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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: 6z-ZJ|?  
  hA'i|;|ZYc  
  一、实现方法 ^/'zU,  
1 8*M  
  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: =@e3I)D#?i  
qr$h51C&  
#pragma data_seg("shareddata") Sj=x.Tr\  
HHOOK hHook =NULL; //钩子句柄 g|STegg  
UINT nHookCount =0; //挂接的程序数目 sd5%Szx  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ??Lda='  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 4F[4H\>'  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 7'IcgTWDZy  
static int KeyCount =0; =()Vrk|uK  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 D*T*of G  
#pragma data_seg() Ms4~P6;%  
gc<w nm|  
  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。 Z;v5L/;  
'dXGd.V7u  
  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: K_SURTys  
3@}rO~  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR zD"n7;  
cKey,UCHAR cMask) rXh*nC  
{ {[I]pm~n  
 BOOL bAdded=FALSE; ey/{Z<D  
 for(int index=0;index<MAX_KEY;index++){ _%R]TlL  
  if(hCallWnd[index]==0){ { l0[`"EF  
   hCallWnd[index]=hWnd; :P'M|U  
   HotKey[index]=cKey; 1hTE^\W  
   HotKeyMask[index]=cMask; 1]&FB{l  
   bAdded=TRUE; 5>Kk>[|.  
   KeyCount++; }Qu kn  
   break; &':Ecmo~`  
  } $@Bd}35 J  
 } -v@LJCK7I  
 return bAdded; 2gasH11M  
} * \$m1g7b  
//删除热键 C%RYQpY*c  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) " ""k}M2A  
{ twWzS 4;  
 BOOL bRemoved=FALSE; * :kMv;9  
 for(int index=0;index<MAX_KEY;index++){ EvP\;7B  
  if(hCallWnd[index]==hWnd){ !VDNqW  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -P6Z[ V%  
    hCallWnd[index]=NULL; -){aBMOv3  
    HotKey[index]=0; J@}PBHK+  
    HotKeyMask[index]=0; aP ToP.e  
    bRemoved=TRUE; c0ue[tb  
    KeyCount--; TSKT6_IJw  
    break; d ug^oc1  
   } 5+DId7d'n  
  } ]&;K:#J  
 } F tS"vJ\  
 return bRemoved; P Dgd'y  
} \{EYkk0]  
pw.K,?kYr  
iJU=98q  
  DLL中的钩子函数如下: f2LiCe.?  
koojF|H>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^TZ`1:oL#  
{ ;Yve m  
 BOOL bProcessed=FALSE; agGgj>DDd  
 if(HC_ACTION==nCode) w/f?KN  
 { PjG^L FX  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 H~NK:qRzK  
   switch(wParam) 0-Ga2Go9  
   {  Y*QoD9<T?;  
    case VK_MENU: wgUgNwd1  
     MaskBits&=~ALTBIT; s-801JpiJ  
     break; LrH"d  
    case VK_CONTROL: L$z(&%Nx  
     MaskBits&=~CTRLBIT; A\w"!tNM|  
     break; h(K}N5`  
    case VK_SHIFT: ucYweXsO3  
     MaskBits&=~SHIFTBIT; B#;6z%WK  
     break; dQs>=(|t  
    default: //judge the key and send message a=4 `C*)  
     break; r_hs_n!6  
   } >ZwDcuJ~Lz  
   for(int index=0;index<MAX_KEY;index++){ o- v#Zl  
    if(hCallWnd[index]==NULL) X> T_Xc  
     continue; `iN H`:[w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Kw7uUJR  
    { [G",Yky  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); mUNAA[0 L  
     bProcessed=TRUE; XI+GWNAmJ  
    } ;(-Wc9=  
   } tc0(G~.N  
  } c6T[2Ig  
  else if((lParam&0xc000ffff)==1){ //有键按下 =D&XE*qkZ  
   switch(wParam) 5AK@e|G$w  
   { o1Krp '*  
    case VK_MENU: z2lT4SAv+  
     MaskBits|=ALTBIT; JT! Cb$!  
