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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: IN9o$CZ:  
  S$I:rbc  
  一、实现方法 DV~1gr,\  
4==Lt Ep  
  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: \ow0Y >  
#TSLgV'U  
#pragma data_seg("shareddata") W(tXq  
HHOOK hHook =NULL; //钩子句柄 aw:0R=S,>  
UINT nHookCount =0; //挂接的程序数目 )p;gm`42oY  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 -0doL ^A  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 .el_pg  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Rx=pk  
static int KeyCount =0; MXhRnVz"W  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 B1Iq:5nmoS  
#pragma data_seg() {N,w5!cP  
way-Q7  
  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。 X_eV<]zA+  
|"Oazll  
  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: MPd#C*c  
/_554q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR G1'w50Yu  
cKey,UCHAR cMask) a[8_ O-   
{ br'/>Un"  
 BOOL bAdded=FALSE; 2'r8#,)  
 for(int index=0;index<MAX_KEY;index++){ _?2xIo  
  if(hCallWnd[index]==0){ GS3ydN<v  
   hCallWnd[index]=hWnd; 2WOdTM{u  
   HotKey[index]=cKey; 7iKbd  
   HotKeyMask[index]=cMask; rbP3&L  
   bAdded=TRUE; yx}Z:t  
   KeyCount++; *lG$B@;rc|  
   break; y!^RL,HIL  
  } U-s6h;^ O  
 } 3^us;aOr  
 return bAdded; qO9_ e  
} o&~z8/?LA  
//删除热键 wEMUr0Hq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) c(AjM9s  
{ {w^flizY  
 BOOL bRemoved=FALSE; V*'9yk"  
 for(int index=0;index<MAX_KEY;index++){ E|Grk  
  if(hCallWnd[index]==hWnd){ `czXjZE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Z y7@"C  
    hCallWnd[index]=NULL; d*,|?Ar*b  
    HotKey[index]=0; %]Nz54!  
    HotKeyMask[index]=0; rd 1&?X  
    bRemoved=TRUE; o#wF/ I  
    KeyCount--; ?I 1@:?Qi  
    break; }Gz"og*8  
   } /HDX[R   
  } ^j=_=Km]  
 } }wkBa]  
 return bRemoved;  5>w>J  
} 1^zF/$%  
gi@+2 7;  
Z9aDE@A  
  DLL中的钩子函数如下: .+B)@?  
g%=\Wiit]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) j4}aK2[<  
{ vFCp= 8h  
 BOOL bProcessed=FALSE; oa1a5+ A  
 if(HC_ACTION==nCode) :WCUHQ+  
 { +dh]k=6  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 >k\*NW  
   switch(wParam) f3l >26  
   {  Ruk6+U  
    case VK_MENU: SqTm/ t  
     MaskBits&=~ALTBIT; ]-fZeyY$  
     break; V`WfJ>{;Z  
    case VK_CONTROL: Z gU;=.  
     MaskBits&=~CTRLBIT; s/To|9D  
     break; FJL9x,%6  
    case VK_SHIFT: Cm ;N5i  
     MaskBits&=~SHIFTBIT; iy: ;g  
     break; iZyk2kc  
    default: //judge the key and send message \K?./*  
     break; "iZ-AG!C  
   } IW BVfN->}  
   for(int index=0;index<MAX_KEY;index++){ ?n@PZL= ]  
    if(hCallWnd[index]==NULL) (%fGS.TR  
     continue; kkOYC?zE?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Mc6Cte]3|  
    { nC&rQQFF  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (x$k\H  
     bProcessed=TRUE; ?I@3`?'  
    } aQ~x$T|  
   } Mm[%v t40  
  } MA-$aN_(  
  else if((lParam&0xc000ffff)==1){ //有键按下 ga~vQ7I_  
   switch(wParam) Zz3#Kt5t3  
   { sy@k3wQ  
    case VK_MENU: bo -Gh`  
     MaskBits|=ALTBIT; y?unI~4tC  
     break; 7T2W% JT-,  
    case VK_CONTROL: "+ Qh,fTt  
     MaskBits|=CTRLBIT; M K[spV  
     break; =0]Mc$Ih  
    case VK_SHIFT: y=j[v},4  
     MaskBits|=SHIFTBIT; bL[PNUG  
     break; Iw<c 9w8  
    default: //judge the key and send message 2\5@_U^)h  
     break; mmKrmM*1  
   } 25 ~$qY_  
   for(int index=0;index<MAX_KEY;index++){ sw@2 ?+  
    if(hCallWnd[index]==NULL) .N+xpxdG,  
     continue; c,~44Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J/=A f [  
    { ]Ns&`Yn{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); < NAR'{f  
     bProcessed=TRUE; BA>0 +  
    } Q)}\4&4  
   } =}"hC`3e  
  } 8 [."%rzN  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 jN<]yhqf  
   for(int index=0;index<MAX_KEY;index++){ QNtr=  
    if(hCallWnd[index]==NULL) bn(Scl#@K  
     continue; ?rK%;GTo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =J'?>-B  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); p.\KmEx  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Q:Ms D.  
