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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: {N`<TH PP  
  <}t<A  
  一、实现方法 0k 6S`e9gI  
_su$]s  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: s*UO!bHa  
f+>g_Q  
#pragma data_seg("shareddata") B^lm'/,@  
HHOOK hHook =NULL; //钩子句柄 [fl^1!3{  
UINT nHookCount =0; //挂接的程序数目 'bx$}w N  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 pHv~^L%=  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 i5CBLv  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey AA~6r[*~  
static int KeyCount =0; Yxd&hr  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ~-zch=+u  
#pragma data_seg() MNV OloA  
A i5|N  
  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。 <ecif_a=m  
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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: >'e(|P4  
Ln@n6*%(/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR q8[I` V{  
cKey,UCHAR cMask) 5@< D6>6  
{ .E&-gXJ4  
 BOOL bAdded=FALSE; ^E= w3g&  
 for(int index=0;index<MAX_KEY;index++){ < (<IRCR  
  if(hCallWnd[index]==0){ VmTPE5d  
   hCallWnd[index]=hWnd; uwhb-.w  
   HotKey[index]=cKey; tC4 7P[b  
   HotKeyMask[index]=cMask; 3PgiV%]  
   bAdded=TRUE; XXA1%Lw%  
   KeyCount++; MO-)j_o-Z  
   break; N_eZz#);  
  } t-3y`31i.  
 } 7-`iI(N<  
 return bAdded; 8nQjD<-  
} )ND%MYJSq  
//删除热键 v5`Q7ZZ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) r'~^BLT`#  
{ / +9o?Kxya  
 BOOL bRemoved=FALSE; UqEpeLK  
 for(int index=0;index<MAX_KEY;index++){ NB[(O#  
  if(hCallWnd[index]==hWnd){ 60@]^g;$I  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ f_qW+fN::s  
    hCallWnd[index]=NULL; bL"!z"NA  
    HotKey[index]=0; )[d>?%vfd  
    HotKeyMask[index]=0; U f <hzP  
    bRemoved=TRUE; v cZg3:j  
    KeyCount--; i1k#WgvZR  
    break; bUBQ  
   } 5}" @$.{i  
  } Vp~c$y+  
 } N6wCCXd  
 return bRemoved; :d,]BB  
} mpysnKH  
!&b wFO>P  
z-X_O32  
  DLL中的钩子函数如下: ::eYd23  
klwNeGF]N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)  a }m>  
{ :\<D q 71  
 BOOL bProcessed=FALSE; MzudCMF  
 if(HC_ACTION==nCode) 8BgHoQ*  
 { QqU>V0y"w(  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 j|/4V  
   switch(wParam) qPI1\!z6  
   {  %zCV>D  
    case VK_MENU: DtrR< &m  
     MaskBits&=~ALTBIT; GZ@`}7b}  
     break; U1!#TD)@  
    case VK_CONTROL: W-UMX',0zS  
     MaskBits&=~CTRLBIT; Z2cumx(  
     break; q }'ww  
    case VK_SHIFT:  o<Z  
     MaskBits&=~SHIFTBIT; b)1v:X4Bv=  
     break; X@ j.$0 eK  
    default: //judge the key and send message ccPTJ/%$  
     break; 9z0G0QW[  
   } KqI<#hUl  
   for(int index=0;index<MAX_KEY;index++){ _b)=ERBbCo  
    if(hCallWnd[index]==NULL) ;p_@%*JAx  
     continue; tW)K pX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1;8%\r[|5^  
    { .nG14i7C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); N9}27T+4  
     bProcessed=TRUE; 8uq`^l%KkZ  
    } 9>I&Z8J$M  
   } :Ou[LF.O  
  } KyQd6 1  
  else if((lParam&0xc000ffff)==1){ //有键按下 ??u*qO:p  
   switch(wParam) XGCjB{IV  
   { pcrarj  
    case VK_MENU: WNmG'hlA  
     MaskBits|=ALTBIT; wdo(K.m  
     break; +$;* "o  
    case VK_CONTROL: !CGpE=V  
     MaskBits|=CTRLBIT; J\%SAit@  
     break; 3Ud{W$Ym  
    case VK_SHIFT: k+5l  
     MaskBits|=SHIFTBIT; m*f"Y"B.1I  
     break; 5"WI^"6b:  
    default: //judge the key and send message \Aq$h:<  
     break; #M5pQ&yZy  
   } h7a/]~  
   for(int index=0;index<MAX_KEY;index++){ Mc@_[q!xY?  
