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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: -Q6Vz=ku  
  c'D NO~H  
  一、实现方法 = N^Ec[u(l  
4rLc] >  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: ?c<uN~fC=  
'#a;n  
#pragma data_seg("shareddata") u'T?e+=  
HHOOK hHook =NULL; //钩子句柄 8ZCR9%  
UINT nHookCount =0; //挂接的程序数目 <+UJgB A-  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 H8kB.D[7Q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 pQi|PQq  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey .I0M'L~!/L  
static int KeyCount =0; mu2|%$C;$  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 2cjbb kq  
#pragma data_seg() 26}fB  
y~'%PUN  
  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|V[-H  
D63?f\  
  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: \M;cF "e-S  
qpjiQ,\:b  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR \]0#jI/:  
cKey,UCHAR cMask) C;?<WtH  
{ z.|[g$F  
 BOOL bAdded=FALSE; 5+2qx)FZ  
 for(int index=0;index<MAX_KEY;index++){ + 2w<V0V_  
  if(hCallWnd[index]==0){ m.FN ttkM  
   hCallWnd[index]=hWnd; ~ike&k{  
   HotKey[index]=cKey; ftz-l&5  
   HotKeyMask[index]=cMask; Lvrflx*Q  
   bAdded=TRUE; A ^t _"J  
   KeyCount++; @~}~;}0x  
   break; RivhEc1h%  
  } U|<>xe*|%  
 } 7x]q>Y8T  
 return bAdded; 55ft ,a  
} A2!pbeG  
//删除热键 {55f{5y3 c  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) H<tU[U=G  
{ < lUpvr  
 BOOL bRemoved=FALSE; 6tGF  
 for(int index=0;index<MAX_KEY;index++){ yg6o#;  
  if(hCallWnd[index]==hWnd){ xiV!\Z}  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2UIZ<#|D>s  
    hCallWnd[index]=NULL; fWf't2H&  
    HotKey[index]=0; \]g51U!'  
    HotKeyMask[index]=0; "ZL_  
    bRemoved=TRUE; p,tkVedR  
    KeyCount--; \E'z+0  
    break; 9 e|[9  
   } ] &SmeTe  
  } ?Yx2q_KZk  
 } !DUOi4I  
 return bRemoved; N_G84wxx  
} a)L|kux;l  
F2{SC?U  
VUOe7c=  
  DLL中的钩子函数如下: R?y_tho4A  
`dWnu3r;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ,4=mlte"  
{ $wyPGok  
 BOOL bProcessed=FALSE; QX42^]({;c  
 if(HC_ACTION==nCode) 2.^CIJc  
 { CfVL'  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 &?TXsxf1Zh  
   switch(wParam) do9~#F  
   {  "T h;YJu  
    case VK_MENU: m.<or?l'y>  
     MaskBits&=~ALTBIT; j{johV+`8  
     break; %<r}V<OeR  
    case VK_CONTROL: <m0=bm{j  
     MaskBits&=~CTRLBIT; E@6gTx*  
     break; a|(|!=  
    case VK_SHIFT: 5A^8?,F@  
     MaskBits&=~SHIFTBIT; )3O#T$h  
     break; 1]Cd fj6@  
    default: //judge the key and send message z "z  
     break; Mf !S'\  
   } f@q.kD21  
   for(int index=0;index<MAX_KEY;index++){ v2a(yH  
    if(hCallWnd[index]==NULL) +_25E.>ml  
     continue; KdD~;Ap$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 138v{Z  
    { I_e7rE0 `  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); s IBP$9  
     bProcessed=TRUE; n]7rHV}G  
    } DMTc{  
   } q#1G4l.  
  } | O9b  
  else if((lParam&0xc000ffff)==1){ //有键按下  ^6b5}{>  
   switch(wParam) G$luGxl[  
   { ]o8yZ x  
    case VK_MENU: fqBz"l>5A  
     MaskBits|=ALTBIT; (XlvPcTi  
     break; /q8B | (U  
    case VK_CONTROL: ?NvE9+n  
     MaskBits|=CTRLBIT; 0:-z+`RHE  
     break; ';}:*nZ//_  
    case VK_SHIFT: 'n^?DPvD  
     MaskBits|=SHIFTBIT; j&U7xv  
     break; Vk2%yw>  
    default: //judge the key and send message Efoy]6P\  
     break; TU;AO%5  
   } _yF@k~ h  
   for(int index=0;index<MAX_KEY;index++){ 9I`0`o"A  
    if(hCallWnd[index]==NULL) `gF`Sgz  
     continue; 4E_u.tJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }gFa9M<  
    { b4EUr SL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Y+kuj],h  
     bProcessed=TRUE; {U@"]{3Qx  
    } ,\i,2<hz.  
