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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: 6m;wO r  
  =>9.@`.  
  一、实现方法 <}x|@u  
MIMPJXT#.  
  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: )MX1776kU  
1dgN10  
#pragma data_seg("shareddata") %lqG*dRx0  
HHOOK hHook =NULL; //钩子句柄 X G@>1/  
UINT nHookCount =0; //挂接的程序数目 pN^G[  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 szM=U$jKq  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 U mx  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Z({`9+/>u  
static int KeyCount =0; R~seUW7uv"  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 1PT_1[eAR  
#pragma data_seg() H&>>]DD  
;wYwiSVd  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 .tHv4.ob  
q}76aa0e  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: *7D$;?"  
uvK%d\d  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR " :nVigw&  
cKey,UCHAR cMask) ;r@R (Squ  
{ bU g2Bm!y  
 BOOL bAdded=FALSE; \5L4*  
 for(int index=0;index<MAX_KEY;index++){ %;\2QI`R  
  if(hCallWnd[index]==0){ dQ2i{A"BKz  
   hCallWnd[index]=hWnd; 1wH/#K  
   HotKey[index]=cKey; HU.6L 'H*  
   HotKeyMask[index]=cMask; gCBZA;/  
   bAdded=TRUE; Uc%`? +Q  
   KeyCount++; }?ac<> u&  
   break; M6>\R$  
  } /-<m(72wF  
 } n*8RYm)?  
 return bAdded; gQzJ2LU(  
} 0_xcrM  
//删除热键 :92a34  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~4 xBa:*z  
{ (k HQKQmq  
 BOOL bRemoved=FALSE; 9QM"JEu@  
 for(int index=0;index<MAX_KEY;index++){ :Tl6:=B  
  if(hCallWnd[index]==hWnd){  sCf(h  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }JTgj  
    hCallWnd[index]=NULL; .^+$w $  
    HotKey[index]=0; 2W-NCE%K)T  
    HotKeyMask[index]=0; ^}pREe c=  
    bRemoved=TRUE; EpS8,[w  
    KeyCount--; >~bj7M6t  
    break; gZ%O<XO  
   } z(#hL-{c  
  }  #,9TJ:~N  
 } 7J_f/st  
 return bRemoved; YNQ6(HA  
} j!8+|eA kk  
{,mRMDEy  
~X(xa  
  DLL中的钩子函数如下: w!9WCl]9M  
k^%ec3l  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)  ,8 NEnB  
{ l$~bkVNL  
 BOOL bProcessed=FALSE; kx#L<   
 if(HC_ACTION==nCode) OU3+SYM  
 { {zN_l!  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 U&\{/l  
   switch(wParam) qA\kx#v]P  
   {  5qB=@O]|G;  
    case VK_MENU: C- Rie[  
     MaskBits&=~ALTBIT; qN,FX#DP  
     break; vgp%;-p(  
    case VK_CONTROL: ^E?V+3mV  
     MaskBits&=~CTRLBIT; "9T`3cM0  
     break; U4I` xw'  
    case VK_SHIFT: Oqe.t;E 0}  
     MaskBits&=~SHIFTBIT; =Bqa <Js  
     break; r%mTOLef  
    default: //judge the key and send message B91PlM.  
     break; G+^$JN=  
   } |Ie`L("  
   for(int index=0;index<MAX_KEY;index++){ hBSJEP  
    if(hCallWnd[index]==NULL) scEQDV  
     continue; r{jD,x2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) e(% Solkm?  
    { 1Moh`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,%G2>PBt  
     bProcessed=TRUE; LsZ!':LN  
    } 3kQ8*S  
   } X35U!1Y\  
  } #]/T9:  
  else if((lParam&0xc000ffff)==1){ //有键按下 Ca"+t lO  
   switch(wParam) S&) >w5*]U  
   { g*imswj7  
    case VK_MENU: R2ZQBwB  
     MaskBits|=ALTBIT; Yf`.Cq_:  
     break; D ;I;,Z  
    case VK_CONTROL: __%E!*m"<_  
     MaskBits|=CTRLBIT; \k-juF80  
     break; iC2nHZ*,  
    case VK_SHIFT: z(68^-V=:  
     MaskBits|=SHIFTBIT; Ui;s.f  
     break; 5&Kn #  
    default: //judge the key and send message E }j8p_p  
     break; V/%;:u l.  
