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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: z}tp0~C  
  \>`$x:  
  一、实现方法 an`(?6d  
(NC>[  
  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: e:D"_B  
9y*! W  
#pragma data_seg("shareddata") DOIWhd5:  
HHOOK hHook =NULL; //钩子句柄 -\$cGIL  
UINT nHookCount =0; //挂接的程序数目 jFT V\|C  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 26VdRy{[  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 XL=R]IC<.  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey gVJ#LJ  
static int KeyCount =0; `UK+[`E  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 BQ:Kx_   
#pragma data_seg() L)'rM-nkFh  
15 11<,  
  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。 "BfmX0&?  
73ljW  
  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: ==Mi1Q#5C  
5 hadA>d  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Hk*cO;c  
cKey,UCHAR cMask) O9X:1>a@i  
{ D>e\OfTR:  
 BOOL bAdded=FALSE; C'2 =0oou  
 for(int index=0;index<MAX_KEY;index++){ Pq>[q?>?  
  if(hCallWnd[index]==0){ ~+ wamX3  
   hCallWnd[index]=hWnd; g Pj0H&,.  
   HotKey[index]=cKey; J8BT%  
   HotKeyMask[index]=cMask; :_a]T-GL  
   bAdded=TRUE; 1 " 7#|=1/  
   KeyCount++; /B\-DP3K  
   break; tB=D&L3  
  } N pND/  
 } cu`J2vm3  
 return bAdded; vW-`=30  
} T$8~9 qx  
//删除热键 "HfU,$[  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) L{A-0Ffh  
{ PbHh?iH  
 BOOL bRemoved=FALSE; }lTZq|;A  
 for(int index=0;index<MAX_KEY;index++){ xyjV dD\  
  if(hCallWnd[index]==hWnd){ e=z_+gVm  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [ky6E*dV`  
    hCallWnd[index]=NULL; {3(.c, q@  
    HotKey[index]=0; Z;~[@7`  
    HotKeyMask[index]=0; 9Y%?)t.2  
    bRemoved=TRUE; zHOE.V2Qo  
    KeyCount--; HU[nN*  
    break; ou^nzm  
   } n_n|^4 w  
  } }R&5qpl  
 } %s@S|< W  
 return bRemoved; %"[dGB$S  
} X/8iJ-KB  
?wf+{x-dPP  
_6UAeZ*M  
  DLL中的钩子函数如下: <I%9O:R  
+aw>p_\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Ji:iKkI  
{ 4<Sa,~4  
 BOOL bProcessed=FALSE; 7 Y>`-\  
 if(HC_ACTION==nCode) MR_bq_)  
 { RjGB#AK  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 :-\ yy  
   switch(wParam) IqCCfsf4  
   {  )uid!d  
    case VK_MENU: {ogZT7w}  
     MaskBits&=~ALTBIT; Dp*$GQ  
     break; Kxl,] |e>  
    case VK_CONTROL: gGX0+L@E  
     MaskBits&=~CTRLBIT; P b8Z))9j  
     break; 1!(%<R  
    case VK_SHIFT: >6I.%!jU  
     MaskBits&=~SHIFTBIT; !UMo4}Y  
     break; aR)en{W  
    default: //judge the key and send message V9E6W*IE  
     break; Lkl|4L   
   } x:?a;muf  
   for(int index=0;index<MAX_KEY;index++){ '#N5i  
    if(hCallWnd[index]==NULL) Hg9.<|+yo  
     continue; _0W;)v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |[37:m  
    { p + l_MB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); C. Ja;RFq  
     bProcessed=TRUE; O GFE*  
    } ~` \9Q  
   } y2#>c*  
  } 7 ZL#f![{  
  else if((lParam&0xc000ffff)==1){ //有键按下 {y^|ET7  
   switch(wParam) crNjI`%tw  
   { _MdZDhtm  
    case VK_MENU: 5{FM#@  
     MaskBits|=ALTBIT; [Yy\>  
     break; ?ng14e  
    case VK_CONTROL: 9vp%6[  
     MaskBits|=CTRLBIT; PyMVTP4  
     break; f>8B'%]  
    case VK_SHIFT: ;>Ca(Y2M  
     MaskBits|=SHIFTBIT; /iUUM t'  
     break; \POnsM)+l  
    default: //judge the key and send message \|~?x#aA  
     break; ^b"bRQqm  
   } 1O9p YW5J  
   for(int index=0;index<MAX_KEY;index++){ #$t}T@t>  
    if(hCallWnd[index]==NULL) !b7'>b'J<1  
     continue; k%l_N)38  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =F'M~3M   
