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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: o}AXp@cqi  
  *Soi  
  一、实现方法 Tz,-~mc  
`O\>vn  
  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: ,.)wCZ,wca  
Z)rW>I  
#pragma data_seg("shareddata") Ks.b).fH  
HHOOK hHook =NULL; //钩子句柄 Y|tHU'x  
UINT nHookCount =0; //挂接的程序数目 A]BeI  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ]Uv,}W  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 L)'G_)Sl  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey <pX?x3-'  
static int KeyCount =0; rL5=8l  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ^Om}9rXw1  
#pragma data_seg() L( 6b2{"  
!f~a3 {;j  
  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。 R~g|w4a@sC  
!gX xM,R  
  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: \+o\wTW  
fK/:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR tc~gn!"  
cKey,UCHAR cMask) RC_Pj)  
{ SAm%$v z%M  
 BOOL bAdded=FALSE; "c%wq 0  
 for(int index=0;index<MAX_KEY;index++){ WDc[+Xyw  
  if(hCallWnd[index]==0){ XFhH+4#]  
   hCallWnd[index]=hWnd; 2!%)_<  
   HotKey[index]=cKey; 3bRxV @0.  
   HotKeyMask[index]=cMask; Gk:fw#R  
   bAdded=TRUE; NM. e4  
   KeyCount++; FvsVfV U  
   break; Ct=bZW"j/  
  } VEWW[ T  
 } 4  %0s p  
 return bAdded; hW*o;o7u  
} <'\Nv._2a  
//删除热键 PZ]tl  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5_9`v@-4_  
{ w{tA{{  
 BOOL bRemoved=FALSE; A{_CU-,  
 for(int index=0;index<MAX_KEY;index++){ v47' dC  
  if(hCallWnd[index]==hWnd){ ".}R$ W  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ WuK<?1meN  
    hCallWnd[index]=NULL; V!:!c]8F  
    HotKey[index]=0; e:G~P u`  
    HotKeyMask[index]=0; > .wZEQ6QK  
    bRemoved=TRUE; 3Zp<#  
    KeyCount--; <#0i*PM_  
    break; +^7cS6"L  
   } J&6p/'UPZ  
  } p3P8@M  
 } P& 1$SWNyW  
 return bRemoved; w:zo \  
} Cmx<>7fN  
nlv,j&  
S}C[  
  DLL中的钩子函数如下: 6mcb'hy  
i#:To |\u  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) b!H1 |7>  
{ gJ l^K  
 BOOL bProcessed=FALSE;  +P(*S  
 if(HC_ACTION==nCode) Gamn,c9  
 { <EC"E #p  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 aImzK/  
   switch(wParam) t jM9EP  
   {  rxp|[>O<  
    case VK_MENU: C^q|(G)  
     MaskBits&=~ALTBIT; O>)eir7  
     break; 5AT^puL]]  
    case VK_CONTROL: s9C^Cy^su  
     MaskBits&=~CTRLBIT; 0H_Ai=G  
     break; qT?{}I  
    case VK_SHIFT: W*LC3B^  
     MaskBits&=~SHIFTBIT; t|@5 ,J  
     break; SGKAx<U  
    default: //judge the key and send message `n>/MY  
     break; cyNE}  
   } O/eZ1YAC  
   for(int index=0;index<MAX_KEY;index++){ ?;tPqOs&  
    if(hCallWnd[index]==NULL) z$&B7?  
     continue; |5flvkid  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >33=0<  
    { _`gF%$]b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Mmz; uy_  
     bProcessed=TRUE; T#*,ME7|m  
    } fTEZ@#p  
   } Mnranhe>G  
  } 1ZF KLI`V  
  else if((lParam&0xc000ffff)==1){ //有键按下 !w7/G  
   switch(wParam) -aT-<+?s  
   { inW7t2p<s  
    case VK_MENU: RZW=z}T+H  
     MaskBits|=ALTBIT; J@>|`9T9$  
     break; YI0l&'7  
    case VK_CONTROL: ") 8l'^Mq2  
     MaskBits|=CTRLBIT; |-JG _i  
     break; eX\v;~W*  
    case VK_SHIFT: w,P@@Q E  
     MaskBits|=SHIFTBIT; co,0@.i  
     break; r (m3"Xu6O  
    default: //judge the key and send message 3?E7\\/R  
     break; B2r[oT R  
   } +kWWx#L#  
   for(int index=0;index<MAX_KEY;index++){ EUSM4djL  
    if(hCallWnd[index]==NULL) "nr?WcA  
     continue; `:'ciY|%b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <?A4/18K  
    { ,?LE5]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +~=a$xA[C  
     bProcessed=TRUE; Q7y' 0s  
    } '$,yV f  
   } NioqJG?p  
  } h`U-{VIrqi  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 7bYwh8  
   for(int index=0;index<MAX_KEY;index++){ R\cx-h*  
    if(hCallWnd[index]==NULL) R.i ]6H!  
     continue; w*{{bISw|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) W$]qo|2P  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8K2@[TE=5  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 M? 8sy  
   } 3^KR{N p  
  } v[|-`e*  
 } uWx<J3~q.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); YXo?(T..  
