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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: @rP#ktz]  
  bn:74,GeyK  
  一、实现方法 V}h <,E9  
 5fq4[a  
  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: (M# m BS  
P"{yV?CNg  
#pragma data_seg("shareddata") @$fvhEkrT@  
HHOOK hHook =NULL; //钩子句柄 RF}R~m9]  
UINT nHookCount =0; //挂接的程序数目 <:>[24LJ{  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 zDf96eK  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 zI= 9  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Z&|Dp*Z  
static int KeyCount =0; Df@b;-E  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1  G){A&F  
#pragma data_seg() z2iWr  
.I Io   
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 e}NB ,o  
\E1CQP-  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: =F% <W7  
f5z*AeI  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 2)Q%lEm`SP  
cKey,UCHAR cMask) ;TKsAU  
{ R8>17w.  
 BOOL bAdded=FALSE; X`C ozyYuD  
 for(int index=0;index<MAX_KEY;index++){ ;w;+<Rd  
  if(hCallWnd[index]==0){ u p zBd]  
   hCallWnd[index]=hWnd; gI/ SA  
   HotKey[index]=cKey; I6i qC"BK  
   HotKeyMask[index]=cMask; pS "A{k)i  
   bAdded=TRUE; Ip0`R+8  
   KeyCount++; uHuL9Q^  
   break; qN'%q+n  
  } 0HI0/Tvu$<  
 } l!<(}?u9  
 return bAdded; RF [81/w]  
} [dy0aR$>d  
//删除热键 t(99m=9>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 19bqz )  
{ Jq:Wt+a  
 BOOL bRemoved=FALSE; qFp]jbU  
 for(int index=0;index<MAX_KEY;index++){  GPrq(  
  if(hCallWnd[index]==hWnd){ a+B3`6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2;7n0LOs}  
    hCallWnd[index]=NULL; =)f.Yf|A*  
    HotKey[index]=0; zG7y$\A  
    HotKeyMask[index]=0; swg*fhJFB  
    bRemoved=TRUE; G[+{[W  
    KeyCount--; F6ZL{2$k@  
    break; 7g4IAsoD  
   } ?NxaJ^  
  } Xc9NM1bp=  
 } 0?''v>%  
 return bRemoved; :cA8[!  
} Hv*+HUc(:  
;73{n*a$  
`^ )oVs  
  DLL中的钩子函数如下: _z@_.%P\  
m'eM&1Ba  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) , _bG'Hmt  
{ gMPvzBpP  
 BOOL bProcessed=FALSE; #<5i/5&  
 if(HC_ACTION==nCode) i'`>YX  
 {  eI/@ut}v  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ' Uo|@tK  
   switch(wParam) {3BWT  
   {  6n^vG/.M  
    case VK_MENU: ^@$T>SB1  
     MaskBits&=~ALTBIT; |H%,>r`9S  
     break; VO<P9g$UD  
    case VK_CONTROL: '/fueku  
     MaskBits&=~CTRLBIT; fS4 Ru  
     break; EdCcnl?R6  
    case VK_SHIFT: A<-3u  
     MaskBits&=~SHIFTBIT; A/OGF>  
     break; *X 2dS {  
    default: //judge the key and send message ={I(i6  
     break; Z#@<|{eI  
   } # "TL*p  
   for(int index=0;index<MAX_KEY;index++){ m,SWG[~  
    if(hCallWnd[index]==NULL) V7?Pv Q  
     continue; 4EJ6Zy![0*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T*#<p;  
    { npcL<$<6X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); fn.}LeeS>  
     bProcessed=TRUE; \7q>4[  
    } y<)q;fI7  
   } 8'0KHn{#  
  } )z7+%nTO  
  else if((lParam&0xc000ffff)==1){ //有键按下 /&RS+By(i  
   switch(wParam) Gx-tPW}  
   { ^%x7:  
    case VK_MENU: #.<(/D+  
     MaskBits|=ALTBIT; zg{  
     break; G=>LW1E|  
    case VK_CONTROL: r%II` i  
     MaskBits|=CTRLBIT; BoXGoFn  
     break; v H vwH  
    case VK_SHIFT: **Q K}j[D  
     MaskBits|=SHIFTBIT; \E,Fe:/g  
     break; oBzjEv  
    default: //judge the key and send message u )KtvC!  
     break; !S[7IBk%  
   } a\v@^4   
   for(int index=0;index<MAX_KEY;index++){ 9h'klaE(  
    if(hCallWnd[index]==NULL) z_en .  
