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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: "+{>"_KV  
  qZwqnH  
  一、实现方法 ,g~Iup  
Kwmtt  
  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: F39H@%R  
921m'WE  
#pragma data_seg("shareddata") M}Obvl  
HHOOK hHook =NULL; //钩子句柄 )&F]j  
UINT nHookCount =0; //挂接的程序数目 5 >c,#*  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 W3M1> (  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 5B)z}g^h  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey a@ v}j&  
static int KeyCount =0; O>tz;RU  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ,"xr^@W  
#pragma data_seg() V\6V&_  
,l )7]p*X  
  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。 CEXD0+\q  
ar[I| Q_  
  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: =g3o@WD/G  
Z.$)#vM5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR BufXnMh.  
cKey,UCHAR cMask) kwAL] kI  
{ QMQ\y8E  
 BOOL bAdded=FALSE; wOLA8UYW  
 for(int index=0;index<MAX_KEY;index++){ ^NB\[ &  
  if(hCallWnd[index]==0){ 9,J^tN@^  
   hCallWnd[index]=hWnd; 0 YA  
   HotKey[index]=cKey; Po*G/RKu4W  
   HotKeyMask[index]=cMask; _@L{]6P%V  
   bAdded=TRUE; $O[$<D%H  
   KeyCount++; =6Q\78b  
   break; $s S;#r0  
  } p*5QV  
 } P ?A:0a  
 return bAdded; VoG:3qN  
} 69iY)Ob/  
//删除热键 cME|Lg(J$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) y{k65dk-  
{ 6cVJu%<V  
 BOOL bRemoved=FALSE; jV 98 2Y  
 for(int index=0;index<MAX_KEY;index++){ [~Vj(H=KwI  
  if(hCallWnd[index]==hWnd){ [yn\O=%5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \NF5)]:  
    hCallWnd[index]=NULL; ?K!^[aO}=  
    HotKey[index]=0; {W11+L{8  
    HotKeyMask[index]=0; aUYq~E tj  
    bRemoved=TRUE; ,>Yl(=&  
    KeyCount--; 4^3lG1^YY  
    break; \ 3XG8J  
   } DOB#PI [/  
  } uN*Ynf(:-  
 } ;_iDiLC;  
 return bRemoved; $_Kcm"oj  
} Yj{-|2YzL  
E'iN==p_:  
m/bP`-/,  
  DLL中的钩子函数如下: EN-;@P9;C  
H/''lI{k)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) k/,7FDO?m  
{ h6;vOd~%  
 BOOL bProcessed=FALSE; l#|wF$J  
 if(HC_ACTION==nCode) u.rFZu?E\  
 { pybE0]   
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 6 6C_XT  
   switch(wParam) &G$K. q  
   {  Wo2W/{  
    case VK_MENU: DcRvZH  
     MaskBits&=~ALTBIT; E5QQI9ea  
     break; ZGsI\3S  
    case VK_CONTROL: y"T(Unvc  
     MaskBits&=~CTRLBIT; KJYcP72P  
     break; H aA2y  
    case VK_SHIFT: t$EL3U/(  
     MaskBits&=~SHIFTBIT; +aZcA#%  
     break; T?k!%5,Kj  
    default: //judge the key and send message ,JqCxb9  
     break; &[W53Lqa  
   } E@/* eJ  
   for(int index=0;index<MAX_KEY;index++){ qq '%9  
    if(hCallWnd[index]==NULL) 8s9ZY4_  
     continue; 'B9q&k%<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) nw,XA0M3  
    { P<C=9@`!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1a79]-j  
     bProcessed=TRUE; Y{I,ipU.  
    } 1)t*l;.  
   } B*OBXN>'P  
  } wO&+Bb\=  
  else if((lParam&0xc000ffff)==1){ //有键按下 F S!D  
   switch(wParam) *nx$r[Mqj  
   { V{C{y5  
    case VK_MENU: 5*\]F}  
     MaskBits|=ALTBIT; t|?eNKVV9'  
     break; V: n\skM  
    case VK_CONTROL: d=eIsP'h  
     MaskBits|=CTRLBIT; :x3"Cj  
     break; ^ ^T xx  
    case VK_SHIFT: [9d4 0>e  
     MaskBits|=SHIFTBIT; `Rx\wfr}  
     break; %V|n2/O Y  
    default: //judge the key and send message /2>.*H_2  
     break; NnRX0]  
   } ~s2la~gu  
   for(int index=0;index<MAX_KEY;index++){ &cZl2ynPi  
    if(hCallWnd[index]==NULL) S1a6uE  
     continue; SsCV}[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?+G / 5,e  
    { @iBaJ"*,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2*5pjd{Kt  
     bProcessed=TRUE; o@[oI\Vr!  
