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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: #m7evb5eg*  
  sn[<Lq  
  一、实现方法 QWm g#2'  
Rz>@G>b:  
  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: p*$=EomY  
Rwj 3o  
#pragma data_seg("shareddata") 1N]-WCxQ  
HHOOK hHook =NULL; //钩子句柄 )MN6\v  
UINT nHookCount =0; //挂接的程序数目 ~E DO< O>3  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 `aMnTF5:  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 !+hw8@A  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey /$qB&OWJn  
static int KeyCount =0; 0^P9)<k'  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 A@.ruG$  
#pragma data_seg() *Q [%r  
t P' ._0n0  
  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。 *Q -uE  
H5FWk  
  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: S2I{?y&K  
V-%jSe<  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR o9D#d\G  
cKey,UCHAR cMask) nm|"9|/  
{ OlW5k`B  
 BOOL bAdded=FALSE; 5?#AS#TD'  
 for(int index=0;index<MAX_KEY;index++){ .Pe^u%J6F  
  if(hCallWnd[index]==0){ `sdbo](76  
   hCallWnd[index]=hWnd; U z)G Y  
   HotKey[index]=cKey; U&+lw=  
   HotKeyMask[index]=cMask; OJ\j6owA  
   bAdded=TRUE; a$11u.\q+  
   KeyCount++; p|>/Hz1v  
   break; }z-)!8vF  
  } kzKQ5i $G  
 } gU@.IOg  
 return bAdded; KmF+3g~#s  
} k V'0rb  
//删除热键 z\J#d 1e  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &C/,~pJ1S  
{ Ip,0C8T`Q  
 BOOL bRemoved=FALSE; K]U8y$^  
 for(int index=0;index<MAX_KEY;index++){ tdi}P/x  
  if(hCallWnd[index]==hWnd){ ,-1taS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }WNgKw  
    hCallWnd[index]=NULL; ]waCYrG<sY  
    HotKey[index]=0; oM}P Wf-  
    HotKeyMask[index]=0; / vzwokH  
    bRemoved=TRUE; rYyEs I#qo  
    KeyCount--; g3w-Le&T  
    break; s\ ]Rgi>w  
   } _l]rt  
  } W<H^V"^  
 } ra\2BS)X  
 return bRemoved; &2Cu"O'.i  
} 0j-;4>p  
4mWT"T-8  
q'[yYPDX5x  
  DLL中的钩子函数如下: K@=_&A!  
-QydUr/(o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5~omZ,qe  
{ J$Ba*`~!!  
 BOOL bProcessed=FALSE; 4[LzjC  
 if(HC_ACTION==nCode) /#4BUfY f  
 { A.S:eQvS%  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 q1M16qv5  
   switch(wParam) CY8=prC  
   {  HuL9' M  
    case VK_MENU: L5>.ku=T  
     MaskBits&=~ALTBIT;  gY@$g  
     break; ,OO0*%  
    case VK_CONTROL: kasx4m]^  
     MaskBits&=~CTRLBIT; _i&awm/U  
     break; OY#=s!] M  
    case VK_SHIFT: S$fCO$bU  
     MaskBits&=~SHIFTBIT; ^sVB:?  
     break; T EqCoeR  
    default: //judge the key and send message aSNTm8SYX  
     break; |(1z ?Spbe  
   } N|WR^MQD  
   for(int index=0;index<MAX_KEY;index++){ Y]1b3 9O  
    if(hCallWnd[index]==NULL) )e:u 6]  
     continue; uJHf6Ye  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) YR/rN,  
    { n&uD=-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @k2nID^>  
     bProcessed=TRUE; }3mIj<I1;  
    } ]2B=@V t,  
   } E2{SKIUm  
  } yn5yQ;  
  else if((lParam&0xc000ffff)==1){ //有键按下 &mp@;wI6@  
   switch(wParam) 1=%\4\  
   { -J*jW N!  
    case VK_MENU: VFwp .1oa!  
