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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: T'8RkDI}-  
  l<TIG3 bs  
  一、实现方法 Qu`n&  
=HMmrmz:  
  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: ,*dzJT$k  
Kh)F yV  
#pragma data_seg("shareddata") k5a\Sq}  
HHOOK hHook =NULL; //钩子句柄 }&1Iyb  
UINT nHookCount =0; //挂接的程序数目 [G a~%m  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 $_)=8"Sn  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 p'&*r2_ram  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey MD<-w|#8IV  
static int KeyCount =0; k^^:;OR  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 W}h|K:-S  
#pragma data_seg() !h>D;k6 e  
NY@"&p'Q  
  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。 "x&3Z@q7  
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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: rs:Q%V ^  
IZ8y}2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR RlsVC_H\  
cKey,UCHAR cMask) XrS\+y3  
{ cn%2OP:L^  
 BOOL bAdded=FALSE; (S oo<.9~  
 for(int index=0;index<MAX_KEY;index++){ c&f y{}10  
  if(hCallWnd[index]==0){ 1TjZ#yP%1  
   hCallWnd[index]=hWnd; aX^+ O,  
   HotKey[index]=cKey; f7J,&<<5w  
   HotKeyMask[index]=cMask; 8Mu;U3cIW  
   bAdded=TRUE; ,)h)5o(?  
   KeyCount++; #dc1pfL!y{  
   break; tWY2o3j  
  } $b>}C= gt  
 } LmQ/#Gx  
 return bAdded; =XT)J6z^"  
} WA.AFt  
//删除热键 gi]ZG  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q> 8pP\ho  
{ Rg* J}  
 BOOL bRemoved=FALSE; Km3&N  
 for(int index=0;index<MAX_KEY;index++){ S &JJIFftO  
  if(hCallWnd[index]==hWnd){ K=6UK%y A  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ s&'BM~WI  
    hCallWnd[index]=NULL; (ZP87Gz  
    HotKey[index]=0; mJC3@V s  
    HotKeyMask[index]=0; g:<?  
    bRemoved=TRUE; jxw_*^w"  
    KeyCount--; `qiQ$kz  
    break; d TGA5c  
   } 47UO*oLS  
  } B9X8  
 } Y ?'tUV  
 return bRemoved; /N)5 3!LT  
} ],lV}Mlg*  
tNnyue{p  
5PZN^\^  
  DLL中的钩子函数如下: b |7ja_  
[s` G^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) zgKY4R{V  
{ R$m`Z+/@  
 BOOL bProcessed=FALSE; B@t'U=@7  
 if(HC_ACTION==nCode) SwH2$:f  
 { :0 ^s0l  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Veji^-0E  
   switch(wParam) } /e`v6  
   {  pOga6'aB)  
    case VK_MENU: c ~F dx  
     MaskBits&=~ALTBIT; f h<*8w0H  
     break; bJ3(ckhq  
    case VK_CONTROL: ~ 3T,&?r  
     MaskBits&=~CTRLBIT; bAF )Bli  
     break; eThy+  
    case VK_SHIFT: S KXD^OH  
     MaskBits&=~SHIFTBIT; Hl7:*]l7b  
     break; AQ{zx1^2>K  
    default: //judge the key and send message >V;,#5F_  
     break; \#dl6:"  
   } Z=+03  
   for(int index=0;index<MAX_KEY;index++){ p-$Cs _{Z  
    if(hCallWnd[index]==NULL) Bw< rp-  
     continue; K7`YJp`i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |M5-5)  
    { 1n%8j*bJq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;-@=  
     bProcessed=TRUE; @q8an  
    } >nn Y:7m  
   } or?%-)  
  } ;Zut@z4\  
  else if((lParam&0xc000ffff)==1){ //有键按下 OXhAha`R  
   switch(wParam) >3D7tK(  
   { G<qIY&D'  
    case VK_MENU: (f1M'w/OD  
     MaskBits|=ALTBIT; py<_HyJ  
     break; 9 $l>\.6  
    case VK_CONTROL: F $yO  
     MaskBits|=CTRLBIT; CjL<RJR=  
     break; NHaMo*xQ  
    case VK_SHIFT: >Da~Q WW|  
     MaskBits|=SHIFTBIT; K|^wc$  
     break; XZph%j0o  
    default: //judge the key and send message FY#!N L  
     break; H;KDZO9W  
   } HW_& !ye  
   for(int index=0;index<MAX_KEY;index++){ mLwY]2T"  
    if(hCallWnd[index]==NULL) R p.W,)i  
     continue; KL3<Iz]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1B:aC|B  
    { L-h$Z0]_F  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); --k:a$Nt  
     bProcessed=TRUE; 1'KishHK=  
    } e<=;i" |  
   } 3<(q }  
  } *^XbDg9  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 @h?crJ6$  
   for(int index=0;index<MAX_KEY;index++){ -l*g~7|j  
    if(hCallWnd[index]==NULL) Ex(3D[WmMW  
     continue; e>H:/24  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \7 a4uc  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Plo,XU  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 s: |M].  
