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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: 3?x}48  
  df R?O#JPU  
  一、实现方法 na`8ulN_  
]vQU(@+I  
  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: #I-qL/Lm  
_|C T|q  
#pragma data_seg("shareddata") [ApAd  
HHOOK hHook =NULL; //钩子句柄 knABlU  
UINT nHookCount =0; //挂接的程序数目 W5U;{5  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 0ZJN<AzbA  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 3FQXp  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey +rOfQ'lQ  
static int KeyCount =0; /8[T2Z!  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1  q +*>T=k  
#pragma data_seg() Sd?+j;/"  
IuOQX}  
  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。 }Zp5d7(@w  
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  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: FX&)~)  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR FZ@8&T   
cKey,UCHAR cMask) c]3^2Ag,  
{ g 6!#n  
 BOOL bAdded=FALSE; jx-8%dxtZ  
 for(int index=0;index<MAX_KEY;index++){ oh%/\Xu  
  if(hCallWnd[index]==0){ V?C_PMa  
   hCallWnd[index]=hWnd; q,fk@GI'2  
   HotKey[index]=cKey; mP+rPDGp  
   HotKeyMask[index]=cMask; 0qk.NPMB0  
   bAdded=TRUE; ghVxcK  
   KeyCount++; ^#,cWG}z  
   break; O/{W:hJjd  
  } S X6P>:`  
 } bl-t>aO*.V  
 return bAdded; c[E>2P2-_  
} r/B iR0$E  
//删除热键 !|;w(/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Jm {~H%  
{ cwKOE?!  
 BOOL bRemoved=FALSE; J6*B=PX=(  
 for(int index=0;index<MAX_KEY;index++){ CJ 9tO#R  
  if(hCallWnd[index]==hWnd){ jHWJpm(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ G##^xFx  
    hCallWnd[index]=NULL; C@q&0\HN  
    HotKey[index]=0; ,O}2LaK.O  
    HotKeyMask[index]=0; "Gm:M  
    bRemoved=TRUE; $[-{Mm  
    KeyCount--; 4,g3 c  
    break; D:Y `{{  
   } 9,;+B8-A  
  } )gq(  
 } ^Wz3 q-^  
 return bRemoved; J "dp?i  
} bU i@4S  
Q|W!m0XO  
59I}  
  DLL中的钩子函数如下: Y)X58_En  
3tTz$$-#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) j']Q-s(s  
{ \w=7L- 8  
 BOOL bProcessed=FALSE; 1yIo 'i1  
 if(HC_ACTION==nCode) K-}'Fiq  
 { ,As78^E{  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 iAlFgOk'  
   switch(wParam) "@[xo7T  
   {  'D4KaM.d  
    case VK_MENU: YMx zj  
     MaskBits&=~ALTBIT; Z0e+CEzq  
     break; 5}4MXI4  
    case VK_CONTROL: IBzHXa>75  
     MaskBits&=~CTRLBIT; zA/W+j$:  
     break; u? f3&pA  
    case VK_SHIFT: _u:4y4}  
     MaskBits&=~SHIFTBIT; rS 4'@a  
     break; 'c<@SVF{Zz  
    default: //judge the key and send message :l>T~&/98  
     break; oLn| UWe_  
   } F*d{<  
   for(int index=0;index<MAX_KEY;index++){ 6zLz<p?  
    if(hCallWnd[index]==NULL) G\H@lFh  
     continue; 'Sc3~lm(dH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) x./jTebeO  
    { Sg<''pUh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); V_(?mC  
     bProcessed=TRUE; }# -N7=h  
    } 'eo2a&S2D  
   } 79%${ajSI  
  } b@f. Kd7I  
  else if((lParam&0xc000ffff)==1){ //有键按下 5hpb=2  
   switch(wParam) "7 )F";_(^  
   { C({L4O#?o  
    case VK_MENU: m`9)DsR N  
     MaskBits|=ALTBIT; /:e|B;P`k  
     break; AX1'.   
    case VK_CONTROL: yHt63z8'  
     MaskBits|=CTRLBIT; DI}h?Uf ,  
     break; :7Vm]xd}do  
    case VK_SHIFT: X5U!25d]  
     MaskBits|=SHIFTBIT; KX<RD|=  
     break; igz:ek`  
    default: //judge the key and send message u3,b,p  
     break;  fV}\  
   } aXC`yQ?  
