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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: fkE4 [X7f  
  z-fP #.  
  一、实现方法 NIufL }6\  
%,f|H :+>u  
  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: lx*"Pj9hho  
?dMyhU}  
#pragma data_seg("shareddata") +c4]}9f!  
HHOOK hHook =NULL; //钩子句柄 \Z9+U:n  
UINT nHookCount =0; //挂接的程序数目 FEj{/  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 2RXU75VY  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ucP}( $  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey +U/+iI>0  
static int KeyCount =0; 1A\Jh3;Q  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 g a|RW0  
#pragma data_seg() u&Q2/Y  
L,#ij!txS  
  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。 =9$hZ c  
*,q W9z  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 55xa Z#|  
:*|%g  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR l M ]n  
cKey,UCHAR cMask) /V@~Vlww  
{ XnC`JO+7M  
 BOOL bAdded=FALSE; E>|[@Z  
 for(int index=0;index<MAX_KEY;index++){ t\44 Pu%  
  if(hCallWnd[index]==0){ ! bbVa/  
   hCallWnd[index]=hWnd; 6 ,jp-`  
   HotKey[index]=cKey; h+EG) <  
   HotKeyMask[index]=cMask; .ko8`J%%M  
   bAdded=TRUE; {2wfv2hQ  
   KeyCount++; EfA*w/y  
   break; v+XB$j^H  
  } qOaI4JP@  
 } ;Zfglid  
 return bAdded; !DsKa6Zj  
} V,t&jgG*  
//删除热键 ^8dd  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) SF$'$6x}  
{ 2<&lrsh  
 BOOL bRemoved=FALSE; pw;  
 for(int index=0;index<MAX_KEY;index++){ Fy1@B(V%  
  if(hCallWnd[index]==hWnd){ i}SJ   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ul[edp_  
    hCallWnd[index]=NULL; ap|7./yg  
    HotKey[index]=0; AITV+=sN  
    HotKeyMask[index]=0; p.{9OrH(4  
    bRemoved=TRUE; ^rF{%1DT  
    KeyCount--; c_$9z>$  
    break; E`vCYhf{  
   } i=b<Mz7|  
  } (`S32,=TS  
 } 2c?-_OCy;  
 return bRemoved; &)F8i# M  
} Gao8!OaQ  
a/ d'(]  
 P%#WeQ+  
  DLL中的钩子函数如下: PF$K> d  
+ 3+^J?N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) r\6 "mU  
{ }bj dK  
 BOOL bProcessed=FALSE; ^kg[n908Nw  
 if(HC_ACTION==nCode) V}?d ,.m`{  
 { a.P7O!2Lp  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 3SbtN3  
   switch(wParam) *}BaO*A  
   {  =HJ)!(  
    case VK_MENU: ,E&PIbDL1  
     MaskBits&=~ALTBIT; p3?!}VM!y  
     break; l=(4o4um  
    case VK_CONTROL: _Wcr'*7  
     MaskBits&=~CTRLBIT; ]Z/<H P$#  
     break; W zM9{c  
    case VK_SHIFT: sW/^82(dM  
     MaskBits&=~SHIFTBIT; 4;G:.k!K  
     break; wNsAVUjLe  
    default: //judge the key and send message @^g/`{j>J  
     break; i <KWFF#  
   } *=]hc@  
   for(int index=0;index<MAX_KEY;index++){ EdQ:8h  
    if(hCallWnd[index]==NULL) v7rEU S-  
     continue; =-#>NlB$w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dP8b\H  
    { *E"QFirk0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); L_fu<W  
     bProcessed=TRUE; XA8{N  
    } aAHx^X^  
   } >Mml+4<5  
  } H{*~d+:ol  
  else if((lParam&0xc000ffff)==1){ //有键按下 xO8-vmf2  
   switch(wParam) {J`Zl1_q  
   { qTM,'7Rwn  
    case VK_MENU: p|mt2oDjw  
     MaskBits|=ALTBIT; bzFwQi}>  
     break; :r0?[#r?N,  
    case VK_CONTROL: 2z/qbzG7  
     MaskBits|=CTRLBIT; U=_O*n?N-d  
     break; A%H"a+  
    case VK_SHIFT: HX1RA 5O  
     MaskBits|=SHIFTBIT; 7P}&<;5zD  
     break; \!HG kmd  
    default: //judge the key and send message KiXXlaOs  
     break; r)$(>/[$  
   } .ztO._J7f  
   for(int index=0;index<MAX_KEY;index++){ mjdZ^  
    if(hCallWnd[index]==NULL) '1?b?nVo  
     continue; YVy+1q[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zyNg?_SM  
    { lp`raN No  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); <"I#lib  
     bProcessed=TRUE; eil"1$k  
    } -)%l{@Mr  
   } Gv,_;?7lD  
  } =,B44:`r  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ~m~<xtoc  
   for(int index=0;index<MAX_KEY;index++){ ha6jbni  
