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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: J!(<y(l  
  gZXi]m&  
  一、实现方法 L`TLgH&?R  
U '_Q>k  
  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: r Z$O?K  
Of#u  
#pragma data_seg("shareddata") +TL%-On  
HHOOK hHook =NULL; //钩子句柄 4F:\-O  
UINT nHookCount =0; //挂接的程序数目 K@]4g49A/j  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 T&bY a`f]  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Dml;#'IF3  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey #:_Kws>+  
static int KeyCount =0; G~a ZJ,  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Dx?,=~W9  
#pragma data_seg() JXQO~zj  
RbnVL$c  
  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。 ,[KD,)3y  
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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: vh%B[brUJ  
nR~@#P\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR T?0eVvM  
cKey,UCHAR cMask) BDDlQci38  
{ O0v}43J [  
 BOOL bAdded=FALSE; F/{!tx  
 for(int index=0;index<MAX_KEY;index++){ T'9'G M  
  if(hCallWnd[index]==0){ Sz`,X0a  
   hCallWnd[index]=hWnd; RtS+<^2a;  
   HotKey[index]=cKey; ? OM!+O  
   HotKeyMask[index]=cMask; 1CZgb   
   bAdded=TRUE; <'oQ \eB  
   KeyCount++; /{_:{G!Q0  
   break; IEi^kJflU  
  } B9z?mt'|r)  
 } JH9J5%sp  
 return bAdded; S%>]q s  
} 0s[Hkhls  
//删除热键 + &Eqk  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) iYoMO["X  
{ 7JH6A'&  
 BOOL bRemoved=FALSE; LEdh!</'24  
 for(int index=0;index<MAX_KEY;index++){ ZLejcYS  
  if(hCallWnd[index]==hWnd){ ouQ T  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ k4;7<j$ir  
    hCallWnd[index]=NULL; ~36!?&eA8  
    HotKey[index]=0; g3y~bf  
    HotKeyMask[index]=0; @": ^)87  
    bRemoved=TRUE; tyFzSrfc  
    KeyCount--; ^n z.j  
    break; rb.N~  
   } $U WZDD  
  } 6bC3O4Rw  
 } _`T_">9r  
 return bRemoved; -Q*gW2KmV  
} 5t]H?b8  
I\ob7X'Xu!  
4D4j7  
  DLL中的钩子函数如下: Y:[u1~a  
W${Ue#w77  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) L="}E rmK  
{ a`>B Ly5o  
 BOOL bProcessed=FALSE; TvbE2Q;/UL  
 if(HC_ACTION==nCode) /J;Kn]5e  
 { ZFL~;_r  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 )y$(AJx$  
   switch(wParam) ON(kt3.h  
   {   qX{+oy5  
    case VK_MENU: F JyT+  
     MaskBits&=~ALTBIT; q_58;Bv  
     break; (!WD1w   
    case VK_CONTROL: nNn :-  
     MaskBits&=~CTRLBIT; kffcm/  
     break; ~]2K ^bh8&  
    case VK_SHIFT: ~9@UjQ^)F  
     MaskBits&=~SHIFTBIT; kxv1Hn"`{E  
     break; b ]KBgZ  
    default: //judge the key and send message %'pgGC"|  
     break; FZn w0tMq  
   } 3!]rmZ-W  
   for(int index=0;index<MAX_KEY;index++){ xA*<0O\V  
    if(hCallWnd[index]==NULL) > ~O.@|  
     continue; Gd85kY@w7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) JWxwJex  
    { gPPkT"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ym1Y4,  
     bProcessed=TRUE;  @q) d  
    } P&Vv/D  
   } nu%*'.  
