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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: N ,nvAM  
  \:9<d@?  
  一、实现方法 C=8IQl[^e  
`*y%[J,I#  
  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: 3v>w$6  
ih(Al<IS  
#pragma data_seg("shareddata") +c' n,O~3  
HHOOK hHook =NULL; //钩子句柄 !112u#V  
UINT nHookCount =0; //挂接的程序数目  I|. <  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Xh@;4n  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Dn:1Mtj-  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey _71&".A  
static int KeyCount =0; ?$.x%G+  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 cf%aOHYI*  
#pragma data_seg() E'^ny4gL  
8u7QF4 Id  
  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。 9gac7(2`)  
He1~27+99  
  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: F0ylJ /E  
hq?F8 1  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ZwM d 22  
cKey,UCHAR cMask) 3u/ GrsF  
{ N*SUA4bnuM  
 BOOL bAdded=FALSE; @`XbM7D 5  
 for(int index=0;index<MAX_KEY;index++){ EAV6qW\r5]  
  if(hCallWnd[index]==0){ h(p c GE  
   hCallWnd[index]=hWnd; O:Wd ,3_  
   HotKey[index]=cKey; p<c1$O*  
   HotKeyMask[index]=cMask; &"d :+!4h  
   bAdded=TRUE; vDCbD#.6  
   KeyCount++; JfRqOEP4Y  
   break; ufo\p=pGG  
  } &Xi] 0\M)  
 } lm|s%  
 return bAdded; Uj^Y\w-@Z  
} j+[oZfH  
//删除热键 |}Mthj9n  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^+x,211f  
{ ]-jaIvM  
 BOOL bRemoved=FALSE; 5? *Iaw  
 for(int index=0;index<MAX_KEY;index++){ 4@=[r Zb9  
  if(hCallWnd[index]==hWnd){ P5__[aTD  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 00pe4^U  
    hCallWnd[index]=NULL; $ZlzS`XF7  
    HotKey[index]=0; th}&|Y)T2  
    HotKeyMask[index]=0; 8=u88?Bh  
    bRemoved=TRUE; \ESNfL5  
    KeyCount--; 5MK.>3fE  
    break; )}@Z*.HZL  
   } +>Pq]{Uf1j  
  } ='6@^6y  
 } p~OX1RBI  
 return bRemoved; ?dmw z4k0  
} n^` `)"  
#rQT)n  
\jr-^n]  
  DLL中的钩子函数如下: T;v^BVn  
{7.uwIW.1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) x LGMN)@r  
{ GW2v&Ul7(  
 BOOL bProcessed=FALSE; %' eaW  
 if(HC_ACTION==nCode) jvhD_L/  
 { Tsocc5gWZ*  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 h9QQ8}g  
   switch(wParam) 7%W@Hr,%F  
   {  ihD|e&  
    case VK_MENU: '![VA8  
     MaskBits&=~ALTBIT; G0(A~Q"  
     break; e}iv vs2  
    case VK_CONTROL: $]MOAj"LH  
     MaskBits&=~CTRLBIT; U04)XfO;]  
     break; !, {-q)'D  
    case VK_SHIFT: -BH T'zq1S  
     MaskBits&=~SHIFTBIT; \~.elKw<U  
     break; n<Ki.;-ZE  
    default: //judge the key and send message  rB_ESNx  
     break; Mo\nY5  
   } ([]\7}+8  
   for(int index=0;index<MAX_KEY;index++){ gB0Q0d3\G,  
    if(hCallWnd[index]==NULL) M7ug < 8i  
     continue; [ZD`t,x(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X/H2c"!t  
    { )2J#pz?.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); EUS^Gtc  
     bProcessed=TRUE; 1-Q>[Uz,  
    } G{0f* cH)  
   } !J(6E:,b#  
  } a> S -50  
  else if((lParam&0xc000ffff)==1){ //有键按下 $YK~7!!  
   switch(wParam) ~>$z1o&}.  
   { ' wKTWmf?\  
    case VK_MENU: |sBL(9  
     MaskBits|=ALTBIT; -v=tM6  
     break; |T{ZDJ+  
    case VK_CONTROL: 5#::42oE  
     MaskBits|=CTRLBIT; iOiXo6YE  
     break; Hnf?`j>  
    case VK_SHIFT: Z|j\_VKhl  
     MaskBits|=SHIFTBIT; p7[&H/  
     break; yppXecFJ  
    default: //judge the key and send message 2>.>q9J(  
     break; l#a*w  
   } Pz-=Eq  
   for(int index=0;index<MAX_KEY;index++){ #!4`t]E<  
    if(hCallWnd[index]==NULL) Mm%b8#Fe!  
