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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: @}}1xP4Sr  
  $(hZw  
  一、实现方法 @g?z>n n  
A#\X-8/  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: xk<0QYv   
Jx,s.Z0@7,  
#pragma data_seg("shareddata") v0p EN\  
HHOOK hHook =NULL; //钩子句柄 p[I gnO  
UINT nHookCount =0; //挂接的程序数目 e=C,`&s z  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ]vG)lY.=  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ON^u|*kO  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey g:V6B/M&  
static int KeyCount =0; ;0WlvKF  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 }zLE*b,  
#pragma data_seg() z}|'&O*.F  
d@~)Wlje  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 #-8/|_*  
zoXF"Nz  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 3?<vnpN=5d  
R``qQ;cc  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR wjs7K|PK  
cKey,UCHAR cMask) }\*|b@)]  
{ ={d\zjI$  
 BOOL bAdded=FALSE; .4-S|]/d,  
 for(int index=0;index<MAX_KEY;index++){ =Ih_[$1dw  
  if(hCallWnd[index]==0){ oWT0WS  
   hCallWnd[index]=hWnd; 8A qe'2IH=  
   HotKey[index]=cKey; ^Y!`wp2vn  
   HotKeyMask[index]=cMask; w-m2N-"= '  
   bAdded=TRUE; B.b)YE '  
   KeyCount++; 3x$#L!VuU  
   break; O5"80z38[  
  } VzNH%  
 } r,\(Y@I  
 return bAdded; hy rJu{p  
} pwQ."2x  
//删除热键 v?t+%|dzA  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) MsiSC  
{ n%hnL$!z  
 BOOL bRemoved=FALSE; vOU -bF%u  
 for(int index=0;index<MAX_KEY;index++){ ?z.`rD$}(n  
  if(hCallWnd[index]==hWnd){ l K%Hb=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ a$-ax[:\sm  
    hCallWnd[index]=NULL; 37DvI&  
    HotKey[index]=0; SJmri]4K  
    HotKeyMask[index]=0; 23m+"4t  
    bRemoved=TRUE; }r[BME  
    KeyCount--; [\y>Gv%  
    break; TW$^]u~v  
   } SX.v5plhc  
  } XPSWAp)  
 }  G%{jU'2  
 return bRemoved; fzcT(y  
} bzTM{<]sv  
G"(!5+DLy  
~5zhK:7c  
  DLL中的钩子函数如下: #k6T_ki  
SqLKF<tY]/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) [ CY=  
{ .FyC4"b=c  
 BOOL bProcessed=FALSE; U/;Vge8{  
 if(HC_ACTION==nCode) b(F`$N@7C  
 { 0!T $Ef   
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 :/08}!_:  
   switch(wParam) K,Vl.-4?  
   {  p_D)=Ef|&  
    case VK_MENU: 0&|-wduR=  
     MaskBits&=~ALTBIT; dcsd//E  
     break; 3FfS+q*3S  
    case VK_CONTROL: "=)`*"rr  
     MaskBits&=~CTRLBIT; >jm9x1+C  
     break; MH-,+-Eq  
    case VK_SHIFT: ! `o =2b=N  
     MaskBits&=~SHIFTBIT; n%}0hVu  
     break; 7>TG ]&  
    default: //judge the key and send message 8^~]Ym:  
     break; Yi3DoaS;"  
   } ^[6AOz+L  
   for(int index=0;index<MAX_KEY;index++){ )Lq FZ~B  
    if(hCallWnd[index]==NULL) 4?cg6WJ'6  
     continue; f sMF46  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wrWWXOZ 4  
    { !{+(oDN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); &^"m6  
     bProcessed=TRUE; u=5^xpI<D  
    } k 'o?/  
   } `Bx CTwc  
  } lnhZ!_  
  else if((lParam&0xc000ffff)==1){ //有键按下 \4 DH&gZ[  
   switch(wParam) ]`x~v4JU  
   { l?d*g&  
    case VK_MENU: E;SF f  
     MaskBits|=ALTBIT; ;C3](  
     break;  zcc]5>  
    case VK_CONTROL: [F e5a  
     MaskBits|=CTRLBIT; U3>G9g>^B  
     break; >dO^pDSs  
    case VK_SHIFT: {chl+au*l  
     MaskBits|=SHIFTBIT; g~]FI  
     break; (,k=mF  
    default: //judge the key and send message }5|uA/B  
     break; q>?oV(sF  
   } _nF_RpS  
   for(int index=0;index<MAX_KEY;index++){ JL1Whf  
    if(hCallWnd[index]==NULL) S; >_9  
     continue; IcN|e4t^J+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5,A/6b  
    { FRr<K^M  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +aMPwTF:3  
     bProcessed=TRUE; 3j6$!89'  
    } z;LntQZp-  
   } /h;X1Htx}  
  } ?6|EAKJ`lK  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 awUIYAgJ3  
   for(int index=0;index<MAX_KEY;index++){ ]Kd:ZmJ  
    if(hCallWnd[index]==NULL) /PO5z7n0J  
     continue; '{EDdlX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Q'Q^K  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {Q0"uE)-.  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 dPS}\&1  
   } %*,'&S  
  } eD(#zfP/+  
 } %NKf@If)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); d)LifsD)  
} Oo,<zS=ICk  
Pp?J5HW  
  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: ,JR7N_"I  
B<W{kEY  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Gg_i:4F  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); TB9ukLG^<<  
NVQ IRQ.  
