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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: gB#t"s)  
  G.8ZISN/  
  一、实现方法 W:G*t4i  
t!LvV.g+  
  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: 2vLn#  
#kA+Yqy \)  
#pragma data_seg("shareddata") &M0v/!%L  
HHOOK hHook =NULL; //钩子句柄 C;|Ru*  
UINT nHookCount =0; //挂接的程序数目 2 Qy&V/E ?  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 tee%E=P  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 uU0'y4=  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey &H6Fkza;4  
static int KeyCount =0; bV ym  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ;nbvn  
#pragma data_seg() 9,IGZ55C  
FqySnrJQ  
  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。 `B~%TEvMh  
cD]t%`*  
  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: P=.W.oS  
~rD* Y&#.  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR I`7[0jA~  
cKey,UCHAR cMask) MLl:)W*  
{ pmZr<xs   
 BOOL bAdded=FALSE; 4U3T..wA  
 for(int index=0;index<MAX_KEY;index++){ rQF%;  
  if(hCallWnd[index]==0){ :HC{6W`$  
   hCallWnd[index]=hWnd; q :gH`5N  
   HotKey[index]=cKey; >*&[bW'}?  
   HotKeyMask[index]=cMask; \W4SZR%u  
   bAdded=TRUE; OWU]gh@r  
   KeyCount++; c8'?Dd  
   break; ;XjKWM;  
  } TSeAC[%pL  
 } 3't?%$'5  
 return bAdded; IlY,V  
} TX;|g1K  
//删除热键 h4U .wk  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) hM-qC|!  
{ v?}/WKe+0  
 BOOL bRemoved=FALSE; mYZH]oo  
 for(int index=0;index<MAX_KEY;index++){ oPi)#|jcb  
  if(hCallWnd[index]==hWnd){ Ty>`r n  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Wjp<(aY[  
    hCallWnd[index]=NULL; Mw< 1  
    HotKey[index]=0; CR<*<=rI  
    HotKeyMask[index]=0; 5}f$O  
    bRemoved=TRUE; 1K!7FiqY  
    KeyCount--; .d;/6HD[y  
    break; kC)dia{$  
   } Xo P]PR`cQ  
  } lw7wvZD  
 } 3=z'Ih`  
 return bRemoved; ,%u\2M  
} jd#{66:  
@E1N9S?>  
&" =inkh  
  DLL中的钩子函数如下: v+Hu=RZE  
6d,"GT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) f?)qZPM  
{ =^6]N~*,D  
 BOOL bProcessed=FALSE; /IgTmXxxj  
 if(HC_ACTION==nCode) ~&g:7f|X  
 { Zscmc;G  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 %"o4IYV#  
   switch(wParam) Mb-C DPT  
   {  tUzuel*  
    case VK_MENU: 3N?uY2  
     MaskBits&=~ALTBIT; #+XKfumLk  
     break; Yk }zN_v  
    case VK_CONTROL: I;=}@]9  
     MaskBits&=~CTRLBIT; Da.vyp  
     break; uu HWN|  
    case VK_SHIFT: 3?C$Tl2G8  
     MaskBits&=~SHIFTBIT; >LLFe~9`g  
     break; qr :[y  
    default: //judge the key and send message s:M:Ff  
     break; V XC_Y  
   } Oa{M9d,l  
   for(int index=0;index<MAX_KEY;index++){ ]^dXB 0  
    if(hCallWnd[index]==NULL) I\":L  
     continue; \;4RD$J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Xf:-K(%e  
    { bBGLf)fsTG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4!D!.t~r  
     bProcessed=TRUE; a &j H9  
    } {jbOcx$t  
   } Fq~de%y  
  } pDW .Pav  
  else if((lParam&0xc000ffff)==1){ //有键按下 VF;%Z  
   switch(wParam) +3VY0J  
   { j  $L  
    case VK_MENU: m%akx@{WL  
     MaskBits|=ALTBIT; 7z`)1^ M  
     break; {whR/rX`  
    case VK_CONTROL: ! @|"84  
     MaskBits|=CTRLBIT; K@+&5\y]  
     break; > QCVsX>~  
    case VK_SHIFT: 4W6gKY  
     MaskBits|=SHIFTBIT; :[! rj  
     break; r"^P>8  
    default: //judge the key and send message iX}EJD{f  
     break; Nq-qks.&  
   } od$Cm5  
