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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: sEi.f(WA  
  FJH8O7  
  一、实现方法 Y`p&*O  
] Lft^,7  
  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: y/*Tvb #TJ  
=@/^1.`  
#pragma data_seg("shareddata") [*E.G~IS`  
HHOOK hHook =NULL; //钩子句柄 wbKBwI5w  
UINT nHookCount =0; //挂接的程序数目 !x / Z"  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Pb&+(j  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Jy NY *  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey &IY_z0=  
static int KeyCount =0; -.3k vL  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 exU=!3Ji  
#pragma data_seg() otVdx&%]  
8pt<)Rs}  
  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。 FQRcZpv;  
nk.E q[08  
  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: f3B8,>  
4T\/wyq0  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ^u&Khc~ y  
cKey,UCHAR cMask) WC;a  
{ k"-#ox!  
 BOOL bAdded=FALSE; eC:Q)%$%l  
 for(int index=0;index<MAX_KEY;index++){ iz5wUyeg  
  if(hCallWnd[index]==0){ $d[:4h~  
   hCallWnd[index]=hWnd; B>2 1A9&  
   HotKey[index]=cKey; `r$WInsDu  
   HotKeyMask[index]=cMask; UoT}m^ G  
   bAdded=TRUE; ITPp T  
   KeyCount++; JNCtsfd  
   break; w:(7fu=  
  } ExU|EN-  
 } 8ngf(#_{_n  
 return bAdded; vK~KeZ\,p=  
} 4?uG> ;V  
//删除热键 UwT$IKR  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [`dipLkr  
{ YhR"_  
 BOOL bRemoved=FALSE; '0rwNEg  
 for(int index=0;index<MAX_KEY;index++){ -{mq\GvGn  
  if(hCallWnd[index]==hWnd){ nit7|T@^  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *dgN pJ 9  
    hCallWnd[index]=NULL; !Hj)S](F  
    HotKey[index]=0; l[{}ZKZ  
    HotKeyMask[index]=0; bncFrzp#o  
    bRemoved=TRUE; ="E V@H?U  
    KeyCount--; (ZsR=:9(  
    break; 1<e%)? G  
   } >7Q7H#~w  
  } %*}f<k{6  
 } <7) 6*u  
 return bRemoved; Lxrn#Z eM  
} >?FCv7qN  
8 z7,W3b  
P#oV ^  
  DLL中的钩子函数如下: $o H,:x?}  
@b({QM|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Q(7l<z  
{ _3>zi.J/  
 BOOL bProcessed=FALSE; zjE4v-H:l  
 if(HC_ACTION==nCode) =LA@E&,j  
 { #E)]7!_XG  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 3&:fS|L~c  
   switch(wParam) qRLypm  
   {  oPZ4}>uV  
    case VK_MENU: y Dw!u[:  
     MaskBits&=~ALTBIT; sR nMBW.  
     break; X.|0E87  
    case VK_CONTROL: $4,6&dwg  
     MaskBits&=~CTRLBIT; OUMr}~/  
     break; l))IO`s=_  
    case VK_SHIFT: 63$m& ]x  
     MaskBits&=~SHIFTBIT; essW,2,rjC  
     break; ;Bi{;>3  
    default: //judge the key and send message G"w Q(6J@  
     break; O,#[m:Ejb  
   } !%9I%Ak^  
   for(int index=0;index<MAX_KEY;index++){ DJUtuex  
    if(hCallWnd[index]==NULL) \(L^ /]}G)  
     continue; LXl! !i%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9B0"GEwrs  
    { [hbIv   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); pQ8+T|0x  
     bProcessed=TRUE; GrC")Z|3u  
    } 7C^ nk z  
   } OSk9Eb4ld  
  } h (2k;M^s  
  else if((lParam&0xc000ffff)==1){ //有键按下 gp2)35  
   switch(wParam) {*Pp^ r  
   { JnJz{(c  
    case VK_MENU: KYN{iaj  
     MaskBits|=ALTBIT; }FVX5/.'  
