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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: 8L,i}hIo.  
  9/4Bx!~A  
  一、实现方法 K91.-k3)$  
>n6yKcjY]  
  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: WG(%Pkowv  
u{(-`Al}L  
#pragma data_seg("shareddata") "bk'#?9  
HHOOK hHook =NULL; //钩子句柄 VQ'DNv| 9  
UINT nHookCount =0; //挂接的程序数目 h$I 2T  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 707-iLkt.1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 jjU("b=  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey NiO|Aki{  
static int KeyCount =0; )@\m0bnF  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 X0Z r?$q  
#pragma data_seg() UWW_[dJr   
hwB>@r2  
  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。 M$+2f.(>k)  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: B4ky%gF4  
8jm\/?k|  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR M,/{53  
cKey,UCHAR cMask) =3<@{^Eg  
{ N[8y+2SZ  
 BOOL bAdded=FALSE; [" nDw<U  
 for(int index=0;index<MAX_KEY;index++){ O/bpm-h`8c  
  if(hCallWnd[index]==0){ ]Q*eCt;l"K  
   hCallWnd[index]=hWnd; Sp^jC Xu  
   HotKey[index]=cKey; ZX03FJL7u  
   HotKeyMask[index]=cMask; }5a$Ka-  
   bAdded=TRUE; u|uPvbM  
   KeyCount++; `6 `oLu\l  
   break; >2@ a\  
  } KvfZj  
 } N77EM  
 return bAdded; $][$ e  
} QP0[  
//删除热键 " H; i Av  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +Rb0:r>kU  
{ ju%t'u\'  
 BOOL bRemoved=FALSE; P},d`4Ty@  
 for(int index=0;index<MAX_KEY;index++){ {fAj*,pzl  
  if(hCallWnd[index]==hWnd){ 4KCJ(<p|  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Ceco^Mw  
    hCallWnd[index]=NULL; (b4;c=<[{  
    HotKey[index]=0; @gHWU>k,A  
    HotKeyMask[index]=0; z 8\;XR  
    bRemoved=TRUE; U2)y fhI  
    KeyCount--; >Pw ZHY  
    break; \`$RY')9|!  
   } ~lB:xVzn  
  } R6/vhze4L2  
 } 'q9='TOk  
 return bRemoved; RmcQGQ  
} K^fH:pV  
-+w^"RBV  
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  DLL中的钩子函数如下: DV">9{"5']  
a54qv^IS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5Sfz0  
{ KD)+& 69  
 BOOL bProcessed=FALSE; N0 F|r8xS  
 if(HC_ACTION==nCode) |jwN8@  
 { p.J+~s4G  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 {9yW8&m  
   switch(wParam) Z2wgfP`  
   {  A3=$I&!%  
    case VK_MENU: t:<dirw,o  
     MaskBits&=~ALTBIT; f*Dy>sw  
     break; |)\{Rufb  
    case VK_CONTROL: .<|.nK`6  
     MaskBits&=~CTRLBIT; 9Di@r!Db  
     break; Lavm  
    case VK_SHIFT: b&~s}IX   
     MaskBits&=~SHIFTBIT; u"*Wo'3I|  
     break; h,WF'X+  
    default: //judge the key and send message }9,^=g-  
     break; A/+bwCDP  
   } _]~= Kjp  
   for(int index=0;index<MAX_KEY;index++){ ;mYj`/Yj  
    if(hCallWnd[index]==NULL) c _faW  
     continue; "Ooc;xD3<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) />E:}1}{  
    { Wu9))Ir  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 3Az7urIY  
     bProcessed=TRUE; k yI-nE  
    } Rh.CnCbM  
   } 5,n{-V  
  } m:A1wL4c6  
  else if((lParam&0xc000ffff)==1){ //有键按下 hB:}0@l6p=  
   switch(wParam) 9V5d=^  
   { GDMg.w 4Yk  
    case VK_MENU: U`h>[9  
     MaskBits|=ALTBIT; b08s610fk  
     break; x!@P|c1nKC  
    case VK_CONTROL: "/MA.zEl0,  
     MaskBits|=CTRLBIT; v1Wz#oP  
     break; PWw2;3`-6w  
    case VK_SHIFT: /5Zt4&r  
     MaskBits|=SHIFTBIT; E0Neo _7  
     break;  !Hp H  
    default: //judge the key and send message !^EdB}@yS  
     break; ]@D#<[5\  
   } %Z#s9QC  
   for(int index=0;index<MAX_KEY;index++){ |#6))Dh  
    if(hCallWnd[index]==NULL) g.re`m|Aj  
     continue; 'eRJQ*0F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %Qc5_of  
    { #^FDFl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); m2o)/:  
     bProcessed=TRUE;  T.{sO`  
    } 'QrvkQ  
   } 861!p%y5  
  } _:Jra  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 n6f  
   for(int index=0;index<MAX_KEY;index++){ 5sc`L  
