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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: '9XwUQx  
  tWI hbt  
  一、实现方法 2c]O Mtk  
' ?t{-z,  
  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: t-/^O  
IRB;Q(Z   
#pragma data_seg("shareddata") `0N/ /Q  
HHOOK hHook =NULL; //钩子句柄 \g/E4U .+  
UINT nHookCount =0; //挂接的程序数目 P6rL;_~e  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 S)?B  I  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 '#?hm-Ga  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey p9J(,}  
static int KeyCount =0; u"ow?[E  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 3kg+*]tLx  
#pragma data_seg() &(0);I@fc  
q~C6+  
  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。 QKxu vW  
up6LO7drW/  
  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: 9AaixI  
4 @h6|=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 1>1!oml1E  
cKey,UCHAR cMask) $2 0*&4y^  
{ o? =u#=  
 BOOL bAdded=FALSE; SZEr  
 for(int index=0;index<MAX_KEY;index++){ de[_T%A  
  if(hCallWnd[index]==0){ #=rI[KI  
   hCallWnd[index]=hWnd; @*dA<N.9  
   HotKey[index]=cKey; FS[CUoA  
   HotKeyMask[index]=cMask; O.!?O(  
   bAdded=TRUE; RIlPH~  
   KeyCount++; Zzs pE}  
   break; DlP=R  
  } '_8Vay~  
 } NDi@x"];  
 return bAdded; S5vJC-"  
} 89l}6p/L  
//删除热键 3%k+<ho(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) N?p $-{  
{ -xXM/3g1u  
 BOOL bRemoved=FALSE; h2 y@xnn  
 for(int index=0;index<MAX_KEY;index++){ m`t7-kiZ  
  if(hCallWnd[index]==hWnd){ ;|c,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =`")\?z}  
    hCallWnd[index]=NULL; mz''-1YY$  
    HotKey[index]=0; ~W4<M:R  
    HotKeyMask[index]=0; BScysoeD  
    bRemoved=TRUE; <GC:aG  
    KeyCount--; #cA}B L!3  
    break; 4Y'qo M;  
   } @: NrC76  
  } _IGQ<U<z  
 } aG!!z>  
 return bRemoved; ^?,/_3  
} g.'4uqU  
#~Q0s)Ze  
~![R\gps  
  DLL中的钩子函数如下: f;*\y!|lg~  
#t\Oq9}^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) #"jWPe,d  
{ J_tJj8  
 BOOL bProcessed=FALSE; _h#G-  
 if(HC_ACTION==nCode) }  ?  
 { :98Pe6  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 l#%w,gX  
   switch(wParam) na~ r}7 7o  
   {  OT zh=Z^r  
    case VK_MENU: ,}[,]-nVx  
     MaskBits&=~ALTBIT; ^I^k4iw 4  
     break; 8Og9P1jVh  
    case VK_CONTROL: vwg\qKqSM  
     MaskBits&=~CTRLBIT; }9'rTLM  
     break; Jyn>:Yq(  
    case VK_SHIFT: J{91 t |  
     MaskBits&=~SHIFTBIT; kZ2+=/DYN  
     break; = hpX2/]  
    default: //judge the key and send message +`ZcYLg)#  
     break; xH0Bk<`V:  
   } WW&0FugY_  
   for(int index=0;index<MAX_KEY;index++){ ~k&b3-A}  
    if(hCallWnd[index]==NULL) 6SpkeXL  
     continue; N$. ''D?7D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X"R;/tZ S4  
    { 3Vhm$y%Td  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); joa$Y6  
     bProcessed=TRUE; 2'++G[z  
    } -y~JNDS1]  
   } xv /w %  
  } TJCoID7a8  
  else if((lParam&0xc000ffff)==1){ //有键按下 -7lJ  
   switch(wParam) UrgvG, Lt  
   { }/6jom9U?  
    case VK_MENU: +Q{jV^IT9  
     MaskBits|=ALTBIT; (2S,0MHk  
     break; O32:j   
    case VK_CONTROL: >_R5Li  
     MaskBits|=CTRLBIT; h><;TAp  
     break; 7Y_S%B:F  
    case VK_SHIFT: _M 7AQ5  
     MaskBits|=SHIFTBIT; p%n}a%%I  
     break; HYtkSsXLN  
    default: //judge the key and send message 9nB:=`T9  
     break; t4nAy)I)P  
   } %_5B"on  
   for(int index=0;index<MAX_KEY;index++){ k38Ds_sW6d  
    if(hCallWnd[index]==NULL) o rEo$e<  
     continue; C! :\H<gI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >2_J(vm>  
    { TkK- r(=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); KktQA*G  
     bProcessed=TRUE; H4)){\  
    } sb;81?|  
   } f9!wO';P6  
  } ~6R| a  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 m]V5}-?al  
   for(int index=0;index<MAX_KEY;index++){ !Y5O3^I=u  
    if(hCallWnd[index]==NULL) (CEJg|,  
     continue; I'C{=?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ybfNG@N*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); &K}!R$[,:P  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 2mI=V.X[&  
   } 9c<lFZb;  
  } , !c.  
