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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: U> s$}Y:+Z  
  298@&_  
  一、实现方法 Zqnwf  
MUfhk)"  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: O5eTkKUc  
q2C._{ 0'  
#pragma data_seg("shareddata") w `0m[*  
HHOOK hHook =NULL; //钩子句柄 kL1StF#p  
UINT nHookCount =0; //挂接的程序数目 ^yo~C3 r~  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 w`$M}oX(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1  F6\Hqv  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey z nxAP|  
static int KeyCount =0; ,_(AiQK  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Lradyo44u\  
#pragma data_seg() M'D l_dx-  
)IH|S5mG?  
  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。 O.% $oV  
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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: NP#:} )  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR P@wuk1  
cKey,UCHAR cMask) Lm{qFu  
{ A3 |hFk  
 BOOL bAdded=FALSE; R@8pKCL.  
 for(int index=0;index<MAX_KEY;index++){ GZwz4=`  
  if(hCallWnd[index]==0){ EDf"1b{PX  
   hCallWnd[index]=hWnd; 88l\8k4r  
   HotKey[index]=cKey; Adma~]T9  
   HotKeyMask[index]=cMask; Z=&cBv4Fs  
   bAdded=TRUE; k:qS'  
   KeyCount++; `, lry7]  
   break; DQy<!Wb+  
  } ~]_U!r[FA  
 } # zbAA<f  
 return bAdded; Ap<kK0#h  
} ZZu{c t9  
//删除热键 :+q d>;yf#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7H l>UX,|  
{ -$2a@K,i  
 BOOL bRemoved=FALSE; U7do,jCoa  
 for(int index=0;index<MAX_KEY;index++){ hRwj-N%C  
  if(hCallWnd[index]==hWnd){ MoX~ZewWR  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -+ha4JOB  
    hCallWnd[index]=NULL; ,ut-Di=6  
    HotKey[index]=0; CVt:tV  
    HotKeyMask[index]=0;  nLD1j  
    bRemoved=TRUE; z *FCd6X  
    KeyCount--; aJ/}ID  
    break; =} D9sT  
   } R ~ZcTY[8  
  } ("r\3Mvs  
 }  .V   
 return bRemoved; 3HEm-pok  
} )p^" J|  
?bH&F  
!Soz??~o/  
  DLL中的钩子函数如下: Q_r}cL/A  
H _0F:e  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) VchI0KL?  
{ 4Y5lP00!}  
 BOOL bProcessed=FALSE; |8q:sr_  
 if(HC_ACTION==nCode) ! *eDT4a  
 { Oo0SDWI`(  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 !7hjA=0  
   switch(wParam) 4'wbtE|  
   {  e=^^TX`I  
    case VK_MENU: 2Wn*J[5  
     MaskBits&=~ALTBIT; T@%\?=P  
     break; NHL9qL"qk  
    case VK_CONTROL: @u @~gEt  
     MaskBits&=~CTRLBIT; MO>9A,&f  
     break; 9$?Sts}6&  
    case VK_SHIFT: D 0 O^=v|  
     MaskBits&=~SHIFTBIT; Fd86P.Df  
     break; ]?6Pt:N2  
    default: //judge the key and send message cE;n>ta"F  
     break; 'L@kZ  
   } DYDeb i6  
   for(int index=0;index<MAX_KEY;index++){ F1)5"7f  
    if(hCallWnd[index]==NULL) 2Onp{,'}  
     continue; :o 8XG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f OasX!=  
    { IE|? &O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2O 2HmL  
     bProcessed=TRUE; 21$E.x 6  
    } nSv@FT'~z  
   } D"V(A\sZ  
  } 7tbY>U8  
  else if((lParam&0xc000ffff)==1){ //有键按下 vc0LV'lmg  
   switch(wParam) uc>":V  
   { jNvDE}'  
    case VK_MENU: w *M&@+3I  
     MaskBits|=ALTBIT; oo\7\b#Jx  
     break; $<QrV,T  
    case VK_CONTROL: d%za6=M  
     MaskBits|=CTRLBIT; bFIM07  
     break; 9 {wRqY  
    case VK_SHIFT: Fq$r>tmV  
     MaskBits|=SHIFTBIT; GEK7q<  
     break; z"97AXu  
    default: //judge the key and send message n_4 r'w  
     break; 7 x'2  
   } uOO\!Hqq  
   for(int index=0;index<MAX_KEY;index++){ DL*vF>v  
    if(hCallWnd[index]==NULL) #CV]S4/^  
     continue; r~z'QG6v/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) iInWw"VbKe  
    { Wc Gg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4{@{VsXN  
     bProcessed=TRUE; BsU}HuQZQ  
    } ,v<7O_A/e  
   } njc-=o  
  } RR+{uSO,t  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 B[k=6EU8k  
   for(int index=0;index<MAX_KEY;index++){ ,$} xPC  
    if(hCallWnd[index]==NULL) uGv|!UQw  
     continue; {Q}F.0Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) L>h|1ZK  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); N;`/>R4|I  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 g/FZ?Wo  
   } kH5D%`Kw  
  } 31~nay15  
 } :h(` eC  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )q66^% ;S  
} 35Yf,@VO  
nwp(% fBo  
  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: o_1N "o%  
kO5lLqE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); P(3k1SM  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); r'`7}@H*  
MkL)  
  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: ZfH +Iqd  
ua)jGif  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) m"T}em#   
{ !E_Zh*lgm  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 9QaE)wt  
 { ?ac4GA(  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Vr|e(e.%  
  SaveBmp(); u&w})`+u5  
  return FALSE; "M, 1ElQ  
 } $~S~pvT  
 …… //其它处理及默认处理 ~nTj't2R  
} f4 qVUU  
0-uw3U<  
XZ . T%g  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 _6Y+E"@zs  
lXg5UrW  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 tYXE$ i  
{l)$9!  