     break; ObzlZP r@  
    case VK_CONTROL: ry"zec B  
     MaskBits|=CTRLBIT; (7,Awf5D~  
     break; wYG0*!Vj  
    case VK_SHIFT: \>k+Oyj  
     MaskBits|=SHIFTBIT; 7 i/Cax  
     break; c @R6p+  
    default: //judge the key and send message 9f`Pi:*+/  
     break; w.H+$=aK  
   } -}o;Y)  
   for(int index=0;index<MAX_KEY;index++){ =ndKG5  
    if(hCallWnd[index]==NULL) ak [)+_k_  
     continue; @( l`_Wx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?f&I"\y  
    { :~Y$\Ww(~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); R3A^VE;qP  
     bProcessed=TRUE; XT"c7]X  
    } Gy%e%'  
   } 1O4"MeF  
  } 0 HmRl  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Q2Rj0E`  
   for(int index=0;index<MAX_KEY;index++){ (P-<9y@  
    if(hCallWnd[index]==NULL) zdE^v{}|  
     continue; /+msrrpD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |e\%pfZ   
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Lw`\J|%p  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ej+!|97M  
   } 3I+pe;  
  } C+5nft6:  
 } `Fj(g!`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); J^4k}  
} 2wCRT}C  
8n?.w:Y/  
  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: tw66XxE  
HJmO+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [eRMlSXA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ay]5GA!W+  
iY-dM(_:]  
  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: >Fz$DKr[  
HV@:!zM  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {QID@  
{ nKdLhCN'=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Q1z04m1_y[  
 { yhaYlYv[_3  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 c+=&5=i[3  
  SaveBmp(); WmA578|l!  
  return FALSE; <X?F :?Mk  
 } }JD(e}8$!  
 …… //其它处理及默认处理 Npqbxb  
} %:*HzYf  
,"o \_{<z  
H^G*5EQK  
  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。 I?QKd@  
K@m^QioMj  
  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。 N"TD$NrK\  
'#PT C,0UJ  
  二、编程步骤 uZ+<  
zlfm})+G  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 1*fA>v  
RulIzv  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; (yfTkBy  
q<VhP2R  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; (P?9Jct  
`;;!>rm  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; - g0>>{M'  
i(WWF#N 5  
  5、 添加代码,编译运行程序。 2xX7dl(cC  
7F.,Xvw&@  
三、程序代码 art{PV4-  
/03>|Juo  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL r`2& o  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) \ (,2^T'$J  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ H< j+-u4b  
#if _MSC_VER > 1000 t(Uoi~#[  
#pragma once #XsqTK_nk  
#endif // _MSC_VER > 1000 9L};vkYk#  
#ifndef __AFXWIN_H__ |NI0zd  
#error include 'stdafx.h' before including this file for PCH ?@_dx=su  
#endif rfjQx]3pB  
#include "resource.h" // main symbols V;"'!dVX  
class CHookApp : public CWinApp nFqMS|EN  
{ LdOB[W  
 public: Dng^4VRd  
  CHookApp(); >qE$:V "_5  
  // Overrides GOt@x9%  
  // ClassWizard generated virtual function overrides /?sV\shy  
  //{{AFX_VIRTUAL(CHookApp) [# :k3aFz  
 public: Ev%\YI!MaY  
  virtual BOOL InitInstance(); F<$&G'% H  
  virtual int ExitInstance(); am}zOr\  
  //}}AFX_VIRTUAL F}X_I  
  //{{AFX_MSG(CHookApp) P1t5-q  
  // NOTE - the ClassWizard will add and remove member functions here. '&9b*u";x(  
  // DO NOT EDIT what you see in these blocks of generated code ! wQ5__"D  
  //}}AFX_MSG yC[}gHv  
  DECLARE_MESSAGE_MAP() %9j]N$.V  
}; Nx99dr  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 6 Qmtb2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  Dg@6o  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); LE;c+(CAU  
BOOL InitHotkey(); "jSn`  
BOOL UnInit(); FB@G.f  
#endif 7$'ja  
/vu7;xVG  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. _xJ&p$&  
#include "stdafx.h" PF.HYtZqK  
#include "hook.h" "ggq7cJ}_  
#include <windowsx.h> fRiHs\+  
#ifdef _DEBUG Rh=h{O  
#define new DEBUG_NEW Vh&uSi1V  
#undef THIS_FILE >(3 y(1;  
static char THIS_FILE[] = __FILE__; .FeEK(  
#endif W+QI D/  
#define MAX_KEY 100 DD1S]m  
#define CTRLBIT 0x04 {0?76|  
#define ALTBIT 0x02 9I,Trk@&  
#define SHIFTBIT 0x01 V{][{5SR  
#pragma data_seg("shareddata") j'Fni4;  
HHOOK hHook =NULL; ^dro*a,  
UINT nHookCount =0; K&/W cuP &  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey b{A#P?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT <*L8kNykK  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey EB \\ F  
static int KeyCount =0; sS._N@f  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift s^cHR1^  
#pragma data_seg() 139_\=5|U/  
HINSTANCE hins; JH 8^ZP:d'  
void VerifyWindow(); E11"uWk`  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 37VSE@Z+  
//{{AFX_MSG_MAP(CHookApp) .k}h'nE  
// NOTE - the ClassWizard will add and remove mapping macros here. )/UkJ/}j  
// DO NOT EDIT what you see in these blocks of generated code! 0VPa=AW  
//}}AFX_MSG_MAP d2pVO]l YZ  
END_MESSAGE_MAP() ZPXxrmq%  
v''$qMQ)  
CHookApp::CHookApp() MZ0 J/@(  
{ ,ecFHkT>  
 // TODO: add construction code here, 'Ag?#vB  
 // Place all significant initialization in InitInstance G=DRz F  
} 8IO4>CMkv  
"_lSw3  
CHookApp theApp; ?Pa5skqR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "bJWyUb  
{ ./u3z|q1  
 BOOL bProcessed=FALSE;  0y?bwxkc  
 if(HC_ACTION==nCode) uKK+V6}!kj  
 { *t63c.S  
  if((lParam&0xc0000000)==0xc0000000){// Key up Wa wOap  
   switch(wParam) Ls( &.  
