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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: ?#^_yd|<  
  k=<,A'y-/  
  一、实现方法 V@Z8t8  
+'H_sMmi{  
  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: qJj;3{X2  
 t]Xdzy  
#pragma data_seg("shareddata") wwS{V  
HHOOK hHook =NULL; //钩子句柄 ;/W;M> ^  
UINT nHookCount =0; //挂接的程序数目 (63_  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 FLO#!G  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 )k0P' zGb  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey *f:^6h  
static int KeyCount =0; bmotR8d  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 &UUIiQm~  
#pragma data_seg() CUT D]:\  
"SyAOOZ  
  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。 cjU*  
c<j2wKz  
  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: DKCPi0  
\FSkI0  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR |~bl%g8xP  
cKey,UCHAR cMask) pq6}q($Rk  
{ KDW%*%!  
 BOOL bAdded=FALSE; s#ijpc>h  
 for(int index=0;index<MAX_KEY;index++){ 9cAb\5c|  
  if(hCallWnd[index]==0){ , e{kC  
   hCallWnd[index]=hWnd; c~(+#a  
   HotKey[index]=cKey; N %-Cp)  
   HotKeyMask[index]=cMask; \iAkF`OC  
   bAdded=TRUE; rLNo7i  
   KeyCount++; @<e+E"6  
   break; ] 5lp.#EB  
  } k+2~=#  
 } Z&%#,0>]  
 return bAdded; w4 <FC$  
} V?v,q'? $  
//删除热键 C`3}7qi|C  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2/qP:3)  
{ %^m6Q!  
 BOOL bRemoved=FALSE; &dZ-}. af  
 for(int index=0;index<MAX_KEY;index++){ >[=q9k  
  if(hCallWnd[index]==hWnd){ ,V!s w5_5m  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ cA1"Nek  
    hCallWnd[index]=NULL; ja}_u}:  
    HotKey[index]=0; 4;_{*U-  
    HotKeyMask[index]=0;  /E/J<  
    bRemoved=TRUE; etj8M y6=  
    KeyCount--; ;BqYhi  
    break; \X5{>nNh  
   } bort2k  
  } TmG$Cjf84  
 } -:`$8/A|  
 return bRemoved; o&1ewE(O]  
} '$W@I  
s)#FqB8  
n4+l, ~  
  DLL中的钩子函数如下: /c~z(wv  
]'=]=o~4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) u~\u8X3  
{ S1&mY'c  
 BOOL bProcessed=FALSE; dJM)~Ay-  
 if(HC_ACTION==nCode) ozF>2`K }  
 {  2&O!<C j  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 &a%|L=FY  
   switch(wParam) @Hj5ZJ 3  
   {  1+RG@Cp  
    case VK_MENU: m5SJB]a/  
     MaskBits&=~ALTBIT; 7.$0LN/a!Z  
     break; pw*<tXH!  
    case VK_CONTROL: d0~F|j\#  
     MaskBits&=~CTRLBIT; `3^ *K/K\  
     break; nVV>;e[  
    case VK_SHIFT: ^4_)a0Kcm,  
     MaskBits&=~SHIFTBIT; Iodk1Y;  
     break; >6Y\CixN  
    default: //judge the key and send message Oemi}  
     break; Z9mY*}:U~  
   } +M!f}=H  
   for(int index=0;index<MAX_KEY;index++){ q?g4**C  
    if(hCallWnd[index]==NULL) Ub*Gv(Pg  
     continue; zE5%l`@|o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9(DS"fgC  
    { $-m@cObw!.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -;cZW.<  
     bProcessed=TRUE; XtVx H4q  
    } 7A?~a_Ep  
   } 1GKd*z  
  } [!p>Id  
  else if((lParam&0xc000ffff)==1){ //有键按下 #N_C| v/  
   switch(wParam) cq+|fg~Yy  
   { LO<R<zz  
    case VK_MENU: @6 uB78U4O  
     MaskBits|=ALTBIT; xtYX}u  
     break; fEE[h uG  
    case VK_CONTROL: L5! aLv#  
     MaskBits|=CTRLBIT; R9nW5f Nf  
     break; -hw^3Af  
    case VK_SHIFT: }YWLXxb;  
     MaskBits|=SHIFTBIT; ?Z= %I$i  
     break; 7J,j  
    default: //judge the key and send message I}Uj"m`>  
     break; ED&>~~k)  
   } SYRr|Lg  
   for(int index=0;index<MAX_KEY;index++){ Ql^I$5&  
    if(hCallWnd[index]==NULL) FuiG=quY  
     continue; Hj't.lg+j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wl H6  
    { yEyx.Mh.Af  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 13wO6tS k  
     bProcessed=TRUE; [ZU6z?Pf  
    } ]3]I`e{  
   } =mxG[zDtQ  
  } XQ]noaU  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 #4iSQ$0  
   for(int index=0;index<MAX_KEY;index++){ >%5Ld`c:SD  
    if(hCallWnd[index]==NULL) awh<CmcZ  
     continue; 9HrT>{@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;X,|I)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {J;[ Hf5  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 x9q?^\x  
   } V/"UDof  
  } ^.)oQo SE  
 } F8mS5oB|^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); p;cNmMm  
