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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: d/}SAvtt  
  `;YU.*  
  一、实现方法 50 A^bbid  
\`ZW* EtPI  
  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: %lX%8Z$v  
:5/Uh/sX  
#pragma data_seg("shareddata") CiR%Ujf  
HHOOK hHook =NULL; //钩子句柄 |A%<Z(  
UINT nHookCount =0; //挂接的程序数目 MWNPPYww  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 <" @zn  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 L{E^?iX  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey bW ZbG{Y.  
static int KeyCount =0; >|6iR%"f#  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 x+]!m/  
#pragma data_seg() @Kf_z5tm:  
|ou b!fG4  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 % aUsOB-RV  
NxVw!TsR  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: RNPbH.  
cpt<WK}  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR );*YQmdx'  
cKey,UCHAR cMask) ?:|-Dq,  
{ R.LL#u};  
 BOOL bAdded=FALSE; l88A=iLgv  
 for(int index=0;index<MAX_KEY;index++){ <xJ/y|{  
  if(hCallWnd[index]==0){ 4d_s%n?C  
   hCallWnd[index]=hWnd; w'X]M#Q><  
   HotKey[index]=cKey; =<@\,xN>C  
   HotKeyMask[index]=cMask; }tPk@$  
   bAdded=TRUE; $ n,Z  
   KeyCount++; YUQtMf9  
   break;  KluA  
  } 9'x)M?{8  
 } [TF8'jI0  
 return bAdded; [+w3J#K  
} b dJ+@r  
//删除热键 {B*W\[ns  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) B/Gd(S`@q  
{ ES<{4<Kpx  
 BOOL bRemoved=FALSE; okq[ o90  
 for(int index=0;index<MAX_KEY;index++){ O:#+%  
  if(hCallWnd[index]==hWnd){ H0a/(4/xg  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =e><z9hY  
    hCallWnd[index]=NULL; J ti(b*~  
    HotKey[index]=0; )' xETA  
    HotKeyMask[index]=0; * n(> ^  
    bRemoved=TRUE; .+y>8h3{  
    KeyCount--; +pH@oFNK  
    break; m-T~fJ  
   } 0Q593F  
  } bXYA5wG  
 } @c'|Iqy`  
 return bRemoved; AGYm';z3  
} i`)!X:j  
6zIgQ4Bp24  
j%<}jw[2  
  DLL中的钩子函数如下: /,5Z-Z*wq  
}<MR`h1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9umGIQHnil  
{ f>$h@/-*  
 BOOL bProcessed=FALSE; ]WJfgN4  
 if(HC_ACTION==nCode) 4c~>ci,N?(  
 { nzX@:7g  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 RV-hIdAU  
   switch(wParam) gLL-VvJ[  
   {  92dF`sv  
    case VK_MENU: \g-j9|0  
     MaskBits&=~ALTBIT; WW@"Z}?k  
     break; e=/&(Y  
    case VK_CONTROL: ,/&Zw01dGN  
     MaskBits&=~CTRLBIT; K8^kJSF\  
     break; 1'6cGpZY  
    case VK_SHIFT: -%IcYzyA  
     MaskBits&=~SHIFTBIT; i(2y:U3[@  
     break; m:`@?n~..  
    default: //judge the key and send message c\cZ]RZ  
     break; TUp%FJXA|  
   } f?Bj _z  
   for(int index=0;index<MAX_KEY;index++){ z&nZ<ih  
    if(hCallWnd[index]==NULL) Jd 3@cLCe-  
     continue; *QE<zt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kpfwqHT  
    { 0? bA$y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); KSs1CF'i  
     bProcessed=TRUE; s[3fqdLP&  
    } ,*,sw:=2  
   } i4Z4xTn  
  } US?Rr  
  else if((lParam&0xc000ffff)==1){ //有键按下 Kf7WcJ4b  
   switch(wParam) Y'"N"$n'_  
   { FT\?:wpKa  
    case VK_MENU: ,ul5,ygA  
     MaskBits|=ALTBIT; $v;dV@tB  
     break; WXUkuO  
    case VK_CONTROL: ,8K'F  
     MaskBits|=CTRLBIT; &m{'nRU}c  
     break; _Sj}~ H  
    case VK_SHIFT: x%BF {Sw  
     MaskBits|=SHIFTBIT; *07sK1wW  
     break; )c tr"&-  
    default: //judge the key and send message 6p<`h^  
     break; HD# r0)  
   } }VRv sZ  
   for(int index=0;index<MAX_KEY;index++){ 2z2`  
    if(hCallWnd[index]==NULL) cwtD@KC[B  
     continue; setL dEi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #n})X,ip2  
    { z?.(3oLT  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); V 7<eQ0;m  