    } vw6DHN)k  
   } \rM5@ Vf  
  } ows 3%  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 +} x\|O  
   for(int index=0;index<MAX_KEY;index++){ O39f  
    if(hCallWnd[index]==NULL) |ngv{g  
     continue; {F ',e~}s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #CRd@k ?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); s<{) X$  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 V/]o':  
   } &3f^]n!@  
  } .&2~g A  
 } $1Qcz,4B|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); yY_#fJj  
} zuS4N?t`p  
uc Ph*M  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: B &e'n<  
*~kHH  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |f3 :9(p  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O,Ej m<nt  
s"~3.J  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: O+"a 0:GM  
3(`P x}  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) rGlnu.mK^  
{ n;LjKE  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) a FL; E  
 { a5?Yh<cJ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 a= (vS  
  SaveBmp(); \Vx_$E  
  return FALSE; 1ZY~qP+n+  
 } wwE3N[  
 …… //其它处理及默认处理 ?N=`}}Ky-  
} ;r} yeI Sf  
R(f6uO!m  
@?*; -]#)  
  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。 ^$s&bH'8  
y I}>  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 kD}vK+  
RT<HiVr`  
  二、编程步骤 >%LY0(hY3  
rgF4 W8  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; )]C(NTfxg  
d:{}0hmxI  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 6&o?#l;|  
;KgDVq5  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; G7%f| Y  
~\+Bb8+hpJ  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; dOVu D(  
9V|) 3GF  
  5、 添加代码,编译运行程序。 U(2=fKK;  
o~M=o:^nH  
三、程序代码 sh*/wM  
kS4YxtvB  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 40G'3HOp  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) zEt!Pug  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ W'6sY@0m  
#if _MSC_VER > 1000 F+!9T  
#pragma once a U*}.{<!  
#endif // _MSC_VER > 1000 }/QtIY#I  
#ifndef __AFXWIN_H__ hdwF;  
#error include 'stdafx.h' before including this file for PCH Nu euCiP  
#endif TE6]4E*  
#include "resource.h" // main symbols -""(>$b 2  
class CHookApp : public CWinApp Py#TXzEcC  
{ 9Dp0Pi?29  
 public: ?JBA`,-  
  CHookApp(); M(vX.kF  
  // Overrides W;?e@}  
  // ClassWizard generated virtual function overrides PMT}fg  
  //{{AFX_VIRTUAL(CHookApp) 9"zp>VR  
 public: $b)t`r+  
  virtual BOOL InitInstance(); iK!FVKi}  
  virtual int ExitInstance(); VaA.J  
  //}}AFX_VIRTUAL 3vdFO: j  
  //{{AFX_MSG(CHookApp) 4v` G/w  
  // NOTE - the ClassWizard will add and remove member functions here. -$$mrU  
  // DO NOT EDIT what you see in these blocks of generated code ! R6TT1Ka3c  
  //}}AFX_MSG 7^syu;DT9Y  
  DECLARE_MESSAGE_MAP() W#2} EX  
}; "R"{xOQl  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); @w;$M]o1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Oh%p1$H  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); b! r%4Ah  
BOOL InitHotkey(); qkqtPbQ 7  
BOOL UnInit(); c Qe3  
#endif `g <0FQA  
frc9   
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. v3{%U1>}v  
#include "stdafx.h" z[@i=avPG  
#include "hook.h" m\70&%v  
#include <windowsx.h> F"1tPWn  
#ifdef _DEBUG N 1ydL  
#define new DEBUG_NEW gq@8Z AWn  
#undef THIS_FILE *5{1.7  
static char THIS_FILE[] = __FILE__; ~n! & ~  
#endif 11c\C Iu  
#define MAX_KEY 100 >!Xj%RW  
#define CTRLBIT 0x04 _-rC]iQJ55  
#define ALTBIT 0x02 DF UTQ:N  
#define SHIFTBIT 0x01 YRMe<upo  
#pragma data_seg("shareddata") jib pZ)  
HHOOK hHook =NULL; &xZSM,  
UINT nHookCount =0; )+ 'r-AF*  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 7 IJn9b  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT +d7 Arg!m  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey aKE`nA0\B  
static int KeyCount =0; ,U)&ny  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 8nWPt!U:  
#pragma data_seg() H>},{ z  
HINSTANCE hins; !a25cm5ys  
void VerifyWindow(); \XwC|[%P  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) !2>@:CKX  
//{{AFX_MSG_MAP(CHookApp) B&_Z&H=  
// NOTE - the ClassWizard will add and remove mapping macros here. I0qJr2[X~  
// DO NOT EDIT what you see in these blocks of generated code! I1rB,%p  
//}}AFX_MSG_MAP ;&'ryYrex  
END_MESSAGE_MAP() .FV^hrJxI;  
4LW~  
CHookApp::CHookApp() 9tb-;|  
{ KuW>^mF(I  
 // TODO: add construction code here, )FPn_p#3]  
 // Place all significant initialization in InitInstance q`?M+c*F  
} #eX<=H]  
G"tlJ7$myQ  
CHookApp theApp; V.6pfL  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8I Ip,#%v  
{ OCq5}%yU&i  
 BOOL bProcessed=FALSE; NC Y2^  
 if(HC_ACTION==nCode) hn\d{HP  
 { h-RhmQA=Iz  
  if((lParam&0xc0000000)==0xc0000000){// Key up Sk)lT^by  
   switch(wParam) (&v,3>3]  
   { }!?RB v'W  
    case VK_MENU: Gs,e8ri!  
