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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: <?QY\wyikz  
  fq _6xs  
  一、实现方法 ^uC1\!Q1  
ZA+$ZU^  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: J?u",a]|H"  
<#LH L  
#pragma data_seg("shareddata") 5"k _Ms7R,  
HHOOK hHook =NULL; //钩子句柄 vY6eg IO  
UINT nHookCount =0; //挂接的程序数目 ;?bRRW  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 *p p1U>,  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 eQJLyeR+  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey R7( + ^%  
static int KeyCount =0; lB.P   
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 U*1rA/"n  
#pragma data_seg() r B)m{)  
'GS1"rkW<5  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 A\k@9w\Ll;  
% ;09J  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 8kX3.X`  
%TvunV7NQS  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR @D Qg1|m  
cKey,UCHAR cMask) hekAics6S  
{ ngn%"xYX  
 BOOL bAdded=FALSE; +u:8#!X$RD  
 for(int index=0;index<MAX_KEY;index++){ )%f]`<o  
  if(hCallWnd[index]==0){ DTsc&.29^  
   hCallWnd[index]=hWnd; ;"wU+  
   HotKey[index]=cKey; p~$\@8@  
   HotKeyMask[index]=cMask; p~DlZk"  
   bAdded=TRUE; -9\O$I-3  
   KeyCount++; 9T`xW]Zf  
   break; 'P39^rb  
  } q$0^U{j/  
 } iMYvCw/t6  
 return bAdded; ,bKA]#(2  
} ,`B*rCOa  
//删除热键 ')}$v+9h  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;Hv#SRSz  
{  >pT92VN  
 BOOL bRemoved=FALSE; ` L6H2:pf  
 for(int index=0;index<MAX_KEY;index++){ ^7vh ize  
  if(hCallWnd[index]==hWnd){ rmk'{"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ R1\cAP^ 0  
    hCallWnd[index]=NULL; Y:ZI9JK?  
    HotKey[index]=0; X_ !Sm  
    HotKeyMask[index]=0; ;xXHSxa:=W  
    bRemoved=TRUE; b8feo'4Z   
    KeyCount--; #AFr@n  
    break; 0+m"eGwTm  
   } (<=qW_iW  
  } lD _  u  
 } gU0}.b  
 return bRemoved; p%G4Js.  
} #sq-V,8  
{y)s85:t  
Bm;{dO  
  DLL中的钩子函数如下: XGk8Ki3w  
^4`q%_vm  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) EAqTXB@XU  
{ vFV->/u  
 BOOL bProcessed=FALSE; !c\s)&U7B  
 if(HC_ACTION==nCode) PQlG !  
 { n)8bkcZCp+  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 vWXj6}  
   switch(wParam) sO~N2  
   {  1W "9u   
    case VK_MENU: JU1U=Lu."  
     MaskBits&=~ALTBIT; _Oh;._PS  
     break; _|g(BK2}  
    case VK_CONTROL: Xa Yx avq  
     MaskBits&=~CTRLBIT; >OBuHqC  
     break; U3&*,xeU@H  
    case VK_SHIFT: 4;7<)&#h  
     MaskBits&=~SHIFTBIT; /1gKc}rB2  
     break;  7=6p  
    default: //judge the key and send message ec)G~?FH  
     break; I,l%6oPa  
   } \4bma<~a  
   for(int index=0;index<MAX_KEY;index++){ 0 jVuF l  
    if(hCallWnd[index]==NULL) ?k<wI)JR  
     continue; Q{0-pHr}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ZL+{?1&-  
    { F C2oP,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); J<H$B +;qR  
     bProcessed=TRUE; m Wsegq4  
    } 1x V~EX  
   } B@63=a*kG  
  } :2 n5;fp  
  else if((lParam&0xc000ffff)==1){ //有键按下 [64K?l0&  
   switch(wParam) C;OU2,c,T  
   { tv,^ Q}  
    case VK_MENU: vpMNulXb,  
     MaskBits|=ALTBIT; H2zd@l:R  
     break; Km 'd=B>Jy  
    case VK_CONTROL: VjMd&>G  
     MaskBits|=CTRLBIT; fFqK.^Tn  
     break; .]k(7F!W  
    case VK_SHIFT: %Jq(,u  
     MaskBits|=SHIFTBIT; Ad+-/hxc  
     break; bsR^H5O@  
    default: //judge the key and send message VVYQIR]!yk  
     break; @433?g`2b  
   } @j9yc  
