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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: .~rg#*]^  
  9}fez)m:g0  
  一、实现方法 [4dX[  
?`kZ6$  
  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: akCCpnX_d  
swJQwY   
#pragma data_seg("shareddata")  ]EQ*!  
HHOOK hHook =NULL; //钩子句柄 o :4#Ak S  
UINT nHookCount =0; //挂接的程序数目 _E6N*ORV  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 zq?xY`E  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 8$ X3J[_j  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey /?TR_>  
static int KeyCount =0; ;AL:V U  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 @g" vuaG}  
#pragma data_seg() {/aHZ<I&^h  
Vr %ef:uVV  
  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。 1B~Z1w  
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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: \,v+ejhw  
2<w vO 9  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR %AWc`D  
cKey,UCHAR cMask) mZM7 4!4X  
{ ]TcQGW@'  
 BOOL bAdded=FALSE; [io|qLr}\  
 for(int index=0;index<MAX_KEY;index++){ -m ;n}ECg  
  if(hCallWnd[index]==0){ R)isWw4  
   hCallWnd[index]=hWnd; |}<Gz+E>  
   HotKey[index]=cKey;  AKk&  
   HotKeyMask[index]=cMask; HN5,MD[  
   bAdded=TRUE; qFq$a9w|@  
   KeyCount++; `}bvbvmA  
   break; <nN# K{AH  
  } j}(m$j'  
 } 6'<[QoW];  
 return bAdded; =1 S%E  
} Wa&!1' @  
//删除热键 88?O4)c  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )24M?R@r  
{ !gfd!R  
 BOOL bRemoved=FALSE; aS\$@41"  
 for(int index=0;index<MAX_KEY;index++){ tB(~:"|8  
  if(hCallWnd[index]==hWnd){ puMb B9)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ iY&I?o!Ch  
    hCallWnd[index]=NULL; E8p,l>6(f  
    HotKey[index]=0; Mk+G(4p  
    HotKeyMask[index]=0; L$kB(Brw  
    bRemoved=TRUE; SZR`uS  
    KeyCount--; ###>0(n  
    break; 9ZY,T]ym?  
   } M#m;jJqON  
  } N0NFgW;  
 } "J+4  
 return bRemoved; %so{'rQl  
} Qj(ppep\U"  
G\V*j$}!  
&,{YfAxQ`  
  DLL中的钩子函数如下: Jo~fri([%Q  
0!$y]Gr  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3 5L0 CM  
{ iy]?j$B$  
 BOOL bProcessed=FALSE; ]H\tz@ &  
 if(HC_ACTION==nCode) hv\Dz*XTs0  
 { Y| ch ;  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 <l5m\A  
   switch(wParam) Cz9MXb]B  
   {  R-1MD  
    case VK_MENU: mF jM6pmo  
     MaskBits&=~ALTBIT; #reW)P>  
     break; @' ;.$  
    case VK_CONTROL: Aq3\Q>klH)  
     MaskBits&=~CTRLBIT; 6h %rt]g  
     break; wp> z04  
    case VK_SHIFT: 6CW5ay_,  
     MaskBits&=~SHIFTBIT; *vvm8ik  
     break; &`tAQN*Z  
    default: //judge the key and send message 4udj"-V  
     break; urCTP.F  
   } ~{vB2  
   for(int index=0;index<MAX_KEY;index++){ B<,7!:.II  
    if(hCallWnd[index]==NULL) kOq8zYU|  
     continue; >s0![coz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~<s =yjTu+  
    { oDi+\0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 3T4HX|rC  
     bProcessed=TRUE; n&?)gKL0g  
    } +"=ydF.9  
   } A=p'`]Yld  
  } oVPr`]  
  else if((lParam&0xc000ffff)==1){ //有键按下 4neO$^i8J  
   switch(wParam) fBv: TC%  
   { [ K'gvLt1  
    case VK_MENU: k6RVP: V  
     MaskBits|=ALTBIT; P+OS  
     break; ^w<aS w  
    case VK_CONTROL: L/] (pXEp  
     MaskBits|=CTRLBIT; yBIX<P)vE'  
     break; yTZ o4c "  
    case VK_SHIFT: 9|v%bO  
     MaskBits|=SHIFTBIT; }^p<Y5{b  
     break; oM Z94 , 3  
    default: //judge the key and send message W\;|mEEu  
     break; ACZK]~Y'N*  
   } #(i pF  
   for(int index=0;index<MAX_KEY;index++){ ~a&V sC#  
    if(hCallWnd[index]==NULL) FU>KiBV#  
     continue; -)}Z $;1a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C"_ Roir?  
