3:r;(IaX  
 } .Q7z<Q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); o Vs&r?\Z  
} hhpH)Bi=  
eG<32$I  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: +aMPwTF:3  
3j6$!89'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); z;LntQZp-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /h;X1Htx}  
?6|EAKJ`lK  
  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: SI\zW[IL  
]Kd:ZmJ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9tJiIr8i  
{ '{EDdlX  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) )%0#XC^/X5  
 { {Q0"uE)-.  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 dPS}\&1  
  SaveBmp(); %*,'&S  
  return FALSE; eD(#zfP/+  
 } #R &F  
 …… //其它处理及默认处理 d)LifsD)  
} ~FJd{$2x`  
Pp?J5HW  
,JR7N_"I  
  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。 B<W{kEY  
2`x[y?Tn  
  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。 TB9ukLG^<<  
NVQ IRQ.  
  二、编程步骤 r__uPyIMG/  
=2< >dM#`  
  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"; 75a3H`  
h_J 'dJS  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ,+f'%)s_x  
KV Mm<]Z  
  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; EBJaFz'  
y5>H>NS  
  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; *9G;n!t  
s i C/k*  
  5、 添加代码,编译运行程序。 9R!.U\sq  
0nC%tCV'  
三、程序代码 cxVnlgq1  
SH"O<c Dp  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL jZ)1]Q2  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) {'JoVJKv  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ d+l@hgz~  
#if _MSC_VER > 1000 &<4Jyhm:o  
#pragma once V^"5cW  
#endif // _MSC_VER > 1000 [H!V  
#ifndef __AFXWIN_H__ 2x0[@cT i?  
#error include 'stdafx.h' before including this file for PCH wj5{f5 RWV  
#endif S?&ntUah  
#include "resource.h" // main symbols uSH.c>  
class CHookApp : public CWinApp (JOge~U  
{ 1aKY+4/G  
 public: qWdL|8  
  CHookApp(); &GX pRo  
  // Overrides ^+I{*0{/[  
  // ClassWizard generated virtual function overrides 26j ; RV  
  //{{AFX_VIRTUAL(CHookApp) C"K(-/  
 public: Z{|wjZb(  
  virtual BOOL InitInstance(); v#F .FK  
  virtual int ExitInstance(); XK>B mq/]  
  //}}AFX_VIRTUAL 4~DoqT  
  //{{AFX_MSG(CHookApp) N|wI=To  
  // NOTE - the ClassWizard will add and remove member functions here. YajUdpJi  
  // DO NOT EDIT what you see in these blocks of generated code ! //xxSk  
  //}}AFX_MSG |?g k%g  
  DECLARE_MESSAGE_MAP() =98@MX%P  
}; [+UF]m%W  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); bNi\+=v<Ys  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?FJU>+{">  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K.B!-<  
BOOL InitHotkey(); d=`hFwD9  
BOOL UnInit(); ngE5$}UM  
#endif ;>bcI).  
EHmw(%a|+  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. }}@x x&  
#include "stdafx.h" id'E_]r  
#include "hook.h" _3.=| @L  
#include <windowsx.h> \G:\36l  
#ifdef _DEBUG ~m'PAC"Q$  
#define new DEBUG_NEW dL!PpLR$2  
#undef THIS_FILE u.43b8!  
