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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: ocwRU0+j  
  Yck(Fl  
  一、实现方法 w5"C<5^  
jqHg'Fq  
  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: X#mm Z;P  
Z(AI]wk3<  
#pragma data_seg("shareddata") 11}fPWK  
HHOOK hHook =NULL; //钩子句柄 .?b2Bd!MC  
UINT nHookCount =0; //挂接的程序数目 .fxI)  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 CQfrAk4mu  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?4=8z8((!  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey D%cWw0Oq  
static int KeyCount =0; o uKID_ '  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 HxJKS*H;  
#pragma data_seg() qPdNI1 |  
-X(%K6{  
  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。 EzY?=<Y(  
7G}vQO  
  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: za7h.yK}  
IWN:GFH(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR h d1H  
cKey,UCHAR cMask) yvo~'k#c  
{ '01H8er  
 BOOL bAdded=FALSE; |i-Qfpn  
 for(int index=0;index<MAX_KEY;index++){ xKKL4ws  
  if(hCallWnd[index]==0){ D3yG@lIP3  
   hCallWnd[index]=hWnd; ~1YL  
   HotKey[index]=cKey; *&B1(&{:V  
   HotKeyMask[index]=cMask; D"fE )@Q@Y  
   bAdded=TRUE; WlP#L`  
   KeyCount++; MP,l*wVd  
   break; rAD5n, M]  
  } QLo^6S5!  
 } W5*%n]s~  
 return bAdded; kNfqdCF{P  
} k{n*[)m  
//删除热键 pRmnS;*z&  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) j[YzBXd V  
{ K g&{ ?&  
 BOOL bRemoved=FALSE; y|b|_eE?{  
 for(int index=0;index<MAX_KEY;index++){ B+|E|8"  
  if(hCallWnd[index]==hWnd){ p8y_uN QE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ /zn|?Y[  
    hCallWnd[index]=NULL; PPT"?lt*&  
    HotKey[index]=0; )NZ6!3[@  
    HotKeyMask[index]=0; I ,Q"<? &  
    bRemoved=TRUE; /h%<e  
    KeyCount--; v'*Q[ ('  
    break; k%#`{#n i  
   } VtF^; f  
  } }(O/y-  
 } !_s|h@  
 return bRemoved; hNUAwTH6  
} ^[XxE Lx  
5gW`;Cdbyc  
HTI1eLZ2  
  DLL中的钩子函数如下: c+AZ(6O ?\  
1(M0C[P  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )'\Jp 7*3  
{ L7mN&Xr  
 BOOL bProcessed=FALSE; \Q{@AC<?i  
 if(HC_ACTION==nCode) qEKTSet?  
 { HyXw^ +tsj  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 "!XeK|Wi  
   switch(wParam) m}0US;c#f  
   {  B{!)GZ(}  
    case VK_MENU: NAhV8  
     MaskBits&=~ALTBIT; ed*Cx~rT  
     break; joDnjz=  
    case VK_CONTROL: 6cSMKbgZJ  
     MaskBits&=~CTRLBIT; zfL$z,zgf  
     break; (,Yb]/O*  
    case VK_SHIFT: ws tI8">  
     MaskBits&=~SHIFTBIT; I#@iA!  
     break; #(h~l> r  
    default: //judge the key and send message )eGGA6G  
     break; }GsZ)\!$4  
   } -h*Yd)  
   for(int index=0;index<MAX_KEY;index++){ #/@U|g  
    if(hCallWnd[index]==NULL) .%`|vGF  
     continue; )7=B]{B_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) P]T(I/\g  
    { X`]-) (U X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); G ;V@oT  
     bProcessed=TRUE; /dhx+K~  
    } 2F^ %d9`  
   } ;6t>!2I>C  
  } PC/fb-J  
  else if((lParam&0xc000ffff)==1){ //有键按下 ];6c/#2x  
   switch(wParam) :ORCsl6-  
   { wq_c^Ioy  
    case VK_MENU: l9 )iLOj  
     MaskBits|=ALTBIT; o^4qY  
     break; E!Hq%L!/  
    case VK_CONTROL: |8&AsQd  
     MaskBits|=CTRLBIT; a*CP1@O  
     break; >h<eEv/  
    case VK_SHIFT: f2_LfbvH  
     MaskBits|=SHIFTBIT; 5}9-)\8=z  
     break; k@5#^G  
    default: //judge the key and send message u1` 8f]qt  
     break; KpC)A5u6  
   } \^;Gv%E  
   for(int index=0;index<MAX_KEY;index++){ xC`Hm?kM  
    if(hCallWnd[index]==NULL) ]l+Bg;F#V  
     continue; Vv' e,m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) MTb}um.($  
    { n0U^gsD4J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9~zh]deH  
     bProcessed=TRUE; Zqd&EOm  
    } ,Ng3!2&$e  
   } K%qunjv  
  } {d}-SoxH  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 I"Ji_4QV  
   for(int index=0;index<MAX_KEY;index++){ /`hr)  
    if(hCallWnd[index]==NULL) p]`pUw{  
     continue; J=*y>Zt-b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  g}Hk4+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); tzi+A;>c(v  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 WRh&4[G'  
   } &[*_ -  
  } X~0l1 @!  