   for(int index=0;index<MAX_KEY;index++){ Z@RAdwjR`p  
    if(hCallWnd[index]==NULL) 'lHtz ~[  
     continue; :{E3H3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Fu^^Jex  
    { aEy_H-6f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); %&V<kH"7Q{  
     bProcessed=TRUE; A&Ut:OiA  
    } __-rP  
   } #ie{!Mh  
  } Y\%R6/Gj|u  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ^r(2 r  
   for(int index=0;index<MAX_KEY;index++){ LZX-am`%  
    if(hCallWnd[index]==NULL) V}'|a<8kVv  
     continue; ?:lOn(0&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *O$kF.3q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); @>ONp|}@qI  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 IgLP=mqcWK  
   } qusgX;)  
  } BaR9X ?~O$  
 } ,Uc\ Ajx  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); q~;P^i<Y  
} @Ys(j$U't  
TAi |]U!  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: wAVO%8u  
:kOLiko!4>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); oMkB!s  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?Xlmt$Jp  
rw ^^12)  
  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: :uu\q7@'  
1k-^LdDj  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) nm*1JA.:  
{ 7V 2%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6i9m!YQV  
 { mu=u!by.E  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 o-("S|A-  
  SaveBmp(); Lyt6DvAp"  
  return FALSE; XFG]%y=/6  
 } \%mR*J+  
 …… //其它处理及默认处理 ]m=* =LLC  
} nO\|43W  
r\'3q '7p  
7EI(7:gOn  
  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。 @wl80v  
+M-' K19  
  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。 +ulX(u(,  
IN , @  
  二、编程步骤 X.j#??  
~ W52Mbf  
  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"; 0aQNdi)b  
a_x$I? ,  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; I]~xs0$4#  
rv9qF |2r{  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; sOz jViv  
"h2;65@  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 6Ck?O/^  
dK|MQ <  
  5、 添加代码,编译运行程序。 [0m'a\YE9  
o:f=dBmoX  
三、程序代码 7M3q|7 ?  
v srce  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL jMW|B  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 87YT;Z;U&  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ?rk3oa-  
#if _MSC_VER > 1000 unSF;S<  
#pragma once Q\m"n^XN  
#endif // _MSC_VER > 1000 5NJ@mm{0  
#ifndef __AFXWIN_H__ E36<Wog  
#error include 'stdafx.h' before including this file for PCH ugVsp&i#  
#endif w{I60|C]*  
#include "resource.h" // main symbols Q]{DhDz ?+  
class CHookApp : public CWinApp 7yeZ+lD  
{ iMk`t:!;#"  
 public: k8Qv>z  
  CHookApp(); va~:oA  
  // Overrides _~HGMC)  
  // ClassWizard generated virtual function overrides `z Z=#p/  
  //{{AFX_VIRTUAL(CHookApp) e%wbUr]c2  
 public: [EB2o.E sO  
  virtual BOOL InitInstance(); B?#@<2*=L  
  virtual int ExitInstance(); v@Otp  
  //}}AFX_VIRTUAL )K8JDP  
  //{{AFX_MSG(CHookApp) ir \d8.  
  // NOTE - the ClassWizard will add and remove member functions here. 3j]La  
  // DO NOT EDIT what you see in these blocks of generated code ! P)(Ly5$*  
  //}}AFX_MSG D;BFl(l  
  DECLARE_MESSAGE_MAP() kki]6_/n  
}; C UlANd"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); T/-PSfbkj  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); o"7,CQye  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :3Ty%W&&  
BOOL InitHotkey(); {D1=TTr^  
BOOL UnInit(); B 8C3LP}?  