} :,%~R2  
$(B|$e^:(  
  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: ^N#B( F  
\=PnC}7I  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); } M-^A{C\%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #'[4k:  
=aZgq99  
  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,fEta6  
&7_xr.c7  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) / r6^]grg  
{ #&<>|m  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) %^tKt  
 { wb~B Y  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 b>SG5EqU@  
  SaveBmp(); l =~EweuM  
  return FALSE; 5<ZE.'O  
 } &{E1w<uv  
 …… //其它处理及默认处理 koDIxj'%X  
} x6Zhw9RV  
1"tyxAo\  
Pj(Dl C7G,  
  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。 ChzKwYDY  
OQ>8Q`  
  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。 Z$ q{!aY  
`&y Qtj# '  
  二、编程步骤 BUB$k7{z  
# 4UKkd  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; & -L$B  
k|V%*BvY>  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Nki08qZ[  
=hD@hQ i  
  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; :Z)a&A9v  
r ,I';vm<`  
  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; 2$ m#)*\  
 %f3qCN  
  5、 添加代码,编译运行程序。 !YX$4_I  
Ok63 w7  
三、程序代码 qj|P0N{7  
ou8V7  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL F[am2[/<A  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) NMJX `  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ w]<V~X  
#if _MSC_VER > 1000 V$wW?+V  
#pragma once 2OT RP4U  
#endif // _MSC_VER > 1000 CVUA7eG+  
#ifndef __AFXWIN_H__ L_4c~4  
#error include 'stdafx.h' before including this file for PCH ; '6`hZ  
#endif WEy$SN+P  
#include "resource.h" // main symbols 9O(vh(C  
class CHookApp : public CWinApp 0Va+l)F  
{ ZAATV+Z  
 public: (j<FS>##  
  CHookApp(); ].ZfTrM]  
  // Overrides 3XykIj1  
  // ClassWizard generated virtual function overrides =Q+i(UGHi  
  //{{AFX_VIRTUAL(CHookApp) Hwb+@'o  
 public: 1M@OBfB8  
  virtual BOOL InitInstance(); WXq=FZ-  
  virtual int ExitInstance(); FTu6%~M/  
  //}}AFX_VIRTUAL &.W,Hh  
  //{{AFX_MSG(CHookApp) >}~\*Y\8@  
  // NOTE - the ClassWizard will add and remove member functions here. !fX&i6  
  // DO NOT EDIT what you see in these blocks of generated code ! >- S?rXO  
  //}}AFX_MSG /wAx#[c[  
  DECLARE_MESSAGE_MAP() v9*ugu[K9  
}; o,qq*}=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); c_V^~hq  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); j8Pqc]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); CG#lpAs  
BOOL InitHotkey(); <O<Kf:i&c1  
BOOL UnInit(); |h^[/  
#endif 6ij L+5  
stxei 6  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. h2S!<  
#include "stdafx.h" TA4>12C6  
#include "hook.h" 5:R$xgc  
#include <windowsx.h> jpwR\"UJ  
#ifdef _DEBUG ;*{"|l qe  
#define new DEBUG_NEW ]S  
#undef THIS_FILE gm^j8  B  
static char THIS_FILE[] = __FILE__; 8NF93tqD6  
#endif 7C;oMh5  
#define MAX_KEY 100 @ra^0  
#define CTRLBIT 0x04 srbES6  
#define ALTBIT 0x02 hZZ  
#define SHIFTBIT 0x01 R!)3{cjU@  
#pragma data_seg("shareddata") T6ihEb$C  
HHOOK hHook =NULL; ^U q%-a  
UINT nHookCount =0; mV>l`&K=  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey we("#s1=  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT {{:QtkN  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 9-/u _$  
static int KeyCount =0; s78MXS?py  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift /]1$Soo  
#pragma data_seg() ^5'pJ/BV  
HINSTANCE hins; gPE` mE  
void VerifyWindow(); uqotVil,  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) nsA}A~(E  
//{{AFX_MSG_MAP(CHookApp) jT'09r3P  
// NOTE - the ClassWizard will add and remove mapping macros here. ! V^wq]D2  
// DO NOT EDIT what you see in these blocks of generated code! 4 EE7gkM5  
//}}AFX_MSG_MAP Tv[| ^G9x  
END_MESSAGE_MAP() A4~- {.w=  
|l-~,eRvi5  
CHookApp::CHookApp() 8NZQTRdH  
{ J#'8]p3E  
 // TODO: add construction code here, vZiuElxKi  
 // Place all significant initialization in InitInstance K0aT(Rc e  
} :kMF.9U:  
W(jOD,QMB  
CHookApp theApp; ikd1KF+I  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 1a gNwFd~  
{ )5[OG7/g  
 BOOL bProcessed=FALSE; yR3pK 0Y(?  
