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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: pA!-spgX  
  bB$f=W!m%  
  一、实现方法 |.)LZP,  
z|>TkCW6  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: g}W`LIasv  
8"&!3_  
#pragma data_seg("shareddata") z"4 q%DC  
HHOOK hHook =NULL; //钩子句柄 j:%,lcF  
UINT nHookCount =0; //挂接的程序数目 ~uhW~bT  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 |.@!CqJ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 vm@V5oH  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey TnQ>v{Rx  
static int KeyCount =0; =f~<*wQ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 3H,x4L5j  
#pragma data_seg()  }#m9Q[  
"}3sL#|z  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 !Q>xVlPVu  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: *J4!+GD  
L-Q8iFW'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 5qM$ahN3wH  
cKey,UCHAR cMask) MnD}i&k[  
{ $z_yx `5  
 BOOL bAdded=FALSE; >*EZZ\eU!  
 for(int index=0;index<MAX_KEY;index++){ fizW\f8ai  
  if(hCallWnd[index]==0){ Jh.~]\u  
   hCallWnd[index]=hWnd; w>B}w  
   HotKey[index]=cKey; My>q%lF=fw  
   HotKeyMask[index]=cMask; 'u.Dt*.Uq  
   bAdded=TRUE; \lg ^rfj  
   KeyCount++; Bv7FZK3  
   break; }-tJ.3Zw  
  } ]0>  
 } $T K*w8@:  
 return bAdded; N)mZ!K44  
} B=]j=\o  
//删除热键 ?jR#txR  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \HB fM&  
{ )<HvIr(xr  
 BOOL bRemoved=FALSE; 6 5zx<  
 for(int index=0;index<MAX_KEY;index++){ ,Mw93Kp Va  
  if(hCallWnd[index]==hWnd){ ] !*K|?VL  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _=0Ja S>M.  
    hCallWnd[index]=NULL; 80Y% C-Y:  
    HotKey[index]=0; lq.:/_m0  
    HotKeyMask[index]=0; z9 0JZA  
    bRemoved=TRUE; #)}BY"C%  
    KeyCount--; Do(G;D`h+_  
    break; Y[e.1\d'  
   } 3chx 4  
  }  B=*0  
 } ]0'cdC  
 return bRemoved; 2 K_ QZ  
} d_(>:|o h  
q+[ )i6!?  
<U$YJtEK  
  DLL中的钩子函数如下: :sw5@JdJ  
V_ (Ly8"1;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "tl{HM5u  
{ ~H#c-B  
 BOOL bProcessed=FALSE;  gwIR3u  
 if(HC_ACTION==nCode) e,#w* |  
 { zW\a)~ E  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 f'ld6jt|%  
   switch(wParam) :C^{Lc  
   {  ?IeBo8  
    case VK_MENU: \roJf&O }  
     MaskBits&=~ALTBIT; W0x9^'=s\  
     break; .qe+"$K'n  
    case VK_CONTROL: N1Xg-u?ul#  
     MaskBits&=~CTRLBIT; 5Kd"W,  
     break; w)J-e gc  
    case VK_SHIFT: R-$w* =Y  
     MaskBits&=~SHIFTBIT; Vc(kw7  
     break; X`<z5W] !  
    default: //judge the key and send message ~c&sr5E  
     break; uB\UIz)e  
   } tHaHBx1P  
   for(int index=0;index<MAX_KEY;index++){ tMdSdJ8  
    if(hCallWnd[index]==NULL) ({Yfsf,  
     continue; %gn@B2z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cl#XiyK>  
    { C!547(l[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); &!;o[joG  
     bProcessed=TRUE; .>,Y |  
    } !m=Js"  
   }  e4_A`j'  
  } (Of`VT3ZOA  
  else if((lParam&0xc000ffff)==1){ //有键按下  [A,!3BN  
   switch(wParam) s`Z.H5V>\  
   { 6;~V@t  
    case VK_MENU: "Cvr("'O  
     MaskBits|=ALTBIT; BGVnL}0  
     break; +5-|6  
    case VK_CONTROL: YG?4DF  
     MaskBits|=CTRLBIT; rpEIDhHv  
     break; \N0wf-qa=  
    case VK_SHIFT: N?S;v&q+  
     MaskBits|=SHIFTBIT; l`6.(6  
     break; DdISJWc'`5  
    default: //judge the key and send message xIc||o$  
     break; ?FS0zc!+  
   } c#u_%*  
   for(int index=0;index<MAX_KEY;index++){ v 9G~i  
    if(hCallWnd[index]==NULL) +F,])p4,]i  
     continue; s 7%iuP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bFG?mG:  
    { F&CvqPI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); qfAnMBM1@  
     bProcessed=TRUE; &&jQ4@m}j  
    } fhdqes])  
   } %#EzZD  
  } K5<2jl3S  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 O\oRM2^u}  
   for(int index=0;index<MAX_KEY;index++){ jL)Y'  
    if(hCallWnd[index]==NULL) 2S:B%cj9m  
     continue; C\Ob!sv%H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) N*PJ m6-  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Dbx zqd  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 8Bc2?NI=   
   } t\2-7Ohj6  
  } 7N5M=f.DS(  
 } -)&lsFF  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); } nIYNeP?D  
} DP*$@5  
BTO l`U  
  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: +wHa)A0MW  
",5=LW&,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4__HH~j?Q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .W9 *-  
Xrc{w Dn  
  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: ,DCUBD u&  
9qzHy}A  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1j}e2H  
{ $QT% -9&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) RZ9_*Lq7+  
 { XfEp_.~JM  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 gtY7N>e  
  SaveBmp();  "}[ ]R  
  return FALSE; |1<B(iB'{/  
 } g<w1d{Td  
 …… //其它处理及默认处理 V.+a}J=Cw  
} {)kL7>u]^V  
3EA_-?  
