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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: qiEw[3Za]'  
  W:5uoO]=<  
  一、实现方法 yW3!V-iA  
ca )n*SD  
  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: gY!+x=cx0  
jQ>~  
#pragma data_seg("shareddata") >3aB{[[N  
HHOOK hHook =NULL; //钩子句柄 *CtWDUxSdW  
UINT nHookCount =0; //挂接的程序数目 {`RCh]W  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 `Hlv*" w$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 >|j8j:S[  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Fsdp"X.  
static int KeyCount =0; B\WIoz;'  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 eKpWFP 0  
#pragma data_seg() hA"N&v~  
N\vc<Zpn  
  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。 |e9}G,1  
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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: +Q'/c0o  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR kL&^/([9  
cKey,UCHAR cMask) 0zEn`rq&  
{ "ex? #qD&  
 BOOL bAdded=FALSE; }&!rIU  
 for(int index=0;index<MAX_KEY;index++){ 9]S}m[8k  
  if(hCallWnd[index]==0){ :n>h[{ o%  
   hCallWnd[index]=hWnd; yx-{}Yj^  
   HotKey[index]=cKey; H,uOshR  
   HotKeyMask[index]=cMask; O" z=+79q  
   bAdded=TRUE; Ohjqdv@  
   KeyCount++; MVTU$ 65  
   break; #ucOjdquq  
  } `*~:n vU  
 } v& ? Bqj  
 return bAdded; & XrV[d[>  
} !|`YNsR  
//删除热键 un\"1RdO  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9(H8MUF0{  
{ LN7;Yr  
 BOOL bRemoved=FALSE; Gd'^vqo<  
 for(int index=0;index<MAX_KEY;index++){ )`U T#5  
  if(hCallWnd[index]==hWnd){ ."h;H^5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ A5nu`e9&  
    hCallWnd[index]=NULL; ?$o8=h  
    HotKey[index]=0; i=SX_#b^  
    HotKeyMask[index]=0; *M8 4Dry`y  
    bRemoved=TRUE; jm*v0kNy  
    KeyCount--;  D}_\oE/n  
    break; PPmZ[N9(;  
   } $y`|zK|G-  
  } {UwJg  
 } Xe*  L^8+  
 return bRemoved; aUJ&  
} uT=sDWD :  
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dLo%+V#/A  
  DLL中的钩子函数如下: w%L0mH2]ng  
; xs?^N|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {E@@14]g  
{ $<T)_g  
 BOOL bProcessed=FALSE; [.0R"|$sy+  
 if(HC_ACTION==nCode) 4}l,|7_&I  
 { 3J@# V '  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 zf^!Zqn[8z  
   switch(wParam) Gd"lB*^Ht  
   {  E|ZY2&J`4  
    case VK_MENU: }G-qOt  
     MaskBits&=~ALTBIT; %Uuhi&PA-l  
     break; mWO=(}Fb\  
    case VK_CONTROL: \24neD4cM@  
     MaskBits&=~CTRLBIT; {U&Mo97rzX  
     break; N=|w]t0*yc  
    case VK_SHIFT: %1e`R*I  
     MaskBits&=~SHIFTBIT; koaH31Q  
     break; `<[Zs]Fe4  
    default: //judge the key and send message P 0,]Ud  
     break; jp2l}C  
   } >j\zj] -"  
   for(int index=0;index<MAX_KEY;index++){ X8Gw8^t  
    if(hCallWnd[index]==NULL) Tqm9><!r  
     continue; Kf(% aDYq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1{"e'[ L  
    { CK.Z-_M  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *}yW8i}36  
     bProcessed=TRUE; e}aD <E G  
    } dpTap<Noby  
   } :#b[gWl0Ru  
  } +dR$;!WB3  
  else if((lParam&0xc000ffff)==1){ //有键按下 011 _(v  
   switch(wParam) .lRO; D  
   { T w/CJg  
    case VK_MENU: u},<On  
     MaskBits|=ALTBIT; t?{E_70W  
     break; AnIENJ  
    case VK_CONTROL: TB1 1crE  
     MaskBits|=CTRLBIT; 3+Xz5>"a  
     break; 8`'_ckIgr  
    case VK_SHIFT: {8b6A~/  
     MaskBits|=SHIFTBIT; 1\_4# @')  
     break; 'ApWYt  
    default: //judge the key and send message 5AQ $xm4  
     break; t5[{ihv~:  
   } HOXqIZN85  
   for(int index=0;index<MAX_KEY;index++){ c_&iGQ  
    if(hCallWnd[index]==NULL) k1B7uA'h"G  
     continue; 2I6c7H s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) KJJ8P`Kx  
    { 8h-6;x^^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); F|Jo|02  
     bProcessed=TRUE; /.Gx n0  
    } aRg- rz  
   } 0=7C-A1(D  
  } wGAN"K:e  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 'szkn0  
   for(int index=0;index<MAX_KEY;index++){ Uu8Z2M  
    if(hCallWnd[index]==NULL) a&4>xZU #  
     continue; aCy2 .Qn  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) rVFAwbR  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); L 'H1\' o  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 T3+hxS  
