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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: Y$OE[nGi%X  
  T>'w]wi  
  一、实现方法 O]I AIM  
N1Y uLG:  
  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: @.L#u#   
^C K!=oO  
#pragma data_seg("shareddata") |21V OPBS  
HHOOK hHook =NULL; //钩子句柄 $}4ao2  
UINT nHookCount =0; //挂接的程序数目  D?Beg F  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 r;@0 F  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 =bp'5h8_  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey /%g@ ;  
static int KeyCount =0; !~zn*Hm  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 O C;~ H{  
#pragma data_seg() 92j[b_P  
(%6fZ  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 O=K0KOj  
13@e mb  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: :"y2u   
h7eb/xEto  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR RSAGSGp  
cKey,UCHAR cMask) b\\l EM>o1  
{ n%WjU)<  
 BOOL bAdded=FALSE; I?1 BGaAA  
 for(int index=0;index<MAX_KEY;index++){ blomB2vQ  
  if(hCallWnd[index]==0){ ce$ [H}rDB  
   hCallWnd[index]=hWnd; *lDVV,T'}w  
   HotKey[index]=cKey; eJf]"-  
   HotKeyMask[index]=cMask; 8A0a/ 7Lj  
   bAdded=TRUE; }#<Rs  
   KeyCount++; SOPair <r  
   break; hc W>R  
  } $mT)<N ;w  
 } /pRv i>_(:  
 return bAdded; .8'c c8  
} -I4@6v E,  
//删除热键 ,]t_9B QK  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A#`$#CO  
{ e6*,MnqBh  
 BOOL bRemoved=FALSE; |Fx *,91  
 for(int index=0;index<MAX_KEY;index++){ xm=Gt$>.o  
  if(hCallWnd[index]==hWnd){ sw9ri}oc  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ n3? msY(*  
    hCallWnd[index]=NULL; 3ylSO73R  
    HotKey[index]=0; ;pL!cG@  
    HotKeyMask[index]=0; %V1jM  
    bRemoved=TRUE; N~b0b;e  
    KeyCount--; {.U:Ce  
    break; IT#Li  
   } bR}fj.gP  
  } `s69p'<;p  
 } k v_t6(qd  
 return bRemoved; {^Q,G x(  
} ;mI^J=V3  
,n%b~.$:v5  
,dd1/zm  
  DLL中的钩子函数如下: le_a IbB"P  
bp" @ p:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 'PrBa[%  
{ GfSD% "  
 BOOL bProcessed=FALSE; h}tC +_"D  
 if(HC_ACTION==nCode) {ZdF6~+H(!  
 { WNeBthq6  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 *oLDy1<  
   switch(wParam) G'Wp)W;])\  
   {  e1b?TF@lz  
    case VK_MENU: Q e/XEW  
     MaskBits&=~ALTBIT; +P 9eE,WR  
     break; r(>812^\  
    case VK_CONTROL: xxg/vaQt=s  
     MaskBits&=~CTRLBIT; o/&K>]8M  
     break; gKQs:25  
    case VK_SHIFT: Txl|F\nK`  
     MaskBits&=~SHIFTBIT; ;Y8>?  
     break; #I MaN%  
    default: //judge the key and send message v2r|) c,h  
     break; wQ/.3V[  
   } z&c}  
   for(int index=0;index<MAX_KEY;index++){ Qe!3ae`Z  
    if(hCallWnd[index]==NULL) }Z\S__\9  
     continue; *qYw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )n<p_vz  
    { "\vQVZd-E  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;,uATd|  
     bProcessed=TRUE; p,f$9t4  
    } }%c>Hh  
   } |Y6;8e`H  
  } MtF^}/0w!`  
  else if((lParam&0xc000ffff)==1){ //有键按下 = [: E  
   switch(wParam) E`xpZ>$mPx  
   { a* }>yad  
    case VK_MENU: 4o ";p}[b  
     MaskBits|=ALTBIT; y8C8~-&OK  
     break; 'C`Ykjf  
    case VK_CONTROL: 4*o?2P$Q  
     MaskBits|=CTRLBIT; IMM+g]#e  
     break; @d^DU5ats>  
    case VK_SHIFT: RO3q!+a$/  
     MaskBits|=SHIFTBIT; cL%"AVsj >  
     break; >hSu1s:  
    default: //judge the key and send message RX_f[  
     break; ~xDu2 -5  
   } !/a6;:_y  
   for(int index=0;index<MAX_KEY;index++){ O3T7O`H[  
    if(hCallWnd[index]==NULL) k{S8q?Gc  
     continue; C[jX;//Jiu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Qc!3y>Y=_  
    { o~CEja &(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); T.')XKP)1N  
     bProcessed=TRUE; !Ea9 fe  
    } 9 !UNO  
   } KJ S-{ed  
  } gMZ+kP`  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 _NwHT`O[  
   for(int index=0;index<MAX_KEY;index++){ br TP}A  
    if(hCallWnd[index]==NULL) #*w)rGkU2  
     continue; Ahbh,U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {98e_z w  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); O0 Uh  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 k' Fu&r  
   } bYpeI(zK  
  }  ~H   
 } lIx./Nf  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); KXl!VD,#`=  
} TF!v,cX  
p_]b=3wt~  
  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: -F*vN'  
 Pw +nO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [MKG5=kaE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Qm*ZOz'i  
? * ,  
  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: E`@Z9k1 `  
hosY`"X  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]jiVe_ OS<  
{ Zo^]y'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) '/X]96Ci7  
 {   !\BM  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 v.4G>00^  
  SaveBmp(); n53c} ^  
  return FALSE; 3HuGb^SNg  
 } 6r D]6#D  
 …… //其它处理及默认处理 E8R;S}P A  
} S-3hLw&?  
