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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: *V#v6r7<Y/  
  W=M&U  
  一、实现方法 Ht+ng  
qY\zZ  
  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: (y|{^@  
@z"Zj 3ti  
#pragma data_seg("shareddata") g! ~&PT)*  
HHOOK hHook =NULL; //钩子句柄 hY+3PNiI@  
UINT nHookCount =0; //挂接的程序数目 2n+j.  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 C0/s/p'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 (bt^L3}a  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 5&7)hMppI  
static int KeyCount =0; X5 lB],t"=  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 SdC505m0*  
#pragma data_seg() l|O^yNS  
I9*o[Jp5  
  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。 k/AcXU%O+  
l2GMVAca  
  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: ]Vhhx`0  
+JZ<9,4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR G?\o_)IJ  
cKey,UCHAR cMask) ;d G.oUk=  
{ $>v^%E;Y4  
 BOOL bAdded=FALSE; q_>DX,A  
 for(int index=0;index<MAX_KEY;index++){ FW#Lf]FJ  
  if(hCallWnd[index]==0){ -aG( Yx  
   hCallWnd[index]=hWnd; /:"%m:-P  
   HotKey[index]=cKey; Ek _k_!  
   HotKeyMask[index]=cMask; X +;Q=  
   bAdded=TRUE; Noz+\O\  
   KeyCount++; /' L20aN2  
   break; [?Y u3E\  
  } asP>(Li  
 } I@cKiB  
 return bAdded; E#Ynn6  
} i_g="^  
//删除热键 9 U1)sPH;  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Dn$zwksSs  
{ a$#,'UB  
 BOOL bRemoved=FALSE; R*.XbkW~  
 for(int index=0;index<MAX_KEY;index++){ @ :Q];rc  
  if(hCallWnd[index]==hWnd){ @)&b..c?_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ C fQj7{  
    hCallWnd[index]=NULL; +f\tqucI3  
    HotKey[index]=0; Zm%}AzM  
    HotKeyMask[index]=0; O8SX#,3^}  
    bRemoved=TRUE; ]@l~z0^|[_  
    KeyCount--; L6BHh_*E  
    break; Q !5Tw  
   } NF0IF#;a  
  } 7qon:]b4  
 } U"-mLv"|  
 return bRemoved;  &N0W!  
} t(lTXG  
l1jS2O(  
X X{:$f+  
  DLL中的钩子函数如下: Bp^>R`,  
vtR<(tOu@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) vb: '%^v  
{ <| |Lj  
 BOOL bProcessed=FALSE; &gF{<$$  
 if(HC_ACTION==nCode) ~J)4(411  
 { GY,@jp|R  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 0VoC|,$U  
   switch(wParam) $>/J8iB  
   {  %P_\7YBC>  
    case VK_MENU: 'Twi @I  
     MaskBits&=~ALTBIT; dge58A)Q  
     break; 8(KsU,%d  
    case VK_CONTROL: jR@-h"2*A  
     MaskBits&=~CTRLBIT; 1|/2%IDUI  
     break; :L:;~tK  
    case VK_SHIFT: zQ]IlMt  
     MaskBits&=~SHIFTBIT; Uvf-h4^J]:  
     break; 9<7Q{  
    default: //judge the key and send message $0LlaN@e  
     break; a9QaFs"  
   } @pytHN8( $  
   for(int index=0;index<MAX_KEY;index++){ 1{o CMq/v  
    if(hCallWnd[index]==NULL) CvQ LF9|  
     continue; 1Od: I}@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]*i>KR@G  
    { VmBLNM?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -rH4/Iby  
     bProcessed=TRUE; <py~(q  
    } J)(]cW.  
   } ih+kh7J-  
  } b4%IyJr  
  else if((lParam&0xc000ffff)==1){ //有键按下 I_pA)P*Q(6  
   switch(wParam) 0)ST_2Ci  
   { +Ya-h~7;g#  
    case VK_MENU: }'H Da M  
     MaskBits|=ALTBIT; M*c\=(  
     break; _nx|ZJ  
    case VK_CONTROL: H:[z#f|t  
     MaskBits|=CTRLBIT; 3J'a  
     break; Y#]Y$n  
    case VK_SHIFT: Tj:+:B(HB  
     MaskBits|=SHIFTBIT; ^~BJu#uVyy  
     break; 0QC*Z (  
    default: //judge the key and send message b17p; wS  
     break; G>:l(PW:  
   } #Q'i/|g   
   for(int index=0;index<MAX_KEY;index++){ _LK>3S qd  
    if(hCallWnd[index]==NULL) S^x9 2&!  