    if(hCallWnd[index]==NULL) 5>!I6[{  
     continue; D_)N!,i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) r"&uW !~0  
    { F(DM$5z[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =_=0l+\}  
     bProcessed=TRUE; 5I>a|I!j  
    } nIEIb.-  
   } \f-@L;8#  
  } K0'= O  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 [R(dCq>  
   for(int index=0;index<MAX_KEY;index++){ [O@U@bD9  
    if(hCallWnd[index]==NULL) -2qI2Z  
     continue; W1 \dGskV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 044Q>Qz,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); fJK;[*&Y  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 .Mxt F\  
   } u-u:7VtH0=  
  } 1deK}5'  
 } :/\KVz'fw}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); P%y9fU2[  
} R+5yyk\  
orZwm9#].  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: -?L3"rxAP  
CuFlI?~8 z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); C {G647  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Zjn![  
S76x EL  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: *(o^w'5  
p>1Klh:8.'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) W2]%QN=m$  
{ rI'kZ0&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) /xb37,   
 { Mi<}q@]e  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 { 4B7a6  
  SaveBmp(); ~)#xOE}  
  return FALSE; L"'L@ A|U  
 } %:.IG.`d  
 …… //其它处理及默认处理 1>)uI@?Rb  
} v M $Tn  
97n,^t2F\  
J@RV^2  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 k8w:8*y'.  
,ik\MSS  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 F>ps& h  
DG/<#SCF  
  二、编程步骤 Z9UNp[  0  
DIWcX<s  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; J\Z\q  
t Z]b0T(e  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; bdyIt)tK+  
"FXT8Qxg  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; +.|8W!h`1  
%5/h;4   
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 9m}c2:p  
^w~Utx4  
  5、 添加代码,编译运行程序。 iYz!:TxP  
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三、程序代码 JDm7iJxc_  
i]IZ0.?Y  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL YCu9dBeVS  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) (\ Gs7  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ T0lbMp  
#if _MSC_VER > 1000 uDG#L6  
#pragma once T^.W'  
#endif // _MSC_VER > 1000 S@eI3Pk E  
#ifndef __AFXWIN_H__ y0cB@pWp  
#error include 'stdafx.h' before including this file for PCH ^?gs<-)B  
#endif P*6&0\af|  
#include "resource.h" // main symbols <rFKJ^B  
class CHookApp : public CWinApp bId@V[9  
{ UU 2 =W  
 public: H8?Kgaj~vf  
  CHookApp(); ompkDl\E  
  // Overrides jl~?I*Gr  
  // ClassWizard generated virtual function overrides /]"2;e-s+  
  //{{AFX_VIRTUAL(CHookApp) kV3Zt@+  
 public: tJ@5E^'4  
  virtual BOOL InitInstance(); 9UeK}Rl^n  
  virtual int ExitInstance(); 06~HVv  
  //}}AFX_VIRTUAL J;cTEB  
  //{{AFX_MSG(CHookApp) ~$Pz`amT|  
  // NOTE - the ClassWizard will add and remove member functions here. j?'It`s  
  // DO NOT EDIT what you see in these blocks of generated code !  QKtTy>5  
  //}}AFX_MSG Rjz~n38.  
  DECLARE_MESSAGE_MAP() >s+*D=k  
}; J\x.:=V  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); l-RwCw4f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); uQlQ%n%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [p# }=&d  
BOOL InitHotkey(); o$_,2$>mn  
BOOL UnInit(); uGMmS9v$ J  
#endif )I`Ma6bX  
^z\*; f  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. QSq0{  
#include "stdafx.h" G@Y!*ZH*f  
#include "hook.h" c})f&Z@<  
#include <windowsx.h> mh=YrDU+L  
#ifdef _DEBUG f]Q`8nU  
#define new DEBUG_NEW D!d1%hac  
#undef THIS_FILE a@&P\"k  
static char THIS_FILE[] = __FILE__; $D)Ajd;  
#endif kKP<K+hH  
#define MAX_KEY 100 j"c30AY  
#define CTRLBIT 0x04 -%eBip,'yl  
#define ALTBIT 0x02 nVt,= ?_ U  
#define SHIFTBIT 0x01 n^2p jTkl  
#pragma data_seg("shareddata") $06[D91'  
HHOOK hHook =NULL; QFtf.")[.  
