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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: M13HD/~O  
  3kn-tM  
  一、实现方法 G4)~p!TSQ  
;g|Vt}a&4  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: <Y]LY_(  
tk"+ u_uw  
#pragma data_seg("shareddata") nuce(R  
HHOOK hHook =NULL; //钩子句柄 Fv$tl)p*  
UINT nHookCount =0; //挂接的程序数目 gQn%RPMh  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 N''QQBUD  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 yKc-:IBb{u  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey w' 7sh5  
static int KeyCount =0; c7e,lgG-  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 @Vm*b@  
#pragma data_seg() AFrJzh:V[  
9bM\ (s/  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 <Riz!(G  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: K zWo}tT  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR U2 *ORd  
cKey,UCHAR cMask) ~aob@(  
{ :"%/u9<A  
 BOOL bAdded=FALSE; c[h~=0UtJ  
 for(int index=0;index<MAX_KEY;index++){ 6mM9p)"$  
  if(hCallWnd[index]==0){ * ,hhX psa  
   hCallWnd[index]=hWnd; cLtVj2Wb  
   HotKey[index]=cKey; /LD3Bb)O  
   HotKeyMask[index]=cMask; t3;Zx+Br  
   bAdded=TRUE; R;< q<i_l  
   KeyCount++; 2Rk}ovtD[  
   break; s2<!Zb4  
  } KdVKvs[  
 } l=~!'1@L}  
 return bAdded; 02-ql F@i  
} MEDh  
//删除热键 / F0q8j0  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) PYkhY;*  
{ M+/G>U  
 BOOL bRemoved=FALSE; bZnOX*y]  
 for(int index=0;index<MAX_KEY;index++){ 5hrI#fpOR  
  if(hCallWnd[index]==hWnd){ SVCh!/qe\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ MGg(d  
    hCallWnd[index]=NULL; }3(!kW  
    HotKey[index]=0; )Qbd/zd\U  
    HotKeyMask[index]=0; owAO&"C  
    bRemoved=TRUE; @62T:Vl  
    KeyCount--; z(|^fi(  
    break; 5ya9VZ5#  
   } IG^@VQ%  
  } {9x_E {  
 } }9fa]D-a?  
 return bRemoved; /_C2O"h  
} =nEP:7~{  
&\h7E   
98[uRywI  
  DLL中的钩子函数如下: Ew8@{X y  
.~]|gg~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) y'R}  
{ fUT[tkb/!  
 BOOL bProcessed=FALSE; CFtQPTw  
 if(HC_ACTION==nCode) $RD~,<oEm  
 { 3lP;=* m.  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 zm_8a!.  
   switch(wParam) feej'l }F  
   {  R<|\Z@z  
    case VK_MENU: ].d2CJ'  
     MaskBits&=~ALTBIT; @^,q/%;  
     break; vm [lMx  
    case VK_CONTROL: `^M]|7  
     MaskBits&=~CTRLBIT; 8U{D)KgS  
     break; 5zl+M`  
    case VK_SHIFT: q W(@p`  
     MaskBits&=~SHIFTBIT; 1Bh"'9-!JT  
     break; HbTVuf o  
    default: //judge the key and send message fM= o?w6v  
     break; M xE]EJZ  
   } D!j/a!MaKk  
   for(int index=0;index<MAX_KEY;index++){ xl}rdnf}  
    if(hCallWnd[index]==NULL) S=@+qcI  
     continue; w~3X m{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h@,ja  
    { sy&[Q{,4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =KE7NXu]-  
     bProcessed=TRUE; SuE~Wb 5&  
    } 3[m~-8  
   } Xoj"rR9|  
  } !>`Q]M`  
  else if((lParam&0xc000ffff)==1){ //有键按下 X~{6$J|]#i  
   switch(wParam) ",#.?vT`  
   { sx,$W3zI'G  
    case VK_MENU: "HOZ2_(o  
     MaskBits|=ALTBIT; Sn=6[RQ>P  
     break; 3smkY  
    case VK_CONTROL: \:vF FK4a  
     MaskBits|=CTRLBIT; WogUILB  
     break; c{q+h V=  
    case VK_SHIFT: .3 EZk86  
     MaskBits|=SHIFTBIT; ;n&95t1$  
     break; vq$6e*A  
    default: //judge the key and send message `PWKA;W$0  
     break; yV^Yp=f_  
   } 4]d^L>  
   for(int index=0;index<MAX_KEY;index++){ IwyA4Ak Ru  
    if(hCallWnd[index]==NULL) b?~p/[  
     continue; rj4@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )_#V>cvNG  
    { 4_#$k{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4I4m4^  
     bProcessed=TRUE; 6N/(cUXJ  
    } =G-OIu+H!U  
   } sW>%mnx  
  } fc#9e9R  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 {lI}a8DP  
   for(int index=0;index<MAX_KEY;index++){ U:7h>Z0W  
