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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: t>cGfA  
  QnVr)4"  
  一、实现方法 p@G7}'|eyA  
nU_O|l9  
  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: -Ty~lZ)TDT  
OtqFI!ns  
#pragma data_seg("shareddata") {3`385  
HHOOK hHook =NULL; //钩子句柄 4=tR_s  
UINT nHookCount =0; //挂接的程序数目 mcez3gH  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码  JaY"Wfc  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 geR+v+B,  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey &Pr\n&9A  
static int KeyCount =0; Zigv;}#  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 :82h GU  
#pragma data_seg() 2 DW @}[G  
xrkl)7;  
  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。 B}d&tH2^s  
}'x;J   
  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: Kn~Rck| ]  
Zl5'%b$&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR bGWfMu=n  
cKey,UCHAR cMask) hN'])[+V  
{ _f[Q\gK  
 BOOL bAdded=FALSE; XH!#_jy  
 for(int index=0;index<MAX_KEY;index++){ p' >i3T(  
  if(hCallWnd[index]==0){ .ImaM  
   hCallWnd[index]=hWnd; [7v|bd  
   HotKey[index]=cKey; 1/Ts .\K3  
   HotKeyMask[index]=cMask; rz"$zc.)  
   bAdded=TRUE; B`}um;T#~,  
   KeyCount++; P'Rw/c o  
   break; h+g\tYWGP  
  } v(2N@s <%  
 } J3_aHI  
 return bAdded; nQc#AFg  
} @yuiNj .T  
//删除热键 O]u'7nO{{  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "Q.*  
{ S!b18|o"  
 BOOL bRemoved=FALSE; ~18a&T:  
 for(int index=0;index<MAX_KEY;index++){ Z4VFfGCTL  
  if(hCallWnd[index]==hWnd){ T0w_d_aS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ lxL5Rit@Px  
    hCallWnd[index]=NULL; 8?+|4:#=*J  
    HotKey[index]=0; .Fn|Okn^gr  
    HotKeyMask[index]=0; hk~/W}sI  
    bRemoved=TRUE; >aVgI<  
    KeyCount--; ]b4IO4T  
    break; 7QsD"rL  
   } @gI1:-chB  
  } fM;,9  
 } ;/K2h_=3z  
 return bRemoved; zU?O)w1'  
} 7PY$=L48A  
2zTi/&K&  
<sH}X$/  
  DLL中的钩子函数如下: !$Nj!  
9-ozrw8t  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) bU! v  
{ ?"d$SK"6Z  
 BOOL bProcessed=FALSE; IP62|~Ap  
 if(HC_ACTION==nCode) YQ+hQ:4-  
 { "}]$ag!`q$  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 &~,4$& _  
   switch(wParam) C%XO|sP  
   {  /v R>.'  
    case VK_MENU: gfQ?k  
     MaskBits&=~ALTBIT; W$c@C02<  
     break; U[C4!k:0  
    case VK_CONTROL: Mkz_.;3  
     MaskBits&=~CTRLBIT; Lzq/^&sc(  
     break; II\&)_S.4  
    case VK_SHIFT: >d/H4;8  
     MaskBits&=~SHIFTBIT; Gnkar[oa&  
     break; OR <+y~Rv  
    default: //judge the key and send message (@1:1K(   
     break; 6CY&pbR  
   } k +-w%  
   for(int index=0;index<MAX_KEY;index++){ _[2@2q0  
    if(hCallWnd[index]==NULL) g$nS6w|5H  
     continue; 5'lPXKn+L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~G!JqdKJ0  
    { YlHP:ZW-cu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $coO~qvU  
     bProcessed=TRUE; X,QsE{  
    } ZwmucY%3  
   } -#|D>  
  } NQ9v[gv  
  else if((lParam&0xc000ffff)==1){ //有键按下 k ka5=u  
   switch(wParam) H9cPtP~a)  
   { [^5\Ww  
    case VK_MENU: fj_23{,/"g  
     MaskBits|=ALTBIT; +hxG!o?O  
     break; ZitM<Qi&y  
    case VK_CONTROL: /DYyl/  
     MaskBits|=CTRLBIT; !J`lA  
     break; ZaFt4#  
    case VK_SHIFT: 2B,O/3y  
     MaskBits|=SHIFTBIT; Ed9Uw 7  
     break; /A=w`[<  
    default: //judge the key and send message 6%v9o?:~l  
     break; @R[{  
   } JB_fS/I  
   for(int index=0;index<MAX_KEY;index++){ /).{h'^Hq\  
    if(hCallWnd[index]==NULL) R?{+&r.X  
