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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: )*`cJ_t  
  -+HD5Hc  
  一、实现方法 /cX%XZg  
NY3/mS3w  
  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: bH Nf>  
5OM*NT t  
#pragma data_seg("shareddata") '89nyx&W  
HHOOK hHook =NULL; //钩子句柄 Gl6M(<f\5  
UINT nHookCount =0; //挂接的程序数目 VBN=xg}  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 <hBd #J  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 dcH@$D@~S  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ^Z>Nbzr{  
static int KeyCount =0; {3qlx1w  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -}CMNh   
#pragma data_seg() cna/?V  
8#ZF<B Y  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 `gX$N1(  
nrM_ay  
  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: 9>-]*7  
w s([bS2h  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ?3yrX _Qm{  
cKey,UCHAR cMask) ^|lw~F  
{ O!k C  
 BOOL bAdded=FALSE; kKs}E| T  
 for(int index=0;index<MAX_KEY;index++){ c\.7Z=D  
  if(hCallWnd[index]==0){ :soR7oHZ  
   hCallWnd[index]=hWnd; jmJeu@(  
   HotKey[index]=cKey; #/ HQ?3h]  
   HotKeyMask[index]=cMask; /=[hRn@)A  
   bAdded=TRUE; 6R|^IPOGp  
   KeyCount++; 5_[we1$P  
   break; S7h?tR*u  
  } *cy!PF&  
 } 1a tQ9  
 return bAdded; Zq"  
} &Vy.)0  
//删除热键 ~F.kgX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) DR(/|?k+  
{ Oq[YbQ'GE  
 BOOL bRemoved=FALSE; giH WC%/  
 for(int index=0;index<MAX_KEY;index++){ zrL+:/t  
  if(hCallWnd[index]==hWnd){ q^ eLbivVE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ nC5]IYL|  
    hCallWnd[index]=NULL; > zV  
    HotKey[index]=0; ly::?  
    HotKeyMask[index]=0; 6=p!`DOd  
    bRemoved=TRUE; h'"~t#r  
    KeyCount--; ^D?{[LBc  
    break; 62 9g_P)  
   } (b"kN(  
  } =3EE-%eF!  
 } 7{Zs"d{s  
 return bRemoved; !7n`-#)  
} 6B!v;93U  
& R,QJ4L  
6$&%z Eh  
  DLL中的钩子函数如下: -u^f;4|u  
OV/ &'rC  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) H+5S )r  
{ 4O7 {a  
 BOOL bProcessed=FALSE; YM&i  
 if(HC_ACTION==nCode) [{.9#cQ "  
 { f>[{1M]n\  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 qkA8q@Y4|  
   switch(wParam) Gx;-1  
   {  9cQ;h37J>  
    case VK_MENU: '3iJq9  
     MaskBits&=~ALTBIT; 2. f8uq  
     break; W=I~GhM  
    case VK_CONTROL: Wrf+5 ;,,  
     MaskBits&=~CTRLBIT; 4l@aga  
     break; JOo+RA5d  
    case VK_SHIFT: `RyH~4\;  
     MaskBits&=~SHIFTBIT; "%ZAL\x  
     break; MogIQ  
    default: //judge the key and send message `B/74Wa3q  
     break; @}io K=A  
   } b!T-{Ns6  
   for(int index=0;index<MAX_KEY;index++){ .RpWE.C  
    if(hCallWnd[index]==NULL) w"q^8"j!  
