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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: dW%;Z  
  /~+j[o B  
  一、实现方法 D.YT u$T  
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  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: W . dm1  
)gG_K$08?  
#pragma data_seg("shareddata") Lw6}b B`}  
HHOOK hHook =NULL; //钩子句柄 wx^1lC2  
UINT nHookCount =0; //挂接的程序数目 }q)dXFL=I#  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Sj;:*jk!h  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 {qFAX<{D  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey zLjQ,Lp.I  
static int KeyCount =0; .c@,$z2M  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 mSp;(oQ  
#pragma data_seg() lmx'w  
Px`z$~*B:  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 Gu%}B@4^  
m</nOf+C  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 51puR8AG>  
- P'c0I9z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR { pu .l4nk  
cKey,UCHAR cMask) b$}@0  
{ 2w:cdAv$  
 BOOL bAdded=FALSE; $B@K  
 for(int index=0;index<MAX_KEY;index++){ $,jynRk7q  
  if(hCallWnd[index]==0){ SA.,Q~_T7  
   hCallWnd[index]=hWnd; xilA`uw`1  
   HotKey[index]=cKey; =mh)b]].4\  
   HotKeyMask[index]=cMask; w]Ci%W(  
   bAdded=TRUE; ] dHV^!  
   KeyCount++; ea!Znld]  
   break; \E,Fe:/g  
  } ,8@U-7f,  
 } 5OX5\#Ux  
 return bAdded; ?)XPY<  
} pAd SOR2  
//删除热键 xkkW?[&  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) G 4 C 7  
{ N,u~ZEI  
 BOOL bRemoved=FALSE; [X=Ot#?u ~  
 for(int index=0;index<MAX_KEY;index++){ H3jb{S b  
  if(hCallWnd[index]==hWnd){ \:91BQP c  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ QP4`r#,  
    hCallWnd[index]=NULL; f*ZIBTb 9  
    HotKey[index]=0; O$ ;:5zT  
    HotKeyMask[index]=0; m_r_4BP  
    bRemoved=TRUE; vq*)2.  
    KeyCount--; ]0)=0pc]E  
    break; HtGGcO'bqg  
   } +#R<emW  
  } 6"U)d7^  
 } ejC== Fkc  
 return bRemoved; [lX3":)  
} cdfvc0  
gDjs:]/YR  
9% AL f 9  
  DLL中的钩子函数如下: ^ql+l~  
b<mxf\b  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8k`rj;  
{ B0}f,J\  
 BOOL bProcessed=FALSE; e6WKZ~ v o  
 if(HC_ACTION==nCode) @AU<'?k  
 { ? $LKn2C  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 2u|} gZts  
   switch(wParam) e(m#elX  
   {  -l` 1j6  
    case VK_MENU: 1f^4J~{  
     MaskBits&=~ALTBIT; ?H_'L4Wv  
     break; tJ,x>s?Y  
    case VK_CONTROL: -w:F8k ~  
     MaskBits&=~CTRLBIT; -O-qEQd  
     break; O[[#\BL  
    case VK_SHIFT: PME ?{%&  
     MaskBits&=~SHIFTBIT; NuqWezJm&  
     break; ^N5BJ'[F:  
    default: //judge the key and send message ) b vZ~t+^  
     break; 9(( QSX  
   } 9V=bV=4:  
   for(int index=0;index<MAX_KEY;index++){ #c ndq[H  
    if(hCallWnd[index]==NULL) U ExK|t  
     continue; =@d IM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &[hq !v  
    { 1&@s2ee4   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); {D jz']  
     bProcessed=TRUE; eSgCS*}0$z  
    } (&G4@Vd  
   } {^xp?zpV  
  } &T8prE?  
  else if((lParam&0xc000ffff)==1){ //有键按下 D$RQD{*  
   switch(wParam) |? !Ew# w  
   { #Pz},!7  
    case VK_MENU: uwl;(zwh_  
     MaskBits|=ALTBIT; Et=N`k _gO  
     break; E(e'qL  
    case VK_CONTROL: qdB@P  
     MaskBits|=CTRLBIT; 8S>T1st  
     break; ?[\(i)]  
    case VK_SHIFT: %jK-}0Tu  
     MaskBits|=SHIFTBIT; s wdW70  
     break; tIgKnKr^)  
    default: //judge the key and send message J@y1L]:  
     break; lbv9 kk[  
   } T3o}%wGW  
   for(int index=0;index<MAX_KEY;index++){ @L8('8~d  
    if(hCallWnd[index]==NULL) ^3Ni  
     continue; VN[h0+n4Th  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *sqq]uD  
    {  ? {Lp  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &WIiw$@  
     bProcessed=TRUE; `?Yh`P0  
    } > ln%3 =  
   } 5uK:f\y)l  
  } (63_  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 M`ETH8Su=  
   for(int index=0;index<MAX_KEY;index++){ j(!M  
    if(hCallWnd[index]==NULL) L{|V13?  
