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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: <+1w'-  
  t;f p<z7N.  
  一、实现方法 8wx#,Xa  
Y*X6lo  
  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: ht cO ~b  
F]&J%i F[  
#pragma data_seg("shareddata") #O974f8  
HHOOK hHook =NULL; //钩子句柄 ZWe$(?  
UINT nHookCount =0; //挂接的程序数目 ^{sI'l~  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Ud(dWj-/  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 /$4?.qtu  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey A)p! w aG  
static int KeyCount =0; "ZPbK$+=yU  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 t T/*ZzMq#  
#pragma data_seg() ^~1@HcJo  
w!h{P38  
  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。 Lzx(!<v  
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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: xg1r 3  
_<~Vxz9  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR w.F3o4YP  
cKey,UCHAR cMask) xfV2/A#h  
{ Yw1q2jT  
 BOOL bAdded=FALSE; P}u<NPy3Q  
 for(int index=0;index<MAX_KEY;index++){ &i}cC4i   
  if(hCallWnd[index]==0){ f'yd {ihFp  
   hCallWnd[index]=hWnd; laL4ez  
   HotKey[index]=cKey; n\)f.}YD8d  
   HotKeyMask[index]=cMask; 1bAp{u&  
   bAdded=TRUE; Mn{Rg>X  
   KeyCount++; j9fL0$+FI  
   break; 3eDx@8N }  
  } ?*5l}y=  
 } ~hw4gdtS  
 return bAdded; u H;^>`DT  
} e5\1k#@  
//删除热键 #Q)w$WR  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S5 oHe4#89  
{ |;1:$E"  
 BOOL bRemoved=FALSE; op{(mn  
 for(int index=0;index<MAX_KEY;index++){ 0QSi\: 1f  
  if(hCallWnd[index]==hWnd){ g wjv&.T6^  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )Zr0_b"V:e  
    hCallWnd[index]=NULL; YG+ Yb{^"  
    HotKey[index]=0; (#Kvm  
    HotKeyMask[index]=0; %_LHD|<  
    bRemoved=TRUE; r ($t.iS  
    KeyCount--; ',ybHW%D%i  
    break; ba1QFzN  
   } Oua/NF)  
  } jM@I"JZ b  
 } MZF ;k$R  
 return bRemoved; \z?;6A  
} w [x+2  
Z]+Xh  
tKViM@T  
  DLL中的钩子函数如下: ;+Kewi;<  
Iur} ZAz  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) v%e"4:K}?  
{ 8@#Y <{  
 BOOL bProcessed=FALSE; (Q} ijwj  
 if(HC_ACTION==nCode) BPs &  
 { PbH]K$mj{"  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Y##P9^zH1  
   switch(wParam) b#'a4j-u  
   {  @wZ_VE7B  
    case VK_MENU: sbhEZ#7#  
     MaskBits&=~ALTBIT; z4UQ:z@  
     break; vu \Dx9  
    case VK_CONTROL: @G{DOxE*  
     MaskBits&=~CTRLBIT; |#kf.kN  
     break; AiI# "  
    case VK_SHIFT: ~Q\ZDMTK  
     MaskBits&=~SHIFTBIT; Q$5:P&  
     break; (ZSSp1R v  
    default: //judge the key and send message 'V{k$}P2  
     break; cuk}VZ  
   } a8U2c;  
   for(int index=0;index<MAX_KEY;index++){ F!t13%yeu?  
    if(hCallWnd[index]==NULL) P@? '@.e  
     continue; } dlNMW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tzN;;h4C  
    { 6$.Xj\zl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~"B[6^sW  
     bProcessed=TRUE; hfc!M2/w  
    } 3c6)  
   } daNIP1Qn  
  } ];]EK6dzG  
  else if((lParam&0xc000ffff)==1){ //有键按下 pLcng[  
   switch(wParam) :Djp\ e6!  
