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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: LK)0g4{  
  #3f\,4K5  
  一、实现方法 \\Fl,'  
r8pTtf#Q  
  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: ?9i 7w1`  
sX^m1v~N|  
#pragma data_seg("shareddata") RYZh"1S;k  
HHOOK hHook =NULL; //钩子句柄 /<\>j+SC  
UINT nHookCount =0; //挂接的程序数目 w*eO9k  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ]Z&2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 IwiR2K  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey .zAB)rNc |  
static int KeyCount =0; 1X.5cl?V  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 aqK<}jy  
#pragma data_seg() S6*3."Sk  
;Bd0 =C  
  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。 r%}wPN(?D  
#5-0R7\d7  
  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: .\7R/cP}{A  
~raRIh=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ygW,4Vz7J  
cKey,UCHAR cMask) =q.2S; ?  
{ B- N  
 BOOL bAdded=FALSE; AA:Ch?  
 for(int index=0;index<MAX_KEY;index++){ g|a2z_R  
  if(hCallWnd[index]==0){ <*<7p{x  
   hCallWnd[index]=hWnd; t \kI( G  
   HotKey[index]=cKey; w4<RV:Vmt  
   HotKeyMask[index]=cMask; XsQ?&xK=u  
   bAdded=TRUE; n9B1NM5 \  
   KeyCount++; -\:pbR  
   break; .Vj;[p8  
  } 6=3}gd5  
 } osB[KRT>("  
 return bAdded; ~vy_~|6s  
} f>g>7OsD]  
//删除热键 B5hk]=Ud  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,9^wKS!7$  
{ P PZxH}J.  
 BOOL bRemoved=FALSE; n{J<7I e"*  
 for(int index=0;index<MAX_KEY;index++){ o}mD1q0yE  
  if(hCallWnd[index]==hWnd){ "<SK=W  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Xhe25  
    hCallWnd[index]=NULL; MR=>DcR  
    HotKey[index]=0; zHw[`"[  
    HotKeyMask[index]=0; #(FG+Bk  
    bRemoved=TRUE; +e. bO5Y  
    KeyCount--; r in#lu& N  
    break; &]iX>m.  
   } o /AEp)8  
  } qiV#T +\  
 } -)(HG)3  
 return bRemoved; uli,@5%\  
} |XzqP +t  
u~=>$oT't  
*q{/`Z{wy  
  DLL中的钩子函数如下: g!(j.xe  
ZMQSy7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) DJr{;t$7~  
{ {wiw]@c8  
 BOOL bProcessed=FALSE; !U>711$  
 if(HC_ACTION==nCode) v?F~fRH  
 { 6H\3  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 .-T^ S"`d|  
   switch(wParam) LSv0zAIe/  
   {  j y R 9a!  
    case VK_MENU: J b Hn/$  
     MaskBits&=~ALTBIT; NdZv*  
     break; "yxIaTZu  
    case VK_CONTROL: @jAuSBy  
     MaskBits&=~CTRLBIT; m{gx\a.5  
     break; % zHsh  
    case VK_SHIFT: @{\q1J>  
     MaskBits&=~SHIFTBIT; 1Rc'2Y  
     break; `ySLic`  
    default: //judge the key and send message zFmoo4P/  
     break; RNE} )B  
   } f8'D{OP"G  
   for(int index=0;index<MAX_KEY;index++){ r%A-  
    if(hCallWnd[index]==NULL) ^$c+r%9k  
     continue; )"s <hR ,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eL[BH8l  
    { ,d'x]&a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 7Rqjf6kX`O  
     bProcessed=TRUE; s|.V:%9e  
    } N1`/~Gi  
   } H]K(`)y}4  
  } )<-\ F%&b  
  else if((lParam&0xc000ffff)==1){ //有键按下 k;/U6,LQ*  
   switch(wParam) @JVax-N  
   { 6 6WAD$8$  
    case VK_MENU: Ll\y2oJ  
     MaskBits|=ALTBIT; Ytop=ZIl'  
     break; g+|1khS)  
    case VK_CONTROL: CKeT%3  
     MaskBits|=CTRLBIT; '+LC.lM  
     break; tYK 5?d  
    case VK_SHIFT: ZG+8kt!w  
     MaskBits|=SHIFTBIT; }t#uSz^  
     break; FWcE\;%yVg  
    default: //judge the key and send message {{w5F2b((%  
     break; gBGUGjVj  
   } %/NB263Db  
   for(int index=0;index<MAX_KEY;index++){ }w ^Hm3Y^&  
    if(hCallWnd[index]==NULL) ^3 C8GzOsO  
     continue; ya8MjGo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W;en7v;#I}  
    { =S7Xj`/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); PRcW}"m]Qg  
     bProcessed=TRUE; %H Pwu &  
    } ~'k.'O{  
   } musZCg$  
  } ")LcB' C  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 + pTc2z  
   for(int index=0;index<MAX_KEY;index++){ [Zc8tE2oN  
    if(hCallWnd[index]==NULL) U[1Rw6  
     continue; Ze_4MwC W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) w'E&w)Z]  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); S)ZcH  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ;5QdT{$H  
   } Ry9kGdqO  
  } CmKbpN*  
 } jz;N&62|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 1{{z[w#  
} 2 ZW {  
NN\>( =  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Dz4e.tvN  
tGv5pe*r  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Tl>D=Vnhh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .&fG_(6|  
ErmlM#u  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 5'=\$Ob  
[vCZoG8+>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %X)w$}WH  
{ P]w5`aBM  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) "X<vgM^:  
 { 6z (7l  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ObJgJr  
  SaveBmp(); %<c2jvn+k  
  return FALSE; m X2i^.zH  
 } ! f!/~M"!  
