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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: -k2|`t _  
  D^p)`*  
  一、实现方法 &%)F5PT  
:f_oN3F p  
  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: 0yMHU[):~  
%z-so?gF  
#pragma data_seg("shareddata") f w)tWJVD  
HHOOK hHook =NULL; //钩子句柄 ]c|JxgU  
UINT nHookCount =0; //挂接的程序数目 VQ2'a/s  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 GiK,+M"d  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 08k  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey '"LaaTTs  
static int KeyCount =0; &m9= q|;m  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 BXxJra/V  
#pragma data_seg() xb9^WvV  
(Nd)$Oq[4  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 K)[\IJJM  
kVt/Hhd9  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: <HS{A$]  
=`N 0  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR U#w0E G  
cKey,UCHAR cMask) )$a6l8  
{ EKN<KnU%  
 BOOL bAdded=FALSE; K&gE4;>  
 for(int index=0;index<MAX_KEY;index++){ $83Qd  
  if(hCallWnd[index]==0){ /P46k4M1U  
   hCallWnd[index]=hWnd; ,VUOsNN4\  
   HotKey[index]=cKey; ux6)K= ]  
   HotKeyMask[index]=cMask; -*ZQ=nomN  
   bAdded=TRUE; xdaq` ^Bbt  
   KeyCount++; /n$R-Q  
   break; P%Q'w  
  } HB*BL+S06  
 } 'Ce?!U O  
 return bAdded; d$E>bo-\   
} 0a@tPskV  
//删除热键 Ky8,HdAq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $/(``8li_  
{ -!M>;M@  
 BOOL bRemoved=FALSE; Q.V@Sawe5  
 for(int index=0;index<MAX_KEY;index++){ nG?Z* n  
  if(hCallWnd[index]==hWnd){ 8NE[L#k  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ H<g8u{ $  
    hCallWnd[index]=NULL; =eDC{/K  
    HotKey[index]=0; u$ o 19n  
    HotKeyMask[index]=0; ;yjw(OAI*  
    bRemoved=TRUE; I*a .!/$)  
    KeyCount--; Ytqx 0  
    break; Hl{ul'o  
   } *&h]PhY  
  } n? =O@yq  
 } cf"!U+x  
 return bRemoved; 4W E)2vkS  
} $ER$|9)KD  
_Vt9ckaA  
e85E+S%  
  DLL中的钩子函数如下: MAX?,- x  
]y$/~(OW  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9ku|w#%I  
{ NQiu>Sg  
 BOOL bProcessed=FALSE; U!BZs Vx  
 if(HC_ACTION==nCode) ,LLx&jS  
 { &Akw V-  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 =W"T=p*j  
   switch(wParam) !kh:zTP  
   {  AxO.adQE%  
    case VK_MENU: qzZ;{>_f  
     MaskBits&=~ALTBIT; wk^$DM/KJ)  
     break;  ggfCfn  
    case VK_CONTROL: c3<H272\  
     MaskBits&=~CTRLBIT; heb{i5el  
     break; !V4(- 8  
    case VK_SHIFT: 5RY-.c4}  
     MaskBits&=~SHIFTBIT; i`}9VaUG  
     break; 7<2^8 `  
    default: //judge the key and send message F`Z?$ 1  
     break; ,#0#1k<Dm  
   } ]]_c3LJ2`  
   for(int index=0;index<MAX_KEY;index++){ dww4o~hO  
    if(hCallWnd[index]==NULL) FS!vnl8`  
     continue; or7l} X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W55kR.X6M  
    { m5P@F@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); n#4T o;CS  
     bProcessed=TRUE; z$/s` |]  
    } /P/0\3TCi  
   } lX 50JJwk  
  } 6aWnj*dF  
  else if((lParam&0xc000ffff)==1){ //有键按下 p"*xye x  
   switch(wParam) cb. -AlqQ  
   { *W 04$N  
    case VK_MENU: lm+s5}*%o  
     MaskBits|=ALTBIT; .H&XP W  
     break; -y$<fu9 e  
    case VK_CONTROL: lx ~C{tl2  
     MaskBits|=CTRLBIT; ys7 Tq+  
     break; y^ st T^  
    case VK_SHIFT: &*Kk> 4  
     MaskBits|=SHIFTBIT; ]2@lyG#<<  
     break; d5=&:cF  
    default: //judge the key and send message Fd%JF#Hk  
     break; T=g2gmo9  
   } i0?/\@gd  
   for(int index=0;index<MAX_KEY;index++){ Y%(8'Ch  
    if(hCallWnd[index]==NULL) Q5 o0!w  
     continue; usi3z9P>n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #nj;F'O](  
    { z\WyL;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); *d 4A3|  
     bProcessed=TRUE; PHH,vO[eO  
    } md/h\o&  
   } 7$R^u7DZ  
  } ,~Lx7 5{  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 M%$- c3x  
   for(int index=0;index<MAX_KEY;index++){ `C^0YGO%  
    if(hCallWnd[index]==NULL) PT4iy<  
     continue; h`p=~u +  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) QUz4 Kt  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); cF"}}c1*M  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 lpbcpB  
   } 4#B 56f8  
  } wkJ@#jD*[  
 } g/w <T+v  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); iBKH\em/  
} LGYg@DR  
