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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: a C\MJ9  
  {CGUL|y  
  一、实现方法 @v)p<r^M">  
nz=G lO'[  
  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: S79;^X  
Ki$MpA3j   
#pragma data_seg("shareddata") &-Gqdnc  
HHOOK hHook =NULL; //钩子句柄 Pama#6?OPh  
UINT nHookCount =0; //挂接的程序数目 SBfT20z[  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 yDegcAn?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 f=r<nb'H  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey -~v2BN/  
static int KeyCount =0; %4,O 2\0?&  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 pm 9"4z  
#pragma data_seg() F`XP@Xx  
9CWF{"  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 zck#tht4 n  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 1AM!8VR2  
*U,@q4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR :*Z4yx  
cKey,UCHAR cMask) x7!L{(E3  
{ %\dz m-d(C  
 BOOL bAdded=FALSE; d"*uBVzXm  
 for(int index=0;index<MAX_KEY;index++){ }Mp:JPH&S4  
  if(hCallWnd[index]==0){ t!W(_8j  
   hCallWnd[index]=hWnd; F@'Jbd`   
   HotKey[index]=cKey; 1Z+8r  
   HotKeyMask[index]=cMask; W14 J],{L  
   bAdded=TRUE; 9=8iy w  
   KeyCount++; lhAX;s&9  
   break; t\~P:"  
  } |y!=J$ $_H  
 } /v1Q4mq  
 return bAdded; CY s,`  
} fzb29 -  
//删除热键 93("oBd[s(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [65 `$x-  
{ ~962i#&4  
 BOOL bRemoved=FALSE; ao1(]64X"  
 for(int index=0;index<MAX_KEY;index++){ 8*#R]9  
  if(hCallWnd[index]==hWnd){ s%nUaWp~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %et } A93  
    hCallWnd[index]=NULL; .oYl-.E>&  
    HotKey[index]=0; ?(D q?-.  
    HotKeyMask[index]=0; VM GS[qrG  
    bRemoved=TRUE; - D  
    KeyCount--; !;Yg/'vD-  
    break; cl=EA6P\X  
   } aQ?/%\>  
  } \r^qL^  
 } }Gz~nf%  
 return bRemoved; B}Z63|/N  
} MDhRR*CBh  
|:q=T ~x  
v7BA[jQr  
  DLL中的钩子函数如下: D[aCsaR  
}Z@ovsG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9ifDcYl  
{ ~dgDO:)  
 BOOL bProcessed=FALSE; ?I_s0k I  
 if(HC_ACTION==nCode) %GjM(;Tk  
 { p{amC ;cI$  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 =9'RM>  
   switch(wParam) z&#SPH*  
   {  8uc1iB  
    case VK_MENU: +Mo9kC  
     MaskBits&=~ALTBIT; ov ` h  
     break; p Dx1z|@z  
    case VK_CONTROL: &=Ar  
     MaskBits&=~CTRLBIT; :mh_G  
     break; m4hX 'F  
    case VK_SHIFT: E4`N-3  
     MaskBits&=~SHIFTBIT; ]/[FR5>  
     break; m[? E  
    default: //judge the key and send message |oH,   
     break; J*yf2&lI5  
   } N..yQ-6x?  
   for(int index=0;index<MAX_KEY;index++){ &zl|87M  
    if(hCallWnd[index]==NULL) 5{|7$VqPF  
     continue; gf#{k2r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -Br Mp%C  
    { d A@]!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `18qbot  
     bProcessed=TRUE; [;4 g  
    } GY6`JWk  
   } nt 81Bk=  
  } ?*[N_'2W+  
  else if((lParam&0xc000ffff)==1){ //有键按下 1-%fo~!l  
   switch(wParam) a,@]8r-"  
   { ~("5y G  
    case VK_MENU: YIn',]p:  
     MaskBits|=ALTBIT; *xx'@e|<;  
     break; X[*<NN  
    case VK_CONTROL: 0Is,*Srr  
     MaskBits|=CTRLBIT; <C1H36p  
     break; C]O(T2l{l  
    case VK_SHIFT: >BR(Wd.  
