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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: lHPnAaue@  
  nf[KD,f  
  一、实现方法 97<Z,q72Y  
epG]$T![  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: 1]Cb i7  
xFJT&=Af W  
#pragma data_seg("shareddata") wWSw0 H/  
HHOOK hHook =NULL; //钩子句柄 a8v\H8@X  
UINT nHookCount =0; //挂接的程序数目 >rSCf=  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 C1(RgY|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 & P%#  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ,izp^,`  
static int KeyCount =0; Z op/ MeI  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 4^k8| # c  
#pragma data_seg() Dx=RLiU9  
)2 q r^)  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 s&+`>  
q(WGvl^r  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: tOte[~,  
|eg8F$WU  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR xi4b;U j  
cKey,UCHAR cMask) G$)tp^%]  
{ [O}D^qp  
 BOOL bAdded=FALSE; .:4*HB  
 for(int index=0;index<MAX_KEY;index++){ I+ 3qu=  
  if(hCallWnd[index]==0){ 6xY6EC  
   hCallWnd[index]=hWnd; }eI9me@Aa  
   HotKey[index]=cKey; @P>>:002/  
   HotKeyMask[index]=cMask; 8G2QI4  
   bAdded=TRUE; B5h)F> &G  
   KeyCount++; `sy_'`i>X  
   break; L_|iQwU%  
  } f`K#=_Kq7  
 } `:R9M+ OX  
 return bAdded; ,_/\pX0  
} O2yD{i#l*#  
//删除热键 wDSwcNS  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) NPFI^Uj#A  
{ NH:Bdl3  
 BOOL bRemoved=FALSE; LOu9#w"  
 for(int index=0;index<MAX_KEY;index++){ qT:`F  
  if(hCallWnd[index]==hWnd){ +?*.Emzl@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ J5O/c,?g  
    hCallWnd[index]=NULL; Hw toa,  
    HotKey[index]=0; |/c-~|%  
    HotKeyMask[index]=0; C-@M|K9A'  
    bRemoved=TRUE; @[`]w`9Q7  
    KeyCount--; XbeT x  
    break; h,-i\8gq  
   } #Ye0*`  
  } pIug$Ke_%  
 } H;@0L}Nu+}  
 return bRemoved; gNZ"Kr o6  
} `Fe/=]< $  
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K6)IBV;  
  DLL中的钩子函数如下: I>w|80%%  
[} d39  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) lPC{R k.\C  
{ WX`wz>KK^  
 BOOL bProcessed=FALSE; %&lwp  
 if(HC_ACTION==nCode) QNv5CQ&  
 { PI9aKNt  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 wr(*RI"  
   switch(wParam) =h?%<2t9<  
   {  C OL"/3r  
    case VK_MENU: +z#+}'mT%  
     MaskBits&=~ALTBIT; *lu*h&Y  
     break; O*N:.|dUw  
    case VK_CONTROL: 1W-kZ(e  
     MaskBits&=~CTRLBIT; Lpnw(r9Y  
     break; 0B2f[A  
    case VK_SHIFT: "4T36b  
     MaskBits&=~SHIFTBIT; s<:) ;-tL  
     break; 33a}M;vx  
    default: //judge the key and send message y5D3zqCG  
     break; JDp=w,7LF  
   } gxe u2 HG  
   for(int index=0;index<MAX_KEY;index++){ nE0I[T(  
    if(hCallWnd[index]==NULL) :uqEGnEut  
     continue; - K"L6m|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6/p9ag]  
    { M?<iQxtyb}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .:B0(4Mj  
     bProcessed=TRUE; a3z_o)"   
    } J-G)mvkv  
   } cg_tJ^vrY  
  } ^vzXT>t-M  
  else if((lParam&0xc000ffff)==1){ //有键按下 Y{@foIZ  
   switch(wParam) 6Bd:R}yZP7  
   { Uxe]T  
    case VK_MENU: }dqOE-"I"n  
     MaskBits|=ALTBIT; }N,v&  B  
     break; C.H(aX)7  
    case VK_CONTROL: *+2BZ ZwT  
     MaskBits|=CTRLBIT; W'E3_dj+  
     break; BvHI}=  
    case VK_SHIFT: -- IewW  
     MaskBits|=SHIFTBIT; :9q|<[Y^  
     break; AT2D+Hi=E  
    default: //judge the key and send message xa !/.  
     break; B[f:T%  
   } ?i!d00X  
   for(int index=0;index<MAX_KEY;index++){ >>;He7  
    if(hCallWnd[index]==NULL) >m=XqtP  
     continue; JuRWR0@`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) An,TunX  
    { .Rb1%1bdc  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,wHlU-%  
     bProcessed=TRUE; =BV_ ?  
