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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: vUvIZa  
  MY4cMMjp~  
  一、实现方法 )g9Zw_3  
[$;6LFs }  
  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: pDCQ?VW  
<i%.bfQ/-  
#pragma data_seg("shareddata") + Q}Y?([  
HHOOK hHook =NULL; //钩子句柄 mcpM<vY/H  
UINT nHookCount =0; //挂接的程序数目 c3Y\XzV3v  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 68+ 9^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 HKb8z@;%@  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ^6Hfq^ejt  
static int KeyCount =0; yFH)PQ_  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 &#w] 2~|  
#pragma data_seg() N'i%9SBcg  
a5:YP  
  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。 o[O-|XL_  
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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: I|n<B"Q6^  
@i$9c)D  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR =UM30 P/  
cKey,UCHAR cMask) go@UE2qw  
{ /al(=zf  
 BOOL bAdded=FALSE; @'/\O-  
 for(int index=0;index<MAX_KEY;index++){ 1<\@i{;xsU  
  if(hCallWnd[index]==0){ M0S}-eXc5  
   hCallWnd[index]=hWnd; pD eqBO  
   HotKey[index]=cKey; ZXFM_>y 5  
   HotKeyMask[index]=cMask; 506B =  
   bAdded=TRUE; (XX6M[M8  
   KeyCount++; T7'njaLec  
   break; >hJ$~4?  
  } |K,9EM3  
 } fJH09:@^%  
 return bAdded; ltO:./6v  
} YRfs8I^rg  
//删除热键 }'b 3'/MJ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *rXESw]BR  
{ R/Mwq#xUb  
 BOOL bRemoved=FALSE; ?nn`ud?f  
 for(int index=0;index<MAX_KEY;index++){ o6 'I%Gs  
  if(hCallWnd[index]==hWnd){ h*Rh:yCR>  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *}-X '_  
    hCallWnd[index]=NULL; I_6?Q^_uZ  
    HotKey[index]=0; <_dyUiT$J  
    HotKeyMask[index]=0; Yo/U/dB  
    bRemoved=TRUE; \|F4@  
    KeyCount--; hJ (Q^Z  
    break; 5IOOVYl  
   } ` {gkL-  
  } lQ<2Vw#Yl  
 } _[<R<&jG  
 return bRemoved; >8"oO[U5>  
} r1\c{5Wt  
'nz;|6uC  
&BY%<h0c  
  DLL中的钩子函数如下: ryB^$Kh,,  
eB%KXPhMm  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) AE={P*g  
{ 8V`NQS$  
 BOOL bProcessed=FALSE; 9TIyY`2!  
 if(HC_ACTION==nCode) h3Nwxj~E  
 { ms{:=L2$$  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Kyt.[" p  
   switch(wParam) 1XSA3;ZEc  
   {  & Gp@,t  
    case VK_MENU: A[ 9 @:z  
     MaskBits&=~ALTBIT; W2D^%;mw  
     break; CC0@RU  
    case VK_CONTROL: AON";&dLq-  
     MaskBits&=~CTRLBIT; HgvgO\`]  
     break; ?l! L )!2  
    case VK_SHIFT: ig4wwd@|  
     MaskBits&=~SHIFTBIT; %0fF_OU  
     break; r Lg(J|^  
    default: //judge the key and send message vIF=kKl9,  
     break; Sf);j0G,D  
   } )@09Y_9r  
   for(int index=0;index<MAX_KEY;index++){ X^r5su?  
    if(hCallWnd[index]==NULL) \V  /s  
     continue; p(QB5at  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) EgOAEv  
    { Jkzt=6WZ0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); X6kB R  
     bProcessed=TRUE; rbiNp6AdL  
    } |s-q+q{|  
   } }__g\?Yf  
  } R7;SZo  
  else if((lParam&0xc000ffff)==1){ //有键按下 IfzHe8>  
   switch(wParam) veFl0ILd  
   { Gtd!Y x  
    case VK_MENU: zpV@{%VSj  
     MaskBits|=ALTBIT; 9I0/KuZd O  
     break; :y==O4  
    case VK_CONTROL: ]sjYxe  
     MaskBits|=CTRLBIT; ^m;dEe&@F  
     break; ` wuA}v3!  
