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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: xOKJOl  
  dxAGO(  
  一、实现方法 ,$:u^;V(  
k- 9i  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: :XFQ}Cl  
Hq 5#.rZ#  
#pragma data_seg("shareddata") ejZ-A?f-K  
HHOOK hHook =NULL; //钩子句柄 y,`n9[$K\  
UINT nHookCount =0; //挂接的程序数目 >~Zj  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 X}(X\rp  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 5X)QW5A  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ~ Ze!F"  
static int KeyCount =0; z@3gNY&7.8  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -d'F KOD  
#pragma data_seg() /B?wn=][  
aC2Vz9e  
  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。 01-rBto$  
h<3b+*wYJC  
  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: Nm z5:Rq  
x}K|\KXy  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ,+`r2}N \/  
cKey,UCHAR cMask) #Mn?Nn  
{ gU+yqT7=  
 BOOL bAdded=FALSE; w/o^OjwQ  
 for(int index=0;index<MAX_KEY;index++){ |Jd8ul:&e  
  if(hCallWnd[index]==0){ Y+Z+Y)K  
   hCallWnd[index]=hWnd; aSIb0`(3  
   HotKey[index]=cKey; `oikSx$vB.  
   HotKeyMask[index]=cMask; }|| p#R@?  
   bAdded=TRUE; !9 kNL  
   KeyCount++; |OF3O,5z  
   break; vw!7f|Pg ~  
  } "KK}} $>  
 } *uRDB9#9,  
 return bAdded; GBb8 }lx  
} * cW%Q@lit  
//删除热键 2QbKh)   
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "r@#3T$  
{ 5}hQIO&^%  
 BOOL bRemoved=FALSE; z_xy*Iif  
 for(int index=0;index<MAX_KEY;index++){ 9_5>MmiB  
  if(hCallWnd[index]==hWnd){ 5A`>3w{3n  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0Sd>*nC  
    hCallWnd[index]=NULL; w}l^B>Zz  
    HotKey[index]=0; p1niS:}j  
    HotKeyMask[index]=0; e_epuki  
    bRemoved=TRUE; j:1N&7<FU  
    KeyCount--; 02;'"EmP$  
    break; YX,;z/Jw2  
   } >l)x~Bkf$j  
  } 33lh~+C  
 } ,^c-}`!K  
 return bRemoved; Uz_ob9l<#H  
} ,0h{RZKw  
qbq2Bi'a  
jW8ad{  
  DLL中的钩子函数如下: 8/R$}b><  
P{K\}+9F   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) B"> Ko3  
{ [rcM32  
 BOOL bProcessed=FALSE; <Nrtkf4-O  
 if(HC_ACTION==nCode) Pzzzv^+  
 { >Um(gbG  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 )fXw~  
   switch(wParam) E]~ #EFc  
   {  z.hq2v  
    case VK_MENU: t'$_3ml  
     MaskBits&=~ALTBIT; n-M6~   
     break; F-:AT$Ok  
    case VK_CONTROL: `$1A;wg<  
     MaskBits&=~CTRLBIT; 1N$OXLu  
     break; { /!ryOA65  
    case VK_SHIFT: d1g7:s9$0  
     MaskBits&=~SHIFTBIT; ^E \4`  
     break; a] c03$fK  
    default: //judge the key and send message :dbO|]Xf  
     break; Y54yojvV  
   } J)Yz@0#T(;  
   for(int index=0;index<MAX_KEY;index++){ Hfj.8$   
    if(hCallWnd[index]==NULL) nX7F<k4G2  
     continue; '>|K d{J0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ckFPx l.  
    { >?JUGXAi'{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); KS5a8'U  
     bProcessed=TRUE; zwQ#Yvd  
    } U+B{\38  
   } ] rqx><!  
