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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: {5+ 39=(  
  2<d'!cm  
  一、实现方法 >xXq:4l>}  
K1o&(;l8G  
  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: "5<YN#  
:zpT Gk8Z  
#pragma data_seg("shareddata") M" $g*j  
HHOOK hHook =NULL; //钩子句柄 IU"8.(;o  
UINT nHookCount =0; //挂接的程序数目 LCb0Kq}*/(  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码  }s8xr>  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 R?J8#JPXD  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey {@PZlQg  
static int KeyCount =0; Ij9=J1c4  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 v7D0E[)~  
#pragma data_seg() VS65SxHA  
BU|m{YZ$  
  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。 /)4Q%Zp  
{&FOa'bP  
  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: @2>ce2+  
]#rN z"  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ^Gi WU +`  
cKey,UCHAR cMask) 6}*4co  
{ fS%B/h=  
 BOOL bAdded=FALSE; "Q{7X[$$^  
 for(int index=0;index<MAX_KEY;index++){ u=0161g  
  if(hCallWnd[index]==0){ ~$1g"jIw  
   hCallWnd[index]=hWnd; ]UZP dw1D  
   HotKey[index]=cKey; ghk"XJ|  
   HotKeyMask[index]=cMask; }$ a *XY1  
   bAdded=TRUE; r/QI-Cf&  
   KeyCount++; I}awembw g  
   break; u5`b")a  
  } T ^/\Rr  
 } "J `#  
 return bAdded; BiZYGq  
} tw] l  
//删除热键 Ia:M+20n  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <W*6=HZ'  
{ C k/DV  
 BOOL bRemoved=FALSE; WJ\,Y} J  
 for(int index=0;index<MAX_KEY;index++){ 52r\Q}v$  
  if(hCallWnd[index]==hWnd){ j ~I_by  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ C]3^:b+   
    hCallWnd[index]=NULL; 5{-54mwo  
    HotKey[index]=0; &0+Ba[Z ^  
    HotKeyMask[index]=0; gGs"i]c  
    bRemoved=TRUE; ifmX<'(9A  
    KeyCount--; *#GX~3A  
    break; H8E#r*"-m  
   } q{!ft9|K\d  
  } ?` 2z8uD/  
 } 7b R[.|T  
 return bRemoved; i3>_E <"9  
} >=3oe.$)  
w; :{  
+77j2W_0  
  DLL中的钩子函数如下: :2~2j-m  
#6#%y~N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 2=| Ks]<P  
{ Jb)xzUhES  
 BOOL bProcessed=FALSE; mw83pU6  
 if(HC_ACTION==nCode) '"6*C*XS  
 { 8]4W@~c  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 xk^`4;  
   switch(wParam) /8/N  
   {  ]Bz.6OR  
    case VK_MENU: Z/OERO   
     MaskBits&=~ALTBIT; V\AF%=6}  
     break; Z0M|Bv9_  
    case VK_CONTROL: fyq %-Tj  
     MaskBits&=~CTRLBIT; .RbPO#(  
     break; ;r XZ?"  
    case VK_SHIFT: uzS;&-nA  
     MaskBits&=~SHIFTBIT; _iu^VK,}  
     break; k?Njge6@  
    default: //judge the key and send message C`8.8  
     break; jTqE V(  
   } ) LohB,?  
   for(int index=0;index<MAX_KEY;index++){ (7X^z&2  
    if(hCallWnd[index]==NULL) j<h0`v  
     continue; 1.nYT*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +t(Gt0+  
    { !{A#\~,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Jn20^YG  
     bProcessed=TRUE; 3+! G9T!  
    } 0u I=8j  
   } /@",5U#  
  } ~le:4qaX  
  else if((lParam&0xc000ffff)==1){ //有键按下 880T'5}S :  
   switch(wParam) %~N| RSec  
   { \M*c3\&~,e  
    case VK_MENU: gi8f)MNP?~  
     MaskBits|=ALTBIT; f;b f R&v  
     break; Z|d+1i  
    case VK_CONTROL: #_:%Y d  
     MaskBits|=CTRLBIT; A!a.,{fZ  
     break; Xzqx8Kd  
    case VK_SHIFT: +,eF(VS!  