UINT nHookCount =0; x<es1A'u6  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey U2D2?#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ;9rS[$^$O  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey zZax![Z  
static int KeyCount =0; ~!& "b1  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift H${5pY_M  
#pragma data_seg() 86AZ)UP2D  
HINSTANCE hins; Ob#d;F  
void VerifyWindow(); /$ :w8  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) JgmX=6N  
//{{AFX_MSG_MAP(CHookApp) \6)]!$F6:  
// NOTE - the ClassWizard will add and remove mapping macros here. -)p S\$GC  
// DO NOT EDIT what you see in these blocks of generated code! 0;V "64U  
//}}AFX_MSG_MAP t.`&Q|a  
END_MESSAGE_MAP() V|n}v?f_q  
k:qS'  
CHookApp::CHookApp() `, lry7]  
{ y9xvGr[l  
 // TODO: add construction code here, 3\B 28m  
 // Place all significant initialization in InitInstance &xYO6_.  
} qTuQ]*[-  
ac%6eW0#  
CHookApp theApp;  UqwU3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) H-|%\9&{S  
{ j LS<S_`  
 BOOL bProcessed=FALSE; u9zEhfg8  
 if(HC_ACTION==nCode) p"UdD  
 { MoX~ZewWR  
  if((lParam&0xc0000000)==0xc0000000){// Key up * ",/7(  
   switch(wParam) S<Os\/*  
   { cM hBOm*  
    case VK_MENU: k:QeZn(  
     MaskBits&=~ALTBIT; 9>6DA^  
     break; BH"OphE  
    case VK_CONTROL: 2Pm[ kD4E=  
     MaskBits&=~CTRLBIT; uSgR|b;R]  
     break; VchI0KL?  
    case VK_SHIFT: JuKG#F#,  
     MaskBits&=~SHIFTBIT; |W#(+m  
     break; 6Lc{SR  
    default: //judge the key and send message yt@7l]I  
     break; cTJi8f=g  
   } -k8<LR3  
   for(int index=0;index<MAX_KEY;index++){ DEw>f%&4  
    if(hCallWnd[index]==NULL) BICG@  
     continue; .mbqsb]&Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @u @~gEt  
    { qipV'T,S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2rV]n  
     bProcessed=TRUE; OAauD$Hh  
    } \_]X+o;  
   } (hJ&`Tt  
  } 4OaU1Y[  
  else if((lParam&0xc000ffff)==1){ //Key down tiGBjTPt  
   switch(wParam) :;hz!6!  
   { 7,lnfCm H  
    case VK_MENU: lsaA    
     MaskBits|=ALTBIT; U EjP`  
     break; ;aN_!! r  
    case VK_CONTROL: 5MCnGg@  
     MaskBits|=CTRLBIT; QdrZi.qKH  
     break; smUSR4VK  
    case VK_SHIFT: /rIyW?& f  
     MaskBits|=SHIFTBIT; lQM&q  
     break; :N^+!,i  
    default: //judge the key and send message z ub"Ap3  
     break; b} 0G~oLP  
   } ZuFcJ?8i  
   for(int index=0;index<MAX_KEY;index++) Vak\N)=u  
   { ?KtF!:_C  
    if(hCallWnd[index]==NULL) =(]Z%Q-V  
     continue; &,l(2z[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) AP:Q]A6}  
    { I`f5)iF?0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \$4 [qG=  
     bProcessed=TRUE; 3;RQ\{eM  
    } R4y]<8}  
   } M$48}q+  
  } ZZn$N-  
  if(!bProcessed){ 7 x'2  
   for(int index=0;index<MAX_KEY;index++){ uOO\!Hqq  
    if(hCallWnd[index]==NULL) ysj5/wtO0  
     continue; apOa E7|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Kl,NL]]4*5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); JC MUK<CG  
   } V3>tW,z  
  } h UC157  
 } |M&4[ka}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3K=%I+G(4  
} p0[+Zm{#l  
.VCF[AleS  
BOOL InitHotkey() D 5bPF~q  
{ )bWopc  
 if(hHook!=NULL){  l*?_@  
  nHookCount++; Z]e`bfNnI  
  return TRUE; lSg[7lt  
 } !:PiQ19 'u  
 else -.Blj<2ah  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); _%[po%]  
  if(hHook!=NULL) {h=gnR-9  
   nHookCount++; 84WX I#BH  
  return (hHook!=NULL); >J5C.hx  
} T]JmnCX>:  
BOOL UnInit() \h"U+Bv7  
{ \_  V*Cs  
 if(nHookCount>1){ _u+ 7>  
  nHookCount--; NS65F7<&  
  return TRUE; P(3k1SM  
 } [#9i@40  
 BOOL unhooked = UnhookWindowsHookEx(hHook); WfD fj  
 if(unhooked==TRUE){ EV?U !O  
  nHookCount=0; Z}TLk^_[  
  hHook=NULL; g)5mr:\  
 } \BuyJskE  
 return unhooked; ?j0yT@G  
} oOLey!uZw  
au04F]-|j8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) vK%*5  
{ -p>~z )  
 BOOL bAdded=FALSE; !~&& &85  
 for(int index=0;index<MAX_KEY;index++){ xeL"FzF:V  
  if(hCallWnd[index]==0){ S=0DQ19  
   hCallWnd[index]=hWnd; b[GhI+_  
   HotKey[index]=cKey; m<49<O6o  
   HotKeyMask[index]=cMask; RC/45:hZZ  
   bAdded=TRUE; (6.uNLr  
   KeyCount++; ^?$,sS ;Q  
   break; nTv}/M&  
  } vQ L$.A3>  
 } LFI#wGhXVk  
 return bAdded; l>MDCqV  
} HhL;64OYa  
{#ynN`tLyF  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) FieDESsX>  
{ m`l9d4p w?  
