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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: EY3x o-H  
  8: #\g  
  一、实现方法 RF3?q6j ,  
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  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: DI9hy/T(  
<//82j+px  
#pragma data_seg("shareddata") eKRslMa  
HHOOK hHook =NULL; //钩子句柄 mL5Nu+#  
UINT nHookCount =0; //挂接的程序数目 j /d? c5  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 (PVK|Q55y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 vjo@aY.x  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey j^4KczJl  
static int KeyCount =0; zk6al$3R  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 RYhaQ &1i  
#pragma data_seg() )"( ojh  
8aDSRfv*  
  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。 hz:^3F`>/&  
$'Pn(eZHGv  
  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: 0!4;."S  
G.j  R  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR S8=Am7D]1  
cKey,UCHAR cMask) $ghAC  
{ m(2(Caz{  
 BOOL bAdded=FALSE; 6d4e~F  
 for(int index=0;index<MAX_KEY;index++){  Om%HrT  
  if(hCallWnd[index]==0){ c}XuzgSY  
   hCallWnd[index]=hWnd; 2bJqZ,@  
   HotKey[index]=cKey; Lj]I7ICNh  
   HotKeyMask[index]=cMask; .&z/p3 1  
   bAdded=TRUE; ! z!lQ~  
   KeyCount++; J#k3iE}  
   break; Qu 7#^%=  
  } )gX7qQ  
 } z@70{*  
 return bAdded; 4}i2j  
} SW94(4qo  
//删除热键 LwPZRE#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) fj 14'T  
{ _:R Q9x'  
 BOOL bRemoved=FALSE; gK&MdF*  
 for(int index=0;index<MAX_KEY;index++){ l ~bjNhk  
  if(hCallWnd[index]==hWnd){ )7X+T'?%  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ B: '}SA{  
    hCallWnd[index]=NULL; 6CQ.>M:R  
    HotKey[index]=0; 72i ]`   
    HotKeyMask[index]=0; -|1H-[Y(  
    bRemoved=TRUE; w@K4u{|  
    KeyCount--; f+ }Rj0A  
    break; |_<'q h  
   } d3nx"=Cy0I  
  } t=-t xnlr<  
 } nqp:nw  
 return bRemoved; cImOZx  
} jCJbmEfo9@  
<5 Ye')+  
WA'&0i4  
  DLL中的钩子函数如下: A$6T)  
X jJV  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) trl:\m  
{ ZQL4<fy'E  
 BOOL bProcessed=FALSE; [Ej#NHs  
 if(HC_ACTION==nCode) \BRx dK'  
 { UxGr+q  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 K;n2mXYGM  
   switch(wParam) D]n"`< Ho  
   {  =)h<" 2  
    case VK_MENU: p3m!Iota  
     MaskBits&=~ALTBIT; mbf'xGO  
     break; ;-aF\}D@n  
    case VK_CONTROL: /]xu=q2  
     MaskBits&=~CTRLBIT; knX*fp  
     break; Ffv v8x  
    case VK_SHIFT: 8vk*",  
     MaskBits&=~SHIFTBIT; X2RM*y|  
     break; /0S2Om h  
    default: //judge the key and send message DGs=.U-=e  
     break; {S9't;%]  
   } ">8]Oi;g  
   for(int index=0;index<MAX_KEY;index++){ 2#srecIz-!  
    if(hCallWnd[index]==NULL) >AtW  
     continue; b `W2^/D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3 s@6pI  
    { ^)JUl!5j]C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @ij8AGE:  
     bProcessed=TRUE; oVD)Fb%[i9  
    } u~uR:E%'C  
   } Q140b;Z  
  } Sckt gp8  
  else if((lParam&0xc000ffff)==1){ //有键按下 DH@]d0N  
   switch(wParam) >A]U.C  
   { A?YU:f  
    case VK_MENU: 3`Ug]<m  
     MaskBits|=ALTBIT; Y)Os]<N1  
     break; xSf&*wLE  
    case VK_CONTROL: KA[8NPhzZ  
     MaskBits|=CTRLBIT; I.4o9Z[?  
     break; 8!R +wy  
    case VK_SHIFT: Moldv x=M  
     MaskBits|=SHIFTBIT; A`5/u"]*D  
     break;  (0wQ [(  
    default: //judge the key and send message "e3T;M+  
     break; i 4}4U  
   } 31y>/*}  
   for(int index=0;index<MAX_KEY;index++){ x4_xl .  
    if(hCallWnd[index]==NULL) >5O#_?  