     continue; y]?$zbB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "g=ux^+X\  
    { gLpWfT29V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); w_U5w  
     bProcessed=TRUE; tD4IwX  
    } @~63%6r#4M  
   } zZiB`%  
  } U4N S.`V  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 (O`=$e  
   for(int index=0;index<MAX_KEY;index++){ +IS$Un  
    if(hCallWnd[index]==NULL) r<|\4zIo/  
     continue; >F-J}P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ._FgQ` `PL  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); v(: VUo]H  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 /$9/,5|EA  
   } n]j(tP  
  } #=O0-si ]P  
 } ,E>VYkoA  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |(P>'fat-p  
} e#zGLxa  
S0 yPg9v  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: er qm=)  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); P?0b-Qr$a  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  )bK<t  
U;jk+i  
  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: o9~qJnB/O  
h M8G"b  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) qQ1m5_OD`z  
{ uq 6T|Zm  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) T.1z<l""  
 { 6=')*_~/  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 lA]u8+gXd  
  SaveBmp(); d!gm4hQhl  
  return FALSE; sdO;vp^:b  
 } 6iC}%eU  
 …… //其它处理及默认处理 2j"%}&  
} 6&u,.  
9CN / v  
9J|YP}%  
  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。 G2jEwi  
7 1)#'ey  
  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。 t]@ Zd*  
P' J_:\  
  二、编程步骤 @+{S-iD"  
uY;/3 ?k&  
  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"; NK4ven7/  
4\$Ze0tv  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; /60[T@Mz  
;^*^ :L  
  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; {:oZ&y)Ac  
*508PY  
  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; #!hpe^t  
}j:ae \(  
  5、 添加代码,编译运行程序。 NeK:[Q@je  
i#-Jl7V[a  
三、程序代码 #dl8+  
ow$#kQ&R O  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL @O3w4Zs  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) n >eIQaV  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 7}lZa~/  
#if _MSC_VER > 1000 .xk<7^ZD  
#pragma once _*;cwMne-  
#endif // _MSC_VER > 1000 Zq`bd55~  
#ifndef __AFXWIN_H__ ,v6Jr3  
#error include 'stdafx.h' before including this file for PCH z)]EB6uRg  
#endif TY#1Z )%  
#include "resource.h" // main symbols N%_~cR;  
class CHookApp : public CWinApp Y7jD:P  
{ (la   
 public: txgGL'  
  CHookApp(); DRzpV6s  
  // Overrides  JA)gM  
  // ClassWizard generated virtual function overrides [n}c}%  
  //{{AFX_VIRTUAL(CHookApp) lZua"Ju  
 public: c]"B)I1L  
  virtual BOOL InitInstance(); xUw\Y(!  
  virtual int ExitInstance(); -w2g a1  
  //}}AFX_VIRTUAL tEEhSG)s%  
  //{{AFX_MSG(CHookApp) KW;xlJz(j  
  // NOTE - the ClassWizard will add and remove member functions here. a-} %R  
  // DO NOT EDIT what you see in these blocks of generated code ! 54;iLL  
  //}}AFX_MSG Sx~_p3_5U  
  DECLARE_MESSAGE_MAP() RXof$2CZS  
}; '~f@p~P  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Z8#I  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HdLkof2i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7]^ }  
BOOL InitHotkey(); I^wj7cFo5  
BOOL UnInit(); FU[,,a0<<  
#endif [@y=% \%R  
XnY}dsS O  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. lt$7 97  
#include "stdafx.h" c,-x}i0c  
#include "hook.h" 'LOqGpmVc  
#include <windowsx.h> ^GAdl}  
#ifdef _DEBUG 'wZy: c  
#define new DEBUG_NEW -'N#@Wdr  
#undef THIS_FILE Nb8<8O ^  
static char THIS_FILE[] = __FILE__; %1<p1u'r?#  
#endif dSL %%  
#define MAX_KEY 100 S]o  
#define CTRLBIT 0x04 ?dmMGm0T9  
#define ALTBIT 0x02 \}Wkj~IX  
#define SHIFTBIT 0x01 0!VLPA:  
#pragma data_seg("shareddata") X or ,}. w  
HHOOK hHook =NULL; 4l1=l#\S  
UINT nHookCount =0; w2,T.3DT  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey =%u|8Ea*`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT c@^:tB  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey F@*lR(4C  
static int KeyCount =0; ?% X9XH/!  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift nSow$6T_  
#pragma data_seg() MU e 'xK  
HINSTANCE hins; FezW/+D  
void VerifyWindow(); otIJ[Mvyq  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ?.A|Fy^  
//{{AFX_MSG_MAP(CHookApp) |)4$\<d  
// NOTE - the ClassWizard will add and remove mapping macros here. w@ 5/mf?  
