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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: /'bX}H(dq  
  @={ qy}  
  一、实现方法 pwA~?$B1  
=TA8]7S~U  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: 7 LiyA<  
a._>?rVy  
#pragma data_seg("shareddata") vJ>o9:(6  
HHOOK hHook =NULL; //钩子句柄 ((6?b5[  
UINT nHookCount =0; //挂接的程序数目 ~e686L0j  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 EU'P U  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 `KieN/d%  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey m~gcc  
static int KeyCount =0; X#ud_+6x  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 B_"PFWwg  
#pragma data_seg() @u:q#b  
&pH XSU  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。  8(}cbW  
4p>,  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: -v9x tNg  
H?;@r1ZAn  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR E*L5D4Kw  
cKey,UCHAR cMask) Wp^ A.  
{ af&P;#U  
 BOOL bAdded=FALSE; O ]t)`+%q  
 for(int index=0;index<MAX_KEY;index++){  }D!o=Mg^  
  if(hCallWnd[index]==0){ 5m?9O7Pg  
   hCallWnd[index]=hWnd; Q5*"t*L!N  
   HotKey[index]=cKey;  ">q?(i\  
   HotKeyMask[index]=cMask; P&*e\"{  
   bAdded=TRUE; 'wo}1^V  
   KeyCount++; p\tA&>3-  
   break; .+5;AtN  
  } & z5:v-G?  
 } dA0o{[o=  
 return bAdded; pbG v\S F  
} tQ)l4Y 8  
//删除热键 >KJE *X@s  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) rE?B9BF3O  
{ r>t|.=!  
 BOOL bRemoved=FALSE; 07>D G#  
 for(int index=0;index<MAX_KEY;index++){ -~ Dn^B1^  
  if(hCallWnd[index]==hWnd){ I:YE6${k!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !4$-.L)#  
    hCallWnd[index]=NULL; 'K|F{K  
    HotKey[index]=0; 4Dasj8GsV  
    HotKeyMask[index]=0; pJ/{X=y  
    bRemoved=TRUE; +ux`}L(  
    KeyCount--; 1/A|$t[  
    break; 5qkyi]/U8  
   } ',I$`h  
  } vQ >8>V  
 } _Bhd@S!  
 return bRemoved; SGpe\P]k  
} [>lQi X  
&H2j3De  
?&POVf>  
  DLL中的钩子函数如下: M%5_~g2n'\  
[o.#$(   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) eH%i8a  
{ F`.W 9H3  
 BOOL bProcessed=FALSE; h@Ix9!?+  
 if(HC_ACTION==nCode) 0,6! 6>BOT  
 { wIF)(t-):  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 \ (U|&  
   switch(wParam) X|y0pH:S  
   {  <SRo2rjRa  
    case VK_MENU: @`aPr26>?  
     MaskBits&=~ALTBIT; |pE ~  
     break; X rut[)H  
    case VK_CONTROL: . Fm| $x  
     MaskBits&=~CTRLBIT; q0@b d2}  
     break; }{.V^;  
    case VK_SHIFT: \# 1p  
     MaskBits&=~SHIFTBIT; e?;  
     break; R[H#a v  
    default: //judge the key and send message \M~uNWv|  
     break; B XO,  
   } |lh&l<=(f  
   for(int index=0;index<MAX_KEY;index++){ ULxgvq  
    if(hCallWnd[index]==NULL) l;h5Y<A%?  
     continue; *7),v+ET  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) GZ.KL!,R!  