     continue; CKsVs.:u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -pC8 L<  
    { 7{;it uqX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ?"B] "%M&  
     bProcessed=TRUE; @YJI'Hf67  
    } :D.0\.p  
   } =*mT{q@  
  } ~ Z\:Nx  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 =6%oW2E\  
   for(int index=0;index<MAX_KEY;index++){ 22\!Z2@T/  
    if(hCallWnd[index]==NULL) R@vcS=m7  
     continue; E[H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) FKa";f"  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); X\|!  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 {Cx5m   
   } xUo6~9s7  
  } k:@DK9 "^  
 } ?e7]U*jEU  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); a)qan  
} o5 L^  
F@w; .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: MY&Jdmga  
25^?|9o7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  <wH+\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p9(y b  
D&@]  
  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: \/A.j|by,>  
4=zs&   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) KpLmpK1  
{ U.%Kt,qB  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) yIMqQSt79z  
 { P]_d;\ !"v  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 2eT?qCxqc  
  SaveBmp(); K1B9t{T  
  return FALSE; MmuT~d/  
 } ^J!q>KJs  
 …… //其它处理及默认处理 bx@l6bpQ  
} V~J5x >O  
qQ&uU7,#  
-yYdj1y;  
  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。  N;7/C  
#(8|9  
  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。 qUe _B  
pSZ2>^";  
  二、编程步骤 @f!X%)\;x  
1>!LK_  
  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"; Cy/&KWLenf  
U|(+-R8Z  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; -N *L1Zj  
EY}:aur  
  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; }aCa2%  
#YUaM<O  
  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; x0*{oP  
M`xiC  
  5、 添加代码,编译运行程序。 q'2vE;z Kb  
EE/mxN(<  
三、程序代码 ny={OhP-  
~E<2gMKjO  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL NkE0S`Xf  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) wT1s;2%  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ k9|5TLXq?  
#if _MSC_VER > 1000 0D X_ *f  
#pragma once .6B\fr.za  
#endif // _MSC_VER > 1000 U)S=JT~h  
#ifndef __AFXWIN_H__ :!ya&o  
#error include 'stdafx.h' before including this file for PCH 2Xb, i  
#endif 6% D9;-N)  
#include "resource.h" // main symbols )G? qX.D  
class CHookApp : public CWinApp ^)VwxH:s  
{ >tD=t8  
 public: aQk&#OQy  
  CHookApp(); IgT`on3Y  
  // Overrides >ZA=9v  
  // ClassWizard generated virtual function overrides bp1AN9~  
  //{{AFX_VIRTUAL(CHookApp) ab0 Sx  
 public: +/:tap|V  
  virtual BOOL InitInstance(); "tK%]c d-  
  virtual int ExitInstance(); #el27"QP0  
  //}}AFX_VIRTUAL iyskADS  
  //{{AFX_MSG(CHookApp) f0<zK !  
  // NOTE - the ClassWizard will add and remove member functions here. md!6@)S-p  
  // DO NOT EDIT what you see in these blocks of generated code ! 1GY2aZ@  
  //}}AFX_MSG boh?Xt-$  
  DECLARE_MESSAGE_MAP() a"8[,A3  
}; sdu?#O+c1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); }`"`VLh  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1^ iBS  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); kc,"w\ ai  
BOOL InitHotkey(); ?b7\m":'  
BOOL UnInit(); 7>JYwU{  
#endif `i7r]  
IThd\#=  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. . ,7bGY 1$  
#include "stdafx.h" R>Ra~ b  
#include "hook.h" n|`3d~9$&  
#include <windowsx.h> _IH" SVub  
#ifdef _DEBUG rg/{5f  