  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: r__uPyIMG/  
=2< >dM#`  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 75a3H`  
{ &N,c:dNe  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ,+f'%)s_x  
 { ibh!8"[  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 E0w>c'kH  
  SaveBmp(); y5>H>NS  
  return FALSE; S%'t )tt,  
 } s i C/k*  
 …… //其它处理及默认处理 |[0|j/V%O  
} 0nC%tCV'  
cxVnlgq1  
SH"O<c Dp  
  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。 jZ)1]Q2  
{'JoVJKv  
  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。 d+l@hgz~  
&<4Jyhm:o  
  二、编程步骤 f"S^:F0  
[H!V  
  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"; 2x0[@cT i?  
wj5{f5 RWV  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; S?&ntUah  
%1S;y  
  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; (JOge~U  
1aKY+4/G  
  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; -(dc1?COi  
[W` _`  
  5、 添加代码,编译运行程序。 2\_}81 hM  
/K1YDq<=  
三、程序代码 v. !L:1@I.  
)jvYJ9s  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL *?cE]U6;  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) .:E%cL +h  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ cl[rgj  
#if _MSC_VER > 1000 zl$'W=[rFs  
#pragma once M,zUg_ @  
#endif // _MSC_VER > 1000 d(<[$ 3.  
#ifndef __AFXWIN_H__ .z+ [3Oj_E  
#error include 'stdafx.h' before including this file for PCH +eQg+@u  
#endif SD |5v*  
#include "resource.h" // main symbols *1|&uE&_R  
class CHookApp : public CWinApp a=Pl3Uo  
{ du  Pzt  
 public: U2seD5I  
  CHookApp(); xwq {0jY  
  // Overrides /g@!#Dt  
  // ClassWizard generated virtual function overrides i.Yz)Bw   
  //{{AFX_VIRTUAL(CHookApp) _3.=| @L  
 public: (U4]d`  
  virtual BOOL InitInstance(); ~m'PAC"Q$  
  virtual int ExitInstance(); >yiK&LW^?  
  //}}AFX_VIRTUAL ,5.ve)/dE  
  //{{AFX_MSG(CHookApp) `*^ f =y  
  // NOTE - the ClassWizard will add and remove member functions here. r$d,ChzQn?  
  // DO NOT EDIT what you see in these blocks of generated code ! zyTeF~_  
  //}}AFX_MSG Xi$2MyRd  
  DECLARE_MESSAGE_MAP() 0@k)C z[0;  
}; :@mb.' %*!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); *>I4X=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v,^2'C$o  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qf-0 | w  
BOOL InitHotkey(); rZEL7{  
BOOL UnInit(); /SO 4O|b  
#endif )ERmSWq/u  
B*W)e$  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. k "7l\;N  
#include "stdafx.h" RG4T9eZq  
#include "hook.h" Bu$Z+o  
#include <windowsx.h> S}WQ~e  
#ifdef _DEBUG {oOzXc6o  
#define new DEBUG_NEW hV_bm@f/y  
#undef THIS_FILE Fu].%`*xJ  
static char THIS_FILE[] = __FILE__; ):-\TVz~  
#endif 06X4mu{  
#define MAX_KEY 100 nB>C3e  
#define CTRLBIT 0x04 {B+|",O5)  
#define ALTBIT 0x02 2[zFKK  
#define SHIFTBIT 0x01 5 FKb7  
#pragma data_seg("shareddata") ,NB?_\$c  
HHOOK hHook =NULL; [M?'N w/[S  
UINT nHookCount =0; :@K 1pAh4  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey r2"B"%;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT UaG })  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey d.>Zn?u4L  
static int KeyCount =0; :%!` R72  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 6ZKSet8  
#pragma data_seg() 2"~|k_  
HINSTANCE hins; 4;_aFn  
void VerifyWindow(); vf^`'  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) xO3-I@  
//{{AFX_MSG_MAP(CHookApp) f_'#wc6  
// NOTE - the ClassWizard will add and remove mapping macros here. $^~dqmE2,  
// DO NOT EDIT what you see in these blocks of generated code! _!_%Afz  
//}}AFX_MSG_MAP apmZ&Ab  
END_MESSAGE_MAP() +9yV'd>U  
, !0-;H.Y  
CHookApp::CHookApp() {5`=){  
{ DNwqi"  
 // TODO: add construction code here, ?Pbh&!  