    { cpx:4R,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); U \jFB*U  
     bProcessed=TRUE; 0VIR =Pbp  
    } f_IsY+@  
   } LqS_%6^  
  } z/i&Lpr:  
  else if((lParam&0xc000ffff)==1){ //有键按下 }L>0}H  
   switch(wParam) `(~oZbErM  
   { v=-T3 n  
    case VK_MENU: +KIFLuL  
     MaskBits|=ALTBIT; ][>-r&V  
     break; .<6'*X R  
    case VK_CONTROL: K pmq C$  
     MaskBits|=CTRLBIT; >eX9dA3X  
     break; 2=X.$&a  
    case VK_SHIFT: t5EYu*  
     MaskBits|=SHIFTBIT; J n'SGR  
     break; u`u{\ xN9  
    default: //judge the key and send message zn5|ewl@"  
     break; hdYd2 j  
   } i \@a&tw  
   for(int index=0;index<MAX_KEY;index++){ D*ZswHT{y  
    if(hCallWnd[index]==NULL) #}[NleTVt  
     continue; U+ V yH4"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y.::d9v  
    { iL'j9_w,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); l^rQo_alk  
     bProcessed=TRUE; D~ 7W  
    } Bu4@FIK!C  
   } j_SUR)5  
  } Xkf|^-n  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 [vxHsY3z  
   for(int index=0;index<MAX_KEY;index++){ "nU] 2  
    if(hCallWnd[index]==NULL) P-X2A2  
     continue; ^N O4T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) MK <\:g  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); P5v;o9B&  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 LVJn2t^  
   } ]vH:@%3U  
  } &,$N|$yK}|  
 } @E=77Jn[px  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Jl ?_GX}ZY  
} ^(7Qz&q  
Z5[g[Q  
  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: Ce} m_  
y_2B@cj  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ym2"D?P (  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U=[isi+7  
xn1, o MY=  
  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: {X-a6OQj  
d/\ajQ1::  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Am#Pa,g  
{ dHtEyF  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) fRp(&%8E  
 { X5=I{eY}  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 RJdijj  
  SaveBmp(); vHb^@z=  
  return FALSE; [iC]Wh%  
 } WLCr~r^  
 …… //其它处理及默认处理 5X:3'*  
} W4)bEWO+q  
yn.[-  
TpxAp',#7  
  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。 u"DE?  
CM)V^k*  
  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。 ?3<Y/Vg%c  
Fp>nu_-"  
  二、编程步骤 LXf|n  
}|l7SFst  
  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"; c,}VC-  
jwheJ G  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; }l_8~/9  
n'!x"O7  
  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; .d+zF,02Z  
xxOhGA)  
  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; 593!;2/@  
,Uy;jk  
  5、 添加代码,编译运行程序。 Ei89Ngp\}  
3Qu-X\  
三、程序代码 T[2<_nn=  
C{,Vk/D-0  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL T75N0/teS  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) `)TgGny01  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ $}=r 45e0K  
#if _MSC_VER > 1000 M%7|7V<o)^  
#pragma once ^,` L!3  
#endif // _MSC_VER > 1000 'a"Uw"/p[  
#ifndef __AFXWIN_H__ uYijzHQyD  
#error include 'stdafx.h' before including this file for PCH 6Ia[`x uL  
#endif 3=%G{L16-  
#include "resource.h" // main symbols $dug"[  
class CHookApp : public CWinApp w4l]rH  
{ 4|DN^F~iut  
 public: JY3!jtv  
  CHookApp(); (t,mtdD#1  
  // Overrides :0Fc E,1  
  // ClassWizard generated virtual function overrides ;Pvnhy  
  //{{AFX_VIRTUAL(CHookApp) 1D%E})B6  
 public: 8tzL.P^  
  virtual BOOL InitInstance(); W3n[qVZIC  
  virtual int ExitInstance(); <]*Jhnx/  
  //}}AFX_VIRTUAL \8USFN~(Y  
  //{{AFX_MSG(CHookApp) ruy?#rk  
  // NOTE - the ClassWizard will add and remove member functions here. Y\F4  
  // DO NOT EDIT what you see in these blocks of generated code ! CiTWjE?|7  
  //}}AFX_MSG <eZrb6a'  
  DECLARE_MESSAGE_MAP() )M@^Z(W/a  
}; F1p|^hYDW  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ^!x qOp!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); n%!50E6*:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %1)JRc  
BOOL InitHotkey(); T#HF! GH]  
BOOL UnInit(); .`oKd@I*"  
#endif j?VHR$  
Ii>#9>!F  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. }d@;]cps  
#include "stdafx.h" ::@JL  
#include "hook.h" J!}R>mR  
#include <windowsx.h> m<!CF3g  
#ifdef _DEBUG #hXuGBZEI  
#define new DEBUG_NEW !04 ^E  
#undef THIS_FILE _S CY e  
static char THIS_FILE[] = __FILE__; #;UoZJ B  
#endif r>G||/Z  
#define MAX_KEY 100 R S] N%`]  
#define CTRLBIT 0x04 kD6Iz$tr  
#define ALTBIT 0x02 wV,=hMTd&\  
#define SHIFTBIT 0x01 qJw\<7m  
#pragma data_seg("shareddata") !. :b}t  
HHOOK hHook =NULL; u(JuU/U  
UINT nHookCount =0; 7<k@{xI/  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey  !>Q{co'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT "WH &BhQYD  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey wkT4R\H>  
static int KeyCount =0; EW/NH&{  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Pt'=_^Io  
#pragma data_seg() 2L=(-CH9]  
HINSTANCE hins; oUB9)C~  
void VerifyWindow(); #*3 vE& p  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) )4H0Bz2G  
//{{AFX_MSG_MAP(CHookApp) ,? Q1JZPy@  
// NOTE - the ClassWizard will add and remove mapping macros here. 7r pTk&`  
// DO NOT EDIT what you see in these blocks of generated code! &09G9GsnQ  
//}}AFX_MSG_MAP FV%|*JW[;N  
END_MESSAGE_MAP() <f0yh"?6VH  
x[$ :^5V  
CHookApp::CHookApp() ;}k_  
{ M->#WGl\B  
 // TODO: add construction code here, f|2QI ~R  
 // Place all significant initialization in InitInstance ,.&D{ $1W  
} o@YEd d  
r$%,k*X^ k  
CHookApp theApp; Kc+9n%sp  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) -#g0  
{ .[Ny(X/]/}  
 BOOL bProcessed=FALSE; >Fc=F#tA9  
 if(HC_ACTION==nCode) &+/$~@OK  
 { {<i(aq?  
