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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: @-Ln* 3n  
  JURJN+)z  
  一、实现方法 JsbH'l  
(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: % !p/r`  
z)&GF$*  
#pragma data_seg("shareddata") R4[dh.lf  
HHOOK hHook =NULL; //钩子句柄 #{suH7  
UINT nHookCount =0; //挂接的程序数目 H"%SzU  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ~6Df~uN  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 =.f<"P51k  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey @BS7Gyw  
static int KeyCount =0; 6 +x>g  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 .DZ8kKY  
#pragma data_seg() y2NVx!?n  
7g&<ZZo  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 0} Lx}2  
>d#Ks0\&  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: S}XVr?l 2O  
%XK<[BF  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR XyytO;X M-  
cKey,UCHAR cMask) G~`nLC^Y  
{ 1JO@G3,  
 BOOL bAdded=FALSE; n%}Vd `c  
 for(int index=0;index<MAX_KEY;index++){ A_<1}8{L  
  if(hCallWnd[index]==0){ b5d;_-~d  
   hCallWnd[index]=hWnd; _U/CG<n  
   HotKey[index]=cKey; ICXz(?a  
   HotKeyMask[index]=cMask; /d]{ #,k  
   bAdded=TRUE; Ikj_ 0/%F  
   KeyCount++; Vh;P,no#  
   break; o9L$B  
  } l?swW+ x\  
 } TrC :CL  
 return bAdded; PR*qyELu  
} d@,3P)?  
//删除热键 LwS>jNJx  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) M>"J5yqR  
{ 8nOent0a  
 BOOL bRemoved=FALSE; {\zB'SNq  
 for(int index=0;index<MAX_KEY;index++){ Jb"0P`senY  
  if(hCallWnd[index]==hWnd){ M8iI e:{ c  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Aq"<#:  
    hCallWnd[index]=NULL; 30nR2mB Kt  
    HotKey[index]=0; wf=M| #}_  
    HotKeyMask[index]=0; 3rQ;}<*M  
    bRemoved=TRUE; g7nqe~`{  
    KeyCount--; 6qzyeli  
    break; ql c{k/ u  
   } =pR'XF%  
  } k&8&D  
 } ]0&ExD\4  
 return bRemoved; !xo; $4  
} mYiIwm1cb(  
W! q-WU  
9q|36CAO_  
  DLL中的钩子函数如下: ums*EKjs97  
d ,!sZ&v  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) [_,Gk]F=  
{ z'd*z[L~  
 BOOL bProcessed=FALSE; NamO5(1C  
 if(HC_ACTION==nCode) dqo&3^px  
 { A%dI8Z,  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Th[Gu8b3  
   switch(wParam) ;H:+w\?8f$  
   {  "I`g(q#Uo  
    case VK_MENU: wUBug  
     MaskBits&=~ALTBIT; HtbN7V/  
     break; _|%l) KO  
    case VK_CONTROL: " .:b43Z  
     MaskBits&=~CTRLBIT; %V3xO%  
     break; *{e?%!Q  
    case VK_SHIFT: Zo(p6rku  
     MaskBits&=~SHIFTBIT; Q( \2(x\  
     break; /~B \1  
    default: //judge the key and send message = 7TK&  
     break; Fi!XaO  
   } ss>p  
   for(int index=0;index<MAX_KEY;index++){ |g}~7*+i  
    if(hCallWnd[index]==NULL) #X?#v7i",D  
     continue; n.\|NR'v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?g\SF}2  
    { 7o5~J)qIC  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); JK@" &  
     bProcessed=TRUE; <.qhW^>X  
    } R" '=^  
   } _pS!sY~d  
  } 7y2-8e L  
  else if((lParam&0xc000ffff)==1){ //有键按下 (<:mCPk(~  
   switch(wParam) k%S;N{Qh@  
   { K4>nBvZ?v  
    case VK_MENU: mfpL?N  
     MaskBits|=ALTBIT; _wMYA8n  
     break; pJpTOq\h  
    case VK_CONTROL: yC<[LH  
     MaskBits|=CTRLBIT;  %SSBXWP  
     break; ubvXpK:.  
    case VK_SHIFT: C-6m[W8S  
     MaskBits|=SHIFTBIT; 4RXF.kJ3=  
     break; 'E#;`}&Ah  
    default: //judge the key and send message wX!>&Gc.  
