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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: U?^OD  
  g4Y) Bz  
  一、实现方法 IDj_l+?c  
' Q\@19  
  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: :*#rRQ>t  
^)|&|  
#pragma data_seg("shareddata") o1e4.-xI  
HHOOK hHook =NULL; //钩子句柄 3 sl=>;-  
UINT nHookCount =0; //挂接的程序数目 |Mt&p#y  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 8B j4 _!g  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 HC?0Lj  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey P= e4lF.  
static int KeyCount =0; 'c#IMlv  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 h iAxh Y  
#pragma data_seg() mU>&ql?e  
+a #lofhv  
  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。 )^&,Dj   
<]~ZPk[  
  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: Rl1$?l6Rf  
`ovgWv  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR \N?7WQ  
cKey,UCHAR cMask) 5qC:yI  
{ }X.>4\B5  
 BOOL bAdded=FALSE; L1rwIOgq^  
 for(int index=0;index<MAX_KEY;index++){ &&&9  
  if(hCallWnd[index]==0){ yji>*XG  
   hCallWnd[index]=hWnd; ?<! nm&~  
   HotKey[index]=cKey; Vz'HM$  
   HotKeyMask[index]=cMask; UkZ\cc}aC/  
   bAdded=TRUE; z /weit  
   KeyCount++; 7 %3<~'v[  
   break; ZBF1rx?  
  } \<X2ns@Tf  
 } l nfm0  
 return bAdded; #XcU{5Qm5  
} -/zp&*0gcx  
//删除热键 <>]1Y$^Y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) pL! a  
{ IJ0#iA. T  
 BOOL bRemoved=FALSE; 7RD$=?oO'  
 for(int index=0;index<MAX_KEY;index++){ #K|0lau l  
  if(hCallWnd[index]==hWnd){ \04mLIJr9  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |gW    
    hCallWnd[index]=NULL; (|dPeix|  
    HotKey[index]=0; <~N%W#z/  
    HotKeyMask[index]=0; Vg{Zv4+t  
    bRemoved=TRUE; p!}ZdX[u  
    KeyCount--; mW~P!7]  
    break; U_l7CCK +  
   } ;Xyte  
  } )%qtE34`  
 } IfMpY;ow=  
 return bRemoved; 9qr UM`z$g  
} Z^*NnL.'  
mpAHL(  
q4k.f_{  
  DLL中的钩子函数如下: {c@G$  
gM#jA8gz  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \-c#jo.$8  
{ :@/"abv  
 BOOL bProcessed=FALSE; e=7W 7^"_  
 if(HC_ACTION==nCode)  &+G; R  
 { t7bqk!6hM\  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 SRItE\"Xe  
   switch(wParam) ~p\n&{P0  
   {  rGQ5l1</  
    case VK_MENU: @;;G88=  
     MaskBits&=~ALTBIT; 3b@VY'P  
     break; };r|}v !~_  
    case VK_CONTROL: 7TpRCq#  
     MaskBits&=~CTRLBIT; (N0sE"_~I5  
     break; O:e#!C8^  
    case VK_SHIFT: @o&Ytd;i  
     MaskBits&=~SHIFTBIT; ?Wa<AFXQ  
     break; LWD#a~  
    default: //judge the key and send message nv)))I\  
     break; 6{.J:S9n   
   } !R6ApB4ZI  
   for(int index=0;index<MAX_KEY;index++){ _f|/*. @Q  
    if(hCallWnd[index]==NULL) ,#d[ad<  
     continue; `eC+% O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;Xu22f Kh  
    { ?}8IQxU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); B?3juyB`--  
     bProcessed=TRUE; hVM2/j  
    } Xu#:Fe}:  
   } Xpl?g=B&u  
  } 88l,&2q  
  else if((lParam&0xc000ffff)==1){ //有键按下 nP1GW6Pu  
   switch(wParam) 8_a3'o%5  
   { `%=<R-/#7S  
    case VK_MENU: \ I:.<2i  
     MaskBits|=ALTBIT; aMJ;bQD  
     break; {cR=N~_EO  
    case VK_CONTROL: Rh<N);Sl7  
     MaskBits|=CTRLBIT; DsGI/c  
     break; %i"}x/CD[  
    case VK_SHIFT: 5un^yRMB-  
     MaskBits|=SHIFTBIT; @5E,:)T*wR  
     break; ^N-'xy  
    default: //judge the key and send message j5^-.sEEw  
     break; b#a@ rh  
   } :Q7mV%%  
   for(int index=0;index<MAX_KEY;index++){ X;VQEDMPU  
    if(hCallWnd[index]==NULL) smup,RNZRX  
     continue; 2h q>T&8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) x8\<qh*:  
    { [l*;E f,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); mU@xc N  
     bProcessed=TRUE; <lj\#'G3  
    } R ]P;sk5  
   } si(cOCj/  
  } ($>XIb9f  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 [s}/nu~U  
   for(int index=0;index<MAX_KEY;index++){ 4pPI'd&/7  
    if(hCallWnd[index]==NULL) e_rzA  
     continue; !ni>\lZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ]JMl|e  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); K5`Rk" s  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Jhy(x1%  
