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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: g6N{Z e Wg  
  H*l8,*M}  
  一、实现方法 *iYs,4  
Xh){W~ -  
  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: #MI}KmH  
Ij#?r2Z%  
#pragma data_seg("shareddata") Pj+XKDV]T  
HHOOK hHook =NULL; //钩子句柄 yaeX-'(Fv[  
UINT nHookCount =0; //挂接的程序数目 }4+S_b  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 bGDV9su  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 3C.bzw^  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey a?@j`@]ZR~  
static int KeyCount =0; ]` 3;8,  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 7:;P>sF@  
#pragma data_seg() #S QFI;zj  
]{dg"J  
  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。 3pm;?6i6  
aWW|.#L  
  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: 6N6d[t"  
K47W7zR  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 7ej"q  
cKey,UCHAR cMask) 2T iUo(MK  
{ 7j{SCE;  
 BOOL bAdded=FALSE; *y7^4I-J  
 for(int index=0;index<MAX_KEY;index++){ ?-J\~AXL  
  if(hCallWnd[index]==0){ M" %w9)@  
   hCallWnd[index]=hWnd; entO"~*EX  
   HotKey[index]=cKey; p.&FK'&[0  
   HotKeyMask[index]=cMask; O']-<E`1k  
   bAdded=TRUE; &rk /ya[  
   KeyCount++; l3-;z)SgH  
   break; }7k+tJ<   
  } >OmY  
 } b=.Ikt+y  
 return bAdded; |5`z;u7V  
} BY72fy#e  
//删除热键 EnZrnoGM  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) T/UhZ4(V  
{ ^HQg$}=  
 BOOL bRemoved=FALSE; b$H{|[  
 for(int index=0;index<MAX_KEY;index++){ I[G<aI!  
  if(hCallWnd[index]==hWnd){ ;)~loa1\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #:e52=  
    hCallWnd[index]=NULL; -# |J  
    HotKey[index]=0; +hqsIx  
    HotKeyMask[index]=0; 5L%A5C&|  
    bRemoved=TRUE; NAlYfbp  
    KeyCount--; .{*V^[.  
    break; k7W7S`H  
   } Ft#d & I  
  } ci <`*>l  
 } e@F9'z4  
 return bRemoved; Ir}r98lz  
} z;x $tO  
A90o X1l  
+x\b- '  
  DLL中的钩子函数如下: X~T"n<:a>  
]2+7?QL,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) SoI"a^fY  
{ ,nD:W  
 BOOL bProcessed=FALSE; ! jm>  
 if(HC_ACTION==nCode) KW ]/u  
 {  LkD$\i  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 hS/oOeG<Y  
   switch(wParam) G>qzAgA  
   {  |<t"O  
    case VK_MENU: g@BQ!}_#5  
     MaskBits&=~ALTBIT; xv4_q-r[  
     break; zB kS1qMn  
    case VK_CONTROL: |[7xTD  
     MaskBits&=~CTRLBIT; Z_.Eale^  
     break; C0eP/d  
    case VK_SHIFT: uW3`gwwlU  
     MaskBits&=~SHIFTBIT; X>(?  
     break; Pwn"!pk  
    default: //judge the key and send message I ww.Nd2  
     break; N:[22`NP  
   } &`[y]E'  
   for(int index=0;index<MAX_KEY;index++){ +rse,b&U(  
    if(hCallWnd[index]==NULL) a-w=LpVM  
     continue; ip6$Z3[)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9i4!^DM_  
    { &Ohm]g8{2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); [C 1o9c!  
     bProcessed=TRUE; m:|jv|f  
    } wO:!B\e  
   } J-C3k`%O  
  } $t.i)wg +  
  else if((lParam&0xc000ffff)==1){ //有键按下 *{/ ww9fT  
   switch(wParam) H{Tt>k  
   { {*WJ"9ujp]  
    case VK_MENU: 0 ?kaXD  
     MaskBits|=ALTBIT; ,'[&" Eg  
     break; )wkh  
    case VK_CONTROL: H}G=%j0  
     MaskBits|=CTRLBIT; 34S|[PX d  
     break; n^<3E; a  
    case VK_SHIFT: <WXO].^  
     MaskBits|=SHIFTBIT; ,M@LtA3g  
     break; 4u} "ng   
    default: //judge the key and send message Kjbt1n  
     break; [^wEKRt&  
   } ;{1J{-EA  
   for(int index=0;index<MAX_KEY;index++){ O^fg~g X  
    if(hCallWnd[index]==NULL) .XPcH(q  
     continue; v=!Ap ; 2L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0Y rdu,c  
    { .yz-o\,gF%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Z9cg,#(D  
     bProcessed=TRUE; jG($:>3a@  
    } HSq.0vYl6  
   } f tBbO8e  
  } `J*~B  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 f8]Qn8  
   for(int index=0;index<MAX_KEY;index++){ IT,d(UV_  
    if(hCallWnd[index]==NULL) T3po.Km\{  
     continue; !'uLV#YEZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Wxjv=#3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); QuuR_Ao?c'  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 rBBA`Ut@F  
   } -QH[gi{%`  
  } J?/.|Y]e  
 } p^^Ai  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); rEI]{?eoF  
} @8zp(1.  