    case VK_SHIFT: \{AxDk{z#  
     MaskBits|=SHIFTBIT; M>D 3NY[,  
     break; |RDmY!9&  
    default: //judge the key and send message T)&J}^j  
     break; 2.u d P  
   } kT@RA}  
   for(int index=0;index<MAX_KEY;index++){ ,DK|jf  
    if(hCallWnd[index]==NULL) ;ZHKTOoK  
     continue; "D}PbT[V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a\S"d  
    { ]:i :QiYD  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); i>HipD,TD  
     bProcessed=TRUE; 7 Bm 18  
    } /%EKq+ZP  
   } >^LVj[.1  
  } D M(WYL{  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 _P 0,UgZz  
   for(int index=0;index<MAX_KEY;index++){ F, Y@  
    if(hCallWnd[index]==NULL) +Mc kR  
     continue; -}`ES]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) wUWSW<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); u 'DM?mV:-  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ]as_7  
   } #t:]a<3Y2  
  } `2c>M\c4U  
 } -CfGWO#Gbx  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Zx,R6@l  
} E{kh)-  
AWHB^}!}  
  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: e:hkWcV  
<MZ$baK  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &dF$:$'s  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Rn~FCj,-  
vZj^&/F$=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: nv1'iSEeOl  
oJe9H<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) P1;T-.X~&  
{ g9|B-1[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) [/hS5TG|7  
 { (mz5vzyw  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Z)EmX=  
  SaveBmp(); 6kuN)  
  return FALSE; &o{I9MD  
 } La48M'u  
 …… //其它处理及默认处理 3p{N7/z(  
} Zs<}{`-  
|!{Q4<  
jLX{$,  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 5%"${ywI  
&I: [ 'l!  
  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。 9 P_`IsVK  
1RM;"b/  
  二、编程步骤 vA@Kb3 ,  
s:lar4>kM  
  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"; ]2(vO0~  
_ vVw2HH  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; rGuhYYvK  
[]:;8fY  
  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; $T{,3;kt  
*6^|i}  
  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; e`k6YO  
fL.;-  
  5、 添加代码,编译运行程序。 =MDir$1Z  
]UKKy2r.  
三、程序代码 jT"P$0sJAd  
ZOc1 vj  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL fiOc;d8  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) J01w\#62pQ  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 7)$U>|=  
#if _MSC_VER > 1000 J~KWn.  
#pragma once x3=W{Fv@4  
#endif // _MSC_VER > 1000 GdG1e%y]z  
#ifndef __AFXWIN_H__ $fhrGe  
#error include 'stdafx.h' before including this file for PCH 8v@6 &ras@  
#endif 95B w;U3E  
#include "resource.h" // main symbols 1}#v<b$  
class CHookApp : public CWinApp @?iLz7SPk  
{ IGv_s+O-*  
 public: /]"&E"X"  
  CHookApp(); >JwdVy^  
  // Overrides r@FdxsCnGM  
  // ClassWizard generated virtual function overrides H`q" _p:  
  //{{AFX_VIRTUAL(CHookApp) 9 tkj:8_  
 public: &?>h#H222  
  virtual BOOL InitInstance(); Cnd70tbD )  
  virtual int ExitInstance(); $'e;ScH  
  //}}AFX_VIRTUAL _H}y7  
  //{{AFX_MSG(CHookApp) %])-+T  
  // NOTE - the ClassWizard will add and remove member functions here. y[[f?rxz>  
  // DO NOT EDIT what you see in these blocks of generated code ! txQyHQ)@  
  //}}AFX_MSG Z l.}=  
  DECLARE_MESSAGE_MAP() DLcfOOn1I  
}; kf\n  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); wVkms  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); IK5FSN]s/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w]]`/`  
BOOL InitHotkey(); d=V4,:=S  
BOOL UnInit(); )~xL_yW_X  
#endif NCYN .@J  
`GOxFDB.  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. tk"L2t  
#include "stdafx.h" ;KJJK#j  
#include "hook.h" kRs[H xI3  
#include <windowsx.h> L>+g;GJ  
#ifdef _DEBUG rt$z&#M  
#define new DEBUG_NEW 11}sRu/  
#undef THIS_FILE %AW5\ EX  
static char THIS_FILE[] = __FILE__; mN +~fu h  
#endif j[NA3Vj1P  
#define MAX_KEY 100 Je_Hj9#M\d  
#define CTRLBIT 0x04 +#8?y 5~q  
#define ALTBIT 0x02 QwXM<qG*  
#define SHIFTBIT 0x01 [M_pf2Y  
#pragma data_seg("shareddata") !P/ ]o  
HHOOK hHook =NULL; !iUdej^tx  
UINT nHookCount =0; b9ysxuUdS  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey MV6 %~T  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT lnL&v' {  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 3Gq Js  
static int KeyCount =0; @+~=h{jv<  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 3S1V^C-eBx  
#pragma data_seg() 58zs% +F  
HINSTANCE hins; ~J?O~p`&  
void VerifyWindow(); AE!WYE  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) LinARMPv  
//{{AFX_MSG_MAP(CHookApp) PbxuD*LQ.  