   for(int index=0;index<MAX_KEY;index++){ I/t2c=f  
    if(hCallWnd[index]==NULL) ~|riFp=J  
     continue; 0&zp9(G5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) PE-Vx RN)  
    { -GQ`n01  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  $33wK  
     bProcessed=TRUE; wTqgH@rGtR  
    } x]w%?BlS  
   } *&!&Y*Jzg  
  } T2GJoJ!  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ONg_3vD{  
   for(int index=0;index<MAX_KEY;index++){ GkVV%0;&J1  
    if(hCallWnd[index]==NULL) (FP- K  
     continue; !M\8k$#"n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [8![UcMq  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); p%8y!^g  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ^C_ ;uz  
   } V4iN2  
  } WUZusW5s  
 } bDRl}^aO6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4; y*y tY*  
} J&2cf#  
p v%`aQ]o{  
  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: rM Un ~  
<t\!g  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w_PnEJa9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^_n(>$ EK  
"cj6i{x,~w  
  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: Dy mf  
ZDMS:w.'T  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $zKf>[K  
{ RX\%R  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6;Wns'  
 { b dP @^Q  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 a/ ^ojn  
  SaveBmp(); PF~w$ eeQ  
  return FALSE; Bz!SZpW(M  
 } Gg$4O8  
 …… //其它处理及默认处理 90X<Qs  
} J4"?D9T3G  
D.su^m_1  
R0HzNk  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 )T&ZiHIJ3  
2Jm#3zFYz3  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 E.45 s? r  
tFn_{fCc>  
  二、编程步骤 4zzJ5,S1  
lp+Uox  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; }fU"s"  
Lk#8G>U  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Qv~lH&jG  
e#BxlC  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 4c0 =\v  
{Dupk0'(  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; k nTCX  
C;>!SRCp  
  5、 添加代码,编译运行程序。 Z4KYVHD,  
{_C2c{  
三、程序代码 T uG%oV}   
> &tmdE  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL (.^KuXd  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) SI\ O>a 9{  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ <5BNcl\ZL  
#if _MSC_VER > 1000 > >%m,F[  
#pragma once %0&59q]LM  
#endif // _MSC_VER > 1000 J;wDvt]]1  
#ifndef __AFXWIN_H__ YMXhzqj  
#error include 'stdafx.h' before including this file for PCH E?v:7p<  
#endif S+2we  
#include "resource.h" // main symbols Bre:_>*  
class CHookApp : public CWinApp C( wZj O?N  
{ Bc&Y[u-n  
 public: x`n7D  
  CHookApp(); >= O5=\`  
  // Overrides (}*1,N!#  
  // ClassWizard generated virtual function overrides M$,4B  
  //{{AFX_VIRTUAL(CHookApp) AO[/-Uij  
 public: djmd @{Djt  
  virtual BOOL InitInstance(); (_IPz)F  
  virtual int ExitInstance(); o&-D[|E|  
  //}}AFX_VIRTUAL <!;NJLe`  
  //{{AFX_MSG(CHookApp) r?7tI0  
  // NOTE - the ClassWizard will add and remove member functions here. SJ*qgI?}T  
  // DO NOT EDIT what you see in these blocks of generated code ! \l-JU  
  //}}AFX_MSG ;T hn C>U  
  DECLARE_MESSAGE_MAP() B5v5D[ o5  
}; M,w5F5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); $/J4?Wik  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f0M5^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <*_DC)&7 9  
BOOL InitHotkey(); Iw;i ".  
