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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: Wy(pLBmb  
  _j 5N=I{U  
  一、实现方法 > tEK+Y|N}  
G{A)H_o*  
  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: gUGOHd(A  
S'?fJ.  
#pragma data_seg("shareddata") NQ!<f\m4n  
HHOOK hHook =NULL; //钩子句柄 jm> U6  
UINT nHookCount =0; //挂接的程序数目 E{gv,cUM  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ou;qO 5CT  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 hrT%XJl  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey QSmJ`Bm  
static int KeyCount =0; `Z8^+AMc  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 @,YlmX}  
#pragma data_seg() f N0bIE Y  
H56 ^n<tg  
  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。 %uEtQh[  
va>"#;37  
  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: L *{QjH  
OT+Ee  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR i7f%^7!  
cKey,UCHAR cMask) HZuiVW8  
{ fM{1Os  
 BOOL bAdded=FALSE; A^cU$V%?W  
 for(int index=0;index<MAX_KEY;index++){ leIy|K>\m  
  if(hCallWnd[index]==0){ a hwy_\  
   hCallWnd[index]=hWnd; ^5>du~d  
   HotKey[index]=cKey; " <*nZ~nE)  
   HotKeyMask[index]=cMask; bx7\QU+  
   bAdded=TRUE; K>LpN')d  
   KeyCount++; 9ET/I$n  
   break; ixzTJ]yu  
  } {Ve D@  
 } [Gf{f\O  
 return bAdded; fwH`}<o  
} IwM8#6;S~  
//删除热键 _iq2([BpL  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) JE9>8+  
{ wlL8X7+:  
 BOOL bRemoved=FALSE; t]r7cA  
 for(int index=0;index<MAX_KEY;index++){ v\'r Xy  
  if(hCallWnd[index]==hWnd){ H1C%o0CPY  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ dQ`:8S K  
    hCallWnd[index]=NULL; [88{@)  
    HotKey[index]=0; W[GQ[h  
    HotKeyMask[index]=0; _^b@>C>O  
    bRemoved=TRUE; :4iU^6  
    KeyCount--; Hy;901( %  
    break; -HN%B?}. x  
   } '5V^}/  
  } w`0)x5 TGR  
 } ]DU61Z"v?b  
 return bRemoved; S{ey@ X(  
} :Dt\:`(r'  
RZe#|k+ 8  
T|!D>l'  
  DLL中的钩子函数如下: Y!;gQeC  
4XD)E&   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 33,;i E  
{ h*G#<M  
 BOOL bProcessed=FALSE; Gj5>Y!9  
 if(HC_ACTION==nCode) >j) w\i  
 { ;{]8>`im&4  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 joY1(Y  
   switch(wParam) e"PMvQ  
   {  Kc-Y  
    case VK_MENU: Gxo# !  
     MaskBits&=~ALTBIT; n+X1AOE[L  
     break;  :4{Qh  
    case VK_CONTROL: v8>!Gft  
     MaskBits&=~CTRLBIT; o|0 '0P  
     break; Vk WO}  
    case VK_SHIFT: N:OD0m%`)  
     MaskBits&=~SHIFTBIT; k3C"  
     break; Pf{`/UlD  
    default: //judge the key and send message u\:rY)V  
     break; @c0n2 Xcr  
   } (lieiye^  
   for(int index=0;index<MAX_KEY;index++){ mZ~mf->%  
    if(hCallWnd[index]==NULL) 6hLNJ  
     continue; )>?! xx_`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -`Da`ml  
    { A"0wvk)UcY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); J &{qppN  
     bProcessed=TRUE; >H)^6sJ;%b  
    } {zY`h6d  
   } @T5YsX]qb7  
  } sE-x"c  
  else if((lParam&0xc000ffff)==1){ //有键按下 xcw%RUC-  
   switch(wParam) 9^(HXH_f  
   { IvFR <n  
    case VK_MENU: //~POm  
     MaskBits|=ALTBIT; 9jqO/_7R+  
     break; 6aRGG+H  
    case VK_CONTROL: P$6W`^D Z  
     MaskBits|=CTRLBIT; 2rF?Q?$,B  
     break; 4|FRg  
    case VK_SHIFT: \y[Bu^tk  
     MaskBits|=SHIFTBIT; ^v ]UcnB0  
     break; `}[VwQ  
    default: //judge the key and send message 1 pa*T!  
