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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: J[fjl 6p  
  "i$Av m  
  一、实现方法 %h;~@-$  
Bfw]#"N`  
  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: =8`,,=P^  
~fLuys`*:  
#pragma data_seg("shareddata") r 5::c= Cl  
HHOOK hHook =NULL; //钩子句柄 ZgCG'SU  
UINT nHookCount =0; //挂接的程序数目 l%h0x*?$  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 v*}r<} j  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Mfjj+P  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey pQc5'*FKd  
static int KeyCount =0; o@[yF<  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ;j]0GD,c$  
#pragma data_seg() F$Q( 2:w  
F)4Y;;#  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 &mj98  
{<7!=@j  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: r (Ab+1b  
+o)o4l%3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR j["b*X`8G  
cKey,UCHAR cMask) d[ql7  
{ )24r^21.q  
 BOOL bAdded=FALSE; `mV&[`NZ  
 for(int index=0;index<MAX_KEY;index++){ +5(#~  
  if(hCallWnd[index]==0){ B5"(NJ;  
   hCallWnd[index]=hWnd; ^]}UyrOn  
   HotKey[index]=cKey; |<&9_Aq_  
   HotKeyMask[index]=cMask; [>xwwm  
   bAdded=TRUE; 2<Lnfc<^k  
   KeyCount++; 3A2X1V"  
   break; |- 39ZZOX  
  } qX[a\HQa  
 } 4[t1"s~Wg  
 return bAdded; der'<Q.U:k  
} U CzIOxp}  
//删除热键 S0C 7'H%?#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7c|8>zES:E  
{ #N\kMJl$l  
 BOOL bRemoved=FALSE; LU5e!bP  
 for(int index=0;index<MAX_KEY;index++){ !MoJb#B3^]  
  if(hCallWnd[index]==hWnd){ t-gg,ttnA  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &6nOCU)  
    hCallWnd[index]=NULL; zSMN k AM  
    HotKey[index]=0; Ndq|Hkd  
    HotKeyMask[index]=0; 26|2r  
    bRemoved=TRUE; ?qwTOi  
    KeyCount--; cA_77#<8  
    break; mZ sftby}  
   } {Lu-!}\NP  
  } >$h*1/  
 } co<-gy/mCR  
 return bRemoved; 47s<xQy  
} GEU:xn  
.-t#wXEi  
ehQ"<.sQ  
  DLL中的钩子函数如下: / *J}7  
y\&GPr  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) fNOsB^Y  
{ t b5k|  
 BOOL bProcessed=FALSE; kW>Q9Nc=V  
 if(HC_ACTION==nCode) ](yw2c;m e  
 { ~[bS+ ]d!  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 i{zg{$U  
   switch(wParam) BG!;9Z{u  
   {  '3B`4W,  
    case VK_MENU: ~`M>&E@Y_/  
     MaskBits&=~ALTBIT; "X~ayn'@w,  
     break; N|pjGgI  
    case VK_CONTROL: %O-RhB4q  
     MaskBits&=~CTRLBIT; `pS<v.L3  
     break; qa 'YZE`  
    case VK_SHIFT: Srw ciF  
     MaskBits&=~SHIFTBIT; N=hr%{} c  
     break; j&n][=PL  
    default: //judge the key and send message ' O1X+  
     break; #@xSR:m  
   } `k~.>#  
   for(int index=0;index<MAX_KEY;index++){ 2*:lFv wP  
    if(hCallWnd[index]==NULL) 1jU<]09.  
     continue; $!P(Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (as'(+B  
    { ??tyz4$;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); w5,p9f}.  
