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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: kE+fdr\ T  
  .;U?%t_7  
  一、实现方法 ^?q(fK%  
9J_vvq`%`  
  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: ?J+*i d  
Zu~t )W  
#pragma data_seg("shareddata") 2h}FotlO  
HHOOK hHook =NULL; //钩子句柄 "-5FUKI-  
UINT nHookCount =0; //挂接的程序数目 qauvwAMuX  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 lA6{TH.x  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 .W9 *-  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey P uQ  
static int KeyCount =0; U5F1m]gFr  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 bz,"TG[  
#pragma data_seg() =_6 Q26  
yk^2<?z>2  
  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。 #K`[XA  
JvCy&xrE;  
  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: %Zfh6Bl\X  
3fE0cVG*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR :.{d,)G  
cKey,UCHAR cMask) @.dM1DN)  
{ }lq$Fi/  
 BOOL bAdded=FALSE; ojJu a c4  
 for(int index=0;index<MAX_KEY;index++){ +,T}x+D  
  if(hCallWnd[index]==0){ 31]Vo;D  
   hCallWnd[index]=hWnd; P $r!u%W  
   HotKey[index]=cKey; J!Rqm!)q  
   HotKeyMask[index]=cMask; +,i_G?eX  
   bAdded=TRUE; QD-Bt=S7l  
   KeyCount++; { q&`B  
   break; 6aAN8wO;b  
  } $fPiR  
 } 3EA_-?  
 return bAdded; Oz xiT +  
} Un+-  T  
//删除热键 zQGj,EAM}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) qM>Dt  
{ W3X;c*j  
 BOOL bRemoved=FALSE; @P=n{-pIW  
 for(int index=0;index<MAX_KEY;index++){ 6@d/k.3p  
  if(hCallWnd[index]==hWnd){ 96gaun J  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ xo-{N[r  
    hCallWnd[index]=NULL; @te}Asv  
    HotKey[index]=0; jC-`u-_'j  
    HotKeyMask[index]=0; i!<(R$ Lo  
    bRemoved=TRUE; 11!4#z6w  
    KeyCount--; a6d|Ps.\!  
    break; f?@M"p@T  
   } K|;L{[[yH  
  } <BdC#t:*L  
 } Idj Z2)$  
 return bRemoved; OaByfo<S  
} mndEB!b  
,yfJjV*I  
JmBMc }54  
  DLL中的钩子函数如下: xKT;1(Mk  
ILHn~d IC  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) g,Rh Ut9  
{ ;>]dwsA*P  
 BOOL bProcessed=FALSE; ((BdT:T\_  
 if(HC_ACTION==nCode) pC&i!la{o}  
 { 09iD| $~  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ,M\/[_:  
   switch(wParam) dVJ9cJ9^  
   {  Lk)TK/JM)  
    case VK_MENU: +xr;X 9  
     MaskBits&=~ALTBIT; 1aUu:#c  
     break; #yCnM]cEn  
    case VK_CONTROL: a^&RV5o  
     MaskBits&=~CTRLBIT; LsK fCB}  
     break; |c2;`T#`o  
    case VK_SHIFT: "nNT9 K|  
     MaskBits&=~SHIFTBIT; "x3!F&  
     break; ?J"Y4,{  
    default: //judge the key and send message g(F2IpUm/  
     break; 1-G-p:|  
   } uBaGOW|Pl  
   for(int index=0;index<MAX_KEY;index++){ D]V&1n  
    if(hCallWnd[index]==NULL) #hEU)G' $+  
     continue; En8L1$_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) JgldC[|7  
    { X(>aW*q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); D6P/39}W  
     bProcessed=TRUE; Z~"8C Kz  
    } 7z8   
   } 7#g<fh  
  } od3b,Q  
  else if((lParam&0xc000ffff)==1){ //有键按下 pTYV@5|  
   switch(wParam) Q0""wR q'  
   { 2bpFQ8q  
    case VK_MENU: 7. eiM!7g  
     MaskBits|=ALTBIT; b]WvKdq  
     break; r+MqjdXG  
    case VK_CONTROL: kChCo0Q>1  
     MaskBits|=CTRLBIT; uD`Z\@Z  
     break; =?hbi]  
    case VK_SHIFT: H|cxy?iJ  
     MaskBits|=SHIFTBIT; 1a#R7chl  
     break; mldY/;-H!1  
    default: //judge the key and send message (`f)Tt=`  
     break; ( "J_< p  
   } \=@4F^U7`  
   for(int index=0;index<MAX_KEY;index++){ W jBtL52  
    if(hCallWnd[index]==NULL) cdfnM%`>\  
     continue; SsIN@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zOL*XZ0c  
    { VmTgD96  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ^cojETOv  
     bProcessed=TRUE; M[&p[P@  
    } 2AjP2  
   } Nbm$ta  
  } PE+{<[n  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 U9//m=_  
   for(int index=0;index<MAX_KEY;index++){ leJ3-w{ 2  
    if(hCallWnd[index]==NULL) /<IXCM.  