     continue; xI8v'[3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) e*o:ltP./  
    { P7!gUxcv9Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /_r{7Gq.  
     bProcessed=TRUE; _RX*Ps=  
    } D66!C{  
   } rm,h\  
  } `(8RK  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 uQkQ#'e|  
   for(int index=0;index<MAX_KEY;index++){ ,J'@e+jV  
    if(hCallWnd[index]==NULL) qb5IpI{U  
     continue; o Hrx$>W]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 4<U6jB5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); @fd{5 >\  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 F=yE>[! LB  
   } ~PCS_  
  } /7C %m:  
 } E5$uvxCI  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;MjOs&1f0K  
} <@=w4\5j9  
x2+M0 }g  
  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: -ha[xM05  
;^P0+d^5C  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %xt\|Lt  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #K/#-S  
Y'o.`':\~  
  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: iD2>-yf  
hj[sxC>z5  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @m"P_1`*  
{ I)4NCjcCw  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) [Kd"M[1[ <  
 { Zy > W2(<  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 5va ;Ol4  
  SaveBmp(); =eG:Scoug?  
  return FALSE; el,n5O Z7  
 } [ ]=}0l<J  
 …… //其它处理及默认处理 U &y?3  
} 8wA'a'V.  
sg,9{R ^  
3<HPZWc  
  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。 5VW*h  
cin3)lm  
  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。 CB?,[#r5f  
,T7(!)dR  
  二、编程步骤 L!kbDbqn  
Ib$?[  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ;EfREfk  
3(La)|k  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; _95`w9  
>HQ<KFA  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; y?{YQ)fj  
PWs=0.Wj  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; R~(_m#6`:  
uJ/ &!q<3  
  5、 添加代码,编译运行程序。 Cg&cz]*q|  
-44''w?z  
三、程序代码 !u|s| 6{\  
Sc&p*G  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL @KC;"u'C  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) R8R,!3 N  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ <4P"1#nHQ+  
#if _MSC_VER > 1000 u\|Ys  
#pragma once 0"$'1g^]7  
#endif // _MSC_VER > 1000 /<oBgFMoJ  
#ifndef __AFXWIN_H__ G7H'OB &  
#error include 'stdafx.h' before including this file for PCH rfxLCiV  
#endif )wz3 m L  
#include "resource.h" // main symbols )F4P-u  
class CHookApp : public CWinApp 6B>H75S+H  
{ /h73'"SpDy  
 public: Iw) 'Yyg  
  CHookApp(); qluaop  
  // Overrides HCKj8-*  
  // ClassWizard generated virtual function overrides Oe}6jcb6&  
  //{{AFX_VIRTUAL(CHookApp) b n<}  
 public: Po82nKAh  
  virtual BOOL InitInstance(); .(2ui~ed  
  virtual int ExitInstance(); $qj||zA  
  //}}AFX_VIRTUAL Md,KW#  
  //{{AFX_MSG(CHookApp) *>p#/'_E  
  // NOTE - the ClassWizard will add and remove member functions here. # :3~I  
  // DO NOT EDIT what you see in these blocks of generated code ! Ie8jBf -  
  //}}AFX_MSG fQOh%i9n5  
  DECLARE_MESSAGE_MAP() :i:M7}r  
}; IEW[VU)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); | WMq&-$D  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >pn5nn1a  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); tXnD>H YV  
BOOL InitHotkey();  6,;7iA]  
BOOL UnInit(); FrryZe=  
#endif @^kt[$X;  
xiG_l-2l  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Acib<Mi2!-  
#include "stdafx.h" 5 MD=o7O^  
#include "hook.h" p-o!K\o-1  
#include <windowsx.h> L5yv}:.U  
#ifdef _DEBUG \4|o5,+(@  
#define new DEBUG_NEW |cUBS)[)X  
#undef THIS_FILE iZ-"l3) D  
static char THIS_FILE[] = __FILE__; |VD}:  
#endif )$e_CJ}9e  
#define MAX_KEY 100 vL"[7'  
#define CTRLBIT 0x04 fbK`A?5K  
#define ALTBIT 0x02 LdM9k(  
#define SHIFTBIT 0x01 F[ 5\ x0  
#pragma data_seg("shareddata") gT~Yn~~b  
HHOOK hHook =NULL; ;nB.f.e`  
UINT nHookCount =0; 1Qz1 Ehz>  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey CERT`W%o  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ;v^1V+1:z  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey J  4OgV?  