     break; }X/>WiGh:  
    case VK_CONTROL: Ye|(5f  
     MaskBits|=CTRLBIT; Yosfk\D  
     break; \iRmGvT  
    case VK_SHIFT: G1a56TIN~  
     MaskBits|=SHIFTBIT; j#jwK(:]  
     break; 7?;ZE:  
    default: //judge the key and send message / K(l[M  
     break; M`&78j  
   } J9/EJ'My  
   for(int index=0;index<MAX_KEY;index++){ Urz9S3#\  
    if(hCallWnd[index]==NULL) Z<iK(?@O  
     continue; .L~ NX/V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t"Bp # U1  
    { `&:>?Y/X2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); SyI\ulmL  
     bProcessed=TRUE; jmG)p|6  
    } }` YtXD-o  
   }  (l-l Y  
  } ZPG~@lU  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 7_R[ =t  
   for(int index=0;index<MAX_KEY;index++){ ?3%r:g4  
    if(hCallWnd[index]==NULL) OFxCV`>ce  
     continue; j>?`N^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ceuEsQ}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ..R JHa6B  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ? q_%  
   } A%cJ5dF8~  
  } j 8)*'T  
 } ,e^~(ITaq  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); rJ{k1H>  
} Z,DSTP\|  
R=3|(R+kA  
  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: +K s3  
|\Q2L;4C  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {PkR6.XhR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &Oc `|r*  
fR b  
  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: h$XoR0  
`-.6;T}2U  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) D_?dy4\  
{ K 6yD64  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ;jJ4H+8  
 { J|F!$m{  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 <KJ|U0/jGd  
  SaveBmp(); ^u2x26].  
  return FALSE; CTe!jMZ=  
 } }qJ`nN8  
 …… //其它处理及默认处理 F1S0C>N?5  
} lcM  
DL#y_;#3_  
@ULd~  
  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。 (-],VB (+  
IR{XL\WF  
  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。 u_}UU 2  
K^",LCJA  
  二、编程步骤 86eaX+F  
5|7<ZL 3  
  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"; k(M"k!M  
E5 #ff5  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; \<hHZS  
LLFQ5py{  
  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; * H~=dPC  
Cd ]g+R}j  
  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; :*/g~y(fE  
^ p7z3ng  
  5、 添加代码,编译运行程序。 A9KPU:  
Qp7F3,/#  
三、程序代码 YCVT0d  
/x)i}M)  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL YhzDw8f  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) iUFG!,+d  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ d+vAm3.Dg  
#if _MSC_VER > 1000 xSm~V3b c  
#pragma once s)?GscPG!  
#endif // _MSC_VER > 1000 /6F\]JwU  
#ifndef __AFXWIN_H__ \=P(?!v  
#error include 'stdafx.h' before including this file for PCH V(XZ7<& {  
#endif kT]jJbb"  
#include "resource.h" // main symbols ]0O3kiVQ  
class CHookApp : public CWinApp ,xR u74  
{ ~Q#! oh'i  
 public: E,dUO;  
  CHookApp(); #?`S+YN!q)  
  // Overrides 89j:YfA=v  
  // ClassWizard generated virtual function overrides t&p I  
  //{{AFX_VIRTUAL(CHookApp) Vc6 >i|"-O  
 public: +* F e   
  virtual BOOL InitInstance(); ?p/}eRgi  
  virtual int ExitInstance(); EM@EB< pRX  
  //}}AFX_VIRTUAL H!6+x*P0  
  //{{AFX_MSG(CHookApp) (sI`FW_  
  // NOTE - the ClassWizard will add and remove member functions here. hT,rcIkg:  
  // DO NOT EDIT what you see in these blocks of generated code ! '? -N  
  //}}AFX_MSG 5wdKu,nq  
  DECLARE_MESSAGE_MAP() P_b!^sq9  
}; w ~"%&SNN  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); [c -|`d^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s(ap~UCOw  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); h6IO;:P)  
BOOL InitHotkey(); 2.=G  
BOOL UnInit(); >$yA ,N  
#endif $-|$4lrS  
{2QP6XsJ  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. [$ uKI,l  
#include "stdafx.h" k7{|\w%  
#include "hook.h" c<lEFk!g  
#include <windowsx.h> _mk@1ft  
#ifdef _DEBUG 6tjV^sjs  
#define new DEBUG_NEW }#; .b'`  
#undef THIS_FILE K<r5jb  
static char THIS_FILE[] = __FILE__; !Eb|AHa  
#endif z,hBtq:-$  
#define MAX_KEY 100 ir>S\VT4  
#define CTRLBIT 0x04 \rATmjsKzS  
#define ALTBIT 0x02 "'GhE+>Z  
#define SHIFTBIT 0x01 G;J)[y  
#pragma data_seg("shareddata") rC]k'p2x  
HHOOK hHook =NULL; s"J)Jc  
UINT nHookCount =0; ,t;US.s([.  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey DajN1}]  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT -/0aGqY  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey n(|n=P:o  
static int KeyCount =0; ZR-64G=L,  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift UCkV ;//.  
