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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: zq Cr'$  
  fG" 4\A  
  一、实现方法 yc7 "tptfF  
INNTp[  
  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: WQ1K8B4  
VJbn/5+P  
#pragma data_seg("shareddata") O5v~wLx9e  
HHOOK hHook =NULL; //钩子句柄 1$n!Lj=5  
UINT nHookCount =0; //挂接的程序数目 os[i  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 c~)H" n  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 3gQ2wP*K  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey #,S0uA  
static int KeyCount =0; =`EVg>+^  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 &BOG&ot  
#pragma data_seg() } $oZZKS  
\R.Fmeko  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ,<O|#`?"@G  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: z{ (c-7*  
M?v`C>j  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR fO{'$?K  
cKey,UCHAR cMask) s*tzU.E (  
{ fq(3uE]nC  
 BOOL bAdded=FALSE; g0 k{b  
 for(int index=0;index<MAX_KEY;index++){ rd ]dD G  
  if(hCallWnd[index]==0){ 2#_ i_j  
   hCallWnd[index]=hWnd; 7Um3m yXU  
   HotKey[index]=cKey; HV[*=Qi  
   HotKeyMask[index]=cMask; [&5%$ T  
   bAdded=TRUE; {(5M)|>  
   KeyCount++; RD6`b_]o  
   break; 83pXj=k<  
  } |IZFWZd  
 } um=qT)/D  
 return bAdded; |>dqZ_)v  
} H|8i|vbi  
//删除热键 GmdS~Fhp  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ia*Bcx_RW+  
{ tD+K4 ^  
 BOOL bRemoved=FALSE; =SK{|fBB  
 for(int index=0;index<MAX_KEY;index++){ *kq>Z 06'i  
  if(hCallWnd[index]==hWnd){ &\5%C\0Z<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ A)HV#T`N  
    hCallWnd[index]=NULL; ;@/vKA3l.  
    HotKey[index]=0; iu+rg(*%  
    HotKeyMask[index]=0; D8=a+!l-  
    bRemoved=TRUE; PS/00F/Ak  
    KeyCount--; FQBAt0  
    break; ~+&Z4CYb  
   } QN8.FiiD  
  } 9V?:!%J  
 } ,K8(D<{  
 return bRemoved; =P`l+k3  
} yr q){W  
+<7a$/L?4  
lQt* LWd[  
  DLL中的钩子函数如下: (R^Ca7F  
A08{]E#v>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) m ol|E={si  
{ 9D H}6fO  
 BOOL bProcessed=FALSE; R zn%!d^$>  
 if(HC_ACTION==nCode) !^IAn  
 { x`Ik747^v  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 o]WG8Mo-  
   switch(wParam) X@^"@  
   {  N6uKFQL:{  
    case VK_MENU: 4L/8Hj#g  
     MaskBits&=~ALTBIT; (E<QA  
     break; /u pDbP.O  
    case VK_CONTROL: 3sz?49tX  
     MaskBits&=~CTRLBIT;  &DX  
     break; i4\m/&of3y  
    case VK_SHIFT: [8rl{~9E  
     MaskBits&=~SHIFTBIT; X.)D"+xnH  
     break; tRmH6  
    default: //judge the key and send message ^<v]x; 3  
     break; S1E=EVG  
   } V"W)u#4,  
   for(int index=0;index<MAX_KEY;index++){ *S\/l-D  
    if(hCallWnd[index]==NULL) :'K%&e?7s  
     continue; $#HUxwx4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Sj9NhtF]f  
    { Z)dE#A_X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); hgI;^ia  
     bProcessed=TRUE; |C3~Q{A  
    } {on+ ;,  
   } Jsw%.<  
  } Bw*6X` 'Q  
  else if((lParam&0xc000ffff)==1){ //有键按下 /]hE?cmj  
   switch(wParam) 5 $:  q  
   { 5}he)2*uD  
    case VK_MENU: ;eiqzdP  
     MaskBits|=ALTBIT; )NCSO b  
     break; Qhsk09K_=4  
    case VK_CONTROL: 6^v HFJ$  
     MaskBits|=CTRLBIT; "6xTh0D  
     break; 4kdQ h]  
    case VK_SHIFT: SAtK 'Jx[  
     MaskBits|=SHIFTBIT; @ Yzc?+x  
     break; ="AJ &BqHd  
    default: //judge the key and send message pb=yQ}.  
     break; MP%pEUomev  
   } 07qL@![!  
   for(int index=0;index<MAX_KEY;index++){ W6L}T,epX  
    if(hCallWnd[index]==NULL) [y1 x`WOk9  
     continue; N83g=[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) JN<IMH  
    { "M4 gl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Ilv _.  