 …… //其它处理及默认处理 L[;U Z)V@  
} 2loy4f  
h$ ]=z\=  
l12Pj02w  
  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。 +P YX.  
mcbvB5U  
  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。 =GH>-*qp  
((OQs.  
  二、编程步骤 /o@6? UH  
W.u+R?a=  
  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"; xv|?;Zf6w  
x~3N})T5  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ;\1/4;m  
K[{hh;7  
  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; !V/Vy/'` *  
C]/]ot0%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; vl1`s ^}R  
$=&a 0O#  
  5、 添加代码,编译运行程序。 oY)xXx  
APye  
三、程序代码 |7XPu  
02+ k,xFb  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL UYOveQ;  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)  rvP Y  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ .tRp  
#if _MSC_VER > 1000 ?w/i;pp<,  
#pragma once V\Q=EsHj   
#endif // _MSC_VER > 1000 CYkU-  
#ifndef __AFXWIN_H__ B8J_^kd  
#error include 'stdafx.h' before including this file for PCH 7T7 A\  
#endif l=+hs  
#include "resource.h" // main symbols aYy+iP'$  
class CHookApp : public CWinApp 7nsn8WN[  
{ 8rZJvE#c  
 public: y^OT0mZkg  
  CHookApp(); QlxzWd3=q  
  // Overrides )67pBj  
  // ClassWizard generated virtual function overrides P_7QZ0k/  
  //{{AFX_VIRTUAL(CHookApp) OO$YwOKS  
 public: 8s+9PE  
  virtual BOOL InitInstance(); lk/T| 0])  
  virtual int ExitInstance(); vMD%.tk  
  //}}AFX_VIRTUAL \ B \G=Y  
  //{{AFX_MSG(CHookApp) b({K6#?'[  
  // NOTE - the ClassWizard will add and remove member functions here. }.ZT?p\  
  // DO NOT EDIT what you see in these blocks of generated code ! goa@ e  
  //}}AFX_MSG w?;j5[j  
  DECLARE_MESSAGE_MAP() Hsdcv~Xr;l  
};  kD}w5 U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 1:Sq?=&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Dt#( fuk#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *P:!lO\|  
BOOL InitHotkey(); /w|!SZB  
BOOL UnInit(); 4fR}+[~2  
#endif 5)@UpcjUA  
=qWcw7!"  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. A-6><X's6  
#include "stdafx.h" ./7*<W:  
#include "hook.h" P0 4Q_A  
#include <windowsx.h> [{&GMc   
#ifdef _DEBUG Fy6(N{hql  
#define new DEBUG_NEW -e2f8PV?3  
#undef THIS_FILE L <QjkFj  
static char THIS_FILE[] = __FILE__; Yo-$Z-ud  
#endif PH1jN?OEwZ  
#define MAX_KEY 100 *(+*tj cWa  
#define CTRLBIT 0x04 >IT19(J;A  
#define ALTBIT 0x02 UR{OrNg*  
#define SHIFTBIT 0x01 s@$SM,tnn  
#pragma data_seg("shareddata") 6x*$/1'M3;  
HHOOK hHook =NULL; 59R%g .2Y  
UINT nHookCount =0; ;:WM^S  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey uge~*S  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT yhPO$L  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey xGkc_  
static int KeyCount =0; Kb$6a'u7  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift L>3-z>u,  
#pragma data_seg() #qnK nxD  
HINSTANCE hins; /l%+l@  
void VerifyWindow(); w/49O;rV  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) #{8t ?v l  
//{{AFX_MSG_MAP(CHookApp) +|K/*VVn`  
// NOTE - the ClassWizard will add and remove mapping macros here. [gkOwU=?  
