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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: 1 /M^7Vb.  
  /vSGmW-*  
  一、实现方法 `K{}  
1>Sfv|ZP,  
  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: )'+[,z ;s  
2;v:Z^&  
#pragma data_seg("shareddata") w+)${|N?  
HHOOK hHook =NULL; //钩子句柄 <:9 ts@B  
UINT nHookCount =0; //挂接的程序数目 .LDZqWr-  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 +e{ui +  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 fd'kv  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey +``vnC  
static int KeyCount =0; ]}L'jK 0  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 T!c|O3m  
#pragma data_seg() cGlN*GJ*H  
+#Pb@^6"m  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ##jJa SxG  
Nf] ?hfJ  
  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: ;fNCbyg4 I  
$s7U |F,I  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR j\ y!  
cKey,UCHAR cMask) t% qep|  
{ _.s ,gX  
 BOOL bAdded=FALSE; Qt.*Z;Gs  
 for(int index=0;index<MAX_KEY;index++){ b/S:&%E  
  if(hCallWnd[index]==0){ spa :5]B  
   hCallWnd[index]=hWnd; 6e ?xu8|  
   HotKey[index]=cKey; ED` 1)1<  
   HotKeyMask[index]=cMask; 7KIekL  
   bAdded=TRUE; y0xBNhev  
   KeyCount++; >=N-P< %  
   break; DT]4C!dh  
  } VIF43/>(  
 } U"Gx Xrl  
 return bAdded; KrGl}|  
} wpZ"B+oK!  
//删除热键 1M`E.Ztw*  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $Tbsre\MJ  
{ 5;)^o3X>  
 BOOL bRemoved=FALSE; S`s]zdUTP  
 for(int index=0;index<MAX_KEY;index++){ u9"kF  
  if(hCallWnd[index]==hWnd){ :rb;*nY!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ c,1  G+.  
    hCallWnd[index]=NULL; ?Bu*%+  
    HotKey[index]=0; }b1G21Dc!  
    HotKeyMask[index]=0; !>9s  
    bRemoved=TRUE; H'WYnhU&  
    KeyCount--; (_pw\zk>  
    break; l#[Z$+!09  
   } (HRj0,/^  
  } yY#h 1  
 } EXSJ@k6=8s  
 return bRemoved; }c8nn  
} _^_3>}y5op  
og";mC  
O\<zQ2m  
  DLL中的钩子函数如下: )BJkHED{  
6:8s,a3&[k  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) GN_L"|#)=  
{ e|k]te  
 BOOL bProcessed=FALSE; Zn9u&!T&  
 if(HC_ACTION==nCode) Wc@ ,#v  
 { h7Uj "qH  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 f#ZM 2!^!  
   switch(wParam) T<*)Cdid  
   {  94B%_  
    case VK_MENU: KS*,'hvY  
     MaskBits&=~ALTBIT; 5t%8y!s  
     break; Fip 5vrD  
    case VK_CONTROL: l,o'J%<%  
     MaskBits&=~CTRLBIT; =q VT  
     break; HO<|EH~lu  
    case VK_SHIFT: I(M/ X/  
     MaskBits&=~SHIFTBIT; uX-^ 9t  
     break; =d Q[I6  
    default: //judge the key and send message uGZGI;9f4  
     break; xgxfPcI  
   }  T7nI/y  
   for(int index=0;index<MAX_KEY;index++){ gGP6"|tc4  
    if(hCallWnd[index]==NULL) (xo`*Q,+  
     continue; !H\;X`W|~D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1 iox0  
    { 3@" :&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); M-t 9M~  
     bProcessed=TRUE; ,P9F*;Dj  
    } $IQPB_:  
   } *6yY>LW  
  } fnq 3ic"V  
  else if((lParam&0xc000ffff)==1){ //有键按下 [)V~U?  
   switch(wParam) nT?+^Ruc  
   { 2OoANiX  
    case VK_MENU: ?pZ"7kkD  
     MaskBits|=ALTBIT; _#V&rY&@  
     break; E3 % ~!ZC  
    case VK_CONTROL: brmS J7  
     MaskBits|=CTRLBIT; %?[gBf[y  
     break; c!E{fSP  
    case VK_SHIFT: g-K;J4 K%  
     MaskBits|=SHIFTBIT; cg{5\ Vl  
     break; #TNjQNg@O  
    default: //judge the key and send message T^4 dHG-(  
     break; ;B@#,6t/  
   } 4~Qnhv7  
   for(int index=0;index<MAX_KEY;index++){ y#a,d||N1  
    if(hCallWnd[index]==NULL) n#6{K6}k~  
     continue; PE5*]+lW.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Z5xQ -T`  
    { DinZ Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ZbC$Fk,,I&  
     bProcessed=TRUE; lG-B) F  
    } <}lah%4F  
   } (m'-1wX.  