%9L+ Q1o  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: _.m|Ml,`{  
6_;n bqY&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [mG!-.ll  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :"K9(XKKU  
fzN?X=  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Ju"c!vu~  
|NWHZo  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ' Yy+^iCus  
{ <(45(6fQ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) bq}`jP~#  
 { #aE>-81SS&  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 .W\x{h  
  SaveBmp(); 'W&ewZH_h  
  return FALSE; \23m*3"W  
 } p@d_Ru  
 …… //其它处理及默认处理 >YcaFnY  
} .kfx\,lgm  
Fc^!="H  
(L W2S;-  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 4S* X=1  
~L_1&q^4!i  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 aR)w~s\6  
wOEc~WOd  
  二、编程步骤 i G%R'/*  
`2M*?.vk  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; }:]CXrdg>  
EO/41O  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; T#&X7!4  
]na$n[T/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; NBw{  
4Q,|7@  
  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; n8z++ T&  
j@/p: fk  
  5、 添加代码,编译运行程序。 @E"lN  
/1xBZf rN  
三、程序代码 A(n3<(O/{Z  
59X XmVg  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Wo5%@C#M  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) H=mFc@fh  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ p?4,YV|#  
#if _MSC_VER > 1000 LMLrH.  
#pragma once 1c*;Lr.K  
#endif // _MSC_VER > 1000 u Vo"_c w  
#ifndef __AFXWIN_H__ Q&w"!N  
#error include 'stdafx.h' before including this file for PCH ?kF? ~\c  
#endif c^z) [  
#include "resource.h" // main symbols qu;$I'Ul%  
class CHookApp : public CWinApp C4 -y%W"P  
{ xiqeKoAD  
 public: Tsdgg?#  
  CHookApp(); Dnd  
  // Overrides MieO1l  
  // ClassWizard generated virtual function overrides j-| !QlB  
  //{{AFX_VIRTUAL(CHookApp) $s"-r9@q  
 public: V \/Qik{h  
  virtual BOOL InitInstance(); PlwM3lrj  
  virtual int ExitInstance(); R%`fd *g  
  //}}AFX_VIRTUAL /RWD\u<l  
  //{{AFX_MSG(CHookApp) 4rpry@1  
  // NOTE - the ClassWizard will add and remove member functions here. SErh"~[  
  // DO NOT EDIT what you see in these blocks of generated code ! 2dDhO  
  //}}AFX_MSG WwxV} ?Cf+  
  DECLARE_MESSAGE_MAP() #S[Y}-]T  
}; UQbk%K2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 02-% B~oP  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); n|B<rx?v  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E,Xl8rC  
BOOL InitHotkey(); j rX`_Y  
BOOL UnInit(); }-Jo9dNs  
#endif B) dG:~  
; FHnu|  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 7t/Y5Qf  
#include "stdafx.h" h\+8eeIl  
#include "hook.h" @S6@pMo,  
#include <windowsx.h> Z1] 4:  
#ifdef _DEBUG #L&/o9|  
#define new DEBUG_NEW ~6+>2|wIS  
#undef THIS_FILE #oN}DP  
static char THIS_FILE[] = __FILE__; e2L>"/  
#endif `$3ktQ$  
#define MAX_KEY 100 3r[ s_Y*  
#define CTRLBIT 0x04 O,#,`2Qc  
#define ALTBIT 0x02 U(%6ny  
#define SHIFTBIT 0x01 J'yCVb)V  
#pragma data_seg("shareddata") {~XAg~  
HHOOK hHook =NULL; E H|L1g  
UINT nHookCount =0; #+$ PD`j  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ,V{Bpr  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT '-3K`[  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey "6v_<t`q"  
static int KeyCount =0; n$E$@  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift w}e_ 17A  
#pragma data_seg() E%a&6W  
HINSTANCE hins; Z/ L%?zH  
void VerifyWindow(); K#VGG,h7Y  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) MeAY\V%G=o  
//{{AFX_MSG_MAP(CHookApp) nQ{~D5y,,  
// NOTE - the ClassWizard will add and remove mapping macros here. /)<kG(Z  
// DO NOT EDIT what you see in these blocks of generated code! >;%LW} %  
//}}AFX_MSG_MAP Y' 5X4Ks|  
END_MESSAGE_MAP() ja(ZJ[<`  
r,Msg&rT  
CHookApp::CHookApp() [Mj5o<k;I  
{ T&}KUX~Q/  
 // TODO: add construction code here, b~(S;1NS'  
 // Place all significant initialization in InitInstance ({D>(xN   
} tvJl&{-OX  
,k(B>O~o  
CHookApp theApp; fUZCP*7>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) (0rcLNk{|  
{ 8G3.bi'q   
 BOOL bProcessed=FALSE; b`f6(6  
 if(HC_ACTION==nCode) lI@Z)~  
 { ;Zn&Nc7  
  if((lParam&0xc0000000)==0xc0000000){// Key up :)FNhx3  
   switch(wParam) :z6?  
