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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: n4ISHxM  
  rC'97`!K  
  一、实现方法 ! _QU-  
Aoj X)_"z  
  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: J9o ]$.e  
%rf<YZ.\  
#pragma data_seg("shareddata") u+-}|  
HHOOK hHook =NULL; //钩子句柄 iM\W"OUl[  
UINT nHookCount =0; //挂接的程序数目 m$U2|5un&  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 wy7f7zIa  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 S2`p&\Ifn  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey cc@y  
static int KeyCount =0; f>Ge Em~  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 f\ Qi()  
#pragma data_seg() (u~@@d"  
O)&V}hU*  
  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。 ?@tp1?)  
EayZ*e ]  
  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: i`X/d=  
Zb@PwH4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR `CRW2^g  
cKey,UCHAR cMask) f- _~rQ  
{ `}18A.K  
 BOOL bAdded=FALSE; d^ w6_  
 for(int index=0;index<MAX_KEY;index++){ xgfK0-T|[  
  if(hCallWnd[index]==0){ zh7NXTzyf  
   hCallWnd[index]=hWnd; O}2;>eH  
   HotKey[index]=cKey; _/hWzj=q  
   HotKeyMask[index]=cMask; oh|Q&R  
   bAdded=TRUE; &kh-2#E  
   KeyCount++; HG{OkDx]fl  
   break; 6m?}oMz  
  } w?Y;pc}1B  
 } h^cM#L^B  
 return bAdded; ?8pRRzV$  
} m#ID%[hg$  
//删除热键 7V?TLGgd$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) wgY: W:y'N  
{ bIR7g(PJ.b  
 BOOL bRemoved=FALSE; Y'0H2B8  
 for(int index=0;index<MAX_KEY;index++){ %A%^;3@  
  if(hCallWnd[index]==hWnd){ Ubv<3syR'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ I vO#tI  
    hCallWnd[index]=NULL; ApR>b%  
    HotKey[index]=0; )ui]vS:>  
    HotKeyMask[index]=0; 5*C#~gd& F  
    bRemoved=TRUE; 4~4D1  
    KeyCount--; > <^ ,  
    break; JZB7?@h%  
   } CKCot  
  } 4YMX;W  
 } G?*)0`~W  
 return bRemoved; T'!7jgk{:  
} t[ cHdI  
22$M6Qof]n  
4J{6Wt";  
  DLL中的钩子函数如下: d#NG]V/   
' >4 H#tu  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )H8Rfn?  
{ Mh3Tfp  
 BOOL bProcessed=FALSE; _TEjB:9eY  
 if(HC_ACTION==nCode) $bOiP  
 { b@`h]]~:  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 (l}W\iB' d  
   switch(wParam) }hRw{#*8  
   {  gaV>WF  
    case VK_MENU: =# 0f4z  
     MaskBits&=~ALTBIT; m9M#)<@*  
     break; m) QV2n  
    case VK_CONTROL: _Fkz^B*  
     MaskBits&=~CTRLBIT; mBN+c9n/  
     break; :8=7)cW  
    case VK_SHIFT: Y].,}}9k  
     MaskBits&=~SHIFTBIT; v(=?@ tF}E  
     break; ;S0Kf{DN2  
    default: //judge the key and send message $Y`oqw?g+^  
     break; (P'{A>aHl0  
   } p4-UW;Xu  
   for(int index=0;index<MAX_KEY;index++){ z* k(` '  
    if(hCallWnd[index]==NULL) YxowArV}uz  
     continue; Cg_9V4h.C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V$0mcwH  
    { lV".-:u_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); [eLMb)n  
     bProcessed=TRUE; ANWfRtiU#  
    } ]}4JT  
   } y~Z7sx0  
  } #fy3 i+  
  else if((lParam&0xc000ffff)==1){ //有键按下 qBF6LhR  
   switch(wParam) /L{V3}[j  
   { vB<9M-sa0  
    case VK_MENU: @B \$ me  
     MaskBits|=ALTBIT; q{Ao j  
     break; &8\6%C  
    case VK_CONTROL: %\^VxM  
     MaskBits|=CTRLBIT; B_mT[)ut  
     break; %-fQ[@5  
    case VK_SHIFT: ?`T Q'#P`  
     MaskBits|=SHIFTBIT; PCx:  
     break; G,!{Q''w  
    default: //judge the key and send message hh!4DHv   
     break; O!se-h5mW8  
   } O\F$~YQ  
   for(int index=0;index<MAX_KEY;index++){ >=1Aa,_tc  
    if(hCallWnd[index]==NULL) #$X _,+<HZ  
     continue; 7bk`u'0%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %0Ibi  
    { Pj8W]SA_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 0oQJ}8t  
     bProcessed=TRUE; w?V;ItcL  
    } 8 qlQC.VA[  
   } )LAG$Cn  
  } #f@}$@  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 .WLwAL  
   for(int index=0;index<MAX_KEY;index++){ {X 5G  
    if(hCallWnd[index]==NULL) Dy&{PeE!  
