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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: q|ZQsFZ  
  P}Ule|&LK  
  一、实现方法 uI[lrMQYa  
IqONDdep9  
  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: P!2[#TL0  
,t>/_pI+=  
#pragma data_seg("shareddata") @AkD-}^[  
HHOOK hHook =NULL; //钩子句柄 W*|U  
UINT nHookCount =0; //挂接的程序数目 )c<5:c  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ;;- I<TL  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1  0bk094  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey !ly]{DTmm  
static int KeyCount =0; LaiUf_W#X  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 }vdhk0  
#pragma data_seg() =u`^QE  
uU00ZPS*G[  
  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。 X'>]z'0W  
7:T 5P  
  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: ;zvg]  %  
=Wk!mGc  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR u7<s_M3%N  
cKey,UCHAR cMask) A@"CrVE  
{ L pdp'9>I  
 BOOL bAdded=FALSE; m)?cXM  
 for(int index=0;index<MAX_KEY;index++){ eJ!a8   
  if(hCallWnd[index]==0){ D8Vb@5MW  
   hCallWnd[index]=hWnd; T|[ o  
   HotKey[index]=cKey; "n@=.x  
   HotKeyMask[index]=cMask; iPJZ%  
   bAdded=TRUE; 8[;U|SR"  
   KeyCount++; -xf=dzm)  
   break; (UTt_ry g  
  } &wZ:$lK#o  
 } p,9eZUGy  
 return bAdded;  G l*C"V  
} "I]% aK0  
//删除热键 yeNC-U<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5ff66CRw  
{ # 1,(I  
 BOOL bRemoved=FALSE; a4! AvG  
 for(int index=0;index<MAX_KEY;index++){ EkqsE$52  
  if(hCallWnd[index]==hWnd){ x3my8'h@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `W[oLQ  
    hCallWnd[index]=NULL; ]7^YPFc+  
    HotKey[index]=0; ef!V EtEOv  
    HotKeyMask[index]=0; BY$%gIB6>  
    bRemoved=TRUE; R('44v5JQp  
    KeyCount--; PTvP;  
    break; |nj%G<  
   } <H~  (iQ  
  } ZUMzWK5Th  
 } T{j&w%(z  
 return bRemoved; _>*$%R  
} ( UV8M\  
s?5(E}  
p]#%e0  
  DLL中的钩子函数如下: /\_ s  
#f@sq5pTO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) z>hG'  
{ ?ei7jM",  
 BOOL bProcessed=FALSE; QSy=JC9  
 if(HC_ACTION==nCode) /cDla5eej  
 { ` oYrW0Vm  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ' 7>V4\"  
   switch(wParam) PhM3?$  
   {  nK6{_Y>  
    case VK_MENU: :nw4K(:f  
     MaskBits&=~ALTBIT; avk0pY(n  
     break; W!z=AL{  
    case VK_CONTROL: f?_H02j`/E  
     MaskBits&=~CTRLBIT; nlK"2/W  
     break; -`B|$ W  
    case VK_SHIFT: O- &>Dc  
     MaskBits&=~SHIFTBIT; #2&_WM!   
     break; jQ_j#_Vle  
    default: //judge the key and send message dd>stp   
     break; :\48=>  
   } !K1[o'o#  
   for(int index=0;index<MAX_KEY;index++){ [>4Ou^=1  
    if(hCallWnd[index]==NULL) 1< ;<?  
