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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: @PL.7FM<v  
  " ""k}M2A  
  一、实现方法 gJ=y7yX  
W1;QPdz:  
  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: Xp67l!{v  
5^5hhm4  
#pragma data_seg("shareddata") \rpXG9  
HHOOK hHook =NULL; //钩子句柄 -){aBMOv3  
UINT nHookCount =0; //挂接的程序数目 J@}PBHK+  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 0 s$;3qE  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 <u_ vL WS  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey TSKT6_IJw  
static int KeyCount =0; d ug^oc1  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 5+DId7d'n  
#pragma data_seg() m7#v2:OD+  
e,K.bgi  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 d1qvS@  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: xY d]|y  
v ^R:XdH  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR {j8M78}3  
cKey,UCHAR cMask) iSP}kM}  
{ le|Rhs%Z%  
 BOOL bAdded=FALSE; goqm6L^Cu  
 for(int index=0;index<MAX_KEY;index++){ H$ZLtPv5  
  if(hCallWnd[index]==0){ 91#rP|88;  
   hCallWnd[index]=hWnd; ;5 p;i 8m  
   HotKey[index]=cKey; dW5@Z-9  
   HotKeyMask[index]=cMask; ,;@v Vm'}  
   bAdded=TRUE; FP<mFqy  
   KeyCount++; ]r\FC\n6e  
   break; :Tcvj5  
  } e>T;'7HSS"  
 } po!bRk[4  
 return bAdded; Zmc"  
} *S<d`mp[  
//删除热键 ZLZh$eZZ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |)65y  
{ *x-@}WY$U  
 BOOL bRemoved=FALSE; /O}lSXo6E  
 for(int index=0;index<MAX_KEY;index++){ : i{tqY%  
  if(hCallWnd[index]==hWnd){ <MyT ;  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ j  Gp&P  
    hCallWnd[index]=NULL; 8n,/hY>w  
    HotKey[index]=0; 5wa'SexqE  
    HotKeyMask[index]=0; LC, 6hpmh  
    bRemoved=TRUE; Bra}HjHO  
    KeyCount--; A2.GNk  
    break; k`((6  
   } {)n@Rq\=v  
  } d:Oo5t)MN  
 } ` 7P%muY.  
 return bRemoved;  X`20=x  
} >{)\GK0i 7  
nX_w F`n"  
8ZF!}kb0F  
  DLL中的钩子函数如下: dczq,evp  
34,'smHi%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) K!,9qH  
{ 6rMXv0)  
 BOOL bProcessed=FALSE; TWM^5 L:U  
 if(HC_ACTION==nCode) W#@6e')d  
 { {.])' ~[U  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 =o:1Rc7J  
   switch(wParam) 9~J#> C0}  
   {  N9#5 P!  
    case VK_MENU: J9/EJ'My  
     MaskBits&=~ALTBIT; Z*+y?5+L"P  
     break; Z<iK(?@O  
    case VK_CONTROL: .L~ NX/V  
     MaskBits&=~CTRLBIT; t"Bp # U1  
     break; `&:>?Y/X2  
    case VK_SHIFT: _fdD4-2U  
     MaskBits&=~SHIFTBIT; 6j Rewj  
     break; q2P_37  
    default: //judge the key and send message 5\Rg%Ezl  
     break; C]Q`!e  
   } t$&'mJ_-w  
   for(int index=0;index<MAX_KEY;index++){ ]$BC f4:  
    if(hCallWnd[index]==NULL) "/y SHB[  
     continue; VHi'~B#'*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *P/DDRq(2  
    { Ss3~X90!*B  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Q?bCQZ{-Lh  
     bProcessed=TRUE; %ol\ sO|  
    } [Z2{S-)UM  
   } Ga_Pt8L6  
  } 8,IQ6Or|-2  
  else if((lParam&0xc000ffff)==1){ //有键按下 ]XASim:A  
   switch(wParam) qe5;Pq !G  
   { _^g4/G#13c  
    case VK_MENU: IF  cre  
     MaskBits|=ALTBIT; ]K'OH&  
     break; 0RjFa;j  
    case VK_CONTROL: o!lKP>  
     MaskBits|=CTRLBIT; r>}z|I'  
     break; 5,pEJ>dDD3  
    case VK_SHIFT: pD!j#suMA  
     MaskBits|=SHIFTBIT; Z*b$&nM  
     break; <G0Ut6J>  
    default: //judge the key and send message Z2 Vri  
     break; <MKX F V  
   } !>N+a3   
   for(int index=0;index<MAX_KEY;index++){ 9^&B.6!6  
    if(hCallWnd[index]==NULL) azzG  
     continue; V|TD+7.`QB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3 Q~0b+k  
    { j/jFS]iC  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); I/%L,XyRI  
     bProcessed=TRUE; 29l bOi  
    } RG=i74a  
   } IR{XL\WF  
  } v cUGBGX_&  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ,rjl|F* T  
   for(int index=0;index<MAX_KEY;index++){ 2*< PmKI  
    if(hCallWnd[index]==NULL) o@hj.)u  
     continue; l<qEX O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) njaKU?6%d2  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *+k yuY J  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 OrF.wcg  
   } jZQ{ XMF  
  } ?,] eN&`  
 } CED[\ n  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 1>/ iYf  
} v$xurj:v#i  
=4sx(<  
  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: /x)i}M)  
YhzDw8f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); iUFG!,+d  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); d+vAm3.Dg  
xSm~V3b c  
  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: &JYkh >  
/6F\]JwU  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7[mP@ {  
{ V(XZ7<& {  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ^G 'n z  
 { ]0O3kiVQ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Q{5.;{/eC  
  SaveBmp(); ~Q#! oh'i  
  return FALSE; H )>3c1  
 } #?`S+YN!q)  
 …… //其它处理及默认处理 _#Lq~02 %  
} Q3Z?Z;2aR  
N ]14~r=  
,c0t#KgQ.  