     continue; lof}isOz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &^JY  
    { Z sbE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ]}jY] l  
     bProcessed=TRUE; fAV=O%^  
    } 3gY4h*|`<  
   } RLX?3u&  
  } W\<p`xHk  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 oF#]<Z\  
   for(int index=0;index<MAX_KEY;index++){ m_r_4BP  
    if(hCallWnd[index]==NULL) #:M)a?E/%  
     continue; 0:3<33]x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) hh"=|c  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (Y?" L_pC  
     //lParam的意义可看MSDN中WM_KEYDOWN部分  IQCIc@5  
   } |.[4$C  
  } 0Xw3h^%  
 } i:,37INMt  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^DS+O>  
} _J`q\N K  
cakb.Q  
  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: [vY? !  
x'wT%/hp  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); QH_I<Y:n  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jaI mO  
5x; y{qT  
  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: N>4uqFo  
1A b=1g{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) f.&Y_G3a<  
{ OA3* "d*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) &GH ,is  
 { R2$;f?;:  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 f6Io|CZWJ  
  SaveBmp(); B?)=d,E  
  return FALSE; FGG 7;0(  
 } ');QmN%J  
 …… //其它处理及默认处理 RAW(lZ(  
} FUj4y 9X  
{^VvL'n  
z`[q$H7?  
  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。 ?Em*yc@WD  
GP\Pk/E  
  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。 uM<6][^`  
7J@D})si  
  二、编程步骤 Ii9@ j1-g  
)pA N_e"  
  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"; yPqZ ,  
aj<=]=hr  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; NuqWezJm&  
uk~4R@=&H  
  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; ;/8oP ;X2  
$}G03G@  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; }{Ncww!iN  
+\a`:QET  
  5、 添加代码,编译运行程序。 Y|iJO>_Uu=  
DdL0MGwX  
三、程序代码 RjS&^u aP  
~rX2oLw{&  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 4^0L2BVcv  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) G.} 3hd0  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ er?'o1M  
#if _MSC_VER > 1000 d8? }69:h  
#pragma once 1wpeYn7>W  
#endif // _MSC_VER > 1000 duKR;5:  
#ifndef __AFXWIN_H__ YkKq}DXj  
#error include 'stdafx.h' before including this file for PCH <([1(SY2e  
#endif .iB?:  
#include "resource.h" // main symbols 'e4  ;,m  
class CHookApp : public CWinApp RqIic\aD  
{ /f7Fv*z/  
 public: `"<} B"s  
  CHookApp(); 6/Coi,om  
  // Overrides |*im$[g=-  
  // ClassWizard generated virtual function overrides e'c~;Z\A  
  //{{AFX_VIRTUAL(CHookApp) FN&.PdRT  
 public: 0 pH qNlb  
  virtual BOOL InitInstance(); /f9jLY +  
  virtual int ExitInstance(); @i9T),@  
  //}}AFX_VIRTUAL 5]&vs!wH  
  //{{AFX_MSG(CHookApp) =_`4HDr  
  // NOTE - the ClassWizard will add and remove member functions here. 0~\Dd0W/:`  
  // DO NOT EDIT what you see in these blocks of generated code ! 9@-^! DBM  
  //}}AFX_MSG P!{ O<P  
  DECLARE_MESSAGE_MAP() + (cTzY  
}; -VESe}c:nQ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); mk;l;!*T8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zhDmZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hY.zwotH  
BOOL InitHotkey(); |-hzvuSX  
BOOL UnInit(); #KonVM(`  
#endif f.`noZN  
T6|zT}cb  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. O7shY4Sr  
#include "stdafx.h" T3o}%wGW  
#include "hook.h" 'Dq!o[2y  
#include <windowsx.h> 7B$iM,}.b  
#ifdef _DEBUG  ?6!7fs,  
#define new DEBUG_NEW .pgTp X   
#undef THIS_FILE )jK"\'cK  
static char THIS_FILE[] = __FILE__; 38dXfl  
#endif fmvX;0O  
#define MAX_KEY 100  ? {Lp  
#define CTRLBIT 0x04 &Z_W*D  
#define ALTBIT 0x02 W^W^5-'"D,  
#define SHIFTBIT 0x01 +'H_sMmi{  
#pragma data_seg("shareddata") qJj;3{X2  
HHOOK hHook =NULL;  t]Xdzy  