   } .6;B3  
  } Z{CL!  
 } jI V? p  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /&|pXBY$;  
} $tKATL*  
:cEe4a  
  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: &Egn`QU  
%7@H7^s}9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); m{5$4v,[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); RQ'c~D)X  
dB,#`tc=,  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: w:LCm `d  
c]n03o  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (hV"z;rI  
{ %i "  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 2Ee1mbZVw8  
 { @/u`7FO$&  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 &e)p6Egl  
  SaveBmp(); 9}mp,egV  
  return FALSE; ,Ex\\p-  
 } E 9:hK  
 …… //其它处理及默认处理 bOdv]nQ1  
} ri;M7rg`.{  
@iceMD.  
4|L@oTzx  
  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。 dtBV0$  
(KMobIP^  
  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。 I7_D $a=  
\xZBu"  
  二、编程步骤 j)DZmGg&t  
wE \c?*k  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; MB 5[Js|  
DQICD.X6R  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; }\{1`$*~  
vTEkh0Ys  
  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; 79x9<,a)  
7x]nY.\  
  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 d$]o0V  
A m1W<`  
  5、 添加代码,编译运行程序。 FlG^'UD  
1c"m$)a4  
三、程序代码 ]e`_.>U  
QX=;,tr  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Kzu9Qm-+z^  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) pi}H.iF  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 5mNXWg7#]  
#if _MSC_VER > 1000 c):*R ]=  
#pragma once 90ag!   
#endif // _MSC_VER > 1000 jq)|7_N  
#ifndef __AFXWIN_H__ <3x#(ms!!  
#error include 'stdafx.h' before including this file for PCH Lx{N%;t*E  
#endif @b{u/:y  
#include "resource.h" // main symbols &FVlTo1  
class CHookApp : public CWinApp hNo>)$v!s  
{ IR8&4qOs  
 public: mO> M=2A  
  CHookApp(); @<=#i  
  // Overrides z=_{jjs  
  // ClassWizard generated virtual function overrides ncr-i!Jjk  
  //{{AFX_VIRTUAL(CHookApp) P/9J!.Cm  
 public: 9y*! W  
  virtual BOOL InitInstance(); 2vN(z %p  
  virtual int ExitInstance(); I{I [N &N  
  //}}AFX_VIRTUAL RbM~E~$  
  //{{AFX_MSG(CHookApp) $)]FCuv  
  // NOTE - the ClassWizard will add and remove member functions here. 2H+DT-hK  
  // DO NOT EDIT what you see in these blocks of generated code ! :t S"sM  
  //}}AFX_MSG `UK+[`E  
  DECLARE_MESSAGE_MAP() Ux T[  
}; L)'rM-nkFh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); PEt8,,x<"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); WN/#9]` P  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); I=y j  
BOOL InitHotkey(); 3F}KrG  
BOOL UnInit(); 5yiiPK$qr  
#endif f1$mh1J W  
:fVMM7  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 'f7 *RSKqb  
#include "stdafx.h" n{r#K_  
#include "hook.h" $ ].k6,%{p  
#include <windowsx.h> G)Bq?=P  
#ifdef _DEBUG o'C.,ic?C  
#define new DEBUG_NEW U hhmG+  
#undef THIS_FILE XWQ0V  
static char THIS_FILE[] = __FILE__; o=# [^Zv  
#endif }cej5/*  
#define MAX_KEY 100 b ]&zDo|8  
#define CTRLBIT 0x04 ?mR[A`J58  
#define ALTBIT 0x02 mh7sY;SvM  
#define SHIFTBIT 0x01 )9*3^v  
#pragma data_seg("shareddata") gNN" H#=2  
HHOOK hHook =NULL; sg"D;b:X  
UINT nHookCount =0; )$h9Y   
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey XJ~l5} y ]  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT nSQ}yqM)  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey lO:{tV  
static int KeyCount =0; &N_c-@2O  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift K!c@aD:#  
#pragma data_seg() eu]iwOc&p  
HINSTANCE hins; ls7A5 <  
void VerifyWindow(); U.7y8#qf3R  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) `N.$LY;8  
//{{AFX_MSG_MAP(CHookApp) {3(.c, q@  
// NOTE - the ClassWizard will add and remove mapping macros here. Z;~[@7`  
// DO NOT EDIT what you see in these blocks of generated code! 9Y%?)t.2  
//}}AFX_MSG_MAP E5BgQ5'  
END_MESSAGE_MAP() 'b?.\Bm;  
y2$;t'  
CHookApp::CHookApp() Cm;qDvj+u  
{ ^+Vk#_2Q  
 // TODO: add construction code here, YQ@6innT  
 // Place all significant initialization in InitInstance J-\?,4mcP  
} RL Zf{Q>  
TWR $D  
CHookApp theApp; _6UAeZ*M  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <I%9O:R  
{ +aw>p_\  
 BOOL bProcessed=FALSE; wV[V#KpX8-  
 if(HC_ACTION==nCode) 4<Sa,~4  
 { 7 Y>`-\  
  if((lParam&0xc0000000)==0xc0000000){// Key up MR_bq_)  
   switch(wParam) /Ej]X`F  
   { MhI)7jj`mt  
    case VK_MENU: -?B9>6 h "  
     MaskBits&=~ALTBIT; JD{MdhhV  
     break; ?6iatI !  