     MaskBits|=ALTBIT; 6tmn1:  
     break; z+B"RV  
    case VK_CONTROL: <P1sK/IZb  
     MaskBits|=CTRLBIT; CVBy&o"6A  
     break; +-OqO3R  
    case VK_SHIFT: . B9rG~  
     MaskBits|=SHIFTBIT; wrW768WR  
     break; j"8|U E  
    default: //judge the key and send message t.oP]_mI  
     break; q6v%HF-q4  
   } +3n07d  
   for(int index=0;index<MAX_KEY;index++){ 2s@<k1EdPl  
    if(hCallWnd[index]==NULL) ZMXIKN9BF#  
     continue; JB= L\E}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u=h/l!lR  
    { W.u}Q@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); vL7 JzSU_  
     bProcessed=TRUE; LHz-/0 [  
    } HGpj(U:`c  
   } "(rG5z3P  
  } q\g|K3V)  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 <ibEo98  
   for(int index=0;index<MAX_KEY;index++){ L?e N(L  
    if(hCallWnd[index]==NULL) %<w)#eV?  
     continue; ']ussFaQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `PR)7}/<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); aJ1<X8  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 n089tt=TE  
   } z@3t>k|K  
  } 7Z/KXc[b  
 } =F5(k(Ds  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [,TuNd  
} e 03q9(  
Q}M% \v  
  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: r0)X]l7  
#;6YADk2_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); g2v 0!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?_9A`LC*  
kN*,3)T;}  
  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: J!,<NlP0K  
w QX,a;Br  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Rb~NX  
{ Vn-y<*np  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ;V~[kF=t0  
 { c _li.]P  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 \ueo^p]_?  
  SaveBmp(); pAo5c4y!4  
  return FALSE; c} GH|i  
 } W"_")V=QBz  
 …… //其它处理及默认处理 J]A!>|Ic  
} -Fe) )Y'=  
2R2ws.}  
E hROd  
  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。 r_f?H@v  
3U0>Y%m|,  
  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。  3%G>TB  
0m^(|=N-  
  二、编程步骤 [wJM=` !W  
MV<2x7S  
  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"; 1>1&NQ#}  
Ap{p_~~iJ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; a'zf8id  
=Vv"\p8  
  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; >M\3tB2C  
E {$Jk]c  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 90o G+T4  
>i%{5d  
  5、 添加代码,编译运行程序。 xn'&TQo0  
_h2axXFhT  
三、程序代码 WKib$(%f6  
@Q;%hb  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL \Q"j^4   
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) I dsPB)k_  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Qx-/t9`!Z  
#if _MSC_VER > 1000 "/e:V-W   
#pragma once z  %Ty;  
#endif // _MSC_VER > 1000 *E0dCY$  
#ifndef __AFXWIN_H__ /*)zQ?N  
#error include 'stdafx.h' before including this file for PCH ~.?,*q7  
#endif pPSmSWD?  
#include "resource.h" // main symbols =ILE/ pC-|  
class CHookApp : public CWinApp *"\QR>n   
{ ]uN}n;`12  
 public: r%*,pN7O  
  CHookApp(); uz6S7I  
  // Overrides S: IhJQ4K  
  // ClassWizard generated virtual function overrides cRm+?/  
  //{{AFX_VIRTUAL(CHookApp) $[L~X M  
 public: -\OvOkr  
  virtual BOOL InitInstance(); C:+-T+m[  
  virtual int ExitInstance(); \a+.~_iL|  
  //}}AFX_VIRTUAL 5\MCk"R!  
  //{{AFX_MSG(CHookApp) >YwvM=b"V  
  // NOTE - the ClassWizard will add and remove member functions here. ztcV[{[g  
  // DO NOT EDIT what you see in these blocks of generated code ! n.&z^&$w\)  
  //}}AFX_MSG K}e %E&|>  
  DECLARE_MESSAGE_MAP() &eL02:[  
}; $9!2c/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ^Oy97Y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1]Q;fe  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); N8!V%i?  