     bProcessed=TRUE; >TQnCG =  
    } &Ez]pKjB  
   } riY[p,  
  } ma7@vD  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ;sfk@ec  
   for(int index=0;index<MAX_KEY;index++){ [" nDw<U  
    if(hCallWnd[index]==NULL) dT4e[4l  
     continue; mZb[Fi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) z\r|5Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *u?N{LkqS  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 (H-Y-Lk+  
   } ;O Y*`(Id  
  } /%5X:*:H  
 } IiRII)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); XbL\l  
} /8tF7Mmr  
A3c&VT6Q  
  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: ;,Q6AS!  
/;\{zA$uC=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); YMTB4|{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); { 0 vHgi  
eE-c40Bae  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 0Rze9od]$  
1pHt3Vc(G  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >5+]~[S  
{ s^Wh!:>r/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ~<&47'D  
 { ye-R  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 _Vf0MU;3f+  
  SaveBmp(); bRb+3au_x  
  return FALSE; ~f:jI1(}  
 } |m /XGr  
 …… //其它处理及默认处理 ';OZP2  
} a>/cVu'kz  
GUqhm$6a  
 wk (}q  
  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。 a54qv^IS  
PDH00(#;+  
  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。 6m!%X GZ T  
 i%a jL  
  二、编程步骤 ]f~mR_E  
qD?-&>dBWi  
  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"; =Zc Vywz;+  
QwL'5ws{q  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; sU }.2k  
FsyM{LT  
  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; /vG)n9Rc  
^J_rb;m43  
  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; GVt}\e~"  
S|HnmkV66  
  5、 添加代码,编译运行程序。 g4fe(.?c,  
Z_Z; g]|!  
三、程序代码 T6=q[LpsKN  
aO]FQ#l2b  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL =f*Wj\  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) WPzq?yK  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 8>y!=+9_  
#if _MSC_VER > 1000 ?E88y  
#pragma once _6 ,Tb]  
#endif // _MSC_VER > 1000 9X6l`bo'  
#ifndef __AFXWIN_H__ Jf|6 FQo&  
#error include 'stdafx.h' before including this file for PCH dDoKmuY>5  
#endif #Z.2g].  
#include "resource.h" // main symbols lqe71](sK8  
class CHookApp : public CWinApp ddiBjp2.!  
{ 07:N)y,  
 public: aur4Ky> :  
  CHookApp(); V=LJ_T"z0  
  // Overrides si|DxDx  
  // ClassWizard generated virtual function overrides wqyrs|P  
  //{{AFX_VIRTUAL(CHookApp) d:V6.7>,  
 public: /o)o7$6Q  
  virtual BOOL InitInstance(); fX[6  {  
  virtual int ExitInstance(); v1Wz#oP  
  //}}AFX_VIRTUAL [O52Bn  
  //{{AFX_MSG(CHookApp) /K2=GLl;  
  // NOTE - the ClassWizard will add and remove member functions here. !<P|:Oo*Dl  
  // DO NOT EDIT what you see in these blocks of generated code ! E6FT*}Q  
  //}}AFX_MSG mtQlm5l  
  DECLARE_MESSAGE_MAP() %oY=.Ok ]  
}; Xzp!X({   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); vuCl(/P`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *He%%pk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); h72#AN  
BOOL InitHotkey(); 78[5@U  
BOOL UnInit(); 0nbQKoF  
#endif *>,CG:`D  
V<+= t{  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. j~a"z40  
#include "stdafx.h" 6YCFSvA#/  
#include "hook.h" k-uwK-B}v+  
#include <windowsx.h> ~&?{hd.  
