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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: w?^[*_Y  
  %N&W_.F6  
  一、实现方法 ?wCX:? g  
F ]Zg  
  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: 6 R})KIG  
U`HY eJ  
#pragma data_seg("shareddata") |9IOZ>H9  
HHOOK hHook =NULL; //钩子句柄 l&e$:=;8  
UINT nHookCount =0; //挂接的程序数目 3oH/34jj  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 9&.md,U'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 C4.GtY8,d  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey K%mR=u#%&  
static int KeyCount =0; OY:rcGc`t  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -l[$+Kw1S  
#pragma data_seg() xS5 -m6/  
]4 c+{  
  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。 .74C~{}$  
xP&7i'ag  
  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: 0H^*VUyW/  
Q1x&Zm1v  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Lw_|o[I}  
cKey,UCHAR cMask) " M?dU^U^  
{ .Wy'  
 BOOL bAdded=FALSE; PuGs%{$(h  
 for(int index=0;index<MAX_KEY;index++){ f+n {9Hz  
  if(hCallWnd[index]==0){ H)gc"aRe;Y  
   hCallWnd[index]=hWnd; E?P>s T3B  
   HotKey[index]=cKey; "G.X=, V  
   HotKeyMask[index]=cMask; 3Wv^{|^  
   bAdded=TRUE; Cb+$|Kg/"b  
   KeyCount++; .udLMS/_  
   break; !bYVLFp=\_  
  } Ry]9n.y  
 } g0U?`;n$  
 return bAdded; R2-F@_  
} 3 e1-w$z&S  
//删除热键 {j]cL !Od  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 43M.Hj]  
{ bo\Ah/.  
 BOOL bRemoved=FALSE; Q*PcO\Y!y  
 for(int index=0;index<MAX_KEY;index++){ w?|qKO  
  if(hCallWnd[index]==hWnd){ ; YQB  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ SE^l`.U@  
    hCallWnd[index]=NULL; :?g+\:`/0j  
    HotKey[index]=0; d4\JM 65  
    HotKeyMask[index]=0; };9s8VZE  
    bRemoved=TRUE; , h'Q  
    KeyCount--; iCg%$h  
    break; e"eIQI|N  
   } E7? n'!=  
  } j<0 ;JAL  
 } 'r%(,=L  
 return bRemoved; ux(~+<k  
} `pZX!6Wn  
rM A%By^L-  
C`kqsK   
  DLL中的钩子函数如下: GU2TQx{V  
MQN~I^v3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |/n7(!7$[v  
{ ^tG,H@95  
 BOOL bProcessed=FALSE; \X %FM"r  
 if(HC_ACTION==nCode) ``VE<:2+  
 { YARL/V  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 t^YtP3`?b  
   switch(wParam) X5 or5v  
   {  ~i?A!  
    case VK_MENU: xi "3NF%=  
     MaskBits&=~ALTBIT; z|%Pi J ,  
     break; 0LL0\ly]  
    case VK_CONTROL: dEKu5GI  
     MaskBits&=~CTRLBIT; ~B"HI+:\L  
     break; &DGz/o  
    case VK_SHIFT: }k%6X@  
     MaskBits&=~SHIFTBIT; <Y?Z&rNb  
     break; IBJNs$  
    default: //judge the key and send message 2xO[ ?fR  
     break; DH+kp$,}  
   } r.zgLZ}3&V  
   for(int index=0;index<MAX_KEY;index++){ }Cw,m0KV/  
    if(hCallWnd[index]==NULL) # M/n\em"X  
     continue; Wd)\r.pJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $Uy+]9  
    { hZ e{Ri  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5yoi;$~}_0  
     bProcessed=TRUE; 'ZMh<M[  
    } f7Nmvla[q  
   } Ul]7IUzsu  
  } e8xq`:4Y  
  else if((lParam&0xc000ffff)==1){ //有键按下 <%uEWb)  
   switch(wParam) ?VE'!DW  
   { o(Z~J}l({  
    case VK_MENU:  AkS16A  
     MaskBits|=ALTBIT; b:Zh|-  
     break; O]=jI  
    case VK_CONTROL: 1aRTvaGo  
     MaskBits|=CTRLBIT; bs)wxU`Q*  
     break; \l /}` w  
    case VK_SHIFT: -sJD:G,%  
     MaskBits|=SHIFTBIT; q&v~9~^}d  
     break; !10/M  
    default: //judge the key and send message 8o%Vn'^t  
     break; {X(nn.GpC  
   } @#,/6s7?  
   for(int index=0;index<MAX_KEY;index++){ FD 8Lk  
    if(hCallWnd[index]==NULL) 1[Yl8W%pj  
     continue; W)Y`8&,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ANw1P{9*  
    { Q2m[XcnX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); u]Vt>Ywu  
     bProcessed=TRUE; ~210O5^  
    } L$OZ]  
   } ^\O*e)#*  
  } _^GBfM.  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 MjC<N[WO>N  
   for(int index=0;index<MAX_KEY;index++){ |U{~t<BF#  
    if(hCallWnd[index]==NULL) _yN5sLLyb  
     continue; $aJay]F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ZXYyG`3+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); T=42]h  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 SQf[1}$ .  