   { YM-,L-HMA  
    case VK_MENU: -Wf 2m6t  
     MaskBits&=~ALTBIT; aPRF  
     break; d+8Sypv^4*  
    case VK_CONTROL: zhS\|tI  
     MaskBits&=~CTRLBIT; o]@?QAu  
     break; LqNsQu";  
    case VK_SHIFT: |(]XZ!{  
     MaskBits&=~SHIFTBIT; 5~v({R.  
     break; `rvS(p[s  
    default: //judge the key and send message {q:6;yzxl  
     break; uZCPxog  
   } L+&$/1h]  
   for(int index=0;index<MAX_KEY;index++){ ?e0ljx;  
    if(hCallWnd[index]==NULL) F&^u1RYz  
     continue; vLq_l4l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ol-U%J  
    { G#UO>i0jy  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *~cq (PFQ  
     bProcessed=TRUE; QN":Qk(,q  
    } r+>gIX+Fl  
   } m)V%l0  
  } ^I7iEv  
  else if((lParam&0xc000ffff)==1){ //Key down dj 4:r!5_  
   switch(wParam) 29:] cL(5  
   { 5LR k)@t  
    case VK_MENU: umI@ej+D  
     MaskBits|=ALTBIT; u{J$]%C   
     break; F8nR.|  
    case VK_CONTROL: *y0TtEd;  
     MaskBits|=CTRLBIT; &=~Jw5WK  
     break; f-^JI*hj  
    case VK_SHIFT: #mFIZMTRd  
     MaskBits|=SHIFTBIT; J.$N<.  
     break; EjrK.|I0  
    default: //judge the key and send message W|4:3 c4  
     break; R10R,*6>  
   } ;O+= 6>W  
   for(int index=0;index<MAX_KEY;index++) nH_M#  
   { )1N~-VuT  
    if(hCallWnd[index]==NULL) ;ry~x:7L7  
     continue; Pd)mLs Jg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3VaL%+T$,  
    { 3%P<F>6 J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); {{qu:(_g  
     bProcessed=TRUE; G0)}?5L1J  
    } s^#B*  
   } Qhy!:\&1  
  } 5<YV`T{5Kl  
  if(!bProcessed){ yvv]iRk<  
   for(int index=0;index<MAX_KEY;index++){ O |!cPB:  
    if(hCallWnd[index]==NULL) k..AP<hH  
     continue; {OIB/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =bgWUu\F  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #Pt_<?JtV  
   } qz95)  
  } 0~4Ww=#  
 } E6XDn`:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \xG_q>1_  
} LGB}:;$AL  
6+!$x?5|NP  
BOOL InitHotkey() -!q^/ux  
{ - ({h @  
 if(hHook!=NULL){ !y+uQ_IS@  
  nHookCount++; x n?$@  
  return TRUE; 4( $p8J  
 } MQ#k`b#()  
 else 2)hfYLi  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Y O&@  
  if(hHook!=NULL) pmRm&VgE.  
   nHookCount++; KrdEB0qh  
  return (hHook!=NULL); GHY+q{'#V_  
} agt/;>q\~  
BOOL UnInit() Hsn'"  
{ L>LIN 1A  
 if(nHookCount>1){ iYD5~pK8  
  nHookCount--; sKCYGt$  
  return TRUE; <p/zm}?')  
 } DG?g~{Y~b  
 BOOL unhooked = UnhookWindowsHookEx(hHook); t'1g+g  
 if(unhooked==TRUE){ bFjH* ~ P  
  nHookCount=0; pu~b\&^G  
  hHook=NULL; ,oykOda:|  
 } (@->AJF1\  
 return unhooked; I3HO><o f  
} )pSA|Qt N  
t W+"/<U  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \HXq~Y  
{ zZ6m`]{B9?  
