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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: o> yo9n%t  
  "QM2YJ55m`  
  一、实现方法 BXUd i&'O  
BqDOo(%1)  
  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: a-9sc6@  
]9hhAT44  
#pragma data_seg("shareddata") hu:x,;`9H  
HHOOK hHook =NULL; //钩子句柄 Enqs|fkbN  
UINT nHookCount =0; //挂接的程序数目 &P gk$e%>  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 q (}#{OO  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 x24&mWgU  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey M3H^s_  
static int KeyCount =0; ]u"x=S93  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 b R9iqRbn  
#pragma data_seg() @0iXqM#jH  
5>rjL ;  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 .a}!!\@  
>!#or- C  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 5h p)Z7  
pY(S]i  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ?#  )\SQ  
cKey,UCHAR cMask) S5wkBdr{  
{ &dJ\}O[r  
 BOOL bAdded=FALSE; -<^3!C >  
 for(int index=0;index<MAX_KEY;index++){ <Sp>uhet1  
  if(hCallWnd[index]==0){ Tywrh9[  
   hCallWnd[index]=hWnd; -FQS5Zb.!  
   HotKey[index]=cKey; It5n;,n  
   HotKeyMask[index]=cMask; {e83 A /{  
   bAdded=TRUE; >;k~B  
   KeyCount++; =v~$&@  
   break; .< -~k@ P  
  } GD#W=O  
 } M.KXDD#O  
 return bAdded; )!d_Td\-  
} 9a{9|p>L  
//删除热键 > `+lEob  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) gBo~NLrf  
{ 6('xIE(R  
 BOOL bRemoved=FALSE; wW0m}L  
 for(int index=0;index<MAX_KEY;index++){ &_$xMM,X  
  if(hCallWnd[index]==hWnd){ <"!'>ZUt  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ +!"7=?}  
    hCallWnd[index]=NULL; wKAxUPzm  
    HotKey[index]=0; QHe:  
    HotKeyMask[index]=0; c_syJ<  
    bRemoved=TRUE; =<z~OE'lV  
    KeyCount--; !24g_R[3"  
    break; bs_rw+  
   } <u2iXH5w  
  } c/`Rv{ *'o  
 } GlaZZ,   
 return bRemoved; *jo1?  
} <"x *ZT  
r }Nq"s<  
jx8hh}C  
  DLL中的钩子函数如下: vjYG>YhV  
t++\&!F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) luV_  
{ G>W:3y  
 BOOL bProcessed=FALSE; ^uIKwql  
 if(HC_ACTION==nCode) ]`eJSk.  
 { X*rB`M7,  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 "gq _^&  
   switch(wParam) Vvk \ $'  
   {  [`=:uUf3  
    case VK_MENU: S-G#+ Ue2  
     MaskBits&=~ALTBIT; Ui;PmwQc&  
     break; 4mF=A$Q_/  
    case VK_CONTROL:  `/eh  
     MaskBits&=~CTRLBIT; JL&ni]m  
     break; uCGn9]  
    case VK_SHIFT: +ZeK,Y+Xy  
     MaskBits&=~SHIFTBIT; T!gq Z  
     break; U%_6'5s{^  
    default: //judge the key and send message Y'M}lv$sa  
     break; d,%@*v]S  
   } ]e]hA@4  
   for(int index=0;index<MAX_KEY;index++){ }}~ t! /x  
    if(hCallWnd[index]==NULL) Pna2IB+  
     continue; C~:!WRCz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wfc+E9E  
    { ,v*<yz/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  B<?fD  
     bProcessed=TRUE; S[o R q  
    } 6Pu5 k;H  
   } |Xa|%f  
  }  Q-Rt  
  else if((lParam&0xc000ffff)==1){ //有键按下 %TRH,-@3h  
   switch(wParam) 5}_DyoV  
   { qGc>+!y  
    case VK_MENU: 8sxH)"S  
     MaskBits|=ALTBIT; Gzu $  
     break; ' C|yUsBC  
    case VK_CONTROL: z3p #`  
     MaskBits|=CTRLBIT; @ei:/~y3  
     break; D1<$]r,  
    case VK_SHIFT: @X*r5hjc  
     MaskBits|=SHIFTBIT; Z  )dz  
     break; ~`x<;Ts  
    default: //judge the key and send message =8)q-{p3  
     break; \m;"KyP+  
   } WXC}Ie  
   for(int index=0;index<MAX_KEY;index++){ v_Y'o _  
    if(hCallWnd[index]==NULL) 'HDbU#vD  
     continue; )x*pkE**c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^YG.eT6iG  
    { J#'+&D H  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); "Hw%@  
     bProcessed=TRUE; {,rVA(I@  
    } +A,t9 3:k  
   } -KG3_kE  
  } d>qxaX;  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ="*8ja-K  
   for(int index=0;index<MAX_KEY;index++){ /K]<7  
    if(hCallWnd[index]==NULL) (j;6}@  
     continue; >O&:[CgEF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5=--+8[ bV  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ij=}3;L_!  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 !xxu~j^T  
   } bqDHLoB\1  
  } i@M^9|Gh  
 } X%._:st  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); I5J9,j  
} ard<T}|N  
g np\z/'>  
  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: } 6Uw4D61  
Z{ A)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )} H46  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0FV?By  
gqRwN p  
  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: Ysk,9MR(F  
R2af>R  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?][2J  
{ zU9G: jH  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) nVC:5ie  
 { Ge>%?\  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 N}3$1=@Y  
  SaveBmp(); f: h.O# d>  
  return FALSE; v@0lTl_  
 } Uaho.(_GP  
 …… //其它处理及默认处理 8@|rB3J  
} {g>k-.  