     bProcessed=TRUE; ]37k\O?vd  
    } 7n W*3(  
   } uJVu:E.#1  
  } #|'&%n|Z  
  else if((lParam&0xc000ffff)==1){ //有键按下 i-oi?x<u&(  
   switch(wParam) KfpDPwP@  
   { OU+oS,  
    case VK_MENU: PGZ.\i  
     MaskBits|=ALTBIT; kb<Nuw  
     break; u=B_cA}:  
    case VK_CONTROL: 9An_zrJ%i  
     MaskBits|=CTRLBIT; Zj;2>  
     break; (3z: ;  
    case VK_SHIFT: 9!sx  
     MaskBits|=SHIFTBIT; jR<yV  
     break; `M?C(  
    default: //judge the key and send message g;)xf?A9q  
     break; - Z?rx5V;t  
   } ldcYw@KQ  
   for(int index=0;index<MAX_KEY;index++){ }}Ah-QU  
    if(hCallWnd[index]==NULL) ='f<_FD  
     continue; ]Hk8XT@Q+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <4s$$Uw}6%  
    { NQefrof  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 3vTX2e.w  
     bProcessed=TRUE; >o #^r;  
    } '@'~_BBZP  
   } \z!*)v/{-  
  } w$Lpuu n{  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 )yp+!\  
   for(int index=0;index<MAX_KEY;index++){ ]|g{{PWH  
    if(hCallWnd[index]==NULL) S^|Uzc  
     continue; .Lz\/ OS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) SrzlR)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); }Y\Ayl  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 a x1  
   } +k]9n*^uz  
  } ^luAX }*  
 } (9q61z A  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); H|>dF)%pj  
} q)R&npP7  
`[\*1GpAo  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: NyU~8?bp  
hPtSY'_@_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); xXQ#?::m  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Q: ?]:i/*  
\M^L'Mkj  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: {`fhcEC  
1GB$;0 W),  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) sxM0c  
{ ]F5?>du@~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ##VS%&{  
 { g+8{{o=  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 +P,hT  
  SaveBmp(); #I[tsly}  
  return FALSE; >*rsRR  
 } `9M:B&  
 …… //其它处理及默认处理 J1DX}h]  
} b*=eMcd  
+ 5E6|  
%.,-dV'  
  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。 J^[>F{8!n  
QUd`({/@:  
  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。 ]5IG00`  
b,kXV<KtU  
  二、编程步骤 $/ ;:Xb=q  
<;\T e4g[  
  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"; FEgM4m.(G<  
WP&P#ju&  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; SPKGbp&  
$ hwJjSZ0  
  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; A `\2]t$z  
nokk! v/  
  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; v>zeK  
LY}%|w  
  5、 添加代码,编译运行程序。 vgRjd1k.\y  
N@J "~9T  
三、程序代码 }.O,P'k  
[eL?O;@BD  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 0eq="|n^|  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 2= FGZa*.  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ fk-zT  
#if _MSC_VER > 1000 mmP>Ji  
#pragma once =N,9#o6^  
#endif // _MSC_VER > 1000 o>x*_4[  
#ifndef __AFXWIN_H__ @czNiWU"4;  
#error include 'stdafx.h' before including this file for PCH Q?Vq/3K;  
#endif +')\,m "z  
#include "resource.h" // main symbols Sz4YP l  
class CHookApp : public CWinApp )70-q yA  
{ `*nVLtT Y  
 public: $ ;cZq  
  CHookApp(); xVHZZ?e  
  // Overrides u 0KVp6`  
  // ClassWizard generated virtual function overrides s.z(1MB]  
  //{{AFX_VIRTUAL(CHookApp) NT?Gl(  
 public: 7 J$  
  virtual BOOL InitInstance();  M\zM-B  
  virtual int ExitInstance(); xaQ]Vjw  
  //}}AFX_VIRTUAL *(~7H6  
  //{{AFX_MSG(CHookApp) 9%aBW7@SK  
  // NOTE - the ClassWizard will add and remove member functions here. AcV 2l  
  // DO NOT EDIT what you see in these blocks of generated code ! 'Ba Ba=  
  //}}AFX_MSG $/</J]2`;  
  DECLARE_MESSAGE_MAP() FbB^$ ]*  
}; 9[}L=n  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); [#$:X+lw  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7Pspx'u  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {HPKp&kl  
BOOL InitHotkey(); Lqy]bnY  
BOOL UnInit(); ?EF[OyE  
#endif M]&F1<  
1,,kU  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. #7/;d=  
#include "stdafx.h" @]yd Wd  
#include "hook.h" Z 4,nl  
#include <windowsx.h> Hq'mv_}qG  
#ifdef _DEBUG (0/g)gW  
#define new DEBUG_NEW %>^CD_[eO  
#undef THIS_FILE 0NlC|5ma)  
static char THIS_FILE[] = __FILE__; LAqmM3{fA  
#endif M3- bFIt  
#define MAX_KEY 100 F|\^O[#R  
#define CTRLBIT 0x04 x*GGO)r  
#define ALTBIT 0x02 yT<6b)&*&  
#define SHIFTBIT 0x01 TZ8:3ti  
#pragma data_seg("shareddata") Y?G9d6]Lk6  
HHOOK hHook =NULL; _E0XUT!rA  
UINT nHookCount =0; S*,DX~vig  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey BUR96YN.  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ?B> { rj  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey )U0`?kD  
static int KeyCount =0; `8^4,  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift tow0/ Jt  
#pragma data_seg() .OI&Zm-  
HINSTANCE hins; 4D(5WJ&  
void VerifyWindow(); !p$z8~  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) \q9wo*A  
//{{AFX_MSG_MAP(CHookApp) Y'tPD#|r  
// NOTE - the ClassWizard will add and remove mapping macros here. i> Wsc?  