 // Place all significant initialization in InitInstance o>~xrV`E  
} m}`!FaB #  
nz+k ,  
CHookApp theApp; nymro[@O~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5=@q!8a*  
{ ~&{LMf  
 BOOL bProcessed=FALSE; pd%h5|*n;  
 if(HC_ACTION==nCode) 'fo.1  
 { ):<9j"Z;At  
  if((lParam&0xc0000000)==0xc0000000){// Key up 'TwvkU"  
   switch(wParam) \+,%RN.  
   { | 6/ # H*  
    case VK_MENU: ?azi(ja  
     MaskBits&=~ALTBIT; `!- w^~c  
     break; V\|V1c  
    case VK_CONTROL: $Jc>B#1  
     MaskBits&=~CTRLBIT; h=*eOxR"4^  
     break; $e#V^dph  
    case VK_SHIFT: zfGS=@e]G  
     MaskBits&=~SHIFTBIT; V)q|U6R  
     break; {PBm dX  
    default: //judge the key and send message D^dos`L0b  
     break; fC|NK+Xd`  
   } 9lU"m_ QT4  
   for(int index=0;index<MAX_KEY;index++){ V =9  
    if(hCallWnd[index]==NULL) jt5:rWB  
     continue; `PH]_]:%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sW#OA\i &  
    { (:h#H[F  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); mto=_|gn  
     bProcessed=TRUE; T>P[0`*)  
    } rP%B#%;S"  
   } SOg>0VH)  
  } 3OZu v};k  
  else if((lParam&0xc000ffff)==1){ //Key down /k_?S?  
   switch(wParam) md S`nhb  
   { r P1FM1"M  
    case VK_MENU: GI. =\s  
     MaskBits|=ALTBIT; B QxU~s  
     break; .=`r?#0  
    case VK_CONTROL: ))NiX^)8^  
     MaskBits|=CTRLBIT; SJ0IEPk  
     break; P,RdY M06  
    case VK_SHIFT: _+=M)lPm  
     MaskBits|=SHIFTBIT; V(#z{!  
     break; i!KZg74V  
    default: //judge the key and send message + $Yld{i  
     break; **KkPjAO?  
   } L;%_r)  
   for(int index=0;index<MAX_KEY;index++) 7%` \E9t  
   { wbImE;-Z  
    if(hCallWnd[index]==NULL) $v \@mW*R  
     continue; D}i_#-^MH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) P;' xa^Y  
    { %D_pTD\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); }eLnTi{  
     bProcessed=TRUE; Or:a\qQ1  
    } KB@F^&L {  
   } S!oG|%VuB#  
  } v{2euOFE  
  if(!bProcessed){ Kf>]M|G c  
   for(int index=0;index<MAX_KEY;index++){ +CaA%u  
    if(hCallWnd[index]==NULL) ;l$F<CzJay  
     continue; kZU v/]Y.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ud`!X#e~  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 99/`23YL  
   } 9*&RvsrX  
  } ]/cVlpZ{f  
 } N3U.62  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); n 97pxD_74  
} WAzn`xGxR"  
0D.qc8/V4.  
BOOL InitHotkey() l!7O2Ai5  
{ 77?D ~N[  
 if(hHook!=NULL){ 7#pu(:T$  
  nHookCount++; aMq|xHZ  
  return TRUE; ]IQ`.:g=9  
 } vj#Y /B  
 else ]f}#&]<(T  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); iD"9,1@~n  
  if(hHook!=NULL) o?]N2e&(  
   nHookCount++; wR@"]WkR=  
  return (hHook!=NULL); tgpg  
} %HWebZ-yY  
BOOL UnInit() 4Rv.m* ^B  
{ uW{;@ 7N  
 if(nHookCount>1){ mSFh*FG  
  nHookCount--; @o/126(k  
  return TRUE; L0QF(:F5  
 } _X/`7!f  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 7FB aN7l  
 if(unhooked==TRUE){ rAwuWM@BIg  
  nHookCount=0; :GBM`f@  
  hHook=NULL; hT DFIYV  
 } fBw"<J{  
 return unhooked; Tj3xK%K_r3  
} <RaUs2Q3.  