// DO NOT EDIT what you see in these blocks of generated code! U,g)N[|  
//}}AFX_MSG_MAP |a|##/  
END_MESSAGE_MAP() .wpp)M.w;H  
.Ce0yAl~  
CHookApp::CHookApp() y$,j'B:;4m  
{ =".sCV9"N  
 // TODO: add construction code here, S%6V(L|  
 // Place all significant initialization in InitInstance )x<oRHx]  
} F?c : ).g  
1m{c8Z.h/d  
CHookApp theApp; dq4t@:\o0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 6uu49x_^L4  
{ ^1\[hyZ!  
 BOOL bProcessed=FALSE; hpBn_  
 if(HC_ACTION==nCode) -)pVgf  
 { G<m6Sf  
  if((lParam&0xc0000000)==0xc0000000){// Key up ~a ]R7X7  
   switch(wParam) (>,}C/-UG  
   { O<\h_   
    case VK_MENU: M>rertUR  
     MaskBits&=~ALTBIT; ).i :C(|  
     break; xXQW|#X\  
    case VK_CONTROL: gw^X-  
     MaskBits&=~CTRLBIT; E%&E<<nhZ  
     break; DQy;W  ov  
    case VK_SHIFT: &0Bs?oq_  
     MaskBits&=~SHIFTBIT; CubBD+h l*  
     break; ]vQU(@+I  
    default: //judge the key and send message JTS<n4<a  
     break; 5T-CAkR{n  
   } 6DxT(VU}  
   for(int index=0;index<MAX_KEY;index++){ cs-dvpMZ  
    if(hCallWnd[index]==NULL) [ApAd  
     continue; @wTRoMHPQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2tMa4L%@C  
    { ^@-qnU lH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Y- tK  
     bProcessed=TRUE; aUyJi  
    } #W2#'J:l  
   } =rzhaU'A'  
  } )uK Tf=;  
  else if((lParam&0xc000ffff)==1){ //Key down VD0U]~CWR  
   switch(wParam) ,9"A"p*R  
   { sOBuJx${m  
    case VK_MENU: JfVGs;_,  
     MaskBits|=ALTBIT; 0 >:RFCo  
     break; JPmZ%]wA  
    case VK_CONTROL: QG]*v=Z  
     MaskBits|=CTRLBIT; ,0^9VWZV  
     break; zz[[9Am!  
    case VK_SHIFT: <;q)V%IUz  
     MaskBits|=SHIFTBIT; gMB/ ~g5b0  
     break; 2O+fjs  
    default: //judge the key and send message Y}hz UKJ  
     break; hB1Gtc4n  
   } I`KBj6n  
   for(int index=0;index<MAX_KEY;index++) $[HpY)MSRw  
   { Q^ |aix~ K  
    if(hCallWnd[index]==NULL) G1S:hw%rp  
     continue; ;_D5]kl`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) pWN5>HV  
    { oh%/\Xu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); wg{Y6X yH  
     bProcessed=TRUE; Mb\[` 4z  
    } />[~2d kb  
   } BDc "0XH  
  } x5YHmvy/l  
  if(!bProcessed){ A,f%0 eQR  
   for(int index=0;index<MAX_KEY;index++){ n||!/u)*  
    if(hCallWnd[index]==NULL) <^YZ#3~1T  
     continue; 3@^b's'S|}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) !k0t (.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); L~} 2&w  
   } X0zE-h6P  
  } zmp Q=%/H  
 } mqv!"rk'w  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); F/chE c V  
} S$%Y{  
]zR,Y= #  
BOOL InitHotkey() nyr)d%I{  
{ 1`I#4f  
 if(hHook!=NULL){ +Heen3  
  nHookCount++; ^ ^R4%C  
  return TRUE; K0\Wty0  
 } o](nK5?  