  if((lParam&0xc0000000)==0xc0000000){// Key up ""jl  
   switch(wParam) GD!!xt  
   { A64c,Uv  
    case VK_MENU: |xpOU*k  
     MaskBits&=~ALTBIT; ,u14R]  
     break; \*c=bz&l  
    case VK_CONTROL: s*vtCdrE.  
     MaskBits&=~CTRLBIT; Sf t,$  
     break; OGW0lnQ/  
    case VK_SHIFT: jjg&C9w T  
     MaskBits&=~SHIFTBIT; ,fj~BkW{  
     break; T? ,Q=.  
    default: //judge the key and send message 3) XS^WG  
     break; nDNK}O~'  
   } 'f6!a5qC  
   for(int index=0;index<MAX_KEY;index++){ O\w-hk  
    if(hCallWnd[index]==NULL) bLUyZ3m!  
     continue; <O{G&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6lwWFR+k  
    { q4Y'yp`?K;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); UO-,A j*wW  
     bProcessed=TRUE; %gTY7LIe1z  
    } +Xmza8T9  
   } _ sBFs.o  
  } "p&4Sn3T2?  
  else if((lParam&0xc000ffff)==1){ //Key down Dj w#{WR  
   switch(wParam) W;8}`k  
   { 2F:X:f  
    case VK_MENU: z{qn|#}  
     MaskBits|=ALTBIT; Hlj3z3  
     break; M2nZ,I=l  
    case VK_CONTROL: ; $UB@)7%  
     MaskBits|=CTRLBIT; ,k m`-6.2?  
     break; oSP^ .BJ$  
    case VK_SHIFT: ?q"9ZYX<  
     MaskBits|=SHIFTBIT; mm N $\2  
     break; 5(y Q-/6C+  
    default: //judge the key and send message ~bfjP2 g  
     break; l{. XhB  
   } 5NMju!/  
   for(int index=0;index<MAX_KEY;index++) /-g%IeF  
   { t s=+k/Z  
    if(hCallWnd[index]==NULL) >  !WFY  
     continue; 3 FLht L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2O`s'&.h  
    { ;zi4W1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _Tf0L<A'R  
     bProcessed=TRUE; q_:B=w+bC  
    } -J++b2R\%  
   } 'z Qp64]F  
  } Y>K3.*.  
  if(!bProcessed){ q)]S:$?BT  
   for(int index=0;index<MAX_KEY;index++){ @oFuX.  
    if(hCallWnd[index]==NULL) ] -G~  
     continue; ~<=wTns!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 8uB6C0,6?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); , ins/-3  
   } 6Ou[t6  
  } M_\)<a(8  
 } {-s7_\|p(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); MG$Df$R  
} 2}.EFQp+  
~Yl%{1  
BOOL InitHotkey() o]0\Km  
{  !:|D[1m  
 if(hHook!=NULL){ S&~;l/  
  nHookCount++; 0,m@BsK  
  return TRUE; AkBEE  
 } Yn-;+ 4 K  
 else |A:+[35  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); "@&I*1&  
  if(hHook!=NULL) g=kuM  
   nHookCount++; L(3} H,t  
  return (hHook!=NULL); 9jrlB0  
} wTVd){q`.  