#ifdef _DEBUG (,5,}  
#define new DEBUG_NEW QIg.r \>o  
#undef THIS_FILE ;}BDEBl  
static char THIS_FILE[] = __FILE__; NLLLt  
#endif O5:2B\B  
#define MAX_KEY 100 =Hs[peO*  
#define CTRLBIT 0x04 s/"?P/R  
#define ALTBIT 0x02 X>`5YdT~+  
#define SHIFTBIT 0x01 ">pt, QV  
#pragma data_seg("shareddata") '"/Yk=EmlU  
HHOOK hHook =NULL; XW*,Lo5>H\  
UINT nHookCount =0; @\|W#,~  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey =vaC?d3   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT z :_o3W.E  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey U=a'(fX  
static int KeyCount =0; #r ;;d(  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 10 D6fkjf  
#pragma data_seg() GvCB3z  
HINSTANCE hins; 8 FqhSzw  
void VerifyWindow(); RTgR>qI&)  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) | <q9Ee  
//{{AFX_MSG_MAP(CHookApp) gPu0j4&-  
// NOTE - the ClassWizard will add and remove mapping macros here. JXBTd=r_oM  
// DO NOT EDIT what you see in these blocks of generated code! #cRw0bn:  
//}}AFX_MSG_MAP 7oK7f=*Q  
END_MESSAGE_MAP() :+m8~n$/  
)O~V3a  
CHookApp::CHookApp() \z4I'"MC.9  
{ @@O=a  
 // TODO: add construction code here, {B_pjs  
 // Place all significant initialization in InitInstance fuQb h  
} z+Cw*v\Y  
 d Xiv8B1  
CHookApp theApp; *<[Nvk^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) yl=_ /'*  
{ }95;qyQ$  
 BOOL bProcessed=FALSE; E_[)z%&n2  
 if(HC_ACTION==nCode) *61+Fzr  
 { q*^F"D:?k  
  if((lParam&0xc0000000)==0xc0000000){// Key up 4%3R}-'mh  
   switch(wParam) S-8wL%r  
   { 2K Um(B.I  
    case VK_MENU: @DYxDap{  
     MaskBits&=~ALTBIT; EPZ^I)  
     break; P9\!JH!  
    case VK_CONTROL: .K n)sD1  
     MaskBits&=~CTRLBIT; D]s8w  
     break; x'.OLXx>  
    case VK_SHIFT: z`^DQ8+\j  
     MaskBits&=~SHIFTBIT; ?)ROQ1-#@  
     break; g@<E0 q&`$  
    default: //judge the key and send message bHi0N@W!vG  
     break; oBm^RHTZ  
   } z/,qQVv=}4  
   for(int index=0;index<MAX_KEY;index++){ !2R<T/9~  
    if(hCallWnd[index]==NULL) n8!qz:z/  
     continue; aa'u5<<W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0x-58i0  
    { "0nT:!BZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); bvuoo/  
     bProcessed=TRUE; @Y~R*^n"}  
    } |9;6Cp  
   } ,EAf/2C  
  } !&3iZQGWv  
  else if((lParam&0xc000ffff)==1){ //Key down ~is$Onf99#  
   switch(wParam) q:y_#r"_y  
   { /lC&'hT  
    case VK_MENU: sUfYEVjr  
     MaskBits|=ALTBIT; >|"mhNF  
     break; vu&%e\gM  
    case VK_CONTROL: Zj*kHjn"  
     MaskBits|=CTRLBIT; L+c7.l.yT  
     break; &!y7PWHJ  
    case VK_SHIFT: :< )"G&  
     MaskBits|=SHIFTBIT; q]-CTx$  
     break; j#C1+Us  
    default: //judge the key and send message p;GT[Ds^  
     break; |b@H]c;"  
   } $ylQ \Y'  
   for(int index=0;index<MAX_KEY;index++) \G3 P[E[  
   { j &#A 9!  
    if(hCallWnd[index]==NULL) )]=1W  
     continue; 98%M`WY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <h$Nh0  
    { ^k'?e"[gTs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); g=*`6@_=  
     bProcessed=TRUE; _:: q S!  
    } Lqt.S|  
   } h"7:&=e  
  } PJ=N.x f}  
  if(!bProcessed){ N(%%bHi#V  
   for(int index=0;index<MAX_KEY;index++){ ii.L]#3y  
    if(hCallWnd[index]==NULL) bN ,>,hj  
     continue; aAlES< r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) LIo3a38n?y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); hdw-gem{?  