     MaskBits|=SHIFTBIT; 8P} a  
     break; T t$] [  
    default: //judge the key and send message gc W'  
     break; YOY2K%o  
   } ^,Ft7JAn  
   for(int index=0;index<MAX_KEY;index++){ :7s2M  
    if(hCallWnd[index]==NULL) B06W(y,3Q>  
     continue; 1:q`KkJx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) nDz.61$[  
    { , ksr%gR+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9ol&p>  
     bProcessed=TRUE; 9]g`VD6 <v  
    } 6N/6WrQEeg  
   } 6vg` 8  
  } <Q_E3lQy/  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 tl=e!  
   for(int index=0;index<MAX_KEY;index++){ D+Z2y1  
    if(hCallWnd[index]==NULL) $qiM_06  
     continue; *^ua2s.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 2 yRUw  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ixB"6O  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 'lOpoWDL  
   } c']m5q39'  
  } IJLuu@kRm,  
 } H4W!@"e  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <#)Q.P  
} g!`^!Q/($  
sLc,Dx"+  
  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: N <M6~  
 bDq<]h_7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); xr31< 4B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); WFvVu3  
".kH5(:  
  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: WA#y&  
zuJ@@\75  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) m=60a@o]  
{ g2YE^EKU~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 4UMOC_  
 { z7&m,:M  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 =RHIB1  
  SaveBmp(); l(8@?t^;  
  return FALSE; #d$lN}8  
 } r>6FJ:Tx  
 …… //其它处理及默认处理 9dva]$^:*1  
} }eSrJgF4M  
&3\3wcZ,q  
~eXI}KhBw6  
  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。 $?DEO[p.  
,2mq}u>WU  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 m1RjD$fM  
q<cxmo0S  
  二、编程步骤 >oapw5~5  
<Kk?BRxi  
  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"; Xc<Hm  
hwSxdT6  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ?2K~']\S  
l=<},_]{  
  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&e?3qKX(  
|W5lhx0U  
  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; Tz7|OV_W$  
"71Y{WQ   
  5、 添加代码,编译运行程序。 EnEaUb?P  
RP9~n)h~b  
三、程序代码 *`t3z-L  
)qRE['M  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL !z]{zM%  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) %]o/p_<  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ &jh17y  
#if _MSC_VER > 1000 Nh^q&[?  
#pragma once 4XSq\.@G  
#endif // _MSC_VER > 1000 eRg;)[#0>$  
#ifndef __AFXWIN_H__ >j&k:  
#error include 'stdafx.h' before including this file for PCH Mz;KXP  
#endif *~d<]U5h  
#include "resource.h" // main symbols m>!aI?g  
class CHookApp : public CWinApp b:$q5  
{ so A] f  
 public: zG<>-?q~'  
  CHookApp(); b6@0?_n  
  // Overrides %z-n2%  
  // ClassWizard generated virtual function overrides w=[ITQ|W%  
  //{{AFX_VIRTUAL(CHookApp) {&nDm$KTD  
 public: QM{B(zH  
  virtual BOOL InitInstance(); (w Q,($@  
  virtual int ExitInstance(); ^j2z\yo  
  //}}AFX_VIRTUAL H:mcex  
  //{{AFX_MSG(CHookApp) Li\b ,_C  
  // NOTE - the ClassWizard will add and remove member functions here. jOL=vG  
  // DO NOT EDIT what you see in these blocks of generated code ! lN_b&92  
  //}}AFX_MSG \\Nt^j3qR  
  DECLARE_MESSAGE_MAP() 0RN7hpf&`  
}; J5}?<Dd:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Z*.rv t  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Q>TNzh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +#6f)H(P]  
BOOL InitHotkey(); R  xc  
BOOL UnInit(); G9CL}=lJ,  
#endif J!yK/*sO,  
M[L@ej  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 0<nW nD,z  
#include "stdafx.h" 5[P^O6'  
#include "hook.h" AH^'E  
#include <windowsx.h> 6df`]s c  
#ifdef _DEBUG a,e;(/#\7  
#define new DEBUG_NEW X|y0pH:S  
#undef THIS_FILE <SRo2rjRa  
static char THIS_FILE[] = __FILE__; @`aPr26>?  
#endif |pE ~  
#define MAX_KEY 100 X rut[)H  
#define CTRLBIT 0x04 . Fm| $x  
#define ALTBIT 0x02 x6Q_+!mnk  
#define SHIFTBIT 0x01 \psO$TxF=  
#pragma data_seg("shareddata") fF. +{-.  