UINT nHookCount =0; wwS{V  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ;/W;M> ^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT (63_  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey FLO#!G  
static int KeyCount =0; |Ebwl]X2  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ~O~c^fLH(B  
#pragma data_seg() WlF"[mU-  
HINSTANCE hins; M$z.S0"  
void VerifyWindow(); &j,rq?eh$  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) F7`3,SzHp  
//{{AFX_MSG_MAP(CHookApp) #;Y JR9VN  
// NOTE - the ClassWizard will add and remove mapping macros here. <JKRdIx&1  
// DO NOT EDIT what you see in these blocks of generated code! LXaT_3 ;  
//}}AFX_MSG_MAP 31LXzQvFG  
END_MESSAGE_MAP() yAoJ?<4^W  
:luVsQ  
CHookApp::CHookApp() h5&l#>8&  
{ NamBJ\2E1[  
 // TODO: add construction code here, &inu mc  
 // Place all significant initialization in InitInstance 8H3|i7.1h  
} @eN x:}  
)eNR4nF  
CHookApp theApp; maLKUSgo  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) uYlC*z{  
{ }u&.n pc  
 BOOL bProcessed=FALSE; ewqfs/  
 if(HC_ACTION==nCode) ^0 R.U+?+  
 { <8[BB7  
  if((lParam&0xc0000000)==0xc0000000){// Key up BhkJ >4#  
   switch(wParam) nZa.3/7dJ  
   { z!5^UD8"W  
    case VK_MENU: mxhO: .l  
     MaskBits&=~ALTBIT; sn&y;Vc[$  
     break; `'[u%UE  
    case VK_CONTROL: LQ"56PP<  
     MaskBits&=~CTRLBIT; *ta ``q  
     break; NIeT.!  
    case VK_SHIFT: 5 fjeBfy  
     MaskBits&=~SHIFTBIT; ja}_u}:  
     break; 4;_{*U-  
    default: //judge the key and send message 7</&=lly  
     break; etj8M y6=  
   } ;BqYhi  
   for(int index=0;index<MAX_KEY;index++){ "jzU`  
    if(hCallWnd[index]==NULL) !CROc}  
     continue; 7=t4;8|j;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aEVBU  
    { |jV>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ywpk\  
     bProcessed=TRUE; BEyg 63=  
    } L5E.`^?  
   } u-3A6Q  
  } }s=D,_}m  
  else if((lParam&0xc000ffff)==1){ //Key down Jz s.)  
   switch(wParam)  Q0' xn  
   { '<~l% q  
    case VK_MENU: j^T.7Zv  
     MaskBits|=ALTBIT; m UpLD+-j  
     break; W XDl\*n  
    case VK_CONTROL: W~+ ] 7<  
     MaskBits|=CTRLBIT; 1q<BYc+z  
     break; {wRsV=*  
    case VK_SHIFT: 2e zQX2q  
     MaskBits|=SHIFTBIT; CN@bJo2  
     break; M ()&GlNs  
    default: //judge the key and send message cj@Ygc)n  
     break; n5A0E2!  
   } 0'`>20Y  
   for(int index=0;index<MAX_KEY;index++) Iodk1Y;  
   { >6Y\CixN  
    if(hCallWnd[index]==NULL) /=A?O\B7  
     continue; `:!mPNW#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~isrE;N1|  
    { %geiJ z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); T>s~bIzL*e  
     bProcessed=TRUE; :l8n)O3  
    } D ::),,  
   } R>U0W{1NO  
  } W/9dT^1y4'  
  if(!bProcessed){ BRbx.  
   for(int index=0;index<MAX_KEY;index++){ -;cZW.<  
    if(hCallWnd[index]==NULL) C1^=se  
     continue; 7A?~a_Ep  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1GKd*z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); [!p>Id  
   } -?`^^ v  
  } = ;#?CAa:  
 } 6Y0k}+j|>E  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); SuU,SE'TX  
} n=l>d#}$%T  
J`a$"G B.  
BOOL InitHotkey() Aa-L<wZVPt  
{ 5mUHk]W  
 if(hHook!=NULL){ f4)fa yAVp  
  nHookCount++; 1X2MhV  
  return TRUE; !`L%wS  
 } 0Lmq?D  
 else .)o<'u@Ri  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); T;qP"KWZ  
  if(hHook!=NULL) /) Bk r/  
   nHookCount++; x zu)``?  
  return (hHook!=NULL); Hj't.lg+j  
} r$}M,! J  
BOOL UnInit() NrT!&>M  
{ Ecp]fUQK  
 if(nHookCount>1){ 1=gE ,k5H  
  nHookCount--; <7R\ #  
  return TRUE; A ><  
 } u8L%R[#o  
 BOOL unhooked = UnhookWindowsHookEx(hHook); P2pdXNV  
 if(unhooked==TRUE){  i1$ $86  
  nHookCount=0; G=Hvh=K(  
  hHook=NULL; OAO|HH  
 } FIhq>L.q4  
 return unhooked; t?f2*N :  
} + X(@o  
U/9xO"b{.  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 68JYA?  