   } 10O$'`  
  } p3yU:q#A  
 } ;^3$kF  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ; )llt G  
} Q9slfQ  
 g_q<ze  
  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: {Uq:Xw   
H;S%Y`V  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); CW`!}yu%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); f Iy]/  
>emcJVYV`[  
  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: @;Y~frT  
_u5dC   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /S~m)$vu  
{ %Q~CB7ILK  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) j O8k6<l  
 { K)N0,Qwu  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 |[1D$Qv  
  SaveBmp(); @cv{rr  
  return FALSE; .:9s}%Z r  
 } CDdkoajBa  
 …… //其它处理及默认处理 1*UN sEr  
} LchnBtjn  
&tE.6^F  
/k6fLn2;  
  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。 6+` tn  
Yc;ec9~  
  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。 n7l%gA*  
RiR:69xwR*  
  二、编程步骤 i9m*g*"2  
b$- e\XB!  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 9 26Tl  
}V`mp  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; yPgmg@G@/  
ir[jCea,  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; z$[C#5+2  
>oJkJ$|wU  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; TH?9< C-C  
`ifiL   
  5、 添加代码,编译运行程序。 ao$.6X8fQ  
FWY2s(5p  
三、程序代码 IIz0m3';+  
 }roG(  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL '{[),*nCn  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 2Z/K(J"&J  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ MGt]'}  
#if _MSC_VER > 1000 JTW)*q9a  
#pragma once Q6'nSBi:A_  
#endif // _MSC_VER > 1000 L*JPe"N -e  
#ifndef __AFXWIN_H__ ;>"nn VW  
#error include 'stdafx.h' before including this file for PCH P Sx304  
#endif g/Wh,f3  
#include "resource.h" // main symbols c`G&KCw)d  
class CHookApp : public CWinApp '2nqHX D  
{ i8PuC^]  
 public: Qa`hR  
  CHookApp(); ^b-18 ~s  
  // Overrides tIuoD+AW  
  // ClassWizard generated virtual function overrides nII^mg~  
  //{{AFX_VIRTUAL(CHookApp) sl|_=oXT  
 public: jirbUl  
  virtual BOOL InitInstance(); glUo7^ay7  
  virtual int ExitInstance(); nH[+n `{o  
  //}}AFX_VIRTUAL f3tv3>p  
  //{{AFX_MSG(CHookApp) * fc-gAj  
  // NOTE - the ClassWizard will add and remove member functions here. *xs!5|n+  
  // DO NOT EDIT what you see in these blocks of generated code ! kB P*K  
  //}}AFX_MSG )S@jDaU<  
  DECLARE_MESSAGE_MAP() I+;-p]~  
}; L%cVykWY"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); f CcD&<%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); aT!;{+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hOk00az  
BOOL InitHotkey(); "!UVs+)]  
BOOL UnInit(); R;}22s  
#endif XFqJ 'R  
=A!S/;z>  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. [aqu }Su  
#include "stdafx.h" ,/,9j{|"j  
#include "hook.h" 39TT{>?`w  
#include <windowsx.h> O'DW5hBL0  
#ifdef _DEBUG lU2c_4  
#define new DEBUG_NEW rrBAQY|.  
#undef THIS_FILE KMK`F{  
static char THIS_FILE[] = __FILE__; 7^:4A'  
#endif E]} n(  
#define MAX_KEY 100 A74920X`W  
#define CTRLBIT 0x04 ,|T7hTn=  
#define ALTBIT 0x02 -yx/7B5@  
#define SHIFTBIT 0x01 nU z7|y  
#pragma data_seg("shareddata") g:#d l\k  
HHOOK hHook =NULL; !<\Br  
UINT nHookCount =0; v"Jgw;3  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey W WG /k17  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT pW?& J>\6  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey }_OM$nzj  
static int KeyCount =0; fI|[Z+"  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift *nTU# U  
#pragma data_seg() 8im@4A+n`  
HINSTANCE hins; /VTM 9)u  
void VerifyWindow(); y 'M#z_.z  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ANMg  
//{{AFX_MSG_MAP(CHookApp) ~H /2R  
// NOTE - the ClassWizard will add and remove mapping macros here. \h{r;#g  
// DO NOT EDIT what you see in these blocks of generated code! |M~ON=  
//}}AFX_MSG_MAP %y`7);.q  
END_MESSAGE_MAP() >_ \<E!j  
LM l~yqM  
CHookApp::CHookApp() =y]$0nh  
{ 8;\sU?  