 BOOL bAdded=FALSE; 4_kY^"*#"  
 for(int index=0;index<MAX_KEY;index++){ Dj>eAO>  
  if(hCallWnd[index]==0){ djH&)&q!  
   hCallWnd[index]=hWnd; }y Vx"e)  
   HotKey[index]=cKey; :_}xN!9LA  
   HotKeyMask[index]=cMask; kDol1v`  
   bAdded=TRUE; E;}&2 a  
   KeyCount++; 4%2APvLW  
   break; ,Qx]_gZ`  
  } 9#TD1B/  
 } @R%* ;)*F  
 return bAdded; tn#cVB3  
} fLnwA|n=  
O}>@G  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |.VSw  
{ ^s6}[LDW>@  
 BOOL bRemoved=FALSE; }4N'as/ZO  
 for(int index=0;index<MAX_KEY;index++){ @Ddz|4vEi  
  if(hCallWnd[index]==hWnd){ "4\k1H"_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^D<CoxG  
    hCallWnd[index]=NULL; L&c & <+0T  
    HotKey[index]=0; :.4O Hp1  
    HotKeyMask[index]=0; T%% 0W J  
    bRemoved=TRUE; 9dq"x[  
    KeyCount--; }4p)UX>aWT  
    break; Li]bU   
   } b"WF]x|^  
  } b"uO BB  
 } n&Ckfo_D  
 return bRemoved; f`:GjA,J$  
} -w*fS,O  
PChew3  
void VerifyWindow() C7ug\_,s  
{ D%~tU70a  
 for(int i=0;i<MAX_KEY;i++){ {.542}A  
  if(hCallWnd!=NULL){ 1~ W@[D  
   if(!IsWindow(hCallWnd)){ bn )1G$0|  
    hCallWnd=NULL; k:I,$"y4  
    HotKey=0; OHi.5 (  
    HotKeyMask=0; tPl 4'tW_  
    KeyCount--; Kf1J;*i|\  
   } +l^tT&s;f  
  } 5CZyA`3V^5  
 } ele@xl  
} <Xl#}6II  
4^uSW&`;/  
BOOL CHookApp::InitInstance() E{EO9EI  
{ KJRAW]?{  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); & ?xR  
 hins=AfxGetInstanceHandle(); Wk\(jaL%  
 InitHotkey(); GA[Ebzi  
 return CWinApp::InitInstance(); ydyTDn  
} g]lEG>y1R  
p;>A:i  
int CHookApp::ExitInstance() O`c+y  
{ RI@\cJ\}  
 VerifyWindow(); T/\RViG3  
 UnInit(); y QClq{A  
 return CWinApp::ExitInstance(); x>}ml\R  
} =nHKTB>  
(B>/LsTu  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 'g!T${  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) #h?I oB7  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ q)i %*IY  
#if _MSC_VER > 1000 U3X5tED  
#pragma once T[Zs{S  
#endif // _MSC_VER > 1000 :ZM9lBYh  
uX*2Rs$s  
class CCaptureDlg : public CDialog 4~,Z 'k  
{ d #1Y^3n  
 // Construction H"FK(N\  
 public: *{3d+j/?/  
  BOOL bTray; l::q F 0  
  BOOL bRegistered; QQBh)5F  
  BOOL RegisterHotkey(); QkBw59L7  
  UCHAR cKey; E +_n@t"  
  UCHAR cMask; <%m YsaM  
  void DeleteIcon(); +b(};(wL  
  void AddIcon(); i'm<{ v  
  UINT nCount; 5Jbwl$mZ  
  void SaveBmp(); +P^ ;7"H  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor #7 3pryXV  
  // Dialog Data {1)A"lQu  
  //{{AFX_DATA(CCaptureDlg) w}gmVJ#p  
  enum { IDD = IDD_CAPTURE_DIALOG }; `Gqe]ZE#"  
  CComboBox m_Key; pcy;]U ?  