    case VK_CONTROL: _`Q It>R  
     MaskBits&=~CTRLBIT; 0 {JK4]C  
     break; ~d%;~_n  
    case VK_SHIFT: 7Fi2^DlgX  
     MaskBits&=~SHIFTBIT; P b8Z))9j  
     break; 2vkB<[tSs  
    default: //judge the key and send message >6I.%!jU  
     break; 3[=`uO0\7  
   } aR)en{W  
   for(int index=0;index<MAX_KEY;index++){ V9E6W*IE  
    if(hCallWnd[index]==NULL) H[7cA9FI  
     continue; x:?a;muf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) '#N5i  
    { Hg9.<|+yo  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _0W;)v  
     bProcessed=TRUE; |[37:m  
    } p + l_MB  
   } 3U~lI&  
  } O GFE*  
  else if((lParam&0xc000ffff)==1){ //Key down ~` \9Q  
   switch(wParam) y2#>c*  
   { E!I  
    case VK_MENU: {y^|ET7  
     MaskBits|=ALTBIT; )jk1S  
     break; .FKJ yzL  
    case VK_CONTROL: W>0"CUp  
     MaskBits|=CTRLBIT; =`1m-   
     break; B8 0odU&  
    case VK_SHIFT: W~u   
     MaskBits|=SHIFTBIT; PyMVTP4  
     break; `B'4"=(  
    default: //judge the key and send message !rXcGj(k  
     break; >WGP{  
   } P YF.#@":&  
   for(int index=0;index<MAX_KEY;index++) 9y^kb+  
   { !FB \h<6  
    if(hCallWnd[index]==NULL) %Nm @f'  
     continue; l7'{OB L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o3F|#op  
    { ``|gcG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); o'eI(@{F=  
     bProcessed=TRUE; 3Rd`Ysp  
    } *f TG8h  
   } j6e}7  
  } 7rdw`  
  if(!bProcessed){ {x[;5TM  
   for(int index=0;index<MAX_KEY;index++){ ("?&p3];b  
    if(hCallWnd[index]==NULL) ;V~rWzKM(  
     continue; |)-|2cPRur  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) b4v(k(<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); jJUGZVM6)  
   } B [+(r  
  } 1 Itil~  
 } v\ %B  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); rv}mD  
} 6QII&Fg  
9k\)tWe  
BOOL InitHotkey() x7.QL?qR.  
{ Hwp{<  
 if(hHook!=NULL){ (LRM~5KVg  
  nHookCount++; 7$ =Y\ P  
  return TRUE; ~{4n}*  
 } Y$`eg|$  
 else qX5yN| A4  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ;}/U+`=D?  
  if(hHook!=NULL) fVDDYo2\  
   nHookCount++; %AG1oWWc>.  
