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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: ?w+ V:D  
  z$WLx  
  一、实现方法 X8">DR&>Y  
u~aRFQ:  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: Qz3Z_V4k9  
aL%E#  
#pragma data_seg("shareddata") 4hODpIF  
HHOOK hHook =NULL; //钩子句柄 SiUu**zC  
UINT nHookCount =0; //挂接的程序数目 yOt#6Vw  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Fn7OmxfD  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Qn,6s%n  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey _&/ {A|n  
static int KeyCount =0; a6-.|tt#t  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 B0%=! &  
#pragma data_seg() 9 h?'zyX B  
[iEz?1.,  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 S>r",S  
>=|p30\b  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ;0Pv49q  
SI=u-'%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR NB4O,w  
cKey,UCHAR cMask) PO?_i>mA  
{ r5Tdp)S  
 BOOL bAdded=FALSE; !Av9 ?Q:  
 for(int index=0;index<MAX_KEY;index++){ U(9_&sL  
  if(hCallWnd[index]==0){ ^:]$m;v]  
   hCallWnd[index]=hWnd; p |1u,N  
   HotKey[index]=cKey; h='F,r5#2  
   HotKeyMask[index]=cMask; # )y/aA  
   bAdded=TRUE; [ r8 ZAS  
   KeyCount++;  -X71JU  
   break; )+hV+rM jp  
  } Yu>DgMW  
 } msM1K1er  
 return bAdded; |PlNVd2  
} Rh?bBAn8  
//删除热键 ~y2zl  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2Jio_Hk  
{ ]Ob|!L(  
 BOOL bRemoved=FALSE; u;gO+)wqv  
 for(int index=0;index<MAX_KEY;index++){ 4uo`XJuQ  
  if(hCallWnd[index]==hWnd){ z8'1R6nq  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `}$o<CJ  
    hCallWnd[index]=NULL; %KXiB6<4  
    HotKey[index]=0; {VL@U$'oI  
    HotKeyMask[index]=0; =I'3C']Z W  
    bRemoved=TRUE; o[T+/Ej&  
    KeyCount--; ;,C]WZ.w  
    break; R2gV(L(!!  
   } 0n}13u=}  
  } M[gL7-%w\  
 } yGf7k>K'  
 return bRemoved; dy&UF,l6  
} 7l=;I%  
[/UchU]DT  
w{6C4~0  
  DLL中的钩子函数如下: Wc[,kc  
a/,>fv9;$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) akxNT_   
{ Y8\P"q b  
 BOOL bProcessed=FALSE; uv27Vos  
 if(HC_ACTION==nCode) YR9fw  
 { pW(rNAJ!  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 BzP,Tu{,  
   switch(wParam) &~ y)b`r  
   {  cKe%P|8  
    case VK_MENU: 6(Pan%  
     MaskBits&=~ALTBIT; i(^U<DW$  
     break; {P]C>  
    case VK_CONTROL: GWnIy6TH l  
     MaskBits&=~CTRLBIT; @#)` -]g  
     break; "y,YC M`  
    case VK_SHIFT: kg[%Q]]  
     MaskBits&=~SHIFTBIT; 8w&-O~M  
     break; UJ)pae  
    default: //judge the key and send message _`|1B$@x  
     break; d]pb1ECuu  
   } (~=.[Y  
   for(int index=0;index<MAX_KEY;index++){ En?V\|,  
    if(hCallWnd[index]==NULL) xzm]v9k&  
     continue; z%%O-1   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W]9*dabem  
    { jO-?t9^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @h%V:c  
     bProcessed=TRUE; 4VWk/HK-!  
    } mm-s?+&M;  
   } ZgP%sF  
  } G^~[|a 4`  
  else if((lParam&0xc000ffff)==1){ //有键按下 Xv8-<Ks  
   switch(wParam) L>1hiD&  
   { xc:E>-  
    case VK_MENU: PgWWa*Ew  
     MaskBits|=ALTBIT; &X$T "Dp  
     break; =_7wd*,  
    case VK_CONTROL: ~2w&+@dV%  
     MaskBits|=CTRLBIT; <W80AJ  
     break; /SD}`GxH  
    case VK_SHIFT: cqS :Zq  
     MaskBits|=SHIFTBIT; {AL EK   
     break; n qcq3o*B  
    default: //judge the key and send message J:L+q} A  
     break; MzJCiX^  
   } Cbw *? 9d  
   for(int index=0;index<MAX_KEY;index++){ &A QqI  
    if(hCallWnd[index]==NULL) Je1d|1!3  
     continue; bbK};u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lLx!_h  
    { m+kP"]v  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); {^VtD  
     bProcessed=TRUE; W$rWg>4>  
    } ~~tTr $  
   } %ou,|Dww  
  } {ez $kz  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 `>gG"1,]  
   for(int index=0;index<MAX_KEY;index++){ 5p;AON  
    if(hCallWnd[index]==NULL) 'o >)E>  
     continue; M"~jNe|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;b$P*dSG}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Dqx#i-L23  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 _ E;T"SC  
   } Zv u6/#  
  } XO <wK  
 } Z*%;;&?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); RP4/:sO  
} yB b%#GW  
uJ !&T  
  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: =}^NyLE?  
