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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: wW-Ab  
  Yx5J$!Ld  
  一、实现方法 WSQ[.C  
U^[<  
  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: *C\(wL  
e^ QVn\<c  
#pragma data_seg("shareddata") @g4Shlx|  
HHOOK hHook =NULL; //钩子句柄 !\^jt%e&  
UINT nHookCount =0; //挂接的程序数目 3:l DL2  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 9`B0fv Q&  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 XYe~G@Q Z  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ABc)2"i:*  
static int KeyCount =0; RlrZxmPV>O  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 id^|\hDR  
#pragma data_seg() 6 }!Z"  
pTWg m\h  
  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。 ,9mgYp2  
e 8,{|a  
  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: }!8nO;  
d<x1*a  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ;hwzYXWF  
cKey,UCHAR cMask) 3cqQL!Gm  
{ i'HPRY  
 BOOL bAdded=FALSE; :[xvlW29  
 for(int index=0;index<MAX_KEY;index++){ F.<L> G7{1  
  if(hCallWnd[index]==0){ bpW!iY/q3  
   hCallWnd[index]=hWnd; 7:>sc]Z  
   HotKey[index]=cKey; gE\b 982  
   HotKeyMask[index]=cMask; RvyuGU  
   bAdded=TRUE; O~27/  
   KeyCount++; QdDObqVdy  
   break; 9~c~E/4!  
  } 1"?]= j:  
 } >SoO4i8  
 return bAdded; /v|Onq1Y4  
} _1  p DA  
//删除热键 /Pvk),ca  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) nL+p~Hi  
{ yl$F~e1W  
 BOOL bRemoved=FALSE; GRT] aw  
 for(int index=0;index<MAX_KEY;index++){ q\R q!7(  
  if(hCallWnd[index]==hWnd){ */w7?QOv  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ydQ!4  
    hCallWnd[index]=NULL; wiJRCH  
    HotKey[index]=0; 5 6DoO'  
    HotKeyMask[index]=0; l$a?A[M$  
    bRemoved=TRUE; ! Z;T-3^.  
    KeyCount--; U\jb"  
    break; #op:/j  
   } fN)x#?  
  } o@W_ai_  
 } mu[Op*)  
 return bRemoved; SO;N~D1Z6  
} 2no$+4+z  
o5swH6Y.)J  
iA'As%S1  
  DLL中的钩子函数如下: byGn,m  
m`y9Cuk  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) S`m,S4-eD  
{ j13DJ.xu  
 BOOL bProcessed=FALSE; R>2IRvY(  
 if(HC_ACTION==nCode) 9 |.Ao  
 { 6Ps.E  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ?59'dGnz_  
   switch(wParam) Zw{MgoJ0Z  
   {  "uKFOV?j&  
    case VK_MENU: B+] D5K  
     MaskBits&=~ALTBIT; E!J=8C.:  
     break; 8#X_#  
    case VK_CONTROL: PLA#!$c7q  
     MaskBits&=~CTRLBIT; rp's  
     break; m\ S\3n  
    case VK_SHIFT: JoZ(_Jh%m  
     MaskBits&=~SHIFTBIT; *fnvZw?  
     break;  $dQIs:  
    default: //judge the key and send message mR% FqaN_  
     break; E{y1S\7K  
   } <*(^{a. O  
   for(int index=0;index<MAX_KEY;index++){ :,S98z#  
    if(hCallWnd[index]==NULL) z.oU4c  
     continue; .[:VSM7T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8{0k0 &x  
    { :Q_3hK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %S@L|t  
     bProcessed=TRUE; M`7y>Ud  
    } bgF^(T35  
   } lnh+a7a)  
  } 'yY>as  
  else if((lParam&0xc000ffff)==1){ //有键按下 '<dgT&8C  
   switch(wParam) R)5n 8  
   { !GwL,)0@^  
    case VK_MENU: mchJmZ{A  
     MaskBits|=ALTBIT; J?&l*_m;t  
     break; V'G Ju  
    case VK_CONTROL: CMW,slC_3  
     MaskBits|=CTRLBIT; DyO$P#~?  
     break; G2:%g(  
    case VK_SHIFT: DinPxtT?a  
     MaskBits|=SHIFTBIT; 9\JQ7$B  
     break; SA;#aj}rV  
    default: //judge the key and send message Y?K{(szo ?  
     break; xY<{qHcX  
   } upy\gkpnGO  
   for(int index=0;index<MAX_KEY;index++){ //f  
    if(hCallWnd[index]==NULL) t2>fmQIQ  
     continue; 7Nzbz3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) % 0T+t.  