     continue; jTok1k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) l @r`NFWD@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); RgVg~?A@  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 '/F~vSQsR  
   } #Xun>0  
  } !p 70g0+  
 } xb^M33-y  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); }ev+WIERQV  
} 6IL-S%EGK1  
Q".p5(<  
  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: lp]q%P  
dcN4N5r  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); pR~"p#Y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2ZQ|nwb7  
%VgK::)r  
  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: d#HN '(2t  
; 5!8LmZ0#  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;:ocU?  
{ $/P\@|MqYQ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) NJ!}(=1|K  
 { D+Z,;XZ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 vP/sG5$x  
  SaveBmp(); ;DI"9  
  return FALSE; g_MxG!+(V  
 } wafws*b%  
 …… //其它处理及默认处理 `>{S?t<  
} yTU'voE.|  
wW'.bqA  
-.7UpDg~  
  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。 [N*`3UZk"  
~fly6j|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。 ltmD=-]G_  
q62U+o9G  
  二、编程步骤 ]+AgXUrbOD  
4{ exv  
  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"; @S  Quc  
Y/34~lhyl  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; } 71 9_DF  
<h1J+  
  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; 2rX}A3%9^^  
/d1V&Lj  
  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; _." X# }W  
'J#uD|9)  
  5、 添加代码,编译运行程序。 |>=\ VX17  
_zFJ]7Ym.)  
三、程序代码 FGRG?d4?h  
5~SBZYI  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL %967#XI[y  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Kr;F4G|Qt  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ aW$))J)0  
#if _MSC_VER > 1000 )mRKIM}*W  
#pragma once Bd*\|M  
#endif // _MSC_VER > 1000 Fk&A2C}$b  
#ifndef __AFXWIN_H__ hUMFfc ?  
#error include 'stdafx.h' before including this file for PCH [$%0[;jtS  
#endif DBzF\-  
#include "resource.h" // main symbols ZZF\;  
class CHookApp : public CWinApp 0Ewt >~n  
{ ;i;;{j@$i  
 public: |#(g 8ua7  
  CHookApp(); ZUeA&&{  
  // Overrides y O?52YO  
  // ClassWizard generated virtual function overrides Zq"wq[GCN  
  //{{AFX_VIRTUAL(CHookApp) bR|1* <  
 public: <fcw:Ae  
  virtual BOOL InitInstance(); xT3l>9i  
  virtual int ExitInstance(); Dlu]4n[LB  
  //}}AFX_VIRTUAL 7#iT33(3  
  //{{AFX_MSG(CHookApp) C)qP9uW  
  // NOTE - the ClassWizard will add and remove member functions here. ,DWC=:@X  
  // DO NOT EDIT what you see in these blocks of generated code ! |:d:uj/  
  //}}AFX_MSG mi{ r7.e5I  
  DECLARE_MESSAGE_MAP() jh.e&6  
}; 1"HSM =p  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); sh8(+hg  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7)v`l1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); q e;O Ox  
BOOL InitHotkey(); vpqMKyy  
BOOL UnInit(); %c,CfhEV%&  
#endif 55|.MXzq  
7!E7XP6,~>  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. >{kPa|  
#include "stdafx.h" H3" D$Nv  
#include "hook.h" s$;IR c5!6  
#include <windowsx.h> "]{"4qV1=  
#ifdef _DEBUG 8\ WOss)al  
#define new DEBUG_NEW cK+y3`.0  
#undef THIS_FILE r=pb7=M#LN  
static char THIS_FILE[] = __FILE__; vE+OL8V  
#endif "J6 aU  
#define MAX_KEY 100 834dsl+U  
#define CTRLBIT 0x04 {uMqd-Uu  
#define ALTBIT 0x02 FUU/=)^P$  
#define SHIFTBIT 0x01 J*CfG;Y:  
#pragma data_seg("shareddata") 5mYI5~ p  
HHOOK hHook =NULL; I`}<1~ue  
UINT nHookCount =0; Qz?r4kR  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ='|HUxFi  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT HxH=~B1"P  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey s_N]$3'[E  