// NOTE - the ClassWizard will add and remove mapping macros here. '&Ox,i]t  
// DO NOT EDIT what you see in these blocks of generated code! z"o;|T:  
//}}AFX_MSG_MAP b7R#tT  
END_MESSAGE_MAP() C>7Mx{!H  
fHvQ9*T  
CHookApp::CHookApp() f^](D'L?D  
{ WS9n.opl}  
 // TODO: add construction code here, B[ae<V0 k  
 // Place all significant initialization in InitInstance $UW!tg*U&  
} heoOOP(#  
SFoF]U09  
CHookApp theApp; vM~/|)^0sW  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) i0/gyK  
{ RtH[OZu(8  
 BOOL bProcessed=FALSE; %(;jx  
 if(HC_ACTION==nCode) C&D]!Zv F  
 { W~p^AHco`  
  if((lParam&0xc0000000)==0xc0000000){// Key up Tj*o[2mD  
   switch(wParam) T[a1S?_*T  
   { ju0]~,  
    case VK_MENU: %8/Gsu;  
     MaskBits&=~ALTBIT; %\N.m/5  
     break; //@_`.  
    case VK_CONTROL: 'j#oMA{0  
     MaskBits&=~CTRLBIT; toPA@V  
     break; hor ok:{  
    case VK_SHIFT: Djx9TBZ5  
     MaskBits&=~SHIFTBIT; Noz+\O\  
     break; /' L20aN2  
    default: //judge the key and send message [?Y u3E\  
     break; OdgfvHDgW  
   } p9R`hgx  
   for(int index=0;index<MAX_KEY;index++){ ]n?a h  
    if(hCallWnd[index]==NULL) D}"\nCz}y&  
     continue; j)Kk:BFFY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a1ZGMQq!  
    { G39H@@ *O0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Q nZR  
     bProcessed=TRUE; ^q"p 8   
    } [ /*$?PXt  
   } ~cSC-|$^&  
  } !Y=s_)X  
  else if((lParam&0xc000ffff)==1){ //Key down o;FjpZ  
   switch(wParam) :eS7"EG{3  
   { Zm%}AzM  
    case VK_MENU: O8SX#,3^}  
     MaskBits|=ALTBIT; ;1S{xd*^N  
     break; ]w%7/N0R  
    case VK_CONTROL: c}Jy'F7&f  
     MaskBits|=CTRLBIT; Gcg`Knr  
     break; N\H{p %8  
    case VK_SHIFT: \^EjE  
     MaskBits|=SHIFTBIT; 0LoA-c<Ay  
     break; M7yJ2u<Ty  
    default: //judge the key and send message M<7 <L   
     break; Bx E1Ky8@A  
   } l,h#RTfry  
   for(int index=0;index<MAX_KEY;index++) IOF~V)8k=  
   { HG@!J>YaD  
    if(hCallWnd[index]==NULL) '\1%%F7  
     continue; Q9K Gf;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R.A}tV=j#  
    { 6BW-AZc  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); rd]HoFE  
     bProcessed=TRUE; }n=Tw92g  
    } .)|jBC8|}  
   } Y8.0R-:ZAN  
  } $>/J8iB  
  if(!bProcessed){ %P_\7YBC>  
   for(int index=0;index<MAX_KEY;index++){ 'Twi @I  
    if(hCallWnd[index]==NULL) C,]Q/6'>  
     continue; qTqvEa^X`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) N<Bi.\XC  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ] 5P{*  
   } 'BAe>r_Pn  
  } po=*%Zs*T  
 } 7`X"B*`~b  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); F xFK  
} K!|=)G3.`  
p: sn>Y  
BOOL InitHotkey() ;oh88,*'  
{ Q C~~  
 if(hHook!=NULL){ @pytHN8( $  
  nHookCount++; 7bsW7;C  
  return TRUE; =6  
 } z&<Rx[  
 else _?kf9.  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Tj0eW(<!s  
  if(hHook!=NULL) Zu%_kpW  
   nHookCount++; &o4L;A#&  
  return (hHook!=NULL); _I{&5V~z  
} b% $S6.  
