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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: Z} 8 m]I  
  [sT}hYh+  
  一、实现方法  h'_@  
1tNmiAu  
  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: HYkZMVH{  
mCY+V~^~kz  
#pragma data_seg("shareddata") 1ukCH\YgU  
HHOOK hHook =NULL; //钩子句柄 'n)]"G|  
UINT nHookCount =0; //挂接的程序数目 %O<  qw  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 [H!8m7i;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 W r%E}mX-  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey iq!u}# x_  
static int KeyCount =0; @4Ox$M  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 n#|pR2  
#pragma data_seg() J:q:g*Wi  
mP?~#RZ  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 o|v_+<zD!  
B[I a8t  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: e{dYLQd  
h 'F\9t  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ny. YkN2  
cKey,UCHAR cMask) 4X5Tyv(Dp  
{ EZ.|6oug\  
 BOOL bAdded=FALSE; y_=},a  
 for(int index=0;index<MAX_KEY;index++){ 6tBh`nYB=  
  if(hCallWnd[index]==0){ MJ )aY2  
   hCallWnd[index]=hWnd; u{-J?t&`  
   HotKey[index]=cKey; YlY3C  
   HotKeyMask[index]=cMask; ]qLro<  
   bAdded=TRUE; ua^gG3n0  
   KeyCount++; . >{.!a  
   break; #z*-  
  } Z\`i~  
 } lR9~LNK?  
 return bAdded; abVz/R/o  
} gUcG#  
//删除热键 : Nf-}"  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?1f(@  
{ NG2@.hP:uU  
 BOOL bRemoved=FALSE; j;|rI`67~  
 for(int index=0;index<MAX_KEY;index++){ f~LM-7!zf}  
  if(hCallWnd[index]==hWnd){ HZ#<+~J  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ f_&bwfbo  
    hCallWnd[index]=NULL; {y[T3(tt  
    HotKey[index]=0; l9%oKJ;  
    HotKeyMask[index]=0; qOV6Kh)  
    bRemoved=TRUE; ^_cR  
    KeyCount--; B[]v[q<  
    break; ?G#T6$E8  
   } 5DHFxym'  
  } Z|z+[V}[  
 } `qjiC>9  
 return bRemoved; pV3o\bk!  
} FTihxC?.L  
jM E==)Y  
1i.t^PY  
  DLL中的钩子函数如下: <R6$ kom`  
;JK !dzi}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <oE(I)r4,  
{ ,DHiM-v  
 BOOL bProcessed=FALSE; 4;*o}E  
 if(HC_ACTION==nCode) Z?vbe}pUM  
 { U(.3[x  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 0;b%@_E  
   switch(wParam) aK%i=6j!  
   {  g]=w_  
    case VK_MENU: GTw3rD^wg  
     MaskBits&=~ALTBIT; (>OCLmV$  
     break; n 2k&yL+a  
    case VK_CONTROL: =]OG5b_-Y  
     MaskBits&=~CTRLBIT; !Ol>![  
     break; pMB~Lt9  
    case VK_SHIFT: 5df~] -=0Y  
     MaskBits&=~SHIFTBIT; {~"&$DY2  
     break; w2!5Cb2  
    default: //judge the key and send message 03iD(,@  
     break; vsjl8L  
   } RaS7IL:e  
   for(int index=0;index<MAX_KEY;index++){ | 'SqG}h  
    if(hCallWnd[index]==NULL) uKI2KWU?2  
     continue; 6QCU:2IiL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `XwFH#_  
    { KT)A{i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); S z3@h"  
     bProcessed=TRUE; FQbF)K~e  
    } 6S;-fj  
   } f$lf(brQ:  
  } Ol,Tw=?  
  else if((lParam&0xc000ffff)==1){ //有键按下 qc*z`Wz:  
   switch(wParam) }}";)}C`  
   { PKT/U^2X]  
    case VK_MENU: 24TQl<H{  
     MaskBits|=ALTBIT;  $)5F3 a|  
     break; L{hP&8$k  
    case VK_CONTROL: K% ) K$/A  
     MaskBits|=CTRLBIT; _?M71>3$.  