,XD" p1(|G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Jl Do_}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^\\3bW9}H  
(#Y~z',I  
  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: Bt+^H6cb  
$)i`!7`4=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) c/;;zc  
{ oL<#9)+2*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) )ZG;.j  
 { *o6}>;  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 bx0.(Nv/X  
  SaveBmp(); AjC:E+g  
  return FALSE; :t}\%%EbmE  
 } R'Sd'pSDN  
 …… //其它处理及默认处理 h)KHc/S  
} jEc_!Q  
SepjF  
K:PH: e  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 { i5?R,a)  
D BT4 W/  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 "g{q=[U}  
LK^|JEu  
  二、编程步骤 :RaQ =C  
C"{^wy{sL  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; (o^tmH*  
"HMEoZ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; {keZ_2  
"[bkdL<  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; L$ZjMJ  
d>NGCe  
  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; /F*Y~>*% 1  
w+M/VsL  
  5、 添加代码,编译运行程序。 *$tXm4 O[  
3<0b_b  
三、程序代码 )DSeXS[ e  
+>ju,;4WK  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL fqNh\~kja  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) [GwAm>k  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ pGbfdX  
#if _MSC_VER > 1000 i! .]U@{k  
#pragma once |LHJRP-Z  
#endif // _MSC_VER > 1000 FXQWT9Kk~_  
#ifndef __AFXWIN_H__ ke4E 1T-1n  
#error include 'stdafx.h' before including this file for PCH LCF}Y{  
#endif  j]u!;]  
#include "resource.h" // main symbols \Z-th,t  
class CHookApp : public CWinApp  q6 CrUn  
{ !b8V&<  
 public: F'bwXb**  
  CHookApp(); -^_m(@A<~  
  // Overrides "F F$Q#)  
  // ClassWizard generated virtual function overrides _jWs(OmJ  
  //{{AFX_VIRTUAL(CHookApp) `MtzA^Xr  
 public: 8fC4j`!  
  virtual BOOL InitInstance(); OgQd yU  
  virtual int ExitInstance(); /<LZt<K  
  //}}AFX_VIRTUAL e~r/!B5X  
  //{{AFX_MSG(CHookApp) XJ18(Q|w'  
  // NOTE - the ClassWizard will add and remove member functions here. K$"#SZEi  
  // DO NOT EDIT what you see in these blocks of generated code ! UhxM85M;x  
  //}}AFX_MSG MK&,2>m,A  
  DECLARE_MESSAGE_MAP() u[>"_!T  
}; (jc@8@Wo.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); <2$vo  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); y Zaf q"o  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); j\2Qe %d  
BOOL InitHotkey(); SSK}'LQ  
BOOL UnInit(); %I1@{>OxG  
#endif 6g(;2gY  
r`H}f#.KR  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. #M,&g{  
#include "stdafx.h" gf|uZ9{  
#include "hook.h" u'YXI="(  
#include <windowsx.h> |z-f 8$  
#ifdef _DEBUG x/|W;8g4  
#define new DEBUG_NEW 'jev1u[  
#undef THIS_FILE q<3nAE$?=  
static char THIS_FILE[] = __FILE__; CM6% g f3  
#endif 144Y.  
#define MAX_KEY 100  Q !X?P  
#define CTRLBIT 0x04 OO:S2-]Y>e  
#define ALTBIT 0x02 uLhGp@Dx  
#define SHIFTBIT 0x01 B8&q$QV  
#pragma data_seg("shareddata") q_MN  
HHOOK hHook =NULL; l;?:}\sI=  
UINT nHookCount =0; pUIN`ya[[  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Q(|@&83].  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT X+X:nL.t  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey yD\q4G  
static int KeyCount =0; ?N#I2jxaD  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift +! 1_Mt6  
#pragma data_seg() &@~K8*tmK  
HINSTANCE hins; ah>c)1DA*H  
void VerifyWindow(); B#K gU&Loo  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) -y`Pm8  
//{{AFX_MSG_MAP(CHookApp) ;6tra_  
// NOTE - the ClassWizard will add and remove mapping macros here. _l d.Xmvd  
// DO NOT EDIT what you see in these blocks of generated code! ?]Yic]$n  
//}}AFX_MSG_MAP ot0teNF  
END_MESSAGE_MAP() ~i,d%a  
&l(T},-X  
CHookApp::CHookApp() 7?.uAiM'zT  
{ x:SjdT  
 // TODO: add construction code here, -(vHy/Hz.  
