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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: !+.|T9P  
  ? kew[oZ  
  一、实现方法 <GShm~XD2  
j8@YoD5o  
  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: L;xc,"\3  
yg "u^*r&  
#pragma data_seg("shareddata") B:tST(  
HHOOK hHook =NULL; //钩子句柄 I C9:&C[  
UINT nHookCount =0; //挂接的程序数目 B7TA:K  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 2C %{A  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 f{lg{gA(  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey RC8{QgaI  
static int KeyCount =0; 2|o6~m<pE  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Um\Nd#=:  
#pragma data_seg() GljxYH"]#  
kF~}htv.=  
  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。 0z."6 r  
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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: )vsiX}3  
K,' ]G&K  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Zb7KHKO{  
cKey,UCHAR cMask) (^eSm]<  
{ IR>^U  
 BOOL bAdded=FALSE; .F.4fk  
 for(int index=0;index<MAX_KEY;index++){ l_u1 ~K  
  if(hCallWnd[index]==0){ |nXs'TO'O  
   hCallWnd[index]=hWnd; :gb7Py'C  
   HotKey[index]=cKey; @5zL4n@w  
   HotKeyMask[index]=cMask; Qg?^%O'  
   bAdded=TRUE; W)V"QrFK  
   KeyCount++; <!&nyuSz  
   break; _p7c<$ ;  
  } Og%qv Bj 6  
 } J']1^"_'  
 return bAdded; &oYX093di  
} Gw3|"14  
//删除热键 Te2XQU2,F  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Hw<t>z k  
{ br<,?  
 BOOL bRemoved=FALSE; ,a< !d  
 for(int index=0;index<MAX_KEY;index++){ TH)gW  
  if(hCallWnd[index]==hWnd){ G F,/<R#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ G[6V=G  
    hCallWnd[index]=NULL; ?`,UW;Br6  
    HotKey[index]=0; iO3@2J  
    HotKeyMask[index]=0; Tm[IOuhM'?  
    bRemoved=TRUE; cy?u *  
    KeyCount--; Revc :m1o  
    break; M'HmVg4'  
   } hp,bfcM  
  } Eti;(>"@  
 } G(|ki9^@"9  
 return bRemoved; {DBgW},  
} . 5|wy<  
E@R7b(:*  
 HlPf   
  DLL中的钩子函数如下: N(]6pG=  
LwkZ(Tt  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <;+&`R  
{ N4}/n  
 BOOL bProcessed=FALSE; Z|uUE   
 if(HC_ACTION==nCode) \8=>l?P  
 { !u~( \ Rb;  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Yc/rjEn7O  
   switch(wParam) #G|iEC0C  
   {  <y\>[7Y  
    case VK_MENU: L$l'wz  
     MaskBits&=~ALTBIT; *xM4nUu<~  
     break; yu<sd}@  
    case VK_CONTROL: %ztCcgu*  
     MaskBits&=~CTRLBIT; JpD<2Mz_|V  
     break; lz faW-nu  
    case VK_SHIFT: OYgD9T.8^  
     MaskBits&=~SHIFTBIT; 3F[z]B  
     break; 1N1MD@C?P  
    default: //judge the key and send message 4{X5ZS?CkI  
     break; 5)2lZ(5.A#  
   } %[-D&flKC  
   for(int index=0;index<MAX_KEY;index++){ Sh*LD QL<?  
    if(hCallWnd[index]==NULL) /{d7%Et6  
     continue; fZ]Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V3xC"maA@  
    { 5pI2G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); i(2s"Uww,  
     bProcessed=TRUE; tqAh &TW3+  
    } X&TTw/J!^  
   } UOZ"#cQ  
  } g,7`emOX  
  else if((lParam&0xc000ffff)==1){ //有键按下 ?^Q!=W<7  
   switch(wParam) |jk"; h  
   { bf-.SX~  
    case VK_MENU: &o= #P2Qd  
     MaskBits|=ALTBIT; 5<GC  
     break; - ~T LI&[  
    case VK_CONTROL: 7d]}BLpjWz  
     MaskBits|=CTRLBIT; :xm, Ok  
     break; g a? .7F  
    case VK_SHIFT: >jME == U0  
     MaskBits|=SHIFTBIT; ux& WN ,  
     break; vp 1IYW  
    default: //judge the key and send message s6lo11  
     break; >pbO\=j]X  
   } LS+ _y <v=  
   for(int index=0;index<MAX_KEY;index++){ mMS%O]m,|  
    if(hCallWnd[index]==NULL) kTT!gZP$  
     continue; /G9wW+1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7;) T;X  
    { 4)!aYvaER  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); :,Q\!s!  