// DO NOT EDIT what you see in these blocks of generated code! ?K9&ye_rgw  
//}}AFX_MSG_MAP B:5\+_a!  
END_MESSAGE_MAP() 82ay("ZY  
HD^Ou5YB  
CHookApp::CHookApp() f5p>oXo4b  
{ Pi|WOE2  
 // TODO: add construction code here, ;"/[gFD5u  
 // Place all significant initialization in InitInstance C+ \c(M a  
} K,f*}1$qM  
M*ZR+pq,  
CHookApp theApp; )`;Q]?D   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) c^$_epc*  
{ LLE\;,bv  
 BOOL bProcessed=FALSE; x'dU[f(  
 if(HC_ACTION==nCode) ;!H<W[  
 { R+vago:  
  if((lParam&0xc0000000)==0xc0000000){// Key up D; xRgHn  
   switch(wParam) ~,j52obR6Z  
   { T](N ^P  
    case VK_MENU: >2Z0XEe  
     MaskBits&=~ALTBIT; Mrpz(})  
     break; N<&"_jzm  
    case VK_CONTROL: pW{Q%"W  
     MaskBits&=~CTRLBIT; O  |45r   
     break; ?U+^ctwv7  
    case VK_SHIFT: 3$x[{\ {  
     MaskBits&=~SHIFTBIT; N|t!G^rP  
     break; G i 1Jl"  
    default: //judge the key and send message )S41N^j.  
     break; 7K"{}:  
   } )F_0('=t  
   for(int index=0;index<MAX_KEY;index++){ @ol}~&"  
    if(hCallWnd[index]==NULL) S0-f_,(  
     continue; Sg#$ B#g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) x"/DCcZ  
    { k:1p:&*m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); aMa ICM  
     bProcessed=TRUE; @E Srj[  
    } gumT"x .^  
   } QH~;B[->  
  }  AT@m_d  
  else if((lParam&0xc000ffff)==1){ //Key down 7X+SK&PX  
   switch(wParam) Tp vq5Cz  
   { K&T[F!  
    case VK_MENU: wm1`<r^M.  
     MaskBits|=ALTBIT; *`D}voU  
     break; pxf(C<y6_  
    case VK_CONTROL: (i..7B:  
     MaskBits|=CTRLBIT; ^qB a~  
     break; 9]u=b\fzZ  
    case VK_SHIFT: Kkfza  
     MaskBits|=SHIFTBIT; *u J0ZO9  
     break; o[$~  
    default: //judge the key and send message "AN*2)e4  
     break; o2AfMSt.  
   } ANIx0*Yl(  
   for(int index=0;index<MAX_KEY;index++) D\13fjjHlu  
   { >* Ag0.Az  
    if(hCallWnd[index]==NULL) :V,agAMn  
     continue; tVI6GXH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 244[a] %&;  
    { 4gR;,%E\TO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); !TNp|U!  
     bProcessed=TRUE; &TgS$c5k  
    } q4y P\B  
   } exW|c~|m{A  
  } >:C0ZQUW  
  if(!bProcessed){ $<NrJgQ  
   for(int index=0;index<MAX_KEY;index++){ 2Dc2uU@`r  
    if(hCallWnd[index]==NULL) _?VMSu  
     continue; Z;v5L/;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 'dXGd.V7u  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); K_SURTys  
   } 3@}rO~  
  } }Gvu!a#R  
 } qdW"g$fW  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \v\f'eQ  
} {[I]pm~n  
ey/{Z<D  
BOOL InitHotkey() <cof   
{ $O'IbA  
 if(hHook!=NULL){ ;!~&-I0l  
  nHookCount++; Z]~) ->=}  
  return TRUE; M6nQ17\{  
 } `[)!4Jb  
 else _^%DfMP3i\  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); S4ys)!V1V  
  if(hHook!=NULL) T]_]{%z  
   nHookCount++; "26=@Q^Y  
  return (hHook!=NULL); \&8 61A;  
} yg@8&;bP`  
BOOL UnInit() o=zr]vv  
{ }srmG|@:  
 if(nHookCount>1){ {sOWDM5  
  nHookCount--; E|,RM;7  
  return TRUE; o=]\Jy  
 } MlKSjKl" !  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ^RI& `5g  
 if(unhooked==TRUE){ Svicw`uX0  
  nHookCount=0; -~_[2u^3  
  hHook=NULL; ,K W IuCU;  
 } 7oy}<9  
 return unhooked; Tr@|QNu  
} wU}%]FqtZ=  
&7J-m4BI  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %&iodo,EP'  
{ S+ 3l X7  
 BOOL bAdded=FALSE; Q\W?qB_  
 for(int index=0;index<MAX_KEY;index++){ {*PbD;/f  
  if(hCallWnd[index]==0){ WGwIc7  
   hCallWnd[index]=hWnd; 1IPRI<1U  
   HotKey[index]=cKey; '< .gKo  