// DO NOT EDIT what you see in these blocks of generated code! Hb+#*42v  
//}}AFX_MSG_MAP 8 (KfX%  
END_MESSAGE_MAP() A{J1 n  
C~;0A!@]Y  
CHookApp::CHookApp() bsP ;  
{ y;Zfz~z  
 // TODO: add construction code here, mce`1Tjw  
 // Place all significant initialization in InitInstance p)^:~ ll  
} Fp6Y Y  
{l11WiqQH  
CHookApp theApp; =zjUd  5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) cMWO_$  
{ &v-V_.0(H  
 BOOL bProcessed=FALSE; /C:'qhY,  
 if(HC_ACTION==nCode) xI4I1"/  
 { j'i42-Lt/p  
  if((lParam&0xc0000000)==0xc0000000){// Key up Yq?I>  
   switch(wParam) i-FUAR  
   { HV9SdJOf  
    case VK_MENU: SN{*:\>,  
     MaskBits&=~ALTBIT; 5An0D V5  
     break; /kA19E4  
    case VK_CONTROL: ;a3nH  
     MaskBits&=~CTRLBIT; Xe SbA  
     break; y9L#@   
    case VK_SHIFT: oyt//SE  
     MaskBits&=~SHIFTBIT; @."o:K  
     break; Inc:t_  
    default: //judge the key and send message v|I5Gz$qpa  
     break; fBgKX ?Y  
   } --twkD  
   for(int index=0;index<MAX_KEY;index++){ i f<<lq  
    if(hCallWnd[index]==NULL) $uw+^(ut  
     continue; M#cr*%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) p}A4K#G  
    { Jo3(bl %u  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -z0{\=@#m  
     bProcessed=TRUE; H 1D;:n  
    } 8KtgSash  
   } n+qVT4o  
  } ~J-|,ZMd  
  else if((lParam&0xc000ffff)==1){ //Key down P"x-7>c>Y  
   switch(wParam) ZGpTw[5ql  
   { %p2x^air  
    case VK_MENU: bfJ`}xl(8  
     MaskBits|=ALTBIT; O_Rcd&<mr  
     break; UY-IHz;&O-  
    case VK_CONTROL: 2-V)>98  
     MaskBits|=CTRLBIT; [u9JL3  
     break; [-t> G!)  
    case VK_SHIFT: N4H+_g|  
     MaskBits|=SHIFTBIT; LBkcs4+  
     break; @y(Wy}  
    default: //judge the key and send message @ 9 { %Kn  
     break; vA;F]epr!  
   } T5azYdzJy  
   for(int index=0;index<MAX_KEY;index++) %L j0  
   { t\pK`DM-[  
    if(hCallWnd[index]==NULL) *?bk?*?s  
     continue; `_1(Q9Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hOB\n!  
    { D*cyFAF  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); x$n~f:1Y  
     bProcessed=TRUE; &QTeGn  
    } '}Wu3X  
   } IE)"rTI)b  
  } lU $4NU wM  
  if(!bProcessed){ ``$%L=_m  
   for(int index=0;index<MAX_KEY;index++){ H=&/Q  
    if(hCallWnd[index]==NULL) 0TO_1 0D  
     continue; RM&H!E<#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) K3rBl!7v  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); r]8x;v1  
   } {^cF(7p  
  } %i$M/C"(  
 } 2;4]PRD6w  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ypD<2z^  
} $_RWd#Q(  
hza> jR  
BOOL InitHotkey() Z'Exw-ca  
{ *p&^!ct  
 if(hHook!=NULL){ _ }E-~I>  
  nHookCount++; #2Pr Gz]  
  return TRUE; "x(>Sj\%I  
 } !%c{+]g  
 else !/Iq{2LX  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); l'*^$qc  
  if(hHook!=NULL)  R"U/RS  
   nHookCount++; <0u\dU  
  return (hHook!=NULL); oX'0o 'c  
} YDQ:eebg(  
BOOL UnInit() 4$ Dt8!p0  
{ )jyq{Jb  
 if(nHookCount>1){ d,c8Hs8  
  nHookCount--; gjj 93  
  return TRUE; #NvQmz?J?  