     continue; jr(|-!RVMN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 6<fcG  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); & LhQr-g  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 '""s%C+  
   } k%R(Qga  
  } l6- n{zG  
 } ` ZBOaN^if  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Ji.FG"h+2  
} l?A~^4(5a/  
|?v .5|1  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: qND:LP\_v  
,zEPdhTX  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); / hg)=p  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'w0?-  
[9d\WPLC  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: K5 EJ#1ov  
87F]a3  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :w]NN\  
{ tzY?LX[3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) =gC% =  
 { _7b4+ L  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 v6H!.0  
  SaveBmp(); MoXai0d%  
  return FALSE; Yyw9IYB;  
 } +TAyCxfmt  
 …… //其它处理及默认处理 f\FqZ?w  
} &oE'|^G  
FE1'MUT_  
5&.I9}[)j  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 Wj8WT)cB  
"pO** z$Z  
  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。 {mY=LaS<  
/]?e^akA  
  二、编程步骤 y Ni3@f  
/8 y v8  
  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"; "EVf1iQ  
\O]kf>nC  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; b\t?5z-Z  
0KZ$v/m  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ]x66/O\0u  
8?rq{&$t  
  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; e0]#vqdO  
+Ht(_+To1  
  5、 添加代码,编译运行程序。 (:^YfG~e  
Rp!"c  
三、程序代码 ol~ tfS  
<?:h(IZe[  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL d6ifJ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) XtE O)  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ $ nMx#~>a  
#if _MSC_VER > 1000 aU/y>Y <k  
#pragma once "([lkn  
#endif // _MSC_VER > 1000 !=HxL-`j  
#ifndef __AFXWIN_H__ wc#k@"2AZb  
#error include 'stdafx.h' before including this file for PCH &XW ~l>!+  
#endif gB>AYL%o=  
#include "resource.h" // main symbols ^Nt^.xi7  
class CHookApp : public CWinApp %TO&  
{ #bCUI*N"P  
 public: ;&!Q N#_  
  CHookApp(); Bat@  
  // Overrides Urol)_3X  
  // ClassWizard generated virtual function overrides ftQ;$@  
  //{{AFX_VIRTUAL(CHookApp) E>:#{%  
 public: EWq < B)  
  virtual BOOL InitInstance(); 4sfq,shRq  
  virtual int ExitInstance(); cEn|Q  
  //}}AFX_VIRTUAL N8,g~?r^  
  //{{AFX_MSG(CHookApp) |,({$TrF  
  // NOTE - the ClassWizard will add and remove member functions here. 9ph>4u(R  
  // DO NOT EDIT what you see in these blocks of generated code ! 99%R/m  
  //}}AFX_MSG Q(R -8"  
  DECLARE_MESSAGE_MAP() MwL!2r  
}; 06`caG|]-M  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); s2F[v:|Wq  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9!0-~,o  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,s 6lB0  
BOOL InitHotkey(); LoSrXK~0~J  
BOOL UnInit(); Q'Uv5p"X  
#endif f3s4aARP  
L>lxkq8!Q  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. /( 9.Fqe(  
#include "stdafx.h" y5?kv-"c  
#include "hook.h" `Gx 5=Bm;  
#include <windowsx.h> Q=Q&\.<  
#ifdef _DEBUG p^Z|$aZZ  
#define new DEBUG_NEW QyrB"_dm  
#undef THIS_FILE 32pPeYxB!-  
static char THIS_FILE[] = __FILE__; oW>e.}d!  
#endif k4en/&  
#define MAX_KEY 100 gt=@v())  
#define CTRLBIT 0x04 Fh&USn"  
#define ALTBIT 0x02 uLfk>&hc  
#define SHIFTBIT 0x01 DYrci?8Ith  
#pragma data_seg("shareddata") KI].T+I  
HHOOK hHook =NULL; QHsJo|.  