   { GlZDuU  
    case VK_MENU: \F3t&:  
     MaskBits|=ALTBIT; {q4"x5|  
     break; ,DZLEsFM  
    case VK_CONTROL: 6K0*?j{;"  
     MaskBits|=CTRLBIT; " <AljgF  
     break; =Z$6+^L  
    case VK_SHIFT: U#4W"1~iX  
     MaskBits|=SHIFTBIT; U.x.gZRo[  
     break; 0:8'Ov(  
    default: //judge the key and send message Ut=y`]F  
     break; |Ay#0uQ5Y  
   } 5xKR ]u  
   for(int index=0;index<MAX_KEY;index++){ SQk!o{  
    if(hCallWnd[index]==NULL) ,:,|A/U  
     continue; 1OL~)X3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n|6yz[N  
    { uIwyan-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); D1k]  
     bProcessed=TRUE; y_#wR/E)u{  
    } `,"Jc<R7Z  
   } jL1UPN  
  } fok#D>q  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 =;T[2:JUu  
   for(int index=0;index<MAX_KEY;index++){ >?KyPp  
    if(hCallWnd[index]==NULL) Y8(yOVy9  
     continue; 39CPFgi<l*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 2{N0.  |5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0qd`Pf   
     //lParam的意义可看MSDN中WM_KEYDOWN部分 |<$O5b'  
   } kA0 ^~  
  } VxoMK7'O=/  
 } +\Q@7Lj  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); rz*Jmn b  
} Ek0.r)Nw  
k,& QcYw  
  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: M}u2aW2]X  
/2q%'"x(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )M~5F,)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?`$4ZDM  
z_)$g= 9$  
  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: +L6$Xm5DAv  
"'L SLp  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) zx*f*L,6F  
{ ]&>)=b!,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) #96a7K  
 { Y*f<\z(4  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 LTHS&3% 2  
  SaveBmp(); S;~_9i]upe  
  return FALSE; I%Z &i-33y  
 } b`mEnI VIz  
 …… //其它处理及默认处理 Tj:F Qnx  
} vvCGzOv  
B7;MY6h#  
" B1' K8  
  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。 )uP= o  
b3H;Ea?^^<  
  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。 DS yE   
$fKWB5p|()  
  二、编程步骤 lk|/N^8M  
HZNX1aQ|Q#  
  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"; v:'y&yS  
2+HiaYDZ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; $[Ns#7K  
X+iULr.^`~  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; YeVhWPn@  
joq ;N]S  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; n$QFj'  
,bJx| K  
  5、 添加代码,编译运行程序。 Bb)J8,LQ  
n)yqb  
三、程序代码 ( _2eiE71  
l:+1j{ d7  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Up:#Zs2  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ]@EjKgs  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ U,N4+F}FR  
#if _MSC_VER > 1000 A}8U;<\Ig  
#pragma once IftPN6(Z  
#endif // _MSC_VER > 1000 %?seX+ne  
#ifndef __AFXWIN_H__ #,sJd^uI  
#error include 'stdafx.h' before including this file for PCH :L,]<n  
#endif EHOdst  
#include "resource.h" // main symbols M6>l%[  
class CHookApp : public CWinApp +t f=  
{ yd k  
 public: @gd-lcMYW  
  CHookApp(); PNq#o%q  
  // Overrides  f!<mI8H  
  // ClassWizard generated virtual function overrides Kmtr.]Nj  
  //{{AFX_VIRTUAL(CHookApp) lU?"\m  
 public: 1EN5ZN,  
  virtual BOOL InitInstance(); W!g ,  
  virtual int ExitInstance(); I`|>'$E[r  
  //}}AFX_VIRTUAL Ua4} dW[w  
  //{{AFX_MSG(CHookApp) zI(Pti  
  // NOTE - the ClassWizard will add and remove member functions here. Z'E@sc 9  
  // DO NOT EDIT what you see in these blocks of generated code ! 9iUw7-)  
  //}}AFX_MSG S}<(9@]z  
  DECLARE_MESSAGE_MAP() Q]\x O/  
}; 'EQAG' YV  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); fN9hBC@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^U1;5+2G+~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {)+/w"^.  
BOOL InitHotkey(); >z2 {D7  
BOOL UnInit(); -v:Y\=[\  
#endif *m7e>]-  
l!1bmg#]$  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. UCQL~  
#include "stdafx.h" ,AJd2ix  
#include "hook.h" @U}UCG7+  
#include <windowsx.h> ny}?+&K  
#ifdef _DEBUG wG B'c's*  
#define new DEBUG_NEW WrV|<%EQh  
#undef THIS_FILE )S]c'}^  
static char THIS_FILE[] = __FILE__; [4gv_g  
#endif Gfvz%%>l  
#define MAX_KEY 100 L.5GX 29  
#define CTRLBIT 0x04 c;WS !.  
#define ALTBIT 0x02 w v1R ]3}  
#define SHIFTBIT 0x01 =y<Fz*aA  
#pragma data_seg("shareddata") !j(R _wOq  
HHOOK hHook =NULL; _ &T$0SZco  
UINT nHookCount =0; ;,<s'5icyg  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey B::vOg77  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ,yC~{ H  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey "/q6E  
static int KeyCount =0; wL{Qni3A  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 4B |f}7%\  
#pragma data_seg() )_BteLo-  
HINSTANCE hins; + 7Z%N9  
void VerifyWindow(); NIgt"o[I  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) giPyo"SD  
//{{AFX_MSG_MAP(CHookApp) SXhJz=h  
// NOTE - the ClassWizard will add and remove mapping macros here. v K$W)(Z  
// DO NOT EDIT what you see in these blocks of generated code! ^t| %!r G  
//}}AFX_MSG_MAP cD 1p5U  
END_MESSAGE_MAP() !({[^[!  