BOOL InitHotkey(); F<K;tt  
BOOL UnInit(); cI~uI '  
#endif z']TRjDbT  
3mI(5~4A]?  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. tI42]:z  
#include "stdafx.h" -? _#Yttu  
#include "hook.h" >/@wht4- j  
#include <windowsx.h> Ah5`Cnv  
#ifdef _DEBUG -][~_Hd{  
#define new DEBUG_NEW SvZ~xTit  
#undef THIS_FILE ^O#>LbM"x  
static char THIS_FILE[] = __FILE__; M3m!u[6|  
#endif N~rA/B]T  
#define MAX_KEY 100 0!<qfT a  
#define CTRLBIT 0x04 TR;"&'#k  
#define ALTBIT 0x02 or~2r8  
#define SHIFTBIT 0x01 LhN?j5XqM  
#pragma data_seg("shareddata") #|<\q*<  
HHOOK hHook =NULL; ME.l{?v  
UINT nHookCount =0; kj_MzgC'?  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey  .dA_}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT @d&(*9Y  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey s!WGs_1@  
static int KeyCount =0;  GtR!a  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 7Gwn,&)  
#pragma data_seg() "DN0|%`M/  
HINSTANCE hins; ='!E;  
void VerifyWindow(); muh[wo  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) uDhe )  
//{{AFX_MSG_MAP(CHookApp) ENZjRf4  
// NOTE - the ClassWizard will add and remove mapping macros here. -|K^!G  
// DO NOT EDIT what you see in these blocks of generated code! :1>h,NKC>  
//}}AFX_MSG_MAP ;a"g<v  
END_MESSAGE_MAP() Yatd$`,hW  
b 6kDkE  
CHookApp::CHookApp() s7(NFX5  
{ } Xbmb8  
 // TODO: add construction code here, j<"@ Y7  
 // Place all significant initialization in InitInstance /e/%mo  
} k P]'  
3jSt&+  
CHookApp theApp; I+08tXO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) pco:]3BF6  
{ G>siyUh  
 BOOL bProcessed=FALSE; B*0TM+  
 if(HC_ACTION==nCode) /b&ka&|t  
 { Dj?84y  
  if((lParam&0xc0000000)==0xc0000000){// Key up l k~VvRq  
   switch(wParam) !wbO:py[8>  
   { O*Gg57a  
    case VK_MENU: s2Z'_r T  
     MaskBits&=~ALTBIT; #:B14E  
     break; 4S%s=v w  
    case VK_CONTROL: _3Kow{y\  
     MaskBits&=~CTRLBIT; Q y4eDv5  
     break; 6d7E@}<  
    case VK_SHIFT: 58[=.rzD  
     MaskBits&=~SHIFTBIT; .rPg  
     break; xUW\P$  
    default: //judge the key and send message k)j6rU  
     break; ={'3j  
   } -!@]z2uU  
   for(int index=0;index<MAX_KEY;index++){ p!oO}gE  
    if(hCallWnd[index]==NULL) a/wg%cWG_  
     continue; .(J~:U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7)RDu,fx  
    { Dj9 v9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); D02'P{  
     bProcessed=TRUE; YCPU84f  
    } wH?]kV8Q  
   } aB_~V h  
  } > J.q3  
  else if((lParam&0xc000ffff)==1){ //Key down *XUJv&ZN  
   switch(wParam) 'zJBp 9a%  
   { :9H`O!VF  
    case VK_MENU:  !n`9V^`  
     MaskBits|=ALTBIT; 7MbV|gM}  
     break; i C)+5L#'  
    case VK_CONTROL: |*fi!nvk@  
     MaskBits|=CTRLBIT; dI(1L~  
     break; K#%@4]jO3  
    case VK_SHIFT: C.|.0^5  
     MaskBits|=SHIFTBIT; =67ab_V  
     break; &0*7]Wo*  
    default: //judge the key and send message 5'<J@3B  
     break; I]@QhCm0  
   } p=XEMVqm  
   for(int index=0;index<MAX_KEY;index++)  .u3;  
   { po! [Nd&"  
    if(hCallWnd[index]==NULL) "cZ){w  
     continue;  *KV^ X(/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >sm~te$5  
    { w,T-vf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); g+j\wvx0  
     bProcessed=TRUE; S4S}go*G[  
    } XQ'$J_hC  
   } 9]L4`.HM  
  } \? n<UsI  
  if(!bProcessed){ u5.zckV  
   for(int index=0;index<MAX_KEY;index++){ Leu6kPk  
    if(hCallWnd[index]==NULL) oA*88c+{f  
     continue; A(D>Zh6o@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) u?4d<%5R!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); @?n~v^  
   } r1&eA%eh  
  } {i<L<Y(3  
 } |4C5;"Pc  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <YM!K8hu$  
} P<CPA7K  
2RU/oqmR  
BOOL InitHotkey() ~v@.YJoZ4Z  
{ wzj :PS  
 if(hHook!=NULL){ HIq e~Vc  
  nHookCount++; V.e30u5  
  return TRUE; J[{ R:l\  
 } ;S9 z@`a.  