  } #HV5M1mb  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 H5 z1_O_+  
   for(int index=0;index<MAX_KEY;index++){ X{x(p  
    if(hCallWnd[index]==NULL) ;h1hz^Wq  
     continue; Tz)Ku  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ,marNG  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); )5( jx  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 \lG)J0  
   } oJD]h/fQs  
  } $9?:P}$v  
 } x_~_/&X5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); WOn<JCh]  
} curYD~7  
oaQW~R`_  
  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: (eF[nfM  
QcrhgR  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'ge$}L}4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); aB6/-T+ u  
f_)#  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: s=:)!M.i  
6hj[/O)E  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Y-bTKSn  
{ ?;oJ=.T  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) `xx.,;S  
 { pnuo;rs  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 (W#CDw<ja  
  SaveBmp(); 4 xqzdR_  
  return FALSE; 0 7Yak<+~  
 } w)|9iL8  
 …… //其它处理及默认处理 pfZ[YC-  
} ]A}ZaXd  
'4M{Xn}@  
m!KEK\5M?  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 3UXZ|!-  
g$NUu  
  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。 x:0swZ5Z  
Gx$m"Jeq\  
  二、编程步骤 d;<'28A  
F5X9)9S  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; j5DCc,s  
C7F\Y1Wj  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; OCu_v%G 0  
T;3qE1c  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; FS 5iUH+5  
]2l}[ w71|  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; "8%$,rG1&  
Zj -#"Gm  
  5、 添加代码,编译运行程序。 wlP3 XF?  
o@N[O^Q V  
三、程序代码 7vXP|8j  
ll0y@@Iy  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL `Kg!aN  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) v {r%/*  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ $gnrd~v4e  
#if _MSC_VER > 1000 {96MfhkeBv  
#pragma once :[+8(~| za  
#endif // _MSC_VER > 1000 [ >mH  
#ifndef __AFXWIN_H__ D} B?~Lls  
#error include 'stdafx.h' before including this file for PCH ~ Rk.x +  
#endif |=ph&9  
#include "resource.h" // main symbols @p~scE.#\  
class CHookApp : public CWinApp 6O,k! y>  
{ #w%-IhP  
 public: V|@bITJ?7  
  CHookApp(); N {{MMIq  
  // Overrides 0^tY|(b3/M  
  // ClassWizard generated virtual function overrides E`.hM}h  
  //{{AFX_VIRTUAL(CHookApp) D N)o|p  
 public: Xg]Cq"RJC  
  virtual BOOL InitInstance(); Rd7U5MBEF  
  virtual int ExitInstance(); lx4p Tw1  
  //}}AFX_VIRTUAL q#AIN`H  
  //{{AFX_MSG(CHookApp) 9]Ue%%vM  
  // NOTE - the ClassWizard will add and remove member functions here. h STcL:b   
  // DO NOT EDIT what you see in these blocks of generated code ! ;o'r@4^&$R  
  //}}AFX_MSG CyLwCS{V\  
  DECLARE_MESSAGE_MAP() (/nnN4\=  
}; DzMg^Kp  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); E9mu:T  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'm`}XGUBS  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); . s>@@m-  
BOOL InitHotkey(); K" VcPDK  
BOOL UnInit(); 5?H wM[`  
#endif 9,~7,Py}  
}wRm ~  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. @gb W:  
#include "stdafx.h" w>cqsTq  
#include "hook.h" Wcc4/:`Hu  
#include <windowsx.h> SF-E>s!XL  
#ifdef _DEBUG D'u7"^=  
#define new DEBUG_NEW l0^cdl-  
#undef THIS_FILE ,vmn{gz  
static char THIS_FILE[] = __FILE__; )bih>>H  
#endif ~b*]jZwT  
#define MAX_KEY 100 /0qbRk i  
#define CTRLBIT 0x04 p~3 x=X4  
#define ALTBIT 0x02 0ZwXuq  
#define SHIFTBIT 0x01 ;8XRs?xyd  
#pragma data_seg("shareddata") a(6h`GHo  
HHOOK hHook =NULL; @*<0:Q|m  
UINT nHookCount =0; D|Q7dIZm  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey al}J^MJ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT L!*+: L DL  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ?Xvy0/s5  
static int KeyCount =0; #S9J9k  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift {|>Wwa2e  
#pragma data_seg() XQn1B3k+  
HINSTANCE hins; %m dtVQ@  
void VerifyWindow(); J;Z2<x/H  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) O<Q8%Az  
//{{AFX_MSG_MAP(CHookApp) g(tVghHxt$  
// NOTE - the ClassWizard will add and remove mapping macros here. M1WD^?tKQ.  