   for(int index=0;index<MAX_KEY;index++){ &r<<4J(t  
    if(hCallWnd[index]==NULL) ?EX'j >  
     continue; ^s5.jlZr@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) g\(7z P  
    { $z mES tcm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); il-&d]AP  
     bProcessed=TRUE; 5[gkGKkf_  
    } Ya9uu@F  
   } Zc9 n0t[  
  } u khI#:[  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 F'j:\F6C;  
   for(int index=0;index<MAX_KEY;index++){ ~hvhT}lE  
    if(hCallWnd[index]==NULL) DR0W)K ^  
     continue; WejY b;KS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?|hzAF"U  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,+X8?9v  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 QHs]~Ja  
   } y ph  
  } _~cmR<  
 } Y*}Sq|y  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); A:NY:#uC  
} huTJ a2  
7>ODaj   
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Pdn.c1[-a  
5;^8wh(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |M K-~ep  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *Cb(4h-  
./g0T{&  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: UJm`GO  
W"Rii]GK"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ,5\n%J:  
{ r=w%"3vb^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Sc0ZT/Lm  
 { isd[l-wAmf  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Ci*5E$+\  
  SaveBmp(); rb_G0/R  
  return FALSE; ji8 Rd"S  
 } xxiLi46/  
 …… //其它处理及默认处理 y1'/@A1  
} >'T%=50YH  
Z~nl{P#  
/.?\P#9)  
  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。 9qW,I|G  
zV &3l9?U  
  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。 )b7mzDp(  
9BY b{<0tS  
  二、编程步骤 ~8X' p6  
}"8_$VDcz  
  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"; 0I_;?i  
`Q8 D[  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 7/1S5yUr|  
.Sn1YAhE  
  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; z%KChU  
MQ+ek4  
  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; Xm4wuX"e=  
96.Wfx  
  5、 添加代码,编译运行程序。 lV 9q;!/1  
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三、程序代码 ,J^Op   
 4{?x(~  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ; M(}fV]  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) OS 6 )`  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ op*+fJHD  
#if _MSC_VER > 1000 c`.:"i" k3  
#pragma once C;5}/J^E  
#endif // _MSC_VER > 1000 U)!AH^{32  
#ifndef __AFXWIN_H__ W% [5~N  
#error include 'stdafx.h' before including this file for PCH ts]7 + 6V  
#endif uS'ji k}  
#include "resource.h" // main symbols 39j d}]e  
class CHookApp : public CWinApp =<05PB  
{ "Pc,+>vh  
 public: Vk (bU=w  
  CHookApp(); R}>Do=hAO  
  // Overrides a}K+w7VY\  
  // ClassWizard generated virtual function overrides nf4 P2<L!  
  //{{AFX_VIRTUAL(CHookApp) ="DgrH  
 public: Em,!=v(*  
  virtual BOOL InitInstance(); DX"; v J  
  virtual int ExitInstance(); oc(bcU  
  //}}AFX_VIRTUAL [f0HUbPX  
  //{{AFX_MSG(CHookApp)  vt N5{C  
  // NOTE - the ClassWizard will add and remove member functions here. DVJc-.x8  
  // DO NOT EDIT what you see in these blocks of generated code ! FQFENq''B  
  //}}AFX_MSG Ic K=E ]p  
  DECLARE_MESSAGE_MAP() ry ?2 o!  
}; ~@8d[Tb  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 2M?lgh4"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F4x7;?W{*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;ZJ,l)BNO  
BOOL InitHotkey(); ,[\(U!Z7:%  
BOOL UnInit();  >Gu0&  
#endif hD1AK+y  
>~rd5xlk  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. #!jRY!2Vt  
#include "stdafx.h" <o+ 7U  
#include "hook.h" "yTh +=  
#include <windowsx.h> w<Cmzkf  
#ifdef _DEBUG _oTT3[7P  
#define new DEBUG_NEW :XSc#H4  
#undef THIS_FILE UD2<!a'T  
static char THIS_FILE[] = __FILE__; CLEG'bZa,  
#endif =h::VB}Lv  
#define MAX_KEY 100 41o!2(e$  
#define CTRLBIT 0x04 {@5WeWlz~  
#define ALTBIT 0x02 RYl3txw  
#define SHIFTBIT 0x01 Qz+d[%Q}x  
#pragma data_seg("shareddata") _c8.muQ<  
HHOOK hHook =NULL; S7ehk*`  
UINT nHookCount =0; (D m"e`  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey SU O;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT B" m:<@ "  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey s}#[*WOc  
static int KeyCount =0; gAA %x 7  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift sNfb %r  
#pragma data_seg() IIQ3|eZ  
HINSTANCE hins; #A/J^Ko  
void VerifyWindow(); pq?[wp"  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) :F>L;mp  
//{{AFX_MSG_MAP(CHookApp) |M<.O~|D6}  
// NOTE - the ClassWizard will add and remove mapping macros here. d50IAa^p6J  
// DO NOT EDIT what you see in these blocks of generated code! A Ok7G?Y  
//}}AFX_MSG_MAP (U'7Fc  
END_MESSAGE_MAP() .;Utkf'I  
J )8pqa   
CHookApp::CHookApp() Ot$cmBhw!  
