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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: >Z'NXha  
  n CdR EXw  
  一、实现方法 .=s&EEF  
EwvoQ$#jv  
  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: g\&g N  
K1M%!JKh)x  
#pragma data_seg("shareddata") TA4!$7b$  
HHOOK hHook =NULL; //钩子句柄 E>D_V@,/  
UINT nHookCount =0; //挂接的程序数目 E&[{4Ml  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 5:KQg  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Zg{KFM%  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ppVHLrUh  
static int KeyCount =0; ;EP:o%r  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 w|K'M?N14  
#pragma data_seg() 4bYK}o S  
8ap%?  
  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。 KV0]m^@x  
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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: *^VRGfpb  
YwjKAyLU  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR J^Wa8Q;9lX  
cKey,UCHAR cMask) [J?aD`{#O  
{ F^];U+J  
 BOOL bAdded=FALSE; <+?7H\b  
 for(int index=0;index<MAX_KEY;index++){ mc? Vq  
  if(hCallWnd[index]==0){ dtRwTUMe?  
   hCallWnd[index]=hWnd; paCV!tP  
   HotKey[index]=cKey; %z,m B$LY  
   HotKeyMask[index]=cMask; rWR}Stc@]  
   bAdded=TRUE; 7%x[q}  
   KeyCount++; ',JinE95  
   break; Ws|j#X<  
  } 2{H@(Vgpbr  
 } Dv5D~on{  
 return bAdded; #_^Lb]jkM  
} e#$]Y?,  
//删除热键 ;;6uw\6 O  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (ROY?5 @c  
{ 42$VhdG  
 BOOL bRemoved=FALSE; \o*5  
 for(int index=0;index<MAX_KEY;index++){ w0rRSD4S8B  
  if(hCallWnd[index]==hWnd){ D#cyOrzy  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ RO+GK`J  
    hCallWnd[index]=NULL; =.Pw`.  
    HotKey[index]=0; fg_4zUGM+g  
    HotKeyMask[index]=0; %Nlt H/I  
    bRemoved=TRUE; GfoLae  
    KeyCount--; O_oPh] x)  
    break; a*lh)l<KV  
   } IA8f*]?  
  } il4^zj82  
 } UZ\u;/}  
 return bRemoved; :}'=`wa  
} #L=x%8B  
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@vC4[:"pD}  
  DLL中的钩子函数如下: %(3|R@G.  
at#ja_ hd  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5sj4;w[  
{ 36}?dRw#p  
 BOOL bProcessed=FALSE; _mqL8ho  
 if(HC_ACTION==nCode) 3`t#UY).F  
 { (-UYB9s  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 |mxDjgq  
   switch(wParam) &#{Z( h.de  
   {  HJ=:8:  
    case VK_MENU: '}ptj@,  
     MaskBits&=~ALTBIT; h5*JkRm  
     break; lk/n}bx  
    case VK_CONTROL: #++lg{  
     MaskBits&=~CTRLBIT; .F98G/s  
     break; kyR:[+je  
    case VK_SHIFT: }|0^EWL  
     MaskBits&=~SHIFTBIT; &47i"%  
     break; E:UW#S%A f  
    default: //judge the key and send message | k&Ck  
     break; CpUk Cgg  
   } >N^Jj:~l  
   for(int index=0;index<MAX_KEY;index++){ zqimR#u  
    if(hCallWnd[index]==NULL) ^bGNq X  
     continue; CKYc\<zR0l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d~9A+m3b_  
    { a@_4PWzF:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ?&8^&brwG  
     bProcessed=TRUE; vv72x]  
    } Z;h t  
   } 9'fQHwsJ  
  } RD!&LFz/}  
  else if((lParam&0xc000ffff)==1){ //有键按下 5bRJS70M  
   switch(wParam) k :(SCHf  
   { b.2aHu( 3  
    case VK_MENU: g;H=6JeG/  
     MaskBits|=ALTBIT; pR*VdC _mY  
     break; Vh'P&W?[  
    case VK_CONTROL: @x*c1%wg  
     MaskBits|=CTRLBIT; HZ aV7dOZ8  
     break; @:oXN]+ _  
    case VK_SHIFT: kjTduZ/3 "  
     MaskBits|=SHIFTBIT; 4`4kfiS$  
     break; OV1_|##LC  
    default: //judge the key and send message w#ZoZZ wh  
     break; +^` I?1\UF  
   } +5w))9@  
   for(int index=0;index<MAX_KEY;index++){ 2Z+Wu3#  
    if(hCallWnd[index]==NULL) {j{u6i  
     continue; h0(BO*cy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _~'=C#XI)  
    { h=W:^@G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); h1j!IG  
     bProcessed=TRUE; ty8q11[8  
    } "Bh}}!13  
   } T-'OwCB1q  
  } )MtF23k)g  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 w^\52  
   for(int index=0;index<MAX_KEY;index++){ T`9lV2x*P  
    if(hCallWnd[index]==NULL) g{7.r-uu  
     continue; AuvkecuIh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) G~F b  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); B7VH<;Z  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 .yMEIUm  
   } OC_+("N  
  } zykT*V  