   { +]0hSpZ"p  
    case VK_MENU: U /xzl4m6  
     MaskBits&=~ALTBIT; L@f&71  
     break; (!Xb8rV0_  
    case VK_CONTROL: VFm)!'=I  
     MaskBits&=~CTRLBIT; H}(WL+7  
     break; qac:"z'9  
    case VK_SHIFT: XinKG< 3!  
     MaskBits&=~SHIFTBIT; $4og{  
     break; ^s$U n6v[  
    default: //judge the key and send message S"`{ JCW$  
     break; jc@= b:r=  
   } dCLNZq h6  
   for(int index=0;index<MAX_KEY;index++){ /+WC6&  
    if(hCallWnd[index]==NULL) %ofq  
     continue; ,wy;7T>ODd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y@qugQM>  
    { %4BQY>O)@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); w{]B)>! 1W  
     bProcessed=TRUE; @moaa}1  
    } Ak$9\Sl  
   } `S4G+j>u6  
  } 3K/]{ dkD  
  else if((lParam&0xc000ffff)==1){ //Key down dP#7ev]'  
   switch(wParam) gADqIPu]  
   { ad=7FhnIa3  
    case VK_MENU: =`Ky N/  
     MaskBits|=ALTBIT; ,'sDauFn  
     break; 9NZq k  
    case VK_CONTROL: $_e{Zv[  
     MaskBits|=CTRLBIT; rA @|nL{  
     break; jR*iA3LDo  
    case VK_SHIFT: q6x}\$mL  
     MaskBits|=SHIFTBIT; JIc9csr:b  
     break; @ ]42.oP  
    default: //judge the key and send message aJc>"#+ o  
     break; :_+U[k(#  
   } >y!O_@>z  
   for(int index=0;index<MAX_KEY;index++) m |.0$+=  
   { 6F%6]n  
    if(hCallWnd[index]==NULL) $"#M:V @  
     continue; OT"jV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B%o%%A8*g  
    { ?zVcP=p@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); dkSd Y+Q  
     bProcessed=TRUE; F)19cKx7  
    } v[?gM.SF  
   } > :0N)Pj  
  } auM1k]  
  if(!bProcessed){ #W8c)gkG9  
   for(int index=0;index<MAX_KEY;index++){ YF%]%^n  
    if(hCallWnd[index]==NULL) nhd.c2t\  
     continue; vq@"y%C4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %:dd#';g  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;2^zkmDM  
   } 0/cgOP!^  
  } P E[5oH  
 } _ -,[U{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); e$mVA}>Ybp  
} ?Qts2kae#  
W!TT fj   
BOOL InitHotkey() `}8)P#  
{ L$jii  
 if(hHook!=NULL){ `];ne]xM  
  nHookCount++; }R:oWR  
  return TRUE; `[ZA#8Ma  
 } 5cl^:Ua  
 else V=+p8nE0  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); e"Z,!Q^-L  
  if(hHook!=NULL) b'xBPTN  
   nHookCount++; +.$:ZzH#  
  return (hHook!=NULL); 2Ns<lh   
} g1B P  
BOOL UnInit() U<'$ \ P  
{ ]HRHF'4  
 if(nHookCount>1){ tao9icl*`  
  nHookCount--; EAF\ 7J*  
  return TRUE; z,VXH ?.Zo  
 } 77 ?TRC  
 BOOL unhooked = UnhookWindowsHookEx(hHook); sr~VvciIy  
 if(unhooked==TRUE){ % 5BSXAc  
  nHookCount=0; C3 m_sv#e  
  hHook=NULL; P+3 ]g{2w  
 } DG3Mcf@5  
 return unhooked; ADMeOdgca  
} G)""^YB-  
~\%H0.P6  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) U1kW1L}B  
{ nYj7r* e[  
 BOOL bAdded=FALSE; q"-Vh,8h  
 for(int index=0;index<MAX_KEY;index++){ ~fO#En  
  if(hCallWnd[index]==0){ d 5h x%M  
   hCallWnd[index]=hWnd; &3*r-9BZ  
   HotKey[index]=cKey; )F0Q2P1I  
   HotKeyMask[index]=cMask; B\`${O(  
   bAdded=TRUE; cL"Ral-qB  
   KeyCount++; 5+)_d%v=6!  