   } K9Onjs% U  
  } SL`; `//  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 }_-tJ.  
   for(int index=0;index<MAX_KEY;index++){  !VXy67  
    if(hCallWnd[index]==NULL) +Z-{6C  
     continue; X-Ev>3H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :fnJp9c  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %Pl |3i  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 bKsEXS  
   } `Y+ R9bd  
  } e@]m@  
 } &y7=tEV  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); p!)PbSw#  
} 2pv by`P4  
:;TF_S v  
  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: /|#2ehE  
U#- 5",X|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); X\w["! B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); cvf?ID84  
j?T>S]xOX  
  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: BHS@whj  
vl6|i)D  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @P>>:002/  
{ 8G2QI4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) B5h)F> &G  
 { `sy_'`i>X  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 8zcS h/  
  SaveBmp(); f`K#=_Kq7  
  return FALSE; `:R9M+ OX  
 } ,_/\pX0  
 …… //其它处理及默认处理 O2yD{i#l*#  
} wDSwcNS  
v-^<,|vm2f  
GMkni'pV  
  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。 8|$g"? CU  
9~2iA,xs  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 @HnahD  
osmCwM4O  
  二、编程步骤 '66nqJb*  
QFN9j  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; M?;YpaSe+  
90,UhNz9D  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ;49sou  
m6H+4@Z-;(  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; @MoCEtt  
b$pCp`/MT  
  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; /J Y6S  
1}SON4U  
  5、 添加代码,编译运行程序。 k_Sm ep  
Os]. IL$  
三、程序代码 44w "U%+  
;% i-:<ac  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 0LP0q9S:9  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) EP<{3f y  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ?B)e8i<[f  
#if _MSC_VER > 1000 )7-mALyW  
#pragma once QNv5CQ&  
#endif // _MSC_VER > 1000 PI9aKNt  
#ifndef __AFXWIN_H__ \d:Uq5d)0  
#error include 'stdafx.h' before including this file for PCH x_/l,4_  
#endif BeD>y@ it  
#include "resource.h" // main symbols L_+ Fin  
class CHookApp : public CWinApp nB[B FVkU  
{ 0S }\ML  
 public: 4PR&67|AH_  
  CHookApp(); h/y0Q~|/d  
  // Overrides {w,<igh  
  // ClassWizard generated virtual function overrides 7|bBC+;(  
  //{{AFX_VIRTUAL(CHookApp) YguW2R=6]  
 public: FPZ@6  
  virtual BOOL InitInstance(); x%T^:R  
  virtual int ExitInstance(); >HzTaXCR[  
  //}}AFX_VIRTUAL 3j[<nBsn.  
  //{{AFX_MSG(CHookApp) /qq*"R  
  // NOTE - the ClassWizard will add and remove member functions here. Y t_t>  
  // DO NOT EDIT what you see in these blocks of generated code ! KG96;l@'(  
  //}}AFX_MSG M\Wg|gpy  
  DECLARE_MESSAGE_MAP() rTOex]@N  
}; Zs;c0T ">  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 7TU77  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9"/=D9o9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); HCYy9  
BOOL InitHotkey(); bP|-GCKM8  
BOOL UnInit(); \<y|[  
#endif -]YsiE?r  
pe).  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. _j{)%%?r  
#include "stdafx.h" 1Mx2%  
#include "hook.h" . S;o#Zw*R  
#include <windowsx.h> t:,lz8Y~  
#ifdef _DEBUG C.H(aX)7  
#define new DEBUG_NEW *+2BZ ZwT  
#undef THIS_FILE W'E3_dj+  
static char THIS_FILE[] = __FILE__; BvHI}=  
#endif -- IewW  
#define MAX_KEY 100 lQt,(@7]  
#define CTRLBIT 0x04 !:uh? RW  
#define ALTBIT 0x02 bGwj` lue  
#define SHIFTBIT 0x01 B4c;/W-  
#pragma data_seg("shareddata") l Dwq[ I]w  
HHOOK hHook =NULL; f{\[+>  
UINT nHookCount =0; 8{7'w|/;.{  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ]/%CTD(O  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT UIZ9" Da  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey .%\||1F<  
static int KeyCount =0; RaymSh  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift '^ O}`   
#pragma data_seg() j.V7`x  
HINSTANCE hins; CHL5@gg@>y  
void VerifyWindow(); eSW}H_3  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 3.=o}!  
