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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: Kl aZZJ  
  4P4 Fo1  
  一、实现方法 Q$fRi[/L  
*TM;trfz  
  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: ksu}+i,a  
'6o`^u>  
#pragma data_seg("shareddata") hEv=T'*,K)  
HHOOK hHook =NULL; //钩子句柄 CP]S-o}yd  
UINT nHookCount =0; //挂接的程序数目 k'@7ZH  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 z;y^t4 ^9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 YXX36  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey J+71FP`ZH  
static int KeyCount =0; &SjHrOG?  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 .|-l+   
#pragma data_seg() hg?j)jl|  
<}EV*`w4  
  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。 so!w!O@@  
1tc]rC4h  
  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: h6\3vfj^f  
<'}b*wUB  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR p<=(GY-  
cKey,UCHAR cMask) v@fe-T&0  
{ O}K_l1  
 BOOL bAdded=FALSE; -t@y\vZF,  
 for(int index=0;index<MAX_KEY;index++){ b W=.K>|  
  if(hCallWnd[index]==0){ 3!.H^v?  
   hCallWnd[index]=hWnd; ':4}O#  
   HotKey[index]=cKey; +}7Ea:K   
   HotKeyMask[index]=cMask; >bfYy=/  
   bAdded=TRUE; RIy5ww}3|  
   KeyCount++; s&dO/}3uR]  
   break; 'dIX=/RZ  
  } &Y54QE".  
 } F l_dzh,E  
 return bAdded; sK`~Csb iB  
} n#+%!HTh  
//删除热键 )-+\M_JK5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) j3x^<a\gJ  
{ <%d51~@={I  
 BOOL bRemoved=FALSE; gDQkn {T.%  
 for(int index=0;index<MAX_KEY;index++){ .D8~)ZWN  
  if(hCallWnd[index]==hWnd){ aO.\Qe+j  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ w4e%-Ln  
    hCallWnd[index]=NULL; bA@ /B'  
    HotKey[index]=0; H96BqNoO  
    HotKeyMask[index]=0; V~(EVF{h  
    bRemoved=TRUE; Gn bfy4Z  
    KeyCount--; < /;Q8;0  
    break; V$/u  
   } qQfqlD<  
  } Sl3KpZ  
 } [3O^0-:6E  
 return bRemoved; $ Wit17j  
} r]A" Og_U  
}P<Qz^sr_  
1~}m.ER  
  DLL中的钩子函数如下: yZYK wKG  
Ps U9R#HL1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) R K"&l!o  
{ UL86-R!  
 BOOL bProcessed=FALSE; '[Mlmgc5  
 if(HC_ACTION==nCode) #yW.o'S+  
 { YfE>Pn'r  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 $[Tt#CJ w  
   switch(wParam) zRwb"  
   {  `]*%:NZP@  
    case VK_MENU: t)-*.qZh  
     MaskBits&=~ALTBIT; (k%GY< bP  
     break; W8w3~  
    case VK_CONTROL: ry.;u*F  
     MaskBits&=~CTRLBIT; +>JdYV<?0  
     break; 9$Ig~W)  
    case VK_SHIFT: 0:Ar| to$m  
     MaskBits&=~SHIFTBIT; ;% 2wGT  
     break; Ho 3dsh)  
    default: //judge the key and send message duX0Mc. 0P  
     break; F-_%>KJS  
   } ;wJ~haC  
   for(int index=0;index<MAX_KEY;index++){ $o]r ]#B+  
    if(hCallWnd[index]==NULL) CY34X2F  
     continue; ^vJ"-{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W7H&R,  
    { P @zz"~f7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); U?gl"6x  
     bProcessed=TRUE; tbtI1"$  
    } C>.e+V+':  
   } 9 |' |BC  
  } >; aCf#q  
  else if((lParam&0xc000ffff)==1){ //有键按下 i.3cj1  
   switch(wParam) #@9)h  
   { G+0><,S  
    case VK_MENU: 9]"S:{KSCn  
     MaskBits|=ALTBIT; /\na;GI$  
     break; M70c{s`w5  
    case VK_CONTROL: l0I}&,+  
     MaskBits|=CTRLBIT; vt//)*(.$  
     break; ujU=JlJ7dl  
    case VK_SHIFT: K&*iw`  
     MaskBits|=SHIFTBIT; z9[[C^C  
     break; YRPm^kW  
    default: //judge the key and send message {@?G 9UypA  
     break; Ck: 9gn  
   } Rj^7#,993  
   for(int index=0;index<MAX_KEY;index++){ / /'Tck  
    if(hCallWnd[index]==NULL) :z]}ZZ  
     continue; ?AEd(_a!q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) MhNFW'_  
    { j`O7=-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); }.p<wCPy6  
     bProcessed=TRUE; + :Vrip  
    } /D<"wF }@J  
   } OA[&Za#w  
  } P}0*{%jB  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 'l~6ErBSg  
   for(int index=0;index<MAX_KEY;index++){ oh6B3>>+  
    if(hCallWnd[index]==NULL) :- ?Ct  
     continue; qz9tr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Mi ; glm  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); wJ gX/W  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 n-$VUo  
   } -D^L}b  
  } EFAGP${F  
 } SyO79e*t  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); h{k_6ym  
} 'n0 .#E_  
d6`OXTD  
  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: 3\AM=`  
4[TR0bM%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9Y/L?km_(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [*)Z!)  