BOOL UnInit() H/)=  
{ A ,LAA$  
 if(nHookCount>1){ dmlh;Z  
  nHookCount--; fbw {)SZ  
  return TRUE; 42z9N\ f  
 } ?N11R?8  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 7MGc+M(p  
 if(unhooked==TRUE){ BC@"WlD  
  nHookCount=0; aE,x>I 7 D  
  hHook=NULL; /f%u_ 8pV%  
 } P]y2W#Rs  
 return unhooked; J)jiI>  
} WK;p[u?~xi  
{GWcw<g.B  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) v{% /aw  
{ '2# 0UdG  
 BOOL bAdded=FALSE; =[1 W.Zt  
 for(int index=0;index<MAX_KEY;index++){ c |C12b[  
  if(hCallWnd[index]==0){ KOF!a  
   hCallWnd[index]=hWnd; VKik8)/.  
   HotKey[index]=cKey; ,nHz~Xi1t  
   HotKeyMask[index]=cMask; +nJ}+|@K  
   bAdded=TRUE; /E]4N=T  
   KeyCount++; ew`R=<mZ,7  
   break; "A/kL@-C  
  } , R^Pk6m>  
 } saRB~[6I  
 return bAdded; H>DJ-lG(  
} //LXbP3/  
;V@} oD+  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `gss(o1}  
{ { @-Q1  
 BOOL bRemoved=FALSE; :A[bqRqe  
 for(int index=0;index<MAX_KEY;index++){ ww\/$ |  
  if(hCallWnd[index]==hWnd){ k*!J,/=k  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ B=Zo0 p^  
    hCallWnd[index]=NULL; b7>;UX  
    HotKey[index]=0; 2>EIDRLJ-  
    HotKeyMask[index]=0; ~{5%~8h.0r  
    bRemoved=TRUE; Fa/i./V2  
    KeyCount--; efbt\j6@%2  
    break; vG\Wr.h0!=  
   } gdT^QM:y4$  
  } x_@ev-  
 } 10[~ki-1;  
 return bRemoved; $C[YqZO  
} a,j!B hu  
eQ9x l  
void VerifyWindow() U| N`X54  
{ 6B+ @76wH  
 for(int i=0;i<MAX_KEY;i++){ -%t0'cKn,  
  if(hCallWnd!=NULL){ n[iil$VKh  
   if(!IsWindow(hCallWnd)){ 5;|9bWH  
    hCallWnd=NULL; 1qQgAhoY  
    HotKey=0; hD$U8~zK  
    HotKeyMask=0; )(ma  
    KeyCount--; 3BSeZ:j7  
   } s-C.+9  
  } M?\)&2f[Z  
 } F~DG:x~  
} Ffhbs D  
u j:w^t ][  
BOOL CHookApp::InitInstance() Y]Fq)  -  
{ !^m5by  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); +s S*EvF  
 hins=AfxGetInstanceHandle(); K^w9@&g6  
 InitHotkey(); H@ w6.[#  
 return CWinApp::InitInstance(); 5#fLGXP  
} =x^I 5Pn  
Hou{tUm{xC  
int CHookApp::ExitInstance() M,#t7~t  
{ }40/GWp<f  
 VerifyWindow(); _c(=>  
 UnInit(); '<}7bw}+c  
 return CWinApp::ExitInstance(); !^LvNW\|  
} L,D!T&B  
cX=` Tl  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file C>03P.s4c  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Vm.u3KE  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ]{"(l(  
#if _MSC_VER > 1000 8n73MF  
#pragma once #m M&CscE  
#endif // _MSC_VER > 1000 Y"lxh/l$}  
J%A`M\  
class CCaptureDlg : public CDialog \hq8/6=4s  
{ \u/5&[;  
 // Construction 5Px.G*  
 public: IB?A]oN1{  
  BOOL bTray; Xt7'clr  
  BOOL bRegistered; '&9 a%  
  BOOL RegisterHotkey(); B{K'"uC  
  UCHAR cKey; PIrUls0}  
  UCHAR cMask; Q72wg~%w  
  void DeleteIcon(); nAX |=qp#  
  void AddIcon(); CVUJ(D&Q  
  UINT nCount; 1uH\Bn]p?  
