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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: WD c2Qt  
  )y&}c7xW  
  一、实现方法 !4cO]wh5  
69AgPAv<k  
  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: H)tnxD0)  
 Cg[]y1Ne  
#pragma data_seg("shareddata") +`4`OVE_#  
HHOOK hHook =NULL; //钩子句柄 ""Nu["|E  
UINT nHookCount =0; //挂接的程序数目 U+gOojRy{  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ,&[2z!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 d:jD  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey  yG -1g0  
static int KeyCount =0; *<?or"P  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 $ K1 /^  
#pragma data_seg() vcTWe$;Q  
*IL x-D5qr  
  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。 h$7rEs  
oxT..=-  
  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: ~Vq<nkWS  
PI@/jh  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Bwv@D4bii  
cKey,UCHAR cMask) 7 \)OWp  
{ )2t!= ua  
 BOOL bAdded=FALSE; foY=?mbL  
 for(int index=0;index<MAX_KEY;index++){ c^0Yu Bps[  
  if(hCallWnd[index]==0){ kNqSBzg  
   hCallWnd[index]=hWnd; {?tK]g#  
   HotKey[index]=cKey; mNS7/I\  
   HotKeyMask[index]=cMask; o;bK 7D  
   bAdded=TRUE; 3~ITvH,`s  
   KeyCount++; JQ|qg\[  
   break; %H OMX{~}#  
  } Du@?j7&l=$  
 } .R5[bXxe7  
 return bAdded; r_/=iYYJ  
} _hT-5)1r  
//删除热键 5A(zQ'6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) h#a;(F4_7  
{ xE%1C6~C<  
 BOOL bRemoved=FALSE; q2v:lSFY  
 for(int index=0;index<MAX_KEY;index++){ + <AD  
  if(hCallWnd[index]==hWnd){ nk.m G ny  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ j/"{tMqQp  
    hCallWnd[index]=NULL; ^wesuW@=  
    HotKey[index]=0; eHr|U$Rpo  
    HotKeyMask[index]=0; oL?(; `"&  
    bRemoved=TRUE; ? tre)  
    KeyCount--; :C6  
    break; =*EIe z*.x  
   } 242dT/j  
  } *=UxX ] 0y  
 } Pp-\#WJ  
 return bRemoved; E+wd9/;  
} f4.k%|]  
)X*?M?~\  
g%()8QxE1  
  DLL中的钩子函数如下: l(X8 cHAi  
Bx R% \  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) UUb n7&  
{ [KrWL;[1 <  
 BOOL bProcessed=FALSE; #sl_ BC9  
 if(HC_ACTION==nCode) c`:hEQs  
 { m# #( uSh  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 %jaB>4.A:  
   switch(wParam) p<>x qU  
   {  r(sQI# P  
    case VK_MENU: !<9sOvka{  
     MaskBits&=~ALTBIT; 1,cd[^`.  
     break; Gok8:,  
    case VK_CONTROL: / S  
     MaskBits&=~CTRLBIT; rGb7p`J  
     break; ~AbnksR  
    case VK_SHIFT: 08)X:@ w?  
     MaskBits&=~SHIFTBIT; mmk]Doy?#  
     break; 4R_Vi[i  
    default: //judge the key and send message HSq.0vYl6  
     break; fQ>=\*b9x^  
   } (_&W@:"z  
   for(int index=0;index<MAX_KEY;index++){ }1]E=!?)&  
    if(hCallWnd[index]==NULL) VayU   
     continue; \QF\Bh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R#j -Z#/"  
    { rMDo5Z2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2+KOUd&jS  
     bProcessed=TRUE; 3$Ecq|4J:  
    } G9?6qb:  
   } ^X2U A{  
  } u{%gB&nC  
  else if((lParam&0xc000ffff)==1){ //有键按下 *69 yB  
   switch(wParam) /8!s C D  
   { 5#jna9Xc  
    case VK_MENU: \BB(0Ah+t  
     MaskBits|=ALTBIT; M6(oJ*  
     break; +uR|0Jo8X  
    case VK_CONTROL: Z4S0{:XY  
     MaskBits|=CTRLBIT; eIVCg-l}  
     break; OkSJob  
    case VK_SHIFT: Z2z"K<Z W  
     MaskBits|=SHIFTBIT; 7%rSo^t,L  
     break; /Mq]WXq[V  
    default: //judge the key and send message D>& ;K{!  