     continue; E&;;2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hu 5o{8[  
    { ~_|CXPiQ8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); oA+'9/UY  
     bProcessed=TRUE; ut^6UdJ+`  
    } 6E$ET5p&l  
   } &sooXKlv|  
  } /hYFOZ  
  else if((lParam&0xc000ffff)==1){ //有键按下 d0YQLh  
   switch(wParam) "4L_BJZ  
   { y3ST0=>j}  
    case VK_MENU: ) ):w`^6  
     MaskBits|=ALTBIT; ({mlA`d]  
     break; 2Yg\<Ps N  
    case VK_CONTROL: Uy<n7*H  
     MaskBits|=CTRLBIT; 0RHjA& r3v  
     break; )CD-cz6n  
    case VK_SHIFT: )v %tyU  
     MaskBits|=SHIFTBIT; ^L-; S  
     break; w" Y'I$  
    default: //judge the key and send message #:=*n(GT  
     break; ok{ F=z  
   }  #]J"j]L  
   for(int index=0;index<MAX_KEY;index++){ s1J( -O  
    if(hCallWnd[index]==NULL) GHFYIor  
     continue; I\f\k>;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y'_2|5!Qs  
    { 0Vj!'=Ntv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [bjP-pX  
     bProcessed=TRUE; r85j /YK  
    } .xe+cK  
   } %:8XZf  
  } 3K%_wCZ  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 7)*QX,4C  
   for(int index=0;index<MAX_KEY;index++){ KMXd  
    if(hCallWnd[index]==NULL) mW1T4rR'  
     continue; Hlz$@[$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \J6&Z13Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); OE2r2ad  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 pE 6r7  
   } v[~Q   
  } ?I7%ueFY  
 } ,f$ftn\~j/  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); r[P+F  
} }LryRcrD-n  
vP^V3  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: R(IYb%L  
CK8!7=>}^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @O8X )  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); c\VD8 :  
tJpK/"R'  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 0W,.1J2*  
d_ji ..T  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) oG=4&SQ  
{ T&->xe f=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) S6{u(= H  
 { Dyh|F\T  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 cG5u$B  
  SaveBmp(); Mh=j^ [4Q  
  return FALSE; w\ddC DZ  
 } 0A F}wz>  
 …… //其它处理及默认处理  6Ok]E`  
} lbC9^~T+  
x<=R?4@rq  
g5t`YcL  
  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。 B>%;"OMp  
sfs2kiH  
  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。 } ^WmCX2a  
j"n"=rTTQ  
  二、编程步骤 8UXtIuQ  
"B0I$`~wu  
  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"; HJ;!'@  
n4o}}tI  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; MGsY3~!K  
m:c .dei5  
  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; +O@|bd \  
@cn8m  
  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; u6i X&%e  
G.>Ul)O:a  
  5、 添加代码,编译运行程序。 c.}#.-b8  
z7R2viR[  
三、程序代码 "X\6tl7a|  
(1Klj+"p%  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL dg4q+  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) FBS]U$1  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ GxA[N  
#if _MSC_VER > 1000 QFIYnxY9  
#pragma once @gk{wh>c  
#endif // _MSC_VER > 1000 [n&SA]a  
#ifndef __AFXWIN_H__ =a(]@8$!1  
#error include 'stdafx.h' before including this file for PCH 4}Yn!"jW&  
#endif I[bWd{i:  
#include "resource.h" // main symbols V:2{LR<R8  
class CHookApp : public CWinApp D/puK  
{ &S8,-~U  
 public: ["15~9  
  CHookApp(); ]r>m{"~E  
  // Overrides I.kuYD62  
  // ClassWizard generated virtual function overrides "/d  
  //{{AFX_VIRTUAL(CHookApp) N 'YzCq;M  
 public: YFeL#)5y  
  virtual BOOL InitInstance(); ))E| SAr  
  virtual int ExitInstance(); U|+ c&TY  
  //}}AFX_VIRTUAL 64t:  
  //{{AFX_MSG(CHookApp) !&R|P|7qN}  
  // NOTE - the ClassWizard will add and remove member functions here. "]U_o<V  
  // DO NOT EDIT what you see in these blocks of generated code ! 8j}o\!H  
  //}}AFX_MSG h}=  
  DECLARE_MESSAGE_MAP() VCa`|S?2  
}; 'L C0hoV  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ?%Gzd(YEY  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f s2}a  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); N V`=T?1[5  
BOOL InitHotkey(); \2M{R  
BOOL UnInit(); N$M:&m3^  
#endif /]9(InM9/  
rtz  ]PH  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 8@7leAq!  
#include "stdafx.h" t]8nRZ1  
#include "hook.h" ,ygDNF  
#include <windowsx.h> a2B9 .;F  
#ifdef _DEBUG ];\XA;aOl}  
#define new DEBUG_NEW =" pNE#  
#undef THIS_FILE #&ayWef  
static char THIS_FILE[] = __FILE__; pV/5w<_x?  