     continue; |D@/4B1P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fZq_]1(/uP  
    { \Zn%r&(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); "k;j@  
     bProcessed=TRUE; )}Vb+  
    } Bq l 5=p  
   } _v[yY3=3  
  } ~o <+tL  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 B}:/2?gQ  
   for(int index=0;index<MAX_KEY;index++){ $!'S7;*uW  
    if(hCallWnd[index]==NULL) /k$H"'`j4  
     continue; 'aN`z3T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #mK/xbW  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); kVqRl%/3Tb  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 3 L:s5  
   } #Epx'$9  
  } 5qe6/E@  
 } !ek};~(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %(P\"hE'  
} 6'F4p1VG*I  
'\,|B x8Q  
  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: ?k 4|;DD  
Iu)76Y@=5=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); M%3P@GRg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &8!~H<S  
A89n^@  
  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: ]* #k|>Fl  
Np.] W(  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @5[9iY  
{ v^;p]_c~2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) T?DX|?2X  
 { 'j#J1 xwJ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 oP"X-I  
  SaveBmp(); Au=9<WB%H  
  return FALSE; Q#h*C ZT  
 } zXEu3h  
 …… //其它处理及默认处理 MF41q%9p  
} y8HwyU>  
K3;lst>4  
rUz-\H(-  
  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。 doX8Tq   
G $F3dx.I  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 San=E@3}v!  
sC< B  
  二、编程步骤 }C'H@:/  
#GlQwk3  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 5n1aRA1  
Qf'%".*=~8  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; <=yqV]JR  
1DTA Dh0  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; t_+Xt$Q7C  
='\Di '*  
  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; +L]$M)*0&  
TV['"'D&i  
  5、 添加代码,编译运行程序。 cu@i;Hb@  
{9,!XiF.:  
三、程序代码 )-u0n] ,  
9>OPaL n  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL <'N(`.&3C  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 4 g%BCGsys  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ kp$w)%2JW  
#if _MSC_VER > 1000 &Q>tV+*  
#pragma once k^%Kw(/  
#endif // _MSC_VER > 1000 fqY; > Z  
#ifndef __AFXWIN_H__ ^^;#Si  
#error include 'stdafx.h' before including this file for PCH 9_4bw9 A  
#endif nYvx[ zq?^  
#include "resource.h" // main symbols MB"TwtW  
class CHookApp : public CWinApp y$Y*%D^w  
{ ov9+6'zya  
 public: "R!) "B==  
  CHookApp(); 'f "KV|  
  // Overrides !EuqJjh  
  // ClassWizard generated virtual function overrides 8NUVHcB6  
  //{{AFX_VIRTUAL(CHookApp) e Lj1  
 public: f~rq)2V:  
  virtual BOOL InitInstance();  W>HGB  
  virtual int ExitInstance(); 2C &G' @>  
  //}}AFX_VIRTUAL q!y6 K*  
  //{{AFX_MSG(CHookApp) :|5 \XV)>  
  // NOTE - the ClassWizard will add and remove member functions here. O^L#(8bC  
  // DO NOT EDIT what you see in these blocks of generated code ! jMAZ4M  
  //}}AFX_MSG sx]kH$  
  DECLARE_MESSAGE_MAP() ?nwFc3qw  
}; 5.TeH@(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 3+uCTn0%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x Ilo@W6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1[ 4)Sq?  
BOOL InitHotkey(); *^@{LwY\M  
BOOL UnInit(); d'okXCG  
#endif gR]NH  
oR1HJ2>Z1  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. %Ums'<xJ  
#include "stdafx.h" e6(Pw20)s  
#include "hook.h" [ e6zCN^t  
#include <windowsx.h> ;WqWD-C  
#ifdef _DEBUG vUNmN2pRJ  
#define new DEBUG_NEW Nj^:8]D)0  
#undef THIS_FILE ib,BYFKEW  
static char THIS_FILE[] = __FILE__; fK?/o]vq  
#endif "B34+fOur  
#define MAX_KEY 100 Y48MCL  
#define CTRLBIT 0x04 c2o.H!>  
#define ALTBIT 0x02 -yJ%G1R  
#define SHIFTBIT 0x01 "N*bV  
#pragma data_seg("shareddata") dU"ca|u  
HHOOK hHook =NULL; IHs^t/;Iv  
UINT nHookCount =0; F^/b!)4X  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey f7y3BWOi]  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT  L#>^R   
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 4]P5k6 nV  
static int KeyCount =0; ToXgl4:kd  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift !VoAN5#;  
#pragma data_seg() R2` -*PZ_  
HINSTANCE hins; (]}52%~  
void VerifyWindow(); v|K'M,E  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 6 *GR_sMm  
//{{AFX_MSG_MAP(CHookApp) Ks>l=5~v|  
// NOTE - the ClassWizard will add and remove mapping macros here. S5(VdMd"^  
// DO NOT EDIT what you see in these blocks of generated code! t~0!K;nn  
//}}AFX_MSG_MAP m,X8Cy|vQ  
END_MESSAGE_MAP() KccIYn~  
\}p!S$`  
CHookApp::CHookApp() oWP3Y.  