     continue; :NO'[iE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dGcG7*EX  
    { (6 fh[eK86  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); xq.,7#3  
     bProcessed=TRUE; l>S~)FNwXJ  
    } ;Zc(qA  
   } $q{-)=-BXQ  
  } rRL:]%POT  
  else if((lParam&0xc000ffff)==1){ //有键按下 qI"@ PI!s  
   switch(wParam) Jpws1~  
   { Ah28D!Gor  
    case VK_MENU: ,`MUd0 n  
     MaskBits|=ALTBIT; xO6)lVd  
     break; grnlJ=  
    case VK_CONTROL: do%6P^ qA  
     MaskBits|=CTRLBIT; 2|Hq[c=~  
     break; 9#.nNv*z3  
    case VK_SHIFT: a%sr*`  
     MaskBits|=SHIFTBIT; ED @9,W0  
     break; Dw?nf  
    default: //judge the key and send message 7 rOziKZ"  
     break; NS;,(v{*N  
   } X[ }5hZcX  
   for(int index=0;index<MAX_KEY;index++){ uG2Hzav  
    if(hCallWnd[index]==NULL) J(VJMS;_  
     continue; c:4M|t=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *K'(t  
    { soXeHjNl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); x\GCsVy  
     bProcessed=TRUE; f 6Bx>lh  
    } ; 7[5%xM  
   } +hRAU@RA  
  } *obBo6!zM  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 gyJ$ Jp  
   for(int index=0;index<MAX_KEY;index++){ &mKtW$K` q  
    if(hCallWnd[index]==NULL) EV z>#GC  
     continue; 3Qfj=; 4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) )&<BQIv9/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); me#VCkr#  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 KZ pqbI Z  
   } Uoh!1_oV  
  } kb ]PW Oz  
 } CYmwT>P+*4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {xp/1? Mo*  
} vZmM=hW~  
U|={LU  
  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'I`_E  
3VbMW,_&"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); gN Xg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); b'4{l[3~nl  
{Tl5,CAz  
  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: kFW9@ !9  
\vXo~_-&  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {A2(a7vV  
{ 8TZNvN4u  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) _<|NVweFS  
 { 0{j] p^'<  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 u1xCn\  
  SaveBmp(); 0~Z >}(  
  return FALSE; Ro`9Ibqr  
 } yf*^Y74  
 …… //其它处理及默认处理 h W6og)x  
} & xo,49`!  
#HpF\{{v  
F$7>q'#  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 a_P8!pk+5  
>}%  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 j{U?kW{o  
9`81br+~  
  二、编程步骤 R$IxR=hMx  
'.r_6X$7Jt  
  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"; <spVUp  
fwK5p?Xhm  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ~oy =2Q<Z  
d`q<!qFZh  
  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; `h}fS4CO  
9q5jqFQ  
  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; X]d;x/2  
A}v! vVg  
  5、 添加代码,编译运行程序。 *]NG@^y  
;fw}<M!6  
三、程序代码 lk]q\yO_%  
U,Ya^2h%  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL (pN:ET B  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) a,i k=g  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ %wWJVq}jx  
#if _MSC_VER > 1000 :rd{y`59>&  
#pragma once D^8]+2r  
#endif // _MSC_VER > 1000 ^<49NUB>  
#ifndef __AFXWIN_H__ FD:3;nUY7  
#error include 'stdafx.h' before including this file for PCH M?l/_!QB  
#endif z{Z4{&M  
#include "resource.h" // main symbols \ :To\6\Ri  
class CHookApp : public CWinApp .R'<v^H  
{ ,RjE?M%  
 public: )voJq\Y)%  
  CHookApp(); S-l<+O1fy  
  // Overrides q#B=PZ'NA  
  // ClassWizard generated virtual function overrides Ut.%=o;&[  
  //{{AFX_VIRTUAL(CHookApp) m/@ ;N,K  
 public: 9.u}<m  
  virtual BOOL InitInstance(); 4zyN>f|  
  virtual int ExitInstance(); OGW,[k= 2{  
  //}}AFX_VIRTUAL A!B: vJ  
  //{{AFX_MSG(CHookApp) /9T.]H ~  
  // NOTE - the ClassWizard will add and remove member functions here. _)-t#Ve  
  // DO NOT EDIT what you see in these blocks of generated code ! fUj[E0yOF  
  //}}AFX_MSG dt&m YSZ}  
  DECLARE_MESSAGE_MAP() n-zAkKM  
}; T%74JRQ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ~(i#A>   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >-U'mkIH  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3L}eF g,d  
BOOL InitHotkey(); '. 5&Z  
BOOL UnInit();  +~xY}  
#endif s^f7w  
K#Ia19au5  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. yp}J+/PX}  
