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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: e7{6<[k3+$  
  iQ8{N:58DN  
  一、实现方法 qK#"uU8B  
zF[Xem  
  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: ) xa )$u  
$hcv}<$/  
#pragma data_seg("shareddata") FZ+2{wIV^  
HHOOK hHook =NULL; //钩子句柄 R8u8jG(4  
UINT nHookCount =0; //挂接的程序数目  aY(s &  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 DT>`.y%2W  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 F9K`N8wlu  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey )D6 i {I0  
static int KeyCount =0; gWa0x-  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 j y5[K.  
#pragma data_seg() % H"  
]wEI *c(  
  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。 C=q&S6/+  
h'=)dFw7  
  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: { >izfG,\  
g_P98_2f.k  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR y'odn ;  
cKey,UCHAR cMask) m[2[9 bQ0  
{ n/Fxjf0W  
 BOOL bAdded=FALSE; P[q>;Fx*  
 for(int index=0;index<MAX_KEY;index++){ %#v$d  
  if(hCallWnd[index]==0){ 6wwbH}*=?  
   hCallWnd[index]=hWnd; NcF>}f,}\  
   HotKey[index]=cKey; \EoE/2"<  
   HotKeyMask[index]=cMask; B F gxa#De  
   bAdded=TRUE; S}U_uZ$b  
   KeyCount++; Y 'X!T8  
   break; IO"P /Q  
  } ciml:"nQ  
 } wdBB x\FP  
 return bAdded; a]V8F&)g#  
} <@ ts[p.  
//删除热键 l:e C+[_;>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) KO#kIM-  
{ k# Ho7rS&  
 BOOL bRemoved=FALSE; kJf0..J[#<  
 for(int index=0;index<MAX_KEY;index++){ 6c-'CW  
  if(hCallWnd[index]==hWnd){ =lk'[P/p`  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $A{$$8P  
    hCallWnd[index]=NULL; f:~G)  
    HotKey[index]=0; <|Lz#iV37  
    HotKeyMask[index]=0; [u K,.G  
    bRemoved=TRUE; UV}:3c6ZX  
    KeyCount--; :M{ )&{D  
    break; )z74,n7-  
   } 4vG-d)"M2  
  } O4oN)  
 } y|MhV/P04  
 return bRemoved; 4To$!=  
} x  zF  
2INpo  
,pTZ/#vP#  
  DLL中的钩子函数如下: 9ETdO,L)f  
Y#V(CIDe  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) x+6z9{O  
{ 'h6G"=+  
 BOOL bProcessed=FALSE; O^-QqCZE  
 if(HC_ACTION==nCode) gTTKjlI [  
 { R,PN?aj  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 sgK =eBE  
   switch(wParam) w2'z~\dG8  
   {  Z'k?lkB2i  
    case VK_MENU: 2'M5+[8y8  
     MaskBits&=~ALTBIT; c)^A|{,G  
     break; AhOBbss]q  
    case VK_CONTROL: H'YKj'  
     MaskBits&=~CTRLBIT; Zh;}Q(w  
     break; t6KKfb  
    case VK_SHIFT: > _sSni  
     MaskBits&=~SHIFTBIT; Eb9h9sjv  
     break; i{$P.i/&  
    default: //judge the key and send message H9TeMY  
     break; 8i73iTg(  
   } Z9 ws{8@_  
   for(int index=0;index<MAX_KEY;index++){ w)vpo/?  
    if(hCallWnd[index]==NULL) v mkiw1  
     continue; b~>@x{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1=IOio4U  
    { Hi K+}?I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2oahQ: }B  
     bProcessed=TRUE; wn_ >Vi1  
    } fuA] y4A  
   } MYara;k  
  } `{Oqb  
  else if((lParam&0xc000ffff)==1){ //有键按下 Wq}6RdY$ZA  
   switch(wParam) !*&5O~dfN  
   { {4 vWSb  
    case VK_MENU: Y_y!$jd(N  
     MaskBits|=ALTBIT; iY@}Q "  
     break; MH'%E^n `  
    case VK_CONTROL: <eSg%6z  
     MaskBits|=CTRLBIT; l 7dm@S  
     break; 3 I%N4K4  
    case VK_SHIFT: l{8O'4;  
     MaskBits|=SHIFTBIT; oO?+2pTQV  
     break; Q!IqvmO  
    default: //judge the key and send message lW#2ox  
     break; a6z0p%sIZ  
   } {e2ZW]  
   for(int index=0;index<MAX_KEY;index++){ MNe/H\  
    if(hCallWnd[index]==NULL) RE4#a 2  
     continue; RF2I_4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I(BJ1 8F$  
    { "u~` ZV(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); H*<E5^#dw  
     bProcessed=TRUE; ke W7pN?  