   } I6h{S}2  
  } M HlP)'  
 } c :hOQZ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "k5 C?~  
} d;H1B/  
Y KeOH  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ]%F3 xzOk  
O. @_2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ub./U@ 1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4s.wQ2m  
x w]Zo<F  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: n"d~UV^Uw  
V'\4sPt  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2u/(Q>#  
{ 1,9RfYV  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) J1P82=$,  
 { C`7HC2Is  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 FHqa|4Ie  
  SaveBmp(); "kVN|Do  
  return FALSE; B5P++aQ  
 } ayHI(4!$j  
 …… //其它处理及默认处理 Ui'~d(F  
} $A8eMJEpL  
h$4V5V  
|4x&f!%m  
  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。 boJQ3Xc  
<o^mQq&  
  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。 uWvl<{2  
Y -7x**I  
  二、编程步骤 5/>G)&  
a(BWV?A  
  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"; BDD^*Y  
>LwAG:Ud  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; =KMd! $J\  
Vy&F{T;$  
  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; %t:1)]2  
VOp8 ,!  
  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; 7Ja^d-F7  
hRtnO|Z6  
  5、 添加代码,编译运行程序。 %pe7[/  
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三、程序代码 f.Q?-M  
=+A8s$Pb  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ?gH[tN:=  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) b> &kL  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ U_Emp[  
#if _MSC_VER > 1000 :q0C$xF  
#pragma once Hg*6I%D[So  
#endif // _MSC_VER > 1000 sW@4r/F>:D  
#ifndef __AFXWIN_H__ i!ejK6Q  
#error include 'stdafx.h' before including this file for PCH 3[-L'!pOX3  
#endif -QI1>7sl  
#include "resource.h" // main symbols J[RQF54qA{  
class CHookApp : public CWinApp FwmE1,  
{ )TVyRYZ1  
 public: Bn-%).-ED  
  CHookApp(); a~:'OW:Q  
  // Overrides X;6&:%ZL@^  
  // ClassWizard generated virtual function overrides )I$_wB!UV  
  //{{AFX_VIRTUAL(CHookApp) u`R  
 public: c R[DT04  
  virtual BOOL InitInstance(); V~NS<!+q  
  virtual int ExitInstance(); y =G  
  //}}AFX_VIRTUAL &HT P eB  
  //{{AFX_MSG(CHookApp) |A[Le ;,  
  // NOTE - the ClassWizard will add and remove member functions here. rnEWTk7&  
  // DO NOT EDIT what you see in these blocks of generated code ! \6 2|w HX  
  //}}AFX_MSG pc:~_6S  
  DECLARE_MESSAGE_MAP() H [R|U   
}; ERCW5b[RT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); `?2S4lN/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); CP["N(fF  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,^`+mP  
BOOL InitHotkey(); y*2:(nI  
BOOL UnInit(); 2{| U  
#endif ZMy,<wk  
SI4M<'fK  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. xBl}=M?Qu  
#include "stdafx.h" s-3vp   
#include "hook.h" s@K|zOx  
#include <windowsx.h> J XbG|L  
#ifdef _DEBUG x_s9DkX  
#define new DEBUG_NEW GbBcC#0  
#undef THIS_FILE P)7SK&]r;=  
static char THIS_FILE[] = __FILE__; G# .z((Rj  
#endif =Pd3SC})6V  
#define MAX_KEY 100 l" *zr ;#  
#define CTRLBIT 0x04 ikw_t?  
#define ALTBIT 0x02 #q6jE  
#define SHIFTBIT 0x01 G\=7d%T+  
#pragma data_seg("shareddata")  r@/+  
HHOOK hHook =NULL; Ip|~j} }  
UINT nHookCount =0; !QSL8v@c  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey PL%U  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 3.xsCcmP  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey F  MHp a  
static int KeyCount =0; N0vr>e`  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift L|u\3.:  
#pragma data_seg() q~ T*R<S  
HINSTANCE hins; BwEO2a{  
void VerifyWindow(); l _dWS9  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) =j#uH`jgW  
//{{AFX_MSG_MAP(CHookApp)  &)T5V  
// NOTE - the ClassWizard will add and remove mapping macros here. 'W@X139zq  
// DO NOT EDIT what you see in these blocks of generated code! e)zE*9  
//}}AFX_MSG_MAP L(fOe3 v  
END_MESSAGE_MAP() bd5\Rt  
hV)D,oN3  
CHookApp::CHookApp() pW2NrBq@w  
{ iT227v!s  
 // TODO: add construction code here, O@ F0UM`!  