     break; V0!.>sX9  
   } A(<"oAe|  
   for(int index=0;index<MAX_KEY;index++){ o}4J|@Hi|4  
    if(hCallWnd[index]==NULL) UAi]hUq  
     continue; 540,A,>:tb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) | N/Wu9w$  
    { v%6mH6V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); g9$P J:  
     bProcessed=TRUE; +S3r]D3v/  
    } ?6[X=GeUs  
   } c3NUJ~>=y  
  } p0S;$dH\ D  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 C@8WY  
   for(int index=0;index<MAX_KEY;index++){ qIIl,!&}A  
    if(hCallWnd[index]==NULL) +@c-:\K%  
     continue; DoYzTSWx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) yA#-}Y|]b  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); > l@ o\  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 wK[Xm'QTPJ  
   } xf?6_=  
  } t:h~p-&QB  
 } B1C"F-2d  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $sX X6K),  
} 82bOiN15  
~ [4oA$[a|  
  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: %G%D[ i]  
"uthFE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); z]J pvw`p  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #*|0WaC  
KW~fW r8  
  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: vKvT7Zxc  
/EpsJb`kj  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4}\Dr %US  
{ (.DX</f/4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) H!+T2<F9R  
 { w[V71Iej  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 b&$sY!iU  
  SaveBmp(); GG@&jcp7  
  return FALSE; *7yu&a8  
 } JZS#Q\JN  
 …… //其它处理及默认处理 %`~? w'  
} ;| :^zo  
ayb fBC  
Dm.tYG  
  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。 =H\ig%%E@  
=!RlU)w  
  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。 Apfs&{Uy  
=h{j F7  
  二、编程步骤 X!w&ib-  
wv eej@zs  
  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"; 32N *E,  
J:q:g*Wi  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; mP?~#RZ  
uk(|c-_]~c  
  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; B[I a8t  
e{dYLQd  
  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; )|`# BC  
d&'}~C`~k  
  5、 添加代码,编译运行程序。 #<\A[Po  
dt efDsK  
三、程序代码 O\(0{qu  
@%5$x]^  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL NzP5s&,C69  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9mT;> mE  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ =[ $zR>o*%  
#if _MSC_VER > 1000 *:*Kdt`'G  
#pragma once o y'GAc/  
#endif // _MSC_VER > 1000 )^C w  
#ifndef __AFXWIN_H__ laQM*FLg  
#error include 'stdafx.h' before including this file for PCH X8Xw'  
#endif 5V^+;eO  
#include "resource.h" // main symbols \Q5Jg  
class CHookApp : public CWinApp =nmvG%.hd  
{ Z3)l5JG)  
 public: ezC2E/#  
  CHookApp(); : Nf-}"  
  // Overrides ?1f(@  
  // ClassWizard generated virtual function overrides NG2@.hP:uU  
  //{{AFX_VIRTUAL(CHookApp) j;|rI`67~  
 public: f~LM-7!zf}  
  virtual BOOL InitInstance(); 1P'R-I  
  virtual int ExitInstance(); OC[+t6  
  //}}AFX_VIRTUAL ~S],)E1w  
  //{{AFX_MSG(CHookApp) +])St3h  
  // NOTE - the ClassWizard will add and remove member functions here. SRixT+E  
  // DO NOT EDIT what you see in these blocks of generated code ! #hOAG_a,  
  //}}AFX_MSG sKkk+-J4  
  DECLARE_MESSAGE_MAP() &4%j   
}; )i;o\UU  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); #Zm%U_$<  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \*5_gPj!d  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); T =l4Vb{>  
BOOL InitHotkey(); j>5D4}*]f  
BOOL UnInit(); %Tn0r|K  
#endif ,pgpu !  
nI-^   
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ;JK !dzi}  
#include "stdafx.h" ,DHiM-v  
#include "hook.h" !1:364  
#include <windowsx.h> ~vVsxC$.  
#ifdef _DEBUG Wa8?o~0"L  
#define new DEBUG_NEW @"6dq;"  
#undef THIS_FILE hY?x14m$3  
static char THIS_FILE[] = __FILE__; o+H;ZGT5H  
#endif  {ws:g![  
#define MAX_KEY 100 "v"w ER?  