    } _,K[kVn  
   } Ofoh4BL'1@  
  } R>:D&$[RD  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 RZpjr !R  
   for(int index=0;index<MAX_KEY;index++){ R{A$|Ipaq  
    if(hCallWnd[index]==NULL) JleClB(2n/  
     continue; _IU5HT}2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 6j {ynt  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 85|u;Fxf  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 K-Pcew^?  
   } 1qn/*9W}=  
  } R1Rk00Ow:  
 } _/P;`@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "\;n t5L  
} =m (u=|N3  
0k\,z(e  
  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: kP('X/  
M+ <SSi"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^5~x*=_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); FYC]^D  
q$v0sTk0Y  
  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: snkMxc6c[  
s@%>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) NF |[j=?  
{ 4,QA {v  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) $/Q\B(X3  
 { -9+$z|K  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 a $'U?%  
  SaveBmp(); p8.JJt^  
  return FALSE; 525^/d6v  
 } N|)e {|k  
 …… //其它处理及默认处理 N&k\X]U  
} Z)(#D($-  
jYAm}_?No  
sEw ?349Bz  
  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。 B!)9 >  
Snmv  
  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。 3My}u>  
j<Pw0?~s6  
  二、编程步骤 [N[4\W!!  
UjJ&P)  
  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"; L)7{_s  
Q8l vwip  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; gxI/MD~!>  
c(8>oeKyD  
  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; k:j?8o3  
`]19}GK~xo  
  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; HtE^7i*_  
438r]f?0|{  
  5、 添加代码,编译运行程序。 DrBkR` a?  
]1GyEr:  
三、程序代码 9$[MM*r  
xo ^|d3  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL {s6#h#U  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) rWO#h{  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ gV:0&g\v  
#if _MSC_VER > 1000 86qQ"=v  
#pragma once dn42'(p@G  
#endif // _MSC_VER > 1000 $'!n4}$}  
#ifndef __AFXWIN_H__ a.O"I3{?h  
#error include 'stdafx.h' before including this file for PCH (<OmYnm  
#endif T51oNO%^  
#include "resource.h" // main symbols  1v3  
class CHookApp : public CWinApp ?0z/i^I  
{ M,{;xf  
 public: _m a;b<I/<  
  CHookApp(); gLo&~|=L-  
  // Overrides >U4bK^/Bp  
  // ClassWizard generated virtual function overrides P$ b5o  
  //{{AFX_VIRTUAL(CHookApp)  8QKu  
 public: W S9:*YH  
  virtual BOOL InitInstance(); i8EKzW  
  virtual int ExitInstance(); w}07u5  
  //}}AFX_VIRTUAL ~_ovQ4@  
  //{{AFX_MSG(CHookApp) }p)a 7xn}  
  // NOTE - the ClassWizard will add and remove member functions here. yVPFH~1@\  
  // DO NOT EDIT what you see in these blocks of generated code ! Bv*VNfUm  
  //}}AFX_MSG %%wngiz\  
  DECLARE_MESSAGE_MAP() nddCp~NX  
}; e cvZwL  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 9/&1lFKJ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0f+]I=1\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xTcY&   
BOOL InitHotkey(); #^-'q`)  
BOOL UnInit(); ~xPetkl@  
#endif 4 #lLC-k  
y^{ 4}^u-^  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. [5b[ztN%  
#include "stdafx.h" 0U.Ld:  
#include "hook.h" !HXsxNe  
#include <windowsx.h> ^ 6t"A  
#ifdef _DEBUG Cf<TDjU`|  
#define new DEBUG_NEW b3GTsX\2|  
#undef THIS_FILE &s\,+d0  
static char THIS_FILE[] = __FILE__; ^b.fci{1m  
#endif <X97W\  
#define MAX_KEY 100 9(KffnE^  
#define CTRLBIT 0x04 iN@|08  
#define ALTBIT 0x02 <P Vmr2Jp"  
#define SHIFTBIT 0x01 q}g0-Da  
#pragma data_seg("shareddata") lKRp9isn^  
HHOOK hHook =NULL; >M m.MNU  
UINT nHookCount =0; 3] U/^f3  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey %uP/v\l  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT TUp%Cx  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ]@}@G[e#[  