   } G*n2Ii  
  } mh` |=M]8E  
 } 9%DT0.D}$j  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); j F5Blc  
} lpC @I^:  
8k!6b\Imz  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Wd 2sh  
Fvl`2W94;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Dz&+PES_k  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3'eG ;<F  
X"*^l_9-v  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: _" N\b%CkO  
#@//7Bf%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) v,1F-- v  
{ *Xr$/N  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) (4+1lOd  
 { Dn;p4T@  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 S*t%RZ~a  
  SaveBmp(); /L~m#HxWU  
  return FALSE; ,0?!ov|  
 } :7b-$fm  
 …… //其它处理及默认处理 P]6}\ ]~  
} AtHS@p  
Z85|I.mr  
SI-X[xf  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 e3(<8]`b[  
U}AX0*S  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 NPJ.+ph  
%xlpB75N4N  
  二、编程步骤 ?0vNEz[  
!: us!s  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ?[= U%sPu=  
Fdt}..H%  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; z hsx &  
Mq\~`8V  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; e!0OW7 kV  
:pZ}*?\  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; }Ik1bkK  
A,XfD}+:Z  
  5、 添加代码,编译运行程序。 U{#xW  
Z)9R9s  
三、程序代码 JP=ZUu  
KH<v@IJ\  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL I:;+n^N?  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) `,#!C`E 9  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ZBM!MSf:  
#if _MSC_VER > 1000 Tov&68A~e  
#pragma once w|Qd`  
#endif // _MSC_VER > 1000 T.Zz;2I  
#ifndef __AFXWIN_H__ dWpk='  
#error include 'stdafx.h' before including this file for PCH 8pe0$r`b  
#endif Bc ^4 T1  
#include "resource.h" // main symbols #PAU'u 3{/  
class CHookApp : public CWinApp =vEkMJ Os  
{ 0m=(W^c  
 public: u0]q`u/ T  
  CHookApp(); 5gK~('9'?1  
  // Overrides !J^tg2M8:  
  // ClassWizard generated virtual function overrides kL;t8{n  
  //{{AFX_VIRTUAL(CHookApp) 14l; *  
 public: pxplWP,  
  virtual BOOL InitInstance(); YFvgz.>QE  
  virtual int ExitInstance(); UR:n5V4  
  //}}AFX_VIRTUAL W_JhNe  
  //{{AFX_MSG(CHookApp) 9d\N[[Vu]R  
  // NOTE - the ClassWizard will add and remove member functions here. ,nYZxYLf+  
  // DO NOT EDIT what you see in these blocks of generated code ! e_.~n<=  
  //}}AFX_MSG a4by^   
  DECLARE_MESSAGE_MAP() <}2A=~ _  
}; shK&2Noan  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); v" FO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); wE2x:Ge:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [V5-%w^  
BOOL InitHotkey(); 065A?KyD  
BOOL UnInit(); 2np-Fc{S  
#endif eT\p-4b  
hht+bpHl  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. S7#0*2#[o  
#include "stdafx.h" Xz* tbW#  
#include "hook.h" Ar5JP_M`E  
#include <windowsx.h> %kW3hQ<$  
#ifdef _DEBUG T&*eOr  
#define new DEBUG_NEW R `Q?J[e  
#undef THIS_FILE G5+]DogS  
static char THIS_FILE[] = __FILE__; /Mx CvEE  
#endif y`+<X{V5L  
#define MAX_KEY 100 Is kSX  