#pragma data_seg() \{!,a  
HINSTANCE hins; KK5_;<  
void VerifyWindow(); -"{g kjuv  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 3Ijs V5a  
//{{AFX_MSG_MAP(CHookApp) G,c2?^#n  
// NOTE - the ClassWizard will add and remove mapping macros here. _~D#?cFY6  
// DO NOT EDIT what you see in these blocks of generated code! #6~Bg)7AM  
//}}AFX_MSG_MAP =9`UcTSi6p  
END_MESSAGE_MAP() (2QfH$HEk  
>qOj^WO~  
CHookApp::CHookApp() .)Pul|)d  
{ [k(b<'  
 // TODO: add construction code here, G<$8g-O;D  
 // Place all significant initialization in InitInstance D%LYQ  
} Sv0?_3C  
$.:x3TsA  
CHookApp theApp; Owgy<@C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) w El-  
{ CEBG9[|  
 BOOL bProcessed=FALSE; `m8WLj  
 if(HC_ACTION==nCode) Pa+_{9  
 { !f&hVLs0  
  if((lParam&0xc0000000)==0xc0000000){// Key up `u7^r^>A  
   switch(wParam) RHpjJZUV  
   { R*FDg;t4  
    case VK_MENU: C"mWO Y2]  
     MaskBits&=~ALTBIT; lN8l71N^  
     break; 6w(r}yO]  
    case VK_CONTROL: En#Q p3  
     MaskBits&=~CTRLBIT; _d!o,=}  
     break; $-~"G,;F  
    case VK_SHIFT: #B6f{D[pI  
     MaskBits&=~SHIFTBIT; #`f{\  
     break; ~b!la  
    default: //judge the key and send message tJn"$A ^N  
     break; 6O.kKhk  
   } (9TSH3f?  
   for(int index=0;index<MAX_KEY;index++){ Z h9D^ I  
    if(hCallWnd[index]==NULL) LH=^3Gw  
     continue; >Yk|(!v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?Yf v^DQ5  
    { 1E'PSq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,!GoFu  
     bProcessed=TRUE; PB.'huu  
    } fH?A.JP=a  
   } ~K;hXf  
  } C2\WvE%!  
  else if((lParam&0xc000ffff)==1){ //Key down 2/tx5Nc  
   switch(wParam) @iXBy:@  
   { a j$& 9][  
    case VK_MENU: ?*yB&(a:8  
     MaskBits|=ALTBIT; aI ;$N|]u  
     break; ^,t@HN;gA  
    case VK_CONTROL: GUqG1u z9  
     MaskBits|=CTRLBIT; 0!KYi_3  
     break; W,[QK~  
    case VK_SHIFT: %.]#3tW  
     MaskBits|=SHIFTBIT; tg==Qgz  
     break; 5G gH6   
    default: //judge the key and send message fA?v\'Qq/  
     break; 9E8&~y  
   } $pAVTz  
   for(int index=0;index<MAX_KEY;index++) `?WN*__["  
   { k~K;r8D/  
    if(hCallWnd[index]==NULL) S:`Gi>D  
     continue; 0s H~yvM5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sQ^t8Y 9  
    { s :BW}PM  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); x- ue1  
     bProcessed=TRUE; jpS$5Ct  
    } :8@eon}  
   } frDMFEXXP  
  } OI"g-+~  
  if(!bProcessed){ ~m,~;  
   for(int index=0;index<MAX_KEY;index++){ vr{|ubG]d  
    if(hCallWnd[index]==NULL) $w <R".4  
     continue; QRrAyRf[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Z!^>!' Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); s^IC]sW\%  
   } r\F2X J^  
  } 4b;*:C4?  
 } ]h' 38W  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _u u&?<h  
} 3N+B|WrM  
#1\`!7TO3  
BOOL InitHotkey() Bos} `S![  
{ L(u@%.S  
 if(hHook!=NULL){ IGVq`Mxj  
  nHookCount++; }!>\Ja<\  
  return TRUE; g-_=$#&{  
 } S9 $t9o  
 else `GY3H3B  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); M*D_p n&  
  if(hHook!=NULL) Tp{ jR<  
   nHookCount++; +!px+*)bW  
  return (hHook!=NULL); o<Mcc j  
} y6-P6T  
BOOL UnInit() 9&Un|cr  
{ cn/&QA"  
 if(nHookCount>1){ ~6Fh,S1?  
  nHookCount--; 8-7Ml3G*  
  return TRUE; EW vhT]<0  
 } [g<gu~  
 BOOL unhooked = UnhookWindowsHookEx(hHook); +/eJ#Xw3u8  
 if(unhooked==TRUE){ Y3FFi M[s~  
  nHookCount=0; T}1"  
  hHook=NULL; \v\ONp"  
 } tjB)-=j[  
 return unhooked; );i J9+ V}  
} ;-Os~81o?  