    if(hCallWnd[index]==NULL) S`qa_yI)Ed  
     continue; n,E =eNc  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) uK5&HdoM  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Q-:IE T  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 +g6t)Gl  
   } W$X@DXT=o  
  } rL=_z^.P  
 } |d B`URP  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); N3`EJY_|V  
} _ Db05:r@  
keYvscRBI  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: +9[/> JM  
f;w7YO+$p9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^*fZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xc HG5bg |  
ojA i2uz  
  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: 10 D6fkjf  
GvCB3z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8 FqhSzw  
{ RTgR>qI&)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) %di]1vQ  
 { S|pMX87R  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 \~:Uj~  
  SaveBmp(); ]S=AO/'  
  return FALSE; !k= ~5)x  
 } TL?(0]H fe  
 …… //其它处理及默认处理 2unaK<1s  
} MzY~-74aF  
z+Cw*v\Y  
 d Xiv8B1  
  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。 xp4w9.X5(  
APC,p,"  
  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。 BV8-\R@  
?1G7=R  
  二、编程步骤 79?%g=#=  
EMV<PshW=  
  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"; w!=Fi  
p? dXs^ c  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; *+-L`b{SX  
EPZ^I)  
  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; FccT@ ,.F  
.[ E"Kb}=  
  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; D]s8w  
x'.OLXx>  
  5、 添加代码,编译运行程序。 p..O;_U  
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三、程序代码 .)zX<~,  
9b/7~w.  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL )tRqt9Th*  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) sU/R$Nbr  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ |Mm9QF;iA  
#if _MSC_VER > 1000 H</Mh*Fl2G  
#pragma once 99\;jz7  
#endif // _MSC_VER > 1000 ^zMME*G  
#ifndef __AFXWIN_H__ A@W/  
#error include 'stdafx.h' before including this file for PCH /ox9m7Fz7  
#endif QBNnvg4v  
#include "resource.h" // main symbols b~1]}9TJ  
class CHookApp : public CWinApp g@va@*|~d  
{ 0!:1o61  
 public: &7{/ x~S{  
  CHookApp(); _msV3JBr  
  // Overrides oj6b33z  
  // ClassWizard generated virtual function overrides  !IZbMn6  
  //{{AFX_VIRTUAL(CHookApp) PMdvBOtS`  
 public: ?3{R'Buv]  
  virtual BOOL InitInstance(); lO)0p2  
  virtual int ExitInstance(); :< )"G&  
  //}}AFX_VIRTUAL q]-CTx$  
  //{{AFX_MSG(CHookApp) }w#Ek=,s#o  
  // NOTE - the ClassWizard will add and remove member functions here. p;GT[Ds^  
  // DO NOT EDIT what you see in these blocks of generated code ! d"1DE  
  //}}AFX_MSG 4@qKML  
  DECLARE_MESSAGE_MAP() .)7r /1o  
}; ?9_RI(a.}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); LxM.z1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6evW O!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); R3G+tE/Y  
BOOL InitHotkey(); |HjoaN)  
BOOL UnInit(); `ehZ(H}  
#endif < O5r|  
,Tb~+z|-[  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ?HP54G<{xz  
#include "stdafx.h" ],fu#pi=]  
#include "hook.h" QJcaOXyMS  
#include <windowsx.h> Tr^Egw]  
#ifdef _DEBUG T[z]~MJL  
#define new DEBUG_NEW ;>eD`Wh  
#undef THIS_FILE 3 e19l!B  
static char THIS_FILE[] = __FILE__; 6hE. i x  
#endif PP{CK4  
#define MAX_KEY 100 =1JS6~CTLN  
#define CTRLBIT 0x04 t Z_ni}  
#define ALTBIT 0x02 sg.8Sd"]7  
#define SHIFTBIT 0x01 Gj~1eS  
#pragma data_seg("shareddata") 8>E_bxC  
HHOOK hHook =NULL; Z$0+jpG_s  
UINT nHookCount =0; 0g-bApxz*&  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey %~V+wqu  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT V-y"@0%1  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 9(9+h]h+3  
static int KeyCount =0; .%.kEJh`  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift JJ50(h)U  
#pragma data_seg() ]%{.zl!  