static int KeyCount =0; &(x>J:b  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift sJg3WN  
#pragma data_seg() T Q {8 ee{  
HINSTANCE hins; ,~K4+ t_  
void VerifyWindow(); HE2t0sAYX  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) /cZcfCW  
//{{AFX_MSG_MAP(CHookApp) *9r 32]i;  
// NOTE - the ClassWizard will add and remove mapping macros here. G%%F6)W  
// DO NOT EDIT what you see in these blocks of generated code! ,zBc-Cm  
//}}AFX_MSG_MAP 9*?YES'6  
END_MESSAGE_MAP() c8cGIAOY)  
UyNP:q:  
CHookApp::CHookApp() (i@(ZG]/  
{ t$Ua&w  
 // TODO: add construction code here, "MOmJYH  
 // Place all significant initialization in InitInstance B=%YD"FAv  
} N,cj[6;T%  
Tl^)O^/  
CHookApp theApp; <g8{LG0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <S@2%%W  
{ ;/^O7KM-  
 BOOL bProcessed=FALSE; j8t_-sU9 i  
 if(HC_ACTION==nCode) !6s]p%{V  
 { 3ZYrNul"  
  if((lParam&0xc0000000)==0xc0000000){// Key up @c,=c+-  
   switch(wParam) :\1vy5 _  
   { W5 RZsS]  
    case VK_MENU: -r{]9v2j  
     MaskBits&=~ALTBIT; lWU? R  
     break; &G+:t)|S  
    case VK_CONTROL: 2|+4xqNJm  
     MaskBits&=~CTRLBIT; kr]_?B(r  
     break; YdAC<,e&A  
    case VK_SHIFT: x C>>K6Nb  
     MaskBits&=~SHIFTBIT; 00A2[gO9  
     break; LFQP ysC  
    default: //judge the key and send message K5d>{c  
     break; xkz`is77Y@  
   } t\<*Q3rl-  
   for(int index=0;index<MAX_KEY;index++){ o6:p2W  
    if(hCallWnd[index]==NULL) `+WQ^dP@  
     continue; 'KNUPi|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) PF;`mdi-,  
    { !=+hU/e  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); YW-Ge  
     bProcessed=TRUE; `&A-m8X  
    } E>}3MfL  
   } ?)+I'lW!  
  } }Ot2; T  
  else if((lParam&0xc000ffff)==1){ //Key down 54&&=NVs|  
   switch(wParam) RYX=;n  
   { *wz62p  
    case VK_MENU: #!M;4~Sfx  
     MaskBits|=ALTBIT; HG})V PBa  
     break; 9'\*Ip^  
    case VK_CONTROL: ob=IaZ@?  
     MaskBits|=CTRLBIT; 9KZLlEk5O  
     break; %|?PG i@5  
    case VK_SHIFT: x$V[xX  
     MaskBits|=SHIFTBIT; /57)y_ \  
     break; q?Mmkh)g  
    default: //judge the key and send message )G9,5[  
     break; e5cvmUF_W  
   } / =:X,^"P  
   for(int index=0;index<MAX_KEY;index++) c< g{ &YJ  
   { j}DG +M  
    if(hCallWnd[index]==NULL) p4wXsOQ}  
     continue; 5A"OL6ty  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~FZ=  
    { '\Hh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); U_Va'7  
     bProcessed=TRUE; ;jpsH?3g  
    } .AHww7  
   } T$9tO{  
  } x-s]3'!L  
  if(!bProcessed){ Y-:{a1/RKo  
   for(int index=0;index<MAX_KEY;index++){ ucC'SS  
    if(hCallWnd[index]==NULL) Ps7Bt(/  
     continue; t{ScK%S6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ]1n =O"vE  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); D& #ph%U,P  
   } ^T/d34A;SP  
  } w#`E;fN'  
 } {3=]cLtt  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); x AR9* <-  
} '|l1-yD_  
4P}<86xk  
BOOL InitHotkey() #a"gW,/K  
{ IG~d7rh"  
 if(hHook!=NULL){ dJd(m&.|N  
  nHookCount++; wloQk(T<W  
  return TRUE; xD<:'-ri>  
 } +}0/ %5 =1  
 else D[ (A`!)  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); +&hd3  
  if(hHook!=NULL) bIahjxd:  
   nHookCount++; g)#neEA J  
  return (hHook!=NULL); q~:k[@`.  
} {kgV3 [%>  
BOOL UnInit() 2_lb +@[W  
{ ey>V^Fj  
 if(nHookCount>1){ r5N.Qt8  
  nHookCount--; zHvG3Ed@  
  return TRUE; hbv>Jjd  
 } s@vHU4  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 3]1uDgfr  
 if(unhooked==TRUE){ W-+~r  
  nHookCount=0;  \>*B  
  hHook=NULL; bjEm=4FI;  
 } &]Q\@;]Aq  
 return unhooked; StJ&YYdD  
} YYUWBnf30G  
V8.o}BWY  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8(c,b  
{ Mm+kG'Z!S  
 BOOL bAdded=FALSE; 8P= z"y  
 for(int index=0;index<MAX_KEY;index++){ N v,Yikf  
  if(hCallWnd[index]==0){ qkN{l88  
   hCallWnd[index]=hWnd; t LZ4<wc  
   HotKey[index]=cKey;  &(Ot(.  