  void SaveBmp(); SP*5 W)6  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ,AD| u_pP  
  // Dialog Data M\<!m^~  
  //{{AFX_DATA(CCaptureDlg) u+R?N% EKP  
  enum { IDD = IDD_CAPTURE_DIALOG }; 2+P3Sii  
  CComboBox m_Key; Mb9q<4  
  BOOL m_bControl; /Z% ?;  
  BOOL m_bAlt; k}O|4*.BT  
  BOOL m_bShift; 9D| FqU |  
  CString m_Path; R utW{wh  
  CString m_Number; .kYzB.3@]  
  //}}AFX_DATA +Va?wAnr  
  // ClassWizard generated virtual function overrides ,-1$Vh@wM  
  //{{AFX_VIRTUAL(CCaptureDlg) GS$k  
 public: w|Mj8Lc+  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 1Efl|lV  
 protected: "p; DQ-V  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support bOFLI#p&  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 0 iE).Za0g  
  //}}AFX_VIRTUAL eHJ7L8#  
  // Implementation b{ozt\:M  
 protected: ."^dJ |fN  
  HICON m_hIcon; 2%<jYm#'z-  
  // Generated message map functions }?~uAU-  
  //{{AFX_MSG(CCaptureDlg) O}`01A!u;  
  virtual BOOL OnInitDialog(); :aqh8b v  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); \|pAn  
  afx_msg void OnPaint(); T7T!v  
  afx_msg HCURSOR OnQueryDragIcon(); <F3sQAe  
  virtual void OnCancel(); [!q&r(-K  
  afx_msg void OnAbout(); ]EcZ|c7o9y  
  afx_msg void OnBrowse(); 0>;#vEF*1  
  afx_msg void OnChange(); {x4[Bx1  
 //}}AFX_MSG '-S&i{H  
 DECLARE_MESSAGE_MAP() 9j2I6lGQ  
}; |)4$\<d  
#endif dbuOiZ  
&`Di cfD  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ~76.S  
#include "stdafx.h" C~;0A!@]Y  
#include "Capture.h" oe*&w9Y}&  
#include "CaptureDlg.h" mce`1Tjw  
#include <windowsx.h> p)^:~ ll  
#pragma comment(lib,"hook.lib") )eFFtnu5  
#ifdef _DEBUG PJYA5"}W  
#define new DEBUG_NEW OT& E)eR  
#undef THIS_FILE M$W#Q\<*#r  
static char THIS_FILE[] = __FILE__; w.Vynb  
#endif L@_">' pR  
#define IDM_SHELL WM_USER+1 j>Z]J'P  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >YBpB,WND  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `eWc p^|  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ._&lG3'  
class CAboutDlg : public CDialog LJ/qF0L!H  
{ _tReZ(Vw  
 public: !TOi]`vqc  
  CAboutDlg(); f0`' i[  
  // Dialog Data s4gNS eA  
  //{{AFX_DATA(CAboutDlg) UvZ@"El  
  enum { IDD = IDD_ABOUTBOX }; ;a3nH  
  //}}AFX_DATA D,n}Qf!GYk  
  // ClassWizard generated virtual function overrides Xe SbA  
  //{{AFX_VIRTUAL(CAboutDlg) ?R]y}6 P$  
 protected: ye|a#a9N  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support oyt//SE  
  //}}AFX_VIRTUAL 05KoxFO?  
  // Implementation T"H )g  
 protected: JZ% F  
  //{{AFX_MSG(CAboutDlg) $vLV< y07  
  //}}AFX_MSG ,/:a77  
  DECLARE_MESSAGE_MAP() bQy%$7UmX,  
}; P082.:q"  
2E2}|: ||&  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) rH9}nL  
{ bX H^Bm  
 //{{AFX_DATA_INIT(CAboutDlg) 0#[f2X62B  
 //}}AFX_DATA_INIT VDKS_n  
} kxW>Da<6  
D i'u%r  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) <gdgcvd  
{ V0Z7o\-J  
 CDialog::DoDataExchange(pDX); @6co\.bv  
 //{{AFX_DATA_MAP(CAboutDlg) ]kkBgjQbS  
 //}}AFX_DATA_MAP G\+nWvV7  
} T4=3VrS  
n]DNxC@b  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 1 j12Qn@]  
 //{{AFX_MSG_MAP(CAboutDlg) eAsX?iaH  
 // No message handlers (Q5@MfK`  
 //}}AFX_MSG_MAP 6rQpK&Jx  
END_MESSAGE_MAP() }=hoATs  
2-V)>98  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ;hA7<loY  
: CDialog(CCaptureDlg::IDD, pParent) 2ly,l[p8  
{ N4H+_g|  
 //{{AFX_DATA_INIT(CCaptureDlg) Yc82vSG'  
  m_bControl = FALSE; WYC1rfd=  
  m_bAlt = FALSE; As+;qNO  
  m_bShift = FALSE; N 2"3~  #  
  m_Path = _T("c:\\"); vzcBo%  
  m_Number = _T("0 picture captured."); uR ;-eK  
  nCount=0; 48 CI8[T  
  bRegistered=FALSE; 7p.h{F'A  
  bTray=FALSE; Ok>(>K<r  
 //}}AFX_DATA_INIT U>_IYT  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ],F}}pv  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); w2d]96*kQe  
} XU_,Z/Yw_  
<.WM-Z  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) zNny\Z  
{ M7DLs;sD  
 CDialog::DoDataExchange(pDX); FGwnESCC  
 //{{AFX_DATA_MAP(CCaptureDlg) 6%.  