6aMG!_jC  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {1VMwANj  
{ 'jr[ ?WQ  
 BOOL bAdded=FALSE; -RK R. ,  
 for(int index=0;index<MAX_KEY;index++){ pf@H;QS`  
  if(hCallWnd[index]==0){ =bgu2#%Z  
   hCallWnd[index]=hWnd; FbU98n+z  
   HotKey[index]=cKey; %xuJQuCqf  
   HotKeyMask[index]=cMask; knb 9s`wR  
   bAdded=TRUE; fC<pCdsg  
   KeyCount++; Jb1L[sT2  
   break; h,!`2_&UQ  
  } Hsl0|jy(/  
 } Rv=rO|&]  
 return bAdded; 7,BULs\g  
} L!l`2[F|  
lk/[xQ/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) B3 NDx+%m  
{ vlSSw+r9  
 BOOL bRemoved=FALSE; BSd\Sg4  
 for(int index=0;index<MAX_KEY;index++){ MUjfqxTT  
  if(hCallWnd[index]==hWnd){ )&pcRFl  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^(c.A YI  
    hCallWnd[index]=NULL; 8H7=vk+  
    HotKey[index]=0; % Ix   
    HotKeyMask[index]=0; 8Ts_;uId  
    bRemoved=TRUE; g*-%.fNA  
    KeyCount--; u,&[I^WK`C  
    break; |J+oz7l?-  
   } 2zN"*Wkn  
  } ekV|a1)  
 } X1Vj"4'wT  
 return bRemoved; tOT(!yz  
} q:a-tdv2  
d(!g9H  
void VerifyWindow() P7D__hoE  
{ c80!Ub@  
 for(int i=0;i<MAX_KEY;i++){ ,B8u?{O  
  if(hCallWnd!=NULL){ s+ a} _a:  
   if(!IsWindow(hCallWnd)){ }Y`D^z~  
    hCallWnd=NULL; ?j^:jV  
    HotKey=0; }T1.~E  
    HotKeyMask=0; FA7q pc  
    KeyCount--; U ,7O{YM  
   } 4Uzx2   
  } 2, R5mL$  
 } UVz}"TRq.  
} 1n-+IR"  
FofeQ  
BOOL CHookApp::InitInstance() H:5- S  
{ d,+a}eTP'  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); e4mAKB s!  
 hins=AfxGetInstanceHandle(); /OtLIM+7~{  
 InitHotkey(); ~M Mv+d88  
 return CWinApp::InitInstance(); AR?1_]"=  
} L<H zPg  
'fS&WVR?  
int CHookApp::ExitInstance() i8Xz'Sw07  
{ FhJtiw@  
 VerifyWindow(); bg/a5$t  
 UnInit(); -)E nr6  
 return CWinApp::ExitInstance(); <!G%P4)  
} [L`w nP  
$Si|;j$?  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ==]BrhZK  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) &|Cd1z#?  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ $ts1XIK%  
#if _MSC_VER > 1000 ,(y6XUV~  
#pragma once pr.+r?la]  
#endif // _MSC_VER > 1000 0hv}*NYd  
5e|yW0o  
class CCaptureDlg : public CDialog ,.,spoV  
{ 4qvE2W}&  
 // Construction ZgI?#e  
 public: efX iZ  
  BOOL bTray; kT12  
  BOOL bRegistered; p"tCMB  
  BOOL RegisterHotkey(); Wz&[ cj  
  UCHAR cKey; _/[}PQC6G  
  UCHAR cMask; ,qu7XFYrY  
  void DeleteIcon(); z;Yo76P  
  void AddIcon(); L{F[>^1Sb  
  UINT nCount; 155vY  
  void SaveBmp(); F!qt=)V@w  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor o8c5~fG1  
  // Dialog Data /{%p%Q[X  
  //{{AFX_DATA(CCaptureDlg) reI4!,x  
  enum { IDD = IDD_CAPTURE_DIALOG }; .9VhDrCK  
  CComboBox m_Key; bx._,G  
  BOOL m_bControl; '4e, e|r  
  BOOL m_bAlt; Boj#r ,x  
  BOOL m_bShift; >hv8zHOO:  
  CString m_Path; * &O4b3R  
  CString m_Number; <s wfYT!N  
  //}}AFX_DATA kK%@cIXS3  
  // ClassWizard generated virtual function overrides CAbR+ y  
  //{{AFX_VIRTUAL(CCaptureDlg) vp&N)t_  
 public: tFvXVfml  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 6^NL>|?  
 protected: $i;m9_16  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support v7b +  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); lEXI<b'2  
  //}}AFX_VIRTUAL 2e^6Od!Y?  