{ Bee`Pp2  
 BOOL bAdded=FALSE; gKoB)n<[  
 for(int index=0;index<MAX_KEY;index++){ O4J <u-E$  
  if(hCallWnd[index]==0){ ~``oKiPg@  
   hCallWnd[index]=hWnd; >Q#h,x~vu  
   HotKey[index]=cKey; U8Z(=*Z3  
   HotKeyMask[index]=cMask; .1<QB{4~v  
   bAdded=TRUE; P}hHx<L  
   KeyCount++; LdnHz#  
   break; p&dpDJ?d:=  
  } VWf&F`^B(  
 } 9`  
 return bAdded; %^tKt  
} wb~B Y  
b>SG5EqU@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) TtTp ,If  
{ =REMSe j  
 BOOL bRemoved=FALSE; 4FUY1p  
 for(int index=0;index<MAX_KEY;index++){ l#u$w&  
  if(hCallWnd[index]==hWnd){ xa#;<8 iV  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ EYWRTh  
    hCallWnd[index]=NULL; y,'M3GGl  
    HotKey[index]=0; `L# pN5  
    HotKeyMask[index]=0; KBJ%$OQV  
    bRemoved=TRUE; $P'Y  
    KeyCount--; |8^53*f ?  
    break; art L  
   } k|V%*BvY>  
  } Nki08qZ[  
 } tN P>6F/  
 return bRemoved; ramYSX@  
} N?7MYP  
MYNNeO  
void VerifyWindow() VRden>vKN  
{ CqK&J /8  
 for(int i=0;i<MAX_KEY;i++){ Kz>bfq7  
  if(hCallWnd!=NULL){ mQ(6ahD U  
   if(!IsWindow(hCallWnd)){ ,F}\njL  
    hCallWnd=NULL; tDw(k[aK@  
    HotKey=0; } )D E  
    HotKeyMask=0; ZcJa:  
    KeyCount--; G*;?&;*  
   } wJc~AP)I%z  
  } [0vgA#6I  
 } *Rm"3S  
} 8i$quHd&x  
i/UDda"E  
BOOL CHookApp::InitInstance() J:W|2U="  
{ E%Tpby}^'  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 4-j3&(  
 hins=AfxGetInstanceHandle(); /`6Y-8e2  
 InitHotkey(); u NmbR8Mx  
 return CWinApp::InitInstance(); Ub[SUeBGH  
} 7\(m n$  
:c75*h`  
int CHookApp::ExitInstance() rdj_3Utv  
{ c,@&Z#IZ`  
 VerifyWindow(); |w; hu]  
 UnInit(); {"kE u  
 return CWinApp::ExitInstance(); Y=G9|7*lO  
} .M(')$\U  
b$@vJ7V!  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file DA=#T2)p  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) |!t &ZpdD  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ >qE f991SZ  
#if _MSC_VER > 1000 au=A+  
#pragma once P"-*'q,9  
#endif // _MSC_VER > 1000 {L6@d1u  
b0VEMu81k  
class CCaptureDlg : public CDialog Q[PVkZ  
{ 8Dy5g  
 // Construction B'NtG84  
 public: -9PJ4"H  
  BOOL bTray; K Eda6zZH  
  BOOL bRegistered; I:|<};m m  
  BOOL RegisterHotkey(); f%,Vplb  
  UCHAR cKey; %<dvdIB  
  UCHAR cMask; TEJn;D<1I,  
  void DeleteIcon(); 2uSXC*Phz  
  void AddIcon(); 5r2A^<)  
  UINT nCount; mYUR(*[  
  void SaveBmp(); 1s-dqHz"s  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor DUrfC[jpv  
  // Dialog Data ?.{SYaS  
  //{{AFX_DATA(CCaptureDlg) 90"&KDh  
  enum { IDD = IDD_CAPTURE_DIALOG }; |.#G G7F^S  
  CComboBox m_Key; nj1TX  
  BOOL m_bControl; I8x,8}o>V  
  BOOL m_bAlt; w]@H]>sHd  
  BOOL m_bShift; (r6'q0[  
  CString m_Path; Aj{c s  
  CString m_Number; ()}(3>O-  
  //}}AFX_DATA '@0Z#A  
  // ClassWizard generated virtual function overrides #}xw *)3  
  //{{AFX_VIRTUAL(CCaptureDlg) xF8U )j !  
 public: ]3D>ai?  
