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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: 1PwqW g-\\  
  %lL^[`AR  
  一、实现方法 7"L`|O?8)  
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  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: FcR(uv<  
hY5G=nbO*  
#pragma data_seg("shareddata") $s]c'D)  
HHOOK hHook =NULL; //钩子句柄 3Q-i%7l  
UINT nHookCount =0; //挂接的程序数目 jI`1>>N&1  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 aBV{Xr~#(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 caA>; +aBH  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey tx-HY<  
static int KeyCount =0; SoS GQ&k  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 $6p_`LD0  
#pragma data_seg() n0o'ns  
x50,4J%J'r  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 WdXi  
C %l!"s^  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: &p\fdR4e  
/mELnJ^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR yFfa/d  
cKey,UCHAR cMask) fX)C8J^=G  
{ \/8 I6a=  
 BOOL bAdded=FALSE; ]6wo]nV[P  
 for(int index=0;index<MAX_KEY;index++){ eQBR*@x  
  if(hCallWnd[index]==0){ ?t LJe  
   hCallWnd[index]=hWnd; XY(3!>/eQ[  
   HotKey[index]=cKey; 5w:   
   HotKeyMask[index]=cMask; -Fcg}\9  
   bAdded=TRUE; Y6(I %hE`  
   KeyCount++; a<CN2e_Z  
   break; &@E{0ZD  
  } 5<-_"/_  
 } d8 1u  
 return bAdded; uo`O$k<;  
} Mx,QgYSu  
//删除热键 {3RY4HVT?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `N 0Mm7  
{ AF5$U8jf  
 BOOL bRemoved=FALSE; !f~ =p  
 for(int index=0;index<MAX_KEY;index++){ Wb!"L`m  
  if(hCallWnd[index]==hWnd){ )wU.|9o]M  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ mmC&xZ5f  
    hCallWnd[index]=NULL; YmP`Gg#> p  
    HotKey[index]=0; ]<z4p'F1%  
    HotKeyMask[index]=0; [da,SM  
    bRemoved=TRUE; 1(V>8}zn  
    KeyCount--; }{Y)[w#R  
    break; <I.anIB:U  
   } m2o*d$Ke  
  } LQVa,'  
 } v3 $+ l1  
 return bRemoved; #NZ\UmA  
} "e WN5 2  
U1?*vwfKZ  
<{rRcFR  
  DLL中的钩子函数如下: t#s?:  
Y,O)"6ev  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) pDr%uL  
{ %U]_1"d,<\  
 BOOL bProcessed=FALSE; x\qS|q\N  
 if(HC_ACTION==nCode) G([8Q8B4 +  
 { _D9` L&X}  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ^4@~\#$z  
   switch(wParam) vywd&7gK  
   {  7.4Q  
    case VK_MENU: \VL[,z=q.  
     MaskBits&=~ALTBIT; i~\fpay  
     break; 9W$d'IA  
    case VK_CONTROL: +QNFu){G  
     MaskBits&=~CTRLBIT; e(/~;"r{  
     break; l"%|VWZ{iq  
    case VK_SHIFT: b&.j>=  
     MaskBits&=~SHIFTBIT; !a&@y#x  
     break; V|.3Z\(  
    default: //judge the key and send message 5>.)7D%  
     break; [uxhdR`T  
   } wT?.Mte  
   for(int index=0;index<MAX_KEY;index++){ G)28#aH  
    if(hCallWnd[index]==NULL) rK%<2i  
     continue; ajIgL<x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5Z{h!}Y  
    { y(&JE^GfX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2.)@u~^Q  
     bProcessed=TRUE; T:+%3+;a  
    } k|W=kt$P  
   } 'LZF^m _<<  
  } b#h?O}  
  else if((lParam&0xc000ffff)==1){ //有键按下 Uq/#\7/rL  
   switch(wParam) Ui6f>0?  
   { (uG.s%I  
    case VK_MENU: uG1 1~uAt  
     MaskBits|=ALTBIT; +pU\;x  
     break; =PXQ X(_  
    case VK_CONTROL: [KXxn>n  
     MaskBits|=CTRLBIT; w[w{~`([",  
     break; W69 -,w/  
    case VK_SHIFT: l,Un7]*  
     MaskBits|=SHIFTBIT; JpN]j`  
     break; m%ZJp7C  
    default: //judge the key and send message J_tj9+r^  
     break; 82F q}N <  
   } K @3 yS8F  
   for(int index=0;index<MAX_KEY;index++){ 1aKYxjYM  
    if(hCallWnd[index]==NULL) *<*{gO?Q4  
     continue; 0'!v-`.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m#SDB6l  
    { ;+]9KIa_Pq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Dt,b\6  
     bProcessed=TRUE; 0;z-I"N  
    } yoTbIQ  
   } *_d+cG  
  } WjZJQK  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 t1p}   
   for(int index=0;index<MAX_KEY;index++){ gd'#K~?  
    if(hCallWnd[index]==NULL) BCB"& :}  
     continue; zAEq)9Y"l'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `<IT LT  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9"_JiX~3  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ws?BAfP  
   } i:`ur  
  } ? lC. Pq  
 } XQ.czj  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $Gb] K{e  
} .+3= H@8h  
|+Z, 7~!  