  } ~P}ng{x4z  
  else if((lParam&0xc000ffff)==1){ //有键按下 6rE8P#  
   switch(wParam) TW 1`{SM  
   { s7}-j2riq  
    case VK_MENU: \anOOn@  
     MaskBits|=ALTBIT; 3%9XJ]Qao  
     break; M<l<n$rYS  
    case VK_CONTROL: eVMnI yr  
     MaskBits|=CTRLBIT; ]:F !h2  
     break; ZZkc) @  
    case VK_SHIFT: DS4y@,/)'  
     MaskBits|=SHIFTBIT; bydI+pVMo  
     break; Q1kM 4Up  
    default: //judge the key and send message e9'0CH<  
     break; DQu)?Rsk  
   } Zp{K_ec{  
   for(int index=0;index<MAX_KEY;index++){ x76;wQ  
    if(hCallWnd[index]==NULL) tIV9Y=ckr0  
     continue; R!"`Po  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I+Yq",{%  
    { N?rE:0SJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Y#9bM $x7  
     bProcessed=TRUE; 5>S1lyam  
    } ^ux'-/  
   } ?vWF[ DRd'  
  } _ j'm2BA O  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 1jzu-s ,F  
   for(int index=0;index<MAX_KEY;index++){ G 9 &,`  
    if(hCallWnd[index]==NULL) 7ieAd/:_  
     continue; M).CyY;bm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Zr6.Nw  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); g*_n|7pB  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 4!ZT_q  
   } >@G"*le*)  
  } "tJ[M  
 } t}}Ti$$>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); WyB^b-QmDh  
} 73u97oe>1  
3e-E/6zH6  
  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: }3WP:Et  
Ht}?=ZzW  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v`Y{.>[H[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Vy/G-IASb  
W4P\HM>2  
  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: dqB N_P%  
FD%OG6db];  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 'bH~KK5  
{ NyC&j`d  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) TntTR"6aD  
 { ZjY?T)WE9  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 z&#^9rM"  
  SaveBmp(); XLYGhM  
  return FALSE; >Z gV8X:  
 } X<W${L$G  
 …… //其它处理及默认处理 b ~]v'|5[  
} G[`2Nd<  
PD^ 6Ywn>s  
eq"Xwq*  
  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。 vqoK9  
Ur1kb{i  
  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。 }{PG^Fc<P  
icVB?M,m  
  二、编程步骤 G"L`9E<0V  
3,hu3"@k  
  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"; |eye) E:  
f*xv#G  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; :YX5%6  
OM7AK B=S  
  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; fV6ddh  
'F/uD 1;  
  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; e=# D1  
lc [)Ev  
  5、 添加代码,编译运行程序。 p,(W?.ZDN?  
c*R\fQd  
三、程序代码 S5H}   
FH%: NO  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL  Ks^wX  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) N<KsQsy=  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ `|92!Ej  
#if _MSC_VER > 1000  )L":I  
#pragma once &Wdi 5T8  
#endif // _MSC_VER > 1000 0Q#}:  
#ifndef __AFXWIN_H__ fX\y/C  
#error include 'stdafx.h' before including this file for PCH qv:DpK  
#endif o7PS1qcya<  
#include "resource.h" // main symbols o1{3[=G  
class CHookApp : public CWinApp OYmutq  
{ # eFdu  
 public: ~`$P-^u88X  
  CHookApp(); G~_D'o<r  
  // Overrides ,5T1QWn^f  
  // ClassWizard generated virtual function overrides Y}C|4"V  
  //{{AFX_VIRTUAL(CHookApp) 1@TL>jq  
 public: /&czaAR-  
  virtual BOOL InitInstance(); ;Vf{3  
  virtual int ExitInstance(); 5vS[{;<&  
  //}}AFX_VIRTUAL tU!Yg"4Q  
  //{{AFX_MSG(CHookApp) 8B!QqLqK  
  // NOTE - the ClassWizard will add and remove member functions here. MlS5/9m@^  
  // DO NOT EDIT what you see in these blocks of generated code ! Q_0_6,Opb  
  //}}AFX_MSG 23'<R i  
  DECLARE_MESSAGE_MAP() S|6i]/  
}; xj AU Csq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); "HH<5  M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !`W0;0'Zg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); c|k(_#\B  
BOOL InitHotkey(); { +Wknm%  
BOOL UnInit(); oxI?7dy5  
#endif el2<W=^M  
&U([Wd?E2  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. BbL]0i  
#include "stdafx.h" =CdrhP_  
#include "hook.h" 6p&uifY}tR  
#include <windowsx.h> >b:5&s\9  
#ifdef _DEBUG *c$UIg  
#define new DEBUG_NEW ,S`F xJcE  
#undef THIS_FILE Fs=)*6}&  
static char THIS_FILE[] = __FILE__; zITxJx  
#endif /Ah'KN|EN  
#define MAX_KEY 100 NweGK  
#define CTRLBIT 0x04 im)r4={ 9  
#define ALTBIT 0x02 P{J9#.Zq&s  
#define SHIFTBIT 0x01 v:w^$]4  
#pragma data_seg("shareddata") /3sX>Rj  
HHOOK hHook =NULL; '0o^T 7C  
UINT nHookCount =0; 6rCUq  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey *]Cyc<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 6iHY{WcDj  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey -Oz! GX  
static int KeyCount =0; Cy5iEI#  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift { utnbtmu  
#pragma data_seg() hl)jE 06  
HINSTANCE hins; uc]5p(9Hb  
void VerifyWindow(); _[l&{,  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Z>X]'q03  
//{{AFX_MSG_MAP(CHookApp) F,K))325  
// NOTE - the ClassWizard will add and remove mapping macros here. q['3M<q  
// DO NOT EDIT what you see in these blocks of generated code! }5 $le]  
//}}AFX_MSG_MAP /L|x3RHs  
END_MESSAGE_MAP() TT#V'r\  
J*:_3Wsy  
CHookApp::CHookApp() 497l2}0  
{ B| M@o^Tf  
 // TODO: add construction code here, 0~DsA Ua  
 // Place all significant initialization in InitInstance j+gh*\:q  
} S+^hK1jL  
X%B$*y5  
CHookApp theApp; e5; YY  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) gv(MX ;B#  
{ FlrYXau  
 BOOL bProcessed=FALSE; bwszfPM  
 if(HC_ACTION==nCode) 4/ q BD  
 { +Oo-8f*  
  if((lParam&0xc0000000)==0xc0000000){// Key up ;'[?H0Jw'  
   switch(wParam) y~M 6  
   { %t74*cX  
    case VK_MENU: M[-/&;`f@  
     MaskBits&=~ALTBIT; fwUF5Y  
     break; $DnR[V}rR!  