  } wibNQ`4k  
  else if((lParam&0xc000ffff)==1){ //有键按下 j3Y['xDv  
   switch(wParam) |sE'XT4ag  
   { =I_'.b  
    case VK_MENU: w}L[u r;I_  
     MaskBits|=ALTBIT; S f# R0SA  
     break; eaU  
    case VK_CONTROL: p`qgrI`  
     MaskBits|=CTRLBIT; ?:0Jav  
     break; sYA1\YIii  
    case VK_SHIFT: BI@[\aRLQ  
     MaskBits|=SHIFTBIT; S_H+WfIHV'  
     break; dR]m8mdqc1  
    default: //judge the key and send message pQB."[n  
     break; h<QY5=S F  
   } V0mn4sfs  
   for(int index=0;index<MAX_KEY;index++){ ]`WJOx4  
    if(hCallWnd[index]==NULL) 1'8YkhQ2a  
     continue; Nh +H9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5z)~\;[ -  
    { }Q+|W=2t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); N;%6:I./  
     bProcessed=TRUE; F#E3q|Q"BS  
    } @=u3ZVD  
   } JucY[`|JV  
  } y@yD5$/  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 8&dF  
   for(int index=0;index<MAX_KEY;index++){ ]Hv[IodJ  
    if(hCallWnd[index]==NULL) GQ ;;bcj&  
     continue; qH_Dc=~la  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) "m>81-0  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); u*9V&>o  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 rytyw77t(  
   } 1o>xEWt:0K  
  } veECfR;  
 } 47/iF97  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); tZo} ;|~'  
} u ^RxD^=L  
LDa1X2N  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: GC'O[q+  
alb.g>LNPP  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); TA~{1_l  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `Q,H|hp;k;  
*VN6cSq  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: a8Wwq?@  
xgtR6E^k  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }Y4qS  
{ -UT}/:a  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) HxI" 8A  
 { sDV Q#}a  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 V(*(F7+  
  SaveBmp(); cB&:z)i4  
  return FALSE; 7 X4LJf  
 } poFg 1  
 …… //其它处理及默认处理 32 =z)]FZ  
}  9gZ$   
P!k{u^$L  
5@W j>:w  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 kG*~ |ma  
NGWxN8P6  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 / XIhj  
+ck}l2&#  
  二、编程步骤 FN73+-:n:j  
i}?>g-(  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; QmIBaMI#  
Z?z.?a r  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ? =+WRjF  
E_LN]v  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; I2Yz#V<%ru  
Z/J y'$x  
  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; dgePPhj  
T[A 69O]v  
  5、 添加代码,编译运行程序。 Ga'swP=hf  
<9 ;!3xG  
三、程序代码 {l >hMxij  
jZ; =so  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Y6d@h? ht  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) qIqM{#' ^  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ a.6(K  
#if _MSC_VER > 1000 @=kSo -SX  
#pragma once as=LIw}Q4  
#endif // _MSC_VER > 1000 %~S&AE-  
#ifndef __AFXWIN_H__ DlNX 3  
#error include 'stdafx.h' before including this file for PCH igAtRX%Qx  
#endif _J[P[(ab  
#include "resource.h" // main symbols xkR0  
class CHookApp : public CWinApp hR|MEn6KC  
{ >F&47Yn  
 public:  8dyg1F  
  CHookApp(); wlmRe`R  
  // Overrides {]|J5Dgfe  
  // ClassWizard generated virtual function overrides 0SPk|kr  
  //{{AFX_VIRTUAL(CHookApp) dcT80sOC  
 public: j <RrLn_  
  virtual BOOL InitInstance(); _<2E"PrT   
  virtual int ExitInstance(); G*v,GR  
  //}}AFX_VIRTUAL }o{(S%%  
  //{{AFX_MSG(CHookApp) c[Zje7 @  
  // NOTE - the ClassWizard will add and remove member functions here. KY] C6kh  
  // DO NOT EDIT what you see in these blocks of generated code ! N,U8YO  
  //}}AFX_MSG ;jTN | i'  
  DECLARE_MESSAGE_MAP() 9~YMyg(Z  
}; O|UC ?]6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); >-{Hyx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !0E&@X:-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); WOf 4o  
BOOL InitHotkey(); 7J&4akT{9  
BOOL UnInit(); SK.: Q5:  
#endif pY$Q  
<b<j=_3  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. GowH]MO  
#include "stdafx.h" [PKR2UEe]  
#include "hook.h" >&#)Tqt!?  