{ ~B704i  
 // TODO: add construction code here, <{Pr(U*7}  
 // Place all significant initialization in InitInstance 7J6D wh{  
} m(0c|-  
+~{Honj[  
CHookApp theApp; vWh]1G#'p[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) &&s3>D^Ta  
{ f$|AU- |<  
 BOOL bProcessed=FALSE; qZwqnH  
 if(HC_ACTION==nCode) t"Tv(W?_  
 { t8:QK9|1  
  if((lParam&0xc0000000)==0xc0000000){// Key up m~;}8ObQE  
   switch(wParam) R<eD)+  
   { IJQ" *;  
    case VK_MENU: O+w82!<:  
     MaskBits&=~ALTBIT; 5 >c,#*  
     break; W3M1> (  
    case VK_CONTROL: 5B)z}g^h  
     MaskBits&=~CTRLBIT; 3X>x`  
     break; ->S# `"@$  
    case VK_SHIFT: w40 -K5wt>  
     MaskBits&=~SHIFTBIT; )xxpO$  
     break; \ y}!yrQ  
    default: //judge the key and send message _+*+,Vx  
     break; vP. ^j7wB  
   } \&jmSa=]l  
   for(int index=0;index<MAX_KEY;index++){ pj9*$.{  
    if(hCallWnd[index]==NULL) ] i:WP2  
     continue; DPg\y".4Y&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) WV?3DzeR  
    { 0vjlSHS;`.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .kf FaK  
     bProcessed=TRUE; ~C31=\$  
    } |1/UC"f  
   } ;%`oS.69  
  } q dQQt5Y'm  
  else if((lParam&0xc000ffff)==1){ //Key down 98ot{+/LK  
   switch(wParam) -`s_md0BM  
   { AbA_s I<;  
    case VK_MENU: !V~,aoKTj  
     MaskBits|=ALTBIT; g)`;m%DG6  
     break; T? e(m  
    case VK_CONTROL: 2qgm(jo *y  
     MaskBits|=CTRLBIT; y{k65dk-  
     break; `"s*'P398  
    case VK_SHIFT: 3X:)r<  
     MaskBits|=SHIFTBIT; k,h /B  
     break; jnzOTS   
    default: //judge the key and send message 9=5xt;mEs}  
     break; /!A?>#O&.  
   } O]cuJp  
   for(int index=0;index<MAX_KEY;index++) {Q~HMe`,  
   {  c_ Dg0  
    if(hCallWnd[index]==NULL) bD:[r))#e  
     continue; $GJuS^@%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &$NYZ3?9  
    { /3KPK4!m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |x+g5~$  
     bProcessed=TRUE; jxdX7aik  
    } NjH` AMGBT  
   } A9 ;!\Wo  
  } r>,s-T!7  
  if(!bProcessed){ f=T-4Of  
   for(int index=0;index<MAX_KEY;index++){ w,!IvDCAw  
    if(hCallWnd[index]==NULL) Y2d(HD@  
     continue; m4_ZGjmJM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Em]2K:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5D6 ,B  
   } ,ui=Wi1  
  } _)XZ;Q  
 } !lxq,Whr{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); k}hTSL  
} G<W;HMj2  
m'PU0x  
BOOL InitHotkey() T8W;Lb9hQ  
{ E]c0+rh~  
 if(hHook!=NULL){ }l<:^lX  
  nHookCount++; ko+fJ&$  
  return TRUE; TMw6 EM  
 } }MIg RQ9  
 else X0 ^~`g  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); EN/r{Cm$B  
  if(hHook!=NULL) mhW*rH*m  
   nHookCount++; }Hy4^2B  
  return (hHook!=NULL); /*1p|c^  
} ! z6T_;s  
BOOL UnInit() 9$s~ `z)  
{ 4o3TW#  
 if(nHookCount>1){ =Y {<&:%(  
  nHookCount--; _@@.VmZL  
  return TRUE; sIzy/W0iV  
 } M{4U%lk  
 BOOL unhooked = UnhookWindowsHookEx(hHook); b<27XZ@  
 if(unhooked==TRUE){ wBI>H 7A  
  nHookCount=0; A/sM ?!p>_  
  hHook=NULL; &HB!6T/  
 } | {Tq/  
 return unhooked; W4p4[&c|  
} Qpocj:  
$nqVE{ksV  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) YLv5[pV  
{ VM}7 ~  
 BOOL bAdded=FALSE; @ D.MpM}~  
 for(int index=0;index<MAX_KEY;index++){ `q m$2  
  if(hCallWnd[index]==0){ +5"Pm]oRbx  
   hCallWnd[index]=hWnd; N1yx|g:  
   HotKey[index]=cKey; $!7$0WbC  
   HotKeyMask[index]=cMask; 5kLz8n^z@@  
   bAdded=TRUE; JXQh$hs  
   KeyCount++; HlOn=>)<  
   break; U(:Di]>{  
  } %\] x}IC  
 } trz &]v=:  
 return bAdded; |a!]Iqz"N  
} @kWRI*m  
z#*> u  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,FL*Z9wA  
{ 3YD.Fjz$  
 BOOL bRemoved=FALSE; xQDWnpFc  
 for(int index=0;index<MAX_KEY;index++){ #<DS-^W!  