  // Implementation 0@>  
 protected: JsK_q9]$e  
  HICON m_hIcon; Ev ]oPCeA  
  // Generated message map functions ,"U|gJn|^  
  //{{AFX_MSG(CCaptureDlg) k<A|+![  
  virtual BOOL OnInitDialog(); moCr4*jDX,  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 6(8zt"E  
  afx_msg void OnPaint(); ZO8r8 [  
  afx_msg HCURSOR OnQueryDragIcon(); ["0DXm%t  
  virtual void OnCancel(); iT=h }>  
  afx_msg void OnAbout(); B+4WnR1%T  
  afx_msg void OnBrowse(); )~be<G( a  
  afx_msg void OnChange(); $Y?[[>u  
 //}}AFX_MSG -58Sb"f  
 DECLARE_MESSAGE_MAP() 1qm _Qs&  
}; {xu~Dx  
#endif IylfMwLC  
#ja6nt8GC  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file J*D3=5&  
#include "stdafx.h" s)~Wcp'+M:  
#include "Capture.h" $J9/AFzO"  
#include "CaptureDlg.h" -GODM128 ^  
#include <windowsx.h> ]FEsN6  
#pragma comment(lib,"hook.lib") [vn"r^P  
#ifdef _DEBUG WXFC e@  
#define new DEBUG_NEW 3eN(Sw@p  
#undef THIS_FILE <RCeY(1  
static char THIS_FILE[] = __FILE__; ~tZy-1  
#endif t*wV<b  
#define IDM_SHELL WM_USER+1 n'9&q]GN|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); M,sZ8eeq  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \2[sUY<W  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; CF]#0*MI  
class CAboutDlg : public CDialog PwC^ ]e  
{ Jix;!("  
 public: ODCv^4}9  
  CAboutDlg(); lS |:4U.  
  // Dialog Data @m+FAdA 0  
  //{{AFX_DATA(CAboutDlg) 0,1)Sg*  
  enum { IDD = IDD_ABOUTBOX }; NszqI  
  //}}AFX_DATA TXbnK"XQ  
  // ClassWizard generated virtual function overrides g`I$U%a_2  
  //{{AFX_VIRTUAL(CAboutDlg) m+3]RIr&A  
 protected: 51'{Jx8  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9E2OCLWrE  
  //}}AFX_VIRTUAL /NUu^ N  
  // Implementation RU+F~K<  
 protected: Sh(XFUJ  
  //{{AFX_MSG(CAboutDlg) {nH*Wu*^  
  //}}AFX_MSG C] M{  
  DECLARE_MESSAGE_MAP() plgiQr #  
}; 7VW/v4n  
u& <NBxY  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) C j:  
{ I>:.fHvUC  
 //{{AFX_DATA_INIT(CAboutDlg) ,~>u<Wc!S  
 //}}AFX_DATA_INIT 4%*`' o$_  
} CGs5`a  
,:pKNWY)Q  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) b5?k)s2  
{ d=/a{lP\  
 CDialog::DoDataExchange(pDX); >x8~?)7z  
 //{{AFX_DATA_MAP(CAboutDlg) +^3 *Y"6Z  
 //}}AFX_DATA_MAP )NnkoCNeE  
} lin  
C A$R  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) J=B,$4)9  
 //{{AFX_MSG_MAP(CAboutDlg) cdTG ]n  
 // No message handlers ALt^@|!d  
 //}}AFX_MSG_MAP Hh'o:j(^  
END_MESSAGE_MAP() vPM 2cc/o  
K-n]m#U4o  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/)  \z?-  
: CDialog(CCaptureDlg::IDD, pParent) N:UA+  
{ ;fB!/u  
 //{{AFX_DATA_INIT(CCaptureDlg) w"AO~LF  
  m_bControl = FALSE; {jo"@&2S  
  m_bAlt = FALSE; H iEQs|""'  
  m_bShift = FALSE; 85ND 3F6q4  
  m_Path = _T("c:\\"); ,8+Jt@L  
  m_Number = _T("0 picture captured."); #Kt5+"+7  
  nCount=0; +?+iVLr!l}  
  bRegistered=FALSE; pXf5/u8&  
  bTray=FALSE; W{nDmG`yp  
