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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: I(WND/&  
  \t&6$"n(B6  
  一、实现方法 I|[aa$G  
?yz}  
  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: NOmSLIgt7  
nuv$B >  
#pragma data_seg("shareddata") 28+ Sz>SP  
HHOOK hHook =NULL; //钩子句柄 y+iuA@WCv  
UINT nHookCount =0; //挂接的程序数目 0H.B>: pv  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 fs]Zw mA^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 &sA6o"h~  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ~pSD|WX  
static int KeyCount =0; &9] [ ~$  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 .J\U|r  
#pragma data_seg() M/sqOhg  
El&pu x2  
  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。 A[':O*iB  
&<i>)Ss  
  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: U7fE6&g  
g?o$:>c  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR >|I3h5\M  
cKey,UCHAR cMask) ;/{Q4X{  
{ 4_I,wG@  
 BOOL bAdded=FALSE; VF==F_l  
 for(int index=0;index<MAX_KEY;index++){ "Lpt@g[HF  
  if(hCallWnd[index]==0){ ZCJ8I  
   hCallWnd[index]=hWnd; IO_H%/v"jC  
   HotKey[index]=cKey; 7erao-  
   HotKeyMask[index]=cMask; .}y Lz  
   bAdded=TRUE; U14dQ=~b/  
   KeyCount++; Z*e7W O.  
   break; 1@qb.9wZ6  
  } +Vf|YLbhJ  
 } S(-=I!.G{  
 return bAdded; E 0pF; P5  
} CX'E+  
//删除热键 0Rk'sEX,  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 01q7n`o#zf  
{ 'Jl.fN  
 BOOL bRemoved=FALSE; s3kEux^  
 for(int index=0;index<MAX_KEY;index++){ gZ!(&u  
  if(hCallWnd[index]==hWnd){ .y2<2eW  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }>XSp)"{l  
    hCallWnd[index]=NULL; (&hX8  
    HotKey[index]=0; 7<:w-  
    HotKeyMask[index]=0; (1} Ndo^;w  
    bRemoved=TRUE; `y6l^ep  
    KeyCount--; m<f{7]fi5  
    break; d<b,LD^  
   } E:E &Wv?r  
  } yRi/YR#  
 } # nYGKZ  
 return bRemoved; /eMZTh*1P  
} qiF~I0_0  
jh0$:6 `C  
~D=@4(f8|  
  DLL中的钩子函数如下: dO//  
yEqmB4^-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) yaR;  
{ V= *J9~K  
 BOOL bProcessed=FALSE; -5 W0K}  
 if(HC_ACTION==nCode) kL|Y-(FPo%  
 { qRGb3l  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Qy/bzO  
   switch(wParam) c_a$g  
   {  +l/j6)O`(m  
    case VK_MENU: S'JeA>L  
     MaskBits&=~ALTBIT; KE&}*Nf[  
     break; qtH&]Suu,  
    case VK_CONTROL: pz IMj_  
     MaskBits&=~CTRLBIT; yl 8v&e{  
     break; 4F4u1r+  
    case VK_SHIFT: Y#Vy:x[  
     MaskBits&=~SHIFTBIT; G\p; bUF  
     break; rlIEch^wZ  
    default: //judge the key and send message t3>r f3v  
     break; 7h0'R k  
   } BD0-v`  
   for(int index=0;index<MAX_KEY;index++){ MHYf8HN  
    if(hCallWnd[index]==NULL) 2,;t%GB  
     continue; $B?7u@>,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D5m\u$~V  
    { VfcQibm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); lmcDA,7  
     bProcessed=TRUE; `k| nf9_  
    } `s_TY%&_}g  
   } QMxz@HGa|  
  } a*[\edcHU  
  else if((lParam&0xc000ffff)==1){ //有键按下 e d*AU,^@v  
   switch(wParam) X[~CLKH(  
   { g[jZ A[[  
    case VK_MENU: ggTjd"|)  
     MaskBits|=ALTBIT; ncdr/(`  
     break; .am*d|&+G  
    case VK_CONTROL: ~=mM/@HD  
     MaskBits|=CTRLBIT; feW9 >f;  
     break; E\S&} K,s  
    case VK_SHIFT: `j![  
     MaskBits|=SHIFTBIT; *a%PA(%6  
     break; \-0`%k"&  
    default: //judge the key and send message U}0/V c26  
     break; DS2$w9!  