     break; nG!&u1*  
   } KlY,NSlQ  
   for(int index=0;index<MAX_KEY;index++){ #NW Zk.S  
    if(hCallWnd[index]==NULL) -QN1oK@\mE  
     continue; BXNI(7xi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) FwXKRZa  
    { T!Xm")d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 1]_?$)$T  
     bProcessed=TRUE; <"hb#Tn  
    }  <V7SSm  
   } j.<:00<  
  } MRjH40" 2  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 +{5JDyh0  
   for(int index=0;index<MAX_KEY;index++){ 1XqIPiXJ  
    if(hCallWnd[index]==NULL) -)4uYK*  
     continue; U~oBNsU"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1d/NZJ9  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Po'-z<}wS  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 +ylxezc  
   } xOwNCh  
  } tCuN?_ UG  
 } RP,A!pa@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _{lx*dq  
} ;,<r|.6U  
".Lhte R?  
  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: rny@n^F  
q1U&vZ3]c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); i:V0fBR[>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +fC#2%VnU  
/_ $~rW  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 8.*\+nH  
L@>^_p$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \d `dV0X  
{ #L_@s d  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) NS7@8 #C  
 { \R6;Fef  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 E}]I%fi  
  SaveBmp(); oP+kAV#]  
  return FALSE; TTeAa  
 } n33JTqX  
 …… //其它处理及默认处理 1y},9ym  
} [B}1z  
7k'=Fm6za  
[SCw<<l<  
  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。 t)\D  
hZp=BM"bJ  
  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]sTX9  
'q{PtYr  
  二、编程步骤 >(IITt  
/1IvLdPIu  
  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"; 6.7`0v?,n  
&?KPu?9  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 4C l, Iw/;  
^;0~6uBEJr  
  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 @_eFlT t  
Bv2z4D4f+  
  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; +L^A:}L(  
(iHf9*i CV  
  5、 添加代码,编译运行程序。 AeNyZ[40T  
HF*j`}  
三、程序代码 B`g<Ge~  
Q mb[ e>  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Am>_4  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) s$f+/Hs  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ >E//pr)_Km  
#if _MSC_VER > 1000 cEDDO&u  
#pragma once @J~ lV\  
#endif // _MSC_VER > 1000 k)N2 +/  
#ifndef __AFXWIN_H__ <bEN8b  
#error include 'stdafx.h' before including this file for PCH n%83jep9  
#endif X)`(nj  
#include "resource.h" // main symbols xDPQG`6  
class CHookApp : public CWinApp /Oq1q._9F  
{ hg[l{)Q  
 public: *4(/t$)pEl  
  CHookApp(); XX]5T`D  
  // Overrides "\VW. S  
  // ClassWizard generated virtual function overrides GOv9 2$e  
  //{{AFX_VIRTUAL(CHookApp) y+K7WUwhq  
 public: c*y$bf<  
  virtual BOOL InitInstance(); LVPt*S=/  
  virtual int ExitInstance(); K!IF?iell  
  //}}AFX_VIRTUAL OSSd;ueur$  
  //{{AFX_MSG(CHookApp) *23m-  
  // NOTE - the ClassWizard will add and remove member functions here. 1_Dn?G^H  
  // DO NOT EDIT what you see in these blocks of generated code ! 7sQ]w   
  //}}AFX_MSG B6tcKh9d,  
  DECLARE_MESSAGE_MAP() S[W9G)KWp  
}; t 3(%UB  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); o~i]W.SI(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [47K7~9p  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^>,< *p  
BOOL InitHotkey(); v YRt2({}Z  
BOOL UnInit(); +zFV~]b  
#endif , aRJ!AZ  
kWZ/ej  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. jOoIF/So  
#include "stdafx.h" j33P~H~  
#include "hook.h" *=-__|t  
#include <windowsx.h> Ee t+  
#ifdef _DEBUG MZUF! B  
#define new DEBUG_NEW dD/29b(  
#undef THIS_FILE s,UN'~e1  
static char THIS_FILE[] = __FILE__; l|@/?GaH  
#endif ;4-p upK~%  
#define MAX_KEY 100 m [g< K  
#define CTRLBIT 0x04 |QAeQWP+1  
#define ALTBIT 0x02 &=s|  
#define SHIFTBIT 0x01 6e$sA (a=i  
#pragma data_seg("shareddata") xJ[k#?T'  
HHOOK hHook =NULL; aBqe+FXp4  
UINT nHookCount =0; l5\B2 +}7  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey mV:RmA  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT (ybtXoQs  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey br34Eh  
static int KeyCount =0; O?C-nw6kP  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Sy+]SeF&  
#pragma data_seg() Uy$U8b-ov  
HINSTANCE hins; !7IT~pO`  
void VerifyWindow(); }5o~R~H  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) U:mq7Rd8  
//{{AFX_MSG_MAP(CHookApp) PBxK>a  
// NOTE - the ClassWizard will add and remove mapping macros here. v@$evmA  
// DO NOT EDIT what you see in these blocks of generated code! 'f=)pc#&g  
//}}AFX_MSG_MAP D&z'tf5  
END_MESSAGE_MAP() jm#d7@~4  
b2/N H1A  
CHookApp::CHookApp() :f?,]|]+-  
{ 7"a`-]Ap  
 // TODO: add construction code here, APHtJoS  
 // Place all significant initialization in InitInstance +!L_E6pyXE  
} ? BHWzo!  