// DO NOT EDIT what you see in these blocks of generated code! z]rr Q=dAA  
//}}AFX_MSG_MAP .B<Bqr@?8  
END_MESSAGE_MAP() +@^);b6  
Z5(9=8hB/  
CHookApp::CHookApp() wHs1ge(  
{ ws9IO ?|&G  
 // TODO: add construction code here, L$3lsu!4n  
 // Place all significant initialization in InitInstance ? -:2f#bC  
} 11"r FZ  
W9w*=W )Z  
CHookApp theApp; @ :Zk,   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) P~{8L.w!>W  
{ }NyQ<,+mq&  
 BOOL bProcessed=FALSE; ,k~' S~w.  
 if(HC_ACTION==nCode) 1UJrPM%  
 { 5\z<xpJ  
  if((lParam&0xc0000000)==0xc0000000){// Key up -->0e{y  
   switch(wParam) CnL=s6XD'  
   { H}kSXKO8!8  
    case VK_MENU: /a^ R$RHl'  
     MaskBits&=~ALTBIT; 8 5ET$YV  
     break; qJ`:$U  
    case VK_CONTROL: \X&8EW  
     MaskBits&=~CTRLBIT; % Q6 za'25  
     break; LWJ ?p-X  
    case VK_SHIFT: ^K"BQ~-w  
     MaskBits&=~SHIFTBIT; $O*@Jg=  
     break; {rR(K"M  
    default: //judge the key and send message }r@dZ Bp:  
     break; O%kUj&h^  
   } Gu~*ZKyJ  
   for(int index=0;index<MAX_KEY;index++){ aA#79LS  
    if(hCallWnd[index]==NULL) ~5&4s  
     continue; AcuF0KWw/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ="YGR:  
    { B }%2FUv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); mTI`^e  
     bProcessed=TRUE; o5a=>|?p>  
    } _xv3UzD  
   } exhU!p8  
  } =w+8q1!o  
  else if((lParam&0xc000ffff)==1){ //Key down GqRXNs!  
   switch(wParam) FiiDmhu  
   { GKo&?Tj)  
    case VK_MENU: o:Kw<z,$H  
     MaskBits|=ALTBIT; L_Gw:"-+Q  
     break; z4SJxL  
    case VK_CONTROL: TC/c5:)]  
     MaskBits|=CTRLBIT; A_9^S!  
     break; ]S&ki}i&  
    case VK_SHIFT: ]w6Q?%'9  
     MaskBits|=SHIFTBIT; =^u;uS[IW  
     break; J;obh.}u"{  
    default: //judge the key and send message dW4jkjap  
     break; [y@*vQw  
   } =|P &G~]  
   for(int index=0;index<MAX_KEY;index++) [o#% Eg;  
   { @5nFa~*K%  
    if(hCallWnd[index]==NULL) I2*rtVAP'j  
     continue; zw+aZDcV(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) q_.fVn:!  
    { ~)ys,Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); m@Yc&M~  
     bProcessed=TRUE; _aPAn|.  
    } =lJ ?yuc  
   } /j GBQ-X  
  } @M"gEeI9  
  if(!bProcessed){ /dYv@OU?  
   for(int index=0;index<MAX_KEY;index++){ l@B9}Icq  
    if(hCallWnd[index]==NULL) V,_m>$Mo  
     continue; DD$> 3`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) GVXdyi  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); G@H!D[wd  
   } |2q3spd  
  } AVpg  
 } ]Orx %8QS!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); g&FTX>wX  
} *(Dmd$|0|  
u)0I$Tc"  
BOOL InitHotkey() <R$ 2x_  
{ N;|^C{uz  
 if(hHook!=NULL){ ]j*2PSJG  
  nHookCount++; Lg7A[\c ~  
  return TRUE; EhHxB fAQ  
 } m]2xOR_  
 else GkJcd;  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 3^y(@XFt  
  if(hHook!=NULL) @zg}x0]  
   nHookCount++; hN'])[+V  
  return (hHook!=NULL); Tsg9,/vXM  
} XH!#_jy  
BOOL UnInit() p' >i3T(  
{ .ImaM  
 if(nHookCount>1){ [7v|bd  
  nHookCount--; W r/-{Wt  
  return TRUE; lv 8EfN  
 } -)}s{[]d6m  
 BOOL unhooked = UnhookWindowsHookEx(hHook); sE"s!s/  
 if(unhooked==TRUE){ sP(+Z^/  
  nHookCount=0; O{LCHtN  
  hHook=NULL; K29/7A/  
 } C27:ty V  
 return unhooked; !?>V^#c  
} EraGG"+  
y>a?<*Y+e  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) y'_8b=*  
{ ^AP8T8v  
 BOOL bAdded=FALSE; X .t4;  
 for(int index=0;index<MAX_KEY;index++){ q?(] Y*  
  if(hCallWnd[index]==0){ ]1!" q40)]  
   hCallWnd[index]=hWnd; 3%Y:+%VE  
   HotKey[index]=cKey; jfuHZ^YA  
   HotKeyMask[index]=cMask; >7>I1  
   bAdded=TRUE; AYbO~_a\N  
   KeyCount++; "313eeIt%i  
   break; |H5.2P&9-5  
  } I/f\m}}ba  
 } So aqmY;+  
 return bAdded; Op'a=4x]  
} CFaY=Cy  
OBWWcL-  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @RoZd?  
