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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: vnt%XU,,Y  
  "3"V3w  
  一、实现方法 N1S{suic  
vq0Tk bzs  
  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: gA+qC7=p$  
&yTqZ*Yuk  
#pragma data_seg("shareddata") UA0Bzoky;  
HHOOK hHook =NULL; //钩子句柄 ]z;I _-  
UINT nHookCount =0; //挂接的程序数目 4qbBc1,7y  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 :&rt)/I  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 H8zK$!  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey <QAFL uey  
static int KeyCount =0; V-2(?auZd  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 nH'e?>x~e  
#pragma data_seg() Z1f8/?`W  
D~fl JR  
  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。 b-?gw64#  
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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: ) 0W{]2  
Apag{Z]^B  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR L>NL:68yN  
cKey,UCHAR cMask) sA/D]W.P  
{ "]x'PI 4J  
 BOOL bAdded=FALSE; Y%aCMP9j~9  
 for(int index=0;index<MAX_KEY;index++){ l^-];|Y  
  if(hCallWnd[index]==0){ YQ)kRhFA  
   hCallWnd[index]=hWnd; c(m<h+ 2VL  
   HotKey[index]=cKey; 4JXeV&5Qk'  
   HotKeyMask[index]=cMask; 7~% ?#  
   bAdded=TRUE; 3`|@H-c9  
   KeyCount++; G1tY)_-8[  
   break; rjAn@!|:+  
  } r:'.nhe  
 } o5O#vW2Il&  
 return bAdded; c?*=|}N  
} ww3-^v  
//删除热键 z`}qkbvi  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;_I8^?d  
{ S-b/S5  
 BOOL bRemoved=FALSE; EIAc@$4  
 for(int index=0;index<MAX_KEY;index++){ M,,bf[p$  
  if(hCallWnd[index]==hWnd){ SrJGTuXg  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ beGa#JH,  
    hCallWnd[index]=NULL; o#gWbAG;]b  
    HotKey[index]=0; |\t-g" ~sN  
    HotKeyMask[index]=0; 7~ p@0)''  
    bRemoved=TRUE; b<ZIWfs  
    KeyCount--; 9(7-{,c  
    break; uEP*iPLD@  
   } aEWWP]  
  } ^j7Vt2-  
 } t+ G#{n  
 return bRemoved; A#<?4&  
} (Q!}9K3  
.},'~NM]  
7#a-u<HF"  
  DLL中的钩子函数如下: .bg~>T+<  
\fd v]f  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `r':by0M  
{ D|p9qe5%  
 BOOL bProcessed=FALSE; 9};8?mucr  
 if(HC_ACTION==nCode) yu|8_<bq  
 { FUb\e-Q=  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Y%^w:|f^  
   switch(wParam) !zpRrx_  
   {  k FD; i  
    case VK_MENU: MYvY]Jx3  
     MaskBits&=~ALTBIT; 'ya{9EdlT  
     break; yYYSeH  
    case VK_CONTROL: B{#I:Rs9  
     MaskBits&=~CTRLBIT; (gU!=F?#m  
     break; [5b--O  
    case VK_SHIFT: a0E)2vt4  
     MaskBits&=~SHIFTBIT; j0aXyLNX  
     break; y9GoPC`z  
    default: //judge the key and send message hEH?[>9  
     break; rfg'G&A(  
   } #L;dI@7C  
   for(int index=0;index<MAX_KEY;index++){ 69NeQ$](  
    if(hCallWnd[index]==NULL) 5 PJhEB  
     continue; }C?'BRX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4f@rv^f(X  
    { >Q;l(fdj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); n'LrQU  
     bProcessed=TRUE; Uz8ff  
    } 783,s_  
   } >T-u~i$s  
  } JR21>;l#2  
  else if((lParam&0xc000ffff)==1){ //有键按下 HM1Fz\Sf  
   switch(wParam) aFm_;\  
   { :\c ^*K(9  
    case VK_MENU: m? }6)\ob  
     MaskBits|=ALTBIT; p27~>xQ  
     break; P|E| $)m  
    case VK_CONTROL: "Gzz4D  
     MaskBits|=CTRLBIT; lgy <?LI\  
     break; @Uvz8*b6  
    case VK_SHIFT: s^9Voi.y  
     MaskBits|=SHIFTBIT; Y\P8 v  
     break; ,R\ \%  
    default: //judge the key and send message |aS.a&vwR  
     break; @*XV`_!h  
   }  4e7-0}0  
   for(int index=0;index<MAX_KEY;index++){ MJO-q $)c  
    if(hCallWnd[index]==NULL) ksUcx4;a@F  