     bProcessed=TRUE; ly7\H3  
    } "H" 4(3  
   } ;x$,x-  
  } Jv %, v?  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 \ty{KAc&  
   for(int index=0;index<MAX_KEY;index++){ b<P9@h~:  
    if(hCallWnd[index]==NULL) Q.>@w<[!L  
     continue; <[@AMdS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #;)Oi9{9;  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (y[+s?;WyB  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 4`yCvPu  
   } 7](,/MeGG  
  } :$~)i?ge<5  
 }  SS[jk  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); zp:kdN7!^  
} ARGtWW~:  
C}<j8a?  
  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: 3vfm$sx@  
uPr'by  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2w>WS#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); PTWP7A[  
[fiB!G ]?  
  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: ;!q _+P  
}A\s`H m  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) vxhs1vh  
{ 7xTgG!>v  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) o|YY,G=C  
 { <^c?M[ j  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 y[:\kI  
  SaveBmp(); :hr% 6K7  
  return FALSE; dl mF?N|EC  
 } y{ %2Q)  
 …… //其它处理及默认处理 u9ObFm$7  
} 0}C> e`<'  
[nZf4KN  
 S<#>g s4  
  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。 {4J:t_<nKO  
zP$0B!9  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 IL;JdIa  
kU{+@MA;  
  二、编程步骤 @E;'Ffo  
Tw *:Vw  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; I(tMw6C$:  
OJ^kESrm8  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; K4~z@. G6*  
d7waBsf  
  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; &*}`uJt  
?~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; W/DSj :  
y.PWh<dI  
  5、 添加代码,编译运行程序。 }K':tX?  
Q#w mS&$f  
三、程序代码 &YC Z L  
*(wkgn  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL > Dy<@e  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ix4O-o{  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ <qJI]P  
#if _MSC_VER > 1000 FcVQ_6  
#pragma once P'%#B&LZo  
#endif // _MSC_VER > 1000 E[q:65xl  
#ifndef __AFXWIN_H__ E-gI'qG\(  
#error include 'stdafx.h' before including this file for PCH {w:*t)@j  
#endif U4)x"s[CP  
#include "resource.h" // main symbols :0@R(ct;>  
class CHookApp : public CWinApp Sk7l&B  
{ nb-]fa  
 public: %3b;`Oa  
  CHookApp(); #gn{X!;-;  
  // Overrides {9?++G"\  
  // ClassWizard generated virtual function overrides :5|'C  
  //{{AFX_VIRTUAL(CHookApp) R9XISsM^  
 public: eajctkzj  
  virtual BOOL InitInstance(); -' :;0  
  virtual int ExitInstance(); ykK21P,v  
  //}}AFX_VIRTUAL H4RqOI  
  //{{AFX_MSG(CHookApp) qLC_p)  
  // NOTE - the ClassWizard will add and remove member functions here. &! i'Q;q  
  // DO NOT EDIT what you see in these blocks of generated code ! [bM$n m  
  //}}AFX_MSG cxX/ b ,  
  DECLARE_MESSAGE_MAP() F{*{f =E!B  
}; "#}Uh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Q1f)uwh  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (bhMo^3/*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %G6Q+LMwm  
BOOL InitHotkey(); *rKj%Me  
BOOL UnInit(); <"/b 5kc  
#endif QguRU|y  
oKyl2jg+,  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. (h {"/sR  
#include "stdafx.h" CCoT  
#include "hook.h" HGycF|]2  
#include <windowsx.h> ?{=& Ro  
#ifdef _DEBUG rtM29~c>@  
#define new DEBUG_NEW m\*;Fx  
#undef THIS_FILE f2h`bO  
static char THIS_FILE[] = __FILE__; Ln-UN$2~F  
#endif M2Q*#U>6r  
#define MAX_KEY 100 L#huTKX}  
#define CTRLBIT 0x04 v7-z<'?s~  
#define ALTBIT 0x02 $-^ ;Jl  
#define SHIFTBIT 0x01 iA.:{^_)09  
#pragma data_seg("shareddata") YQ? "~[mL  
HHOOK hHook =NULL; B`{7-Asc1  
UINT nHookCount =0; uwI$t[  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey zX]4DLl,  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ! 2=m |,  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey r0^*|+   
static int KeyCount =0; >o/+z18x  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift A4K8DP  
#pragma data_seg() y@XE! L  
HINSTANCE hins; o?,c#g  
void VerifyWindow(); k2-+3zx  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) P~}Yj@2  
//{{AFX_MSG_MAP(CHookApp) ZuLW%z.  