    if(hCallWnd[index]==NULL) %";bgU2Q  
     continue; 0 rbMT`Hy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) <ptZY.8N  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {"< D$*K~  
     //lParam的意义可看MSDN中WM_KEYDOWN部分  uY]nqb  
   } D$|@: mW  
  } BM+v,hGY  
 } T%kr&XsQX  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2y6 e]D  
} @ToY,@]e  
}^).Y7{g[  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 5 rpX"(  
'0z-duu  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qKX3Npw  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Zo}O,;(F5  
4L(/Z}(  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: #.|ef dsG  
09jU 0x  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <d".v  
{ wO6 D\#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) tOx)t$ix  
 { "8{#R*p  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 %3B0s?,I  
  SaveBmp(); Ke0j8|  
  return FALSE; JQCQpn/  
 } *3;H6   
 …… //其它处理及默认处理 _]~`t+W'DJ  
} CmyCne   
?7 Kl)p3  
5U[m]W=B  
  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。 b4o`eR  
~ ;CnwG   
  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。 {OA2';3  
wxy. &a]  
  二、编程步骤 bb@@QzR  
0s>ozAJ  
  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"; |Tn+Aq7  
q~QB?+ x&  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; J9+< 9g4-t  
'Em5AA`>  
  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; - \ {.]KL  
3i KBVN  
  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; 2$G,pT1J  
@)"= b!q=  
  5、 添加代码,编译运行程序。 $\:;N]Cs~0  
qX,T X 3  
三、程序代码 KmUH([#  
WS17DsWW  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL r$7zk<01  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) m-%.LDqM  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ){~]-VK  
#if _MSC_VER > 1000 y2nwDw(xF  
#pragma once P*9vs%W  
#endif // _MSC_VER > 1000 /)Ga<  
#ifndef __AFXWIN_H__ )#|I(Gz ^  
#error include 'stdafx.h' before including this file for PCH (RhGBgp  
#endif >M`ryM2=D  
#include "resource.h" // main symbols HN7C+e4U~  
class CHookApp : public CWinApp /EW1&  
{ H Pvs~`>V  
 public: J0%e6{C1  
  CHookApp(); 6;JlA})  
  // Overrides  ' ];|  
  // ClassWizard generated virtual function overrides #`kLU:  
  //{{AFX_VIRTUAL(CHookApp) ]Ak/:pu  
 public: %yr(i 6L  
  virtual BOOL InitInstance(); ^p@ #  
  virtual int ExitInstance(); R]Iv?)Y  
  //}}AFX_VIRTUAL g#??Mz   
  //{{AFX_MSG(CHookApp) 86_`Z$ s  
  // NOTE - the ClassWizard will add and remove member functions here. Hu4\4x$?  
  // DO NOT EDIT what you see in these blocks of generated code ! SuorCp]  
  //}}AFX_MSG cN]e{|  
  DECLARE_MESSAGE_MAP() #.Q8q  
}; J%|n^^ /un  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ^nPk;%`0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .|Ee,Un  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xzI?'?duC  
BOOL InitHotkey(); &O&;v|!9  
BOOL UnInit(); sTmY'5ry  
#endif :3oLGiL   
j B.ZF7q  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. dc]D 8KX  
#include "stdafx.h" &@&0n)VTd  
#include "hook.h" TmH'_t.*T~  
#include <windowsx.h> 7BNu.5*y  
#ifdef _DEBUG =~|:93]k  
#define new DEBUG_NEW 0q4E^}iR  
#undef THIS_FILE v +$3Z5  
static char THIS_FILE[] = __FILE__; rhr(uCp/  
#endif xllk hD4F  
#define MAX_KEY 100 h3udS{9 '8  
#define CTRLBIT 0x04 ,sk0){rW  
#define ALTBIT 0x02 <"}Gvi  
#define SHIFTBIT 0x01 i wFI lJ@  
#pragma data_seg("shareddata") FxK2 1  
HHOOK hHook =NULL; Z` ;.62S  
UINT nHookCount =0;  o(q][:,h  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 0Qa kFt  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT KeIk9T13O  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey I7Uj<a=(q  
static int KeyCount =0; @a[Y[F S  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift X6Y<pw`y  
#pragma data_seg() KcW]"K>p!  