HINSTANCE hins; GwOn&EpY!  
void VerifyWindow(); BEQ$p) h  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) X>[x7t:  
//{{AFX_MSG_MAP(CHookApp) ZfpV=DU  
// NOTE - the ClassWizard will add and remove mapping macros here. p)t1] <,Of  
// DO NOT EDIT what you see in these blocks of generated code! _h% :Tu  
//}}AFX_MSG_MAP BZ]6W/0  
END_MESSAGE_MAP() !besMZ  
;B35E!QJ  
CHookApp::CHookApp() re\@v8w~  
{ LqH<HGMFD  
 // TODO: add construction code here, 2k }:)]m  
 // Place all significant initialization in InitInstance ^4+ew>BLSv  
} `5[$8;  
Q^&oXM'x/i  
CHookApp theApp; B?Vr9H7n  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) S~ dD;R  
{ KjrUTG0oA  
 BOOL bProcessed=FALSE; #Ub"Ii  
 if(HC_ACTION==nCode) wD|3Czc  
 { *4i)aj  
  if((lParam&0xc0000000)==0xc0000000){// Key up Zu4|1 W  
   switch(wParam) L|y4u;-Q  
   { |WopsV %  
    case VK_MENU: pjC2jlwm*  
     MaskBits&=~ALTBIT; b7 pD#v  
     break; 1]yOC)u"i  
    case VK_CONTROL: >-2eZ(n)"  
     MaskBits&=~CTRLBIT; [79 eq=  
     break; (,5oqU9s@  
    case VK_SHIFT: Mp*S+Plp  
     MaskBits&=~SHIFTBIT; Wc}opp  
     break; xiu?BP?V  
    default: //judge the key and send message b`NXe7A  
     break; jV(\]g"/=  
   } >&@hm4  
   for(int index=0;index<MAX_KEY;index++){ `1cGb*b/  
    if(hCallWnd[index]==NULL) p2c4 <f-M  
     continue; 3:">]LMi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) } {! #` 's  
    { [0_JS2KE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `EV" /&`  
     bProcessed=TRUE; a@|/D\C  
    } 9Tgl/}q)  
   } /5:f[-\s  
  } i+/:^tc;  
  else if((lParam&0xc000ffff)==1){ //Key down U({20  
   switch(wParam) H-?wEMi)*u  
   { h'i8o>7  
    case VK_MENU: 9;Z2.P"w  
     MaskBits|=ALTBIT; 63s<U/N  
     break; +N161vo7  
    case VK_CONTROL: ?[$=5?  
     MaskBits|=CTRLBIT;  0p8Z l  
     break; uCA! L)$  
    case VK_SHIFT: a,o>E4#c  
     MaskBits|=SHIFTBIT; |4UU`J9M  
     break; }pE8G#O&  
    default: //judge the key and send message \htL\m^$9  
     break; K !X>k  
   }  R^%uEP  
   for(int index=0;index<MAX_KEY;index++) *cjH]MQ0Ak  
   {  u/ Os  
    if(hCallWnd[index]==NULL) ~c e?xr|  
     continue; [C GFzxz$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U6hT*126  
    { ]dXHjOpA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); rsbd DTy  
     bProcessed=TRUE; x+kP,v  
    } -ff|Xxar{  
   } -{Lc?=  
  } kI|Vv90l  
  if(!bProcessed){ FiTP-~  
   for(int index=0;index<MAX_KEY;index++){ <O`yM2/pS  
    if(hCallWnd[index]==NULL) M7Pvc%\)  
     continue; VZOf|o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) R3MbTg  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Km~\^(a '  
   } ya81z4?  