static int KeyCount =0; T~'9p`IW  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift vdN0YCXG  
#pragma data_seg() 66~]7w  
HINSTANCE hins; hFWK^]~ a  
void VerifyWindow(); Lg4I6 G  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ym)`<[T  
//{{AFX_MSG_MAP(CHookApp) Z ]WA-Q6n  
// NOTE - the ClassWizard will add and remove mapping macros here. 9ApGn!`  
// DO NOT EDIT what you see in these blocks of generated code! 8q& *tpE  
//}}AFX_MSG_MAP C]+T5W\"<B  
END_MESSAGE_MAP() yD9<-B<)  
ZIrJ"*QO=  
CHookApp::CHookApp() A?sU[b6_  
{ PNMf5'@m  
 // TODO: add construction code here, n/]$k4h  
 // Place all significant initialization in InitInstance Yl6\}_h`  
} ~_Mz05J-\_  
)z#M_[zC>  
CHookApp theApp; ]w=6.LzO*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) juuV3et  
{ lhA<wV1-9G  
 BOOL bProcessed=FALSE; zx{O/v KG  
 if(HC_ACTION==nCode) r'ydjy  
 { pJ1Q~tI  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8QGj:3  
   switch(wParam) |.Pl[y  
   { A{Q:,S)  
    case VK_MENU: +t XOP|X  
     MaskBits&=~ALTBIT; ihJC)m`Hbl  
     break; y 3O Nn~k  
    case VK_CONTROL: #dgWXO  
     MaskBits&=~CTRLBIT; [oQ&}3\XJ  
     break; j\SW~}d9  
    case VK_SHIFT: cAE.I$T(  
     MaskBits&=~SHIFTBIT; yxa~R z/  
     break; 3y Azt*dZ  
    default: //judge the key and send message vYNh0)$%F  
     break; }3Y3f).ZW  
   } ?=uw0~O[  
   for(int index=0;index<MAX_KEY;index++){ b]h]h1~hHH  
    if(hCallWnd[index]==NULL) 5Y8/ZW~D0  
     continue; R]Q4+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5PQs1B  
    { uvrfR?%QK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1=t\|Th-  
     bProcessed=TRUE; emV@kN.  
    } 9)qjW&`  
   } '?~k`zK  
  } ?DC3BA\)  
  else if((lParam&0xc000ffff)==1){ //Key down a,U =irBA  
   switch(wParam) %8V/QimHU  
   { 1+^L,-k!  
    case VK_MENU: Xx0}KJ q~"  
     MaskBits|=ALTBIT; WM}bM] oe  
     break; k'BLos1W  
    case VK_CONTROL: TvWhy`RQ  
     MaskBits|=CTRLBIT; ;mLbJT   
     break; ),-4\!7  
    case VK_SHIFT: 6 tbH(  
     MaskBits|=SHIFTBIT; nV0"q|0K;  
     break; {Z_Pry$6  
    default: //judge the key and send message I/s?] v  
     break; 1& k_&o  
   } 3a4 ]{  
   for(int index=0;index<MAX_KEY;index++) 8F<Qc*'  
   { %L./U$  
    if(hCallWnd[index]==NULL) ?~a M<rcZ  
     continue; N+?kFob  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N3nk\)V\E  
    { 1b'1vp  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); WQ]~TGW  
     bProcessed=TRUE; ,diV;d  
    } e6f!6a+%  
   } BV&}(9z  
  } !o 7uZC\  
  if(!bProcessed){ `oh'rm3'8  
   for(int index=0;index<MAX_KEY;index++){ -NVk>ENL4  
    if(hCallWnd[index]==NULL) zy#E qv  
     continue; gT R:9E:B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) NDRk%_Eu(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); L$`!~z 1  
   } A]{8 =  
  } &Sc}3UI/F  
 } MWCP/~>a2  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); C<6IiF[>%  
} 3Nh;^  
VYhZ0;' '  
BOOL InitHotkey() {nbD5 ?   
{ E YUr.#:  
 if(hHook!=NULL){ ,7pO-:*g  
  nHookCount++; 1GW=QbO 6  
  return TRUE; '8>#`Yba  
 } T"Wq:  
 else )*^PMf  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 4kA/W0 VG  
  if(hHook!=NULL) h"YIAQ',  
   nHookCount++; d*1@lmV*  
  return (hHook!=NULL); ZBJYpeGe  
} b=QO^  
BOOL UnInit() odquAqn  
{ ;sa-Bh=j^  
 if(nHookCount>1){ 1H @GwQ|<=  
  nHookCount--; 5jg^12EP  
  return TRUE; EPr{1Z  
 } U$pHfNTH  
 BOOL unhooked = UnhookWindowsHookEx(hHook); awXL}m[_!  