  if(hCallWnd[index]==hWnd){ x4XCR,-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ dLbSvK<(I  
    hCallWnd[index]=NULL; yYiu69v  
    HotKey[index]=0; V*gh"gZ<  
    HotKeyMask[index]=0; _)ZxD--Qg  
    bRemoved=TRUE; ;T :]?5W!  
    KeyCount--; pEq }b+-  
    break; in7h^6?I  
   } zuS4N?t`p  
  } uc Ph*M  
 } B &e'n<  
 return bRemoved; *~kHH  
} |f3 :9(p  
UsgrI>|l  
void VerifyWindow() TjS &V  
{ G=PX'dS  
 for(int i=0;i<MAX_KEY;i++){ .`jYrW-k  
  if(hCallWnd!=NULL){ (*Z:ByA  
   if(!IsWindow(hCallWnd)){ ?T)M z q}  
    hCallWnd=NULL; GL,( N|  
    HotKey=0; e=`=7H4P  
    HotKeyMask=0; IL{tm0$r  
    KeyCount--; +-NH 4vUg  
   } Hm'aD2k  
  } +!mEP>  
 } =Q#d0Q  
} 2H/{OQ$  
mo"1|Q&  
BOOL CHookApp::InitInstance() y\_k8RqE^  
{ SBg|V  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 20/P:;  
 hins=AfxGetInstanceHandle(); <>H^:iqn  
 InitHotkey(); jI%glO'2  
 return CWinApp::InitInstance(); [ d`m)MW-  
} Nxr\Yey  
=wlPm5  
int CHookApp::ExitInstance() JPM~tp?;<  
{ fZb}-  
 VerifyWindow(); Gn^m541  
 UnInit(); $"ACg!=M  
 return CWinApp::ExitInstance(); ;tC$O~X  
} JHa\"h  
N(%(B  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ZF@$3   
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Of>2m<  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ \. a7F4h  
#if _MSC_VER > 1000 [1e]_9)p  
#pragma once W5>emx'>  
#endif // _MSC_VER > 1000 +K?sg;  
wz>[CXpi_  
class CCaptureDlg : public CDialog B Q2N_*v  
{ N@X(YlO  
 // Construction hdwF;  
 public: Nu euCiP  
  BOOL bTray; xdh%mG:?  
  BOOL bRegistered; \ 027>~u {  
  BOOL RegisterHotkey(); JCci*F#r  
  UCHAR cKey; NAOCQDk{  
  UCHAR cMask; 7^C&2k 5G  
  void DeleteIcon(); iN_P25Z<r  
  void AddIcon(); gYBMi)`RT  
  UINT nCount; v.hQ 9#:  
  void SaveBmp(); $HCgawQ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor }Fsr"RER@{  
  // Dialog Data C;~LY&=  
  //{{AFX_DATA(CCaptureDlg) tIS.,CEQF  
  enum { IDD = IDD_CAPTURE_DIALOG }; [I}z\3Z %  
  CComboBox m_Key; f)mOeD*u|  
  BOOL m_bControl; 0Oa&vx  
  BOOL m_bAlt; -us:!p1T  
  BOOL m_bShift; [5]n,toAh  
  CString m_Path; v#?;PyeF  
  CString m_Number;  dZX;k0  
  //}}AFX_DATA 'Y/kF1,*  
  // ClassWizard generated virtual function overrides &Q*  7  
  //{{AFX_VIRTUAL(CCaptureDlg) Zv(6VVj  
 public: ^6J*:(eM  
  virtual BOOL PreTranslateMessage(MSG* pMsg); *4%%^*g.I  
 protected: A0OA7m:~4  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support GK;IY=8W  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); F\^\,hy  
  //}}AFX_VIRTUAL ^7yaM B!  