#include "stdafx.h" QS7<7+  
#include "hook.h" wW &q)WOi  
#include <windowsx.h> hOFC8g  
#ifdef _DEBUG _y:-_q  
#define new DEBUG_NEW )Fk*'6  
#undef THIS_FILE 9o%k [n  
static char THIS_FILE[] = __FILE__; e1cqzhI=nA  
#endif HiAj3  
#define MAX_KEY 100 7PTw'+{  
#define CTRLBIT 0x04 ) uM*`%  
#define ALTBIT 0x02 6Qtyv  
#define SHIFTBIT 0x01 jW]Q-  
#pragma data_seg("shareddata") BoJpf8e'-e  
HHOOK hHook =NULL; bu0i #  
UINT nHookCount =0; |5il5UP  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey &/dYJv$[9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT x[u4>f  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 1 S<E=7  
static int KeyCount =0; ob3)bI oM  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Fnqj^5  
#pragma data_seg() |D*a"*1+A  
HINSTANCE hins; ^^ >j2=  
void VerifyWindow(); R+sv?4k  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) V.w L  
//{{AFX_MSG_MAP(CHookApp) S\76`Ot  
// NOTE - the ClassWizard will add and remove mapping macros here. p : {,~ 1  
// DO NOT EDIT what you see in these blocks of generated code! /]U),LbN  
//}}AFX_MSG_MAP %f)%FN . S  
END_MESSAGE_MAP() / R-1s  
h2jrO9  
CHookApp::CHookApp() J497 >w[  
{ Vh?5  
 // TODO: add construction code here, _tlr8vL  
 // Place all significant initialization in InitInstance hTc :'vq  
} E!A+J63zsw  
q$7w?(Lk  
CHookApp theApp; hZIbN9)8A  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) h\T}$jgfWm  
{ dzk1!yy  
 BOOL bProcessed=FALSE; .R^R32ln  
 if(HC_ACTION==nCode) =W*Ro+wWb  
 { mX/'Fta  
  if((lParam&0xc0000000)==0xc0000000){// Key up -M6#,Ji  
   switch(wParam) LbkQuq/d  
   { ppuJC ' GW  
    case VK_MENU: Y sDai<  
     MaskBits&=~ALTBIT; %y)]Q|  
     break;  sWyx_  
    case VK_CONTROL: F4NM q&_  
     MaskBits&=~CTRLBIT; 'QSj-  
     break; =Q,D3F -+f  
    case VK_SHIFT: bV$g]->4e  
     MaskBits&=~SHIFTBIT; uK%0,!q  
     break; ?%cZO "  
    default: //judge the key and send message g& ou[_A  
     break; /Qu<>#[?  
   } L,yq'>*5s  
   for(int index=0;index<MAX_KEY;index++){ 5{gv \S1  
    if(hCallWnd[index]==NULL) U(+%iD60i  
     continue; g '+2bQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zYxA#TZL  
    { Ts\PZQ!q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); vs^)=  
     bProcessed=TRUE; g#Z7ReMw  
    } =qvn?I^/  
   } <S^Hy&MD>  
  } ux8K$$$  
  else if((lParam&0xc000ffff)==1){ //Key down o)wOXF  
   switch(wParam) 1@t8i?:h  
   { v4]#Nc$~T  
    case VK_MENU: ),>whCtsI  
     MaskBits|=ALTBIT; wwNkJ+  
     break; c!kzwc(  
    case VK_CONTROL: %x./>-[t  
     MaskBits|=CTRLBIT; +TW,!.NBG  
     break; tUksIUYD\  
    case VK_SHIFT: Cp?6vu|RA  
     MaskBits|=SHIFTBIT; "#:h#uRUb  
     break; ~tLvD[n[  
    default: //judge the key and send message C1#f/o->  
     break; ki'<qa  
   } = Rn  
   for(int index=0;index<MAX_KEY;index++) RDU 'l^  
   { HBNX a  
    if(hCallWnd[index]==NULL) |hS^eK_  
     continue; _1jbNQa  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aI>F8R?  
    { !gL1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); G?^w <  
     bProcessed=TRUE; z5_jx&^Z  
    } DoNN;^H  
   } TyvUdU  
  } Qe0?n  
  if(!bProcessed){ _H@8qR  
   for(int index=0;index<MAX_KEY;index++){ (QdLz5\  
    if(hCallWnd[index]==NULL) [s[!PlazX  
     continue; )xL_jSyh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) tb>Q#QB&u  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); F=?GV\Tw  
   } "!Nu A  
  } _&N:%;9uD  
 } *Z+U}QhHD6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2q UX"a4  
} u/CR7Y  
T2A74>Nw  
BOOL InitHotkey() 8 .&P4u i  
{ /!_FE+  
 if(hHook!=NULL){ J|@O4 g   
  nHookCount++; .zy2_3:  
  return TRUE; /uPMzl  
 } #3O$B*gV6  
 else &gP1=P,!  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ;Za^).=  
  if(hHook!=NULL) 9 ge'Mo  
   nHookCount++; lmIphOUoIw  
  return (hHook!=NULL); u`XZtF<vf  
} gk}.L E  
BOOL UnInit() LWxP}? =  
{ S#0C^  
 if(nHookCount>1){ &Z}}9dd  
  nHookCount--; pf#R]  
  return TRUE; Abpzf\F  
 } kaRjv   
 BOOL unhooked = UnhookWindowsHookEx(hHook); *c( J4  
 if(unhooked==TRUE){ W6)XMl}n  
  nHookCount=0; x&N@R?AG1  
  hHook=NULL; m;sYg  
 } UZL-mF:)&  
 return unhooked; .G}$jO}  
} @7sHFwtar?  
