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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: d-1D:Hs?  
  dB6 ,pY(  
  一、实现方法 u'#/vT#l  
!;|#=A9  
  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: F*@2)  
E,.PT^au  
#pragma data_seg("shareddata") uM1$3<  
HHOOK hHook =NULL; //钩子句柄 #W)m({}  
UINT nHookCount =0; //挂接的程序数目 /-FV1G,h  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 |Qcz5M90e  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 #%nV\ Bl  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey T,9q~*"  
static int KeyCount =0; 2sIt~ Gn  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 PY7H0\S)  
#pragma data_seg() Anyy  
r_$*euh@  
  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。 @,.D]43  
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  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: r6uN6XCM  
"NA<^2W@J  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR XyN " Jr  
cKey,UCHAR cMask) JK< []>O  
{ }wiyEVAh{  
 BOOL bAdded=FALSE; jdJTOT  
 for(int index=0;index<MAX_KEY;index++){ @ !su7  
  if(hCallWnd[index]==0){ 8b'@_s!_  
   hCallWnd[index]=hWnd; !38KHq^|&  
   HotKey[index]=cKey; UU>+b:  
   HotKeyMask[index]=cMask; tNr'@ls  
   bAdded=TRUE; bI:W4y>I=  
   KeyCount++; 5e,u*J]  
   break; >eG<N@13p  
  } v2rO>NY4  
 } p2 1|  
 return bAdded; zTB&Wlt  
} u>9` ?O44  
//删除热键 C\5G43`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) QyVAs;  
{ /_m )D;!y  
 BOOL bRemoved=FALSE; Fdhgm{Y2s  
 for(int index=0;index<MAX_KEY;index++){ R`<2DC>h9  
  if(hCallWnd[index]==hWnd){ 7BU7sQjs  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ :<zIWje  
    hCallWnd[index]=NULL; H5Eso*v@  
    HotKey[index]=0; [nig^8  
    HotKeyMask[index]=0; ?} 8r h%  
    bRemoved=TRUE; Jg=!GU/::  
    KeyCount--; VrPsy) J68  
    break; p*0[:/4  
   } WC<[<uI*  
  } =U*D.p*%f  
 } ;@qS#7SRB  
 return bRemoved; >Vt2@Ee  
} 0ex.~S_Oj4  
J78.-J5 j0  
vwu/33  
  DLL中的钩子函数如下: *V',@NH#Os  
R&Nl!QTJj  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) H@@ 4n%MK  
{ asYk #;z\"  
 BOOL bProcessed=FALSE; ~;CNWJtcf(  
 if(HC_ACTION==nCode) \ZADY.ha  
 { b/a\{  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 /lUfxc4  
   switch(wParam) ;dUKFdKH}  
   {  nktGO  
    case VK_MENU: b)'CP Cu*  
     MaskBits&=~ALTBIT; eg/itty  
     break; WlQCPC  
    case VK_CONTROL: @;OsHudd  
     MaskBits&=~CTRLBIT; Hj r'C?[  
     break; =QVkY7  
    case VK_SHIFT: ^,I2 @OS  
     MaskBits&=~SHIFTBIT; 'k\j[fk/K  
     break; FhY#3-jH  
    default: //judge the key and send message R&(OWF;~,  
     break; ~wuCa!!A  
   } EQlb:;j  
   for(int index=0;index<MAX_KEY;index++){ {p1`[R&n#  
    if(hCallWnd[index]==NULL) %dPk,Ylz  
     continue; J.h` 0$!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /gF)msUF  
    { ^OQP;5 #K  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (K=0c 6M3=  
     bProcessed=TRUE; %]I#]jR  
    } aXj UDu7  
   } fB9,# F  
  } GalSqtbmDt  
  else if((lParam&0xc000ffff)==1){ //有键按下 QGfwvFm  
   switch(wParam) Z(|$[GZP[  
   { nm#23@uZ4K  
    case VK_MENU: WRu(F54Sk  
     MaskBits|=ALTBIT; 9R8q+2  
     break; 0,RYO :`  
    case VK_CONTROL: ;iX~3[]  
     MaskBits|=CTRLBIT; r2\%/9uO  
     break; r]cq|Nv8:  
    case VK_SHIFT: h+B7BjA>G  
     MaskBits|=SHIFTBIT;  Rw0|q  
     break; ^yB]_*WJ  
    default: //judge the key and send message lgiKNZgB?  