HINSTANCE hins; l&2}/A  
void VerifyWindow(); VQMPs{tm  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ^o|Gx  
//{{AFX_MSG_MAP(CHookApp) --t5jSS44  
// NOTE - the ClassWizard will add and remove mapping macros here. rNl` w.  
// DO NOT EDIT what you see in these blocks of generated code! wv6rjg:7  
//}}AFX_MSG_MAP R, J(]ew  
END_MESSAGE_MAP() u#>*"4Q  
L<` p;?   
CHookApp::CHookApp() X (0`"rjg  
{ n>5/y c"/q  
 // TODO: add construction code here, d9E'4Zm  
 // Place all significant initialization in InitInstance p2\mPFxEP  
} w4"4(SR.  
:VB{@ED  
CHookApp theApp; a-9Y &#U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4?vTuZ/ M  
{ ^Hplrwj}  
 BOOL bProcessed=FALSE; |+|q`SwJ  
 if(HC_ACTION==nCode) {dk%j~w8  
 { BPH-g\q  
  if((lParam&0xc0000000)==0xc0000000){// Key up p^yuz (  
   switch(wParam) `62iW3y  
   { VEtdp*ot  
    case VK_MENU: )j^~=Sio.  
     MaskBits&=~ALTBIT; B7R*g,(  
     break; .0gF&>I}  
    case VK_CONTROL: 2/coa+Qkv]  
     MaskBits&=~CTRLBIT; i!U,qV1  
     break; ujt0?DM  
    case VK_SHIFT: 8=!BtMd"  
     MaskBits&=~SHIFTBIT; 1lf 5xm.  
     break; |;[%ZE"  
    default: //judge the key and send message 6')pM&`t  
     break; :hA=(iz  
   } x KZLXQ'e-  
   for(int index=0;index<MAX_KEY;index++){ IL\2?(&Z  
    if(hCallWnd[index]==NULL) ap7ZT7KW  
     continue; 9|}u"jJB%E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {imz1g;  
    { 2L!wbeTb;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); , '_y@9?I  
     bProcessed=TRUE; d8o<Q 9   
    } >;9+4C<z0  
   } tt=JvI9>  
  } *nj={Ss&  
  else if((lParam&0xc000ffff)==1){ //Key down "%~Jb dx  
   switch(wParam) Hfw*\=p  
   { !pwY@} oL  
    case VK_MENU: AxbQN.E  
     MaskBits|=ALTBIT; cKbjW  
     break; v*pN~}5  
    case VK_CONTROL: 2D"n#O`y  
     MaskBits|=CTRLBIT; ]V 4Fm{]  
     break; R'#1|eWCa  
    case VK_SHIFT: AD** 4E  
     MaskBits|=SHIFTBIT; [nx OGa2  
     break; Xv~v=.HNhk  
    default: //judge the key and send message L7}dvdtZ0  
     break; d5hYOhO[  
   } &m8#^]*  
   for(int index=0;index<MAX_KEY;index++) Tgf#I*(^]  
   { G1vg2'A  
    if(hCallWnd[index]==NULL) FM80F_G^z  
     continue; )$.::[pNA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .d4L@{V  
    { Hw(_l,Xf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); l[_ y|W5  
     bProcessed=TRUE; </.9QV  
    } HVq02 Z  
   } z;#DX15Rj  
  } L355uaj  
  if(!bProcessed){ sb]{05:  
   for(int index=0;index<MAX_KEY;index++){ #jc+2F,+{  
    if(hCallWnd[index]==NULL) 5f` a7R  
     continue; d&@>P&AT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +J`HI1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); )37.H^7  
   } MHm=X8eg  
  } *i=+["A  
 } hJ>Kfm  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); >`3wEJ"<  
} 3p%B  
&{x%"Aq/  
BOOL InitHotkey() ]z%X%wL  
{ HZG^o^o1l+  
 if(hHook!=NULL){ `2B,+ytW8  
  nHookCount++; "RkbT O  
  return TRUE; ~"Kf+eFi  
 } 5q.d$K |  
 else }Sxuc/%:  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); x=/`W^t2  
  if(hHook!=NULL) B5nzkJV<X  
   nHookCount++; &?#,rEw<x  
  return (hHook!=NULL); T~238C{vh  
} (Ov{gj^  
BOOL UnInit() -$@$  
