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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%2pbGU  
  Jzh_`jW0l  
  一、实现方法 89~)nV)  
O(CUwk  
  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: 1#XMUbFc  
)KkA<O}f  
#pragma data_seg("shareddata") DLf6D | "  
HHOOK hHook =NULL; //钩子句柄 [S'ngQ"f`  
UINT nHookCount =0; //挂接的程序数目 }&ZO q'B  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 $YFn$.70\  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 GT`:3L  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey }KJ/WyYW  
static int KeyCount =0; AuSL?kZ4|Y  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 UtY< R  
#pragma data_seg() Ktg6*L/  
)J5(M`  
  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。 J/=b1{d"n  
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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: Gh|q[s*k  
"c=\?   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR !i0:1{.  
cKey,UCHAR cMask) g5_]^[up w  
{ `2 Z  
 BOOL bAdded=FALSE; q^k6.5*"  
 for(int index=0;index<MAX_KEY;index++){ ; *r5 d+]  
  if(hCallWnd[index]==0){ !=Cd1 $<  
   hCallWnd[index]=hWnd; WY  #pzBA  
   HotKey[index]=cKey; BIS5u4  
   HotKeyMask[index]=cMask; q>f1V3  
   bAdded=TRUE; kx*=1AfU+Y  
   KeyCount++; vxY7/_]  
   break; Y[@$1{YS  
  } m8#+w0p)  
 } nQb{/ TqC'  
 return bAdded; rC$ckug  
} `UGHk*DL)  
//删除热键 OV^) N  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) t d-EB&i\  
{ V]<J^m8  
 BOOL bRemoved=FALSE; @<r  ;>G  
 for(int index=0;index<MAX_KEY;index++){ L:j;;9Sp{  
  if(hCallWnd[index]==hWnd){ Cz8=G;\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ AI/xOd!a  
    hCallWnd[index]=NULL; 9Iy>oV  
    HotKey[index]=0; XF'K dz>p  
    HotKeyMask[index]=0; FNtcI7  
    bRemoved=TRUE; 44]/rP_m  
    KeyCount--; gVEW*8  
    break; G"3D"7f a  
   } U_B"B;ng+  
  } S3A OT  
 } Ks7DoXCvE  
 return bRemoved; {H=DeQ  
} l0l2fwz(  
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rK9X68)  
  DLL中的钩子函数如下: IEmtt^C  
lt`#or"o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) BMgiXdv.B  
{ ~f;d3dJ]/  
 BOOL bProcessed=FALSE; 58ev (f  
 if(HC_ACTION==nCode) [2WJ>2r}6  
 { mtOCk 5E  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 E0o=  
   switch(wParam) ? L|m:A`  
   {  $i7iv  
    case VK_MENU: gk1I1)p  
     MaskBits&=~ALTBIT; YP5V~-O/  
     break; Rbm"Qz  
    case VK_CONTROL: [yJcM [p\  
     MaskBits&=~CTRLBIT; .q"`)PT  
     break; %lF}!  
    case VK_SHIFT: t6W$t  
     MaskBits&=~SHIFTBIT; g/'CX}g`  
     break; A|Up >`QH  
    default: //judge the key and send message KD11<&4_x  
     break; 2zZ" }Zr#  
   } @rB!47!  
   for(int index=0;index<MAX_KEY;index++){ oQ{(7.e7)  
    if(hCallWnd[index]==NULL) |W[BqQIf  
     continue; f,wB.MN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Xb@lKX5Re  
    { "u@)   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); /{gCf  
     bProcessed=TRUE; /4}{SE  
    } 07:CcT  
   } xxpvVb)mF  
  } )S]4 Kt_  
  else if((lParam&0xc000ffff)==1){ //有键按下 H.3+5 po  
   switch(wParam) A'^y+42jY  
   { 8vjaQ5  
    case VK_MENU: D~P I_*h.  