 // Place all significant initialization in InitInstance RpOGY{[)[  
} y U =) g  
*GH` u*C_  
CHookApp theApp; iV58 m  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) SDwTGQ/0  
{ +vIpt{733  
 BOOL bProcessed=FALSE; .D!0$W mOZ  
 if(HC_ACTION==nCode) ZUVA EH%  
 { l_P-j 96WD  
  if((lParam&0xc0000000)==0xc0000000){// Key up {*0<T|<n  
   switch(wParam) w)kNkD  
   { dZ  rAn  
    case VK_MENU: aqRhh=iS  
     MaskBits&=~ALTBIT; ypKUkH/  
     break; hb zC#@ q  
    case VK_CONTROL: wKZ$iGMbz  
     MaskBits&=~CTRLBIT; `\T]ej}zvI  
     break; \>:CvTzF  
    case VK_SHIFT: x(etb<!jd  
     MaskBits&=~SHIFTBIT; #{?PbBE}  
     break; P9^-6;'Y  
    default: //judge the key and send message trPAYa}W  
     break; FbaEB RM  
   } }=gx#  
   for(int index=0;index<MAX_KEY;index++){ \O*-#}~\  
    if(hCallWnd[index]==NULL) TcjEcMw,  
     continue; Hfw q/Is  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .S(TxksCz  
    { cZB7fmq%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ne8Cgp  
     bProcessed=TRUE; M dZ&A}S  
    } 3D!5T8 @  
   } AsAT_yv#  
  } 4wa`<H&S5  
  else if((lParam&0xc000ffff)==1){ //Key down QDs^Ije  
   switch(wParam) Z:,U]Z(  
   { 5p<ItU$pnL  
    case VK_MENU: qq) rd  
     MaskBits|=ALTBIT; y#Fv+`YDl  
     break; Rn`x7(WA  
    case VK_CONTROL: b$ve sJ  
     MaskBits|=CTRLBIT; WG6FQAo^8  
     break; W-x?:X<}  
    case VK_SHIFT: \ e\?I9  
     MaskBits|=SHIFTBIT; {sihus#Q  
     break; WHsgjvh"  
    default: //judge the key and send message r=5{o 1"  
     break; ;> _$`  
   } 1rv)&tKs  
   for(int index=0;index<MAX_KEY;index++) _LMM,!f  
   { P<l&0dPO8  
    if(hCallWnd[index]==NULL) pP*zq"o  
     continue; ]ndvt[4L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) QrB@cK]  
    { < ,Ue 0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,TXTS*V?  
     bProcessed=TRUE; TD'L'm|2  
    } 0Sle  
   } &u /Nf&A  
  } u.mJQDTH  
  if(!bProcessed){ lsNrAA%m  
   for(int index=0;index<MAX_KEY;index++){ zm]aU`j  
    if(hCallWnd[index]==NULL) LQtj~c>X-|  
     continue; UUzYbuS>&l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) wF <n=  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9z}uc@#D=m  
   } 73V|6tmgY  
  } 2"Ecd  
 } \R|4( +]x  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); gZLP\_CL  
} .q `Hjmg<  
ZAv,*5&<  
BOOL InitHotkey() G?E oPh^m  
{ Gnfd;. (.  
 if(hHook!=NULL){ ^cczJOxB  
  nHookCount++; P%{^i]  
  return TRUE; bn^{c  
 } Pa{%\dsv  
 else uT}' Y)m  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ]z l [H7  
  if(hHook!=NULL) n` xR5!de  
   nHookCount++; Qa.<K{m#?  
  return (hHook!=NULL); 7w'wjX-  
} -i)ZQCE  
BOOL UnInit() ptDY3n~'  
{ RLb KD>  
 if(nHookCount>1){ X:6c}p%,!  
  nHookCount--; 2Ou[u#H  
  return TRUE; -7S g62THS  
 } a"FCZ.O1  
 BOOL unhooked = UnhookWindowsHookEx(hHook); UD8op]>L  
 if(unhooked==TRUE){ D@Vt^_  
  nHookCount=0; e6d<dXx  
  hHook=NULL; 5[A@ gw0u  
 } K{[%7AM  
 return unhooked; Zy o[(`y  
} :/ Q   
8ELCs<xI  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :a$\/E=  
{ +tVaBhd!  