 // Place all significant initialization in InitInstance )nUdU = m  
} _c5@)I~  
L&\W+k  
CHookApp theApp; ym;]3<I?I[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) l*CulVX  
{ G[64qhTC  
 BOOL bProcessed=FALSE; ,@*5x'auK  
 if(HC_ACTION==nCode) ]_KWN$pd  
 { $LP(\T([  
  if((lParam&0xc0000000)==0xc0000000){// Key up _i =*0Q  
   switch(wParam) eI8o#4nT  
   { * #yF`_p  
    case VK_MENU: K\xz|Gq  
     MaskBits&=~ALTBIT; WowKq0sn  
     break; `M@ESA (e  
    case VK_CONTROL: p=+Y7NE)  
     MaskBits&=~CTRLBIT; xP8/1wd.  
     break; 0h-NT\m  
    case VK_SHIFT: &;Ncc,jb  
     MaskBits&=~SHIFTBIT; O,$*`RZpx  
     break; z#{Y>.b  
    default: //judge the key and send message FZ*"^=)`G  
     break; " ityx?  
   } CD1Ma8I8  
   for(int index=0;index<MAX_KEY;index++){ pY&6p~\p  
    if(hCallWnd[index]==NULL) 3u@,OE  
     continue; #}A"yo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ZflB<cI  
    { s_^`t+5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); |d0X1(  
     bProcessed=TRUE; =dXHQU&Q  
    } }Qo]~/  
   } b9g2mWL\T  
  } ;~3;CijJ8  
  else if((lParam&0xc000ffff)==1){ //Key down 2/SUEnaLy_  
   switch(wParam) g[cnaS|?  
   { =!Ik5LiD  
    case VK_MENU: {i>AQ+z61f  
     MaskBits|=ALTBIT; _L,~WYRo  
     break; MN: {,#d0  
    case VK_CONTROL: #}Qe{4L  
     MaskBits|=CTRLBIT; Dj/Hz\  
     break; Df"PNUwA"  
    case VK_SHIFT:  ?K-4T  
     MaskBits|=SHIFTBIT; PKlR_#EB?  
     break; .ATpwFal  
    default: //judge the key and send message >~g-  
     break; %! ` %21  
   } ,[n9DPZ  
   for(int index=0;index<MAX_KEY;index++) }B%9cc  
   { L7ae6#5.  
    if(hCallWnd[index]==NULL) b+Q{Z*  
     continue; kEh9J>|M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  Wvb ~j  
    { /&6{}n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6;E3|st1X  
     bProcessed=TRUE; ,Uh^e]pC  
    } +9/K|SB{ $  
   } "8Dm7)nB  
  } `;mgJD  
  if(!bProcessed){ m%9Yo%l~  
   for(int index=0;index<MAX_KEY;index++){ _DR@P(0>_  
    if(hCallWnd[index]==NULL) 7-3  
     continue; NSVE3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) " ILF!z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Xl=RaV^X"  
   } $YJ 1P  
  } @ 5d^ C  
 } 6{I7=.V  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); F`KXG$  
} KKwM\   
VjM/'V5  
BOOL InitHotkey() @@ j\OR  
{ \p:)Cdn  
 if(hHook!=NULL){ NG3?OAQTw  
  nHookCount++; <v1H1'gv  
  return TRUE; Boj R"  
 } & n*ga$Q  
 else _J*l,]}S  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); qt:B]#j@  
  if(hHook!=NULL) xst-zfkH`  
   nHookCount++; 7,)E1dx -V  
  return (hHook!=NULL); I(UK9H{0$  
} 0Hrvr  
BOOL UnInit() hq"n RH  
{ g Cp`J(2v:  
 if(nHookCount>1){ kNP-+o  
  nHookCount--; Vc0j)3  
  return TRUE; LYAGpcG  
 } <hzHrx'o{  
 BOOL unhooked = UnhookWindowsHookEx(hHook); [XPAI["  
 if(unhooked==TRUE){ r'ilJ("  