   } +B 4&$z  
  } $#cZJ@;]  
 } 'THcO*<  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 92@/8,[  
} JYY:~2  
d$3;o&VUNI  
BOOL InitHotkey() wIrjWU2  
{ .H M1c  
 if(hHook!=NULL){ Y: ~A-_  
  nHookCount++; l1_Tr2A}7/  
  return TRUE; UN~dzA~V  
 } !J5k?J&{=  
 else !n=?H1@  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Nh I&wl  
  if(hHook!=NULL) D# $Fj  
   nHookCount++; BZ]6W/0  
  return (hHook!=NULL); !besMZ  
} ;B35E!QJ  
BOOL UnInit() YWV"I|Z  
{ U{IY F{;@  
 if(nHookCount>1){ 7j>NUx=j3  
  nHookCount--; ^4+ew>BLSv  
  return TRUE; ;g3z?Uz)  
 } d},IQ,Az:Z  
 BOOL unhooked = UnhookWindowsHookEx(hHook); lZY0A#   
 if(unhooked==TRUE){ AoaRlk-#  
  nHookCount=0; E&\dr;{7  
  hHook=NULL; >@NH Al  
 } BFU6?\r  
 return unhooked; g> lJZD@  
} m15MA.R>  
fn%Gu s~  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) u|!On  
{ 0ssKZ9Lc  
 BOOL bAdded=FALSE; *V\z]Dy-[  
 for(int index=0;index<MAX_KEY;index++){ /Hox]r]'e  
  if(hCallWnd[index]==0){ iqzl(9o.D  
   hCallWnd[index]=hWnd; sr0.4VU1  
   HotKey[index]=cKey; .6,+q2tyk,  
   HotKeyMask[index]=cMask; (xp<@-  
   bAdded=TRUE; Ywj=6 +;  
   KeyCount++; CDDx %#eG>  
   break; 7x/S4Gs'4  
  } E<[_L!2  
 } -BY'E$]4  
 return bAdded; bv.DW,l%'  
} Q?f%]uGFQ  
}(g`l)OX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1g_(xwUp+  
{ 6sRe. ct<  
 BOOL bRemoved=FALSE; IETdL{`~  
 for(int index=0;index<MAX_KEY;index++){ q P<n<  
  if(hCallWnd[index]==hWnd){ Sv*@3x  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ISQC{K']J  
    hCallWnd[index]=NULL; Cm~h\+"  
    HotKey[index]=0; -S7PnR6  
    HotKeyMask[index]=0; b#**`Y  
    bRemoved=TRUE; ?4X8l@fR  
    KeyCount--; ;(a\F  
    break; ;j#$d@VG"  
   } f8ap+][  
  } x=+R0ny  
 } a,o>E4#c  
 return bRemoved; |4UU`J9M  
} <@B zF0  
"[`.I*WNo  
void VerifyWindow() 'C l}IDF  
{ rAc Yt9M#  
 for(int i=0;i<MAX_KEY;i++){ sU {'  
  if(hCallWnd!=NULL){ %5N;SRtv  
   if(!IsWindow(hCallWnd)){ @WppiZ$  
    hCallWnd=NULL; GVFR^pzO  
    HotKey=0; )$V&Nf  
    HotKeyMask=0; vepZod}D  
    KeyCount--; .g CC$  
   } x^UE4$oo  
  } E$$pO.\  
 } Mo+ mO&B  
} NDG3mCl  
tMN^"sjf*  
BOOL CHookApp::InitInstance() z3l= aAw8  
{ / 38b:,  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); |E\0Rv{H3  
 hins=AfxGetInstanceHandle(); aZ$$a+  
 InitHotkey(); 3pxm0|  
 return CWinApp::InitInstance(); sZ,MNF8i  
} _n.2'  
LPjsR=xi  
int CHookApp::ExitInstance() s]=s2.=  
{ 3xhv~be  
 VerifyWindow(); ~R`Rj*Q2Y  
 UnInit(); GP"(+5  
 return CWinApp::ExitInstance(); 7g-#v'.N  
} btq`[gAF\  
KFCL|9P  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file >".,=u'  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ]J^ 9iDTTA  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .s4hFB^n  
#if _MSC_VER > 1000 U] 2fV|Hn  
#pragma once +k!Y]_&(:f  
#endif // _MSC_VER > 1000 r]x;JBy  
< V?CM(1C  
class CCaptureDlg : public CDialog B]PTe~n^  
{ H'Mc]zw_,  
 // Construction 8:Yha4<Bv7  
 public: $9 GRAM.  