#define new DEBUG_NEW %H{p&ms  
#undef THIS_FILE | HazM9=  
static char THIS_FILE[] = __FILE__; ^0VL](bD>  
#endif ?KT{H( rU  
#define MAX_KEY 100 E?m~DYnU  
#define CTRLBIT 0x04 q76POytV|  
#define ALTBIT 0x02  cby#  
#define SHIFTBIT 0x01 0=d2_YzSf  
#pragma data_seg("shareddata") "S#F I  
HHOOK hHook =NULL; MB plhVK8  
UINT nHookCount =0; Tt;F-  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 7#8Gn=g  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT =x~I'|%3  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey pwUXM?$R  
static int KeyCount =0; eH&F gmU  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift `-NK:;^  
#pragma data_seg() GW2\YU^{  
HINSTANCE hins; !Sq<_TO  
void VerifyWindow(); P rt} 01$  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) K}*ets1s}  
//{{AFX_MSG_MAP(CHookApp) d@%"B($nR  
// NOTE - the ClassWizard will add and remove mapping macros here. bbm\y] !t  
// DO NOT EDIT what you see in these blocks of generated code! 5*0zI\  
//}}AFX_MSG_MAP oy+|:[v:Fk  
END_MESSAGE_MAP() +2uSMr  
)U^=`* 7  
CHookApp::CHookApp() m 2H4V+M+  
{ :qYp%Ub  
 // TODO: add construction code here, ~zp8%lEe  
 // Place all significant initialization in InitInstance -(VJ,)8t2  
} ul{x|R  
^:nc'C gP  
CHookApp theApp; Sn CwoxK  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) : =QX^*  
{ OATdmHW  
 BOOL bProcessed=FALSE; Uj@th  
 if(HC_ACTION==nCode) _=v#"l  
 { +z >)'#  
  if((lParam&0xc0000000)==0xc0000000){// Key up OG\i?N  
   switch(wParam) )0{`}7X  
   { A q i:h]x  
    case VK_MENU: m 0HK1'  
     MaskBits&=~ALTBIT; ~ELY$G.xl  
     break; =w2 4(S  
    case VK_CONTROL: XN<SKW(H3  
     MaskBits&=~CTRLBIT; K+g[E<x\=  
     break; #A63?kDE&&  
    case VK_SHIFT: 8-$t7bV5  
     MaskBits&=~SHIFTBIT; !oLn=  
     break; sJHVnMA  
    default: //judge the key and send message ;m/e|_4;y  
     break; nF3}wCe)  
   } O&%'j  
   for(int index=0;index<MAX_KEY;index++){ r924!zdbR  
    if(hCallWnd[index]==NULL) %L|fTndKH  
     continue; U,<m%C"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) l.YE@EL  
    { HB07 n4 |  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =C %)(|  
     bProcessed=TRUE; CEy\1D  
    } f@*69a8  
   } sqkWQ`Ur  
  } ~uQ*u.wi  
  else if((lParam&0xc000ffff)==1){ //Key down ttP7-y  
   switch(wParam) gt kV=V  
   { ^W |YE72Y  
    case VK_MENU: kUT2/3Vi  
     MaskBits|=ALTBIT; K;K0D@>]HR  
     break; M!&Hn,22  
    case VK_CONTROL: {UNH?2  
     MaskBits|=CTRLBIT; <'Q6\R}:vC  
     break; ]xC56se  
    case VK_SHIFT: TykT(=  
     MaskBits|=SHIFTBIT; &AiAd6  
     break; js$R^P  
    default: //judge the key and send message (qn=BP I  
     break; (* -wiL  
   } /ViY:-8s  
   for(int index=0;index<MAX_KEY;index++) FW]tDGJOw  
   { yi7.9/;a  
    if(hCallWnd[index]==NULL) '|}A /`  
     continue; *A-_*A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )e(<YST  
    { A;AQw  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); i'Y8-})  
     bProcessed=TRUE; =NB[jQ :(  
    } U-|]A\`)I  
   } ly0R'4j \  
  } TrI+F+;  
  if(!bProcessed){ R'BB-  
   for(int index=0;index<MAX_KEY;index++){ ]jT}]9Q$  
    if(hCallWnd[index]==NULL) fQ+whGB  
     continue; KsDS!O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) U}92%W?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); hBgE%#`s  
   } dX(JV' 18A  
  } +p u[JHF  
 } HoI6(t  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *WE8J#]d  
} &raqrY|V  
3%vXB=>T!  