#endif `IJTO_  
#define MAX_KEY 100 (= W u5H  
#define CTRLBIT 0x04 =,Z5F`d4  
#define ALTBIT 0x02 VbX$\Cs:  
#define SHIFTBIT 0x01 EXti  
#pragma data_seg("shareddata") QI`&N(n  
HHOOK hHook =NULL; uLrZl0%HT~  
UINT nHookCount =0; d^I:{Ii'  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey c=33O,_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Z5,"KhB]  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ^tI4FQ>Y  
static int KeyCount =0; x]vyt}oCmk  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Q$A;Fk}-  
#pragma data_seg() YqYobL*q/  
HINSTANCE hins; k\A4sj  
void VerifyWindow(); &<t`EI];)4  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) E6#")2C~  
//{{AFX_MSG_MAP(CHookApp) -=)+)9~G  
// NOTE - the ClassWizard will add and remove mapping macros here. Q; BD|95nl  
// DO NOT EDIT what you see in these blocks of generated code! C;oO=R3r  
//}}AFX_MSG_MAP M2LW[z  
END_MESSAGE_MAP() &0 SgEUZr  
Nh1, w  
CHookApp::CHookApp() *kt%.wPJ  
{ %!]CP1S  
 // TODO: add construction code here, n,Q^M$mS0  
 // Place all significant initialization in InitInstance O}X@QG2_  
} VN]j*$5   
aEdc8i ?  
CHookApp theApp; spma\,o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ftP]WGSS>  
{ `bW0Va N  
 BOOL bProcessed=FALSE; )|KZGr  
 if(HC_ACTION==nCode) <"nF`'olV  
 { (>`S{L C>s  
  if((lParam&0xc0000000)==0xc0000000){// Key up %S<))G  
   switch(wParam) lhB;jE  
   { + De-U.  
    case VK_MENU: 1aoKf F(  
     MaskBits&=~ALTBIT; F **/T  
     break; P7*?E*   
    case VK_CONTROL: c!]yT0v&s  
     MaskBits&=~CTRLBIT; 6k;>:[p  
     break; 1HUe8m[#3  
    case VK_SHIFT: B*n_ VBd  
     MaskBits&=~SHIFTBIT; L\\'n )  
     break;  ja^  
    default: //judge the key and send message 6<No_x |_  
     break; 5E}!TL$  
   } PKYm{wO-  
   for(int index=0;index<MAX_KEY;index++){ U%KsD 4B  
    if(hCallWnd[index]==NULL) fDwqu.K  
     continue; YZz8xtM<2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !jRs5{n^Ol  
    { [>|6qY$D  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Zz!yv(e)H  
     bProcessed=TRUE; XF?"G<2  
    } j4$NQ]e^4  
   } >z k6{kC  
  } % E 8s>D  
  else if((lParam&0xc000ffff)==1){ //Key down V@\A<q%jTs  
   switch(wParam) e%^PVi  
   { Pl&x6\zL  
    case VK_MENU: dl+:u}9M$  
     MaskBits|=ALTBIT; 6nW]Q^N}  
     break; a6hDw'8!  
    case VK_CONTROL: B0,C!??5  
     MaskBits|=CTRLBIT; %[BOe4[  
     break; /m h #o  
    case VK_SHIFT: ?y,z  
     MaskBits|=SHIFTBIT; {r:5\  
     break; A4Tjfc,rx9  
    default: //judge the key and send message [y(<1]i-a  
     break; T)MZ`dM  
   } $mn+  
   for(int index=0;index<MAX_KEY;index++) AhQsv.t   
   { Em/? 4&  
    if(hCallWnd[index]==NULL) p`}G" DM  
     continue; .ViOf){U\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !XT2'6nu  
    { B X Et]+Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Mi7LyIu  
     bProcessed=TRUE; %+L3Xk]m'  
    } :@^T^  
   } \8/$ZEom  
  } BP8jReX^  
  if(!bProcessed){ @%I-15Jz  
   for(int index=0;index<MAX_KEY;index++){ j0A9;AP;;C  
    if(hCallWnd[index]==NULL) CMU\DO  
     continue; i:x<Vi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 'nfdOX.d  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); c='uyx  
   } 2@:Ztt6~  
  } r~PVh?  
 } D4PjE@D"H  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); AIt;~x  
} f# sDG  
Ummoph7_@  
BOOL InitHotkey() }W nvz;]B  
{ :F?L,I,K  
 if(hHook!=NULL){ 'J_6SD  
  nHookCount++; :F pt>g  
  return TRUE; ah15 ,<j  
 } +%)bd  
 else >44,Dp]  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 8WLBq-]G  
  if(hHook!=NULL) oTk?a!Q  
   nHookCount++; 8 G:f[\^  
  return (hHook!=NULL); y hNy  
} 5wa!pR\c  
BOOL UnInit() |[MtUWEW  
{ A8j$c~  
 if(nHookCount>1){ {3K`yDF  
  nHookCount--; /N=M9i\;  
  return TRUE; SD]rYIu+  
 } y#-~L-J_R  
 BOOL unhooked = UnhookWindowsHookEx(hHook); quiX "lV(  
 if(unhooked==TRUE){ >"pHk@AWK  
  nHookCount=0; e{}vT$-  
  hHook=NULL; Y9y'`}+  
 } <MgC7S2I  
 return unhooked; LmjGU[L,@  
} SH;:bLk_  
V~S(cO[vj  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) D9higsN  
{ ejlau#8"  
 BOOL bAdded=FALSE; ~~{+?v6B]  
 for(int index=0;index<MAX_KEY;index++){ AQgm]ex<  
  if(hCallWnd[index]==0){  t`'5|  
   hCallWnd[index]=hWnd; mZ#h p}\.  