 else d +Bz pS@p  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); d$*SVd:  
  if(hHook!=NULL) -nKBSls  
   nHookCount++; V[BlT|t  
  return (hHook!=NULL); dD}!E  
} #zv'N  
BOOL UnInit() WA79(B  
{ G)wIxm$?0  
 if(nHookCount>1){ _=oNQ  
  nHookCount--; gKay3}w  
  return TRUE; n:5*Tg9  
 } zV=(e( [  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 6P:H`  
 if(unhooked==TRUE){ ;3k6_ub  
  nHookCount=0; C%+>uzVIw  
  hHook=NULL; `A o;xOJ  
 } "yV)&4 )  
 return unhooked; $N`uM  
} X>6VucH{\  
9,;+B8-A  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `%M} :T  
{ ~*Ir\wE  
 BOOL bAdded=FALSE; NurbioFL  
 for(int index=0;index<MAX_KEY;index++){ j[o5fr)L  
  if(hCallWnd[index]==0){ >5!/&D.q  
   hCallWnd[index]=hWnd; J "dp?i  
   HotKey[index]=cKey; ;o0o6pF  
   HotKeyMask[index]=cMask; c&T14!lfn  
   bAdded=TRUE; )gAFz+  
   KeyCount++; Q`X5W  
   break; N~A#itmdx  
  } k<3 _!?3  
 } *>XY' -;2e  
 return bAdded; r ,,A%  
} G ]mX+?  
.cX,"2;n  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lZup n?  
{ hrr;=q$  
 BOOL bRemoved=FALSE; E~|`Q6&Y  
 for(int index=0;index<MAX_KEY;index++){ i|Y_X  
  if(hCallWnd[index]==hWnd){ "UY.; P  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4c_F>Jw[  
    hCallWnd[index]=NULL; 6@ HY+RCx  
    HotKey[index]=0; T6ZJSKM  
    HotKeyMask[index]=0; ,-XJ@@2gM  
    bRemoved=TRUE; t(:6S$6{e  
    KeyCount--; e[@ ^UY  
    break; CQcb !T  
   } 6c>tA2G|8  
  } !OJSQB,  
 } YMx zj  
 return bRemoved; ;Q.g[[J/p  
} *X^__PS]  
&sx|sLw)  
void VerifyWindow() {M?!nS6t  
{ zA/W+j$:  
 for(int i=0;i<MAX_KEY;i++){ pPG@_9qf  
  if(hCallWnd!=NULL){ m&Mvb[  
   if(!IsWindow(hCallWnd)){ =c8U:\0  
    hCallWnd=NULL; r_Rjjo  
    HotKey=0; uGQCW\!"4  
    HotKeyMask=0; OQA3~\Vu  
    KeyCount--; 6]}Xi:I  
   } g/q$;cB  
  } EN%Xs578  
 } 32IN;X|  
} 8&=+Mw  
5W!E.fz*T  
BOOL CHookApp::InitInstance() s geP`O%  
{ <>JDA(F"  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); >gr6H1  
 hins=AfxGetInstanceHandle(); GSW{h[Op  
 InitHotkey(); '}5}wCLA  
 return CWinApp::InitInstance(); ~^"cq S(  
} w I@ lO\  
V_(?mC  
int CHookApp::ExitInstance() Iq\sf-1E  
{ XY| -qd}A  
 VerifyWindow(); =k[!p'~jD  
 UnInit(); ):+H`Hcm  
 return CWinApp::ExitInstance(); 79%${ajSI  
} /d >fp  
Z3R..vy8  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?#kI9n<O  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) -c=IO(B/  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ rDYq]`  
#if _MSC_VER > 1000 o0wep&@  
#pragma once w'5~GhnP+  
#endif // _MSC_VER > 1000 xL>0&R  
i*Y/q-N|  
class CCaptureDlg : public CDialog 't{=n[  
{ 5Tp n`2F  
 // Construction |U^ ff^]  
 public: 2uWzcy ?F  
  BOOL bTray; ,[bcyf  
  BOOL bRegistered; 'EREut,>'  
  BOOL RegisterHotkey(); h3 p 3~xq  
  UCHAR cKey; kQIWDN  
  UCHAR cMask; fINM$ 6  
  void DeleteIcon(); cx2s|@u0  
  void AddIcon(); $Y,]D*|"K  
  UINT nCount; $vy.BY Fm  
  void SaveBmp(); #OWwg`AWv  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ~ilbW|s?=k  
  // Dialog Data B>Nxc@=D  
  //{{AFX_DATA(CCaptureDlg) `s:| 4;.  
