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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: ' }G! D  
  _0~WT  
  一、实现方法 [(Z sQK  
T=/GFg'  
  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: zh5$$*\  
J^}w,r *=  
#pragma data_seg("shareddata") |'w_5?|4  
HHOOK hHook =NULL; //钩子句柄 K4]42#  
UINT nHookCount =0; //挂接的程序数目 Rgb1B3gu  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 {`2R<O  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Y<~N x~w{  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey X6+2~'*t  
static int KeyCount =0; I%.96V  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ~hubh!d=  
#pragma data_seg() OQ[E-%v1 R  
t7A '  
  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。 3~zK :(  
~]+-<O^U~  
  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: }LXS!Ff:  
3=6`'PKRQ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR I) mP ?  
cKey,UCHAR cMask) N|Cx";,|FZ  
{ <AZ21"oR/  
 BOOL bAdded=FALSE; G#V}9l8 Q  
 for(int index=0;index<MAX_KEY;index++){ 64qm  
  if(hCallWnd[index]==0){ W/z\j/Rgc  
   hCallWnd[index]=hWnd; ?\_N*NEtK  
   HotKey[index]=cKey; 'ZyHp=RN)  
   HotKeyMask[index]=cMask; q4].C|7   
   bAdded=TRUE; tTWeOAF  
   KeyCount++; ,XD'f  
   break; 0((3q'[ <  
  } U}H2!et&,)  
 } mI55vNyer  
 return bAdded; ?{bF3Mz=  
} ( K5w0  
//删除热键 @]*b$6tt  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) v&BKl  
{ gv&%2e}_  
 BOOL bRemoved=FALSE; nZ;h&N -_-  
 for(int index=0;index<MAX_KEY;index++){ pEUbP,3M:  
  if(hCallWnd[index]==hWnd){ .'3&!#3  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ JNQiCK,)}M  
    hCallWnd[index]=NULL; l `D>h2]  
    HotKey[index]=0; [kdt]+'+  
    HotKeyMask[index]=0; F-!,U)  
    bRemoved=TRUE; 7qfo%n"  
    KeyCount--; X!+#1NPM  
    break; 5O.dRp7d J  
   } $=>(7 =l_  
  } P4"Pb\o*  
 } B7:8%r/  
 return bRemoved; *gu4%  
} em^|E73  
j@4 yRl ^  
]Y#$!fIx  
  DLL中的钩子函数如下: Ri$wt.b  
Qo*,2B9R L  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) BMw_F)hTO  
{ sE*A,z?  
 BOOL bProcessed=FALSE; 6S-1Wc4  
 if(HC_ACTION==nCode) X#l]%IrW!  
 { T6s~f$G  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 8no_xFA  
   switch(wParam) F_8nxQ-  
   {  .#"O VI]#  
    case VK_MENU: &^ECQ  
     MaskBits&=~ALTBIT; X[L6Av  
     break; ISHNeO8  
    case VK_CONTROL: |ITSd%`3_  
     MaskBits&=~CTRLBIT; z^s40707x  
     break; }-3| v<d  
    case VK_SHIFT: mQRQ2SN6  
     MaskBits&=~SHIFTBIT; AJ'YkSg  
     break; R[eQ}7;+  
    default: //judge the key and send message Evd>s  
     break; L2s)B  
   } }}a<!L,{  
   for(int index=0;index<MAX_KEY;index++){ @\[UZVmBw  
    if(hCallWnd[index]==NULL) "%O,*t  
     continue; w(w%~;\kLP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d4"KM+EP?  
    { .@0i,7S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); D]+0X8@kH7  
     bProcessed=TRUE; kyQUaFG  
    } SvUC8y  
   } Am~ NBQ7  
  } zk+&5d 4(  
  else if((lParam&0xc000ffff)==1){ //有键按下 |*4)G6J@n  
   switch(wParam) P8DT2|Z6f]  
   { Pb0+ z=L  
    case VK_MENU: *ey<R  
     MaskBits|=ALTBIT; >n,RBl  
     break; 5#~ARk*?a  
    case VK_CONTROL: SB#YV   
     MaskBits|=CTRLBIT; 0- GA,I_  
     break; PV?XpT  
    case VK_SHIFT: :tP:X+?O  
     MaskBits|=SHIFTBIT; %N\pfZ2\  
     break; ebk{p <  
    default: //judge the key and send message ># FO0R  
     break; 8l|v#^v  
   } 7 4rmxjiN  
   for(int index=0;index<MAX_KEY;index++){ fM jn8.  
    if(hCallWnd[index]==NULL) S5eQHef  
     continue; zx7*Bnu0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L@*0wx`fU  
    { b*4[)Yg4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &I8,<(`  
     bProcessed=TRUE; ,|?-\?I  
    } 5.J$0wK'6  
   } <UJgl{ -  
  } ?}*A/-Hx0U  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 'T54k  
   for(int index=0;index<MAX_KEY;index++){ Y21,!$4gb  
    if(hCallWnd[index]==NULL) Q1qf'u  
     continue; 8Rq+eOP=S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) WeGT}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); MRvtuE|g  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 E.v~<[g  
   } Qh%(yL!  