static char THIS_FILE[] = __FILE__; :T.j;~  
#endif e2~&I`ct  
#define MAX_KEY 100 N2WQrTA:S+  
#define CTRLBIT 0x04 %8s$l'Q;  
#define ALTBIT 0x02 <;G.(CK@n  
#define SHIFTBIT 0x01 sk6C/ '0:  
#pragma data_seg("shareddata") cyL"?vR*<  
HHOOK hHook =NULL; Yv\>\?865  
UINT nHookCount =0; N$i!25F`  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey K_;'-B  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ]y:2OP  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey +/E`u|%|\]  
static int KeyCount =0; 1%g%I8W%  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 0e-M 24,C  
#pragma data_seg() 7M9Ey29f  
HINSTANCE hins; ' GcN9D  
void VerifyWindow(); 6B'd]Fe  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp)  [,JUC<  
//{{AFX_MSG_MAP(CHookApp) yy8h8{=g  
// NOTE - the ClassWizard will add and remove mapping macros here. ei%L[>N  
// DO NOT EDIT what you see in these blocks of generated code! Pv@Lx+ k  
//}}AFX_MSG_MAP WKek^TW4HE  
END_MESSAGE_MAP() >UlAae44  
/x\{cHAt8J  
CHookApp::CHookApp()  UDl[  
{ k /srT<  
 // TODO: add construction code here, _P,3~ ;  
 // Place all significant initialization in InitInstance xA/Ein0  
} AUBZ7*VO  
j S~W cu  
CHookApp theApp; }&!fT\4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) -k(bM:  
{ GI']&{  
 BOOL bProcessed=FALSE; v"-@'qN'  
 if(HC_ACTION==nCode) <a_ytSoG1  
 { I54`}Npp  
  if((lParam&0xc0000000)==0xc0000000){// Key up 4C m+xAXG  
   switch(wParam) Vh=10Et  
   { U~H]w ,^  
    case VK_MENU: .d/e?H:  
     MaskBits&=~ALTBIT; $IUe](a{d  
     break; Qx<86aKkF  
    case VK_CONTROL: \+3amkBe  
     MaskBits&=~CTRLBIT; d^pzMaCI  
     break; d>k)aIYp  
    case VK_SHIFT: !'#Y-"=ypk  
     MaskBits&=~SHIFTBIT; ?Pbh&!  
     break; o>~xrV`E  
    default: //judge the key and send message PLoD^3uG)  
     break; fRlO.!0(  
   } BeFCt;  
   for(int index=0;index<MAX_KEY;index++){ -aSj-  
    if(hCallWnd[index]==NULL) f~a]og5|G  
     continue; iTUOJ3V7i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _e4%<!1  
    { ( &N`N1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~!//|q^ J]  
     bProcessed=TRUE; #u]'3en  
    } 3pU/Z bb,:  
   } mLGbwm'K  
  } *M^(A}+O  
  else if((lParam&0xc000ffff)==1){ //Key down ?azi(ja  
   switch(wParam) Lfr>y_i;F  
   { Ynxzkm S  
    case VK_MENU: O> .gcLA  
     MaskBits|=ALTBIT; ]&+,`1_q  
     break; iC(&U YL  
    case VK_CONTROL: $e#V^dph  
     MaskBits|=CTRLBIT; 5,vw%F-m  
     break; ^(79SOZC  
    case VK_SHIFT: V)q|U6R  
     MaskBits|=SHIFTBIT; {PBm dX  
     break; D^dos`L0b  
    default: //judge the key and send message fC|NK+Xd`  
     break; m0M;f+^  
   } ais@|s;  
   for(int index=0;index<MAX_KEY;index++) crvq]J5  
   { "1I\~]]  
    if(hCallWnd[index]==NULL) @ vHj>N  
     continue; ]'q"Kw/10  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Fm-D>PR  
    { jt5:rWB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); a|Yry  
     bProcessed=TRUE; CQ;.}=j ,  
    } |g)/6jG<-  
   } (:h#H[F  
  } mto=_|gn  
  if(!bProcessed){ T>P[0`*)  
   for(int index=0;index<MAX_KEY;index++){ rP%B#%;S"  
    if(hCallWnd[index]==NULL) sR;^7(f!m  
     continue; 3OZu v};k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /k_?S?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); md S`nhb  
   } r P1FM1"M  
  } GI. =\s  
 } B QxU~s  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3{/[gX9  
} ))NiX^)8^  
SJ0IEPk  
BOOL InitHotkey() {BI5lvx:  
{ F'Lav?^  
 if(hHook!=NULL){ yb4Jsk5%  
  nHookCount++; LFwRTY,G  
  return TRUE; | > t,1T.  