     MaskBits|=ALTBIT; fo;Ftf0  
     break; c*sK| U7)  
    case VK_CONTROL: p(g0+.?`~  
     MaskBits|=CTRLBIT; [7]Kvb2t  
     break; @zSI@Oq_  
    case VK_SHIFT: iaPrkMhd  
     MaskBits|=SHIFTBIT; wi-O}*O   
     break; zUF%`CR  
    default: //judge the key and send message 7A@]t_83Y  
     break; qq9fZZb  
   } 2K0HN  
   for(int index=0;index<MAX_KEY;index++){ ]@wee08  
    if(hCallWnd[index]==NULL) r+r-[z D(  
     continue; kmXpj3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) EZlcpCS  
    { G}<%%U D  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 3GqvL_  
     bProcessed=TRUE; ;-Fr^|do y  
    } C]59@z;+bN  
   } E2+x?Sc+  
  } +nU"P  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 J{<,V\t)  
   for(int index=0;index<MAX_KEY;index++){ ;<i`6e  
    if(hCallWnd[index]==NULL) c'ExZ)RJ  
     continue; "^_9t'0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) lv\C(^mGq  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); MhaN+N  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 t6V@00M@  
   } k`[ L  
  } zX *+J"x  
 } Lx6C fR  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); qw={gZ  
} cyu)YxT  
Z:7X=t =  
  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: YaI8hj@}  
yyCx;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f-!t31?XK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7UM!<@9\  
wju2xM  
  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: 9,g &EnvG  
I[E/)R{\  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) f7NK0kuA  
{ =23JE'^=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) unn2MP'  
 { \@6P A  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 s2s}5b3  
  SaveBmp(); j<[+vrj  
  return FALSE; 94Wf ]  
 } rN* , U\q  
 …… //其它处理及默认处理 H=Sy.  
} yv2BbrYyy  
}H2<w-,+  
agdiJ-lyQ  
  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。 kH$)0nK  
N]qX^RSb  
  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。 $42%H#  
CtItzp  
  二、编程步骤 svki=GD_(.  
a:nMW'!  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Q(Uj5aX  
BfQRw>dZ"{  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Q?]307g7  
:{2exu  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; p<%76H A  
<~ E'% 60;  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; m E<n=g=  
m<]b]FQ  
  5、 添加代码,编译运行程序。 3e~X`K1Q<  
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三、程序代码 e]N?{s   
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL ^ ]Mlkd:  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) } ti+tM*  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_  J`F][ A  
#if _MSC_VER > 1000 :i'jQ<|wZN  
#pragma once ~]t/|xep  
#endif // _MSC_VER > 1000 )<W6cDx'H+  
#ifndef __AFXWIN_H__ F=}-ngx8&  
#error include 'stdafx.h' before including this file for PCH 38(Cj~u=3  
#endif LZC)vF5  
#include "resource.h" // main symbols &Z Ja}5k!r  
class CHookApp : public CWinApp ?Uz7($}  
{ F^Q[P4>m\  
 public: \VJ7ahg[\  
  CHookApp(); w783e  
  // Overrides n- cEa/g  
  // ClassWizard generated virtual function overrides cQj{[Wt4  
  //{{AFX_VIRTUAL(CHookApp) G}.t!"  
 public: sR%,l  
  virtual BOOL InitInstance(); 8'c_&\kdv  
  virtual int ExitInstance(); -4:L[.2  
  //}}AFX_VIRTUAL =l%"Om*A  
  //{{AFX_MSG(CHookApp) ZT@a2:&  
  // NOTE - the ClassWizard will add and remove member functions here. |cZKj|0>  
  // DO NOT EDIT what you see in these blocks of generated code ! Id->F0x0  
  //}}AFX_MSG )dFTH?Mpo  
  DECLARE_MESSAGE_MAP() };m.Y>=)K  
}; [Tv!Pc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 6wV{}K^0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `a.1Af;L  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~i&Lc7Xl  
BOOL InitHotkey(); E2f9J{ Ki=  
BOOL UnInit(); 0:<dj:%M  
#endif B5%N@g$`j  
Q=hf,/N  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. xv! QO  
#include "stdafx.h" [;5?=X,LD  
#include "hook.h" y7 tK>aD}  
#include <windowsx.h> 4BSSJ@z  
#ifdef _DEBUG wr\d5j  
#define new DEBUG_NEW  gB\ a  
#undef THIS_FILE 0>jo+b\D$  
static char THIS_FILE[] = __FILE__; vF45tw  
#endif |Tz/9t  
#define MAX_KEY 100 >icK]W  
#define CTRLBIT 0x04 (+g!~MP  
#define ALTBIT 0x02 +*OY%;dQ7@  
#define SHIFTBIT 0x01 4qw&G  
#pragma data_seg("shareddata") qGS]2KY  
HHOOK hHook =NULL; | ?Js)i  
UINT nHookCount =0; pq;)l( Hi  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey B@w Q [  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ;D5B$ @W>  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey zw=as9z1-  
static int KeyCount =0; muSQFIvt  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 9HI9([Cs  
#pragma data_seg() wA`A+Z2*?  