BOOL InitHotkey() |Xt G9A>  
{ xAm tm"  
 if(hHook!=NULL){ X[Y0r  
  nHookCount++; |}zWH=6  
  return TRUE; ay"jWL-  
 } {C |R@S  
 else `46~j  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); g`fG84  
  if(hHook!=NULL) Ni~IY# '  
   nHookCount++; dsTX?E<R  
  return (hHook!=NULL); G e;67  
} /wD f,Hduz  
BOOL UnInit() bY_'B5$.^2  
{ }[0nTd  
 if(nHookCount>1){ qqDg2,Yb  
  nHookCount--; ]b- 2:M  
  return TRUE; )O'LE&kQ|  
 } I}f`iBG  
 BOOL unhooked = UnhookWindowsHookEx(hHook); @SfQbM##%  
 if(unhooked==TRUE){ <Iw{fj|  
  nHookCount=0; 96WzgHPWo  
  hHook=NULL; X[tt'5  
 } s-p)^B  
 return unhooked; '-wmY?ZFxy  
} pcMzLMG<  
%;`Kd}CO  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) j~v`q5X  
{ d/_D|ivZ=  
 BOOL bAdded=FALSE; ki1(b]rf  
 for(int index=0;index<MAX_KEY;index++){ x0j5D  
  if(hCallWnd[index]==0){ '9\cIni0  
   hCallWnd[index]=hWnd; v9(5H Y  
   HotKey[index]=cKey; RZ6y5  
   HotKeyMask[index]=cMask; rr# nBhh8  
   bAdded=TRUE; 9r%fBiSk  
   KeyCount++; "i&)+dr-  
   break; B{Q}^Mcxy  
  } <rC%$tr  
 } o.KnDY  
 return bAdded; U[C>Aoze  
} 5|*{~O|  
% /:1eE`!S  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -K|1w'E  
{ MQ,K%_m8  
 BOOL bRemoved=FALSE; IQ&PPC  
 for(int index=0;index<MAX_KEY;index++){ eV7;#w<]  
  if(hCallWnd[index]==hWnd){ Vr2A7kq  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ gP_N|LuF"  
    hCallWnd[index]=NULL;  : (UK'i  
    HotKey[index]=0; uFr12ZFgK  
    HotKeyMask[index]=0; "FHJ_$!  
    bRemoved=TRUE; Q,?_;,I}  
    KeyCount--; /@:X0}L  
    break; >n7h%c  
   } P2n8HFi  
  } cSL6V2F  
 } *\ii +f-  
 return bRemoved; I`_2Q:r  
} Snr(<u  
l";Yw]:^  
void VerifyWindow() f' A$':Y  
{ ~5 6&!4  
 for(int i=0;i<MAX_KEY;i++){ BU -;P  
  if(hCallWnd!=NULL){ bEcs(Mc~  
   if(!IsWindow(hCallWnd)){ gIo\^ktW  
    hCallWnd=NULL; aM5]cc%  
    HotKey=0; @i ~A7L0/  
    HotKeyMask=0; +4yre^gC  
    KeyCount--; `v -[&  
   } ~'M<S=W  
  } 21TR_0g&<  
 } 8AR8u!;8  
} 4t*%(  
gC}}8( k  
BOOL CHookApp::InitInstance() ?]><#[?'L  
{ ]>M\|,wh  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); E &9<JS  
 hins=AfxGetInstanceHandle(); nDn J}`k  
 InitHotkey(); l uP;P&  
 return CWinApp::InitInstance(); .\_):j*  
} IiE6i43  
T)P)B6q   
int CHookApp::ExitInstance() $;5Q mKQ'  
{ tW/k  
 VerifyWindow(); EE 9w^.3a  
 UnInit(); V$ZclV2:Ih  
 return CWinApp::ExitInstance(); N.*)-O  
} Kq[4I[+R  
5 `1  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file gnJ8tuS  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) AM+5_'S,  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ kQkc+sGJf  
#if _MSC_VER > 1000 36.,:!%p  
#pragma once }MaY:PMA  
#endif // _MSC_VER > 1000 O2fq9%lk  
Avw=*ZW  
class CCaptureDlg : public CDialog ///Lg{ ie  
{ 96w2qgc2  
 // Construction Sp>g77@  
 public: A8f.h5~9  
  BOOL bTray; [9 MH"\  
  BOOL bRegistered; <vcU5 .K.  
  BOOL RegisterHotkey(); xn*$Ty+  
  UCHAR cKey; *2 Pr1U  
  UCHAR cMask; 3sr_V~cZ9  
  void DeleteIcon(); - l X4;  
  void AddIcon(); 1$b@C-B@g  
  UINT nCount; i q`}c |c  
  void SaveBmp(); L-+g`  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 6R45+<.  
  // Dialog Data }AS?q?4?  
  //{{AFX_DATA(CCaptureDlg) m-t: ' B  
  enum { IDD = IDD_CAPTURE_DIALOG }; )Qb,zS6  
  CComboBox m_Key; i~h@}0WR"  
  BOOL m_bControl; z}E_ wg  
  BOOL m_bAlt; y#'hOSR2  
  BOOL m_bShift; )$]lf }  
  CString m_Path; 4r(0+SO  
  CString m_Number; o 2 ng  
  //}}AFX_DATA \Th<7WbR6#  
  // ClassWizard generated virtual function overrides y,5qY}P+  
  //{{AFX_VIRTUAL(CCaptureDlg) wPg/.N9H  
 public: /\%<VBx ?q  
  virtual BOOL PreTranslateMessage(MSG* pMsg); rZ?:$],U!  
