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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: [<{Kw=X__2  
  u&9 r2R959  
  一、实现方法 ]_8qn'7  
#fL8Kq  
  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: 9{$<0,?  
*JaqTI,e  
#pragma data_seg("shareddata") IhBp%^H0-  
HHOOK hHook =NULL; //钩子句柄 +]|Z%;im  
UINT nHookCount =0; //挂接的程序数目 ]a! xUg!S  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 WJ d%2pO]  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Rt{B(L.?<  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ynB_"mg  
static int KeyCount =0; 6sE{{,OGB  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 "F}'~HWZp  
#pragma data_seg() }->.k/vc  
yY&3p1AxW]  
  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。 0V{(Ru.O  
i:cXwQG}B  
  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: 1$2D O  
[tH-D$V  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR (__yh^h:m  
cKey,UCHAR cMask) +R\vgE68  
{ A#W?2k9  
 BOOL bAdded=FALSE; wBInq~K_  
 for(int index=0;index<MAX_KEY;index++){ xy<`#  
  if(hCallWnd[index]==0){ +dP L>R  
   hCallWnd[index]=hWnd; 'Vr$MaO  
   HotKey[index]=cKey; ;=9 >MS}  
   HotKeyMask[index]=cMask; Yyfq  
   bAdded=TRUE; Y(+^;Y3U  
   KeyCount++; 8`]=C~ G  
   break; a2f^x@0k  
  } M@(^AK{mU  
 } rFZrYm  
 return bAdded; \NG C$p n  
} WA$>pG5s  
//删除热键 `T2$4>!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) G|m1.=DJm  
{ m$LVCB  
 BOOL bRemoved=FALSE; yfDAk46->6  
 for(int index=0;index<MAX_KEY;index++){ X]y )ZF26  
  if(hCallWnd[index]==hWnd){ `$604+G  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ LrCk*@  
    hCallWnd[index]=NULL; {3Y )rY!z  
    HotKey[index]=0; #Ch;0UvFF  
    HotKeyMask[index]=0; g2R@`./S  
    bRemoved=TRUE; T'#!~GpB  
    KeyCount--; #u5~0,F  
    break; G2#d $  
   } 3p*-tBOO  
  } I<=Df5M  
 } U{ ;l0 2S  
 return bRemoved; `aqrSH5^h  
} A K/z6XGy  
XTeb9h)3  
zTD@  
  DLL中的钩子函数如下: _}mK!_`  
.9|u QEL  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) l12$l<x&M  
{ &*&?0ov^"  
 BOOL bProcessed=FALSE; 1j\aH&)GH  
 if(HC_ACTION==nCode) RiO="tX'  
 { L7mz#CMWf  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 7W9~1 .SC  
   switch(wParam) 8@M'[jT  
   {  }4nT.!5  
    case VK_MENU: 5M23/= N  
     MaskBits&=~ALTBIT; !]S=z^"<  
     break; Hh kN^S,  
    case VK_CONTROL: n~Szf  
     MaskBits&=~CTRLBIT; *C,N'M<u  
     break; XNH4==4  
    case VK_SHIFT: qd!#t]  
     MaskBits&=~SHIFTBIT; l[/q%Ca'>  
     break; ~ H[%vdR  
    default: //judge the key and send message j5%qv(w  
     break; '5};M)w  
   } T 4|jz<iK]  
   for(int index=0;index<MAX_KEY;index++){ ~F#A Pt  
    if(hCallWnd[index]==NULL) 16@);Ot  
     continue; LW39YMw<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y67uH4&Vm  
    { /qxJgoa  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); c6b0*!D"}  
     bProcessed=TRUE; >$ F:*lO  
    } H/+{e,SW"  
   } [[qwaI  
  } Isovwd  
  else if((lParam&0xc000ffff)==1){ //有键按下 <4zT;:NQ  
   switch(wParam) aed+C:N  
   { DzPs!(5[I  
    case VK_MENU: ,deUsc  
     MaskBits|=ALTBIT; _@E "7<\  
     break; W@B7yP7Rz  
    case VK_CONTROL: j 0 Y  
     MaskBits|=CTRLBIT; M\yHUS6N  
     break; F^'v{@C  
    case VK_SHIFT: j??tmo  
     MaskBits|=SHIFTBIT; pN$;!  
