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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: 5=9gH  
  E>w|i  
  一、实现方法 =YeI,KbA)  
`#>JRQ=  
  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: \>(S?)6  
$_b^p=  
#pragma data_seg("shareddata") R9O[`~BA2  
HHOOK hHook =NULL; //钩子句柄 il >XV>  
UINT nHookCount =0; //挂接的程序数目 rklK=W z  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 b2HHoIT  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 C4 @"@kbr  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey hYv;*]  
static int KeyCount =0; bB"q0{9G-  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 qlIbnyP<  
#pragma data_seg() 50^T \u  
iJ 8I# j+N  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 3hbUus  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: b1frAA  
^+q4*X6VB  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Z<n%~z^  
cKey,UCHAR cMask) <%Afa#  
{ y|[YEY U)  
 BOOL bAdded=FALSE; L'$;;eM4  
 for(int index=0;index<MAX_KEY;index++){ rH5'+x K  
  if(hCallWnd[index]==0){ CHNIL^B  
   hCallWnd[index]=hWnd; </7_T<He.  
   HotKey[index]=cKey; ^ G@o} Z  
   HotKeyMask[index]=cMask; ZsepTtY  
   bAdded=TRUE; f1}b;JJTsv  
   KeyCount++; #\r5Q>  
   break; XoqmT/P  
  } ?^W`7HF%0  
 } 0w<qj T^U  
 return bAdded; xlU:&=|  
} =}Xw}X+[WY  
//删除热键 xyc`p[n &  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %)@3V8OI  
{ ^=gzm s  
 BOOL bRemoved=FALSE; ?q+^U>wy&  
 for(int index=0;index<MAX_KEY;index++){ TWAt)Q"J  
  if(hCallWnd[index]==hWnd){ ^Q""N<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ BA cnFO  
    hCallWnd[index]=NULL; $Hbd:1%i {  
    HotKey[index]=0; VA0p1AD  
    HotKeyMask[index]=0; [^GXHE=  
    bRemoved=TRUE; Ve\=By-a|  
    KeyCount--; 1 !`B8y)  
    break; 4Hcds9y9  
   } mzh7E[S_,i  
  } Wo8.tu-2  
 } Zfub+A  
 return bRemoved; hh ynB^o  
} +_E 96`P  
tOf18V{a  
R2!_)Rpf  
  DLL中的钩子函数如下: NA9N#;  
5fVm392+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) #K _E/~  
{ zM*PN|/%sH  
 BOOL bProcessed=FALSE; CH3bpZv  
 if(HC_ACTION==nCode) h|S6LgB  
 { _/ Uer }  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 [j^c&}0  
   switch(wParam) _ BUD~'Q5  
   {  qD/X%`>Q  
    case VK_MENU: .B|a.-oA4  
     MaskBits&=~ALTBIT; M<"H1>q@  
     break; e[AwR?=  
    case VK_CONTROL: xfJ&11fG2  
     MaskBits&=~CTRLBIT; K{#1O=Gi  
     break; I3$/ #  
    case VK_SHIFT: C~#ndl Ij  
     MaskBits&=~SHIFTBIT; :ncR7:Z  
     break;  y+.E}  
    default: //judge the key and send message yJ!x`RD),w  
     break; )RE~=*?d  
   } 't:s6  
   for(int index=0;index<MAX_KEY;index++){ w~I;4p~(N  
    if(hCallWnd[index]==NULL) w` ;>+_ E7  
     continue; Jg\1(ix  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /,cyp .  