  return (hHook!=NULL); #v4LoNm  
} *K(k Kph  
BOOL UnInit() +}^|dkc  
{ E.J 0fwyT  
 if(nHookCount>1){ z.3<{-n}0i  
  nHookCount--; ;8ET!&k*>E  
  return TRUE; skIiJ'db  
 } bo@,4xw  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ^kn ^CI6  
 if(unhooked==TRUE){ s.yq}Q  
  nHookCount=0; yB,{#nM>8  
  hHook=NULL; FxCZRo&  
 } 5LX8:~y  
 return unhooked; fB~O |g  
} UvxSMD:A  
'qL5$zG  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !K3})& w  
{ OM.k?1%+M  
 BOOL bAdded=FALSE; p}3NJV  
 for(int index=0;index<MAX_KEY;index++){ o"p^/'ri  
  if(hCallWnd[index]==0){ c,y|c`T 2  
   hCallWnd[index]=hWnd; %MJL5  
   HotKey[index]=cKey; bLgL0}=n  
   HotKeyMask[index]=cMask; MA\m[h]  
   bAdded=TRUE; =)I"wR"v$  
   KeyCount++; 90/vJN  
   break; S!;L F4VA  
  } B<|VeU  
 } mC i[Ps  
 return bAdded; }zFf0.82  
} Y[Q @WdE9  
_1^8xFe2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) mZ~qG5@/F  
{ }I]j&\  
 BOOL bRemoved=FALSE; kE/`n],1U  
 for(int index=0;index<MAX_KEY;index++){ 7J9l.cM3  
  if(hCallWnd[index]==hWnd){ Hm%g_Mt  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ DY9fF4[9a  
    hCallWnd[index]=NULL; |3}5:k  
    HotKey[index]=0; 2fl4h<V  
    HotKeyMask[index]=0; &E bI Op  
    bRemoved=TRUE; 6M ^IwE  
    KeyCount--; Ji;SY{~kv  
    break; ' .B.V?7  
   } Q%ruQ#  
  } vUNisVA  
 } 55.;+B5L *  
 return bRemoved; } h[>U  
} o=pt_!i/  
d%0+i/p  
void VerifyWindow() <i{K7}':  
{ .xO _E1Ku;  
 for(int i=0;i<MAX_KEY;i++){ g"wxC@IR  
  if(hCallWnd!=NULL){ &lAQ &  
   if(!IsWindow(hCallWnd)){ wGvhB%8K  
    hCallWnd=NULL; zJ9v%.e  
    HotKey=0; dUS  ZNY  
    HotKeyMask=0; )QmGsU}?  
    KeyCount--; lT]=&m>  
   } >':5?\C+-  
  } b1u}fp GF  
 } ! ja[ 4.  
} 9UwLF`XM  
8j%'9vPi  
BOOL CHookApp::InitInstance() <FY&h#  
{ x(8n 9Q>  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); >1 @Ltvm  
 hins=AfxGetInstanceHandle(); `)32&\  
 InitHotkey(); BQ#3QL't  
 return CWinApp::InitInstance(); St@l]u9  
} e}A&V+  
t<nFy  
int CHookApp::ExitInstance() c-kA^z{f  
{ e,HMwD  
 VerifyWindow(); wW:7y>z)  
 UnInit(); Wta]BX  
 return CWinApp::ExitInstance(); ~-TOsRvxR  
} 5IW8=$k~.)  
*8bK')W  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file hq#kvvi{f  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) L=O lyHO  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ <l$P&jSF3  
#if _MSC_VER > 1000 Vtb1[cnna  
#pragma once n`(~O O  
#endif // _MSC_VER > 1000 -4w%Iy  
rK1-Mu  
class CCaptureDlg : public CDialog Z!6UW:&~7  
{ _%y4q%#  
 // Construction k[\a)WcY8  
 public: -DP*q3  
  BOOL bTray; r}_lxr  
  BOOL bRegistered; DG(%-w8p"  
  BOOL RegisterHotkey(); 2j&v;dmh<  
  UCHAR cKey; m@jge)O&D  
  UCHAR cMask; !aPD}xCH#  
  void DeleteIcon(); o}8I_o&]U  
  void AddIcon(); pMR,#[U<  
  UINT nCount; _;hf<|c  
  void SaveBmp(); OfTfNhpK  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 5RF4]$zT  
  // Dialog Data ]f8L:=c  
  //{{AFX_DATA(CCaptureDlg) lCJ6Ur;  
  enum { IDD = IDD_CAPTURE_DIALOG }; oFCgu{\kt  
  CComboBox m_Key; _X4!xbP  
  BOOL m_bControl; b9~A-Z  
  BOOL m_bAlt; X32C}4-B  
  BOOL m_bShift; Xc*U+M >U  
  CString m_Path; @PI%FV z~p  
  CString m_Number; |a-fE]{7  
  //}}AFX_DATA &]F3#^!^  
  // ClassWizard generated virtual function overrides 7" 4z+w  
  //{{AFX_VIRTUAL(CCaptureDlg) P(,?#+]-  
 public: \OQkZ.cU;  
  virtual BOOL PreTranslateMessage(MSG* pMsg); A#rh@8h+  
 protected: s$w;q\1z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _Mk7U@j+9  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 7I9aG.;  
  //}}AFX_VIRTUAL =wVJ%  
  // Implementation _{4^|{>Pv  
 protected: zF`3 gl.  