 BOOL bRemoved=FALSE; FJDE48Vi  
 for(int index=0;index<MAX_KEY;index++){ z)S6f79`Q  
  if(hCallWnd[index]==hWnd){ f"KrPx!^b  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \XPGA uEo  
    hCallWnd[index]=NULL; <^\rv42'(2  
    HotKey[index]=0; j)2I+[aoB  
    HotKeyMask[index]=0; T8|5%Y  
    bRemoved=TRUE; Kp6 @?  
    KeyCount--; s/=%kCo  
    break; 4 s ax  
   } 'w27Lt'V  
  } *I)J%#  
 } uN:KivVe  
 return bRemoved; HeO:=OE~>  
}  kDE-GX"Y  
kzjuW  
void VerifyWindow() ujRXAN@mC  
{ +4.s4&f)  
 for(int i=0;i<MAX_KEY;i++){  #D4  
  if(hCallWnd!=NULL){ {BmqUoZrC  
   if(!IsWindow(hCallWnd)){ G.H8 ><%  
    hCallWnd=NULL; {g! 7K  
    HotKey=0; : oXSh;\  
    HotKeyMask=0; 4/Y?eUQ  
    KeyCount--; J\r\_P@;c  
   } ]bJz-6u#:  
  } QJ3#~GYNr  
 } "~5cz0 H3v  
} P{-- R\  
HJ]xZ83pC  
BOOL CHookApp::InitInstance() | L8 [+_m  
{ R7/S SuG6\  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Xva(R<W7d<  
 hins=AfxGetInstanceHandle(); bAPMD  
 InitHotkey(); G;3%k.{  
 return CWinApp::InitInstance(); 7-``J#9=  
} 4 kjfYf@A  
 ,\s`T O  
int CHookApp::ExitInstance() Z-Uu/GjB  
{ lcie6'<  
 VerifyWindow(); )A$"COM4  
 UnInit(); DxV=S0P  
 return CWinApp::ExitInstance(); ${MzO i  
} x-m*p^}  
T@tsM|pI  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file (T_-`N|  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) hO]F\0+  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 3uocAmY  
#if _MSC_VER > 1000 z.Ic?Wz7  
#pragma once bGCC?}\  
#endif // _MSC_VER > 1000 ==OUd6e}  
/)6T>/  
class CCaptureDlg : public CDialog &t^*0/~  
{ 2n,z`(=  
 // Construction &{V|%u}v  
 public: gS5REC4I/  
  BOOL bTray; !?nO0Ao-$  
  BOOL bRegistered; KClkPL!jP  
  BOOL RegisterHotkey(); %dzt'uz  
  UCHAR cKey; TP rq:"K  
  UCHAR cMask; NX& dJ 6a  
  void DeleteIcon(); He(65ciT<O  
  void AddIcon(); Jy)=TJ!y  
  UINT nCount; w'K7$F51  
  void SaveBmp(); i%-yR DIX  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Q>,&@  
  // Dialog Data z2iMpZ  
  //{{AFX_DATA(CCaptureDlg) (oG YnN,2  
  enum { IDD = IDD_CAPTURE_DIALOG }; }PBme'kP  
  CComboBox m_Key; Byc;r-Q5V  
  BOOL m_bControl; J'}+0mln  
  BOOL m_bAlt; m$p}cok#+S  
  BOOL m_bShift; rLsY_7!  