  } 3pxm0|  
 } sZ,MNF8i  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _n.2'  
} "W_C%elg  
_1z|QC  
BOOL InitHotkey() 4dDDi,)U  
{ =F!DwaZ  
 if(hHook!=NULL){ u3!aKXnv<  
  nHookCount++; ^y.e Fz  
  return TRUE; &&iZ?JteZ  
 } 8\Y/?$on  
 else F&{RP>  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); S ("Zzq`  
  if(hHook!=NULL) Vb|;@*=R&Q  
   nHookCount++; ^wL n  
  return (hHook!=NULL); )4d)G5{  
} DRldRm/  
BOOL UnInit() j8@ Eqh  
{ RU>Hr5ebo  
 if(nHookCount>1){ ap;tggi(H  
  nHookCount--; Qm| Q0u   
  return TRUE; >*xa\ve  
 } }*!7 Vrep  
 BOOL unhooked = UnhookWindowsHookEx(hHook); j1!P:(  
 if(unhooked==TRUE){ b8V]/  
  nHookCount=0; :Zy7h7P,lT  
  hHook=NULL; -+1it  
 } ^*7~ Wxk5  
 return unhooked; S~"1q 0  
} 32_{nLV$[  
ILt95l  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) zl>l.zJ  
{ #;bpxz1lR9  
 BOOL bAdded=FALSE; qp(F}@  
 for(int index=0;index<MAX_KEY;index++){ *}9i@DP1,  
  if(hCallWnd[index]==0){ q&IO9/[dk  
   hCallWnd[index]=hWnd; xO2S|DH{  
   HotKey[index]=cKey; Mis t,H7  
   HotKeyMask[index]=cMask; 2#4_ /5(j*  
   bAdded=TRUE; 0A%>'<  
   KeyCount++; Gt&x<  
   break; o.tCw\M$g  
  } 0B(<I?a/  
 } tuA,t  
 return bAdded; NI eKS_ +  
} Lc>9[! +#  
;!<WL@C~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I*e8 5wef  
{ G Q&9b_  
 BOOL bRemoved=FALSE; r`]&{0}23  
 for(int index=0;index<MAX_KEY;index++){ K 7)1wiEj  
  if(hCallWnd[index]==hWnd){ 0G/VbS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _(J7^rN  
    hCallWnd[index]=NULL; {mPalo A  
    HotKey[index]=0; }?,Gn]]  
    HotKeyMask[index]=0; I At;?4  
    bRemoved=TRUE; ?^i$} .%W  
    KeyCount--; g-=)RIwm  
    break; tt=?*n  
   } ~Mv@Bl  
  } 6KiI3%y?0  
 } Xtqjx@ye  
 return bRemoved; T ,, Ao36  
} DPvM|n`TW  
Bcx-t)[  
void VerifyWindow() n{F$,a  
{ ~mc7O  
 for(int i=0;i<MAX_KEY;i++){ ?3!"js B  
  if(hCallWnd!=NULL){ iw6qNV:\Z  
   if(!IsWindow(hCallWnd)){ @%L4^ms  
    hCallWnd=NULL; daT[2M  
    HotKey=0; kBY54pl  
    HotKeyMask=0; DG8LoWZ  
    KeyCount--; ! /Z{uy  
   } = GirUW D  
  } I__|+%oC  
 } ag^L' h$  
} mj0{Nd  
N9r}nqCN  
BOOL CHookApp::InitInstance() -k{n"9a9?  
{ >_QC_UX>4i  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); qu[ ~#  
 hins=AfxGetInstanceHandle(); Gx ?p,Fj  
 InitHotkey(); q/xMM `{  
 return CWinApp::InitInstance(); RQI?\?o  
} !dB {E  
:8}QKp  
int CHookApp::ExitInstance() *D ld?Q  
{ f[3DKA  
 VerifyWindow(); ;aBK4<-vl  
 UnInit(); `r+"2.z*  
 return CWinApp::ExitInstance(); 27*u^N*z@  
} jw$3cwddH  
4C^;lK  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file P"0S94o:5J  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) V,bfD3S3  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ THirh6  
#if _MSC_VER > 1000 b:.aZ7+4  
#pragma once &eV& +j  
#endif // _MSC_VER > 1000 W)jO 4,eO  
SU OuayE  
class CCaptureDlg : public CDialog &Zl$7  
{ $:"r$7  
 // Construction SU;PmG4  
 public: <v;;:RB6c  
  BOOL bTray; I*R[8|  
  BOOL bRegistered; FjIS:9^)t5  
  BOOL RegisterHotkey(); Z~{0XG\Y  
  UCHAR cKey; 2g1[ E_?  
  UCHAR cMask; /5 Wy) -  
  void DeleteIcon(); a'w~7y!}  
  void AddIcon(); R6HMi#eF  
  UINT nCount; <}-[9fW  
  void SaveBmp(); y0qrl4S)v  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 9Vz1*4Ln  
  // Dialog Data h)BRSs?v_D  
  //{{AFX_DATA(CCaptureDlg) Q[^IX  
  enum { IDD = IDD_CAPTURE_DIALOG }; b:/;  
  CComboBox m_Key; N+x0"~T}I  
  BOOL m_bControl; 7''l\3mIn  
  BOOL m_bAlt; kH1hsDe|&y  
  BOOL m_bShift; ";38v jIV  
  CString m_Path; 1g6AzUXg  
  CString m_Number; 9;s:Bo  
  //}}AFX_DATA v5l)T}Nb  
  // ClassWizard generated virtual function overrides obRR))  
  //{{AFX_VIRTUAL(CCaptureDlg) *]~ug%a  
 public: tVd\r"0k  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 2yR*<yj  
 protected: + 8 5]]}I  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2<wuzP|  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -}0S%|#m  
  //}}AFX_VIRTUAL ?ix--?jl  
  // Implementation -frmvNJ F  
 protected: ARAC'F0  
  HICON m_hIcon; FR9qW$B  
  // Generated message map functions R%o:'-~  
  //{{AFX_MSG(CCaptureDlg) ;4tVFqR  
  virtual BOOL OnInitDialog(); +[*VU2f t  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %o9@[o .]  