     MaskBits|=SHIFTBIT; oX#Q<2z*  
     break; `slL %j^"  
    default: //judge the key and send message Hu\B"fdS  
     break; UldXYtGe  
   } 2 Wt> Mi  
   for(int index=0;index<MAX_KEY;index++){ O,+1<.;+  
    if(hCallWnd[index]==NULL) $? m9")  
     continue; rXmn7;B}g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9oyE$S h]  
    { Jj>?GAir  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); NO7J!k?  
     bProcessed=TRUE; V/%>4GYnC  
    } oibsh(J3  
   } oI0M%/aM  
  } G"-?&)M#a  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 (7mAt3n k  
   for(int index=0;index<MAX_KEY;index++){ !POl;%\  
    if(hCallWnd[index]==NULL) iqC|G/  
     continue; _7Rr=_1}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `> 7; !  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); chcbd y>C  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 14Xqn8uOW  
   } dT`D:)*:  
  } 6CV* Z\b  
 } |jQ:~2U|   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); =}lh_  
} 3AHlSX  
5m*iE*+  
  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: WQ~;;.v#  
<Y*+|T+&d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :=}US}H$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `>gd&u  
K$&s=Hm  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: k52/w)Ro,$  
)bS~1n_0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) wF IegC(  
{ Sc>,lIM  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) S'|,oUWDb  
 { ?zeJ#i  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ^WHE$4U`  
  SaveBmp(); o>).Cj  
  return FALSE; @E;=*9ek{u  
 } RTvqCp  
 …… //其它处理及默认处理 HTVuStM8  
} *i\Qo  
D N'3QQn  
na#CpS;pc  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 qIVx9jNN  
8qY79)vD4E  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 %b%-Ogz;4  
vL|SY_:4  
  二、编程步骤 Keuf9u  
di?K"Z>  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; G^~k)6v=m  
x^HGVWw_  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; D2<fw#  
^"VJd[Hn  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; W}3.E "K  
"8c@sHk(w  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; "w^!/  
xe#FUS 3  
  5、 添加代码,编译运行程序。 yyoqX"v[  
nc~F_i=  
三、程序代码 ~rlB'8j(  
~?D4[D|sB  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 9)y/:sO<P  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) _76PIR{an  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ yL%K4$z  
#if _MSC_VER > 1000 y-T| #  
#pragma once ^M3~^lV  
#endif // _MSC_VER > 1000 )` SE S."  
#ifndef __AFXWIN_H__ r#+d&.|  
#error include 'stdafx.h' before including this file for PCH zAK+8{,  
#endif {!.(7wV\  
#include "resource.h" // main symbols VO,!x~S!  
class CHookApp : public CWinApp RS"H8P 4W  
{ e>7]w,*|  
 public: u}>#Eb  
  CHookApp(); |S_T^'<W  
  // Overrides 2VF%@p  
  // ClassWizard generated virtual function overrides B268e  
  //{{AFX_VIRTUAL(CHookApp) FYOD Upn  
 public: ^@ I   
  virtual BOOL InitInstance(); pM^9c7@!:  
  virtual int ExitInstance(); Y&[1`:-~-  
  //}}AFX_VIRTUAL ~res V  
  //{{AFX_MSG(CHookApp) <A<{,:5C  
  // NOTE - the ClassWizard will add and remove member functions here. (hTCK8HK  
  // DO NOT EDIT what you see in these blocks of generated code ! x4g3 rmp  
  //}}AFX_MSG NS9B[*"Jl  
  DECLARE_MESSAGE_MAP()  :l~ I  
}; <:(6EKJAq}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); dA-2%uJ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); nIAx2dh?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8yRJD[/S  
BOOL InitHotkey(); r>dwDBE  
BOOL UnInit(); 6Se?sHC>  
#endif fXXr+Mor  