   } "y0 A<-~  
   for(int index=0;index<MAX_KEY;index++){ 9.=#4OH/  
    if(hCallWnd[index]==NULL) 8W>l(w9M  
     continue; dSZ#,Ea"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) //@=Q!MW  
    { m6cW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [AzN&yACE  
     bProcessed=TRUE; fNJ;{&#  
    } %4Zy1{yKs_  
   } fdG.=7`  
  } 6I#DlAU@v  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 $IT9@}*{  
   for(int index=0;index<MAX_KEY;index++){ wcf_5T  
    if(hCallWnd[index]==NULL) ACYn87tq  
     continue; ;alFK*K6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) bVHi3=0{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |pR$' HO  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 [;AcV73  
   } }AqD0Qd2Hj  
  } Y7)@(7G)\  
 } 2oG|l!C  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); " G6j UTt  
} 8w[EyVHA  
@EZONKT  
  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: CM1a<bV<  
`=DCX%Vw  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8|NJ(D-$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "%t`I)  
r_E)HL/A  
  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: U.'@S8  
n;`L5  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5z ^UQ q  
{ 9%14k  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ~{G: ,|`  
 { c.Z4f 7  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 S\;.nAR  
  SaveBmp(); -$t,}3  
  return FALSE; am+mXb  
 } WUS9zK  
 …… //其它处理及默认处理 C}'="g^=sl  
} ?(8%SPRk  
y?#J`o- O  
; S ` -9}6  
  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。 g+)\ /n|  
yKEFne8^  
  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。 ,D2_Z]  
gCr|e}w-  
  二、编程步骤 PZRn6Tc  
.{ a2z*o  
  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"; O:tX0<6  
/.YAFH|i)"  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; oImgj4C2L  
AWXpA1(  
  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; ?lN8~Ze  
M2Fj)w2   
  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; M.N~fSJ   
S} Cp&}G{P  
  5、 添加代码,编译运行程序。 R 0HVLQI  
.]s( c!{y  
三、程序代码 9XqAjez\  
\Fg6b6  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL #x@lZ!Y  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) etMh=/NFV  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ,nB3c5X)|  
#if _MSC_VER > 1000 IKzRM|/  
#pragma once 8{SU?MHQLE  
#endif // _MSC_VER > 1000 G? gXK W  
#ifndef __AFXWIN_H__ D *I;|.=u  
#error include 'stdafx.h' before including this file for PCH 35 5Sd;*  
#endif D>b5Uwt  
#include "resource.h" // main symbols <-B"|u  
class CHookApp : public CWinApp ]Bd3d%  
{ @@3,+7%1  
 public: w1@b5-  
  CHookApp(); s~X*U&}5  
  // Overrides O& %"F8B  
  // ClassWizard generated virtual function overrides pNE\@U|4E  
  //{{AFX_VIRTUAL(CHookApp) @ PoFxv  
 public: "E)++\JL  
  virtual BOOL InitInstance(); AYA&&b  
  virtual int ExitInstance(); W#jZRviyq!  
  //}}AFX_VIRTUAL tWSvxGCzn%  
  //{{AFX_MSG(CHookApp) R=9~*9  
  // NOTE - the ClassWizard will add and remove member functions here. u@_!mjXQ  
  // DO NOT EDIT what you see in these blocks of generated code ! t_>bTcsU  
  //}}AFX_MSG dEd]U49u  
  DECLARE_MESSAGE_MAP() B5,QJ W*  
}; k)usUP'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); koEX4q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); UcLNMn|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); VMZ]n%XRXW  
BOOL InitHotkey(); }pE~85h4M  
BOOL UnInit(); zP(=,)d  
#endif g2{H^YUN$_  
}{wTlR.]  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. p=_XMh`;  
#include "stdafx.h" Vx6? @R  
#include "hook.h" 2iPmCG  
#include <windowsx.h> yOUX E>-  
#ifdef _DEBUG (ND5CKCR^  
#define new DEBUG_NEW r3H}*Wpf  
#undef THIS_FILE ^/C $L8#  
static char THIS_FILE[] = __FILE__; 1 73<x){  
#endif ,d>X/kd|o  
#define MAX_KEY 100 ?7kV+{.  