  nHookCount=0; "d}']M?-h  
  hHook=NULL; =lv(  
 } *BxU5)O  
 return unhooked; ; &rxwL  
} <\nM5-wR  
Tkr~)2,(I!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) O:v#M]   
{ .joCZKO  
 BOOL bAdded=FALSE; ;nlJ D#  
 for(int index=0;index<MAX_KEY;index++){ ZXLAX9|  
  if(hCallWnd[index]==0){ h~QQ-  
   hCallWnd[index]=hWnd; -8)C6"V{  
   HotKey[index]=cKey; _)@G,E33f@  
   HotKeyMask[index]=cMask; pZ $>Hh#  
   bAdded=TRUE; 0~<?*{~  
   KeyCount++; h0-.9ym  
   break; G%Lt>5*!nE  
  } TFldYKd/l  
 } ~M7X]  
 return bAdded; iwIn3R,  
} 3 85qQppz  
{pQ8/Af!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /.s L[X-G  
{ UV|{za$&/  
 BOOL bRemoved=FALSE; W +Piqf*  
 for(int index=0;index<MAX_KEY;index++){ 6r^ZMW  
  if(hCallWnd[index]==hWnd){ o>*`wv  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ FoE}j   
    hCallWnd[index]=NULL; [-`s`g-  
    HotKey[index]=0; (4z_2a(Dl,  
    HotKeyMask[index]=0; =f@71D1  
    bRemoved=TRUE; 2cu2S"r  
    KeyCount--; =H: N!!:  
    break; Obu 6k[BE.  
   } Zk7!CJVM  
  } ;=0-B&+v  
 } P:J|![   
 return bRemoved; }A6z%|d  
} m5/]+xdNX  
[4EIy"  
void VerifyWindow() f7zB_hVDmE  
{ V(XU^}b#  
 for(int i=0;i<MAX_KEY;i++){ Mmgm6{  
  if(hCallWnd!=NULL){ C-_u`|jQ  
   if(!IsWindow(hCallWnd)){ r:rPzq1  
    hCallWnd=NULL; 5~>j98K  
    HotKey=0; ~Y0K Wx4  
    HotKeyMask=0; ;"f9"  
    KeyCount--; -~sW@u)O  
   } f*V^HfiQb  
  } p%Q{Rqc)  
 } e`B!)Sr  
} zp4@T)  
;B< rw ^h5  
BOOL CHookApp::InitInstance() + S5uxO  
{ Tq^B>{S "  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); UU}Hs}  
 hins=AfxGetInstanceHandle(); A?-t`J  
 InitHotkey(); /:-ig .YY  
 return CWinApp::InitInstance(); ; p+C0!B2  
} \k$cg~  
eVj 8u  
int CHookApp::ExitInstance() { zL4dJw  
{ F:Vl\YZ  
 VerifyWindow(); , iEGf-!k  
 UnInit(); 8~!h8bkC  
 return CWinApp::ExitInstance(); dr8Q>(ZY  
} %U<lS.i  
a@_n>$LZL  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file hQ)?LPUB  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Yjy%MR  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ | Eu#mN  
#if _MSC_VER > 1000 Q(WfWifu-|  
#pragma once 8z-wdO\  
#endif // _MSC_VER > 1000 ]Gj%-5G  
b;`MHEzw&q  
class CCaptureDlg : public CDialog XThU+s9  
{ ?!tO'}?  
 // Construction lh\`9F:  
 public: %YuFw|wO  
  BOOL bTray; 0m4#{^Y  
  BOOL bRegistered; l7WZ" 6d  
  BOOL RegisterHotkey(); /w5c:BH  
  UCHAR cKey; %}  
  UCHAR cMask; yp hd'Pu"  
  void DeleteIcon(); q@mZ0D-  
  void AddIcon(); @Us#c 7/  
  UINT nCount; Sw{rNzh%$  
  void SaveBmp(); mmC MsBfL  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor X#W6;?Z\  
  // Dialog Data B|>eKI  
  //{{AFX_DATA(CCaptureDlg) I]#x0?D  
  enum { IDD = IDD_CAPTURE_DIALOG }; IQ JFL +f  
  CComboBox m_Key; GB*^?Ii  
  BOOL m_bControl; kT^`j^Jr  
  BOOL m_bAlt; qP/McH?  
  BOOL m_bShift; Kk% I N9  
  CString m_Path; Kk\,q?  