 } |/arxb&  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); aen(Mcd3bg  
} 8jqt=}b  
pW:h\}%`n  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: jCW>=1:JGY  
(&PamsV*8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'nP'MA9b;a  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^K@r!)We  
6\ux;lksn*  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: vc6UA%/f  
tt[P{mMQ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 98Srn63O  
{ h|=^@F_\`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) HCHP15otfe  
 { E}k#-+u<S4  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 eN/s W!:P|  
  SaveBmp(); {9;~xxTo  
  return FALSE; v7Knu]  
 } <ofXNv;`  
 …… //其它处理及默认处理 X$ /3  
} \q3H#1A  
tyP-J4J  
f*XF"@ZQV  
  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。 z$7YC49^  
edGV[=]F  
  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。 P(X#w  
PC\Xm,,  
  二、编程步骤 H xb{bF  
C>v    
  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{ eu_  
{Hp?rY@  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; kjNA~{  
Zt lS*id_  
  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; ] |u}P2  
kUP[&/Lc  
  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; 7;CeQx/W)W  
sB0+21'R  
  5、 添加代码,编译运行程序。 cnLC>_hY  
=#BeAsFfO  
三、程序代码 rO]C`bg  
1Dt"Rcn"4  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL X&wK<  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 4bAgbx-^  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 3Xd+>'H  
#if _MSC_VER > 1000 NnHwk)'  
#pragma once V]q{N-Iq  
#endif // _MSC_VER > 1000 u:HKmP;  
#ifndef __AFXWIN_H__  Xid>8  
#error include 'stdafx.h' before including this file for PCH Ub3,x~V  
#endif W**=X\"'  
#include "resource.h" // main symbols Vaha--QB  
class CHookApp : public CWinApp <ya'L&  
{ /@3+zpaw X  
 public: #H!~:Xu   
  CHookApp(); J3:P/n&  
  // Overrides tH_# q"@)  
  // ClassWizard generated virtual function overrides IE_@:]K}Ja  
  //{{AFX_VIRTUAL(CHookApp) v/m`rc]e  
 public: jQb=N%5s  
  virtual BOOL InitInstance(); IC}zgvcW  
  virtual int ExitInstance(); LrPDpTd  
  //}}AFX_VIRTUAL GC4$9q}C4Z  
  //{{AFX_MSG(CHookApp) JYSw!!eC  
  // NOTE - the ClassWizard will add and remove member functions here. ;Ly4Z*!2  
  // DO NOT EDIT what you see in these blocks of generated code ! T{)!>)  
  //}}AFX_MSG "*7I~.7U(*  
  DECLARE_MESSAGE_MAP() e\yj>tQJg  
}; UD9h5PgT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); $35Oyd3s<  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); e. [+xOu`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); aNq Vs|H  
BOOL InitHotkey(); etTuukq_Z  
BOOL UnInit(); r#Pd@SV  
#endif +uT=Wb \  
@W. `'b-  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. :+R5"my  
#include "stdafx.h" M  j5C0P(  
#include "hook.h" ZzKn,+  
#include <windowsx.h> BbU&e z8P  
#ifdef _DEBUG ADR`j;2  
#define new DEBUG_NEW [")0{LSA=  
#undef THIS_FILE l w%fY{  
static char THIS_FILE[] = __FILE__; kkJg/:g  
#endif jV<LmVcZY  
#define MAX_KEY 100 rW`F|F%  
#define CTRLBIT 0x04 UoLO#C0i  
#define ALTBIT 0x02 #e|eWi>  
#define SHIFTBIT 0x01 iEU(1?m2-  
#pragma data_seg("shareddata") Etl7V  
HHOOK hHook =NULL; '@fk(~|  
UINT nHookCount =0; &>s(f-\8  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey AoR`/tr,  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT &a|oJ'clz  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey TM"-X\e~{  
static int KeyCount =0; <=zGaU,  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift #zy%B  
#pragma data_seg() 0)P18n"$  
HINSTANCE hins; C$tSsw?A  
void VerifyWindow(); ':>B %k  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) hCDI;'ls  
//{{AFX_MSG_MAP(CHookApp) YLCwo]\+>  
// NOTE - the ClassWizard will add and remove mapping macros here. a6]!4  
// DO NOT EDIT what you see in these blocks of generated code! sW]n~kTt'  
//}}AFX_MSG_MAP N!m%~},s//  
END_MESSAGE_MAP() V`H#|8\i  
{$EXI]f  
CHookApp::CHookApp() @"~\[z5  
{ G` 8j ^H,  
 // TODO: add construction code here, r]E$uq bR  
 // Place all significant initialization in InitInstance c3}}cFe  
} w1}[lq@  
)F~_KD)7jJ  
CHookApp theApp; |.S;z"v![  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) [%@zH  
{ n-=\n6"P  
 BOOL bProcessed=FALSE; $bo^UYZ6  
 if(HC_ACTION==nCode) ^s?wnEo;j  
 { O[`Ob6Q{F  
  if((lParam&0xc0000000)==0xc0000000){// Key up >ciq4H43Q|  
   switch(wParam) [qXpi'q[  
   { 7'8O*EoB'  
    case VK_MENU: -m @s 9k  
     MaskBits&=~ALTBIT; -?]ltn9!  
