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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: PxWT1 !  
  ,1~"eGl!  
  一、实现方法 XKj|f`  
]#)()6)2v  
  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: ?PuBa`zDE  
! `   
#pragma data_seg("shareddata") ] {RDVA=]  
HHOOK hHook =NULL; //钩子句柄 Ta ZmRL  
UINT nHookCount =0; //挂接的程序数目 !"?#6-,Xn  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 hgYZOwQ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 0fb2;&pUa  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ^S4d:-.3  
static int KeyCount =0; b[r8 e  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 dI.WK@W'o  
#pragma data_seg() w1Nm&}V  
g0xuxK;9c  
  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。 "h{q#~s  
hO\<%0F  
  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: .F4>p=r  
[_R~%Yh+'E  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ,k +IPkN+  
cKey,UCHAR cMask) CpUk Cgg  
{ [\^ n=  
 BOOL bAdded=FALSE; x[FJgI'r  
 for(int index=0;index<MAX_KEY;index++){ lHN5Dr  
  if(hCallWnd[index]==0){ sXLq*b?  
   hCallWnd[index]=hWnd; ^bGNq X  
   HotKey[index]=cKey; \pa"%c)  
   HotKeyMask[index]=cMask; ]R+mKUZ9  
   bAdded=TRUE; {2O1"|s ,  
   KeyCount++; gh/EU/~d  
   break; /hr7NT{e%v  
  } hQ,ch[j'  
 } Sj%u)#Ub  
 return bAdded; >{q]&}^U  
} 'F+C4QAq  
//删除热键 [<lHCQXJ/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) G,&<<2{(f;  
{ 7-bd9uVK  
 BOOL bRemoved=FALSE; F&!6jv  
 for(int index=0;index<MAX_KEY;index++){ zJq~!#pZ  
  if(hCallWnd[index]==hWnd){ j8v8uZ;x  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ RD!&LFz/}  
    hCallWnd[index]=NULL; &jS>UsGh  
    HotKey[index]=0; l.67++_  
    HotKeyMask[index]=0; |XaIx#n  
    bRemoved=TRUE; 8 }I$'x  
    KeyCount--; ~Otq %MQ  
    break; #{\J Nb+w%  
   } h9t$Uz^N  
  } MU`1LHg  
 } &|s0P   
 return bRemoved; R6` WN  
} [T8WThs  
%|s; C  
KoOz#,()  
  DLL中的钩子函数如下: rMdt:`  
?h$NAL?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ef 8s<5"4  
{ AHD=<7Rs  
 BOOL bProcessed=FALSE; ]0Y4U7W  
 if(HC_ACTION==nCode) ,82S=N5V!  
 { A!od9W6  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Y>dF5&(kb  
   switch(wParam) /K+r? ]kf  
   {  rJ`!:f  
    case VK_MENU: p)KheLiZ  
     MaskBits&=~ALTBIT; &y\prip  
     break; 1h^:[[!c  
    case VK_CONTROL: m]'#t)B_m  
     MaskBits&=~CTRLBIT; y*4=c _Z  
     break; 0pZ4BZdT|  
    case VK_SHIFT: {j{u6i  
     MaskBits&=~SHIFTBIT; 8o3E0k1  
     break; NxkGOAOE  
    default: //judge the key and send message ..IfP@  
     break; Y4J3-wK5  
   } j_qbAP  
   for(int index=0;index<MAX_KEY;index++){ dH;8mb|#'  
    if(hCallWnd[index]==NULL) ~uj#4>3T  
     continue; ,1y@Z 5wy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {kA0z2Fe  
    { Yk'XGr)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6LvW?z(J  
     bProcessed=TRUE; Lm iOhx  
    } b:U$x20n$  
   } .iYJr;9`d  
  } @KXV%a'  
  else if((lParam&0xc000ffff)==1){ //有键按下 BGvre'67  
   switch(wParam) FI)17i$  
   { &agWaf1%a  
    case VK_MENU: ` )/vq-9  
     MaskBits|=ALTBIT; [zH:1Zhl&  
     break; ncZ+gzK|"  
    case VK_CONTROL: 4zXFuTr($  
     MaskBits|=CTRLBIT; aHV;N#Lx3  
     break; 3(="YbZ  
    case VK_SHIFT: qz"}g/;?  