  CString m_Path; E`o_R=%  
  CString m_Number; /_0B5 ,6R  
  //}}AFX_DATA ,`}y J*7  
  // ClassWizard generated virtual function overrides pUHgjwT'U  
  //{{AFX_VIRTUAL(CCaptureDlg) "E\vdhk  
 public: ,~Mf2Y#m0p  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ^%$IdDx  
 protected: 9;+&}:IVS  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -D~K9u]U_  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); VcrMlcnO  
  //}}AFX_VIRTUAL @Chl>s  
  // Implementation `;j1H<L  
 protected: +MX~1RU+  
  HICON m_hIcon; : :>|[ND  
  // Generated message map functions tnJ7m8JmC  
  //{{AFX_MSG(CCaptureDlg) ] 0X|_bU  
  virtual BOOL OnInitDialog(); wH ,PA:  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Pvc)-A  
  afx_msg void OnPaint(); <D.E .^Y  
  afx_msg HCURSOR OnQueryDragIcon(); !-lI<$S:  
  virtual void OnCancel(); N;3!oo4  
  afx_msg void OnAbout(); sfX~X/  
  afx_msg void OnBrowse(); uOA/r@7I}S  
  afx_msg void OnChange(); k+9F;p7  
 //}}AFX_MSG g>VtPS5 y  
 DECLARE_MESSAGE_MAP() q-(~w!e  
}; z\m$>C|  
#endif U4"^NLAq  
|8'}mjs.Q  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file L<!h3n  
#include "stdafx.h" b-_l&;NWg  
#include "Capture.h" AwZ@)0Wy  
#include "CaptureDlg.h" $mPR)T  
#include <windowsx.h> uOv<*Jld*  
#pragma comment(lib,"hook.lib") KR ( apO  
#ifdef _DEBUG PEI$1,z  
#define new DEBUG_NEW {N2GRF~c-y  
#undef THIS_FILE 8xLQ" l+"  
static char THIS_FILE[] = __FILE__; *|y'%y  
#endif ww{k_'RRJ  
#define IDM_SHELL WM_USER+1 FEk9a^Xyx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Xex7Lr&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X%YZQc9  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; CH4Nz'X2  
class CAboutDlg : public CDialog 6>WkisxG  
{ jWUrw  
 public: 9K& $8aD  
  CAboutDlg(); ^UvL1+  
  // Dialog Data 0XA\Ag\`G  
  //{{AFX_DATA(CAboutDlg) !f/K:CK|  
  enum { IDD = IDD_ABOUTBOX }; 2U[/"JL  
  //}}AFX_DATA >)WE3PT/O"  
  // ClassWizard generated virtual function overrides u.2X "  
  //{{AFX_VIRTUAL(CAboutDlg) k{f1q>gd  
 protected: f! +d*9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support fz|*Plv  
  //}}AFX_VIRTUAL D9g*+KM&  
  // Implementation `:iMGq ZN  
 protected: (csk   
  //{{AFX_MSG(CAboutDlg) U<=TAWZ@  
  //}}AFX_MSG gveGBi  
  DECLARE_MESSAGE_MAP() |B (,53  
}; aG7Lm2{c"  
OAkqPG&w  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @wXYza0|d  
{ ":eyf 3M  
 //{{AFX_DATA_INIT(CAboutDlg) I;XM4a  
 //}}AFX_DATA_INIT XO;_F"H=  
} D\G 8p;  
=_OJ 7K'  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) z"< S$sDh  
{ ;rf{T[i  
 CDialog::DoDataExchange(pDX); :7(fBf5  
 //{{AFX_DATA_MAP(CAboutDlg) Sqp91[,  
 //}}AFX_DATA_MAP L[zTT\a  
} S_sHwObFu|  
>(2;(TbQm0  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) q}_8iDO6  
 //{{AFX_MSG_MAP(CAboutDlg) OkRb3}  
 // No message handlers 2po8n _  
 //}}AFX_MSG_MAP <\~@l^lU  
END_MESSAGE_MAP() +IXr4M&3  
Ls2,+yo]>  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Idu'+O4  
: CDialog(CCaptureDlg::IDD, pParent) eV_ ",W  
{ MTwzL<@$  
 //{{AFX_DATA_INIT(CCaptureDlg) b|87=1^m[  
  m_bControl = FALSE; 9+(b7L   
  m_bAlt = FALSE; %{ U (y#  
  m_bShift = FALSE; ]fY:+Ru  
  m_Path = _T("c:\\"); :LuA6  
  m_Number = _T("0 picture captured."); &v]xYb)+<  
  nCount=0; 6<z#*`U1  
  bRegistered=FALSE; jXx~ 5  
  bTray=FALSE; -qSGa;PJ  
 //}}AFX_DATA_INIT HA c"&#pG  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 XyB_8(/E  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 6Lq8#{/]u  
} ]#N8e?b,  
;- i)}<  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) vo#$xwm1  
{ k Jz^\Re  
 CDialog::DoDataExchange(pDX); un\o&0}  
 //{{AFX_DATA_MAP(CCaptureDlg) FpB3SJ6 B  
  DDX_Control(pDX, IDC_KEY, m_Key); XFFm 'W6@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); fhk(<KZvJ  