   } ryLNMh  
   for(int index=0;index<MAX_KEY;index++){ |^{" 2l"j  
    if(hCallWnd[index]==NULL) u(`A?H:  
     continue; O!Cu.9}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RteTz_ z{  
    { |Cq J2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); eH*b -H[  
     bProcessed=TRUE; `bF;Ew;  
    } =_6h{f&Q  
   } ?O Nw*"9  
  } rM.<Gi05Qe  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 cHct|Z u  
   for(int index=0;index<MAX_KEY;index++){ )Dpt<}}\  
    if(hCallWnd[index]==NULL) ^{bEq\5&  
     continue; [ [CXMbD`*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) o_m.MMEU  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); g$LwXfg  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 &JM;jS z  
   } }Cg~::,"  
  } k(+u"T  
 } )B4c;O4t  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); =nZd"t'p|  
} CxQ,yd;>  
Khd,|pM  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:  Bz~h-  
J :(\o=5 5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); FWN%JCOj@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); N\&;R$[9:  
,^C;1ph  
  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: xhS/X3<th  
~riw7"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Ih"Ol(W  
{ - Sgp,"a  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) rcT<OiYuig  
 { TvwIro  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 :!h H`l}p  
  SaveBmp(); !S{<Xc'wv  
  return FALSE; !WnI`  
 } ji=po;g=E  
 …… //其它处理及默认处理 z59J=?|  
} ~-i?=  
*4y r7~S5  
tpK4 gjf  
  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。 #ySx$WT;  
Z+7S,M  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 [.,6~=}vP  
0VPa;{i/  
  二、编程步骤 zy;w07-)  
u;}B4Rx  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; S}O\<6&  
u)pBFs<dn  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; o#6}?g.  
}iAi`_\0;  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; sAlgp2-  
ztpb/9J9  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; k]g\` gc  
k({8C`&tK/  
  5、 添加代码,编译运行程序。 ,cEcMaJ  
UC@"<$'C  
三、程序代码 `_`,XkpzCJ  
ic#drpl,  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL @eWx4bl  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) i-b7  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ )`-]nMc  
#if _MSC_VER > 1000 $)V4Eu;  
#pragma once -2_$zk*n  
#endif // _MSC_VER > 1000 zPYa@0I  
#ifndef __AFXWIN_H__ ?2;G_P+  
#error include 'stdafx.h' before including this file for PCH )I4tl/  
#endif rkl7p?  
#include "resource.h" // main symbols UtrbkuT  
class CHookApp : public CWinApp 06$9Uz9  
{ P0=F9`3wb  
 public: h@d m:=ul  
  CHookApp(); = xk@Q7$  
  // Overrides 5WYU&8+]{:  
  // ClassWizard generated virtual function overrides DM95Il[/  
  //{{AFX_VIRTUAL(CHookApp) uX[ "w|  
 public: Q<pM tW  
  virtual BOOL InitInstance(); k~ue^^r}  
  virtual int ExitInstance(); %?jf.p*kY  
  //}}AFX_VIRTUAL kz^G.5n   
  //{{AFX_MSG(CHookApp) rge/jE,^~Z  
  // NOTE - the ClassWizard will add and remove member functions here. %*nZ,r  
  // DO NOT EDIT what you see in these blocks of generated code ! y]_DW6W  
  //}}AFX_MSG p'*UM%@SIY  
  DECLARE_MESSAGE_MAP() 9iE66N>z  
}; :83" t-O8[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); r "R\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); D~:fn|/Brp  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); s-B\8&^C  
BOOL InitHotkey(); X'm2uOEj  
BOOL UnInit(); x?IT#ty  
#endif *&D=]fG  
-E7\ .K3  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 25L{bcng  
#include "stdafx.h" lLhCk>a  
#include "hook.h" %Y TIS*+0  
#include <windowsx.h> wah`  
#ifdef _DEBUG Up&q#vqIj  
#define new DEBUG_NEW /v[- KjTj7  
#undef THIS_FILE :w+Rs+R  
static char THIS_FILE[] = __FILE__; _c2#  
#endif ;l'I. j  
#define MAX_KEY 100 o[ 6hUX0tN  
#define CTRLBIT 0x04 l ;uEw  
#define ALTBIT 0x02 d9(FwmE  
#define SHIFTBIT 0x01 zBbTj IFQ  
#pragma data_seg("shareddata") ?*4zNhL  
HHOOK hHook =NULL; "^H+A-R[  
UINT nHookCount =0; zjmc>++<t  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey xcig'4L  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT v6:DA#0  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey u#\3T>o%@  
static int KeyCount =0; $$@Tgkg?o  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ? &O$ayG77  
#pragma data_seg() |}; ~YMH  
HINSTANCE hins; 5h1j.t!  