 else X Z=%XB:?  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); M?00n< vM  
  if(hHook!=NULL) =B{B ?B"r  
   nHookCount++; =TGa\iclpB  
  return (hHook!=NULL); B)x^S >  
} Yc:>Yzj(z  
BOOL UnInit() +ovT?CM o  
{ yRivf.wH  
 if(nHookCount>1){ s-4qK(ml-  
  nHookCount--; 0}` 0!Kv  
  return TRUE; k?}y@$[)  
 } z%;_h-  
 BOOL unhooked = UnhookWindowsHookEx(hHook); mhMTn*9  
 if(unhooked==TRUE){ ?BX}0RWMh7  
  nHookCount=0; #~o<9O  
  hHook=NULL; '=+gwe M  
 } $3S`A]xO  
 return unhooked; U]&/F{3 im  
} -bgj<4R$p  
G '%ZPh89  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) u f1s}/M  
{ ~J0r%P  
 BOOL bAdded=FALSE; t~|`RMn"  
 for(int index=0;index<MAX_KEY;index++){ ?@^gpVK{  
  if(hCallWnd[index]==0){ BS2'BS8  
   hCallWnd[index]=hWnd; 6"9(ce KX  
   HotKey[index]=cKey; K}DrJ/s  
   HotKeyMask[index]=cMask; \8)FVpS  
   bAdded=TRUE; . )E1|U[L  
   KeyCount++; (~NR."s;  
   break; OD~yIV  
  } dn&4 84  
 } :7*9W|e  
 return bAdded; U J uz  
} ezA&cZ5  
,b<m],p  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) mYqLqezAA  
{ On(.(7sNc  
 BOOL bRemoved=FALSE; yb-4[C:i  
 for(int index=0;index<MAX_KEY;index++){ @zJiR{Je-U  
  if(hCallWnd[index]==hWnd){ wn.UjxX.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \"X_zM  
    hCallWnd[index]=NULL; @ %o'  
    HotKey[index]=0; !Ld[`d.|R!  
    HotKeyMask[index]=0; },;Z<(  
    bRemoved=TRUE; [M#(su0fv  
    KeyCount--; )=!|^M  
    break; g)}q3-<AK>  
   } P\h1%a/D  
  } oz%{D@CF  
 } vCn~- Q  
 return bRemoved; E;YD5^B  
} z%nplG'~|  
KuF>2KX~Y  
void VerifyWindow() lSy_cItF  
{ " eS-i@  
 for(int i=0;i<MAX_KEY;i++){ Z?qc4Cg  
  if(hCallWnd!=NULL){ lpjby[S  
   if(!IsWindow(hCallWnd)){ vcZ"4%w  
    hCallWnd=NULL; Y=/;7T  
    HotKey=0; 4m%Yck{R  
    HotKeyMask=0; s6DPb_,  
    KeyCount--; 9fYof  
   } +1K= ]#a  
  } !FQS9SoO9  
 } O' Mma5  
} @P">4xVX{  
4 g8t  
BOOL CHookApp::InitInstance() 8\+XtS  
{ <.ZD.u  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Z^.qX\<M  
 hins=AfxGetInstanceHandle(); (rQ)0g@  
 InitHotkey(); `j'gt&  
 return CWinApp::InitInstance(); Bw.?Me)mf|  
} D7Ds*X`!l  
g(R!M0hdF  
int CHookApp::ExitInstance() 'X~CrgQl  
{ 1i#U&  
 VerifyWindow(); Gw#z:gX2  
 UnInit(); {5SJ0'.B2g  
 return CWinApp::ExitInstance(); 5*O]`Q7  
} Mn*5oH  
uFG ;AY|  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 0xV[C4E[6  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 9 1ec^g  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ y(j vl|z[  
#if _MSC_VER > 1000 i x_a  
#pragma once jF{)2|5  
#endif // _MSC_VER > 1000 U8eU[|-8O/  
fK{Z{)D  
class CCaptureDlg : public CDialog b{,vZhP-  
{ j?(@x>HA  
 // Construction .p'\@@o5  
 public: #B__-"cRv  
  BOOL bTray; 7 .xejz  
  BOOL bRegistered; 7??j}ob>  
  BOOL RegisterHotkey(); ( `d_DQ  
  UCHAR cKey; ah!fQLMH  
  UCHAR cMask; /4 .]L~  
  void DeleteIcon(); 9$^v*!<z\  
  void AddIcon(); KA."[dVa  
  UINT nCount; +}C M2>M  
  void SaveBmp(); G 'CYvV  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor %sS7o3RW\  
  // Dialog Data zU# OjvNk  
  //{{AFX_DATA(CCaptureDlg) KvEZbf 3f  
  enum { IDD = IDD_CAPTURE_DIALOG }; Ifj%"RI  
  CComboBox m_Key; t`0(5v  
  BOOL m_bControl; ^ |>)H  
  BOOL m_bAlt; wtQ(R4  
  BOOL m_bShift; TZ:dY x  
  CString m_Path; EU()Nnm2  
  CString m_Number; ?D]T| =EZY  
  //}}AFX_DATA u &{|f  