     continue; wj/\ !V!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) cjU*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); m<wng2`NTv  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 s% "MaDz  
   } :luVsQ  
  } pq6}q($Rk  
 } ?9_<LE q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); q28i9$Yqj\  
} c~(+#a  
BF2,E<^A  
  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:  KAmv7  
^zHBDRsb2F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); wAxXK94#3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); zR/d:P?  
V?v,q'? $  
  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#6|[i  
(bi}?V*  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *ta ``q  
{ "P=OpFV  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ja}_u}:  
 { l;: L0(('  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Z9s tB>?  
  SaveBmp(); U7.3`qd"  
  return FALSE; <Brq7:n|  
 } _niXl&C  
 …… //其它处理及默认处理 ]S4kWq{Y  
} V2cLwQ'0  
^!-*xH.dK  
c4oQ4  
  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。 7wsn8_n9  
'<~l% q  
  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。 -Zd!0HNW1  
{wRsV=*  
  二、编程步骤 quHq?oXV,  
wQ qI@  
  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"; Y  9]  
0'`>20Y  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; mL`,v WL/`  
Z9mY*}:U~  
  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; f8kPbpV,  
_Iy0-=G  
  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; yTwv2l;U  
 XeDiiI  
  5、 添加代码,编译运行程序。 a:Js i=  
C1^=se  
三、程序代码 *Hy-D</w%  
+0\BI<aG  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL "  m<]B  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) "S.5_@?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 2Jl6Xc8  
#if _MSC_VER > 1000 c1M/:*?%  
#pragma once 5mUHk]W  
#endif // _MSC_VER > 1000 yB\}e'J^  
#ifndef __AFXWIN_H__ ^{nf0)56c  
#error include 'stdafx.h' before including this file for PCH w~hO)1c],:  
#endif JsI` #  
#include "resource.h" // main symbols -jdS8n4  
class CHookApp : public CWinApp 4Tgy2[D?q  
{ r$}M,! J  
 public: U|. kAI*  
  CHookApp(); A#$oY{"2Y  
  // Overrides ec+&K?T  
  // ClassWizard generated virtual function overrides  u)PB@  
  //{{AFX_VIRTUAL(CHookApp) TZ{';oU  
 public: NpqMdd   
  virtual BOOL InitInstance(); \,)('tUE  
  virtual int ExitInstance(); t?f2*N :  
  //}}AFX_VIRTUAL @S\!wjl]C  
  //{{AFX_MSG(CHookApp) OjTb2[Q  
  // NOTE - the ClassWizard will add and remove member functions here. p;cNmMm  
  // DO NOT EDIT what you see in these blocks of generated code ! <VI.A" Qk~  
  //}}AFX_MSG =V~p QbZ  
  DECLARE_MESSAGE_MAP() T#kPn#|  
}; low 0@+Q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); N,fEta6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); QG {KEj2V  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); F,+nj?i!  
BOOL InitHotkey(); %^tKt  
BOOL UnInit(); UngDXD )  
#endif KGb:NQ=O6i  
&{E1w<uv  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. y(/"DUx  
#include "stdafx.h" 0'q&7 MV  
#include "hook.h" t4(Z@X$  
#include <windowsx.h> C$?gt-tJ'  
#ifdef _DEBUG ScOiOz:Ha  
#define new DEBUG_NEW BUB$k7{z  
#undef THIS_FILE shlMJa?  
static char THIS_FILE[] = __FILE__; >dO1)  
#endif A)6xEeyR  
#define MAX_KEY 100 ,9;RP/"7  
#define CTRLBIT 0x04 yu3: Hv}  
#define ALTBIT 0x02 VRden>vKN  
#define SHIFTBIT 0x01 c"HB7  
#pragma data_seg("shareddata") }#%3y&7M7  
HHOOK hHook =NULL; F[am2[/<A  
UINT nHookCount =0; #o`y<1rN  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey [ye!3h&]  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT CVUA7eG+  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey y2Eq-Ie  
static int KeyCount =0; k*XI/k5Vc  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift { 3,_i66  
#pragma data_seg() y,&'nk}  
HINSTANCE hins; -DAkVFsN  
void VerifyWindow(); >Sc)?[H  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) RHO | g0  
//{{AFX_MSG_MAP(CHookApp) E3..$x-/  
// NOTE - the ClassWizard will add and remove mapping macros here. FTu6%~M/  
// DO NOT EDIT what you see in these blocks of generated code! YkWv*l  
//}}AFX_MSG_MAP s"OP[YEke/  
END_MESSAGE_MAP() /wAx#[c[  
 SXqWq  
CHookApp::CHookApp() aMv?D(Meb  
{ CG#lpAs  
 // TODO: add construction code here, 8M6 Xd]{%  
 // Place all significant initialization in InitInstance #3VOC#.  