  afx_msg void OnPaint(); `E>HpRcxD  
  afx_msg HCURSOR OnQueryDragIcon(); L<!}!v5ja  
  virtual void OnCancel(); :#58m0YLA:  
  afx_msg void OnAbout(); V{;!vt~  
  afx_msg void OnBrowse(); Xu`c_  
  afx_msg void OnChange(); Mit,X  
 //}}AFX_MSG V %'`nJ!  
 DECLARE_MESSAGE_MAP() pDb5t>  
}; 'gk.J  
#endif B PTQm4TN  
W-q2|NK  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file G$pTTT6#  
#include "stdafx.h" $,q~q^0  
#include "Capture.h" Htn=h~U`z  
#include "CaptureDlg.h" ?>5[~rMn  
#include <windowsx.h> GqumH/;  
#pragma comment(lib,"hook.lib") i`/_^Fndyu  
#ifdef _DEBUG q\ FF)H  
#define new DEBUG_NEW ES!$JWK|  
#undef THIS_FILE / PG+ s6  
static char THIS_FILE[] = __FILE__; =3OK 3|  
#endif QU^*(HGip  
#define IDM_SHELL WM_USER+1 r#iZ FL3q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Jm$. $B&I  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }]_/:KUt  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; aAZS^S4v  
class CAboutDlg : public CDialog r=P)iE:  
{ l T~RH0L  
 public: fyPpzA0  
  CAboutDlg(); ^I03PIy0l  
  // Dialog Data 9Z]~c^UB  
  //{{AFX_DATA(CAboutDlg) ~K}iVX  
  enum { IDD = IDD_ABOUTBOX }; $2qZds[  
  //}}AFX_DATA R06L4,/b  
  // ClassWizard generated virtual function overrides )I'?]p<  
  //{{AFX_VIRTUAL(CAboutDlg) C( 8i0(1  
 protected: '^ bB+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support t!Q uM_i3  
  //}}AFX_VIRTUAL jY%&G#4  
  // Implementation 6nh!g  
 protected: |niYN7 17  
  //{{AFX_MSG(CAboutDlg) B*7Y5_N  
  //}}AFX_MSG GL$!JKWp  
  DECLARE_MESSAGE_MAP() c7 Sa|9*dR  
}; j78WPG  
&v|Uy}h&%1  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) uc!j`G*]  
{ S9R(;  
 //{{AFX_DATA_INIT(CAboutDlg) fe PH=C  
 //}}AFX_DATA_INIT X.hU23w  
} :)VO,b~r  
$Llv6<B  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) -SZXUN  
{ yG\^PD  
 CDialog::DoDataExchange(pDX); wqB{cr}!  
 //{{AFX_DATA_MAP(CAboutDlg) f =@'F=  
 //}}AFX_DATA_MAP P8!ON=  
} stuj,8  
>QO^h<.>  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) eygmhaE  
 //{{AFX_MSG_MAP(CAboutDlg) +\g/KbV7  
 // No message handlers X{4jyi-<  
 //}}AFX_MSG_MAP /a.4atb0  
END_MESSAGE_MAP() |f), dC  
|U{9Yy6p  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) F: %-x=q  
: CDialog(CCaptureDlg::IDD, pParent) l?pF?({  
{ lM1~ K  
 //{{AFX_DATA_INIT(CCaptureDlg) cb!mV5M-g  
  m_bControl = FALSE; TI4#A E  
  m_bAlt = FALSE; ,5oe8\uz  
  m_bShift = FALSE; CXt9 5O?  
  m_Path = _T("c:\\"); %@tKcQ  
  m_Number = _T("0 picture captured."); O ]o7  
  nCount=0; MB.\G.bV  
  bRegistered=FALSE; O b'B?  