  DDX_Control(pDX, IDC_KEY, m_Key); 28R>>C=R  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 'xbERu(Y  
  DDX_Check(pDX, IDC_ALT, m_bAlt); A6N~UV*_  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); AzW7tp;t =  
  DDX_Text(pDX, IDC_PATH, m_Path); qEJ8o.D-=  
  DDX_Text(pDX, IDC_NUMBER, m_Number); F@ $RV_M  
 //}}AFX_DATA_MAP _@!QY   
} Hs%QEvZl  
< m enABN4  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) x_<bK$OU  
//{{AFX_MSG_MAP(CCaptureDlg) n#>.\F  
 ON_WM_SYSCOMMAND() vK6ibl0  
 ON_WM_PAINT() qB F!b0lr  
 ON_WM_QUERYDRAGICON() R6!cK[e]4  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) {jhmp\PN  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) "%E-X:Il#  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 7-d}pgVK  
//}}AFX_MSG_MAP {OO*iZ.O  
END_MESSAGE_MAP() OK-sT7But  
E69:bQ94u  
BOOL CCaptureDlg::OnInitDialog() PZuq'^p  
{ (/U)> %n  
 CDialog::OnInitDialog(); U|J$?aFDr  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 5fu+rU-#  
 ASSERT(IDM_ABOUTBOX < 0xF000); ,\lY Px\P[  
 CMenu* pSysMenu = GetSystemMenu(FALSE); %o@['9U[j  
 if (pSysMenu != NULL) 2f19W# '0  
 { Z'Exw-ca  
  CString strAboutMenu; xHJ8?bD p  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Q1`<fD  
  if (!strAboutMenu.IsEmpty()) 6F*-qb3  
  { heL$2dZ5H  
   pSysMenu->AppendMenu(MF_SEPARATOR); Tr8AG>  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 2(m85/Hr\;  
  } R CBf;$O  
 } : 8^M5}  
 SetIcon(m_hIcon, TRUE); // Set big icon )sW6iR&_i  
 SetIcon(m_hIcon, FALSE); // Set small icon u C,"5C  
 m_Key.SetCurSel(0); ]C16y. ~e  
 RegisterHotkey(); ;&Bna#~B  
 CMenu* pMenu=GetSystemMenu(FALSE); ]V36-%^  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ><NI'q*cQ  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); t7w-TJvP  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ~u /aOd  
 return TRUE; // return TRUE unless you set the focus to a control q=6Cc9FN  
} yo\N[h7  
EBoGJ_l  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) b , juF2  
{ M{?zvq?d  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 8 !4~T,9G  
 { b7B+eN ?z  
  CAboutDlg dlgAbout; :}y9$p  
  dlgAbout.DoModal(); Ap5}5 ewM  
 } |[S90Gw]  
 else  hv+|s(  
 { 4_PCq Ep)  
  CDialog::OnSysCommand(nID, lParam); pOC% oj  
 } f64(a\Rw!^  
} M1oPOC\0.  
$hkq>i \  
void CCaptureDlg::OnPaint() 5D,.^a1 A  
{ b4>``n  
 if (IsIconic()) m\>|C1oRy  
 { q0,kDM66   
  CPaintDC dc(this); // device context for painting O: ,$%  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); }]AT _bh,  
  // Center icon in client rectangle @j O4EEe:  
  int cxIcon = GetSystemMetrics(SM_CXICON); v*E(/}<v  
  int cyIcon = GetSystemMetrics(SM_CYICON); CSMeSPOm]  
  CRect rect; E7Ibp79}N  
  GetClientRect(&rect); nX0HT )}  
  int x = (rect.Width() - cxIcon + 1) / 2; {?E<](+0  
  int y = (rect.Height() - cyIcon + 1) / 2;  _e%dM  
  // Draw the icon g;pR^D'M5C  
  dc.DrawIcon(x, y, m_hIcon); jY7=mAd  
 } *YWk1Cwjo  
 else 00ofHZ  
 { Btj#EoSI_  
  CDialog::OnPaint(); [SVhtrx|%  
 } )4l>XlQ&  
} '|A|vCRCG  
E2@`d6  
HCURSOR CCaptureDlg::OnQueryDragIcon() ^+ZgWS^%  
{ l DN"atSf  
 return (HCURSOR) m_hIcon; A)tP()+)  
} w|IjQ1{  
! Tx&vtq  
void CCaptureDlg::OnCancel() TZ[Zm  
{ .it#`Yz;  
 if(bTray) vCw<G6tD  
  DeleteIcon(); UuU/c-.  