} sF. oZ>  
xE>jlr?  
CHookApp theApp; h2S!<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %<dvdIB  
{ b@v_db]|t.  
 BOOL bProcessed=FALSE; Tumv0=q4wd  
 if(HC_ACTION==nCode) /$[9-G?  
 { DUrfC[jpv  
  if((lParam&0xc0000000)==0xc0000000){// Key up @n|Mr/PAj  
   switch(wParam) 5& 2([  
   { bwR$9 10b  
    case VK_MENU: 7!qO*r  
     MaskBits&=~ALTBIT; C4[)yJ  
     break; H|\@[:A+  
    case VK_CONTROL: lwSZ pS  
     MaskBits&=~CTRLBIT; SAVA6 64  
     break; b#%$y  
    case VK_SHIFT: iY,Ffu E  
     MaskBits&=~SHIFTBIT; hr@kU x  
     break; ?2(5 2?cJ  
    default: //judge the key and send message \k4em{K  
     break; '^|u\$&U  
   } zH5pe  
   for(int index=0;index<MAX_KEY;index++){ zi^?9n),  
    if(hCallWnd[index]==NULL) G+~f  
     continue; WrHY'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Iwx~kvz\_(  
    { eIDrN%3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); yR3pK 0Y(?  
     bProcessed=TRUE; Qx")D?u  
    } H8x66}  
   } " "@kBY1C  
  } Y&uwi:_g  
  else if((lParam&0xc000ffff)==1){ //Key down {Mpx33  
   switch(wParam) Z g.La<#  
   { | LX Vf  
    case VK_MENU: B"Ma<"HU  
     MaskBits|=ALTBIT; a.z)m} +  
     break; 5La' I7q  
    case VK_CONTROL: rRvZG&k  
     MaskBits|=CTRLBIT; :Ahw{z`H#  
     break;  ID]E3K  
    case VK_SHIFT: ,W|cyQ  
     MaskBits|=SHIFTBIT; JKz]fgOd$  
     break; |s'5 ~+  
    default: //judge the key and send message qKD Nw8>  
     break; :V0sKg|sS  
   } P:>]a$Is  
   for(int index=0;index<MAX_KEY;index++) yBRYEqS+  
   { `aDVN_h{6  
    if(hCallWnd[index]==NULL) D0}r4eA  
     continue; 5c\dm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ny"z<N&}/  
    { n5 2Q-6H  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); OWc~=Cr  
     bProcessed=TRUE; +O)Y7k{?C5  
    } 74=zLDDS  
   } Mi} .  
  } ] T<#bNK\1  
  if(!bProcessed){ W1&"dT@  
   for(int index=0;index<MAX_KEY;index++){ ||))gI`3a  
    if(hCallWnd[index]==NULL) BS=~G+/:|  
     continue; j}O7fLRu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {TZV^gT4  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); sp&gw XPG  
   } DLN zH  
  } (<}BlL   
 } )x<BeD  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^ib =fLu  
} uD?Rs`  
 R;zf x/  
BOOL InitHotkey() IgN^~ag`  
{ &O5O@3:7]  
 if(hHook!=NULL){ J$U_/b.mk  
  nHookCount++; g2?yT ?  