ZPHXzi3j  
  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: {XgnZ`*  
5o#Yt  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) FW8-'~  
{ h>alGLN>  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Rs*v m  
 { $<|ocUC7  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 V >Hf9sZ  
  SaveBmp(); ;#TaZN  
  return FALSE; [$\z'}  
 } \?DR s  
 …… //其它处理及默认处理 t|V0x3X  
} T$KF< =  
C)Jn[/BD  
k;I  &.H  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 EATu KLP\  
3$VxRz)  
  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。 JqCc;Cbd  
!"Q}R p  
  二、编程步骤 w%dL 8k  
[3N[i(Wlk  
  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"; Ri#H.T<'  
B@O@1?c[  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; at6149B\)  
#`;/KNp 9  
  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; WZZ4]cC  
1zftrX~v!X  
  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; -Xz&}QA  
5l DFp9  
  5、 添加代码,编译运行程序。 RKZ6}q1n  
x0Yse:RE^  
三、程序代码 S[,8TErz  
|.P/:e9  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL  Fl3#D7K  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) WKmbNvN^  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ W0XF~  
#if _MSC_VER > 1000 Xf d*D  
#pragma once 9!U@"~yB  
#endif // _MSC_VER > 1000 -?6MU~"GK  
#ifndef __AFXWIN_H__ p'n4)I2#  
#error include 'stdafx.h' before including this file for PCH 4v'A\~ZU  
#endif ^V3v{>D>  
#include "resource.h" // main symbols ^j)BKD-  
class CHookApp : public CWinApp K93p"nHN  
{ ]"~51HQZ  
 public: ZH,4oF  
  CHookApp(); w$|l{VI  
  // Overrides dQb.BOI)h  
  // ClassWizard generated virtual function overrides N ]N4^A'  
  //{{AFX_VIRTUAL(CHookApp) Nt:9MG>1  
 public: @}s$]i$|-  
  virtual BOOL InitInstance(); 6rN(_Oi-  
  virtual int ExitInstance(); B[5r|d'  
  //}}AFX_VIRTUAL CO?Xt+1hR  
  //{{AFX_MSG(CHookApp) Y+~g\z-]c  
  // NOTE - the ClassWizard will add and remove member functions here. x9W(cKB'S  
  // DO NOT EDIT what you see in these blocks of generated code ! %XTcP2pRJ  
  //}}AFX_MSG 2Y!S_Hw8  
  DECLARE_MESSAGE_MAP() ?!VIS>C(  
}; {HOy_Fiih  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 3WY$WRv  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2F`cv1M  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =gh`JN6  
BOOL InitHotkey(); N_Akmh0D  
BOOL UnInit(); <spZ! #o  
#endif J;$N{"M  
wsU V;S*X%  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. [5$w=u"j  
#include "stdafx.h" S8, Z;y  
#include "hook.h" P u0uKE  
#include <windowsx.h> LjB;;&VCn  
#ifdef _DEBUG 8Q{9>^  
#define new DEBUG_NEW ;z~n.0'  
#undef THIS_FILE >q~l21dUi  
static char THIS_FILE[] = __FILE__; ,Gk}"w  
#endif =*vMA#e  
#define MAX_KEY 100 2[fN\e{  
#define CTRLBIT 0x04 MZJ]Dwt]  
#define ALTBIT 0x02 HO)/dZNU  
#define SHIFTBIT 0x01 p&-'|'![l  
#pragma data_seg("shareddata") 'R<&d}@P*#  
HHOOK hHook =NULL; f:B>zp;N  
UINT nHookCount =0; ;Lm=dd@S:  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 5kNzv~4B,;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT X^9d/}uTa  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey fq[;%cr4  
static int KeyCount =0; +>~?m*$  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift  Ez~'^s@  
#pragma data_seg() \dQx+f&t  
HINSTANCE hins; RP5+d  
void VerifyWindow(); G~7 i@Zs  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) J[~5U~F  
