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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: Dg W*Br8<  
  d#NG]V/   
  一、实现方法 2M@,g8O+B=  
~qT5F)$B-  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: -Q9} gaH_  
d0YDNP%,_  
#pragma data_seg("shareddata") muc6gwBp  
HHOOK hHook =NULL; //钩子句柄 54r/s#|-3  
UINT nHookCount =0; //挂接的程序数目 q8#zv_>K  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 n3 y`='D  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Yv>kToa\^  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey OO#_ 0qK  
static int KeyCount =0; y\k#83aU|  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 opqY@>Vh&  
#pragma data_seg() ~Z-o2+xA  
"n'kv!?\  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 Ht pZ5  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: n<3qr}ZG^  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR wNl{,aH@  
cKey,UCHAR cMask) -c4g;;%  
{ mBN+c9n/  
 BOOL bAdded=FALSE; :J6 xYy$  
 for(int index=0;index<MAX_KEY;index++){ $ra q,SP  
  if(hCallWnd[index]==0){ %^Zu^uu   
   hCallWnd[index]=hWnd; $\Oc]%  
   HotKey[index]=cKey; #83`T&Xw*  
   HotKeyMask[index]=cMask; 7 x#QkImQ  
   bAdded=TRUE; []OmztB  
   KeyCount++; gxPu/VD4  
   break; e|> 5 R  
  } &Ql$7: r  
 } #|8Ia:=s  
 return bAdded; >UNx<=ry  
} z* k(` '  
//删除热键 h>k[  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) < #FxI  
{ Cg_9V4h.C  
 BOOL bRemoved=FALSE; u'`eCrKT*  
 for(int index=0;index<MAX_KEY;index++){ ;|U !\Xp  
  if(hCallWnd[index]==hWnd){ !:baG]Y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ q]Vxf!0*>  
    hCallWnd[index]=NULL; _TntZv.?  
    HotKey[index]=0; #;D@`.#\  
    HotKeyMask[index]=0; '2XIeR  
    bRemoved=TRUE; sD#*W<  
    KeyCount--; y~Z7sx0  
    break; ghU~H4[xD  
   } y7^E`LKK  
  } {f"oqry_g  
 } ~)CGwST[  
 return bRemoved; m941 Y  
} WF] |-)vw  
ghGpi U$  
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  DLL中的钩子函数如下: q{Ao j  
P"[\p|[U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) owviIZFe  
{ X{Ij30Bmv  
 BOOL bProcessed=FALSE; Dr K@y8  
 if(HC_ACTION==nCode) n{$! ]^>  
 { A3^_'K  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 L.2!Q3&  
   switch(wParam) 7?ICXhu9  
   {  *Za'^Z2  
    case VK_MENU: AcP d(Pc  
     MaskBits&=~ALTBIT; ?k`UQi]Q  
     break; 'D'H)J  
    case VK_CONTROL: "O~7s}  
     MaskBits&=~CTRLBIT; H7FOf[3'  
     break; 9CG&MvF c  
    case VK_SHIFT: O@HL%ha  
     MaskBits&=~SHIFTBIT; !mH !W5&  
     break; uN&UYJ' B  
    default: //judge the key and send message [nA1WFfM  
     break; R0~w F>  
   } !LM9  
   for(int index=0;index<MAX_KEY;index++){ FQBE1h@k0u  
    if(hCallWnd[index]==NULL) ~^bf1W[  
     continue; BdrYc^?JL]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (<2!^v0.M  
    { y!8m7a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); i^@hn>s$  
     bProcessed=TRUE; |@5G\N-  
    } `*WzHDv5p  
   } ^P|Zze zwU  
  } } _=h]|6t  
  else if((lParam&0xc000ffff)==1){ //有键按下 #(}'G*  
   switch(wParam)  oP~%7Jt  
   { 5[LDG/{Tys  
    case VK_MENU: BdB9M8fM  
     MaskBits|=ALTBIT; LNcoTdv}k  
     break; =%SH2kb  
    case VK_CONTROL: {4{X`$  
     MaskBits|=CTRLBIT; vM?,#:5  
     break; <ivq}(%72  
    case VK_SHIFT: _Un*x5u2O  
     MaskBits|=SHIFTBIT; ?f= ~Pn+  
     break; CC)Mws+2  
    default: //judge the key and send message VpX*l3  
     break; j^.|^q<Y  
   } :28[k~.bo  
   for(int index=0;index<MAX_KEY;index++){ f}EsS  
    if(hCallWnd[index]==NULL) RK/>5  
     continue; Vkf c&+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) OP|X-  
    { b ,x$wP+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); b#-=Dbe  
     bProcessed=TRUE; E|3[$?=R  
    } / hg)=p  
   } @HE<\Z{ KI  
  } .P#t"oW}  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 + B<7]\\M  
   for(int index=0;index<MAX_KEY;index++){ _ h/:r1  
    if(hCallWnd[index]==NULL) xb2j |KY7  
     continue; *B)10R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) O03F@v  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >9y!M'V  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 1HLU &  
   } H#M;TjR  
  } @1~cPt   
 } XVF!l>nE  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 1 F&}e&}c  
} H2'djZ  
$F1Am%  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ~7gFddi=i  
X4L@|"ZI  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); JkI|Ojmm/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hcpe~spz9|  
~x[(1  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: GL _hRu  
0v#p4@Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /IlO   
{ !D!"ftOm  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) mA#;6?6  
 { -Un"z6*  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 uqVarRi$  
  SaveBmp(); xt6%[)  
  return FALSE; 3L-$+j~u  
 } g'Wr+( A_  
 …… //其它处理及默认处理 c_t7<  
} MO? }$j  
_q4Yq'dI  
Fr-Vq =j&  
  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。 k(xB%>ns  
%XQJ!sC`  
  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。 {8 &=t8,c  
vXZ )  
  二、编程步骤 (Vn3g ra  
|tC=  j.  