1WUFk?p  
CHookApp theApp; *f0.=?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )AnlFO+V  
{ h30QCk  
 BOOL bProcessed=FALSE; DJ mQZ+{2  
 if(HC_ACTION==nCode) Y2=Brtc[@  
 { Oi kU$~|  
  if((lParam&0xc0000000)==0xc0000000){// Key up F(KH-  
   switch(wParam) SCfkv|hO  
   { DuO%B  
    case VK_MENU: S1H47<)UF  
     MaskBits&=~ALTBIT; zulf%aaL  
     break; +2;#9aa I  
    case VK_CONTROL: YmO"EWb  
     MaskBits&=~CTRLBIT; .UT,lqEkv  
     break; {0A[v}X ~  
    case VK_SHIFT: hVT=j ?~  
     MaskBits&=~SHIFTBIT; #czyr@  
     break; -~<q,p"e  
    default: //judge the key and send message :]u}x Dv3  
     break; Ry8WNVO}R  
   } 7/^TwNsv  
   for(int index=0;index<MAX_KEY;index++){ ~q8V<@?  
    if(hCallWnd[index]==NULL) Zv1Bju*y  
     continue; 8aZey_Hw;+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sO{0hZkc  
    { -_{C+Y_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); l $p_])x  
     bProcessed=TRUE; (Qx-KRH  
    } h87L8qh9  
   } h-2E9Z  
  } p E(<XD3Q  
  else if((lParam&0xc000ffff)==1){ //Key down L6rs9su=7  
   switch(wParam) (. quX@w"m  
   { ,rH)}C<Q+  
    case VK_MENU: /v bO/Mr  
     MaskBits|=ALTBIT; RXx?/\~yd;  
     break; /SPAJHh  
    case VK_CONTROL: 3I>S:|=K  
     MaskBits|=CTRLBIT; ^7~SS2t!  
     break; _Y ><ih  
    case VK_SHIFT: 0'\FrG  
     MaskBits|=SHIFTBIT; [KimY  
     break; PO%yWns30o  
    default: //judge the key and send message < o'7{  
     break; p+`*~6Jj/  
   } '.h/Y/oz  
   for(int index=0;index<MAX_KEY;index++) _V7^sk!  
   { -;@5Ua1uf  
    if(hCallWnd[index]==NULL) t5X^(@q4N  
     continue; CJ}@R.Zy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cT>z  
    { U3_yEvZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); q*RaX 4V  
     bProcessed=TRUE; ltr;pc*)  
    } !7ZfT?&  
   } bW 86Iw  
  } j6R{  
  if(!bProcessed){ 0IPhVG~#  
   for(int index=0;index<MAX_KEY;index++){ >+; b>  
    if(hCallWnd[index]==NULL) 4M0v1`k  
     continue; (!>g8=`"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Pv2nV!X6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >Rki[SNb-b  
   } 7u`}t83a  
  } #hE3~+ i  
 } W &0@&U  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); XJxs4a1[t  
} G%p!os\>  
d WB8  
BOOL InitHotkey() %B {D  
{ ZTBFV/{  
 if(hHook!=NULL){ E!}-qbH^  
  nHookCount++; S!I <m&Cgc  
  return TRUE; vU$O{|J  
 } qs c-e,rl  
 else >nIcF m  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); L1Cn  
  if(hHook!=NULL) ~g4rGz  
   nHookCount++; mk`cyN>m  
  return (hHook!=NULL); &W!d}, ;  
} a5U2[Ko80  
BOOL UnInit() ^d5./M8Bd  
{ 7]. IT(  
 if(nHookCount>1){ 3 ?|; on  
  nHookCount--; MY<!\4/  
  return TRUE; AXU!-er$  
 } Acq>M^E3  
 BOOL unhooked = UnhookWindowsHookEx(hHook); |L_g/e1A3  
 if(unhooked==TRUE){ cdtzf:#q  
  nHookCount=0; ZvnZ}t >?  