   HotKey[index]=cKey; b$=c(@]  
   HotKeyMask[index]=cMask; -02.n}u>  
   bAdded=TRUE; !">EZX  
   KeyCount++; j&Y{ CFuZ  
   break; lBNB8c0e"{  
  } .t$1B5  
 } "T' QbK0  
 return bAdded; [ Ru ( H  
} 0;2ApYks  
Ex4)R2c*  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) a5uBQ?  
{ ]w~ECP(ap  
 BOOL bRemoved=FALSE; c>L#(D\\  
 for(int index=0;index<MAX_KEY;index++){ ^d!I{ y#  
  if(hCallWnd[index]==hWnd){ #oxP,LR  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ l#rr--];  
    hCallWnd[index]=NULL; q;9OqArq  
    HotKey[index]=0; k1Sr7|  
    HotKeyMask[index]=0; {1[f9uPS  
    bRemoved=TRUE; zQx6r .  
    KeyCount--; .[S\&uRv  
    break; -E-e!  
   } j&"GE':Y  
  }  ].3@ Dk  
 } @%rj1Gn  
 return bRemoved; +=#@1k~  
} !X+}W[Ic^  
3'6by!N,d  
void VerifyWindow() tiTh7qYi9  
{ /9SNXjfbt  
 for(int i=0;i<MAX_KEY;i++){ cb%ML1c  
  if(hCallWnd!=NULL){ :?H1h8wbCt  
   if(!IsWindow(hCallWnd)){ gCv[AIE_m  
    hCallWnd=NULL; \x=!'  
    HotKey=0; >W^)1E,Qh  
    HotKeyMask=0; EL;OYW(  
    KeyCount--; ]vZ}4Xno  
   } M nDa ag  
  } "rR$2`v"  
 } # #/ l  
} SI:Iv:>  
x)-n[Fu  
BOOL CHookApp::InitInstance() N3@gvS  
{ dW#?{n-H<  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); =[IKwmCX  
 hins=AfxGetInstanceHandle(); -'RD%_  
 InitHotkey(); \ bv JZ_  
 return CWinApp::InitInstance(); ]h}O&K/  
} hpz DQ6-Y  
oZ!+._9  
int CHookApp::ExitInstance() eNFZD1mS  
{ qHC/)M#L  
 VerifyWindow(); !&5B&w{u~!  
 UnInit(); Jb]22]  
 return CWinApp::ExitInstance(); Wo<kKkx2  
} :0(:}V3z\  
CC XOxd  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ;-!O+c  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) -ei+r#  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ [<IJ{yfx  
#if _MSC_VER > 1000 L?r\J8Ch<  
#pragma once p@%H. 5&&  
#endif // _MSC_VER > 1000  Y$nI9  
<M M(Z  
class CCaptureDlg : public CDialog fx = %e  
{ `;z;=A*  
 // Construction Zie t-@}  
 public: G|)fZQ1nS  
  BOOL bTray; % e1`wMa  
  BOOL bRegistered; SOQR(UT  
  BOOL RegisterHotkey(); ;N!W|G  
  UCHAR cKey; ki9vJ<  
  UCHAR cMask; NA9ss  
  void DeleteIcon(); jn#Ok@tZ  
  void AddIcon(); n /Dk~Q)  
  UINT nCount; `g:bvIV5x>  
  void SaveBmp(); 8|-064i>  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 95 oh}c  
  // Dialog Data d6{0[T^L  
  //{{AFX_DATA(CCaptureDlg) y\}<N6  
  enum { IDD = IDD_CAPTURE_DIALOG }; l#;o^H i  
  CComboBox m_Key; H?)?(t7@  
  BOOL m_bControl; 4zx_L8#Z  
  BOOL m_bAlt; 8AIAv_ g  
  BOOL m_bShift; .:2=VLujU  
  CString m_Path; DWcEl:  
  CString m_Number; Gkz~x Qy1T  
  //}}AFX_DATA x<h-F  
  // ClassWizard generated virtual function overrides &z%DX   
  //{{AFX_VIRTUAL(CCaptureDlg)  7K &j  
 public: J_>nn  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 5MS5 Q]/  
 protected: {y==8fCJ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _`q ei0  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Fn*)!,)  
