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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: FTeu~<KpM  
  qvv2O1c"A  
  一、实现方法 @`,1:  
-%I2[)F<  
  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: B0ndcB-  
QQV~?iW{~  
#pragma data_seg("shareddata") al[n, u  
HHOOK hHook =NULL; //钩子句柄 X 51Yfr  
UINT nHookCount =0; //挂接的程序数目 oI#a_/w  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 A4]s~Ur  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 xSBc-u#< G  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ;Yg{zhJX~  
static int KeyCount =0; -^ C=]Medl  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 [V) L  
#pragma data_seg() <bD>m[8,  
EVNY*&p  
  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。 L^{|uP15N  
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  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: gL3"Gg3  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR $&2UTczp  
cKey,UCHAR cMask) j8sH#b7Z  
{ Zw~+Pb  
 BOOL bAdded=FALSE; e~"fn*"  
 for(int index=0;index<MAX_KEY;index++){ }@^4,FKJ  
  if(hCallWnd[index]==0){ Bk+{RN(w  
   hCallWnd[index]=hWnd; A2n qf^b{#  
   HotKey[index]=cKey; kn/Ao}J74z  
   HotKeyMask[index]=cMask; YXI'gn2b#  
   bAdded=TRUE; 9,^_<O@Q  
   KeyCount++; Y!T %cTK)a  
   break; }YHX-e<Yx]  
  } FEJ~k1z  
 } EMc;^ d  
 return bAdded; !Lh^oPT"I  
} E.U_W  
//删除热键 O/!bG~\Y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]7rj/l$ u  
{ 8zBWIi  
 BOOL bRemoved=FALSE; RTFZPq84  
 for(int index=0;index<MAX_KEY;index++){ V14B[|YM<  
  if(hCallWnd[index]==hWnd){ H`geS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ W mm4hkf  
    hCallWnd[index]=NULL; %.z,+Zz?  
    HotKey[index]=0; - > J_ ~  
    HotKeyMask[index]=0; MW+b;0U`#  
    bRemoved=TRUE; A3ZY~s#Iv  
    KeyCount--; YQS5P#  
    break; chEn|>~  
   } A=j0On  
  } .n=Z:*JqQ  
 } s-S }i{Z!  
 return bRemoved; %G?;!Lz  
} ;q1A*f\:#  
{Ions~cO)  
T_lsGu/  
  DLL中的钩子函数如下: "jaJr5Wv=y  
m B\C?=_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {$1J=JbE  
{ >G'SbQ8  
 BOOL bProcessed=FALSE; jU5}\oP@  
 if(HC_ACTION==nCode) AZ{^o4<q  
 { 8Mbeg ,P  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ~I(Hc.Q  
   switch(wParam) E.iSWAJ(w  
   {  & V)6!,rb  
    case VK_MENU: ZoB {x*IH  
     MaskBits&=~ALTBIT; nA~E "*  
     break; NzW`B^p  
    case VK_CONTROL: NxLXm,  
     MaskBits&=~CTRLBIT; :(_+7N[KA  
     break; X@|&c]]  
    case VK_SHIFT: 4Ua> Yw0  
     MaskBits&=~SHIFTBIT; 1lpwZ"  
     break; e hA;i.n  
    default: //judge the key and send message 42\-~]  
     break; y8\S}E 0  
   } @EoZI~  
   for(int index=0;index<MAX_KEY;index++){ dCFlM&(i  
    if(hCallWnd[index]==NULL) ZY56\qcY  
     continue; K2<~(78C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) NOS>8sy  
    { )H}#A#ovj7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); SZ_V^UX_  
     bProcessed=TRUE; 1>Q'R  
    } <vUVP\u~$  
   } W8g' lqc|  
  } h},oF!,  
  else if((lParam&0xc000ffff)==1){ //有键按下 U/NBFc:[y:  
   switch(wParam) JO'>oFv_W  
   { ')N{wSM9Ft  
    case VK_MENU: A$WZF/x  
     MaskBits|=ALTBIT; ~xIj F1Z  
     break; LA[g(i 7  
    case VK_CONTROL: jp+_@S>  
     MaskBits|=CTRLBIT; d HJhFw  
     break; 9*:gr#(5  
    case VK_SHIFT: wIf {6z{  
     MaskBits|=SHIFTBIT; ,]5Ic.};p  
     break; _xLHrT!y  
    default: //judge the key and send message &Sp -w?kM  
     break; nP UqMn'  
   } {>bW>RO)  
   for(int index=0;index<MAX_KEY;index++){ ="d*E/##  
    if(hCallWnd[index]==NULL) s[Ur~Wvn  
     continue; 1J? dK|% b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DKm Z  
    { mw^7oO#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); qSx(X!YS  
     bProcessed=TRUE; W~Z<1[  
    } HWm#t./  
   } jn.C|9/mj  
  } @d&/?^dp6  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 :3$}^uzIq  
   for(int index=0;index<MAX_KEY;index++){ z* <y5  
    if(hCallWnd[index]==NULL) |p00j|k   
     continue; X#w%>al  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :h,`8 Di  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ^JR;epVJ  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ]Zf6Yw.Y  
   } mNYl@+:psj  
  } 0L^u2HZYL  
 } \x >65;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); O3o: qly!  