void VerifyWindow(); Gm. hBNgp  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) (`xc3-,  
//{{AFX_MSG_MAP(CHookApp) qU}DOL|  
// NOTE - the ClassWizard will add and remove mapping macros here. CS/-:>s%  
// DO NOT EDIT what you see in these blocks of generated code! =%L^!//c  
//}}AFX_MSG_MAP d,77L  
END_MESSAGE_MAP() O,cx9N  
W5p}oN  
CHookApp::CHookApp() =EKJ!{  
{ DQ)SMqOotw  
 // TODO: add construction code here, c nzPq\  
 // Place all significant initialization in InitInstance oC [g  
} u2t<auE9^  
R|suBF3  
CHookApp theApp; jhLh~. 8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) D&shrKFx  
{ m{*l6`dF  
 BOOL bProcessed=FALSE; VxCH}&!  
 if(HC_ACTION==nCode) 9c6=[3)V  
 { ,J|};s+  
  if((lParam&0xc0000000)==0xc0000000){// Key up HZT;7<  
   switch(wParam) 4v>V7T.  
   { g@Zc'g/XB  
    case VK_MENU: (GQy"IuFh  
     MaskBits&=~ALTBIT; ?vVkZsU  
     break; ;VuIQ*@m"  
    case VK_CONTROL: <R2  
     MaskBits&=~CTRLBIT; Y'-Lt5SCS  
     break; Q%7EC>V  
    case VK_SHIFT: 4M _83WL  
     MaskBits&=~SHIFTBIT; $3L7R  
     break; lwU&jo*@  
    default: //judge the key and send message 7,1idY%cy  
     break; [Ue>KG62=  
   } 4Qd g t*  
   for(int index=0;index<MAX_KEY;index++){ 3 yElN.=  
    if(hCallWnd[index]==NULL) zE[c$KPP  
     continue; N(9'U0z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k2=uP8  
    { \; 3r  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); L,WK L.  
     bProcessed=TRUE; =4zsAa  
    } BWs\'B  
   } rLwc=(|  
  } ; H3kb +  
  else if((lParam&0xc000ffff)==1){ //Key down d|TIrlA  
   switch(wParam) UW+I 8\^  
   { 8X%;29tow  
    case VK_MENU: C?O{l%0  
     MaskBits|=ALTBIT; E8xXr>j>#  
     break; NB^.$ 3 9n  
    case VK_CONTROL: J=$v+8&.  
     MaskBits|=CTRLBIT; sJr$[?  
     break; C>+UZ  
    case VK_SHIFT: 3 !,%;Vz=  
     MaskBits|=SHIFTBIT; {\V)bizY;  
     break; DirWe  
    default: //judge the key and send message 9xWrz;tzo  
     break; , ?%`Ky/  
   } yaf2+zV*  
   for(int index=0;index<MAX_KEY;index++) b &JPLUr  
   { gFKQm(0g2  
    if(hCallWnd[index]==NULL) VYF4q9  
     continue; p;@PfhEz)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rN}^^9  
    { /90@ 85%r  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); TC2aD&cw{  
     bProcessed=TRUE; 5}m2D='  
    } 8]Pf:_e,+  
   } '1w<<?vX?  
  } u&qdrKx  
  if(!bProcessed){ \z_@.Jw{  
   for(int index=0;index<MAX_KEY;index++){ >$?Z&7Lv  
    if(hCallWnd[index]==NULL) L+,{*Uj[;  
     continue; MT9a1 >  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) C{c (K!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); :70oO}0m.  
   } u4S3NLG)  
  } dlW w=^  
 } D1w_Vpz  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :>,d$f^tqE  
} M6e"4Gh  
H1l' \  
BOOL InitHotkey() Ki'EO$  
{ @1>83-p"X  
 if(hHook!=NULL){ 34oC285yc  
  nHookCount++; oreS u;`$  
  return TRUE; cZwQ{9>  
 } D^A_0@  
 else ZFRKh:|  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); |m=@;B|  
  if(hHook!=NULL) 6G( k{S  
   nHookCount++;  "u%$`*  
  return (hHook!=NULL); I*#~@:4*  
} pG" 4qw  
BOOL UnInit() Ad"::&&Wk  
{ $)'{+1  
 if(nHookCount>1){ vOqYt42  
  nHookCount--; ^iGIF~J9  
  return TRUE; GxvVh71zP  
 } @}FRiPo6  
 BOOL unhooked = UnhookWindowsHookEx(hHook); HloP NE&}  
 if(unhooked==TRUE){ BFMM6-Ve  
  nHookCount=0;  V C.r  
  hHook=NULL; E J 9A 4B  
 } %o?fE4o'  
 return unhooked; v!x=fjr<  
} o$Jk2 7  
/O8'8sL5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ue`F|  
{ uZqo"  
 BOOL bAdded=FALSE; x$Lt?'  