    { AD/7k3:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~56F<=#,  
     bProcessed=TRUE; jWL;ElM'  
    } 'z.: e+Q_  
   } C-6m[W8S  
  } 4RXF.kJ3=  
  else if((lParam&0xc000ffff)==1){ //有键按下 6EeK5XLf,  
   switch(wParam) tQ > IJ  
   { A(<"oAe|  
    case VK_MENU: AJ`R2 $  
     MaskBits|=ALTBIT; |?KdQeL  
     break; 540,A,>:tb  
    case VK_CONTROL: | N/Wu9w$  
     MaskBits|=CTRLBIT; v%6mH6V  
     break; :n t\uwh  
    case VK_SHIFT: g9$P J:  
     MaskBits|=SHIFTBIT; |zaYIVE[  
     break; e//q`?ys  
    default: //judge the key and send message ,\cO>y@  
     break; `aw5"ns^V  
   } YPY'[j(p`n  
   for(int index=0;index<MAX_KEY;index++){ b=-LQkcZhK  
    if(hCallWnd[index]==NULL) iB=v >8l%  
     continue; <h"*"q|9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uNcE_<  
    { lh?TEQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); r{~@hd'Aj  
     bProcessed=TRUE; -P5M(Rt  
    } O%n=n3  
   } DKGZm<G>  
  } 9:l@8^_o  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 R6KS&Ge_  
   for(int index=0;index<MAX_KEY;index++){ ==z,vxr  
    if(hCallWnd[index]==NULL) ;:)?@IuSy  
     continue; JG=U@I]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) h+rrmC  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); e%O]U:Z  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 0,x<@.pW  
   } EN!Q]O|  
  } :',Q6j(s  
 } ~dO&e=6Hk  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); z2GT9  
} MCcWRbE5#  
,n &e,I  
  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: `?PpzDV7Y  
%bs~%6)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9J!@,Zsh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5U3 b&0  
QNzx(IV@  
  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: JZS#Q\JN  
%`~? w'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  HSR^R  
{ ayb fBC  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Dm.tYG  
 { =H\ig%%E@  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 =!RlU)w  
  SaveBmp(); ct3^V M&/  
  return FALSE; =h{j F7  
 } X!w&ib-  
 …… //其它处理及默认处理 c G`R\ $  
} du:%{4  
JN Ur?+g  
k^ZcgHHgb  
  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。 nd 5w|83  
~e)`D nJ  
  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。 50S >`qi2x  
=n}+p>\s  
  二、编程步骤 u=5~^ 9  
%Z"I=;=nxI  
  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"; +$YluGEJ  
#(5hV7i  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; u\JYxNj1  
eI 6G  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; qrj:H4#VB  
%z_PEqRj  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; fs=W(~"  
:]viLw\&g  
  5、 添加代码,编译运行程序。 j(;o   
_qPd)V6yb  
三、程序代码 ^j1WF[GiSO  
BZP~m=kq  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL m'Thm{Y,?n  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) gUcG#  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ r3hUa4^97  
#if _MSC_VER > 1000 MMI7FlfY  
#pragma once iA^GA8dn  
#endif // _MSC_VER > 1000 XA$Z 7_gu3  
#ifndef __AFXWIN_H__ >c~ Fg s  
#error include 'stdafx.h' before including this file for PCH lAM"l)Ij  
#endif Of*z9 YI  
#include "resource.h" // main symbols wd/"! A4(  
class CHookApp : public CWinApp 5GP,J,J  
{ h zh%ML3L  
 public: wjr1?c  
  CHookApp(); ]y3'6!  
  // Overrides 6uU2+I  
  // ClassWizard generated virtual function overrides -<'&"-  
  //{{AFX_VIRTUAL(CHookApp) > 4zH\T!  
 public: #_, l7q8U  
  virtual BOOL InitInstance(); *W#_W]Tu  
  virtual int ExitInstance(); nEZo F  
  //}}AFX_VIRTUAL ^E5[~C*o3  
  //{{AFX_MSG(CHookApp) jG0o-x=X  
  // NOTE - the ClassWizard will add and remove member functions here. rdFeDZo&Z)  
  // DO NOT EDIT what you see in these blocks of generated code ! jtMN)TM  
  //}}AFX_MSG "Zh6j)[o  
  DECLARE_MESSAGE_MAP() c&Mci"n j0  
}; d0`5zd@S  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); pm*6&,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +{$NN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); FK$?8Jp  
BOOL InitHotkey(); &s|&cT  
BOOL UnInit(); .[ Z<r>  
#endif %U.aRSf/  
\eD{bD  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. "v"w ER?  
#include "stdafx.h" 483BrFV  
#include "hook.h" U-P\F-  
#include <windowsx.h> gUo L8~  
#ifdef _DEBUG j&G*$/lTO6  
#define new DEBUG_NEW 5df~] -=0Y  
#undef THIS_FILE {~"&$DY2  
static char THIS_FILE[] = __FILE__; 7h4"5GlO0  
#endif 03iD(,@  
#define MAX_KEY 100 * 7ki$f!  
#define CTRLBIT 0x04 RaS7IL:e  
#define ALTBIT 0x02 | 'SqG}h  
#define SHIFTBIT 0x01 uKI2KWU?2  
#pragma data_seg("shareddata") 6QCU:2IiL  
HHOOK hHook =NULL; BCE} Er&  
UINT nHookCount =0; KT)A{i  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey (Ut)APM  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT .{-&3++WZ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey +$eEZ;4  
static int KeyCount =0; X676*;:!.  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift -`mHb  
#pragma data_seg() PKT/U^2X]  
HINSTANCE hins; (W7cQ>  
void VerifyWindow();  $)5F3 a|  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) L{hP&8$k  
//{{AFX_MSG_MAP(CHookApp) 7>g^OE f  
// NOTE - the ClassWizard will add and remove mapping macros here. _?M71>3$.  