} +8<$vzB  
L)M{S3q,  
  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: 8}yrsF #  
4evN^es'I_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _L=-z*a\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >4@w|7lS  
(PE.v1T  
  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: a;5clonB  
`BZ|[ q3  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *& w/*h$!  
{ pku\)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) N!.o`4 "z  
 { BqJ|l7+  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 7&,$  
  SaveBmp(); ZeG4z({af  
  return FALSE; UD14q~ (1Z  
 } pcv\|)&}  
 …… //其它处理及默认处理 b7hICO-w  
} pIR_2Eq  
.hckZx /  
n-K/d I  
  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。 !>'A2V~F  
8nZ_.  
  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。 nt"\FZ*;3  
"~ =O`5V  
  二、编程步骤 S? Cd,WxT  
m>Z3p7!N}  
  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"; O-.G("  
)09ltr0@"  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ?h1g$SBxk  
w3i74C&0  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 2iKteJ@h)  
E6R\ DM  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; @u$NB3  
R{[v#sF >#  
  5、 添加代码,编译运行程序。 pj7a l;  
F,as>X#  
三、程序代码 cGs& Kn;h  
PE;<0Cz\  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ){mqo%{SO  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) m2~`EL>  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ LRw-I.z  
#if _MSC_VER > 1000 B4HMs$>   
#pragma once TP| ogF?  
#endif // _MSC_VER > 1000 }@.@k6`n  
#ifndef __AFXWIN_H__ (mbm',%-(  
#error include 'stdafx.h' before including this file for PCH Dy5&-yk  
#endif jHob{3  
#include "resource.h" // main symbols Mi NEf  
class CHookApp : public CWinApp ouyZh0 G  
{ 'h;qI&  
 public: w^cQL%  
  CHookApp(); %<+Ku11  
  // Overrides oR%cG"y  
  // ClassWizard generated virtual function overrides HoX={^aG%  
  //{{AFX_VIRTUAL(CHookApp) S -,$ (  
 public: f/z]kfgw  
  virtual BOOL InitInstance(); 'w1ll9O  
  virtual int ExitInstance(); 'k}w|gNB  
  //}}AFX_VIRTUAL IR3+BDE)>  
  //{{AFX_MSG(CHookApp) N`d%4)|{  
  // NOTE - the ClassWizard will add and remove member functions here. &hZ.K"@7{  
  // DO NOT EDIT what you see in these blocks of generated code ! mz x$(u  
  //}}AFX_MSG #lik: ?  
  DECLARE_MESSAGE_MAP() :RDk{^b)  
}; 5w~ 0Q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 1fV)tvU$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N,8.W"fV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E|oOd<z  
BOOL InitHotkey(); {|0YcL  
BOOL UnInit(); 9*~";{O.Oa  
#endif *yHz#u'  
R4b!?}d  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. *Cp:<M nd  
#include "stdafx.h" ffI=Bt]t  
#include "hook.h" 7'8G,|&:*  
#include <windowsx.h> 74NL)|M  
#ifdef _DEBUG ./zzuKO8XK  
#define new DEBUG_NEW L)<~0GcP  
#undef THIS_FILE M%$ITE  
static char THIS_FILE[] = __FILE__; h'GOO(  
#endif uwi.Sg11  
#define MAX_KEY 100 4Q1R:Ra  
#define CTRLBIT 0x04 X]2x0  
#define ALTBIT 0x02 ,*9gy$  
#define SHIFTBIT 0x01 zgGJ<=G.  
#pragma data_seg("shareddata") YADXXQ"  
HHOOK hHook =NULL; xEq?[M  
UINT nHookCount =0; O`!XW8  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ml)\RL  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT #N|JC d_  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ,y-!h@(  
static int KeyCount =0; ? 47"$=G  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift o:*$G~. k  
#pragma data_seg() V@y&n1?6  
HINSTANCE hins; (+xT5 2  
void VerifyWindow(); mBB"e"o  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ;*+H&  
//{{AFX_MSG_MAP(CHookApp) !M)] 1Y  
// NOTE - the ClassWizard will add and remove mapping macros here. uT=5zu  
// DO NOT EDIT what you see in these blocks of generated code! *aFh*-Sj2I  
//}}AFX_MSG_MAP (["V( $  
END_MESSAGE_MAP() oO7)7$|1  
ang~_Ec.  