  //}}AFX_VIRTUAL &-4SA j  
  // Implementation =\)qUs\z  
 protected: #(d /A<  
  HICON m_hIcon; o]m56  
  // Generated message map functions BV6 U -  
  //{{AFX_MSG(CCaptureDlg) LKI2R_|n  
  virtual BOOL OnInitDialog(); M;1B}x@  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Ub<^;Du5  
  afx_msg void OnPaint(); <!I^xo [  
  afx_msg HCURSOR OnQueryDragIcon(); dJUI.!hv;  
  virtual void OnCancel(); `&qeSEs\  
  afx_msg void OnAbout(); =-8y =  
  afx_msg void OnBrowse(); {^SHIL  
  afx_msg void OnChange(); YOY{f:ew  
 //}}AFX_MSG * AjJf)o  
 DECLARE_MESSAGE_MAP() cO/.(KBF  
}; R*z:+p}oHy  
#endif R#33AC CX  
F)4;:".zna  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file S9@)4|3C|p  
#include "stdafx.h" h,)UB1  
#include "Capture.h" \_PD@A9  
#include "CaptureDlg.h" &g\?znF]H  
#include <windowsx.h> e?eX9yA7F  
#pragma comment(lib,"hook.lib") j#JE4(&  
#ifdef _DEBUG tCirdwmg  
#define new DEBUG_NEW bAm ,gP  
#undef THIS_FILE YlEV@  
static char THIS_FILE[] = __FILE__; `KzNBH,W  
#endif C9}m-N  
#define IDM_SHELL WM_USER+1 N.qS;%*o{e  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ] ! :0^|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <%Afa#  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; y|[YEY U)  
class CAboutDlg : public CDialog %[7<GcWl  
{ WbDD9ZS  
 public: EJZb3  
  CAboutDlg(); L$<(HQQ J8  
  // Dialog Data Fg -4u&Ik  
  //{{AFX_DATA(CAboutDlg) |4A938'4j  
  enum { IDD = IDD_ABOUTBOX }; ck\gazo~q  
  //}}AFX_DATA Yeb-u+23  
  // ClassWizard generated virtual function overrides 0@*EwI  
  //{{AFX_VIRTUAL(CAboutDlg) ;c~%:|  
 protected: Hy0l"CA*|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support V( bU=;Qo  
  //}}AFX_VIRTUAL  R7-+@  
  // Implementation ejI nJ  
 protected: O^yD b  
  //{{AFX_MSG(CAboutDlg) }wR&0<HA  
  //}}AFX_MSG lpHz*NZ0  
  DECLARE_MESSAGE_MAP() u &s>UkR  
}; GK-__Y.  
b_xGCBC  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) DqTp*hI  
{ [d/uy>z,  
 //{{AFX_DATA_INIT(CAboutDlg) @I,:(<6  
 //}}AFX_DATA_INIT Ve\=By-a|  
} 1 !`B8y)  
4Hcds9y9  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) mzh7E[S_,i  
{ Wo8.tu-2  
 CDialog::DoDataExchange(pDX); Zfub+A  
 //{{AFX_DATA_MAP(CAboutDlg) hh ynB^o  
 //}}AFX_DATA_MAP +_E 96`P  
} tOf18V{a  
R2!_)Rpf  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) NA9N#;  
 //{{AFX_MSG_MAP(CAboutDlg) 5fVm392+  
 // No message handlers #K _E/~  
 //}}AFX_MSG_MAP 8{ iFxTz  
END_MESSAGE_MAP() { WW!P,w  
3D/<R|p  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) FR9*WI   
: CDialog(CCaptureDlg::IDD, pParent) U6Ws#e  
{ }|!9aojr  
 //{{AFX_DATA_INIT(CCaptureDlg) /~B \1  
  m_bControl = FALSE; #+]-}v3  
  m_bAlt = FALSE; 9#A&Qvyywg  
  m_bShift = FALSE; 4x%R4tk  
  m_Path = _T("c:\\"); |37y ="  
  m_Number = _T("0 picture captured."); bTN0n  
  nCount=0; ?3) IzzO  
  bRegistered=FALSE; TB  