  } }Sa2s&[<  
 } #pJ^w>YNy  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); AL/`Pqlk  
} 1nh2()QI[  
HjTK/x'_'L  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: /kLX f_  
n8"S;:Zm  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ba/Z<1)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H27J kZ&  
zuOx@T^  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ?'H);ou-p  
 /kGRN @  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) pyK|zvr-r  
{ ua(y! Im  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) &_ er_V~  
 { *JXiOs  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 8ID fYJ  
  SaveBmp(); 0*^)n&O  
  return FALSE; SJ1 1LF3)  
 } i70TJk$fs  
 …… //其它处理及默认处理 gvYib`#  
} {t: ZMUV  
C)> ])'S  
_5Q?]-M  
  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。 >8;Co]::kx  
2BOe,giy  
  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。 F,#)8>O  
Yo:l@(  
  二、编程步骤 8:,E=swe  
-A}*Aa'\  
  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"; 8XwAKN:f  
uV<I!jyI  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 2U,O e9  
G.K3'^_  
  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; <Gzy*1 Q&  
m`UNdFS  
  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; Z~o*$tF/  
k))*Sg  
  5、 添加代码,编译运行程序。 'j=7'aX>K  
TDg#O!DUF  
三、程序代码 }~dXz?{p8  
' >[KVvm  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Mn+;3qo{6  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) BDY@&vF  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ }x4,a6^  
#if _MSC_VER > 1000 ,J?Hdy:R  
#pragma once -}k'a{sj=  
#endif // _MSC_VER > 1000 Ee>P*7*jB  
#ifndef __AFXWIN_H__ h+|3\>/@9{  
#error include 'stdafx.h' before including this file for PCH DsY-JBDvoz  
#endif MGIpo[  
#include "resource.h" // main symbols TEOV>Tt  
class CHookApp : public CWinApp ~*D)L'`2M  
{ e!yUA!x`u  
 public: ?}sh@;]*h  
  CHookApp(); yG58?5\9  
  // Overrides #5O'XH5_  
  // ClassWizard generated virtual function overrides V%&t'H{  
  //{{AFX_VIRTUAL(CHookApp) -CW&!oW  
 public: :qy`!QPUm  
  virtual BOOL InitInstance(); k;:v~7VF  
  virtual int ExitInstance(); ~*-ar6  
  //}}AFX_VIRTUAL UwY<3ul  
  //{{AFX_MSG(CHookApp) L'4ob4r{L  
  // NOTE - the ClassWizard will add and remove member functions here. J=6 7As  
  // DO NOT EDIT what you see in these blocks of generated code ! /B"h #v-o  
  //}}AFX_MSG [@[!esC  
  DECLARE_MESSAGE_MAP() aR.1&3fE  
}; 9"R]"v3BA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); O!='U!X@P  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); xbrxh-gV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ay<'Z6`  
BOOL InitHotkey(); hNUAwTH6  
BOOL UnInit(); dz.]5R  
#endif iC&=-$vu  
HTI1eLZ2  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. c+AZ(6O ?\  
#include "stdafx.h" 1(M0C[P  
#include "hook.h" )'\Jp 7*3  
#include <windowsx.h> L7mN&Xr  
#ifdef _DEBUG qEKTSet?  