,D.@6 bJW  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2h) *  
{ bWZ oGFT  
 BOOL bAdded=FALSE; 'N&s$XB,  
 for(int index=0;index<MAX_KEY;index++){ :4>LtfA  
  if(hCallWnd[index]==0){ @sRb1+nn  
   hCallWnd[index]=hWnd; ?i\$U'2*z3  
   HotKey[index]=cKey; }5d|y*  
   HotKeyMask[index]=cMask; :2lM7|@/  
   bAdded=TRUE; EkOn Rm_hn  
   KeyCount++; dCWq~[[  
   break; T2to!*T  
  } 'h> l_A  
 } i7?OZh*f  
 return bAdded; 4)9Pgp :  
} { !t6& A  
OYOczb]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) BO 3z$c1yU  
{ ^C8f(  
 BOOL bRemoved=FALSE; -}5dZ;  
 for(int index=0;index<MAX_KEY;index++){ 0 d2to5 (  
  if(hCallWnd[index]==hWnd){ "9RW<+  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Zf?jnDA  
    hCallWnd[index]=NULL; 'l1cuAP!+  
    HotKey[index]=0; InG<B,/W?  
    HotKeyMask[index]=0; ^Uldyv/  
    bRemoved=TRUE; K&&YxX~ 3  
    KeyCount--; ]2z Gb5s"  
    break; NV^n}]ci  
   } ?o d*"M  
  } 1! R:}r3t  
 } QjsN7h&%  
 return bRemoved; pS!N<;OWr  
} b~+\\,q}  
2!a~YT  
void VerifyWindow() \qbEC.-K  
{ /j:-GJb*!u  
 for(int i=0;i<MAX_KEY;i++){ (k %0|%eR  
  if(hCallWnd!=NULL){ L ~$&+g  
   if(!IsWindow(hCallWnd)){ V/8yW3]Xy  
    hCallWnd=NULL; <h~_7Dn  
    HotKey=0; "'c =(P  
    HotKeyMask=0; sv*xO7D.  
    KeyCount--; h-@_.&P0e  
   } a{iG0T.{Yh  
  } c+u) C%g  
 } e pAC%a  
} -vS7%Fbr  
2J7JEv|  
BOOL CHookApp::InitInstance() o&E2ds3  
{ vFGVz  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); CHM+@lD  
 hins=AfxGetInstanceHandle(); GV SVNT}I  
 InitHotkey(); Y;8.(0r/  
 return CWinApp::InitInstance(); BeM|1pe.  
} cs)z!  
pB79#4  
int CHookApp::ExitInstance() I\VC2U  
{ T(bFn?  
 VerifyWindow(); 3q1u9`4;  
 UnInit(); V7>{,  
 return CWinApp::ExitInstance(); <V*M%YWs  
} ;<v9i#K5  
oFS)3.  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Z9lfd6MU,  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) OSCeTkR  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ v&u8Ks  
#if _MSC_VER > 1000 =A^VzIj(  
#pragma once {FM:\/  
#endif // _MSC_VER > 1000 8KS9!*.iZ  
qC YXkZ%`  
class CCaptureDlg : public CDialog N:rnH:g+:  
{ 12yX`9h>  
 // Construction r/6h}  
 public: tJ9`Ys  
  BOOL bTray; O0> ^?dsL  
  BOOL bRegistered; _6'HBE  
  BOOL RegisterHotkey(); _qhYG1t  
  UCHAR cKey; ,9ZN k@q  
  UCHAR cMask; w77"?kJ9X  
  void DeleteIcon(); i9y&<^<W  
  void AddIcon(); Y&`nB,'  
  UINT nCount; btU:=6  
  void SaveBmp(); 2o-Ie/"d\  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor )V*V  
  // Dialog Data }Gm/9@oKc  
  //{{AFX_DATA(CCaptureDlg) ,46k8%WW  
  enum { IDD = IDD_CAPTURE_DIALOG }; <o\I C?A  
  CComboBox m_Key; =Qw`F0t  
  BOOL m_bControl; sMAu*  
  BOOL m_bAlt; =ZN~*HLl}  
  BOOL m_bShift; ]+i~Cbj  
  CString m_Path; vh^,8pPy  
  CString m_Number; VBI~U?0  
  //}}AFX_DATA b$'}IWNV  
  // ClassWizard generated virtual function overrides a(`@u&]WZ  
  //{{AFX_VIRTUAL(CCaptureDlg) i9k/X&V  
 public: .TetN}w  
  virtual BOOL PreTranslateMessage(MSG* pMsg); SiQszV.&  
 protected: [O(8iz v  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ].<B:]:,  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); @I|gA  
  //}}AFX_VIRTUAL bT{iei]?  