UINT nHookCount =0; >u|4490<0  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 8|u8J0^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT #WE lL2&  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey w}M)]kY  
static int KeyCount =0; g6$\i m  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift i&<@}:,  
#pragma data_seg() Yf1%7+V35  
HINSTANCE hins; !u/c'ZLZ>  
void VerifyWindow(); Cd_H<8__  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) J/rF4=j%xy  
//{{AFX_MSG_MAP(CHookApp) R <&U]%FD  
// NOTE - the ClassWizard will add and remove mapping macros here. c0_512  
// DO NOT EDIT what you see in these blocks of generated code! DZ:$p.  
//}}AFX_MSG_MAP DweF8c  
END_MESSAGE_MAP() m6@;!*Y  
1l^ `  
CHookApp::CHookApp() k`\L-*:Ji  
{ er@.<Dc  
 // TODO: add construction code here, >#`{(^  
 // Place all significant initialization in InitInstance YWDd[\4  
} 4KW_#d`t  
-AQ 7Bd  
CHookApp theApp; Shss};QZf(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) I]Z"?T  
{ dO9bxHMnM  
 BOOL bProcessed=FALSE; &$h#9  
 if(HC_ACTION==nCode) R0nUS<b0  
 { qy-Hv6oof  
  if((lParam&0xc0000000)==0xc0000000){// Key up \=(U tro  
   switch(wParam) aq9Ej]1b  
   { hy3?.  
    case VK_MENU: awLSY:JI  
     MaskBits&=~ALTBIT; "msPH<D  
     break; S@ItgG?X  
    case VK_CONTROL: ! OOOc  
     MaskBits&=~CTRLBIT; 1NAtg*`  
     break; +('=Ryo T  
    case VK_SHIFT: 3)l<'~"z<  
     MaskBits&=~SHIFTBIT; [h.i,%Ua"P  
     break; R?:(~ X\  
    default: //judge the key and send message = d!YM6G  
     break; %.:]4jhk  
   } cdg &)  
   for(int index=0;index<MAX_KEY;index++){ H$,wg!kY!  
    if(hCallWnd[index]==NULL) J& D0,cuk  
     continue; ?~;q r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F[X;A\  
    { 1R#1Fy%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); jVSU]LU E  
     bProcessed=TRUE; zKf0 :X  
    } &qm:36Y7Xg  
   } Emv9l~mIu  
  } }jL4F$wC  
  else if((lParam&0xc000ffff)==1){ //Key down `yM9XjEl>  
   switch(wParam) X- SR0x  
   { sv#/78~|  
    case VK_MENU: oho~?.F  
     MaskBits|=ALTBIT; ?1H>k<Jp  
     break; tk+t3+  
    case VK_CONTROL: -B:O0;f  
     MaskBits|=CTRLBIT; zzX9Q:  
     break; k-$J #  
    case VK_SHIFT: w)}@svv"  
     MaskBits|=SHIFTBIT; oN(F$Nvk  
     break; 9YwS"~Q =w  
    default: //judge the key and send message z| zd=3c  
     break; Kxsj_^&|i  
   } U5j0i]  
   for(int index=0;index<MAX_KEY;index++) 4Gsq)i17j  
   { ;Y$d !an0  
    if(hCallWnd[index]==NULL) P}D5 j  
     continue; s1zkkLw`*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zi,":KDz#  
    { R-\"^BV#Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2*0n#" L  
     bProcessed=TRUE; .Mzrj{^Y  
    } dkOERVRe  
   }  83:qIfF  
  } o%v,6yv  
  if(!bProcessed){ Y= ^o {C6  
   for(int index=0;index<MAX_KEY;index++){ 5K|s]Y;  
    if(hCallWnd[index]==NULL) CfHPJ: Qo[  
     continue; &0J/V>k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) N{fYO4O  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); liVDBbS_A?  