HINSTANCE hins; Dim,HPx]d  
void VerifyWindow(); BS}uv3  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) <L+D  
//{{AFX_MSG_MAP(CHookApp) x Hw$  
// NOTE - the ClassWizard will add and remove mapping macros here. ,"/<N*vh  
// DO NOT EDIT what you see in these blocks of generated code! oL'  :07_  
//}}AFX_MSG_MAP gd9ZlHo'Id  
END_MESSAGE_MAP() d7o~$4h|  
kTQ`$V(>&  
CHookApp::CHookApp() n*\AB=|X  
{ Jt4T)c9  
 // TODO: add construction code here, c9e  }P  
 // Place all significant initialization in InitInstance ]1]  
} ye U4,K o  
H >@yC  
CHookApp theApp; [MM11K  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) h~$Q\WCm#  
{ #mqz*=L3  
 BOOL bProcessed=FALSE; NJ-cP m  
 if(HC_ACTION==nCode) 7{oG4X!  
 { SZ}t_w `  
  if((lParam&0xc0000000)==0xc0000000){// Key up Mnpb".VU#T  
   switch(wParam) B^(0>Da\  
   { D]+tr%  
    case VK_MENU: l'N>9~f  
     MaskBits&=~ALTBIT; UQz8":#V  
     break; tYt/m6h  
    case VK_CONTROL: qIQvix$8  
     MaskBits&=~CTRLBIT; _\ n'uW$  
     break; |N[SCk>Kj  
    case VK_SHIFT: &o/&T{t}  
     MaskBits&=~SHIFTBIT; 1 sCF -r  
     break; CORNN8=k  
    default: //judge the key and send message !ViHC}:   
     break; d>F=|dakL  
   } ff"Cl p  
   for(int index=0;index<MAX_KEY;index++){ BY: cSqAW  
    if(hCallWnd[index]==NULL) whP>'9t.w  
     continue; (E)/' sEb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %j=E}J<H5*  
    { c Xcn}gKV  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8}p5MG  
     bProcessed=TRUE; >*A\/Da]j  
    } La}=Ng  
   } 9;;1 "^4/  
  } Yg%V  
  else if((lParam&0xc000ffff)==1){ //Key down 6YT*=\KT  
   switch(wParam) |::kC3=  
   { (CY VSO  
    case VK_MENU: 6m21Y8N  
     MaskBits|=ALTBIT; Ov%9S/d  
     break; /B!"\0G/,  
    case VK_CONTROL: ja2LQe@ Q  
     MaskBits|=CTRLBIT; GpF,=:  
     break; >fo &H_a  
    case VK_SHIFT: d; @Kz^  
     MaskBits|=SHIFTBIT; 9a)D8  
     break; Db yy H_  
    default: //judge the key and send message b]6;:Q!d  
     break; />\.zuAr&  
   } J8a4.prqI  
   for(int index=0;index<MAX_KEY;index++) Z.m.Uyz{7  
   { HkxFDU-K  
    if(hCallWnd[index]==NULL) I_xJ[ALdm  
     continue; w`1qx;/!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O3*Vilx  
    { -tx)7KV-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =fBJQK2sk  
     bProcessed=TRUE; @6.1EK0  
    } )@Xdr0  
   } %{/0K<M  
  } ' 7>}I{Lq  
  if(!bProcessed){ D]b5*_CT  
   for(int index=0;index<MAX_KEY;index++){ 4E3HYZ  
    if(hCallWnd[index]==NULL) -<&"geJA  
     continue; O\OG~`HBN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :[(X!eP  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); )2F:l0g  
   } k` (_~/#  
  } c<JJuG  
 } /]]\jj#^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 1; L!g*!E  
} 6?}8z q[  
R|NmkqTK~(  
BOOL InitHotkey() bz H5Lc{%  
{ OAw/  
 if(hHook!=NULL){ Q*$x!q  
  nHookCount++; /[nt=#+   
  return TRUE; J+?xfg  
 } :'GTCo$3  
 else K r]!BI?z  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);  =sG(l  
  if(hHook!=NULL) N!RyncJ  
   nHookCount++; wrsETB c  
  return (hHook!=NULL); \"Sqr(~_  
} ? dSrY  
BOOL UnInit() 2%vwC]A  
{ ,O a)  
 if(nHookCount>1){ @uY%;%Pa8  
  nHookCount--; M~N'z /  
  return TRUE; x+yt| &B  
 } Q'~;RE%T  
 BOOL unhooked = UnhookWindowsHookEx(hHook); :g<dwuVO  
 if(unhooked==TRUE){ :Np&G4IM>  
  nHookCount=0; Y<#7E;aL  
  hHook=NULL; XfbkK )d  
 } `! m+g0  
 return unhooked; tGmyTBgx  
} N.eSf  
; p\rgam  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) L1)?5D  
{ m}Tu^dy  
 BOOL bAdded=FALSE; D>*%zz|  
 for(int index=0;index<MAX_KEY;index++){ y''?yr  
  if(hCallWnd[index]==0){ [+GQ3Z\  
   hCallWnd[index]=hWnd; T_AZCl4d  
   HotKey[index]=cKey; FIU( 2  
   HotKeyMask[index]=cMask; ci3{k"  
   bAdded=TRUE; 9M01}  
   KeyCount++; 9zO;sg;3  
   break; kV6>O C&^  
  } wZrdr4j  
 } Bfw>2  
 return bAdded; P!bm$h*3?  