,rp-`E5ap  
ec4jiE  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 c2z%|\q  
~_TmS9  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 .f V-puE  
G w$sL&1m\  
  二、编程步骤 oA kF  
[*j C  
  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"; iTt"Ik'  
tZ]|3wp  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; s9<fPv0w  
7)IB IlV  
  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; $SQ8,Y,  
9K@>{69WQ  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; :4"SJ  
u":D{+wC |  
  5、 添加代码,编译运行程序。 XB)e;R  
oVsj Q  
三、程序代码 &t +   
u:pdY'`"#  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL X3DXEeBEL  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) JrTSu`S('  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ _M+'30  
#if _MSC_VER > 1000 sD$ \!7:b  
#pragma once <_ 02)6j  
#endif // _MSC_VER > 1000 I72UkmK`  
#ifndef __AFXWIN_H__ 6y,M+{  
#error include 'stdafx.h' before including this file for PCH 22\Buk}?  
#endif C+Wb_  
#include "resource.h" // main symbols }(AUe5aw`G  
class CHookApp : public CWinApp 2B_6un];W  
{ aC>r5b#:  
 public: n37C"qJ/i  
  CHookApp(); e0HG"z4  
  // Overrides ?#xNz=V  
  // ClassWizard generated virtual function overrides BBw`8!  
  //{{AFX_VIRTUAL(CHookApp) hi>Ii2T  
 public: ^Ois]#py  
  virtual BOOL InitInstance(); |EaGKC(   
  virtual int ExitInstance(); h:(Jes2  
  //}}AFX_VIRTUAL PG9won5_  
  //{{AFX_MSG(CHookApp) +~=>72/r  
  // NOTE - the ClassWizard will add and remove member functions here. tnbaU%;|J  
  // DO NOT EDIT what you see in these blocks of generated code ! )1O *~%  
  //}}AFX_MSG [kzcsJ'/e  
  DECLARE_MESSAGE_MAP() Qp<?[C}'W  
}; n<Z;Xh~F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); sMli!u  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); A6}M F  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]Ole#Lz}Q  
BOOL InitHotkey(); f3U#|(%(*  
BOOL UnInit(); ?V#%^ 57p  
#endif UuAn`oYhV  
_%!C;`3Y  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ^LTLyt)/  
#include "stdafx.h" SY["(vP%#  
#include "hook.h" iwCnW7:  
#include <windowsx.h> ai`fP{WlX  
#ifdef _DEBUG JV/K ouL  
#define new DEBUG_NEW W&}R7a@:<~  
#undef THIS_FILE qeBfE  
static char THIS_FILE[] = __FILE__; z++*,2F  
#endif ]$4k+)6  
#define MAX_KEY 100 fk5!/>X  
#define CTRLBIT 0x04 W7WHH \L/O  
#define ALTBIT 0x02 ']ya_v~e  
#define SHIFTBIT 0x01 XK`>#*"V  
#pragma data_seg("shareddata") mK%!9F V  
HHOOK hHook =NULL; (WVN*OR?  
UINT nHookCount =0; =IkQ;L&  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Kg VLXI6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT YKJk)%;+w  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey I')URk[  
static int KeyCount =0; J*-m!0 5  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Ih;6(5z  
#pragma data_seg() <?yAIhgN*  
HINSTANCE hins; czi$&(N0w$  
void VerifyWindow(); glH&v8  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) `4'v)!?  