     break; 55hyV{L%  
    default: //judge the key and send message TmiWjQv`  
     break; 6;JP76PD  
   } uu>lDvR*  
   for(int index=0;index<MAX_KEY;index++){ ,QS'$n  
    if(hCallWnd[index]==NULL) pGGV\zD^  
     continue; vOgLEN&]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UE)fUTS  
    { SOH%Q_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); a`38db(z  
     bProcessed=TRUE; /Ri,>}n  
    } m;h<"]<  
   } <9\,QR)  
  } E!@/NE\-  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 k6J\Kkk(  
   for(int index=0;index<MAX_KEY;index++){ (zmNa}-  
    if(hCallWnd[index]==NULL) hrT%XJl  
     continue; o PaZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) b8HE."*t  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); u0 BMyH  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ss; 5C:*y  
   } ru(J5+H  
  } HZuiVW8  
 } &gWiu9WbS  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #7\b\~5  
} #gI&lO*\gr  
q\U4n[Zk  
  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: gr\@sx?b  
bpnv&EG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Q,n4i@E  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Q!x`M4   
` #=fA  
  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: JE9>8+  
YJc%h@_=]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \2Xx%SX  
{ lY->ucS %P  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) blmmm(|~|  
 { shy  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ,{pGP#  
  SaveBmp(); a! ?.F_T9A  
  return FALSE; iz$FcA]  
 } v}&#f&q!  
 …… //其它处理及默认处理 $kIo4$.Y$  
} @?Fx  
s1Okoxh/!V  
h*G#<M  
  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。 \.kTe<.:_  
2@4x"F]U;  
  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。 Dw*Arc+3V  
Gxo# !  
  二、编程步骤 zfirb  
/<6ywLD  
  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"; (GnVwJ<v9V  
90?,-6  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; {vLTeIxf.G  
G{/;AK  
  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; fWd~-U0M^  
j=FMYd8$y  
  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; z2.*#xTZn  
>H)^6sJ;%b  
  5、 添加代码,编译运行程序。 v;Swo("  
L#`7FaM?  
三、程序代码 Zo'/^S  
hTDV!B-_(  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL W0C{~|e  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Mp^^!AP9  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ \y[Bu^tk  
#if _MSC_VER > 1000 l_bL,-|E8  
#pragma once L7s>su|c(  
#endif // _MSC_VER > 1000 Z@;jIH4 (  
#ifndef __AFXWIN_H__ O >nK ,.  
#error include 'stdafx.h' before including this file for PCH qo)Q}0  
#endif \5t`p67Ve_  
#include "resource.h" // main symbols Xg,0/P~  
class CHookApp : public CWinApp %)BwE  
{ +{5JDyh0  
 public: -)4uYK*  
  CHookApp(); uE"5cq'B/  
  // Overrides $K+4C0wX`  
  // ClassWizard generated virtual function overrides +.S#=  
  //{{AFX_VIRTUAL(CHookApp) 2T//%ys=  
 public: di"C]" ;  
  virtual BOOL InitInstance(); ".Lhte R?  
  virtual int ExitInstance(); ub[""M?  
  //}}AFX_VIRTUAL .=>\Qq%  
  //{{AFX_MSG(CHookApp) /_ $~rW  
  // NOTE - the ClassWizard will add and remove member functions here. y T[Lzv#  
  // DO NOT EDIT what you see in these blocks of generated code ! XC*uz  
  //}}AFX_MSG I/^q+l.=`{  
  DECLARE_MESSAGE_MAP() _Wm(/ +G_|  
}; Ko1AaX(I'+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); jN31\)/i  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )`B -O::  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0|.7Kz^  
BOOL InitHotkey(); 'q{PtYr  
BOOL UnInit(); U(rr vNt:t  
#endif ]]\)=F`n77  
^^n +  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. T [i7C3QS  
#include "stdafx.h" +L^A:}L(  
#include "hook.h" jHs<s`#h  
#include <windowsx.h> [>b  '}4  
#ifdef _DEBUG mgJShn8]  
#define new DEBUG_NEW QrNL7{  
#undef THIS_FILE Q|j@#@O1  
static char THIS_FILE[] = __FILE__; nZ`2Z7!  