WA<~M) rb  
CHookApp::CHookApp() 4)`{ L$  
{ F/&&VSv>LO  
 // TODO: add construction code here, I?1^\s#L  
 // Place all significant initialization in InitInstance *2 [r?!  
} \d6A<(!=v  
{BF$N#7  
CHookApp theApp; u}pLO9V"`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) D=3NI  
{ (|WqOwmoUt  
 BOOL bProcessed=FALSE; 8.vD]hO  
 if(HC_ACTION==nCode) ^*ZO@GNL  
 { uQ{M<%K  
  if((lParam&0xc0000000)==0xc0000000){// Key up J^u{7K,  
   switch(wParam) H.YntFtD'  
   { [[Z*n/tr  
    case VK_MENU: Z*k}I{0,-  
     MaskBits&=~ALTBIT; J~~WV<6  
     break; >BiJ/[9  
    case VK_CONTROL: 5nk]{ G> V  
     MaskBits&=~CTRLBIT; H#f FU  
     break; \E n^Vf  
    case VK_SHIFT: RxAZ<8T_  
     MaskBits&=~SHIFTBIT; $:>K-4X\}  
     break; ZN. #g_  
    default: //judge the key and send message rx%lL  
     break; +] FdgmK:  
   } ?@tp1?)  
   for(int index=0;index<MAX_KEY;index++){ V-VR+Ndz  
    if(hCallWnd[index]==NULL) }4$UlTA'  
     continue; .}^m8PP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vzfWPjpKW  
    { l{kum2DT  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Obbjl@]  
     bProcessed=TRUE; \h:$q E7  
    } UF?qL1w  
   } Nl0*"}`I_  
  } DRal{?CH  
  else if((lParam&0xc000ffff)==1){ //Key down gVb;sk^  
   switch(wParam) 9OX&;O+5  
   { O}2;>eH  
    case VK_MENU: }LOAT$]XI  
     MaskBits|=ALTBIT; ?v6xa Vg:  
     break; V4_ZBeWA  
    case VK_CONTROL: E-CZk_K9  
     MaskBits|=CTRLBIT; <"6 }C)G  
     break; [V =O$X_  
    case VK_SHIFT: p?ICZg:  
     MaskBits|=SHIFTBIT; L,BuzU[1S  
     break; GP1b/n3F1  
    default: //judge the key and send message }DoNp[`  
     break; L_Z>*s&  
   } ?8pRRzV$  
   for(int index=0;index<MAX_KEY;index++) K;Fy&p^d  
   { L)kwMk  
    if(hCallWnd[index]==NULL) ?nE<Aig  
     continue; u`g|u:(r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) | X! d*4  
    { nzU^G)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ]e!9{\X,*  
     bProcessed=TRUE; 4/cUd=>Z  
    } %R."  