// DO NOT EDIT what you see in these blocks of generated code! s uT#k3  
//}}AFX_MSG_MAP ?#8s=t  
END_MESSAGE_MAP() 'g8~uP  
I e#LZti  
CHookApp::CHookApp() W2F %E  
{ 26Y Y1T\B)  
 // TODO: add construction code here, `&.]>H)N*  
 // Place all significant initialization in InitInstance AeqxH1%  
} -?A,N,nnX  
2d,q?VH$  
CHookApp theApp; je^!W?U4<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ,&II4;F  
{ !<wM?Q:  
 BOOL bProcessed=FALSE; hhTM-D1Ehs  
 if(HC_ACTION==nCode) =R08B)yR  
 { Rw$>()}H8  
  if((lParam&0xc0000000)==0xc0000000){// Key up aj1o   
   switch(wParam) >Lh+(M;+F  
   { F[Dhj,C"  
    case VK_MENU: .=WsB@+   
     MaskBits&=~ALTBIT; KJ Gh)  
     break; SBnwlM"AN  
    case VK_CONTROL: 0ciPH:V  
     MaskBits&=~CTRLBIT; kKV`9&dZe  
     break; wG1A]OJl1  
    case VK_SHIFT: kI>Iq Q-h  
     MaskBits&=~SHIFTBIT; @$R[Js%MuO  
     break; 9rr"q5[  
    default: //judge the key and send message dMAd-q5{  
     break; C.r9)#G  
   } "#T3l^@  
   for(int index=0;index<MAX_KEY;index++){ 1C[j:Ly/  
    if(hCallWnd[index]==NULL) uTN mt]  
     continue; r-#23iT.~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f)xHSF"  
    { gDP\u<2!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); KGCm@oy  
     bProcessed=TRUE; 2TN+ (B#Z!  
    } k<xiP@b{y  
   } 4{Vw30DZ  
  } ,t4g^67R{  
  else if((lParam&0xc000ffff)==1){ //Key down Sri,sZv  
   switch(wParam) 7/.-dfEK  
   { <<@vy{*Hg  
    case VK_MENU: eMPk k=V  
     MaskBits|=ALTBIT; gl/n*s#r_  
     break; b?#k  
    case VK_CONTROL: S ^?&a5{o  
     MaskBits|=CTRLBIT; 8y!d^EQ  
     break; 0*66m:C2  
    case VK_SHIFT: KmoPFlw  
     MaskBits|=SHIFTBIT; Xg |_  
     break; s 2t'jIB  
    default: //judge the key and send message .6Swc?  
     break; &8R%W"<K  
   } g{&a|NU^  
   for(int index=0;index<MAX_KEY;index++) H\tz"<*``  
   { GdFTKOq  
    if(hCallWnd[index]==NULL) "]}+QK_  
     continue; -ec ~~95  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Las4ux[_  
    { B;A^5~b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ][8ZeM9&p  
     bProcessed=TRUE; =;.#Bds  
    } eW$G1h:  
   } X4emhB  
  } ,Mf@I5?  
  if(!bProcessed){ [gZd$9a  
   for(int index=0;index<MAX_KEY;index++){ 9Ny{2m=Ye  
    if(hCallWnd[index]==NULL) i]{M G'tg  
     continue; =/@c9QaV B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) sidSY8j  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ar.w'z  
   } 7dl]f#uZU  
  } JV|GE n\@N  
 } ^E&':6(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); FHVZ/ e  
} "R-1 G/  
yBKkx@o#z  
BOOL InitHotkey() M IPmsEdBi  
{ "|{O%X  
 if(hHook!=NULL){ pqPhtWi%PJ  
  nHookCount++; xX l^\?HC  
  return TRUE; k36%n *4  
 } >&h#t7<  
 else K29]B~0%E  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 4C2JyP3  
  if(hHook!=NULL) ^|DI9G(Bs  
   nHookCount++; ($^XF:#5  
  return (hHook!=NULL); RG=!,#X  
} g+gHIb7{  
BOOL UnInit() (q+U5Ls6  
{ 0eY$K7 U  
 if(nHookCount>1){ *V(TNLIh;  
  nHookCount--; LGq}wxq  
  return TRUE; EJP##eGx  
 } olzP=08aaV  
 BOOL unhooked = UnhookWindowsHookEx(hHook); I^'kt[P'FZ  
 if(unhooked==TRUE){ 'ypJGm  
  nHookCount=0; SS@F:5),  
  hHook=NULL; 4CO:*qG)o  
 } (9x8,f0z  
 return unhooked; CW>f;  
} {.2A+JT,  
n|F$qV_p\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) HqXaT6#/  
{ b]hP;QK`U$  
 BOOL bAdded=FALSE; 2`,{IHu*!  