 BOOL bAdded=FALSE; BaSZ71>9]r  
 for(int index=0;index<MAX_KEY;index++){ SzjkI+-$:  
  if(hCallWnd[index]==0){ DV _2P$tT|  
   hCallWnd[index]=hWnd; DpUbzr41+k  
   HotKey[index]=cKey; Fxm$9(Y  
   HotKeyMask[index]=cMask; w)Q0_2p.  
   bAdded=TRUE; (+B5|_xQu  
   KeyCount++; gLy&esJl1  
   break; qWODs  
  } CitDm1DXt/  
 } Kac' ;1  
 return bAdded; ^~3SSLS4"  
} W3 'q\+  
%`r?c<P}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) UPG9)aF  
{  \4v]7SV  
 BOOL bRemoved=FALSE; JwAYG5W  
 for(int index=0;index<MAX_KEY;index++){ Ib+Y~ XYR  
  if(hCallWnd[index]==hWnd){ qYlhlHD  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Kjs.L!W  
    hCallWnd[index]=NULL; jpO7'ivG  
    HotKey[index]=0; [uI|DUlI6o  
    HotKeyMask[index]=0; Y?(r3E^x  
    bRemoved=TRUE; aFS,GiB  
    KeyCount--; %k'!Iq+  
    break; YgUvOyaQXf  
   } YbTxn="_  
  } px}|Mu7z~  
 } WJ4li@T7V  
 return bRemoved; [%77bv85.G  
} cd$m25CxC  
"4uS3h2r  
void VerifyWindow() 0@H|n^Md#  
{ K95p>E`9e  
 for(int i=0;i<MAX_KEY;i++){ my4giC2a  
  if(hCallWnd!=NULL){ F W/W%^  
   if(!IsWindow(hCallWnd)){ o]; [R  
    hCallWnd=NULL; @I_8T$N=  
    HotKey=0; iZaI_\"__  
    HotKeyMask=0; 7z!tKs"TMT  
    KeyCount--; =jX8.K4]  
   } L1Iz<>  
  } S$Q8>u6Wk  
 } l zYnw)Pv  
} 1oN^HG6O  
+eFFSt  
BOOL CHookApp::InitInstance() FE2f'e  
{ Axe8n1*y  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); W!?7D0q  
 hins=AfxGetInstanceHandle(); ]y,==1To  
 InitHotkey(); UG'9*(*  
 return CWinApp::InitInstance(); +(C6#R<LI  
} uWM{JEOl  
kX>f^U{j  
int CHookApp::ExitInstance() pBETA'fY  
{ 20Z8HwQi  
 VerifyWindow(); ]K/DY Do-  
 UnInit(); oE(7v7iY  
 return CWinApp::ExitInstance(); $aN&nhoO<  
} " QWq_R  
.8y3O]  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?zQA  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) OU/MiyP2  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ _c, '>aH=  
#if _MSC_VER > 1000 ,ztI,1"k  
#pragma once s;64N'HH  
#endif // _MSC_VER > 1000 R +WP0&d'  
V( -mD  
class CCaptureDlg : public CDialog 'rr^2d]`ST  
{ D,g1<:<  
 // Construction C\di7z:  
 public: XwlbJ=mf  
  BOOL bTray; I+dbZBX  
  BOOL bRegistered; '*?WU_L(g  
  BOOL RegisterHotkey(); 9Iz%ht  
  UCHAR cKey; 3Ei5pX=g  
  UCHAR cMask; |jVM&R2s  
  void DeleteIcon(); T+<A`k: -  
  void AddIcon(); y^}6!>Ou:  
  UINT nCount; cdG |m[  
  void SaveBmp(); iTV) NsC}  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor d\ ~QBr?  