  二、编程步骤 EJ>&\Iq  
fZezDm(Q  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 6Cz O ztn  
qVKdc*R-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; o K>(yC[  
CxTmW5l  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; oNtoqYwH  
fd4C8>*7G  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; #1/~eIEY  
F#>00b{Q  
  5、 添加代码,编译运行程序。 {vGJ}q?Sd"  
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三、程序代码 a%e`  
hbOXR.0z  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Z4EmRa30 p  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) &iInru3  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ D8<C7  
#if _MSC_VER > 1000 37$ ^ie)  
#pragma once A*eVz]i,k&  
#endif // _MSC_VER > 1000 *I)J%#  
#ifndef __AFXWIN_H__ uN:KivVe  
#error include 'stdafx.h' before including this file for PCH HeO:=OE~>  
#endif  kDE-GX"Y  
#include "resource.h" // main symbols ~\mh\a&  
class CHookApp : public CWinApp i1|>JM[V  
{ .G8>UXX  
 public: K J\kR  
  CHookApp(); 6q\*{_CPB  
  // Overrides 8f/KNh7#s  
  // ClassWizard generated virtual function overrides z 7ik/>d?  
  //{{AFX_VIRTUAL(CHookApp) _Z Sp$>)/  
 public: 4/Y?eUQ  
  virtual BOOL InitInstance(); a8f#q]TyQ  
  virtual int ExitInstance(); X3\PVsH$K  
  //}}AFX_VIRTUAL "~5cz0 H3v  
  //{{AFX_MSG(CHookApp) F)(^c  
  // NOTE - the ClassWizard will add and remove member functions here. H; NV?CD  
  // DO NOT EDIT what you see in these blocks of generated code ! R7/S SuG6\  
  //}}AFX_MSG b!P,+!<  
  DECLARE_MESSAGE_MAP() a(|6)w-  
}; @^<odmM  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); )"S%'myj  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z-Uu/GjB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K9lekevB  
BOOL InitHotkey(); N#K)Z5J)b  
BOOL UnInit(); ?1D!%jfi  
#endif -;7xUNQ  
(T_-`N|  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ^o{{kju  
#include "stdafx.h" z.Ic?Wz7  
#include "hook.h" AP=h*1udk  
#include <windowsx.h> n.&7lg^X  
#ifdef _DEBUG W;Y^(f  
#define new DEBUG_NEW pM?~AYWb  
#undef THIS_FILE d ItfR'$  
static char THIS_FILE[] = __FILE__; E{<#h9=>  
#endif KClkPL!jP  
#define MAX_KEY 100 UZI:st   
#define CTRLBIT 0x04 sfyLG3$/  
#define ALTBIT 0x02 fAgeF$9@  
#define SHIFTBIT 0x01 ?> }p'{I  
#pragma data_seg("shareddata") f6%k;R.Wz  
HHOOK hHook =NULL; Hu"$ )V  
UINT nHookCount =0; w$:\!FImx  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey hzsQK _;S  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ENZym  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey QN#"c  
static int KeyCount =0; l8FJ\5'M  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift .; F<X \_  
#pragma data_seg() h mRmU{(Y  
HINSTANCE hins; "E\vdhk  
void VerifyWindow(); ga;nM#/  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) i1cd9  
//{{AFX_MSG_MAP(CHookApp) nQ\`]_C  
// NOTE - the ClassWizard will add and remove mapping macros here. ubM1Qr  
// DO NOT EDIT what you see in these blocks of generated code! Kk8wlC  
//}}AFX_MSG_MAP k24I1DlR8  
END_MESSAGE_MAP() 9^XZ|`  
,`bW (V  
CHookApp::CHookApp() ~JT`q: l-q  
{ #yochxF_  
 // TODO: add construction code here, @P7'MiP]K  
 // Place all significant initialization in InitInstance gD9CA*  
}  Zi~.  