Un+-  T  
  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。 )1YGWr;ykS  
hO$29_^"  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 96gaun J  
FELW?Q?k  
  二、编程步骤 SM<qb0  
G 8tK"LC  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ,6A/| K-  
"`pg+t&  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; mndEB!b  
e&m TaCLG  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; {-|El}.M  
vMJC  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; (5RZLRn  
7i=ER*F~  
  5、 添加代码,编译运行程序。 1bCS4fs^>  
1"1ElH  
三、程序代码 '?$< k@mJW  
wA87|YK8*  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL tK\$LZ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) x ;]em9b  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ fKs3H?|  
#if _MSC_VER > 1000 grDz7\i:  
#pragma once You~ 6d6Om  
#endif // _MSC_VER > 1000 L$ju~0jl)%  
#ifndef __AFXWIN_H__ Z~"8C Kz  
#error include 'stdafx.h' before including this file for PCH w#sP5qKv8  
#endif gdqED}v  
#include "resource.h" // main symbols tkHUX!Ow;  
class CHookApp : public CWinApp <@v|~ AO4~  
{ <FvljKuq+  
 public: tqU8>d0^  
  CHookApp(); ZB,UQ~!Yr  
  // Overrides m&Y?]nbq  
  // ClassWizard generated virtual function overrides 9lX+?m~ ~  
  //{{AFX_VIRTUAL(CHookApp) ,0n=*o@W  
 public: cdfnM%`>\  
  virtual BOOL InitInstance(); ^Ov+n1,)  
  virtual int ExitInstance(); 2u} ns8wn  
  //}}AFX_VIRTUAL .zdmUS :  
  //{{AFX_MSG(CHookApp) d 4;   
  // NOTE - the ClassWizard will add and remove member functions here. S ^@# %>  
  // DO NOT EDIT what you see in these blocks of generated code ! /<IXCM.  
  //}}AFX_MSG ">R`S<W  
  DECLARE_MESSAGE_MAP() rGSi !q  
}; /oU$TaB>(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); StMvz~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); V8z*mnD  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); V}t8H  
BOOL InitHotkey(); I,?!NzB  
BOOL UnInit(); atfK?VK#  
#endif bg,VK1  
G#z9=NF~V  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. k%({< ul  
#include "stdafx.h" .J9\Fr@  
#include "hook.h" ch0x*[N@  
#include <windowsx.h> ZF;s`K)  
#ifdef _DEBUG a~`,zQ -@  
#define new DEBUG_NEW s Qa9M  
#undef THIS_FILE lJBZ0  
static char THIS_FILE[] = __FILE__; 7e<\11uI]a  
#endif Y/34~lhyl  
#define MAX_KEY 100 >tV:QP]Y  
#define CTRLBIT 0x04 J y0TVjA  
#define ALTBIT 0x02 N+ei)-  
#define SHIFTBIT 0x01 v|YJ2q?19  
#pragma data_seg("shareddata") yI*h"?7T  
HHOOK hHook =NULL; {:BY IdX  
UINT nHookCount =0; ~=pyA#VVJ"  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Fk&A2C}$b  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT I6F $@  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey e#{l  
static int KeyCount =0; Z`bo1,6>  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift BjbpRQ,  
#pragma data_seg() M% FKg/  
HINSTANCE hins;   [IW6F  
void VerifyWindow(); ("j*!Dsd  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ?nx 1{2[  
//{{AFX_MSG_MAP(CHookApp) \b|Q`)TK  
// NOTE - the ClassWizard will add and remove mapping macros here. fm^)u"  
// DO NOT EDIT what you see in these blocks of generated code! jh.e&6  
//}}AFX_MSG_MAP WevXQ-eKm  
END_MESSAGE_MAP() q e;O Ox  
e!*%U= [Q  
CHookApp::CHookApp() >CPoeIHK  
{ W/I D8+:i  
 // TODO: add construction code here, ,V:RE y  
 // Place all significant initialization in InitInstance ;Ajy54}7  
} G,b1u"  
DM@&=c  
CHookApp theApp; b'~IFNt*^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) wPU<jAQyp  
{ r<L>~S>yb  
 BOOL bProcessed=FALSE; H) &pay  
 if(HC_ACTION==nCode) HFd>UdT%  
 { =D~RIt/D  
  if((lParam&0xc0000000)==0xc0000000){// Key up 1f`=U 0  
   switch(wParam) {^n\ r^5  
   { k@= LR  
    case VK_MENU: :,(ZMx\  
     MaskBits&=~ALTBIT; L]HYk}oD.  