#define CTRLBIT 0x04 483BrFV  
#define ALTBIT 0x02 \9*,[mvC  
#define SHIFTBIT 0x01 qw!_/Z3[  
#pragma data_seg("shareddata") j&G*$/lTO6  
HHOOK hHook =NULL; >l\?K8jL9  
UINT nHookCount =0; J&xH "U  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey B/(]AWi+  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT M``I5r*cg  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey )1>fQ9   
static int KeyCount =0; | 'SqG}h  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift fR=B/`  
#pragma data_seg() }NQ {S3JW  
HINSTANCE hins; i#@3\&{J>  
void VerifyWindow(); |kHPk)}I]  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Hw1<! Dyv  
//{{AFX_MSG_MAP(CHookApp) Vp;^_,  
// NOTE - the ClassWizard will add and remove mapping macros here. 50:$km\  
// DO NOT EDIT what you see in these blocks of generated code! ^cE|o&Rm;  
//}}AFX_MSG_MAP 2Mc}>UI?eO  
END_MESSAGE_MAP() 5z8!Nmb/  
=%4vrY `  
CHookApp::CHookApp() "g)@jqq:>  
{ xwwy9:ze*l  
 // TODO: add construction code here, +v 9@du  
 // Place all significant initialization in InitInstance yW&|ZJF?  
} nyZUf{:  
26Y Y1T\B)  
CHookApp theApp; %|l^oC+E  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) / M(A kNy  
{ 2d,q?VH$  
 BOOL bProcessed=FALSE; AwhXCq|k  
 if(HC_ACTION==nCode) D Hkmn  
 { hhTM-D1Ehs  
  if((lParam&0xc0000000)==0xc0000000){// Key up ZiBTe,;  
   switch(wParam) ~aK@M4  
   { n\Z& sc  
    case VK_MENU: cxhS*"Ph  
     MaskBits&=~ALTBIT; TSQ/{=r  
     break; D\~*| J  
    case VK_CONTROL: 87P.K Yy  
     MaskBits&=~CTRLBIT; c=U1/=R5  
     break; IK%fX/tDyc  
    case VK_SHIFT: k_rtsN  
     MaskBits&=~SHIFTBIT; q M( n]{H  
     break; Rc2|o.'y  
    default: //judge the key and send message \:cr2w'c  
     break; #tyHjk  
   } P +U=/$o  
   for(int index=0;index<MAX_KEY;index++){ =='~g~  
    if(hCallWnd[index]==NULL) l65-8  
     continue; O`nrXC{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2k,!P6fgl  
    { 6{rH|Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #!wL0 p  
     bProcessed=TRUE; A^PCI*SN[  
    } aB9Pdu t  
   } ZyBNo]  
  } S ^?&a5{o  
  else if((lParam&0xc000ffff)==1){ //Key down nu {bEp  
   switch(wParam) KmoPFlw  
   { v3w5+F  
    case VK_MENU: ^c1%$@H  
     MaskBits|=ALTBIT; ='1J&w~7  
     break; mmrx*sr=  
    case VK_CONTROL: "]}+QK_  
     MaskBits|=CTRLBIT; gn&jNuGg  
     break; B;A^5~b  
    case VK_SHIFT: 5gP#V K  
     MaskBits|=SHIFTBIT; eW$G1h:  
     break; r2A(GUz  
    default: //judge the key and send message [gZd$9a  
     break; =F2e*?a3  
   } $QQv$  
   for(int index=0;index<MAX_KEY;index++) vpOn0([hS  
   { A~ugx~S0  
    if(hCallWnd[index]==NULL) 7dl]f#uZU  
     continue; "x&hBJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k$nQY  
    { Ic 4>kKh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); {6YLiQ*_  
     bProcessed=TRUE; K8y/U(@|D  
    } 7bioLE  
   } MR$Bl"d  
  } KQ<pQkhv  
  if(!bProcessed){ 9.R)iA  
   for(int index=0;index<MAX_KEY;index++){ O/M\Q  
    if(hCallWnd[index]==NULL) nA%H`/O{  
     continue; lgTavs  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $a(EF 6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -R 4 t  
   } -[?q?w!?  