     break; -fF1vJ7L  
   } [~&C6pR  
   for(int index=0;index<MAX_KEY;index++){ |12Cg>;j*n  
    if(hCallWnd[index]==NULL) F\m  
     continue; ^B9rt\,q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {0(:7IY,  
    { -9BKa~ DVQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); xw60l&s.\L  
     bProcessed=TRUE; l!2hwRR  
    } u3{gX{so  
   } Y-(),k_Q:  
  } (s?`*i:2  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 EZvB#cuL-  
   for(int index=0;index<MAX_KEY;index++){ ] iKFEd  
    if(hCallWnd[index]==NULL) BKoc;20;  
     continue; 1FfdW>ay*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /m,0H)w1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); _!FM^N}|  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 p/V  
   } +3VDapfin  
  } _Q<wb8+/  
 } S@suPkQ<>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ; n2|pC^  
} YT;b$>1v  
Mwdh]I,#  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: .K![<e Z  
/'|'3J]HP  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \'( @{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5ug?'TOj'  
4}{S8fGk%  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: MFHPh8P  
UA4Q9<>~  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) z-G|EAON"/  
{  & y1' J  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ?p{xt$<p  
 { HgG-r&r!2  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 &fBLPF%6  
  SaveBmp(); <}pwFl8C)  
  return FALSE; % '>S9Ja3  
 } !O$*/7  
 …… //其它处理及默认处理 7I;Give{  
} Zl]Zy}p*+  
9GnNL I{  
7^k`:Z  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 +Ux)m4}j  
NLDmZra  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 A.9,p  
W>b(hVBE  
  二、编程步骤 &]~z-0`$!  
@+",f]  
  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"; `Rj<qz^7  
mi|O)6>8n  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ]UnZc  
s~$kzEtjjU  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; _>HX Q6Hw  
UTQ$sg|7p  
  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; ~p~8T  
+3e(psdg  
  5、 添加代码,编译运行程序。 ]B>Y  +  
b?-%Uzp<  
三、程序代码 jIMaP T  
+MC>?rr_u  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL K5(?6hr;  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) e,Xvt5  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ uR"srn;^  
#if _MSC_VER > 1000 puS'9Lpp  
#pragma once 7Z>u|L($m  
#endif // _MSC_VER > 1000 GCrh4rxgg  
#ifndef __AFXWIN_H__ |0(Z)s,  
#error include 'stdafx.h' before including this file for PCH b:7;zOtF  
#endif i;^ e6A>  
#include "resource.h" // main symbols BQf}S +  
class CHookApp : public CWinApp Kp"mV=RG2T  
{ zMX7 #,  
 public: !TY4C`/  
  CHookApp(); \s;]Tg  
  // Overrides y]=v+Q*+  
  // ClassWizard generated virtual function overrides P0$q{ j  
  //{{AFX_VIRTUAL(CHookApp) u;DF$   
 public: Y',s|M1})\  
  virtual BOOL InitInstance(); UuxWP\~2  
  virtual int ExitInstance(); TQK>w'L  
  //}}AFX_VIRTUAL 'DF3|A],  
  //{{AFX_MSG(CHookApp) !-r@_tn|  
  // NOTE - the ClassWizard will add and remove member functions here. mLD0Lu_Ob3  
  // DO NOT EDIT what you see in these blocks of generated code ! zsI0Q47\  
  //}}AFX_MSG I"3Qdi  
  DECLARE_MESSAGE_MAP() ?)Lktn9%  
}; TJ`E/=J!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); uc%75TJ@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); YP~d1BWvf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -$;H_B+.  
BOOL InitHotkey(); C 0*k@kGy  
BOOL UnInit(); 6KhHS@Z  
#endif 8E/$nRfO d  
AEK* w4  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. [8Ub#<]]  
#include "stdafx.h" uf`o\wqU  
#include "hook.h" ~/[cZY @  
#include <windowsx.h> po"M$4`9  
#ifdef _DEBUG {AIP\  
#define new DEBUG_NEW RrLQM!~  
#undef THIS_FILE 5<4njo?k  
static char THIS_FILE[] = __FILE__; {#q<0l  
#endif .D^k0V  
#define MAX_KEY 100 2U>1-p&dn  
#define CTRLBIT 0x04 iUA2/ A  
#define ALTBIT 0x02 >;o^qi_$  
#define SHIFTBIT 0x01 Pf)<6?T  
#pragma data_seg("shareddata") -'{ioHt&X/  
HHOOK hHook =NULL; \WouTn  
UINT nHookCount =0; O<f_-n@G|  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey JU<<,0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ix^:qw;  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey yqlkf$?  