HHOOK hHook =NULL; +B4i,]lCx  
UINT nHookCount =0; R[H#a v  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey J$ &2GAi  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT rWJKK  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 9/O\769"'  
static int KeyCount =0; m [BV{25  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \mw5 ~Rf;  
#pragma data_seg() >dwY( a  
HINSTANCE hins; Hh%|}*f_,  
void VerifyWindow(); 'i 8`LPQ  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) #2%8@?_-M  
//{{AFX_MSG_MAP(CHookApp) *\^(-p~M  
// NOTE - the ClassWizard will add and remove mapping macros here. pK)!o  
// DO NOT EDIT what you see in these blocks of generated code! q[c^`5  
//}}AFX_MSG_MAP F`o"t]AD-a  
END_MESSAGE_MAP() unyU|B  
\3 O1o#=(  
CHookApp::CHookApp() y~ wN:  
{ yg"FF:^T  
 // TODO: add construction code here, Q>uJ:[x+  
 // Place all significant initialization in InitInstance R)%I9M,  
} ~_ko$(;A  
1z@{ 4)  
CHookApp theApp; S*H @`Do%d  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \_/dfmlIZ  
{ MFqb_q+  
 BOOL bProcessed=FALSE; P} Y .  
 if(HC_ACTION==nCode) "}:SXAZ5`  
 { :PB W=W  
  if((lParam&0xc0000000)==0xc0000000){// Key up m2Wi "X(I_  
   switch(wParam) J?f7!F:8  
   { :v^OdW  
    case VK_MENU: ` bZgw  
     MaskBits&=~ALTBIT; ^C;ULUn3  
     break; |43Oc:Ah+  
    case VK_CONTROL: 'NDr$Qc3  
     MaskBits&=~CTRLBIT;  r^,"OM]  
     break; #}[NleTVt  
    case VK_SHIFT: U+ V yH4"  
     MaskBits&=~SHIFTBIT; y.::d9v  
     break; `=2p6<#z  
    default: //judge the key and send message l^rQo_alk  
     break; D~ 7W  
   } FMC]KXSd  
   for(int index=0;index<MAX_KEY;index++){ {G{ >Qa|  
    if(hCallWnd[index]==NULL) ] m #*4  
     continue; v+'*.Iv:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {%6g6?=j  
    { ,j eC7-tX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); <,Jx3y q  
     bProcessed=TRUE; 24 RD  
    } 5]2 p>%G  
   } Gl9 ,!"A  
  } eU\_m5xl"  
  else if((lParam&0xc000ffff)==1){ //Key down &PFK0tY  
   switch(wParam) _[N*k"  
   { Y$W)JWMY`  
    case VK_MENU: [!`5kI  
     MaskBits|=ALTBIT; )-\qo#0l  
     break; -K6y#O@@  
    case VK_CONTROL: kk}_AZ0eK  
     MaskBits|=CTRLBIT; A1B%<$|pz  
     break; E|_}?>{R  
    case VK_SHIFT: k!d<2Qp W  
     MaskBits|=SHIFTBIT; `{Fz  
     break; igF<].'V  
    default: //judge the key and send message 2FR 5RG oD  
     break; gN[^ ,u  
   } ^O&&QRH~w  
   for(int index=0;index<MAX_KEY;index++) ~ F>'+9?Sn  
   { =|H.r9-PK6  
    if(hCallWnd[index]==NULL) }w{E<C(M  
     continue; x}#N?d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2g;Id.i>  
    { i>(TPj|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); G}@a]EGm  
     bProcessed=TRUE; )g`~,3G  
    } t<e3EW@>>  
   } &@'+h* b  
  } 6u{%jSA>D\  
  if(!bProcessed){ ]6,D 9^{;  
   for(int index=0;index<MAX_KEY;index++){ ;dTxQ_:  
    if(hCallWnd[index]==NULL) mcxD#+H 3  
     continue; )QI#szv6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7nZ3u _~  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Nwk^r75lq  
   } \Npvm49  
  } >".@;  
 } -cP1,>Ahv  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 0+AMN-  
} _!9I f  
Op hD_^  
BOOL InitHotkey() -:Bgp*S  
{ 9rT"_d#  
 if(hHook!=NULL){ A| y U'k  
  nHookCount++; \ !IEZ  
  return TRUE; P[jh^!<j  
 } lz _ r  
 else c-4z8T#M^  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); q&^H" fF  
  if(hHook!=NULL) 6Ia[`x uL  
   nHookCount++; kR{$&cE^  
  return (hHook!=NULL); CW+gZ!  