* "R|4"uy  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 2Gz}T _e  
#include "stdafx.h" * 1T&  
#include "hook.h" - |kA)M[  
#include <windowsx.h> TK5K_V*7  
#ifdef _DEBUG vbkI^+=,YY  
#define new DEBUG_NEW z3`-plE  
#undef THIS_FILE I'\kFjc  
static char THIS_FILE[] = __FILE__; QZ4v/Ou  
#endif F|F]970  
#define MAX_KEY 100 $i&e[O7T;  
#define CTRLBIT 0x04 L=c!:p|7)  
#define ALTBIT 0x02 4A@NxihH  
#define SHIFTBIT 0x01 3j,Q`+l/6d  
#pragma data_seg("shareddata") A54N\x,  
HHOOK hHook =NULL; Dakoqke  
UINT nHookCount =0; V7GRA#|  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey flk=>h|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT rJPb 3F  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey K2 he4<  
static int KeyCount =0; 6^%UU o%  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift LL]zT H0  
#pragma data_seg() @WJg WJm  
HINSTANCE hins; /nyUG^5#{  
void VerifyWindow(); 4S,`bnmB  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ^cV;~&|.Xk  
//{{AFX_MSG_MAP(CHookApp) $>*3/H  
// NOTE - the ClassWizard will add and remove mapping macros here. _Bj)r}~7#  
// DO NOT EDIT what you see in these blocks of generated code! `o<' x.I  
//}}AFX_MSG_MAP =2[7 E  
END_MESSAGE_MAP() >QA uEM  
)_1zRT|9  
CHookApp::CHookApp() =2Bg9!zW>  
{ JQ}$Aqk  
 // TODO: add construction code here, dODt(J}%  
 // Place all significant initialization in InitInstance #@^t;)|  
} Z= jr-)kK  
g$( V^  
CHookApp theApp; qi;f^9M%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) OH;b"]  
{ I*LknU@  
 BOOL bProcessed=FALSE; k:*S&$S!E  
 if(HC_ACTION==nCode) dArDP[w  
 { RD\  
  if((lParam&0xc0000000)==0xc0000000){// Key up km)zMoE{c{  
   switch(wParam) zfI>qJ+Nqt  
   { +cIUGF p}  
    case VK_MENU: k9)jjR*XxG  
     MaskBits&=~ALTBIT; 6Pnk5ps }h  
     break; < XP9@t&  
    case VK_CONTROL: 'pm2n0  
     MaskBits&=~CTRLBIT; m6n?bEl6I  
     break; wm]^3q I2  
    case VK_SHIFT: MG[o%I96  
     MaskBits&=~SHIFTBIT; Ne#WI'  
     break; $P>`m$(8  
    default: //judge the key and send message ${+ @gJ+S  
     break; cU0s p  
   } 9[1`jtm  
   for(int index=0;index<MAX_KEY;index++){ 3mYiQ2  
    if(hCallWnd[index]==NULL) gfsI6/Y  
     continue; 5V5%/FU m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) TftHwe):V  
    { L~(_x"uXd  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ae69>bkE0  
     bProcessed=TRUE; r;>*_Oc7g  
    } $}lbT15a  
   } kHXL8k#T  
  } SfgU`eF%B  
  else if((lParam&0xc000ffff)==1){ //Key down ! vP[;6  
   switch(wParam) C3< m7h  
   { 8i6Ps$T  
    case VK_MENU: v[#9+6P=  
     MaskBits|=ALTBIT; hfnN@Kg?B}  
     break; _$= _du  
    case VK_CONTROL: {S,l_d+(  
     MaskBits|=CTRLBIT; .7i` (F)  
     break; Uu!f,L;ty  
    case VK_SHIFT: T6H}/#*tK  
     MaskBits|=SHIFTBIT; MxSM@3v(  
     break; )ap_Z6  
    default: //judge the key and send message + ` s@  
     break; /V8}eZ97  
   } \zieyE  
   for(int index=0;index<MAX_KEY;index++) 8#(Q_  
   { V+Cwzc^j  
    if(hCallWnd[index]==NULL) /DQc&.jK  
     continue; L!=4N!j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _7IKzUn9g[  
    { )N=NR2xBZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); D<8HZ%o  
     bProcessed=TRUE; AK\$i$@6  
    } +|bmT  
   } AgV G`q  
  } >y.%xK  
  if(!bProcessed){ R&|mdY8  
   for(int index=0;index<MAX_KEY;index++){ t<~$  
    if(hCallWnd[index]==NULL) D|rFu  
     continue; dY@WI[yog  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) a["2VY6Eq@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Mr?Xp(.}G  
   } a;QMA d!  