  return TRUE; w*]FJ-b<.j  
 } NwVhJdo  
 else '6cXCO-_P  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); I+,CiJ|4  
  if(hHook!=NULL) pL . 0_  
   nHookCount++; &smZ;yb|'h  
  return (hHook!=NULL); =Qf{  
} /Pxny3  
BOOL UnInit() 4Y{;%;-i  
{ dZox;_b  
 if(nHookCount>1){ kA> e*6  
  nHookCount--; .Q^V,[on1T  
  return TRUE; gquvVj1oT  
 } oQ A,57B  
 BOOL unhooked = UnhookWindowsHookEx(hHook); & WeN{  
 if(unhooked==TRUE){ tH~>uOZW  
  nHookCount=0; K)  Ums-b  
  hHook=NULL; \8g= Ix  
 } Ylyk/  
 return unhooked; 0gG r/78   
} Y^nm{;G+  
NTEN  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) U^eos;:s8  
{ NwxDxIIH/)  
 BOOL bAdded=FALSE; =kf"%vFV  
 for(int index=0;index<MAX_KEY;index++){ _u'y7-  
  if(hCallWnd[index]==0){ G{{M' 1  
   hCallWnd[index]=hWnd; K&,";9c  
   HotKey[index]=cKey; G8 q<)  
   HotKeyMask[index]=cMask; >FKwFwT4D  
   bAdded=TRUE; wFMw&=j  
   KeyCount++; &8Z .m,s]  
   break; &po!X )  
  } ]1pB7XL  
 } a6Joa&`dv  
 return bAdded; |fW_9={1kQ  
} *H i}FI  
!Qf*d;wxn(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) C,A/29R,s  
{ T:Ovh.$  
 BOOL bRemoved=FALSE; ##} 7cFX  
 for(int index=0;index<MAX_KEY;index++){ $7ix(WL<%  
  if(hCallWnd[index]==hWnd){ bdY:-8!3  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,<'>j a C  
    hCallWnd[index]=NULL; 6B%  h  
    HotKey[index]=0; >x3lA0m  
    HotKeyMask[index]=0; rlA/eQrS  
    bRemoved=TRUE; mU~&oU  
    KeyCount--; Nd+1r|e'  
    break; 0~K&P#iR  
   } =Xg/[J%  
  } 8 ]exsn Z  
 } PEm2w#X%L  
 return bRemoved; <hj2'd U  
} zsd1n`r  
#9Jr?K43  
void VerifyWindow() qv}ECQ  
{ ggiy{CdR  
 for(int i=0;i<MAX_KEY;i++){ _ziSH 3(  
  if(hCallWnd!=NULL){ f$6N  
   if(!IsWindow(hCallWnd)){ vy7/  
    hCallWnd=NULL; l)dE7$H  
    HotKey=0; G}^=(,jl  
    HotKeyMask=0; 1+WVh7gF  
    KeyCount--; Rw%?@X3m]  
   } ^=n7E  
  } 9Li*L&B)  
 } HKJBR)T  
} KYtCN+vsG  
'vZIAnB8  
BOOL CHookApp::InitInstance() <+-n lK4  
{ 5h`LWA B  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); DKu$u ]Z  
 hins=AfxGetInstanceHandle(); @ci..::5  
 InitHotkey(); bT&{8a  
 return CWinApp::InitInstance(); l>b'b e9  
} 8cG`We8l&  
"mQcc }8  
int CHookApp::ExitInstance() 1(dKb  
{ kx?Yin8K  
 VerifyWindow(); X,_K )f  
 UnInit(); u*;H$&  
 return CWinApp::ExitInstance(); } O $]xB  
} !?0C(VL(:  
8K-P]]  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file GRbbU#/=G  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) E V)H>kM  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ gqy>;A:kO  
#if _MSC_VER > 1000 H"8B4~*7H  
#pragma once 3&7? eO7*  
#endif // _MSC_VER > 1000 wCg7JW#  
2#R$-* ;#  
class CCaptureDlg : public CDialog < $e#o H  
{ |cY,@X,X6  
 // Construction (w)%2vZ^  
 public: ,++HiYOG}e  
  BOOL bTray; 5rB>)p05[  
  BOOL bRegistered; n|&=6hiI  
  BOOL RegisterHotkey(); <_<zrXc]  
  UCHAR cKey; '(3 QyCD  
  UCHAR cMask; O5-GrR^yt  
  void DeleteIcon(); *)-@'{]uB  
  void AddIcon(); g/!MEOVx  
  UINT nCount; UtTlJb{-j  
  void SaveBmp(); $Y_S`#c@i  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor >_ZEQC  
  // Dialog Data $M,<=.oT  
  //{{AFX_DATA(CCaptureDlg) c,.@Cc2  
  enum { IDD = IDD_CAPTURE_DIALOG }; uK$ Xqo%L  
  CComboBox m_Key; F+(S-Qk1  
  BOOL m_bControl; fEXFnQ#  
  BOOL m_bAlt; S,6/X.QBv  
  BOOL m_bShift; v{t pRL0  
  CString m_Path;  yP+<kv4  
  CString m_Number; ;!S5P(  
  //}}AFX_DATA 1bQO:n):~  
  // ClassWizard generated virtual function overrides &lSNI5l  
  //{{AFX_VIRTUAL(CCaptureDlg) ydYsmTr  
 public: 0H>gMXWE]  
  virtual BOOL PreTranslateMessage(MSG* pMsg); GJcxqgk$  
 protected: ,zM@)Q ;9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support oio{@#DX`  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); V sl,u  
  //}}AFX_VIRTUAL SgewAng?@o  
  // Implementation L}rZ1wV6  
 protected: SkmTW@v  
  HICON m_hIcon; iZy>V$Aq  
  // Generated message map functions  d=^QK{8  
  //{{AFX_MSG(CCaptureDlg) U[x$QG6m!  