} }aX).u  
 mH?^3T  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) FLy|+4D_%4  
{ ,  PN?_N  
 BOOL bRemoved=FALSE; 103^\Av8  
 for(int index=0;index<MAX_KEY;index++){ , st4K;-  
  if(hCallWnd[index]==hWnd){ $#Ji=JX  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ u> >t"w  
    hCallWnd[index]=NULL; 0HxF#SlKM  
    HotKey[index]=0; :^iR&`2~  
    HotKeyMask[index]=0; sOJ"~p  
    bRemoved=TRUE; -QS_bQG%  
    KeyCount--; ,rX!V=Z5  
    break; <B u*:O  
   } $$qhX]^ ~  
  } >Ckb9A  
 } $ HUCp9  
 return bRemoved; 3'&]v6|  
} iQa Q"s  
2? !b!  
void VerifyWindow() kFk+TXLDIt  
{ O~aS&g/sf  
 for(int i=0;i<MAX_KEY;i++){ &a:>P>\  
  if(hCallWnd!=NULL){ nh9K(  
   if(!IsWindow(hCallWnd)){ kt;X|`V{5z  
    hCallWnd=NULL; wRie{Vk  
    HotKey=0; /[EI0 ~P  
    HotKeyMask=0; `VBjH]$  
    KeyCount--; .Uih|h  
   } >656if O  
  } o_G.J4 V  
 } T,?^J-h^  
} ',1rW  
xOu cZ+  
BOOL CHookApp::InitInstance() 89 (k<m  
{ 5gJQr%pS  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); SH}O?d\Q:  
 hins=AfxGetInstanceHandle(); Uc9Uj  
 InitHotkey(); .2Rh_ful  
 return CWinApp::InitInstance(); 8:M~m]Z+|  
} _bMs~%?~/  
80+" x3r  
int CHookApp::ExitInstance() W BiBtU  
{ g?@(+\W  
 VerifyWindow(); Z.R^@@RqJ  
 UnInit(); <,cDEN7  
 return CWinApp::ExitInstance(); 8@$QN4^u^  
} $rjv4e}7  
@[JQCQ#r  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file D %5 0  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) n7{c0;)$  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ +JQN=nTA  
#if _MSC_VER > 1000 $fh?(J  
#pragma once ,[ Ytl  
#endif // _MSC_VER > 1000  &$+yXN  
Jn:GqO  
class CCaptureDlg : public CDialog Y,&)%Eo<  
{ Z3#3xG5pl  
 // Construction "HYK~V  
 public: 2'@0|k,yC  
  BOOL bTray; 14^t{  
  BOOL bRegistered; o^AK@\e:^Z  
  BOOL RegisterHotkey(); ul% q6=f)  
  UCHAR cKey; TkQ05'Qc  
  UCHAR cMask; 3cOXtDV YT  
  void DeleteIcon(); *YDx6\><  
  void AddIcon(); v1)jZ.:  
  UINT nCount; :W'1Q2  
  void SaveBmp(); ^rxXAc[  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor LL,~&5{  
  // Dialog Data v=X\@27= ?  
  //{{AFX_DATA(CCaptureDlg) oHa6fi  
  enum { IDD = IDD_CAPTURE_DIALOG }; lv8tS-  
  CComboBox m_Key; bo@1c0  
  BOOL m_bControl; "kN5AeRg  
  BOOL m_bAlt; q+m&V#FT%  
  BOOL m_bShift; -i;#4@^t  
  CString m_Path; )T2Sw z/  
  CString m_Number; M=!x0V;  
  //}}AFX_DATA (oTx*GP>Y  
  // ClassWizard generated virtual function overrides W~7q&||;C  
  //{{AFX_VIRTUAL(CCaptureDlg) u|w[ b9^r  
 public: d ch(HB}[  
  virtual BOOL PreTranslateMessage(MSG* pMsg); cPtP?)38.  