#include <windowsx.h> H 7 ^/q7  
#ifdef _DEBUG D|#E9OQzs  
#define new DEBUG_NEW uSBa DYg  
#undef THIS_FILE T9q-,w/j;  
static char THIS_FILE[] = __FILE__; W`*r>`krVJ  
#endif 1g~R/*Jo  
#define MAX_KEY 100 S`?!G&[!>  
#define CTRLBIT 0x04 9Lfv^V0  
#define ALTBIT 0x02 5nVt[Puw  
#define SHIFTBIT 0x01 '$QB$2~V  
#pragma data_seg("shareddata") G9@0@2aY8  
HHOOK hHook =NULL; @AuO`I@p=  
UINT nHookCount =0; ?b5 ^  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey !$>R j  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Nl(Foya%)  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey VOh4#%Vj  
static int KeyCount =0; @$K"o7+]   
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift F1Bq$*'N$w  
#pragma data_seg() _t}WsEQ+P  
HINSTANCE hins; 5+ MS^H  
void VerifyWindow(); $ o#V#  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 8SS|a  
//{{AFX_MSG_MAP(CHookApp) h3@v+Z<}  
// NOTE - the ClassWizard will add and remove mapping macros here. HiJE}V;Vq  
// DO NOT EDIT what you see in these blocks of generated code! P}`H ~N~  
//}}AFX_MSG_MAP B^jc3 VsR  
END_MESSAGE_MAP() fa2kG&, _  
S`m]f5u|  
CHookApp::CHookApp() BJo*'US-Q  
{ mU9kVx1+  
 // TODO: add construction code here, ^L&iR0  
 // Place all significant initialization in InitInstance jOD?|tK&  
} ib791  
xFg>SJ7]  
CHookApp theApp; wo 5   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) SOvF[,+  
{ dN[\xVcj  
 BOOL bProcessed=FALSE; 1 I",L&S1  
 if(HC_ACTION==nCode) Ef13Q]9|  
 { 0Z]!/AsC  
  if((lParam&0xc0000000)==0xc0000000){// Key up YkQd  
   switch(wParam) eO[b1]WLP  
   { (0kK_k'T  
    case VK_MENU: @2v_pJy^  
     MaskBits&=~ALTBIT; =rX>1  
     break; IRqy%@)  
    case VK_CONTROL: 9490o:s  
     MaskBits&=~CTRLBIT; X+]G-  
     break; 3%=~) 7cF  
    case VK_SHIFT: zT?D<XW>1  
     MaskBits&=~SHIFTBIT; DrK{}uM  
     break; y Fq&8 x<X  
    default: //judge the key and send message ;@E$}*3[>V  
     break; LvYB7<zk>  
   } -!]ZMi9  
   for(int index=0;index<MAX_KEY;index++){ ?p8_AL'RS  
    if(hCallWnd[index]==NULL) J`1rJ  
     continue; V,N%;iB}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t}tEvh  
    { `&6dnSC},P  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); K8Y=S12Ti  
     bProcessed=TRUE; 4)o  
    } $\y'I Q%  
   } gjzuG< 7m  
  } x;<W&s}(  
  else if((lParam&0xc000ffff)==1){ //Key down CYYU 7  
   switch(wParam) Uq`'}Vo  
   { 2WYPO"q  
    case VK_MENU: fvxu#m=  
     MaskBits|=ALTBIT; :tv,]05t  
     break; C'}KTXiRW  
    case VK_CONTROL: W#3Q ^Z?  
     MaskBits|=CTRLBIT; v^+Sh|z/  
     break; "AGLVp.zT  
    case VK_SHIFT: Bo%NFB;  
     MaskBits|=SHIFTBIT; ]~hk6kS8Q  
     break; !0mI;~q|F  
    default: //judge the key and send message  U}j0D2  
     break; ,:\|7F  
   } TT3|/zwn  
   for(int index=0;index<MAX_KEY;index++) \d$!a5LF}  
   { mF^v~  
    if(hCallWnd[index]==NULL) _n>,!vH  
     continue; AbmAKA@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) EG |A_m85  
    { e.V:)7Uc  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ^eYVWQ'  
     bProcessed=TRUE; LTx,cP  
    } 0F><P?5  
   } \.#>=!Ie  
  } )U{Qj5W+F  
  if(!bProcessed){ _~iw[*#u  
   for(int index=0;index<MAX_KEY;index++){ SQt 4v"  
    if(hCallWnd[index]==NULL) N7R!C)!IL  
     continue; ChXq4]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #" iu| D  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); [-oc>; `=l  
   } AX/m25x  
  } w!clI8v/  
 } Z Sd4z:/  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Pce;r*9  
} i9][N5\$  
t"/q]G5  
BOOL InitHotkey() l$bu%SZ  
{ #';:2Nyq  
 if(hHook!=NULL){ xbYi.  