 } ;n`R\NO9  
 BOOL unhooked = UnhookWindowsHookEx(hHook); b?_e+:\UV  
 if(unhooked==TRUE){ gi6g"~%@q1  
  nHookCount=0; z`k El@  
  hHook=NULL; YD&|1h  
 } z Yw;q3"  
 return unhooked; ?y ~TCqV  
} q#P$'7"  
10wvfRhng  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {<qF}i:V  
{ V0K16#}1gM  
 BOOL bAdded=FALSE; ~xGoJrF\  
 for(int index=0;index<MAX_KEY;index++){  _e%dM  
  if(hCallWnd[index]==0){ KZ=u54  
   hCallWnd[index]=hWnd; 8b|OXWl  
   HotKey[index]=cKey; & _; y.!  
   HotKeyMask[index]=cMask; qgoJ4Z*  
   bAdded=TRUE; t\h$&[[l'z  
   KeyCount++; ^+ZgWS^%  
   break; '77~{jy  
  } dsJm>U)  
 } kv6Cp0uFg  
 return bAdded; 1y J5l,q  
} JVtQ ,oZ  
/<);=&[  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .XXW|{  
{ 57wFf-P  
 BOOL bRemoved=FALSE; XZ`:wmc|  
 for(int index=0;index<MAX_KEY;index++){ RK[D_SmS  
  if(hCallWnd[index]==hWnd){ nq"evD5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){  qve ./  
    hCallWnd[index]=NULL; -$(Jk<  
    HotKey[index]=0; DAfyK?+UL  
    HotKeyMask[index]=0; H&#{l)  
    bRemoved=TRUE; &-%>q B|*  
    KeyCount--; 9'?se5\  
    break; NYwR2oX  
   } a5@z:i  
  } Q8T`wd$D#  
 } j9d!yW  
 return bRemoved; -(i(02PX  
} O. ,3|  
7tNc=,x}  
void VerifyWindow() ?+~cA^-3T  
{ ~e `Bq>  
 for(int i=0;i<MAX_KEY;i++){ t 42ub  
  if(hCallWnd!=NULL){ M*sR3SZ  
   if(!IsWindow(hCallWnd)){ .Da'pOe  
    hCallWnd=NULL; "9IYB)Js  
    HotKey=0; g:7,~}_}^  
    HotKeyMask=0; *4S-z&,.c  
    KeyCount--; 0V$k7H$Z  
   } k1^\|   
  } hA}~es=c  
 } -#In;~  
} #*9-d/K  
,HB2 hHD  
BOOL CHookApp::InitInstance() T f4tj!t-  
{ r X'*|]  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); {D`'0Z1"  
 hins=AfxGetInstanceHandle(); SJ?6{2^  
 InitHotkey(); c$:1:B9\  
 return CWinApp::InitInstance(); t23'x0l  
} +JRF0T  
2 PqS%`XiS  
int CHookApp::ExitInstance() #3$\Iu  
{ i;z{zVR  
 VerifyWindow(); q%(EYM5Y  
 UnInit(); 5| B(\wqG  
 return CWinApp::ExitInstance(); m<rhIq  
} tZyo`[La  
 =<}<Ny  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file gF?[rqz{  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) t5B7I59  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ j.e0;! (L}  
#if _MSC_VER > 1000 O.`Jl%  
#pragma once DdQ;Q5|  
#endif // _MSC_VER > 1000 tVuWVJ4M  
{-3LIO  
class CCaptureDlg : public CDialog \u,}vpp z  
{ k%s_0 @  
 // Construction %`MQmXgM  
 public: 3`E=#ff%  
  BOOL bTray; +mj*o(  
  BOOL bRegistered; kOO Gw:/  
  BOOL RegisterHotkey(); fyTAou6hI  
  UCHAR cKey; Jn:ZYqc  
  UCHAR cMask; 5r~# 0Zf*  
  void DeleteIcon(); S$)*&46g  
  void AddIcon(); C%d_@*82  
  UINT nCount; !oPq?lW9  
  void SaveBmp(); +T/FeVQ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 7SDFz}  
  // Dialog Data L`f^y;Y.  
  //{{AFX_DATA(CCaptureDlg) >~%e$a7}+  
  enum { IDD = IDD_CAPTURE_DIALOG }; 'c2W}$q  
  CComboBox m_Key; :NJ_n6E  
  BOOL m_bControl; :B3[:MpL}  
  BOOL m_bAlt; f-DL:@crU  
  BOOL m_bShift; Z;9>S=w!  
  CString m_Path; XO#/Fv!  