#define CTRLBIT 0x04 of'ZNQ/  
#define ALTBIT 0x02 !q$&JZY  
#define SHIFTBIT 0x01 -e{)v'C)  
#pragma data_seg("shareddata") oa &z/`@  
HHOOK hHook =NULL; 9U=fJrj'u  
UINT nHookCount =0; 5Hwo)S]r  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey VqClM  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT y^!E "  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey cF_;hD|YZ  
static int KeyCount =0; FS`vK`'  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \7t5U7v8U  
#pragma data_seg() `?]rr0.}hp  
HINSTANCE hins; yD[zzEuQ  
void VerifyWindow(); fEj9R@u+h  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) g>!:U6K  
//{{AFX_MSG_MAP(CHookApp) v dH+>l  
// NOTE - the ClassWizard will add and remove mapping macros here. jKj=#O  
// DO NOT EDIT what you see in these blocks of generated code! sArje(5Eo  
//}}AFX_MSG_MAP t8A kdSU0  
END_MESSAGE_MAP() b@wBR9s  
NDRW  
CHookApp::CHookApp() XatA8(_,5  
{ Cgz&@@j,]  
 // TODO: add construction code here, :J Gl>V  
 // Place all significant initialization in InitInstance `&u<aLA  
} [Y22Wi  
fwi};)K  
CHookApp theApp; i!Dh &XT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) !_U37Uj<m  
{ [arTx ^  
 BOOL bProcessed=FALSE; <o&o=Y8  
 if(HC_ACTION==nCode) DIG0:)4R.  
 { Jtp>m?1Ve  
  if((lParam&0xc0000000)==0xc0000000){// Key up [;?"R-V"z  
   switch(wParam) JFG",09]  
   { f`hyYp`d5  
    case VK_MENU: egI{!bZg'\  
     MaskBits&=~ALTBIT; ,pyQP^u-  
     break; QGH h;  
    case VK_CONTROL: -yC:?  
     MaskBits&=~CTRLBIT; 3tT|9Tb@  
     break; ` URSv,(  
    case VK_SHIFT: 8"km_[JE e  
     MaskBits&=~SHIFTBIT; c$Xe.:QY  
     break; "[jhaUAK  
    default: //judge the key and send message 6_R\l@a  
     break; _/,SZ-C#L4  
   } v)@,:u)  
   for(int index=0;index<MAX_KEY;index++){ <I7(eh6d  
    if(hCallWnd[index]==NULL) {H=oxa  
     continue; :cc[Jco@w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }rz dm9  
    { xdd:yrC   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~~C6)N~1  
     bProcessed=TRUE; 0).fBBNG  
    } T!l mO?Q  
   } [3j$ 4rP  
  } [ 8F \;  
  else if((lParam&0xc000ffff)==1){ //Key down LkJ$aW/  
   switch(wParam) T&1-eq>l  
   { {q&@nm40  
    case VK_MENU: @J-plJ4e  
     MaskBits|=ALTBIT; Qm.z@DwFM{  
     break; ;W7hc!  
    case VK_CONTROL: mi7sBA9L8  
     MaskBits|=CTRLBIT; l^k+E-w\  
     break; Mjb 1  
    case VK_SHIFT: p`>AnfG  
     MaskBits|=SHIFTBIT; 3<c*v/L{C\  
     break; [AXsnpa/C  
    default: //judge the key and send message |EF>Y9   
     break; sA/,+aM  
   } <9ma(PFa  
   for(int index=0;index<MAX_KEY;index++) )K{o<m~WAo  
   { ;#3ekl{-g  
    if(hCallWnd[index]==NULL) \s=QiPK  
     continue; Bu7A{DRf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %6AYCN?Ih  
    { UhsO\9}qH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 7dSh3f!  
     bProcessed=TRUE; (E!%v`_0  
    } RK?jtb=&A  
   } c}\ ' x5:o  
  } U? 8i'5)  
  if(!bProcessed){ Dba+z-3Nzy  
   for(int index=0;index<MAX_KEY;index++){ H}vn$$ O  
    if(hCallWnd[index]==NULL) VR "u*  
     continue; z>6.[Z(T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7egq4gN]2Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); GGCqtA^@7d  
   } F(deu^s%{  
  } %fHH{60  
 } $zdd=.!KiK  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); T`uDlo  
} X$/E>I  
j*XjY[  
BOOL InitHotkey() dIma{uv  
{ /x$}D=(CZ  
 if(hHook!=NULL){ y'^F,WTM  
  nHookCount++; neF8V"-u&  
  return TRUE; a;%I\w;2  
 } 5)w4)K-%  
 else u[)_^kIE(n  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); W:WQaF`2x  
  if(hHook!=NULL) cI5N"U@yN  
   nHookCount++; 5i6VZv  
  return (hHook!=NULL); (I[s3EnhS  
} > 84e`aGE  
BOOL UnInit() UanEzx%  
{ WhH!U0  
 if(nHookCount>1){ *m*`}9  
  nHookCount--; DacN {r"3  
  return TRUE; >E, Q  
 } yX`#s]M  
 BOOL unhooked = UnhookWindowsHookEx(hHook); w^3|(F  
 if(unhooked==TRUE){ 975 _d_U  
  nHookCount=0; p+$+MeBz  
  hHook=NULL; ?H`j>]%&  
 } 6F(hY !}5  
 return unhooked; wZQ)jo7*g  
} guU=NQZ  
$(3uOsy   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [P{a_(  
{ ^+wk  
 BOOL bAdded=FALSE; 40u7fojg2  
 for(int index=0;index<MAX_KEY;index++){ !~)90Z!  