  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: Ms5m.lX  
6U;pYWht  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7|3Qcn7P)@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jR7 , b5  
<N"t[N70;  
  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: p D!IB`cA4  
{<~0nLyJS  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }J .f 5WaG  
{ a,o)i8G9R<  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) KN U/Kc#  
 { U#G[#sd> K  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 A0.) =q  
  SaveBmp(); j"o`K}C  
  return FALSE; J 2%^%5&0  
 } dDN#>|  
 …… //其它处理及默认处理 +7?p& -r)x  
} 2<}^m/}  
q[{q3-W  
-e#YWMo(  
  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。 B e+'&+  
e#Jx|Ej=  
  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。 #.p^ S0\pw  
a9z|ef  
  二、编程步骤 3/8o)9f.  
DQW^;Ls  
  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"; u`Djle  
VKy:e.  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ";B.^pBv@;  
6N(Wv0b $  
  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; ]g-(|X~>  
#M*h)/d[A  
  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; f XxdOn.  
|33pf7o  
  5、 添加代码,编译运行程序。 j>~^jz:  
,p\^n`A32  
三、程序代码 Z!=/[,b  
pH.wCD:1n  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 6}mbj=E`  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) " |RP_v2  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ P(G$@},W  
#if _MSC_VER > 1000 r AMnM>`  
#pragma once jPYed@[+  
#endif // _MSC_VER > 1000 ?H1I,]Di  
#ifndef __AFXWIN_H__ h!56?4,%Y  
#error include 'stdafx.h' before including this file for PCH Gxv@a   
#endif e:{v.C0ez  
#include "resource.h" // main symbols .$)'7  
class CHookApp : public CWinApp #C,M8~Q7  
{ =]E(iR_&  
 public: I=l() ET=  
  CHookApp(); g[Ah> 5  
  // Overrides ;[WW,,!Y  
  // ClassWizard generated virtual function overrides e/lfT?J\  
  //{{AFX_VIRTUAL(CHookApp) '1;Q'-/J  
 public: {U(-cdU{e`  
  virtual BOOL InitInstance(); r=4'6!  
  virtual int ExitInstance(); t/WauY2JUC  
  //}}AFX_VIRTUAL "L.)ML  
  //{{AFX_MSG(CHookApp) h8 >7si  
  // NOTE - the ClassWizard will add and remove member functions here. u7G@VZ Ux5  
  // DO NOT EDIT what you see in these blocks of generated code !  'vj45b  
  //}}AFX_MSG L?&+*|VxI  
  DECLARE_MESSAGE_MAP() .Tt \U  
}; kH d_q.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); O_0|Q@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :bwdEni1P  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {g\Yy(r  
BOOL InitHotkey(); sLK J<=0i  
BOOL UnInit(); Gm^@lWzG  
#endif EU]{S=T  
=[(1u|H 9  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. X;flA*6V  
#include "stdafx.h" /pgfa-<  
#include "hook.h" GdEkA  
#include <windowsx.h> t5N@ z  
#ifdef _DEBUG 84)$ CA+NX  
#define new DEBUG_NEW 3v;o`Em&  
#undef THIS_FILE ??12 J#  
static char THIS_FILE[] = __FILE__; ~\4l*$3(^  
#endif zkn K2e,$  
#define MAX_KEY 100 AuUT 'E@E  
#define CTRLBIT 0x04 w_pEup\`  
#define ALTBIT 0x02 4>>{}c!nf  
#define SHIFTBIT 0x01 '|&}rLr:+  
#pragma data_seg("shareddata") K+Q81<X~  
HHOOK hHook =NULL; UBqA[9  
UINT nHookCount =0; hLGUkG?6G  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey kt%9PGw  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT <(`dU&&%"}  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey )5gcLD/zI  