     break; 'NM$<<0  
    case VK_SHIFT: +v 9@du  
     MaskBits|=SHIFTBIT; n]/7UH}(<&  
     break; (z}q6Lfa  
    default: //judge the key and send message ~*|0yPFg  
     break; >f [Lb|t  
   }  )"im|9  
   for(int index=0;index<MAX_KEY;index++){ L}bS"=B[&W  
    if(hCallWnd[index]==NULL) ?jywW$   
     continue; !+?,y/*5(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,FvBZ.4c3=  
    { IH;+pN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); AXV+8$ :R  
     bProcessed=TRUE; -Mb`I >=  
    } z@lUaMm:F  
   } R "S,&  
  } Z|YiYQl[)  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 A9_)}  
   for(int index=0;index<MAX_KEY;index++){ j5*W[M9W  
    if(hCallWnd[index]==NULL) ;:JTb2xbb  
     continue; SArSi6vF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5I!EsW$sY  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); vHY."$|H  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 6.z8!4fpl  
   } ]j.??'+rg  
  } \0'7p-T6  
 } sLE@Cm]k  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *&b~cyC  
} "y_A xOH  
&;~x{q]3  
  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: x[Xj[O  
\:cr2w'c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); X\?e=rUfn  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -5Qsc/ s&  
(UDR=7w)  
  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: $7{|  
;><9R@0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6Q&R,"!$p  
{ H7 acT  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) T{1Z(M+  
 { i"}%ib*X  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 y{~l&zrl  
  SaveBmp(); ~/hyf]*j  
  return FALSE; :NL.#!>/  
 } V+/Vk1  
 …… //其它处理及默认处理 T&_!AjH  
} JzA`*X[  
xm@vx}O:  
/n= %#{  
  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。 iyw "|+  
xP<cF  
  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。 {/]Ks8`Dm  
w$~|/UrLf  
  二、编程步骤 $`:/O A<.  
hcEU kD  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; p&w XRI  
S0V%JY;Gv  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; H\tz"<*``  
B_w;2ZuA  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; m^dKww  
-ec ~~95  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; bP%0T++vo  
B;A^5~b  
  5、 添加代码,编译运行程序。 qGtXReK  
=;.#Bds  
三、程序代码 `3!ERQU  
38IVSK_  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL #t /.fd  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 3%Jg' Tr+  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ d[+xLa  
#if _MSC_VER > 1000 sy+o{] N  
#pragma once r40#-A$  
#endif // _MSC_VER > 1000 jHPJk8@y  
#ifndef __AFXWIN_H__ #/'5N|?  
#error include 'stdafx.h' before including this file for PCH sidSY8j  
#endif ar.w'z  
#include "resource.h" // main symbols K'[H`x^  
class CHookApp : public CWinApp Fx']kn9  
{ |t^7L )&y  
 public: 4e d+'-"m  
  CHookApp(); %C*oy$.  
  // Overrides q^],K'  
  // ClassWizard generated virtual function overrides j[ !'l,I  
  //{{AFX_VIRTUAL(CHookApp) {s}@$rW  
 public: wy5vn?T@  
  virtual BOOL InitInstance(); s8T} ah!  
  virtual int ExitInstance(); OHeVm-VC  
  //}}AFX_VIRTUAL @&;y0N1xo  
  //{{AFX_MSG(CHookApp) k~WX6rEJ  
  // NOTE - the ClassWizard will add and remove member functions here. T)Byws  
  // DO NOT EDIT what you see in these blocks of generated code ! [xT2c.2__J  
  //}}AFX_MSG `X8AM=  
  DECLARE_MESSAGE_MAP() ^\kv> WBE  
}; wrq0fHwM  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); /g3U,?qP  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ilvz @=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); oXG,8NOdC  
BOOL InitHotkey(); N%{&%C6{  
BOOL UnInit(); ;+XiDEX0}  
#endif "J(#|v0  
L*tn>AO  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. mBgMu@zt)  
#include "stdafx.h" X$w ,zb\  
#include "hook.h" -:(,<Jt<  
#include <windowsx.h> PdG:aGQ>  