     bProcessed=TRUE; CJ w$j`k  
    } z-u?s`k**  
   } i+(GNcg2  
  } K}x/ BhE+  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 H7IW"UkBR  
   for(int index=0;index<MAX_KEY;index++){ o'UHStk  
    if(hCallWnd[index]==NULL) i2F(GH?p[  
     continue; e6P[c=m #  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $B _Nc*_e  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ^Vo"fI`=C  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 F1u)i  
   } != zx  
  } >!BFt$sd  
 } M9"Sgb`g  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !$kR ;Q"/  
} W);W.:F  
|`]oc,1h@  
  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: Di.;<v#FL  
qZ\ L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); YOw?'+8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); i>GdRG&q  
<aVfJd/fT  
  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:  X4I]9 t\  
6"%qv`.Fp  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +i)AS0?d  
{ 1xC`ZhjcD  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) euZ(}+N&  
 { !J# .!}3  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 `p|[rS>  
  SaveBmp(); C_-E4I Z)  
  return FALSE; VK4/82@5  
 } qY}Cg0[@g  
 …… //其它处理及默认处理 S:Xs '0K_  
} 84Zgo=P}  
uC[d%v`  
a|.20w5  
  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。 l\aUresm  
QNJ\!+,HV  
  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。 x u,htx  
4<Kgmy  
  二、编程步骤 eBvW#Hzp  
+S0u=u65  
  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"; 3U o]> BG  
\^s2W:c  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Z:^3Fm->+  
sY^lQN  
  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; wT% "5:  
GC?S];PL  
  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; ^H'kHl'F  
@ RX`>r{_  
  5、 添加代码,编译运行程序。 #S *pD?VZ  
=M7PvH'"  
三、程序代码 cuMc*i$w!  
U#"WrWj  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL \CwtX(6.  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) oek #^:pF  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ FK3Whe{KP{  
#if _MSC_VER > 1000 w>vmF cp  
#pragma once PvuAg(?  
#endif // _MSC_VER > 1000 Z fqQ {_  
#ifndef __AFXWIN_H__ xv&S[=Dt  
#error include 'stdafx.h' before including this file for PCH $2is3;h  
#endif <vLdBfw&N  
#include "resource.h" // main symbols /pU|ZA.z'2  
class CHookApp : public CWinApp F7V6-V{_  
{ IadK@?X6j  
 public: V0S6M^\DK  
  CHookApp(); ;,v.(Z ic  
  // Overrides )1K! [ W}t  
  // ClassWizard generated virtual function overrides 5Abz 5-^KH  
  //{{AFX_VIRTUAL(CHookApp) ~R$[n.Vpk  
 public: Ri[S<GOMii  
  virtual BOOL InitInstance(); 15JsmA*Q  
  virtual int ExitInstance(); qkiJ HT  
  //}}AFX_VIRTUAL n{z8Ao%  
  //{{AFX_MSG(CHookApp) mDlCt_h  
  // NOTE - the ClassWizard will add and remove member functions here. b.@H1L  
  // DO NOT EDIT what you see in these blocks of generated code ! =!YP$hfY  
  //}}AFX_MSG wn{]#n=|l  
  DECLARE_MESSAGE_MAP() gINwvzW{  
}; ,,Jjr[A_j  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 4*H(sq  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b24di  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); f%L:<4  
BOOL InitHotkey(); 7x%S](m%  
BOOL UnInit(); xl|ghjn  
#endif ~ t"n%SgY  
qT"drgpi3  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. T<XfZZ)l<`  
#include "stdafx.h" R !Fx)xj  
#include "hook.h" XRtyC4f  
#include <windowsx.h> xSx&79Ez<*  
#ifdef _DEBUG :ao^/&HZ  
#define new DEBUG_NEW gO9'q='5l  
#undef THIS_FILE prqyoCfq  
static char THIS_FILE[] = __FILE__; `!<x"xKu  
#endif O(WEgz  
#define MAX_KEY 100 Ko4)0&  
#define CTRLBIT 0x04 ?ISI[hoc  
#define ALTBIT 0x02 A\Lr<{Jh  
#define SHIFTBIT 0x01 5Ws5X_?d  
#pragma data_seg("shareddata") -e &$,R>;  