static int KeyCount =0; |\@e  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ?{%P9I  
#pragma data_seg() meu\jg  
HINSTANCE hins; "RuJlp  
void VerifyWindow(); i;lzFu )G  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) fJLlz$H  
//{{AFX_MSG_MAP(CHookApp) -(~Tu>KaH  
// NOTE - the ClassWizard will add and remove mapping macros here. l"o@.C} f/  
// DO NOT EDIT what you see in these blocks of generated code! QKc3Q5)@j  
//}}AFX_MSG_MAP 6=A2Y:8  
END_MESSAGE_MAP() }M?GqA=  
!1+L0,I6  
CHookApp::CHookApp() 2,puu2F  
{ Z!G_" 3  
 // TODO: add construction code here, r J ?Y~Q  
 // Place all significant initialization in InitInstance mm/U9hbp%  
} I? dh"*Js&  
-VD[iH  
CHookApp theApp; xb0hJ~e  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^tsIgK^9H  
{ *!%y.$\cE  
 BOOL bProcessed=FALSE; K6~N{:.s  
 if(HC_ACTION==nCode) ??=CAU%\  
 { /ivt8Uiw  
  if((lParam&0xc0000000)==0xc0000000){// Key up #9EpQc[4  
   switch(wParam) GV6!`@<  
   { W*;~(hDz  
    case VK_MENU: 'IP'g,o++  
     MaskBits&=~ALTBIT; NZ9=hI;iM  
     break; ;j=/2vU~@  
    case VK_CONTROL: '@2pOq  
     MaskBits&=~CTRLBIT; 5[`!\vCiZ  
     break; \6)l(b;  
    case VK_SHIFT: 5fv eQI~!  
     MaskBits&=~SHIFTBIT; g[*+R9'  
     break; #tN)OZA  
    default: //judge the key and send message QX ishHk&  
     break; jC ,foqL  
   } wfM$JYfI  
   for(int index=0;index<MAX_KEY;index++){ @!'Pr$`  
    if(hCallWnd[index]==NULL) c_}i(HQ  
     continue; rOyK==8/Fg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) IGEf*!  
    { 8wwqV{O7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Yfk[mo  
     bProcessed=TRUE; af\>+7x93  
    } ;5=J'8f  
   } "uN JQ0Y  
  } LT!B]y  
  else if((lParam&0xc000ffff)==1){ //Key down 7A8jnq7m/  
   switch(wParam) LkMhS0?(T  
   { mj[PKEdkB  
    case VK_MENU: !EF~I8d\]  
     MaskBits|=ALTBIT; go m< V?$  
     break; Dk&cIZ43  
    case VK_CONTROL: gZ   
     MaskBits|=CTRLBIT; x%B^hH;W  
     break; ~Lhq7;=H?O  
    case VK_SHIFT: =DvFY]9{  
     MaskBits|=SHIFTBIT; dl'pl  
     break; Me yQ`%  
    default: //judge the key and send message vi4u `  
     break; 6/hY[a!  
   } i&-g 0  
   for(int index=0;index<MAX_KEY;index++) n*CH,fih:  
   { {#: js  
    if(hCallWnd[index]==NULL) upQ:C>S  
     continue; PH9MB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qCSJ=T;  
    { =`xk|86f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); iN0pYqY*  
     bProcessed=TRUE; ?}m/Q"!1  
    } <?&GBCe  
   } Tc,Bv7:  
  } ;i^p6b j  
  if(!bProcessed){ T.<er iv  
   for(int index=0;index<MAX_KEY;index++){ 49nZWv48"_  
    if(hCallWnd[index]==NULL) Zn1+} Z@I  
     continue; kwMuL>5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ,E3"Ai sI  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {r`l  
   } S9 <J \`FG  
  } \U4O*lq  
 } A@j;H|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Um)0jT  
} N)lzX X  
w}G2m)(  
BOOL InitHotkey() 6%JKY+n^  
{ (Z=ziopDE  
 if(hHook!=NULL){ M]!R}<]{  
  nHookCount++; |]RV[S3v  
  return TRUE; /gL(40  
 } v{i'o4  
 else !(*mcYA*W  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); x|_%R v  
  if(hHook!=NULL) zPe4WE|  
   nHookCount++; /[VafR!  