  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。 ZNl1e'  
Vc6 >i|"-O  
  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。 .'.bokl/  
?p/}eRgi  
  二、编程步骤 EM@EB< pRX  
:0ltq><?  
  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"; ll[&O4.F  
^(Z%,j3O  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 9KB}?~Nx4  
M]M>z>1*v  
  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; y\4/M6  
7SN61)[m  
  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; W9oWj7&h  
Sb?Ua*(L:  
  5、 添加代码,编译运行程序。 \3] O?'  
$BT[fJ'k  
三、程序代码 ?`xm_udc  
zk!7TUZ">w  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL EiaP1o  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) i`Qa7  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 9 ~$E+ m(  
#if _MSC_VER > 1000 <o[3*59  
#pragma once W'=}2Y$]u  
#endif // _MSC_VER > 1000 jt(GXgm  
#ifndef __AFXWIN_H__ >y,. `ECn  
#error include 'stdafx.h' before including this file for PCH WgG$ r  
#endif )#1!%aQ  
#include "resource.h" // main symbols I;1)a4Xc4R  
class CHookApp : public CWinApp 2ga8 G4dU  
{ SkC.A ?  
 public: ~{);Ab.9+  
  CHookApp(); -E3cS  
  // Overrides lWd@  
  // ClassWizard generated virtual function overrides ,jtaTG.>  
  //{{AFX_VIRTUAL(CHookApp) T@`Al('  
 public: >)u{%@Rcy{  
  virtual BOOL InitInstance(); c10$5V&@  
  virtual int ExitInstance(); 717G CL@  
  //}}AFX_VIRTUAL _yX.Apv]  
  //{{AFX_MSG(CHookApp) Jh<s '&FR  
  // NOTE - the ClassWizard will add and remove member functions here. OSLZ7B^  
  // DO NOT EDIT what you see in these blocks of generated code ! ^fyue~9u  
  //}}AFX_MSG s&'FaqE  
  DECLARE_MESSAGE_MAP() | lZJt  
}; Ycx}FYTY  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); A|]#b?-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'x<oILOG  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); eMdf [eS  
BOOL InitHotkey(); hSXJDT2  
BOOL UnInit(); K3UN#G)U  
#endif |:Maa6(W  
0*9xau{(  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. s[dIWYs#  
#include "stdafx.h" &r*F+gL  
#include "hook.h" G<$8g-O;D  
#include <windowsx.h> D%LYQ  
#ifdef _DEBUG Sv0?_3C  
#define new DEBUG_NEW Mu-kvgO`L  
#undef THIS_FILE Owgy<@C  
static char THIS_FILE[] = __FILE__; 4eG\>#5  
#endif LXsZk|IhM  
#define MAX_KEY 100 AaoS & q  
#define CTRLBIT 0x04 n)Cr<^j  
#define ALTBIT 0x02 7-Oa34ba+  
#define SHIFTBIT 0x01 ^ERdf2  
#pragma data_seg("shareddata") }%jpqip  
HHOOK hHook =NULL; 1X`,7B@pz  
UINT nHookCount =0; bq8Wvlv04  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey >M!LC  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Jw&Fox7p  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey lhnGk'@d  
static int KeyCount =0; bBXLW}W  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift `W" ;4A  
#pragma data_seg() O9o]4;  
HINSTANCE hins; S0gxVd(  
void VerifyWindow(); h^qZi@L  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) %W2U$I5  
//{{AFX_MSG_MAP(CHookApp) f [.'V1  
// NOTE - the ClassWizard will add and remove mapping macros here. rlawH}1b  
// DO NOT EDIT what you see in these blocks of generated code! A%7f;&x!  