  // Implementation F]~>qt<ia  
 protected: gEU|Bx/!=  
  HICON m_hIcon; sYb(g'W*'  
  // Generated message map functions ;-X5#  
  //{{AFX_MSG(CCaptureDlg) + %07J6  
  virtual BOOL OnInitDialog(); eo&nAr  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Ox1#}7`0>  
  afx_msg void OnPaint(); Do5)ilt  
  afx_msg HCURSOR OnQueryDragIcon(); *R6Ed  
  virtual void OnCancel(); :;]iUjiC8  
  afx_msg void OnAbout(); cfd7)(6  
  afx_msg void OnBrowse(); T#e ;$\  
  afx_msg void OnChange(); 7B,a xkr  
 //}}AFX_MSG &udlt//^%  
 DECLARE_MESSAGE_MAP() * "Z5bKL  
}; [<M~6]  
#endif Q)s[ls  
^p 4 33  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Q4,!N(>D  
#include "stdafx.h" 3ud_d>  
#include "Capture.h" Wc+)EX~KS  
#include "CaptureDlg.h" >FabmIcC  
#include <windowsx.h> K`?",G?_  
#pragma comment(lib,"hook.lib") Q-}yZ  
#ifdef _DEBUG {"uLV{d  
#define new DEBUG_NEW %nfaU~IqK  
#undef THIS_FILE kq kj.#u  
static char THIS_FILE[] = __FILE__; V>&WZY  
#endif d}t7bgk'j  
#define IDM_SHELL WM_USER+1 >3a<#s{%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (}u2) 9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]l WEdf+  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _c 4kj  
class CAboutDlg : public CDialog 93*MY7j}  
{ ;NHZD  
 public: $ kA'9Y  
  CAboutDlg(); cn$o$:tW  
  // Dialog Data RHc-kggk!  
  //{{AFX_DATA(CAboutDlg) V94eUmx>?+  
  enum { IDD = IDD_ABOUTBOX }; %cl=n!T  
  //}}AFX_DATA j%m9y_rg}  
  // ClassWizard generated virtual function overrides `'Af`u\R  
  //{{AFX_VIRTUAL(CAboutDlg) )E.!jL:g  
 protected: rVE!mi]%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support MM*B.y~TxZ  
  //}}AFX_VIRTUAL .A. VOf_  
  // Implementation "[rChso  
 protected: Hq*\,`b&  
  //{{AFX_MSG(CAboutDlg) uwcm%N;I"  
  //}}AFX_MSG Gb\Nqx(  
  DECLARE_MESSAGE_MAP() 8AK=FX&@&  
}; 0Y81B;/F  
}9GD'N?4  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |ZAR!u&0  
{ + S^OzCGk  
 //{{AFX_DATA_INIT(CAboutDlg) (HW!!xM  
 //}}AFX_DATA_INIT J7`fve  
} }j/($,  
#MyR:V*a  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) s?8vs%(l  
{ W'BB FG  
 CDialog::DoDataExchange(pDX); SCCBTpmf2B  
 //{{AFX_DATA_MAP(CAboutDlg)  a9ko3L  
 //}}AFX_DATA_MAP ")t ^!x(v  
} NYoh6AR  
s^@?+<4:  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Sd !!1a s  
 //{{AFX_MSG_MAP(CAboutDlg) #JFTD[1  
 // No message handlers 3$u 3ssOL  
 //}}AFX_MSG_MAP n\v;4ly^  
END_MESSAGE_MAP() E*!  
[<+A?M=  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 5v f?E"\r  
: CDialog(CCaptureDlg::IDD, pParent) Vy:I[@6@+  
{ rfgkw  
 //{{AFX_DATA_INIT(CCaptureDlg) l$PSID  
  m_bControl = FALSE; ^]&uMkPN  
  m_bAlt = FALSE; )]/gu\90  
  m_bShift = FALSE; kPm{tc  
  m_Path = _T("c:\\"); ETw7/S${  
  m_Number = _T("0 picture captured."); hGPo{>xR  
  nCount=0; mIK-a{?G  
  bRegistered=FALSE; TzC'x WO  
  bTray=FALSE; Ua>lf8w<  
 //}}AFX_DATA_INIT &Hb;; Ic(  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 7*9a`p3w  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); lTe7n'y^^  
} KxZO.>,  
`K,{Y_  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 8 z) K  
{ CWP),]#n  
 CDialog::DoDataExchange(pDX); o=t@83Fh5  
 //{{AFX_DATA_MAP(CCaptureDlg) \>T+\?M  
  DDX_Control(pDX, IDC_KEY, m_Key); `OL@@`'^{S  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Xu4C*]A>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); g>m)|o'  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); _6b?3[Xz  
  DDX_Text(pDX, IDC_PATH, m_Path); \{Q d  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Kw`{B3"  
 //}}AFX_DATA_MAP 0W92Z@_GY  
} ,cgFdOM.  