  return (hHook!=NULL); (BVLlOo?J  
} P.gk'\<k  
BOOL UnInit() 'C1=(PE%`  
{ ~&CaC  
 if(nHookCount>1){ 3Ku!;uo!u  
  nHookCount--; K0@2>nR  
  return TRUE; G`ZpFg0Y  
 } @(JcM=  
 BOOL unhooked = UnhookWindowsHookEx(hHook); n }7DL8  
 if(unhooked==TRUE){ VFT G3,kI  
  nHookCount=0; +&jWM-T"-  
  hHook=NULL; R<Ojaj=V  
 } H;k;%Zg;  
 return unhooked; ;/N[tO?Q  
} <t,uj.9_  
 LS,/EGJ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3q R@$pm  
{ MxuwEV|^  
 BOOL bAdded=FALSE; S59!+V  
 for(int index=0;index<MAX_KEY;index++){ U/>f" F  
  if(hCallWnd[index]==0){ T[N:X0  
   hCallWnd[index]=hWnd; o\@1\#a  
   HotKey[index]=cKey; 9<k<HmkD  
   HotKeyMask[index]=cMask; j?i Ur2  
   bAdded=TRUE; 8JAA?0L"'  
   KeyCount++; $^.LZ1Jd  
   break; o*:VG\#Z6  
  } Mlb=,l  
 } FAjO-T4(  
 return bAdded; 30*^ERO  
} 9U>ID{  
LG [ 2u  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5~<> h~yJ  
{ )-Zpr1kD  
 BOOL bRemoved=FALSE; 6TbDno/!'  
 for(int index=0;index<MAX_KEY;index++){ F@kOj*5,[  
  if(hCallWnd[index]==hWnd){ fGcAkEstT!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ d@b0z$<s  
    hCallWnd[index]=NULL; tE]g*]o  
    HotKey[index]=0; <]b}R;9v  
    HotKeyMask[index]=0; j?jEWreq]~  
    bRemoved=TRUE; ?g}n$%*5y!  
    KeyCount--; 4};!nYey!  
    break; : :uD%a zd  
   }  @es}bKP  
  } /"- k ;jz  
 } vz) A~"E  
 return bRemoved; = PqQJE}  
} gd_w;{WP  
q#pBlJ.LK  
void VerifyWindow() ?Mp~^sgp'  
{ !3DWz6u  
 for(int i=0;i<MAX_KEY;i++){ U; ?%rM6  
  if(hCallWnd!=NULL){ qDqIy+WR  
   if(!IsWindow(hCallWnd)){ b+'G^!JR  
    hCallWnd=NULL; qlIC{:E0  
    HotKey=0; G&0&*mp  
    HotKeyMask=0; Yi{[llru  
    KeyCount--; $G"PZ7  
   } 9;&2LT7z  
  } P0Ds7xh]h  
 } ;8 JJ#ED  
} D2[wv+#)  
82~UI'f \  
BOOL CHookApp::InitInstance() vPR1 TMi>  
{ MfJk`-%~  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Xf:CGR8_  
 hins=AfxGetInstanceHandle(); mbsdiab#N  
 InitHotkey(); ^v}Z5,aN  
 return CWinApp::InitInstance(); j$Vv'on  
} C0jmjZ%w@  
uwj/]#`  
int CHookApp::ExitInstance() wHBkaPO!  
{ a { L`C"rJ  
 VerifyWindow();  uw LT$  
 UnInit(); Y` LZ/Tgk  
 return CWinApp::ExitInstance(); ~{n_rKYV  
} %+w>`k3(N  
req=w;E:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?f1%)]>   
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) H#E   
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 6ApW+/  
#if _MSC_VER > 1000 [NFg9y;{h  
#pragma once ;} gvBI2e  
#endif // _MSC_VER > 1000 ""^9WLH4g-  
$ &qB,>5=X  
class CCaptureDlg : public CDialog lT@5=ou[  
{ @?aNvWeavH  
 // Construction x]euNa  
 public: Eof1sTpA  
  BOOL bTray; 2K.. ;A$  
  BOOL bRegistered; #v:<\-MjN  
  BOOL RegisterHotkey(); Bt Bo%t&  
  UCHAR cKey; }1`Rq?@J  
  UCHAR cMask; l'&l!D&   
  void DeleteIcon();  )"&-vg<  
  void AddIcon(); ?p. dc ~tZ  
  UINT nCount; .'lc[iI9)d  
  void SaveBmp(); Bo`fy/x#  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor go]d+lhFB  
  // Dialog Data |^S[Gr w  
  //{{AFX_DATA(CCaptureDlg) gET& +M   
  enum { IDD = IDD_CAPTURE_DIALOG }; !__f  
  CComboBox m_Key; Umv_{n`  
  BOOL m_bControl; 3HO 4 h\mp  
  BOOL m_bAlt; S5" xb  
  BOOL m_bShift; u4IgPCTZ+  
  CString m_Path; +=$\7z>s  
  CString m_Number; 56G5JSB=\  
  //}}AFX_DATA %;yo\  
  // ClassWizard generated virtual function overrides v%/8pmZw;  
  //{{AFX_VIRTUAL(CCaptureDlg) jn^i4f>N  
 public: Q&MZ/Nnf  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 6aM`qz)  
 protected: lDe9EJR  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #Q^mdv?  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); PP.k>zsx  
  //}}AFX_VIRTUAL [_|i W%<`  
  // Implementation A{>]M@QC2  
 protected: izY,t!  