  BOOL bTray; V?g@pnN"  
  BOOL bRegistered; ?Rc+H;x=f  
  BOOL RegisterHotkey(); Onr#p4UT  
  UCHAR cKey; Da)rzr|}>3  
  UCHAR cMask; Zk+J=Cwq}  
  void DeleteIcon(); T-Od|T@[  
  void AddIcon(); {VC4rA  
  UINT nCount; B/IPG~aMEZ  
  void SaveBmp(); !P7##ho0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor -.A8kJ  
  // Dialog Data p100dJvq  
  //{{AFX_DATA(CCaptureDlg) 20hF2V  
  enum { IDD = IDD_CAPTURE_DIALOG }; K)2ZH@  
  CComboBox m_Key; :@PM+[B|Q  
  BOOL m_bControl; ICNS+KsI  
  BOOL m_bAlt; @=[/bG  
  BOOL m_bShift; Z+!3m.q  
  CString m_Path; aqvt$u8  
  CString m_Number; >3H/~ Y  
  //}}AFX_DATA myT z  
  // ClassWizard generated virtual function overrides NI eKS_ +  
  //{{AFX_VIRTUAL(CCaptureDlg) kl.)A-6V  
 public: +):t6oX|  
  virtual BOOL PreTranslateMessage(MSG* pMsg); +"Pt?k  
 protected: RU!j"T 5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support G"CV S@  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Sd;/yC8  
  //}}AFX_VIRTUAL 3F,$} r#  
  // Implementation e&dE>m  
 protected: }i1p &EN^  
  HICON m_hIcon; [/#c9RA  
  // Generated message map functions t<O5_}R%d  
  //{{AFX_MSG(CCaptureDlg) w=I' CMRt  
  virtual BOOL OnInitDialog(); ;!4Bw"Gg  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); p*10u@,  
  afx_msg void OnPaint(); qC9$xIWq  
  afx_msg HCURSOR OnQueryDragIcon(); ^/ K\a ,  
  virtual void OnCancel(); j(|G) F  
  afx_msg void OnAbout(); 9Vx2VjK2'  
  afx_msg void OnBrowse(); IVYWda0m  
  afx_msg void OnChange(); QDlEby m  
 //}}AFX_MSG o56_t{<  
 DECLARE_MESSAGE_MAP() %H:uE*WZ  
}; qvz2u]IOw  
#endif Wjt1NfS&  
bS{7*S  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ![WX -"lW  
#include "stdafx.h" Nw@tlT4  
#include "Capture.h" [>"bL$tlo*  
#include "CaptureDlg.h" >;',U<Wd  
#include <windowsx.h> k%\_UYa  
#pragma comment(lib,"hook.lib") **rA/*Oc  
#ifdef _DEBUG  `"v5bk  
#define new DEBUG_NEW .BGM1ph}~  
#undef THIS_FILE "|CzQ&e  
static char THIS_FILE[] = __FILE__; qkC+9Sk  
#endif QRnkj]b  
#define IDM_SHELL WM_USER+1 ~je#gVoUR  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); JGPLVw  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >=hO jV;  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; UhCE.# U  
class CAboutDlg : public CDialog @Md%gEh;&  
{ &H!3]  
 public: [B9'/:  
  CAboutDlg(); NLFSw  
  // Dialog Data -ea>}S  
  //{{AFX_DATA(CAboutDlg) Evkb`dU3n  
  enum { IDD = IDD_ABOUTBOX }; ^4^1)' %  
  //}}AFX_DATA *>!O2c  
  // ClassWizard generated virtual function overrides EWPP&(u3  
  //{{AFX_VIRTUAL(CAboutDlg) Efi@hdEV  
 protected: Y|J\,7CM  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support |pJ)w  
  //}}AFX_VIRTUAL ^yUel.N5"  
  // Implementation A87JPX#R?  
 protected: ryzz!0l  
  //{{AFX_MSG(CAboutDlg) .Gv9RKgd~  
  //}}AFX_MSG E"5 z T1d  
  DECLARE_MESSAGE_MAP() #q1Qa_LXc  
}; 0es[!  
X3#/|>  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) FL!W oTB  
{ 5T;M,w6DV  
 //{{AFX_DATA_INIT(CAboutDlg) ;cl\$TDL  
 //}}AFX_DATA_INIT Uw^`_\si  
} Zrp`91&I  
6_/691  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Go3EWM`Cd8  
{ Tl=cniy]  
 CDialog::DoDataExchange(pDX); 0!F"s>(H  
 //{{AFX_DATA_MAP(CAboutDlg) !%x8!;za  
 //}}AFX_DATA_MAP )W)m?%  
} UKp- *YukT  
{]plT~{e  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) e{8z1t20:  
 //{{AFX_MSG_MAP(CAboutDlg) T9]|*~ ,T  
 // No message handlers a&~_ba+  
 //}}AFX_MSG_MAP 3DnlXH(h1  