//{{AFX_MSG_MAP(CHookApp) pZ/x,b#.  
// NOTE - the ClassWizard will add and remove mapping macros here. 05g U~6AF  
// DO NOT EDIT what you see in these blocks of generated code! 4rO07)~l  
//}}AFX_MSG_MAP WB'&W=  
END_MESSAGE_MAP() @N7X(@O  
yH;=Y1([  
CHookApp::CHookApp() >to NGGU=~  
{ S)iv k x  
 // TODO: add construction code here, ~ k/'_1)c  
 // Place all significant initialization in InitInstance &$lz@Z  
} i~@e}=  
r,(rWptf4  
CHookApp theApp; `J|bGf#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) j5Vyo>  
{ EA7 8&  
 BOOL bProcessed=FALSE; q{ItTvL  
 if(HC_ACTION==nCode) (@B gsY  
 { 1#qyD3K  
  if((lParam&0xc0000000)==0xc0000000){// Key up "a6[FqTs  
   switch(wParam) \EuMzb"G9p  
   { /csj(8^w  
    case VK_MENU: G#t!{Q}8  
     MaskBits&=~ALTBIT; <.HX_z3l  
     break; Z `sM(?m  
    case VK_CONTROL: 7;:R\d6iL  
     MaskBits&=~CTRLBIT; =H%c/Jty  
     break; sWX iY  
    case VK_SHIFT: _Jx.?8  
     MaskBits&=~SHIFTBIT; Y #E/"x%+  
     break; )cJ9YKKy  
    default: //judge the key and send message (2RZc].M~  
     break; X`/8fag  
   } ]dHU  
   for(int index=0;index<MAX_KEY;index++){ K'kWL[Ut!  
    if(hCallWnd[index]==NULL) qPDe;$J)  
     continue; m/Ou$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) H:Y?("k  
    { 1v)ur\>R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); vnwS &;-k~  
     bProcessed=TRUE; Au<NUc 2  
    } ShbW[*5  
   } Tf(-Duxz  
  } 89e<,f`h  
  else if((lParam&0xc000ffff)==1){ //Key down fQ33J>  
   switch(wParam) w/BaaF.0  
   { Y> ElE-  
    case VK_MENU: 1O3"W;SR<:  
     MaskBits|=ALTBIT; ZFpi'u.&  
     break; >Vc;s !R  
    case VK_CONTROL: P>n}\"z4  
     MaskBits|=CTRLBIT; M:K5r7Q!yv  
     break; `1k0wT(  
    case VK_SHIFT: ~iI4v#0  
     MaskBits|=SHIFTBIT; 1(t{)Z<  
     break; vncLB&@7  
    default: //judge the key and send message HjCcfOej  
     break; -7{qTe {  
   } uvC ![j^~  
   for(int index=0;index<MAX_KEY;index++) :j feY  
   { $fZVh%  
    if(hCallWnd[index]==NULL) 'b(V8x  
     continue; 4+46z|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U0>Uqk",  
    { 1 ? be  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $bSnbU <  
     bProcessed=TRUE; x[L/d"Wf  
    } r0jhIE#  
   } DvL/xlN  
  } =, kH(rp2  
  if(!bProcessed){ S 2vjjS  
   for(int index=0;index<MAX_KEY;index++){ J; @g#h?  
    if(hCallWnd[index]==NULL) JR>v  
     continue; e+416 ~X v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) mtfEK3?2*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); a(cZ]`s]*  
   } U4PnQ K,  
  } `wrN$&  
 } ~t0\Q; @($  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); BuwJR Ql.  