  bTray=FALSE; /WX 0}mWu  
 //}}AFX_DATA_INIT D%NVqk|  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 BavGirCp  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 't:s6  
} #>/s tU-  
m^rrbU+HM?  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) iS%md  
{ b`Agb <x"  
 CDialog::DoDataExchange(pDX); >4N=P0=  
 //{{AFX_DATA_MAP(CCaptureDlg) o$FYCz n  
  DDX_Control(pDX, IDC_KEY, m_Key); E5U{.45  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); )@OKL0t  
  DDX_Check(pDX, IDC_ALT, m_bAlt); q VcZF7  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); f-b#F2I  
  DDX_Text(pDX, IDC_PATH, m_Path); Kc[Y .CH  
  DDX_Text(pDX, IDC_NUMBER, m_Number); #(KE9h%  
 //}}AFX_DATA_MAP ij/5m-{6)  
} P:8P>#L  
HD& Ag  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) d|c> Y(  
//{{AFX_MSG_MAP(CCaptureDlg)  @rT}V>2I  
 ON_WM_SYSCOMMAND() vx&jI$t8  
 ON_WM_PAINT() A(#4$}!n5  
 ON_WM_QUERYDRAGICON() *f4BD||  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) n :P5m9T  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) jLLZZPBK  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Mm'q4DV^  
//}}AFX_MSG_MAP Jm(sx'qPx  
END_MESSAGE_MAP() .]\+JTm  
hXE_OXZ  
BOOL CCaptureDlg::OnInitDialog() b=-LQkcZhK  
{ iB=v >8l%  
 CDialog::OnInitDialog(); JIobs*e0m  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); x\m?*5p  
 ASSERT(IDM_ABOUTBOX < 0xF000); r-+S^mOE]  
 CMenu* pSysMenu = GetSystemMenu(FALSE); > l@ o\  
 if (pSysMenu != NULL) a'pJg<  
 { S@'yuAe*G  
  CString strAboutMenu; R:LT hFx  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ~wdKO7fs  
  if (!strAboutMenu.IsEmpty()) ?{Gf'Y}y&  
  { H#+?)<UQ  
   pSysMenu->AppendMenu(MF_SEPARATOR); m {)F9F  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); \HsrUZ~  
  } [,1\>z|&  
 } 0,x<@.pW  
 SetIcon(m_hIcon, TRUE); // Set big icon EN!Q]O|  
 SetIcon(m_hIcon, FALSE); // Set small icon :',Q6j(s  
 m_Key.SetCurSel(0); 7P2?SW^  
 RegisterHotkey(); +UTs2*H/^  
 CMenu* pMenu=GetSystemMenu(FALSE); AX= 4{b'  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); TT0~41&l  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 1-=zSWmyK  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 1*>lYd8 _  
 return TRUE; // return TRUE unless you set the focus to a control DE^@b+6  
} \?X'U:  
^8#;>+7R  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Q41eYzAi  
{ Nhm)bdv]  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) YdI&OzaroE  
 { ]1XJQW@gF  
  CAboutDlg dlgAbout; H)${"  
  dlgAbout.DoModal(); IO4 8sV }  
 } < x==T4n/  
 else 6*:mc  
 { \?9{H6<=  
  CDialog::OnSysCommand(nID, lParam); 6UkX?I`>  
 } sP+ZE>7  
} JN Ur?+g  
k^ZcgHHgb  
void CCaptureDlg::OnPaint() nd 5w|83  
{  !AGjiP$  
 if (IsIconic()) E2D}F@<]  
 { h 'F\9t  
  CPaintDC dc(this); // device context for painting ny. YkN2  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); !VfP#B6.  