    { h0g?=hJq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~dpf1fP  
     bProcessed=TRUE; Qx8(w"k*  
    } CS(2bj^6 D  
   } .kPNWNrw  
  } gt02Csdt  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 150-'Q  
   for(int index=0;index<MAX_KEY;index++){ 6o(IL-0]c  
    if(hCallWnd[index]==NULL) NRp  
     continue; hwJ>IQ1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =y)K er  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); x|G :;{"+6  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 1;V_E2?V  
   } @DY"~c cH  
  } nw%`CnzT  
 } m_@XoS yxI  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 0< vJ*z|_  
} !Hl]&  
l!&ik9m  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 9!W$S[ABRB  
xy"'8uRi  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $/;K<*O$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Yv@n$W`:  
W ulyM cJ  
  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: bE'{zU}o  
0gaHYqkA>}  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) OWT%XUW=  
{ q` IY;"~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) $[,4Ib_|  
 { Sp:w _;{#  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Rb& 9!z  
  SaveBmp(); <r t$~}  
  return FALSE; +qC [X~\  
 } ] S[?tn  
 …… //其它处理及默认处理  -D'XxOI  
} Bdb}4X rL  
iRlZWgj4^  
Dm5 Uy^F}  
  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。 Y7r;}^+WY  
}l[e@6r F  
  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。 seBmhe5qR  
>Bf3X&uS  
  二、编程步骤 2%`= LGQC  
+,LWyvc'  
  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"; 4_ U"M@  
dgoAaS2M  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; HdB>CVuh  
W.jXO"pN  
  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; }YFM4 0H  
Mh5> hD  
  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; m} s.a.x  
Rk3 bZvj3  
  5、 添加代码,编译运行程序。 f'@ L|&w  
2tpuv(H;  
三、程序代码 C)EP;5k'!\  
A`Y^qXFb`  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL d!0rq4v7  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) .7g h2K  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ WK(X/!1/k  
#if _MSC_VER > 1000 UgS`{&b36  
#pragma once -8Mb~Hfl0  
#endif // _MSC_VER > 1000 Ue >]uZ|  
#ifndef __AFXWIN_H__ rpm\!O  
#error include 'stdafx.h' before including this file for PCH "IT7.!=@9  
#endif %gAT\R_f  
#include "resource.h" // main symbols (b<0=U   
class CHookApp : public CWinApp 7)r]h?  
{ ~a`[p\  
 public: D^US2B  
  CHookApp(); eDZ8F^0  
  // Overrides \?T9 v  
  // ClassWizard generated virtual function overrides C:5- h(#  
  //{{AFX_VIRTUAL(CHookApp) Fw\Z[nh  
 public: . c+m(Pk  
  virtual BOOL InitInstance(); 0ck3II  
  virtual int ExitInstance(); }" vxYB!h3  
  //}}AFX_VIRTUAL Qa )+Tv  
  //{{AFX_MSG(CHookApp) 2WFZ6  
  // NOTE - the ClassWizard will add and remove member functions here. [=q/f2_1.  
  // DO NOT EDIT what you see in these blocks of generated code ! =N\; ?eF(  
  //}}AFX_MSG P{6$".kIY  
  DECLARE_MESSAGE_MAP() Rq5'=L  
}; s~A-qG>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Lxv4w  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U\?D;ABQ%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 49&i];:%7%  
BOOL InitHotkey(); +?o!"SJ  
BOOL UnInit(); uo]xC+^  
#endif JpC=ACF  
TsK!36cg  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. [-_{3qq<e  
#include "stdafx.h" =IsmPQKi  
#include "hook.h" xBTx`+%WS  
#include <windowsx.h> D`a6D  
#ifdef _DEBUG }]o8}$&(  
#define new DEBUG_NEW \~E?;q!  
#undef THIS_FILE H dqB B   
static char THIS_FILE[] = __FILE__; Bc"MOSV0  
#endif Yjc U2S"=P  
#define MAX_KEY 100 7b>_vtrt  
#define CTRLBIT 0x04 [:cD  
#define ALTBIT 0x02 ;kk[x8$  
#define SHIFTBIT 0x01 Intuda7e1  
#pragma data_seg("shareddata") b},2A'X  
HHOOK hHook =NULL; *O~y6|U?  