0`x>p6.)G  
CHookApp theApp; TRi'l#m4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) dHDtY$/_  
{ :qdyC sn2  
 BOOL bProcessed=FALSE; .b,\.0N  
 if(HC_ACTION==nCode) $`|h F[tv  
 { e3ZRL91c  
  if((lParam&0xc0000000)==0xc0000000){// Key up \6wltTW]#  
   switch(wParam) ';3>rv_  
   { LO_Xr j  
    case VK_MENU: =3035{\  
     MaskBits&=~ALTBIT; M7/5e3  
     break; ,7B7X)m{3  
    case VK_CONTROL: zIF1A*UH  
     MaskBits&=~CTRLBIT; GJB+] b-  
     break; }!iopu  
    case VK_SHIFT: S%\5"uGa  
     MaskBits&=~SHIFTBIT; ! v![K  
     break; PB^rniYh  
    default: //judge the key and send message E{Wn&?i>A  
     break; BbX$R`f  
   } uU)t_W&-J  
   for(int index=0;index<MAX_KEY;index++){ ~T@E")uR  
    if(hCallWnd[index]==NULL) JPDxzp  
     continue; NOTG|\{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D9g*+KM&  
    { u0wu\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); cIO/8D#zU  
     bProcessed=TRUE; ;-1KPDIp`  
    } 16Qu{K  
   }  c k;:84  
  } Zna6-0o  
  else if((lParam&0xc000ffff)==1){ //Key down #X)DFAtb  
   switch(wParam) &3iI\s[  
   { U9]&KNx  
    case VK_MENU: eYv^cbO@:  
     MaskBits|=ALTBIT; '{,JuX"n  
     break; H2],auBY  
    case VK_CONTROL: `m'RvUc  
     MaskBits|=CTRLBIT; mCnl@  
     break; .B^ tEBGVD  
    case VK_SHIFT: ]4O!q}@Cd  
     MaskBits|=SHIFTBIT; 3SY1>}(Y  
     break; {%wrx'<  
    default: //judge the key and send message #`@)lU+/  
     break; 0Y0z7A:  
   } IYe[IHny1  
   for(int index=0;index<MAX_KEY;index++) &DQ_qOKD  
   { s3Bo'hGxG  
    if(hCallWnd[index]==NULL) hzAuj0-A  
     continue; @w33u^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f:8!@,I  
    { /\fR6|tJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); sB0]lj-[Un  
     bProcessed=TRUE; fbI5!i#lz  
    } iw.F8[})  
   } "U9e)a0v  
  } ~e|E5[-i  
  if(!bProcessed){ <YCjo[(~  
   for(int index=0;index<MAX_KEY;index++){ GB+$ed5@<  
    if(hCallWnd[index]==NULL) 7IUJHc?  
     continue; [?6+ r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) G9S3r3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *[>{ 9V  
   } ~&,S xQT  
  } m!INbIh  
 } h9d*N9!;M  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Urw =a$  
} #+i5'p(4  
MNh:NFCRA  
BOOL InitHotkey() {%2p(5FB  
{ 5bZ0}^FYF  
 if(hHook!=NULL){ JiqhCt\  
  nHookCount++; rxx VLW  
  return TRUE; Eb,M+c?  