   } \Gg6&:Ua  
  } 6VW&An[6r  
  if(!bProcessed){ Ub3^Js!b%  
   for(int index=0;index<MAX_KEY;index++){  `i;f  
    if(hCallWnd[index]==NULL) <8~bb- U$  
     continue; 8do-z"-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) eX>x +]l6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); U8 '}(  
   } TF2'-"2Y  
  } (*F/^4p!$  
 } oUoDj'JN{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ve<D[jQsk  
} rjz$~(&m6  
}Dp/K4  
BOOL InitHotkey() )k$ +T%  
{ V_^p?Fi #  
 if(hHook!=NULL){ 4YMX;W  
  nHookCount++; N 8 n`f  
  return TRUE; ^O}`i  
 } o-c.D=~  
 else ?`8jn$W^  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 8(]*J8/wt  
  if(hHook!=NULL) E0G"B' x  
   nHookCount++; _e:c 22T'  
  return (hHook!=NULL); 4J{6Wt";  
} R `  
BOOL UnInit() vL}e1V:  
{ br`cxgZ0"  
 if(nHookCount>1){ ~qT5F)$B-  
  nHookCount--;  b"iPuN!p  
  return TRUE; DxoW,G W  
 } GKIO@!@[  
 BOOL unhooked = UnhookWindowsHookEx(hHook); U4M}E h8  
 if(unhooked==TRUE){ >cJfD9-<h  
  nHookCount=0; p?PK8GL  
  hHook=NULL; vnc- W3N  
 } it77x3Mm F  
 return unhooked; c&X2k\  
} mQUI9  
2!QQypQ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /-s-W<S[  
{ Lh\ 1L  
 BOOL bAdded=FALSE; m9M#)<@*  
 for(int index=0;index<MAX_KEY;index++){ P:KS*lOp  
  if(hCallWnd[index]==0){ 4MUN1/DId`  
   hCallWnd[index]=hWnd; ~HBQQt  
   HotKey[index]=cKey; VUmf;~  
   HotKeyMask[index]=cMask; cao=O \Y7  
   bAdded=TRUE; %?2y2O ,;  
   KeyCount++; FLUvFD  
   break; ~xCv_u^=  
  } 2+s#5K&i  
 } owQSy9Az  
 return bAdded; zi%Ql|zI~  
} 9lqH  
jzvrJ14  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5v5)vv.kd  
{ Vq$8!#~w  
 BOOL bRemoved=FALSE; Q ?xA))0  
 for(int index=0;index<MAX_KEY;index++){ [3D*DyQt  
  if(hCallWnd[index]==hWnd){ M47t(9krV  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ lWPh2k  
    hCallWnd[index]=NULL; ~ kwS`  
    HotKey[index]=0; }iIZA>eF  
    HotKeyMask[index]=0; C2 4"H|D  
    bRemoved=TRUE; 'Y2ImSWj  
    KeyCount--; )[wB:kG  
    break; z|bAZKSRYx  
   } /:B2-4>Q!  
  } /Vdu|k=  
 } k~Z;S QyN  
 return bRemoved; "o)jB~ :L  
} cY]BtJ#  
u4x>gRz)  
void VerifyWindow() Q%r KKOX8  
{ Y]VLouzl  
 for(int i=0;i<MAX_KEY;i++){ @B \$ me  
  if(hCallWnd!=NULL){ L%;fYi;n  
   if(!IsWindow(hCallWnd)){ 45Hbg  
    hCallWnd=NULL; q\Q'9Rl0(  
    HotKey=0; 7K5 tBUNQ  
    HotKeyMask=0; `NySTd)\  
    KeyCount--; V!\'7-[R  
   } InA=ty]"_U  
  } |W*#N8I P  
 } ?`T Q'#P`  
} mR O@ZY;5  
"*< )pnJ  
BOOL CHookApp::InitInstance() G,!{Q''w  
{ G ,e!!J  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); (1e,9!?  
 hins=AfxGetInstanceHandle(); O!se-h5mW8  
 InitHotkey(); @)XR  
 return CWinApp::InitInstance(); Tm\a%Z`U>  
} 8'qq!WR~  
U3u j`Oq  
int CHookApp::ExitInstance() y**YFQ*sc  
{ 7bk`u'0%  
 VerifyWindow(); HSR,moI  
 UnInit(); \AeM=K6q+D  
 return CWinApp::ExitInstance(); NK\0X5##.  
} i&^]qL|J  
AO]k*N,N  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file w?V;ItcL  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Fe1XczB  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !?)aZ |r  
#if _MSC_VER > 1000 I;Pd}A_}=_  
#pragma once yXQ 28A  
#endif // _MSC_VER > 1000 6t=)1T  
.WLwAL  
class CCaptureDlg : public CDialog u-M Td  
{ )=nB32~J"  
 // Construction b$q~(Z}  
 public: ZZ>F ^t  
  BOOL bTray; %6\L^RP  
  BOOL bRegistered; 4&AGVplgF  
  BOOL RegisterHotkey(); > -,$  
  UCHAR cKey; {4{X`$  
  UCHAR cMask; vM?,#:5  
  void DeleteIcon(); <ivq}(%72  
  void AddIcon(); v]\T&w%9  
  UINT nCount; ioBYxbY`  
  void SaveBmp(); CHyT'RT  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 3tW}a`z9  
  // Dialog Data ivg W[]  
  //{{AFX_DATA(CCaptureDlg) 3aw-fuuIb  
  enum { IDD = IDD_CAPTURE_DIALOG }; 9^7z"*@#  
  CComboBox m_Key; yMEI^,0"  
  BOOL m_bControl; WC Y5F  
  BOOL m_bAlt; T 9FGuit9  
  BOOL m_bShift; 2y IDyo  
  CString m_Path; ;o158H$gz;  
  CString m_Number; [>LO'}%  
  //}}AFX_DATA &r+!rL Kp  
  // ClassWizard generated virtual function overrides iD.p KG  
  //{{AFX_VIRTUAL(CCaptureDlg) cx[[K.  