RjgJIVm(  
:?y Ma$  
  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。 +?Cy8Ev?  
YAeF*vP  
  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。 _/%,cYVc8!  
}a9G,@:k  
  二、编程步骤 W[j, QU  
rev*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"; %yjD<2J;  
v[8+fd)}S  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; T2.[iD!A  
ITn PF{N  
  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; 3Z me?o*bY  
f{[0;qDJ  
  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; liLhvcd  
%m[ZU<v  
  5、 添加代码,编译运行程序。 Z_S{$D  
Gky^S#  
三、程序代码 0WSZhzNyY  
E'U x2sh  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL g3{UP]Z71  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) gVR]z9  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ k 9z9{  
#if _MSC_VER > 1000 XQfmD;U  
#pragma once -}h^'#  
#endif // _MSC_VER > 1000 M;OMsRCVO  
#ifndef __AFXWIN_H__ {i8 zM6eC  
#error include 'stdafx.h' before including this file for PCH ~7*2Jp'  
#endif &(32s!qH  
#include "resource.h" // main symbols NW 2`)e'  
class CHookApp : public CWinApp ^eO/?D8~h  
{ b.\xPb  
 public: ).(y#zJ7P  
  CHookApp(); *W^ZXhrZ  
  // Overrides r;[=y<Yf  
  // ClassWizard generated virtual function overrides +DR$>a  
  //{{AFX_VIRTUAL(CHookApp) =Tl_~OR  
 public: t8xXGWk0  
  virtual BOOL InitInstance(); .PR+_a-X  
  virtual int ExitInstance(); {]dtA&8(  
  //}}AFX_VIRTUAL fG$LqzyqlK  
  //{{AFX_MSG(CHookApp) ~gMt U  
  // NOTE - the ClassWizard will add and remove member functions here. rJCb8x+5a  
  // DO NOT EDIT what you see in these blocks of generated code ! gM=:80  
  //}}AFX_MSG m9i/rK_  
  DECLARE_MESSAGE_MAP() y5+%8#3  
}; E0&d*BI2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); btq 4diW  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4sn\UuKyL  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 650qG$  
BOOL InitHotkey(); ^IIy>  
BOOL UnInit(); v}V[sIs}  
#endif nM b@  B  
u Z-ZZE C  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.  <9yh:1"X  
#include "stdafx.h" 7X/t2Vih@  
#include "hook.h" p e+h8  
#include <windowsx.h> GbL1<P$V  
#ifdef _DEBUG 9jEH"`qqk  
#define new DEBUG_NEW L*A-&9.p3  
#undef THIS_FILE $$&.}}.,  
static char THIS_FILE[] = __FILE__; +s"6[\H1d  
#endif HBtk)  
#define MAX_KEY 100 PS[ C!s&KE  
#define CTRLBIT 0x04 }(ORh2Ri  
#define ALTBIT 0x02 \ I523$a  
#define SHIFTBIT 0x01 |llJ%JhF  
#pragma data_seg("shareddata") 0.n[_?<(  
HHOOK hHook =NULL; bSX/)')jU  
UINT nHookCount =0; Y-YuY  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey B#SVN Lv  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT tZKw(<am  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey LjG^c>[:m  
static int KeyCount =0; fTvm2+.nX  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Cg]),S  
#pragma data_seg() HRDpFMA/~  
HINSTANCE hins; NBc^(F"  
void VerifyWindow(); 6xJffl  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) R54[U  
//{{AFX_MSG_MAP(CHookApp) }\7UU?@n  
// NOTE - the ClassWizard will add and remove mapping macros here. $P0q!  