#ifdef _DEBUG Rt{qbM|b&  
#define new DEBUG_NEW 0}]k>ndT  
#undef THIS_FILE W!g'*L/#L  
static char THIS_FILE[] = __FILE__; BgLK}p^  
#endif mT\!LpX  
#define MAX_KEY 100 V2kNJwwk  
#define CTRLBIT 0x04 k WYjqv  
#define ALTBIT 0x02 ~JY<DW7  
#define SHIFTBIT 0x01 0IoS|P}6a  
#pragma data_seg("shareddata") IH?.s k  
HHOOK hHook =NULL; N<ww&GXBX  
UINT nHookCount =0; \k;)m-0bj{  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ou6|;*>d  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT l+S08IZ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ^+cf  
static int KeyCount =0; b@@`2O3"  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 6R% I)  
#pragma data_seg() (NUwkAO M}  
HINSTANCE hins; yjZxD[ Z  
void VerifyWindow(); dE2(PQb*P  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) X"<t3l(+  
//{{AFX_MSG_MAP(CHookApp) `-S6g^Y  
// NOTE - the ClassWizard will add and remove mapping macros here. 0%.l|~CE&  
// DO NOT EDIT what you see in these blocks of generated code! )}\T~#Q]y  
//}}AFX_MSG_MAP +.MHI   
END_MESSAGE_MAP() Gc}d#oo*k  
aloP@U/\Sn  
CHookApp::CHookApp() D^P_3 B+  
{ O [GG<Um  
 // TODO: add construction code here, <\@JbL*  
 // Place all significant initialization in InitInstance h0`@yo  
} uZ*;%y nQ  
niY9`8  
CHookApp theApp; nb0V~W  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) qCOe,$\1/  
{ +avu&2B  
 BOOL bProcessed=FALSE; rwr>43S5<3  
 if(HC_ACTION==nCode) :~BY[")  
 { k0.|%0?K  
  if((lParam&0xc0000000)==0xc0000000){// Key up dC;@ Fn  
   switch(wParam) E`.dU<8HE  
   { Hw[u Sv8  
    case VK_MENU: U}(*}Ut  
     MaskBits&=~ALTBIT; 8)3g!3S  
     break; |RX u O  
    case VK_CONTROL: lCg'K(|"  
     MaskBits&=~CTRLBIT; eZs34${fN  
     break; xS]=WO*  
    case VK_SHIFT: ,o\v umx  
     MaskBits&=~SHIFTBIT; !u@e^J{Ao  
     break; 09pnM|8A  
    default: //judge the key and send message ai[st+1  
     break; WP7*Q:5  
   } 4Y8/>uL  
   for(int index=0;index<MAX_KEY;index++){ 62Yi1<kV@  
    if(hCallWnd[index]==NULL) 9r!psRA:`)  
     continue; <<K GS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) EXUjdJs"  
    { 7a 4G:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Kf D8S  
     bProcessed=TRUE; z 7OTL<h  
    } d(zBd=;  
   } JX@/rXFY}  
  } 37Vs9w  
  else if((lParam&0xc000ffff)==1){ //Key down `~QS3zq  
   switch(wParam) PvX>+y5  
   { sF}T9 Ue  
    case VK_MENU: P#bZtWx'<N  
     MaskBits|=ALTBIT; Jw?J(ig^  
     break; 85YE6^y  
    case VK_CONTROL: UOy9N  
     MaskBits|=CTRLBIT; '+^HeM^;  
     break; Qc-jOl  
    case VK_SHIFT: _] veTAV  
     MaskBits|=SHIFTBIT; oVyOiWo\Z  
     break; l[mXbQd  
    default: //judge the key and send message B/g.bh~)q  
     break; XfmPq'#Z  
   } }-9  
   for(int index=0;index<MAX_KEY;index++) LC)-aw>-  
   { q-O=Em<*  
    if(hCallWnd[index]==NULL) .4pWyqU)!  
     continue; s,O:l0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Q1?  !,a  
    { uFNVV;~RFI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); gtWJR  
     bProcessed=TRUE; 3G|n`dj  
    } pq$`T|6^  
   } 8C3oj  
  } +gh6eY8  
  if(!bProcessed){ 0\84~t'[  
   for(int index=0;index<MAX_KEY;index++){ +G*2f V>  
    if(hCallWnd[index]==NULL) sA=WU(4^  
     continue; =b2/g [  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) tWy0% -  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -v#0.3zm  
   } -R@mnG 5  
  } SbI %|  
 } 8?AFvua}r  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |u{NM1,  
} :it52*3=  
] P;Ng=a  
BOOL InitHotkey() 1*<m,.$  
{ jh \L)a*  
 if(hHook!=NULL){ W3K?K-  
  nHookCount++; Q[J%  
  return TRUE; F[mL_JU  
 } e>\[OwF-x  
 else uuW._$.A>  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ," ~ew ,  
  if(hHook!=NULL) c.y8x  
   nHookCount++; :G\f(2@  
  return (hHook!=NULL); zI77#AUM  
} 8TIc;'bRM  