  CString m_Number; fjvN$NgVs  
  //}}AFX_DATA ojYbR<jn9  
  // ClassWizard generated virtual function overrides x{D yTtX<  
  //{{AFX_VIRTUAL(CCaptureDlg) ? WJ> p  
 public: CYOI.#m2  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 8!.ojdyn  
 protected: 3bO(?l`3h  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support F, U*yj  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); oFOnjK"|F  
  //}}AFX_VIRTUAL ?X@fKAj  
  // Implementation +)JpUqHa  
 protected: DN4$Jva  
  HICON m_hIcon; )`^p%k  
  // Generated message map functions ^u 3V E  
  //{{AFX_MSG(CCaptureDlg) wFG3KzEq ~  
  virtual BOOL OnInitDialog(); zD?oXs  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Kw#so; e  
  afx_msg void OnPaint(); 9x,RvWTb  
  afx_msg HCURSOR OnQueryDragIcon(); *~w[eH!!  
  virtual void OnCancel();  KWLbD#  
  afx_msg void OnAbout(); l7&$}x -  
  afx_msg void OnBrowse(); nUkaz*4qU  
  afx_msg void OnChange(); ^vG8#A}]  
 //}}AFX_MSG =zwOq(Bh W  
 DECLARE_MESSAGE_MAP() 1lv2@QH9  
}; d)~Fmi;  
#endif f/CuE%7BR  
CI3XzH\IX*  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file B"%{i-v>**  
#include "stdafx.h" N},n `Yl.  
#include "Capture.h" _X@v/sAy  
#include "CaptureDlg.h" Tw +  
#include <windowsx.h> )BRKZQN  
#pragma comment(lib,"hook.lib") T#bu V  
#ifdef _DEBUG O%r;5kP  
#define new DEBUG_NEW z=$jGL  
#undef THIS_FILE fu~ +8CE.  
static char THIS_FILE[] = __FILE__; Ivb 4P`{  
#endif {rcnM7 S1L  
#define IDM_SHELL WM_USER+1 b(9FZ]7S  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _{M\Bs2<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); pmX#E  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; >[X{LI(_<<  
class CAboutDlg : public CDialog %#$EP7"J  
{ Wh&8pH:  
 public: [Y`,qB<B  
  CAboutDlg(); {[+2n]f_G  
  // Dialog Data u ElAnrm  
  //{{AFX_DATA(CAboutDlg) iOG[>u0h  
  enum { IDD = IDD_ABOUTBOX }; EM\'GW  
  //}}AFX_DATA _V\Bp=9W  
  // ClassWizard generated virtual function overrides ZY:[ekm%4Z  
  //{{AFX_VIRTUAL(CAboutDlg) Iy }:F8F>g  
 protected: SXt{k<|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support fHZTXvxoL  
  //}}AFX_VIRTUAL Hk|0HL  
  // Implementation %Ts PyiYl  
 protected: ^Idle*+  
  //{{AFX_MSG(CAboutDlg) RxQh2<?  
  //}}AFX_MSG /EG~sRvl}  
  DECLARE_MESSAGE_MAP() @u1zB:  
}; e${)w-R/e  
B<-kzt  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) pC_O:f>vJ  
{ hUm'8)OJ  
 //{{AFX_DATA_INIT(CAboutDlg) M?;y\vS?.  
 //}}AFX_DATA_INIT u<n Lag  
} ~xoF6 CF  
iPrLwheb  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) n#=o?!_4  
{ 1 `KN]Nt  
 CDialog::DoDataExchange(pDX); hI(SOsKs  
 //{{AFX_DATA_MAP(CAboutDlg) +CI1V>6^  
 //}}AFX_DATA_MAP aj}(E +  
} Vrvic4  
~/_SMPLo  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) M2U&?V C!  