    } bIk4?S  
   } M?n}{0E4  
  } =NPo<^Lae  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 h ^w# I  
   for(int index=0;index<MAX_KEY;index++){ S3QX{5t\  
    if(hCallWnd[index]==NULL) BHNJH  
     continue; O-~cj7 0\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) MRK3Cey}%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); w2`JFxQ^x  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 62[_u]<Yub  
   } 6pZ/C<Y|W  
  } G!Y7Rj WD  
 } O\@0o|NM  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); r-[YJzf@P  
} 9):^[Wkx  
'k<~HQr  
  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: Z%SDN"+'g  
YPw=iF]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); nA=E|$1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v|jwz.jM  
3XUsw1,[  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: wNh\pWA  
 .g=D70  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =;?Maexp3$  
{ x51xY$M  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) H4M`^r@)'  
 { )M56vyo  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 aLQ]2m  
  SaveBmp(); sE^= ]N  
  return FALSE; u 1Wixjd|  
 } H~0B5Hl!F  
 …… //其它处理及默认处理 t-]~^s  
} gA2]kZg  
)Oj{x0{\Q  
SK,UW6h  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ,twm)%caU  
=}F$r5]  
  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。 qx?0]!x  
Bv6~!p  
  二、编程步骤 """eU,"  
S9qc34\^=  
  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"; 9; aOUs:<  
>[P`$XkXd4  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; `mN5sq  
>kDkvg1"  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ;4`%?6%  
sB'~=1m^  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; QKt{XB6Y  
Cg^1(dBd[9  
  5、 添加代码,编译运行程序。 KM-7w66V  
XIp>PcU^  
三、程序代码 pJ@->V_  
^VjF W  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL -TNb=2en(  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) [>:9 #n  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ #[~f 6s9D  
#if _MSC_VER > 1000 }SS~uQ;8  
#pragma once ,mt=)Ac  
#endif // _MSC_VER > 1000 "Y=4Y;5q  
#ifndef __AFXWIN_H__ Z.U8d(  
#error include 'stdafx.h' before including this file for PCH  ;W@  
#endif !q^2| %  
#include "resource.h" // main symbols -&np/tEu&  
class CHookApp : public CWinApp ;7mE%1X  
{ ]%h|ox0  
 public: fZxEE~Q1  
  CHookApp(); H4ancmy  
  // Overrides K|rG&#1J  
  // ClassWizard generated virtual function overrides 7x(z  
  //{{AFX_VIRTUAL(CHookApp) 0?'v|5}  
 public: /f!ze|  
  virtual BOOL InitInstance(); R]TS5b-  
  virtual int ExitInstance(); ?!n0N\|i]  
  //}}AFX_VIRTUAL NH8\&#}nAK  
  //{{AFX_MSG(CHookApp) 9?+?V}o  
  // NOTE - the ClassWizard will add and remove member functions here. Sfffm$H  
  // DO NOT EDIT what you see in these blocks of generated code ! "!PN+gB  
  //}}AFX_MSG QG;V\2T2[  
  DECLARE_MESSAGE_MAP() aByd,uSe)_  
}; R!RgQwEak  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ;0O>$|kg  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); nSbcq>3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _Xfn  
BOOL InitHotkey(); h09fU5l  
BOOL UnInit(); S&Sa~Oq<o  
#endif 0JV|wd8j  
,4S6F HK  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. '2S?4Z  
#include "stdafx.h" p</V_BIW  
#include "hook.h" Uc]sWcR  
#include <windowsx.h> `& ]H`KNa  
#ifdef _DEBUG Y;>D"C..  
#define new DEBUG_NEW j55OG~)  
#undef THIS_FILE o/I`L  
static char THIS_FILE[] = __FILE__; *|3G"B{w6  
#endif w(!COu  
#define MAX_KEY 100 tP|ox]  
#define CTRLBIT 0x04 Xm~N Bt  
#define ALTBIT 0x02 %j;mDR9 5  
#define SHIFTBIT 0x01 K,f- w2!  
#pragma data_seg("shareddata") SG-Xgr@  
HHOOK hHook =NULL; h`V#)Q  
UINT nHookCount =0; RhSoD.Da  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey [?Vk wFD0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT =_vW7-H  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey M}N[> ,2'  
static int KeyCount =0; 3;wOA4ur  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift bA(-7l?  