  if(hCallWnd[index]==0){ \0nlPXk?G  
   hCallWnd[index]=hWnd; })P O7:  
   HotKey[index]=cKey; d .p'pGL  
   HotKeyMask[index]=cMask; wqP2Gw7jh6  
   bAdded=TRUE; > VP5vkv=  
   KeyCount++; b:1 L@8s;  
   break; /[%w*v*'  
  } okstY4f'  
 } ?pqU3-knH  
 return bAdded; cAb>2]M5V  
} w//omF'`  
yPoSJzC=[  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4@h;5   
{ uaaf9SL?  
 BOOL bRemoved=FALSE; ?_%u)S*g  
 for(int index=0;index<MAX_KEY;index++){ n}JPYu  
  if(hCallWnd[index]==hWnd){ 9Sz7\W0  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *}w+ 68eO  
    hCallWnd[index]=NULL; LL.x11 o3  
    HotKey[index]=0; pw\P<9e=  
    HotKeyMask[index]=0; oR#Ob#&  
    bRemoved=TRUE; >g]ON9CGH  
    KeyCount--; Plfdr~$  
    break; B$?^wo  
   } >'b=YlUL  
  } _w>uI57U  
 } V&%C\ns4  
 return bRemoved; a.q;_5\5`  
} x#r<,uNn,  
nR[^|CAR  
void VerifyWindow() cI:-Z{M7z  
{  m*dNrG  
 for(int i=0;i<MAX_KEY;i++){ H:Y&OZ  
  if(hCallWnd!=NULL){ [1SMg$@<  
   if(!IsWindow(hCallWnd)){ |cgui  
    hCallWnd=NULL; cS(;Qs]Q  
    HotKey=0; G>K@AW #  
    HotKeyMask=0; 0e16Ow6\!1  
    KeyCount--; 8vSIf+  
   } hF>u)%J/S  
  } @PX\{6&  
 } 2"X~ju  
} id?E)Jy  
OhFW*v  
BOOL CHookApp::InitInstance() <*wM=aq  
{ oL-2qtv  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); T<yb#ak  
 hins=AfxGetInstanceHandle(); KmmQ,e%  
 InitHotkey(); 2khh4?|\  
 return CWinApp::InitInstance(); e;h,V(  
} RV;!05^<  
0[Eb .2I  
int CHookApp::ExitInstance() ykmv'a$-4  
{ v@n_F  
 VerifyWindow(); E oe}l   
 UnInit(); u R:rO^  
 return CWinApp::ExitInstance(); ! %Ny0JkO  
} ?aWx(dVQ  
:o8MUXH$  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file '!Wvqs  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) pO]8 dE0  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ j_GBH8 `  
#if _MSC_VER > 1000 >;9NtoE  
#pragma once IZrk1fh  
#endif // _MSC_VER > 1000 t,<UohL|z  
{v,)G)obWw  
class CCaptureDlg : public CDialog 5jZiJw(  
{ J'Sm0  
 // Construction :m ZYS4L~  
 public: `]<`$71w  
  BOOL bTray; Fe!9y2Mg  
  BOOL bRegistered; fzPZ|  
  BOOL RegisterHotkey(); =J/FJb  
  UCHAR cKey; [Y/:@t"2y  
  UCHAR cMask; g7n "  
  void DeleteIcon(); ;gB`YNL  
  void AddIcon(); yWb4Ify  
  UINT nCount; rQr!R$t/[  
  void SaveBmp(); ,Eu?JH&}u  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor eB]R3j{  
  // Dialog Data  rLv;Y  
  //{{AFX_DATA(CCaptureDlg) Ia4)uV8  
  enum { IDD = IDD_CAPTURE_DIALOG }; #fDs[  
  CComboBox m_Key; *C2R`gpBI  
  BOOL m_bControl; {HrZ4xQnpV  
  BOOL m_bAlt; DNP@A4~  
  BOOL m_bShift; G%{0i20_  
  CString m_Path; QJBr6   
  CString m_Number; #*^+F?o,(  
  //}}AFX_DATA 5-vo0:hk  
  // ClassWizard generated virtual function overrides "pvH0"Q*  
  //{{AFX_VIRTUAL(CCaptureDlg) #g9ZX16}  
 public: |He=LQ }0  
  virtual BOOL PreTranslateMessage(MSG* pMsg); @~:8ye  
 protected: mYv(R!37'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Z :nbZHByh  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); $k%Z$NSN=  
  //}}AFX_VIRTUAL s\3q!A?S3  
  // Implementation &JhX +'U  
 protected: -t-tn22  