BOOL UnInit(); Be;l!]i  
#endif Y+)qb);  
40=*Ul U-  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. *{x8@|K8  
#include "stdafx.h" tY@+d*u  
#include "hook.h" jEMnre3/  
#include <windowsx.h> ;suY  
#ifdef _DEBUG i4Da'Uk  
#define new DEBUG_NEW Fa0Fl}L  
#undef THIS_FILE uxx(WS  
static char THIS_FILE[] = __FILE__; !:2_y'hA  
#endif s+0n0C  
#define MAX_KEY 100 T|k_$LH  
#define CTRLBIT 0x04 Kt3T~k  
#define ALTBIT 0x02 {Ri6975  
#define SHIFTBIT 0x01 {c}n."`  
#pragma data_seg("shareddata") H"NBjVRU%  
HHOOK hHook =NULL; xcE2hK/+  
UINT nHookCount =0; M.qE$  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey T deHs{|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT #b,! N  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 'IQ;; [Q  
static int KeyCount =0; N1fPutl$a  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \%}w7J;  
#pragma data_seg() VPvQ]}g6k  
HINSTANCE hins; 0JE*|CtK  
void VerifyWindow(); ec h1{v\B|  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) `|p8zV  
//{{AFX_MSG_MAP(CHookApp) 0d/ f4  
// NOTE - the ClassWizard will add and remove mapping macros here. ak_n  
// DO NOT EDIT what you see in these blocks of generated code! 1EMrXnv,  
//}}AFX_MSG_MAP cC pNF `DN  
END_MESSAGE_MAP() h^v+d*R N  
E3V_qT8  
CHookApp::CHookApp() ^6@6BYf)  
{ ;iA$yw:  
 // TODO: add construction code here, n #PXMD*  
 // Place all significant initialization in InitInstance K |^OnM  
} p'4ZcCW?f  
|-9##0H  
CHookApp theApp; 9}T(m(WQVu  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }xJ!0<Bs  
{ @{@DGc  
 BOOL bProcessed=FALSE; 6 m%/3>q  
 if(HC_ACTION==nCode) *#.Ku(C+  
 { 9]gV#uF  
  if((lParam&0xc0000000)==0xc0000000){// Key up #X"fm1  
   switch(wParam) m$`4.>J  
   { .R^q$U~v3  
    case VK_MENU: t=IM"ZgfL  
     MaskBits&=~ALTBIT; 0ZJrK\K;  
     break; th|'t}bWV  
    case VK_CONTROL: &[t} /+)  
     MaskBits&=~CTRLBIT; )1/J5DI @8  
     break; _};T:GOT  
    case VK_SHIFT: jwp?eL!7  
     MaskBits&=~SHIFTBIT; Bq~?!~\?.  
     break; CqLAtS X7  
    default: //judge the key and send message awgS5We|  
     break; _iH:>2p5R  
   } =>*9"k%m  
   for(int index=0;index<MAX_KEY;index++){ LG vPy  
    if(hCallWnd[index]==NULL) ^f] 9^U{  
     continue; T5eJIc3a"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^S:I38gR#q  
    { LHMA-0$?)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u}-)ywX  
     bProcessed=TRUE; v*&WqVg  
    } Va$JfWef  
   } s+9b.  
  } "y-/ 9C  
  else if((lParam&0xc000ffff)==1){ //Key down Tffdm  
   switch(wParam) yK>s]65&  
   { b6^#{))"  
    case VK_MENU: mr+8[0  
     MaskBits|=ALTBIT; V!f' O@p[  
     break; COL_c<\  
    case VK_CONTROL: 42Cc`a%U  
     MaskBits|=CTRLBIT; }LwKi-G?  
     break; /Z2 g >  
    case VK_SHIFT: 2NF#mWZ(s  
     MaskBits|=SHIFTBIT; es1'z.UJ  
     break; ]#\/1!W  
    default: //judge the key and send message 3J[ 5^  
     break;  z:d+RMA  
   } &ER,;^H `6  
   for(int index=0;index<MAX_KEY;index++) l(3\ekU!  
   { l8 XY  
    if(hCallWnd[index]==NULL) CTZ#QiNP  
     continue; :@,UPc-+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ui&^ m,  
    { )QB9zl:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ogJ>`0 +J  
     bProcessed=TRUE; 72sBx3 ;  
    } t+aE*Q  
   } Fv3:J~Yf  
  } J5zu}U?  
  if(!bProcessed){ "v+%F  
   for(int index=0;index<MAX_KEY;index++){ O7xBMqMf  
    if(hCallWnd[index]==NULL) xL|4'8  
     continue; "uU[I,h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) GE#LcCa  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (RLJ_M|;/b  
   } ?>iZ){0,  
  } R ]y9>5 'U  
 } pbNW l/|4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); v]m#+E   
} QD^"cPC)mM  
t_iZ\_8  
BOOL InitHotkey() ~p$ncIr2Q  
{ W4S]2P>T  
 if(hHook!=NULL){ e:(~=9}Li  
  nHookCount++; U/:x<Y$ tj  
  return TRUE; A[N>T\  
 } 7WN$ rl5/  
 else vW03nt86  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); D,SL_*r{  
  if(hHook!=NULL) ?sbM=oo  
   nHookCount++; KDYyLkI dr  
  return (hHook!=NULL); fqZ+CzH  
} C/!8NV1:4  
BOOL UnInit() (=w ff5U  
{ V2*m/JyeB  
 if(nHookCount>1){ fZt3cE\  
  nHookCount--; &:Sb$+z  
  return TRUE; K9Bi2/N  
 } #*;Nb  
 BOOL unhooked = UnhookWindowsHookEx(hHook); /[Sy;wn  
 if(unhooked==TRUE){ UdX aC= Q  
  nHookCount=0; OuU]A[r  
  hHook=NULL; 'q*:+|"  
 } E']Gh  
 return unhooked; $:<G=  
} \:-N<[  
ATf{;S}  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (1}"I RX.  
