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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: 3a'Rs{qxn  
  6vD]@AF  
  一、实现方法 F&W0DaH  
(SgEt  
  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: dWzDSlP&  
e67c:Z  
#pragma data_seg("shareddata") 2*~JMbm  
HHOOK hHook =NULL; //钩子句柄 QLn5#x~xb  
UINT nHookCount =0; //挂接的程序数目 9%p7B~}E  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 J8sJ~FnUj  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 SQO>}#qm  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey !SLP8|Cd  
static int KeyCount =0; 2ru*#Z#(  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ^%K1R;  
#pragma data_seg() [?|l X$<  
<3SFP3^:  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 G"T;l"TAt8  
A&NC0K}G!  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: p`E|SNt/W  
:wv :#EaH  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR _Ewy^;S%L  
cKey,UCHAR cMask) )1ZJ  
{ nhVK?  
 BOOL bAdded=FALSE; Ct =E;v7}  
 for(int index=0;index<MAX_KEY;index++){ *([0"  
  if(hCallWnd[index]==0){ Sa h<sb=  
   hCallWnd[index]=hWnd; x*loACee.  
   HotKey[index]=cKey; ;w>3,ub(0  
   HotKeyMask[index]=cMask; t7C!}'g&'  
   bAdded=TRUE; eeI9[lTw  
   KeyCount++; U(S@1i(  
   break; _g^K$+F'}  
  } 2-"Lxe65f  
 } $4$?M[  
 return bAdded; qHC*$v#.V?  
} <eud#v  
//删除热键 I&'S2=s  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) t?%}hs\!  
{ WL)_8!  
 BOOL bRemoved=FALSE; :w {M6mM>  
 for(int index=0;index<MAX_KEY;index++){ {Gk}3u/  
  if(hCallWnd[index]==hWnd){ 8r`VbgI&  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ J]=aI>Ow  
    hCallWnd[index]=NULL; eu}:Wg2  
    HotKey[index]=0; +s+PnZ%0V  
    HotKeyMask[index]=0; y0&V$uv/  
    bRemoved=TRUE; JL]k:i^`A  
    KeyCount--; ^V XXq  
    break; y:i[~y  
   } 6?<`wGs(  
  } ?v)"%.  
 } o3TBRn,  
 return bRemoved; $dVgFot  
} /_zF?5h  
=CG!"&T  
*mK);@pL  
  DLL中的钩子函数如下: cOZajC<G  
\DcC1W  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?VOs:sln  
{ 35@Ibe~  
 BOOL bProcessed=FALSE; `3>)BV<P  
 if(HC_ACTION==nCode) @0/@p"j  
 { g`~lIt [=  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 H z < M  
   switch(wParam) eLt Cxe  
   {  <4!&iU+;  
    case VK_MENU: soQv?4  
     MaskBits&=~ALTBIT; F"@'(b  
     break; -%/,j)VKD  
    case VK_CONTROL: y?R <g^A  
     MaskBits&=~CTRLBIT; 66"ZH,335  
     break;  1+i  
    case VK_SHIFT: ++p& x{  
     MaskBits&=~SHIFTBIT; QLpTz"H  
     break; ("P mB?20  
    default: //judge the key and send message Bu >yRL=*  
     break; vS*0CR\  
   } ["#A-S  
   for(int index=0;index<MAX_KEY;index++){ Med"dHo7  
    if(hCallWnd[index]==NULL) 2h? r![  
     continue; <,]CVo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) g!kRa.`u1  
    { {</$ObK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); kAQ\t?`x  
     bProcessed=TRUE; $qyM X[  
    } nO.+&kA  
   } &<#BsFz  
  } .pu`\BW>  
  else if((lParam&0xc000ffff)==1){ //有键按下 '`goy%Wd  
   switch(wParam) @Qsg.9N3K  
   { B43#9CK`o  
    case VK_MENU: A'AWuj\r2R  
     MaskBits|=ALTBIT; RVKaqJ0e<  
     break; r;6YCI=z  
    case VK_CONTROL: JU%yqXO  
     MaskBits|=CTRLBIT; _~#C $-T  
     break; Nxs%~ wZ   
    case VK_SHIFT: Z FrXw+  
     MaskBits|=SHIFTBIT; wM&x8 <  
     break; L!8?2 \5  
    default: //judge the key and send message [\M?8R$)  
     break; {j=hQL3  
   } uu/7Ie  
   for(int index=0;index<MAX_KEY;index++){ 2mp>Mn~K^  
    if(hCallWnd[index]==NULL) Zz*mf+  
     continue; hG3$ ]i9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) md +`#-D\O  
    { @U.}Ei  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Qs[EA_  
     bProcessed=TRUE;  9DAwC:<r  
    } ,'{B+CHoS  
   } mE@o27  
  } %>:)4A  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 2F@<{v4  
   for(int index=0;index<MAX_KEY;index++){ 6o23#JgN  
    if(hCallWnd[index]==NULL) Ecl7=-y  
     continue; }~,cCtg:o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #w?%&,Kp  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); pO+wJ|f  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 <EN[s  
   } ZZJ"Ny.2  
  } ej53O/hP  
 } *8eh%3_$h  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); r|BKp,u9  
} gY^TBR0?m  
q'-l; V|  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: _~&v s<  
>oYwzK0&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); WjxBNk'f  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7n/I'r  
|N.q[>^R  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: zYJ`.,#C 5  
) G&3V  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) A/6nV n  
{ EGO@`<"h  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) uXa}<=O  
 { bGnJ4R3J  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ! r\ktX  
  SaveBmp(); h0QQP  
  return FALSE; \>k#]4@rp  
 } F?Nk:# V  
 …… //其它处理及默认处理 (?wKBUi  
} GB Un" _J  
l_IX+4(@b|  
[<Puh  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 32'9Ch.  