   } !vu-`u~86  
  } Kj @<$ChZw  
 } #`|Nm3b  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); V9"R8*@-  
} ig.Z,R3@r  
_%2ukuJ `  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: &57~i=A 3  
R)Mkt8v  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); O[MFp  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); RNB&!NC  
X(BxC<!D.  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: nN<,rN{ :  
IWq\M,P  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =h-E N_[  
{ \D z? h  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) !% W5@tN  
 { F6yFKNK!n  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 K(u pz n*a  
  SaveBmp(); us|Hb  
  return FALSE; 1DcBF@3sWG  
 } >^g2 Tg:  
 …… //其它处理及默认处理 QEt"T7a[/  
} A8mc+ Bf(  
J  Y8Rk=  
-d4 v:Jab  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 7 SJ=2  
u,8)M' UU  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 klQmo30i  
nn:'<6"oV  
  二、编程步骤 dX1jn;7  
SceHdx(]  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; +?"F=.SZ  
KQ]sUNH  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Ir>4-@  
s;oe Qa}TB  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; hv#$Zo<  
fWEQ vQ  
  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; ^ fC2o%3^  
zKJQel5  
  5、 添加代码,编译运行程序。 \w1XOm [)  
`x _(EZ  
三、程序代码 Psx"[2iZm  
N(4y}-w$  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL }gX hN"  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) L{jx'[C  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ wMCg`rk  
#if _MSC_VER > 1000 &\6},JN  
#pragma once aeN #<M&$<  
#endif // _MSC_VER > 1000 9Xg7=(#  
#ifndef __AFXWIN_H__ ]}b  
#error include 'stdafx.h' before including this file for PCH tTTHQ7o*BD  
#endif "0PsCr}!  
#include "resource.h" // main symbols {u y^Bui}  
class CHookApp : public CWinApp dcmf~+T  
{ =6ru%.8U,  
 public: 7$%G3Q|)L  
  CHookApp(); $dI mA  
  // Overrides em,1Yn?  
  // ClassWizard generated virtual function overrides d*Mqs}8  
  //{{AFX_VIRTUAL(CHookApp) fNAW4I I}  
 public: iQ Xlz] '  
  virtual BOOL InitInstance(); Yn [ F:Z  
  virtual int ExitInstance(); *)w+xWmM3w  
  //}}AFX_VIRTUAL %Jh( 5  
  //{{AFX_MSG(CHookApp) 9VTAs:0D=  
  // NOTE - the ClassWizard will add and remove member functions here. EQ^]W-gN  
  // DO NOT EDIT what you see in these blocks of generated code ! R$l- 7YSt  
  //}}AFX_MSG bFN/{^SB  
  DECLARE_MESSAGE_MAP() !YGHJwW:  
}; N5zWeFq@6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); )N- '~<N  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 64U|]g d$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !?ZR_=Y%  
BOOL InitHotkey(); FD E?O]^  
BOOL UnInit(); >i  
#endif ^(+q 1O'  
cOdRb=?9  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. rAHP5dx:  
#include "stdafx.h" 9jf9 u0  
#include "hook.h" p : z ][I  
#include <windowsx.h> o>(<:^x9  
#ifdef _DEBUG EmO[-W|2  
#define new DEBUG_NEW =TEe:%mN  
#undef THIS_FILE *V:U\G  
static char THIS_FILE[] = __FILE__; 3t+{~{Dj  
#endif "Ua-7Q&A  
#define MAX_KEY 100 KxKZC }4m  
#define CTRLBIT 0x04 j~\FDcG*ed  
#define ALTBIT 0x02 L`<#vi  
#define SHIFTBIT 0x01 ?/MkH0[G=  
#pragma data_seg("shareddata") ?,riwDI 2  
HHOOK hHook =NULL; Ww8U{f  
UINT nHookCount =0; #FAW@6QG  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey wxK71OH  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT zP0<4E$M`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey T2]8w1l&K  
static int KeyCount =0; a"xRc  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift *jc >?)k  
#pragma data_seg() ,2Ed^!`  
HINSTANCE hins; ZG H 7_K  
void VerifyWindow(); FLQke"6i0:  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ~.^:?yCA  
//{{AFX_MSG_MAP(CHookApp) m=E/um[D  
// NOTE - the ClassWizard will add and remove mapping macros here. :kI[Pf!z  
// DO NOT EDIT what you see in these blocks of generated code! vgtAJp+p*  
//}}AFX_MSG_MAP ;sYDs71y  
END_MESSAGE_MAP() AaB1H7r-  
ul N1z  
CHookApp::CHookApp() 1t/c@YUTy  
{ xzY/$?  