  } pX ]K-  
 } :&Xy#.un  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); PdG:aGQ>  
} |,F/_    
2ul!f7#E  
BOOL InitHotkey() 6dO )]  
{ TCJH^gDt  
 if(hHook!=NULL){ !h&A^sAc  
  nHookCount++; jj8AV lN  
  return TRUE; /X)fWO S6  
 } w^09|k  
 else `i0RLGze  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ;Dg8>  
  if(hHook!=NULL) T'2(sHk  
   nHookCount++; b`E'MX_ m  
  return (hHook!=NULL); xfw)0S  
} \3w=')({  
BOOL UnInit() O G#By6O  
{ d V#h~  
 if(nHookCount>1){ eS9/- Y  
  nHookCount--; jvn:W{'Q  
  return TRUE; weC$\st:D  
 } dL5u-<y&  
 BOOL unhooked = UnhookWindowsHookEx(hHook); i[)H!%RV*  
 if(unhooked==TRUE){ OpmI" 4{+  
  nHookCount=0; +~RiCZt  
  hHook=NULL; )y-y-B=+T  
 } *,!6#Z7  
 return unhooked; =if5$jE3  
} 'Uqz,  
TGu`r>N51  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) '~A~gK0  
{ h_L-M}{OG  
 BOOL bAdded=FALSE; 0}jB/Z_T  
 for(int index=0;index<MAX_KEY;index++){ e"P>b? OY  
  if(hCallWnd[index]==0){ 9r% O  
   hCallWnd[index]=hWnd; W>0 36  
   HotKey[index]=cKey; -sl] funRy  
   HotKeyMask[index]=cMask; %c)^8k;I  
   bAdded=TRUE; # (B <n  
   KeyCount++; %gDMz7$~  
   break; MHJH@$|]  
  } &^^zm9{  
 } z 7OTL<h  
 return bAdded; I:[^><?E  
} TG'_1m*$  
gy/z;fB  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jV`xRjh  
{ sEq_K#n{  
 BOOL bRemoved=FALSE; lpLjfHr  
 for(int index=0;index<MAX_KEY;index++){ DE:FWD<}  
  if(hCallWnd[index]==hWnd){ 0|n1O)>J  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){  U=MFNp+  
    hCallWnd[index]=NULL; 5O<7<O B  
    HotKey[index]=0; GZQy~Uk~  
    HotKeyMask[index]=0; /<)A!Nn+F  
    bRemoved=TRUE; Fu:VRul=5$  
    KeyCount--; s,O:l0  
    break; u{maE ,  
   } e*.l6H/B  
  } $+qJ#0OE$  
 } <eK F  
 return bRemoved; XqMJe'%r  
} 3 4CqLPg8  
4JSf t t  
void VerifyWindow() ~#+ Hhc(  
{ -R@mnG 5  
 for(int i=0;i<MAX_KEY;i++){ 0@ []l{N  
  if(hCallWnd!=NULL){ 'Y{fah  
   if(!IsWindow(hCallWnd)){ <z+5+h|^  
    hCallWnd=NULL; ^w'y>uFM  
    HotKey=0; W3K?K-  
    HotKeyMask=0; =n|n%N4Y  
    KeyCount--; 5SKj% %B2,  
   } Ge=+ 0W)&  
  } CL oc  
 } 9q;n@q:29  
} o_hk!s^4m  
t=\y|Idc  
BOOL CHookApp::InitInstance() WVlyR\.  
{ 'N#,,d/G  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); X@JrfvKv[d  
 hins=AfxGetInstanceHandle(); 'B0= "7  
 InitHotkey(); +HvEiY  
 return CWinApp::InitInstance(); -:]_DbF  
} jy#'oadS?  
nS'hdeoW  
int CHookApp::ExitInstance() }_m/3*x_  
{ 0w[#`  
 VerifyWindow(); 70IBE[T&  
 UnInit(); *CG-F=  
 return CWinApp::ExitInstance(); D0NSzCHx  
} _GSl}\  
MBZ/Pzl~  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file AdV&w: ^yf  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _s{on/u  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ *m$P17/C  
#if _MSC_VER > 1000 CYD&#+o  
#pragma once \=3V]7\&  
#endif // _MSC_VER > 1000 oqeA15k$  
YmXh_bk  
class CCaptureDlg : public CDialog 3gN#[P  
{ c!n\?lB  
 // Construction b7&5>Q/ g  
 public: @AM;58.  
  BOOL bTray; _?Q0yVH;,  
  BOOL bRegistered; BVAxeXO  
  BOOL RegisterHotkey(); S[g{ )p)  
  UCHAR cKey; Kxs_R#k  
  UCHAR cMask; \/E+nn\)  
  void DeleteIcon(); }',/~T6  
  void AddIcon(); );-?~   
  UINT nCount; $mf Z{  
  void SaveBmp(); ;jC}.] _)w  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor T \d-r#{  
  // Dialog Data ^lADq']  
  //{{AFX_DATA(CCaptureDlg) aPD4S&"Q  
  enum { IDD = IDD_CAPTURE_DIALOG }; `<}Q4p  
  CComboBox m_Key; 5cY([4,  
  BOOL m_bControl; _J' _9M?>  
  BOOL m_bAlt; AXbDCDA  
  BOOL m_bShift; F\LAw#IJ  
  CString m_Path; "N'|N.,  
  CString m_Number; 4KH8dau.fF  
  //}}AFX_DATA 7Aj o9  
  // ClassWizard generated virtual function overrides N$cm;G=]  
  //{{AFX_VIRTUAL(CCaptureDlg) {,V.IDs8[  
 public: T["(wPrt  
  virtual BOOL PreTranslateMessage(MSG* pMsg); s#phs `v  
 protected: T >BlnA  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [diUO1p  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); &~9'7 n!  