{ P}+|`>L  
 // TODO: add construction code here, qa$[L@h>  
 // Place all significant initialization in InitInstance EkStb#  
} b6!Q!:GO&  
wAYzR$i  
CHookApp theApp; 0Dm`Ek3A7x  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) M,\|V3s  
{ hw ;dm  
 BOOL bProcessed=FALSE; jO&f*rxN  
 if(HC_ACTION==nCode)  Z|:_ c  
 { U.pr} hq  
  if((lParam&0xc0000000)==0xc0000000){// Key up ;%rs{XO9  
   switch(wParam) >b4YbLkI#  
   { -wtTq ph'  
    case VK_MENU: @%G'U&R{  
     MaskBits&=~ALTBIT; K*Nb_|~  
     break; C*{15!d:G  
    case VK_CONTROL: 1RI#kti-"  
     MaskBits&=~CTRLBIT; GwMUIevO_  
     break; f`u5\!}=!  
    case VK_SHIFT: 0l(E!d8&'  
     MaskBits&=~SHIFTBIT; igRDt{}  
     break; !8  wid&  
    default: //judge the key and send message kol,Qs  
     break; lrmt)BLoh  
   } mq{$9@3  
   for(int index=0;index<MAX_KEY;index++){ cy&  
    if(hCallWnd[index]==NULL) c<+g|@A#  
     continue; $LxG>db  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Bt*&L[&57  
    { |~/3u/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); nj~$%vmA  
     bProcessed=TRUE; (:&&;]sI  
    } f gK2.;>  
   } mJGO)u&  
  } 8"?Vcw&  
  else if((lParam&0xc000ffff)==1){ //Key down 2rR@2Vsw2  
   switch(wParam) e-%7F]e  
   { 'FPcAW^8  
    case VK_MENU: @wYQLZ  
     MaskBits|=ALTBIT; r6 oX6.c  
     break; uS: A4tN  
    case VK_CONTROL: S|{Yvyp  
     MaskBits|=CTRLBIT; 1BMV=_  
     break; DqurHQ z)m  
    case VK_SHIFT: AQnJxIL:  
     MaskBits|=SHIFTBIT; Pg*?[^*  
     break; ]b0zkoD9<  
    default: //judge the key and send message c ,h.`~{  
     break; +X* F<6mZ  
   } R\9>2*w  
   for(int index=0;index<MAX_KEY;index++) a gmeiJT  
   { r!=]Q}`F  
    if(hCallWnd[index]==NULL) \yJZvhUk  
     continue; m6bWmGn GC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2cs?("8e%  
    { k8InbX[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); mC*W2#1pF  
     bProcessed=TRUE; i63`B+L{  
    } 8~&F/C*  
   } RJtix uvh@  
  } tl{]gz  
  if(!bProcessed){ 1?D8|<  
   for(int index=0;index<MAX_KEY;index++){ ZfFIX5Qd\  
    if(hCallWnd[index]==NULL)  uD.  