     break; lvN{R{7 >  
    case VK_CONTROL: oby*.61?5l  
     MaskBits&=~CTRLBIT; ;+jp,( 7  
     break; {jVFlKP>  
    case VK_SHIFT: \8$`:3,@  
     MaskBits&=~SHIFTBIT; C=]3NB>Jc  
     break; =;`YtOL  
    default: //judge the key and send message w %zw+E  
     break; 6,7omYof  
   } U=t'>;(g  
   for(int index=0;index<MAX_KEY;index++){ VsmL#@E  
    if(hCallWnd[index]==NULL) +sI.GWQ_:  
     continue; a(7ryl~c=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xC{NIOYn'  
    { ~3%3{a a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); U\ L"\N7  
     bProcessed=TRUE; Z\L@5.*ydE  
    } _qg6( X  
   } %b?Pasf.  
  } &-* nr/xT  
  else if((lParam&0xc000ffff)==1){ //Key down Z`*cI   
   switch(wParam) $"i690  
   { vq s~a7E-P  
    case VK_MENU: ,,J3 h  
     MaskBits|=ALTBIT; C1/jA>XW  
     break; O<3,n;56Z  
    case VK_CONTROL:  n=&c5!  
     MaskBits|=CTRLBIT; 5;{Bdvcv  
     break; nT12[@:Tr  
    case VK_SHIFT: r#Mx~Zg~  
     MaskBits|=SHIFTBIT; W<4\4  
     break; 42u\Y_^ID  
    default: //judge the key and send message md`ToU  
     break; ]/bE${W*]  
   } i#lo? \PO>  
   for(int index=0;index<MAX_KEY;index++) ypd?mw&1}  
   { X2`>@GR/>  
    if(hCallWnd[index]==NULL) g@2.A;N0  
     continue; Z]Y4NO;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]Rye AJ3  
    { -1:Z^&e/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); SSXS  
     bProcessed=TRUE; d0B+syl&4l  
    } A|J\X=5  
   } OGFKc#  
  } !.9vW&t  
  if(!bProcessed){ =F&RQ}$   
   for(int index=0;index<MAX_KEY;index++){ [*G2wP[$  
    if(hCallWnd[index]==NULL) Fjzk;o  
     continue; @>]3xHE6#=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ~D5MAEazS  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `/zt&=`VB  
   } %Let AR  
  } /;4MexgB%  
 } [Mz;:/  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {H V,2-z  
} RuZ;hnE&  
='0!B]<G  
BOOL InitHotkey() vR$5ItnT  
{ ? st#6=M  
 if(hHook!=NULL){ 0I((UA/7Zs  
  nHookCount++; kKM%    
  return TRUE; b..$5  
 } Z-|C{1}A  
 else \DqxS=o;  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); vI'>$  
  if(hHook!=NULL) ~-`02  
   nHookCount++; Bs?F*,zDJ  
  return (hHook!=NULL); |esjhf}H>v  
} fO^6q1a  
BOOL UnInit() u`@f ~QP0  
{ h*UUtLi%WU  
 if(nHookCount>1){ P;%QA+%7  
  nHookCount--; Hz8`)cv`  
  return TRUE; f'OvG@  
 } n*~   
 BOOL unhooked = UnhookWindowsHookEx(hHook); ef&@aB  
 if(unhooked==TRUE){ %KF:- w  
  nHookCount=0; h<;[P?z  
  hHook=NULL; ap^=CEf   
 } Q ~JKKq  
 return unhooked; 6# ";W2  
} h&bV!M  
]Rh( =bg  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1fv~r@6s  
{ i[{] LiP  
 BOOL bAdded=FALSE; yrAzD=  