 // TODO: add construction code here, -_^c6!i  
 // Place all significant initialization in InitInstance mY&ud>,U:  
} u<tk G B  
; y.E!  
CHookApp theApp; _}Ps(_5D  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) oQ2KW..q  
{ <:;^'x>!  
 BOOL bProcessed=FALSE; -w 6 "?  
 if(HC_ACTION==nCode) mDMt5(.   
 { 4&X*pL2;  
  if((lParam&0xc0000000)==0xc0000000){// Key up g /+oZU  
   switch(wParam) WE!vSZ3R  
   { Ca>&  
    case VK_MENU: vK'?:}~  
     MaskBits&=~ALTBIT; ]<w:V`(  
     break; 5\4g>5PD  
    case VK_CONTROL: =hH.zrI6e  
     MaskBits&=~CTRLBIT; !.X.tc  
     break; )@g;j>  
    case VK_SHIFT: 2XSHZ|;  
     MaskBits&=~SHIFTBIT; zY9 H%  
     break; 0Bolv_e  
    default: //judge the key and send message XSRdqU>Aun  
     break; X" R<J#4  
   } mxG]kqi  
   for(int index=0;index<MAX_KEY;index++){ 9@VO+E$7L  
    if(hCallWnd[index]==NULL) 3.R#&Zxt  
     continue; NX6nQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ' [0AHM  
    { d]v+mVAyE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); /Wj,1WX~  
     bProcessed=TRUE; I=Zx"'Um  
    } i76 Yo5  
   } -pb&-@Hul  
  } %!j:fJ()  
  else if((lParam&0xc000ffff)==1){ //Key down #;tT8[Ewuw  
   switch(wParam) Bx~[F  
   { Ubz"rCjq  
    case VK_MENU: %b!-~ Y.  
     MaskBits|=ALTBIT; 2z0n<`  
     break; O}ejWP8>  
    case VK_CONTROL: ) M<vAUF  
     MaskBits|=CTRLBIT; VHUW]8We  
     break; Z@rN_WXx  
    case VK_SHIFT: u=l1s1>  
     MaskBits|=SHIFTBIT; ?w&SW{ I  
     break; /X8 <C=}  
    default: //judge the key and send message 7,$z;Lr0S  
     break; |QZ 58)>  
   } ' P"g\;Ij  
   for(int index=0;index<MAX_KEY;index++) zsl,,gk9Y  
   { aw $L$7b}  
    if(hCallWnd[index]==NULL) fZWGn6$   
     continue; rXi uwz\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) TCVl8)j  
    { '?*g%Yuz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); j -O2aL  
     bProcessed=TRUE; Kp iF0K  
    } = bt]JRU  
   } >`T5]_a  
  } ]dPZ.r  
  if(!bProcessed){ p='-\M74K  
   for(int index=0;index<MAX_KEY;index++){ hsLzj\)6  
    if(hCallWnd[index]==NULL) hP@(6X,"  
     continue; wo^Sy41bF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) b3$k9dmxV+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); T3&`<%,f  
   } /\d$/~BFi  
  } SS.jL)  
 } Y}R}-+bD/  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); E_ucab-Fi  
} |Rzy8j*  
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BOOL InitHotkey() T~8  .9g  
{ g=)J~1&p  
 if(hHook!=NULL){ <g2_6C\j  
  nHookCount++; % g"eV4 j  
  return TRUE; mry N}  
 }  $6>?;  
 else L):qu  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); LxN*)[Wb  
  if(hHook!=NULL) y6HuN  
   nHookCount++; Bstk{&ew  
  return (hHook!=NULL); w5C*L)l  
} BNGe exs@  
BOOL UnInit() 3ha|0[r9  
{ -\$`i c$"1  
 if(nHookCount>1){ Kf,-4)  
  nHookCount--; _sHK*&W{CT  
  return TRUE; dWRrG-'  
 } KU&G;ni2  
 BOOL unhooked = UnhookWindowsHookEx(hHook); _Tm0x>EM  
 if(unhooked==TRUE){ $A\m>*@  
  nHookCount=0; "E!mva*NU  
  hHook=NULL; N1EezC'^  
 } f`<FT'A  
 return unhooked; M@UVpQwgv  
} l0]d  
-f(/B9}  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) x<(b|2qf  
{ $\Lyi#<  
 BOOL bAdded=FALSE; m@xi0t  
 for(int index=0;index<MAX_KEY;index++){ oUDVy_k  
  if(hCallWnd[index]==0){ V2&^!#=s  
   hCallWnd[index]=hWnd; dG'SZ&<  
   HotKey[index]=cKey; 7LZ^QC  
   HotKeyMask[index]=cMask; (il0M=M  
   bAdded=TRUE; tOdT[&  
   KeyCount++; qztV,R T  
   break; > 6CV4 L  
  } !3&kQpF  
 } 8|1^|B(l  
 return bAdded; 8s}J!/2  
} zi]%Zp  
jh ez  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .q`{Dgc~  
{ #G^A-yjn  
 BOOL bRemoved=FALSE; VkmRh,T  
 for(int index=0;index<MAX_KEY;index++){ D@Da0  
  if(hCallWnd[index]==hWnd){ J@"utY6N  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Xg<[fwW  
    hCallWnd[index]=NULL; ~fN%WZ;_  
    HotKey[index]=0; UV7%4xM5v  
    HotKeyMask[index]=0; "u^EleE!  