#define new DEBUG_NEW X"b4U\A  
#undef THIS_FILE 0Mt2Rg}  
static char THIS_FILE[] = __FILE__; B{!)GZ(}  
#endif NAhV8  
#define MAX_KEY 100 ed*Cx~rT  
#define CTRLBIT 0x04 joDnjz=  
#define ALTBIT 0x02 6cSMKbgZJ  
#define SHIFTBIT 0x01 zfL$z,zgf  
#pragma data_seg("shareddata") (,Yb]/O*  
HHOOK hHook =NULL; ws tI8">  
UINT nHookCount =0; I#@iA!  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey #(h~l> r  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT )eGGA6G  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey }GsZ)\!$4  
static int KeyCount =0; -h*Yd)  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift r9@O`i  
#pragma data_seg() dN;kYWRK  
HINSTANCE hins; NUb^!E"  
void VerifyWindow(); tx&>Eo  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) B{a:cz>0<  
//{{AFX_MSG_MAP(CHookApp) {f#{NA5  
// NOTE - the ClassWizard will add and remove mapping macros here. aGNVqS%y  
// DO NOT EDIT what you see in these blocks of generated code! ( gO?-0  
//}}AFX_MSG_MAP tC\x9&:  
END_MESSAGE_MAP() zB\g'F/  
SqFya  
CHookApp::CHookApp() wKum{X8  
{ 0t5>'GYX  
 // TODO: add construction code here, I*@\pc}  
 // Place all significant initialization in InitInstance HKq 2X4J$  
} @8Drhx  
7Upm  
CHookApp theApp; YS,kjL/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) v83uGEq(  
{ shxr^   
 BOOL bProcessed=FALSE; IGT~@);  
 if(HC_ACTION==nCode) .=rv,PWjZ  
 { a*CP1@O  
  if((lParam&0xc0000000)==0xc0000000){// Key up >h<eEv/  
   switch(wParam) f2_LfbvH  
   { 5}9-)\8=z  
    case VK_MENU: >OE.6)'Rm  
     MaskBits&=~ALTBIT; [Z,A quCU(  
     break; u_@%}zo?5*  
    case VK_CONTROL: yk#yrxM  
     MaskBits&=~CTRLBIT; qyUcjc%[  
     break; lf0/ 0KH  
    case VK_SHIFT: Vv' e,m  
     MaskBits&=~SHIFTBIT; mW1Sd#0  
     break; PTA;a 0A  
    default: //judge the key and send message "*laY<E  
     break; y 4,2Xs9,  
   } *)ed(+b  
   for(int index=0;index<MAX_KEY;index++){ J:f>/  
    if(hCallWnd[index]==NULL) hiaj!&+Q  
     continue; <,Sy:>:"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @iUzRsl  
    { 3`TC*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); vQ+}rHf`[  
     bProcessed=TRUE; qh0)~JL4   
    } &o^wgmS   
   } dpZ7eJ   
  } sxgR;gf6  
  else if((lParam&0xc000ffff)==1){ //Key down Jl Q%+$  
   switch(wParam) yr&oJYM  
   { yZK1bnYG|I  
    case VK_MENU: N ED`GU  
     MaskBits|=ALTBIT; #1hT#YN  
     break; , 9|%  
    case VK_CONTROL: qt/syF&s  
     MaskBits|=CTRLBIT; pPo?5s  
     break; rZu_"bcJ  
    case VK_SHIFT: x~s>  
     MaskBits|=SHIFTBIT; H; TmG<S  
     break; 90sMS]a  
    default: //judge the key and send message V==' 7n  
     break; Ms1G&NYP  
   } VT3Zo%Xx  
   for(int index=0;index<MAX_KEY;index++) Sx;zvc  
   { &-<"HW  
    if(hCallWnd[index]==NULL) wuzz Wq  
     continue; $@x3<}X;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aZ@4Z=LK  
    { 2@08 V|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `"AjbCL  
     bProcessed=TRUE; }S*6+4  
    } z$7YC49^  
   } +Jt"JJ>%k  
  } TzPx4L6?  
  if(!bProcessed){ j`,;J[Zd`h  
   for(int index=0;index<MAX_KEY;index++){ Q)#<T]~=  
    if(hCallWnd[index]==NULL) ;T#t)oV  
     continue; k%hD<_:p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) UgJlXB|a%2  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~(aq3ngo.  
   } 8S]Mf*~S'  
  } &M>S$+I n  
 } L!S-f4^5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); yel>-=Vn  
} d/Py,  
,EZ&n[%Ko  
BOOL InitHotkey() b cM#KA  
{ *Z{$0K  
 if(hHook!=NULL){ e"r}I!.  
  nHookCount++; /lr RbZ  
  return TRUE; ujz %0Mq;  
 } + W@r p#  
 else $nn~K  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); <g*rTqT'  
  if(hHook!=NULL) M|n)LyL  
   nHookCount++; ?b#?Vz  
  return (hHook!=NULL); 7IK<9i4O  
} ++&F5'?g  
BOOL UnInit() $)n{}8^  
{ ]2h[.qa  
 if(nHookCount>1){ ~%#?;hJ  
  nHookCount--; n:wn(BC3  
  return TRUE; T"QY@#E  
 } J3:P/n&  
 BOOL unhooked = UnhookWindowsHookEx(hHook); tH_# q"@)  
 if(unhooked==TRUE){ <(f4#B P  
  nHookCount=0; 4 T^M@+&|  
  hHook=NULL;  \W=  
 } GK&yP%Z3  
 return unhooked; So`xd *C!  