/Mq]WXq[V  
  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: KP)BD;  
)c9]}:W&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]W,K}~!   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _n9+(X3  
y/' ^r?  
  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: a }6Fj&hj  
L||_Jsu  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8?qEv,W  
{ c*nH=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ?h`Ned0P  
 { u rGk_.f  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 CbK&.a  
  SaveBmp(); jYwv+EXg  
  return FALSE; *SkUkqP9z  
 } +3VDapfin  
 …… //其它处理及默认处理 6T%5vg_};'  
} wn*z*  
)k5lA=(Yr+  
Sz0M8fYT]  
  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。 i4T U}.h8  
XQEGMaZ  
  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。 4}{S8fGk%  
bH7[6#y$  
  二、编程步骤 } g  WSV  
iQ= %iou  
  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"; HgG-r&r!2  
_E5%Px5>L  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; % '>S9Ja3  
<YbOO{  
  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; Hfer\+RX  
e_J_rx  
  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; l*[.  
E-,74B&H  
  5、 添加代码,编译运行程序。 pL$UI3VCP  
&]~z-0`$!  
三、程序代码 )Q 8T`Tly  
bw#zMU^E  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Kq/W-VyGh  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) sg 12C  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ jY-i`rJN  
#if _MSC_VER > 1000 fk!wq. a  
#pragma once +3e(psdg  
#endif // _MSC_VER > 1000 oS)0,p  
#ifndef __AFXWIN_H__ s-r$%9o5  
#error include 'stdafx.h' before including this file for PCH 5EIhCbA  
#endif W|=?-  
#include "resource.h" // main symbols e , zR  
class CHookApp : public CWinApp |0(Z)s,  
{ 5VWXUNe@_q  
 public:  TyMR m  
  CHookApp(); q`09   
  // Overrides YZ\$b=-  
  // ClassWizard generated virtual function overrides >]"5K<-1  
  //{{AFX_VIRTUAL(CHookApp) P ]2M  
 public: VL"ZC:n)-  
  virtual BOOL InitInstance(); P,!W\N%3  
  virtual int ExitInstance(); UuxWP\~2  
  //}}AFX_VIRTUAL ?n/:1LN,  
  //{{AFX_MSG(CHookApp) !-r@_tn|  
  // NOTE - the ClassWizard will add and remove member functions here. KtHh--j`  
  // DO NOT EDIT what you see in these blocks of generated code ! :c,\8n  
  //}}AFX_MSG U;Hu:q*  
  DECLARE_MESSAGE_MAP() BZ1@?3  
}; WX 79V  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); %Zx/XMs}e  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :<%K6?'@^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); TEB%y9  
BOOL InitHotkey(); |LKhT4rE  
BOOL UnInit(); {Cs~5jYz  
#endif {a_= 4a  
MLmc]nL=  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 'O]_A57  
#include "stdafx.h" iUA2/ A  
#include "hook.h" %xLziF  
#include <windowsx.h>  AO;+XP=  
#ifdef _DEBUG \WouTn  
#define new DEBUG_NEW H1|X0 a(j  
#undef THIS_FILE 65ijzZL;  
static char THIS_FILE[] = __FILE__; '. atbl  
#endif dz5bW>  
#define MAX_KEY 100 4'+/R%jk"  
#define CTRLBIT 0x04 60~{sk~E  
#define ALTBIT 0x02 (W3R3>;  
#define SHIFTBIT 0x01 yhQo1e>  
#pragma data_seg("shareddata") UOF5&>MLb  
HHOOK hHook =NULL; 8[f]9P/i  
UINT nHookCount =0; ?Pl>sCFm~  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey l/LRr.x  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT &[I#5 bGk  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey H|F>BjXn5  
static int KeyCount =0; .IpwTke'  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Ew4DumI  
#pragma data_seg() ,Q(n(m'  
HINSTANCE hins; } 5OlX  
void VerifyWindow(); E3,Z(dpX!  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) XPUH\I=  
//{{AFX_MSG_MAP(CHookApp) HtY\!_Ea  
// NOTE - the ClassWizard will add and remove mapping macros here. jc;&g)Rv  
// DO NOT EDIT what you see in these blocks of generated code! :+]6SC0ql  
//}}AFX_MSG_MAP F8b*Mt}p  
END_MESSAGE_MAP() iv#9{T  
}}grJh>tGg  
CHookApp::CHookApp() }kL% l  
{ 76=uk!#3{  
 // TODO: add construction code here, hpWAQ#%oHm  
 // Place all significant initialization in InitInstance j(nPWEyJM  
} ]}>GUXe)^  
<%pi*:E|  
CHookApp theApp; jE2ziK  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) J[LGa:``  
{ axU!o /m>  
 BOOL bProcessed=FALSE; .vQ2w  
 if(HC_ACTION==nCode) qcQ`WU{  
 { '-w G  
  if((lParam&0xc0000000)==0xc0000000){// Key up J5J3%6I  
   switch(wParam) EF)kYz!@  
   { c~R ElL  
    case VK_MENU: \FVR'A1  
     MaskBits&=~ALTBIT; =\X<UA}  
     break; ODv)-J  
    case VK_CONTROL: 1Lj\"+.  