 for(int index=0;index<MAX_KEY;index++){ <cl$?].RE!  
  if(hCallWnd[index]==0){ ]AN)M>  
   hCallWnd[index]=hWnd; _]<]:b  
   HotKey[index]=cKey; A$-{WN.W  
   HotKeyMask[index]=cMask;  Pg`^EJ+  
   bAdded=TRUE; EqOB 0\  
   KeyCount++; [*1c.&%(  
   break; o2jnmv~  
  } K46mE   
 } QJv,@@mu  
 return bAdded; B aXzz  
} HVC\(h,)i  
D 0(gEb  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) C&"8A\we  
{ *EotYT  
 BOOL bRemoved=FALSE; r"0nUf*og:  
 for(int index=0;index<MAX_KEY;index++){ Tp9LBF  
  if(hCallWnd[index]==hWnd){ B[k"xs  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ D$j`+`  
    hCallWnd[index]=NULL; T *$uc,  
    HotKey[index]=0; %D&FnTa  
    HotKeyMask[index]=0; /]YK:7*98  
    bRemoved=TRUE; oVLz7Y[JE  
    KeyCount--; 0a(*/u  
    break; {xOu*8J  
   } mhcJ0\@_  
  } <1hwXo  
 } ntjUnd&v\  
 return bRemoved; +[cm  
}  R,y8~D  
SBYRN##n_  
void VerifyWindow() /R^!~J50  
{ s$RymM  
 for(int i=0;i<MAX_KEY;i++){ 6jKM,%l  
  if(hCallWnd!=NULL){ 3Hq0\Y"Y  
   if(!IsWindow(hCallWnd)){ n:7=z0 s  
    hCallWnd=NULL; 3lKIEPf6r  
    HotKey=0; ~)()PO  
    HotKeyMask=0; )hn,rmn (P  
    KeyCount--; !'+t)h9^  
   } )`g[k" yB3  
  } &*0!${ B  
 } of(Nq@  
} [TNYPA> {  
[t ^|l?  
BOOL CHookApp::InitInstance() `5>IvrzXrK  
{ JhuK W>7  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); "+| >nA=7  
 hins=AfxGetInstanceHandle(); 4h(aTbHaQ  
 InitHotkey(); >q]r)~8F^  
 return CWinApp::InitInstance(); NMOTWA }2  
} Gk!v-h9cq  
;7qk9rz4  
int CHookApp::ExitInstance() k5<lkC2z  
{ {VI%]n{M  
 VerifyWindow(); 5Lue.U%a  
 UnInit(); 8l?]UFM>C  
 return CWinApp::ExitInstance(); b#$:XS  
} 4$_8#w B1&  
'o5[ :=K  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file LxMOs Nv  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_)  gs9f2t  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ GF k?Qf{u  
#if _MSC_VER > 1000 gAR];(*  
#pragma once mTcLocx  
#endif // _MSC_VER > 1000 y*zZ }>  
n+xM))  
class CCaptureDlg : public CDialog pKp#4Js  
{ L!{^^7  
 // Construction %S@XY3jZY  
 public: 9WBDSx_(Q  
  BOOL bTray; |z5olu$gVc  
  BOOL bRegistered; VM-J^  
  BOOL RegisterHotkey(); M`"2;  
  UCHAR cKey; W>+<r9Rt4  
  UCHAR cMask; c5U1N&k5&  
  void DeleteIcon(); R4{}ZT  
  void AddIcon(); 1a%*X UT  
  UINT nCount; I\4 I,ds  
  void SaveBmp(); ti'OjoJL  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor &M<431y  
  // Dialog Data 1f~_# EIC  
  //{{AFX_DATA(CCaptureDlg) `7'(U)x,F  
  enum { IDD = IDD_CAPTURE_DIALOG }; 9#_49euy|P  
  CComboBox m_Key; QI!:+8  
  BOOL m_bControl; #`?uV)(  
  BOOL m_bAlt; ;M}bQ88  
  BOOL m_bShift; .%D] z{''  
  CString m_Path; FSH6C2  
  CString m_Number; J,jl(=G  
  //}}AFX_DATA u,&Z5S  
  // ClassWizard generated virtual function overrides W+Iln`L  
  //{{AFX_VIRTUAL(CCaptureDlg) @Wdnc/o]  
 public: Z#\ \NfR  
  virtual BOOL PreTranslateMessage(MSG* pMsg); # VR}6Jv  
 protected: `GH6$\:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ncihc$V<  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); >o(*jZ  
  //}}AFX_VIRTUAL CuDU~)`  
  // Implementation SR8[ 7MU  
 protected: 1OJ:Vy}n  
  HICON m_hIcon; {_Wtk@  
  // Generated message map functions ab 2 V.S  
  //{{AFX_MSG(CCaptureDlg) mQ1QJ_;  
  virtual BOOL OnInitDialog(); d{DlW |_  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); [rGR1>U?i  
  afx_msg void OnPaint(); *mBn''a"*  
  afx_msg HCURSOR OnQueryDragIcon(); !a1jc_  
  virtual void OnCancel(); ]%NCKOM  
  afx_msg void OnAbout(); $z` jR*  
  afx_msg void OnBrowse(); t+66kBN  
  afx_msg void OnChange(); J&h 3,  
 //}}AFX_MSG k \]@  
 DECLARE_MESSAGE_MAP() 7rsrC  
}; "%0RR?  