  CString m_Number; *EU1`q*  
  //}}AFX_DATA gsIp y  
  // ClassWizard generated virtual function overrides !}d_$U$  
  //{{AFX_VIRTUAL(CCaptureDlg) Ngrj@_J  
 public: S>[&]  
  virtual BOOL PreTranslateMessage(MSG* pMsg); W Emh  
 protected: |>JRJ"CFE  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support U d+6=Us{  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); U,< ?]h  
  //}}AFX_VIRTUAL q)"yP\  
  // Implementation M VE:JNm  
 protected: #E/|W T  
  HICON m_hIcon; +D h?MQt?  
  // Generated message map functions =4/K#cQ  
  //{{AFX_MSG(CCaptureDlg) %u?A>$Jn  
  virtual BOOL OnInitDialog(); (>\4%(pnD  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ;MO,HdP;  
  afx_msg void OnPaint(); =EHKu|rX~  
  afx_msg HCURSOR OnQueryDragIcon(); P!R`b9_U  
  virtual void OnCancel(); H/0b3I^  
  afx_msg void OnAbout(); |i(@1 l  
  afx_msg void OnBrowse(); bM,%+9oz;  
  afx_msg void OnChange(); Z%{`j!!p  
 //}}AFX_MSG [Z[ p@Ux  
 DECLARE_MESSAGE_MAP() 2"Ki5  
}; BS?rKtdm(  
#endif ;0dl  
Jk`0yJi$q  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $B )jSxSy  
#include "stdafx.h" GS GaYq  
#include "Capture.h" aqP"Y9l  
#include "CaptureDlg.h" 6(B[(Af  
#include <windowsx.h> >Qf`xUZ  
#pragma comment(lib,"hook.lib") #%/0a  
#ifdef _DEBUG 'V4B{n7 h  
#define new DEBUG_NEW qwuA[QkPi  
#undef THIS_FILE No'Th7=|S  
static char THIS_FILE[] = __FILE__; xy^z_`  
#endif wA";N=i=  
#define IDM_SHELL WM_USER+1 x qj@T^y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E**Hu9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  _dVA^m  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 69Q#UJ  
class CAboutDlg : public CDialog W> $mU&ew[  
{ uF@DJX}>  
 public: !$0ozDmD  
  CAboutDlg(); e$-Y>Dd  
  // Dialog Data "2 qivJ  
  //{{AFX_DATA(CAboutDlg) F,xFeq$/{  
  enum { IDD = IDD_ABOUTBOX }; 239g pf]}  
  //}}AFX_DATA ZY)&Fam}  
  // ClassWizard generated virtual function overrides )%I62<N,z  
  //{{AFX_VIRTUAL(CAboutDlg) 1[(/{CClB  
 protected: \2 [  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _WBWFGj  
  //}}AFX_VIRTUAL 0w".o!2\U{  
  // Implementation {G-y7y+E  
 protected: Z"9D1Uk  
  //{{AFX_MSG(CAboutDlg) Oz5Ze/HBN  
  //}}AFX_MSG i7O8f^|  
  DECLARE_MESSAGE_MAP() Mir( }E  
}; nhB.>ReAi  
TdrRg''@  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) m>^#:JK  
{ BKfoeN)%  
 //{{AFX_DATA_INIT(CAboutDlg) VBg M7d  
 //}}AFX_DATA_INIT 810uxw{\  
} Nf9$q| %!  
%xwtG:IKEV  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) zRA,Yi4;+  
{ 'Fa~l'G7X  
 CDialog::DoDataExchange(pDX); 8sU}[HH*1  
 //{{AFX_DATA_MAP(CAboutDlg) aB~=WWLR\  
 //}}AFX_DATA_MAP P?M WT]fY  
} Hg+bmwM  
8^qLGUxz  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Dp;6CGYl?  