#pragma data_seg() Q=F4ZrNqD  
HINSTANCE hins; ^wb$wtL('  
void VerifyWindow(); Q>l5:2lq  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) G"F:68  
//{{AFX_MSG_MAP(CHookApp) &z;1Z  
// NOTE - the ClassWizard will add and remove mapping macros here. }x?2txuu  
// DO NOT EDIT what you see in these blocks of generated code! =~'{2gsB  
//}}AFX_MSG_MAP A=\:b^\  
END_MESSAGE_MAP() C dTE~O<)  
}+GIrEDId  
CHookApp::CHookApp() n]v,cfn/=<  
{ *ZV=4[#bT  
 // TODO: add construction code here, xC-&<s  
 // Place all significant initialization in InitInstance _{y4N0  
} "Rr650w[  
'E kuCL  
CHookApp theApp; vQ1#Zg y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :lp V  
{ V})b.\"F  
 BOOL bProcessed=FALSE; `fq#W#Pu  
 if(HC_ACTION==nCode) 1YvE/<6  
 { L(_bf/ @3  
  if((lParam&0xc0000000)==0xc0000000){// Key up ZRj&k9D^U  
   switch(wParam) Pfl8x  
   { XjU/7Q  
    case VK_MENU: ^,6c9Dxy  
     MaskBits&=~ALTBIT; }"6 PM)s  
     break; +YCKd3/  
    case VK_CONTROL: oaM 3#QJ  
     MaskBits&=~CTRLBIT; 1t<  nm)  
     break; |)b:@q3k+n  
    case VK_SHIFT: ;.&k zzvJ  
     MaskBits&=~SHIFTBIT; HkdBPMs79  
     break; ko`.nSZ-k  
    default: //judge the key and send message 'XW9+jj)/  
     break; e>!=)6[*  
   } 2~)r,.,  
   for(int index=0;index<MAX_KEY;index++){ %%hG],w  
    if(hCallWnd[index]==NULL) ]seOc],4  
     continue; ?j@(1",=&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R9)"%SO<y  
    { \'-E[xNcWI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); V8" m_  
     bProcessed=TRUE; ,w$:=;i  
    } 2rG$.cGN"  
   } X.J$ 5b  
  } I|vfxf  
  else if((lParam&0xc000ffff)==1){ //Key down whh#J (  
   switch(wParam) )^LiAL h  
   { KU*XRZu)  
    case VK_MENU: Q;y)6+VU4  
     MaskBits|=ALTBIT; 3u~V&jl  
     break; p{oc}dWin  
    case VK_CONTROL: %SN"<O!  
     MaskBits|=CTRLBIT; tqwAS)v=  
     break; u/(~ew I  
    case VK_SHIFT: &^(4yw(~  
     MaskBits|=SHIFTBIT; 8>a%L?BY  
     break; {P!1VYs5  
    default: //judge the key and send message c^x5 E`{  
     break; @"O|[%7e  
   } ISi^BFU  
   for(int index=0;index<MAX_KEY;index++) ] Wx?k7T  
   { ytyB:# J  
    if(hCallWnd[index]==NULL) agp7zw=N  
     continue; EdC/]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  } @4by<  
    { TWSx9ii!M:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2OsS+6,[x  
     bProcessed=TRUE; !6*m<#Qm  
    } W>y &  
   } ]jgMN7  
  } '))K' u  
  if(!bProcessed){ B2l5}"{ `  
   for(int index=0;index<MAX_KEY;index++){ W*^_Ul|  
    if(hCallWnd[index]==NULL) :'X:cL  
     continue; wL~-k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) u Xo?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); x<\5Jrqt  
   } Df.eb|[{  
  } _o'a|=Osx>  
 } g1&>.V}!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); F-%Hw  
} -SUK [<=X  
aXh~w<5F  
BOOL InitHotkey() )8*}-z  
{ <N,:w`g#  
 if(hHook!=NULL){ L-1#n  
  nHookCount++; uo-1.[9ds  
  return TRUE; eNu]K,rT  
 } c)4L3W-x=  
 else sr-tZ^d5S?  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); e&-MP;kgW9  
  if(hHook!=NULL) Fuy"JmeR  
   nHookCount++; $nr=4'y Z  
  return (hHook!=NULL); vC!B}~RG  
} ^5rB/y,  
BOOL UnInit() =2e{T J/  
{ ~' w]%rh!  
 if(nHookCount>1){ fxknfgbg  
  nHookCount--; UT_kw}1o  
  return TRUE; =buarxk  
 } dheobD  
 BOOL unhooked = UnhookWindowsHookEx(hHook); e5#?@}?  