static int KeyCount =0; ,a /<t"  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Cn>RUGoUsI  
#pragma data_seg() D#G(&<Q  
HINSTANCE hins; Lcpz(W ^  
void VerifyWindow(); Xi!`+N4  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp)  G(1y_t  
//{{AFX_MSG_MAP(CHookApp) |SF5'\d'  
// NOTE - the ClassWizard will add and remove mapping macros here. =Wj{J.7mf]  
// DO NOT EDIT what you see in these blocks of generated code! O}IRM|r"  
//}}AFX_MSG_MAP V,CVMbn/%N  
END_MESSAGE_MAP() IDpW5Dc  
_Q1[t9P"  
CHookApp::CHookApp() MKN],l N  
{ 9xm'0 '  
 // TODO: add construction code here, d2e4=/ A%  
 // Place all significant initialization in InitInstance Zr.6J*&!  
} `upxM0gc  
<..|:0Q&~  
CHookApp theApp; 1v^eXvY  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \E<t'\>@X  
{ [10;Mg  
 BOOL bProcessed=FALSE; UI>?"b6 L  
 if(HC_ACTION==nCode) uY6|LTK&x  
 { APA:K9jD  
  if((lParam&0xc0000000)==0xc0000000){// Key up ;<=B I!  
   switch(wParam) ~'9>jpnw  
   { Ev7fvz =  
    case VK_MENU: .j)f'<;%  
     MaskBits&=~ALTBIT; b:w {7  
     break; ZNEWUt{+;^  
    case VK_CONTROL: ~Z#jIG<?g  
     MaskBits&=~CTRLBIT; g/ict 2!  
     break; 9cm9;  
    case VK_SHIFT: D8''q%  
     MaskBits&=~SHIFTBIT; V 2WcPI^  
     break; *To 5\|  
    default: //judge the key and send message h#>%\Pvt;  
     break; <) ` ?s  
   } Y([YDn  
   for(int index=0;index<MAX_KEY;index++){ .oNs8._:  
    if(hCallWnd[index]==NULL) d]*a:>58  
     continue; TE.O@:7Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _a 40lcP  
    { cKKl\g@}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); lp;= f  
     bProcessed=TRUE; D!oELZ3  
    } +w]KK6  
   } 9 ZD4Gv   
  } Lh(` 9(tX  
  else if((lParam&0xc000ffff)==1){ //Key down cj!Ew}o40D  
   switch(wParam) g}B|ZRz+{  
   { @m=xCg.Z  
    case VK_MENU: b&V}&9'[M;  
     MaskBits|=ALTBIT; I;<aJo6Yl  
     break; 2-<i#nA3  
    case VK_CONTROL: J~jR`2+r  
     MaskBits|=CTRLBIT; %fyah}=  
     break; /bd1Bi  
    case VK_SHIFT: LPNJuz  
     MaskBits|=SHIFTBIT; _K?{DnTb  
     break; 2/c^3[ccR  
    default: //judge the key and send message oe8sixZ[  
     break; L/VlmN_v>s  
   } $C;)Tlh  
   for(int index=0;index<MAX_KEY;index++) dSkW[r9Z%l  
   { E?z~)0z2`  
    if(hCallWnd[index]==NULL) ^at X/  
     continue; cN5,\I.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9y~5@/3 2R  
    { nKzS2 u=:Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); x]Nk T  
     bProcessed=TRUE; |aT&rpt   
    } A80r@)i  
   } tX$ v)O|  
  } |Ts|>"F'  
  if(!bProcessed){ {iI" Lt  
   for(int index=0;index<MAX_KEY;index++){ X7*i -v@  
    if(hCallWnd[index]==NULL) VqeK~,}  
     continue; 2)A% 'Akf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) xSQ:#o=8G  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); i'$V'x'k  
   } VR@V3 ~  
  } {F/0pvP9  
 } )r)3.|wJm  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 'TF5CNX  
} 0 2lI-xHe  
!`rR;5&sT  
BOOL InitHotkey() ^rmcyy8;g  
{ 'V=i;2mB*  
 if(hHook!=NULL){ cF[L6{Oe  