//{{AFX_MSG_MAP(CHookApp) b"w2 2%  
// NOTE - the ClassWizard will add and remove mapping macros here. B < HD  
// DO NOT EDIT what you see in these blocks of generated code! "CFU$~  
//}}AFX_MSG_MAP /R( .7N  
END_MESSAGE_MAP() \ 9sJ`,T?  
z~1S/,Ca  
CHookApp::CHookApp() 1pN8,[hyR7  
{ {t:*Xu  
 // TODO: add construction code here, MQy,[y7I  
 // Place all significant initialization in InitInstance EIg:@o&Jj  
} k^s7s{  
& ##JZ  
CHookApp theApp; THy   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ,W_".aguX  
{ nA=E|$1  
 BOOL bProcessed=FALSE; v|jwz.jM  
 if(HC_ACTION==nCode) 9om}j  
 { k4^!"~<+0  
  if((lParam&0xc0000000)==0xc0000000){// Key up uw`J5TND  
   switch(wParam) 1vq c8lC  
   { w'mn O'%  
    case VK_MENU: 78]( ZYJV  
     MaskBits&=~ALTBIT; ' (3|hh)Tl  
     break; cz$*6P<9J  
    case VK_CONTROL: 1=~##/at  
     MaskBits&=~CTRLBIT; 0Yr-Q;O<f  
     break; OPv~1h<[  
    case VK_SHIFT: e4.G9(  
     MaskBits&=~SHIFTBIT; :<1PCX2  
     break; =RlAOgJ  
    default: //judge the key and send message gA2]kZg  
     break; )Oj{x0{\Q  
   } SK,UW6h  
   for(int index=0;index<MAX_KEY;index++){ ,twm)%caU  
    if(hCallWnd[index]==NULL) G49`a*Jn  
     continue; !4$o*{9Lx:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "T>;wyGW  
    { }\W^$e-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 0F &(}`V  
     bProcessed=TRUE; `2HNQiK'@  
    } <*ME&c gh4  
   } id1gK(F8H  
  } 'puiahA  
  else if((lParam&0xc000ffff)==1){ //Key down .bRDz:?j  
   switch(wParam) bHz H0v]:  
   { cNl$ vP83z  
    case VK_MENU: -e*(+  
     MaskBits|=ALTBIT; - KaU@t  
     break; cA!o xti  
    case VK_CONTROL:  '^,|8A2  
     MaskBits|=CTRLBIT; uC 2{ Mmy  
     break; 0qN+W&H  
    case VK_SHIFT: o& ?:pE  
     MaskBits|=SHIFTBIT; l<s6Uu"  
     break; <VT|R~  
    default: //judge the key and send message okbW.  ~  
     break; [R/'hH5  
   } !XF:.|  
   for(int index=0;index<MAX_KEY;index++) g'.(te |  
   { -&np/tEu&  
    if(hCallWnd[index]==NULL) (.g?|c  
     continue; OX{2@+f#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^4a|gc  
    { h)X"<a++N  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); X`k#/~+0  
     bProcessed=TRUE; OkQtM nq  
    } oUN;u*  
   } 1@^*tffL:  
  } kAAD&t;w  
  if(!bProcessed){ kY~o3p<  
   for(int index=0;index<MAX_KEY;index++){ 6CNxb  
    if(hCallWnd[index]==NULL) Mqmy*m[U  
     continue; V_=7q=9mV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) p8E6_%Rw  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); '77Gg  
   } T K Ec ^  
  } xG,L*3c{o  
 } OH`|aqN  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); zj#8@gbh+  
} c7 O$< F  
5 r&n  
BOOL InitHotkey() a,?u 2  
{ \7 *"M y*  
 if(hHook!=NULL){ qW9~S0sl  
  nHookCount++; B>e},!  
  return TRUE; ?&@a{-  
 } '2S?4Z  
 else =XZd_v  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ?.69nN  
  if(hHook!=NULL) c(lG_"q6  
   nHookCount++; vC-5_pl  
  return (hHook!=NULL); %d#j%=  
} <;zcz[~  
BOOL UnInit() dZ,~yV  
{ tP|ox]  
 if(nHookCount>1){ - D^v:aC  
  nHookCount--; %j;mDR9 5  
  return TRUE; K,f- w2!  