  nHookCount++; dT1H  
  return TRUE; 0T5L_%c  
 } Y#$%iF  
 else B%+T2=&$7  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); IG9VdDj  
  if(hHook!=NULL) ~|xA4u5LG  
   nHookCount++; yhA6i  
  return (hHook!=NULL); M%;hB*9  
} L.0mk_&  
BOOL UnInit() ]G< Vg5  
{ a]tVd#  
 if(nHookCount>1){ Px`!A EFd[  
  nHookCount--; ':m,)G5&  
  return TRUE; ly3\e_z:G  
 } HcSXsF  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Y,t={HiclX  
 if(unhooked==TRUE){ ,0HRAmG  
  nHookCount=0; F,)%?<!I  
  hHook=NULL; j*TYoH1  
 } __GqQUQ  
 return unhooked; VUR|OV%  
} |02gupqqi  
i|*)I:SHU  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ocS5SB]8  
{ \<TXS)w]  
 BOOL bAdded=FALSE; G..aiA  
 for(int index=0;index<MAX_KEY;index++){ 0o*8#i/)!3  
  if(hCallWnd[index]==0){ 6-B|Y3)B  
   hCallWnd[index]=hWnd; ):_\;.L  
   HotKey[index]=cKey; _1!OlQ  
   HotKeyMask[index]=cMask; HLaRGN3,  
   bAdded=TRUE; (7=!+'T"  
   KeyCount++; RxWVe-Dg  
   break; K':;%~I  
  } o@i#|kx,  
 } +8d1|cB"  
 return bAdded; vbe|hO""  
} 6?~"V  
G@jZ)2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :~N-.#  
{ ly_HWuFJ3  
 BOOL bRemoved=FALSE; 3H6lBF  
 for(int index=0;index<MAX_KEY;index++){ Bj-: #P@  
  if(hCallWnd[index]==hWnd){ _k ~KZ;l  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ l &5QZI0I  
    hCallWnd[index]=NULL; b:]V`uF?  
    HotKey[index]=0; T\j{Bi5 \J  
    HotKeyMask[index]=0; 8jo p_PG'  
    bRemoved=TRUE; 90*5 5\>{  
    KeyCount--; Y U5(g^<  
    break; J!pygn O  
   } rb+j*5Es  
  } =wOm}V8 N&  
 } OGg>#vj,s  
 return bRemoved; po Vx8oO8  
} OO*zhGD;[  
d,Yw5$i  
void VerifyWindow() P&ptJtNg  
{ RM]M@%,K  
 for(int i=0;i<MAX_KEY;i++){ B s#hr3h-  
  if(hCallWnd!=NULL){ .|b$NM  
   if(!IsWindow(hCallWnd)){ K<ft2anY5  
    hCallWnd=NULL; K<qk.~ S  
    HotKey=0; +:!7L= N#  
    HotKeyMask=0; 27O|).yKX  
    KeyCount--; @ H7d_S  
   } F{~{Lthc  
  } ,UGRrS  
 } %r}{hq4  
} bITPQ7+  
KZ ;k)O.Ov  
BOOL CHookApp::InitInstance() ,J^b0@S  
{ ;=; 9tX  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); {rH@gz|@i  
 hins=AfxGetInstanceHandle(); :LRYYw  
 InitHotkey();  SVs_dG$  
 return CWinApp::InitInstance(); 6NM:DI\%  
} c[4i9I3v  
`e|0g"oP  
int CHookApp::ExitInstance() <vh/4  
{ ( b~T]3Es  
 VerifyWindow(); 6ZG+ZHUC&  
 UnInit(); !1DKLQ  
 return CWinApp::ExitInstance(); =JbRu|/  
} %GA"GYL9'  
evAMJ=  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file -Rd/G x  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) QWSTR\!  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ UT=tT )4b  
#if _MSC_VER > 1000 (@<c6WS  
#pragma once ]?+p5;{y4  
#endif // _MSC_VER > 1000 !K}~/9Z=m  
(ehK?6[  
class CCaptureDlg : public CDialog `W:%mJd9  
{ >x+6{^}Q>  
 // Construction o` ZQd,3  
 public: Avd ^  
  BOOL bTray; )d1_Wm#B  
  BOOL bRegistered; ,PuL{%PXu  
  BOOL RegisterHotkey(); r1.nTO%  
  UCHAR cKey; zHL@i0>^  
  UCHAR cMask; ICs\ z  
  void DeleteIcon(); "2P&X  
  void AddIcon(); WEQ1 Seq  
  UINT nCount; +HeTtFo{M  
  void SaveBmp(); /F-qP.<D,r  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ;":zkb{  
  // Dialog Data */|lJm'R  
  //{{AFX_DATA(CCaptureDlg) -o[x2u~n\  
  enum { IDD = IDD_CAPTURE_DIALOG }; =;3Sx::=  
  CComboBox m_Key; 7/ysVWt  
  BOOL m_bControl; PMh^(j[  
  BOOL m_bAlt; m-*i>4;  
  BOOL m_bShift; 6@e+C;j =  
  CString m_Path; 8U>B~9:JO  
  CString m_Number; L[H5NUG!  