#endif R(x% <I  
]_#[o S  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 0z\=uQ0  
#include "stdafx.h" bx`(d@  
#include "Capture.h" 40+E#z)  
#include "CaptureDlg.h" 48w3gye  
#include <windowsx.h> m@"!=CTKd  
#pragma comment(lib,"hook.lib") 1eK J46W  
#ifdef _DEBUG \QYs(nm?k  
#define new DEBUG_NEW yKq;EcVx  
#undef THIS_FILE $^`hu%s,~  
static char THIS_FILE[] = __FILE__; #Etz}:%W  
#endif Jb_/c``  
#define IDM_SHELL WM_USER+1 !07$aQYcd  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); e3',? 5j  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "BEU%,w  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; C%G-Ye|@  
class CAboutDlg : public CDialog W5sVQ`S-  
{ P]INYH  
 public: >YPfk=0f0  
  CAboutDlg(); >oLM2VJ  
  // Dialog Data c-`&e-~XKL  
  //{{AFX_DATA(CAboutDlg) 4|x5-m+T  
  enum { IDD = IDD_ABOUTBOX }; >iaZGXje  
  //}}AFX_DATA hLO nX<%a  
  // ClassWizard generated virtual function overrides ]_5C5m  
  //{{AFX_VIRTUAL(CAboutDlg) jj.)$|&#`  
 protected: d0 |Q1R+3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support D*_ F@}=  
  //}}AFX_VIRTUAL /l@7MxE  
  // Implementation Jg: Uv6eN+  
 protected: >uxak2nM-  
  //{{AFX_MSG(CAboutDlg) vzy/Rq  
  //}}AFX_MSG IHf A;&b  
  DECLARE_MESSAGE_MAP() -3ha LdRk6  
}; XBi@\i=  
A9F&XF7{  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) &>sG x K  
{ Jtc?p{  
 //{{AFX_DATA_INIT(CAboutDlg) h]G }E9\l  
 //}}AFX_DATA_INIT vFy /  
} R"K{@8b  
(9'MdH  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Zni8 im,_j  
{ W._vikR  
 CDialog::DoDataExchange(pDX); (S1$g ~t;  
 //{{AFX_DATA_MAP(CAboutDlg) m_U__CZ}Tt  
 //}}AFX_DATA_MAP g'hBs D1'  
} -%"MAIJnX  
8={(Vf6  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) <K|_M)/9  
 //{{AFX_MSG_MAP(CAboutDlg) | u36-  
 // No message handlers :|P"`j  
 //}}AFX_MSG_MAP 3^ wJ4=^  
END_MESSAGE_MAP() 6lsU/`.  
SlsMMD  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) k' pu%nWN  
: CDialog(CCaptureDlg::IDD, pParent) h&.9Q{D  
{ `7+?1 z  
 //{{AFX_DATA_INIT(CCaptureDlg) vy6NH5Q  
  m_bControl = FALSE; aRj3TtFh  
  m_bAlt = FALSE; rJD>]3D5p  
  m_bShift = FALSE; u~% m(  
  m_Path = _T("c:\\"); T?E2;j0h'#  
  m_Number = _T("0 picture captured."); TY~0UU$  
  nCount=0; a]$KI$)e  
  bRegistered=FALSE; T%- F,i  
  bTray=FALSE; Hq6VwQu?  
 //}}AFX_DATA_INIT Wf>UI)^n  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 x&8fmUS:@;  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 2.?:[1g!  