// NOTE - the ClassWizard will add and remove mapping macros here. ol3].0Vc]  
// DO NOT EDIT what you see in these blocks of generated code! N1D{ %  
//}}AFX_MSG_MAP !)r1zSY"g  
END_MESSAGE_MAP() pNFVa<D  
DhVO}g)2#  
CHookApp::CHookApp() F ?N+ __o  
{ _a]0<Vm C0  
 // TODO: add construction code here, evSr?ys  
 // Place all significant initialization in InitInstance 6 uS;H]nd<  
} ,vDSY N6  
/Fj*sS8  
CHookApp theApp; 8*x/NaH /\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \Gl>$5np  
{ O[Yc-4  
 BOOL bProcessed=FALSE; F_I.=zQr  
 if(HC_ACTION==nCode) !8Y $}  
 { V$Zl]f$S  
  if((lParam&0xc0000000)==0xc0000000){// Key up Kcu*Z  
   switch(wParam) :DG7Z  
   { PenkqDc}  
    case VK_MENU: E !EENg  
     MaskBits&=~ALTBIT; 1[] 9EJ  
     break; }'`iJ b\  
    case VK_CONTROL: ^\ku}X_ [?  
     MaskBits&=~CTRLBIT; Q30TR  
     break; %\f<N1~*  
    case VK_SHIFT: `RlMfd  
     MaskBits&=~SHIFTBIT; @f!r"P]  
     break; ]mR!-Fqj  
    default: //judge the key and send message mI> =S  
     break; 'w"hG$".  
   } Xk>YiV",?  
   for(int index=0;index<MAX_KEY;index++){ BAIR!  
    if(hCallWnd[index]==NULL) )z\ 73|w  
     continue; 1j_ 6Sw(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w~AW( VX  
    { mufXM(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u>\u}c  
     bProcessed=TRUE; 'z9}I #  
    } dKpUw9C#/  
   } xLShMv}  
  } a{ p1Yy-]  
  else if((lParam&0xc000ffff)==1){ //Key down X..<U}e  
   switch(wParam) {>Yna"p  
   { DCP B9:u  
    case VK_MENU:  9dCf@5]  
     MaskBits|=ALTBIT; 'H8b+  
     break; >F5E^DY  
    case VK_CONTROL: AfT;IG%Gt  
     MaskBits|=CTRLBIT; ) :VF^"  
     break; Y52TC@'  
    case VK_SHIFT: 5~FXy{ZIH  
     MaskBits|=SHIFTBIT; ZH)thd9^b  
     break; Ba}<X;B}  
    default: //judge the key and send message gP2<L5&Z,  
     break; d3;Sy`.  
   } -|2k$W  
   for(int index=0;index<MAX_KEY;index++) s 9n_s=w  
   { F\2<q$Zn+  
    if(hCallWnd[index]==NULL) jZgCDA8Mr!  
     continue; h f{RI4Jc  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X?aj0# Q  
    { &HBC9Bx/(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9GgXX9K  
     bProcessed=TRUE; QB5,Vfoux  
    } @bIZ0tr4  
   } bLSUF`-z  
  } g[L}puN  
  if(!bProcessed){ P$v9  
   for(int index=0;index<MAX_KEY;index++){ y=&^=Z h[  
    if(hCallWnd[index]==NULL) LI9 Uc\  
     continue; @(CJT-Ak  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) c[+uwO~  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |>/m{L[  
   } :Aa5,{v _  
  } O`f[9^fN  
 } , lFhLj7  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); UO( ?EELm  
} SnVb D<  
~o27~R ]  
BOOL InitHotkey() VXO.S)v2J  
{ xM:9XhH1  
 if(hHook!=NULL){ O ]!/fZ;(  
  nHookCount++; :yFmCLZaQ  
  return TRUE; l.uW>AoLh  
 } m't8\fo^w  
 else rm%MQmF  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 534DAhpD=.  
  if(hHook!=NULL) ZC97Z sE  
   nHookCount++; cD'|zH]  
  return (hHook!=NULL); [5-3PuT&9  
} $T7(AohR  
BOOL UnInit() H`OJN .  