 // TODO: add construction code here,  y_[VhZ%  
 // Place all significant initialization in InitInstance $~:ZzZO  
} cu5}(  
(T2HUmkQ6  
CHookApp theApp; '=+N )O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :,p3&2 I  
{ P]}:E+E<.I  
 BOOL bProcessed=FALSE; 11QZ- ^  
 if(HC_ACTION==nCode) j^b &Q  
 { {}'Jr1  
  if((lParam&0xc0000000)==0xc0000000){// Key up YY tVp_)  
   switch(wParam) r%=a:GdAg  
   { AFsieJ  
    case VK_MENU: rusM]Z  
     MaskBits&=~ALTBIT; E%E`\mFD  
     break; "&D0Sd@[?  
    case VK_CONTROL: %2D'NZS  
     MaskBits&=~CTRLBIT; ts[8;<YD  
     break; -6_<]  
    case VK_SHIFT: n)a/pO_  
     MaskBits&=~SHIFTBIT; +fozE?  
     break; Yy/,I]F  
    default: //judge the key and send message ;9)nG,P3  
     break; fuHNsrNlm  
   } <w~$S0_  
   for(int index=0;index<MAX_KEY;index++){  7Tr '<(A  
    if(hCallWnd[index]==NULL) V+>RF  
     continue; Vo{ ~D:)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) jl 7>  
    { /-lW$.+{?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); hA/Es?U]  
     bProcessed=TRUE; +7WpJ;C4  
    } p[WlcbBwT  
   } ~yXDN4s  
  } X0ugnQ6  
  else if((lParam&0xc000ffff)==1){ //Key down S]fkA6v  
   switch(wParam) }3Ke  
   { ~IO'"h'w  
    case VK_MENU: U%1M?vT/  
     MaskBits|=ALTBIT; $ta"Ug.z  
     break; q2B'R   
    case VK_CONTROL: w H=7pS"s  
     MaskBits|=CTRLBIT; b?Q$UMAbH  
     break; h Ks  
    case VK_SHIFT: Wn;%B].I  
     MaskBits|=SHIFTBIT; `_neYT  
     break; G~&q  
    default: //judge the key and send message v%`k*n':  
     break; 8KR17i1  
   } 7Y.yl F:  
   for(int index=0;index<MAX_KEY;index++) g] IPNW^n  
   { =Ldf#8J  
    if(hCallWnd[index]==NULL) p|0SA=?k"  
     continue; >3p8o@:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0.!vp?  
    {  874j9ky[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); j";L{  
     bProcessed=TRUE; e5FF'~A%]  
    } uW}M1kq?+l  
   } ):=8w.yC  
  } fK@UlMC]7  
  if(!bProcessed){ 2WKIO|'  
   for(int index=0;index<MAX_KEY;index++){ Ygfy;G%  
    if(hCallWnd[index]==NULL) OL#i!ia.  
     continue; Q-s5-&h(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5A %TpJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); k+@ :+ RL  
   } g:c?%J  
  } S>HfyZ&Pc  
 } }{J>kgr6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); fWg 3gRI  
} 5``usn/&Kj  
vsA/iH.  