{ ^LMgOA(7  
 BOOL bRemoved=FALSE; ~Bzzu % S  
 for(int index=0;index<MAX_KEY;index++){ bKo %Ak,  
  if(hCallWnd[index]==hWnd){ 8 t5kou]h  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 11=$] K>  
    hCallWnd[index]=NULL; 'X?xn@?  
    HotKey[index]=0; xl\Kj2^  
    HotKeyMask[index]=0; m^_=^z+  
    bRemoved=TRUE; Jxe+LG  
    KeyCount--; ~K;QdV=YX  
    break; c2npma]DZ  
   } tq3_az ~1  
  } ;m(iKwDt  
 } C ^Y\?2h1  
 return bRemoved; ~ nsb  
} 4V,.Oi  
gF)9a_R%p  
void VerifyWindow() "%-Vrb=:Y  
{ wX,V:QE  
 for(int i=0;i<MAX_KEY;i++){ ffrIi',@  
  if(hCallWnd!=NULL){ {OU|'  
   if(!IsWindow(hCallWnd)){ 8`q7Yss6F  
    hCallWnd=NULL; TekUY m!G  
    HotKey=0; _Iy\,<  
    HotKeyMask=0; 8%[pno |0I  
    KeyCount--; @Wu-&Lb  
   } _;1{feR_  
  } iM+` 7L'  
 } =kd$??F  
} -pu5O 9 @  
^xZh@e5  
BOOL CHookApp::InitInstance() HK@ij,px  
{ .Bm%  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); [xMa^A>p  
 hins=AfxGetInstanceHandle(); ( ay AP  
 InitHotkey(); [?!I*=*b  
 return CWinApp::InitInstance(); 6}4})B2  
} wcGK *sWG-  
S#/%#k103  
int CHookApp::ExitInstance() pO` KtagL  
{ P49\A^5S!  
 VerifyWindow(); @+u>rS|IB  
 UnInit(); OK [J h  
 return CWinApp::ExitInstance(); PVCoXOqh  
} ;P@]7vkff  
>Fel) a  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file </h^%mnd  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) COrk (V  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Rr )+M3'  
#if _MSC_VER > 1000 Jz@~$L  
#pragma once (`P\nnb  
#endif // _MSC_VER > 1000 lPTx] =G  
[0H0%z#tU&  
class CCaptureDlg : public CDialog oo5=5s6 3}  
{ %q{q.(M#  
 // Construction d1 j9{  
 public: M;(,0dk  
  BOOL bTray; UiFH*HT  
  BOOL bRegistered; V`V\/s gj  
  BOOL RegisterHotkey(); =&HLz 7|  
  UCHAR cKey; J!I)G&:  
  UCHAR cMask; G-aR%]7$g  
  void DeleteIcon(); M+/xw8}a  
  void AddIcon(); 5(1:^:LGK  
  UINT nCount; -3I3 X  
  void SaveBmp(); Gz[yD ~6a  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor aB9!}3@  
  // Dialog Data 7u):J  
  //{{AFX_DATA(CCaptureDlg) rO1!h%&o"  
  enum { IDD = IDD_CAPTURE_DIALOG }; Uzu6>yT  
  CComboBox m_Key; [M?2axOC  
  BOOL m_bControl; ahB qYA K9  
  BOOL m_bAlt; V$^jlWdR  
  BOOL m_bShift; ]-fkmnmWX  
  CString m_Path; %,$n^{v  
  CString m_Number; m>>.N?  