    case VK_CONTROL: `/i/AZ{  
     MaskBits&=~CTRLBIT; ^AXH}g  
     break; 1L?W+zMO  
    case VK_SHIFT: 8A-*MU`+  
     MaskBits&=~SHIFTBIT; v v5rA 6+  
     break; Z}SqiT  
    default: //judge the key and send message o,0 Z^"|  
     break; _oefp*iWS  
   } fI=p^k:  
   for(int index=0;index<MAX_KEY;index++){ *UG?I|l|I  
    if(hCallWnd[index]==NULL) \-[ >bsg  
     continue; lKqFuLHwF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t.bM]QU!1  
    { ?hURNlR_Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^ 6Yt2Bhs  
     bProcessed=TRUE; xsS;<uCD  
    } Q?`s4P)14o  
   } ]zIIi%  
  } \SYeDy  
  else if((lParam&0xc000ffff)==1){ //Key down &#.>-D{  
   switch(wParam) txX>zR*)  
   { R-mn8N&  
    case VK_MENU: EF9Y=(0|  
     MaskBits|=ALTBIT; |;p.!FO  
     break; iVmy|ewd  
    case VK_CONTROL: 8R(l~  
     MaskBits|=CTRLBIT; hwi_=-SL  
     break; pm[i#V<v  
    case VK_SHIFT: 66_=bd(9  
     MaskBits|=SHIFTBIT; /h]ru SI  
     break; iorQ/(  
    default: //judge the key and send message y T&#k1  
     break; z  61Fq  
   } REsw=P!b  
   for(int index=0;index<MAX_KEY;index++) G"6XJYoI  
   { 8"V1h72vcW  
    if(hCallWnd[index]==NULL) Y%r>=Jvu6  
     continue; z XUr34jF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #60gjHYaV  
    { #nZPnc:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); P9q=tC3^  
     bProcessed=TRUE;   
    } KhL%ov  
   } }"kF<gG1  
  } l=$?#^^ /  
  if(!bProcessed){ Wk!<P" nHd  
   for(int index=0;index<MAX_KEY;index++){ ?@6Zv$vZ  
    if(hCallWnd[index]==NULL) >5 Y.  
