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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: 9"I/jd0B  
  R1&(VK{  
  一、实现方法 #J\ 2/~  
T&tCXi  
  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: M})2y+  
V\r5  
#pragma data_seg("shareddata") *jCXH<?R  
HHOOK hHook =NULL; //钩子句柄 !FA^~  
UINT nHookCount =0; //挂接的程序数目 5A>W;Q\4  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 V`l.F"<L  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 *h-_   
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey u;F++$=  
static int KeyCount =0; 1Ty{k^%  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 A@?2qX^4  
#pragma data_seg() ,}=x8Xxr  
ALiA+k N  
  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。 8]YFlW9  
"6gu6f  
  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: 38>8{Ma  
CD +,&id  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR V2^(qpM!  
cKey,UCHAR cMask) pV=X  
{ s~6?p% 2]  
 BOOL bAdded=FALSE; BikmAa  
 for(int index=0;index<MAX_KEY;index++){ ${8 1~  
  if(hCallWnd[index]==0){ W&A22jO.1  
   hCallWnd[index]=hWnd; ullq}}  
   HotKey[index]=cKey; lo,?mj%M  
   HotKeyMask[index]=cMask; MV-fDqA(  
   bAdded=TRUE; w3:Y]F.ot  
   KeyCount++; HfFP4#C,  
   break; Gm}ecW  
  } j I_TN5  
 } $"!"=v%B  
 return bAdded; g|9' Lk  
} pa~.[cBI  
//删除热键 )|x) KY  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) NJ/6_e  
{ <*i '  
 BOOL bRemoved=FALSE; #VgPg5k.<  
 for(int index=0;index<MAX_KEY;index++){ Ep|W>  
  if(hCallWnd[index]==hWnd){ g7EJyA  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _bHmcK  
    hCallWnd[index]=NULL; 5)wz`OS  
    HotKey[index]=0; Q0Y0Zt,h  
    HotKeyMask[index]=0; u%Bk"noCa  
    bRemoved=TRUE; 0V uG(O  
    KeyCount--; nr Jl>H  
    break; <Qe30_<K  
   } <T>C}DGw  
  } f\nF2rlu  
 } GPy+\P`  
 return bRemoved; ZxlQyr`~a(  
} *[]7l]XK.  
_8vq]|rC  
EJ`JN|,M  
  DLL中的钩子函数如下: L~%@pf>  
6Z]* ce<r  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;?"]S/16,  
{ T\eOrWt/  
 BOOL bProcessed=FALSE; P3jDx{F  
 if(HC_ACTION==nCode) X-|Lg.s  
 { 6J9^:gXW~  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 y m<3  
   switch(wParam) )@Fuw*  
   {  1@JAY!yoo_  
    case VK_MENU: 3K c  
     MaskBits&=~ALTBIT; l~kxt2&  
     break; ijOUv6=-  
    case VK_CONTROL: R*3x{DNL  
     MaskBits&=~CTRLBIT; 2 1.;lj  
     break; Xp"ZK=r  
    case VK_SHIFT: :@a8>i1&  
     MaskBits&=~SHIFTBIT; 4:GVZR|-  
     break; BUqe~E|I  
    default: //judge the key and send message S 'S|k7Lp  
     break; (%=[J/F/  
   } I?}YS-2  
   for(int index=0;index<MAX_KEY;index++){ <)ozbv Xk  
    if(hCallWnd[index]==NULL) DUUQz:?{J  
     continue; *Hx{eqC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )F Q '^  
    { |dcRDOTe  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); |B yw]\3v  
     bProcessed=TRUE; atR WKsY<  
    } FvQ>Y')R7Z  
   } =:OS"qD3l  
  } %g1:yx  
  else if((lParam&0xc000ffff)==1){ //有键按下 'o;>6u<u  
   switch(wParam) ^}vLZA  
   { W9nmTz\8  
    case VK_MENU: MA1.I4dm  
     MaskBits|=ALTBIT; <\l@`x96"D  
     break; {WfZE&B  
    case VK_CONTROL: T<1* R>el  
     MaskBits|=CTRLBIT; mxUM&`[  
     break; / qp)n">  
    case VK_SHIFT: w-9M{Es+j  
     MaskBits|=SHIFTBIT; ;LSdY}*%0  
     break; -8H0f- 1  
    default: //judge the key and send message ]w ^9qS  
     break; I*8i=O@0T  
   } WfYu-TK *  
   for(int index=0;index<MAX_KEY;index++){ S?TyC";!  
    if(hCallWnd[index]==NULL) r/E'#5 Q  
     continue; F*Lm=^:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Kgh@.Ir  
    { B=?4; l7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); >(nb8T|  
     bProcessed=TRUE; JtA tG%  
    } CJ0{>?  