   } Y\{lQMCy  
  } 7x`4P|Uu  
 } |r53>,oR<:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^4>Icz^ F  
} s _`y"' ^  
Bh!J&SM:  
BOOL InitHotkey() qAuq2pHA+d  
{ ~Nl`Zmn(A|  
 if(hHook!=NULL){ B4;P)\ 2  
  nHookCount++; 8hvh xp  
  return TRUE; H3q L&xL  
 } PX,fg5s\b  
 else Mer\W6e"e  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); JPS<e*5  
  if(hHook!=NULL) LY(h>`  
   nHookCount++; |c!lZo/  
  return (hHook!=NULL); Z!qF0UDj  
} }ilX 2s?>  
BOOL UnInit() }F (lffb  
{ %b`B.A  
 if(nHookCount>1){ 7)a u#K6  
  nHookCount--; Jl,\^)DSw  
  return TRUE; k3t2{=&'&x  
 } .ZOyZnr Z  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Dv+:d4|"  
 if(unhooked==TRUE){ XY`2>7  
  nHookCount=0; *g/@-6  
  hHook=NULL; JZrUl^8E  
 } AkR ZUj\  
 return unhooked; XvW $B|  
} _fANl}Mf:  
<(-4?"1  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f*~z|  
{ "Q<*H<e  
 BOOL bAdded=FALSE; <x2 F5$@  
 for(int index=0;index<MAX_KEY;index++){ $Uxg$pqO  
  if(hCallWnd[index]==0){ J'y*>dW  
   hCallWnd[index]=hWnd; H[8P]"*z*i  
   HotKey[index]=cKey; tc<t%]c  
   HotKeyMask[index]=cMask; MOW {g\{\  
   bAdded=TRUE; ZI#Xh5  
   KeyCount++; z?8Sie  
   break; "t" &6\  
  } 7 }sj&  
 } ss>?fyA  
 return bAdded; *d/]-JN,K  
}  %;9+`U  
T3 k#6N.  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tC -H2@  
{ C\dlQQ  
 BOOL bRemoved=FALSE; f*SAbDE  
 for(int index=0;index<MAX_KEY;index++){ Af"vSL  
  if(hCallWnd[index]==hWnd){ MhpR^VM'.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ l?%U*~*  
    hCallWnd[index]=NULL; D`^9 u K  
    HotKey[index]=0; L&nGjC+Lr  
    HotKeyMask[index]=0; \W6 |un  
    bRemoved=TRUE; ;"/ "  
    KeyCount--; ".SQ*'Oc  
    break; Sm%MoFf  
   } ]& q mV  
  } C&'Y@GE5  
 } OAQ'/{~7  
 return bRemoved; Zb7:qe<UN  
} jP";ll|c  
+<ey Iw  
void VerifyWindow() lFY;O !Y5\  
{ P!";$]+  
 for(int i=0;i<MAX_KEY;i++){ uv[e0,@  
  if(hCallWnd!=NULL){ ^$y_~z3o#7  
   if(!IsWindow(hCallWnd)){ s"|N-A=cS  
    hCallWnd=NULL; HiG&`:P>q  
    HotKey=0; 'm=9&?0S  
    HotKeyMask=0; "zO+!h'o  
    KeyCount--; <ZNa`  
   } -j9R%+YW<  
  } JPk3T.qp  
 } 1q! 6Sny@  
} !m1pL0  
R@0ELxzA  
BOOL CHookApp::InitInstance() BI=Ie?  
{ hGF(E*  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); F77[fp  
 hins=AfxGetInstanceHandle(); vwzTrWA=  
 InitHotkey(); 8X]j;Rb  
 return CWinApp::InitInstance(); RS/%uxS?  
} 1p&?MxLN-a  
_wf"E(c3D  
int CHookApp::ExitInstance() ,9"</\]`  
{  N _r*Ig  
 VerifyWindow(); h3xX26l  
 UnInit(); {R,rc!yF  
 return CWinApp::ExitInstance(); VPg`vI$(X  
} | _~BV&g,N  
4!6g[[| &J  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file J\   
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) :"O=/p+*Us  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Dl/UZ@8pl  
#if _MSC_VER > 1000 lLtC9:  
#pragma once fC%;|V'Nd  
#endif // _MSC_VER > 1000 n*iaNaU"'  
+U%lWE%  
class CCaptureDlg : public CDialog INzQ0z-z  
{ ~rY<y%K  
 // Construction 8gBqur{  
 public: h/(9AO}t  
  BOOL bTray; hY'"^?OP  
  BOOL bRegistered; ZVIBmx  
  BOOL RegisterHotkey(); HNjkRl)QR  
  UCHAR cKey; W {dx\+  
  UCHAR cMask; p dnL~sv  
  void DeleteIcon(); 05pCgI}F>  
  void AddIcon(); S%xGXmZ  
  UINT nCount; KS(T%mk\  
  void SaveBmp(); a/)TJv  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor (%+DE4?  
