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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: GG %*d]  
  ($Q|9>5,  
  一、实现方法 eCjyx|:J  
[&sabM`Ul  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: -ND1+`yD  
-_BX\iP{  
#pragma data_seg("shareddata") cq~~a(IS  
HHOOK hHook =NULL; //钩子句柄 2oo\SmO]  
UINT nHookCount =0; //挂接的程序数目 J\hqK*/8  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Ze?n Q-  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?{%"v\w  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 'HJ<"<  
static int KeyCount =0; 0IyT(1hS  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 3QCCX$,  
#pragma data_seg() qOflvf  
S2 MJb  
  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。 %-<6Z9otc  
G^:?)WRG  
  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: afE8Kqa:H  
7LsVlT[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR "dHo6CT,y_  
cKey,UCHAR cMask) )cU$I)  
{ %awr3h>$  
 BOOL bAdded=FALSE; 5[]Yxl  
 for(int index=0;index<MAX_KEY;index++){ 5!BW!-q  
  if(hCallWnd[index]==0){ HV{W7)  
   hCallWnd[index]=hWnd;  0:$pJtx"  
   HotKey[index]=cKey; O~|Y#T  
   HotKeyMask[index]=cMask; xy]oj  
   bAdded=TRUE; r-No\u_  
   KeyCount++; piFZu/~Gq\  
   break; 8WpZ "  
  } @w(X}q1  
 } Z+_xX  
 return bAdded; Y+eDE:4  
} |3g'~E?$  
//删除热键 %$N,6}n  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?3gf)g=  
{ DDj:(I?,w  
 BOOL bRemoved=FALSE; AWg'J  
 for(int index=0;index<MAX_KEY;index++){ HMhdK  
  if(hCallWnd[index]==hWnd){ ,z#S=I  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0,B"p  
    hCallWnd[index]=NULL; ]"'1-h91  
    HotKey[index]=0; Bm  4$  
    HotKeyMask[index]=0; 3|%058bF  
    bRemoved=TRUE; a7aj:.wi  
    KeyCount--; P1R[M|Fx  
    break; %~[@5<p  
   } h)^|VM   
  } zU'7x U-  
 } 7C wWf  
 return bRemoved; S R s  
} .\ :MB7p  
tAkv'.  
5> !N)pA  
  DLL中的钩子函数如下: 'EN80+xYX  
FSkLR h  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `6(Zc"/ \m  
{ |Mgzb0_IiQ  
 BOOL bProcessed=FALSE; '7g]@Q7  
 if(HC_ACTION==nCode) z:=E- +  
 { :<HLw.4O  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ;]k\F  
   switch(wParam) (gIFuOGi>  
   {  ;*hVAxs1  
    case VK_MENU: jhJ<JDJ?`  
     MaskBits&=~ALTBIT; '(-H#D.oy'  
     break; O;|jLf_If  
    case VK_CONTROL: a:;7'w'  
     MaskBits&=~CTRLBIT; #Z,@yJ2wl  
     break; dptfIBYc+  
    case VK_SHIFT: !x! 1H5"  
     MaskBits&=~SHIFTBIT; bXA%|7*  
     break; WWC&-Ni  
    default: //judge the key and send message @>&b&uj7T  
     break; x~F YG  
   } 7a=ul:  
   for(int index=0;index<MAX_KEY;index++){ O:ACp<@  
    if(hCallWnd[index]==NULL) =Y*@8=V  
     continue; >M0^R} v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <[$a7l i  
    { ]x(6^:D5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Dl,sl>{  
     bProcessed=TRUE; Sj o-Xf}  
    } lMcO2006L  
   } @bChJl4  
  } v+o6ZNX  
  else if((lParam&0xc000ffff)==1){ //有键按下 '}:(y$9.`  
   switch(wParam) ].sD#~L_  
   { C-g,uARX(r  
    case VK_MENU: Z<QNzJ D  
     MaskBits|=ALTBIT; pH(X;OC 9S  
     break; s p+'c;a  
    case VK_CONTROL: ,3!TyQ \m'  
     MaskBits|=CTRLBIT; 3!%-O:!  
