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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: ,`+Bs&S 8  
  }R\B.2#M_@  
  一、实现方法 4(;20(q]  
CCy .  
  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>!|3ElT  
!Am =v=>  
#pragma data_seg("shareddata") nT)~w s  
HHOOK hHook =NULL; //钩子句柄 BHIM'24bp  
UINT nHookCount =0; //挂接的程序数目 ELD +:b  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 fA;x{0CAMX  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 m9uUDq#GJ  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey tPA"lBS !  
static int KeyCount =0; oX2r?.j#M  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 )y5iH){ !  
#pragma data_seg() FmR\`yY_,  
lej^gxj/2  
  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。 ]KzJ u`O%G  
Mru~<:9  
  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: EyzY2>"^  
}&=uZ:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR T<_+3kw  
cKey,UCHAR cMask) &KLvr|  
{ W0+u)gDDz  
 BOOL bAdded=FALSE; +I?Qg  
 for(int index=0;index<MAX_KEY;index++){ E:%>0FE  
  if(hCallWnd[index]==0){ t<8z08  
   hCallWnd[index]=hWnd; *pY/5? g  
   HotKey[index]=cKey; La@\q[U{@  
   HotKeyMask[index]=cMask; eO~eu]r  
   bAdded=TRUE; D_zcOq9  
   KeyCount++; \gjl^# ;  
   break; Y{`3`Pg&N  
  } qNhH%tYQ  
 } D~XU `;~u  
 return bAdded; 7Z9.z 4\  
} "hJ7 Vv_  
//删除热键 {P,>Q4N  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) aS2a_!f  
{ V#+126  
 BOOL bRemoved=FALSE; _3*: y/M_  
 for(int index=0;index<MAX_KEY;index++){ e_tZja2s  
  if(hCallWnd[index]==hWnd){ iz,]%<_PE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ l A 0-?k  
    hCallWnd[index]=NULL; ^V_ku@DY  
    HotKey[index]=0; |)~Ex 9%ev  
    HotKeyMask[index]=0; wbn^R'  
    bRemoved=TRUE; 7cy+Nz  
    KeyCount--; Fa6H(L3  
    break; j'#)~>b  
   } ^f!Zr  
  } Xq[:GUnt  
 } xq8}6Q  
 return bRemoved; X^u4%O['  
} 3}v0{c  
nYo&x'  
CD*f4I#d  
  DLL中的钩子函数如下: f6@^ Mg  
]:[)KZ~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ))8Emk^Q{  
{ )zo#1$C-  
 BOOL bProcessed=FALSE; = E##},N"  
 if(HC_ACTION==nCode) L.R"~3  
 { IS3e|o*]MP  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 U]+b` m  
   switch(wParam) -Y5YCY!`  
   {  d<e+__ 2  
    case VK_MENU: u Zo]8mV  
     MaskBits&=~ALTBIT; U&tfl/  
     break; yd\5Z[iEp  
    case VK_CONTROL: Krt$=:m|1  
     MaskBits&=~CTRLBIT; f>.` xC{  
     break; ^\xCqVk_R  
    case VK_SHIFT: &\CJg'D:m  
     MaskBits&=~SHIFTBIT; 6:e}v'q{  
     break; z_5rAlnwT.  
    default: //judge the key and send message WV5r$   
     break; |_xZ/DT  
   } ahK?]:&QO  
   for(int index=0;index<MAX_KEY;index++){ ,+swH;=7#r  
    if(hCallWnd[index]==NULL) |?4~T:  
     continue; ~xsb5M5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8#NIs@DJ  
    { 5 ]A$P\7~1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); P]~N-xdV  
     bProcessed=TRUE;  m^W*[ ^p  
    } ~N)( ^ 4  
   } (MF+/fi  
  } KqT#zj  
  else if((lParam&0xc000ffff)==1){ //有键按下 W)G2Cs?p  
   switch(wParam) }Rf}NWU)|  
   { ,I 9][_  
    case VK_MENU: Qivf|H619  
     MaskBits|=ALTBIT; G.A=hGw  
     break; SaX,^_GY  
    case VK_CONTROL: lq78gOg{  
     MaskBits|=CTRLBIT; 'Qp&,xK  
     break; \}]=?}(  
    case VK_SHIFT: 9&|12x$  
     MaskBits|=SHIFTBIT; wdN>KS2!  
     break; :pL1F)-*  
    default: //judge the key and send message r_qncy,F  
     break; ^=4I|+P,6.  