#define CTRLBIT 0x04 =U_ @zDD@V  
#define ALTBIT 0x02 -faw:  
#define SHIFTBIT 0x01 ] - h|]  
#pragma data_seg("shareddata") 4ioN A/E  
HHOOK hHook =NULL; #VR`?n?,  
UINT nHookCount =0; _<Vg[ -:1  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey qL~Pjr>cF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT o HRbAE^  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey >rRjm+vg  
static int KeyCount =0; JrxP,[qJG  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift y|LXDq4Wj  
#pragma data_seg() 6(sfpK'  
HINSTANCE hins; ^EUQ449<p  
void VerifyWindow(); [$H( CH`  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) {{GHzW  
//{{AFX_MSG_MAP(CHookApp) z22N7W=7  
// NOTE - the ClassWizard will add and remove mapping macros here. -KA4Inn]5  
// DO NOT EDIT what you see in these blocks of generated code! 2nYiG)tg  
//}}AFX_MSG_MAP N~0$x,bR  
END_MESSAGE_MAP() &U8 54  
m(h/:JZ\  
CHookApp::CHookApp() k0=|10bi  
{ 1=- X<M75  
 // TODO: add construction code here, iiQ||P}5  
 // Place all significant initialization in InitInstance n *Q4G}p  
} Mof)2Hbd:  
Q0_M-^~WT  
CHookApp theApp; <"{+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) '1qAZkz  
{ #SK#k<&P  
 BOOL bProcessed=FALSE; IcO9V<Q|  
 if(HC_ACTION==nCode) JO]`LF]  
 { *%z<P~}  
  if((lParam&0xc0000000)==0xc0000000){// Key up j(UX 6lR  
   switch(wParam) U8Cw7u2  
   { B44]NsYks~  
    case VK_MENU: 1\=pPys)  
     MaskBits&=~ALTBIT; he_HVRpB  
     break; lu<Np9/5<  
    case VK_CONTROL: Z={UM/6w  
     MaskBits&=~CTRLBIT; ]5aux >.n  
     break; |~Htj4K/  
    case VK_SHIFT: (0O`A~M3  
     MaskBits&=~SHIFTBIT; W8\PCXnsfl  
     break; /5a$@%  
    default: //judge the key and send message ^p'D<!6sK  
     break; Sj,4=a  
   } zlC^  
   for(int index=0;index<MAX_KEY;index++){ ~Q3WBOjn  
    if(hCallWnd[index]==NULL) E5v|SFD  
     continue; oC ^z_AtZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #mi0x06  
    { ?tW%"S^D  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1gf/#+$\  
     bProcessed=TRUE; )1X' W  
    } K gR1El. r  
   } \emT:Frb  
  } ?w c3 +?\J  
  else if((lParam&0xc000ffff)==1){ //Key down Oi+Qy[y2  
   switch(wParam) IIYX|;1}X  
   { *m `KU+o-u  
    case VK_MENU: /zDSlj<c  
     MaskBits|=ALTBIT; 4n `[SN  
     break; 7%~VOB  
    case VK_CONTROL: Y2ah zB  
     MaskBits|=CTRLBIT; Cf WK6>  
     break; SF78 s:_!_  
    case VK_SHIFT: o3(|FN  
     MaskBits|=SHIFTBIT; 2- |j  
     break; Hzk1LKsT#  
    default: //judge the key and send message #b<lt'gC  
     break; 'T #<OR  
   } J~nJpUyP*  
   for(int index=0;index<MAX_KEY;index++) &</ @0  
   { FW6E)df  
    if(hCallWnd[index]==NULL) JXRmu~W~l  
     continue; oeRYyJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :&\E\9  
    { D7n&9Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); PgGrk5;  
     bProcessed=TRUE; bb0{-T)1  
    } "pKGUM  
   } Kuzy&NI^w  
  } b(.o|d/P  
  if(!bProcessed){ "O"^\f  
   for(int index=0;index<MAX_KEY;index++){ t9=|* =;9)  
    if(hCallWnd[index]==NULL) 7lBQd(  
