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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: <_f`$z  
  ,TJ/3_lH  
  一、实现方法 ^^ j/  
ux&:Rw\  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: "GLYyC  
O*4gV}:G  
#pragma data_seg("shareddata") +3HPA#A  
HHOOK hHook =NULL; //钩子句柄 5U;nhDmM  
UINT nHookCount =0; //挂接的程序数目 1t%<5O;R  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 2*YP"Ryh  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 zP|*(*  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ?w8p LE~E  
static int KeyCount =0; 2 mq%|VG'  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 X?kPi&ru  
#pragma data_seg() neIy~H_#!  
c&A]pLn+x  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 h=Oh9zsz8  
cUNGo%Y  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: :Lc3a$qtx5  
wmiafBA e  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ^ `E@/<w8  
cKey,UCHAR cMask) Y8t Nwh  
{ N[]U%9[=2F  
 BOOL bAdded=FALSE; !4L#$VG  
 for(int index=0;index<MAX_KEY;index++){ Lv^a+'  
  if(hCallWnd[index]==0){ sxt`0oE  
   hCallWnd[index]=hWnd; w2@"PGR  
   HotKey[index]=cKey; %p}qO^%M  
   HotKeyMask[index]=cMask; *seu&  
   bAdded=TRUE; jPj 2  
   KeyCount++; ^xmZ|f-  
   break; B'!PJj  
  } <gR`)YF7  
 } TXx'7[  
 return bAdded; yX3PUO9  
} o;*]1  
//删除热键 FE>3 D1\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *|@+rbjVC  
{ \N4d_ fPj  
 BOOL bRemoved=FALSE; Plb}dID"  
 for(int index=0;index<MAX_KEY;index++){ TJE% U0Ln  
  if(hCallWnd[index]==hWnd){ $e>/?Ss  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ kz$(V(k<  
    hCallWnd[index]=NULL; >@z d\}@W  
    HotKey[index]=0; 2(hvv-  
    HotKeyMask[index]=0; ~NA1SZ{Y+  
    bRemoved=TRUE; HUK" OH  
    KeyCount--; R9bhC9NP  
    break; w< v1 N  
   } hyM'x*  
  } (/('nY  
 } d\\r_ bGW  
 return bRemoved; (21']x  
} >7"$}5d  
Q%+ }  
,0BR-#  
  DLL中的钩子函数如下: poTl|y @  
RfD{g"]y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) C{8i7D  
{ c6f|y_ 2  
 BOOL bProcessed=FALSE; f<'n5}{RO0  
 if(HC_ACTION==nCode) @Q/x&BV  
 { mx:J>SPA8  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 R|nEd/' <  
   switch(wParam) @gH(/pFX  
   {  U? {'n#n 5  
    case VK_MENU: =fL6uFmxI@  
     MaskBits&=~ALTBIT; v<{wA`'R+  
     break; F_ ,L 2J  
    case VK_CONTROL: J'I1,5(  
     MaskBits&=~CTRLBIT; R.91v4 J  
     break; dCa}ITg  
    case VK_SHIFT: <WZ1-  
     MaskBits&=~SHIFTBIT; "PZYgl  
     break; x{=[w`  
    default: //judge the key and send message /'R UA  
     break; k&MlQ2'!<  
   } 4 *Bp  
   for(int index=0;index<MAX_KEY;index++){ + 9F^F>mu  
    if(hCallWnd[index]==NULL) fO[Rf_  
     continue; 5%2ef{T[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,k4z;  
    { l,imT$u  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); "z^BKb5  
     bProcessed=TRUE; Z}sG3p  
    } +^/Nil  
   } VQ1?Db(_2  
  } z*Myokhf  
  else if((lParam&0xc000ffff)==1){ //有键按下 ?)Tz'9l  
   switch(wParam) DQ}_9?3  
   { 7xLo 4  
    case VK_MENU: kA7~Yu5|  
     MaskBits|=ALTBIT; Hv[d<ylO  
     break; OVDMC4K2z!  