  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"; QRx9;!~b}  
N;DE,[:<  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; "MD 6<H  
A@;{ #.O  
  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; mKoDy`s  
] f5vk  
  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; 3sgo5D-rMI  
/z(d!0_q|v  
  5、 添加代码,编译运行程序。 {P3gMv;  
%_G '#Bn<  
三、程序代码 mz<X$2]?  
Y-,S_59  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL :QF`Orb!^  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) KpIY>k  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ fm$Qd^E|e  
#if _MSC_VER > 1000 (w`_{%T  
#pragma once a5(9~. 9  
#endif // _MSC_VER > 1000 Z{gDEo)  
#ifndef __AFXWIN_H__ pU<GI@gU  
#error include 'stdafx.h' before including this file for PCH F$'po#  
#endif t~$8sG\  
#include "resource.h" // main symbols ^)o]hE|  
class CHookApp : public CWinApp @V&HE:P  
{ _Ea1;dJmq  
 public: IpM"k)HR  
  CHookApp(); )NTpb  
  // Overrides iVo-z#  
  // ClassWizard generated virtual function overrides eep/96G ?  
  //{{AFX_VIRTUAL(CHookApp) %TO&  
 public: VF+g+~  
  virtual BOOL InitInstance(); UGvUU<N|N  
  virtual int ExitInstance(); ,Xg^rV~]  
  //}}AFX_VIRTUAL Bc`L ]<  
  //{{AFX_MSG(CHookApp) a '?LC)^  
  // NOTE - the ClassWizard will add and remove member functions here. YDZB$?&a  
  // DO NOT EDIT what you see in these blocks of generated code ! c[;A$P= 8.  
  //}}AFX_MSG HG)$ W  
  DECLARE_MESSAGE_MAP() 'Hgk$Im+  
}; Zad>i w}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); S_^;#=_c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =iB$4d2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Pb1.X9*8c  
BOOL InitHotkey(); EztuVe  
BOOL UnInit(); GnC s_[*&r  
#endif *^XMf  
OB++5Wd  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. i>C%[dk9  
#include "stdafx.h"  z@~mu  
#include "hook.h" 99%R/m  
#include <windowsx.h> 2IP<6l8N  
#ifdef _DEBUG =$T[  
#define new DEBUG_NEW TH55@1W,[  
#undef THIS_FILE ?m9=Me  
static char THIS_FILE[] = __FILE__; ,|]k4F  
#endif xZ* B}O{{H  
#define MAX_KEY 100 b2RW=m-  
#define CTRLBIT 0x04 >"z`))9  
#define ALTBIT 0x02 FE:} D ;$  
#define SHIFTBIT 0x01 s#aane  
#pragma data_seg("shareddata") xgtx5tg  
HHOOK hHook =NULL; wod(P73?  
UINT nHookCount =0; i[wnG)  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey AG#Mj(az!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 1;!dTh  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 4QYStDFe  
static int KeyCount =0; vbtjPse  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 7mn&w$MS4:  
#pragma data_seg() sQ&<cBs2  
HINSTANCE hins; )`2ncb   
void VerifyWindow(); - ^Y\'y2  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) `Gx 5=Bm;  
//{{AFX_MSG_MAP(CHookApp) |oQhtk8.  