  HICON m_hIcon; f4/!iiS}r  
  // Generated message map functions ;)83tx /  
  //{{AFX_MSG(CCaptureDlg) 3Nr8H.u&q  
  virtual BOOL OnInitDialog(); ~NpnRIt  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); n j; KnZ  
  afx_msg void OnPaint(); plsf` a  
  afx_msg HCURSOR OnQueryDragIcon(); b=F"  
  virtual void OnCancel(); A!Ng@r  
  afx_msg void OnAbout(); vD:.1,72  
  afx_msg void OnBrowse(); YCh!D dy  
  afx_msg void OnChange(); 9`{Mq9J  
 //}}AFX_MSG J0@m Ol  
 DECLARE_MESSAGE_MAP() +O j28vR  
}; xO/44D  
#endif U(3LeS;mr  
0K7-i+\#  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file h6)hZ'zV  
#include "stdafx.h" qlPjz*<h"H  
#include "Capture.h" r;O{et't7y  
#include "CaptureDlg.h" R j(="+SPj  
#include <windowsx.h> y|.wL=;  
#pragma comment(lib,"hook.lib") .NCQiQ  
#ifdef _DEBUG aZ5qq+1x  
#define new DEBUG_NEW E Q?4?  
#undef THIS_FILE 7; T S  
static char THIS_FILE[] = __FILE__; mTZlrkT  
#endif 6jCg7Su]  
#define IDM_SHELL WM_USER+1 ;NRm ,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Jfo|/JQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dXe763~<  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; g\rujxHlH  
class CAboutDlg : public CDialog PA`b~Ct  
{ *fSa8CV  
 public: }9Y='+.%^  
  CAboutDlg(); ~`*:E'/5k]  
  // Dialog Data F:hJ^:BP  
  //{{AFX_DATA(CAboutDlg) 6XFO@c}d  
  enum { IDD = IDD_ABOUTBOX }; dMRwQejY{7  
  //}}AFX_DATA 8 Sl[&  
  // ClassWizard generated virtual function overrides 0<nKB}9  
  //{{AFX_VIRTUAL(CAboutDlg) YX^{lD1Jj  
 protected: q/Q^\HTk  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xS,):R  
  //}}AFX_VIRTUAL d@C ;rzR  
  // Implementation ZJy D/9y  
 protected: dH?pQ   
  //{{AFX_MSG(CAboutDlg) uBl&|yvxB  
  //}}AFX_MSG b.YQN'  
  DECLARE_MESSAGE_MAP() k^R>xV  
}; ot_jG)  
kZUuRB~om  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @VxBURZ?  
{ DgClN:Hw  
 //{{AFX_DATA_INIT(CAboutDlg) HeSnj-mtr}  
 //}}AFX_DATA_INIT 7T4rx53  
} i;/qJKr&#  
&+&^Hc  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) =xG9a_^v  
{ s15f <sp  
 CDialog::DoDataExchange(pDX); H#w?$?nIWu  
 //{{AFX_DATA_MAP(CAboutDlg) KgAc0pz{7H  
 //}}AFX_DATA_MAP (c(?s`;  
} Kh$L~4l  
dr'6N1B@  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?ZTB u[  
 //{{AFX_MSG_MAP(CAboutDlg) 27u$VHwb  
 // No message handlers `f6Qd2\  
 //}}AFX_MSG_MAP dE ^(KBF  
END_MESSAGE_MAP() pKr3(5~  
JXPn <  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) @ o;m!CYB  
: CDialog(CCaptureDlg::IDD, pParent) >x!N@G  
{ (&njZdcb*  
 //{{AFX_DATA_INIT(CCaptureDlg) ;GH(A=}/Y  
  m_bControl = FALSE; 6|_ S|N  
  m_bAlt = FALSE; V#3VRh  
  m_bShift = FALSE; ;`F0 %0d  
  m_Path = _T("c:\\"); R L)'m  
  m_Number = _T("0 picture captured."); ) }?dYk  
  nCount=0; !my5-f>{(  
  bRegistered=FALSE; laFkOQI  
  bTray=FALSE; ?#FA a,  
 //}}AFX_DATA_INIT ^e&,<+qY  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 jg%D G2  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); G1| Tu"  
} l#Qf8*0  
}$$b6G  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) @B&hR} 4  
{  ISq^V  