  enum { IDD = IDD_CAPTURE_DIALOG }; .(S,dG0P  
  CComboBox m_Key; /p>"|z  
  BOOL m_bControl; 6XQ)Q)  
  BOOL m_bAlt; 66'TdF]"  
  BOOL m_bShift; h)wR[N]n  
  CString m_Path; ~:)$~g7>b  
  CString m_Number; :M3l#`4Q  
  //}}AFX_DATA o-O/MS   
  // ClassWizard generated virtual function overrides XtfL{Fy|T  
  //{{AFX_VIRTUAL(CCaptureDlg) u'K<-U8H  
 public: >/bl r}5 H  
  virtual BOOL PreTranslateMessage(MSG* pMsg); wKY6[vvF  
 protected: |x<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \0WMb  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); m; ABHq#  
  //}}AFX_VIRTUAL t41cl  
  // Implementation _i8$!b2Mr  
 protected: ,(`@ZFp$  
  HICON m_hIcon; jQ`"Op 3  
  // Generated message map functions %q*U[vv  
  //{{AFX_MSG(CCaptureDlg) nLtP^ 1~9H  
  virtual BOOL OnInitDialog(); cR5<.$aY  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); D}"GrY 5  
  afx_msg void OnPaint(); >; W)tc,  
  afx_msg HCURSOR OnQueryDragIcon(); Y,(eu*Za  
  virtual void OnCancel(); Tz*5;y%4  
  afx_msg void OnAbout(); FxZ\)Y   
  afx_msg void OnBrowse(); uEi!P2zN  
  afx_msg void OnChange();  Uero!+_  
 //}}AFX_MSG Ew;<iY[  
 DECLARE_MESSAGE_MAP() mG@Q}Y(  
}; @ ~sp:l  
#endif 5h> gz  
%?wuKZLnc  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file N{ 9<Tf*  
#include "stdafx.h" Y*}Sq|y  
#include "Capture.h" s{q2C}=$?D  
#include "CaptureDlg.h" mtOrb9` m  
#include <windowsx.h> nlY ^  
#pragma comment(lib,"hook.lib") THu a?,oyW  
#ifdef _DEBUG T]vD ,I+  
#define new DEBUG_NEW '[-/X a['  
#undef THIS_FILE ttw@nv% @  
static char THIS_FILE[] = __FILE__; _?r+SRFn  
#endif 2d>PN^x  
#define IDM_SHELL WM_USER+1 ?APzx@$D.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Qp=uiXs  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); cn\_;TYiJ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; %eah=e  
class CAboutDlg : public CDialog lT:<ZQyjT  
{ rzTyHK[  
 public: 3?geJlD4  
  CAboutDlg(); NFSPw` f  
  // Dialog Data AjlG_F  
  //{{AFX_DATA(CAboutDlg) V+Tj[:ok  
  enum { IDD = IDD_ABOUTBOX }; c"z%AzUV'  
  //}}AFX_DATA 9/%|#b-z  
  // ClassWizard generated virtual function overrides N4Lk3]  
  //{{AFX_VIRTUAL(CAboutDlg) iK#{#ebAoW  
 protected: T5Fah#-4  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support w}1)am &pD  
  //}}AFX_VIRTUAL eQLa.0  
  // Implementation =_1" d$S&  
 protected: ld?M,Qd  
  //{{AFX_MSG(CAboutDlg) JIQzP?+?  
  //}}AFX_MSG sS|zz,y  
  DECLARE_MESSAGE_MAP() 4Ek< 5s[  
}; YW}/C wB  
95<:-?4C;W  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) RTU:J67E  
{ S; c=6@"  
 //{{AFX_DATA_INIT(CAboutDlg) M)xK+f2_[  
 //}}AFX_DATA_INIT )b7mzDp(  
} dG rA18  
='JX_U`A^F  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) g<C})84y3  
{ z]WT>4  
 CDialog::DoDataExchange(pDX); + mcN6/  
 //{{AFX_DATA_MAP(CAboutDlg) M`<D Z<:<  
 //}}AFX_DATA_MAP OiOL 4}5(  
} %x *f{(8h  
_NkN3f5 1L  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Qd./G5CC  
 //{{AFX_MSG_MAP(CAboutDlg) hnZHu\EJ  
 // No message handlers |}}]&:w2  
 //}}AFX_MSG_MAP btY Pp0o~  
END_MESSAGE_MAP() +?<jSmGW  
g\.N>P@Bu  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) v\ox:C  
: CDialog(CCaptureDlg::IDD, pParent)  X"0Q)  
{ f/B--jq  
 //{{AFX_DATA_INIT(CCaptureDlg) 9j"\Lr*o "  
  m_bControl = FALSE; g3Q #B7A  
  m_bAlt = FALSE; yS43>UK_W+  
  m_bShift = FALSE; b?$09,{0  
  m_Path = _T("c:\\"); 8j$q%g  
  m_Number = _T("0 picture captured."); 6vA5L_  
  nCount=0; yR!>80$j  
  bRegistered=FALSE; R3PhKdQ"  
  bTray=FALSE; +{I\r|  
 //}}AFX_DATA_INIT 'KL(A-}!  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \\qg2yI  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ?*@h]4+k'  
} dF,FH-  
\f  LBw0  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) C;5}/J^E  
{ 1fy{@j(W  
 CDialog::DoDataExchange(pDX); =FbfV*K 9  
 //{{AFX_DATA_MAP(CCaptureDlg) E;4a(o]{t  
  DDX_Control(pDX, IDC_KEY, m_Key); RFC;1+Jn  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); fz&}N`n  
  DDX_Check(pDX, IDC_ALT, m_bAlt); .9xGLmg  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Ae#6=]V+^  
  DDX_Text(pDX, IDC_PATH, m_Path); MH?B .2  
  DDX_Text(pDX, IDC_NUMBER, m_Number); FCWphpz  
 //}}AFX_DATA_MAP (Gn[T1p?  