 if(unhooked==TRUE){ {P(Z{9u%  
  nHookCount=0; -?!Z/#i4  
  hHook=NULL; /+J?Ep(_  
 } F#iLMO&Q  
 return unhooked; b9OT~i=S|  
} @yB!?x  
g B<p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tGD$cBE  
{ ;'pEzz?k"  
 BOOL bAdded=FALSE; g?i_10Xlp  
 for(int index=0;index<MAX_KEY;index++){ `a2Oj@jP  
  if(hCallWnd[index]==0){ C>@~W(IE  
   hCallWnd[index]=hWnd; g=[ F W@z  
   HotKey[index]=cKey; qrNW\ME  
   HotKeyMask[index]=cMask; (^9q7)n  
   bAdded=TRUE; ^#S  
   KeyCount++; }x-~>$:"  
   break; [8SW0wsk  
  } cCU'~  
 } "^<:7_Y  
 return bAdded; lV$U!v: b  
} T |'Ur #  
vUgLWd  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {TdK S  
{ 6yTL7@V|B  
 BOOL bRemoved=FALSE; tZU"Ud  
 for(int index=0;index<MAX_KEY;index++){ A@_F ;4X  
  if(hCallWnd[index]==hWnd){ _e8@y{/~Fd  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?Yg K]IxD  
    hCallWnd[index]=NULL; 4\2p8__  
    HotKey[index]=0; \Ul*Nsw  
    HotKeyMask[index]=0; akBR"y:~:H  
    bRemoved=TRUE; rEdr8qw  
    KeyCount--; Cz?N[dhh  
    break; 60teD>Eh,  
   } kzns:-a  
  } ss,t[`AV{  
 } w_,.  
 return bRemoved; uiE9#G  
} \p@,+ -gX  
ahS*YeS7  
void VerifyWindow() }PyAmh$@  
{ >}O1lsjW:z  
 for(int i=0;i<MAX_KEY;i++){ X'jEI{1w  
  if(hCallWnd!=NULL){ 0V}vVAa(B  
   if(!IsWindow(hCallWnd)){ m2{z  
    hCallWnd=NULL; tJ.LPgfZ  
    HotKey=0; / vje='[!  
    HotKeyMask=0;  O\]CfzR  
    KeyCount--; lbT<HWzNH  
   } 0'BR Sa<  
  } ,`/!0Wmt  
 } ui G7  
} Fdu0?H2TL  
J%f5NSSU{6  
BOOL CHookApp::InitInstance() _ZzPy;[i?  
{ dm.?-u;C  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Ej'a G   
 hins=AfxGetInstanceHandle(); 1oj7R7  
 InitHotkey(); WU#bA|Cf  
 return CWinApp::InitInstance(); !&E>8h  
} cKF02?)TX  
lUCdnp;w'  
int CHookApp::ExitInstance() Wz:MPdz3(  
{ k%NY,(:(  
 VerifyWindow(); -hp,O?PM  
 UnInit(); 8,dCx}X  
 return CWinApp::ExitInstance(); fBD5K3  
} yql+N[  
og. dYs7W4  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Zf]d'oW{/  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) TDtk'=;  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ / )5B  
#if _MSC_VER > 1000 >0@X^o  
#pragma once "H%TOk7l  
#endif // _MSC_VER > 1000 CL9p/PJ%e  
evg i\"  
class CCaptureDlg : public CDialog z~o%U&DO}  
{ AZl|; y  
 // Construction %Dsa ~{  
 public: c4L5"_#`x-  
  BOOL bTray; X"iy.@7  
  BOOL bRegistered; X-oou'4<  
  BOOL RegisterHotkey(); 3{d1Jk/S  
  UCHAR cKey; RXl52#:  
  UCHAR cMask; X@af[J[cQ  
  void DeleteIcon(); $3Wl~ G}  
  void AddIcon(); a/L?R Uu  
  UINT nCount; ?@_3B]Fs  
  void SaveBmp(); 39"8Nq|e  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor \+Qx}bS{  
  // Dialog Data j*W]^uT,  
  //{{AFX_DATA(CCaptureDlg) 5>}L3r>a;  
  enum { IDD = IDD_CAPTURE_DIALOG }; {x2N~1!E  
  CComboBox m_Key; [_-CO }>  
  BOOL m_bControl; vj?9X5A_  
  BOOL m_bAlt; HEjV7g0E  
  BOOL m_bShift; D\j1`  
  CString m_Path; -U%wLkf|  
  CString m_Number; G:u[Lk#6K  
  //}}AFX_DATA /d'^ XYOC  
  // ClassWizard generated virtual function overrides ,W*<e-  
  //{{AFX_VIRTUAL(CCaptureDlg) ,589/xTA@  
 public: z56W5g2  
  virtual BOOL PreTranslateMessage(MSG* pMsg); *tz"T-6O  
 protected: 'OBA nE<.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support K{M_ 4'\  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); @] )a  
  //}}AFX_VIRTUAL "-v9V7KCM  
  // Implementation g"# R>&P  
 protected: )F4er '  
  HICON m_hIcon; .t"s>jq 1  
  // Generated message map functions 'cH),~ z  
  //{{AFX_MSG(CCaptureDlg) vx!nC}f"k`  
  virtual BOOL OnInitDialog(); &z1r$X.AW  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !c(B^E  
  afx_msg void OnPaint(); BR5$;-7W  
  afx_msg HCURSOR OnQueryDragIcon(); wg!  