} 4l)Q  
";vP77|m7R  
BOOL InitHotkey() xn1=@0 a  
{ XNZW J  
 if(hHook!=NULL){ \M(#FS  
  nHookCount++; lxSCN6  
  return TRUE; ?-.Qv1hs6p  
 } ~# ~XDcc  
 else (c3%rM m]  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); #21t8  
  if(hHook!=NULL) (zv)cw%  
   nHookCount++; bIs@CDB  
  return (hHook!=NULL); 0{0A,;b  
} 0xZX%2E  
BOOL UnInit() #}y(D{zc  
{ `-,yJ  
 if(nHookCount>1){ 83~9Xb=!\  
  nHookCount--; f3bZ*G%f  
  return TRUE; iRwlK5(&  
 } P%%[_6<%M  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Wa{()Cz  
 if(unhooked==TRUE){ cx_.+R  
  nHookCount=0; J|Af`HJ  
  hHook=NULL; g#Doed.30=  
 } kuEB  
 return unhooked; :f9O3QA  
} 8r|5l~`8  
cbHb!Lbg  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (K"8kQLY  
{ /d/Quro  
 BOOL bAdded=FALSE; u=mJI*  
 for(int index=0;index<MAX_KEY;index++){ {\87]xJ  
  if(hCallWnd[index]==0){ F~qiNV  
   hCallWnd[index]=hWnd; "@h 5 SF  
   HotKey[index]=cKey; c"<bq}L7S  
   HotKeyMask[index]=cMask; JE[+  
   bAdded=TRUE; kJy bA  
   KeyCount++; ,pc\ )HR  
   break; @qGg=)T  
  } y%9Q]7&=  
 } x?|C-v  
 return bAdded; bM%c*_$F7  
} ^KK9T5H  
1zz.`.R2U  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) T-'B-g  
{ .W9/*cZV0  
 BOOL bRemoved=FALSE; p]7Gj &a  
 for(int index=0;index<MAX_KEY;index++){ XIrNT:h4  
  if(hCallWnd[index]==hWnd){ WecJ^{g>r{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >Za66<:  
    hCallWnd[index]=NULL; e1k\:]6  
    HotKey[index]=0;  fK$N|r  
    HotKeyMask[index]=0; Xc^7  
    bRemoved=TRUE; uy,ySBY  
    KeyCount--; N,><,7!q$,  
    break; H$ sNp\[{  
   } <_|H]^o  
  } v7l4g&  
 } X> *o\   
 return bRemoved; @c8s<9I]  
} C~5-E{i  
)~](qLSl  
void VerifyWindow() =&- hU|ur  
{ z~g7O4#  
 for(int i=0;i<MAX_KEY;i++){ Kk^tQwj/QE  
  if(hCallWnd!=NULL){ 's]+.3">L1  
   if(!IsWindow(hCallWnd)){ [|sKu#yW  
    hCallWnd=NULL; |sw&sfH[FD  
    HotKey=0; J6!t"eB+  
    HotKeyMask=0; WAj26";M(  
    KeyCount--; '9,14e6   
   } =](c7HEQf  
  } d E@R7yU@  
 } \bh3&Z'.  
} o3;u*f0rWn  
GXEOgf#i  
BOOL CHookApp::InitInstance() ':7%@2Zo  
{ {C%/>e2-%  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); lA4Bq  
 hins=AfxGetInstanceHandle(); |wf:|%  
 InitHotkey(); /HNZwbh]uJ  
 return CWinApp::InitInstance(); (u]ajT  
} ksxacRA7\  
;3n0 bKDY  
int CHookApp::ExitInstance() i\S } aCm  
{ yG0Wr=/<?  
 VerifyWindow(); 6(4o}Sv  
 UnInit(); 9?*BN\E5S  
 return CWinApp::ExitInstance(); ^i{B8]2,  
} `d=$9Pi  
~6'6v 8  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file x5m .MQ J  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) %E7+W{?*1  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ tg~&kaz  
#if _MSC_VER > 1000 6|#^4D)  
#pragma once i:WHql"Kw_  
#endif // _MSC_VER > 1000 #VC^><)3  
+1p>:cih  
class CCaptureDlg : public CDialog ;0xCrE{l"  
{ Rv q_Zsm  
 // Construction /Fh"Gl^  
 public: V{Idj\~Jh  
  BOOL bTray; q) /;|h  
  BOOL bRegistered; 6FSw_[)  
  BOOL RegisterHotkey(); \\hZlCV,  
  UCHAR cKey; lIzJO$8cM  
  UCHAR cMask; A>>@&c:(  
  void DeleteIcon(); gRdE6aIZ  
  void AddIcon(); '[Oi_gE.  
  UINT nCount; =]xNpX)  
  void SaveBmp();  2WE   
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor um#;S;  
  // Dialog Data 6{azzk8  
  //{{AFX_DATA(CCaptureDlg) h#]}J}si  
  enum { IDD = IDD_CAPTURE_DIALOG }; DGHX:Ft#  
  CComboBox m_Key; D{'Na5(  
  BOOL m_bControl; 1V+1i)+  
  BOOL m_bAlt; AV d  
  BOOL m_bShift; >w j7Y`  
  CString m_Path; #yr19i ?  