  } Y|8:;u'  
 } JL\w_v  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 5m?8yT}  
} xqC+0{] y  
*.\  
BOOL InitHotkey() ?shIj;c[  
{ |;.o8}  
 if(hHook!=NULL){ \"CZI<=TB  
  nHookCount++; v-yde >(  
  return TRUE; }e2(T  
 } wNQ*t-K  
 else p3]_}Y D[#  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); #+$G=pS'v  
  if(hHook!=NULL) ?*?RP)V  
   nHookCount++; S/Fkw4%  
  return (hHook!=NULL); COTp  
} kGdt1N[  
BOOL UnInit() F;gx%[$GX  
{ JNkwEZhHyg  
 if(nHookCount>1){ vhsk 0$f  
  nHookCount--; A81ls#is  
  return TRUE; U+)xu>I  
 } 3 dht!7/  
 BOOL unhooked = UnhookWindowsHookEx(hHook); _<a7CCg  
 if(unhooked==TRUE){ 9uRF nzJVx  
  nHookCount=0; BT)X8>ct  
  hHook=NULL; TUHi5K  
 } wD68tG$  
 return unhooked; \[gReaI  
} {?J/c{=/P  
:4MB]v[K  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A,%C,*)Cg  
{ Hir Fl  
 BOOL bAdded=FALSE; Ga#:P F0  
 for(int index=0;index<MAX_KEY;index++){ /e]'u&a  
  if(hCallWnd[index]==0){ ,z;ky5Ct  
   hCallWnd[index]=hWnd; .k 3 '  
   HotKey[index]=cKey; 1Ab>4UhD  
   HotKeyMask[index]=cMask; C8 vOE`U,J  
   bAdded=TRUE; 4'-|UPhx  
   KeyCount++; OE4+GI.r-  
   break; ]8icBneA~'  
  } |N}P(GF  
 } H^.IY_I`U*  
 return bAdded; 6oLwfTy  
} (9<guv  
Q$:![}[(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ow0!%|fO  
{ rS4@1`/R  
 BOOL bRemoved=FALSE; vG;zJ#c  
 for(int index=0;index<MAX_KEY;index++){ _U{zMVr  
  if(hCallWnd[index]==hWnd){ W D T]!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ z I+\Oll#Q  
    hCallWnd[index]=NULL; H ,+? t  
    HotKey[index]=0; xdf82)  
    HotKeyMask[index]=0; NzU,va N  
    bRemoved=TRUE; qf=1?=l291  
    KeyCount--; O~59FuL  
    break; ,Z{d.[$  
   } dn }`i  
  } z]2]XTmWs  
 } i&vaeP25)  
 return bRemoved; v.:3"<ur}  
} uu}x@T@  
'=1KVE^Fk  
void VerifyWindow() UTf9S>HS  
{ #]#sGmW/L  
 for(int i=0;i<MAX_KEY;i++){ "TUe%o  
  if(hCallWnd!=NULL){ Kx=4~  
   if(!IsWindow(hCallWnd)){ G!Um,U/g  
    hCallWnd=NULL; 7UL qo>j  
    HotKey=0; -K rxMi  
    HotKeyMask=0; [Z~ 2  
    KeyCount--;  ;zYqsS  
   } a)S+8uU  
  } ]~6_WE8L  
 } $Bj;D=d@V  
} -s|}Rh?Y  
 qNm$Fx  
BOOL CHookApp::InitInstance() -jn WZ5.  
{ x5QaM.+=J  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); '0\@McU]  
 hins=AfxGetInstanceHandle(); : C b&v07  
 InitHotkey(); Yr w$  
 return CWinApp::InitInstance(); zfwS  
} rHf&:~   
+J{0 E  
int CHookApp::ExitInstance() ?Q-h n:F)  
{ mk3_  
 VerifyWindow(); /;tPNp{!dw  
 UnInit(); wWSdTLX  
 return CWinApp::ExitInstance(); K{ \;2M  
} `E!N9qI?t$  
"Vr[4&`  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file vk>b#%1{  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ~}!3G  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ?[& 2o|  
#if _MSC_VER > 1000 u$D*tqxG  
#pragma once (u]N  
#endif // _MSC_VER > 1000 `u.t[  
=) E,8L  
class CCaptureDlg : public CDialog *dvDap|8W  
{ 8a_[B~  
 // Construction v3GwD0 0  
 public: M @3"<[g  
  BOOL bTray; @ JvPx0  
  BOOL bRegistered; @h*fFiY&{  
  BOOL RegisterHotkey(); HLBkR>e  
  UCHAR cKey; ?%VI{[y#>  
  UCHAR cMask; Ov#=]t5  
  void DeleteIcon(); I+!:K|^  
  void AddIcon(); ?H_ LX;r  
  UINT nCount; [! 'op0  
  void SaveBmp(); #U*_1P0h  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor `Pw*_2  
  // Dialog Data `60gFVu  
  //{{AFX_DATA(CCaptureDlg) 4;HJ;0-ps  
  enum { IDD = IDD_CAPTURE_DIALOG }; dB+N\HBY  
  CComboBox m_Key; n!')wIk  
  BOOL m_bControl; 5C"QE8R o  
  BOOL m_bAlt; <5G{"U+ \  
  BOOL m_bShift; _DrJVC~6@  
  CString m_Path; =l.+,|ZH!  
