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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: S'=}eeG  
  w~>tpkUB  
  一、实现方法 gaR~K  
cQq78Lo  
  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: MLN+ BuS  
vA*Q}]Ov  
#pragma data_seg("shareddata") WNF#eM?[a  
HHOOK hHook =NULL; //钩子句柄 8UXtIuQ  
UINT nHookCount =0; //挂接的程序数目 "B0I$`~wu  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 \I7,1I  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 FvDi4[F#  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ]\*_}  
static int KeyCount =0; WU~L#Ih.V  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 G.>Ul)O:a  
#pragma data_seg() ?cB26Zrcb  
,=dc-%J  
  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。 dg4q+  
jAfqC@e  
  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: $J*lD -h-  
y':65NMda  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR P9 qZjBS  
cKey,UCHAR cMask) w-LaSJ(T  
{ w/@ tH  
 BOOL bAdded=FALSE; cnj32H^+  
 for(int index=0;index<MAX_KEY;index++){ "8/BVW^bv  
  if(hCallWnd[index]==0){ t"X^|!hKIF  
   hCallWnd[index]=hWnd; 6@Ir|o  
   HotKey[index]=cKey; fzzk#jU  
   HotKeyMask[index]=cMask; L4v26*P  
   bAdded=TRUE; X;CRy,  
   KeyCount++; !H~PF*,hY  
   break; L+_ JKc  
  } sU"sd7#A  
 } 7myYs7N8[  
 return bAdded; r+,JM L   
} t_ id/  
//删除热键 d?N[bA  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) MC%!>,tC  
{ *`V r P  
 BOOL bRemoved=FALSE; HEF\TH9  
 for(int index=0;index<MAX_KEY;index++){ !%/(a)B$^$  
  if(hCallWnd[index]==hWnd){ mLDuizWI  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ozW\`  
    hCallWnd[index]=NULL; ebhV;Q.  
    HotKey[index]=0; -AwkP  
    HotKeyMask[index]=0; ^ >#@qMw  
    bRemoved=TRUE; xPzBbe  
    KeyCount--;   9EWw  
    break; @P<aTRy,f  
   } dlBr2 9  
  } K k|mV&3J  
 } A5RM&y  
 return bRemoved; o>A']+`E u  
} t4+bRmS`_  
nf,Ez  
m3=Cg$n  
  DLL中的钩子函数如下: [midNC+,  
v;d3uunqv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) d^I:{Ii'  
{ ),5A&qT*  
 BOOL bProcessed=FALSE; a|Wrc)UR  
 if(HC_ACTION==nCode) ^tI4FQ>Y  
 { x]vyt}oCmk  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Q$A;Fk}-  
   switch(wParam) YqYobL*q/  
   {  k\A4sj  
    case VK_MENU: jfpbD /  
     MaskBits&=~ALTBIT; =1zRm >m  
     break; lfqsoIn;  
    case VK_CONTROL: /~pB_l  
     MaskBits&=~CTRLBIT; p%IVWeZnx  
     break; 9b)'vr*Hy7  
    case VK_SHIFT: yZ,S$tSR  
     MaskBits&=~SHIFTBIT; {VKP&{~O  
     break; ksF4m_E>YB  
    default: //judge the key and send message rAS2qt  
     break; Tfw5i,{  
   } cQ(,M  
   for(int index=0;index<MAX_KEY;index++){ .cB>ab&  
    if(hCallWnd[index]==NULL) S%o6cl=  
     continue; scZ&}Ni  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3 ]w a8|  
    { fK+[r1^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); rS_pv=0S  
     bProcessed=TRUE; CmdPa!4)  
    } ~LJtlJ 0  
   } [uFv_G{H  
  } 'W/AYF^5  
  else if((lParam&0xc000ffff)==1){ //有键按下 +{WZpP},v  
   switch(wParam) R_b)2FU1y  
   { ZV$!dHW/  
    case VK_MENU: QT\"r T9#  
     MaskBits|=ALTBIT; Iy Vmz'  
     break; lQG;WVqW  
    case VK_CONTROL: 2tZ\/6G<  
     MaskBits|=CTRLBIT; i7\MVI 8  
     break; r=<1*u  
    case VK_SHIFT: L6J.^tpO  
     MaskBits|=SHIFTBIT; s"(F({J  
     break; UDV6 ##$  
    default: //judge the key and send message (VBO1f  
     break; Zz!yv(e)H  
   } ;Ngu(es6  
   for(int index=0;index<MAX_KEY;index++){ q1Ehl S  
    if(hCallWnd[index]==NULL) tW%!|T5/  
     continue; o^+g2;Ro  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Nj+g Sa9  
    { =|IY[2^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); D()tP  
     bProcessed=TRUE; Ummoph7_@  
    } 0> U7]wZKc  
   } !%>(O@~"|  
  } [wM]w  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Jf@~/!m}'  
   for(int index=0;index<MAX_KEY;index++){ K#[ z5  
    if(hCallWnd[index]==NULL) a+P^?N  
     continue; oe{,-<yck  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) zUz j F  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >?r8D48`  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 LteZ7e  