 } W G3 _(mM  
 else ^!m%:r7Dr  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 2n"-~'3\  
  if(hHook!=NULL) MHE/#G  
   nHookCount++; pw))9~XU  
  return (hHook!=NULL); {_>XsB  
} f !7fz~&Sh  
BOOL UnInit() 7iy2V;}  
{ G_WFg$7G%  
 if(nHookCount>1){ ;Gp9 ?0  
  nHookCount--; KsTE)@ F:  
  return TRUE; f. h3:_r  
 } "MPS&OK  
 BOOL unhooked = UnhookWindowsHookEx(hHook); U+-;(Fh~  
 if(unhooked==TRUE){ a U<+ `  
  nHookCount=0; P(\x. d:  
  hHook=NULL; A{3nz DLI  
 } =q[+ e(,3  
 return unhooked; <UIE-#  
} %U[H`E  
,=pn}\ R  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5HB*  
{ \R 3O39[  
 BOOL bAdded=FALSE; !(S.7#-r  
 for(int index=0;index<MAX_KEY;index++){ +Lr`-</VF  
  if(hCallWnd[index]==0){ WK#c* rsij  
   hCallWnd[index]=hWnd; @]]\r.DG  
   HotKey[index]=cKey; "-HWw?rx/  
   HotKeyMask[index]=cMask; Cpn!}!Gnf  
   bAdded=TRUE; &`'@}o>2  
   KeyCount++; Yi`DRkp]3  
   break; dM -<aq  
  } *aYuuRx  
 } 3z k},8fu  
 return bAdded; *mw *z|-^V  
} $F/xv&t  
7$Cv=8  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) gd0a,_`M  
{ *]Eyf")  
 BOOL bRemoved=FALSE; )ItW}1[I  
 for(int index=0;index<MAX_KEY;index++){ !Ks<%; rb  
  if(hCallWnd[index]==hWnd){ Vc8w[oS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ U*BI/wZ  
    hCallWnd[index]=NULL; eV9,G8  
    HotKey[index]=0; 5IRUG)Icr  
    HotKeyMask[index]=0; w,1*dn  
    bRemoved=TRUE; R$2\Xl@qQF  
    KeyCount--; K:$GmV9o  
    break; ) '/xNR  
   } E,/nK  
  } u&j_;Y!6  
 } $b )k  
 return bRemoved; ] $F%  
} uOx"oR|  
BWkTQd<t  
void VerifyWindow() z|<?=c2P  
{ ^_=bssaOd  
 for(int i=0;i<MAX_KEY;i++){ b:x~Jz#%2  
  if(hCallWnd!=NULL){ Rf!$n7& \  
   if(!IsWindow(hCallWnd)){ mW3 IR3 b  
    hCallWnd=NULL; =)! ~t/  
    HotKey=0; !^aJS'aq  
    HotKeyMask=0; cmp@Ow"c  
    KeyCount--; ,C^u8Z|T  
   } Z>.('  
  } g T0@pxl  
 } b~!Q3o'W  
} @ n$/2y_.  
2t3)$\ylQp  
BOOL CHookApp::InitInstance() AD7&-=p&w  
{ 0>3Sn\gZ(  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Xz'o<S  
 hins=AfxGetInstanceHandle(); p-6T,')  
 InitHotkey(); G[zVGqk  
 return CWinApp::InitInstance(); G4EuW *~  
} A ? [Wfq|  
MwD8a<2Dg  
int CHookApp::ExitInstance() LKM;T-  
{ >B$B|g~  
 VerifyWindow(); MVDy|i4  
 UnInit(); X(;W Y^i!  
 return CWinApp::ExitInstance(); <@>l9_=R  
} }4q1"iMlO  
N3\vd_D(  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file B*}:YV  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 2GRv%:rZ  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ v+DXs!O{  
#if _MSC_VER > 1000 /!pJ"@  
#pragma once N LSJ D  
#endif // _MSC_VER > 1000 x.q"FXu  
&iaS3x  
class CCaptureDlg : public CDialog Pu,2a+0N  
{ @h%Nn)QBq  
 // Construction dTQW/kAHQ  
 public: To,*H OP  
  BOOL bTray; -T>i5'2)  
  BOOL bRegistered; +6(\7?  
  BOOL RegisterHotkey(); w u0q.]  
  UCHAR cKey; eI/5foA  
  UCHAR cMask; Z)<lPg!YAR  
  void DeleteIcon(); lB   
  void AddIcon(); *~`BG5w  
  UINT nCount; x-~=@oiv  
  void SaveBmp(); Am"&ApK  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 5wC,:c[H7  
  // Dialog Data }`+9ie7]/  
  //{{AFX_DATA(CCaptureDlg) mTLJajE/  
  enum { IDD = IDD_CAPTURE_DIALOG }; ur[^/lxx0  
  CComboBox m_Key; Yzw[.(jc}  
  BOOL m_bControl; m{r#o?  