} uFFC.w  
BOOL UnInit() `)Y 5L}c=  
{ chM-YuN|  
 if(nHookCount>1){ {d> 6*b  
  nHookCount--; cvYKZB  
  return TRUE; :c(#03w*C  
 } l0tFj>q"  
 BOOL unhooked = UnhookWindowsHookEx(hHook); l)V646-O,~  
 if(unhooked==TRUE){ XY<KLO%  
  nHookCount=0; LdnTdh?  
  hHook=NULL; @@=,bO  
 } TW=N+ye^1(  
 return unhooked; {,= hIXo>  
} _WI~b  
ZHCrKp  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A>\3FeU>UC  
{ (R(NEN  
 BOOL bAdded=FALSE; Bk5ft4v-  
 for(int index=0;index<MAX_KEY;index++){ i*mI-l  
  if(hCallWnd[index]==0){ Q+Eqaz`  
   hCallWnd[index]=hWnd; =nlj|S ~3  
   HotKey[index]=cKey; ^cuH\&&7  
   HotKeyMask[index]=cMask; /'^ BH A|h  
   bAdded=TRUE; "tu*(>'~5  
   KeyCount++; W!1 B~NH#  
   break; Ii>#9>!F  
  } S(0JBGC  
 } 7mL1$i6=  
 return bAdded; aj-:JTf  
} .GWN~iR(  
u@Bgyt7Y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) M{p9b E[j  
{ S(lqj6aa}  
 BOOL bRemoved=FALSE; ""h%RhcZ\  
 for(int index=0;index<MAX_KEY;index++){ qBZ;S3  
  if(hCallWnd[index]==hWnd){ LN9.Q'@r?  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ m; PTO$--  
    hCallWnd[index]=NULL; ^BP4l_rO9  
    HotKey[index]=0; 1+Vei<H$  
    HotKeyMask[index]=0; MPLeqk$;  
    bRemoved=TRUE; tZ:fOM  
    KeyCount--; ACF_;4%&  
    break; .:tR*Kst`7  
   } "WH &BhQYD  
  } wkT4R\H>  
 } [5Zi\'~UH)  
 return bRemoved;  nWUau:%  
} epcvwM/A  
P#"_H}qC*  
void VerifyWindow() T7N\b]?j@Y  
{ ,QLy }=N  
 for(int i=0;i<MAX_KEY;i++){ tR_DN  
  if(hCallWnd!=NULL){ Ad4-aWH  
   if(!IsWindow(hCallWnd)){ |WW'qg]Uu  
    hCallWnd=NULL; <f0yh"?6VH  
    HotKey=0; 6L2Wv5C  
    HotKeyMask=0; A[f `xE  
    KeyCount--; B0^:nYko  
   } w<Iq:3  
  } y tTppmJF  
 } U[:Js@uH_  
} Kc+9n%sp  
5"D\n B%  
BOOL CHookApp::InitInstance() Ah zV?6e  
{ f?"909&  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); fLV@~T|  
 hins=AfxGetInstanceHandle(); ][~rk?YY  
 InitHotkey(); GD!!xt  
 return CWinApp::InitInstance(); d!"gb,ec  
} ?l`|j*  
\*c=bz&l  
int CHookApp::ExitInstance() s*vtCdrE.  
{ .C1g Dry]  
 VerifyWindow(); pWKI^S  
 UnInit(); #?~G\Ux0/  
 return CWinApp::ExitInstance(); ,Uy~O(F t  
} Po.izE!C  
\]Rmq_O  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file oM,UQ!x <  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) p&HkR^.S  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ c32"$g  
#if _MSC_VER > 1000 bLUyZ3m!  
#pragma once <O{G&  
#endif // _MSC_VER > 1000 6lwWFR+k  
VGOdJ|2]Wr  
class CCaptureDlg : public CDialog 8,:lw3x1  
{ Gn<e&|4>i}  
 // Construction H)K.2Q  
 public: oB+@05m8  
  BOOL bTray; ]Y f8  
  BOOL bRegistered; mQ\oR|  
  BOOL RegisterHotkey(); TaZlfe5z  
  UCHAR cKey; r6 kQMFA  
  UCHAR cMask; N Q }5'  
  void DeleteIcon(); +sXnC\  
  void AddIcon(); 07Oagq(  
  UINT nCount; ]jV1/vJ-!  
  void SaveBmp(); u<HJFGLzI  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor [LSs|f  
  // Dialog Data qtp-w\#S$  
  //{{AFX_DATA(CCaptureDlg) '@#l/9  
  enum { IDD = IDD_CAPTURE_DIALOG }; oSP^ .BJ$  
  CComboBox m_Key; ~%sNPKjA  
  BOOL m_bControl; ] .c$(.  
  BOOL m_bAlt; qwo{34  
  BOOL m_bShift; ^0 /!:*?  