//{{AFX_MSG_MAP(CHookApp) <"D=6jqZ  
// NOTE - the ClassWizard will add and remove mapping macros here. ] b9-k  
// DO NOT EDIT what you see in these blocks of generated code! aVL=K  
//}}AFX_MSG_MAP %M|,b!eF  
END_MESSAGE_MAP() !2UOC P  
3bZIYF2@  
CHookApp::CHookApp() `+:.L>5([  
{ !HeSOzN  
 // TODO: add construction code here, ^u}L;`L  
 // Place all significant initialization in InitInstance /walu+]h  
} _p-t<ytnh  
!\8  ;d8  
CHookApp theApp; wkqX^i7ls  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %1 vsN-O}8  
{ NLPkh,T:  
 BOOL bProcessed=FALSE; <GHYt#GIZ+  
 if(HC_ACTION==nCode) 5]I|DHmu  
 { v:Tzv^  
  if((lParam&0xc0000000)==0xc0000000){// Key up [.hyZ}B  
   switch(wParam) +YLejjQ  
   { ZOXIT(mg  
    case VK_MENU: /&F,V+x  
     MaskBits&=~ALTBIT; 'Jf^`ZT}  
     break; !zj0/Q G\  
    case VK_CONTROL: pD]0`L-HJU  
     MaskBits&=~CTRLBIT; 0;4t&v7  
     break; Y HSYu  
    case VK_SHIFT: "8^5>EJWv  
     MaskBits&=~SHIFTBIT; u]u[(K5F  
     break; o&AM2U/?  
    default: //judge the key and send message ac kqH+'  
     break; dVB~Smsr  
   } "s!7dKXI"  
   for(int index=0;index<MAX_KEY;index++){ kr$ b^"Ku  
    if(hCallWnd[index]==NULL) #P]#9Ty:  
     continue; D`J6h,=2l/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J_Ltuso  
    { #ET/ =  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); LK6; ? m  
     bProcessed=TRUE; A;\ 7|'4  
    } Q#h 9n]5  
   } %AOja+  
  } I$E.s*B9  
  else if((lParam&0xc000ffff)==1){ //Key down ~%?`P/.o  
   switch(wParam) ]EwVpvTw  
   { |-V&O=!^+  
    case VK_MENU: J psPNa  
     MaskBits|=ALTBIT; 7eWk7&Xul  
     break; Mu'8;9_6  
    case VK_CONTROL: pdJ/&ufh  
     MaskBits|=CTRLBIT; VJ ^dY;  
     break; $zB[B;-!$  
    case VK_SHIFT: h/B>S  
     MaskBits|=SHIFTBIT; D]c`B  
     break; .9md~j:o^s  
    default: //judge the key and send message yQ#:J9HMJ  
     break; ={LMdC~5X  
   } #Z6'?p9  
   for(int index=0;index<MAX_KEY;index++) L?5Ck<!xG  
   { ^c:Fy+fb  
    if(hCallWnd[index]==NULL) meN2ZB?Y  
     continue; Z|%_oR~b|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z]b>VpW:  
    { |t; ~:A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); *tm0R>?!  
     bProcessed=TRUE; JXyM\}9-X  
    } Ag F,aZU  
   } JQ4{` =,b  
  } r$]HIvJD  
  if(!bProcessed){ dnV[ P  
   for(int index=0;index<MAX_KEY;index++){ 1hcjSO  
    if(hCallWnd[index]==NULL) ?wnzTbJN  
     continue; hXqD<?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) V& C/Z}\  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); v3v[[96p  
   } uV 7BK+[O  
  } GnP|x}YM  
 } Q#nOJ(KV  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,V*%V;  
} R+&jD;U{  
!Hys3AP  
BOOL InitHotkey() x\Z'2?u}  
{ t3dlS`O  
 if(hHook!=NULL){ TLoz)&@  
  nHookCount++; $Y5)(  
  return TRUE; Gs3LB/8?  
 } :n /@z4#  
 else |&Ym@Jyj  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 6252N]*  
  if(hHook!=NULL) f4L`.~b'hb  
   nHookCount++; TEDAb >  
  return (hHook!=NULL); rj6#1kt  
} O(+phRwJ  
BOOL UnInit() }:Z#}8  
{ H,N)4;F<c  
 if(nHookCount>1){ wm+/e#'&  
  nHookCount--; ?_I[,N?@41  
  return TRUE; NJNJjdD>  
 } J!:SPQ  
 BOOL unhooked = UnhookWindowsHookEx(hHook); bQ~j=\[r  
 if(unhooked==TRUE){ ,=l7:n  
  nHookCount=0; tU_y6  
  hHook=NULL; 0{#8',*}m?  