  CDialog::OnCancel(); *5_V*v6  
} ~q)u(W C|  
7kKuZW@K-  
void CCaptureDlg::OnAbout() 0ZMJ(C  
{ M=OCz gj  
 CAboutDlg dlg; |EKu2We*  
 dlg.DoModal(); RK[D_SmS  
} F^QQ0h]2  
{~SaRB2<'  
void CCaptureDlg::OnBrowse() E<>*(x/\e  
{ A{# Nwd>  
 CString str; "(v%1tGk  
 BROWSEINFO bi; iPq &Y*  
 char name[MAX_PATH]; hoa7   
 ZeroMemory(&bi,sizeof(BROWSEINFO)); OS-sk!  
 bi.hwndOwner=GetSafeHwnd(); ^W~p..DF  
 bi.pszDisplayName=name; &(EHq  
 bi.lpszTitle="Select folder"; j[I`\"  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; b_TS<,  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 98R KCc9h  
 if(idl==NULL) ~@T<gA9V  
  return; IOL L1ar  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Q_]d5pl  
 str.ReleaseBuffer(); 7p.>\YtoR}  
 m_Path=str; ]1D%zKY%$Z  
 if(str.GetAt(str.GetLength()-1)!='\\') -(i(02PX  
  m_Path+="\\"; k|xtrW`qo;  
 UpdateData(FALSE); Y34/+Fi  
} G O{ . 9_2  
*wuqa) q2  
void CCaptureDlg::SaveBmp() !*aPEf270  
{ "g>.{E5  
 CDC dc; )"Q*G/+2Ie  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Wy4$*$  
 CBitmap bm; t 42ub  
 int Width=GetSystemMetrics(SM_CXSCREEN); 9T7e\<8"vC  
 int Height=GetSystemMetrics(SM_CYSCREEN); ]5}=^  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 8S]".  
 CDC tdc; Xd<t5{bD!  
 tdc.CreateCompatibleDC(&dc); S4N(cn&  
 CBitmap*pOld=tdc.SelectObject(&bm); ('O}&F1  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); D-2.fjo9!  
 tdc.SelectObject(pOld); 7Vu?  
 BITMAP btm; qH> `}/,P  
 bm.GetBitmap(&btm); %dMqpY7"  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; L[g0&b%%-  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); *>NX%by)  
 BITMAPINFOHEADER bih; z0%\OhuCcf  
 bih.biBitCount=btm.bmBitsPixel; (@r `$5D.b  
 bih.biClrImportant=0; iCj2"T4TN  
 bih.biClrUsed=0; r@U3sO#N  
 bih.biCompression=0; %c|UmKKi  
 bih.biHeight=btm.bmHeight; b0v:12q  
 bih.biPlanes=1; ;{#^MD MB  
 bih.biSize=sizeof(BITMAPINFOHEADER); 26I  
 bih.biSizeImage=size;  foRD{Hx  
 bih.biWidth=btm.bmWidth; Os&n  
 bih.biXPelsPerMeter=0; Su8|R"qU  
 bih.biYPelsPerMeter=0; J-xS:Ha'l  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); yF13Of^l./  
 static int filecount=0; :O-iykXyI  
 CString name; :kMHRm@{  
 name.Format("pict%04d.bmp",filecount++); x YfD()w<I  
 name=m_Path+name; +JRF0T  
 BITMAPFILEHEADER bfh; )yG"^Ulu  
 bfh.bfReserved1=bfh.bfReserved2=0; &<y2q/U}  
 bfh.bfType=((WORD)('M'<< 8)|'B'); fX~'Zk\u  
 bfh.bfSize=54+size; aAE>)#f(  
 bfh.bfOffBits=54; :#5xA?=* S  
 CFile bf; oVvc?P  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ h.eM RdlO  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); @L/o\pvc  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); @I`C#~  
  bf.WriteHuge(lpData,size); ritBU:6  
  bf.Close(); m2~&#c\  
  nCount++; Wy .IcWK  
 } &;i "P  
 GlobalFreePtr(lpData); ;G |i^  
 if(nCount==1) ^n1%OzGK#  
  m_Number.Format("%d picture captured.",nCount); A#8q2n270*  
 else KLoE&ds  
  m_Number.Format("%d pictures captured.",nCount); JyLa#\ R  
  UpdateData(FALSE); O.G'?m<: #  
} p;T{i._iL  
h!rM^  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) +Y"r71|A6+  
{ q  h/F  
 if(pMsg -> message == WM_KEYDOWN) }`(N:p  
 { ;0rGiWC#  
  if(pMsg -> wParam == VK_ESCAPE) 'e)^m}:?D  
   return TRUE; j/`94'Y  
  if(pMsg -> wParam == VK_RETURN) k%s_0 @  
   return TRUE; <BFQ:  
 } M`YWn ;  
 return CDialog::PreTranslateMessage(pMsg); >Fio;cn?  