  CString m_Path; kqLpt  
  CString m_Number; [O6JVXO>  
  //}}AFX_DATA "mcuF]7F  
  // ClassWizard generated virtual function overrides _61tE  
  //{{AFX_VIRTUAL(CCaptureDlg) [V;Q#r&+  
 public: I5g!c|#y  
  virtual BOOL PreTranslateMessage(MSG* pMsg); M U2];  
 protected: --TY[b  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support NaeG)u#+  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); S?Uvt?  
  //}}AFX_VIRTUAL JwUz4  
  // Implementation #F+b^WTR  
 protected: !3o]mBH8  
  HICON m_hIcon; Y+3r{OI  
  // Generated message map functions wodff_l  
  //{{AFX_MSG(CCaptureDlg) 9RY}m7  
  virtual BOOL OnInitDialog(); `_M&zN  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); kk aS&r>  
  afx_msg void OnPaint(); ?gS~9jgcd  
  afx_msg HCURSOR OnQueryDragIcon(); u~27\oj,  
  virtual void OnCancel(); ~<=wTns!  
  afx_msg void OnAbout(); d C6t+  
  afx_msg void OnBrowse(); _\AT_Zmy  
  afx_msg void OnChange(); HE3x0H}o>  
 //}}AFX_MSG T2k# "zD  
 DECLARE_MESSAGE_MAP() ~Yl%{1  
}; \eS-wO7%  
#endif yzJTNLff  
0,m@BsK  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file RZI4N4o  
#include "stdafx.h" >\ PNKpn{  
#include "Capture.h" ;5=5HYx%  
#include "CaptureDlg.h" ['@R]Si"!  
#include <windowsx.h> C?PgC~y)  
#pragma comment(lib,"hook.lib") t8S,C4  
#ifdef _DEBUG gOn^}%4.I  
#define new DEBUG_NEW K$~Ja  
#undef THIS_FILE OyTp^W`&  
static char THIS_FILE[] = __FILE__; *AI?md  
#endif J ?H| "  
#define IDM_SHELL WM_USER+1 ziD+% -  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !T26#>mV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H,U qU3b3  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; O`='8'6zW\  
class CAboutDlg : public CDialog wTu=v  
{ __,}/|K2  
 public: #W=H)6  
  CAboutDlg(); 2]-xmS>|b  
  // Dialog Data "?Xb$V7  
  //{{AFX_DATA(CAboutDlg) Dq~D4|  
  enum { IDD = IDD_ABOUTBOX }; HiDL:14  
  //}}AFX_DATA -hpMd/F  
  // ClassWizard generated virtual function overrides d i#:KW  
  //{{AFX_VIRTUAL(CAboutDlg) kG]FB.@bG  
 protected: Ed&M  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -nC!kpo  
  //}}AFX_VIRTUAL p+|(lrYC  
  // Implementation 1N\-Ku  
 protected: FR1se  
  //{{AFX_MSG(CAboutDlg) >PK\bLEo  
  //}}AFX_MSG s4Y7x.-  
  DECLARE_MESSAGE_MAP() wU bLw  
}; gIaPS0Q  
nXcOFU  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 9mfP9  
{ IBe0?F #  
 //{{AFX_DATA_INIT(CAboutDlg) *[[TDduh&  
 //}}AFX_DATA_INIT lhhp6-r  
} rJ}k!}G  
\Dn an5H/  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Hze~oAP+  
{ m;"dLUb  
 CDialog::DoDataExchange(pDX); q<*UeyE S  
 //{{AFX_DATA_MAP(CAboutDlg) S) [$F}  
 //}}AFX_DATA_MAP \Z%V)ZRi=  
} } X[wWH  
#-Nc1+gu   
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) */yR _f  
 //{{AFX_MSG_MAP(CAboutDlg) $f]dL};  
 // No message handlers J`4{O:{4  
 //}}AFX_MSG_MAP U:o(%dk  
END_MESSAGE_MAP() A('_.J=  
Me e+bp  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) *ioVLt,:R  
: CDialog(CCaptureDlg::IDD, pParent) =jN9PzLk  
{ EzDQoN7Em  
 //{{AFX_DATA_INIT(CCaptureDlg) t)/:VImY  
  m_bControl = FALSE; 5Myp#!|x:  
  m_bAlt = FALSE; K<Qy1y~[  
  m_bShift = FALSE; Ue22,Pp6  
  m_Path = _T("c:\\"); 5U+a{oA  
  m_Number = _T("0 picture captured."); 4(FEfde=  
  nCount=0; )0W-S9e<  
  bRegistered=FALSE; 2gnmk TyF  
  bTray=FALSE; 0ynvn9@t  
 //}}AFX_DATA_INIT }yW*vy6`  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 nm597WeZp  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); '6&a8&:  
} )+S^{tt  
\P` mV9P  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) :>'4@{'   
{ \h}a?T6  
 CDialog::DoDataExchange(pDX); ^Gs=U[**  
 //{{AFX_DATA_MAP(CCaptureDlg) )m7 Yo  
  DDX_Control(pDX, IDC_KEY, m_Key); *3>$ f.QU  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); t$W~X~//  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Z7t-{s64  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); T@ecWRro  
  DDX_Text(pDX, IDC_PATH, m_Path); fq2t^c|$  
  DDX_Text(pDX, IDC_NUMBER, m_Number); _PR> <L_  
 //}}AFX_DATA_MAP [Q=NGHB1/  
} LT ZoO9O  
j>70AE3[8  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ^Q'^9M2)  
//{{AFX_MSG_MAP(CCaptureDlg) $stBB  
 ON_WM_SYSCOMMAND() UFox v)  
 ON_WM_PAINT() eZ^-gk?  