{ -O>*` O>M  
 BOOL bAdded=FALSE; {y7,n  
 for(int index=0;index<MAX_KEY;index++){ ii]'XBSVd  
  if(hCallWnd[index]==0){ l|K`'YS!<{  
   hCallWnd[index]=hWnd; ZUUfn~ORc  
   HotKey[index]=cKey; {bPcr hB  
   HotKeyMask[index]=cMask; &Qq4xn+J  
   bAdded=TRUE; dIDs~  
   KeyCount++; T(6B,  
   break; 8Zvh"Z?  
  } t+B L O<  
 } -g)*v<Fb5  
 return bAdded; IP+1 :M  
} x_|:3I  
4r>buEU  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?u8 vK<2h  
{ 1Qgd^o:d  
 BOOL bRemoved=FALSE; 0-w^y<\  
 for(int index=0;index<MAX_KEY;index++){ ^Sz?c_<2P  
  if(hCallWnd[index]==hWnd){ M)!:o/!cS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ s\ i.pd:Q  
    hCallWnd[index]=NULL; Ue0Q| h  
    HotKey[index]=0; 7Om)uUjU4  
    HotKeyMask[index]=0; !;YQQ<D  
    bRemoved=TRUE; 2\=cv  
    KeyCount--; T+|V;nP.  
    break; 05m/iQ  
   } {cBLm/C  
  } G.c@4Wz+  
 } cP MUu9du  
 return bRemoved; UT7".1H  
} =m= utd8  
Gg9NG`e6I  
void VerifyWindow() 7<VfE`Q3  
{ =.Q|gZ   
 for(int i=0;i<MAX_KEY;i++){ zwKm;;v8  
  if(hCallWnd!=NULL){ "RJf2~(ZX  
   if(!IsWindow(hCallWnd)){ ))>)qav  
    hCallWnd=NULL; xj!_]XJ^w  
    HotKey=0; dSBW&-p  
    HotKeyMask=0; |d1%N'Ll  
    KeyCount--; ?OPAf4h  
   } e/h7x\Z  
  } ^6 sT$set  
 } U-EX)S^T[{  
} Epm=&6zf  
3fJwj}wL  
BOOL CHookApp::InitInstance() E5 0$y:  
{ }AfK=1yOa  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); N:@C% UW}  
 hins=AfxGetInstanceHandle(); E0*'AZi&  
 InitHotkey(); GcPhT  
 return CWinApp::InitInstance(); md/Z[du:'  
} uz+b  
p }bTI5  
int CHookApp::ExitInstance() cnOk  
{ wp,z~raaS  
 VerifyWindow(); :B'}#;8_  
 UnInit(); :{tvAdMl7  
 return CWinApp::ExitInstance(); l<$c.GgFd  
} V ;)q?ZHg  
:22IY> p  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file w{"GA ~=  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 1H_#5hd  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 9{bzxM  
#if _MSC_VER > 1000 :[N[D#/z  
#pragma once [y T4n.f  
#endif // _MSC_VER > 1000 bMD'teJ  
^9UF Pij"  
class CCaptureDlg : public CDialog HYPFe|t/  
{ pTK|u!fs  
 // Construction TPds)osZT  
 public: )Oz( <vxw  
  BOOL bTray; K5)G+Id*  
  BOOL bRegistered; t=]&q.  
  BOOL RegisterHotkey(); O/\jkF  
  UCHAR cKey; 2eu`X2IBcT  
  UCHAR cMask; soZw""|v  
  void DeleteIcon(); QW f)5S  
  void AddIcon(); Rh%/xG#k  
  UINT nCount; bkl'0 p  
  void SaveBmp(); _|Ml6;1aZ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor L&'0d$Tg8  
  // Dialog Data VmkYl$WZo  
  //{{AFX_DATA(CCaptureDlg) 6mBX{-Z[  
  enum { IDD = IDD_CAPTURE_DIALOG }; WU1o4&OF  
  CComboBox m_Key; K0\a+6kh  
  BOOL m_bControl; Wx/!My u  
  BOOL m_bAlt; WJU` g  
  BOOL m_bShift; j#U?'g  
  CString m_Path; Y(SgfWeK@1  
  CString m_Number; c+G: bb%p  
  //}}AFX_DATA 685o1c|  
  // ClassWizard generated virtual function overrides 38Z"9  
  //{{AFX_VIRTUAL(CCaptureDlg) =3oz74O[  
 public: 7-ba-[t#A  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 9VN@M  
 protected: h ;5 -X7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +c\s%Gzrh  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); vd /_`l.D  
  //}}AFX_VIRTUAL KX)xCR~  
  // Implementation 4W.;p"S2  
 protected: 3_T'TzQ u  
  HICON m_hIcon; RQU5T 2,  
  // Generated message map functions Z=!*7@QY  
  //{{AFX_MSG(CCaptureDlg) &U xN.vl  
  virtual BOOL OnInitDialog(); [NvEX Td  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); B:z-?u#B  
  afx_msg void OnPaint(); =,[46 ;q  
  afx_msg HCURSOR OnQueryDragIcon(); 4 _N)1u !  