  //}}AFX_VIRTUAL J/OG\}  
  // Implementation >ucVrLm,X  
 protected: R<* c   
  HICON m_hIcon; 7sgK+ ip  
  // Generated message map functions +MHsdeGU1W  
  //{{AFX_MSG(CCaptureDlg) Nu}x`Qkmr  
  virtual BOOL OnInitDialog(); +OEheG8  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); |AgdD  
  afx_msg void OnPaint(); $@WqM$  
  afx_msg HCURSOR OnQueryDragIcon(); :.2Tcq  
  virtual void OnCancel(); Gcu[G]D  
  afx_msg void OnAbout(); )1E[CIaXK  
  afx_msg void OnBrowse(); QkY]z~P4  
  afx_msg void OnChange(); ,drbj.0-  
 //}}AFX_MSG ^a,Oi%  
 DECLARE_MESSAGE_MAP() nw.,`M,N  
}; WD`z\{hcom  
#endif vIMLUL0  
`Mg&s*  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file k4@$vxy0  
#include "stdafx.h" YTb/ LeuT  
#include "Capture.h" ,}8|[)"  
#include "CaptureDlg.h" |"gg2p  
#include <windowsx.h> S9cAw5E(yN  
#pragma comment(lib,"hook.lib") =x_~7 Xc{  
#ifdef _DEBUG IF>dsAAI<  
#define new DEBUG_NEW QYS 1.k  
#undef THIS_FILE q:iB}ch5R  
static char THIS_FILE[] = __FILE__; !PAuMj)P  
#endif `]u!4pP"  
#define IDM_SHELL WM_USER+1 ( vO\h8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4y: pj7h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2cnyq$4k  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; zYCS K~-GW  
class CAboutDlg : public CDialog S)n+E\c  
{ 6jDHA3  
 public: xAZ-_}'tW  
  CAboutDlg(); 3zr95$Mt  
  // Dialog Data sWG_MEbu  
  //{{AFX_DATA(CAboutDlg) ~4T:v _Q7g  
  enum { IDD = IDD_ABOUTBOX }; d_ [l{  
  //}}AFX_DATA AlVB hR`  
  // ClassWizard generated virtual function overrides L\GjG&Y5  
  //{{AFX_VIRTUAL(CAboutDlg) cN?}s0  
 protected: $;k2b4u  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <SPT2NyX  
  //}}AFX_VIRTUAL 9/yE\p .  
  // Implementation $vC}Fq  
 protected: eH0^d5bH  
  //{{AFX_MSG(CAboutDlg) N(7UlS,u'  
  //}}AFX_MSG BQOit.  
  DECLARE_MESSAGE_MAP() P{2ue`w[  
}; 1:.I0x!  
$'I-z.GV  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Dr_ (u<[  
{ zJMm=Mw^  
 //{{AFX_DATA_INIT(CAboutDlg) >QA;02  
 //}}AFX_DATA_INIT ^!FLi7X  
} .XZq6iF9  
l`mNOQ@}'  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 8Ry%HV9VE  
{ EE,57(  
 CDialog::DoDataExchange(pDX); $~h\`vF&  
 //{{AFX_DATA_MAP(CAboutDlg) Vw@?t(l>  
 //}}AFX_DATA_MAP rBLcj;,  
} 4.t72*ML  
R=co2 5  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) LBw$K0  
 //{{AFX_MSG_MAP(CAboutDlg) \LEU reTn  
 // No message handlers g> <*qd?t  
 //}}AFX_MSG_MAP izvwXC  
END_MESSAGE_MAP() ';vL j1v  
_U<r@  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) E3~Wyfd7  
: CDialog(CCaptureDlg::IDD, pParent) )8_ x  
{ Q)s`~G({P  
 //{{AFX_DATA_INIT(CCaptureDlg) BYKONZu  
  m_bControl = FALSE; XwlF[3VbiX  
  m_bAlt = FALSE; qX%oLa  
  m_bShift = FALSE; Y0 ?<~Gf  
  m_Path = _T("c:\\"); U;q GUqI  
  m_Number = _T("0 picture captured."); v>!tws5e  
  nCount=0; {gkY:$xnrG  
  bRegistered=FALSE; 9sId2py]W  
  bTray=FALSE; DKG99biJN  
 //}}AFX_DATA_INIT b" PRa|]  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 7`pK=E}+  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); D=^|6}  
} i^Ip+J+[  
kp=wz0#  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?]]7PEee*  
{ 0;/},B[A  
 CDialog::DoDataExchange(pDX); -|WQs'%O  
 //{{AFX_DATA_MAP(CCaptureDlg) sWGc1jC?.F  
  DDX_Control(pDX, IDC_KEY, m_Key); fgW>~m.W  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); g~v>{F+u  
  DDX_Check(pDX, IDC_ALT, m_bAlt); -"} mmTa*<  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); sVNM#,  
  DDX_Text(pDX, IDC_PATH, m_Path); Fu$JI8  
  DDX_Text(pDX, IDC_NUMBER, m_Number); c*N>7IF,  
 //}}AFX_DATA_MAP Xf/qUao  
} _q1b3)`D  
L Rn)  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Q^@z]Sc[  
//{{AFX_MSG_MAP(CCaptureDlg) %-Oo9 2tP  
 ON_WM_SYSCOMMAND() $8;`6o`  
 ON_WM_PAINT() N_Q\+x}zq  
 ON_WM_QUERYDRAGICON() nN*:"F/^  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) _!:*&{  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) *,y .%`o  
 ON_BN_CLICKED(ID_CHANGE, OnChange) F&6Xo]?  