 CDialog::DoDataExchange(pDX); ]'M4Unu#@  
 //{{AFX_DATA_MAP(CCaptureDlg) =#y&xWxL  
  DDX_Control(pDX, IDC_KEY, m_Key); ]}'WNy6c&x  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); EEkO[J[=  
  DDX_Check(pDX, IDC_ALT, m_bAlt); PN\2 ^@>_  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); j$8 ~M  
  DDX_Text(pDX, IDC_PATH, m_Path); NugJjd56x  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 4pc=MR  
 //}}AFX_DATA_MAP *YtITyDS3>  
} 0 _&oMPY  
[X~H Uk??  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 4<LRa=XT$  
//{{AFX_MSG_MAP(CCaptureDlg) kkzXv`+  
 ON_WM_SYSCOMMAND() JVXBm]  
 ON_WM_PAINT() jkD5Z`D  
 ON_WM_QUERYDRAGICON() g|nPr)<  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) $1?YVA7  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 7 51\K`L  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Ge97e/ CY  
//}}AFX_MSG_MAP /CX<k gz@  
END_MESSAGE_MAP() j?.VJ^Ff/u  
c*ytUI *  
BOOL CCaptureDlg::OnInitDialog() >6rPDzW`Dx  
{ HX<5i>]0\u  
 CDialog::OnInitDialog(); !).D  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9$)4C|  
 ASSERT(IDM_ABOUTBOX < 0xF000); 7J 0!v q  
 CMenu* pSysMenu = GetSystemMenu(FALSE); TF{ xFb)  
 if (pSysMenu != NULL) d[O.UzQ  
 { =Wl CE_  
  CString strAboutMenu; 0} {QQB  
  strAboutMenu.LoadString(IDS_ABOUTBOX); H:~LL0Md%  
  if (!strAboutMenu.IsEmpty()) hPEK@  
  { M rVtxzH  
   pSysMenu->AppendMenu(MF_SEPARATOR); fY-{,+ `'  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); &}P62&  
  } 5gEUE{S  
 } !hJKI.XH  
 SetIcon(m_hIcon, TRUE); // Set big icon ,:;_j<g`e  
 SetIcon(m_hIcon, FALSE); // Set small icon xQ$*K]VP  
 m_Key.SetCurSel(0); v"bOv"!al  
 RegisterHotkey(); yWX:`*GV  
 CMenu* pMenu=GetSystemMenu(FALSE); ^M,Q<HL  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); g4-HUc zk  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7v=Nh  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); /yH:ur  
 return TRUE; // return TRUE unless you set the focus to a control 4!E6|N%f  
} . e]!i(5I  
3S <5s}  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `FmI?:Cv  
{ 6BMRl%3>Z  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) T4Zp5m")  
 { yfaXScbE  
  CAboutDlg dlgAbout; UUA7m$F1  
  dlgAbout.DoModal(); J#JZ^59lOS  
 } AQ-PY  
 else IcaF 4#  
 {  ,?`$ ~8  
  CDialog::OnSysCommand(nID, lParam); .CmwR$u&  
 } .Mm8\].  
} ?)JW}3<.  
2^Y1S?g.  
void CCaptureDlg::OnPaint() 'rz*mR8  
{ #X|'RL($  
 if (IsIconic()) @AWKEo<7.I  
 { n:;2Z  
  CPaintDC dc(this); // device context for painting ZT|E1[Q  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ~+4OG 0  
  // Center icon in client rectangle r5rK>  
  int cxIcon = GetSystemMetrics(SM_CXICON); }_Jai4O  
  int cyIcon = GetSystemMetrics(SM_CYICON); Ig S.U  
  CRect rect; O":x$>'t  
  GetClientRect(&rect); :~`E @`/  
  int x = (rect.Width() - cxIcon + 1) / 2;  LqU]&AAh  
  int y = (rect.Height() - cyIcon + 1) / 2; +F`! Jt  
  // Draw the icon 9ft7  
  dc.DrawIcon(x, y, m_hIcon); *^QfTKN   
 } g*!2.P  
 else ,V |>nkQ  
 { pU}>}  
  CDialog::OnPaint(); -3bl !9h^  
 } K uFDkT!  