  HICON m_hIcon; [*4fwk^  
  // Generated message map functions =.Tv)/ea  
  //{{AFX_MSG(CCaptureDlg) lFq{O;q7}  
  virtual BOOL OnInitDialog(); +!yX T C  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); bw S*]!*  
  afx_msg void OnPaint(); z&}-8JykH  
  afx_msg HCURSOR OnQueryDragIcon(); |J>WC}g@n  
  virtual void OnCancel(); s V  }+eU  
  afx_msg void OnAbout(); :dnJY%/q  
  afx_msg void OnBrowse(); f.xA_Y>  
  afx_msg void OnChange(); 8dO?K*J,H'  
 //}}AFX_MSG 0.;}]v  
 DECLARE_MESSAGE_MAP() Q8nId<\(  
}; j6YiE~  
#endif ]?LB?:6  
zP)~a  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file S Xr%kndS  
#include "stdafx.h" 9pD 7 f`  
#include "Capture.h" #R&H &1  
#include "CaptureDlg.h" 4N>>+]MWc  
#include <windowsx.h> K8[DZ)rO;Z  
#pragma comment(lib,"hook.lib") 1hmc,c  
#ifdef _DEBUG )!W45"l-3M  
#define new DEBUG_NEW CIC[1,  
#undef THIS_FILE Lx[ ,Z,kD  
static char THIS_FILE[] = __FILE__; Wf26  
#endif |ys0`Vb=$  
#define IDM_SHELL WM_USER+1 NXk!qGV2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); p,W_'?,9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '%;\YD9  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; #x@eDnb_  
class CAboutDlg : public CDialog =Lp7{09u  
{ 3$/ 4wH^  
 public: q3w1GD  
  CAboutDlg(); +OHGn;C  
  // Dialog Data U1R4x!ym4  
  //{{AFX_DATA(CAboutDlg) E6MA?Ax&=  
  enum { IDD = IDD_ABOUTBOX }; 5.0e~zlM -  
  //}}AFX_DATA el PE%'  
  // ClassWizard generated virtual function overrides S: :>N.y  
  //{{AFX_VIRTUAL(CAboutDlg) K_&MoyJJ9f  
 protected: pdVQ*=c?M  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support h2q/mi5{  
  //}}AFX_VIRTUAL >Aq:K^D/3F  
  // Implementation zJN7<sv  
 protected: BlC<`2S  
  //{{AFX_MSG(CAboutDlg) xL "!~dN  
  //}}AFX_MSG >SmV74[s2  
  DECLARE_MESSAGE_MAP() C NrII sJ  
}; []pN$]+c  
LHYLC>J  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) X$n(-65  
{ =H`Q~ Xx  
 //{{AFX_DATA_INIT(CAboutDlg) _lxco=qd=%  
 //}}AFX_DATA_INIT j?i#L}.I  
} S?0$?w?  
l.=p8-/$'7  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) g=8un`]7  
{ !q"cpL'4  
 CDialog::DoDataExchange(pDX); 42C<1@>zO  
 //{{AFX_DATA_MAP(CAboutDlg) \Y|*Nee}XP  
 //}}AFX_DATA_MAP P:xT0gtt  
} hpbf&S4  
PAF8W lg  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 9$*s8}|  
 //{{AFX_MSG_MAP(CAboutDlg) 7<\C ?`q"  
 // No message handlers C(?blv-vM0  
 //}}AFX_MSG_MAP V-yUJ#f8[  
END_MESSAGE_MAP() tT%/r,  
Ri7((x]H"  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) t67Cv/r~  
: CDialog(CCaptureDlg::IDD, pParent) 5"KlRuv%  
{ 2umv|]n+l|  
 //{{AFX_DATA_INIT(CCaptureDlg) #1nJ(-D+  
  m_bControl = FALSE; 6p;m\  
  m_bAlt = FALSE; }j {!-&  
  m_bShift = FALSE; pox, Im  
  m_Path = _T("c:\\"); R{hf9R,  
  m_Number = _T("0 picture captured."); I/J7rkf  
  nCount=0; sy5 Fn~\R  
  bRegistered=FALSE; 6dqsFns}e  
  bTray=FALSE; cntco@  
 //}}AFX_DATA_INIT H*I4xT@  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 G;iEo4\?  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); y' C-[nk  
} Tny> D0Z#  