CHookApp::CHookApp() hhWy-fP#  
{ \QG2V$  
 // TODO: add construction code here, y\CxdTs  
 // Place all significant initialization in InitInstance -s)h ?D  
} wSM(!:on5  
B+jh|@-  
CHookApp theApp; 8$RiFD ,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) B>I :KGkV  
{ _d^d1Q}V  
 BOOL bProcessed=FALSE; I(k(p\l%  
 if(HC_ACTION==nCode) $tc1 te  
 { *5XOYb?'v.  
  if((lParam&0xc0000000)==0xc0000000){// Key up xDPR^xY  
   switch(wParam) "~zLG"  
   { UxF9Ko( ]d  
    case VK_MENU: |+[Y_j  
     MaskBits&=~ALTBIT; $*:$-  
     break; tnBCO%uG  
    case VK_CONTROL: Lr d-  
     MaskBits&=~CTRLBIT; .!+7|us8l\  
     break; ,h/l-#KS  
    case VK_SHIFT: f)Y~F/[$P  
     MaskBits&=~SHIFTBIT; =HV${+K=~  
     break; 0`v-pL0|  
    default: //judge the key and send message M^ e}w!U  
     break; 5yj#9H  
   } \"L0d1DK)  
   for(int index=0;index<MAX_KEY;index++){ +T4}wm  
    if(hCallWnd[index]==NULL) &U`ug"/k  
     continue; WWOt>C~zV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) r=7!S8'  
    { jS8B:>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); [#G*GAa6*  
     bProcessed=TRUE; )%kiM<})  
    } d0Ubt  
   } M} ri>o  
  } O'@[ f{  
  else if((lParam&0xc000ffff)==1){ //Key down mC-wPi8  
   switch(wParam) @Cx goX^  
   { LylCr{s7  
    case VK_MENU: Xx2t0AIB  
     MaskBits|=ALTBIT; z;/8R7L&  
     break; D6fd(=t1Z  
    case VK_CONTROL: (u='&ka  
     MaskBits|=CTRLBIT; /?b{*<TK  
     break; zMO#CZ t  
    case VK_SHIFT: Hr7pcz/#l  
     MaskBits|=SHIFTBIT; 5:5d=7WX  
     break; =}I=s@  
    default: //judge the key and send message Aeo=m}C;  
     break; 9x8Vsd  
   } '{.8tT ?tJ  
   for(int index=0;index<MAX_KEY;index++) M^hz<<:$  
   { ^^n (s_g  
    if(hCallWnd[index]==NULL) m],.w M8  
     continue; Bu?Qyz2O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m6}_kzFz  
    { {.;qz4d`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); hM>.xr  
     bProcessed=TRUE; N_Zd.VnY  
    } %~>-nqS  
   } 4M6[5RAW{  
  } w-NTw2x,&  
  if(!bProcessed){ F ~7TE91C  
   for(int index=0;index<MAX_KEY;index++){ 5DkEJk7a  
    if(hCallWnd[index]==NULL) "3a}~J<g  
     continue; ?| 6sTu!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :>_oOn[_  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *DZ7,$LQ~D  
   } [7LdTY"Tl  
  } D,lY_6=  
 } &h!O<'*2  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4}UJ Bb?  
} F0r2=f(?  
%XZhSmlf  
BOOL InitHotkey() _ yDDPuAi  
{ f|F=)tJO  
 if(hHook!=NULL){ JY;u<xl  
  nHookCount++; $"MVr5q6  
  return TRUE; -XK;B--c  
 } 3u+i  
 else EAxdF u  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ]|=`-)AP3  
  if(hHook!=NULL) yx*<c#Uf  
   nHookCount++; )~ &gBX  
  return (hHook!=NULL); #N~1Y e  
} \j BA4?(S  
BOOL UnInit() D/;[x{;E  
{ YTTi j|(  
 if(nHookCount>1){ G-R83Orl  
  nHookCount--; bu $u@:q 6  
  return TRUE; JL{fW>5y|  
 } J~oxqw}  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 2dHsM'ze  
 if(unhooked==TRUE){ o1*P|.`  
  nHookCount=0; xirq$sEl  
  hHook=NULL; L<B)BEE.  