 for(int index=0;index<MAX_KEY;index++){ q-%KfZ@(|  
  if(hCallWnd[index]==0){ Ki/5xK=s  
   hCallWnd[index]=hWnd; Xp6*Y1Y  
   HotKey[index]=cKey; c)MR+'d\WO  
   HotKeyMask[index]=cMask; ]Cn*C{  
   bAdded=TRUE; EAw#$Aq=  
   KeyCount++; *t{c}Y&@  
   break; Pki4wDCTW  
  } "GI&S%F  
 } Ok~{@\  
 return bAdded; `?^w  
} -!,]Y10  
jHlOP,kc  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7/_ VE  
{ qYZ7Zt;  
 BOOL bRemoved=FALSE; Q5nyD/k4c  
 for(int index=0;index<MAX_KEY;index++){ w"agn}CK  
  if(hCallWnd[index]==hWnd){ / 7XdV  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~e77w\Q0  
    hCallWnd[index]=NULL; VhFRh,J(T  
    HotKey[index]=0; =veOVv[Q&/  
    HotKeyMask[index]=0; no NF;zT  
    bRemoved=TRUE; AH'4H."o/9  
    KeyCount--; A}bHfn|  
    break; eD{ @0&   
   } 8='21@wrN  
  } <nTmZ-;  
 } )]>G,.9C}  
 return bRemoved; QYfAf3te  
} ~}-p5q2  
uuYH6bw*d  
void VerifyWindow() #r.` V!=  
{ #oJbrh9J6  
 for(int i=0;i<MAX_KEY;i++){ yF5  
  if(hCallWnd!=NULL){ ht3T{4qCS  
   if(!IsWindow(hCallWnd)){ B9IXa;  
    hCallWnd=NULL; (GEi<\16[  
    HotKey=0; -*hb^MvP  
    HotKeyMask=0; R``V Q  
    KeyCount--; 9LO.8Jy  
   } } ndvV~*1  
  } K= Z]#bm  
 } "Dl9<EZ  
} {IPn\Bka  
;q,)NAr&  
BOOL CHookApp::InitInstance() b q3fiT9  
{ BQ9`DYIb  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); bI]UO)  
 hins=AfxGetInstanceHandle(); f:[d]J|  
 InitHotkey(); w}W@M,.^  
 return CWinApp::InitInstance(); &O6;nJEI  
} m/hi~. D9  
YNC0Z'c9  
int CHookApp::ExitInstance() qN1 -plY  
{ #EmffVtY  
 VerifyWindow(); R_>TEYZ  
 UnInit(); {8#N7(%z  
 return CWinApp::ExitInstance(); `+hy#1]  
} Md>f  
VyoE5o  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file o%+A<Ri  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) A_jB|<bjTP  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ X}j'L&{F@  
#if _MSC_VER > 1000 0?F@iB~1F  
#pragma once MeI2i  
#endif // _MSC_VER > 1000 &@W4^- 9  
2&gVZz  
class CCaptureDlg : public CDialog =EcIXDzC>  
{ p_5>?[TW:  
 // Construction #OD@q;  
 public: ! [|vx!p  
  BOOL bTray; cCh0?g7nV  
  BOOL bRegistered; J[<pZ [  
  BOOL RegisterHotkey(); WE5"A| =  
  UCHAR cKey; *{.&R9#7U'  
  UCHAR cMask; s0)qlm*  
  void DeleteIcon(); p&OJa$N$[  
  void AddIcon(); ^3WIl ]  
  UINT nCount; %on9C`/  
  void SaveBmp(); 9xK4!~5V  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor qX p,d  
  // Dialog Data 1akD]Z  
  //{{AFX_DATA(CCaptureDlg) 6)#- 5m  
  enum { IDD = IDD_CAPTURE_DIALOG }; rKzv8d  
  CComboBox m_Key; ayH%  qp  
  BOOL m_bControl; !$p2z_n$@.  
  BOOL m_bAlt; ti{H(;;@  
  BOOL m_bShift; ?)?IZ Qj  
  CString m_Path; V#zhG AMy.  