 } hwPw]Ln/  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %41m~Wh2  
} Mer/G2#&  
$[Sc0dzJ  
  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: +cJL7=V&  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E~DQ-z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); uu-PJTNZ  
-"R2  
  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: ?j'7l=94A  
;!>rnxB?4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) J! AgBF N4  
{ I&fozO   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) U&g@.,Y#  
 { $POu\TO  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 )cW#Rwu_A4  
  SaveBmp(); oTEL?hw5  
  return FALSE; uFX#`^r`  
 } yks__ylrl(  
 …… //其它处理及默认处理 q}b dxa  
} "0V.V>-p  
?1*cO:O  
8Q.T g.  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ])[[ V!1  
OyStqi  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 )\1QJ$-M&  
KKb,d0T[  
  二、编程步骤 46}g7skD  
.O DU  
  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"; 9Uh"iMB  
7!e vm;A  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ntu5{L'8  
v3*_9e  
  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; D.r<QO~6B  
2+RUTOv/d  
  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; VRVO-Sk  
M  f}~{+  
  5、 添加代码,编译运行程序。 c_dVWh e  
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三、程序代码 b10cuy|a/X  
tl[Uw[  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 'S20\hwt-  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) <kfnpB=  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 6gkV*|U,e  
#if _MSC_VER > 1000 /?wtF4  
#pragma once nyX2|m&  
#endif // _MSC_VER > 1000 FXpJqlhNv  
#ifndef __AFXWIN_H__ TCMCK_SQL  
#error include 'stdafx.h' before including this file for PCH +Te\H  
#endif TeMHm ?1^  
#include "resource.h" // main symbols b}2ED9HG\  
class CHookApp : public CWinApp mbKZJ{|4s  
{ kq?Ms|h  
 public: nxO"ua  
  CHookApp(); ^NLmgw Q  
  // Overrides 9d>-MX'  
  // ClassWizard generated virtual function overrides n|6Ic,:[  
  //{{AFX_VIRTUAL(CHookApp) aR[JD2G  
 public: uY{|szC^2  
  virtual BOOL InitInstance(); PoHg,n]  
  virtual int ExitInstance(); :>rkG?NfL  
  //}}AFX_VIRTUAL $1SPy|y  
  //{{AFX_MSG(CHookApp) zU,9T  
  // NOTE - the ClassWizard will add and remove member functions here. 3Lfqdqj  
  // DO NOT EDIT what you see in these blocks of generated code ! SDC4L <!  
  //}}AFX_MSG R1s`z|?  
  DECLARE_MESSAGE_MAP() AKY1o.>z  
}; Mhm@R@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); w{{gu1#]G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .nO\kgoK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &U{#Kt5q  
BOOL InitHotkey(); C/_ZUF(V  
BOOL UnInit(); @hl.lq  
#endif jxP;>K7O  
$ux,9H'[  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. +*\u :n  
#include "stdafx.h" Cw~q4A6'  
#include "hook.h" Vo4,@scG  
#include <windowsx.h> pXtl 6K%  
#ifdef _DEBUG ^Xz@`_I  
#define new DEBUG_NEW ?#Ge.D~u  
#undef THIS_FILE x" 7H5<  
static char THIS_FILE[] = __FILE__; l\f*d6o  
#endif B=U 3  
#define MAX_KEY 100 y3vdUauOn  
#define CTRLBIT 0x04 dR K?~1  
#define ALTBIT 0x02 bes<qy  
#define SHIFTBIT 0x01 4M^= nae  
#pragma data_seg("shareddata") oxr#7Ei0d  
HHOOK hHook =NULL; yyR0]NzYUD  
UINT nHookCount =0; pk>^?MO  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey IWk4&yHUAu  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Lk|hQ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey !zBhbmlKt  
static int KeyCount =0; \h+AXs<j  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift JX<)EZ!F  
#pragma data_seg() &g#@3e1>  
HINSTANCE hins; }?lrU.@zg  
void VerifyWindow(); sm9k/(-  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) _qU4Fadgm  
//{{AFX_MSG_MAP(CHookApp) C=-=_>Q,L<  
// NOTE - the ClassWizard will add and remove mapping macros here. 3W V"U  
// DO NOT EDIT what you see in these blocks of generated code! zlyS}x@p  
//}}AFX_MSG_MAP 3Nl <p"=  
END_MESSAGE_MAP() evenq$ H  
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CHookApp::CHookApp() %Celc#v  
{ 7 G)ZN{'  
 // TODO: add construction code here, qjwxhabc  
 // Place all significant initialization in InitInstance G `+T+  
} A4Rug\p]  
#HYr0Tw6`  
CHookApp theApp; 2{D{sa  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 85>05 ?  