UINT nHookCount =0; ` 5Kg[nB:  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey y%i9 b&gDd  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Qq`S=:}~x  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey F~ 5,-atDM  
static int KeyCount =0; 3LLG#l )8  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift qS/}aDk&  
#pragma data_seg() 7 mCf*|  
HINSTANCE hins; 5 :IDl1f5  
void VerifyWindow(); I0 ~'z f  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Q /4-7  
//{{AFX_MSG_MAP(CHookApp) Gg'!(]v  
// NOTE - the ClassWizard will add and remove mapping macros here. .T9$O]:o  
// DO NOT EDIT what you see in these blocks of generated code! m1pA]}Y/5o  
//}}AFX_MSG_MAP A,<5W }  
END_MESSAGE_MAP() {wz)^A sy  
,^?g\&f(  
CHookApp::CHookApp() qhxMO[f  
{ hi!A9T3%}M  
 // TODO: add construction code here, ;^xM" {G8  
 // Place all significant initialization in InitInstance $C7a #?YF,  
} f%o[eW#  
HRyFjAR\?  
CHookApp theApp; &Uam4'B6-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) bQautRW  
{ U3a2wK  
 BOOL bProcessed=FALSE; q8d](MaX  
 if(HC_ACTION==nCode) Ow/,pC >V  
 { +fXwbZ?p  
  if((lParam&0xc0000000)==0xc0000000){// Key up aKriO  
   switch(wParam) }g/u.@E  
   { 4)w,gp  
    case VK_MENU: Z|n|gxe  
     MaskBits&=~ALTBIT; r&4Xf# QD6  
     break; =;0-t\w!  
    case VK_CONTROL: q!:dZES  
     MaskBits&=~CTRLBIT; [n[dr@J7v  
     break; R BHDfm'~7  
    case VK_SHIFT: P! +Gwm{  
     MaskBits&=~SHIFTBIT; z;1dMQ,#  
     break; T$D(Y`zdn  
    default: //judge the key and send message ]M*`Y[5"  
     break; I:TbZ*vi~  
   } "Wg,]$IvU  
   for(int index=0;index<MAX_KEY;index++){ :1*E5pX0n  
    if(hCallWnd[index]==NULL) $VHIU1JjZ  
     continue; -orRmn6}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %@vF%   
    { F9j@KC(yg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); tC'E#2  
     bProcessed=TRUE; BwWSztJ+B  
    } MTtx|L\4  
   } )%@7tx  
  } %JE>Z]  
  else if((lParam&0xc000ffff)==1){ //Key down xkDK5&V  
   switch(wParam) \PxT47[@e  
   { N=\ zx^w,  
    case VK_MENU: <4Gy~?  
     MaskBits|=ALTBIT; Nf )YG!  
     break; v=@y7P1  
    case VK_CONTROL: r5~ W/eE  
     MaskBits|=CTRLBIT; @bA5uY!  
     break; -fPiHKJ  
    case VK_SHIFT: 3UUdJh<~  
     MaskBits|=SHIFTBIT; \:J=tAC  
     break; c},pu[nL  
    default: //judge the key and send message 5FR#CQ  
     break; x9 Z89Gwi  
   } XZKlE F?  
   for(int index=0;index<MAX_KEY;index++) {nwoJ'-V  
   { P'qBqx[  
    if(hCallWnd[index]==NULL) L6_%SGY_iE  
     continue; s<{ Hu0K$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V gMgeja  
    { ]_h 3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); j2Dw7"f3  
     bProcessed=TRUE; **h4M2'C  
    } kZG.Id  
   } d MR?pbD  
  } v`,!wS  
  if(!bProcessed){ OlCqv-B2&  
   for(int index=0;index<MAX_KEY;index++){ &qS%~h%2  
    if(hCallWnd[index]==NULL) u$R5Q{H_  
     continue; m*]`/:/X[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) i=#`7pt%'a  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); E\!X$  
   } \~*<[.8~  
  }  "M5  
 } CImp,k0  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); xw9ZRu<z  
} F~6]II  
[cnu K  
BOOL InitHotkey() o>8~rtl  
{ ;<garDf  
 if(hHook!=NULL){ R278^E  
  nHookCount++; N-upNuv  
  return TRUE; [<53_2]~  
 } Eto"B"  
 else OCrTzz8  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); V#w$|2  
  if(hHook!=NULL) _+B y=B.'  
   nHookCount++; P#hRqETw  
  return (hHook!=NULL); h]s6)tI I  
} XA!a^@<H  
BOOL UnInit() 3l?|+sU >O  
{ AT1cN1:4?  