  // Implementation hkdF  
 protected: FY`t7_Y?GV  
  HICON m_hIcon; +X`&VO6~  
  // Generated message map functions #8~ygEa}  
  //{{AFX_MSG(CCaptureDlg) KTBtLUH]*F  
  virtual BOOL OnInitDialog(); }I1j#d0.  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); sOb]o[=  
  afx_msg void OnPaint(); hM[3l1o{|  
  afx_msg HCURSOR OnQueryDragIcon(); *qu5o5Q  
  virtual void OnCancel(); eL.WP`Lz  
  afx_msg void OnAbout(); 4o"?QV:  
  afx_msg void OnBrowse(); 0f@9y  
  afx_msg void OnChange(); 6)BPDfU,  
 //}}AFX_MSG _%Yi ^^  
 DECLARE_MESSAGE_MAP() Uq~b4X$  
}; UD.ZnE{"  
#endif efE=5%O  
":q+"*fy  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file *Ms&WYN-  
#include "stdafx.h" I;n <) >  
#include "Capture.h" B&_Z&H=  
#include "CaptureDlg.h" I0qJr2[X~  
#include <windowsx.h> I1rB,%p  
#pragma comment(lib,"hook.lib") ;&'ryYrex  
#ifdef _DEBUG Gpi_p  
#define new DEBUG_NEW ,Xr`tQ<@  
#undef THIS_FILE bI`JG:^b  
static char THIS_FILE[] = __FILE__; 0 /9 C=v  
#endif |3 Iug  
#define IDM_SHELL WM_USER+1 [4aw*M1z}.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]0BX5Z'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); R.DUfU"gp  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; \98N8p;,I  
class CAboutDlg : public CDialog ><S(n#EB  
{ 8_ o~0lb  
 public: |5ge4,}0  
  CAboutDlg(); 3rd8mh&l  
  // Dialog Data c&,q`_t  
  //{{AFX_DATA(CAboutDlg) Z} t^i^u  
  enum { IDD = IDD_ABOUTBOX }; q"oNFHYPDs  
  //}}AFX_DATA W\j)Vg__e  
  // ClassWizard generated virtual function overrides TD%L`Gk  
  //{{AFX_VIRTUAL(CAboutDlg) B?yj U[/R  
 protected: <1B+@  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support y?P`vHf  
  //}}AFX_VIRTUAL p w5{=bD  
  // Implementation k2tSgJW  
 protected: Od ^Sr4C  
  //{{AFX_MSG(CAboutDlg) -Sn'${2  
  //}}AFX_MSG LAY:R{vI  
  DECLARE_MESSAGE_MAP() AJE$Z0{q  
}; w^("Pg`  
U=7nz|  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) dsj}GgG?Z  
{ 0TSB<,9a[  
 //{{AFX_DATA_INIT(CAboutDlg) }/h&`0z `  
 //}}AFX_DATA_INIT t72rCq QC  
} 3~V .  
Lis>Qr  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 13w(Tf  
{ $zU%?[J  
 CDialog::DoDataExchange(pDX); e$2P/6k>  
 //{{AFX_DATA_MAP(CAboutDlg) O1)\!=& .  
 //}}AFX_DATA_MAP T ,jb%uPcE  
} sHMO9{[7H  
VumM`SH  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) k#u)+e.'  