  hHook=NULL; 1M~:]}*<  
 } %`\3V {2*  
 return unhooked; /"%IhX-  
} Lx:9@3'7'  
dpGQ0EzH^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) P!6e  
{ E=1/  
 BOOL bAdded=FALSE; Q!+{MsZ  
 for(int index=0;index<MAX_KEY;index++){ &v9PT!R~  
  if(hCallWnd[index]==0){ ,md7.z]U~  
   hCallWnd[index]=hWnd; q/2K=BOh  
   HotKey[index]=cKey; xZ'` _x9l  
   HotKeyMask[index]=cMask; 9uq+Ve>  
   bAdded=TRUE; 8apKp?~yW  
   KeyCount++; Hj4w i|  
   break; x+:,b~Skk  
  } 2wuW5H8w{  
 } zUUxxS_?  
 return bAdded; _~S^#ut+  
} W Pp\sIP  
"MS`d+rf\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) l6DIsR  
{ xc]C#q  
 BOOL bRemoved=FALSE; $:gSc &mx  
 for(int index=0;index<MAX_KEY;index++){ wyzBkRg.  
  if(hCallWnd[index]==hWnd){ komxot[[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 6$vh qg}f  
    hCallWnd[index]=NULL; < ,cIc]eX  
    HotKey[index]=0; \,bFm,kC?  
    HotKeyMask[index]=0; Y %D*O  
    bRemoved=TRUE; >A(?Pn{|a  
    KeyCount--; qT>& v_<  
    break; DdS3<3]A  
   } !e\R;bYM  
  } d t0E0i  
 } +i_f.Ipp  
 return bRemoved; / -qt}  
} X$h~d8@r  
|XdrO  
void VerifyWindow() F']%q 0  
{ ND9>`I 5  
 for(int i=0;i<MAX_KEY;i++){ rIWN!@.J  
  if(hCallWnd!=NULL){ h`;F<PFW  
   if(!IsWindow(hCallWnd)){ 1> @|  
    hCallWnd=NULL; F-7b`cF9[r  
    HotKey=0; KsU&<eQ  
    HotKeyMask=0; {_X1&&>8/  
    KeyCount--; "O1*uwm  
   } 6p]R)K>wS  
  } 79B`w #  
 } |`;1p@w"  
} ^sn>p}Tg  
"`gZ y)E  
BOOL CHookApp::InitInstance() *0@; kD=  
{ $No>-^ )  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); |e; z"-3  
 hins=AfxGetInstanceHandle(); >iWf7-:  
 InitHotkey(); Cv(N5mA2  
 return CWinApp::InitInstance(); Ho8.-QSG  
} {ugKv?e ;  
*9{Wn7pck/  
int CHookApp::ExitInstance() %TTL^@1!b  
{ {*Wwu f.  
 VerifyWindow(); )I-?zyL  
 UnInit(); iXS-EB/  
 return CWinApp::ExitInstance(); }~~^ZtJ\  
} )7%]<2V%  
=?*"V-l  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file a;owG/\p  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) .,K?\WZ  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~0r.3KTl"Y  
#if _MSC_VER > 1000 KY34 'Di  
#pragma once 7{6.  
#endif // _MSC_VER > 1000 l=?y=2+  
4N=Ie}_`  
class CCaptureDlg : public CDialog l3#dfW{  
{ M9jo<+  
 // Construction TvG:T{jwy  
 public: gsm^{jB  
  BOOL bTray; U\ E{-7  
  BOOL bRegistered; >A( C9_\  
  BOOL RegisterHotkey(); C2|2XL'l(C  
  UCHAR cKey; Xg3[v3m|  
  UCHAR cMask; $AhX@|?z  
  void DeleteIcon(); 4m(>"dHP  
  void AddIcon(); @ZPTf>J}  
  UINT nCount; k^\ &.63(  
  void SaveBmp(); 3udIe$.Q  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ?BvI/H5d  
  // Dialog Data j!o3g;j  
  //{{AFX_DATA(CCaptureDlg) ` +UMZc  
  enum { IDD = IDD_CAPTURE_DIALOG }; y-q?pqt  
  CComboBox m_Key; o9d$ 4s@/  
  BOOL m_bControl; ;Hp'x_xQ  
  BOOL m_bAlt; *vE C,)  
  BOOL m_bShift; TY[d%rMm  
  CString m_Path; 0HuRFl  
  CString m_Number; n:."ZBtY*  
  //}}AFX_DATA $ 14DTjj  
  // ClassWizard generated virtual function overrides Y"rV[oe   
  //{{AFX_VIRTUAL(CCaptureDlg) "t&k{\$\  
 public: 207oE O]  
  virtual BOOL PreTranslateMessage(MSG* pMsg); i/Lq2n3 )  
 protected: {,2_K6#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support EAXU{dRV  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); LP6FSo~K  
  //}}AFX_VIRTUAL q/-j`'A_pb  
  // Implementation "g1;TT:1~  
 protected: +F&]BZ  
  HICON m_hIcon; +ENW=N  
  // Generated message map functions y1My, ?"?  