    { #_i`#d)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -/P\"c  
     bProcessed=TRUE; .}B(&*9,v  
    } X4|4QgY  
   } x=q;O+7]  
  } ~" i0x  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 1} %B%*N  
   for(int index=0;index<MAX_KEY;index++){ T/1gI9 X  
    if(hCallWnd[index]==NULL) rl08 R  
     continue; pkgjTXR2b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) lIRlMLuG  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |7k_N|E  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 J h&~ToF!  
   } qS| \JG  
  } T>`74B:  
 } QHq,/kWY  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 72W s K"  
} O%8EZyu  
a^U~0i@[S  
  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: ~;]W T  
nkfZiyx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); l{j~Q^U})  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); V)(R]BK{  
AlXNg!j;5K  
  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: J aTp} #  
457\&  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) kF"@Ngv.  
{ n+;6=1d7ZW  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 'Ft0Ry<OL  
 { vw,rF`LjZ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 p Z: F:  
  SaveBmp(); TS2ZF{m  
  return FALSE; @Fp_^5  
 } EJ@p-}I!  
 …… //其它处理及默认处理 4db(<h  
} *z*uEcitW  
j>-gO,v, y  
!8NC# s  
  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。 )G^ KDj"  
="wzq+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。 y*pUlts<  
l*\y  
  二、编程步骤 PYbVy<xc  
i0$Bx>  
  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"; Q/>{f0  
C CBfKp  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; #S&Tkip]"W  
/DQaGq/Ld  
  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; 2'EUy@0  
jB{4\)  
  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; hd),&qoW?  
u! "t!2I  
  5、 添加代码,编译运行程序。 _8Kx6s%  
NS%WeAf  
三、程序代码 (bsXo q  
n8*;lK8  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL "j;4 k.`h  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) )M6w5g  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Q8!) !r%  
#if _MSC_VER > 1000 $hivlI-7Ko  
#pragma once 4RSHZAJg  
#endif // _MSC_VER > 1000 OQW#a[=WQ  
#ifndef __AFXWIN_H__ e/0<[s*#Q  
#error include 'stdafx.h' before including this file for PCH M`rl!Ci#  
#endif qlL`jWJ  
#include "resource.h" // main symbols TT =b79k  
class CHookApp : public CWinApp ]E\n9X-{  
{ ;;L[e]Z  
 public: 1 $/%m_t  
  CHookApp(); }:X*7 n(&  
  // Overrides S S2FTb-m  
  // ClassWizard generated virtual function overrides &|f@$ff  
  //{{AFX_VIRTUAL(CHookApp) 8GvJ0Jq}U  
 public: rM'=_nmi  
  virtual BOOL InitInstance(); xx[9~z=d  
  virtual int ExitInstance(); ZI=%JU(  
  //}}AFX_VIRTUAL "@?? Fw!  
  //{{AFX_MSG(CHookApp) *h}XWBC1q  
  // NOTE - the ClassWizard will add and remove member functions here. uV!^,,~  
  // DO NOT EDIT what you see in these blocks of generated code ! Q09[[  
  //}}AFX_MSG E_vq  
  DECLARE_MESSAGE_MAP() H&:jcgV*P  
}; U2bjFLd"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); cWoPB _  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \v'p/G)g  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !%"8|)CAr  
BOOL InitHotkey(); "jG}B.l=,  
BOOL UnInit(); G6T_O  
#endif xuqv6b.  
a)wJT`xu  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. .zi_[  
#include "stdafx.h"  o4|M0  
#include "hook.h" E[/\7 v\  
#include <windowsx.h> SQX:7YF~  
#ifdef _DEBUG N<~t3/Nm  
#define new DEBUG_NEW Ney/[3 A  
#undef THIS_FILE 8C*c{(4  
static char THIS_FILE[] = __FILE__; SHe49!RA'{  
#endif ^s|6vd;PD=  
#define MAX_KEY 100 Pi]19boM.  