} Grkj @Q*  
+[D=2&tmk  
HCURSOR CCaptureDlg::OnQueryDragIcon() K);:+s-  
{  "X}!j>-  
 return (HCURSOR) m_hIcon; UWmWouA  
} {?#g*QF|^  
.F> c Z,  
void CCaptureDlg::OnCancel() fr:RiOPn  
{ Yuh t<:`  
 if(bTray) 5 {'%trDEy  
  DeleteIcon(); y 37n~~%  
  CDialog::OnCancel(); ]D(%Ku,O%  
} DBVe69/S  
@(oz`|*  
void CCaptureDlg::OnAbout() l |\Q~ D!o  
{ _DH,$evS%  
 CAboutDlg dlg; R]L 7?=  
 dlg.DoModal(); I~#'76L[  
} hOw7"'# !  
[x,_0-_  
void CCaptureDlg::OnBrowse() aS62S9nwX  
{ nq A> }A  
 CString str; Xgop1  
 BROWSEINFO bi; +vJ[k2d  
 char name[MAX_PATH]; -l$]>J~  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); -pcYhLIn  
 bi.hwndOwner=GetSafeHwnd(); !3d +"tL S  
 bi.pszDisplayName=name; a o\+%s  
 bi.lpszTitle="Select folder"; x|E$ f+  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; J/ <[irC  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); E!jM&\Zj  
 if(idl==NULL) H|Q)Tp Lk  
  return; |A}E/=HPU  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); pSc<3OI  
 str.ReleaseBuffer(); !`Bb[BTf  
 m_Path=str; !.x(lOqf  
 if(str.GetAt(str.GetLength()-1)!='\\') %mh K1,  
  m_Path+="\\"; fWF\ V[  
 UpdateData(FALSE); Q9?/)&3Bu  
} A1Rt  
:`oYD  
void CCaptureDlg::SaveBmp() +9,"ne1'e  
{ 0xZq?9a  
 CDC dc; S9-K  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); E^Q|v45d  
 CBitmap bm;  |o=eS&)  
 int Width=GetSystemMetrics(SM_CXSCREEN); W=]QTx,J  
 int Height=GetSystemMetrics(SM_CYSCREEN); G^j/8e  
 bm.CreateCompatibleBitmap(&dc,Width,Height); bL{wCo-Y  
 CDC tdc; -F@Rpfrj_#  
 tdc.CreateCompatibleDC(&dc); YVqhX]/   
 CBitmap*pOld=tdc.SelectObject(&bm); }B}?qV  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); z8jQaI]j  
 tdc.SelectObject(pOld); tAc[r)xFw  
 BITMAP btm; ZuILDevMD  
 bm.GetBitmap(&btm); C$ nT&06o  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; F8>Fp"  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); c,4UnEoCR  
 BITMAPINFOHEADER bih; EC&w9:R  
 bih.biBitCount=btm.bmBitsPixel; uiM*!ge  
 bih.biClrImportant=0; rhwY5FD?  
 bih.biClrUsed=0; d%5QEVV  
 bih.biCompression=0; (&+ ~hW5d  
 bih.biHeight=btm.bmHeight; gmy_ZVU'  
 bih.biPlanes=1; Y <Ta2H  
 bih.biSize=sizeof(BITMAPINFOHEADER); [ gx<7}[  
 bih.biSizeImage=size; Yb 6(KT  
 bih.biWidth=btm.bmWidth; M|6 W<y  
 bih.biXPelsPerMeter=0; gx@b|rj;  
 bih.biYPelsPerMeter=0; jA<v<oV  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ZrXvR`bsw  
 static int filecount=0; Ah) _mxK  
 CString name; .B_) w:oF  
 name.Format("pict%04d.bmp",filecount++); vR-rCve$P  
 name=m_Path+name; l 0jjLqm:  
 BITMAPFILEHEADER bfh; Y(W>([59  
 bfh.bfReserved1=bfh.bfReserved2=0; RY&Wvkjh  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ;' YM@n  
 bfh.bfSize=54+size; ZGe+w](  
 bfh.bfOffBits=54; 4E&URl0Bh  
 CFile bf; ?VO*s-G:J  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 7AHEzJh"  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); oq(um:m  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); asmMl9)(`  
  bf.WriteHuge(lpData,size); "JKrbgN@;L  
  bf.Close(); vw>O;u.]B  
  nCount++; M($dh9A_  
 } v8Bi1,g  
 GlobalFreePtr(lpData); D />REC^  
 if(nCount==1) K zKHC  
  m_Number.Format("%d picture captured.",nCount); b.Z K1  
 else HG5|h[4Gt  
  m_Number.Format("%d pictures captured.",nCount); 0:Yz'k5  
  UpdateData(FALSE); c7L#f=Ot?  
} >}43MxU?  