#endif {7Dc(gNS  
i T 4H@  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ndF Kw  
#include "stdafx.h" !%T@DT=l&  
#include "hook.h" fCx~K'UWn  
#include <windowsx.h> H# 2'\0u  
#ifdef _DEBUG 9 r+' o#  
#define new DEBUG_NEW dkG-Yz~  
#undef THIS_FILE ,i>5\Yl%  
static char THIS_FILE[] = __FILE__; U~Uxs\0:  
#endif luat1#~J  
#define MAX_KEY 100 BIw9@.99B-  
#define CTRLBIT 0x04 ^~=o?VtBg  
#define ALTBIT 0x02 `.L8<-]W  
#define SHIFTBIT 0x01 4)v\Dc/9i  
#pragma data_seg("shareddata") < g6 [mS  
HHOOK hHook =NULL; KXicy_@DC`  
UINT nHookCount =0; B<8Z?:3YS  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey [#lPT'l  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT DFE?H  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey @@SG0YxZ  
static int KeyCount =0; A' dt WD  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift u^!-Z)W  
#pragma data_seg() &EA4`p  
HINSTANCE hins; )o AK)e  
void VerifyWindow(); 1G{$ B^ f  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Kc{fT^E  
//{{AFX_MSG_MAP(CHookApp) m"H9C-Y  
// NOTE - the ClassWizard will add and remove mapping macros here. Xa9G;J$  
// DO NOT EDIT what you see in these blocks of generated code! +~w '?vNc  
//}}AFX_MSG_MAP Q? W]g%:)  
END_MESSAGE_MAP() ={#r/x  
ApU5,R0  
CHookApp::CHookApp() ,lL0'$k~  
{ 5x=tOR/h  
 // TODO: add construction code here, &S''fxGL  
 // Place all significant initialization in InitInstance al#yc  
} *( D_g!a  
-PEpy3dMY  
CHookApp theApp; 9)l[$X  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >qcir~ &  
{ iCc@N|~  
 BOOL bProcessed=FALSE; PS(LD4mD  
 if(HC_ACTION==nCode) xU67ztS'E'  
 { @-!w,$F)%d  
  if((lParam&0xc0000000)==0xc0000000){// Key up 2)4{  
   switch(wParam) q SCt= eQ  
   { JK[7&C-O  
    case VK_MENU: `(*5yXC  
     MaskBits&=~ALTBIT; a)y8MGx?  
     break; /oe="/y6  
    case VK_CONTROL: b*?="%eE(  
     MaskBits&=~CTRLBIT; sNS! /  
     break; !{Y$5)Xh`]  
    case VK_SHIFT: |_!xA/_U'T  
     MaskBits&=~SHIFTBIT; )|Y"^K%Jm  
     break; 7CrWsQl u  
    default: //judge the key and send message ==UH)o`?8  
     break; 2&Wc4,O!i  
   } 9-}&znLZe  
   for(int index=0;index<MAX_KEY;index++){ /PHktSG  
    if(hCallWnd[index]==NULL) *k=Pk  
     continue; JMO"(?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V , )kw{](  
    { Z{u*vUC&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @kI^6(.  
     bProcessed=TRUE; Jw;J$ u!d  
    } i1|-  
   } ffuV$#  
  } lEQn2+  
  else if((lParam&0xc000ffff)==1){ //Key down @}aK\  
   switch(wParam) $n(@hT>?  
   { S\g8(\u  
    case VK_MENU: ) 1H]a'j  
     MaskBits|=ALTBIT; Q:=s99  
     break; u) fbR  
    case VK_CONTROL:  BX+-KvT  
     MaskBits|=CTRLBIT; i aP+Vab  
     break; %<I0-o  
    case VK_SHIFT: 4y%N(^  
     MaskBits|=SHIFTBIT; mxP{"6  
     break; vV"TTzs!  
    default: //judge the key and send message >UR-37g{p  
     break; "qQU ^FW  
   } aViJ?*  
   for(int index=0;index<MAX_KEY;index++) h1JG^w$ 5  
   { @36^4E>h  
    if(hCallWnd[index]==NULL) M7!&gFv8  
     continue; (w"zI!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $\m=-5 0-  
    { y~p7&^FeR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); F}i rCi47c  
     bProcessed=TRUE; Hsx`P  
    } Z*s/%4On  
   } _3hCu/BV  
  } kTs)u\r.  