   HotKeyMask[index]=cMask; u*J,3o} <  
   bAdded=TRUE; 1FiFP5  
   KeyCount++; [vs5e3B)  
   break; `Al( AT(p  
  } 3jB5F0^r1  
 } k-&fPEjG  
 return bAdded; h}o7/p  
} #4e Taik  
y QxzFy  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) fQ[ GN}k  
{ 5&\%  
 BOOL bRemoved=FALSE; *u4h+P  
 for(int index=0;index<MAX_KEY;index++){ _Hn-bp[?>  
  if(hCallWnd[index]==hWnd){ ?|t9@r  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ n2$(MDdL`  
    hCallWnd[index]=NULL; Ht Z3n"2  
    HotKey[index]=0; G 'sEbw'[  
    HotKeyMask[index]=0; s<t*g]0`/  
    bRemoved=TRUE; -~-BQ!!(  
    KeyCount--; ah\yw  
    break; A[@xTq s{{  
   } ir%?J&C+t  
  } tGcp48R-:+  
 } VnB"0 "%w  
 return bRemoved; b]X c5Dp{  
} ,dM}B-  
{ ke}W  
void VerifyWindow() mPy=,xYyC  
{ G92Ya^`  
 for(int i=0;i<MAX_KEY;i++){ ~al4`:rRx1  
  if(hCallWnd!=NULL){ Rh:edQ #  
   if(!IsWindow(hCallWnd)){  <V-D  
    hCallWnd=NULL; Rs0O4.yi;@  
    HotKey=0; V~> x \  
    HotKeyMask=0; WML%yO\.;  
    KeyCount--; [h>RO55e  
   } V]V~q ]  
  } l H@hV  
 } J~3+j6?%  
} 6 ZutU ~HS  
4#oLf1  
BOOL CHookApp::InitInstance() $s*\yam?|  
{ qd=&*?  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); y()7m/  
 hins=AfxGetInstanceHandle(); D)ZGTq`(  
 InitHotkey(); H +O7+=&  
 return CWinApp::InitInstance(); DRC2U%[  
} jW^@lH EU  
]\y:AkxhJ  
int CHookApp::ExitInstance() b'Scoa7@'  
{ cg-\|H1  
 VerifyWindow(); 9 -\.|5;:  
 UnInit(); [f9U9.fR  
 return CWinApp::ExitInstance(); #@QZ  
} 1Z5:D E<  
[J'O5" T  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file .]_ (>^6  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) FvpI\%#~  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_  0(2r"Hi  
#if _MSC_VER > 1000 SL9]$MmJn  
#pragma once o\oS_f:RD  
#endif // _MSC_VER > 1000 ^{3,ok*Nf  
9U[ A   
class CCaptureDlg : public CDialog Lc<v4Bp  
{ @pcmVsIp  
 // Construction |2#)lGA  
 public: {G:dhi  
  BOOL bTray; lLq:(zMH  
  BOOL bRegistered; o& g0 1t  
  BOOL RegisterHotkey(); L 1FT h  
  UCHAR cKey; vR X_}`m8#  
  UCHAR cMask; 0=3Av8  
  void DeleteIcon(); /1F5khN  
  void AddIcon(); Oq-O|qJj  
  UINT nCount; 7q2G/_  
  void SaveBmp(); =i_ s#v[Y  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 3dlL?+Y#  
  // Dialog Data }IM*Vsk  
  //{{AFX_DATA(CCaptureDlg)  F'!pM(+  
  enum { IDD = IDD_CAPTURE_DIALOG }; ]m _<lRye  
  CComboBox m_Key; -RisZ-n*  
  BOOL m_bControl; r2WW}W  
  BOOL m_bAlt; r &<sSE;5  
  BOOL m_bShift; W+v7OSd92  
  CString m_Path; VM 3~W  
  CString m_Number; s  bl> i  
  //}}AFX_DATA O_yk<  
  // ClassWizard generated virtual function overrides q97Z .o  
  //{{AFX_VIRTUAL(CCaptureDlg) llbf(!  