BOOL UnInit() -[>G@m:?e  
{ {I QCA-AI  
 if(nHookCount>1){ WSV% Oy3V  
  nHookCount--; @ {8x L  
  return TRUE; vce1'aW  
 } 3HB(rTw  
 BOOL unhooked = UnhookWindowsHookEx(hHook); MJ`BlE,Fmb  
 if(unhooked==TRUE){ zY\MzhkX,  
  nHookCount=0; (k>I!Z/&2  
  hHook=NULL; M!] g36h[  
 } I#](mRJ6  
 return unhooked; gz`P~7-w:  
} 'U4@Sax,  
G+jcR; s  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yA-UXKT  
{ %hb!1I  
 BOOL bAdded=FALSE; RhumNP<M  
 for(int index=0;index<MAX_KEY;index++){ <,(Ww   
  if(hCallWnd[index]==0){ yyu f  
   hCallWnd[index]=hWnd; 8,&QY%8pX  
   HotKey[index]=cKey; Z~ {[YsG  
   HotKeyMask[index]=cMask; R>`TV(W`9  
   bAdded=TRUE; r!O4]j_3  
   KeyCount++; OEj%cB!  
   break; 7a'@NgiGg  
  } )Xd2qbi  
 } F5/,H:K\  
 return bAdded; kI#yW!  
} y ;T=u(}  
d i#:KW  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) NFlrr*=t>  
{ )\0LxsZ  
 BOOL bRemoved=FALSE; EyPF'|Qtn  
 for(int index=0;index<MAX_KEY;index++){ Z<6Fq*I  
  if(hCallWnd[index]==hWnd){ e(sV4Z~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;PG,0R`Z;  
    hCallWnd[index]=NULL; ~0XV[$`L  
    HotKey[index]=0; j?9fb  
    HotKeyMask[index]=0;  9/R<,  
    bRemoved=TRUE; }TAHVcX*p  
    KeyCount--; naWW i]9  
    break; zrCQEQq  
   } gAViwy9{  
  } >&2n\HR\  
 } %^66(n)  
 return bRemoved; WG.J-2#3  
} {,b:f  
"ku ?A^f  
void VerifyWindow() >Y[nU~w  
{ 'Gds?o8  
 for(int i=0;i<MAX_KEY;i++){ \H$j["3  
  if(hCallWnd!=NULL){ %4HpTx  
   if(!IsWindow(hCallWnd)){ X |X~|&j  
    hCallWnd=NULL; vd!|k5t[d  
    HotKey=0; $Xr9<)?,  
    HotKeyMask=0; ]{'lV~fc  
    KeyCount--; E7UYJ)6]  
   } 4+_r0  
  } }@S''AA\  
 } :6X?EbXhK  
} L BP|  
0'.7dzz  
BOOL CHookApp::InitInstance() U `<?~Bz  
{ \%011I4  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); S) [$F}  
 hins=AfxGetInstanceHandle(); a#:K"Mf.  
 InitHotkey(); ^zVBS7`J  
 return CWinApp::InitInstance(); .|9o`mF7  
} !]z6?kUK  
S`?cs^?  
int CHookApp::ExitInstance() gw);b)&mx  
{ 9Wi+7_)  
 VerifyWindow(); jFMf=u&U  
 UnInit(); +XN/ bT  
 return CWinApp::ExitInstance(); b".e6zev  
} p[M*<==4  
F),wj8#~>-  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 5W=jQ3 C  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) &fYV FRVkq  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .kkrU  
#if _MSC_VER > 1000 KQ(7%W  
#pragma once F-2&P:sjQ  
#endif // _MSC_VER > 1000 ' Zmslijf  
b#[7A  
class CCaptureDlg : public CDialog IHlTp0?  
{ q-)Ynp4'  
 // Construction c- {;P>L  
 public: `;fk,\8t%  
  BOOL bTray; =/jCDY  
  BOOL bRegistered; |&]04  
  BOOL RegisterHotkey(); my^2}>wi  
  UCHAR cKey; 5U+a{oA  
  UCHAR cMask; XKq}^M&gy  
  void DeleteIcon(); d;9F2,k$w  
  void AddIcon();  E\! <=  
  UINT nCount; T=n)ea A  
  void SaveBmp(); nd/.]"  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor m=uW:~  
  // Dialog Data rF8n z:8  
  //{{AFX_DATA(CCaptureDlg) O A9G] 8k  
  enum { IDD = IDD_CAPTURE_DIALOG }; *(sUz?t  
  CComboBox m_Key; F ak"u'~  
  BOOL m_bControl; =`MU*Arcs[  
  BOOL m_bAlt; v{dvB:KP5X  
  BOOL m_bShift; pl.K*9+  
  CString m_Path; rWo&I _{  
  CString m_Number; ?pJUbZ#J  
  //}}AFX_DATA ;jgJI~3l  
  // ClassWizard generated virtual function overrides =(Ll}V,  
  //{{AFX_VIRTUAL(CCaptureDlg) -h/KrB  
 public: >^fkHbgNQ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); f^63<gqY  
 protected: S=bdue  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?nya;Z-~Hc  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); .:)nG(7f<  
  //}}AFX_VIRTUAL ') -Rv]xe  
  // Implementation )+ss)L EC  
 protected: vtS [Tkk|A  
  HICON m_hIcon; Os# V=P  
  // Generated message map functions GcL:plz  
  //{{AFX_MSG(CCaptureDlg) ]VU a $$  
  virtual BOOL OnInitDialog(); g,N"o72)  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); IfdgMELk  
  afx_msg void OnPaint(); MSw:Ay [9  
  afx_msg HCURSOR OnQueryDragIcon(); i$:\,  
  virtual void OnCancel(); X( H-U q*(  
  afx_msg void OnAbout(); g^dPAjPQ  
  afx_msg void OnBrowse(); sZ!/uN!6  
  afx_msg void OnChange(); CI };$4W~  
 //}}AFX_MSG XvIrO]F-  
 DECLARE_MESSAGE_MAP() C/{tvY /o  
}; eZ^-gk?  