     MaskBits&=~CTRLBIT; )}G HG#D{  
     break; !3yR?Xem}  
    case VK_SHIFT: &e,xN;  
     MaskBits&=~SHIFTBIT; qf24l&}  
     break; WHE*NWz>q  
    default: //judge the key and send message u#J5M&#  
     break; (CZRX9TT1  
   } kf"cd 1  
   for(int index=0;index<MAX_KEY;index++){ Mv4JF(,S  
    if(hCallWnd[index]==NULL) rX;(48Y  
     continue; +#&2*nY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ctt5t  
    { &k1Ez  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )- 2^Jvc  
     bProcessed=TRUE; Yl-09)7s  
    } 5r zB "L  
   } X*S|aNaLWW  
  } C8&)-v|  
  else if((lParam&0xc000ffff)==1){ //Key down @ULr)&9  
   switch(wParam) XHpoaHyx  
   { CUxSmN2[  
    case VK_MENU: #+Vvf  
     MaskBits|=ALTBIT; JvHJ*E   
     break; >b{%j8u M  
    case VK_CONTROL: ;Kkn7&'F  
     MaskBits|=CTRLBIT; :4Q_\'P  
     break; BIcE3}dS8  
    case VK_SHIFT: b GwLfU  
     MaskBits|=SHIFTBIT; /tt  
     break; d6hWmZVC  
    default: //judge the key and send message P\N`E?lJL  
     break; g-*@I`k[  
   } 3QV|@5L`[  
   for(int index=0;index<MAX_KEY;index++) .'.|s?s  
   { >DbG$V<v'  
    if(hCallWnd[index]==NULL) ;Rwr5  
     continue; Z71"d"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3j.f3~"  
    { h ?p^DPo  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); l'3NiIX  
     bProcessed=TRUE; 2@e<II2ha8  
    } Itz_;+I.Mp  
   } NaVZ)  
  } L}:u9$w  
  if(!bProcessed){ Yj0Ss{Ep  
   for(int index=0;index<MAX_KEY;index++){ 7sLs+ |<"  
    if(hCallWnd[index]==NULL) ?'h@!F%R'  
     continue; (V e[FhA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ND21;  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); TAzhD.6C  
   } 1YM04*H  
  } 7Bmt^J5i&t  
 }  Xv:<sX  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^$x^JM ]/  
} vn,L),"=  
%?RX}37K  
BOOL InitHotkey() B~~rLo:a  
{ % ;6e@U}  
 if(hHook!=NULL){ ] YQ*mvI]  
  nHookCount++; gCwg ;c-  
  return TRUE; TR: D  
 } :&TOQ<vM  
 else =VY[m-q5  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); im1]:kr7  
  if(hHook!=NULL) J@yy2AZnO  
   nHookCount++; o'D6lkf0  
  return (hHook!=NULL); zo]7#  
} gQ/zk3?k  
BOOL UnInit() ^(&:=r.PC  
{ k92189B9j/  
 if(nHookCount>1){ j4brDlo?@  
  nHookCount--; JBjz2$ZM  
  return TRUE; C(?lp  
 } f#^%\K:YYR  
 BOOL unhooked = UnhookWindowsHookEx(hHook); M{z+=c&w  
 if(unhooked==TRUE){ *M KVm)Iv  
  nHookCount=0; {d7KJmN  
  hHook=NULL; 0HG*KW  
 } e@X~F6nP  
 return unhooked; O'5(L9,  
} B V Pf8!-  
<pPI:D@G  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5(U.<  
{ \6@}HFH  
 BOOL bAdded=FALSE; <cWo]T`X!  