 } 8K{ TRPy  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 5pz%DhjLo  
} .F9>|Xx[  
D\>CEBt  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: S&9{kt|BI  
!\CoJ.5=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^;N +"oq!y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); s fazrz`h  
#;H+Kb5O  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: .0nL; o  
7\5;;23N4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =d`,W9D  
{ qbmy~\ZY  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) w$pBACX  
 { EI]NOG 0  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ']>@vo4kK{  
  SaveBmp(); JhIgq W2  
  return FALSE; z6$W@-Vd  
 } [|e7oNT(Q  
 …… //其它处理及默认处理 x?T/=C  
} 1)vdM(y3j  
wS#.W zp.w  
K t9:V,  
  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。 On#RYy^}  
q*,];j/>k  
  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。 YcT!`B   
_yumUk-QW  
  二、编程步骤 Em-88=X O  
$#1i@dI  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; //Ck1cI#h  
0[ jy  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; q B5cF_  
7$k[cL1  
  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; +U% = w8b  
{!@Pho)Q  
  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; \2@OS6LUe  
* 3WK`9q  
  5、 添加代码,编译运行程序。 YeK PoW  
1W;q(#q  
三、程序代码 `A])4q$  
L@XhgQ  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL b&. o9PV"  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) (pNA8i%=G  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ =EgiV<6vcH  
#if _MSC_VER > 1000 C|8.$s<  
#pragma once " 8>*O;xk  
#endif // _MSC_VER > 1000 Ns?y) G>:  
#ifndef __AFXWIN_H__ 9=89)TrY  
#error include 'stdafx.h' before including this file for PCH /w$<0hH#'8  
#endif '/G.^Zl9  
#include "resource.h" // main symbols wz<YflF  
class CHookApp : public CWinApp PSNfh7g  
{ .-Ggvw  
 public: H[BY(a@c  
  CHookApp(); \E5%.KR  
  // Overrides TeSF  
  // ClassWizard generated virtual function overrides VD#`1g<  
  //{{AFX_VIRTUAL(CHookApp) |W<wPmW_{+  
 public: d~u+:[\=/  
  virtual BOOL InitInstance(); B>Mr /'  
  virtual int ExitInstance(); x!"S`AM  
  //}}AFX_VIRTUAL qQv?J]l  
  //{{AFX_MSG(CHookApp) =rFgOdj  
  // NOTE - the ClassWizard will add and remove member functions here. 3FR'N%+  
  // DO NOT EDIT what you see in these blocks of generated code ! UB|f{7~&  
  //}}AFX_MSG i!@L`h!rw  
  DECLARE_MESSAGE_MAP() t ]7>' U  
}; 8HS1^\~(6l  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); `9SuDuw;s  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); tT>~;l%'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8&\<p7}=h  
BOOL InitHotkey(); l1 fP@|  
BOOL UnInit(); +pURF&Pr  
#endif 3@f@4t@5V  
Yh\ } i  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 0.Pd,L(  
#include "stdafx.h" CXwDG_e  
#include "hook.h" *W~+Nho.A  
#include <windowsx.h> ]#z^G  
#ifdef _DEBUG <nOK#;O)  
#define new DEBUG_NEW ,IX:u1mO  
#undef THIS_FILE Ii_X^)IL(  
static char THIS_FILE[] = __FILE__; fH-V!QYGF  
#endif >vF=}1_L  
#define MAX_KEY 100  A M8bem~  
#define CTRLBIT 0x04 o|F RG{TJ  
#define ALTBIT 0x02 p)NhV  
#define SHIFTBIT 0x01 WLqwntzk  
#pragma data_seg("shareddata") 96x0'IsaG  
HHOOK hHook =NULL; apPn>\O  
UINT nHookCount =0; c4E=qgP  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey cD{I*t$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Y5M>&}N  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey  BR;f!  