  // Dialog Data :P@rkT3Qt  
  //{{AFX_DATA(CCaptureDlg) NsJ(`zk:  
  enum { IDD = IDD_CAPTURE_DIALOG }; k:#P|z$UD  
  CComboBox m_Key; CJXg@\\/  
  BOOL m_bControl; !V,{_(LT  
  BOOL m_bAlt; 'I /aboDB  
  BOOL m_bShift; N1}={yF.fQ  
  CString m_Path; 9`w)  
  CString m_Number; [w&$|h:;  
  //}}AFX_DATA (>I`{9x>6  
  // ClassWizard generated virtual function overrides gW1b~( fD  
  //{{AFX_VIRTUAL(CCaptureDlg) w&B#goS  
 public: dGFGr}&s  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ^+m+zd_  
 protected: j~e;DO  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support rJ!{/3e  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); )h8\u_U  
  //}}AFX_VIRTUAL \0H's{uek  
  // Implementation 't9hXzAfW  
 protected: !DI{:I_h(  
  HICON m_hIcon; Z+StB15  
  // Generated message map functions NSFs\a@1  
  //{{AFX_MSG(CCaptureDlg) .LuB\o$  
  virtual BOOL OnInitDialog(); -p E(_  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Cc, `}SP  
  afx_msg void OnPaint(); =Odv8yhn  
  afx_msg HCURSOR OnQueryDragIcon(); j $TwL;  
  virtual void OnCancel(); A,) VM9M_l  
  afx_msg void OnAbout(); _C+b]r/E  
  afx_msg void OnBrowse(); bug Ot7  
  afx_msg void OnChange(); Izv+i*(dl  
 //}}AFX_MSG l?q%?v8  
 DECLARE_MESSAGE_MAP() }h}<! s  
}; W7\&~IWub  
#endif )#}mH@  
G5,~Z&}YS  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file wfP5@!I  
#include "stdafx.h" q;:6_Qr  
#include "Capture.h" /^ " 83?_  
#include "CaptureDlg.h" gn{=%`[  
#include <windowsx.h> "aFhkPdWn  
#pragma comment(lib,"hook.lib") F>X-w+b4r  
#ifdef _DEBUG P/ oXDI8  
#define new DEBUG_NEW `+/H^  
#undef THIS_FILE u?[ q=0.J7  
static char THIS_FILE[] = __FILE__; o1/lZm{\~n  
#endif Dr9 ?2  
#define IDM_SHELL WM_USER+1 olW|$?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x5Z-{"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $) 5Bf3P0  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; $j 5,%\4<  
class CAboutDlg : public CDialog j2P n<0U  
{ nCKbgM'"  
 public: >l+EJ3W  
  CAboutDlg(); =9LC<2  
  // Dialog Data PjIeZ&p  
  //{{AFX_DATA(CAboutDlg) <q,+ON\'  
  enum { IDD = IDD_ABOUTBOX }; 2Nj9U#A  
  //}}AFX_DATA K$ v"Uk  
  // ClassWizard generated virtual function overrides do-c1;M  
  //{{AFX_VIRTUAL(CAboutDlg) ZE `lr+_Y  
 protected: ?'r9"M>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support t+nRw?Z  
  //}}AFX_VIRTUAL 8)VgS &B~  
  // Implementation 3qQUpm+  
 protected: ba@=^Fa;  
  //{{AFX_MSG(CAboutDlg) C#w]4$/  
  //}}AFX_MSG LjdYsai-  
  DECLARE_MESSAGE_MAP() wG8Wez%  
}; YGsS4ia*4i  
`Vq`z]}  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) o/,NGU  
{ IB|]fzy  
 //{{AFX_DATA_INIT(CAboutDlg) uvA(Rn  
 //}}AFX_DATA_INIT 'xFYUU]#T^  
} &gc `<kLu  
RH~3M0'0  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) :o"8MZp  
{ cywg[  
 CDialog::DoDataExchange(pDX);  l>v{  
 //{{AFX_DATA_MAP(CAboutDlg) 50a\e  
 //}}AFX_DATA_MAP <E\V`g  
} dZ :r&Qa  
ODf4+& u  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) v.W{x?5  
 //{{AFX_MSG_MAP(CAboutDlg) :G)<}j"sM  
 // No message handlers ,M3z!=oIGn  
 //}}AFX_MSG_MAP H:a|x#"  
END_MESSAGE_MAP() ' eO/PnYW  
!k~z5z'=py  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 2r ];V'r  
: CDialog(CCaptureDlg::IDD, pParent) sXl ??UGe  
{ ,2WH/"  
 //{{AFX_DATA_INIT(CCaptureDlg) ^ua12f  
  m_bControl = FALSE; ykq'g|  