   HotKeyMask[index]=cMask; {j8M78}3  
   bAdded=TRUE; [4 v1 N  
   KeyCount++; yM2}J s C  
   break; w}qLI4  
  } cjp~I/U  
 } ,f@\Fs~n  
 return bAdded; xNd p]u  
} Oq9E$0JW  
B&+)s5hh  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dW5@Z-9  
{ ,;@v Vm'}  
 BOOL bRemoved=FALSE; FP<mFqy  
 for(int index=0;index<MAX_KEY;index++){ 1/ 3<u::  
  if(hCallWnd[index]==hWnd){ _C3O^/<n4V  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ jO0"`|(]s  
    hCallWnd[index]=NULL; PcQ\o>0")  
    HotKey[index]=0; fW w+'xF!  
    HotKeyMask[index]=0; l`<1Y|  
    bRemoved=TRUE; k>)Uyw$!  
    KeyCount--; J kxsua  
    break; .<zN/&MXf  
   } O))YJh"'_  
  } eH ]9"^> o  
 }  JfsvK2I  
 return bRemoved; ]iY O}JuX  
} o~{rZ~  
' ~ 1/*F%8  
void VerifyWindow() nv <t$r  
{ A2.GNk  
 for(int i=0;i<MAX_KEY;i++){ ~s{ V!)0  
  if(hCallWnd!=NULL){ {)n@Rq\=v  
   if(!IsWindow(hCallWnd)){ d:Oo5t)MN  
    hCallWnd=NULL; oZ_,WwnE  
    HotKey=0; LzQOzl@z  
    HotKeyMask=0; 5AK@e|G$w  
    KeyCount--; o1Krp '*  
   } z2lT4SAv+  
  } Ea)=K'Pz  
 } 7J ;\&q'  
} |ju+{+  
<U y $b4h  
BOOL CHookApp::InitInstance() M%YxhuT0  
{ eiQ42x@Z  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); IP  
 hins=AfxGetInstanceHandle(); ,MjlA{0  
 InitHotkey(); c'INmc I|  
 return CWinApp::InitInstance(); MCAWn H  
} `>- 56 %  
D<g d)  
int CHookApp::ExitInstance() J=J!)\m  
{ ^ 4Uk'T7V  
 VerifyWindow(); jcp6-XM  
 UnInit(); 25j?0P"&  
 return CWinApp::ExitInstance(); d%K&  
} VXnWY8\  
!CdF,pd/)m  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file NY6;\ 7!n  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) T/PmT:Qg `  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ |'``pq/}_  
#if _MSC_VER > 1000 OFxCV`>ce  
#pragma once j>?`N^  
#endif // _MSC_VER > 1000 PLJDRp 2o  
\S_A e;  
class CCaptureDlg : public CDialog =q(?ALGc  
{ . H}R}^  
 // Construction 1QPz|3f@\  
 public: Ga_Pt8L6  
  BOOL bTray; 8,IQ6Or|-2  
  BOOL bRegistered; ]XASim:A  
  BOOL RegisterHotkey(); qe5;Pq !G  
  UCHAR cKey; _^g4/G#13c  
  UCHAR cMask; IF  cre  
  void DeleteIcon(); xn>N/+,  
  void AddIcon(); M.\XG}RR  
  UINT nCount; Y!`  pF  
  void SaveBmp(); jwg*\HO,s  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 6!HYx  
  // Dialog Data -,+~W#n  
  //{{AFX_DATA(CCaptureDlg) EiDnUL(W7h  
  enum { IDD = IDD_CAPTURE_DIALOG }; Ng2Z7k  
  CComboBox m_Key; XmP,3KG2{S  
  BOOL m_bControl; h1)ny1;  
  BOOL m_bAlt; -zUBK  
  BOOL m_bShift; HV'M31m~q  
  CString m_Path; g~2=he\C  
  CString m_Number; ma xpR>7`j  
  //}}AFX_DATA nIZsKbnw  
  // ClassWizard generated virtual function overrides E[i#8_  
  //{{AFX_VIRTUAL(CCaptureDlg) I/%L,XyRI  
 public: 29l bOi  
  virtual BOOL PreTranslateMessage(MSG* pMsg); RG=i74a  
 protected: voFg6zoV_  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support kxR!hA8wv4  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); v cUGBGX_&  
  //}}AFX_VIRTUAL dOK]Su  
  // Implementation )5`~WzA  
 protected: 4M!wm]n/%5  
  HICON m_hIcon; uz I-1@`  
  // Generated message map functions XgyLlp;,O  
  //{{AFX_MSG(CCaptureDlg) 4:Oq(e_(  
  virtual BOOL OnInitDialog(); OrF.wcg  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); jZQ{ XMF  
  afx_msg void OnPaint(); P 'o]#Az  
  afx_msg HCURSOR OnQueryDragIcon(); ^ p7z3ng  
  virtual void OnCancel(); A9KPU:  
  afx_msg void OnAbout(); Kf6 D)B 26  
  afx_msg void OnBrowse(); )W6l/  
  afx_msg void OnChange(); E`.:V<KW/  
 //}}AFX_MSG K"[\)&WBG  
 DECLARE_MESSAGE_MAP() P @J)S ?  