#define CTRLBIT 0x04 xai*CY@cQ  
#define ALTBIT 0x02 _f$^%?^  
#define SHIFTBIT 0x01 a!=D[Gz*5  
#pragma data_seg("shareddata") BO;6 u^[  
HHOOK hHook =NULL; ;7} VBkH  
UINT nHookCount =0; Zl^\Q=*s  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey etTn_v  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT r>o63Q:  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey  #"@|f  
static int KeyCount =0; *MKO I'  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift OCNQvF~  
#pragma data_seg() G"h'_7  
HINSTANCE hins; o,_? ^'@  
void VerifyWindow(); < jJ  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) OX\A|$GS  
//{{AFX_MSG_MAP(CHookApp) 3yVMXK  
// NOTE - the ClassWizard will add and remove mapping macros here. wOU_*uY@6'  
// DO NOT EDIT what you see in these blocks of generated code! kM,C3x{A  
//}}AFX_MSG_MAP 9[<)WQe6M  
END_MESSAGE_MAP() RW<D<5C  
<g"{Wv: h  
CHookApp::CHookApp() Y$"O VC  
{ bbE!qk;hEP  
 // TODO: add construction code here, U~:-roQ(\  
 // Place all significant initialization in InitInstance 17%Mw@+  
} P GqQ@6B  
Gefne[  
CHookApp theApp; 5>[u `  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Z&1\{PG3*  
{ qm/)ku0  
 BOOL bProcessed=FALSE; ,U2*FZ["  
 if(HC_ACTION==nCode) 'Gj3:-xqL  
 { 9Z4nAc  
  if((lParam&0xc0000000)==0xc0000000){// Key up ]n6#VTz*  
   switch(wParam) ]s<[D$ <,  
   { OCe!.`  
    case VK_MENU: fU/>z]K  
     MaskBits&=~ALTBIT; )Y"+,$$>Y`  
     break; EV]1ml k$  
    case VK_CONTROL: hgPa6Kd  
     MaskBits&=~CTRLBIT; ;ub;l h3  
     break; V<GHpFi0  
    case VK_SHIFT: X $jWo@  
     MaskBits&=~SHIFTBIT; IxY|>5z  
     break; b,7k)ND1F  
    default: //judge the key and send message EJMM9(DQ7  
     break; =;Au<|  
   } `dq,>HdW  
   for(int index=0;index<MAX_KEY;index++){ MTuV^0%jD  
    if(hCallWnd[index]==NULL) NPy&OcRl  
     continue; rC5 p-B%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,E S0NA  
    { C5o#i*|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Y]'Z7<U}*E  
     bProcessed=TRUE; Va"0>KX  
    } <^#,_o,!  
   } ;U/&I3dzV  
  } ag [ZW  
  else if((lParam&0xc000ffff)==1){ //Key down akp-zn&je  
   switch(wParam) =$'6(aDH  
   { :CG`t?N9M  
    case VK_MENU: |d{PA.@33  
     MaskBits|=ALTBIT; p`olCp'  
     break; y0L_"e/  
    case VK_CONTROL: c"f-3kFv  
     MaskBits|=CTRLBIT; 6' k<+IR  
     break; b RFLcM  
    case VK_SHIFT: y%"{I7!A  
     MaskBits|=SHIFTBIT; XP!S$Q]D  
     break; mE+*)gb:Rd  
    default: //judge the key and send message ~Y^+M*   
     break; Sc]B#/~B  
   } +}Dw3;W}m  
   for(int index=0;index<MAX_KEY;index++) \ 2M_\Q`NY  
   { |jGf<Bf5  
    if(hCallWnd[index]==NULL) IaSR;/  
     continue; <FV1Wz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) G#ZH.24Y  
    { <sb~ ^B  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); }bb;~  
     bProcessed=TRUE; T<n  
    } Acez'@z  
   } b/+u4'"  
  } G/)O@Ugp  
  if(!bProcessed){ 6AAz  
   for(int index=0;index<MAX_KEY;index++){ BtkOnbz8X  
    if(hCallWnd[index]==NULL) 3#3n!(  
     continue; `V}q-Zdy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) t% d Z-Ym  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); r8`ffH  
   } |mZxfI  
  } Ytn9B}%o  
 } xG~P+n7t5$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Z9v31)q(  
} 01 }D,W`  
hNC&T`.-~B  
BOOL InitHotkey() g|o,uD  
{ qU \w=  
 if(hHook!=NULL){ Q *D;U[  
  nHookCount++; qqjwJ!@P  
  return TRUE; `+]Qz =}  
 } (p"%O  
 else 4>wP7`/+y  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); OIGY`   
  if(hHook!=NULL) Zu*F#s!tUI  
   nHookCount++; m+ =] m_  
  return (hHook!=NULL); 8SMxw~9$  
} {5Q!Y&N.%  
BOOL UnInit() E^ B'4  
{ L^1NY3=$  
 if(nHookCount>1){ ( >LF(ll  
  nHookCount--; ?tWaI{95I  
  return TRUE; 1KU! tL  
 } )v'WWwXY>  
 BOOL unhooked = UnhookWindowsHookEx(hHook); l0|5t)jF-  
 if(unhooked==TRUE){ LP.]9ut  
  nHookCount=0; .yoH/2h  
  hHook=NULL; k$n|*kCh  
 } /J]5H  
 return unhooked; 0Um2DjTCG  
} d-oMQGOklb  
!Jo_"#5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]vAz  
{ t*p71U4+I  
 BOOL bAdded=FALSE; tR# OjkvX  
 for(int index=0;index<MAX_KEY;index++){ '+@=ILj>  
  if(hCallWnd[index]==0){ &T#;-`'  
   hCallWnd[index]=hWnd; $zUP?Gq!  