    { Be{/2jU%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Cfr<D3&,]  
     bProcessed=TRUE; JEsLF{  
    } ;wbUk5Tf/  
   } \o B'  
  } "X5_-l  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 6)wy^a|pb  
   for(int index=0;index<MAX_KEY;index++){ *^D@l%av;  
    if(hCallWnd[index]==NULL) |}M0,AS  
     continue; %'"HGZn b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) <rB3[IJo  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); B`*f(  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 GOf`Z'\xt  
   } p?V ?nCv1O  
  } 9fNu?dE   
 } MyH[vE^b  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); G'O/JM  
} 5 o#<`_=J  
{Z#e{~m#  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: }Kj Ju;  
;P;"F21^>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); P{S\pWZkk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K$GRJ  
^qeY9O  
  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: (T|TEt  
i*S|qX7``  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) CGC-"A/W  
{ H|;*_  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 4mN].X[,  
 { X*!Dc,0.k  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 iiX\it$s  
  SaveBmp(); V uG?B{  
  return FALSE; :K~rvv\L7  
 } OJP5k/U$  
 …… //其它处理及默认处理 <b d1  
} gB>imr#e&  
sno`=+|U]  
pb^,Qvnp   
  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。 ]*N:;J  
V1SqX:;b&  
  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。 >ZT& `E  
Vi|7%!j<  
  二、编程步骤 y?pD(u  
M18qa,fK{  
  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"; +Edzjf~Tt  
/gz:zThf{  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; G'f9N^w  
<4bz/^  
  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; u8YB)kG  
<S1??  
  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; -<qxO  
)Hbb&F  
  5、 添加代码,编译运行程序。 {O^TurbTFA  
mn]-rTr  
三、程序代码 t;8\fIW5  
8Q2]*%  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL B.$PhmCG  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 5@P%iBA4(3  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ "h=6Q+Ze  
#if _MSC_VER > 1000 d^F|lc ]8  
#pragma once TE^7P0bh  
#endif // _MSC_VER > 1000 0"EoC  
#ifndef __AFXWIN_H__ :{LAVMG&^  
#error include 'stdafx.h' before including this file for PCH  fb\DiKsW  
#endif Ji;SY{~kv  
#include "resource.h" // main symbols ]3*P:$Rq  
class CHookApp : public CWinApp ha*X6R  
{ ~>V-*NT8  
 public: $<B +K  
  CHookApp(); 1O |V=K  
  // Overrides |G(1[RNu  
  // ClassWizard generated virtual function overrides 8-7dokg>  
  //{{AFX_VIRTUAL(CHookApp) zv //K_  
 public: qM %O  
  virtual BOOL InitInstance(); F4Zn5&.)  
  virtual int ExitInstance(); i+f7  
  //}}AFX_VIRTUAL b~7Jh:%@;  
  //{{AFX_MSG(CHookApp) 1Cm~X$S.  
  // NOTE - the ClassWizard will add and remove member functions here. s]U4B<q  
  // DO NOT EDIT what you see in these blocks of generated code ! AZ[75>  
  //}}AFX_MSG )kYOHS  
  DECLARE_MESSAGE_MAP() pb#mg^8  
}; ~eP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Nl@k*^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W wuZ(>|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W9Nmx3ve  
BOOL InitHotkey(); JqEW= 5  
BOOL UnInit(); u~W{RHClW  
#endif -G9|n#zCU  
G.g|jP'n  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. iq?l#}]  
#include "stdafx.h" eNRs&^  
#include "hook.h" !X|k"km"  
#include <windowsx.h> {<2>6 _z  
#ifdef _DEBUG hd B |#t  
#define new DEBUG_NEW #,L~w  
#undef THIS_FILE 7^$)VBQ/  
static char THIS_FILE[] = __FILE__; '0|o`qoLzA  
#endif "PMQyzl  
#define MAX_KEY 100 +t98 @  
#define CTRLBIT 0x04 DkgUvn/S  
#define ALTBIT 0x02 z8HsYf(!  