 } VNxhv!w  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Y i`wj^  
 if(unhooked==TRUE){ aHSl_[  
  nHookCount=0; b|u0a6  
  hHook=NULL; q,.@<sW  
 } Y| F~w~Cb  
 return unhooked; Y86 mg7[U/  
} /"7_75 t  
G`FY[^:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4So ,m0v  
{ je5GZFQw  
 BOOL bAdded=FALSE; ^:^8M4:  
 for(int index=0;index<MAX_KEY;index++){ :<R"Kk@  
  if(hCallWnd[index]==0){ ]+@I] \S4  
   hCallWnd[index]=hWnd; $/$ 5{<  
   HotKey[index]=cKey; ^<+V[ =X  
   HotKeyMask[index]=cMask; YiTVy/  
   bAdded=TRUE; -X,[NI3  
   KeyCount++; L~&r.81  
   break; ECLQqjB  
  } JnXVI!+JDL  
 } "Rr650w[  
 return bAdded; 'E kuCL  
} >1NE6T  
1p COLC%1  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "uG@gV  
{ qnTW?c9Z5  
 BOOL bRemoved=FALSE; `(lD]o{,s  
 for(int index=0;index<MAX_KEY;index++){ fz W!-  
  if(hCallWnd[index]==hWnd){ 9wpV} .(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ U$wD'v3pw  
    hCallWnd[index]=NULL; t}f,j^`e  
    HotKey[index]=0; ~cb7]^#u1l  
    HotKeyMask[index]=0; "\l#q$1h  
    bRemoved=TRUE; P] qL&_  
    KeyCount--; \CZD.2p#&  
    break; Yjh02wo  
   } 'qiDh[ATa  
  } ;.&k zzvJ  
 } HkdBPMs79  
 return bRemoved; ko`.nSZ-k  
} 'XW9+jj)/  
e>!=)6[*  
void VerifyWindow() p [7?0 (  
{ =~ [RG  
 for(int i=0;i<MAX_KEY;i++){ n>?eTlO3  
  if(hCallWnd!=NULL){ j5bp)U  
   if(!IsWindow(hCallWnd)){ tY!GJusd  
    hCallWnd=NULL; bTW# f$q:4  
    HotKey=0; RKO}  W#?  
    HotKeyMask=0; _REAzxe S  
    KeyCount--; q?bKh*48  
   } tIL ]JB  
  } th`pf   
 } }BJR/r  
} D;+sStZK3  
L<[%tvV  
BOOL CHookApp::InitInstance() y5`$Aa4~  
{ 9; `E,w  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); <@J0 770  
 hins=AfxGetInstanceHandle(); HCZVvsG  
 InitHotkey(); G)3Q|Vc  
 return CWinApp::InitInstance(); P|QM0GI  
} 4~Jg\@  
+ vO; J  
int CHookApp::ExitInstance() /DoSU>%hK  
{ 9 1ndr@*|  
 VerifyWindow(); c^x5 E`{  
 UnInit(); @"O|[%7e  
 return CWinApp::ExitInstance(); gfly?)VnF  
} c, FZ{O@  
0artR~*}  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file l3HfaCP6:  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) pRGag~h|E  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ nIf~ds&TT  
#if _MSC_VER > 1000 Ln"D .gpq  
#pragma once vMeB2r<  
#endif // _MSC_VER > 1000 Rh#QPYPq  
rIQ%X`Y  
class CCaptureDlg : public CDialog *dPG[ }  
{ QHgkfo  
 // Construction wL~-k  
 public: HJt@m &H|  
  BOOL bTray; yGvBQ2kYb  
  BOOL bRegistered; x|GkXD3  
  BOOL RegisterHotkey(); -xL^UcG0  
  UCHAR cKey; |wGmu&fY  
  UCHAR cMask; EClx+tz;`  
  void DeleteIcon(); \x<i6&.  
  void AddIcon(); T*jQzcm~?  
  UINT nCount; 6 }>CPi#  
  void SaveBmp(); i>%A0.9  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor (DY&{vudF  
  // Dialog Data ]\(Ho  
  //{{AFX_DATA(CCaptureDlg) \IO<V9^L  
  enum { IDD = IDD_CAPTURE_DIALOG }; /|>?!;   
  CComboBox m_Key; 6d/1PGB  
  BOOL m_bControl; IH3Nkpsg  
  BOOL m_bAlt; BD?u|Fd,i:  
  BOOL m_bShift; - `{T?  