// NOTE - the ClassWizard will add and remove mapping macros here. }*!_M3O  
// DO NOT EDIT what you see in these blocks of generated code! JdUI:(  
//}}AFX_MSG_MAP R*lq.7   
END_MESSAGE_MAP() K M[&WT  
G @]n(\7Y  
CHookApp::CHookApp() 'R#MH  
{ oW>e.}d!  
 // TODO: add construction code here, dnM.  
 // Place all significant initialization in InitInstance ZTj!ti;5  
} Ef3=" }AI;  
hM&VMa[  
CHookApp theApp; ? :A%$T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 1uEM;O  
{ QtcYFf g  
 BOOL bProcessed=FALSE; s!]QG  
 if(HC_ACTION==nCode) %`s1 Ocvp  
 { $O fZp<M  
  if((lParam&0xc0000000)==0xc0000000){// Key up iQgr8[ SFf  
   switch(wParam) + (`.pa z@  
   { %WqUZ+yy  
    case VK_MENU: vrh2}biCR  
     MaskBits&=~ALTBIT; U.=TjCW  
     break; J<9}) m  
    case VK_CONTROL: #%/Jr 52<  
     MaskBits&=~CTRLBIT; mi@uX@ #  
     break; iszVM  
    case VK_SHIFT: S2 P9C"  
     MaskBits&=~SHIFTBIT; LaL{ ^wP  
     break; bn=7$Ax  
    default: //judge the key and send message f:AfMf>m  
     break; X|4Kdi.r@  
   } B->oTC`5  
   for(int index=0;index<MAX_KEY;index++){ J/rF4=j%xy  
    if(hCallWnd[index]==NULL) <"S`ZOn  
     continue; 67||wh.BU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DD6K[\  
    { YllW2g:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); !G<gp4Js+N  
     bProcessed=TRUE; @lqI,Ce5  
    } #U vWS  
   } cK IA.c}N  
  } 2ppJ;P{k  
  else if((lParam&0xc000ffff)==1){ //Key down *8/cd0  
   switch(wParam) <2LUq@Pg  
   { > lI2r}  
    case VK_MENU: /8,cF7XL*  
     MaskBits|=ALTBIT; ^a|  
     break; 0&3zBL%Bo  
    case VK_CONTROL: -AQ 7Bd  
     MaskBits|=CTRLBIT; M(ie1Ju  
     break; d7Z$/ $  
    case VK_SHIFT: I]Z"?T  
     MaskBits|=SHIFTBIT; ' R= OeH  
     break; M{=p0?X  
    default: //judge the key and send message _+Uf5,.5yU  
     break; {>Qs+]  
   } Bi0&F1ZC!  
   for(int index=0;index<MAX_KEY;index++) v5FfxDvw  
   { mAe)Hy %  
    if(hCallWnd[index]==NULL) \=(U tro  
     continue; bE jQMlb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m$g{&  
    { =7S\-{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;9)=~)  
     bProcessed=TRUE; _z#S8Y  
    } mhNgXp)_56  
   } >^v,,R8j  
  } R78P](1\>  
  if(!bProcessed){ ~`0=-Qkd  
   for(int index=0;index<MAX_KEY;index++){ d:h X3  
    if(hCallWnd[index]==NULL) JaN53,&<  
     continue; 7+$P6[*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) r90R~'5x9  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); +1eb@b X  
   } wFJ*2W:  
  } xoQqku"vn  
 } iH-(_$f;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4EhWK;ra  
} I=k`VId:  
vfh\X1Ui}  
BOOL InitHotkey() '=UsN_@  
{ )<T2J0*  
 if(hHook!=NULL){ ^>s{o5H&  
  nHookCount++; hgdr\ F  
  return TRUE; \'B%lXh  
 } |e2s{J2   
 else i>=y3x"  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); C1-Jj_XQ.  
  if(hHook!=NULL) '~xjaa;.  
   nHookCount++; u}jC$T>2%6  
  return (hHook!=NULL); 7[M@;$  
} z~jk_|?|?  