   } {ziYd;Ys1  
   for(int index=0;index<MAX_KEY;index++){ =rf )yp-D  
    if(hCallWnd[index]==NULL) (Von;U  
     continue; W>aQ tT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :8\*)"^E  
    { '7RR2f>V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -+j9X;h:  
     bProcessed=TRUE; KNO*)\   
    } op.PS{_t  
   } s K""  
  } 'PmHBQvt&  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 i{1)=_$Vt`  
   for(int index=0;index<MAX_KEY;index++){ 8.q13t !D  
    if(hCallWnd[index]==NULL) [N0/">c  
     continue; k8Su/U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) JO<gN= [  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); mM\!4Yi`7  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 u`L!za7fi  
   } V{ a}#J  
  } !.tL"U~4  
 } &"~,V6,q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); .&* ({UM  
} =DmPPl{  
vkNZ -`+I  
  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: IxK 3,@d  
ZYl-p]\*y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  Xv? S  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $w";*">:0  
1%]{0P0?[  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: kp#c:ym  
W[jW;uk  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +Zty}fe  
{ kG|>_5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) )|59FOWg  
 { 5W:Gl?$S}  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 sTYuwna~   
  SaveBmp(); b}EYNCw_7S  
  return FALSE; (|ct`KU0#  
 } lyOrM7Gs  
 …… //其它处理及默认处理 y<'2BTf  
} bSeL"   
$Nt]${0  
{$u@6& B  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 gs`27Gih  
FzsS~C$wH{  
  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。 K_<lO,[S  
Bcd0   
  二、编程步骤 Hm8EYPr J  
Gr"2G,,VI  
  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"; wFoR,oXtL/  
U# FJ8CD&u  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ShsP]$Yp  
fO^EMy\  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; .eDxIWW+ft  
rt\<nwc  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; l+3%%TV@L  
&a2V-|G',  
  5、 添加代码,编译运行程序。 T^=Ee?e  
%;"B;~  
三、程序代码 UmP?}Xw6  
_6QLnr&@j  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL J4K|KS7   
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) =Y=^]ayO/  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ [<3Q$*Ew  
#if _MSC_VER > 1000 [u9S+:7"  
#pragma once B#Oc8`1Y  
#endif // _MSC_VER > 1000 d@q t%r3;  
#ifndef __AFXWIN_H__ ui#1+p3G  
#error include 'stdafx.h' before including this file for PCH 5>z:[OdY*  
#endif lG[ )8!:+  
#include "resource.h" // main symbols sP8-gkkor  
class CHookApp : public CWinApp "#eNFCo7k  
{ XM5;AcD  
 public: H?/cG_^y0  
  CHookApp(); 7]HIE]#  
  // Overrides Ph7(JV{  
  // ClassWizard generated virtual function overrides U%B]N@  
  //{{AFX_VIRTUAL(CHookApp) C}DG'z9  
 public: RGPU~L  
  virtual BOOL InitInstance(); e&a[k  
  virtual int ExitInstance(); >aanLLO  
  //}}AFX_VIRTUAL W<Vzd4hR  
  //{{AFX_MSG(CHookApp) )1tnZ=&  
  // NOTE - the ClassWizard will add and remove member functions here. 3K'o&>}L  
  // DO NOT EDIT what you see in these blocks of generated code ! me}Gb a  
  //}}AFX_MSG C{I8Pio{b  
  DECLARE_MESSAGE_MAP() ,*}g r  
}; ; HLMU36q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); <J_,9&\J  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 77=y!SDP  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C6=;(=?C  
BOOL InitHotkey(); 'm p{O  
BOOL UnInit(); .5Z@5g`  
#endif 3vGaT4TDx  
z&HN>7  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Zn*CJNB  
#include "stdafx.h" ,aj+mlZd2  
#include "hook.h" %>z8:oJ  
#include <windowsx.h> m LxwJ  
#ifdef _DEBUG r@@eC['  
#define new DEBUG_NEW Drq{)#7  
#undef THIS_FILE S bqM=I+  
static char THIS_FILE[] = __FILE__; kk\zZC <  
#endif 9Nbg@5(  
#define MAX_KEY 100 TAXkfj  
#define CTRLBIT 0x04 |9i/)LRXe  
#define ALTBIT 0x02 Z_4H2HseL  
#define SHIFTBIT 0x01 LXEu^F~{u#  
#pragma data_seg("shareddata") 0 c'2rx  
HHOOK hHook =NULL; s? \9i6  
UINT nHookCount =0; fOjt` ~ToI  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey d\<aJOi+-  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT #/sE{jm  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 17[t_T&Ak9  
static int KeyCount =0; [Jh))DIx  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift >fzzrD}]  
#pragma data_seg() kFZu/HRI  
HINSTANCE hins; >zx50e)  
void VerifyWindow(); u.K'"-xt4K  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 'FA)LuAok  
//{{AFX_MSG_MAP(CHookApp) U@t?jTMBkO  
// NOTE - the ClassWizard will add and remove mapping macros here. NVh>Q>B$_  
// DO NOT EDIT what you see in these blocks of generated code! d~f0]O  
//}}AFX_MSG_MAP i^V4N4ux]  
END_MESSAGE_MAP() LGg x.Z  
Q_|S^hx Q  
CHookApp::CHookApp() uM!r|X)8  
{ Va[dZeoy  
 // TODO: add construction code here, <Phr`/  
 // Place all significant initialization in InitInstance {^O/MMB\\%  
} SVEA  
lG^nT  
CHookApp theApp; wNZS6JF.d  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) S$_Ts1Ge6  
{ -clg 'Aa;.  