1G0U}-6RH  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) MX@t[{Gg9  
//{{AFX_MSG_MAP(CCaptureDlg) :!SVpCt3  
 ON_WM_SYSCOMMAND() Wchu-]  
 ON_WM_PAINT() toq/G,N Q  
 ON_WM_QUERYDRAGICON() @H{QHi  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) NUlp4i~Q  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) D5o[z:V7"  
 ON_BN_CLICKED(ID_CHANGE, OnChange) S>-x<'Os  
//}}AFX_MSG_MAP Z*+0gJ<Y  
END_MESSAGE_MAP() i `m&X6)\j  
?ztI8 I/  
BOOL CCaptureDlg::OnInitDialog() BB x359  
{ XX85]49`%  
 CDialog::OnInitDialog(); BGtr=&Hq  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); B6N/nCvHK  
 ASSERT(IDM_ABOUTBOX < 0xF000); SdOa#U)  
 CMenu* pSysMenu = GetSystemMenu(FALSE); )\ `AD#  
 if (pSysMenu != NULL) zTgY=fuz  
 { j20/Q)=h  
  CString strAboutMenu; Lro[ |A  
  strAboutMenu.LoadString(IDS_ABOUTBOX); V`c"q.8  
  if (!strAboutMenu.IsEmpty()) W'|NYw_B  
  { :]Nn(},  
   pSysMenu->AppendMenu(MF_SEPARATOR); :%6OFO$z  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); eb6Ux  
  }  n[vwwY  
 } <>n-+Kr  
 SetIcon(m_hIcon, TRUE); // Set big icon I~^t\iujs  
 SetIcon(m_hIcon, FALSE); // Set small icon 3 291"0  
 m_Key.SetCurSel(0); F9ys.Bc  
 RegisterHotkey(); Frn<~  
 CMenu* pMenu=GetSystemMenu(FALSE); -YDA,.Ic?  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 0}'xoYv f  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); XniPNU  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); JPH! .@  
 return TRUE; // return TRUE unless you set the focus to a control <r9L-4  
} '|I8byiK  
xRX2u_f$<  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) jR1o<]?  
{ J0ys Z]  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) lOp7rW]$  
 { O$qxo &  
  CAboutDlg dlgAbout; C+0MzfLgf  
  dlgAbout.DoModal(); KKBrw+)AJ  
 } B(pxyv)  
 else f`$F^=  
 { ,4Q1[K35B  
  CDialog::OnSysCommand(nID, lParam); 3WVH8Sb  
 } Fy; sVB  
} ,Y:ET1:  
fY4I(~Q  
void CCaptureDlg::OnPaint() ~ u)} /  
{ W)_|jpd[  
 if (IsIconic()) Bj=lUn`T:  
 { = 9Ow!(!@  
  CPaintDC dc(this); // device context for painting x|b52<dLL&  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); %O69A$Q[m  
  // Center icon in client rectangle 8l1s]K qr  
  int cxIcon = GetSystemMetrics(SM_CXICON); 1fK]A*{p  
  int cyIcon = GetSystemMetrics(SM_CYICON); 43VBx<"  
  CRect rect; NJNS8\4  
  GetClientRect(&rect); _%@dlT?  
  int x = (rect.Width() - cxIcon + 1) / 2; HUA{ P%  
  int y = (rect.Height() - cyIcon + 1) / 2; bu?4$O  
  // Draw the icon L">\c5ca  
  dc.DrawIcon(x, y, m_hIcon);  )>=!</@  
 } o2 ;  
 else jIL+^{K<  
 { O .ESI  
  CDialog::OnPaint(); %eE0a4^".  