  //}}AFX_DATA JAPr[O&  
  // ClassWizard generated virtual function overrides \;LDE`Q_x  
  //{{AFX_VIRTUAL(CCaptureDlg) L4#pMc  
 public: #&Sr;hAJ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); X#B b?Pv  
 protected: A4K.,bZ   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {$*N1$(%  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); |c_qq Bd  
  //}}AFX_VIRTUAL jc} G+|`  
  // Implementation !vnQ;g5  
 protected: vF$i"^;tJ;  
  HICON m_hIcon; :+rGBkw1m  
  // Generated message map functions 7s9h:/Lu  
  //{{AFX_MSG(CCaptureDlg) _7 3q,3`24  
  virtual BOOL OnInitDialog(); ,"(L2+Yp  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 7N.b-}$(  
  afx_msg void OnPaint(); >DqF>w.1  
  afx_msg HCURSOR OnQueryDragIcon(); 'M90Yia  
  virtual void OnCancel(); [6/ QUD8  
  afx_msg void OnAbout(); \ mqx '  
  afx_msg void OnBrowse(); M6Fo.eeK3  
  afx_msg void OnChange(); Q?{%c[s  
 //}}AFX_MSG U84W(X  
 DECLARE_MESSAGE_MAP() =YO ]m<  
}; 5j%G7.S\  
#endif 6 SSDc/  
f8 d 3ZK  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file AOf4y&B>q  
#include "stdafx.h" jG5HW*>k0  
#include "Capture.h" nB[-KS  
#include "CaptureDlg.h" nla6QlFYn*  
#include <windowsx.h> [}RoZB&I  
#pragma comment(lib,"hook.lib") Z:; }  
#ifdef _DEBUG 9>""xt  
#define new DEBUG_NEW 6_LeP9s )  
#undef THIS_FILE taQE r 2Zy  
static char THIS_FILE[] = __FILE__; k4TWfl^}9  
#endif D:)Wr, 26  
#define IDM_SHELL WM_USER+1 cs9^&N:w[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v9$!v^U"D  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]BQYVx/  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; r-2k<#^r  
class CAboutDlg : public CDialog {7o#Ve  
{ s0kp(t!fiu  
 public: S}m_XR]  
  CAboutDlg(); V7ph^^sC}  
  // Dialog Data : Mf"   
  //{{AFX_DATA(CAboutDlg) $Y$9]G":  
  enum { IDD = IDD_ABOUTBOX }; #el27"QP0  
  //}}AFX_DATA NE995;  
  // ClassWizard generated virtual function overrides iyskADS  
  //{{AFX_VIRTUAL(CAboutDlg) lOIk$"Ne  
 protected: >4 OXG7.&f  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support md!6@)S-p  
  //}}AFX_VIRTUAL 1GY2aZ@  
  // Implementation V5|ANt  
 protected: [U\?+@E*  
  //{{AFX_MSG(CAboutDlg) |"H 2'L$  
  //}}AFX_MSG S63 Zk0(25  
  DECLARE_MESSAGE_MAP() <v"o+  
}; )P$(]{  
3} A$+PX  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) N<EVs.7  
{ +)]YvZ6%[,  
 //{{AFX_DATA_INIT(CAboutDlg) $YYWpeW '  
 //}}AFX_DATA_INIT :Pud%}'  
} _IH" SVub  
rg/{5f  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) DwD$T%kF  
{ | HazM9=  
 CDialog::DoDataExchange(pDX); xO$P C,  
 //{{AFX_DATA_MAP(CAboutDlg) ?KT{H( rU  
 //}}AFX_DATA_MAP R1jl<=  
} pYO =pL^Q  
'CLZ7 pV  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) qnm_#!&uHT  
 //{{AFX_MSG_MAP(CAboutDlg) (8nv&|  
 // No message handlers h}b:-a  
 //}}AFX_MSG_MAP xNz(LZ.c  
END_MESSAGE_MAP() 1MelHW  
f| RmAP;X,  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) }xZi Ct  
: CDialog(CCaptureDlg::IDD, pParent) &&ioGy}1  
{ h8rW"8Th  
 //{{AFX_DATA_INIT(CCaptureDlg) Fu7:4+  
  m_bControl = FALSE; !, 4ag1  
  m_bAlt = FALSE; _Hb;)9y  
  m_bShift = FALSE; :1v,QEb\  
  m_Path = _T("c:\\"); |rmelQ-  
  m_Number = _T("0 picture captured."); kmB!NxF>)F  
  nCount=0; !^J;S%MB:K  
  bRegistered=FALSE; !iXRt")  
  bTray=FALSE; \1EuHQ?  