   } O%feBe  
  } 67<Ym0+ =  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 rBR,lS$4  
   for(int index=0;index<MAX_KEY;index++){ >HMuh)  
    if(hCallWnd[index]==NULL) QfqosoP\D  
     continue; hI249gW9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7S+_eL^  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); B+W 4r9#  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 "W!Uxc  
   } DLMM1 A  
  }  5`];[M9  
 } ^=kUNyY  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (<y~]igy  
} cbsU!8  
=^  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: s az<NT  
]!l]^/ .  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *2wFLh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %-u Ra\  
<*O~?=6p  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: !@2L g  
v(PwE B]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ="X2AuK%1$  
{ ca~nfo  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) w'uI~t4  
 { c*iZ6j"iI  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 !=sM `(=~  
  SaveBmp(); g~,"C8-H  
  return FALSE; 9UF^h{X  
 } R`%C]uG  
 …… //其它处理及默认处理 aB@D-Y"HO  
} oUXi 4lsSc  
~cHpA;x9<^  
ZcT%H*Ib]9  
  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。 7Q_AZR 4  
vd0;33$L  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 %OS}BAh^i  
h?UUd\RU)  
  二、编程步骤 frsqnvm;+  
Pr|:nJs  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Rn] `_[)*~  
UvR F\x%  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; POZ5W)F(  
Rwu y!F  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; uU+R,P0  
f9R~RRz  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; lt:xN?--A?  
4.>rd6BAN-  
  5、 添加代码,编译运行程序。 ="yN4+0-p  
Ab| t E5%  
三、程序代码 RXo!K iQO  
<m") 2dJ  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 2>bTcud>  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)  _tl  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Nd5G-eYI  
#if _MSC_VER > 1000 ):LgZ4h  
#pragma once W Z!?O0.A  
#endif // _MSC_VER > 1000 >gQJ6q  
#ifndef __AFXWIN_H__ nu'r `  
#error include 'stdafx.h' before including this file for PCH ar+ j`QIe  
#endif 16;r+.FB'  
#include "resource.h" // main symbols qM~;Q6{v  
class CHookApp : public CWinApp U/9i'D[|{  
{ +0{$J\s  
 public: uv&??F]/  
  CHookApp(); 701mf1a  
  // Overrides ,RP"m#l!\  
  // ClassWizard generated virtual function overrides UG@9X/l}  
  //{{AFX_VIRTUAL(CHookApp) gL)l)}#  
 public:  j<BW/  
  virtual BOOL InitInstance(); >h!>Ll  
  virtual int ExitInstance(); 1R}rL#h;=  
  //}}AFX_VIRTUAL ?W6qwm,?L  
  //{{AFX_MSG(CHookApp) O %x<  
  // NOTE - the ClassWizard will add and remove member functions here. U,;a+z4\  
  // DO NOT EDIT what you see in these blocks of generated code ! :TPT]q d@  
  //}}AFX_MSG *9XKkR<r  
  DECLARE_MESSAGE_MAP() 3e)W_P*0?  
}; RB,`I#z1f  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); %3Ba9Nmid  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #8cpZ]#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); D'F j"&LK  
BOOL InitHotkey(); R]LRgfi9  
BOOL UnInit(); /b|V=j}W  
#endif <./r%3$;7  
]U4)2s  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. C[4{\3\Va  
#include "stdafx.h" a/@F?\A  
#include "hook.h" 4@qHS0$  
#include <windowsx.h> _S$ SL%;\  
#ifdef _DEBUG E4C yW  
#define new DEBUG_NEW FV 0x/)<z  
#undef THIS_FILE <6!;mb ;cX  
static char THIS_FILE[] = __FILE__; IasWm/  
#endif >+/2g  
#define MAX_KEY 100 g-4m.;  
#define CTRLBIT 0x04 5.IX  
#define ALTBIT 0x02 [|5gw3 y  
#define SHIFTBIT 0x01 k}0Y&cT!rU  
#pragma data_seg("shareddata") UPE9e   
HHOOK hHook =NULL; =x &"aF1  