   HotKey[index]=cKey; KqHyG  
   HotKeyMask[index]=cMask; em y[k  
   bAdded=TRUE; bTI|F]^!  
   KeyCount++; ?e%ZOI  
   break; lt/1f{v[:  
  } p'Y^ X  
 } [F+}V,  
 return bAdded; 'lH|eU&-  
} Ugr!"Q#M  
% aP!hy  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0- B5`=yU  
{ 9=s<Ld  
 BOOL bRemoved=FALSE; ko!)s  
 for(int index=0;index<MAX_KEY;index++){ kXViWOXU^  
  if(hCallWnd[index]==hWnd){ EfqX y>W  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [CY9^N  
    hCallWnd[index]=NULL; &eJfGt5  
    HotKey[index]=0; pJ>P[  
    HotKeyMask[index]=0; &j;wCvE4+  
    bRemoved=TRUE; ,>:U2%  
    KeyCount--; 2_>N/Z4T  
    break; {4l8}w  
   } 91/Q9xY  
  } Q1Kfi8h}'  
 } Xu{1".\  
 return bRemoved; z[ N`s$;  
} =0 #O U  
11NQR[  
void VerifyWindow() 9p]QM)M  
{ HVRZ[Y<^  
 for(int i=0;i<MAX_KEY;i++){ Usvl}{L[  
  if(hCallWnd!=NULL){ d z|or9&  
   if(!IsWindow(hCallWnd)){ 28-RC>,@}  
    hCallWnd=NULL; {$oj.V 4  
    HotKey=0; <NMEGit  
    HotKeyMask=0; b 1c y$I  
    KeyCount--; j/DzCcp7  
   } )+#` CIv  
  } H8=N@l  
 } IW5,7.  
} yWmJ~/*lG  
e[1hz_v  
BOOL CHookApp::InitInstance() nkPh,X\N0  
{ =F|{# F  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); I{|O "8  
 hins=AfxGetInstanceHandle(); Cp\6W[2+B  
 InitHotkey(); poE0{HOU  
 return CWinApp::InitInstance(); hW<%R]^|  
} #<fRE"v:Q  
ZtNN<7  
int CHookApp::ExitInstance() (g]!J_Z"  
{ 8\^R~K`sY  
 VerifyWindow(); Xg6Jh``  
 UnInit(); JtE M,tK  
 return CWinApp::ExitInstance(); G/E+L-N#`  
} }:zE< bK  
p T?}Kc  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file hE{K=Tz$  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_)  m!!/Za  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ X0HZH?V+  
#if _MSC_VER > 1000 g&L!1<, p  
#pragma once 70?\ugxA  
#endif // _MSC_VER > 1000 Z-%\ <zT  
ic:zsuEm  
class CCaptureDlg : public CDialog b`Zx!^  
{ lf|FWqqV  
 // Construction s S+MqBh&I  
 public: 'ms-*c&  
  BOOL bTray; &ANf!*<\E  
  BOOL bRegistered; b=C*W,Q_#  
  BOOL RegisterHotkey(); zpn9,,~u  
  UCHAR cKey; , >a&"V^k  
  UCHAR cMask; fgTg7 m  
  void DeleteIcon(); ^e,.  
  void AddIcon(); RNk\.}m  
  UINT nCount; kt#fMd$  
  void SaveBmp(); u[;\y|75  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor NWESP U):w  
  // Dialog Data 0D.Mke )  
  //{{AFX_DATA(CCaptureDlg) >Er|Jxy  
  enum { IDD = IDD_CAPTURE_DIALOG }; c^xIm'eob  
  CComboBox m_Key; I9A~Ye 5O&  
  BOOL m_bControl; 6_o*y8s.  
  BOOL m_bAlt; 5vQHhwO50k  
  BOOL m_bShift; s[>,X#7 y  
  CString m_Path; mthA4sz  
  CString m_Number; n&4N[Qlv,  
  //}}AFX_DATA CZwXTHe  
  // ClassWizard generated virtual function overrides XX TL..  