{ PYQ;``~x  
 BOOL bProcessed=FALSE; W=lyIb{?^0  
 if(HC_ACTION==nCode) r=Gks=NX"  
 { M\vwI"  
  if((lParam&0xc0000000)==0xc0000000){// Key up Y=%tn8<  
   switch(wParam) MvuQz7M#d  
   { % BVs47g  
    case VK_MENU: ysJQb~2q  
     MaskBits&=~ALTBIT; >u>5{4  
     break; )S3\,S-.  
    case VK_CONTROL: "Hya6k>j  
     MaskBits&=~CTRLBIT; IO wj>t  
     break; o\BOL3H  
    case VK_SHIFT: LI'6R=  
     MaskBits&=~SHIFTBIT; :v0U|\j8/V  
     break; 16w|O |^<  
    default: //judge the key and send message ,k.3|aZE  
     break; B{/R: Hm  
   } f W!a|?e$  
   for(int index=0;index<MAX_KEY;index++){ !]42^?GH  
    if(hCallWnd[index]==NULL) 2iHUZzz\  
     continue; !NIhx109q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @X%C>iYa9  
    { ]Gzm^6v  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); i3dkYevs?  
     bProcessed=TRUE; <qtr   
    } Wfu(*  
   } '>NCMB{*  
  } 7jxslI&F  
  else if((lParam&0xc000ffff)==1){ //Key down ?:pP8/y  
   switch(wParam) ~Uj=^leYO  
   { ;m0~L=w  
    case VK_MENU: :Hn6b$Vy8  
     MaskBits|=ALTBIT; :uP,f<=)K  
     break; kh!FR u h  
    case VK_CONTROL: vhe>)h*B  
     MaskBits|=CTRLBIT; VdPtPq1  
     break; ?OId\'q  
    case VK_SHIFT: O $LfuL  
     MaskBits|=SHIFTBIT; rr+|Zt Y  
     break; V n7*JS  
    default: //judge the key and send message NYt&@Z}]  
     break; s0\X ^  
   } ? 8)'oMD  
   for(int index=0;index<MAX_KEY;index++) `V=N*hv`  
   { G"klu  
    if(hCallWnd[index]==NULL) grS:j+_M2m  
     continue; ;i8g41qjF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) . kQkC:~9  
    { M*y)6H k~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ^({})T0wu  
     bProcessed=TRUE; %u?>#  
    } <S\jpB  
   } I*%-cA%l  
  } k;2GEa]w  
  if(!bProcessed){ !_"@^?,q  
   for(int index=0;index<MAX_KEY;index++){ w&X<5'GM  
    if(hCallWnd[index]==NULL) xRJ\E }/7  
     continue; "&%I)e^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) dOa+(fMe  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); uya.sF0]9B  
   } ;l4[%xld  
  } #G .ulX  
 } 3%l*N&gsg:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ]@dZ{H|  
} ?b*s. ^  
RdWRWxTn8+  
BOOL InitHotkey() d^ Inb!%w  
{ u_hD}V^x4  
 if(hHook!=NULL){ b+,' ;bW  
  nHookCount++; Mxe}B'  
  return TRUE; 5G::wuxk  
 } S-P/+K6  
 else ,">]`|?  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 7_%"BVb"  
  if(hHook!=NULL) {`J)j6;  
   nHookCount++; Hv!U| L  
  return (hHook!=NULL); `lQ3C{}  
} $Oq^jUJ  
BOOL UnInit() 5)FJ:1-  
{ i;]"n;>+/  
 if(nHookCount>1){ {,3>"  
  nHookCount--; T3~k>"W  
  return TRUE; .}&` TU  
 } } uO);k5H  
 BOOL unhooked = UnhookWindowsHookEx(hHook); e7@ojOQ%  
 if(unhooked==TRUE){ 0vFD3}~>  
  nHookCount=0; Qi^Z11  
  hHook=NULL; 7"aN#;&  
 } 4\y/'`xm)6  