     continue; nu4Pc  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7%:??*"~  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -{yDk$"  
   } 3n.+_jQ>s  
  } 'sm[CNzS  
 } Qv&T E3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?Ia4H   
} 9O),/SH;:  
uuI3NAi~  
BOOL InitHotkey() ucQezmie  
{ Kwy1SyU  
 if(hHook!=NULL){ T5 K-gz7A  
  nHookCount++; pj!k|F9  
  return TRUE; y-E1]4?})  
 } q1N4X7<_  
 else _Ct}%-,4  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); QDIsC  
  if(hHook!=NULL) 7ZF}0K$^B  
   nHookCount++; ::p-9F  
  return (hHook!=NULL); 8pX f T%]  
} 0^J*+  
BOOL UnInit() 1k!D0f3qb  
{ ,3G$`  
 if(nHookCount>1){ X tJswxw`K  
  nHookCount--; !Bag}|#  
  return TRUE; "AT&!t[J  
 } Rb{+Ki  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Q<z)q<e  
 if(unhooked==TRUE){ Sv.KI{;v$  
  nHookCount=0; c eqFQ  
  hHook=NULL; \U==f &G?J  
 } Zk wJ.SuU  
 return unhooked; 60~v t04  
} 0Wa#lkn$I  
cYsR0#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |c<XSX?ir  
{ cL6 6gOEL  
 BOOL bAdded=FALSE; aZ8h[#]7  
 for(int index=0;index<MAX_KEY;index++){ w(aUEWYL  
  if(hCallWnd[index]==0){ |__d 8a  
   hCallWnd[index]=hWnd; fW(;   
   HotKey[index]=cKey; $B<~0'6}  
   HotKeyMask[index]=cMask; #1MKEfv(~  
   bAdded=TRUE; ,Yo: &>As  
   KeyCount++; pMOD\J:l,  
   break; 4\v~HFsv  
  } 'T%IvJ#Xu  
 } QT_Srw@  
 return bAdded; TV<Aj"xw  
} ki#y&{v9Be  
! &y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S<*';{5~  
{ C:Vv!u  
 BOOL bRemoved=FALSE; &Y{F? c^  
 for(int index=0;index<MAX_KEY;index++){  /; +oz  
  if(hCallWnd[index]==hWnd){ 'wa g |-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |n)<4%i8J  
    hCallWnd[index]=NULL; T)`gm{T  
    HotKey[index]=0; 'HCnB]1  
    HotKeyMask[index]=0; k@7kNMl  
    bRemoved=TRUE; ^Wf S\M`  
    KeyCount--; v Xc!Zg~  
    break; \{lE0j7}h  
   } ;jF%bE3  
  } }lH;[+u3  
 } 0"4J"q]&  
 return bRemoved; v< Ty|(gd  
} ^[0" vtb  
O!/ekU|,r  
void VerifyWindow() @#A!w;bz  
{ f KHse$?_  
 for(int i=0;i<MAX_KEY;i++){ $-Cy  
  if(hCallWnd!=NULL){ R^uc%onP  
   if(!IsWindow(hCallWnd)){ !f@XDW&R  
    hCallWnd=NULL; )t 5;d  
    HotKey=0; ::ri3Tu  
    HotKeyMask=0; a`s/qi  
    KeyCount--; ;e2Ij  
   } lz- iCZ  
  } PaNeu1cO  
 } Y^yG/F  
} f*v1J<1#  
.3(;9};  
BOOL CHookApp::InitInstance() X`D+jiQ(f  
{ <;aJ#qT  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); CPVmF$A-  
 hins=AfxGetInstanceHandle(); ERp{gB2U?  
 InitHotkey(); RU7!U mf  
 return CWinApp::InitInstance(); 2?*||c==*  
} ?/)lnj)e{  
a/:]"`)  
int CHookApp::ExitInstance() UP?D@ogl<  
{ sLZ>v  
 VerifyWindow(); zs0hXxTY:  
 UnInit(); ZRPE-l_3:  
 return CWinApp::ExitInstance(); >GmN~"iJ  
} ~x\Cmu9`  
a&N%|b K  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 'd+:D'  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) .x>HA^4  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ v[smQO  
#if _MSC_VER > 1000 Qne0kB5m  
#pragma once Hk~k@Wft  
#endif // _MSC_VER > 1000 cFDxjX?~  
r,Ds[s)B  
class CCaptureDlg : public CDialog oE6|Zw  
{ W-ez[raY  
 // Construction 16?C@` S>  
 public: m9woredS,  
  BOOL bTray; nGns}\!7'  
  BOOL bRegistered; i+1Qf  
  BOOL RegisterHotkey(); x^X$M$o,l  
  UCHAR cKey; 5N1}Ns  
  UCHAR cMask; _F^$aZt?e  
  void DeleteIcon(); _; 7fraqX  
  void AddIcon(); Fe5jdV<  
  UINT nCount; A=y"x$%-_  
  void SaveBmp(); dqxd3,Z  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor nc&Jmo7  
  // Dialog Data d@Q][7  
  //{{AFX_DATA(CCaptureDlg) JN|VPvjE   
  enum { IDD = IDD_CAPTURE_DIALOG }; VXwPdMy*L  
  CComboBox m_Key; iE=P'"I  
  BOOL m_bControl; +aj^Cs1$  
  BOOL m_bAlt; KJdz v!l=  
  BOOL m_bShift; ~{P:sjsU  
  CString m_Path; 5j`v`[B;  
  CString m_Number; R:f7LRF/\  
  //}}AFX_DATA EX+,:l\^  
  // ClassWizard generated virtual function overrides D^|7#b,zcH  
  //{{AFX_VIRTUAL(CCaptureDlg) +9C;<f  
 public: drIK(u\_  
  virtual BOOL PreTranslateMessage(MSG* pMsg); }PZ=`w*O  
 protected: &XtRLt gS  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support hiN/S|JN8y  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); O_AGMW/2+  
  //}}AFX_VIRTUAL ]4o?BkL  
  // Implementation ZV( w  
 protected: p[-{]!  