 } ^Pu:&:ki  
 return unhooked; $d4&H/u^  
} ^K_FGE0ec  
h;y}g/HZ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Qe4 % A  
{ X%N!gy  
 BOOL bAdded=FALSE; PBFpV8P,  
 for(int index=0;index<MAX_KEY;index++){ s1#A0%gx  
  if(hCallWnd[index]==0){ bKzG5|Qu  
   hCallWnd[index]=hWnd; D&G?Klq  
   HotKey[index]=cKey; Uq{$j5p8  
   HotKeyMask[index]=cMask; @#-\ BQ;  
   bAdded=TRUE; '$'a .q1q9  
   KeyCount++; ct OCj$$u  
   break; ""|;5kJS4  
  } lFSvHs5  
 } 9vwm RVN  
 return bAdded; [F;\NJp6?^  
} mE>{K  
Tr|PR t  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) HVhd#Q;  
{ W,H=K##6<  
 BOOL bRemoved=FALSE; 'Nuy/\[{\  
 for(int index=0;index<MAX_KEY;index++){ P{:Zxli0  
  if(hCallWnd[index]==hWnd){ w:iMrQeJg  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ r ?<kWR?w  
    hCallWnd[index]=NULL; ?,+&NX3m  
    HotKey[index]=0; 'jO8C2Th%  
    HotKeyMask[index]=0; l]Xbd{  
    bRemoved=TRUE; B4*y-Q.*  
    KeyCount--; xO<%lq`  
    break; u2`j\ Vu  
   } x*=m'IM[  
  } @ uN+]e+3  
 } x>tm[k  
 return bRemoved; jt: *Y  
} 4<)*a]\c5M  
S#HeOPRL  
void VerifyWindow() @'GPZpbvZ  
{ F?6Q(mRl  
 for(int i=0;i<MAX_KEY;i++){ (NDC9Lls  
  if(hCallWnd!=NULL){ J4U_utp  
   if(!IsWindow(hCallWnd)){ G51-CLM,  
    hCallWnd=NULL; , /jHhKW  
    HotKey=0; 5JK'2J&  
    HotKeyMask=0; %g89eaEZ  
    KeyCount--; B!8X?8D  
   } 8faT@J'e;  
  } $ <C",&  
 } 0=t2|,}  
} .J&89I]U  
S'w}Ir  
BOOL CHookApp::InitInstance() Y  9z*xS  
{ U>bIQk"4  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 'irwecd8  
 hins=AfxGetInstanceHandle(); ` "-P g5  
 InitHotkey(); 4GeN<9~YS  
 return CWinApp::InitInstance(); n9k  
} $cwmfF2C  
!$ii*}  
int CHookApp::ExitInstance() Y6hV ;[\F  
{ PApr8Xe  
 VerifyWindow(); D^P0X:T]  
 UnInit(); %zRuIDmv  
 return CWinApp::ExitInstance(); "UhE'\()  
} A #m_w*  
PYs0w6o  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 0dS(g&ZR  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) u^c/1H:6  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ X eY[;}9  
#if _MSC_VER > 1000 { D|ST2:E  
#pragma once X&5N 89  
#endif // _MSC_VER > 1000 <SOG?Lh~  
,{msJyacmR  
class CCaptureDlg : public CDialog d)D!np=  
{ &m[}%e%~0  
 // Construction !g}@xwWax  
 public: gzH;`,  
  BOOL bTray; %[9ty`UE  
  BOOL bRegistered; ad47 42  
  BOOL RegisterHotkey(); Tz.okCo]z  
  UCHAR cKey; j)@{_tv6;  
  UCHAR cMask; ;;XY&J  
  void DeleteIcon(); bwP@}(K  
  void AddIcon(); [cZ/)tm  
  UINT nCount; 2J$vX(  
  void SaveBmp(); BhbfPQ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor tlg}"lY  
  // Dialog Data u2$.EM/iae  
  //{{AFX_DATA(CCaptureDlg) uTPAf^|  
  enum { IDD = IDD_CAPTURE_DIALOG }; k\*?<g  
  CComboBox m_Key; n5BD0q  
  BOOL m_bControl; t0v >J9  
  BOOL m_bAlt; 7r)]9_[(  
  BOOL m_bShift; !O}e)t  
  CString m_Path; 8y_(Iu|:  
  CString m_Number; c9Cc%EK  
  //}}AFX_DATA xx7&y !_  
  // ClassWizard generated virtual function overrides k$8Zg*)  
  //{{AFX_VIRTUAL(CCaptureDlg) NG:4Q.G1g  
 public: @OUBo;/  
  virtual BOOL PreTranslateMessage(MSG* pMsg); JdUdl_D z  
 protected: TgDT  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Xo[cpcV  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); )p>p3b g  
  //}}AFX_VIRTUAL u>agVB4\F  
  // Implementation 8\:>;XG6f  
 protected: 7t}s5}Z 4  
  HICON m_hIcon; k{b|w')  
  // Generated message map functions uysTyzx  
  //{{AFX_MSG(CCaptureDlg) F$1{w"&  
  virtual BOOL OnInitDialog(); a_{'I6a*,  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); C!+PBk[9  
  afx_msg void OnPaint(); tX1`/}``  
  afx_msg HCURSOR OnQueryDragIcon(); )\2KDXc  
  virtual void OnCancel(); /38I (0  
  afx_msg void OnAbout(); 5rCJIl.  