 if(nHookCount>1){ R/v|ZvI  
  nHookCount--; u&I c  
  return TRUE; p*c(dkOe8  
 } N] sbI)Z@  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Z2M(euzfi3  
 if(unhooked==TRUE){ +JtKVF  
  nHookCount=0; ,}IcQu'O  
  hHook=NULL; f`Fj-<v  
 } Acw`ytV  
 return unhooked; u9@B&  
} ,ho",y  
g,\kLTg  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -]0:FKW  
{ CBd%}il  
 BOOL bAdded=FALSE; u9f^wn  
 for(int index=0;index<MAX_KEY;index++){ 16/  V5  
  if(hCallWnd[index]==0){ 06&;GW!-  
   hCallWnd[index]=hWnd; \]<R`YMV  
   HotKey[index]=cKey; h&j2mv(  
   HotKeyMask[index]=cMask; DD=X{{;D\"  
   bAdded=TRUE; ( 3B1X  
   KeyCount++; Em&3g  
   break; 5Hu[*  
  } anW['!T9{s  
 } ~Yd[&vpQ  
 return bAdded; 29J|eBvxx  
} &pzL}/u  
)L9eLxI  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Trs~KcsD  
{ E'\gd7t ;  
 BOOL bRemoved=FALSE; t[q2 W"#.  
 for(int index=0;index<MAX_KEY;index++){ y7UU'k`  
  if(hCallWnd[index]==hWnd){ xH2'PEjFM  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ r7W.}n*  
    hCallWnd[index]=NULL; R7Qj<,  
    HotKey[index]=0; #tKks:eL  
    HotKeyMask[index]=0; :'bZ:J>f  
    bRemoved=TRUE; /}@F q  
    KeyCount--; zY\u" '4  
    break; PFp!T [)  
   } IQ<G .  
  } 9!jF$  
 } I+ |uyc  
 return bRemoved;  d\ #yWY  
} AVjRhe   
9R$$(zB 1;  
void VerifyWindow() m~Pk ]~j  
{ ~:JAWs$\V  
 for(int i=0;i<MAX_KEY;i++){ bji#ID2]%  
  if(hCallWnd!=NULL){ {oY"CZ2  
   if(!IsWindow(hCallWnd)){ >Y4^<!\v  
    hCallWnd=NULL; fh`Y2s|:7R  
    HotKey=0; lknj/i5L  
    HotKeyMask=0; %BC%fVdP  
    KeyCount--; E?+~S M1~  
   } PWS8Dpb  
  } H'3 pHb  
 } S=P}Jpq?Y;  
} Kq")|9=d  
sP^:*B0  
BOOL CHookApp::InitInstance() Jy:*GW6  
{ %6(\Ki6I  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); =k<b* 8  
 hins=AfxGetInstanceHandle(); O;4S<N  
 InitHotkey(); #"6l+}  
 return CWinApp::InitInstance(); Ru`afjc  
} 5*2hTM!  
?:/J8s [O  
int CHookApp::ExitInstance() ]uFJ~ :R  
{ ti GH#~?  
 VerifyWindow(); |rJN  
 UnInit(); o% +w:u.  
 return CWinApp::ExitInstance(); gtH^'vFZ  
} U $#^ e  
2#$7!`6 K  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *1v3x:pQ'  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) s@~3L  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ -}TP)/ !,*  
#if _MSC_VER > 1000 [cDDZ+6  
#pragma once (zsmJe  
#endif // _MSC_VER > 1000 aW:*!d#  
@{qcu\sZ  
class CCaptureDlg : public CDialog H%n/;DW  
{ j6^.Q/{^  
 // Construction ^kK")+K  
 public: *H/)S5  
  BOOL bTray; sB:e:PK  
  BOOL bRegistered; XC6|<pru  
  BOOL RegisterHotkey(); I;jH'._k#  
  UCHAR cKey; br88b`L  
  UCHAR cMask; P}AwE,&Q  
  void DeleteIcon(); JGq9RB]D$  
  void AddIcon(); @8J*vY =e  
  UINT nCount; G?F!Z"S  
  void SaveBmp(); Ke^/aGi}O  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor IrRy1][Qr  
  // Dialog Data "T /$K  
  //{{AFX_DATA(CCaptureDlg) y+BiaD!U  
  enum { IDD = IDD_CAPTURE_DIALOG }; 9*j"@Rm  
  CComboBox m_Key; tPiC?=4R  
  BOOL m_bControl; v89tV9O)  
  BOOL m_bAlt; " xC$Ko _  
  BOOL m_bShift; w\ '5l k,"  
  CString m_Path; W!el[@  
  CString m_Number; G :+D1J]  
  //}}AFX_DATA % }b  
  // ClassWizard generated virtual function overrides vB7]L9=@"  
  //{{AFX_VIRTUAL(CCaptureDlg) w`boQ_Ir  
 public: Y_$!XIJ4  
  virtual BOOL PreTranslateMessage(MSG* pMsg); lz0dt<8eP  
 protected: 8B6(SQp%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support U{EcV%C2  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); oSYJXs  
  //}}AFX_VIRTUAL ]p(es,[  
  // Implementation CA|W4f}  
 protected: /!&eP3^  