BOOL UnInit() V uZd  
{ N 0h* |  
 if(nHookCount>1){ 'N#,,d/G  
  nHookCount--; F @ lJk|*_  
  return TRUE; R@Ch3l@  
 } O+hN?/>v  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ^Rriu $\  
 if(unhooked==TRUE){ H7!j5^  
  nHookCount=0; A7,TM&  
  hHook=NULL; R,?7|x  
 } qELy'\  
 return unhooked; k_$:?$  
} ^F/gJ3_;  
`) s]T.-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) fH[Yc>(oj  
{ LRl2@&z<  
 BOOL bAdded=FALSE; ikd~k>F  
 for(int index=0;index<MAX_KEY;index++){ Oo<L~7B  
  if(hCallWnd[index]==0){ g9~>mJR  
   hCallWnd[index]=hWnd; D0NSzCHx  
   HotKey[index]=cKey; HC4qP9Gs  
   HotKeyMask[index]=cMask; x`/"1]Nf  
   bAdded=TRUE; :s|" ZR  
   KeyCount++; |E)-9JSRy  
   break; _Eo$V&  
  } R]hilb'a  
 } G`3/${ti  
 return bAdded; #1c%3KaZ I  
} b`M  2VZu  
$A"C1)d;  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) t/xWJW2  
{ w+c%Y\:  
 BOOL bRemoved=FALSE; ]Q-*xho  
 for(int index=0;index<MAX_KEY;index++){ CtiTXDc_  
  if(hCallWnd[index]==hWnd){ /~RY{ c@#L  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ HX\^ecZ#E  
    hCallWnd[index]=NULL; iOk^RDG+  
    HotKey[index]=0; ;#a^M*e  
    HotKeyMask[index]=0; Bo.< 4P  
    bRemoved=TRUE; znm3b8ns  
    KeyCount--; v%8.o%G  
    break; Bg.~#H  
   } kOi@QLdN  
  } Hg<d%7.  
 } VnqgN  
 return bRemoved; _Ec9g^I10  
} 4 XSEN ]F  
>6xZF'4  
void VerifyWindow() >drG,v0qh  
{ }',/~T6  
 for(int i=0;i<MAX_KEY;i++){ "`;$wA  
  if(hCallWnd!=NULL){ ;VVKn=X=S=  
   if(!IsWindow(hCallWnd)){ :5`=9 _|  
    hCallWnd=NULL; `a *_b9  
    HotKey=0; 7OSk0%Q,  
    HotKeyMask=0; -DWyKR= j"  
    KeyCount--; oT9dMhx8  
   } t2V|moG  
  } w Q!C9Gp3e  
 } 9p| ;Hh:  
} Z{<&2*  
IpX.ube  
BOOL CHookApp::InitInstance() y>4r<Y ZQ  
{ S3Q^K.e?  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); `1;m:,9  
 hins=AfxGetInstanceHandle(); !kAjne8]d  
 InitHotkey(); E8$k}I  
 return CWinApp::InitInstance(); $H}G'LqiG  
} [1Cs  
ry^FJyjW  
int CHookApp::ExitInstance() "9Q @&C  
{ OUoN  
 VerifyWindow(); N$cm;G=]  
 UnInit(); fGK=lT$  
 return CWinApp::ExitInstance(); >iE/t$%1  
} T["(wPrt  
K ?R* )_  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ep|>z#1  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) v[-.]b*5A$  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ tb#9TF  
#if _MSC_VER > 1000 LBO3){=J  
#pragma once \9r1JP0  
#endif // _MSC_VER > 1000 ~=xiMB;oH  
W@"s~I6  
class CCaptureDlg : public CDialog Fog4m=b`g  
{ "gaurr3  
 // Construction $hND!T+;  
 public: ;/hR#>ib  
  BOOL bTray; 8OV;&Z,x  
  BOOL bRegistered; =rH' \7T  
  BOOL RegisterHotkey(); dXwfOC\\  
  UCHAR cKey; o|r8x_!+  
  UCHAR cMask; gzV&S5A{_  
  void DeleteIcon(); xLZJ[:gr  
  void AddIcon(); kBF.TGT[l  
  UINT nCount; +OEheG8  
  void SaveBmp(); 'MF|(`  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^t p6G  
  // Dialog Data (T&rvE  
  //{{AFX_DATA(CCaptureDlg) yiourR)H<  
  enum { IDD = IDD_CAPTURE_DIALOG }; uP;qs8  
  CComboBox m_Key; R ;XG2  
  BOOL m_bControl; by*?PhfF  
  BOOL m_bAlt; V?_:-!NJ(  
  BOOL m_bShift; 3 VNPdXsh  
  CString m_Path; :9nqQJ+~  
  CString m_Number; i -kj6N5  
  //}}AFX_DATA ^a,Oi%  
  // ClassWizard generated virtual function overrides 3mmp5 d  
  //{{AFX_VIRTUAL(CCaptureDlg) ZeB"k)FI>  
 public: WD`z\{hcom  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 45?aV@  
 protected: ^v5v7\!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support P|0dZHpT  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); WR5@S&fU`  
  //}}AFX_VIRTUAL $9~6M*  
  // Implementation |<:Owd=  
 protected: U"SH fI:  
  HICON m_hIcon; ,}8|[)"  
  // Generated message map functions )\xDo<@  
  //{{AFX_MSG(CCaptureDlg) >0^oC[ B  
  virtual BOOL OnInitDialog(); \:7G1_o  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam);  ~OdE!!  