  virtual BOOL PreTranslateMessage(MSG* pMsg); a^vTBJXo  
 protected: iY,Ffu E  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ZA1:Y{ V  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ']bw37_U,  
  //}}AFX_VIRTUAL ! V^wq]D2  
  // Implementation 4 EE7gkM5  
 protected: :  I q  
  HICON m_hIcon; A4~- {.w=  
  // Generated message map functions |l-~,eRvi5  
  //{{AFX_MSG(CCaptureDlg) 8(zE^W,[8"  
  virtual BOOL OnInitDialog(); zi^?9n),  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !-veL1r  
  afx_msg void OnPaint(); @D[tljc^  
  afx_msg HCURSOR OnQueryDragIcon(); v:F_! Q  
  virtual void OnCancel(); AAXlBY6Y-  
  afx_msg void OnAbout(); fzdWM:g  
  afx_msg void OnBrowse(); =?3b3PZn  
  afx_msg void OnChange(); mOC<a7#  
 //}}AFX_MSG ROhhd.  
 DECLARE_MESSAGE_MAP() +^<s'  
}; H:#sf][&,L  
#endif !kxJ&VmeF  
XN^l*Q?3n  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file \Ota~A  
#include "stdafx.h" sRI0;  
#include "Capture.h" ^7Rc\   
#include "CaptureDlg.h" 3<x1s2U  
#include <windowsx.h> $2E&~W %  
#pragma comment(lib,"hook.lib") 41v#|%\w  
#ifdef _DEBUG 1j*E/L  
#define new DEBUG_NEW n \i ~H  
#undef THIS_FILE pi|=3W  
static char THIS_FILE[] = __FILE__; ^`S.Mw.  
#endif f6,?Yex8B  
#define IDM_SHELL WM_USER+1 29HyeLB@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F~$ay@g  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [.Rdq]w6  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; yU"lJ>Eh}}  
class CAboutDlg : public CDialog uXouN$&  
{ ge4QaK  
 public: \ z3>kvk  
  CAboutDlg(); $'x#rW>v  
  // Dialog Data HfPu~P  
  //{{AFX_DATA(CAboutDlg) ^]NFr*'!  
  enum { IDD = IDD_ABOUTBOX }; Bwc_N.w?3  
  //}}AFX_DATA _Rb>py  
  // ClassWizard generated virtual function overrides Xqy9D ZIn  
  //{{AFX_VIRTUAL(CAboutDlg) ,hOi5,|?L  
 protected: ElA(1o|9I  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9vckQCLM  
  //}}AFX_VIRTUAL g)1`A 24  
  // Implementation 5{xK&[wR*  
 protected: #9glGPR(  
  //{{AFX_MSG(CAboutDlg) +-!2nk`"a  
  //}}AFX_MSG l*w*e.ezQ  
  DECLARE_MESSAGE_MAP() hLr\;Swyp  
}; kQ`p\}7_  
:Vy*MPS5  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) m%cwhH_B  
{ FL {$9o\@  
 //{{AFX_DATA_INIT(CAboutDlg) x#XxD<y  
 //}}AFX_DATA_INIT G ?Hx"3:?  
} 5uX-onP\[  
\ZtKaEXnx  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) af'gk&%  
{ w|1O-k`  
 CDialog::DoDataExchange(pDX); Mi} .  
 //{{AFX_DATA_MAP(CAboutDlg) ]1 jhy2j  
 //}}AFX_DATA_MAP \4KV9wm  
} aH_0EBRc  
+i~kqiy.  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) qg2Vmj<H  
 //{{AFX_MSG_MAP(CAboutDlg) {kghZur  
 // No message handlers Vb)NWXmyu  
 //}}AFX_MSG_MAP aL&nD1f=!-  
END_MESSAGE_MAP() ,1B` Ve  
jp7cPpk:LG  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) NRT@"3,1YP  
: CDialog(CCaptureDlg::IDD, pParent) z?@N+||,.  