  bTray=FALSE; ]-[M&i=+&  
 //}}AFX_DATA_INIT :5Vk+s]8  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32  [U9b_`  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); xi['knUi2-  
} -^sW{s0Rc  
`roos<F1D  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) < kyT{[e+6  
{ Zjqa n  
 CDialog::DoDataExchange(pDX); )!6JSMS  
 //{{AFX_DATA_MAP(CCaptureDlg) ro|mW P0  
  DDX_Control(pDX, IDC_KEY, m_Key); -]""Jl^  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Zjis0a]v~k  
  DDX_Check(pDX, IDC_ALT, m_bAlt); (:9yeP1  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); k(LZ,WSR  
  DDX_Text(pDX, IDC_PATH, m_Path); {!!df.h  
  DDX_Text(pDX, IDC_NUMBER, m_Number); E;!pK9wL|  
 //}}AFX_DATA_MAP $A~UA  
} zVN/|[KP4  
DfYOGs]@  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 3ARvSz@5  
//{{AFX_MSG_MAP(CCaptureDlg) Gk_%WY*  
 ON_WM_SYSCOMMAND() Z] ?Tx2|7  
 ON_WM_PAINT() N(i%Oxp1  
 ON_WM_QUERYDRAGICON() q#LB 2M  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) >[t0a"  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ^u'hl$`^  
 ON_BN_CLICKED(ID_CHANGE, OnChange) "XPBNv\>_  
//}}AFX_MSG_MAP ,b[}22  
END_MESSAGE_MAP() $!Z><&^/  
l-s%3E3  
BOOL CCaptureDlg::OnInitDialog() PPoQNW  
{ k=;>*:D%  
 CDialog::OnInitDialog(); ;:<z hO  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); kc*zP=  
 ASSERT(IDM_ABOUTBOX < 0xF000); )Z6bMAb0'N  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ZEY="pf  
 if (pSysMenu != NULL) TljN!nv]  
 { *u LOoq  
  CString strAboutMenu; k(hYNmmo j  
  strAboutMenu.LoadString(IDS_ABOUTBOX); YywiY).]@  
  if (!strAboutMenu.IsEmpty()) WMy97*L<  
  { + *u'vt?  
   pSysMenu->AppendMenu(MF_SEPARATOR); 590.mCm  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 3On IAk3  
  } <Jt H/oN  
 } OAigq6[,  
 SetIcon(m_hIcon, TRUE); // Set big icon Zop3[-  
 SetIcon(m_hIcon, FALSE); // Set small icon x)evjX=q  
 m_Key.SetCurSel(0); A8,9^cQ]  
 RegisterHotkey(); M)v\7a  
 CMenu* pMenu=GetSystemMenu(FALSE); n(X{|?  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "FuOWI{in  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 2P\k;T(  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); hxG=g6:G  
 return TRUE; // return TRUE unless you set the focus to a control V|6PKED  
} +'fy%/  
w Vegr  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 0|6]ps4Z7  
{ ~K'e}<-G  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) feJzX*u  
 { 9Z?P/ o  
  CAboutDlg dlgAbout; 7D'-^#S5  
  dlgAbout.DoModal(); /#mq*kNIM6  
 } .II*wK k  
 else { 'A`ram  
 { 'iQ  
  CDialog::OnSysCommand(nID, lParam); &d,chb (  
 } ~nit~ ;  
} `As| MYv  
D$ X9xtT  
void CCaptureDlg::OnPaint() :LE0_ .  
{ lKVy{X 3]*  
 if (IsIconic()) nsT]Yxo%M  
 { 6yDj1PI  
  CPaintDC dc(this); // device context for painting ,m4M39MWJ  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); JA]TO (x  
  // Center icon in client rectangle 0!4;."S  
  int cxIcon = GetSystemMetrics(SM_CXICON); G.j  R  
  int cyIcon = GetSystemMetrics(SM_CYICON); '5^$v{  
  CRect rect; g/*x;d=  
  GetClientRect(&rect); m(2(Caz{  
  int x = (rect.Width() - cxIcon + 1) / 2; 6d4e~F  
  int y = (rect.Height() - cyIcon + 1) / 2;  Om%HrT  
  // Draw the icon 9NUft8QB  
  dc.DrawIcon(x, y, m_hIcon); \R"}=7  
 } 'K|Jg.2  
 else k8>(-W"A  
 { 4)]w"z0Pc  
  CDialog::OnPaint(); (I<]@7>  
 } $? 'JePC  
} '*4>&V.yX  
,/m@<NyK  
HCURSOR CCaptureDlg::OnQueryDragIcon() "h@|XI  
{ qcN{p7=0  
 return (HCURSOR) m_hIcon; ] lBe   
} ~* R:UTBtw  
s,5SWdb\v  
void CCaptureDlg::OnCancel()  (~59}lu~  
{ :S['hBMN  
 if(bTray) Z>897>  
  DeleteIcon(); OO7sj@  
  CDialog::OnCancel(); 7!-3jU@m  
} kzky{0yKk=  
Fe:M'.  
void CCaptureDlg::OnAbout() Cx N]fo  
{ 2/*F}w/  
 CAboutDlg dlg; #9R[%R7Nz  
 dlg.DoModal(); 5,Q3#f~!  