   break; s2nZW pIy  
  } BpF}H^V-  
 } Y2+YmP*z`  
 return bAdded; va.Ve# N  
} )P.,h&h/  
[c99m:*+  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) sr:hR Q27  
{ \ow(4O#  
 BOOL bRemoved=FALSE; >waA\C}  
 for(int index=0;index<MAX_KEY;index++){ _G)x\K]N  
  if(hCallWnd[index]==hWnd){ -1R7 8(1  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2%]#rZ  
    hCallWnd[index]=NULL; `Cu9y+t  
    HotKey[index]=0; t4-0mNBZt$  
    HotKeyMask[index]=0; fY|vq amA;  
    bRemoved=TRUE; ~\c  j  
    KeyCount--; pFwe&_u]  
    break; AUl[h&s  
   }  ww\2  
  } c>C!vAg  
 } O@rZ ^Aa  
 return bRemoved; vLCm,Bb2L  
} dBW4%Zh  
4_4|2L3  
void VerifyWindow() G2J4N2hu  
{ FWS!b!#,N  
 for(int i=0;i<MAX_KEY;i++){ Ej`G(  
  if(hCallWnd!=NULL){ RLDu5  
   if(!IsWindow(hCallWnd)){ t1aKq)?  
    hCallWnd=NULL; ay=f1<a  
    HotKey=0; #;'*W$Wk2  
    HotKeyMask=0; h:vI:V[/X  
    KeyCount--; y!\q ', F  
   } qmnW  
  } B{1yMJA  
 } 1rh2!4)7  
} cP0(Q+i7  
/{Z<!7u;U  
BOOL CHookApp::InitInstance() 2{L[D9c/6  
{ QmsS,Zljo  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); jgw+c3^R_  
 hins=AfxGetInstanceHandle(); k6_OP]  
 InitHotkey(); 4{" v  
 return CWinApp::InitInstance(); a#3,qp!  
} p vu% p8  
1qwJPM  
int CHookApp::ExitInstance() q4u-mM7#7  
{ _6 yrd.H  
 VerifyWindow(); ~@iYP/=/Q  
 UnInit(); 1 ,6Y)_  
 return CWinApp::ExitInstance(); m=]}Tn  
} * @&V=l  
"6iq_!#L  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file A@w9_qo  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) v<?k$ e5  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ +#g4Crb  
#if _MSC_VER > 1000 x ~@%+d  
#pragma once pz/vvH5  
#endif // _MSC_VER > 1000 Ak2Vf0Eb  
?&.Eg^a"  
class CCaptureDlg : public CDialog hHsO?([99  
{ &s&Ha{(!w  
 // Construction SS-7y:6y>  
 public: iP?=5j=4  
  BOOL bTray; p2 m`pT  
  BOOL bRegistered; 4eS(dPI0  
  BOOL RegisterHotkey(); |C\XU5}  
  UCHAR cKey; QWK\6  
  UCHAR cMask; }h\]0'S~J~  
  void DeleteIcon(); L$f:D2Ei  
  void AddIcon(); e&=T`  
  UINT nCount; 5U/C 0{6  
  void SaveBmp(); p%CcD]o  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor y~+U(-&.  