  CString m_Number; [HN|\afz  
  //}}AFX_DATA D;I6Q1I  
  // ClassWizard generated virtual function overrides 0W3i()  
  //{{AFX_VIRTUAL(CCaptureDlg) >(y<0   
 public: gtYAHi  
  virtual BOOL PreTranslateMessage(MSG* pMsg); `\X+ Ud|  
 protected: 3:{yJdpg  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support U~W?s(Cy%  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ur vduE  
  //}}AFX_VIRTUAL (mtoA#X1:h  
  // Implementation s;1]tD  
 protected: S,U Pl}KF  
  HICON m_hIcon; /B5-Fx7j3  
  // Generated message map functions GZ{]0$9I'  
  //{{AFX_MSG(CCaptureDlg) ,+g&o^T  
  virtual BOOL OnInitDialog(); f50L,4,  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); $!5\E>y#  
  afx_msg void OnPaint(); bW ZbG{Y.  
  afx_msg HCURSOR OnQueryDragIcon(); W5^.-B,(K  
  virtual void OnCancel(); ~+<olss_  
  afx_msg void OnAbout(); {V1Pp;A  
  afx_msg void OnBrowse(); n!6Z]\8~$  
  afx_msg void OnChange(); '|7Woxl9  
 //}}AFX_MSG |7B!^ K  
 DECLARE_MESSAGE_MAP() c*`>9mv  
}; goJ|oi  
#endif saU]`w_Z*  
OEPa|rb  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file -k(CJ5H9  
#include "stdafx.h" sz-- 27es  
#include "Capture.h" __[xD\ES  
#include "CaptureDlg.h" PyA&ZkX>  
#include <windowsx.h> ^1Xt]T`e  
#pragma comment(lib,"hook.lib") }n7t h  
#ifdef _DEBUG bu&t'?z x!  
#define new DEBUG_NEW aF|d^  
#undef THIS_FILE `z0{S!  
static char THIS_FILE[] = __FILE__; XE3'`D !  
#endif ,Rx{yf]k  
#define IDM_SHELL WM_USER+1 ?0_7?yTR/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .bVmqR`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); IScRsxFb  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; w#N?l!5  
class CAboutDlg : public CDialog -o+74=E8[?  
{ =pA IvU  
 public: ^E6d`2w-  
  CAboutDlg(); 'a^{=+  
  // Dialog Data pG^}Xf2a  
  //{{AFX_DATA(CAboutDlg) >K# ,cxY  
  enum { IDD = IDD_ABOUTBOX }; =`Y.=RL+'n  
  //}}AFX_DATA Y~)T  
  // ClassWizard generated virtual function overrides OG3/-K8R  
  //{{AFX_VIRTUAL(CAboutDlg) q8:{Nk  
 protected: y fSM  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support WZ!WxX>zO  
  //}}AFX_VIRTUAL - O"i3>C  
  // Implementation yAL1O94  
 protected: ]NhS=3*i+  
  //{{AFX_MSG(CAboutDlg) aS|wpm)K>8  
  //}}AFX_MSG * MM[u75  
  DECLARE_MESSAGE_MAP() }X;U|]d  
}; qn"D#K'&(  
`o79g"kxe  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) !:LJzROh  
{ 4yaxl\2  
 //{{AFX_DATA_INIT(CAboutDlg) T\VNqs@  
 //}}AFX_DATA_INIT x90jw$\%7  
} *?yJkJ"  
.$", *d  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) yMLOUUWa8x  
{ JaWv]@9*  
 CDialog::DoDataExchange(pDX); hJ5z/5aE;  
 //{{AFX_DATA_MAP(CAboutDlg) 3`HnLD/  
 //}}AFX_DATA_MAP w(1Gi$Z(Q)  
} p.fF}B  
ED$DSz)x  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) BIf^~jAER%  
 //{{AFX_MSG_MAP(CAboutDlg) ?zq+jLyo  
 // No message handlers PN$ .X"D8  
 //}}AFX_MSG_MAP m}$+Hdk+7  
END_MESSAGE_MAP() BpO9As 1um  
ZyR_6n>L$  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) z"DkFvA  
: CDialog(CCaptureDlg::IDD, pParent) A>NsKWf{  
{ X E}H3/2  
 //{{AFX_DATA_INIT(CCaptureDlg) %o?IsIys  
  m_bControl = FALSE; Pw@olG'Ah  
  m_bAlt = FALSE; 5&CDHc7Oj  
  m_bShift = FALSE; rZ_>`}O2  
  m_Path = _T("c:\\");  Voh hQ  
  m_Number = _T("0 picture captured."); 5)zn:$cz  
  nCount=0; (1pEEq84  
  bRegistered=FALSE; -{|`H[nmD  
  bTray=FALSE; %;z((3F  
 //}}AFX_DATA_INIT IGFGa@C  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 +TeFt5[)h  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Fk^3a'/4KJ  
} lEPAP|~uw  
{OT:3SS7  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) j1Yq5`ia  
{ 7.<^j[?  