} +D h=D*  
I]k'0LG*^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {_q2kk  
{ 46XB6z01  
 BOOL bAdded=FALSE; T&R`s+7  
 for(int index=0;index<MAX_KEY;index++){ n|,Es!8:o  
  if(hCallWnd[index]==0){ MO _9Yi  
   hCallWnd[index]=hWnd; $35Oyd3s<  
   HotKey[index]=cKey; e. [+xOu`  
   HotKeyMask[index]=cMask; aNq Vs|H  
   bAdded=TRUE; RLKO0 #  
   KeyCount++; J&3;6I &  
   break; 3M@>kIT8  
  } +uT=Wb \  
 } W/\7m\ B  
 return bAdded; 66|lQE&n  
} dHp6G^Y  
L1F){8[  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  vo::y"  
{ {#[a4@B0  
 BOOL bRemoved=FALSE; "Q/3]hc.  
 for(int index=0;index<MAX_KEY;index++){ =pk'a_P 8-  
  if(hCallWnd[index]==hWnd){ CC)9Ks\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ y.O? c &!  
    hCallWnd[index]=NULL; A%GJ|h,i  
    HotKey[index]=0; IcQ?^9%{  
    HotKeyMask[index]=0; Z(<ul<?r  
    bRemoved=TRUE; piId5Gx7  
    KeyCount--; 7Ru0>4B  
    break; ,7QnZ=F  
   } ]-}a{z  
  } bTiw?i+6Dv  
 } <5X@r#Lz  
 return bRemoved; #zy%B  
} 0)P18n"$  
C$tSsw?A  
void VerifyWindow() ':>B %k  
{ hCDI;'ls  
 for(int i=0;i<MAX_KEY;i++){ YLCwo]\+>  
  if(hCallWnd!=NULL){ a6]!4  
   if(!IsWindow(hCallWnd)){ sW]n~kTt'  
    hCallWnd=NULL; N!m%~},s//  
    HotKey=0; V`H#|8\i  
    HotKeyMask=0; {$EXI]f  
    KeyCount--; I}q-J~s  
   } G` 8j ^H,  
  } r]E$uq bR  
 } c3}}cFe  
} )a}5\V  
)R|7> 97  
BOOL CHookApp::InitInstance() a>kD G <.A  
{ i]YQq!B  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); n-=\n6"P  
 hins=AfxGetInstanceHandle(); zJsoenU  
 InitHotkey(); /F4:1 }  
 return CWinApp::InitInstance(); >u4e:/5]  
} l~=iUZW<  
:rj78_e9  
int CHookApp::ExitInstance() 7'8O*EoB'  
{ -m @s 9k  
 VerifyWindow(); O<E0L&4-&  
 UnInit(); x)?\g{JH  
 return CWinApp::ExitInstance(); $e_ps~{7$  
} Wp]EaYt2D  
g|zK%tR_P  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file c[YjGx  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) zm"\D vN)  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ J{Ay(  
#if _MSC_VER > 1000 7 dzE"m  
#pragma once \%C[l  
#endif // _MSC_VER > 1000 yjr@v!o  
m3WV<Cbz  
class CCaptureDlg : public CDialog w\mF2h  
{ N<{ `n;  
 // Construction 9s!/yiP5  
 public: 4sAshrUf  
  BOOL bTray; |")x1' M  
  BOOL bRegistered; `u}x:f !  
  BOOL RegisterHotkey();  #.><A8J  
  UCHAR cKey; t#q> U%!  
  UCHAR cMask; Ocb2XEF  
  void DeleteIcon(); "h2Ny#  
  void AddIcon(); |]q=D1/A  
  UINT nCount; saT9%?4-  
  void SaveBmp(); m7"f6zSo(  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor c`+ITNV  
  // Dialog Data "tR.'F[n4P  
  //{{AFX_DATA(CCaptureDlg) zb" hy"hKw  
  enum { IDD = IDD_CAPTURE_DIALOG }; Qx6/Qa S?  