 if(HC_ACTION==nCode) mOC<a7#  
 { oBS m>V  
  if((lParam&0xc0000000)==0xc0000000){// Key up p3,m),  
   switch(wParam) Hk8lHja+\  
   { JW},7Ox  
    case VK_MENU: ?S<`*O +  
     MaskBits&=~ALTBIT; `VrQ? s  
     break; RW`j^q,c3  
    case VK_CONTROL: FoQy@GnM5  
     MaskBits&=~CTRLBIT; d=nv61]  
     break; 9oU1IT9   
    case VK_SHIFT: ('~}$%C  
     MaskBits&=~SHIFTBIT; Yycfb  
     break; V/&JArW  
    default: //judge the key and send message ]*Cq'<h$  
     break; '" 4;;(  
   } rRvZG&k  
   for(int index=0;index<MAX_KEY;index++){ `Sx1?@8(  
    if(hCallWnd[index]==NULL) =OeLF  
     continue;  ID]E3K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vbh 5  
    { L9$`zc  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); [xdi.6 %  
     bProcessed=TRUE; |}o6N5)  
    } cx ~XG  
   } ~@\sN+VS  
  } |SfCuV#g/<  
  else if((lParam&0xc000ffff)==1){ //Key down 7_Op(C4,nC  
   switch(wParam) 4KX\'K  
   { 4aiI&,  
    case VK_MENU: w{WEYS  
     MaskBits|=ALTBIT; ,hOi5,|?L  
     break; ElA(1o|9I  
    case VK_CONTROL: $(]E$ek  
     MaskBits|=CTRLBIT; 5S*aZ1t18  
     break; 5m yQBKE  
    case VK_SHIFT: MW2{w<-]7  
     MaskBits|=SHIFTBIT; r>ag( ^J\  
     break; =[:pm)   
    default: //judge the key and send message iv ~<me0F  
     break; 7O-fc1OTv  
   } m%cwhH_B  
   for(int index=0;index<MAX_KEY;index++) FL {$9o\@  
   { | Rj"}SC  
    if(hCallWnd[index]==NULL) +a"f)4\  
     continue; O+?vQ$z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w|1O-k`  
    { Mi} .  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); n%6ba77  
     bProcessed=TRUE; 4-?zW  
    } ^kK% 8 u  
   } OH13@k  
  } ||))gI`3a  
  if(!bProcessed){ #}lWM%9Dy  
   for(int index=0;index<MAX_KEY;index++){ <Gna}ALkg  
    if(hCallWnd[index]==NULL) z22:O"UHa  
     continue; h])oo:u'/Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -%dBZW\u2  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); DB+oCE<.#  
   } bao"iv~z  
  } FeNNzV=  
 } w$Z%RF'p  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); =gB8(1g8  
} >9NC2%61S  
"&/lF[q  
BOOL InitHotkey() r=/$}l4  
{ iS< ^MD  
 if(hHook!=NULL){ "Hk7s+%  
  nHookCount++; @ qS Z=  
  return TRUE; / E!N:g<  
 } 7h.fT`  
 else {DapXx  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); q8!]x-5$6j  
  if(hHook!=NULL) `pjB^--w  
   nHookCount++; p<<dj%  
  return (hHook!=NULL); #;= sJ[m4  
} [tRb{JsUd  
BOOL UnInit() ~RH)iI  
{ PQ{5*}$N  
 if(nHookCount>1){ Ciy%7_~\  
  nHookCount--; q+} \ (|  
  return TRUE; \&l@rMD3s  
 } B3<sSe8L0  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ~e&O?X  
 if(unhooked==TRUE){ 4peRbm  
  nHookCount=0; /Pxny3  
  hHook=NULL; `2/V.REX$h  
 } yJ="dEn>i"  
 return unhooked; dQz#&&s-  
} [FZq'E"87  
TPs ]n7]:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,M~> t7+  
{ _'4S1  
 BOOL bAdded=FALSE; phQ{<wzwp  
 for(int index=0;index<MAX_KEY;index++){ s\< @v7A  
  if(hCallWnd[index]==0){ FKPR;H8>  
   hCallWnd[index]=hWnd; *I[tIO\  
   HotKey[index]=cKey; &;sW4jnt  
   HotKeyMask[index]=cMask; 4bcd=a;  
   bAdded=TRUE; !L@<?0x LW  
   KeyCount++; o7 0] F  
   break; ==BOW\  
  } yzMGZi`ut  
 } fwiP3*j+Nn  
 return bAdded; K {  FZ/  
} |+KwyHE`9  
?\)h2oi!F5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~N2=44e  
{ t .}];IJP  
 BOOL bRemoved=FALSE; ~ToU._  
 for(int index=0;index<MAX_KEY;index++){ do*aE  
  if(hCallWnd[index]==hWnd){  <k0/O  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ p I~;3T:!  