  nHookCount++; Wy[Ua#Dd  
  return TRUE; )e$}sw{t  
 } |(Bc0sgw}  
 else 3Vu_-.ID  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); $fhb-c3  
  if(hHook!=NULL) KZ"&c~[  
   nHookCount++; <Oi65O_X  
  return (hHook!=NULL); %q~YJ*\  
} e-Xr^@M*Q  
BOOL UnInit() nNCG*Vu  
{ o~vUqj?BA  
 if(nHookCount>1){ ID-Y*  
  nHookCount--; J\kGD  
  return TRUE; RZtY3:FBx|  
 } Y~P1r]piB  
 BOOL unhooked = UnhookWindowsHookEx(hHook); {W[OjPC~F  
 if(unhooked==TRUE){ 6z6\-45  
  nHookCount=0; a,GOS:?O5  
  hHook=NULL; <Be:fnPX7  
 } (V:z7  
 return unhooked;  =V- ^  
} 8gQg#^,(t  
[O"9OW'2!B  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k//l~A9m  
{ X7cqAi  
 BOOL bAdded=FALSE; <}G*/ z?/  
 for(int index=0;index<MAX_KEY;index++){ 0%Y8M` ~s7  
  if(hCallWnd[index]==0){ i;u#<y{E  
   hCallWnd[index]=hWnd; VO (KQx  
   HotKey[index]=cKey; S~~G0GiW  
   HotKeyMask[index]=cMask; Dsl,(qm5  
   bAdded=TRUE; 0^H"eQO  
   KeyCount++; vn]e`O>y  
   break; MY8[)<q"  
  } <6 HrHw_  
 }  }de {-  
 return bAdded; Yq6e=?-  
} <sALA~p|0  
7Rba@ cs9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Xjy5Yj  
{ U?bQBHIC  
 BOOL bRemoved=FALSE; *{t]fds  
 for(int index=0;index<MAX_KEY;index++){ EO&PabZWR  
  if(hCallWnd[index]==hWnd){ <|!?V"`3  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ pk%%}tP<  
    hCallWnd[index]=NULL; [tKH'}/s=  
    HotKey[index]=0; k10g %K4g  
    HotKeyMask[index]=0; 9BZyCz  
    bRemoved=TRUE; FO"sE`  
    KeyCount--; Qj1q x;S  
    break; Jv,*rQH  
   } ^\ N@qL  
  } #~_ZG% u  
 } |61W-9;  
 return bRemoved; 5f~49(v]  
} pR3@loFQ`o  
>@Nn_d  
void VerifyWindow() m-< "`:+  
{ X,] E {  
 for(int i=0;i<MAX_KEY;i++){ LU-,B?1  
  if(hCallWnd!=NULL){ gB3Tz(!  
   if(!IsWindow(hCallWnd)){ 4Y2!q$}I+  
    hCallWnd=NULL; 8|z@"b l)  
    HotKey=0; lU`}  
    HotKeyMask=0; H%peE9>$  
    KeyCount--; !Ojf9 6is  
   } (bX77 Xr  
  } 'lsG?  
 } !OCb^y  
} \CY_nn|&g  
ujLz<5gKuO  
BOOL CHookApp::InitInstance() 7f$ hg8  
{ T{USzMj  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); R_vF$X'Ow  
 hins=AfxGetInstanceHandle(); \y7kb  
 InitHotkey(); ;kX:k~,]}>  
 return CWinApp::InitInstance(); %Kk MWl&:  
} Rk8oshS+2  
QY^v*+lr\  
int CHookApp::ExitInstance() >" &&,~  
{ mRECd Gst  
 VerifyWindow(); 6EX_IDb  
 UnInit(); ,\DSi&T  
 return CWinApp::ExitInstance(); !,(6uO%  
} 8mmHefZ}2!  
yUyx&Y/  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file +o4W8f=Ga  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) sTb@nrRxH  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Xi:y35q  
#if _MSC_VER > 1000 1.U9EuI  
#pragma once @ptE&m  
#endif // _MSC_VER > 1000 M[= #%U3*N  
 EOn[!  
class CCaptureDlg : public CDialog Pf,lZU?f  
{ ]\.3<^  
 // Construction 3G.-JLhs  
 public: smJ#.I6/L  
  BOOL bTray; O$K?2-  
  BOOL bRegistered; V6CRl&ZKO  
  BOOL RegisterHotkey(); wn&5Ul9Elb  
  UCHAR cKey; UNC%<=  
  UCHAR cMask; ju8DmC5  
  void DeleteIcon(); x\R%hGt  
  void AddIcon();  j1sgvh]D  
  UINT nCount; [b?[LK}.  