  CString m_Path; }j;G`mV2  
  CString m_Number; aI_[h v  
  //}}AFX_DATA "2z&9`VIY  
  // ClassWizard generated virtual function overrides a7n`(}?Y  
  //{{AFX_VIRTUAL(CCaptureDlg) 7[ZoUWx  
 public: vE&K!k`  
  virtual BOOL PreTranslateMessage(MSG* pMsg); t_w2J=2  
 protected: dQ=L<{(  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !24PJ\~I  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); /Csk"IfuO  
  //}}AFX_VIRTUAL S9%ZeM +  
  // Implementation @K1'Q!S *  
 protected: PC3?eS}  
  HICON m_hIcon; 6 l7iX]  
  // Generated message map functions ]\ t20R{z  
  //{{AFX_MSG(CCaptureDlg) *=X61`0  
  virtual BOOL OnInitDialog(); 1'f&  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam);  xq&r|el  
  afx_msg void OnPaint(); 1 RVs!;  
  afx_msg HCURSOR OnQueryDragIcon(); d'@i8N["{  
  virtual void OnCancel(); 00/ RBs 5  
  afx_msg void OnAbout(); Q$b4\n?44  
  afx_msg void OnBrowse(); vOo-jUKs  
  afx_msg void OnChange(); NK6 ~qWsu  
 //}}AFX_MSG zx7A}rs3oX  
 DECLARE_MESSAGE_MAP() ~- eB  
}; u4|) A4n  
#endif jM: |%o  
L [&|<<c  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file \1<8'at  
#include "stdafx.h" /<1zzeHRSD  
#include "Capture.h" +h@ZnFp3  
#include "CaptureDlg.h" oc;4;A-;`c  
#include <windowsx.h> DO6 pv  
#pragma comment(lib,"hook.lib") 17#t7Yk  
#ifdef _DEBUG V I]~uTV  
#define new DEBUG_NEW V-dyeb  
#undef THIS_FILE _6-N+FI  
static char THIS_FILE[] = __FILE__; HT7I~]W  
#endif -f["1-A  
#define IDM_SHELL WM_USER+1 )zkr[;j~`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); r-o+NV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @cc}[Uw4B  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; lJdrrR)wg  
class CAboutDlg : public CDialog m= rMx]k  
{ q\xsXM  
 public: v^aI+p6  
  CAboutDlg(); 9XmbHS[0V  
  // Dialog Data pgBIYeY,  
  //{{AFX_DATA(CAboutDlg) YRQ?:a{H  
  enum { IDD = IDD_ABOUTBOX }; %LBf'iA  
  //}}AFX_DATA }kSP p  
  // ClassWizard generated virtual function overrides ndu$N$7+  
  //{{AFX_VIRTUAL(CAboutDlg) b8**M'k  
 protected: %E[ $np>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {t|Q9&  
  //}}AFX_VIRTUAL AjJ/t4<  
  // Implementation Vg}+w Nt5  
 protected: e[6Me[b  
  //{{AFX_MSG(CAboutDlg) Zn:]?%afdO  
  //}}AFX_MSG !X`cNd)0Xo  
  DECLARE_MESSAGE_MAP() mc4|@p*  
}; (_AU)  
5Gm8U"UR  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) jT`u!CwdT  
{ q"Sja!-;|  
 //{{AFX_DATA_INIT(CAboutDlg) +mN8uU~(kx  
 //}}AFX_DATA_INIT NfZC}  
} +xQj-r)-  
R)-~5"}~  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) >0?ph<h1[q  
{ 4kR;K !@k  
 CDialog::DoDataExchange(pDX); Q)\[wYMt  
 //{{AFX_DATA_MAP(CAboutDlg) h{ZK;(u$  
 //}}AFX_DATA_MAP r,q.RWuII  
} !LCy:>i!d  
A4 /gVi|  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) udPLWrPF\  
 //{{AFX_MSG_MAP(CAboutDlg) pm2]  
 // No message handlers f8-~&N/_R  
 //}}AFX_MSG_MAP ,6ae='=d  
END_MESSAGE_MAP() Fb ~h{  
qe/5'dw  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) c3WF!~1r  
: CDialog(CCaptureDlg::IDD, pParent) i!eY"|o  
{ &%tW  
 //{{AFX_DATA_INIT(CCaptureDlg) oJ|m/i)  
  m_bControl = FALSE; G=l:v  
  m_bAlt = FALSE; xl Q]"sm1  
  m_bShift = FALSE; t ?05  
  m_Path = _T("c:\\"); 5"bg 8hL  
  m_Number = _T("0 picture captured."); [AYJ(H/  
  nCount=0; &~'i,v|E  
  bRegistered=FALSE; j Q8 T  
  bTray=FALSE; y5XFJj  
 //}}AFX_DATA_INIT ^4xl4nbx  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 U+aiH U9  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &{q<  
} %vbov}R  
_+Z5qUmQ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) !wC( ]Y  
{ /T 2 v`Li  
 CDialog::DoDataExchange(pDX); ExF6y#Y G<  
 //{{AFX_DATA_MAP(CCaptureDlg) h@J3+u<  
  DDX_Control(pDX, IDC_KEY, m_Key); N*\r i0  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); l;@bs  
  DDX_Check(pDX, IDC_ALT, m_bAlt); kx;7/fH  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Q_dMuoI  
  DDX_Text(pDX, IDC_PATH, m_Path); HkY#i;%N  
  DDX_Text(pDX, IDC_NUMBER, m_Number); "whs?^/  
 //}}AFX_DATA_MAP >h.HW  
} 5g.K yj|  
g ;X K3R  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) GyV uQ51  
//{{AFX_MSG_MAP(CCaptureDlg) g?*D)W U  
 ON_WM_SYSCOMMAND() qRz /$|.  