 if(unhooked==TRUE){ IZ<Et/3H  
  nHookCount=0; @K1'Q!S *  
  hHook=NULL; PC3?eS}  
 } YT}ZLx  
 return unhooked; ToM1#]4  
} V@r V +s  
BKKW3PT  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dF$&fo%  
{ ;e0-FF+  
 BOOL bAdded=FALSE; TGHyBPJb  
 for(int index=0;index<MAX_KEY;index++){ (Rh$0^)A  
  if(hCallWnd[index]==0){ U3~rtc*  
   hCallWnd[index]=hWnd; y 'Ah*h  
   HotKey[index]=cKey; A$70!5*  
   HotKeyMask[index]=cMask; ~- eB  
   bAdded=TRUE; .S*VYt%K7  
   KeyCount++; 3L:SJskYR  
   break; <b-OdOg  
  } w_#C8}2  
 } ca<OG;R^  
 return bAdded; & tjL*/  
} ,0f^>3&n>e  
~rlPS#]o  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lf#5X)V  
{ )zkr[;j~`  
 BOOL bRemoved=FALSE; ~DP5Qi  
 for(int index=0;index<MAX_KEY;index++){ j937tn!Q  
  if(hCallWnd[index]==hWnd){ BvP++,a&Sa  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 'm0_pM1:D  
    hCallWnd[index]=NULL; QL:Qzr[  
    HotKey[index]=0; Ffig0K+ `  
    HotKeyMask[index]=0; p ^ ONJL  
    bRemoved=TRUE; F},kfCFF  
    KeyCount--; `=%G&_3_<  
    break; E+cx 8(   
   } :9f 9Z7M  
  } |h & q  
 } Vg}+w Nt5  
 return bRemoved; v%7Gh -P  
} e!vWGnY  
XZrzG P(  
void VerifyWindow() w|f@sB>j  
{ W&HxMi  
 for(int i=0;i<MAX_KEY;i++){ lib}dk  
  if(hCallWnd!=NULL){ wb ^>/  
   if(!IsWindow(hCallWnd)){ U/ax`_  
    hCallWnd=NULL; ; W$.>*O  
    HotKey=0; Z%JAX>v&B  
    HotKeyMask=0; 9M-W 1prb  
    KeyCount--; 0-p %.}GE  
   } 2 SU  
  } `>=@Kc  
 } :XOjS[wBm  
} J^!wk9q  
vAjog])9s  
BOOL CHookApp::InitInstance() pm2]  
{ 2 ,krVb?<  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); >sQf{uL  
 hins=AfxGetInstanceHandle(); 9{0%M  
 InitHotkey(); %~P3t=r  
 return CWinApp::InitInstance(); eQ,VK`7X  
} oJ|m/i)  
=&PO_t5)z  
int CHookApp::ExitInstance() SeuDJxqopD  
{ &yI>A1  
 VerifyWindow(); 1Se2@WR'  
 UnInit(); j Q8 T  
 return CWinApp::ExitInstance(); u Yc}eMb  
} GK1P7Qy?V  
7Kpv fyL{  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file jI~$iDdOfs  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) KN&|&51p}  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ -s\R2_(  
#if _MSC_VER > 1000 N*\r i0  
#pragma once X9?0`6Li  
#endif // _MSC_VER > 1000 ]Bs{9=2  
3 K q /V_  
class CCaptureDlg : public CDialog dh1 N/[  
{ x6ayFq=  
 // Construction GyV uQ51  
 public: Df$~=A}  
  BOOL bTray; `aA)n;{/2u  
  BOOL bRegistered; (M{>9rk8  
  BOOL RegisterHotkey(); @z:E]O}  
  UCHAR cKey; S+*>""=  
  UCHAR cMask; i~)EU F  
  void DeleteIcon(); 'T7Y5X80$j  
  void AddIcon(); y1[@4TY]  
  UINT nCount; &he:_p$x  
  void SaveBmp(); = J]M#6N0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor FF0~i+5  
  // Dialog Data /SyAjZ  
  //{{AFX_DATA(CCaptureDlg) N#@v`S  
  enum { IDD = IDD_CAPTURE_DIALOG }; 7r2p+LP[  
  CComboBox m_Key; /1uGsE+[  
  BOOL m_bControl; s'OK])>`  
  BOOL m_bAlt; b$- g"F  
  BOOL m_bShift; F!w|5,)  
  CString m_Path; \rE] V,,2  
  CString m_Number; DyA1zwp}  
  //}}AFX_DATA 8k+k\V{  
  // ClassWizard generated virtual function overrides FYb]9MX  
  //{{AFX_VIRTUAL(CCaptureDlg) +;=>&XR0m  