#define SHIFTBIT 0x01 9R p2W  
#pragma data_seg("shareddata") f1mHN7hxW  
HHOOK hHook =NULL; !VwmPAMr#v  
UINT nHookCount =0; y4@gGC=  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Yi(1^'Bi  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT brh=NAzt  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey -v+&pG?m  
static int KeyCount =0; `>6T&  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift o#>a 5  
#pragma data_seg() B**Nn!}0  
HINSTANCE hins; 5 L/x-i  
void VerifyWindow(); $5AC1g'  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 2j&v;dmh<  
//{{AFX_MSG_MAP(CHookApp) 8d!GZgC8R  
// NOTE - the ClassWizard will add and remove mapping macros here. !aPD}xCH#  
// DO NOT EDIT what you see in these blocks of generated code! o}8I_o&]U  
//}}AFX_MSG_MAP BkawL,  
END_MESSAGE_MAP() 3JO]f5  
}aF  
CHookApp::CHookApp() FJeiY#us  
{ lCJ6Ur;  
 // TODO: add construction code here, x)SralWb  
 // Place all significant initialization in InitInstance ?cKZ_c  
} Q&CElx?L  
IA4N@ijRxh  
CHookApp theApp; .2W"w)$nuq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 1l5J P|x  
{ d"E^SBO&  
 BOOL bProcessed=FALSE; 0*8TS7.3  
 if(HC_ACTION==nCode) C!+I>J{4f  
 { qmglb:"  
  if((lParam&0xc0000000)==0xc0000000){// Key up xCXQ<77  
   switch(wParam) Ooc\1lX  
   { tIc 7:th  
    case VK_MENU: PT'MNH  
     MaskBits&=~ALTBIT; >oGiIYq  
     break; O^Q ,-=tA\  
    case VK_CONTROL: |A\a4f 'G  
     MaskBits&=~CTRLBIT; "?3`  
     break; !E2W\chi  
    case VK_SHIFT: ` qUX.  
     MaskBits&=~SHIFTBIT; o.m:3!RW  
     break; B(_WZa!  
    default: //judge the key and send message F]EBD8/b  
     break; ;AX8aw,  
   } j+rG7z){K  
   for(int index=0;index<MAX_KEY;index++){ r^0F"9eOL  
    if(hCallWnd[index]==NULL) +1rkq\{l  
     continue; 7b[wu~'( n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5'KA'>@  
    { aUc|V{Jp  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); pTJX""C  
     bProcessed=TRUE; iEm ?  
    } E5</h"1  
   } M5g\s;y;  
  } Z hd#:d  
  else if((lParam&0xc000ffff)==1){ //Key down O hVs#^  
   switch(wParam) CrC =A=e  
   { GbI-SbE  
    case VK_MENU: H1/?+N}(  
     MaskBits|=ALTBIT; B07v^!Z>  
     break; "ZrOrdlg+A  
    case VK_CONTROL: zmI]cD@G  
     MaskBits|=CTRLBIT; *JX;|S  
     break; ICC%,$C~l  
    case VK_SHIFT: hI},~af  
     MaskBits|=SHIFTBIT; c!#:E`  
     break; 5T@aCC@$h  
    default: //judge the key and send message b[I8iSkfi  
     break; l(;Kij  
   } ]e'fa/I  
   for(int index=0;index<MAX_KEY;index++) JH8}Ru%Z  
   { l{Dct\ #s  
    if(hCallWnd[index]==NULL) jYRP8 Yi  
     continue; :9|\Z|S(I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _oG&OJ@  
    { bq>_qpr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); b2,!g }I  
     bProcessed=TRUE; g[H',)A)  
    } bD ^b  
   } ;G\8jP'   
  } as*4UT3  
  if(!bProcessed){ -=`#fDvBn  
   for(int index=0;index<MAX_KEY;index++){ Hnk:K9u.B:  
    if(hCallWnd[index]==NULL) "ZwKk G  
     continue; ,<-G<${  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) S35~Cp  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .8(OT./  
   } {vEOn-(7  
  } m_+sR!\H8  
 } UCW V2Mu  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); F+m }#p  
} Ep9W-n?}  
nKa$1RMO  
BOOL InitHotkey() 2*w0t:Yx e  
{ ]:>,A@7  
 if(hHook!=NULL){ i4JqT\q  
  nHookCount++; Fz#X= gmG  
  return TRUE; bKg8rK u  
 } 2i;7{7  
 else /!h;c$  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); VTy9_~q  
  if(hHook!=NULL) Xpe)PXb  
   nHookCount++; %D$]VSP;  
  return (hHook!=NULL); [AMAa]^  
} I$q]. B  
BOOL UnInit() vM:cWat  
{ a=cvCf  
 if(nHookCount>1){ BTgG4F/)  
  nHookCount--; jTO), v:w  
  return TRUE; b 5yW_Ozdh  
 } ;OqB5qd  
 BOOL unhooked = UnhookWindowsHookEx(hHook); W-NDBP:  
 if(unhooked==TRUE){ MZ+^-@X  
  nHookCount=0; ls@i".[  
  hHook=NULL; h8Yx#4  
 } 7 d LuX   
 return unhooked; ;AO#xv+#  
} IxLhU45  
q9Y9w(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^nbnbU4'  
{ iQDx{m3]  
 BOOL bAdded=FALSE; V"c 6Kdtd  
 for(int index=0;index<MAX_KEY;index++){ Z}$TKO*u  
  if(hCallWnd[index]==0){ )W/;=K  
   hCallWnd[index]=hWnd; cufH?Xg<  
   HotKey[index]=cKey; UMAgA!s  
   HotKeyMask[index]=cMask; Zm6{n '  
   bAdded=TRUE; zR2B- &]H  
   KeyCount++; Tg!m`9s+  
   break; ~e6Brq  
  } 1UPC e  
 } '>r7V  
 return bAdded; EoK~S\dS  
} '!/<P"5t  
0lhVqy}:}o  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) R(q~ -3~  
{ &=VDASEu  
 BOOL bRemoved=FALSE; ^R:cd8+?%  
 for(int index=0;index<MAX_KEY;index++){ "[y-+)WTG  
  if(hCallWnd[index]==hWnd){ g+J-Zg6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0u\GO;  
    hCallWnd[index]=NULL; y;s`P .  