END_MESSAGE_MAP() 9^h\vR|]S  
mD-qJ6AM  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) iph>"b$D  
: CDialog(CCaptureDlg::IDD, pParent) _f$8{&`k  
{ 5Jq~EB{"  
 //{{AFX_DATA_INIT(CCaptureDlg) i rMZLc6  
  m_bControl = FALSE; w#eD5y~'oo  
  m_bAlt = FALSE; Y 3r m')c  
  m_bShift = FALSE; IlsXj`!e  
  m_Path = _T("c:\\"); O{a<f7 W  
  m_Number = _T("0 picture captured."); pfgFHNH:  
  nCount=0; n'=-bj`  
  bRegistered=FALSE; (&0%![j&  
  bTray=FALSE; A_1cM#4  
 //}}AFX_DATA_INIT mdvooJ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 LziEF-_  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;T~]|#T\6  
} ^Bn)a"Gd  
$.kP7!`:,  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) yC !`6$  
{ wXp A1,i  
 CDialog::DoDataExchange(pDX); IW3ZHmrpA  
 //{{AFX_DATA_MAP(CCaptureDlg) ]&\HAmOQS  
  DDX_Control(pDX, IDC_KEY, m_Key); 4k_&Q?1  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); zQ9"i  
  DDX_Check(pDX, IDC_ALT, m_bAlt); $j:$ `  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); $u_0"sUV  
  DDX_Text(pDX, IDC_PATH, m_Path); !Uz{dFJf;  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 3}=r.\]U  
 //}}AFX_DATA_MAP :S}!i?n  
} ~C=I{qzF+  
TSqfl/UI  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) .MkHB0 2N  
//{{AFX_MSG_MAP(CCaptureDlg) #pP4\n-~hU  
 ON_WM_SYSCOMMAND() F<q'ivj:w  
 ON_WM_PAINT() m\`dLrPX4j  
 ON_WM_QUERYDRAGICON() zF6 R\w  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 1o)@{x/pd  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;hGC.}X  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 3^ ~M7=k  
//}}AFX_MSG_MAP K[0.4+  
END_MESSAGE_MAP() 5G=<2;  
8A}w}h  
BOOL CCaptureDlg::OnInitDialog() %eWzr  
{ ia 1Sf3  
 CDialog::OnInitDialog(); lY/{X]T.(  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 0xrr9X<  
 ASSERT(IDM_ABOUTBOX < 0xF000); fyPpzA0  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ^I03PIy0l  
 if (pSysMenu != NULL) 9Z]~c^UB  
 { o&P}GcEIw  
  CString strAboutMenu; $&/JY  
  strAboutMenu.LoadString(IDS_ABOUTBOX); P'f =r%  
  if (!strAboutMenu.IsEmpty()) >c%OnA,3  
  { j_*$ Avy  
   pSysMenu->AppendMenu(MF_SEPARATOR); ,gGIkl&  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); t-Rfy`I3  
  } D7|[:``  
 }  (n+2z"/  
 SetIcon(m_hIcon, TRUE); // Set big icon OJiW@Z_\  
 SetIcon(m_hIcon, FALSE); // Set small icon s.I%[kada  
 m_Key.SetCurSel(0); b/'{6zn  
 RegisterHotkey(); 3~Od2nk(x  
 CMenu* pMenu=GetSystemMenu(FALSE); uc!j`G*]  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); S9R(;  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); fe PH=C  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); .?R~!K{`  
 return TRUE; // return TRUE unless you set the focus to a control iSu7K&X9q  
} n2&*5m&$  
,T@+QXh  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) i^Vb42%y  
{ M#X8Rs1`  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) a0I+|fR  
 { Fb=(FQ2Y?  
  CAboutDlg dlgAbout; k#Qav1_  
  dlgAbout.DoModal(); bA}9He1  
 } 4-;"w;  
 else {Q],rv|;  
 { FY_.Vp  
  CDialog::OnSysCommand(nID, lParam); d%_=r." Y  
 } 6" fYSn>  
} Q^X  
|{ W4JFKJ  
void CCaptureDlg::OnPaint() ly"Jl8/<  
{ pgbm2mT9  
 if (IsIconic()) 4?Pdld  
 { FJ0Ity4u6  
  CPaintDC dc(this); // device context for painting ,5oe8\uz  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); "1 O!Ck_n  
  // Center icon in client rectangle {$D[l hj  
  int cxIcon = GetSystemMetrics(SM_CXICON); Cbu/7z   