 } ]:g;S,{  
 else \A%s" O/  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 'O:QS)  
  if(hHook!=NULL) x )w6  
   nHookCount++; 9$Dsm@tX  
  return (hHook!=NULL); Z23*`yR  
} (U?*Z/  
BOOL UnInit() Bk44 wz2 X  
{ !8jr $  
 if(nHookCount>1){ N.1 @!\z@@  
  nHookCount--; h+d  \u  
  return TRUE; u&-Zh@;Q7  
 } 'h*^;3@*  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .5AyB9a%&  
 if(unhooked==TRUE){ I 7 B$X=  
  nHookCount=0; XLq%nVBM8\  
  hHook=NULL; Gm1[PAj  
 } y/9aI/O'  
 return unhooked; C]01(UoSZ  
} D-KQRe2@  
aK+jpi4?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) IUZ@n0/T  
{ K (!+l  
 BOOL bAdded=FALSE; Tm) (?y  
 for(int index=0;index<MAX_KEY;index++){ kD?lMA__  
  if(hCallWnd[index]==0){ tqYwP Sr  
   hCallWnd[index]=hWnd; :Sc"fG,g)  
   HotKey[index]=cKey; 3*<?'O7I0  
   HotKeyMask[index]=cMask; 5vSJjhS  
   bAdded=TRUE; |%HTBF  
   KeyCount++; |G(9mnZ1  
   break; ba`V`0p-(  
  } ~9Jlb-*I5  
 } r@)_>(  
 return bAdded; NW%u#MZ[h  
} qGK -f4  
Li2-G  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Bsc&#  
{ _VM()n;  
 BOOL bRemoved=FALSE; }@Dgr)*+  
 for(int index=0;index<MAX_KEY;index++){ *p  !F+"  
  if(hCallWnd[index]==hWnd){ 4n5r<?rY  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ G[4$@{  
    hCallWnd[index]=NULL; #[LnDU8>9  
    HotKey[index]=0; yE{(Ebm  
    HotKeyMask[index]=0; `{v!|.d<  
    bRemoved=TRUE; ,e93I6  
    KeyCount--; r2.f8U  
    break; +#@)C?G,TF  
   } QKVFH:"3  
  } (fUpj^E)p  
 } [G#PK5C  
 return bRemoved; _Yqog/sG  
} SSH 1Ge5|  
@4FG & >kQ  
void VerifyWindow() Bkaupvv9S  
{ ]Te,m}E  
 for(int i=0;i<MAX_KEY;i++){ xa&5o`>1G  
  if(hCallWnd!=NULL){ Y Z.? k4>  
   if(!IsWindow(hCallWnd)){ -#agWqUM|T  
    hCallWnd=NULL; ]ML(=7z"  
    HotKey=0; M[1!#Q><!  
    HotKeyMask=0; IizPu4|  
    KeyCount--; ^Ee"w7XjD  
   } a\]g lw\;  
  } At$[&%}  
 } I|eYeJ3  
} m6 V L  
edZhI  
BOOL CHookApp::InitInstance() VxTrL}{(6  
{ z-g"`w:Lj  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); (;6vT'hE  
 hins=AfxGetInstanceHandle(); uJ@C-/BD!M  
 InitHotkey(); _Gb O>'kE  
 return CWinApp::InitInstance(); gAxf5 A_x)  
} 1Ht&;V  
kH|cB!?x  
int CHookApp::ExitInstance() [,?5}'we  
{ XtP5IN\S  
 VerifyWindow(); *74VrAo  
 UnInit(); lD41+x 7  
 return CWinApp::ExitInstance(); ?#]wx H,  
} ^Yg}>?0  
VlbS\Y.  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file wRsh@I<  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Mep ct  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ M9ACaf@  
#if _MSC_VER > 1000 `"RT(` m  
#pragma once ?j^:jV  
#endif // _MSC_VER > 1000 [==x4N b  
FA7q pc  
class CCaptureDlg : public CDialog U ,7O{YM  
{ 4Uzx2   
 // Construction 2, R5mL$  
 public: `-)Hot)  
  BOOL bTray; 1n-+IR"  
  BOOL bRegistered; FofeQ  
  BOOL RegisterHotkey(); A(v5VvgZE  
  UCHAR cKey; {1Hs5bg@  
  UCHAR cMask; Q xm:5P  
  void DeleteIcon(); )0UXTyw^  
  void AddIcon(); eJ3;Sd''  
  UINT nCount; #Et%s8{  
  void SaveBmp(); a]4h5kJ';  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 'fS&WVR?  