 ON_WM_QUERYDRAGICON() ZV; lr Vv  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ))qOsphN  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) g}\Yl.  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 6fOh *  
//}}AFX_MSG_MAP )K0BH q7r  
END_MESSAGE_MAP() .jfkOt?2  
# ~SQujgB  
BOOL CCaptureDlg::OnInitDialog() [e:mRMi  
{ ??!+2G#%!  
 CDialog::OnInitDialog(); 7Q(5Nlfcz  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 'L"dM9#>  
 ASSERT(IDM_ABOUTBOX < 0xF000); IC6}s  
 CMenu* pSysMenu = GetSystemMenu(FALSE); w/`I2uYu  
 if (pSysMenu != NULL) h* to%N  
 { ~HH#aXh*  
  CString strAboutMenu; FYe(S V(9  
  strAboutMenu.LoadString(IDS_ABOUTBOX); !\0UEC  
  if (!strAboutMenu.IsEmpty()) '01ifA^  
  { 3',|HA /x  
   pSysMenu->AppendMenu(MF_SEPARATOR); <3;Sq~^  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); A{ :PpYs  
  } 8p?Fql}F [  
 } j(`L)/|O  
 SetIcon(m_hIcon, TRUE); // Set big icon *[(}rpp M  
 SetIcon(m_hIcon, FALSE); // Set small icon ;eG,T-:  
 m_Key.SetCurSel(0); O+Zt*jN;  
 RegisterHotkey(); 7>a-`"`O  
 CMenu* pMenu=GetSystemMenu(FALSE); ib4shaN`  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); `(r [BV|h}  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 2\Vzfca  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); f\ wP}c'  
 return TRUE; // return TRUE unless you set the focus to a control .."=  
} F0O/SI(cA  
ccUq!1  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Wb_'X |"u  
{ F9sVMV  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) '\ $2+*  
 { A{5^A)$  
  CAboutDlg dlgAbout; 3J2j5N:g  
  dlgAbout.DoModal(); 0i[,`>-Av  
 } ,~@Nhd~k  
 else O<0G\sU  
 { N{}XHA  
  CDialog::OnSysCommand(nID, lParam); &TmN^R>  
 } H5f>Q0jq  
} NArql  
?h;Zdv>`xz  
void CCaptureDlg::OnPaint() v'"0Ya  
{ q;dg,Om  
 if (IsIconic())  Pa .D+  
 { )Q_^f'4  
  CPaintDC dc(this); // device context for painting 3x=f}SO&  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); a&6e~E$K2  
  // Center icon in client rectangle e12.suv  
  int cxIcon = GetSystemMetrics(SM_CXICON); "t4$%7L]  
  int cyIcon = GetSystemMetrics(SM_CYICON); TG\3T%gH/s  
  CRect rect; 2]Nc@wX`p  
  GetClientRect(&rect); SjT8 eH #  
  int x = (rect.Width() - cxIcon + 1) / 2;  6j FD|  
  int y = (rect.Height() - cyIcon + 1) / 2; WUQlAsme  
  // Draw the icon 7V6gT}R  
  dc.DrawIcon(x, y, m_hIcon); oUMY?[Wp  
 } n+db#qAj5  
 else UN7>c0B  
 { 1gEeZ\B-&  
  CDialog::OnPaint(); sLGut7@Sg  
 } .w/_Om4T*b  
} lx8@;9fLy  
*_ 2db   
HCURSOR CCaptureDlg::OnQueryDragIcon() uqaP\  
{ iw!kV  