} $t-n'Qh^2  
jtm?z c  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: #?B%Ja% ;W  
N:"C+ a(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~}DQT>7$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); q/1Or;iK  
z}Jr^>  
  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: CCDDK L]N:  
4ujvD^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) t_ur&.^SB  
{ MP>n)!R[`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) e &9F\e  
 { k8]O65t|  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 =i HiPvP0  
  SaveBmp(); ug`NmIQP  
  return FALSE; ;PyZ?Z;  
 } 9F;S+)H4  
 …… //其它处理及默认处理 q|)Q9+6$+  
} ]+H ?@*b`  
V84*0&qOW  
iGXBqUQ:  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ~]L}p  
gBk5wk_j|  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 sn{AwF%  
]=F8p2w?  
  二、编程步骤 fMf&?`V  
O''y>N9  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; o0z67(N&g  
/b,TpuM^  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; TQ9D68 ,  
iwY'4 Z e  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; YW; Hk1  
N6Z{BLZ  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; P|jF6?C  
=GR 'V  
  5、 添加代码,编译运行程序。 o{-<L  
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三、程序代码 f*xpE`&  
7 boJ*  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL kVDe6},D7  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) y~<@x.  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ dv N<5~  
#if _MSC_VER > 1000 8Og3yFx[rt  
#pragma once pz doqAVI  
#endif // _MSC_VER > 1000 p D=w >"  
#ifndef __AFXWIN_H__ tu%[p 4   
#error include 'stdafx.h' before including this file for PCH >adV(V<  
#endif 99iUOw c  
#include "resource.h" // main symbols hh.Q\qhubB  
class CHookApp : public CWinApp gmSQcN)  
{ 0NO1M)HQv  
 public: o`r(`6@  
  CHookApp(); YT yX`Y#  
  // Overrides v vE\  
  // ClassWizard generated virtual function overrides `3iQZu i  
  //{{AFX_VIRTUAL(CHookApp) ?n'O Fpd  
 public: %kU'hzLg  
  virtual BOOL InitInstance(); PoD^`()FR{  
  virtual int ExitInstance(); '=cKU0 G#  
  //}}AFX_VIRTUAL X,v4d~>]  
  //{{AFX_MSG(CHookApp) RB3 zHk%  
  // NOTE - the ClassWizard will add and remove member functions here. yi!`V.  
  // DO NOT EDIT what you see in these blocks of generated code ! "2Op[~V  
  //}}AFX_MSG qs=tJ ^<<o  
  DECLARE_MESSAGE_MAP() d$;/T('  
}; Qu~*46?0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 2Ji+{,?,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); GHN3PEJ>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G{c#\?12C  
BOOL InitHotkey(); E,*&BDW  
BOOL UnInit(); aU<s<2 O)  
#endif &$ p[  
=3ADT$YHd  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. AZZRa69=  
#include "stdafx.h" MC=G"m:_  
#include "hook.h" Rf[V)x  
#include <windowsx.h> RIhOR8 )  
#ifdef _DEBUG ,{<p  
#define new DEBUG_NEW d\]O'U)s  
#undef THIS_FILE Bh`IXu  
static char THIS_FILE[] = __FILE__; v:d9o.h  
#endif Q~ 0Dfo w?  
#define MAX_KEY 100  H+cNX\,  
#define CTRLBIT 0x04 ` Q9+k<  
#define ALTBIT 0x02 g#W_S?  
#define SHIFTBIT 0x01 M#0 @X  
#pragma data_seg("shareddata")  ^Omfe  
HHOOK hHook =NULL; |f NMs  
UINT nHookCount =0; <d@pmh  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey {j6g@Vd6lx  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT -i_En^Fi  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey IL2r9x%  
static int KeyCount =0; lfy7w|  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift AQ@v>wr}  
#pragma data_seg() NfF~dK|  
HINSTANCE hins; koH4~m{  
void VerifyWindow(); d=e{]MG(  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) .C5@QKU  
//{{AFX_MSG_MAP(CHookApp) a c6*v49  
// NOTE - the ClassWizard will add and remove mapping macros here. ~Fx&)kegTo  
// DO NOT EDIT what you see in these blocks of generated code! xv0M  
//}}AFX_MSG_MAP 4r*Pa(;y  
END_MESSAGE_MAP() 5G? .T?  