  virtual BOOL OnInitDialog(); Y,0Z&6 <  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 56<UxIa~  
  afx_msg void OnPaint(); |Qcz5M90e  
  afx_msg HCURSOR OnQueryDragIcon(); D tZ?sG  
  virtual void OnCancel(); 2sIt~ Gn  
  afx_msg void OnAbout(); &Ril[siw  
  afx_msg void OnBrowse(); r_$*euh@  
  afx_msg void OnChange(); W%>T{}4  
 //}}AFX_MSG N Nk  
 DECLARE_MESSAGE_MAP() qA!p7"m|  
}; \;~Nj#  
#endif zO"De~[9  
P'tXG  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file v[ML=pL  
#include "stdafx.h" v; i4ZSV^A  
#include "Capture.h" !xck ~EAS  
#include "CaptureDlg.h" Xrb7.Y0d  
#include <windowsx.h> p2 1|  
#pragma comment(lib,"hook.lib") K9Mz4K_  
#ifdef _DEBUG o=7,U/{D!  
#define new DEBUG_NEW hJ`Gu7  
#undef THIS_FILE W/BPf{U  
static char THIS_FILE[] = __FILE__; &j1-Ouy  
#endif $L0sBW&  
#define IDM_SHELL WM_USER+1 YdO*5Gb6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E& 6I`8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !Ea >tQ|  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; li3,6{S#  
class CAboutDlg : public CDialog 1xS+r)_n@  
{ o 7kg.w|  
 public: j8Z;}Ps  
  CAboutDlg(); xkRMg2X.>9  
  // Dialog Data 0ex.~S_Oj4  
  //{{AFX_DATA(CAboutDlg) 1!(lpp  
  enum { IDD = IDD_ABOUTBOX }; HBe*wkPd  
  //}}AFX_DATA H@@ 4n%MK  
  // ClassWizard generated virtual function overrides (CIcM3|9C  
  //{{AFX_VIRTUAL(CAboutDlg) ^wBlQmW7J  
 protected: oB5\^V$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }ZVond$y4  
  //}}AFX_VIRTUAL bC:sd2s  
  // Implementation Ga02Zk  
 protected: Hj r'C?[  
  //{{AFX_MSG(CAboutDlg) {Cm!5QYy  
  //}}AFX_MSG d*s*AV  
  DECLARE_MESSAGE_MAP() m0;j1-t  
}; `.pEI q^  
 4 Pc-A  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) GalSqtbmDt  
{ C5ILVQ  
 //{{AFX_DATA_INIT(CAboutDlg) bdstxjJ`  
 //}}AFX_DATA_INIT I[|Y 2i  
} D%o(HS\E  
V WZpEi  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) c>D~MCNxg  
{ .q MxShUU  
 CDialog::DoDataExchange(pDX); neM)(` gp  
 //{{AFX_DATA_MAP(CAboutDlg) y%%VJ}'X!  
 //}}AFX_DATA_MAP `Z,WKus  
} |MGT8C&^!  
5B:"$vC{=  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) TfZM0Wz  
 //{{AFX_MSG_MAP(CAboutDlg) TM6wjHFm  
 // No message handlers 6w &<j&V  
 //}}AFX_MSG_MAP LAk .f  
END_MESSAGE_MAP() </_QldL_  
]>)shH=Yx  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) V.`hk^V,  
: CDialog(CCaptureDlg::IDD, pParent) 5fk A?Ecqq  
{ xL_QTj  
 //{{AFX_DATA_INIT(CCaptureDlg) >4wigc  
  m_bControl = FALSE; E8kD#tL  
  m_bAlt = FALSE; 0(+<uo~6p1  
  m_bShift = FALSE; #\X)|p2  
  m_Path = _T("c:\\"); \m)s"Sh.  
  m_Number = _T("0 picture captured."); d>F7i~W  
  nCount=0; I(VqtC:K.  