Z}6^ve  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) R W/z1  
{ xyh.N)  
 CDialog::DoDataExchange(pDX); $7Jo8^RE  
 //{{AFX_DATA_MAP(CCaptureDlg) }:Z9Vc ZP`  
  DDX_Control(pDX, IDC_KEY, m_Key); N_C;&hJN$w  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 9)dfL?x8V{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); $% k1fa C  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); $4=f+ "z  
  DDX_Text(pDX, IDC_PATH, m_Path); DvXHK  
  DDX_Text(pDX, IDC_NUMBER, m_Number); #/S {6c  
 //}}AFX_DATA_MAP gXFWxT8S  
} cI0 ]}S  
d9^E.8p$  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 30j|D3-  
//{{AFX_MSG_MAP(CCaptureDlg) ?=Pd  
 ON_WM_SYSCOMMAND() vw>jJ  
 ON_WM_PAINT() n$L51#'  
 ON_WM_QUERYDRAGICON() ._Zt=jB  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) mu]as: ~  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) (=x"Y{%  
 ON_BN_CLICKED(ID_CHANGE, OnChange) D@ek9ARAq  
//}}AFX_MSG_MAP I27,mS+]  
END_MESSAGE_MAP() F =a+z/xKT  
&dB-r&4;+  
BOOL CCaptureDlg::OnInitDialog() >pL2*O^{9  
{ q>!L6h5]t  
 CDialog::OnInitDialog(); i^`9syD  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); V >-b`e  
 ASSERT(IDM_ABOUTBOX < 0xF000); ~l[r a  
 CMenu* pSysMenu = GetSystemMenu(FALSE); uq3{h B#  
 if (pSysMenu != NULL) F"+o@9]  
 { 7L5P%zLtB  
  CString strAboutMenu; 8T[ 6J{|C  
  strAboutMenu.LoadString(IDS_ABOUTBOX); YNdrWBf)  
  if (!strAboutMenu.IsEmpty()) uzOYVN$t  
  { Dh| w^Q  
   pSysMenu->AppendMenu(MF_SEPARATOR); qQ[b VD\*  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 3Hi+Z}8  
  } ] ,etZ%z&  
 } C)-^<  
 SetIcon(m_hIcon, TRUE); // Set big icon \*vHB`.,ey  
 SetIcon(m_hIcon, FALSE); // Set small icon 1%[_`J;>Z  
 m_Key.SetCurSel(0); X@N$Z{  
 RegisterHotkey(); U\@A _ B  
 CMenu* pMenu=GetSystemMenu(FALSE); w*7|dZk{  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;U =q-tb  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); $m$;v<PSe  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); zt24qTKL  
 return TRUE; // return TRUE unless you set the focus to a control k3!a$0Bs;  
} /a9 !Cf  
1Nn@L2b 2  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Yf_6PGNzX  
{ ;r\(p|e  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Z4TL6 ]^R  
 { w42OF7f  
  CAboutDlg dlgAbout; :Sg&0Wj+#j  
  dlgAbout.DoModal(); 6aO2:|:yP  
 } +\ _{x/u1  
 else eP1nUy=T  
 { 5/><$06rq  
  CDialog::OnSysCommand(nID, lParam); ^?"\?M1  
 } cV K7  
} 0rSIfYZa  
5X.ebd;PT  
void CCaptureDlg::OnPaint() gApoX0nrv  
{ 0Wvq>R.(]7  
 if (IsIconic()) nv0@xnbz  
 { q(o/yx{bm  
  CPaintDC dc(this); // device context for painting 5FKBv e@  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); JNI>VP[c  
  // Center icon in client rectangle ?WI3/>:<  
  int cxIcon = GetSystemMetrics(SM_CXICON); I_)*)d44_  
  int cyIcon = GetSystemMetrics(SM_CYICON); fN%jJ-[d  
  CRect rect; +Lm4kA+aE5  
  GetClientRect(&rect); 'Ye v} QM  
  int x = (rect.Width() - cxIcon + 1) / 2; `|O yRU"EK  
  int y = (rect.Height() - cyIcon + 1) / 2; @`"AHt  
  // Draw the icon AnsjmR:Jv  
  dc.DrawIcon(x, y, m_hIcon); _;9!  