BOOL InitHotkey() 5D^2 +`$/  
{ d"ZsOq10D  
 if(hHook!=NULL){ 4ee-tKH  
  nHookCount++; 0Iyb}  
  return TRUE; '|tmmoY6a:  
 } <[gN4x>'  
 else 8&x&Ou$("V  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); /^~)iTwH  
  if(hHook!=NULL) - t 4F  
   nHookCount++; \dB z-H'@  
  return (hHook!=NULL); ij_5=4aZ-  
} ,*L3  
BOOL UnInit() b83m'`vRM  
{ 9j;!4AJ1t  
 if(nHookCount>1){ 4 ;6,h6a  
  nHookCount--; &ML-\aSal  
  return TRUE; vvG*DGL)qL  
 } Kx;la  
 BOOL unhooked = UnhookWindowsHookEx(hHook); SrMfd7H8f  
 if(unhooked==TRUE){ #; P-*P  
  nHookCount=0; L`w_Q2{sv  
  hHook=NULL; [4])\q^q  
 } HR'F  
 return unhooked; PGTjOkx  
} bI;u};v  
=':SOO7  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) oC!z+<  
{ wUS w 9xg  
 BOOL bAdded=FALSE; ncR]@8  
 for(int index=0;index<MAX_KEY;index++){ Q`=d5Uvw  
  if(hCallWnd[index]==0){ ?|hYtV  
   hCallWnd[index]=hWnd; [].euDrX  
   HotKey[index]=cKey; RbA.&=3  
   HotKeyMask[index]=cMask; 8X\":l:  
   bAdded=TRUE; 0w2<2grQ  
   KeyCount++; H7{kl  
   break; )5diX + k  
  } IS{>(XT{  
 } *MCkezW7{  
 return bAdded;  </Dv?  
} kf' 4C "}  
0}>p)k3&A  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2tp95E`(O  
{ *2m{i:3  
 BOOL bRemoved=FALSE; #("E) P  
 for(int index=0;index<MAX_KEY;index++){ wX@g >(  
  if(hCallWnd[index]==hWnd){ ~P-^An^  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8hX /~-H  
    hCallWnd[index]=NULL; SmP&wNHQf  
    HotKey[index]=0; @Rqn&tA8  
    HotKeyMask[index]=0; =#I/x=L:  
    bRemoved=TRUE; KW36nY\7  
    KeyCount--; :{#w-oC>6P  
    break; a0wpsl iF  
   } vWYU'_=  
  } ^{O1+7d[.  
 } _6sSS\  
 return bRemoved; FbD9G6h5  
} lxLEYDGFS  
R{Me~L?  
void VerifyWindow() ML1/1GK*i+  
{ <)oW  
 for(int i=0;i<MAX_KEY;i++){ m8* )@e  
  if(hCallWnd!=NULL){ N<HJ}geC "  
   if(!IsWindow(hCallWnd)){ Pfg.'Bl  
    hCallWnd=NULL; n 8)eC2 A  
    HotKey=0; )3!z2f:e  
    HotKeyMask=0; Z~g7^,-t  
    KeyCount--; a7fn{VU8  
   } _$gP-J  
  } S1*xM  
 } @$|bMH*1:  
} kK]L(ZU +  
M+M\3U  
BOOL CHookApp::InitInstance() F*,RDM'M  
{ sH{(=N  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); /onZ14  
 hins=AfxGetInstanceHandle(); mv`ND&  
 InitHotkey(); /Nd`eUn  
 return CWinApp::InitInstance(); ShU1RQk  
} 5k<0>6;XH  
pJ@D}2u(  
int CHookApp::ExitInstance() '!XVz$C  
{ oMb@)7  
 VerifyWindow(); YGCBDH%6  
 UnInit(); rn-CQ2{?  
 return CWinApp::ExitInstance(); 5oY^; )\/  
} K!|J/W  
=D^R,Q  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file J+Zp<Wu-  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) z7O$o/E-*  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ s>e)\9c  
#if _MSC_VER > 1000 m+dJ3   
#pragma once 9.l*#A^  
#endif // _MSC_VER > 1000 [Pz['q L3t  
+)e+$ l  
class CCaptureDlg : public CDialog |il P>b  
{ FWQNO(  
 // Construction `z6I][Uf  
 public: bb`8YF+?'  
  BOOL bTray; a~Y`N73/c  
  BOOL bRegistered; <3[0A;W=1  
  BOOL RegisterHotkey(); lemUUl(^  
  UCHAR cKey; YyD0g9{  
  UCHAR cMask; QWAtF@qTV  
  void DeleteIcon();  s{T6qJ  
  void AddIcon(); SH1)@K-  
  UINT nCount; Gx h1wqLR  
  void SaveBmp(); CdNb&Nyz  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor e6I7N?j  
  // Dialog Data !TPKD  
  //{{AFX_DATA(CCaptureDlg) ee .,D  
  enum { IDD = IDD_CAPTURE_DIALOG }; !,cfA';S  
  CComboBox m_Key; ?%i~~hfH#N  
  BOOL m_bControl; 1C<@QrT  
  BOOL m_bAlt; '"]U+aIg  
  BOOL m_bShift; (Ujry =f  
  CString m_Path; uwWKsZ4:ij  
  CString m_Number; Amj'$G|+hj  
  //}}AFX_DATA / yTPb  
  // ClassWizard generated virtual function overrides KWi P`h8  
  //{{AFX_VIRTUAL(CCaptureDlg) G Y+li {  
 public: {1J4Q[N9m  
  virtual BOOL PreTranslateMessage(MSG* pMsg); #b$qtp!,  
 protected: 5/m}v'S%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $VUX?ii$7=  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); %.  W56  
  //}}AFX_VIRTUAL +Z=DvKsTJ  
  // Implementation yuq2)  
 protected: )PjU=@$lI  
  HICON m_hIcon; nm]m!.$d  
  // Generated message map functions Isg\ fSK<j  
  //{{AFX_MSG(CCaptureDlg)  ]YKxJ''u  
  virtual BOOL OnInitDialog(); FZ=xy[q]~  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); =nE^zY2m%  
  afx_msg void OnPaint(); kuW^_BROJ  
  afx_msg HCURSOR OnQueryDragIcon(); IOOK[g.?h  
  virtual void OnCancel(); r5'bt"K\>  
  afx_msg void OnAbout(); ! +XreCw  
  afx_msg void OnBrowse(); ~r?VXO p"  
  afx_msg void OnChange(); }5lC8{wZ  
 //}}AFX_MSG p?'&P!  