  CString m_Number; GeHDc[7  
  //}}AFX_DATA W]2;5 `MM  
  // ClassWizard generated virtual function overrides 'R]Z9h  
  //{{AFX_VIRTUAL(CCaptureDlg) x ;Gyo  
 public: {f^30Fw  
  virtual BOOL PreTranslateMessage(MSG* pMsg); n"FOCcTIs  
 protected: -'}iK6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3:Z(tM&-O  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ( ?/0$DB  
  //}}AFX_VIRTUAL Gzp)OHgJ  
  // Implementation B.P64"w  
 protected: 3gabk/  
  HICON m_hIcon; (QRl -| +  
  // Generated message map functions qFs<s<]  
  //{{AFX_MSG(CCaptureDlg) =u'/\nxCF  
  virtual BOOL OnInitDialog(); njq-iU  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ^@19cU?q  
  afx_msg void OnPaint(); kcOpO<oE  
  afx_msg HCURSOR OnQueryDragIcon(); ,3n}*"K  
  virtual void OnCancel(); [/G;XHL;?  
  afx_msg void OnAbout(); &}O!l'  
  afx_msg void OnBrowse(); 3U)8P6Fz  
  afx_msg void OnChange(); <Xx\F56zp  
 //}}AFX_MSG l/zC##1+.  
 DECLARE_MESSAGE_MAP() QhQ"OVFr#  
}; cvE.r330|  
#endif Yc`j   
wZ8 MhE  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file U!?gdX  
#include "stdafx.h" ds;cfj[  
#include "Capture.h" e ]o'i;I  
#include "CaptureDlg.h" Wk#h,p3  
#include <windowsx.h> ?7MwTi8{F  
#pragma comment(lib,"hook.lib") 3*$9G)Ey  
#ifdef _DEBUG }BdVD t  
#define new DEBUG_NEW nIQ&gbfO  
#undef THIS_FILE C]yQ "b  
static char THIS_FILE[] = __FILE__; <o!&Kk9  
#endif Secq^#]8  
#define IDM_SHELL WM_USER+1 o.3YM.B#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); bk"k&.C^+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hMeqs+  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 9/ 1+BQ  
class CAboutDlg : public CDialog TT2cOw  
{ 4 %)N(%u  
 public: pq[X)]z|  
  CAboutDlg(); Afy .3T @)  
  // Dialog Data Kka8cG  
  //{{AFX_DATA(CAboutDlg) #CA%]*l*F  
  enum { IDD = IDD_ABOUTBOX }; daB l%a=  
  //}}AFX_DATA =vr Y{5!>  
  // ClassWizard generated virtual function overrides mw(c[.*%  
  //{{AFX_VIRTUAL(CAboutDlg) Cb{A:\>Q{  
 protected: m io1kDq<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support QGr\I/Y  
  //}}AFX_VIRTUAL 8VuZ,!WH#  
  // Implementation 6b ]1d04hT  
 protected: ;EJPrDHTk  
  //{{AFX_MSG(CAboutDlg) n{^<&GWox  
  //}}AFX_MSG lH)em.#  
  DECLARE_MESSAGE_MAP() Z.:<TrN  
}; XpgV09.EE  
cK[R1 ReH  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) &I RA=nJ  
{ Z>x7|Q3CX  
 //{{AFX_DATA_INIT(CAboutDlg) B6ed,($&  
 //}}AFX_DATA_INIT 6Q2or n[  
} z|3`0eWIG  
Any Zi'  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) *H5PT  
{ lk_s!<ni  
 CDialog::DoDataExchange(pDX); w|}W(=#  
 //{{AFX_DATA_MAP(CAboutDlg) #9$V 08  
 //}}AFX_DATA_MAP Ht|",1yr+  
} *D?((_+  
_Z+jQFKJ\8  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) \E$1lc  
 //{{AFX_MSG_MAP(CAboutDlg) 4= Tpi`  
 // No message handlers 'Aj(i/CM  
 //}}AFX_MSG_MAP _%wK}eH+sy  
END_MESSAGE_MAP() ~$4]HDg  
psIkG0 &  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) h; 'W :P  
: CDialog(CCaptureDlg::IDD, pParent) .3{[_iTM  
{ |N:MZ#};  
 //{{AFX_DATA_INIT(CCaptureDlg) $ViojW>  
  m_bControl = FALSE; J>=1dCK  
  m_bAlt = FALSE; >`7OcjLg  
  m_bShift = FALSE; K2cq97k,d  
  m_Path = _T("c:\\"); 5v|H<wPp  
  m_Number = _T("0 picture captured."); :E>&s9Yj?  
  nCount=0; $gVLk.  