  // Dialog Data +RD{<~i  
  //{{AFX_DATA(CCaptureDlg) /909ED+)>9  
  enum { IDD = IDD_CAPTURE_DIALOG }; 74%Uojl"  
  CComboBox m_Key; 0 oHnam  
  BOOL m_bControl; @X#e  
  BOOL m_bAlt; OlYCw.Zu  
  BOOL m_bShift; z%L\EP;o}  
  CString m_Path; X!0m,  
  CString m_Number; {hKf 'd9E  
  //}}AFX_DATA 1$ {Cwb/F  
  // ClassWizard generated virtual function overrides .^uYr^( |[  
  //{{AFX_VIRTUAL(CCaptureDlg) xA"7a  
 public: ^g n7DiIPH  
  virtual BOOL PreTranslateMessage(MSG* pMsg); u_ym=N57`  
 protected: eHI7= [h  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Jgf= yri  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); gz"I=9  
  //}}AFX_VIRTUAL JA^Y:@<{/  
  // Implementation 4B@L<Rl{\  
 protected: },tn  
  HICON m_hIcon; C)0JcM  
  // Generated message map functions U~{sJwB  
  //{{AFX_MSG(CCaptureDlg) y Ide]  
  virtual BOOL OnInitDialog(); 7Ust7%  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Q 1e hW  
  afx_msg void OnPaint(); Kj*:G!r0.:  
  afx_msg HCURSOR OnQueryDragIcon(); %%k`+nK~  
  virtual void OnCancel(); k&\ 6SK/  
  afx_msg void OnAbout(); lnRbvulH  
  afx_msg void OnBrowse(); /'>#1J|TlK  
  afx_msg void OnChange(); '~kAsn*/  
 //}}AFX_MSG dK?vg@|'  
 DECLARE_MESSAGE_MAP() iY4FOt7\  
}; NxQ+z^o\  
#endif pL)o@-k#%  
qi-!iT(fe  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file h8tKYm  
#include "stdafx.h" wr;8o*~  
#include "Capture.h" F /% 5 r{  
#include "CaptureDlg.h" twJ)h :!_y  
#include <windowsx.h> !3#*hL1fy  
#pragma comment(lib,"hook.lib") "]D2}E>U;  
#ifdef _DEBUG 6/eh~ME=  
#define new DEBUG_NEW L&SlUXyt.c  
#undef THIS_FILE  -!z,t7!  
static char THIS_FILE[] = __FILE__; :g=z}7!s  
#endif Z3 $3zyi  
#define IDM_SHELL WM_USER+1 - +=+W  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K~Hp%.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @-Js)zcl q  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; <hbxerg  
class CAboutDlg : public CDialog MUU9IMFJ  
{ dzPwlCC%-  
 public: Ok&u4'<  
  CAboutDlg(); w6[uM%fHG  
  // Dialog Data #97w6,P+  
  //{{AFX_DATA(CAboutDlg) f_GqJ7Gk]  
  enum { IDD = IDD_ABOUTBOX }; 6@@J>S>  
  //}}AFX_DATA H{3A6fb<  
  // ClassWizard generated virtual function overrides :If1zB)  
  //{{AFX_VIRTUAL(CAboutDlg)  7ehs+GI  
 protected: @9<MW  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support K\]ey;Bd  
  //}}AFX_VIRTUAL 6?v)Hb}J%d  
  // Implementation hZ@Wl6FG;  
 protected: Fi^Q]9.@{  
  //{{AFX_MSG(CAboutDlg) 3mnq=.<(w  
  //}}AFX_MSG ?1u2P$d  
  DECLARE_MESSAGE_MAP() ]MXeWS(  
}; ^}4=pkJ;s  
bl;C=n  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ngoAFb  
{ e$+?l~  
 //{{AFX_DATA_INIT(CAboutDlg) O0i[GCtP5  
 //}}AFX_DATA_INIT gLef6q{}  
} { f@k2^  
?`%)3gx|  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) jP9)utEm6  
{ *@2?_b}A ^  
 CDialog::DoDataExchange(pDX); I?mU_^no  
 //{{AFX_DATA_MAP(CAboutDlg) v&GBu  
 //}}AFX_DATA_MAP `kd P)lI `  
} 3tlA! e  
."m2/Ks7  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) hw [G  
 //{{AFX_MSG_MAP(CAboutDlg) K2glkGK  
 // No message handlers _pv<_ Sm  
 //}}AFX_MSG_MAP R8 lBh Ls  
END_MESSAGE_MAP() 45;{tS.z,B  
 v NJ!d  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ta-kqt!'  
: CDialog(CCaptureDlg::IDD, pParent) jJF(*D  
{ Qr4c':8  
 //{{AFX_DATA_INIT(CCaptureDlg) ^Fr82rJs  
  m_bControl = FALSE; W=$d|*$  
  m_bAlt = FALSE; tNI~<#+lg  
  m_bShift = FALSE; p Rn vd|  
  m_Path = _T("c:\\"); Jn_;  cN  
  m_Number = _T("0 picture captured."); *hp3w  
  nCount=0; W:^\Oe5&a  
  bRegistered=FALSE; PKhH0O\_U  
  bTray=FALSE; jz_\B(m9%  
 //}}AFX_DATA_INIT mG!Rh  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 $DOBC@xxzT  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); [C]u!\(IF  
} =*aun&  
H"H&uA9"  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 6jiz$x  
{ jMvWS71  
 CDialog::DoDataExchange(pDX); 'W/E*O6BY  
 //{{AFX_DATA_MAP(CCaptureDlg) h<50jnH!  