  BOOL m_bAlt; yV*4|EkvW  
  BOOL m_bShift; #g<6ISuf  
  CString m_Path; _Sl3)  
  CString m_Number; b8glZb*$  
  //}}AFX_DATA [gj>ey8T  
  // ClassWizard generated virtual function overrides }d%Fl}.Ez  
  //{{AFX_VIRTUAL(CCaptureDlg) }ldpudU  
 public: iWIq~t*,H]  
  virtual BOOL PreTranslateMessage(MSG* pMsg); z#2n+hwE  
 protected: $CZ'[`+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #@F.wV0  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); >~_)2_j  
  //}}AFX_VIRTUAL ]`M2Kwp  
  // Implementation #\\|:`YV  
 protected: B lqISyrY  
  HICON m_hIcon; t8`wO+4@  
  // Generated message map functions 8#/y`ul  
  //{{AFX_MSG(CCaptureDlg) < pZwM  
  virtual BOOL OnInitDialog(); <LN7+7}  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); /*MioaQB}p  
  afx_msg void OnPaint(); "uFwsjz&B  
  afx_msg HCURSOR OnQueryDragIcon(); L$,yEMCe  
  virtual void OnCancel(); M{4XNE]m  
  afx_msg void OnAbout(); gFsqCx<q  
  afx_msg void OnBrowse(); rR 86D  
  afx_msg void OnChange(); W2'!Pc,W  
 //}}AFX_MSG -!}3bl*(7  
 DECLARE_MESSAGE_MAP() 3 FV -&Y  
}; Xt +9z  
#endif ^b.#4i (v  
Z B`d&!W>  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file <_#2+7Qs  
#include "stdafx.h" T"<)B^8f  
#include "Capture.h" h~ZLULW)B  
#include "CaptureDlg.h" ;#:AM;  
#include <windowsx.h> 5{ bc&?"  
#pragma comment(lib,"hook.lib") 9Vo*AK'&U  
#ifdef _DEBUG dqs~K7O^E  
#define new DEBUG_NEW ESYF4-d+  
#undef THIS_FILE #'0Yzh]qc  
static char THIS_FILE[] = __FILE__; xF@&wg  
#endif 8KYIHw  
#define IDM_SHELL WM_USER+1 %"eR0Lj+zq  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "%\hDL;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); } !y5hv!_  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; PjH'5Y  
class CAboutDlg : public CDialog 5n{d jP  
{ cv G*p||  
 public: 8;r#HtFM  
  CAboutDlg(); j[.nk  
  // Dialog Data ;j7G$s9  
  //{{AFX_DATA(CAboutDlg)  6su~SPh  
  enum { IDD = IDD_ABOUTBOX }; /;Hr{f jl{  
  //}}AFX_DATA {/H<_  
  // ClassWizard generated virtual function overrides }YVF fi~  
  //{{AFX_VIRTUAL(CAboutDlg) X%3?sH  
 protected: tW/g0lC%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S_/S2(V"  
  //}}AFX_VIRTUAL &K{8- t  
  // Implementation J=k=cFUX  
 protected:  @O koT:  
  //{{AFX_MSG(CAboutDlg) -z0;4O (K]  
  //}}AFX_MSG 3%5a&b  
  DECLARE_MESSAGE_MAP() kS8?N`2}LV  
}; zQG{j\  
V~ORb1  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) vg1J N"S[  
{ yDwh]t  
 //{{AFX_DATA_INIT(CAboutDlg) oJ\g0|\qwe  
 //}}AFX_DATA_INIT f?51sr  
} .<F46?HS  
bXOKC  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) fg3Jv*  
{ PPr Pj^%z=  
 CDialog::DoDataExchange(pDX);  d]`6N  
 //{{AFX_DATA_MAP(CAboutDlg) YnRO>`  
 //}}AFX_DATA_MAP LwK]fFtu  
} H8FvI"J  
CqlxE/|  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) }7[]d7  
 //{{AFX_MSG_MAP(CAboutDlg) 1+uZF  
 // No message handlers kpIn_Ea  
 //}}AFX_MSG_MAP Sb/?<$>  
END_MESSAGE_MAP() gVfFEF.  