{ (9KiIRN   
 if(nHookCount>1){ ,56objaE  
  nHookCount--; `Y,<[ Lnr  
  return TRUE; 6& KcO:}-  
 } ^WUG\@B  
 BOOL unhooked = UnhookWindowsHookEx(hHook); e"cvo(}g  
 if(unhooked==TRUE){ Yan,Bt{YJ  
  nHookCount=0; -r%k)4_  
  hHook=NULL; 8Z>=sUMQ  
 } MI,kKi  
 return unhooked; (/jZ &4T  
} ]6].l$%z#  
_i2guhRs*Q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .zo>,*:t  
{ _ q^JjR  
 BOOL bAdded=FALSE; }8dS[-.  
 for(int index=0;index<MAX_KEY;index++){ P"a9+ti+'  
  if(hCallWnd[index]==0){ j>)yV@g/  
   hCallWnd[index]=hWnd; r2=4Wx4(  
   HotKey[index]=cKey; T:g=P@  
   HotKeyMask[index]=cMask; +jyWqld.K1  
   bAdded=TRUE; Lnc>O'<5P9  
   KeyCount++; [!YSW'  
   break; SquuK1P=  
  } -d *je{c |  
 } <xh";seL  
 return bAdded; 78kT}kgW  
} >dfk2.6e  
#;hYJ Y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) V5rW_X:]8  
{ [&+5E1%L  
 BOOL bRemoved=FALSE; S8Yti  
 for(int index=0;index<MAX_KEY;index++){ M,g$  
  if(hCallWnd[index]==hWnd){ Y))x'<T'Q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?@H/;hB[|  
    hCallWnd[index]=NULL; y\mK?eR  
    HotKey[index]=0; z+]YB5zK%  
    HotKeyMask[index]=0; ok/{ w  
    bRemoved=TRUE; #T08H,W/  
    KeyCount--; QBLha']'%  
    break; jfjT::f>l  
   } c=<5DC&p  
  } |g!3f  
 } PDhoCAh !  
 return bRemoved; )26_7.|  
} kz^?!l)X0  
6XI$ o,{  
void VerifyWindow() B8NMo5a  
{ :y^%I xs{1  
 for(int i=0;i<MAX_KEY;i++){ ?dY|,_O  
  if(hCallWnd!=NULL){ -GT&46hX  
   if(!IsWindow(hCallWnd)){ sW0<f& 3  
    hCallWnd=NULL; x%%OgO +>  
    HotKey=0; ^gY3))2_  
    HotKeyMask=0; u%AyW  
    KeyCount--; b 2XUZ5  
   } ,2]a<0m  
  } Qn`Fq,uvL  
 } en-HX3'  
} gJ?Vk<hp  
M"E7= J  
BOOL CHookApp::InitInstance() oNp(GQ@0  
{ Z?)=4|  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); >=d%t6 %(  
 hins=AfxGetInstanceHandle(); kGW4kuh)/q  
 InitHotkey(); T*qSk!  
 return CWinApp::InitInstance(); aS&,$sR  
} c. 06Sw*  
a$]i8AeG  
int CHookApp::ExitInstance() x"{WLZ   
{ u9D#5NvGs  
 VerifyWindow(); >_SqM!^v  
 UnInit();  TgvBy  
 return CWinApp::ExitInstance(); `-[|@QNFz  
} YxWA] yL  
@]@6(To  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file A3Oe=rB  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Gk]6WLi  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ?(>fB2^  
#if _MSC_VER > 1000 eY8rm  
#pragma once d< b,].  
#endif // _MSC_VER > 1000 */y (~O6  
.a7!*I#g  
class CCaptureDlg : public CDialog P:fcbfH+  
{ E @7);i5K  
 // Construction x#}{z1op9  
 public: g @qrVQv  
  BOOL bTray; h4tAaPcS+  
  BOOL bRegistered; LuvRxmQ`  
  BOOL RegisterHotkey(); ' ;3#t(J;  
  UCHAR cKey; !b8.XGo  
  UCHAR cMask; Q[MWzsx  
  void DeleteIcon(); h9I vuv'  
  void AddIcon(); v 6KRE3:V  
  UINT nCount; UflS`  
  void SaveBmp(); Wph@LRB]  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor v&Oc,W  
  // Dialog Data 2dnyIgi  
  //{{AFX_DATA(CCaptureDlg) w=QW8q?  
  enum { IDD = IDD_CAPTURE_DIALOG }; F-PQ`@ZNW  
  CComboBox m_Key; -;j ' =?  