  m_bAlt = FALSE; ^Y^"'"  
  m_bShift = FALSE; OR+A_:c.D  
  m_Path = _T("c:\\"); 6T^lS^  
  m_Number = _T("0 picture captured."); J-J3=JG  
  nCount=0; LD+f'^>>Z  
  bRegistered=FALSE; Kla:e[{  
  bTray=FALSE; !Y;<:zx5  
 //}}AFX_DATA_INIT 8.I9}_  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 =sQ(iso%f  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~Sy-ga J  
} j$eCe< .3  
L2U x9_S  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) [Hcaw   
{ '7nJb6V,0l  
 CDialog::DoDataExchange(pDX); Sa] mm/ G  
 //{{AFX_DATA_MAP(CCaptureDlg) v`{:~ q*  
  DDX_Control(pDX, IDC_KEY, m_Key);  a@|.;#FF  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); o_ yRn16  
  DDX_Check(pDX, IDC_ALT, m_bAlt); R!{7OkC  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 0~xaUM`  
  DDX_Text(pDX, IDC_PATH, m_Path); |vy]8?Ak  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Js}tZ\+P75  
 //}}AFX_DATA_MAP ^`&HWp  
} ",Wf uz  
R^9"N?Q7;`  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) F7 uhuqA]N  
//{{AFX_MSG_MAP(CCaptureDlg) }%{=].)L  
 ON_WM_SYSCOMMAND() spiDm:Xe  
 ON_WM_PAINT() >5i?JUZ  
 ON_WM_QUERYDRAGICON() aBCOGtf  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) silp<13HN  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) #v qz{R~nM  
 ON_BN_CLICKED(ID_CHANGE, OnChange) -I vL+}K  
//}}AFX_MSG_MAP sM9- 0A  
END_MESSAGE_MAP() S 1ibw\'  
jI#z/a!j:  
BOOL CCaptureDlg::OnInitDialog() |B1Af  
{ h]C2 8=N  
 CDialog::OnInitDialog(); B_@7IbB  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); )b (X  
 ASSERT(IDM_ABOUTBOX < 0xF000); aa=b<Cd  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 8g5.7{ky  
 if (pSysMenu != NULL) 0(vdkC4\A  
 { )GCLK<,swu  
  CString strAboutMenu; iJ*%dio  
  strAboutMenu.LoadString(IDS_ABOUTBOX); akrCs&Kka5  
  if (!strAboutMenu.IsEmpty()) Rc%PZ}es  
  { 8a!2zwUBV  
   pSysMenu->AppendMenu(MF_SEPARATOR); O &\<FT5  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); n@o  
  } L3>4t: 8  
 } #?5VsD8  
 SetIcon(m_hIcon, TRUE); // Set big icon Pd& ,G$l  
 SetIcon(m_hIcon, FALSE); // Set small icon s|p(KWo2U  
 m_Key.SetCurSel(0); Q5T(nEA  
 RegisterHotkey(); M->Kz{h?j  
 CMenu* pMenu=GetSystemMenu(FALSE); _6 /Qp`s  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); R''Sfz>8  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ^1vq{/ X  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); *q[^Q'jnN  
 return TRUE; // return TRUE unless you set the focus to a control 'U*udkn 2]  
} #m_\1&g  
`;T? 9n  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) MSF Nw  
{ 2"_ 18l.  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) H;X~<WN&AW  
 { .>a$g7Rj  
  CAboutDlg dlgAbout; i|[S5QXCh  
  dlgAbout.DoModal(); hXBqz9  
 } }" g@E-]N  
 else M`q#,Y?3^I  
 { cRPr9LfD@  
  CDialog::OnSysCommand(nID, lParam); )8\Z=uC  
 } t>=GVu^  
} I  *1#  
Yr Preuh  
void CCaptureDlg::OnPaint() s')!<E+z\t  
{ ;9 R40qi  
 if (IsIconic()) w2s,  
 { &<m WA]cAL  
  CPaintDC dc(this); // device context for painting fdvi}SS8  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); QZ_nQ3K  
  // Center icon in client rectangle g(M(Hn7  
  int cxIcon = GetSystemMetrics(SM_CXICON); p3i qW,[@  
  int cyIcon = GetSystemMetrics(SM_CYICON); ]ZBgE\[  
  CRect rect; `7+tPbjs  
  GetClientRect(&rect); O7E;W| ]  
  int x = (rect.Width() - cxIcon + 1) / 2; h%4 ~0  