 CDialog::DoDataExchange(pDX); WW@"Z}?k  
 //{{AFX_DATA_MAP(CCaptureDlg) &jV_"_3n  
  DDX_Control(pDX, IDC_KEY, m_Key); ~9D~7UR  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ^_p%Yv  
  DDX_Check(pDX, IDC_ALT, m_bAlt); d0 er^ ~  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); %up}p/?  
  DDX_Text(pDX, IDC_PATH, m_Path); ;52'}%5  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Jf:,y~mV  
 //}}AFX_DATA_MAP +rNkN:/L  
} F5gObIJtuY  
Jx-wO/  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) W VkR56  
//{{AFX_MSG_MAP(CCaptureDlg) iO!6}yJ*V  
 ON_WM_SYSCOMMAND() ++[5q+b  
 ON_WM_PAINT() d]0a%Xh[  
 ON_WM_QUERYDRAGICON() W( *V2<$o  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Em13dem  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) N~=A  
 ON_BN_CLICKED(ID_CHANGE, OnChange) [A~G-  
//}}AFX_MSG_MAP icUT<@0  
END_MESSAGE_MAP() *QE<zt  
a0Oe:]mo\  
BOOL CCaptureDlg::OnInitDialog() -E&e1u,Mi  
{ ul5|.C  
 CDialog::OnInitDialog(); !)NidG  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ]Ql 0v"` F  
 ASSERT(IDM_ABOUTBOX < 0xF000); w,.qCpT$_  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ySdN;d:q  
 if (pSysMenu != NULL) #Gv{UU$]  
 { d<o.o?Vc  
  CString strAboutMenu; ;5|1M8]=0  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ~el-*=<m  
  if (!strAboutMenu.IsEmpty()) _JGs}aQ  
  { j kn^Z":  
   pSysMenu->AppendMenu(MF_SEPARATOR); {^q)^<#JT  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); (!K+P[g  
  } NVIWWX9?  
 } c^I0y!  
 SetIcon(m_hIcon, TRUE); // Set big icon #] KgUc5B  
 SetIcon(m_hIcon, FALSE); // Set small icon   &LQ%  
 m_Key.SetCurSel(0); c5i%(!>  
 RegisterHotkey(); ,axDMMDI  
 CMenu* pMenu=GetSystemMenu(FALSE); 'Am-vhpm  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); rjojG59U>  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 'u[%}S38  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND);  ;\b@)E}  
 return TRUE; // return TRUE unless you set the focus to a control L&w.j0fq  
} =_=*OEgO]  
*:_~Nn9_R;  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) W=-|`  
{ y62%26 [  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) KS>$`ax,  
 { EZr6oO@Nc  
  CAboutDlg dlgAbout; 9q4_j  
  dlgAbout.DoModal(); zj M/M  
 } P{oAObP%  
 else ~a+NJ6e1  
 { <O857 j  
  CDialog::OnSysCommand(nID, lParam); `6w#8}  
 } (6xDu.u?A  
} [e"RTTRfZ  
 mIc:2.q^  
void CCaptureDlg::OnPaint() z-u?s`k**  
{ v|+5:jFOqb  
 if (IsIconic()) z:G}>fk5  
 { sk X]8  
  CPaintDC dc(this); // device context for painting BnEdv8\,&s  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); rFd@mO  
  // Center icon in client rectangle x*8O*!ZZ  
  int cxIcon = GetSystemMetrics(SM_CXICON); h W.2p+  
  int cyIcon = GetSystemMetrics(SM_CYICON); C|e+0aW  
  CRect rect; `1'5j "v  
  GetClientRect(&rect); 9&jPp4qG  
  int x = (rect.Width() - cxIcon + 1) / 2; LdWc X`K  
  int y = (rect.Height() - cyIcon + 1) / 2; >BiRk%x  
  // Draw the icon eK_*q -  
  dc.DrawIcon(x, y, m_hIcon); ;) pl{_  
 } ~$aTM_4  
 else n9}RW;N+u  
 { YF[$Q=7.  