     continue; mF$jC:Tb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) (p#;6Xhf  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #L)4 |  
   } B'[3kJ'  
  } JUUF^/J  
 } o*5e14W(:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); O#89M%  
} SgQmYaa&  
dwsy(g7  
BOOL InitHotkey() Ltq*Vcl\  
{ J{'zkR?Lr  
 if(hHook!=NULL){ /:c,v-  
  nHookCount++; lhvZ*[[<)  
  return TRUE; SieV%T0t1  
 } 9zM4D  
 else \T#(rt\j  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); CI3_lWax%  
  if(hHook!=NULL) '~vSH9nx/  
   nHookCount++; & ,gryBN  
  return (hHook!=NULL); UY?]\4Om  
} QIxJFr;>  
BOOL UnInit() 5)zj){wL  
{ Dg2#Gv0B  
 if(nHookCount>1){ <` VJU2  
  nHookCount--; d)J] Y=j  
  return TRUE; OuJ y$e  
 } ;@;ie8H  
 BOOL unhooked = UnhookWindowsHookEx(hHook); RSVN(-wIi)  
 if(unhooked==TRUE){ sNan"  
  nHookCount=0; zdQu%q  
  hHook=NULL; CIs1*:Q9  
 } Fn0LE~O}-8  
 return unhooked; 0:(dl@I)@  
} ;>x1)|n5  
 ! 6i  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8 $*cfOC  
{ /iJhCB[QZ  
 BOOL bAdded=FALSE; NBR'^6  
 for(int index=0;index<MAX_KEY;index++){ o9SfWErZ  
  if(hCallWnd[index]==0){ Jj _+YfIM  
   hCallWnd[index]=hWnd; PI<s5bns {  
   HotKey[index]=cKey; F#C6.`B  
   HotKeyMask[index]=cMask; lNp:2P  
   bAdded=TRUE; VlXy&oZ  
   KeyCount++; nhaoh!8A6  
   break; #i#.tc  
  } T/.y(8!0I8  
 } 5^qp&  
 return bAdded; j`-y"6)  
} x?& xz;  
we).8%)'  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ku\#Wj|YrP  
{ @T=HcUP)  
 BOOL bRemoved=FALSE; nf@u7*# 6  
 for(int index=0;index<MAX_KEY;index++){ ?fX8WRdh  
  if(hCallWnd[index]==hWnd){ xM"XNT6b  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ J_br%AG<p  
    hCallWnd[index]=NULL; -`1L[-<d=/  
    HotKey[index]=0; YVV $g-D}  
    HotKeyMask[index]=0; T%#P??k  
    bRemoved=TRUE; hp%Pg &  
    KeyCount--; ^)]*10  
    break; X#C7r@H  
   } P VW9iT+c  
  } }^bL'  
 } _BA_lkN+D  
 return bRemoved; ?mUu(D:7D  
} 1s\hJATfz  
&l*dYzqq  
void VerifyWindow() ,TA [el%#  
{ Wb(0Szk;  
 for(int i=0;i<MAX_KEY;i++){ Ln -?/[E  
  if(hCallWnd!=NULL){ s3%8W==rBW  
   if(!IsWindow(hCallWnd)){ ]xeyXw84k  
    hCallWnd=NULL; KPcuGJ  
    HotKey=0; _NW OSt  
    HotKeyMask=0; { qx,X.5$  
    KeyCount--; ,H1~_|)<  
   } 6242qb  
  } @z RB4d$  
 } EqluxD=  
} \Y 4Z Q"0Q  
]997`,1b  
BOOL CHookApp::InitInstance() rq?x]`u   
{ F}[;ytmUS  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); c'qM$KN9G  
 hins=AfxGetInstanceHandle(); ]vFmY  
 InitHotkey(); R/YL1s  
 return CWinApp::InitInstance(); dEL"(e#0s4  
} }d]8fHG  
Wc G&W>  
int CHookApp::ExitInstance() N^N?!I  
{ ?R}oXSVT  
 VerifyWindow(); @>j \~<%  
 UnInit(); Q7%#3ML  
 return CWinApp::ExitInstance(); 'E,Yht=/}  
} .).<L`q  
zghm2{:`?g  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file \ChcJth@o<  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Tq8r SZi  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 1ouTZ'c?  
#if _MSC_VER > 1000 &3J#"9 _S  
#pragma once 5al{[mi  
#endif // _MSC_VER > 1000 b2%[9) "I.  