#endif yNhscAMNn  
#define MAX_KEY 100 877EKvsiC  
#define CTRLBIT 0x04 >D`fp  
#define ALTBIT 0x02 (n":] 8}  
#define SHIFTBIT 0x01 'f=)pc#&g  
#pragma data_seg("shareddata") %468s7Q[Mi  
HHOOK hHook =NULL; y~]I Vl"  
UINT nHookCount =0; ?l\gh1{C  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey !^>LOH>j  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ? BHWzo!  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ;+r)j"W  
static int KeyCount =0; ecY ^C3+S  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift "W_jdE6v  
#pragma data_seg() CfkNy[}=  
HINSTANCE hins; o-Q]Dk1W  
void VerifyWindow(); F9u:8;\@`  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) [}9XHhY1O=  
//{{AFX_MSG_MAP(CHookApp) 9Th32}H  
// NOTE - the ClassWizard will add and remove mapping macros here. 7U{b+=,wK  
// DO NOT EDIT what you see in these blocks of generated code! we:5gK &  
//}}AFX_MSG_MAP u'$yYzBE  
END_MESSAGE_MAP() 8}"f|6Wm  
RKo P6LGw  
CHookApp::CHookApp() qSpa4W[  
{ #U!(I#^3  
 // TODO: add construction code here, r7Q:l ?F2  
 // Place all significant initialization in InitInstance -KIVnV=&m  
} |oBdryi  
qOcG|UgF  
CHookApp theApp; PBAz` y2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9aF..  
{ 282+1X  
 BOOL bProcessed=FALSE; RXx?/\~yd;  
 if(HC_ACTION==nCode) w}U5dM`  
 { ^7~SS2t!  
  if((lParam&0xc0000000)==0xc0000000){// Key up +9Hk+.  
   switch(wParam) _ntW}})K  
   { l|ZzG4]+l  
    case VK_MENU: bn*{*=(|  
     MaskBits&=~ALTBIT; $@u^Jt, ?  
     break; 6XOpB^@  
    case VK_CONTROL: CJ}@R.Zy  
     MaskBits&=~CTRLBIT; J++sTQ(!?  
     break; O&?CoA?  
    case VK_SHIFT: n6%jhv9H  
     MaskBits&=~SHIFTBIT; Ltic_cjYd?  
     break; 6t7;}t]t  
    default: //judge the key and send message Zm; +Ku>  
     break; ZB^4(F')H  
   } #o r7T^  
   for(int index=0;index<MAX_KEY;index++){ S"KTL*9D  
    if(hCallWnd[index]==NULL) :S+U}Sm[  
     continue; E9Xk8w'+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) YW$x:  
    { >D p6@%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Za:BJ:  
     bProcessed=TRUE; IjB*myN.  
    } #Lxj )  
   } ~gi( 1<#  
  } tls6rto  
  else if((lParam&0xc000ffff)==1){ //Key down %\{?(baOA  
   switch(wParam) l>5]Wd{/  
   { bJ,=yB+0  
    case VK_MENU: 2$i 0yPv  
     MaskBits|=ALTBIT; aji~brq  
     break; WlQ&Yau  
    case VK_CONTROL: xwH|ryfs,Z  
     MaskBits|=CTRLBIT; <1g1hqK3  
     break; b1,T!xL  
    case VK_SHIFT: PcSoG\- G<  
     MaskBits|=SHIFTBIT; $Z7|t  
     break; n"d)  
    default: //judge the key and send message L%s4snE  
     break; g*AD$":  
   } Fx88 R !  
   for(int index=0;index<MAX_KEY;index++) 9uq+Ve>  
   { HH~  du  
    if(hCallWnd[index]==NULL) x+:,b~Skk  
     continue; nhX p_Z9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fddbXs0Sn  
    { .Qi1I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4\'81"e i  
     bProcessed=TRUE; seV;f^-hR  
    } b5 C}K  
   } >yT@?!/Q>'  
  } yE|} r  
  if(!bProcessed){ < ,cIc]eX  
   for(int index=0;index<MAX_KEY;index++){ m2< *  
    if(hCallWnd[index]==NULL) WWs[]zr  
     continue; h,6S$,UI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) !e\R;bYM  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ZNC?Ntw  
   } bZ22O"F  
  } ttq< )4  
 } xEZVsz  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?eVuz x  
} rIWN!@.J  
,N|R/Vk$+E  
BOOL InitHotkey() j!_^5d#d  
{ K#C56k q&  
 if(hHook!=NULL){ TYS\:ZdXF  
  nHookCount++; nTy,Jml  
  return TRUE; |`;1p@w"  
 } rKs WS~U  
 else *0@; kD=  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); W;g+R-  
  if(hHook!=NULL) >iWf7-:  
   nHookCount++; =^AZx)Kwd  
  return (hHook!=NULL); {ugKv?e ;  
} 3k[<4-  
BOOL UnInit() {*Wwu f.  