HHOOK hHook =NULL; -<]\l3E&J  
UINT nHookCount =0; =.VepX|?D  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey }!eF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT H U:1f)a a  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 2;3x,<Cg  
static int KeyCount =0; hcd!A 5  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift IES41y<  
#pragma data_seg() Tavtr9L0XY  
HINSTANCE hins; PG\\V$}A(  
void VerifyWindow(); r(PJ~8)(=  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 2;dM:FHLhO  
//{{AFX_MSG_MAP(CHookApp) 9)ACgz&(  
// NOTE - the ClassWizard will add and remove mapping macros here. FP.(E9  
// DO NOT EDIT what you see in these blocks of generated code! k,a,h^{}j  
//}}AFX_MSG_MAP JqL<$mSep  
END_MESSAGE_MAP() yW%&_s0  
:yd=No@  
CHookApp::CHookApp() }*xC:A%aS  
{ b$;HI7)/K  
 // TODO: add construction code here, bMSD/L  
 // Place all significant initialization in InitInstance kqjxJ5  
} V;M3z9xd  
e_YW~z=6t  
CHookApp theApp; ['/;'NhdlY  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %{N>c:2I$  
{ }".\ 4B$n  
 BOOL bProcessed=FALSE; xmCm3ekmpC  
 if(HC_ACTION==nCode) nwZ[Ygl|  
 { #N<s^KYG-  
  if((lParam&0xc0000000)==0xc0000000){// Key up _bN))9 3  
   switch(wParam) e-nWD  
   { \DG( 8l  
    case VK_MENU: 4U}.Skzq  
     MaskBits&=~ALTBIT; .d<~a1k  
     break; ]hCWe0F  
    case VK_CONTROL: FCsyKdM  
     MaskBits&=~CTRLBIT; U)&H.^@r$  
     break; q$e T!'x  
    case VK_SHIFT: &. |;yt%v  
     MaskBits&=~SHIFTBIT; BZ]&uD|f  
     break; T=hm#]   
    default: //judge the key and send message ?7rmwy\  
     break; Y!K^-Y}  
   } <) >gg!   
   for(int index=0;index<MAX_KEY;index++){ Bbn832iMUY  
    if(hCallWnd[index]==NULL) r< d?  
     continue; h$#4ebp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eZa3K3^  
    { z|t.y.JX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); }w|=c >'_}  
     bProcessed=TRUE; ,*9#c*'S  
    } DzX6U[=  
   } *~\;&G29Y  
  } 0lvb{Zd  
  else if((lParam&0xc000ffff)==1){ //Key down `Gy>tD.#V-  
   switch(wParam) mvW^P`nB  
   { ^*$WZMMJ1  
    case VK_MENU: :O>Nd\UtO  
     MaskBits|=ALTBIT; BP7<^`i&  
     break; &;uGIk>s  
    case VK_CONTROL: q\{;_?a  
     MaskBits|=CTRLBIT; VfJX<e=k  
     break; )[^:]}%r  
    case VK_SHIFT: XY$cx~  
     MaskBits|=SHIFTBIT; jS5t?0  
     break; il`C,CD  
    default: //judge the key and send message a8lo!e9q  
     break; Px^<2Q%Fs  
   } |zr)hC  
   for(int index=0;index<MAX_KEY;index++) *`\4j*$^  
   { {<Xo,U7 y  
    if(hCallWnd[index]==NULL) n]6w)wE (  
     continue; l1`c?Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) j3V"d3)  
    { 6w .iEb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); do :RPZ!  
     bProcessed=TRUE; |eVTxeq  
    } /M{)k_V  
   } +@<^i?ale  
  } U 8 .0L  
  if(!bProcessed){ 4^jZv$l5  
   for(int index=0;index<MAX_KEY;index++){ r(/P||`l  
    if(hCallWnd[index]==NULL) :jN;l  
     continue; Di5Op(S((  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .,iw2:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 16d{IGMz  
   } 'E4(!H,k  
  } Hf E;$  
 } X~/ 9Vd g  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 0^-b}  
} rnt$BB[g  
 :L+zUlsf  
BOOL InitHotkey() Xb07 l3UG  
{ cR@}   
 if(hHook!=NULL){ >=RHE@  
  nHookCount++; ~A{[=v  
  return TRUE; K`AW?p^$Y  
 } ^,\se9=(  
 else H"Em|LX^  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); :fMM-?s]  
  if(hHook!=NULL) W0C$*oe!_i  
   nHookCount++; tI(t%~>^  
  return (hHook!=NULL); r%?}5"*  
} jl ?y}  
BOOL UnInit() =K&q;;h  
{ &b#NF1Q.  
 if(nHookCount>1){ i~M.F=I5  
  nHookCount--; {UjIxV(J  
  return TRUE; jind!@}!  