    case VK_CONTROL: &(5^v w<0  
     MaskBits|=CTRLBIT; XV74F l  
     break; .Ws iOJU  
    case VK_SHIFT: "7To c4  
     MaskBits|=SHIFTBIT; aHBByH  
     break; x:f|3"\s  
    default: //judge the key and send message L#t-KLJ  
     break; ^ I{R[O'8  
   } .fio<mqi  
   for(int index=0;index<MAX_KEY;index++){ H]% mP|  
    if(hCallWnd[index]==NULL) ^yn[QWFO  
     continue; :0J-ek.;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ff)~clIK '  
    { 'DL;c@}37  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); qB+:#Yrx/  
     bProcessed=TRUE; ,xAM[h&  
    } (5f5P84x  
   } USnD7I/b  
  } *3w/`R<\  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 .LeF|EQU\@  
   for(int index=0;index<MAX_KEY;index++){ "6`)vgI~  
    if(hCallWnd[index]==NULL) R` I8Ud4=  
     continue; ~aauW?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) gTmUK{y'  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); k$UzBxR  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 =\ti<  
   } ;qMnO_ E  
  } /ygUd8@  
 } '-nuH;r  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); zJy 89ib'  
} 'b=eC  
"lv:hz  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: H}jK3;8E  
%U=S6<lbj;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6KIjq[T^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); M0;t%*1  
3zA8pI w  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ])$. "g  
^H\-3/si*  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (IoPU+1b  
{ N:PA/V^z  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) % L %1g  
 { 0bnVIG2q  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Rktn/Vi  
  SaveBmp(); }0Kqy;  
  return FALSE; 6'No4[F 4n  
 } Vtz yB  
 …… //其它处理及默认处理 lkSz7dr@  
} DiYJlD&  
_Pfx_+  
:~0^ib<v;  
  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。 cvs"WX3  
<mo^Y k3  
  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。 ) v[Knp'  
vS J<  
  二、编程步骤 x^='pEt{  
G0 nH Z6  
  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"; ik1L  
Z_^Kl76D  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ax{-Qi7z-+  
8x^H<y=O  
  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; ~Q$c!=   
YP\4XI  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; g]@R'2:1  
=:n[{/O=  
  5、 添加代码,编译运行程序。 ]=86[A-2N  
#/B~G.+(  
三、程序代码 >;'1k'  
wJeqa  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL h@>rjeY@  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9tc@   
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ R0YC:rAt  
#if _MSC_VER > 1000 &PQ{e8w  
#pragma once dV2b)p4J  
#endif // _MSC_VER > 1000 vu.S>2Wv  
#ifndef __AFXWIN_H__ [@. jL0>  
#error include 'stdafx.h' before including this file for PCH Ng;b!S  
#endif Am=PUQF$  
#include "resource.h" // main symbols YI),q.3X~  
class CHookApp : public CWinApp Kt* za  
{ Uhx2 _  
 public: A^Hp#b @  
  CHookApp(); A Fm*60C  
  // Overrides seD+~Y\z  
  // ClassWizard generated virtual function overrides >A'!T'"~  
  //{{AFX_VIRTUAL(CHookApp) z5*O@_r+.b  
 public: | C2.Zay  
  virtual BOOL InitInstance(); u, SX`6%  
  virtual int ExitInstance(); l& ^B   
  //}}AFX_VIRTUAL -ZoOX"N}  
  //{{AFX_MSG(CHookApp) vVN[bD<  
  // NOTE - the ClassWizard will add and remove member functions here. +!V%Q  
  // DO NOT EDIT what you see in these blocks of generated code ! "RJk7]p`*  
  //}}AFX_MSG f+*2K^B  
  DECLARE_MESSAGE_MAP() ~ {7N TW  
}; 8^"|-~#<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ~z1KD)^   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); eg~^wi  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); sK9h=J;F/  
BOOL InitHotkey(); k&"qdB(I  
BOOL UnInit(); tA u|8aL  
#endif UCj#t!Mw  
a3 _0F@I  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. nu9k{owB T  
#include "stdafx.h" uy-Ncy  
#include "hook.h" ]jY)M<:J4  
#include <windowsx.h> y`@4n.Q  
#ifdef _DEBUG NizJq*V>  