  if(!bProcessed){ :~U1JAs$  
   for(int index=0;index<MAX_KEY;index++){ !=k\Rr@qx  
    if(hCallWnd[index]==NULL) F;`of  
     continue; qXP)R/~OZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) &k : |  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ?G.9D`95  
   } wQ(ME7 t  
  } t-_N|iW' 5  
 } nSgg'I(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Y:*mAv;&  
} 9OXrz}8C  
shnfH   
BOOL InitHotkey() OuS{ve  
{ IExQ}I  
 if(hHook!=NULL){ l|j&w[c[Q0  
  nHookCount++; L-G186B$r  
  return TRUE; P{rJG '  
 } * Oyic3F  
 else ^_)CQ%W?  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); EUUj-.dEN  
  if(hHook!=NULL) kc/h]B  
   nHookCount++; .R biF  
  return (hHook!=NULL); &<.Z4GxS  
} mxGvhkj  
BOOL UnInit() o.}^6.h"  
{ &&JI$x0;  
 if(nHookCount>1){ <fs2;  
  nHookCount--; QF[9Zn  
  return TRUE; w&:h^u  
 } E62VuX  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ,7/un8:%c  
 if(unhooked==TRUE){ jwAO{.}T1r  
  nHookCount=0; gh i!4  
  hHook=NULL; B:+}^=  
 } }u:^Mz  
 return unhooked; dpE\eXoa,  
} G?>~w[#mQR  
|FPx8b;#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2tn%/gf'm  
{ BQ_\8Qt|  
 BOOL bAdded=FALSE; 7{az %I$h  
 for(int index=0;index<MAX_KEY;index++){ sy/J+==  
  if(hCallWnd[index]==0){ ][wS}~):  
   hCallWnd[index]=hWnd; AVNB)K"  
   HotKey[index]=cKey; ;@v7AF6Hq  
   HotKeyMask[index]=cMask; *M- .Vor?R  
   bAdded=TRUE; ] p+t>'s  
   KeyCount++; ?vf\_R'M  
   break; as~.XWa  
  } rw_&t>Ri;  
 } '>'h7F=tY  
 return bAdded; a,&Kvh  
} ~LYKt0/W&  
|(XV '-~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) fa5($jJ&  
{ hO{@!H$l  
 BOOL bRemoved=FALSE; bp$8hUNYz-  
 for(int index=0;index<MAX_KEY;index++){ alHwN^GhP  
  if(hCallWnd[index]==hWnd){ o)S>x0| [  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $V`O%Sz  
    hCallWnd[index]=NULL; Ldir'FW  
    HotKey[index]=0; B>a`mFM  
    HotKeyMask[index]=0; ]~kqPw<R  
    bRemoved=TRUE; b39;Sv|#  
    KeyCount--; >k_Z]J6Pd  
    break; !v`q%JW(  
   } uVOpg]8d  
  } ZpI_/  
 }  _%i|*  
 return bRemoved; ufEt"P-X.  
} Hvor{o5|tB  
\ov>?5  
void VerifyWindow() _eO+O=j_x  
{ ;J?^M!l2=  
 for(int i=0;i<MAX_KEY;i++){ Zd~s5  
  if(hCallWnd!=NULL){ l*%voKZG  
   if(!IsWindow(hCallWnd)){ 4Z]^v4vb  
    hCallWnd=NULL; ua7I K~8l  
    HotKey=0; ~}4H=[Zu  
    HotKeyMask=0; nwcT8b 87J  
    KeyCount--; 8Bhot,u'T  
   } s8eiq`6\H}  
  } r<C^hs&]  
 } o~es> ;  
} :MJBbrV ,  
/ HaS.  
BOOL CHookApp::InitInstance() :p8JO:g9  
{ ?7a< V+V:  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); C .YtjLQP$  
 hins=AfxGetInstanceHandle(); A=h`Z^8\B  
 InitHotkey(); ( 7Y :3  
 return CWinApp::InitInstance(); TvI}yaCu/x  
} )](8 {}wo  
]p0m6}B  
int CHookApp::ExitInstance() 2px5>4<  
{ >|z=-hqPK  
 VerifyWindow(); #/1A:ig  
 UnInit(); TU[f"!z^  
 return CWinApp::ExitInstance(); S@_@hFV jd  
} *jA%.F  
Hyee#fB  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 1egryp  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) G ROl9xp2  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ b[RBp0]x  
#if _MSC_VER > 1000 ch : 428  
#pragma once %@pTEhpF  
#endif // _MSC_VER > 1000 g08=D$P  
JZP2NB_xt  
class CCaptureDlg : public CDialog - *yj[?6  
{ Iun!r v  
 // Construction ap;UxWqx  
 public: 7Jc=`Zm'  
  BOOL bTray; zWjGGTP~3&  
  BOOL bRegistered; 3_Oq4/  
  BOOL RegisterHotkey(); n]8_]0{qi  
  UCHAR cKey; zROyG  
  UCHAR cMask; Y|B/(  
  void DeleteIcon(); \19XDqf8  
  void AddIcon(); nMVThN*I g  
  UINT nCount; DB>>U>H-  
  void SaveBmp(); bXC 0f:L  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor e,1Jxz4QH  
  // Dialog Data GSpS8wWD }  
  //{{AFX_DATA(CCaptureDlg) v8pUt\m"  
  enum { IDD = IDD_CAPTURE_DIALOG }; jl:O~UL6i  