  //{{AFX_VIRTUAL(CCaptureDlg) 5{WE~8$  
 public: UW={[h{.|@  
  virtual BOOL PreTranslateMessage(MSG* pMsg); @D[_}JE  
 protected: Y1\}5k{>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &&8x%Pml  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); !qQl@j O  
  //}}AFX_VIRTUAL eS^7A}*wd-  
  // Implementation |*xA 8&/  
 protected: L<cx:Vz  
  HICON m_hIcon; k9R4Y\8P  
  // Generated message map functions NN{?z!  
  //{{AFX_MSG(CCaptureDlg) tKuwpT1Qc  
  virtual BOOL OnInitDialog(); "S]0  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); X,% 0/6*]  
  afx_msg void OnPaint(); 4"(Bu/24  
  afx_msg HCURSOR OnQueryDragIcon(); EWhK0Vej=  
  virtual void OnCancel(); 9rX&uP)j^#  
  afx_msg void OnAbout(); $99n&t$Y  
  afx_msg void OnBrowse(); oCv.Ln1;Z  
  afx_msg void OnChange(); t>RY7C;PuS  
 //}}AFX_MSG C==hox7b  
 DECLARE_MESSAGE_MAP() M<Ncb   
}; QVT5}OzMt  
#endif @i_FTN  
jRlYU`?  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Ml{,  
#include "stdafx.h" p`dU2gV  
#include "Capture.h" 2a)xTA#  
#include "CaptureDlg.h" s\(k<Ks  
#include <windowsx.h> |^I0dR/w:  
#pragma comment(lib,"hook.lib")  _"yh.N&  
#ifdef _DEBUG pU}(@oy  
#define new DEBUG_NEW &t@jl\ND  
#undef THIS_FILE S3%FHS  
static char THIS_FILE[] = __FILE__;  -);Wfs  
#endif \:'/'^=#|  
#define IDM_SHELL WM_USER+1 Rok7n1gW  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); UgSB>V<?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Xl{P8L  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; HRCT }  
class CAboutDlg : public CDialog 558V_y:  
{ I_#kgp  
 public: ^/>(6>S^M  
  CAboutDlg(); x+:UN'"r  
  // Dialog Data mDABH@ R  
  //{{AFX_DATA(CAboutDlg) {4}yKjW%z  
  enum { IDD = IDD_ABOUTBOX }; n,(sBOQ  
  //}}AFX_DATA =ho}oL,ZO  
  // ClassWizard generated virtual function overrides wssRA?9<  
  //{{AFX_VIRTUAL(CAboutDlg) 4he GnMD  
 protected: Zn+.;o)E<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %XDc,AR[  
  //}}AFX_VIRTUAL HZB>{O  
  // Implementation P )"m0Lu<  
 protected: 2;`1h[,-^  
  //{{AFX_MSG(CAboutDlg) b5I I/Y  
  //}}AFX_MSG )9G[dDeC  
  DECLARE_MESSAGE_MAP() N)|yu1S  
}; 6<SAa#@ey  
^7cGq+t  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) \ZFGw&yN  
{ kx{{_w  
 //{{AFX_DATA_INIT(CAboutDlg) `2WFk8) F  
 //}}AFX_DATA_INIT @V sG'  
} ZY={8T@  
<?6|.\&  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #U4F0BdA  
{ Gr'  CtO  
 CDialog::DoDataExchange(pDX); bHYy}weZ  
 //{{AFX_DATA_MAP(CAboutDlg) X/!o\yyT  
 //}}AFX_DATA_MAP @f~RdO3  
} wE>\7a*P%  
iL&fgF"'  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 6r0krbN  
 //{{AFX_MSG_MAP(CAboutDlg) ~ "H,/m%2o  
 // No message handlers {SPq$B_VR  
 //}}AFX_MSG_MAP )p0^zv{  
END_MESSAGE_MAP() l`{\"#4  
= `F(B  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) IB"w&sBy  
: CDialog(CCaptureDlg::IDD, pParent) L(<*)No  
{ #e1>H1eU  
 //{{AFX_DATA_INIT(CCaptureDlg) z&)A,ryW0  
  m_bControl = FALSE; . B9iLI  
  m_bAlt = FALSE; LVfF[  
  m_bShift = FALSE; Ecefi pG  
  m_Path = _T("c:\\"); &K.d'$q  
  m_Number = _T("0 picture captured."); ]L $\ #  
  nCount=0; 3?9IJ5p  
  bRegistered=FALSE; A]0 St@  
  bTray=FALSE; K~{$oD7!  