 return unhooked; 2w59^"<,  
} |s'Po^Sy  
&atuK*W>  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _  <WJ7  
{ 2#P* ,  
 BOOL bAdded=FALSE; 3wOZ4<B  
 for(int index=0;index<MAX_KEY;index++){ ?6yjy<D)$e  
  if(hCallWnd[index]==0){ z,Medw6[  
   hCallWnd[index]=hWnd; @Gk ILFN  
   HotKey[index]=cKey; ? K ;dp  
   HotKeyMask[index]=cMask; 4~y(`\0?4  
   bAdded=TRUE; tro7Di2Q  
   KeyCount++; ?h.wK  
   break; TX$r `~  
  } ^.KwcXr  
 } ?>hPO73{  
 return bAdded; ~kShq%  
} "*m_> IU  
uZM{BgXXD  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4NGA/ G  
{ L_vISy%\b  
 BOOL bRemoved=FALSE; U[SaY0Z  
 for(int index=0;index<MAX_KEY;index++){ I`p+Qt  
  if(hCallWnd[index]==hWnd){ C3eR)Yh  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Inn@2$m~  
    hCallWnd[index]=NULL; u6T+Cg  
    HotKey[index]=0; 18~>ZR  
    HotKeyMask[index]=0; (}a8"]Z  
    bRemoved=TRUE; TFH\K{DM  
    KeyCount--; mk1bcK9  
    break; DSC$i|  
   } : e]a$  
  } "7!;KHc  
 } 5Y.vJz  
 return bRemoved; V@Rrn <l  
} vtw6FX_B  
=G]1LTI  
void VerifyWindow() FB  _pw!z  
{ s8-<m,*  
 for(int i=0;i<MAX_KEY;i++){ y<HO:kZ8`  
  if(hCallWnd!=NULL){ >_e]C}QUr  
   if(!IsWindow(hCallWnd)){ K&nE_.kbl  
    hCallWnd=NULL; v 0 }@  
    HotKey=0; _jJPbKz  
    HotKeyMask=0; q;QbUO  
    KeyCount--; U@gn;@\  
   } )0ea+ ib  
  } (5#nrF]  
 } NPCs('cd>?  
} =+ytTQc*ot  
f47Od-\-  
BOOL CHookApp::InitInstance() |K6REkzr  
{ |<#{"'/=  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); mX\T D0$d  
 hins=AfxGetInstanceHandle(); n1~o1  
 InitHotkey(); xgpi-l  
 return CWinApp::InitInstance(); 9^,Lc1"M>  
} x97 j  
9;_sC  
int CHookApp::ExitInstance() 1nQWW9i  
{ \Kl+ 5%L  
 VerifyWindow(); %ZNI:Uh  
 UnInit(); XM1WfjE\  
 return CWinApp::ExitInstance(); Z3{>yYR+  
} 7B b9 t  
vV[eWd.o6M  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file lLp^Gt^}w(  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) q[HTnx  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ lL{ 5SH<Q  
#if _MSC_VER > 1000  86(I^=  
#pragma once I|>^1kr8w  
#endif // _MSC_VER > 1000 94+KdHAo^M  
wT `a3Ymm  
class CCaptureDlg : public CDialog GqWB{$J;"  
{ 2W/?q!t  
 // Construction \]=7!RQ\  
 public: kB/D!1 "  
  BOOL bTray; R($KSui  
  BOOL bRegistered; jqv-D  
  BOOL RegisterHotkey(); Tsgk/e9K2?  
  UCHAR cKey; b /@#}Gc  
  UCHAR cMask; *$p2*%7Ne  
  void DeleteIcon(); y$@ZN~8  
  void AddIcon(); "i U}]e0  
  UINT nCount; > ;L6xt3  
  void SaveBmp(); odPL {XFj  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor nyBJb(5"B  
  // Dialog Data c/zJv*}x ?  
  //{{AFX_DATA(CCaptureDlg) WpF2)R}G=  
  enum { IDD = IDD_CAPTURE_DIALOG }; pcYG~pZ9  
  CComboBox m_Key; IkBei&4F`  
  BOOL m_bControl; an|x$e7|?  
  BOOL m_bAlt; p8Q,@ql.  
  BOOL m_bShift; HR ;)|j{!  