//}}AFX_MSG_MAP hW/Ve'x[  
END_MESSAGE_MAP() diVg|Z3T  
H?a $o(  
CHookApp::CHookApp() "frioi`a2  
{ ,!GoFu  
 // TODO: add construction code here, 2K o]Q_,~  
 // Place all significant initialization in InitInstance r>i95u82'  
} 4zt:3bW U  
9Li&0E  
CHookApp theApp; 12hD*,A5j  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) XGbpH<  
{ 4\p%|G^hU  
 BOOL bProcessed=FALSE; mk^, {D  
 if(HC_ACTION==nCode) 8O(L;&h  
 { tLN^k;w  
  if((lParam&0xc0000000)==0xc0000000){// Key up 3 =c#LUA`  
   switch(wParam) z$}9f*W}B  
   { zK1]o-wSAT  
    case VK_MENU: YTmHht{j#  
     MaskBits&=~ALTBIT; \%bJXTK&W  
     break; (=fLWK{8  
    case VK_CONTROL: Lj#xZ!mQS  
     MaskBits&=~CTRLBIT; qO8:|q1%;\  
     break; r}^1dO  
    case VK_SHIFT: afna7TlS  
     MaskBits&=~SHIFTBIT; N{&Lo}6F  
     break; x4g/ok  
    default: //judge the key and send message 9wGsHf8]  
     break; X%&7-PO  
   } /DyeMCY-  
   for(int index=0;index<MAX_KEY;index++){ V=th-o3[  
    if(hCallWnd[index]==NULL) FE^/us7r  
     continue; Oq,@{V@)9k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >;Vfs{Z(q  
    { &7>]# *  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .taP2^2Z  
     bProcessed=TRUE; G!=(^G@J;  
    }  :TR:tf  
   }  qsXkm4  
  } 'W4v>0   
  else if((lParam&0xc000ffff)==1){ //Key down }YBuS3{  
   switch(wParam) -sZ'<(3  
   { x3#:C=  
    case VK_MENU: p~=z)7% e'  
     MaskBits|=ALTBIT; >3B {sn}  
     break; 7CSz  
    case VK_CONTROL: izGU&VeB  
     MaskBits|=CTRLBIT; }$L1A   
     break; Q _!tn*  
    case VK_SHIFT: Y<(7u`F  
     MaskBits|=SHIFTBIT; }7b{ZbDI  
     break; C4`&_yoP4-  
    default: //judge the key and send message IDD`N{EA  
     break; TQNdBq5I6  
   } m ie~. "  
   for(int index=0;index<MAX_KEY;index++) XTk :lzFH  
   { |2n*Ds'  
    if(hCallWnd[index]==NULL) (Fuu V{x|  
     continue; pU<J?cU8N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lo'#dpt<  
    { DNqV]N_W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Q&w_kz.  
     bProcessed=TRUE; GD d'{qE6  
    } XOQ0(e6  
   } ?wv3HN  
  } m9MY d  
  if(!bProcessed){ +;,J0,Yn  
   for(int index=0;index<MAX_KEY;index++){ T,uF^%$@AQ  
    if(hCallWnd[index]==NULL) bma.RCyY<  
     continue; +v5f-CBu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) skan1wQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); RMpiwO^  
   } {jQLr7'  
  } WN%,   
 } 5lP8#O?=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); N~IAm:G}[  
} 9+@z:j  
((#BU=0iK  
BOOL InitHotkey() D_$N2>I-  
{ DbB<8$  
 if(hHook!=NULL){ nvLdgu4P>  
  nHookCount++; <pa-C2Ky  
  return TRUE; d}Guj/cx,  
 } N%Y!{k5T7  
 else ohyq/u+y~A  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); QGV#AID3XW  
  if(hHook!=NULL) bV2a2#kj  
   nHookCount++; Rr CG(Bh  
  return (hHook!=NULL); 7t#Q8u?  