  // Center icon in client rectangle dt efDsK  
  int cxIcon = GetSystemMetrics(SM_CXICON); > $#v\8  
  int cyIcon = GetSystemMetrics(SM_CYICON); _Zq2 <:  
  CRect rect; @sV6g?{tI  
  GetClientRect(&rect); nDh D"rc  
  int x = (rect.Width() - cxIcon + 1) / 2; ]} + NT  
  int y = (rect.Height() - cyIcon + 1) / 2; '{t&!M`  
  // Draw the icon }Z~& XL=  
  dc.DrawIcon(x, y, m_hIcon); q i27:oJ  
 } -Xw i}/OX  
 else QE.a2 }  
 { B-<H8[GkG1  
  CDialog::OnPaint(); `XJU$c  
 } r3hUa4^97  
} -]?F  
v$H]=y  
HCURSOR CCaptureDlg::OnQueryDragIcon() ft"B,  
{ ftqi>^i  
 return (HCURSOR) m_hIcon; yE\dv)(<  
} >c~ Fg s  
lAM"l)Ij  
void CCaptureDlg::OnCancel() Of*z9 YI  
{ ^@&RJa-kb  
 if(bTray) 0PK*ULwSN  
  DeleteIcon(); 3r)<:4a u&  
  CDialog::OnCancel(); ^_cR  
} GV5hmDzRs  
?G#T6$E8  
void CCaptureDlg::OnAbout() 5DHFxym'  
{ /kAu&}  
 CAboutDlg dlg; ^E5[~C*o3  
 dlg.DoModal(); Vko1{$}t  
} W* XG9  
d +]Gw  
void CCaptureDlg::OnBrowse() 8mCL3F  
{ ~ [por  
 CString str; er0hf2N]  
 BROWSEINFO bi; O%(E 6 n  
 char name[MAX_PATH]; q x1}e  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ~t $zypw  
 bi.hwndOwner=GetSafeHwnd(); 8?L7h\)-  
 bi.pszDisplayName=name; g]=w_  
 bi.lpszTitle="Select folder"; GTw3rD^wg  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; yH<^txNF  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Y+k)d^6r  
 if(idl==NULL) &wlSOC')j  
  return; P(1 bd"Q  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); pMB~Lt9  
 str.ReleaseBuffer(); 5df~] -=0Y  
 m_Path=str; {~"&$DY2  
 if(str.GetAt(str.GetLength()-1)!='\\') G|Du/XYh  
  m_Path+="\\"; v$O%U[e<  
 UpdateData(FALSE); \` |*i$  
} A&$oiLc  
$_6DvJ0  
void CCaptureDlg::SaveBmp() =)B@`"  
{ 3MR4yw5v  
 CDC dc; LM*#DLadk  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); _VeZ lk7 k  
 CBitmap bm; Kw%n;GFl'  
 int Width=GetSystemMetrics(SM_CXSCREEN); Hw1<! Dyv  
 int Height=GetSystemMetrics(SM_CYSCREEN); a8#6}`|C?  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Ol,Tw=?  
 CDC tdc; qc*z`Wz:  
 tdc.CreateCompatibleDC(&dc); SWX;sM  
 CBitmap*pOld=tdc.SelectObject(&bm); UqaLTdYG  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); %n3lm(-0U  
 tdc.SelectObject(pOld); m17H#!`  
 BITMAP btm; {%S>!RA  
 bm.GetBitmap(&btm); >g+ogwZ  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; xwwy9:ze*l  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); J~0_  
 BITMAPINFOHEADER bih; >-s\$8En'  
 bih.biBitCount=btm.bmBitsPixel; B rGaCja  
 bih.biClrImportant=0; DQ{Yr>J  
 bih.biClrUsed=0; >f [Lb|t  
 bih.biCompression=0;  )"im|9  
 bih.biHeight=btm.bmHeight; vwZrvjP2  
 bih.biPlanes=1; -?A,N,nnX  
 bih.biSize=sizeof(BITMAPINFOHEADER); 2d,q?VH$  
 bih.biSizeImage=size; je^!W?U4<  
 bih.biWidth=btm.bmWidth; k{/2vV[`]  
 bih.biXPelsPerMeter=0; {xm^DT  
 bih.biYPelsPerMeter=0; +gG6(7&+=  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); V@0Z\&  
 static int filecount=0; QMGMXa   
 CString name; S C8r.  