 } ezPz<iZ\N  
 return unhooked; 26xXl|I  
} /="~gq@  
{dmj/6Lc  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^5=B`aich  
{ xhRngHU\z<  
 BOOL bAdded=FALSE; To?W?s  
 for(int index=0;index<MAX_KEY;index++){ bT&: fHc  
  if(hCallWnd[index]==0){ b$Vz2Fzx  
   hCallWnd[index]=hWnd; /% N r?V  
   HotKey[index]=cKey; EY \H=@A  
   HotKeyMask[index]=cMask; ;\p KDPr  
   bAdded=TRUE; H"qOSf{  
   KeyCount++; @-+Q# Zz`  
   break; _1U1(^)  
  } 8=]Tr3   
 } R58-wUto  
 return bAdded; n_'s=]~  
} ;pnD0bH  
ij?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) IEU^#=n  
{ C:Hoq(  
 BOOL bRemoved=FALSE; Zfyo-Wk  
 for(int index=0;index<MAX_KEY;index++){ qG<$Ajiin  
  if(hCallWnd[index]==hWnd){ &gjF4~W]  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ qbv#I;  
    hCallWnd[index]=NULL; q `pP$i:  
    HotKey[index]=0; 4Z/f@ZD  
    HotKeyMask[index]=0; YX` 7Hm,  
    bRemoved=TRUE; P{u0ftyX}  
    KeyCount--; '3?\K3S4i  
    break; 6H'HxB4  
   } / z}~zO  
  } 6C-z=s)P&  
 } Ox@sI:CT  
 return bRemoved; 1bH;!J  
} JJ%ePgWT  
X$yN_7|+  
void VerifyWindow() 3"O>&Q0c  
{ U4cY_p?  
 for(int i=0;i<MAX_KEY;i++){ z@wMc EH  
  if(hCallWnd!=NULL){ hEw- O;T0  
   if(!IsWindow(hCallWnd)){ og0*Nt+  
    hCallWnd=NULL; *W kIq>  
    HotKey=0; f"St&q>[s  
    HotKeyMask=0; O)"gS!,  
    KeyCount--; aJcf`<p   
   } 95z]9UL  
  } ca>Z7qT!  
 } 0X^Ke(/89  
} ;g~TWy^o  
v{A KEX*  
BOOL CHookApp::InitInstance() /IsS;0K%L  
{ i@4~.iZ8  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ?2oHZ%G  
 hins=AfxGetInstanceHandle(); E <c9#I=  
 InitHotkey(); HcqfB NM  
 return CWinApp::InitInstance(); L =8rH5  
} g>J<%z, }2  
0lv %`,  
int CHookApp::ExitInstance() AGbhJ=tB  
{ >$ e9igwe  
 VerifyWindow(); C?2' +K  
 UnInit(); $_x^lr  
 return CWinApp::ExitInstance(); Jm42b4  
} bP^Je&nS*  
NM06QzE  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ZfB " E  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) YJo["Q  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ E>}4$q[r  
#if _MSC_VER > 1000 t1%_DPD%W  
#pragma once qs QNjt  
#endif // _MSC_VER > 1000 +Xemf?  
OD5m9XS  
class CCaptureDlg : public CDialog DS'n  
{ ~}+Hgi  
 // Construction -UD\;D?$  
 public: qv@$ZLR  
  BOOL bTray; M{*Lp6h  
  BOOL bRegistered; |gU(s  
  BOOL RegisterHotkey(); `+uhy ,  
  UCHAR cKey; ma((2My'H  
  UCHAR cMask; B:+6~&,-  
  void DeleteIcon(); O/<K!;(@?  
  void AddIcon(); rW0FA  
  UINT nCount; B4mR9HMh  
  void SaveBmp(); B~_d^`  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ~SnSEhE  
  // Dialog Data 7bV{Q355P  
  //{{AFX_DATA(CCaptureDlg) /;utcc  
  enum { IDD = IDD_CAPTURE_DIALOG }; a(0*um(  
  CComboBox m_Key; smry2*g  
  BOOL m_bControl; iURk=*Z=  
  BOOL m_bAlt; Ck!VV2U#  
  BOOL m_bShift; +*hm-lv?  
  CString m_Path; :Cp'm'omb  
  CString m_Number; /=gOa\k|p  
  //}}AFX_DATA 2^l[(N  
  // ClassWizard generated virtual function overrides G^` 1]?  