 //{{AFX_MSG_MAP(CAboutDlg) R5r CCp  
 // No message handlers l7S&s&W @  
 //}}AFX_MSG_MAP +{&++^(}a  
END_MESSAGE_MAP() I*= =I4qx  
hODq& 9!  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) F t;[>o  
: CDialog(CCaptureDlg::IDD, pParent) BA`K,#Ft7  
{ 6z1>(Za7>  
 //{{AFX_DATA_INIT(CCaptureDlg) <w0$0ku  
  m_bControl = FALSE; =\x(Rs3  
  m_bAlt = FALSE; IUwMIHq&sW  
  m_bShift = FALSE; aeTVcq  
  m_Path = _T("c:\\"); HhT6gJWrU  
  m_Number = _T("0 picture captured."); a>)|SfsE  
  nCount=0; /~_,p,:aP  
  bRegistered=FALSE; j<-YK4.t  
  bTray=FALSE; ?`=r@  
 //}}AFX_DATA_INIT ^r^)  &]  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 O`'r:&#W  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 1y6{3AZm<  
} 5H/D~hr&  
?&$BQK  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) e/y\P&"eI  
{ 0)9'x)l:  
 CDialog::DoDataExchange(pDX);  pytF K)U  
 //{{AFX_DATA_MAP(CCaptureDlg) aF:|MTC(~  
  DDX_Control(pDX, IDC_KEY, m_Key); K`twbTU  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); FSkz[D_}  
  DDX_Check(pDX, IDC_ALT, m_bAlt); McRfEF \  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ~|=goHmm[  
  DDX_Text(pDX, IDC_PATH, m_Path); 2!g7F`/B  
  DDX_Text(pDX, IDC_NUMBER, m_Number); L%0G >2x  
 //}}AFX_DATA_MAP Hge0$6l  
} hH=}<@z   
qku!Mg  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) @SH$QUM(  
//{{AFX_MSG_MAP(CCaptureDlg) 7\ kixfEg  
 ON_WM_SYSCOMMAND() gwv s  
 ON_WM_PAINT() Y #6G&)M  
 ON_WM_QUERYDRAGICON() vC%8-;8{H  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) O" ,*N  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) hBNA,e:  
 ON_BN_CLICKED(ID_CHANGE, OnChange) }:4b_-&Q5  
//}}AFX_MSG_MAP ^n<o,K4\}  
END_MESSAGE_MAP() T8-,t];i  
TCetd#;R  
BOOL CCaptureDlg::OnInitDialog() #'oGtFCd`  
{ iCh,7I,m  
 CDialog::OnInitDialog(); 6@geakq  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); K_ [B@( Xl  
 ASSERT(IDM_ABOUTBOX < 0xF000); 5!iBKOl#D  
 CMenu* pSysMenu = GetSystemMenu(FALSE); a X:,1^  
 if (pSysMenu != NULL) <%:,{u6  
 { h4k.1yH;  
  CString strAboutMenu; rnS&^  
  strAboutMenu.LoadString(IDS_ABOUTBOX); VL| q`n  
  if (!strAboutMenu.IsEmpty()) - DE?L,9X9  
  { TAKv E=a;  
   pSysMenu->AppendMenu(MF_SEPARATOR); hScC< =W  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); .{ r %C4q9  
  } @_C?M5v  
 } p2uZ*sY(D  
 SetIcon(m_hIcon, TRUE); // Set big icon pn-`QB:{h  
 SetIcon(m_hIcon, FALSE); // Set small icon 8;1,saA_9  
 m_Key.SetCurSel(0); !t!\b9=  
 RegisterHotkey(); b[`fQv$G  
 CMenu* pMenu=GetSystemMenu(FALSE); 2mfKy9QxO  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); O}mz@- Z  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7':qx}c#!1  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); db5@+_  
 return TRUE; // return TRUE unless you set the focus to a control )|`|Usn#[  
} M Qlx&.>  
@;ob 4sU  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ])H[>.?K  
{ XPsRa[08WK  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) .|z8WF*  
 { j55;E E!  
  CAboutDlg dlgAbout; qC ku q  
  dlgAbout.DoModal(); acdF5ch@  
 } We?cRb  
 else k;xIo(:  
 { \O(~:KN  
  CDialog::OnSysCommand(nID, lParam); .<kbYo:MV  
 } qttJ*zu  
} _0EKE  
}>< v7  
void CCaptureDlg::OnPaint() qpXsQim$~  
{ R.$1aqA}  
 if (IsIconic()) 8(|lP58~  
 { JJVdq-k+`  
  CPaintDC dc(this); // device context for painting PiZU _~A  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); +jN%w{^=  
  // Center icon in client rectangle 5tQZf'pHfd  
  int cxIcon = GetSystemMetrics(SM_CXICON); 5><KTya?=  
  int cyIcon = GetSystemMetrics(SM_CYICON); RSK5 }2  
  CRect rect; $Z[W}7{pt#  
  GetClientRect(&rect); )H| cri~D  
  int x = (rect.Width() - cxIcon + 1) / 2; c-q=Ct  
  int y = (rect.Height() - cyIcon + 1) / 2; 8D6rShx =  
  // Draw the icon G"D=ozr  
  dc.DrawIcon(x, y, m_hIcon); WI}cXXUKm0  
 } caXSt2|'  
 else &$8YW]1M  
 { ~zph,bk  
  CDialog::OnPaint(); o GN*p_g  
 } m*H' Cb  
} ?:+sjHzXT  
\<0xg[  
HCURSOR CCaptureDlg::OnQueryDragIcon() : oO ?A  
{ y`8 bx94jB  
 return (HCURSOR) m_hIcon; iTIYq0u|#R  
} ~x6<A\  
83g$k 9lG.  
void CCaptureDlg::OnCancel() s5 ($b  
{ $ n"*scyI  
 if(bTray) wjc&S'[  
  DeleteIcon(); w~wg[d  
  CDialog::OnCancel(); "'v^X!"  