     break; x+4K,r;  
   } |x1OWm1:<  
   for(int index=0;index<MAX_KEY;index++){ %OgK{h  
    if(hCallWnd[index]==NULL) i kfJ!f  
     continue; W8^A{l4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &T,,fz$  
    { neM)(` gp  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); G 0pq'7B  
     bProcessed=TRUE; (.!9  
    } H(.9tuA  
   } .TA)|df ^  
  } El9T>!Z  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 79>x/jZka  
   for(int index=0;index<MAX_KEY;index++){ .Xp,|T  
    if(hCallWnd[index]==NULL) nD/B :0'  
     continue; 5PeYQ-B|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) WMC^G2 n  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 3_  J'+  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 p35)K5V  
   } LAk .f  
  } "W6cQsi  
 } ]'xci"qV`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); gBV4IQ  
} S\N l|U[  
" J9  
  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: 5fk A?Ecqq  
j7&#R+f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); P<R^eLZ<&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0o$RvxJ  
0(+<uo~6p1  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: m33&obSP  
i5le0lM  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Jm CHwyUK?  
{ ? 0X$ox  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) d>F7i~W  
 { ;/+<N  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 [/hoNCH!  
  SaveBmp(); !%R):^R8  
  return FALSE; Ld_uMe?Z  
 } %_:L_VD@  
 …… //其它处理及默认处理 19GF%+L ,  
} r&R~a9+)  
)R `d x  
UUWRC1EtI  
  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\|%=(x!*  
I52nQCXi  
  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。 0);5cbV7i  
;C*2Djb*n  
  二、编程步骤 ,?m@Ko7Y  
aOg9Dqtg)f  
  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"; YvG$2F|_)  
r>8`g Ahx  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Y~*p27@fR  
.&b^6$dC  
  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; Hz,Gn9:p  
/Hk})o_  
  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; Y{j~;G@Wl  
z@IG"D  
  5、 添加代码,编译运行程序。 g5 *E\T%8  
P51cEhf  
三、程序代码 r|}Pg}O  
7<70\ 6  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 5,XEN$^  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) }!fIY7gv  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ a+z>pV|  
#if _MSC_VER > 1000 2UYtEJ(?`{  
#pragma once `_LQs9J0J  
#endif // _MSC_VER > 1000 V$DB4YM1k  
#ifndef __AFXWIN_H__ ]E"J^mflGK  
#error include 'stdafx.h' before including this file for PCH do^=Oq07$  
#endif c[M4l  
#include "resource.h" // main symbols th*!EFA^o  
class CHookApp : public CWinApp vh2/d.MO  
{ Yqh-U%"'  
 public: ES,JdImZ|  
  CHookApp(); kPy7e~  
  // Overrides !Usmm8!K  
  // ClassWizard generated virtual function overrides 1^NC=IS9z  
  //{{AFX_VIRTUAL(CHookApp) 6%t6u3  
 public: [YlRz  
  virtual BOOL InitInstance(); $H@   
  virtual int ExitInstance(); + rB3\R"d  
  //}}AFX_VIRTUAL p Cx_[#DrP  
  //{{AFX_MSG(CHookApp) %Jl6e}!  
  // NOTE - the ClassWizard will add and remove member functions here. >N! Xey  
  // DO NOT EDIT what you see in these blocks of generated code ! mgjcA5z  
  //}}AFX_MSG gF9GU5T:  
  DECLARE_MESSAGE_MAP() Se[=$W  
}; [%LGiCU]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); D`41\#ti  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); m-C#~Cp36  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !4^Lv{1QZ  
BOOL InitHotkey(); P)y2'JKL  
BOOL UnInit(); ql.[Uq  
#endif arKf9`9  
M3KK^YRN  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ]D@aMC$#  
#include "stdafx.h" ' $yy  
#include "hook.h" 2@_3V_  
#include <windowsx.h> vbd ;Je"  
#ifdef _DEBUG nY;Sk#9  
#define new DEBUG_NEW 5<GeAW8ns]  
#undef THIS_FILE hQ:wW}HWW  
static char THIS_FILE[] = __FILE__; BHz_1+d  
#endif g;R  
#define MAX_KEY 100 _G4 U  
#define CTRLBIT 0x04 !2B~.!&   
#define ALTBIT 0x02 A ][ ;v  
#define SHIFTBIT 0x01 l8M}82_  
#pragma data_seg("shareddata") dc emF  
HHOOK hHook =NULL; DfkGNBY  
UINT nHookCount =0; @CR<&^s5V  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey QN#Lbsd  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ?zsRs?rc0  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey , =*^XlO=c  
static int KeyCount =0; 7dB_q}<  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift A Ef@o+A  
#pragma data_seg() WB (?6"  
HINSTANCE hins; S~z$ =IiB  
void VerifyWindow(); H,;ZFg/v8  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) U\{I09@E 0  
//{{AFX_MSG_MAP(CHookApp) [4;_8-[Nv  
// NOTE - the ClassWizard will add and remove mapping macros here. B2BG*xa  
// DO NOT EDIT what you see in these blocks of generated code! OPq6)(Q  
//}}AFX_MSG_MAP F-~Xbz%  
END_MESSAGE_MAP() k=Wt57jt  
WzdlrkD  
CHookApp::CHookApp() Eos;7$u[  
{ CucW84H`J  
 // TODO: add construction code here, @!x7jPr  
 // Place all significant initialization in InitInstance fk2Uxg=[  
} A&KY7[<AC{  
?<0'h{zNy  
CHookApp theApp; 3M^`6W[;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ze+S_{  
{ =fy.'+  
 BOOL bProcessed=FALSE; ]t17= Lr?  