 for(int index=0;index<MAX_KEY;index++){ 0IoS|P}6a  
  if(hCallWnd[index]==0){ IH?.s k  
   hCallWnd[index]=hWnd; _@0>y MZ^  
   HotKey[index]=cKey; ou6|;*>d  
   HotKeyMask[index]=cMask; IbAGnl{  
   bAdded=TRUE; $-9m8}U(Y  
   KeyCount++; )`]w\s #  
   break; UPgjf  
  } R iid,n  
 } IGs!SXclCs  
 return bAdded; C,:3z  
} ('!90  
c,;-[sn  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) z-nhL=  
{ S5]rIcM  
 BOOL bRemoved=FALSE; . Rxz;-VA  
 for(int index=0;index<MAX_KEY;index++){ FCU~*c8Cs  
  if(hCallWnd[index]==hWnd){ dL5u-<y&  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ; 1K[N0xE  
    hCallWnd[index]=NULL; 'bj$ZM9  
    HotKey[index]=0; OpmI" 4{+  
    HotKeyMask[index]=0; X<J NwjM%  
    bRemoved=TRUE; FQSepUl  
    KeyCount--; )y-y-B=+T  
    break; v0`E lkaN  
   } hp6S *d  
  } /m%Y.:g  
 } 1cWUPVQ  
 return bRemoved; D 4^2F(YRX  
} hh`7b,+ 4  
?fcQd6-}  
void VerifyWindow() 5'gV_U  
{ 4' bup h1(  
 for(int i=0;i<MAX_KEY;i++){ \M1-  
  if(hCallWnd!=NULL){ 0}jB/Z_T  
   if(!IsWindow(hCallWnd)){ DWZ!B7Ts  
    hCallWnd=NULL; q?'*T?|  
    HotKey=0; !Y/$I?13Z  
    HotKeyMask=0; !q!.OQ  
    KeyCount--; 1t/#ZT!X/  
   } O#fGHI<43[  
  } X2!vC!4P?L  
 } 5F$ elW  
} \gy39xoW(  
GQO}E@W6C  
BOOL CHookApp::InitInstance() .0;Z:x_3  
{ MHJH@$|]  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); JSQNx2VqQ  
 hins=AfxGetInstanceHandle(); [5^"U+`{x  
 InitHotkey(); ;_)&#X,?(  
 return CWinApp::InitInstance(); #:v}d+  
} JX@/rXFY}  
37Vs9w  
int CHookApp::ExitInstance() `~QS3zq  
{ PvX>+y5  
 VerifyWindow(); sF}T9 Ue  
 UnInit(); _M= \s>;G  
 return CWinApp::ExitInstance(); dX-Xzg  
} 82Dw,Cn  
%JmSCjt`G  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file z/aZD\[_  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) !_)*L+7f_  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ n#,|C`2r  
#if _MSC_VER > 1000 1foy.3g-  
#pragma once .<j\"X(  
#endif // _MSC_VER > 1000 x\!Q[  
b&X- &F  
class CCaptureDlg : public CDialog /<)A!Nn+F  
{ `WSm/4 m  
 // Construction |13UJ vR  
 public: @#$5_uU8\(  
  BOOL bTray; a,IE;5kG  
  BOOL bRegistered; uFNVV;~RFI  
  BOOL RegisterHotkey(); gtWJR  
  UCHAR cKey; 3G|n`dj  
  UCHAR cMask; GV'Y'  
  void DeleteIcon(); vK z/-9im  
  void AddIcon(); mnswG vY  
  UINT nCount; ,cD(s(6+  
  void SaveBmp(); > f,G3Ay  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor =m6;]16D  
  // Dialog Data z6#~B&  
  //{{AFX_DATA(CCaptureDlg) nE#p Ry]  
  enum { IDD = IDD_CAPTURE_DIALOG }; gnF]m0LR  
  CComboBox m_Key; ^c" wgRHc<  
  BOOL m_bControl; `Et)@{iP  
  BOOL m_bAlt; { [ QCuR  
  BOOL m_bShift; zts%oIgV  
  CString m_Path; d-w#\ ^  
  CString m_Number; +]P? ?`,R;  
  //}}AFX_DATA 1>bG]l1//  
  // ClassWizard generated virtual function overrides F1%-IBe  
  //{{AFX_VIRTUAL(CCaptureDlg) OI</o0Ca  
 public: 1TeYA6 t  
  virtual BOOL PreTranslateMessage(MSG* pMsg); )e`$'y@L$  
 protected: Xl^=&!S>me  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support raRb K8CQ  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); WrBiAh,  
  //}}AFX_VIRTUAL NrPs :`  
  // Implementation 3(l^{YC+[7  
 protected: y6tzmyg  
  HICON m_hIcon; ;2 -%IA,  
  // Generated message map functions ;L(2Ffk8  
  //{{AFX_MSG(CCaptureDlg) |%.V{vgP7  
  virtual BOOL OnInitDialog(); .jW+\mIX  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam);  K9 h{sC  
  afx_msg void OnPaint(); IF-g %  
  afx_msg HCURSOR OnQueryDragIcon(); wd&Tf R4!  