W/v|8-gcK  
CHookApp::CHookApp() YsAF{  
{ k|#Zy,  
 // TODO: add construction code here, ,h!X k  
 // Place all significant initialization in InitInstance aJ2H.E  
} wD=am  
R$xY8+}V  
CHookApp theApp; 2z-$zB<vyw  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %c1FwAC  
{ 4 =Fg!Eu<  
 BOOL bProcessed=FALSE; 37K U~9-A  
 if(HC_ACTION==nCode) cV]y=q 6  
 { 7!- \L7<  
  if((lParam&0xc0000000)==0xc0000000){// Key up $- w5o`e  
   switch(wParam) eU~?p|Np  
   { ve%l({  
    case VK_MENU: S OI)/u  
     MaskBits&=~ALTBIT; &"AQ; %&N  
     break; L<)Z>@fR  
    case VK_CONTROL: 0P9Wy!f7  
     MaskBits&=~CTRLBIT; "/y|VTV"  
     break; *8206[y  
    case VK_SHIFT: 5bBCpNa  
     MaskBits&=~SHIFTBIT; DR{] sG  
     break; 6S_y%8Fv&[  
    default: //judge the key and send message 0UD"^zgY  
     break; 1"$R 3@s;  
   } tDU}rI8?  
   for(int index=0;index<MAX_KEY;index++){ M c@GH  
    if(hCallWnd[index]==NULL) )l{A{f6O  
     continue; YOKR//|3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N ^f}ui i  
    { > Z++^YVE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .Qk{5=l6P  
     bProcessed=TRUE; `]hCUaV   
    } ZvyjMLf  
   } `5<1EGJsD  
  } %1Jd ^[W  
  else if((lParam&0xc000ffff)==1){ //Key down #Gp M22d'(  
   switch(wParam) TF)8qHy! u  
   { Zsk?QS FE  
    case VK_MENU: s*+ZYPk  
     MaskBits|=ALTBIT; Z~R dFC  
     break; Mz}i[|U\  
    case VK_CONTROL: 54wM8'+  
     MaskBits|=CTRLBIT; .xnQd^qoac  
     break; Q;@X2 JSp  
    case VK_SHIFT: \6LcVik  
     MaskBits|=SHIFTBIT; {9'hOi50  
     break; [,nfAY  
    default: //judge the key and send message J=V yyUB  
     break; 2 mq%|VG'  
   } QqjTLuN  
   for(int index=0;index<MAX_KEY;index++) ?N2X)Y@yi  
   { /KP_Vc:g2_  
    if(hCallWnd[index]==NULL) b.,$# D{p  
     continue; NlMQHma  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,W8au"  
    { :@WLGK*u.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Fu mn9  
     bProcessed=TRUE; @92gb$xT  
    } F_ _H(}d  
   } mf~Lzp  
  } X,&xhSzg?  
  if(!bProcessed){ {\luieG  
   for(int index=0;index<MAX_KEY;index++){ Y 0]Kl^\A  
    if(hCallWnd[index]==NULL) 4UazD_`'  
     continue; -g<cinNSp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) tnNZ`]qY  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Lv^a+'  
   } v2(U(Tt  
  } fX""xT NPi  
 } 9yDFHz w  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); p/4S$ j#Tn  
} ,?fN#gc :  
n)Hk8)^8  
BOOL InitHotkey() RAdvIIQp:  
{ T[m ~6  
 if(hHook!=NULL){ ^xmZ|f-  
  nHookCount++; 2!{N[*)  
  return TRUE; rEg+i@~  
 } <gR`)YF7  
 else 8 `o{b"l+  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); C*$|#.l  
  if(hHook!=NULL) s7vPI   
   nHookCount++; q?1yE@th  
  return (hHook!=NULL); :"y0oCu7`W  
} yIlV[_  
BOOL UnInit() F1E. \l  
{ *|@+rbjVC  
 if(nHookCount>1){ |zT%$  
  nHookCount--; *WD;C0?z  
  return TRUE; N:A3kp  
 } 5nY9Ls(e  
 BOOL unhooked = UnhookWindowsHookEx(hHook); CN-4-  
 if(unhooked==TRUE){ exsQmbj* %  
  nHookCount=0; vs+ We*8H  
  hHook=NULL; 8~}s 3j4  
 } d RHlx QUn  
 return unhooked; S\}?zlV  
} #i@ACAgn;6  
pEY>A_F  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) M9h<}mh\  
{ HUK" OH  
 BOOL bAdded=FALSE; (K<Z=a  
 for(int index=0;index<MAX_KEY;index++){ {WIY8B'c  
  if(hCallWnd[index]==0){ <( cM*kV  
   hCallWnd[index]=hWnd; _F3KFQ4,S-  
   HotKey[index]=cKey; `B:B7Cpvn  
   HotKeyMask[index]=cMask; (/('nY  
   bAdded=TRUE; 2B5A!? ~>  
   KeyCount++; Jk%'mEGE  
   break; (21']x  
  } zUNH8=U  
 } 10/x'#(  
 return bAdded; Q%+ }  
} #aj|vox}  
Ii,~HH  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~:2&/MOP?  