 protected: '3S~QN  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7^><Vh"qV  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 6]v}  
  //}}AFX_VIRTUAL ~5,^CTAM  
  // Implementation %:aXEjm@  
 protected: 3}nk9S:jr  
  HICON m_hIcon; ?%5VaxWJ  
  // Generated message map functions ,D{7=mDVm  
  //{{AFX_MSG(CCaptureDlg) X,Na4~JO(  
  virtual BOOL OnInitDialog(); ;M?)-dpZ  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ]FCP|Jz  
  afx_msg void OnPaint(); rpKZ>S|7+)  
  afx_msg HCURSOR OnQueryDragIcon(); b,Wm]N  
  virtual void OnCancel(); =zFROB\  
  afx_msg void OnAbout(); AJ7w_'u=@  
  afx_msg void OnBrowse(); %)j&/QdzF&  
  afx_msg void OnChange(); ?4':~;~  
 //}}AFX_MSG CyIlv0fd}  
 DECLARE_MESSAGE_MAP() FMdu30JV  
}; ! AwMD  
#endif =Pv_,%  
~ *&\5rPb  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file y?OP- 27y  
#include "stdafx.h" 7IxeSxXH  
#include "Capture.h" "0HUaU,e  
#include "CaptureDlg.h" JY  
#include <windowsx.h> ) lUS'I  
#pragma comment(lib,"hook.lib") Vg'R=+Wb  
#ifdef _DEBUG <IR#W$[  
#define new DEBUG_NEW e(7#>O%1  
#undef THIS_FILE u+V*U5v  
static char THIS_FILE[] = __FILE__; *X .1b!  
#endif 2u$-(JfoS  
#define IDM_SHELL WM_USER+1 =e6p v#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -$8ew+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); vh\i ^  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Ic(qA{SM  
class CAboutDlg : public CDialog e \Qys<2r  
{ !@& 3q|  
 public: FW-I|kK.  
  CAboutDlg(); J];Sj  
  // Dialog Data akvi^]x  
  //{{AFX_DATA(CAboutDlg) -+E.I*st  
  enum { IDD = IDD_ABOUTBOX }; EL~$7 J  
  //}}AFX_DATA IWE([<i}i[  
  // ClassWizard generated virtual function overrides mI8EeMa{  
  //{{AFX_VIRTUAL(CAboutDlg) `Na()r$T  
 protected: ( eKgc  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ox&5} &\  
  //}}AFX_VIRTUAL 3%*igpj\)  
  // Implementation z3a GK  
 protected: 5Od%Jhtt  
  //{{AFX_MSG(CAboutDlg) PIH\*2\/  
  //}}AFX_MSG 1h@qcom9K_  
  DECLARE_MESSAGE_MAP() ]ogifnwv  
}; $5pCfW8>  
ZO/e!yju  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) e bze_:  
{ +iC:/CJL  
 //{{AFX_DATA_INIT(CAboutDlg) }T[ @G6#  
 //}}AFX_DATA_INIT ExG(*[l  
} |:S6Gp[\O  
2}&ERW  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) +;W%v7 %<  
{ Gj?Zbl <  
 CDialog::DoDataExchange(pDX); =n,;S W  
 //{{AFX_DATA_MAP(CAboutDlg) llZU: bs  
 //}}AFX_DATA_MAP {($bz T7c  
} {L;sF=d  
%* 0GEfl/  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) v\@qMaPY  
 //{{AFX_MSG_MAP(CAboutDlg) 5[;[Te9=S  
 // No message handlers fAJyD`]Z  
 //}}AFX_MSG_MAP Kxr{Nx  
END_MESSAGE_MAP() w Q[|D2;  
"5N4 of 8  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~IZ-:?+S^  
: CDialog(CCaptureDlg::IDD, pParent) I<2`wL=  
{ ?J2{6,}O*.  