  //{{AFX_MSG(CCaptureDlg) b!~%a  
  virtual BOOL OnInitDialog(); g*.(! !  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); aDv/kFfn  
  afx_msg void OnPaint(); -mw \?\2{  
  afx_msg HCURSOR OnQueryDragIcon(); q &6=oss!  
  virtual void OnCancel(); ?,DbV|3 _\  
  afx_msg void OnAbout(); Hf!4(\yN  
  afx_msg void OnBrowse(); ER0#$yFpM  
  afx_msg void OnChange(); Cwf$`?|W  
 //}}AFX_MSG Rj;e82%%N  
 DECLARE_MESSAGE_MAP() "UnSZ[;t  
}; .ehvhMuG|  
#endif Vy~$%H94  
fQ4$@  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file q=i<vcw  
#include "stdafx.h" LK/V]YG  
#include "Capture.h" n$Fm~iPo,  
#include "CaptureDlg.h" H{zuIN/.1  
#include <windowsx.h> oxXW`C<  
#pragma comment(lib,"hook.lib") 0BE^qe  
#ifdef _DEBUG ByvqwJY  
#define new DEBUG_NEW Y[?Wt/O;  
#undef THIS_FILE arL&^]JnZ,  
static char THIS_FILE[] = __FILE__; |Z|xM  
#endif 8%f! X51  
#define IDM_SHELL WM_USER+1 U(LR('-h  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |L{dQ)-'l  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =e{KtX.  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; &'\+Z  
class CAboutDlg : public CDialog 6YGr"Kj &  
{ gF5EtdN?|  
 public: V46[whL%r  
  CAboutDlg(); &7u Ra1/R  
  // Dialog Data # h|< >  
  //{{AFX_DATA(CAboutDlg) \9zC?Cw  
  enum { IDD = IDD_ABOUTBOX }; BF|FW  
  //}}AFX_DATA OBQ!0NM_b  
  // ClassWizard generated virtual function overrides {;M/J  
  //{{AFX_VIRTUAL(CAboutDlg) iPpJ`i#@+  
 protected: t3JPxg]0k'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support v 8a  
  //}}AFX_VIRTUAL _'p;V[(+M  
  // Implementation !$# 4D&T  
 protected: f(o`=% k8  
  //{{AFX_MSG(CAboutDlg) Lf M(DK  
  //}}AFX_MSG rqJj!{<B  
  DECLARE_MESSAGE_MAP() 3h4"Rv=,  
}; )!-'SH  
|T&#"q,i9%  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Lb 4!N` l  
{ P"@^'yR5WK  
 //{{AFX_DATA_INIT(CAboutDlg) S`@*zQ  
 //}}AFX_DATA_INIT :]hfmWC   
} 1V?)zp  
a Z, Wa-k  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 0EU4irMa  
{ @sO.g_yM  
 CDialog::DoDataExchange(pDX); Z@A1+kUS  
 //{{AFX_DATA_MAP(CAboutDlg) |XG7UH  
 //}}AFX_DATA_MAP Kp;o?5H  
} Xrn~ ]P7  
nz l,y,  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) p:%E>K1<  
 //{{AFX_MSG_MAP(CAboutDlg) ^ ?9 ~R"  
 // No message handlers XX6)(  
 //}}AFX_MSG_MAP 5] %kWV>  
END_MESSAGE_MAP() %&(\dt&R1h  
'#6DI"vJ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) z# B) b5  
: CDialog(CCaptureDlg::IDD, pParent) kA`qExw%  
{ d^^>3L!h  
 //{{AFX_DATA_INIT(CCaptureDlg) Lr&BZM  
  m_bControl = FALSE; }C#d;JC  
  m_bAlt = FALSE; k"zHrn"$  
  m_bShift = FALSE; 5L#M7E  
  m_Path = _T("c:\\"); kICYPy  
  m_Number = _T("0 picture captured."); 3i~{x[Jc  
  nCount=0; 42LV>X#i  
  bRegistered=FALSE; Fj4:_(%nG  
  bTray=FALSE; tjt#VFq?  