  HICON m_hIcon; `.8UKSH+  
  // Generated message map functions vhpvO >Q  
  //{{AFX_MSG(CCaptureDlg) ;s}3e#$L  
  virtual BOOL OnInitDialog(); 6__K#r  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); puF%=i  
  afx_msg void OnPaint(); 'hF@><sqk  
  afx_msg HCURSOR OnQueryDragIcon(); d;44;*D  
  virtual void OnCancel(); B9^R8|V  
  afx_msg void OnAbout(); Pr/]0<s  
  afx_msg void OnBrowse(); !F$R+A+L  
  afx_msg void OnChange(); h)@InYwu7  
 //}}AFX_MSG I7zn>^0}  
 DECLARE_MESSAGE_MAP() VaJfD1zd1  
}; 1a8$f5  
#endif e T-9  
)*D'csGc  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file L {qJ-ln:  
#include "stdafx.h" e "n|jRh  
#include "Capture.h" c{4R*|^  
#include "CaptureDlg.h" Q1T@oxV  
#include <windowsx.h> _Ex|f5+  
#pragma comment(lib,"hook.lib") %Rarr  
#ifdef _DEBUG tN2 W8d  
#define new DEBUG_NEW TVeJ6  
#undef THIS_FILE 7"K^H]6u30  
static char THIS_FILE[] = __FILE__; W_}/O'l{  
#endif $20s]ywS  
#define IDM_SHELL WM_USER+1 Ue!Q."  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 61|B]ei/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u E.^w;~2=  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ,]q%/yxi  
class CAboutDlg : public CDialog enumK\  
{ zo44^=~%  
 public: R@n5AN(  
  CAboutDlg(); 8Zw]f-5x\  
  // Dialog Data |_nC6 ;  
  //{{AFX_DATA(CAboutDlg) u>o<tw%Y  
  enum { IDD = IDD_ABOUTBOX }; c,$mWTC  
  //}}AFX_DATA 1R^4C8*B  
  // ClassWizard generated virtual function overrides &I)\*Ue2t  
  //{{AFX_VIRTUAL(CAboutDlg) [%~^kq=|  
 protected: jb3.W  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support v$3_o :  
  //}}AFX_VIRTUAL `xIh\q  
  // Implementation ^@"c`  
 protected: i~8DSshA  
  //{{AFX_MSG(CAboutDlg) ~p.%.b;~t  
  //}}AFX_MSG F.0d4:A+  
  DECLARE_MESSAGE_MAP() )&z4_l8`=  
}; g ;LVECk  
?Pnx ~m{%*  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) c'rd$  
{ ~S;!T  
 //{{AFX_DATA_INIT(CAboutDlg) m}pL`:e!  
 //}}AFX_DATA_INIT [-58Ezyr  
} 4#h ?Wga  
>h%\HMKk  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) nsl*Dm"*F  
{ <I 1y  
 CDialog::DoDataExchange(pDX); $',3Pv  
 //{{AFX_DATA_MAP(CAboutDlg) I.9o`Q[8&  
 //}}AFX_DATA_MAP qguVaV4Y  
} oZ-FF'  
~d>uXrb  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 9v$qrM`8  
 //{{AFX_MSG_MAP(CAboutDlg) HEpM4xe$  
 // No message handlers 9FNwpL'C  
 //}}AFX_MSG_MAP MHl^/e@  
END_MESSAGE_MAP() %A2`&:ip  
9 `INC~h  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) z{M8Yf |  
: CDialog(CCaptureDlg::IDD, pParent) 6Hn)pD#U  
{ y1u9 B;Fd  
 //{{AFX_DATA_INIT(CCaptureDlg) IXJ6PpQLv  
  m_bControl = FALSE; }! =U^A)  
  m_bAlt = FALSE; B kV(81"C  
  m_bShift = FALSE; {U6"]f%  
  m_Path = _T("c:\\"); 4Cd#sQ  
  m_Number = _T("0 picture captured."); t9Vb~ Ubdb  
  nCount=0; 3&9zGy{V+  
  bRegistered=FALSE; pw;r 25   
  bTray=FALSE; #B}Qt5w  
 //}}AFX_DATA_INIT $l#{_~ "m7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 0[i}rC9&  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); .HCaXFW  
} V4EM5 Z\k  
yl]UUBcQ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) rg*^w!   