static int KeyCount =0; OsAH!e  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift n@r'b{2;l  
#pragma data_seg() Q[O[,Rk  
HINSTANCE hins; </(bwc~2  
void VerifyWindow(); Z6#}6Y{  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) L?T%;VdG'>  
//{{AFX_MSG_MAP(CHookApp) wyvrNru<l4  
// NOTE - the ClassWizard will add and remove mapping macros here. M}MXR=X,  
// DO NOT EDIT what you see in these blocks of generated code! O:3LA-vA  
//}}AFX_MSG_MAP %Aq+t&-BCX  
END_MESSAGE_MAP() h)2W}p{a4=  
eAR]~ NiW  
CHookApp::CHookApp() D^V0kC p!F  
{ _7Z|=)  
 // TODO: add construction code here, xFvDKW)_X7  
 // Place all significant initialization in InitInstance })f4`$qf  
} d#6'dKV$  
:\[W]  
CHookApp theApp; 5RD\XgyN]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $Kw)BnV  
{ R1u1  
 BOOL bProcessed=FALSE; ". #=_/op  
 if(HC_ACTION==nCode) kW=g:m  
 { QhUv(]0   
  if((lParam&0xc0000000)==0xc0000000){// Key up 6Tjj++b(*  
   switch(wParam) t4>%<'>e  
   { A82Bn|J  
    case VK_MENU: hqOy*!8'@  
     MaskBits&=~ALTBIT; "5Orj*{  
     break; %v 0 I;t  
    case VK_CONTROL: 6 B>1"h%Wf  
     MaskBits&=~CTRLBIT; -? {bCq  
     break; 2~<N  
    case VK_SHIFT: z=C'qF`  
     MaskBits&=~SHIFTBIT; (T+fO}0  
     break; wn2+4> |~p  
    default: //judge the key and send message xrb %-vT  
     break; Rrh?0qWs  
   } \l)<NZ\  
   for(int index=0;index<MAX_KEY;index++){ ODa+s>a`^  
    if(hCallWnd[index]==NULL) [^sv.  
     continue; 0Yk@O) x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k1Cx~Q)XC  
    { xdw"JS}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); it V@U  
     bProcessed=TRUE; {!h|(xqN+  
    } $=?1>zvF  
   } ".aypD)W  
  } tg%s#lLeH  
  else if((lParam&0xc000ffff)==1){ //Key down >; a_i>[  
   switch(wParam) T 1'8<pJ^  
   { =xz Dpn>f  
    case VK_MENU: z/09~Hc  
     MaskBits|=ALTBIT; DL0jA/f  
     break; )9LlM2+y  
    case VK_CONTROL: hwgLJY?  
     MaskBits|=CTRLBIT; F|.,lb |L  
     break; GiI|6z!  
    case VK_SHIFT: @ n<y[WA  
     MaskBits|=SHIFTBIT; L,G{ t^j  
     break; Ucnj7>+"  
    default: //judge the key and send message wV\;,(<x=%  
     break; a|aRUxa0"  
   } xe ng`!  
   for(int index=0;index<MAX_KEY;index++) zGKDH=Yy ;  
   { lFvRXV^+f  
    if(hCallWnd[index]==NULL) :6R0=oz  
     continue; hF`e>?bN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W[B%,Km%]  
    { t [gz#'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #m 2Ss  
     bProcessed=TRUE; $v|/*1S  
    } 7)iB6RB K  
   } &.XYI3Ab1  
  } R7axm<PR=  
  if(!bProcessed){ =fA* b  
   for(int index=0;index<MAX_KEY;index++){ MLD-uI10{  
    if(hCallWnd[index]==NULL) `U:W(\L  
     continue; N$u;Q(^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }<?1\k  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9nW/pv  
   } 1e=<df  
  } xDtq@Rb}  
 } =apcMW(zn  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #H]b Xr  
} g )H>Uu5@  
pPr/r& r  
BOOL InitHotkey() rHhn)m  
{ ] Tc!=SV  
 if(hHook!=NULL){ cH$zDm1  
  nHookCount++; />1Ndj  
  return TRUE; (S ~|hk^  
 } 43_;Z| T  
 else j TVh`d< N  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); :|%dV}j  
  if(hHook!=NULL) ]WLQ q4q  
   nHookCount++; m$glRs @  
  return (hHook!=NULL); o)w8 ]H /  
} _3_d;j#G U  
BOOL UnInit() rKZ1 c,y  
{ |a!AgvNF  
 if(nHookCount>1){ f n]rMH4>  
  nHookCount--; kaSi sjd  
  return TRUE; @  s  
 } h4@v. GI  
 BOOL unhooked = UnhookWindowsHookEx(hHook); CE :x;!}cd  
 if(unhooked==TRUE){  Co e q<  
  nHookCount=0; 9Z! j  
  hHook=NULL; a%3V< "f  
 } (dSf>p r2  
 return unhooked; G01J1Ll}  
}  XL@Y!  