} 54lu2gD'  
mw$r$C{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gTl<wo +  
{ az0<5 Bq)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ }jH7iyjD  
  SaveBmp(); o?L'Pg  
  return FALSE; YB<*"HxM)}  
} ;Uc0o!1  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ qgIb/6;xQ  
 CMenu pop; c 'uhK8|  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Hy.AyU|L  
 CMenu*pMenu=pop.GetSubMenu(0); ~Q {QM:k  
 pMenu->SetDefaultItem(ID_EXITICON); !oPq?lW9  
 CPoint pt; N`iwC!  
 GetCursorPos(&pt); PZxAH9 S?  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Kl7WQg,XOi  
 if(id==ID_EXITICON) PyVC}dUAX  
  DeleteIcon(); %^sTU4D5  
 else if(id==ID_EXIT) 1"Z@Q`}  
  OnCancel(); 4iA Z+l5&  
 return FALSE; 'c2W}$q  
} XU!2YO)t;!  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -9N@$+T  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) S/|,u`g-  
 AddIcon(); :B3[:MpL}  
 return res; j',W 64  
} k@zy  
*eI)Z=8  
void CCaptureDlg::AddIcon() [Wd-Zn%  
{ b@RHc!,>jV  
 NOTIFYICONDATA data; `&\Q +W  
 data.cbSize=sizeof(NOTIFYICONDATA); theZ]5_C  
 CString tip; ahx>q  
 tip.LoadString(IDS_ICONTIP); JB!:JML  
 data.hIcon=GetIcon(0); sn7AR88M;  
 data.hWnd=GetSafeHwnd(); |*Z$E$k:  
 strcpy(data.szTip,tip); Lg8nj< TF  
 data.uCallbackMessage=IDM_SHELL; *I}`dC[  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 'iLpE7  
 data.uID=98; 4tL<q_  
 Shell_NotifyIcon(NIM_ADD,&data); ~ wg:!VWA)  
 ShowWindow(SW_HIDE); J+rCxn?;g  
 bTray=TRUE; V5+SWXZ  
} COH<Tj  
J>fQNW!{  
void CCaptureDlg::DeleteIcon() mF` B#  
{ UOQEk22  
 NOTIFYICONDATA data; +)JpUqHa  
 data.cbSize=sizeof(NOTIFYICONDATA); h(WrL  
 data.hWnd=GetSafeHwnd(); dJ$"l|$$  
 data.uID=98; fXrXV~'8  
 Shell_NotifyIcon(NIM_DELETE,&data); 93t9^9  
 ShowWindow(SW_SHOW); _|h8q-[3  
 SetForegroundWindow(); /mo(_  
 ShowWindow(SW_SHOWNORMAL); s4&^D<  
 bTray=FALSE; h-iJlm  
} rG,5[/l  
LYlDc;<A  
void CCaptureDlg::OnChange() P[s8JDqu  
{ +P.+_7+:  
 RegisterHotkey(); ^C2\`jLMY  
} U,nEbKJgk  
 KWLbD#  
BOOL CCaptureDlg::RegisterHotkey() X,9 M"E 2  
{ v<Bynd-  
 UpdateData(); ECv)v  
 UCHAR mask=0; l5L.5 $N  
 UCHAR key=0; E=){K  
 if(m_bControl) UH3sH t  
  mask|=4; eQQ>  
 if(m_bAlt) ^CwR!I.D}4  
  mask|=2; [+qCs7'  
 if(m_bShift) v[Kxja;  
  mask|=1; g{5A4|_7  
  key=Key_Table[m_Key.GetCurSel()]; >X*Mio8P#  
 if(bRegistered){ sz9L8f2  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); CI3XzH\IX*  
  bRegistered=FALSE; `/Y{ l  
 } yf&7P;A  
 cMask=mask; <&)v~-&O  
 cKey=key; @&[T _l  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Y@PI {;!  
 return bRegistered; +V&{*f)  
} o)'y.-@Q  
)BRKZQN  
  四、小结 +F dB '  
lJ@][;  
  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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