  CComboBox m_Key; /9GqEQsfM  
  BOOL m_bControl; c+4SGWmO  
  BOOL m_bAlt; 7g&_`(  
  BOOL m_bShift; $L`7(0U-  
  CString m_Path; f#X`e'1  
  CString m_Number; x!"!oJG^k  
  //}}AFX_DATA \uanQ|Nu  
  // ClassWizard generated virtual function overrides 2d1'!B zDA  
  //{{AFX_VIRTUAL(CCaptureDlg) "aa6W  
 public: 1bj75/i<6  
  virtual BOOL PreTranslateMessage(MSG* pMsg); WtlIrdc  
 protected: C<n.C*o  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ho"FB|e  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); RKBjrSZg8  
  //}}AFX_VIRTUAL 7Uj[0Awn  
  // Implementation jj$'DZk  
 protected: x$s#';*  
  HICON m_hIcon; _=}Y lR  
  // Generated message map functions H56e#:[$  
  //{{AFX_MSG(CCaptureDlg) Ir}&|"~H  
  virtual BOOL OnInitDialog(); Nw|Lrn*h!  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); gNZ^TeT  
  afx_msg void OnPaint(); 1p8E!c{}j  
  afx_msg HCURSOR OnQueryDragIcon(); %FF  S&vd  
  virtual void OnCancel();  ^5 ;Y  
  afx_msg void OnAbout(); u\t ;  
  afx_msg void OnBrowse(); C($`'~b  
  afx_msg void OnChange(); PK+][.6H  
 //}}AFX_MSG 9:=a FP  
 DECLARE_MESSAGE_MAP() y>~Ke UC  
}; /6S/a*`<X  
#endif n+!.0d}6  
Box,N5AA  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 9Z+@i:_}  
#include "stdafx.h" m9PcDhv  
#include "Capture.h" Js=|r;'  
#include "CaptureDlg.h" ;G},xDGO_m  
#include <windowsx.h> p.l]% \QI  
#pragma comment(lib,"hook.lib") wh~~g qi9  
#ifdef _DEBUG m?M(79u[  
#define new DEBUG_NEW |]m&LC  
#undef THIS_FILE ( bBetX  
static char THIS_FILE[] = __FILE__; Y<0f1N  
#endif *dKA/.g  
#define IDM_SHELL WM_USER+1  j, G/[V  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  |u$AzI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -k<.Q=]<t  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 2%@j<yS  
class CAboutDlg : public CDialog uF^+}Y ZT  
{ aa".d[*1  
 public: U7ajDw  
  CAboutDlg(); B8TI 5mZ4  
  // Dialog Data iK.MC%8?  
  //{{AFX_DATA(CAboutDlg) Dt +"E  
  enum { IDD = IDD_ABOUTBOX }; '2.F-~  
  //}}AFX_DATA @Qx;J<{+g  
  // ClassWizard generated virtual function overrides cF/FretoO  
  //{{AFX_VIRTUAL(CAboutDlg) }wv$ #H[  
 protected: #lB[]2]N  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _;@kS<\N  
  //}}AFX_VIRTUAL |r /}r,t}  
  // Implementation Gwvs~jN  
 protected: 2?}(  
  //{{AFX_MSG(CAboutDlg) +T4<}+n  
  //}}AFX_MSG hU4~`g p  
  DECLARE_MESSAGE_MAP() ' bT9AV%  
}; 8KAyif@1::  
8a05`ZdP  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) \<PX'mnO  
{ @D60  
 //{{AFX_DATA_INIT(CAboutDlg) 'wQ=b  
 //}}AFX_DATA_INIT R=9j+74U  
} Jl9T[QAJn1  
zJx<]=]  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) D(r|sw  
{ UW>~C  
 CDialog::DoDataExchange(pDX); %3C,jg  
 //{{AFX_DATA_MAP(CAboutDlg) p 3_Q  
 //}}AFX_DATA_MAP n" MFC  
} hyTi':  
p jrA:;  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) E|5gKp-wJ  
 //{{AFX_MSG_MAP(CAboutDlg) aFC3yMKXh  
 // No message handlers rgP$\xn-  
 //}}AFX_MSG_MAP h]zx7zt-  
END_MESSAGE_MAP() ?]7ITF  
 6f{c  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) eFeeloH?e*  
: CDialog(CCaptureDlg::IDD, pParent) `i.f4]r  
{ Gpgi@ Uf  
 //{{AFX_DATA_INIT(CCaptureDlg) .z{7 rH  
  m_bControl = FALSE; EG1SIEo  
  m_bAlt = FALSE; g^]Q*EBa  
  m_bShift = FALSE; UIu'x_qc  
  m_Path = _T("c:\\"); klx4Mvq+/@  
  m_Number = _T("0 picture captured."); "?N`9J|j)~  
  nCount=0; @lj  
  bRegistered=FALSE; nxH$$}9  
  bTray=FALSE; r^ "mPgY  
 //}}AFX_DATA_INIT yDyq. -Q  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 V*)6!N[5  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); {$s:N&5  
} @RnGK 5  
3s|tS2^4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) -({\eL$n  
{ 95H`-A  
 CDialog::DoDataExchange(pDX); $OUa3!U_!  