UINT nHookCount =0; iNlY\67sW  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey P( Gv|Q@  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT cZb5h 9  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey *wfb~&: }  
static int KeyCount =0; @P'("qb~  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ;2&ym)`  
#pragma data_seg() 8@)4)+e  
HINSTANCE hins;  cFV)zFu  
void VerifyWindow(); 'joc8o sS  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) G`D~OI  
//{{AFX_MSG_MAP(CHookApp) Ic<J]+Xq  
// NOTE - the ClassWizard will add and remove mapping macros here. ~zd+M/8  
// DO NOT EDIT what you see in these blocks of generated code! G/)]aGr  
//}}AFX_MSG_MAP e`7dRnx&0  
END_MESSAGE_MAP() C"gH>G  
f"Z2,!Z;  
CHookApp::CHookApp() ,UveH` n-  
{ SjmWlf,  
 // TODO: add construction code here, :TZ</3Sw  
 // Place all significant initialization in InitInstance C/JFb zVx  
} U65a _dakk  
-W\1n#J  
CHookApp theApp; vl"{ovoC  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) x%`.L6rj  
{ 4nz$J a)  
 BOOL bProcessed=FALSE; N E/_  
 if(HC_ACTION==nCode) 4b@ Awtk  
 { Y CBcyE}p  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8q"C=t7  
   switch(wParam) 5*#3v:l/9  
   { j@guB:0  
    case VK_MENU: G@(ukt`0}  
     MaskBits&=~ALTBIT;  L7rEMq  
     break; .1q4Q\B<  
    case VK_CONTROL: M3EB=tU  
     MaskBits&=~CTRLBIT; .wPu #*  
     break; QcN$TxU>  
    case VK_SHIFT: jTh^#Q  
     MaskBits&=~SHIFTBIT; T1_qAz+  
     break; >39\u &)  
    default: //judge the key and send message b]oPx8*'  
     break; xE"QX N  
   } +8zC ol?j  
   for(int index=0;index<MAX_KEY;index++){ ?AlTQL~c  
    if(hCallWnd[index]==NULL) < cUaIb;(4  
     continue; |9;MP&68  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) x3C^S~  
    { fnJ!~b*qo  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); \)/dFo\l  
     bProcessed=TRUE; :dML+R#Ymh  
    } ][[\!og  
   } IV]2#;OO?  
  }  x#hGJT  
  else if((lParam&0xc000ffff)==1){ //Key down An2Wj  
   switch(wParam) wQR0R~|M  
   { ^;DbIo\6H  
    case VK_MENU: _c@k>"_{S  
     MaskBits|=ALTBIT; \1H~u,a  
     break; AZ'"Ua  
    case VK_CONTROL: nu!tk$Q  
     MaskBits|=CTRLBIT; qCUn. mI  
     break; vq_v;$9}  
    case VK_SHIFT: mcm8|@Y{  
     MaskBits|=SHIFTBIT; [Fo" MeH?R  
     break; zjlo3=FQX[  
    default: //judge the key and send message =.9uuF:  
     break; ><r\ 5`  
   } -A3>+G3[  
   for(int index=0;index<MAX_KEY;index++) NkYU3[m$v  
   { snccDuS  
    if(hCallWnd[index]==NULL) |h{#r7H0  
     continue; !3J YG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A DW>  
    { lRr={ >s  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); G&f~A;'7k  
     bProcessed=TRUE; U%zZw)  
    } `a:L%Ex  
   } hn p-x3  
  }  `xm4?6  
  if(!bProcessed){ )gb gsQZ  
   for(int index=0;index<MAX_KEY;index++){ |-! yKB  
    if(hCallWnd[index]==NULL) A3cW8 OClz  
     continue; tiHP? N U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [pgld9To  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); lMW4SRk1C  
   } %yJ $R2%*y  
  } <-%OXEG  
 } qTd6UKg  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 0s+pcqOd^  
} w=K!U]  
CDRkH)~$  
BOOL InitHotkey() cN] ]J  
{ SPEDN}/^  
 if(hHook!=NULL){ [bIR$c[G  
  nHookCount++; :4'Fq;%C  
  return TRUE; )?qH#>mD6  
 } o;\c$|TNU  
 else IP e"9xb  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); [tEHr  
  if(hHook!=NULL) .dStV6  
   nHookCount++; $hGiI  
  return (hHook!=NULL); @*{sj`AS '  
} zbM*/:Y  
BOOL UnInit() 2B<0|EGtzw  
{ Y#[>j4<T  
 if(nHookCount>1){ .)Af&+KT  
  nHookCount--; Z.v2 !u  
  return TRUE; QTKN6P  
 } eo~>|0A*V  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 0*-nVC1  
 if(unhooked==TRUE){ 7Rix=*  
  nHookCount=0; 1E'/!|  
  hHook=NULL; n;+e(ob;;  
 } sH}q&=  
 return unhooked; Il&}4#:  
} 3$hbb6N%6.  