     MaskBits&=~ALTBIT; "R=~-, ~  
     break; |,~ )/o_R  
    case VK_CONTROL: z' Z[mrLq  
     MaskBits&=~CTRLBIT; z"mpw mv5  
     break; Go^TTL   
    case VK_SHIFT: >< >%;HZ  
     MaskBits&=~SHIFTBIT; \q3ui}-9  
     break; s~bi#U;dF  
    default: //judge the key and send message ~I9o *cq  
     break; p&5>j\uJ1&  
   } y/kB`Z(Yj  
   for(int index=0;index<MAX_KEY;index++){ 0igB pHS  
    if(hCallWnd[index]==NULL) q VI0?B x  
     continue; =9W\;xE S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }/h&`0z `  
    { t72rCq QC  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); KU*aJl_n,  
     bProcessed=TRUE; k<M Q  
    } 7S^G]g!x  
   } ^\kH^   
  } SH#*Lc   
  else if((lParam&0xc000ffff)==1){ //Key down -(>Ch>O  
   switch(wParam) FvYciU!  
   { a s('ZD.9  
    case VK_MENU: L &hw- .Q  
     MaskBits|=ALTBIT; >fth iA  
     break; )B)f`(SA"<  
    case VK_CONTROL: t1"#L_<e  
     MaskBits|=CTRLBIT; hvQXYo>TZx  
     break; M_-L#FHX  
    case VK_SHIFT: ipl,{  
     MaskBits|=SHIFTBIT; &:IcwD&  
     break; E/*&'Osq  
    default: //judge the key and send message cIG7 Q"4  
     break; k<CbI V  
   } mF|KjX~s  
   for(int index=0;index<MAX_KEY;index++) ^6R(K'E}  
   { U*E)y7MY  
    if(hCallWnd[index]==NULL) \G7F/$g  
     continue; =6O*AJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @6UZC-M0  
    { >T c\~l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); s;=C&N5g  
     bProcessed=TRUE; -u4")V>  
    } +4 Pes  
   } R dwt4A+  
  } ^jUw4Dj~-q  
  if(!bProcessed){ PgGUs4[  
   for(int index=0;index<MAX_KEY;index++){ -zn_d]NV  
    if(hCallWnd[index]==NULL) 5V\",PA W  
     continue; >C!^%e;m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {j;` wN  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |2@*?o"ll  
   } ; :q  
  } tq3Rc}  
 } %>_6&A{K,d  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @\XeRx;  
} Ie(.T2K  
_MLf58  
BOOL InitHotkey() %D8.uGsh  
{ 3+s$K(%I  
 if(hHook!=NULL){ W]7/ e  
  nHookCount++; .-/IV^lGv  
  return TRUE; c.b| RM0;  
 } **kix  
 else YURMXbj  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ,7c Rd}1Y  
  if(hHook!=NULL) .RJMtmp  
   nHookCount++; X-kOp9/.  