     MaskBits|=SHIFTBIT; "H=6j)Cb  
     break; Lz |? ek7Q  
    default: //judge the key and send message 1XrO~W\=  
     break; &yct!YOB2  
   } _?-E7:Sw  
   for(int index=0;index<MAX_KEY;index++){ LGq'WU31:)  
    if(hCallWnd[index]==NULL) DF&(8NoX~  
     continue; J! AgBF N4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I&fozO   
    { } +TORR?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); a[>/h3  
     bProcessed=TRUE; wx]0p  
    } IQAZuN"<  
   } 4svBzZdr  
  } Z&G+bdA>,  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 |hKDvH  
   for(int index=0;index<MAX_KEY;index++){ 034iK[ib"  
    if(hCallWnd[index]==NULL) |T<_5Ik  
     continue; '50OgF'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) K='z G*$l  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); r7RIRg_  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 R8Wr^s>'  
   } N+9VYH"*  
  } )~GmU9f  
 } E:,/!9n  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); sv2A-Dld  
} Q1T$k$n  
IDad9 Bx  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: kVuUjP6(c  
fJ=0HNmX  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); l^! ?@Kg,z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5us:adm[pD  
X@--m6-  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: >,v`EIg  
eln)BW#  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) y|jl[pyg)  
{ [ZNtCnv  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) zKyyU}LHH  
 { b10cuy|a/X  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ;d@#XIS&-(  
  SaveBmp(); 'S20\hwt-  
  return FALSE; 3#W T.4k  
 } h! M  
 …… //其它处理及默认处理 MH =%-S   
} FDv<\2+ c  
kS%Ydy#:'  
6{@w="VT  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 C0sX gM  
Vouvr<43o  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 g!|=%(G=  
p99 ]  
  二、编程步骤 <3oWEm  
I~[F|d>  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; el&0}`K  
{IjF+@I  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; bc7/V#W  
3BzNi'  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; !-g{[19\  
&r[`>B{tP  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; <S5BDk  
UgRhWV~f0  
  5、 添加代码,编译运行程序。  |{&{  
d}OTO10  
三、程序代码 , xw#NG6  
imVo<Je7z(  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL UI0( =>L  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) !({}(!P .  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ a`wc\T^  
#if _MSC_VER > 1000 FW;m\vu  
#pragma once , |0}<%  
#endif // _MSC_VER > 1000 .14~J6  
#ifndef __AFXWIN_H__ #F:p-nOq  
#error include 'stdafx.h' before including this file for PCH 2kqup)82e  
#endif q'+)t7!  
#include "resource.h" // main symbols |e=,oV"  
class CHookApp : public CWinApp ay4 %  
{ \Yy$MLs  
 public: ['b}QW@Fx  
  CHookApp(); Z/G ev"p  
  // Overrides Ah1]Y}sy  
  // ClassWizard generated virtual function overrides M "ui0 ac  
  //{{AFX_VIRTUAL(CHookApp)  hz{`h  
 public: BfXgh'Z~  
  virtual BOOL InitInstance(); K> %Tq  
  virtual int ExitInstance(); 0q^>ZF-@  
  //}}AFX_VIRTUAL x!hh"x  
  //{{AFX_MSG(CHookApp) _PPy44r2  
  // NOTE - the ClassWizard will add and remove member functions here. 2"COP>  
  // DO NOT EDIT what you see in these blocks of generated code ! oph}5Krd)  
  //}}AFX_MSG HUcq% .  
  DECLARE_MESSAGE_MAP() 6 [k\@&V-  
}; .4S.>~^7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ]z;P9B3@&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6S},(=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O],T,Z?z  
BOOL InitHotkey(); 9U7nKJ+iby  
BOOL UnInit(); ,t3wp#E2#  
#endif k3~}7]O)  
bjyZk_\  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. OwuE~K7b{  
#include "stdafx.h" aasoW\UG  
#include "hook.h" FOb0uj=(v  
#include <windowsx.h> c7?_46 J  
#ifdef _DEBUG O8^A5,2@3>  
#define new DEBUG_NEW ,yC-+VL  
#undef THIS_FILE 9q)Kfz  
static char THIS_FILE[] = __FILE__; N>Xo_-QCY  
#endif `34zkPB??  
#define MAX_KEY 100 j 'FVz&  
#define CTRLBIT 0x04 4"GR] X  
#define ALTBIT 0x02 W,D4.w$@'  
#define SHIFTBIT 0x01 C^s^D:   
#pragma data_seg("shareddata") {ba q+  
HHOOK hHook =NULL; =NpYFKmMhV  
UINT nHookCount =0; FW.7'7G@n  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 84$nT>c  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ?xA:@:l/  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey XFg 9P}"  
static int KeyCount =0; 'Jiw@t<o3`  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 9y6-/H ,  
#pragma data_seg() AJt+p&I[J  
HINSTANCE hins; `K*Q5n  
void VerifyWindow(); Qd)q([  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) PYiU_  
//{{AFX_MSG_MAP(CHookApp) md=TjMaY  
// NOTE - the ClassWizard will add and remove mapping macros here. )S3\,S-.  