  HICON m_hIcon; :>+\17tx  
  // Generated message map functions k7@t{Cu0D&  
  //{{AFX_MSG(CCaptureDlg) 5'KA'>@  
  virtual BOOL OnInitDialog(); }!p`1]gem  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); DF_X  
  afx_msg void OnPaint(); PL X>-7@  
  afx_msg HCURSOR OnQueryDragIcon(); dY(;]sxFr  
  virtual void OnCancel(); d\]Yk]r  
  afx_msg void OnAbout(); "ZrOrdlg+A  
  afx_msg void OnBrowse(); 0.Ta Xbi  
  afx_msg void OnChange(); i#/]KsSp  
 //}}AFX_MSG nXy>7H[0  
 DECLARE_MESSAGE_MAP() q?):oJ  
}; [sF(#Y:I  
#endif JH8}Ru%Z  
<\ `$Jx#  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file pav'1d%  
#include "stdafx.h" bq>_qpr  
#include "Capture.h" W,XTF  
#include "CaptureDlg.h" >w+HHs/$wK  
#include <windowsx.h> t]aea*B  
#pragma comment(lib,"hook.lib") r [:   
#ifdef _DEBUG X5LBEOG  
#define new DEBUG_NEW #|[ M?3  
#undef THIS_FILE .8(OT./  
static char THIS_FILE[] = __FILE__; 7 aV%=_  
#endif <-'$~G j  
#define IDM_SHELL WM_USER+1 XI<L;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ag-f{UsTy  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H@bf'guA|B  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; nKa$1RMO  
class CAboutDlg : public CDialog 2*w0t:Yx e  
{ 1y#D?R=E  
 public: 3cdTed-MIh  
  CAboutDlg(); a 2 IgC25  
  // Dialog Data ryB}b1`D  
  //{{AFX_DATA(CAboutDlg) f| _u7"OX  
  enum { IDD = IDD_ABOUTBOX }; 5"XC$?I<}  
  //}}AFX_DATA PHOP%hI $  
  // ClassWizard generated virtual function overrides 0k)rc$eDF+  
  //{{AFX_VIRTUAL(CAboutDlg) Q7Iw[=;\  
 protected: fGhn+8VfX  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support GZI`jS"lU  
  //}}AFX_VIRTUAL 'k;rH !R  
  // Implementation s\!>"J bAQ  
 protected: 3?2 FP|G8  
  //{{AFX_MSG(CAboutDlg) oND@:>QBF  
  //}}AFX_MSG I[)%,jd  
  DECLARE_MESSAGE_MAP() mKr h[nA  
}; h2ytS^  
&xRo^iV?  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ) e5 @  
{ Bn@(zHG+5&  
 //{{AFX_DATA_INIT(CAboutDlg) C|pdv  
 //}}AFX_DATA_INIT Xs: 3'ua  
} 8YC_3Yi%  
YIw1  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) [8tL"G6s  
{ vz.>~HBP  
 CDialog::DoDataExchange(pDX); [sB 9gY(  
 //{{AFX_DATA_MAP(CAboutDlg) R2Zgx\VV'  
 //}}AFX_DATA_MAP MxT-1&XL  
} |$?bc3  
_ODbY;M  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ,eTU/Q>{,&  
 //{{AFX_MSG_MAP(CAboutDlg) C74a(Bk}H  
 // No message handlers /c uLc^(X  
 //}}AFX_MSG_MAP lpz2 m\  
END_MESSAGE_MAP() wgCa58H76  
Z#rB}  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) CHe>OreiS  
: CDialog(CCaptureDlg::IDD, pParent) !1e6Ss  
{ d3=KTTi\  
 //{{AFX_DATA_INIT(CCaptureDlg) sI{ M  
  m_bControl = FALSE; phM>.y_  
  m_bAlt = FALSE; |*}4 m'c  
  m_bShift = FALSE; 15o9 .   