 if(HC_ACTION==nCode)  ^LSD_R^N  
 { \ X6y".|-  
  if((lParam&0xc0000000)==0xc0000000){// Key up <T'fJcR  
   switch(wParam) b5|l8<\  
   { (7~vOWs:[  
    case VK_MENU: `yhc,5M  
     MaskBits&=~ALTBIT; l~f9F`~'  
     break; rw@N=`4P  
    case VK_CONTROL: 9)b{U2&  
     MaskBits&=~CTRLBIT; ,pZz`B#  
     break; LBpAR|  
    case VK_SHIFT: E>QEI;  
     MaskBits&=~SHIFTBIT; guy!/zQ>A  
     break; @[/!e`]+  
    default: //judge the key and send message Vhm^<I-d  
     break; sdewz(xskj  
   } %74f6\  
   for(int index=0;index<MAX_KEY;index++){ N'5DB[:c:  
    if(hCallWnd[index]==NULL) s.Mrd~(Drz  
     continue; 03 v\v9<T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "tK3h3/Xv  
    { La^Zr,T!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); N0 t26| A  
     bProcessed=TRUE; (hY^E(D  
    } 3U?^49bJ  
   } SN QLEe  
  } "VsS-b^P  
  else if((lParam&0xc000ffff)==1){ //Key down HqOnZ>D  
   switch(wParam) m1p% ,  
   { el^<M,7!  
    case VK_MENU: K^I$05idi  
     MaskBits|=ALTBIT; )gR3S%Ju  
     break; [h\_yU[ P  
    case VK_CONTROL: 7vH4}S\ q  
     MaskBits|=CTRLBIT; 2NL|_W/  
     break; d?CU+=A&|  
    case VK_SHIFT: DEv,!8  
     MaskBits|=SHIFTBIT; }u5J<*:bZ  
     break; 7w0=i Z>K  
    default: //judge the key and send message .= 8Es#  
     break; !\&4,l(  
   } uMC0XE|S  
   for(int index=0;index<MAX_KEY;index++) z8};(I>)  
   { yg4ILL  
    if(hCallWnd[index]==NULL) G_5NS<JE"S  
     continue; M?$tHA~OX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 52 DSKL  
    { O#U_mgfzJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4vH.B)S-  
     bProcessed=TRUE; t6+>Zr  
    } :~,akX$  
   } NL ceBok  
  }  ~#z b  
  if(!bProcessed){ XoiZ"zE  
   for(int index=0;index<MAX_KEY;index++){ 0ENqK2  
    if(hCallWnd[index]==NULL) AkqGk5e ^  
     continue; afcyAzIB&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1Imb"E  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0*u X2*  
   } JDMsco+j5  
  } Od]wh  
 } sy9YdPPE  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Y9(BxDP_+Y  
} Yr:$)ap  
*-_joAWTG  
BOOL InitHotkey() _lk5\bu  
{ t`4o&vsj=  
 if(hHook!=NULL){ Qc:Sf46O  
  nHookCount++; U09@pne8  
  return TRUE; RKz _GEH)  
 } yj`xOncE}  
 else C_hIPMU=  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); odq3@ ziO  
  if(hHook!=NULL) xm<sH!,j  
   nHookCount++; ^m^,:]I0P  
  return (hHook!=NULL); '8Lc}-M4  
} p WKpc  
BOOL UnInit() *WXqN!:  
{ %u$dN9cw  
 if(nHookCount>1){ ]GHx<5Q:\  
  nHookCount--; i0&] Ig|;  
  return TRUE; V P4ToYc  
 } i>rsq[l  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ; >>/}Jw\  
 if(unhooked==TRUE){ L2y{\<JC"  
  nHookCount=0; |.U- yyz  
  hHook=NULL; ,%]s:vk[u  