{ 5Oa`1?C1  
 if(nHookCount>1){ zm& D #)  
  nHookCount--; j/oM^IY  
  return TRUE; e]1&f.K  
 } DR d|m<Z  
 BOOL unhooked = UnhookWindowsHookEx(hHook); $s*nh>@7  
 if(unhooked==TRUE){ 7lC );  
  nHookCount=0; Mdj?;'Yv  
  hHook=NULL;  c"pI+Q  
 } s!vvAD;\  
 return unhooked; &gDwsW  
} Ve]ufn6  
pd3=^ Zi  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) eaG_)y  
{ j o7`DDb  
 BOOL bAdded=FALSE; q{fgsc8v\  
 for(int index=0;index<MAX_KEY;index++){ 3?R56$-+  
  if(hCallWnd[index]==0){ ?yfw3s  
   hCallWnd[index]=hWnd; d(=*@epjR  
   HotKey[index]=cKey; y@T 0 jI  
   HotKeyMask[index]=cMask; ],?rFK{O  
   bAdded=TRUE; N=JZtf/i  
   KeyCount++; p#]D-?CM)  
   break; fP:n=A{  
  } dGNg[  
 } H}nPaw]G  
 return bAdded; EAdr}io  
} FLb Q#c\  
&B3[:nS2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dN8@ 0AMSf  
{ Q^B !^_M  
 BOOL bRemoved=FALSE; SY[7<BUZ  
 for(int index=0;index<MAX_KEY;index++){ R#n!1~ (  
  if(hCallWnd[index]==hWnd){ &F8N$H  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (=T%eJ61  
    hCallWnd[index]=NULL; (3_m[N\F  
    HotKey[index]=0; AjW5H*  
    HotKeyMask[index]=0; &e-MOM2&  
    bRemoved=TRUE; w~3~:w$  
    KeyCount--; o>#ue<Bc6  
    break; "f1`6cx6  
   } N084k}io  
  } "1-gMob  
 } "8NhrUX  
 return bRemoved; +(pFU\&U3H  
} Z [aKic  
(59u<F  
void VerifyWindow() si!jB%^  
{ bW/^2B  
 for(int i=0;i<MAX_KEY;i++){ ++d%D9*V<  
  if(hCallWnd!=NULL){ (oUh:w.]Gw  
   if(!IsWindow(hCallWnd)){ =B/Ac0Y  
    hCallWnd=NULL; M %vZcP  
    HotKey=0; w]% |^:  
    HotKeyMask=0; S, *  
    KeyCount--; tn\PxT  
   } ]46-TuH  
  } 3jJd)C R  
 } ^w tr~D|  
} pSPVY2qKX  
#C`IfP./  
BOOL CHookApp::InitInstance() 8M_p'AR\,y  
{ {'^!S" 9x  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ,lUroO^^  
 hins=AfxGetInstanceHandle(); *oW^P~m/  
 InitHotkey(); PdkS3Hz  
 return CWinApp::InitInstance(); x,+2k6Wn!  
} hk7kg/"  
}[2|86,G;  
int CHookApp::ExitInstance() v!~ ;Q O  
{ F s{}bQyQ  
 VerifyWindow(); mT3'kUZ}]  
 UnInit(); b14WIgjsl  
 return CWinApp::ExitInstance(); $7'K]'UJXO  
} < 9 vS  
c[6=&  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file pAY[XN  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) FL/395 <:  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ / Ml d.  
#if _MSC_VER > 1000 T l%n|pc  
#pragma once tw*n+{]hi  
#endif // _MSC_VER > 1000 _ft)e3Gf  
WNa#X]*E)  
class CCaptureDlg : public CDialog yaw33/iN  
{ 7XDze(O5  
 // Construction D$vP&7pOr4  
 public: @&4s)&-F  
  BOOL bTray; o<f#Zi  
  BOOL bRegistered; N =0R6{'  
  BOOL RegisterHotkey(); 9si,z  
  UCHAR cKey; 'C")X  
  UCHAR cMask; ~=#jr0IZ  
  void DeleteIcon(); wfJ[" q   
  void AddIcon(); l4LowV7  
  UINT nCount; giNyD4uO  
  void SaveBmp(); E{#Y=  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Ozo)}  
  // Dialog Data $(PWN6{\r^  
  //{{AFX_DATA(CCaptureDlg) L(ni6-  
  enum { IDD = IDD_CAPTURE_DIALOG }; M%#H>X\/  
  CComboBox m_Key; =#Qm D=  
  BOOL m_bControl; #2U4}#Mi  
  BOOL m_bAlt; |#rP~Nj)  
  BOOL m_bShift; S^/:O.X)c,  
  CString m_Path; aN}l&4d  
  CString m_Number; {W5D)  
  //}}AFX_DATA 7K\H_YY8#  
  // ClassWizard generated virtual function overrides 9>1 $Jv3  