     continue; 2nL*^hhh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) TDy$Mv=y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); WWOjck #  
   } 0&tr3!h\  
  } yDRi  
 } {/48n83n  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,*m|Lt%;R  
} g{2~G6%;0  
G6JP3dOT  
BOOL InitHotkey() ~Ra8(KocD  
{ :wUi&xw  
 if(hHook!=NULL){ rD !GEU  
  nHookCount++; 2{oQ  
  return TRUE; Np$ue }yr  
 } l2Rnyb<;;  
 else h1f 05  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); j|XL$Q  
  if(hHook!=NULL) T;S6<J  
   nHookCount++; ]kO|kIs  
  return (hHook!=NULL); :1]J{,VG  
} 1vJj?Uqc  
BOOL UnInit() ~K(mt0T )  
{ BV}sN{  
 if(nHookCount>1){ $Ny:At  
  nHookCount--; WfTl\Dxw  
  return TRUE; `9\^.g)  
 } g{K \  
 BOOL unhooked = UnhookWindowsHookEx(hHook); m)r,  
 if(unhooked==TRUE){ j;-2)ZLm  
  nHookCount=0; ]U }B~Y  
  hHook=NULL; J L1]auO*  
 } Gj[5e w?@  
 return unhooked; k_gl$`A  
} 79h'sp6;  
T?tZ?!6  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) la^K|!|  
{ _({wJ$aYC  
 BOOL bAdded=FALSE; # 00?]6`z  
 for(int index=0;index<MAX_KEY;index++){ gplrJaH@  
  if(hCallWnd[index]==0){ i#*lK7  
   hCallWnd[index]=hWnd; 7[0CVWs,  
   HotKey[index]=cKey; nXjSf  
   HotKeyMask[index]=cMask; }n"gX>e~  
   bAdded=TRUE; BhiOV_}Hn  
   KeyCount++; :" JEC'  
   break; |M18/{  
  } QpS7 nGev  
 } jI<_(T  
 return bAdded; ;sx4w!Y,  
} s'Qmr s a  
:H:+XIgoR  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) v(, tu/  
{ R+.kwq3CED  
 BOOL bRemoved=FALSE; vw-y:,5`t8  
 for(int index=0;index<MAX_KEY;index++){ h&~9?B  
  if(hCallWnd[index]==hWnd){ x]4>f[>*>  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 6(ER$  
    hCallWnd[index]=NULL; - "{hP  
    HotKey[index]=0; OgHqF,0MN  
    HotKeyMask[index]=0; 7)FYAk$@  
    bRemoved=TRUE;  OAgZeK$  
    KeyCount--; X `F>kp1  
    break; k3]qpWKj  
   } Q"3gvIyc  
  } HLL=.: P  
 } pkTVQdtRG  
 return bRemoved; ~w.y9)",  
} iDltN]zS  
^E~1%Md.  
void VerifyWindow() J-5kvQi8  
{ e-VGJxR  
 for(int i=0;i<MAX_KEY;i++){ wT-K g=-q  
  if(hCallWnd!=NULL){ 0}'/3Q  
   if(!IsWindow(hCallWnd)){ K%u>'W  
    hCallWnd=NULL; v`p@djM  
    HotKey=0; +Z]}ce u"  
    HotKeyMask=0; DUg[L  
    KeyCount--; #wkSru&LS  
   } ZQ'|B  
  } hb9HVj  
 } 0vMKyT3 c  
} vTL/% SJ8  
NW&2ca  
BOOL CHookApp::InitInstance() as!P`*@  
{ GXRW"4eF5  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); sN) xNz  
 hins=AfxGetInstanceHandle(); (.5Ft^3W  
 InitHotkey(); <vb7X  
 return CWinApp::InitInstance(); l j+p}dt  
} J5z\e@?.0\  
@CoUFdbz  
int CHookApp::ExitInstance() vZ^U]h V  
{ 7 ;2>kgf~  
 VerifyWindow(); j8^zE,Z  
 UnInit(); m8+ EMBl  
 return CWinApp::ExitInstance(); }?HWUAL\  
} A-rj: k!  
,-DU)&dF  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file !\'HKk~V  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) xl,6O!aR  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 5'<mfY'B  
#if _MSC_VER > 1000 lAGntYv  
#pragma once +x~p&,w?  
#endif // _MSC_VER > 1000 0oqOX  
JgV4-B0  
class CCaptureDlg : public CDialog 9hJ a K  
{ ZkNet>9  
 // Construction =-qYp0sVP  
 public: U r8JG&,  
  BOOL bTray; k?1e + \  
  BOOL bRegistered; y'z9Ya  
  BOOL RegisterHotkey(); ?JW/Stua  
  UCHAR cKey; Jid_&\  
  UCHAR cMask; o"kL,&  
  void DeleteIcon(); kv2 H3O  
  void AddIcon(); 2Zg%4/u,Zp  
  UINT nCount; g[\8s~g,  
  void SaveBmp(); -"XHN=H  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 7|o}m}yVx  
  // Dialog Data %zhSSB =BJ  
  //{{AFX_DATA(CCaptureDlg) 3T[zieX  
  enum { IDD = IDD_CAPTURE_DIALOG }; czB),vooz  
  CComboBox m_Key; b'vIX< g  
  BOOL m_bControl; _ D"S  
  BOOL m_bAlt; :8N{;aui  
  BOOL m_bShift; IYr}%:P)  
  CString m_Path; ;1>V7+/  
  CString m_Number; ZmJ<FF4  
  //}}AFX_DATA ?u0qYep:  
  // ClassWizard generated virtual function overrides i@ 86Ez  
  //{{AFX_VIRTUAL(CCaptureDlg) D r"PS >.  