  // Dialog Data i8Xz'Sw07  
  //{{AFX_DATA(CCaptureDlg) XN %tcaY  
  enum { IDD = IDD_CAPTURE_DIALOG }; 0T7c=5z4W  
  CComboBox m_Key; -)E nr6  
  BOOL m_bControl; yO*HJpc   
  BOOL m_bAlt; #sHt3z)6I  
  BOOL m_bShift; $Si|;j$?  
  CString m_Path; ==]BrhZK  
  CString m_Number; e?yrx6  
  //}}AFX_DATA LE]mguvs  
  // ClassWizard generated virtual function overrides Sece#K2J|  
  //{{AFX_VIRTUAL(CCaptureDlg) -F~"W@9r  
 public: 4uy:sCmu  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 9ymx;  
 protected: W\1V`\gF  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2uT"LW/(H  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 8D:0Vhx\I  
  //}}AFX_VIRTUAL D4IP$pAD  
  // Implementation oUNuM%g9Dy  
 protected: Dhze2q)o  
  HICON m_hIcon; b2Oj 1dP1  
  // Generated message map functions Zp qb0ro  
  //{{AFX_MSG(CCaptureDlg) HF;$Wf+=J  
  virtual BOOL OnInitDialog(); MfG8=H2#|  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); PW QRy  
  afx_msg void OnPaint(); MiN|u  
  afx_msg HCURSOR OnQueryDragIcon(); kR/Etm5_  
  virtual void OnCancel(); 3;Y 9<  
  afx_msg void OnAbout(); @|6#]&v`  
  afx_msg void OnBrowse(); $az9Fmta  
  afx_msg void OnChange(); G:4'')T  
 //}}AFX_MSG @wPyXl  
 DECLARE_MESSAGE_MAP() |y.^F3PE  
}; U-:"Wx%G  
#endif \m%Z;xKG  
%n)H(QPW  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 5KgAY;|  
#include "stdafx.h" @O9wit.  
#include "Capture.h" ,vs#(d6G  
#include "CaptureDlg.h" hq*"S -N  
#include <windowsx.h> ,*m{Q  
#pragma comment(lib,"hook.lib") PUbfQg  
#ifdef _DEBUG 5iZx -M  
#define new DEBUG_NEW hn[lhC  
#undef THIS_FILE opfg %*  
static char THIS_FILE[] = __FILE__; _X)`S"EsJ  
#endif ^`+Kjhht  
#define IDM_SHELL WM_USER+1 ?X^.2+]*&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); S(#v<C,hd  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]Il}ymkIZ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 8/"R&yAh  
class CAboutDlg : public CDialog WbJ  
{ (MzThGJK_  
 public: 7!PU}[:  
  CAboutDlg(); +. tcEbFL  
  // Dialog Data oZ\zi> Y,  
  //{{AFX_DATA(CAboutDlg) ]QSQr *  
  enum { IDD = IDD_ABOUTBOX }; k< $(  
  //}}AFX_DATA ~@d4p|K  
  // ClassWizard generated virtual function overrides `b*x}HP$  
  //{{AFX_VIRTUAL(CAboutDlg) M~l\rg8  
 protected: vn1*D-?  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support w:h([q4X  
  //}}AFX_VIRTUAL MHQM'  
  // Implementation THy{r_dx  
 protected: AYsiaSTRqW  
  //{{AFX_MSG(CAboutDlg) ,Q,3^v-  
  //}}AFX_MSG e !N%   
  DECLARE_MESSAGE_MAP() 'b:UafV  
}; 4Hq6nT/  
bPA1>p7  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) mt\pndTy7!  