  DDX_Check(pDX, IDC_ALT, m_bAlt); o JVdFE  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); c @lF*"4  
  DDX_Text(pDX, IDC_PATH, m_Path); &xr(Kb  
  DDX_Text(pDX, IDC_NUMBER, m_Number); &#C|  
 //}}AFX_DATA_MAP cm!vuoB~~  
} iJZvVs',  
:"Vmy.xq  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ZHRMW'Ne  
//{{AFX_MSG_MAP(CCaptureDlg) 3Q&@l49q  
 ON_WM_SYSCOMMAND() z>W?\[E<2  
 ON_WM_PAINT() #Hy9 ;Q  
 ON_WM_QUERYDRAGICON() f/ 3'lPK^  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) .mnkV -m  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 7LaRFL.,kO  
 ON_BN_CLICKED(ID_CHANGE, OnChange) M3eSj`c3  
//}}AFX_MSG_MAP BD$Lf,_  
END_MESSAGE_MAP() J^WX^".E  
dRs\e(H'  
BOOL CCaptureDlg::OnInitDialog() # - L<  
{ 'QpDx&~QP  
 CDialog::OnInitDialog(); {DVMs|5;^  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 5/hgWG6.t  
 ASSERT(IDM_ABOUTBOX < 0xF000); ga'G)d3oS  
 CMenu* pSysMenu = GetSystemMenu(FALSE); {#=o4~u%;H  
 if (pSysMenu != NULL) .Z`xNp  
 { U4"&T,'lTL  
  CString strAboutMenu; )REegFN@  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 55b/giX  
  if (!strAboutMenu.IsEmpty()) CT\rx>[J.6  
  { s4Jy96<  
   pSysMenu->AppendMenu(MF_SEPARATOR); Gp_flGdGQ  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); rZAP3)dA  
  } h5vetci/  
 } 6R2F,b(_  
 SetIcon(m_hIcon, TRUE); // Set big icon MO1H?U hx  
 SetIcon(m_hIcon, FALSE); // Set small icon =BD |uIR  
 m_Key.SetCurSel(0); RP^L.X(7^  
 RegisterHotkey(); (Ms0pm-#t  
 CMenu* pMenu=GetSystemMenu(FALSE); c r18`xU  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); M)v='O<H8  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 8XCT[X  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ZP:+'\&J  
 return TRUE; // return TRUE unless you set the focus to a control 2Z9ck|L>  
} U[pR `u  
HKC&grp  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Wa!C2nB  
{ `OZiN;*|  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 1k%HGQM{  
 { Ea[SS@'R  
  CAboutDlg dlgAbout; .*?-j?U.  
  dlgAbout.DoModal(); Dz$dJF1 8  
 } "-HWw?rx/  
 else 6m:$RW  
 { p`"Ic2xPJ  
  CDialog::OnSysCommand(nID, lParam); uowdzJ7  
 } x=W5e ^0?  
} 1Si$Q  
-LFk7a  
void CCaptureDlg::OnPaint() Yi`DRkp]3  
{ do.XMdit  
 if (IsIconic()) |*~SR.[`  
 { (76tYt~I=  
  CPaintDC dc(this); // device context for painting nGDY::nUE  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 3z k},8fu  
  // Center icon in client rectangle K,bX<~e5  
  int cxIcon = GetSystemMetrics(SM_CXICON); v# fny  
  int cyIcon = GetSystemMetrics(SM_CYICON); _GoFwVO  
  CRect rect; T0o0_R  
  GetClientRect(&rect); r0<zy_d'  
  int x = (rect.Width() - cxIcon + 1) / 2; LCSJIt  
  int y = (rect.Height() - cyIcon + 1) / 2; -|:mRAe  
  // Draw the icon fndH]Yp  
  dc.DrawIcon(x, y, m_hIcon); WQ{^+C9g'1  
 } {(d 6of`C_  
 else #A~7rH%hi  
 { 5sB~.z@  
  CDialog::OnPaint(); b. :2x4  
 } >+%0|6VSb  
} H@|m^1  
Kciz^)'Z  
HCURSOR CCaptureDlg::OnQueryDragIcon() IR8qFWDZ  
{ 2%-/}'G*  
 return (HCURSOR) m_hIcon; /RF&@NJE5  
} #=ko4?Wr(  
bhKe"#m|S  
void CCaptureDlg::OnCancel() K7,Sr1O `  
{ y+' ,jM  
 if(bTray) K:$GmV9o  
  DeleteIcon(); 3my_Gp  
  CDialog::OnCancel(); A*kN I  
} *"V) h I5  
u&j_;Y!6  
void CCaptureDlg::OnAbout() $b )k  
{ #Fh:z4  
 CAboutDlg dlg; \O*W/9 +  
 dlg.DoModal(); 7#P Q1UWl  
} (ul_bA+  
%y+v0.aWH+  
void CCaptureDlg::OnBrowse() bc6|]kB:  
{ =>e> r~cW  
 CString str; +[V.yY/t|>  
 BROWSEINFO bi; pWeD,!f  
 char name[MAX_PATH]; MZ^(BOe_  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ZQsVSz( 1  
 bi.hwndOwner=GetSafeHwnd(); Bl+PJ 0  
 bi.pszDisplayName=name; cOdgBi  
 bi.lpszTitle="Select folder"; f5*hOzKG6  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; -S%Uw  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); RV@mAw.T  
 if(idl==NULL) 7Y 4!   