 //{{AFX_MSG_MAP(CAboutDlg) rLX4jT^  
 // No message handlers YTw#J OO  
 //}}AFX_MSG_MAP B^^r\L9  
END_MESSAGE_MAP() K5"#~\D  
)*:`':_a  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Dwl3 Cj  
: CDialog(CCaptureDlg::IDD, pParent) n-TQ*&h]3S  
{ ;.bm6(;  
 //{{AFX_DATA_INIT(CCaptureDlg) WMj}kq)SY)  
  m_bControl = FALSE; CSCN['x  
  m_bAlt = FALSE; n>'Kp T9|  
  m_bShift = FALSE; <G*nDFWf  
  m_Path = _T("c:\\"); r$wxk 4%Rz  
  m_Number = _T("0 picture captured."); ~gu3g^<0v  
  nCount=0; TB;o~>9U  
  bRegistered=FALSE; 0VK-g}"x  
  bTray=FALSE; _FwK-?4E-  
 //}}AFX_DATA_INIT uWrQ&}@  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Xb QlHfrS  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); FW.$5*f='  
} EJ`T$JD  
\Y}3cE  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) mZUfn%QXb(  
{ 3 LdQ]S  
 CDialog::DoDataExchange(pDX); ./$cMaDJ  
 //{{AFX_DATA_MAP(CCaptureDlg) fJWC)E  
  DDX_Control(pDX, IDC_KEY, m_Key); F9*g=  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); p7H3J?`w1+  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 5cWw7V<m  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); =v*.p=r  
  DDX_Text(pDX, IDC_PATH, m_Path); PH{_ ,X  
  DDX_Text(pDX, IDC_NUMBER, m_Number); [ib P%xb  
 //}}AFX_DATA_MAP %N#%|2B  
} $Q*<96M  
/>j';6vi  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) eW>3XD4  
//{{AFX_MSG_MAP(CCaptureDlg) d9n?v)<v  
 ON_WM_SYSCOMMAND() 7G)H.L)$m"  
 ON_WM_PAINT() PoIl>c1MS  
 ON_WM_QUERYDRAGICON() 1$*%"5a  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) |A8/FU2{  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) DvM5 k  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Sc7U |s  
//}}AFX_MSG_MAP `|Or{ih  
END_MESSAGE_MAP() mYU9 trHV  
|] Qg7m,O  
BOOL CCaptureDlg::OnInitDialog() {6oE0;2o'  
{ FaBqj1O1  
 CDialog::OnInitDialog(); X<R?uI?L  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); jVH|uX"M5Y  
 ASSERT(IDM_ABOUTBOX < 0xF000); 0KD]j8^  
 CMenu* pSysMenu = GetSystemMenu(FALSE); D13Rx 6b  
 if (pSysMenu != NULL) rcGb[=Bf  
 { 2[gFkyqe  
  CString strAboutMenu;  ykrr2x  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ujJI 1I  
  if (!strAboutMenu.IsEmpty()) 4ikdM/  
  { "YB** Y  
   pSysMenu->AppendMenu(MF_SEPARATOR); ?3O9eZY@  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); eznypY=  
  } YSaJeU>@  
 } D/=5tOy  
 SetIcon(m_hIcon, TRUE); // Set big icon U?!>Nd  
 SetIcon(m_hIcon, FALSE); // Set small icon SwU\ q]^|Z  
 m_Key.SetCurSel(0); uf&N[M  
 RegisterHotkey();  {Ha8]y  
 CMenu* pMenu=GetSystemMenu(FALSE); KzQ3.)/q  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ]QuM<ms  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); = P   
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); IuZ) [*W  
 return TRUE; // return TRUE unless you set the focus to a control TT9z_Q5~  
} {-A^g!jT&  
|+$%kJR=  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 1jX3ey~  
{ )z8!f}:De=  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) %0Y=WYUH>  
 { KLX/O1B  
  CAboutDlg dlgAbout; 'Z`$n8  
  dlgAbout.DoModal(); $#|gLVOQ  
 } <94_@3  
 else (5Sivw*mP  
 { IG3,XW  
  CDialog::OnSysCommand(nID, lParam); 6DZ),F,M  
 } Iyo@r%I  
} &P,^.'  
?X&6M;Zi  
void CCaptureDlg::OnPaint() zX#%{#9  
{ `HuCT6O  
 if (IsIconic()) eyp,y2Tz  
 { *. &HD6Qr  
  CPaintDC dc(this); // device context for painting x3rlJs`$;  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 8t=(,^c  
  // Center icon in client rectangle _ %%Z6x(  
  int cxIcon = GetSystemMetrics(SM_CXICON); *6 U&Qy-M  
  int cyIcon = GetSystemMetrics(SM_CYICON); 4:9KR[y/  
  CRect rect; A6oq.I0  
  GetClientRect(&rect); 8UkKU_Uso  
  int x = (rect.Width() - cxIcon + 1) / 2; 0R0{t=VJZ  
  int y = (rect.Height() - cyIcon + 1) / 2; LB/C-n.`  
  // Draw the icon p N\Vr8tJ  
  dc.DrawIcon(x, y, m_hIcon); >E,U>@+  
 } m4:^}O-#  
 else VB<Jf'NU  
 { t!K*pM  
  CDialog::OnPaint();  9dzdrT  
 } OTZ_c1"K  
} 1T)Zh+?)}  
`m.eM  
HCURSOR CCaptureDlg::OnQueryDragIcon() !K? qgM  
{ y&_m 4Zw"  
 return (HCURSOR) m_hIcon; B??J@+Nf  
} N S#TW  
!Oi~:Pp  
void CCaptureDlg::OnCancel() +PK6-c\r  
{ ,p;_\\<  
 if(bTray) V Yw%01#  
  DeleteIcon(); _p?s9&  
  CDialog::OnCancel(); FecktD=  
} 5( _6+'0  
j6(?D*x  
void CCaptureDlg::OnAbout() ,i.%nZw\  
{ 1 qi@uYDug  
 CAboutDlg dlg; ?r_l8  
 dlg.DoModal(); KS*oxZ  
} ]4 (?BJ  
!jqWwi  
void CCaptureDlg::OnBrowse() T#Z%y!6  
{ abxDB  
 CString str; 8e0."o.6  
 BROWSEINFO bi; Y\v-,xPm  
 char name[MAX_PATH]; @DC)]C2  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); k n8N,,+  
 bi.hwndOwner=GetSafeHwnd(); #0;HOeIiH  
 bi.pszDisplayName=name; j8 C8X$  
 bi.lpszTitle="Select folder"; _#o' +_Z  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; }1-I[q6  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); V[a[i>,Z  
 if(idl==NULL) >"3>fche  
  return; 9SMiJad<  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); r.0oxH']  
 str.ReleaseBuffer(); mKq"3 4F  
 m_Path=str; M`D$!BJr  
 if(str.GetAt(str.GetLength()-1)!='\\') UK*qKj. )  
  m_Path+="\\"; 2q} ..  