 } tD~ n PbbB  
} ( < e q[(  
6e;POW  
HCURSOR CCaptureDlg::OnQueryDragIcon() ;p(I0X  
{ 2q NA\-0i>  
 return (HCURSOR) m_hIcon; [.(,v n?6  
} |JL?"cc  
^ Fnag]qQ  
void CCaptureDlg::OnCancel() W ZT) LYA  
{ YYN'LF#j  
 if(bTray) 4St-Q]Y _  
  DeleteIcon(); &-$27  
  CDialog::OnCancel(); 4,P(w+  
} VnYcqeCm  
/szwVA  
void CCaptureDlg::OnAbout() A_\`Gj!s%  
{ 68UfuC  
 CAboutDlg dlg; sTxgU !_  
 dlg.DoModal(); xZ]QT3U+  
} +n%d,Pz  
@DNwzdP  
void CCaptureDlg::OnBrowse() Y#5v5  
{ J2Mq1*Vpq  
 CString str; {E;oirv&  
 BROWSEINFO bi; ri`;   
 char name[MAX_PATH]; N>H#Ew@2U  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); (KLhF  
 bi.hwndOwner=GetSafeHwnd(); EzeU-!|W  
 bi.pszDisplayName=name;  :I{9k~  
 bi.lpszTitle="Select folder"; Ygbyia|  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; [ [#R ry  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); B1V+CP3t  
 if(idl==NULL) 3#0y.. F  
  return; UQg_y3 #V  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); #`ZBA>FLaQ  
 str.ReleaseBuffer(); .k-t5d  
 m_Path=str; 1I awi?73  
 if(str.GetAt(str.GetLength()-1)!='\\') q@^^jlHP  
  m_Path+="\\"; |vw],r6  
 UpdateData(FALSE); <N:)Xf9`  
}  6oI/*`>  
K))P 2ss  
void CCaptureDlg::SaveBmp() P6I<M}p  
{ %L|xmx!c  
 CDC dc; sU+8'&vBp  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;X N Ahg7  
 CBitmap bm; 8OMMV,QF  
 int Width=GetSystemMetrics(SM_CXSCREEN); jLA)Y [h  
 int Height=GetSystemMetrics(SM_CYSCREEN); 9X&=?+f  
 bm.CreateCompatibleBitmap(&dc,Width,Height);  sd"eu  
 CDC tdc; Hr7?#ZX;e  
 tdc.CreateCompatibleDC(&dc); ;Dbx5-t  
 CBitmap*pOld=tdc.SelectObject(&bm); O#k eoC4  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); (5;nA'  
 tdc.SelectObject(pOld); N^M6*,F,J  
 BITMAP btm; &lgzNC9g%  
 bm.GetBitmap(&btm); id9XwWV  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; lGt:.p{NG  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); D59q/@  
 BITMAPINFOHEADER bih; yEos$/*u-N  
 bih.biBitCount=btm.bmBitsPixel; |~ytAyw  
 bih.biClrImportant=0; dC;&X g`  
 bih.biClrUsed=0; ts% n tnvI  
 bih.biCompression=0; &Dt=[yqeG  
 bih.biHeight=btm.bmHeight; m] yUcj{F  
 bih.biPlanes=1;  .^2.h  
 bih.biSize=sizeof(BITMAPINFOHEADER); ZXN`8!]&  
 bih.biSizeImage=size; `-e9#diQe  
 bih.biWidth=btm.bmWidth; ^s#+`Y05/  
 bih.biXPelsPerMeter=0; BNF*1JO  
 bih.biYPelsPerMeter=0; 6oq5CDoq  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); gj iFpW4  
 static int filecount=0; m[%':^vSr  
 CString name; ?6\N&MTF  
 name.Format("pict%04d.bmp",filecount++); mK/E1a)AG3  
 name=m_Path+name; ?lfyC/  
 BITMAPFILEHEADER bfh;  iDx(qdla  
 bfh.bfReserved1=bfh.bfReserved2=0; pN)x,<M)  
 bfh.bfType=((WORD)('M'<< 8)|'B'); <CB%e!~.9  
 bfh.bfSize=54+size; &Nh zEl1  
 bfh.bfOffBits=54; k ~Q 5Cs  
 CFile bf; '7}2}KD  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ q7r b3d  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Td|u-9OM  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Rc3!u^?u  
  bf.WriteHuge(lpData,size); 4x}U+1B  
  bf.Close(); cIQbu#[@  
  nCount++; 8AuE:=?,,  
 } MGq\\hLD\-  
 GlobalFreePtr(lpData); ]R>NmjAI  
 if(nCount==1) _BY+Tfol  
  m_Number.Format("%d picture captured.",nCount);  4Y}Nu  
 else IdMwpru(  