     break; E)wf'x  
    case VK_SHIFT: PXML1.r$Q  
     MaskBits|=SHIFTBIT; e,d}4 jy  
     break; @|s$ :;(=  
    default: //judge the key and send message HU$]o N  
     break; F'CJN$6Mw/  
   } 5,-:31(j\  
   for(int index=0;index<MAX_KEY;index++){ MNp4=R  
    if(hCallWnd[index]==NULL) AMASh*  
     continue; KzQFG)q,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y:_>R=sw  
    { ,v`03?8l(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); I8c:U2D  
     bProcessed=TRUE; p'6XF{  
    } Zrj#4 E1  
   } 0|C !n+OK  
  } %m [l/,2x  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 bdfs'udt9  
   for(int index=0;index<MAX_KEY;index++){ R0mkEM  
    if(hCallWnd[index]==NULL) j<`3xd'  
     continue; `VvQems  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 8(\J~I[^  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); FA := )  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 947;6a%$  
   } vif)g6,  
  } w'XN<RWA  
 } j\zlp  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); r^H,H'BohJ  
} /^v!B`A @  
9JX@c k  
  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: {:3:GdM6  
%3AE2"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); pvb&vtp  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l<+PA$+}}  
%nG>3.%  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ^Wn+G8n  
FnI}N;"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #)@#Qd  
{ e\^}PU  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) G!wb|-4<$  
 { 6b$C/  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 `)4v Q+A>  
  SaveBmp(); lrL:G[rt  
  return FALSE; Dr[;\/|#  
 } a)c;z@r  
 …… //其它处理及默认处理 =f [/Pv  
} .lM]>y)  
2,^ > lY  
U_;="y  
  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。 -7'|&zP  
bfm+!9=9S  
  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。 0pG + yec  
N%ccy?B  
  二、编程步骤 &[ ],rT  
qL`yaU  
  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"; ZI1*Cb  
'[HQ}Wvn  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; >`/s+V  
cvE)  
  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; QgQclML1|  
Qe-Pg^PS]  
  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; D~Ef%!&  
KUK.;gG*Z  
  5、 添加代码,编译运行程序。 4_sJ0=z-  
]9)iBvQlj  
三、程序代码 #sBL E  
6 eu7&Kj'  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 0rz1b6F5,  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) JtsXMZz  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ l'@!'  
#if _MSC_VER > 1000 B3D}'<  
#pragma once VBS}2>p  
#endif // _MSC_VER > 1000 "A&A?%  
#ifndef __AFXWIN_H__ "'@D\e}  
#error include 'stdafx.h' before including this file for PCH 7Z~JuTIZ  
#endif *9xxX,QT8Q  
#include "resource.h" // main symbols <2L,+  
class CHookApp : public CWinApp %{pjC7j#  
{ fA]sPh4Uag  
 public: 023uAaI^3r  
  CHookApp(); ~d1=_p:~T  
  // Overrides x X[WX#'f  
  // ClassWizard generated virtual function overrides XjP &  
  //{{AFX_VIRTUAL(CHookApp) /#SfgcDt  
 public: 9_F&G('V{a  
  virtual BOOL InitInstance(); ]7>#YKH.  
  virtual int ExitInstance(); l6 }+,v@#  
  //}}AFX_VIRTUAL f~PS'I_r  
  //{{AFX_MSG(CHookApp) 7R m\#  
  // NOTE - the ClassWizard will add and remove member functions here. NZ&ZK@h}.  
  // DO NOT EDIT what you see in these blocks of generated code ! UKV<Ye|  
  //}}AFX_MSG x?lRObHK  
  DECLARE_MESSAGE_MAP() `LLmdm 6i  
}; /5z,G r  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); " DLIx}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5c(g7N  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); " C&>$h_%  
BOOL InitHotkey(); Lwx J:Kz.  
BOOL UnInit(); bvrXz-j  
#endif - 0q263z  
_9H]:]1QH  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. d>W#c8X>  
#include "stdafx.h" Y`{62J8oy  
#include "hook.h" i2rSP$j  
#include <windowsx.h> [Gv8Fn/aG  
#ifdef _DEBUG !g6=/9  
#define new DEBUG_NEW lY(_e#  
#undef THIS_FILE >ov#\  
static char THIS_FILE[] = __FILE__; R@s|bs?  
#endif i+in?!@G:  
#define MAX_KEY 100 !Q_Wbu\U  
#define CTRLBIT 0x04 G`jvy@  
#define ALTBIT 0x02 je2"D7D  
#define SHIFTBIT 0x01 K]Vp! G  
#pragma data_seg("shareddata") )=X g  
HHOOK hHook =NULL; MffCk!]  
UINT nHookCount =0; QV HI}3~  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ='w 2"4  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 2Xk;]-T!  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey r|*_KQq  
static int KeyCount =0; B(vCi^  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Z<^EZX3N  
#pragma data_seg() [7~AWZU3  
HINSTANCE hins; J$5 G8<d>  
void VerifyWindow(); ?Js4 \X!uJ  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) gq 3|vzNZ  
//{{AFX_MSG_MAP(CHookApp) B8"c+<b  
// NOTE - the ClassWizard will add and remove mapping macros here. @#hvQ6u  
// DO NOT EDIT what you see in these blocks of generated code! .w@B )f*  
//}}AFX_MSG_MAP +Ek1~i.  