  virtual void OnCancel(); ew8f7S[  
  afx_msg void OnAbout(); udYk 6  
  afx_msg void OnBrowse(); +Zgh[a  
  afx_msg void OnChange(); R: 8\z0"L*  
 //}}AFX_MSG [O92JT:li  
 DECLARE_MESSAGE_MAP() | wuUH  
}; *CG-F=  
#endif W,'30:#Fr7  
j}~3m$  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Ao>] ~r0  
#include "stdafx.h" i|A0G%m]$  
#include "Capture.h" x%HX0= (  
#include "CaptureDlg.h" CPGiKE  
#include <windowsx.h> 5lehASBz  
#pragma comment(lib,"hook.lib") Fy_D[g  
#ifdef _DEBUG kpFt  
#define new DEBUG_NEW vqDd][n  
#undef THIS_FILE ";\na!MT  
static char THIS_FILE[] = __FILE__; 5{ ?J5  
#endif {z:aZ]QhKc  
#define IDM_SHELL WM_USER+1 T;jy2|mLo  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); n@IpO i$Q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'o41)p  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; c!n\?lB  
class CAboutDlg : public CDialog T 2Uu/^  
{ z&x ^ Dl  
 public: 6 2{(i'K  
  CAboutDlg(); \D Oqx  
  // Dialog Data .;#Wf @V  
  //{{AFX_DATA(CAboutDlg) @T>\pP]o  
  enum { IDD = IDD_ABOUTBOX }; >S\D+1PV  
  //}}AFX_DATA fX"cQ&  
  // ClassWizard generated virtual function overrides %dA6vHI,  
  //{{AFX_VIRTUAL(CAboutDlg) aYc*v5Q N3  
 protected: ft$@':F  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 'a8{YT4  
  //}}AFX_VIRTUAL Fo  K!JX*  
  // Implementation X.^S@3[  
 protected: >9F&x>~  
  //{{AFX_MSG(CAboutDlg) UbDRzum  
  //}}AFX_MSG $2lrP]`>j.  
  DECLARE_MESSAGE_MAP() 4O}ZnE1[  
}; t.0F  
^lADq']  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) x z5 V.  
{ XNODDH   
 //{{AFX_DATA_INIT(CAboutDlg) `<}Q4p  
 //}}AFX_DATA_INIT _`'VOY`o  
} Wx~N1+  
/{h@A~<96  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) /1A3 Sw  
{ PtP{_9%Dz  
 CDialog::DoDataExchange(pDX); 2Fwp\I;  
 //{{AFX_DATA_MAP(CAboutDlg) NF9fPAF%;  
 //}}AFX_DATA_MAP [=f(u wY>g  
} O"%b@$p\L  
,+LX.f&/8!  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4}C^s\?z  
 //{{AFX_MSG_MAP(CAboutDlg) ,|:TML  
 // No message handlers `v;9!ReZV  
 //}}AFX_MSG_MAP ,ddoII  
END_MESSAGE_MAP() ;h|zNx0  
!h\>[O  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) v[-.]b*5A$  
: CDialog(CCaptureDlg::IDD, pParent) tb#9TF  
{ LBO3){=J  
 //{{AFX_DATA_INIT(CCaptureDlg) cOz8YVR-  
  m_bControl = FALSE; yDmNPk/  
  m_bAlt = FALSE; `XT8}9z!  