]3,  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) DO-M0L  
{ &08dW9H  
 BOOL bAdded=FALSE; Lb<IEy77\  
 for(int index=0;index<MAX_KEY;index++){ x|Pz24yP9  
  if(hCallWnd[index]==0){ IemhHf ^l  
   hCallWnd[index]=hWnd; GHn0(o&K  
   HotKey[index]=cKey; 9+@z:j  
   HotKeyMask[index]=cMask; ((#BU=0iK  
   bAdded=TRUE; D_$N2>I-  
   KeyCount++; DbB<8$  
   break; C9MK3vtD.  
  } Qjnh;uBO  
 } IA Ma  
 return bAdded; -AD` (b7q  
} '%ZKvZ-  
_Li.}g@Bd  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) He4HI Z  
{ 0-{E% k  
 BOOL bRemoved=FALSE; $ kHXt]fU  
 for(int index=0;index<MAX_KEY;index++){ 7t#Q8u?  
  if(hCallWnd[index]==hWnd){ V#.pi zb  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ MZf?48"f  
    hCallWnd[index]=NULL; t\ z@k9  
    HotKey[index]=0; &=M4Z/Ao  
    HotKeyMask[index]=0; .o]I^3tf c  
    bRemoved=TRUE; "M/) LXn:0  
    KeyCount--; cC/32SmY4  
    break; sq(5k+y*J  
   } r r\u)D#)  
  } tN4&#YK<  
 } Sw; kUJ  
 return bRemoved; Fq <JxamR  
} yS4VgP'W  
i M MKA0JM  
void VerifyWindow() j7a }<\  
{ _unoDoB  
 for(int i=0;i<MAX_KEY;i++){ cpw=2vnD  
  if(hCallWnd!=NULL){ ;Gn>W+Ae M  
   if(!IsWindow(hCallWnd)){ 4I2:"CK06  
    hCallWnd=NULL; pCo3%(  
    HotKey=0; 6'e^np  
    HotKeyMask=0; /AOGn?Z3  
    KeyCount--; 'm |T"Ym~  
   } bo<.pK$  
  } IgwHC0W  
 } &nVekE:!  
} D4y!l~_,%M  
+HWFoK  
BOOL CHookApp::InitInstance() FNOsw\Bo  
{ jck(cc= R  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); {g`!2"  
 hins=AfxGetInstanceHandle(); +]-'{%-zK  
 InitHotkey(); ik)u/r DW  
 return CWinApp::InitInstance(); [N~-9  
} YqWNp  
:BV$3]y  
int CHookApp::ExitInstance() nVgvn2N/  
{ ZnAQO3%y  
 VerifyWindow(); d/Wp>A@dob  
 UnInit(); GhcH"D%-  
 return CWinApp::ExitInstance(); PZ'|)  
} TJW8l[M  
5%QYe]D  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 2^Im~p~ByE  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) aZ{l6  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ I8T*_u^_  
#if _MSC_VER > 1000 Ah@e9`_r  
#pragma once [Y.JC'F#  
#endif // _MSC_VER > 1000 g$"x,:2x{  
'-n Iy$>  
class CCaptureDlg : public CDialog F !OD*]  
{ `^on`"\{u  
 // Construction eY?OUS  
 public: ZBx,'ph}4  
  BOOL bTray; F 2zUz[  
  BOOL bRegistered; X6$Cd]MN  
  BOOL RegisterHotkey(); HOH5_E>d  
  UCHAR cKey; ;=^J_2ls  
  UCHAR cMask; 83_mR*tGNp  
  void DeleteIcon(); \8\T TkVSq  
  void AddIcon(); VyYrL]OrA  
  UINT nCount; HGh)d` 8  
  void SaveBmp(); |E$q S)y  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor *sB'D+-/  
  // Dialog Data +lFBH(o]X  
  //{{AFX_DATA(CCaptureDlg) l*w'  O  
  enum { IDD = IDD_CAPTURE_DIALOG }; b%"/8rK  
  CComboBox m_Key; ` -SC,qHw  
  BOOL m_bControl; DoO ;VF  
  BOOL m_bAlt; ,|?#+O{  
  BOOL m_bShift; x5smJ__/  
  CString m_Path; lB/ ^  
  CString m_Number; ;*FY+jM  
  //}}AFX_DATA F g):>];<9  
  // ClassWizard generated virtual function overrides N.]~%)K:{  
  //{{AFX_VIRTUAL(CCaptureDlg) Yc~lYz+b  
 public: z(O*DwY#  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ^2%)Nq;O  
 protected: 9{S$%D  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }uaFmXy3  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); e?07o!7[;  
  //}}AFX_VIRTUAL .`J*l=u$  
  // Implementation %G6x\[,  
 protected: l& sEdEA  
  HICON m_hIcon; %z[=T@  
  // Generated message map functions -AVT+RE9z  
  //{{AFX_MSG(CCaptureDlg) )>Z@')Uk:  
  virtual BOOL OnInitDialog(); Mg8ciV}\xY  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~p{YuW[e  
  afx_msg void OnPaint(); $I#~<bW,  
  afx_msg HCURSOR OnQueryDragIcon(); Rc D5X{qS#  
  virtual void OnCancel(); fwzyCbks  
  afx_msg void OnAbout(); BonjK#  
  afx_msg void OnBrowse(); ngd4PN>{4  
  afx_msg void OnChange(); i Pl/I  
 //}}AFX_MSG zp'hA  
 DECLARE_MESSAGE_MAP() ?;5/"/i  
}; |d6/gSiF  
#endif ;O,&MR{;|n  
=)i^E9  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Y Kp@ n8A  
#include "stdafx.h" RhF< {U.  