  afx_msg void OnPaint(); -MA/:EB  
  afx_msg HCURSOR OnQueryDragIcon(); 9V]{q  
  virtual void OnCancel(); Vn7FbaO^  
  afx_msg void OnAbout(); E2hy%y9Tp  
  afx_msg void OnBrowse(); NA=I7I@  
  afx_msg void OnChange(); \Uz7ar#,  
 //}}AFX_MSG d3,%Z &  
 DECLARE_MESSAGE_MAP() ~tw#Q  
}; |8m2i1XG  
#endif D]P_tJI  
7,^.h<@K  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file O6 :GE'S  
#include "stdafx.h" lMn1e6~K  
#include "Capture.h" h vC gd^M  
#include "CaptureDlg.h" vOF"p4 ^3  
#include <windowsx.h> V?yTJJ21X  
#pragma comment(lib,"hook.lib") cPx] :sC  
#ifdef _DEBUG s|cL mL[  
#define new DEBUG_NEW 84X/=l-c=  
#undef THIS_FILE By&ibN),  
static char THIS_FILE[] = __FILE__; v@qU<\Y>  
#endif ;$il_xA)\>  
#define IDM_SHELL WM_USER+1 aAT!$0H  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 47/14rY 2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +VE ] .*T  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; { /u}  
class CAboutDlg : public CDialog qD] &&"B  
{ vV(?A  
 public: }=7? & b  
  CAboutDlg(); 2:8p>^g=  
  // Dialog Data SJ ay  
  //{{AFX_DATA(CAboutDlg) t_Q\uo}  
  enum { IDD = IDD_ABOUTBOX }; ~_XK<}SK  
  //}}AFX_DATA h?D>Dfeg%  
  // ClassWizard generated virtual function overrides %U<1]  
  //{{AFX_VIRTUAL(CAboutDlg) &/\Q6$a  
 protected: l- mt{2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support F{'lF^Dc  
  //}}AFX_VIRTUAL NKX,[o1  
  // Implementation be->ofUYgs  
 protected: $FJf8u`  
  //{{AFX_MSG(CAboutDlg) ]cKxYX)J  
  //}}AFX_MSG '{-7%>`bn  
  DECLARE_MESSAGE_MAP() ;A\SbLM  
}; "/#=8_f  
.)Wqo7/Gx  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) .%x1%TN  
{ 0]~'}  
 //{{AFX_DATA_INIT(CAboutDlg) 3hD\6,@  
 //}}AFX_DATA_INIT 9w"kxAN  
}  mS]&  
ge[hAI2I  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 9f|+LN##  
{ F<YXkG4 pO  
 CDialog::DoDataExchange(pDX); ||}'  
 //{{AFX_DATA_MAP(CAboutDlg) =N~*`5|rk  
 //}}AFX_DATA_MAP \LEU reTn  
} g> <*qd?t  
xG7/[ jG  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 5Z<y||=  
 //{{AFX_MSG_MAP(CAboutDlg) 0W6j F5T  
 // No message handlers 5ltrr(MeD  
 //}}AFX_MSG_MAP 8TE2q Pm  
END_MESSAGE_MAP() 0Mo?9??  
}2!=1|}  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) [S:{$4&  
: CDialog(CCaptureDlg::IDD, pParent) ^C|N  
{ @dHQ}Ni  
 //{{AFX_DATA_INIT(CCaptureDlg) ]Jum(1Bo  
  m_bControl = FALSE; >"/Sa_w  
  m_bAlt = FALSE; YD@n8?~$$  
  m_bShift = FALSE; LJ{P93aq`^  
  m_Path = _T("c:\\"); {;2Gl$\r  
  m_Number = _T("0 picture captured."); =[D '3JB  
  nCount=0; 7jzd I!  