// DO NOT EDIT what you see in these blocks of generated code! "Hya6k>j  
//}}AFX_MSG_MAP >/{@C  
END_MESSAGE_MAP() 9K.Vb1&  
&]V.S7LC #  
CHookApp::CHookApp() 7Sf bx~48  
{ Uq[>_"}  
 // TODO: add construction code here, uyO/55;HO  
 // Place all significant initialization in InitInstance m&xW6!x  
} ``V" D  
Y)1PB+  
CHookApp theApp; lvdf^b/ j  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) LU \i0|i|  
{ #r$cyV!k  
 BOOL bProcessed=FALSE; Ki4r<>\l{H  
 if(HC_ACTION==nCode) )(A]Ln4  
 { q6@Lp^f  
  if((lParam&0xc0000000)==0xc0000000){// Key up tI]Q%S,  
   switch(wParam) RW|`nL  
   { l~1Oef#y  
    case VK_MENU: &]g}u5J!=  
     MaskBits&=~ALTBIT; 6 uv#de  
     break; bNm#tmSt  
    case VK_CONTROL: 6O|@xvg  
     MaskBits&=~CTRLBIT; oOnop-z7  
     break; .RE:;<|w  
    case VK_SHIFT: w+C7BPV&  
     MaskBits&=~SHIFTBIT; t\?ik6  
     break; rr+|Zt Y  
    default: //judge the key and send message V n7*JS  
     break; vV6<^ W:9F  
   } Sw:7pByjI  
   for(int index=0;index<MAX_KEY;index++){ &[_g6OL  
    if(hCallWnd[index]==NULL) H[{F'c[e  
     continue; E8!e:l =Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) LVX[uWEM  
    { d<% z 1Dj2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); B%" d~5Y  
     bProcessed=TRUE; 81](T<  
    } !4]T XH0f  
   } O80<Z#%j`  
  } {^ qcx8  
  else if((lParam&0xc000ffff)==1){ //Key down 6,o~\8ia  
   switch(wParam) pqk?|BvpK_  
   { H0:E(}@   
    case VK_MENU: NYyh|X:m  
     MaskBits|=ALTBIT; gRrL[z  
     break; g=39C>  
    case VK_CONTROL: X]'{(?Ch  
     MaskBits|=CTRLBIT; 2I%MAb&1@  
     break; %;cddLQ\xY  
    case VK_SHIFT: ydFD!mO  
     MaskBits|=SHIFTBIT; VA WF3  
     break; *Tas`WA  
    default: //judge the key and send message yGI;ye'U  
     break;  0bz'&  
   } ?@BTGUK"C  
   for(int index=0;index<MAX_KEY;index++) .Fs7z7?Y  
   { 2n3W=dF  
    if(hCallWnd[index]==NULL) yaD~1"GA'O  
     continue; ,C K{F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) E d"h16j?z  
    { e 63uLWDT  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4h~iPn'Wl  
     bProcessed=TRUE; +$u$<z3Q  
    } ?QsQnQ  
   } 'GB. UKlR  
  } YbR!+ 0\g  
  if(!bProcessed){ +lm{Olm'^  
   for(int index=0;index<MAX_KEY;index++){ 4F)-"ck  
    if(hCallWnd[index]==NULL) .)RzT9sg  
     continue; Mc=$/ o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) OJ,`  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); uPhK3nCGo  
   } t,,k  
  } 6tXq:  
 } Ci?Ss+|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); x8wD0D  
} GU4'&#  
4P'*umJi  
BOOL InitHotkey() !5.8]v  
{ OSlvwH%(EE  
 if(hHook!=NULL){ M}d_I+  
  nHookCount++; %Qc La//  
  return TRUE; Hcl(3> Jn2  
 } >v:y?A,  
 else 5Ec6),+&  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); t=|evOz]  
  if(hHook!=NULL) (gy#js #  
   nHookCount++; X59: C3c  
  return (hHook!=NULL); 0":ib0=  
} ?6yjy<D)$e  
BOOL UnInit() z,Medw6[  
{ Xp >7iX!:  
 if(nHookCount>1){ u&`XB|~  
  nHookCount--; >CrA;\l  
  return TRUE; d_CKP"TA  
 } 0>C T=(A  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 0C1pt5K  
 if(unhooked==TRUE){ o4j[p3$  
  nHookCount=0; Gnf~u[T6  
  hHook=NULL; O?)3VT*  
 } y603$Cv  
 return unhooked; j2ve^F:Q  
} rQk<90Ar  
K!:azP,bZ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ozAS[B6  
{ '{E@*T /<.  