  virtual void OnCancel(); ;EL!TzL:8  
  afx_msg void OnAbout(); rU.ew~  
  afx_msg void OnBrowse(); zFB$^)v"<  
  afx_msg void OnChange(); ' 'UiQ   
 //}}AFX_MSG 1__p1  
 DECLARE_MESSAGE_MAP() R8o9$&4_  
}; En5I  
#endif bB)EJCPq>  
g[H7.  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ;\Wg>sq  
#include "stdafx.h" ]7dm`XV  
#include "Capture.h" {r'#(\  
#include "CaptureDlg.h" /wCP(1Mw  
#include <windowsx.h> nfrC@Av  
#pragma comment(lib,"hook.lib") C@]Z&H;  
#ifdef _DEBUG 1|z>} xP  
#define new DEBUG_NEW ut-UTW  
#undef THIS_FILE gyI5;il~  
static char THIS_FILE[] = __FILE__; %@H;6   
#endif 4^AE;= Q  
#define IDM_SHELL WM_USER+1 "=yaeEp  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v,+2CVdW  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2&$A x  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; qMI%=@=  
class CAboutDlg : public CDialog J# :%| F%  
{ x:sTE u@  
 public: Bj%{PK  
  CAboutDlg(); w? !@fu  
  // Dialog Data *QjFrw3  
  //{{AFX_DATA(CAboutDlg) E@ t~juF!  
  enum { IDD = IDD_ABOUTBOX }; O^U{I?gQ  
  //}}AFX_DATA <bGSr23*  
  // ClassWizard generated virtual function overrides ~(I\O?k>H  
  //{{AFX_VIRTUAL(CAboutDlg) BszkQ>#6  
 protected: 3TtnLay.k  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support H~||]_q|  
  //}}AFX_VIRTUAL [0MVsc=  
  // Implementation *QAK9mc  
 protected: $qIMYX  
  //{{AFX_MSG(CAboutDlg) evimnV  
  //}}AFX_MSG mKxQ U0`  
  DECLARE_MESSAGE_MAP() 17<\Q(YQ=  
}; }4eSB  
+sgishqn9  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) lg1?g)lv  
{ F5+f?B~?R?  
 //{{AFX_DATA_INIT(CAboutDlg) n6L}#aZG  
 //}}AFX_DATA_INIT SwSBQq%h]M  
} h7*fjw-Xz[  
:j?Lil%R  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) HlI*an  
{ c1MALgK~}\  
 CDialog::DoDataExchange(pDX); RE *UIh*O  
 //{{AFX_DATA_MAP(CAboutDlg) 9O@ eJ$  
 //}}AFX_DATA_MAP O]^E%;(]}i  
} (zgXhx_!D  
9.1%T06$  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) fS!%qr  
 //{{AFX_MSG_MAP(CAboutDlg) #\t?`\L3  
 // No message handlers RUO,tB|(_;  
 //}}AFX_MSG_MAP 6I_W4`<VeZ  
END_MESSAGE_MAP() dk{yx(Ty  
->K*r\T  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) `;QpPSw+  
: CDialog(CCaptureDlg::IDD, pParent) |3"'>* J  
{ BhdJ/C^  
 //{{AFX_DATA_INIT(CCaptureDlg) FeSe^^dW  
  m_bControl = FALSE; a8Ci 7<V  
  m_bAlt = FALSE; oqUtW3y  
  m_bShift = FALSE; g<}K^)x  
  m_Path = _T("c:\\"); uWi+F)GS^K  
  m_Number = _T("0 picture captured."); :[\}Hn=  
  nCount=0; 7CM<"pV  
  bRegistered=FALSE; Q> @0'y=s  
  bTray=FALSE; Et`z7Q*e  
 //}}AFX_DATA_INIT }@a_x,O/x}  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #.Ft PR  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); f4`=yj*  
} R:i7Rb2C  
)ZNH/9e/  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) '>2xP<ct!&  
{ mj S)*@F  
 CDialog::DoDataExchange(pDX); k\x>kJ}0  
 //{{AFX_DATA_MAP(CCaptureDlg) kQ{pFFO  
  DDX_Control(pDX, IDC_KEY, m_Key); /lAt&0  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); r+ v*(Tu  