{ C{DlcZ<  
 BOOL bRemoved=FALSE; 9e0C3+)CY  
 for(int index=0;index<MAX_KEY;index++){ .@fK;/OuC  
  if(hCallWnd[index]==hWnd){ Nvi Fq  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _E3U.mV  
    hCallWnd[index]=NULL; 0S%tsXt+  
    HotKey[index]=0; {qJHL;mP:8  
    HotKeyMask[index]=0; -m E  
    bRemoved=TRUE;  { VS''Lv  
    KeyCount--; f2`P8$U)R  
    break; a|8| @,  
   } ,LoMt ]H  
  } &b 5T&-C<  
 } vYYS .ve  
 return bRemoved; dK[*  
} _{[k[]  
MV% :ES?  
void VerifyWindow() M ' a&  
{ GU:r vS!  
 for(int i=0;i<MAX_KEY;i++){ BhOXXa{B  
  if(hCallWnd!=NULL){ @^'G&%j  
   if(!IsWindow(hCallWnd)){ &G0l&8pa  
    hCallWnd=NULL; VfQMFb',o  
    HotKey=0; A*G )CG  
    HotKeyMask=0; Lhl$w'r  
    KeyCount--; cxAViWsf  
   } TP{>O%b  
  } S`ax*`  
 } hO5K\QnRL  
} "PZYgl  
pESB Il  
BOOL CHookApp::InitInstance() {E;2&d  
{ T@%;0Ro~  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Y1#-^,qg  
 hins=AfxGetInstanceHandle(); c-[Q,c  
 InitHotkey(); aQl?d<|+lk  
 return CWinApp::InitInstance(); MZ;"J82p  
} ,Wz[tYL*  
6U;Jg_zS  
int CHookApp::ExitInstance() 9@$tiDV  
{ #H'sZv  
 VerifyWindow(); "Czz,;0  
 UnInit(); fR+Ov8PCq  
 return CWinApp::ExitInstance(); 7p P|  
} 9(QU2QY  
l81&[  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 6(ka"Vu~  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) L@)b%Q@a  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ E}xz7u   
#if _MSC_VER > 1000 3I'M6WA  
#pragma once l9M#]*{  
#endif // _MSC_VER > 1000 f28gE7Y\a  
f?/|;Zo4  
class CCaptureDlg : public CDialog [z W_%O kP  
{ ?l)}E  
 // Construction ^Nd|+}  
 public: dH ^b)G4  
  BOOL bTray; tqff84  
  BOOL bRegistered; `f\5p+!<7R  
  BOOL RegisterHotkey(); =XZF.ur  
  UCHAR cKey; R=][>\7]}  
  UCHAR cMask; Qh)|FQ[s$r  
  void DeleteIcon(); :6 Hxxh  
  void AddIcon(); n/KI"qa]9  
  UINT nCount; K[iY{  
  void SaveBmp(); Y|hzF:ll  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor s|{^ }4{  
  // Dialog Data I}*]m%'-Y  
  //{{AFX_DATA(CCaptureDlg) fK)ZJ_?w,@  
  enum { IDD = IDD_CAPTURE_DIALOG }; S(g<<Te  
  CComboBox m_Key; 3Eb nZb  
  BOOL m_bControl; u#zP>!  
  BOOL m_bAlt; %f_)<NP9=  
  BOOL m_bShift; !~Hafn-1  
  CString m_Path; (hhdbf  
  CString m_Number; 5@w'_#!)  