}; ~xv3R   
#endif K%W;-W*'  
zf]e"e  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file a*t @k*d_  
#include "stdafx.h" r7#.DJnN.  
#include "Capture.h" W56VA>ia  
#include "CaptureDlg.h" >l #D9%  
#include <windowsx.h> ,xR u74  
#pragma comment(lib,"hook.lib") ~Q#! oh'i  
#ifdef _DEBUG E,dUO;  
#define new DEBUG_NEW lWH#/5`h  
#undef THIS_FILE Bt#'6::  
static char THIS_FILE[] = __FILE__; ]t~'wL#Z  
#endif Mnk-"d  
#define IDM_SHELL WM_USER+1 #|3,DZ|)F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f~,Ml*Zp  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l8J2Xd @   
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ei>iXDt  
class CAboutDlg : public CDialog zC*dJXt@  
{ tqCwbi  
 public: h4=mGJpm  
  CAboutDlg(); 4c qf=  
  // Dialog Data S&.xgBR  
  //{{AFX_DATA(CAboutDlg) mfF `K2R  
  enum { IDD = IDD_ABOUTBOX }; Z4:^#98c.  
  //}}AFX_DATA 7=NKbv]  
  // ClassWizard generated virtual function overrides )#GF:.B  
  //{{AFX_VIRTUAL(CAboutDlg) x3( ->?)D  
 protected: <$pv;]n  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support cL!A,+S[_  
  //}}AFX_VIRTUAL u\M xQIo'u  
  // Implementation '@ p464  
 protected: :xTm- L  
  //{{AFX_MSG(CAboutDlg) (74y2U6  
  //}}AFX_MSG V2xvuDHI  
  DECLARE_MESSAGE_MAP() BPl% SL  
}; "LH!Trl@k  
e2BC2K0  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) f`*VNB`  
{ WgG$ r  
 //{{AFX_DATA_INIT(CAboutDlg) )#1!%aQ  
 //}}AFX_DATA_INIT 2#00<t\  
} 4"3.7.<Q`  
}D?qj3?bj  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) SSbx[<E3  
{ ^7*7^<  
 CDialog::DoDataExchange(pDX); MslgQmlM  
 //{{AFX_DATA_MAP(CAboutDlg) Q, "8Ty  
 //}}AFX_DATA_MAP pr1bsrMuL  
} )pe17T1|  
$pKegK;'z  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) xX9snSGz  
 //{{AFX_MSG_MAP(CAboutDlg) dz>Jl},`k  
 // No message handlers X 5X D1[  
 //}}AFX_MSG_MAP H:9G/Nev  
END_MESSAGE_MAP() S{v]B_N[M  
#0Uz1[  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) o2hk!#5[4  
: CDialog(CCaptureDlg::IDD, pParent) [clwmx  
{ A|]#b?-  
 //{{AFX_DATA_INIT(CCaptureDlg) 'x<oILOG  
  m_bControl = FALSE; 2`%a[t@M.  