    if(hCallWnd[index]==NULL) +){^HC\7h  
     continue; zJDHDr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -E-#@s  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4n,&,R r#  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 K?.~}82c  
   } V)$!WPL@  
  } C5~#lNC  
 } t{k:H4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !I7$e&Uz@  
} j\}.GM'8  
Y\ [|k-6  
  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: Wt.DL mO  
$|$@?H>K  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); J8'"vc}=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); z "@^'{.l  
4.9qB  
  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: d4y#n=HnnV  
Mh%{cLM  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) mWviWHK  
{ *i"9D:  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) xm m,- u  
 { TmgC {_  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 r)<A YX]J  
  SaveBmp(); ,np=m17  
  return FALSE; 2Kxb(q"  
 } v93b8/1  
 …… //其它处理及默认处理 ]\yIHdcDi  
} Ib(C`4%  
;c 7I "?@z  
prJd'  
  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。 5U 84 *RY  
U,rI/'  
  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。 H,> }t S  
d) -(C1f  
  二、编程步骤 jcCAXk055  
lm`*x=x  
  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"; 54 $^ldD  
Y9.3`VX  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 2Zu9? L ,I  
dL42)HP5  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; {"o9pIh{~  
%. 1/ #{  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; v :pT(0N  
1}VaBsEV  
  5、 添加代码,编译运行程序。 \8CCa(H  
>}SEU-7&\  
三、程序代码 pGie!2T E  
'54\!yQ<{  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL =, XCjiBeC  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) @pH2"k| @  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ -%fQr5  
#if _MSC_VER > 1000 4"&-a1N  
#pragma once (\:Rnl  
#endif // _MSC_VER > 1000  y|LHnNQ  
#ifndef __AFXWIN_H__ /^=1]+_!  
#error include 'stdafx.h' before including this file for PCH k*1Lr\1  
#endif \M`qaFan5^  
#include "resource.h" // main symbols xe@e#9N$  
class CHookApp : public CWinApp @eYpARF  
{ #:6-O  
 public: 2 ZK]}&yC  
  CHookApp(); UyGo0POW  
  // Overrides 45~x #Q  
  // ClassWizard generated virtual function overrides q1ysT.{p,  
  //{{AFX_VIRTUAL(CHookApp) )zL@h  
 public: Q<sqlh!h  
  virtual BOOL InitInstance(); J 2O,wb)U  
  virtual int ExitInstance(); KjGu !B  
  //}}AFX_VIRTUAL a_N7X  
  //{{AFX_MSG(CHookApp) Us`=^\  
  // NOTE - the ClassWizard will add and remove member functions here. x?AG*' h&  
  // DO NOT EDIT what you see in these blocks of generated code ! yY VR]HH  
  //}}AFX_MSG 1I%u)[;>  
  DECLARE_MESSAGE_MAP() .fWy\ r0  
}; )^:H{1'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); m]qw8BoU`F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =-sTV\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u`|%qRt  
BOOL InitHotkey(); ~[CFs'`(2  
BOOL UnInit(); ;L-=z]IR,  
#endif Sz5t~U=G  
9=j9vBV  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ~kW?]/$h  
#include "stdafx.h" JBY.er`6C  
#include "hook.h" Nh\vWAz9  
#include <windowsx.h> 'rhgM/I  
#ifdef _DEBUG Lu#qo^  
#define new DEBUG_NEW yTZev|ej@  
#undef THIS_FILE |))NjM'ZBl  
static char THIS_FILE[] = __FILE__; ' i+L  
#endif tpWGmj fo>  
#define MAX_KEY 100 B&cIx~+  
#define CTRLBIT 0x04 3=enk0$  
#define ALTBIT 0x02 ;!<}oZp{  
#define SHIFTBIT 0x01 /+*"*Br/  
#pragma data_seg("shareddata") bZ* = fdh  
HHOOK hHook =NULL; }4 0T'y  
UINT nHookCount =0; TOwqr T/  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey w)dnmrKDZg  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT uj.i(U s  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey P%|~Ni_BTX  
static int KeyCount =0; /A{ Zf'DI  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ]N'3jf`W  
#pragma data_seg() K P]ar.  