  m_Number.Format("%d pictures captured.",nCount); 'sXrtl7{^  
  UpdateData(FALSE); YXZP-=fB>i  
} g4Q' Fub+I  
P(FlU]q  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5|~nX8>  
{ 6K )K%a,9  
 if(pMsg -> message == WM_KEYDOWN) B=;kC#Emtf  
 { Dkb`_HI  
  if(pMsg -> wParam == VK_ESCAPE) kYWnaY ^F  
   return TRUE; zc=G4F01  
  if(pMsg -> wParam == VK_RETURN) {]cr.y]\  
   return TRUE; C7G,M  
 } G3`9'-2q@c  
 return CDialog::PreTranslateMessage(pMsg); .%)uCLZr$  
} x/CM)!U)  
P 4t@BwU$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6Q\|8a  
{ F\&{>&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \+nV~Pi"A  
  SaveBmp(); &tvtL  
  return FALSE; z?Ok'LX  
} >e& L"  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 71%$&6  
 CMenu pop; ;/_htdj  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Y#Q!mbp  
 CMenu*pMenu=pop.GetSubMenu(0); [OTn>/W'  
 pMenu->SetDefaultItem(ID_EXITICON); zwU[!i)  
 CPoint pt; T9%|B9FeJ  
 GetCursorPos(&pt); $'>JG9M  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); |U;O HS  
 if(id==ID_EXITICON) 8 AFc=Wx  
  DeleteIcon(); Hi=</ Wy;  
 else if(id==ID_EXIT) j5Da53c#^  
  OnCancel(); 4_iA<}>|  
 return FALSE; 1<1+nGO  
} GS=E6  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); x>B\2;  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ^\Z+Xq1~/  
 AddIcon(); [T,^l#S1  
 return res; eUZk|be  
} #) :.1Z?  
%cg| KB"l  
void CCaptureDlg::AddIcon() .{c7 I!8  
{ =]-z?O6^`  
 NOTIFYICONDATA data; ye=4<b_  
 data.cbSize=sizeof(NOTIFYICONDATA); A-:k4] {%P  
 CString tip; KpYezdPF)  
 tip.LoadString(IDS_ICONTIP); ~v;+-*t  
 data.hIcon=GetIcon(0); zG<<MR/<  
 data.hWnd=GetSafeHwnd(); tuIZYp8tIN  
 strcpy(data.szTip,tip); ,pI9=e@O/z  
 data.uCallbackMessage=IDM_SHELL; HUD0 @HQI  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; J<+ f7L  
 data.uID=98; /{`"X_.o  
 Shell_NotifyIcon(NIM_ADD,&data); &.?E[db"h  
 ShowWindow(SW_HIDE); tm5)x^7  
 bTray=TRUE; `*B0n>ol,  
} d1\nMm}v  
" (O3B  
void CCaptureDlg::DeleteIcon() )dX(0E4Td/  
{ #+l`tj4b/  
 NOTIFYICONDATA data; ZSK_Lux>  
 data.cbSize=sizeof(NOTIFYICONDATA); c'tQA  
 data.hWnd=GetSafeHwnd(); #:0-t!<0C  
 data.uID=98; ;veD?|  
 Shell_NotifyIcon(NIM_DELETE,&data); J_Tz\bZ3)  
 ShowWindow(SW_SHOW); dt:$:,"   
 SetForegroundWindow(); cjPXrDl{\  
 ShowWindow(SW_SHOWNORMAL); 3k9n*jY0  
 bTray=FALSE; ap )B%9  
} Uzzm2OS`  
s$>n U  
void CCaptureDlg::OnChange() <^Vj1s  
{ :=;{w~D  
 RegisterHotkey(); }R#W<4:  
} QHZ",1F  
xmcZN3 ){+  
BOOL CCaptureDlg::RegisterHotkey() vio>P-2Eho  
{ f\dfKNm6  
 UpdateData(); v.Q#<@B^:  
 UCHAR mask=0; v;e8W9M  
 UCHAR key=0; Jg[Ao#,==  
 if(m_bControl) =/46;844T  
  mask|=4; vuPNru" 2  
 if(m_bAlt) W6i{ yne W  
  mask|=2; C h>F11kC  
 if(m_bShift) iBAP,cR?`  
  mask|=1; 2=Naq Ht(  
  key=Key_Table[m_Key.GetCurSel()]; /m"/#; ^l  
 if(bRegistered){ <A)M^,#o  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); *PnO$q@`  
  bRegistered=FALSE; B F<u3p??  
 } `"&Nw,C  
 cMask=mask; A_oZSUrR  
 cKey=key; jW`JThoq  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 4($"4>BA  
 return bRegistered; n_km]~  
} ? /z[Jx.  
vHpw?(]  
  四、小结 (?\+  
5\bGCf  
  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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