 } ,hcBiL/  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ?)ZLxLV::  
 if(unhooked==TRUE){ ,\">ovV33  
  nHookCount=0; k? _$h<Y  
  hHook=NULL; ;:K?7wfXn  
 } MJk:s[o  
 return unhooked; ^<H#dkECG  
} <MDFf nj  
c9TkIe  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >5YYij5Aj  
{ s!zr>N"  
 BOOL bAdded=FALSE; 1,sO =p)Yg  
 for(int index=0;index<MAX_KEY;index++){ _KlPbyLU  
  if(hCallWnd[index]==0){ ~o\]K  
   hCallWnd[index]=hWnd; WW Kr & )  
   HotKey[index]=cKey; "Mu $3 w  
   HotKeyMask[index]=cMask; Wug?CFX+T  
   bAdded=TRUE; EC&19  
   KeyCount++; 8CHf.SXh  
   break; 'J<zVD}0  
  } "\P~Re"EH  
 } Ffqn|} gb  
 return bAdded; vskM;  
} {Eb2<;1o{  
So0,)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) W!Os ci  
{ !EC\1rmdlN  
 BOOL bRemoved=FALSE; '[M2Q"X  
 for(int index=0;index<MAX_KEY;index++){ gbi~!S-  
  if(hCallWnd[index]==hWnd){ w[7HY@[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ S+=@d\S}"  
    hCallWnd[index]=NULL; D"><S<C\C  
    HotKey[index]=0; &rE l  
    HotKeyMask[index]=0; X\:(8C;+  
    bRemoved=TRUE; Bk(XJAjY  
    KeyCount--; dXy"yQ>{  
    break; &ppZRdq]  
   } Pn){xfqDl  
  } t7& GCZ  
 } _ -FQ78C  
 return bRemoved; CMB$RLf  
} hQrsZv:Q  
]0nC;|]@Lx  
void VerifyWindow() H5rNLfw '  
{ +R jD\6bJb  
 for(int i=0;i<MAX_KEY;i++){ &S`'o%B  
  if(hCallWnd!=NULL){ :1Yd;%>92  
   if(!IsWindow(hCallWnd)){ jfhDi6N  
    hCallWnd=NULL; jF2GHyB  
    HotKey=0; #pxet  
    HotKeyMask=0; #hiDZ>nr  
    KeyCount--; %y~]3XWik  
   } h.0&)t\q"  
  } 0hr)tYW,G  
 } LGue=Hkp  
} gG|1$  
D+nj[8y  
BOOL CHookApp::InitInstance() @G&xq "Fg7  
{ 04LVa|Y@U  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); :'Kx?Es   
 hins=AfxGetInstanceHandle(); mr\L q~*c  
 InitHotkey(); m,"tdVo.  
 return CWinApp::InitInstance(); G@6,O-Sj  
} Wam?(!{mOf  
Tp.iRFFkP  
int CHookApp::ExitInstance() :re(khZq#  
{ (B4 A$t  
 VerifyWindow(); /-9+(  
 UnInit(); "PP0PL^5F  
 return CWinApp::ExitInstance(); hndRg Co  
} bGLp0\0[  
gG?*Fi  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Or~6t}f  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) : l[Q  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ U-N/Z\QD  
#if _MSC_VER > 1000 b-gVRf#F  
#pragma once Ol^EQLO  
#endif // _MSC_VER > 1000 fu;B?mIn  
-s84/E4Y*  
class CCaptureDlg : public CDialog / 1@m#ZxA:  
{ mh SsOmJ5  
 // Construction Rs`Y'_B  
 public: [~0q )  
  BOOL bTray; uw&,pq  
  BOOL bRegistered; #GJh:#tt^  
  BOOL RegisterHotkey(); QiL  
  UCHAR cKey; tXuxTVhoT  
  UCHAR cMask; _\6(4a`,  
  void DeleteIcon(); M?CMN.Dw  
  void AddIcon(); ph+tk5k  
  UINT nCount; tOVm~C,R  
  void SaveBmp(); ZX}"  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor )4C6+63OD&  
  // Dialog Data - C]a2  
  //{{AFX_DATA(CCaptureDlg) ~#Mx&mZ  