    HotKey[index]=0; ~\J}Kqg  
    HotKeyMask[index]=0; tH-C8Qxy  
    bRemoved=TRUE; ,^uEYT}j  
    KeyCount--; RzWXKBI\E]  
    break; 0#nPbe,Lj  
   } YW7b)u Yf  
  } M5 <@~V/[  
 } @Y1s$,=xB  
 return bRemoved; EK4d_L]I  
} sBcPq SMby  
V4_=<W  
void VerifyWindow() P9T}S  
{ 17`1SGZ  
 for(int i=0;i<MAX_KEY;i++){ ~]QHk?[wc  
  if(hCallWnd!=NULL){ /5u<78GW1  
   if(!IsWindow(hCallWnd)){ 4O35 "1  
    hCallWnd=NULL; @nux9MX<9  
    HotKey=0; v%q0OX>9X"  
    HotKeyMask=0; <yd{tD$A*  
    KeyCount--; 3\XU_Xs(]  
   } *s:(jDlv  
  } r-Pkfy(  
 } H '  
} 3f,hw5R  
/pT =0=  
BOOL CHookApp::InitInstance() B]Thn  
{ *{L)dW+:  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ;C2K~8,  
 hins=AfxGetInstanceHandle(); U|IzXQX(  
 InitHotkey(); !O<)\ )|g  
 return CWinApp::InitInstance(); "g1)f"pL  
} k7T`bYv  
neLAEHV  
int CHookApp::ExitInstance() >U[j]V]  
{ %^ !,t:d  
 VerifyWindow(); Dy:|g1>  
 UnInit(); FY#C.mL  
 return CWinApp::ExitInstance(); 5yP\I+Fm  
} )v.=jup[  
MB]<Dyj,  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 8|\8O@  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Sy0$z39  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ AJF#Aw `o  
#if _MSC_VER > 1000 ++`0rY%  
#pragma once y ~U #veY  
#endif // _MSC_VER > 1000 :gWu9Y|{  
QC}CRkp  
class CCaptureDlg : public CDialog 8ap%?  
{ 5Ou`z5S\k  
 // Construction {+Rog/;S'  
 public: q1d}{DU  
  BOOL bTray; Yp^rR }N  
  BOOL bRegistered; +[\FD; >  
  BOOL RegisterHotkey(); ?fi,ifp*|l  
  UCHAR cKey; ]QlwR'&j/n  
  UCHAR cMask; huh6t !  
  void DeleteIcon(); b?tB(if!I  
  void AddIcon(); j}.\]$J  
  UINT nCount; CDK 5  
  void SaveBmp(); !xo{-@@wS  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor fof TP1  
  // Dialog Data d,B:kE0Y  
  //{{AFX_DATA(CCaptureDlg) sN9&,&W1  
  enum { IDD = IDD_CAPTURE_DIALOG }; BHU6t<G  
  CComboBox m_Key; l~w2B>i)  
  BOOL m_bControl; U@uGNMKR  
  BOOL m_bAlt; w"Gm;B4  
  BOOL m_bShift; of%Ktm5Qi  
  CString m_Path; @1o/0y"  
  CString m_Number; q_MG?re  
  //}}AFX_DATA __G?0*3G  
  // ClassWizard generated virtual function overrides &m)6J'q3k  
  //{{AFX_VIRTUAL(CCaptureDlg) pZqq]mHK  
 public:  KY$)#i  
  virtual BOOL PreTranslateMessage(MSG* pMsg); #P0&ewy  
 protected: Whm,F^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ) l:[^$=,  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); iJ1"at  
  //}}AFX_VIRTUAL 3TeY%5iVt  
  // Implementation vqDu(6!2  
 protected: su{poQ}K  
  HICON m_hIcon; P3+5?.p.  