 BOOL bAdded=FALSE; 8WtsKOno  
 for(int index=0;index<MAX_KEY;index++){ %JXE5l+pJ  
  if(hCallWnd[index]==0){ W=vG$  
   hCallWnd[index]=hWnd; DKne'3pH  
   HotKey[index]=cKey; TFH\K{DM  
   HotKeyMask[index]=cMask; mk1bcK9  
   bAdded=TRUE; SNfr"2c'h~  
   KeyCount++; Px$/ _`H  
   break; 0TCBQ~"  
  } {aY%gk?y#>  
 } plUZ"Tr  
 return bAdded; M\sN@+  
} ]+(6,ct&.  
mFg<dTx0c8  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `!XY]PI+e  
{ iJ~Zkd  
 BOOL bRemoved=FALSE; uZc`jNc\  
 for(int index=0;index<MAX_KEY;index++){ .l>77zM6  
  if(hCallWnd[index]==hWnd){ #z&& M"*a|  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ X*M#FT-  
    hCallWnd[index]=NULL; |kw)KEi}H  
    HotKey[index]=0; U F?H>Y&  
    HotKeyMask[index]=0; iTFdN}U  
    bRemoved=TRUE; d\p,2  
    KeyCount--; ;gBRCZ  
    break; 0*rQ3Z  
   } N03HQp)g  
  } (&}i`}v_  
 } ,a gc  
 return bRemoved; !_`&Wks  
} sArhZ[H  
Y<mej][  
void VerifyWindow() E}Y!O"CAV  
{ )f}YW/'  
 for(int i=0;i<MAX_KEY;i++){ crqpV F]1]  
  if(hCallWnd!=NULL){ ?3%` bY+3;  
   if(!IsWindow(hCallWnd)){ _9JhL:cY  
    hCallWnd=NULL; cV 5CaaL  
    HotKey=0; 6I1,:nLL<  
    HotKeyMask=0; $]{k+Jf  
    KeyCount--; iMIlZ  
   } ]vgB4~4#LP  
  } ;ado0-VQi'  
 } T^w36}a  
} LJ*q1 ;<E  
t *1u[~=  
BOOL CHookApp::InitInstance() 5|l* `J)  
{ e?opkq\f  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); IIg^FZ*]_  
 hins=AfxGetInstanceHandle(); LNrX;{ Z  
 InitHotkey(); MZlk0o2  
 return CWinApp::InitInstance(); 9/hrjItV  
} OlAs'TE^  
Q?3Gk%T0[  
int CHookApp::ExitInstance() *"D3E7AO  
{ 5"HV BfFk  
 VerifyWindow(); ?*E'^~,H)  
 UnInit(); ]Bm/eRy"  
 return CWinApp::ExitInstance(); ?mWw@6G,  
} q8^^H$<Db  
%F!1  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file #>%X_o-o23  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) G>wqt@%r9  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ twP,cyR  
#if _MSC_VER > 1000 Fb^:V4<T  
#pragma once RnhL< Ywu  
#endif // _MSC_VER > 1000 ,_yh z0.  
/x5rf  
class CCaptureDlg : public CDialog Pm lx8@D  
{ nX(+s*Y+w  
 // Construction %;e/7`>Ma  
 public: )^4\,u\@  
  BOOL bTray; T(e!_VY|m  
  BOOL bRegistered; 3T"j)R_=l  
  BOOL RegisterHotkey(); > `n,S  
  UCHAR cKey; m\$\ 09  
  UCHAR cMask; &m|wH4\  
  void DeleteIcon();  AT9q3  
  void AddIcon(); T-5nB>)  
  UINT nCount; h&`e) a>+  
  void SaveBmp(); Hz.(qW">5*  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 5$wpL(:R(  
  // Dialog Data :|Ad:fEs  
  //{{AFX_DATA(CCaptureDlg) u[ L`-zI  
  enum { IDD = IDD_CAPTURE_DIALOG }; Ytz)d/3T  
  CComboBox m_Key; ZHGC6a!a  
  BOOL m_bControl; s}jHl8  
  BOOL m_bAlt; fRtUvC-#H  
  BOOL m_bShift; dgA-MQ5{  
  CString m_Path; MxGu>r  
  CString m_Number; }z\_;\7  
  //}}AFX_DATA 9T |IvQK8  
  // ClassWizard generated virtual function overrides RAG3o-  
  //{{AFX_VIRTUAL(CCaptureDlg) s<oNE)xe  
 public: NR -!VJQ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); !1q 9+e  
 protected: E}sO[wNPf  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support q)Fq i  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); e'0{?B  
  //}}AFX_VIRTUAL Md0 s K  
  // Implementation EmODBTu+  
 protected: -PS#Z0>  
  HICON m_hIcon; ve% xxn:  
  // Generated message map functions \8<BLmf4U  
  //{{AFX_MSG(CCaptureDlg) Hm$=h>rY9[  
  virtual BOOL OnInitDialog(); \>C YC|  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); @6mBqcE'?  