  void SaveBmp(); ?r%kif)  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor jgyXb5GY  
  // Dialog Data skeXsls  
  //{{AFX_DATA(CCaptureDlg) H!81Pq~  
  enum { IDD = IDD_CAPTURE_DIALOG }; V49[XX  
  CComboBox m_Key; p(8[n^~,i  
  BOOL m_bControl; B7u4e8(E*  
  BOOL m_bAlt; t*Xo@KA  
  BOOL m_bShift; q=J8SvSRl  
  CString m_Path; hgmo b"o  
  CString m_Number; Z{ AF8r  
  //}}AFX_DATA "Xz[|Xl  
  // ClassWizard generated virtual function overrides b-"kclK  
  //{{AFX_VIRTUAL(CCaptureDlg) mR1|8H!f  
 public: EqjaD/6Y`  
  virtual BOOL PreTranslateMessage(MSG* pMsg); }R\;htmc;  
 protected: \Q~HL_fy|Y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support LPRvzlY=  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); R/|2s  
  //}}AFX_VIRTUAL +p\+ 15  
  // Implementation +ak<yV1=  
 protected: "/~KB~bB  
  HICON m_hIcon; r/e} DYL&  
  // Generated message map functions )C^@U&h&  
  //{{AFX_MSG(CCaptureDlg) ol#4AU`  
  virtual BOOL OnInitDialog(); so]p1@K  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); RX cfd-us  
  afx_msg void OnPaint(); -nL!#R{e  
  afx_msg HCURSOR OnQueryDragIcon(); X[;-SXq  
  virtual void OnCancel(); d+iV19#i  
  afx_msg void OnAbout(); +)06*"I  
  afx_msg void OnBrowse(); ./r#\X)dc  
  afx_msg void OnChange(); 8IQqDEY^  
 //}}AFX_MSG '#ow 9w+^  
 DECLARE_MESSAGE_MAP() -n#fj;.2_  
}; 1<n'F H3  
#endif j3$\+<m]  
Ae3=o8p  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file tsys</E&  
#include "stdafx.h" "NOll:5"(  
#include "Capture.h" %'3Y?d  
#include "CaptureDlg.h" }u&,;]  
#include <windowsx.h> -q")qNt.  
#pragma comment(lib,"hook.lib") 1!"iN~  
#ifdef _DEBUG T{B\1|2w  
#define new DEBUG_NEW J!"#N}[  
#undef THIS_FILE <%ZlJ_cM  
static char THIS_FILE[] = __FILE__; C%T$l8$  
#endif \*i[m&3;q  
#define IDM_SHELL WM_USER+1 ZhnRsn9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); FrL ;1zt  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #_9Jam%M  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Nxr%xTD  
class CAboutDlg : public CDialog {Hr P;)  
{ 5y8ajae:  
 public: e00s*LdC  
  CAboutDlg(); gg+!e#-X  
  // Dialog Data DMpNm F>  
  //{{AFX_DATA(CAboutDlg) *;!p#qL  
  enum { IDD = IDD_ABOUTBOX }; c[zaYcbl  
  //}}AFX_DATA &$<7]a\dM  
  // ClassWizard generated virtual function overrides +|c1G[Jh  
  //{{AFX_VIRTUAL(CAboutDlg) eGE[4Z  
 protected: b 8~7C4  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 'joE-{  
  //}}AFX_VIRTUAL {+  @M!  
  // Implementation 3Jj 3!aDB  
 protected: ^oH!FN`;{  
  //{{AFX_MSG(CAboutDlg) Fb^f`UI  
  //}}AFX_MSG k.K;7GZC  
  DECLARE_MESSAGE_MAP() m14OPZ<3?-  
}; %5-   
-xMM}r y  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5lYzgt-oP  
{ ?<h|Q~JH  
 //{{AFX_DATA_INIT(CAboutDlg) c3X8Wi7m  
 //}}AFX_DATA_INIT csCi0'u  
} .~jn N  
H;kk:s'  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) AiOz1Er  
{ fF.qQTy;7  
 CDialog::DoDataExchange(pDX); 0OF]|hH  
 //{{AFX_DATA_MAP(CAboutDlg) 5nh:S0M6V  
 //}}AFX_DATA_MAP g'nN#O  
} S/H!a:_5r  
{q^?Rw  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) J]mq|vE  
 //{{AFX_MSG_MAP(CAboutDlg) M F_VMAq  
 // No message handlers O$$$1VHYo  
 //}}AFX_MSG_MAP ; w+<yW}EL  
END_MESSAGE_MAP() ,W:Bh$%  
ns;nle|m  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) bP3S{Jt-|  
: CDialog(CCaptureDlg::IDD, pParent) Qe;j_ BH  
{ q@8j[15  
 //{{AFX_DATA_INIT(CCaptureDlg) avwhGys#  
  m_bControl = FALSE; QJKVNOo  
  m_bAlt = FALSE; ;VI W/  
  m_bShift = FALSE; I15g G.)  
  m_Path = _T("c:\\"); {H$m1=S  
  m_Number = _T("0 picture captured."); ?~fuMy B  
  nCount=0; o^b4l'&o  
  bRegistered=FALSE; L7 f'  
  bTray=FALSE; WTZr{)e  
 //}}AFX_DATA_INIT 2%oo.?!R  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 q[T='!Z\  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); f[$9k}.  