  return; G#.q%Up  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); DNRWE1P2bg  
 str.ReleaseBuffer(); T9YrB  
 m_Path=str; QOv@rP/  
 if(str.GetAt(str.GetLength()-1)!='\\') w*7wSP  
  m_Path+="\\"; Dd:48sN:Jq  
 UpdateData(FALSE); b}ODc]3  
} (I#3![q  
QRdh2YH`  
void CCaptureDlg::SaveBmp() }n k [WW  
{ _"#n%@  
 CDC dc; >%c>R'~h  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); vSo,,~ F  
 CBitmap bm; 50Ov>(f@7  
 int Width=GetSystemMetrics(SM_CXSCREEN); gq.l=xS  
 int Height=GetSystemMetrics(SM_CYSCREEN); 4@9xq<<5  
 bm.CreateCompatibleBitmap(&dc,Width,Height); nx5I  
 CDC tdc; q]Af I(  
 tdc.CreateCompatibleDC(&dc); oUL4l=dj.  
 CBitmap*pOld=tdc.SelectObject(&bm); rotu#?B  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); CE|rn8MB  
 tdc.SelectObject(pOld); Lr*\LP6jx3  
 BITMAP btm; [$`%ve  
 bm.GetBitmap(&btm); .|KBQMI  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; /Uni6O)oc  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); {Lsl2@22  
 BITMAPINFOHEADER bih; =A_fL{ SM  
 bih.biBitCount=btm.bmBitsPixel; (~?p`g+I.P  
 bih.biClrImportant=0; "6i3'jc`  
 bih.biClrUsed=0; OgCz[QXr_  
 bih.biCompression=0; (J.k\d   
 bih.biHeight=btm.bmHeight; x-~=@oiv  
 bih.biPlanes=1; : CP,DO  
 bih.biSize=sizeof(BITMAPINFOHEADER); ka*#O"}L8  
 bih.biSizeImage=size; FlT5R*m  
 bih.biWidth=btm.bmWidth; WIw*//nw  
 bih.biXPelsPerMeter=0; xk s M e  
 bih.biYPelsPerMeter=0; jaQH1^~l/-  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); *_K*GCy  
 static int filecount=0; ULzrJbP'7  
 CString name; o`Q.;1(Y'  
 name.Format("pict%04d.bmp",filecount++); sE[ Yg8yAt  
 name=m_Path+name; h*\u0yD)  
 BITMAPFILEHEADER bfh; [-VIojs+u  
 bfh.bfReserved1=bfh.bfReserved2=0; @jKB[S;JSn  
 bfh.bfType=((WORD)('M'<< 8)|'B'); L fZF  
 bfh.bfSize=54+size; b[~-b  
 bfh.bfOffBits=54; /])P{"v$^  
 CFile bf; ]&X}C{v)G  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ mTLJajE/  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ]$I}r= Em  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); /z: mi  
  bf.WriteHuge(lpData,size); Yzw[.(jc}  
  bf.Close(); H4<Q}([w  
  nCount++; 'i4L.&  
 } l\ Vr D2j8  
 GlobalFreePtr(lpData); $t0JfDd6Ky  
 if(nCount==1) _7'5IA  
  m_Number.Format("%d picture captured.",nCount);  upGLZ#  
 else _IWLC{%V  
  m_Number.Format("%d pictures captured.",nCount); QSOG(}w  
  UpdateData(FALSE); 9A *gW j  
} ]D,\(|  
-L!lJ  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) x kdC -S  
{ 6!wk5#  
 if(pMsg -> message == WM_KEYDOWN) (QQkXlJ  
 { 6i%X f i  
  if(pMsg -> wParam == VK_ESCAPE) i ;^Ya  
   return TRUE; ~nApRC)0  
  if(pMsg -> wParam == VK_RETURN) S1U[{R?,  
   return TRUE; w[AL'1s]  
 } ]88qjKL  
 return CDialog::PreTranslateMessage(pMsg); 0B: v0 R  
} KtHkLYOCG  