  return (hHook!=NULL); +egwZ$5I  
} h~](9e s  
BOOL UnInit() Rz|@BxB>n  
{ )RvX}y-  
 if(nHookCount>1){ g#^MO]pY  
  nHookCount--; m 8b,_1  
  return TRUE; !khEep}  
 } s</qT6@  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 6 h,!;`8O  
 if(unhooked==TRUE){ M<n'ZDK `W  
  nHookCount=0; {srxc4R`  
  hHook=NULL; `&7tADFB  
 } D9A%8o  
 return unhooked; jVQ89vf ~  
} f$:SacF  
X~c?C-fV  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %Q0R] Hg  
{ L YF|  
 BOOL bAdded=FALSE; P/|1,S k  
 for(int index=0;index<MAX_KEY;index++){ <Nqbp  
  if(hCallWnd[index]==0){ fz:(mZ%  
   hCallWnd[index]=hWnd; \#t)B J2  
   HotKey[index]=cKey; c>{QTI:]  
   HotKeyMask[index]=cMask; M3O !jN~  
   bAdded=TRUE; 2M'dT Xz  
   KeyCount++; $*iovam>^]  
   break; ]VLseF  
  } 3oMHy5  
 } ZIc.MNq  
 return bAdded; HOFxOBV  
} kDWEgnXK,v  
7#%Pry  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) LlO8]b!P-^  
{ @x+2b0 b  
 BOOL bRemoved=FALSE; j;Z?q%M{6  
 for(int index=0;index<MAX_KEY;index++){ T-6<qh  
  if(hCallWnd[index]==hWnd){ m 0vW<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ URrx7F98  
    hCallWnd[index]=NULL; B6k<#-HAT  
    HotKey[index]=0; 6X%g-aTs  
    HotKeyMask[index]=0; =(D"(OsQ/  
    bRemoved=TRUE; >>$`]]7  
    KeyCount--; &k%>u[Bo  
    break; /G'3!S  
   } 3U+FXK#6  
  } E KV[cq  
 } ">z3i`#C'  
 return bRemoved; tMX$8W0 c  
} :vG0 l\  
% J^x `P  
void VerifyWindow() ^zQI_ydG  
{ M\5|  
 for(int i=0;i<MAX_KEY;i++){ qE8aX*A1/  
  if(hCallWnd!=NULL){ #xw*;hW<  
   if(!IsWindow(hCallWnd)){ !h7.xl OpN  
    hCallWnd=NULL; 5HV+7zU5  
    HotKey=0; ,_RNZ sa;&  
    HotKeyMask=0; %csrNf  
    KeyCount--; -"dt3$ju  
   } e@ZM&iR  
  } m\0_1 #(  
 } /~{`!30  
} Rt+-ud{O  
U\tx{CsSz  
BOOL CHookApp::InitInstance() l9&k!kF`  
{ qrlC U4  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 9DNp  
 hins=AfxGetInstanceHandle(); SI+Uq(k  
 InitHotkey(); &~Hed_  
 return CWinApp::InitInstance(); znwKwc8,  
} Nb`qM]&  
d9M[]{  
int CHookApp::ExitInstance() ()?83Xj[c  
{ K8_v5  
 VerifyWindow(); HT.*r6Y>g  
 UnInit(); yQ N{)rv  
 return CWinApp::ExitInstance(); ^D$|$=|DH  
} \xCCJWek  
=zcvR {Dkp  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file CC`_e^~y=F  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) nJ2x;';lA  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ JUpV(p"-r  
#if _MSC_VER > 1000 \H@1VgmR;  
#pragma once c_D(%Vf5  
#endif // _MSC_VER > 1000 _b~{/[s  
@I`^\oJ  
class CCaptureDlg : public CDialog hDW!pnj1  
{ |j`73@6   
 // Construction c Rq2 re  
 public: VIP7j(#t_g  
  BOOL bTray; `Zm6e!dH-  
  BOOL bRegistered; 1^}I?PbqV  
  BOOL RegisterHotkey(); ^ U*y*l$  
  UCHAR cKey; *(?Wzanh  
  UCHAR cMask; 3uqhYT;  
  void DeleteIcon(); Ww2@!ng  
  void AddIcon(); Lz'VQO1U=  
  UINT nCount; *7jz(iX  
  void SaveBmp(); 0B]q /G(  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor +y?Ilkk;j  
  // Dialog Data Z,.Hz\y1D  
  //{{AFX_DATA(CCaptureDlg) Yg^ &4ZF  
  enum { IDD = IDD_CAPTURE_DIALOG }; Y#ZgrziYM  
  CComboBox m_Key; [7FG;}lB-  
  BOOL m_bControl; ;mG*Rad  
  BOOL m_bAlt; i.vH$  
  BOOL m_bShift; + O.-o/  
  CString m_Path; >5t%_/yeB  
  CString m_Number; 64zOEjra  
  //}}AFX_DATA 5*pzL0,Y  
  // ClassWizard generated virtual function overrides tg/UtE`V  
  //{{AFX_VIRTUAL(CCaptureDlg) TJO$r6&  
 public: %M@K(Qu  
  virtual BOOL PreTranslateMessage(MSG* pMsg); U%nkPIFm  
 protected: <h7cQ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,RV qYh(-|  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); _{Kmj,q  
  //}}AFX_VIRTUAL Cku"vVw,  
  // Implementation -)`_w^Ox  
 protected: 5QMra5Nk  
  HICON m_hIcon; %L+q:naZe  
  // Generated message map functions v _MQ]X  
  //{{AFX_MSG(CCaptureDlg) l<`>  
  virtual BOOL OnInitDialog(); (90/,@6 6l  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); _fHml   
  afx_msg void OnPaint(); lT^su'+bk  
  afx_msg HCURSOR OnQueryDragIcon(); 52e>f5m.  