  afx_msg void OnBrowse(); f? GoBh<  
  afx_msg void OnChange(); $ve$Sq  
 //}}AFX_MSG i[FYR;C  
 DECLARE_MESSAGE_MAP() tSoF!@6  
}; y:$qX*+9e  
#endif  AW|SD  
y!R9)=/M  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file qxHn+O!h  
#include "stdafx.h" m?Cb^WgcF  
#include "Capture.h" Oj_F1. r  
#include "CaptureDlg.h" *&_cp]3-WF  
#include <windowsx.h> 5=p<"*zJ  
#pragma comment(lib,"hook.lib") *3@8,~_tp  
#ifdef _DEBUG B1E:P`t  
#define new DEBUG_NEW B^zg#x#8  
#undef THIS_FILE G973n  
static char THIS_FILE[] = __FILE__; *14:^neoI  
#endif -O=xgvh"  
#define IDM_SHELL WM_USER+1 v UO[V$rx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5[)#3vY  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ya^8mp-  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; C\ Yf]J  
class CAboutDlg : public CDialog fi~@J`  
{ )t7MD(  
 public: GVn'p Wg  
  CAboutDlg(); 7 <]YK`a2d  
  // Dialog Data n6Uf>5  
  //{{AFX_DATA(CAboutDlg)  < ]+Mdy  
  enum { IDD = IDD_ABOUTBOX }; #Hu# #x|  
  //}}AFX_DATA 0YfmAF$/B  
  // ClassWizard generated virtual function overrides kX}sDvP3  
  //{{AFX_VIRTUAL(CAboutDlg) *mWl=J;u  
 protected: gN[t  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support J]S30&?  
  //}}AFX_VIRTUAL S*J\YcqSC  
  // Implementation S>*i\OnI'  
 protected: o]qwN:8^  
  //{{AFX_MSG(CAboutDlg) ~dLbhjde n  
  //}}AFX_MSG 60A!Gob  
  DECLARE_MESSAGE_MAP() 2$!,$J-<Y  
}; es%py~m)  
D/4]r@M2c  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) I!1+#0SG  
{ _!Tjb^  
 //{{AFX_DATA_INIT(CAboutDlg) ~Jw84U{$  
 //}}AFX_DATA_INIT 'X6Y!VDd  
} }opMf6`w  
1|H4]!7kE  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) :(yu t  
{ |#yT]0L%pA  
 CDialog::DoDataExchange(pDX); w{*V8S3h9  
 //{{AFX_DATA_MAP(CAboutDlg) 0_+ & [g}  
 //}}AFX_DATA_MAP }-XZ1qr  
} cwtlOg  
(0`w.n  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) aE3eYl9u  
 //{{AFX_MSG_MAP(CAboutDlg) ]$^HGmP  
 // No message handlers ME]89 T &  
 //}}AFX_MSG_MAP mQ`2c:Rn&7  
END_MESSAGE_MAP() =ePX^J*M'  
N1.1  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Lz-|M?(  
: CDialog(CCaptureDlg::IDD, pParent) 8d Fqwpw8  
{ Y hmveV  
 //{{AFX_DATA_INIT(CCaptureDlg) WDV=]D/OE  
  m_bControl = FALSE; 6d/v%-3  
  m_bAlt = FALSE; +s;Vfc$b]H  
  m_bShift = FALSE; hmG8 {h/  
  m_Path = _T("c:\\"); ~ QohP`_  
  m_Number = _T("0 picture captured."); g&EK^q  
  nCount=0; |4 2;171  
  bRegistered=FALSE; _29wQn@]  
  bTray=FALSE; S+wT}_BQ  
 //}}AFX_DATA_INIT ~%M*@ fm  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 shy[>\w  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); U@n5:d=  
} z\8s |!  