  // ClassWizard generated virtual function overrides %/wfYRp*  
  //{{AFX_VIRTUAL(CCaptureDlg) 9z(h8H  
 public: m A|"  
  virtual BOOL PreTranslateMessage(MSG* pMsg); tHo/Vly6Z  
 protected: (z'!'?v;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ec['k&*7,  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 3M{b:|3/q  
  //}}AFX_VIRTUAL s`,.&  
  // Implementation fQ,(,^!;  
 protected: 9'!I6;M  
  HICON m_hIcon; 4\Cb4jq%/  
  // Generated message map functions [mQ*];GA  
  //{{AFX_MSG(CCaptureDlg) ^Cn_ ODjo  
  virtual BOOL OnInitDialog(); 7h.:XlUm|  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); }u~r.=  
  afx_msg void OnPaint(); y{\(|j  
  afx_msg HCURSOR OnQueryDragIcon(); }{e7wqS$&,  
  virtual void OnCancel(); G$ Ii  
  afx_msg void OnAbout();  \4&FW|mx  
  afx_msg void OnBrowse(); k N$L8U8f  
  afx_msg void OnChange(); ,lw<dB@7"5  
 //}}AFX_MSG XJf1LGT5  
 DECLARE_MESSAGE_MAP() }UHoa  
}; B9h>  
#endif   S?m4  
0}aw9g  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file +luW=j0V  
#include "stdafx.h" "O{:jfq  
#include "Capture.h" ^ P=CoLFa  
#include "CaptureDlg.h" HUY1nb=  
#include <windowsx.h> z/7"!  
#pragma comment(lib,"hook.lib") L QP4#7  
#ifdef _DEBUG [es-&X07<  
#define new DEBUG_NEW yO0 9NQ 5u  
#undef THIS_FILE &MF%zJ6  
static char THIS_FILE[] = __FILE__; 5P <  F  
#endif !yX4#J(  
#define IDM_SHELL WM_USER+1 pmi`Er  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); mH09* Z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %D}]Z=gp  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ?28aEX_w  
class CAboutDlg : public CDialog 4S#q06=Xe  
{ !P b39[f  
 public: 'D;'Pr]  
  CAboutDlg(); dKTUW<C  
  // Dialog Data p uLQ_MNV  
  //{{AFX_DATA(CAboutDlg) ;/-#oW@gQ  
  enum { IDD = IDD_ABOUTBOX }; `F1 ( v  
  //}}AFX_DATA ;u: }rA)  
  // ClassWizard generated virtual function overrides SwPc<Z?P  
  //{{AFX_VIRTUAL(CAboutDlg) 79Vp^GG7  
 protected: @Y2&v956  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r`(U3EgP  
  //}}AFX_VIRTUAL t^1c^RpTb  
  // Implementation {pNf& '  
 protected: dq ~=P>  
  //{{AFX_MSG(CAboutDlg) c\pPwG  
  //}}AFX_MSG l~Sn`%PgA  
  DECLARE_MESSAGE_MAP() k"2xyzt*  
}; s*DDO67\W  
Zcn,_b7  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) oXkxd3  
{ *n %J#[e(  
 //{{AFX_DATA_INIT(CAboutDlg) Ju7nvxC  
 //}}AFX_DATA_INIT ?#917M  
} ;1 02ddRV  
(P N!k0Y  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 0Ie9T1D=  
{ .v:K`y;f\(  
 CDialog::DoDataExchange(pDX); ]%5DuE\M8\  
 //{{AFX_DATA_MAP(CAboutDlg) W=EvEx^?%  
 //}}AFX_DATA_MAP X pd^^  
} ii@O&g  
DOm5azO!>  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) TBYRY)~f  
 //{{AFX_MSG_MAP(CAboutDlg) Pc4FEH/  
 // No message handlers glppb$oB\  
 //}}AFX_MSG_MAP G&Sp }  
END_MESSAGE_MAP() RT)*H>|  
' cl&S:  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 5? s$(Lt~  
: CDialog(CCaptureDlg::IDD, pParent) V/G'{ q  
{ nEM>*;iE   
 //{{AFX_DATA_INIT(CCaptureDlg) vWwnC)5  
  m_bControl = FALSE; fH7o,U|  
  m_bAlt = FALSE; u F T&r|  
  m_bShift = FALSE; \i=,[8t[r  
  m_Path = _T("c:\\"); !%?X% @9  
  m_Number = _T("0 picture captured."); WeTsva+  
  nCount=0; -)tu$W*  
  bRegistered=FALSE; r='"X#CmV/  
  bTray=FALSE; dviL5Eaj  
 //}}AFX_DATA_INIT mu/O\'5  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 aMFUJrXo  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~sQN\]5VW  