  HICON m_hIcon; ?a+J4Zr3  
  // Generated message map functions [EPRBK`=  
  //{{AFX_MSG(CCaptureDlg) 3J4OkwqD  
  virtual BOOL OnInitDialog(); uAYDX<Ja9  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ( q*/=u  
  afx_msg void OnPaint(); .gNJY7`b  
  afx_msg HCURSOR OnQueryDragIcon(); H RahBTd(z  
  virtual void OnCancel(); BpFX e7  
  afx_msg void OnAbout(); ^,'KmZm=  
  afx_msg void OnBrowse(); @pvQci  
  afx_msg void OnChange(); Kk.\P|k2  
 //}}AFX_MSG I&8!V)r)  
 DECLARE_MESSAGE_MAP() N["M "s(N  
}; qzY:>>d'  
#endif 3 P\4K  
J'#o6Ud  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file JvT#Fxjk  
#include "stdafx.h" {IB4%,qT  
#include "Capture.h" P5XUzLV L  
#include "CaptureDlg.h" 1(aib^!B  
#include <windowsx.h> 2CtCG8o  
#pragma comment(lib,"hook.lib") %> YRNW@%  
#ifdef _DEBUG yYJ +vs  
#define new DEBUG_NEW }+NlY D:qF  
#undef THIS_FILE ]*DIn1C^  
static char THIS_FILE[] = __FILE__; &z\?A2Mw%  
#endif $\oe}`#o  
#define IDM_SHELL WM_USER+1 &xj,.;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); AA|G &&1y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9Z2aFW9  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; =;8q`  
class CAboutDlg : public CDialog 4tiCxf)  
{ xjDaA U,  
 public: q/7T-"q/G  
  CAboutDlg(); L{f0r!d|  
  // Dialog Data i[vN3`*B  
  //{{AFX_DATA(CAboutDlg) sZa>+  
  enum { IDD = IDD_ABOUTBOX }; p)7U%NMc(*  
  //}}AFX_DATA Fvv/#V^R  
  // ClassWizard generated virtual function overrides I*+*Wf  
  //{{AFX_VIRTUAL(CAboutDlg) oXwcil  
 protected: jfR!M07|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (=53WbOh/t  
  //}}AFX_VIRTUAL 0oyZlv*  
  // Implementation O,&p"K&Z  
 protected: %[?{H} y  
  //{{AFX_MSG(CAboutDlg) Q `h@-6N  
  //}}AFX_MSG 8 =3#S'n  
  DECLARE_MESSAGE_MAP() [HRP&jr  
}; Xs4G#QsA J  
2c9]Ja3:6  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) L~M6 ca"  
{ Gnqun%  
 //{{AFX_DATA_INIT(CAboutDlg) (j)>npOd9  
 //}}AFX_DATA_INIT P^/e!%UgC  
} w\a9A#v,  
FbPoyh  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) t-hN4WKH_A  
{ !\Q/~p'jS  
 CDialog::DoDataExchange(pDX); Y,%G5X@S<  
 //{{AFX_DATA_MAP(CAboutDlg) #0M,g  
 //}}AFX_DATA_MAP ra\2BS)X  
} &2Cu"O'.i  
JR/^Go$^  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) SI l<\  
 //{{AFX_MSG_MAP(CAboutDlg) q'[yYPDX5x  
 // No message handlers K@=_&A!  
 //}}AFX_MSG_MAP -QydUr/(o  
END_MESSAGE_MAP() 5~omZ,qe  
j98>Jr\  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) u $T'#p1  
: CDialog(CCaptureDlg::IDD, pParent) /#4BUfY f  
{ A.S:eQvS%  
 //{{AFX_DATA_INIT(CCaptureDlg) %$(*.o!+8  
  m_bControl = FALSE; }15ooe%  
  m_bAlt = FALSE; 0'y3iar  
  m_bShift = FALSE; c:`&QDF  
  m_Path = _T("c:\\"); 9y"\]G77E  
  m_Number = _T("0 picture captured."); ?37Kc,o  
  nCount=0; r`=!4vY2  
  bRegistered=FALSE; z9*7fT  
  bTray=FALSE; JMYM}G  
 //}}AFX_DATA_INIT cM+s)4TPL  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 cW, 6 MAQo  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); R$ 40cW3`  
}  ^pZ\:  
=kWm9W<^  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) <j89HtCz  
{ !*|`-woE  
 CDialog::DoDataExchange(pDX); !TuMrA *  
 //{{AFX_DATA_MAP(CCaptureDlg) `Df)wNN1  
  DDX_Control(pDX, IDC_KEY, m_Key); ~%:23mIk  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); DadlCEZv  
  DDX_Check(pDX, IDC_ALT, m_bAlt); !~aDmY 2  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); WAbt8{$D  
  DDX_Text(pDX, IDC_PATH, m_Path); >/F,Z%! &q  
  DDX_Text(pDX, IDC_NUMBER, m_Number); (/l9@0Y.t  
 //}}AFX_DATA_MAP =C2,?6!  