  //{{AFX_VIRTUAL(CCaptureDlg) ,VTX7vaH  
 public: V1= (^{p8  
  virtual BOOL PreTranslateMessage(MSG* pMsg); G1`H H&  
 protected: ?\J.Tv $$$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _;x7vRWmN  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); jh*aD=y  
  //}}AFX_VIRTUAL _hy<11S;  
  // Implementation 4-dV%DgC  
 protected: *\5o0~~8J  
  HICON m_hIcon; Jc74A=sT  
  // Generated message map functions *wY { ~zh  
  //{{AFX_MSG(CCaptureDlg) nRL2Z5iO-  
  virtual BOOL OnInitDialog(); `Y5{opG7-  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); F]"Hs>  
  afx_msg void OnPaint(); V.8pxD5 s  
  afx_msg HCURSOR OnQueryDragIcon(); ji~P?5(:  
  virtual void OnCancel(); 5csqu^/y  
  afx_msg void OnAbout(); i H^Gv*  
  afx_msg void OnBrowse(); V,W":&!x  
  afx_msg void OnChange(); DwLl}{r'  
 //}}AFX_MSG NL-<K  
 DECLARE_MESSAGE_MAP() #P''+$5,  
}; Oy `2ccQ#  
#endif yN Bb(!u  
UFED*al#  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ZvS|a~jO  
#include "stdafx.h" k\J 6WT  
#include "Capture.h" &d8z`amP  
#include "CaptureDlg.h" ; {P"~(S%  
#include <windowsx.h> NIQX?|;b{  
#pragma comment(lib,"hook.lib") |4XR [eX  
#ifdef _DEBUG KC`~\sYRN]  
#define new DEBUG_NEW o9Z!Z ^  
#undef THIS_FILE )^ky @V  
static char THIS_FILE[] = __FILE__; o@d+<6Um  
#endif LE" t'R   
#define IDM_SHELL WM_USER+1 w?+v+k\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -5Km 9X8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )/:&i<Q:  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; A>c/q&WUk  
class CAboutDlg : public CDialog u7Xr!d+wR  
{ jC)lWD  
 public: oo:(GfO}  
  CAboutDlg(); WG_20JdJY  
  // Dialog Data  VS:UVe  
  //{{AFX_DATA(CAboutDlg) N9M''H *VS  
  enum { IDD = IDD_ABOUTBOX }; \G}$+  
  //}}AFX_DATA zMXlLRC0  
  // ClassWizard generated virtual function overrides Zy -&g:  
  //{{AFX_VIRTUAL(CAboutDlg) Jhyb{i8RR  
 protected: &d`z|Gx9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4rh*&'  
  //}}AFX_VIRTUAL /cy'% .!  
  // Implementation 7sQw&yUL)  
 protected: Tu'/XUs;k  
  //{{AFX_MSG(CAboutDlg) [;Q8xvVZ'  
  //}}AFX_MSG kJJUu  
  DECLARE_MESSAGE_MAP() G2nL#l~@)  
}; CXQPbt[5  
_PPW9US{  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) .=VtMi$n  
{ buXPeIo^VM  
 //{{AFX_DATA_INIT(CAboutDlg) NjCdkT&g  
 //}}AFX_DATA_INIT Y!kz0([  
} ohdWEU,  
EzDj,!!<w  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6T}bD[h4?  
{ L29,Y=n@  
 CDialog::DoDataExchange(pDX); Uf`lGGM  
 //{{AFX_DATA_MAP(CAboutDlg) Y}bJN%M  
 //}}AFX_DATA_MAP #nE%.k|R~  
} 2 o`a^'Iw  
T41&;?-  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4DVkycM  
 //{{AFX_MSG_MAP(CAboutDlg) *aXZONym  
 // No message handlers ,_ XDCu @  
 //}}AFX_MSG_MAP pr|P#mc"J  
END_MESSAGE_MAP() *nB fF{y  
EBY=ccGE{  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ]U]22I'+$2  
: CDialog(CCaptureDlg::IDD, pParent) ) #/@Jo2F  
{ N#;k;Z'iL  
 //{{AFX_DATA_INIT(CCaptureDlg) CjzfU*G  
  m_bControl = FALSE; No)v&P%  
  m_bAlt = FALSE; cJ G><'  
  m_bShift = FALSE; U}xQUFT|  
  m_Path = _T("c:\\"); zfE;)K^"  
  m_Number = _T("0 picture captured."); d9XX^nY.  