t{jY@J T|  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) $|-Lw!)D  
: CDialog(CCaptureDlg::IDD, pParent) "u!gfG?oH  
{ *VsVCUCz5*  
 //{{AFX_DATA_INIT(CCaptureDlg) rs{)4.I  
  m_bControl = FALSE; XNWtX-[ ^@  
  m_bAlt = FALSE; tfGs| x  
  m_bShift = FALSE; Zek@xr;]  
  m_Path = _T("c:\\"); 7,+eG">0  
  m_Number = _T("0 picture captured."); E5n7 <  
  nCount=0; DOKe.k  
  bRegistered=FALSE; 7qB4_  
  bTray=FALSE; /B@{w-N  
 //}}AFX_DATA_INIT _w4G|j$C  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 OR+qi*)  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 0]|`*f&p;  
} ]u|v7}I4  
,SR7DiYg  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) U.Mfu9}#:  
{ dj Ojd,  
 CDialog::DoDataExchange(pDX); GpeW<% \P  
 //{{AFX_DATA_MAP(CCaptureDlg) o{sv<$  
  DDX_Control(pDX, IDC_KEY, m_Key); x950,`zy  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 1n8[fgz  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 9E2iZt]  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 2F:qaz  
  DDX_Text(pDX, IDC_PATH, m_Path); mZR3Hl$  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Q6qW?*Y  
 //}}AFX_DATA_MAP )y,^M3$?C  
} Ik0g(-d  
0hemXvv1  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) P }sr  
//{{AFX_MSG_MAP(CCaptureDlg) k."p&  
 ON_WM_SYSCOMMAND() ^9[Q;=R  
 ON_WM_PAINT() xak)YOLRV  
 ON_WM_QUERYDRAGICON() ^?VQ$o2  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) W "'6 M=*  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse)  rL{R=0  
 ON_BN_CLICKED(ID_CHANGE, OnChange) LORcf1X/  
//}}AFX_MSG_MAP h 3CA,$HJ  
END_MESSAGE_MAP() ' P?h?w^T  
al9wNtMT  
BOOL CCaptureDlg::OnInitDialog() e2O6q05 ?Q  
{ FDz`U:8  
 CDialog::OnInitDialog(); pZnp!!G  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8q[; 0  
 ASSERT(IDM_ABOUTBOX < 0xF000); 7Z6=e6/\  
 CMenu* pSysMenu = GetSystemMenu(FALSE); dkC[SG`  
 if (pSysMenu != NULL) SGAzeymw  
 { FH~:&;  
  CString strAboutMenu; h[mT4 e3c  
  strAboutMenu.LoadString(IDS_ABOUTBOX); v-{g  
  if (!strAboutMenu.IsEmpty()) 3Z b]@n  
  { entU+Or  
   pSysMenu->AppendMenu(MF_SEPARATOR); jc5[r;#  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); \vA*dQ-  
  } ;+9OzF ;  
 } U) J5K  
 SetIcon(m_hIcon, TRUE); // Set big icon m{/7)2.  
 SetIcon(m_hIcon, FALSE); // Set small icon yKc-:IBb{u  
 m_Key.SetCurSel(0); $h#sb4ek  
 RegisterHotkey(); `z&#|0O  
 CMenu* pMenu=GetSystemMenu(FALSE); C~ 1]  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Pyo|Sgk  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 23}` e  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 40t xZFQ0  
 return TRUE; // return TRUE unless you set the focus to a control JVc{vSa!rm  
} 8z9 {H  
g>lZs  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) R/vHq36d  
{ U$OZkHA[  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) -o ).<&#  
 { XiW1X6  
  CAboutDlg dlgAbout; W XQ@kQD  
  dlgAbout.DoModal(); *1)>He$qL  
 } n7Ao.b%uk-  
 else ^tB 1Nu %  
 { [YDSS/  
  CDialog::OnSysCommand(nID, lParam); -#v~;Ci  
 } MGg(d  
} s)^/3a  
^b8~X [1J_  
void CCaptureDlg::OnPaint() z(|^fi(  
{ x?h/e;  
 if (IsIconic()) rAenx Z,tF  
 { }9fa]D-a?  