END_MESSAGE_MAP() 9W]OtSG  
1n}#54  
CHookApp::CHookApp() 8> $=p4bf  
{ (n: A` ]  
 // TODO: add construction code here, XNfl  
 // Place all significant initialization in InitInstance _'1 ]CoR  
} 9ZU^([@D  
f=Pn,.>tIz  
CHookApp theApp; _deEs5i  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) X$1YvYsID  
{ J?X{NARt  
 BOOL bProcessed=FALSE; fe`_0lxj  
 if(HC_ACTION==nCode) _[rQt8zn  
 { dQ-shfTr]  
  if((lParam&0xc0000000)==0xc0000000){// Key up j$XaO%y)  
   switch(wParam) v=hn# U  
   { xyM|q9Gf@  
    case VK_MENU: &0y` Gt  
     MaskBits&=~ALTBIT; &Wb"/Hn2  
     break; "u^vBd[}  
    case VK_CONTROL: .U@u |  
     MaskBits&=~CTRLBIT; ~$C<^?"b  
     break; Gos# =H  
    case VK_SHIFT: m%[/w wL  
     MaskBits&=~SHIFTBIT; AkW>*x  
     break; BY[7`@  
    default: //judge the key and send message t2OBVzK  
     break; na8`V`77  
   } B0)|sH  
   for(int index=0;index<MAX_KEY;index++){ EirZ}fDJzB  
    if(hCallWnd[index]==NULL) 7)[Ve1;/N  
     continue; +[MHl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i/'bpGrQ(  
    { &g5PPQ18  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ! }e75=x  
     bProcessed=TRUE; ik/ X!YTu*  
    } NziCN*6  
   } 3imsIBr  
  } X<Cf y  
  else if((lParam&0xc000ffff)==1){ //Key down s !2Iui @  
   switch(wParam) NyRa.hgZ;  
   { Hd\oV^ >  
    case VK_MENU: qwJp&6  
     MaskBits|=ALTBIT; UjoA$A!Od;  
     break; (BxmV1  
    case VK_CONTROL: w:deQ:k  
     MaskBits|=CTRLBIT;  ^,ISz-4  
     break; D84&=EpVZ  
    case VK_SHIFT: : 7"Q  
     MaskBits|=SHIFTBIT; ;zo|. YD  
     break; Sa9VwVUE  
    default: //judge the key and send message MI(#~\Y~P  
     break; *P7/ry^<F  
   } siCm)B  
   for(int index=0;index<MAX_KEY;index++) W!O/t^H>  
   { )$i,e`T   
    if(hCallWnd[index]==NULL) +"BJjxG  
     continue; [ei~Xkzkj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %s+'"E"E  
    { R6fkc^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Nj2l>[L;  
     bProcessed=TRUE; /t7f5mA  
    } .AO-S)wHR  
   } b=2:\F  
  } hbvcIGaT  
  if(!bProcessed){ '1b)(IW  
   for(int index=0;index<MAX_KEY;index++){ 9@ fSO<  
    if(hCallWnd[index]==NULL) CR9wp] -Vd  
     continue; % PB{jo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) P/1YN  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 1|xe'w{  
   } D^m2iW;  
  } 0?/gEr  
 } ^zO{Aks  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); s K+uwt  
} 9U.Ctx:F  
!i (V.A  
BOOL InitHotkey() fi*b]a\'  
{ < B]qqqP  
 if(hHook!=NULL){ "p;tj74O9  
  nHookCount++; j xkQ #Y  
  return TRUE; &uO-h  
 } 612,J  
 else F$ G)vskd  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); '5$@ I{z  
  if(hHook!=NULL) =gR/ t@Ld  
   nHookCount++; .0xk},  
  return (hHook!=NULL);  cf,6";8  
} `4xQ#K.-  
BOOL UnInit() YU[#4f~  
{ ?G',Qtz<K  
 if(nHookCount>1){ tl!dRV92  
  nHookCount--; AQQa6Ce*  
  return TRUE; gM;m{gXYK  
 } DMch88W  
 BOOL unhooked = UnhookWindowsHookEx(hHook);  \SQ4yc  
 if(unhooked==TRUE){ ^(C4Q?[2m  
  nHookCount=0; LkzA_|8:D  
  hHook=NULL; e_|<tYx><  
 } 98 5h]KQ  
 return unhooked; v.C  
} "PRHQW  
8M,o)oH  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q0jg(=9wP  
{ ]nRf%Vi8g  
 BOOL bAdded=FALSE; 57;0,k5Gy  
 for(int index=0;index<MAX_KEY;index++){ 5,^DT15a4P  
  if(hCallWnd[index]==0){ G,?a8(  
   hCallWnd[index]=hWnd; 8r+u!$i!H  
   HotKey[index]=cKey;  {p/Yz#  
   HotKeyMask[index]=cMask; WUz69o be  
   bAdded=TRUE; gvWgw7z  
   KeyCount++; 8g_kZ^<[  
   break; +VW8{=$  
  } \7qj hA@  
 } vI(LIfe;  
 return bAdded; 1I69O6"  
} Et }%)M  
_)= e`9%  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) nZ'jjS[!  