    bRemoved=TRUE; m$Y :0_^-  
    KeyCount--; Qu*1g(el!o  
    break; _cI_#  
   } |(IO=V4P  
  } 0OZMlt%z  
 } LC69td&  
 return bRemoved; w:=V@-S 8  
} (-yl|NFBw  
[W,|kDK  
void VerifyWindow() 3 pWM~(#>-  
{ H -t|i  
 for(int i=0;i<MAX_KEY;i++){ (yrh=6=z  
  if(hCallWnd!=NULL){ hXL|22>w<  
   if(!IsWindow(hCallWnd)){ dz9Y}\2tf  
    hCallWnd=NULL; g$37;d3Tx  
    HotKey=0; GY!C|7kN  
    HotKeyMask=0; h^|5|l  
    KeyCount--; z5cYyx r>  
   }  .jg0a  
  } j.?:Gaab?#  
 } w_-+o^  
} 2OBfHO~D  
m9$:9yRm  
BOOL CHookApp::InitInstance() D9ufoa&ua  
{ cSD{$B:  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 93%{scrm  
 hins=AfxGetInstanceHandle(); LgqGVh3\s  
 InitHotkey(); 3!9 Z=- tD  
 return CWinApp::InitInstance(); ^JeMuU  
} h BMH)aU  
eQN.sl5  
int CHookApp::ExitInstance() AHh#Fx+K  
{ a' FN 3  
 VerifyWindow(); n2-0.Er  
 UnInit(); ~hX-u8Ul'N  
 return CWinApp::ExitInstance(); ; 2`sN   
} }7/e8 O2  
UGKaOol.  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ]?l{j  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Q\_{d0 0  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ @"87F{!  
#if _MSC_VER > 1000 *YV S|6bs  
#pragma once fv'4f$U  
#endif // _MSC_VER > 1000 85Y|CN] vQ  
X)Gp7k1w  
class CCaptureDlg : public CDialog Ww9;UP'G  
{ j BS4vvX?  
 // Construction .(Y6$[#@  
 public: XX;6 P  
  BOOL bTray; Opg#*w%-  
  BOOL bRegistered; [ = M%  
  BOOL RegisterHotkey(); |7F*MP  
  UCHAR cKey; ur%$aX)  
  UCHAR cMask; :b#%C pR  
  void DeleteIcon(); S3 \jcgrS  
  void AddIcon(); Epjff@ 7A  
  UINT nCount; aq>?vti1D  
  void SaveBmp(); 4MvC]_&  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Ej(2w Q  
  // Dialog Data n'w,n1z7  
  //{{AFX_DATA(CCaptureDlg) @'jf KW  
  enum { IDD = IDD_CAPTURE_DIALOG }; 5G*II_j  
  CComboBox m_Key; :hqZPajE  
  BOOL m_bControl; V0i9DK|!  