     continue; -d/ =5yxL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d&Zpkbh"  
    { yx[/|nZDC4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); '<)n8{3Q5w  
     bProcessed=TRUE; eC4[AX6e  
    } 8kIksy  
   } U< fGGCw  
  } r Z$O?K  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Of#u  
   for(int index=0;index<MAX_KEY;index++){ ~,Ix0h+H+M  
    if(hCallWnd[index]==NULL) 4F:\-O  
     continue; K@]4g49A/j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) eM6<%?b  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Dml;#'IF3  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 v;{#Q&(  
   } _;y9$"A  
  } Gb6'n$g  
 } d7 y[0<xM  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); u&vf+6=9Dd  
} Hvi49c]]  
+\]\[6  
  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: jB2[(  
<'Eme  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); g:@#@1rB6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); oZgjQM$YP  
h(dvZ= %  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: %wy.TN  
.~;\eW[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?l{nk5,?-Y  
{ 5C ]x!>kX  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ,&.!?0+  
 { !;A\.~-!G  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 .p[ux vp  
  SaveBmp(); "&u@d~`-n  
  return FALSE; H*R"ntI?w  
 } ^^$s%{ep"  
 …… //其它处理及默认处理 IEi^kJflU  
} U7F!Z( 9  
B9z?mt'|r)  
JH9J5%sp  
  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。 S%>]q s  
0s[Hkhls  
  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。 + &Eqk  
iYoMO["X  
  二、编程步骤 7JH6A'&  
wwZ,;\  
  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"; C,r;VyW6BI  
<%eG:n,#  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; U8?mc  
d7upz]K9g  
  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; [z{1*Xc  
g! |kp?  
  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; 9Y9GwL]T  
:5<UkN)R(  
  5、 添加代码,编译运行程序。 #;yZ  
=; Ff4aF  
三、程序代码 N4!O.POP  
Ti5-6%~&  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL r,p%U!S<hV  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ZY+qA  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 6cXyJW  
#if _MSC_VER > 1000 oMa6(3T?E  
#pragma once I\ob7X'Xu!  
#endif // _MSC_VER > 1000 m:2^= l4  
#ifndef __AFXWIN_H__ 73;GW4,  
#error include 'stdafx.h' before including this file for PCH CD~.z7,LC  
#endif 7?_CcRe  
#include "resource.h" // main symbols L="}E rmK  
class CHookApp : public CWinApp W|mo5qrLS2  
{ m-, x<bM?  
 public: PJH&  
  CHookApp(); rV#ch(  
  // Overrides /U9"wvg  
  // ClassWizard generated virtual function overrides f]CXu3w(J  
  //{{AFX_VIRTUAL(CHookApp) VTE .^EK!  
 public: wmLs/:~  
  virtual BOOL InitInstance(); YS0<qSN  
  virtual int ExitInstance(); ^ Ze=uP  
  //}}AFX_VIRTUAL 4tBYR9|  
  //{{AFX_MSG(CHookApp) Q;rX;p^W  
  // NOTE - the ClassWizard will add and remove member functions here. "chDg(jMZ  
  // DO NOT EDIT what you see in these blocks of generated code ! kuP(r  
  //}}AFX_MSG sXPe/fWo  
  DECLARE_MESSAGE_MAP() )SGq[B6@I  
}; x%B/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); rx|pOz,:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4V`G,W4^J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); j\M?~=*w  
BOOL InitHotkey(); L!xi  
BOOL UnInit(); Gd85kY@w7  
#endif i XjM.G  
?Ir:g=RP*  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ;4\;mmLVk  
#include "stdafx.h" tR$NRMZ.  
#include "hook.h" i/Zd8+.n$  
#include <windowsx.h> -iZ`Y?  