} UV@<55)K  
?RrJYj1  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?9 2+(s  
{ Y~gpiL3u  
 CDialog::DoDataExchange(pDX); K\=bpc"Fy  
 //{{AFX_DATA_MAP(CCaptureDlg) bbS'ZkB\  
  DDX_Control(pDX, IDC_KEY, m_Key); eBtkTWx5[/  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); u[fQvdl  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Cg8{NNeD  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Oj~k1+*  
  DDX_Text(pDX, IDC_PATH, m_Path); @q[-,EA9  
  DDX_Text(pDX, IDC_NUMBER, m_Number); KiH#*u S  
 //}}AFX_DATA_MAP $F;$-2  
} d ID] {  
K.*zqQKlI|  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) *s;$`8fM<  
//{{AFX_MSG_MAP(CCaptureDlg) 024*IoVZ  
 ON_WM_SYSCOMMAND() c$@,*c 0n  
 ON_WM_PAINT() nr-VzF7zu  
 ON_WM_QUERYDRAGICON() cidS/OH  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) -&@[]/  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) eHd{'J<  
 ON_BN_CLICKED(ID_CHANGE, OnChange) q{n~s=  
//}}AFX_MSG_MAP hTH"jAC+  
END_MESSAGE_MAP() ?AYI   
 ,Ad\!  
BOOL CCaptureDlg::OnInitDialog() $aG]V-M>  
{ nolTvqMT  
 CDialog::OnInitDialog(); 3J%jD  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); T|ZT&x$z  
 ASSERT(IDM_ABOUTBOX < 0xF000); ~F uD6f  
 CMenu* pSysMenu = GetSystemMenu(FALSE); N~Ax78TX  
 if (pSysMenu != NULL) 4$SW~BpQ  
 { ]:m*7p\uk  
  CString strAboutMenu; efZdtrKgy  
  strAboutMenu.LoadString(IDS_ABOUTBOX); JI@~FD&  
  if (!strAboutMenu.IsEmpty()) tj{rSg7{  
  { sfa T`q  
   pSysMenu->AppendMenu(MF_SEPARATOR); ~O |j*T  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); +- c#UO>  
  } qt/"$6]%  
 } <$,i Yx   
 SetIcon(m_hIcon, TRUE); // Set big icon 8t9sdqM/C  
 SetIcon(m_hIcon, FALSE); // Set small icon \`|,wLgH  
 m_Key.SetCurSel(0); r(%#@?&  
 RegisterHotkey(); ax7u b  
 CMenu* pMenu=GetSystemMenu(FALSE); ft:/-$&H  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); WNlWigwYl  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); LPewoAXO  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); hFylQfd  
 return TRUE; // return TRUE unless you set the focus to a control "R4~ 8r  
} $N:m 9R  
8Bo'0  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) _S@s  
{ dpGaI  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Hagj^8  
 { P8z+ +h  
  CAboutDlg dlgAbout; c\]h YKA  
  dlgAbout.DoModal(); 89+m?H]K  
 } 9FH=Jp  
 else 93[`1_q7\  
 { LOR$d^l  
  CDialog::OnSysCommand(nID, lParam); ^Q2K0'm5  
 } ?HZ+fS ,-  
} :%!=Ej.J  
~A>3k2 N/e  
void CCaptureDlg::OnPaint() >:KPvq!0  
{ dRas9g  
 if (IsIconic()) }[D[ZLv  
 { NVJvCs)3f  
  CPaintDC dc(this); // device context for painting "AUY+ LN  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); _pjpPSV6J  
  // Center icon in client rectangle s:wLEj+  
  int cxIcon = GetSystemMetrics(SM_CXICON); cg$7`/U  
  int cyIcon = GetSystemMetrics(SM_CYICON); #HM0s~^w&  
  CRect rect; [u,B8DX  
  GetClientRect(&rect); j"}alS`-  
  int x = (rect.Width() - cxIcon + 1) / 2; AP/tBC eM  
  int y = (rect.Height() - cyIcon + 1) / 2; wjKW 3  
  // Draw the icon )5'S=av9  
  dc.DrawIcon(x, y, m_hIcon); l$)pCo  
 } &eK8v]|"W  
 else jO!!. w  
 { y4 P mL  
  CDialog::OnPaint(); j~Rh_\>Q  
 } 6i{W=$ RQ  
} aHwrFkn  
Ms^,]Q1{  
HCURSOR CCaptureDlg::OnQueryDragIcon() 3u+~!yz  
{ {jggiMwo.v  
 return (HCURSOR) m_hIcon;  1=W>zC  
} W#-M|  
0^:O:X  
void CCaptureDlg::OnCancel() &ATjDbW*(  
{ }g>&l.2X  
 if(bTray) ]>*Z 1g;  
  DeleteIcon(); =GFlaGD  
  CDialog::OnCancel(); |w:7).P  
} ]U'KYrh  
DQKhR sC  
void CCaptureDlg::OnAbout() LD]XN'?"W  