} Kk t9M\  
W$_@9W(Bl  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) G: p!PB>=  
{ {S;/+X,  
 CDialog::DoDataExchange(pDX); +w'{I`QIL0  
 //{{AFX_DATA_MAP(CCaptureDlg) 1XvB,DhJ  
  DDX_Control(pDX, IDC_KEY, m_Key); |e#ea~/b  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); q,H 0=\  
  DDX_Check(pDX, IDC_ALT, m_bAlt); c7$U0JO  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); //\UthOT  
  DDX_Text(pDX, IDC_PATH, m_Path); ?]bZ6|;2  
  DDX_Text(pDX, IDC_NUMBER, m_Number); #H1ng<QV  
 //}}AFX_DATA_MAP Nq3q##Ut:  
} MX.=k>  
m+Bt9|d  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) h0)Wy>B=,  
//{{AFX_MSG_MAP(CCaptureDlg) 0W1=9+c|X  
 ON_WM_SYSCOMMAND() pdQ6/vh  
 ON_WM_PAINT() L>qLl_.  
 ON_WM_QUERYDRAGICON() *0aU(E #  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 7k>sE  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Wi?37EHr  
 ON_BN_CLICKED(ID_CHANGE, OnChange) k 8Swra?j  
//}}AFX_MSG_MAP 8yDu(.Q  
END_MESSAGE_MAP() YLfZ;W|6u  
%kg%ttu7  
BOOL CCaptureDlg::OnInitDialog() !a[1rQH  
{ ~Z'3(n*9  
 CDialog::OnInitDialog(); N?'V,p 0=  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ,\FJVS;NeJ  
 ASSERT(IDM_ABOUTBOX < 0xF000); IaU  
 CMenu* pSysMenu = GetSystemMenu(FALSE); M)U 32gI:  
 if (pSysMenu != NULL) #.(6.Li  
 { 7O)U(<70  
  CString strAboutMenu; :(|;J<R%_  
  strAboutMenu.LoadString(IDS_ABOUTBOX); JRm:hf'  
  if (!strAboutMenu.IsEmpty()) T{iv4`'  
  { 8W]6/st?]  
   pSysMenu->AppendMenu(MF_SEPARATOR); pOCLyM9c  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ueiXY|  
  } I]]3=?Y  
 } 1>"K<6b+  
 SetIcon(m_hIcon, TRUE); // Set big icon A&2)iQ  
 SetIcon(m_hIcon, FALSE); // Set small icon CE$c/d[N.  
 m_Key.SetCurSel(0); wPn#>\/L  
 RegisterHotkey(); - T,;Fr'  
 CMenu* pMenu=GetSystemMenu(FALSE); |8$x  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); \S)\~>.`y!  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); NY'sZTM&  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); T'cahkSw'O  
 return TRUE; // return TRUE unless you set the focus to a control T #&9|  
} L44/eyrp  
3+<}Hm+  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 8xQ5[Ov  
{ zUM;Qwl  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) >5&'_  
 { (I d]'w4  
  CAboutDlg dlgAbout; af61!?K  
  dlgAbout.DoModal(); ey@]B5  
 } o yBBW?m  
 else ;~$_A4;  
 { Hb KJ&^  
  CDialog::OnSysCommand(nID, lParam); gL(ny/Ob9  
 } &i8AB{OU  
} Y. ]FVq  
4+od N.  
void CCaptureDlg::OnPaint() y#:_K(A" k  
{ krPwFp2[*  
 if (IsIconic()) )QGj\2I  
 { c|lo%[]R!  
  CPaintDC dc(this); // device context for painting 1f]04TI  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); x1\,WOrmK  
  // Center icon in client rectangle $!L'ZO1_r  
  int cxIcon = GetSystemMetrics(SM_CXICON); 3[E3]]OVa  
  int cyIcon = GetSystemMetrics(SM_CYICON); .v36xXK(  
  CRect rect; J#7\R':}zl  
  GetClientRect(&rect); 5Xu2MY=  
  int x = (rect.Width() - cxIcon + 1) / 2; M-3kF"  
  int y = (rect.Height() - cyIcon + 1) / 2; IcMfZ {H1  
  // Draw the icon {)j3Pn  
  dc.DrawIcon(x, y, m_hIcon); `H6-g=C  
 } wK+%[i&,  
 else N/QTf1$  
 { Z~o6%_xe  
  CDialog::OnPaint(); Y]aVa2!Wb  
 } 7t7"glP  
} *p}b_A}D  
<(dHh9$~  
HCURSOR CCaptureDlg::OnQueryDragIcon() )<bgZ, v  
{ sK8=PZ \  
 return (HCURSOR) m_hIcon; 7F OG^  
} )$XW~oA'  
S>isWte  
void CCaptureDlg::OnCancel() 7U> Xi'?  