{ R/P9=yvg0  
 //{{AFX_DATA_INIT(CAboutDlg) hka`STK{  
 //}}AFX_DATA_INIT OLE@35"v]  
} ;T3}#Q*qC  
r1a/'+   
void CAboutDlg::DoDataExchange(CDataExchange* pDX) S N ;1F  
{ FV\$M6 _  
 CDialog::DoDataExchange(pDX); oD 3Q{ e  
 //{{AFX_DATA_MAP(CAboutDlg) ,% *Jm  
 //}}AFX_DATA_MAP yC\!6pg  
} C:ntr=3J  
(V<pz2\  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) R47tg&k6[  
 //{{AFX_MSG_MAP(CAboutDlg) y\XWg`X y  
 // No message handlers g`I$U%a_2  
 //}}AFX_MSG_MAP CZ.HQc  
END_MESSAGE_MAP() 51'{Jx8  
?o`fX wE  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) gr\vC  
: CDialog(CCaptureDlg::IDD, pParent) C)BVsHT4  
{ ^2LqKo\T  
 //{{AFX_DATA_INIT(CCaptureDlg) (".WJXB\  
  m_bControl = FALSE; 8V@\$4@b!#  
  m_bAlt = FALSE; L8?;A9pc()  
  m_bShift = FALSE; plgiQr #  
  m_Path = _T("c:\\"); pGP$2  
  m_Number = _T("0 picture captured."); u& <NBxY  
  nCount=0; e$N1m:1*  
  bRegistered=FALSE; I>:.fHvUC  
  bTray=FALSE; xcX^L84\  
 //}}AFX_DATA_INIT 4%*`' o$_  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 AH|'{  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); J5SOPG  
} d=/a{lP\  
Xp~O?2:3l  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) +^3 *Y"6Z  
{ )NnkoCNeE  
 CDialog::DoDataExchange(pDX); DEt;$>tl 5  
 //{{AFX_DATA_MAP(CCaptureDlg) O5dBI_  
  DDX_Control(pDX, IDC_KEY, m_Key); (d#W3  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); qb KcI+)47  
  DDX_Check(pDX, IDC_ALT, m_bAlt); YJ{_%z|U  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ESi-'R&  
  DDX_Text(pDX, IDC_PATH, m_Path); mhMRY9ahB  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 4 IXa[xAm  
 //}}AFX_DATA_MAP xPMX\aI|l  
} <5npVm  
T#ehJq 5  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) [='<K  
//{{AFX_MSG_MAP(CCaptureDlg) F32U;fp3  
 ON_WM_SYSCOMMAND() LsaRw-4.c  
 ON_WM_PAINT() }0 =gP?.kE  
 ON_WM_QUERYDRAGICON() gsVm)mkd  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) oB%j3aAH  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) M7c53fz  
 ON_BN_CLICKED(ID_CHANGE, OnChange) .83z =  
//}}AFX_MSG_MAP k@Bn}r  
END_MESSAGE_MAP()  EHda  
]]/p.#oD,  
BOOL CCaptureDlg::OnInitDialog() N[wyi&m4  
{ oD_#oX5\  
 CDialog::OnInitDialog(); %kL]-Z  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); w C-x'  
 ASSERT(IDM_ABOUTBOX < 0xF000); T^H`$;\  
 CMenu* pSysMenu = GetSystemMenu(FALSE); *wV`7\@  
 if (pSysMenu != NULL) L87=*_!B;  
 { I ka V g L  
  CString strAboutMenu; >:P-3#e*  
  strAboutMenu.LoadString(IDS_ABOUTBOX); CM 8Ub%  
  if (!strAboutMenu.IsEmpty()) rQ&F Gb  
  { g&O!w!T  
   pSysMenu->AppendMenu(MF_SEPARATOR); +A<7:`sO  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); p"Q V| `  