  enum { IDD = IDD_CAPTURE_DIALOG }; b,sc  
  CComboBox m_Key; )xs,  
  BOOL m_bControl; j ZafwBi  
  BOOL m_bAlt; 7l EwQ  
  BOOL m_bShift; (NlEb'~+  
  CString m_Path; [Y~s  
  CString m_Number; a-hGpYJJG  
  //}}AFX_DATA H(m+rk  
  // ClassWizard generated virtual function overrides Um|Tf]q  
  //{{AFX_VIRTUAL(CCaptureDlg) |a\TUzq  
 public: )SLs  [  
  virtual BOOL PreTranslateMessage(MSG* pMsg); a VMFjkW  
 protected: \5_^P{p7<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (LPc\\Vv  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 4(gf!U  
  //}}AFX_VIRTUAL (ytkq(  
  // Implementation I(S6DkU  
 protected: N#ObxOE6T"  
  HICON m_hIcon; \mG M#E  
  // Generated message map functions Ji=iq=S7  
  //{{AFX_MSG(CCaptureDlg) q,Q|Uvpk  
  virtual BOOL OnInitDialog(); h}_q  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); {<n)zLy  
  afx_msg void OnPaint(); N/=3Bs0y-  
  afx_msg HCURSOR OnQueryDragIcon(); 1r4/McB  
  virtual void OnCancel(); =hlu, By  
  afx_msg void OnAbout(); bS6Yi)p  
  afx_msg void OnBrowse(); s]>%_(5  
  afx_msg void OnChange(); TD9`S SpP  
 //}}AFX_MSG xUoY|$fI  
 DECLARE_MESSAGE_MAP() GC3L2C0)k  
}; 8B9zo&  
#endif 4Fq}*QJ-  
3I(M<sB}  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file n-Y'LK40Os  
#include "stdafx.h" *5)!y d  
#include "Capture.h" >$F]Ss)$  
#include "CaptureDlg.h" ]vErF=[U,  
#include <windowsx.h> ';F][x5j  
#pragma comment(lib,"hook.lib") 1>{(dd?L  
#ifdef _DEBUG }5U f`pM8  
#define new DEBUG_NEW 6Fb~`J~s  
#undef THIS_FILE dG+xr!  
static char THIS_FILE[] = __FILE__; *@^0xz{\z  
#endif z`SkKn0f Y  
#define IDM_SHELL WM_USER+1 j&5Xjl>4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); S\(_"xJPp  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); N|}`p"  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; aoS1Yt'@  
class CAboutDlg : public CDialog r0>T7yPAK  
{ 1L7,x @w  
 public: 5K<C  
  CAboutDlg(); z(qz(`eGC&  
  // Dialog Data ?CDq^)T[  
  //{{AFX_DATA(CAboutDlg) O/nS,Ux  
  enum { IDD = IDD_ABOUTBOX }; nt6"}vO  
  //}}AFX_DATA @d|9(,Q  
  // ClassWizard generated virtual function overrides \9^@,kfP  
  //{{AFX_VIRTUAL(CAboutDlg) k"$V O+}m  
 protected: 9~yuyv4$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r MlNp?{_  
  //}}AFX_VIRTUAL K%;yFEZ  
  // Implementation ~O6=dR  
 protected: Is[0ri   
  //{{AFX_MSG(CAboutDlg) ":ycyN@g  
  //}}AFX_MSG %b9M\  
  DECLARE_MESSAGE_MAP() f -5ZXpWs'  
}; 9m{rQ P/  
*Q?HaG|S  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) dGe  
{ CS49M  
 //{{AFX_DATA_INIT(CAboutDlg) yk/XfwQ5  
 //}}AFX_DATA_INIT rB]/N,R   
} u.6%n. g  
F ReK  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) T*m_rDDt  
{ 9`AQsZ2  
 CDialog::DoDataExchange(pDX); U^D7T|P$V  
 //{{AFX_DATA_MAP(CAboutDlg) Pl4d(2 7  
 //}}AFX_DATA_MAP ;nE}%lT  
} ; ]!  