} ;?i(WV}ee  
YQ _3[[xT  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) y$At$i>u  
{ XY8s\DK  
 CDialog::DoDataExchange(pDX); 5u\si4BL{  
 //{{AFX_DATA_MAP(CCaptureDlg) Wb"*9q06  
  DDX_Control(pDX, IDC_KEY, m_Key); !#nlWX :~  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Rt<8 &.m4  
  DDX_Check(pDX, IDC_ALT, m_bAlt); t "J"G@1)  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); zZ|Si  
  DDX_Text(pDX, IDC_PATH, m_Path); 1;[\xqJ  
  DDX_Text(pDX, IDC_NUMBER, m_Number); qlSc[nEk  
 //}}AFX_DATA_MAP DH_Mll>  
} Vet7a_  
"K z=Z C  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 2Ek6YNx  
//{{AFX_MSG_MAP(CCaptureDlg) 2hRaYX,g  
 ON_WM_SYSCOMMAND() EIwTx:{F  
 ON_WM_PAINT() g@.RfX=  
 ON_WM_QUERYDRAGICON() #"a?3!wr  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) }xHoitOD  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ~:f9,  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 9psX"*s  
//}}AFX_MSG_MAP *Ri?mEv hF  
END_MESSAGE_MAP() .foM>UOY  
' @M  
BOOL CCaptureDlg::OnInitDialog() >yn%.Uoh@  
{ d9[*&[2J|  
 CDialog::OnInitDialog(); 0!rU,74I=  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); H'$g!Pg  
 ASSERT(IDM_ABOUTBOX < 0xF000);  XGEAcN  
 CMenu* pSysMenu = GetSystemMenu(FALSE); !p1OBS|  
 if (pSysMenu != NULL) Gv}*T w$  
 { Pt?]JJxl-  
  CString strAboutMenu; RR><so%  
  strAboutMenu.LoadString(IDS_ABOUTBOX); J56+eC(  
  if (!strAboutMenu.IsEmpty()) B3'qmi<  
  { @xW)&d\'  
   pSysMenu->AppendMenu(MF_SEPARATOR); ,ORZtj  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); u7&r'rZ1_!  
  } y5.Z<Y  
 } 46*o_A,"  
 SetIcon(m_hIcon, TRUE); // Set big icon m~#S76!w  
 SetIcon(m_hIcon, FALSE); // Set small icon '!Vn  
 m_Key.SetCurSel(0); *~M=2Fj;i  
 RegisterHotkey(); `|i #)  
 CMenu* pMenu=GetSystemMenu(FALSE); ` &|Rs  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); z?h\7 R  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); J}TS-j0  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ;k/y[ x}  
 return TRUE; // return TRUE unless you set the focus to a control )__vPPko i  
} F$ x@ ]  
&Hc8u,|  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) GdR>S('  
{ 9'Y~! vY  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) FqQm *k_  
 { SZ~Ti|^  
  CAboutDlg dlgAbout; LDW":k|  
  dlgAbout.DoModal(); A7 .C  
 } t qbS!r  
 else 'rRo2oTN  
 { rOB-2@-  
  CDialog::OnSysCommand(nID, lParam); xzy7I6X  
 } ,Vt7Kiu  
} '  G-]>  
c}Y(Myd  
void CCaptureDlg::OnPaint() UMo=bs  
{ &6PZX0M  
 if (IsIconic()) N6$pOQ  
 { oGly|L>  
  CPaintDC dc(this); // device context for painting >f19P+  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ;Mc\>i/  
  // Center icon in client rectangle 75@){ :  
  int cxIcon = GetSystemMetrics(SM_CXICON); !~m)_Q5?~  
  int cyIcon = GetSystemMetrics(SM_CYICON); tk<dp7y7  
  CRect rect; -Duy: C6W  
  GetClientRect(&rect); 2<yi8O\  
  int x = (rect.Width() - cxIcon + 1) / 2; P`5@$1CJ  
  int y = (rect.Height() - cyIcon + 1) / 2; A(W%G|+  
  // Draw the icon > z h  
  dc.DrawIcon(x, y, m_hIcon); ]o_Z3xXUa  
 } ;) 5d wq  
 else hv}rA,Yd  
 { #wNksh/J^  
  CDialog::OnPaint(); n%3rv?m7  
 } 2JYyvJ>  
} /Bid:@R  
. 3=WE@M  
HCURSOR CCaptureDlg::OnQueryDragIcon() y^pk)`y8  
{ RhnSQe  
 return (HCURSOR) m_hIcon; -$?xR](f  
} n(/(F `  
x$J1%K*  
void CCaptureDlg::OnCancel() jB:$+k|~.  