  DDX_Check(pDX, IDC_ALT, m_bAlt); .xCO_7Rd  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 3VA Lrb;  
  DDX_Text(pDX, IDC_PATH, m_Path); m:Z=: -x  
  DDX_Text(pDX, IDC_NUMBER, m_Number); yWt87+%T  
 //}}AFX_DATA_MAP V\)@Yk2  
} SaQ_%-&#p  
vPSH  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0'z$"(6D  
//{{AFX_MSG_MAP(CCaptureDlg) !*+~R2&b  
 ON_WM_SYSCOMMAND() Yz.[CmdX  
 ON_WM_PAINT()  SvDVxK  
 ON_WM_QUERYDRAGICON() GG%j+Ed  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) H%Q@DW8~@  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) #N@sJyI N  
 ON_BN_CLICKED(ID_CHANGE, OnChange) VJZ   
//}}AFX_MSG_MAP EvQN(_  
END_MESSAGE_MAP() (ioi !p  
~i6tc d  
BOOL CCaptureDlg::OnInitDialog() K^s!0[6  
{ ']A+wGR&r  
 CDialog::OnInitDialog(); }&`#  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); {$O.@#'  
 ASSERT(IDM_ABOUTBOX < 0xF000); q=UKL`;C}U  
 CMenu* pSysMenu = GetSystemMenu(FALSE); [g_f`ZJ=  
 if (pSysMenu != NULL) p4HX83y{  
 { gWgYZX  
  CString strAboutMenu; Q[`_Y3@j  
  strAboutMenu.LoadString(IDS_ABOUTBOX); QfT&y &  
  if (!strAboutMenu.IsEmpty()) YG"P:d;s  
  { pmIQD"  
   pSysMenu->AppendMenu(MF_SEPARATOR); FeLWQn/aV6  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); $>8+t>|  
  } ?<xGO@b .  
 } QZt/Rm>W0  
 SetIcon(m_hIcon, TRUE); // Set big icon 2/qfK+a  
 SetIcon(m_hIcon, FALSE); // Set small icon ]}~*uT}>  
 m_Key.SetCurSel(0); )k <ON~x  
 RegisterHotkey(); O'A''}M  
 CMenu* pMenu=GetSystemMenu(FALSE); D8BK/E-  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); URX>(Y}g9^  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); MDl  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); rkG*0#k  
 return TRUE; // return TRUE unless you set the focus to a control SDDs}mV  
} ~\:+y  
HrEZ]iQ@O0  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) hY/SR'8  
{ 7PHvsd"]p  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 2syKYHV  
 { ,? <jue/bd  
  CAboutDlg dlgAbout; OUnt?[U\  
  dlgAbout.DoModal(); o&fAnpia=  
 } 76mQ$ze  
 else {C|#<}1  
 { WLv( K_3Y  
  CDialog::OnSysCommand(nID, lParam); %+Mi~k*A'  
 } ^nFa'=  
} Pm7,Nq)<>n  
mNWmp_c,1  
void CCaptureDlg::OnPaint() @H1pPr  
{ l J;wl|9  
 if (IsIconic()) L7%Dc2{^(  
 { $2 ~A^#"0  
  CPaintDC dc(this); // device context for painting F+*: >@3  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); n]6xrsE  
  // Center icon in client rectangle -Ufd+(   
  int cxIcon = GetSystemMetrics(SM_CXICON); t 0nGZ%`  
  int cyIcon = GetSystemMetrics(SM_CYICON); L8/o9N1  
  CRect rect; j}#48{  
  GetClientRect(&rect); 3Ki`W!C  
  int x = (rect.Width() - cxIcon + 1) / 2; i1\xZ<|0  
  int y = (rect.Height() - cyIcon + 1) / 2; |Tf}8e  
  // Draw the icon Yf7n0Etd,  
  dc.DrawIcon(x, y, m_hIcon); OT{qb!eYI  
 } #@ 3RYx  
 else Pm#B'N#*N|  
 { W>bhSKV%  
  CDialog::OnPaint(); J$j&j`  
 } !gW$A-XD  
} pj?+cy v~  
3yZtyXRPn  
HCURSOR CCaptureDlg::OnQueryDragIcon() :*)~nPVV  