  // Generated message map functions 4%>$-($  
  //{{AFX_MSG(CCaptureDlg) s(/; U2"e  
  virtual BOOL OnInitDialog(); ^/I 7|u]  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); < $lCkSx<Q  
  afx_msg void OnPaint(); YNKHN2E8  
  afx_msg HCURSOR OnQueryDragIcon(); chM%]|gey  
  virtual void OnCancel(); &^}1O:8e  
  afx_msg void OnAbout(); ib#KpEk  
  afx_msg void OnBrowse(); =Y|VgV  
  afx_msg void OnChange(); r1 !@hT  
 //}}AFX_MSG `yrB->|vG  
 DECLARE_MESSAGE_MAP() xr4 *{v  
}; 8lvV4yb  
#endif g+vva"  
RO+GK`J  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Lo{ E:5q  
#include "stdafx.h" G|!Tj X7s  
#include "Capture.h" |"ls\ 7  
#include "CaptureDlg.h" Yvw(t j5_5  
#include <windowsx.h> ayR-\mZ  
#pragma comment(lib,"hook.lib") &^ 1$^=  
#ifdef _DEBUG +" .X )avF  
#define new DEBUG_NEW !Xf5e*1IS  
#undef THIS_FILE `u3EU*~W  
static char THIS_FILE[] = __FILE__; BC&S>#\  
#endif N{9v1`B  
#define IDM_SHELL WM_USER+1 gc_:%ki  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); il4^zj82  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !/'t5~x[  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; <J< {l  
class CAboutDlg : public CDialog _S<3\%(0  
{ *+Ek0M  
 public: ,w<S|#W~+  
  CAboutDlg(); md)c0Bg8~  
  // Dialog Data % ?0:vn  
  //{{AFX_DATA(CAboutDlg) %9KldcQ}~  
  enum { IDD = IDD_ABOUTBOX }; N7b8m?!  
  //}}AFX_DATA Ns>- o  
  // ClassWizard generated virtual function overrides +~m46eI  
  //{{AFX_VIRTUAL(CAboutDlg) N)uSG&S:  
 protected: 6Zm# bFQ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support q;T{|5/O  
  //}}AFX_VIRTUAL x9UX!Z5*>  
  // Implementation L iN$ pwm  
 protected: 'f!8DGix  
  //{{AFX_MSG(CAboutDlg) Kr gFKRgGj  
  //}}AFX_MSG hZ?Rof  
  DECLARE_MESSAGE_MAP() e24WW^S  
}; 6M @[B|Q(  
n4;.W#\  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) }aa'\8  
{ ,>bh$|  
 //{{AFX_DATA_INIT(CAboutDlg) SA&Rep^  
 //}}AFX_DATA_INIT W,V:R  
} -; s|  
xI#9  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Qp)v?k ]  
{ Vz~{UHH6  
 CDialog::DoDataExchange(pDX); ?8npG]L)  
 //{{AFX_DATA_MAP(CAboutDlg) tU}h~&M  
 //}}AFX_DATA_MAP 2Q/x@aT,h  
} 2e+UM$  
SE@LYeC}dE  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) &47i"%  
 //{{AFX_MSG_MAP(CAboutDlg) /?uPEKr  
 // No message handlers 1F5XvQl  
 //}}AFX_MSG_MAP =)0,#9k U]  
END_MESSAGE_MAP() }NHaCG[,  
5;tD"/nz  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) s 1 A.+  
: CDialog(CCaptureDlg::IDD, pParent) N({MPO9  
{ fx41,0;gZq  
 //{{AFX_DATA_INIT(CCaptureDlg) b z`+k,*  
  m_bControl = FALSE; B nFwlw  
  m_bAlt = FALSE; 1{)5<!9!l  
  m_bShift = FALSE; <Th6r.#?  