  bRegistered=FALSE; [_WI8~g Y  
  bTray=FALSE; ;>9OgO  
 //}}AFX_DATA_INIT k)`$%[K8  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 },DyU  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 2)wAFO6u  
} &/s~? Iq  
aS,a_b]  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) i?F[||O"$  
{ nVxq72o@  
 CDialog::DoDataExchange(pDX); j]pohxn$5  
 //{{AFX_DATA_MAP(CCaptureDlg) 3->,So0Y  
  DDX_Control(pDX, IDC_KEY, m_Key); EdEoXY-2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); PzjaCp'  
  DDX_Check(pDX, IDC_ALT, m_bAlt); {Q)dU-\  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); |*:tyP%m^  
  DDX_Text(pDX, IDC_PATH, m_Path); )ZH c$+fU  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 5U%MoH  
 //}}AFX_DATA_MAP >;)2NrJV  
} %yp5DD}|  
#(6) ^ (  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) BI};"y  
//{{AFX_MSG_MAP(CCaptureDlg) ]/Vh{d|I&  
 ON_WM_SYSCOMMAND() rFo\+//  
 ON_WM_PAINT() q]px(  
 ON_WM_QUERYDRAGICON() ^IBGYl5n  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) #+9rjq:v#]  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) GuT6K}~|D  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 6O9iEc,HM  
//}}AFX_MSG_MAP 20aZI2sk`  
END_MESSAGE_MAP() Y]N~vD  
dIk' pA^d  
BOOL CCaptureDlg::OnInitDialog() /}Yqf`CZy  
{ M#xQW`-`  
 CDialog::OnInitDialog(); s2%V4yy%  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ob E:kNE9  
 ASSERT(IDM_ABOUTBOX < 0xF000); 4QE=f(u;h  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ;hwzYXWF  
 if (pSysMenu != NULL) ' WQdr(  
 { "V4Q2T T  
  CString strAboutMenu; L}$z/jo  
  strAboutMenu.LoadString(IDS_ABOUTBOX); T"?Y5t`(  
  if (!strAboutMenu.IsEmpty()) I5qM.@%zB  
  { daslaa_A  
   pSysMenu->AppendMenu(MF_SEPARATOR); +3;Ody"59  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 9@n diu[  
  } DzC Df@TB"  
 } Lz@$3(2  
 SetIcon(m_hIcon, TRUE); // Set big icon f2yq8/J8.  
 SetIcon(m_hIcon, FALSE); // Set small icon gfde#T)S  
 m_Key.SetCurSel(0); =q+R   
 RegisterHotkey(); ydQ!4  
 CMenu* pMenu=GetSystemMenu(FALSE); Q(Gyq:L=>  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); URA0ey`  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Z~p!C/B  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); qZ*f%L(  
 return TRUE; // return TRUE unless you set the focus to a control ;F5"}x  
} 4(=kE>n}  
2no$+4+z  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) NQX>Qh 2  
{ byGn,m  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) XA<ozq'  
 { l!?yu]Yon  
  CAboutDlg dlgAbout; 2.-o@im0  
  dlgAbout.DoModal(); {\G `]r-cM  
 } Zw{MgoJ0Z  
 else ~$<UE}qp  
 { I[0!S IqY  
  CDialog::OnSysCommand(nID, lParam); +C+<BzR~A.  
 } PD6_)PXn  
} j*400  
M;jcUX_{  
void CCaptureDlg::OnPaint() Wd8R u/  
{ 5u$D/* Eb  
 if (IsIconic()) &|9.}Z8U  
 { BT,b-= ;J-  
  CPaintDC dc(this); // device context for painting lpgd#vr  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); M`7y>Ud  
  // Center icon in client rectangle kWhr1wR1  
  int cxIcon = GetSystemMetrics(SM_CXICON); NHm]`R,  
  int cyIcon = GetSystemMetrics(SM_CYICON); Ez+Z[*C  
  CRect rect; !eI2 r   
  GetClientRect(&rect); T2FE+A]n9  
  int x = (rect.Width() - cxIcon + 1) / 2; uO6{r v\  
  int y = (rect.Height() - cyIcon + 1) / 2; <a( }kk}  
  // Draw the icon %lw! e  
  dc.DrawIcon(x, y, m_hIcon); upy\gkpnGO  
 } Kibr ]w  
 else h-#1U3d  
 { [?k8}B)mHB  
  CDialog::OnPaint(); +B}0=Ex$t  
 } x,n,Qlb  
} r'GP$0rr9!  