} 7q2YsI  
-AT@M1K7%  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) @\y7 9FX  
//{{AFX_MSG_MAP(CCaptureDlg) B`F82_O  
 ON_WM_SYSCOMMAND() D:(f"  
 ON_WM_PAINT() >DRs(~|V#  
 ON_WM_QUERYDRAGICON() vFOv IVp  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) XbC8t &Q],  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) &J b.OCf  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 7N"Bbl  
//}}AFX_MSG_MAP ["}A#cO652  
END_MESSAGE_MAP() IT(c'}  
M\&~Dmd  
BOOL CCaptureDlg::OnInitDialog() UjaC( c  
{  ~^S-  
 CDialog::OnInitDialog(); |DW'RopM  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ]SL&x:/-  
 ASSERT(IDM_ABOUTBOX < 0xF000); 76b7-Nj"  
 CMenu* pSysMenu = GetSystemMenu(FALSE); co3 ,8\N0  
 if (pSysMenu != NULL) )9r%% #  
 { 1Q5<6*QL"  
  CString strAboutMenu; dx}/#jMa  
  strAboutMenu.LoadString(IDS_ABOUTBOX); IJ8DN@w9  
  if (!strAboutMenu.IsEmpty()) :RsPGj6   
  { cPcV[6)5K9  
   pSysMenu->AppendMenu(MF_SEPARATOR); C=IH#E=  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ?C:fP`j:  
  } l5[xJH  
 } ".%LBs~$  
 SetIcon(m_hIcon, TRUE); // Set big icon ;ZJ,l)BNO  
 SetIcon(m_hIcon, FALSE); // Set small icon PHvjsA%"   
 m_Key.SetCurSel(0); /09=Tyy/\  
 RegisterHotkey(); / aG>we  
 CMenu* pMenu=GetSystemMenu(FALSE); `5Btg. &  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); hD1AK+y  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Wts{tb  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); `4 bd,  
 return TRUE; // return TRUE unless you set the focus to a control (J&Xo.<Z-  
} mM* yv  
lrhAO"/1  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) k+[KD>;1  
{ +ca296^  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) -ZP&zOsDr  
 { gKN_~{{OD  
  CAboutDlg dlgAbout; b3xkJ&Z  
  dlgAbout.DoModal(); j/D)UWkR  
 } 8>Z$/1Mh  
 else P(epG?Qg  
 { b@/ON}gX  
  CDialog::OnSysCommand(nID, lParam); S=,1} XZ  
 } J'yN' 0  
} 'w[d^L   
$`{q[{  
void CCaptureDlg::OnPaint() {@5WeWlz~  
{ cWO )QIE  
 if (IsIconic()) TRLeZ0EC  
 { i\;&CzC:  
  CPaintDC dc(this); // device context for painting `E=rh3 L0o  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); cqY.^f.  
  // Center icon in client rectangle \>Rwg=Lh  
  int cxIcon = GetSystemMetrics(SM_CXICON); .)> /!|i  
  int cyIcon = GetSystemMetrics(SM_CYICON); N&APqT  
  CRect rect; MQ(/l_=zQ  
  GetClientRect(&rect); LGROEn<*d  
  int x = (rect.Width() - cxIcon + 1) / 2; P0ltN  
  int y = (rect.Height() - cyIcon + 1) / 2; )O@^H   
  // Draw the icon 5 ?~-Vv31s  
  dc.DrawIcon(x, y, m_hIcon); "42$AaS  
 } o U}t'WU  
 else 1qj%a%R  
 { >zg8xA1zL  
  CDialog::OnPaint(); &]6K]sWJK{  
 } Kn#xY3W6  
} J(0=~Z[  
a^c ,=X3  
HCURSOR CCaptureDlg::OnQueryDragIcon() N~5WA3xd  
{ :F>L;mp  
 return (HCURSOR) m_hIcon; s.;KVy,=Bu  
} G^rh*cb K  
qH%L"J  
void CCaptureDlg::OnCancel() 5u)^FIBj  
{ {0vbC/?]  