 //{{AFX_DATA_MAP(CCaptureDlg) w6E?TI  
  DDX_Control(pDX, IDC_KEY, m_Key); vfo[<"  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); rVN|OLh  
  DDX_Check(pDX, IDC_ALT, m_bAlt); rSZWmns  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); r1=Zoxc=w  
  DDX_Text(pDX, IDC_PATH, m_Path); ;=n7 Z  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 9:kb0oBa?l  
 //}}AFX_DATA_MAP 8F@6^9C  
} ,Tr12#D:  
a;h:o>Do5  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Us%VB q  
//{{AFX_MSG_MAP(CCaptureDlg) J,q:  
 ON_WM_SYSCOMMAND() '@:;oe@]  
 ON_WM_PAINT() [UI bO@e  
 ON_WM_QUERYDRAGICON() zcNV<tx  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 9j,zaGD0  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 7"QcvV@p  
 ON_BN_CLICKED(ID_CHANGE, OnChange) +(P;4ZOmB  
//}}AFX_MSG_MAP G_o/ lIz"  
END_MESSAGE_MAP() "Srp/g]a  
N7M^  
BOOL CCaptureDlg::OnInitDialog() )q=1<V44d  
{ JRo{z{!O6  
 CDialog::OnInitDialog(); V,Gt5lL&/!  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); aI\VqOt]  
 ASSERT(IDM_ABOUTBOX < 0xF000); 5q) Eed  
 CMenu* pSysMenu = GetSystemMenu(FALSE); {<]abO  
 if (pSysMenu != NULL) :WxMv~e{U  
 { KS| $_-7 u  
  CString strAboutMenu; ("TI~  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ]c5Shj5|p  
  if (!strAboutMenu.IsEmpty())  t]vz+VQ  
  { L8$7^muad  
   pSysMenu->AppendMenu(MF_SEPARATOR); sVC5<?OW!p  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 6#K_Rg>.  
  } f{)*"  
 } ML'R[~|  
 SetIcon(m_hIcon, TRUE); // Set big icon 6-JnT_  
 SetIcon(m_hIcon, FALSE); // Set small icon iFHVr'Og'  
 m_Key.SetCurSel(0); $:xUXEi{  
 RegisterHotkey(); e@q[Dv'mu  
 CMenu* pMenu=GetSystemMenu(FALSE); i$F)h<OU+  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); $6J5yE  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); '2 )d9_ w  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); c^=:]^  
 return TRUE; // return TRUE unless you set the focus to a control 1XZ&X]  
} -p)HH@6a  
NT-du$! u  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) J L Z  
{ \Js9U|lY  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) =X1$K_cN  
 { w"sRK  
  CAboutDlg dlgAbout; 95+}NJ;r  
  dlgAbout.DoModal(); \l[5U3{  
 } yy>4`_  
 else Uvuvr_IP  
 { S\f^y8*<  
  CDialog::OnSysCommand(nID, lParam); 7<KRB\)b&  
 } -kJF@w6u  
} [mwfgh&4%  
p1&d@PF&&  
void CCaptureDlg::OnPaint() s+CWyW@  
{ E+01"G<Q  
 if (IsIconic()) lz>5bR'  
 { +&t{IP(?  
  CPaintDC dc(this); // device context for painting ypsCyDQK`  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 2T|L# #C  
  // Center icon in client rectangle Fdzd!r1 v  
  int cxIcon = GetSystemMetrics(SM_CXICON); l >O]Cpt  
  int cyIcon = GetSystemMetrics(SM_CYICON); "w A8J%:  
  CRect rect; IGp-`%9  
  GetClientRect(&rect); &zm5s*yNt  
  int x = (rect.Width() - cxIcon + 1) / 2; ? &1?uc  
  int y = (rect.Height() - cyIcon + 1) / 2; [OT@gp:  
  // Draw the icon >!oN+8[~  
  dc.DrawIcon(x, y, m_hIcon); `=\G>#p<T  
 } ( {8Q=Gh  
 else 9~4Kbmr>q  
 { MBg^U<t8  
  CDialog::OnPaint(); ^*0;Z<_  
 } =B/^c>w2  
} m\VJ=  
w S;(u[W  
HCURSOR CCaptureDlg::OnQueryDragIcon() |{_%YM($  
{ 5]F9o9]T  
 return (HCURSOR) m_hIcon; ?hwQY}   
} ) wGC=,  
SC!IQ80H#D  
void CCaptureDlg::OnCancel() ~svu0[Vx  
{ aN7u j  
 if(bTray) QF^An B  
  DeleteIcon(); vCi:c Ip/  
  CDialog::OnCancel(); d }]b  
} 5}By2Tx  
ElYHA  
void CCaptureDlg::OnAbout() BY 1~\M  
{ !"1bV [^  
 CAboutDlg dlg; :<jf}[w!  