BOOL UnInit() &qm:36Y7Xg  
{ D)eRk0iC  
 if(nHookCount>1){ 6h&i<->  
  nHookCount--; ~tB9kLFG  
  return TRUE; %kk~qvW  
 } TEbE-h0)]  
 BOOL unhooked = UnhookWindowsHookEx(hHook); hNF,sA  
 if(unhooked==TRUE){ sv#/78~|  
  nHookCount=0; ? Lr:>  
  hHook=NULL; l YjPrA]TC  
 } {HP.HK  
 return unhooked; G+ NTn\  
} fBP J8VY  
3e|,Z'4}4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {InW%qSn_  
{ {<2q  
 BOOL bAdded=FALSE; l, -q:8  
 for(int index=0;index<MAX_KEY;index++){ w)}@svv"  
  if(hCallWnd[index]==0){ V&d?4i4/Q  
   hCallWnd[index]=hWnd; =CL h<&  
   HotKey[index]=cKey; #3-hE  
   HotKeyMask[index]=cMask; C+-sf  
   bAdded=TRUE; q94*2@KV  
   KeyCount++; n:JG+1I  
   break; K$-|7tJon  
  } 22D,,nC0+=  
 } .U,>Qn4/  
 return bAdded; ?xo<Fv  
} 3\5I4#S  
}ct*<zj[~u  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) XKbTj R  
{ dg;E,'e_ p  
 BOOL bRemoved=FALSE; w6[$vib'  
 for(int index=0;index<MAX_KEY;index++){ o q cu<]  
  if(hCallWnd[index]==hWnd){ mz^[C7(q'(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Q0TKM >  
    hCallWnd[index]=NULL; 6`)Ss5jzk  
    HotKey[index]=0; u6P U(f  
    HotKeyMask[index]=0; #s-li b  
    bRemoved=TRUE; ''CowI  
    KeyCount--; QtfLJ5vi  
    break; Y= ^o {C6  
   } = 8\'AU  
  } d6"B_,*b  
 } \V9);KAOj  
 return bRemoved; -257g;  
} 3$kElq[  
ZHc;8|}  
void VerifyWindow() 7`K)7  
{ $ dHD  
 for(int i=0;i<MAX_KEY;i++){ ~Nl`Zmn(A|  
  if(hCallWnd!=NULL){ +,bgOq\aG  
   if(!IsWindow(hCallWnd)){ IV$2`)[A&X  
    hCallWnd=NULL; H3q L&xL  
    HotKey=0; m{0u+obi&w  
    HotKeyMask=0; Mer\W6e"e  
    KeyCount--; JLV?n,nF  
   } 4(\7Or(''  
  } OTwXc*2u]  
 } +@K8:}lOW  
} n0ls a@l  
&E8fd/s= k  
BOOL CHookApp::InitInstance() m{sch`bP  
{ 7)a u#K6  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^b(> Bg )T  
 hins=AfxGetInstanceHandle(); iMOf];O)  
 InitHotkey(); Q@#Gm9m  
 return CWinApp::InitInstance(); %q,^A+=  
} (Zu V5|N  
JZrUl^8E  
int CHookApp::ExitInstance() 7S9Q{  
{ 9 TW  
 VerifyWindow(); .[#bOp*  
 UnInit(); 9 !qVYU42(  
 return CWinApp::ExitInstance(); BXo9s~5Q  
} Z'z~40Bda  
&:)e   
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file q CB9z  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) EM.rO/qcW  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .:#6dG\0z  
#if _MSC_VER > 1000 W'9=st'  
#pragma once Vl+,OBy  
#endif // _MSC_VER > 1000 A?8 29<  
v;@-bED(Qs  
class CCaptureDlg : public CDialog @3b|jJyf  
{ E={W^k!Vz:  
 // Construction i<Be)Y-'  
 public: }ZWeb#\  
  BOOL bTray; ;i><03  
  BOOL bRegistered; =F}e>D  
  BOOL RegisterHotkey(); +(<}`!9M*  
  UCHAR cKey; n`hes_{,g  
  UCHAR cMask; 8;s$?*G i  
  void DeleteIcon(); I"=XM   
  void AddIcon(); QYL ';  
  UINT nCount; &j7l#Urq  
  void SaveBmp(); 4q<:% 0M|  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor $'Hg}|53  
  // Dialog Data V-w[\u  
  //{{AFX_DATA(CCaptureDlg) PF(P"f.?D  
  enum { IDD = IDD_CAPTURE_DIALOG }; 4&/-xg87(  
  CComboBox m_Key; ^$y_~z3o#7  
  BOOL m_bControl; ?%HtPm2< %  
  BOOL m_bAlt; ngJES` 0d  
  BOOL m_bShift; o;JBe"1  
  CString m_Path; _dEf@==  
  CString m_Number; f:TC;K  
  //}}AFX_DATA T8FKa4ikn  
  // ClassWizard generated virtual function overrides pz^"~0o5  
  //{{AFX_VIRTUAL(CCaptureDlg) N3H!ptn37  
 public: vwzTrWA=  
  virtual BOOL PreTranslateMessage(MSG* pMsg); !`='K +  