static int KeyCount =0; "eI-Y`O,  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift j3`:;'L  
#pragma data_seg() H` Q_gy5Z(  
HINSTANCE hins; +Qu~UK\   
void VerifyWindow(); -N5r[*>  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) S=[K/Kf-  
//{{AFX_MSG_MAP(CHookApp)  A`#v-  
// NOTE - the ClassWizard will add and remove mapping macros here. /lttJJDU  
// DO NOT EDIT what you see in these blocks of generated code! "rc}mq  
//}}AFX_MSG_MAP {_3ZKD(\  
END_MESSAGE_MAP() uVDB; 6  
?Pl>sCFm~  
CHookApp::CHookApp() l/LRr.x  
{ \I#lLP  
 // TODO: add construction code here, UN| "D]>/  
 // Place all significant initialization in InitInstance ]ZO^@sH  
} !i_5Xc H  
lhQ*;dMj%"  
CHookApp theApp; aChY5R  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) lqqY5l6j  
{ 6$SsdT|8B  
 BOOL bProcessed=FALSE; D8`,PXtV  
 if(HC_ACTION==nCode) zfi{SO l  
 { M0c"wi@S_  
  if((lParam&0xc0000000)==0xc0000000){// Key up y+Q!4A  
   switch(wParam)  +aP %H  
   { Js^ADUy  
    case VK_MENU: kf>'AbN  
     MaskBits&=~ALTBIT; !bH-(K{S6  
     break; `Up<;  
    case VK_CONTROL: JEY%(UR8  
     MaskBits&=~CTRLBIT; sF_.9G)S0  
     break; "TtK!>!.  
    case VK_SHIFT: a+\ Gz  
     MaskBits&=~SHIFTBIT; ~<v`&Gm?"  
     break; M%&`&{  
    default: //judge the key and send message }kL% l  
     break; q7 Uu 8JXF  
   } ?Dd2k%o  
   for(int index=0;index<MAX_KEY;index++){ hpWAQ#%oHm  
    if(hCallWnd[index]==NULL) ]N1$ioC#  
     continue; +t.T+` EG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A!iH g__/t  
    { ?{_dW=AQ1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); \jq1F9,  
     bProcessed=TRUE; Y0|~]J(B  
    } p4{?Rhb6  
   } Yz-b~D/=}  
  } J9poqp@`MG  
  else if((lParam&0xc000ffff)==1){ //Key down HaB=nLAT  
   switch(wParam) n{4&('NRFP  
   { Kh<v2  
    case VK_MENU: 'O\K Wj{  
     MaskBits|=ALTBIT; Dvd.Q/f  
     break; ^Po\:x%o  
    case VK_CONTROL: (nBJ,v)  
     MaskBits|=CTRLBIT; IeN!nK-  
     break; ( Y/ DMQ  
    case VK_SHIFT: :Oq!.uO  
     MaskBits|=SHIFTBIT; B TcxBh  
     break; WHE*NWz>q  
    default: //judge the key and send message h3@mN\=h'  
     break; L>@0Nne7  
   } Fdc bmQ  
   for(int index=0;index<MAX_KEY;index++)  J|6aa  
   { 6_zL#7E'  
    if(hCallWnd[index]==NULL) Mv4JF(,S  
     continue; Qt>yRt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f_raICO{R  
    { dqF--)Nb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 1f[!=p  
     bProcessed=TRUE; ;=h^"et  
    } HLk}E*.mC  
   } NTAPx=!1*  
  } _Seiwk &  
  if(!bProcessed){ ) 3Y E$,  
   for(int index=0;index<MAX_KEY;index++){ ;'gzR C  
    if(hCallWnd[index]==NULL) q%>L/KJ#  
     continue; 9QY)<K~a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 4,$x~m`N  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {R1jysG tD  
   } o`RTvG Xk  
  } r T* :1  
 } []LNNO],X  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *"9b?`E  
} ?`FI!3j  
NRoi` IIj  
BOOL InitHotkey() d54>nycU~N  
{ .P,\69g~A  
 if(hHook!=NULL){ Atfon&^  
  nHookCount++; GVEjB;  
  return TRUE; u{>5  
 } ,T&B.'cq  
 else ?]3`WJOj  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); \n<N>j@3  
  if(hHook!=NULL) gvy%`SSW  
   nHookCount++; i$og v2J  
  return (hHook!=NULL); 5[/ *UtB  
} Y=}b/[s6;  
BOOL UnInit() ^vG*8,^S=8  
{ @9vz%1B<l  
 if(nHookCount>1){ e j!C^  
  nHookCount--; 1Ete;r%5=  
  return TRUE; x5PQ9Bw,  
 } "F%cn@l  
 BOOL unhooked = UnhookWindowsHookEx(hHook); vRT1tOQ$  
 if(unhooked==TRUE){ jr!x)yd  
  nHookCount=0; )C|>M'g@v  
  hHook=NULL; )}u.b-Nt.  