 public: l}k'ZX4  
  virtual BOOL PreTranslateMessage(MSG* pMsg); J|@D @\?7  
 protected: cl |}0Q5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support B?Rkz  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ` k(Q:  
  //}}AFX_VIRTUAL .~TI%&#  
  // Implementation m=Mk@xfQ#  
 protected: *pABdP+  
  HICON m_hIcon; Ndyo)11z  
  // Generated message map functions MBnxF^c&P  
  //{{AFX_MSG(CCaptureDlg) px(~ZZB"  
  virtual BOOL OnInitDialog(); TtQd#mSI\  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); F8M};&=*1r  
  afx_msg void OnPaint(); Wg<o%6`  
  afx_msg HCURSOR OnQueryDragIcon(); %(H' j@D[  
  virtual void OnCancel(); <q Q@OUI   
  afx_msg void OnAbout(); &JD^\+7U:  
  afx_msg void OnBrowse(); JbMp /  
  afx_msg void OnChange(); 25r3[gX9`  
 //}}AFX_MSG > %slzr  
 DECLARE_MESSAGE_MAP() }mI0D >n  
}; Vup|*d2r0E  
#endif zAev@+.ld  
z46Sh&+  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file " RIt  
#include "stdafx.h" oa[O~z{~  
#include "Capture.h" ^+gD;a|t  
#include "CaptureDlg.h" hzpl;Mj  
#include <windowsx.h> 2 zG;91^  
#pragma comment(lib,"hook.lib") m9 ]Ge]  
#ifdef _DEBUG c0w1 N]+Ne  
#define new DEBUG_NEW +Fh,!`  
#undef THIS_FILE zsR5"Vi=  
static char THIS_FILE[] = __FILE__; V 'fri/Z  
#endif D=Yr/qc?  
#define IDM_SHELL WM_USER+1 g_?Q3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 09{s'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _::ssnG3jT  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; "|R75m,Id  
class CAboutDlg : public CDialog L|;sB=$'{  
{ x5rLGt  
 public: ,4B8?0sH|  
  CAboutDlg(); /;!I.|j  
  // Dialog Data AsvH@\\  
  //{{AFX_DATA(CAboutDlg) Md8<IFi9]Q  
  enum { IDD = IDD_ABOUTBOX }; !XM*y  
  //}}AFX_DATA fvV"H{V,  
  // ClassWizard generated virtual function overrides ( )f)  
  //{{AFX_VIRTUAL(CAboutDlg) 6#\:J0  
 protected: -"^xg"  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support sD&V_ &i  
  //}}AFX_VIRTUAL w@n}DCFt  
  // Implementation A5]yC\*zt  
 protected: a`?Vc}&  
  //{{AFX_MSG(CAboutDlg) z2!4w +2  
  //}}AFX_MSG <'7s3  
  DECLARE_MESSAGE_MAP() j *;.>akY7  
}; {) sE;p-  
vo2GFo  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Ttp%U8-LJR  
{ YD{N)v  
 //{{AFX_DATA_INIT(CAboutDlg) ,WM-%2z^4I  
 //}}AFX_DATA_INIT !4 lN[  
} X\i;j!;d  
K8_\U0 K  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) <s$T7Zk  
{ b):aqRwP  
 CDialog::DoDataExchange(pDX); 1?.NJ<)F  
 //{{AFX_DATA_MAP(CAboutDlg) Ww#!-,*]o  
 //}}AFX_DATA_MAP 6UL9+9[C  
} Z)@[N 6\?  
6BM$u v4  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) v (S h+p  
 //{{AFX_MSG_MAP(CAboutDlg) iun_z$I<+Z  
 // No message handlers 7u5H o`  
 //}}AFX_MSG_MAP |Q";a:&$  
END_MESSAGE_MAP() :Gx5vo  
475g-t2"@  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ^!n|j]aw  
: CDialog(CCaptureDlg::IDD, pParent) [X8EfU}  
{ Gi2Fjq/Y  
 //{{AFX_DATA_INIT(CCaptureDlg) T7O)  
  m_bControl = FALSE; \=xS?(v!  
  m_bAlt = FALSE; m&be55M;  
  m_bShift = FALSE; XdOntP*a  
  m_Path = _T("c:\\"); x~{W(;`!  