//}}AFX_MSG_MAP =P)H3|AdIm  
END_MESSAGE_MAP() [R%Pf/[Fr  
(d ?sFwOt\  
BOOL CCaptureDlg::OnInitDialog() %kXg|9Bx!  
{ uk<JV*R=  
 CDialog::OnInitDialog(); v$]eCj'  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); a`E1rK'  
 ASSERT(IDM_ABOUTBOX < 0xF000); <"HbX  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 0~GtK8^B  
 if (pSysMenu != NULL) 4cQ|"sOzD  
 { aS)Gj?Odf  
  CString strAboutMenu; h$U(1B  
  strAboutMenu.LoadString(IDS_ABOUTBOX); !W48sZr1&  
  if (!strAboutMenu.IsEmpty()) sF!nSr  
  { [7sy}UH  
   pSysMenu->AppendMenu(MF_SEPARATOR); t{g7 :A  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);  WgayH  
  } 1 2y+g5b  
 } kW.it5Z#  
 SetIcon(m_hIcon, TRUE); // Set big icon oJln"-M1nx  
 SetIcon(m_hIcon, FALSE); // Set small icon 0sGAC  
 m_Key.SetCurSel(0); ])D39  
 RegisterHotkey(); [ m#|[%  
 CMenu* pMenu=GetSystemMenu(FALSE);  Y!*F-v@  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); )zYm]\@  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); o3kVcX^  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); M_Z(+k{Gy  
 return TRUE; // return TRUE unless you set the focus to a control ]J)3y+;P  
} ffgb 3  
)4CF*>*6V  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (sN;B)  
{ SO8b~N  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) nhb: y  
 { 0fP-[7P  
  CAboutDlg dlgAbout; PZE{- TM?W  
  dlgAbout.DoModal(); 2PVtyV3;  
 } DB>.Uf"  
 else , HHCgN  
 { na-mh E,H  
  CDialog::OnSysCommand(nID, lParam); ZgH(,g,TU  
 } r]lPXj(`  
} h&O8e;S#  
{ 2\.  
void CCaptureDlg::OnPaint() ML-?#jNa<  
{  OK\F  
 if (IsIconic()) \Zbi`;m?  
 { D N#OLk  
  CPaintDC dc(this); // device context for painting R\^XF8n6/  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); N}5'Hk4+  
  // Center icon in client rectangle tShyG! b  
  int cxIcon = GetSystemMetrics(SM_CXICON); .Mz'h 9@  
  int cyIcon = GetSystemMetrics(SM_CYICON); X J{b_h#N  
  CRect rect; :0'2m@x~  
  GetClientRect(&rect); ed:[^#Lj  
  int x = (rect.Width() - cxIcon + 1) / 2; .^aqzA=]  
  int y = (rect.Height() - cyIcon + 1) / 2;  *CS2ndp  
  // Draw the icon T]0H&Oov  
  dc.DrawIcon(x, y, m_hIcon); V<W$ h`  
 } c D0-g=&  
 else u>-pg u  
 { 7f,!xh$  
  CDialog::OnPaint(); hH])0C  
 } e3!0<A[X  
} Z @d(0 z  
6-!U\R2Z>  
HCURSOR CCaptureDlg::OnQueryDragIcon() u/S{^2`b  
{ .]D7Il  
 return (HCURSOR) m_hIcon; (//f"c]/  
} TeXt'G=M  
@kmOz(  
void CCaptureDlg::OnCancel() 3rh@|fg)E  
{ "CcdwWM  
 if(bTray) OD~B2MpM>  
  DeleteIcon(); ~;uc@GGo  
  CDialog::OnCancel(); 2?./S)x)  
} eGr;PaG  
K|^'`FpPO  
void CCaptureDlg::OnAbout() gSn9L)k(O  
{ /.>8e%)  
 CAboutDlg dlg; G}8Zkz@+  
 dlg.DoModal(); _&xi})E^O]  
} 6X`i*T$.  