  BOOL m_bControl; 69$gPY'3  
  BOOL m_bAlt; =p>IP"HJ  
  BOOL m_bShift; tWaM+W  
  CString m_Path; Lb}$)AcC  
  CString m_Number; GDY=^r  
  //}}AFX_DATA  $M|  
  // ClassWizard generated virtual function overrides /<Yz;\:Jy  
  //{{AFX_VIRTUAL(CCaptureDlg) NM4b]>   
 public: `]j:''K  
  virtual BOOL PreTranslateMessage(MSG* pMsg); bz|-x"qk  
 protected: dT'd C  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?XB[awTD~  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); R_2T"  
  //}}AFX_VIRTUAL J4#rOS  
  // Implementation nWFU8u%  
 protected: 6D/K=-   
  HICON m_hIcon; Q|(G -  
  // Generated message map functions m#`1.5%  
  //{{AFX_MSG(CCaptureDlg) XB;C~:  
  virtual BOOL OnInitDialog(); $u%7]]Y^\  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ^!rAT1(/_  
  afx_msg void OnPaint(); #}S<O_  
  afx_msg HCURSOR OnQueryDragIcon(); R?iC"s!  
  virtual void OnCancel(); T.pc3+B8N  
  afx_msg void OnAbout(); THY=8&x)  
  afx_msg void OnBrowse(); Y>Fh<"A|$  
  afx_msg void OnChange(); 2k M;7:  
 //}}AFX_MSG 4x|\xg( l  
 DECLARE_MESSAGE_MAP() 4KB>O)YNg'  
}; W[t0hbV w  
#endif 1h#e-Oyff  
L)X[$:  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 7~!F3WT{  
#include "stdafx.h" nd,2EX<bE  
#include "Capture.h" <5o oML]nP  
#include "CaptureDlg.h" F}c}I8Ao  
#include <windowsx.h> GBYwS{4  
#pragma comment(lib,"hook.lib") ):7mK03J  
#ifdef _DEBUG :N64FR#  
#define new DEBUG_NEW xl ,(=L]  
#undef THIS_FILE Y+!z]S/x  
static char THIS_FILE[] = __FILE__;  i)= \-C  
#endif ndHUQ$/(  
#define IDM_SHELL WM_USER+1 `l0"4 [?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U?=-V8#M|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +d=w%r)  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; PnZY%+[I  
class CAboutDlg : public CDialog #AF.1;(k  
{ `oOVR6{K9  
 public: s y>}2orj~  
  CAboutDlg(); +;bP.[Z  
  // Dialog Data B3&C=*y  
  //{{AFX_DATA(CAboutDlg) )4^Sz&\  
  enum { IDD = IDD_ABOUTBOX }; S`pBEM  
  //}}AFX_DATA C_;A~iI7  
  // ClassWizard generated virtual function overrides dfT  
  //{{AFX_VIRTUAL(CAboutDlg) /a }` y  
 protected: K)W:@,*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ZKt`>KZ  
  //}}AFX_VIRTUAL !OV+=Rwdx  
  // Implementation e#!p6+#"  
 protected: 2?@Ozr2Uh  
  //{{AFX_MSG(CAboutDlg) Xx1eSX  
  //}}AFX_MSG t&Jrchk  
  DECLARE_MESSAGE_MAP() 7gE/g`"#  
}; c7A]\1 ~  
9QHV%%  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) y'C  
{ 5#~E[dr  
 //{{AFX_DATA_INIT(CAboutDlg) <-"[9 w  
 //}}AFX_DATA_INIT w+gPU1|(r  
} KJ cuZ."wX  
FD/=uIXH2  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) @  \*Zq  
{ IlZ$Jd  
 CDialog::DoDataExchange(pDX); YI?tmqzt  
 //{{AFX_DATA_MAP(CAboutDlg) 6 #k mV  
 //}}AFX_DATA_MAP "'~&D/7  
} 5DL(#9F8b9  
.*&F  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) &M7AM"9  
 //{{AFX_MSG_MAP(CAboutDlg) v)JS4KS  
 // No message handlers !q 9PO  
 //}}AFX_MSG_MAP RV),E:?  
END_MESSAGE_MAP() byPqPSY  
UZ!It>  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) |#zj~>7?  