{ ~rJw$v  
 if(nHookCount>1){ Sq8Q *  
  nHookCount--; iK:qPrk-  
  return TRUE; qkG;YGio  
 } ="[](X^ l  
 BOOL unhooked = UnhookWindowsHookEx(hHook); -%gd')@SfD  
 if(unhooked==TRUE){ Y {|~A  
  nHookCount=0; 3pjYY$'  
  hHook=NULL; 0i(?LI_S  
 } {s'_zS z  
 return unhooked; JEF7hJz~  
} X*yp=qI  
4bi\$   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~Q 9)Q  
{ Xg3[v3m|  
 BOOL bAdded=FALSE; k:@Ls  
 for(int index=0;index<MAX_KEY;index++){ k^\ &.63(  
  if(hCallWnd[index]==0){ 9Kx:^~}20o  
   hCallWnd[index]=hWnd; 4lf36K ,  
   HotKey[index]=cKey; GfPz^F=ie.  
   HotKeyMask[index]=cMask; x,G6`|Hl  
   bAdded=TRUE; u#,'ys  
   KeyCount++; 5Zm_^IS  
   break; GaqG 8% .  
  } ^?xJpr%)  
 } "t&k{\$\  
 return bAdded; /lQ0`^yB  
} ko>O ~@r  
VEKITBs  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4 Wd5Goe:  
{ LA%al @  
 BOOL bRemoved=FALSE; sq|@9GS0T  
 for(int index=0;index<MAX_KEY;index++){ b!~%a  
  if(hCallWnd[index]==hWnd){ hg=G//  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ :bDn.`KG#  
    hCallWnd[index]=NULL; @M?EgVmW  
    HotKey[index]=0; w} q@VVB%  
    HotKeyMask[index]=0; Hf!4(\yN  
    bRemoved=TRUE; Ck%(G22-  
    KeyCount--; W&f Py%g  
    break; b<78K5'  
   } VCRv(Ek  
  } <@!kR$Rd  
 } @W- f{V  
 return bRemoved; W2Z]?l;vQQ  
} JP*mQzZL  
c7!`d.{90  
void VerifyWindow() )K3 vzX  
{ -\C6j  
 for(int i=0;i<MAX_KEY;i++){ o`! :Q!+  
  if(hCallWnd!=NULL){ B4&pBiG&f6  
   if(!IsWindow(hCallWnd)){ A8(PI)Ic.  
    hCallWnd=NULL; =u"|qD  
    HotKey=0; ua-|4@YO  
    HotKeyMask=0; i3j jPN!  
    KeyCount--; ',7Z1O  
   } %,D%Q~  
  } yS3s5C{C  
 } =Fl4tY#X  
} L%Q *\d  
SJ+-H83x  
BOOL CHookApp::InitInstance() 3h4"Rv=,  
{ X&X')hzIt  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); FWTl:LqFO  
 hins=AfxGetInstanceHandle(); 1M+!cX  
 InitHotkey(); Bd[Gsns  
 return CWinApp::InitInstance(); wVtBeZa  
} N6%q%7F.:  
x:lf=D lA  
int CHookApp::ExitInstance() ) <~7<.0  
{ Kp;o?5H  
 VerifyWindow(); s>I}-=.(Q  
 UnInit(); yo6IY  
 return CWinApp::ExitInstance(); 2F7R,rr  
} OAOmd 4  
&H{>7q#r  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file _lqAxWH  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) CFxs`C^  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ohk =7d.'  
#if _MSC_VER > 1000 U6PUt'Kk@  
#pragma once DR8dJ#  
#endif // _MSC_VER > 1000 J?$uNlI  
t$iU|^'uV  
class CCaptureDlg : public CDialog qChPT:a  
{ 2eYkWHi  
 // Construction 8+F2 !IM  
 public: HjD= .Q  
  BOOL bTray; GssoT<Y)Z  
  BOOL bRegistered; (qdk &  
  BOOL RegisterHotkey(); ;ecF~-oku  
  UCHAR cKey; SfT]C~#$N  
  UCHAR cMask; YN[D^;}  
  void DeleteIcon(); rt z(Jt{<  
  void AddIcon(); 7lu;lAAP  
  UINT nCount;  tvILLR  
  void SaveBmp(); v<4zcMv  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor '#?hm-Ga  
  // Dialog Data ERplDSfO-  
  //{{AFX_DATA(CCaptureDlg) X3vrD{uNU  
  enum { IDD = IDD_CAPTURE_DIALOG }; %## bg<  
  CComboBox m_Key; YQJ_t@0C  
  BOOL m_bControl; isqW?$s  
  BOOL m_bAlt; ~Tolz H!  