 protected: +-#| M|a  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }h>e=<  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); w|PZSOJ  
  //}}AFX_VIRTUAL qD#-q vn  
  // Implementation qhpq\[U6in  
 protected: ? xX`_l  
  HICON m_hIcon; ^dYLB.'=  
  // Generated message map functions MnsnW{VGX  
  //{{AFX_MSG(CCaptureDlg) TR@$$RrU  
  virtual BOOL OnInitDialog(); "O|fX\}5  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); $(}kau  
  afx_msg void OnPaint(); DD'<zL[  
  afx_msg HCURSOR OnQueryDragIcon(); W.n@  
  virtual void OnCancel(); R< xxwjt  
  afx_msg void OnAbout(); ^LT9t2  
  afx_msg void OnBrowse(); +.HQ+`8z]  
  afx_msg void OnChange(); m= fmf(  
 //}}AFX_MSG sa+:c{  
 DECLARE_MESSAGE_MAP() rsP-?oD8)  
}; 2#1FI0,Pa*  
#endif $X~=M_ W  
=W !m`  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file lLtC9:  
#include "stdafx.h" ^O\tN\g;c  
#include "Capture.h" aM.l+D P  
#include "CaptureDlg.h" foE2rV/Y  
#include <windowsx.h> 4 '9h^C&  
#pragma comment(lib,"hook.lib") sS(^7GARa  
#ifdef _DEBUG =GM!M@~,Ab  
#define new DEBUG_NEW HA"dw2 |  
#undef THIS_FILE xYt{=  
static char THIS_FILE[] = __FILE__; NM ~e  
#endif *vsOL 4I%  
#define IDM_SHELL WM_USER+1 B?Y%y@.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); p|Rxy"}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7X}_yMxc  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Punbw\9!d,  
class CAboutDlg : public CDialog 2 >xV&  
{ Gh|1%g"gm  
 public: S^D ~A8u  
  CAboutDlg(); _W#27I  
  // Dialog Data 05pCgI}F>  
  //{{AFX_DATA(CAboutDlg) Z@C D1+G  
  enum { IDD = IDD_ABOUTBOX }; s9`T%pg  
  //}}AFX_DATA 9R;s;2$.  
  // ClassWizard generated virtual function overrides `(B1 "qRi  
  //{{AFX_VIRTUAL(CAboutDlg) a/)TJv  
 protected: u{p\8v%7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Bdbw!zRR$  
  //}}AFX_VIRTUAL <6L$ :vT_  
  // Implementation N{p2@_fnB  
 protected: <O\z`aA'q  
  //{{AFX_MSG(CAboutDlg) FT (EH  
  //}}AFX_MSG [V jd )%  
  DECLARE_MESSAGE_MAP() vlj|[joXw  
}; 4?yc/F=kI  
;-]f4O8  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) )s=z i"  
{ tfv]AC7x  
 //{{AFX_DATA_INIT(CAboutDlg) Tu/JhP/g,`  
 //}}AFX_DATA_INIT l3iL.?&Pa  
} 053W2Si   
l1W5pmhK]'  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) m_Fw ;s/9  
{ dEe/\i'r9  
 CDialog::DoDataExchange(pDX); QdW%5lM+  
 //{{AFX_DATA_MAP(CAboutDlg) bNaJ{Dm$R  
 //}}AFX_DATA_MAP 4a2&kIn  
} >9u6@  
5E!|-xD  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^jmnE.8R  
 //{{AFX_MSG_MAP(CAboutDlg) / V {w<  
 // No message handlers 0U/:Tpyr  
 //}}AFX_MSG_MAP Fsq S)  
END_MESSAGE_MAP() IG9Q~7@  
[?IERE!xQ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) dNJK[1e6  
: CDialog(CCaptureDlg::IDD, pParent) caj)  
{ nW drVT$  
 //{{AFX_DATA_INIT(CCaptureDlg) \GvVs  
  m_bControl = FALSE; BgpJ;D+N4  
  m_bAlt = FALSE; g:o\r (  
  m_bShift = FALSE; nev*TYY?A  
  m_Path = _T("c:\\"); !w)Mm P Xb  
  m_Number = _T("0 picture captured."); @$nI\ n?*  
  nCount=0; Rthu8NKn  
  bRegistered=FALSE; v"F0$c  
  bTray=FALSE; {YGz=5^  
 //}}AFX_DATA_INIT lP9I\Ge&  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 VhW;=y>}  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /d{L]*v)]  
} +qz)KtJS  
/p%K[)T(  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ~hxB Pn."  