Pu-/*Fx  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <F7g;s'q9  
{ -jJw wOm  
 BOOL bAdded=FALSE; y!;PBsU%Sx  
 for(int index=0;index<MAX_KEY;index++){ fvUD'sx  
  if(hCallWnd[index]==0){ |loo ^!I  
   hCallWnd[index]=hWnd; pHpHvSI  
   HotKey[index]=cKey; }[%d=NY  
   HotKeyMask[index]=cMask; n$S`NNO{]  
   bAdded=TRUE; Bt\z0*t=s  
   KeyCount++; zLa3Q\T  
   break; Y3J;Kk#AH  
  } 5?()o}VjAO  
 } NX5A{  
 return bAdded; ^Nu0+S  
} 1; "t8.*%e  
zJJ6"9sl  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) M zbs#v0  
{ |0jmOcZF  
 BOOL bRemoved=FALSE; w_sA8B  
 for(int index=0;index<MAX_KEY;index++){ 6uAo0+-k  
  if(hCallWnd[index]==hWnd){ OSsxO(;g  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ nfV32D|3  
    hCallWnd[index]=NULL; l`}Ag8Q  
    HotKey[index]=0; d*A(L5;@  
    HotKeyMask[index]=0; =b* Is,R/  
    bRemoved=TRUE; 't5 I%F  
    KeyCount--; U =G^w L  
    break; .PhH|jrCW^  
   } Qf}^x9'  
  } S _B $-H|  
 } g[,1$39Z|@  
 return bRemoved; H%*< t}  
} {MaFv  
j$K[QSn  
void VerifyWindow() TBzOz:k  
{ h6Vm;{ ~  
 for(int i=0;i<MAX_KEY;i++){ 5*d  
  if(hCallWnd!=NULL){ v GT#BS%  
   if(!IsWindow(hCallWnd)){ UW%.G  
    hCallWnd=NULL; :Gdfpz-{?  
    HotKey=0; b(Ev:  
    HotKeyMask=0; 2+Tu"oG;rB  
    KeyCount--; _IK@K 6V1  
   } 0K&\5xXM  
  } 8jnz;;|  
 } >+ZD 6l/  
} ~alC5|wCUQ  
2eOde(K+  
BOOL CHookApp::InitInstance() z>f>B6  
{ l]s,CX  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); @?w8XHEa|  
 hins=AfxGetInstanceHandle(); O-M4NKl]6  
 InitHotkey(); Z L3aO,G2  
 return CWinApp::InitInstance(); osJ;"B36  
} =H F||p@  
CS:mO |  
int CHookApp::ExitInstance() Use`E  
{ @Ik@1  
 VerifyWindow(); |Ki\Q3O1  
 UnInit(); k]n=7vw;  
 return CWinApp::ExitInstance(); {ER%r'(4Z  
} r`Qzn" H  
-'tgr6=|w"  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file l+>&-lX'  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) NY5?T0/[  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ?5%|YsJP_  
#if _MSC_VER > 1000 ?\QEK  
#pragma once !~{AF|2f  
#endif // _MSC_VER > 1000 2[\I{<2/9  
*N0R3da  
class CCaptureDlg : public CDialog P8JN m"C  
{ Lmy ^/P%  
 // Construction dnby&-+T  
 public: {5f? y\Z  
  BOOL bTray; 7kBULeBn|  
  BOOL bRegistered; 0YsC@r47wL  
  BOOL RegisterHotkey(); G?Y2 b  
  UCHAR cKey; 0;Y|Ua[G+~  
  UCHAR cMask; m,e @bJ-  
  void DeleteIcon(); MSm vQ  
  void AddIcon(); %5=XszS  
  UINT nCount; qp-/S^%  
  void SaveBmp(); (9N75uCa  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor rurC! -  
  // Dialog Data e ,_b  
  //{{AFX_DATA(CCaptureDlg) EHT5Gf  
  enum { IDD = IDD_CAPTURE_DIALOG }; W*q[f!@  
  CComboBox m_Key; zS*X9|p  
  BOOL m_bControl; \ORNOX:  
  BOOL m_bAlt; =TDK$Ek  
  BOOL m_bShift; lO-:[@  
  CString m_Path; #'Q_eBX  
  CString m_Number; `}s$cgEG  
  //}}AFX_DATA &#'[]V%^F  
  // ClassWizard generated virtual function overrides  0u4:=Z}W  
  //{{AFX_VIRTUAL(CCaptureDlg) E%M~:JuKd?  