  bRegistered=FALSE; PH%t#a!j3/  
  bTray=FALSE; {'zS8  
 //}}AFX_DATA_INIT h *;c"/7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 sT1OAK\^  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ]g$ky.;  
} E7h@Y~bNhW  
;C*2Djb*n  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ^n~Kr1}nj  
{ BDfMFH[1  
 CDialog::DoDataExchange(pDX); .a2R2~35  
 //{{AFX_DATA_MAP(CCaptureDlg) 3"Oipt+  
  DDX_Control(pDX, IDC_KEY, m_Key); AoGpM,W]5  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); wE1GyN  
  DDX_Check(pDX, IDC_ALT, m_bAlt); KF *F  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); U*K4qJ6U  
  DDX_Text(pDX, IDC_PATH, m_Path); 5u9lKno  
  DDX_Text(pDX, IDC_NUMBER, m_Number); *.w6 =}  
 //}}AFX_DATA_MAP l5^Q  
} hO> q|+mC  
xp:I(  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) C\"C12n{  
//{{AFX_MSG_MAP(CCaptureDlg) DmgDhNXKq  
 ON_WM_SYSCOMMAND() tlO=>  
 ON_WM_PAINT() )M7yj O!  
 ON_WM_QUERYDRAGICON() 4V[(RXc/  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) W="pu5q$5  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) a{7*um  
 ON_BN_CLICKED(ID_CHANGE, OnChange) u=@zYA(  
//}}AFX_MSG_MAP x!S}Y"  
END_MESSAGE_MAP() ]+pE1-p\  
L8.A|  
BOOL CCaptureDlg::OnInitDialog() F ',1R"/}  
{ !4^Lv{1QZ  
 CDialog::OnInitDialog(); lu>G=uCJ  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 7C2Xy>d~  
 ASSERT(IDM_ABOUTBOX < 0xF000); &VU^d3gv~  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 2@_3V_  
 if (pSysMenu != NULL) a>#$&&oQ0  
 { Ro$*bN6p  
  CString strAboutMenu; 4avkyFj!h  
  strAboutMenu.LoadString(IDS_ABOUTBOX); (`Y;U(n  
  if (!strAboutMenu.IsEmpty())  !N\_D  
  { :1t&>x=T  
   pSysMenu->AppendMenu(MF_SEPARATOR); (F;*@Z*R  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); h3>u[cX%  
  }  nmL|v  
 } }n^}%GB  
 SetIcon(m_hIcon, TRUE); // Set big icon WB (?6"  
 SetIcon(m_hIcon, FALSE); // Set small icon x=K'Jj  
 m_Key.SetCurSel(0); Vd.XZ*}r*  
 RegisterHotkey(); Ia9!ucN7DA  
 CMenu* pMenu=GetSystemMenu(FALSE); -{?xl*D  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ~PpU'[  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); hn6'$P  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); N-}OmcO]e  
 return TRUE; // return TRUE unless you set the focus to a control e=jtF"&  
} [D?xd/G  
8j]QnH0&  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #"C* dNAB  
{ tg%<@U`7=  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) TgRG6?#^l  
 { \ X6y".|-  
  CAboutDlg dlgAbout; TFbF^Kd#:d  
  dlgAbout.DoModal(); X2~KNw  
 } ][OkydE  
 else v+C D{Tc  
 { BlqfST#6  
  CDialog::OnSysCommand(nID, lParam); P4MP`A  
 } Xn!=/<TIVz  
} >Zf*u;/dW$  
b?9'-hK<  
void CCaptureDlg::OnPaint() )B @&q.2B=  
{ ZkMHy1  
 if (IsIconic()) Jju?v2y`  
 { 1mEW]z  
  CPaintDC dc(this); // device context for painting ]?jmRk^ .  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); !C.{nOfyv  
  // Center icon in client rectangle ov>`MCS,v  
  int cxIcon = GetSystemMetrics(SM_CXICON); I= z+`o8  
  int cyIcon = GetSystemMetrics(SM_CYICON); 2NL|_W/  
  CRect rect; `lO/I+8  
  GetClientRect(&rect); lnxA/[`a  
  int x = (rect.Width() - cxIcon + 1) / 2; #)6 bfyi-  
  int y = (rect.Height() - cyIcon + 1) / 2; @[rlwwG,  
  // Draw the icon 38JU-aq  
  dc.DrawIcon(x, y, m_hIcon); +A_jm!tJS(  
 } hn/SS  
 else HOPsp  
 { aUBu"P$J  
  CDialog::OnPaint(); NL ceBok  
 } 5_L43-  
} 4MgG]  
Rk{2ZUeg  
HCURSOR CCaptureDlg::OnQueryDragIcon() AWmJm)   
{ KEr?&e  
 return (HCURSOR) m_hIcon; l)0yv2[h  
} h"N#/zQ  
VqB9^qJ]!  