|jT^[q(z  
void CCaptureDlg::OnBrowse() -H-:b7  
{ <]e0TU?bk  
 CString str; b`yb{& ,?  
 BROWSEINFO bi; jSc!"Trl]  
 char name[MAX_PATH]; waRK$/b (  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); PTZ/j g@71  
 bi.hwndOwner=GetSafeHwnd(); |ryV7VJ8  
 bi.pszDisplayName=name; |'ML )`c[  
 bi.lpszTitle="Select folder"; *47',Qy  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; "Di8MMGOY  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); q47:kB{d  
 if(idl==NULL) _G0_<WH6  
  return; T_3JAH e  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Ww)p&don  
 str.ReleaseBuffer(); , tb\^  
 m_Path=str; +$y%H  
 if(str.GetAt(str.GetLength()-1)!='\\') {2,vxGi  
  m_Path+="\\"; 9?J 3G,&  
 UpdateData(FALSE); X" m0||  
} 'ugc=-0pd  
AAW])c`.  
void CCaptureDlg::SaveBmp() J,SP1-L  
{ mtd ,m  
 CDC dc; ~dz,eB  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); K~6,xZlDWM  
 CBitmap bm; {Uj-x -  
 int Width=GetSystemMetrics(SM_CXSCREEN); HY!R|  
 int Height=GetSystemMetrics(SM_CYSCREEN); u(W+hdTap=  
 bm.CreateCompatibleBitmap(&dc,Width,Height); |^k&6QO5  
 CDC tdc; l2Pry'3  
 tdc.CreateCompatibleDC(&dc); s:ZYiZ-  
 CBitmap*pOld=tdc.SelectObject(&bm); d.3cd40Q  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); M%(^GdI#Vf  
 tdc.SelectObject(pOld); CyXFuk!R  
 BITMAP btm; hteAuz4H  
 bm.GetBitmap(&btm); EJ@&vuDd$  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; I6-.;)McO  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); s{9 G//  
 BITMAPINFOHEADER bih; sFbN)Cx  
 bih.biBitCount=btm.bmBitsPixel; BL[N  
 bih.biClrImportant=0; ``:+*4e9  
 bih.biClrUsed=0; Cno+rmsfT  
 bih.biCompression=0; OUFx M  
 bih.biHeight=btm.bmHeight; |w].*c}Z  
 bih.biPlanes=1; r?2EJE2{V  
 bih.biSize=sizeof(BITMAPINFOHEADER); h"3Mj*s  
 bih.biSizeImage=size; a${<~M hm  
 bih.biWidth=btm.bmWidth; H5!e/4iz  
 bih.biXPelsPerMeter=0; i9koh3R\  
 bih.biYPelsPerMeter=0; f>hA+  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); VS jt|F)t  
 static int filecount=0; i@m@]-2  
 CString name; 'zhv#&O  
 name.Format("pict%04d.bmp",filecount++); L.?QZN%cN  
 name=m_Path+name; Lvd es.0|  
 BITMAPFILEHEADER bfh; K 7 OIT2-  
 bfh.bfReserved1=bfh.bfReserved2=0; W7#dc89}  
 bfh.bfType=((WORD)('M'<< 8)|'B'); A@<a')#>)  
 bfh.bfSize=54+size; z3Zo64V~7  
 bfh.bfOffBits=54; r t0_[i  
 CFile bf; !rsGCw!Pg  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Ji)Ys ebV  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ]_(J8v  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); _J"fgxW  
  bf.WriteHuge(lpData,size); ^).  