     break; spt='!)4  
    case VK_CONTROL: H/6GD,0  
     MaskBits&=~CTRLBIT; O6pL )6d  
     break; IW'2+EGc  
    case VK_SHIFT: iy_\1jB0  
     MaskBits&=~SHIFTBIT; i\?P>:)  
     break; \LS+.bp%  
    default: //judge the key and send message NCM&6<_  
     break; #D{//P|;  
   } y 3O Nn~k  
   for(int index=0;index<MAX_KEY;index++){ /M "E5  
    if(hCallWnd[index]==NULL) K9y!ZoB  
     continue; W}5H'D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?geEq'  
    { J12 ZdC'O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5Y&s+|   
     bProcessed=TRUE; k(;c<Z{?1  
    } k&1~yW  
   } E*Q><UU  
  } NX(.Lw}  
  else if((lParam&0xc000ffff)==1){ //Key down k+S 6)BQ7U  
   switch(wParam) F W# S.<  
   { i%~4>k  
    case VK_MENU: _;B N;].  
     MaskBits|=ALTBIT; }hFjl4`xa  
     break; .#;;pu7W  
    case VK_CONTROL: 7n~BDqT  
     MaskBits|=CTRLBIT; [N/[7Q/y  
     break; uj-q@IKe  
    case VK_SHIFT: S{NfU/: dL  
     MaskBits|=SHIFTBIT; %L./U$  
     break; %XqLyeOS  
    default: //judge the key and send message (r^IW{IndX  
     break; &0 VM <  
   } <&o `T4  
   for(int index=0;index<MAX_KEY;index++) `C`_2y8  
   { iw(\]tMt  
    if(hCallWnd[index]==NULL) eP3)8QC  
     continue; zy#E qv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )^^r\  
    { A]{8 =  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); V&_5q`L  
     bProcessed=TRUE; nYuZg6K  
    } 0rT-8iJp4P  
   } w>X33Ff]8@  
  } F,e_`  
  if(!bProcessed){ XQk9 U  
   for(int index=0;index<MAX_KEY;index++){ 7;n'4LIa9  
    if(hCallWnd[index]==NULL) SF;;4og  
     continue; r! 5C3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) cJm!3X  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ];1z%.  