 } < 'qtqUL\  
 return unhooked; kI$p~  
} V=H}Ecd  
`_+m3vHG  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) QmB,~x{j>  
{ %O&C\{J  
 BOOL bAdded=FALSE; p$%g$K  
 for(int index=0;index<MAX_KEY;index++){ 0 :1ldU 4  
  if(hCallWnd[index]==0){ 12%4>2}~>  
   hCallWnd[index]=hWnd; `r8bBzr@%  
   HotKey[index]=cKey; 8 K>Ejr  
   HotKeyMask[index]=cMask; }=."X8zOI8  
   bAdded=TRUE; jLf87  
   KeyCount++; 15~+Ga4  
   break; r;aP`MVO<  
  } &@xeWB  
 } &28n1  
 return bAdded; Sst`*PX:  
} l{x?i00tAS  
Tn3f5ka'  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) d "vd_}P~  
{ ('px X+  
 BOOL bRemoved=FALSE; pDx}~IB  
 for(int index=0;index<MAX_KEY;index++){ Kx[z7]1@  
  if(hCallWnd[index]==hWnd){ -[`FNTTV C  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Aonq;} V e  
    hCallWnd[index]=NULL; Th//uI+  
    HotKey[index]=0; ud.Bzg:/  
    HotKeyMask[index]=0; 3#T_(  
    bRemoved=TRUE; RJI*ZNb A  
    KeyCount--; 6hm6h7$F1  
    break; Y_Lsmq2!  
   }  7QkAr  
  } ,s1n! @9  
 } X{riI^(  
 return bRemoved; <ByDT$E_  
} IN9o$CZ:  
MRHkQE+K@8  
void VerifyWindow() *:A )j?(  
{ `Lu\zR%<  
 for(int i=0;i<MAX_KEY;i++){ }UWRH.;v  
  if(hCallWnd!=NULL){ eL!G, W  
   if(!IsWindow(hCallWnd)){ /C}fE]n{X  
    hCallWnd=NULL; Kq0hT4w  
    HotKey=0; XUT\nN-N  
    HotKeyMask=0; L:F:ZOM6`  
    KeyCount--; jNNl5.  
   } t| zLR  
  } @V-CG!  
 } &_E*]Sj\  
} #0WO~wL  
cBA2;5E  
BOOL CHookApp::InitInstance() ,Pd2ZfZ  
{ [%8+Fa~Wa  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); "]`QQT-{0  
 hins=AfxGetInstanceHandle(); DD hc^(  
 InitHotkey(); h@D4~(r  
 return CWinApp::InitInstance(); gB@Wv9 1  
} .tb~f@xL  
ARu^hz=  
int CHookApp::ExitInstance() 5+O#5" v_  
{ <cz~q=%v2&  
 VerifyWindow(); wB( igPi  
 UnInit(); l9.wMs*`X  
 return CWinApp::ExitInstance(); ),6Z1 K1  
} $mOK|=tI_  
g%<7Px[W  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {:enoV"  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 6A/|XwfE/v  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ K~WwV8c9;  
#if _MSC_VER > 1000 Ja#idF[V  
#pragma once /qL&)24  
#endif // _MSC_VER > 1000 qQ6NxhQo  
9aC>gye!  
class CCaptureDlg : public CDialog HF\L`dJX?  
{ \ca4X{x  
 // Construction E%-&!%_>D@  
 public: $P@P}%2  
  BOOL bTray; J:mOg95<  
  BOOL bRegistered; %/MK$  
  BOOL RegisterHotkey(); wL 5).`oq  
  UCHAR cKey; s}9aZ  
  UCHAR cMask; Aq|LeH  
  void DeleteIcon(); ?t} [Wi}7  
  void AddIcon(); ]yVB66l  
  UINT nCount; XW Y0WDh:  
  void SaveBmp(); ^J~}KOH  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor .[Sv|;x"E  
  // Dialog Data *<#&ne 8  
  //{{AFX_DATA(CCaptureDlg) a}c(#ZLs  
  enum { IDD = IDD_CAPTURE_DIALOG }; 1 )j%]zd2  
  CComboBox m_Key; Z?hBn`.  