#ifdef _DEBUG 3Y$GsN4ln  
#define new DEBUG_NEW #H~64/  
#undef THIS_FILE ~t~|"u"P  
static char THIS_FILE[] = __FILE__; 0g8NHkM:2a  
#endif K-Ef%a2#`  
#define MAX_KEY 100 ]Y&VT7+Z  
#define CTRLBIT 0x04 ;$g?T~v7  
#define ALTBIT 0x02 X &H"51  
#define SHIFTBIT 0x01 5{,<j\#L  
#pragma data_seg("shareddata") W"{N Bi  
HHOOK hHook =NULL; ~D>p0+-c  
UINT nHookCount =0; !4+<<(B=E  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 1 'Dai`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT p!%pP}I  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey OjA,]Gv6  
static int KeyCount =0; |[8Th4*n  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 9\(| D#  
#pragma data_seg() YoFxW5by  
HINSTANCE hins; z F;K  
void VerifyWindow(); Q"#J6@  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) }jPSUdo  
//{{AFX_MSG_MAP(CHookApp) X:{!n({r=  
// NOTE - the ClassWizard will add and remove mapping macros here. @H8EWTZ  
// DO NOT EDIT what you see in these blocks of generated code! -KbYOb  
//}}AFX_MSG_MAP {' H(g[k  
END_MESSAGE_MAP() :ShT|n7  
f|g g  
CHookApp::CHookApp() aN3;`~{9  
{ HGg@ _9tW  
 // TODO: add construction code here, )4;`^]F  
 // Place all significant initialization in InitInstance BiBOr}ZQ  
} 9M c ae 31  
_yR^*}xJb  
CHookApp theApp; R4d=S4 i  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) rytyw77t(  
{ 1o>xEWt:0K  
 BOOL bProcessed=FALSE; veECfR;  
 if(HC_ACTION==nCode) 47/iF97  
 { tZo} ;|~'  
  if((lParam&0xc0000000)==0xc0000000){// Key up u ^RxD^=L  
   switch(wParam) LDa1X2N  
   { #g!.T g'  
    case VK_MENU: alb.g>LNPP  
     MaskBits&=~ALTBIT; _q^E,P  
     break; `Q,H|hp;k;  
    case VK_CONTROL: <~=Vg  
     MaskBits&=~CTRLBIT; a8Wwq?@  
     break; xgtR6E^k  
    case VK_SHIFT: yB6?`3A:  
     MaskBits&=~SHIFTBIT; -UT}/:a  
     break; O#r%>;3*  
    default: //judge the key and send message ;dhQN }7  
     break; sDV Q#}a  
   } V(*(F7+  
   for(int index=0;index<MAX_KEY;index++){ =2x^nW  
    if(hCallWnd[index]==NULL) 7 X4LJf  
     continue; 2:ylv<\$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \73ch  
    { 32 =z)]FZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  9gZ$   
     bProcessed=TRUE; P!k{u^$L  
    } |ENh)M8}r  
   } Xn ;AZu^'R  
  } NGWxN8P6  
  else if((lParam&0xc000ffff)==1){ //Key down / XIhj  
   switch(wParam) +ck}l2&#  
   { i}?>g-(  
    case VK_MENU: QmIBaMI#  
     MaskBits|=ALTBIT; Z?z.?a r  
     break; ? =+WRjF  
    case VK_CONTROL: 9nbLg5P  
     MaskBits|=CTRLBIT; TS5Q1+hWHV  
     break; 3R V R  
    case VK_SHIFT: cM7[_*Ot<m  
     MaskBits|=SHIFTBIT; rrv%~giU  
     break; [0 e_*  
    default: //judge the key and send message [ikOb8 G#  
     break; xId.GWY1  
   } Xha..r  
   for(int index=0;index<MAX_KEY;index++) A5w6]:f2  
   { 40 0#v|b  
    if(hCallWnd[index]==NULL) cN9t{.m  
     continue; J$v?T$LVw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1-QS~)+  
    { .%QXzIa3F  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); CJI~_3+K  
     bProcessed=TRUE; ;A!BVq  
    } ,7b[!#?8  
   } Q NVa?'0"Y  
  } F4{IEZ  
  if(!bProcessed){ >&k-'`Nw  
   for(int index=0;index<MAX_KEY;index++){ {]|J5Dgfe  
    if(hCallWnd[index]==NULL) 0SPk|kr  
     continue; dcT80sOC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) */DO ex"y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {1 94!S4z  
   } 0qT%!ku&  
  } Wo ,?+I  
 } 29q _BR *:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~F7gP{r  
} iG?[<1~  
dC4'{ n|7  
BOOL InitHotkey() 4xJQ!>6  
{ {FTqu.  
 if(hHook!=NULL){ @xZR9Z8]L  
  nHookCount++; RCLeA=/N@0  
  return TRUE; 4v|W-h"K  
 } u> / TE  
 else 61 ~upQaR  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); t&Og$@  
  if(hHook!=NULL) BL58] P84  
   nHookCount++; RzusNS  
  return (hHook!=NULL); $u6 3]rypm  
} H 7 ^/q7  
BOOL UnInit() ~< x:q6  
{ o%*xvH*A  
 if(nHookCount>1){ 6\S~P/PkE  
  nHookCount--; Pr,q*_Yy  
  return TRUE; *HB-QIl  
 } #LN`X8Wz'  
 BOOL unhooked = UnhookWindowsHookEx(hHook); *4_Bd=5(U  
 if(unhooked==TRUE){ s(roJbJ_;  
  nHookCount=0; S`?!G&[!>  
  hHook=NULL; dGTsc/$  
 } 8e"gW >f  
 return unhooked; O<W_fx8_'  
} -s'-eQF J  
?P c'C  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) pFz`}?c0  
{ 8sK9G` k  
 BOOL bAdded=FALSE; e<q?e}>?  