 //}}AFX_DATA_INIT ^K[[:7Aem  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 $}.#0c8I  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ' eH Fa  
} M4K>/-9X+V  
NLZUAtx(  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) M 9/J!s  
{ p1fy)K2{,j  
 CDialog::DoDataExchange(pDX); ]Ab$IK Y  
 //{{AFX_DATA_MAP(CCaptureDlg) g>H\"cUv  
  DDX_Control(pDX, IDC_KEY, m_Key); X_#,5t=7  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); j]   
  DDX_Check(pDX, IDC_ALT, m_bAlt); U}SN#[*  
  DDX_Check(pDX, IDC_SHIFT, m_bShift);  &W? hCr  
  DDX_Text(pDX, IDC_PATH, m_Path); J" U!j  
  DDX_Text(pDX, IDC_NUMBER, m_Number); @.l?V6g9T  
 //}}AFX_DATA_MAP -bp7X{&  
} 6mC% zXR5  
V?4G~~F  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) *7K)J8kq  
//{{AFX_MSG_MAP(CCaptureDlg) 1VB{dgr  
 ON_WM_SYSCOMMAND() AUPTtc`#Y  
 ON_WM_PAINT() Bu#\W  
 ON_WM_QUERYDRAGICON() Mf`@X[-;  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) -_fh=}.n+"  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) v}&J*}_XZ  
 ON_BN_CLICKED(ID_CHANGE, OnChange) PZhpp"  
//}}AFX_MSG_MAP bf$4Z: Y  
END_MESSAGE_MAP() fe7DS)U  
zwdi$rM5  
BOOL CCaptureDlg::OnInitDialog() Q9sxI}D )R  
{ qrY]tb^K  
 CDialog::OnInitDialog(); X;3gKiD  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); >?ckBU9  
 ASSERT(IDM_ABOUTBOX < 0xF000); [-w+ACV~  
 CMenu* pSysMenu = GetSystemMenu(FALSE); *+>QKR7  
 if (pSysMenu != NULL) ePe/@g1K*  
 { "U iv[8B  
  CString strAboutMenu; \-RVPa8k  
  strAboutMenu.LoadString(IDS_ABOUTBOX); )}4xmf@g l  
  if (!strAboutMenu.IsEmpty()) cfUG)-]P~  
  { FWuk@t[<O  
   pSysMenu->AppendMenu(MF_SEPARATOR); i`EG80\[Z  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); qh/}/Sl;  
  } fC!+"g55  
 } (zhi/>suG  
 SetIcon(m_hIcon, TRUE); // Set big icon u;=a=>05IR  
 SetIcon(m_hIcon, FALSE); // Set small icon Xv?'*2J  
 m_Key.SetCurSel(0); |Whkq/Zg  
 RegisterHotkey(); !T1)tGrH  
 CMenu* pMenu=GetSystemMenu(FALSE); uOQl;}Lk5  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); A9ru]|?  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); %<;PEQQ|C  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _2nNCu (  
 return TRUE; // return TRUE unless you set the focus to a control }yMA s  
} n]snD1?KX  
8? &!@3n  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) N.|uPq$R  
{ ZqJyuTPv  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) {{Z3M>Q  
 { dS~#Lzm  
  CAboutDlg dlgAbout; o;7_*=i  
  dlgAbout.DoModal(); 5)<}a&;{  
 } {%XDr,myd  
 else Z)RV6@(  
 { Ib0@,yS[  
  CDialog::OnSysCommand(nID, lParam); c~{)vL0K  
 } H@BU/{  
} +BkmI\  
afj[HJbY  
void CCaptureDlg::OnPaint() SMbhJ}\O  
{ y<*/\]t9L[  
 if (IsIconic()) V"Y-|R  
 { c_)lTI4  
  CPaintDC dc(this); // device context for painting w $z]Z-  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); L(\o66a-rV  
  // Center icon in client rectangle T`SpIdzB.  