  //}}AFX_DATA q#mFN/.(+  
  // ClassWizard generated virtual function overrides gE-w]/1zD5  
  //{{AFX_VIRTUAL(CCaptureDlg) q8'@dH  
 public: 9pVf2|5hj  
  virtual BOOL PreTranslateMessage(MSG* pMsg); adRNrt*!  
 protected: r6O7&Me<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support '<R B  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); V\iIvBpWg  
  //}}AFX_VIRTUAL "<cB73tY  
  // Implementation ~)! V8  
 protected: $Nt=gSWw5  
  HICON m_hIcon; t7U,AQ=;P5  
  // Generated message map functions 4=?Ok":8  
  //{{AFX_MSG(CCaptureDlg) 8>%jZ%`a  
  virtual BOOL OnInitDialog(); /{eih]`x(  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); .LeF|EQU\@  
  afx_msg void OnPaint(); 9G`FY:(K  
  afx_msg HCURSOR OnQueryDragIcon(); 7$q2v=tH_  
  virtual void OnCancel(); tF#b&za  
  afx_msg void OnAbout(); s8f3i\1  
  afx_msg void OnBrowse(); N=O+X~  
  afx_msg void OnChange(); [[*0MA2Y  
 //}}AFX_MSG buq *abON  
 DECLARE_MESSAGE_MAP() 4%',scn  
}; ~xlMHf  
#endif +LQs.*  
:=iM$_tp'  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file W(u6J#2  
#include "stdafx.h" ZbZAx:L  
#include "Capture.h" ;y?D1o^r8W  
#include "CaptureDlg.h" 'gk81@|  
#include <windowsx.h> zJy 89ib'  
#pragma comment(lib,"hook.lib") h+zkVRyA  
#ifdef _DEBUG S5*~r@8h  
#define new DEBUG_NEW *0Wi^f  
#undef THIS_FILE /JK-}E  
static char THIS_FILE[] = __FILE__; /VhE<}OtH  
#endif ;EE&~&*w  
#define IDM_SHELL WM_USER+1 wB1|r{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U&Sbm~Qi  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); q/rHHuY}  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; #o;CmB  
class CAboutDlg : public CDialog q[y,J  
{ y o |"-  
 public: }Uc)iNU  
  CAboutDlg(); SWrP0Qjc  
  // Dialog Data XAF*jevr  
  //{{AFX_DATA(CAboutDlg) qH1&tW$  
  enum { IDD = IDD_ABOUTBOX }; E+xC1U 3  
  //}}AFX_DATA HbXYinG%  
  // ClassWizard generated virtual function overrides p&|:,|jo5  
  //{{AFX_VIRTUAL(CAboutDlg) hxQx$  
 protected: JXA!l ?%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support uF89B-t  
  //}}AFX_VIRTUAL 236,o {9e  
  // Implementation TowRY=#jiS  
 protected: ! >l)*jN8  
  //{{AFX_MSG(CAboutDlg) V$';B=M  
  //}}AFX_MSG MmPLJ  
  DECLARE_MESSAGE_MAP() s 8 c#_  
}; heN?lmC  
ueD_<KjE=  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) q"O4}4`  
{ zEYT,l  
 //{{AFX_DATA_INIT(CAboutDlg) mxQPOu  
 //}}AFX_DATA_INIT >^5U XQr  
} Bc^ MZ~+ip  
,8^QV3  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) y m~  
{ f7_EqS=(  
 CDialog::DoDataExchange(pDX); E+$%88  
 //{{AFX_DATA_MAP(CAboutDlg) PA_54a9/<  
 //}}AFX_DATA_MAP 7_*k<W7|  
} ]> dCt<  
"ke>O'   
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) g=5vnY  
 //{{AFX_MSG_MAP(CAboutDlg) XV|u!'Ey  
 // No message handlers _2N7E#m"S  
 //}}AFX_MSG_MAP "Smek#l  
END_MESSAGE_MAP() {i09e1  
R%\K<#^\  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ^< o"3?  
: CDialog(CCaptureDlg::IDD, pParent) gc KXda(  
{ eNEMyv5{w4  
 //{{AFX_DATA_INIT(CCaptureDlg) 1U(P0$C  
  m_bControl = FALSE; U.,_zEbx,  
  m_bAlt = FALSE; Dq:>]4%  
  m_bShift = FALSE; +i0j3.  
  m_Path = _T("c:\\"); 8pZGu8  
  m_Number = _T("0 picture captured."); lUJ~_`D  
  nCount=0; u{+z?N  
  bRegistered=FALSE; wYLi4jYm  
  bTray=FALSE; 4ZAnq{nR4  
 //}}AFX_DATA_INIT uKL4cr@  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 @j/|U04_ Z  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); .Fe_Z)i>h  
} [W#M(`}D  
: 3 aZ_  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Q eZg l!  