 return (HCURSOR) m_hIcon; YQb43Sh`  
} VTOZ #*f  
kW"6Gc&HUN  
void CCaptureDlg::OnCancel() -!OFt}  
{ yQA6w%  
 if(bTray) VKcO]_W1  
  DeleteIcon(); `GsFvxz  
  CDialog::OnCancel(); _~?N3G  
} "*E#4e[  
26yjQ  
void CCaptureDlg::OnAbout() &tT*GjPwg;  
{ o1x IGP<  
 CAboutDlg dlg; C?v_ig  
 dlg.DoModal(); oxN~(H)/ #  
} g4(vgWOW`  
a}~Xns  
void CCaptureDlg::OnBrowse() U$; FOl  
{ S2/6VoGE  
 CString str; =D<{uovQB  
 BROWSEINFO bi; Bvke@|]kW  
 char name[MAX_PATH]; zmV5k  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); dd+[FU  
 bi.hwndOwner=GetSafeHwnd(); DA)mkp  
 bi.pszDisplayName=name; `Zn2Vx  
 bi.lpszTitle="Select folder"; NdpcfZ q  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ZeVb< g  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); CRK%%;=>  
 if(idl==NULL) CAGaZ rx  
  return; ~&>|u5C*@  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); {0J TN%e  
 str.ReleaseBuffer(); %1E:rw@  
 m_Path=str; (DzV3/+p^  
 if(str.GetAt(str.GetLength()-1)!='\\') QLx]%E\  
  m_Path+="\\"; ,L iX  
 UpdateData(FALSE);  nwH'E  
} cVrses^yE  
ich\`j[i  
void CCaptureDlg::SaveBmp() W0vdU;?%  
{ W'f{u&<  
 CDC dc; u`Ew^-">  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); oz!;sj{,D  
 CBitmap bm; P<AN`un  
 int Width=GetSystemMetrics(SM_CXSCREEN); Jvysvi{8  
 int Height=GetSystemMetrics(SM_CYSCREEN); &"^,Ubfcn"  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 3GkVMYI  
 CDC tdc; < * )u\A  
 tdc.CreateCompatibleDC(&dc); ;Drt4fOxX  
 CBitmap*pOld=tdc.SelectObject(&bm); 39s%CcI`k  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); L;a> J  
 tdc.SelectObject(pOld); _7?LINF9  
 BITMAP btm; aE0yO#=   
 bm.GetBitmap(&btm); JJL#Y  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; [C@0&[[  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); n@9*>D U  
 BITMAPINFOHEADER bih; S|U/m m  
 bih.biBitCount=btm.bmBitsPixel; G.KZZ-=_4  
 bih.biClrImportant=0; F\1{bN|3  
 bih.biClrUsed=0; _<?lP$Xr  
 bih.biCompression=0; vM5u]u!  
 bih.biHeight=btm.bmHeight; X|Gsf= 1S  
 bih.biPlanes=1; &lg+uK  
 bih.biSize=sizeof(BITMAPINFOHEADER); $<jI<vD+:  
 bih.biSizeImage=size; ,(0q  
 bih.biWidth=btm.bmWidth; =;(wBj  
 bih.biXPelsPerMeter=0; !(=bH"P  
 bih.biYPelsPerMeter=0; \M4/?<g  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ZU%7m_zO  
 static int filecount=0; }]cKOv2  
 CString name; I2JE@?  
 name.Format("pict%04d.bmp",filecount++); RC5b'+E&#  
 name=m_Path+name; sWp]Zy  
 BITMAPFILEHEADER bfh; /"d5<B`%  
 bfh.bfReserved1=bfh.bfReserved2=0; tA?P$5?-*  
 bfh.bfType=((WORD)('M'<< 8)|'B'); #S+GI!  