]`M2Kwp  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ygQe'S{!S\  
{ -,2CMS#N  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ .aR9ulS  
  SaveBmp(); z7TyS.z  
  return FALSE; 6w[EJ;=p_  
} )W&{OMr  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ W:K '2j  
 CMenu pop; PlCj<b1D:  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); gyuBmY  
 CMenu*pMenu=pop.GetSubMenu(0); K|I<kA~!H  
 pMenu->SetDefaultItem(ID_EXITICON); 3cF8DNh  
 CPoint pt; /*MioaQB}p  
 GetCursorPos(&pt); ]'pL*&"X  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); M~~)tJYsu  
 if(id==ID_EXITICON) t(jE9t|2e6  
  DeleteIcon(); n}c~+ 0`un  
 else if(id==ID_EXIT) bAwKmk9C  
  OnCancel(); egVKAR-  
 return FALSE; 4iss j$  
} qw{`?1[+  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); x_r*<?OZ  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) hw(\3h()  
 AddIcon(); B<0Kl.V  
 return res; Sb(OG 6  
} n#@Qd!uzM  
;%;||?'v  
void CCaptureDlg::AddIcon() F~eY'~&H}  
{ -+0kay%  
 NOTIFYICONDATA data; $m A2 AI  
 data.cbSize=sizeof(NOTIFYICONDATA); RGrQ>'RL  
 CString tip; b`@J"E}  
 tip.LoadString(IDS_ICONTIP); 7VL|\^Y`q  
 data.hIcon=GetIcon(0); na"!"C s3  
 data.hWnd=GetSafeHwnd(); T"<)B^8f  
 strcpy(data.szTip,tip); 7Gy:T47T\@  
 data.uCallbackMessage=IDM_SHELL; 'u~0rMe4})  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; J_?v=dW`  
 data.uID=98; :Qh rh(i  
 Shell_NotifyIcon(NIM_ADD,&data); b'Km-'MtH  
 ShowWindow(SW_HIDE); "p7nngn~  
 bTray=TRUE; U_ l9CZ  
} B{*{9!(l9  
Gr#3GvL  
void CCaptureDlg::DeleteIcon() u@CQ+pnf:(  
{ gd*2*o$g(  
 NOTIFYICONDATA data; :2K@{~8r  
 data.cbSize=sizeof(NOTIFYICONDATA); " m13HS  
 data.hWnd=GetSafeHwnd(); keFH CC  
 data.uID=98; 2t PfIg  
 Shell_NotifyIcon(NIM_DELETE,&data); {Ay dt8  
 ShowWindow(SW_SHOW); ~9E_L?TW*  
 SetForegroundWindow(); D~#%^a+Aq_  
 ShowWindow(SW_SHOWNORMAL); [:cvy[}v@  
 bTray=FALSE; =E<H_cUS  
} }pIn3B)  
kDI?v6y5  
void CCaptureDlg::OnChange() !?=U{^|7y  
{ _^NyLI%  
 RegisterHotkey(); t"Ah]sD  
} cv G*p||  
Id&e'  
BOOL CCaptureDlg::RegisterHotkey() B(ktIy  
{ @&Bh!_TWc  
 UpdateData(); E&eY79  
 UCHAR mask=0; +@~WKa  
 UCHAR key=0; %S'+x[ 4W  
 if(m_bControl) q=Vh"]0g  
  mask|=4; .ESvMK~x  
 if(m_bAlt) >0W P:-\*  
  mask|=2; S0Q LM)  
 if(m_bShift) E2d'P  
  mask|=1; .Z  67  
  key=Key_Table[m_Key.GetCurSel()]; y^ |u'XK  
 if(bRegistered){ O^j*"#f  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); &K{8- t  
  bRegistered=FALSE; ');vc~C  
 } rQyjNh  
 cMask=mask; }ML2-k  
 cKey=key; &lLfVa-l  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); U||GeEd  
 return bRegistered; `;J`O02  
} YWvD+  
 ,w3-*z  
  四、小结 qz{9ND| )  
fBj)HoHQW  
  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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