 //{{AFX_DATA_INIT(CCaptureDlg) ^ =C>  
  m_bControl = FALSE; O::FB.k  
  m_bAlt = FALSE;  J#` 7!  
  m_bShift = FALSE; Vq3NjN!+5  
  m_Path = _T("c:\\"); <.)=CK  
  m_Number = _T("0 picture captured."); c';~bYZ  
  nCount=0; Fu.aV876\f  
  bRegistered=FALSE; &6\&McmkX  
  bTray=FALSE; `sm Cfh}j6  
 //}}AFX_DATA_INIT ]\yB,  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 THwM',6  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); v:SHaUS  
} cx:_5GF  
[h-6;.e  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) wKpGJ& {  
{ i6paNHi*  
 CDialog::DoDataExchange(pDX); [<=RsD_q~  
 //{{AFX_DATA_MAP(CCaptureDlg) :=Zd)i)3  
  DDX_Control(pDX, IDC_KEY, m_Key); . Z&5TK4I  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); r $S9/  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 2xN7lfu1RB  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); uL)MbM]  
  DDX_Text(pDX, IDC_PATH, m_Path); 1t e^dh:Vp  
  DDX_Text(pDX, IDC_NUMBER, m_Number); |&@q$d  
 //}}AFX_DATA_MAP \>S.nW  
} j#f/M3  
OmuE l>  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) :P q&l.  
//{{AFX_MSG_MAP(CCaptureDlg) "1s ]74  
 ON_WM_SYSCOMMAND() $2Wk#F2c=  
 ON_WM_PAINT() =\]gL%N-|  
 ON_WM_QUERYDRAGICON() w}1IP-  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) `)a|Q  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 4&NB xe  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 7Q/H+)  
//}}AFX_MSG_MAP #m|el@)  
END_MESSAGE_MAP() 9,fV  
Mzg'$]N  
BOOL CCaptureDlg::OnInitDialog() |6d:k~p  
{ @zS/J,:v}  
 CDialog::OnInitDialog(); W\[E  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); P{dR pH|  
 ASSERT(IDM_ABOUTBOX < 0xF000); OyDoktz$)  
 CMenu* pSysMenu = GetSystemMenu(FALSE); =-!jm? st*  
 if (pSysMenu != NULL) q5g_5^csM{  
 { HZ<#H3_ix  
  CString strAboutMenu; NATi)A"TZ  
  strAboutMenu.LoadString(IDS_ABOUTBOX); :(enaHn#~  
  if (!strAboutMenu.IsEmpty()) .U(6])%;@  
  {  5V<6_o  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9y\nO)\Tv  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); w8D8\`i!"  
  } 8!v|`Ky  
 } `x=kb;  
 SetIcon(m_hIcon, TRUE); // Set big icon DQhHU1  
 SetIcon(m_hIcon, FALSE); // Set small icon ,;6%s>Cvd(  
 m_Key.SetCurSel(0); m@nGXl'!  
 RegisterHotkey(); fyUW;dj  
 CMenu* pMenu=GetSystemMenu(FALSE); qF3S\ C  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); :C;fEJN  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); =x w:@(]{  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); >kAJS??  
 return TRUE; // return TRUE unless you set the focus to a control Ty b_'|?rW  
} T\wOGaCW  
x75;-q  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 3=]/+{B  
{ TPb&";4ROf  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) a?Om;-i2`S  
 { ip'v<%,Q3"  
  CAboutDlg dlgAbout; -T+yS BO_3  
  dlgAbout.DoModal(); J>dj]1I  
 } e77s?WxbK  
 else W9cvxsox  
 { Nj6Np^@sH  
  CDialog::OnSysCommand(nID, lParam); p,WBF  
 } Rt%Dps%  
} f~d =1  
_BG `!3U+  
void CCaptureDlg::OnPaint() Ge$&k  
{ Q3lVx5G>4  
 if (IsIconic()) >ptI!\i}  
 { Q m9b:U~  
  CPaintDC dc(this); // device context for painting xG~-.  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); D vEII'-h  
  // Center icon in client rectangle Wm8BhO  
  int cxIcon = GetSystemMetrics(SM_CXICON); 3s BWtz  
  int cyIcon = GetSystemMetrics(SM_CYICON); ^?%ThPo_  
  CRect rect; <\:*cET3  
  GetClientRect(&rect); ve#[LBOC8  
  int x = (rect.Width() - cxIcon + 1) / 2; dd=5`Bo9Yh  
  int y = (rect.Height() - cyIcon + 1) / 2; ]Gl_L7u`  
  // Draw the icon ^R\5'9K!  
  dc.DrawIcon(x, y, m_hIcon); e /XOmv  
 } Kc9)Lzu+  
 else o\j<EQb.  