 //{{AFX_MSG_MAP(CAboutDlg) D6|-nl  
 // No message handlers  I8`$a  
 //}}AFX_MSG_MAP nm& pn*1  
END_MESSAGE_MAP() MB $aN':  
<VQ)}HW;k  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) E/*&'Osq  
: CDialog(CCaptureDlg::IDD, pParent) cIG7 Q"4  
{ "a}fwg9Y  
 //{{AFX_DATA_INIT(CCaptureDlg) z6rT<~xZtu  
  m_bControl = FALSE; i;s;:{cn  
  m_bAlt = FALSE; Pr(@&:v:  
  m_bShift = FALSE; { PJ>gX$  
  m_Path = _T("c:\\"); ,G5[?H;ZN  
  m_Number = _T("0 picture captured."); mw}Bl; - O  
  nCount=0; [ p~,;%  
  bRegistered=FALSE; nxx/26{  
  bTray=FALSE; 3-,W? "aC  
 //}}AFX_DATA_INIT !lo /L  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 al-rgh  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); NdSuOkwwt  
} Ej 5_d  
x#N_h0[i  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) yjMN>L'  
{ deVnAu =  
 CDialog::DoDataExchange(pDX); y+w,j]  
 //{{AFX_DATA_MAP(CCaptureDlg) {j;` wN  
  DDX_Control(pDX, IDC_KEY, m_Key); ZTz07Jt  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); |FM*1Q[1  
  DDX_Check(pDX, IDC_ALT, m_bAlt); <Z<meB[g  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); a'/i/@h  
  DDX_Text(pDX, IDC_PATH, m_Path); qk3|fW/-  
  DDX_Text(pDX, IDC_NUMBER, m_Number); DcdEt=\)h  
 //}}AFX_DATA_MAP Hh*?[-&r~  
} xE]y*\  
yz=X{p1  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) i%i />;DF  
//{{AFX_MSG_MAP(CCaptureDlg) 1JfZstT  
 ON_WM_SYSCOMMAND() 0Ci/-3HV!  
 ON_WM_PAINT() f,Dic%$q  
 ON_WM_QUERYDRAGICON()  X(X[v]  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ,Kl?-W@  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) rF"p7  
 ON_BN_CLICKED(ID_CHANGE, OnChange) uOJqj{k_."  
//}}AFX_MSG_MAP Iv*\8?07)  
END_MESSAGE_MAP() FVBAB>   
0V21_".S  
BOOL CCaptureDlg::OnInitDialog() >5:O%zQ@  
{ zBTW&  
 CDialog::OnInitDialog(); : ?BK A0E  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); S\< i`q  
 ASSERT(IDM_ABOUTBOX < 0xF000); ^.\O)K {h  
 CMenu* pSysMenu = GetSystemMenu(FALSE); M}#DX=NZc  
 if (pSysMenu != NULL) dpsc gW{M  
 { )7NI5x^$  
  CString strAboutMenu; $--+M D29Q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 5B4/2q=  
  if (!strAboutMenu.IsEmpty()) r{9fm,  
  { X!^|Tass  
   pSysMenu->AppendMenu(MF_SEPARATOR); Q=fl!>P  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); dzPewOre*  
  } z'& fEsjy  
 } megTp  
 SetIcon(m_hIcon, TRUE); // Set big icon AH5;6Q  
 SetIcon(m_hIcon, FALSE); // Set small icon htR.p7&Tn  
 m_Key.SetCurSel(0); p/VVb%  
 RegisterHotkey(); QAp]cE1ew  
 CMenu* pMenu=GetSystemMenu(FALSE); 0]iaNR %  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); #Gg^QJ*  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ,NS*`F[O  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ?z&%VU"  
 return TRUE; // return TRUE unless you set the focus to a control 7 [1|(6$  
} iW>^'W#  
%kV7 <:y  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ,>S7c  
{ cPNc$^Y  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) =urGs`\  
 { 4}v|^_x-i  
  CAboutDlg dlgAbout; ;-kDJ i  
  dlgAbout.DoModal(); BR@m*JGajz  
 } 0FI |7  
 else -|KZOea  
 { PBCGC^0{  
  CDialog::OnSysCommand(nID, lParam); ix4]^  
 } Z%B6J>;uM  
} X(*O$B{ R  
bNVeL$'  
void CCaptureDlg::OnPaint() w,FPL&{  
{ &4S2fWx  
 if (IsIconic()) L}Y.xi  
 { jJNCNH*0  
  CPaintDC dc(this); // device context for painting z_fjmqa?  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); -HQbvXAS  
  // Center icon in client rectangle {D Q%fneN4  
  int cxIcon = GetSystemMetrics(SM_CXICON); xi(\=LbhY  
  int cyIcon = GetSystemMetrics(SM_CYICON); o25rKC=o  
  CRect rect; Lm2) 3;ei  
  GetClientRect(&rect); UWvVYdy7  
  int x = (rect.Width() - cxIcon + 1) / 2; ]{\ttb%GX  
  int y = (rect.Height() - cyIcon + 1) / 2; I"vkfi#=  
  // Draw the icon X]D,kKasG  
  dc.DrawIcon(x, y, m_hIcon); DI{*E  
 } ;s/<wx-C  
 else /~{`!30  
 { Rt+-ud{O  
  CDialog::OnPaint(); > ]^'h  
 } uI/ wR!  