#endif -:|1>og  
{IlX@qWr  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `1eGsd,f  
#include "stdafx.h" z` :uvEX0  
#include "Capture.h" =U_WrY<F  
#include "CaptureDlg.h" SqF9#&F  
#include <windowsx.h> e(NpX_8  
#pragma comment(lib,"hook.lib") rprtp5Cg  
#ifdef _DEBUG xxN=,p  
#define new DEBUG_NEW wwtk6;8@  
#undef THIS_FILE mz~aSbb|  
static char THIS_FILE[] = __FILE__; i9FHEu_  
#endif mar BVFz~  
#define IDM_SHELL WM_USER+1 eaI!}#>R +  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); P{-f./(JD  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); FB-_a  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; #l!Sz247  
class CAboutDlg : public CDialog KF#,Q  
{ 3'H 1T  
 public: y~cDWD <h  
  CAboutDlg(); *Q@%< R  
  // Dialog Data ^mu?V-4  
  //{{AFX_DATA(CAboutDlg) >lRa},5(  
  enum { IDD = IDD_ABOUTBOX }; HJn  
  //}}AFX_DATA Z,~EH  
  // ClassWizard generated virtual function overrides ,`3kDqS_4  
  //{{AFX_VIRTUAL(CAboutDlg) FYe(S V(9  
 protected: k>8,/ AZd  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `n# {}%  
  //}}AFX_VIRTUAL zMUifMiAj  
  // Implementation $]G_^ji)K  
 protected: ;&N;6V"}  
  //{{AFX_MSG(CAboutDlg) _;Q1P gT  
  //}}AFX_MSG 3\xvy{r  
  DECLARE_MESSAGE_MAP() PV*U4aP  
}; nzdJ*C  
8p?Fql}F [  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) %z(nZ%,Z  
{ -}B&>w,5  
 //{{AFX_DATA_INIT(CAboutDlg) @} 61D  
 //}}AFX_DATA_INIT F .(zS(q  
} ;eG,T-:  
AC$:.KLI  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) q5irKT*Hs  
{ wi]F\ q"Y^  
 CDialog::DoDataExchange(pDX); :CQ-?mT^LA  
 //{{AFX_DATA_MAP(CAboutDlg) a/Cd;T2  
 //}}AFX_DATA_MAP .7ZV: m  
} k|^e=I   
m{/?6h 1  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) b|cUKsL5  
 //{{AFX_MSG_MAP(CAboutDlg) ng-g\&-  
 // No message handlers z4 snH%q  
 //}}AFX_MSG_MAP V'";u?h#S  
END_MESSAGE_MAP() |g3a1El  
wX_s./#JJ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) P+m{hn~%  
: CDialog(CCaptureDlg::IDD, pParent) Hq{i-z+  
{ w!0`JPu  
 //{{AFX_DATA_INIT(CCaptureDlg) ~f[AEE~,s+  
  m_bControl = FALSE; 1Qi5t?{  
  m_bAlt = FALSE; ;_.%S*W\  
  m_bShift = FALSE; !z !R)6  
  m_Path = _T("c:\\"); [f'V pId8  
  m_Number = _T("0 picture captured."); :<    
  nCount=0; ;'.[h*u~<  
  bRegistered=FALSE; 0u]!C"VX  
  bTray=FALSE; Xgge_`T9  
 //}}AFX_DATA_INIT 6iiH+Nc  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 -/>SdR$D7  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 88)F-St  
} io[$QTY  
iUv#oX H  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) T9@W,0#  
{ nV|H5i;N7  
 CDialog::DoDataExchange(pDX); NArql  
 //{{AFX_DATA_MAP(CCaptureDlg) %"2 ;i@  
  DDX_Control(pDX, IDC_KEY, m_Key); : GZx-  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ?N 6'*2{NT  
  DDX_Check(pDX, IDC_ALT, m_bAlt); v'"0Ya  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 73kF=*m  
  DDX_Text(pDX, IDC_PATH, m_Path); < p<J;@  
  DDX_Text(pDX, IDC_NUMBER, m_Number); |fx*F}1  
 //}}AFX_DATA_MAP 'n7 )()"2  
} )Q_^f'4  
+ht -Bl  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) <<zYF.9L]  
//{{AFX_MSG_MAP(CCaptureDlg) hrpql_9.  