} <V> [H7  
rwZI;t$hf  
void CCaptureDlg::OnBrowse() tQ:g#EqL9B  
{ tVAWc$3T  
 CString str; ;f]p`!] 3  
 BROWSEINFO bi; h;q= <[h\  
 char name[MAX_PATH]; m=s aUhI*9  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); {"^LUw8fd  
 bi.hwndOwner=GetSafeHwnd(); q+j.)e  
 bi.pszDisplayName=name; \IL;}D{  
 bi.lpszTitle="Select folder"; fPW|)e"  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ujlIWQU2mo  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); $`KddW0_  
 if(idl==NULL) Mx-? &  
  return; ,H_b@$]n8  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 7m4gGkX#r  
 str.ReleaseBuffer(); 4yZ'+\ +I  
 m_Path=str; s!lLdR[g  
 if(str.GetAt(str.GetLength()-1)!='\\') %NyV 2W=~X  
  m_Path+="\\"; 3CKd[=-Z  
 UpdateData(FALSE); rL kUIG  
} 9EPE.+ns  
v jTs[eq>  
void CCaptureDlg::SaveBmp() YsX&]4vzm  
{ 2yB@)?V/  
 CDC dc; 5hhiP2q  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); p"xti+2,  
 CBitmap bm; o {W4@:Ib  
 int Width=GetSystemMetrics(SM_CXSCREEN); R*"31&3le4  
 int Height=GetSystemMetrics(SM_CYSCREEN); OpNTyKbaD  
 bm.CreateCompatibleBitmap(&dc,Width,Height); S":55YQev!  
 CDC tdc; #!A'6SgbkM  
 tdc.CreateCompatibleDC(&dc); qw#wZ'<n  
 CBitmap*pOld=tdc.SelectObject(&bm); <yoCW?#  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); FW~{io]n  
 tdc.SelectObject(pOld); .Mn_T*F  
 BITMAP btm; z~O#0Q !  
 bm.GetBitmap(&btm); )td?t.4  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; # NoY}*  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); AX`>y@I  
 BITMAPINFOHEADER bih; 8+7n"6GY2/  
 bih.biBitCount=btm.bmBitsPixel; tQrF A2F  
 bih.biClrImportant=0; .C 6wsmQ  
 bih.biClrUsed=0; @Cnn8Y&'  
 bih.biCompression=0; }3b3^f  
 bih.biHeight=btm.bmHeight; !Q/%N#  
 bih.biPlanes=1; s8r|48I#;  
 bih.biSize=sizeof(BITMAPINFOHEADER); G{ |0}  
 bih.biSizeImage=size; /Zzb7bHLK  
 bih.biWidth=btm.bmWidth; [!g$|   
 bih.biXPelsPerMeter=0; iXF iFsb  
 bih.biYPelsPerMeter=0; bNH72gX2Yh  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); tom1u>1n  
 static int filecount=0; P' ";L6h  
 CString name; @]{+9m8G@  
 name.Format("pict%04d.bmp",filecount++); IIZu&iZo\  
 name=m_Path+name; wsfN \6e  
 BITMAPFILEHEADER bfh; zL^`r)H  
 bfh.bfReserved1=bfh.bfReserved2=0; Kyr3)1#J  
 bfh.bfType=((WORD)('M'<< 8)|'B'); O_E\(So  
 bfh.bfSize=54+size; 6~oo.6bA  
 bfh.bfOffBits=54; W[$GB_A)  
 CFile bf; =DL |Q  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ =&!L&M<<  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )=k8W9i8b  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); %Voq"}}N  
  bf.WriteHuge(lpData,size); Y=NXfTc  
  bf.Close(); ;Dw6pmZ  
  nCount++; l[,RA?i {  
 } `<?{%ja  
 GlobalFreePtr(lpData); (TX\vI&  
 if(nCount==1) u|.c?fW'3  
  m_Number.Format("%d picture captured.",nCount); EgYM][:UU  
 else M0B6v} ^H  
  m_Number.Format("%d pictures captured.",nCount); LH:M`\(DL1  
  UpdateData(FALSE); tx+KxOt9Y  
} A^%li^qz  
2 cB){.E  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) <n+]\a97*  
{ x5X;^.1Fr  
 if(pMsg -> message == WM_KEYDOWN) >qqI6@h]c  
 { Juhi#&`T  
  if(pMsg -> wParam == VK_ESCAPE) #1-2)ZO.  