5HWVK.  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z0yy<9q]2  
{ ?_Sf  
 BOOL bAdded=FALSE; ["FC   
 for(int index=0;index<MAX_KEY;index++){ 53y,eLf  
  if(hCallWnd[index]==0){ \W^Mo>l  
   hCallWnd[index]=hWnd; <sXmk{  
   HotKey[index]=cKey; w&6c`az8  
   HotKeyMask[index]=cMask; EBF608nWfW  
   bAdded=TRUE; $i# 1<Qj  
   KeyCount++; | CNsa  
   break; k+*DPo@)  
  } V*an0@  
 } RRYm.dMIw  
 return bAdded; `o7m)T')  
} 8<z]rLQw?%  
}(}+I}&~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) zj G>=2  
{ We^! (G  
 BOOL bRemoved=FALSE; dV{N,;z  
 for(int index=0;index<MAX_KEY;index++){ M>Y ge~3  
  if(hCallWnd[index]==hWnd){ 1$cX` D`  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [8Zq 1tU;G  
    hCallWnd[index]=NULL; RI,Z&kXj2o  
    HotKey[index]=0; V{51wnxT  
    HotKeyMask[index]=0; lZpa)1.tiC  
    bRemoved=TRUE; jY.iQBhjEB  
    KeyCount--; 7|~j=,HU+Z  
    break; 3:q\]]]S  
   } %m8;Lh- X  
  } >s\j/yM  
 } KEfn$\  
 return bRemoved; ujF*'*@\  
} l=jfgsjc  
lYZ5FacqC  
void VerifyWindow() CuE>=y- "I  
{ _)4YxmK%  
 for(int i=0;i<MAX_KEY;i++){ t?[|oz:v  
  if(hCallWnd!=NULL){  [Tha j  
   if(!IsWindow(hCallWnd)){ \k6Ho?PL  
    hCallWnd=NULL; +.i?UHNB  
    HotKey=0; J{98x zb  
    HotKeyMask=0; =F>@z4[P-  
    KeyCount--; MGUzvSf  
   } 7 S^iGe  
  } ?sb Ob  
 } ,TuDG*YA  
} nF0V`O \T  
b >R/=tx  
BOOL CHookApp::InitInstance() !L3M\Q0  
{ cE7xNZ;Bh  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); FB<#N+L\  
 hins=AfxGetInstanceHandle(); 'B;aXy/JC  
 InitHotkey(); >BC?% |l  
 return CWinApp::InitInstance(); oH/6  
} j(j o8  
;F)g r  
int CHookApp::ExitInstance() 'jv[Gcss3L  
{ eT??F  
 VerifyWindow(); vB0O3]  
 UnInit(); UL0%oJ#  
 return CWinApp::ExitInstance(); ]e0yC  
} zh2gU@"  
R(dVE\u  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file sS$"6  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 'n> ,+,&  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ L4th 7#  
#if _MSC_VER > 1000 Fv n:V\eb  
#pragma once oObm5e*Z  
#endif // _MSC_VER > 1000 x,W)qv  
uus}NZ:*l  
class CCaptureDlg : public CDialog E}U[VtaC  
{ S"FIQ&n  
 // Construction $t' .  
 public: &V;^xMO!  