 ON_WM_SYSCOMMAND() s3+^q  
 ON_WM_PAINT() n M +(  
 ON_WM_QUERYDRAGICON() wic& $p/%  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) }n+#o!uEf  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 6]=$c<.&  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ^:.=S`,^  
//}}AFX_MSG_MAP de?Bn+mvi.  
END_MESSAGE_MAP() ]]\\Y|0  
:27GqY,3sK  
BOOL CCaptureDlg::OnInitDialog() 5 ",@!1ju  
{ 8Bvc# +B  
 CDialog::OnInitDialog(); WUQlAsme  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); YQyf:xJ  
 ASSERT(IDM_ABOUTBOX < 0xF000); ~ kdxJP"  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 5]/i[T_  
 if (pSysMenu != NULL) bk@F/KqL  
 { <,%qt_ !  
  CString strAboutMenu; W}<'Y@[ ,  
  strAboutMenu.LoadString(IDS_ABOUTBOX); lg)jc3  
  if (!strAboutMenu.IsEmpty()) 1gEeZ\B-&  
  { _raj b1!  
   pSysMenu->AppendMenu(MF_SEPARATOR); ?mdgY1  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); a#iJXI  
  } 'eNcQJh  
 } i ez@j  
 SetIcon(m_hIcon, TRUE); // Set big icon -^m]Tb<u  
 SetIcon(m_hIcon, FALSE); // Set small icon 29(s^#e8A  
 m_Key.SetCurSel(0); q[l!kC+Eh  
 RegisterHotkey(); H pHXt78  
 CMenu* pMenu=GetSystemMenu(FALSE);  FSaCbs(  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); VCzmTnD  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); VTOZ #*f  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); fVlTsc|e  
 return TRUE; // return TRUE unless you set the focus to a control n\f8%z  
} s2-`}LL  
xXpeo_y'  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) {&_1/  
{ ,/O,j SRk  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Byx8`Cx1  
 { G j6(ycaS  
  CAboutDlg dlgAbout; lkNaSz[  
  dlgAbout.DoModal(); mM| 313  
 } 3snr-)   
 else D$W&6'  
 { 26yjQ  
  CDialog::OnSysCommand(nID, lParam); x>5"7MR`  
 } !,f{I5/  
} P&Vqr  
:x*|?zII  
void CCaptureDlg::OnPaint() C?v_ig  
{ [<;4$}f\  
 if (IsIconic()) 6xk~Bt  
 { _`4jzJ*  
  CPaintDC dc(this); // device context for painting Pqe{C?7B  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); xh$1Rwa  
  // Center icon in client rectangle "PM!03rb  
  int cxIcon = GetSystemMetrics(SM_CXICON); !;";L5()  
  int cyIcon = GetSystemMetrics(SM_CYICON); ;9>(yJI+  
  CRect rect; biTET|U`$  
  GetClientRect(&rect); BU-m\Kf)  
  int x = (rect.Width() - cxIcon + 1) / 2; ^oNk}:>  
  int y = (rect.Height() - cyIcon + 1) / 2; )Mw<e  
  // Draw the icon 6%/@b`vZ  
  dc.DrawIcon(x, y, m_hIcon); OR4ZjogzY  
 } Q{hXP*5  
 else 1bW[RK;GE  
 { \`:X37n)0q  
  CDialog::OnPaint(); 2&st/y(hs  