_NFJm(X.  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Pif1sL6'  
 //{{AFX_MSG_MAP(CAboutDlg) +8M{y D9#  
 // No message handlers ~4 ab\hq  
 //}}AFX_MSG_MAP :|Cf$2k7  
END_MESSAGE_MAP() 9tO_hhEQ@  
Ai;Pht9qi  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) _1ins;c52  
: CDialog(CCaptureDlg::IDD, pParent) ^E^:=Q?'_  
{ $ }53f'QjW  
 //{{AFX_DATA_INIT(CCaptureDlg) al/~  
  m_bControl = FALSE; c@`P{ 6  
  m_bAlt = FALSE; Wj&s5;2a  
  m_bShift = FALSE; &n|gPp77$  
  m_Path = _T("c:\\"); (!s[~O6  
  m_Number = _T("0 picture captured."); jk@]d5  
  nCount=0; d<o  
  bRegistered=FALSE; ^_uzr}LE`  
  bTray=FALSE; =RA6p  
 //}}AFX_DATA_INIT aF:LL>H  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 XJ"9D#"a>  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); V]2Q92  
} -84Z8?_  
aO1cd_d6x_  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) gE1".qC  
{ y06 2/$*$  
 CDialog::DoDataExchange(pDX); !k:j+h/  
 //{{AFX_DATA_MAP(CCaptureDlg) sp%7iNs  
  DDX_Control(pDX, IDC_KEY, m_Key); JLhp25{x  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Z5Cv$bUc  
  DDX_Check(pDX, IDC_ALT, m_bAlt); W3b\LnUa  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ~X/T6(n$  
  DDX_Text(pDX, IDC_PATH, m_Path); [>E0(S]  
  DDX_Text(pDX, IDC_NUMBER, m_Number); `*]r.u0  
 //}}AFX_DATA_MAP _~!,x.Dbp  
} 7Do)++t  
 DWI!\lK  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) lk80)sTZ  
//{{AFX_MSG_MAP(CCaptureDlg) hY!G>d{J  
 ON_WM_SYSCOMMAND() MEu-lM7v  
 ON_WM_PAINT() KGIz)/eSg  
 ON_WM_QUERYDRAGICON() t%)L8%Jr  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) vzL>ZBe Z  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) kQ +   
 ON_BN_CLICKED(ID_CHANGE, OnChange) 1na[=Q2  
//}}AFX_MSG_MAP E] [DVY  
END_MESSAGE_MAP() bpkn[K"(  
99 [ "I:  
BOOL CCaptureDlg::OnInitDialog() ;$Y?j8g  
{ 04s N 4C  
 CDialog::OnInitDialog(); &("?6%GC  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); &7 ,wdG  
 ASSERT(IDM_ABOUTBOX < 0xF000); T*oH tpFj#  
 CMenu* pSysMenu = GetSystemMenu(FALSE); aD4ln]sFxG  
 if (pSysMenu != NULL) #r1x0s40D  
 { *jYwcW"R{z  
  CString strAboutMenu; -&c@c@dC  
  strAboutMenu.LoadString(IDS_ABOUTBOX); I ?1E}bv  
  if (!strAboutMenu.IsEmpty()) o}T]f(>}  
  { IAfYlS#<yD  
   pSysMenu->AppendMenu(MF_SEPARATOR); 1g;3MSn~  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 7cC$)  
  } L@/+u+j0  
 } KksbhN{AB  
 SetIcon(m_hIcon, TRUE); // Set big icon ! `SR$dnE  
 SetIcon(m_hIcon, FALSE); // Set small icon 1xw},y6T2  
 m_Key.SetCurSel(0); 8)i\d`  
 RegisterHotkey(); ,"D1!0  
 CMenu* pMenu=GetSystemMenu(FALSE); $z<CkMP!U7  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); og>f1NwS[  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); _7Z$"  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); t[<=QK  
 return TRUE; // return TRUE unless you set the focus to a control oR+Fn}mG  
} ;,viE~n  
:A[ Gtc(_  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ( nBsf1l  
{ dWI\VS9  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) w(vf>L6(  
 { 9`xq3EL2T  
  CAboutDlg dlgAbout; Qwb@3{  
  dlgAbout.DoModal(); IcA]<}0!"v  
 } r@_;L>  
 else 8'zwy d3  
 { k2xjcrg  
  CDialog::OnSysCommand(nID, lParam); 69_c,(M0  
 } (vQShe\  
} C. Sb4i*  
]|-y[iu  
void CCaptureDlg::OnPaint() @gZ%>qe  
{ Y$(G)Fs  
 if (IsIconic()) =/zQJzN  
 { R)#"Ab Z'  
  CPaintDC dc(this); // device context for painting _8bqk\m+  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); U8moVj8w1  
  // Center icon in client rectangle `aCcTs7~]p  
  int cxIcon = GetSystemMetrics(SM_CXICON); &B))3WFy  
  int cyIcon = GetSystemMetrics(SM_CYICON); UPbG_ #"wZ  
  CRect rect; KVK@Snn   
  GetClientRect(&rect); ~WVrtYJu  
  int x = (rect.Width() - cxIcon + 1) / 2; m^TkFt<BM  
  int y = (rect.Height() - cyIcon + 1) / 2; [\I\).  