  CString m_Path; aCQ?fq  
  CString m_Number; >c9a0A  
  //}}AFX_DATA nx8a$vI-TY  
  // ClassWizard generated virtual function overrides {.QEc0-  
  //{{AFX_VIRTUAL(CCaptureDlg) @$LWWTr;  
 public: .Jt[(;  
  virtual BOOL PreTranslateMessage(MSG* pMsg); $/.zm; D  
 protected: lD"(MQV@0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support uM_#  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); cJ1#ge%4  
  //}}AFX_VIRTUAL 31rx-D8o  
  // Implementation 3H|_mX  
 protected: u[ L`-zI  
  HICON m_hIcon; 2'_:S@  
  // Generated message map functions /RHo1  
  //{{AFX_MSG(CCaptureDlg) /[Z,MG  
  virtual BOOL OnInitDialog(); GG@ md_  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); s}jHl8  
  afx_msg void OnPaint(); F'B8v 3  
  afx_msg HCURSOR OnQueryDragIcon(); 6 G3\=)  
  virtual void OnCancel(); LM7$}#$R  
  afx_msg void OnAbout(); `FYv3w2  
  afx_msg void OnBrowse(); XVKfl3'%  
  afx_msg void OnChange(); 9T |IvQK8  
 //}}AFX_MSG RAG3o-  
 DECLARE_MESSAGE_MAP() qQ"Fv|]~>  
}; NR -!VJQ  
#endif y($%;l   
E}sO[wNPf  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file q)Fq i  
#include "stdafx.h" ?pn}s]*/  
#include "Capture.h" S zUpWy&  
#include "CaptureDlg.h" oo=Qt(#  
#include <windowsx.h> &4b&X0pU  
#pragma comment(lib,"hook.lib") /%&2HDA)  
#ifdef _DEBUG %n hm  
#define new DEBUG_NEW $)RNKMZC}A  
#undef THIS_FILE yto,>Utzg  
static char THIS_FILE[] = __FILE__; -C<zF`jO  
#endif (*oL+ef-C  
#define IDM_SHELL WM_USER+1 l-ct?T_@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &_"]5/"(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]`&Yqg  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; B x (uRj  
class CAboutDlg : public CDialog H63,bNS s  
{ _T2=J+"-Kp  
 public: )('%R|$ /  
  CAboutDlg(); Gm(b/qDDe  
  // Dialog Data 0&/b42W  
  //{{AFX_DATA(CAboutDlg) ;PjQt=4K  
  enum { IDD = IDD_ABOUTBOX }; &2`Fn!m  
  //}}AFX_DATA sFQ^2PwbS  
  // ClassWizard generated virtual function overrides #|*F1K  
  //{{AFX_VIRTUAL(CAboutDlg) Q($Z%1S  
 protected: )hk   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support DwrO JIy  
  //}}AFX_VIRTUAL Y=?yhAw  
  // Implementation hi0R.V&  
 protected: ,4ei2`wV  
  //{{AFX_MSG(CAboutDlg) xf b]b2  
  //}}AFX_MSG 4dhvFGlW  
  DECLARE_MESSAGE_MAP() `67[O4$<  
}; 6IWxPt ~  
{%IExPJ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) e_/b2"{  
{ j{NNSi3  
 //{{AFX_DATA_INIT(CAboutDlg) /Wy.>YC|  
 //}}AFX_DATA_INIT 'Er:a?88l  
} ]R=,5kK3  
#{=;NuP  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) x-?{E  
{ CMn{LQcC  
 CDialog::DoDataExchange(pDX); ]|sAK%/  
 //{{AFX_DATA_MAP(CAboutDlg) >2< 8kBF_  
 //}}AFX_DATA_MAP `&-Mi[1  
} 4"xPr[=iG  
CT1ja.\;  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) CE"JS-S?  
 //{{AFX_MSG_MAP(CAboutDlg) vq!_^F<  
 // No message handlers =E&OuX-R  
 //}}AFX_MSG_MAP nkv(~ej(  
END_MESSAGE_MAP() zFQ&5@43  
I2 a6w<b  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) )XfzLF7  
: CDialog(CCaptureDlg::IDD, pParent) |e a~'N1  
{ nr)c!8  
 //{{AFX_DATA_INIT(CCaptureDlg) KI]wm  
  m_bControl = FALSE; vfB2XVc  
  m_bAlt = FALSE; X1tXqHJF}  
  m_bShift = FALSE; 5/QRL\  
  m_Path = _T("c:\\"); @h?shW=^  
  m_Number = _T("0 picture captured."); i-U4RZE  
  nCount=0; fZKt%m  
  bRegistered=FALSE; 4Iq'/r  
  bTray=FALSE; +Ug/rtK4   
 //}}AFX_DATA_INIT .P$IJUYO  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 L&-hXGx=7  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^+SkCO  
} 3K@@D B6  
J!ntXF  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) mfny4R1_  
{ I =Wc&1g  
 CDialog::DoDataExchange(pDX); <P%}|@  
 //{{AFX_DATA_MAP(CCaptureDlg) Q{QYBh&  
  DDX_Control(pDX, IDC_KEY, m_Key); }]UB;id'  
  DDX_Check(pDX, IDC_CONTROL, m_bControl);  qW_u  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ^")F7`PF  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); JIO$=+p  
  DDX_Text(pDX, IDC_PATH, m_Path); 7:NmCpgL!  