 public: F|,_k%QP  
  virtual BOOL PreTranslateMessage(MSG* pMsg); v1s.j2T  
 protected: ^EK]z8;|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (%&HufT  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); YueYa#7z  
  //}}AFX_VIRTUAL ^Jv$Wx  
  // Implementation p ~/  
 protected: ;7jszs.6%  
  HICON m_hIcon; }Zs y&K  
  // Generated message map functions '<}N`PS#N  
  //{{AFX_MSG(CCaptureDlg) x4$#x70?  
  virtual BOOL OnInitDialog(); Y[=X b  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); `QpkD8  
  afx_msg void OnPaint(); F/91Es  
  afx_msg HCURSOR OnQueryDragIcon(); l[Hgh,  
  virtual void OnCancel(); `eD70h`XK  
  afx_msg void OnAbout(); T d E.e(  
  afx_msg void OnBrowse(); g j(|#n5C  
  afx_msg void OnChange(); h!k[]bt5  
 //}}AFX_MSG tZW2TUM]  
 DECLARE_MESSAGE_MAP() f6\`eLGi1  
}; cym<uh-Wg^  
#endif Bu[sSoA  
}XJA#@  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file M0+xl+c+  
#include "stdafx.h" `x{*P.]N!<  
#include "Capture.h" |ia#Elavo  
#include "CaptureDlg.h" ] LcCom:]  
#include <windowsx.h>  `7v"(  
#pragma comment(lib,"hook.lib") ""0 cw  
#ifdef _DEBUG `\}Ck1o  
#define new DEBUG_NEW JDp"!x{O  
#undef THIS_FILE zEHX:-f8  
static char THIS_FILE[] = __FILE__; <'{*6f@n  
#endif 6ol*$Q"z  
#define IDM_SHELL WM_USER+1 Bri yy  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Owe"x2D\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); RM\A$.5  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; K{]9Yo  
class CAboutDlg : public CDialog zWN<"[agc  
{ [&Yrnkgr  
 public: IE^xk@  
  CAboutDlg(); 'AU:[eyUV  
  // Dialog Data 8>\tD  
  //{{AFX_DATA(CAboutDlg) J@ CKgE  
  enum { IDD = IDD_ABOUTBOX }; F.]D\"0`  
  //}}AFX_DATA M<nKk#!+h  
  // ClassWizard generated virtual function overrides ';>]7oT`  
  //{{AFX_VIRTUAL(CAboutDlg) h83W;s  
 protected: ]~YY#I":  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support , QB]y|:  
  //}}AFX_VIRTUAL Fv| )[>z0  
  // Implementation 2LO8SJ#  
 protected: I34|<3t$  
  //{{AFX_MSG(CAboutDlg) t<F*ODn  
  //}}AFX_MSG 8)Z)pCN  
  DECLARE_MESSAGE_MAP() -~Ll;}nZC  
}; ]AB<OjF1c|  
hDn?R}^l{  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) < 5 ?  
{ G\X}gqe(OJ  
 //{{AFX_DATA_INIT(CAboutDlg) 4p}?QR>tZ  
 //}}AFX_DATA_INIT 0*=[1tdWY  
} yi29+T7j4S  
UrMEL; @g  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) uZ1b_e0SGu  
{ |c<h& p  
 CDialog::DoDataExchange(pDX); bR\Oyd~e  
 //{{AFX_DATA_MAP(CAboutDlg) j aU.hASj  
 //}}AFX_DATA_MAP rEoMj)~\4&  
} bgk+PQ#S-  
rpB0?h!$  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) j[ fE^&  
 //{{AFX_MSG_MAP(CAboutDlg) Q\QSnMM&]  
 // No message handlers S6<z2-y  
 //}}AFX_MSG_MAP (C3:_cM5  
END_MESSAGE_MAP() /h(bMbZ  
NFs Cq_f  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) {^z>uRZ3  
: CDialog(CCaptureDlg::IDD, pParent) |E}-j;(  
{ P]~apMi:  
 //{{AFX_DATA_INIT(CCaptureDlg) `X8wnD  
  m_bControl = FALSE; /WxCsQn  
  m_bAlt = FALSE; "mtEjK5  
  m_bShift = FALSE; rk E;OU  
  m_Path = _T("c:\\"); iAl.(j  
  m_Number = _T("0 picture captured."); j;7:aM"BQW  
  nCount=0; N6>ert1  
  bRegistered=FALSE; H(QbH)S$6  
  bTray=FALSE; ^oLMgz  
 //}}AFX_DATA_INIT -4;$NiB?  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 vWs#4JoG  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;%ng])w=;  
} 6?BV J  
~LfFLC  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) @'~7O4WH  
{ +{r~-Rn3  
 CDialog::DoDataExchange(pDX); \ cr)O^&  
 //{{AFX_DATA_MAP(CCaptureDlg) (i1q".  