#include "Capture.h" mKV31wvK}  
#include "CaptureDlg.h" pK_zq  
#include <windowsx.h> rij%l+%@#  
#pragma comment(lib,"hook.lib") ~mah.8G  
#ifdef _DEBUG 'aD"v>  
#define new DEBUG_NEW Wie0r@5E  
#undef THIS_FILE F8tMZ,:  
static char THIS_FILE[] = __FILE__; .ty2! .  
#endif gwg~4:W  
#define IDM_SHELL WM_USER+1 j1K~zG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /Hm/%os  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /J!hKK^k  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; &pz`gna  
class CAboutDlg : public CDialog e,#5I(E  
{ H D$`ZV  
 public: TI"Ki$jC  
  CAboutDlg(); {LqYb:/C5U  
  // Dialog Data tId,Q>zH  
  //{{AFX_DATA(CAboutDlg) _:Y| a>  
  enum { IDD = IDD_ABOUTBOX }; SnvT !ca  
  //}}AFX_DATA " ? V;C  
  // ClassWizard generated virtual function overrides 9T`YHA'g  
  //{{AFX_VIRTUAL(CAboutDlg) zI(uexxPqd  
 protected: &lzCRRnvt  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support tN.BI1nB  
  //}}AFX_VIRTUAL ]PL\;[b>  
  // Implementation U%VFr#  
 protected: ab)ckRC  
  //{{AFX_MSG(CAboutDlg) r,vSDHb`j  
  //}}AFX_MSG F60m]NUM)c  
  DECLARE_MESSAGE_MAP() KqaEHL  
}; }PDtx:T-  
AtAu$"ue  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) $}YN`:{  
{ ]:?hU^H]<  
 //{{AFX_DATA_INIT(CAboutDlg) hA&m G33  
 //}}AFX_DATA_INIT %){/O}I]>  
} tLdQO"  
NP~3!b  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) m<cv3dbZo  
{ Xfg?\j/  
 CDialog::DoDataExchange(pDX); O0pXHXSAL  
 //{{AFX_DATA_MAP(CAboutDlg) *8%uXkMm  
 //}}AFX_DATA_MAP 56NDU>j$  
} k4:=y9`R}$  
bsI?=lO  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) LT,zk)5  
 //{{AFX_MSG_MAP(CAboutDlg) { M[iYFg=  
 // No message handlers %t:13eM  
 //}}AFX_MSG_MAP += gU`<\  
END_MESSAGE_MAP() dOg c%(kz  
pm=s  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) _R ;$tG,  
: CDialog(CCaptureDlg::IDD, pParent) '=K~M  
{ ^fS_h `B  
 //{{AFX_DATA_INIT(CCaptureDlg) biQ~q $E  
  m_bControl = FALSE; n4+ ^f~Y  
  m_bAlt = FALSE; />PH{ l  
  m_bShift = FALSE; 8N#.@\'kz.  
  m_Path = _T("c:\\"); Q5Mn=  
  m_Number = _T("0 picture captured."); Di$++T8"  
  nCount=0; p8&rl|z|  
  bRegistered=FALSE; 1x+w|h  
  bTray=FALSE; O#vIn}  
 //}}AFX_DATA_INIT "88<{xL  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ah!RQ2hDrV  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 2&o3OKt  
} |hu9)0 P  
F22]4DLHO  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) +~lPf.  