{ 1sGkbfh{t  
 return (HCURSOR) m_hIcon; s80:.B  
} \*v}IO>2})  
S2;{)"mS  
void CCaptureDlg::OnCancel() q~_Nv5r%O  
{ ~}$:iyJV(>  
 if(bTray) J0C<Qb[  
  DeleteIcon(); }\OLBg/  
  CDialog::OnCancel(); +m Mn1&  
} ( y'i{:B  
4YXtl +G  
void CCaptureDlg::OnAbout() =@G#c5H*  
{ ?b^VEp.;}  
 CAboutDlg dlg; t`Mm  
 dlg.DoModal(); Czid"Ih-  
} M5: f^  
eP(%+[g  
void CCaptureDlg::OnBrowse() 'g|%Ro/  
{ gE`G3kgn{  
 CString str; Ej F<lw  
 BROWSEINFO bi; lk 1c 2  
 char name[MAX_PATH]; ipw_AC~  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); tA3]6SIK@  
 bi.hwndOwner=GetSafeHwnd(); 0$":W  
 bi.pszDisplayName=name; ](x4q  
 bi.lpszTitle="Select folder"; G5kM0vs6L  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; QKE$>G  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 9'Pyo`hJ#U  
 if(idl==NULL) S TVJu![  
  return; %0Ulh6g;Dt  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Yw\} '7  
 str.ReleaseBuffer(); ?G* XZ0u~  
 m_Path=str; .hSacd  
 if(str.GetAt(str.GetLength()-1)!='\\') z%`Tf&UL  
  m_Path+="\\"; xQk]a1  
 UpdateData(FALSE); &!N5}N&  
} }Xrs"u,  
OMvwmm  
void CCaptureDlg::SaveBmp() os/~6  
{ P@PZm  
 CDC dc; w4:n(.;HK  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 4)]g=-3  
 CBitmap bm; Olj]A]v}  
 int Width=GetSystemMetrics(SM_CXSCREEN); GWM2l?zOP  
 int Height=GetSystemMetrics(SM_CYSCREEN); 'R*xg2!i  
 bm.CreateCompatibleBitmap(&dc,Width,Height); n AoGG0$5  
 CDC tdc; \&&kUpI  
 tdc.CreateCompatibleDC(&dc); {YcVeCq+N  
 CBitmap*pOld=tdc.SelectObject(&bm); x98LOO  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); e,Gv~ae9  
 tdc.SelectObject(pOld); G"5Nj3v d  
 BITMAP btm; 6@]Xwq  
 bm.GetBitmap(&btm); Y H 2i V  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; &A*oQ3  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); LJc w->  
 BITMAPINFOHEADER bih; K.*?\)&  
 bih.biBitCount=btm.bmBitsPixel; N`8!h:yL  
 bih.biClrImportant=0; f0IljY!.  
 bih.biClrUsed=0; d?v#gW  
 bih.biCompression=0; `JG~%0Z?}  
 bih.biHeight=btm.bmHeight; Ke&lGf"5  
 bih.biPlanes=1; HsR#dp+s~  
 bih.biSize=sizeof(BITMAPINFOHEADER); @1*lmFq'kV  
 bih.biSizeImage=size; ,b-wo  
 bih.biWidth=btm.bmWidth; k]qZOO}  
 bih.biXPelsPerMeter=0; ,au64sH  
 bih.biYPelsPerMeter=0; 5caYA&R  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); N>/*)Frt  
 static int filecount=0; [YHvyfk~_  
 CString name; zv@'x nY]  
 name.Format("pict%04d.bmp",filecount++); ojs&W]r0Z  
 name=m_Path+name; q&<#)#+  
 BITMAPFILEHEADER bfh; /q uf'CV}  
 bfh.bfReserved1=bfh.bfReserved2=0; W ;P1T"*A  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ' uo`-Y  
 bfh.bfSize=54+size; u5H#(&Om  
 bfh.bfOffBits=54; p? iJ'K  
 CFile bf; j72cSRv  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ;wL *  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); U"%k4]:A  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); pvI(hjMYPk  
  bf.WriteHuge(lpData,size); SjtGU47$!  