  CPaintDC dc(this); // device context for painting t-\+t<;  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Ln+l'&_nb  
  // Center icon in client rectangle `Q@7,z=f  
  int cxIcon = GetSystemMetrics(SM_CXICON); S6~y!J6Ok4  
  int cyIcon = GetSystemMetrics(SM_CYICON); o@:"3s  
  CRect rect; fQ<sq0' e\  
  GetClientRect(&rect); ZEqW*piI  
  int x = (rect.Width() - cxIcon + 1) / 2; DH(<{ #u  
  int y = (rect.Height() - cyIcon + 1) / 2; A}9Z%U  
  // Draw the icon SDnl^a  
  dc.DrawIcon(x, y, m_hIcon); -C=0Pg]ga  
 } ;+Jx,{ )  
 else Xaq;d'  
 { &o:5lxR{  
  CDialog::OnPaint(); VvhfD2*T  
 } eM7@!CdA9q  
} OH`a3E{e  
Rh=" <'d  
HCURSOR CCaptureDlg::OnQueryDragIcon() y=3 dGOFB  
{  }k^uup*{  
 return (HCURSOR) m_hIcon; vX+oZj   
} J%&LQ9  
~A0]vcP  
void CCaptureDlg::OnCancel() YI0 wr1N  
{ RY-iFydPc  
 if(bTray) CoN[Yf3\  
  DeleteIcon(); FYAEM!dyy  
  CDialog::OnCancel(); (J:+'u  
} AWO)]rM  
Ot=>~(u0  
void CCaptureDlg::OnAbout() M 8},RR@{  
{ xT*'p&ap  
 CAboutDlg dlg; At7!Pas#@g  
 dlg.DoModal(); eg[EFI.h  
} g6M>S1oOO  
-gn0@hS0  
void CCaptureDlg::OnBrowse() >* -I Io  
{ g"-j/ c   
 CString str; DUOoTl p  
 BROWSEINFO bi; s:T%, xS  
 char name[MAX_PATH]; /!6'K  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); )nN!% |J  
 bi.hwndOwner=GetSafeHwnd(); YvY|\2^K  
 bi.pszDisplayName=name; -E-#@s  
 bi.lpszTitle="Select folder"; >y%H2][  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 8hGyh#  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); :jiEn y  
 if(idl==NULL) +gl\l?>sr  
  return; =s\$i0A2  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \0\O/^W0  
 str.ReleaseBuffer(); z "@^'{.l  
 m_Path=str; KzHN|8 $o  
 if(str.GetAt(str.GetLength()-1)!='\\') axQ>~v WN/  
  m_Path+="\\"; %i9S"  
 UpdateData(FALSE); TmgC {_  
} ing'' _  
;&d#)&O"e  
void CCaptureDlg::SaveBmp() {&1L &f<  
{ 0]d;)_`@  
 CDC dc; 9o@3$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); '|C%X7  
 CBitmap bm; 4$-R|@,|_  
 int Width=GetSystemMetrics(SM_CXSCREEN); ^t0!Dbx3SE  
 int Height=GetSystemMetrics(SM_CYSCREEN); 196aYLE  
 bm.CreateCompatibleBitmap(&dc,Width,Height); -}7$;QK&a  
 CDC tdc; A7 RI&g v5  
 tdc.CreateCompatibleDC(&dc); 6[m~xegG  
 CBitmap*pOld=tdc.SelectObject(&bm); n_kwtWX(  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); /k.0gYD  
 tdc.SelectObject(pOld); gT}H B.  
 BITMAP btm; =, XCjiBeC  
 bm.GetBitmap(&btm); OVLVsNg  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; WwmYJl0  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size);  y|LHnNQ  
 BITMAPINFOHEADER bih; %&L1 3:  
 bih.biBitCount=btm.bmBitsPixel; #|9W9\f,  
 bih.biClrImportant=0; zTng]Mvx  
 bih.biClrUsed=0; 9#DXA}  
 bih.biCompression=0; Sca"LaW1  
 bih.biHeight=btm.bmHeight; LOUP  
 bih.biPlanes=1; & bTCTDZh  
 bih.biSize=sizeof(BITMAPINFOHEADER); ')jItje|  
 bih.biSizeImage=size; V%-hP~nyBx  
 bih.biWidth=btm.bmWidth; a>j}@8[J  
 bih.biXPelsPerMeter=0; [8QK @5[  
 bih.biYPelsPerMeter=0; mSYjc)z  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); w=GMQ8  
 static int filecount=0; m]qw8BoU`F  
 CString name; g *$2qKm  
 name.Format("pict%04d.bmp",filecount++); ^Iw$ (  
 name=m_Path+name; P@N+jS`Vf  
 BITMAPFILEHEADER bfh; (Yewd/T  
 bfh.bfReserved1=bfh.bfReserved2=0; n>ryS/1  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ^50dF:V(1  
 bfh.bfSize=54+size; 'rhgM/I  
 bfh.bfOffBits=54; HXq']+iC  
 CFile bf; '5h` ="  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ NK|UeL7ght  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); B&cIx~+  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Nbl&al@"  