 if(bTray) V\K m% vP  
  DeleteIcon(); ;D"P9b]9$  
  CDialog::OnCancel(); s$>m0^  
} :+ 9Ft>  
R%N#G<^R  
void CCaptureDlg::OnAbout() V> a3V'  
{ {<}I9D5  
 CAboutDlg dlg; CDW(qq-zD  
 dlg.DoModal(); _`@Xy!Ye  
} #~URLN  
ro&Y7m  
void CCaptureDlg::OnBrowse() M-Z6TL  
{ K~Au?\{  
 CString str; r,.95@  
 BROWSEINFO bi; J;=aIiN]R  
 char name[MAX_PATH]; av; (b3Lq  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); M,\|V3s  
 bi.hwndOwner=GetSafeHwnd(); )/WA)fWkT  
 bi.pszDisplayName=name; Ec*--]j*c  
 bi.lpszTitle="Select folder"; $qlqW y-s  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; p=-B~:  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); F*4Qa  
 if(idl==NULL) bpF@}#fT  
  return; |T$a+lHMD  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); eW"x%|/Q7  
 str.ReleaseBuffer(); D;^ZWz0  
 m_Path=str; )| Vg/S  
 if(str.GetAt(str.GetLength()-1)!='\\') b*FU*)<4.  
  m_Path+="\\"; SEQO2`]e:  
 UpdateData(FALSE); bm tJU3Rm  
} ?mYV\kDt\  
j |'# 5H`  
void CCaptureDlg::SaveBmp() U)`3[fo  
{ cB|Cy{%  
 CDC dc; hDB`t $  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 7:VEM;[d  
 CBitmap bm; Xw*%3'  
 int Width=GetSystemMetrics(SM_CXSCREEN); ilIV}8  
 int Height=GetSystemMetrics(SM_CYSCREEN); !QQ<Ai!E  
 bm.CreateCompatibleBitmap(&dc,Width,Height); k\Z;Cmh>  
 CDC tdc; neB.Wu~WH  
 tdc.CreateCompatibleDC(&dc); ^C:{z)"h  
 CBitmap*pOld=tdc.SelectObject(&bm); 5gc:Y`7t  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ]O[+c*|w  
 tdc.SelectObject(pOld); Q_dXRBv=n  
 BITMAP btm; "lU]tIpCu  
 bm.GetBitmap(&btm); c;b[u:>~-  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; hHfe6P |  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); iC\rhHKQ  
 BITMAPINFOHEADER bih; kKxL04  
 bih.biBitCount=btm.bmBitsPixel; t7*G91Hoq&  
 bih.biClrImportant=0; mq{$9@3  
 bih.biClrUsed=0; )WP]{ W)r  
 bih.biCompression=0; >uyeI&z  
 bih.biHeight=btm.bmHeight; <nOuyGIZ  
 bih.biPlanes=1; r?"}@MRW  
 bih.biSize=sizeof(BITMAPINFOHEADER); p-T~x$"c|  
 bih.biSizeImage=size; m0BG9~p|  
 bih.biWidth=btm.bmWidth; %/tGkS6  
 bih.biXPelsPerMeter=0; U5On-T5  
 bih.biYPelsPerMeter=0; x;ERRK  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ^B<PD]  
 static int filecount=0; 5S|}:~7T  
 CString name; q*F~~J!P  
 name.Format("pict%04d.bmp",filecount++); ]} 5I>l  
 name=m_Path+name; + +T "+p  
 BITMAPFILEHEADER bfh; q#Yg0w~  
 bfh.bfReserved1=bfh.bfReserved2=0; >%n8W>^^4  
 bfh.bfType=((WORD)('M'<< 8)|'B'); -~( 0O  
 bfh.bfSize=54+size; qXP1Q3  
 bfh.bfOffBits=54; 7E!";HT  
 CFile bf; [Q7->Wo|S:  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ k lP{yxU'n  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); @o4z3Q@  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); |iwM9oO%  
  bf.WriteHuge(lpData,size); %S >xSqX  
  bf.Close(); _ bXVg3oDt  
  nCount++; ,yHzo  
 } pjX%LsX\  
 GlobalFreePtr(lpData); u n?j  
 if(nCount==1) 1kvPiV=X>  
  m_Number.Format("%d picture captured.",nCount); DJ1XN pm  
 else b[{m>Fa+o#  
  m_Number.Format("%d pictures captured.",nCount); 4hsPbUx9  
  UpdateData(FALSE); /@9-!cL  
} .^[fG59  
Jo7fxWO_g  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) DU/9/ I?~  
{ ]b0zkoD9<  
 if(pMsg -> message == WM_KEYDOWN) nu469  
 { t5ny"k!  