{ j~ds)dW%`&  
 BOOL bRemoved=FALSE; &53,8r  
 for(int index=0;index<MAX_KEY;index++){ FT6CKsM"  
  if(hCallWnd[index]==hWnd){ 9<3}zwJ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ IZ>l  
    hCallWnd[index]=NULL; Pb T2- F_  
    HotKey[index]=0; :'<;]~f  
    HotKeyMask[index]=0; "DvZCf[}  
    bRemoved=TRUE; [c1Gq)ht  
    KeyCount--; 4l*cX1!  
    break; :qj^RcmVPL  
   } nxuH22:  
  } fCY??su*   
 }  9Ca0Tu  
 return bRemoved; (fl$$$  
} *74/I>i  
S`b!sT-sD  
void VerifyWindow() 4,:I{P_>6B  
{ T'lycc4~a  
 for(int i=0;i<MAX_KEY;i++){ W(ryL_#;  
  if(hCallWnd!=NULL){ ;?iu@h  
   if(!IsWindow(hCallWnd)){ xa]yq%  
    hCallWnd=NULL; V73/q  
    HotKey=0; L{IMZ+IB2|  
    HotKeyMask=0; V+lS\E.  
    KeyCount--; vdUKIP =|_  
   } kUGFg{"  
  } -"H$ &p~  
 } 7uw-1F5x7  
} Z6Mjc/  
gx^!&>eIb#  
BOOL CHookApp::InitInstance() w]h8KNt  
{ &J9 + 5L8  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 32aI0CT  
 hins=AfxGetInstanceHandle(); Xe: ^<$z  
 InitHotkey(); !9r%d8!z  
 return CWinApp::InitInstance(); -:r<sv$  
} 0>-}c>  
t~ I;IB  
int CHookApp::ExitInstance() St!0MdCH  
{ K@[Hej6d  
 VerifyWindow(); T ?A3f]U  
 UnInit(); q4!\^HwQ  
 return CWinApp::ExitInstance(); vY.VFEP/  
} dJrUcZBr  
CflyK@  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 6Ktq7'Z@  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +{;wOQ.  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^%Y-~yB-  
#if _MSC_VER > 1000 ps`j>vX*  
#pragma once se>\5k  
#endif // _MSC_VER > 1000 pd,d"+  
/TB{|_HbW  
class CCaptureDlg : public CDialog ^A\(M%*F  
{ M(\{U"%@?  