  bRegistered=FALSE; P2t9RCH  
  bTray=FALSE; )J>-;EYb8  
 //}}AFX_DATA_INIT "BvAiT{u  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 2zlBrjk;  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); N ,0&xg3  
} ,| Zkpn8  
"0sk(kT  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) !zR1CM  
{ R[bI4|t  
 CDialog::DoDataExchange(pDX); #*zl;h1(  
 //{{AFX_DATA_MAP(CCaptureDlg) b9L" ?{  
  DDX_Control(pDX, IDC_KEY, m_Key); 9l&4mt;+&<  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ;3P~eeQR  
  DDX_Check(pDX, IDC_ALT, m_bAlt); J9V,U;"\  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); D>`lN  
  DDX_Text(pDX, IDC_PATH, m_Path); XPfheV G  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ')82a49eA  
 //}}AFX_DATA_MAP _q1b3)`D  
} Fs 95^T  
d# >iFD+  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 6%\&m|S  
//{{AFX_MSG_MAP(CCaptureDlg) z<jH{AU  
 ON_WM_SYSCOMMAND() lWRRB&8  
 ON_WM_PAINT() F4|U\,g  
 ON_WM_QUERYDRAGICON() U^~jB= =]  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) N_Q\+x}zq  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ]N4?*S*jd)  
 ON_BN_CLICKED(ID_CHANGE, OnChange) JIh:IR(ta  
//}}AFX_MSG_MAP [:"7B&&A  
END_MESSAGE_MAP() S uo  
8Ben}j)H  
BOOL CCaptureDlg::OnInitDialog() 7|Bg--G1  
{ "b `R_gG9  
 CDialog::OnInitDialog(); (O`2$~mIM  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 0w9[Z  
 ASSERT(IDM_ABOUTBOX < 0xF000); )oCb9K:km  
 CMenu* pSysMenu = GetSystemMenu(FALSE);  '.5_L8  
 if (pSysMenu != NULL) 7dq*e4z)  
 { gQ;1SY!  
  CString strAboutMenu; v$]eCj'  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 0NFYFd-50  
  if (!strAboutMenu.IsEmpty()) UgC{  
  { gBPYGci2F  
   pSysMenu->AppendMenu(MF_SEPARATOR); Sf"]enwB  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); w\`u |f;Aq  
  } 2J1YrHj3  
 } G5hh$Nmpi  
 SetIcon(m_hIcon, TRUE); // Set big icon eW/sP Q-  
 SetIcon(m_hIcon, FALSE); // Set small icon n/vKxtW  
 m_Key.SetCurSel(0); FJH'!P\  
 RegisterHotkey(); !W48sZr1&  
 CMenu* pMenu=GetSystemMenu(FALSE); _gn`Y(c$%  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ]`H8r y2  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); TChKm- x  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); V^D!\)#  
 return TRUE; // return TRUE unless you set the focus to a control P;DGs]PF  
} 90[?)s  
& G8tb>q<V  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #Ks2a):8  
{ =1e>$E#  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Y-y<gW  
 { 9yWQ}h  
  CAboutDlg dlgAbout; >j}.~$6dj_  
  dlgAbout.DoModal(); _I A{I  
 } e)): U  
 else d7i 0'R  
 { ITr@;@}c]  
  CDialog::OnSysCommand(nID, lParam); kr{eC/Q"  
 } J{qpGRQNa  
} m)oGeD( !  
M9dOLM.  
void CCaptureDlg::OnPaint() U_l#lGA(H  
{ # *)X+*  
 if (IsIconic()) :}{,u6\  
 { @q<F_'7is  
  CPaintDC dc(this); // device context for painting m |%ly  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); l/:23\  
  // Center icon in client rectangle Ow f:Kife  
  int cxIcon = GetSystemMetrics(SM_CXICON); T/Fj0'  
  int cyIcon = GetSystemMetrics(SM_CYICON); ;lU]ilYv  
  CRect rect; ")i>-1_H  
  GetClientRect(&rect); I] vCra  
  int x = (rect.Width() - cxIcon + 1) / 2; (n {,R  
  int y = (rect.Height() - cyIcon + 1) / 2; hY[Vs5v  
  // Draw the icon :W*']8 M-  
  dc.DrawIcon(x, y, m_hIcon); R0DWjN$j  
 } _=ziw|zI  
 else w\(; >e@  
 { Xn3 \a81  
  CDialog::OnPaint(); , HHCgN  
 } KXvBJA$  
} ReZ&SNJ  
ZgH(,g,TU  
HCURSOR CCaptureDlg::OnQueryDragIcon() s$PPJJT{b  
{ XPd@>2  
 return (HCURSOR) m_hIcon; r.#"he_6!.  