  m_bShift = FALSE; ANqWY &f  
  m_Path = _T("c:\\"); 5%`fh%  
  m_Number = _T("0 picture captured."); e+`LtEve0  
  nCount=0; {w/{)B nPG  
  bRegistered=FALSE; 8OV;&Z,x  
  bTray=FALSE; j6Msbq[  
 //}}AFX_DATA_INIT #kho[`9  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 OPi><8x  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 2L\}  
} g7Xjo )  
DcjF $E  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Q&Q$;s3|Y  
{ TU-aL  
 CDialog::DoDataExchange(pDX); . #+N?D<  
 //{{AFX_DATA_MAP(CCaptureDlg) }K<% h  
  DDX_Control(pDX, IDC_KEY, m_Key); ..Q$q2.  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); )1E[CIaXK  
  DDX_Check(pDX, IDC_ALT, m_bAlt); \W%Aeg*c  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); cOhx  
  DDX_Text(pDX, IDC_PATH, m_Path); "#<P--E9  
  DDX_Text(pDX, IDC_NUMBER, m_Number); k&oq6!ix  
 //}}AFX_DATA_MAP _f^JXd,7v  
} }vx+/J  
fLGZ@-qA0  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) pv LA:LW2  
//{{AFX_MSG_MAP(CCaptureDlg) ^v5v7\!  
 ON_WM_SYSCOMMAND() P|0dZHpT  
 ON_WM_PAINT() WR5@S&fU`  
 ON_WM_QUERYDRAGICON() $9~6M*  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) H YA<  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) kK62yz,  
 ON_BN_CLICKED(ID_CHANGE, OnChange) <in#_Of {E  
//}}AFX_MSG_MAP ]x;*Z&  
END_MESSAGE_MAP() =I(F(AE  
VaV(+X  
BOOL CCaptureDlg::OnInitDialog() |+-D@22 y  
{ 9V]{q  
 CDialog::OnInitDialog(); Vn7FbaO^  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); E2hy%y9Tp  
 ASSERT(IDM_ABOUTBOX < 0xF000); NA=I7I@  
 CMenu* pSysMenu = GetSystemMenu(FALSE); !PAuMj)P  
 if (pSysMenu != NULL) utH/E7^8  
 { F=T};b  
  CString strAboutMenu; seNJ6p=`  
  strAboutMenu.LoadString(IDS_ABOUTBOX); +1uAzm4SL  
  if (!strAboutMenu.IsEmpty()) \E}YtN#  
  { }3%L3v&  
   pSysMenu->AppendMenu(MF_SEPARATOR); QGC%, F"+  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Un~ }M/  
  } >^fpQG  
 } `jI$>{oa  
 SetIcon(m_hIcon, TRUE); // Set big icon +mgm39  
 SetIcon(m_hIcon, FALSE); // Set small icon Es7+bFvsE8  
 m_Key.SetCurSel(0); f!H~BMA+a  
 RegisterHotkey(); w!GPPW(  
 CMenu* pMenu=GetSystemMenu(FALSE); )qbjX{GZ7  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -gq,^j5,  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); |(evDS5  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); N*B_ or  
 return TRUE; // return TRUE unless you set the focus to a control b$*1!a  
} G C#s;X  
#8{U0 7]"  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [9-&Lq_ g  
{ T_=IH~"  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) SJ ay  
 { t_Q\uo}  
  CAboutDlg dlgAbout; ~_XK<}SK  
  dlgAbout.DoModal(); ^yl)c \`  
 } d?9b6k?  
 else Hv3<gyD  
 { ;Z asK0  
  CDialog::OnSysCommand(nID, lParam); y;$ !J  
 } j0X Jf<  
} u#Z#NP ~F0  
Z<Rhn  
void CCaptureDlg::OnPaint() u`ezQvrcy  
{ o*r 2T4 8  
 if (IsIconic()) "/#=8_f  
 { .)Wqo7/Gx  
  CPaintDC dc(this); // device context for painting bE6:pGr  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); -zSkon2Y^  
  // Center icon in client rectangle 'zUWO_(  
  int cxIcon = GetSystemMetrics(SM_CXICON); fzk^QrB  
  int cyIcon = GetSystemMetrics(SM_CYICON); ]b+Nsr~  
  CRect rect; Szb#:C  
  GetClientRect(&rect); h!zev~u1)`  
  int x = (rect.Width() - cxIcon + 1) / 2; SNUq  
  int y = (rect.Height() - cyIcon + 1) / 2; F\Z|JCA  
  // Draw the icon SQS PdR+  
  dc.DrawIcon(x, y, m_hIcon); VfFXH,j  
 } flXDGoW  
 else 8*7,qX  
 { l5/!0]/  
  CDialog::OnPaint(); 9&O7F}VP2  
 } x("V +y*  
} 1SwKd*aRR?  