 public: I$4GM  
  virtual BOOL PreTranslateMessage(MSG* pMsg); &Bbs\ ;  
 protected: -WIT0F4o;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ellj/u61bj  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); nn@"68]g  
  //}}AFX_VIRTUAL %@Nuzdp  
  // Implementation `J h> 1l  
 protected: klG]PUzd  
  HICON m_hIcon; }bG|(Wp9  
  // Generated message map functions @Z.s:FV[  
  //{{AFX_MSG(CCaptureDlg) %C%~f {4  
  virtual BOOL OnInitDialog(); iHo2=Cz  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 7E$ e1=  
  afx_msg void OnPaint(); OLc/Vij;  
  afx_msg HCURSOR OnQueryDragIcon(); r"OVu~ND  
  virtual void OnCancel(); '&5A*X]d  
  afx_msg void OnAbout(); [-cYFdt"V  
  afx_msg void OnBrowse(); d%Zt]1$  
  afx_msg void OnChange(); dA[Z\  
 //}}AFX_MSG Oslbt8)U6  
 DECLARE_MESSAGE_MAP() pHlw&8(f"  
}; |1G/J[E  
#endif c+/SvRx^>  
Ij hC@5qk  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file s@C@q(i6  
#include "stdafx.h" C8%Io l  
#include "Capture.h" rrei6$H&  
#include "CaptureDlg.h" ir<HC 'D[  
#include <windowsx.h> xX`P-h>V`c  
#pragma comment(lib,"hook.lib") <qs>c<Vj  
#ifdef _DEBUG ~xqRCf{8  
#define new DEBUG_NEW &[}T41  
#undef THIS_FILE ZYoWz(  
static char THIS_FILE[] = __FILE__; T_:"~ ]  
#endif 8V%(SV  
#define IDM_SHELL WM_USER+1 GMLq3_'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); az~4sx$+}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5QU7!jb I  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; hf rF7{yj  
class CAboutDlg : public CDialog $VYMAk&\  
{ t%<nS=u  
 public: 4A:@+n%3m  
  CAboutDlg(); CRvUD.D  
  // Dialog Data ? &ew$%  
  //{{AFX_DATA(CAboutDlg) U@dztX@u  
  enum { IDD = IDD_ABOUTBOX }; 3!^5a %u  
  //}}AFX_DATA HONrt|c  
  // ClassWizard generated virtual function overrides I~EQuQ>=  
  //{{AFX_VIRTUAL(CAboutDlg) Ob2H7 !  
 protected: $Ml/=\EHOg  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support nmp(%;<exN  
  //}}AFX_VIRTUAL IB:Wh;_x  
  // Implementation wxpE5v+f|  
 protected: stz1e dP  
  //{{AFX_MSG(CAboutDlg) FLJdnL  
  //}}AFX_MSG hHF YAh   
  DECLARE_MESSAGE_MAP() .Ya]N+r*  
}; P& C,EE$  
t0p^0   
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #q40  >)]  
{ ]Qe;+p9vU  
 //{{AFX_DATA_INIT(CAboutDlg) 1SeDrzLA  
 //}}AFX_DATA_INIT .?9+1.`  
} l@nkR&4[  
2`/JT  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) KHKf+^uu  
{ MjNCn&c  
 CDialog::DoDataExchange(pDX); 9*2A}dH  
 //{{AFX_DATA_MAP(CAboutDlg) \[oU7r}?/V  
 //}}AFX_DATA_MAP 4;W eB   
} 'WkDp a  
4UmTA_& Io  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Ath^UKO"  
 //{{AFX_MSG_MAP(CAboutDlg) Ha9A5Ao}0  
 // No message handlers 1iEZ9J?  
 //}}AFX_MSG_MAP Urur/_]-%  
END_MESSAGE_MAP() 7$'%*|C.  
v;AMx-_WH  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) W+V#z8K  
: CDialog(CCaptureDlg::IDD, pParent) IZY q  
{ E6|!G  
 //{{AFX_DATA_INIT(CCaptureDlg) 'm9f:iTr  
  m_bControl = FALSE; 7 N+;K0  
  m_bAlt = FALSE; n}PK0  
  m_bShift = FALSE; )vO;=% GQ  
  m_Path = _T("c:\\"); u{xjFx-  
  m_Number = _T("0 picture captured."); 1BUdl=o>S  
  nCount=0; y^_ 'g2H  
  bRegistered=FALSE; ~,KAJ7O_  
  bTray=FALSE; YG$2ySkDhE  
 //}}AFX_DATA_INIT tJo,^fdfv  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 LivPk`[  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ork/:y9*y  
} o-2FGM`*VB  
Fv=7~6~  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) gE%{#&*  
{ ~fB}v  
 CDialog::DoDataExchange(pDX); [,)yc/{*  
 //{{AFX_DATA_MAP(CCaptureDlg) 1$oVcDLl  
  DDX_Control(pDX, IDC_KEY, m_Key); |9ro&KA  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); b}4k-hZL  
  DDX_Check(pDX, IDC_ALT, m_bAlt); i"2[OM\j7  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); &x19]?D"+  
  DDX_Text(pDX, IDC_PATH, m_Path); B4 5B`Ay  
  DDX_Text(pDX, IDC_NUMBER, m_Number); {ve86 POY  
 //}}AFX_DATA_MAP 4a]m=]Hm  
} P]gksts9f.  