{ "#%9dWy  
 CDialog::DoDataExchange(pDX); L N'})CI8m  
 //{{AFX_DATA_MAP(CCaptureDlg) WO+>W+|N  
  DDX_Control(pDX, IDC_KEY, m_Key); 3|/zlKZz  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 5* ~E dT  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 0{Zwg0&  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); = o1&.v2j  
  DDX_Text(pDX, IDC_PATH, m_Path); nC9x N  
  DDX_Text(pDX, IDC_NUMBER, m_Number); : +fW#:  
 //}}AFX_DATA_MAP u H)v\Js  
} Nb>C5TjR  
0qN?4h)7  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) a)/ }T  
//{{AFX_MSG_MAP(CCaptureDlg) >- CNHb  
 ON_WM_SYSCOMMAND() U owbk:  
 ON_WM_PAINT() GM@0$  
 ON_WM_QUERYDRAGICON() eI5W; Q4  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) )OQih+#?W  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) $*+UX   
 ON_BN_CLICKED(ID_CHANGE, OnChange) 6bbzgULl  
//}}AFX_MSG_MAP [Ue"#w  
END_MESSAGE_MAP() :&O6Y-/B  
@Y&(1Wl  
BOOL CCaptureDlg::OnInitDialog() &=-{adm  
{ G\r>3Ys  
 CDialog::OnInitDialog(); KKwJ=za  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); o{K#LP  
 ASSERT(IDM_ABOUTBOX < 0xF000); E-$N!KY  
 CMenu* pSysMenu = GetSystemMenu(FALSE); "Za'K+4  
 if (pSysMenu != NULL) 2wYY0=k2  
 { hOcVxSc.  
  CString strAboutMenu; glNXamo  
  strAboutMenu.LoadString(IDS_ABOUTBOX); gBy7 q09r  
  if (!strAboutMenu.IsEmpty()) - I j  
  { mS-{AK  
   pSysMenu->AppendMenu(MF_SEPARATOR); 1jj.oa]  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); +"[}gss!@  
  } (V8lmp-F  
 } SRyot:l   
 SetIcon(m_hIcon, TRUE); // Set big icon ]y/!GFQ  
 SetIcon(m_hIcon, FALSE); // Set small icon {UOR_Vt!*  
 m_Key.SetCurSel(0); =>)4>WT8A  
 RegisterHotkey(); /p[lOg  
 CMenu* pMenu=GetSystemMenu(FALSE); /2]=.bLwz  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); :x_;-  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 4VlQN$  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); PZCOJK  
 return TRUE; // return TRUE unless you set the focus to a control T_4y;mf!@O  
} )Yw m_f-N  
.RWKZB  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |z.Z='`  
{ OQby=}A  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) koOp:7r  
 { kQ $.g<  
  CAboutDlg dlgAbout; 1}I%yOi)  
  dlgAbout.DoModal(); ?\T):o;/  
 } ?h|w7/9  
 else 83gp'W{|  
 { 2S_7!|j  
  CDialog::OnSysCommand(nID, lParam); VaFv%%w  
 } K<D=QweOon  
} EN@Pr `R  
Kd^,NAg  
void CCaptureDlg::OnPaint() G\o *j |  
{ ZklZU,\!|v  
 if (IsIconic()) WB>M7MI%  
 { tCP;IU$  
  CPaintDC dc(this); // device context for painting 'wP\VCL2>  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); a*KJjl?k  
  // Center icon in client rectangle pksF| VS  
  int cxIcon = GetSystemMetrics(SM_CXICON); )\Ay4 d  
  int cyIcon = GetSystemMetrics(SM_CYICON); W{*w<a_ `  
  CRect rect; sRf?JyB  
  GetClientRect(&rect); OLgW .j:Ag  
  int x = (rect.Width() - cxIcon + 1) / 2; [n9X5qG~  
  int y = (rect.Height() - cyIcon + 1) / 2; Q.])En >i  
  // Draw the icon AU/L_hg  
  dc.DrawIcon(x, y, m_hIcon); F\hU V[  
 } b:>t1S Ul  
 else FaE,rzn)iD  
 { jMB&(r  
  CDialog::OnPaint(); !&8HA   
 } xO` O$ie  
} #MI4 `FZ  
IAa}F!6Q1  
HCURSOR CCaptureDlg::OnQueryDragIcon() !S}4b   
{ J+20]jI  
 return (HCURSOR) m_hIcon; o+.LG($+U  
} v6_fF5N/  
9)]asY  
void CCaptureDlg::OnCancel() ~xP4}gs1  
{ j5qrM_Chg  
 if(bTray) S2EeC&-AR  
  DeleteIcon(); ojQjx|Q}  
  CDialog::OnCancel(); }O7b&G:nW  
} *1cl PK  
mk&`dr  
void CCaptureDlg::OnAbout() L]|[AyNu  
{ kc&MO`2 W\  
 CAboutDlg dlg; xHY#"   
 dlg.DoModal(); d%='W|i\p&  
} ley: =(  
auV<=1<zJ  
void CCaptureDlg::OnBrowse() pSlosv(6  
{ g4 G?hv`R  
 CString str; C Nt  