// DO NOT EDIT what you see in these blocks of generated code! t n5  
//}}AFX_MSG_MAP ^1bslCe   
END_MESSAGE_MAP() M[YFyM(  
A:r?#7 Ma  
CHookApp::CHookApp() ~&73f7  
{ "/i$_vl  
 // TODO: add construction code here, V<0iYi;4=  
 // Place all significant initialization in InitInstance &S*~EM.l8  
} UlE%\L0GD&  
EaO@I.[  
CHookApp theApp; =xI'|%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)  V>'  
{ #lP8/-s^  
 BOOL bProcessed=FALSE; ;X,u   
 if(HC_ACTION==nCode) "[|b,fxR  
 { e}e8WR=B  
  if((lParam&0xc0000000)==0xc0000000){// Key up ns8s2kYcm  
   switch(wParam) x 6`!  
   { 2L^)k?9>g+  
    case VK_MENU: yS\&2"o  
     MaskBits&=~ALTBIT; YS9RfK/  
     break; NFs5XpZ~  
    case VK_CONTROL: N"ga -u  
     MaskBits&=~CTRLBIT; ;Y`Y1  
     break; .Q*X5Fc  
    case VK_SHIFT: S13cQ?4  
     MaskBits&=~SHIFTBIT; GrL{q;IO  
     break; ^QRg9s,T<  
    default: //judge the key and send message |:=o\eu&  
     break; /8h=6"  
   } H0Pxw P>q  
   for(int index=0;index<MAX_KEY;index++){ 2nd n8_l  
    if(hCallWnd[index]==NULL) )S)L9('IxT  
     continue; tF0jH+7J-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B;1qy[  
    { w6% Q"%rp  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); &[.`xZ(|  
     bProcessed=TRUE; WVbrbs4  
    } q!5:M\  
   } 8-#%l~dr  
  } +J X;T(T  
  else if((lParam&0xc000ffff)==1){ //Key down g\JJkXjD#  
   switch(wParam) V0\[|E;F  
   { HgF;[rq3Q  
    case VK_MENU: EiW|+@1  
     MaskBits|=ALTBIT; /fr>Fd  
     break; bV_nYpo  
    case VK_CONTROL: FRBu8WW0L  
     MaskBits|=CTRLBIT; w )R5P[b  
     break; L_8zZ8 o  
    case VK_SHIFT: L[ G O6l  
     MaskBits|=SHIFTBIT; N4!`iS Y  
     break; C9 n%!()>  
    default: //judge the key and send message 'YNaLZ20  
     break; 9E!le=>  
   } XIHN6aQ{X  
   for(int index=0;index<MAX_KEY;index++) u/zBz*zh  
   { ?{{w[U6NE  
    if(hCallWnd[index]==NULL) 6[> lzEZ  
     continue; x*Lt]]A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,5}U H  
    { _kj]vbG^;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); kmI0V[Y  
     bProcessed=TRUE; !'7fOP-J]  
    } #%0V`BS7n  
   } ~C.*Vc?|  
  } `FP?9R6Y  
  if(!bProcessed){ _u`YjzK  
   for(int index=0;index<MAX_KEY;index++){ Mqf Ns<2  
    if(hCallWnd[index]==NULL) ^mS |ff  
     continue; Ccf/hA#mb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +eM${JyXH  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); tZrc4$D-  
   } kNEEu! G  
  } Lsmcj{1d  
 } ^PksXfk  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); J3K=z  
} 7|P kc(O  
g,Z A\R~  
BOOL InitHotkey() ie}O ZM  
{ 5,RUPaE  
 if(hHook!=NULL){ R?2sbK4Cz  
  nHookCount++; GF'wDi}  
  return TRUE; _]Hna<Ly  
 } BT$p~XB  
 else W? iA P  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Qw5nfg3T  
  if(hHook!=NULL) Wgq|Q*  
   nHookCount++; OG,P"sv  
  return (hHook!=NULL); sGvbL-S-f:  
} \U~4b_aN  
BOOL UnInit() Nkdv'e\  
{ ;SR ESW  
 if(nHookCount>1){ US6_5>/  
  nHookCount--; 092t6D}  
  return TRUE;  R$a<=  
 } W L$^B@gXQ  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 1SQATUV  
 if(unhooked==TRUE){ &K)8  
  nHookCount=0; ^S9y7b^;r  
  hHook=NULL; YeX*IZX8  
 } !XA3G`}p6s  
 return unhooked; !,WGd|oJ  
} TBhM^\z  
"q4tvcK.  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) B{-7  
{ D7ex{SVA)  
 BOOL bAdded=FALSE; [}X|&`'i  
 for(int index=0;index<MAX_KEY;index++){ <_tmkLeZf  
  if(hCallWnd[index]==0){ +>w]T\[1~  
   hCallWnd[index]=hWnd; ]6&NIz`:,  
   HotKey[index]=cKey; \>L,X_DL  
   HotKeyMask[index]=cMask; 5/48w-fnZ  
   bAdded=TRUE; q>q:ZV  
   KeyCount++; @u3`lhUcT  
   break; e5h*GKF  
  } .u`[|: K  
 } q!K :N?  