   return TRUE; _EusY3q  
  if(pMsg -> wParam == VK_RETURN) |}FK;@'I6  
   return TRUE; 8E/wUN,Lxj  
 } Au=9<WB%H  
 return CDialog::PreTranslateMessage(pMsg); Q#h*C ZT  
} zXEu3h  
u%s@B1j  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) y8HwyU>  
{ K3;lst>4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ rUz-\H(-  
  SaveBmp(); doX8Tq   
  return FALSE; FX yyY-(O  
} 2 &(w\#'  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ sC< B  
 CMenu pop; }C'H@:/  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); nt5x[xa  
 CMenu*pMenu=pop.GetSubMenu(0); m|CB')  
 pMenu->SetDefaultItem(ID_EXITICON); u2FD@Xq?  
 CPoint pt; 0afDqvrC6  
 GetCursorPos(&pt); z_ 01*O  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); CyWMr/'  
 if(id==ID_EXITICON) $:4* ?8 K2  
  DeleteIcon(); {hNvCk  
 else if(id==ID_EXIT) (C&Lpt_  
  OnCancel(); %XQ!>BeE  
 return FALSE; d3IMQ_k  
} 1KI,/H"SY  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); yu~o9  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) AeZ__X  
 AddIcon(); /uNgftj  
 return res; W5f|#{&L:  
} ~vGX(8N  
T'K6Q cu  
void CCaptureDlg::AddIcon() $;V?xZm[  
{ 5;alq]m7  
 NOTIFYICONDATA data; )5j1;A:gr  
 data.cbSize=sizeof(NOTIFYICONDATA); h(>eHP  
 CString tip; P<OSm*;U:  
 tip.LoadString(IDS_ICONTIP); f ecV[  
 data.hIcon=GetIcon(0); 7gx 7NDt  
 data.hWnd=GetSafeHwnd(); qs|{  
 strcpy(data.szTip,tip); k%gO  
 data.uCallbackMessage=IDM_SHELL; O/N@ Gz[g%  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; V~~4<?=A  
 data.uID=98; {!/ha$(  
 Shell_NotifyIcon(NIM_ADD,&data); J}{a&3@Hm  
 ShowWindow(SW_HIDE); C 7a$>#%  
 bTray=TRUE; G9YfJ?I  
} f)b+>!  
Dus [N< w  
void CCaptureDlg::DeleteIcon() 89kxRH\IhG  
{ j{`C|zg  
 NOTIFYICONDATA data; ?nwFc3qw  
 data.cbSize=sizeof(NOTIFYICONDATA); [#3*R_#8R  
 data.hWnd=GetSafeHwnd(); oZ!1^o3V  
 data.uID=98; P\nz;}nv  
 Shell_NotifyIcon(NIM_DELETE,&data); h;lg^zlTb  
 ShowWindow(SW_SHOW); lR8Lfa*/7  
 SetForegroundWindow(); jI;iTKjB(  
 ShowWindow(SW_SHOWNORMAL); Z+%w|Sx  
 bTray=FALSE; dln1JZ!  
} :,f~cdq=  
;dR4a@  
void CCaptureDlg::OnChange() ALO0yc  
{ })#SjFq<V  
 RegisterHotkey(); iL6Yk @  
} ,P.yl~'Al  
$-Yq?:  
BOOL CCaptureDlg::RegisterHotkey() q-lejVS(g  
{ ?r}'0dW  
 UpdateData(); YR? ujN  
 UCHAR mask=0; bZKlQ<sI  
 UCHAR key=0; 6]D%|R,Q#}  
 if(m_bControl) h@H8oZ[  
  mask|=4; IHs^t/;Iv  
 if(m_bAlt) F^/b!)4X  
  mask|=2; f7y3BWOi]  
 if(m_bShift)  L#>^R   
  mask|=1; brpsZU  
  key=Key_Table[m_Key.GetCurSel()]; ;&2f{  
 if(bRegistered){ &$V&gAN  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ;J&p17~T9  
  bRegistered=FALSE; #=81`u  
 } ]aDU*tk  
 cMask=mask; ?\.DG`Zxc  
 cKey=key; D00v"yp%%  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); K K_  
 return bRegistered; %0MvCm  
} oj'a%mx  
=mQdM]A)2  
  四、小结 )%6h9xyXt  
~#SLb=K   
  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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