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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: 8zZvht*  
  ep!Rf:  
  一、实现方法 &PR5q 7  
rN<0 R`4sE  
  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: R3 -n>V5o  
lUOF4U&r  
#pragma data_seg("shareddata") Vh'P&W?[  
HHOOK hHook =NULL; //钩子句柄 F%@A6'c  
UINT nHookCount =0; //挂接的程序数目 E-T)*`e  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 }n]Ng]KM`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ;,hwZZA  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey iw3FA4{(  
static int KeyCount =0; Ot4 Z{mA  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 b)6D_Az7c  
#pragma data_seg() Y xr>"KH6a  
T:27r8"Rh  
  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。 v"y-0$M  
JA %J$d  
  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: 52@C9Q,  
]i|h(>QWP  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR rJ`!:f  
cKey,UCHAR cMask) p)KheLiZ  
{ &y\prip  
 BOOL bAdded=FALSE; 1h^:[[!c  
 for(int index=0;index<MAX_KEY;index++){ m]'#t)B_m  
  if(hCallWnd[index]==0){ "IZa!eUW  
   hCallWnd[index]=hWnd; 0pZ4BZdT|  
   HotKey[index]=cKey; ]&o$b]  
   HotKeyMask[index]=cMask; ;;!yC  
   bAdded=TRUE; NxkGOAOE  
   KeyCount++; fe\mL mK9  
   break; =ElO?9&  
  } Y4J3-wK5  
 } h1j!IG  
 return bAdded; tZ]?^_Y1  
} / kF)  
//删除热键 W\>fh&!)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Cz9xZA{[M  
{ mUNn%E:7@{  
 BOOL bRemoved=FALSE; q_MPju&*  
 for(int index=0;index<MAX_KEY;index++){ [8Y:65  
  if(hCallWnd[index]==hWnd){ b_$4V3TA  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ AiwOc+R  
    hCallWnd[index]=NULL; EuEZ D +  
    HotKey[index]=0; =rMUov h  
    HotKeyMask[index]=0; 9e<.lb^tP  
    bRemoved=TRUE; `fA@hK   
    KeyCount--; ^7 w+l @  
    break; r)Ma3FL0;  
   } |-fg j'  
  } vHgi <@u  
 } >Rl"  
 return bRemoved; *l"T$H   
} wy<\Tg^J  
b(,M1.[qt  
zN[hkmh  
  DLL中的钩子函数如下: ?j'7l=94A  
;!>rnxB?4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) J! AgBF N4  
{ &u]8IEv}u  
 BOOL bProcessed=FALSE; } +TORR?  
 if(HC_ACTION==nCode) a[>/h3  
 { wx]0p  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 IQAZuN"<  
   switch(wParam) 4svBzZdr  
   {  HCIU!4rH  
    case VK_MENU: |hKDvH  
     MaskBits&=~ALTBIT; 7!$Q;A  
     break; |T<_5Ik  
    case VK_CONTROL: c/:b.>W  
     MaskBits&=~CTRLBIT; ~Zun&b)S  
     break; /74QMx?  
    case VK_SHIFT: ;nI] !g:  
     MaskBits&=~SHIFTBIT; F3y9@dA]  
     break; /,BD#|  
    default: //judge the key and send message zUt' QH7E.  