  //}}AFX_DATA KJ=6n%6  
  // ClassWizard generated virtual function overrides ^xHTWg%9  
  //{{AFX_VIRTUAL(CCaptureDlg) v'qG26  
 public: Co9QW/'i  
  virtual BOOL PreTranslateMessage(MSG* pMsg); hMUs" <.  
 protected: V_RTI.3p  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dC $Em@Nb  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); d`nVc50  
  //}}AFX_VIRTUAL XZJ+h,f  
  // Implementation M?:c)&$]D  
 protected: OK6] e3UO  
  HICON m_hIcon; ;04Ldb1{|3  
  // Generated message map functions e8]\U/  
  //{{AFX_MSG(CCaptureDlg) 8V)^R(\;  
  virtual BOOL OnInitDialog(); r>"   
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 7_Z#m (  
  afx_msg void OnPaint(); F\AX :  
  afx_msg HCURSOR OnQueryDragIcon(); 04'~ta(t  
  virtual void OnCancel(); 'wI"Bo6e  
  afx_msg void OnAbout(); ll6wpV0m  
  afx_msg void OnBrowse(); B}:(za&  
  afx_msg void OnChange(); ]2'na?q9  
 //}}AFX_MSG HATA-M  
 DECLARE_MESSAGE_MAP() gb> }v7  
}; 6morum  
#endif 2f:Eof(B  
}i`PGx  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file {Jx4xpvPo  
#include "stdafx.h" gu<'QV"  
#include "Capture.h" ("+}=*?OF3  
#include "CaptureDlg.h" kc @[9eV  
#include <windowsx.h> zG9Y!SY\-  
#pragma comment(lib,"hook.lib") !n$tr  
#ifdef _DEBUG AvSM ^  
#define new DEBUG_NEW .J.-Mm` .  
#undef THIS_FILE I1\a[Xe8E  
static char THIS_FILE[] = __FILE__; T ;vF(  
#endif GXjfQ~<]  
#define IDM_SHELL WM_USER+1 Y&_&s7z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); NqEA4C  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dBe`p5Z  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; oiyzHx  
class CAboutDlg : public CDialog Tp?y8r  
{ x.zbD8l/9  
 public: R~jHr )0.#  
  CAboutDlg(); IS[thbzkZ  
  // Dialog Data ./D$dbu3  
  //{{AFX_DATA(CAboutDlg) IlE_@gS8  
  enum { IDD = IDD_ABOUTBOX }; ]Xf% ,iu  
  //}}AFX_DATA (85Fv&a  
  // ClassWizard generated virtual function overrides IWveW8qJ  
  //{{AFX_VIRTUAL(CAboutDlg) E3l> 3  
 protected: _~tEw.fM5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0=q;@OIf  
  //}}AFX_VIRTUAL `|#Qx3n%  
  // Implementation RE=+ Dz{  
 protected: S.Ma$KL~'^  
  //{{AFX_MSG(CAboutDlg) OY5OJ*   
  //}}AFX_MSG Wg0g/  
  DECLARE_MESSAGE_MAP() Ns0cgCrhX  
}; wm")[!h)v  
WN5`;{\  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) bi&*9K0  
{ HXYRH  
 //{{AFX_DATA_INIT(CAboutDlg) A"l?:?rtw]  
 //}}AFX_DATA_INIT r"a5(Q;n  
} vZ N!Zl7S  
+1!qs,  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) kbfC|5S  
{ *^wB!{.#  
 CDialog::DoDataExchange(pDX); {^rs#, W  
 //{{AFX_DATA_MAP(CAboutDlg) k`9)=&zX+  
 //}}AFX_DATA_MAP `S.ZS}~!F  
} )0e2ic/  
d]i(h~?_  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) RUUk f({(  
 //{{AFX_MSG_MAP(CAboutDlg) O Xi@c;F  
 // No message handlers sf|ke9-3  
 //}}AFX_MSG_MAP ZP$-uaa-  
END_MESSAGE_MAP() ND,Kldji  
zBp{K@U[|M  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) UMp/ \&0  
: CDialog(CCaptureDlg::IDD, pParent) A@D2+fS  
{ 3 M10fI?  