void CCaptureDlg::OnCancel() *\wf(o>Q  
{ Qc:Sf46O  
 if(bTray) ]0p*EB=C*  
  DeleteIcon(); A'? W5~F  
  CDialog::OnCancel(); DZ;2aH  
} gem+$TFq  
[WunA,IuR  
void CCaptureDlg::OnAbout() iw EHEi%  
{ z:W1(/W~  
 CAboutDlg dlg; O`(it %Ho!  
 dlg.DoModal(); t!vlZNc  
} $L$GI~w/  
b(gcnSzM2  
void CCaptureDlg::OnBrowse() 6NqLo^ "g  
{ F30jr6F\  
 CString str; &@xeWB  
 BROWSEINFO bi; ^-7{{/  
 char name[MAX_PATH]; i0~L[v9l<  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); d "vd_}P~  
 bi.hwndOwner=GetSafeHwnd(); `<l|XPv  
 bi.pszDisplayName=name; /-)|dP  
 bi.lpszTitle="Select folder"; ?rH=<#@  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ud.Bzg:/  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); _`Sz}Yk  
 if(idl==NULL) 7dU7cc  
  return; C!" .[3  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); &U/~*{  
 str.ReleaseBuffer(); '}wYSG-  
 m_Path=str; =8fZG t  
 if(str.GetAt(str.GetLength()-1)!='\\') *:A )j?(  
  m_Path+="\\"; l+V5dZ8W  
 UpdateData(FALSE); gBG.3\[  
} 9wFQ<r  
L:F:ZOM6`  
void CCaptureDlg::SaveBmp() p^``hP:J  
{ 6Gs,-Kb:  
 CDC dc; H{T)?J~  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 62LQUl]<  
 CBitmap bm;  0-+`{j  
 int Width=GetSystemMetrics(SM_CXSCREEN); 5OUe |mS  
 int Height=GetSystemMetrics(SM_CYSCREEN); |KC3^  
 bm.CreateCompatibleBitmap(&dc,Width,Height); BPd]L=,/  
 CDC tdc; @]h#T4z'  
 tdc.CreateCompatibleDC(&dc); ptuW}"F  
 CBitmap*pOld=tdc.SelectObject(&bm);  93(  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 4.dMNqU  
 tdc.SelectObject(pOld); Swua dN  
 BITMAP btm; jr:LLn#}  
 bm.GetBitmap(&btm); kB]|4CG{  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Z [5HI;  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Z{n7z$s*  
 BITMAPINFOHEADER bih; #UJ@P Dwil  
 bih.biBitCount=btm.bmBitsPixel; E%-&!%_>D@  
 bih.biClrImportant=0; Dx[t?-  
 bih.biClrUsed=0; (<.1o_Q-LU  
 bih.biCompression=0; 5y"yd6O]O5  
 bih.biHeight=btm.bmHeight; 3)g1e=\i$  
 bih.biPlanes=1; MOmp{@  
 bih.biSize=sizeof(BITMAPINFOHEADER); /HDX[R   
 bih.biSizeImage=size; T "G!H  
 bih.biWidth=btm.bmWidth; N]yk<55  
 bih.biXPelsPerMeter=0; R/O_*XY  
 bih.biYPelsPerMeter=0; 1 )j%]zd2  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); %9NGVC  
 static int filecount=0; l>&)_:\  
 CString name; J= |[G'  
 name.Format("pict%04d.bmp",filecount++); w-CuO4P  
 name=m_Path+name; a3lo;Cfp  
 BITMAPFILEHEADER bfh; xHr  
 bfh.bfReserved1=bfh.bfReserved2=0; 6U+#ADo  
 bfh.bfType=((WORD)('M'<< 8)|'B'); [bT@Y:X@`  
 bfh.bfSize=54+size; t8)Fkx#8}  
 bfh.bfOffBits=54; l2`8]Qr   
 CFile bf; j^!J: Bj  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ *,- YWx4  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Iwn@%?7  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ?I@3`?'  
  bf.WriteHuge(lpData,size); 7_Q86o  
  bf.Close(); nf G:4k,  
  nCount++; &&<^wtznO  
 } }5]s+m  
 GlobalFreePtr(lpData); w\2[dd  
 if(nCount==1) [X~X?By>  
  m_Number.Format("%d picture captured.",nCount); %mYIXsuH  
 else -=sxbs.aA  
  m_Number.Format("%d pictures captured.",nCount); RY~)MS _C  
  UpdateData(FALSE); pM7BdMp   
}  #b"IX`5  
n `Xz<Q!  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) BA>0 +  
{ e-K8K+7  
 if(pMsg -> message == WM_KEYDOWN) 8 [."%rzN  
 { +8Px` v1L  
  if(pMsg -> wParam == VK_ESCAPE) }mGD`5[`  
   return TRUE; 6b8Klrar!  