j J6Yz  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) w_|R.T\7  
//{{AFX_MSG_MAP(CCaptureDlg) Z\6&5r=  
 ON_WM_SYSCOMMAND() BUB#\v#a  
 ON_WM_PAINT() D"_~Njf  
 ON_WM_QUERYDRAGICON() Z)Y--`*  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ]^MOFzSz~  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) -]c5**O}  
 ON_BN_CLICKED(ID_CHANGE, OnChange) =0 W`tx  
//}}AFX_MSG_MAP +N1oOcPC>C  
END_MESSAGE_MAP() 4} uX[~e&  
f)hs>F  
BOOL CCaptureDlg::OnInitDialog() '(A)^K>+  
{ .CH0P K=l  
 CDialog::OnInitDialog(); J&UFP{)  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ZK<kn8JJ  
 ASSERT(IDM_ABOUTBOX < 0xF000); Q/r0p>  
 CMenu* pSysMenu = GetSystemMenu(FALSE); X||Z>w}v  
 if (pSysMenu != NULL) 6J0HaL  
 { qR0V\OtgY~  
  CString strAboutMenu; 6#VG,'e3  
  strAboutMenu.LoadString(IDS_ABOUTBOX); R)?b\VK2$  
  if (!strAboutMenu.IsEmpty()) yo*c& >  
  { 9frP`4<)  
   pSysMenu->AppendMenu(MF_SEPARATOR); q+2yp&zF  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 'SF+P)Kmz  
  } ,\Gn  
 } B;t U+36nM  
 SetIcon(m_hIcon, TRUE); // Set big icon |,M&ks  
 SetIcon(m_hIcon, FALSE); // Set small icon RbX!^v<0f6  
 m_Key.SetCurSel(0); mMmzi4HL  
 RegisterHotkey(); 2f\;#-  
 CMenu* pMenu=GetSystemMenu(FALSE); e"(l  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); OD<0,r0f,  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ^c{}G<U^  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2%\Nq:; T  
 return TRUE; // return TRUE unless you set the focus to a control /!ZeMY:x  
} Ti`<,TA54  
> kOca  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) q:sDNj)R\  
{ e'aKI]>a  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) E 5}T_~-{  
 { m&o}qzC'y  
  CAboutDlg dlgAbout; Zzr+p.  
  dlgAbout.DoModal(); ^57[&{MuBF  
 } *FDz20S  
 else @<Au|l`  
 { c.jq?Q k  
  CDialog::OnSysCommand(nID, lParam);  =Run  
 } ElAJR4'{*i  
} m! &bK5+*  
fEc}c.!5  
void CCaptureDlg::OnPaint() %Q"zU9  
{ , M$*c  
 if (IsIconic()) x-+[gNc 6  
 { :Bp{yUgi@  
  CPaintDC dc(this); // device context for painting 84tuN  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); w=\Lw+X  
  // Center icon in client rectangle |o~<Ti6]  
  int cxIcon = GetSystemMetrics(SM_CXICON); x^_Wfkch]  
  int cyIcon = GetSystemMetrics(SM_CYICON); 5P{dey!  