   } B{|P}fN5}  
  } &K`[SX=  
 } j*$GP'Df3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); A{;b^ IK  
} q01zN:|-1  
_qmB PUx  
BOOL InitHotkey() $+ZO{ (  
{ jo<[|ZD  
 if(hHook!=NULL){ C did*hxJ  
  nHookCount++; K I$?0O  
  return TRUE; U;6~]0^K  
 } T_,LK7D  
 else cCU'~  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); eF}Q8]da  
  if(hHook!=NULL) 788q<7E  
   nHookCount++; z0HCmj9T  
  return (hHook!=NULL); NeHR% a2~  
} ^C):yxN P  
BOOL UnInit() +&a2aEXF  
{ _e8@y{/~Fd  
 if(nHookCount>1){ PKfxL}:"8  
  nHookCount--; pLBp[GQ  
  return TRUE; bR*T}w$<  
 } 3VA8K@QiRm  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ;myu8B7&  
 if(unhooked==TRUE){ 0wZLkU_(  
  nHookCount=0; #JO#PV%  
  hHook=NULL; +tkd($//  
 } ERGDo=j  
 return unhooked; F^T7u?^)  
} zG@9-s* L  
w>H!H6Q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) p4Vw`i+DnH  
{ ;b cy(Fp,\  
 BOOL bAdded=FALSE; ui G7  
 for(int index=0;index<MAX_KEY;index++){ yKOf]m>#  
  if(hCallWnd[index]==0){ m]N 4.J  
   hCallWnd[index]=hWnd; z=>]E 1'RL  
   HotKey[index]=cKey; WU#bA|Cf  
   HotKeyMask[index]=cMask; )/bt/,M&}  
   bAdded=TRUE; }[D~#Z!k  
   KeyCount++; I g-VSQ  
   break; <LZvG IMl  
  } Q`AJR$L  
 } z~o%U&DO}  
 return bAdded; ;c:vz F~Q  
} \RMYaI^+;  
k@4]s_2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) N<Y-]xS  
{ \)y5~te*  
 BOOL bRemoved=FALSE; w|?Nq?KA  
 for(int index=0;index<MAX_KEY;index++){ >4~{ CXZ  
  if(hCallWnd[index]==hWnd){ 0\o0(eHCQz  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {x2N~1!E  
    hCallWnd[index]=NULL; $Xz9xzOR  
    HotKey[index]=0; a4g=cs<9}  
    HotKeyMask[index]=0; 3iH!;`i  
    bRemoved=TRUE; ,589/xTA@  
    KeyCount--; H -.3r  
    break; 6prN,*k5  
   } rCYNdfdpp  
  } vhWj_\m  
 } qUpMq:Uw  
 return bRemoved; quGb;)3  
} wg!  
#ye++.7WK  
void VerifyWindow() z<^HohT  
{ Am  kHVg  
 for(int i=0;i<MAX_KEY;i++){ CmJ*oXyi  
  if(hCallWnd!=NULL){ /=m=i%& #  
   if(!IsWindow(hCallWnd)){ aWe H,A%  
    hCallWnd=NULL; m&2< ?a}l  
    HotKey=0; QdC>fy  
    HotKeyMask=0; X5>p~;[9  
    KeyCount--; pN*>A^  
   } [2)Y0; ["  
  } 5f}63as  
 } rf)\:75  
} oh& P Q{  
S'6(&"XC H  
BOOL CHookApp::InitInstance() !R)v2Mk|  
{ o5Pq>Y2T  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); HpNf f0c  
 hins=AfxGetInstanceHandle(); 3ufUB^@4v  
 InitHotkey(); M5 Pvc  
 return CWinApp::InitInstance(); *(o~pxFTR  
} Qs;bVlp!H  
!n)2HDYhx,  
int CHookApp::ExitInstance() zJdlHa{  
{ oWx! 'K6]V  
 VerifyWindow(); @xO< ~  
 UnInit(); h7*fjw-Xz[  
 return CWinApp::ExitInstance(); ]<z>YyBA  
} /A <L  
EVRg/ {X  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 7z F29gC  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) q\mVZyj  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 1{nXmtvr  
#if _MSC_VER > 1000  eCk}B$ 2  
#pragma once rC/m}`b  
#endif // _MSC_VER > 1000 wm8(Ju  
&IOChQ`8P  
class CCaptureDlg : public CDialog _?O'65  
{ ivw2EEo,  
 // Construction hua{g_  
 public: $]xe,}*Af  
  BOOL bTray; d;;]+%  
  BOOL bRegistered; =$Xdn'  
  BOOL RegisterHotkey(); cq@8!Eu w]  
  UCHAR cKey; x*bM C&Ea  
  UCHAR cMask; ha3 Qx  
  void DeleteIcon(); p0'A\@|  
  void AddIcon(); !cp ,OrO\  
  UINT nCount; JBi<TDm/  
  void SaveBmp(); ~G5)ya-  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ,Iwri\  
  // Dialog Data *4]I#N  
  //{{AFX_DATA(CCaptureDlg) >9Ub=tZm  
  enum { IDD = IDD_CAPTURE_DIALOG }; e)7[weGN  
  CComboBox m_Key; /e#_Yg  
  BOOL m_bControl; ']A+wGR&r  
  BOOL m_bAlt; !t~S.`vF  
  BOOL m_bShift; 3D;\V&([  
  CString m_Path; xJN JvA  
  CString m_Number; Q[`_Y3@j  
  //}}AFX_DATA RK"dPr  
  // ClassWizard generated virtual function overrides I)Lg=n$  
  //{{AFX_VIRTUAL(CCaptureDlg) :6N{~[:4  