 protected: hy6px  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &i!.6M2  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Mv ;7kC7]  
  //}}AFX_VIRTUAL [(dAv7YbN  
  // Implementation .UJDn^@  
 protected: |:EUh  
  HICON m_hIcon; Cjwg1?^RZ  
  // Generated message map functions naAZR*(A  
  //{{AFX_MSG(CCaptureDlg) 2j_L jY'7  
  virtual BOOL OnInitDialog(); 7qnw.7p  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ]p$fEW g  
  afx_msg void OnPaint(); _/PjeEm $p  
  afx_msg HCURSOR OnQueryDragIcon(); `@Qq<T}V  
  virtual void OnCancel(); p-Q1abl  
  afx_msg void OnAbout(); W;hI[9  
  afx_msg void OnBrowse(); r?[Zf2&  
  afx_msg void OnChange(); wRWN]Vo  
 //}}AFX_MSG vmk c]DC  
 DECLARE_MESSAGE_MAP() y|1-,u.$  
}; #&$4tTl  
#endif wtRAq/  
xOEj+%M  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $)PNf'5Zg  
#include "stdafx.h" -o=qYkyLK  
#include "Capture.h" 1o.]"~0:  
#include "CaptureDlg.h" = [:ruE  
#include <windowsx.h> t/nu/yz5E  
#pragma comment(lib,"hook.lib") iXXgPapz  
#ifdef _DEBUG PY) 74sa  
#define new DEBUG_NEW .+ _x|?'  
#undef THIS_FILE xe_c`%_  
static char THIS_FILE[] = __FILE__; %)]{*#N4  
#endif [dUW3}APV  
#define IDM_SHELL WM_USER+1  H'2pmwk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $e0sa=/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); AC 3 ;i  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; =G*<WcR  
class CAboutDlg : public CDialog m}8c.OJ>K`  
{ Thz&wH`W  
 public: ,.DU)Wi?}  
  CAboutDlg(); ]V}";cm;2  
  // Dialog Data l$z-'  
  //{{AFX_DATA(CAboutDlg) iao_w'tJ  
  enum { IDD = IDD_ABOUTBOX }; ?L7z\b"_~  
  //}}AFX_DATA q?JP\_o:  
  // ClassWizard generated virtual function overrides hXZk$a'  
  //{{AFX_VIRTUAL(CAboutDlg) S{&;  
 protected: _W&.{ 7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (?oK+,v?L  
  //}}AFX_VIRTUAL 7TlOF  
  // Implementation .p <!2   
 protected: 3rOv j&2  
  //{{AFX_MSG(CAboutDlg) f`vB$r>  
  //}}AFX_MSG ])vM# f  
  DECLARE_MESSAGE_MAP() z,$^|'pP  
}; Dy0RZF4_  
i?||R|>;"'  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5Vf#(r f  
{ na>UFw7>*  
 //{{AFX_DATA_INIT(CAboutDlg) 02?y%  
 //}}AFX_DATA_INIT Sh=z  
} n{=vP`V_  
~#O nA1)  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) <Y<%=`  
{ ".~,(*  
 CDialog::DoDataExchange(pDX); | [P!9e  
 //{{AFX_DATA_MAP(CAboutDlg) C+jlIT+  
 //}}AFX_DATA_MAP {ge^&l  
}  O &;Cca  
,D;d#fJ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +>Y2luR1  
 //{{AFX_MSG_MAP(CAboutDlg) yP6^& 'I+  
 // No message handlers 7'CdDB6&.  