  nCount=0; K_iy^|0)5]  
  bRegistered=FALSE; ZDZPJp,  
  bTray=FALSE; w#Y<~W&  
 //}}AFX_DATA_INIT <qzHMy Ai  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 &(fB+VNrOH  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); x@F"ZiYD@O  
} \o^M,yI  
v/]Bo[a  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) D<[4}og&]  
{ td@F%*  
 CDialog::DoDataExchange(pDX); 5|ih>?C/(  
 //{{AFX_DATA_MAP(CCaptureDlg) 4-`C !q  
  DDX_Control(pDX, IDC_KEY, m_Key); kb?QQ\e  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); }Po&6^  
  DDX_Check(pDX, IDC_ALT, m_bAlt); )-824?Nl:  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); oJK]oVX9i  
  DDX_Text(pDX, IDC_PATH, m_Path); uG\ +`[-{0  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ZpPm>|w  
 //}}AFX_DATA_MAP ,jyNV<dI  
} <CL0@?*i9  
} XCHoB  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) >2 gemTy  
//{{AFX_MSG_MAP(CCaptureDlg) NYD#I{h  
 ON_WM_SYSCOMMAND() guv)[:cd;  
 ON_WM_PAINT() Vtm5&-  
 ON_WM_QUERYDRAGICON() YJ]]6 K+  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 7-+X -Y?  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) +/q%29-k  
 ON_BN_CLICKED(ID_CHANGE, OnChange) :8U=L'4  
//}}AFX_MSG_MAP xtKWh`[&  
END_MESSAGE_MAP() 4J2NIFZ  
$Q1:>i@I|g  
BOOL CCaptureDlg::OnInitDialog() g% :Q86u  
{ MJ >9[hs  
 CDialog::OnInitDialog(); 7t\W{y  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); m~\BkE/[l  
 ASSERT(IDM_ABOUTBOX < 0xF000); v\:>} <gc  
 CMenu* pSysMenu = GetSystemMenu(FALSE); \cvui^^n  
 if (pSysMenu != NULL) !z X`M1J  
 { zbP0!  
  CString strAboutMenu; ;Gxp'y  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 8QDRlF:;<  
  if (!strAboutMenu.IsEmpty()) pL>Q'{7s3  
  { zt!mx{l'  
   pSysMenu->AppendMenu(MF_SEPARATOR); gOa'o<  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 0 8vA;6zt  
  } M cE$=Vv  
 } t#oY|G3O}  
 SetIcon(m_hIcon, TRUE); // Set big icon y[S 5  
 SetIcon(m_hIcon, FALSE); // Set small icon DqrS5!C  
 m_Key.SetCurSel(0); A[v]^pv'  
 RegisterHotkey(); <iiu%   
 CMenu* pMenu=GetSystemMenu(FALSE); =ji p* E^  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); #b []-L!  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); "$PbpY  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); #B|`F?o  
 return TRUE; // return TRUE unless you set the focus to a control E=GCq=Uw  
} ^-PlTmT  
vn~DtTp/  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) k}l5v)m  
{ Yt!UIl\<  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~R7rIP8Wr  
 { p0? X R  
  CAboutDlg dlgAbout; ):jK sP ,  
  dlgAbout.DoModal(); cC1nC76[  
 } ?s#DD,  
 else -MJ6~4k2  
 { :gVz}/C.@  
  CDialog::OnSysCommand(nID, lParam); wqyx{W`~w  
 } %I;ej{*c  
} ]K?z|&N|HK  
fXvJ3w(  
void CCaptureDlg::OnPaint() o\1"ux;b  
{ 8Z:NT_Ss  
 if (IsIconic()) {_|~G|Z  
 { 37x2fnC  
  CPaintDC dc(this); // device context for painting {>fvyF  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); J:)Q)MT24:  
  // Center icon in client rectangle KnbT2  
  int cxIcon = GetSystemMetrics(SM_CXICON); ' wvZnb  
  int cyIcon = GetSystemMetrics(SM_CYICON); yAG4W[  
  CRect rect; 9s6, &'  
  GetClientRect(&rect); 8V`r*:\  
  int x = (rect.Width() - cxIcon + 1) / 2; 8fTuae$^  
  int y = (rect.Height() - cyIcon + 1) / 2; [zn`vT  
  // Draw the icon rOE[c  
  dc.DrawIcon(x, y, m_hIcon); #?YQ&o~gZ  
 } .Gh-T{\V'  
 else /@lXQM9 T  
 { @fRB0m"3  
  CDialog::OnPaint(); @%^JB  
 } DXa!"ZU  
} > eC>sTPQ{  
; _K3/:  
HCURSOR CCaptureDlg::OnQueryDragIcon() &E?TR A# E  
{ mfW}^mu  
 return (HCURSOR) m_hIcon; XsEo tW  
} mG*ER^Y@D  
Bs3M7z RG  
void CCaptureDlg::OnCancel() {i^F4A@=Z  
{ )ep1`n-  
 if(bTray) R<<U(.E  
  DeleteIcon(); |Wg!> g!  