  virtual void OnCancel(); <W"W13*j!  
  afx_msg void OnAbout(); O,Q.-  
  afx_msg void OnBrowse(); hJ}i+[~be  
  afx_msg void OnChange(); j<B9$8x&  
 //}}AFX_MSG vwU1}H  
 DECLARE_MESSAGE_MAP() N T`S)P*?  
}; 'u7-Qetj  
#endif gsk? !D  
bO=|utpk  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file h+FM?ct6}  
#include "stdafx.h" &0F' Ca  
#include "Capture.h" `@/)S^jBau  
#include "CaptureDlg.h" HeRi67  
#include <windowsx.h> o}OY,P  
#pragma comment(lib,"hook.lib") wGc7  
#ifdef _DEBUG cuhp4!!  
#define new DEBUG_NEW \H fAKBT  
#undef THIS_FILE %=^/^[D  
static char THIS_FILE[] = __FILE__; NBYJ'nA%;f  
#endif   Q.g/  
#define IDM_SHELL WM_USER+1 FE~D:)Xj'?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z7;V}[wie  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _QPqF{iI  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; )>iOj50n3  
class CAboutDlg : public CDialog zR"c j  
{ ZSC*{dD$E  
 public: :!%VSem  
  CAboutDlg(); HZyA\FS  
  // Dialog Data -K64J5|b7  
  //{{AFX_DATA(CAboutDlg) 2B ]q1>a!  
  enum { IDD = IDD_ABOUTBOX }; oJ74Mra  
  //}}AFX_DATA 35<A :jKS  
  // ClassWizard generated virtual function overrides r )F;8(  
  //{{AFX_VIRTUAL(CAboutDlg) h.jJAVPi  
 protected: 4l$OO;B  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support |kYlh5/c d  
  //}}AFX_VIRTUAL >HP `B2Q H  
  // Implementation b(iF0U>&  
 protected: )kpEcMlR  
  //{{AFX_MSG(CAboutDlg) j/O~8o&  
  //}}AFX_MSG i5VZ,E^E  
  DECLARE_MESSAGE_MAP() )6OD@<r{  
}; T6U/}&{O  
i9;  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) x'GB#svi  
{ !+GYu;_  
 //{{AFX_DATA_INIT(CAboutDlg) yqT!A  
 //}}AFX_DATA_INIT j / 5  
} tn]nl!_@  
)^>LnQ_u  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 7'G;ijx  
{ J2bvHxb Rd  
 CDialog::DoDataExchange(pDX); j#l=%H  
 //{{AFX_DATA_MAP(CAboutDlg) X3.zNHN5  
 //}}AFX_DATA_MAP 0a~t  
} m=dNJF  
!}(B=-  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 9`tK 9  
 //{{AFX_MSG_MAP(CAboutDlg) B~p%pT S+  
 // No message handlers !J$r|IX5  
 //}}AFX_MSG_MAP FlqGexY5  
END_MESSAGE_MAP() @!sK@&ow@%  
o?`FjZ6;x  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) J]F&4 O  
: CDialog(CCaptureDlg::IDD, pParent) m{\ & k  
{ }Q\%tZC#T  
 //{{AFX_DATA_INIT(CCaptureDlg) &N~Eu-@b  
  m_bControl = FALSE; 82r8K|L.<y  
  m_bAlt = FALSE; -$Oh.B`i  
  m_bShift = FALSE; 3_(_yEKx  
  m_Path = _T("c:\\"); .WSyL  
  m_Number = _T("0 picture captured."); qE[S>/R"  
  nCount=0; 3JnpI,By  
  bRegistered=FALSE; |cvU2JI@  
  bTray=FALSE; bJ ~H  
 //}}AFX_DATA_INIT DB'v7 Ij0  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 st-{xC#N#  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 8Q'Emw |  
} 3SVGx< ,2  
F-&tSU,  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) EL 5+pt  
{ ]}2)U  
 CDialog::DoDataExchange(pDX); w0Qtr>"  
 //{{AFX_DATA_MAP(CCaptureDlg) O'<V[Y} 6  
  DDX_Control(pDX, IDC_KEY, m_Key); O)'CU1vMb  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); A_xC@$1e<  
  DDX_Check(pDX, IDC_ALT, m_bAlt); #N|\7(#~u  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); OF-k7g7  
  DDX_Text(pDX, IDC_PATH, m_Path); g`Z=Y7jLH  
  DDX_Text(pDX, IDC_NUMBER, m_Number); RRL{a6(?  