  BOOL m_bControl; }RUC#aW1  
  BOOL m_bAlt;  D#m+w  
  BOOL m_bShift; D0k7)\puQ  
  CString m_Path; D1O7S]j  
  CString m_Number; Vq'&t<K#  
  //}}AFX_DATA m9xu$z| e  
  // ClassWizard generated virtual function overrides }}(~'  
  //{{AFX_VIRTUAL(CCaptureDlg) \^-3)*r  
 public: XLbrE|0A?  
  virtual BOOL PreTranslateMessage(MSG* pMsg); bt&vik _  
 protected: Hab9~v ]  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O.K8$  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); vPwDV_zk  
  //}}AFX_VIRTUAL <qRw! 'S^  
  // Implementation `g :<$3}  
 protected: u%[*;@;9+  
  HICON m_hIcon; jv|IV  
  // Generated message map functions !Xj m h$F  
  //{{AFX_MSG(CCaptureDlg) rjR  
  virtual BOOL OnInitDialog(); {Ue6DK %  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); puqH%m+u  
  afx_msg void OnPaint(); >LU*F|F]B  
  afx_msg HCURSOR OnQueryDragIcon(); [bOy, ^@4  
  virtual void OnCancel(); >PGm}s_  
  afx_msg void OnAbout(); |_=jXf\TL  
  afx_msg void OnBrowse(); zPkg3H  
  afx_msg void OnChange(); W'0wTZG  
 //}}AFX_MSG oC[wYUDg  
 DECLARE_MESSAGE_MAP() Yu1xJgl  
}; \AK|~:\]  
#endif "?9fL#8f*!  
$qrr]U  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file sy@k3wQ  
#include "stdafx.h" bo -Gh`  
#include "Capture.h" y?unI~4tC  
#include "CaptureDlg.h" 7T2W% JT-,  
#include <windowsx.h> "+ Qh,fTt  
#pragma comment(lib,"hook.lib") M K[spV  
#ifdef _DEBUG =0]Mc$Ih  
#define new DEBUG_NEW [ $"iO#oO  
#undef THIS_FILE bL[PNUG  
static char THIS_FILE[] = __FILE__; Iw<c 9w8  
#endif [a |fm*B!  
#define IDM_SHELL WM_USER+1 mmKrmM*1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I] "$h]T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); RY~)MS _C  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; B6pz1P?e}  
class CAboutDlg : public CDialog Sl_zO?/PF  
{  #b"IX`5  
 public: YJ6vyG>%C  
  CAboutDlg(); ' R@<4Ib|  
  // Dialog Data */+s^{W7  
  //{{AFX_DATA(CAboutDlg) a "1$z`ln  
  enum { IDD = IDD_ABOUTBOX }; s]&y\Z  
  //}}AFX_DATA %!$-N!e  
  // ClassWizard generated virtual function overrides :<v$vER,&  
  //{{AFX_VIRTUAL(CAboutDlg) q9!#S  
 protected: D!sSe|sL^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support P< &/$x6  
  //}}AFX_VIRTUAL %8{_;-f  
  // Implementation OLR1/t`V  
 protected: !S-hv1bE  
  //{{AFX_MSG(CAboutDlg) M!jW=^\  
  //}}AFX_MSG )Ud S (Bj  
  DECLARE_MESSAGE_MAP() =Fs LF  
}; P3 Evv]sB@  
Ni)#tz_9  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Zn} )&Xt  
{ =!c+|X`  
 //{{AFX_DATA_INIT(CAboutDlg) J-ZM1HoB  
 //}}AFX_DATA_INIT gdZVc9 _  
} i;xMf5Jz  
<Ztda !  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) eJA{]^Zf  
{ .5ycO  
 CDialog::DoDataExchange(pDX); : [9'nR  
 //{{AFX_DATA_MAP(CAboutDlg) A X#!9-m3  
 //}}AFX_DATA_MAP U`Ag|R  
} A-u5  
=iQm_g  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) W.R'2R#  
 //{{AFX_MSG_MAP(CAboutDlg) Rp|&1nS  
 // No message handlers U;xWW9  
 //}}AFX_MSG_MAP @iceMD.  
END_MESSAGE_MAP() 3d<HIG^W}  
4|L@oTzx  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) dtBV0$  
: CDialog(CCaptureDlg::IDD, pParent) 3# (5Kco  
{ I7_D $a=  
 //{{AFX_DATA_INIT(CCaptureDlg) \xZBu"  
  m_bControl = FALSE; oQXkMKZ  
  m_bAlt = FALSE; 16Y~5JAc  
  m_bShift = FALSE;  e C{Z  
  m_Path = _T("c:\\"); JT9<kB/07  
  m_Number = _T("0 picture captured."); *!/#39  
  nCount=0; -]A#G`'  
  bRegistered=FALSE; .%<&W1  
  bTray=FALSE; 4~Pto f@  
 //}}AFX_DATA_INIT Ft rw3OxN  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 [L(l++.z  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 7 tpZE+OX  
} pdHb  
(R<4"QbE  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 3ky+qoe  
{ l1qwT0*6>  
 CDialog::DoDataExchange(pDX); B3t>M) 9  
 //{{AFX_DATA_MAP(CCaptureDlg) 1Qu,]i`  
  DDX_Control(pDX, IDC_KEY, m_Key); ;wxt<   
  DDX_Check(pDX, IDC_CONTROL, m_bControl); "6.p=te  
  DDX_Check(pDX, IDC_ALT, m_bAlt); &s;^q  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); -c?wEqa~2  
  DDX_Text(pDX, IDC_PATH, m_Path); +"cyOC  
  DDX_Text(pDX, IDC_NUMBER, m_Number); }_22 wjm~  
 //}}AFX_DATA_MAP Ve1] ECk  
} IpXhb[UZ?  