     break; h8x MI  
   } AgWa{.`f:  
   for(int index=0;index<MAX_KEY;index++){ 2A']y D  
    if(hCallWnd[index]==NULL) +=>,Pto<  
     continue; M=8.Bp|Ye  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) gI&#o@Pm  
    { e+=y*OmQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); d8DV[{^  
     bProcessed=TRUE; f- K+]aZ)  
    } V)3KS-  
   } ^\hG"5#  
  } \q>bs|2  
  else if((lParam&0xc000ffff)==1){ //有键按下 YC*"Thuu  
   switch(wParam) l z/8  
   { =h-U  
    case VK_MENU: CLxynZ \;  
     MaskBits|=ALTBIT; Yc`o5Q\>  
     break; GiJ *Wp  
    case VK_CONTROL: C0sX gM  
     MaskBits|=CTRLBIT; Wt*cIZ  
     break; *zaQx+L  
    case VK_SHIFT: p99 ]  
     MaskBits|=SHIFTBIT; $CRm3#+ ~  
     break; <KJ/<0l  
    default: //judge the key and send message ;/bewivNJ  
     break; H/"-Z;0{  
   } 7dN*lks  
   for(int index=0;index<MAX_KEY;index++){ S:u:z=:r  
    if(hCallWnd[index]==NULL) 'I`&Yo~c9  
     continue; `oAW7q)~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zZ:>do\2  
    { bpOYHc6,*`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); gK+ 4C  
     bProcessed=TRUE; @Y?#Sl*  
    } e- ~N"  
   } _H9 MwJ  
  } 1]d!~  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ,D5cjaX<  
   for(int index=0;index<MAX_KEY;index++){ d}Xr}  
    if(hCallWnd[index]==NULL) fIM,lt  
     continue; )n1_(;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) jxP;>K7O  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); k}S :RK  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Cw~q4A6'  
   } Vo4,@scG  
  } j SHk{T!J  
 } .L+6 $8m  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /hpY f]t  
} c|f<u{'  
l\f*d6o  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: B=U 3  
y3vdUauOn  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); dR K?~1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bes<qy  
4M^= nae  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: oxr#7Ei0d  
yyR0]NzYUD  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) pk>^?MO  
{ IWk4&yHUAu  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Lk|hQ  
 { !zBhbmlKt  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 \h+AXs<j  
  SaveBmp(); JX<)EZ!F  
  return FALSE; &g#@3e1>  
 } }?lrU.@zg  
 …… //其它处理及默认处理 []D&bYpv  
} t1]K<>g  
md+nj{Ib  
=-tw5], L  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 3\AU 72-  
'-wj9OU  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ( B!uy`  
<xup'n^7C  
  二、编程步骤 "WlZ)wyF%  
6d:zb;Iz  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; <<UB ^v m  
6 o^,@~:R  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; `34zkPB??  
j 'FVz&  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ?}qttj  
'|ad_M  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; y~(h>gi,x  
.nTwPrG  
  5、 添加代码,编译运行程序。 \-L&5x"x  
u^&A W$  
三、程序代码 vjLJi nJ/  
vp1941P  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Mc@e0  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Ltv]pH}YN  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ \Bz_p'[G  
#if _MSC_VER > 1000 Y21g{$~Q{  
#pragma once AW%50V  
#endif // _MSC_VER > 1000 [<7@{;r  
#ifndef __AFXWIN_H__ %W'v}p  
#error include 'stdafx.h' before including this file for PCH ^9m\=5d  
#endif $': E\*ICb  
#include "resource.h" // main symbols ycc4W*]  
class CHookApp : public CWinApp }q`ts=dlGt  
{ +00b)TF  
 public: UMv.{iEj  
  CHookApp(); dA#Q}.*r  
  // Overrides Q_1:tW &  
  // ClassWizard generated virtual function overrides s:?SF.  
  //{{AFX_VIRTUAL(CHookApp) +ndaLhj'  
 public: Y)1PB+  
  virtual BOOL InitInstance(); lvdf^b/ j  
  virtual int ExitInstance(); A8xvo/n$  
  //}}AFX_VIRTUAL P|^f0Rw3.  
  //{{AFX_MSG(CHookApp) 09|K>UC)v  
  // NOTE - the ClassWizard will add and remove member functions here. imo$-}A  
  // DO NOT EDIT what you see in these blocks of generated code ! #TeG-sFJg@  
  //}}AFX_MSG ]"r&]qx7  
  DECLARE_MESSAGE_MAP() 4hO!\5-w:  
}; V08?-Iz$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); gK_Ymq5>"M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,%6P0#-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C7XxFh  
BOOL InitHotkey(); oxC[F*mD  
BOOL UnInit(); tW.9yII  
#endif 26e]`]!SU  
i=ea ?eT`  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. {mm)ay|M  
#include "stdafx.h" Bz^jw>1b  
#include "hook.h" 5:\},n+VE  
#include <windowsx.h> 67VL@ ]  
#ifdef _DEBUG VQ"hUX8  
#define new DEBUG_NEW 8H;t_B  
#undef THIS_FILE ?TM ,Q  
static char THIS_FILE[] = __FILE__; XQ#;Zs/l  
#endif P !AEf#1  
#define MAX_KEY 100 3("_Z%  
#define CTRLBIT 0x04 y.anl  
#define ALTBIT 0x02 lyIl-!|  
#define SHIFTBIT 0x01 eds o2  
#pragma data_seg("shareddata") kv]~'Srk  
HHOOK hHook =NULL; Z"Zmo>cV4  
UINT nHookCount =0; 3Ko/{f  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey +Um( h-;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT *e<[SZzYZ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey //*fSF   
static int KeyCount =0; o#;b  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift t,QyfN  
#pragma data_seg() DD7h^-x  
HINSTANCE hins; ]}*R|1  
void VerifyWindow(); IW>T}@ |  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) _?<|{O  
//{{AFX_MSG_MAP(CHookApp) 7zA'ri3w  
// NOTE - the ClassWizard will add and remove mapping macros here. 8R2QZXJb-  
// DO NOT EDIT what you see in these blocks of generated code! 5BWH-2HsB  
//}}AFX_MSG_MAP >5_2_Y$"  
END_MESSAGE_MAP() "/)#O~  
a<@1 -j<  
CHookApp::CHookApp() ztnFhJ<a$  
{ MPCBT!o4Z  
 // TODO: add construction code here, 2K< 8  
 // Place all significant initialization in InitInstance }d&_q7L@@6  
} %9w::hav  
C^3 <={  
CHookApp theApp; O#b6mKPt;t  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0QFS  
{ zxMX Xm;  
 BOOL bProcessed=FALSE; ^2+yHw  
 if(HC_ACTION==nCode) ,">]`|?  