 for(int index=0;index<MAX_KEY;index++){ eKqk= (  
  if(hCallWnd[index]==0){ ymcLFRu,  
   hCallWnd[index]=hWnd; i(+p0:< 0  
   HotKey[index]=cKey; y L~W.H  
   HotKeyMask[index]=cMask; w:l V"]1  
   bAdded=TRUE; ?@ $r  
   KeyCount++; e64^ChCoV  
   break; Lq!>kT<]!  
  } vgN&K@hJ  
 } 0'o:#-  
 return bAdded; w"&n?L  
}  1ZB"EQ  
FN) $0  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) b*Q&CL  
{ !_Z&a  
 BOOL bRemoved=FALSE; R_S.tT!  
 for(int index=0;index<MAX_KEY;index++){ ?#Q #u|~  
  if(hCallWnd[index]==hWnd){ lCHO;7YHX  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2T[9f;jM'  
    hCallWnd[index]=NULL; ;mKb]  
    HotKey[index]=0; 26x[X.C:  
    HotKeyMask[index]=0; 1 I",L&S1  
    bRemoved=TRUE; {P#|zp4C{  
    KeyCount--; U\!X,a*ts{  
    break; CQDkFQq-dq  
   } 1hNq8*|  
  } *bpD`s @  
 } 6/dI6C!  
 return bRemoved; Tkgs]q79  
} IRqy%@)  
42ivT_H  
void VerifyWindow() iM 3V=&)  
{ i8HTzv"J  
 for(int i=0;i<MAX_KEY;i++){ 8Kk(8a&v  
  if(hCallWnd!=NULL){ DrK{}uM  
   if(!IsWindow(hCallWnd)){ 8BNi1Qn$  
    hCallWnd=NULL; I ?.^ho  
    HotKey=0; LvYB7<zk>  
    HotKeyMask=0; b9dLt6d  
    KeyCount--; 0%I=d  
   } I4?5K@a  
  } D*|Bb?  
 } 4x[S\,20  
} 07=mj%yV  
t}/( b/VD  
BOOL CHookApp::InitInstance() 2P{Gxz<#  
{ [Cv/{f3]u{  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); YQA ,f#  
 hins=AfxGetInstanceHandle(); cD'V>[h  
 InitHotkey(); g_COp "!~9  
 return CWinApp::InitInstance(); Q6I:"2u1  
} n#_$\ p>Yd  
nwCrZW  
int CHookApp::ExitInstance() HT1!5  
{ "AGLVp.zT  
 VerifyWindow(); W X6&oy>  
 UnInit(); L5:$U>H(  
 return CWinApp::ExitInstance();  U}j0D2  
} 'F#KM1s  
$5Ff1{  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ))'<_nD  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ~zNAbaC+>t  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ XAL1|] S  
#if _MSC_VER > 1000 iTU5l5Uz  
#pragma once fkNbS  
#endif // _MSC_VER > 1000 e'D&8z_;  
I"7u2"@-8j  
class CCaptureDlg : public CDialog O/(xj2~$ J  
{ fNZ__gO!%  
 // Construction t |A-9^t'!  