  m_Path = _T("c:\\"); ~\J}Kqg  
  m_Number = _T("0 picture captured."); /!c${W!sY  
  nCount=0; j4qJ.i  
  bRegistered=FALSE; %Dwk  
  bTray=FALSE; IiG6<|d8H  
 //}}AFX_DATA_INIT oYukLr  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 [VE8V-  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); :j+ ZI3@  
} @`gk|W3  
h5(4*$%  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) iof-7{+3_  
{ q FAT]{{  
 CDialog::DoDataExchange(pDX); N;\'N ne  
 //{{AFX_DATA_MAP(CCaptureDlg) AvfNwE  
  DDX_Control(pDX, IDC_KEY, m_Key); @3zg=?3  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); !QvZ<5(  
  DDX_Check(pDX, IDC_ALT, m_bAlt); gHo?[pS%y  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ;qm D50:%  
  DDX_Text(pDX, IDC_PATH, m_Path); MdvcnaCG  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 9jw\s P@  
 //}}AFX_DATA_MAP V,cBk  
} p,eTY[k?  
Ft&]7dT{W  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) `\}v#2VJ  
//{{AFX_MSG_MAP(CCaptureDlg) *{L)dW+:  
 ON_WM_SYSCOMMAND() H!$o$}A  
 ON_WM_PAINT() #w' kV#  
 ON_WM_QUERYDRAGICON() [Al&  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) INJEsz  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) cLLbZ=`  
 ON_BN_CLICKED(ID_CHANGE, OnChange) NxsBX :XDn  
//}}AFX_MSG_MAP !wNr3LG  
END_MESSAGE_MAP() 2.l:O2<  
tNbN7yI  
BOOL CCaptureDlg::OnInitDialog() d8c=L8~jt  
{ R^Y <RI  
 CDialog::OnInitDialog(); |&zz,+E  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ee^{hQi  
 ASSERT(IDM_ABOUTBOX < 0xF000); $42{HFGq  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ]?!mS[X  
 if (pSysMenu != NULL) fTK3,s1=  
 { ?`PvL!'  
  CString strAboutMenu; lE4HM$p   
  strAboutMenu.LoadString(IDS_ABOUTBOX); $w`=z<2yo1  
  if (!strAboutMenu.IsEmpty()) =`H@%  
  { 'F9jq  
   pSysMenu->AppendMenu(MF_SEPARATOR); tM'P m   
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); =Jyu4j *}  
  } iMDM1}b  
 } ~kEI4}O  
 SetIcon(m_hIcon, TRUE); // Set big icon uFinv2Z '  
 SetIcon(m_hIcon, FALSE); // Set small icon ~ v|>xqWV  
 m_Key.SetCurSel(0); `u&Rsz&^  
 RegisterHotkey(); @U& QI*  
 CMenu* pMenu=GetSystemMenu(FALSE); #Up86(Z  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Al} B34.uh  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 9,:l8  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); -C(crn  
 return TRUE; // return TRUE unless you set the focus to a control v0H@Eg_  
} 8|l\E VV6  
L?mrba y  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) JehrDC2N  
{ klT@cO-9  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 3 :<WY&9  
 { l*d(;AR  
  CAboutDlg dlgAbout; T?ZRiR)@  
  dlgAbout.DoModal(); n'E(y)9|  
 } pL/DZ|S3  
 else *V8<:OG|e  
 { {tYZt4!{^  
  CDialog::OnSysCommand(nID, lParam); %N>%!m  
 } 2y;Skp  
} N_W}*2(  
@1o/0y"  
void CCaptureDlg::OnPaint() q_MG?re  
{ __G?0*3G  
 if (IsIconic()) &m)6J'q3k  
 { )<h*eS{  
  CPaintDC dc(this); // device context for painting R6;=n"Ueb  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); >4TaP*_  
  // Center icon in client rectangle r\'A i6  
  int cxIcon = GetSystemMetrics(SM_CXICON); nxnv,AZG  
  int cyIcon = GetSystemMetrics(SM_CYICON); W{6|tx)  
  CRect rect; Y 5- F@(  
  GetClientRect(&rect); $5aV:Z3P  
  int x = (rect.Width() - cxIcon + 1) / 2; OR~8sU  
  int y = (rect.Height() - cyIcon + 1) / 2; <lx+/o  
  // Draw the icon &8Cu#^3  
  dc.DrawIcon(x, y, m_hIcon); s(/; U2"e  
 } ^/I 7|u]  
 else < $lCkSx<Q  
 { YNKHN2E8  
  CDialog::OnPaint(); chM%]|gey  
 } :L F?  