 } w #1l)+  
 return unhooked; |(S=G'AtU  
} u[d8)+VX  
]MB ^0:F-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) pazFVzT  
{ y!aq}YS  
 BOOL bAdded=FALSE; ]Ff&zBJ  
 for(int index=0;index<MAX_KEY;index++){ r."Dc  
  if(hCallWnd[index]==0){ ~@sx}u  
   hCallWnd[index]=hWnd; +Do7rl  
   HotKey[index]=cKey; ze#LX4b I  
   HotKeyMask[index]=cMask; <[a9"G 7  
   bAdded=TRUE; MR+ndB<  
   KeyCount++; })"9TfC  
   break; -{L[Wt{1  
  } GD*6tk;5/  
 } fMLm_5(H  
 return bAdded; Yq;S%.  
} q"]-CGAa  
,VHvQU  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5RlJybN"o  
{ c]xpp;%]  
 BOOL bRemoved=FALSE; g~Q#U;]  
 for(int index=0;index<MAX_KEY;index++){ pu`|HaQaE  
  if(hCallWnd[index]==hWnd){ 2V F|T'h  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ "t\rjFw  
    hCallWnd[index]=NULL; 6dg[   
    HotKey[index]=0; NrL%]dl3/  
    HotKeyMask[index]=0; a(BC(^1!  
    bRemoved=TRUE; S)Ld^0w  
    KeyCount--; \h #vL  
    break; j4brDlo?@  
   } l"ih+%S  
  } tnKzg21%  
 } OwDjUKeN  
 return bRemoved; L {5zA5#m  
} M(/%w"R  
4Q3Q.(  
void VerifyWindow() Re.fS6y$>  
{ XPX{c|]>.  
 for(int i=0;i<MAX_KEY;i++){ 44_n5vp,T  
  if(hCallWnd!=NULL){ M)3h 4yQ  
   if(!IsWindow(hCallWnd)){ D;:lw]  
    hCallWnd=NULL; \6@}HFH  
    HotKey=0; <cWo]T`X!  
    HotKeyMask=0; x28Bz*O  
    KeyCount--; ]CHMkuP[k  
   } #Q|$&b  
  } }25{"R}K  
 } %oN^1a'&)  
} {OQ sGyR?  
q .?D{[2  
BOOL CHookApp::InitInstance() $RF"m"  
{ LY^BkH'  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); , :kCt=4%  
 hins=AfxGetInstanceHandle(); [& hdyLt  
 InitHotkey(); ;l?>+m@H  
 return CWinApp::InitInstance(); tpCEWdn5  
} c"0CHrd  
sY1*Wo lA  
int CHookApp::ExitInstance() ,~G[\2~p  
{ orL7y&w(v:  
 VerifyWindow(); wBmbn=>#S  
 UnInit();  ExnszFX*  
 return CWinApp::ExitInstance(); 1lx\Pz@ol  
} _ k>j?j-  
l sUQ7%f  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 1bvL  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 9`vse>,-hg  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 2@A7i<p  
#if _MSC_VER > 1000 ;N4mR6  
#pragma once wV(_=LF  
#endif // _MSC_VER > 1000 n}._Nb 5  
(r7~ccy4  
class CCaptureDlg : public CDialog V#sANi?mpo  
{ $x`U)pv  
 // Construction Q0M8 }  
 public: -|ee=BV  
  BOOL bTray; 1zl@$ Nt  
  BOOL bRegistered; Wc+ e>*  
  BOOL RegisterHotkey();  r5F#q  
  UCHAR cKey; y6G[-?"/Q  
  UCHAR cMask; R4qS,2E  
  void DeleteIcon(); V:IoeQ]-  
  void AddIcon(); i2swots  
  UINT nCount; V:l; 2rW  
  void SaveBmp(); 0eb`9yM  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor >0~y "~M  
  // Dialog Data tb_}w@:kU  
  //{{AFX_DATA(CCaptureDlg) 6%:'2;xM  
  enum { IDD = IDD_CAPTURE_DIALOG }; %=NqxF>>  
  CComboBox m_Key; u/hD9g~H7K  
  BOOL m_bControl; ]bX.w/=  
  BOOL m_bAlt; O0~[]3Y[=  
  BOOL m_bShift; f5`exfdHE  
  CString m_Path; s<^UAdLnl  
  CString m_Number; 7] ~'8  
  //}}AFX_DATA B%r)~?6DM  
  // ClassWizard generated virtual function overrides aP4r6lLv+  
  //{{AFX_VIRTUAL(CCaptureDlg) N(F9vZOs  
 public: VpJ2Qpd=  
  virtual BOOL PreTranslateMessage(MSG* pMsg); GL (YC-{  
 protected: II[qWs>RG[  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support YJr@4!j*  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); dyu~T{  
  //}}AFX_VIRTUAL BDcl1f T  
  // Implementation 'JRkS'ay  
 protected: "*TnkFTR  
  HICON m_hIcon; =k0l>)  
  // Generated message map functions +fKLCzj  
  //{{AFX_MSG(CCaptureDlg) o>j3<#?  