  int y = (rect.Height() - cyIcon + 1) / 2; ,|=iv  
  // Draw the icon >0[qi1  
  dc.DrawIcon(x, y, m_hIcon); _AA`R`p;  
 } u9 da]*\7y  
 else Y>c5:F;  
 { JB: mbH  
  CDialog::OnPaint(); j>0SE  
 } 5k_Mj* {6  
} GN8`xR{J*  
V~tu<"%  
HCURSOR CCaptureDlg::OnQueryDragIcon() aa'0EU:  
{ = D;UMSf  
 return (HCURSOR) m_hIcon; ZnxOa  
} _,Io(QS  
M]pel\{M  
void CCaptureDlg::OnCancel() k N uN4/  
{ +$Ddd`J'  
 if(bTray) Sv CK;$:  
  DeleteIcon(); =[O<.'aG-  
  CDialog::OnCancel(); >(YPkmH  
} < '+R%6  
bE%mgaOh  
void CCaptureDlg::OnAbout() ph5xW<VNP  
{ B_6v'=7]  
 CAboutDlg dlg; '44nk(hM69  
 dlg.DoModal(); b smoLT  
} B "s8i{Vm  
hBs>2u|z9  
void CCaptureDlg::OnBrowse() UO7a}Tz<  
{ ~,3v<A[5Vi  
 CString str; y("0Xve  
 BROWSEINFO bi; M<|~MR  
 char name[MAX_PATH]; jd*%.FDi{  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); |4 d{X@`&  
 bi.hwndOwner=GetSafeHwnd(); {/[?YTDU  
 bi.pszDisplayName=name; M cMK|_H  
 bi.lpszTitle="Select folder"; K:Xrfn{s  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 2+G:04eS,e  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); P*qNRP%  
 if(idl==NULL) 1x<rh\oo  
  return; ~QQ23k&  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "Jv,QTIcS  
 str.ReleaseBuffer(); 2w.9Q (Sn  
 m_Path=str; XC8z|A-@  
 if(str.GetAt(str.GetLength()-1)!='\\') }C2i#;b  
  m_Path+="\\"; e|+;j}^C  
 UpdateData(FALSE); j~0ZE -e  
} 3B_} :  
*fy`JC  
void CCaptureDlg::SaveBmp() x /Ky: Ky  
{ uB)6\fkTB  
 CDC dc; cB"F1~z  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 1V9X(uP  
 CBitmap bm; #5"<.z  
 int Width=GetSystemMetrics(SM_CXSCREEN); N55=&-p  
 int Height=GetSystemMetrics(SM_CYSCREEN); Pc-8L]2oaF  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 7!840 :a?+  
 CDC tdc; E*b[.vUp  
 tdc.CreateCompatibleDC(&dc); ;[\2/$-  
 CBitmap*pOld=tdc.SelectObject(&bm); TD=/C|  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); })u}PQ  
 tdc.SelectObject(pOld); m ?tnk?oX  
 BITMAP btm; KUqS(u  
 bm.GetBitmap(&btm); zinl.8Uk  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; l8d%hQVqT  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); u9^;~i,  
 BITMAPINFOHEADER bih; *B~:L"N  
 bih.biBitCount=btm.bmBitsPixel; |JQP7z6j]  
 bih.biClrImportant=0; TF3q?0  
 bih.biClrUsed=0; nR'EuI~(}  
 bih.biCompression=0; 7[<sl35  
 bih.biHeight=btm.bmHeight; 5dEO_1q %  
 bih.biPlanes=1; 3#ZKuGg=  
 bih.biSize=sizeof(BITMAPINFOHEADER); [(UqPd$  
 bih.biSizeImage=size; xR6IXF>*  
 bih.biWidth=btm.bmWidth; qJzK8eW  
 bih.biXPelsPerMeter=0; eii7pbc  
 bih.biYPelsPerMeter=0; K?m:.ZM  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); BRLU&@G`1  
 static int filecount=0; ]4~D;mv  
 CString name; %((3'le  
 name.Format("pict%04d.bmp",filecount++); zLK ~i>aW  
 name=m_Path+name; D>^ix[:J  
 BITMAPFILEHEADER bfh; 3E@&wpj  
 bfh.bfReserved1=bfh.bfReserved2=0; )Nd:PnA  
 bfh.bfType=((WORD)('M'<< 8)|'B'); nt`l6b  
 bfh.bfSize=54+size; SF=|++b1f  
 bfh.bfOffBits=54; X}FF4jE]D(  
 CFile bf; @Iatlz*W  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ hQx e0Pdt  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); bUB6B  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Us]=Y}(  
  bf.WriteHuge(lpData,size); 5X#E@3g5  
  bf.Close(); sef]>q  
  nCount++; Huc|6~X  
 } 49AW6H.JT  
 GlobalFreePtr(lpData); 8#w)X/  
 if(nCount==1) k[ %aCGo  