o:3(J}  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) vx ' ];  
{ kw gLK@@%1  
 CDialog::DoDataExchange(pDX); `VUJW]wGu  
 //{{AFX_DATA_MAP(CCaptureDlg) 2  @T~VRy  
  DDX_Control(pDX, IDC_KEY, m_Key); R2C~.d_TDu  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); {[Y7h}7  
  DDX_Check(pDX, IDC_ALT, m_bAlt); jrz.n 4Y`  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 'wMvO{}$  
  DDX_Text(pDX, IDC_PATH, m_Path); $o\z4_I  
  DDX_Text(pDX, IDC_NUMBER, m_Number); L+ XAbL)  
 //}}AFX_DATA_MAP AL,7rYZG$  
} IEP|j;~*  
B)L0hi  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) IO=$+c  
//{{AFX_MSG_MAP(CCaptureDlg) $_TS]~y4}  
 ON_WM_SYSCOMMAND() +S-60EN*A  
 ON_WM_PAINT() fR{_P  
 ON_WM_QUERYDRAGICON() 7ZyP  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) +,$pcf<[V  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) =_m3 ~=Z  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 3RvDX p  
//}}AFX_MSG_MAP mv~?1aIKD  
END_MESSAGE_MAP() zb"4_L@m2  
PeqW+Q.  
BOOL CCaptureDlg::OnInitDialog() 3tJfh=r=1  
{ !~R<Il|B  
 CDialog::OnInitDialog(); !.t D.(XP  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 74:~F)BP  
 ASSERT(IDM_ABOUTBOX < 0xF000); rKFnivGT  
 CMenu* pSysMenu = GetSystemMenu(FALSE); $M!iQ"bb  
 if (pSysMenu != NULL) CxJ3u  
 { j3N d4#  
  CString strAboutMenu; N|>JLZ>  
  strAboutMenu.LoadString(IDS_ABOUTBOX); .QZjJ9pvK  
  if (!strAboutMenu.IsEmpty()) i4h`jFS  
  { 9%NobT  
   pSysMenu->AppendMenu(MF_SEPARATOR); IvY3iRq6  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 5~jz| T}s  
  } GbZ~e I`,2  
 } j|&D(]W/  
 SetIcon(m_hIcon, TRUE); // Set big icon @|wU @by{  
 SetIcon(m_hIcon, FALSE); // Set small icon kN{$-v=K  
 m_Key.SetCurSel(0); ISK 8t  
 RegisterHotkey(); h!|Uj  
 CMenu* pMenu=GetSystemMenu(FALSE); r<:d+5"  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); FBB<1({A  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); G}+@C]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); {I $iD  
 return TRUE; // return TRUE unless you set the focus to a control hwL`9.w  
} |3T2}ohrr  
-vT{D$&1  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) \-[bU6\A\  
{ }79jyS-e  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) /d:hW4}<}.  
 { Y_jc*S  
  CAboutDlg dlgAbout; D|m3. si  
  dlgAbout.DoModal(); /VufL+q1  
 } *>mjUT}cP  
 else "-X8  
 { x0ipk}  
  CDialog::OnSysCommand(nID, lParam); +L.D3  
 } K?! W9lUq  
} _E'}8.#{  
y?O-h1"3,  
void CCaptureDlg::OnPaint() DbFe;3  
{ `O0Qtq.  
 if (IsIconic()) c^pQitPv  
 { "U eq  
  CPaintDC dc(this); // device context for painting 9*K-d'm  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); a@|H6:|  
  // Center icon in client rectangle  ,Zb  
  int cxIcon = GetSystemMetrics(SM_CXICON); +75"Q:I  
  int cyIcon = GetSystemMetrics(SM_CYICON); kp<Au)u  
  CRect rect; [M%? [E}>  
  GetClientRect(&rect); &oHr]=xA  
  int x = (rect.Width() - cxIcon + 1) / 2; +>*=~R  
  int y = (rect.Height() - cyIcon + 1) / 2; oQm XKV+[v  
  // Draw the icon r nr-wUW@  
  dc.DrawIcon(x, y, m_hIcon); mTWd+mx  
 } )8#-IXxp  
 else S(xs;tZ  
 { 'Rsr*gX#  
  CDialog::OnPaint(); _D?/$D7u#%  
 } X`WS&!C<  
} Jj=N+,km  
U/s Z1u-  
HCURSOR CCaptureDlg::OnQueryDragIcon() h4 9q(085V  
{ eWex/ m  
 return (HCURSOR) m_hIcon; fiA8W  
} x4wTQ$*1  
wEX<[#a-  
void CCaptureDlg::OnCancel() o -)[{o\  
{ %$Py@g  
 if(bTray) B; NK\5>  
  DeleteIcon(); G7+{O7  
  CDialog::OnCancel(); 71P. 9Iz  
} Q%?%zuU  
q. Jx|x  
void CCaptureDlg::OnAbout() Ij.mLO]  
{ IZLCwaW  
 CAboutDlg dlg; W5Pur lu?  