} G#GZt\)F  
71{jedT  
HCURSOR CCaptureDlg::OnQueryDragIcon() A+0-pF2D  
{ r.\L@Y<  
 return (HCURSOR) m_hIcon; K8&;B)VT>  
} % (y{Sca  
V&s|IoTR  
void CCaptureDlg::OnCancel() za@/4z  
{ uwSSrT  
 if(bTray) 0>N6.itOz  
  DeleteIcon(); J4"Fj, FS  
  CDialog::OnCancel(); }r5yAE  
} MkPQ@so  
KddCR&  
void CCaptureDlg::OnAbout() 6D`n^uoP  
{ nOL"6%q  
 CAboutDlg dlg; $0E+8xE  
 dlg.DoModal(); Xi98:0<=  
} 0yI1r7yNB+  
njaMI8|Pa  
void CCaptureDlg::OnBrowse() Q7$o&N{  
{ "a8E0b  
 CString str; .PUp3X-  
 BROWSEINFO bi; !{t|z=Qg  
 char name[MAX_PATH]; `Zm6e!dH-  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 1^}I?PbqV  
 bi.hwndOwner=GetSafeHwnd(); ^ U*y*l$  
 bi.pszDisplayName=name; *(?Wzanh  
 bi.lpszTitle="Select folder"; 3uqhYT;  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Ww2@!ng  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); _xp8*2~-  
 if(idl==NULL) RDp  
  return; (O5Yd 6u  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); *{DTxEy  
 str.ReleaseBuffer(); :lcq3iFn  
 m_Path=str; ^!&6 =rb  
 if(str.GetAt(str.GetLength()-1)!='\\') eMJ>gXA]  
  m_Path+="\\"; +1!iwmch>  
 UpdateData(FALSE); Dp ](?Yr  
} j ) 6  
tbd=A]B-  
void CCaptureDlg::SaveBmp() tTLg;YjN  
{ 0 5`"U#`:  
 CDC dc; lb-1z]YwQ  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); l?U=s7s0?  
 CBitmap bm; +nDy b  
 int Width=GetSystemMetrics(SM_CXSCREEN); [8i)/5D4  
 int Height=GetSystemMetrics(SM_CYSCREEN); g 4[Vgmh J  
 bm.CreateCompatibleBitmap(&dc,Width,Height); J, 9NVw$  
 CDC tdc; ##7y|AwK  
 tdc.CreateCompatibleDC(&dc); GkIY2PD  
 CBitmap*pOld=tdc.SelectObject(&bm); N7+L@CC6T  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 3 !@  
 tdc.SelectObject(pOld); "d_wu#fO)  
 BITMAP btm; YNEwX$)M,B  
 bm.GetBitmap(&btm); J~k9jeq9  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; XVYFyza;  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); @Nek;xJ  
 BITMAPINFOHEADER bih; /*mF:40M;  
 bih.biBitCount=btm.bmBitsPixel; hw^&{x  
 bih.biClrImportant=0; uw}Rr7q  
 bih.biClrUsed=0; <W"W13*j!  
 bih.biCompression=0; O,Q.-  
 bih.biHeight=btm.bmHeight; |`5 IP8Z  
 bih.biPlanes=1; ]dpL PR  
 bih.biSize=sizeof(BITMAPINFOHEADER); ;Y?MbD  
 bih.biSizeImage=size; hJ@vlMW  
 bih.biWidth=btm.bmWidth; ~|V^IJZ22  
 bih.biXPelsPerMeter=0; faDSyBLo  
 bih.biYPelsPerMeter=0; L (Y1ey9x  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ai{>rO3 }I  
 static int filecount=0; l#'V SFm&  
 CString name; i+*!" /De  
 name.Format("pict%04d.bmp",filecount++); P=QxfX0B  
 name=m_Path+name; 9r!8BjA  
 BITMAPFILEHEADER bfh; %=`JWLLG  
 bfh.bfReserved1=bfh.bfReserved2=0; kJWg},-\  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 7>JTQ CJ  
 bfh.bfSize=54+size; _v,0"_"  
 bfh.bfOffBits=54; hJb2y`,q  
 CFile bf; z%82Vt!a5  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 7z b^Z]  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); HEF e?  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); FZr/trP~  
  bf.WriteHuge(lpData,size); fjh|V9H  
  bf.Close(); C$OVN$lL`8  
  nCount++;  ?Y(  
 } ,QY$:f<  
 GlobalFreePtr(lpData); +1ICX  
 if(nCount==1) <+roY"  
  m_Number.Format("%d picture captured.",nCount); ->sxz/L  
 else lB,1dw2(T  
  m_Number.Format("%d pictures captured.",nCount); w&p+mJL.  