 bfh.bfSize=54+size; bqmOfGM  
 bfh.bfOffBits=54; [([?+Ouy  
 CFile bf; 0( fN  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ m S[Vl6  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); wTBp=)1)f  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); MW%EJT>@z  
  bf.WriteHuge(lpData,size); Ql-RbM  
  bf.Close(); }0Isi G  
  nCount++; 3RpDIl`0  
 } d, j"8\@  
 GlobalFreePtr(lpData); WZ}c)r*R  
 if(nCount==1) 3DRXao  
  m_Number.Format("%d picture captured.",nCount); (Sc]dH  
 else z@hlN3dg  
  m_Number.Format("%d pictures captured.",nCount); LO8V*H(  
  UpdateData(FALSE); NNC@?A7  
} Qn> 0s  
XYD}OddO  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) D6!`p6r+  
{ v*}r<} j  
 if(pMsg -> message == WM_KEYDOWN) .{as"h-.O  
 { xcO Si>  
  if(pMsg -> wParam == VK_ESCAPE) F$Q( 2:w  
   return TRUE; VZNMom,Wr  
  if(pMsg -> wParam == VK_RETURN) e2|2$|  
   return TRUE; +o)o4l%3  
 } -~Kw~RX<(  
 return CDialog::PreTranslateMessage(pMsg); O)|{B>2r  
} R.Xh&@f`  
X&sXss<fO%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) [>xwwm  
{ GD?4/HkF  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ =}5;rK  
  SaveBmp(); Y85M$]e,  
  return FALSE;  ~0 <?^  
} I, 9!["^|  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ]c,ttS _  
 CMenu pop;  6jFc'  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ,a&N1G.  
 CMenu*pMenu=pop.GetSubMenu(0); &VtTUy}  
 pMenu->SetDefaultItem(ID_EXITICON); 26|2r  
 CPoint pt; /I|.^ Id|  
 GetCursorPos(&pt); D4%5T>^LW[  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); `MFw2nu@t  
 if(id==ID_EXITICON) &U:bRzD  
  DeleteIcon(); E,,)?^g  
 else if(id==ID_EXIT) 9dl\`zlA*  
  OnCancel(); 7(B|NYq  
 return FALSE; K:&FWl.  
} mB &nN+MV  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); r jfcZ@  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) UD6D![e  
 AddIcon(); G+?@4?` z  
 return res; [|PVq#(  
} ,@"Z!?e  
jH26-b<  
void CCaptureDlg::AddIcon() Eyu]0+  
{ a-\\A[E  
 NOTIFYICONDATA data; u*u>F@C8  
 data.cbSize=sizeof(NOTIFYICONDATA); >&V?1!N"  
 CString tip; FT'_{e!M  
 tip.LoadString(IDS_ICONTIP); @cNBY7=  
 data.hIcon=GetIcon(0); Oo{+W 5[  
 data.hWnd=GetSafeHwnd(); | _/D-m*  
 strcpy(data.szTip,tip); Erz{{kf]1V  
 data.uCallbackMessage=IDM_SHELL; w5,p9f}.  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; /rp.H'hC  
 data.uID=98; J~7E8  
 Shell_NotifyIcon(NIM_ADD,&data); , |SO'dG  
 ShowWindow(SW_HIDE); xo#&&/6  
 bTray=TRUE; 1{\{'EP{  
} -kY7~yS7  
z-(@j;.  
void CCaptureDlg::DeleteIcon()  qGG  
{ lk8g2H ,  
 NOTIFYICONDATA data; `M?C(  
 data.cbSize=sizeof(NOTIFYICONDATA); ]eA<  
 data.hWnd=GetSafeHwnd(); NQS@i'W=g  
 data.uID=98; seWYY $$  
 Shell_NotifyIcon(NIM_DELETE,&data); J5Rr7=:*S  
 ShowWindow(SW_SHOW); DArEIt6Q  
 SetForegroundWindow(); >o #^r;  
 ShowWindow(SW_SHOWNORMAL); Pnq[r2#]:  
 bTray=FALSE; .&d]7@!qy  
} z7V74hRPX  
 `=b)fE  
void CCaptureDlg::OnChange() PZ2$ [s0W  
{ ;8m_[gfw  
 RegisterHotkey(); UKyOkuY:w  
} 6b+\2-eq  
?CGbnXZ4Ug  
BOOL CCaptureDlg::RegisterHotkey() 4~-"k{Xt  
{ \eD#s  
 UpdateData(); a.)Gd]}g  
 UCHAR mask=0; t{?UNW  
 UCHAR key=0; =mV1jGqX  
 if(m_bControl) <(x[Qp/5P  
  mask|=4; q,-bw2   
 if(m_bAlt) yv| |:wZC  
  mask|=2;  4"72  
 if(m_bShift) TTcMIMyLT  
  mask|=1; YGrmco?G  
  key=Key_Table[m_Key.GetCurSel()]; H&\Ig D  
 if(bRegistered){ c"R`7P  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); hEAt4z0P  
  bRegistered=FALSE; un|+YqLf  
 } TNBFb_F  
 cMask=mask; c;DWSgIw  
 cKey=key; ^ sIxR*C[v  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); t(/b'Peq  
 return bRegistered; s6SG%Vd  
} }R5>ja0  
$h1`-=\7  
  四、小结 Q" BIk =  
QXx<Hi^ /  
  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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