: CDialog(CCaptureDlg::IDD, pParent) ^1bM=9]F0  
{ |Q$Dj!!1P  
 //{{AFX_DATA_INIT(CCaptureDlg) bzh:  
  m_bControl = FALSE; O+t'E9Fa  
  m_bAlt = FALSE; =g$%jM>35  
  m_bShift = FALSE; cToT_Mk  
  m_Path = _T("c:\\"); %[on.Q'1]2  
  m_Number = _T("0 picture captured."); '#>(JN5\  
  nCount=0; ZQAiuea  
  bRegistered=FALSE; yT[)V[}  
  bTray=FALSE; \7G.anY  
 //}}AFX_DATA_INIT 5% w08  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \S>GtlQbn  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); d$y?py  
} {T3~js   
7GRPPh<4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) a}[rk*QmZ  
{ n( zzH  
 CDialog::DoDataExchange(pDX); t@jke  
 //{{AFX_DATA_MAP(CCaptureDlg) )H+p6<  
  DDX_Control(pDX, IDC_KEY, m_Key); L=&}s[5  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ; jrmr`l=  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ak zKX}  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); c]NZG n*  
  DDX_Text(pDX, IDC_PATH, m_Path); 1cD  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ~)*uJ wW/a  
 //}}AFX_DATA_MAP ] -%B4lT  
} =lL)g"x X  
Tr, zV  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 3[<D"0#},  
//{{AFX_MSG_MAP(CCaptureDlg) 0F6~S   
 ON_WM_SYSCOMMAND() r%%@~ \z  
 ON_WM_PAINT() rN'}IS@5  
 ON_WM_QUERYDRAGICON() |OIU)53A-  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Se>v|6  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 95Q^7oI  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ,3Nna:~f  
//}}AFX_MSG_MAP ?;ZnD(4?  
END_MESSAGE_MAP() $`<-;kI  
V6_~"pRR=  
BOOL CCaptureDlg::OnInitDialog() L&&AK`Ur3l  
{ <GSp%r  
 CDialog::OnInitDialog(); :VE0eJ]J6  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); );{76  
 ASSERT(IDM_ABOUTBOX < 0xF000); %$=2tfR  
 CMenu* pSysMenu = GetSystemMenu(FALSE); fni7HBV?  
 if (pSysMenu != NULL) szp.\CMz  
 { sU/vXweky"  
  CString strAboutMenu; NMESGNa)z  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 9]:F!d/  
  if (!strAboutMenu.IsEmpty()) p tlag&Z  
  { )1f.=QZN^;  
   pSysMenu->AppendMenu(MF_SEPARATOR); T-Yb|@4  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); G)&!f)6  
  } _po5j;"_O  
 } rLA^ &P:  
 SetIcon(m_hIcon, TRUE); // Set big icon L$ZsNs+  
 SetIcon(m_hIcon, FALSE); // Set small icon [^gb6W9Y  
 m_Key.SetCurSel(0); o90[,  
 RegisterHotkey(); N'Vj& DWC  
 CMenu* pMenu=GetSystemMenu(FALSE); 1z_1Hl  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ~Xc1y!"9*  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); yUs/lI, Q  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); #I#_gjJkx  
 return TRUE; // return TRUE unless you set the focus to a control +1c[!;'  
} S$/SFB$)~W  
60l!3o"p!  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) y0'WB`hNQ  
{ I(<Trn  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) umt(e:3f5  
 { -/_hO$|W  
  CAboutDlg dlgAbout; rdH^"(  
  dlgAbout.DoModal(); ?(M]'ia{  
 } G> s qfYkK  
 else mteQRgC  
 { _)6r@fZ.p  
  CDialog::OnSysCommand(nID, lParam); r(<91~Ww  
 } .Dy2O*`  
} o1H6E1$=  
B/B`=%~5_^  
void CCaptureDlg::OnPaint() .e\PCf9v  
{ lDVgW}o@  
 if (IsIconic()) ^G "Qp8 "  
 { G6qFAepwi  
  CPaintDC dc(this); // device context for painting }S{VR(i`J  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); lYU?j|n  
  // Center icon in client rectangle # S0N`V  
  int cxIcon = GetSystemMetrics(SM_CXICON); pL: r\Y:R  
  int cyIcon = GetSystemMetrics(SM_CYICON); <3x:nH @  
  CRect rect; 1";s #Jq  
  GetClientRect(&rect); <ka zV<"  
  int x = (rect.Width() - cxIcon + 1) / 2; :wfN+g=  
  int y = (rect.Height() - cyIcon + 1) / 2; uCgJ F@  
  // Draw the icon be [E^%  
  dc.DrawIcon(x, y, m_hIcon); i]& >+R<6  
 } L;=LAQ6[  
 else 4^!%>V"d/  
 { |#Q0UM|'Q  
  CDialog::OnPaint(); ~|ha9 1  
 } wdIJ?\/763  
} =[0| qGzg  
q-S#[I+g  
HCURSOR CCaptureDlg::OnQueryDragIcon() tO3#kV\,  
{ (W#^-*$R  
 return (HCURSOR) m_hIcon; CDT;AdRw7  
} )U{\c2b  
$p*.[)  
void CCaptureDlg::OnCancel() [}5mi?v  
{ gCbS$Pw  
 if(bTray) Q1(4l?X@  
  DeleteIcon(); WsT   
  CDialog::OnCancel(); VdGpreRPC  
} -4obX  
2`Ihrz6  
void CCaptureDlg::OnAbout() k|$?b7)"@  
{ kpMo7n  
 CAboutDlg dlg; H% FP!03  
 dlg.DoModal(); 9{Igw"9ck  
} 3il$V78|  
;,xM*  
void CCaptureDlg::OnBrowse() s\ Ln  
{ TV/EC#48  
 CString str; BC#O.93`  
 BROWSEINFO bi; (~fv;}}v  
 char name[MAX_PATH]; /)sP<WPQ 6  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); F6_e n z  
 bi.hwndOwner=GetSafeHwnd(); '_ys4hz}  
 bi.pszDisplayName=name; {9{PU&?(  
 bi.lpszTitle="Select folder"; ei~f1$zc#h  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; YR[I,j  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 9x eg,#1  
 if(idl==NULL) BadnL<cj]  
  return; BN6cu9a  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Z_mQpt|y  
 str.ReleaseBuffer(); 2"WP>>b80  
 m_Path=str; ER;\Aes*?  