 for(int index=0;index<MAX_KEY;index++){  '5[L []A  
  if(hCallWnd[index]==0){ nre8 F  
   hCallWnd[index]=hWnd; 9 -TFyZYU  
   HotKey[index]=cKey; o*dhks[  
   HotKeyMask[index]=cMask; kv5D=0r  
   bAdded=TRUE; a2 YdkdjT  
   KeyCount++; t$UFR7XE  
   break; TJO|{Lxm  
  } kuUH 2:L  
 } d5WE^H)E.  
 return bAdded; eH1Y!&`  
} \>jK\j  
Uvz9x"0[u  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \3Xt\1qN4  
{ /?by4v73P  
 BOOL bRemoved=FALSE; %0"o(y+zt  
 for(int index=0;index<MAX_KEY;index++){ Q>z0?%B  
  if(hCallWnd[index]==hWnd){ o]k[l ;  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8@Y@5)Oc  
    hCallWnd[index]=NULL; 12k)Ek9  
    HotKey[index]=0; 7GPBn}{W  
    HotKeyMask[index]=0; -|ee=BV  
    bRemoved=TRUE; ozGK -$  
    KeyCount--; 5a_K|(~3I  
    break; G%4vZPA  
   } 4#=^YuKaF1  
  } 47t^{WrT  
 } 'RG`DzuF  
 return bRemoved; eJ?SLMLY  
} ;Hm\?n)a  
vO"AJ`_  
void VerifyWindow() mk[=3!J  
{ >r{,$)H0  
 for(int i=0;i<MAX_KEY;i++){ zJ@f {RWZa  
  if(hCallWnd!=NULL){ g:OVAA  
   if(!IsWindow(hCallWnd)){ $r_z""eOc  
    hCallWnd=NULL; N(F9vZOs  
    HotKey=0; Zb}=?fcL;@  
    HotKeyMask=0; m~X:KwK4  
    KeyCount--; @n})oAC,  
   } k deJB-  
  } a:@Eg;aN*O  
 } =k0l>)  
} +fKLCzj  
b/<n:*$   
BOOL CHookApp::InitInstance() #mtlgK'  
{ vY.p~3q :)  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); )8P<ZtEU  
 hins=AfxGetInstanceHandle(); Ee4oTU5Mb  
 InitHotkey(); !QC->  
 return CWinApp::InitInstance(); N!HiQ  
} 'm-s8]-W  
Vwl`A3Y  
int CHookApp::ExitInstance() !o> /gI`  
{ o'Po<I  
 VerifyWindow(); 4UG7{[!+  
 UnInit(); =1LrU$\  
 return CWinApp::ExitInstance(); F#W'>WBU  
} &o)j@5Y?  
g3"`b)M  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |-Y,:sY:  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 4xg%OH  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ _.\p^ HM  
#if _MSC_VER > 1000 NlWIb2,  
#pragma once xNl_Q8Z?R^  
#endif // _MSC_VER > 1000 UJlKw `4  
5a4;d+  
class CCaptureDlg : public CDialog et)A$'Q  
{ C;STJrew  
 // Construction `) K1[&  
 public: N<O^%!buR  
  BOOL bTray; *Q5/d9B8TN  
  BOOL bRegistered; l"O=xt`m{  
  BOOL RegisterHotkey(); E+[K?W5  
  UCHAR cKey; L# (o(4g2  
  UCHAR cMask; G9^!= v@  
  void DeleteIcon(); X@ jml$;$  
  void AddIcon(); -,}f6*  
  UINT nCount; +ZXk0sP_<  
  void SaveBmp(); ar>S_VW*  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor DTgF,c  
  // Dialog Data K]Ed-Tz8QZ  
  //{{AFX_DATA(CCaptureDlg) e|xRK?aVBu  
  enum { IDD = IDD_CAPTURE_DIALOG }; 6?(*:}Q  
  CComboBox m_Key; CCQ<.iCU  
  BOOL m_bControl; NcFHvK  
  BOOL m_bAlt; :8\z 0  
  BOOL m_bShift; Y+j|T`d  
  CString m_Path; u9sffX5x[J  