} V#.pi zb  
BOOL UnInit() MZf?48"f  
{ 4gev^/^^  
 if(nHookCount>1){ &=M4Z/Ao  
  nHookCount--; .o]I^3tf c  
  return TRUE; }a, ycFt  
 } cC/32SmY4  
 BOOL unhooked = UnhookWindowsHookEx(hHook); \),f?f-m  
 if(unhooked==TRUE){ u$zRm(!RB  
  nHookCount=0; tN4&#YK<  
  hHook=NULL; a3w6&e`  
 } K;rgLj0m  
 return unhooked; yS4VgP'W  
} qrj f  
e1JH N  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }Rh%bf7,  
{ 'U ZzH$h  
 BOOL bAdded=FALSE; "s]  
 for(int index=0;index<MAX_KEY;index++){ XRQ1Uh6  
  if(hCallWnd[index]==0){ [_3&  
   hCallWnd[index]=hWnd; i%<NKE;v7m  
   HotKey[index]=cKey; 0QPY+6  
   HotKeyMask[index]=cMask; `+vQ5l$;L  
   bAdded=TRUE; DCLu^:|C"  
   KeyCount++; 2vG X\W% 3  
   break; fibudkg'>  
  } b&4JHyleF  
 } OvwoU=u  
 return bAdded; )CE]s)6+2  
}  !O`j  
8mRZ(B>% X  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) oH v.EO  
{ :eD-'#@$u  
 BOOL bRemoved=FALSE;  q"T?  
 for(int index=0;index<MAX_KEY;index++){ )F&.0 '  
  if(hCallWnd[index]==hWnd){ |@1(^GX  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0g=vMLi  
    hCallWnd[index]=NULL; 2_3os P\Z  
    HotKey[index]=0; v5pkP  
    HotKeyMask[index]=0; c /^:vTF  
    bRemoved=TRUE; F;_o `h  
    KeyCount--; |Rx+2`6Dp  
    break; g{sp<w0  
   } 4Hb"yp$  
  } {` bX*]  
 } >7cj. %  
 return bRemoved; `W_&^>yl  
} 9ei'oZ  
!ii( 2U  
void VerifyWindow() \}kR'l  
{ gpzFY"MS=  
 for(int i=0;i<MAX_KEY;i++){ .mqMzV  
  if(hCallWnd!=NULL){ j r .{M  
   if(!IsWindow(hCallWnd)){ d_&pxy? >  
    hCallWnd=NULL; o+ {i26%  
    HotKey=0; '~f*O0_  
    HotKeyMask=0; Ei+lVLoC  
    KeyCount--; qB K68B)  
   } 2G5|J{4w  
  } =N\$$3m?  
 } KVEc:<|x  
} _99 +Vjy  
h:C:opa-=  
BOOL CHookApp::InitInstance() |x&4vHXR0  
{ MNTVG&h  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); _7;G$\^&.  
 hins=AfxGetInstanceHandle(); LX&O"YY  
 InitHotkey(); L7GNcV]c  
 return CWinApp::InitInstance(); 0LzS #J+  
} lFIaC}  
=HIKn6C<  
int CHookApp::ExitInstance() K%/\XnCY  
{ gN(kRhp  
 VerifyWindow(); G)b:UJa"  
 UnInit(); +8 \?7,FY  
 return CWinApp::ExitInstance(); EW4a@  
} IUh9skW5  
^2%)Nq;O  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 9{S$%D  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) }uaFmXy3  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ e?07o!7[;  
#if _MSC_VER > 1000 .`J*l=u$  
#pragma once %G6x\[,  
#endif // _MSC_VER > 1000 l& sEdEA  
%z[=T@  
class CCaptureDlg : public CDialog 1B&XM^>/  
{ sRcS-Yw[S  
 // Construction Mg8ciV}\xY  
 public: ~p{YuW[e  
  BOOL bTray; ]{{%d4  
  BOOL bRegistered; .}+3A~  
  BOOL RegisterHotkey(); MZA%ET,l,<  
  UCHAR cKey; BonjK#  
  UCHAR cMask; =F/R*5:T  
  void DeleteIcon(); H>]*<2(=-  
  void AddIcon(); x N>\t& c  
  UINT nCount; n4XkhY|  
  void SaveBmp(); Nknd8>Hy+  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Kc1w[EQ  
  // Dialog Data fo/sA9  
  //{{AFX_DATA(CCaptureDlg) 67}8EV!/k  
  enum { IDD = IDD_CAPTURE_DIALOG }; + >:}   
  CComboBox m_Key; (=gqqOOl~  
  BOOL m_bControl; Pjvb}q=  
  BOOL m_bAlt; eL)m(  
  BOOL m_bShift; iny/K/5bf  
  CString m_Path; 'aD"v>  
  CString m_Number; <j#IR  
  //}}AFX_DATA CV{ZoY  
  // ClassWizard generated virtual function overrides :U'n0\  
  //{{AFX_VIRTUAL(CCaptureDlg) gwg~4:W  
 public: j1K~zG  
  virtual BOOL PreTranslateMessage(MSG* pMsg); GuL0:,  
 protected: QL2 LIs  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support F`,bFQ  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); e,#5I(E  
  //}}AFX_VIRTUAL H D$`ZV  
  // Implementation A93(} V7I  
 protected: 6wq%4RI0  
  HICON m_hIcon; p`U#  
  // Generated message map functions ~fcC+"7q/  
  //{{AFX_MSG(CCaptureDlg) lY,9bSF$  
  virtual BOOL OnInitDialog(); Vz!{nL0Q(  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); " ~6&rt  
  afx_msg void OnPaint(); gr.G']9lNq  
  afx_msg HCURSOR OnQueryDragIcon(); sMJa4P>O@  
  virtual void OnCancel(); #%OS=.V  
  afx_msg void OnAbout(); UN;U+5,t  
  afx_msg void OnBrowse(); TOSk+2P  
  afx_msg void OnChange(); o2]Np~`g,  
 //}}AFX_MSG 94*MRn1E  
 DECLARE_MESSAGE_MAP() ) 54cG  
}; _x!/40^G  
#endif }I`o%GL  
*(/b{!~  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 4{6,Sx  
#include "stdafx.h" YLSDJ$K6  
#include "Capture.h" /9P7;1?  