 BOOL bProcessed=FALSE; D2*Q1n  
 if(HC_ACTION==nCode) yD id` ym  
 { X1PlW8pd  
  if((lParam&0xc0000000)==0xc0000000){// Key up p){RS q  
   switch(wParam) K.L+; nQ  
   { ?j$8Uy$$  
    case VK_MENU: ump:dL5{  
     MaskBits&=~ALTBIT; ?;7>`F6ld  
     break; f7AJSHe  
    case VK_CONTROL:  ~9jP++&  
     MaskBits&=~CTRLBIT; &IPK5o,  
     break; 73Zs/  
    case VK_SHIFT: Nm :lC%>X  
     MaskBits&=~SHIFTBIT; 2o3k=hKS  
     break; GQAg ex)D  
    default: //judge the key and send message ^|12~d_.T  
     break; Y%cA2V\#m  
   } 7Z:l;%]K  
   for(int index=0;index<MAX_KEY;index++){ P*=3$-`  
    if(hCallWnd[index]==NULL) l8Iy 03H  
     continue; 7(iRz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hQLx"R$  
    { E0%Y%PQ**{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); jl%e O.  
     bProcessed=TRUE; ?BZ`mrH^  
    } X1QZEl  
   } k#G7`dJl  
  } (dnc7KrM  
  else if((lParam&0xc000ffff)==1){ //Key down QL!+.y%  
   switch(wParam) ;xC~{O  
   { HQj4h]O#  
    case VK_MENU: JWjp<{Q; 1  
     MaskBits|=ALTBIT; +uXnFf d^  
     break; "JGig!9  
    case VK_CONTROL: ^7<mlr  
     MaskBits|=CTRLBIT; !/9Sb1_~  
     break; !{aA*E{  
    case VK_SHIFT: 3$f5][+U  
     MaskBits|=SHIFTBIT; /'^>-!8_1  
     break; T:5%sN;#O  
    default: //judge the key and send message siZ_JJW  
     break; L. ?dI82c  
   } gx R|S  
   for(int index=0;index<MAX_KEY;index++) W 9MZ  
   { m&c(N  
    if(hCallWnd[index]==NULL) Olh-(u:9+O  
     continue; mK&9p{4#U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6HQwL\r79  
    { i_^NbC   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); I`>%2mP[C  
     bProcessed=TRUE; D??/=`|8  
    } dp W%LXM_  
   } UC$+&&rO  
  } q)y8Bv|  
  if(!bProcessed){ mV]g5>Q\  
   for(int index=0;index<MAX_KEY;index++){ n 9M6wS  
    if(hCallWnd[index]==NULL) \`5u@Nzx  
     continue; ,B>b9,~3a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) euC,]n.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $ !=:ES  
   } [<$d@}O  
  } 8uW:_t]q  
 } PX/0  jv  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?2>v5p  
} .Sw'Bo!Ee  
=xP{f<`   
BOOL InitHotkey() .Q@'Ob`  
{ zhL,BTH  
 if(hHook!=NULL){ ?E@[~qq_  
  nHookCount++; "$YLU}S9  
  return TRUE; =i %w_ e  
 } RL8 wSK  
 else ZJM^P'r.1c  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Bq`kVfx  
  if(hHook!=NULL) <cjTn:w  
   nHookCount++; aBLb i  
  return (hHook!=NULL); L#b Q`t  
} ay[*b_f  
BOOL UnInit() GQWTQIl]  
{ "A3xX&9-q  
 if(nHookCount>1){ l_EI7mJ  
  nHookCount--; A2S9h,t  
  return TRUE; S*:w\nXP~  
 } vH8%a8V  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ]iX$p~riH  
 if(unhooked==TRUE){ Rj= Om  
  nHookCount=0; DlO;EH  
  hHook=NULL; j)*nE./3  
 } 5nb6k,+E  
 return unhooked; 6[7k}9`alz  
} IQv>{h}  
F'*4:WD7  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) - mXr6R?  