{ ;uj&j1  
 if(bTray) C?jk#T  
  DeleteIcon(); Q H:k5V~  
  CDialog::OnCancel(); j^#4!Ue  
} "c8 -xG  
P(BjXMd  
void CCaptureDlg::OnAbout() W($}G_j[B1  
{ dWbSrl  
 CAboutDlg dlg; ocCq$%Ka  
 dlg.DoModal(); lXH?*  
} 84v7g`lrR  
#9-qF9M  
void CCaptureDlg::OnBrowse() Vmq:As^a  
{ mw2/jA7  
 CString str; 04ZP\  
 BROWSEINFO bi; dU`kJ,=Z  
 char name[MAX_PATH]; Ws%@SK  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 86pujXjc'  
 bi.hwndOwner=GetSafeHwnd(); hKVj\88  
 bi.pszDisplayName=name; 8S*3W3HY  
 bi.lpszTitle="Select folder"; }LK +w+h~  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ?=zF]J:G1w  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); h9<*+T  
 if(idl==NULL) L'(ei7Z  
  return; PkM]jbLe8  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Hw"Lo Vh  
 str.ReleaseBuffer(); v@m2c_,  
 m_Path=str; sz;B-1^6  
 if(str.GetAt(str.GetLength()-1)!='\\') ykAZP[^'  
  m_Path+="\\"; Ruy qB>[o  
 UpdateData(FALSE); 'W'['TV  
}  zciL'9  
d$DNiJ ,  
void CCaptureDlg::SaveBmp() jQ>~  
{ $K& #R-  
 CDC dc; '" MT$MrT  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); B^|^hZZ>  
 CBitmap bm; CMu/n]?c  
 int Width=GetSystemMetrics(SM_CXSCREEN); @fz0-vT,  
 int Height=GetSystemMetrics(SM_CYSCREEN); Z`jc*jgy  
 bm.CreateCompatibleBitmap(&dc,Width,Height); $2!|e,x  
 CDC tdc; ;t6)(d4z?  
 tdc.CreateCompatibleDC(&dc); }EJAC*W,  
 CBitmap*pOld=tdc.SelectObject(&bm); B\WIoz;'  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 3m;*gOLk6  
 tdc.SelectObject(pOld); #bIUO2yVo  
 BITMAP btm; b*5Yy/U  
 bm.GetBitmap(&btm); MBp,! _Q6  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; :~"Dwrui  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); X(r$OZ  
 BITMAPINFOHEADER bih; \US'tF)/  
 bih.biBitCount=btm.bmBitsPixel; ~)fd+~4L  
 bih.biClrImportant=0; &];:uYmMU  
 bih.biClrUsed=0; 5xb1FH d:  
 bih.biCompression=0; 6gy;Xg  
 bih.biHeight=btm.bmHeight; s?j||  
 bih.biPlanes=1;  b79z<D  
 bih.biSize=sizeof(BITMAPINFOHEADER); xZ\`f-zL  
 bih.biSizeImage=size; ]K<mkUpY  
 bih.biWidth=btm.bmWidth; n0 q$/Y.  
 bih.biXPelsPerMeter=0; zWA~0l.2  
 bih.biYPelsPerMeter=0; ~;AJB  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ?xTdL738  
 static int filecount=0; -a+oQP]O  
 CString name; jhx@6[  
 name.Format("pict%04d.bmp",filecount++); bnZ`Wc*5b  
 name=m_Path+name; c{(4s6D  
 BITMAPFILEHEADER bfh; ^`*p;&(K\^  
 bfh.bfReserved1=bfh.bfReserved2=0; -dO9y=?t  
 bfh.bfType=((WORD)('M'<< 8)|'B'); `VL<pqPP  
 bfh.bfSize=54+size; >|W\8dTQ  
 bfh.bfOffBits=54; :c/](M  
 CFile bf; u27*-X 5  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ g[D `.  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); u^X,ASkQ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); e b*w$|y6"  
  bf.WriteHuge(lpData,size); HUWCCVn&  
  bf.Close(); N*{>8iFo4  
  nCount++; 7nl  
 } gZ 6Hj62D  
 GlobalFreePtr(lpData); @\)a&p]a  
 if(nCount==1) }'c@E0"  
  m_Number.Format("%d picture captured.",nCount); z@tIC^s  
 else y&(R1Y75  
  m_Number.Format("%d pictures captured.",nCount); p}K\rpvJpu  
  UpdateData(FALSE); $ 0Up.  