  virtual void OnCancel(); i&>,aiH@  
  afx_msg void OnAbout(); gH\r# wy|  
  afx_msg void OnBrowse(); 0 \LkJ*i  
  afx_msg void OnChange(); =pcj{B{qa  
 //}}AFX_MSG >Fld7;L?<  
 DECLARE_MESSAGE_MAP() Mn~A;=%qF  
}; !nj%n  
#endif 0v0Y( Mo@  
vEzzdDwi6  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file jD^L<  
#include "stdafx.h" 9v cUo?/  
#include "Capture.h" XU9=@y+|v  
#include "CaptureDlg.h" \Zf&&7v  
#include <windowsx.h> Ip4NkUI3T  
#pragma comment(lib,"hook.lib") sp**Sg)  
#ifdef _DEBUG g@Ni!U"_c  
#define new DEBUG_NEW /"CKVQ  
#undef THIS_FILE HxY,R ^  
static char THIS_FILE[] = __FILE__; h0.Fstf]  
#endif ;6b#I$-J-  
#define IDM_SHELL WM_USER+1 @gi Y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); a LmVOL{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ? 3}UO:B  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Xe+&/J5b  
class CAboutDlg : public CDialog d;<n [)@  
{ G<jpJ  
 public: U-FA^c;  
  CAboutDlg(); 6@XutciK  
  // Dialog Data pXFNK" jm  
  //{{AFX_DATA(CAboutDlg) kw-/h+lG  
  enum { IDD = IDD_ABOUTBOX }; DQlaSk4hF_  
  //}}AFX_DATA b7AuKY{L  
  // ClassWizard generated virtual function overrides uaPBM<  
  //{{AFX_VIRTUAL(CAboutDlg) Msd!4TrBJ  
 protected: Km <Wh=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support X^|oY]D  
  //}}AFX_VIRTUAL zK-hNDFL{  
  // Implementation (uG4W|?p  
 protected: 0='DDy  
  //{{AFX_MSG(CAboutDlg) : l>Ue&  
  //}}AFX_MSG @>9p2u)=  
  DECLARE_MESSAGE_MAP() TLSy+x_gX  
}; (FjgnsW  
u\e#_*>  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) j^%i?BWw  
{ btOTDqG`a  
 //{{AFX_DATA_INIT(CAboutDlg) =H,cwSE+%  
 //}}AFX_DATA_INIT !7xp<=  
} CMBW]b|  
<go~WpA|r  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) qz0v1057#  
{ 4[J3HLQ  
 CDialog::DoDataExchange(pDX); z}Z`kq+C  
 //{{AFX_DATA_MAP(CAboutDlg) 7lVIN&.=  
 //}}AFX_DATA_MAP 68HX,t  
} {-Y_8@&  
34oL l#q*  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) bg HaheU  
 //{{AFX_MSG_MAP(CAboutDlg) KFZ[gqW8YY  
 // No message handlers QhGg^h%6  
 //}}AFX_MSG_MAP Rm*}<JN31  
END_MESSAGE_MAP() y2+a2  
=O;SXzgE  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) jVA~]a  
: CDialog(CCaptureDlg::IDD, pParent) jYy0^)6X(  
{ _"sRL} -Z  
 //{{AFX_DATA_INIT(CCaptureDlg) w@: ]]R  
  m_bControl = FALSE; &1h3o^K  
  m_bAlt = FALSE; dJLJh*=AG  
  m_bShift = FALSE; sd[QtK^  
  m_Path = _T("c:\\"); R82Y&s;  
  m_Number = _T("0 picture captured."); y:A0!75  
  nCount=0; fiZv+R<x1  
  bRegistered=FALSE; okcl-q  
  bTray=FALSE; 2 YN` :"  
 //}}AFX_DATA_INIT FvJSJ.;E,  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 GBphab|  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); llleo8  
} k_a'a)`$6  
ob00(?;H  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) .u*].As=  
{ 'u3+k.  