  afx_msg void OnPaint(); 'Y56+P\u  
  afx_msg HCURSOR OnQueryDragIcon(); xZ4~Oo@@_'  
  virtual void OnCancel(); Z00+!Tnd  
  afx_msg void OnAbout(); P?t" jKp'  
  afx_msg void OnBrowse(); qIY~dQ|  
  afx_msg void OnChange(); P@,nA41,j  
 //}}AFX_MSG KuMF^0V%c  
 DECLARE_MESSAGE_MAP() |1b_3?e  
}; agjv{  
#endif wi4=OU1L)a  
'ow.=1N-  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ?r?jl;A&  
#include "stdafx.h" UN zlN  
#include "Capture.h" -5T=:2M  
#include "CaptureDlg.h" :_t}QP"  
#include <windowsx.h> J2j U4mR  
#pragma comment(lib,"hook.lib") i{ \%e  
#ifdef _DEBUG \'9PZ6q{  
#define new DEBUG_NEW cG?cUw).E  
#undef THIS_FILE n84GZ5O>7  
static char THIS_FILE[] = __FILE__; | fSe>uVZ  
#endif U7I qST  
#define IDM_SHELL WM_USER+1 x\J#]d.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /\H>y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); LE*h9((  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; aj?a^}X  
class CAboutDlg : public CDialog 'JNElXqrv  
{ {W]=~*w  
 public: ]79:yMD~ba  
  CAboutDlg(); ox%9Ph  
  // Dialog Data N_pJk2E  
  //{{AFX_DATA(CAboutDlg) zOGU8Wg  
  enum { IDD = IDD_ABOUTBOX }; ^_ kJKM,  
  //}}AFX_DATA 4H|(c[K;  
  // ClassWizard generated virtual function overrides xj[(P$,P  
  //{{AFX_VIRTUAL(CAboutDlg) xia|+  
 protected: ap{2$k ,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O9g{+e`  
  //}}AFX_VIRTUAL :%sXO  
  // Implementation FIbp"~  
 protected: TpHfS]W-P  
  //{{AFX_MSG(CAboutDlg) s%2v3eb  
  //}}AFX_MSG L3n_ 5|  
  DECLARE_MESSAGE_MAP() *&d<yJM`b  
}; (ZY@$''  
V^\8BVw  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) [-)r5Dsdq  
{ i} N8(B(  
 //{{AFX_DATA_INIT(CAboutDlg) HO[wTB|D]  
 //}}AFX_DATA_INIT ' 4E R00  
} ET[k pL  
TOoQZTI  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) r\blyWi  
{ k%E2n:|*  
 CDialog::DoDataExchange(pDX); 04*6(L)h*  
 //{{AFX_DATA_MAP(CAboutDlg) KID,|K  
 //}}AFX_DATA_MAP A0Zt8>w  
} bzvh%RsW  
E@P %v{)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Qu7T[ <  
 //{{AFX_MSG_MAP(CAboutDlg) >P/][MT  
 // No message handlers xY$iz)^0&  
 //}}AFX_MSG_MAP r" K':O6y  
END_MESSAGE_MAP() ;>AL`M+  
ONCnVjZ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) YSj+\Z$(  
: CDialog(CCaptureDlg::IDD, pParent) P1NJ^rX  
{ .58qL-iC  
 //{{AFX_DATA_INIT(CCaptureDlg) 4WE6fJ2X  
  m_bControl = FALSE; m\ddp_l  
  m_bAlt = FALSE; a\%xB >LX  
  m_bShift = FALSE; |gsE2vV  
  m_Path = _T("c:\\"); P|HKn,ar  
  m_Number = _T("0 picture captured."); i,|0@Vy  
  nCount=0; OQ,NOiNkap  
  bRegistered=FALSE; ?_v{| YI=  
  bTray=FALSE; V13BB44  
 //}}AFX_DATA_INIT @c ~)W8  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 BbRBT@  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); '(dz"PL.  