  m_Number.Format("%d picture captured.",nCount); 7VAJJv3  
 else {WQq}-(  
  m_Number.Format("%d pictures captured.",nCount); YHB9mZi  
  UpdateData(FALSE); 0OnV0SIL  
} :Wc_Utt  
`:p1&OS  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) MG{l~|\x)  
{ ,$N#Us(Wa  
 if(pMsg -> message == WM_KEYDOWN) x6W `hpL  
 { GSi>l,y'  
  if(pMsg -> wParam == VK_ESCAPE) vcv CD7MD  
   return TRUE; B $XwTJ>  
  if(pMsg -> wParam == VK_RETURN) ~e-z,:Af  
   return TRUE; Jxa4hM0  
 } hr/o<#OW  
 return CDialog::PreTranslateMessage(pMsg); /TV= $gB`  
} wNYg$d0M  
r@kP*  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Z6Fp\aI8@  
{ ]PR#W_&q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?6"{!s{v  
  SaveBmp(); 4<gb36)|4  
  return FALSE; ,R2U`EO;  
} y >+mc7n  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Pw[g  
 CMenu pop; 2oCkG~j  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); aG%, cQ1  
 CMenu*pMenu=pop.GetSubMenu(0); y7)(LQRE {  
 pMenu->SetDefaultItem(ID_EXITICON); ;j%BK(5  
 CPoint pt; >V$ Gx>I  
 GetCursorPos(&pt); ~}"]&%Q{J  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); gckI.[!b  
 if(id==ID_EXITICON) y[?-@7i  
  DeleteIcon(); {d<;BLA  
 else if(id==ID_EXIT) n, i'Dhzk  
  OnCancel(); 8|%^3O 0X  
 return FALSE; 2RM+W2!!  
} O"G >wv  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 04U")-\O  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) / JkC+7H4  
 AddIcon(); VQ#3#Hj  
 return res; 3?n>yS  
} Tr0B[QF  
Pr ]Ka  
void CCaptureDlg::AddIcon() \QE)m<GUe  
{ Q[F}r`  
 NOTIFYICONDATA data; re?s.djT  
 data.cbSize=sizeof(NOTIFYICONDATA); UMl#D >:C<  
 CString tip; kn"(mJe$  
 tip.LoadString(IDS_ICONTIP); 6 GP p>X  
 data.hIcon=GetIcon(0); $-}e; VZb  
 data.hWnd=GetSafeHwnd(); 4k-+?L!/G  
 strcpy(data.szTip,tip); mE%$HZ}  
 data.uCallbackMessage=IDM_SHELL; a2Pf/D]n  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; y\dEk:\)  
 data.uID=98; . \   
 Shell_NotifyIcon(NIM_ADD,&data); sm[94,26  
 ShowWindow(SW_HIDE); s, k  
 bTray=TRUE; h\v'9  
} W"^wnGa@a  
X3'H `/  
void CCaptureDlg::DeleteIcon() r}[7x]sP  
{ EI!6MC)  
 NOTIFYICONDATA data; PxH72hBS  
 data.cbSize=sizeof(NOTIFYICONDATA); J Ro?s~Ih  
 data.hWnd=GetSafeHwnd(); $/!{OU.t`  
 data.uID=98; w?kJ+lmOQy  
 Shell_NotifyIcon(NIM_DELETE,&data); #Zrlp.M4  
 ShowWindow(SW_SHOW); gUyR_5q)8l  
 SetForegroundWindow(); J{^RkGF  
 ShowWindow(SW_SHOWNORMAL); rV08ad  
 bTray=FALSE; ys 5&PZg*  
} ( Jz;W<E  
i[wb0yL  
void CCaptureDlg::OnChange() q.,JVGMS  
{ |2{wG 4  
 RegisterHotkey(); 8Q_SRwN  
} \=_{na_  
o=0]el^A  
BOOL CCaptureDlg::RegisterHotkey() /0Ax*919j  
{ S)D nPjN{  
 UpdateData(); \7CGUB>L  
 UCHAR mask=0; As>_J=8} 3  
 UCHAR key=0; OpHsob~  
 if(m_bControl) fW?o@vlO  
  mask|=4; y*X_T,K 8  
 if(m_bAlt) n=[/Z!  
  mask|=2; l+V>]?j  
 if(m_bShift) BCA&mi3q  
  mask|=1; hP15qKy  
  key=Key_Table[m_Key.GetCurSel()]; ynbuN x*  
 if(bRegistered){ wiiCd  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); R=jI?p  
  bRegistered=FALSE; jYKor7KTqT  
 } z*-2.}&U<  
 cMask=mask; <_7*67{  
 cKey=key; >3Eo@J,?d  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); kBffF@{  
 return bRegistered;  P Y  
} Y=Kc'x[,Zj  
jbAx;Xt'=M  
  四、小结 pej|!oX  
MjU6/pO}L  
  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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