 } %#!pAUP\&  
} %d..L-`]ET  
 >'>onAIL  
HCURSOR CCaptureDlg::OnQueryDragIcon() 8cqH0{  
{ Z^AOV:|m  
 return (HCURSOR) m_hIcon; q.s2x0  
} ~f/nq/8  
YzTmXwuA5  
void CCaptureDlg::OnCancel() q9GSUkb  
{ "I"(yiKD  
 if(bTray) g. V6:>,  
  DeleteIcon(); )sWC5\  
  CDialog::OnCancel(); FyZp,uD  
} mTG v*=l  
7M~w05tPh  
void CCaptureDlg::OnAbout() +}IOTw" O`  
{ ( Z-~Eh  
 CAboutDlg dlg; 5r;M61  
 dlg.DoModal(); w Phs1rL  
} u="VJ3  
9EryHV|  
void CCaptureDlg::OnBrowse() y/!h.[  
{ $tGk,.#j  
 CString str; C]22 [v4  
 BROWSEINFO bi; x.Sq2rw]V  
 char name[MAX_PATH]; oz!;sj{,D  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); R)s@2S  
 bi.hwndOwner=GetSafeHwnd(); {1H3VSYq  
 bi.pszDisplayName=name; Q fI =  
 bi.lpszTitle="Select folder"; 8mM^wT  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; JGS4r+   
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); mlolSD;7  
 if(idl==NULL) lM1Y }  
  return; v!oXcHK/  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Dps0$f c  
 str.ReleaseBuffer(); J1,\Q<  
 m_Path=str; 01md@4NQ  
 if(str.GetAt(str.GetLength()-1)!='\\') ?n$;l-m[  
  m_Path+="\\"; 39s%CcI`k  
 UpdateData(FALSE); ifA{E}fRZP  
} Zj )Bd* a  
Gy*6I)l  
void CCaptureDlg::SaveBmp() hhu !'(j  
{ Isa]5>  
 CDC dc; *ujn+0)[  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); `WDN T0@M  
 CBitmap bm; *,w9#?2x  
 int Width=GetSystemMetrics(SM_CXSCREEN); 'je=.{[lWt  
 int Height=GetSystemMetrics(SM_CYSCREEN); 7<W7pXDp  
 bm.CreateCompatibleBitmap(&dc,Width,Height); joa|5v'  
 CDC tdc; : b^\O  
 tdc.CreateCompatibleDC(&dc); #q`-"2"|  
 CBitmap*pOld=tdc.SelectObject(&bm); 1:I47/  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Z-(Vfp4  
 tdc.SelectObject(pOld); l`s_Id#  
 BITMAP btm; 9Ra_[1  
 bm.GetBitmap(&btm); n !ty\E  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; L_Q1:nL-0  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 'Wv=mBEfZ  
 BITMAPINFOHEADER bih; e<_p\LiOS  
 bih.biBitCount=btm.bmBitsPixel; ocwh*t)<k  
 bih.biClrImportant=0; wIi_d6?  
 bih.biClrUsed=0; 2=pVX  
 bih.biCompression=0; )*[3Imq/  
 bih.biHeight=btm.bmHeight; ^MPl wx  
 bih.biPlanes=1; Og8:  
 bih.biSize=sizeof(BITMAPINFOHEADER); h#K863  
 bih.biSizeImage=size; |2,'QTm=  
 bih.biWidth=btm.bmWidth; 0) }bJ,5/  
 bih.biXPelsPerMeter=0; ;M '?k8L  
 bih.biYPelsPerMeter=0; cnh\K.*}_x  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ]V!q"|  
 static int filecount=0; ~`Q8)(y<#$  
 CString name; ^cO^3=  
 name.Format("pict%04d.bmp",filecount++); &P Ru[!  