  DDX_Text(pDX, IDC_NUMBER, m_Number); wzjU,Mw e  
 //}}AFX_DATA_MAP JM.XH7k  
}  \4ghYQ:  
uqyB5V0gh  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ;oH ,~|K  
//{{AFX_MSG_MAP(CCaptureDlg) i;PL\Er:tX  
 ON_WM_SYSCOMMAND() rAdacnZV  
 ON_WM_PAINT() ,}D}oo*  
 ON_WM_QUERYDRAGICON() %ICglF R  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 7@%'wy&A  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) H/~?@CE(YC  
 ON_BN_CLICKED(ID_CHANGE, OnChange) M~6@20$oW  
//}}AFX_MSG_MAP *B)yy[8j+  
END_MESSAGE_MAP() Lp:6 ;  
d6 _C"r  
BOOL CCaptureDlg::OnInitDialog() (3,.3)%`  
{ O';ew)tI  
 CDialog::OnInitDialog(); Ek.&Sf$cd'  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); MN= sIP,zk  
 ASSERT(IDM_ABOUTBOX < 0xF000); }b["Jk\2  
 CMenu* pSysMenu = GetSystemMenu(FALSE); HO|-@yOF^  
 if (pSysMenu != NULL) cm>E[SHr  
 { -[#n+`M  
  CString strAboutMenu; ://U^sFL  
  strAboutMenu.LoadString(IDS_ABOUTBOX); @fn6<3  
  if (!strAboutMenu.IsEmpty()) U!q[e`B  
  { |@VF.)_  
   pSysMenu->AppendMenu(MF_SEPARATOR); =)<3pGO  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); &b C}3D  
  } XbvDi+R 2A  
 } ;\)=f6N  
 SetIcon(m_hIcon, TRUE); // Set big icon )xl6,bq3  
 SetIcon(m_hIcon, FALSE); // Set small icon yDd[e]zS`  
 m_Key.SetCurSel(0); _ptP[SV^j  
 RegisterHotkey(); .5tg4%l  
 CMenu* pMenu=GetSystemMenu(FALSE); j^u[F"  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); +QqH}= M  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); (7q^FtjA#  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 7t(Y;4<2  
 return TRUE; // return TRUE unless you set the focus to a control 7|D|4!i2Y  
} x(r+P9f\<  
9k2,3It  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) hFb fNB3  
{ jqoPLbxT  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 4Z%Y"PL(K  
 { .;Y x*]  
  CAboutDlg dlgAbout; j]> uZalr  
  dlgAbout.DoModal(); t3F?>G#y  
 } 6&!l'[hU  
 else /mbCP>bcG  
 { %O) Z  
  CDialog::OnSysCommand(nID, lParam); _-a|VTM  
 } QPg2Y<2  
} U~QMR-bz  
23E 0~O  
void CCaptureDlg::OnPaint() 5d 5t9+t  
{ =:5<{J OG  
 if (IsIconic()) Ggd lVi 2  
 { 1Ii| {vR  
  CPaintDC dc(this); // device context for painting ph^4GBR   
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); =P_fv  
  // Center icon in client rectangle zO2{.4  
  int cxIcon = GetSystemMetrics(SM_CXICON); G1_Nd2w  
  int cyIcon = GetSystemMetrics(SM_CYICON); I6w/0,azC  
  CRect rect; 1i,4".h?M  
  GetClientRect(&rect); dq 8+m(7k  
  int x = (rect.Width() - cxIcon + 1) / 2; ~/c5 hyTx  
  int y = (rect.Height() - cyIcon + 1) / 2; ~zMKVM1Q.,  
  // Draw the icon (|0b7 |'T  
  dc.DrawIcon(x, y, m_hIcon); r@$B'CsLj  
 } 6&],WGz  
 else 9s $PrF  
 { *)%dXVf  
  CDialog::OnPaint(); i_Ar<9a~  
 } ?M"HXu  
} ZlM_ m >,o  
(v;A'BjN  
HCURSOR CCaptureDlg::OnQueryDragIcon() 6lU|mJ`M  
{ FE6C6dW{  
 return (HCURSOR) m_hIcon; 5'9.np F)  
} ?'+8[OHiF^  
FW^.m?}|  
void CCaptureDlg::OnCancel() n0FYfqH  
{  ^@q#$/z  
 if(bTray) h6FgS9H  