  //{{AFX_VIRTUAL(CCaptureDlg) -]t,E,(!  
 public: ~>+]%FPv  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 4A2?Uhp y  
 protected: YE9,KVV;$n  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dtc IC0:[  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 6#QK%[1!>  
  //}}AFX_VIRTUAL Qu]z)";7  
  // Implementation 4'LB7}WG  
 protected: mD/MJt5  
  HICON m_hIcon; 7Ddaf>  
  // Generated message map functions FGh] S-A  
  //{{AFX_MSG(CCaptureDlg) H `(exa:w  
  virtual BOOL OnInitDialog();  $O dCL  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); E,f>1meN=  
  afx_msg void OnPaint(); p^'3Odd|O  
  afx_msg HCURSOR OnQueryDragIcon(); PgRDKygE  
  virtual void OnCancel(); &T}''  
  afx_msg void OnAbout(); Y14W?|KOB  
  afx_msg void OnBrowse(); H(&4[%;MP  
  afx_msg void OnChange(); T9879[ZU\  
 //}}AFX_MSG >G~R,{6U  
 DECLARE_MESSAGE_MAP() f`&dQ,;  
}; [ U w i  
#endif ryFxn|4  
DmOyBtj  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 'GL*u#h  
#include "stdafx.h" U8G%YGMG.4  
#include "Capture.h" `ck$t5:6sp  
#include "CaptureDlg.h" ,Uy|5zv  
#include <windowsx.h> j7)Ao*WN  
#pragma comment(lib,"hook.lib") b&5lYp"d  
#ifdef _DEBUG $O*O/ iG  
#define new DEBUG_NEW xQp|;oW;z  
#undef THIS_FILE T N!=@Gy  
static char THIS_FILE[] = __FILE__; ^*fxR]Y  
#endif lf!FTm7  
#define IDM_SHELL WM_USER+1 /0eYMG+K=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); rQaxr!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W[}s o6  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};  &CG*)bE  
class CAboutDlg : public CDialog vVgg0Y2  
{ e@ \p0(  
 public: XB_B4X1R  
  CAboutDlg(); Jzp#bgq}|  
  // Dialog Data HX6Ma{vBk  
  //{{AFX_DATA(CAboutDlg) &|`C)6[C  
  enum { IDD = IDD_ABOUTBOX }; G2^et$<{uU  
  //}}AFX_DATA 4NdN< #Lr  
  // ClassWizard generated virtual function overrides jr3ti>,xV  
  //{{AFX_VIRTUAL(CAboutDlg) w/IZDMBf|  
 protected: Vo"RO$%ow*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +|ycvHd  
  //}}AFX_VIRTUAL _BDK`D  
  // Implementation +tD[9b! m  
 protected: hsw9(D>jp  
  //{{AFX_MSG(CAboutDlg) e A}%C.ZR  
  //}}AFX_MSG O1`9Y}G(r  
  DECLARE_MESSAGE_MAP() ?Sb8@S&J  
}; "hdvHUz  
zH*KYB  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) %zO h  
{ ]J#9\4Sq  
 //{{AFX_DATA_INIT(CAboutDlg) &RTX6%'KY  
 //}}AFX_DATA_INIT z1Ov|Q`  
} ~D|5u\D-  
mSo_} je(  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ;IpT} ,  
{ pm6>_Kz  
 CDialog::DoDataExchange(pDX); (X?/"lC)  
 //{{AFX_DATA_MAP(CAboutDlg) q`G,L(  
 //}}AFX_DATA_MAP P06R JE  
} ?]4>rl}  
=dx1/4bZl|  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) !XzF67  
 //{{AFX_MSG_MAP(CAboutDlg) > z^#  
 // No message handlers HdLH2+|P;D  
 //}}AFX_MSG_MAP <2nZ&M4/s{  
END_MESSAGE_MAP() 2 6>ZW4Z  
U. @*`Fg  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?SC[G-b  
: CDialog(CCaptureDlg::IDD, pParent) Hp(D);0+)  
{ o^V(U~m]  
 //{{AFX_DATA_INIT(CCaptureDlg) LB.co4  
  m_bControl = FALSE; EFc-foN  
  m_bAlt = FALSE; g9Yz*Nee<  
  m_bShift = FALSE; f +hjC  
  m_Path = _T("c:\\"); <u=4*:QE  
  m_Number = _T("0 picture captured."); "C*B,D*}:  
  nCount=0; w` DW(hXJ  
  bRegistered=FALSE; bUY>st'  
  bTray=FALSE; `w.AQ?p@  
 //}}AFX_DATA_INIT {Ixg2=E\  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 SKW%X8  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); L-9~uM3@\  
} ys#i@  
E.iSWAJ(w  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 2>l,no39t+  
{ ZoB {x*IH  
 CDialog::DoDataExchange(pDX); nA~E "*  