 public: (0y~%J  
  BOOL bTray; WlBc.kFck  
  BOOL bRegistered; R`^_(yn>  
  BOOL RegisterHotkey(); hSyql  
  UCHAR cKey; #],&>n7'  
  UCHAR cMask; F6 flIG&h  
  void DeleteIcon(); i5,kd~%O  
  void AddIcon(); y>e.~5;  
  UINT nCount; _[ZO p ~  
  void SaveBmp(); < F+l  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor C/6V9;U  
  // Dialog Data :'*~uJrR  
  //{{AFX_DATA(CCaptureDlg) 3y8G?LL/[7  
  enum { IDD = IDD_CAPTURE_DIALOG }; 9\JF`ff_  
  CComboBox m_Key; q;>7*Y&  
  BOOL m_bControl; (+y  
  BOOL m_bAlt; .z}~4BY  
  BOOL m_bShift; K~eh P[^  
  CString m_Path; P;]F(in=  
  CString m_Number; `(/w y  
  //}}AFX_DATA s>n)B^64W  
  // ClassWizard generated virtual function overrides Ng>h"H  
  //{{AFX_VIRTUAL(CCaptureDlg) dQR-H7U  
 public: Qhcu>r a  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ?]Xpi3k  
 protected: |R\>@Mg#B  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support bY QRBi  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); A#'8X w|  
  //}}AFX_VIRTUAL G<rHkt@[  
  // Implementation !9P';p}2  
 protected: 2JcjZn  
  HICON m_hIcon; *w0%d1  
  // Generated message map functions Jcm&RI"{  
  //{{AFX_MSG(CCaptureDlg) JQHvz9Yg  
  virtual BOOL OnInitDialog(); tc{s B\&-  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); eb"5- 0  
  afx_msg void OnPaint(); ZlzjVU/E  
  afx_msg HCURSOR OnQueryDragIcon(); ptxbDzOz  
  virtual void OnCancel(); JKGe"  
  afx_msg void OnAbout(); UVIKQpA]A  
  afx_msg void OnBrowse(); uT7B#b7  
  afx_msg void OnChange(); gz#i.-  
 //}}AFX_MSG KE3;V2Ym f  
 DECLARE_MESSAGE_MAP() eHNyNVz  
}; \%N!5>cZ{  
#endif ):_\;.L  
_1!OlQ  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file HLaRGN3,  
#include "stdafx.h" (7=!+'T"  
#include "Capture.h" RxWVe-Dg  
#include "CaptureDlg.h" K':;%~I  
#include <windowsx.h> !fR3 (=oN  
#pragma comment(lib,"hook.lib") +8d1|cB"  
#ifdef _DEBUG vbe|hO""  
#define new DEBUG_NEW 6?~"V  
#undef THIS_FILE lHe{\N[C  
static char THIS_FILE[] = __FILE__; mah JSz(3  
#endif xx9 g''Q  
#define IDM_SHELL WM_USER+1 s6.M\^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @Y<bwv  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;{tj2m,  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; x%!s:LVX  
class CAboutDlg : public CDialog f-G :uI_  
{ h2J/c#Qvh  
 public: 8~z~_TD6m@  
  CAboutDlg(); 6){]1h"  
  // Dialog Data dD|OSB7 I7  
  //{{AFX_DATA(CAboutDlg) ^pF&` 2eD  
  enum { IDD = IDD_ABOUTBOX }; QD*35Y!d  
  //}}AFX_DATA [dIXR  
  // ClassWizard generated virtual function overrides !1 8clL  
  //{{AFX_VIRTUAL(CAboutDlg) ll.N^y;a  
 protected: Jx7C'~,J  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support H0`]V6+<f  
  //}}AFX_VIRTUAL -0{r>,&Mm  
  // Implementation 8sTp`}54 J  
 protected: 9V@V6TvW>&  
  //{{AFX_MSG(CAboutDlg) G5aieD.#  
  //}}AFX_MSG Ne{?:h.!  
  DECLARE_MESSAGE_MAP() '2nhv,|.U  
}; 27O|).yKX  
@ H7d_S  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) F{~{Lthc  
{ ,UGRrS  
 //{{AFX_DATA_INIT(CAboutDlg) cacr=iX  
 //}}AFX_DATA_INIT %'7lbpy,f  
} WRy aKM  
yiC^aY=-  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ?6un4EVL{  
{ UK O[r;  
 CDialog::DoDataExchange(pDX); ^!ZC?h!rG  
 //{{AFX_DATA_MAP(CAboutDlg) YS@ypzc/  
 //}}AFX_DATA_MAP >TnTnFWX  
} Be=u&T:~  
X"e5 Y!:M-  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) dP<=BcH>f  
 //{{AFX_MSG_MAP(CAboutDlg) EGzzHIZ`!  