#define new DEBUG_NEW WT {Cjn  
#undef THIS_FILE 'nDT.i  
static char THIS_FILE[] = __FILE__; |2&mvjk@H  
#endif ;WAu]C|  
#define MAX_KEY 100 Z!i'Tbfn  
#define CTRLBIT 0x04 <fxjj  
#define ALTBIT 0x02 Jsnmn$C  
#define SHIFTBIT 0x01 lR K ?%~  
#pragma data_seg("shareddata") ~t3?er& R  
HHOOK hHook =NULL; :8L61d2(  
UINT nHookCount =0; k'q !MZU  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey m1; <T@  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT o%>nu  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 4sE=WPKF#  
static int KeyCount =0; 8=Y|B5   
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift N)y;owgo  
#pragma data_seg() )3\rp$]1  
HINSTANCE hins; XUNgt(OGR'  
void VerifyWindow(); vCo}-b-j  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 3:Egqw  
//{{AFX_MSG_MAP(CHookApp) p;Ok.cXVp  
// NOTE - the ClassWizard will add and remove mapping macros here. `l0icfy  
// DO NOT EDIT what you see in these blocks of generated code! IX3 yNTW"L  
//}}AFX_MSG_MAP ct/THq  
END_MESSAGE_MAP() s"F,=]HQ!G  
K{h]./%  
CHookApp::CHookApp() G%/cV?18  
{ pnb$lpxt  
 // TODO: add construction code here, / ^M3-5@Q  
 // Place all significant initialization in InitInstance }33Au-%*  
} JkEQ@x  
F+^[8zK^  
CHookApp theApp; 93 b5S>&r  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Qnc S&  
{ T js{ )r9  
 BOOL bProcessed=FALSE; SygsZv&LZ  
 if(HC_ACTION==nCode) OU=IV;V{  
 { ?& ^l8gE  
  if((lParam&0xc0000000)==0xc0000000){// Key up UM^hF%  
   switch(wParam) ~a)2 0  
   { $jL.TraV7  
    case VK_MENU: Ase1R=0  
     MaskBits&=~ALTBIT; goWt!,&f  
     break; 5Z0x2 jV  
    case VK_CONTROL: x6P^IkL:  
     MaskBits&=~CTRLBIT; >CA1Ub&ls  
     break; 1x 8]&  
    case VK_SHIFT: z`6KX93  
     MaskBits&=~SHIFTBIT; 2)H|/  
     break; yZ6X$I:C  
    default: //judge the key and send message I*t}gvUt9  
     break; 32J  
   } 'a9.JS[pj  
   for(int index=0;index<MAX_KEY;index++){ '?[msX"aqa  
    if(hCallWnd[index]==NULL) a#@ opUn-  
     continue; KJ |1zCM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {<Zqw]  
    { z}|'&O*.F  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); v7RDoO]I  
     bProcessed=TRUE; riQ?'!a7  
    } ,s<d"]<  
   } E_#&L({|@  
  } cwM0Z6  
  else if((lParam&0xc000ffff)==1){ //Key down r4'Pf|`u  
   switch(wParam) !ym5' h  
   { f:>jH+o.S  
    case VK_MENU: QX/`s3N  
     MaskBits|=ALTBIT; dv: &N  
     break; B$n\m854  
    case VK_CONTROL: $~l :l[Zs  
     MaskBits|=CTRLBIT; /_HL&|N_5  
     break; 2^:nlM{u  
    case VK_SHIFT: CK%W +";  
     MaskBits|=SHIFTBIT; }s9J+m  
     break; 37DvI&  
    default: //judge the key and send message fNumY|%3  
     break; TW$^]u~v  
   } XPSWAp)  
   for(int index=0;index<MAX_KEY;index++) ]y/:#^M+  
   { nfEk,(:  
    if(hCallWnd[index]==NULL) ) eV]M~K:  
     continue; 6{ Eh={:b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w ;O '6"  
    { Uk#1PcPd  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); mv_-|N~  
     bProcessed=TRUE; :/08}!_:  
    } (G Y`O  
   } ]H*=Z:riu  
  } hi%>&i*  
  if(!bProcessed){ 7UiU3SUcg  
   for(int index=0;index<MAX_KEY;index++){ F$v G=3  
    if(hCallWnd[index]==NULL) ] N8V?.|:  
     continue; y[# U/2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) b?l\Q Mvi  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); G}g+2`  
   } pbNVj~#6  
  } n/-I7Q!;u  
 } c|XnPqo;f  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); : s35{K  
} f#?R!pR  
G!uxpZ   
BOOL InitHotkey() BC3I{Y |  
{ ]`x~v4JU  
 if(hHook!=NULL){ '?nhpT^  
  nHookCount++; eL*Edl|#  
  return TRUE; [F e5a  
 } L=>N#QR7  
 else *Zln\Sx  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); (,k=mF  
  if(hHook!=NULL) o{/D:B  
   nHookCount++; U-(d~]$  
  return (hHook!=NULL); d+kIof,  
} UCFef,VW  
BOOL UnInit() dCBJV  
{ t_3XqjuA  
 if(nHookCount>1){ QAr1U7{(.  