  m_Number = _T("0 picture captured."); kc}|L9  
  nCount=0; gFfKK`)}D'  
  bRegistered=FALSE; 02T'B&&~  
  bTray=FALSE; 0($On`#  
 //}}AFX_DATA_INIT *~b~y7C  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 vz1I/IdTd  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); wx!2/I>  
} E&U_@ bc-  
d3#e7rQ8  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) nQa:t. rC  
{ &n0Ag]$P  
 CDialog::DoDataExchange(pDX); uss!E!_%,  
 //{{AFX_DATA_MAP(CCaptureDlg) R|wS*xd,  
  DDX_Control(pDX, IDC_KEY, m_Key); h]&~yuI>  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ?.beN[X  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 2k&Voa  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); +V[;DOlll  
  DDX_Text(pDX, IDC_PATH, m_Path); ap"pQ[t;  
  DDX_Text(pDX, IDC_NUMBER, m_Number); F}1._I`-  
 //}}AFX_DATA_MAP &0J8I Cd=  
} uf:'"7V7  
>xsY"N&1i'  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) A* Pz-z>z  
//{{AFX_MSG_MAP(CCaptureDlg) VRSBf;?  
 ON_WM_SYSCOMMAND() &yOl}?u  
 ON_WM_PAINT() ;ZP!:,  
 ON_WM_QUERYDRAGICON() Ae1b`%To  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ltNY8xrdGN  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) E]^n\bE%  
 ON_BN_CLICKED(ID_CHANGE, OnChange) L&uPNcZ`-  
//}}AFX_MSG_MAP [kqO6U  
END_MESSAGE_MAP() fRkx ^u P  
NdX  C8  
BOOL CCaptureDlg::OnInitDialog() B7o US}M  
{ :lmimAMt  
 CDialog::OnInitDialog(); F"3'~ 6  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); :7(d 6gEL  
 ASSERT(IDM_ABOUTBOX < 0xF000); %dhrXK5  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Rz6kwh=q  
 if (pSysMenu != NULL) L%-ENk  
 { B8!$?1*^a  
  CString strAboutMenu; wgq=9\+&  
  strAboutMenu.LoadString(IDS_ABOUTBOX); vu*9(t)EC  
  if (!strAboutMenu.IsEmpty()) ,_=LV  
  { ?`6Mfpvj96  
   pSysMenu->AppendMenu(MF_SEPARATOR); &>K|F >7q  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); IMpL+W.  
  } Ke~!1S8=  
 } ZZfi,0R  
 SetIcon(m_hIcon, TRUE); // Set big icon T| R!Aw.  
 SetIcon(m_hIcon, FALSE); // Set small icon rL?{+S]&^)  
 m_Key.SetCurSel(0); n0%S: (  
 RegisterHotkey(); 3x z z* <  
 CMenu* pMenu=GetSystemMenu(FALSE); `1y@c"t  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); |It{L0=U  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); !d[]Qt%mA  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); rhGB l`(B  
 return TRUE; // return TRUE unless you set the focus to a control t^%)d7$  
} s:z  
_)4zm  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) BIg2`95F|  
{ x@pzgqi3  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) =CCddLO  
 { s5MG#M 9  
  CAboutDlg dlgAbout; 'RNj5r  
  dlgAbout.DoModal(); &lxMVynL  
 } LJt5?zQKrW  
 else 9C5F#(uY  
 { ^W^Y"0y9`  
  CDialog::OnSysCommand(nID, lParam); ?iHcY,  
 } Zu P3/d  
} .v9i|E=<~  
v`:!$U* H=  
void CCaptureDlg::OnPaint() g  b[.Ww  
{ '[HU!8F  
 if (IsIconic()) n:H |=SF{  
 { %z"$?Iv  
  CPaintDC dc(this); // device context for painting *)HVK&'  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); F`+S(APT8  
  // Center icon in client rectangle [DTe  
  int cxIcon = GetSystemMetrics(SM_CXICON); F#qc#s  
  int cyIcon = GetSystemMetrics(SM_CYICON); V gy12dE  
  CRect rect; 7~QAprwVS  
  GetClientRect(&rect); ]2|KG3t  
  int x = (rect.Width() - cxIcon + 1) / 2; /^WawH6)6  
  int y = (rect.Height() - cyIcon + 1) / 2; |>>^Mol  
  // Draw the icon D(e,R9hPU  
  dc.DrawIcon(x, y, m_hIcon); XZ3M~cD q  
 } blaXAqe  
 else h_g "F@  
 { z@jKzyq  
  CDialog::OnPaint(); m}6>F0Kv  
 } "ZmxHMf  
} KQ(S\  
'}F9f?  