HINSTANCE hins; hYoUZ'4  
void VerifyWindow(); {/QVs?d  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) <-I69`  
//{{AFX_MSG_MAP(CHookApp) --$* q"  
// NOTE - the ClassWizard will add and remove mapping macros here. =WTSaC  
// DO NOT EDIT what you see in these blocks of generated code! XIwJhsYZ'9  
//}}AFX_MSG_MAP -,8LL@_  
END_MESSAGE_MAP() fJS:46  
P&0eu  
CHookApp::CHookApp() dlYpbw}W&<  
{ AE rPd)yk0  
 // TODO: add construction code here, lDL&":t  
 // Place all significant initialization in InitInstance `2Pa{g- .  
} t/;2rIx>  
v@qP &4Sp  
CHookApp theApp; XPdmz!,b  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) kqBZsfF  
{ Fi``l )Tt  
 BOOL bProcessed=FALSE; xF8r+{_J)  
 if(HC_ACTION==nCode) 5%}e j)@  
 { ^ oi']O  
  if((lParam&0xc0000000)==0xc0000000){// Key up R'Jrbe|  
   switch(wParam) S;4:`?s=i  
   { ]oP1c-GEk  
    case VK_MENU: !|[rh,e]  
     MaskBits&=~ALTBIT; 4>,X.|9{  
     break; GD4S/fn3  
    case VK_CONTROL: C hF~  
     MaskBits&=~CTRLBIT; Y-ao yoNS  
     break; 5%jhVys23  
    case VK_SHIFT: <Y yE1 |  
     MaskBits&=~SHIFTBIT; (%6fMVp  
     break; %7ngAIg  
    default: //judge the key and send message hTDK[4e  
     break; {s8c@-'  
   } w;lpJ B\  
   for(int index=0;index<MAX_KEY;index++){ /h>g-zb  
    if(hCallWnd[index]==NULL) ~nA k-toJ  
     continue; O},}-%G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Tz1^"tx9  
    { i(4<MB1a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); }Ulxt:}   
     bProcessed=TRUE; r `PJb5^\|  
    } %#2$B+  
   } Z|t=t"6"  
  } s+:|b~  
  else if((lParam&0xc000ffff)==1){ //Key down $cSUB  
   switch(wParam) }a;xs};X;  
   { B%tF|KKj  
    case VK_MENU: $7q3[skH  
     MaskBits|=ALTBIT; yXU.PSG*  
     break; nQc,^A)I  
    case VK_CONTROL: +4 k=Y  
     MaskBits|=CTRLBIT; 4Fg2/O_3  
     break; x*1wsA  
    case VK_SHIFT: ~e}JqJ(97  
     MaskBits|=SHIFTBIT; P) vD?)Q  
     break; A|ZT ;\  
    default: //judge the key and send message JX&U?Z  
     break; 3L&:  
   } 3m>YR-n$  
   for(int index=0;index<MAX_KEY;index++) oh{>nwH  
   { 7DAP_C  
    if(hCallWnd[index]==NULL) w5>[hQR\  
     continue; .8YxEnXw)(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) QP\9#D~  
    { .lcp5D[(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); IAO5li3  
     bProcessed=TRUE; k!Yc_ZB:*l  
    } cC-8.2  
   } RRja{*R  
  } Kn^+kHh:  
  if(!bProcessed){ ^*AI19w!Ys  
   for(int index=0;index<MAX_KEY;index++){ U<'N=#A J  
    if(hCallWnd[index]==NULL) VlV X  
     continue; h%EeU 3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) S70#_{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Jj=qC{]  
   } KZ5%q.  
  } AqgY*"A7  
 } >/n];fl>8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 8"&!3_  
} |S!R Q-CF  
f\2IKpF2  
BOOL InitHotkey() <D |&)/#  
{ 9VW/Af  
 if(hHook!=NULL){ k{2Gq1S{  
  nHookCount++; /"e@rnn  
  return TRUE; s*PKr6X+  
 } <1*kXTN(  
 else "}71z  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); =f~<*wQ  
  if(hHook!=NULL) I~6) Gk&  
   nHookCount++; CQ2vFg3+o  
  return (hHook!=NULL); RZHfT0*jL  
} {.LJ(|(Mz  
BOOL UnInit() RL}?.'!  