  CString m_Number; ~eE2!/%9  
  //}}AFX_DATA -:>Mi5/ s  
  // ClassWizard generated virtual function overrides w_4`Wsn  
  //{{AFX_VIRTUAL(CCaptureDlg) @k ~Xem%<  
 public: XeJx/'9o{  
  virtual BOOL PreTranslateMessage(MSG* pMsg); O,XVA  
 protected: -=2tKH`Q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support OG/R6k.  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ,Cde5A{K  
  //}}AFX_VIRTUAL rS8/_'  
  // Implementation 7n}J}8Y*U2  
 protected: sDw&U?gUv  
  HICON m_hIcon; "J3@Z,qW  
  // Generated message map functions [y64%|m  
  //{{AFX_MSG(CCaptureDlg) 7s1FJm=Y/  
  virtual BOOL OnInitDialog(); 9xN4\y6F  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 0ir]  
  afx_msg void OnPaint(); x>Q\j>^  
  afx_msg HCURSOR OnQueryDragIcon(); *8t_$<'dQ  
  virtual void OnCancel(); .$L'Jt2X  
  afx_msg void OnAbout(); Q4}2-}|  
  afx_msg void OnBrowse();  b-yfBO  
  afx_msg void OnChange(); ##EMJi  
 //}}AFX_MSG cZPv6c_w  
 DECLARE_MESSAGE_MAP() LoqS45-)  
}; bK<'J=#1  
#endif [N'YFb3"O  
tNG0ft%a  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file oj;Rh!O  
#include "stdafx.h" q% 2cx@c  
#include "Capture.h" ][I}yOD70  
#include "CaptureDlg.h" /*B-y$WQk  
#include <windowsx.h> hL+)XJu^J  
#pragma comment(lib,"hook.lib") xOt%H\*k"  
#ifdef _DEBUG Xg_M{t  
#define new DEBUG_NEW M._9/ *C U  
#undef THIS_FILE iYEhrb  
static char THIS_FILE[] = __FILE__; -}AAA*P  
#endif GNgPf"}K  
#define IDM_SHELL WM_USER+1 |B./5 ,nSS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); xf_NHKZ)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ncuqo'r  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Q~MV0<{  
class CAboutDlg : public CDialog q5p!Ty"  
{ ,73J#  
 public: s9>-Q"(y  
  CAboutDlg(); [z'PdYQR/{  
  // Dialog Data wi|'pKG  
  //{{AFX_DATA(CAboutDlg) DZ<q)EpC  
  enum { IDD = IDD_ABOUTBOX }; 6F(;=iY8  
  //}}AFX_DATA D C{l.a.  
  // ClassWizard generated virtual function overrides yM`J+tq  
  //{{AFX_VIRTUAL(CAboutDlg) Y(h86>z*w  
 protected: ;G |5kvE>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,qz$6oxh\  
  //}}AFX_VIRTUAL S%uwQ!=O8  
  // Implementation *9Ej fs7L  
 protected: z/dpnGX  
  //{{AFX_MSG(CAboutDlg) (P%{Tab  
  //}}AFX_MSG _a|-_p  
  DECLARE_MESSAGE_MAP() airg[dK  
}; p6VS<L  
Zi<Y?Vm/,O  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) P-[6'mw`  
{ Ha>Hb`  
 //{{AFX_DATA_INIT(CAboutDlg) Ka%u#};  
 //}}AFX_DATA_INIT KzZ|{ !C  
} ixm-wZI  
E4idEQ}H  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) l|TiUjs  
{ >NwS0j$j@  
 CDialog::DoDataExchange(pDX); Cak `}J 2  
 //{{AFX_DATA_MAP(CAboutDlg) W@Et  
 //}}AFX_DATA_MAP 2_k2t ?   