 public: i0u`J  
  virtual BOOL PreTranslateMessage(MSG* pMsg); RdB,;Um9f  
 protected: 5?A<('2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `(r0+Qx  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); yU>ucuF  
  //}}AFX_VIRTUAL +~EnrrT+W  
  // Implementation ;6$W-W _  
 protected: uSJLIb  
  HICON m_hIcon; =gC% =  
  // Generated message map functions 1 F&}e&}c  
  //{{AFX_MSG(CCaptureDlg) H2'djZ  
  virtual BOOL OnInitDialog(); $F1Am%  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); +7{8T{  
  afx_msg void OnPaint(); oT|:gih5  
  afx_msg HCURSOR OnQueryDragIcon(); @~&|BvK% \  
  virtual void OnCancel(); 1:RK~_E  
  afx_msg void OnAbout(); tr58J% Mu  
  afx_msg void OnBrowse(); \!"3yd  
  afx_msg void OnChange(); Wo  Z@  
 //}}AFX_MSG 5S[:;o  
 DECLARE_MESSAGE_MAP() x \I uM  
}; kZ;Y/DH  
#endif IOa@dUh7a,  
Wj8WT)cB  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Gzp*Vr  
#include "stdafx.h" v%kl*K`*  
#include "Capture.h" }zIWagC6  
#include "CaptureDlg.h" )Y`ybADd3  
#include <windowsx.h> /]?e^akA  
#pragma comment(lib,"hook.lib") i|0!yID0@  
#ifdef _DEBUG ju!V1ky  
#define new DEBUG_NEW G.r =fNP  
#undef THIS_FILE 411z -aS  
static char THIS_FILE[] = __FILE__; IH`7ou{  
#endif !C(PfsrR/  
#define IDM_SHELL WM_USER+1 7X8*7'.2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #7"";"{ z|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qT01@Bku  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ?4#  
class CAboutDlg : public CDialog :;;k+Sw3  
{ a^Z=xlJ/uZ  
 public: %!DTq`F  
  CAboutDlg(); e0]#vqdO  
  // Dialog Data JLj b'Bn  
  //{{AFX_DATA(CAboutDlg) (,tL(:c  
  enum { IDD = IDD_ABOUTBOX }; Xy}>O*  
  //}}AFX_DATA qC-4X"y+  
  // ClassWizard generated virtual function overrides {L \TO,  
  //{{AFX_VIRTUAL(CAboutDlg)  4&%E?_M  
 protected: 36Lf8~d4"h  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support W.59Al'  
  //}}AFX_VIRTUAL (1[Z#y[  
  // Implementation lR/Uboyy  
 protected: XtE O)  
  //{{AFX_MSG(CAboutDlg) {b-SK5%]L  
  //}}AFX_MSG nkz<t   
  DECLARE_MESSAGE_MAP() xVrLoAw  
}; |WNI[49  
F$'po#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) KO/#t~  
{ 6\Tq,I7  
 //{{AFX_DATA_INIT(CAboutDlg) @V&HE:P  
 //}}AFX_DATA_INIT _Ea1;dJmq  
} IpM"k)HR  
)NTpb  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) iVo-z#  
{ eep/96G ?  