  DDX_Control(pDX, IDC_KEY, m_Key); ,6EFJVu \  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); @'> Ul!.]  
  DDX_Check(pDX, IDC_ALT, m_bAlt); )8JfBzR  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); .rcXxV@f  
  DDX_Text(pDX, IDC_PATH, m_Path); 59l9^<{A  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Clo}kdkd_  
 //}}AFX_DATA_MAP H#+2l?D:"  
} -U BH,U  
/S #Z.T~~  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Gf->N `N  
//{{AFX_MSG_MAP(CCaptureDlg) 8 U<$u,WS  
 ON_WM_SYSCOMMAND() \dHdL\f  
 ON_WM_PAINT() sJ>JHv  
 ON_WM_QUERYDRAGICON() .gJv})Vi  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Xt%y>'.  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) !^x;4@Ejm  
 ON_BN_CLICKED(ID_CHANGE, OnChange) d(_;@%p1X  
//}}AFX_MSG_MAP j9 d^8)O,  
END_MESSAGE_MAP() 8o  SL3  
c!ul9Cw  
BOOL CCaptureDlg::OnInitDialog() 1G}\IK1+  
{ x,fX mgE  
 CDialog::OnInitDialog(); @TraEBJGL  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); j9r%OZw{  
 ASSERT(IDM_ABOUTBOX < 0xF000); Q>yO,H|  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 2)\g IMt%  
 if (pSysMenu != NULL) u$Wv*;TT%  
 { sLOkLz"x  
  CString strAboutMenu; ?Z2_y-  
  strAboutMenu.LoadString(IDS_ABOUTBOX); cl{kCSZo.z  
  if (!strAboutMenu.IsEmpty()) n_/;j$h  
  { f5`q9w_c  
   pSysMenu->AppendMenu(MF_SEPARATOR); .P(A x:g  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ($X2SIZh  
  } m:W+s4!E  
 } r]B`\XWz  
 SetIcon(m_hIcon, TRUE); // Set big icon G@4n]c_  
 SetIcon(m_hIcon, FALSE); // Set small icon U:fGIEz{ZY  
 m_Key.SetCurSel(0); vPSY 1NC5  
 RegisterHotkey(); WX&0;Kr  
 CMenu* pMenu=GetSystemMenu(FALSE); Ru~;awV?  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 'h#>@v> }  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); cR6Rb[9 N  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); qir8RPW  
 return TRUE; // return TRUE unless you set the focus to a control VfT@;B6ALF  
} 1 uJpn  
p_EWpSOt7  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 8=,?B h".  
{ u|sdQ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) }Ryrd!3bY  
 { ayZWt| iHA  
  CAboutDlg dlgAbout; &`2$,zX#  
  dlgAbout.DoModal(); LJwy,-  
 } _X~xfmU  
 else }Sh3AH/  
 { bcUa'ZfN<  
  CDialog::OnSysCommand(nID, lParam); ?hOv Y)  
 } `s\E"QeZN  
} @^t1SPp  
 bE%*ZB  
void CCaptureDlg::OnPaint() 1UN$eb7  
{ +(m*??TAV  
 if (IsIconic()) *Xk gwJq  
 { Dq<!wtFG[  
  CPaintDC dc(this); // device context for painting V`_)H  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); k&pV`.Imi  
  // Center icon in client rectangle #^9a[ZLj0  
  int cxIcon = GetSystemMetrics(SM_CXICON); tKCX0UZ'  
  int cyIcon = GetSystemMetrics(SM_CYICON); ,xg(F0q  
  CRect rect; ;0nL1R]w(  
  GetClientRect(&rect); {q/D,Rh8  
  int x = (rect.Width() - cxIcon + 1) / 2; 0[92&:c,  
  int y = (rect.Height() - cyIcon + 1) / 2; ,D93A  
  // Draw the icon +-PFISa<r  
  dc.DrawIcon(x, y, m_hIcon); O6b.oS '-  
 } q\d/-K  
 else M!O &\2Q  
 { }UWi[UgA  
  CDialog::OnPaint(); `C)|}qcC  
 } Og:aflS  
} r}|a*dh'R  
5iZ;7 ?(  
HCURSOR CCaptureDlg::OnQueryDragIcon() ]DK.4\^  
{ PX5U)  
 return (HCURSOR) m_hIcon; |D~#9  
} [g@ .dr3t  
!U~S7h}  
void CCaptureDlg::OnCancel() ADT8A."R[  
{ ) B[S4K2  
 if(bTray) Jzj>=jWX@  
  DeleteIcon(); c{\x< AwO  
  CDialog::OnCancel(); ;*>':-4  
} 7D=gAMPvJ  
im@c||  
void CCaptureDlg::OnAbout() S<Uv/pn  
{ xX\A& 9m  
 CAboutDlg dlg; SVi{B*  
 dlg.DoModal(); DC,]FmWs!+  
} uE&2M>2  
Ta)6ly7'  
void CCaptureDlg::OnBrowse() PHg(O:3WG  
{ o(Q='kK  
 CString str; */ok]kX'  
 BROWSEINFO bi; 43/!pW  
 char name[MAX_PATH]; BF(Kaf;<t.  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); SAUG+{Uq  
 bi.hwndOwner=GetSafeHwnd(); dk@iAL*v  
 bi.pszDisplayName=name; Rqun}v}  
 bi.lpszTitle="Select folder"; #QKgY7  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; [OwrIL  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); f4+}k GJN  
 if(idl==NULL) zF_aJ+i:~  
  return; 86ml.VOR  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); )"&\S6*!  