} K1Wiiw  
ijWn,bj  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ,U/ZG|=v  
//{{AFX_MSG_MAP(CCaptureDlg) j'JNQo;q  
 ON_WM_SYSCOMMAND() ul3._Q   
 ON_WM_PAINT() gnSb)!i>z  
 ON_WM_QUERYDRAGICON() {p(.ck ze+  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) liq9P,(  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) N)Z,/w 9  
 ON_BN_CLICKED(ID_CHANGE, OnChange) k@ZmI^  
//}}AFX_MSG_MAP cw{[% 7  
END_MESSAGE_MAP() 6~0. YZ9  
t@EHhiBz  
BOOL CCaptureDlg::OnInitDialog() k GzosUt  
{ :Keek-E`e=  
 CDialog::OnInitDialog(); !pLQRnI}6  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Li_ a|dI  
 ASSERT(IDM_ABOUTBOX < 0xF000); x5}Ru0Z  
 CMenu* pSysMenu = GetSystemMenu(FALSE); m48m5>  
 if (pSysMenu != NULL) 6muZE1sn  
 { ,.<l^sj5  
  CString strAboutMenu; ;M"JN:J8  
  strAboutMenu.LoadString(IDS_ABOUTBOX); J Covk1  
  if (!strAboutMenu.IsEmpty()) 5rpTR  
  { QGnBNsAh  
   pSysMenu->AppendMenu(MF_SEPARATOR); q.>{d%?  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); pTlNJ!U>  
  } thjCfP   
 } \?e{/hXnl  
 SetIcon(m_hIcon, TRUE); // Set big icon @(:M?AO9S.  
 SetIcon(m_hIcon, FALSE); // Set small icon ~vIQ-|8r:  
 m_Key.SetCurSel(0); (1(dL_?  
 RegisterHotkey(); 3Vl?;~ :5  
 CMenu* pMenu=GetSystemMenu(FALSE); jn9KQe\3  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); iWZrZ5l  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); /"$;3n~  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); r4h4A w{  
 return TRUE; // return TRUE unless you set the focus to a control _"B5S?  
} U_HOfix  
bm_'giQ:  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) WL<$(y:H  
{ iIoeG_^*Y  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 4c*?9r@  
 { w QX,a;Br  
  CAboutDlg dlgAbout; Rb~NX  
  dlgAbout.DoModal(); Vn-y<*np  
 } ;V~[kF=t0  
 else ;|f|d?Q\  
 { ^F `   
  CDialog::OnSysCommand(nID, lParam); x 2\ ,n  
 } gSP]& _9j  
} J]A!>|Ic  
-Fe) )Y'=  
void CCaptureDlg::OnPaint() E}d@0C:  
{ {re<S<j&  
 if (IsIconic()) lV-b   
 { `r:n[N=Y&  
  CPaintDC dc(this); // device context for painting {f\/2k3  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); kqfO3{-;{:  
  // Center icon in client rectangle tB_GEt2M  
  int cxIcon = GetSystemMetrics(SM_CXICON); f\}fUg 2  
  int cyIcon = GetSystemMetrics(SM_CYICON); $]eITyC`P  
  CRect rect; Gvk)H$ni  
  GetClientRect(&rect); -# [=1 Y  
  int x = (rect.Width() - cxIcon + 1) / 2; V(|@6ww  
  int y = (rect.Height() - cyIcon + 1) / 2; ^-9g_5  
  // Draw the icon lU0'5!3R,  
  dc.DrawIcon(x, y, m_hIcon); +wU9d8W  
 } mjDaus59  
 else |?=K'[ 5  
 { lr:rQw9  
  CDialog::OnPaint(); -rSp gk0wL  
 } r(W=1e'  
} J2M[aibV  
VFj}{Y  
HCURSOR CCaptureDlg::OnQueryDragIcon() VL5GX (  
{ o.ntzN  
 return (HCURSOR) m_hIcon; [;`B   
} TzT(aWP"  
v"VpE`z1#  
void CCaptureDlg::OnCancel() }j^asuf~c  
{ 82.::J'e  
 if(bTray) J|-X?V;ZW  
  DeleteIcon(); "&s9;_9  
  CDialog::OnCancel(); nCZ&FNi{O~  
} x$o?ckyH  
2 5DXJ b^:  
void CCaptureDlg::OnAbout() ~ [ k0ay  
{ 88]V6Rm9[*  
 CAboutDlg dlg; gJEm  
 dlg.DoModal(); kQ5mIJ9(  
} LD]a!eY  
slC 38  
void CCaptureDlg::OnBrowse() U_t[J|  
{ #1-,s.)  