  DDX_Control(pDX, IDC_KEY, m_Key); A7!=`yA$  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); }l/ !thzC  
  DDX_Check(pDX, IDC_ALT, m_bAlt); h4 s!VK1X  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ZCZYgf@  
  DDX_Text(pDX, IDC_PATH, m_Path); vt" 7[!O  
  DDX_Text(pDX, IDC_NUMBER, m_Number); h9,ui^#d$  
 //}}AFX_DATA_MAP 4A_}:nU  
} %z&=A%'a  
]R8}cbtU  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) '1[}PmhD  
//{{AFX_MSG_MAP(CCaptureDlg) +IiL(\ew  
 ON_WM_SYSCOMMAND() ~7tG%{t%  
 ON_WM_PAINT() u:Q_XXT5  
 ON_WM_QUERYDRAGICON() 7ZbnG@s7  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) > !thxG/_  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) T=|oZ  
 ON_BN_CLICKED(ID_CHANGE, OnChange) rkdwGqG  
//}}AFX_MSG_MAP LO,G2]  
END_MESSAGE_MAP() LB|FVNW/S  
YY (,H!  
BOOL CCaptureDlg::OnInitDialog() h[SuuW  
{ XAV|xlfm  
 CDialog::OnInitDialog(); $:R"IqDG  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); QQ4  &,d  
 ASSERT(IDM_ABOUTBOX < 0xF000); ]e?cKC\"e  
 CMenu* pSysMenu = GetSystemMenu(FALSE); MX-(;H  
 if (pSysMenu != NULL) OQ>r;)/  
 {  opK=Z  
  CString strAboutMenu; Ldnw1xy  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 2-9'zN0u  
  if (!strAboutMenu.IsEmpty()) ]urrAIK  
  { 1'dL8Y  
   pSysMenu->AppendMenu(MF_SEPARATOR); *7'}"@@  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); $\xS~ w  
  } ewYZ} "o  
 } T/#$44ub  
 SetIcon(m_hIcon, TRUE); // Set big icon &y?L^Aq  
 SetIcon(m_hIcon, FALSE); // Set small icon FTx&] QN?  
 m_Key.SetCurSel(0); Y3+GBqP  
 RegisterHotkey(); jFBLElE  
 CMenu* pMenu=GetSystemMenu(FALSE); 'OKDB7Ni  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 5gV%jQgkC  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); S.bB.<  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); /`YHPeXu  
 return TRUE; // return TRUE unless you set the focus to a control #\kYGr-G)  
} %Y"@VcN  
[:geDk9O#'  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Tti]H9g_  
{ N'nI ^=  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ] Ma2*E !p  
 { gw0b>E8gZ&  
  CAboutDlg dlgAbout; w{J0K; L  
  dlgAbout.DoModal(); LEoL6ga  
 } N`7) 88>w  
 else FpjpsD~ Qu  
 { **L. !/  
  CDialog::OnSysCommand(nID, lParam); K~p\B  
 } ENwDW#U9  
} ln#Jb&u  
,}i`1E1=  
void CCaptureDlg::OnPaint() v%(2l|M  
{ `}/&}Sp  
 if (IsIconic()) lLy^@s  
 { P8jXruZr  
  CPaintDC dc(this); // device context for painting \8%64ZL`  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); FI1R7A  
  // Center icon in client rectangle R=jIVw'  
  int cxIcon = GetSystemMetrics(SM_CXICON); eqK6`gHa6  
  int cyIcon = GetSystemMetrics(SM_CYICON); B[:-SWd  
  CRect rect; 9ZjSM,+  
  GetClientRect(&rect); d(RSn|[0  
  int x = (rect.Width() - cxIcon + 1) / 2; u|l]8T9L  
  int y = (rect.Height() - cyIcon + 1) / 2; kYwk'\s  
  // Draw the icon UxZT&x3=)}  
  dc.DrawIcon(x, y, m_hIcon); HE911 lc:  
 } }~Z1C0 t  
 else PaPQ|Pwz  
 { Np>[mNmga  
  CDialog::OnPaint(); RkVU^N"  
 } P+!j[X^  
} $gm`}3C<  
%zx=rn(K  
HCURSOR CCaptureDlg::OnQueryDragIcon() &?\ h[3  
{ LJK<Xen  
 return (HCURSOR) m_hIcon; ngM>Tzirt  
} W)I)QinOH  
&]gw[ `  
void CCaptureDlg::OnCancel() v=15pW  
{ nlaJ  