 ON_WM_PAINT() ( X+2vN  
 ON_WM_QUERYDRAGICON() S;oRE' kk  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ^1<i7u  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) &Lbwx&!0b  
 ON_BN_CLICKED(ID_CHANGE, OnChange) F I~=A/:  
//}}AFX_MSG_MAP +G+1B6S  
END_MESSAGE_MAP() 7Hj7b:3K&!  
 bDD29  
BOOL CCaptureDlg::OnInitDialog() E33WT{H&_'  
{ uo(LZUjPbN  
 CDialog::OnInitDialog(); 6$l?D^{  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 24wr=5p]Q  
 ASSERT(IDM_ABOUTBOX < 0xF000); K[x=knFO  
 CMenu* pSysMenu = GetSystemMenu(FALSE); "p+JME(  
 if (pSysMenu != NULL) ]f}(i D  
 { X~/-,oV=A  
  CString strAboutMenu; qyh]v[  
  strAboutMenu.LoadString(IDS_ABOUTBOX); #o,FVYYj  
  if (!strAboutMenu.IsEmpty()) cucT |y  
  { ?}= $zN  
   pSysMenu->AppendMenu(MF_SEPARATOR); ~ _IQ:]k  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); riRG9c |  
  } 7r2p+LP[  
 } #w8.aNU+]  
 SetIcon(m_hIcon, TRUE); // Set big icon 5 0a';!H  
 SetIcon(m_hIcon, FALSE); // Set small icon =(~ZmB\  
 m_Key.SetCurSel(0); [+="I &  
 RegisterHotkey(); [.w`r>kZI  
 CMenu* pMenu=GetSystemMenu(FALSE); 5Zmc3&vRl  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); TI\EkKu"  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); \rE] V,,2  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); D(WV k  
 return TRUE; // return TRUE unless you set the focus to a control 3{$>-d  
} NiQ Y3Nj  
: %uaaFl  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) %a:T9v  
{ @VyNe(U  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) l}k'ZX4  
 { Z,"YMUl'  
  CAboutDlg dlgAbout; FlY"OU*  
  dlgAbout.DoModal(); 2fNNdxdbT  
 } HrMbp  
 else EQX<<x"  
 { "-j96 KD  
  CDialog::OnSysCommand(nID, lParam); x(p/9$.#  
 } m\E=I5*/  
} `cIeqp  
E,cQ9}/  
void CCaptureDlg::OnPaint() yU"#2 *C  
{ r;E5e]w*-  
 if (IsIconic()) V#R; -C  
 { ZI8@ 6L\  
  CPaintDC dc(this); // device context for painting /!y;h-  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); P# U|  
  // Center icon in client rectangle lHHx D  
  int cxIcon = GetSystemMetrics(SM_CXICON); t< RPDQ>  
  int cyIcon = GetSystemMetrics(SM_CYICON); Kaaz,C.$^  
  CRect rect; A PrrUo  
  GetClientRect(&rect); M 9NT%7Il  
  int x = (rect.Width() - cxIcon + 1) / 2; J)|I/8!#  
  int y = (rect.Height() - cyIcon + 1) / 2; t:v>W8N53  
  // Draw the icon 2izBB,# "  
  dc.DrawIcon(x, y, m_hIcon); M@p<L VP  
 } ?6L8#"=  
 else 9e}%2,  
 { !|z!e>0  
  CDialog::OnPaint(); 0-57_";%Q  
 } ;%cW[*Dw  
} P"Z1K5>2L  
g@pK9R%wH<  
HCURSOR CCaptureDlg::OnQueryDragIcon() J HV  
{ ?_ v_*+b_  
 return (HCURSOR) m_hIcon; ; 7QG]JX  
} rFUd  
:LC3>x`:  
void CCaptureDlg::OnCancel() IWI$@dng6  
{ x?od_M;*8;  
 if(bTray) r=p^~tuyxr  
  DeleteIcon(); AJ3Byb=.  