  if(pMsg -> wParam == VK_RETURN) $tKATL*  
   return TRUE; Y'HF^jv]R  
 } G_<[sMC8  
 return CDialog::PreTranslateMessage(pMsg); RQ'c~D)X  
} 7w$R-Y/E  
1c4%g-]7  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) D vKM>P%|  
{ <EUSl|6  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 7fE V/j  
  SaveBmp(); w +Z};C  
  return FALSE; bOdv]nQ1  
} ri;M7rg`.{  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ BT1'@qF  
 CMenu pop; 3.H-G~  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); dtBV0$  
 CMenu*pMenu=pop.GetSubMenu(0); !491 \W0ZH  
 pMenu->SetDefaultItem(ID_EXITICON); Iz8 ^? >X  
 CPoint pt; 7EO&:b]  
 GetCursorPos(&pt); \|t0~sRwh  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); }\{1`$*~  
 if(id==ID_EXITICON) cs M|VNE>  
  DeleteIcon(); 'nS3o.}  
 else if(id==ID_EXIT) %Eh%mMb^  
  OnCancel(); -8jqC6mQ  
 return FALSE; r97[!y1gt  
} ~ 7Nyi dV;  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); B3t>M) 9  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) NETC{:j  
 AddIcon(); TjK5UML  
 return res; 7qz-RF#s8  
} 9tEKA|8  
@b{u/:y  
void CCaptureDlg::AddIcon() 5; [|k$ v  
{ [\ YP8^..  
 NOTIFYICONDATA data; @<=#i  
 data.cbSize=sizeof(NOTIFYICONDATA); g0OS<,:  
 CString tip; =M#?*e  
 tip.LoadString(IDS_ICONTIP); <xjv7`G7  
 data.hIcon=GetIcon(0); 1@S6[&_  
 data.hWnd=GetSafeHwnd();  ?|J+dW  
 strcpy(data.szTip,tip); cgeS)C7  
 data.uCallbackMessage=IDM_SHELL; BQ:Kx_   
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ] *VF Ws  
 data.uID=98; R<HZC;x  
 Shell_NotifyIcon(NIM_ADD,&data); *9ub.:EUwV  
 ShowWindow(SW_HIDE); O9X:1>a@i  
 bTray=TRUE; 786_QV  
} 08?MS_  
HHTsHb{7  
void CCaptureDlg::DeleteIcon() ,HkhKbQ  
{ cgXF|'yI&l  
 NOTIFYICONDATA data; g,?\~8-c  
 data.cbSize=sizeof(NOTIFYICONDATA); dq 8+m(7k  
 data.hWnd=GetSafeHwnd(); [@.B4p  
 data.uID=98; AVpuMNd@  
 Shell_NotifyIcon(NIM_DELETE,&data); 8tZ} ;="F  
 ShowWindow(SW_SHOW); |3@=CE7G  
 SetForegroundWindow(); b>=7B6 Aw  
 ShowWindow(SW_SHOWNORMAL); &:auB:b  
 bTray=FALSE; F$ {4X /9n  
} 1o#vhk/ "+  
p":@>v?  
void CCaptureDlg::OnChange() 6UB6;-  
{ + U5U.f%  
 RegisterHotkey(); Y(z }[`2  
} `@\^m_!}  
u%aFb*  
BOOL CCaptureDlg::RegisterHotkey() @W)/\AZ3  
{  ~^7  
 UpdateData(); TolrEcI  
 UCHAR mask=0; Iv1c4"  
 UCHAR key=0; yM17H\=  
 if(m_bControl) rIPl6,w~  
  mask|=4; 4 m $sJ  
 if(m_bAlt) KL~AzLI  
  mask|=2; Gbx";Y8  
 if(m_bShift) jNqVdP]d\  
  mask|=1; 4(sttd_  
  key=Key_Table[m_Key.GetCurSel()]; #XL`S  
 if(bRegistered){  3se$,QmN  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); s<#N]mp'   
  bRegistered=FALSE; pg5&=  
 } UGf6i"F  
 cMask=mask; KT%{G8Y@M  
 cKey=key; UhA_1A'B  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); a'^0.1  
 return bRegistered; M)tv;!eQ  
} X=#It&m%s  
 L,%Z9  
  四、小结 /[L)tj7B  
F%y{% C7l  
  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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