 // No message handlers ( b~T]3Es  
 //}}AFX_MSG_MAP [] `&vWZ  
END_MESSAGE_MAP() _'>oXQJ  
``Dq  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) s!&#c`=  
: CDialog(CCaptureDlg::IDD, pParent) 9c#+qH  
{ pU%n]]qF  
 //{{AFX_DATA_INIT(CCaptureDlg) #W'HR  
  m_bControl = FALSE; > BY&,4r  
  m_bAlt = FALSE; wq(7|!Eix  
  m_bShift = FALSE; (@<c6WS  
  m_Path = _T("c:\\"); ]?+p5;{y4  
  m_Number = _T("0 picture captured."); !K}~/9Z=m  
  nCount=0; (ehK?6[  
  bRegistered=FALSE; `W:%mJd9  
  bTray=FALSE; ?:8ido#-  
 //}}AFX_DATA_INIT +*T7@1  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Dhw(#{N  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); UU mTOJr  
} ,PuL{%PXu  
r1.nTO%  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) zHL@i0>^  
{ ICs\ z  
 CDialog::DoDataExchange(pDX); q[`]D7W "  
 //{{AFX_DATA_MAP(CCaptureDlg) 6[LM_eP  
  DDX_Control(pDX, IDC_KEY, m_Key); vCxD~+zf  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 1[qLA!+  
  DDX_Check(pDX, IDC_ALT, m_bAlt); QnXA*6DJ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); x:>wUhzZ  
  DDX_Text(pDX, IDC_PATH, m_Path); E^lvbLh'  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Wm"4Ae:B  
 //}}AFX_DATA_MAP Z X(z;|l45  
} gp^ 5#  
d + /&?3  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) wNtx]t_M  
//{{AFX_MSG_MAP(CCaptureDlg) 9S7 kUl{  
 ON_WM_SYSCOMMAND() 5rRN-  
 ON_WM_PAINT() Xg SxN!I  
 ON_WM_QUERYDRAGICON() ?hM>mL  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 28H8l2{[>  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) (?`kYTw7g'  
 ON_BN_CLICKED(ID_CHANGE, OnChange) \h DdU+  
//}}AFX_MSG_MAP *4xat:@{{  
END_MESSAGE_MAP() SHbtWq}T  
~\.w^*$#Y  
BOOL CCaptureDlg::OnInitDialog() P8>d6;o($  
{ Nz+9 49X  
 CDialog::OnInitDialog(); rI>aAW'  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8lb%eb]U  
 ASSERT(IDM_ABOUTBOX < 0xF000); SAK!z!t  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ang~<  
 if (pSysMenu != NULL) Xr2ou5zAn  
 { . DR<Te  
  CString strAboutMenu; %K` % *D  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Y/ee~^YxK'  
  if (!strAboutMenu.IsEmpty()) " '6;/N  
  { qg!|l7e  
   pSysMenu->AppendMenu(MF_SEPARATOR); ~j5x+yC  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #iWSDy  
  } 'fF;(?  
 } a /#PLP  
 SetIcon(m_hIcon, TRUE); // Set big icon S<u-n8bv  
 SetIcon(m_hIcon, FALSE); // Set small icon =p?WBZT|:  
 m_Key.SetCurSel(0); 4EZ9hA9+  
 RegisterHotkey(); n9A7K$ZD@  
 CMenu* pMenu=GetSystemMenu(FALSE); Y"Ql!5=  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,(?po (']  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); #hf ak  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \2}bi:e 6  
 return TRUE; // return TRUE unless you set the focus to a control te !S09(  
} <]4i`6{v  
:GW&O /Yo  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 1_ C]*p  
{ %1O[i4s:-  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) H5]^ 6 HwX  
 { 2eC(Ijq[a  
  CAboutDlg dlgAbout; + 33@?fl.  
  dlgAbout.DoModal(); %Gj8F4{  
 } '|*?*6q  
 else Yd=a}T  
 { 9^Whg ~{  
  CDialog::OnSysCommand(nID, lParam); >teO m?@U  
 } \ZhfgE8{%  
} ~r$jza~o(  
]Xf% ,iu  
void CCaptureDlg::OnPaint() @` Eg(  
{ XC "'Q+  
 if (IsIconic()) .YnFH$;$  
 { _~tEw.fM5  
  CPaintDC dc(this); // device context for painting 0=q;@OIf  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); * U$!I?  
  // Center icon in client rectangle 2aB^WY'tC  
  int cxIcon = GetSystemMetrics(SM_CXICON); B`o]*"xkB  
  int cyIcon = GetSystemMetrics(SM_CYICON); 0i|oYaC  
  CRect rect; rBTeb0i?  
  GetClientRect(&rect); Ns0cgCrhX  
  int x = (rect.Width() - cxIcon + 1) / 2; FwY&/\J7V  
  int y = (rect.Height() - cyIcon + 1) / 2; f<*Js)k  
  // Draw the icon f7~9|w&  
  dc.DrawIcon(x, y, m_hIcon); s^|.Zr;,>  
 } ^Q ps> A(  
 else nF4a-H&Fo  
 { .OqSch|  
  CDialog::OnPaint(); Qb; d:@9  
 } M=*bh5t%]  
} VY"9?2?/  
Ra/Ukv_v  
HCURSOR CCaptureDlg::OnQueryDragIcon() RJH,  
{ .8uz 6~  
 return (HCURSOR) m_hIcon; bY2 C]r(n  
} xD /9F18  
?N=m<fn  
void CCaptureDlg::OnCancel() Cb@3M"1:  
{ 1q3( @D5~+  
 if(bTray) LIVU^Os.  