 return bAdded; D-3[# ~MV  
} |Td+,>,  
QaX.Av  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) R{hX--|j  
{ bIKg>U'5d  
 BOOL bRemoved=FALSE; (iIw }f)w  
 for(int index=0;index<MAX_KEY;index++){ &{iC:zp  
  if(hCallWnd[index]==hWnd){ 3KLUH=)P  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ T?9D?u?]  
    hCallWnd[index]=NULL; ><%585  
    HotKey[index]=0; C \ Cc[v  
    HotKeyMask[index]=0; >&L|oq7$  
    bRemoved=TRUE; N,ht<l\  
    KeyCount--; oL4W>b )  
    break; ;rh.6Dl  
   } ]`o5eByo  
  } WxdQ^#AE  
 } 4" @<bKx  
 return bRemoved; }E`Y.= S  
} z,HhSW?&^  
~KK 9aV{  
void VerifyWindow() 77e*9/6@  
{  Xo^8o0xi  
 for(int i=0;i<MAX_KEY;i++){ ,'NasL8?We  
  if(hCallWnd!=NULL){  *7Dba5B  
   if(!IsWindow(hCallWnd)){ 2 a<\4w'  
    hCallWnd=NULL; k(Yz2  
    HotKey=0; ]A4=/6`g?b  
    HotKeyMask=0; {+N< 9(O  
    KeyCount--; Z:b?^u4.  
   } EZtU6kW"  
  } {%jAp11y+O  
 } I-v} DuM  
} 3F9V,zWtTi  
6)HmE[[F  
BOOL CHookApp::InitInstance() ~cz}C("Z  
{ !}*N';  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Da^q9,|  
 hins=AfxGetInstanceHandle(); yUoR6w  
 InitHotkey(); ~f QrH%@  
 return CWinApp::InitInstance(); r}U6LE?>  
} C*`WMP*  
l,ny=Q$[1'  
int CHookApp::ExitInstance() $+eeE  
{ uLms0r\@!  
 VerifyWindow(); mq:k |w^6  
 UnInit(); Xz]l#w4 Pp  
 return CWinApp::ExitInstance(); u09Tlqh0 3  
} $ m`Dyu  
verI~M$v{  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file +/OSg.  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) !_glZ*tL  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Q+CJd>B  
#if _MSC_VER > 1000 ; :e7Z^\/k  
#pragma once ?7\V)$00(&  
#endif // _MSC_VER > 1000 0 9H rn  
2w>%-_]u+  
class CCaptureDlg : public CDialog ,%i Scr,z  
{ e8,_"_1 :F  
 // Construction  ^`H'LD  
 public: tX*@r  
  BOOL bTray; ITPE2x  
  BOOL bRegistered; g 2Fg  
  BOOL RegisterHotkey(); 2:LUB)&i  
  UCHAR cKey; 7uBx  
  UCHAR cMask; I=`?4%  
  void DeleteIcon(); +h) "m/mE  
  void AddIcon(); a%go[_w  
  UINT nCount; <O jK $KV  
  void SaveBmp(); o:8ns m  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor *h^->+0n  
  // Dialog Data tqZ91QpW  
  //{{AFX_DATA(CCaptureDlg) * :"*'  
  enum { IDD = IDD_CAPTURE_DIALOG }; YznL+TD  
  CComboBox m_Key; _/[qBe  
  BOOL m_bControl; +|?a7qM  
  BOOL m_bAlt; -]%EX:bm  
  BOOL m_bShift; K^{j$  
  CString m_Path; &{)<Q(g  
  CString m_Number; vuQA-w7  
  //}}AFX_DATA hB?#b`i^  
  // ClassWizard generated virtual function overrides ;NP-tA)  
  //{{AFX_VIRTUAL(CCaptureDlg) 0jp].''RK\  
 public: %Tp9G Gt  
  virtual BOOL PreTranslateMessage(MSG* pMsg); [bLKjD  
 protected: OPvPP>0*8  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6/!:vsa"3  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 288mP]a(v_  
  //}}AFX_VIRTUAL O"9t,B>=i  
  // Implementation $.,PteYK  
 protected: [[T7s(3  
  HICON m_hIcon; ueg%yvO  
  // Generated message map functions \Y xG  
  //{{AFX_MSG(CCaptureDlg) l@Lk+-[D  
  virtual BOOL OnInitDialog(); d% EdvM|)  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); &0 QUObK  
  afx_msg void OnPaint(); <?7CwW  
  afx_msg HCURSOR OnQueryDragIcon(); tmGhJZ2j  
  virtual void OnCancel();  ;LS.  