#include "CaptureDlg.h" _wW"Tn]  
#include <windowsx.h> $mf6!p4  
#pragma comment(lib,"hook.lib") ci 22fw0  
#ifdef _DEBUG m<cv3dbZo  
#define new DEBUG_NEW Xfg?\j/  
#undef THIS_FILE O0pXHXSAL  
static char THIS_FILE[] = __FILE__; *8%uXkMm  
#endif iQCs 8hIR  
#define IDM_SHELL WM_USER+1  _qt  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s6 K~I  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v Oo^H  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; P$clSJW  
class CAboutDlg : public CDialog ?&U~X)Q  
{ @fVz *  
 public: K3rsew n  
  CAboutDlg(); dOg c%(kz  
  // Dialog Data mwz!7Q   
  //{{AFX_DATA(CAboutDlg) H6 $pA^  
  enum { IDD = IDD_ABOUTBOX }; yB;K|MXy?  
  //}}AFX_DATA ^fS_h `B  
  // ClassWizard generated virtual function overrides = P$7 "  
  //{{AFX_VIRTUAL(CAboutDlg) i5*/ZA_  
 protected: !g~u'r'1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #Wv8+&n  
  //}}AFX_VIRTUAL uBM%E OE  
  // Implementation [Mv'*.7  
 protected: j zZEP4  
  //{{AFX_MSG(CAboutDlg) >DzW  OB  
  //}}AFX_MSG '^2bC  
  DECLARE_MESSAGE_MAP() $V_w4!:Q  
}; $B%3#-  
AX )dZdd  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) BBl9<ne$  
{ Fj <a;oV  
 //{{AFX_DATA_INIT(CAboutDlg) 9Z3Y,`R,  
 //}}AFX_DATA_INIT =}SC .E\  
} H3ob 8+J  
j(_6.zf  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 8}Maj  
{ np7!y U  
 CDialog::DoDataExchange(pDX); OF! n}.O(  
 //{{AFX_DATA_MAP(CAboutDlg) :%zAX  
 //}}AFX_DATA_MAP kH62#[J)yM  
} 2>Kn'p  
q\fai^_  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) #CB`7 }jq  
 //{{AFX_MSG_MAP(CAboutDlg) ?V)M!  