  DeleteIcon(); -0eq_+oQ  
  CDialog::OnCancel(); uy^   
} V&|Ed  
?EpSC&S\  
void CCaptureDlg::OnAbout() E)-r+ <l  
{ }KKY6D|d>  
 CAboutDlg dlg; X3:XTuV   
 dlg.DoModal(); A'K%WW*'U  
} )VK }m9Ae  
Za7q$7F7Bc  
void CCaptureDlg::OnBrowse() NU\ 5{N<  
{ #9 fWAF  
 CString str; |R@~-Ht  
 BROWSEINFO bi; ~h=X8-D  
 char name[MAX_PATH]; ',4x$qe  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); d:q +  
 bi.hwndOwner=GetSafeHwnd(); 5P+t^\  
 bi.pszDisplayName=name; :@xm-.D  
 bi.lpszTitle="Select folder"; -;XKcS7Ue  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Hiv!BV|  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); s(LT  
 if(idl==NULL) ~i_Tw#}  
  return; (j"(  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Q2];RS3.  
 str.ReleaseBuffer(); qcJft'>F  
 m_Path=str; FvuGup`w  
 if(str.GetAt(str.GetLength()-1)!='\\') bo=ZM9  
  m_Path+="\\"; !.<T"8BUpv  
 UpdateData(FALSE); H,<7G;FPT  
} g3sUl&K  
%F9{EXJy  
void CCaptureDlg::SaveBmp() o}'bv  
{ \cJ-Dd  
 CDC dc; $]&(7@'qo  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); NLe}Jqp  
 CBitmap bm; %=<IGce  
 int Width=GetSystemMetrics(SM_CXSCREEN); >x@P|\  
 int Height=GetSystemMetrics(SM_CYSCREEN); c<BO gNr  
 bm.CreateCompatibleBitmap(&dc,Width,Height); CG&`16KN7  
 CDC tdc; Koln9'tB  
 tdc.CreateCompatibleDC(&dc); LFp]7Dq  
 CBitmap*pOld=tdc.SelectObject(&bm); .LRxP#B  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 3PUAH  
 tdc.SelectObject(pOld); E%TpJl'U  
 BITMAP btm; 9>#:/g/  
 bm.GetBitmap(&btm); rf9_eP  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; pA#}-S%  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); (|fm6$  
 BITMAPINFOHEADER bih; O0*e)i8  
 bih.biBitCount=btm.bmBitsPixel; YEx)"t8E  
 bih.biClrImportant=0; "$5\,  
 bih.biClrUsed=0; wVA|!>v  
 bih.biCompression=0; XfzVcap  
 bih.biHeight=btm.bmHeight; PaCzr5!~f  
 bih.biPlanes=1; jSQ9.%4  
 bih.biSize=sizeof(BITMAPINFOHEADER); 5NXt$k5  
 bih.biSizeImage=size; qG9+/u)\  
 bih.biWidth=btm.bmWidth; F{\gc|!i  
 bih.biXPelsPerMeter=0; 0ZPV' `KGp  
 bih.biYPelsPerMeter=0; kF V7l  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); t.hm9}UQ  
 static int filecount=0; Vjm_F!S  
 CString name; M}"r#Plq  
 name.Format("pict%04d.bmp",filecount++); A?"h@-~2  
 name=m_Path+name; Q1&P@Io$  
 BITMAPFILEHEADER bfh; '!Kf#@';u  
 bfh.bfReserved1=bfh.bfReserved2=0; x q-$\#O  
 bfh.bfType=((WORD)('M'<< 8)|'B'); =]Hs|{  
 bfh.bfSize=54+size; $\Tkhq<  
 bfh.bfOffBits=54; @gBE{)Fj  
 CFile bf; q1hMmMi  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Q7o5R{.oJ  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); N 6O8Wn  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); dd7 =)XT+  
  bf.WriteHuge(lpData,size); 2#/p|$;Ec'  
  bf.Close(); 2$zU&p7sV  
  nCount++; Q\J,}1<`6  
 } Y &r]lD  
 GlobalFreePtr(lpData); Zq ot{s  
 if(nCount==1) N\1/JW+  
  m_Number.Format("%d picture captured.",nCount); I]J*BD#n.  
 else /=#~  
  m_Number.Format("%d pictures captured.",nCount); !m{2WW-  
  UpdateData(FALSE); 9-bG<`v\E  
} bYh9sO/l  
zyN (4  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) EZ(^~k=I  
{ }Ewo_P&`  
 if(pMsg -> message == WM_KEYDOWN) SLk2X;c]o  
 { )3z]f2  
  if(pMsg -> wParam == VK_ESCAPE) dyFKxn`,  
   return TRUE; qG >DTKIU  
  if(pMsg -> wParam == VK_RETURN) f!-Sz/c#  
   return TRUE; Gwd{#7FM`  
 } HrqF![_  
 return CDialog::PreTranslateMessage(pMsg); XqR{.jF.  