phc9esz  
HCURSOR CCaptureDlg::OnQueryDragIcon() JNx;/6'd,  
{ 3~ptD5@WF  
 return (HCURSOR) m_hIcon; nf2[hx@=U  
} $xK*TJ(k  
=-dg]Ol8  
void CCaptureDlg::OnCancel() l |Y?]LNr  
{ 9sId2py]W  
 if(bTray) Z`jSpgWR  
  DeleteIcon(); VUQx"R9-  
  CDialog::OnCancel(); "3Lq/mJYnZ  
} OMz_xm.UPi  
QI WfGVc-  
void CCaptureDlg::OnAbout() EyK F5TP0  
{ Ia%S=xU{=  
 CAboutDlg dlg; 9e _8Z@|  
 dlg.DoModal(); 1Y6DzWI  
} fgW>~m.W  
Yp@i{$IUW  
void CCaptureDlg::OnBrowse() `iQ9 9  
{ [+2iwfD  
 CString str; M/LC:,  
 BROWSEINFO bi; 5<RZ ht$i  
 char name[MAX_PATH]; Fu$JI8  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); huTWoMU  
 bi.hwndOwner=GetSafeHwnd(); n]< >$  
 bi.pszDisplayName=name; Xf/qUao  
 bi.lpszTitle="Select folder"; _Z0O]>KH  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; tXg>R _\C  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); L Rn)  
 if(idl==NULL) p3W-*lE  
  return; C8bB OC(  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); iAn]hVW  
 str.ReleaseBuffer(); %h^ f?.(:  
 m_Path=str; 6^#@y|.  
 if(str.GetAt(str.GetLength()-1)!='\\') o'*7I|7a  
  m_Path+="\\"; g?1! /+  
 UpdateData(FALSE); wyC1M  
} ?rSm6V  
6)#=@i` \  
void CCaptureDlg::SaveBmp() [6}>?  
{ #bZT&YE^  
 CDC dc; H"vy[/UcR  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 6_zyPh  
 CBitmap bm; .% {4B,d$  
 int Width=GetSystemMetrics(SM_CXSCREEN); 0w9[Z  
 int Height=GetSystemMetrics(SM_CYSCREEN); Og E<bw  
 bm.CreateCompatibleBitmap(&dc,Width,Height); vNIQ1x5Za  
 CDC tdc; YCI- p p  
 tdc.CreateCompatibleDC(&dc); Pgo^$xn'6  
 CBitmap*pOld=tdc.SelectObject(&bm); V 3yt{3Or  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Jr.4Y>;}e3  
 tdc.SelectObject(pOld); LR:meCOI  
 BITMAP btm; &Z%|H>+;T  
 bm.GetBitmap(&btm); tjWf`#tH>H  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; oRZ--1oR_  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); IM8lA  
 BITMAPINFOHEADER bih; RS9mAeX4h  
 bih.biBitCount=btm.bmBitsPixel; Bf+7;4-  
 bih.biClrImportant=0; svj0;x5  
 bih.biClrUsed=0; u~7 ,v  
 bih.biCompression=0; rL3 f%L  
 bih.biHeight=btm.bmHeight; M # ) @!  
 bih.biPlanes=1; .j l|? o  
 bih.biSize=sizeof(BITMAPINFOHEADER); tMOhH #  
 bih.biSizeImage=size; i286`SLU  
 bih.biWidth=btm.bmWidth; SMIr@*R  
 bih.biXPelsPerMeter=0; u0?,CQPL  
 bih.biYPelsPerMeter=0; t(Sjo8, b  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); =1e>$E#  
 static int filecount=0; Y-y<gW  
 CString name; oJln"-M1nx  
 name.Format("pict%04d.bmp",filecount++); dHJ#xmE!pP  
 name=m_Path+name; *)0-N!N#)  
 BITMAPFILEHEADER bfh; J<27w3bs~p  
 bfh.bfReserved1=bfh.bfReserved2=0; 79G& 0 P\  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 6ntduXeNVh  
 bfh.bfSize=54+size; ]zUvs6ksLG  
 bfh.bfOffBits=54; TBr@F|RXiO  
 CFile bf; (N/KP+J$n  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ o3kVcX^  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); e>~7RN  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Puodsd  
  bf.WriteHuge(lpData,size); @p$$BUb  
  bf.Close(); ?o883!&v  
  nCount++; Api<q2@R  
 }  /gUD!@  
 GlobalFreePtr(lpData); T/Fj0'  
 if(nCount==1) ;lU]ilYv  
  m_Number.Format("%d picture captured.",nCount); IuN:*P  
 else 0.kQqy~5  
  m_Number.Format("%d pictures captured.",nCount);  _YPu  