} QMsHC%l3b  
2CzaL,je[  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) AQc,>{Lm  
{ ?X5]i#j[  
 CDialog::DoDataExchange(pDX); UThB7(O,  
 //{{AFX_DATA_MAP(CCaptureDlg) Nx-uQ^e*1  
  DDX_Control(pDX, IDC_KEY, m_Key); 5l,ZoB8  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Fh*j#*oe  
  DDX_Check(pDX, IDC_ALT, m_bAlt); wQ%mN[  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Uz7^1.-g4  
  DDX_Text(pDX, IDC_PATH, m_Path); 0v]?6wX  
  DDX_Text(pDX, IDC_NUMBER, m_Number); l$YC/ bP  
 //}}AFX_DATA_MAP VL[kJi   
} vA X|hwn;  
vBsP+K  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Q43|U4a  
//{{AFX_MSG_MAP(CCaptureDlg) E7Ulnvd  
 ON_WM_SYSCOMMAND() 8kbY+W%n  
 ON_WM_PAINT() g/&T[FOr  
 ON_WM_QUERYDRAGICON() t!2(7=P30(  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Vf`7V$sr  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 5BR2?hO4  
 ON_BN_CLICKED(ID_CHANGE, OnChange) wP57Pf0  
//}}AFX_MSG_MAP [j"9rO" +  
END_MESSAGE_MAP() *#TYqCc+g  
{VP$J"\e  
BOOL CCaptureDlg::OnInitDialog() k64."*X  
{ JMCW}bA  
 CDialog::OnInitDialog(); qiZO _=0  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); NWd<+-pC6  
 ASSERT(IDM_ABOUTBOX < 0xF000); 4Td{;Y="yF  
 CMenu* pSysMenu = GetSystemMenu(FALSE); (o J9k[(  
 if (pSysMenu != NULL)  `juLQH  
 { ZbT/$\0(6  
  CString strAboutMenu; KE1ao9H8wR  
  strAboutMenu.LoadString(IDS_ABOUTBOX); zh $}~RG[  
  if (!strAboutMenu.IsEmpty()) l?iSxqdT  
  { \@>b;4Fb+N  
   pSysMenu->AppendMenu(MF_SEPARATOR); 7t?*  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); (n1Bh~R^  
  } = 0- $W5E  
 } U;n*j3wT  
 SetIcon(m_hIcon, TRUE); // Set big icon r|*&GHo L  
 SetIcon(m_hIcon, FALSE); // Set small icon ql GW.jY.  
 m_Key.SetCurSel(0); jAh2N3)  
 RegisterHotkey(); 1.D-FPK  
 CMenu* pMenu=GetSystemMenu(FALSE); $HG}[XD?  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); fA=#Fzk2  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); n$aA)"A #  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); J>^\oAgpE  
 return TRUE; // return TRUE unless you set the focus to a control f""`cdqAOh  
} ms_ VM>l  
]?h`:,]  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [Px'\ nVf  
{ a,Gxm!  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) %hN.ktZ/s  
 { 4 V1bLm  
  CAboutDlg dlgAbout; ,+;:3gRk9  
  dlgAbout.DoModal(); @R m-CWa  
 } D{v8q)5r  
 else `p'Q7m2y/b  
 { 7n o5b] \  
  CDialog::OnSysCommand(nID, lParam); XM<KF &pVB  
 } x"4} isp<  
} \7z^!m  
Ke-)vPc  
void CCaptureDlg::OnPaint() Wy]^Ub gW  
{ ,&Wn [G<2  
 if (IsIconic()) rtQHWRUn  
 { a{[+<8=@1  
  CPaintDC dc(this); // device context for painting $DBGLmw  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); @FN*TJ  
  // Center icon in client rectangle y[@\j9Hq  
  int cxIcon = GetSystemMetrics(SM_CXICON); 93IFcmO.H@  
  int cyIcon = GetSystemMetrics(SM_CYICON); "7d-z<^n  
  CRect rect; q4UA]+-*  
  GetClientRect(&rect); =N);v\ Q$!  