  // Draw the icon P| G:h&  
  dc.DrawIcon(x, y, m_hIcon); n |(Y?`(  
 } 7Q^t(  
 else vZ*5 93C8  
 { d@C93VYp  
  CDialog::OnPaint(); L:~ "Vw6]_  
 } M,l Ib9  
} NWTsL OIm  
5Eq_L  
HCURSOR CCaptureDlg::OnQueryDragIcon() \wTW hr0  
{  HSTtDTo  
 return (HCURSOR) m_hIcon; hGPjH=^EM  
} `LNRl'Z m  
~x824xW  
void CCaptureDlg::OnCancel() ll6~8PN  
{ : G<1   
 if(bTray) OYe @P  
  DeleteIcon(); +|^rz#X  
  CDialog::OnCancel(); P}cGWfj  
} d~qDQ6!  
m,-:(82  
void CCaptureDlg::OnAbout() La9dFe-uu{  
{ H=B8'N  
 CAboutDlg dlg; Cfa?LgSz  
 dlg.DoModal(); <x,$ODso  
} {"O'kx  
si)920?E&  
void CCaptureDlg::OnBrowse() \vKMNk;kz  
{ d6wsT\S  
 CString str; [0  3Aej  
 BROWSEINFO bi; 1XwbsKQ}  
 char name[MAX_PATH]; ,b2Cl[  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); FLi)EgZXt  
 bi.hwndOwner=GetSafeHwnd(); =EFF2M`F  
 bi.pszDisplayName=name; ao Y "uT+  
 bi.lpszTitle="Select folder"; SeKU ?\  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; !5pnl0DK*  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); !MoGdI-<r[  
 if(idl==NULL) CmM K\R.  
  return; _8kZ>w(L  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); u PjJ>v  
 str.ReleaseBuffer(); l,L#y 4#  
 m_Path=str; *V5R[   
 if(str.GetAt(str.GetLength()-1)!='\\') gaVWfG  
  m_Path+="\\"; W,}C*8{+  
 UpdateData(FALSE); wQDKv'zU1  
} 1)H+iN|im/  
{i3]3V"Xp  
void CCaptureDlg::SaveBmp() |R DPx6!V  
{ W$  M4#  
 CDC dc;  #\Lt0  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 2B5Z0<  
 CBitmap bm; =fEn h'KE  
 int Width=GetSystemMetrics(SM_CXSCREEN); RY/9Ku `  
 int Height=GetSystemMetrics(SM_CYSCREEN); zaa>]~g.  
 bm.CreateCompatibleBitmap(&dc,Width,Height); B xq(+^T  
 CDC tdc; ^lf{IM-Y  
 tdc.CreateCompatibleDC(&dc); o|$l+TC  
 CBitmap*pOld=tdc.SelectObject(&bm); )y_MI r  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); zJOL\J'  
 tdc.SelectObject(pOld); f8!*4Bw  
 BITMAP btm; b<NI6z8\  
 bm.GetBitmap(&btm); b v~"_)C  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; P;{f+I|`  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); wm !Y5  
 BITMAPINFOHEADER bih; BH0].-)[y!  
 bih.biBitCount=btm.bmBitsPixel; hr(E, TAe  
 bih.biClrImportant=0; {|bf`  
 bih.biClrUsed=0; i_Ab0vye  
 bih.biCompression=0; w>J|416  
 bih.biHeight=btm.bmHeight; GeD^-.^  
 bih.biPlanes=1; b+9M? k"  
 bih.biSize=sizeof(BITMAPINFOHEADER); I 4 ,C-D  
 bih.biSizeImage=size; L slI!.(  
 bih.biWidth=btm.bmWidth; EE=!Y NP]  
 bih.biXPelsPerMeter=0; JT#jJ/^  
 bih.biYPelsPerMeter=0; {rBS52,Z#  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); p~6/  
 static int filecount=0; { owK~  
 CString name; fKb8)PDP  
 name.Format("pict%04d.bmp",filecount++); Z`Rrv$M!  
 name=m_Path+name; Nyip]VwMJ  
 BITMAPFILEHEADER bfh; \x5b=~/   
 bfh.bfReserved1=bfh.bfReserved2=0; B ;@7  
 bfh.bfType=((WORD)('M'<< 8)|'B'); fczId"   
 bfh.bfSize=54+size; |gg 6|,Bt4  
 bfh.bfOffBits=54; tI~.3+F  
 CFile bf; 3o5aB1   
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){  v=R=K  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); V)mitRaV  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Vf:/Kokq  
  bf.WriteHuge(lpData,size); 1Ue )&RW  
  bf.Close(); Ko|nF-r_  
  nCount++; 8GgZAu'X  
 } EIPNR:6t  
 GlobalFreePtr(lpData); j}ywdP`a  
 if(nCount==1) Q$^oIFb  
  m_Number.Format("%d picture captured.",nCount); Ru9QQaHE  
 else FCgr  
  m_Number.Format("%d pictures captured.",nCount); 7j| ^ZuI+  
  UpdateData(FALSE); * G!C 'w\$  
} %F_)!M;x  
F<39eDNpz  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -|YG**i/  
{ )!z<q}i5  
 if(pMsg -> message == WM_KEYDOWN) n** W  
 { [T<nTB# w  
  if(pMsg -> wParam == VK_ESCAPE) f~ kz=R=  
   return TRUE; 38#BINhBt  
  if(pMsg -> wParam == VK_RETURN) MH7 n@.t  
   return TRUE; )7jjfD\  
 } #q#C_"  
 return CDialog::PreTranslateMessage(pMsg); Au~l O  
} &c>%E%!"  