{ *&+e2itmp  
 if(bTray) 5iz]3]}%  
  DeleteIcon(); IBcCbNs!  
  CDialog::OnCancel(); kUmrJBh$  
} OlK3xdg7  
~+A?!f;-J  
void CCaptureDlg::OnAbout() 2Auhv!xV  
{ PSI5$Vna4p  
 CAboutDlg dlg; dZIAotHN:  
 dlg.DoModal(); +b.<bb6  
} (LA%q6  
JaXT B"e  
void CCaptureDlg::OnBrowse() 75r>~@)*  
{  VljAAt  
 CString str; @R_a'v-  
 BROWSEINFO bi; 4v33{sp  
 char name[MAX_PATH]; wxkCmrV  
 ZeroMemory(&bi,sizeof(BROWSEINFO));  nk>  
 bi.hwndOwner=GetSafeHwnd(); 3DV';  
 bi.pszDisplayName=name; .|JJyjRA+  
 bi.lpszTitle="Select folder"; v98=#k!F  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; =GL}\I  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); cZ k? o  
 if(idl==NULL) 8E&}+DR?  
  return; o=_:g >5  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); T,@.RF  
 str.ReleaseBuffer(); 68Vn]mr#  
 m_Path=str; 6B)(kPW  
 if(str.GetAt(str.GetLength()-1)!='\\') ~.u}v~ F  
  m_Path+="\\"; T(MS,AyD]  
 UpdateData(FALSE); Sav]Kxq{  
} ,G!M?@Q  
P(_D%0xKm  
void CCaptureDlg::SaveBmp() &dh%sFy  
{ n`2 d   
 CDC dc; 81eDN6 M\  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); nW3-)Q89  
 CBitmap bm; yMq&9R9F  
 int Width=GetSystemMetrics(SM_CXSCREEN); UQ:H3  
 int Height=GetSystemMetrics(SM_CYSCREEN); ;o8C(5xE|  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ,=O`'l >K  
 CDC tdc; =${]j  
 tdc.CreateCompatibleDC(&dc); h$)(-_c3  
 CBitmap*pOld=tdc.SelectObject(&bm); ah1d0e P  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); G+stt(k:  
 tdc.SelectObject(pOld); k<Z^93 S  
 BITMAP btm; @*]l.F   
 bm.GetBitmap(&btm); ^ llZf$`  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {E-.W"t4  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); "XT7;!  
 BITMAPINFOHEADER bih; 0; 2i"mzS\  
 bih.biBitCount=btm.bmBitsPixel; :'91qA%Wr  
 bih.biClrImportant=0; D*6v.`]X  
 bih.biClrUsed=0; mcy\nAf5%  
 bih.biCompression=0; L3JFQc/oh~  
 bih.biHeight=btm.bmHeight; a|SgGtBtT4  
 bih.biPlanes=1; Rq )&v*=  
 bih.biSize=sizeof(BITMAPINFOHEADER); QG*=N {% 5  
 bih.biSizeImage=size; 'A;G[(SYy  
 bih.biWidth=btm.bmWidth; `uM:>  
 bih.biXPelsPerMeter=0; &PaqqU.  
 bih.biYPelsPerMeter=0; dF:@BEo  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); QO0}-wZR  
 static int filecount=0; DZ92;m  
 CString name; &)JQ6J_|\  
 name.Format("pict%04d.bmp",filecount++); =.(yOUI  
 name=m_Path+name; >A5R  
 BITMAPFILEHEADER bfh; %@#+Xpa+  
 bfh.bfReserved1=bfh.bfReserved2=0; ^hzlR[  
 bfh.bfType=((WORD)('M'<< 8)|'B'); U`N|pPe:w  
 bfh.bfSize=54+size; a yn6k=F  
 bfh.bfOffBits=54; \ T/i]z  
 CFile bf; nDu f<mw  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ^E\{&kaUp  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Qz\yoI8JA,  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 8] skAh  
  bf.WriteHuge(lpData,size); [bk2RaX:i  
  bf.Close(); ^u&oS1U  
  nCount++; oW(lQ'"  
 } gyj.M`+y  
 GlobalFreePtr(lpData); zI$^yk-vn  
 if(nCount==1) &E0L7?l  
  m_Number.Format("%d picture captured.",nCount); 6E/>]3~!  