 //}}AFX_DATA_INIT m#'9)%t!J  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 A79SAheX#  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 6V/mR~F1r  
} 6 dMpd4"\  
WLH2B1_):  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) R8*4E0\br  
{ XW:(FzF  
 CDialog::DoDataExchange(pDX); 5w3'yA<vE  
 //{{AFX_DATA_MAP(CCaptureDlg) omP 7|  
  DDX_Control(pDX, IDC_KEY, m_Key); 8/v_uEG  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 2Y{9Df  
  DDX_Check(pDX, IDC_ALT, m_bAlt); !>j- j  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); >=Veu; A  
  DDX_Text(pDX, IDC_PATH, m_Path); 0IuU4h5Fr  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ly+7klQ;.  
 //}}AFX_DATA_MAP B4=gMVp1  
} enM 3  
6m&I_icM  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) J( 60eTwQ  
//{{AFX_MSG_MAP(CCaptureDlg) VF.S)='>Eu  
 ON_WM_SYSCOMMAND() v<4zcMv  
 ON_WM_PAINT() 4r$t}t gX  
 ON_WM_QUERYDRAGICON() n2~rrQ \/p  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) UqbE  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) %+}\i'j7  
 ON_BN_CLICKED(ID_CHANGE, OnChange) -xlI'gNg7  
//}}AFX_MSG_MAP 3{z }[@N  
END_MESSAGE_MAP() >EjBk nl  
b-XBs7OAx  
BOOL CCaptureDlg::OnInitDialog() FliN@RNo  
{ "`zw(  
 CDialog::OnInitDialog(); 9UX-)!  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); j^M@0o  
 ASSERT(IDM_ABOUTBOX < 0xF000); S1JB]\  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ga1RMRu+  
 if (pSysMenu != NULL) EIAT*l:NW  
 { HAXx`r<  
  CString strAboutMenu; [gDvAtTZ5  
  strAboutMenu.LoadString(IDS_ABOUTBOX); /hHD\+0({  
  if (!strAboutMenu.IsEmpty()) O.!?O(  
  { RIlPH~  
   pSysMenu->AppendMenu(MF_SEPARATOR); Zzs pE}  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); DlP=R  
  } j43HSY7@  
 } xhv)rhu@  
 SetIcon(m_hIcon, TRUE); // Set big icon = 8n*%NC  
 SetIcon(m_hIcon, FALSE); // Set small icon ]up:pddIh  
 m_Key.SetCurSel(0); Bvwk6NBN  
 RegisterHotkey(); h2 y@xnn  
 CMenu* pMenu=GetSystemMenu(FALSE); I| hG"i  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); =`")\?z}  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 42~;/4  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); hLF@'ln  
 return TRUE; // return TRUE unless you set the focus to a control LT!4pD:a  
} .u)YZN0\  
5UqCRz<,R  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Z|.. hZG  
{ y g7z?AZ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) =y ff.3mW\  
 { 99x]DY  
  CAboutDlg dlgAbout; <K~#@.^`  
  dlgAbout.DoModal(); |<S9nZg%p  
 } (fl2?d5+C  
 else rmhB!Lo  
 { ;X>KP,/r$  
  CDialog::OnSysCommand(nID, lParam); u:k#1Nn!  
 } Ty5\zxC|  
} i^(0,L  
I]h+24_S  
void CCaptureDlg::OnPaint() wTLHg2'y^  
{ `S2=LJ  
 if (IsIconic()) |Ia46YS  
 { ;tj_vmZ@R  
  CPaintDC dc(this); // device context for painting G{:L^2>  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); PGJ?=qXr#  
  // Center icon in client rectangle cCwT0O#d  
  int cxIcon = GetSystemMetrics(SM_CXICON); w% M0Mu  
  int cyIcon = GetSystemMetrics(SM_CYICON); DF#Ob( 1  
  CRect rect; 7be?=c)+"  
  GetClientRect(&rect); ) ":~`Z*@  
  int x = (rect.Width() - cxIcon + 1) / 2; }9'rTLM  
  int y = (rect.Height() - cyIcon + 1) / 2; Jyn>:Yq(  
  // Draw the icon nHhg#wR  
  dc.DrawIcon(x, y, m_hIcon); phTZUm i  