  UpdateData(FALSE); jf~](TK  
} k?+ 7%A]  
l|P"^;*zq  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) )kpEcMlR  
{ N~v6K}`}  
 if(pMsg -> message == WM_KEYDOWN) wVBK Vb9N  
 { i(}Pr A  
  if(pMsg -> wParam == VK_ESCAPE) pHV^K v#  
   return TRUE; r;#"j%z  
  if(pMsg -> wParam == VK_RETURN) (%my:\>l  
   return TRUE; i9;  
 } x[(6V'  
 return CDialog::PreTranslateMessage(pMsg); ?b (iWq  
} PsC")JS  
p}1i[//S  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p['RV  
{ f[@96p ?a[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ v"USD<   
  SaveBmp(); )9]a  
  return FALSE; d*@T30  
} e97G]XLR  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <xI<^r'C9e  
 CMenu pop; U"PcNQy  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); (2g a: }K  
 CMenu*pMenu=pop.GetSubMenu(0); ;8sL  
 pMenu->SetDefaultItem(ID_EXITICON); 0HzqU31%l@  
 CPoint pt; AkhG~L  
 GetCursorPos(&pt); 77P\:xc  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); <J/ =$u/  
 if(id==ID_EXITICON) o?`FjZ6;x  
  DeleteIcon(); W0qR? jc  
 else if(id==ID_EXIT) Z>hTL_|]a{  
  OnCancel(); ;*A'2ymXUT  
 return FALSE; q~ H>rC(\  
} x/*lNG/  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); to={q CqU  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Qs6<(zaqkt  
 AddIcon(); ,2@o`R.27  
 return res;  :Sq] |)  
} )GD7 rsC`<  
PTQ#8(_,  
void CCaptureDlg::AddIcon() Ds9)e&yYrb  
{ `2lS@  
 NOTIFYICONDATA data; W__ArV2Z_  
 data.cbSize=sizeof(NOTIFYICONDATA); #@R0$x  
 CString tip; B `(jTL  
 tip.LoadString(IDS_ICONTIP); Q+:y  
 data.hIcon=GetIcon(0); ] ; w 2YR  
 data.hWnd=GetSafeHwnd(); HI.*xkBXl&  
 strcpy(data.szTip,tip); 66yw[,Y  
 data.uCallbackMessage=IDM_SHELL; ]}2)U  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; w0Qtr>"  
 data.uID=98; ,;k+n)  
 Shell_NotifyIcon(NIM_ADD,&data); M(%H  
 ShowWindow(SW_HIDE); e &6%  
 bTray=TRUE; TZn 15-O  
} %w`d  
m'o dVZ7  
void CCaptureDlg::DeleteIcon() .wfydu)3  
{ SE'Im  
 NOTIFYICONDATA data; '6so(>|  
 data.cbSize=sizeof(NOTIFYICONDATA); g'"~'  
 data.hWnd=GetSafeHwnd(); #}`sfaT  
 data.uID=98; ~6G `k^!  
 Shell_NotifyIcon(NIM_DELETE,&data); &7L7|{18  
 ShowWindow(SW_SHOW); @X==[gQ  
 SetForegroundWindow(); 8&<mg;H,  
 ShowWindow(SW_SHOWNORMAL); jK|n^5\  
 bTray=FALSE; J4Gzp~{  
} *uvM6F$ut  
?uWUs )9  
void CCaptureDlg::OnChange() ,81%8r  
{  vy<W4  
 RegisterHotkey(); +|A`~\@N  
} 'Y 38VOI%  
]C_+u_9  
BOOL CCaptureDlg::RegisterHotkey() ]Q^)9uE\D  
{ YT\`R  
 UpdateData(); =[B\50]  
 UCHAR mask=0; 6=iHw 24  
 UCHAR key=0; 8mI(0m'  
 if(m_bControl) 0At0`Q#  
  mask|=4; @8d 3  
 if(m_bAlt) m1$tf ^  
  mask|=2; I^NDJdxd  
 if(m_bShift) !T 6R[  
  mask|=1; EVmBLH-a  
  key=Key_Table[m_Key.GetCurSel()]; 6^`iuC5  
 if(bRegistered){  X\^nV  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); [doEArwn  
  bRegistered=FALSE; zakhJ  
 } 2W AeSUX  
 cMask=mask; .-gJS-.c  
 cKey=key; D,#UJPyg  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); |]\zlH"w  
 return bRegistered; fY<#KM6X  
} AwM`[`ReE  
c-w #`  
  四、小结 <BR^Dv07U  
.. `I <2  
  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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