  BOOL m_bShift; ww*F}}(  
  CString m_Path; 0)#I5tEre  
  CString m_Number; seim?LK  
  //}}AFX_DATA [gDvAtTZ5  
  // ClassWizard generated virtual function overrides 8~7EWl  
  //{{AFX_VIRTUAL(CCaptureDlg) Y&?]t  
 public: i7_BnJJX{B  
  virtual BOOL PreTranslateMessage(MSG* pMsg); TkykI  
 protected: j*nCIxF  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support qSR %#  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ;2^=#7I?  
  //}}AFX_VIRTUAL F7d f  
  // Implementation BDA\9m^3  
 protected: ?*g]27f11  
  HICON m_hIcon; R?k1)n   
  // Generated message map functions Cv3H%g+as  
  //{{AFX_MSG(CCaptureDlg) Z(FAQ\7  
  virtual BOOL OnInitDialog(); hH~Z hB  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); azSS:=A  
  afx_msg void OnPaint(); rmhB!Lo  
  afx_msg HCURSOR OnQueryDragIcon(); Wo%&,>]<H  
  virtual void OnCancel(); f;*\y!|lg~  
  afx_msg void OnAbout(); I]h+24_S  
  afx_msg void OnBrowse(); %u#pl=k}  
  afx_msg void OnChange(); }  ?  
 //}}AFX_MSG !&X}? NK  
 DECLARE_MESSAGE_MAP() _-^@Jx[  
}; (jXgJ" m  
#endif [@(zGb8  
'del|"h!M  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file phTZUm i  
#include "stdafx.h" uE>}>6)b  
#include "Capture.h" ( mycUU%  
#include "CaptureDlg.h" [KJm&\evp  
#include <windowsx.h> N$. ''D?7D  
#pragma comment(lib,"hook.lib") tNtP+v-{  
#ifdef _DEBUG c~cYNW:  
#define new DEBUG_NEW "<kmiK/  
#undef THIS_FILE FQ[::*-  
static char THIS_FILE[] = __FILE__; btee;3`  
#endif 4&?%"2  
#define IDM_SHELL WM_USER+1 o] = &  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5dhRuc  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); b2z~C{l  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; \KG{ 11  
class CAboutDlg : public CDialog p%n}a%%I  
{ fO9e ;  
 public: % Dya-  
  CAboutDlg(); k38Ds_sW6d  
  // Dialog Data ,cS|fG  
  //{{AFX_DATA(CAboutDlg) P /Js!e<\  
  enum { IDD = IDD_ABOUTBOX }; @o8\`G  
  //}}AFX_DATA !X8:#a(  
  // ClassWizard generated virtual function overrides n U/v(lN  
  //{{AFX_VIRTUAL(CAboutDlg) <^M`U>   
 protected: !Y5O3^I=u  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &a O3N  
  //}}AFX_VIRTUAL gXG1w>  
  // Implementation #Ez>]`]TB  
 protected: ~v2_vEu}JX  
  //{{AFX_MSG(CAboutDlg) q[r|p"TGov  
  //}}AFX_MSG .' #_Z.zr  
  DECLARE_MESSAGE_MAP() H!,#Z7s  
}; 7j5l?K-  
Riw#+#r]/  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) )Nk^;[  
{ P#6y  
 //{{AFX_DATA_INIT(CAboutDlg) dqnxhN+&  
 //}}AFX_DATA_INIT C";F's)  
} &c0U\G|j  
T0v;8E e  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) w R1M_&-s  
{ _"=Yj3?G%  
 CDialog::DoDataExchange(pDX); <$_B J2Z  
 //{{AFX_DATA_MAP(CAboutDlg) R9~%ORI#;  
 //}}AFX_DATA_MAP 5|";L&`  
} 2BEF8o]Np  
&ciU`//`  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) lQY?!oj&q  
 //{{AFX_MSG_MAP(CAboutDlg) h0L *8P`t  
 // No message handlers q B5cF_  
 //}}AFX_MSG_MAP O:WFh;c  
END_MESSAGE_MAP() XX#YiG4|J  
H0_hQ:K   
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/)  5k{a(I  
: CDialog(CCaptureDlg::IDD, pParent) q3#07o_dV  
{ wz<YflF  
 //{{AFX_DATA_INIT(CCaptureDlg) weYP^>gH'  
  m_bControl = FALSE; p=V (_  
  m_bAlt = FALSE; TeSF  
  m_bShift = FALSE; F_$eu-y  
  m_Path = _T("c:\\"); !inonR  
  m_Number = _T("0 picture captured."); ayTEQS  
  nCount=0; UB|f{7~&  
  bRegistered=FALSE; HNu/b)-Rb  
  bTray=FALSE; IDyf9Zra?  