  CComboBox m_Key; {eXYl[7n  
  BOOL m_bControl; J v#^GNm  
  BOOL m_bAlt; Lm?*p>\Q  
  BOOL m_bShift; G4}q*&:k  
  CString m_Path; wgyO%  
  CString m_Number; X2`>@GR/>  
  //}}AFX_DATA TH|hrL;:8  
  // ClassWizard generated virtual function overrides e !yw"Cf*  
  //{{AFX_VIRTUAL(CCaptureDlg) [1*/lt|+p  
 public: </X"*G't  
  virtual BOOL PreTranslateMessage(MSG* pMsg); $imx-H`|  
 protected: c{Kl?0#[  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  (2li:1j  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); r83~o/T@  
  //}}AFX_VIRTUAL !7oy%{L  
  // Implementation {X$Mwqhpp;  
 protected:  SoX V  
  HICON m_hIcon; R u5&xIQ  
  // Generated message map functions X{ =[q|P  
  //{{AFX_MSG(CCaptureDlg) Ic}ofBK  
  virtual BOOL OnInitDialog();  ~Hs{(7   
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); dO[4}FZ$  
  afx_msg void OnPaint(); gp)ds^  
  afx_msg HCURSOR OnQueryDragIcon(); _p&$X  
  virtual void OnCancel(); ;N\?]{ L  
  afx_msg void OnAbout(); S:YL<_oI|  
  afx_msg void OnBrowse(); j 7 URg>i0  
  afx_msg void OnChange(); /6zpVkV  
 //}}AFX_MSG {wP|b@(1t  
 DECLARE_MESSAGE_MAP() hBhkb ~Oky  
}; "o 3"1s>d{  
#endif G C'%s  
IFxI>6<&  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >#?: x*[  
#include "stdafx.h" d*$<%J  
#include "Capture.h" L_mqC(vn  
#include "CaptureDlg.h" G 7]wg>*  
#include <windowsx.h> kDq%Y[6Z  
#pragma comment(lib,"hook.lib") 3(+#^aw  
#ifdef _DEBUG r%pFq1/'!  
#define new DEBUG_NEW 6t:c]G'J  
#undef THIS_FILE 'I]"=O,  
static char THIS_FILE[] = __FILE__; ^kvH/Y&  
#endif Mj B[5:s  
#define IDM_SHELL WM_USER+1 "6yiQ\`J  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Td*Oljj._U  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); XL^N5  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3 \r@f_p  
class CAboutDlg : public CDialog <y!r~?  
{ Fz&ilB  
 public: 0@lC5-=  
  CAboutDlg(); &|}IBu:T  
  // Dialog Data L_"(A #H:  
  //{{AFX_DATA(CAboutDlg) T''+zk  
  enum { IDD = IDD_ABOUTBOX }; q-%KfZ@(|  
  //}}AFX_DATA Ki/5xK=s  
  // ClassWizard generated virtual function overrides Xp6*Y1Y  
  //{{AFX_VIRTUAL(CAboutDlg) c)MR+'d\WO  
 protected: ]Cn*C{  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r)(BT:2m  
  //}}AFX_VIRTUAL X'7S|J6s  
  // Implementation jHH  
 protected:  IB{ZE/   
  //{{AFX_MSG(CAboutDlg) WV1 Z  
  //}}AFX_MSG |HG b.^f?  
  DECLARE_MESSAGE_MAP() Us,[x Q  
}; JjLyV`DJ  
_F@p53WE  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) "jO3Y/>S  
{ @O}j:b  
 //{{AFX_DATA_INIT(CAboutDlg) sLdUrD%  
 //}}AFX_DATA_INIT o?K|[gNi  
} 6bKO;^0  
DhNo +"!z  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Sn2Ds)Pfx3  
{ qMES<UL>  
 CDialog::DoDataExchange(pDX); gH^$Y~Lx  
 //{{AFX_DATA_MAP(CAboutDlg) xg,]M/J  
 //}}AFX_DATA_MAP NK9WrUj)  
} =8p+-8M[d  
ASZ5;N4u  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) <nTmZ-;  
 //{{AFX_MSG_MAP(CAboutDlg) ef}E.Bl  
 // No message handlers 3 9{"T0  
 //}}AFX_MSG_MAP eM=)>zl  
END_MESSAGE_MAP() '0')6zW5s  
*rcuhw"^b#  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) S"TMsi  
: CDialog(CCaptureDlg::IDD, pParent)  OI_/7@L  
{ ESxC{ "  
 //{{AFX_DATA_INIT(CCaptureDlg) /~l/_Jct@G  
  m_bControl = FALSE; }&T<wm!  