 dlg.DoModal(); HpIi-Es7C  
} 2}/r>]9^-  
- ry  
void CCaptureDlg::OnBrowse() Yu_ eCq5/  
{ ( 2L,m  
 CString str; C(B"@   
 BROWSEINFO bi; CALD7qMK  
 char name[MAX_PATH]; t g-(e=S4P  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); DBcR1c&<H  
 bi.hwndOwner=GetSafeHwnd(); +4T.3Njjn  
 bi.pszDisplayName=name; F}meKc?a  
 bi.lpszTitle="Select folder"; Vn{;8hZ :a  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ^OIo  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ^q/^.Gf  
 if(idl==NULL) ,P`GIGvkA  
  return; ^b|? ?9&  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); +MaEet  
 str.ReleaseBuffer(); GeB&S!F  
 m_Path=str;  ?f'`b<o  
 if(str.GetAt(str.GetLength()-1)!='\\') Hmhsb2`\  
  m_Path+="\\"; Y:m8UnT  
 UpdateData(FALSE); z2,NWmP|w  
} $yj*n;  
2 V\hG?<  
void CCaptureDlg::SaveBmp() >!" Sr3,L  
{ 1pDU}rPJ.  
 CDC dc; :R:@V#Y  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); tK{#kApHGG  
 CBitmap bm; <zvtQ^{]  
 int Width=GetSystemMetrics(SM_CXSCREEN); _4SZ9yu  
 int Height=GetSystemMetrics(SM_CYSCREEN); # .(f7~  
 bm.CreateCompatibleBitmap(&dc,Width,Height); lV 4TFt ,  
 CDC tdc; 7SYe:^Dx  
 tdc.CreateCompatibleDC(&dc); d#bg(y\G|  
 CBitmap*pOld=tdc.SelectObject(&bm); %P<fz1  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); h,BPf5\S  
 tdc.SelectObject(pOld); $t"QLsk0  
 BITMAP btm; +N+117m  
 bm.GetBitmap(&btm); mr#.uhd.z  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Sw-2vnSdM  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Z> Rshtg  
 BITMAPINFOHEADER bih; <6+B;brh  
 bih.biBitCount=btm.bmBitsPixel; [kr-gV  
 bih.biClrImportant=0; r^rk@W;[  
 bih.biClrUsed=0; 5? Y(FhnIC  
 bih.biCompression=0; /@&o%I3h  
 bih.biHeight=btm.bmHeight; b 1Wz  
 bih.biPlanes=1; z4(\yx  
 bih.biSize=sizeof(BITMAPINFOHEADER); )t-P o'RW  
 bih.biSizeImage=size; _1$Y\Y  
 bih.biWidth=btm.bmWidth; yW7>5r  
 bih.biXPelsPerMeter=0; rZ-< Ryg  
 bih.biYPelsPerMeter=0; 1)ij*L8k  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); tlvZy+Blv  
 static int filecount=0; E2cZk6~m{  
 CString name; ZK'WKC  
 name.Format("pict%04d.bmp",filecount++); _<c}iZv@  
 name=m_Path+name; .:Wp9M  
 BITMAPFILEHEADER bfh; iRG6Cw2  
 bfh.bfReserved1=bfh.bfReserved2=0; RX?!MDO  
 bfh.bfType=((WORD)('M'<< 8)|'B'); l"X,[  
 bfh.bfSize=54+size; &c&TQkx  
 bfh.bfOffBits=54; D^F=:-l m  
 CFile bf; -OD&x%L*{3  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ \?8q&o1=]  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); &;JeLL1J  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 8 E l hcs  
  bf.WriteHuge(lpData,size); 3jJV5J'"  
  bf.Close(); k6z]"[yu  
  nCount++; Zn)o@'{}{  
 } -}oH],C  
 GlobalFreePtr(lpData); ]qq2VO<b  
 if(nCount==1) .Sa=VC?EZ  
  m_Number.Format("%d picture captured.",nCount); j%]sym  
 else R!X+-  
  m_Number.Format("%d pictures captured.",nCount); gC kR$.-E  
  UpdateData(FALSE); ZDI?"dt{  
} O6b+eS  
?LU>2!jN  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) kqo4 v;r  
{ :2vuc!Pu  
 if(pMsg -> message == WM_KEYDOWN) j8^ #698X  