 else wwrP7T+d  
  m_Number.Format("%d pictures captured.",nCount); dE19_KPm[j  
  UpdateData(FALSE); "[2CV!_  
} l*>t@:2J  
'KB\K)cD=3  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 6zh<PETa03  
{ lffp\v{w  
 if(pMsg -> message == WM_KEYDOWN) wI><kdz  
 { T6m#sVq  
  if(pMsg -> wParam == VK_ESCAPE) (DJLq  
   return TRUE; :Rv ?>I j  
  if(pMsg -> wParam == VK_RETURN) r8g4NsRVtv  
   return TRUE; ;iR( Ir  
 } tvXoF;Yq  
 return CDialog::PreTranslateMessage(pMsg); I$/*Pt];  
} ^]l^q'?>:  
PPk\W7G  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <~;;iM6  
{ :f%FM&b  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ D X GClH  
  SaveBmp(); ,Tc3koi  
  return FALSE; oJa6)+b(3  
} j[l6&eX  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ xFxl9oM."  
 CMenu pop; WA}<Zme3[  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); _J(n~"eR  
 CMenu*pMenu=pop.GetSubMenu(0); cpvN }G  
 pMenu->SetDefaultItem(ID_EXITICON); 9<u^.w  
 CPoint pt; @Gp=9\L  
 GetCursorPos(&pt); ?PVJeFH  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Mx<z34(T  
 if(id==ID_EXITICON) ]T|9>o!  
  DeleteIcon(); Xou1X$$z  
 else if(id==ID_EXIT) [p[nK=&r  
  OnCancel(); j(^ot001%v  
 return FALSE; (Cjnf a 2  
} ^7M hnA  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); KiW4>@tY  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) e~R; 2bk  
 AddIcon(); .{sKEVK  
 return res; *z[G+JX  
} XndGe=O  
>2h|$6iWP  
void CCaptureDlg::AddIcon() 0q'd }DW  
{ L[l ?}\  
 NOTIFYICONDATA data; rMXIw  
 data.cbSize=sizeof(NOTIFYICONDATA); 'f&o%5]  
 CString tip; RrrW0<Ed  
 tip.LoadString(IDS_ICONTIP); r@N 0%JZZ  
 data.hIcon=GetIcon(0); j !^Tw.Ty  
 data.hWnd=GetSafeHwnd(); "<o[X ?u  
 strcpy(data.szTip,tip); M S 3?#b  
 data.uCallbackMessage=IDM_SHELL; +Go(y S  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; :$k':0 n  
 data.uID=98; .N2yn`  
 Shell_NotifyIcon(NIM_ADD,&data); HR)Dz~Obw  
 ShowWindow(SW_HIDE); 5\93-e  
 bTray=TRUE; s2f9 5<B  
} )"k>}&'  
lyGQ6zlSn  
void CCaptureDlg::DeleteIcon() 79 zFF  
{ 0#(K}9T)  
 NOTIFYICONDATA data; uC\FW6K=m  
 data.cbSize=sizeof(NOTIFYICONDATA); dmh6o *  
 data.hWnd=GetSafeHwnd(); u8ofgcFYE  
 data.uID=98; ^0"^Xk*  
 Shell_NotifyIcon(NIM_DELETE,&data); T}} 0hs;  
 ShowWindow(SW_SHOW); N]n]7(e+0C  
 SetForegroundWindow(); i9Fg  
 ShowWindow(SW_SHOWNORMAL); p@epl|IZp  
 bTray=FALSE; 50!/%  
} w-2&6o<n-  
QZy+`  
void CCaptureDlg::OnChange() |GuIp8~  
{ RmS|X"zc  
 RegisterHotkey(); Z(Da?6#1  
} +pYrAqmO-  
F) w.q  
BOOL CCaptureDlg::RegisterHotkey() <p@c %e,_  
{ yXU-@~  
 UpdateData(); y,qP$ 5xiq  
 UCHAR mask=0; fR_ jYP 1  
 UCHAR key=0; GwiG..Y]&  
 if(m_bControl) HI/]s^aL  
  mask|=4; R=M"g|U6  
 if(m_bAlt) 0kN;SSX!  
  mask|=2; JA W}]:jC  
 if(m_bShift) tX;00g;U.  
  mask|=1; 4d&#NP  
  key=Key_Table[m_Key.GetCurSel()]; Pn@k)g  
 if(bRegistered){ %bI(   
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); |8I #`  
  bRegistered=FALSE; 8r '  
 } .DSn H6O  
 cMask=mask; (IX iwu  
 cKey=key; >Gbj1>C}  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); p:M#F:  
 return bRegistered; @|Z:7n6S  
} :xw2\:5~0  
O v3W;jD  
  四、小结 9k\`3SE  
=! v.VF\;  
  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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