 CDialog::DoDataExchange(pDX); %TO&  
 //{{AFX_DATA_MAP(CAboutDlg) VF+g+~  
 //}}AFX_DATA_MAP UGvUU<N|N  
} NZlCn:"  
[!Djs![O  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) -0I&dG-  
 //{{AFX_MSG_MAP(CAboutDlg) b!`6s  
 // No message handlers 1@}<CWE9  
 //}}AFX_MSG_MAP ftQ;$@  
END_MESSAGE_MAP() HG)$ W  
'Hgk$Im+  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) /`t}5U>S_  
: CDialog(CCaptureDlg::IDD, pParent) S_^;#=_c  
{ =iB$4d2  
 //{{AFX_DATA_INIT(CCaptureDlg) ;Zc0imYL  
  m_bControl = FALSE; qxcTY|&  
  m_bAlt = FALSE; N8,g~?r^  
  m_bShift = FALSE; "Z~@"JLb%  
  m_Path = _T("c:\\"); 1(Z+n,Hh  
  m_Number = _T("0 picture captured."); F=PBEaX  
  nCount=0; QIdml*Np?H  
  bRegistered=FALSE; %$bhg&}  
  bTray=FALSE; Ft}nG&D  
 //}}AFX_DATA_INIT ,zdK%V}  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 @:@5BCs<  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); CYsLyk  
} %s;5  
s2F[v:|Wq  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) o5YL_=7m  
{ ||fCY+x*8  
 CDialog::DoDataExchange(pDX); >>M7#hmt  
 //{{AFX_DATA_MAP(CCaptureDlg) ,s 6lB0  
  DDX_Control(pDX, IDC_KEY, m_Key); B,` `2\B  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); N7GZ'-t^Er  
  DDX_Check(pDX, IDC_ALT, m_bAlt); zm_8{Rta}  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 7mn&w$MS4:  
  DDX_Text(pDX, IDC_PATH, m_Path); Y1F%-o  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 7W+{U0 2O  
 //}}AFX_DATA_MAP TkIiO>  
} uz:r'+v  
b?2 \j}  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ezhfKt]j  
//{{AFX_MSG_MAP(CCaptureDlg) 'R#MH  
 ON_WM_SYSCOMMAND() UMMGT6s,E8  
 ON_WM_PAINT() uH7!)LE#  
 ON_WM_QUERYDRAGICON() vg1E@rH|}  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) O7od2fV(i7  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) T hVq5  
 ON_BN_CLICKED(ID_CHANGE, OnChange) u Tdz$Nh  
//}}AFX_MSG_MAP 2_Zn?#G8dl  
END_MESSAGE_MAP() Zrew}0  
#miG"2ea..  
BOOL CCaptureDlg::OnInitDialog() BqavI&1=  
{ AmUH]+5KT  
 CDialog::OnInitDialog(); MM&qLAa"f  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); M+)ENv e  
 ASSERT(IDM_ABOUTBOX < 0xF000); 'b6qEU#  
 CMenu* pSysMenu = GetSystemMenu(FALSE); I9nm$,i]7  
 if (pSysMenu != NULL) \K lY8\c[  
 { +x?8\  
  CString strAboutMenu; };'~@%U]/  
  strAboutMenu.LoadString(IDS_ABOUTBOX); .R#<Q  
  if (!strAboutMenu.IsEmpty()) kt7Emb}  
  { aU#r`D@0  
   pSysMenu->AppendMenu(MF_SEPARATOR); !, sQB_09C  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 'oM=ZU8wo  
  } ,,g: x  
 } m!(dk]  
 SetIcon(m_hIcon, TRUE); // Set big icon &#9HV  
 SetIcon(m_hIcon, FALSE); // Set small icon )Ofwfypc  
 m_Key.SetCurSel(0); DZ:$p.  
 RegisterHotkey(); +S1h~@c:B  
 CMenu* pMenu=GetSystemMenu(FALSE); 3GMrdG?Y  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 76u\# {5  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); dV^ck+  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); zQB1C  
 return TRUE; // return TRUE unless you set the focus to a control oHF,k  
} 4F!%mMq  
<2LUq@Pg  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) > lI2r}  
{ /8,cF7XL*  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ^a|  
 { 0&3zBL%Bo  
  CAboutDlg dlgAbout; :#UA!| nV  
  dlgAbout.DoModal(); M?DXCsZ,)s  
 } $_|jI ^  
 else BDX>J3h  
 { UI wTf2B  
  CDialog::OnSysCommand(nID, lParam); /<J5?H  
 } (m')dSZ  
} 3g0v,7,Zv  
YdYaLTz  
void CCaptureDlg::OnPaint() qy-Hv6oof  
{ %4/X;w\3  
 if (IsIconic()) g}BS:#$  
 { }!WuJz"  
  CPaintDC dc(this); // device context for painting (%fSJCBl[P  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); `0=j,54cx  
  // Center icon in client rectangle N*KM6j  
  int cxIcon = GetSystemMetrics(SM_CXICON); /1hcw|cfC  
  int cyIcon = GetSystemMetrics(SM_CYICON); BtQqUk#L2  
  CRect rect; L f;Uv[^c  
  GetClientRect(&rect); |9)y<}c5oM  
  int x = (rect.Width() - cxIcon + 1) / 2; _1jeaV9@  
  int y = (rect.Height() - cyIcon + 1) / 2; K~qKr<)  
  // Draw the icon @Dd(  
  dc.DrawIcon(x, y, m_hIcon); n ,@ ge  
 } l HZ4N{n  
 else -(E-yC u  
 { 1V]j8  
  CDialog::OnPaint(); 9 vNz yh\  
 } o<g1;  
} Wa iM\h?=#  
ZCDXy  
HCURSOR CCaptureDlg::OnQueryDragIcon() cejD(!MKe  
{ "Fxw"I <  
 return (HCURSOR) m_hIcon; H$,wg!kY!  