  afx_msg void OnAbout(); ^P^"t^O  
  afx_msg void OnBrowse(); V7$ m.P#uM  
  afx_msg void OnChange(); Yjg$o:M  
 //}}AFX_MSG 3P_.SF  
 DECLARE_MESSAGE_MAP() 1@Ba7>%'  
}; Hc/7x).  
#endif ;&lXgC^*  
(JU8F-/9  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file (4Db%Iw  
#include "stdafx.h" hC-uz _/3  
#include "Capture.h" hu-]SGb6  
#include "CaptureDlg.h" hl]d99Lc  
#include <windowsx.h> `=Mk6$%Cs  
#pragma comment(lib,"hook.lib") 6@aH2+4+  
#ifdef _DEBUG CI+)0=`<1B  
#define new DEBUG_NEW &UDbH* !4=  
#undef THIS_FILE G-CL \G\n  
static char THIS_FILE[] = __FILE__; D(z#)oDr  
#endif zB m~J%  
#define IDM_SHELL WM_USER+1 WjBml'^RY  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U/c+j{=~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &4E|c[HN  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; <v ub Q4  
class CAboutDlg : public CDialog c| %5SA  
{ 2tU3p<[  
 public: :M6|V_Yp  
  CAboutDlg(); eg~ Dm>Es  
  // Dialog Data Rd(8j+Q?ps  
  //{{AFX_DATA(CAboutDlg) Eq@sU?j  
  enum { IDD = IDD_ABOUTBOX }; !19T=p/:$  
  //}}AFX_DATA ?;=7{E j  
  // ClassWizard generated virtual function overrides d{TcjZ  
  //{{AFX_VIRTUAL(CAboutDlg) HubG>]  
 protected: u%L6@M2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support padV|hF3(e  
  //}}AFX_VIRTUAL Qfeu3AT  
  // Implementation hzbvR~rn  
 protected: K*^'t ltJ  
  //{{AFX_MSG(CAboutDlg) bLTX_ R  
  //}}AFX_MSG Zn1((J7  
  DECLARE_MESSAGE_MAP() \;%D;3Au  
}; <F`9;WX  
2SU'lh\E  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) lC*xyO K  
{ F_u ?.6e]  
 //{{AFX_DATA_INIT(CAboutDlg) z:UkMn[  
 //}}AFX_DATA_INIT 0gyvRM@ x[  
} D}%VZA}].  
FoIK, MdJ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) =}ZY`O*/  
{ -X*.scw  
 CDialog::DoDataExchange(pDX); !'\(OFv9Im  
 //{{AFX_DATA_MAP(CAboutDlg) r:xg#&"*  
 //}}AFX_DATA_MAP [3irr0D7l  
} Jv(E '"H  
z@~Z Mk  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 8<Nz34Y  
 //{{AFX_MSG_MAP(CAboutDlg) 0?R$>=u  
 // No message handlers /3+E-|4s  
 //}}AFX_MSG_MAP *{JD= ua  
END_MESSAGE_MAP() =5:vKL j  
d*!H&1L  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) I9TNUZq('  
: CDialog(CCaptureDlg::IDD, pParent) 2+|r*2_glo  
{ }+ W5Snx  
 //{{AFX_DATA_INIT(CCaptureDlg) ILNghtm-  
  m_bControl = FALSE; -8:O?]+Q/  
  m_bAlt = FALSE; KJn 3&7  
  m_bShift = FALSE; 3F6'3NvVc2  
  m_Path = _T("c:\\"); AED 9vDE  
  m_Number = _T("0 picture captured."); 7DW-brd   
  nCount=0; cB;DB) 0P  
  bRegistered=FALSE; EZQ!~  
  bTray=FALSE; PC=s:`Y}R  
 //}}AFX_DATA_INIT F&/ }x15  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 {YzpYc1  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); J(~xU0gd'  
} ^[HX#JJ~  
|bRi bB  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ZZL%5{ w_  
{ Y\H4.$V  
 CDialog::DoDataExchange(pDX); xAsy07J?  