    hCallWnd[index]=NULL; G8 q<)  
    HotKey[index]=0; Uu52uR  
    HotKeyMask[index]=0; M[+#*f.T}  
    bRemoved=TRUE; Yep~C %/}  
    KeyCount--; jSSEfy>^  
    break; 'F#dv[N  
   } B*Ey&DAV  
  } Rt:^'Qi$!  
 } ];jp)P2o  
 return bRemoved; O"/Sv'|H#  
} ,p#r; O<O  
o@7U4#E  
void VerifyWindow() c%bzrYQvA;  
{ !{{gL=_@  
 for(int i=0;i<MAX_KEY;i++){ CxN xb)c &  
  if(hCallWnd!=NULL){ pp@B]We  
   if(!IsWindow(hCallWnd)){ rLE+t(x(0  
    hCallWnd=NULL; ##} 7cFX  
    HotKey=0; A2;6Vz=z  
    HotKeyMask=0; ?;H}5>^8P  
    KeyCount--; Pjn{3/*wi  
   } j@w1S[vt  
  } :`E p#[Wvo  
 } d S'J@e=#  
} nMZ)x-  
qGX#(,E9;  
BOOL CHookApp::InitInstance() +jK-k_  
{ IibYGF  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); H cyoNY  
 hins=AfxGetInstanceHandle(); [q C0YM  
 InitHotkey(); Nd+1r|e'  
 return CWinApp::InitInstance(); GKjtX?~1  
} x$bUd 9  
aL`wz !  
int CHookApp::ExitInstance() "<{|ni}  
{ ,p OGT71  
 VerifyWindow(); 3Pllxq<n  
 UnInit(); hF$qH^-c*A  
 return CWinApp::ExitInstance(); <hj2'd U  
} }r!+wp   
t=xEUOQAn  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file qTN%9!0@9  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 9(nq 4 HvI  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ cs ?WE9N  
#if _MSC_VER > 1000 k& +gkJm  
#pragma once _ziSH 3(  
#endif // _MSC_VER > 1000 .c ~z^6x  
D/~1?p  
class CCaptureDlg : public CDialog vy7/  
{ P tLWFO  
 // Construction AFm9"mQrw  
 public: \D(3~y>  
  BOOL bTray; ajtH 1Z#  
  BOOL bRegistered; zTj ie  
  BOOL RegisterHotkey(); q\x.e.@  
  UCHAR cKey; =4co$oD}  
  UCHAR cMask; |/^S%t6*  
  void DeleteIcon(); gBi3^GxjM?  