 UpdateData(FALSE); =8=!Yc(>  
} >5T_g2pkv  
9j*0D("  
void CCaptureDlg::SaveBmp() N~ANjn/wL  
{ kcB+_  
 CDC dc; &@3m -Z  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); !MQ N  H  
 CBitmap bm; ( #&|Dp^'  
 int Width=GetSystemMetrics(SM_CXSCREEN); Mp\<cE  
 int Height=GetSystemMetrics(SM_CYSCREEN); ^%y`u1ab  
 bm.CreateCompatibleBitmap(&dc,Width,Height); {F|48P;J  
 CDC tdc; b]gY~cbI8  
 tdc.CreateCompatibleDC(&dc); ezTZnutZ  
 CBitmap*pOld=tdc.SelectObject(&bm); =neL}Fav56  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); GJ 'spgz  
 tdc.SelectObject(pOld); y|_Eu:  
 BITMAP btm; OY"6J@[z  
 bm.GetBitmap(&btm); ZkB3[$4C=5  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; /,|CrNwY*  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); (sw-~U%  
 BITMAPINFOHEADER bih; 8n4V cu  
 bih.biBitCount=btm.bmBitsPixel; cjULX+h  
 bih.biClrImportant=0; EP7AP4  
 bih.biClrUsed=0; %IBL0NQT  
 bih.biCompression=0; [;O^[Iybf:  
 bih.biHeight=btm.bmHeight; A[UP"P~u/  
 bih.biPlanes=1; TOI4?D]  
 bih.biSize=sizeof(BITMAPINFOHEADER); jJwkuh8R  
 bih.biSizeImage=size; N<z`yV  
 bih.biWidth=btm.bmWidth; +?`b=6e(`  
 bih.biXPelsPerMeter=0; @kD8^,(oH  
 bih.biYPelsPerMeter=0; 8(X0 :  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); >{Rb 3Z]  
 static int filecount=0; &d`^ E6#  
 CString name; m(sXk}e;1  
 name.Format("pict%04d.bmp",filecount++); xk~Nmb}  
 name=m_Path+name; <M[U#Q~?~e  
 BITMAPFILEHEADER bfh; $M"0BZQ?y!  
 bfh.bfReserved1=bfh.bfReserved2=0; :XT?jdg  
 bfh.bfType=((WORD)('M'<< 8)|'B'); +_HdX w#  
 bfh.bfSize=54+size; G5]1s  
 bfh.bfOffBits=54; C>|@& o1  
 CFile bf; {,O`rW_eS  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ aw}+'(?8]  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); \Rk$t7ZH  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); p*;Qz  
  bf.WriteHuge(lpData,size); "EftN5?/  
  bf.Close(); qg,Nb  
  nCount++; zXc}W*ymj  
 } xQt 3[(Z  
 GlobalFreePtr(lpData); a}.Y!O&  
 if(nCount==1)  ?)tK!'  