 //{{AFX_DATA_MAP(CCaptureDlg) U bYEEY#  
  DDX_Control(pDX, IDC_KEY, m_Key); NxLXm,  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); /CIh2 ]#e  
  DDX_Check(pDX, IDC_ALT, m_bAlt); XhPe]P  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); g%k`  
  DDX_Text(pDX, IDC_PATH, m_Path); fkSwD(  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ILic.@st  
 //}}AFX_DATA_MAP GAc{l=vT'  
} 0W%@gs5d&  
@p|$/Z%R,  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) F]I=+T   
//{{AFX_MSG_MAP(CCaptureDlg) $.:mai  
 ON_WM_SYSCOMMAND() W k}AmC  
 ON_WM_PAINT() )=DGdI Et  
 ON_WM_QUERYDRAGICON() Z,X'-7YkU  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) -`Y :~q1  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) \-*eL;qP  
 ON_BN_CLICKED(ID_CHANGE, OnChange) O MX-_\")  
//}}AFX_MSG_MAP nL?oTze*p  
END_MESSAGE_MAP() H-p;6C<  
K)_WL]RJ.4  
BOOL CCaptureDlg::OnInitDialog() 9V.u-^o&  
{ \`w4|T  
 CDialog::OnInitDialog(); u(!&:A9JFd  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); oW;6h.  
 ASSERT(IDM_ABOUTBOX < 0xF000); @WKzX41'  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 99EXo+g  
 if (pSysMenu != NULL) [0UGuj  
 { eVl'\aUd  
  CString strAboutMenu; J4YBqp  
  strAboutMenu.LoadString(IDS_ABOUTBOX); RJeSi`19T)  
  if (!strAboutMenu.IsEmpty()) T,_(?YJW  
  { /(8a~f&%r  
   pSysMenu->AppendMenu(MF_SEPARATOR); Krs2Gre}  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Y+qQIMZ  
  } tW;:-  
 } }Up.){.%  
 SetIcon(m_hIcon, TRUE); // Set big icon  LZ~"VV^  
 SetIcon(m_hIcon, FALSE); // Set small icon &Z^ l=YH,  
 m_Key.SetCurSel(0); tV/Z)fpyH  
 RegisterHotkey(); IooNb:(  
 CMenu* pMenu=GetSystemMenu(FALSE); n& $^04+i  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); !JBae2Z  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); {5|("0[F  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); )J(q49  
 return TRUE; // return TRUE unless you set the focus to a control .4l/_4,s_  
} #Z~C`n u  
%5\3Aw  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [= "r<W0  
{ Hk7K`9  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) -]:G L>b  
 { 7'N S9|  
  CAboutDlg dlgAbout; [\Qr. 2  
  dlgAbout.DoModal(); cubUq5  
 } _#_ E^!  
 else ~LQ[4h<J !  
 { ; "3+YTtp  
  CDialog::OnSysCommand(nID, lParam); ~ np,_yI  
 } nNmsr=y5  
} =IKEb#R/  
>`jU`bR@  
void CCaptureDlg::OnPaint() H UWxPIu  
{ gf)t)-E  
 if (IsIconic()) j 6ut}Uq  
 { B%\gkl  
  CPaintDC dc(this); // device context for painting 5HS~op2n/  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); q*)+K9LRk  
  // Center icon in client rectangle rbqo"g`  
  int cxIcon = GetSystemMetrics(SM_CXICON); ,LOQDIyn  
  int cyIcon = GetSystemMetrics(SM_CYICON); N]YtLa,t  
  CRect rect; Jg$xO@.  
  GetClientRect(&rect); kVS?RHR  
  int x = (rect.Width() - cxIcon + 1) / 2; Ov82ibp_1  
  int y = (rect.Height() - cyIcon + 1) / 2; #2xSyOrmf  
  // Draw the icon Rb}KZ+o "Z  
  dc.DrawIcon(x, y, m_hIcon); <a le$[  
 } j*;N\;iL!*  
 else EN !?:RV  
 { !8tS|C#2  
  CDialog::OnPaint(); insY(.N  
 } +[ .Yy  
} x6'^4y])  
q1k{  
HCURSOR CCaptureDlg::OnQueryDragIcon() G&f7+e  
{ lnbmoHv  
 return (HCURSOR) m_hIcon; $A<ESfrs  
} AK u_~bTk  
)fU(AXSP  
void CCaptureDlg::OnCancel() kD.pzx EM  
{ v$w++3H  
 if(bTray) #Tp]^ n  
  DeleteIcon(); Cpx+qQt0  
  CDialog::OnCancel(); m|svQ-/j  
} R,@g7p  
?HHzQ4w%{  
void CCaptureDlg::OnAbout() 'q%%m/,VPQ  
{ Ps R>V)L  
 CAboutDlg dlg; Cef:tdk7  
 dlg.DoModal(); 8rbG*6  
} ;Pb8YvG1$  
K \Eo z]?  