  int cxIcon = GetSystemMetrics(SM_CXICON); OjBg$f~0F  
  int cyIcon = GetSystemMetrics(SM_CYICON); E~'QC  
  CRect rect; Afo qCF  
  GetClientRect(&rect); gukKa  
  int x = (rect.Width() - cxIcon + 1) / 2; 4: S-  
  int y = (rect.Height() - cyIcon + 1) / 2; a29rD$  
  // Draw the icon $+p4X# _  
  dc.DrawIcon(x, y, m_hIcon); v="2p8@F  
 } Yb Dz{m  
 else ul[+vpH9  
 { Q*l_QnfG  
  CDialog::OnPaint(); +!)v=NY  
 } GN@(!V#/4  
} K*fh`Kz  
U8icP+Y  
HCURSOR CCaptureDlg::OnQueryDragIcon() o~={M7 m  
{ $C~OV@I  
 return (HCURSOR) m_hIcon; Tq`rc"&7u  
} dMjAG7U  
#ybtjsu'"U  
void CCaptureDlg::OnCancel() I.RmBUq):s  
{ WR@TH bU  
 if(bTray) w} 1~  
  DeleteIcon(); ieG%D HN  
  CDialog::OnCancel(); pZO`18z  
} ^Yu%JCN8g  
CiTjRJ-ZW)  
void CCaptureDlg::OnAbout() pv){R;f  
{ `w/`qG:dK  
 CAboutDlg dlg; GV(@(bI*  
 dlg.DoModal(); .Pi8c[  
} k\`~v$R3  
YQ#o3 sjs  
void CCaptureDlg::OnBrowse() TEt+At`]  
{ %W:]OPURK  
 CString str; F)^:WWVc#  
 BROWSEINFO bi; ~Bs=[TNd[  
 char name[MAX_PATH]; lgaE2`0 [3  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); y{]iwO;  
 bi.hwndOwner=GetSafeHwnd(); B0#JX MX9  
 bi.pszDisplayName=name; 6N {|;R@2  
 bi.lpszTitle="Select folder"; 6 s1lf!  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; pv9Z-WCix$  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Hj^_Cp]@*  
 if(idl==NULL) y7WO:X&  
  return; Aq:1  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); `UDB9Ca  
 str.ReleaseBuffer(); D4e!A@LJ  
 m_Path=str; <u%&@G$F>  
 if(str.GetAt(str.GetLength()-1)!='\\') 5 Yf T  
  m_Path+="\\"; _"R /k`8  
 UpdateData(FALSE); A6# 5 z  
} ilpP"B  
^ ;XJG9a0\  
void CCaptureDlg::SaveBmp() ?7"6d p_K  
{ =w <;tb  
 CDC dc; k x26nDT(  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Y}Gf%Xi,  
 CBitmap bm; YdNmnB %J  
 int Width=GetSystemMetrics(SM_CXSCREEN); |Xv]s61  
 int Height=GetSystemMetrics(SM_CYSCREEN); $m)[> C  
 bm.CreateCompatibleBitmap(&dc,Width,Height); )S 2GPn7  
 CDC tdc; 7U_OUUg  
 tdc.CreateCompatibleDC(&dc); `X ;2lgL  
 CBitmap*pOld=tdc.SelectObject(&bm); k1)=xv#S  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); cczV}m2)  
 tdc.SelectObject(pOld); z c7P2@  
 BITMAP btm; iR(jCD?) Y  
 bm.GetBitmap(&btm); ,/ bv3pE  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; F2 #s^4Ii  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); >;}q  
 BITMAPINFOHEADER bih; U#=5HzE  
 bih.biBitCount=btm.bmBitsPixel; B8sc;Z.  
 bih.biClrImportant=0; B%Vz -t  
 bih.biClrUsed=0; Tz{f 5c&  
 bih.biCompression=0; {,`)  
 bih.biHeight=btm.bmHeight; [c_o.`S_\  
 bih.biPlanes=1; d"Aer  
 bih.biSize=sizeof(BITMAPINFOHEADER); 1so9w89  
 bih.biSizeImage=size; ;+-Dg3  
 bih.biWidth=btm.bmWidth; sF+Bu'9A  
 bih.biXPelsPerMeter=0; b6y/o48  
 bih.biYPelsPerMeter=0; y2:~_MD  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); "{F e  
 static int filecount=0; Oj~4uT&"  
 CString name; MhXJ /bup  
 name.Format("pict%04d.bmp",filecount++); >azTAX6L3  
 name=m_Path+name; 8Z:T.Gc  
 BITMAPFILEHEADER bfh; qe{:9  
 bfh.bfReserved1=bfh.bfReserved2=0; |}Wm,J  
 bfh.bfType=((WORD)('M'<< 8)|'B'); B(TE?[ #  
 bfh.bfSize=54+size; # 2qDn^s  
 bfh.bfOffBits=54; oYn|>`+6:y  
 CFile bf; Kk?C   
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ;('(Yn7~  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); pX~X{JTaL)  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); M~jV"OF=  
  bf.WriteHuge(lpData,size); S%t*!  