  DeleteIcon(); :@e\'~7sH  
  CDialog::OnCancel(); %c0z)R~  
} 2?1}ZXr  
22I Yrk  
void CCaptureDlg::OnAbout() %MNk4UsV  
{  ~^7  
 CAboutDlg dlg; j];G*-iv{  
 dlg.DoModal(); }bgo )<i  
} yM17H\=  
>nNl^ yqW  
void CCaptureDlg::OnBrowse() x vJ^@w'  
{ 5 ZUy:  
 CString str; 6 5"uD7;  
 BROWSEINFO bi; R\ q):,  
 char name[MAX_PATH]; \)GR\~z0h  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); @YNGxg~*g  
 bi.hwndOwner=GetSafeHwnd(); #fzw WP  
 bi.pszDisplayName=name; C,='3^Nc  
 bi.lpszTitle="Select folder"; ReqE?CeV  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 8q*";>*  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ]W|RtdF3.N  
 if(idl==NULL) pg5&=  
  return; !3?~#e{_  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); #-dK0<:  
 str.ReleaseBuffer(); TRCI\  
 m_Path=str; @:IL/o*  
 if(str.GetAt(str.GetLength()-1)!='\\') #rq?f  
  m_Path+="\\"; Bpas[2gYC  
 UpdateData(FALSE); +yIL[D  
} @|]G0&gn&?  
l}+Cdy9>  
void CCaptureDlg::SaveBmp() 5])8qb/F  
{ @dl<-  
 CDC dc; mCG;[4gM  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); tKX}Ok:V%  
 CBitmap bm; )?9\$^I  
 int Width=GetSystemMetrics(SM_CXSCREEN); U>1b9G"_  
 int Height=GetSystemMetrics(SM_CYSCREEN); (6o:4|xl0  
 bm.CreateCompatibleBitmap(&dc,Width,Height); i)8gCDc  
 CDC tdc; A{t"M-<  
 tdc.CreateCompatibleDC(&dc); Fi/jR0]e2  
 CBitmap*pOld=tdc.SelectObject(&bm); [{/$9k-aF?  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ?0m?7{  
 tdc.SelectObject(pOld); u<C $'V  
 BITMAP btm; TL]bY'%  
 bm.GetBitmap(&btm); AW62~*  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; "p`o]$Wv  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); `+Xe'ey  
 BITMAPINFOHEADER bih; c-|kv[\a  
 bih.biBitCount=btm.bmBitsPixel; uYY=~o[ Tw  
 bih.biClrImportant=0; M(NH9EE  
 bih.biClrUsed=0; +yiU@K).0  
 bih.biCompression=0; [}@n*D$  
 bih.biHeight=btm.bmHeight; }*Dd/'2+1  
 bih.biPlanes=1; c0SX]4} G  
 bih.biSize=sizeof(BITMAPINFOHEADER); n'Bmz  
 bih.biSizeImage=size; +L n M\n  
 bih.biWidth=btm.bmWidth; m.Twgin  
 bih.biXPelsPerMeter=0; WySNL#>a  
 bih.biYPelsPerMeter=0; 4xpj<  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); h9U+ %=^O  
 static int filecount=0; H[Cj7{V  
 CString name; 3 ^pYC K%  
 name.Format("pict%04d.bmp",filecount++); :K: f^o]s  
 name=m_Path+name; HmFNE$k  
 BITMAPFILEHEADER bfh; l-Fmn/V  
 bfh.bfReserved1=bfh.bfReserved2=0; m_(E(_  
 bfh.bfType=((WORD)('M'<< 8)|'B'); M;V&KG Z  
 bfh.bfSize=54+size; #Af)n(  
 bfh.bfOffBits=54; h^`{ .TlN  
 CFile bf; s5nB(L*Pjp  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 8KZ$ F>T]>  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Pb3EnNqYbM  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); .$UTH@;7  
  bf.WriteHuge(lpData,size); @{'o#EJY  
  bf.Close(); x}_rnf_  
  nCount++; .:T9pplq  
 } \?r$&K]4  
 GlobalFreePtr(lpData); a4:`2  
 if(nCount==1) &bn*p.=G  
  m_Number.Format("%d picture captured.",nCount); QaIi.* tic  
 else M&eQ=vew.  