 public: fLct!H3  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ryN/sjQC  
 protected: u|O5ZV-cd  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support J3y5R1?EP  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); FU5vo  
  //}}AFX_VIRTUAL VX2bC(E'%  
  // Implementation U#d&#",s  
 protected: 9IC"p<D  
  HICON m_hIcon; T3%yV*F,  
  // Generated message map functions ~*THL0]~  
  //{{AFX_MSG(CCaptureDlg) |W`1#sP>  
  virtual BOOL OnInitDialog(); 2O`uzT$  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 1MX:^L!f8  
  afx_msg void OnPaint(); ^nFa'=  
  afx_msg HCURSOR OnQueryDragIcon(); n=L;(jp<j  
  virtual void OnCancel(); uTBls8  
  afx_msg void OnAbout(); o @~XX@5l  
  afx_msg void OnBrowse(); WTSY:kvcCY  
  afx_msg void OnChange(); K?(ls$  
 //}}AFX_MSG j#3}nJB%#i  
 DECLARE_MESSAGE_MAP() 9I+;waLlB  
}; <;SQ1^N  
#endif DZRk K3  
9\R:J"X  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file W>bhSKV%  
#include "stdafx.h" X./8 PK?&  
#include "Capture.h" 9 qqy(H  
#include "CaptureDlg.h" Xe:B*  
#include <windowsx.h> LN" bGe  
#pragma comment(lib,"hook.lib") S2;{)"mS  
#ifdef _DEBUG fw|r{#d  
#define new DEBUG_NEW K>w}(td  
#undef THIS_FILE \02j~r`o  
static char THIS_FILE[] = __FILE__; ()}O|JL:K  
#endif =@G#c5H*  
#define IDM_SHELL WM_USER+1 fn&gM\<-+(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); NnGQ=$e  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {KdC5 1"Nv  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; hy3[MOD$G  
class CAboutDlg : public CDialog ! |}J{  
{ I8 8y9sW  
 public: 0{gvd"q  
  CAboutDlg(); S%kE<M?  
  // Dialog Data $_@~t$  
  //{{AFX_DATA(CAboutDlg) A WMR0I  
  enum { IDD = IDD_ABOUTBOX }; WFjNS'WI_  
  //}}AFX_DATA G0^23j  
  // ClassWizard generated virtual function overrides Op~sR^ez  
  //{{AFX_VIRTUAL(CAboutDlg) 9K Ih}Q@P  
 protected: NA]7qb%%<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 42Tjbten_u  
  //}}AFX_VIRTUAL &!N5}N&  
  // Implementation Zo-E0[9  
 protected: i>7f9D7  
  //{{AFX_MSG(CAboutDlg) %+Z 0 $Q  
  //}}AFX_MSG w4:n(.;HK  
  DECLARE_MESSAGE_MAP() 9hmCvQgtf  
}; `[jQn;  
G|4vnIS  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 0{BPT>'  
{ )>\J~{  
 //{{AFX_DATA_INIT(CAboutDlg) &oWWc$  
 //}}AFX_DATA_INIT 6@]Xwq  
} f"k?Ix\ e  
c1jHg2xim  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ed'}ReLK  
{ ^;6~=@#*C  
 CDialog::DoDataExchange(pDX); v|?hc'Fj  
 //{{AFX_DATA_MAP(CAboutDlg) #E{aN?_  
 //}}AFX_DATA_MAP _>dqz(8#  
} _ZzN}!Mye  
::j'+_9  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) xv$^%(Ujp  
 //{{AFX_MSG_MAP(CAboutDlg) Wey-nsk  
 // No message handlers E&{*{u4  
 //}}AFX_MSG_MAP 0k:&7(j  
END_MESSAGE_MAP() }<2F]UuR  
?uU0NKZA  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) _xl#1>G^J  
: CDialog(CCaptureDlg::IDD, pParent) Rb#Z'1D'G  
{ hX`WVVoF  
 //{{AFX_DATA_INIT(CCaptureDlg) CV]PCq!  
  m_bControl = FALSE; J}._v\Q7P  
  m_bAlt = FALSE; TbIM{X  
  m_bShift = FALSE; 3a!/EP  
  m_Path = _T("c:\\"); 66p_d'U  
  m_Number = _T("0 picture captured."); R:E6E@T  
  nCount=0; 2}$Vi$ R  
  bRegistered=FALSE; sx*1D9s_  
  bTray=FALSE; l>~:lBO  
 //}}AFX_DATA_INIT k{c~  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 0a8nBo7A-X  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); {@Diig  
} 4 3]6J]!)  
e!tgWYN  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) GVn9=[r  
{ 1yX&iO^d  
 CDialog::DoDataExchange(pDX); Vq9hAD|k  
 //{{AFX_DATA_MAP(CCaptureDlg) ?z:xQ*#X  
  DDX_Control(pDX, IDC_KEY, m_Key); Zr}`W \  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); (g7nMrE$j  
  DDX_Check(pDX, IDC_ALT, m_bAlt); }s}9@kl;&  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); MYN1zYT6j  
  DDX_Text(pDX, IDC_PATH, m_Path); h@{@OAu?  