V[uB0#Lp  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) %}x/ fq  
{  r,!7TuBl  
 if(pMsg -> message == WM_KEYDOWN) c+ Ejah+  
 { -Q<3Q_  
  if(pMsg -> wParam == VK_ESCAPE) ]?/[& PP,  
   return TRUE; G! L=W#{  
  if(pMsg -> wParam == VK_RETURN)  #/MUiV  
   return TRUE; 8s6[?=nM  
 } o_vK4%y(  
 return CDialog::PreTranslateMessage(pMsg); wVP{R3  
} <dLdSEw  
+\?#8U/k  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) z2A7:[  
{ n!~{4 uUW  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){  9 k)?-  
  SaveBmp(); oslV@v F  
  return FALSE; )g(2xUk-y  
} 0bzD-K4WVd  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ -r_z,h|  
 CMenu pop; 5E+l5M*(  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); c<r`E  
 CMenu*pMenu=pop.GetSubMenu(0); v%VCFJ  
 pMenu->SetDefaultItem(ID_EXITICON); VSc;}LH  
 CPoint pt; B=JeZMn  
 GetCursorPos(&pt); `7LN?- T  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Z; r}G m  
 if(id==ID_EXITICON) GCkc[]2p  
  DeleteIcon(); sX^m1v~N|  
 else if(id==ID_EXIT) RYZh"1S;k  
  OnCancel(); v1 d]  
 return FALSE; K%Vl:2#F  
} ICTl{|i ]  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); TWK(vEDM  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ZUVk~X3  
 AddIcon(); L*6Tz'Qp  
 return res; W+Z] Y  
} Z6 E-FuO  
Ha)eeE$  
void CCaptureDlg::AddIcon() (B.J8`h }  
{ vA10'Gx'  
 NOTIFYICONDATA data; b6 &`]O;%  
 data.cbSize=sizeof(NOTIFYICONDATA); W1w)SS  
 CString tip; 24}r;=U  
 tip.LoadString(IDS_ICONTIP); gxycw4kz  
 data.hIcon=GetIcon(0); Sx5r u?$.  
 data.hWnd=GetSafeHwnd(); !E'jd72O  
 strcpy(data.szTip,tip); _1VtVfiZ{  
 data.uCallbackMessage=IDM_SHELL; fpwge/w  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; rgWGe6;!  
 data.uID=98; CD:@OI  
 Shell_NotifyIcon(NIM_ADD,&data); X8~ cWW  
 ShowWindow(SW_HIDE); dBE :rZu  
 bTray=TRUE; ,ic.b @u1  
} )wQR2$x~  
~^2Y*|{)  
void CCaptureDlg::DeleteIcon() ~N&j6wHg#  
{ }b ~;x6  
 NOTIFYICONDATA data; MW=2GhD=  
 data.cbSize=sizeof(NOTIFYICONDATA); \(R(S!xr_  
 data.hWnd=GetSafeHwnd(); DI'wZySS^  
 data.uID=98; Ratg!l|'-  
 Shell_NotifyIcon(NIM_DELETE,&data); 8j. 9Sk/  
 ShowWindow(SW_SHOW); hub1rY|No  
 SetForegroundWindow(); Mf^ ;('~  
 ShowWindow(SW_SHOWNORMAL); 40<ifz[7  
 bTray=FALSE; /0>Cy\eN0  
} MoIVval/  
RAxAy{  
void CCaptureDlg::OnChange() CTv-$7#  
{ [RiCa  
 RegisterHotkey(); B8NOPbT  
} #G:~6^A  
2VyLt=mdh  
BOOL CCaptureDlg::RegisterHotkey() s(q\!\FS  
{ V/j+Z1ZW  
 UpdateData(); 7z9gsi  
 UCHAR mask=0; R;,+0r^i  
 UCHAR key=0; }rz}>((ZHF  
 if(m_bControl) yHT8I  
  mask|=4; @]" :3  
 if(m_bAlt) US 9cuah1/  
  mask|=2; &EYO[~D06  
 if(m_bShift) m/r4f279  
  mask|=1; Dtl381F J  
  key=Key_Table[m_Key.GetCurSel()]; }A'QXtI/G  
 if(bRegistered){ 5 5>^H1M  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); @[D-2s  
  bRegistered=FALSE; eVL'Ao&Ho  
 } M]oO1GM  
 cMask=mask; 3de<H=H'  
 cKey=key; +]*4!4MK6  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); BX;Z t9"*  
 return bRegistered; id8a#&t]  
} nyD(G=Q5  
BY.' 0,H=k  
  四、小结 #lRkp.e  
)=V0  
  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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