 //{{AFX_DATA_MAP(CCaptureDlg) .<P@6Jq  
  DDX_Control(pDX, IDC_KEY, m_Key); ;?o"{mbb  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); oxCfSA  
  DDX_Check(pDX, IDC_ALT, m_bAlt); a`||ePb|W~  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 'u [cT$  
  DDX_Text(pDX, IDC_PATH, m_Path); =F*{O=  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 0O q5;5  
 //}}AFX_DATA_MAP m[5ed1+  
} lKirc2  
UR`pZ.U?  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) @[(%b{TE;  
//{{AFX_MSG_MAP(CCaptureDlg) :Ea ]baM"  
 ON_WM_SYSCOMMAND() {-IRX)m*  
 ON_WM_PAINT() _i"[m(ABj1  
 ON_WM_QUERYDRAGICON() KbRKPA`  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) :)e/(I]  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Yh%  
 ON_BN_CLICKED(ID_CHANGE, OnChange) @iz6)2z  
//}}AFX_MSG_MAP =2wy;@f  
END_MESSAGE_MAP() x(zW<J5X"  
3'Z+PPd!  
BOOL CCaptureDlg::OnInitDialog() U&tR1v'  
{ /Hc0~D4|x  
 CDialog::OnInitDialog(); T/7[hj  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 7`X9s~B  
 ASSERT(IDM_ABOUTBOX < 0xF000); B415{  
 CMenu* pSysMenu = GetSystemMenu(FALSE); H% c{ }F  
 if (pSysMenu != NULL) 2wh{[Q2f  
 { {Q L qf   
  CString strAboutMenu; 7w"YCRKh  
  strAboutMenu.LoadString(IDS_ABOUTBOX); iQaFR@  
  if (!strAboutMenu.IsEmpty()) |z%*}DPrpa  
  { i `8Y/$aT  
   pSysMenu->AppendMenu(MF_SEPARATOR); @}N;C ..Y$  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); [C~{g#  
  } jr5x!@rb  
 } W/R-~C e  
 SetIcon(m_hIcon, TRUE); // Set big icon fm% Y*<Y"  
 SetIcon(m_hIcon, FALSE); // Set small icon @*LESN>T@t  
 m_Key.SetCurSel(0); +hvVoBCM*  
 RegisterHotkey(); ?9H.JR2s%  
 CMenu* pMenu=GetSystemMenu(FALSE); ~Urj:l  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); yYTiAvN  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ">RDa<H]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); )@YrHS4  
 return TRUE; // return TRUE unless you set the focus to a control 80M4~'3  
} _^ @}LVv+E  
0:Lm=9o  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) cE= v566  
{ fx4X!(w!B  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) .!t' &eV  
 { ?G-a:'1!6  
  CAboutDlg dlgAbout; KH&xu,I  
  dlgAbout.DoModal(); /SD2e@x{U  
 } 86@@j*c(@k  
 else  HPj7i;?O  
 { ffyKAZ{]po  
  CDialog::OnSysCommand(nID, lParam); "|"bo5M:   
 } 'x10\Q65[  
} "mE<r2=@  
qx/GioPU  
void CCaptureDlg::OnPaint() 7QRtNYo#\  
{ Hw/1~O$T  
 if (IsIconic()) Z)(C7,Xu  
 { C`x>)wm:  
  CPaintDC dc(this); // device context for painting #PmF@ CHR  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); c>3W1"  
  // Center icon in client rectangle nyPA`)5F0  
  int cxIcon = GetSystemMetrics(SM_CXICON); GRj{*zs  
  int cyIcon = GetSystemMetrics(SM_CYICON); gGdZ}9  
  CRect rect; S*CRVs  
  GetClientRect(&rect); Kc\0-3 Z  
  int x = (rect.Width() - cxIcon + 1) / 2; ziy~~J  
  int y = (rect.Height() - cyIcon + 1) / 2; zn3i2MWS  
  // Draw the icon [w~1e)D  
  dc.DrawIcon(x, y, m_hIcon); g;bkV q  
 } 4S.%y7d\  
 else NzRL(A6V  
 { rReZ$U  
  CDialog::OnPaint(); y?aOk-TaRA  
 } v *~ yN*  
} c66Iy"  
:/Nz' n  
HCURSOR CCaptureDlg::OnQueryDragIcon() ou-5iH?  