  // Dialog Data cS ];?tqrA  
  //{{AFX_DATA(CCaptureDlg) <O\z`aA'q  
  enum { IDD = IDD_CAPTURE_DIALOG }; x=au.@psBS  
  CComboBox m_Key; 'OX6e Y5  
  BOOL m_bControl; ;-]f4O8  
  BOOL m_bAlt; RXx +rdF0  
  BOOL m_bShift; :f/ p5 c  
  CString m_Path; s:]rL&|  
  CString m_Number; x-Mp6  
  //}}AFX_DATA rX{|]M":T  
  // ClassWizard generated virtual function overrides p Y>yJ)  
  //{{AFX_VIRTUAL(CCaptureDlg) >9u6@  
 public: D *LZ_  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ? ! 1uw  
 protected: *iC t4J  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Bxa],inuZ  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); p6HZ2Q:a  
  //}}AFX_VIRTUAL +.lO8  
  // Implementation z ~VA#8>  
 protected: 1  yzxA(  
  HICON m_hIcon; )E[5lD61  
  // Generated message map functions ;D^)^~7dh  
  //{{AFX_MSG(CCaptureDlg) ^c(PZ,/#JB  
  virtual BOOL OnInitDialog(); D 1hKjB&  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~y|%D;  
  afx_msg void OnPaint(); ~hxB Pn."  
  afx_msg HCURSOR OnQueryDragIcon(); "rKIXy  
  virtual void OnCancel(); 4 ^+hw;  
  afx_msg void OnAbout(); pKH4?F  
  afx_msg void OnBrowse(); 5r+0^UAO:J  
  afx_msg void OnChange(); FQ-(#[  
 //}}AFX_MSG 3tm z2JIb  
 DECLARE_MESSAGE_MAP() s?6 7@\  
}; Kq S2  
#endif ,jt098W  
<7jb4n<  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file C3b'Q  
#include "stdafx.h" E%;'3Qykva  
#include "Capture.h" _L=vK=,  
#include "CaptureDlg.h" zhCI+u4/qz  
#include <windowsx.h> %&] }P;&  
#pragma comment(lib,"hook.lib") iP!Y4F  
#ifdef _DEBUG *g,?13Q_  
#define new DEBUG_NEW n5JB'F)  
#undef THIS_FILE qIqk@u  
static char THIS_FILE[] = __FILE__; ILO+=xU  
#endif apMYBbC  
#define IDM_SHELL WM_USER+1 =3zn Ta }  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h#n8mtt&i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); : te xl  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; H3c=B /+  
class CAboutDlg : public CDialog \G=E%aK  
{ ,|4Ye  
 public: hZ'oCRM  
  CAboutDlg(); O\LW 8\M  
  // Dialog Data nfJ8Rt   
  //{{AFX_DATA(CAboutDlg) `HS4(2+C  
  enum { IDD = IDD_ABOUTBOX }; wrO>#`Z  
  //}}AFX_DATA !Q(xOc9>Ug  
  // ClassWizard generated virtual function overrides .#:,j1L"53  
  //{{AFX_VIRTUAL(CAboutDlg) kdUGmR0d  
 protected: pNqf2CnnT  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  hY1|qp  
  //}}AFX_VIRTUAL *QG3Jz  
  // Implementation a`-hLX)~Z  
 protected: NqZRS>60v  
  //{{AFX_MSG(CAboutDlg) XsOOkf\_  
  //}}AFX_MSG VBX# !K1Q  
  DECLARE_MESSAGE_MAP() ii;WmE&  
}; da2[   
FR}H$R7#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |g7h#F~  
{ ~^^ey17   
 //{{AFX_DATA_INIT(CAboutDlg) F3Y>hs):7  
 //}}AFX_DATA_INIT }R1`ThTM  
} @:7gHRJ!  
bJ|?5  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) aVP|:OAj  
{ N4To#Q1w  
 CDialog::DoDataExchange(pDX); 3\KII9  
 //{{AFX_DATA_MAP(CAboutDlg) _=L;`~=C9e  
 //}}AFX_DATA_MAP h6h1.lZ  
} gx*rSS?=N  
&{ {DS  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ` (D4gPW  
 //{{AFX_MSG_MAP(CAboutDlg) ,z1!~gIal  
 // No message handlers LO]6Xd"  
 //}}AFX_MSG_MAP eU koVr   
END_MESSAGE_MAP() #eC;3Kq#-  
CjQ"oQw  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) p? ?/r  
: CDialog(CCaptureDlg::IDD, pParent) u- [t~-(a  
{ tHtV[We.:  
 //{{AFX_DATA_INIT(CCaptureDlg) (L5'rNk  
  m_bControl = FALSE; `XxG"k\/S  
  m_bAlt = FALSE; I/Jp,~JT*  