  m_bAlt = FALSE; hSXJDT2  
  m_bShift = FALSE; K3UN#G)U  
  m_Path = _T("c:\\"); C@\5%~tW+  
  m_Number = _T("0 picture captured."); @$t\yBSK  
  nCount=0; GKOl{och  
  bRegistered=FALSE; &r*F+gL  
  bTray=FALSE; ()w;~$J  
 //}}AFX_DATA_INIT `S5::U6E  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 {]Cn@.TPD  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); $.:x3TsA  
} fL d2{jI,  
Rjlp<  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) GD'Z"rhI  
{ *9w-eK1{  
 CDialog::DoDataExchange(pDX); r{84Y!k~*  
 //{{AFX_DATA_MAP(CCaptureDlg) q_ryW$/_  
  DDX_Control(pDX, IDC_KEY, m_Key); $cc]Av4c2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); U 8p %MFD  
  DDX_Check(pDX, IDC_ALT, m_bAlt); =yM%#{t&W  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 80 T2EN:$  
  DDX_Text(pDX, IDC_PATH, m_Path); lUA-ug! ^  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Bd)Cijr  
 //}}AFX_DATA_MAP [}GK rI  
} B"\9slX  
nHH FHnFf  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) A L^tUcl  
//{{AFX_MSG_MAP(CCaptureDlg) ggitUQ+t;G  
 ON_WM_SYSCOMMAND() H~mp*S  
 ON_WM_PAINT() 2"6qg>]-t  
 ON_WM_QUERYDRAGICON() FC6~V6R  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) NI.ROk1{+4  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ,!GoFu  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 2K o]Q_,~  
//}}AFX_MSG_MAP r>i95u82'  
END_MESSAGE_MAP() 4zt:3bW U  
9Li&0E  
BOOL CCaptureDlg::OnInitDialog() ;+|Z5+7!6  
{ GA/afc,V  
 CDialog::OnInitDialog(); MxT&@pq  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); oyY z3X  
 ASSERT(IDM_ABOUTBOX < 0xF000); VCiq'LOR,<  
 CMenu* pSysMenu = GetSystemMenu(FALSE); @D=%J!!*  
 if (pSysMenu != NULL) <1Sj_HCT  
 { /988K-5k  
  CString strAboutMenu; '6e4rn{  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Ycq )$7p  
  if (!strAboutMenu.IsEmpty()) 98O]tL+k/u  
  { GCiG50Z=  
   pSysMenu->AppendMenu(MF_SEPARATOR); u*W! !(P/  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ' (XB|5  
  } *]h"J]  
 } 2<p@G#(  
 SetIcon(m_hIcon, TRUE); // Set big icon k9<UDg_ Y  
 SetIcon(m_hIcon, FALSE); // Set small icon E i>GhvRM  
 m_Key.SetCurSel(0); WiB~sIp  
 RegisterHotkey(); d!}oS<6  
 CMenu* pMenu=GetSystemMenu(FALSE); XEagN:  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); x- ue1  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); jpS$5Ct  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ]];pWlo!  
 return TRUE; // return TRUE unless you set the focus to a control {:VK}w  
} ~m,~;  
,Wu$@jD/ ]  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ceD6q~)  
{ 'W4v>0   
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) }YBuS3{  
 { -sZ'<(3  
  CAboutDlg dlgAbout; XqUQ{^;aI  
  dlgAbout.DoModal(); XksI.]tfj  
 } v_pe=LC{-e  
 else n}e%c B  
 { Im!b-1  
  CDialog::OnSysCommand(nID, lParam); @>.aQE  
 } !L q'o ?  
} 0vX6n6G}  
-u<F>C  
void CCaptureDlg::OnPaint() r79 P|)\  
{ S9 $t9o  
 if (IsIconic()) `GY3H3B  
 { 5}Ge  
  CPaintDC dc(this); // device context for painting ^ <`SUBI  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); vV$^`WY4  
  // Center icon in client rectangle TOKt{`2}  
  int cxIcon = GetSystemMetrics(SM_CXICON); $'_Q@ZBq  
  int cyIcon = GetSystemMetrics(SM_CYICON); xgj'um  
  CRect rect; T+zhj++  
  GetClientRect(&rect); TbT/ 5W3  
  int x = (rect.Width() - cxIcon + 1) / 2; 5mpql[v3P  
  int y = (rect.Height() - cyIcon + 1) / 2; -3~S{)  
  // Draw the icon He5y;5  
  dc.DrawIcon(x, y, m_hIcon); L kl E,W  
 } ]v),[]Xs  
 else +/eJ#Xw3u8  
 { Y3FFi M[s~  
  CDialog::OnPaint(); T}1"  
 } 3`vKEThY)  
} K@%T5M4j  
e!L5 v?  
HCURSOR CCaptureDlg::OnQueryDragIcon() #3LZX!  