 CDialog::DoDataExchange(pDX); ? w?k-v  
 //{{AFX_DATA_MAP(CCaptureDlg) `{wku@  
  DDX_Control(pDX, IDC_KEY, m_Key); ;yZ N "r  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); +E [bLz^  
  DDX_Check(pDX, IDC_ALT, m_bAlt); *(`.h\+  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); %f-<ol  
  DDX_Text(pDX, IDC_PATH, m_Path); $dnHUBB  
  DDX_Text(pDX, IDC_NUMBER, m_Number); &!a 2%%1#N  
 //}}AFX_DATA_MAP lBn*G&(P  
} iTt=aQjd  
5HbTgNI  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Eo Urc9G2  
//{{AFX_MSG_MAP(CCaptureDlg) <!N;(nZ9}O  
 ON_WM_SYSCOMMAND() z}8YrVr@  
 ON_WM_PAINT() j?,*fp8  
 ON_WM_QUERYDRAGICON() A pjqSz"  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 7[H`;l  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) YxtkI:C?  
 ON_BN_CLICKED(ID_CHANGE, OnChange) {^f0RGJg9  
//}}AFX_MSG_MAP >Y+KL  
END_MESSAGE_MAP() D9C}Dys  
Cv~hU%1T  
BOOL CCaptureDlg::OnInitDialog() ziycyf.d  
{ 1hviT&  
 CDialog::OnInitDialog(); VjqdKQeVq  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); S1zw'!O5  
 ASSERT(IDM_ABOUTBOX < 0xF000); 4sj%:  
 CMenu* pSysMenu = GetSystemMenu(FALSE); nwo!A3w:  
 if (pSysMenu != NULL) IA^)`l7H  
 { I.u,f:Fl'  
  CString strAboutMenu; |+:ZO5FaO  
  strAboutMenu.LoadString(IDS_ABOUTBOX); D%idlL2%J  
  if (!strAboutMenu.IsEmpty()) >>bYg  
  { oPy zk7{  
   pSysMenu->AppendMenu(MF_SEPARATOR); ]R{"=H'  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); +2}(]J=-  
  } ,&?q}M  
 } | q16%6q  
 SetIcon(m_hIcon, TRUE); // Set big icon \z`d}\3( R  
 SetIcon(m_hIcon, FALSE); // Set small icon b(q&}60  
 m_Key.SetCurSel(0); J\so8uT:  
 RegisterHotkey(); qE72(#:R*  
 CMenu* pMenu=GetSystemMenu(FALSE); -HsBV>C  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); t4k'9Y:\Q  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); <PN;D#2bh  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); />[6uvy#Q  
 return TRUE; // return TRUE unless you set the focus to a control 4)iEj  
} <e&QTyb  
aTh%oBrtP  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) s~$4bN>LD  
{ k6-n.Rl01  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) mF}k}0  
 { Zax]i,Bx  
  CAboutDlg dlgAbout; -b)zira  
  dlgAbout.DoModal(); ,:(leWeA9  
 } E@jl: -*E  
 else NoAb}1uae  
 { MJ9SsC1  
  CDialog::OnSysCommand(nID, lParam); jN} 7Bb X  
 } ^X;Xti  
} ~fp+@j-A  
3t8H?B12ow  
void CCaptureDlg::OnPaint() -fx88  
{ O|&TL9:  
 if (IsIconic()) YaZt+WA  
 { (I[h.\%  
  CPaintDC dc(this); // device context for painting TcLaWf!c5  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); H8BO*8}  
  // Center icon in client rectangle 7oe@bS/Z  
  int cxIcon = GetSystemMetrics(SM_CXICON); M y"!j,Up  
  int cyIcon = GetSystemMetrics(SM_CYICON); C9g~l}=$&  
  CRect rect; 0^&R7Rv c  
  GetClientRect(&rect); xnQGCw?S&}  
  int x = (rect.Width() - cxIcon + 1) / 2; O 4Pd N?  
  int y = (rect.Height() - cyIcon + 1) / 2; :_\!t45  
  // Draw the icon '+I 2$xE  
  dc.DrawIcon(x, y, m_hIcon); K}=8:BaUL  
 } UVCMB_T  
 else .&Pe7`.BE  
 { i5<Va@ru!s  
  CDialog::OnPaint(); Wx|6A#cg!  