 //}}AFX_MSG_MAP THkg,*;:  
END_MESSAGE_MAP() }-!0d*I  
-I '#G D>  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Jro)  
: CDialog(CCaptureDlg::IDD, pParent) 8FU8E2zo  
{ g \&Z_  
 //{{AFX_DATA_INIT(CCaptureDlg) `l'z#\  
  m_bControl = FALSE; <Zn]L:  
  m_bAlt = FALSE; b-\ 1D;]  
  m_bShift = FALSE; 2w+w'Ag_R  
  m_Path = _T("c:\\"); (HDR}!.E  
  m_Number = _T("0 picture captured."); i=nd][1n  
  nCount=0; h b_"E, `F  
  bRegistered=FALSE; B[epI3 R  
  bTray=FALSE; V*}ft@GPD  
 //}}AFX_DATA_INIT 4ba[*R2  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ,F!zZNW9  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Z<@0~t_:?p  
} xN'$ Yh  
 l|j  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) /R!:ll2  
{ O,x[6P54P  
 CDialog::DoDataExchange(pDX); YZMSiDv[e  
 //{{AFX_DATA_MAP(CCaptureDlg) xG/B$DLn  
  DDX_Control(pDX, IDC_KEY, m_Key); `zw XfY,%  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); r roI  
  DDX_Check(pDX, IDC_ALT, m_bAlt); X@RS /  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); [+ K jun_  
  DDX_Text(pDX, IDC_PATH, m_Path); _ VKBzOH  
  DDX_Text(pDX, IDC_NUMBER, m_Number); h'jc4mu0  
 //}}AFX_DATA_MAP "m4. _4U  
} <Z5-?wgf9  
g]vo."}5E  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 41Hv)}Yd  
//{{AFX_MSG_MAP(CCaptureDlg) e#!%:M;4P  
 ON_WM_SYSCOMMAND() 3K!(/,`  
 ON_WM_PAINT() jmPnUn  
 ON_WM_QUERYDRAGICON() |Bz1u|uc  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) [;t-XC?[nk  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) J2adG+=  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 0"}J!c<g  
//}}AFX_MSG_MAP kOdXbw9v  
END_MESSAGE_MAP() WPI<SsLd  
. |%n"{  
BOOL CCaptureDlg::OnInitDialog() 4A"3C  
{ ``4e&  
 CDialog::OnInitDialog(); ;x%"o[[>  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); :y'EIf  
 ASSERT(IDM_ABOUTBOX < 0xF000); EM QGP<[  
 CMenu* pSysMenu = GetSystemMenu(FALSE); \Kr8k`f  
 if (pSysMenu != NULL) 2*Zk^h=  
 { G%iT L"6  
  CString strAboutMenu; %e^GfZ  
  strAboutMenu.LoadString(IDS_ABOUTBOX); =gNPS 0H  
  if (!strAboutMenu.IsEmpty()) n&OM~Vs  
  { '.EO+1{a  
   pSysMenu->AppendMenu(MF_SEPARATOR); mX 3p   
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); >m]LV}">O  
  } h?[|1.lJx(  
 } 17$'r^t,S  
 SetIcon(m_hIcon, TRUE); // Set big icon xP4}LL9)  
 SetIcon(m_hIcon, FALSE); // Set small icon e[ yN  
 m_Key.SetCurSel(0); (qglD  
 RegisterHotkey(); ja^_Lh9  
 CMenu* pMenu=GetSystemMenu(FALSE); .DNPL5[v  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); !]5}N^X  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); @<NuuYQ&  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ;/:Sx/#s  
 return TRUE; // return TRUE unless you set the focus to a control 5`Q j<   
} t:MSV?  
v5>A1\  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [?%q,>F  
{ >)F "lR:o  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) zD)/QFILy  
 { Hvb8+"?~  
  CAboutDlg dlgAbout; KpA1Ac)T  
  dlgAbout.DoModal(); ?4A/?Z]ub  
 } &AN1xcx\  
 else B (Ps/  
 { cbN;Kv?ak}  
  CDialog::OnSysCommand(nID, lParam); m g,1*B'  
 } ^/_Yk.w  
} T/a=z  
4-~Z{#-  
void CCaptureDlg::OnPaint() &rGB58  
{ KL9k9|!p  
 if (IsIconic()) fIl;qGz85  
 { WQ{[q" O  
  CPaintDC dc(this); // device context for painting w A\5-C7 j  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); z/u^  
  // Center icon in client rectangle 8N%nG( 0  
  int cxIcon = GetSystemMetrics(SM_CXICON); |BbzRis  
  int cyIcon = GetSystemMetrics(SM_CYICON); dvZH~mF  
  CRect rect; (:aU"5M  
  GetClientRect(&rect); dgL>7X=7  
  int x = (rect.Width() - cxIcon + 1) / 2;  D|)a7_  
  int y = (rect.Height() - cyIcon + 1) / 2; OvAhp&k  
  // Draw the icon +$|fUn{  
  dc.DrawIcon(x, y, m_hIcon); W:,Wex^9n  
 } ]} dQ~lOE  
 else k,[*h-{8  
 { D"rbQXR7$  
  CDialog::OnPaint(); #MKM.T,\t  
 } #=t/wAE y:  
} Jy5sZ }t[  
u<Y#J,p`e  
HCURSOR CCaptureDlg::OnQueryDragIcon()  =*&[K^  
{ l|=4FIMD  
 return (HCURSOR) m_hIcon; +LF#XS@  
} w8XCU> |  
f. "\~  
void CCaptureDlg::OnCancel() xNzGp5H  
{ Nai5!_'  
 if(bTray) ?u|@,tQ[  
  DeleteIcon(); 4qE95THB  
  CDialog::OnCancel(); _Z23lF 9  
} 8LbwEKl  
)\|+G5#`  
void CCaptureDlg::OnAbout() ]QhTxrF"  
{ 6|zhqb|s  
 CAboutDlg dlg; 5BJ E  
 dlg.DoModal(); ;%9]G|*{  
} tO&ffZP8$  
v8)"skVnFG  
void CCaptureDlg::OnBrowse() h:nybLw?  