{ q]r!5&Z  
 CDialog::DoDataExchange(pDX); QKP9*dz  
 //{{AFX_DATA_MAP(CCaptureDlg) k=~?!+p7  
  DDX_Control(pDX, IDC_KEY, m_Key); =V,'f  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); @`_j't,  
  DDX_Check(pDX, IDC_ALT, m_bAlt); N0qC/da1  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); H|TzD "2N  
  DDX_Text(pDX, IDC_PATH, m_Path); 6=@n b3D%  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Uv+pdRXn  
 //}}AFX_DATA_MAP I Mv^ 9T:  
} Qs?+vk?*h  
s?6 7@\  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) d#b{4zF"  
//{{AFX_MSG_MAP(CCaptureDlg)  q?^0 o\  
 ON_WM_SYSCOMMAND() q!H 3JL  
 ON_WM_PAINT() AQiP2`?  
 ON_WM_QUERYDRAGICON() - 5k4vx N}  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) OUdeQO?  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Ch.T} %  
 ON_BN_CLICKED(ID_CHANGE, OnChange) =)zq %d?i;  
//}}AFX_MSG_MAP _+Q$h4t   
END_MESSAGE_MAP() Asn0&Ys4  
Gqia@>T4*N  
BOOL CCaptureDlg::OnInitDialog() cUm9s>^)/  
{ 7GIv3Dc  
 CDialog::OnInitDialog(); v:HgpZo+  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); |v1 K@  
 ASSERT(IDM_ABOUTBOX < 0xF000); fN4p G*D  
 CMenu* pSysMenu = GetSystemMenu(FALSE); e N-{  
 if (pSysMenu != NULL) vXnpx}B  
 { LNN:GD)>  
  CString strAboutMenu; )R +o8C  
  strAboutMenu.LoadString(IDS_ABOUTBOX); M|v.5l#   
  if (!strAboutMenu.IsEmpty()) ipzUF o<w  
  { u:S@'z>  
   pSysMenu->AppendMenu(MF_SEPARATOR); XOeh![eMX  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); hv"toszj\  
  } \Zh)oUHd  
 } __V]HcP;  
 SetIcon(m_hIcon, TRUE); // Set big icon ^ 2AF:(E  
 SetIcon(m_hIcon, FALSE); // Set small icon D}061~zb$  
 m_Key.SetCurSel(0); eFnsf}(Iy  
 RegisterHotkey(); k,@J&   
 CMenu* pMenu=GetSystemMenu(FALSE); ={b ]  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,|#>X>^FQQ  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); =k*0O_  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); &S3W/lQs  
 return TRUE; // return TRUE unless you set the focus to a control |O)deiJRy  
} %'t~e?d!  
uv-W/p  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) :HE]P)wz-  
{ `;_tt_  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) f~q&.,I(  
 { cV{ZD q  
  CAboutDlg dlgAbout; `HM3YC  
  dlgAbout.DoModal(); pNqf2CnnT  
 }  ft'iv  
 else VA%"IAl  
 { Fkz  
  CDialog::OnSysCommand(nID, lParam); B@;)$1-UT  
 } YEQW:r_h.S  
} YDNqWP7s  
osd^SnL1/5  
void CCaptureDlg::OnPaint() I1myuZ  
{ gZjOlp  
 if (IsIconic()) ob] lCX)  
 { ii;WmE&  
  CPaintDC dc(this); // device context for painting |tg?b&QR  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); |x6mkSf]ke  
  // Center icon in client rectangle 8Wj=|Ow-q  
  int cxIcon = GetSystemMetrics(SM_CXICON); fMQ*2zGu95  
  int cyIcon = GetSystemMetrics(SM_CYICON); UC1!J =f  
  CRect rect; Ke ?uE  
  GetClientRect(&rect); VRX" @uCD  
  int x = (rect.Width() - cxIcon + 1) / 2; bS<@Rd{g  
  int y = (rect.Height() - cyIcon + 1) / 2; Jrk^J6aa  
  // Draw the icon qp W#!Vbx  
  dc.DrawIcon(x, y, m_hIcon); 2Z O'X9  
 } j>o +}p?3I  
 else bJ|?5  
 { <]'"e]  
  CDialog::OnPaint(); @ g75T`N  
 } @1F'V'  
} 0H3T'J%r  
Q@2tT&eL  
HCURSOR CCaptureDlg::OnQueryDragIcon() _=L;`~=C9e  
{ \u]CD}/  
 return (HCURSOR) m_hIcon; lkfFAwnc  
} kppRQ Q*[  
mbBRuPEa=u  
void CCaptureDlg::OnCancel() R1.sq(z`  
{ Uxemlp%%*  
 if(bTray) 5b#6 Y  
  DeleteIcon(); * |HZ&}  
  CDialog::OnCancel();  j/9QV  