 if(bTray) {64od0:T  
  DeleteIcon(); /an$4?":~  
  CDialog::OnCancel(); 2 fp\s5%J}  
} WyH2` xxX  
f.ku v"  
void CCaptureDlg::OnAbout() FCv3ZF?K  
{ sr!m   
 CAboutDlg dlg; 2x-67_BHY=  
 dlg.DoModal(); f6x}M9xS%  
} x{IxS?.j+  
(Hqy^EOZ  
void CCaptureDlg::OnBrowse() V3&_ST  
{ _idTsd:\  
 CString str; O-r,&W  
 BROWSEINFO bi; FBpf_=(_1  
 char name[MAX_PATH]; Nq|b$S[4  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); <$)F_R~T3  
 bi.hwndOwner=GetSafeHwnd(); z mvF#o  
 bi.pszDisplayName=name; .Ua|KKK C  
 bi.lpszTitle="Select folder"; xh[De}@  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 5 3=zHYQ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); {e4`D1B  
 if(idl==NULL) :4]^PB@dl  
  return; 8 ;oU{  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); zmk#gk2H  
 str.ReleaseBuffer(); JiL%1y9|  
 m_Path=str; Pl4$`Qw#y  
 if(str.GetAt(str.GetLength()-1)!='\\') OM,-:H,  
  m_Path+="\\"; Id3i qAL  
 UpdateData(FALSE); CO!K[ q#  
} k^-HY[Q9  
}r:H7&|&  
void CCaptureDlg::SaveBmp() EAYx+zI  
{ j #e^PK <  
 CDC dc; I_s4Pf[l  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); .[Ezg(U}ze  
 CBitmap bm; .c~`{j}  
 int Width=GetSystemMetrics(SM_CXSCREEN); Z'EX q.hk  
 int Height=GetSystemMetrics(SM_CYSCREEN); d6ZJh xJ  
 bm.CreateCompatibleBitmap(&dc,Width,Height); _JZS;8WYR  
 CDC tdc; .0^-a=/  
 tdc.CreateCompatibleDC(&dc); 9$F '*{8  
 CBitmap*pOld=tdc.SelectObject(&bm); g7G=ga  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); GmoY~}cg~  
 tdc.SelectObject(pOld); "|&xUWJ!)  
 BITMAP btm; R1Jj 3k  
 bm.GetBitmap(&btm); t>[K:[0U  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ~Ti  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); I9GRSm;0<  
 BITMAPINFOHEADER bih; JR='c)6:  
 bih.biBitCount=btm.bmBitsPixel; yM(zc/?  
 bih.biClrImportant=0; >, 22@4  
 bih.biClrUsed=0; <t[WHDO`  
 bih.biCompression=0; S'"(zc3 =  
 bih.biHeight=btm.bmHeight; __jFSa`at  
 bih.biPlanes=1; L7i^?40  
 bih.biSize=sizeof(BITMAPINFOHEADER); QF 2Eg  
 bih.biSizeImage=size; \Q[u?/TF  
 bih.biWidth=btm.bmWidth; )r _zM~jI  
 bih.biXPelsPerMeter=0; {J-kcD!bz`  
 bih.biYPelsPerMeter=0; }lzUl mRTe  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 6X{RcX]/  
 static int filecount=0; .s7Cr0^k,|  
 CString name; sG{hUsPa  
 name.Format("pict%04d.bmp",filecount++); 0mj^Tms  
 name=m_Path+name; ye Q6\yi  
 BITMAPFILEHEADER bfh; i6F`KF'i&  
 bfh.bfReserved1=bfh.bfReserved2=0; ?rqU&my S  
 bfh.bfType=((WORD)('M'<< 8)|'B'); %G!BbXlz  
 bfh.bfSize=54+size; /lBx}o'  
 bfh.bfOffBits=54; > D:( HWL  
 CFile bf; #SiOx/  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ B=K& +  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); FbRq h|  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER));  ?Y4$  
  bf.WriteHuge(lpData,size); xf/ SUO F  
  bf.Close(); f{=0-%dA  
  nCount++; Z6G>j  
 } nY7 ZK  
 GlobalFreePtr(lpData); !o A,^4(  
 if(nCount==1) 7I>@PV N  
  m_Number.Format("%d picture captured.",nCount); {MK.jw9/  
 else 4f+R}Ee7  
  m_Number.Format("%d pictures captured.",nCount); G?\\k[#,&  
  UpdateData(FALSE); ]AjDe]  
} Ar@" K!TS  
5[\mwUA  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) =1' / ?  