  BOOL m_bControl; <{isWEW9]3  
  BOOL m_bAlt; jc&k-d>=G  
  BOOL m_bShift; kJJT`Ba&/  
  CString m_Path; au{) 5W4~  
  CString m_Number; 5dm~yQN/  
  //}}AFX_DATA SXk.7bMV6  
  // ClassWizard generated virtual function overrides k ucbI_  
  //{{AFX_VIRTUAL(CCaptureDlg) x~V[}4E%>  
 public: 3PE.7-HF  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 4yxQq7 m,  
 protected: 0G+Q^]0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support nF@**,C Q  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); UGSZg|&6#*  
  //}}AFX_VIRTUAL {V6&((E8  
  // Implementation #7i*Diqf9  
 protected: )i~AXBt}  
  HICON m_hIcon; iApq!u,  
  // Generated message map functions & Q3Fgj  
  //{{AFX_MSG(CCaptureDlg) ,AP0*Ln  
  virtual BOOL OnInitDialog(); eX+36VG\  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); w*-42r3,'  
  afx_msg void OnPaint(); sp,-JZD  
  afx_msg HCURSOR OnQueryDragIcon(); oX|T&"&  
  virtual void OnCancel(); e9o\qEm   
  afx_msg void OnAbout(); xqt?z n  
  afx_msg void OnBrowse(); $fmTa02q>  
  afx_msg void OnChange(); `,qft[1  
 //}}AFX_MSG qYC&0`:H  
 DECLARE_MESSAGE_MAP() \baY+,Dr+  
}; ZwkUd-=0i  
#endif Cz0FA]-g  
Ix-Mp   
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 4!IuTPmr  
#include "stdafx.h" nGH6D2!F  
#include "Capture.h" N&HI)X2&  
#include "CaptureDlg.h" >v]^nJl  
#include <windowsx.h> "+(|]q"W  
#pragma comment(lib,"hook.lib") N d].(_  
#ifdef _DEBUG ubwM*P  
#define new DEBUG_NEW jH< #)R  
#undef THIS_FILE 1&|]8=pG7  
static char THIS_FILE[] = __FILE__; F\m^slsu7=  
#endif V|8'3=Z=  
#define IDM_SHELL WM_USER+1 <T}^:2G|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .nPOjwEx&Y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); j'D%eQI,V  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; BU:;;iV8  
class CAboutDlg : public CDialog 0P$1=oK  
{ 8A#,*@V[  
 public: ~CNB3r5R  
  CAboutDlg(); MgXZN{  
  // Dialog Data o701RG ~)  
  //{{AFX_DATA(CAboutDlg) csy6_q(  
  enum { IDD = IDD_ABOUTBOX }; MTu\T  
  //}}AFX_DATA 8ymdg\I+L  
  // ClassWizard generated virtual function overrides BJjic%V  
  //{{AFX_VIRTUAL(CAboutDlg) TTXF r  
 protected: w?ugZYwX*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support NM{)liP ;8  
  //}}AFX_VIRTUAL _4by3?<c  
  // Implementation J :O!4gI  
 protected: cYA:k  
  //{{AFX_MSG(CAboutDlg) Xdn&%5rI  
  //}}AFX_MSG B4y_{V  
  DECLARE_MESSAGE_MAP() Fi i(dmn  
}; wW%b~JX  
$|~ <6A{y  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) i!a!qE.1  
{ `NIb? /!f  
 //{{AFX_DATA_INIT(CAboutDlg) QTHY{:Rmu  
 //}}AFX_DATA_INIT t\M6 d6  
} eC-&.Fl  
 NNt n  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 90vWqL!  
{ ZFtx&vr P  
 CDialog::DoDataExchange(pDX); 4|?(LHBD)  
 //{{AFX_DATA_MAP(CAboutDlg) 1aAOT6h  
 //}}AFX_DATA_MAP ~O}r<PQ  
} D_l$"35?  
zDvV%+RW)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $MR1 *_\V  
 //{{AFX_MSG_MAP(CAboutDlg) ctP+ECH  
 // No message handlers n9Fq^^?  