 // Construction |XQ_4{  
 public: s}UJv\*  
  BOOL bTray; cotySio$  
  BOOL bRegistered; ppLLX1S  
  BOOL RegisterHotkey(); M?P\YAn$  
  UCHAR cKey; Br<lP#u=G  
  UCHAR cMask; :}#)ipr  
  void DeleteIcon(); 4DL2 A;T  
  void AddIcon(); /|&4&$  
  UINT nCount; >tMI%r  
  void SaveBmp(); K3=0D!Dq  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor BL>~~  
  // Dialog Data d+]=l+&  
  //{{AFX_DATA(CCaptureDlg) QH7 GEj]  
  enum { IDD = IDD_CAPTURE_DIALOG }; I} Q+{/?/  
  CComboBox m_Key; \AoqOC2u  
  BOOL m_bControl; )J+OyR=  
  BOOL m_bAlt; }#&[[}@th  
  BOOL m_bShift; 9qGba=}Ey  
  CString m_Path; :,$"Gk  
  CString m_Number; E^{!B]/oP  
  //}}AFX_DATA *+6iXMwe  
  // ClassWizard generated virtual function overrides (5:pHX`P  
  //{{AFX_VIRTUAL(CCaptureDlg) f9y+-GhaD  
 public: ='1hvv/  
  virtual BOOL PreTranslateMessage(MSG* pMsg); j bT{K|d-  
 protected: 6v%ePFul  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]^wr+9zd  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); If&y 5C  
  //}}AFX_VIRTUAL x2HISxg  
  // Implementation PMbq5  
 protected: %Q}(.h%M  
  HICON m_hIcon; n?D/bXp  
  // Generated message map functions ?5};ONjN  
  //{{AFX_MSG(CCaptureDlg) #J5_z#-Q;  
  virtual BOOL OnInitDialog(); KMqGWO*  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !vK0|eV3  
  afx_msg void OnPaint(); >6WZSw/Hq  
  afx_msg HCURSOR OnQueryDragIcon(); ?D9iCP~~  
  virtual void OnCancel(); hG<[F@d  
  afx_msg void OnAbout(); p0CPeH  
  afx_msg void OnBrowse(); '+iLW~   
  afx_msg void OnChange(); (IjM  
 //}}AFX_MSG km^ZF<.@  
 DECLARE_MESSAGE_MAP() <ycR/X  
}; o F_{oV '  
#endif Y1ca=ewFx  
d9jD?HgM(  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file sy4Nm0m  
#include "stdafx.h" ld({1jpX,  
#include "Capture.h" !OPHS^L  
#include "CaptureDlg.h" %yfl-c(u  
#include <windowsx.h> b *0uxvLu  
#pragma comment(lib,"hook.lib") #< :`:@2  
#ifdef _DEBUG >X:!Y[N  
#define new DEBUG_NEW K]yWpW  
#undef THIS_FILE ",Mrdxn7  
static char THIS_FILE[] = __FILE__; rp1+K4]P  
#endif >X iT[Ru  
#define IDM_SHELL WM_USER+1 2w+4B4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s?9Y3]&+&M  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #k>A,  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; L>7@!/ 9L  
class CAboutDlg : public CDialog }1Mf0S  
{ d, ?GW  
 public: # SJJ@SM  
  CAboutDlg(); %`lJAW[  
  // Dialog Data b"trg {e  
  //{{AFX_DATA(CAboutDlg) &{qKoI]  
  enum { IDD = IDD_ABOUTBOX }; >RJ&b  
  //}}AFX_DATA rADzJ#CU \  
  // ClassWizard generated virtual function overrides KC(z TY  
  //{{AFX_VIRTUAL(CAboutDlg) .EjR<UU  
 protected: (@^ySiU  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support H;tE=  
  //}}AFX_VIRTUAL \K%M.>]vq  
  // Implementation 1L7^g*  
 protected: y[AB,Dd  
  //{{AFX_MSG(CAboutDlg) uD{ xs  
  //}}AFX_MSG s0x/2z  
  DECLARE_MESSAGE_MAP() =h ~n5wQG  
}; bd27])n(  
1Q9Hs(s  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) JqYa~6 C  
{ >YF=6zq.`  
 //{{AFX_DATA_INIT(CAboutDlg) 8uW%jG3/  
 //}}AFX_DATA_INIT W*(- * \1[  
} 9OY ao  
SwO$UqYU=  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) CS-jDok  
{ Ar?ZUASJ  
 CDialog::DoDataExchange(pDX); SlT>S1`rnG  
 //{{AFX_DATA_MAP(CAboutDlg) cQBc6eAi  
 //}}AFX_DATA_MAP #QSSpsF@  
} Sx0{]1J  
@k'V`ZQF  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^f"|<r  
 //{{AFX_MSG_MAP(CAboutDlg) kG}F/GN?  