  m_bShift = FALSE; B#aH\$_U  
  m_Path = _T("c:\\"); cIr1"5POXK  
  m_Number = _T("0 picture captured."); uXLZtfu{  
  nCount=0; +V9B  
  bRegistered=FALSE; *9vA+uN  
  bTray=FALSE; ~B!O~nvdQ  
 //}}AFX_DATA_INIT  |.C    
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 naI v=  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 5Vi]~dZu7  
} y5/6nvH_6  
(s"iC:D6U  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) @%<?GNSO  
{ ~" 0@u  
 CDialog::DoDataExchange(pDX); FxfL+}?Q  
 //{{AFX_DATA_MAP(CCaptureDlg) @vQa\|j  
  DDX_Control(pDX, IDC_KEY, m_Key); `xUG|  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Hl3)R*&'J  
  DDX_Check(pDX, IDC_ALT, m_bAlt); rAx"~l.=  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ~*!u  
  DDX_Text(pDX, IDC_PATH, m_Path); _Dj<Eu_  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Mi}I0yhVm  
 //}}AFX_DATA_MAP D;zWksq  
} ESMG<vW&f  
rer|k<k;]G  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) @ EmGexLPM  
//{{AFX_MSG_MAP(CCaptureDlg) jJVT_8J  
 ON_WM_SYSCOMMAND() 90s;/y(  
 ON_WM_PAINT() +~d1 ;0l|  
 ON_WM_QUERYDRAGICON() %f(S'<DhC  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) w,Z" W;|  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) #%^\\|'z  
 ON_BN_CLICKED(ID_CHANGE, OnChange) e3eVvl5]  
//}}AFX_MSG_MAP t'R':+0Vf  
END_MESSAGE_MAP() {y-2  
!7*(!as  
BOOL CCaptureDlg::OnInitDialog() uxO J3  
{ $_C+4[R?  
 CDialog::OnInitDialog(); rLJ[FqS  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); yGvDn' m  
 ASSERT(IDM_ABOUTBOX < 0xF000); gF[6c`-s  
 CMenu* pSysMenu = GetSystemMenu(FALSE); `l/:NF  
 if (pSysMenu != NULL) u#+RUtM  
 { 8xF)_UV  
  CString strAboutMenu; ATXF,o1  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ^/>Wr'w   
  if (!strAboutMenu.IsEmpty()) TZ_rsj/t  
  { 5vTv$2@  
   pSysMenu->AppendMenu(MF_SEPARATOR); ; 8P_av}C  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 5`{vE4A]q  
  } dEASvD'  
 } 1E8H%2$ V  
 SetIcon(m_hIcon, TRUE); // Set big icon bD35JG^&i  
 SetIcon(m_hIcon, FALSE); // Set small icon ImIqD&a-h  
 m_Key.SetCurSel(0); r6`\d k  
 RegisterHotkey(); ?7 #7:  
 CMenu* pMenu=GetSystemMenu(FALSE); GQN98Y+h  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ]9jZndgC  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); z%V*K  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); )Zas x6`  
 return TRUE; // return TRUE unless you set the focus to a control ; XG]Q<S\  
} iTh xVD  
?g2zmI!U  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Kax#OYLpg  
{ Wo{K}  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) %3M95UZ2  
 { %>Bko,ET  
  CAboutDlg dlgAbout; {Eu'v$c!  
  dlgAbout.DoModal(); .o}%~g<d  
 } 4O!E|/`wO  
 else 2FGx _ Y  
 { vMhYpt?7\  
  CDialog::OnSysCommand(nID, lParam); sAi&A9"*   
 } 2F1ZAl  
} Fn!SGX~kx$  
]:&n-&@L  
void CCaptureDlg::OnPaint() {I{3(M#"  
{ /xySwSmh3  
 if (IsIconic()) e*:}$u8 a  
 { $jG4pPG  
  CPaintDC dc(this); // device context for painting LeSHRoD  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); :uo[&&c  
  // Center icon in client rectangle :.$"kXm^  
  int cxIcon = GetSystemMetrics(SM_CXICON); xuU x4,Z  
  int cyIcon = GetSystemMetrics(SM_CYICON); [ ?iqqG.  
  CRect rect; DLi?'K3t  
  GetClientRect(&rect); t?{B_Bf  
  int x = (rect.Width() - cxIcon + 1) / 2; /b#q*x-b  
  int y = (rect.Height() - cyIcon + 1) / 2; \ZS TKi?  