 dlg.DoModal(); 7'<4'BGzl]  
} WpvH} l r}  
X!"y>J  
void CCaptureDlg::OnBrowse() :q= XE$%H  
{ ,= PDL  
 CString str; 6 HEl1FK{@  
 BROWSEINFO bi; ;or> Sh7  
 char name[MAX_PATH]; f.u{;W  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ,%:`Ll t]$  
 bi.hwndOwner=GetSafeHwnd(); -Pvt+I>  
 bi.pszDisplayName=name; {=(4  
 bi.lpszTitle="Select folder"; A,iXiDb3pK  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; w}E?FEe.  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 1]kk  
 if(idl==NULL) a`{'u)@  
  return; qVY\5`f@  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); w68qyG|wM  
 str.ReleaseBuffer(); Tq?W @DM*  
 m_Path=str; q`\lvdl  
 if(str.GetAt(str.GetLength()-1)!='\\') 8cd,SQ}y  
  m_Path+="\\"; BpK P]V  
 UpdateData(FALSE); k'\RS6M`L  
} kC#;j=K?  
v<-D>iJ  
void CCaptureDlg::SaveBmp() A^m hPBT_  
{ 0(..]\p^d  
 CDC dc; J 5\> 8I,a  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); GC{Ys|s  
 CBitmap bm; Isi ,Tl ^  
 int Width=GetSystemMetrics(SM_CXSCREEN); Z-~^)lo  
 int Height=GetSystemMetrics(SM_CYSCREEN); }\irr9,  
 bm.CreateCompatibleBitmap(&dc,Width,Height); oW8[2$_N+  
 CDC tdc; D2hvf ^g'*  
 tdc.CreateCompatibleDC(&dc); M,[ClQ 9  
 CBitmap*pOld=tdc.SelectObject(&bm); dNyc|P`U  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); c.XLEjV|  
 tdc.SelectObject(pOld); !K@y B)9  
 BITMAP btm; ^8\pJg_0  
 bm.GetBitmap(&btm); G(4k#jB  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; $M><K  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); vuK 5DG4  
 BITMAPINFOHEADER bih; SY{J  
 bih.biBitCount=btm.bmBitsPixel; mH hm~u  
 bih.biClrImportant=0; ]A\n>Z!;  
 bih.biClrUsed=0; K;Xn!:) V:  
 bih.biCompression=0; dxd}:L~z  
 bih.biHeight=btm.bmHeight; y3xP~]n  
 bih.biPlanes=1; xq]&XlA:ug  
 bih.biSize=sizeof(BITMAPINFOHEADER); Z BYmAD  
 bih.biSizeImage=size; 71 2i |  
 bih.biWidth=btm.bmWidth; O-|3k$'\z  
 bih.biXPelsPerMeter=0; ~q9RZ#g13J  
 bih.biYPelsPerMeter=0; 4gZN~_AI<  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); DQRt\!  
 static int filecount=0; |[V(u  
 CString name; =];FojC6I  
 name.Format("pict%04d.bmp",filecount++); 1H ZexV  
 name=m_Path+name; j@:L MR>  
 BITMAPFILEHEADER bfh; 4SOj>(a#  
 bfh.bfReserved1=bfh.bfReserved2=0; ]F_u  
 bfh.bfType=((WORD)('M'<< 8)|'B'); S !e0 :  
 bfh.bfSize=54+size; ql zL<  
 bfh.bfOffBits=54; K[9<a>D`  
 CFile bf; E^qKkl  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ z4<h)hh"k6  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); A76=^ iw  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); R:fu n ,  
  bf.WriteHuge(lpData,size); )Qo6bei!  