  DDX_Text(pDX, IDC_NUMBER, m_Number); wTIf#y1=9  
 //}}AFX_DATA_MAP zE<vFP-1v  
} yA%[ u.{  
U}gYZi;;$  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ZN1QTb  
//{{AFX_MSG_MAP(CCaptureDlg) ,P auP~L  
 ON_WM_SYSCOMMAND() A8Jbl^7E+  
 ON_WM_PAINT() 3g-}k  
 ON_WM_QUERYDRAGICON() ARQ1H0_B  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) n0vPW^EQ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 5.GBd_;  
 ON_BN_CLICKED(ID_CHANGE, OnChange) g^0  
//}}AFX_MSG_MAP ;P2~cQjD;  
END_MESSAGE_MAP() f^$\+H"W  
3J(STIxg  
BOOL CCaptureDlg::OnInitDialog() ][?GJ"O+U  
{ @F3d9t-  
 CDialog::OnInitDialog(); )$th${pd#v  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 57[O)5u.+  
 ASSERT(IDM_ABOUTBOX < 0xF000); OcSLRN?t  
 CMenu* pSysMenu = GetSystemMenu(FALSE); \H" (*["&  
 if (pSysMenu != NULL) UI!EIZ*~  
 { Mm/GI a  
  CString strAboutMenu; ||!k 3t#<  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ait/|a  
  if (!strAboutMenu.IsEmpty()) GbL,k? ey  
  { 0;XnNz3&  
   pSysMenu->AppendMenu(MF_SEPARATOR); <?Lj!JGX  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); x1Si&0T0P<  
  } F[?t"d  
 } nZ%<2  
 SetIcon(m_hIcon, TRUE); // Set big icon P, >#  
 SetIcon(m_hIcon, FALSE); // Set small icon oa9T3gQ?  
 m_Key.SetCurSel(0); q g%<>B&"  
 RegisterHotkey(); Zmp ^!|=X!  
 CMenu* pMenu=GetSystemMenu(FALSE); RKBtwZx>f  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); #MBYa&Tw7  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); BRW   
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _C*}14 "3  
 return TRUE; // return TRUE unless you set the focus to a control 7M$>'PfO  
} `Zk?.1*2/  
Ybok[5  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) zCco/]h  
{ O^IpfS\/  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) =XWi+')  
 { bF}~9WEa  
  CAboutDlg dlgAbout; #cmj?y()  
  dlgAbout.DoModal(); h\20  
 } )P,jpE8  
 else cy}2~w&s4  
 { ,m:MI/ )p  
  CDialog::OnSysCommand(nID, lParam); icnp^2P  
 } Uh9$e  
} V= .'Db2D  
7d9%L}+q  
void CCaptureDlg::OnPaint() nNL9B~d  
{ ikofJl]9  
 if (IsIconic()) !J+5l&  
 { ci*Z9&eS+  
  CPaintDC dc(this); // device context for painting ,I)/ V>u  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); HZM&QZHx)`  
  // Center icon in client rectangle 0_%u(?  
  int cxIcon = GetSystemMetrics(SM_CXICON); G8<,\mg+  
  int cyIcon = GetSystemMetrics(SM_CYICON); WAob"`8]  
  CRect rect; Rr:,'cXGi  
  GetClientRect(&rect); QRa>W/N  
  int x = (rect.Width() - cxIcon + 1) / 2; 4wK!)Pwq  
  int y = (rect.Height() - cyIcon + 1) / 2; A3h[VnuG,  
  // Draw the icon #Ok*O r  
  dc.DrawIcon(x, y, m_hIcon); 0A|.ch  
 } \]o#tYN\a0  
 else ~I!7]i]"*?  