 } G[jCmkK  
 else *fx<>aK  
 { nBQG.3  
  CDialog::OnPaint(); }=++Lr4*  
 } m{' q(w}  
} }b44^iL$9y  
tNtP+v-{  
HCURSOR CCaptureDlg::OnQueryDragIcon()  ^rI&BN@S  
{ Pai{?<zGi  
 return (HCURSOR) m_hIcon; b"J(u|Du`  
} j1g^Q$B>m  
7oUYRqd  
void CCaptureDlg::OnCancel() w>#~_x, `  
{ +Q{jV^IT9  
 if(bTray) (2S,0MHk  
  DeleteIcon(); 7eY*Y"GX  
  CDialog::OnCancel(); >_R5Li  
} h><;TAp  
'&\km~&  
void CCaptureDlg::OnAbout() _M 7AQ5  
{ Lz4iLLP  
 CAboutDlg dlg; fO9e ;  
 dlg.DoModal(); ^ c:(HUo#  
} Hkpn/,D5  
6$IAm#  
void CCaptureDlg::OnBrowse() q4VOK 'N  
{ LJT+tb?K  
 CString str; >%xJ e'  
 BROWSEINFO bi; QkA79%;j  
 char name[MAX_PATH]; @o8\`G  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); .L8S_Mz  
 bi.hwndOwner=GetSafeHwnd(); _m@QeO'yh  
 bi.pszDisplayName=name; K'y;j~`-  
 bi.lpszTitle="Select folder"; jn]{|QZ  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; )@Ly{cw   
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ?g!py[CrE  
 if(idl==NULL) norWNm(n  
  return; W"$'$ h  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); :?&N/ 7  
 str.ReleaseBuffer(); 7D4P= $UJp  
 m_Path=str; }F-WOQ  
 if(str.GetAt(str.GetLength()-1)!='\\') /QG8\wXE2  
  m_Path+="\\"; #b:8-Lt:M  
 UpdateData(FALSE); kz+P?mopm  
} Hl]3F^{  
.' #_Z.zr  
void CCaptureDlg::SaveBmp() ^oj)#(3C  
{ =6/0=a[  
 CDC dc; r..\(r  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Riw#+#r]/  
 CBitmap bm; o XA*K.X<  
 int Width=GetSystemMetrics(SM_CXSCREEN); }9jy)gF*e  
 int Height=GetSystemMetrics(SM_CYSCREEN); \acjv|]  
 bm.CreateCompatibleBitmap(&dc,Width,Height); gVk_<;s  
 CDC tdc; +oeO 0  
 tdc.CreateCompatibleDC(&dc); w$pBACX  
 CBitmap*pOld=tdc.SelectObject(&bm); [CJ&Yz Ji  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 0IxXhu6v  
 tdc.SelectObject(pOld); @2]_jW  
 BITMAP btm; JhIgq W2  
 bm.GetBitmap(&btm); S's\M5  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 7\eN 8+  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); -k= 02?0p+  
 BITMAPINFOHEADER bih; we!}"'E;  
 bih.biBitCount=btm.bmBitsPixel; C;M.dd  
 bih.biClrImportant=0; nxCwg>  
 bih.biClrUsed=0; rk{DrbRx  
 bih.biCompression=0; <1>\?$)D  
 bih.biHeight=btm.bmHeight; nJlrBf_Kj  
 bih.biPlanes=1; rE EWCt  
 bih.biSize=sizeof(BITMAPINFOHEADER); AW1691Q  
 bih.biSizeImage=size; }_Jr[iaB  
 bih.biWidth=btm.bmWidth; h0L *8P`t  
 bih.biXPelsPerMeter=0; h`,dg%J*B  
 bih.biYPelsPerMeter=0; [<7Hy,xr_  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); cOq^}Ohan  
 static int filecount=0; _da>=^hFJ  
 CString name; Kr!8H/Z  
 name.Format("pict%04d.bmp",filecount++); Xh;Pbm|K  
 name=m_Path+name; t(}\D]mj  
 BITMAPFILEHEADER bfh; R6*:Us0\FJ  
 bfh.bfReserved1=bfh.bfReserved2=0; Pqi>,c<&mL  
 bfh.bfType=((WORD)('M'<< 8)|'B'); noV]+1#"V  
 bfh.bfSize=54+size; =.f]OWehu.  
 bfh.bfOffBits=54; (@>X!]{$  
 CFile bf; x<4-Q6'{S  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ nJNdq`y2  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Rcfh*"k  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Q3*@m  
  bf.WriteHuge(lpData,size); !0{":4 \  
  bf.Close(); ?dY}xE  
  nCount++; TIYI\/a\;  
 } YD 1u  
 GlobalFreePtr(lpData); x/ lW=EQ  
 if(nCount==1) XzIhFX6  
  m_Number.Format("%d picture captured.",nCount); G BV]7.  