  void AddIcon(); 9Li*L&B)  
  UINT nCount; =>B"j`oR  
  void SaveBmp(); w$AR  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Eu:/U*j  
  // Dialog Data -4sKB>b  
  //{{AFX_DATA(CCaptureDlg) ux)*B}/xh  
  enum { IDD = IDD_CAPTURE_DIALOG }; M?UUT8,  
  CComboBox m_Key; 'j<u0'K@  
  BOOL m_bControl; ]X77?Zz9  
  BOOL m_bAlt; N0-J=2  
  BOOL m_bShift; N0Y4m_dm*  
  CString m_Path; y.J>}[\&x  
  CString m_Number; }8#Ed;%K  
  //}}AFX_DATA Ie!&FQe2q  
  // ClassWizard generated virtual function overrides e\ cyiW0  
  //{{AFX_VIRTUAL(CCaptureDlg) -l57!s~V  
 public: pCrm `hy(  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Vub6wb<G[  
 protected: +(92}~RK  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1(dKb  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); aEvbGo  
  //}}AFX_VIRTUAL )LIn1o_,  
  // Implementation & ]] l0B  
 protected: /\# f@Sg  
  HICON m_hIcon; c6#E gN,X  
  // Generated message map functions -` ViuDX=  
  //{{AFX_MSG(CCaptureDlg) =g! Pw]  
  virtual BOOL OnInitDialog(); {yWL|:#K  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); VOM@x%6#c  
  afx_msg void OnPaint(); k]5tU\;Yw  
  afx_msg HCURSOR OnQueryDragIcon(); $b1>,d'oz  
  virtual void OnCancel(); S-88m/"]s  
  afx_msg void OnAbout(); qbfX(`nS  
  afx_msg void OnBrowse(); q%e'WMG~n  
  afx_msg void OnChange(); H~nX! sO  
 //}}AFX_MSG uJ -$i  
 DECLARE_MESSAGE_MAP() 9N'fU),I  
}; T+&fUhSy  
#endif t_w\k_ T  
-43>?m/a  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file t#|R"Q#  
#include "stdafx.h" CvE^t#Bok  
#include "Capture.h" *c[w9(fU  
#include "CaptureDlg.h" R$hIgw+p[  
#include <windowsx.h> ~M{/cv  
#pragma comment(lib,"hook.lib") /go[}X5QR[  
#ifdef _DEBUG t^"8M6BqC;  
#define new DEBUG_NEW v$Fz^<Na  
#undef THIS_FILE T`fT[BaY  
static char THIS_FILE[] = __FILE__; #jg-q|nd  
#endif 4Ii5V c  
#define IDM_SHELL WM_USER+1 '(3 QyCD  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); P@ew' JL%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8`urkEI^r  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; >pLJ ,Z  
class CAboutDlg : public CDialog 8+}rm6Y+  
{ ||QK)$"  
 public: }bca-|N  
  CAboutDlg(); $Y_S`#c@i  
  // Dialog Data QJ;dw8  
  //{{AFX_DATA(CAboutDlg) 1g{}O^ul  
  enum { IDD = IDD_ABOUTBOX }; zHZfp_I  
  //}}AFX_DATA [znN 'Fg:"  
  // ClassWizard generated virtual function overrides V<S6 a  
  //{{AFX_VIRTUAL(CAboutDlg) G&^8)S@1  
 protected: <i</pA  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ygIn6.p  
  //}}AFX_VIRTUAL .ZF%$H  
  // Implementation \{:A&X~\!  
 protected: jDb\4QyC  
  //{{AFX_MSG(CAboutDlg) 7WS$fUBi  
  //}}AFX_MSG .Ji9j[[#D  
  DECLARE_MESSAGE_MAP() h>D;QY  
}; trwQ@7  
EA>.SSs!  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #0b:5.vy  
{ X/2GTU7?  
 //{{AFX_DATA_INIT(CAboutDlg) 8Lx/ZGy  
 //}}AFX_DATA_INIT VfpT5W<  
} ydYsmTr  
?8H{AuLB  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 4h|*r !  
{ g]: [^p  
 CDialog::DoDataExchange(pDX); hQ<7k'V  
 //{{AFX_DATA_MAP(CAboutDlg) =bC'>qw}  
 //}}AFX_DATA_MAP /7#e  
} T^|k`  
%AA&n*m  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ]b%U9hmL^f  
 //{{AFX_MSG_MAP(CAboutDlg) ZN $%\,<  
 // No message handlers b`D]L/}pr  
 //}}AFX_MSG_MAP (Q=o 9o:b  
END_MESSAGE_MAP() SkmTW@v  
-`XS2  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) x;yvv3-$  
: CDialog(CCaptureDlg::IDD, pParent) &Jj|+P-lY  
{ +S0aA Wal  
 //{{AFX_DATA_INIT(CCaptureDlg) _|I8+(~)  
  m_bControl = FALSE; ["Ts7;q9[  
  m_bAlt = FALSE; {Z8GG  
  m_bShift = FALSE; UMRFTwY  
  m_Path = _T("c:\\"); lL:!d.{  
  m_Number = _T("0 picture captured."); 4E5;wH  
  nCount=0; M{G}-QK_.  