 // No message handlers `2x.-  
 //}}AFX_MSG_MAP ^rjUye%EK  
END_MESSAGE_MAP() 7ju38@+  
jk\V2x@DR  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Y"s8j=1m  
: CDialog(CCaptureDlg::IDD, pParent) Pq(LW(  
{ cyabqx  
 //{{AFX_DATA_INIT(CCaptureDlg) i`vy<Dvpz  
  m_bControl = FALSE; 4UzXTsjM7  
  m_bAlt = FALSE; E:A!tu$B  
  m_bShift = FALSE; N{@~(>ee^  
  m_Path = _T("c:\\"); B/n~ $  
  m_Number = _T("0 picture captured."); e0Gs|c+6  
  nCount=0; oZl%0Uy?9I  
  bRegistered=FALSE; 15aPoxo>  
  bTray=FALSE; 7kT X  
 //}}AFX_DATA_INIT tuuwoiQ*`  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Gui[/iY,F  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); uf (_<~  
} hJk:&!M=T  
q0vZR"y  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) KQw>6)  
{ S0r+Y0J]<  
 CDialog::DoDataExchange(pDX); g:G5'pZf  
 //{{AFX_DATA_MAP(CCaptureDlg) +bJ~S:[  
  DDX_Control(pDX, IDC_KEY, m_Key); #,XZ@u+  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); a{rUk%x  
  DDX_Check(pDX, IDC_ALT, m_bAlt); J}#2Wy^{  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); W5:fY>7  
  DDX_Text(pDX, IDC_PATH, m_Path); ,7k1n{C)  
  DDX_Text(pDX, IDC_NUMBER, m_Number); l]&x~K}  
 //}}AFX_DATA_MAP &o1k_!25  
} '#,C5*`  
bs16G3- p  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 'Yc^9;C(  
//{{AFX_MSG_MAP(CCaptureDlg) hH%fWB2(  
 ON_WM_SYSCOMMAND() p1 HbD`ST  
 ON_WM_PAINT() hJir_=  
 ON_WM_QUERYDRAGICON() ssoE,6kS  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) oK4xRv8Hd  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ^}wF^ _  
 ON_BN_CLICKED(ID_CHANGE, OnChange) NZ6:Zz M  
//}}AFX_MSG_MAP sdyNJh7Jr  
END_MESSAGE_MAP() dZb;`DjTH  
5dD8s-;^T  
BOOL CCaptureDlg::OnInitDialog() /<(-lbq,  
{ KHJ wCv  
 CDialog::OnInitDialog(); C=cn .CX  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ]?oJxW.  
 ASSERT(IDM_ABOUTBOX < 0xF000); e-\/1N84  
 CMenu* pSysMenu = GetSystemMenu(FALSE); A^LS^!Jz  
 if (pSysMenu != NULL) 5IFzbL#q#f  
 { +/]*ChrS  
  CString strAboutMenu; }#g+~9UK  
  strAboutMenu.LoadString(IDS_ABOUTBOX); X-TGrdoX  
  if (!strAboutMenu.IsEmpty()) +o"CMI  
  { R(cg`8  
   pSysMenu->AppendMenu(MF_SEPARATOR); .c__T {<)[  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); d\JB jT1g  
  } Ld/6{w4ir  
 } imAOYEH7}  
 SetIcon(m_hIcon, TRUE); // Set big icon &}pF6eIar  
 SetIcon(m_hIcon, FALSE); // Set small icon 0G33hIOS  
 m_Key.SetCurSel(0); Cx.##n0  
 RegisterHotkey(); ^=1u2YdVw  
 CMenu* pMenu=GetSystemMenu(FALSE); LEOa=(mN\  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 'RzO`-dr  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); cx&\oP  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); kp}[nehF  
 return TRUE; // return TRUE unless you set the focus to a control p|dn&<kd  
} H=g%>W%3  
#Er"i  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) x#zj0vI-8  
{ eO*s,*  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 6%>'n?  
 { .9,x_\|G*  
  CAboutDlg dlgAbout; T{"Ur :p  
  dlgAbout.DoModal(); [^6z>  
 } vNl)ltzJF  
 else a l6y=;\jZ  
 { Q4a7g$^  
  CDialog::OnSysCommand(nID, lParam); m.! M#x2!  
 } / #rH18  
} _<Ij)#Rq7  
g`fMHU7  
void CCaptureDlg::OnPaint() z9g6%RbwX  
{ *FZav2]-  
 if (IsIconic()) 7DoU7I\u  
 { 2/uZ2N |S  
  CPaintDC dc(this); // device context for painting 3;> z %{  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ~1twGG_;  
  // Center icon in client rectangle ' ]+!i a  
  int cxIcon = GetSystemMetrics(SM_CXICON); ZX1/6|_  
  int cyIcon = GetSystemMetrics(SM_CYICON); z/f._Z(  
  CRect rect; jX(${j<  
  GetClientRect(&rect); x|dP-E41\  
  int x = (rect.Width() - cxIcon + 1) / 2; F'|e:h  
  int y = (rect.Height() - cyIcon + 1) / 2; bM:4i1Z  
  // Draw the icon ^,AE;Z T7  
  dc.DrawIcon(x, y, m_hIcon); KF1iYo>p  
 } L%Rw]=v}v  
 else z>,M@@  
 { h$6'9rL&i  
  CDialog::OnPaint(); Kl%[fjI)  
 } \ERxr   
} *i:8g(  
z 5(5\j]  
HCURSOR CCaptureDlg::OnQueryDragIcon() <2&qIvHL  
{ Tj_K5uccU}  
 return (HCURSOR) m_hIcon; O2p E"8=4Q  
} L8f+uI   
X';qcn_^  
void CCaptureDlg::OnCancel() Us'JMZ~  
{ 3Wbd=^hRvq  
 if(bTray) U:n~S  
  DeleteIcon(); e7{6<[k3+$  
  CDialog::OnCancel(); f'(F'TE  
} qCfEv4  
r"h09suZBW  
void CCaptureDlg::OnAbout() :f39)g5>  
{ L FJ@4]%V  
 CAboutDlg dlg; F9K`N8wlu  
 dlg.DoModal(); Y,Z$U| U  
} stUv!   