 } ~`>26BWQz  
} :z} _y&]  
~<aeA'>OA  
HCURSOR CCaptureDlg::OnQueryDragIcon() HjK<)q8b  
{ +Q!xEfpO;  
 return (HCURSOR) m_hIcon; SxW}Z_8x  
} p@8^gc  
]t*P5  
void CCaptureDlg::OnCancel() FV6he [,  
{ 7k t7^V<  
 if(bTray) =E}%>un  
  DeleteIcon(); `{|}LFS>  
  CDialog::OnCancel(); &Y>~^$`J  
} \m~\,em  
v6P~XK}G  
void CCaptureDlg::OnAbout() R`C_CsXir  
{ W8yfa[z~J  
 CAboutDlg dlg; ;Q>3N(  
 dlg.DoModal(); wz0$g4  
} fpK0MS]=b  
"p~]m~g  
void CCaptureDlg::OnBrowse() B mBzOk^  
{ /yw\(|T  
 CString str; 8@W/43K8-  
 BROWSEINFO bi; `^bvj]>l  
 char name[MAX_PATH]; [OoH5dD  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); c7l!G~yx'  
 bi.hwndOwner=GetSafeHwnd(); K?Xo3W%K  
 bi.pszDisplayName=name; 1[/$ZYk:  
 bi.lpszTitle="Select folder"; d[RWkk5  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; n|mJE,N  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); >H1|c%w  
 if(idl==NULL) .f !]@"\  
  return; 7z&adkG:  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 'q};L6  
 str.ReleaseBuffer(); F%_,]^ n[  
 m_Path=str; 3n84YX{  
 if(str.GetAt(str.GetLength()-1)!='\\') zsMw5C  
  m_Path+="\\"; Fy _<Ui  
 UpdateData(FALSE); p[@oF5M  
} _czbUl  
O^R:_vb3I  
void CCaptureDlg::SaveBmp() gKs/T'PW  
{ Zn<(,e  
 CDC dc; Gx h~  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 4j@kMe;RjZ  
 CBitmap bm; yS uLt@X  
 int Width=GetSystemMetrics(SM_CXSCREEN); V:F+HMBk  
 int Height=GetSystemMetrics(SM_CYSCREEN); Ef_F#X0#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); L=$?q/=-  
 CDC tdc; 93^(O8.  
 tdc.CreateCompatibleDC(&dc); Hc&uE3=%sL  
 CBitmap*pOld=tdc.SelectObject(&bm); S QM(8*:X  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); <(bCz>o|  
 tdc.SelectObject(pOld); R%)2(\  
 BITMAP btm; RlslF9f  
 bm.GetBitmap(&btm); j""y2c1  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; .,ppGc| *  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); LG Y!j_bD  
 BITMAPINFOHEADER bih; _8x'GK tU  
 bih.biBitCount=btm.bmBitsPixel; ;vI*ThzdD  
 bih.biClrImportant=0; m[@%{  
 bih.biClrUsed=0; +J o 3rX'`  
 bih.biCompression=0; Vyq#p9Q  
 bih.biHeight=btm.bmHeight; -lP )  
 bih.biPlanes=1; rAlh& ?X  
 bih.biSize=sizeof(BITMAPINFOHEADER); {7K'<ti  
 bih.biSizeImage=size; oc3dd"8}@  
 bih.biWidth=btm.bmWidth; l6 S19Kv  
 bih.biXPelsPerMeter=0; *< $c =  
 bih.biYPelsPerMeter=0; w]W`R.  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); PzMlua  
 static int filecount=0; u8<&F`7j  
 CString name; DYT@BiW{  
 name.Format("pict%04d.bmp",filecount++); yBPt%EF  
 name=m_Path+name; }rKJeOo^x?  
 BITMAPFILEHEADER bfh; ,#P,B ;r~  
 bfh.bfReserved1=bfh.bfReserved2=0; &Hlm{FHU  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 7z/(V\9B  
 bfh.bfSize=54+size; +(=0CA0GE  
 bfh.bfOffBits=54; Qc&-\kQ:$u  
 CFile bf; SLQ\Y%F  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ SG dfhno;  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); aDN6MZM  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); B@"SOX  
  bf.WriteHuge(lpData,size); kW<Yda<a  
  bf.Close(); pBg|n=^  
  nCount++; b"R, p=M  
 } 8 l'bRyuS  
 GlobalFreePtr(lpData); >bX-!<S  
 if(nCount==1) b(.-~c('  
  m_Number.Format("%d picture captured.",nCount); Xr@l+zr  
 else ih+*T1#:(  
  m_Number.Format("%d pictures captured.",nCount); IFd )OZ5  
  UpdateData(FALSE); Xq8uY/j  
}  !fQJL   
 .6O52E  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) H )BOSZD  
{ ), nCq^Bp  
 if(pMsg -> message == WM_KEYDOWN) iA55yT+  
 { &\J?[>EJ.  