 { 7_%"BVb"  
  if((lParam&0xc0000000)==0xc0000000){// Key up RzxNbeki[W  
   switch(wParam) ;P;-}u  
   { =V-A@_^!c  
    case VK_MENU: a,xycX:U  
     MaskBits&=~ALTBIT; uH/J]zKR  
     break; Z&#('Z  
    case VK_CONTROL: 0M*Z'n +  
     MaskBits&=~CTRLBIT; S\4tzz @  
     break; B&\IGWG(  
    case VK_SHIFT: Z LB4m`  
     MaskBits&=~SHIFTBIT; OPwtV9%  
     break; Z?}dq-Vh&  
    default: //judge the key and send message 'w!Cn>  
     break; FQm`~rA~zt  
   } >go,K{cK6  
   for(int index=0;index<MAX_KEY;index++){ <L`KzaA  
    if(hCallWnd[index]==NULL) `2'#! -  
     continue; SFO({w(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RzBF~2 >i  
    { _XG/Pp)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); XDsx3Ws  
     bProcessed=TRUE; H!?c\7adX  
    } U@g4w!$r  
   } !HrKXy 0{  
  } l9}3XI.=  
  else if((lParam&0xc000ffff)==1){ //Key down }&/o'w2wY  
   switch(wParam) t5[ #x4 p  
   { ;fsZ7k4]do  
    case VK_MENU: &7<TAo;O  
     MaskBits|=ALTBIT; `JOOnTenQ  
     break; yXz*5W_0D  
    case VK_CONTROL: mX_a^_[G  
     MaskBits|=CTRLBIT; ^.KwcXr  
     break; GYJ80k|  
    case VK_SHIFT: MJOz.=CbhR  
     MaskBits|=SHIFTBIT; *#E F sUw  
     break; cU;iUf  
    default: //judge the key and send message }M1`di4e  
     break; rQk<90Ar  
   } * vflscgt  
   for(int index=0;index<MAX_KEY;index++) _I:~@  
   { NYE` Kin-  
    if(hCallWnd[index]==NULL) hHN'w73z  
     continue; PRr2F-!P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J!0DR4=Xi  
    { !6BW@GeF]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); :ZTc7 }  
     bProcessed=TRUE; :axRoRg  
    } xGu r  
   } PfreAEv,  
  } Nd`%5%'::  
  if(!bProcessed){ !;0U,!WI  
   for(int index=0;index<MAX_KEY;index++){ 9  TvV=  
    if(hCallWnd[index]==NULL) -}=i 04^  
     continue; Rec6c&5_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }v Z+A  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ' qWALu  
   } m5L-67[sB  
  } G"\`r* O  
 } 4xk|F'6K  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); uv=.2U46  
} } E0,z  
.Si,dc\  
BOOL InitHotkey() *FC=X)_&W  
{ P\w\N2  
 if(hHook!=NULL){ eCN })An  
  nHookCount++; =+ytTQc*ot  
  return TRUE; f47Od-\-  
 } |K6REkzr  
 else |<#{"'/=  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 2Or'c`|  
  if(hHook!=NULL) whpfJNz  
   nHookCount++; ,RJtm%w  
  return (hHook!=NULL); /a^1_q-bX  
} fBalTk;G{U  
BOOL UnInit() z8QAo\_I(  
{ :|_'fNd+!  