  BOOL bTray; 8nOMyNpy~M  
  BOOL bRegistered; ,Y~{RgG  
  BOOL RegisterHotkey(); np|3 os  
  UCHAR cKey; `I$'Lp#5  
  UCHAR cMask; =3rPE"@,[  
  void DeleteIcon(); oiP8~  
  void AddIcon(); VV/6~jy0  
  UINT nCount; lSw9e<jYO  
  void SaveBmp(); }wmn v  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 4_3O?IY  
  // Dialog Data /]=d Pb%  
  //{{AFX_DATA(CCaptureDlg) t7|uZHKK  
  enum { IDD = IDD_CAPTURE_DIALOG }; odxsF(Q0p  
  CComboBox m_Key; M{Ss?G4H  
  BOOL m_bControl; J8|F8dcz  
  BOOL m_bAlt; >*ey 7g  
  BOOL m_bShift; #E`-b9Q  
  CString m_Path; Z5aU7  
  CString m_Number; A^+G w\  
  //}}AFX_DATA fFD:E} >5  
  // ClassWizard generated virtual function overrides ?haN ;n6'  
  //{{AFX_VIRTUAL(CCaptureDlg) Y40Hcc+Fx  
 public: +hdD*}qauC  
  virtual BOOL PreTranslateMessage(MSG* pMsg);  |*079v  
 protected: [t55Kz*cD  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5ru&In&  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); C2GF N1i  
  //}}AFX_VIRTUAL I8r5u=PH  
  // Implementation X#9}|rT56  
 protected: b-e3i;T!}~  
  HICON m_hIcon; 1(C3;qlVD  
  // Generated message map functions  V"n0"\k,  
  //{{AFX_MSG(CCaptureDlg) y7#$:+jQv  
  virtual BOOL OnInitDialog(); zNT~-  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); y(&JE^GfX  
  afx_msg void OnPaint(); 2.)@u~^Q  
  afx_msg HCURSOR OnQueryDragIcon(); T:+%3+;a  
  virtual void OnCancel(); F"O{eK0T  
  afx_msg void OnAbout(); +W+O7SK\y  
  afx_msg void OnBrowse(); td^2gjr^5  
  afx_msg void OnChange(); ;Ab`b1B  
 //}}AFX_MSG *ayn<Vlh`^  
 DECLARE_MESSAGE_MAP() mQt';|X@  
}; %1ofu,%  
#endif h4C DZ  
r(`;CY]@  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file (p<QRb:&Z  
#include "stdafx.h" '| Enc"U  
#include "Capture.h" <VD^f  
#include "CaptureDlg.h" YH33E~f  
#include <windowsx.h> 0-~Y[X"9.  
#pragma comment(lib,"hook.lib") /3D!,V,  
#ifdef _DEBUG #yZZ$XOk  
#define new DEBUG_NEW ?c)PBJ+]  
#undef THIS_FILE V6l*!R  
static char THIS_FILE[] = __FILE__; Ojj:YLlY>  
#endif 0'!v-`.  
#define IDM_SHELL WM_USER+1 P<b.;Oz__-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); L-_dq0T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5Cxh >,k  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; d=%:rLm$  
class CAboutDlg : public CDialog /sY(/ J E  
{ ;\7TQ9z  
 public: *OU>s;"$  
  CAboutDlg(); IVD1 mk  
  // Dialog Data 6zs&DOB  
  //{{AFX_DATA(CAboutDlg) .$b]rx7$ ~  
  enum { IDD = IDD_ABOUTBOX }; }K,:aN,44\  
  //}}AFX_DATA dsP|j (y  
  // ClassWizard generated virtual function overrides .+3= H@8h  
  //{{AFX_VIRTUAL(CAboutDlg) QjETu  
 protected: 6U;pYWht  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %]%.{W\j3  
  //}}AFX_VIRTUAL Lv@JfN"O  
  // Implementation }$u]aX<  
 protected: vlCjh! x  
  //{{AFX_MSG(CAboutDlg) ]T\K-;i  
  //}}AFX_MSG 2V(ye9  
  DECLARE_MESSAGE_MAP() 9 v)p0  
}; =W)Fa6P3j(  
~[XDK`B  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) q[{q3-W  
{ y XZZ)i_  
 //{{AFX_DATA_INIT(CAboutDlg) @O+yxGA  
 //}}AFX_DATA_INIT *leQd^47  
} ]xQPSs_  
6Uq@v8mh  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) R`ajll1  
{ :P`sK&b_  
 CDialog::DoDataExchange(pDX); x8%Q TTY  
 //{{AFX_DATA_MAP(CAboutDlg) f9H;e(D9]  
 //}}AFX_DATA_MAP j>~^jz:  
} XNwY\y  
V ~w(^;o@  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $wU.GM$t~  
 //{{AFX_MSG_MAP(CAboutDlg) " |RP_v2  
 // No message handlers B1m@  
 //}}AFX_MSG_MAP `L`*jA+_  
END_MESSAGE_MAP() A<^IG+Q,B7  
AbUPJF"F  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) r/=v;4.W  
: CDialog(CCaptureDlg::IDD, pParent) &'V_80vA  
{ 4xhV +Y  
 //{{AFX_DATA_INIT(CCaptureDlg) Z@&_ T3M  
  m_bControl = FALSE; NylN-X7[#  
  m_bAlt = FALSE; @& #df  
  m_bShift = FALSE; p3I{  
  m_Path = _T("c:\\"); t/WauY2JUC  
  m_Number = _T("0 picture captured."); Fh& ` v0  
  nCount=0; i`7{q~d=  
  bRegistered=FALSE; 6PT ,m  
  bTray=FALSE; t,= ta{ a  
 //}}AFX_DATA_INIT kH d_q.  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 'p-jMD}O  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); `,H\j?  