  bf.Close(); Rb#Z'1D'G  
  nCount++; {;n?c$r  
 } }E*d)n|  
 GlobalFreePtr(lpData); wju~5  
 if(nCount==1) ,\+tvrR4X  
  m_Number.Format("%d picture captured.",nCount); Gxi;h=J2)>  
 else JEdtj1v{O  
  m_Number.Format("%d pictures captured.",nCount); (PsA[>F  
  UpdateData(FALSE); / v5Pk.!o  
} 7KRc^ *pZs  
~e 6yaX8S  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) O.& 6J/  
{ S/~6%uJ  
 if(pMsg -> message == WM_KEYDOWN) r;|Bc$P  
 { ~1|sf8  
  if(pMsg -> wParam == VK_ESCAPE) C;dA?Es>R  
   return TRUE; [cXu<vjFM  
  if(pMsg -> wParam == VK_RETURN) g_0"T}09(  
   return TRUE; tborRi)  
 } n\,TW&3  
 return CDialog::PreTranslateMessage(pMsg); wS``Q8K+dM  
} iL|*g3`-f  
l2VO=RDiW  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;cp-jY_U  
{ _q6+]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ua|qL!L+  
  SaveBmp(); oxO}m7 ULH  
  return FALSE; oq8~PTw  
} 6Wc eDY  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ j"94hWb  
 CMenu pop; 4fzq C)  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); QAygr4\X^  
 CMenu*pMenu=pop.GetSubMenu(0); 2-j|q6m5  
 pMenu->SetDefaultItem(ID_EXITICON); T2Y`q'  
 CPoint pt; R&ou4Y:DG  
 GetCursorPos(&pt); lmH!I )5  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); rt^z#2$  
 if(id==ID_EXITICON) *ivbk /8  
  DeleteIcon(); Zr}`W \  
 else if(id==ID_EXIT) pxI*vgfN7  
  OnCancel(); (g7nMrE$j  
 return FALSE; hXz"}X n  
} $XyGCn  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); B1nb23SY T  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) B{)Du :)  
 AddIcon(); ,Yi =s;E  
 return res; I=(O,*+PQ  
} :6HMb^4  
)&_{m K  
void CCaptureDlg::AddIcon() zE<vFP-1v  
{ CvbY2_>Nh  
 NOTIFYICONDATA data; ec=4L@V*  
 data.cbSize=sizeof(NOTIFYICONDATA); HS(<wI  
 CString tip; ?ZDx9*f  
 tip.LoadString(IDS_ICONTIP); Qbv)(&i# ~  
 data.hIcon=GetIcon(0); Z NCq /  
 data.hWnd=GetSafeHwnd(); zN2sipJS8  
 strcpy(data.szTip,tip); )B}]0`z:P  
 data.uCallbackMessage=IDM_SHELL; {F@;45)o  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; zh/+1  
 data.uID=98; Bj@&c>  
 Shell_NotifyIcon(NIM_ADD,&data);  }Ecm  
 ShowWindow(SW_HIDE); l\$C)q6O  
 bTray=TRUE; QRdb~f;<hj  
}  n8:2Z>  
.-RWlUe;,  
void CCaptureDlg::DeleteIcon() ]nfS vPb  
{ N"E\o,_  
 NOTIFYICONDATA data; "H G:by  
 data.cbSize=sizeof(NOTIFYICONDATA); e}K;5o=I  
 data.hWnd=GetSafeHwnd(); P]6pPS  
 data.uID=98; c$e~O-OVD?  
 Shell_NotifyIcon(NIM_DELETE,&data); f^$\+H"W  
 ShowWindow(SW_SHOW); \s~ W;m  
 SetForegroundWindow(); 3J(STIxg  
 ShowWindow(SW_SHOWNORMAL); kY_UY~E  
 bTray=FALSE; qZ1fQN1yG  
} 9 z3Iwl  
j<l>+., U  
void CCaptureDlg::OnChange() E>4 \9  
{ )$th${pd#v  
 RegisterHotkey(); Uj!L:u2b  
} 4 Qw;r  
%+pXzw`B  
BOOL CCaptureDlg::RegisterHotkey() <78> 6u/W%  
{ !2{MWj  
 UpdateData(); 58v5Z$%--  
 UCHAR mask=0; u[dI81`  
 UCHAR key=0; V KR6i  
 if(m_bControl) u"|.]r  
  mask|=4; koqH~>ZtD  
 if(m_bAlt) E&[ox[g{  
  mask|=2; ~4\bR  
 if(m_bShift) 7,+:Q Y@  
  mask|=1; |=h>3Z=r!  
  key=Key_Table[m_Key.GetCurSel()]; `q xg  
 if(bRegistered){ As)-a5!  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); pbgCcO~xm  
  bRegistered=FALSE; HuK'tU#  
 } =%]dk=n?TN  
 cMask=mask; :$}67b)MO  
 cKey=key; _FVIN;!  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ]h|GaHiE  
 return bRegistered; =3( ZUV X  
} f3596a  
L1D%vu`  
  四、小结 lT(MywNsg  
A$5!]+  
  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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