  CDialog::OnCancel(); cIK4sOTJ&  
} _1WA:7$C  
.Yz^r?3t  
void CCaptureDlg::OnAbout()  +ZFN8  
{ M&sQnPFH  
 CAboutDlg dlg; CkNh3'<wg  
 dlg.DoModal(); k![H;}W  
} 2 MW7nIEs  
MmFtG-  
void CCaptureDlg::OnBrowse() #&?}h)Jr'  
{ 4r86@^c*  
 CString str; _'^_9u G  
 BROWSEINFO bi; 7Jz 9%iP  
 char name[MAX_PATH]; 2 gca *  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); :"b:uQ  
 bi.hwndOwner=GetSafeHwnd(); Vn\jUEC  
 bi.pszDisplayName=name; j0w@ \gO<  
 bi.lpszTitle="Select folder"; 8:0,jnS  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Der'45]*^  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 7s;;2<k;_  
 if(idl==NULL) 7) a f  
  return; JxEz1~WK &  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); !DHfw-1K  
 str.ReleaseBuffer(); P^U.VXY}  
 m_Path=str; Vock19P  
 if(str.GetAt(str.GetLength()-1)!='\\') 7(P4KvkI  
  m_Path+="\\"; ml!c0<  
 UpdateData(FALSE); BxZ7Bk  
} kpNp}b8']  
tZFpxyF  
void CCaptureDlg::SaveBmp() 'Asr,[]?  
{ 'q RQO(9&m  
 CDC dc; :h!'\9   
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); NW*#./WdF8  
 CBitmap bm; qG9j}[d'  
 int Width=GetSystemMetrics(SM_CXSCREEN); $D D esy3  
 int Height=GetSystemMetrics(SM_CYSCREEN); /s+S\ djk  
 bm.CreateCompatibleBitmap(&dc,Width,Height); -"^xg"  
 CDC tdc; rhly.f7N=A  
 tdc.CreateCompatibleDC(&dc); {+3g*s/HI  
 CBitmap*pOld=tdc.SelectObject(&bm); "" _B3'  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); [/l&:)5W>  
 tdc.SelectObject(pOld); iOL/u)   
 BITMAP btm; ,) aUp4*  
 bm.GetBitmap(&btm); koE]\B2A6  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; d>Nh<PqH6  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); >+>N/`BG  
 BITMAPINFOHEADER bih; %?[0G,JG  
 bih.biBitCount=btm.bmBitsPixel; m`]d`%Ex  
 bih.biClrImportant=0; o02G:!gB  
 bih.biClrUsed=0; 1'8-+?r  
 bih.biCompression=0; Kb1@+  
 bih.biHeight=btm.bmHeight; r:4]:NKCi  
 bih.biPlanes=1; YD{N)v  
 bih.biSize=sizeof(BITMAPINFOHEADER); ?{5}3a bB`  
 bih.biSizeImage=size; X|QokAR{$>  
 bih.biWidth=btm.bmWidth; .])X.7@x  
 bih.biXPelsPerMeter=0; :VLYF$|  
 bih.biYPelsPerMeter=0; Q/*|ADoq  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1+Ik\  
 static int filecount=0; VUz+ _)  
 CString name; FN (O  
 name.Format("pict%04d.bmp",filecount++); -(ST   
 name=m_Path+name; #hMkajG  
 BITMAPFILEHEADER bfh; tF./Jx]_  
 bfh.bfReserved1=bfh.bfReserved2=0; pF8+< T3y  
 bfh.bfType=((WORD)('M'<< 8)|'B'); wjgFe]  
 bfh.bfSize=54+size; \'iy(8i  
 bfh.bfOffBits=54; ]!a?Lr  
 CFile bf; L =M'QJl9  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ U;"J8  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER));  C ?'s  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); s<aG  
  bf.WriteHuge(lpData,size); |`V=hqe{  
  bf.Close();  !$!%era`  
  nCount++; iM6(bmc.  