 DECLARE_MESSAGE_MAP() x5eSPF1  
}; -$cO0RSY  
#endif 5O"$'iL  
w7QYWf'  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file o&#!W(   
#include "stdafx.h" E{{Kz r2$  
#include "Capture.h" i@#=Rxp  
#include "CaptureDlg.h" }sW%i#CV  
#include <windowsx.h> ibh,d.*~g  
#pragma comment(lib,"hook.lib") ]Yk)A.y  
#ifdef _DEBUG jAy 0k  
#define new DEBUG_NEW X v$"B-j  
#undef THIS_FILE cng166}1A  
static char THIS_FILE[] = __FILE__; z2[{3Kd*  
#endif V3q [ $~9  
#define IDM_SHELL WM_USER+1 1}3tpO;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `{9bf)vP6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |Jny0a/0  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; YU/?AQg  
class CAboutDlg : public CDialog nG0R1<  
{ (0^ZZe`# j  
 public: )w,<XJhg`  
  CAboutDlg(); p;.M .  
  // Dialog Data 0n*D](/NK  
  //{{AFX_DATA(CAboutDlg) lwm 9gka  
  enum { IDD = IDD_ABOUTBOX }; )F,z pGG  
  //}}AFX_DATA %`}nP3  
  // ClassWizard generated virtual function overrides @IV,sz e  
  //{{AFX_VIRTUAL(CAboutDlg) qpV"ii  
 protected: LyRW\\z2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support I*H($ a  
  //}}AFX_VIRTUAL QVo>Uit   
  // Implementation 3a}53? $  
 protected: CI^s~M >  
  //{{AFX_MSG(CAboutDlg) >Et~h65d5  
  //}}AFX_MSG LpN3cy>U  
  DECLARE_MESSAGE_MAP() h}4yz96WD  
}; 1C(sBU"  
+P%k@w#<Z  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) !TO+[g!  
{ z[' 2  
 //{{AFX_DATA_INIT(CAboutDlg) ~,.'#=V  
 //}}AFX_DATA_INIT rG3?Z^&R+  
} moL3GV%]Gq  
pKaU [1x?%  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) y+nX(@~f]  
{ r*9*xZ>8u  
 CDialog::DoDataExchange(pDX); 2=uwGIF  
 //{{AFX_DATA_MAP(CAboutDlg) 0G`@^`  
 //}}AFX_DATA_MAP 63/a 0Yn  
} @W-0ybv  
C%H?vrR  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) afE)yu`  
 //{{AFX_MSG_MAP(CAboutDlg) $N\k*=  
 // No message handlers 8&yI1XM|  
 //}}AFX_MSG_MAP UT0}Ce>e  
END_MESSAGE_MAP() GI6]Ecc  
B[9y<FB+  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 5&qBG@Hw]  
: CDialog(CCaptureDlg::IDD, pParent) KkCsQ~po  
{ ehTv@2b  
 //{{AFX_DATA_INIT(CCaptureDlg) D!&]jkUN  
  m_bControl = FALSE; F ESl#.}  
  m_bAlt = FALSE; Uo;a$sR  
  m_bShift = FALSE; DMlr%)@ {  
  m_Path = _T("c:\\"); Vllxv6/_  
  m_Number = _T("0 picture captured."); Ko0?c.l  
  nCount=0; p}8?#5`/w  
  bRegistered=FALSE; 3Uej]}c  
  bTray=FALSE; _{$<s[S  
 //}}AFX_DATA_INIT zwk& 3  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 v[V7$.%5Q  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); v2k@yxt(  
} tXcZl!3x  
s"R5'W\U  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) S_?sJwM  
{ Po*!eD  
 CDialog::DoDataExchange(pDX); & H8  %  
 //{{AFX_DATA_MAP(CCaptureDlg) 3n~O&{  
  DDX_Control(pDX, IDC_KEY, m_Key); qiH)J- ~GZ  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); m|3 Q'  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 88l1g,`**  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); u;+8Jg+xH/  
  DDX_Text(pDX, IDC_PATH, m_Path); RAWzQE }  
  DDX_Text(pDX, IDC_NUMBER, m_Number); i|m8#*Hd  
 //}}AFX_DATA_MAP 2#/23(Wc  
} *Qyu QF  
&4ndi=.#rg  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) b[<L l%K  
//{{AFX_MSG_MAP(CCaptureDlg) /B)2L]6p  
 ON_WM_SYSCOMMAND() Mfnfp{.)  