 else tgKmC I  
  m_Number.Format("%d pictures captured.",nCount); ,~p'p)  
  UpdateData(FALSE); VD#`1g<  
} |W<wPmW_{+  
d~u+:[\=/  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) B>Mr /'  
{ x!"S`AM  
 if(pMsg -> message == WM_KEYDOWN) qQv?J]l  
 { =rFgOdj  
  if(pMsg -> wParam == VK_ESCAPE) 3FR'N%+  
   return TRUE; <sE0426 {  
  if(pMsg -> wParam == VK_RETURN) @.6l^"L  
   return TRUE; c%n[v3]  
 } sFqZ@t}~  
 return CDialog::PreTranslateMessage(pMsg); ;Z\jX[H  
} % V/J6  
]W-l1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) e?rp$kq7  
{ nJ<h}*[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ > r6`bh [4  
  SaveBmp(); Zu951+&`  
  return FALSE; (hEqh nnm`  
} g-q~0  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ,dOd3y'y  
 CMenu pop; wM8Gz.9,  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Pfj{TT.#L  
 CMenu*pMenu=pop.GetSubMenu(0); ~&8ag`  
 pMenu->SetDefaultItem(ID_EXITICON); M#c.(QdF  
 CPoint pt; -}_-#L!Q  
 GetCursorPos(&pt); -SnP+X!  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); r~N0P|Tq  
 if(id==ID_EXITICON) <05\  
  DeleteIcon(); ^NKB  
 else if(id==ID_EXIT) *_ {w0U)  
  OnCancel(); |#fqHON  
 return FALSE; )o-rg  
} HdQd =q(  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ~_OtbNj#  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) `VM@-;@w  
 AddIcon(); !)FM/Xj,o  
 return res; 8p p^ w  
} 4RTuy+ M  
W7r1!/ccj  
void CCaptureDlg::AddIcon() C%}}~Y  
{ gh>'O/9  
 NOTIFYICONDATA data; <1cYz\/ !M  
 data.cbSize=sizeof(NOTIFYICONDATA); yu"enA  
 CString tip; ZbD_AP  
 tip.LoadString(IDS_ICONTIP); r PWn  
 data.hIcon=GetIcon(0); ^dj avJ  
 data.hWnd=GetSafeHwnd(); O+~.p  
 strcpy(data.szTip,tip); eAR]~ NiW  
 data.uCallbackMessage=IDM_SHELL; , g\%P5  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; D^V0kC p!F  
 data.uID=98; _7Z|=)  
 Shell_NotifyIcon(NIM_ADD,&data); AC :cV='  
 ShowWindow(SW_HIDE); 7m3|2Qv  
 bTray=TRUE; T>,3V:X  
} s_xWvx8?4.  
_PUgK\  
void CCaptureDlg::DeleteIcon() 8:E)GhX  
{ .cJWYMC  
 NOTIFYICONDATA data; MdM^!sk&`  
 data.cbSize=sizeof(NOTIFYICONDATA); )D?\ru H  
 data.hWnd=GetSafeHwnd(); / V}>v  
 data.uID=98; 'i#m%D`dt  
 Shell_NotifyIcon(NIM_DELETE,&data); |>(d^<nR^v  
 ShowWindow(SW_SHOW); X~wkqI#d%E  
 SetForegroundWindow();  JsAl;w  
 ShowWindow(SW_SHOWNORMAL); 1ga.%M*  
 bTray=FALSE; c]3% wL  
} Y?G\@ 6  
$J}d6%   
void CCaptureDlg::OnChange() @y?<Kv}s  
{  &0! f_  
 RegisterHotkey(); 4Rj;lAlwB  
} s}yJkQb  
KKpO<TO  
BOOL CCaptureDlg::RegisterHotkey() @=4K%SCw  
{ \l)<NZ\  
 UpdateData(); ODa+s>a`^  
 UCHAR mask=0; X-,scm  
 UCHAR key=0; 3{OY&   
 if(m_bControl) ,Yx"3i,  
  mask|=4; L7oLV?k  
 if(m_bAlt) jzCSxuZ7O  
  mask|=2; 2 |lm'Hf  
 if(m_bShift) U,Py+c6  
  mask|=1; ;o* n*N  
  key=Key_Table[m_Key.GetCurSel()]; 5MUM{(C  
 if(bRegistered){ G=?2{c}U  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); (3PkTQlE  
  bRegistered=FALSE; -XNjyXm2  
 } k+Ew+j1_  
 cMask=mask; =[{YI2S  
 cKey=key; 78a!@T1#  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask);  "";[U  
 return bRegistered; W+N9~.q\^  
} #lDf8G|ST~  
"o" ujQ(v  
  四、小结 4wfT8CL  
/'vCO |?L  
  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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