 CString str; a\60QlAk~  
 BROWSEINFO bi; \&K{v#g ~  
 char name[MAX_PATH]; {Jf["Z  
 ZeroMemory(&bi,sizeof(BROWSEINFO));  uIOnP  
 bi.hwndOwner=GetSafeHwnd(); nKI]f`P7  
 bi.pszDisplayName=name; a:*8SovI  
 bi.lpszTitle="Select folder"; + niz(]  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; A}Q6DHh26  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 1 !N+hf  
 if(idl==NULL) "]1 !<M6\i  
  return; YIjY?  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); f;AQw_{  
 str.ReleaseBuffer(); $]v=2j  
 m_Path=str; CatbEXO  
 if(str.GetAt(str.GetLength()-1)!='\\') $on"@l%U  
  m_Path+="\\"; =hZ#Z]f  
 UpdateData(FALSE); cZB?_[Cp  
} }^!8I7J.  
rucgav  
void CCaptureDlg::SaveBmp() i2]7Bf)oV  
{ |]--sUx:  
 CDC dc; BG>fLp  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); -MEp0  
 CBitmap bm; 1:!_AU?  
 int Width=GetSystemMetrics(SM_CXSCREEN); 6# [  
 int Height=GetSystemMetrics(SM_CYSCREEN); ]S@zhQ  
 bm.CreateCompatibleBitmap(&dc,Width,Height); zSy^vM;6zf  
 CDC tdc; V iY-&q'  
 tdc.CreateCompatibleDC(&dc); `1}WQS  
 CBitmap*pOld=tdc.SelectObject(&bm); aQjs5RbP~  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 05o)Q &`  
 tdc.SelectObject(pOld); :G3PdQb^  
 BITMAP btm; GM_~2Er]  
 bm.GetBitmap(&btm); +rAmy  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; -;NGS )RM  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); t6/w({}j  
 BITMAPINFOHEADER bih; LqNt.d @  
 bih.biBitCount=btm.bmBitsPixel; oeV. K.  
 bih.biClrImportant=0; 63'Rw'g^|2  
 bih.biClrUsed=0; dY=]ES} `  
 bih.biCompression=0; o#GZ|9IL  
 bih.biHeight=btm.bmHeight; k }amSsE  
 bih.biPlanes=1; f4%Z~3P  
 bih.biSize=sizeof(BITMAPINFOHEADER); Z^tTR]u\$  
 bih.biSizeImage=size; *Ubsa9'fS  
 bih.biWidth=btm.bmWidth; 0R2KI,WI  
 bih.biXPelsPerMeter=0; WC& V9Yk  
 bih.biYPelsPerMeter=0; <{ZDD]UGs0  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ltQo_k  
 static int filecount=0; i}u,_ }  
 CString name; bwrM%BL  
 name.Format("pict%04d.bmp",filecount++); #)}K,FDd  
 name=m_Path+name; 7:[u.cd  
 BITMAPFILEHEADER bfh; / thFs4  
 bfh.bfReserved1=bfh.bfReserved2=0; 1SAO6Wh  
 bfh.bfType=((WORD)('M'<< 8)|'B'); C{{RU7iqc&  
 bfh.bfSize=54+size; 4S%s=v w  
 bfh.bfOffBits=54; _3Kow{y\  
 CFile bf; Q y4eDv5  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 6d7E@}<  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 58[=.rzD  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 4d x4hBd  
  bf.WriteHuge(lpData,size); M Ewa^  
  bf.Close(); WK2YHJ*$  
  nCount++; >W?i+,g  
 } g=#Cc( q  
 GlobalFreePtr(lpData); 4{PN9i E  
 if(nCount==1) O)N$nBnp  
  m_Number.Format("%d picture captured.",nCount); .1{:Q1"S  
 else "A( D}~i  
  m_Number.Format("%d pictures captured.",nCount); PiwMl)E|!  