 ON_WM_PAINT() ?TJ4L/"(k6  
 ON_WM_QUERYDRAGICON() sDAP'&  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) E1SWZ&';  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) bo1J'pU  
 ON_BN_CLICKED(ID_CHANGE, OnChange) sf/m@425  
//}}AFX_MSG_MAP TbLU[(m-n  
END_MESSAGE_MAP() ~'F.tB  
4U~'Oa @p  
BOOL CCaptureDlg::OnInitDialog() <KfR)7I$0a  
{ 9WI5\`*"  
 CDialog::OnInitDialog(); X ]W)D S  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); hV:++g  
 ASSERT(IDM_ABOUTBOX < 0xF000); ;e.8EL  
 CMenu* pSysMenu = GetSystemMenu(FALSE); [5ncBY*A7  
 if (pSysMenu != NULL) 4ETHaIiWp  
 { TU': Rt  
  CString strAboutMenu; {{?MO{Mh*  
  strAboutMenu.LoadString(IDS_ABOUTBOX); |=07n K2  
  if (!strAboutMenu.IsEmpty()) bR,Es~n  
  { \iaZV.#f  
   pSysMenu->AppendMenu(MF_SEPARATOR);  A@9\Qd  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); <v/aquLN  
  } :,fT^izew  
 } Zu2`IzrG#  
 SetIcon(m_hIcon, TRUE); // Set big icon JY@bD:  
 SetIcon(m_hIcon, FALSE); // Set small icon vG7Mk8mIr  
 m_Key.SetCurSel(0); \Zh&[D!2  
 RegisterHotkey(); ay|jq "a  
 CMenu* pMenu=GetSystemMenu(FALSE); <B>hvuCoH  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); p3Ozfk  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); -<9Qez)y  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); {~w(pAx  
 return TRUE; // return TRUE unless you set the focus to a control h(R7y@mp\0  
} fDqDU  
HEAW](s  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) % 8wBZ~1-  
{ $-u c#57  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) :,M+njcFc  
 { 'HJ+)[0X*  
  CAboutDlg dlgAbout; v 2 p  
  dlgAbout.DoModal(); p(nO~I2E  
 } TspX7<6r  
 else  Na@;F{  
 { bI|{TKKN&P  
  CDialog::OnSysCommand(nID, lParam); *JfGGI_E  
 } L>mM6$l  
} QAt]sat  
d3 i(UN]  
void CCaptureDlg::OnPaint() :y`LF <  
{ \F-n}Z  
 if (IsIconic()) 4f~sRubK  
 { ?@Q0;LG  
  CPaintDC dc(this); // device context for painting <T;V9(66  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); *C0a,G4  
  // Center icon in client rectangle 8EMBqhl  
  int cxIcon = GetSystemMetrics(SM_CXICON); cvo+{u$s  
  int cyIcon = GetSystemMetrics(SM_CYICON); K F_Uu  
  CRect rect; x;`G n_  
  GetClientRect(&rect); )+|wrK:*v  
  int x = (rect.Width() - cxIcon + 1) / 2; ,X1M!'  
  int y = (rect.Height() - cyIcon + 1) / 2; (X-( WMsqQ  
  // Draw the icon :*BN>*1^\r  
  dc.DrawIcon(x, y, m_hIcon); jMCd`Q]K  
 } q,<l3rIn  
 else 6 rj iZ%  
 { xf/K+  
  CDialog::OnPaint(); . AOc$Nt  
 } mtkZF{3Jx  
} M$Ui=GGq  
]kx<aQ^  
HCURSOR CCaptureDlg::OnQueryDragIcon() 0^\H$An*k  
{ S.Kcb=;"L  
 return (HCURSOR) m_hIcon; j,;f#+O`g  
} SXYwhID=  
&WLN   
void CCaptureDlg::OnCancel() R9^vAS4t[O  
{ H\n6t-l  
 if(bTray) DTuco9yr[  
  DeleteIcon(); H ?9Bo!  