  CString m_Number; kJurUDo  
  //}}AFX_DATA { OxAY_  
  // ClassWizard generated virtual function overrides hsHVX[<5`  
  //{{AFX_VIRTUAL(CCaptureDlg) D%jD 8p  
 public: hi {2h04  
  virtual BOOL PreTranslateMessage(MSG* pMsg); _H4$$  
 protected: 9{O2B5u1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support KH2F#[ !Lw  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); vZ[ $H  
  //}}AFX_VIRTUAL ZVdsxo<  
  // Implementation .7pGx*WH^Y  
 protected: (>rS _#^  
  HICON m_hIcon; wR Xn9  
  // Generated message map functions t<!+b@l5  
  //{{AFX_MSG(CCaptureDlg) YQ8j  
  virtual BOOL OnInitDialog(); P\22op_te-  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); +}c|O+6g  
  afx_msg void OnPaint(); 4f4 i1i:  
  afx_msg HCURSOR OnQueryDragIcon(); P"R97#C  
  virtual void OnCancel(); Y!Uu173  
  afx_msg void OnAbout(); P Pwxk;  
  afx_msg void OnBrowse(); +  ZR(  
  afx_msg void OnChange(); ^MW\t4pZ  
 //}}AFX_MSG 9UeVvH  
 DECLARE_MESSAGE_MAP() "pSH!0Ap\  
}; r@*=|0(OrK  
#endif ,J~,ga~  
CB*`  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file O+G~Qp0b>  
#include "stdafx.h" WFU?o[k-O  
#include "Capture.h" 6keP':bt  
#include "CaptureDlg.h" z:Xj_ `p  
#include <windowsx.h> vp\PYg;x  
#pragma comment(lib,"hook.lib") ! Q|J']|  
#ifdef _DEBUG JqI6k6~Q^  
#define new DEBUG_NEW v!<PDw2'  
#undef THIS_FILE hmK8j l<6  
static char THIS_FILE[] = __FILE__; j+_S$T8w  
#endif ";wyNpb(  
#define IDM_SHELL WM_USER+1 .9T.3yQ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z:# .;wA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); M&uzOK+  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ps"/}u l  
class CAboutDlg : public CDialog x @1px&^  
{ tWpl`HH  
 public: KI E k/]<H  
  CAboutDlg(); gCv"9j<j  
  // Dialog Data cT/3yf  
  //{{AFX_DATA(CAboutDlg) gB(9vhj $  
  enum { IDD = IDD_ABOUTBOX }; Eyr5jXt%;  
  //}}AFX_DATA -Bo86t)F  
  // ClassWizard generated virtual function overrides *'Z-OY<V  
  //{{AFX_VIRTUAL(CAboutDlg) wrH7 pd  
 protected: jZXVsd  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -M"IVyy@  
  //}}AFX_VIRTUAL .cw!ls7d  
  // Implementation kRmj"9oA  
 protected: #V<`U:.  
  //{{AFX_MSG(CAboutDlg) n_<mPU  
  //}}AFX_MSG o;ik Z*+*  
  DECLARE_MESSAGE_MAP() :fxWz%t  
}; mWNR(()v  
S 3R|8?|  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 0Vf)Rw1%I  
{ B }6Kd  
 //{{AFX_DATA_INIT(CAboutDlg) pG0!ALT  
 //}}AFX_DATA_INIT (N,nux(0k  
} )r ULT$;i@  
$GQphXb$  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .W!tveX8-  
{ E;9Z\?P  
 CDialog::DoDataExchange(pDX); 8ou e-:/a  
 //{{AFX_DATA_MAP(CAboutDlg) t Y{; U#9  
 //}}AFX_DATA_MAP ; vMn/  
} _HwpPRVP/  
  7krh4  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) A 6:Q<  
 //{{AFX_MSG_MAP(CAboutDlg) QO@6VY@  
 // No message handlers  for {  
 //}}AFX_MSG_MAP sN-oEqS  
END_MESSAGE_MAP() ]5N zK=2{  
Z #EvRC  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 9x(}F<L  
: CDialog(CCaptureDlg::IDD, pParent) dPHw3^J0j  
{ <_t5:3HL  
 //{{AFX_DATA_INIT(CCaptureDlg) M^uU4My  
  m_bControl = FALSE; 8zAg;b [  
  m_bAlt = FALSE; 9X3yp:>V  
  m_bShift = FALSE; \4aKLr  
  m_Path = _T("c:\\"); Y:wF5pp;  
  m_Number = _T("0 picture captured."); !#.\QU|  
  nCount=0; sv' Gt1&"Z  
  bRegistered=FALSE; i!L;? `F{  
  bTray=FALSE; uMHRUi  
 //}}AFX_DATA_INIT L7m`HVCt&  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 JPLI @zX^  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 7ZQ'h3K  
} c -w0  
2\5cjdy  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) n? ]f@OR  
{ !Vb,zQ  
 CDialog::DoDataExchange(pDX); C,.-Q"juH  
 //{{AFX_DATA_MAP(CCaptureDlg) ms7SoY bSu  
  DDX_Control(pDX, IDC_KEY, m_Key); l2(.>-#  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); dN<5JQql  
  DDX_Check(pDX, IDC_ALT, m_bAlt); wk@yTTnb  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); +5-]iKh  
  DDX_Text(pDX, IDC_PATH, m_Path); XoJgs$3B  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 8^y=H=  
 //}}AFX_DATA_MAP vb %T7  
} ;,dkJ7M  
{EL'd!v7e  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) o_O+u%y  
//{{AFX_MSG_MAP(CCaptureDlg) EX4 C.C|d  
 ON_WM_SYSCOMMAND() l&3ki!  