 str.ReleaseBuffer(); .!Q?TSQ+{!  
 m_Path=str; 4/QQX;w  
 if(str.GetAt(str.GetLength()-1)!='\\') )B5(V5-!|  
  m_Path+="\\"; fR,7l9<%Zp  
 UpdateData(FALSE); xi!R[xr1  
} cQ`+ A|q  
\:_!!   
void CCaptureDlg::SaveBmp() 5dEek7wnf  
{ <'92\O  
 CDC dc; K&%YTA  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 9 p`|~^X  
 CBitmap bm; r]O8|#P,Z$  
 int Width=GetSystemMetrics(SM_CXSCREEN); )Ga 3Ji}'  
 int Height=GetSystemMetrics(SM_CYSCREEN); X{;3gN  
 bm.CreateCompatibleBitmap(&dc,Width,Height); (0QYX[(r~o  
 CDC tdc;  nCSXvd/  
 tdc.CreateCompatibleDC(&dc); R\>=}7  
 CBitmap*pOld=tdc.SelectObject(&bm); .6y(ox|LL  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); x#TWZ;  
 tdc.SelectObject(pOld); m| k:wuzqK  
 BITMAP btm; :t6.J  
 bm.GetBitmap(&btm); /r mm@  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; =f-.aq(G/  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Xd@x(T~'X  
 BITMAPINFOHEADER bih; ?G$X 4KY6`  
 bih.biBitCount=btm.bmBitsPixel; tCbn B  
 bih.biClrImportant=0; I cz) Qtg|  
 bih.biClrUsed=0; f*GdHUZ*  
 bih.biCompression=0; S0-/9h  
 bih.biHeight=btm.bmHeight; ^]1M8R,  
 bih.biPlanes=1; `|g*T~; kC  
 bih.biSize=sizeof(BITMAPINFOHEADER); O-YB +~"3Z  
 bih.biSizeImage=size; r Q$Jk[Y  
 bih.biWidth=btm.bmWidth; zoO9N oUHW  
 bih.biXPelsPerMeter=0; O^I%Xk  
 bih.biYPelsPerMeter=0; 2ZZF hj  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); p/%B>Y >  
 static int filecount=0; CsW*E,|xyP  
 CString name; 8CN 0Q&|  
 name.Format("pict%04d.bmp",filecount++); 7EukrE<b'  
 name=m_Path+name; 4@ =l'Fw  
 BITMAPFILEHEADER bfh; mp+lN:  
 bfh.bfReserved1=bfh.bfReserved2=0; 62z"cFN  
 bfh.bfType=((WORD)('M'<< 8)|'B'); h]#bPb  
 bfh.bfSize=54+size; pxO ?:B  
 bfh.bfOffBits=54; sXm,y$ \m  
 CFile bf; DeL7sU  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ E/N*n!sV  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); z\Y-8a.]  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); F!qt#Sw!\  
  bf.WriteHuge(lpData,size); >aV Q  
  bf.Close(); ^q ?xi5 w  
  nCount++; (vqI@fB';u  
 } ~pj/_@S@x  
 GlobalFreePtr(lpData); lhLE)B2a2  
 if(nCount==1) 4?F7%^vr  
  m_Number.Format("%d picture captured.",nCount); y |E {]  
 else fxL0"Ry  
  m_Number.Format("%d pictures captured.",nCount); ~LuR)T=%es  
  UpdateData(FALSE); KgMW  
} Xv1mjHZCC  
qOd*9AS'|M  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ,c_NXC^X?  