  UpdateData(FALSE); KoF_G[m  
} HCOE'24I  
Bq*aP*jv  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ,o68xfdZVW  
{ [_w;=l0 ;  
 if(pMsg -> message == WM_KEYDOWN) uX8yS|= *  
 { ]s<}'&  
  if(pMsg -> wParam == VK_ESCAPE) na-mh E,H  
   return TRUE; p6|RV(?8  
  if(pMsg -> wParam == VK_RETURN) p8_ CY[U  
   return TRUE; y~-dQ7r  
 } Yj#4{2A  
 return CDialog::PreTranslateMessage(pMsg); 2oFbS%OV  
} o5`LLVif5y  
= k7}[!T  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) TL*8h7.(  
{ oJ`cefcWo  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ G}ccf%  
  SaveBmp(); j c-$l  
  return FALSE; 8AQ@?\Rc"2  
} vAH`tPi>  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ R\^XF8n6/  
 CMenu pop; ml\2%07  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ,,o5hD0V9  
 CMenu*pMenu=pop.GetSubMenu(0); MbJ|6g99  
 pMenu->SetDefaultItem(ID_EXITICON); ,bnrVa(I  
 CPoint pt; Uh=@8v  
 GetCursorPos(&pt); zM+eb| >cr  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); '%\FT-{  
 if(id==ID_EXITICON) Yj/[I\I"m  
  DeleteIcon(); d@IV@'Q7u  
 else if(id==ID_EXIT) ae-hQF&  
  OnCancel(); i3v|r 0O~L  
 return FALSE; TF7~eyLg  
} REc+@;B  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); R}J}Q b  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ),;O3:n  
 AddIcon(); zd-qQ.j0  
 return res; (yxHXO9N  
} %SJ2W>e  
@b5zHXF83E  
void CCaptureDlg::AddIcon() .M zAkZ=  
{ W v4o:_}  
 NOTIFYICONDATA data; ]UFbG40Zo  
 data.cbSize=sizeof(NOTIFYICONDATA); WO<a^g {  
 CString tip; m\xlSNW'q  
 tip.LoadString(IDS_ICONTIP); s6+`cC4  
 data.hIcon=GetIcon(0); ro`2IE>  
 data.hWnd=GetSafeHwnd(); -lDAxp6p  
 strcpy(data.szTip,tip); uqFYa bU  
 data.uCallbackMessage=IDM_SHELL; bz4TbGg]  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; {j!+\neL  
 data.uID=98; qrxn%#\XP  
 Shell_NotifyIcon(NIM_ADD,&data); oasEG6OI8  
 ShowWindow(SW_HIDE); Eu)(@,]we  
 bTray=TRUE; 3rh@|fg)E  
} [t}\8^y  
" _{o}8L  
void CCaptureDlg::DeleteIcon() OD~B2MpM>  
{ ##_Jz5P  
 NOTIFYICONDATA data; 6L4<c+v_  
 data.cbSize=sizeof(NOTIFYICONDATA); B?pNF+?'z  
 data.hWnd=GetSafeHwnd(); T**v!Ls  
 data.uID=98; 4Ow0g-{  
 Shell_NotifyIcon(NIM_DELETE,&data); IqrT@jgN-  
 ShowWindow(SW_SHOW); Z:3SI$tO  
 SetForegroundWindow(); Ptj[9R  
 ShowWindow(SW_SHOWNORMAL); rmh 1.W  
 bTray=FALSE; wM aqR"%  
} Htn''adg5  
i?0+f }5<p  
void CCaptureDlg::OnChange() k/]4L!/ T  
{ ] lONi  
 RegisterHotkey(); e|2@z-Sp-  
} RP|/rd]-k  
\[yg f6#[  
BOOL CCaptureDlg::RegisterHotkey() DLBHZ?+!  
{ C0v1x=(xiM  
 UpdateData(); (#?k|e"Y"`  
 UCHAR mask=0; X+LG Z4]D  
 UCHAR key=0; R m^$Dn  
 if(m_bControl) YOE!+MiO  
  mask|=4; S%{^@L+V  
 if(m_bAlt) |ryV7VJ8  
  mask|=2; <A+n[h  
 if(m_bShift) W3aFao>!OZ  
  mask|=1; *47',Qy  
  key=Key_Table[m_Key.GetCurSel()]; W _JGJV.^f  
 if(bRegistered){ _ 0g\g~[  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); >A_:q yGk  
  bRegistered=FALSE; 1 |T{RY5  
 } jPc"qER!  
 cMask=mask; eF=cMC  
 cKey=key; IVdM}"+  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 9hn+eU  
 return bRegistered; ExKjH*gn  
} 8DLj?M>N  
5%)<e-  
  四、小结 HmQ.'  
Z\. n6  
  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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