 if(nHookCount>1){ &=#[(vl  
  nHookCount--; >_o}  
  return TRUE; &QDW9 Mi  
 } E_k$W5  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 'SCidN(n  
 if(unhooked==TRUE){ ~Q?a|mV,  
  nHookCount=0; WOQP$D9  
  hHook=NULL; Pf|siC^;s~  
 } QrfG^GID  
 return unhooked; 'qjeXqGH$  
} JQV%fTHS  
LA@w:Fg  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "]z-: \ V  
{ <%maDM^_\(  
 BOOL bAdded=FALSE; 1abtgDL  
 for(int index=0;index<MAX_KEY;index++){ fJ/e(t  
  if(hCallWnd[index]==0){ ~MS\  
   hCallWnd[index]=hWnd; w9NHk~LHKF  
   HotKey[index]=cKey; ux_Mrh'  
   HotKeyMask[index]=cMask; ?**+e%$$  
   bAdded=TRUE; eln&]d;  
   KeyCount++; q8s0AN'@t'  
   break; O J/,pLYu  
  } Ko;{I?c  
 } 0}$Hi  
 return bAdded; CACTE  
} Cg&e(  
hvA^n@nr  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lz"OC<D}(  
{ BlXB7q,  
 BOOL bRemoved=FALSE; }RmU%IYc  
 for(int index=0;index<MAX_KEY;index++){ kD*2~Z?;  
  if(hCallWnd[index]==hWnd){ Ys@}3\Mc  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ an|x$e7|?  
    hCallWnd[index]=NULL; sA'6ty  
    HotKey[index]=0; --HF8_8;'  
    HotKeyMask[index]=0; c.,2GwW  
    bRemoved=TRUE; NXNY"r7~  
    KeyCount--; ^zt-HDBR_  
    break; I3,= 0z  
   } @r#v[I  
  } .Jt[(;  
 } $/.zm; D  
 return bRemoved; lD"(MQV@0  
} uM_#  
iTag+G4*  
void VerifyWindow() "kMguK}c  
{ wm)#[x #  
 for(int i=0;i<MAX_KEY;i++){ bKrhIU[  
  if(hCallWnd!=NULL){ D+]a.& {p  
   if(!IsWindow(hCallWnd)){ cgm81+[%r  
    hCallWnd=NULL; gA:5M  
    HotKey=0; ZHGC6a!a  
    HotKeyMask=0; )=AHf?hn  
    KeyCount--; b!sRk@LGZ  
   } :lB=L r)  
  } 6 G3\=)  
 } fcNL$U&-,i  
} .2>p3|F  
>p.O0G gg  
BOOL CHookApp::InitInstance() uoHNn7W  
{ %,D<O,N  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); &jsVw)Ue  
 hins=AfxGetInstanceHandle(); 7PANtCFb&  
 InitHotkey(); 4g : >[q  
 return CWinApp::InitInstance(); 5e$~)fL  
} q~3,yyu  
dl ~%MWAVb  
int CHookApp::ExitInstance() ?gJy3@D  
{ 0%m)@ukb  
 VerifyWindow(); $% 1vW=d  
 UnInit(); %n hm  
 return CWinApp::ExitInstance(); yto,>Utzg  
} f}1&HI8r  
(*oL+ef-C  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file l-ct?T_@  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) &_"]5/"(  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ]`&Yqg  
#if _MSC_VER > 1000 B x (uRj  
#pragma once ?Rj~f{%g  
#endif // _MSC_VER > 1000 hir4ZO%Zt  
\T <$9aNb  
class CCaptureDlg : public CDialog Gm(b/qDDe  
{ Kj<^zo%w  
 // Construction  ^}:#  
 public: 3'^k$;^  
  BOOL bTray; 6xZ=^;H  
  BOOL bRegistered; #|*F1K  
  BOOL RegisterHotkey(); ^4,a8`  
  UCHAR cKey; )hk   
  UCHAR cMask; tI7:5Cm  
  void DeleteIcon(); G3rj`Sg^c  
  void AddIcon(); JaK}|  
  UINT nCount; ,t`Kv1  
  void SaveBmp(); 0#ClWynjRO  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Eh|]i;G%  
  // Dialog Data 7vABq(  
  //{{AFX_DATA(CCaptureDlg) ( YQWbOk  
  enum { IDD = IDD_CAPTURE_DIALOG }; *,Za6.=  
  CComboBox m_Key; {%IExPJ  
  BOOL m_bControl; ,:??P1  
  BOOL m_bAlt;  w~ [b*$  
  BOOL m_bShift; f|R"u W +  
  CString m_Path; 'A:x/iv}^  
  CString m_Number; %K>.lh@  
  //}}AFX_DATA h=(DX5:A  
  // ClassWizard generated virtual function overrides F0:A]`|  
  //{{AFX_VIRTUAL(CCaptureDlg) 'k4E4OB  
 public: cOPB2\,  
  virtual BOOL PreTranslateMessage(MSG* pMsg); "dI;  
 protected: Sr%;fq  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }S3qBQTYL  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); O9g{+e`  
  //}}AFX_VIRTUAL $dA-2e1 0  
  // Implementation Q",0F{'  
 protected: v76D3'8  
  HICON m_hIcon; WHlYo5?  