 //}}AFX_MSG_MAP evyjHcCx  
END_MESSAGE_MAP() RN`TUCQL  
Xh8U}w<k6  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) SoziFI  
: CDialog(CCaptureDlg::IDD, pParent) G<CD 4:V  
{ #:?:gY<  
 //{{AFX_DATA_INIT(CCaptureDlg) BZ?w}%-MO  
  m_bControl = FALSE; .#&)%}GC  
  m_bAlt = FALSE; tj;47UtH  
  m_bShift = FALSE; y4kn2Mw;  
  m_Path = _T("c:\\"); 7J);{ &x9h  
  m_Number = _T("0 picture captured."); Oe Q[-e  
  nCount=0; ntIR#fB  
  bRegistered=FALSE; /dCsZA  
  bTray=FALSE; ~cm4e>o  
 //}}AFX_DATA_INIT $n<1D -0!r  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 -b!?9T?}  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); RvR.t"8  
} #N][-i  
f#l9rV"@g  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ^&;,n.X5Z  
{ K@p9_K8  
 CDialog::DoDataExchange(pDX); ^]o H}lwO  
 //{{AFX_DATA_MAP(CCaptureDlg) n/v.U,f&l@  
  DDX_Control(pDX, IDC_KEY, m_Key); q]4h#?.-1v  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); XJo.^<m  
  DDX_Check(pDX, IDC_ALT, m_bAlt); KpGx<+0p  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ;-3&yQ7N)  
  DDX_Text(pDX, IDC_PATH, m_Path); X5o*8Bg4M  
  DDX_Text(pDX, IDC_NUMBER, m_Number); q7CLxv &QG  
 //}}AFX_DATA_MAP - +a,Ej  
} iQO4IT   
"~VKUvDu  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) T={!/y+  
//{{AFX_MSG_MAP(CCaptureDlg) k~ )CJ6}  
 ON_WM_SYSCOMMAND() "nz\YQdg  
 ON_WM_PAINT() r5gqRh}+  
 ON_WM_QUERYDRAGICON() '-"[>`[q  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Z` kVyuQ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2sGKn a  
 ON_BN_CLICKED(ID_CHANGE, OnChange) : ;8L1'  
//}}AFX_MSG_MAP E:qh}wY  
END_MESSAGE_MAP() 7)U ik}0  
! >F70  
BOOL CCaptureDlg::OnInitDialog() GbLHzw  
{ {+lU4u  
 CDialog::OnInitDialog(); ICz:>4M-dn  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); fgqCX:SWz  
 ASSERT(IDM_ABOUTBOX < 0xF000); {>km]CG  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 1L`V{\_0s  
 if (pSysMenu != NULL) @v`.^L{P  
 { Ys.GBSlHG  
  CString strAboutMenu; (g@X.*c8  
  strAboutMenu.LoadString(IDS_ABOUTBOX); %f CkR`:  
  if (!strAboutMenu.IsEmpty()) >K'dgJ245  
  { <<-L,0  
   pSysMenu->AppendMenu(MF_SEPARATOR); '9QEG/v  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); %e[E@H7  
  } #|T"6jJaQ  
 } jwjLxt  
 SetIcon(m_hIcon, TRUE); // Set big icon ;HCK iHC  
 SetIcon(m_hIcon, FALSE); // Set small icon -~c-mt  
 m_Key.SetCurSel(0); Q&0`(okb  
 RegisterHotkey(); F=Xb_Gd`  
 CMenu* pMenu=GetSystemMenu(FALSE); </kuJh\  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); *ELU">!}G  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND);  j=pg5T  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); v2tVq_\AMx  
 return TRUE; // return TRUE unless you set the focus to a control 8d$|JN;)  
} xbi\KT`~  
ZklO9Ox(  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |*48J1:1y  
{ jW7ffb `O  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ; o'>`=Y  
 { K bQXH!J  
  CAboutDlg dlgAbout; xq.kH|bH  
  dlgAbout.DoModal(); 5`3 x(=b  
 } r?u4[ Oe#  
 else ;i.MDW^N  
 { tQG'f*4  
  CDialog::OnSysCommand(nID, lParam); GH':Yk  
 } 4IW fp&Q!  
} y_>DszRN`u  
z#Qe$`4&  
void CCaptureDlg::OnPaint() 2ih}?%H8  
{ lV:feX  
 if (IsIconic()) [^GBg>k  
 { ..Dm@m}  
  CPaintDC dc(this); // device context for painting /&\ V6=jA1  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); X9PbU1o;  
  // Center icon in client rectangle @-K[@e/uwy  
  int cxIcon = GetSystemMetrics(SM_CXICON); ;07$G+['  
  int cyIcon = GetSystemMetrics(SM_CYICON); Xl1%c7r.1  
  CRect rect; kI a16m  
  GetClientRect(&rect); 9:g A0Z  
  int x = (rect.Width() - cxIcon + 1) / 2; =^p}JhQ  
  int y = (rect.Height() - cyIcon + 1) / 2; 9BP'[SM%),  