  CDialog::OnCancel(); ;dMr2y`6  
} jA;b2A]G  
ezbk@no  
void CCaptureDlg::OnAbout() -,YI>!  
{ YpXd5;'  
 CAboutDlg dlg; ky]^N)  
 dlg.DoModal(); ,/GFD[SQ  
} 5Za<]qxr  
>yLDU_P)  
void CCaptureDlg::OnBrowse() rir,|y,  
{ =OtW!vx#R.  
 CString str; d*e8P ep  
 BROWSEINFO bi; qdwo2u  
 char name[MAX_PATH]; wJJ|]^0.  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Gey-8  
 bi.hwndOwner=GetSafeHwnd(); _<jU! R  
 bi.pszDisplayName=name; ,mvFeo;@f  
 bi.lpszTitle="Select folder"; H)E,([   
 bi.ulFlags=BIF_RETURNONLYFSDIRS; g.Qn,l]X/p  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~PQR_?1  
 if(idl==NULL) h lc!}{$%8  
  return; c^'bf_~-W  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ,1B4FAR&  
 str.ReleaseBuffer(); m <z?6VC  
 m_Path=str; {+cx}`  
 if(str.GetAt(str.GetLength()-1)!='\\') M,p0wsj;  
  m_Path+="\\"; yK"\~t[@X:  
 UpdateData(FALSE); RA!m,"RM  
} w5)KWeGa  
04=RoYMM  
void CCaptureDlg::SaveBmp() Q.7X3A8  
{ W ^Fkjqpv  
 CDC dc; PWvTC`?  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); p=eSJ*  
 CBitmap bm; CdCY#$Z  
 int Width=GetSystemMetrics(SM_CXSCREEN); *^7^g!=z2  
 int Height=GetSystemMetrics(SM_CYSCREEN); R+He6c!?9  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ~H?v L c;>  
 CDC tdc; > 2/j  
 tdc.CreateCompatibleDC(&dc); n} !')r  
 CBitmap*pOld=tdc.SelectObject(&bm); *L>usLh  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); z;@<J8I  
 tdc.SelectObject(pOld); s0vcGh#w  
 BITMAP btm; ] s 2ec  
 bm.GetBitmap(&btm); DwFvM0O6\  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; )>b1%x} =  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Sh-B!  
 BITMAPINFOHEADER bih; Z ]ZUK  
 bih.biBitCount=btm.bmBitsPixel; ^-s7>F`jx  
 bih.biClrImportant=0; AVU'rsXA  
 bih.biClrUsed=0; 2,B^OZmw  
 bih.biCompression=0; pX>wMc+  
 bih.biHeight=btm.bmHeight; Ekrpg^3qp"  
 bih.biPlanes=1; W^ask[46R  
 bih.biSize=sizeof(BITMAPINFOHEADER); o](ORS$~  
 bih.biSizeImage=size; !IC .0I`  
 bih.biWidth=btm.bmWidth; H&F2[j$T  
 bih.biXPelsPerMeter=0; bzZdj6>kX  
 bih.biYPelsPerMeter=0; @q]!C5  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 'cQ`jWZQ  
 static int filecount=0; Sjw wc6_c  
 CString name; _}']h^@ Z  
 name.Format("pict%04d.bmp",filecount++); Gv8Z  
 name=m_Path+name; +|+fDQI  
 BITMAPFILEHEADER bfh; 0L"uU3  
 bfh.bfReserved1=bfh.bfReserved2=0; yJqDB$0  
 bfh.bfType=((WORD)('M'<< 8)|'B'); :18}$  
 bfh.bfSize=54+size; R*W1<W%q=  
 bfh.bfOffBits=54; wV$V X  
 CFile bf; P&5vVA6K7  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #q0xlF@  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); #\Q)7pgi.  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); W0U|XX!&  
  bf.WriteHuge(lpData,size); p((.(fx  
  bf.Close(); P??pWzb6HH  
  nCount++; ?H!&4o  
 } n Zx^ej\  
 GlobalFreePtr(lpData); T?u*ey~Tv  
 if(nCount==1) w8>bct3@  
  m_Number.Format("%d picture captured.",nCount); {BAZ`I  
 else O f-gG~  
  m_Number.Format("%d pictures captured.",nCount); C`3fM05g  
  UpdateData(FALSE); -ECnX/ "  
} 98<^!mwF  
c[OQo~m$  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) M5`m5qc3  