 //}}AFX_DATA_INIT AaOu L,l  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 F?*-4I-  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ,/%=sux  
} |Q6.299  
*8Xh(` Mj7  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ~O0 $Suv  
{ y/{fX(aV  
 CDialog::DoDataExchange(pDX); cWaSn7p!X  
 //{{AFX_DATA_MAP(CCaptureDlg) I\{ 1u  
  DDX_Control(pDX, IDC_KEY, m_Key); XGWSdPJLr  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 9'giU r  
  DDX_Check(pDX, IDC_ALT, m_bAlt);  a=9:[  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); W?R6ZAn  
  DDX_Text(pDX, IDC_PATH, m_Path); 4<Utmr  
  DDX_Text(pDX, IDC_NUMBER, m_Number); w^|*m/h|@u  
 //}}AFX_DATA_MAP VcO0sa f`  
} 61>.vT8P  
EStB#V^  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) g`' !HGY  
//{{AFX_MSG_MAP(CCaptureDlg) oXh#a8  
 ON_WM_SYSCOMMAND() C.yQ=\U2  
 ON_WM_PAINT() HGs $*  
 ON_WM_QUERYDRAGICON() 2B[X,rL.pX  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) f!uwzHA`?  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) TH&U j1  
 ON_BN_CLICKED(ID_CHANGE, OnChange) _Xc8Yg }`  
//}}AFX_MSG_MAP :Zbg9`d*  
END_MESSAGE_MAP() jh%Eq+#S  
x(6SG+Kr  
BOOL CCaptureDlg::OnInitDialog() Smn;(K  
{ A@[o;H}XP  
 CDialog::OnInitDialog(); @ $ ;q ;  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ]d0BN`*U.  
 ASSERT(IDM_ABOUTBOX < 0xF000); #ym'AN  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 5y [Oj^  
 if (pSysMenu != NULL) X ::JV7hu  
 { x7&B$.>3  
  CString strAboutMenu; @s;;O\  
  strAboutMenu.LoadString(IDS_ABOUTBOX); H?vdr:WlTN  
  if (!strAboutMenu.IsEmpty()) FEz-+X<q2  
  { 3 *"WG O5  
   pSysMenu->AppendMenu(MF_SEPARATOR); {0wIR_dGX  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); DS(}<HK{  
  } l'-Bu(  
 } s4y73-J^.v  
 SetIcon(m_hIcon, TRUE); // Set big icon zm5]J  
 SetIcon(m_hIcon, FALSE); // Set small icon wx= $2N6  
 m_Key.SetCurSel(0); ?}tFN_X"  
 RegisterHotkey(); *=/ { HvJ  
 CMenu* pMenu=GetSystemMenu(FALSE); +US!YU  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); |&+ o^  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); W.f/pu  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 9}!qR|l3nR  
 return TRUE; // return TRUE unless you set the focus to a control \^J%sf${  
} (&F}/s gbi  
XH4  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) %+W{iu[|  
{ |^"1{7)  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) )Xz,j9GzJS  
 { JxdDC^> 0  
  CAboutDlg dlgAbout; s 8jV(P(O  
  dlgAbout.DoModal(); 7hD>As7`/  
 } _ @NL;w:!  
 else kzQ+j8.,U  
 { X; \+<LE  
  CDialog::OnSysCommand(nID, lParam); a od-3"7[  
 } |}s*E_/[  
} b.JuI  
VK\X&Y3l  
void CCaptureDlg::OnPaint() jKAEm  
{ DZ'P@f)]  
 if (IsIconic()) {0Yf]FQb-a  
 { y*jp79G  
  CPaintDC dc(this); // device context for painting jjB~G^n  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); m<T%Rb4?@  
  // Center icon in client rectangle O~#!l"0 L+  
  int cxIcon = GetSystemMetrics(SM_CXICON); Q0`wt.}V2  
  int cyIcon = GetSystemMetrics(SM_CYICON); / |;RV"  
  CRect rect; _lJ!R:*  
  GetClientRect(&rect); 17%,7P9pg  
  int x = (rect.Width() - cxIcon + 1) / 2; >reU#j  
  int y = (rect.Height() - cyIcon + 1) / 2; /$xU  
  // Draw the icon VX0 %a@ur  
  dc.DrawIcon(x, y, m_hIcon); WTQ\PANAaR  
 } 8`B3;Zmm  
 else sQHv%]s 0  
 { p SH=%u>  
  CDialog::OnPaint(); F3[T.sf  
 } ^+>laOzC`8  
} T\6dm/5  