  // Draw the icon gJp6ReZ#  
  dc.DrawIcon(x, y, m_hIcon); O`Qke Z}  
 } T*@o?U  
 else J0vQqTaT  
 { P(yLRc  
  CDialog::OnPaint(); Wgs6}1b g  
 } sMAj?]hI$  
} 4S*ifl  
N"<.v6Z  
HCURSOR CCaptureDlg::OnQueryDragIcon() 0'f\>4B  
{ $aEv*{$y  
 return (HCURSOR) m_hIcon; OYxYlUq  
} U]+IP;YS  
Kg~D~ +j  
void CCaptureDlg::OnCancel() TDZ==<C  
{ 94O\M RQ*  
 if(bTray) *jQ$\|Y  
  DeleteIcon(); )2wf D  
  CDialog::OnCancel(); L<oQKe7Q:  
} g$2#TWW5  
4$, W\d  
void CCaptureDlg::OnAbout() i._RMl5zg  
{ FZ%h7Oe  
 CAboutDlg dlg; g]JJ!$*1  
 dlg.DoModal(); qZ E3T:S  
} pam9wfP  
"0nsYE  
void CCaptureDlg::OnBrowse() 5m'AT]5Tn_  
{ hC8WRxEGq  
 CString str; 'Q=)-  
 BROWSEINFO bi; #%ld~dgz-  
 char name[MAX_PATH]; EKcPJ\7  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); NAtDt=  
 bi.hwndOwner=GetSafeHwnd();  k4<28  
 bi.pszDisplayName=name; #?r|6<4X  
 bi.lpszTitle="Select folder"; 8pA<1H%  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; KwMt@1Z  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); t}I@Rmso  
 if(idl==NULL) l=" X|t   
  return; zJ(DO>,p&  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); K%L6UQ;  
 str.ReleaseBuffer(); 6^J[SQ6P  
 m_Path=str; ]!!?gnPd5  
 if(str.GetAt(str.GetLength()-1)!='\\') (x/:j*`K  
  m_Path+="\\"; u59l)8=  
 UpdateData(FALSE); |S).,B  
} ;p~!('{P  
c\>I0HH;!  
void CCaptureDlg::SaveBmp() |.RyF@N`T  
{ glo G_*W  
 CDC dc; |uz<)  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); <Qv/# k  
 CBitmap bm; ( sl{Rgxe*  
 int Width=GetSystemMetrics(SM_CXSCREEN); 2DsP "q79k  
 int Height=GetSystemMetrics(SM_CYSCREEN); _IOUhMo  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 3mYW]  
 CDC tdc; `Rq|*:LV  
 tdc.CreateCompatibleDC(&dc); "XV@O jr E  
 CBitmap*pOld=tdc.SelectObject(&bm); 8Uh|V&  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); SD*q+Si,1U  
 tdc.SelectObject(pOld); PHT<]:"`<  
 BITMAP btm; 'l!\2Wv2  
 bm.GetBitmap(&btm); l,Y5VGiH#  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; [/*;}NUv  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ;Q q_  
 BITMAPINFOHEADER bih; 6RxI9{ry  
 bih.biBitCount=btm.bmBitsPixel; C[%&;\3S@  
 bih.biClrImportant=0; Sn'!Nq>  
 bih.biClrUsed=0; 6y Muj<L  
 bih.biCompression=0; A)!W VT&2A  
 bih.biHeight=btm.bmHeight; }&7kT7ogO  
 bih.biPlanes=1; vf>d{F^rv  
 bih.biSize=sizeof(BITMAPINFOHEADER); Bi;a~qE  
 bih.biSizeImage=size; }OnU32P  
 bih.biWidth=btm.bmWidth; `_GCS,/t  
 bih.biXPelsPerMeter=0; ZRc^}5}WA  
 bih.biYPelsPerMeter=0; rxol7"2l  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ??B!UXi4R  
 static int filecount=0; XW8@c2jN\7  
 CString name; eLh35tw  
 name.Format("pict%04d.bmp",filecount++); kR^">s/H#  
 name=m_Path+name; MIkp4A  
 BITMAPFILEHEADER bfh; .eVX/6,  
 bfh.bfReserved1=bfh.bfReserved2=0; gn/]1NNfR  
 bfh.bfType=((WORD)('M'<< 8)|'B'); O^./) #!#  
 bfh.bfSize=54+size; )S4ga  
 bfh.bfOffBits=54; O SUiS`k  
 CFile bf; k0\a7$}F  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ xWa[qCr  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 0&| M/  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); [ R8BcO(  
  bf.WriteHuge(lpData,size); Ca?w"m~h  
  bf.Close(); W[`ybGR<  
  nCount++; +?3RC$jyw  
 } [#\OCdb*3  
 GlobalFreePtr(lpData); 6A5.n?B{  
 if(nCount==1) Rl0"9D87z  
  m_Number.Format("%d picture captured.",nCount); bxxLAWQ(  
 else S?i^ ~  
  m_Number.Format("%d pictures captured.",nCount); O \o@]  
  UpdateData(FALSE); Cb<7?),vK  
} or;VmU8$zb  
cf>lY  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) * Uy>F[%@  
{ ,3}+t6O"  
 if(pMsg -> message == WM_KEYDOWN) a9^})By&  
 {  Jn|<G  
  if(pMsg -> wParam == VK_ESCAPE) ^9hc`.5N&?  