{ 5len} ){  
 if(nHookCount>1){ )^(gwE  
  nHookCount--; *tv&=  
  return TRUE; K+~?yOQj  
 } ?;l@yx  
 BOOL unhooked = UnhookWindowsHookEx(hHook); M8-8 T  
 if(unhooked==TRUE){ M@T{uo  
  nHookCount=0; J_7w _T/  
  hHook=NULL; Q^ W,)%  
 } %V=%ARP|  
 return unhooked; DzR,ou  
} ! yJ0A m>  
0BXr[%{`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) eay|>xa2  
{ Un]wP`  
 BOOL bAdded=FALSE; ! t!4CY  
 for(int index=0;index<MAX_KEY;index++){ DQ8/]Z{H  
  if(hCallWnd[index]==0){ 0h1u W26^  
   hCallWnd[index]=hWnd; Y*BmBRN  
   HotKey[index]=cKey; Jh.~]\u  
   HotKeyMask[index]=cMask; k@7#8(3  
   bAdded=TRUE; w>B}w  
   KeyCount++; OkC.e')Vx  
   break; vhF9|('G  
  } +JI,6)Ry  
 } 'u.Dt*.Uq  
 return bAdded; !/,oQoG  
} x{;{fMN1  
5$ik|e^:y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) G y[5'J`  
{ ir6aV|ea!  
 BOOL bRemoved=FALSE; ku,{NY f^Y  
 for(int index=0;index<MAX_KEY;index++){ O[ z0+Q?6Z  
  if(hCallWnd[index]==hWnd){ $T K*w8@:  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ z6w'XA1_+t  
    hCallWnd[index]=NULL; "" UyfC[  
    HotKey[index]=0; K#k/t"r  
    HotKeyMask[index]=0; -. *E<%  
    bRemoved=TRUE; ?jR#txR  
    KeyCount--; wnC-~&+6  
    break; e\X[\ve  
   } /rpr_Xw}  
  } ^1){ @(  
 } 6 5zx<  
 return bRemoved; hr]+ 4!/  
} y CHOg  
VKPEoy8H  
void VerifyWindow() wa,`BAKJ+F  
{ *w;?&)8%  
 for(int i=0;i<MAX_KEY;i++){ S }`f&  
  if(hCallWnd!=NULL){ 4P#jMox  
   if(!IsWindow(hCallWnd)){ >8/Otg+h  
    hCallWnd=NULL; M.Q HE2  
    HotKey=0; bqH [-mu6  
    HotKeyMask=0; uQ3sRJi  
    KeyCount--; uNI&U7_"  
   } |]<#![!h#  
  } +7%?p"gEY\  
 } n#}@| "J  
} T"P}`mT  
z#!<[**&  
BOOL CHookApp::InitInstance() KAZ<w~55c  
{ 2 K_ QZ  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); <N<0?GQ  
 hins=AfxGetInstanceHandle(); AO`@ &e]o  
 InitHotkey(); EPW4 h/I  
 return CWinApp::InitInstance(); |-6`S1.  
} Z4G%Ve[  
^GV'Y  
int CHookApp::ExitInstance() Xj]9/?B?  
{ !Fs$W  
 VerifyWindow();  p[&J l  
 UnInit(); wDi/oH/H  
 return CWinApp::ExitInstance(); wxB HlgK4z  
} r3x;lICx-  
'?$@hqQn  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file D)G oWt  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) |};d:LwX  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_  gwIR3u  
#if _MSC_VER > 1000 nZ=[6?  
#pragma once ;S^"Y:7)  
#endif // _MSC_VER > 1000 Z?S?O#FED  
Q^<amM!  
class CCaptureDlg : public CDialog waz5+l28  
{ `\:Ede  
 // Construction 2wO8;wiA  
 public: 78]*Jx>L  
  BOOL bTray; a9&[Qv5-/  
  BOOL bRegistered; \roJf&O }  
  BOOL RegisterHotkey(); pGU .+[|(  
  UCHAR cKey; UQkd$w<  
  UCHAR cMask; #<Y3*^~5d  
  void DeleteIcon(); Ruq;:5u  
  void AddIcon(); 3KqRw (BK  
  UINT nCount; m^BXLG:b  
  void SaveBmp(); 5vD\?,f E  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor sh,4n{+  
  // Dialog Data RCa1S^.  
  //{{AFX_DATA(CCaptureDlg) e\(X:T  
  enum { IDD = IDD_CAPTURE_DIALOG }; k t`ln  
  CComboBox m_Key; _fgsHx>l7  
  BOOL m_bControl; /Q9Cvj)"  
  BOOL m_bAlt; 6t!=k6`1  
  BOOL m_bShift; 512p\x@  
  CString m_Path; uB\UIz)e  
  CString m_Number; w8 S pt  
  //}}AFX_DATA ,y"vf^BE.  