{ gd/W8*NFR  
 CAboutDlg dlg; l,,5OZw  
 dlg.DoModal(); !3?HpR/nV  
} >E[cl\5$E  
@Je{;1   
void CCaptureDlg::OnBrowse() 2l8jw:=H  
{ bWjW_$8  
 CString str; ,#D &*  
 BROWSEINFO bi; d}ue/hdw  
 char name[MAX_PATH]; @ ;rU#  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /v=MGX@r  
 bi.hwndOwner=GetSafeHwnd(); A!goR-J]  
 bi.pszDisplayName=name; M^k~w{   
 bi.lpszTitle="Select folder"; 70*Y4'u }A  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; (MwB% g  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Q6"r^w Wx  
 if(idl==NULL) I9k o*f  
  return; b[$l{RQ[?  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); bBC3% H^  
 str.ReleaseBuffer(); 3ef]3  
 m_Path=str; 8;Yx a8ie  
 if(str.GetAt(str.GetLength()-1)!='\\') pPeS4$Y  
  m_Path+="\\"; F4Z+)'oDr,  
 UpdateData(FALSE); LUw0MW(Moi  
} ~{RXc+  
L[Tr"BW  
void CCaptureDlg::SaveBmp() ?w /tq!  
{ SP5/K3t-*  
 CDC dc; U1J?o #(  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ks:Z=%o   
 CBitmap bm; m_' 1yX@  
 int Width=GetSystemMetrics(SM_CXSCREEN); AdR}{:ia  
 int Height=GetSystemMetrics(SM_CYSCREEN); o}Dy\UfU  
 bm.CreateCompatibleBitmap(&dc,Width,Height); RzFv``g  
 CDC tdc; O6l j^  
 tdc.CreateCompatibleDC(&dc); DoNbCVZ  
 CBitmap*pOld=tdc.SelectObject(&bm); G|IO~o0+  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); I:bi8D6  
 tdc.SelectObject(pOld); vezX/xD?  
 BITMAP btm; ^5j9WV  
 bm.GetBitmap(&btm); |c dQJW  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; $WrDZU 2z  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); NR^z!+oSR  
 BITMAPINFOHEADER bih; T+N%KRl  
 bih.biBitCount=btm.bmBitsPixel; V 7%rKK  
 bih.biClrImportant=0; 97'*Xq  
 bih.biClrUsed=0; V= !!;KR0  
 bih.biCompression=0; | u7vY/  
 bih.biHeight=btm.bmHeight; `NyvJt^<  
 bih.biPlanes=1; _ z{:Q  
 bih.biSize=sizeof(BITMAPINFOHEADER); +hV7o!WxC  
 bih.biSizeImage=size; 56d,Sk)  
 bih.biWidth=btm.bmWidth; $>]7NTP  
 bih.biXPelsPerMeter=0; bC)d iC  
 bih.biYPelsPerMeter=0; 1+.(N:) +  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); "qR qEpD%  
 static int filecount=0; "4oY F:h  
 CString name; Ej8EQ% P  
 name.Format("pict%04d.bmp",filecount++); >&Y8VLcK  
 name=m_Path+name; (lTM^3 }  
 BITMAPFILEHEADER bfh; GC~Tfrf=r  
 bfh.bfReserved1=bfh.bfReserved2=0; Qc Ia%lf  
 bfh.bfType=((WORD)('M'<< 8)|'B'); [|Jz s[  
 bfh.bfSize=54+size; @/E5$mX`  
 bfh.bfOffBits=54; YRAWylm  
 CFile bf; e>z3 \4  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ pDrM8)r  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ORyFE:p$  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); H '&x4[J:  
  bf.WriteHuge(lpData,size); >N{K)a  
  bf.Close(); j#Bea ,  
  nCount++; +8v^J8q0  
 } ^e8~eL+  
 GlobalFreePtr(lpData); ` SZ^~O  
 if(nCount==1) j%#n}H  
  m_Number.Format("%d picture captured.",nCount); <p-R{}8  
 else E+]gC  
  m_Number.Format("%d pictures captured.",nCount); `N]!-=o  
  UpdateData(FALSE); u-f_,],p  
} al(t-3`<  
E[)`+:G]  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Z Z\,iT  
{ I+kDx=T !  
 if(pMsg -> message == WM_KEYDOWN) %q`_vtUT  
 { g3Xq@RAJc  
  if(pMsg -> wParam == VK_ESCAPE) BD\xUjd?)Q  
   return TRUE; TmvI+AY/  
  if(pMsg -> wParam == VK_RETURN) sas;<yh  
   return TRUE; - b:&ACY  
 } B9&"/tT  
 return CDialog::PreTranslateMessage(pMsg); 9~SfZ,(  
} ~(~fuDT~O  
=*~]lz__M  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) B|/=E470G  
{ cX 9 !a,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 4 B"tz!  