 //{{AFX_DATA_INIT(CCaptureDlg) 8kt5KnD2  
  m_bControl = FALSE; Ev2HGU[  
  m_bAlt = FALSE; }%`~T>/  
  m_bShift = FALSE; )T66<UDK|  
  m_Path = _T("c:\\"); #nO|A\N  
  m_Number = _T("0 picture captured."); j.ldaLdG  
  nCount=0; kR@Yl Yo  
  bRegistered=FALSE; 7Irau_  
  bTray=FALSE; o/ mF #  
 //}}AFX_DATA_INIT :BukUket1e  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 he-Ji  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); + "}=d3E6  
} q4$+H{xB  
F3lw@b3])  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) F@!Td(r2  
{ qG/fE'(j&  
 CDialog::DoDataExchange(pDX); pdb1GDl0q  
 //{{AFX_DATA_MAP(CCaptureDlg) CGP3qHrXt  
  DDX_Control(pDX, IDC_KEY, m_Key); Bo+DJizu  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); _l], "[d  
  DDX_Check(pDX, IDC_ALT, m_bAlt); a=$t&7;,  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); gx:;&4AD  
  DDX_Text(pDX, IDC_PATH, m_Path); lvpc*d|K  
  DDX_Text(pDX, IDC_NUMBER, m_Number); X$\i{p9jw  
 //}}AFX_DATA_MAP fiI $T:g.  
} w[-Fm+A>  
e{9jn>\,a  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) j! NO|&k  
//{{AFX_MSG_MAP(CCaptureDlg) -/dEsgO  
 ON_WM_SYSCOMMAND() C4#rA.nF|  
 ON_WM_PAINT() &Q=ZwC7#  
 ON_WM_QUERYDRAGICON() omf  Rs  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) H{c?lT  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) dj&}Gedy  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ZC 4*{  
//}}AFX_MSG_MAP iH2n.M "  
END_MESSAGE_MAP() |nk3^;Yf  
l\!-2 T6Y  
BOOL CCaptureDlg::OnInitDialog() ]G}B 0u3  
{ 's!-80sd  
 CDialog::OnInitDialog(); ExXM:1 e26  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _uu<4c   
 ASSERT(IDM_ABOUTBOX < 0xF000); cj|*_}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); W"xP(7X  
 if (pSysMenu != NULL) NO K/<_/  
 { HFQR ;9]  
  CString strAboutMenu; rJ'I>Q~x6  
  strAboutMenu.LoadString(IDS_ABOUTBOX); o:dR5v  
  if (!strAboutMenu.IsEmpty()) i=32KI(%  
  { V' 2EPYB  
   pSysMenu->AppendMenu(MF_SEPARATOR); }T0K^Oe+eS  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); p(m1O70 C  
  } qy!Ou3^  
 } -(JUd4#  
 SetIcon(m_hIcon, TRUE); // Set big icon zMK](o1Vj  
 SetIcon(m_hIcon, FALSE); // Set small icon iG ,t_??  
 m_Key.SetCurSel(0); - ?!:{UXl  
 RegisterHotkey(); $O:w(U  
 CMenu* pMenu=GetSystemMenu(FALSE); 68'>Zbelb  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); QI[}(O7#6  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); .2\0~x""  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 4oXbPr>  
 return TRUE; // return TRUE unless you set the focus to a control TE-;X,gDV_  
} ) I@L+  
$H'X V"<o  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |\uYv|sT  
{ VnJMmMM  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) "x&C5l}n  
 { Px'!;  
  CAboutDlg dlgAbout; F[7x*-NO-  
  dlgAbout.DoModal(); bT!($?GNdg  
 } snp v z1iS  
 else d2ENm%q*PX  
 { [{<dbW\ 9  
  CDialog::OnSysCommand(nID, lParam); 6a>H|"P NE  
 } E)t  
} 4R) |->"  
<3O T>E[  
void CCaptureDlg::OnPaint() "!Rw)=7O  
{ IdRdW{o  
 if (IsIconic()) FF Gqa&  
 { nyT[^n  
  CPaintDC dc(this); // device context for painting zyN (4  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); EZ(^~k=I  
  // Center icon in client rectangle }Ewo_P&`  
  int cxIcon = GetSystemMetrics(SM_CXICON); SLk2X;c]o  
  int cyIcon = GetSystemMetrics(SM_CYICON); )3z]f2  
  CRect rect; dyFKxn`,  
  GetClientRect(&rect); qG >DTKIU  
  int x = (rect.Width() - cxIcon + 1) / 2; I8op>^N"  
  int y = (rect.Height() - cyIcon + 1) / 2; C@HD(..#  
  // Draw the icon c 8QnN:n  
  dc.DrawIcon(x, y, m_hIcon); -Ubj6 t_K  
 } .1*DR]^`  
 else R+$8w2#  
 { GG'Sp53GE  
  CDialog::OnPaint(); 7-9;PkGG.A  
 } ^4`&EF  
} _& 4its  
^ZQCIS-R  
HCURSOR CCaptureDlg::OnQueryDragIcon() LE c8NQs  
{ DQ=N1pft2v  
 return (HCURSOR) m_hIcon; A@$fb}CF  
} iIU( C.I  
%N~C vN@T  
void CCaptureDlg::OnCancel() VVrwOo CN  
{ e.6Dl_  
 if(bTray) 6|;0ax4:P  
  DeleteIcon(); `f'C[a"  
  CDialog::OnCancel(); fEu9Jk  
} +>3]%i- \  
It 2UfW  
void CCaptureDlg::OnAbout() qZ G-Lh  
{ 4&}\BU*  
 CAboutDlg dlg; dB|Te"6  
 dlg.DoModal(); r2G*!qK*1  
} S[@6Lp3q_  
9|K*G~J  
void CCaptureDlg::OnBrowse() ':;LrTc'K  
{ Ww87  
 CString str; q?VVYZXP  
 BROWSEINFO bi; B {i&~k  
 char name[MAX_PATH]; Tj,Nmb>Q7'  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); g+Ph6W  
 bi.hwndOwner=GetSafeHwnd(); h1%y:[_  
 bi.pszDisplayName=name; uU+s!C9r  
 bi.lpszTitle="Select folder"; O=O(3Pf>  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; -"Gl 4)  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); L/k40cEI^z  
 if(idl==NULL) WX*cICb5  
  return; mvf _@2^  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); hrlCKL&  
 str.ReleaseBuffer(); 712=rUI%!  