{ fC[za,PXaE  
 CString str; EHk\Q\  
 BROWSEINFO bi; HR}O:2'  
 char name[MAX_PATH]; DsejZ&  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); lj (y  
 bi.hwndOwner=GetSafeHwnd(); H/c (m|KK  
 bi.pszDisplayName=name; ]3rVULU"K-  
 bi.lpszTitle="Select folder"; Iko]c_W0  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; g w" \pD  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); N-gYamlQ  
 if(idl==NULL) u.|Z3=?VG  
  return; F!]Sr'UA  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Ot2o=^Ng  
 str.ReleaseBuffer(); y3zP`^  
 m_Path=str; Ix5&B6L8  
 if(str.GetAt(str.GetLength()-1)!='\\') rW:krx9  
  m_Path+="\\"; );$99t  
 UpdateData(FALSE); TaN{xpo  
} _y@].G  
+n)n6} S  
void CCaptureDlg::SaveBmp() l4>^79**  
{ {'5"i?>s0>  
 CDC dc; <h/%jM>9/  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); `7CK;NeT  
 CBitmap bm; [d: u(  
 int Width=GetSystemMetrics(SM_CXSCREEN); 0B}4$STOo[  
 int Height=GetSystemMetrics(SM_CYSCREEN); H$KO[mW}  
 bm.CreateCompatibleBitmap(&dc,Width,Height); *'?7OL  
 CDC tdc; %2?+:R5.  
 tdc.CreateCompatibleDC(&dc); xT%`"eM}  
 CBitmap*pOld=tdc.SelectObject(&bm); n t}7|h|  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); p;O%W@n"  
 tdc.SelectObject(pOld); UFG_ZoD+  
 BITMAP btm; uu9M}]mDl  
 bm.GetBitmap(&btm); # ]7Lieh[5  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; *\sPHz.  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); kAki 9a(=!  
 BITMAPINFOHEADER bih; D|N4X`T`  
 bih.biBitCount=btm.bmBitsPixel;  .Q{RT p  
 bih.biClrImportant=0; SIe!=F[  
 bih.biClrUsed=0; |eqBCZn  
 bih.biCompression=0; *MP.YI:h  
 bih.biHeight=btm.bmHeight; : ?>7Z6  
 bih.biPlanes=1; CD$#}Id  
 bih.biSize=sizeof(BITMAPINFOHEADER); 'X^auyL  
 bih.biSizeImage=size; #Wk=y?sn  
 bih.biWidth=btm.bmWidth; e-nA>v  
 bih.biXPelsPerMeter=0; @^P^- B  
 bih.biYPelsPerMeter=0; CKYg!\g(:  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); CM;b_E)9)f  
 static int filecount=0; =p+y$  
 CString name; !%iHJwS#  
 name.Format("pict%04d.bmp",filecount++); E TT46%Y  
 name=m_Path+name; (W ~K1]  
 BITMAPFILEHEADER bfh; UB/> Ro  
 bfh.bfReserved1=bfh.bfReserved2=0; ZJYn[\]  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Qp>leEs]+6  
 bfh.bfSize=54+size; CU'JvVe3  
 bfh.bfOffBits=54; J ^'El^F  
 CFile bf; Zxa.x?:?n  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ t`Kbm''d[  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 6b2UPI7m~  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); @ZjT_  
  bf.WriteHuge(lpData,size); lQn" 6o1  
  bf.Close(); U2q6^z4l  
  nCount++; Xz$4cI#n:  
 } g.lTNQm$u  
 GlobalFreePtr(lpData); *'%V}R[>  
 if(nCount==1) &Y]':gJ  
  m_Number.Format("%d picture captured.",nCount); +y GQt3U  
 else ,T$ts  
  m_Number.Format("%d pictures captured.",nCount); qJhsMo2IH  
  UpdateData(FALSE); j~CnMKN  
} (|gQ i{8  
)@PnpC%H  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) L, JQ\!c  
{ ?'a8QJo  
 if(pMsg -> message == WM_KEYDOWN) JMb_00r  
 { oQ$yr^M  
  if(pMsg -> wParam == VK_ESCAPE) p0+^wXi)  
   return TRUE; bSB%hFp=Cp  
  if(pMsg -> wParam == VK_RETURN) SmRlZ!%e  
   return TRUE; XYEwn_Y  
 } IG781:,/  
 return CDialog::PreTranslateMessage(pMsg); fab'\|Y   
} ,X4e?$7g  
d2rs+-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #36Q O  
{ g^AQBF  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ N[%u>!  