   } x k&# fW^r  
  } R|-!5J4h  
 } Y9y'`}+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Imz1"+E~  
} yu$xQ~ o  
8P*wt'Q$  
  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: 2 t:CK  
?d@zTAI  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); o*:D/"gb  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "]x#kM  
W|V9: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: .t$1B5  
*&$2us0%%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) NJPp6RZ%  
{ a5uBQ?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) %)P)Xb  
 { @T&w n k  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 3(=QY)  
  SaveBmp(); mLH,6rO9  
  return FALSE; k1Sr7|  
 } I4MZ JAYk  
 …… //其它处理及默认处理 d%Nx/DS)  
} s+6tdBvzs  
=iE)vY,?"}  
jF|LPWl  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 )* Rr5l /l  
i#(+Kxr]>  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 RwDXOdgu  
o~ReeZ7)Zg  
  二、编程步骤 y{J7^o(_~  
Y&1Yc)*O  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; .'=-@W*  
w! ':Ws  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; \_AoG8B  
]`TX%Qni  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; z_A34@a  
(]sk3 A  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; )KcY<K  
06>+loBG  
  5、 添加代码,编译运行程序。 oZ!+._9  
s|-g)  
三、程序代码 r,cK#!<%  
R6qC0@*  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ;-!O+c  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 7*g'4p-  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ okLhe F  
#if _MSC_VER > 1000 d?>pcT)G_  
#pragma once I0(nRu<  
#endif // _MSC_VER > 1000 `&g1`vg  
#ifndef __AFXWIN_H__ 9~yp =JOV@  
#error include 'stdafx.h' before including this file for PCH 0m'tPFQ|  
#endif B}npom\tC  
#include "resource.h" // main symbols yrV]I(Xe  
class CHookApp : public CWinApp 7:X@lmBz=  
{ Qd"u$~ qC  
 public: xoNn'LF#u  
  CHookApp(); 95 oh}c  
  // Overrides d6{0[T^L  
  // ClassWizard generated virtual function overrides y\}<N6  
  //{{AFX_VIRTUAL(CHookApp) l#;o^H i  
 public: @rxfOc0J#  
  virtual BOOL InitInstance(); r9$7P?zm  
  virtual int ExitInstance(); 1zc-$B`t  
  //}}AFX_VIRTUAL m'5rzZP  
  //{{AFX_MSG(CHookApp) <R8!fc{`  
  // NOTE - the ClassWizard will add and remove member functions here. lBfG#\rdW~  
  // DO NOT EDIT what you see in these blocks of generated code ! J]qx4c  
  //}}AFX_MSG hdurT  
  DECLARE_MESSAGE_MAP() 0xpE+GY  
}; CUa`#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); _`q ei0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @-Ln* 3n  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <PXnR\  
BOOL InitHotkey(); JURJN+)z  
BOOL UnInit(); 19;F+%no#  
#endif t$5)6zG  
o]m56  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. BV6 U -  
#include "stdafx.h" LKI2R_|n  
#include "hook.h" M;1B}x@  
#include <windowsx.h> Ub<^;Du5  
#ifdef _DEBUG <!I^xo [  
#define new DEBUG_NEW L_ 2R3 w  
#undef THIS_FILE ~VaO,8&+L  
static char THIS_FILE[] = __FILE__; J7s\  
#endif c9axzg UA  
#define MAX_KEY 100 n]J;BW& Av  
#define CTRLBIT 0x04 ,)P6fa/  
#define ALTBIT 0x02 K 6HH_T  
#define SHIFTBIT 0x01 =Btmi  
#pragma data_seg("shareddata") c`4i#R  
HHOOK hHook =NULL; \>(S?)6  
UINT nHookCount =0; $_b^p=  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey R9O[`~BA2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT il >XV>  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey rklK=W z  
static int KeyCount =0; ^%2S,3*0  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift L+ d4&x  
#pragma data_seg() Y<9Lqc.i  
HINSTANCE hins; 4z^5|$?_ta  
void VerifyWindow(); xgv&M:%D-  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) h6C:`0o  
//{{AFX_MSG_MAP(CHookApp) Kgu#M i~  
// NOTE - the ClassWizard will add and remove mapping macros here. - ]Mp<Y  
// DO NOT EDIT what you see in these blocks of generated code! IL N0/eH  
//}}AFX_MSG_MAP 7P7d[KP<  
END_MESSAGE_MAP() %eLf6|1x  
ro*$OLc/  
CHookApp::CHookApp() O7GJg;>?  