{ hdM?Uoo(4a  
 if(pMsg -> message == WM_KEYDOWN) *x 2u  
 { 3+U2oI:I  
  if(pMsg -> wParam == VK_ESCAPE) X88I|Z'HIh  
   return TRUE; 5/m*Lc+r  
  if(pMsg -> wParam == VK_RETURN) Ai)Q(]  
   return TRUE; Z$YG'p{S  
 } <bv9X?U  
 return CDialog::PreTranslateMessage(pMsg); G Wj !n  
} p<@+0Uw2  
GBd mT-7  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) &w%%^ +n |  
{ Pm24;'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ J(XK%e[8  
  SaveBmp(); (@\0P H0  
  return FALSE; zCwb>v  
} RhjU^,%  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ L`^ v"W()  
 CMenu pop; \jkDRR[  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4=* ml}RP  
 CMenu*pMenu=pop.GetSubMenu(0); :NH '>'  
 pMenu->SetDefaultItem(ID_EXITICON); ^'sOWIzeiY  
 CPoint pt; &j{I G`Trl  
 GetCursorPos(&pt); F20%r 0  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); L#IY6t  
 if(id==ID_EXITICON) 8Waic&lX~  
  DeleteIcon(); )=,;-&AR  
 else if(id==ID_EXIT) 6X VJ/qZ  
  OnCancel(); u`*$EP-%  
 return FALSE; c/3]M>+M  
} ?* dfIc  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); $~A\l@xAG  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) e7U9"pk  
 AddIcon(); ?nR$>a`  
 return res; mA3yM#  
} hJJo+NNN  
(jE[W:  
void CCaptureDlg::AddIcon() \ $9n `  
{ Y:'c<k  
 NOTIFYICONDATA data; jLul:* L  
 data.cbSize=sizeof(NOTIFYICONDATA); k1FG$1.  
 CString tip; ~BI! l  
 tip.LoadString(IDS_ICONTIP); 3e^'mT  
 data.hIcon=GetIcon(0); rf&nTDaWI  
 data.hWnd=GetSafeHwnd(); gBd~:ZUa  
 strcpy(data.szTip,tip); _NbhWv  
 data.uCallbackMessage=IDM_SHELL; dFpP_U  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; L w/ZKXDU2  
 data.uID=98; FC8= ru  
 Shell_NotifyIcon(NIM_ADD,&data); N sSl|m  
 ShowWindow(SW_HIDE); sWLH"'Z  
 bTray=TRUE; WOGMt T%  
} g[xn0 rG  
3Q+THg3~?  
void CCaptureDlg::DeleteIcon() qSL~A-  
{ KH1/B_.\V  
 NOTIFYICONDATA data; X@B,w_b  
 data.cbSize=sizeof(NOTIFYICONDATA); f^XfIH_#  
 data.hWnd=GetSafeHwnd(); !r0 z3^*N  
 data.uID=98; /lvH p  
 Shell_NotifyIcon(NIM_DELETE,&data); W}oAgUd  
 ShowWindow(SW_SHOW); VoUAFEcs  
 SetForegroundWindow(); C? b_E  
 ShowWindow(SW_SHOWNORMAL); NslaG  
 bTray=FALSE; v*e=oyx[  
} LZ~$=<  
&$NVEmW-J  
void CCaptureDlg::OnChange() AyZBH &}RZ  
{ ~48mCD  
 RegisterHotkey(); ;0++):30V  
} ;,LlOR  
`\S~;O  
BOOL CCaptureDlg::RegisterHotkey() uwb>q"M  
{ ?Wp{tB9N0  
 UpdateData(); }Rq-IRa'  
 UCHAR mask=0; i+.bR.WO  
 UCHAR key=0; /F @a@m|  
 if(m_bControl) Ucok&)7-  
  mask|=4; 1hgmlY`  
 if(m_bAlt) UbV} !  
  mask|=2; B bx.RL.V  
 if(m_bShift) t) ~v5vr  
  mask|=1; E|^~R}z)  
  key=Key_Table[m_Key.GetCurSel()]; 30/(  
 if(bRegistered){ %"RgW\s[R  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ma26|N5  
  bRegistered=FALSE; ag$UNV  
 } lV!@h}mG  
 cMask=mask; +2]{% =  
 cKey=key; w-MnJ(r  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); E%+1^ L  
 return bRegistered; l4Y}<j\;  
} =zW.~(c{  
PfVjfrI[  
  四、小结 D(<20b,  
+Gvf5+ 5VR  
  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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