  CDialog::OnCancel(); Nd h  
} /prR;'ks  
si,)!%b  
void CCaptureDlg::OnAbout() {y%|Io`P  
{ u~~H'*EM  
 CAboutDlg dlg; hh[@q*C  
 dlg.DoModal(); ?u4t;  
} .WVIdVO7  
W9G1wU  
void CCaptureDlg::OnBrowse() Qx_]oz]NY  
{ M{jJ>S{g  
 CString str; ,Dy9-o  
 BROWSEINFO bi; m ##_U9O  
 char name[MAX_PATH]; VZ]}9k  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); [OYSNAs *y  
 bi.hwndOwner=GetSafeHwnd(); |Kq<}R  
 bi.pszDisplayName=name; ^ AJ_  
 bi.lpszTitle="Select folder"; .Q!pQ"5  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; _oE 7<  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); bcYGkvGbO  
 if(idl==NULL) +&4@HHU{G  
  return; (-Qr.t_B`  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "!R*f $  
 str.ReleaseBuffer(); jpkKdQX)  
 m_Path=str; wD92Ava   
 if(str.GetAt(str.GetLength()-1)!='\\') ^8=e8O  
  m_Path+="\\"; cz1 m05E  
 UpdateData(FALSE); ?P;=_~X  
} N *,[(q  
wWVB'MRXB,  
void CCaptureDlg::SaveBmp() T}jW,Ost  
{ XG!^[ZDs  
 CDC dc; w :9M6+mM^  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;o?o92d  
 CBitmap bm; ul{D)zm\D  
 int Width=GetSystemMetrics(SM_CXSCREEN); (\%J0kR3[  
 int Height=GetSystemMetrics(SM_CYSCREEN); F8xu&Vk0:  
 bm.CreateCompatibleBitmap(&dc,Width,Height); c1xX)cF  
 CDC tdc; T>irW(  
 tdc.CreateCompatibleDC(&dc); qu0 q LM  
 CBitmap*pOld=tdc.SelectObject(&bm); 7[1 VFc#tf  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); %3yrX>Js  
 tdc.SelectObject(pOld); I9h{fB  
 BITMAP btm; F$S/zh$)0  
 bm.GetBitmap(&btm); ddY-F }z~  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; P! P` MX  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); em2Tet  
 BITMAPINFOHEADER bih; k- exqM2x=  
 bih.biBitCount=btm.bmBitsPixel; l-2lb&n  
 bih.biClrImportant=0; 2RdpVNx\y  
 bih.biClrUsed=0; k>=wwPy  
 bih.biCompression=0; *, R ~[g  
 bih.biHeight=btm.bmHeight; I7C+XUQkQ  
 bih.biPlanes=1; .*?)L3n+t  
 bih.biSize=sizeof(BITMAPINFOHEADER); 4'.] -u  
 bih.biSizeImage=size; X;v{,P=J  
 bih.biWidth=btm.bmWidth; <9x|)2P  
 bih.biXPelsPerMeter=0; X*a7`aL  
 bih.biYPelsPerMeter=0; 2<*Yq 8  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); OqX+ R4S  
 static int filecount=0; D=)qd@,K  
 CString name; d>/4z#R}-  
 name.Format("pict%04d.bmp",filecount++); }mS Q!"f:  
 name=m_Path+name; <)+;Bg  
 BITMAPFILEHEADER bfh; d;a"rq@a)  
 bfh.bfReserved1=bfh.bfReserved2=0; _he~Y2zFz  
 bfh.bfType=((WORD)('M'<< 8)|'B'); v%QC p  
 bfh.bfSize=54+size; V3_qqz}`r  
 bfh.bfOffBits=54; Y5TBWcGU%  
 CFile bf; z.W1Za  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ `KE(R8y  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); YGi_7fTyc=  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); {9hhfI#3_  
  bf.WriteHuge(lpData,size); .>'J ^^  
  bf.Close(); XlGB`P>?KD  
  nCount++; i k0w\*  
 } l4OPzNc'  
 GlobalFreePtr(lpData); L~_zR>  
 if(nCount==1) =OR&,xt  
  m_Number.Format("%d picture captured.",nCount); n4zns,:)/  
 else .\)p3pC)  
  m_Number.Format("%d pictures captured.",nCount); Fh)YNW@  
  UpdateData(FALSE); *JaFt@ x  
} OmP(&t7  
s3M#ua#mX  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg)  *8 ]  