} KupMndK  
p{a]pG+3  
void CCaptureDlg::OnAbout() Ys$YI{  
{ v1C.\fL  
 CAboutDlg dlg; C|f7L>qe  
 dlg.DoModal(); \5P.C  
} qu ~|d}0  
Fd[h9 G  
void CCaptureDlg::OnBrowse() %?f:"  
{ nuQ6X5>.=  
 CString str; $G_Q`w=jM  
 BROWSEINFO bi; ,Us2UEWNv  
 char name[MAX_PATH]; g`OOVaB  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); -(w~LT$ "  
 bi.hwndOwner=GetSafeHwnd(); zw: C*sY  
 bi.pszDisplayName=name; z"K( bw6  
 bi.lpszTitle="Select folder"; b%;59^4AjD  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; JYd7@Msfc  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); b;L>%;  
 if(idl==NULL) v1r_Z($  
  return; )_v\{N  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); )@qup _M@  
 str.ReleaseBuffer(); *e<Eu>fW#&  
 m_Path=str; 9>Uq$B  
 if(str.GetAt(str.GetLength()-1)!='\\') Ao":9r[V  
  m_Path+="\\"; Blbq3y+Sq  
 UpdateData(FALSE); ]1?=jlUl  
} `<J#l;y  
14D 7U/zer  
void CCaptureDlg::SaveBmp() irsfJUr[V  
{ _;:rkC fj  
 CDC dc; +%wWSZ<#  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); lKEX"KQ!  
 CBitmap bm;  Wu!t C  
 int Width=GetSystemMetrics(SM_CXSCREEN); s^>lOQ=  
 int Height=GetSystemMetrics(SM_CYSCREEN); MdH97L)L.0  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ]iDJ*!I  
 CDC tdc; h/Hl?O8[  
 tdc.CreateCompatibleDC(&dc); D;zWksq  
 CBitmap*pOld=tdc.SelectObject(&bm); XocsSs  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Znta#G0  
 tdc.SelectObject(pOld); ^IGyuj0]jG  
 BITMAP btm; OB6J.dF[%  
 bm.GetBitmap(&btm); d9Z&qdxTKq  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ZCQ< %f  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 90s;/y(  
 BITMAPINFOHEADER bih; "#twY|wW  
 bih.biBitCount=btm.bmBitsPixel; Cqgk  
 bih.biClrImportant=0; |rFR8srPG  
 bih.biClrUsed=0; -2\ZzK0tM  
 bih.biCompression=0; /zG +]  
 bih.biHeight=btm.bmHeight; gcg>Gjp  
 bih.biPlanes=1; ^Cg^ `n?@b  
 bih.biSize=sizeof(BITMAPINFOHEADER); e3eVvl5]  
 bih.biSizeImage=size; 2vc\=  
 bih.biWidth=btm.bmWidth; vUYJf99B  
 bih.biXPelsPerMeter=0; !7*(!as  
 bih.biYPelsPerMeter=0; efjO8J[uk-  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); .Z=Ce!  
 static int filecount=0; I1)-,/nEjg  
 CString name; )'5<6Q.]  
 name.Format("pict%04d.bmp",filecount++); UP;Q=t  
 name=m_Path+name; ivzAlwP  
 BITMAPFILEHEADER bfh; hOPe^e"  
 bfh.bfReserved1=bfh.bfReserved2=0; d(fPECv(  
 bfh.bfType=((WORD)('M'<< 8)|'B'); > BNw  
 bfh.bfSize=54+size; b]*X<,p  
 bfh.bfOffBits=54; cJ(BiL-uF  
 CFile bf; M XZq  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ f xDj+Q1p  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )nwZ/&@  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); qL| 5-(P  
  bf.WriteHuge(lpData,size); B6bOEPQ  
  bf.Close(); EZ"bW  
  nCount++; %bP~wl~  
 } MZ|\S/  
 GlobalFreePtr(lpData); Yb[n{.%/g  
 if(nCount==1) d/{Q t  
  m_Number.Format("%d picture captured.",nCount); \=!H2M  
 else 5`{vE4A]q  
  m_Number.Format("%d pictures captured.",nCount); )O3jQ_q=  
  UpdateData(FALSE); QjA&IZEC  
} b~_B [cf  
4:vTxNs&S  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) z)lM2x>|*  
{ ] @X{dc  
 if(pMsg -> message == WM_KEYDOWN) 47IY|Jdz  
 { r6`\d k  
  if(pMsg -> wParam == VK_ESCAPE) o+<29o  
   return TRUE; upypxC  
  if(pMsg -> wParam == VK_RETURN) l'U1 01M>F  
   return TRUE; 9ilM@SR  
 } }[ ].\G\G  
 return CDialog::PreTranslateMessage(pMsg); !?nu?  