 public: =Wz)(N  
  virtual BOOL PreTranslateMessage(MSG* pMsg); k7(lwEgNG  
 protected: k,ezB+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Qv)DSl  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); + +Eu.W;&#  
  //}}AFX_VIRTUAL ME.!l6lm\  
  // Implementation J0o,ZH9  
 protected: <~u-zaN<W  
  HICON m_hIcon; 3{TE6&HIa  
  // Generated message map functions zy|h1 .gd  
  //{{AFX_MSG(CCaptureDlg) qa4j>;  
  virtual BOOL OnInitDialog(); aY DM)b}  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); =4OV }z=I  
  afx_msg void OnPaint(); }C$D-fH8sW  
  afx_msg HCURSOR OnQueryDragIcon(); `3z6y& dmx  
  virtual void OnCancel(); ]?NiY:v  
  afx_msg void OnAbout(); tg9{(_ t/W  
  afx_msg void OnBrowse(); Zq:c2/\c}  
  afx_msg void OnChange(); lg{M\ +  
 //}}AFX_MSG /03?(n= 3  
 DECLARE_MESSAGE_MAP() NL'(/|)  
}; {s=c!08=  
#endif ^S(QvoaQ  
DU-dIq i  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file o@ L '|#e  
#include "stdafx.h" t"5ZYa  
#include "Capture.h" R?Ch8mW.!  
#include "CaptureDlg.h" };f^*KZ=0  
#include <windowsx.h> Kp!A ay  
#pragma comment(lib,"hook.lib") ]H<}6}Gd  
#ifdef _DEBUG V|/N-3M  
#define new DEBUG_NEW ?.c:k;j  
#undef THIS_FILE 6w_TL< S  
static char THIS_FILE[] = __FILE__; =%B}8$.|  
#endif *o<|^,R  
#define IDM_SHELL WM_USER+1 O>9-iqP>`d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); M} +s_h9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2;w> w#}>  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; iT+t  
class CAboutDlg : public CDialog AdzdYZiM_  
{ s=Kz9WLy  
 public: &3itBQF  
  CAboutDlg(); =p dLh  
  // Dialog Data 474 oVdGx  
  //{{AFX_DATA(CAboutDlg) }n +MVJ;dG  
  enum { IDD = IDD_ABOUTBOX }; (@bq@0g  
  //}}AFX_DATA QoMa+QTuc  
  // ClassWizard generated virtual function overrides 9Fg:   
  //{{AFX_VIRTUAL(CAboutDlg) ={jj'X9  
 protected: 5D mSgP:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support cs4IO O$  
  //}}AFX_VIRTUAL M7YbRl  
  // Implementation G{zxP%[E  
 protected: _*xY>?Aq  
  //{{AFX_MSG(CAboutDlg) |`+ (O  
  //}}AFX_MSG '}q/;}ih  
  DECLARE_MESSAGE_MAP() Gq7\b({=  
}; mt[ #=Yba  
*g4Uo{  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ![eipOX  
{ HaRx(p0  
 //{{AFX_DATA_INIT(CAboutDlg) 5JG`FRW!  
 //}}AFX_DATA_INIT om6`>I*  
} Vygh|UEo  
b$tf9$f  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) GKG:iR)  
{ +Q"XwxL<6  
 CDialog::DoDataExchange(pDX); qVvnl  
 //{{AFX_DATA_MAP(CAboutDlg) :j`XU  
 //}}AFX_DATA_MAP fe}RmnAC  
} "kKIv|`  
tv; ?W=&P  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) l>("L9  
 //{{AFX_MSG_MAP(CAboutDlg) -.-@|*5  
 // No message handlers %~0]o@LW7  
 //}}AFX_MSG_MAP 5H( ]"C  
END_MESSAGE_MAP() w*u.z(:a`  
iL~(BnsF  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) _j~y;R)  
: CDialog(CCaptureDlg::IDD, pParent) !|cM<}TF,  
{ :\%hv>}|  
 //{{AFX_DATA_INIT(CCaptureDlg) rY$ wC%  
  m_bControl = FALSE; ppeF,Q  
  m_bAlt = FALSE; V2g"5nYT  
  m_bShift = FALSE; \\Z?v,XsS  
  m_Path = _T("c:\\"); SzG?m]  
  m_Number = _T("0 picture captured."); 46H@z=5  
  nCount=0; [lz H%0 V  
  bRegistered=FALSE; AR g]GV/L  
  bTray=FALSE; <d{>[R)  