  bf.Close(); QR#,n@fE  
  nCount++; ~:0h o  
 } t2E_y6  
 GlobalFreePtr(lpData); {Cd*y6lI  
 if(nCount==1) LO2sP"9  
  m_Number.Format("%d picture captured.",nCount); ffWvrY;j[  
 else N$3F4b%+  
  m_Number.Format("%d pictures captured.",nCount); [m"X*Z F  
  UpdateData(FALSE); isN"7y|r:X  
} FYi<+]HZ  
eD/?$@y  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) EEaFi 8  
{ |GsLcUv6  
 if(pMsg -> message == WM_KEYDOWN) Qejzp/2  
 { yZ2,AR%  
  if(pMsg -> wParam == VK_ESCAPE) MdPwuXI  
   return TRUE; lyT~>.?{  
  if(pMsg -> wParam == VK_RETURN) ND`~|6yb  
   return TRUE; ru U|  
 } #8(@a Y  
 return CDialog::PreTranslateMessage(pMsg); ugL$W@   
} rN*4Y  
"44X'G8N  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) OU[Sm7B  
{ c2y5[L7?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 4v{gc/g  
  SaveBmp(); c1Hv^*Y  
  return FALSE; )9*-Q%zc  
} aR3W9  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ D]0#A|n F  
 CMenu pop; %++q+pa  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); +F@9AO>LF  
 CMenu*pMenu=pop.GetSubMenu(0); #A|M NJ%m  
 pMenu->SetDefaultItem(ID_EXITICON); 5zU D W?  
 CPoint pt; ?2i``-|Wa  
 GetCursorPos(&pt); cL}g7D  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ?>w%Lg{L}  
 if(id==ID_EXITICON) +XQS -=  
  DeleteIcon(); [k.<x'#  
 else if(id==ID_EXIT) Y`_6Ny="  
  OnCancel(); 7y60-6r  
 return FALSE; @1kA%LLK  
} ){,8}(|  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); i#eb%9Mn  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 9\dC8  
 AddIcon(); i JQS@2=A  
 return res; +DU}f;O8v  
} lT%o6qgT  
Xf.SJ8G  
void CCaptureDlg::AddIcon() {!<zk+h$  
{ e}Db-7B_~  
 NOTIFYICONDATA data; x&7!m  
 data.cbSize=sizeof(NOTIFYICONDATA); d-c+ KV  
 CString tip; h<}4mo_ $  
 tip.LoadString(IDS_ICONTIP); yYW>)  
 data.hIcon=GetIcon(0); b>o38(  
 data.hWnd=GetSafeHwnd(); f):|Ad|  
 strcpy(data.szTip,tip); VkUMMq{  
 data.uCallbackMessage=IDM_SHELL; "EA%!P:d,  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; aiz_6@Qfz*  
 data.uID=98; $L3UDX+F  
 Shell_NotifyIcon(NIM_ADD,&data); "zYlddh  
 ShowWindow(SW_HIDE); ['{mW4i  
 bTray=TRUE; ]r|X[9  
} @C?RbTHy  
k|&@xEbS  
void CCaptureDlg::DeleteIcon() !x&/M*nBE  
{ -MeGJX:^I  
 NOTIFYICONDATA data; yV_aza  
 data.cbSize=sizeof(NOTIFYICONDATA); T,5]EHea  
 data.hWnd=GetSafeHwnd(); yv&&x.!.Z  
 data.uID=98; Z}WMpp^r  
 Shell_NotifyIcon(NIM_DELETE,&data); xMU4Av[{  
 ShowWindow(SW_SHOW); TVQ9"C  
 SetForegroundWindow(); 8I`>tY  
 ShowWindow(SW_SHOWNORMAL); iz& )FuOr  
 bTray=FALSE; g&X$)V4C  
} h>q& X4-  
m{;2!  
void CCaptureDlg::OnChange() [>v.#:YM^  
{ RlC|xj"l%  
 RegisterHotkey(); eqg|bc[i!t  
} 7<=xc'*8t  
R>yoMk/u  
BOOL CCaptureDlg::RegisterHotkey() 5v6*.e'p  
{ 0M>+.}e+  
 UpdateData(); B&VruOP0  
 UCHAR mask=0; o^}K]ML!t  
 UCHAR key=0; VMZ\9IwI  
 if(m_bControl) Mnc9l ^  
  mask|=4; lmf vT}$B  
 if(m_bAlt)  $TGE  
  mask|=2; uD}Q}]Z  
 if(m_bShift) K)QM xn  
  mask|=1; k+t?EZ6L  
  key=Key_Table[m_Key.GetCurSel()]; uD4on}  
 if(bRegistered){ &gR)Y3  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 3MH9%*w'0  
  bRegistered=FALSE; 5bKM}? =L  
 } V:s$V.{!  
 cMask=mask; "wy|gnQJ  
 cKey=key; %-1-y]R|  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); fh,kbn==r?  
 return bRegistered; 98'/yZ  
} B:J([@\'  
6Cfu19Dx  
  四、小结 mE\sD<b  
W|'7)ph  
  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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