p8,Rr{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) w+($= n~  
{ 0N>NX?r  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 0h=NbLr|S-  
  SaveBmp(); $P rji  
  return FALSE; j1D 1tn  
} @K .{o'  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ /enlkZx=8  
 CMenu pop; !Lkk1z o  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); m[n=t5~  
 CMenu*pMenu=pop.GetSubMenu(0); g9C/Oj`I  
 pMenu->SetDefaultItem(ID_EXITICON); AtU%S9  
 CPoint pt; :+#$=4  
 GetCursorPos(&pt); q(xr5iuP_  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); AUjZYp  
 if(id==ID_EXITICON) a4aM.o  
  DeleteIcon(); Z$jqB~=^e  
 else if(id==ID_EXIT) In13crr4!  
  OnCancel(); x# MMrV&M  
 return FALSE; m'HAt~  
} |z1er"zR)  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 89n\$7Ff9  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) t@r>GHO  
 AddIcon(); ~(aMKB  
 return res; ~i_YrTp  
} @%iZT4`Ejf  
69< <pm,m  
void CCaptureDlg::AddIcon() hvW FzT5  
{ lEAf\T7  
 NOTIFYICONDATA data; 8_$[SV$q  
 data.cbSize=sizeof(NOTIFYICONDATA); 7]sRHX0o%  
 CString tip; JX!z,X?r4  
 tip.LoadString(IDS_ICONTIP); &FrUj>i  
 data.hIcon=GetIcon(0); 1?I_fA}  
 data.hWnd=GetSafeHwnd(); YF8;s4  
 strcpy(data.szTip,tip); A; _Zw[  
 data.uCallbackMessage=IDM_SHELL; -So$ f-y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; R` g'WaDk  
 data.uID=98; (E(J}r~E  
 Shell_NotifyIcon(NIM_ADD,&data); , L_u X  
 ShowWindow(SW_HIDE); !%X~`&9  
 bTray=TRUE; nIZ;N!r=i  
} -A]-o  
'`+8'3K~E  
void CCaptureDlg::DeleteIcon() ~dXiyU,y2  
{ ;*(i}'  
 NOTIFYICONDATA data; 6&* z  
 data.cbSize=sizeof(NOTIFYICONDATA); ]?S@g'Jd0Q  
 data.hWnd=GetSafeHwnd(); A_8Xhem${  
 data.uID=98; Q l#y7HW  
 Shell_NotifyIcon(NIM_DELETE,&data); /aV;EkyO,  
 ShowWindow(SW_SHOW); ,F%2'W  
 SetForegroundWindow(); S$N!Dj@e;  
 ShowWindow(SW_SHOWNORMAL); Fv_B(a  
 bTray=FALSE; !}lCwV  
} )B*D\9\Z  
k%D|17I  
void CCaptureDlg::OnChange() gUr #3#  
{ h;[<4zw  
 RegisterHotkey(); ,tTq25~H\  
} Efp[K}Z^$  
q!;u4J  
BOOL CCaptureDlg::RegisterHotkey() )&6ZgRq  
{ 0ZM#..3sI  
 UpdateData(); !P8Y(i  
 UCHAR mask=0; "%I<yUP]U  
 UCHAR key=0; {k}$L|w  
 if(m_bControl) *3iEO>  
  mask|=4; +-r ~-bs  
 if(m_bAlt) ctOBV  
  mask|=2; N?EeT}m_  
 if(m_bShift) utu V'5GD  
  mask|=1; gWD46+A){  
  key=Key_Table[m_Key.GetCurSel()]; A Xpg_JC  
 if(bRegistered){ .QU]  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); b9;w3Ba  
  bRegistered=FALSE; ni$;"R GC  
 } "|Gr3sD  
 cMask=mask; Np"~1z.(b  
 cKey=key; A('o &H  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 3*zywcTH  
 return bRegistered; Lm8uN?  
} BaVooN~C  
=28ZSo^  
  四、小结 9^+E$V1@  
!tzk7D  
  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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