  m_bAlt = FALSE; Of7) A  
  m_bShift = FALSE; I49l2>  
  m_Path = _T("c:\\"); {L4>2rF  
  m_Number = _T("0 picture captured."); ix7 e] )m(  
  nCount=0; ]9&q'7*L  
  bRegistered=FALSE; `3y!XET  
  bTray=FALSE; (_qBsng:  
 //}}AFX_DATA_INIT gSr}p$N  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 uxC   
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); S2ppKlVv  
} =HV-8C]  
bI]UO)  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) \As oeeF  
{ HS6Imi  
 CDialog::DoDataExchange(pDX); NnLhJPh  
 //{{AFX_DATA_MAP(CCaptureDlg) 2Cd --W+=  
  DDX_Control(pDX, IDC_KEY, m_Key); 6"Lsui??  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ~26s7S}  
  DDX_Check(pDX, IDC_ALT, m_bAlt); %rDmW?T  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); '+!S|U,{  
  DDX_Text(pDX, IDC_PATH, m_Path); oIvnF:c  
  DDX_Text(pDX, IDC_NUMBER, m_Number); lii ]4k+z  
 //}}AFX_DATA_MAP x1:Pj  
} 52MCUl  
r($_>TS&"  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) `@$"L/AJ  
//{{AFX_MSG_MAP(CCaptureDlg) Naf`hE9  
 ON_WM_SYSCOMMAND() oBj>9I;  
 ON_WM_PAINT() NB+$ym  
 ON_WM_QUERYDRAGICON() 5G'&9{oB  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 9U7Mu;4  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) YR|(;B  
 ON_BN_CLICKED(ID_CHANGE, OnChange) c. TB8Ol  
//}}AFX_MSG_MAP /;<e.  
END_MESSAGE_MAP() _7=pw5[  
iVKbGgA  
BOOL CCaptureDlg::OnInitDialog() QypiF*fSU  
{ *{.&R9#7U'  
 CDialog::OnInitDialog(); s0)qlm*  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _)#=>$k\  
 ASSERT(IDM_ABOUTBOX < 0xF000); O,=Q1*c,&  
 CMenu* pSysMenu = GetSystemMenu(FALSE); =tS[&6/  
 if (pSysMenu != NULL) TDl!qp @  
 { !#c[~erNZ  
  CString strAboutMenu; yL ;o{ G  
  strAboutMenu.LoadString(IDS_ABOUTBOX); V5yxQb  
  if (!strAboutMenu.IsEmpty()) vfJ3idvo*w  
  { oDW<e'Jm  
   pSysMenu->AppendMenu(MF_SEPARATOR); I(^jOgYU  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); d4p{5F7]^  
  } EtR@sJ<  
 } })zB".  
 SetIcon(m_hIcon, TRUE); // Set big icon K=m9H=IX~T  
 SetIcon(m_hIcon, FALSE); // Set small icon q!hy;K`Jd  
 m_Key.SetCurSel(0); ''(fH$pY  
 RegisterHotkey(); v?YdLR  
 CMenu* pMenu=GetSystemMenu(FALSE); $kkp*3{ot  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); |D;"D  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ZSF=  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); hy$MV3LP  
 return TRUE; // return TRUE unless you set the focus to a control z;bH<cQ  
} ~'^!udF-  
l&6U|q`  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `R=a@DQ  
{ {DEzuU  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ZL-uwI!`D  
 { t<!+b@l5  
  CAboutDlg dlgAbout; YQ8j  
  dlgAbout.DoModal(); P\22op_te-  
 } +}c|O+6g  
 else CJMaltPp&  
 { W(uP`M%][0  
  CDialog::OnSysCommand(nID, lParam); QJM-`(  
 } $[M} K  
} jiA5oX^g  
U`bC>sCp  
void CCaptureDlg::OnPaint() _W@,@hOH  
{ fa!3/X+  
 if (IsIconic()) lFp!XZ!  
 { f MY;  
  CPaintDC dc(this); // device context for painting ).0V%}>  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); *? K4!q'  
  // Center icon in client rectangle /S7+B ]  
  int cxIcon = GetSystemMetrics(SM_CXICON); ]z-']R;  
  int cyIcon = GetSystemMetrics(SM_CYICON); %_B:EMPd  
  CRect rect; , @%C8Z  
  GetClientRect(&rect); -H1"OJ2aF  
  int x = (rect.Width() - cxIcon + 1) / 2; &YT_#M  
  int y = (rect.Height() - cyIcon + 1) / 2; ?ID* /u|X  
  // Draw the icon v!<PDw2'  
  dc.DrawIcon(x, y, m_hIcon); hmK8j l<6  
 } j+_S$T8w  
 else \6`v.B&v  
 { 2 ) TG  
  CDialog::OnPaint(); $ZQl IJZ  
 } 6 QN1+MwB  
} GB&Nt{  
4R& *&GZ#  
HCURSOR CCaptureDlg::OnQueryDragIcon() l `fW{lh  
{ 8A2if 9E3  
 return (HCURSOR) m_hIcon; w1wXTt  
} k~0#'I9  
_MM   
void CCaptureDlg::OnCancel() PHQ{-b?4t  
{ $.oOG"u0]  
 if(bTray) !Oeq G  
  DeleteIcon(); La`h$=#`  
  CDialog::OnCancel(); wzD\8_;6N  
} 2}^+ ]5  
JQ*D   
void CCaptureDlg::OnAbout() GN\8![J  
{ wl7 MfyU  
 CAboutDlg dlg; g~~m' ^  
 dlg.DoModal(); N=>- Q)  
} Q,zC_  
84iJ[Fq{  
void CCaptureDlg::OnBrowse() yJnPD/i  
{ B }6Kd  
 CString str; ~_ *H)|  
 BROWSEINFO bi; 9aTL22U?  