  m_Number.Format("%d picture captured.",nCount); E1>/R  
 else m[2'd  
  m_Number.Format("%d pictures captured.",nCount); S-E++f9D~  
  UpdateData(FALSE); 6 o[/F3`  
} ,&a`d}g&G  
"2HY5 AE  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 4?]oV%aP)  
{ T<jfAE  
 if(pMsg -> message == WM_KEYDOWN) wFlV=!>,  
 { DOL%'k?B  
  if(pMsg -> wParam == VK_ESCAPE) Sw! j=`O  
   return TRUE; & QZVq"  
  if(pMsg -> wParam == VK_RETURN) m=&j@  
   return TRUE; , &' Y  
 } =v"xmx&4  
 return CDialog::PreTranslateMessage(pMsg); _GbE ^  
} Ht=$] Px  
1 ycc5=.  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |PM m?2^R  
{ j.c8}r&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ L]zNf71RD  
  SaveBmp(); a20w,  
  return FALSE; 4'At.<]jL  
} LR$z0rDEM  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ E5x]zXy4  
 CMenu pop; .1ddv4Hk  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); >,g5Hkmqr  
 CMenu*pMenu=pop.GetSubMenu(0); N <pbO#e  
 pMenu->SetDefaultItem(ID_EXITICON); StM/  
 CPoint pt; {Jx7_T&  
 GetCursorPos(&pt); 8&a_A:h  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ,hE/II`-d'  
 if(id==ID_EXITICON) M9V-$ _)  
  DeleteIcon(); -l.pA(O  
 else if(id==ID_EXIT) y1(P<7:t?  
  OnCancel(); ujx-jIhT_  
 return FALSE; _5\AS+[x  
} ^L O]Z  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 3YTIH2z 5  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 5 ;vC(Go  
 AddIcon(); 8gpBz'/,  
 return res; Tt6{WDscZ  
} r>3^kL5UI  
TU%"jb5  
void CCaptureDlg::AddIcon() 0^\/ERK  
{ QAaF@Do  
 NOTIFYICONDATA data; ;6<zjV7}  
 data.cbSize=sizeof(NOTIFYICONDATA); +sn2Lw!^  
 CString tip; u_'nOle K  
 tip.LoadString(IDS_ICONTIP); G\mKCaI8  
 data.hIcon=GetIcon(0);  <qn,  
 data.hWnd=GetSafeHwnd(); H'Iq~Ft1  
 strcpy(data.szTip,tip); HU[oR4E  
 data.uCallbackMessage=IDM_SHELL; 0!IPcZjY7  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 5^|"_Q#:  
 data.uID=98; ]GS ~i+=M  
 Shell_NotifyIcon(NIM_ADD,&data); RSH/l;ii  
 ShowWindow(SW_HIDE); 1jOKcm'#  
 bTray=TRUE; 8?Wgawx  
} |4xo4%BQ>  
4hNwKe"Ki  
void CCaptureDlg::DeleteIcon() aiR5/ ZD  
{ $n*%v85  
 NOTIFYICONDATA data; &l!$Sw-u;  
 data.cbSize=sizeof(NOTIFYICONDATA); "z/V%ZK~f  
 data.hWnd=GetSafeHwnd(); ;vUxO<cKFq  
 data.uID=98; ^n71'MW  
 Shell_NotifyIcon(NIM_DELETE,&data); <UAP~RH{  
 ShowWindow(SW_SHOW); QE6El'S  
 SetForegroundWindow(); }@*I+\W/  
 ShowWindow(SW_SHOWNORMAL); foyB{6q8  
 bTray=FALSE; {*__B} ,N  
} 3B"7VBK{  
.WO/=# O  
void CCaptureDlg::OnChange() 4@~a<P#  
{ qp1\I$Y  
 RegisterHotkey(); 4f jC  
} :tlE`BIp  
1*#bfeoM  
BOOL CCaptureDlg::RegisterHotkey() CSH`pU  
{ ;r@!a!NLB  
 UpdateData(); _jDS"  
 UCHAR mask=0; 4[_L=zD  
 UCHAR key=0; 4zX=3iBt  
 if(m_bControl) Q%M_   
  mask|=4; Dpj-{q7C  
 if(m_bAlt) ]F_r6*<  
  mask|=2; :Fo4O'UC  
 if(m_bShift) Uir*%*4:  
  mask|=1; ?+Hp?i$1  
  key=Key_Table[m_Key.GetCurSel()]; kXCY))vnn  
 if(bRegistered){ )DRkS,I  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 4n4j=x]@  
  bRegistered=FALSE; \AHY[WKx  
 } ,M{Q}:$+4  
 cMask=mask; Rj&qh`  
 cKey=key; 'oCm.~;_  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 2b!j.T#u  
 return bRegistered; *k!(ti[  
} RCCv>o  
&! OGIYC(  
  四、小结 BP:(IP!&  
CX.SYr&!R  
  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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