  CDialog::OnPaint(); pC^[[5A  
 } >[3X]n,0  
} uW[3G  
dtW0\^ .L  
HCURSOR CCaptureDlg::OnQueryDragIcon() #EwK"S~  
{ 9O;vUy)  
 return (HCURSOR) m_hIcon; G=$}5; t  
} 3V-6)V{KaE  
cf*zejbw  
void CCaptureDlg::OnCancel() 9)ea.Gu  
{ :('I)C  
 if(bTray) GXeAe}T  
  DeleteIcon(); ba&o;BLUy  
  CDialog::OnCancel(); BlaJl[Piv  
} B7 c[ 4  
.Ty,_3+{#p  
void CCaptureDlg::OnAbout() Vipp /WV  
{ ~%P3Pp  
 CAboutDlg dlg; e[4V%h  
 dlg.DoModal(); P6HGs? *  
} IK?]PmN4}  
S:Xs '0K_  
void CCaptureDlg::OnBrowse() (Jpm KO  
{ lPS*-p#IZ  
 CString str; &7][@v  
 BROWSEINFO bi; /co%:}ln  
 char name[MAX_PATH]; j`9Nwa  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); BTs0o&}e  
 bi.hwndOwner=GetSafeHwnd(); "_)|8|gN  
 bi.pszDisplayName=name; tR O IBq|  
 bi.lpszTitle="Select folder"; CKC0{J8g  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 4<Kgmy  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); F@<MT<TRf  
 if(idl==NULL) ,wT g$ g-$  
  return; B/_6Ieb+  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); EIK*49b2  
 str.ReleaseBuffer(); 6+ANAk  
 m_Path=str; {Q<0\`A  
 if(str.GetAt(str.GetLength()-1)!='\\') %BICt @E  
  m_Path+="\\"; h#O"Q+J9n  
 UpdateData(FALSE); A\g%  
} )[ b#g(Y(  
@LC~*_y   
void CCaptureDlg::SaveBmp() UT;4U;a,m  
{ ~,Mr0  
 CDC dc; X 7&U3v  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); @ RX`>r{_  
 CBitmap bm; K P6PQgc  
 int Width=GetSystemMetrics(SM_CXSCREEN); LaT8l?q q  
 int Height=GetSystemMetrics(SM_CYSCREEN); v>:=w|.HC  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Mk "vv k  
 CDC tdc; a 8-;   
 tdc.CreateCompatibleDC(&dc); oT!/J  
 CBitmap*pOld=tdc.SelectObject(&bm); :p$EiR  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); D"`[6EN[  
 tdc.SelectObject(pOld); NxB+?  
 BITMAP btm; vnVZJ}]w\  
 bm.GetBitmap(&btm); FK3Whe{KP{  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; \bRy(Z)  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 2YluJ:LN  
 BITMAPINFOHEADER bih; ex0oAt^  
 bih.biBitCount=btm.bmBitsPixel; U%,;N\:_  
 bih.biClrImportant=0; G{O\)gf  
 bih.biClrUsed=0; @ AggznA8  
 bih.biCompression=0; 4L11P  
 bih.biHeight=btm.bmHeight; iP,v=pS6  
 bih.biPlanes=1; ?q6Z's[  
 bih.biSize=sizeof(BITMAPINFOHEADER); _f66>a<  
 bih.biSizeImage=size; a+'}XEhSC:  
 bih.biWidth=btm.bmWidth; R( GmU4  
 bih.biXPelsPerMeter=0; O&=KlnI:  
 bih.biYPelsPerMeter=0; FdM<;}6T  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); g~|y$T  
 static int filecount=0; R9q0,yQW  
 CString name; ~}9Bn)@  
 name.Format("pict%04d.bmp",filecount++); gE1|lY$NL  
 name=m_Path+name; e SK((T  
 BITMAPFILEHEADER bfh; n5>B LtY  
 bfh.bfReserved1=bfh.bfReserved2=0; 9PCa*,  
 bfh.bfType=((WORD)('M'<< 8)|'B'); q /:T1a7!  