  if(pMsg -> wParam == VK_ESCAPE) V-D}U$fw  
   return TRUE; Sk6b`W7$  
  if(pMsg -> wParam == VK_RETURN) {h/OnBwG  
   return TRUE; %XEKhy  
 } 0On? {Bw  
 return CDialog::PreTranslateMessage(pMsg); !G)mjvEe  
} /~o7Q$)-b  
`y8 ?=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8 3z'#  
{ :X'*8,]KHH  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ z +3<$Z  
  SaveBmp(); LJRg>8  
  return FALSE; 5y1or  
} kq)+@p  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 1s{ISWm  
 CMenu pop; D~G5]M,}$  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ]}mly` Fw  
 CMenu*pMenu=pop.GetSubMenu(0); d\~p5_5.  
 pMenu->SetDefaultItem(ID_EXITICON); L.C ^E7;Z_  
 CPoint pt; U}tl_5%)  
 GetCursorPos(&pt); x4CtSGG85f  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); BA~a?"HS  
 if(id==ID_EXITICON) T"L0Iy!k;  
  DeleteIcon(); CCbkxHMf|!  
 else if(id==ID_EXIT) .dD9&n;#^  
  OnCancel(); B<|:K\MA  
 return FALSE; .ocx(_3G  
} XIr{U5$<6  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 2Pbe~[  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Q)x?B]b-  
 AddIcon(); w{k1Y+1  
 return res; RL?u n}Qa  
} u] F7 0C^~  
Ni+3b  
void CCaptureDlg::AddIcon() I#"t'=9H  
{ L8K0^~Mk  
 NOTIFYICONDATA data; iP<k1#k  
 data.cbSize=sizeof(NOTIFYICONDATA); BQyvj\uJ  
 CString tip; j y7  
 tip.LoadString(IDS_ICONTIP); 'M~BE\  
 data.hIcon=GetIcon(0); 6OfdD.y  
 data.hWnd=GetSafeHwnd(); t9G}Yd[T  
 strcpy(data.szTip,tip); kP7a:(P_g  
 data.uCallbackMessage=IDM_SHELL; 7cIC&(h5  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; i LF^%!:X%  
 data.uID=98; k4S} #!  
 Shell_NotifyIcon(NIM_ADD,&data); l% rx#;=u  
 ShowWindow(SW_HIDE); cqeR<len  
 bTray=TRUE; uz]E_&2  
} :|Z$3q  
R;H?gE^m-  
void CCaptureDlg::DeleteIcon() 1a<]$tZk  
{ aRbx   
 NOTIFYICONDATA data; lkV6qIj   
 data.cbSize=sizeof(NOTIFYICONDATA); "e~k-\^Y  
 data.hWnd=GetSafeHwnd(); S3SV.C:z>  
 data.uID=98; 'I&|1I^  
 Shell_NotifyIcon(NIM_DELETE,&data); ,`;jvY~Ec  
 ShowWindow(SW_SHOW); ./#e1m?.  
 SetForegroundWindow(); 'dkXYtKCB  
 ShowWindow(SW_SHOWNORMAL); uA~YRKer  
 bTray=FALSE; >R(8/#|E  
} }ppVR$7]0  
CV s8s  
void CCaptureDlg::OnChange() *Wzwbwg  
{ h2"9"*S1  
 RegisterHotkey(); -g:lOht  
} 'nMApPl  
A^pu  
BOOL CCaptureDlg::RegisterHotkey() p?;-!TUv  
{ ;_iPm?Y8  
 UpdateData(); CE{z-_{ ^  
 UCHAR mask=0; D,k(~  
 UCHAR key=0; WElrk:b  
 if(m_bControl) 4_tR9w"  
  mask|=4; g]za"U|g  
 if(m_bAlt) 0Qm"n6NQ  
  mask|=2; K>kLUcC7Z  
 if(m_bShift) _WKJ<dB<  
  mask|=1; !/947Rn  
  key=Key_Table[m_Key.GetCurSel()]; DMB"Y,  
 if(bRegistered){ xS"$g9o0  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); .AXdo'&2i  
  bRegistered=FALSE; [(1O"  
 } UV4u.7y  
 cMask=mask; kGm:VYf%  
 cKey=key; ;;@IfZ ?j  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); l<TIG3 bs  
 return bRegistered; K'NcTw#f  
} aM), M]m[  
W}>=JoN^J  
  四、小结 i`+B4I8[  
Gfv(w=rr?  
  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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