 BROWSEINFO bi; @u}1 S1  
 char name[MAX_PATH]; Xeo2 < @[  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); aR}L- -m  
 bi.hwndOwner=GetSafeHwnd(); A ^wIsAxT  
 bi.pszDisplayName=name; c$[cDf~  
 bi.lpszTitle="Select folder"; & e~g}7  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Qt+;b  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); XrD@q  
 if(idl==NULL) c O[Hr  
  return; .gK>O2hI  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); S;]][h =  
 str.ReleaseBuffer(); /kKF|Hg`c  
 m_Path=str; yG<`7v  
 if(str.GetAt(str.GetLength()-1)!='\\') n_X)6 s  
  m_Path+="\\"; ?$&iVN^UA  
 UpdateData(FALSE); iO_6>&(  
} %Vp'^,&S  
|Q)c{9sD  
void CCaptureDlg::SaveBmp() l;C00ZBOc  
{ Xitsb f=Gg  
 CDC dc; M@b:~mI[sw  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); J$X{4  
 CBitmap bm; {"x8 q  
 int Width=GetSystemMetrics(SM_CXSCREEN); K~B@8az  
 int Height=GetSystemMetrics(SM_CYSCREEN); o> i`Jq&  
 bm.CreateCompatibleBitmap(&dc,Width,Height); W~e/3#R\=  
 CDC tdc; Z} Ld!Byz  
 tdc.CreateCompatibleDC(&dc); xmI!N0eta  
 CBitmap*pOld=tdc.SelectObject(&bm); O0VbKW0h3  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 3"ii_#1  
 tdc.SelectObject(pOld); ya^zlj\`0e  
 BITMAP btm; i`}nv,  
 bm.GetBitmap(&btm); c0%.GcF0{  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; W%bzA11l  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); p#eai  
 BITMAPINFOHEADER bih; B5iVT<:a  
 bih.biBitCount=btm.bmBitsPixel; ?i8a)!U  
 bih.biClrImportant=0; qfQg?Mr  
 bih.biClrUsed=0; 1:+f@#  
 bih.biCompression=0; `x0GT\O2-  
 bih.biHeight=btm.bmHeight; hH|moj]  
 bih.biPlanes=1; yRt>7'@X  
 bih.biSize=sizeof(BITMAPINFOHEADER); %3r`EIB6  
 bih.biSizeImage=size; nr t3wqJ  
 bih.biWidth=btm.bmWidth; );zLy?n  
 bih.biXPelsPerMeter=0; hkhk,bhI  
 bih.biYPelsPerMeter=0; z[q#Dw  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); O-D${==  
 static int filecount=0; YA vOV-L  
 CString name; mrgieb%  
 name.Format("pict%04d.bmp",filecount++); `Z 3p( G  
 name=m_Path+name; &2EimP  
 BITMAPFILEHEADER bfh; TZ2-%k#  
 bfh.bfReserved1=bfh.bfReserved2=0; ; n)9  
 bfh.bfType=((WORD)('M'<< 8)|'B'); d/fg  
 bfh.bfSize=54+size; Av#_cL  
 bfh.bfOffBits=54; u\9t+wi}<  
 CFile bf; `(rnD  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ CPto?=*A  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); fi6i{(K  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); O_u2V'jy9  
  bf.WriteHuge(lpData,size); 0A}'@N@G)  
  bf.Close(); hrRkam !y  
  nCount++; AP8YY8,  
 } X4"D Lt"  
 GlobalFreePtr(lpData); sr+Y"R  
 if(nCount==1) 4*K~6Vh  
  m_Number.Format("%d picture captured.",nCount); 5w# Ceg9  
 else 2tq~NA\#t  
  m_Number.Format("%d pictures captured.",nCount); Kn !n}GtR  
  UpdateData(FALSE); 8 )W{&#C>  
} ?%RN? O(  
E9]/sFA-]  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ZT \=:X*e  
{ "5+x6/9b  
 if(pMsg -> message == WM_KEYDOWN) Z?7XuELKV  
 { yJj$iri  
  if(pMsg -> wParam == VK_ESCAPE) Vlk]  
   return TRUE; e95x,|.-_  
  if(pMsg -> wParam == VK_RETURN) ># {,(8\  
   return TRUE; &ZmHR^Flz  
 } 91 ]"D;NN  
 return CDialog::PreTranslateMessage(pMsg); ;U02VguC  
} 1${lHVx]  
_.ny<r:g  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) xzqgem`[\  
{ U=<d;2N#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ X~`<ik{q  
  SaveBmp(); *Z+8L*k97  
  return FALSE; jI-\~  
} ]Ywj@-*q  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `H_.<``>  
 CMenu pop; P2q'P&  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); `pHlGbrW  
 CMenu*pMenu=pop.GetSubMenu(0); nMniHB'  
 pMenu->SetDefaultItem(ID_EXITICON); km)5?  