{ Hp?uYih0  
 // TODO: add construction code here, 8i'EO6  
 // Place all significant initialization in InitInstance a0[Mx 4  
} %!QY:[   
;+iw?"  
CHookApp theApp; SoJ'y6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) =9'px3:'WR  
{ BSbi.@@tp  
 BOOL bProcessed=FALSE; T1c.ER}17  
 if(HC_ACTION==nCode) jq"iLgEMO  
 { 34Z$a{ w  
  if((lParam&0xc0000000)==0xc0000000){// Key up 5W~-|8m  
   switch(wParam) aO>Nev  
   { >KMTxHE`+  
    case VK_MENU: 0I \l_St@  
     MaskBits&=~ALTBIT; TNK~ETE4  
     break; o? {rPFR  
    case VK_CONTROL: e x`mu E  
     MaskBits&=~CTRLBIT; >ISN2Kn   
     break; > ;zQ.2*  
    case VK_SHIFT: hp)k[|u;  
     MaskBits&=~SHIFTBIT; 3# r` e  
     break; R=u!Rcv R  
    default: //judge the key and send message + c"$-Jr  
     break; }_"<2|~_  
   } l Vc':,z  
   for(int index=0;index<MAX_KEY;index++){ 0R[onPU_vZ  
    if(hCallWnd[index]==NULL) )k'4]=d <  
     continue; @F,8M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) gg%9EJpP  
    { 'Xw> ?[BB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ThmN^N  
     bProcessed=TRUE; +p#Q|o'  
    } l4`HuNR1  
   } FW7@7cVoF  
  } lL{1wCsl  
  else if((lParam&0xc000ffff)==1){ //Key down O9(6?n  
   switch(wParam) !K319 eE  
   { zM*PN|/%sH  
    case VK_MENU: CH3bpZv  
     MaskBits|=ALTBIT; N J_#;t#j  
     break; tyyfMA?'L;  
    case VK_CONTROL: ww(.   
     MaskBits|=CTRLBIT; <>  |/U`  
     break; {u,yX@F4l  
    case VK_SHIFT: Zn9ecN  
     MaskBits|=SHIFTBIT; {&Es3+{A  
     break; o\7q!  
    default: //judge the key and send message o$,Dh?l  
     break; #X?#v7i",D  
   } bEc @"^)  
   for(int index=0;index<MAX_KEY;index++) %~A$cc  
   { a]mPc^h  
    if(hCallWnd[index]==NULL) ;'g.%  
     continue; (D 5.NB%@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _pS!sY~d  
    { 7y2-8e L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); L-v-KO6  
     bProcessed=TRUE; c (Gl3^  
    } Q!_@Am"h  
   } mfpL?N  
  } _wMYA8n  
  if(!bProcessed){ KJ&~z? X  
   for(int index=0;index<MAX_KEY;index++){ rAZsVnk?  
    if(hCallWnd[index]==NULL) cw)'vAE  
     continue; ubvXpK:.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) C-6m[W8S  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); t<QSp6n""  
   } v)AadtZ0d  
  } $IU|zda8  
 } FaUc"J  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :0)nL  
} ;x=r.3OQy  
}qhNz0*  
BOOL InitHotkey() 1FQ_`wF4  
{ "Yu';&  
 if(hHook!=NULL){ +zup+=0e  
  nHookCount++; '7Aj0U(  
  return TRUE; 31@m36? X  
 } uY~xHV_-  
 else IR<`OA  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 3S_H hvB  
  if(hHook!=NULL) F;,LY:s|Z  
   nHookCount++; V;}6C&aP.  