  m_Path = _T("c:\\"); yZ0-wI  
  m_Number = _T("0 picture captured."); g!g#]9j  
  nCount=0; jD$,.AVvz  
  bRegistered=FALSE; "@e3EX7h  
  bTray=FALSE; =_.l8IYX$%  
 //}}AFX_DATA_INIT dN$0OS`s[  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 e>} s;H,  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); j+i\bks  
} G,&<<2{(f;  
7-bd9uVK  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) F&!6jv  
{ B~1 _28\  
 CDialog::DoDataExchange(pDX); H4WP~(__  
 //{{AFX_DATA_MAP(CCaptureDlg) Q:2>}QgX}  
  DDX_Control(pDX, IDC_KEY, m_Key); U$O\f18  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); m ifxiV  
  DDX_Check(pDX, IDC_ALT, m_bAlt); \r/rBa\  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ? ^0:3$La  
  DDX_Text(pDX, IDC_PATH, m_Path); Z)I+@2  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 29;?I3< *  
 //}}AFX_DATA_MAP G?L HmTHg  
} q$0*b]=E  
Mo|;'+  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) k0OYJ/  
//{{AFX_MSG_MAP(CCaptureDlg) Y+kfBvxyf  
 ON_WM_SYSCOMMAND() -$pzl,^ h  
 ON_WM_PAINT() }n]Ng]KM`  
 ON_WM_QUERYDRAGICON() ;,hwZZA  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) iw3FA4{(  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >nJ\BPx  
 ON_BN_CLICKED(ID_CHANGE, OnChange) F~,Mw8  
//}}AFX_MSG_MAP &Qf/>@ l}  
END_MESSAGE_MAP() A=$04<nP8!  
cXA i k-  
BOOL CCaptureDlg::OnInitDialog() Eq%}  
{ \{Y 7FC~  
 CDialog::OnInitDialog(); ;"a=gr  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); AFq~QXmr)  
 ASSERT(IDM_ABOUTBOX < 0xF000); M1k{t%M+S  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Kr?TxhUHd  
 if (pSysMenu != NULL) 5#HW2"7  
 { iowTLq!?  
  CString strAboutMenu; Gj1&tjK  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 0\X\izQ5  
  if (!strAboutMenu.IsEmpty()) d6Ht2  
  { "|x^|n8i  
   pSysMenu->AppendMenu(MF_SEPARATOR); %v=*Wb\3|  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); =ElO?9&  
  } Y4J3-wK5  
 } j_qbAP  
 SetIcon(m_hIcon, TRUE); // Set big icon 4V{:uuI;f  
 SetIcon(m_hIcon, FALSE); // Set small icon >@U*~Nz  
 m_Key.SetCurSel(0); ] ]u s %  
 RegisterHotkey(); 1auIR/=-  
 CMenu* pMenu=GetSystemMenu(FALSE); n4O]8C'lW9  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 35h 8O,Y  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); bHY=x}Hv  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); }fp-pe69z  
 return TRUE; // return TRUE unless you set the focus to a control (o 5s"b  
} EuEZ D +  
BOX{]EOj  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) T(#J_Y  
{ R}-(cc%5  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 4zXFuTr($  
 { aHV;N#Lx3  
  CAboutDlg dlgAbout; G0CW}e@)  
  dlgAbout.DoModal(); +>8'mf  
 } C/q'=:H;  
 else 0.\/\V:H6  
 { 1jx:;j  
  CDialog::OnSysCommand(nID, lParam); S.mG?zbw  
 } {AhthR%(1  
}  U'k*_g  
6]&OrS[  
void CCaptureDlg::OnPaint() .6ylZ  
{ evya7^,F  
 if (IsIconic()) 3$jT*OyG#  
 { nXaC 3W:"  
  CPaintDC dc(this); // device context for painting h&M{]E9=  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); h}>"j%I  
  // Center icon in client rectangle Z&G+bdA>,  
  int cxIcon = GetSystemMetrics(SM_CXICON); |hKDvH  
  int cyIcon = GetSystemMetrics(SM_CYICON); 7!$Q;A  
  CRect rect; WQx?[tW(U  
  GetClientRect(&rect); TtK[nP  
  int x = (rect.Width() - cxIcon + 1) / 2; )Oq|amvC  
  int y = (rect.Height() - cyIcon + 1) / 2; 7LfAaj  
  // Draw the icon ;@0;pY  
  dc.DrawIcon(x, y, m_hIcon); `Syl:rU~y@  
 } 46}g7skD  
 else .O DU  
 { y;4OY  
  CDialog::OnPaint(); 4(#'_jS  
 } 1NbG>E#Ol  
} R6 y#S&]x  
^+*N%yr  
HCURSOR CCaptureDlg::OnQueryDragIcon() 5 )A1\  
{ *1ilkmL%  
 return (HCURSOR) m_hIcon; >,v`EIg  
} eln)BW#  
HSw;^E)1  
void CCaptureDlg::OnCancel() 2% MC Yn  
{ im${3>26  
 if(bTray) YC*"Thuu  
  DeleteIcon(); l z/8  
  CDialog::OnCancel(); =h-U  
} t0( A4E  
ZAW^/bo<  
void CCaptureDlg::OnAbout() 9# 23FK  
{ Yc`o5Q\>  
 CAboutDlg dlg; Fh)IgzFj  
 dlg.DoModal(); L\37xJo  
} ^gN6/>]qrY  
@T@< _ ?)  