 // No message handlers dda*gq/p  
 //}}AFX_MSG_MAP yfA h=  
END_MESSAGE_MAP() h61BIc@>  
!T]bz+  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~llw_ w  
: CDialog(CCaptureDlg::IDD, pParent) eI5W; Q4  
{ )OQih+#?W  
 //{{AFX_DATA_INIT(CCaptureDlg) $*+UX   
  m_bControl = FALSE; 6bbzgULl  
  m_bAlt = FALSE; If@%^'^ON=  
  m_bShift = FALSE; >>h0(G|  
  m_Path = _T("c:\\"); XO/JnJ^B  
  m_Number = _T("0 picture captured."); gvxOo#8]  
  nCount=0; S%Z2J)H"  
  bRegistered=FALSE; z }P1+Pm  
  bTray=FALSE; `u;4Z2Lr0  
 //}}AFX_DATA_INIT  }_?FmuU  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 gBXbB9  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Gii1|pLZ1  
} {'f=*vMI  
MrS~u  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) l;;"v) C8  
{ { %af  
 CDialog::DoDataExchange(pDX); ;J?zD9  
 //{{AFX_DATA_MAP(CCaptureDlg) .+`Z:{:BC&  
  DDX_Control(pDX, IDC_KEY, m_Key); >=L<3W1  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); a0B,[i  
  DDX_Check(pDX, IDC_ALT, m_bAlt); gG,gL 9o  
  DDX_Check(pDX, IDC_SHIFT, m_bShift);  'v&f  
  DDX_Text(pDX, IDC_PATH, m_Path); 7{u1ynt   
  DDX_Text(pDX, IDC_NUMBER, m_Number); xJE26i  
 //}}AFX_DATA_MAP ~5_>$7L>  
} }& e#b]&:*  
Sh o] ~)XX  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) t1]sv VX,w  
//{{AFX_MSG_MAP(CCaptureDlg) ?Ns aZ  
 ON_WM_SYSCOMMAND() uhr&P4EW  
 ON_WM_PAINT() T_4y;mf!@O  
 ON_WM_QUERYDRAGICON() rqi|8gKY  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 9$N~OZ;-*x  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ?_G?SQ  
 ON_BN_CLICKED(ID_CHANGE, OnChange) qMmhmH)Gp  
//}}AFX_MSG_MAP zVtNT@1K>u  
END_MESSAGE_MAP() tc)4$"9)  
VrZ6m  
BOOL CCaptureDlg::OnInitDialog() ?C|b>wM/  
{ )Hlc\Mgy  
 CDialog::OnInitDialog(); X&bnyo P  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); N51RBA  
 ASSERT(IDM_ABOUTBOX < 0xF000); 3 *[YM7y  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 7D)i]68E  
 if (pSysMenu != NULL) mMtX:  
 { Bez 7  
  CString strAboutMenu; G\o *j |  
  strAboutMenu.LoadString(IDS_ABOUTBOX); eTY" "EWU  
  if (!strAboutMenu.IsEmpty()) 2z=aP!9]  
  { 0HS"Oxx'  
   pSysMenu->AppendMenu(MF_SEPARATOR); >=3ay^(Y2D  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ^/v!hq_#%&  
  } ;,jms~ik  
 } 3h>5 6{P  
 SetIcon(m_hIcon, TRUE); // Set big icon :~dI2e\:  
 SetIcon(m_hIcon, FALSE); // Set small icon W{*w<a_ `  
 m_Key.SetCurSel(0); $_&gT.>  
 RegisterHotkey(); [n9X5qG~  
 CMenu* pMenu=GetSystemMenu(FALSE); Q.])En >i  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ~;B@ {kFY)  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); '/H+  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); b:>t1S Ul  
 return TRUE; // return TRUE unless you set the focus to a control FaE,rzn)iD  
} LuUfdzH  
KZt4 dr  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) }6^d/nE*T  
{ Oxhc!9F  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) dQH9NsV7g  
 { P[bj {lo  
  CAboutDlg dlgAbout; XCU>b[Cj,  
  dlgAbout.DoModal(); (cEjC`]  
 } QGQ}I  
 else uf&Ke k,  
 { K trR+ :  
  CDialog::OnSysCommand(nID, lParam); 0 P-eC|0  
 }  C%\.  
} 0!!z'm3  
v d}Y$X  
void CCaptureDlg::OnPaint() I~P]_D mM  
{ BjyGk+A   
 if (IsIconic()) 1me16 5y<B  
 { )]a{cczL"  
  CPaintDC dc(this); // device context for painting sT|FgB  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); #99fFs`w  
  // Center icon in client rectangle d%='W|i\p&  
  int cxIcon = GetSystemMetrics(SM_CXICON); NT<> LWo  
  int cyIcon = GetSystemMetrics(SM_CYICON); is [p7-  
  CRect rect; A5LTgGzaW  
  GetClientRect(&rect); %I6c}*W  
  int x = (rect.Width() - cxIcon + 1) / 2; jV!9IK;HA.  
  int y = (rect.Height() - cyIcon + 1) / 2; %nkP?gn"a  
  // Draw the icon h TY7`m">  
  dc.DrawIcon(x, y, m_hIcon); aR}L- -m  
 } A ^wIsAxT  
 else  b"C1  
 { ?#rejA:  
  CDialog::OnPaint(); mU3 @|a/@0  
 } ,8MUTXd@ V  
} c O[Hr  
.gK>O2hI  
HCURSOR CCaptureDlg::OnQueryDragIcon() 1'{A,!  