void CCaptureDlg::OnBrowse() <Mf*l)%*  
{ b*,3< 9  
 CString str; >[a<pm !  
 BROWSEINFO bi; 'i>xf ^  
 char name[MAX_PATH]; CL7Nr@  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ~0-g%C?R  
 bi.hwndOwner=GetSafeHwnd(); ?q91:H   
 bi.pszDisplayName=name; vi {uy  
 bi.lpszTitle="Select folder"; CV.+P-  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; _`a&9i &  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); .gYt0raSY  
 if(idl==NULL) '5H4z7)  
  return; K3p@$3hQ  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); +3^NaY`Y  
 str.ReleaseBuffer(); M2T|"Q"=  
 m_Path=str; [B6DC`M  
 if(str.GetAt(str.GetLength()-1)!='\\') qs=tJ ^<<o  
  m_Path+="\\"; (B`sQw@tu  
 UpdateData(FALSE); Qu~*46?0  
} 2Ji+{,?,  
E(L<L1:"  
void CCaptureDlg::SaveBmp() Ttv9" z  
{ ;rBp1[qVe  
 CDC dc; 5JFV%odo  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); :%-,Fxl4  
 CBitmap bm; oO=o|w|T  
 int Width=GetSystemMetrics(SM_CXSCREEN); 7!2 HNg  
 int Height=GetSystemMetrics(SM_CYSCREEN); BgRZ<B`  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 3x5!a5$Y  
 CDC tdc; %AR^+*Nu  
 tdc.CreateCompatibleDC(&dc); E8/rZ~0O~  
 CBitmap*pOld=tdc.SelectObject(&bm); ehOs9b  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ^b53}f8H  
 tdc.SelectObject(pOld); xFsmf<Vm  
 BITMAP btm; $3\yf?m}q  
 bm.GetBitmap(&btm); [!?wyv3  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; T{S4|G1R6  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); QB 77:E  
 BITMAPINFOHEADER bih; t=dO  
 bih.biBitCount=btm.bmBitsPixel; `mB.pz[  
 bih.biClrImportant=0;  wRVD_?  
 bih.biClrUsed=0; 7U:=~7GH  
 bih.biCompression=0; ?q%b*Ek  
 bih.biHeight=btm.bmHeight; C+l?k2  
 bih.biPlanes=1; -i_En^Fi  
 bih.biSize=sizeof(BITMAPINFOHEADER); ~b8a^6:R"  
 bih.biSizeImage=size; %2yAvGa1  
 bih.biWidth=btm.bmWidth; &=-PRza%j  
 bih.biXPelsPerMeter=0; x N`T  
 bih.biYPelsPerMeter=0; $A?}a  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); En5!"w|j  
 static int filecount=0; Bxv8RB  
 CString name; *bZ\@Qm  
 name.Format("pict%04d.bmp",filecount++); F1}  
 name=m_Path+name; 'TX M{RGw  
 BITMAPFILEHEADER bfh; .xpmp6-  
 bfh.bfReserved1=bfh.bfReserved2=0; dt ~iw  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ]P*!'iYN(  
 bfh.bfSize=54+size; 97x%w]kV  
 bfh.bfOffBits=54; @}eNV~ROu  
 CFile bf; R$xY8+}V  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 2z-$zB<vyw  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ]p$zvMf}  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); \GHOg.P  
  bf.WriteHuge(lpData,size); ~ hD{coVTI  
  bf.Close(); C ktX0  
  nCount++; .;slrg(5F  
 } Ed=}PrE  
 GlobalFreePtr(lpData); & s-VSu7  
 if(nCount==1) 'rx?hL3VW  
  m_Number.Format("%d picture captured.",nCount); 8vJdf9pB*  
 else m"-G6BKS  
  m_Number.Format("%d pictures captured.",nCount); :r39wFi  
  UpdateData(FALSE); I*c;hfu  
} BkT-m'I?  