  // Generated message map functions {; .T7dL  
  //{{AFX_MSG(CCaptureDlg) ^D<r  
  virtual BOOL OnInitDialog(); Ur5FC r  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam);  +QE^\a  
  afx_msg void OnPaint(); 1.gG^$Jd  
  afx_msg HCURSOR OnQueryDragIcon(); +3&z N(  
  virtual void OnCancel(); qA!]E^0*Ke  
  afx_msg void OnAbout(); ei6AV1| p  
  afx_msg void OnBrowse(); h;-yU.(w  
  afx_msg void OnChange(); T}4/0yR2  
 //}}AFX_MSG F35#dIs`&  
 DECLARE_MESSAGE_MAP() 2^)1N>"g  
}; ZeEWp3vW  
#endif ^;Sy. W&`  
8 O67  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file :_@JA0n  
#include "stdafx.h" UQ[B?jc  
#include "Capture.h" fm^@i;D  
#include "CaptureDlg.h" \TF!S"V  
#include <windowsx.h> %~jkB.\* )  
#pragma comment(lib,"hook.lib") <D::9c j  
#ifdef _DEBUG H_0/f8GwnG  
#define new DEBUG_NEW *FmTy|  
#undef THIS_FILE 8X I?  
static char THIS_FILE[] = __FILE__; P(;?kg}0  
#endif v$=QA:!U  
#define IDM_SHELL WM_USER+1 P0$e~=Q^4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,9P:Draxs`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ixV0|P8,c  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; r YF #^  
class CAboutDlg : public CDialog }=|!:kiE  
{ qY >{cjo  
 public: ?_v{| YI=  
  CAboutDlg(); V13BB44  
  // Dialog Data ** +e7k   
  //{{AFX_DATA(CAboutDlg) RGK8'i/X  
  enum { IDD = IDD_ABOUTBOX }; ^1wA:?uN}  
  //}}AFX_DATA r%e KFS  
  // ClassWizard generated virtual function overrides XfKo A0  
  //{{AFX_VIRTUAL(CAboutDlg) V~ TWKuR  
 protected: TO-nD>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \tRG1&{$%  
  //}}AFX_VIRTUAL e5OsI Vtjr  
  // Implementation sg8/#_S1i  
 protected: M{$j  
  //{{AFX_MSG(CAboutDlg) )LdyC`S\c  
  //}}AFX_MSG .-JCwnP  
  DECLARE_MESSAGE_MAP() Z(ZiFPx2Z  
}; ?]rPRV  
VOr1  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) PC qZNBN  
{ (D 9Su^:1  
 //{{AFX_DATA_INIT(CAboutDlg) $-&BB(-{E&  
 //}}AFX_DATA_INIT #_B-4sm  
} [y0O{,lI  
HBY.DCN[Z  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) sO5?aB&  
{ J -ePE7i  
 CDialog::DoDataExchange(pDX); o=RM-tR`v  
 //{{AFX_DATA_MAP(CAboutDlg) T2D<UhP  
 //}}AFX_DATA_MAP w ~ dk#=  
} .)+h H y  
}/,HM9Ke  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) *-12VIG'H  
 //{{AFX_MSG_MAP(CAboutDlg) 4:7V./" 9  
 // No message handlers  iL= m{  
 //}}AFX_MSG_MAP (o J9k[(  
END_MESSAGE_MAP() .c#y%S  
rS0DSGDq  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) VqE~c  
: CDialog(CCaptureDlg::IDD, pParent) TyKWy0x-3  
{ .^bft P\  
 //{{AFX_DATA_INIT(CCaptureDlg) 5qf BEPJ  
  m_bControl = FALSE; zvvP81$W  
  m_bAlt = FALSE; m{7^EF  
  m_bShift = FALSE; yi^b)2G  
  m_Path = _T("c:\\"); 'SYo_!  