 //}}AFX_DATA_INIT b*|~F  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 7Z-j'pq  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Z%T Ajm  
} 9tiZIm93]  
_=v#"l  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) t0)1;aBZ  
{ 8`=?_zF  
 CDialog::DoDataExchange(pDX); 8&<:(mAP  
 //{{AFX_DATA_MAP(CCaptureDlg) rTD+7 )E  
  DDX_Control(pDX, IDC_KEY, m_Key); O"m7r ds  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); wjarQog5Y  
  DDX_Check(pDX, IDC_ALT, m_bAlt); =u~nLL  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Lx"GBEkt7  
  DDX_Text(pDX, IDC_PATH, m_Path); lH-VqkR\  
  DDX_Text(pDX, IDC_NUMBER, m_Number); )m%uSSx#  
 //}}AFX_DATA_MAP %1z;l.c  
} 'o$j~Mr  
{I#_0Q,i  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) J~~\0 u  
//{{AFX_MSG_MAP(CCaptureDlg) uo F.f$%"  
 ON_WM_SYSCOMMAND() ^$c#L1 C  
 ON_WM_PAINT() 16NHzAQ  
 ON_WM_QUERYDRAGICON() ?HEqv$n  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) F^ q{[Z  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 4vhf!!1  
 ON_BN_CLICKED(ID_CHANGE, OnChange) L3&Ys3-h  
//}}AFX_MSG_MAP )XI[hVUA  
END_MESSAGE_MAP() *dBy<dIy  
3bEcKA_z(  
BOOL CCaptureDlg::OnInitDialog() d\z6Ob"t  
{ =j7Du[?Vu  
 CDialog::OnInitDialog(); dab]>% M  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); -YoL.`s1   
 ASSERT(IDM_ABOUTBOX < 0xF000); w,{h9f  
 CMenu* pSysMenu = GetSystemMenu(FALSE); XcR=4q|7  
 if (pSysMenu != NULL) ^'UM@dd?!  
 { Xr*I`BJ  
  CString strAboutMenu; 0b&# w  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 'u,|*o  
  if (!strAboutMenu.IsEmpty()) wmVmGa R  
  { Pk?$\  
   pSysMenu->AppendMenu(MF_SEPARATOR);  *7m lH  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); TG2#$Bq1  
  } y:G%p3h)[  
 } m$0W^u  
 SetIcon(m_hIcon, TRUE); // Set big icon 0B6!$) *-i  
 SetIcon(m_hIcon, FALSE); // Set small icon /ViY:-8s  
 m_Key.SetCurSel(0); J,W<ha*  
 RegisterHotkey(); A#U! KX  
 CMenu* pMenu=GetSystemMenu(FALSE); xd Z$|{,  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); l u=a e<M  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); wMa8HeBE\  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); %ms%0%  
 return TRUE; // return TRUE unless you set the focus to a control F)3+IuY  
} lyn%r  
+VwQ=[y]  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) hgU;7R,?ir  
{ U}92%W?  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) hBgE%#`s  
 { g 9,"u_  
  CAboutDlg dlgAbout; +p u[JHF  
  dlgAbout.DoModal(); {3Inj8a=?A  
 } 1U\ap{z@  
 else Q%e<0t7  
 { ?m7:@GOE1  
  CDialog::OnSysCommand(nID, lParam); T(|'.&a  
 } I~,.@{4  
} S^O9}<2g  
YQ0#j'}/  
void CCaptureDlg::OnPaint() %m&6'Rpfk  
{ f*k7 @[rSv  
 if (IsIconic()) v,4{:y]p  
 { +C~h(  
  CPaintDC dc(this); // device context for painting *s6 x  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); zs$r>rlO  
  // Center icon in client rectangle G e;67  
  int cxIcon = GetSystemMetrics(SM_CXICON); }'[>~&/"  
  int cyIcon = GetSystemMetrics(SM_CYICON); 7QO/; zL  
  CRect rect; C'R9Nn'  
  GetClientRect(&rect); N0 {e7M  
  int x = (rect.Width() - cxIcon + 1) / 2; Z\ hcK:  
  int y = (rect.Height() - cyIcon + 1) / 2; =v2 |QuS$  
  // Draw the icon @SfQbM##%  
  dc.DrawIcon(x, y, m_hIcon); IDct!53~  
 } k 9i W1  
 else xGs}hVlZiC  
 { <kB:`&X<\  
  CDialog::OnPaint(); 3W1Lh~Av  
 } fCt|8,-H  
} NcA `E_3  
ljFq;!I5  
HCURSOR CCaptureDlg::OnQueryDragIcon() d/_D|ivZ=  
{ zlMh^+rMX  
 return (HCURSOR) m_hIcon; .n:Q~GEL  
} v9(5H Y  
RZ6y5  
void CCaptureDlg::OnCancel() x*OdMr\n8?  