 bfh.bfSize=54+size; >*{:l,LH  
 bfh.bfOffBits=54; |yU3Kt  
 CFile bf; +/(|?7i@  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ A{M+vsL  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); IuDT=A  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); &p )@8HY  
  bf.WriteHuge(lpData,size); 1oB$u!6P  
  bf.Close(); LVoyA/ F  
  nCount++; $)l2G;&  
 } Pm;I3r=R\  
 GlobalFreePtr(lpData); u(8~4P0w  
 if(nCount==1) F6DxvyANr  
  m_Number.Format("%d picture captured.",nCount); {9Db9K^  
 else *afejjW[  
  m_Number.Format("%d pictures captured.",nCount); A ^-Z)0 :  
  UpdateData(FALSE); yW{mK  
} *b:u * `@  
7^&lbzVbm(  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) R~!\ -6%_  
{ / Z1Wy-Z  
 if(pMsg -> message == WM_KEYDOWN) =#b4c>  
 { QYH."7X >  
  if(pMsg -> wParam == VK_ESCAPE) tz"5+uuu  
   return TRUE; (;C$gnr.C  
  if(pMsg -> wParam == VK_RETURN) 2c"/QT  
   return TRUE; A0UV+ -PP  
 } T<XfZZ)l<`  
 return CDialog::PreTranslateMessage(pMsg); 8B_0!U& ]  
} "wC0eDf  
XRtyC4f  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) IL2e6b  
{ wG;}TxrLS  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ :ao^/&HZ  
  SaveBmp(); 219R&[cb  
  return FALSE; (I>HWRH  
} prqyoCfq  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ >eEnQ}Y  
 CMenu pop; kHGeCJe\{  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); O(WEgz  
 CMenu*pMenu=pop.GetSubMenu(0); mn(/E/  
 pMenu->SetDefaultItem(ID_EXITICON); FLK"|*A  
 CPoint pt; ?ISI[hoc  
 GetCursorPos(&pt); "k/;`eAP  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); =!(S<];  
 if(id==ID_EXITICON) W;q#ZD(;  
  DeleteIcon(); %N7gT*B:  
 else if(id==ID_EXIT) eSJAPU(D  
  OnCancel(); -<]\l3E&J  
 return FALSE; Av@& hD\  
} ;tXB46  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ]!]`~ Z/  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) =7FE/S  
 AddIcon(); V[4(~,9  
 return res; e',hC0&S  
} <zfO1~^  
7E;>E9 '  
void CCaptureDlg::AddIcon() PG\\V$}A(  
{ r(PJ~8)(=  
 NOTIFYICONDATA data; Q -M rH   
 data.cbSize=sizeof(NOTIFYICONDATA); qw9e) `3$  
 CString tip; 9)ACgz&(  
 tip.LoadString(IDS_ICONTIP); aIQrb  
 data.hIcon=GetIcon(0); !&'# a  
 data.hWnd=GetSafeHwnd(); k,a,h^{}j  
 strcpy(data.szTip,tip); #"=%b e3  
 data.uCallbackMessage=IDM_SHELL;  =|^X$H  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; q2[+-B)m  
 data.uID=98; un.G6|S  
 Shell_NotifyIcon(NIM_ADD,&data); =%Q\*xaR.W  
 ShowWindow(SW_HIDE); zNNzsT8na  
 bTray=TRUE; eL>K2Jxq  
} s'R~ r  
>&*6Fqd  
void CCaptureDlg::DeleteIcon() LBW.*PHW  
{ z~GVvgd  
 NOTIFYICONDATA data; e_YW~z=6t  
 data.cbSize=sizeof(NOTIFYICONDATA); ]R97n|s_  
 data.hWnd=GetSafeHwnd(); =~,$V<+c  
 data.uID=98; %{N>c:2I$  
 Shell_NotifyIcon(NIM_DELETE,&data); Rh!L'? C  
 ShowWindow(SW_SHOW); 8yY"x ['  
 SetForegroundWindow(); 71K\.[ =-  
 ShowWindow(SW_SHOWNORMAL); Na~g*)uT$  
 bTray=FALSE; +J\L4ri k  
} p*A^0DN'Fn  
e}{8a9J<%_  
void CCaptureDlg::OnChange() .t"n]X i  
{ >l7eoj  
 RegisterHotkey(); P&qy.0  
} I@8+k&nXS  
v]LFZI5  
BOOL CCaptureDlg::RegisterHotkey() NTXws4'D  
{ *uk \O]  
 UpdateData(); m~Lf^gbG?  
 UCHAR mask=0; J`U$b+q6  
 UCHAR key=0; =g{_^^n  
 if(m_bControl) QT7w::ht  
  mask|=4; sV9{4T~#|  
 if(m_bAlt) g @c=Bt$  
  mask|=2; &. |;yt%v  
 if(m_bShift) HV]~=Bw2I  
  mask|=1; + TPbIRA  
  key=Key_Table[m_Key.GetCurSel()]; >WGX|"!"  
 if(bRegistered){ m]+X }|  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask);  9'L1KQ  
  bRegistered=FALSE; ^N*pIVLC  
 } |HKHN? )  
 cMask=mask; 8cYuzt]..  
 cKey=key; @c.11nfn`  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); $bF`PGR_  
 return bRegistered; YHwVj?6W  
} BDv|~NHs  
eZa3K3^  
  四、小结 &4ug3  
!?tu! M<1?  
  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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