  virtual BOOL OnInitDialog(); o<%Sr*  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); < v0 d8  
  afx_msg void OnPaint(); :a`l_RMU  
  afx_msg HCURSOR OnQueryDragIcon(); YMm Fpy  
  virtual void OnCancel(); =FdS'<GM  
  afx_msg void OnAbout(); S* <: He&1  
  afx_msg void OnBrowse(); oBIKt S*L  
  afx_msg void OnChange(); !&! sn"yD  
 //}}AFX_MSG (8{h I  
 DECLARE_MESSAGE_MAP() t'7)aJMP  
}; = "Dmfy7  
#endif o3%+FWrVTS  
Fet>KacTht  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file o2Z# 5-  
#include "stdafx.h" H?O*  
#include "Capture.h" X;zy1ZH  
#include "CaptureDlg.h" }X}fX#[  
#include <windowsx.h> ?;}2 Z)  
#pragma comment(lib,"hook.lib") &4p:2,|r9  
#ifdef _DEBUG xNl_Q8Z?R^  
#define new DEBUG_NEW dZ;cs c@xv  
#undef THIS_FILE 5a4;d+  
static char THIS_FILE[] = __FILE__; O(wt[AEA  
#endif E[ e ''  
#define IDM_SHELL WM_USER+1 8Gs{Zfp!D  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?$8OVq.w,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K{"(|~=U  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ?l bK;Kv  
class CAboutDlg : public CDialog r=s2wjk  
{ |8V+(Vzl  
 public: \W #M]Q  
  CAboutDlg(); MheP@ [w|@  
  // Dialog Data 8]+hfB/  
  //{{AFX_DATA(CAboutDlg) 8+ Hho@=  
  enum { IDD = IDD_ABOUTBOX }; 'rU 5VrK  
  //}}AFX_DATA h.G/HHz  
  // ClassWizard generated virtual function overrides DTgF,c  
  //{{AFX_VIRTUAL(CAboutDlg) z q(AN<  
 protected: YHg4WW$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C#vU'RNpl  
  //}}AFX_VIRTUAL 3kQky  
  // Implementation q[**i[+%  
 protected: XCQ =`3f  
  //{{AFX_MSG(CAboutDlg) LLV:E{`p  
  //}}AFX_MSG <C]s\ "o-`  
  DECLARE_MESSAGE_MAP() :8\z 0  
}; 6fQQKM@a|  
i!sKL%z}  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 7e>n{rl  
{ r!j_KiUy  
 //{{AFX_DATA_INIT(CAboutDlg) ~eE2!/%9  
 //}}AFX_DATA_INIT z l@ <X0q  
} {n2jAR9nq  
|)yO] pB:  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) f~8Xue,l"  
{ >`\~=ivrD  
 CDialog::DoDataExchange(pDX); YV 2T$#7u  
 //{{AFX_DATA_MAP(CAboutDlg) #L[Atx  
 //}}AFX_DATA_MAP O`Nzn~),x  
} _ jF, k>F  
#t po@pJsE  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) *|ubH?71%Y  
 //{{AFX_MSG_MAP(CAboutDlg) I}$Y[Jve  
 // No message handlers n$B=Vt,  
 //}}AFX_MSG_MAP c?j/ H$  
END_MESSAGE_MAP() ~ B1)!5Z  
(4x`/  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ZVk_qA%  
: CDialog(CCaptureDlg::IDD, pParent) /oE@F178  
{ \_CC6J0k  
 //{{AFX_DATA_INIT(CCaptureDlg) [y64%|m  
  m_bControl = FALSE; d#Ql>PrY  
  m_bAlt = FALSE; ,7z.%g3+z  
  m_bShift = FALSE; 1Ep!U#Del  
  m_Path = _T("c:\\"); G-9]z[\#  
  m_Number = _T("0 picture captured."); l<! ?`V6}  
  nCount=0; A0 x*feK?  