void CCaptureDlg::OnBrowse() oro$wFxJO  
{ [NF'oRRD9s  
 CString str; ^dI424  
 BROWSEINFO bi; kPKB|kP\  
 char name[MAX_PATH]; ! :Y:pu0  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); *Hg>[@dP0  
 bi.hwndOwner=GetSafeHwnd(); 7dN*lks  
 bi.pszDisplayName=name; S:u:z=:r  
 bi.lpszTitle="Select folder"; }V'} E\\  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 2pZXZ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); R &n Pj~  
 if(idl==NULL) DKH-Q(M56  
  return; H!@kO]?n  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ww)<E`eGi  
 str.ReleaseBuffer(); -r!. 9q  
 m_Path=str; dydc}n  
 if(str.GetAt(str.GetLength()-1)!='\\') .fn \]rUv  
  m_Path+="\\"; !({}(!P .  
 UpdateData(FALSE); a`wc\T^  
} FW;m\vu  
, |0}<%  
void CCaptureDlg::SaveBmp() .14~J6  
{ #F:p-nOq  
 CDC dc; 2kqup)82e  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); q'+)t7!  
 CBitmap bm; 7( #:GD  
 int Width=GetSystemMetrics(SM_CXSCREEN); \0A3]l  
 int Height=GetSystemMetrics(SM_CYSCREEN); hl;u'_AB  
 bm.CreateCompatibleBitmap(&dc,Width,Height); seba9 y  
 CDC tdc; CYt?,qk-r  
 tdc.CreateCompatibleDC(&dc); M "ui0 ac  
 CBitmap*pOld=tdc.SelectObject(&bm); 3t.l5m Rg5  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Z3%}ajPu[  
 tdc.SelectObject(pOld); 0q^>ZF-@  
 BITMAP btm; x!hh"x  
 bm.GetBitmap(&btm); _PPy44r2  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 2"COP>  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); MO[2~`,Q!  
 BITMAPINFOHEADER bih; T!uM+6|Y  
 bih.biBitCount=btm.bmBitsPixel; QER?i;-wb  
 bih.biClrImportant=0; H h4WMZJG  
 bih.biClrUsed=0; \h+AXs<j  
 bih.biCompression=0; JX<)EZ!F  
 bih.biHeight=btm.bmHeight; &g#@3e1>  
 bih.biPlanes=1; }?lrU.@zg  
 bih.biSize=sizeof(BITMAPINFOHEADER); sm9k/(-  
 bih.biSizeImage=size; _qU4Fadgm  
 bih.biWidth=btm.bmWidth; C=-=_>Q,L<  
 bih.biXPelsPerMeter=0; SP@ >vl+;  
 bih.biYPelsPerMeter=0; pD(j'[  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Fzm*Pz3  
 static int filecount=0; FOb0uj=(v  
 CString name; c7?_46 J  
 name.Format("pict%04d.bmp",filecount++); O8^A5,2@3>  
 name=m_Path+name; ,yC-+VL  
 BITMAPFILEHEADER bfh; #OZ>V3k  
 bfh.bfReserved1=bfh.bfReserved2=0; CZ8KEBl  
 bfh.bfType=((WORD)('M'<< 8)|'B'); \TIT:1  
 bfh.bfSize=54+size; ]{!U@b  
 bfh.bfOffBits=54; eFipIn)b  
 CFile bf; '|ad_M  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ y~(h>gi,x  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ?llXd4  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); i|c'Lbre`  
  bf.WriteHuge(lpData,size); U1Q:= yD  
  bf.Close(); Y y5h"r  
  nCount++; }~2LW" 1'  
 } \1d (9jR  
 GlobalFreePtr(lpData); ~W*FCG#E  
 if(nCount==1) =pr` '  
  m_Number.Format("%d picture captured.",nCount); Q[Z8ok  
 else }I2wjO  
  m_Number.Format("%d pictures captured.",nCount); T _r:4JS  
  UpdateData(FALSE); ?yZ+D z\  
} 1}S S+>`  
toLV4BtIG  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) #||}R[~P"  
{ `CBZhI%%  
 if(pMsg -> message == WM_KEYDOWN) "/yC@VC>  
 { !1rlN8w(qr  
  if(pMsg -> wParam == VK_ESCAPE) ,k.3|aZE  
   return TRUE; B{/R: Hm  
  if(pMsg -> wParam == VK_RETURN) 8Pfb~&X^Ws  
   return TRUE; Y5f1lUT  
 } 2iHUZzz\  
 return CDialog::PreTranslateMessage(pMsg); !NIhx109q  
} @X%C>iYa9  
fJ5iS  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) i3dkYevs?  