} D9^h; 8  
-*Xa3/kQ  
HCURSOR CCaptureDlg::OnQueryDragIcon()  *x@Onj  
{ L*xhGoC=  
 return (HCURSOR) m_hIcon; ;g+N&)n  
}  mHdA2  
i&bA2p3+d  
void CCaptureDlg::OnCancel() S&Zm0Ku  
{ vlmB`T  
 if(bTray) @E7DyU|  
  DeleteIcon(); Z'`<5A%;  
  CDialog::OnCancel(); 0l)~i' '  
} n' n/Tu   
;K:zmH  
void CCaptureDlg::OnAbout() bzBEX mC  
{ 4&<oFW\r  
 CAboutDlg dlg; i [7\[  
 dlg.DoModal(); U)fc*s  
} naG=Pq<  
?+@n3]`0  
void CCaptureDlg::OnBrowse() yVU^M?`#  
{ ]!?;@$wx  
 CString str; e^6)Zz1\  
 BROWSEINFO bi; <wN}X#M  
 char name[MAX_PATH]; Y,<{vLEC  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ]7W&JKmA&  
 bi.hwndOwner=GetSafeHwnd(); :~&~y-14  
 bi.pszDisplayName=name; FH?U(-  
 bi.lpszTitle="Select folder"; \)#kquH/l  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; at#ja_ hd  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ?~BC#B\>o  
 if(idl==NULL) Gw/Pk4R  
  return; S 6@u@C  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 4KhV|#-;k  
 str.ReleaseBuffer(); _mqL8ho  
 m_Path=str; )B"jF>9)[  
 if(str.GetAt(str.GetLength()-1)!='\\') ]sf7{lVT  
  m_Path+="\\"; :%t U'w  
 UpdateData(FALSE); ~7*.6YnI  
} 6iVxc|Ia  
6M @[B|Q(  
void CCaptureDlg::SaveBmp() n4;.W#\  
{ Y2N>HK0  
 CDC dc; Q 3hKk$Y  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); I667Gz$j5  
 CBitmap bm; kJ'!r  
 int Width=GetSystemMetrics(SM_CXSCREEN); :;t:H] f  
 int Height=GetSystemMetrics(SM_CYSCREEN); 0gW"i&7c  
 bm.CreateCompatibleBitmap(&dc,Width,Height); q6McGHT  
 CDC tdc; &N2N6&Ta/  
 tdc.CreateCompatibleDC(&dc); EizKoHI-z  
 CBitmap*pOld=tdc.SelectObject(&bm); + nrbShV  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); l+xX/A)  
 tdc.SelectObject(pOld); %aG5F}S2~  
 BITMAP btm; {j.bC@hWw  
 bm.GetBitmap(&btm); Ec3}_`  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; | k&Ck  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); \(?rQg@U  
 BITMAPINFOHEADER bih; CM/H9Kz.  
 bih.biBitCount=btm.bmBitsPixel; $O&b``  
 bih.biClrImportant=0; 9&-dTayIz  
 bih.biClrUsed=0; Sq>dt[7  
 bih.biCompression=0; cvn@/qBq*t  
 bih.biHeight=btm.bmHeight; "%`1 ]Fr  
 bih.biPlanes=1; dU&a{ $ku[  
 bih.biSize=sizeof(BITMAPINFOHEADER); <Th6r.#?  
 bih.biSizeImage=size; yZ0-wI  
 bih.biWidth=btm.bmWidth; g!g#]9j  
 bih.biXPelsPerMeter=0; jD$,.AVvz  
 bih.biYPelsPerMeter=0; |^&b8  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ?&8^&brwG  
 static int filecount=0; {fPy=,>Nb  
 CString name; C)[,4wt,  
 name.Format("pict%04d.bmp",filecount++); @E&J_un  
 name=m_Path+name; NW~N}5T  
 BITMAPFILEHEADER bfh; so,t   
 bfh.bfReserved1=bfh.bfReserved2=0; ,`'Qi%O  
 bfh.bfType=((WORD)('M'<< 8)|'B'); @6Y?\Wx$w  
 bfh.bfSize=54+size; v [wb~uw\  
 bfh.bfOffBits=54; :}He\V  
 CFile bf; 7x"R3  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ +SP{hHa^  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); nHM~  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); :(/~:^!  
  bf.WriteHuge(lpData,size); VQc_|z_ s  
  bf.Close(); b.2aHu( 3  
  nCount++; "3X2VFwoJ  
 } VACQ+  
 GlobalFreePtr(lpData); &|s0P   
 if(nCount==1) lUOF4U&r  
  m_Number.Format("%d picture captured.",nCount); [T8WThs  
 else }~YA5^VQ$  
  m_Number.Format("%d pictures captured.",nCount); NH[kNi'  
  UpdateData(FALSE); u4t7Ie*Q  
} kYzIp  
)X1{  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) >nJ\BPx  
{ F~,Mw8  
 if(pMsg -> message == WM_KEYDOWN) &Qf/>@ l}  
 { A=$04<nP8!  