  bRegistered=FALSE; ;X<Ez5v3  
  bTray=FALSE; gjG SI'M0B  
 //}}AFX_DATA_INIT $3 -QM  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Anyy  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); {guOAT- w  
} &mVClq  
e`g+Jf`AT  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) K0j%\]\Tp  
{ G4SA u  
 CDialog::DoDataExchange(pDX); G7"(,L` 5  
 //{{AFX_DATA_MAP(CCaptureDlg) stajTN*J  
  DDX_Control(pDX, IDC_KEY, m_Key); N? Jy  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); *4%pXm;  
  DDX_Check(pDX, IDC_ALT, m_bAlt); E Ou[X'gLr  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ) dk|S\  
  DDX_Text(pDX, IDC_PATH, m_Path); 9!X3Cv|+L  
  DDX_Text(pDX, IDC_NUMBER, m_Number); uOzoE_i  
 //}}AFX_DATA_MAP bI:W4y>I=  
} 5e,u*J]  
|3e+ K.  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) l%_K$$C  
//{{AFX_MSG_MAP(CCaptureDlg) K:'^f? P  
 ON_WM_SYSCOMMAND() 85G-`T  
 ON_WM_PAINT() (+(@P*c1  
 ON_WM_QUERYDRAGICON() ?ld&}|W~  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) YT+b{   
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) a_P|KRl  
 ON_BN_CLICKED(ID_CHANGE, OnChange) W/BPf{U  
//}}AFX_MSG_MAP ;]grbqXVE  
END_MESSAGE_MAP() * rlV E  
I m I$~q'  
BOOL CCaptureDlg::OnInitDialog() q{9 \hEeb  
{ $?W2'Xm!V  
 CDialog::OnInitDialog(); [G$#jUt/O  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Rmmu#-{Y  
 ASSERT(IDM_ABOUTBOX < 0xF000); \O "`o4  
 CMenu* pSysMenu = GetSystemMenu(FALSE); kHhp;<  
 if (pSysMenu != NULL) Ny7*MZ-  
 { o 7kg.w|  
  CString strAboutMenu; #&kj>   
  strAboutMenu.LoadString(IDS_ABOUTBOX); /J-'[Mc'D[  
  if (!strAboutMenu.IsEmpty()) xkRMg2X.>9  
  { kqih`E9P7B  
   pSysMenu->AppendMenu(MF_SEPARATOR); Skci;4T(  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 1}la)lC  
  } k^;n$r"i5  
 } wO%lM  
 SetIcon(m_hIcon, TRUE); // Set big icon xSD*e 0  
 SetIcon(m_hIcon, FALSE); // Set small icon M;<!C%K>  
 m_Key.SetCurSel(0); J$yq#LBbR@  
 RegisterHotkey(); G-)e(u   
 CMenu* pMenu=GetSystemMenu(FALSE); K0( S%v|,}  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _-({MX[3k<  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ;dUKFdKH}  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); nktGO  
 return TRUE; // return TRUE unless you set the focus to a control ZAfuW^r  
} FulFEnSV  
A{q%sp:3~  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ,o n]Fts  
{ W{'hn&vU  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ^7+;XUyg  
 { fdK E1,;  
  CAboutDlg dlgAbout; +_fFRyu>  
  dlgAbout.DoModal(); #d,)Qe[  
 } }~zDcj_  
 else )/ 'WboL  
 { td7(444]  
  CDialog::OnSysCommand(nID, lParam); Vxap+<m  
 } P _fCb  
} w~v6=^  
qzNb\y9G  
void CCaptureDlg::OnPaint() Jyg1z,B <  
{ %]I#]jR  
 if (IsIconic()) &zy%_U2%  
 { AVD hgJv  
  CPaintDC dc(this); // device context for painting M^oL.'  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); xP'0a  
  // Center icon in client rectangle Ty&1R?  
  int cxIcon = GetSystemMetrics(SM_CXICON); YSGE@  
  int cyIcon = GetSystemMetrics(SM_CYICON); hQx*#:ns  
  CRect rect; +'g O%^{l  
  GetClientRect(&rect); BkB _?^Nv8  
  int x = (rect.Width() - cxIcon + 1) / 2; M}[Q2v\  
  int y = (rect.Height() - cyIcon + 1) / 2; zs]ubJC@  
  // Draw the icon >&;J/ME  
  dc.DrawIcon(x, y, m_hIcon); ]'Eg2(wy  
 } zGU MH7 M  
 else ?:9y !Q=  
 { Vv+nq_  
  CDialog::OnPaint(); 7<]&pSt=  
 } %OgK{h  
} i kfJ!f  
K_L7a>Fr  
HCURSOR CCaptureDlg::OnQueryDragIcon() -y!Dg6 A  
{ :'Gn?dv|  
 return (HCURSOR) m_hIcon; <jJ'T?,  
} 05ClPT\BCr  
`Z,WKus  
void CCaptureDlg::OnCancel() ek<B=F  
{ of*T,MUI  
 if(bTray) =JE<oVP8  
  DeleteIcon(); wicsf<]  
  CDialog::OnCancel(); #Q7:Mu+  
} L^t%p1R  
 DlCN  
void CCaptureDlg::OnAbout() Wo&22,EB  
{ LAk .f  
 CAboutDlg dlg; xwsl$Rj  
 dlg.DoModal(); ]>)shH=Yx  
} l[[`-f8j  
_Kaqx"D  
void CCaptureDlg::OnBrowse() BN]o!Y  
{ j7&#R+f  
 CString str; I-!7 EC2{!  