 name.Format("pict%04d.bmp",filecount++); 7b,5*]oZ  
 name=m_Path+name; : QK )Ym  
 BITMAPFILEHEADER bfh; qwlIz/j  
 bfh.bfReserved1=bfh.bfReserved2=0; 7|A9  
 bfh.bfType=((WORD)('M'<< 8)|'B'); FK MuRy|  
 bfh.bfSize=54+size; PYldqY   
 bfh.bfOffBits=54; T@[(FVA N  
 CFile bf; OY'490  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ sLE@Cm]k  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); *&b~cyC  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); QU/Q5k  
  bf.WriteHuge(lpData,size); C.r9)#G  
  bf.Close(); "#T3l^@  
  nCount++; 1C[j:Ly/  
 } >&0)d7Nu8m  
 GlobalFreePtr(lpData); RO-ABFEi(  
 if(nCount==1) i-(^t1c  
  m_Number.Format("%d picture captured.",nCount); 6m_whGosi  
 else %&L]k>n^  
  m_Number.Format("%d pictures captured.",nCount); VU1 ;ZJ E  
  UpdateData(FALSE); 6vVx>hFJ47  
} O`nrXC{  
<lHelX=/  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) V9:h4]  
{ DP=4<ES%+  
 if(pMsg -> message == WM_KEYDOWN) n3, ?klK  
 { M@e&uz!Rx  
  if(pMsg -> wParam == VK_ESCAPE) LQ5WS  
   return TRUE; k T$yHB #  
  if(pMsg -> wParam == VK_RETURN) ZyBNo]  
   return TRUE; rz c}2I  
 } o#X|4bES  
 return CDialog::PreTranslateMessage(pMsg); _ri1RK,  
} 1LTl=tS#  
;~Eb Q  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $:I~y| !1  
{ @D!KFJ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 0ad -4  
  SaveBmp(); Jsi [,|G  
  return FALSE; uf;^yQi  
} $9v:(:!Bm  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ y6|&bJ @  
 CMenu pop; T<*i($ [  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ~Uw **PT3M  
 CMenu*pMenu=pop.GetSubMenu(0); 6,j6,Q(67  
 pMenu->SetDefaultItem(ID_EXITICON); qGtXReK  
 CPoint pt; =;.#Bds  
 GetCursorPos(&pt); eW$G1h:  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); X4emhB  
 if(id==ID_EXITICON) =4z:Df  
  DeleteIcon(); _ukKzY  
 else if(id==ID_EXIT) 5b9v`6Kq  
  OnCancel(); -(FVTWi0  
 return FALSE; \BC|`)0h  
} h>,yqiY4p  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); "j5b$T0P>  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) @q9uU9c  
 AddIcon(); &:g5+([<  
 return res; OczVObbS  
} | fAt[e_E  
&(h~{  
void CCaptureDlg::AddIcon() "R-1 G/  
{ yBKkx@o#z  
 NOTIFYICONDATA data; M IPmsEdBi  
 data.cbSize=sizeof(NOTIFYICONDATA); Fy N@mX  
 CString tip; *bu/Ko]  
 tip.LoadString(IDS_ICONTIP); 0Zkb}F2-  
 data.hIcon=GetIcon(0); ~8AcW?4Z  
 data.hWnd=GetSafeHwnd(); Gd$odKtI  
 strcpy(data.szTip,tip); +:4J~Cuf  
 data.uCallbackMessage=IDM_SHELL; 1<_i7.{k  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <lh+mrXm  
 data.uID=98; tp2CMJc{L  
 Shell_NotifyIcon(NIM_ADD,&data); ;\=W=wL(  
 ShowWindow(SW_HIDE); hv 18V>8  
 bTray=TRUE; yyJ4r}TE  
} _K{hq<g  
N%{&%C6{  
void CCaptureDlg::DeleteIcon() ;+XiDEX0}  
{ "J(#|v0  
 NOTIFYICONDATA data; iivuH2/~?[  
 data.cbSize=sizeof(NOTIFYICONDATA); pX ]K-  
 data.hWnd=GetSafeHwnd(); mc_`:I=  
 data.uID=98; wXf_2qB9  
 Shell_NotifyIcon(NIM_DELETE,&data); is`Eqcj`dr  
 ShowWindow(SW_SHOW); iQpKcBx  
 SetForegroundWindow(); CMa~BOt#  
 ShowWindow(SW_SHOWNORMAL); gCAWRNp  
 bTray=FALSE; aF4vNUeG  
} hA)tad]  
w~>V2u_-  
void CCaptureDlg::OnChange() }0c  
{  Ex35  
 RegisterHotkey(); Wbc*x  
} /X)fWO S6  
Hk%m`|Z  
BOOL CCaptureDlg::RegisterHotkey() O.S(H1z<G  
{ VJ P]Jy_  
 UpdateData(); jJ-j   
 UCHAR mask=0; b@@`2O3"  
 UCHAR key=0; 6R% I)  
 if(m_bControl) X_XeI!,b  
  mask|=4; IGs!SXclCs  
 if(m_bAlt) C,:3z  
  mask|=2; Oa=0d;_  
 if(m_bShift) o|G.tBpKg  
  mask|=1; eX$P k:  
  key=Key_Table[m_Key.GetCurSel()]; `-S6g^Y  
 if(bRegistered){ 0%.l|~CE&  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ZK4/o  
  bRegistered=FALSE; jvn:W{'Q  
 } %76N$`{u  
 cMask=mask; n\ aG@X%oq  
 cKey=key; Px:PoOw\  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (</cu$w>H)  
 return bRegistered; Dt\F]\6sd  
} j E_a ++  
:i+Tf~k{  
  四、小结 Kr`Cr5v  
RP&H9>  
  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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