\KXEw2S  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) z{0;%E  
//{{AFX_MSG_MAP(CCaptureDlg) l,L=VDEz,  
 ON_WM_SYSCOMMAND() sr+mY;   
 ON_WM_PAINT() Av>j+O ;  
 ON_WM_QUERYDRAGICON() (NC>[  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) e:D"_B  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 9y*! W  
 ON_BN_CLICKED(ID_CHANGE, OnChange) DOIWhd5:  
//}}AFX_MSG_MAP -\$cGIL  
END_MESSAGE_MAP() RbM~E~$  
f4T0Y["QA  
BOOL CCaptureDlg::OnInitDialog() %pkq ?9  
{ %d J>8.jW@  
 CDialog::OnInitDialog(); @qy*R'+  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); b[;3KmUB  
 ASSERT(IDM_ABOUTBOX < 0xF000); 'aP*++^   
 CMenu* pSysMenu = GetSystemMenu(FALSE); }2A1Yt:^P  
 if (pSysMenu != NULL) `>EvT7u  
 { 5 hadA>d  
  CString strAboutMenu; Hk*cO;c  
  strAboutMenu.LoadString(IDS_ABOUTBOX); }n%R l\p  
  if (!strAboutMenu.IsEmpty()) D>e\OfTR:  
  { l1Q+hz5"*U  
   pSysMenu->AppendMenu(MF_SEPARATOR); 5l/l]  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); <^_Vl8%  
  } o'C.,ic?C  
 } >m1V9A  
 SetIcon(m_hIcon, TRUE); // Set big icon ^!F5Cz 48  
 SetIcon(m_hIcon, FALSE); // Set small icon o=# [^Zv  
 m_Key.SetCurSel(0); G?d,$NMo|  
 RegisterHotkey(); b ]&zDo|8  
 CMenu* pMenu=GetSystemMenu(FALSE); ?mR[A`J58  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); mh7sY;SvM  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); b N e\{k  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); gNN" H#=2  
 return TRUE; // return TRUE unless you set the focus to a control sg"D;b:X  
} Z"|P(]A  
xM//]  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) nSQ}yqM)  
{ sLi//P?:t  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) O\Mq<;|7m  
 { s8d}HI  
  CAboutDlg dlgAbout; xyjV dD\  
  dlgAbout.DoModal(); nCMa$+  
 } z12But\<  
 else X5|/s::u  
 { wy- C~b'Qd  
  CDialog::OnSysCommand(nID, lParam); [H%?jTQ  
 } ;Fem<p)V  
} 6Hbf9,vI  
q VdC?A|  
void CCaptureDlg::OnPaint() Gb|}Su  
{ _<*GU@  
 if (IsIconic()) EN)A"  
 { 7$'mC9  
  CPaintDC dc(this); // device context for painting SKpPR;=q|:  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); $dp#nyP  
  // Center icon in client rectangle 7(~H77  
  int cxIcon = GetSystemMetrics(SM_CXICON); kTZx-7~  
  int cyIcon = GetSystemMetrics(SM_CYICON); U%t/wq  
  CRect rect; 8{<[fZyC  
  GetClientRect(&rect); [&qbc#L  
  int x = (rect.Width() - cxIcon + 1) / 2; %;\G@q_p{  
  int y = (rect.Height() - cyIcon + 1) / 2; :6j :9lYL2  
  // Draw the icon *Z]WaDw  
  dc.DrawIcon(x, y, m_hIcon); /3[ 9{r  
 } 42>m,fb2[  
 else iqednk%  
 { [x<6v}fRn  
  CDialog::OnPaint(); bxdXZB n  
 } iE^a%|?}  
} V}|v!h[O8  
zYG,x*IH  
HCURSOR CCaptureDlg::OnQueryDragIcon() "8muMa8Q%  
{ IiK(^:~%  
 return (HCURSOR) m_hIcon; 90qj6.SQ  
} yLz,V}  
v^c<`i;  
void CCaptureDlg::OnCancel() z34>,0  
{ ^~6]0$yJ  
 if(bTray) pP0Vg'V  
  DeleteIcon(); !b]2q%XM  
  CDialog::OnCancel(); M=AvD(+ha  
} U7"BlT!V\  
H : T N  
void CCaptureDlg::OnAbout() .K@x4 /1  
{ q#(/*AoU  
 CAboutDlg dlg; SE^b0ZV*x  
 dlg.DoModal(); %]<RRH.w  
} \5[D7}  
D=~B7b:  
void CCaptureDlg::OnBrowse() 1U7,X6=~  
{ .b#9q6F-/  