{ 6.4,Qae9E  
 if(pMsg -> message == WM_KEYDOWN) ;"%luQA<w  
 { vaZ?>94  
  if(pMsg -> wParam == VK_ESCAPE) wJF$<f7P  
   return TRUE; OL[_2m*;9p  
  if(pMsg -> wParam == VK_RETURN) wSs78c=  
   return TRUE; Zn'y"@%t[  
 } l1RFn,Tzr  
 return CDialog::PreTranslateMessage(pMsg); X .S8vlb4z  
} PvdR)ZE m  
LZu_-I  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) g? \pH:|79  
{ O11.wLNH  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ m<22E0=g  
  SaveBmp(); u"a$/  
  return FALSE; 4U:+iumy2  
} JGk,u6K7  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ]%%cc  
 CMenu pop; d>7bwG+k  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); iAW oKW  
 CMenu*pMenu=pop.GetSubMenu(0); HjN )~<j  
 pMenu->SetDefaultItem(ID_EXITICON); dzMI5fA<_  
 CPoint pt; ~LzTqMHM  
 GetCursorPos(&pt); *'(dcy9  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); h-h}NCP  
 if(id==ID_EXITICON) :ui1]its4  
  DeleteIcon(); XC{(O:EG  
 else if(id==ID_EXIT) Wkv **X}  
  OnCancel(); HM1y$ej  
 return FALSE; gf2w@CVF>=  
} =U".L  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); rQ$A|GJL  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) zR3Z(^]v  
 AddIcon(); y]\R0lR  
 return res; 9Au+mIN  
} P-`^I`r  
vR~*r6hX8  
void CCaptureDlg::AddIcon() |@-WC.  
{ 5tl}rmI`  
 NOTIFYICONDATA data; C5RDP~au  
 data.cbSize=sizeof(NOTIFYICONDATA); 9e :E% 2  
 CString tip; z?"5= "D  
 tip.LoadString(IDS_ICONTIP); [I4FU7mpH  
 data.hIcon=GetIcon(0); qc'tK6=jp  
 data.hWnd=GetSafeHwnd(); P[nWmY  
 strcpy(data.szTip,tip); gkk< -j'  
 data.uCallbackMessage=IDM_SHELL; Ef`LBAfOO  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; t1Khf  
 data.uID=98; #-HN[U?Gs  
 Shell_NotifyIcon(NIM_ADD,&data); c[y=K)<Z  
 ShowWindow(SW_HIDE); -;`W"&`ss  
 bTray=TRUE; JcVq%~ {M  
} BtHvfoT  
M9OFK\)  
void CCaptureDlg::DeleteIcon() =OZ_\vO  
{ H@j^,  
 NOTIFYICONDATA data; wD,F=O  
 data.cbSize=sizeof(NOTIFYICONDATA); D[#\Y+N  
 data.hWnd=GetSafeHwnd(); !d0@^JbM"  
 data.uID=98; -% f DfjP  
 Shell_NotifyIcon(NIM_DELETE,&data); I3 x}F$^  
 ShowWindow(SW_SHOW); 0\~Zg  
 SetForegroundWindow(); #*]= %-A  
 ShowWindow(SW_SHOWNORMAL); (P>vI'  
 bTray=FALSE; 99:L#0!.W  
} F_Pd\Aq8  
 zm.2L  
void CCaptureDlg::OnChange() er#=xqUY  
{ 1a!h&!$9  
 RegisterHotkey(); v1lj/A  
} ` cv:p|s  
5Q}@Y3 i=  
BOOL CCaptureDlg::RegisterHotkey() H5I#/j  
{ E0pQRGPA  
 UpdateData(); \~H"!vj  
 UCHAR mask=0; -/qrEKQ0U?  
 UCHAR key=0; o<'gM]$  
 if(m_bControl) >lW*%{|b$^  
  mask|=4; z} \9/`  
 if(m_bAlt) I(CI')Q  
  mask|=2; Mww]l[1'EL  
 if(m_bShift) t}FMBG o[  
  mask|=1; T7Ac4LA  
  key=Key_Table[m_Key.GetCurSel()]; /YbL{G )j}  
 if(bRegistered){ ZD{srEa/a  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ^Bb_NcU  
  bRegistered=FALSE; :jX~]1hpmA  
 } ;hvXFU  
 cMask=mask; $S}x'F!4_  
 cKey=key; 0R]CI  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Chup %F  
 return bRegistered; h,+=h;!  
} 1X*T219o  
t_rDXhM  
  四、小结 a=FRJQ8S  
}BrE|'.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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