} BC.~wNz6  
`=TV4h4  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) cih[A2lp  
 //{{AFX_MSG_MAP(CAboutDlg) &m<:&h& b  
 // No message handlers 82d~>i%T  
 //}}AFX_MSG_MAP ;7=pNK  
END_MESSAGE_MAP() 3msb"|DG  
*f<+yF{=A  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) T)4pLN E  
: CDialog(CCaptureDlg::IDD, pParent) >8%<ML  
{ TC[(mf:8  
 //{{AFX_DATA_INIT(CCaptureDlg) ( $s%5|  
  m_bControl = FALSE; mcO/V-\5'  
  m_bAlt = FALSE; .Y`;{)  
  m_bShift = FALSE; Dfz3\|LJ  
  m_Path = _T("c:\\"); `_"F7Czn  
  m_Number = _T("0 picture captured."); F%|F-6  
  nCount=0; rx[l7F q  
  bRegistered=FALSE; iwM$U( 9  
  bTray=FALSE; %)'# d  
 //}}AFX_DATA_INIT X 0\O3l* j  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 uUmkk  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 0o-. m  
} Kd,8PV*_  
QT`|"RI%  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) zH)M,+P  
{ ZRCm'p3  
 CDialog::DoDataExchange(pDX); B=!&rKF  
 //{{AFX_DATA_MAP(CCaptureDlg) =o_Ua^mr  
  DDX_Control(pDX, IDC_KEY, m_Key); kz30! L  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); d-%bRGo/  
  DDX_Check(pDX, IDC_ALT, m_bAlt); , yd]R4M  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); zvEofK  
  DDX_Text(pDX, IDC_PATH, m_Path); 9Su4nt`i  
  DDX_Text(pDX, IDC_NUMBER, m_Number); cpLlkR O  
 //}}AFX_DATA_MAP JJE?!Yvc  
} |!Ryl}Oi  
Hs6?4cgj  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) E@} NV|90  
//{{AFX_MSG_MAP(CCaptureDlg) YmwUl>@{  
 ON_WM_SYSCOMMAND() E^K<b7  
 ON_WM_PAINT() \mo NpKf  
 ON_WM_QUERYDRAGICON() IJ[r!&PY  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 2wX4e0cOI4  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Xg4i H5!E  
 ON_BN_CLICKED(ID_CHANGE, OnChange) MJ.K,e  
//}}AFX_MSG_MAP nXRT%[o&  
END_MESSAGE_MAP() sd m4zV]&  
;URvZ! {/Z  
BOOL CCaptureDlg::OnInitDialog() 8GN_ 3pT  
{ lq'MLg  
 CDialog::OnInitDialog(); %:S4OT8]  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); &hnI0m=X  
 ASSERT(IDM_ABOUTBOX < 0xF000); a*kvU"]  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 6< hE]B)  
 if (pSysMenu != NULL) }w_r(g?\  
 { ojva~mnFf  
  CString strAboutMenu; yw@kh^L  
  strAboutMenu.LoadString(IDS_ABOUTBOX); d}:eLC  
  if (!strAboutMenu.IsEmpty()) {3LAK[ C  
  { -Z(='A  
   pSysMenu->AppendMenu(MF_SEPARATOR); T9'd?nw9  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;udV"7C  
  } RW4,j&)  
 } GZt L-   
 SetIcon(m_hIcon, TRUE); // Set big icon ^!v{ >3  
 SetIcon(m_hIcon, FALSE); // Set small icon &# < M o  
 m_Key.SetCurSel(0); qP k`e}D  
 RegisterHotkey(); =F<bAZ  
 CMenu* pMenu=GetSystemMenu(FALSE); '#eY4d<i]n  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); o)2KQ$b>Q  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); (~IoRhp^  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); CqVeR';2  
 return TRUE; // return TRUE unless you set the focus to a control zB68%  
} Jk=_8Xvr`  
k}&7!G@T  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) EA``G8Vn>  
{ J`[v u4  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ZJf:a}=h  
 { %o  
  CAboutDlg dlgAbout; 5Y4#aq  
  dlgAbout.DoModal(); DD fw& y  
 } )R^&u`k  
 else r "uQ|  
 { KD* xFap  
  CDialog::OnSysCommand(nID, lParam); G%F}H/|R  
 } uc>]-4  
} w!|jL $5L  
/g)(  
void CCaptureDlg::OnPaint() +R2+?v6  
{ <N(r -  
 if (IsIconic()) 90Bn}@t=Q  
 { IgyoBfj\d  
  CPaintDC dc(this); // device context for painting 5q,ZH6\ {  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); PJF1+I.%c#  
  // Center icon in client rectangle :*I=' M9B  
  int cxIcon = GetSystemMetrics(SM_CXICON); q@&6&cd  
  int cyIcon = GetSystemMetrics(SM_CYICON); -T=sY/O  
  CRect rect; {2.zzev'  
  GetClientRect(&rect); &V(;zy4(R  
  int x = (rect.Width() - cxIcon + 1) / 2; +mRc8G  
  int y = (rect.Height() - cyIcon + 1) / 2; Wl0p-h  
  // Draw the icon mJ>msI @  
  dc.DrawIcon(x, y, m_hIcon); /T<))@$  
 } kyH0J[/n  
 else 9)*218.  