 { b~)2`l  
  if(pMsg -> wParam == VK_ESCAPE) E|_8#xvb  
   return TRUE; a7u*d`3X=  
  if(pMsg -> wParam == VK_RETURN) z}$.A9yn  
   return TRUE; [GI2%uA0  
 } !a!4^zqp  
 return CDialog::PreTranslateMessage(pMsg); {dE(.Z?]!#  
} PGYx] r  
+tg${3ti_  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $X\2h+ Os  
{ zO$r   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 'T7 3V  
  SaveBmp(); vAeVQ~  
  return FALSE; r_tt~|s,>  
} 4sH?85=j  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <KCyXU*  
 CMenu pop; ubVZEsoW?  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); K g.O2F77  
 CMenu*pMenu=pop.GetSubMenu(0); i 2uSPV!Tf  
 pMenu->SetDefaultItem(ID_EXITICON); P;'ZdZ(SLu  
 CPoint pt; u:l<NWF^  
 GetCursorPos(&pt); RwrRN+&s\  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); (./Iq#@S  
 if(id==ID_EXITICON) 8+Gwv SDU  
  DeleteIcon(); >T0`( #Lm  
 else if(id==ID_EXIT) #(+V&< K  
  OnCancel(); s+&0Z3+  
 return FALSE; sP% b? 6  
} swJQwY   
LRESULT res= CDialog::WindowProc(message, wParam, lParam); .V UnOdI  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) _E6N*ORV  
 AddIcon(); zq?xY`E  
 return res; 8$ X3J[_j  
} 10m|?  
2 1+[9  
void CCaptureDlg::AddIcon() Q~' \oWz  
{ UYW'pV  
 NOTIFYICONDATA data; e$`hRZ%  
 data.cbSize=sizeof(NOTIFYICONDATA); {9XNh[NbP  
 CString tip; `@0AGSzUv  
 tip.LoadString(IDS_ICONTIP); ,zK E$  
 data.hIcon=GetIcon(0); ;3bUgI}.J  
 data.hWnd=GetSafeHwnd(); 4HGS  
 strcpy(data.szTip,tip); ST g} Z  
 data.uCallbackMessage=IDM_SHELL; "i*gJFW|  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ;$4&Qp:#  
 data.uID=98; 2hryY  
 Shell_NotifyIcon(NIM_ADD,&data); "*MF=VB1  
 ShowWindow(SW_HIDE); |}<Gz+E>  
 bTray=TRUE;  AKk&  
} HN5,MD[  
qFq$a9w|@  
void CCaptureDlg::DeleteIcon() BD^1V( I/  
{ 2vsV :LS.  
 NOTIFYICONDATA data; /?z3*x  
 data.cbSize=sizeof(NOTIFYICONDATA); +~y>22Zfg  
 data.hWnd=GetSafeHwnd(); ,LmP >Q.  
 data.uID=98; ~0?B  
 Shell_NotifyIcon(NIM_DELETE,&data); 6mIK[Qnp  
 ShowWindow(SW_SHOW); d:#tN4y7(  
 SetForegroundWindow(); cJTwgm?  
 ShowWindow(SW_SHOWNORMAL);  tL<.B  
 bTray=FALSE; w $`w  
} ^7=7V0>,:  
E2>+V{TF  
void CCaptureDlg::OnChange() \.Op6ECV9  
{ "{t]~urLd  
 RegisterHotkey(); x5/&,&m`%  
} /s=veiH  
~ ^   
BOOL CCaptureDlg::RegisterHotkey() [/n@BK  
{ A%^7D.j  
 UpdateData(); }owl7G3  
 UCHAR mask=0; *BF[thB:a  
 UCHAR key=0; 'lu3BQvfh  
 if(m_bControl) )Z['=+s%  
  mask|=4; _G25$%/LU  
 if(m_bAlt) Un T\6u  
  mask|=2; r=54@`O!  
 if(m_bShift) SR?(z  
  mask|=1; u-mD"  
  key=Key_Table[m_Key.GetCurSel()]; kBoQjOV`  
 if(bRegistered){ $p$p C/:%  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); iJmzVR+  
  bRegistered=FALSE; MPw?HpM  
 } B##X94aTT  
 cMask=mask; Z;RUxe|<k  
 cKey=key; V RD^>Gi  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); MHye!T6fO\  
 return bRegistered; 2\gIjXX"  
} ?N!kYTR%}  
~#}T|  
  四、小结 b`=g#B|  
WBm)Q#1:  
  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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