  int cyIcon = GetSystemMetrics(SM_CYICON); ]&6# {I-  
  CRect rect; HS>(y2}'  
  GetClientRect(&rect); !/] F.0  
  int x = (rect.Width() - cxIcon + 1) / 2; >qj.!npQD  
  int y = (rect.Height() - cyIcon + 1) / 2; K~'!JP8@  
  // Draw the icon x|4m*>Ke  
  dc.DrawIcon(x, y, m_hIcon); Pyh+HD\  
 } \7rAQ[\#V  
 else .nN=M>#/  
 { 4x7(50hp#  
  CDialog::OnPaint(); 6. N?=R  
 } "fK`F/  
} YXCltM E  
np2oXg%  
HCURSOR CCaptureDlg::OnQueryDragIcon() X`#,*HkK  
{ oSVo~F  
 return (HCURSOR) m_hIcon; @>`+eg][?P  
} <vMna< /d  
K$v SdpC  
void CCaptureDlg::OnCancel() rEz-\jLD~  
{ +8qtFog$\g  
 if(bTray) 9V&} %  
  DeleteIcon(); PdiP5S }/  
  CDialog::OnCancel(); .T~<[0Ex+U  
} =k.:XblEe[  
EdGA#i3  
void CCaptureDlg::OnAbout() ,fWQSc\}  
{ wM.z/r\p  
 CAboutDlg dlg; g4b-~1[S  
 dlg.DoModal(); j("$qp v  
} 0XouHU  
vHR-mQUs  
void CCaptureDlg::OnBrowse() TdGda'C  
{ >tF3|:\  
 CString str; )Z6bMAb0'N  
 BROWSEINFO bi; ZEY="pf  
 char name[MAX_PATH]; TljN!nv]  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); *u LOoq  
 bi.hwndOwner=GetSafeHwnd(); N>h/!# ZC  
 bi.pszDisplayName=name; d4ANh+}X"_  
 bi.lpszTitle="Select folder"; ,TeJx+z^  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; )Ve-)rZ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); #,dNhUV#  
 if(idl==NULL) ?%RAX CK  
  return; be&5vl  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ,RmXZnWY  
 str.ReleaseBuffer(); h>ZNPP8N  
 m_Path=str; Oi#4|*b{W  
 if(str.GetAt(str.GetLength()-1)!='\\') e^v5ai  
  m_Path+="\\"; n(X{|?  
 UpdateData(FALSE); "FuOWI{in  
} j,<3[  
W,sU5sjA  
void CCaptureDlg::SaveBmp() D5]AL5=Xt2  
{ -64@}Ts*?  
 CDC dc; /<[S> ;!kr  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); }YV,uJH[  
 CBitmap bm; !`kX</ha.  
 int Width=GetSystemMetrics(SM_CXSCREEN); 7# >;iGuz  
 int Height=GetSystemMetrics(SM_CYSCREEN); %v}SJEXF p  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 0e./yPTT  
 CDC tdc; 8CXZ7 p  
 tdc.CreateCompatibleDC(&dc); B$A`thQp  
 CBitmap*pOld=tdc.SelectObject(&bm); R-7.q  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); $db]b  
 tdc.SelectObject(pOld); EY~b,MIL4  
 BITMAP btm; 4%!#=JCl  
 bm.GetBitmap(&btm); (<M^C>pldf  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ?yAp&Ad  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); +65OR'd  
 BITMAPINFOHEADER bih; )1CYs4lp  
 bih.biBitCount=btm.bmBitsPixel; $ ~>3bik@  
 bih.biClrImportant=0; a[e&O&Z  
 bih.biClrUsed=0; N$'/J-^  
 bih.biCompression=0; 2!-?  
 bih.biHeight=btm.bmHeight; Q1ox<-  
 bih.biPlanes=1; Kmy'z  
 bih.biSize=sizeof(BITMAPINFOHEADER); P9d%80(b4  
 bih.biSizeImage=size; mM`zA%=  
 bih.biWidth=btm.bmWidth; jM <=>P  
 bih.biXPelsPerMeter=0; /"~ D(bw0=  
 bih.biYPelsPerMeter=0; ZtzSG@f  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1 zo0/<dk  
 static int filecount=0; 3C:!\R  
 CString name; ^3>Qf  
 name.Format("pict%04d.bmp",filecount++); MHF31/g\  
 name=m_Path+name; Z|78>0SAt  
 BITMAPFILEHEADER bfh; M.DU^-7  
 bfh.bfReserved1=bfh.bfReserved2=0; J#k3iE}  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Qu 7#^%=  
 bfh.bfSize=54+size; )gX7qQ  
 bfh.bfOffBits=54; z@70{*  
 CFile bf; 4}i2j  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ SW94(4qo  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); LwPZRE#  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); fj 14'T  
  bf.WriteHuge(lpData,size); _:R Q9x'  
  bf.Close(); gK&MdF*  