{ [9HYO  
 CDialog::DoDataExchange(pDX); Oj-r;Tt_G}  
 //{{AFX_DATA_MAP(CCaptureDlg) @`Wt4<  
  DDX_Control(pDX, IDC_KEY, m_Key); y<v|X2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 6+)x7g1PL  
  DDX_Check(pDX, IDC_ALT, m_bAlt); eK *W =c#@  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); f,JX"  
  DDX_Text(pDX, IDC_PATH, m_Path); C/y(E |zC$  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ,S0UY):(A  
 //}}AFX_DATA_MAP -~} tq]  
} vs\|rLa  
tJz^DXqAc  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) D!/0c]"  
//{{AFX_MSG_MAP(CCaptureDlg) iU XM( ]  
 ON_WM_SYSCOMMAND() k{1b20  
 ON_WM_PAINT() qy6K,/& 3  
 ON_WM_QUERYDRAGICON() dxntGH< O  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ZBC@xM&-  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) %!yxC  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 'xk1o,;  
//}}AFX_MSG_MAP A'`P2Am  
END_MESSAGE_MAP() Gn[*?=Vy  
 VmYBa(  
BOOL CCaptureDlg::OnInitDialog() W.p66IQwL&  
{ 3@'lIV ?,q  
 CDialog::OnInitDialog(); ~Zu}M>-^c,  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ?jFc@t*\:  
 ASSERT(IDM_ABOUTBOX < 0xF000); jP7w6sk E  
 CMenu* pSysMenu = GetSystemMenu(FALSE); xh`Du|jvm  
 if (pSysMenu != NULL) ^7<[}u;qF  
 { > R#9\/s  
  CString strAboutMenu; YMK>+y[+4  
  strAboutMenu.LoadString(IDS_ABOUTBOX); UFL0 K  
  if (!strAboutMenu.IsEmpty()) `[&v  
  { C-&#r."L  
   pSysMenu->AppendMenu(MF_SEPARATOR); (]}XLMi,|!  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); [{?;c+[  
  } o:4CI  
 } 7fUi?41XA  
 SetIcon(m_hIcon, TRUE); // Set big icon K# /Ch5?  
 SetIcon(m_hIcon, FALSE); // Set small icon sb 8dc  
 m_Key.SetCurSel(0); \k4M{h6  
 RegisterHotkey(); ThbP;CzI#  
 CMenu* pMenu=GetSystemMenu(FALSE); unpfA#&!"  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); FGDw;lEa9[  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 4sI3(z)9H  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); NPP3 (3C  
 return TRUE; // return TRUE unless you set the focus to a control <e[!3,%L  
} 7f[8ED[4  
>d'EInSF  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) FDl,Ey^r/  
{ '8L(f w{k  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) G;Us-IRZ  
 { 1 iquHn  
  CAboutDlg dlgAbout; P&h/IBA_  
  dlgAbout.DoModal(); C CLfvex  
 } j\nE8WH  
 else t;oT {Hge  
 { 1`nc8qC  
  CDialog::OnSysCommand(nID, lParam); >\RDQ%z  
 } !'Gb$l!  