} T3,}CK#O   
L. DD  
void CCaptureDlg::OnAbout() +\)a p  
{ 3:"w"0[K3  
 CAboutDlg dlg; ~Y3X*  
 dlg.DoModal(); 45.Vr[FS.  
} WO!'("  
br%l>Y\"  
void CCaptureDlg::OnBrowse() x". !&5  
{ !yo@i_1D  
 CString str; .)Zs:5 0l  
 BROWSEINFO bi; Ci_Qra 6  
 char name[MAX_PATH]; 8T?D#,/  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); am+w<NJ(us  
 bi.hwndOwner=GetSafeHwnd(); P^[y~I#{  
 bi.pszDisplayName=name; _bn "c@s  
 bi.lpszTitle="Select folder"; ;DX g  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; e6gLYhf&  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); OWT|F0.1$k  
 if(idl==NULL) P "%f8C~r  
  return; Yaj}_M-  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); = :BTv[lv  
 str.ReleaseBuffer(); N~~ sM"n  
 m_Path=str; hMnm>  
 if(str.GetAt(str.GetLength()-1)!='\\') ;b_l/T(  
  m_Path+="\\"; ?Sr7c|a2  
 UpdateData(FALSE); > PK 6CR  
} RmRPR<vGW  
ve^gzE$<I  
void CCaptureDlg::SaveBmp() yS1i$[JV  
{ YF)k0bu&;  
 CDC dc; d<Dm(   
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;cfPS  
 CBitmap bm; <S3s==Cg  
 int Width=GetSystemMetrics(SM_CXSCREEN); &a.A8v)  
 int Height=GetSystemMetrics(SM_CYSCREEN); Z -fiJ75  
 bm.CreateCompatibleBitmap(&dc,Width,Height); JA~q}C7A7o  
 CDC tdc; 7#(0GZN9h%  
 tdc.CreateCompatibleDC(&dc); ?&?5x%|.<  
 CBitmap*pOld=tdc.SelectObject(&bm); 3?e~J"WXC5  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6/6{69tnr  
 tdc.SelectObject(pOld); otbr8&?-  
 BITMAP btm; nzU;Bi^m  
 bm.GetBitmap(&btm); xauMF~*  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; =SD^Jl{H  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); nh*6`5yj  
 BITMAPINFOHEADER bih; 6bN8}\5  
 bih.biBitCount=btm.bmBitsPixel; !<>*|a  
 bih.biClrImportant=0; eZBC@y  
 bih.biClrUsed=0; N}>[To3  
 bih.biCompression=0; 2Q5 -.2]  
 bih.biHeight=btm.bmHeight; AQwai>eL  
 bih.biPlanes=1; |k^C-  
 bih.biSize=sizeof(BITMAPINFOHEADER); 055C1RV%  
 bih.biSizeImage=size; $plqk^P  
 bih.biWidth=btm.bmWidth; [}!0PN?z~A  
 bih.biXPelsPerMeter=0; 6aLRnH"Ud  
 bih.biYPelsPerMeter=0; ^?NLA&v<  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); AuT:snCzR  
 static int filecount=0; ]>B4  
 CString name; Eq|5PE^7  
 name.Format("pict%04d.bmp",filecount++); }N&? 8s=  
 name=m_Path+name; ?|~KF:,#}  
 BITMAPFILEHEADER bfh; z69u@  
 bfh.bfReserved1=bfh.bfReserved2=0; \q\"=  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 0S96x}]J B  
 bfh.bfSize=54+size; q%LjOPE V  
 bfh.bfOffBits=54; [* M':  
 CFile bf; BA[ uO3\4  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ N\|BaZ%>|  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); V!l?FOSZ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 4n"6<cO5q  
  bf.WriteHuge(lpData,size); 6-z(34&N  
  bf.Close();  aWPf3Q  
  nCount++; b gxk:$E  
 } `<{LW>Lb  
 GlobalFreePtr(lpData); "  sC]z}  
 if(nCount==1) D?=4'"@v  
  m_Number.Format("%d picture captured.",nCount); \SoT^PW  
 else e+V8I&%  
  m_Number.Format("%d pictures captured.",nCount); J/IRCjQ}  
  UpdateData(FALSE); 5'(T*"  
} 33 ; '6/  
QQHQ3 \  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) N0%q 66]1  
{ ZZL@UO>:  
 if(pMsg -> message == WM_KEYDOWN) zf&:@P{  
 { sY4q$Fq  
  if(pMsg -> wParam == VK_ESCAPE) CF 3V)3}  
   return TRUE; zU0SlRFu  
  if(pMsg -> wParam == VK_RETURN) a?yU;IKJ  
   return TRUE; r.lHlHl  
 } Wm}gnNwA  
 return CDialog::PreTranslateMessage(pMsg); \E[6wB>uN%  
} e{9~m  
r@/@b{=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Q :.i[  
{ _a f $0!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ YUHiD *  
  SaveBmp(); SU1N*k#-o  
  return FALSE; ?4oP=.  