HCURSOR CCaptureDlg::OnQueryDragIcon() m]{/5L  
{ ^lK!tOeO  
 return (HCURSOR) m_hIcon; UyF;sw  
} p-7?S^!l  
x'%vL",%  
void CCaptureDlg::OnCancel() X6?Gxf,  
{ yDpv+6(a  
 if(bTray) t6)R 37  
  DeleteIcon(); |;U3pq)  
  CDialog::OnCancel(); a<((\c_8G  
} *;lb<uLv  
xz7CnW1  
void CCaptureDlg::OnAbout() F^=y+}]=  
{ jo0XOs  
 CAboutDlg dlg; /u"Iq8QA  
 dlg.DoModal(); 'w|N} 4  
} f uH3C~u7<  
nGTqW/k[+s  
void CCaptureDlg::OnBrowse() 90H/Txq  
{ ;BHIss7  
 CString str; \z.p [;'ir  
 BROWSEINFO bi; |I.5]r-EK  
 char name[MAX_PATH]; GB6(WAmr  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); -, $:^4  
 bi.hwndOwner=GetSafeHwnd(); oiz]Bd  
 bi.pszDisplayName=name; z34+1d  
 bi.lpszTitle="Select folder"; Z_T~2t  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; /5\{(=0  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); J%E0Wd  
 if(idl==NULL) clIn}wQ  
  return; S7R*R}  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ;N _ %O  
 str.ReleaseBuffer(); 9HlM0qE5b  
 m_Path=str; M IUB]  
 if(str.GetAt(str.GetLength()-1)!='\\') ;;EFiaA  
  m_Path+="\\"; owO &[D/  
 UpdateData(FALSE); aZ ta%3`)  
} a6/ETQ  
LM!@LQAMY  
void CCaptureDlg::SaveBmp() !VvM  
{ `0R>r7f)H  
 CDC dc; b1Ba}  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); f>?b2a2HX  
 CBitmap bm; ; y>}LGG  
 int Width=GetSystemMetrics(SM_CXSCREEN); $^#q0Yx  
 int Height=GetSystemMetrics(SM_CYSCREEN); uU+?:C  
 bm.CreateCompatibleBitmap(&dc,Width,Height); !B#tJD  
 CDC tdc; UXHtmi|_:  
 tdc.CreateCompatibleDC(&dc); P;ZVv{mT  
 CBitmap*pOld=tdc.SelectObject(&bm); Vz y )jf  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 3tmS/ tQp  
 tdc.SelectObject(pOld); GbC JGqOR  
 BITMAP btm; }5QUIK~NA  
 bm.GetBitmap(&btm); U(<~("ocN  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; xp"F)6  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 1.a:iweN  
 BITMAPINFOHEADER bih; tA K=W$r  
 bih.biBitCount=btm.bmBitsPixel; :,'.b|Tl.b  
 bih.biClrImportant=0; U a1Z,~ *  
 bih.biClrUsed=0; c{i\F D  
 bih.biCompression=0; q6P5:@  
 bih.biHeight=btm.bmHeight; D:N\K/p  
 bih.biPlanes=1; c>#3{}X|x%  
 bih.biSize=sizeof(BITMAPINFOHEADER); 4&B|rf  
 bih.biSizeImage=size; <?!%dV{z  
 bih.biWidth=btm.bmWidth; z,SNJIsx  
 bih.biXPelsPerMeter=0; F Zk[w>{  
 bih.biYPelsPerMeter=0; 3X1 U  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); \YH*x`  
 static int filecount=0; w|ct="MG  
 CString name; <I2~>x5db  
 name.Format("pict%04d.bmp",filecount++); v0%FG9Gk  
 name=m_Path+name; QEY#U|  
 BITMAPFILEHEADER bfh; byIP]7Ld  
 bfh.bfReserved1=bfh.bfReserved2=0; {\ BFWGX  
 bfh.bfType=((WORD)('M'<< 8)|'B'); "s\himoa  
 bfh.bfSize=54+size; Lo +H&-  
 bfh.bfOffBits=54; H*&!$s.  
 CFile bf; }wGy#!CSza  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ q9(hn_X@/  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 1_)Y{3L  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); qK&h$;~*y  
  bf.WriteHuge(lpData,size); ^O3p:X4u  
  bf.Close(); |b|bL 7nx  
  nCount++; -.UUa  
 } *47%| bf`  
 GlobalFreePtr(lpData); +3-f$/po  
 if(nCount==1) S$nEflcz  
  m_Number.Format("%d picture captured.",nCount); |<LW(,|A  
 else U{3Pk0rZ  
  m_Number.Format("%d pictures captured.",nCount); ->@iw!5xu  
  UpdateData(FALSE); eXtlqU$  
} WAGU|t#."  