{ Eq-+g1a  
 if(bTray) <':h/ d  
  DeleteIcon(); }`R,C~-|^  
  CDialog::OnCancel(); uq5?t  
} ]4aPn  
gL<n?FG4b  
void CCaptureDlg::OnAbout() -K|1w'E  
{ Yp\n=#$[  
 CAboutDlg dlg; vF\>;pcT  
 dlg.DoModal(); {4_s:+v0  
} 0%%1:W-  
=O}I{dNKZV  
void CCaptureDlg::OnBrowse() CPB{eQeDuv  
{ f:Pl Mv!{  
 CString str; A f'&, 1=q  
 BROWSEINFO bi; ?%3dgQB'  
 char name[MAX_PATH]; ^ITF*  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); rHKO13WF  
 bi.hwndOwner=GetSafeHwnd(); =lAjQt  
 bi.pszDisplayName=name; L{/% "2>  
 bi.lpszTitle="Select folder"; jNj;#C)  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; etX@z'H  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); l uP;P&  
 if(idl==NULL) /r4l7K  
  return; E#!N8fQ  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); c64^u9  
 str.ReleaseBuffer(); l'I:0a 4T  
 m_Path=str; C0N :z.)4  
 if(str.GetAt(str.GetLength()-1)!='\\') (z sG!v  
  m_Path+="\\"; Jc":zR@5  
 UpdateData(FALSE); k;\gYb%L  
} { Zgd  
96w2qgc2  
void CCaptureDlg::SaveBmp() 7y$\|WG?!r  
{ 9a*#r;R  
 CDC dc; ^kfqw0!  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 5W)ST&YPL*  
 CBitmap bm; Kk^*#vR  
 int Width=GetSystemMetrics(SM_CXSCREEN); 5G355 ,}E  
 int Height=GetSystemMetrics(SM_CYSCREEN); biHacm  
 bm.CreateCompatibleBitmap(&dc,Width,Height); W>#yXg9  
 CDC tdc; gqS9{K(f  
 tdc.CreateCompatibleDC(&dc); 0+SDFh  
 CBitmap*pOld=tdc.SelectObject(&bm); tWn dAM(U7  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); a&>NuMDI  
 tdc.SelectObject(pOld); QIiy\E%  
 BITMAP btm; h0<PQZJ  
 bm.GetBitmap(&btm); ??F* Z" x  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; u1meys a{0  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); VcKB:(:[  
 BITMAPINFOHEADER bih; yzN[%/  
 bih.biBitCount=btm.bmBitsPixel; 4r(0+SO  
 bih.biClrImportant=0; o 2 ng  
 bih.biClrUsed=0; vM/*S 6[  
 bih.biCompression=0; Z3]I^i FI  
 bih.biHeight=btm.bmHeight; 9gg{i6  
 bih.biPlanes=1; m!7%5=Fc  
 bih.biSize=sizeof(BITMAPINFOHEADER); \Kf\%Q  
 bih.biSizeImage=size; )- W1Wtom  
 bih.biWidth=btm.bmWidth; zT>!xGTu7~  
 bih.biXPelsPerMeter=0; 6*i **  
 bih.biYPelsPerMeter=0; G _cJI  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); &_L%wV|[  
 static int filecount=0; +gd5&  
 CString name; t"$~o:U&)  
 name.Format("pict%04d.bmp",filecount++); b`X''6  
 name=m_Path+name; m(8Tup|  
 BITMAPFILEHEADER bfh; <>6j>w_|  
 bfh.bfReserved1=bfh.bfReserved2=0; u1/ >)_U  
 bfh.bfType=((WORD)('M'<< 8)|'B'); b,Wm]N  
 bfh.bfSize=54+size; =zFROB\  
 bfh.bfOffBits=54; AJ7w_'u=@  
 CFile bf; %)j&/QdzF&  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ v@$N,g  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 9JFN8Gf*)  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); nL 5tHz:e  
  bf.WriteHuge(lpData,size); BAQ-1kSz  
  bf.Close(); D [+LU(  
  nCount++; hC2Fup1@  
 } `n$Ak5f  
 GlobalFreePtr(lpData); Z1 Nep !  
 if(nCount==1) u ON(LavB  
  m_Number.Format("%d picture captured.",nCount); r,;ca6>5H  
 else DMUirA;  
  m_Number.Format("%d pictures captured.",nCount); HAn{^8"@  
  UpdateData(FALSE); -+"#G?g  
} B[Lm}B[  
]LB_ @#  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Z8E<^<|  
{ ~kZdep^]  
 if(pMsg -> message == WM_KEYDOWN) F CYGXtc  
 { j4IVIj@$ `  
  if(pMsg -> wParam == VK_ESCAPE) =e6p v#  
   return TRUE; -$8ew+  
  if(pMsg -> wParam == VK_RETURN) =\6)B{#T  
   return TRUE; a/ A c^!(  
 } ko@ej^  
 return CDialog::PreTranslateMessage(pMsg); _r-LX"  
}  w*`:v$  
z_>~=Mm  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |2do8z  
{ tz):$1X_  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ $0[T<]{/?  