  bf.Close(); Q"+)xj  
  nCount++; [x\?._>  
 } ,KyG^;Riy  
 GlobalFreePtr(lpData); :G\X  
 if(nCount==1) _)U[c;^6  
  m_Number.Format("%d picture captured.",nCount); U&}v1wdZ3  
 else VQ,;~^Td  
  m_Number.Format("%d pictures captured.",nCount); 8n1<nS<  
  UpdateData(FALSE); Pv3rDQ/Yt|  
} lI"~*"c`  
2LqJ.HH  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg)  ^D.u   
{ ft" t  
 if(pMsg -> message == WM_KEYDOWN) Z\9DtvV  
 { gfY1:0  
  if(pMsg -> wParam == VK_ESCAPE) BhcTPQsW  
   return TRUE; MJDW-KL-  
  if(pMsg -> wParam == VK_RETURN) 44p?x8(z*  
   return TRUE; 8,^2'dK34  
 } MaS"V`NI  
 return CDialog::PreTranslateMessage(pMsg); $pLJtQ  
} z:7 i@m  
e!hy,O{Pw  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) o$%I{}9x  
{ Pv#>j\OR&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ (+w>hCI  
  SaveBmp(); h .%)RW?  
  return FALSE; ^^FqN;  
} 9ER!K  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ A0f98 ?j^  
 CMenu pop; Uxl7O4J@H  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); A<$w }Fy;  
 CMenu*pMenu=pop.GetSubMenu(0); de<T5/  
 pMenu->SetDefaultItem(ID_EXITICON); AwQ7Oz|(  
 CPoint pt; QRL+-)DMc  
 GetCursorPos(&pt); iu9<]1k  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 5tG\5  
 if(id==ID_EXITICON) WH6Bs=G\}  
  DeleteIcon(); bAVlL&^@|  
 else if(id==ID_EXIT) b Y^K)0+^s  
  OnCancel(); (G<fvl!~  
 return FALSE; 2C59fXfd  
} vkgAI<  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); q0y#Y  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Fk*C8  
 AddIcon(); t 8,VRFV  
 return res; 4/J"}S  
} FIEA 'kUy  
OKO+(>A Q  
void CCaptureDlg::AddIcon() |K,[[D<R  
{ .s8u?1b  
 NOTIFYICONDATA data; &o]ic(74c?  
 data.cbSize=sizeof(NOTIFYICONDATA); &s>E~M0+J  
 CString tip; ?Tr\r1s]  
 tip.LoadString(IDS_ICONTIP); D%%@+3a  
 data.hIcon=GetIcon(0); D]StDOmM  
 data.hWnd=GetSafeHwnd(); "t!_b ma  
 strcpy(data.szTip,tip); "eb+O  
 data.uCallbackMessage=IDM_SHELL; !bGMVw6_  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; __OH gp 1  
 data.uID=98; *< ?~  
 Shell_NotifyIcon(NIM_ADD,&data); y|Vwy4tK9  
 ShowWindow(SW_HIDE); PC55A1(T  
 bTray=TRUE; =`W#R  
} =f\BAi  
lV ra&5  
void CCaptureDlg::DeleteIcon() p/WE[8U  
{ N*NGC!p`N  
 NOTIFYICONDATA data; yZyB.wT  
 data.cbSize=sizeof(NOTIFYICONDATA); oH>G3n|U^  
 data.hWnd=GetSafeHwnd(); _p^&]eQ+k#  
 data.uID=98; agUdPl$e\  
 Shell_NotifyIcon(NIM_DELETE,&data); .jK,6't^  
 ShowWindow(SW_SHOW); %SKJ#b  
 SetForegroundWindow(); og)f?4  
 ShowWindow(SW_SHOWNORMAL); U3OXO 1  
 bTray=FALSE; CjT]!D)s  
} 3^-yw`  
RJa1p YK  
void CCaptureDlg::OnChange() qw35LyL  
{ tuIQiWHbM  
 RegisterHotkey(); <#>{7" }  
} %Xjg/5G-  
Jnl#d0) -  
BOOL CCaptureDlg::RegisterHotkey() `Dp_c&9]  
{ Zg;%$ kSQ  
 UpdateData(); =OR "Bd:O  
 UCHAR mask=0; ?j|i|WUD  
 UCHAR key=0; jx[g;7~X  
 if(m_bControl) ,/Usyb,`  
  mask|=4; m!LJK`gA  
 if(m_bAlt) Zv^n  
  mask|=2; =Yt)b/0b9  
 if(m_bShift) xI( t!aYp  
  mask|=1; >yr1wVS  
  key=Key_Table[m_Key.GetCurSel()]; w3E#v&"=Y  
 if(bRegistered){ -![>aqWmj1  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); </-aG[Fi  
  bRegistered=FALSE; a"bael  
 } #.W^7}H  
 cMask=mask; ?f&O4H  
 cKey=key; gv}J"anD  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); }Jm~b9j  
 return bRegistered; D\-D ~G]x  
} )FSa]1t;x  
DC+l3N  
  四、小结 LnlDCbF;!  
i/{`rv*K[  
  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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