 CPoint pt; &rcC7v K9  
 GetCursorPos(&pt); /ynvQ1#uA  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); >8pmClVvmR  
 if(id==ID_EXITICON) "o=*f/M  
  DeleteIcon(); A1mxM5N  
 else if(id==ID_EXIT) )@X `B d  
  OnCancel(); X/5\L.g2  
 return FALSE; K,VN?t <h  
} ) N8 [@  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 5iG+O4n%  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Hq[vh7Lux  
 AddIcon(); $[p<}o/6v]  
 return res; !OVTs3}  
} )<.BN p  
M:!Twz$  
void CCaptureDlg::AddIcon() @ 435K'!  
{ 4! Cu>8B  
 NOTIFYICONDATA data; L=7 U#Q/DE  
 data.cbSize=sizeof(NOTIFYICONDATA); $qoh0$  
 CString tip; X"S-f; b#  
 tip.LoadString(IDS_ICONTIP); jK[~d Y  
 data.hIcon=GetIcon(0); % |6t\[gn  
 data.hWnd=GetSafeHwnd(); cWd\Ki  
 strcpy(data.szTip,tip); PWwz<AI+  
 data.uCallbackMessage=IDM_SHELL; 1YGj^7V)|Z  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; /``4!jU  
 data.uID=98; [>B`"nyNQ  
 Shell_NotifyIcon(NIM_ADD,&data); nK@RFU6  
 ShowWindow(SW_HIDE); / _N*6a~  
 bTray=TRUE; )9^0Qk' ]  
} bJ[{[|yEd  
/~,|zz  
void CCaptureDlg::DeleteIcon() J?yNZK$WqN  
{ [<HU ~PP  
 NOTIFYICONDATA data; \m>mE/N  
 data.cbSize=sizeof(NOTIFYICONDATA); QbF!V%+a's  
 data.hWnd=GetSafeHwnd(); SMMV$;O{9  
 data.uID=98; DNP %]{J  
 Shell_NotifyIcon(NIM_DELETE,&data); |C\%H R  
 ShowWindow(SW_SHOW); zyznFiE  
 SetForegroundWindow(); zL1*w@6  
 ShowWindow(SW_SHOWNORMAL); y+ZRh?2  
 bTray=FALSE; <Ae1YHUY  
} :'L^zGf  
MH"{N "|  
void CCaptureDlg::OnChange() Mw0Kg9M  
{ z,6X{=  
 RegisterHotkey(); x=UwyZ  
} ;*3OkNxa3  
?0v(_ v  
BOOL CCaptureDlg::RegisterHotkey() `)9nBZ  
{ 4K_fN  
 UpdateData(); tWs ]Zd  
 UCHAR mask=0; eV?._-G  
 UCHAR key=0; i2a""zac  
 if(m_bControl) D{Zjo)&tF'  
  mask|=4; .|[5*-  
 if(m_bAlt) e|`QW|9 .  
  mask|=2; &\3k(j  
 if(m_bShift) Dr;-2$Kt/&  
  mask|=1; U"1z"PcV  
  key=Key_Table[m_Key.GetCurSel()]; c$cb2V7,  
 if(bRegistered){ To x{Sk3L  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); SJYy,F],V"  
  bRegistered=FALSE; R]0p L   
 } `N+A8  
 cMask=mask; bNUb  
 cKey=key; mkA1Sh{hX>  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); RXMzwk  
 return bRegistered; u7rA8u|TO  
} eXHk6[%[  
+=XDNSw  
  四、小结 (J c} K  
ZT UaF4k j  
  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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