} g96T*T  
v&fGCD\R  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) pOm@b `S%  
{ 2;G98H  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ P,i"&9 8  
  SaveBmp(); G0}Dq M Ti  
  return FALSE; McjS)4j&.  
} ,"Tjpdf  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ y%4 Gp  
 CMenu pop; P5xI  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); =3*Jj`AV  
 CMenu*pMenu=pop.GetSubMenu(0); k6@b|  
 pMenu->SetDefaultItem(ID_EXITICON); @\)fzubu  
 CPoint pt; =7 VCtd/  
 GetCursorPos(&pt); :NuR>~  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); rvic%bsk  
 if(id==ID_EXITICON) /D[dO6.  
  DeleteIcon(); 2F1ZAl  
 else if(id==ID_EXIT) *g1L$FBG  
  OnCancel(); dK.R[ aQ  
 return FALSE; 6xarYh(  
} ASW4,%cl  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ivfXat-  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) #{x5L^v>]  
 AddIcon(); @l~7 x  
 return res; %M9;I  
} zPVd(V~(T  
>AG^fUArH  
void CCaptureDlg::AddIcon() " 9@,l!  
{ 1Bg_FPu  
 NOTIFYICONDATA data; y"vX~LR  
 data.cbSize=sizeof(NOTIFYICONDATA); P-'_}*wxi  
 CString tip; "cMNdR1^,y  
 tip.LoadString(IDS_ICONTIP); /7gi/uh~-(  
 data.hIcon=GetIcon(0); ?Ko|dmX  
 data.hWnd=GetSafeHwnd(); gg[ 9u-  
 strcpy(data.szTip,tip); |3;(~a)%  
 data.uCallbackMessage=IDM_SHELL; p<KIF>rf|  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; =_ y\Y@J  
 data.uID=98; %cX"#+e  
 Shell_NotifyIcon(NIM_ADD,&data); >,"sHm}l%  
 ShowWindow(SW_HIDE); ,=|4:F9  
 bTray=TRUE; Vl<9=f7[  
} ne4c %?>t  
CWi8Fv  
void CCaptureDlg::DeleteIcon() 0(gq; H5x'  
{ W"Q!|#;l.  
 NOTIFYICONDATA data; E-fr}R}  
 data.cbSize=sizeof(NOTIFYICONDATA); QHzgy?  
 data.hWnd=GetSafeHwnd(); z(me@P!D~  
 data.uID=98; DyfsTx  
 Shell_NotifyIcon(NIM_DELETE,&data); Mra35  
 ShowWindow(SW_SHOW); F;u_7OM  
 SetForegroundWindow(); O*G1 QX  
 ShowWindow(SW_SHOWNORMAL); l~J*' m2  
 bTray=FALSE; IU#x[P!  
} 5ZK&fKeCF  
/p)F>WR  
void CCaptureDlg::OnChange() Zu21L3  
{ s+,&|;Q  
 RegisterHotkey(); m'x;,xfY&F  
} ^ve14mbF#.  
%d;<2b0  
BOOL CCaptureDlg::RegisterHotkey() tnb$sulc+  
{ .9h)bf+  
 UpdateData(); *Qkc[XHqy  
 UCHAR mask=0; =e BmBn  
 UCHAR key=0; z/7$NxJH  
 if(m_bControl) gnLn7?  
  mask|=4; >A}0Ho  
 if(m_bAlt) LA4<#KP  
  mask|=2; .Evy_o\^  
 if(m_bShift) 8IGt4UF&?  
  mask|=1; _1|$P|$P.  
  key=Key_Table[m_Key.GetCurSel()]; *1^$.Q&  
 if(bRegistered){ -M4p\6)Ge  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); >72JV; W]  
  bRegistered=FALSE; 30Drrno7Io  
 } dE5D3ze  
 cMask=mask; >xg5z  
 cKey=key; pQWHG#?7  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); #NNewzC<*  
 return bRegistered; NfzF.{nh  
} =o^|bih  
v`DI<Lt  
  四、小结 sx 9uV  
A:# k  
  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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