  SaveBmp(); 7i($/mNl  
  return FALSE; _*~F1% d  
} G!j9D  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ r~,y3L6ic  
 CMenu pop; /V,xSK9.&  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); `bQ_eRw}  
 CMenu*pMenu=pop.GetSubMenu(0); ?("O.<  
 pMenu->SetDefaultItem(ID_EXITICON); n=!T (Hk  
 CPoint pt; 4K^cj2 X  
 GetCursorPos(&pt); 4o#]hB';ni  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ]ogifnwv  
 if(id==ID_EXITICON) $5pCfW8>  
  DeleteIcon(); ZO/e!yju  
 else if(id==ID_EXIT) r(r(&NU  
  OnCancel(); 7 z    
 return FALSE; 8C{&i5kj\E  
} UPH#~D!  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); .,u>WIUxj  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) OQumA j  
 AddIcon(); eu5te0{G  
 return res; Aits<0  
} ]0D-g2!|A  
VgbNZ{qk@  
void CCaptureDlg::AddIcon() ^t'mW;C$4  
{ eJoM4v  
 NOTIFYICONDATA data; p -$C*0{  
 data.cbSize=sizeof(NOTIFYICONDATA); z)T-<zWO;  
 CString tip; qy|bOl  
 tip.LoadString(IDS_ICONTIP); {\5(aQ)Vi5  
 data.hIcon=GetIcon(0); [ K?  
 data.hWnd=GetSafeHwnd(); ;^/ruf[t  
 strcpy(data.szTip,tip); Rs=Fcvl  
 data.uCallbackMessage=IDM_SHELL; g !^N#o  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ~IZ-:?+S^  
 data.uID=98; I<2`wL=  
 Shell_NotifyIcon(NIM_ADD,&data); ?J2{6,}O*.  
 ShowWindow(SW_HIDE); Xy(QK2|  
 bTray=TRUE; Onx6Fy]L  
} ,g?ny<#o  
c';~bYZ  
void CCaptureDlg::DeleteIcon() Fu.aV876\f  
{ })O S2F  
 NOTIFYICONDATA data; ]\yB,  
 data.cbSize=sizeof(NOTIFYICONDATA); THwM',6  
 data.hWnd=GetSafeHwnd(); CzV;{[?~;  
 data.uID=98; z#+WK| a  
 Shell_NotifyIcon(NIM_DELETE,&data); \hX,z =  
 ShowWindow(SW_SHOW); 9i\}^ s2  
 SetForegroundWindow(); Kyh6QA^  
 ShowWindow(SW_SHOWNORMAL); ]-t )wGr  
 bTray=FALSE; \udB4O  
} ()6% 1zCO  
<lB2Nv-,  
void CCaptureDlg::OnChange() %uo8z~+  
{ j#f/M3  
 RegisterHotkey(); $R}C(k ;?  
} CRo'r/G  
-`4]u!A  
BOOL CCaptureDlg::RegisterHotkey() ZJ{DW4#t  
{ O ?T~>|  
 UpdateData(); Gxd/t#;  
 UCHAR mask=0; d_ =K (}eR  
 UCHAR key=0; '5aA+XP|  
 if(m_bControl) aX.BaK6I  
  mask|=4; KJFQ)#SW!  
 if(m_bAlt) p>)1Z<D"a  
  mask|=2; =+X*$'<J  
 if(m_bShift) ;,-)Z|W  
  mask|=1; |Kd6.Mx  
  key=Key_Table[m_Key.GetCurSel()]; @ fMlbJq  
 if(bRegistered){ dFg&|Lp  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); %# uw8V  
  bRegistered=FALSE; rv[BL.qV  
 } J.rS@Z`~7  
 cMask=mask; rX$-K\4W  
 cKey=key; R}Zaz3( Hd  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ANPG3^w  
 return bRegistered; :G#%+,  
} wp:$Tqa$  
8TYh&n=r  
  四、小结 eQQVfEvS  
8GxT!  
  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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