  BOOL m_bAlt; hl/itSl$  
  BOOL m_bShift; a|qsQ'1,;  
  CString m_Path; :{}_|]>K  
  CString m_Number; .KA V)So"  
  //}}AFX_DATA  M[P^]J@  
  // ClassWizard generated virtual function overrides POd/+e9d  
  //{{AFX_VIRTUAL(CCaptureDlg) M}FWBs'*|  
 public: 05e>\}{0  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 1"E\C/c  
 protected: F+aQ $pQ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ! q6hC  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); `lCuU~~ag  
  //}}AFX_VIRTUAL 4br6$  
  // Implementation U6j/BJT"  
 protected: ^X1wI9V  
  HICON m_hIcon; v<h;Di@  
  // Generated message map functions  W'/>et  
  //{{AFX_MSG(CCaptureDlg) L]bVN)JU  
  virtual BOOL OnInitDialog(); .]t5q%}j  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 4O$2]D.\  
  afx_msg void OnPaint(); v|@1(  
  afx_msg HCURSOR OnQueryDragIcon(); ;iX<`re~  
  virtual void OnCancel(); YMB~[]$V<  
  afx_msg void OnAbout(); /&s}<BMHU  
  afx_msg void OnBrowse(); Y`li> .\  
  afx_msg void OnChange(); >)Dhi+D  
 //}}AFX_MSG otriif@+Z  
 DECLARE_MESSAGE_MAP() zB)%lb  
}; >{&A%b4JF  
#endif VWa|Y@Dc]  
4F#%f#"  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `iYc<N`  
#include "stdafx.h" :t$A8+A+0  
#include "Capture.h" 'EX4.h a5  
#include "CaptureDlg.h" tY_5Pz(@  
#include <windowsx.h> 3 N%{B  
#pragma comment(lib,"hook.lib") (_8#YyW#  
#ifdef _DEBUG f1cl';  
#define new DEBUG_NEW `BT^a =5  
#undef THIS_FILE  )U98  
static char THIS_FILE[] = __FILE__; aqL<v94wX  
#endif YKx 1NC  
#define IDM_SHELL WM_USER+1 Jt=>-Spj  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); g9V.13k  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5' \)`  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Y3o Mh,  
class CAboutDlg : public CDialog i?>Hr|  
{ *\q8BZ  
 public: rg)h 5G  
  CAboutDlg(); AzjMv6N   
  // Dialog Data e-6(F4  
  //{{AFX_DATA(CAboutDlg) [m#NfA:h,  
  enum { IDD = IDD_ABOUTBOX }; xs1bxJ_R  
  //}}AFX_DATA j%xBo:  
  // ClassWizard generated virtual function overrides Bw-s6MS  
  //{{AFX_VIRTUAL(CAboutDlg) K2|7%  
 protected: &oN/_7y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *{[d%B<lp  
  //}}AFX_VIRTUAL b(&] >z  
  // Implementation xrI}3T  
 protected: -Bv 12ymLG  
  //{{AFX_MSG(CAboutDlg) yYX :huw  
  //}}AFX_MSG <Cq"| A  
  DECLARE_MESSAGE_MAP() Z<]VTo  
}; BjZ>hhs!*  
\R Z3Hh  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) y4<+-  
{ qS]G&l6QF  
 //{{AFX_DATA_INIT(CAboutDlg) (#u{ U=  
 //}}AFX_DATA_INIT ,+-h7^{`  
} G8P+A1 f/>  
WOb8 "*OM  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) # #>a&,  
{ ptR  
 CDialog::DoDataExchange(pDX); 2PBepgQyPU  
 //{{AFX_DATA_MAP(CAboutDlg) 2f{kBD  
 //}}AFX_DATA_MAP <.$,`m,  
} ;,`]O!G:P  
s`vSt* ]K  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) {PmzkT}LF  
 //{{AFX_MSG_MAP(CAboutDlg) %!wq:~B1  
 // No message handlers 04\Ta  
 //}}AFX_MSG_MAP ..$>7y}  
END_MESSAGE_MAP() a7 )@BzF#  
LDX y}hm)  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?N _)>&b  
: CDialog(CCaptureDlg::IDD, pParent)  T{Hf P  
{ Oga1u  
 //{{AFX_DATA_INIT(CCaptureDlg) ,\>g  
  m_bControl = FALSE; n)CH^WHL&  
  m_bAlt = FALSE; 88YC0!Ni  
  m_bShift = FALSE; _LsYMUe  
  m_Path = _T("c:\\"); BvJ\x)  
  m_Number = _T("0 picture captured."); ^0eO\wc?O  
  nCount=0; ybYXD?  
  bRegistered=FALSE; am (#Fa  
  bTray=FALSE; J/[7d?hI/  
 //}}AFX_DATA_INIT .b~OMTHuvM  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Zh? V,39  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); .h6Y< E  
} wRi~Yb?  