  m_Number.Format("%d pictures captured.",nCount); *1i?6$[ "  
  UpdateData(FALSE); +J%6bn)U  
} W3"vTZJF  
k"0%' Y  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]}_p3W "Y9  
{ w<btv]X1  
 if(pMsg -> message == WM_KEYDOWN) gZ1N&/9;  
 { %bEGv:88s  
  if(pMsg -> wParam == VK_ESCAPE) i_|h{JK)  
   return TRUE; *m iONc  
  if(pMsg -> wParam == VK_RETURN) *h>OW  
   return TRUE; N&x@_t""   
 } 5 Xk~,%-C  
 return CDialog::PreTranslateMessage(pMsg); #j\*Lc"Ur:  
} Z4=_k{*  
N'I?fWN!;R  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) P Q6T| >  
{ r$94J'_  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ }{P&idkv  
  SaveBmp(); _F! :(@}  
  return FALSE; #W_i{bdO  
} }<E sS  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [5x+aW%ql  
 CMenu pop; ="/R5fp  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); P0a>+^:%  
 CMenu*pMenu=pop.GetSubMenu(0); "r:H5) !  
 pMenu->SetDefaultItem(ID_EXITICON); B8`R(vu;  
 CPoint pt; -Mr{+pf  
 GetCursorPos(&pt); -$xKv4  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); D WsCYo  
 if(id==ID_EXITICON) GH [ U!J  
  DeleteIcon(); U&w*Sb"  
 else if(id==ID_EXIT) c`rfKr&z  
  OnCancel(); niXHK$@5  
 return FALSE; }]uB? +c  
} L~'^W/N  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0 =3FO}[u  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) T^rz!k{  
 AddIcon(); ['Hp?Q|k  
 return res; Ej-=y2j{g  
} ;JMOsn}8  
/%2:+w  
void CCaptureDlg::AddIcon() \Sz4Gr0g3Z  
{ V 22q*/iV  
 NOTIFYICONDATA data; Uh<H*o6e 9  
 data.cbSize=sizeof(NOTIFYICONDATA); d w|-=~  
 CString tip; DMy4"2 o  
 tip.LoadString(IDS_ICONTIP); .%-6&%1  
 data.hIcon=GetIcon(0); 8:;u v7p  
 data.hWnd=GetSafeHwnd(); 3(oZZz  
 strcpy(data.szTip,tip); X; e`y:9  
 data.uCallbackMessage=IDM_SHELL; -`<6=[QUO  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; pZni,< Q  
 data.uID=98; }Bv30V2-(  
 Shell_NotifyIcon(NIM_ADD,&data); 6)tB{:h&~0  
 ShowWindow(SW_HIDE); Requ.?!fG;  
 bTray=TRUE; Om&{4a\  
} oyi7YRvwd  
hlABu)B'1  
void CCaptureDlg::DeleteIcon() \i&vOH'  
{ -oaG|  
 NOTIFYICONDATA data; s!nSE  
 data.cbSize=sizeof(NOTIFYICONDATA); 6KBzlj0T+  
 data.hWnd=GetSafeHwnd(); yg-L^`t+B5  
 data.uID=98; Z7m GC`>  
 Shell_NotifyIcon(NIM_DELETE,&data); RE(=! 8lGR  
 ShowWindow(SW_SHOW); s$2l"|h>B  
 SetForegroundWindow(); ai<MsQQ:=  
 ShowWindow(SW_SHOWNORMAL); "4Wp>B  
 bTray=FALSE; 4EaS g#  
} [qjAq@@N#q  
U_ N5~#9   
void CCaptureDlg::OnChange() 5kRwSOG%'  
{ YokZar2a0  
 RegisterHotkey(); H L}sqcp  
} VDb,$i.Z0  
)Yy#`t  
BOOL CCaptureDlg::RegisterHotkey() buxI-wv  
{ ^R8U-V8:  
 UpdateData(); {{4p{  
 UCHAR mask=0; D~i@. k  
 UCHAR key=0; } K hq  
 if(m_bControl) |4?}W ,  
  mask|=4; 67K RM(S  
 if(m_bAlt) yjM@/b  
  mask|=2; cA (e "N  
 if(m_bShift) 95gsv\2  
  mask|=1; "Wn?8vR  
  key=Key_Table[m_Key.GetCurSel()]; C&CsI] @g  
 if(bRegistered){ bN7UO  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); %t5BB$y  
  bRegistered=FALSE; 8y 4D9_{  
 } +~i+k~{`H  
 cMask=mask; 9,EaN{GM  
 cKey=key; l_j<aCY?|  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); SJ WP8+  
 return bRegistered; k,*#I<($  
} [K4+G]6  
wMPw/a;  
  四、小结 2dd:5L,  
k vgs $  
  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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