  SaveBmp(); &CV%+  
  return FALSE; wm%9>mA%  
}  ?; ZTJ  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ z v*hA/  
 CMenu pop; J/:9;{R  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Pa 'g=-  
 CMenu*pMenu=pop.GetSubMenu(0); Rs$k3   
 pMenu->SetDefaultItem(ID_EXITICON); "\Zsr6y  
 CPoint pt; 4nN%5c~=  
 GetCursorPos(&pt); 9r+]V=  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 3<88j&9  
 if(id==ID_EXITICON) KnaQhZ  
  DeleteIcon(); )[.FUx  
 else if(id==ID_EXIT) jSsbLa@  
  OnCancel(); G&I\Za;   
 return FALSE; C4 H M  
} y)0r%=  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); vUk <z*  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 5A g 4o  
 AddIcon(); [y7BHikX)  
 return res; !_3R dS  
} zYvf}L&]h  
8$xd;+`y'  
void CCaptureDlg::AddIcon() mJ2>#j;5f  
{ Y;O\ >o[  
 NOTIFYICONDATA data; N,0l5fD~T  
 data.cbSize=sizeof(NOTIFYICONDATA); kAsYh4[  
 CString tip; P:eY>~m<;  
 tip.LoadString(IDS_ICONTIP); q"7rd?r52  
 data.hIcon=GetIcon(0); D(yU:^L  
 data.hWnd=GetSafeHwnd(); PHU#$LG  
 strcpy(data.szTip,tip); bS=aFl#  
 data.uCallbackMessage=IDM_SHELL; ] lE6:^V  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 0>} FNRC  
 data.uID=98; h:\WW;s[B  
 Shell_NotifyIcon(NIM_ADD,&data); dO =fbmK  
 ShowWindow(SW_HIDE); u[5*RTE  
 bTray=TRUE; TcPYDAa  
} 5V;BimI  
)kfj+/  
void CCaptureDlg::DeleteIcon() NokAP|<y  
{ zy"wQPEE  
 NOTIFYICONDATA data; ;m`k#J?  
 data.cbSize=sizeof(NOTIFYICONDATA); uH!uSB2  
 data.hWnd=GetSafeHwnd(); JKN0:/t7 Q  
 data.uID=98; klmRU@D  
 Shell_NotifyIcon(NIM_DELETE,&data); =~}\g;K1Q  
 ShowWindow(SW_SHOW); xdGmiHN  
 SetForegroundWindow(); A\nL(Nd  
 ShowWindow(SW_SHOWNORMAL); ;.>CDt-E]  
 bTray=FALSE; r%\(5H f  
} $ lz\t e  
9|R]Lz3PA  
void CCaptureDlg::OnChange() -LI^(_  
{ N/IDj2C4  
 RegisterHotkey(); CV&+^_j'k  
} s ~c_9,JK  
FRqJ#yd]  
BOOL CCaptureDlg::RegisterHotkey() do@`(f3 g  
{ fG_.&!P  
 UpdateData(); hfw$820y[  
 UCHAR mask=0; \Jq$!foYx  
 UCHAR key=0; ^x8*]Sz#x  
 if(m_bControl) }q7rR:g  
  mask|=4; ;;#28nV  
 if(m_bAlt) WsO'4~X9  
  mask|=2; E:'TZ4Z  
 if(m_bShift) nQm7At  
  mask|=1; KKB&)R  
  key=Key_Table[m_Key.GetCurSel()]; *S,5  
 if(bRegistered){ mux_S2x9m\  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); nW#UBtZ  
  bRegistered=FALSE; *-0tj~)>  
 } H <7r  
 cMask=mask;  ntK#7(U'  
 cKey=key; 0wL-Ak#v  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 6^_:N1 @  
 return bRegistered; T:k-`t0":N  
} /<ODP6Yy;  
GxjmHo  
  四、小结 BSU%.tmI  
8ExEhBX8  
  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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