{ D1lHq/  
 return (HCURSOR) m_hIcon; bd<zn*H Z*  
} `^afbW  
Ybx4 Up@  
void CCaptureDlg::OnCancel() !H,R$3~  
{ e$tKKcj0T  
 if(bTray) D x Vt  
  DeleteIcon(); f=J#mmH w$  
  CDialog::OnCancel(); mnXaf)"  
} ;mo}$^49*  
mrd(\&EhA  
void CCaptureDlg::OnAbout() ( {zp$P}  
{ } ho8d+A  
 CAboutDlg dlg; bU:"dqRm<  
 dlg.DoModal(); /5r[M=_ihr  
} it>FG9hVo  
mKnkHGM  
void CCaptureDlg::OnBrowse() vC J  
{ CWI(Q`((>  
 CString str; #.tF&$ik  
 BROWSEINFO bi; Yq) wE|k/  
 char name[MAX_PATH]; j|HOry1E&  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 'n.eCd j  
 bi.hwndOwner=GetSafeHwnd(); 8 s:sMU:Q  
 bi.pszDisplayName=name; m2<sVTN`^  
 bi.lpszTitle="Select folder"; w>VM--  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; -oe&1RrdVg  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); }N4=~'R  
 if(idl==NULL) eB!0:nHN  
  return; {My/+{eS!?  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); r"U$udwjg  
 str.ReleaseBuffer(); |$9k z31  
 m_Path=str; &&(sZG w  
 if(str.GetAt(str.GetLength()-1)!='\\') S| !U=&  
  m_Path+="\\"; UO<%|{ W+  
 UpdateData(FALSE); -@L*i|A  
} d:=5y)  
 i)8,u  
void CCaptureDlg::SaveBmp() O-bC+vB]M  
{ b\VY)=U  
 CDC dc; iu&'v  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); u& :-&gva  
 CBitmap bm; Y@^M U->+  
 int Width=GetSystemMetrics(SM_CXSCREEN); > -Jd@7-  
 int Height=GetSystemMetrics(SM_CYSCREEN); \\x``*  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 01#a  
 CDC tdc; `;4zIBJ  
 tdc.CreateCompatibleDC(&dc); H-0A&oG  
 CBitmap*pOld=tdc.SelectObject(&bm); Eh0R0;l5>  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); /[t]m,p$yq  
 tdc.SelectObject(pOld); 0sk*A0HX-  
 BITMAP btm; 1|n,s-  
 bm.GetBitmap(&btm); Gv6EJV1i  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; -~v;'zOO  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); vQ26U(7\>  
 BITMAPINFOHEADER bih; FrB}2  
 bih.biBitCount=btm.bmBitsPixel; SS@# $t:  
 bih.biClrImportant=0; [D?RL `ZF  
 bih.biClrUsed=0; )iluu1,o  
 bih.biCompression=0; *)U=ZO6S  
 bih.biHeight=btm.bmHeight; SG;]Vr  
 bih.biPlanes=1; Nm:nSqc  
 bih.biSize=sizeof(BITMAPINFOHEADER); xAQ=oF +  
 bih.biSizeImage=size; LYkW2h`JQ  
 bih.biWidth=btm.bmWidth; *w59BO&M4  
 bih.biXPelsPerMeter=0; z9YC9m)jK  
 bih.biYPelsPerMeter=0; Y*B}^!k6  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); {Qg"1+hhM  
 static int filecount=0; E,u@,= j  
 CString name; @B*?owba>  
 name.Format("pict%04d.bmp",filecount++); \BbemCPAm  
 name=m_Path+name; "f(iQI  
 BITMAPFILEHEADER bfh; z';p275  
 bfh.bfReserved1=bfh.bfReserved2=0; D*DCMMp=0  
 bfh.bfType=((WORD)('M'<< 8)|'B'); !ZD[ $lt+  
 bfh.bfSize=54+size; n4qj"x Q  
 bfh.bfOffBits=54; .& B_\*  
 CFile bf; %{5mkO&,2  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ FSIV\ u  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); d1D{wZ3g  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); t!AHTtI  
  bf.WriteHuge(lpData,size); [^P25K  
  bf.Close(); e ,k,L  
  nCount++; O:q 0-  
 } <<@$0RW  
 GlobalFreePtr(lpData); kf~ D m}bV  
 if(nCount==1) g(>;Z@Y  
  m_Number.Format("%d picture captured.",nCount); |Ah26<&  
 else k2" Z:\?z  
  m_Number.Format("%d pictures captured.",nCount); k6QQoLb$V  