hLgX0QV  
void CCaptureDlg::OnBrowse() m?B=?;B9#  
{ Fs $FR-x  
 CString str; |gP)lR  
 BROWSEINFO bi; *P/A&"i[E  
 char name[MAX_PATH]; l9=Ka{$^*  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ;w"h n*  
 bi.hwndOwner=GetSafeHwnd(); bO/r1W  
 bi.pszDisplayName=name; #t(/wa4  
 bi.lpszTitle="Select folder"; { >[ ]iX  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; V61oK  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); .[]S!@+%  
 if(idl==NULL) P[q>;Fx*  
  return; %#v$d  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 6wwbH}*=?  
 str.ReleaseBuffer(); NcF>}f,}\  
 m_Path=str; $3>Rw/,  
 if(str.GetAt(str.GetLength()-1)!='\\') %po;ih$jr*  
  m_Path+="\\"; nKr'cb  
 UpdateData(FALSE); .u#Hg'oP  
} ; I-6H5  
T5ky:{Y(  
void CCaptureDlg::SaveBmp() R$ +RTG:E  
{ ojf6@p_  
 CDC dc; <5pNFj}0;X  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); >W-xDzJry  
 CBitmap bm; 3I( n];  
 int Width=GetSystemMetrics(SM_CXSCREEN); EHn!ZrQgh  
 int Height=GetSystemMetrics(SM_CYSCREEN); :6t73\O  
 bm.CreateCompatibleBitmap(&dc,Width,Height); h;+O96V4.  
 CDC tdc; > TCit1yD  
 tdc.CreateCompatibleDC(&dc); G`0{31us  
 CBitmap*pOld=tdc.SelectObject(&bm); rCA!b"C2  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); UsU Ri  
 tdc.SelectObject(pOld); !w%c= V]tV  
 BITMAP btm; 8gE p5  
 bm.GetBitmap(&btm); .txtt?ZF2  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 6IT6EkiT  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Kn5C  
 BITMAPINFOHEADER bih; y|MhV/P04  
 bih.biBitCount=btm.bmBitsPixel; VpHwc!APq  
 bih.biClrImportant=0; DGCvH)Q  
 bih.biClrUsed=0; ((`{-y\K  
 bih.biCompression=0; >\pF5a`  
 bih.biHeight=btm.bmHeight; %u&Vt"6m=  
 bih.biPlanes=1; tyW[i8)O}  
 bih.biSize=sizeof(BITMAPINFOHEADER); i_AD3Jrs  
 bih.biSizeImage=size; ]] 0M  
 bih.biWidth=btm.bmWidth; 86-Rm  
 bih.biXPelsPerMeter=0; ?r&~(<^z  
 bih.biYPelsPerMeter=0; r5hkxk'  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); DeF`#a0E  
 static int filecount=0; Mpw]dYM  
 CString name; WK*tXc_[b  
 name.Format("pict%04d.bmp",filecount++); lN5PKsGl  
 name=m_Path+name; leNX5 sX  
 BITMAPFILEHEADER bfh; 0Q7<;'m  
 bfh.bfReserved1=bfh.bfReserved2=0; }[PwA[k'  
 bfh.bfType=((WORD)('M'<< 8)|'B'); [3-u7Fx!  
 bfh.bfSize=54+size; .Er+*j;&w  
 bfh.bfOffBits=54; 1/:vFX  
 CFile bf; 6-"tQ,AZ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ diM*jN#  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); s-WZ3g  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); jJ<&!=  
  bf.WriteHuge(lpData,size); '\8YH+%It  
  bf.Close(); [Ca''JqrA  
  nCount++; I$+=Fb'N0  
 } O ] !tK  
 GlobalFreePtr(lpData); PV"\9OIKb.  