{ S_ELV#X  
 CDialog::DoDataExchange(pDX); \J0fr'(S  
 //{{AFX_DATA_MAP(CCaptureDlg) E[8R )xC@  
  DDX_Control(pDX, IDC_KEY, m_Key); 2#hfBJg@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); k=D}i\F8  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ~As/cd>9  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); &oXN*$/dlJ  
  DDX_Text(pDX, IDC_PATH, m_Path); e*?@6E  
  DDX_Text(pDX, IDC_NUMBER, m_Number); )GC9%mF;  
 //}}AFX_DATA_MAP _ a`J>~$  
} _d`)N  
&u}]3E'-k  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) :*6#(MX  
//{{AFX_MSG_MAP(CCaptureDlg) ,u&K(Z%  
 ON_WM_SYSCOMMAND() lI*uF~ 'D  
 ON_WM_PAINT() W8><  
 ON_WM_QUERYDRAGICON() 6PyODW;R/5  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) P1>?crw  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) &4R -5i2a  
 ON_BN_CLICKED(ID_CHANGE, OnChange) b Y^K)0+^s  
//}}AFX_MSG_MAP (G<fvl!~  
END_MESSAGE_MAP() 1@"os[ 9  
alV{| Vf[6  
BOOL CCaptureDlg::OnInitDialog() Wn kIi,<  
{ \]y /EOT  
 CDialog::OnInitDialog(); KW 78J~u+  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); $[1J[eY*  
 ASSERT(IDM_ABOUTBOX < 0xF000); s-"oT=  
 CMenu* pSysMenu = GetSystemMenu(FALSE); (l ]_0-Z  
 if (pSysMenu != NULL) zS<idy F`  
 { px>g  
  CString strAboutMenu; #x|IEjoa  
  strAboutMenu.LoadString(IDS_ABOUTBOX); &s>E~M0+J  
  if (!strAboutMenu.IsEmpty()) ?Tr\r1s]  
  { }VDJ  
   pSysMenu->AppendMenu(MF_SEPARATOR); 5xIOi(3`Q  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); (ibj~g?U,  
  } ]r\d 5  
 } Gj ka %  
 SetIcon(m_hIcon, TRUE); // Set big icon ! 0DOj["  
 SetIcon(m_hIcon, FALSE); // Set small icon MLk%U 4  
 m_Key.SetCurSel(0); WLkfo6Nw  
 RegisterHotkey(); `vc?*"  
 CMenu* pMenu=GetSystemMenu(FALSE); sb"h:i>O4  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); kmZ  U;Z  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); vZJu =t  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); I/`\>Hk  
 return TRUE; // return TRUE unless you set the focus to a control *ud/'HR8]  
} t8_i[Hw6D  
)~LqBh  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) >9i%Yuy](  
{ l/6$BP U`  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) t[=teB v<  
 { ,E3Ze*(U  
  CAboutDlg dlgAbout; ^EF VjGM  
  dlgAbout.DoModal(); fB"It~ p  
 } <]wQ;14;H  
 else FesUE_L2$  
 { O;C C(  
  CDialog::OnSysCommand(nID, lParam); 1}XESAX;0  
 } 1P6!E*z\  
} vL ]z3  
e4<[|B!O  
void CCaptureDlg::OnPaint() o)r%4YOL  
{ x4^* YZc$,  
 if (IsIconic()) qtYVX:M@,  
 { h'|J$   
  CPaintDC dc(this); // device context for painting =OR "Bd:O  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?j|i|WUD  
  // Center icon in client rectangle + )lkHv$R  
  int cxIcon = GetSystemMetrics(SM_CXICON); DNmP>~  
  int cyIcon = GetSystemMetrics(SM_CYICON); ~;D5j) 9I  
  CRect rect; uz'MUT(68  
  GetClientRect(&rect); \_|g}&}6Y  
  int x = (rect.Width() - cxIcon + 1) / 2; *DS>#x@3*i  
  int y = (rect.Height() - cyIcon + 1) / 2; O&@pi-=o  
  // Draw the icon ay`A Gr  
  dc.DrawIcon(x, y, m_hIcon); .0b4"0~T6  
 } ? e<D +  
 else yDmx)^En  
 { \l71Q/y6u`  
  CDialog::OnPaint(); H*R4AE0  
 } XZH\HK)K-]  
} k?VH4 yA  
.z}*!   
HCURSOR CCaptureDlg::OnQueryDragIcon() Ux b>)36I  
{ W0;MGBfb  
 return (HCURSOR) m_hIcon; (_Ky' .  