 { *=z.H  *  
  CDialog::OnPaint(); |q o3 E  
 } hQSJt[8My  
} 5}N O~Xd<  
Cyv_(Oh?dv  
HCURSOR CCaptureDlg::OnQueryDragIcon() 'iYaA-9j  
{ uJ*|SSN~  
 return (HCURSOR) m_hIcon; YVY(uq)d  
} !oV'  
LY0/\Z"N  
void CCaptureDlg::OnCancel() etW-gbr  
{ /C<} :R  
 if(bTray) jP @t!=  
  DeleteIcon(); Rx<[bohio  
  CDialog::OnCancel(); $AFiPH9  
} e ]>{?Z  
8/34{2048  
void CCaptureDlg::OnAbout() nDC5/xB  
{ gp'n'K]  
 CAboutDlg dlg; OQX ek@~2  
 dlg.DoModal(); U|h@Pw z  
} CvTgtZ '  
\v_t: "  
void CCaptureDlg::OnBrowse() a-TsD}'X  
{ #iGz&S3iN$  
 CString str; 8<^6<c  
 BROWSEINFO bi; ^_ZQf  
 char name[MAX_PATH]; D+_PyK~ jc  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); X'bp?m  
 bi.hwndOwner=GetSafeHwnd(); }Lwj~{  
 bi.pszDisplayName=name; **YNR:#Y  
 bi.lpszTitle="Select folder"; 48%a${Nvvj  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Ah2XwFg?  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); @p2dXJeR<  
 if(idl==NULL) =09j1:''<d  
  return; *DoEDw  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 7e#|=e *I!  
 str.ReleaseBuffer(); {_MU0=7c\  
 m_Path=str; cfe[6N  
 if(str.GetAt(str.GetLength()-1)!='\\') =Jl1D*B*  
  m_Path+="\\"; Pq7tNM E  
 UpdateData(FALSE); TAJ9Y<  
} kk5i{.?[  
XKU=VOY  
void CCaptureDlg::SaveBmp() lR^dT4  
{ z8"=W,2  
 CDC dc; ! xqG-rd '  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); kAk,:a;P  
 CBitmap bm; GrQAho  
 int Width=GetSystemMetrics(SM_CXSCREEN); <db/. A3  
 int Height=GetSystemMetrics(SM_CYSCREEN); Mw5!9@Fc7  
 bm.CreateCompatibleBitmap(&dc,Width,Height); E[Io8|QA  
 CDC tdc; %J%gXk}]  
 tdc.CreateCompatibleDC(&dc); v <Ze$^ e&  
 CBitmap*pOld=tdc.SelectObject(&bm); )J88gMk+  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); RBgkC+2  
 tdc.SelectObject(pOld); izW l5}+'B  
 BITMAP btm; 3S2'JOTY  
 bm.GetBitmap(&btm); |]\bgh  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; +[ }]a3)  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); /~tfP  
 BITMAPINFOHEADER bih; zB]T5]  
 bih.biBitCount=btm.bmBitsPixel; ;<X3AhF  
 bih.biClrImportant=0; '}YXpB  
 bih.biClrUsed=0; x?<5=,  
 bih.biCompression=0; 2RXGY  
 bih.biHeight=btm.bmHeight; m<f{7]fi5  
 bih.biPlanes=1; d<b,LD^  
 bih.biSize=sizeof(BITMAPINFOHEADER); E:E &Wv?r  
 bih.biSizeImage=size; yRi/YR#  
 bih.biWidth=btm.bmWidth; # nYGKZ  
 bih.biXPelsPerMeter=0; YV940A-n  
 bih.biYPelsPerMeter=0; K+$c,1wb  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); {4m"S 7O  
 static int filecount=0; H62*8y8  
 CString name; ft6^s(t  
 name.Format("pict%04d.bmp",filecount++); A0X0t  
 name=m_Path+name; O.}gG6u5  
 BITMAPFILEHEADER bfh; tB3CX\e  
 bfh.bfReserved1=bfh.bfReserved2=0; \+~4t  
 bfh.bfType=((WORD)('M'<< 8)|'B'); V= *J9~K  
 bfh.bfSize=54+size; -5 W0K}  
 bfh.bfOffBits=54; kL|Y-(FPo%  
 CFile bf; qRGb3l  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Qy/bzO  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); c_a$g  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); +l/j6)O`(m  
  bf.WriteHuge(lpData,size); S'JeA>L  
  bf.Close(); M>J ADt_]  
  nCount++; o%QQ7S3 P  
 } d$,i?d,  
 GlobalFreePtr(lpData); -pGt ;  
 if(nCount==1) E6@ ;e-]j  
  m_Number.Format("%d picture captured.",nCount); {n{}Y.  