{ BVk&TGa;[$  
 return (HCURSOR) m_hIcon; yG<`7v  
} n_X)6 s  
?$&iVN^UA  
void CCaptureDlg::OnCancel() U4hFPK<  
{ %Vp'^,&S  
 if(bTray) |Q)c{9sD  
  DeleteIcon(); l;C00ZBOc  
  CDialog::OnCancel(); &6mXsx$  
} 5bKm)|4z6  
J$X{4  
void CCaptureDlg::OnAbout() {"x8 q  
{ K~B@8az  
 CAboutDlg dlg; I"<ACM  
 dlg.DoModal(); D[ -Gzqh  
} p Y[dJxB  
c8cPGm#i  
void CCaptureDlg::OnBrowse() xJ18M@" j  
{ i{ " g 7  
 CString str; :n} NQzs  
 BROWSEINFO bi; 2!+saf^-,  
 char name[MAX_PATH]; m$X0O_*A  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); qz .{[ l  
 bi.hwndOwner=GetSafeHwnd(); +7]]=e<[E  
 bi.pszDisplayName=name; g~i%*u,Y<  
 bi.lpszTitle="Select folder"; +jPs0?}s  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Z*Fxr;)d  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); zJ2dPp~u  
 if(idl==NULL)  aX'R&R  
  return; w`")^KXi  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 4.}{B_)LK  
 str.ReleaseBuffer(); @d]a#ypU  
 m_Path=str; >w~Hq9  
 if(str.GetAt(str.GetLength()-1)!='\\') nA#FGfZ{Ge  
  m_Path+="\\"; *$eMM*4  
 UpdateData(FALSE); sD[G?X  
} Fuuy_+p@G  
Ur/+nL{  
void CCaptureDlg::SaveBmp()  @{|vW  
{ lSu\VCG  
 CDC dc; B]o5 HA<k  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 2# y!(D8  
 CBitmap bm; V"T48~Ue  
 int Width=GetSystemMetrics(SM_CXSCREEN); 6pHn%yE*  
 int Height=GetSystemMetrics(SM_CYSCREEN); ?'dsiA[  
 bm.CreateCompatibleBitmap(&dc,Width,Height); im6Rx=}E{  
 CDC tdc; @FBlF$vG  
 tdc.CreateCompatibleDC(&dc); cy6lsJ"?  
 CBitmap*pOld=tdc.SelectObject(&bm); 5A~lu4-q  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); HoIK^t~VT#  
 tdc.SelectObject(pOld); TC%ENxDR  
 BITMAP btm; %xq/eC7  
 bm.GetBitmap(&btm); ;MH<T6b  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 6/Pw'4H9$  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); hrRkam !y  
 BITMAPINFOHEADER bih; Ob"48{w$  
 bih.biBitCount=btm.bmBitsPixel; l*`2 EJ  
 bih.biClrImportant=0; MY[QYBkn}  
 bih.biClrUsed=0; ,'E+f%  
 bih.biCompression=0; #H;yXsR `  
 bih.biHeight=btm.bmHeight; y]5c!N %8  
 bih.biPlanes=1; j6NK 7Li  
 bih.biSize=sizeof(BITMAPINFOHEADER); 2Bf]#l{z  
 bih.biSizeImage=size; GjmPpKIu\  
 bih.biWidth=btm.bmWidth; $T)EJe  
 bih.biXPelsPerMeter=0; rk$$gXg9/  
 bih.biYPelsPerMeter=0; z ]@ Q  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 2th>+M~A  
 static int filecount=0; M :4N'#`  
 CString name; dZ1/w0<M2  
 name.Format("pict%04d.bmp",filecount++); rX-V0  
 name=m_Path+name; 0pYCh$TL1  
 BITMAPFILEHEADER bfh; 7NY9UQ  
 bfh.bfReserved1=bfh.bfReserved2=0; _|!FhZ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); jgfl|;I?pg  
 bfh.bfSize=54+size; S8 {Sb>  
 bfh.bfOffBits=54; Aw38T w  
 CFile bf; nsRZy0@$t  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ws tH&^  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); VhWF(*  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); `H:5D5]  
  bf.WriteHuge(lpData,size); Z uh!{_x;  
  bf.Close(); 0gs0[@  
  nCount++; Q/y^ff]=  
 } v7i5R !  
 GlobalFreePtr(lpData); B-@ ]+W  
 if(nCount==1) &K1\"  
  m_Number.Format("%d picture captured.",nCount); o:E_k#Fi  
 else k|Hxd^^I  
  m_Number.Format("%d pictures captured.",nCount); w _*|u  
  UpdateData(FALSE); -t<8)9q(  
} O[tOpf@s.  