  } '/@i} digf  
 } 7F8>w 7Y]  
 SetIcon(m_hIcon, TRUE); // Set big icon iQz c$y^,9  
 SetIcon(m_hIcon, FALSE); // Set small icon 54%h)dLDy  
 m_Key.SetCurSel(0); /igbn  
 RegisterHotkey(); v,Yz\onB^  
 CMenu* pMenu=GetSystemMenu(FALSE); gF&HJF 0x  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ju(QSZ|;  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); `:5W1D(  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); y])z,#%ED  
 return TRUE; // return TRUE unless you set the focus to a control U_Am Riy  
} ya'OI P `  
z5 :53,`D'  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) xB,(!0{`  
{ 7r$'2">K(  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) fe7DS)U  
 { zwdi$rM5  
  CAboutDlg dlgAbout; Q9sxI}D )R  
  dlgAbout.DoModal(); d5 U+]g  
 } ?o_ D#gG*  
 else ,{sCI/  
 { CChCxB  
  CDialog::OnSysCommand(nID, lParam); +t p@Tb  
 } 7_ao?}g  
} hlBqcOpkKg  
~4u[\&Sh  
void CCaptureDlg::OnPaint() 6q@VkzF  
{ AHdh]pfH  
 if (IsIconic()) U[c^xz&  
 { jmva0K},SE  
  CPaintDC dc(this); // device context for painting 99?: 9g  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); P~u~`eH*  
  // Center icon in client rectangle d1n*wVl  
  int cxIcon = GetSystemMetrics(SM_CXICON); <amdPo+2D  
  int cyIcon = GetSystemMetrics(SM_CYICON); t"FB}%G  
  CRect rect; 6F08$,%Y  
  GetClientRect(&rect);  bj U]]  
  int x = (rect.Width() - cxIcon + 1) / 2; K6e_RzP,.w  
  int y = (rect.Height() - cyIcon + 1) / 2; mW_ N-z  
  // Draw the icon ;09U*S$eK  
  dc.DrawIcon(x, y, m_hIcon); gIcm`5+T  
 } gBJM|"_A?  
 else K)TMr"j\  
 { NEcE -7aT  
  CDialog::OnPaint(); #H&`wMZZ:  
 } j4!oBSp  
} k{.`=j  
btv.M  
HCURSOR CCaptureDlg::OnQueryDragIcon() v>p}f"$`  
{ 17@#"uT0  
 return (HCURSOR) m_hIcon; 5/4q}U3  
} *)um^O  
k+y>xI,  
void CCaptureDlg::OnCancel() ^Mi&2AvS  
{ E~eSHJ(oR7  
 if(bTray) p^9u8T4l1  
  DeleteIcon(); LLW xzu!<  
  CDialog::OnCancel(); -%>.Z1uj  
} ql%]t~HR0  
'A#F< x  
void CCaptureDlg::OnAbout() /|aD,JVN"  
{ UeN+}`!l  
 CAboutDlg dlg; <#No t1R  
 dlg.DoModal(); ;8> TD&]{  
} `T~~yM)q  
rd!4u14  
void CCaptureDlg::OnBrowse() g;t>jgX  
{ G| .5.FK^  
 CString str; 1g bqHxWI  
 BROWSEINFO bi; -+Ab[  
 char name[MAX_PATH]; s.K Hm L3  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ew\ZFqA;  
 bi.hwndOwner=GetSafeHwnd(); Q*l_QnfG  
 bi.pszDisplayName=name; LM?UV)  
 bi.lpszTitle="Select folder"; 8ZvozQE  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; wU)vJsOq  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); +N>&b%  
 if(idl==NULL) /GMT  
  return; Mh*^@_h?  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); }@avG t;v  
 str.ReleaseBuffer(); }^}ep2^  