 { Am@:<J  
  CDialog::OnPaint(); d+WNg2#v  
 } Ay@/{RZz  
} 83!{?EPE  
- !QVM\t  
HCURSOR CCaptureDlg::OnQueryDragIcon() ;DgQ8"f  
{ =Cc]ugl7-  
 return (HCURSOR) m_hIcon; 7e:eL5f>~  
} _;mA(j  
ZJ8"5RW  
void CCaptureDlg::OnCancel() %Y-5L;MI  
{ ER,!`C]  
 if(bTray) G{74o8  
  DeleteIcon(); hem>@Bp'V  
  CDialog::OnCancel(); q8!X^1F7  
} 43,baeG  
MxDqp;  
void CCaptureDlg::OnAbout() u<JkP <"S  
{ BG8`B'i  
 CAboutDlg dlg; 8ly6CP+^B  
 dlg.DoModal(); 4I8QM&7  
} c'D NO~H  
= N^Ec[u(l  
void CCaptureDlg::OnBrowse() t|m=X  
{ M#k$[w}=  
 CString str; WP{U9YF2  
 BROWSEINFO bi; E[Q2ZqhgbP  
 char name[MAX_PATH]; LP'~7FG  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /@64xrvIl=  
 bi.hwndOwner=GetSafeHwnd(); ++ZP X'|  
 bi.pszDisplayName=name; EXsVZg"#  
 bi.lpszTitle="Select folder"; A,EuUp  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; :_|Xr'n`A  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); y3':x[d  
 if(idl==NULL) ;` h$xB(  
  return; \]0#jI/:  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); t?H sfN  
 str.ReleaseBuffer(); ^CK D[s  
 m_Path=str; R*?!xDJ  
 if(str.GetAt(str.GetLength()-1)!='\\') N/eus"O;  
  m_Path+="\\"; fohZ&f|>  
 UpdateData(FALSE); ibn\&}1  
} mU]pK5  
L}7 TM:%  
void CCaptureDlg::SaveBmp() .kTOG'K\e  
{ ;ojJXH~$}  
 CDC dc; .u'MMe>^  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); D&x.io  
 CBitmap bm; 26p_fKY  
 int Width=GetSystemMetrics(SM_CXSCREEN); y@SI)&D  
 int Height=GetSystemMetrics(SM_CYSCREEN); "xNP"S  
 bm.CreateCompatibleBitmap(&dc,Width,Height); _>bk'V7  
 CDC tdc; Uz=o l.E  
 tdc.CreateCompatibleDC(&dc); ,/qY 9eh  
 CBitmap*pOld=tdc.SelectObject(&bm); MEu{'[C  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 2FY]o~@  
 tdc.SelectObject(pOld); m/q`k  
 BITMAP btm; 2%| n}V[  
 bm.GetBitmap(&btm); 4+89 M  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Gx*B(t]4y  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 3 }3C*w+  
 BITMAPINFOHEADER bih; R8 LHwRQ  
 bih.biBitCount=btm.bmBitsPixel; >S8 n 8U  
 bih.biClrImportant=0; b4f3ef  
 bih.biClrUsed=0; CM6! 1 7  
 bih.biCompression=0; a)L|kux;l  
 bih.biHeight=btm.bmHeight; KAi_+/]K_  
 bih.biPlanes=1; uqD|j:~ =k  
 bih.biSize=sizeof(BITMAPINFOHEADER); SW5n?Qj3-  
 bih.biSizeImage=size; <\$?.tTZ {  
 bih.biWidth=btm.bmWidth; 7'gk=MQc  
 bih.biXPelsPerMeter=0; hkRqtpYK  
 bih.biYPelsPerMeter=0; OdO n wY  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 96S$Y~G# &  
 static int filecount=0; 3.9/mztS  
 CString name; ~~O4!|t  
 name.Format("pict%04d.bmp",filecount++); f\r"7j  
 name=m_Path+name; <m0=bm{j  
 BITMAPFILEHEADER bfh; U5OFw+J  
 bfh.bfReserved1=bfh.bfReserved2=0; aPRMpY-YC3  
 bfh.bfType=((WORD)('M'<< 8)|'B'); RN}joKV  
 bfh.bfSize=54+size; T`,G57-5  
 bfh.bfOffBits=54; 4l>U13~#  
 CFile bf; ^y%8_r&  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ~Ye nH  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); .V\~#Ro$G  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); C+>mehDC_G  
  bf.WriteHuge(lpData,size); G$luGxl[  
  bf.Close(); I!}V+gu=  
  nCount++; 2bG92  
 } q(csZ\e=  
 GlobalFreePtr(lpData); 7IQa Xcl  
 if(nCount==1) vE1:;%Q  
  m_Number.Format("%d picture captured.",nCount); Vk2%yw>  
 else .wUnN8crQ  