[oJ& J>U'  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) JU2P%3  
{ VO|u8Z"  
 CDialog::DoDataExchange(pDX); |VYr=hjo  
 //{{AFX_DATA_MAP(CCaptureDlg) I1v@\Rb  
  DDX_Control(pDX, IDC_KEY, m_Key); NYwGK|  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); w(#:PsMo<  
  DDX_Check(pDX, IDC_ALT, m_bAlt); GZ,j?@  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); )u Qvt-  
  DDX_Text(pDX, IDC_PATH, m_Path); ChVY Vx(  
  DDX_Text(pDX, IDC_NUMBER, m_Number); i6A$1(:h  
 //}}AFX_DATA_MAP oVreP  
} 8x gc[#  
!xH,y  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) n4R]+&*  
//{{AFX_MSG_MAP(CCaptureDlg) b<\GI 7  
 ON_WM_SYSCOMMAND() M;PlSb  
 ON_WM_PAINT() ~QO< B2hS}  
 ON_WM_QUERYDRAGICON() . Nk6  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) *V<)p%l.  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) F]0Jwm{  
 ON_BN_CLICKED(ID_CHANGE, OnChange) WS5"!vz   
//}}AFX_MSG_MAP - BjEL;  
END_MESSAGE_MAP() /rOnm=P+Q  
6ku8`WyoF  
BOOL CCaptureDlg::OnInitDialog() d}pGeU'  
{ d4V 2[TX  
 CDialog::OnInitDialog(); "d:.*2Z2  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); P 4H*jy@?  
 ASSERT(IDM_ABOUTBOX < 0xF000); `43vxcMg  
 CMenu* pSysMenu = GetSystemMenu(FALSE); uzO {{S-  
 if (pSysMenu != NULL) % dYI5U89  
 { b sMC#xT  
  CString strAboutMenu; |&(H^<+Xp  
  strAboutMenu.LoadString(IDS_ABOUTBOX); o KlF5I  
  if (!strAboutMenu.IsEmpty()) Qw}xGlF,  
  { ko>M&/^  
   pSysMenu->AppendMenu(MF_SEPARATOR); E4hq}  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); XWc|[>iO  
  } 69-$Wn43<  
 } y^, "gD  
 SetIcon(m_hIcon, TRUE); // Set big icon '&/(oJ ;O~  
 SetIcon(m_hIcon, FALSE); // Set small icon EO"=\C,  
 m_Key.SetCurSel(0); Px$'(eMj^3  
 RegisterHotkey(); ud.poh~|  
 CMenu* pMenu=GetSystemMenu(FALSE); ItMl4P`|  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); .^BWR  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 01-p `H+  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Q.<giBh  
 return TRUE; // return TRUE unless you set the focus to a control D8a)(wm  
} 5#P: "U  
#%qqL  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Hc>([?P%t  
{ <%he  o  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) rT o%=0P  
 { 1X Q87~  
  CAboutDlg dlgAbout; YBR)s\*  
  dlgAbout.DoModal(); gca|?tt  
 } s!bHS_\e|  
 else RLv&,$$0  
 { rnJS[o0  
  CDialog::OnSysCommand(nID, lParam); 7%W!k zp>  
 } zkH<aLRB  
} EWSr@}2j .  
ws#hhW3qK  
void CCaptureDlg::OnPaint() T3 =)F%  
{ o:h)~[n|  
 if (IsIconic()) XL=2wh  
 { Dy98[cL  
  CPaintDC dc(this); // device context for painting b$IY2W<Ln  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); UnJi& ~O  
  // Center icon in client rectangle Ua}g  
  int cxIcon = GetSystemMetrics(SM_CXICON); K@I+]5E%?  
  int cyIcon = GetSystemMetrics(SM_CYICON); #@IQlqJfY7  
  CRect rect; n (9F:N  
  GetClientRect(&rect); Lqg7D\7j  
  int x = (rect.Width() - cxIcon + 1) / 2; w6%l8+{R  
  int y = (rect.Height() - cyIcon + 1) / 2; OX'/?B((  
  // Draw the icon qdKh6{  
  dc.DrawIcon(x, y, m_hIcon); 7&#'c8]/qh  
 } Ty)gPh6O  
 else ]eY Qio!  