  bRegistered=FALSE; m".8-  
  bTray=FALSE; ]Dd=q6  
 //}}AFX_DATA_INIT p.gi8%f`  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 i|y8n7c  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); rp+&ax}Wh  
} 68W&qzw.[r  
FE" ksi 9  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) F@)wi0  
{ M7BJ$fA0E  
 CDialog::DoDataExchange(pDX); Nz\=M|@(#  
 //{{AFX_DATA_MAP(CCaptureDlg) gb( a`  
  DDX_Control(pDX, IDC_KEY, m_Key); 0a ZplE,  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ggXg4~WL  
  DDX_Check(pDX, IDC_ALT, m_bAlt); z3[ J>  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); |ILj}4ZA7  
  DDX_Text(pDX, IDC_PATH, m_Path); -Wb/3 X  
  DDX_Text(pDX, IDC_NUMBER, m_Number); fu"#C}{  
 //}}AFX_DATA_MAP q% 2cx@c  
} &X }GJLC3  
Mx4 <F "9  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 4&&((H  
//{{AFX_MSG_MAP(CCaptureDlg) edx-R-Dc-1  
 ON_WM_SYSCOMMAND() `og 3P:y  
 ON_WM_PAINT() Zu,rf9LMj  
 ON_WM_QUERYDRAGICON() 1#gveHm]-G  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) mi`!'If0)  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) -1DQO|q#  
 ON_BN_CLICKED(ID_CHANGE, OnChange) M._9/ *C U  
//}}AFX_MSG_MAP S[n ;u-U  
END_MESSAGE_MAP() ;r B2Q H]  
U4w^eWzP  
BOOL CCaptureDlg::OnInitDialog() wG ua"@IE  
{ xi %u)p  
 CDialog::OnInitDialog(); T;-&3  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 5k)/SAU0  
 ASSERT(IDM_ABOUTBOX < 0xF000); a;r,*zZ="  
 CMenu* pSysMenu = GetSystemMenu(FALSE); jhr: QS/9  
 if (pSysMenu != NULL) >\+c@o[  
 { &O/;YGEAB  
  CString strAboutMenu; " ;8H;U`  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ]p:s5Q  
  if (!strAboutMenu.IsEmpty()) J-P> ~ L"  
  { %scSp&X  
   pSysMenu->AppendMenu(MF_SEPARATOR); }4Ef31X8q  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); "eA4JL\%)  
  } q@1b{q#C5  
 } z' z_6]5  
 SetIcon(m_hIcon, TRUE); // Set big icon K -cRNt  
 SetIcon(m_hIcon, FALSE); // Set small icon Y`eUWCD  
 m_Key.SetCurSel(0); h8iic  
 RegisterHotkey(); nYhI0q  
 CMenu* pMenu=GetSystemMenu(FALSE); lyc ]E 9  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); [K1RP.  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Oi+9kk e  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); dUegHBw_`R  
 return TRUE; // return TRUE unless you set the focus to a control $@QF<?i~  
} ue"?n2  
6q-X$  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) o EXN$SIs  
{ 4! ]28[2B6  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 5?9K%x'b  
 { (,*e\o  
  CAboutDlg dlgAbout; 7:awUoV8f  
  dlgAbout.DoModal(); 2K[Y|.u8>q  
 } U$-Gc[=|  
 else OHTJQ5%zL  
 { Cak `}J 2  
  CDialog::OnSysCommand(nID, lParam); ' 5`w5swbc  
 } (1Q G]1q  
} 4HG;v|Cp  
XRA RgWj  
void CCaptureDlg::OnPaint() -9W)|toWb"  
{ O~D>F*_^j  
 if (IsIconic()) YGFE(t;lPU  
 { 2NMS '"8  
  CPaintDC dc(this); // device context for painting g-)izPX  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); L+VqTt  
  // Center icon in client rectangle W/e6O??O  
  int cxIcon = GetSystemMetrics(SM_CXICON); ~U"puEftbs  
  int cyIcon = GetSystemMetrics(SM_CYICON); b/"&E'5-`\  
  CRect rect; "V|&s/9  
  GetClientRect(&rect); i286 J.  