`pUArqf  
class CCaptureDlg : public CDialog ;N|>pSzmL  
{ jwox?]f+  
 // Construction }6N|+z.cU  
 public: 6f>HE'N  
  BOOL bTray; 2[hl^f^%,  
  BOOL bRegistered; e X@q'Zi  
  BOOL RegisterHotkey(); I,;)pWX=@  
  UCHAR cKey; iH=@``Z  
  UCHAR cMask; $z]l4Hj  
  void DeleteIcon(); )Cl&"bX  
  void AddIcon(); }tPl?P'`  
  UINT nCount; ^D|c  
  void SaveBmp(); STI3|}G*P  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor U\{Z{F%8  
  // Dialog Data KK?~i[aL  
  //{{AFX_DATA(CCaptureDlg) Vp$ckr  
  enum { IDD = IDD_CAPTURE_DIALOG }; H5{J2M,f  
  CComboBox m_Key; oH0\6:S  
  BOOL m_bControl; ~^*tIIOX  
  BOOL m_bAlt; JGe;$5|q8  
  BOOL m_bShift; Dr:}k*  
  CString m_Path; 5sE}B8 mF  
  CString m_Number; yw0uF  
  //}}AFX_DATA (I5ra_FVs  
  // ClassWizard generated virtual function overrides _p.{|7  
  //{{AFX_VIRTUAL(CCaptureDlg) elN3B91\6r  
 public: %XeU4yg\e  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 0^4*[?l9q  
 protected: 0&x)5^lG  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support W8^gPW*c5  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); dEiX! k$#  
  //}}AFX_VIRTUAL 49m/UeNZ  
  // Implementation k*Kq:$9"  
 protected: GZw<Y+/V"5  
  HICON m_hIcon; )94R\f  
  // Generated message map functions _xUXt)k  
  //{{AFX_MSG(CCaptureDlg) 5a/)|  
  virtual BOOL OnInitDialog(); a lR}|ez  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); "n:9JqPb  
  afx_msg void OnPaint(); {IVqV6:  
  afx_msg HCURSOR OnQueryDragIcon(); ^:#%TCJ  
  virtual void OnCancel(); $4"OD"Z Cq  
  afx_msg void OnAbout(); L!Ro`6|7;  
  afx_msg void OnBrowse(); `6A"e Da  
  afx_msg void OnChange(); PD?H5W3@  
 //}}AFX_MSG [I9d  
 DECLARE_MESSAGE_MAP() <3bh-)  
}; SUw{xGp  
#endif ZttL*KK  
-h_v(s2  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file SXL6)pX  
#include "stdafx.h" zM!*r~*k$  
#include "Capture.h" 'a}{s>{O  
#include "CaptureDlg.h" X%dOkHarB  
#include <windowsx.h> ziOmmL(r  
#pragma comment(lib,"hook.lib") !ZVMx*1Cf  
#ifdef _DEBUG j405G4BVW  
#define new DEBUG_NEW  }oG&zw  
#undef THIS_FILE dw-r}Qioe  
static char THIS_FILE[] = __FILE__; oAL-v428  
#endif {1Qwwhov  
#define IDM_SHELL WM_USER+1 (<CLftQKg  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); V)`? J)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); A9#2.5  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Dt ?Fs  
class CAboutDlg : public CDialog =p"0G%+%  
{ S:d` z'  
 public: <L-L}\-I"  
  CAboutDlg(); h^s}8y  
  // Dialog Data _i 8oWy1  
  //{{AFX_DATA(CAboutDlg) s0:1G -I  
  enum { IDD = IDD_ABOUTBOX }; uO6_lOT9n  
  //}}AFX_DATA Z(Vrmz2.  
  // ClassWizard generated virtual function overrides T:ck/:ZH  
  //{{AFX_VIRTUAL(CAboutDlg) 3FdoADe{{  
 protected: 1@y?OWC  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !cpBX>{w  
  //}}AFX_VIRTUAL ^j` vk  
  // Implementation I/tzo(r  
 protected: Q6BW ax|  
  //{{AFX_MSG(CAboutDlg) +]6 EkZO  
  //}}AFX_MSG GA|q[<U  
  DECLARE_MESSAGE_MAP() >#ou8}0  
}; u/zC$L3B(  
8,R]R=  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) BYY>;>V  
{ Y PM>FDxDB  
 //{{AFX_DATA_INIT(CAboutDlg) ReRRFkO"2  
 //}}AFX_DATA_INIT ]X5*e'  
} MMf6QxYf  
JUE>g8\b  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) \u*,~J)z  
{ 8P*n|]B.'  
 CDialog::DoDataExchange(pDX); Rpr# ,|  
 //{{AFX_DATA_MAP(CAboutDlg) T/3UF  
 //}}AFX_DATA_MAP gW, ET  
} 3.jwOFH$  
^;2L`U@5  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) KDhHp^IXQ  
 //{{AFX_MSG_MAP(CAboutDlg) V_~wWuZ-  
 // No message handlers /L~*FQQK>  
 //}}AFX_MSG_MAP pZR^ HOq  
END_MESSAGE_MAP() @|^C h+%@  
A=])pYE1  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) }O>IPRZ  
: CDialog(CCaptureDlg::IDD, pParent) Bj2rA.M  
{ b,'./{c0  
 //{{AFX_DATA_INIT(CCaptureDlg) nQ+{1 C  
  m_bControl = FALSE; P8EGd}2{8  
  m_bAlt = FALSE; OS,$}I[`8  
  m_bShift = FALSE; E|6|m8  
  m_Path = _T("c:\\"); H(X~=r  
  m_Number = _T("0 picture captured."); 9qPP{K,Pq2  
  nCount=0; *iR`mZb  
  bRegistered=FALSE; r[lHYO  
  bTray=FALSE; t_N `e(V  
 //}}AFX_DATA_INIT ' ZJ6p0  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 <L`R!}  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ?ix,Cu@M  
} Nr)(&c8  
4[#.N 3Y4*  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) r B)WHx<  
{ EZHEJW'JnE  
 CDialog::DoDataExchange(pDX); F7hQNQu:  
 //{{AFX_DATA_MAP(CCaptureDlg) nYe}d!  