{ Nt|Fw$3*5{  
 //{{AFX_DATA_INIT(CCaptureDlg) }tO>&$ Z6f  
  m_bControl = FALSE; )x<BeD  
  m_bAlt = FALSE; `B~zB=}  
  m_bShift = FALSE; Ig<# {V  
  m_Path = _T("c:\\"); CK#i 6!~r  
  m_Number = _T("0 picture captured."); NX5$x/uz  
  nCount=0; .^6yCs5~`  
  bRegistered=FALSE; :'FCeS9  
  bTray=FALSE; }]Nt:_UCX  
 //}}AFX_DATA_INIT 3RF`F i  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 V KxuK0{  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); )nGH$Mu  
} KE6 XNG3  
} ,@ex  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) fDRG+/q(+  
{ F5y&"Y_  
 CDialog::DoDataExchange(pDX); 6 ZAZJn|  
 //{{AFX_DATA_MAP(CCaptureDlg) PQ{5*}$N  
  DDX_Control(pDX, IDC_KEY, m_Key); Ciy%7_~\  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); q+} \ (|  
  DDX_Check(pDX, IDC_ALT, m_bAlt); =!G{+&j  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); \mL]xE-  
  DDX_Text(pDX, IDC_PATH, m_Path); <Uc  
  DDX_Text(pDX, IDC_NUMBER, m_Number); k=cDPu -  
 //}}AFX_DATA_MAP DYoGtks(  
} dQz#&&s-  
[FZq'E"87  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) TPs ]n7]:  
//{{AFX_MSG_MAP(CCaptureDlg) .Q^V,[on1T  
 ON_WM_SYSCOMMAND() fRT4>So   
 ON_WM_PAINT() mL-6+pJ@  
 ON_WM_QUERYDRAGICON() oQ A,57B  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) dUUg}/  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ' &3,qT  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ia (&$a8X  
//}}AFX_MSG_MAP ROXa/  
END_MESSAGE_MAP() ~uV(/?o%  
1IlOU|4  
BOOL CCaptureDlg::OnInitDialog() PuhvJHT  
{ o7 0] F  
 CDialog::OnInitDialog(); * F_KOf9p  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); "jLC!h^N  
 ASSERT(IDM_ABOUTBOX < 0xF000); da i+"  
 CMenu* pSysMenu = GetSystemMenu(FALSE); kZ PL$ \/A  
 if (pSysMenu != NULL) CvR-lKV<  
 { %@:6&  
  CString strAboutMenu; =\ k:]  
  strAboutMenu.LoadString(IDS_ABOUTBOX); [$F*R@,&  
  if (!strAboutMenu.IsEmpty()) a`[9<AM1#  
  { h?H|)a<^9  
   pSysMenu->AppendMenu(MF_SEPARATOR); 1rS8+!9C  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 0":k[y  
  } [RF]lM]w  
 } |?]doBm|  
 SetIcon(m_hIcon, TRUE); // Set big icon VkO*+"cGv  
 SetIcon(m_hIcon, FALSE); // Set small icon Abi(1nXdQ  
 m_Key.SetCurSel(0); Yep~C %/}  
 RegisterHotkey(); jSSEfy>^  
 CMenu* pMenu=GetSystemMenu(FALSE); 'F#dv[N  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); V/:2xT  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); EqGpo_  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Sfa=AV7K  
 return TRUE; // return TRUE unless you set the focus to a control 1*|/N}g)  
} +,]VXH<y  
!!ma]pB,  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) *H i}FI  
{  Bnk '  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 6^!fuIZ;_  
 { C,A/29R,s  
  CAboutDlg dlgAbout; 4UUbX  
  dlgAbout.DoModal(); #a2gRg  
 } ($>m]|  
 else ->X>h_k.Y  
 { hu1ZckIw?  
  CDialog::OnSysCommand(nID, lParam); rL&Mq}7QK  
 } ?D6|~k i  
} ^ g|VZN  
~@)s)K  
void CCaptureDlg::OnPaint() /[D_9  
{ ? |#dGk g  
 if (IsIconic()) *G7cF  
 { P -nhG  
  CPaintDC dc(this); // device context for painting 0\vG <  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); QxN1N^a0  
  // Center icon in client rectangle qE|syA9  
  int cxIcon = GetSystemMetrics(SM_CXICON); .ANR|G  
  int cyIcon = GetSystemMetrics(SM_CYICON); hSR+7qN<e  
  CRect rect; c/ih%xR  
  GetClientRect(&rect); h5pfmN\-5  
  int x = (rect.Width() - cxIcon + 1) / 2; sei2\l8q  
  int y = (rect.Height() - cyIcon + 1) / 2; dGi HO  
  // Draw the icon 5&h">_j  
  dc.DrawIcon(x, y, m_hIcon); N>,`TsUwW  
 } "DA%vdu  
 else _Gf-s51s  
 { M0~%[nX  
  CDialog::OnPaint(); !_QT{H  
 } 7 7y+ik  
} #r]Z2Y]  
dq`{fqGl  
HCURSOR CCaptureDlg::OnQueryDragIcon() z#ki# o  
{ AS@(]T#R  
 return (HCURSOR) m_hIcon; RRB=JP{r  
} SOOJqC  
-*MY7t3  
void CCaptureDlg::OnCancel() jU7[z$GX  
{ * Ogf6  
 if(bTray) xY#J((-iH  
  DeleteIcon(); 6_])(F3+w.  