  return (hHook!=NULL); KKLW-V\6K  
} Rw9 *!<Izt  
BOOL UnInit() BDCFToSf|  
{ R?K[O   
 if(nHookCount>1){ LG qg0 (  
  nHookCount--; Mkc|uiT   
  return TRUE; a'pJg<  
 } S@'yuAe*G  
 BOOL unhooked = UnhookWindowsHookEx(hHook); R:LT hFx  
 if(unhooked==TRUE){ ~wdKO7fs  
  nHookCount=0; $sX X6K),  
  hHook=NULL; 82bOiN15  
 } `mfN3Q*[c  
 return unhooked; %G%D[ i]  
} "uthFE  
z]J pvw`p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #*|0WaC  
{ KW~fW r8  
 BOOL bAdded=FALSE; vKvT7Zxc  
 for(int index=0;index<MAX_KEY;index++){ /EpsJb`kj  
  if(hCallWnd[index]==0){ 4}\Dr %US  
   hCallWnd[index]=hWnd; (.DX</f/4  
   HotKey[index]=cKey; H!+T2<F9R  
   HotKeyMask[index]=cMask; qAF.i^  
   bAdded=TRUE; 9J!@,Zsh  
   KeyCount++; 5U3 b&0  
   break; ,Q5Z<\  
  } Vu`O%[Q/  
 } ]1XJQW@gF  
 return bAdded; lVmm`q6n9  
} {hLS,Me  
jPjFp35;zb  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) wv eej@zs  
{ 8+irul{H_  
 BOOL bRemoved=FALSE; ?z2k 74&M^  
 for(int index=0;index<MAX_KEY;index++){ ~e)`D nJ  
  if(hCallWnd[index]==hWnd){ <CJ`A5N  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ d&'}~C`~k  
    hCallWnd[index]=NULL; +$YluGEJ  
    HotKey[index]=0; F5#P{ zk|  
    HotKeyMask[index]=0; ?oc#$fcQ~  
    bRemoved=TRUE; q-;z!iq|!  
    KeyCount--; *:*Kdt`'G  
    break; . >{.!a  
   } X8Xw'  
  } -PI_ *  
 } f[b x|6  
 return bRemoved; $g?`yE(K  
} Y;L,}/[  
2 P=c1;  
void VerifyWindow() HZ#<+~J  
{ uH6QK\  
 for(int i=0;i<MAX_KEY;i++){ UqP %S$9  
  if(hCallWnd!=NULL){ !/6`< eQ `  
   if(!IsWindow(hCallWnd)){ TzCNY@y  
    hCallWnd=NULL; #_, l7q8U  
    HotKey=0; AvN\^ &G  
    HotKeyMask=0; Z5vpo$l  
    KeyCount--; jtMN)TM  
   } <oE(I)r4,  
  } ZS-O,[  
 } -qPYm?$  
} &s|&cT  
xlqh,?'>W  
BOOL CHookApp::InitInstance() gZFtV  
{ BtyBZ8P;e  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ?E@ 9Nvr  
 hins=AfxGetInstanceHandle(); %D(% lh2  
 InitHotkey(); J&xH "U  
 return CWinApp::InitInstance(); 03iD(,@  
} nJ.<yrzi  
$_6DvJ0  
int CHookApp::ExitInstance() 6o_t;cpT  
{ @bN`+DC!<  
 VerifyWindow(); $6ZO V/0  
 UnInit(); l%aiG+z%6}  
 return CWinApp::ExitInstance(); X676*;:!.  
} RtrESwtR  
2Mc}>UI?eO  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file BwN65_5p  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Z2yZz:.'  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ PD$g W`V  
#if _MSC_VER > 1000 Yy4? |wVl  
#pragma once dv+)U9at  
#endif // _MSC_VER > 1000 ~*|0yPFg  
pZu2[  
class CCaptureDlg : public CDialog Zd/ACZ[  
{ pU4 B6KTW  
 // Construction k{/2vV[`]  
 public: MCOz-8@|Y  
  BOOL bTray; !BN7 B  
  BOOL bRegistered; 1D42+cy  
  BOOL RegisterHotkey(); : QK )Ym  
  UCHAR cKey; KJ Gh)  
  UCHAR cMask; vHY."$|H  
  void DeleteIcon(); By|y:  
  void AddIcon(); sLE@Cm]k  
  UINT nCount; QU/Q5k  
  void SaveBmp(); QRs!B!Fn0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 1C[j:Ly/  
  // Dialog Data ?fB}9(6  
  //{{AFX_DATA(CCaptureDlg) U"} ml  
  enum { IDD = IDD_CAPTURE_DIALOG }; mK3U*)A   
  CComboBox m_Key; ^^[MDjNy@  
  BOOL m_bControl; U*G9fpVy  
  BOOL m_bAlt; `!?SA<a:  
  BOOL m_bShift; fr~e!!$H  
  CString m_Path; ~ {sRK  
  CString m_Number; 8~QEJW$  
  //}}AFX_DATA ZyBNo]  
  // ClassWizard generated virtual function overrides M<t>jM@'A#  
  //{{AFX_VIRTUAL(CCaptureDlg) _y Q*  
 public: ;~Eb Q  
  virtual BOOL PreTranslateMessage(MSG* pMsg); :eQ?gM!,  
 protected: &8R%W"<K  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \`N%77A  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 4qtjP8Zv[  
  //}}AFX_VIRTUAL 6Sh0%F s  
  // Implementation &j}\ZD  
 protected: R v6 1*F4  
  HICON m_hIcon; YYFJJ,7?  