 if(str.GetAt(str.GetLength()-1)!='\\') Q'YakEv >=  
  m_Path+="\\"; BE!l{  
 UpdateData(FALSE); J|([(  
} TY?O$d2b3  
 m=a^t  
void CCaptureDlg::SaveBmp() -op)X>  
{ fnIF<Zt  
 CDC dc; c GyBml1  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); tRNMiU  
 CBitmap bm; U[z2{\  
 int Width=GetSystemMetrics(SM_CXSCREEN); f<y3/jl4  
 int Height=GetSystemMetrics(SM_CYSCREEN); a3,A_M}M'  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 6#ktw)e  
 CDC tdc; MjK<n[.  
 tdc.CreateCompatibleDC(&dc); 4~2 9,  
 CBitmap*pOld=tdc.SelectObject(&bm); 7Rn 4gT  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6=S z5MC  
 tdc.SelectObject(pOld); &AVX03P  
 BITMAP btm; )5u#'5I>  
 bm.GetBitmap(&btm); Iu^I?c[  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; |W}D_2  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 0 c ]]  
 BITMAPINFOHEADER bih;   `#l1  
 bih.biBitCount=btm.bmBitsPixel; +}eK8>2  
 bih.biClrImportant=0; c=aZ[  
 bih.biClrUsed=0; *;Z a))  
 bih.biCompression=0; uUe#+[bD  
 bih.biHeight=btm.bmHeight; A o@WTs9  
 bih.biPlanes=1; <4CqG4}Y  
 bih.biSize=sizeof(BITMAPINFOHEADER); M|R\[ Zf  
 bih.biSizeImage=size; 3,J{!  
 bih.biWidth=btm.bmWidth; V;gC[7H  
 bih.biXPelsPerMeter=0; L1&` 3a?pL  
 bih.biYPelsPerMeter=0; (0Jr<16si$  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Pfd%[C/vdm  
 static int filecount=0; P G zwS  
 CString name; I:1Pz|$`  
 name.Format("pict%04d.bmp",filecount++); xpI8QV$#  
 name=m_Path+name; aO 2zD<d  
 BITMAPFILEHEADER bfh; )k]{FM  
 bfh.bfReserved1=bfh.bfReserved2=0; ]ZH6 .@|  
 bfh.bfType=((WORD)('M'<< 8)|'B'); s+^1\  
 bfh.bfSize=54+size; /JIVp_-p  
 bfh.bfOffBits=54; Nw%^Gs<~  
 CFile bf; tg<bVA)E'J  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ l-5O5|C  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ($ gmN 4  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); AdbTI#eY  
  bf.WriteHuge(lpData,size); sXYXBX[  
  bf.Close(); 5C9 .h:c4y  
  nCount++; {c7@`AV]  
 } X^i3(N  
 GlobalFreePtr(lpData); vzF6e eaD  
 if(nCount==1) ONUa7  
  m_Number.Format("%d picture captured.",nCount); j"+6aD/lv  
 else :*-O;Yw?S@  
  m_Number.Format("%d pictures captured.",nCount); !uA'0U?ky  
  UpdateData(FALSE); c?6(mU\x  
} +~7[T/v+n  
[8vqw(2Tm(  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) =FM rVE  
{ Z7 ++c<|p  
 if(pMsg -> message == WM_KEYDOWN) b,47 EJ}  
 { 3TN'1D ei  
  if(pMsg -> wParam == VK_ESCAPE) Jg$ NYs.xZ  
   return TRUE; Q+'fTmT[,  
  if(pMsg -> wParam == VK_RETURN) nYO$ |/e  
   return TRUE; -6^Ee?"  