} Wn2Ny jX  
5c*p2:]  
void CCaptureDlg::OnPaint() >aX:gN  
{ $>nkGb%Kp  
 if (IsIconic()) <XU8a:w'T  
 { m9v"v:Pw  
  CPaintDC dc(this); // device context for painting t%0r"bTi  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); X+/{%P!w  
  // Center icon in client rectangle 3we.*\2$  
  int cxIcon = GetSystemMetrics(SM_CXICON); fma tc#G  
  int cyIcon = GetSystemMetrics(SM_CYICON); ,<`|-oa  
  CRect rect; X}_QZO=z  
  GetClientRect(&rect); FZM ]o  
  int x = (rect.Width() - cxIcon + 1) / 2; -lnTYxo+]^  
  int y = (rect.Height() - cyIcon + 1) / 2; l2z`<2mp  
  // Draw the icon GZxglU,3T  
  dc.DrawIcon(x, y, m_hIcon); L3-<Kop  
 } mrhsKmH  
 else /h{go]&Nb  
 { 1\M"`L/  
  CDialog::OnPaint(); 0+$hkd n  
 } ex0 kb  
} ~gSF@tz@  
D}=/w+  
HCURSOR CCaptureDlg::OnQueryDragIcon() ~}hba3&b;#  
{ yffU% )  
 return (HCURSOR) m_hIcon; 'vqj5YTj  
} 2@"0} po#  
z226yNlS  
void CCaptureDlg::OnCancel() ;m2"cL>{l  
{ n"K {uj))  
 if(bTray) LAu+{'O\  
  DeleteIcon(); 6qz!M  
  CDialog::OnCancel(); +MOe{:/6  
} [R@q]S/  
="'rH.n #  
void CCaptureDlg::OnAbout() muqfSF  
{ 0ECO/EuCg  
 CAboutDlg dlg; (;Dn%kK  
 dlg.DoModal(); !."%M^J  
} <:kTTye|  
j L>I5f  
void CCaptureDlg::OnBrowse() 2V=FWuXC"  
{ #J<`p  
 CString str; g 'd*TBnk  
 BROWSEINFO bi; .:|#9%5  
 char name[MAX_PATH]; D>"{H7m Y  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Uy_}@50"l  
 bi.hwndOwner=GetSafeHwnd(); Qzs\|KS  
 bi.pszDisplayName=name; 4cVs(`g^  
 bi.lpszTitle="Select folder"; toYg$IV  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ECE{xoc  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); =ihoVA:|  
 if(idl==NULL) TS~Y\Cp  
  return; c9cphZ(z  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); dl3LDB  
 str.ReleaseBuffer(); ;#6<bV  
 m_Path=str; C&d"#I  
 if(str.GetAt(str.GetLength()-1)!='\\') (x@i,Ba@  
  m_Path+="\\";  t3yQ/  
 UpdateData(FALSE); dWq/)%@t  
} 0x9F*i_  
F~d7;x =g  
void CCaptureDlg::SaveBmp() B3g82dm  
{ A aF5`  
 CDC dc; i"\AyKiJ  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;5JIY7t  
 CBitmap bm; T$N08aju#  
 int Width=GetSystemMetrics(SM_CXSCREEN); 3Av(|<cR  
 int Height=GetSystemMetrics(SM_CYSCREEN); G+QNg .pH  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 61Iy{-/ZV  
 CDC tdc; r* /XB0  
 tdc.CreateCompatibleDC(&dc); uX5 --o=C  
 CBitmap*pOld=tdc.SelectObject(&bm); &Ow?Hd0  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); p?`|CE@h7  
 tdc.SelectObject(pOld); =ZJ?xA8  
 BITMAP btm; i&s=!`  
 bm.GetBitmap(&btm); WNlSve)]ie  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 39a]B`y  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &T{B~i3w8  
 BITMAPINFOHEADER bih; Qig!NgOM  
 bih.biBitCount=btm.bmBitsPixel; J ]l@ r  
 bih.biClrImportant=0; m 'H  
 bih.biClrUsed=0; ]JCB^)tM  
 bih.biCompression=0; E.Q} \E  
 bih.biHeight=btm.bmHeight; YQ8x6AJ  
 bih.biPlanes=1; __zu- !v  
 bih.biSize=sizeof(BITMAPINFOHEADER); 'N5r2JL[w  
 bih.biSizeImage=size; <+1w'-  
 bih.biWidth=btm.bmWidth; g]#zWTw(   
 bih.biXPelsPerMeter=0; s:Ql](/B#  
 bih.biYPelsPerMeter=0; g2b4 ia!L  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); &=yqWW?  
 static int filecount=0; PG~m-W+  
 CString name; O/r<VT Op  
 name.Format("pict%04d.bmp",filecount++); wqoN@d  
 name=m_Path+name; nF[eb{GR`  
 BITMAPFILEHEADER bfh; 96V, [-arf  
 bfh.bfReserved1=bfh.bfReserved2=0; "YvBb:Z>  
 bfh.bfType=((WORD)('M'<< 8)|'B'); E|A_|FS&%  
 bfh.bfSize=54+size; T+{'W  
 bfh.bfOffBits=54; Yw1q2jT  
 CFile bf; z^GGJu%vjr  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ]~<T` )Hi  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); =Q 0 )t_z_  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); p{#7\+}  
  bf.WriteHuge(lpData,size); 8lb `   
  bf.Close(); u H;^>`DT  
  nCount++; @5@{Es1u  
 } |2]WA'q  
 GlobalFreePtr(lpData); xMGd'l?  
 if(nCount==1) ~#x!N=q  
  m_Number.Format("%d picture captured.",nCount); `2~Ea_Z  
 else G uI sM  
  m_Number.Format("%d pictures captured.",nCount); J#;m)5[ a%  
  UpdateData(FALSE); "@|V.d@  
} SmEd'YD!J  
!g:G{b  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) T`DlOi]Z_  
{ %+JTQy  
 if(pMsg -> message == WM_KEYDOWN) aRKG)0=  
 { U"G+su->e  
  if(pMsg -> wParam == VK_ESCAPE) !8M'ms>s=  
   return TRUE; I8>1RXz  
  if(pMsg -> wParam == VK_RETURN) ] :#IZ0#  
   return TRUE; <iqyDPj  
 } `^h##WaXap  
 return CDialog::PreTranslateMessage(pMsg); ]lG\t'R  
} ]h8V{%H  
+~AI(h  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }u)G ERWO  
{ 4f~ZY]|nM  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ F!t13%yeu?  