{ +l/kH9m  
 return (HCURSOR) m_hIcon; LVm']_K(f  
} RMpiwO^  
("j;VqYUL  
void CCaptureDlg::OnCancel() ":qHDL3  
{ N~IAm:G}[  
 if(bTray) 9+@z:j  
  DeleteIcon(); 0V]MAuD($  
  CDialog::OnCancel(); NB'G{),)Z  
} 1y6<gptx  
htL1aQ.  
void CCaptureDlg::OnAbout() )4s7,R  
{ !v=/f_6  
 CAboutDlg dlg; ohyq/u+y~A  
 dlg.DoModal(); _Li.}g@Bd  
} He4HI Z  
0-{E% k  
void CCaptureDlg::OnBrowse() +zk5du^gZ  
{ V#.pi zb  
 CString str; MZf?48"f  
 BROWSEINFO bi; 4gev^/^^  
 char name[MAX_PATH]; ^[}W}j>  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); .>[l@x"  
 bi.hwndOwner=GetSafeHwnd(); "M/) LXn:0  
 bi.pszDisplayName=name; Q(aNa!  
 bi.lpszTitle="Select folder"; /F"eqMN  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; I0Allw[  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); fJ5mKN  
 if(idl==NULL) .57F h)Y  
  return; "q=ss:(  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?SO!INJ  
 str.ReleaseBuffer(); zh=0zJ  
 m_Path=str; @6+_0^  
 if(str.GetAt(str.GetLength()-1)!='\\') dqQJC qc!  
  m_Path+="\\"; Yy]TU} PY  
 UpdateData(FALSE); yi~]}M  
} A& B|n!;b  
3X;>cv#B  
void CCaptureDlg::SaveBmp() _%Xp2`m  
{ -zJ V(`  
 CDC dc; {{_v.d~1  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); cfv: Ld m  
 CBitmap bm; ~8(Xn2  
 int Width=GetSystemMetrics(SM_CXSCREEN); ;8K> ]T)  
 int Height=GetSystemMetrics(SM_CYSCREEN); ?f3R+4  
 bm.CreateCompatibleBitmap(&dc,Width,Height); B=%%3V)2  
 CDC tdc; C{nk,j L  
 tdc.CreateCompatibleDC(&dc); Akc |E!V  
 CBitmap*pOld=tdc.SelectObject(&bm); LH+Bu%s  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); RyukQY~<W  
 tdc.SelectObject(pOld); 3]lq#p:  
 BITMAP btm; RdyKd_0`Q  
 bm.GetBitmap(&btm); 0F_hXy@K  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; sKKc_H3YSH  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); fH_l2b[-3@  
 BITMAPINFOHEADER bih; ;r6YIS4@  
 bih.biBitCount=btm.bmBitsPixel; ;~$Q;m 1  
 bih.biClrImportant=0; "x$L 2>9  
 bih.biClrUsed=0; M[O22wFs  
 bih.biCompression=0; fJ _MuAv  
 bih.biHeight=btm.bmHeight; R<Mp$K^b  
 bih.biPlanes=1; {: _*P TVk  
 bih.biSize=sizeof(BITMAPINFOHEADER); =?+w5oI0  
 bih.biSizeImage=size; T95FoA  
 bih.biWidth=btm.bmWidth; _7';1 D  
 bih.biXPelsPerMeter=0; !ii( 2U  
 bih.biYPelsPerMeter=0; \}kR'l  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); n{~&^Nby*I  
 static int filecount=0; {jR3D!hK  
 CString name; j r .{M  
 name.Format("pict%04d.bmp",filecount++); d_&pxy? >  
 name=m_Path+name; o+ {i26%  
 BITMAPFILEHEADER bfh; '~f*O0_  
 bfh.bfReserved1=bfh.bfReserved2=0; Ei+lVLoC  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ht6}v<x.eA  
 bfh.bfSize=54+size; 6(htpT%J  
 bfh.bfOffBits=54; CKe72OC  
 CFile bf; HN/YuP03[  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ NYg&8s.  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); m8F \ESL  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); e]; IQ|  
  bf.WriteHuge(lpData,size); |E$q S)y  
  bf.Close(); 33eOM(`D[  
  nCount++; *sB'D+-/  
 } +lFBH(o]X  
 GlobalFreePtr(lpData); cp~6\F;c  
 if(nCount==1) HA}q.L]#  
  m_Number.Format("%d picture captured.",nCount); ` -SC,qHw  
 else DoO ;VF  
  m_Number.Format("%d pictures captured.",nCount); x5smJ__/  