} \9 5O  
Qs1e0LwA9  
void CCaptureDlg::OnCancel() lq*{2M{[  
{ EI!e0 V1!  
 if(bTray) 3V)NM%Aw  
  DeleteIcon(); /+zzZnLl-M  
  CDialog::OnCancel(); 7%F8  
} {ZR>`'^:  
hsEQ6  
void CCaptureDlg::OnAbout() R\^XF8n6/  
{ =*Ru 2  
 CAboutDlg dlg; ._A@,]LS}  
 dlg.DoModal(); ^Z`?mNq9  
} lVR a{._m  
Kh,zp{  
void CCaptureDlg::OnBrowse() 1?hx/02  
{ -er8(snDQ  
 CString str; Yj/[I\I"m  
 BROWSEINFO bi; d@IV@'Q7u  
 char name[MAX_PATH]; ae-hQF&  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); hQPNxpe  
 bi.hwndOwner=GetSafeHwnd(); <WCTJ!Z  
 bi.pszDisplayName=name; 7'1 +i  
 bi.lpszTitle="Select folder"; jt,dr3|/n  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; X\ bXat+  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Uk@'[_1z  
 if(idl==NULL) V3t;V-Lkt  
  return; nLcOz3h  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); K%iA-h  
 str.ReleaseBuffer(); KVA~|j B  
 m_Path=str; AttS?TZr  
 if(str.GetAt(str.GetLength()-1)!='\\') &m8Z3+Ea  
  m_Path+="\\"; D g~L"  
 UpdateData(FALSE); Z @d(0 z  
} B>Xfs ZS  
 V9cKl[  
void CCaptureDlg::SaveBmp() =}^J6+TVL  
{ P{ HYZg  
 CDC dc; [zMnlO  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); +q-/~G'  
 CBitmap bm; K]s*rPT/,  
 int Width=GetSystemMetrics(SM_CXSCREEN); ,"U_oa3  
 int Height=GetSystemMetrics(SM_CYSCREEN); ?D8 +wj  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Eu)(@,]we  
 CDC tdc; 3rh@|fg)E  
 tdc.CreateCompatibleDC(&dc); [t}\8^y  
 CBitmap*pOld=tdc.SelectObject(&bm); `iT{H]po  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); v[J"/:]  
 tdc.SelectObject(pOld); Yv ZcG3@c3  
 BITMAP btm; ~]LkQQ'  
 bm.GetBitmap(&btm); 8\])p sb9  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; &8R !`uh1  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); :,[=g$CT:  
 BITMAPINFOHEADER bih; d]!`II  
 bih.biBitCount=btm.bmBitsPixel; 5?M d  
 bih.biClrImportant=0; 'vc>uY  
 bih.biClrUsed=0; io^ L[  
 bih.biCompression=0; 'j27.Ry.  
 bih.biHeight=btm.bmHeight; H\!p%Y  
 bih.biPlanes=1; m.EIMuj  
 bih.biSize=sizeof(BITMAPINFOHEADER); dw"{inMf  
 bih.biSizeImage=size; rwh,RI) )g  
 bih.biWidth=btm.bmWidth;  5i|DJ6  
 bih.biXPelsPerMeter=0; 2T >K!jS  
 bih.biYPelsPerMeter=0; ~+OAAkJ9  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); G>f2E49BXt  
 static int filecount=0;  tQSJ"Q  
 CString name; j,@@[{tu  
 name.Format("pict%04d.bmp",filecount++); zC<k4[.  
 name=m_Path+name; Lw_s'QNWR  
 BITMAPFILEHEADER bfh; !gbPxfH:6  
 bfh.bfReserved1=bfh.bfReserved2=0; YOE!+MiO  
 bfh.bfType=((WORD)('M'<< 8)|'B'); GX-V|hLaGX  
 bfh.bfSize=54+size; oTLA&dy@  
 bfh.bfOffBits=54; .m/$ku{/J  
 CFile bf; RW I7eC  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #ssSs]zl  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); jS<(O o  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); %f'mW2  
  bf.WriteHuge(lpData,size); E=eK(t(8  
  bf.Close(); noL&>G  
  nCount++; pN?geF~t|  
 } }XcYIo#+t  
 GlobalFreePtr(lpData); Al-;-t#Dc  
 if(nCount==1) YRRsbm{  
  m_Number.Format("%d picture captured.",nCount); {a6cA=WTPd  
 else :Y)jf  
  m_Number.Format("%d pictures captured.",nCount); %3;vDB*L$  
  UpdateData(FALSE); O}w"@gO@.  