} T"E(  F  
02]xJo  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) JFqf;3R  
{ "gNK><  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ s"0b%0?A  
  SaveBmp(); o;-<|W>  
  return FALSE; }Pg' vJW  
} 0v"&G<J  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ O rk  
 CMenu pop; bEr.nF  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); {.#zHL ;  
 CMenu*pMenu=pop.GetSubMenu(0); ZZ A.a  
 pMenu->SetDefaultItem(ID_EXITICON); VVrwOo CN  
 CPoint pt; udTxNl!  
 GetCursorPos(&pt); 6|;0ax4:P  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); `f'C[a"  
 if(id==ID_EXITICON) fEu9Jk  
  DeleteIcon(); o|2 87S|$  
 else if(id==ID_EXIT) C?Qf F{!7  
  OnCancel(); t,vTAq.))  
 return FALSE; $M]%vG  
} A"/aGCG0z  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); >7>7/7=O  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) +|nsu4t,<  
 AddIcon(); +X!+'>  
 return res; .9\Cy4_qSd  
} Jc~E"x  
J7a-CI_Tf  
void CCaptureDlg::AddIcon() ~! Lw1]&  
{ .w FU:y4r  
 NOTIFYICONDATA data; z(d4)z 8'6  
 data.cbSize=sizeof(NOTIFYICONDATA); lfMH1llx  
 CString tip; .g-3e"@  
 tip.LoadString(IDS_ICONTIP); {u]CHN`%Z  
 data.hIcon=GetIcon(0); TSyzdnMvz  
 data.hWnd=GetSafeHwnd(); o#d$[oa  
 strcpy(data.szTip,tip); 8)Tj H'  
 data.uCallbackMessage=IDM_SHELL; WX*cICb5  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; mvf _@2^  
 data.uID=98; hrlCKL&  
 Shell_NotifyIcon(NIM_ADD,&data); O~Uw&Bq  
 ShowWindow(SW_HIDE); VA]ZR+m  
 bTray=TRUE; @bQ!zCI  
} k`IrZHMw  
9c5!\m1  
void CCaptureDlg::DeleteIcon() oBUh]sR{.  
{ &8Wlps`  
 NOTIFYICONDATA data; ]b\WaS8I  
 data.cbSize=sizeof(NOTIFYICONDATA);  g@(30{  
 data.hWnd=GetSafeHwnd(); CB@B.)E  
 data.uID=98; |,fh)vO  
 Shell_NotifyIcon(NIM_DELETE,&data); x[m'FsR4  
 ShowWindow(SW_SHOW); T^.{9F]*S  
 SetForegroundWindow(); $wXih#7  
 ShowWindow(SW_SHOWNORMAL); fle0c^=  
 bTray=FALSE; \2eFpy(  
} WRMz]|+}4  
WB"$u2{|i  
void CCaptureDlg::OnChange() j];1"50?  
{ |\p5mh  
 RegisterHotkey(); anitqy#E  
} :+pPr Gj"  
:A$wX$H01  
BOOL CCaptureDlg::RegisterHotkey() ArdJ."  
{ 8c?8X=|D7  
 UpdateData(); wR1K8b".DC  
 UCHAR mask=0; wG6FS  
 UCHAR key=0; "w1(g=n  
 if(m_bControl) XkoWL  
  mask|=4; ,yi2O]5e>!  
 if(m_bAlt) o(SuUGW  
  mask|=2; 6Wu*.53  
 if(m_bShift) InX{V|CW?  
  mask|=1; :,=Fx</H  
  key=Key_Table[m_Key.GetCurSel()]; '!j(u@&!  
 if(bRegistered){ >?Qxpqf2  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); :dbV2'vIQ  
  bRegistered=FALSE; B(E tXB9  
 } v7$9QVze  
 cMask=mask; R]fYe#!"  
 cKey=key; Dpp@*xX>  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); @>9A$w$H|a  
 return bRegistered; f8F1~q  
} "x.88,T6  
?ZM^%]/+  
  四、小结 Kk56/(_S  
cl#OvQ  
  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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