  CDialog::OnCancel(); y(MB _B7j  
} N%xCyZ  
(tOhuSW  
void CCaptureDlg::OnAbout() G_J}^B*?%v  
{ F]PsS(  
 CAboutDlg dlg; ooUVVp  
 dlg.DoModal(); Su"Z3gm5Kw  
} 9Dgs A`{$  
"C\yM{JZ  
void CCaptureDlg::OnBrowse() FRZ]E)9Z]b  
{ {_\cd.AuT  
 CString str; ruvfp_:  
 BROWSEINFO bi; R-9o 3TPa  
 char name[MAX_PATH]; m7g*zu2#  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); GT)7VFrL  
 bi.hwndOwner=GetSafeHwnd(); N`,\1hHMT  
 bi.pszDisplayName=name; ;Tp9)UP)  
 bi.lpszTitle="Select folder"; `6J7c;:  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; (lVMy\  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Z|$DchC  
 if(idl==NULL) $x+7.%1m)~  
  return; 7xv9v1['  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ;'8Wl  
 str.ReleaseBuffer(); N+B!AK0.  
 m_Path=str; qar{*>LCG  
 if(str.GetAt(str.GetLength()-1)!='\\') Vjv6d&Q  
  m_Path+="\\"; ?o?$HK   
 UpdateData(FALSE); D@gC(&U/6  
} ~M-L+XZl(  
cI@qt>&  
void CCaptureDlg::SaveBmp() 2m:K %Em6u  
{ *oz#YGNm  
 CDC dc; 2#R$-* ;#  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); a-Y6ghs  
 CBitmap bm; un_NBv}  
 int Width=GetSystemMetrics(SM_CXSCREEN); ]!"w?-h Si  
 int Height=GetSystemMetrics(SM_CYSCREEN); EI6kBRMo  
 bm.CreateCompatibleBitmap(&dc,Width,Height); su%-b\8K  
 CDC tdc; GI/NouaNfm  
 tdc.CreateCompatibleDC(&dc); ,++HiYOG}e  
 CBitmap*pOld=tdc.SelectObject(&bm); 8R!-,I"$  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 0VtjVz*C7&  
 tdc.SelectObject(pOld); Q|h$D~  
 BITMAP btm; Cm)TFh6  
 bm.GetBitmap(&btm); n19A>,m  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; GHd1?$  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ^ExuIe  
 BITMAPINFOHEADER bih; hE5?G;  
 bih.biBitCount=btm.bmBitsPixel; } SW p~3P  
 bih.biClrImportant=0; 5~?6]=hl  
 bih.biClrUsed=0; $j\>T@  
 bih.biCompression=0; QrK%DN  
 bih.biHeight=btm.bmHeight; UtTlJb{-j  
 bih.biPlanes=1; CU\gx*=E  
 bih.biSize=sizeof(BITMAPINFOHEADER); {%u^O/M  
 bih.biSizeImage=size; j67ppt  
 bih.biWidth=btm.bmWidth; ah,f~.X_|  
 bih.biXPelsPerMeter=0; ' Xj^cX  
 bih.biYPelsPerMeter=0; d=qVIpZ  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); PHqg~q;*  
 static int filecount=0; J.R\h!  
 CString name; m\XsU?SuX  
 name.Format("pict%04d.bmp",filecount++); ygIn6.p  
 name=m_Path+name; .ZF%$H  
 BITMAPFILEHEADER bfh; \{:A&X~\!  