 ON_WM_PAINT() dhW<p 5  
 ON_WM_QUERYDRAGICON() dnwdFsf  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) O4E(R?wd  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) l~['[Ub0)  
 ON_BN_CLICKED(ID_CHANGE, OnChange) YN^T$,*  
//}}AFX_MSG_MAP [^M|lf   
END_MESSAGE_MAP() x<@kjfm5  
HVGr-/  
BOOL CCaptureDlg::OnInitDialog() v J-LPTB  
{ S*g`d;8gV  
 CDialog::OnInitDialog(); UQ~4c,  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); AFm,CINa  
 ASSERT(IDM_ABOUTBOX < 0xF000); E+z18Lf?  
 CMenu* pSysMenu = GetSystemMenu(FALSE); =53b Lzr  
 if (pSysMenu != NULL) )tD6=Iz^5  
 { "XhOsMJ  
  CString strAboutMenu; *> KHRR<N  
  strAboutMenu.LoadString(IDS_ABOUTBOX); U{}!y3[wK  
  if (!strAboutMenu.IsEmpty()) Af9+HI O  
  { "J !}3)n  
   pSysMenu->AppendMenu(MF_SEPARATOR); yb?{LL-uy  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ]\BUoQ7I/  
  } a.DX%C /5  
 } [sj VRW-  
 SetIcon(m_hIcon, TRUE); // Set big icon G'9{a'  
 SetIcon(m_hIcon, FALSE); // Set small icon JOHR mfqR  
 m_Key.SetCurSel(0); k2p'G')H  
 RegisterHotkey(); Vho0e V=  
 CMenu* pMenu=GetSystemMenu(FALSE); q^*6C[G B  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); k" YHsn  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); j{;|g%5t  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); U^rm: *f  
 return TRUE; // return TRUE unless you set the focus to a control *,lh:  
} ax_YKJ5#P  
\QT9HAdd@  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 8;#AO8+U7)  
{ 6IP$n($2  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX)  rN"Xz  
 { P'tMu6+)  
  CAboutDlg dlgAbout; *d>vR1  
  dlgAbout.DoModal(); eh<rRx"[  
 } ]*;F. pZ  
 else Go <'  
 { [N:BM% FQ  
  CDialog::OnSysCommand(nID, lParam); ^PqMi:htc  
 } iCrxV{   
} #*2Rp8n  
~;unpym'  
void CCaptureDlg::OnPaint() 62kb2C  
{ `G?qY8  
 if (IsIconic()) 8Z#21X>  
 { AIh*1>2Xn  
  CPaintDC dc(this); // device context for painting _faJB@a_  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); \zu }\{  
  // Center icon in client rectangle \A<v=VM|  
  int cxIcon = GetSystemMetrics(SM_CXICON); k)":v3 ^  
  int cyIcon = GetSystemMetrics(SM_CYICON); }1U*A#aN7K  
  CRect rect; `f)(Y1%.  
  GetClientRect(&rect); 0pN{y}x,  
  int x = (rect.Width() - cxIcon + 1) / 2; 3taa^e.  
  int y = (rect.Height() - cyIcon + 1) / 2; 3SNL5  
  // Draw the icon a2yE:16o6  
  dc.DrawIcon(x, y, m_hIcon); eN/G i<  
 } wqy ^8N[K]  
 else %{C)1*M7  
 { >SDp uG&>  
  CDialog::OnPaint(); f^9&WT  
 } PZ,z15PG]  
} >uy%-aXiVa  
P`TIaP9%E  
HCURSOR CCaptureDlg::OnQueryDragIcon() JE!("]&  
{ =_PvrB2'  
 return (HCURSOR) m_hIcon; qC@Ar)T  
} EGS%C%>l/o  
>F3.c%VU]w  
void CCaptureDlg::OnCancel() Ld(NhB'7  
{ `4 UlJ4<`  
 if(bTray) T?npQA07=  
  DeleteIcon(); /IR#A%U  
  CDialog::OnCancel(); +\`rmI  
} 6GINmkA  
4:1)~z  
void CCaptureDlg::OnAbout() Mo^`\ /x!  