{ =1Jo-!{{  
 BOOL bAdded=FALSE; VHNiTp  
 for(int index=0;index<MAX_KEY;index++){ }Cf[nGh|B  
  if(hCallWnd[index]==0){ M lwQ_5O  
   hCallWnd[index]=hWnd; !-~(*tn  
   HotKey[index]=cKey; [GM<Wt0  
   HotKeyMask[index]=cMask; ^q2zqC  
   bAdded=TRUE; ywte \}  
   KeyCount++; ZeV)/g,w  
   break; BT0hx!Ti  
  } Gjr2]t;E  
 } 2 wvDC@  
 return bAdded; eQj/)@B:V  
} F tjm@:X  
j]SkBZgik  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?yK\L-ad  
{ ]aL}&GlHt  
 BOOL bRemoved=FALSE; $vz%   
 for(int index=0;index<MAX_KEY;index++){ ^Yz05\  
  if(hCallWnd[index]==hWnd){ Z Z7U^#RT  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ d5hE!=  
    hCallWnd[index]=NULL; s ~G{-)*  
    HotKey[index]=0; OK(d&   
    HotKeyMask[index]=0; 4y.[tk5  
    bRemoved=TRUE; "<#:\6aym  
    KeyCount--; Df^S77&c!  
    break; P#PQ4uK \  
   } ?Pc 3*.  
  } p7er04/}\  
 } BZ9iy~  
 return bRemoved; "dTXT  
} fO nvC*  
w.H+$=aK  
void VerifyWindow() ?C3cPt"  
{ <^{:K`  
 for(int i=0;i<MAX_KEY;i++){ ,pz CJ@5  
  if(hCallWnd!=NULL){ Hc9pWr "N  
   if(!IsWindow(hCallWnd)){ EVsZ:Ra^k  
    hCallWnd=NULL; t;3.;  
    HotKey=0; jfamuu7  
    HotKeyMask=0; B?Skw{&  
    KeyCount--; (%}C  
   } Y2EN!{YU  
  } !)34tu2  
 } ZbUf|#GTB  
} p6'8l~W+  
qZe"'"3M  
BOOL CHookApp::InitInstance() HxaUVg0  
{ oDa{HP\O]W  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); flqTx)xE  
 hins=AfxGetInstanceHandle(); 5@ug1F&   
 InitHotkey(); wn&2-m*a  
 return CWinApp::InitInstance(); mZyTo/\0  
} }__+[-  
A$cbH.  
int CHookApp::ExitInstance() h;->i]  
{ -yeT$P&|  
 VerifyWindow(); ZI7<E  
 UnInit(); )RFeF!("  
 return CWinApp::ExitInstance(); Sqs`E[G*  
} x#D=?/~/Kv  
3 6 ;hg #  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file /&yT2p  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 'S" F=)*-  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ intf%T5#  
#if _MSC_VER > 1000 P>|2~YxjU  
#pragma once Q1z04m1_y[  
#endif // _MSC_VER > 1000 yhaYlYv[_3  
c+=&5=i[3  
class CCaptureDlg : public CDialog WmA578|l!  
{ <X?F :?Mk  
 // Construction }JD(e}8$!  