  nHookCount--; 1*s Lj#  
  return TRUE; BX?Si1c  
 } }Q*8QV  
 BOOL unhooked = UnhookWindowsHookEx(hHook); !GO4cbdQ  
 if(unhooked==TRUE){ rd6?;K0  
  nHookCount=0; Ood&cP'c  
  hHook=NULL; |&7l*j(\  
 } :jA~zHO  
 return unhooked; Q%6*S!~  
} %NKf@If)  
m$3&r2vgi  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) i;cqK&P;]  
{ *5 5yF `  
 BOOL bAdded=FALSE; H}d&>!\}F  
 for(int index=0;index<MAX_KEY;index++){ { Uh/ ~zu  
  if(hCallWnd[index]==0){ >zhbOkR9c  
   hCallWnd[index]=hWnd; h[Hw9$31  
   HotKey[index]=cKey; <~]s+"oVc  
   HotKeyMask[index]=cMask; qT(j%F  
   bAdded=TRUE; hD"Tjd` P  
   KeyCount++; IRLT -  
   break; 6j0!$q^  
  } R/iXO~/"J  
 } +Oo>V~  
 return bAdded; YS &3+Tp  
} #=h~Lr'UH  
f>dWl$/_s  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) m)&2zV/Q  
{ z@dHXj )  
 BOOL bRemoved=FALSE; J 5~bs*a8  
 for(int index=0;index<MAX_KEY;index++){ Y~,N,>nITu  
  if(hCallWnd[index]==hWnd){ .(D-vkz'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2\_}81 hM  
    hCallWnd[index]=NULL; lO[[iMHl<  
    HotKey[index]=0; Go8 m  
    HotKeyMask[index]=0; >Qr(#Bt)  
    bRemoved=TRUE; .:E%cL +h  
    KeyCount--; @xR=bWY  
    break; yqZKn=1:  
   } ftRf~5d2  
  } |-bAz t  
 } Y}QtgZEt  
 return bRemoved; aVEg%8  
} qh{hpX)\D  
h?jKq2`  
void VerifyWindow() R]H/Jv\'  
{ ~0eJ6i  
 for(int i=0;i<MAX_KEY;i++){ O1V s!  
  if(hCallWnd!=NULL){ X&b)E0]pR  
   if(!IsWindow(hCallWnd)){ Ny\p$v "p  
    hCallWnd=NULL; /3{jeU.k  
    HotKey=0; R^4JM,v9x`  
    HotKeyMask=0; eh`n?C  
    KeyCount--; !/2u O5  
   } R1)v;^B|)  
  } RG4T9eZq  
 } ^z>3+oi  
} 6B'd]Fe  
$DBJ"8n2  
BOOL CHookApp::InitInstance() P :zZ  
{ 1ayL*tr  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); u 6A!Sw  
 hins=AfxGetInstanceHandle(); #l2KJ7AMK  
 InitHotkey(); YBF|0A{[Y  
 return CWinApp::InitInstance(); AUBZ7*VO  
} WTK )SKa,.  
G*`Y~SJp  
int CHookApp::ExitInstance() \\}tD@V"  
{ vuN!7*d+  
 VerifyWindow(); <u`m4w  
 UnInit(); U~H]w ,^  
 return CWinApp::ExitInstance(); (@X].oM^y  
} w`ebZa/j  
x`9IQQ  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file xQ~}9Kt\  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) &-.NkW@  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ nz+k ,  
#if _MSC_VER > 1000 BeFCt;  
#pragma once .A%*AlX  
#endif // _MSC_VER > 1000 tg5G`P5PJ  
( &N`N1  
class CCaptureDlg : public CDialog !I)wI~XF)5  
{ <+3-(&  
 // Construction :9?y-X  
 public: <gfkbDP2  
  BOOL bTray; dkUh[yo"H  
  BOOL bRegistered; uz U2)n3y  
  BOOL RegisterHotkey(); ^&8FwV]  
  UCHAR cKey; 'j&+Pg)@  
  UCHAR cMask; v2K6y|6,  
  void DeleteIcon(); ;Gnk8lIsb  
  void AddIcon(); P80mK-Iyv_  
  UINT nCount; ~3'}^V\  
  void SaveBmp(); xQU$E|I  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor BU;o$"L  
  // Dialog Data 1[4 2f#  
  //{{AFX_DATA(CCaptureDlg) Q95`GuI@  
  enum { IDD = IDD_CAPTURE_DIALOG }; K (px-jY  
  CComboBox m_Key; 'cgB$:T}.,  
  BOOL m_bControl; { VK   
  BOOL m_bAlt; t?l0L1;  
  BOOL m_bShift; =hAH6C  
  CString m_Path; (Vz\02,K  
  CString m_Number; GI. =\s  
  //}}AFX_DATA J>w3>8!>7  
  // ClassWizard generated virtual function overrides f?Am)  
  //{{AFX_VIRTUAL(CCaptureDlg) e^%>_U  
 public: P&$ m2^K  
  virtual BOOL PreTranslateMessage(MSG* pMsg); DuvI2Z WP]  