 //}}AFX_DATA_INIT tT>~;l%'  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 3V>2N)3`A  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); u(S~V+<@Z  
} Yh\ } i  
LS}dt?78`V  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ,dOd3y'y  
{ OQIQ   
 CDialog::DoDataExchange(pDX); l_Mi'}j  
 //{{AFX_DATA_MAP(CCaptureDlg) b`)^Ao:  
  DDX_Control(pDX, IDC_KEY, m_Key); 5B)Z@-x2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); <05\  
  DDX_Check(pDX, IDC_ALT, m_bAlt); WLqwntzk  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ]{;=<t6  
  DDX_Text(pDX, IDC_PATH, m_Path); $y S7u  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Y5M>&}N  
 //}}AFX_DATA_MAP R/&Bze  
} jl YnV/ ]  
Ju4={^#  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) SO^:6GuJ  
//{{AFX_MSG_MAP(CCaptureDlg) v0&E!4q*'  
 ON_WM_SYSCOMMAND() LT']3w  
 ON_WM_PAINT() [x Xa3W  
 ON_WM_QUERYDRAGICON() }c?/-ab>  
 ON_BN_CLICKED(ID_ABOUT, OnAbout)  *(5y;1KU  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) aVcQ  
 ON_BN_CLICKED(ID_CHANGE, OnChange) +dIDFSd  
//}}AFX_MSG_MAP vs}_1o  
END_MESSAGE_MAP() cD5c&+,&I  
8:E)GhX  
BOOL CCaptureDlg::OnInitDialog() N'[bA  
{ 3}V`]B#a  
 CDialog::OnInitDialog(); 6Tjj++b(*  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); #/!fLU@  
 ASSERT(IDM_ABOUTBOX < 0xF000); huVw+vAA  
 CMenu* pSysMenu = GetSystemMenu(FALSE); %v 0 I;t  
 if (pSysMenu != NULL) GZXBzZ}  
 { S3EM6`q'  
  CString strAboutMenu; c@H:?s!0R  
  strAboutMenu.LoadString(IDS_ABOUTBOX); e }>8rnR{  
  if (!strAboutMenu.IsEmpty()) -v"\WmcS  
  { ~u| k1  
   pSysMenu->AppendMenu(MF_SEPARATOR); ClZ:#uMbN  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); {nTQc2T?;  
  } )*< =:  
 } {!h|(xqN+  
 SetIcon(m_hIcon, TRUE); // Set big icon (s`oJLW>  
 SetIcon(m_hIcon, FALSE); // Set small icon ;{'{*g[  
 m_Key.SetCurSel(0); mRVE@ pc2X  
 RegisterHotkey(); p4mlS  
 CMenu* pMenu=GetSystemMenu(FALSE); DL0jA/f  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); P5 f p!YF  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND);  "";[U  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); IoUQ~JviA  
 return TRUE; // return TRUE unless you set the focus to a control ;\~{79c  
} {@j0?s  
?S&pq?   
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) f44b=,Lry5  
{ /O@'XWW  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 3u]#Ra~5  
 { %g1{nGah  
  CAboutDlg dlgAbout; 15PFnk6E|  
  dlgAbout.DoModal(); &.XYI3Ab1  
 } 2(SK}<X  
 else $@]tTz;b  
 { N$u;Q(^  
  CDialog::OnSysCommand(nID, lParam); Bqo8G->  
 } 2BTFK"=U  
} F<SCW+>z2a  
7kDX_,i  
void CCaptureDlg::OnPaint() pPr/r& r  
{ yL =*yC  
 if (IsIconic()) B<)c{kj  
 { (S ~|hk^  
  CPaintDC dc(this); // device context for painting q:Lw!'Z h  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); %4X#|22n  
  // Center icon in client rectangle }9Yd[`  
  int cxIcon = GetSystemMetrics(SM_CXICON); N 6CWEIJ  
  int cyIcon = GetSystemMetrics(SM_CYICON); 8S;]]*cD~  
  CRect rect; ( `V  
  GetClientRect(&rect); NpS*]vSO  
  int x = (rect.Width() - cxIcon + 1) / 2; +RIG8w]  
  int y = (rect.Height() - cyIcon + 1) / 2; ;Y:_}kN8_  
  // Draw the icon wPhN_XV  
  dc.DrawIcon(x, y, m_hIcon); {a>a?fVU  
 } J LOTl.  
 else "zU}]|R  
 { Z+jgFl 4  
  CDialog::OnPaint(); B(}u:[ b^S  
 } zk)9tm;i{  
} bj6-0`  
5_4Y/2_|  
HCURSOR CCaptureDlg::OnQueryDragIcon() f<!3vAh  
{ OC0dAxq  
 return (HCURSOR) m_hIcon; lZyxJDZ A  
} ~(%TQY5  
;Od;q]G7L  
void CCaptureDlg::OnCancel() zj G>=2  
{ K \?b6;ea  
 if(bTray) fC!]MhA"i  
  DeleteIcon(); O0`k6$=6r  
  CDialog::OnCancel(); T<!&6,N A  
} &[]0yNG  
mDn*v( f  
void CCaptureDlg::OnAbout() NzRpI5\.  