  bf.WriteHuge(lpData,size); e:O,$R#g  
  bf.Close(); g Wtc3  
  nCount++; ^hLr9k   
 } uj.i(U s  
 GlobalFreePtr(lpData); Pb&tWv\ql  
 if(nCount==1) `n&:\Ib  
  m_Number.Format("%d picture captured.",nCount); HA'~1$#z  
 else 4c5BlD  
  m_Number.Format("%d pictures captured.",nCount); aAjl 58  
  UpdateData(FALSE); PK]3uh  
} H<d~AurX)J  
5` ^@k<  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) =x<N+vjXY  
{ 8'PZA,CW  
 if(pMsg -> message == WM_KEYDOWN) 5Zq hyv=  
 { atyvo0fNd  
  if(pMsg -> wParam == VK_ESCAPE) B=0^Rysg  
   return TRUE; 01r%K@ xX\  
  if(pMsg -> wParam == VK_RETURN) P%2v(  
   return TRUE; qFmw9\Fn  
 } 9q'&tU'a=c  
 return CDialog::PreTranslateMessage(pMsg); HLWffO/  
} J*;RL`  
/DAR'9@h  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >~o- 6g  
{ .!3e$mhV  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Yw|v5/>  
  SaveBmp(); `nF SJlr&  
  return FALSE; x7S\-<8  
} = wz}yfdrC  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ZDW9H6ux  
 CMenu pop; .\ Ijq!  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Yc[umn^K  
 CMenu*pMenu=pop.GetSubMenu(0); L-|l$Ti"  
 pMenu->SetDefaultItem(ID_EXITICON); Y5aG^wE[:  
 CPoint pt; LdZVXp^  
 GetCursorPos(&pt); afrF%!  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ?~o`mg  
 if(id==ID_EXITICON) Mq\=pxC@  
  DeleteIcon(); 81Z;hO"~  
 else if(id==ID_EXIT) .~i|kc]Ue  
  OnCancel(); ~e}JqJ(97  
 return FALSE; G'JHimP2j  
} DP{nvsF  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); |^Iox0A  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) NzT &K7v  
 AddIcon(); BA h'H&;V  
 return res; RBQ8+^  
} 6*Z7JiQ 0  
gKh*q.  
void CCaptureDlg::AddIcon() Wk[a|>  
{ !+SL=xy!{  
 NOTIFYICONDATA data; rg^\gE6_  
 data.cbSize=sizeof(NOTIFYICONDATA); _V"0g=&Hc  
 CString tip; l|.}>SfL^u  
 tip.LoadString(IDS_ICONTIP); T<n`i~~  
 data.hIcon=GetIcon(0); W]po RTJ:  
 data.hWnd=GetSafeHwnd(); f\2IKpF2  
 strcpy(data.szTip,tip); |u>V> PN  
 data.uCallbackMessage=IDM_SHELL; ~uhW~bT  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; \WiCI:  
 data.uID=98; X7$]qE K  
 Shell_NotifyIcon(NIM_ADD,&data); _}5vO$kdO  
 ShowWindow(SW_HIDE); JSB+g;  
 bTray=TRUE; Z:{| ?4  
} Bc8&-eZ ,  
RL}?.'!  
void CCaptureDlg::DeleteIcon() |[rn/  
{ { { \oC$  
 NOTIFYICONDATA data; >J;TtNE:  
 data.cbSize=sizeof(NOTIFYICONDATA); "lt<$.  
 data.hWnd=GetSafeHwnd(); as@8L|i*  
 data.uID=98; #z P-, 2!r  
 Shell_NotifyIcon(NIM_DELETE,&data); tl_3 %$s  
 ShowWindow(SW_SHOW); ^0zfQu+!  
 SetForegroundWindow(); ,8384'  
 ShowWindow(SW_SHOWNORMAL); 20}HTV{v  
 bTray=FALSE; |Z>-<]p9g  
} 0h1u W26^  
ovp/DM  
void CCaptureDlg::OnChange() {z>!Fw  
{ 2q[pOT'k  
 RegisterHotkey(); qiet<F  
} @K <Onh`  
k' 8q /]  
BOOL CCaptureDlg::RegisterHotkey() k<1i.rh  
{ bo#xqSGQ  
 UpdateData(); gs1yWnSv5  
 UCHAR mask=0; V< F &\  
 UCHAR key=0; -L/%2 X  
 if(m_bControl) a &tWMxBr  
  mask|=4; -;gQy[U  
 if(m_bAlt) \~8W0q.4M  
  mask|=2; |-ZML~2S=h  
 if(m_bShift) h2'6W)  
  mask|=1; +Kgl/Wg%  
  key=Key_Table[m_Key.GetCurSel()]; Vja 4WK*  
 if(bRegistered){ yhgGvyD  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); c!HGiqp  
  bRegistered=FALSE; $Z;8@O3  
 } s=)W  
 cMask=mask; g#i~^4-1  
 cKey=key; v9H t~\>  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); f&$Bjq  
 return bRegistered; W^09tx/I  
} (^W}uDPCB  
m|fcWN[  
  四、小结 K^o$uUBe  
g5#LoGc  
  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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