  SaveBmp(); nvs7s0@Fqe  
  return FALSE; ZDD|MH  
} };sm8P{M  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ v0J1%{/xs  
 CMenu pop; |*a>6y  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6>A8#VT  
 CMenu*pMenu=pop.GetSubMenu(0); WSwmX3rn  
 pMenu->SetDefaultItem(ID_EXITICON); Oz7v hOU  
 CPoint pt; iB_j*mX]  
 GetCursorPos(&pt); ?P]md9$(+e  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); uV:;y}T^Z  
 if(id==ID_EXITICON) VX%\_@  
  DeleteIcon(); bGa":|}F  
 else if(id==ID_EXIT) g?M69~G$:x  
  OnCancel(); Agf!6kh  
 return FALSE; RO8Ynm2 <  
} DF =. G1  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); '>$A7  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) gf>5xf{M  
 AddIcon(); XITQB|C??$  
 return res; Z&!$G'X  
} Ymvd= F   
VG^-aR_F  
void CCaptureDlg::AddIcon() D1k]  
{ &YMj\KmlSg  
 NOTIFYICONDATA data; O}V2> W$  
 data.cbSize=sizeof(NOTIFYICONDATA); tDkqwF),  
 CString tip; UW3F)  
 tip.LoadString(IDS_ICONTIP); bcNYoZ8`  
 data.hIcon=GetIcon(0); G7?EaLsfQ  
 data.hWnd=GetSafeHwnd(); 0qd`Pf   
 strcpy(data.szTip,tip); Az[z} r4  
 data.uCallbackMessage=IDM_SHELL; Y$^QH.h  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; f*Bc`+G  
 data.uID=98; C5z4%,`f  
 Shell_NotifyIcon(NIM_ADD,&data); \ZH=$c*W  
 ShowWindow(SW_HIDE); 3]P=co@  
 bTray=TRUE; UHWun I S  
} qE[}Cf]X  
zx*f*L,6F  
void CCaptureDlg::DeleteIcon() t!GY>u>`  
{ -6\9B>qa  
 NOTIFYICONDATA data; S;~_9i]upe  
 data.cbSize=sizeof(NOTIFYICONDATA); =Ju}{ bX  
 data.hWnd=GetSafeHwnd(); WRCi!  
 data.uID=98; }$ der  
 Shell_NotifyIcon(NIM_DELETE,&data); [cq>QMW  
 ShowWindow(SW_SHOW); f?QD##~;  
 SetForegroundWindow(); +zvK/Fj2q  
 ShowWindow(SW_SHOWNORMAL); 2S3F]fG0  
 bTray=FALSE; !O*n6}nPE  
} 7w|s8B  
ORNE>6J H  
void CCaptureDlg::OnChange() aU @z\sQ  
{ n)yqb  
 RegisterHotkey(); A|^?.uIM  
} #@ G2n@Hj  
)? xg=o/?  
BOOL CCaptureDlg::RegisterHotkey() 4|qp&%9-  
{ H;8(y4;  
 UpdateData(); :L,]<n  
 UCHAR mask=0; $HRpG  
 UCHAR key=0; a%kj)ah  
 if(m_bControl) _B2t|uQ  
  mask|=4;  f!<mI8H  
 if(m_bAlt) [0 $Y@ek[  
  mask|=2; XB?!V|bno  
 if(m_bShift) Z6I!4K  
  mask|=1; R)v`ZF,/b  
  key=Key_Table[m_Key.GetCurSel()]; Z(s} #-  
 if(bRegistered){ <mxUgU  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); h W-[omr0  
  bRegistered=FALSE; shD$,! k  
 } -M4#dHR_!  
 cMask=mask; U!h!z`RU54  
 cKey=key; NJ~'`{3v  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); \l`;]cA  
 return bRegistered; ` H"5nQRV  
} rpvm].4  
=LC5o2bLy  
  四、小结 w v1R ]3}  
wz ,woF|  
  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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