  // ClassWizard generated virtual function overrides +EA ")T<l  
  //{{AFX_VIRTUAL(CCaptureDlg) F%zMhX'AG  
 public: [,st: Y  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 3W ]zLUn  
 protected: uN?Lz1W\;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6VQQI9  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); yU(}1ZID  
  //}}AFX_VIRTUAL N (\n$bpTt  
  // Implementation 5jK|  
 protected: (eb65F@P  
  HICON m_hIcon; k"7ZA>5jk  
  // Generated message map functions CUTjRWQ  
  //{{AFX_MSG(CCaptureDlg) 8T.bT6  
  virtual BOOL OnInitDialog(); m%eCTpYo  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); = ZoNkj/^,  
  afx_msg void OnPaint(); D$KP>G  
  afx_msg HCURSOR OnQueryDragIcon(); | J'k 9W"  
  virtual void OnCancel(); RpU i'  
  afx_msg void OnAbout(); Tn,_0  
  afx_msg void OnBrowse(); 8S#&XS>o  
  afx_msg void OnChange(); iiuT:r  
 //}}AFX_MSG x]Nx,tt  
 DECLARE_MESSAGE_MAP() |H8C4^1Rq  
}; Uun0FCA>  
#endif )6"p@1\u  
BGVnL}0  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file GLub5GrxR  
#include "stdafx.h" _)LXD,LA  
#include "Capture.h" k 5% )  
#include "CaptureDlg.h" S_*Gv O  
#include <windowsx.h> rpEIDhHv  
#pragma comment(lib,"hook.lib") F@z%y'5 Z*  
#ifdef _DEBUG *Q2 oc:6  
#define new DEBUG_NEW _UP 9b@Z"  
#undef THIS_FILE /Xc9}~t6  
static char THIS_FILE[] = __FILE__; 1fJ~Wp @1  
#endif N DI4EA~z  
#define IDM_SHELL WM_USER+1 2 N(Z^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3J8>r|u;1'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ADxje%!1O  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 08AD~^^  
class CAboutDlg : public CDialog TUGD!b{  
{ 82)=#ye_P  
 public: X?ZLmP7|  
  CAboutDlg(); 7C Sn79E  
  // Dialog Data ,6^Xn=o #  
  //{{AFX_DATA(CAboutDlg) :Eh}]_  
  enum { IDD = IDD_ABOUTBOX }; GXLh(d!C  
  //}}AFX_DATA uZf 6W<a  
  // ClassWizard generated virtual function overrides ~tL:r=  
  //{{AFX_VIRTUAL(CAboutDlg) g>7i2  
 protected: 67H?xsk@n  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support REcKfJTj  
  //}}AFX_VIRTUAL bFG?mG:  
  // Implementation {[bpvK  
 protected: n}9<7e~/  
  //{{AFX_MSG(CAboutDlg) 9I5AYa?  
  //}}AFX_MSG L|D9+u L  
  DECLARE_MESSAGE_MAP() npytb*[|c  
}; : maBec)  
usKP9[T$  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 9%R"(X)  
{ nT~XctwF  
 //{{AFX_DATA_INIT(CAboutDlg) v0!(&g 3Sd  
 //}}AFX_DATA_INIT | h"$  
} [SKDsJRPP  
O\oRM2^u}  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 1f"}]MbLR  
{ [".94(qs  
 CDialog::DoDataExchange(pDX); XdzC/ {G  
 //{{AFX_DATA_MAP(CAboutDlg) 8.%wnH  
 //}}AFX_DATA_MAP G.N `  
} f `b6E J  
$t6t 6<M)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) SY.koW  
 //{{AFX_MSG_MAP(CAboutDlg) g@t..xJ,  
 // No message handlers `6YN/"unfp  
 //}}AFX_MSG_MAP ]m &Ss  
END_MESSAGE_MAP() ?|`n&HrP  
Az(,Q$"|5  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) gDw(_KC  
: CDialog(CCaptureDlg::IDD, pParent) ,9F3~Ryt(  
{ ^G5fs'd  
 //{{AFX_DATA_INIT(CCaptureDlg) qUg/mdv&  
  m_bControl = FALSE; EKw)\T1  
  m_bAlt = FALSE; -ciwIS9L  
  m_bShift = FALSE; z 36Y/{>[  
  m_Path = _T("c:\\"); Uw5&.aqn.b  
  m_Number = _T("0 picture captured."); {w ,^Z[<  
  nCount=0; a>6M{C@pd  
  bRegistered=FALSE; Mx# P >.  
  bTray=FALSE; fS8Pi,!  