  nCount++; :S['hBMN  
 } ioIOyj  
 GlobalFreePtr(lpData); Drn{ucIs  
 if(nCount==1) Kmk}Yz  
  m_Number.Format("%d picture captured.",nCount); Z`_`^ \"  
 else 8}B*a;d  
  m_Number.Format("%d pictures captured.",nCount); R,Gr{"H  
  UpdateData(FALSE); "hE/f~\  
} [{s 1= c  
4[\$3t.L  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) / 7i>0J]  
{ JPo.&5k  
 if(pMsg -> message == WM_KEYDOWN) 33R1<dRk  
 { D)kh"cK*1  
  if(pMsg -> wParam == VK_ESCAPE) B/:+(|  
   return TRUE; %_kXC~hH_  
  if(pMsg -> wParam == VK_RETURN) j|6@>T1  
   return TRUE; 6}V)\"u&   
 } 4=; . <  
 return CDialog::PreTranslateMessage(pMsg); XwZ~pY ~  
} WO}l&Q  
uq/z.m  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) m7dpr$J  
{ `5HFRgL`.  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 0n FEPMO  
  SaveBmp(); V XE85  
  return FALSE; \vH /bL  
} G<F+/Oi&DX  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ E?VPCx  
 CMenu pop; 0r4,27w  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); &1=Je$,  
 CMenu*pMenu=pop.GetSubMenu(0); rL kUIG  
 pMenu->SetDefaultItem(ID_EXITICON); 9EPE.+ns  
 CPoint pt; v jTs[eq>  
 GetCursorPos(&pt); YsX&]4vzm  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ZsgJ6 Y  
 if(id==ID_EXITICON) 5} v(Ks>  
  DeleteIcon(); 'ycr/E&m{  
 else if(id==ID_EXIT) >e g8zN  
  OnCancel(); G,{=sFX  
 return FALSE; +*I'!)T^B  
} uTWij4)a  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); y v$@i A  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) |8QXjzH  
 AddIcon(); 2H,^i,  
 return res; sIVVF#0}]  
} z%4E~u10  
{Df97n%h;  
void CCaptureDlg::AddIcon()  #  
{ 1 #zIAN>  
 NOTIFYICONDATA data; N WSm  
 data.cbSize=sizeof(NOTIFYICONDATA); )aV\=a |A  
 CString tip; "mbjS(-eg  
 tip.LoadString(IDS_ICONTIP); }NH\Q$IU  
 data.hIcon=GetIcon(0); fXL&?~fS  
 data.hWnd=GetSafeHwnd(); QU#u5sX A  
 strcpy(data.szTip,tip); iY|zv|;]=  
 data.uCallbackMessage=IDM_SHELL; P#8+GN+bF  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; aEO``W  
 data.uID=98; QNN*/n  
 Shell_NotifyIcon(NIM_ADD,&data); n+sV $*wvS  
 ShowWindow(SW_HIDE); wqB 5KxO  
 bTray=TRUE; 3Y;<Q>roT  
} 9_$i.@L 1  
T%[&[8{8  
void CCaptureDlg::DeleteIcon() mJ'Q9x"  
{ (Xak;Xum1  
 NOTIFYICONDATA data; -a[[1  
 data.cbSize=sizeof(NOTIFYICONDATA); )s#NQ.T[  
 data.hWnd=GetSafeHwnd(); k;7R3O@  
 data.uID=98; _v[yY3=3  
 Shell_NotifyIcon(NIM_DELETE,&data); ~o <+tL  
 ShowWindow(SW_SHOW); B}:/2?gQ  
 SetForegroundWindow(); $!'S7;*uW  
 ShowWindow(SW_SHOWNORMAL); hJ)\Vo  
 bTray=FALSE; 7EfLd+  
} =6sA49~M  
+i\ +bR  
void CCaptureDlg::OnChange() q7z;bA  
{ .wdWs tQ  
 RegisterHotkey(); !nm[ZrS P  
} 5W Z9z-6  
nDFF,ge;a#  
BOOL CCaptureDlg::RegisterHotkey() (TX\vI&  
{ u|.c?fW'3  
 UpdateData(); EgYM][:UU  
 UCHAR mask=0; M0B6v} ^H  
 UCHAR key=0; LH:M`\(DL1  
 if(m_bControl) tx+KxOt9Y  
  mask|=4; A^%li^qz  
 if(m_bAlt) 4lb(qKea  
  mask|=2; B#A .-nb  
 if(m_bShift) #"T< mM7  
  mask|=1; Ej[:!L  
  key=Key_Table[m_Key.GetCurSel()]; ORc20NFy7  
 if(bRegistered){ v^;p]_c~2  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); T?DX|?2X  
  bRegistered=FALSE; 'j#J1 xwJ  
 } oP"X-I  
 cMask=mask; UI?AM 34  
 cKey=key; @) \{u$  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 1xBg^  
 return bRegistered; Q.b<YRZ  
} x;w^&<hQ\  
E7CeE6U  
  四、小结 I6.!0.G  
(V06cb*42[  
  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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