 { !v94FkS>  
  CDialog::OnPaint(); RELLQpz3  
 } sH#UM(N  
} +Pn+&o;D  
EAx@a%  
HCURSOR CCaptureDlg::OnQueryDragIcon() qM]eK\q 1  
{ /Wk\ 6  
 return (HCURSOR) m_hIcon; 4WDh8U  
} 3C2L _ K3  
`2U zJ~  
void CCaptureDlg::OnCancel() @e+QGd;}  
{ NtSa# $A  
 if(bTray) - x@mS2  
  DeleteIcon(); vJ }^ p }  
  CDialog::OnCancel(); =A04E  
} 0I& !a$:  
oJ>]=^?k  
void CCaptureDlg::OnAbout() ZB<goEg  
{ dz&8$(f,  
 CAboutDlg dlg; CR&v z3\Q  
 dlg.DoModal(); vG69z&  
} s9@/(_  
Hq3"OMGq  
void CCaptureDlg::OnBrowse() $9j\sZj&  
{ OT&J OTk\  
 CString str; DHd9yP9-  
 BROWSEINFO bi; -: dUD1  
 char name[MAX_PATH]; O4S~JE3o  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 6 `+dP"@  
 bi.hwndOwner=GetSafeHwnd(); I_oJx  
 bi.pszDisplayName=name; YJ3aJ^m#E  
 bi.lpszTitle="Select folder"; {+F/lN@  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; MOKg[ j  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); xlZ"F  
 if(idl==NULL) !X[b 4p  
  return; d<r=f"  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); [I^>ji0V  
 str.ReleaseBuffer(); l\I#^N  
 m_Path=str; *Fi`o_d9[`  
 if(str.GetAt(str.GetLength()-1)!='\\') @`^+XPK\  
  m_Path+="\\"; J\^ZRu_K  
 UpdateData(FALSE); AKk6kI8F  
} BT.;l I  
_~ZNX+4  
void CCaptureDlg::SaveBmp() ,u8)g; 8s  
{ B"rnSui  
 CDC dc; D~E1hr&Vd>  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); $hZb<Xz  
 CBitmap bm; DN3#W w2[r  
 int Width=GetSystemMetrics(SM_CXSCREEN); qpjtF'  
 int Height=GetSystemMetrics(SM_CYSCREEN); l=,\ h&  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 9JYrP6I!_  
 CDC tdc; 0*^ J;QGE  
 tdc.CreateCompatibleDC(&dc); B8 ;jRY  
 CBitmap*pOld=tdc.SelectObject(&bm); V3DXoRE-8i  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); KJ M :-z@  
 tdc.SelectObject(pOld); Dvbrpn!sk  
 BITMAP btm; yr?*{;  
 bm.GetBitmap(&btm); `@1y|j:m  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; G- wQ weJ9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); D;VQoO  
 BITMAPINFOHEADER bih; +y'V  
 bih.biBitCount=btm.bmBitsPixel; zO8`xrN!  
 bih.biClrImportant=0; })RT2zw}  
 bih.biClrUsed=0; |W4 \  
 bih.biCompression=0; ` ]%\Y>(a}  
 bih.biHeight=btm.bmHeight; 2NHuZ.af  
 bih.biPlanes=1; Ja<pvb  
 bih.biSize=sizeof(BITMAPINFOHEADER); e&%m[:W:<  
 bih.biSizeImage=size; o>*vG  
 bih.biWidth=btm.bmWidth; =.NZ {G  
 bih.biXPelsPerMeter=0; 9DcUx-   
 bih.biYPelsPerMeter=0; jyQ Bx  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); wgfy; #  
 static int filecount=0; x}Qet4vV  
 CString name; &* GwA  
 name.Format("pict%04d.bmp",filecount++); uis;S)+  
 name=m_Path+name; Y*nzOD$  
 BITMAPFILEHEADER bfh; EXn$ [K;  
 bfh.bfReserved1=bfh.bfReserved2=0; (}E-+:vFU  
 bfh.bfType=((WORD)('M'<< 8)|'B'); %~%1Is`4J  
 bfh.bfSize=54+size; AdBF$nn[  
 bfh.bfOffBits=54; L$zI_ z  
 CFile bf; 18JhC*in  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ;4. D%  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); St/<\Y,wr  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ~@ a7RiE@  
  bf.WriteHuge(lpData,size); XgY( Vv  
  bf.Close(); iw1((&^)"  
  nCount++; pcw!e_"+  
 } JHpoW}7QB  
 GlobalFreePtr(lpData); z{T2! w~[  
 if(nCount==1) J]uYXsC  
  m_Number.Format("%d picture captured.",nCount); "o#N6Qu71  
 else W}B 4^l  
  m_Number.Format("%d pictures captured.",nCount); E.W7`zl  
  UpdateData(FALSE); 3$f%{~3  
} 7O5`&Z'-  
8>q:Q<BB2  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) .N~qpynY  
{ i[FcY2  
 if(pMsg -> message == WM_KEYDOWN) X;_0"g  
 { y@g{:/cmO  
  if(pMsg -> wParam == VK_ESCAPE) q|m8G  
   return TRUE; Gjuc"JR7  
  if(pMsg -> wParam == VK_RETURN) rC]jz$sle  
   return TRUE; 20gPx;  
 }  01I5,Dm  
 return CDialog::PreTranslateMessage(pMsg); gOw|s1`2,  
} X70vDoW  
: 4$Ex2  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) &|<~J (L;  
{ fX G+88:2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ,u QLXF2  
  SaveBmp(); tF)K$!GR[  
  return FALSE; #FF5xe  
} s<0yQ-=.?N  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [ANit0-~  
 CMenu pop; Y>!9P\Xe  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); g=; rM8W  
 CMenu*pMenu=pop.GetSubMenu(0); MnFem $ @  
 pMenu->SetDefaultItem(ID_EXITICON); 9\TvX!)h  
 CPoint pt; `g% ]z@'+?  