 CString str; 2b#(X'ob  
 BROWSEINFO bi; wVp4c?s  
 char name[MAX_PATH]; {x|kg;  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); $,;S\JmWP  
 bi.hwndOwner=GetSafeHwnd(); '>e79f-O)  
 bi.pszDisplayName=name; P*SCHe'  
 bi.lpszTitle="Select folder"; zvGK6qCk  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; TsX+. i'  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); <4Q12:  
 if(idl==NULL) !b7'>b'J<1  
  return; m(Y.X=EZr  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); -jVaS w t  
 str.ReleaseBuffer(); Be{/2jU%  
 m_Path=str; Cfr<D3&,]  
 if(str.GetAt(str.GetLength()-1)!='\\') JEsLF{  
  m_Path+="\\"; ;wbUk5Tf/  
 UpdateData(FALSE); =a9etF%B  
} M 20Bc,VI  
z9M.e.  
void CCaptureDlg::SaveBmp() "brRME3  
{ t$K@%yU2  
 CDC dc; SH vaV[C  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;vJ\]T ml  
 CBitmap bm; 2Io6s '  
 int Width=GetSystemMetrics(SM_CXSCREEN); Ns2,hQFc  
 int Height=GetSystemMetrics(SM_CYSCREEN); m4"N+_j  
 bm.CreateCompatibleBitmap(&dc,Width,Height); %GX uuE}mX  
 CDC tdc; Q54r?|'V  
 tdc.CreateCompatibleDC(&dc); ^`rpf\GX(  
 CBitmap*pOld=tdc.SelectObject(&bm); d@4rD}_Z  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY);  dd<:#c9  
 tdc.SelectObject(pOld); pgLtD};S  
 BITMAP btm; 4bi NGl~  
 bm.GetBitmap(&btm); e"fN~`NhY  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; =naR{pI  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); AfRW=&xdT  
 BITMAPINFOHEADER bih; SE^j=1  
 bih.biBitCount=btm.bmBitsPixel; zJ;>.0  
 bih.biClrImportant=0; 2e9jo,i  
 bih.biClrUsed=0; bo@,4xw  
 bih.biCompression=0; Q(510)  
 bih.biHeight=btm.bmHeight; Xnv@H:$mxk  
 bih.biPlanes=1; 8K0X[-hs8  
 bih.biSize=sizeof(BITMAPINFOHEADER); `KpFH.k.K  
 bih.biSizeImage=size; \ ]   
 bih.biWidth=btm.bmWidth; 7}4'dW.  
 bih.biXPelsPerMeter=0; OM.k?1%+M  
 bih.biYPelsPerMeter=0; TN35CaSmq  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); +Edzjf~Tt  
 static int filecount=0; oW 1"%i%  
 CString name; <4bz/^  
 name.Format("pict%04d.bmp",filecount++); L[?nST18%  
 name=m_Path+name; A8pj~I/*-  
 BITMAPFILEHEADER bfh; 7]Al*)  
 bfh.bfReserved1=bfh.bfReserved2=0; }zFf0.82  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Vb@ 4(Q  
 bfh.bfSize=54+size; mZ~qG5@/F  
 bfh.bfOffBits=54; 7}be>(  
 CFile bf; z % x7fe  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ RU2c*q$^X  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); gmh5 %2M  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); <B6[i*&  
  bf.WriteHuge(lpData,size); 01udlW.  
  bf.Close(); ~U6" ?  
  nCount++; VeZey)Q  
 } OAv>g pw  
 GlobalFreePtr(lpData); iF!mV5#  
 if(nCount==1) Sd},_Kh  
  m_Number.Format("%d picture captured.",nCount); pDu{e>S|:  
 else *AZ?~ i^o  
  m_Number.Format("%d pictures captured.",nCount); v`JF\"}S  
  UpdateData(FALSE); N.Dhu~V  
} #HeM,;Xp  
25:Z;J>  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ddsUz1%l  
{ 0$6*o}N%  
 if(pMsg -> message == WM_KEYDOWN) *5'.!g('  
 { .~3kGf":  
  if(pMsg -> wParam == VK_ESCAPE) CRFCqmevR  
   return TRUE; v "Me{+  
  if(pMsg -> wParam == VK_RETURN) 6*IpAIh  
   return TRUE; \PpXL*.  