  // Generated message map functions tcYbM+4e  
  //{{AFX_MSG(CCaptureDlg) k^3|A3A  
  virtual BOOL OnInitDialog(); `3!ERQU  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 9QaEUy*,  
  afx_msg void OnPaint(); ,Mf@I5?  
  afx_msg HCURSOR OnQueryDragIcon(); [gZd$9a  
  virtual void OnCancel(); D*d@<&Bl4<  
  afx_msg void OnAbout(); -(FVTWi0  
  afx_msg void OnBrowse(); \BC|`)0h  
  afx_msg void OnChange(); h>,yqiY4p  
 //}}AFX_MSG "j5b$T0P>  
 DECLARE_MESSAGE_MAP() @q9uU9c  
}; &:g5+([<  
#endif OczVObbS  
gd>Op  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file |r"1 &ow5  
#include "stdafx.h" Sr)rKc  
#include "Capture.h" q^],K'  
#include "CaptureDlg.h" j[ !'l,I  
#include <windowsx.h> kN9pl^2  
#pragma comment(lib,"hook.lib") K8y/U(@|D  
#ifdef _DEBUG =T$-idx1l  
#define new DEBUG_NEW k36%n *4  
#undef THIS_FILE k~WX6rEJ  
static char THIS_FILE[] = __FILE__; ,?;q$Xoi  
#endif @; ayl  
#define IDM_SHELL WM_USER+1 w=Xil  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hv 18V>8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); yyJ4r}TE  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _K{hq<g  
class CAboutDlg : public CDialog %of#VSk  
{ -R 4 t  
 public: :_YpS w<Q  
  CAboutDlg(); *h Ph01  
  // Dialog Data &) 7umdSgi  
  //{{AFX_DATA(CAboutDlg) iJ_FJ[ U  
  enum { IDD = IDD_ABOUTBOX }; =/MAKi}g  
  //}}AFX_DATA nfck3h  
  // ClassWizard generated virtual function overrides p(UUH3%W  
  //{{AFX_VIRTUAL(CAboutDlg) 1P&XG@  
 protected: 3IHya=qN  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Wd'wL"6De  
  //}}AFX_VIRTUAL o >bf7+D  
  // Implementation Eh;SH^&6  
 protected: !h&A^sAc  
  //{{AFX_MSG(CAboutDlg) (v*$ExF  
  //}}AFX_MSG 9,y*kC  
  DECLARE_MESSAGE_MAP() #"%=7(  
}; _A%} >:q  
R*I{?+  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) VJ P]Jy_  
{ jJ-j   
 //{{AFX_DATA_INIT(CAboutDlg) qy6zHw  
 //}}AFX_DATA_INIT s  bV6}  
} v/6QE;BY&Q  
7>`QX%  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) "YD<pRVB  
{ :%qJAjR&  
 CDialog::DoDataExchange(pDX); 1lu _<?O  
 //{{AFX_DATA_MAP(CAboutDlg) -?n|kSHX  
 //}}AFX_DATA_MAP V}ZF\SG(K  
} DWDL|4 og  
Q}ho Y  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) }~$zdgMT  
 //{{AFX_MSG_MAP(CAboutDlg) U]Q2EL\%  
 // No message handlers {zhN>n_  
 //}}AFX_MSG_MAP i[)H!%RV*  
END_MESSAGE_MAP() T%K"^4k  
`V[{(&?,n  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) +~RiCZt  
: CDialog(CCaptureDlg::IDD, pParent) b 8v?@s~  
{ jI0gQ [  
 //{{AFX_DATA_INIT(CCaptureDlg) B@dA?w.x  
  m_bControl = FALSE; p;Kw$fQ?  
  m_bAlt = FALSE; :~BY[")  
  m_bShift = FALSE; k0.|%0?K  
  m_Path = _T("c:\\"); dC;@ Fn  
  m_Number = _T("0 picture captured."); -xtj:UO  
  nCount=0; w$UWfL(  
  bRegistered=FALSE; ,dK<2XP  
  bTray=FALSE; iO4YZ!  