 public: Npqbxb  
  BOOL bTray; %:*HzYf  
  BOOL bRegistered; 32yNEP{  
  BOOL RegisterHotkey(); eORt qX8*  
  UCHAR cKey; _q 8m$4  
  UCHAR cMask; @^O ww(I  
  void DeleteIcon(); -bwl~3ZTi  
  void AddIcon(); OjZ@_V:  
  UINT nCount; PW}.`  
  void SaveBmp(); Cp%|Q.?  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Ee O{G*pq  
  // Dialog Data mX89^  
  //{{AFX_DATA(CCaptureDlg) #82B`y<<y/  
  enum { IDD = IDD_CAPTURE_DIALOG }; hlRE\YO&8R  
  CComboBox m_Key; Y{KJk'xN5W  
  BOOL m_bControl; -MjRFa  
  BOOL m_bAlt; Lmb<)YY  
  BOOL m_bShift; \IKr+wlN8  
  CString m_Path; ]NCOi ?Odx  
  CString m_Number; F~1R.r_Lu  
  //}}AFX_DATA scdT/|(U$  
  // ClassWizard generated virtual function overrides E _K7.c4M  
  //{{AFX_VIRTUAL(CCaptureDlg) gA6C(##0  
 public: 5 S 1m&s5k  
  virtual BOOL PreTranslateMessage(MSG* pMsg); }1V&(#H2  
 protected: |($pXVLH`  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support tz,FK;8  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ?D_zAh?pW  
  //}}AFX_VIRTUAL DjIs"5Iei  
  // Implementation rfjQx]3pB  
 protected: Gkl#s7'  
  HICON m_hIcon; Ot?rsr  
  // Generated message map functions fOVRtSls  
  //{{AFX_MSG(CCaptureDlg) z?PF9QL1  
  virtual BOOL OnInitDialog(); B !XT:.+  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); }49?Z3  
  afx_msg void OnPaint(); uyj5}F+O  
  afx_msg HCURSOR OnQueryDragIcon(); ;c`B '  
  virtual void OnCancel(); ?U |lZ~o  
  afx_msg void OnAbout(); +~-|( y  
  afx_msg void OnBrowse(); DcOLK\  
  afx_msg void OnChange(); hXCDlCO  
 //}}AFX_MSG D)Zv  
 DECLARE_MESSAGE_MAP() DCj!m<Y&  
}; !>Xx</iD1  
#endif L|<Mtw  
CVm*Q[5s"  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $Ix^Rm9c  
#include "stdafx.h" }^H_|;e1p  
#include "Capture.h" *b&|  
#include "CaptureDlg.h" 7% h Mf$KQ  
#include <windowsx.h> FB@G.f  
#pragma comment(lib,"hook.lib") yZ`\.GgC^&  
#ifdef _DEBUG (~jOtUyT  
#define new DEBUG_NEW WI%,m~  
#undef THIS_FILE `)'YU^s  
static char THIS_FILE[] = __FILE__; L,i-T:Z~=  
#endif }sFHb[I &  
#define IDM_SHELL WM_USER+1 IoC,\$s,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [K5afnq`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >a<;)K^1  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; \?j(U8mB>  
class CAboutDlg : public CDialog *d=pK*g  
{ @c.pOX[]m,  
 public: %lBFj/B  
  CAboutDlg(); }{$@|6)R   
  // Dialog Data HkrNt/]  
  //{{AFX_DATA(CAboutDlg) ,D8 Tca\v  
  enum { IDD = IDD_ABOUTBOX }; BEw(SQH  
  //}}AFX_DATA ?IK[]=!  
  // ClassWizard generated virtual function overrides ||hd(_W8  
  //{{AFX_VIRTUAL(CAboutDlg) aePk^?KbB  
 protected: *`kh}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !>M: G:K  
  //}}AFX_VIRTUAL d/MMPge3  
  // Implementation ){v nmJJ%  
 protected: -{dw Ll_  
  //{{AFX_MSG(CAboutDlg) 7*sB"_U2  
  //}}AFX_MSG .m .v$(  
  DECLARE_MESSAGE_MAP() ' `S,d[~  
}; ^Oo%`(D?  
, vWcWT  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ujaaO6oZ7  
{ o!Y7y1$  
 //{{AFX_DATA_INIT(CAboutDlg) MD+Q_  
 //}}AFX_DATA_INIT +7=3[K  
} B9]KC i  
i9d.Ls  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #soWX_>  
{ #(OL!B  
 CDialog::DoDataExchange(pDX); bS*9eX=K  
 //{{AFX_DATA_MAP(CAboutDlg) 8"+Kz  
 //}}AFX_DATA_MAP L!\I>a5C0G  
} cG.4%Va@s_  
sPut@4[S  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) z;T?2~g!  