 //}}AFX_DATA_MAP @!8aZB3odt  
} VY?9|};f  
c+Q'4E0 |  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ++cS^ Lo  
//{{AFX_MSG_MAP(CCaptureDlg) HW@wia  
 ON_WM_SYSCOMMAND() kf, &t   
 ON_WM_PAINT() Iy<>-e"|  
 ON_WM_QUERYDRAGICON() >jm(2P(R   
 ON_BN_CLICKED(ID_ABOUT, OnAbout) JJ: ku&Mb  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >)>f~>  
 ON_BN_CLICKED(ID_CHANGE, OnChange) gq=t7b  
//}}AFX_MSG_MAP *1|7%*!8  
END_MESSAGE_MAP() k<gH*=uXY'  
J'44j;5&  
BOOL CCaptureDlg::OnInitDialog() 56v G R(  
{ nm^HL|  
 CDialog::OnInitDialog(); iRQ!J1SGcG  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); d0El2Ct8  
 ASSERT(IDM_ABOUTBOX < 0xF000); 7'0Vb !(  
 CMenu* pSysMenu = GetSystemMenu(FALSE); &K ~k'P~m  
 if (pSysMenu != NULL) &g`&#IRz  
 { m,.Y:2?*V  
  CString strAboutMenu; +VIA@`4  
  strAboutMenu.LoadString(IDS_ABOUTBOX); $:9t(X)H  
  if (!strAboutMenu.IsEmpty()) c*bvZC^6  
  { je] DR~  
   pSysMenu->AppendMenu(MF_SEPARATOR); { bj!]j  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #<{v~sVp&  
  } MIMC(<   
 } X/5m}-6d]  
 SetIcon(m_hIcon, TRUE); // Set big icon `#""JTA"  
 SetIcon(m_hIcon, FALSE); // Set small icon i]8O?Ab>?  
 m_Key.SetCurSel(0); s68(jYC7[  
 RegisterHotkey(); dlu*s(O"  
 CMenu* pMenu=GetSystemMenu(FALSE); ?qh-#,O9B  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "{q#)N  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); #{i*9'  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); !_fDL6a-  
 return TRUE; // return TRUE unless you set the focus to a control WAu>p3   
} NxP(&M(  
&:&'70Ya  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) lC<;Q*Y  
{ ' zyw-1  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) i|:!I)(lh  
 { -|>~I#vY  
  CAboutDlg dlgAbout; G m~ ./-  
  dlgAbout.DoModal(); 5.rAxdP  
 } $dC`keQM>9  
 else Sd7jd?#9'  
 { =L W!$p  
  CDialog::OnSysCommand(nID, lParam);  N' hT  
 } lY%I("2=  
} N>mW64_H)  
.j}]J:{%  
void CCaptureDlg::OnPaint() (x=$b(I  
{ 7KC>?F  
 if (IsIconic()) HuhQ|~C+~  
 { \Y P,}_ ~  
  CPaintDC dc(this); // device context for painting b8WtNVd  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); cu!%aM,/<-  
  // Center icon in client rectangle jn(x-fj6R  
  int cxIcon = GetSystemMetrics(SM_CXICON); *`>BOl+ro  
  int cyIcon = GetSystemMetrics(SM_CYICON); gOF^?M11x  
  CRect rect; p9v:T1 ?  
  GetClientRect(&rect); 7=-Yxt  
  int x = (rect.Width() - cxIcon + 1) / 2; 8>KUx]AN  
  int y = (rect.Height() - cyIcon + 1) / 2; 1lw%RM  
  // Draw the icon t"=5MaQk-  
  dc.DrawIcon(x, y, m_hIcon); )+ .=z  
 } yRXML\Ge  
 else X%Ok ">  
 { Be6Yh~m  
  CDialog::OnPaint(); BT7{]2?&V  
 } VD=H=Ju  
} p-4$)w~6i  
mixsJ}e  
HCURSOR CCaptureDlg::OnQueryDragIcon() PTe L3L  
{ *X0>Ru[  
 return (HCURSOR) m_hIcon; |{9<%Ok4P  
} abo=v<mR  
.}IW!$ dq  
void CCaptureDlg::OnCancel() !XPjRdq  
{ W[2]$TwT  
 if(bTray) Xa[k=qFo  
  DeleteIcon(); =j.TDv'^nd  
  CDialog::OnCancel(); Af3|l  
} 3$?6rMl@y  
#U:|- a.>  
void CCaptureDlg::OnAbout() !M^O\C)  
{ Tmzbh 9  
 CAboutDlg dlg; IuwE&#  
 dlg.DoModal(); ]]j^  
} wQ33Gc  
8(1*,CJQg  
void CCaptureDlg::OnBrowse() RpJ7.  