 { 5L/Yi  
  CDialog::OnPaint(); Q,ZkeWQ7%  
 } R/yPZO-U  
} =#7s+d-  
C,V|TF.i2  
HCURSOR CCaptureDlg::OnQueryDragIcon() )tJL@Qo  
{ Kv(Y }  
 return (HCURSOR) m_hIcon; 3xc:Y> *`  
} 0^-z?Kb<}  
mm3zQ!2j.  
void CCaptureDlg::OnCancel() =9#i<te  
{ @oUf}rMiDa  
 if(bTray) Lx9hq7<  
  DeleteIcon(); ,oy4V^B&  
  CDialog::OnCancel(); T[`QO`\5O  
} #1gTpb+t  
9 ?EY.}~  
void CCaptureDlg::OnAbout() LPtx|Sx![  
{ +# m   
 CAboutDlg dlg; ;Of?fe5:  
 dlg.DoModal(); P1M|f4*  
} +:j4G^V  
fo/(()  
void CCaptureDlg::OnBrowse() qg/Y;tGSx  
{ pmE1EDPag  
 CString str; x'VeL|  
 BROWSEINFO bi; r%O rH-T  
 char name[MAX_PATH]; uOy\{5s8  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); }s8*QfK>  
 bi.hwndOwner=GetSafeHwnd(); g;| n8]  
 bi.pszDisplayName=name; N9~'P-V  
 bi.lpszTitle="Select folder"; {FrHm  
 bi.ulFlags=BIF_RETURNONLYFSDIRS;  ."$=  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); BN bb&]  
 if(idl==NULL) UFSEobhg&5  
  return; O :5ldI  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); rElG7[+)p  
 str.ReleaseBuffer(); F 5b]/;|  
 m_Path=str; LGdf_M-f  
 if(str.GetAt(str.GetLength()-1)!='\\') 0~LnnD N  
  m_Path+="\\"; &q kl*#]  
 UpdateData(FALSE); wpPxEp/  
} FuRn%)DA5  
>rQ)|W=i  
void CCaptureDlg::SaveBmp() [C*X k{e  
{ G>?x-!9qcH  
 CDC dc; Pj^k pjV  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ~8S4Kj)%  
 CBitmap bm; ]kU~#WT  
 int Width=GetSystemMetrics(SM_CXSCREEN); y"{UN M|R  
 int Height=GetSystemMetrics(SM_CYSCREEN); < :S?t2C  
 bm.CreateCompatibleBitmap(&dc,Width,Height); r)*_,Fo|  
 CDC tdc; 3@#,i<ge:  
 tdc.CreateCompatibleDC(&dc); -0[>}!l=G  
 CBitmap*pOld=tdc.SelectObject(&bm); n~L'icD[  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); [xH2n\7  
 tdc.SelectObject(pOld); IWSEssP  
 BITMAP btm; m"k i*9]  
 bm.GetBitmap(&btm); 2g`uC}  
 DWORD size=btm.bmWidthBytes*btm.bmHeight;  @=^jpSnZ  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); vCrWA-q#  
 BITMAPINFOHEADER bih; vM$#m1L?  
 bih.biBitCount=btm.bmBitsPixel; LQuYCfj|  
 bih.biClrImportant=0; o>!~*b';g,  
 bih.biClrUsed=0; 9 ;! uV>-H  
 bih.biCompression=0; ** "s~  
 bih.biHeight=btm.bmHeight; W"DxIy  
 bih.biPlanes=1; JN9HT0  
 bih.biSize=sizeof(BITMAPINFOHEADER); lVO(9sl*i  
 bih.biSizeImage=size; G+%5V5GS  
 bih.biWidth=btm.bmWidth; a-o hS=W  
 bih.biXPelsPerMeter=0; 'SXpb?CZ  
 bih.biYPelsPerMeter=0; ^!{ oAzy9  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); A*?/F:E  
 static int filecount=0; &vGEz*F  
 CString name; o7Z#,>`2  
 name.Format("pict%04d.bmp",filecount++); 2R~=@  
 name=m_Path+name; 0bRkC,N (  
 BITMAPFILEHEADER bfh; q, 19NZ  
 bfh.bfReserved1=bfh.bfReserved2=0; |R|U z`  
 bfh.bfType=((WORD)('M'<< 8)|'B'); YQw/[  
 bfh.bfSize=54+size; LP-KD  
 bfh.bfOffBits=54; (*@~HF,t=  
 CFile bf; HEW9YC"  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ VA*79I#_q  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); zke~!"iq  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); +P<w<GfQ  
  bf.WriteHuge(lpData,size); Jh hT7\h(  
  bf.Close(); )r-|T&Sn  
  nCount++; ~`Gcq"7, !  
 } pR^Y|NG!  