 } 7K&}C;+  
 return CDialog::PreTranslateMessage(pMsg); OL3UgepF  
} E\0X`QeY  
?O??cjiA@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }g`Gh|C  
{ 8L%M<JRg~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ -hWC_X:9jP  
  SaveBmp(); ;DuXS y!g  
  return FALSE; [C1 LT2a  
} bAf,aV/C&|  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ g\U/&.}DN  
 CMenu pop; wtXY: O  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); %Rp8{.t7  
 CMenu*pMenu=pop.GetSubMenu(0); AoYaVlKG8  
 pMenu->SetDefaultItem(ID_EXITICON); IdPn%)>6  
 CPoint pt; bd!U)b(}OV  
 GetCursorPos(&pt); Cq>6rn  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); fN-Gk(Ic  
 if(id==ID_EXITICON) -ynBi;nH  
  DeleteIcon(); 1dFa@<5  
 else if(id==ID_EXIT) V<8K@/n@  
  OnCancel(); 62[8xn=(%  
 return FALSE; 3HZ~.  
} J~KX|QY.S  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 8eluO ?p  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) %j7:tf=  
 AddIcon(); k=[pm5ZvT~  
 return res; 0GZq`a7[  
} DAdYg0efex  
['cz;2{:W  
void CCaptureDlg::AddIcon() 4KXc~eF[M"  
{ %-+j  
 NOTIFYICONDATA data; GIT #<+"  
 data.cbSize=sizeof(NOTIFYICONDATA); IG< H"tQ  
 CString tip; J8?2R^;{  
 tip.LoadString(IDS_ICONTIP); DP 9LO_{  
 data.hIcon=GetIcon(0); vE%s, E,  
 data.hWnd=GetSafeHwnd(); 3e%nA8?  
 strcpy(data.szTip,tip); FJeiY#us  
 data.uCallbackMessage=IDM_SHELL; gAt~?HvW6  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; tx"LeZZ  
 data.uID=98; x)SralWb  
 Shell_NotifyIcon(NIM_ADD,&data); m:uPEpcU  
 ShowWindow(SW_HIDE); +dk f cG  
 bTray=TRUE; [:h5}  
} ;HNq>/{  
<8!  Tq  
void CCaptureDlg::DeleteIcon() ;au*V5a%  
{ ,zhJY ?sk  
 NOTIFYICONDATA data; 2N5`'  
 data.cbSize=sizeof(NOTIFYICONDATA); v4rW2F:X  
 data.hWnd=GetSafeHwnd(); :^i^0dC  
 data.uID=98; p[9s<lEh  
 Shell_NotifyIcon(NIM_DELETE,&data); |mhKIis U  
 ShowWindow(SW_SHOW); eQUe >*  
 SetForegroundWindow(); d(-EcY>?  
 ShowWindow(SW_SHOWNORMAL); \OQkZ.cU;  
 bTray=FALSE; Apj;  
} H4:&%"j7  
?>$l  
void CCaptureDlg::OnChange() N\NyXh$  
{ ;),"M{"v  
 RegisterHotkey(); =wVJ%  
} AiP!hw/V$  
f>2MI4nMG  
BOOL CCaptureDlg::RegisterHotkey() h!gk s-0  
{ iafE5b)  
 UpdateData(); s?2$ue&-f  
 UCHAR mask=0; ) 1 m">s4  
 UCHAR key=0; u0 QzLi,  
 if(m_bControl) SJ?cI!=x  
  mask|=4; tyh@ ^7  
 if(m_bAlt) W/fuKGZi_  
  mask|=2; );FS7R  
 if(m_bShift) kLj$@E`4  
  mask|=1; @WMA}\Cc  
  key=Key_Table[m_Key.GetCurSel()]; .uF[C{RnO  
 if(bRegistered){ :|+Qe e  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); KC`q#&dt  
  bRegistered=FALSE; G2Vv i[c  
 } eJ0?=u!x  
 cMask=mask; I_1e?\  
 cKey=key; v{aq`uH  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); W,XTF  
 return bRegistered; oGa^/:6L  
} t]aea*B  
99xEm  
  四、小结 83%)/_&  
S35~Cp  
  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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