]Tb ?k+a  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Vh.9/$xQ  
{ JwkMRO  
 if(pMsg -> message == WM_KEYDOWN) 7(q EHZEr  
 { WxN@&g(  
  if(pMsg -> wParam == VK_ESCAPE) rW~hFSrV[o  
   return TRUE; zSpL^:~  
  if(pMsg -> wParam == VK_RETURN) Jj~c&LxrO  
   return TRUE; yK$.wd 2,  
 } M7\; Y  
 return CDialog::PreTranslateMessage(pMsg); 1nt VM+  
} cVg!"  
`eF&|3!IYQ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4z_>CiA  
{ "I)*W8wTn  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ dKOW5\H'  
  SaveBmp(); [ _jd  
  return FALSE; 8f^QO:  
} (d L;A0L  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 63J_u-o  
 CMenu pop; XzX-Q'i=n0  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); O[N}@%HMW  
 CMenu*pMenu=pop.GetSubMenu(0); *bl*R';  
 pMenu->SetDefaultItem(ID_EXITICON); $*%ipD}f  
 CPoint pt; @Gh?|d7bD  
 GetCursorPos(&pt); "|2|Vju%  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); f`8]4ms"  
 if(id==ID_EXITICON) R::0.*FF  
  DeleteIcon(); j2U iZLuV  
 else if(id==ID_EXIT) ^x! N]  
  OnCancel(); jkPye{j  
 return FALSE; muAI$IRR   
} 'w'P rM,:  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); AI$r^t1  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ]6`]+&  
 AddIcon(); Hcp)Q76X  
 return res; F~NmLm  
} A,tmy',d"  
x >u \  
void CCaptureDlg::AddIcon() h83;}>  
{ 'u \my  
 NOTIFYICONDATA data; &0E>&1`7  
 data.cbSize=sizeof(NOTIFYICONDATA); *u2pk>y)  
 CString tip; v4?qI >/  
 tip.LoadString(IDS_ICONTIP); "kLu]M<  
 data.hIcon=GetIcon(0); <Ae1YHUY  
 data.hWnd=GetSafeHwnd(); :'L^zGf  
 strcpy(data.szTip,tip); MH"{N "|  
 data.uCallbackMessage=IDM_SHELL; Mw0Kg9M  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; z,6X{=  
 data.uID=98; 8{m5P8w'  
 Shell_NotifyIcon(NIM_ADD,&data); ICJp-  
 ShowWindow(SW_HIDE); Ez3>}E,  
 bTray=TRUE; L(p{>Ykcc  
} hdi/k!9[\  
 d"E@e21  
void CCaptureDlg::DeleteIcon() 6;LM1 _  
{ l3d^V&Sk  
 NOTIFYICONDATA data; e?Pzhh a  
 data.cbSize=sizeof(NOTIFYICONDATA); 5 A/[x $q  
 data.hWnd=GetSafeHwnd(); ,rvw E  
 data.uID=98; S%h[e[[fST  
 Shell_NotifyIcon(NIM_DELETE,&data); >)/,5VSE  
 ShowWindow(SW_SHOW); Orb('Z,-3  
 SetForegroundWindow(); 2D5S%27,  
 ShowWindow(SW_SHOWNORMAL); 9WXJz;  
 bTray=FALSE; C q/936`O  
} Q7 dXTS4H  
Im NTk  
void CCaptureDlg::OnChange() -~nU&$ccL  
{ Hs%;uyI@$  
 RegisterHotkey(); ])d_B\)Kck  
} j%2l%Mx(  
px@:t}  
BOOL CCaptureDlg::RegisterHotkey() q,#j *  
{ [D]9M"L,vQ  
 UpdateData(); HFJna2B`  
 UCHAR mask=0; ^)r^k8y'  
 UCHAR key=0; On[:]#  
 if(m_bControl) ~Rs_ep'+Q2  
  mask|=4; rf2+~B{$,  
 if(m_bAlt) YbMeSU/sX  
  mask|=2;  _\H MF  
 if(m_bShift) 8\z5*IPGs  
  mask|=1; $=7'Cm ?  
  key=Key_Table[m_Key.GetCurSel()]; 4LO U[D  
 if(bRegistered){ 5t` :=@u  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Pj4WWKX  
  bRegistered=FALSE; -&PiD  
 } ;#3l&HRKH1  
 cMask=mask; h0YIPB  
 cKey=key; o"O=Epg  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); bITc9Hqc  
 return bRegistered; N5 BC<pu  
} K~j&Q{yws@  
ZRDY `eK  
  四、小结 0KW@j>=jK  
zJp}JO  
  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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