} ^>s{o5H&  
1Nz#,IdQ  
void CCaptureDlg::OnCancel() $ \ I|6[P  
{ i>=y3x"  
 if(bTray) C1-Jj_XQ.  
  DeleteIcon(); nd h\+7  
  CDialog::OnCancel(); u}jC$T>2%6  
} |+1k7S  ,  
I.1(qbPkF+  
void CCaptureDlg::OnAbout() @[;$R@M_3  
{ OuB [[L  
 CAboutDlg dlg; 0}\8,U  
 dlg.DoModal(); De49!{\a  
} FuP~_ E~  
= Fwzm^}6  
void CCaptureDlg::OnBrowse() $-n_$jLY  
{ jZ?^ |1  
 CString str; e?e oy|  
 BROWSEINFO bi; tSiQr I  
 char name[MAX_PATH]; ?1H>k<Jp  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); jG,^~ 5x  
 bi.hwndOwner=GetSafeHwnd(); K` <`l  
 bi.pszDisplayName=name; -B:O0;f  
 bi.lpszTitle="Select folder"; p8z"Jn2P  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ho6,&Bp8  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); k-$J #  
 if(idl==NULL) _D1)_?`a@-  
  return; oXGP6#  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ,"T[#A~  
 str.ReleaseBuffer(); ^C{?LH/2  
 m_Path=str; 9}11>X  
 if(str.GetAt(str.GetLength()-1)!='\\') 6/|"y  
  m_Path+="\\"; 0"u=g)3  
 UpdateData(FALSE); -n6T^vf  
} `^DP<&{  
bE"J&;|  
void CCaptureDlg::SaveBmp() 5pq9x4&  
{ '>% c@C[  
 CDC dc; l i2/"~l  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); "IoY$!Hk  
 CBitmap bm; p5bM/{DP;K  
 int Width=GetSystemMetrics(SM_CXSCREEN); $# b  
 int Height=GetSystemMetrics(SM_CYSCREEN); ,.,Y{CP  
 bm.CreateCompatibleBitmap(&dc,Width,Height); V V Aw y6  
 CDC tdc; 9<*<-x{A17  
 tdc.CreateCompatibleDC(&dc); 2*0n#" L  
 CBitmap*pOld=tdc.SelectObject(&bm); OJ}aN>k  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); mtNB09E(  
 tdc.SelectObject(pOld); 62>/0_m5  
 BITMAP btm; L$}'6y/@  
 bm.GetBitmap(&btm); oRl@AhS  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; @Hst-H.l<l  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); +/Vzw  
 BITMAPINFOHEADER bih; BWsD~Ft  
 bih.biBitCount=btm.bmBitsPixel; bpfSe  
 bih.biClrImportant=0; @C5 %`{\  
 bih.biClrUsed=0; 4,ewp coC%  
 bih.biCompression=0; g)iw.M2  
 bih.biHeight=btm.bmHeight; zfUkHL6  
 bih.biPlanes=1; xf8.PqVNo  
 bih.biSize=sizeof(BITMAPINFOHEADER); rB3b  
 bih.biSizeImage=size; B zr}+J  
 bih.biWidth=btm.bmWidth; &sS]h|2Z5  
 bih.biXPelsPerMeter=0; Y\{lQMCy  
 bih.biYPelsPerMeter=0; 7 6S>xnN  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); rXnG"A  
 static int filecount=0; GC~N$!*  
 CString name; +Z%8X!Q  
 name.Format("pict%04d.bmp",filecount++); t Ow[  
 name=m_Path+name; 90+Hv:wF  
 BITMAPFILEHEADER bfh; Jv:|J DZ'  
 bfh.bfReserved1=bfh.bfReserved2=0; t($z+ C<  
 bfh.bfType=((WORD)('M'<< 8)|'B'); U,nQnD"!t&  
 bfh.bfSize=54+size; BC1P3Sk 6X  
 bfh.bfOffBits=54; %(kf#[zQ  
 CFile bf; K#plSD^f=  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ B4;P)\ 2  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 5>M@ F0  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); p9iCrqi  
  bf.WriteHuge(lpData,size); _ 4+=S)$  
  bf.Close(); ]Oe[;<I  
  nCount++; m{0u+obi&w  
 } "yxBD 7  
 GlobalFreePtr(lpData); e irRAU  
 if(nCount==1) c# WIB 4  
  m_Number.Format("%d picture captured.",nCount); )hK1W\5  
 else s B!2't  
  m_Number.Format("%d pictures captured.",nCount); *wJ'Z4_5F  
  UpdateData(FALSE); wGA%h.[M|  