 m_Path=str; Jevr.&;O  
 if(str.GetAt(str.GetLength()-1)!='\\') K9+%rqC.|`  
  m_Path+="\\"; ?s5hck hh  
 UpdateData(FALSE); */E5<DO  
} =U_O;NC  
}='1<~0  
void CCaptureDlg::SaveBmp() <ZgbmRY8  
{ M3/_E7Qoj  
 CDC dc; gDBdaxR<  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 'n0u6hCSb  
 CBitmap bm; ,pMH`  
 int Width=GetSystemMetrics(SM_CXSCREEN); ds D!)$  
 int Height=GetSystemMetrics(SM_CYSCREEN); c(G;O )ikS  
 bm.CreateCompatibleBitmap(&dc,Width,Height); KiO1l{.s8n  
 CDC tdc; 8sGaq [  
 tdc.CreateCompatibleDC(&dc); *:hHlH* t1  
 CBitmap*pOld=tdc.SelectObject(&bm); 5p`.RWls  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); D_)n\(3  
 tdc.SelectObject(pOld); zTQTmO  
 BITMAP btm; ~ (/OB w  
 bm.GetBitmap(&btm); 9_<>#)u5  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; tv8}O([  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Mo_(WSs  
 BITMAPINFOHEADER bih; "0#d F:qt  
 bih.biBitCount=btm.bmBitsPixel; H:>i:\J/M9  
 bih.biClrImportant=0; *mTx0sQz(J  
 bih.biClrUsed=0; 1Wy0#?L  
 bih.biCompression=0; N)N\iad^  
 bih.biHeight=btm.bmHeight; y:+4-1  
 bih.biPlanes=1; f*& 4d  
 bih.biSize=sizeof(BITMAPINFOHEADER); y?*4SLy  
 bih.biSizeImage=size; MH=;[| N  
 bih.biWidth=btm.bmWidth; Zcg@]Sx(I  
 bih.biXPelsPerMeter=0; K84Ve Ae  
 bih.biYPelsPerMeter=0; f hS4Gb_  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); O0Sk?uJ <  
 static int filecount=0; ^P !} "  
 CString name; K|g+W t^tQ  
 name.Format("pict%04d.bmp",filecount++); fkmN?CU{1%  
 name=m_Path+name; 8 s#2Zv  
 BITMAPFILEHEADER bfh; i $:QOMA  
 bfh.bfReserved1=bfh.bfReserved2=0; M h5>@-fEE  
 bfh.bfType=((WORD)('M'<< 8)|'B'); A9L {c!|-  
 bfh.bfSize=54+size; F ;;\I  
 bfh.bfOffBits=54; %an&lcoX  
 CFile bf; C!Oz'~l  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .PJCBT e  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); LIZsDTU  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); XAF*jevr  
  bf.WriteHuge(lpData,size); -"Hy%wE  
  bf.Close(); ~v+A6N:qC  
  nCount++; NwPC9!*  
 } smTPca)7s  
 GlobalFreePtr(lpData); QKt[Kte  
 if(nCount==1) EvQMt0[?EW  
  m_Number.Format("%d picture captured.",nCount); zUCtH*  
 else jdWA)N}kDG  
  m_Number.Format("%d pictures captured.",nCount); dZ"w2ho  
  UpdateData(FALSE); ROc)LCA  
} "ABg,^jf  
MmPLJ  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) s 8 c#_  
{ WY 'QhieH  
 if(pMsg -> message == WM_KEYDOWN) ueD_<KjE=  
 { 4itadQS  
  if(pMsg -> wParam == VK_ESCAPE) %;-] HI  
   return TRUE; u~y0H  
  if(pMsg -> wParam == VK_RETURN) fce~a\y0  
   return TRUE; AV%t<fDG#  
 } /$NZj" #  
 return CDialog::PreTranslateMessage(pMsg); o+j~~P  
} <+\ w.!  