{ Uq}-<q  
 if(pMsg -> message == WM_KEYDOWN) ;~5w`F)  
 { }^Kye23  
  if(pMsg -> wParam == VK_ESCAPE) |UZhMF4/-L  
   return TRUE; Kv26rY8Q  
  if(pMsg -> wParam == VK_RETURN) nkvkHh  
   return TRUE; rlIDym9nY~  
 } %knPeo&  
 return CDialog::PreTranslateMessage(pMsg); fb||q-E  
} %T:7I[f  
}v?_.MtS  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) G~;hD-D~.  
{ L?gak@E  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ *K1GX  
  SaveBmp(); G>fJ)A  
  return FALSE; yxU??#v|g  
} -U/m  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ".R5K ?  
 CMenu pop; #aV2+`d  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); s=xJcLA  
 CMenu*pMenu=pop.GetSubMenu(0); 4 9zOhG |  
 pMenu->SetDefaultItem(ID_EXITICON); {_i.IPp~  
 CPoint pt; y $K#M  
 GetCursorPos(&pt); ;+/[<bvd"  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ,/P)c*at5  
 if(id==ID_EXITICON) ~J:"sUR  
  DeleteIcon(); R^=)Ucj  
 else if(id==ID_EXIT) C3 m#v[+  
  OnCancel(); 8+7=yN(  
 return FALSE; fm%1vM$[J  
} VD*xhuy$k  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ?NL>xMA  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ix=H=U]Q{  
 AddIcon(); (YJ]}J^  
 return res; ORo +=2  
} ADa'(#+6  
=_/,C  
void CCaptureDlg::AddIcon() ? <.U,  
{ /:j9 #kj  
 NOTIFYICONDATA data; 8v)PDO~D}A  
 data.cbSize=sizeof(NOTIFYICONDATA); uJP9J  U  
 CString tip; `RG_FS"v  
 tip.LoadString(IDS_ICONTIP); &E>zvRBQ  
 data.hIcon=GetIcon(0); 3g#fX{e_5!  
 data.hWnd=GetSafeHwnd(); D|1pBn.b]'  
 strcpy(data.szTip,tip); 3)J0f+M>dv  
 data.uCallbackMessage=IDM_SHELL; \dL# PI3  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; .RNr^*AQ  
 data.uID=98; *&vySyt  
 Shell_NotifyIcon(NIM_ADD,&data); ul',!js?  
 ShowWindow(SW_HIDE); 1JU1XQi  
 bTray=TRUE; u,6 'yB'u  
} /{~cUB,Um  
S}rW=hO  
void CCaptureDlg::DeleteIcon() -O ro$=%  
{ LK^t ](F  
 NOTIFYICONDATA data; x>@+lV'O  
 data.cbSize=sizeof(NOTIFYICONDATA); 2_4m}T3   
 data.hWnd=GetSafeHwnd(); &@dW d  
 data.uID=98; &x(^=sTHI  
 Shell_NotifyIcon(NIM_DELETE,&data); ]qJ6#sAw75  
 ShowWindow(SW_SHOW); ]c8O"4n n  
 SetForegroundWindow(); Ti@X< C  
 ShowWindow(SW_SHOWNORMAL); {bUd"Tu  
 bTray=FALSE; [We(0wF[`  
} :W/,V^x}  
*WQ}ucE^#  
void CCaptureDlg::OnChange() :z EhPx;B7  
{ `2Buf8|a,  
 RegisterHotkey(); I\0mmdi73  
} Us ]Uy|j  
cXO_g!&2A  
BOOL CCaptureDlg::RegisterHotkey() c !ybz{L  
{ "/)}Cc,L  
 UpdateData(); z.9 #AN=&[  
 UCHAR mask=0; AID}NQ Qj_  
 UCHAR key=0; ^%v<I"<Uq5  
 if(m_bControl) xpf\S10e  
  mask|=4; 3eV(2  
 if(m_bAlt) 43mV~Oj  
  mask|=2; J jCzCA:K_  
 if(m_bShift) uxq!kF'Ls  
  mask|=1; 'CDRb3w}B  
  key=Key_Table[m_Key.GetCurSel()]; [1Dg_>lz  
 if(bRegistered){ $?OuY*ZeY9  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); a/.O, &3  
  bRegistered=FALSE; eTc0u;{V  
 } )p MZ5|+X  
 cMask=mask; VK+#!!Ha  
 cKey=key; z^/aJ@gQ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >Hr0ScmN@"  
 return bRegistered; -4p^wNR  
} 1u\fLAXn  
.&ynS  
  四、小结 h-1eDxK6  
sa~.qmqu  
  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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