} eR5+1b  
nB86oQ/S  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) & A@ !g  
{ m{sch`bP  
 if(pMsg -> message == WM_KEYDOWN) =_H)5I_\  
 { .#ATI<t  
  if(pMsg -> wParam == VK_ESCAPE) *wfkjG  
   return TRUE; ak;S Ie  
  if(pMsg -> wParam == VK_RETURN) .;~K*GC  
   return TRUE; |)u|@\{  
 } ]ch=D  
 return CDialog::PreTranslateMessage(pMsg); W[j7Vi8v  
} 0B~Q.tyP  
@7<m.?A!  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >eaK@u-'0  
{ JZrUl^8E  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ =6+j Po{F  
  SaveBmp(); N_>}UhZ  
  return FALSE; XvW $B|  
} 7q:  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ NbW5a3=  
 CMenu pop; <(-4?"1  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 9 !qVYU42(  
 CMenu*pMenu=pop.GetSubMenu(0); a fhZM$  
 pMenu->SetDefaultItem(ID_EXITICON); "Q<*H<e  
 CPoint pt; 6u v'{  
 GetCursorPos(&pt); &g-uQBQI#  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); $Uxg$pqO  
 if(id==ID_EXITICON) ,@*`2I>`  
  DeleteIcon(); WP0{%  
 else if(id==ID_EXIT) H0i\#)Xs  
  OnCancel(); oM#S.f?  
 return FALSE; ^7~w yAr  
} MOW {g\{\  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); wH[}@w  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) - dt<w;>W  
 AddIcon(); :7Q, `W9  
 return res; |qsY0zx  
} o] 7U;W  
?YbZVoD)J  
void CCaptureDlg::AddIcon() *npe]cC  
{ A?8 29<  
 NOTIFYICONDATA data; Gk5SG_o  
 data.cbSize=sizeof(NOTIFYICONDATA); &g<`i{_  
 CString tip; r#[YBaCZJ  
 tip.LoadString(IDS_ICONTIP); OHha5n  
 data.hIcon=GetIcon(0); 0,`$KbV\  
 data.hWnd=GetSafeHwnd(); D?"TcA  
 strcpy(data.szTip,tip); }~28UXb23  
 data.uCallbackMessage=IDM_SHELL; >xE{& ):  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ~cEr <mzR  
 data.uID=98; >K;'dB/m;1  
 Shell_NotifyIcon(NIM_ADD,&data); kpN'H_ .  
 ShowWindow(SW_HIDE); .U !;fJ9  
 bTray=TRUE; 3 e9fziQ~  
} SbW6O_   
ba   
void CCaptureDlg::DeleteIcon() d\ Z#XzI8  
{ &Wup 7  
 NOTIFYICONDATA data; ZVek`Cc2  
 data.cbSize=sizeof(NOTIFYICONDATA); (_lc< Bj  
 data.hWnd=GetSafeHwnd(); 'u2Qq"d+  
 data.uID=98; Sm%MoFf  
 Shell_NotifyIcon(NIM_DELETE,&data); ?k:i3$  
 ShowWindow(SW_SHOW); QYL ';  
 SetForegroundWindow(); BOp&s>hI  
 ShowWindow(SW_SHOWNORMAL); LvNk:99:<  
 bTray=FALSE; 8Cr?0Z  
} q}["Nww-  
jTx,5s-  
void CCaptureDlg::OnChange() ZWJFd(6  
{  Dk fw*Oo  
 RegisterHotkey(); lFY;O !Y5\  
} f V.(v&  
wFaWLC|&  
BOOL CCaptureDlg::RegisterHotkey() O({-lI  
{ :Y[r^=>  
 UpdateData(); ~U~4QQV  
 UCHAR mask=0; ?%HtPm2< %  
 UCHAR key=0; qEpP%p  
 if(m_bControl) R%Yws2Le2  
  mask|=4; d0 tN73(  
 if(m_bAlt) ;G3{ e  
  mask|=2; `v)-v<  
 if(m_bShift) J)n g,i  
  mask|=1; a|\_'#  
  key=Key_Table[m_Key.GetCurSel()]; ~>)GW  
 if(bRegistered){ \0pJ+@\T9  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); WiL~b =fT  
  bRegistered=FALSE; P + nT%  
 } O,[aL;v  
 cMask=mask; U9xFQ=$ 2  
 cKey=key; @]HV:7<q  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); JqH2c=}-  
 return bRegistered; OX4+1@$tk  
} EQ>bwEG  
*R>I%?]V3  
  四、小结 * #;rp~  
!`='K +  
  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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