 BROWSEINFO bi; kIS )*_  
 char name[MAX_PATH]; _ -RqkRI  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); gWU#NRRc  
 bi.hwndOwner=GetSafeHwnd(); Td|,3 n  
 bi.pszDisplayName=name; F>{bVPh VA  
 bi.lpszTitle="Select folder"; #g$I>\O<  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; )wjpxr  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); i695P}J2  
 if(idl==NULL) Pq+|*Y<|&  
  return; d4IQ;u  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); bX38=.up  
 str.ReleaseBuffer(); C {*?  
 m_Path=str; b&`~%f-  
 if(str.GetAt(str.GetLength()-1)!='\\') >(H:eRKq  
  m_Path+="\\"; ;q-c[TZC  
 UpdateData(FALSE); '{cND  
} $,Xn@4  
ASi2;Q_{_  
void CCaptureDlg::SaveBmp() v0) %S  
{ E!}'cxb^  
 CDC dc; g0biw?  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); fsOlg9  
 CBitmap bm; PtuRXx  
 int Width=GetSystemMetrics(SM_CXSCREEN); BDfMFH[1  
 int Height=GetSystemMetrics(SM_CYSCREEN); X_X7fRC0  
 bm.CreateCompatibleBitmap(&dc,Width,Height); gHp4q!SJ7  
 CDC tdc; 3"Oipt+  
 tdc.CreateCompatibleDC(&dc); STu(I\9  
 CBitmap*pOld=tdc.SelectObject(&bm); JzywSQ  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); }*!L~B!  
 tdc.SelectObject(pOld); QyTN  V  
 BITMAP btm; PYi<iSr  
 bm.GetBitmap(&btm); ,s%+vD$O^  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; RvA "ug.*  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ph b ;D  
 BITMAPINFOHEADER bih; )OQm,5F1  
 bih.biBitCount=btm.bmBitsPixel; Oi|cTZ@A-  
 bih.biClrImportant=0; 5w>TCx  
 bih.biClrUsed=0; V$DB4YM1k  
 bih.biCompression=0; ]E"J^mflGK  
 bih.biHeight=btm.bmHeight; |+8rYIms`  
 bih.biPlanes=1; V8F! o  
 bih.biSize=sizeof(BITMAPINFOHEADER); Oq<3&*  
 bih.biSizeImage=size; !8|r$mN8  
 bih.biWidth=btm.bmWidth; 'uz o[>p  
 bih.biXPelsPerMeter=0; R $<{"b  
 bih.biYPelsPerMeter=0; !2AD/dtt   
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ;ja~Q .}4  
 static int filecount=0; oD2! [&  
 CString name; ? XVE {N  
 name.Format("pict%04d.bmp",filecount++); bh8GP]*E|  
 name=m_Path+name; ]GRVU  
 BITMAPFILEHEADER bfh; @)Vb?|3  
 bfh.bfReserved1=bfh.bfReserved2=0; .&]3wB~  
 bfh.bfType=((WORD)('M'<< 8)|'B'); x!S}Y"  
 bfh.bfSize=54+size; FiRe b3zR  
 bfh.bfOffBits=54; A1B[5a*o!  