{ hY5G=nbO*  
 CAboutDlg dlg; Qg dHIMY  
 dlg.DoModal(); OG\TrW-ug  
} h/9{E:ML  
vfW  
void CCaptureDlg::OnBrowse() _ZgIm3p0A  
{ SG6@Rn*^  
 CString str; WdXi  
 BROWSEINFO bi; E1,Sr?'  
 char name[MAX_PATH]; <8yv(  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); r[P5 ufy2]  
 bi.hwndOwner=GetSafeHwnd(); \/8 I6a=  
 bi.pszDisplayName=name; }*+?1kv  
 bi.lpszTitle="Select folder"; b_Us%{  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Y6(I %hE`  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 2FHWOy /N@  
 if(idl==NULL) [qhQj\cK  
  return; x"kc:F  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); E\U6n""]  
 str.ReleaseBuffer(); >Le L%$  
 m_Path=str; 0Xmp)_vba  
 if(str.GetAt(str.GetLength()-1)!='\\') *&VH!K#@{  
  m_Path+="\\"; ]fH U/%  
 UpdateData(FALSE); YmP`Gg#> p  
} WBS~e  
esCm`?qCP  
void CCaptureDlg::SaveBmp() LqnN5l@ _B  
{ np|3 os  
 CDC dc; #*^vd{fl  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); v ?b9TE  
 CBitmap bm; cP[3p :  
 int Width=GetSystemMetrics(SM_CXSCREEN); Y,O)"6ev  
 int Height=GetSystemMetrics(SM_CYSCREEN); K/;FP'.  
 bm.CreateCompatibleBitmap(&dc,Width,Height); =$`xis\  
 CDC tdc; nBs%k!RR  
 tdc.CreateCompatibleDC(&dc); 6< x0e;>  
 CBitmap*pOld=tdc.SelectObject(&bm); v,t&t9}/  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Z5aU7  
 tdc.SelectObject(pOld); T( @y#09  
 BITMAP btm; D3#/*Ky  
 bm.GetBitmap(&btm); e(/~;"r{  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Kfnn;  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); !6_lD 0  
 BITMAPINFOHEADER bih; fm2,Mx6  
 bih.biBitCount=btm.bmBitsPixel; :O:Rfmr~  
 bih.biClrImportant=0; p8<Y5:`  
 bih.biClrUsed=0; uWw4l"RK`  
 bih.biCompression=0; a/ !!Y@7  
 bih.biHeight=btm.bmHeight; M7"I]$|\  
 bih.biPlanes=1; /60 `"xH  
 bih.biSize=sizeof(BITMAPINFOHEADER); k|W=kt$P  
 bih.biSizeImage=size; V$u~}]z  
 bih.biWidth=btm.bmWidth; Uq/#\7/rL  
 bih.biXPelsPerMeter=0; *0ZL@Kw  
 bih.biYPelsPerMeter=0; reml|!F-)  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); `+17 x<N  
 static int filecount=0; wD>tR SW  
 CString name; W69 -,w/  
 name.Format("pict%04d.bmp",filecount++); ?qr-t+  
 name=m_Path+name; EL+6u>\- k  
 BITMAPFILEHEADER bfh; <b!ieK?\F3  
 bfh.bfReserved1=bfh.bfReserved2=0; B<c7&!B  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Ojj:YLlY>  
 bfh.bfSize=54+size; mIVnc`3s  
 bfh.bfOffBits=54; hQ&S*f&='  
 CFile bf; '$u3i #. \  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ y3T- ^  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ;=X6pK  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); m7X&"0X  
  bf.WriteHuge(lpData,size); *OU>s;"$  
  bf.Close(); 0wZ_;FN*-  
  nCount++; 0T2h3,  
 } P;[5#-e  
 GlobalFreePtr(lpData); %+oWW5q7  
 if(nCount==1) Z;shFMu  
  m_Number.Format("%d picture captured.",nCount); &fA`Od6l"  
 else BQVpp,]  
  m_Number.Format("%d pictures captured.",nCount); IdTeue  
  UpdateData(FALSE); K7}EL|Kx  
} U#G[#sd> K  
Saa# Mj`M  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]bO {001y,  
{ !!&H'XEJV  
 if(pMsg -> message == WM_KEYDOWN) T[M?:~  
 { .58>KBj(  
  if(pMsg -> wParam == VK_ESCAPE) BMU}NZA  
   return TRUE; 8[(eV.  