  CRect rect; t+Mr1e  
  GetClientRect(&rect); 1Lwi?~!LI  
  int x = (rect.Width() - cxIcon + 1) / 2; )xCpQ=nS  
  int y = (rect.Height() - cyIcon + 1) / 2; (u85$_C  
  // Draw the icon ! e6;@*  
  dc.DrawIcon(x, y, m_hIcon); D.)$\Caq  
 } 7|PpAvMF  
 else XG<J'3  
 { I^/Ugu  
  CDialog::OnPaint(); JGt4B  
 } V S2p"0$3D  
} qRsPi0;  
H? N!F7s  
HCURSOR CCaptureDlg::OnQueryDragIcon() _6THyj$f  
{ n|NI]Qi*  
 return (HCURSOR) m_hIcon; 5R4h9D5  
} I%%\;Dy  
<oV _EZ  
void CCaptureDlg::OnCancel() U jVo "K  
{ t)g1ICt  
 if(bTray) e.G&hJ r  
  DeleteIcon(); ZA>hN3fE'  
  CDialog::OnCancel(); yXY8 o E  
} NAV}q<@v  
Z<En3^j`  
void CCaptureDlg::OnAbout() tc@v9`^_  
{ -"Lia!Q]M  
 CAboutDlg dlg; 8kAG EiC  
 dlg.DoModal(); !l~tBJr*sB  
} td q;D  
~FH''}3:3  
void CCaptureDlg::OnBrowse() &GwBxJ  
{ 2|tZ xlt-  
 CString str; _]1dm)%  
 BROWSEINFO bi; n5 @H  
 char name[MAX_PATH]; hnL"f[p@gC  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); -x3QgDno  
 bi.hwndOwner=GetSafeHwnd(); Um;ReJ8z  
 bi.pszDisplayName=name; /#9O{)  
 bi.lpszTitle="Select folder"; Po&gr@e.V  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; B9iH+ ]W  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); wED~^[]f  
 if(idl==NULL) W>dS@;E  
  return; 9+@_ZI-  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); $q DH  
 str.ReleaseBuffer(); "KOLRJ@  
 m_Path=str; P^v`5v  
 if(str.GetAt(str.GetLength()-1)!='\\') ?ZdHuuDN~  
  m_Path+="\\"; 2{"Wa|o`  
 UpdateData(FALSE); NeCTEe|V  
} ?Z( 6..&  
y2\, L  
void CCaptureDlg::SaveBmp() {4CkF \  
{ P`[6IS#\S  
 CDC dc; qOZe\<.V<  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ]. 1[H~5N  
 CBitmap bm; 9g"a`a?c  
 int Width=GetSystemMetrics(SM_CXSCREEN); D!J ("~[3  
 int Height=GetSystemMetrics(SM_CYSCREEN); @]WN|K  
 bm.CreateCompatibleBitmap(&dc,Width,Height); NJs )2  
 CDC tdc; )Y Qtrc\91  
 tdc.CreateCompatibleDC(&dc); L\nWhmwl  
 CBitmap*pOld=tdc.SelectObject(&bm); >8t3a-/  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); & @^|=>L  
 tdc.SelectObject(pOld); lj@c"Yrk  
 BITMAP btm; O9=vz%  
 bm.GetBitmap(&btm); N#C,_ k  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; xlqRW"  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); cQu1WgQ G  
 BITMAPINFOHEADER bih; vNd4Fn)H  
 bih.biBitCount=btm.bmBitsPixel; uV52ko,  
 bih.biClrImportant=0; ^=pn!lK;^  
 bih.biClrUsed=0; bCdEItcD  
 bih.biCompression=0; [#)-F_S  
 bih.biHeight=btm.bmHeight; $eX; 2  
 bih.biPlanes=1; h/V0}|b  
 bih.biSize=sizeof(BITMAPINFOHEADER); ZR6KE_  
 bih.biSizeImage=size; \2: JX?Jw!  
 bih.biWidth=btm.bmWidth; |0B h  
 bih.biXPelsPerMeter=0; wCkhE,#-_  
 bih.biYPelsPerMeter=0; @/`b:sv&*  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Z99%uI3  
 static int filecount=0; \.9-:\'(  
 CString name; QlSZr[^v  
 name.Format("pict%04d.bmp",filecount++); v#(wc +[  
 name=m_Path+name; M!,$i  
 BITMAPFILEHEADER bfh; [j eZZB  
 bfh.bfReserved1=bfh.bfReserved2=0; )e4nKh],  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 5bH@R@3m  
 bfh.bfSize=54+size; D/9&pRsO  
 bfh.bfOffBits=54; ,l#V eC  
 CFile bf; x>!#8?-h  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1 BAnf9  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); fN?HF'7V  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 3E+u)f lmB  
  bf.WriteHuge(lpData,size); @Ej{sC!0T  
  bf.Close(); 9H" u\t|?  
  nCount++; ds4ERe /  
 } km}%7|R?  