  UpdateData(FALSE); lB/ ^  
} ;*FY+jM  
+8 \?7,FY  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) EW4a@  
{ IUh9skW5  
 if(pMsg -> message == WM_KEYDOWN) ^2%)Nq;O  
 { 9{S$%D  
  if(pMsg -> wParam == VK_ESCAPE) }uaFmXy3  
   return TRUE; e?07o!7[;  
  if(pMsg -> wParam == VK_RETURN) y0O e)oP  
   return TRUE; %G6x\[,  
 } l& sEdEA  
 return CDialog::PreTranslateMessage(pMsg); %z[=T@  
} 1B&XM^>/  
sRcS-Yw[S  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Mg8ciV}\xY  
{ 5S&Qj7kr  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ L&WhX3$u  
  SaveBmp(); _RHB ^y;-  
  return FALSE;  gh{Z=_  
} */ ~_3  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ vCB0 x:/  
 CMenu pop; Y%B:IeF}  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); W".: 1ov#B  
 CMenu*pMenu=pop.GetSubMenu(0); dP0%<Q|  
 pMenu->SetDefaultItem(ID_EXITICON); MY[QYBkn}  
 CPoint pt; ,'E+f%  
 GetCursorPos(&pt); #H;yXsR `  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); y]5c!N %8  
 if(id==ID_EXITICON) j6NK 7Li  
  DeleteIcon(); t3dvHU&Z:  
 else if(id==ID_EXIT) tN&X1  
  OnCancel(); oY7 eVuz  
 return FALSE; +'9eo%3O  
} 6g'+1%O  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); xBAASy  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) e",0Er FT  
 AddIcon(); x$24Nc1a'  
 return res; vkW]?::Cfd  
} VY "i>Ae  
79>_aD9  
void CCaptureDlg::AddIcon() CM+/.y T  
{ W.  p'T}2  
 NOTIFYICONDATA data; L_}F.nbS5  
 data.cbSize=sizeof(NOTIFYICONDATA); 7)y +QU]  
 CString tip; .0]Odf:@  
 tip.LoadString(IDS_ICONTIP); 1)ZdkTF@H  
 data.hIcon=GetIcon(0); jLreN#:9  
 data.hWnd=GetSafeHwnd(); PA>su)N$  
 strcpy(data.szTip,tip); 1'9YY")#  
 data.uCallbackMessage=IDM_SHELL; 4z!(!J )  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; q@Sj$  
 data.uID=98; yx/.4DW1Ua  
 Shell_NotifyIcon(NIM_ADD,&data); 2R`}}4<Z  
 ShowWindow(SW_HIDE); s%t =*+L\  
 bTray=TRUE; *gN)a%9  
} t`vIcCXqyl  
\m1jV>q  
void CCaptureDlg::DeleteIcon() ??=7pFm  
{ oOHr~<  
 NOTIFYICONDATA data; IsP!ZcV;  
 data.cbSize=sizeof(NOTIFYICONDATA); ph=U<D4  
 data.hWnd=GetSafeHwnd(); bd3q207>  
 data.uID=98; S&;D  
 Shell_NotifyIcon(NIM_DELETE,&data); |=ljN7]!  
 ShowWindow(SW_SHOW); nWv6I&  
 SetForegroundWindow(); M7SVD[7~HM  
 ShowWindow(SW_SHOWNORMAL); VseeU;q  
 bTray=FALSE; s@5r}6?M  
} IP l]$j>N  
VHTr;(]hk  
void CCaptureDlg::OnChange() +v"%@lC};  
{ q<w Q/m  
 RegisterHotkey(); 1<3!   
} = j S  
!gFUC<4bu  
BOOL CCaptureDlg::RegisterHotkey() kIYV%O   
{ &p:GB_  
 UpdateData(); N!^5<2z@eT  
 UCHAR mask=0; kS$m$ D  
 UCHAR key=0; a1# 'uS9W  
 if(m_bControl) "3:TrM$|A  
  mask|=4; [;hCwj#  
 if(m_bAlt) W1p5F\ wt  
  mask|=2; j-wz7B  
 if(m_bShift) g'1ASMuR  
  mask|=1; \9s x_T  
  key=Key_Table[m_Key.GetCurSel()]; -87]$ ax  
 if(bRegistered){ rgXD>yu(  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); K^+}__;]  
  bRegistered=FALSE; q. NvwJ  
 } ,N`D{H"F  
 cMask=mask; M[,G#GO  
 cKey=key; \P7y&`|  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); vP{;'R  
 return bRegistered; P0XVR_TJf  
} b#E!wMClS  
+K03yphZr  
  四、小结 `d. 4 L.],  
:_"%o=  
  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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