} BWG*UjP M  
vA"MTncv  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) D6L5X/#  
{ .0]\a~x  
 if(pMsg -> message == WM_KEYDOWN) X" m0||  
 { *}<Uh'?  
  if(pMsg -> wParam == VK_ESCAPE) 7uq/C#N  
   return TRUE; 8urX]#  
  if(pMsg -> wParam == VK_RETURN) QMAineO  
   return TRUE; 2/F";tc\'  
 } i&_&4  
 return CDialog::PreTranslateMessage(pMsg);  TG^?J`  
} SR8)4:aKW  
Q!*}^W  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |S0nR<x-M  
{ 1~aP)q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ g:rjt1w`D  
  SaveBmp(); F :p9y_W  
  return FALSE; =&~7Q"  
} 9S_PZH  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ U_[<,JE  
 CMenu pop; l2Pry'3  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); aP&bW))CI  
 CMenu*pMenu=pop.GetSubMenu(0); 8gn12._x  
 pMenu->SetDefaultItem(ID_EXITICON); d.3cd40Q  
 CPoint pt; @]F1J  
 GetCursorPos(&pt); l.nd Wv  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); o7i>D6^^  
 if(id==ID_EXITICON) 5x?YFq6k  
  DeleteIcon(); /?*GJN#  
 else if(id==ID_EXIT) w _ONy9  
  OnCancel(); bo|3sN+D  
 return FALSE; w]O [{3"  
} 1Xn:B_pP  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); UI%Z`.&  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) $s]vZ(H  
 AddIcon(); ZULnS*V;5  
 return res; B9(@ .  
} ic;M=dsh:  
OC=g 1  
void CCaptureDlg::AddIcon() dtx3;d<NsJ  
{ X%rsa7H3J  
 NOTIFYICONDATA data; euiP<[|h=  
 data.cbSize=sizeof(NOTIFYICONDATA); !fmbm4!a  
 CString tip; r?2EJE2{V  
 tip.LoadString(IDS_ICONTIP); ,[UK32KWI  
 data.hIcon=GetIcon(0); xNOArb5e5  
 data.hWnd=GetSafeHwnd(); a${<~M hm  
 strcpy(data.szTip,tip); RIdh],-  
 data.uCallbackMessage=IDM_SHELL; +=MN_  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; N> jQe  
 data.uID=98; 67b w[#v  
 Shell_NotifyIcon(NIM_ADD,&data); Q5xQ5Le  
 ShowWindow(SW_HIDE); Ek6z[G` O  
 bTray=TRUE; %5$)w;p.$'  
} 9y+0Zj+.  
38E %]*5F  
void CCaptureDlg::DeleteIcon() ;_p$5GVR|  
{ L.?QZN%cN  
 NOTIFYICONDATA data; ;V0^uB.z  
 data.cbSize=sizeof(NOTIFYICONDATA); W"n0x8~sV  
 data.hWnd=GetSafeHwnd(); <q.Q,_cW  
 data.uID=98; ?>/9ae^Bw  
 Shell_NotifyIcon(NIM_DELETE,&data); 7SJR_G6,{  
 ShowWindow(SW_SHOW); Z_;! f}X  
 SetForegroundWindow(); 8}K^o>J&K  
 ShowWindow(SW_SHOWNORMAL); )lZoXt_3  
 bTray=FALSE; Rn$[P.||  
} {&ykpu090  
l=PZlH y1G  
void CCaptureDlg::OnChange() 0PD=/fh[  
{ m gE r+  
 RegisterHotkey(); ).3riR  
} J!\oH%FJp  
e|}B;<  
BOOL CCaptureDlg::RegisterHotkey() B",;z)(%  
{ z_8lf_N  
 UpdateData(); rU9z? (  
 UCHAR mask=0; ["^? vhv  
 UCHAR key=0; LU $=j  
 if(m_bControl) b.j$Gna>Q  
  mask|=4;  alH6~  
 if(m_bAlt) }0V aZ<j  
  mask|=2; 4w5);x.  
 if(m_bShift) #w@V!o  
  mask|=1; Qo~|[]GE  
  key=Key_Table[m_Key.GetCurSel()]; Ggk#>O G  
 if(bRegistered){ `0, G' F  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); t>! Ok  
  bRegistered=FALSE; mg]t)+PQ  
 } i_(6} Y&  
 cMask=mask; |=js!R|  
 cKey=key; HtV8=.^  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); N 9W,p 2  
 return bRegistered; fSVb.MZa7  
} ykYef  
m+Kl   
  四、小结 (YM2Cv{4  
s}F.D^^G  
  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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