  int x = (rect.Width() - cxIcon + 1) / 2; jNV)=s^ed[  
  int y = (rect.Height() - cyIcon + 1) / 2; H%y!lR{c^D  
  // Draw the icon <vS3 [(  
  dc.DrawIcon(x, y, m_hIcon); 4OX|pa  
 } m/TjXA8_  
 else e x" E50  
 { L{PH8Xl_  
  CDialog::OnPaint(); IP<]a5  
 } >(T)9fKF  
} Ix~_.&  
Lh`B5  
HCURSOR CCaptureDlg::OnQueryDragIcon() \MhSIlM#  
{ ,, S]_S  
 return (HCURSOR) m_hIcon; ^phgNzD  
} qrdA4S  
m ^?a/  
void CCaptureDlg::OnCancel() f0!i<9<  
{ b&]_5 GGc  
 if(bTray) r2!\Ts5v  
  DeleteIcon(); H 5\k`7R  
  CDialog::OnCancel(); hJ|zX  
} %BBM%Lj  
aUZh_<@  
void CCaptureDlg::OnAbout() iG+hj:5  
{ k9Pwf"m|](  
 CAboutDlg dlg; _`|te|ccF  
 dlg.DoModal(); }(MI}o}  
} qK=uSL o\+  
nev@ykP6  
void CCaptureDlg::OnBrowse() o,(]w kF  
{ cl,\N\  
 CString str; +q<G%PwbV  
 BROWSEINFO bi; 2&b?NqEeZ  
 char name[MAX_PATH]; %mF:nU4  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); -/)>DOgUq  
 bi.hwndOwner=GetSafeHwnd(); H<N$z 3k  
 bi.pszDisplayName=name; 9szUN;:ZZ  
 bi.lpszTitle="Select folder"; `|rF^~6(dR  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; VA D9mS^~  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); *h([ai"1-  
 if(idl==NULL) A  [c1E[  
  return; p<[gzmU9\b  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); =5l20 Um  
 str.ReleaseBuffer(); _EEOBaZ  
 m_Path=str; 3aX/)v.:4  
 if(str.GetAt(str.GetLength()-1)!='\\') =(aA`:Nl  
  m_Path+="\\"; -/w#f&Y+]8  
 UpdateData(FALSE); :o"9x,  
} mZG)#gW[  
qp##>c31X  
void CCaptureDlg::SaveBmp() 7oWT6Qa5  
{ 8GN_ 3pT  
 CDC dc; ,;D$d#\"  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Acix`-<  
 CBitmap bm; C srxi'Pe  
 int Width=GetSystemMetrics(SM_CXSCREEN); 70Z#Ej  
 int Height=GetSystemMetrics(SM_CYSCREEN); `W=3_  
 bm.CreateCompatibleBitmap(&dc,Width,Height); #];b+ T  
 CDC tdc; Ga$J7 R  
 tdc.CreateCompatibleDC(&dc); NB^+Hcb$  
 CBitmap*pOld=tdc.SelectObject(&bm); ojva~mnFf  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); +`RQ ^9  
 tdc.SelectObject(pOld); 9'" F7>d  
 BITMAP btm; K`vc&uf  
 bm.GetBitmap(&btm); '( ( pW  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ' pN[H\Ia  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); I5%#A/|z  
 BITMAPINFOHEADER bih; fFe{oR   
 bih.biBitCount=btm.bmBitsPixel; d8!yV~Ka  
 bih.biClrImportant=0; '-KYeT\;  
 bih.biClrUsed=0; 14DHU  
 bih.biCompression=0; 5Q$.q &,  
 bih.biHeight=btm.bmHeight; iZ( U]  
 bih.biPlanes=1; 'W_u1l/  
 bih.biSize=sizeof(BITMAPINFOHEADER); _TbQjE&6  
 bih.biSizeImage=size; sF4+(9=  
 bih.biWidth=btm.bmWidth; U0J_ 3W  
 bih.biXPelsPerMeter=0; 1OI/,y8}  
 bih.biYPelsPerMeter=0; G(;hJ'LT  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); WeiDg,]e$b  
 static int filecount=0; |PNPOj0  
 CString name; m+!T $$W  
 name.Format("pict%04d.bmp",filecount++); 63PSYj(y  
 name=m_Path+name; ^0tO2$  
 BITMAPFILEHEADER bfh; }N0$DqP  
 bfh.bfReserved1=bfh.bfReserved2=0; Hy~+|hLvh  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Rt+ak}  
 bfh.bfSize=54+size; 8 \BGL  
 bfh.bfOffBits=54; @{q:179w^  
 CFile bf; cF V[k'F  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ +Y! P VMF  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); DQI b57j  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Rp0`%}2 o  
  bf.WriteHuge(lpData,size); asc Y E  
  bf.Close(); "xdu h3/~=  
  nCount++; fMm.V=/+  
 } =pk5'hBAi  
 GlobalFreePtr(lpData); p6c&vEsNj  
 if(nCount==1) 1DR ih>+#  
  m_Number.Format("%d picture captured.",nCount); kMx^L;:n  
 else @>Bgld&vl  
  m_Number.Format("%d pictures captured.",nCount);  eQU~A9  
  UpdateData(FALSE); SNOML7pd  
} F%ffnEJg  
xP7#`S6W  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) )R^&u`k  
{ nh'TyUd!  