 } b*{UO  
 GlobalFreePtr(lpData); <U\8&Uv>  
 if(nCount==1) n[# **s  
  m_Number.Format("%d picture captured.",nCount); 7VWy1  
 else V?p`rrj@  
  m_Number.Format("%d pictures captured.",nCount); |`{$Ego:  
  UpdateData(FALSE); i XGy*#>V  
} OPogH=vf  
rR#wbDr5  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 8F's9c,  
{ jpTk@  
 if(pMsg -> message == WM_KEYDOWN) w*o2lg9  
 { !- 5z 1b)  
  if(pMsg -> wParam == VK_ESCAPE) 4mpcI  
   return TRUE; G|"m-.9F  
  if(pMsg -> wParam == VK_RETURN) UISsiiG(  
   return TRUE; .3cD.']%  
 } % I2JS  
 return CDialog::PreTranslateMessage(pMsg); gFfKK`)}D'  
} \ Z5160  
peOoZdJd  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5P 5Tgk  
{ cR*~JwC:  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ AE Elaq.B  
  SaveBmp(); ,068IEs  
  return FALSE; +ef>ek  
} nNnfcA&W  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ =En1?3?  
 CMenu pop; _9Rj,  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); R\/tKZJjb  
 CMenu*pMenu=pop.GetSubMenu(0); _5$L`&  
 pMenu->SetDefaultItem(ID_EXITICON); crSqbL  
 CPoint pt; 3*(><<ZC  
 GetCursorPos(&pt); yx;K&>  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); +kD JZ  
 if(id==ID_EXITICON) +>$Kmy[3  
  DeleteIcon(); yUO%@;  
 else if(id==ID_EXIT) Uty0mc(  
  OnCancel(); t%f>*}*P*  
 return FALSE; sb?!U"v.'  
} ,Z! I^  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); C',uY7}<  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) pr,1pqiAf  
 AddIcon(); AI9922}*  
 return res; :_,3")-v  
} . NxskXq)  
HMmVfGp]  
void CCaptureDlg::AddIcon() y-gXGvZ  
{ giW9b_  
 NOTIFYICONDATA data; I }8b]  
 data.cbSize=sizeof(NOTIFYICONDATA); 1\)lD(J\C  
 CString tip; D>Rlm,U  
 tip.LoadString(IDS_ICONTIP); pZt>rv  
 data.hIcon=GetIcon(0); s|TO9N)pO  
 data.hWnd=GetSafeHwnd(); }"v#_vJfz7  
 strcpy(data.szTip,tip); >}JEX]V  
 data.uCallbackMessage=IDM_SHELL; }LLQ +  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 5 [4{1v  
 data.uID=98; Re'3bs:+  
 Shell_NotifyIcon(NIM_ADD,&data); soX^$l  
 ShowWindow(SW_HIDE); Ae1b`%To  
 bTray=TRUE; ^<   
} *Gj`1# Z$  
Ag8lI+ h  
void CCaptureDlg::DeleteIcon() 1Y~'U =9  
{ 4-$kc wA  
 NOTIFYICONDATA data; U:[CcN/~3  
 data.cbSize=sizeof(NOTIFYICONDATA); hPCSAo!|  
 data.hWnd=GetSafeHwnd(); #MiO4zXgd  
 data.uID=98; 8+32hg@^F  
 Shell_NotifyIcon(NIM_DELETE,&data); we@*;k@_  
 ShowWindow(SW_SHOW); U!JmSP  
 SetForegroundWindow(); Xf mN/j2  
 ShowWindow(SW_SHOWNORMAL); :lmimAMt  
 bTray=FALSE; ?@MWV   
} &!HG.7AY  
6q `Un}  
void CCaptureDlg::OnChange() h,b_8g{!  
{ $Q,]2/o6n  
 RegisterHotkey(); ;M\Cw.%![  
} 5Kk}sxol  
L%-ENk  
BOOL CCaptureDlg::RegisterHotkey() +"~*L,ken0  
{ 0 wDhX  
 UpdateData(); w]V684[>  
 UCHAR mask=0; G9K& }_,  
 UCHAR key=0; >enP~uW[#  
 if(m_bControl) ,_=LV  
  mask|=4; Z^mQb2e.  
 if(m_bAlt) /BhP`a%2Q  
  mask|=2; 'GO *6$/  
 if(m_bShift) ,Z7Ky*<j  
  mask|=1; Fx)><+-  
  key=Key_Table[m_Key.GetCurSel()]; VD =f 'D  
 if(bRegistered){ P\z1fscnK  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); =2vZqGO30  
  bRegistered=FALSE; lh!8u<yv*  
 } Uv=)y^H~*A  
 cMask=mask; 8p1:dTI5Pb  
 cKey=key; d(| 4 +^>  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 5-S-r9  
 return bRegistered; `FX?P`\@I  
} PQz[IZ  
O<dCvH  
  四、小结 1W}k>t8?h'  
Hd gABIuX  
  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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