 } Xt/Ksw"wn  
 else 8kL4~(hY  
 { R,2=&+ e  
  CDialog::OnPaint(); D>L2o88  
 } ] f>]n  
} \{\MxXW  
hn)a@  
HCURSOR CCaptureDlg::OnQueryDragIcon() . 9G<y 4  
{ 4R%*Z ~  
 return (HCURSOR) m_hIcon; \YJy#2K  
} tq50fq'  
/TQ}} YVw  
void CCaptureDlg::OnCancel() <lxD}DH=  
{ 4DWwbO  
 if(bTray) [dX`K`k  
  DeleteIcon(); n| O [a6G  
  CDialog::OnCancel(); yqOuX>m1c  
} e&q?}Ho  
 l]!9$  
void CCaptureDlg::OnAbout() '(+<UpG_Q}  
{ Tpp&  
 CAboutDlg dlg; ?^#lWx q  
 dlg.DoModal(); :\~+#/=:  
} ~i;fDQ&!  
zdun,`6  
void CCaptureDlg::OnBrowse() #Doq P:  
{ 9%)=`W  
 CString str; O09ke-lC  
 BROWSEINFO bi; ,1{Ep`  
 char name[MAX_PATH]; hqSJ(gs{  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); :6kjEI  
 bi.hwndOwner=GetSafeHwnd(); h~Q)Uy5N(D  
 bi.pszDisplayName=name; >-< 8N-@"n  
 bi.lpszTitle="Select folder"; R>@uY( >dJ  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Vn=qV3OE]  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); KLQTKMNv  
 if(idl==NULL) B@v\eF;  
  return; mY!iu(R1  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?dZt[vAMn  
 str.ReleaseBuffer(); 9 t n!t  
 m_Path=str; ;,'igdold  
 if(str.GetAt(str.GetLength()-1)!='\\') oS,I~}\kQ  
  m_Path+="\\"; NVV}6TUV  
 UpdateData(FALSE); '(&%O8Yi  
} JWP*>\P  
;!@EixN-YH  
void CCaptureDlg::SaveBmp() =ziwxIo6  
{ U!w1AY|  
 CDC dc; nQK|n^AU/  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); hv$yV%.`  
 CBitmap bm; m#H3:-h,  
 int Width=GetSystemMetrics(SM_CXSCREEN); 4A`NJ  
 int Height=GetSystemMetrics(SM_CYSCREEN); -|yb[~3  
 bm.CreateCompatibleBitmap(&dc,Width,Height); AF,BwLN  
 CDC tdc; HG >j5  
 tdc.CreateCompatibleDC(&dc); wmr-}Y!9u%  
 CBitmap*pOld=tdc.SelectObject(&bm); u~zs* qp  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); lb' Cl3H  
 tdc.SelectObject(pOld); `'_m\uo  
 BITMAP btm; SU_SU".  
 bm.GetBitmap(&btm); ~q0*"\Ff  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; :7N3N  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); M.}7pJ7f  
 BITMAPINFOHEADER bih; #b0{#^S:  
 bih.biBitCount=btm.bmBitsPixel; 8t"~Om5sG  
 bih.biClrImportant=0; )wXuwdc[  
 bih.biClrUsed=0; C R<`ZNuWz  
 bih.biCompression=0; v{x{=M]  
 bih.biHeight=btm.bmHeight; -]G(ms;}/Y  
 bih.biPlanes=1; (LAXM x  
 bih.biSize=sizeof(BITMAPINFOHEADER); 2i#Sn'1  
 bih.biSizeImage=size; (kBP(2V  
 bih.biWidth=btm.bmWidth; ?|;yVew  
 bih.biXPelsPerMeter=0; 0Sl]!PZR1  
 bih.biYPelsPerMeter=0; 72 TI  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 3+7^uR$/I4  
 static int filecount=0; w]j+9-._  
 CString name; H%f:K2  
 name.Format("pict%04d.bmp",filecount++); CE NVp"C/`  
 name=m_Path+name; ^>4o$}  
 BITMAPFILEHEADER bfh; OvL\u{(<F  
 bfh.bfReserved1=bfh.bfReserved2=0; %rKK[  
 bfh.bfType=((WORD)('M'<< 8)|'B'); o@>? *=  
 bfh.bfSize=54+size; ER&UBUu"  
 bfh.bfOffBits=54; t6N*6ld2b  
 CFile bf; ~89P[$6  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 5__+_hO ;3  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); X+8B!F  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); |tMn={  
  bf.WriteHuge(lpData,size); /x@RNdKv  
  bf.Close(); c2SC|s]  
  nCount++; DmqX"x%P  
 } zRl~^~sY  
 GlobalFreePtr(lpData); DLPUqKL]  
 if(nCount==1) +';>=hha  
  m_Number.Format("%d picture captured.",nCount); E|"=. T  
 else =H7xD"'%R  
  m_Number.Format("%d pictures captured.",nCount); i?;r7>  
  UpdateData(FALSE); g8;D/  
} mo]KCi  
`RQ#.   