 GlobalFreePtr(lpData); M@z_Z+q 9  
 if(nCount==1) fuwpp  
  m_Number.Format("%d picture captured.",nCount); "!4>gg3r  
 else Toa#>Z*+Rb  
  m_Number.Format("%d pictures captured.",nCount); 0DP%44Cv9  
  UpdateData(FALSE); Ag hj)V  
} f1,$<Y|qU  
_yXeX  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) &t@6qi`d  
{ 8aIq#v  
 if(pMsg -> message == WM_KEYDOWN) jL[Is2<@  
 { ;Bc<u[G  
  if(pMsg -> wParam == VK_ESCAPE) 9 h{:!  
   return TRUE; "$wPq@  
  if(pMsg -> wParam == VK_RETURN) r z>zdj5}  
   return TRUE; Y+5A2Z)f[  
 } pOe`*2[  
 return CDialog::PreTranslateMessage(pMsg); Eo3Aak o  
} D -\'P31  
A0 w `o  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (2a "W`  
{ bm]dz;ljh  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ qCFXaj   
  SaveBmp(); "Z1&z-   
  return FALSE; >ehWjL`8  
} }sN9QgE  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ %0M^  
 CMenu pop; j7| \)x,  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); uvc{RP  
 CMenu*pMenu=pop.GetSubMenu(0); <38@b ]+  
 pMenu->SetDefaultItem(ID_EXITICON); 7ump:|  
 CPoint pt; #j ~FA3O  
 GetCursorPos(&pt); QR-R5XNT[  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); s%?p%2&RA  
 if(id==ID_EXITICON) jnLo[Cf,H8  
  DeleteIcon(); 'V1 -iJj9  
 else if(id==ID_EXIT) UHDI9>G~,  
  OnCancel(); u:>3j,Cs  
 return FALSE; yqc(32rF!  
} 9/qS*Zdh)  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); uL{~(?U$  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ?@ye*%w_  
 AddIcon(); 1RO gUJ;  
 return res; >Ki]8 &  
} \/dm}' `  
ur quVb  
void CCaptureDlg::AddIcon() &+|4(d1  
{ 5 WNRo[`7  
 NOTIFYICONDATA data; }\qdow-  
 data.cbSize=sizeof(NOTIFYICONDATA); &JQ@(w  
 CString tip; %<o$ J~l~  
 tip.LoadString(IDS_ICONTIP); ezy5Jqk5%  
 data.hIcon=GetIcon(0); K*i1! "w  
 data.hWnd=GetSafeHwnd(); [LEh  
 strcpy(data.szTip,tip); Hbj:CViYq  
 data.uCallbackMessage=IDM_SHELL; #YMp,i  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <$Kv^Y*  
 data.uID=98; \EfwS% P  
 Shell_NotifyIcon(NIM_ADD,&data); |@9I5Eg)iE  
 ShowWindow(SW_HIDE); &@Gu~)^(  
 bTray=TRUE; m.g@S30  
} vpw&"?T  
"+ JwS  
void CCaptureDlg::DeleteIcon() 5x'y{S<  
{ 9%k.GE  
 NOTIFYICONDATA data; OU5|m%CmO  
 data.cbSize=sizeof(NOTIFYICONDATA); P!&CH4+  
 data.hWnd=GetSafeHwnd(); :^L]Da3  
 data.uID=98; F!cAaL1  
 Shell_NotifyIcon(NIM_DELETE,&data); 8q LgB  
 ShowWindow(SW_SHOW); av$_hEjo|D  
 SetForegroundWindow(); J^a"1|  
 ShowWindow(SW_SHOWNORMAL); "jJ)hk5e  
 bTray=FALSE; ])l[tVHm  
} sN) .Jo  
g#2X'%&+  
void CCaptureDlg::OnChange() 3jVm[c5%]  
{ )'CEWc%  
 RegisterHotkey(); !>);}J!e]  
} 5K-)X9z?  
) CTM  
BOOL CCaptureDlg::RegisterHotkey() ]<?)(xz  
{ 1KR|i"  
 UpdateData(); &>b1ES.>  
 UCHAR mask=0; xa*gQ%+F  
 UCHAR key=0; ^W05Z!}  
 if(m_bControl) )GKgK;=~  
  mask|=4; s;M*5|-  
 if(m_bAlt) {mitF  
  mask|=2; BfLZ  
 if(m_bShift) qiryC7.E  
  mask|=1; 0-~x[\>>  
  key=Key_Table[m_Key.GetCurSel()]; [$Bb'],k  
 if(bRegistered){ ll09j Ef  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); (`Mz.VN  
  bRegistered=FALSE; ?YykCJJ ~@  
 } +E[)@;T  
 cMask=mask; w[G_w:$a  
 cKey=key; )t=u(:u]  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); WYzaD}  
 return bRegistered; fb;"J+  
} |;-r};  
L2$L.@  
  四、小结 sYP@>tHC  
MW>28  
  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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