} s9 .nU  
<x->.R_  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) EG oe<.  
{ 6i=Nk"d  
 if(pMsg -> message == WM_KEYDOWN) /OsTZ"*.2/  
 {  1k39KO@  
  if(pMsg -> wParam == VK_ESCAPE) ]/TqPOi:  
   return TRUE; K[Ao_v2g  
  if(pMsg -> wParam == VK_RETURN) =>u9k:('9  
   return TRUE; ];7/DM#Np  
 } 48W-Tf6v|  
 return CDialog::PreTranslateMessage(pMsg); B`;DAsmT  
} =7P(T`j  
EwuBL6kN  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ATq-&1hs  
{ <f/wWu}  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 4K<T_B/  
  SaveBmp(); `mo>~c7  
  return FALSE; w@Gk#  
} 6H:'_|G  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ^[u*m%UB  
 CMenu pop; ;=oGg%@aP  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Jz Z9ua  
 CMenu*pMenu=pop.GetSubMenu(0); ]Yd7  
 pMenu->SetDefaultItem(ID_EXITICON); @"$rR+r'  
 CPoint pt; 5^GFN*poig  
 GetCursorPos(&pt); .0H!B#9  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 8C4 =f  
 if(id==ID_EXITICON) _0c$SK  
  DeleteIcon(); |&xjuBC  
 else if(id==ID_EXIT) D-!#TN`Y  
  OnCancel(); %\n&iRwDF  
 return FALSE; $v*0 \O  
} 5q>u]n9]  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); |Je+y;P7  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) kFi^P~3D[  
 AddIcon(); DHO+JtO  
 return res; sJ(q.FRM'  
} ?=lnYD j  
!s:v UY58  
void CCaptureDlg::AddIcon() @N0(%o&  
{ `+go| 5N2  
 NOTIFYICONDATA data;  GP/G v  
 data.cbSize=sizeof(NOTIFYICONDATA); d PfD Pb  
 CString tip; R.+yVO2  
 tip.LoadString(IDS_ICONTIP); {<_9QAS  
 data.hIcon=GetIcon(0); iTq~ ^9G  
 data.hWnd=GetSafeHwnd(); hm5A@Z   
 strcpy(data.szTip,tip); )xMP  
 data.uCallbackMessage=IDM_SHELL; 8;r7ksE~  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; gUq)M  
 data.uID=98; {=Ku9\  
 Shell_NotifyIcon(NIM_ADD,&data); v8L&F9 o  
 ShowWindow(SW_HIDE); +v}R-gNR  
 bTray=TRUE; (KDv>@5  
} w'b|*_Q4Q  
)5M9Ro7  
void CCaptureDlg::DeleteIcon() /`Wd+  
{ .+"SDt oX  
 NOTIFYICONDATA data; ecI[lB  
 data.cbSize=sizeof(NOTIFYICONDATA); E*t0ia8  
 data.hWnd=GetSafeHwnd(); &_!g|-  
 data.uID=98; }813.U  
 Shell_NotifyIcon(NIM_DELETE,&data);  8/|~E  
 ShowWindow(SW_SHOW); oQvG3(.  
 SetForegroundWindow();  xedbr  
 ShowWindow(SW_SHOWNORMAL); h""a#n)q}`  
 bTray=FALSE; @e/40l|X  
} G)E#wh_S^  
Y}C~&Ph  
void CCaptureDlg::OnChange() x_3Zd  
{ $]05?JY#  
 RegisterHotkey(); X|WAUp?  
} V %cU @  
32f lOi:  
BOOL CCaptureDlg::RegisterHotkey() 3t4_{']:/  
{ -pRyN]YD  
 UpdateData(); h4GR:`  
 UCHAR mask=0; fi[c^e+IX  
 UCHAR key=0; wghz[qe  
 if(m_bControl) f(O`t}Ed  
  mask|=4; ;NrkX?Y  
 if(m_bAlt) ='7n  
  mask|=2; I!)gXtJA"  
 if(m_bShift) !@_( W   
  mask|=1; at/v.U |F  
  key=Key_Table[m_Key.GetCurSel()]; <N%8"o  
 if(bRegistered){ o%Lk6QA$  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); TXi$Q%0W  
  bRegistered=FALSE; s q_N!  
 } j${:Y$VmE  
 cMask=mask; ,uD>.->  
 cKey=key; c?0uv2*Yh  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); X,/@#pSOz  
 return bRegistered; >?,arER  
} mmXLGLMd  
eB:obz  
  四、小结 qVFz-!6b  
%>uGzQ61  
  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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