 //{{AFX_MSG_MAP(CAboutDlg) Gd!y,n&s  
 // No message handlers @>:r'Fmu-  
 //}}AFX_MSG_MAP O %OeYO69  
END_MESSAGE_MAP() "bJWyUb  
./u3z|q1  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/)  0y?bwxkc  
: CDialog(CCaptureDlg::IDD, pParent) 9Z} -%Z[,)  
{ D ,nF0p  
 //{{AFX_DATA_INIT(CCaptureDlg) LVX.stN#p  
  m_bControl = FALSE; C&\#{m_1B  
  m_bAlt = FALSE; d;K,2  
  m_bShift = FALSE;  W+e  
  m_Path = _T("c:\\"); ikUG`F%W  
  m_Number = _T("0 picture captured."); 8< R#}  
  nCount=0; W_%Dg]l   
  bRegistered=FALSE; 6:H@= fEv  
  bTray=FALSE; %5'6^bT  
 //}}AFX_DATA_INIT tks1*I$S<  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 `rvS(p[s  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); h DCR>G  
} @I9A"4Im  
->d 3FR  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) svN& ~@ l  
{ y6f YNB  
 CDialog::DoDataExchange(pDX); @PutUYz  
 //{{AFX_DATA_MAP(CCaptureDlg) <d8 Yk>R  
  DDX_Control(pDX, IDC_KEY, m_Key); :M3Fq@w=  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); *&XOzaVU  
  DDX_Check(pDX, IDC_ALT, m_bAlt); g/eE^o ~;  
  DDX_Check(pDX, IDC_SHIFT, m_bShift);  Hi#hf"V  
  DDX_Text(pDX, IDC_PATH, m_Path); R,8;GS42  
  DDX_Text(pDX, IDC_NUMBER, m_Number); +Y-Gp4"  
 //}}AFX_DATA_MAP r3'0{Nn+  
} 8 K'3iw>z  
G@s rQum(  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) `#R[x7bA1  
//{{AFX_MSG_MAP(CCaptureDlg) W2'u]1bs  
 ON_WM_SYSCOMMAND() &=~Jw5WK  
 ON_WM_PAINT() U<K)'l6#2n  
 ON_WM_QUERYDRAGICON() C h>r.OfP  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) )m|)cLT&  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) f]Xh7m(Gh  
 ON_BN_CLICKED(ID_CHANGE, OnChange) UZz/v#y~  
//}}AFX_MSG_MAP `f S$@{YI_  
END_MESSAGE_MAP() nH_M#  
qf;x~1efC4  
BOOL CCaptureDlg::OnInitDialog() 2)-Umq{]{  
{ |cs]98FEf  
 CDialog::OnInitDialog(); 9!; /+P  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); @P@?KZ..v!  
 ASSERT(IDM_ABOUTBOX < 0xF000); PKJw%.-  
 CMenu* pSysMenu = GetSystemMenu(FALSE); dSkMA  
 if (pSysMenu != NULL) }"Clv /3_  
 { Qu|H_<8g  
  CString strAboutMenu; ;0FfP  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ,N93H3(  
  if (!strAboutMenu.IsEmpty()) $i1$nc8  
  { wNtC5  
   pSysMenu->AppendMenu(MF_SEPARATOR); :<hM@>eFn  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #A\@)wJ  
  } {\hjKP  
 } f3^Anaa]l  
 SetIcon(m_hIcon, TRUE); // Set big icon *PM#ngLX}r  
 SetIcon(m_hIcon, FALSE); // Set small icon }]<0!q &xB  
 m_Key.SetCurSel(0); DHQS7%)f`  
 RegisterHotkey(); xa8;"Y~"bg  
 CMenu* pMenu=GetSystemMenu(FALSE); VYbH:4K@%  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ^,}1^?*  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); zcGmru|k  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); TophV}@B`  
 return TRUE; // return TRUE unless you set the focus to a control >cJix 1  
} 0fu*}v"  
8 kvF~d ;  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) z9Z4MXl  
{ \(_(pcl  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) /*P) C'_M  
 { $O3.ex V  
  CAboutDlg dlgAbout; gWQ(B  
  dlgAbout.DoModal(); Q<0X80w>  
 } > 9.%hSy  
 else [n4nnmM  
 { Wz%H?m:g#  
  CDialog::OnSysCommand(nID, lParam); galzk$D  
 } LY-,cXm&|  
} zG{P5@:.R  
z^vfha  
void CCaptureDlg::OnPaint() qA0PGo  
{ # ~Doz7~  
 if (IsIconic()) GXG 7P,p,  
 { 9fm9xTL  
  CPaintDC dc(this); // device context for painting >v2/0>U  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); D%L^[|)c\s  
  // Center icon in client rectangle oz:"w nX  
  int cxIcon = GetSystemMetrics(SM_CXICON); #/_{(P  
  int cyIcon = GetSystemMetrics(SM_CYICON); (\ge7sE-oo  
  CRect rect; t0,=U8]w  
  GetClientRect(&rect); AXF 1{  
  int x = (rect.Width() - cxIcon + 1) / 2; /%g+|C  
  int y = (rect.Height() - cyIcon + 1) / 2; bmu]zJ  
  // Draw the icon _o[fjd  
  dc.DrawIcon(x, y, m_hIcon); pT{is.RM  