{ jN/ j\x'  
 CAboutDlg dlg; =;{^" #r\  
 dlg.DoModal(); ;h~er6&   
} |J3NR`-R  
(C S8(C4[  
void CCaptureDlg::OnBrowse() OM:v`<T!z  
{ q`Q}yE> 9  
 CString str; Y~qb;N\  
 BROWSEINFO bi; \VN=Ef\E  
 char name[MAX_PATH]; 5~r2sCDPk  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 'UfeluMd  
 bi.hwndOwner=GetSafeHwnd(); E5UcZ7  
 bi.pszDisplayName=name; ?)i1b\4Go  
 bi.lpszTitle="Select folder"; it1/3y =]  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; {1~T]5  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); usOx=^?=  
 if(idl==NULL) R1%y]]*-P  
  return; .y):Rh^  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); AK2WN#u@Z  
 str.ReleaseBuffer(); x(~<tX~  
 m_Path=str; IR$ (_9z  
 if(str.GetAt(str.GetLength()-1)!='\\') NL!9U,h5|  
  m_Path+="\\"; 3~%!m<1:  
 UpdateData(FALSE); -Mf Q&U   
} z"379b7cN  
T~k)uQ  
void CCaptureDlg::SaveBmp() !LIlt`ag9  
{ /1fwl5\  
 CDC dc; 6E^~n  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL);  `w<J25  
 CBitmap bm; QUOKThY?  
 int Width=GetSystemMetrics(SM_CXSCREEN); g1|w?pI1  
 int Height=GetSystemMetrics(SM_CYSCREEN); 3M<!?%v\A  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ~V+l_ :  
 CDC tdc; 3?E}t*/  
 tdc.CreateCompatibleDC(&dc); -t3i^&fj8  
 CBitmap*pOld=tdc.SelectObject(&bm); 3&*'6D Tg  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); tZho)[1  
 tdc.SelectObject(pOld); ]J@/p:S>  
 BITMAP btm; P!<[U!<hH  
 bm.GetBitmap(&btm); T+CajSV  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; /Ox)|) l  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); G]*|H0j  
 BITMAPINFOHEADER bih; `|Fp^gM  
 bih.biBitCount=btm.bmBitsPixel; Ceg!w#8Z,  
 bih.biClrImportant=0; "s_Z&  
 bih.biClrUsed=0; kGHC]Fb)  
 bih.biCompression=0; |_zO_Frtp  
 bih.biHeight=btm.bmHeight; bd \=h1  
 bih.biPlanes=1; MR;X&Up6!  
 bih.biSize=sizeof(BITMAPINFOHEADER); ~UPZ<  
 bih.biSizeImage=size; g.C5r]=+&  
 bih.biWidth=btm.bmWidth; }5bM1h#z  
 bih.biXPelsPerMeter=0; +nU.p/cK+\  
 bih.biYPelsPerMeter=0; 3-x%wD.  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); w*~Tm>U  
 static int filecount=0; 'uC59X4l  
 CString name; )bD nbO$s_  
 name.Format("pict%04d.bmp",filecount++); r@$ w*%  
 name=m_Path+name; 8cdsToF(e.  