 char name[MAX_PATH]; OI~}e,[2z  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ]}BB/KQy^  
 bi.hwndOwner=GetSafeHwnd(); Cf Qf7-  
 bi.pszDisplayName=name; y7CWBTH0>  
 bi.lpszTitle="Select folder"; 5B}3GBA  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ( FM4 ^#6  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); @q,)fBZq  
 if(idl==NULL) 0;}Aj8Fle  
  return; M[A-1]'  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); q#;BhPc  
 str.ReleaseBuffer(); W&<g} N+  
 m_Path=str; -r!42`S  
 if(str.GetAt(str.GetLength()-1)!='\\') 5!<o-{J[(=  
  m_Path+="\\"; Was'A+GZ  
 UpdateData(FALSE); zCBplb  
} >W'j9+Va  
GOGt?iw*<  
void CCaptureDlg::SaveBmp() >&BrCu[u  
{ !~kEtC  
 CDC dc; ?RDO] I>  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Ru:n~77{  
 CBitmap bm; KL "Y!PN:  
 int Width=GetSystemMetrics(SM_CXSCREEN); 1:_=g#WH  
 int Height=GetSystemMetrics(SM_CYSCREEN); USprsaj  
 bm.CreateCompatibleBitmap(&dc,Width,Height); FS8S68  
 CDC tdc; j5zFDh1(  
 tdc.CreateCompatibleDC(&dc); Z)NrhJC  
 CBitmap*pOld=tdc.SelectObject(&bm); +i+tp8T+7  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); k,T_e6(  
 tdc.SelectObject(pOld); |H:<:*=6c  
 BITMAP btm; s,w YlVYf!  
 bm.GetBitmap(&btm); 9GThyY  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 0Su_#".-*  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 9X3yp:>V  
 BITMAPINFOHEADER bih; \4aKLr  
 bih.biBitCount=btm.bmBitsPixel; Y:wF5pp;  
 bih.biClrImportant=0; !#.\QU|  
 bih.biClrUsed=0; h77IWo6%  
 bih.biCompression=0; 9[kX/#~W*  
 bih.biHeight=btm.bmHeight; e|VJ9|;3  
 bih.biPlanes=1; w$b~x4y%  
 bih.biSize=sizeof(BITMAPINFOHEADER); 0F^]A"kF  
 bih.biSizeImage=size; aRX  
 bih.biWidth=btm.bmWidth; 82|q7*M*.  
 bih.biXPelsPerMeter=0; zwnw'  
 bih.biYPelsPerMeter=0; Oo kxg *!5  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Ss 2$n  
 static int filecount=0; Z9xR  
 CString name; ^1.7Juvb  
 name.Format("pict%04d.bmp",filecount++); $:e)$Xnn-  
 name=m_Path+name; ?s%v 3T  
 BITMAPFILEHEADER bfh; s{ =5-:  
 bfh.bfReserved1=bfh.bfReserved2=0; +lKrj\Xj  
 bfh.bfType=((WORD)('M'<< 8)|'B'); +5-]iKh  
 bfh.bfSize=54+size; XoJgs$3B  
 bfh.bfOffBits=54; :Dayv6g  
 CFile bf; Ih()/(  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Yq J]7V\  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [.a;L">  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); R>*g\}9Zh3  
  bf.WriteHuge(lpData,size); & N;pH  
  bf.Close(); V/+Jc( N  
  nCount++; Evkt_vvf  
 } PRwu  
 GlobalFreePtr(lpData); Q3,=~}ZNK  
 if(nCount==1) 8[M* x3  
  m_Number.Format("%d picture captured.",nCount); tn{8u7  
 else }'TTtV:Q  
  m_Number.Format("%d pictures captured.",nCount); Jh?z=JY  
  UpdateData(FALSE); |YRY!V_w  
} 2A>C+Y[7\  
y^G>{?Tha  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) o!utZmk$  
{ PPj[;(A  
 if(pMsg -> message == WM_KEYDOWN) xZyeX34{M;  
 { /$Z m~Mp  
  if(pMsg -> wParam == VK_ESCAPE) |Ytg  
   return TRUE; 6b<+8w  
  if(pMsg -> wParam == VK_RETURN) C3)|<E  
   return TRUE; 5DOE3T`^Oc  
 } xg} ug[  
 return CDialog::PreTranslateMessage(pMsg); "5}%"-#  
} +2Ql~w@$^l  
/W`$yM3  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5%P[^}  
{ E=k w)<X2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ )v1CC..  