M!j: 2dT"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _cw~N p  
{ ]> dCt<  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ "ke>O'   
  SaveBmp(); g=5vnY  
  return FALSE; XV|u!'Ey  
} _2N7E#m"S  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ "Smek#l  
 CMenu pop; dnW#"  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); g4-UBDtYt  
 CMenu*pMenu=pop.GetSubMenu(0); K[~fpQGbV1  
 pMenu->SetDefaultItem(ID_EXITICON); mv;;0xH  
 CPoint pt; -{ M(1vV(=  
 GetCursorPos(&pt); N& 683z  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); rE[:j2HF  
 if(id==ID_EXITICON) i,z^#b7JQ  
  DeleteIcon(); B{ptP4As-  
 else if(id==ID_EXIT) aUTXg60l*  
  OnCancel(); ta'{S=^j  
 return FALSE; 'W2B**}  
} ?7]UbtW[  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); / 8 0Q  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 2Sg^SZFH+o  
 AddIcon(); ,/uVq G  
 return res; 0 P]+/  
} >q !:*  
ZP}NFh%,u  
void CCaptureDlg::AddIcon() "f5neW  
{ #D2.RN  
 NOTIFYICONDATA data; Y"dUxv1Ap  
 data.cbSize=sizeof(NOTIFYICONDATA); X}@'FxIF  
 CString tip; 4u.Fy<+@4M  
 tip.LoadString(IDS_ICONTIP); 2YV*U_\L  
 data.hIcon=GetIcon(0); H0P:t(<Gt  
 data.hWnd=GetSafeHwnd(); gXP)YN  
 strcpy(data.szTip,tip); aR0'$*3E  
 data.uCallbackMessage=IDM_SHELL; M8p6f)l3  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 9ER!K  
 data.uID=98; A0f98 ?j^  
 Shell_NotifyIcon(NIM_ADD,&data); {/E_l  
 ShowWindow(SW_HIDE); {`>;I  
 bTray=TRUE; lK 0pr  
} sJ !<qb5!  
.WV5Gf)  
void CCaptureDlg::DeleteIcon() %c"t`  
{ nA)KRCi  
 NOTIFYICONDATA data; LZ 3PQL  
 data.cbSize=sizeof(NOTIFYICONDATA); a58]#L~  
 data.hWnd=GetSafeHwnd(); 5H!6 #pqM  
 data.uID=98; LeT OVgjA|  
 Shell_NotifyIcon(NIM_DELETE,&data); $(=0J*ND"  
 ShowWindow(SW_SHOW); xb22 :  
 SetForegroundWindow(); EK=PY  
 ShowWindow(SW_SHOWNORMAL); 7q;wj~  
 bTray=FALSE; Q]7}" B&  
} L55VS:'  
z3mo2e  
void CCaptureDlg::OnChange() S+* g  
{ ZK p9k6  
 RegisterHotkey(); T5gL  
} EjDr   
qQ T ^d  
BOOL CCaptureDlg::RegisterHotkey() Mr6q7  
{ l?Qbwv}  
 UpdateData(); HV}*}Ty  
 UCHAR mask=0; OB5t+_ s  
 UCHAR key=0; "eb+O  
 if(m_bControl) !bGMVw6_  
  mask|=4; __OH gp 1  
 if(m_bAlt) *< ?~  
  mask|=2; y|Vwy4tK9  
 if(m_bShift) 'U/X<LCl  
  mask|=1; 'irHpN6n  
  key=Key_Table[m_Key.GetCurSel()]; nKu)j3o`  
 if(bRegistered){ Vu1swq)l  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); :)g}x&A^$  
  bRegistered=FALSE; ,GTIpPj  
 } }*>xSb1  
 cMask=mask; 3Q\k!$zq  
 cKey=key; *Al`QEW  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Q@aDa8Z  
 return bRegistered; ,E3Ze*(U  
} ^EF VjGM  
S #6:!  
  四、小结 <]wQ;14;H  
O;C C(  
  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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