 } :{+~i.*  
 else rGQ2 ve  
 { Bv<aB(c  
  CDialog::OnPaint(); [Do^EJ  
 } .' }jd#  
} O uNPDq%  
Sl/]1[|mb  
HCURSOR CCaptureDlg::OnQueryDragIcon() ;4l8Qg 7  
{ Idb*,l|<  
 return (HCURSOR) m_hIcon; @R%* ;)*F  
} tn#cVB3  
fLnwA|n=  
void CCaptureDlg::OnCancel() O}>@G  
{ l^Ob60)2  
 if(bTray) 793 15A  
  DeleteIcon(); >TMd1? ,  
  CDialog::OnCancel(); )$RV)  
} d?&`Z Vl  
.W^B(y(tA  
void CCaptureDlg::OnAbout() /78]u^SW  
{ ((C|&$@M  
 CAboutDlg dlg; M!+J[q  
 dlg.DoModal(); E*O($tS  
} 6@TU9AZS `  
A|GtF3:G  
void CCaptureDlg::OnBrowse() ]!ox2m_U  
{ e8rZP(g&g  
 CString str; cI P.5)Ca  
 BROWSEINFO bi; /v^ '5j1o  
 char name[MAX_PATH]; h;,1BpbM  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); f-3CDUQ`  
 bi.hwndOwner=GetSafeHwnd(); fGb}V'x}r  
 bi.pszDisplayName=name; md*U  
 bi.lpszTitle="Select folder"; ,VS(4  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; )7 q"l3e"u  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Lo3N)~5  
 if(idl==NULL) :`e#I/,  
  return;  V1B!5N<  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 5mQ@&E~#W  
 str.ReleaseBuffer(); mFg$;F  
 m_Path=str; U|]cB  
 if(str.GetAt(str.GetLength()-1)!='\\') S=ZZ[E_~S  
  m_Path+="\\"; 9v_s_QkL2  
 UpdateData(FALSE); ||JUP}eP  
} 4XNheP;b  
VE-l6@`  
void CCaptureDlg::SaveBmp() Ly&+m+Gwu  
{ ;+<IWDo  
 CDC dc; j1KNgAo<4  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); =B9-}]DDO  
 CBitmap bm; 5]>*0#C S  
 int Width=GetSystemMetrics(SM_CXSCREEN); a;t}'GQGk  
 int Height=GetSystemMetrics(SM_CYSCREEN); ss[`*89  
 bm.CreateCompatibleBitmap(&dc,Width,Height); wn.~Dx  
 CDC tdc; n74\{`8]o  
 tdc.CreateCompatibleDC(&dc); y92R}e\M  
 CBitmap*pOld=tdc.SelectObject(&bm); +9w[/n^,G  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); .ojEKu+EJ'  
 tdc.SelectObject(pOld); gYhY1Mym  
 BITMAP btm; 9T;4aP>6j#  
 bm.GetBitmap(&btm); lhKn&U  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; /kY9z~l  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); db~^Gqv6k  
 BITMAPINFOHEADER bih; 5>I-? Ki  
 bih.biBitCount=btm.bmBitsPixel; JcWp14~e  
 bih.biClrImportant=0; 4d`YZNvZW/  
 bih.biClrUsed=0; qFD ZD)K  
 bih.biCompression=0; _;B wP  
 bih.biHeight=btm.bmHeight; 1(-!TJ{  
 bih.biPlanes=1; pASX-rb  
 bih.biSize=sizeof(BITMAPINFOHEADER); 9a=Ll]=\  
 bih.biSizeImage=size; !\X9$4po@  
 bih.biWidth=btm.bmWidth; x=t(#R m  
 bih.biXPelsPerMeter=0; 3Do0?~n  
 bih.biYPelsPerMeter=0; 8 MQq3  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ^FKiVKI:  
 static int filecount=0; S3\NB3@qC&  
 CString name; eCYPd-d  
 name.Format("pict%04d.bmp",filecount++); Fp/{L  
 name=m_Path+name; C3}:DIn"w  
 BITMAPFILEHEADER bfh; >G:Q/3jh  
 bfh.bfReserved1=bfh.bfReserved2=0; H].|K/-p  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 1Ng+mT  
 bfh.bfSize=54+size; >\d&LLAe  
 bfh.bfOffBits=54; oT-gZedW(  
 CFile bf; |Y>Jf~SN  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ u#,8bw?1  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); fZ$b8  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); T&lgWOls  
  bf.WriteHuge(lpData,size); TI'v /=;)  
  bf.Close(); 9B!Sv/)y!r  
  nCount++; mux/\TII  
 } uZC=]Ieh  
 GlobalFreePtr(lpData); UDHWl_%L  
 if(nCount==1) rP:g`?*V  
  m_Number.Format("%d picture captured.",nCount); e0TYHr)X>3  
 else } :0_%=)N<  
  m_Number.Format("%d pictures captured.",nCount); ob\-OMNs@  
  UpdateData(FALSE); K6kz{R%`  
} inWLIXC,  
,X.[37  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) z:>cQUYl  
{ 2aj1IBnz6/  
 if(pMsg -> message == WM_KEYDOWN) 8:$h&aBI  
 { t(u2%R4<d  
  if(pMsg -> wParam == VK_ESCAPE) =]%JTGdp(  
   return TRUE; vN Bg&m  
  if(pMsg -> wParam == VK_RETURN) |NuMDVd+s  
   return TRUE; ~[HzGm%  
 } CRK%^3g  
 return CDialog::PreTranslateMessage(pMsg); <rBW6o7  
} XOvJlaY)'.  