 if(pMsg -> message == WM_KEYDOWN) \=&F\EV  
 { M/a40uK  
  if(pMsg -> wParam == VK_ESCAPE) !)4'[5t"U  
   return TRUE; =@ d/SZ|(E  
  if(pMsg -> wParam == VK_RETURN) /g)(  
   return TRUE; +R2+?v6  
 } <N(r -  
 return CDialog::PreTranslateMessage(pMsg); 90Bn}@t=Q  
} IgyoBfj\d  
5q,ZH6\ {  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) s1>d)2lX  
{ "&%Lhyt  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 7U1^=Y@t}  
  SaveBmp(); H8!)zZ  
  return FALSE; 5"9 '=LV~  
} OK" fFv  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ #ZyY(S1.  
 CMenu pop; Zg&o][T  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6Z#$(oC  
 CMenu*pMenu=pop.GetSubMenu(0); G0Y]-*1  
 pMenu->SetDefaultItem(ID_EXITICON); f\vMdY  
 CPoint pt; N;` jz(r  
 GetCursorPos(&pt); >&YUV.mLY  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %?X6TAtH  
 if(id==ID_EXITICON) qYP;`L}o#  
  DeleteIcon(); J{U 171  
 else if(id==ID_EXIT) ]o?r( 1  
  OnCancel(); f=hT o!i  
 return FALSE; (91 YHhk{  
} gvFs$X*^:  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); zQ#2BOx1  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 6L<QKE=  
 AddIcon(); %Y-5L;MI  
 return res; e'A 1%g)  
} HChlkj'7w0  
d6e$'w@(\T  
void CCaptureDlg::AddIcon() M2Jb<y]  
{ hem>@Bp'V  
 NOTIFYICONDATA data; 1]a\uq}  
 data.cbSize=sizeof(NOTIFYICONDATA); P%aNbMg  
 CString tip; ?*^HZ~O1  
 tip.LoadString(IDS_ICONTIP); 37 b6w6{D  
 data.hIcon=GetIcon(0); 5t,X;  
 data.hWnd=GetSafeHwnd(); x~QZVL=:  
 strcpy(data.szTip,tip); /:@)De(S  
 data.uCallbackMessage=IDM_SHELL; 4^Og9}bm  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Z+Cjg #+  
 data.uID=98; _BoYy JQH  
 Shell_NotifyIcon(NIM_ADD,&data); _<%YLv  
 ShowWindow(SW_HIDE); /'a\$G"%6  
 bTray=TRUE; w0X})&,{`m  
} FQ"ED:lks  
= N^Ec[u(l  
void CCaptureDlg::DeleteIcon() 4rLc] >  
{ #T=e p0  
 NOTIFYICONDATA data; \h/)un5  
 data.cbSize=sizeof(NOTIFYICONDATA); dpvEY(Ds  
 data.hWnd=GetSafeHwnd(); }g& KT!r  
 data.uID=98; `=lo.c  
 Shell_NotifyIcon(NIM_DELETE,&data); /?NfU.+K  
 ShowWindow(SW_SHOW); RiZ)#0  
 SetForegroundWindow(); 7J1f$5$m5  
 ShowWindow(SW_SHOWNORMAL); O%f{\Fr  
 bTray=FALSE; vNHvuw K  
} 3el/,v|qj  
!l5@L\   
void CCaptureDlg::OnChange() E9\u^"GVO  
{ v7/k0D .  
 RegisterHotkey(); ! u@JH`  
} ZypK''&oc  
\M;cF "e-S  
BOOL CCaptureDlg::RegisterHotkey() -/:!AxIH  
{ NiYT%K%  
 UpdateData(); }.1}yz^y  
 UCHAR mask=0; #&b<D2d  
 UCHAR key=0; pVM1%n:#  
 if(m_bControl) *v$j n  
  mask|=4; _*cKu>,O  
 if(m_bAlt) [A'e7Do%'  
  mask|=2; j\HZ5  
 if(m_bShift) #^tnRfS"  
  mask|=1; %]1te*_  
  key=Key_Table[m_Key.GetCurSel()]; |]~],  
 if(bRegistered){ mQ9y{}t=4  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); mV0u:ws  
  bRegistered=FALSE; 8)>4ZNXz  
 } A2!pbeG  
 cMask=mask; e8M0Lz#}  
 cKey=key; DVt^O [  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); p|em_!H"SH  
 return bRegistered; N2 t`  
} SmAii}-jf  
kQp*+ras  
  四、小结 )NK#}c~5  
x)pR^t7u8  
  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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