  SaveBmp(); T$4{fhV \  
  return FALSE; S c)^k  
} _?{7%(C  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ JJ?{V:  
 CMenu pop; Ei;tfB  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Z_d"<k}I  
 CMenu*pMenu=pop.GetSubMenu(0); "yWw3(V2>  
 pMenu->SetDefaultItem(ID_EXITICON); PRKZg]?  
 CPoint pt; o/5-T4  
 GetCursorPos(&pt); ex3Qbr  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); *ByHTd  
 if(id==ID_EXITICON) *rxr:y#Ve  
  DeleteIcon(); 5/meH[R\M  
 else if(id==ID_EXIT) Ve,g9I  
  OnCancel(); !"<[&  
 return FALSE; LP<A q  
} _plK(g-1J%  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -dntV=  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) }z3j7I  
 AddIcon();  g'0CYY  
 return res; ^D yw(>9  
} {e|qQ4~h  
yI0bSu<j-  
void CCaptureDlg::AddIcon() t@q'm.:uw<  
{ ^ Ltho`  
 NOTIFYICONDATA data; Q8p6n  
 data.cbSize=sizeof(NOTIFYICONDATA); .Y)[c. ,j  
 CString tip; !Ok(mgV$/  
 tip.LoadString(IDS_ICONTIP); -YRIe<}E -  
 data.hIcon=GetIcon(0); F:{*4b  
 data.hWnd=GetSafeHwnd(); Q$jEmmm%V[  
 strcpy(data.szTip,tip); Dk1& <} I  
 data.uCallbackMessage=IDM_SHELL; 5!-TLwl`j\  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; g: i5%1  
 data.uID=98; 9}573M  
 Shell_NotifyIcon(NIM_ADD,&data); zWsr|= [  
 ShowWindow(SW_HIDE); i\R0+ O{  
 bTray=TRUE; OM*_%UF  
} ua\t5M5  
&C 9hT  
void CCaptureDlg::DeleteIcon() 3h@]cWp  
{ FDHW' OP4  
 NOTIFYICONDATA data; ^t >mdxuq  
 data.cbSize=sizeof(NOTIFYICONDATA); ;KeU f(tH  
 data.hWnd=GetSafeHwnd(); l_B735  
 data.uID=98; z>x@o}#u\|  
 Shell_NotifyIcon(NIM_DELETE,&data); 7[m?\/K~  
 ShowWindow(SW_SHOW); ."Ms7=  
 SetForegroundWindow(); 1{}p_"s>  
 ShowWindow(SW_SHOWNORMAL); JA^o/%a^  
 bTray=FALSE; ^X#y'odtbS  
} RObnu*  
-<iP$,bq72  
void CCaptureDlg::OnChange() @[GV0*yz$  
{ e#Tv5O  
 RegisterHotkey(); +pofN-*%  
} *}[\%u$ T  
\pmS*Dt  
BOOL CCaptureDlg::RegisterHotkey() GES}o9?#  
{ }@DCcf$<  
 UpdateData(); ) SV.|  
 UCHAR mask=0; ((y|?Z$  
 UCHAR key=0; Fs+ tcr/\[  
 if(m_bControl) O zAIz+`  
  mask|=4; 4kOO3[r  
 if(m_bAlt) =BJLj0=N  
  mask|=2; %sa?/pjK  
 if(m_bShift) j"W>fC/u  
  mask|=1; +UzQJt/>>  
  key=Key_Table[m_Key.GetCurSel()]; Y&|Z*s+ +}  
 if(bRegistered){ 6FS%9.Ws  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); kY0HP a  
  bRegistered=FALSE; $|4@Zx4vf  
 } [W[{ 4 Xu  
 cMask=mask; bS_#3T  
 cKey=key; #3uv^m LGa  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (vXr2Z<l  
 return bRegistered; Sp `l>BL  
} FO{=^I5YA  
1 ZdB6U0  
  四、小结 %6K7uvTq  
$l.*;h*  
  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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