 CFile bf; =zAFsRoD_B  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ?8grK  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ecl6>PS$'  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); M1P;x._n  
  bf.WriteHuge(lpData,size); ]Y$Wv9 S6  
  bf.Close(); nO`[C=|  
  nCount++; ^WWr8-  
 } &/' O?HWl  
 GlobalFreePtr(lpData); >9nVR  
 if(nCount==1) of7'?]w  
  m_Number.Format("%d picture captured.",nCount); &Pv$nMB$I  
 else |a[" ^ 2  
  m_Number.Format("%d pictures captured.",nCount); A-vYy1,'  
  UpdateData(FALSE); K;THYMp/[  
} aTHf+;  
W1o6Sh8v(  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) KpG'E  
{ cJm},  
 if(pMsg -> message == WM_KEYDOWN) uHf1b?W  
 { .I{u[ "  
  if(pMsg -> wParam == VK_ESCAPE) K ..Pn 17t  
   return TRUE; l8M}82_  
  if(pMsg -> wParam == VK_RETURN) 'Eia=@  
   return TRUE; DfkGNBY  
 } @CR<&^s5V  
 return CDialog::PreTranslateMessage(pMsg); QN#Lbsd  
}  ]E :L  
"6WJj3h N  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) kN<;*jHV  
{ 8=f+`e  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ MftaT5  
  SaveBmp(); ZrP 8/>  
  return FALSE; B[&l<*O-y  
} Vd.XZ*}r*  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 7Fa<m]k  
 CMenu pop; [4;_8-[Nv  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); "{S4YA  
 CMenu*pMenu=pop.GetSubMenu(0); F-~Xbz%  
 pMenu->SetDefaultItem(ID_EXITICON); k=Wt57jt  
 CPoint pt; *mn9CVZ(}M  
 GetCursorPos(&pt); XkW@"pf&Fh  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); iH>JR[A  
 if(id==ID_EXITICON) 8PeVHpZ  
  DeleteIcon(); g-x;a0MQx  
 else if(id==ID_EXIT) 8j]QnH0&  
  OnCancel(); C2iOF/4  
 return FALSE; <#Fex'4  
} jtpk5 fJB  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ept:<!4  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {9@E[bWp#  
 AddIcon(); DB jUHirK  
 return res; \Ff]}4  
} ]=|iO~WN  
`N7erM  
void CCaptureDlg::AddIcon() X2~KNw  
{ REX/:sB<  
 NOTIFYICONDATA data; z __#P Q,n  
 data.cbSize=sizeof(NOTIFYICONDATA); Uq%|v  
 CString tip; h_Er$ZT64  
 tip.LoadString(IDS_ICONTIP); >9g^-~X;v  
 data.hIcon=GetIcon(0); z&qOu8Jh  
 data.hWnd=GetSafeHwnd(); Ra~:O\Z  
 strcpy(data.szTip,tip); /3"S_KE1@+  
 data.uCallbackMessage=IDM_SHELL; &7,/^ >">  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; M-!#-l  
 data.uID=98; BNJG-b|g^  
 Shell_NotifyIcon(NIM_ADD,&data); :w4H$+j  
 ShowWindow(SW_HIDE); ,:81DA  
 bTray=TRUE; $Ixd;`l*  
} Frhm4H%,_R  
bx".<q(  
void CCaptureDlg::DeleteIcon() hg+;!|ha  
{ FFN.9[Ly  
 NOTIFYICONDATA data; k[1[Y{n.  
 data.cbSize=sizeof(NOTIFYICONDATA); s, #$o3  
 data.hWnd=GetSafeHwnd(); <dk9n}y<,  
 data.uID=98; !C.{nOfyv  
 Shell_NotifyIcon(NIM_DELETE,&data); G<*h,'B  
 ShowWindow(SW_SHOW); ,=%c e  
 SetForegroundWindow(); )pey7-P7g5  
 ShowWindow(SW_SHOWNORMAL); FQJFq6l  
 bTray=FALSE; 2NL|_W/  
} ;ov}%t>UD  
DEv,!8  
void CCaptureDlg::OnChange() _B]Bd@<w  
{ 3 }rx(  
 RegisterHotkey(); #)6 bfyi-  
} b\t@vMJ  
`Uk jr MO  
BOOL CCaptureDlg::RegisterHotkey() &)~LGWBdC  
{ xA}{ZnTbN  
 UpdateData(); i079 V  
 UCHAR mask=0; @ 6b;sv1W  
 UCHAR key=0; SYOU &*  
 if(m_bControl) 8wS9%+  
  mask|=4; Ga *  
 if(m_bAlt) LGCeYXic  
  mask|=2; |@ZyD$?  
 if(m_bShift) jm |zn  
  mask|=1; Rn whkb&&  
  key=Key_Table[m_Key.GetCurSel()]; N4 _V  
 if(bRegistered){ ~-(X\:z}  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ;Y &2G'  
  bRegistered=FALSE; C2%Yry  
 } _..5G7%#%  
 cMask=mask; l?beqw:  
 cKey=key; Cmj `WSSa  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 'ka"0~:NS{  
 return bRegistered; 9l7 youZ]  
} Q[Tbdc%1EG  
Nk>6:Ho{G  
  四、小结 &cx]7:;  
w?c~be$  
  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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