  SaveBmp(); 's.~$  
  return FALSE; \TUE<<?1s  
} %[ /<+  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ f>z`i\1oO  
 CMenu pop; ~:EW>Fq%i  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ^df x~C  
 CMenu*pMenu=pop.GetSubMenu(0); G?/c/rG  
 pMenu->SetDefaultItem(ID_EXITICON); 4uUs7T  
 CPoint pt; ~ezCu_  
 GetCursorPos(&pt); qm'b'!gq~  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); sT`^ljp4  
 if(id==ID_EXITICON) &K *X)DAs  
  DeleteIcon(); SX+4 HJB  
 else if(id==ID_EXIT) %$TEDr!  
  OnCancel(); #Qd' + M  
 return FALSE; ` 8UWE {  
} x@m<Ym-  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); j{;|g%5t  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ) * TF"  
 AddIcon(); 9U^$.Lb  
 return res; QrC/ssf}  
} k_?~<vTM  
Hbk&6kS  
void CCaptureDlg::AddIcon() ;'HF'Z  
{ XsUUJuCG  
 NOTIFYICONDATA data; /.P9MSz0G  
 data.cbSize=sizeof(NOTIFYICONDATA); x2k*| =$  
 CString tip; BS7J#8cu  
 tip.LoadString(IDS_ICONTIP); <uD qYT$6  
 data.hIcon=GetIcon(0); aD ESr?  
 data.hWnd=GetSafeHwnd(); .oR3Q/|k]  
 strcpy(data.szTip,tip); [N:BM% FQ  
 data.uCallbackMessage=IDM_SHELL; 6Y7H|>g)  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <GF@L  
 data.uID=98; #6W,6(#^#  
 Shell_NotifyIcon(NIM_ADD,&data); sx5r(0Z  
 ShowWindow(SW_HIDE); SY1GR n  
 bTray=TRUE; 0^#DNq*NQ  
} p7C!G1+z  
>vujZw_0>  
void CCaptureDlg::DeleteIcon() jK3\K/ob(  
{ /\J|Uj  
 NOTIFYICONDATA data; *vnXlV4L  
 data.cbSize=sizeof(NOTIFYICONDATA); xmr|'}Pt[  
 data.hWnd=GetSafeHwnd(); p)3nyN=|_  
 data.uID=98; :c7CiP  
 Shell_NotifyIcon(NIM_DELETE,&data); ?2ItB`<(  
 ShowWindow(SW_SHOW); ntGq" o  
 SetForegroundWindow(); })[($$f/  
 ShowWindow(SW_SHOWNORMAL); P^[/Qi}j  
 bTray=FALSE;  AmcC:5  
} Q\9K2=4  
wqy ^8N[K]  
void CCaptureDlg::OnChange() %{C)1*M7  
{ >SDp uG&>  
 RegisterHotkey(); _ 08];M|  
} 2a `J%A  
l>&sIX  
BOOL CCaptureDlg::RegisterHotkey() ~Ltr.ci  
{ nbmc[!PwG  
 UpdateData(); tZA:  
 UCHAR mask=0; B4yh3cf  
 UCHAR key=0; N:x0w+Ca  
 if(m_bControl) EGS%C%>l/o  
  mask|=4; = .`jjDJ  
 if(m_bAlt) J`oTes,  
  mask|=2; v <Hb-~  
 if(m_bShift) z[9UQU~x?  
  mask|=1; I:$"E% >=  
  key=Key_Table[m_Key.GetCurSel()]; r,xmEj0E  
 if(bRegistered){ E>pVn2|  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); fbC~WV#  
  bRegistered=FALSE; M35Ax],:^  
 } Bo r7]#  
 cMask=mask; ^$Krub{|  
 cKey=key; ssl&5AS  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 8h.V4/?  
 return bRegistered; oT&m4I  
} gyu6YD8L  
%fhNxR  
  四、小结 !/hsJ9  
2P9J' L  
  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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