} i{2ny$55h  
P`TJqJiY~  
void CCaptureDlg::OnCancel() CEl9/"0s6  
{ _4-UM2o;  
 if(bTray) ;!Q}g19C  
  DeleteIcon(); kDWMget$  
  CDialog::OnCancel(); /j$`Cq3I  
} 'd |*n#Dqc  
SEXmVFsQ  
void CCaptureDlg::OnAbout() [iGL~RiXtn  
{ >))K%\p   
 CAboutDlg dlg; 9D,/SZ-v  
 dlg.DoModal(); <BX'Owbs!O  
} ukwO%JAr  
`w K6B5>  
void CCaptureDlg::OnBrowse() w7`09oJm  
{ WNcJ710k27  
 CString str; %Gc)$z/Wd  
 BROWSEINFO bi; "?r_A*U  
 char name[MAX_PATH]; i&Xjbcbp  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); t~kh?u].j  
 bi.hwndOwner=GetSafeHwnd(); 'H8;(Rw  
 bi.pszDisplayName=name; u)9YRMl  
 bi.lpszTitle="Select folder"; 716r/@y$6  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; /M5R<rl  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); eYD-8*  
 if(idl==NULL) 6O| rI>D  
  return; CA]u3bf~  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 2kW*Z7@D  
 str.ReleaseBuffer(); MNu\=p\Eq  
 m_Path=str; s]'EIw}mo  
 if(str.GetAt(str.GetLength()-1)!='\\') {2T;^+KE  
  m_Path+="\\"; qj:\ )#I  
 UpdateData(FALSE); A40Q~X  
} [Nv)37|W  
3fd?xhWbN  
void CCaptureDlg::SaveBmp() 7;3;8Q FX  
{ $9rQ w1#e  
 CDC dc; D]NJ ^.X  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); k4+Q$3"  
 CBitmap bm; Ux+UcBKm-  
 int Width=GetSystemMetrics(SM_CXSCREEN); 9 `T2  
 int Height=GetSystemMetrics(SM_CYSCREEN); Rg\D-F6:  
 bm.CreateCompatibleBitmap(&dc,Width,Height); |}D5q| d@n  
 CDC tdc; v]c+|nRs  
 tdc.CreateCompatibleDC(&dc); I08W I u  
 CBitmap*pOld=tdc.SelectObject(&bm); u`Abko<D  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ':#DROe!  
 tdc.SelectObject(pOld); :)DvZxHE@  
 BITMAP btm; ZIs=%6""&  
 bm.GetBitmap(&btm); Apbgm[m|{  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; RhD   
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); P&5kO;ia  
 BITMAPINFOHEADER bih; ,lb >  
 bih.biBitCount=btm.bmBitsPixel; `L7Cf&W\l8  
 bih.biClrImportant=0; -s&7zqW  
 bih.biClrUsed=0; Zr|z!S?aSC  
 bih.biCompression=0; @~C C$Y$  
 bih.biHeight=btm.bmHeight; ufvjW]   
 bih.biPlanes=1; s}g3*_"  
 bih.biSize=sizeof(BITMAPINFOHEADER); d]+2rt}]hL  
 bih.biSizeImage=size; z6uHe{|  
 bih.biWidth=btm.bmWidth; ;&`6b:ug  
 bih.biXPelsPerMeter=0; PaZd^0'!Z  
 bih.biYPelsPerMeter=0; MoC@n+Q+@  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); \W+Hzf] W#  
 static int filecount=0; ,iMdv+  
 CString name; p@[n(?duC.  
 name.Format("pict%04d.bmp",filecount++); h )h%y)1  
 name=m_Path+name; 4MPR  
 BITMAPFILEHEADER bfh; k\Z@B!VAq  
 bfh.bfReserved1=bfh.bfReserved2=0; FJ{6_=@D  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 6ac_AsFK  
 bfh.bfSize=54+size; {ug*  
 bfh.bfOffBits=54; -7(,*1Tk  
 CFile bf; d:JP935  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ V@pUU~6R  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); nQ08(8  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); N4$ K {  
  bf.WriteHuge(lpData,size); Ls/*&u  
  bf.Close(); |u_fVQj  
  nCount++; d5#z\E??  