 //}}AFX_DATA_INIT V'za,.d-  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 xrlyph5mE  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); (Xz q(QV  
} z#n+iC$9  
SEu:31k{o  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX)  SN}3  
{ Xrc{w Dn  
 CDialog::DoDataExchange(pDX); -nD} k  
 //{{AFX_DATA_MAP(CCaptureDlg) S,'ekWVD  
  DDX_Control(pDX, IDC_KEY, m_Key); :YLYCVi|  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); GsD?Z%t~%  
  DDX_Check(pDX, IDC_ALT, m_bAlt); o5+7Lt]  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); $QT% -9&  
  DDX_Text(pDX, IDC_PATH, m_Path); E+ XR[p  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 7bVKH[  
 //}}AFX_DATA_MAP >$3 =yw%  
} Du-Q~I6  
U(~Nmo'  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ,Cy&tRjR B  
//{{AFX_MSG_MAP(CCaptureDlg) m<;MOS  
 ON_WM_SYSCOMMAND() ulEtZ#O{_  
 ON_WM_PAINT() ~dgFr6  
 ON_WM_QUERYDRAGICON() 5YUe>P D  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) +,i_G?eX  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) U`{ M1@$  
 ON_BN_CLICKED(ID_CHANGE, OnChange) MP )nQ  
//}}AFX_MSG_MAP r' |ei,  
END_MESSAGE_MAP() wXYT(R  
!WB3%E,I  
BOOL CCaptureDlg::OnInitDialog() >*|Eyv_  
{ *Hv d  
 CDialog::OnInitDialog(); DU5rB\!.~  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ^|!\IzDp  
 ASSERT(IDM_ABOUTBOX < 0xF000); e-xT.RnQ  
 CMenu* pSysMenu = GetSystemMenu(FALSE); AXo)(\  
 if (pSysMenu != NULL) G!D~*B9 G  
 { ]r#NjP  
  CString strAboutMenu; 96gaun J  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Sl \EPKZD  
  if (!strAboutMenu.IsEmpty()) FELW?Q?k  
  { ,&@FToR  
   pSysMenu->AppendMenu(MF_SEPARATOR); SM<qb0  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;ae6h [  
  } Kr4%D*  
 } O "Aeg|  
 SetIcon(m_hIcon, TRUE); // Set big icon ,z((?h,nm  
 SetIcon(m_hIcon, FALSE); // Set small icon Vrp]YR L`  
 m_Key.SetCurSel(0); f8f|'v|  
 RegisterHotkey(); O`~L*h_  
 CMenu* pMenu=GetSystemMenu(FALSE); S!iDPl~  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); # ?u bvSdU  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ?]}=4  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); D{+D.4\  
 return TRUE; // return TRUE unless you set the focus to a control 1P BnGQYM  
} F=UW[zy/[  
COH.`Tv{*  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #S|On[Q!  
{ h`tf!MD]  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) +~;#!I@Di  
 { !_&;#j](  
  CAboutDlg dlgAbout; 1@+&6UC  
  dlgAbout.DoModal(); mm | *  
 } ])zpx-  
 else ]go.IfH  
 { nF 'U*  
  CDialog::OnSysCommand(nID, lParam); :mdoGb$ dr  
 } V* ,u;*  
} b#S-u }1PE  
YIl,8! z~  
void CCaptureDlg::OnPaint() %!L*ec%,  
{ |A H@W#7j  
 if (IsIconic()) \J6e/ G  
 { GlT/JZ9  
  CPaintDC dc(this); // device context for painting S2=x,c$  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); <1U *{y  
  // Center icon in client rectangle X(>aW*q  
  int cxIcon = GetSystemMetrics(SM_CXICON); D6P/39}W  
  int cyIcon = GetSystemMetrics(SM_CYICON); Z~"8C Kz  
  CRect rect; 7P52r  
  GetClientRect(&rect); 'f.5hX(Y  
  int x = (rect.Width() - cxIcon + 1) / 2; H_%ae' W  
  int y = (rect.Height() - cyIcon + 1) / 2; <9Ytv|t@0  
  // Draw the icon L\t!)X-4  
  dc.DrawIcon(x, y, m_hIcon); 4DGKZh'm"  
 } \JF 2'm\M  
 else ><)fK5x  
 { ?bG82@-  
  CDialog::OnPaint(); j2#B l  
 } bWB&8&p  
} 49B6|!&I  
.R@euIva  
HCURSOR CCaptureDlg::OnQueryDragIcon() uF T5Z  
{ c+<gc:#jy  
 return (HCURSOR) m_hIcon; _b[Pk;8}j;  
} \@7 4I7  
&KeD{M%  
void CCaptureDlg::OnCancel() ZD8E+]+  
{ b$B-LvHd1  
 if(bTray)  Z Mf,3  
  DeleteIcon(); O$Dj_R#  
  CDialog::OnCancel(); J]&nZud`  
} 2u} ns8wn  
e/IVZmUn^  
void CCaptureDlg::OnAbout() H4e2#]*i7  
{ z|N*Gs>,  
 CAboutDlg dlg; CDFkH  
 dlg.DoModal(); \H/}| ^+@  
} .1""U ']  
i# Fe`Z ~J  
void CCaptureDlg::OnBrowse() ^aL> /'Y#|  
{ 95-%>?4  
 CString str; bj+foNvu\  
 BROWSEINFO bi; *18J$  
 char name[MAX_PATH]; 8j@ADfZ9  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); GF*E+/ ;  
 bi.hwndOwner=GetSafeHwnd(); V8z*mnD  
 bi.pszDisplayName=name; {?uswbk.  