  DDX_Control(pDX, IDC_KEY, m_Key); $D89|sy  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); V^ :\/EU  
  DDX_Check(pDX, IDC_ALT, m_bAlt); &><`?  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); N+tS:$V  
  DDX_Text(pDX, IDC_PATH, m_Path); :Y'nye3:  
  DDX_Text(pDX, IDC_NUMBER, m_Number); tY#^3ac  
 //}}AFX_DATA_MAP y5#_@  
} U".-C`4v  
&yN<@.  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) u>eu47"n!  
//{{AFX_MSG_MAP(CCaptureDlg) >!2'|y^  
 ON_WM_SYSCOMMAND() 8 2qe|XD4p  
 ON_WM_PAINT() =Dz[|$dV  
 ON_WM_QUERYDRAGICON() -7`J(f.rYC  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) aJF`rLm  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) k8ck#%#}Wu  
 ON_BN_CLICKED(ID_CHANGE, OnChange) %(]rc%ry0  
//}}AFX_MSG_MAP \Q$);:=q Q  
END_MESSAGE_MAP() /?GBp[(0  
o]Ki+ U  
BOOL CCaptureDlg::OnInitDialog() ?m!FM:%  
{ t|q=NK/  
 CDialog::OnInitDialog(); K?>&Mr  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 26**tB<  
 ASSERT(IDM_ABOUTBOX < 0xF000); U}7[8&k1  
 CMenu* pSysMenu = GetSystemMenu(FALSE); u|ZO"t  
 if (pSysMenu != NULL) h(L5MZs  
 { Px8E~X<@  
  CString strAboutMenu; 4Y2>w  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Yem\`; *  
  if (!strAboutMenu.IsEmpty()) (07d0<<[  
  { A3n"zxU  
   pSysMenu->AppendMenu(MF_SEPARATOR); `+uXL9mo  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); !S:@x.n@iR  
  } UXP;'  
 } yi OF&  
 SetIcon(m_hIcon, TRUE); // Set big icon 6D0,ME#  
 SetIcon(m_hIcon, FALSE); // Set small icon U*@_T3N  
 m_Key.SetCurSel(0); 2Kidbf  
 RegisterHotkey(); CmTJa5:  
 CMenu* pMenu=GetSystemMenu(FALSE); riL!]'akV  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Jj " {r{  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); f"Iyo:Wt  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); if'4MDl  
 return TRUE; // return TRUE unless you set the focus to a control hs4r5[  
} <Va>5R_d<  
LPO" K"'w  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 7r>W r#  
{ Oq5k4  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) UL%ihWq   
 { MF`'r#@:wa  
  CAboutDlg dlgAbout; =S,<yQJ  
  dlgAbout.DoModal(); TTpF m~?(  
 } Xhi?b|  
 else '_)t R;s  
 { $w\, ."y  
  CDialog::OnSysCommand(nID, lParam); M6iKl  
 } k:Q<Uanc[  
} R{_IrYk  
z3]U% y(,  
void CCaptureDlg::OnPaint() Q_.Fw\l$`  
{ /3]|B%W9  
 if (IsIconic())  4&D="GA  
 { *q{UipZbx  
  CPaintDC dc(this); // device context for painting 7 w,FA  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ^q\zC%.  
  // Center icon in client rectangle ub5hX{uT  
  int cxIcon = GetSystemMetrics(SM_CXICON); }c%y0)fL  
  int cyIcon = GetSystemMetrics(SM_CYICON); Ziimz}WHF  
  CRect rect; #9OP.4  
  GetClientRect(&rect); @XC97kGWp  
  int x = (rect.Width() - cxIcon + 1) / 2; wjOAgOC  
  int y = (rect.Height() - cyIcon + 1) / 2; -::%9D}P|  
  // Draw the icon <>s\tJ  
  dc.DrawIcon(x, y, m_hIcon); hm>*eJNp]  
 } VWt'Kx"  
 else ->=++  
 { u2-7vudh  
  CDialog::OnPaint(); )AXH^&  
 } Bw.&3efd  
} \DK*> k  
KTt$Pt/.  