{ U,g8:M xHK  
 CString str; *yBVZD|?H  
 BROWSEINFO bi; V}y]<  
 char name[MAX_PATH]; BA@E  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); k]m ~DVS  
 bi.hwndOwner=GetSafeHwnd(); $d<NN2  
 bi.pszDisplayName=name; :>FN|fz  
 bi.lpszTitle="Select folder"; JduO^Fit  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; u)@:V)z  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); s"jvO>[  
 if(idl==NULL) #9,8{ O"  
  return; o/Ismg-p  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); /4x\}qvU  
 str.ReleaseBuffer(); Z^kE]Ir#EV  
 m_Path=str; 6KddHyFz  
 if(str.GetAt(str.GetLength()-1)!='\\') Qs1CK;+zU  
  m_Path+="\\"; #b^6>  
 UpdateData(FALSE); {$8+n::  
} Spn[:u@  
r#zcl)rbU  
void CCaptureDlg::SaveBmp() $@PruY3[  
{ '{ <RX  
 CDC dc; aE~T!h  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 4R'CL N |t  
 CBitmap bm; Ul8HWk[6Iw  
 int Width=GetSystemMetrics(SM_CXSCREEN); 1KZigeHXI  
 int Height=GetSystemMetrics(SM_CYSCREEN); ?UsCSJ1V  
 bm.CreateCompatibleBitmap(&dc,Width,Height); z~t0l  
 CDC tdc; VeQGdyhY  
 tdc.CreateCompatibleDC(&dc); \5a.JfF  
 CBitmap*pOld=tdc.SelectObject(&bm); /EjXyrn2  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); coXg]bUKo  
 tdc.SelectObject(pOld); 2Qe&FeT  
 BITMAP btm; )U~|QdZ  
 bm.GetBitmap(&btm); %9cT#9!7  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; SH)-(+72d  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); wUaWF$~y  
 BITMAPINFOHEADER bih; #Th)^Is  
 bih.biBitCount=btm.bmBitsPixel; .i*oZ'[X  
 bih.biClrImportant=0; JC cYFtW  
 bih.biClrUsed=0; _Q+c'q Zkl  
 bih.biCompression=0; 8H7#[?F  
 bih.biHeight=btm.bmHeight; L\#YFf  
 bih.biPlanes=1; >6S7#)0T  
 bih.biSize=sizeof(BITMAPINFOHEADER); 8UU L=  
 bih.biSizeImage=size; lC($@sC%  
 bih.biWidth=btm.bmWidth; m!ZY]:)$  
 bih.biXPelsPerMeter=0; bMK X9`*o  
 bih.biYPelsPerMeter=0; qSP &Fi  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 0OO[@Ht  
 static int filecount=0; bTJ<8q  
 CString name; p8'$@:M\  
 name.Format("pict%04d.bmp",filecount++); qur2t8gnxq  
 name=m_Path+name; lie,A  
 BITMAPFILEHEADER bfh; ,zgz7  
 bfh.bfReserved1=bfh.bfReserved2=0; ,sitOy}ks  
 bfh.bfType=((WORD)('M'<< 8)|'B'); o< @![P  
 bfh.bfSize=54+size; rd7p$e=i  
 bfh.bfOffBits=54; -Cyo2wk  
 CFile bf; {py%-W  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ T\9[PX<  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); tK;xW  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,lH }Ba02F  
  bf.WriteHuge(lpData,size); O50_qu33ju  
  bf.Close(); ),yar9C  
  nCount++; dFBFXy  
 } sFM$O232  
 GlobalFreePtr(lpData); )#i@DHt=  
 if(nCount==1) >ZJ]yhbhK  
  m_Number.Format("%d picture captured.",nCount); 8&U Mmbgy  
 else 0si1:+t-[+  
  m_Number.Format("%d pictures captured.",nCount); :\[l~S  
  UpdateData(FALSE); (RFH.iX  
} %*Ex2we&  
f-18nF7{  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Q yw@ r  
{ Y#}qXXZ>]  
 if(pMsg -> message == WM_KEYDOWN) 6J>AU  
 { 4'z)J1M  
  if(pMsg -> wParam == VK_ESCAPE) V8/4:Va7 s  