 //}}AFX_DATA_INIT ZR8y9mx2"  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 V-"#Kf9  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); aaI5x  
} SXV2Y-  
<irr .O  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) EWWCh0 {  
{ JZqJ&   
 CDialog::DoDataExchange(pDX); eUD 5 V  
 //{{AFX_DATA_MAP(CCaptureDlg) m`4N1egCt  
  DDX_Control(pDX, IDC_KEY, m_Key); KSU hB  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); af/0e}-  
  DDX_Check(pDX, IDC_ALT, m_bAlt); A>*#Nw5L  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); WISK-z  
  DDX_Text(pDX, IDC_PATH, m_Path); 52r\Q}v$  
  DDX_Text(pDX, IDC_NUMBER, m_Number); j ~I_by  
 //}}AFX_DATA_MAP 4UN|`'c  
} U?EXPi61Z  
F#RtU :R  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) T6\d]  
//{{AFX_MSG_MAP(CCaptureDlg) [5GzY`/m  
 ON_WM_SYSCOMMAND() dX-j3lM:#  
 ON_WM_PAINT() FQ/z,it_i  
 ON_WM_QUERYDRAGICON() i{r[zA]$  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) )W1[{?  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) wid  
 ON_BN_CLICKED(ID_CHANGE, OnChange) eXkpU7w;  
//}}AFX_MSG_MAP &-Q_%eM^  
END_MESSAGE_MAP() &7eN EA  
O_*tDq,e  
BOOL CCaptureDlg::OnInitDialog() _?XR;2 ]  
{ s|R`$+'{  
 CDialog::OnInitDialog(); `*B6T7p1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); [9y y<Z5  
 ASSERT(IDM_ABOUTBOX < 0xF000); 1=^|  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ayN[y  
 if (pSysMenu != NULL) LVy (O9g  
 { b >'c   
  CString strAboutMenu; O`;o"\P<  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Z[kVVE9b?  
  if (!strAboutMenu.IsEmpty()) Krr51` hZH  
  { |}d+BD  
   pSysMenu->AppendMenu(MF_SEPARATOR); c Hnd gUW]  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); |"}rC >+  
  } A|m0.'/   
 } QjTs$#eMW  
 SetIcon(m_hIcon, TRUE); // Set big icon -r[O_[g w  
 SetIcon(m_hIcon, FALSE); // Set small icon iS`ok  
 m_Key.SetCurSel(0); HUel  
 RegisterHotkey(); Q@C  y\l  
 CMenu* pMenu=GetSystemMenu(FALSE); d[p?B-7%  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); m4R:KjN*  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); $-39O3  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 9CZ EP0i7  
 return TRUE; // return TRUE unless you set the focus to a control i~m;Ah,#  
} g? C<@  
$Ut1vp1$  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) DyRU$U  
{ e )]  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) =b Q\BY#  
 { Bey9P)_Of  
  CAboutDlg dlgAbout; o9Tsyjbj  
  dlgAbout.DoModal(); :T#f&|Gg;  
 } mqiCn]8G  
 else =ibKdPtTh^  
 { L; <Pod  
  CDialog::OnSysCommand(nID, lParam); .gCun_td#  
 } hh-sm8  
} 'Ojxzz*tT  
so@ijl4{Z  
void CCaptureDlg::OnPaint() -hGLGF??  
{ g,f AV M  
 if (IsIconic()) w1+ %+x  
 { 9 ]|C$;kw@  
  CPaintDC dc(this); // device context for painting y!~ }7=  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); (^~~&/U_U$  
  // Center icon in client rectangle +y 48.5  
  int cxIcon = GetSystemMetrics(SM_CXICON); mS+sh'VH  
  int cyIcon = GetSystemMetrics(SM_CYICON); ZD<e$PxxCd  
  CRect rect; O 2+taB  
  GetClientRect(&rect); 3WPZZN<K9  
  int x = (rect.Width() - cxIcon + 1) / 2; =@d->d  
  int y = (rect.Height() - cyIcon + 1) / 2; iVb7>d9}  
  // Draw the icon /7WdG)'  
  dc.DrawIcon(x, y, m_hIcon); `_3 Gb  
 } ?4_ME3$t  
 else $WsyAUl  
 { 3k:`7E.  