HCURSOR CCaptureDlg::OnQueryDragIcon() y>|XpImZ  
{ "b4iOp&:=  
 return (HCURSOR) m_hIcon; ZnLk :6'  
} \*aLyyy3  
7"ps#)O  
void CCaptureDlg::OnCancel() y#;VGf6lj  
{ A'iF'<%  
 if(bTray) %+ a@|Z   
  DeleteIcon(); ^]&{"!  
  CDialog::OnCancel(); }TJ|d=  
} a] =\h'S  
Eu.qA9,@U  
void CCaptureDlg::OnAbout() O7'3}P;  
{ :b*`hWnQ  
 CAboutDlg dlg; FNCLGAiZ  
 dlg.DoModal(); /(ju  
} T,2Dr;  
hRIS [#z;U  
void CCaptureDlg::OnBrowse() KGmc*Jwy  
{ g{)H" 8L  
 CString str; ZHECcPhz  
 BROWSEINFO bi; =GKYroNM  
 char name[MAX_PATH]; I S8nvx\  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); XW_xNkpL5c  
 bi.hwndOwner=GetSafeHwnd(); tW"ptU^9)  
 bi.pszDisplayName=name; }9udo,RWu  
 bi.lpszTitle="Select folder"; K6*UFO4}i  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ]!G>8Rc  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 'ag6B(0Z  
 if(idl==NULL) I5yd )72  
  return; ^iRwwN=d  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); [S&O-b8A  
 str.ReleaseBuffer(); 3k*:B~1  
 m_Path=str; xT?}wF  
 if(str.GetAt(str.GetLength()-1)!='\\') gq_7_Y/  
  m_Path+="\\"; )):22}I#  
 UpdateData(FALSE); }42qMOi#w1  
} NU&^7[!yl  
&Dg)"Xji  
void CCaptureDlg::SaveBmp() C:GHP$/}  
{ &#PBww  
 CDC dc; K*U=;*p)  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); e(=~K@m  
 CBitmap bm; m7wc)"`t  
 int Width=GetSystemMetrics(SM_CXSCREEN); 4 ^~zN"6]  
 int Height=GetSystemMetrics(SM_CYSCREEN); x #X#V\w=  
 bm.CreateCompatibleBitmap(&dc,Width,Height); xe gL!  
 CDC tdc; 2u*h*/  
 tdc.CreateCompatibleDC(&dc); D PS1GO*  
 CBitmap*pOld=tdc.SelectObject(&bm); SXo[[ao  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 9p\Hx#^  
 tdc.SelectObject(pOld); r]JC~{  
 BITMAP btm; nl-t<#z[  
 bm.GetBitmap(&btm); %V<F<  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ,;cel^.b  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &!DZW 5  
 BITMAPINFOHEADER bih; T7lj39pJq  
 bih.biBitCount=btm.bmBitsPixel; VU`z|nBW@  
 bih.biClrImportant=0; 2 ]DCF  
 bih.biClrUsed=0; `gt&Y-  
 bih.biCompression=0; 6a%:zgkOpu  
 bih.biHeight=btm.bmHeight; %eJ\d?nw  
 bih.biPlanes=1; I*:qGr+ WJ  
 bih.biSize=sizeof(BITMAPINFOHEADER); TvWU[=4Yk  
 bih.biSizeImage=size; N(_ .N6  
 bih.biWidth=btm.bmWidth; N0K>lL=  
 bih.biXPelsPerMeter=0; i{|lsd(+  
 bih.biYPelsPerMeter=0; RQo$iISwy  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ~X~xE]1o|U  
 static int filecount=0; 4C,kA+P  
 CString name; FYXw$7'l  
 name.Format("pict%04d.bmp",filecount++); cZaF f?]k  
 name=m_Path+name; qu<B%v  
 BITMAPFILEHEADER bfh; Q3BLL` W~  
 bfh.bfReserved1=bfh.bfReserved2=0; 49xp2{  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 9 wSl,B-  
 bfh.bfSize=54+size; A#Q0{z@H  
 bfh.bfOffBits=54; 95$pG/o  
 CFile bf; \'; t*  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ nIV.9#~&  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); JNxW6 cK  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); y$j1?7  
  bf.WriteHuge(lpData,size); ]r/(n]=(  
  bf.Close(); *D=K{bUe'  
  nCount++; hi;WFyJTu  
 } _l#3]#  
 GlobalFreePtr(lpData); 6C:x6'5[  
 if(nCount==1) 9,S,NvSq  
  m_Number.Format("%d picture captured.",nCount); !sg%6H?}  
 else tk`: CT *  
  m_Number.Format("%d pictures captured.",nCount); r+p@X  