?6^|ZtB  
HCURSOR CCaptureDlg::OnQueryDragIcon() B<?w h0  
{ fCWGAO2  
 return (HCURSOR) m_hIcon; O+vS|  
} 5PT5#[  
ntVS:F  
void CCaptureDlg::OnCancel() r^Zg-|gr  
{ `=lc<T^  
 if(bTray) R?o$Y6}5  
  DeleteIcon(); d5`3wd]]'v  
  CDialog::OnCancel(); v'!a\b`9  
} v\tEVhm  
iB[~U3  
void CCaptureDlg::OnAbout() n+;6=1d7ZW  
{ s$D ^>0  
 CAboutDlg dlg; TS2ZF{m  
 dlg.DoModal(); "pP^*9FrA  
} h:Gu`+D>W  
~Wo)?q8UY,  
void CCaptureDlg::OnBrowse() 6 5N~0t  
{ F8:vDv  
 CString str; ^T"vX  
 BROWSEINFO bi; y*pUlts<  
 char name[MAX_PATH]; W\&8au ds  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); {8)zg<rL+M  
 bi.hwndOwner=GetSafeHwnd(); (0YZZ93  
 bi.pszDisplayName=name; ?T9(Vw  
 bi.lpszTitle="Select folder"; 2'EUy@0  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Y2o?gug  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); tg]x0#@s  
 if(idl==NULL) mGp.3{j  
  return; }by;F9&B  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ;r_F[E2z  
 str.ReleaseBuffer(); Q8!) !r%  
 m_Path=str; &e 6CJ  
 if(str.GetAt(str.GetLength()-1)!='\\') ])xx<5Jt4  
  m_Path+="\\"; I!e})Y  
 UpdateData(FALSE); a}%#*J)!  
} ]E\n9X-{  
UfN&v >8f  
void CCaptureDlg::SaveBmp() uwz)($~bp  
{ Vn*tp bz  
 CDC dc; oE#d,Z  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); rE}%KsZ  
 CBitmap bm; ZI=%JU(  
 int Width=GetSystemMetrics(SM_CXSCREEN); Re P|UH  
 int Height=GetSystemMetrics(SM_CYSCREEN); }ZYv~E'  
 bm.CreateCompatibleBitmap(&dc,Width,Height); bGc~Wr|  
 CDC tdc; (h >-&.`&  
 tdc.CreateCompatibleDC(&dc); UrqRx?#  
 CBitmap*pOld=tdc.SelectObject(&bm); %Ev4]}2C1  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6Yx4lWBR?  
 tdc.SelectObject(pOld); G6T_O  
 BITMAP btm; -$\+' \  
 bm.GetBitmap(&btm); .zi_[  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {NHdyc$  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); D#3\y*-y?  
 BITMAPINFOHEADER bih; 1v71rf&w  
 bih.biBitCount=btm.bmBitsPixel; j'A_'g'^  
 bih.biClrImportant=0; ^s|6vd;PD=  
 bih.biClrUsed=0; V5UF3'3;}  
 bih.biCompression=0; a(l29>  
 bih.biHeight=btm.bmHeight; ;M)QwF1  
 bih.biPlanes=1; 3j\1S1  
 bih.biSize=sizeof(BITMAPINFOHEADER); KET2Ws[w  
 bih.biSizeImage=size; |S_eDjF  
 bih.biWidth=btm.bmWidth; U4d:] z  
 bih.biXPelsPerMeter=0; 6}d.5^7lr  
 bih.biYPelsPerMeter=0; uScMn/%  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); OX\A|$GS  
 static int filecount=0; kqFP)!37  
 CString name; ML|FQ  
 name.Format("pict%04d.bmp",filecount++); k?+?v?I =  
 name=m_Path+name; )h7<?@wv&  
 BITMAPFILEHEADER bfh; &litXIvT>  
 bfh.bfReserved1=bfh.bfReserved2=0; U|jSa,}  
 bfh.bfType=((WORD)('M'<< 8)|'B'); P GqQ@6B  
 bfh.bfSize=54+size; \W~ N  
 bfh.bfOffBits=54; 1q7|OWFT  
 CFile bf; .+$ Q<L  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ A1O' |7X  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); RoPRQCE  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Fld=5B^}  
  bf.WriteHuge(lpData,size); -XB/lnG  
  bf.Close(); LRL,m_gt  
  nCount++; T;r2.Pupn  
 } ;r<^a6B  
 GlobalFreePtr(lpData); R!}H;[c  
 if(nCount==1) b,7k)ND1F  
  m_Number.Format("%d picture captured.",nCount); T&6l$1J  
 else u_oaebOrpP  
  m_Number.Format("%d pictures captured.",nCount); CsGx@\jN  