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) OV CR0  
{ 3cl9wWlJ_E  
 if(pMsg -> message == WM_KEYDOWN) 1pp -=$k  
 { WUdKLx %F  
  if(pMsg -> wParam == VK_ESCAPE) e= P  
   return TRUE; JYqSL)Ta*t  
  if(pMsg -> wParam == VK_RETURN) r~[vaQQ6L  
   return TRUE; m,LG=s  
 } lEL78l.  
 return CDialog::PreTranslateMessage(pMsg); 01a-{&   
} u8b2$D  
!,$i6gm  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1nj(h g  
{ `<\}FS`'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ beY=g7|  
  SaveBmp(); Ru!He,k7  
  return FALSE; @pV5}N[]  
} j{VGClb=T  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ {xcZ*m!B  
 CMenu pop; 7;`o( [N  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); D8K-K]W@  
 CMenu*pMenu=pop.GetSubMenu(0); ;_kzcK!l  
 pMenu->SetDefaultItem(ID_EXITICON); &UHPX?x  
 CPoint pt; _=6 rE  
 GetCursorPos(&pt); +WJ(QZEhD  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); HYr}wG  
 if(id==ID_EXITICON) _S0+;9fhY  
  DeleteIcon(); ajhEL?%D  
 else if(id==ID_EXIT) z:Sigo_z[  
  OnCancel(); H2gj=krK  
 return FALSE; {aKqXL[UP  
} F#|O@.tDG  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); P'@<:S|  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE)  84zTCX  
 AddIcon(); %bXx!x8(  
 return res; ]6Ug>>x5  
} zkM"cb13q/  
.uo.N   
void CCaptureDlg::AddIcon() 4] > ]-b  
{ `WEZ"5n  
 NOTIFYICONDATA data; *TW=/+j  
 data.cbSize=sizeof(NOTIFYICONDATA); KP;(Q+qTx  
 CString tip; Huw\&E  
 tip.LoadString(IDS_ICONTIP); d87vl13  
 data.hIcon=GetIcon(0); PrQ?PvA<L  
 data.hWnd=GetSafeHwnd(); vEM(bT=H  
 strcpy(data.szTip,tip); Zx }&c |Q  
 data.uCallbackMessage=IDM_SHELL; D:\g,\Z  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; /h2b;"  
 data.uID=98; dth&?/MERL  
 Shell_NotifyIcon(NIM_ADD,&data); fpyz'   
 ShowWindow(SW_HIDE); ;.s l*q1A  
 bTray=TRUE; I<b?vR 'F  
} >M!xiQX  
_GQz!YA  
void CCaptureDlg::DeleteIcon() jo +w>  
{ | aQ"3d  
 NOTIFYICONDATA data; EUYCcL'G  
 data.cbSize=sizeof(NOTIFYICONDATA); _:n b&B  
 data.hWnd=GetSafeHwnd(); Gm`}(;(A  
 data.uID=98; TOF '2&H  
 Shell_NotifyIcon(NIM_DELETE,&data); vh!v MB}}  
 ShowWindow(SW_SHOW); NIr@R7MKd  
 SetForegroundWindow(); k`HP "H  
 ShowWindow(SW_SHOWNORMAL); bSwWszd~  
 bTray=FALSE; ({0)@+V8  
} OIHz I2{  
?{"mP 'dD  
void CCaptureDlg::OnChange() :yT-9Ze%q  
{ $5`!Z%>/  
 RegisterHotkey(); D-imL;|  
} m%+IPZ2m  
%m5Q"4O  
BOOL CCaptureDlg::RegisterHotkey() {MAQ/5  
{ h5z)Lc^  
 UpdateData(); y@bcYOh3  
 UCHAR mask=0; pb60R|k  
 UCHAR key=0; ( <t_Pru  
 if(m_bControl) 9ILIEm:  
  mask|=4; tHD  
 if(m_bAlt) `+lHeLz':  
  mask|=2; 6< J #^ 6  
 if(m_bShift) YO{GU7  
  mask|=1; m^%|ZTrwN7  
  key=Key_Table[m_Key.GetCurSel()]; ?i\B^uB  
 if(bRegistered){ M/PFPJ >`  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); %,@vWmn  
  bRegistered=FALSE; +YOKA*  
 } qJ!Z~-hS  
 cMask=mask; ub0zJTFJ#  
 cKey=key; k@>\LR/v  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); yDb'7(3-  
 return bRegistered; >e5 *prx+  
} !U_ K&f  
- N>MBn  
  四、小结 $$i. O}  
.o%^'m"=D[  
  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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