O'p9u@kc  
HCURSOR CCaptureDlg::OnQueryDragIcon() 7 UKh688  
{ ?|\ER#z  
 return (HCURSOR) m_hIcon; MC&` oX[  
}  c(f  
B?gOHG*vd>  
void CCaptureDlg::OnCancel() 6RU~"C  
{ >^?u .gM3  
 if(bTray) `t>l:<@%  
  DeleteIcon(); ~~/|dh5  
  CDialog::OnCancel(); 9IdA%RM~mH  
} \$~|ZwV{  
$t'MSlF  
void CCaptureDlg::OnAbout() y4 #>X  
{ "rALt~AX  
 CAboutDlg dlg; b4%??"&<Y  
 dlg.DoModal(); W s3)gvpPA  
} S:#lH?<_  
13$%,q)  
void CCaptureDlg::OnBrowse() u OmtyX  
{ hlvK5Z   
 CString str; Jc&{`s^Nu  
 BROWSEINFO bi; Fj8z  
 char name[MAX_PATH]; v|_K/|  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); q"CVcLi9  
 bi.hwndOwner=GetSafeHwnd(); \"w"$9o6  
 bi.pszDisplayName=name; T$)^gHS  
 bi.lpszTitle="Select folder"; r..iko]T  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; *2>&"B09`  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ;>U2|>5V  
 if(idl==NULL) D# 9m\o_  
  return; ?um;s-x)  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); wy<S;   
 str.ReleaseBuffer(); dK$XNi13.5  
 m_Path=str; %OL$57Ia  
 if(str.GetAt(str.GetLength()-1)!='\\') 6##_%PO<m  
  m_Path+="\\"; #X+JHl  
 UpdateData(FALSE); T8?Ghbn  
} Pf")e,u$  
<6%?OJhp  
void CCaptureDlg::SaveBmp() 58}U^IW  
{ 6IN e@  
 CDC dc; wQ:)KjhHH  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); +[6G5cH  
 CBitmap bm; /wGM#sFH  
 int Width=GetSystemMetrics(SM_CXSCREEN); 5zK4Fraf  
 int Height=GetSystemMetrics(SM_CYSCREEN); K(e$esLs-  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 1SQ3-WU s  
 CDC tdc; Ljm[?*H#  
 tdc.CreateCompatibleDC(&dc); V@.Ior}w  
 CBitmap*pOld=tdc.SelectObject(&bm); IkL#SgY  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); o)M}!MT  
 tdc.SelectObject(pOld); >jDDQ@  
 BITMAP btm; ozyX$tp  
 bm.GetBitmap(&btm); <`8n^m*  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; { T/[cu<  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); T= 80,  
 BITMAPINFOHEADER bih; \i>?q   
 bih.biBitCount=btm.bmBitsPixel; Fk&c=V;SU  
 bih.biClrImportant=0; x /(^7#u,  
 bih.biClrUsed=0; 2lZ Q)   
 bih.biCompression=0; u74[>^  
 bih.biHeight=btm.bmHeight; `z}?"BW|  
 bih.biPlanes=1; E<rp7~#  
 bih.biSize=sizeof(BITMAPINFOHEADER); ; }I:\P  
 bih.biSizeImage=size; |MTnH/|  
 bih.biWidth=btm.bmWidth; ^ox=HNV  
 bih.biXPelsPerMeter=0; @Z_x.Y6  
 bih.biYPelsPerMeter=0; 0Uz"^xO["  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); >.Pnkx*  
 static int filecount=0; L8@f-Kk  
 CString name; c`)\Pb/O  
 name.Format("pict%04d.bmp",filecount++); etQCzYIhn  
 name=m_Path+name; udK%>  
 BITMAPFILEHEADER bfh; X;+sUj8  
 bfh.bfReserved1=bfh.bfReserved2=0; %_H<:uGO%  
 bfh.bfType=((WORD)('M'<< 8)|'B'); a K[&V't~  
 bfh.bfSize=54+size; wA ,6bj  
 bfh.bfOffBits=54; *xAqnk   
 CFile bf; ~f2z]JLr:  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ w?PkO p  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Qab>|eSm  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); +uF>2b6'  
  bf.WriteHuge(lpData,size); # " 6Qj'/h  
  bf.Close(); djl*H  
  nCount++; #Qw0&kM7I  
 } .fqN|[>  
 GlobalFreePtr(lpData); c1(RuP:S  
 if(nCount==1) .|KyNBn  
  m_Number.Format("%d picture captured.",nCount); BiLY(1,  
 else kM l+yli3c  
  m_Number.Format("%d pictures captured.",nCount); |w~nVRb  
  UpdateData(FALSE); ZoW?nxY  
} G`D`Af/B  
vQG5*pR*w  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) @Rze| T.  