\rS*\g:i  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4j#y?^s  
{ ,U~A=bsa  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ h3o'T=`Sm  
  SaveBmp(); suY47DCX)  
  return FALSE; zMsup4cl  
}  T Rv  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ =SJ#6uFS  
 CMenu pop; QQrldc(I  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); "'U^8NA2  
 CMenu*pMenu=pop.GetSubMenu(0); 4>d4g\Z0L  
 pMenu->SetDefaultItem(ID_EXITICON); $G".PWc  
 CPoint pt; Q;]JVT1  
 GetCursorPos(&pt); KqK]R6>  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); +V4)><  
 if(id==ID_EXITICON) #*o0n>O  
  DeleteIcon(); rYb5#aT[  
 else if(id==ID_EXIT) ^%r6+ey  
  OnCancel(); #L*\^ c  
 return FALSE; \ %Mcvb.?  
} aJ'Fn  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); {<42PJtPY  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) =I# pXL  
 AddIcon(); W_W!v&@E=  
 return res; NiZfaC6V  
} Rl Oy,/-<  
2:38CdkYp  
void CCaptureDlg::AddIcon() '(.5!7?Qc  
{ h.edb6  
 NOTIFYICONDATA data; TTXF r  
 data.cbSize=sizeof(NOTIFYICONDATA); (!* l+}  
 CString tip; *ERV\/  
 tip.LoadString(IDS_ICONTIP); "t0^4=c+7  
 data.hIcon=GetIcon(0); zjmo IE  
 data.hWnd=GetSafeHwnd(); P~j#8cH7  
 strcpy(data.szTip,tip); Bgxk>Y  
 data.uCallbackMessage=IDM_SHELL; $e\s8$EO  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; riIubX#  
 data.uID=98; p*Z<DEh#  
 Shell_NotifyIcon(NIM_ADD,&data); 0>28o.  
 ShowWindow(SW_HIDE); ;/Hr ZhOE  
 bTray=TRUE; "*bLFORkq'  
} K(+=V)'Dz  
UD-+BUV  
void CCaptureDlg::DeleteIcon() |{#St-!-7  
{ Ok!P~2J  
 NOTIFYICONDATA data; L]=]/>jQ6  
 data.cbSize=sizeof(NOTIFYICONDATA); YK/? mj1x  
 data.hWnd=GetSafeHwnd(); Qc7*p]E&  
 data.uID=98; [+\He/M6  
 Shell_NotifyIcon(NIM_DELETE,&data); zDvV%+RW)  
 ShowWindow(SW_SHOW); $MR1 *_\V  
 SetForegroundWindow(); pr<u 5  
 ShowWindow(SW_SHOWNORMAL); Cj= R\@  
 bTray=FALSE; <f>77vh0  
} RdX+:!lD  
tK3$,9+  
void CCaptureDlg::OnChange() > "hP  
{ Ti? "Hr<W  
 RegisterHotkey(); m6i ,xn  
} Qsbyy>o)  
QNbZ)  
BOOL CCaptureDlg::RegisterHotkey() nE]rPRU}[  
{ YuhfPa  
 UpdateData(); n*\o. :f  
 UCHAR mask=0; Ae2N"%Ej  
 UCHAR key=0; .q 2r!B  
 if(m_bControl) Bl+\|[yd  
  mask|=4; uuM1_nD[  
 if(m_bAlt) sVh)Ofn  
  mask|=2; I#OZ:g^  
 if(m_bShift) %Xc,l Y1?  
  mask|=1; :W)lt28_  
  key=Key_Table[m_Key.GetCurSel()]; Zf$mwRS[_  
 if(bRegistered){ :Racu;xf  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 3eUi9_s+  
  bRegistered=FALSE; 02,t  
 } >#h,q|B  
 cMask=mask; Yi9Y`~J  
 cKey=key; fM.#FT??  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); XpANaqH\  
 return bRegistered; oXZWg~&l^  
} S<T 'B0r8  
?= 7k<a~  
  四、小结 }XUL\6U  
wqG#jC!5  
  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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