 GlobalFreePtr(lpData); Yr ,e7da  
 if(nCount==1) DKF`uRvGN:  
  m_Number.Format("%d picture captured.",nCount); yg5Ik{  
 else H--(zxK  
  m_Number.Format("%d pictures captured.",nCount); 2J|Wbey  
  UpdateData(FALSE); p3\F1](Z  
} w6qx  
@2L+"=u#  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) {Tm31f(oD  
{ Mf<P ms\F  
 if(pMsg -> message == WM_KEYDOWN) \6T&gX  
 { `(q+@#)  
  if(pMsg -> wParam == VK_ESCAPE) vO&%sjvH  
   return TRUE; K`M8[ %S  
  if(pMsg -> wParam == VK_RETURN) =CFO]9  
   return TRUE; *FQrmdwb]L  
 } "/S-+Ufn  
 return CDialog::PreTranslateMessage(pMsg); /Pxt f~$  
} `$AX!,<!G  
W+cmn)8  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @v2_gjRe  
{ y['$^T?oP  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ]KA|};>ow  
  SaveBmp(); <KoiZ{V   
  return FALSE; P@`@?kMU  
} sPyq.oG  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ G yvEc3|@  
 CMenu pop; o 3#qp>R  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [GyW1-p33w  
 CMenu*pMenu=pop.GetSubMenu(0); >KNiMW^V  
 pMenu->SetDefaultItem(ID_EXITICON); ~dkS-6q~Q  
 CPoint pt; ;/XWX$G@  
 GetCursorPos(&pt); MXh0a@*]  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 7YV}F9h4  
 if(id==ID_EXITICON) Ovxs+mQ  
  DeleteIcon(); "iMuA  
 else if(id==ID_EXIT) 9f\Lon4lX  
  OnCancel(); -lQ8 &eB  
 return FALSE; ^a0{"|Lq  
} [i== Tp  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 2`9e20  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) AU -,  
 AddIcon(); 6U Q~Fv`]  
 return res; }xk85*V  
} b(Zh$86  
6 6(|3DX  
void CCaptureDlg::AddIcon() W4%I%&j  
{ p[2`H$A  
 NOTIFYICONDATA data; )"/.2S;  
 data.cbSize=sizeof(NOTIFYICONDATA); 3yX^93  
 CString tip; pZ,=iqr  
 tip.LoadString(IDS_ICONTIP); M+j V`J!  
 data.hIcon=GetIcon(0); 6!sC  
 data.hWnd=GetSafeHwnd(); sG7G$G*ta!  
 strcpy(data.szTip,tip); 4W5[1GE.  
 data.uCallbackMessage=IDM_SHELL; Ngi] I#V z  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; w j !YYBH  
 data.uID=98; !'8.qs  
 Shell_NotifyIcon(NIM_ADD,&data); >r1cW7  
 ShowWindow(SW_HIDE); mM0VUSy  
 bTray=TRUE; BCMQ^hP}t  
} >o9tlO)  
i/E"E7  
void CCaptureDlg::DeleteIcon() .)59*'0  
{ $ @g\wz  
 NOTIFYICONDATA data; aO)Cq5  
 data.cbSize=sizeof(NOTIFYICONDATA); Tsg;i;  
 data.hWnd=GetSafeHwnd(); c|m*< i  
 data.uID=98; bWWZGl9  
 Shell_NotifyIcon(NIM_DELETE,&data); $ha,DlN  
 ShowWindow(SW_SHOW); )-VpDW!%_  
 SetForegroundWindow(); ]dIcW9a  
 ShowWindow(SW_SHOWNORMAL); "'U+T:S  
 bTray=FALSE; (SGX|,5X7  
} GB,f'Afl  
%])U(  
void CCaptureDlg::OnChange() lt08 E2p9  
{ #0$fZ  
 RegisterHotkey(); Yw=7(}  
} @=r YOQj |  
$0 ]xeD0X  
BOOL CCaptureDlg::RegisterHotkey() c(Ws3  
{ ~H`m"4zQ  
 UpdateData(); 7}#zF]vHNi  
 UCHAR mask=0; j/ [V<  
 UCHAR key=0; jKr\mb  
 if(m_bControl) 4N6JKS  
  mask|=4; Rax]svc  
 if(m_bAlt) &~=FX e0S  
  mask|=2; DpQ\q;  
 if(m_bShift) 7<GC{/^T  
  mask|=1; *!oV?N[eA'  
  key=Key_Table[m_Key.GetCurSel()]; =$mPReA3v  
 if(bRegistered){ Gb!R>WY  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); y'L7o V?L9  
  bRegistered=FALSE; ^+p7\D/E(  
 } cY mgJBG  
 cMask=mask; aAKwC01?  
 cKey=key; cl04fqX  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Ef @  
 return bRegistered; QjOO^6Fh  
} ,>+B>lbJ*  
%>'Zy6C<j  
  四、小结 iX%9$Bft<  
=E.!Ff4~(  
  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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