 bi.lpszTitle="Select folder"; ^}hSsE  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; x1QL!MB  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Ua>.k|>0  
 if(idl==NULL) V5]\|?=  
  return; rK cr1VFy  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); zm^ 5WH  
 str.ReleaseBuffer(); z%/<|`  7  
 m_Path=str; +L}R|ihkI  
 if(str.GetAt(str.GetLength()-1)!='\\') NJ!}(=1|K  
  m_Path+="\\"; A@I3:V  
 UpdateData(FALSE); j!?bE3r~  
} g7]g0*gxXW  
!%G;t$U=M  
void CCaptureDlg::SaveBmp()  ev(E  
{ H~ =;yy  
 CDC dc; 4' <y  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); C3 (PI,,  
 CBitmap bm; BlfW~l'mx  
 int Width=GetSystemMetrics(SM_CXSCREEN); c *Pt;m  
 int Height=GetSystemMetrics(SM_CYSCREEN); 5ZHO+@HiFH  
 bm.CreateCompatibleBitmap(&dc,Width,Height); wRE2rsXoU  
 CDC tdc; 9B1bq#  
 tdc.CreateCompatibleDC(&dc); [AAIBb +U  
 CBitmap*pOld=tdc.SelectObject(&bm); @S  Quc  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Y/34~lhyl  
 tdc.SelectObject(pOld); } 71 9_DF  
 BITMAP btm; <h1J+  
 bm.GetBitmap(&btm); U{-[lpd  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; c}#(,<8X  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); @-}!o&G0  
 BITMAPINFOHEADER bih; Z+! 96LR  
 bih.biBitCount=btm.bmBitsPixel; -<gQ>`(0  
 bih.biClrImportant=0; v!rOT/I  
 bih.biClrUsed=0; H?dEgubg7]  
 bih.biCompression=0; o(Ro/U(Wu  
 bih.biHeight=btm.bmHeight; Sy34doAZ  
 bih.biPlanes=1; [E/^bM+  
 bih.biSize=sizeof(BITMAPINFOHEADER); F#\+.inO  
 bih.biSizeImage=size;  B*Q  
 bih.biWidth=btm.bmWidth; C= PV-Ul+  
 bih.biXPelsPerMeter=0; iMs(Ywak]  
 bih.biYPelsPerMeter=0; +P"u1q*+p  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); e\i}@]  
 static int filecount=0; (`K ~p Z  
 CString name; ;JR_z'<  
 name.Format("pict%04d.bmp",filecount++); bn"z&g   
 name=m_Path+name; ~1.~4~um  
 BITMAPFILEHEADER bfh; ; WsV.n  
 bfh.bfReserved1=bfh.bfReserved2=0; f n\&%`U  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ~Uaz;<"j0  
 bfh.bfSize=54+size; bR|1* <  
 bfh.bfOffBits=54; <fcw:Ae  
 CFile bf; xT3l>9i  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Dlu]4n[LB  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); /pnQKy.  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); zH?&FtO  
  bf.WriteHuge(lpData,size); ~dj4Q eu  
  bf.Close(); .2STBh.;  
  nCount++; jQ\/R~)O  
 } I K Dh)Zm  
 GlobalFreePtr(lpData); i]n ?zWo_h  
 if(nCount==1) . aqP=  
  m_Number.Format("%d picture captured.",nCount); =J&aN1Hgt  
 else bR? $a+a)  
  m_Number.Format("%d pictures captured.",nCount); vke]VXU9z  
  UpdateData(FALSE); d`4@aoM  
} rwep e5  
FuZLE%gP  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) gT4H? #UB  
{ =)y=39&;/  
 if(pMsg -> message == WM_KEYDOWN) lIL{*q(  
 { aQhr$aH  
  if(pMsg -> wParam == VK_ESCAPE) >d#6qXKAU  
   return TRUE; } T<oLvS  
  if(pMsg -> wParam == VK_RETURN) 4xNzhnp|  