  CDialog::OnPaint(); t24.u+O  
 } %D`j3cEp@  
} QF$s([  
(?[%u0%_  
HCURSOR CCaptureDlg::OnQueryDragIcon() $]J<^{v  
{ Bsj^R\  
 return (HCURSOR) m_hIcon; p,3}A( >  
} 352RJC  
;/!o0:m^I  
void CCaptureDlg::OnCancel() 3E!3kSh|  
{ pzT`.#N:M  
 if(bTray) GFvLd:p` [  
  DeleteIcon(); }RUK?:lEA  
  CDialog::OnCancel(); HgTBON(  
} =RHIB1  
?:+p#&I  
void CCaptureDlg::OnAbout() r>6FJ:Tx  
{ ]#W9l\  
 CAboutDlg dlg; `X(H,Q}*;  
 dlg.DoModal(); !_-Uwg  
} QvlV jDIy  
yL23 Nqe  
void CCaptureDlg::OnBrowse() j/1 f|x  
{ Z5@E|O&  
 CString str; mJsU7bD`  
 BROWSEINFO bi; 12l1u[TlS  
 char name[MAX_PATH]; |)[&V3+|  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); R?#.z#  
 bi.hwndOwner=GetSafeHwnd(); UTO$L|K  
 bi.pszDisplayName=name; r<DPh5ReY  
 bi.lpszTitle="Select folder"; `6v24?z  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; =0>[-:Z  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); |W5lhx0U  
 if(idl==NULL) i({MID)/_  
  return; ^$y`Q@-9  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); USKC,&6&}  
 str.ReleaseBuffer(); O ]t)`+%q  
 m_Path=str;  }D!o=Mg^  
 if(str.GetAt(str.GetLength()-1)!='\\') [f]:h Ji  
  m_Path+="\\"; .i1|U8"X  
 UpdateData(FALSE); 88l{M[B2  
} p\tA&>3-  
"J 2v8c  
void CCaptureDlg::SaveBmp() & z5:v-G?  
{ dA0o{[o=  
 CDC dc; fjm 3X$tR  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Y0ACJ?|  
 CBitmap bm; l7(p~+o?h>  
 int Width=GetSystemMetrics(SM_CXSCREEN); A" IaFXB  
 int Height=GetSystemMetrics(SM_CYSCREEN); S"@@BQ#mf  
 bm.CreateCompatibleBitmap(&dc,Width,Height); &Zo+F]3d  
 CDC tdc; D 75;Y;E  
 tdc.CreateCompatibleDC(&dc); 03!#99  
 CBitmap*pOld=tdc.SelectObject(&bm); E4<#6q  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); g+-^6UG  
 tdc.SelectObject(pOld); dlMjy$/T  
 BITMAP btm; ESuP ZB  
 bm.GetBitmap(&btm); '2SZ]   
 DWORD size=btm.bmWidthBytes*btm.bmHeight; U}GO* +  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); _!%@V=  
 BITMAPINFOHEADER bih; A9z3SJ\vXl  
 bih.biBitCount=btm.bmBitsPixel; xiF}{25a  
 bih.biClrImportant=0; vQ >8>V  
 bih.biClrUsed=0; Lv *USN  
 bih.biCompression=0; SGpe\P]k  
 bih.biHeight=btm.bmHeight; [>lQi X  
 bih.biPlanes=1; &H2j3De  
 bih.biSize=sizeof(BITMAPINFOHEADER); \+<=O`  
 bih.biSizeImage=size; d26#0Gt-4i  
 bih.biWidth=btm.bmWidth; ;bFd*8?;  
 bih.biXPelsPerMeter=0; ~l*[=0}  
 bih.biYPelsPerMeter=0; Q fL8@W~e  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @QDpw1;V'  
 static int filecount=0; tZ:fh  p  
 CString name; DN;$ ->>  
 name.Format("pict%04d.bmp",filecount++); 9+~1# |  
 name=m_Path+name; =27ZY Z  
 BITMAPFILEHEADER bfh; ' ?EG+o8  
 bfh.bfReserved1=bfh.bfReserved2=0; )2R]KU_=g  
 bfh.bfType=((WORD)('M'<< 8)|'B'); srH.$Y;~  
 bfh.bfSize=54+size; Bd[H@oKru  
 bfh.bfOffBits=54; ZpZoOdjslV  
 CFile bf; NFI~vkk'G  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 7Kt i&T  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); a)!R4  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); *]ME]2qP  
  bf.WriteHuge(lpData,size); 8x9;3{R   
  bf.Close(); #y1M1Og  
  nCount++; vyT-!mC  
 } $LtCI  
 GlobalFreePtr(lpData); >n%ckL|rG  
 if(nCount==1) Ee=!bv(%70  
  m_Number.Format("%d picture captured.",nCount); iGNZC{  
 else 1:4u]$@E  
  m_Number.Format("%d pictures captured.",nCount); E/_n}$Z  
  UpdateData(FALSE); Cm-dos  
} h2 >a_0"  
1JZhcfG  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) zvT8r(<n}  
{ _;:B@Z  
 if(pMsg -> message == WM_KEYDOWN) ^vTp.7o~5  
 { .xtam 8@  
  if(pMsg -> wParam == VK_ESCAPE) cgR8+o  
   return TRUE; h-\+# .YP  
  if(pMsg -> wParam == VK_RETURN) *?o 'sTH  
   return TRUE; %%lJyLq'Vk  
 } 9dp1NjOtAc  
 return CDialog::PreTranslateMessage(pMsg); #YSFiy:+r_  
} }jYVB|2  
isz-MP$:K5  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @y,>cDg  
{ #W/ATsDt  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ b3q&CJ4|  
  SaveBmp(); /=KEM gI?  