  m_Number = _T("0 picture captured."); [|~2X>  
  nCount=0; 9z I.pv+]  
  bRegistered=FALSE; jAh2N3)  
  bTray=FALSE; 1.D-FPK  
 //}}AFX_DATA_INIT $HG}[XD?  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 N-g8}03  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ?DH"V7bs  
} '&99?s`u  
xcJ `1*1N  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) QW_agm  
{ kSc{^-<R  
 CDialog::DoDataExchange(pDX); ^ZM0c>ev=l  
 //{{AFX_DATA_MAP(CCaptureDlg) 2S8P}$mM  
  DDX_Control(pDX, IDC_KEY, m_Key); P"lBB8\eku  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ;Efcw[<  
  DDX_Check(pDX, IDC_ALT, m_bAlt); F3oQ^;xB  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); +f0~D(d!_  
  DDX_Text(pDX, IDC_PATH, m_Path); +x]9+D&  
  DDX_Text(pDX, IDC_NUMBER, m_Number); lc6i KFyG  
 //}}AFX_DATA_MAP h8 G5GRD  
} /j"sS2$U  
^>?CMcN4*  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) n}mR~YqD  
//{{AFX_MSG_MAP(CCaptureDlg) hCYQGx0  
 ON_WM_SYSCOMMAND() E(Rh#+]Y5  
 ON_WM_PAINT() =&dW(uyzY  
 ON_WM_QUERYDRAGICON() 7DKz;o  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) )s9',4$eK<  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) lZ&]|*>  
 ON_BN_CLICKED(ID_CHANGE, OnChange) AOp/d(vx5i  
//}}AFX_MSG_MAP UwY-7Mmo  
END_MESSAGE_MAP() ^2o dr \  
H +bdsk  
BOOL CCaptureDlg::OnInitDialog() idRD![!UI  
{ <?0~1o\Ur  
 CDialog::OnInitDialog(); 0lM{l?  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); jxgj,h"}9`  
 ASSERT(IDM_ABOUTBOX < 0xF000); GFk1/ F  
 CMenu* pSysMenu = GetSystemMenu(FALSE); O|cu.u|  
 if (pSysMenu != NULL) K={qU[_O  
 { OTB$V k  
  CString strAboutMenu; l$*=<tV  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Q{QYBh&  
  if (!strAboutMenu.IsEmpty()) I NSkgOo  
  { O;HY%  
   pSysMenu->AppendMenu(MF_SEPARATOR); GO! uwo:  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); fWGOP~0  
  } 3E^M?N2oc  
 } T88Y qI  
 SetIcon(m_hIcon, TRUE); // Set big icon QIB>rQCceo  
 SetIcon(m_hIcon, FALSE); // Set small icon IgL_5A  
 m_Key.SetCurSel(0); xKOq[d/8  
 RegisterHotkey(); Q 6C-4ja  
 CMenu* pMenu=GetSystemMenu(FALSE); XA_FOw!cX  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); +~nzii3  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); _U| 7'^|  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); M!M!Ni  
 return TRUE; // return TRUE unless you set the focus to a control = \ , qP  
} KyP)Qzp  
K3GSOD>  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ~9Cz6yF  
{ uk`8X`'  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) qIwV q!=  
 { fR-C0"c  
  CAboutDlg dlgAbout; p3^jGj@  
  dlgAbout.DoModal(); >i,iOx|E-  
 } %ICglF R  
 else )<4_:  
 { \nrP$  
  CDialog::OnSysCommand(nID, lParam); Q}A=jew  
 } aaWJ* >rJ  
} UFn8kBk  
3b[jwCt  
void CCaptureDlg::OnPaint() O$ !* %TL  
{ (y4#.vZh:  
 if (IsIconic()) eyw'7  
 { VY 1vXM3y  
  CPaintDC dc(this); // device context for painting qBk``!|s]  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); oCi ~P}r  
  // Center icon in client rectangle ,je`YEC  
  int cxIcon = GetSystemMetrics(SM_CXICON); P}3}ek1Ax  
  int cyIcon = GetSystemMetrics(SM_CYICON); GgFi9Ffj  
  CRect rect; 1D([@)^  
  GetClientRect(&rect); ~H@+D}J?  