{ C^>txui8  
 if(pMsg -> message == WM_KEYDOWN) f"emH  
 { ~5e)h_y  
  if(pMsg -> wParam == VK_ESCAPE) >q{E9.~b  
   return TRUE; AN ;SRl  
  if(pMsg -> wParam == VK_RETURN)  f,utA3[  
   return TRUE; vMOI&_[\z  
 }  3LKL,z  
 return CDialog::PreTranslateMessage(pMsg); Z["[^=EP  
} JY4sB8  
H4#|f n  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) f>d aK9$(  
{ ]=T`8)_r)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ k.b->U  
  SaveBmp(); + D ,Nd=/  
  return FALSE; Y0`=h"g  
} \%fl`+`  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @SA:64 9  
 CMenu pop; "/v{B?~%!  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); w#EP`aM2$=  
 CMenu*pMenu=pop.GetSubMenu(0); |y+<|fb,a  
 pMenu->SetDefaultItem(ID_EXITICON); 'urn5[i  
 CPoint pt; Jr/|nhGl5  
 GetCursorPos(&pt); CT1)tRN  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); fhCMbq4T  
 if(id==ID_EXITICON) a`XXz  
  DeleteIcon(); 4,D$% .  
 else if(id==ID_EXIT) W10=SM}  
  OnCancel(); 24u;'i-y5  
 return FALSE; ,A`.u\f(:  
} qF9z@a  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); )@"iWQ 3K  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) . e' vc  
 AddIcon(); $ f`\TKlN  
 return res; L8"0o 0-  
} ]F:5-[V#  
~/0 t<^  
void CCaptureDlg::AddIcon() IBYRuaEB  
{ (7 i@ @  
 NOTIFYICONDATA data; ,'~8{,h5  
 data.cbSize=sizeof(NOTIFYICONDATA); }%z {tn  
 CString tip; px!lJtvgo  
 tip.LoadString(IDS_ICONTIP); yHS=8!  
 data.hIcon=GetIcon(0); 8*O]  
 data.hWnd=GetSafeHwnd(); 9H$$Og  
 strcpy(data.szTip,tip); k"-2OT  
 data.uCallbackMessage=IDM_SHELL; YcJZG|[  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; |TCHPKN  
 data.uID=98; 6|q\ M  
 Shell_NotifyIcon(NIM_ADD,&data); Qs24b  
 ShowWindow(SW_HIDE); r q2]u  
 bTray=TRUE; rdK=f<I]  
} }:NE  
.QRa{l_)  
void CCaptureDlg::DeleteIcon() 7s#,.(s  
{  WW5AD$P*  
 NOTIFYICONDATA data; d51.Tbt#%7  
 data.cbSize=sizeof(NOTIFYICONDATA); 6$#p}nE  
 data.hWnd=GetSafeHwnd(); <3aiS?i.h  
 data.uID=98; f=0U&~  
 Shell_NotifyIcon(NIM_DELETE,&data); @f<q&K%FJ  
 ShowWindow(SW_SHOW); <pAN{:  
 SetForegroundWindow(); y7[D9ZvZ  
 ShowWindow(SW_SHOWNORMAL); !/pE6)a  
 bTray=FALSE; t?& a?6:J  
} E3IB> f  
S!*wK-  
void CCaptureDlg::OnChange() -rC_8.u :  
{ KMFvi_8  
 RegisterHotkey(); RzPqtN  
} ";:"p6?  
r`? bYoz  
BOOL CCaptureDlg::RegisterHotkey()  U/v }4b  
{ tbbZGyg5b  
 UpdateData(); v(uYso_  
 UCHAR mask=0; v;=F $3  
 UCHAR key=0; 6y;R1z b  
 if(m_bControl) bUR; d78  
  mask|=4; O3Jp:.ps  
 if(m_bAlt) yXg #<H6V  
  mask|=2; DI/yHs  
 if(m_bShift) 5i 56J1EC  
  mask|=1; CxyL'k  
  key=Key_Table[m_Key.GetCurSel()]; 4~;x(e@S  
 if(bRegistered){ @m*^v\q<u  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); J!l/!Z>!cF  
  bRegistered=FALSE; }= )  
 } <B,z)c  
 cMask=mask; p[kEFE,%  
 cKey=key; nP9zTa  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ,MH9e!  
 return bRegistered; NWK+.{s>m  
} ]xO`c  
+Usy  
  四、小结 |7 .WP;1  
JA .J~3  
  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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