} *#e%3N05_  
uS bOGhP  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Rct|"k_"Ys  
{ `48jL3|  
 CDialog::DoDataExchange(pDX); Xtbuy/8"1  
 //{{AFX_DATA_MAP(CCaptureDlg) *3WK:0  
  DDX_Control(pDX, IDC_KEY, m_Key); 62rTGbDbx  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); xksQMS2#  
  DDX_Check(pDX, IDC_ALT, m_bAlt); !uLAW_~  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); k:s}`h _n  
  DDX_Text(pDX, IDC_PATH, m_Path); Xhtc0\0"(  
  DDX_Text(pDX, IDC_NUMBER, m_Number); /A}3kTp  
 //}}AFX_DATA_MAP hLGUkG?6G  
} >8Zz<S&z  
7&XU]I  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 7!w@u6Q  
//{{AFX_MSG_MAP(CCaptureDlg) 5+rYk|*D+k  
 ON_WM_SYSCOMMAND() -"u}lCz>  
 ON_WM_PAINT() fJLlz$H  
 ON_WM_QUERYDRAGICON() 85$MHod}[,  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) QKc3Q5)@j  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) "5Oog<  
 ON_BN_CLICKED(ID_CHANGE, OnChange) sY7:Lzs.,  
//}}AFX_MSG_MAP #9O *@  
END_MESSAGE_MAP() UoPd>q4Uj  
~6.AE/ow  
BOOL CCaptureDlg::OnInitDialog() pA3j@w  
{ iq,qf)BY.|  
 CDialog::OnInitDialog(); yxQxc5/X)  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ]8ua>1XS  
 ASSERT(IDM_ABOUTBOX < 0xF000); /@R|*7K;9  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 'Kxs>/y3  
 if (pSysMenu != NULL) -en:81a#  
 { WqqrfzlM  
  CString strAboutMenu; '@2pOq  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 5[`!\vCiZ  
  if (!strAboutMenu.IsEmpty()) \6)l(b;  
  { 5fv eQI~!  
   pSysMenu->AppendMenu(MF_SEPARATOR); g[*+R9'  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #tN)OZA  
  } \:4WbM:B  
 } %\\l/{`eW  
 SetIcon(m_hIcon, TRUE); // Set big icon E}c(4RY  
 SetIcon(m_hIcon, FALSE); // Set small icon  rmUT l  
 m_Key.SetCurSel(0); Hq$AF  
 RegisterHotkey();  ;4 R1  
 CMenu* pMenu=GetSystemMenu(FALSE); X3(:)zUL  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ()JM161  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); DF%\ 1C>  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); * gr{{c  
 return TRUE; // return TRUE unless you set the focus to a control kLR4?tX!  
} m46Q%hwV  
sI/Hcm  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) \ lP c,8)  
{ oc?,8I[P5  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Ge@./SGT  
 { ;nji<  
  CAboutDlg dlgAbout; !EF~I8d\]  
  dlgAbout.DoModal(); go m< V?$  
 } Dk&cIZ43  
 else );@Dr!H  
 { ~ 6 1?nu  
  CDialog::OnSysCommand(nID, lParam); jU)r~QhN  
 } _zI9 5  
} QOlm#S  
" ^ydoRZ  
void CCaptureDlg::OnPaint() H!4!1J.=xw  
{ 5xwztcR-  
 if (IsIconic()) Vky~yTL)\  
 { UMm<HQ  
  CPaintDC dc(this); // device context for painting SW UHHl  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); wg^#S  
  // Center icon in client rectangle &fdH HN  
  int cxIcon = GetSystemMetrics(SM_CXICON); m;WUp{'  
  int cyIcon = GetSystemMetrics(SM_CYICON); j;<Yje&Wz  
  CRect rect; -2o4v#d  
  GetClientRect(&rect); VxLq,$B76  
  int x = (rect.Width() - cxIcon + 1) / 2; (WR&Vt4Rh  
  int y = (rect.Height() - cyIcon + 1) / 2; l^:m!SA_  
  // Draw the icon LVq3 R 8A  
  dc.DrawIcon(x, y, m_hIcon); :HYqm*v;W  
 } bWt>tEnf  
 else vI{JBWE,S  
 { W tnZF]1:u  
  CDialog::OnPaint(); .UakO,"z  
 } rhMsZ={M  
} IQMk:  
A@j;H|  
HCURSOR CCaptureDlg::OnQueryDragIcon() Um)0jT  
{ '$ ~.x|  
 return (HCURSOR) m_hIcon; l2+qP{_4  
} 2JYp.CJv  
gTY\B.  