  int x = (rect.Width() - cxIcon + 1) / 2; &[|VZ[  
  int y = (rect.Height() - cyIcon + 1) / 2; mjnUs-`W|  
  // Draw the icon HO|-@yOF^  
  dc.DrawIcon(x, y, m_hIcon); xcCl (M]+  
 } |E/L.gdP7  
 else 7_KhV  
 { %NHYW\sKX  
  CDialog::OnPaint(); N1--~e  
 } ES:!Vx9t0|  
} ;@4H5p  
GtI6[ :1t  
HCURSOR CCaptureDlg::OnQueryDragIcon() j,%EW+j$  
{ T*q"N?/4  
 return (HCURSOR) m_hIcon; !#D=w$@r:  
} bNzqls$  
}3/~x  
void CCaptureDlg::OnCancel() J>S3sP  
{ *ftC_v@p5  
 if(bTray) h!]"R<QQdu  
  DeleteIcon(); X.|Ygx  
  CDialog::OnCancel(); v1[_}N9f>H  
} 0^!Gib  
hY \{|  
void CCaptureDlg::OnAbout() nZvU 'k:  
{ J0<p4%Cf  
 CAboutDlg dlg; f5dR 5G  
 dlg.DoModal(); uOk%AL>  
} j^u[F"  
|DG@ht  
void CCaptureDlg::OnBrowse() +/'<z  
{ )q?$p9  
 CString str; z)L}ECZh9  
 BROWSEINFO bi; -]"T^w ib  
 char name[MAX_PATH]; 2 g`[u|  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); E)'8U  
 bi.hwndOwner=GetSafeHwnd(); }B!cv{{  
 bi.pszDisplayName=name; M?:\9DDd  
 bi.lpszTitle="Select folder"; r:l96^xs  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; oFg'wAO.  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); }N3`gCy9eN  
 if(idl==NULL) XdIah<F2  
  return; JAb$M{t  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); mA{#]Yvf1  
 str.ReleaseBuffer(); =&NOHT>  
 m_Path=str; a>Re^GT+z  
 if(str.GetAt(str.GetLength()-1)!='\\') *=nO  
  m_Path+="\\"; NtZ6$o<Y  
 UpdateData(FALSE); ,Q2N[Jwd$  
} w6,*9(;$Pk  
6&!l'[hU  
void CCaptureDlg::SaveBmp() *%- ?54B  
{ -Ds|qzrN%  
 CDC dc; m4**>!I  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 7!d$M{0"  
 CBitmap bm; {OxWcK\2@h  
 int Width=GetSystemMetrics(SM_CXSCREEN); C6k4g75U2  
 int Height=GetSystemMetrics(SM_CYSCREEN); Ee?;i<u  
 bm.CreateCompatibleBitmap(&dc,Width,Height); (:}<xxl  
 CDC tdc; zHFTCL>"  
 tdc.CreateCompatibleDC(&dc); Wvr+y!F  
 CBitmap*pOld=tdc.SelectObject(&bm); Xem| o&  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ofwQ:0@  
 tdc.SelectObject(pOld); qC j*>D  
 BITMAP btm; ep?:;98|t  
 bm.GetBitmap(&btm); 0$Ff#8  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; _g6wQdxT  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |zMqJ.qu  
 BITMAPINFOHEADER bih; jU$Y>S>l  
 bih.biBitCount=btm.bmBitsPixel; m "]!I~jd  
 bih.biClrImportant=0; AVpuMNd@  
 bih.biClrUsed=0; Ow3a0cF[9  
 bih.biCompression=0; ,C!n}+27  
 bih.biHeight=btm.bmHeight; kMS5h~D[  
 bih.biPlanes=1; eY3=|RR  
 bih.biSize=sizeof(BITMAPINFOHEADER); |!b9b(_j9  
 bih.biSizeImage=size; {})y^L  
 bih.biWidth=btm.bmWidth; ZlM_ m >,o  
 bih.biXPelsPerMeter=0; UX}*X`{  
 bih.biYPelsPerMeter=0; 3}4#I_<$F@  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @&:VKpu\  
 static int filecount=0; uX0 Bp8P  
 CString name; d^SE)/j  
 name.Format("pict%04d.bmp",filecount++); Qp69Sk@H{  
 name=m_Path+name; Y\8+}g;KR  
 BITMAPFILEHEADER bfh; \dNhzd#  
 bfh.bfReserved1=bfh.bfReserved2=0; "t+r+ipf])  
 bfh.bfType=((WORD)('M'<< 8)|'B'); N9*UMVU  
 bfh.bfSize=54+size; zlMlMyG4  
 bfh.bfOffBits=54; cs5ix"1A  
 CFile bf; 8nu> gA  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ hT=f;6$  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); *f*f&l%  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !rHx}n{rw  
  bf.WriteHuge(lpData,size); q] ZSj J  
  bf.Close(); syMm`/*/G-  
  nCount++; J{H?xc o  
 } 0Q3YN(  
 GlobalFreePtr(lpData); ?H0m<jO8~  