  UpdateData(FALSE); /4<eI 3Z  
} 0:@:cz=#*  
$A9!} `V  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) q!$?G]-%  
{ lnEc5J@c>i  
 if(pMsg -> message == WM_KEYDOWN) c&e?_@} |  
 { Ef;_im  
  if(pMsg -> wParam == VK_ESCAPE) ~ 61O  
   return TRUE; N9r02c  
  if(pMsg -> wParam == VK_RETURN) kZBIXW,G  
   return TRUE; =oV8 !d%]  
 } iL)q':xz  
 return CDialog::PreTranslateMessage(pMsg); c_)vWU  
} "gfy6m  
6,7Fl=<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) d>M&jSCL  
{ ;m,lS_[c  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ MP-A^QT  
  SaveBmp(); Yi1_oe  
  return FALSE; @AvXBMq|  
} /iQ}DbtRb  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ &G@(f=  
 CMenu pop; 0e^j:~*  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); t^)q[g  
 CMenu*pMenu=pop.GetSubMenu(0); $M@SZknm  
 pMenu->SetDefaultItem(ID_EXITICON); 403%~  
 CPoint pt; Vrf2%$g  
 GetCursorPos(&pt); ,]w -!I  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); @sO*O4os>  
 if(id==ID_EXITICON) -IMm#  
  DeleteIcon(); 1uG?R  
 else if(id==ID_EXIT) 9TjAEeU  
  OnCancel(); p4\%*ovQt  
 return FALSE; /XjIm4EN  
} 4d)w2t?H%  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ;``*]tY$  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 3Wrl_V  
 AddIcon(); \7nlwFAO  
 return res; xAMj16ZF  
} Oj:O-PtN2  
1 M7=*w,  
void CCaptureDlg::AddIcon() %np b.C|+  
{ y@ J\h8_  
 NOTIFYICONDATA data; 4xuL{z;\  
 data.cbSize=sizeof(NOTIFYICONDATA); D9B?9Qt2[  
 CString tip; L}ud+Wfox  
 tip.LoadString(IDS_ICONTIP); p#HPWW"  
 data.hIcon=GetIcon(0); c=<d99Cu!  
 data.hWnd=GetSafeHwnd(); Z~F% K~(  
 strcpy(data.szTip,tip); T {a%:=`  
 data.uCallbackMessage=IDM_SHELL; c>{6NSS -  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 7uFM)b@.P  
 data.uID=98; RXkE"H{  
 Shell_NotifyIcon(NIM_ADD,&data); s[)2z3  
 ShowWindow(SW_HIDE); (pm]U7  
 bTray=TRUE; e,>L&9] ZI  
} #\"8sY,j  
v)N8vFdd  
void CCaptureDlg::DeleteIcon() S])YU?e  
{ XtRfzqg?K  
 NOTIFYICONDATA data; 12])``9  
 data.cbSize=sizeof(NOTIFYICONDATA); X&0m$x  
 data.hWnd=GetSafeHwnd(); x2ln$dSy7  
 data.uID=98;  wa6DJ  
 Shell_NotifyIcon(NIM_DELETE,&data); l"p%]\tZ  
 ShowWindow(SW_SHOW); eC%.xu^  
 SetForegroundWindow(); %4Ylq|d  
 ShowWindow(SW_SHOWNORMAL); F'lG=c3N  
 bTray=FALSE; =<s+cM  
} \K9XG/XIx  
=L{lt9qQz  
void CCaptureDlg::OnChange() )fP ,F(  
{ N6=cqUM wt  
 RegisterHotkey(); B9KY$^J  
} 1 h|cr_  
 7=0uG  
BOOL CCaptureDlg::RegisterHotkey() I >k3X~cG  
{ :T" !6;  
 UpdateData(); [4]lAxrRF  
 UCHAR mask=0; )TJz'J\*  
 UCHAR key=0; a8rsF  
 if(m_bControl) 8kXbyKX[b  
  mask|=4; cveTrY}g  
 if(m_bAlt) ,WR$xi.j  
  mask|=2; LTG#nM0  
 if(m_bShift) St-:+=V_  
  mask|=1; 5(q\x(N  
  key=Key_Table[m_Key.GetCurSel()]; ePa:_?(  
 if(bRegistered){ FVMR9~&+  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 8)ZWR3)+W  
  bRegistered=FALSE; -20o%t  
 } p<Wb^BE  
 cMask=mask; xY(+[T!OF  
 cKey=key; K~z*P 0g*  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); iaQ[}'6!$  
 return bRegistered; Z^`&Z3s  
} :k6|-A2  
A3*ti!X<6  
  四、小结 !I-+wc{ss  
F#7ZR*ZB1  
  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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