ET~^P  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) E,|OMK#   
{ R^6^ {q  
 if(pMsg -> message == WM_KEYDOWN) K`kWfPwp  
 { .wcKG9u  
  if(pMsg -> wParam == VK_ESCAPE) q>VvXUyK,  
   return TRUE; ? UBE0C  
  if(pMsg -> wParam == VK_RETURN) 5Yx 7Q:D  
   return TRUE; 2 57q%"  
 } eg>]{`WQ  
 return CDialog::PreTranslateMessage(pMsg); oD%B'{Zs4  
} ;VgB!  
^FK-e;J  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) EA<x$O  
{ NO.5Vy  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ b!z=:  
  SaveBmp(); ?"T *{8  
  return FALSE; dijHi  
} bO+L#Kf  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ uBo~PiJ2"  
 CMenu pop; N-Sjd%Z  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 2?c%<_jPA  
 CMenu*pMenu=pop.GetSubMenu(0); ;VPYWss  
 pMenu->SetDefaultItem(ID_EXITICON); ljk,R G  
 CPoint pt; >F;yfv;  
 GetCursorPos(&pt); zR }vw{  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); @}A3ie'w  
 if(id==ID_EXITICON) lFc^y  
  DeleteIcon(); 8Y~\:3&1<  
 else if(id==ID_EXIT) ~G8haN4  
  OnCancel(); *En4~;l  
 return FALSE; I<$m%  
} O[HBw~  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 7u[$  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) e `IL7$  
 AddIcon(); &=v5M9GR]  
 return res; ;C+ _KS  
} 4 _Idf  
6Zq7O\  
void CCaptureDlg::AddIcon() V%n7 h&\%  
{ ~|=G3( I[  
 NOTIFYICONDATA data;  =E:a\r  
 data.cbSize=sizeof(NOTIFYICONDATA); e&F=w`F\  
 CString tip; vA0f4W 8+  
 tip.LoadString(IDS_ICONTIP); Rc`zt7hbJ  
 data.hIcon=GetIcon(0); z6bIv }  
 data.hWnd=GetSafeHwnd(); #|acRZ9 }  
 strcpy(data.szTip,tip); -o`|A767  
 data.uCallbackMessage=IDM_SHELL; $R/@%U)-o  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; WD?COUEox  
 data.uID=98; 4Pr@<S"U  
 Shell_NotifyIcon(NIM_ADD,&data); -y)g}D%  
 ShowWindow(SW_HIDE); OG2&=~hOz-  
 bTray=TRUE; wXUgxa  
} LKu ,H  
#:} mi;{  
void CCaptureDlg::DeleteIcon() (Z at|R.F  
{ ;%$wA5"2M  
 NOTIFYICONDATA data; G'6f6i|<I@  
 data.cbSize=sizeof(NOTIFYICONDATA); C: a</Sl  
 data.hWnd=GetSafeHwnd(); \%]!/&>{6  
 data.uID=98; ' 8UhYwyr  
 Shell_NotifyIcon(NIM_DELETE,&data); @z7$1pl}  
 ShowWindow(SW_SHOW); d8/KTl  
 SetForegroundWindow(); (KdP^.7  
 ShowWindow(SW_SHOWNORMAL); Z}$1~uyw  
 bTray=FALSE; ^h"F\vIpV  
} 2)jf~!o)Z  
MHAWnH8  
void CCaptureDlg::OnChange() #i[V {J8.p  
{ 7>yb8/J  
 RegisterHotkey(); cW\Y1=Gv|  
} &%`0&y  
m7m)BX%O  
BOOL CCaptureDlg::RegisterHotkey() p"=8{LrO  
{ T+)#Du  
 UpdateData(); NC{8[*Kx5  
 UCHAR mask=0; hZeF? G)L'  
 UCHAR key=0; 4F?O5&329i  
 if(m_bControl) <5sP%Fs)  
  mask|=4; qc@v"pIz'S  
 if(m_bAlt) Y EhPAQNj  
  mask|=2; vU,;asgy  
 if(m_bShift) c"^g*i2&0  
  mask|=1; MnD^jcx   
  key=Key_Table[m_Key.GetCurSel()]; $1;@@LSw  
 if(bRegistered){ td\'BV  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 55vI^SSA  
  bRegistered=FALSE; .*g^ i`  
 } l08JL  
 cMask=mask; 5Z(#)sa0Og  
 cKey=key; lsRW.h,  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); %2EHYBQjN  
 return bRegistered; nSeb?|$D6  
} wb/@g=` d  
-)Y[t Z^*`  
  四、小结 u1_NC;  
s. jcD  
  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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