void CCaptureDlg::OnCancel() mwZesSxB_  
{ XPd>DH(Yc  
 if(bTray) `i8osX[&p  
  DeleteIcon(); a~Sf~ka  
  CDialog::OnCancel(); 8*6vX!Z|  
} r7c(/P^$G  
}+nC}A"BC  
void CCaptureDlg::OnAbout() NOP~?p  
{ pB|L%#.cW  
 CAboutDlg dlg; \OHsCG27  
 dlg.DoModal(); }.3F|H  
} _J}ce  
L=iaL[zdJ  
void CCaptureDlg::OnBrowse() +)^F9LPl  
{ [N$da=`wv  
 CString str; `mQY%p|  
 BROWSEINFO bi; U;D!m+.HK  
 char name[MAX_PATH]; [Oxmg?W  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); <P3r+ 1|R  
 bi.hwndOwner=GetSafeHwnd(); <t,uj.9_  
 bi.pszDisplayName=name; miCt)Qd  
 bi.lpszTitle="Select folder"; k sJz44  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 0AY23/  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); S59!+V  
 if(idl==NULL) n <6}  
  return; LU_@8i:  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ilw<Q-o4(  
 str.ReleaseBuffer(); KM g`O3_16  
 m_Path=str; Dn) =V.  
 if(str.GetAt(str.GetLength()-1)!='\\') &9$0v"`H  
  m_Path+="\\"; fa=#S  
 UpdateData(FALSE); SDcxro|8i  
} t LdBnf  
a^'1o9  
void CCaptureDlg::SaveBmp() $yIcut7  
{ VQZ3&]o  
 CDC dc; F8;M++  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); TYw0#ZXo  
 CBitmap bm; g^NdN46%  
 int Width=GetSystemMetrics(SM_CXSCREEN); YPDc /  
 int Height=GetSystemMetrics(SM_CYSCREEN); ?1xBhKq  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 3P6pQm'.f  
 CDC tdc; F 71  
 tdc.CreateCompatibleDC(&dc); +uM1#-+h  
 CBitmap*pOld=tdc.SelectObject(&bm); ge`)sB,  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 9bPQD{Qb  
 tdc.SelectObject(pOld); <]b}R;9v  
 BITMAP btm; j?jEWreq]~  
 bm.GetBitmap(&btm); ?g}n$%*5y!  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 4};!nYey!  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); *#+d j"  
 BITMAPINFOHEADER bih; X"(!\{ySI;  
 bih.biBitCount=btm.bmBitsPixel; *;7&  
 bih.biClrImportant=0; 7OS\j>hb~  
 bih.biClrUsed=0; W:aAe%S  
 bih.biCompression=0; I}p uN!  
 bih.biHeight=btm.bmHeight; UG s <<  
 bih.biPlanes=1; ~q?IG5s*Z  
 bih.biSize=sizeof(BITMAPINFOHEADER); `=^29LC#  
 bih.biSizeImage=size;  $hPAp}  
 bih.biWidth=btm.bmWidth; qDM/ 6xO  
 bih.biXPelsPerMeter=0; Wcz{": [  
 bih.biYPelsPerMeter=0; oIt.Pc~;'#  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); zG[fPD  
 static int filecount=0; [zm&}$nnN  
 CString name; %/oOM\} ++  
 name.Format("pict%04d.bmp",filecount++); t^Aios~F  
 name=m_Path+name; Fla[YWS  
 BITMAPFILEHEADER bfh; [@";\C_I  
 bfh.bfReserved1=bfh.bfReserved2=0; >f^&^28  
 bfh.bfType=((WORD)('M'<< 8)|'B'); nUQcoSY#  
 bfh.bfSize=54+size; &"._%S58V  
 bfh.bfOffBits=54; yH|ucN~k5S  
 CFile bf; WnLgpt2G  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ uwj/]#`  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 3Ym5SrKK  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); w^ui%9 &6H  
  bf.WriteHuge(lpData,size); 0Q;T <% U  
  bf.Close(); )*G3q/l1u6  
  nCount++; M`FsKK`  
 } [])M2_  
 GlobalFreePtr(lpData); }yLdU|'W  
 if(nCount==1) ;QR|v  
  m_Number.Format("%d picture captured.",nCount); prlnK  
 else 5u:+hB  
  m_Number.Format("%d pictures captured.",nCount); r4gkSwy  
  UpdateData(FALSE); 5dMIv<#T`  
} C N"V w  
Vt5%A}.VQ  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) j+*VP  
{ q5BJsw  
 if(pMsg -> message == WM_KEYDOWN) TIW6v4  
 { !Wvzum@5D  
  if(pMsg -> wParam == VK_ESCAPE) =gGK243  
   return TRUE; (u]ft]z,-B  
  if(pMsg -> wParam == VK_RETURN) * <x]gV  
   return TRUE; 6[69|&  
 } 394u']M  
 return CDialog::PreTranslateMessage(pMsg); A~ '2ki5$g  
} `kwyF27v]  
*na7/ysT<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) mppBc-#EYr  
{ nOkX:5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Q~,E K  
  SaveBmp(); ^Xt9AM]e  
  return FALSE; !.+iA=K{  
} !#rZ eDmw  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~`#.ZMO  
 CMenu pop; P;VR[d4e/  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); j~\\,fl=  
 CMenu*pMenu=pop.GetSubMenu(0); )P[B!  