  int x = (rect.Width() - cxIcon + 1) / 2; O9(r{Vu7u  
  int y = (rect.Height() - cyIcon + 1) / 2; `Y40w#?uW  
  // Draw the icon 0)m8)!gj  
  dc.DrawIcon(x, y, m_hIcon); LwuF0\  
 } @mt0kV9  
 else \uG`|D n  
 { -xg2q V\c  
  CDialog::OnPaint(); uE=$p)  
 } m6 s7F/  
} ]v G{kAnH  
CnN9!~]"  
HCURSOR CCaptureDlg::OnQueryDragIcon() U"f ??y%)  
{ fQnwy!-\  
 return (HCURSOR) m_hIcon; sP'0Sl~NU  
} 1\L[i];L8  
(x;g/!:  
void CCaptureDlg::OnCancel() mgZf3?,)  
{ 1x~U*vbhQ  
 if(bTray) 0(8H;T  
  DeleteIcon(); w> xV  
  CDialog::OnCancel(); ]+DI.%   
} .w6eJ4 ]  
4*Z6}"  
void CCaptureDlg::OnAbout() uqyB5V0gh  
{ "k$JP  
 CAboutDlg dlg; d h^^G^  
 dlg.DoModal(); ~F, &GH  
} EA<}[4#jS  
|rRG=tG_'  
void CCaptureDlg::OnBrowse() ]7AX%EG3  
{ lz | 64J  
 CString str; }iBC@`mg(  
 BROWSEINFO bi; c:M$m3Cs?  
 char name[MAX_PATH]; 02JL*  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); vOI[Z0Lq9h  
 bi.hwndOwner=GetSafeHwnd(); -m 5}#P89  
 bi.pszDisplayName=name; *B)yy[8j+  
 bi.lpszTitle="Select folder"; ;P?q2jI  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; FrTg4  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); M] V.!z9B  
 if(idl==NULL) {Z{o"56f  
  return; '_+9y5  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ^b?2N/m@  
 str.ReleaseBuffer(); 2 4\g bv<  
 m_Path=str; [IM%b~j(^  
 if(str.GetAt(str.GetLength()-1)!='\\') "L& k)J  
  m_Path+="\\"; g+zJ?  
 UpdateData(FALSE); MN= sIP,zk  
} JbQZ!+  
^%oUmwP<$  
void CCaptureDlg::SaveBmp() 5iFV;W  
{ VFD%h }  
 CDC dc; MN;/*t  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); cJ}QXuuUv  
 CBitmap bm; nw'-`*'rj  
 int Width=GetSystemMetrics(SM_CXSCREEN); CidM(  
 int Height=GetSystemMetrics(SM_CYSCREEN); eo#^L}  
 bm.CreateCompatibleBitmap(&dc,Width,Height); #$'"cfRxc  
 CDC tdc; r;cV&T/?  
 tdc.CreateCompatibleDC(&dc); R -elIp  
 CBitmap*pOld=tdc.SelectObject(&bm); :_dICxaLZT  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); K3$` Kv>I  
 tdc.SelectObject(pOld); 5a8>g [2U  
 BITMAP btm; \Xg?Ug*9w  
 bm.GetBitmap(&btm); )+O r  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; h!]"R<QQdu  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); X.|Ygx  
 BITMAPINFOHEADER bih; v1[_}N9f>H  
 bih.biBitCount=btm.bmBitsPixel; 0^!Gib  
 bih.biClrImportant=0; hY \{|  
 bih.biClrUsed=0; p_terD:  
 bih.biCompression=0; 4,eQW[;kk  
 bih.biHeight=btm.bmHeight; _ptP[SV^j  
 bih.biPlanes=1; u"VS* hSH  
 bih.biSize=sizeof(BITMAPINFOHEADER); K!8zwb=fq  
 bih.biSizeImage=size; Aa(<L$e!`  
 bih.biWidth=btm.bmWidth; m24v@?*  
 bih.biXPelsPerMeter=0; +GNWF% zN  
 bih.biYPelsPerMeter=0; $G?(OWI}l`  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 0my9l;X   
 static int filecount=0; 7t(Y;4<2  
 CString name; }#N]0I)JI  
 name.Format("pict%04d.bmp",filecount++); o$bUY7_  
 name=m_Path+name; _3^y|_!  
 BITMAPFILEHEADER bfh; I^0 t2[M  
 bfh.bfReserved1=bfh.bfReserved2=0; <DiOWi  
 bfh.bfType=((WORD)('M'<< 8)|'B'); . 5hp0L}  
 bfh.bfSize=54+size; 0-e  
 bfh.bfOffBits=54; 8cr NOZS6  
 CFile bf; xl!K;Y2<  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ A]y*so!)>  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ;( K MGir  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); WVL#s?=g  
  bf.WriteHuge(lpData,size); J 3?Dj  
  bf.Close(); hH4o;0rqJ  
  nCount++; Sni=gZK  
 } 6mG3fMih.  
 GlobalFreePtr(lpData); 71iRG*O  
 if(nCount==1) @&R1wr1>I5  
  m_Number.Format("%d picture captured.",nCount); ILG?r9 x  
 else m4**>!I  
  m_Number.Format("%d pictures captured.",nCount); O2#S: ~h  
  UpdateData(FALSE); D zDj)7  
} 1$["79k  
_`aR_ %Gx  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5d 5t9+t  
{ =:5<{J OG  
 if(pMsg -> message == WM_KEYDOWN) a&5g!;.  