  if(pMsg -> wParam == VK_RETURN) DQW^;Ls  
   return TRUE; :$d3}TjsA+  
 } vPEL'mw/3#  
 return CDialog::PreTranslateMessage(pMsg); 2%0z PflT  
} GL&ri!,  
|33pf7o  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) fI} Z`*  
{ E :*!an  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ {:40Jf  
  SaveBmp(); }Q_IqI[7  
  return FALSE; /b,M492  
} 3:jKuOX  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ N;tUrdgQ  
 CMenu pop; Gxv@a   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); x P{L%.  
 CMenu*pMenu=pop.GetSubMenu(0); {'Nvs_{6  
 pMenu->SetDefaultItem(ID_EXITICON); STu!v5XY}-  
 CPoint pt; I z~#G6]M  
 GetCursorPos(&pt); )c5 M;/s  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %lz\w{  
 if(id==ID_EXITICON) )0`;leli  
  DeleteIcon(); '-3AWBWI1  
 else if(id==ID_EXIT) :FwXoJc_+5  
  OnCancel(); <.( IJ  
 return FALSE; [CBA Lj5  
} <&TAN L  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); #T Cz$_=t  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~R-S$qizAC  
 AddIcon(); (: 2:_FL  
 return res; EU]{S=T  
} *MW)APw=  
`48jL3|  
void CCaptureDlg::AddIcon() _z\oDd`'  
{ 1i#uKKwE  
 NOTIFYICONDATA data; ??12 J#  
 data.cbSize=sizeof(NOTIFYICONDATA); 53P\OG^G`  
 CString tip; s4P8PDhz  
 tip.LoadString(IDS_ICONTIP); E4[ |=<  
 data.hIcon=GetIcon(0); _CAW D;P  
 data.hWnd=GetSafeHwnd(); f!ehq\K1k  
 strcpy(data.szTip,tip); wx -NUTRim  
 data.uCallbackMessage=IDM_SHELL; epj]n=/}[  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 6kGIO$xJ)  
 data.uID=98; (f5!36mz  
 Shell_NotifyIcon(NIM_ADD,&data); ][S<M24]Q  
 ShowWindow(SW_HIDE); K`* 8 *k{  
 bTray=TRUE; pBiC  
} "5Oog<  
QD]Vfj4+  
void CCaptureDlg::DeleteIcon() \lCr~D5  
{ ESiNW&u2  
 NOTIFYICONDATA data; "UKX~}8T  
 data.cbSize=sizeof(NOTIFYICONDATA); >Mj :'  
 data.hWnd=GetSafeHwnd(); +e<P7}ZQ  
 data.uID=98; vi@a87w>  
 Shell_NotifyIcon(NIM_DELETE,&data); U`K5 DZ~  
 ShowWindow(SW_SHOW); [%;LZZgl  
 SetForegroundWindow(); j+]>x]c0  
 ShowWindow(SW_SHOWNORMAL); `GC7o DL  
 bTray=FALSE; WqqrfzlM  
} ps"crV-W  
0z&3jWWY@  
void CCaptureDlg::OnChange() #!rng]p  
{ GBu&2}  
 RegisterHotkey(); \hQ[5>  
} f3lFpS  
+N"A5U  
BOOL CCaptureDlg::RegisterHotkey() rOyK==8/Fg  
{ |@]J*Kh  
 UpdateData(); /u!I2DF  
 UCHAR mask=0; Z/sB72K1  
 UCHAR key=0; i96Pel  
 if(m_bControl) \ lP c,8)  
  mask|=4; =#^%; 66z  
 if(m_bAlt) ;nji<  
  mask|=2; x?KgEcnw2X  
 if(m_bShift) AnU,2[(  
  mask|=1; oaHg6PT!  
  key=Key_Table[m_Key.GetCurSel()]; o;{  
 if(bRegistered){ yY4*/w7*j4  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); zHG KPuk'  
  bRegistered=FALSE; 5xwztcR-  
 } @}!1Uk3ud  
 cMask=mask; ,IA0n79  
 cKey=key; Z*.fSmT8)  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); j*x8K,fN  
 return bRegistered; "u Xl  
} (u@[}!  
l] WV gu  
  四、小结 } Ga@bY6  
dI5Z*"`R9  
  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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