 name=m_Path+name; <&3qFK*9r  
 BITMAPFILEHEADER bfh; !|P>%bi  
 bfh.bfReserved1=bfh.bfReserved2=0; \wY? 6#;  
 bfh.bfType=((WORD)('M'<< 8)|'B'); _9!_fIY  
 bfh.bfSize=54+size; Xz`?b4i  
 bfh.bfOffBits=54; =y" lX{}G  
 CFile bf; g0-hN%=6  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ _1w?nN'  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2J;h}/!H  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Q/T\Rr_d  
  bf.WriteHuge(lpData,size); 9;3f`DK@2k  
  bf.Close(); [([?+Ouy  
  nCount++; y>zPsc,  
 } S?.2V@Ic  
 GlobalFreePtr(lpData); !Kv.v7'N/k  
 if(nCount==1) yQ)y#5/<6  
  m_Number.Format("%d picture captured.",nCount); $Bd{Y"P@6  
 else 9)={p9FZY  
  m_Number.Format("%d pictures captured.",nCount); Ql-RbM  
  UpdateData(FALSE); "T4Z#t  
} &f1dCL%z7  
E7E>w#T5  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) g0w<vD`<g  
{ $0rSb0[  
 if(pMsg -> message == WM_KEYDOWN) W2Y%PD9a  
 { XjpFJ#T*$A  
  if(pMsg -> wParam == VK_ESCAPE) Q>s>@hw  
   return TRUE; 1X\dH<B}  
  if(pMsg -> wParam == VK_RETURN) 6yZfV7I  
   return TRUE; Cg NfqT0  
 } B42.;4"T  
 return CDialog::PreTranslateMessage(pMsg); %h;~@-$  
} Bfw]#"N`  
=8`,,=P^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~fLuys`*:  
{ A-:58Qau+  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ZgCG'SU  
  SaveBmp(); $Oa} U3  
  return FALSE;  k?|l;6  
} z38&7+  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ (7w`BR9B  
 CMenu pop; fk%r?K6K  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ]Auk5M+  
 CMenu*pMenu=pop.GetSubMenu(0); 7_>No*[  
 pMenu->SetDefaultItem(ID_EXITICON); (JS1}T  
 CPoint pt; X)iQ){21V  
 GetCursorPos(&pt); :| J' HCth  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); *7<5 G{  
 if(id==ID_EXITICON) :AYp{"{  
  DeleteIcon(); ffo{ 4er  
 else if(id==ID_EXIT) `"J=\3->  
  OnCancel(); qYj EQz  
 return FALSE; X-Y:)UT  
} O)|{B>2r  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); &d]%b`EXq  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) H3T4v1o6  
 AddIcon(); lb3:#?  
 return res; L{xCsJ3d  
} }9[E+8L1  
@K`2y'#b  
void CCaptureDlg::AddIcon() GD?4/HkF  
{ 9(k5Irv"'h  
 NOTIFYICONDATA data; Jvt| q5  
 data.cbSize=sizeof(NOTIFYICONDATA); L2Ynv4llm  
 CString tip; L~fx VdUz  
 tip.LoadString(IDS_ICONTIP); -AcLh0pc  
 data.hIcon=GetIcon(0); ^`NU:"  
 data.hWnd=GetSafeHwnd(); } =Yvs)  
 strcpy(data.szTip,tip); E[bJ5o**#  
 data.uCallbackMessage=IDM_SHELL; k4te[6)  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; h32QEz-+  
 data.uID=98; CqQ>"Y  
 Shell_NotifyIcon(NIM_ADD,&data); R%iyNK,  
 ShowWindow(SW_HIDE); l@ vaupg  
 bTray=TRUE; x_lCagRGC4  
} D{YAEG   
]Ga}+^  
void CCaptureDlg::DeleteIcon() SBo>\<@  
{ -d? 9Acd  
 NOTIFYICONDATA data; 3uO#/EbS  
 data.cbSize=sizeof(NOTIFYICONDATA); v5U\E`)s  
 data.hWnd=GetSafeHwnd(); 5tI4m#y2  
 data.uID=98; B:dk>$>uQ  
 Shell_NotifyIcon(NIM_DELETE,&data); U%3d_"{;  
 ShowWindow(SW_SHOW); [80jG+6  
 SetForegroundWindow(); P]A>"-k  
 ShowWindow(SW_SHOWNORMAL); -?gr3rV@  
 bTray=FALSE; lNuZg9h  
} K@lZuQ.1  
nsWenf  
void CCaptureDlg::OnChange() Z_{`$nW  
{ 1qXqQA  
 RegisterHotkey(); lquY_lrri  
} +9db1:  
FWqnlK#  
BOOL CCaptureDlg::RegisterHotkey() NBzyP)2)  
{ G+?@4?` z  
 UpdateData(); &!uw;|%  
 UCHAR mask=0; |UvM [A|+  
 UCHAR key=0; /Y:1zLs%  
 if(m_bControl) 6#P\DT  
  mask|=4; jH26-b<  
 if(m_bAlt) ,Oojh;P_  
  mask|=2; WoGK05w  
 if(m_bShift) p#HbN#^Hy  
  mask|=1; "/6<k0.D&  
  key=Key_Table[m_Key.GetCurSel()]; u*u>F@C8  
 if(bRegistered){ 8%OS ,Z  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); p@`rBzGp  
  bRegistered=FALSE; g'G%BX  
 } <I .p{Z  
 cMask=mask; rJi;"xF8  
 cKey=key; 2*:lFv wP  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); WJvD,VMz  
 return bRegistered; jT/SZ|S  
} +!9&E{pmo  
^zn j J\  
  四、小结 cn1CM'Ru  
_[}r2,e  
  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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