 pMenu->SetDefaultItem(ID_EXITICON); T)3#U8sT  
 CPoint pt; MQQiQ 2  
 GetCursorPos(&pt); $B~a*zZ7  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); CUnZ}@?d  
 if(id==ID_EXITICON) RL~\/#  
  DeleteIcon(); #Jy+:|jJ  
 else if(id==ID_EXIT) /_*:  
  OnCancel(); q .tVNKy%  
 return FALSE; w6Dysg:  
} [^"e~  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); L0UAS'hf  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) -njxc{b  
 AddIcon(); vO]gj/SaT  
 return res; b[uTt'p}  
} Z B`!@/3X  
Kw(/#C:$  
void CCaptureDlg::AddIcon() S?r:=GS  
{ ]}ff*W  
 NOTIFYICONDATA data; b=F"  
 data.cbSize=sizeof(NOTIFYICONDATA); A!Ng@r  
 CString tip; vD:.1,72  
 tip.LoadString(IDS_ICONTIP); YCh!D dy  
 data.hIcon=GetIcon(0); 9`{Mq9J  
 data.hWnd=GetSafeHwnd(); YxS*im[%]  
 strcpy(data.szTip,tip); S^I38gJd  
 data.uCallbackMessage=IDM_SHELL; qI<*Cze  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; eY\tO"Hc  
 data.uID=98; /p<mD-:.M  
 Shell_NotifyIcon(NIM_ADD,&data); ^P"t "  
 ShowWindow(SW_HIDE); a+A/l  
 bTray=TRUE;  O5_[T43  
} np=m ~k  
? @h  
void CCaptureDlg::DeleteIcon() `gfK#0x#  
{ '(+l77G  
 NOTIFYICONDATA data; 36J)O-Ti  
 data.cbSize=sizeof(NOTIFYICONDATA); mrFMdpaHl%  
 data.hWnd=GetSafeHwnd(); K._1sOw'"Y  
 data.uID=98; ,{J2i#g<  
 Shell_NotifyIcon(NIM_DELETE,&data); _=U XNr8S  
 ShowWindow(SW_SHOW); EIEwrC  
 SetForegroundWindow(); {4}Sl^kn*  
 ShowWindow(SW_SHOWNORMAL); V *S|Qy!p  
 bTray=FALSE; @a%,0Wn  
} LMsbTF@E  
GS8,mQ8l*l  
void CCaptureDlg::OnChange() (niZN_qv  
{ 9^igzRn0  
 RegisterHotkey(); nqgfAQsE)  
} U!3nn#!yE  
?B@hCd)  
BOOL CCaptureDlg::RegisterHotkey() qbqJ1^!6R  
{ 8 Sl[&  
 UpdateData(); 0<nKB}9  
 UCHAR mask=0; YX^{lD1Jj  
 UCHAR key=0; q/Q^\HTk  
 if(m_bControl) tSYeZ~  
  mask|=4; wKk  
 if(m_bAlt) .IF dJ  
  mask|=2; A javV  
 if(m_bShift) 5:ir il  
  mask|=1; (ter+rTv  
  key=Key_Table[m_Key.GetCurSel()]; *$`r)pV%AK  
 if(bRegistered){ 168U-<  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); F b`V.  
  bRegistered=FALSE; oJ6 d:  
 } J)'6 z  
 cMask=mask; tE>3.0U0Q  
 cKey=key; 2q2wo&uK  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); .?AtW:<*I  
 return bRegistered; ?xN8 HG4  
} 9 *]Z  
YH<@->Ip  
  四、小结 `q$DNOrS  
f8[2$i*cL  
  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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