  UpdateData(FALSE); |WkWZZ^  
} V;pR w`  
;AH8/M B9  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) .-Z=Aa>  
{ ZVX1@p  
 if(pMsg -> message == WM_KEYDOWN) u0Q 6 +U  
 { b=L4A,w~a  
  if(pMsg -> wParam == VK_ESCAPE) Z=+Tw!wR>  
   return TRUE; @23?II$=@  
  if(pMsg -> wParam == VK_RETURN) I K9plsd*  
   return TRUE; ?4`f@=}'K  
 } $)YalZ  
 return CDialog::PreTranslateMessage(pMsg); at|.Q*&a#  
} } yb"/jp  
tZXq<k9  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (Sv=R(_s  
{ \sn wR  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ O#_\@f#[  
  SaveBmp(); c9ye[81  
  return FALSE; ge#0Q L0K  
} /4I9Elr  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ "F[e~S#V*  
 CMenu pop; #x+7-hi  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); >b7Yk)[%  
 CMenu*pMenu=pop.GetSubMenu(0); gB<1;_KW  
 pMenu->SetDefaultItem(ID_EXITICON); m2a [ E0  
 CPoint pt; ZGw 6Bd_I  
 GetCursorPos(&pt); %!\iII  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); X :#}E7]j  
 if(id==ID_EXITICON) {^@vCBE+  
  DeleteIcon(); (.J6>"K<  
 else if(id==ID_EXIT) M!`&Z9N  
  OnCancel(); 7VIfRN{5n  
 return FALSE; u<U8LR=)V5  
} !#Pr'm/,mu  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); {EjzJr>  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ,Mr_F^|  
 AddIcon(); 5_\1f|,  
 return res; 1rIL[(r4  
} GU0[K#%  
w-"tA`F4  
void CCaptureDlg::AddIcon() F05]6NVv  
{ 0 wjL=]X1e  
 NOTIFYICONDATA data; eemC;JV%  
 data.cbSize=sizeof(NOTIFYICONDATA); mIe 5{.m#  
 CString tip; dDbH+kqO  
 tip.LoadString(IDS_ICONTIP); **CGkL  
 data.hIcon=GetIcon(0); 03n+kh  
 data.hWnd=GetSafeHwnd(); \nUJ)w  
 strcpy(data.szTip,tip); >:bXw#w]  
 data.uCallbackMessage=IDM_SHELL; TVZf@U  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; +<T361eyY  
 data.uID=98; w5+(A_  
 Shell_NotifyIcon(NIM_ADD,&data); v =_Ds<6n  
 ShowWindow(SW_HIDE); en"\2+{Cg  
 bTray=TRUE; }U^iVq*  
} Xf;_r+;  
mwMcAUD]2  
void CCaptureDlg::DeleteIcon() vX?C9Fr2  
{ d" =)=hm!  
 NOTIFYICONDATA data; )GfL?'Z  
 data.cbSize=sizeof(NOTIFYICONDATA); sB*!Nf^y  
 data.hWnd=GetSafeHwnd(); v'Pbx  
 data.uID=98; 1j]vJ4R_\  
 Shell_NotifyIcon(NIM_DELETE,&data); rMoz+{1A  
 ShowWindow(SW_SHOW); 58t_j54  
 SetForegroundWindow(); *m8{yh  
 ShowWindow(SW_SHOWNORMAL); $WiU oS  
 bTray=FALSE; ^KJi |'B  
} A6 I^`0/  
@8Cja.H  
void CCaptureDlg::OnChange() 4nXemU=  
{ 'Yaq; mDY  
 RegisterHotkey(); V$_.&S?(Y  
} X"V)oC  
Gs>4/  
BOOL CCaptureDlg::RegisterHotkey() !<<wI'8  
{ Jsa;pG=3&  
 UpdateData(); :(K JLa]  
 UCHAR mask=0; 5`6U:MDq  
 UCHAR key=0; gL &)l!2Y  
 if(m_bControl)  e**5_L  
  mask|=4; _Qq lOc9  
 if(m_bAlt) v\g1 w&PN  
  mask|=2; EeQ2\'t  
 if(m_bShift) w0O(>  
  mask|=1; _&M^}||UH  
  key=Key_Table[m_Key.GetCurSel()]; yBCLS550  
 if(bRegistered){ BQ=JZ4&  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); t:P]G>)x|  
  bRegistered=FALSE; f.c2AY~5[  
 } mYqLqezAA  
 cMask=mask; A>f rf[fAW  
 cKey=key; *|^|| bd  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); RS|*3 $1  
 return bRegistered; `Bb32L   
} ~ %Ij5PD  
Z6nQW53-  
  四、小结 FP")$ ,=s  
Q?bC'147O  
  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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