 //}}AFX_DATA_INIT t>><|~wp  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 tn201TDZ]=  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); j.X3SQb4G  
} 1QXv}36#3n  
<e|I?zI9-  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) {Cnz7TVB  
{ -sl] funRy  
 CDialog::DoDataExchange(pDX); 7u-o7#,X2  
 //{{AFX_DATA_MAP(CCaptureDlg) !Q =H)\3  
  DDX_Control(pDX, IDC_KEY, m_Key); # (B <n  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); GQO}E@W6C  
  DDX_Check(pDX, IDC_ALT, m_bAlt); .0;Z:x_3  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); MHJH@$|]  
  DDX_Text(pDX, IDC_PATH, m_Path); JSQNx2VqQ  
  DDX_Text(pDX, IDC_NUMBER, m_Number); [5^"U+`{x  
 //}}AFX_DATA_MAP 0m_c43+^  
} 7:t+  
`~QS3zq  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) DQY*0\  
//{{AFX_MSG_MAP(CCaptureDlg) Lh0Pvq0C  
 ON_WM_SYSCOMMAND() lpLjfHr  
 ON_WM_PAINT() GB Ia Ul  
 ON_WM_QUERYDRAGICON() !lp *0h(7  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) N=lFf+  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 6M sVV_/  
 ON_BN_CLICKED(ID_CHANGE, OnChange) g" c|%3  
//}}AFX_MSG_MAP Q7V*~{  
END_MESSAGE_MAP() DjzHEqiH  
32#|BBY  
BOOL CCaptureDlg::OnInitDialog() . #+N?D<  
{ >"Tivc5  
 CDialog::OnInitDialog(); }bkQr)us  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); \W%Aeg*c  
 ASSERT(IDM_ABOUTBOX < 0xF000); ]'  ck!eG  
 CMenu* pSysMenu = GetSystemMenu(FALSE); #ZzFAt  
 if (pSysMenu != NULL) idG}p+(;  
 { 45?aV@  
  CString strAboutMenu; OD;-0Bj  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 8:D|[u;iG  
  if (!strAboutMenu.IsEmpty()) "`va_Mk  
  { ,}8|[)"  
   pSysMenu->AppendMenu(MF_SEPARATOR); B<V8:vOam  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); QB3vp4pBg@  
  } bQTkW<7gh  
 } *F4"mr|\  
 SetIcon(m_hIcon, TRUE); // Set big icon ,RA;X  
 SetIcon(m_hIcon, FALSE); // Set small icon !Eqp,"ts7  
 m_Key.SetCurSel(0); Npr<{}ZE  
 RegisterHotkey(); [m*E[0Hu  
 CMenu* pMenu=GetSystemMenu(FALSE); /"q wC  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); AbqeZn  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); pgp@Zw)r)k  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); %1\MW+  
 return TRUE; // return TRUE unless you set the focus to a control `<cn b!]  
} {Yt@H  
`jI$>{oa  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) VM.4w.})_E  
{ T(@J]Y-  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) )qbjX{GZ7  
 { f3[/zcm;  
  CAboutDlg dlgAbout; 3?n2/p 7=  
  dlgAbout.DoModal(); jPDk~|  
 } vV(?A  
 else :gwM$2vv  
 { _NwB7@ e  
  CDialog::OnSysCommand(nID, lParam); mFGiysM  
 } .+.'TY--  
} 8lNkY`P7s  
3EVAB0/$  
void CCaptureDlg::OnPaint() U8||)  +  
{ VGe OoS  
 if (IsIconic()) $\9M6k'  
 { CogN1,GJ  
  CPaintDC dc(this); // device context for painting +N3f{-{"Yo  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); X~o6Xkg  
  // Center icon in client rectangle _Hp[}sv4)  
  int cxIcon = GetSystemMetrics(SM_CXICON); G\PFh&  
  int cyIcon = GetSystemMetrics(SM_CYICON); ]YF_c,Q  
  CRect rect; y\C_HCU H  
  GetClientRect(&rect); NUQ?Q Q  
  int x = (rect.Width() - cxIcon + 1) / 2; 79yF {  
  int y = (rect.Height() - cyIcon + 1) / 2; '0jjoZ:  
  // Draw the icon Cih~cwE  
  dc.DrawIcon(x, y, m_hIcon); ge[hAI2I  
 } 9f|+LN##  
 else CAJ]@P#Xj+  
 { zP`&X:8  
  CDialog::OnPaint(); R?D c*,  
 } GN=ugP 9  
} @OB7TI_/   
CI8bHY$  
HCURSOR CCaptureDlg::OnQueryDragIcon() kGkfLY6B  
{ Wcf;ZX  
 return (HCURSOR) m_hIcon; NB.s2I7  
} !k}]`z^d  
GKg&lM!O$  
void CCaptureDlg::OnCancel() Y9w^F_relL  
{ |ctcY*+  
 if(bTray) zF7*T?3b"  
  DeleteIcon(); k^i\<@v  
  CDialog::OnCancel(); qOD:+b  
} !zW22M  
Lk>GEi|  
void CCaptureDlg::OnAbout() a49xf^{1"i  
{ ],l}J'.8<V  
 CAboutDlg dlg; 7jzd I!  