 BITMAPFILEHEADER bfh; (:sZ b?*  
 bfh.bfReserved1=bfh.bfReserved2=0; U Cb02h  
 bfh.bfType=((WORD)('M'<< 8)|'B'); m#H_*L0  
 bfh.bfSize=54+size; T V:<TR  
 bfh.bfOffBits=54; `X8@/wf#  
 CFile bf; fRHKQ(a#  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ hh"-w3+  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); qrBZvJU  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); D}{b;Un  
  bf.WriteHuge(lpData,size); Y25uU%6t_  
  bf.Close(); J8Z0D:5  
  nCount++; D>kD1B1  
 } (tCib 4  
 GlobalFreePtr(lpData); J^zi2 jtV  
 if(nCount==1) 2{oThef[O  
  m_Number.Format("%d picture captured.",nCount); tT5pggml  
 else S; /. %  
  m_Number.Format("%d pictures captured.",nCount); CL9yEy"V  
  UpdateData(FALSE); IeTdN_8  
} jw>h k  
jk7 0u[\  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) S/gm.?$V  
{ g22gIj]  
 if(pMsg -> message == WM_KEYDOWN) Pe$6s:|NS  
 { o"q+,"QL  
  if(pMsg -> wParam == VK_ESCAPE) S`= WF^  
   return TRUE; -Kxc$}  
  if(pMsg -> wParam == VK_RETURN) qL 5>o>J  
   return TRUE; v1+U;Th>g  
 } nWaNT-  
 return CDialog::PreTranslateMessage(pMsg); gH7z  
} APSgnf  
{eHAg<+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @x{`\AM|%  
{ j43$]'-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ A lwtmDa  
  SaveBmp(); -9+se  
  return FALSE; Z4q~@|+%  
} U A-7nb  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ mTf<  
 CMenu pop; 9M-K]0S(  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); %oof}=MxCL  
 CMenu*pMenu=pop.GetSubMenu(0); f )NHM'  
 pMenu->SetDefaultItem(ID_EXITICON); K+d2m9C=  
 CPoint pt; jRj=Awy  
 GetCursorPos(&pt); Y83GKh,*  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); iHBB,x  
 if(id==ID_EXITICON) 74J@F2g}?  
  DeleteIcon(); :tj-gDa\Y  
 else if(id==ID_EXIT) SbT5u3,'  
  OnCancel(); ;Yts\4BSM  
 return FALSE; Vfs $ VY2.  
} !:0v{ZQ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ^[q /Mw  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) S~yR5cb  
 AddIcon(); RFfIF]~3  
 return res; r`M6!}oa  
} @WOM#Kc  
vq'k|_Qi=  
void CCaptureDlg::AddIcon() =/9^, 6Q(  
{ w*!wQ,o  
 NOTIFYICONDATA data; ALT^8c&K  
 data.cbSize=sizeof(NOTIFYICONDATA); nCnjq=  
 CString tip; )D@~|j:  
 tip.LoadString(IDS_ICONTIP); E^V |  
 data.hIcon=GetIcon(0); 6|;Uq'  
 data.hWnd=GetSafeHwnd(); Q!'qC*Gyfn  
 strcpy(data.szTip,tip); !a-b6Aa  
 data.uCallbackMessage=IDM_SHELL; mG2'Y)Sz  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; E4oz|2!m  
 data.uID=98; Ciihsm  
 Shell_NotifyIcon(NIM_ADD,&data); bbN%$/d  
 ShowWindow(SW_HIDE); 77,oPLSn  
 bTray=TRUE; FxW&8 9G  
} B$a-og(  
{{{#?~3$7  
void CCaptureDlg::DeleteIcon() R[Fn0fnLx  
{ 9lzQ\}  
 NOTIFYICONDATA data; q{' ~+Nq  
 data.cbSize=sizeof(NOTIFYICONDATA); z@U} ~TvP  
 data.hWnd=GetSafeHwnd(); gK1g]Tc@G  
 data.uID=98; !iu5OX7K|  
 Shell_NotifyIcon(NIM_DELETE,&data); |+f-h,  
 ShowWindow(SW_SHOW); P,z:Z| }8  
 SetForegroundWindow(); VLvS$0(}Z  
 ShowWindow(SW_SHOWNORMAL); Le#spvV3J|  
 bTray=FALSE; 1|| nR4yK  
} vF={9G  
M0'v&g  
void CCaptureDlg::OnChange() `DW2spd  
{ hv)8K'u  
 RegisterHotkey(); {})$ 99"x  
} + ,4" u  
e@]-D FG  
BOOL CCaptureDlg::RegisterHotkey() c:4P%({  
{ _eQ-`?  
 UpdateData(); HZjf`eM,  
 UCHAR mask=0; [~mGsXV  
 UCHAR key=0; zF&=U`v  
 if(m_bControl) N|Cs=-+  
  mask|=4; WlwY <)  
 if(m_bAlt) 5W? PCOh\  
  mask|=2; NC"yDWnO'  
 if(m_bShift) i!H!;z#  
  mask|=1; I -@?guZ r  
  key=Key_Table[m_Key.GetCurSel()]; !DXNo(:r  
 if(bRegistered){ +}kgQ^  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); k2^a$k}  
  bRegistered=FALSE; j;nb?;  
 } ;`j/D@H  
 cMask=mask; X@wm1{!  
 cKey=key; ig#r4nQ=  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ^Z,q$Gp~P  
 return bRegistered; l* dV\ B  
} vZAv_8S)  
O[q\e<V<  
  四、小结 VG@};dwbz*  
6[P-Ny{z  
  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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