 m_Path=str; c57bf  
 if(str.GetAt(str.GetLength()-1)!='\\') S_!R^^ySG9  
  m_Path+="\\"; s}b*5@8|tA  
 UpdateData(FALSE); 4ROWz  
} CSL4P)  
*!u?  
void CCaptureDlg::SaveBmp() gLCz]D.'  
{ $T)d!$  
 CDC dc; vXPuyR<J  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); F> Mr<k=@;  
 CBitmap bm; #6FaIq92V  
 int Width=GetSystemMetrics(SM_CXSCREEN); ECdfLn*c  
 int Height=GetSystemMetrics(SM_CYSCREEN); QBjY&(vY  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ;^.9#B,<  
 CDC tdc; /2:Q6J  
 tdc.CreateCompatibleDC(&dc); cJq<9(  
 CBitmap*pOld=tdc.SelectObject(&bm); |\p5mh  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); anitqy#E  
 tdc.SelectObject(pOld); xXa#J)'  
 BITMAP btm; #HcI4j:s!  
 bm.GetBitmap(&btm); )9pBu B  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; s@M  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); kOM-  
 BITMAPINFOHEADER bih; H5^Y->  
 bih.biBitCount=btm.bmBitsPixel; & 3I7]Wm  
 bih.biClrImportant=0; sRil>6QR  
 bih.biClrUsed=0; i0&) N,5_  
 bih.biCompression=0; %~(~W>^A  
 bih.biHeight=btm.bmHeight; n1`T#%e  
 bih.biPlanes=1; 9t\ [N/  
 bih.biSize=sizeof(BITMAPINFOHEADER); &1$8q0  
 bih.biSizeImage=size; $pBr &,  
 bih.biWidth=btm.bmWidth; ^k9rDn/AW  
 bih.biXPelsPerMeter=0; K-Y* T}?  
 bih.biYPelsPerMeter=0; $U mE  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); h=wf>^l  
 static int filecount=0; `QAh5r"  
 CString name; |=OpzCs  
 name.Format("pict%04d.bmp",filecount++); b2%blQgo  
 name=m_Path+name; "] 9_Fv  
 BITMAPFILEHEADER bfh; .hnF]_QQ  
 bfh.bfReserved1=bfh.bfReserved2=0; .kzms  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 9w$7VW;  
 bfh.bfSize=54+size; a:xgjUt&5  
 bfh.bfOffBits=54; {N@Y<=+:  
 CFile bf; JbVi1?c  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 6A@Lj*:2m  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); VG#$fRrZ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); :EaiM J_=  
  bf.WriteHuge(lpData,size); {C,  #rj  
  bf.Close(); nR#a)et  
  nCount++; a#6,#Q"  
 } A9.;>8!u  
 GlobalFreePtr(lpData); 92NC]_jw  
 if(nCount==1) -q|*M:R  
  m_Number.Format("%d picture captured.",nCount); | )S{(#k  
 else |<7i|J  
  m_Number.Format("%d pictures captured.",nCount); >T$7{ ~  
  UpdateData(FALSE); 3# :EK M~!  
} 2tlO"c:_/  
'NRN_c9  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) G:){^Z?  