 dlg.DoModal(); kp=wz0#  
} ?]]7PEee*  
0;/},B[A  
void CCaptureDlg::OnBrowse() XD8Q2un  
{ sWGc1jC?.F  
 CString str; GU,ztO.w3  
 BROWSEINFO bi; T4e-QEH  
 char name[MAX_PATH]; 0)0,&@])7  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); U(~d^9/#  
 bi.hwndOwner=GetSafeHwnd(); D\LXjEm e.  
 bi.pszDisplayName=name; 1(`UzC=R|  
 bi.lpszTitle="Select folder"; D>`lN  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; tYzpL   
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); J};=)xLX;  
 if(idl==NULL) Fs 95^T  
  return; d# >iFD+  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 6p)dO c3L  
 str.ReleaseBuffer(); @ |^;d  
 m_Path=str; Ni Y.OwKr  
 if(str.GetAt(str.GetLength()-1)!='\\') $OP w$  
  m_Path+="\\"; 6^#@y|.  
 UpdateData(FALSE); o'*7I|7a  
} 3qVDHDQ?ZV  
rsPo~nA  
void CCaptureDlg::SaveBmp() }M|,Z'@*  
{ .?NraydwV  
 CDC dc; D6NgdE7b  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); #bZT&YE^  
 CBitmap bm; YacLYo#  
 int Width=GetSystemMetrics(SM_CXSCREEN); 1b LY1  
 int Height=GetSystemMetrics(SM_CYSCREEN); [R%Pf/[Fr  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Ra-%,cS  
 CDC tdc; RKtU@MX49  
 tdc.CreateCompatibleDC(&dc); M\L^ Wf9  
 CBitmap*pOld=tdc.SelectObject(&bm); YCI- p p  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); T8US` MZ  
 tdc.SelectObject(pOld); `F,*NESv  
 BITMAP btm; Jr.4Y>;}e3  
 bm.GetBitmap(&btm); LR:meCOI  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; &Z%|H>+;T  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); C/{%f,rU  
 BITMAPINFOHEADER bih; %]\IC(q  
 bih.biBitCount=btm.bmBitsPixel; @";zM&  
 bih.biClrImportant=0; V'm4DR#M  
 bih.biClrUsed=0;  }0f"SWO>  
 bih.biCompression=0; s+7#TdhA  
 bih.biHeight=btm.bmHeight; UR' P,  
 bih.biPlanes=1; rL3 f%L  
 bih.biSize=sizeof(BITMAPINFOHEADER); M # ) @!  
 bih.biSizeImage=size; .j l|? o  
 bih.biWidth=btm.bmWidth; tMOhH #  
 bih.biXPelsPerMeter=0; i286`SLU  
 bih.biYPelsPerMeter=0; 7 yp}  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); u0?,CQPL  
 static int filecount=0; t(Sjo8, b  
 CString name; =1e>$E#  
 name.Format("pict%04d.bmp",filecount++); Y-y<gW  
 name=m_Path+name; 9yWQ}h  
 BITMAPFILEHEADER bfh; >j}.~$6dj_  
 bfh.bfReserved1=bfh.bfReserved2=0; m6iQB\ \  
 bfh.bfType=((WORD)('M'<< 8)|'B'); =ec"G2$?"  