  if(pMsg -> wParam == VK_ESCAPE) W>${zVu  
   return TRUE; %^?fMeI|Y  
  if(pMsg -> wParam == VK_RETURN) ui< N[  
   return TRUE; |UkR'Ma  
 } Gt\lFQ  
 return CDialog::PreTranslateMessage(pMsg); a!zz6/q[  
} D#_3^Kiawj  
:NhO2L  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4X!/hI=jq  
{ 7BE>RE=)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ux=w!y;}  
  SaveBmp(); 'j`=if  
  return FALSE; !O\82d1P  
} vDp8__^  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ bg!/%[ {M  
 CMenu pop; W,K;6TZhh  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Ansk,$  
 CMenu*pMenu=pop.GetSubMenu(0); 1$xNUsD2  
 pMenu->SetDefaultItem(ID_EXITICON); R|6Cv3:  
 CPoint pt; M92dZ1+6  
 GetCursorPos(&pt); tZ]?^_Y1  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); / kF)  
 if(id==ID_EXITICON) 8V~k5#&Ow  
  DeleteIcon(); Cz9xZA{[M  
 else if(id==ID_EXIT) ,kyJAju>  
  OnCancel(); $jjfC  
 return FALSE; p\Q5,eg  
} W/=.@JjI  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ayn)5q/z  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) :">!r.Q  
 AddIcon(); Uf1!qP/H?  
 return res; [zH:1Zhl&  
} R}-(cc%5  
4zXFuTr($  
void CCaptureDlg::AddIcon() aHV;N#Lx3  
{ 3(="YbZ  
 NOTIFYICONDATA data; qz"}g/;?  
 data.cbSize=sizeof(NOTIFYICONDATA); xipU8'ac/  
 CString tip; Jz\%%C  
 tip.LoadString(IDS_ICONTIP); '*Z1tDFS  
 data.hIcon=GetIcon(0); S.mG?zbw  
 data.hWnd=GetSafeHwnd(); -z ID x  
 strcpy(data.szTip,tip); @bi}W`  
 data.uCallbackMessage=IDM_SHELL; ;dkYf24  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1D7nkAy  
 data.uID=98; WltQ63u  
 Shell_NotifyIcon(NIM_ADD,&data); xzdf^Ce  
 ShowWindow(SW_HIDE); GF"hx`zyJ  
 bTray=TRUE; {dhXIs  
} _:ReN_0  
-Fi`Z$  
void CCaptureDlg::DeleteIcon() Wvq27YK'  
{ ^-TE([bW  
 NOTIFYICONDATA data; o8 IL $:  
 data.cbSize=sizeof(NOTIFYICONDATA); WO7z  
 data.hWnd=GetSafeHwnd(); )!3V/`I  
 data.uID=98; M-$%Rzl_  
 Shell_NotifyIcon(NIM_DELETE,&data); u0}vWkn\4  
 ShowWindow(SW_SHOW); L 8c0lx}Nn  
 SetForegroundWindow(); sG(~^hJ_  
 ShowWindow(SW_SHOWNORMAL); 9Uh"iMB  
 bTray=FALSE; g1;:KzVv  
} /Y/UM3/  
u]g%@3Pn  
void CCaptureDlg::OnChange() )1Y{Q Y}l  
{ *1ilkmL%  
 RegisterHotkey(); >,v`EIg  
} eln)BW#  
HSw;^E)1  
BOOL CCaptureDlg::RegisterHotkey() [ZNtCnv  
{ FVMD>=k  
 UpdateData(); /{EP*,/*  
 UCHAR mask=0; E`kG-Q5Dw  
 UCHAR key=0; '@a}H9>}  
 if(m_bControl) U2ohHJ``  
  mask|=4; 6gkV*|U,e  
 if(m_bAlt) B*eC3ok3z  
  mask|=2; _no/F2>!/n  
 if(m_bShift) FXpJqlhNv  
  mask|=1; TCMCK_SQL  
  key=Key_Table[m_Key.GetCurSel()]; +Te\H  
 if(bRegistered){ TeMHm ?1^  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); <!&[4-;fU  
  bRegistered=FALSE; HNb/-e ,"  
 } S%$ }(  
 cMask=mask; ^8]NxV@l  
 cKey=key; z$&{:\hj  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); aKJwofD  
 return bRegistered; L{#IT.  
} %gInje  
/RG:W0=K  
  四、小结 <h!_>:2L  
=R^%(Py  
  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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