 if(nCount==1) iN'T^+um=  
  m_Number.Format("%d picture captured.",nCount); NkBvN\CQ  
 else iExKi1knx  
  m_Number.Format("%d pictures captured.",nCount); dba_(I~y  
  UpdateData(FALSE); MYara;k  
} `{Oqb  
Wq}6RdY$ZA  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -wC}JVVcK  
{ w ]T_%mdk  
 if(pMsg -> message == WM_KEYDOWN) _)Txg2?=  
 { <$A/ ('  
  if(pMsg -> wParam == VK_ESCAPE) {N{eOa<HA  
   return TRUE; 0H +nVR  
  if(pMsg -> wParam == VK_RETURN) Rh"O$K~  
   return TRUE; _$IWr)8f  
 } zB+e;x f|  
 return CDialog::PreTranslateMessage(pMsg); C,> n  
} 8 NNh8k#6  
D}!YF~  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) D Q={  
{ pwHe&7e#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 4>L* 7i  
  SaveBmp(); #M w70@6  
  return FALSE; r]\[G6mE%  
} JiXE{(  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ P6>C+T1  
 CMenu pop; qlPIxd  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); cL4Go,)w  
 CMenu*pMenu=pop.GetSubMenu(0); S m=ln)G=  
 pMenu->SetDefaultItem(ID_EXITICON); \^y~w~g?  
 CPoint pt; AG vhSd7  
 GetCursorPos(&pt); vYXhWqL~  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); t d\gk  
 if(id==ID_EXITICON) 8lqmd1v  
  DeleteIcon(); W!XBuk-  
 else if(id==ID_EXIT) QwFA0  
  OnCancel(); ip'{@1L  
 return FALSE; Kg<~Uf=1  
} R7z @y o  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); N6_1iIM  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) SFuSM/Pf  
 AddIcon(); Ei]Sks V>*  
 return res; bg0ix"  
} Xqm ?@JN  
rBL2A  
void CCaptureDlg::AddIcon() kP('X/  
{ M+ <SSi"  
 NOTIFYICONDATA data; ^5~x*=_  
 data.cbSize=sizeof(NOTIFYICONDATA); FYC]^D  
 CString tip; E3S0u7 Es  
 tip.LoadString(IDS_ICONTIP); 0)K~pV0aT  
 data.hIcon=GetIcon(0); n?OMfx  
 data.hWnd=GetSafeHwnd(); *HV_$^)=  
 strcpy(data.szTip,tip); TK'y-5W  
 data.uCallbackMessage=IDM_SHELL; IpzU=+h  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; m$_l{|4z  
 data.uID=98; *tpS6{4=#7  
 Shell_NotifyIcon(NIM_ADD,&data); A 9l d9R  
 ShowWindow(SW_HIDE); _hJ+8B^`  
 bTray=TRUE; aG =6(ec.  
} "Zn nb*pOM  
h|'|n/F  
void CCaptureDlg::DeleteIcon() _M7|:*  
{ ' cS| BT  
 NOTIFYICONDATA data; X5+^b({  
 data.cbSize=sizeof(NOTIFYICONDATA); A\7sP =  
 data.hWnd=GetSafeHwnd(); IR2Qc6+{  
 data.uID=98; CcV@YST?  
 Shell_NotifyIcon(NIM_DELETE,&data); #!TlalV  
 ShowWindow(SW_SHOW); h 1 "#  
 SetForegroundWindow(); oIj/V|ByK  
 ShowWindow(SW_SHOWNORMAL); >^#Liwm  
 bTray=FALSE; YT[=o}jS  
} ft{i6}  
oTb42a_j{  
void CCaptureDlg::OnChange() _N|A I"sj.  
{ l>i:M#z&  
 RegisterHotkey(); 8?<J,zu@AV  
} O<>+l*bk  
.pl,ujv  
BOOL CCaptureDlg::RegisterHotkey() @*6_Rp"@  
{ o^d|/;  
 UpdateData(); }NV<k  
 UCHAR mask=0; gV:0&g\v  
 UCHAR key=0; x=W s)&H_Y  
 if(m_bControl) "[z/\l8O  
  mask|=4; Q-G8Fo%#,E  
 if(m_bAlt) ~tW<]l7  
  mask|=2; 3_ E}XQd  
 if(m_bShift) Z5wQhhH  
  mask|=1; ~pI`_3  
  key=Key_Table[m_Key.GetCurSel()]; wLO"[,  
 if(bRegistered){ zh?B-"O=5  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); -g 9CW[  
  bRegistered=FALSE; qOyS8tA.H  
 }  ++8 Xi1  
 cMask=mask; r}|)oG,=  
 cKey=key; 'f %oL/,  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ^pfM/LQ@  
 return bRegistered; 8"ZcKxDk  
} v{1g`E  
4>Q] \\Lc  
  四、小结 jt3W.^6HO  
Bv*VNfUm  
  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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