 { Va9q`XbyO  
  if(pMsg -> wParam == VK_ESCAPE) V<0$xV1b|=  
   return TRUE; d(l|hmj4j9  
  if(pMsg -> wParam == VK_RETURN) i:Mc(mW  
   return TRUE; l BiovT  
 } I6w/0,azC  
 return CDialog::PreTranslateMessage(pMsg); 1i,4".h?M  
} wu^q`!ml  
fA XE~  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) [@.B4p  
{ k:0P+d  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ %]jQ48^R  
  SaveBmp(); BMjfqX  
  return FALSE; i:k-"  
} >(tO QeN  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ o>u!CL<  
 CMenu pop; IA4+ad'\E  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); =J.EH|  
 CMenu*pMenu=pop.GetSubMenu(0); 8t``NZ[  
 pMenu->SetDefaultItem(ID_EXITICON); %|?1B$s0  
 CPoint pt; !GNXt4D  
 GetCursorPos(&pt); ,P{ HE8.  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); v72,h  
 if(id==ID_EXITICON) ?'+8[OHiF^  
  DeleteIcon(); FW^.m?}|  
 else if(id==ID_EXIT) C={mi#G[/  
  OnCancel(); @.o@-3k  
 return FALSE; +u#Sl)F  
} hO;9Y|y  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); `@\^m_!}  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {,v: GMsm  
 AddIcon(); C9Wojo.  
 return res; @W)/\AZ3  
} OX)BP.h#  
"yri[X  
void CCaptureDlg::AddIcon() 2fBYT4*P;  
{ 9Z9l:}bO  
 NOTIFYICONDATA data; .\4l'THn,0  
 data.cbSize=sizeof(NOTIFYICONDATA); K{FhT9R'  
 CString tip; Y UZKle  
 tip.LoadString(IDS_ICONTIP); Qdm(q:w  
 data.hIcon=GetIcon(0); G1r V<,#m  
 data.hWnd=GetSafeHwnd(); [D9:A  
 strcpy(data.szTip,tip); "i''Ui\H  
 data.uCallbackMessage=IDM_SHELL; 2lJZw@  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; {kG;."S+K  
 data.uID=98; x~(y "^ph  
 Shell_NotifyIcon(NIM_ADD,&data); jNqVdP]d\  
 ShowWindow(SW_HIDE); J(hA^;8:  
 bTray=TRUE; dqwWfn1lt  
} <[5#c*A  
u2,H ]-  
void CCaptureDlg::DeleteIcon() E@]sq A  
{ ]W|RtdF3.N  
 NOTIFYICONDATA data; TPqvp|~2  
 data.cbSize=sizeof(NOTIFYICONDATA); s?+fPOF  
 data.hWnd=GetSafeHwnd(); f@*>P_t  
 data.uID=98; u7 ~mn l  
 Shell_NotifyIcon(NIM_DELETE,&data); cP('@K=p  
 ShowWindow(SW_SHOW); Wa}"SqYr h  
 SetForegroundWindow(); :5<#X8>d  
 ShowWindow(SW_SHOWNORMAL); .J:;_4x  
 bTray=FALSE; $$~a=q,P[  
} UC;=)  
-PXoMZx%  
void CCaptureDlg::OnChange() 7A[Ogro  
{ jRwa0Px(  
 RegisterHotkey(); mOSCkp{<e  
}  mc~`  
s/PhXf\MN  
BOOL CCaptureDlg::RegisterHotkey() 1::LN(`<  
{ K /8qB~J*  
 UpdateData(); J2=*-O:  
 UCHAR mask=0; }2mI*"%)\u  
 UCHAR key=0; GM77Z.Y  
 if(m_bControl) Q.>/*8R;  
  mask|=4; 5d(qtFH1  
 if(m_bAlt) ^Bn1;  
  mask|=2; =lm nzu<  
 if(m_bShift) @Z"?^2  
  mask|=1; iU,/!IQ  
  key=Key_Table[m_Key.GetCurSel()]; "bi  !=  
 if(bRegistered){ 8}9Ob~on  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Djyp3uUA/  
  bRegistered=FALSE; J[MVE4&  
 } :=Nb=&lst  
 cMask=mask; uh1S 7!^  
 cKey=key; a6P!Wzb  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); [}@n*D$  
 return bRegistered; 7NeDs$  
} cL ae=N  
BZ}`4W'  
  四、小结 %-k(&T3&  
O68bzi]  
  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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