  // Draw the icon F$Q04Qw  
  dc.DrawIcon(x, y, m_hIcon);  H4:ZTl_$  
 } o.Oq__>$H  
 else \D?:J3H*]  
 { q[ ULG v  
  CDialog::OnPaint(); =&7@<vBpy  
 } QU T"z'  
} l~J*' m2  
SfW}"#L>5  
HCURSOR CCaptureDlg::OnQueryDragIcon() CISO<z0  
{ P~RhUKfd  
 return (HCURSOR) m_hIcon; J 02^i5l  
} `T"rG }c  
eA=WGy@IcN  
void CCaptureDlg::OnCancel() !][F  
{ 3b!,D  
 if(bTray) | o0RP|l  
  DeleteIcon(); |~K(F <;j  
  CDialog::OnCancel(); ^.go O]  
} {38\vX,I(w  
JA^v  
void CCaptureDlg::OnAbout() rh%m;i<b  
{ + E5=$`  
 CAboutDlg dlg; W7=V{}b+  
 dlg.DoModal(); Qi9-z'  
} a#0;==#  
A:# k  
void CCaptureDlg::OnBrowse() "A3dvr  
{ Z4hLdHo_  
 CString str; Vz%OV}\  
 BROWSEINFO bi; w%a8XnW]1  
 char name[MAX_PATH]; t'1Y@e  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); bwiD$  
 bi.hwndOwner=GetSafeHwnd(); U BZ9A  
 bi.pszDisplayName=name; SVWIEH0?  
 bi.lpszTitle="Select folder"; cpZc9;@IC  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; p_2pU)%  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 6bO~/mpWT~  
 if(idl==NULL) 60}! LmL  
  return; 9em*r9-  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \Kav w  
 str.ReleaseBuffer(); T~xwo  
 m_Path=str; ?j O 5 9n  
 if(str.GetAt(str.GetLength()-1)!='\\') 3x@<Z68S  
  m_Path+="\\"; pyZ9OA!PD  
 UpdateData(FALSE); .Y*f2A.v  
} LM)`CELsYc  
NHQF^2\\  
void CCaptureDlg::SaveBmp() G"dS+,Q  
{ (Ddp|a"b  
 CDC dc; F<&!b2)ML  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Vb|#MNf)  
 CBitmap bm; C$yq\C+I  
 int Width=GetSystemMetrics(SM_CXSCREEN); kv{}C)kt3  
 int Height=GetSystemMetrics(SM_CYSCREEN); g);^NAA  
 bm.CreateCompatibleBitmap(&dc,Width,Height); \2C`<h$fN  
 CDC tdc; {QAv~S>4  
 tdc.CreateCompatibleDC(&dc); ,)FdRRj  
 CBitmap*pOld=tdc.SelectObject(&bm); 9N8I ip]w  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *OjKc s  
 tdc.SelectObject(pOld); Nw_@A8-r  
 BITMAP btm; !CTxVLl"F  
 bm.GetBitmap(&btm); Z|lU8`'5  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; c=O,;lWFqm  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); =EP13J  
 BITMAPINFOHEADER bih; z+{,WHjo  
 bih.biBitCount=btm.bmBitsPixel; NAC_pM&B  
 bih.biClrImportant=0; &53]sFZ  
 bih.biClrUsed=0; G3i !PwW  
 bih.biCompression=0; 4u;9J*r4  
 bih.biHeight=btm.bmHeight; 2x]>l? 5b  
 bih.biPlanes=1; D;}xr_  
 bih.biSize=sizeof(BITMAPINFOHEADER); !^oV #  
 bih.biSizeImage=size; ?%tMohL  
 bih.biWidth=btm.bmWidth; Dim> 7Wbh  
 bih.biXPelsPerMeter=0; thlY0XCq,%  
 bih.biYPelsPerMeter=0; b}^S.;vNj  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); F9"w6;hh  
 static int filecount=0; y&~w2{a  
 CString name; G3P &{.v  
 name.Format("pict%04d.bmp",filecount++); }|OaL*|u  
 name=m_Path+name; S0,R_d')  
 BITMAPFILEHEADER bfh; enS}A*Io  
 bfh.bfReserved1=bfh.bfReserved2=0; Jzji&A~  
 bfh.bfType=((WORD)('M'<< 8)|'B'); yOU(2"8p  
 bfh.bfSize=54+size; _9 .(a  
 bfh.bfOffBits=54; 'NjzgZ~]P  
 CFile bf; E51dV:l  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ^FmU_Q0  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); VZr>U*J[:  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); $ i)bq6  
  bf.WriteHuge(lpData,size); ?lGG|9J\  
  bf.Close(); H(c72]@Vg  
  nCount++; }U~6^2 .,  
 } H={DB  
 GlobalFreePtr(lpData); N[]Hc  
 if(nCount==1) >2$5eI  
  m_Number.Format("%d picture captured.",nCount); |:[tNs*,O  
 else ,j;m!V  
  m_Number.Format("%d pictures captured.",nCount); \6n!3FLl  
  UpdateData(FALSE); oBQ#eW aY  
} omO S=d!o  
3`d}~v{  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Ars687WB  
{ [yl sz?  