 } &}!AjA)  
 GlobalFreePtr(lpData); FE3uNfQs|  
 if(nCount==1) EpB3s{B"  
  m_Number.Format("%d picture captured.",nCount); DA^!aJ6iF  
 else :Ny^-4-N  
  m_Number.Format("%d pictures captured.",nCount); f6`W(OiE  
  UpdateData(FALSE); m ;{(U Z  
} #Q$e%VJ(c1  
;!,I1{`  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) .Z(Q7j^  
{ (N?nOOQ  
 if(pMsg -> message == WM_KEYDOWN) u]sxX")  
 { c]A @'{7  
  if(pMsg -> wParam == VK_ESCAPE) zvR;Tl6]  
   return TRUE; iiv`ji  
  if(pMsg -> wParam == VK_RETURN) C@!bd+'  
   return TRUE; m*vz   
 } V<Co!2S  
 return CDialog::PreTranslateMessage(pMsg); &/8B (0<  
} qflOi8  
1^tM%2rP'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) OXS.CFZM  
{ 7[:?VXQ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ l._g[qa  
  SaveBmp(); =4 NKXP~C  
  return FALSE; $J=`fx  
} hCob^o  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ g"v6UZ\  
 CMenu pop; _*-b0}T   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); +zZ]Txb(  
 CMenu*pMenu=pop.GetSubMenu(0); 5#mHWBGd7  
 pMenu->SetDefaultItem(ID_EXITICON); &Y1RPO41J  
 CPoint pt; z-^/<u1p  
 GetCursorPos(&pt); SXx4^X  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); rm4t  
 if(id==ID_EXITICON) V(;c#%I2  
  DeleteIcon(); DWupLJpk;c  
 else if(id==ID_EXIT) +do* C =z  
  OnCancel(); RmJ|g<  
 return FALSE; J~)JsAXAI  
} 8^!ib/@v"  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1pP q)}=+  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) !*PX -  
 AddIcon(); N5 mhs#  
 return res; >OKc\m2%Q  
} <.:mp1,8V  
<vd}oiB@  
void CCaptureDlg::AddIcon() 85BB{ T;  
{ }c=YiH,o  
 NOTIFYICONDATA data; EpK7VW  
 data.cbSize=sizeof(NOTIFYICONDATA); R~BFZF>:  
 CString tip; _7<G6q2(  
 tip.LoadString(IDS_ICONTIP); {EJ+   
 data.hIcon=GetIcon(0); FTu<$`!1L  
 data.hWnd=GetSafeHwnd(); Lw`}o`D  
 strcpy(data.szTip,tip); p~OX1RBI  
 data.uCallbackMessage=IDM_SHELL; f('##pND@  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; pV*d"~T  
 data.uID=98; F]cc?r312  
 Shell_NotifyIcon(NIM_ADD,&data); kH?PEA! \  
 ShowWindow(SW_HIDE); !eP0b~$/^J  
 bTray=TRUE; HpS1(%d"  
} ,15$$3z/E  
zS '{F>w  
void CCaptureDlg::DeleteIcon() ! q+>'Mt  
{ ]CX^!n  
 NOTIFYICONDATA data; -qG7,t  
 data.cbSize=sizeof(NOTIFYICONDATA); 1;HL=F  
 data.hWnd=GetSafeHwnd(); ?f*>=;7=  
 data.uID=98; /w2NO9Q  
 Shell_NotifyIcon(NIM_DELETE,&data); m}t`43}QE  
 ShowWindow(SW_SHOW); vy5I#q(k  
 SetForegroundWindow(); Up*6K=Tny  
 ShowWindow(SW_SHOWNORMAL); S+l>@wa)|  
 bTray=FALSE; 6C!TXV'  
} jF-0fK;)*  
L#fSP  
void CCaptureDlg::OnChange() J]|S0JC`  
{ 3iw. yR  
 RegisterHotkey(); rd^j<  
} gF\ac%9  
9#a/at]  
BOOL CCaptureDlg::RegisterHotkey() 4MRN{W6  
{ 0OBwe6*  
 UpdateData(); A:*$rHbzl  
 UCHAR mask=0; Lbu,VX  
 UCHAR key=0; .jl^"{@6  
 if(m_bControl) !'-./LD")  
  mask|=4; H%;pPkIi  
 if(m_bAlt) Tj=@5lj0  
  mask|=2; PMe3Or@  
 if(m_bShift) =cxG4R1x  
  mask|=1; lr$,=P`  
  key=Key_Table[m_Key.GetCurSel()]; )6 K)UA  
 if(bRegistered){ ?uXY6J"  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ZK8DziO  
  bRegistered=FALSE; :fQN_*B4@4  
 } a KIS%M#Y  
 cMask=mask; 4|NcWpaV7  
 cKey=key; 0$|wj^?U  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); soqnr" 1  
 return bRegistered; wD SSgk  
} i~tps  
`3.bux~  
  四、小结 2G$-:4B  
9HAK  
  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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