  UpdateData(FALSE); dr| | !{\  
} vQ:x% =]  
\yih 1Om>~  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) V.K70)]  
{ b:fxkQm  
 if(pMsg -> message == WM_KEYDOWN) %'{V%IXQ  
 { { A:LAAf[6  
  if(pMsg -> wParam == VK_ESCAPE) ]{K5zSK  
   return TRUE; Q<RT12|`  
  if(pMsg -> wParam == VK_RETURN) X!U]`Qh  
   return TRUE; DgDSVFk ~  
 } Rz`@N`U  
 return CDialog::PreTranslateMessage(pMsg); 3xBN10R#  
} q$MHCq;  
T1lXYhAWS  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) E/:+@'(k  
{ jmRhAJV  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ rU; g0'4e  
  SaveBmp(); IM[54_I  
  return FALSE; 8BHL  
} OfD@\;L  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ qzz[y#q(  
 CMenu pop; |2qR^Hd&5  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !c\7  
 CMenu*pMenu=pop.GetSubMenu(0); lN);~|IOv7  
 pMenu->SetDefaultItem(ID_EXITICON); h^['rmd  
 CPoint pt; |)^clkuGX  
 GetCursorPos(&pt); n)tU9@4Np  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); _mw13jcN]  
 if(id==ID_EXITICON) {GUb'J  
  DeleteIcon(); e-~hS6p(  
 else if(id==ID_EXIT) M,&tA1CH  
  OnCancel(); d0'7efC+  
 return FALSE; ~af8p {  
} Mg#`t$ u  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1W*V2`0>  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) DD2adu^  
 AddIcon(); (gLea  
 return res;  NI^{$QMj  
} }bZ 8-v  
I9;xzES  
void CCaptureDlg::AddIcon() Pl_^nFm0  
{ !syU]Yk  
 NOTIFYICONDATA data; pV8[l)J  
 data.cbSize=sizeof(NOTIFYICONDATA); eUYZxe :6  
 CString tip; 5n:nZ_D  
 tip.LoadString(IDS_ICONTIP); xne]Q(B>  
 data.hIcon=GetIcon(0); -48`#"xy  
 data.hWnd=GetSafeHwnd(); %z30=?VL  
 strcpy(data.szTip,tip); j]AekI4I  
 data.uCallbackMessage=IDM_SHELL; (m6EQoW^s+  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 'CgV0&@  
 data.uID=98; `4_c0 q)N4  
 Shell_NotifyIcon(NIM_ADD,&data); kPWBDpzN  
 ShowWindow(SW_HIDE);  1y 7y0V  
 bTray=TRUE; 18jJzYawh  
} B4@fY  
]7*kWc2  
void CCaptureDlg::DeleteIcon() tbg*_ZQO u  
{ B`#*o<eb  
 NOTIFYICONDATA data; nMkOUW:T!  
 data.cbSize=sizeof(NOTIFYICONDATA); UnP|]]o:I  
 data.hWnd=GetSafeHwnd(); [8.-(-/;  
 data.uID=98; Zgy7!AF!  
 Shell_NotifyIcon(NIM_DELETE,&data); _FT6]I0  
 ShowWindow(SW_SHOW); -ovoRI^6`}  
 SetForegroundWindow(); 7"#f!.E  
 ShowWindow(SW_SHOWNORMAL); '(tj[&aL  
 bTray=FALSE; v_.HGG S  
} V n^)  
0iF-}o  
void CCaptureDlg::OnChange() r5[4h'f  
{ ;uK";we  
 RegisterHotkey(); o OQ'*7_  
} pziq0  
F.68iN}  
BOOL CCaptureDlg::RegisterHotkey() ,%kmXh  
{ 9j0o&Xn  
 UpdateData(); se#@)LtZ  
 UCHAR mask=0; oXdel Ju?  
 UCHAR key=0; ;?zF6zvQ  
 if(m_bControl) Yh$fQ:yi\&  
  mask|=4; 3-iD.IAUm@  
 if(m_bAlt) R#ya,L  
  mask|=2; /9Z!p  
 if(m_bShift) "oe!M'aj`1  
  mask|=1; 6Kp}_^|z  
  key=Key_Table[m_Key.GetCurSel()]; ctHEEFWm  
 if(bRegistered){ AX;c}0g  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); |g!`\@O  
  bRegistered=FALSE; kutJd{68  
 } \sITwPA[z  
 cMask=mask; t0.;nv@A0  
 cKey=key; rI>LjHP  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >azEed<B  
 return bRegistered; T)~!mifX  
} W~yLl%  
Im+ 7<3Z  
  四、小结 l|q%%W0  
$ser+Jt=  
  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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