 } ony;U#^T  
 return CDialog::PreTranslateMessage(pMsg); pP%+@;  
} g_eR&kuh  
lq?N>~PG  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) xXJzE|)1h!  
{ M >i *e  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ u3DFgl3-7  
  SaveBmp(); g@ ]1H41  
  return FALSE; d <zD@ z  
} BWr!K5w>i  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ B)dd6R>8  
 CMenu pop; mS.!lkV  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Ds@K%f(.?w  
 CMenu*pMenu=pop.GetSubMenu(0); >b~Q%{1  
 pMenu->SetDefaultItem(ID_EXITICON); !Nbi&^k B  
 CPoint pt; `.wgRUhFH;  
 GetCursorPos(&pt); w1 A-_  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); }IQ![T5  
 if(id==ID_EXITICON)  [geT u  
  DeleteIcon(); |7.X)h`  
 else if(id==ID_EXIT) Z*(OcQ-  
  OnCancel(); bNoZ{ 7  
 return FALSE; gL1r"&^L  
} QwuSo{G  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Ko "JH=<  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) \?^ EFA+;  
 AddIcon(); S)"vyGv  
 return res; k1LbWR1%wB  
} hJX;/~L  
% QaWg2Y=  
void CCaptureDlg::AddIcon() 9gZS )MZ  
{ !_?HSDAj"n  
 NOTIFYICONDATA data; Ey_mK\'  
 data.cbSize=sizeof(NOTIFYICONDATA); WK.,q>#  
 CString tip; nVGOhYn  
 tip.LoadString(IDS_ICONTIP); !H @nAz  
 data.hIcon=GetIcon(0); UaHN*@  
 data.hWnd=GetSafeHwnd(); W7 +Q&4Y  
 strcpy(data.szTip,tip); ]ij:>O@{$  
 data.uCallbackMessage=IDM_SHELL; 5yp  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; E.yc"|n7l2  
 data.uID=98; j92+kq>Xd  
 Shell_NotifyIcon(NIM_ADD,&data); 3>^B%qg6  
 ShowWindow(SW_HIDE); {s?hXB  
 bTray=TRUE; HBw0 N?  
} }~#qDrK  
s3~6[T?8  
void CCaptureDlg::DeleteIcon() / $'M  
{ ])WIw'L!  
 NOTIFYICONDATA data; RC!T1o~L  
 data.cbSize=sizeof(NOTIFYICONDATA); W#^p%?8pR  
 data.hWnd=GetSafeHwnd(); ?MiMwVR  
 data.uID=98; u7-0?  
 Shell_NotifyIcon(NIM_DELETE,&data); x o72JJ  
 ShowWindow(SW_SHOW); 3>z+3!I z  
 SetForegroundWindow(); uW,rmd  
 ShowWindow(SW_SHOWNORMAL); @!(V0-  
 bTray=FALSE; J^Wqa$<;"  
} OW8TiM mK  
[VOw:|Tt  
void CCaptureDlg::OnChange() ;bq EfV0`2  
{ hiaTJE|J?  
 RegisterHotkey(); =I+5sCF{g  
} &<C&(g{Z  
11JO[  
BOOL CCaptureDlg::RegisterHotkey() y{nX 6  
{ 9(BB>o54r  
 UpdateData(); o2LUB)=R'  
 UCHAR mask=0; <Q.-WV]Z  
 UCHAR key=0; `=8G?3  
 if(m_bControl) U9RpHh`  
  mask|=4; jLBwPI_g  
 if(m_bAlt) o5NrDDH  
  mask|=2; E8We2T[^M  
 if(m_bShift) |U="B4  
  mask|=1; td2bL4  
  key=Key_Table[m_Key.GetCurSel()]; q -^Z=,<  
 if(bRegistered){ }5"19 Go?  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); @'S !G"\  
  bRegistered=FALSE; }$s._)a  
 } r}t%DH  
 cMask=mask; uC1v^!D  
 cKey=key; et}s yPH  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); w"j[c#vM  
 return bRegistered; dJZ 9mP!d  
} glWa?#1  
v=+>ids  
  四、小结 N)$yBzN  
[m]O^Hp{{  
  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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