 protected: .).}ffhOL  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support IVY{N/ 3|  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); a@?2T,$  
  //}}AFX_VIRTUAL $v \@mW*R  
  // Implementation 42B_8SK  
 protected: wgPkSsuBuC  
  HICON m_hIcon; #)BbW40f6  
  // Generated message map functions ^.?5!9U  
  //{{AFX_MSG(CCaptureDlg) ;)7GdR^K  
  virtual BOOL OnInitDialog(); 8`]1Nt!*B  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); lk(.zYaaN  
  afx_msg void OnPaint(); a9%^Jvm"  
  afx_msg HCURSOR OnQueryDragIcon(); D-KQRe2@  
  virtual void OnCancel(); vQ_D%f4;  
  afx_msg void OnAbout(); {vf4l4J(  
  afx_msg void OnBrowse(); =jEh#  
  afx_msg void OnChange(); 77?D ~N[  
 //}}AFX_MSG ]IQ`.:g=9  
 DECLARE_MESSAGE_MAP() 0Z,a3)jcc  
}; ,z@"pI b  
#endif 0 v> *P*  
%HWebZ-yY  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 6jaol'{SuH  
#include "stdafx.h" %Bf;F;xuB  
#include "Capture.h" sgxD5xj}4  
#include "CaptureDlg.h" > 3SZD  
#include <windowsx.h> yE{(Ebm  
#pragma comment(lib,"hook.lib") 2Y-NxW^]  
#ifdef _DEBUG ~u^MRe|`  
#define new DEBUG_NEW G\4*6iw:  
#undef THIS_FILE {wq~+O  
static char THIS_FILE[] = __FILE__; _Yqog/sG  
#endif W! =X _  
#define IDM_SHELL WM_USER+1 Ro:DAxi @L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); y(92Th$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); lHI ;fR  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; \.l8]LH  
class CAboutDlg : public CDialog h,!`2_&UQ  
{ |08'd5  
 public: >u=Dc.lX  
  CAboutDlg(); kS)azV  
  // Dialog Data Yb? L:,a(I  
  //{{AFX_DATA(CAboutDlg) j8[RDiJ  
  enum { IDD = IDD_ABOUTBOX }; }\Ri:&?  
  //}}AFX_DATA 1Vi3/JM @  
  // ClassWizard generated virtual function overrides q37d:Hp  
  //{{AFX_VIRTUAL(CAboutDlg) xk\n F0z  
 protected: *^=zQ~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support T P#Hq  
  //}}AFX_VIRTUAL >\s8S}p  
  // Implementation [PP &}.k4"  
 protected: *{fL t  
  //{{AFX_MSG(CAboutDlg) {I^@BW-  
  //}}AFX_MSG 2Q81#i'Cm  
  DECLARE_MESSAGE_MAP() - :~"c@D  
}; [==x4N b  
)z=L^ot  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) hg Pzx@  
{ k,GAHM"'  
 //{{AFX_DATA_INIT(CAboutDlg) HB:VpNFn  
 //}}AFX_DATA_INIT jBLLx{  
} 7B s:u  
eJ3;Sd''  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) BH3%dh :9  
{ hcX`X2^  
 CDialog::DoDataExchange(pDX); XN %tcaY  
 //{{AFX_DATA_MAP(CAboutDlg) UY~N4IR8  
 //}}AFX_DATA_MAP /O {iL:`  
} $Si|;j$?  
`c.P`@KA  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +JlPQ~5  
 //{{AFX_MSG_MAP(CAboutDlg) {\p&?  
 // No message handlers sp8P[W1a  
 //}}AFX_MSG_MAP &qMt07  
END_MESSAGE_MAP() MiN|u  
y*7{S{9  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) /Dj-@7.C/  
: CDialog(CCaptureDlg::IDD, pParent) .9VhDrCK  
{ w:HRzU>  
 //{{AFX_DATA_INIT(CCaptureDlg) d3jzGJrU}  
  m_bControl = FALSE; Cc}3@Nf{/  
  m_bAlt = FALSE; @O9wit.  
  m_bShift = FALSE; . /@C  
  m_Path = _T("c:\\"); @Pb%dS  
  m_Number = _T("0 picture captured."); 8k9Yoht  
  nCount=0; 8{DW$Z tR  
  bRegistered=FALSE; *|({(aZ  
  bTray=FALSE; GWW#\0*Bn  
 //}}AFX_DATA_INIT ]Il}ymkIZ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 j^6,V\;l  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Wf{&D>  
} +. tcEbFL  
Zt ;u8O  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ',m!L@7M5  
{ vWVQ8S.  