 bfh.bfReserved1=bfh.bfReserved2=0; jDb\4QyC  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 7WS$fUBi  
 bfh.bfSize=54+size; (KyOo,a  
 bfh.bfOffBits=54; re[5lFQ~Z  
 CFile bf; wrgB =o  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ }k-8PG =  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ^rO"U[To  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); C{85#`z`  
  bf.WriteHuge(lpData,size); 8Lx/ZGy  
  bf.Close(); (FApkvy  
  nCount++; B._YT   
 } r/'!#7dLG-  
 GlobalFreePtr(lpData); |{kbc0*  
 if(nCount==1) lr~ |=}^  
  m_Number.Format("%d picture captured.",nCount); "/e)v{  
 else 4x[_lsj   
  m_Number.Format("%d pictures captured.",nCount); rIcgf1v70  
  UpdateData(FALSE); yjL+1_"B  
} #z.n?d2Gd  
Dh2Cj-| ~  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) U52 V1b  
{ z~vcwiYAP  
 if(pMsg -> message == WM_KEYDOWN) GWuKDq  
 {  FNH)wk  
  if(pMsg -> wParam == VK_ESCAPE) nL=+`aq_  
   return TRUE; Yft [)id  
  if(pMsg -> wParam == VK_RETURN) +S0aA Wal  
   return TRUE; yPtE5"(o  
 } uM1$3<  
 return CDialog::PreTranslateMessage(pMsg); #W)m({}  
} ?g4Rk9<!i  
V/2NIh  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) bpZA% {GS  
{ uPl}NEwU|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ f^1J_}cL  
  SaveBmp(); &Ril[siw  
  return FALSE; bl a`B=r  
} w6!97x  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ AH&RabH2  
 CMenu pop; uthW AT &  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); AE~a=e\x  
 CMenu*pMenu=pop.GetSubMenu(0); qA!p7"m|  
 pMenu->SetDefaultItem(ID_EXITICON); OJa(Gds  
 CPoint pt; 4RVqfD  
 GetCursorPos(&pt); jdJTOT  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); S:j{R^$k  
 if(id==ID_EXITICON) %P s.r{%{  
  DeleteIcon(); C @<T(`o  
 else if(id==ID_EXIT) r'{N_|:vv  
  OnCancel(); v; i4ZSV^A  
 return FALSE; lM4Z7mT /  
} )1#/@cU  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Xrb7.Y0d  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) b-VtQ%Q  
 AddIcon(); 7 nnF!9JOv  
 return res; *:xOenI  
} Vu.=,G  
\OkZ\!<hg  
void CCaptureDlg::AddIcon() |E?r+]  
{ E&kv4,  
 NOTIFYICONDATA data; Y|r7gy9%  
 data.cbSize=sizeof(NOTIFYICONDATA); @!dIa1Q"  
 CString tip; * rlV E  
 tip.LoadString(IDS_ICONTIP); =9ff9 83  
 data.hIcon=GetIcon(0); 8k-]u3  
 data.hWnd=GetSafeHwnd(); I?PqWG!O  
 strcpy(data.szTip,tip); EB!ne)X  
 data.uCallbackMessage=IDM_SHELL; nX3?7"v  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ;  4t(/F`  
 data.uID=98; hH5~T5?\  
 Shell_NotifyIcon(NIM_ADD,&data); f}2}Ta  
 ShowWindow(SW_HIDE); Z C01MDIY  
 bTray=TRUE; hJxL|5Uo  
} Mw RLv,&"  
*h0D,O"0  
void CCaptureDlg::DeleteIcon() RN-gZ{AW  
{ 1i$VX|r  
 NOTIFYICONDATA data; 7\%JJw6h  
 data.cbSize=sizeof(NOTIFYICONDATA); 1Mp-)-e  
 data.hWnd=GetSafeHwnd(); qA)YYg/G  
 data.uID=98; +U<YM94?  
 Shell_NotifyIcon(NIM_DELETE,&data); ~|S0E:*.  
 ShowWindow(SW_SHOW); ~) _Nh  
 SetForegroundWindow(); lj}3TbM  
 ShowWindow(SW_SHOWNORMAL); b/a\{  
 bTray=FALSE; /lUfxc4  
} Ph""[0n%o  
O>pX(DS L  
void CCaptureDlg::OnChange() 4@fv%LOQo  
{ .%n_{ab1  
 RegisterHotkey();  ,==_u  
} v}u]tl$,  
=>5Lp  
BOOL CCaptureDlg::RegisterHotkey() BM?!?  
{ d*{Cv2A.  
 UpdateData(); <!RkkU& 6  
 UCHAR mask=0; 34!.5^T  
 UCHAR key=0; KX9IC 5pR  
 if(m_bControl) 7mYcO3{5{  
  mask|=4; {p1`[R&n#  
 if(m_bAlt) %dPk,Ylz  
  mask|=2; &J2 UAmB  
 if(m_bShift) s9sl*1n1m`  
  mask|=1; nu+K N,3R"  
  key=Key_Table[m_Key.GetCurSel()]; %]I#]jR  
 if(bRegistered){  4 Pc-A  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); wJ2cAX;"  
  bRegistered=FALSE; nE8z1hBUq  
 } 6vbKKn`ST  
 cMask=mask; 1ygEyC[1  
 cKey=key; 8%B_nVc  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 9R8q+2  
 return bRegistered; 0,RYO :`  
} 5@>hjXi"Y  
<rgK}&q  
  四、小结 p*lP9[7  
\u`P(fI!K%  
  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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