  if(pMsg -> wParam == VK_ESCAPE) lQp89*b?=U  
   return TRUE; AND7jEn  
  if(pMsg -> wParam == VK_RETURN) R\9>2*w  
   return TRUE; (!3Yc:~RE  
 } {~j /XB  
 return CDialog::PreTranslateMessage(pMsg); aWHd}%  
} 2p$n*|T&c  
p~Yy"Ec;p  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) EFa{O`_@U  
{ i$`|Y*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ P;)2*:--)  
  SaveBmp(); >~`Y   
  return FALSE; _SMT.lG  
} }"%!(rx  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ LKK{j,g7  
 CMenu pop; <_BqpZ^`  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); SE-!|WR  
 CMenu*pMenu=pop.GetSubMenu(0); ^w;o\G  
 pMenu->SetDefaultItem(ID_EXITICON); _qC+'RE3  
 CPoint pt; [<en1  
 GetCursorPos(&pt); "J]f0m=  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 4 o3)*  
 if(id==ID_EXITICON) 6T^N!3p_  
  DeleteIcon(); O_r^oH  
 else if(id==ID_EXIT) m+D2hK*  
  OnCancel(); .;<7424(%  
 return FALSE; 1zb$5{,|  
} !XgQJ7y_Z  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); FSW3'  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) NDB*BmG  
 AddIcon(); S KB@  
 return res; 8eOl@}bV  
} 'sm[CNzS  
g2[K<  
void CCaptureDlg::AddIcon() L0X&03e=e:  
{ ]uBT &  
 NOTIFYICONDATA data; !pd7@FwC  
 data.cbSize=sizeof(NOTIFYICONDATA); x><zGXvvp|  
 CString tip; bajC-5R1k  
 tip.LoadString(IDS_ICONTIP); _N>wzkJ  
 data.hIcon=GetIcon(0); kN'|,eKH4  
 data.hWnd=GetSafeHwnd(); w;N{>)hv  
 strcpy(data.szTip,tip); w"fCI 13  
 data.uCallbackMessage=IDM_SHELL; +}Kk2Kg8  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; E0sbU<11  
 data.uID=98; "_ nX5J9  
 Shell_NotifyIcon(NIM_ADD,&data); +G5'kYzJ  
 ShowWindow(SW_HIDE); 4ggVj*{v  
 bTray=TRUE; ]h #WkcXQ  
} GIl:3iB49  
Nb gp_:{  
void CCaptureDlg::DeleteIcon() |x1$b 7  
{ QDIsC  
 NOTIFYICONDATA data; xT{TVHdU  
 data.cbSize=sizeof(NOTIFYICONDATA); y,'FTP9?  
 data.hWnd=GetSafeHwnd(); <h'8w  
 data.uID=98; #Y;.>mF  
 Shell_NotifyIcon(NIM_DELETE,&data); %3]3r*e&5  
 ShowWindow(SW_SHOW); Sp<hai  
 SetForegroundWindow(); umJay />  
 ShowWindow(SW_SHOWNORMAL); M.o?CX'  
 bTray=FALSE; ,$HHaoo g  
} ,3G$`  
UqD5 A~w  
void CCaptureDlg::OnChange() >=4sPF)  
{ am]3 "V>  
 RegisterHotkey(); Hm.X}HO0L  
} R!sNg   
n (OjjR m  
BOOL CCaptureDlg::RegisterHotkey() y.jS{r".  
{ QH& %mr.S  
 UpdateData(); qsI{ b<n  
 UCHAR mask=0; |!$ Q<-]f  
 UCHAR key=0; Sv.KI{;v$  
 if(m_bControl) \z2vV +f  
  mask|=4; y' 2<qj  
 if(m_bAlt) cge-'/8w%  
  mask|=2; $`^H:Djr  
 if(m_bShift) DY$yiOH9  
  mask|=1; PqTYAN&F  
  key=Key_Table[m_Key.GetCurSel()]; b OW}"  
 if(bRegistered){ uEBQoP2  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); YavfjS:2  
  bRegistered=FALSE; ri_P;#lz  
 } 8&i;hZm  
 cMask=mask; gs$3)t  
 cKey=key; G=vN;e_$_b  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); g<M0|eX@~  
 return bRegistered; eT;AAGql  
} 1UC2zM"  
6(:)otz  
  四、小结 *hV4[=  
1oB$MQoc  
  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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