 CDialog::DoDataExchange(pDX); #&,~5  
 //{{AFX_DATA_MAP(CCaptureDlg) 1qm _Qs&  
  DDX_Control(pDX, IDC_KEY, m_Key); TH>7XK<90M  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ,buo&DT{L  
  DDX_Check(pDX, IDC_ALT, m_bAlt); bZ[ay-f6oK  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); uFnq3m^u  
  DDX_Text(pDX, IDC_PATH, m_Path); ZLlAK?N  
  DDX_Text(pDX, IDC_NUMBER, m_Number); OMm'm\+/  
 //}}AFX_DATA_MAP 3eN(Sw@p  
} yi:1cLq2  
k2:mIp\  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) M,sZ8eeq  
//{{AFX_MSG_MAP(CCaptureDlg) rYO~/N  
 ON_WM_SYSCOMMAND() ![ @i+hl  
 ON_WM_PAINT() DbrK, 'b%  
 ON_WM_QUERYDRAGICON() jhB+ ]  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 8d[!"lL  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 1xjw=  
 ON_BN_CLICKED(ID_CHANGE, OnChange) eCwR }m?_  
//}}AFX_MSG_MAP M5c *vs  
END_MESSAGE_MAP() ZO& F15$P  
Sh(XFUJ  
BOOL CCaptureDlg::OnInitDialog() `teaE7^Wm  
{ # B@*-  
 CDialog::OnInitDialog(); FF~VV<a  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); C j:  
 ASSERT(IDM_ABOUTBOX < 0xF000); >o5eyi  
 CMenu* pSysMenu = GetSystemMenu(FALSE); N4w&g-  
 if (pSysMenu != NULL) b5?k)s2  
 { 3Gt@Fo=  
  CString strAboutMenu; 1?{w~cF}  
  strAboutMenu.LoadString(IDS_ABOUTBOX); v-XB\|f  
  if (!strAboutMenu.IsEmpty()) (d#W3  
  { J<-2dvq  
   pSysMenu->AppendMenu(MF_SEPARATOR); q(Zu;ecBN  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); kY#sQz}8  
  } @] 3`S  
 } N:UA+  
 SetIcon(m_hIcon, TRUE); // Set big icon Z4{~  
 SetIcon(m_hIcon, FALSE); // Set small icon }0 =gP?.kE  
 m_Key.SetCurSel(0); /JmWiBQIn  
 RegisterHotkey(); VL2ACv(  
 CMenu* pMenu=GetSystemMenu(FALSE); vjd;*ORB  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); #R# |hw  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); QA#Jx  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); oD_#oX5\  
 return TRUE; // return TRUE unless you set the focus to a control Q#}c5TjVr  
} 2YpJ4.  
FmhN*ZXr #  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) M 9/J!s  
{ 7-c3^5gn{  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) X@Yl<9|i  
 { "2GssBa  
  CAboutDlg dlgAbout; c{!XDiT]P  
  dlgAbout.DoModal(); <v$yXA  
 } ^vc#)tm5p  
 else Z'_EX7r  
 { 5 0<  
  CDialog::OnSysCommand(nID, lParam); ju(QSZ|;  
 } e`;U9Z  
} kx07Ium  
ya'OI P `  
void CCaptureDlg::OnPaint() ;\gHFG}  
{ =QW:},sp  
 if (IsIconic()) CxJH)H$  
 { Uc5BNk7<=  
  CPaintDC dc(this); // device context for painting k[/`G5  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); |=#uzp7*  
  // Center icon in client rectangle HKYJgx  
  int cxIcon = GetSystemMetrics(SM_CXICON); pF'M  
  int cyIcon = GetSystemMetrics(SM_CYICON); |"k+j_/+  
  CRect rect; @H|3e@5([  
  GetClientRect(&rect); Cm[^+.=I  
  int x = (rect.Width() - cxIcon + 1) / 2; crRYgr  
  int y = (rect.Height() - cyIcon + 1) / 2; pR7D3Q:^7  