{ ;J( 8 L  
 if(pMsg -> message == WM_KEYDOWN) 6xmZXp d!  
 { 3lL-)<0A(  
  if(pMsg -> wParam == VK_ESCAPE) F}yW/  
   return TRUE; ^]Y> [[  
  if(pMsg -> wParam == VK_RETURN) _ gR;=~S  
   return TRUE; KJUH(]>F  
 } (*9$`!wS  
 return CDialog::PreTranslateMessage(pMsg); C\3rJy(VJ  
} FW;?s+Uyx  
'T;P;:!\  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {_"<1C  
{ HQ_Ok `  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ^rR1ZVY  
  SaveBmp(); v |,1[i{  
  return FALSE; _#E0g'3  
} :wyno#8`-  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Vi$~-6n&  
 CMenu pop; i$"F{|Z0  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); UBU=9a5  
 CMenu*pMenu=pop.GetSubMenu(0); tyDU @M  
 pMenu->SetDefaultItem(ID_EXITICON); h|9L5  
 CPoint pt; / y40(l?  
 GetCursorPos(&pt); \[i1JG  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this);  `,*3[  
 if(id==ID_EXITICON) [ZwjOi:)  
  DeleteIcon(); lN 4oW3QT  
 else if(id==ID_EXIT) fCn^=8KOZ  
  OnCancel(); r| wS<cA2  
 return FALSE; s-!ArB,  
} e(;,`L\*  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); z]y.W`i   
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~8Fk(E_  
 AddIcon(); =!A_^;NQf  
 return res; %g$o/A$  
} ^$jb7HMObI  
{%5eMyF#  
void CCaptureDlg::AddIcon() LKB$,pR~1l  
{ Y=?3 js?O  
 NOTIFYICONDATA data; ;u ({\K  
 data.cbSize=sizeof(NOTIFYICONDATA); Zd%k*BC  
 CString tip; =%K;X\NB  
 tip.LoadString(IDS_ICONTIP); zV37$Hb  
 data.hIcon=GetIcon(0); :gibfk]C  
 data.hWnd=GetSafeHwnd(); /)>3Nq4Zx  
 strcpy(data.szTip,tip); Y;M|D'y+  
 data.uCallbackMessage=IDM_SHELL; 1z4OI6$Af  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; BsDn5\ q  
 data.uID=98; [ -K&R  
 Shell_NotifyIcon(NIM_ADD,&data); ^ig' bw+WS  
 ShowWindow(SW_HIDE); h 0Q5-EA  
 bTray=TRUE; 9d659i C  
} ^98~U\ar  
!sP {gi#=  
void CCaptureDlg::DeleteIcon() wH&!W~M  
{ f|c{5$N!  
 NOTIFYICONDATA data; k@J&IJ  
 data.cbSize=sizeof(NOTIFYICONDATA); >z>!Luw  
 data.hWnd=GetSafeHwnd(); '3fu  
 data.uID=98; s?}e^/"v  
 Shell_NotifyIcon(NIM_DELETE,&data); :J@ gmY:C  
 ShowWindow(SW_SHOW); + .[ <%  
 SetForegroundWindow(); ,/I.t DH  
 ShowWindow(SW_SHOWNORMAL); prF%.(G2)  
 bTray=FALSE; =z69e%.  
} ` p-cSxR_  
%)W2H^  
void CCaptureDlg::OnChange() &)ChQZA  
{ U(g:zae  
 RegisterHotkey(); L|xbR#v  
} 0RLg:SV  
{rw|#Z>A  
BOOL CCaptureDlg::RegisterHotkey() &%DY\*  
{ ;bib/  
 UpdateData(); 8qTys8  
 UCHAR mask=0; dn+KH+v  
 UCHAR key=0; s};{ZAtE  
 if(m_bControl) E6ElNgL  
  mask|=4; cp7=epho  
 if(m_bAlt) t\,PB{P:J  
  mask|=2; m}t`FsB.  
 if(m_bShift) WX?IYQ+  
  mask|=1; k$R-#f;  
  key=Key_Table[m_Key.GetCurSel()]; sIGMA$EK  
 if(bRegistered){ S`0(*A[W*  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Jhhb7uU+  
  bRegistered=FALSE; 7,o7Cf2z  
 } `?_Q5lp/s  
 cMask=mask; $|@@Qk/T  
 cKey=key; g |yvF-+  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); xF'EiX~  
 return bRegistered; 06Sceq  
} v%z=ysA  
NP3y+s  
  四、小结 [D4SW#  
"$^ ~!1~  
  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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