 bfh.bfSize=54+size; |x/00XhS  
 bfh.bfOffBits=54; uh 3yiDj@a  
 CFile bf; m0[JiwPI  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ w^N3Ma  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); s;!Tz)  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); T$vDw|KSVP  
  bf.WriteHuge(lpData,size); M_Z(+k{Gy  
  bf.Close(); %D $+Z(  
  nCount++; %[J|n~8_Z  
 } /AhN$)(O  
 GlobalFreePtr(lpData); l/:23\  
 if(nCount==1) Ow f:Kife  
  m_Number.Format("%d picture captured.",nCount); $5v:z   
 else rc()Eo50  
  m_Number.Format("%d pictures captured.",nCount); IuN:*P  
  UpdateData(FALSE); 0.kQqy~5  
}  _YPu  
KoF_G[m  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) HCOE'24I  
{ Bq*aP*jv  
 if(pMsg -> message == WM_KEYDOWN) ,o68xfdZVW  
 { [_w;=l0 ;  
  if(pMsg -> wParam == VK_ESCAPE) S*9qpes-m|  
   return TRUE; qdY*y&}"J  
  if(pMsg -> wParam == VK_RETURN) Udl8?EVSz  
   return TRUE; p6|RV(?8  
 } p8_ CY[U  
 return CDialog::PreTranslateMessage(pMsg); y~-dQ7r  
} Yj#4{2A  
|a{~Imz{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gkRbb   
{ J%SuiT$L&Y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ qEy]Rc%  
  SaveBmp(); ;rjd?r  
  return FALSE; G}ccf%  
} j c-$l  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 8AQ@?\Rc"2  
 CMenu pop; vAH`tPi>  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); KDEcR  
 CMenu*pMenu=pop.GetSubMenu(0); =*Ru 2  
 pMenu->SetDefaultItem(ID_EXITICON); H%^j yGS  
 CPoint pt; c$AwJhl^]  
 GetCursorPos(&pt); Jh!'"7  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); pon0!\ZT=  
 if(id==ID_EXITICON) wr{ [4$O  
  DeleteIcon(); K! e51P  
 else if(id==ID_EXIT) Ubf@"B  
  OnCancel(); '3eL^Aq  
 return FALSE; e=#'rDm  
} >cYYr@S  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); qOi"3_  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) MlmdfO%Y  
 AddIcon(); vpL3XYs`  
 return res; #V#sg}IhM?  
} _DAj$$ Ru4  
-FrNk>  
void CCaptureDlg::AddIcon() 3,[#%}1(S  
{ 2B`#c}PP  
 NOTIFYICONDATA data; 6&KvT2?tA`  
 data.cbSize=sizeof(NOTIFYICONDATA); j]5mzz~  
 CString tip; /@`kM'1:  
 tip.LoadString(IDS_ICONTIP); hUO&rov3@  
 data.hIcon=GetIcon(0); Ir\f _>7  
 data.hWnd=GetSafeHwnd(); -lDAxp6p  
 strcpy(data.szTip,tip); y)]L>o~  
 data.uCallbackMessage=IDM_SHELL; <-rw>,  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; }VI}O{  
 data.uID=98; I {&8iUN  
 Shell_NotifyIcon(NIM_ADD,&data); _oBJ'8R\  
 ShowWindow(SW_HIDE); &/-^D/ot  
 bTray=TRUE; @?E|]H!S]  
} || 0n%"h>i  
g*%z{w  
void CCaptureDlg::DeleteIcon() 'vc>uY  
{ `+?g96   
 NOTIFYICONDATA data; Htn''adg5  
 data.cbSize=sizeof(NOTIFYICONDATA); _&xi})E^O]  
 data.hWnd=GetSafeHwnd();  5i|DJ6  
 data.uID=98; :y%CP8  
 Shell_NotifyIcon(NIM_DELETE,&data); Q-7C'|  
 ShowWindow(SW_SHOW); b`yb{& ,?  
 SetForegroundWindow(); 9Impp5`/B  
 ShowWindow(SW_SHOWNORMAL); Oiz@tEp=_  
 bTray=FALSE; BfUM+RC%5  
} M`u&-6  
T\3a T  
void CCaptureDlg::OnChange() >xB[k-C4  
{ i0/RvrLc  
 RegisterHotkey(); f:hsE  
} XMpa87\  
:Y)jf  
BOOL CCaptureDlg::RegisterHotkey() +$y%H  
{ sjIUW$  
 UpdateData(); C(@#I7G  
 UCHAR mask=0; &Ay[mZQ 7  
 UCHAR key=0; ^T&@(|o  
 if(m_bControl) QMAineO  
  mask|=4; h}$g}f%$+  
 if(m_bAlt) ~dz,eB  
  mask|=2; m]Gxep0%  
 if(m_bShift) 1r?hRJ:'  
  mask|=1; !9p;%Ny`  
  key=Key_Table[m_Key.GetCurSel()]; c+A$ [  
 if(bRegistered){ b<bj5m4fz>  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); e !2SO*O  
  bRegistered=FALSE; [@;q#.}Z  
 } Z`]r)z%f  
 cMask=mask; Wb{0UkApJ  
 cKey=key; w _ONy9  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); kH'zTO1  
 return bRegistered; :}*   
} ATzFs]~K;  
?DrA@;IB  
  四、小结 tN1xZW:  
L'L[Vpx  
  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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