  // Draw the icon Hb@PQcj  
  dc.DrawIcon(x, y, m_hIcon); {KM5pK?,BJ  
 } Uf<IXx&;  
 else j(];b+>  
 { %<;PEQQ|C  
  CDialog::OnPaint(); 7A4_b8  
 } >l(|c9OWM  
} N.|uPq$R  
jHBP:c  
HCURSOR CCaptureDlg::OnQueryDragIcon() 5)<}a&;{  
{ Oh/2$72  
 return (HCURSOR) m_hIcon; k+y>xI,  
} H@BU/{  
aDVBi: _  
void CCaptureDlg::OnCancel() ^fT?(y_= e  
{ cA25FD  
 if(bTray) /|aD,JVN"  
  DeleteIcon(); 46M?Gfd,X  
  CDialog::OnCancel(); GB` G(a  
} =aJb}X  
Ah1fcXED  
void CCaptureDlg::OnAbout() kc}&\y  
{ ff.;6R\  
 CAboutDlg dlg; 88M$mjx  
 dlg.DoModal(); ew\ZFqA;  
} 6YpP/ K  
TaE&8;H#N  
void CCaptureDlg::OnBrowse() +N>&b%  
{ @#KZ2^  
 CString str; &/tGT3)  
 BROWSEINFO bi; o+ 0"@B  
 char name[MAX_PATH]; R,KoymXP  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); PxiJ R[a  
 bi.hwndOwner=GetSafeHwnd(); <R @w0b>  
 bi.pszDisplayName=name; >Mc,c(CvU  
 bi.lpszTitle="Select folder"; sU 5/c|&  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; = , ^eQZR:  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); CiTjRJ-ZW)  
 if(idl==NULL) 2'5%EQW;0y  
  return; ^E`SR6_cmj  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); p:CpY'KV_  
 str.ReleaseBuffer(); zTQTmO  
 m_Path=str; L>1i~c&V  
 if(str.GetAt(str.GetLength()-1)!='\\') 9_<>#)u5  
  m_Path+="\\"; l8Ks{(wh  
 UpdateData(FALSE); Qg' {RAV8  
} '+*{u]\  
yp.\KLq8)  
void CCaptureDlg::SaveBmp() y7WO:X&  
{ >)p8^jX   
 CDC dc; MH=;[| N  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); f=/IwMpn  
 CBitmap bm; j`pX2S  
 int Width=GetSystemMetrics(SM_CXSCREEN); ^P !} "  
 int Height=GetSystemMetrics(SM_CYSCREEN); w5tcO%+k1  
 bm.CreateCompatibleBitmap(&dc,Width,Height); wYIlp  
 CDC tdc; ,z+7rl  
 tdc.CreateCompatibleDC(&dc); uDXRw*rTv  
 CBitmap*pOld=tdc.SelectObject(&bm); I# U"DwM  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Uc<j{U ,  
 tdc.SelectObject(pOld); mcFJ__3MAV  
 BITMAP btm; _6k ej#o8  
 bm.GetBitmap(&btm); ,/ bv3pE  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; /a:sWmxMT  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Nn]|#lLP  
 BITMAPINFOHEADER bih; :]g>8sWL  
 bih.biBitCount=btm.bmBitsPixel; 89 6oz>  
 bih.biClrImportant=0; Y~%9TC  
 bih.biClrUsed=0; sj& j\<(  
 bih.biCompression=0; P>s 3Rh3:  
 bih.biHeight=btm.bmHeight; >GV = %  
 bih.biPlanes=1; wW?/`>@  
 bih.biSize=sizeof(BITMAPINFOHEADER); "fTW2D74  
 bih.biSizeImage=size; OX!<{9o  
 bih.biWidth=btm.bmWidth; ]= nM|e  
 bih.biXPelsPerMeter=0; |}Wm,J  
 bih.biYPelsPerMeter=0; G&2`c\u{  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ] 3UlF'{  
 static int filecount=0; SZ'2/#R>  
 CString name; (_aM26s  
 name.Format("pict%04d.bmp",filecount++); 3+>;$  
 name=m_Path+name; 8M&q  
 BITMAPFILEHEADER bfh; z;#]xCV  
 bfh.bfReserved1=bfh.bfReserved2=0; Zj]jE%AT  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 5U!yc7eBI/  
 bfh.bfSize=54+size; WY)*3?  