(C~dkR?  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) (rMZ  
{ 2f`xHI/@fj  
 if(pMsg -> message == WM_KEYDOWN) KnFQ)sX^  
 { 73pC  
  if(pMsg -> wParam == VK_ESCAPE) yfq>,  
   return TRUE; yjeL9:jH[  
  if(pMsg -> wParam == VK_RETURN) q u:To7  
   return TRUE; %Qd3BZ  
 } ;fx1!:;.  
 return CDialog::PreTranslateMessage(pMsg); ]Wy.R6  
} _ _ =s'  
Ps7_-cH  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @Mr}6x*  
{ 5Jw"{V?Ak  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ `5<1EGJsD  
  SaveBmp(); %1Jd ^[W  
  return FALSE; #Gp M22d'(  
} TF)8qHy! u  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Zsk?QS FE  
 CMenu pop; +3HPA#A  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Gt5$6>A  
 CMenu*pMenu=pop.GetSubMenu(0); @tQ2E}psP,  
 pMenu->SetDefaultItem(ID_EXITICON); e/P4mc)  
 CPoint pt; CKN8z  
 GetCursorPos(&pt); )rbc;{.  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); .$^wy3:F"  
 if(id==ID_EXITICON) CLktNR(45  
  DeleteIcon(); ?w8p LE~E  
 else if(id==ID_EXIT) um}N%5GAa  
  OnCancel(); 4 4<v9uSK  
 return FALSE; _r7=&oL.Q  
} @e={Wy+Vm(  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); fOJj(0=y  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) x cnt?%%M  
 AddIcon(); [>wzl"cHW  
 return res; Pzptr%{  
} W60Q3  
x{2o[dK4}  
void CCaptureDlg::AddIcon() iBS0rT_  
{ 1>yha j(K  
 NOTIFYICONDATA data; taixBNv  
 data.cbSize=sizeof(NOTIFYICONDATA); Z]p8IH%~92  
 CString tip; -sx-7LKi  
 tip.LoadString(IDS_ICONTIP); VlV)$z_  
 data.hIcon=GetIcon(0); excrXx  
 data.hWnd=GetSafeHwnd(); :SQ LfOQ  
 strcpy(data.szTip,tip); L-MiaKcL  
 data.uCallbackMessage=IDM_SHELL; pr)K{~m]{<  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; #a.\P.{L  
 data.uID=98; Kf&r21h  
 Shell_NotifyIcon(NIM_ADD,&data); S8vx[<  
 ShowWindow(SW_HIDE); p/4S$ j#Tn  
 bTray=TRUE; ,?fN#gc :  
} rQ &S<  
FQQ@kP$.  
void CCaptureDlg::DeleteIcon() `TAcZl=8  
{ 6l<1A$BQ  
 NOTIFYICONDATA data; I=K[SY,]9  
 data.cbSize=sizeof(NOTIFYICONDATA); {QW-g  
 data.hWnd=GetSafeHwnd(); i@Vs4E[b  
 data.uID=98; U* 4{"  
 Shell_NotifyIcon(NIM_DELETE,&data); &1 oaZY w  
 ShowWindow(SW_SHOW); o;*]1  
 SetForegroundWindow(); z,M'Tr.1|  
 ShowWindow(SW_SHOWNORMAL); n~9 i^  
 bTray=FALSE; GPMrs)J*!  
} 2h5tBEOX.s  
\!m!ibr  
void CCaptureDlg::OnChange() ,v|CombIc.  
{ 5nY9Ls(e  
 RegisterHotkey(); CN-4-  
} H kSL5@  
kRQ~hRT6  
BOOL CCaptureDlg::RegisterHotkey() xa' nJ"f;  
{ 9y;y7i{>?  
 UpdateData(); xp~YIeSg  
 UCHAR mask=0; i+U@\:=  
 UCHAR key=0; Ko@zk<~"[  
 if(m_bControl) +tPx0>p;  
  mask|=4; ofVEao  
 if(m_bAlt) 8g-P_[>  
  mask|=2; dG" K/|  
 if(m_bShift) $R8>u#K!  
  mask|=1; <&KLo>B^  
  key=Key_Table[m_Key.GetCurSel()]; /cM 5  
 if(bRegistered){ ^zKt{a  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); lGl[^ 0  
  bRegistered=FALSE; (21']x  
 } zUNH8=U  
 cMask=mask; 10/x'#(  
 cKey=key; _s2m-jm7  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); { ( _B  
 return bRegistered; H\ {E%7^h-  
} fm[_@L% x  
<g] ou YHZ  
  四、小结 +}kO ;\  
oo;;y,`8py  
  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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