{ <qtr   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Q`~jw>x  
  SaveBmp(); ^pxX]G]  
  return FALSE; 7X`l&7IXP  
} bW$,?8(  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ u6?Q3 bvI  
 CMenu pop; XYjV.j\  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); H  >j  
 CMenu*pMenu=pop.GetSubMenu(0); +j#+8Ze  
 pMenu->SetDefaultItem(ID_EXITICON); u&^b~# T  
 CPoint pt; UG'Q]S#!  
 GetCursorPos(&pt); i% w3/m  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 8k2?}/+  
 if(id==ID_EXITICON) 5:\},n+VE  
  DeleteIcon(); 67VL@ ]  
 else if(id==ID_EXIT) # Nk;4:[  
  OnCancel(); >l]Xz*HE  
 return FALSE; \jh'9\  
} ?TM ,Q  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); %!]@J[*1  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) wHzEMwY_  
 AddIcon(); 3("_Z%  
 return res; f6EZ( v  
} \"qY"V  
Olt `:;j-  
void CCaptureDlg::AddIcon() ) dn(G@5  
{ T m,b,hi$  
 NOTIFYICONDATA data; oin$-i|Xp!  
 data.cbSize=sizeof(NOTIFYICONDATA); <x@}01 ~  
 CString tip; *e<[SZzYZ  
 tip.LoadString(IDS_ICONTIP); ,f<?;z  
 data.hIcon=GetIcon(0); -5 RD)(d  
 data.hWnd=GetSafeHwnd(); ccNd'2P  
 strcpy(data.szTip,tip); |)nZ^Cc  
 data.uCallbackMessage=IDM_SHELL; +?F[/?s5qz  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; -1 FPkp  
 data.uID=98; L E&RY[  
 Shell_NotifyIcon(NIM_ADD,&data); W_||6LbZy  
 ShowWindow(SW_HIDE); 4^:\0U F  
 bTray=TRUE; 4Z1ST;  
} :X0k]p  
%WSo b@f8  
void CCaptureDlg::DeleteIcon() s&A} h  
{ mi ik%7>W  
 NOTIFYICONDATA data; @"hb) 8ng  
 data.cbSize=sizeof(NOTIFYICONDATA); nePfu G]Q  
 data.hWnd=GetSafeHwnd(); 5*E]ETo@R  
 data.uID=98; kEJj=wx  
 Shell_NotifyIcon(NIM_DELETE,&data); .GV;+8HzS  
 ShowWindow(SW_SHOW); zepm!JR1  
 SetForegroundWindow(); S-P/+K6  
 ShowWindow(SW_SHOWNORMAL); e_#._Pi  
 bTray=FALSE; 8hXl%{6d3  
} ?u-|>N>  
PbW(%7o(t  
void CCaptureDlg::OnChange() =V-A@_^!c  
{ a,xycX:U  
 RegisterHotkey(); uH/J]zKR  
} Z&#('Z  
,3?Q(=j  
BOOL CCaptureDlg::RegisterHotkey() S\4tzz @  
{ B&\IGWG(  
 UpdateData(); Z LB4m`  
 UCHAR mask=0; OPwtV9%  
 UCHAR key=0; .}^g!jm~h  
 if(m_bControl) ao%NK<Lt  
  mask|=4; 8?J&`e/  
 if(m_bAlt) ZU85P0  
  mask|=2; V}bjK8$$  
 if(m_bShift) 4\y/'`xm)6  
  mask|=1; 2w59^"<,  
  key=Key_Table[m_Key.GetCurSel()]; mlixIW2  
 if(bRegistered){ E7NV ^4h  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); }0eF~>Df  
  bRegistered=FALSE; y6LWx:  
 } lH-/L(h2  
 cMask=mask; Z9:-rcr  
 cKey=key; ?$vCW|f  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); [ OM7g'?S0  
 return bRegistered; o1Ph~|s*8  
} e]`[yf  
G.rrv  
  四、小结 K17j$o^6KK  
, 0imiv  
  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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