 bfh.bfOffBits=54; Pv3rDQ/Yt|  
 CFile bf; zs<2Ozv  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ luj UEHzp  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ;Or]x?-  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); [zv@}@$  
  bf.WriteHuge(lpData,size); Sgq" 3(+%,  
  bf.Close(); M&J$9X  
  nCount++; 6)[gF 1  
 } {vox x&UX  
 GlobalFreePtr(lpData); ='Fh^]*5  
 if(nCount==1) Apbgm[m|{  
  m_Number.Format("%d picture captured.",nCount); , ePl>m:Z  
 else q"$C)o  
  m_Number.Format("%d pictures captured.",nCount); J?_-Dg(=  
  UpdateData(FALSE); 3e ?J#;  
} 6~tj"34_  
fx*Q,}t  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) M~P h/  
{ $VnPs!a  
 if(pMsg -> message == WM_KEYDOWN) g[ O6WZ!F_  
 { ]:}x 4O#  
  if(pMsg -> wParam == VK_ESCAPE) pz ~REsx  
   return TRUE; bBgyLyg  
  if(pMsg -> wParam == VK_RETURN) C8AR ^F W  
   return TRUE; k~IRds@G  
 } +Y"HbNz  
 return CDialog::PreTranslateMessage(pMsg); Xz\X 8I  
} +6Ye'IOG  
{+jO/ZQu5  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^a?g~G  
{ fR#W#n#m  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Wiere0 2*  
  SaveBmp(); 9T%b#~?3P  
  return FALSE; EnP>  
} >9,:i)m_  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `i)Pf WdBN  
 CMenu pop; yM# %UeZ\  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Ib2n Bg>j  
 CMenu*pMenu=pop.GetSubMenu(0); Sv t%*j  
 pMenu->SetDefaultItem(ID_EXITICON); vY);7  
 CPoint pt; z yrjb 8  
 GetCursorPos(&pt); cQrXrij;!  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this);  I|. <  
 if(id==ID_EXITICON) q+{yv  
  DeleteIcon(); dZuPR  
 else if(id==ID_EXIT) 21 z@-&Oq  
  OnCancel(); 8f>v[SQ"  
 return FALSE; DqA$%b yyE  
} 'tJxADK  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); o]@'R<F(u  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) cK\'D  
 AddIcon(); 9e;8"rJ?C  
 return res; +Ou<-EQV  
}  TUq ,  
;jh.\a_\  
void CCaptureDlg::AddIcon() bKk7w#y  
{ z?WkHQ9  
 NOTIFYICONDATA data; BFZ\\rN`  
 data.cbSize=sizeof(NOTIFYICONDATA); \?[m%$A  
 CString tip; 6\USeZh  
 tip.LoadString(IDS_ICONTIP); %lGT |XrY  
 data.hIcon=GetIcon(0); pER[^LH_)  
 data.hWnd=GetSafeHwnd(); V$bq|r  
 strcpy(data.szTip,tip); /$^SiE+N  
 data.uCallbackMessage=IDM_SHELL; 5MK.>3fE  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; IwR=@Ne8  
 data.uID=98; dQ Lo,S8(  
 Shell_NotifyIcon(NIM_ADD,&data); \_MWZRMc5  
 ShowWindow(SW_HIDE); s){R/2O3F  
 bTray=TRUE; @ 1FWBH~  
} MbeK{8~E%l  
FpZ5@  
void CCaptureDlg::DeleteIcon() DTl&V|h$  
{ /4$ c-k  
 NOTIFYICONDATA data; Iv/h1j> H  
 data.cbSize=sizeof(NOTIFYICONDATA); e#@u&+K/f  
 data.hWnd=GetSafeHwnd(); G%U!$\j:qd  
 data.uID=98; )h1 `?q:5  
 Shell_NotifyIcon(NIM_DELETE,&data); G Q}Rxu]  
 ShowWindow(SW_SHOW); !, {-q)'D  
 SetForegroundWindow(); l"%WXi"X  
 ShowWindow(SW_SHOWNORMAL); 0aGAF ]  
 bTray=FALSE; Mo\nY5  
} -Fc 9mv(H  
g_)i)V  
void CCaptureDlg::OnChange() X/H2c"!t  
{ orhze Oi\  
 RegisterHotkey(); 0OBwe6*  
} 0G3T.4I  
M1I4Ot  
BOOL CCaptureDlg::RegisterHotkey() LG'1^W{a  
{ Tj=@5lj0  
 UpdateData(); ZVz*1]}  
 UCHAR mask=0; xLw[ aYy4  
 UCHAR key=0; #-/_J?  
 if(m_bControl) y2Vc[o(NP  
  mask|=4; }3R:7N`,|  
 if(m_bAlt) Ca0t}`<S  
  mask|=2; wD SSgk  
 if(m_bShift) '8b=4mrbH  
  mask|=1; C3b<Wa])  
  key=Key_Table[m_Key.GetCurSel()]; 1wW4bg 5  
 if(bRegistered){ mWuhXY^Q  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); E#n: d9WA:  
  bRegistered=FALSE; kS_3 7-;  
 } n yNHjn |W  
 cMask=mask; vr$z6m ^  
 cKey=key; \p\rPf Y{>  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); &sGLm~m#  
 return bRegistered; J=ot& %  
} EiWd =jDm  
r8!M8Sc  
  四、小结 )`zfDio-1V  
Y 4*?QBYA  
  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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