   return TRUE; SMrfEmdH+  
  if(pMsg -> wParam == VK_RETURN) z% bH?1^o  
   return TRUE; 3O,nNt;L{  
 } UN'n~d @~  
 return CDialog::PreTranslateMessage(pMsg); eA7 Iv{M  
} !dT+cZsf  
P4@`C{F5m  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $z[S0Cm  
{ +(2$YJ35  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 'i%r  
  SaveBmp(); OjhX:{"59  
  return FALSE; t+a.,$U  
} ^i|R6oO_5  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){  %W~w\mT  
 CMenu pop; SV o?o|<  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); x/?ET1iGt  
 CMenu*pMenu=pop.GetSubMenu(0); 36Lkcda[  
 pMenu->SetDefaultItem(ID_EXITICON); X&WP.n)  
 CPoint pt; Z5Lmg  
 GetCursorPos(&pt); fHd[8{;P:  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); :|n[zjK/S  
 if(id==ID_EXITICON) {.2\}7.c  
  DeleteIcon();  2yJ{B   
 else if(id==ID_EXIT) 2VRGTx  
  OnCancel(); R%KF/1;/  
 return FALSE; b*Y Wd3  
} @Fc:9a@  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); US$$ADq  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) @dv8 F "v  
 AddIcon(); R ABw( b  
 return res; Tc(=J7*r&  
} b$klm6nMvm  
>OaD7  
void CCaptureDlg::AddIcon() d@ K-ZMq  
{ O2>c|=#  
 NOTIFYICONDATA data; 5TJd9:\Af  
 data.cbSize=sizeof(NOTIFYICONDATA); bY#BK_8 :  
 CString tip; Dy.i^`7\  
 tip.LoadString(IDS_ICONTIP); N" L&Z4Z  
 data.hIcon=GetIcon(0); l$&~(YE f  
 data.hWnd=GetSafeHwnd(); fk ,Vry  
 strcpy(data.szTip,tip); n725hY6}<l  
 data.uCallbackMessage=IDM_SHELL; +vy fhw4  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; FGi7KV=N  
 data.uID=98; U5kKT.M  
 Shell_NotifyIcon(NIM_ADD,&data); ['o ueOg  
 ShowWindow(SW_HIDE); 94-BcN  
 bTray=TRUE; +4-T_m/W/  
} U,P>P+\@  
> T *`Y0P  
void CCaptureDlg::DeleteIcon() @[lMh9`  
{ Bh&pZcm|  
 NOTIFYICONDATA data; dCi:@+z8  
 data.cbSize=sizeof(NOTIFYICONDATA); dJgLS^1E  
 data.hWnd=GetSafeHwnd(); ;~<To9O  
 data.uID=98; KFbB}oId  
 Shell_NotifyIcon(NIM_DELETE,&data); 3'.@aMA@  
 ShowWindow(SW_SHOW); bVUIeX'  
 SetForegroundWindow(); n/skDx TE  
 ShowWindow(SW_SHOWNORMAL); #B5,k|"/,M  
 bTray=FALSE; YTa g|If  
} ^($'l)I  
xuv W6Q;  
void CCaptureDlg::OnChange() G{!er:Vwdh  
{ 5csh8i'V  
 RegisterHotkey(); O?X[&t  
} +7b8ye  
_nqnO8^IG4  
BOOL CCaptureDlg::RegisterHotkey() ?zBu` 7j  
{ c9nR&m8(+  
 UpdateData(); 'O(=Pz  
 UCHAR mask=0; Gt.'_hf Js  
 UCHAR key=0; wNHn.  
 if(m_bControl) Fs~(>w@  
  mask|=4; ?:wb#k)Z/  
 if(m_bAlt) gQr+ ~O  
  mask|=2; g$s;;V/8e  
 if(m_bShift) ZHK>0>;  
  mask|=1; ;Xt <\^e  
  key=Key_Table[m_Key.GetCurSel()]; % [$HX'Y  
 if(bRegistered){ 7,SQz6]  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); gNEcE9y 2  
  bRegistered=FALSE; {K.H09Y  
 } F(hPF6Zx(  
 cMask=mask; %(6IaqJ[  
 cKey=key; 9;#RzelSp  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); AI2XNSV@Yl  
 return bRegistered; OPNRBMD  
} I uxf`sd  
CI{2(.n4  
  四、小结 S-Y{Vi"2  
P{9:XSa%  
  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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