  m_Number.Format("%d pictures captured.",nCount); 4.Fh4Y:$'  
  UpdateData(FALSE); !T2{xmHKv$  
} 6, |>;,U7  
:5'hd^Q  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 6G#[Mc yn  
{ f,|;eF-Z  
 if(pMsg -> message == WM_KEYDOWN) ;JgSA&'e  
 { SL`; `//  
  if(pMsg -> wParam == VK_ESCAPE) 4sX? O4p  
   return TRUE; W7(5z  
  if(pMsg -> wParam == VK_RETURN) .t9`e=%  
   return TRUE; [w-Tf&  
 } ^uphpABpD  
 return CDialog::PreTranslateMessage(pMsg); \gK'g-)}  
} .mg0L\  
q(WGvl^r  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) LN5BU,4=  
{ L@jpid95  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ X\w["! B  
  SaveBmp(); o( mA(h  
  return FALSE; v~W ;&{  
} he@Y1CY  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Fe+(+ S  
 CMenu pop; `sy_'`i>X  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); $FDGHFM  
 CMenu*pMenu=pop.GetSubMenu(0); L>&{<M_  
 pMenu->SetDefaultItem(ID_EXITICON); 8r:T&)v  
 CPoint pt; 7xY&7 x(v  
 GetCursorPos(&pt); Z-pZyDz  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); qT:`F  
 if(id==ID_EXITICON) ;8 *"c  
  DeleteIcon(); KY0<N 9{  
 else if(id==ID_EXIT) C-@M|K9A'  
  OnCancel(); ;Jb% 2?+=!  
 return FALSE; Fp"c {  
} pIug$Ke_%  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); <0m^b#hdG  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) O'xp"e,  
 AddIcon(); k2_y84;D  
 return res; U#sv.r/L}3  
} s jaaZx1  
m*h O@M  
void CCaptureDlg::AddIcon() WP Gp(X w  
{ .QA1'_9  
 NOTIFYICONDATA data; =Lb(N61  
 data.cbSize=sizeof(NOTIFYICONDATA); tNOOaj9mw  
 CString tip; ()$m9%x  
 tip.LoadString(IDS_ICONTIP); 09 f;z  
 data.hIcon=GetIcon(0); {j<?+o5A  
 data.hWnd=GetSafeHwnd(); YguW2R=6]  
 strcpy(data.szTip,tip); y5D3zqCG  
 data.uCallbackMessage=IDM_SHELL; /,j'V r\"  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; !\$4A,  
 data.uID=98; %U .x9UL  
 Shell_NotifyIcon(NIM_ADD,&data); M\Wg|gpy  
 ShowWindow(SW_HIDE); n:?a=xY  
 bTray=TRUE; >MhZ(&iD  
} \l# H#~  
%m/5! "  
void CCaptureDlg::DeleteIcon() >}C:EnECy  
{ Xi+l1xe  
 NOTIFYICONDATA data; VP?Q$?a  
 data.cbSize=sizeof(NOTIFYICONDATA); &$#NV@  
 data.hWnd=GetSafeHwnd(); <]#_&Na  
 data.uID=98; <h<_''+  
 Shell_NotifyIcon(NIM_DELETE,&data); P.=Dd"La  
 ShowWindow(SW_SHOW); W>,D$  
 SetForegroundWindow(); sebuuL.l0<  
 ShowWindow(SW_SHOWNORMAL); =+<DNW@%  
 bTray=FALSE; jd "YaZOQ  
} V=PK)FJ  
<~svy)Cz  
void CCaptureDlg::OnChange() .Rb1%1bdc  
{ Lm0q/d2|\X  
 RegisterHotkey(); +K2HMf'  
} mM+^v[=  
WS1Y maV  
BOOL CCaptureDlg::RegisterHotkey() &4M,)Q (  
{ U D5hk  
 UpdateData(); NjdDImz.;s  
 UCHAR mask=0; Q(Pc  
 UCHAR key=0; O\@0o|NM  
 if(m_bControl) `V*$pHo  
  mask|=4; q'Y)Y(d  
 if(m_bAlt) YPw=iF]  
  mask|=2;  xG'F  
 if(m_bShift) =}e{U&CX  
  mask|=1; uw`J5TND  
  key=Key_Table[m_Key.GetCurSel()]; "Gq%^^ *  
 if(bRegistered){ 5fp&!HnG  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); -.Z;n1'^  
  bRegistered=FALSE; "9y 0]~  
 } sE^= ]N  
 cMask=mask; @ "C P@^  
 cKey=key; K2tOt7M!  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )S@TYzdAN  
 return bRegistered; A{DE7gp!  
} WxtB:7J  
e\*N Lj_(  
  四、小结 WOYN% 0#  
S;nlC  
  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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