   return TRUE; -*w2<DCn  
  if(pMsg -> wParam == VK_RETURN) q3/4l%"X  
   return TRUE; yr>J^Et%_  
 } p}!)4EI=  
 return CDialog::PreTranslateMessage(pMsg); O\;Lb[`lb  
} <bCB-lG*Kb  
6K8v:yYPa  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) mP15PZ  
{ $(0<T<\  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ n;xzjq-  
  SaveBmp(); rttKj{7E  
  return FALSE; >a2[P"   
} ,*lns.|n  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2w1Mf<IXPo  
 CMenu pop; 5Y`4%*$  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); N`N=}&v ]  
 CMenu*pMenu=pop.GetSubMenu(0); T$r/XAs  
 pMenu->SetDefaultItem(ID_EXITICON); 7g{JE^u  
 CPoint pt; o8E<_rei  
 GetCursorPos(&pt); hB\BFVUSn/  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); d72 yu3  
 if(id==ID_EXITICON) O3slYd&V  
  DeleteIcon(); twldwuN  
 else if(id==ID_EXIT) !}U3{L-  
  OnCancel(); x7l}u`N4  
 return FALSE; 6OC4?#96%'  
} sP@XV/`3L6  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 8aRmHy"9l  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) }mZCQJ#`  
 AddIcon(); ^_G#JJ\@$  
 return res; &"tQpw5  
} ny^uNIRPR  
}*-fh$QJ  
void CCaptureDlg::AddIcon() p*cyW l  
{ Mx93D   
 NOTIFYICONDATA data; dXY}B=C  
 data.cbSize=sizeof(NOTIFYICONDATA); 5B8/"G  
 CString tip; leizjL\P  
 tip.LoadString(IDS_ICONTIP); V5h_uGOD  
 data.hIcon=GetIcon(0); e>!]_B1ad  
 data.hWnd=GetSafeHwnd(); -Tuk.>i)  
 strcpy(data.szTip,tip); Qqb%^}Xx'u  
 data.uCallbackMessage=IDM_SHELL; *Y53b Z  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 3~WI3ZIR  
 data.uID=98; @*op5qVw  
 Shell_NotifyIcon(NIM_ADD,&data); q(s0dkrj  
 ShowWindow(SW_HIDE); !m_y@~pV#u  
 bTray=TRUE; '5T:*Yh  
} 'X&"(M  
yl' IL#n]r  
void CCaptureDlg::DeleteIcon() 5c%Fb :BW=  
{ h= YTgJ  
 NOTIFYICONDATA data; <R2SV=]Sq#  
 data.cbSize=sizeof(NOTIFYICONDATA); Bgsi$2hI  
 data.hWnd=GetSafeHwnd(); !VG ]~lc  
 data.uID=98; xQ?$H?5B<  
 Shell_NotifyIcon(NIM_DELETE,&data); d--6<_q  
 ShowWindow(SW_SHOW); u, 72Mm>  
 SetForegroundWindow(); r`)'Kd  
 ShowWindow(SW_SHOWNORMAL); +\PLUOk  
 bTray=FALSE; *$('ous8  
} jgpF+V-n$  
MbTmdRf  
void CCaptureDlg::OnChange() z'>b)wY](  
{ 8193d%Wb  
 RegisterHotkey(); @1pfH\m  
} 3v#F0s|  
y?}<SnjP:  
BOOL CCaptureDlg::RegisterHotkey() a{By U%  
{ +]H!q W:  
 UpdateData(); 0H'G./8  
 UCHAR mask=0; !14v Ovj4{  
 UCHAR key=0; cZ.p  
 if(m_bControl) @v /Ae_q!  
  mask|=4; 0Y~5|OXJ  
 if(m_bAlt) 1Sns$t%b  
  mask|=2; q8e]{sT'!  
 if(m_bShift) [zrFW g6N  
  mask|=1; a*_" nI&lr  
  key=Key_Table[m_Key.GetCurSel()]; sC :.}6  
 if(bRegistered){ Y{4nBu  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); \Q?#^<O  
  bRegistered=FALSE; *'n=LB8R  
 } {ueDwnZ  
 cMask=mask; rXGaav9  
 cKey=key; ldaT: er9  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); cft@s Y  
 return bRegistered; f.vJJa  
} ~ /K'n  
FA%BzU5^  
  四、小结 CA/Lv{[2  
+- hfl/$  
  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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