} c/igw+L()  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ li,rPUCt  
 CMenu pop; ?J,,RK.  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); z(>QGzyc  
 CMenu*pMenu=pop.GetSubMenu(0); 2W2T  
 pMenu->SetDefaultItem(ID_EXITICON); TMo DN%{  
 CPoint pt; T@*'}*  
 GetCursorPos(&pt); y$9! rbL  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 0n'v F&E8  
 if(id==ID_EXITICON) }%z%}V@(&  
  DeleteIcon(); ;>L8&m)R5  
 else if(id==ID_EXIT) 0ckmHv  
  OnCancel(); P@f#DX )  
 return FALSE; "}wO<O6[  
} vK[%c A"  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Ctn 4q'Q  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) z:$ibk4#h  
 AddIcon(); hO&_VCk  
 return res; TEh.?  
} #4lIna%VX  
p_(En4QSH  
void CCaptureDlg::AddIcon() rlGv6)vb  
{ -7]j[{?w  
 NOTIFYICONDATA data; )$1>6C\  
 data.cbSize=sizeof(NOTIFYICONDATA); T2/:C7zL  
 CString tip; a+cDH  
 tip.LoadString(IDS_ICONTIP); gb|;]mk*"  
 data.hIcon=GetIcon(0); IxS%V31  
 data.hWnd=GetSafeHwnd(); iPCCTs  
 strcpy(data.szTip,tip); 7~F~'V  
 data.uCallbackMessage=IDM_SHELL; xQ7U$QF|]  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; "l9aBBiu  
 data.uID=98; 1. +6x4%rV  
 Shell_NotifyIcon(NIM_ADD,&data); BjagG/ sX  
 ShowWindow(SW_HIDE); +'-.c"  
 bTray=TRUE; @"MQ6u G>  
} [8^q3o7n  
pu+Q3NfR  
void CCaptureDlg::DeleteIcon() aWlIq(dU  
{ EwX{i}j_V  
 NOTIFYICONDATA data; w]yVNB  
 data.cbSize=sizeof(NOTIFYICONDATA); B~7!v${  
 data.hWnd=GetSafeHwnd(); oda,  
 data.uID=98; KbtV>  
 Shell_NotifyIcon(NIM_DELETE,&data); M;,$ )>P  
 ShowWindow(SW_SHOW); ]gg(Z!|iQ  
 SetForegroundWindow(); (wM` LE(Ks  
 ShowWindow(SW_SHOWNORMAL); b0YEIV<$  
 bTray=FALSE; Y)DX   
} =u?aP}zc  
o.Rv<a5.L  
void CCaptureDlg::OnChange() 6[4VbIBSI  
{ QxdC[t$Lp  
 RegisterHotkey(); B ~N3k  
} Qj;{Z*l%+  
Z#L4n#TT  
BOOL CCaptureDlg::RegisterHotkey() V^&*y+  
{ 5.oIyC^Ik  
 UpdateData(); e1LIk1`p  
 UCHAR mask=0; i/%l B  
 UCHAR key=0; (or"5}\6-  
 if(m_bControl) R6O v  
  mask|=4; [#q]B=JB  
 if(m_bAlt) -PAEJn5$O  
  mask|=2; |Ia9bg'1U  
 if(m_bShift) p/?o^_s  
  mask|=1; 3_Xu3hNH!  
  key=Key_Table[m_Key.GetCurSel()]; >>,G3/Zd*  
 if(bRegistered){ F{!pii5O9  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); w\YS5!P,V  
  bRegistered=FALSE; ,d,2Q  
 } 8ZVQM7O  
 cMask=mask; a \1QnCy  
 cKey=key; %Qlc?Wl:  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); M|K^u.4  
 return bRegistered; h7!O K  
} %z-*C'j5H  
HyU:BW;  
  四、小结 p>;@]!YWQ  
=I546($  
  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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