 else :{ T#M$T  
  m_Number.Format("%d pictures captured.",nCount); 3ElpS^ 2W  
  UpdateData(FALSE); l=]vC +mU  
} n1/lE)  
Wkk Nyg,  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) PC_4#6^5  
{ &"h!SkX/  
 if(pMsg -> message == WM_KEYDOWN) ,< icW &a  
 { uWInx6p  
  if(pMsg -> wParam == VK_ESCAPE) .nH /=  
   return TRUE; kZ.3\  
  if(pMsg -> wParam == VK_RETURN) )IhY&?jk?  
   return TRUE; |\(/dXXP  
 } %UJ4wm  
 return CDialog::PreTranslateMessage(pMsg); )x7hhEk=^  
} #"{8Z&Z  
U[D<%7f  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) OA=;9AcZ  
{ ibc/x v2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ~=mM/@HD  
  SaveBmp(); bC{8yV=)  
  return FALSE;  :Y3?,  
} m'B6qy!}6  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ K)@}Ok"#\4  
 CMenu pop; WLl9>v^1  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); j1kc&(  
 CMenu*pMenu=pop.GetSubMenu(0); `x VA]GR4c  
 pMenu->SetDefaultItem(ID_EXITICON); zNf5OItx  
 CPoint pt; UIj/Id  
 GetCursorPos(&pt); dZgfls  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 6 {Z\cwP)c  
 if(id==ID_EXITICON) x+e _pb   
  DeleteIcon(); yMkd|1  
 else if(id==ID_EXIT) `7_LJ \>I  
  OnCancel(); ,AM-cwwT:u  
 return FALSE; eFI4(Y  
} \(FDR  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); _64@zdL+  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) OJ 5 !+#>  
 AddIcon(); mD)O\.uA  
 return res; 2AW{qwk7  
} q_&IZ,{Vk  
*~uuCLv_  
void CCaptureDlg::AddIcon() ZRm\d3x4  
{ 3p W MS&  
 NOTIFYICONDATA data; |pR$' HO  
 data.cbSize=sizeof(NOTIFYICONDATA); [;AcV73  
 CString tip; }AqD0Qd2Hj  
 tip.LoadString(IDS_ICONTIP); Y7)@(7G)\  
 data.hIcon=GetIcon(0); _[o^23Hj  
 data.hWnd=GetSafeHwnd(); Ig KAD#2a  
 strcpy(data.szTip,tip); h,'+w  
 data.uCallbackMessage=IDM_SHELL; @EZONKT  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; |=T<WU1$  
 data.uID=98; q*nz4QTOE  
 Shell_NotifyIcon(NIM_ADD,&data); W@dY:N}  
 ShowWindow(SW_HIDE); uP2a\C,$  
 bTray=TRUE; odf^W  
} s*~o%emw  
DZ.trtK  
void CCaptureDlg::DeleteIcon()  0QqzS  
{ Sg>0P*K@  
 NOTIFYICONDATA data; !y~b;>887  
 data.cbSize=sizeof(NOTIFYICONDATA); j]"xck  
 data.hWnd=GetSafeHwnd(); 5qSZ>DZ  
 data.uID=98; 9nS!  
 Shell_NotifyIcon(NIM_DELETE,&data); %:?QE ;  
 ShowWindow(SW_SHOW); #aX@mPm  
 SetForegroundWindow(); SqF.DB~  
 ShowWindow(SW_SHOWNORMAL); !gHWYWu)!  
 bTray=FALSE; <@2# VG  
} f;H#TSJ  
oD@jtd>b%  
void CCaptureDlg::OnChange() rI+w1';C1  
{ D])YP0|}  
 RegisterHotkey(); >?eTbtP  
} Pm(:M:a  
_lv:"/3R  
BOOL CCaptureDlg::RegisterHotkey() GPLt<K!<#  
{ '2$!thm  
 UpdateData(); DF|s,J`98  
 UCHAR mask=0; %H@76NvEz  
 UCHAR key=0; E2H<{Q   
 if(m_bControl) WcO,4:  
  mask|=4; ;OU>AnWr(&  
 if(m_bAlt) ;;hyjFGq%  
  mask|=2; ]NV ]@*`tO  
 if(m_bShift) t`ceVS  
  mask|=1; "ak9LZQ9z  
  key=Key_Table[m_Key.GetCurSel()]; 5qkuK F  
 if(bRegistered){ /JubiLEK  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); :;;WK~* #  
  bRegistered=FALSE; 6oh@$.ThG  
 } X/K)kIi  
 cMask=mask; 'Sy *'&  
 cKey=key; \Fg6b6  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); #x@lZ!Y  
 return bRegistered; etMh=/NFV  
} ,nB3c5X)|  
IKzRM|/  
  四、小结 0&IXzEOr  
6*aa[,>  
  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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