 if(nCount==1) >Fh#DmQ  
  m_Number.Format("%d picture captured.",nCount); 8_awMVAy  
 else ~h|m&XK+Q  
  m_Number.Format("%d pictures captured.",nCount); |$Xf;N37t  
  UpdateData(FALSE); XW:%vJu^`  
} R\ q):,  
{c?ymkK  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) X8.y4{5  
{ d"l}Ny)C  
 if(pMsg -> message == WM_KEYDOWN) y{;u@o?T  
 { KDaN-r^{%  
  if(pMsg -> wParam == VK_ESCAPE) - #Jj-t_Fe  
   return TRUE; ]c,l5u}A$  
  if(pMsg -> wParam == VK_RETURN) s<#N]mp'   
   return TRUE; ~._ko  
 } s?+fPOF  
 return CDialog::PreTranslateMessage(pMsg); f@*>P_t  
} u7 ~mn l  
cP('@K=p  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Wa}"SqYr h  
{ :5<#X8>d  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ .J:;_4x  
  SaveBmp(); #}j]XWy  
  return FALSE; Avd *~  
} X=#It&m%s  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ AA_@\: w^  
 CMenu pop; ywe5tU  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 2moIgJ   
 CMenu*pMenu=pop.GetSubMenu(0); 5"e+& zU~f  
 pMenu->SetDefaultItem(ID_EXITICON); F%y{% C7l  
 CPoint pt; QP<FCmt8  
 GetCursorPos(&pt); ?GfxBZWJ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 1::LN(`<  
 if(id==ID_EXITICON) mR!rn^<l  
  DeleteIcon(); lkN'uZ  
 else if(id==ID_EXIT) Q.>/*8R;  
  OnCancel(); 5d(qtFH1  
 return FALSE; ef,F[-2^o  
} Ki63Ox^O  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ^K/G5  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ofl'G]/$+  
 AddIcon(); >Ban?3{  
 return res; l)%mqW%  
} [Q=4P*G}X  
}eI`Qg  
void CCaptureDlg::AddIcon() lf;~5/%wMG  
{ b<8q 92F  
 NOTIFYICONDATA data; IF^[^^v+H  
 data.cbSize=sizeof(NOTIFYICONDATA); dGa@<hg  
 CString tip; %/X2 l  
 tip.LoadString(IDS_ICONTIP); }oV3EIH  
 data.hIcon=GetIcon(0); M-vC>u3Y  
 data.hWnd=GetSafeHwnd(); ^}tL nF  
 strcpy(data.szTip,tip); wyNC|P;j$g  
 data.uCallbackMessage=IDM_SHELL; =}"R5  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; "W3W:vl!  
 data.uID=98; 3 ^pYC K%  
 Shell_NotifyIcon(NIM_ADD,&data); :K: f^o]s  
 ShowWindow(SW_HIDE); jB`7T^bU  
 bTray=TRUE; a&8l[xe1  
} q'by;g*m  
XS3{R   
void CCaptureDlg::DeleteIcon() V15q01bE#  
{ # UjEY9"M  
 NOTIFYICONDATA data; .byc;9M%  
 data.cbSize=sizeof(NOTIFYICONDATA); [:Xn6)qz  
 data.hWnd=GetSafeHwnd(); ` v>/  
 data.uID=98; ?${V{=)*X'  
 Shell_NotifyIcon(NIM_DELETE,&data); 3 L*+8a  
 ShowWindow(SW_SHOW); \N6<BS  
 SetForegroundWindow(); 1x8(I&i  
 ShowWindow(SW_SHOWNORMAL); U>bP}[&S  
 bTray=FALSE;  &Q<EfB  
} Rnz8 f}  
yg`E22  
void CCaptureDlg::OnChange() /%-o.hT  
{ wXP_]-  
 RegisterHotkey(); Q})t<l+L  
} 3g^IXm:K$  
Q Xsfp  
BOOL CCaptureDlg::RegisterHotkey() +BU0 6lLD  
{ B*32D8t`u  
 UpdateData(); Ia=&.,xub  
 UCHAR mask=0; RFhU#  
 UCHAR key=0; gYRqqV  
 if(m_bControl) MPqY?KF  
  mask|=4; m9%yR"g9  
 if(m_bAlt)  {`tHJ|8  
  mask|=2; 4$ ..r4@  
 if(m_bShift) w4NZt|>5j;  
  mask|=1; |&9tU  
  key=Key_Table[m_Key.GetCurSel()]; PkjT&e)  
 if(bRegistered){ -6(h@F%E  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5sG ]3z+1  
  bRegistered=FALSE; ]aREQ?ma&z  
 } RA! x  
 cMask=mask; L,f^mX0<  
 cKey=key; D`1I;Tb#  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Y"r3i]  
 return bRegistered; GU2]/\W*a  
} o-L|"3 P  
^ b=5 6~[  
  四、小结 EPQ&?[6  
M4R%Gr,La  
  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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