{ w-8)YJ Y  
 if(pMsg -> message == WM_KEYDOWN) -{r!M(47  
 { aSxG|OkKy  
  if(pMsg -> wParam == VK_ESCAPE) Ny[s+2?  
   return TRUE; "Vq@bNtu+  
  if(pMsg -> wParam == VK_RETURN) y>&VtN{E  
   return TRUE; )<tzm'Rc  
 } 8:BQHYeJK  
 return CDialog::PreTranslateMessage(pMsg); !4!S{#<q  
} 6#/LyzZq|  
3 pHn_R  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) U &f#V=Rg  
{ CJtr0M<U+  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \_)02ZT:  
  SaveBmp(); ]r]+yM|  
  return FALSE; -y9Pn>~V  
} MH2OqiCI  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <m:4g ,6  
 CMenu pop; >J?jr&i  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); {[rO2<MkA#  
 CMenu*pMenu=pop.GetSubMenu(0); 939]8BERt  
 pMenu->SetDefaultItem(ID_EXITICON); Ig='a"%  
 CPoint pt; hu`L v  
 GetCursorPos(&pt); Fj36K6!#?  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 'XG:1Bpm  
 if(id==ID_EXITICON) h7)VJY  
  DeleteIcon(); 6Eij>{v  
 else if(id==ID_EXIT) FDZeIj9uF  
  OnCancel(); -+`az)lrp  
 return FALSE; m.|qVN  
} &8o  :  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 'bbV<? ):  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) nDwq!LEx%5  
 AddIcon(); ,Uv{dG  
 return res; {EZFx,@t  
} {A !;W  
CAA tco5  
void CCaptureDlg::AddIcon()  [ ((h<e  
{ ~k"eE V p  
 NOTIFYICONDATA data; {.0X[uAf  
 data.cbSize=sizeof(NOTIFYICONDATA); pXGK:ceFu  
 CString tip; `S uS)RhA)  
 tip.LoadString(IDS_ICONTIP); e@6RC bj  
 data.hIcon=GetIcon(0); 8b8e^\l(  
 data.hWnd=GetSafeHwnd(); {-:4O\/  
 strcpy(data.szTip,tip); wi![0IE )  
 data.uCallbackMessage=IDM_SHELL; ~Tpe,juG_  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; n$}R/*  
 data.uID=98; I 0x`H)DA  
 Shell_NotifyIcon(NIM_ADD,&data); \a9D[wk;@  
 ShowWindow(SW_HIDE); OcyiL)tv5  
 bTray=TRUE; ..v@Q%  
} Xq} n^W  
Qq @_Z=mt  
void CCaptureDlg::DeleteIcon() tRpL0 =y  
{ KY;uO 8Te  
 NOTIFYICONDATA data; 7<Z~\3x  
 data.cbSize=sizeof(NOTIFYICONDATA); g]oc(RM  
 data.hWnd=GetSafeHwnd(); $X{B* WF  
 data.uID=98; nph7&[xQI  
 Shell_NotifyIcon(NIM_DELETE,&data); :e5:\|5*5  
 ShowWindow(SW_SHOW); z_)OWWdN  
 SetForegroundWindow(); >e5q2U   
 ShowWindow(SW_SHOWNORMAL); ^!-E`<jW8  
 bTray=FALSE; tU-#pB>H  
} ui0J}DM  
z&6]vN'  
void CCaptureDlg::OnChange() n0>5'm%ES  
{ YL0WUD_>  
 RegisterHotkey(); 1( QWt  
} E.En$'BvB  
gdkLPZ<<  
BOOL CCaptureDlg::RegisterHotkey() ySPlyhGF  
{ WOe{mwhhj  
 UpdateData(); 24.7S LXO  
 UCHAR mask=0; <s59OdzP  
 UCHAR key=0; bahc{ZC2  
 if(m_bControl) T<9dW?'|  
  mask|=4; kHz+ ZY<?  
 if(m_bAlt) 62k9"xSH  
  mask|=2; '? !7 Be  
 if(m_bShift) k:(e79  
  mask|=1; xIq"[?m  
  key=Key_Table[m_Key.GetCurSel()]; M+;!]tbc3  
 if(bRegistered){ Q8M:7#ySji  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); w|K(>5nz  
  bRegistered=FALSE; %nG~u,_2f  
 } S>vVjq?~l(  
 cMask=mask; `% #zMS  
 cKey=key; "`8H:y  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); CIxVR  
 return bRegistered; tXb7~aO  
} `gBXeG2fn  
a3(7{,Ew  
  四、小结 "`V"2zZlj  
Occ8Hk/l.  
  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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