  return FALSE; K%;=i2:  
} AdRK)L  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `Nv7c{M^  
 CMenu pop; KnUVR!H|  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !Za yN  
 CMenu*pMenu=pop.GetSubMenu(0); P#AS")Sj  
 pMenu->SetDefaultItem(ID_EXITICON); HcHwvf6y  
 CPoint pt; vP,$S^7$  
 GetCursorPos(&pt); O*c<m,  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); l@>@2CB  
 if(id==ID_EXITICON) / &yc?Ui  
  DeleteIcon(); Q 2 B  
 else if(id==ID_EXIT) ex|h&Vma2V  
  OnCancel(); #m3!U(Og`  
 return FALSE; _hEr,IX=J  
} =an 0PN  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); c>wn e\(5H  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) v R ! y#  
 AddIcon(); 4C9k0]k2  
 return res; %4Yq (e  
} \Z-Fu=8J8^  
^[b DE0  
void CCaptureDlg::AddIcon() |^OK@KdL1  
{ Uq.hCb`:  
 NOTIFYICONDATA data; B9]bv]  
 data.cbSize=sizeof(NOTIFYICONDATA); BxesoB  
 CString tip; <6C:\{eo  
 tip.LoadString(IDS_ICONTIP); )%HIC@MM6  
 data.hIcon=GetIcon(0); RT[ E$H  
 data.hWnd=GetSafeHwnd(); E*QLw* H  
 strcpy(data.szTip,tip); ;+lsNf  
 data.uCallbackMessage=IDM_SHELL; VBK|*Tl  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; V/yj.aA*@  
 data.uID=98; Sea6xGdq  
 Shell_NotifyIcon(NIM_ADD,&data); Nu+DVIM  
 ShowWindow(SW_HIDE); z]!w@:  
 bTray=TRUE; rf]x5%ij  
} rg I Z  
|]b,% ?,U  
void CCaptureDlg::DeleteIcon() 2Vx x  
{ >*$Xbj*  
 NOTIFYICONDATA data; )<.y{_QUN  
 data.cbSize=sizeof(NOTIFYICONDATA); '-P+|bZW4  
 data.hWnd=GetSafeHwnd(); dAi.^! !  
 data.uID=98; WLCr~r^  
 Shell_NotifyIcon(NIM_DELETE,&data); 5X:3'*  
 ShowWindow(SW_SHOW); W4)bEWO+q  
 SetForegroundWindow(); yn.[-  
 ShowWindow(SW_SHOWNORMAL); TpxAp',#7  
 bTray=FALSE; u"DE?  
} CM)V^k*  
<>V~  
void CCaptureDlg::OnChange() Ka$lNL3<j  
{ s $ ?;C  
 RegisterHotkey(); 40 zO4  
} mcxD#+H 3  
)QI#szv6  
BOOL CCaptureDlg::RegisterHotkey() 7nZ3u _~  
{ imyfki $B  
 UpdateData(); _Zxo <}w}y  
 UCHAR mask=0; >".@;  
 UCHAR key=0; -cP1,>Ahv  
 if(m_bControl) 877Kv);  
  mask|=4; p Moza8  
 if(m_bAlt) ;&MnPFmq  
  mask|=2; `k(m2k ?  
 if(m_bShift) 8[:G/8VI  
  mask|=1; Nop61zj  
  key=Key_Table[m_Key.GetCurSel()]; "_:6v64Gx  
 if(bRegistered){ yh.WTgcW  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); K+Pa b ?  
  bRegistered=FALSE; Wlp`D  
 } C#L|7M??;  
 cMask=mask; \xmDkWzE  
 cKey=key; _AH_<Z(  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); <|hrmwk|  
 return bRegistered; R0-Y2v  
} c,#Nd@  
*pyC<4W  
  四、小结 JX`>N(K4\  
BJ{?S{"6%G  
  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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