   return TRUE; 1`8(O >5  
 } oq}Q2[.b  
 return CDialog::PreTranslateMessage(pMsg); vH9Gf  
} t>>\U X  
Yo#F;s7  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (Qys`D   
{ }X*.Vv A  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ )VCRbz"[g  
  SaveBmp(); /2PsC*y  
  return FALSE; * ;C8g{  
} zE<GwVI~  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2wG4"  
 CMenu pop; s|=.L&"   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); =D~RIt/D  
 CMenu*pMenu=pop.GetSubMenu(0); C:d$   
 pMenu->SetDefaultItem(ID_EXITICON); #NLLl EE  
 CPoint pt; az ?2  
 GetCursorPos(&pt); $C !Mk  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Eq?d+s>  
 if(id==ID_EXITICON) cxQ8/0^  
  DeleteIcon(); p~THliwd  
 else if(id==ID_EXIT) -#?p16qz5  
  OnCancel(); (Eoji7U  
 return FALSE; g?caE)  
} 0Ku%9wh-  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); HR83{B21  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ePJtdKN:  
 AddIcon(); !56gJJ-r  
 return res; R]{AJ"p  
} NQ(}rr'.  
g"Z X1X  
void CCaptureDlg::AddIcon() +~A<&7[}  
{ #%i-{t+_>  
 NOTIFYICONDATA data; b,#E.%SLw  
 data.cbSize=sizeof(NOTIFYICONDATA); p;rG aLo:u  
 CString tip; {1ic* cZS  
 tip.LoadString(IDS_ICONTIP); +vtI1LC;_  
 data.hIcon=GetIcon(0); p@7[w@B\c  
 data.hWnd=GetSafeHwnd(); UPkD^D,  
 strcpy(data.szTip,tip); .%4{zaB  
 data.uCallbackMessage=IDM_SHELL; :{v:sK  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; rpT{0 >5  
 data.uID=98; UMJ>6 Ko8  
 Shell_NotifyIcon(NIM_ADD,&data); KGm"-W  
 ShowWindow(SW_HIDE); W<D(M.61A  
 bTray=TRUE; 7+I2" Hy  
} _(8HK  
h7S&tW GU  
void CCaptureDlg::DeleteIcon() wB;'+d&  
{ zz4A,XrD  
 NOTIFYICONDATA data; @pD']=d}t  
 data.cbSize=sizeof(NOTIFYICONDATA); Bu$GCSrX  
 data.hWnd=GetSafeHwnd(); VoJelyzh  
 data.uID=98; <IBzh_  
 Shell_NotifyIcon(NIM_DELETE,&data); 9GZKT{*  
 ShowWindow(SW_SHOW); [af<FQ{  
 SetForegroundWindow(); KD~F5aS`[  
 ShowWindow(SW_SHOWNORMAL); NX(.Lw}  
 bTray=FALSE; '?~k`zK  
} L_rKVoKjt  
a,U =irBA  
void CCaptureDlg::OnChange() %8V/QimHU  
{ 1+^L,-k!  
 RegisterHotkey(); Xx0}KJ q~"  
} _;B N;].  
k'BLos1W  
BOOL CCaptureDlg::RegisterHotkey() Ek,s6B)'d  
{ f9FsZD  
 UpdateData(); 2Ax HhD.  
 UCHAR mask=0; Tdr^~dcQ  
 UCHAR key=0; [-sE:O`yt  
 if(m_bControl) kE".v|@  
  mask|=4; @:. 6'ji,`  
 if(m_bAlt) gi7As$+E  
  mask|=2; 66%#$WH#  
 if(m_bShift)  F%6`D  
  mask|=1; X3:-+]6,d  
  key=Key_Table[m_Key.GetCurSel()]; j]"Yz t~u  
 if(bRegistered){ UP]J `\$o  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); m GWT</=[$  
  bRegistered=FALSE; OZ q/'*  
 } WbS2w @8  
 cMask=mask; <bf^'$l  
 cKey=key; <&o `T4  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); }q(IKH\&  
 return bRegistered; 0=8.8LnN(  
} e3wFi,/@  
qfY.X&]PU  
  四、小结 |Js96>B:  
(0qdU;  
  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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