 if(pMsg -> message == WM_KEYDOWN) LZJA4?C  
 { `g8E1-]l  
  if(pMsg -> wParam == VK_ESCAPE) geQ{EwO8n  
   return TRUE; Wt)Drv{@ {  
  if(pMsg -> wParam == VK_RETURN) S= R7`a<.5  
   return TRUE; t"hYcnC  
 } >EL)X #e  
 return CDialog::PreTranslateMessage(pMsg); iLP7!j  
} PWh^[Rd)  
B]m@:|Q  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p.ANVA@:  
{ UNijFGi  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Qy<[7  
  SaveBmp(); S6}@I ,Q  
  return FALSE; rg0m a  
} Q9I j\HbA"  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ RZM"~ 0  
 CMenu pop; >AoK/(yL.  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 1(|D'y#  
 CMenu*pMenu=pop.GetSubMenu(0); mRB   
 pMenu->SetDefaultItem(ID_EXITICON); 8N:owK  
 CPoint pt; 6x"Q  
 GetCursorPos(&pt); V .os  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); `cPywn@uGZ  
 if(id==ID_EXITICON) `_b`kzJ  
  DeleteIcon(); ;a-$D]Db  
 else if(id==ID_EXIT) 0ye!R   
  OnCancel(); M?=;JJ:  
 return FALSE; xs\!$*R  
} (`SRJ$~f  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 66^ycZCH  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) TKk-;Y=N  
 AddIcon(); Bo<>e~6P  
 return res; 2o>)7^9|#<  
} LL|7rS|o  
;<UWA.  
void CCaptureDlg::AddIcon() Lh.`C7]  
{ ix#epuN  
 NOTIFYICONDATA data; VmzbZTup  
 data.cbSize=sizeof(NOTIFYICONDATA); MxyN\Mq'  
 CString tip; :>p8zG  
 tip.LoadString(IDS_ICONTIP); _+ .\@{c  
 data.hIcon=GetIcon(0); \rVQQ|l   
 data.hWnd=GetSafeHwnd(); w8g,a]p  
 strcpy(data.szTip,tip); a0Ik`8^`  
 data.uCallbackMessage=IDM_SHELL; rDm'Z>nTf  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; s7oT G!  
 data.uID=98; 6a;v&5  
 Shell_NotifyIcon(NIM_ADD,&data); 7}*6#KRG  
 ShowWindow(SW_HIDE); 0i8LWX_M  
 bTray=TRUE; -hkQ2[Ew#  
} ""s]zNF}  
%cE 2s`  
void CCaptureDlg::DeleteIcon() |+`c3*PV  
{ 4%1D}9hO6  
 NOTIFYICONDATA data; ]v#r4Ert  
 data.cbSize=sizeof(NOTIFYICONDATA); wH~kTU2br  
 data.hWnd=GetSafeHwnd(); YC_1Ks  
 data.uID=98; ho>k$s?  
 Shell_NotifyIcon(NIM_DELETE,&data); ~4?9a(>3  
 ShowWindow(SW_SHOW); !"+'A)Nve  
 SetForegroundWindow(); &-5_f* {  
 ShowWindow(SW_SHOWNORMAL); \,J/ r!  
 bTray=FALSE; 8ssJ<LP  
} #GJ dZ  
QXF aAb=(7  
void CCaptureDlg::OnChange() ;/j= Ny{9  
{ t%530EB3  
 RegisterHotkey(); "_2Ng<2  
} W+*5"h  
5s{ABJ\@V  
BOOL CCaptureDlg::RegisterHotkey() gIA@l `"  
{ 0(_l|PScF  
 UpdateData(); 2< hAa9y  
 UCHAR mask=0; =TqQbadp  
 UCHAR key=0; 6rS$yjTX!  
 if(m_bControl) D5~n/.B"  
  mask|=4; nYbhy} y  
 if(m_bAlt) KRjV}\}  
  mask|=2; (|wz7 AY2  
 if(m_bShift) v:+ ~9w+  
  mask|=1; XT;u<aJs  
  key=Key_Table[m_Key.GetCurSel()]; -R{V-   
 if(bRegistered){ si4don  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); M4xi1M#%  
  bRegistered=FALSE; inlk++Og  
 } %7O?JI [  
 cMask=mask; y*MF&mQ[  
 cKey=key; U\rh[0  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); #lU9yv  
 return bRegistered; x1 1U@jd+1  
} _{jjgQJ5  
k? Xc  
  四、小结 HK+/:'P u  
I5h[%T  
  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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