 GetCursorPos(&pt); xt +fu L  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); pPCxa#OV  
 if(id==ID_EXITICON) #Q6wv/"Ub  
  DeleteIcon(); Rz`<E97-  
 else if(id==ID_EXIT) #l~ d  
  OnCancel(); [$3Zid  
 return FALSE; {d(PH7R  
} 9In&vF7$  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); [.<nt:  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8s8q`_.)(  
 AddIcon(); 4M(w<f\5F  
 return res; a[s%2>e  
} ,Z_nV+l_  
i#lvt#2J0  
void CCaptureDlg::AddIcon() y=9a2 [3Dz  
{ doc5;?6   
 NOTIFYICONDATA data; ^'QcP5Fv  
 data.cbSize=sizeof(NOTIFYICONDATA); T'XAcH  
 CString tip; _'n;rZ+  
 tip.LoadString(IDS_ICONTIP); aC3\Hs  
 data.hIcon=GetIcon(0); \+GXUnkj  
 data.hWnd=GetSafeHwnd(); 4)2*|w  
 strcpy(data.szTip,tip); PyYKeo=  
 data.uCallbackMessage=IDM_SHELL; 1sc #!^Oo  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; nS?HH6H  
 data.uID=98; a-!"m  
 Shell_NotifyIcon(NIM_ADD,&data); &[cL%pP  
 ShowWindow(SW_HIDE); JPQ02&e  
 bTray=TRUE; \<lV),  
} Q k-y 0  
f+xGf6V  
void CCaptureDlg::DeleteIcon() *B:{g>0  
{ I4|p;\`fK  
 NOTIFYICONDATA data; fbuop&FN+q  
 data.cbSize=sizeof(NOTIFYICONDATA); ,eUMSg~P.7  
 data.hWnd=GetSafeHwnd(); A9l^S|r  
 data.uID=98; &KR@2~vE  
 Shell_NotifyIcon(NIM_DELETE,&data); )STt3.  
 ShowWindow(SW_SHOW); iT^lk'?{O  
 SetForegroundWindow(); DvOg|XUU0  
 ShowWindow(SW_SHOWNORMAL); *y(2BrL>  
 bTray=FALSE; ^;@Bz~Z  
} k}T~N.0  
ui 2RTAb  
void CCaptureDlg::OnChange() KMbBow3o*~  
{ -IX;r1UD  
 RegisterHotkey(); A5H[g`&  
} ,+'f unH  
Q^39Wk@  
BOOL CCaptureDlg::RegisterHotkey() qA30z%#z_  
{ R*yB);p  
 UpdateData();  &R^mpV5  
 UCHAR mask=0; b/5~VY*T  
 UCHAR key=0; J7cqnj  
 if(m_bControl) H`io|~Q  
  mask|=4; MPL2#YU/a  
 if(m_bAlt) 5~[ Fh2+  
  mask|=2; 'M'LJ.,"/  
 if(m_bShift) R>0ta  Q  
  mask|=1; n--`zx-['  
  key=Key_Table[m_Key.GetCurSel()]; 5cE[s<=  
 if(bRegistered){ ]B7t9l  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); d,0pNav)  
  bRegistered=FALSE; >=Rb:#UM  
 } 5 + Jy  
 cMask=mask; x)Th2es\  
 cKey=key; zYs? w=  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Sqge5v  
 return bRegistered; bFJn-g n  
} ,}|V'y  
>qgBu_  
  四、小结 d z\b]H]  
-OW$  
  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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