  bf.Close(); ~JQ6V?fucD  
  nCount++; LU $=j  
 } ")YD~ZA%)  
 GlobalFreePtr(lpData); =&I9d;7  
 if(nCount==1) cDIZkni=  
  m_Number.Format("%d picture captured.",nCount); g{^~g  
 else I%:\"g"c  
  m_Number.Format("%d pictures captured.",nCount); es^@C9qt  
  UpdateData(FALSE); UR~s\m  
} P W_"JZ  
N 9W,p 2  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) bH.SUd)  
{ =m;,?("7t3  
 if(pMsg -> message == WM_KEYDOWN) [vqf hpz  
 { |Iknk,  
  if(pMsg -> wParam == VK_ESCAPE) Z4oD6k5oc  
   return TRUE; *,|x p  
  if(pMsg -> wParam == VK_RETURN) E#R1  
   return TRUE; mw&'@M_(7  
 } h~lps?.#b  
 return CDialog::PreTranslateMessage(pMsg); 6UI6E)g  
} H<3:1*E  
y$+=>p|d.^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ,T*\9' Q  
{ :T{VCw:*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ d uP0US  
  SaveBmp(); K@%gvLa\  
  return FALSE; (&SPMhs_|(  
} D#P]tt.Z   
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ zZ,"HY=jN  
 CMenu pop; R^B8** N  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); w75Ro6y  
 CMenu*pMenu=pop.GetSubMenu(0); 0V?7'Em  
 pMenu->SetDefaultItem(ID_EXITICON); ^ WF_IH&  
 CPoint pt; P?^%i  
 GetCursorPos(&pt); k t'[  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); *{,}pK2*  
 if(id==ID_EXITICON) g/(BV7V  
  DeleteIcon(); +/ {lz8^,  
 else if(id==ID_EXIT) jvxCCYXR  
  OnCancel(); ;l^'g}dQ^  
 return FALSE; E 6+ ooB[  
} +koW3>  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -24ccN;  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 1B gHkDW  
 AddIcon(); HQwrb HS  
 return res; F"cZ$TL]  
} cc3/XBo  
Xvk+1:D  
void CCaptureDlg::AddIcon() J:J/AgJuH  
{ Qsw.429t  
 NOTIFYICONDATA data; IwBO#HR~)  
 data.cbSize=sizeof(NOTIFYICONDATA); F|cli <  
 CString tip; )3R5cq  
 tip.LoadString(IDS_ICONTIP); EI)2 c.A  
 data.hIcon=GetIcon(0); (&u'S+  
 data.hWnd=GetSafeHwnd(); }u8g7Nj  
 strcpy(data.szTip,tip); 4T$DQK@e  
 data.uCallbackMessage=IDM_SHELL; R#i`H(N  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; RP^vx`9h  
 data.uID=98; 'v@*xF/L6a  
 Shell_NotifyIcon(NIM_ADD,&data); O\gVB!x  
 ShowWindow(SW_HIDE); &-w.rF@  
 bTray=TRUE; ]q"y P 0  
} wz{c;v\J^  
*CbV/j"P?  
void CCaptureDlg::DeleteIcon() _h`4`r  
{ :Gzp (@<@e  
 NOTIFYICONDATA data; f]mVM(XZN  
 data.cbSize=sizeof(NOTIFYICONDATA); R\Ckk;<$  
 data.hWnd=GetSafeHwnd(); OI8}v  
 data.uID=98; \%9QE  
 Shell_NotifyIcon(NIM_DELETE,&data); acgx')!c  
 ShowWindow(SW_SHOW); dWu;F^  
 SetForegroundWindow(); Lxv6\3I+  
 ShowWindow(SW_SHOWNORMAL); =p7id5"  
 bTray=FALSE; ?*[35XUd  
} sl"H!cwF  
2Q7X"ek~[  
void CCaptureDlg::OnChange() p$ETAvD  
{  -PU.Uw]  
 RegisterHotkey(); ;@:-T/=  
} &;`E3$>  
l_8ibLyo  
BOOL CCaptureDlg::RegisterHotkey() aL&9.L|1 g  
{ jW4>WDN:  
 UpdateData(); O<$j}?2  
 UCHAR mask=0; mB6%. "  
 UCHAR key=0; uHRxV"@}[1  
 if(m_bControl) zD<8.AIGC  
  mask|=4; t @a&&  
 if(m_bAlt) 1 .[OS  
  mask|=2; V#+F*w?&D  
 if(m_bShift) M ac?HI  
  mask|=1; Rlm28  
  key=Key_Table[m_Key.GetCurSel()]; NxDVU?@p*  
 if(bRegistered){ |/$954Hr#<  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 6#.9T;&  
  bRegistered=FALSE; bE@Eiac  
 } [ wnaF|h  
 cMask=mask; f"NWv!  
 cKey=key; 9'e<{mlM  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); FFe{=H,=  
 return bRegistered; }f% Qk0^  
} H0yM`7[y  
d0f(Uk  
  四、小结 Z c#Jb  
Sfp-ns32%A  
  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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