  UpdateData(FALSE); 9jM}~XvV  
} -t!~%_WCv  
Bs^aII$  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ;U/&I3dzV  
{ OP[  @k  
 if(pMsg -> message == WM_KEYDOWN) =$'6(aDH  
 { >mwlsL~X  
  if(pMsg -> wParam == VK_ESCAPE) &u$Q4  
   return TRUE; oB(?_No7  
  if(pMsg -> wParam == VK_RETURN) (7wc*#}  
   return TRUE; oH97=>  
 } 3l rT3a3vV  
 return CDialog::PreTranslateMessage(pMsg); mE+*)gb:Rd  
} , qMzWa  
n] ._uza  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Cio 1E-4  
{ J!dm-L  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ G#ZH.24Y  
  SaveBmp(); PxvyN_B#>  
  return FALSE; T<n  
} kMIcK4.MH  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ *& BQTZ6  
 CMenu pop; o_izl \  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 1+_`^|eK  
 CMenu*pMenu=pop.GetSubMenu(0); t% d Z-Ym  
 pMenu->SetDefaultItem(ID_EXITICON); YL!P0o13r  
 CPoint pt; 0"jY.*_EW  
 GetCursorPos(&pt); Wf+cDpK  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 01 }D,W`  
 if(id==ID_EXITICON) 3#LlDC_WC  
  DeleteIcon(); Z@4Ar fl  
 else if(id==ID_EXIT) uy>q7C  
  OnCancel(); x[ SDl(<@;  
 return FALSE; 4>wP7`/+y  
} 7r6.n61F  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); "{A(x }'Y4  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {5Q!Y&N.%  
 AddIcon(); X]ipI$'+C  
 return res; R)c?`:iUB  
} {i;r  
u+9hL4  
void CCaptureDlg::AddIcon() yl'u'-Zb6  
{ /ixp&Z|7  
 NOTIFYICONDATA data; /J]5H  
 data.cbSize=sizeof(NOTIFYICONDATA); tj'\tW+s'  
 CString tip; { a =#B)6  
 tip.LoadString(IDS_ICONTIP); `aOFs+<)  
 data.hIcon=GetIcon(0); p?02C# p  
 data.hWnd=GetSafeHwnd(); lov!o: dJ  
 strcpy(data.szTip,tip); K%t*8 4j  
 data.uCallbackMessage=IDM_SHELL; em y[k  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; _qF+tm  
 data.uID=98; lt/1f{v[:  
 Shell_NotifyIcon(NIM_ADD,&data); 8'[~2/  
 ShowWindow(SW_HIDE); ,V7nzhA2  
 bTray=TRUE; ncaT?~u j  
} -{("mR&]  
R|'ybW'Y  
void CCaptureDlg::DeleteIcon() EfqX y>W  
{ T~-ycVc  
 NOTIFYICONDATA data; %U/(|wodd  
 data.cbSize=sizeof(NOTIFYICONDATA); F|`Hm  
 data.hWnd=GetSafeHwnd(); M$ wC=b  
 data.uID=98; <;lkUU(WT2  
 Shell_NotifyIcon(NIM_DELETE,&data); 1v y*{D  
 ShowWindow(SW_SHOW); VMZMG$C  
 SetForegroundWindow(); Z*F3G#A  
 ShowWindow(SW_SHOWNORMAL); r-,%2y?  
 bTray=FALSE; HVRZ[Y<^  
} &s(^@OayE  
 -uS!\  
void CCaptureDlg::OnChange() 1Yq!~8  
{ `Gs9Xmc|  
 RegisterHotkey(); 'B |JAi?  
} yNPVOp*  
"MeVE#O  
BOOL CCaptureDlg::RegisterHotkey() +L$Xv  
{ =F|{# F  
 UpdateData(); O 2V  
 UCHAR mask=0; 6bg ;q(*7  
 UCHAR key=0; b1I]>\  
 if(m_bControl) !aUs>1i  
  mask|=4; &$+AXzn  
 if(m_bAlt) wLIMv3;k  
  mask|=2; 4Z3su^XR  
 if(m_bShift) }CSDV9).S  
  mask|=1; 2DA]i5  
  key=Key_Table[m_Key.GetCurSel()];  m!!/Za  
 if(bRegistered){ z^B,:5Tt  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 70?\ugxA  
  bRegistered=FALSE;  }FROB/  
 } G[PtkPSJ  
 cMask=mask; sI=xl  
 cKey=key; Fe*R  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); &u."A3(  
 return bRegistered; aqZi:icFa  
} yZY\MB/  
~ah~cwmpS  
  四、小结 6q\bB  
[>I<#_^~  
  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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