S(s~4(o>8  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Lh$ac-Ct  
+/8?+1E ^  
  二、编程步骤 $)a5;--W  
Z4sjH1W  
  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"; uT2cHzqKB  
oK[,xqyA  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; $\H46Ji  
#Jb$AA! z  
  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; 0$uS)J\;K  
2Rt ZTn  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; h"m7r4f  
N=x,96CF  
  5、 添加代码,编译运行程序。 ]c+'SJQ  
Kwau:_B  
三、程序代码 *xKR;?.  
0']M,iC/  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL I9aber1  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) j KK48S  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Y^f|}YO%y  
#if _MSC_VER > 1000 `buTP?]4.  
#pragma once >rGlj  
#endif // _MSC_VER > 1000 v:b%G?o  
#ifndef __AFXWIN_H__ 0$ EJ4  
#error include 'stdafx.h' before including this file for PCH OQyOv%g5C  
#endif <VPtbM@(m  
#include "resource.h" // main symbols =^}2 /vA  
class CHookApp : public CWinApp t?Znil|o  
{ /iy/2x28>  
 public: W5 }zJ)x  
  CHookApp(); IHfqW?  
  // Overrides Ha\hQ'99  
  // ClassWizard generated virtual function overrides A O]e^Q  
  //{{AFX_VIRTUAL(CHookApp) yK;I<8+>_  
 public: i[ lH@fJm_  
  virtual BOOL InitInstance(); Su~`jRN $  
  virtual int ExitInstance(); ,;}RIcvQV  
  //}}AFX_VIRTUAL  _^ZII  
  //{{AFX_MSG(CHookApp) nwYeOa/t  
  // NOTE - the ClassWizard will add and remove member functions here. F!'"mU<f  
  // DO NOT EDIT what you see in these blocks of generated code ! ==9Ez  
  //}}AFX_MSG Pd?YS!+S  
  DECLARE_MESSAGE_MAP() 7Q&P4{hi0  
}; qKXn=J/0tA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); t@v8>J%K  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,'}ZcN2)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p-_j0zv  
BOOL InitHotkey(); ] a()siT  
BOOL UnInit(); yDrJn* r^  
#endif _L ].n)b  
oj,  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. |ipppE=  
#include "stdafx.h" WJWrLu92\U  
#include "hook.h" +iR ;D$w  
#include <windowsx.h> *BV .zbGm  
#ifdef _DEBUG ?T"crX  
#define new DEBUG_NEW muLTYgaM  
#undef THIS_FILE TfOZ>uR"g  
static char THIS_FILE[] = __FILE__; 4+0Zj+ q";  
#endif rXMv&]Ag  
#define MAX_KEY 100 :0l(Ll KD  
#define CTRLBIT 0x04 1*"Uc!7.%  
#define ALTBIT 0x02 iJK9-k~  
#define SHIFTBIT 0x01 Ra5cfkH;  
#pragma data_seg("shareddata") 6r`g+Js/  
HHOOK hHook =NULL; +y2*[  
UINT nHookCount =0; 4C$,X!kzF  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey i8]r }a  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT S;C3R5*:  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey pJI H_H  
static int KeyCount =0; ! ^W|;bq  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift FWj~bn  
#pragma data_seg() 3y!CkJKv  
HINSTANCE hins; Ptg73Gm&R  
void VerifyWindow(); d0,I] "  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) BdTj0{S1u  
//{{AFX_MSG_MAP(CHookApp) #'[ f^xgJ  
// NOTE - the ClassWizard will add and remove mapping macros here. 7hc(]8eP  
// DO NOT EDIT what you see in these blocks of generated code! />?d 2?  
//}}AFX_MSG_MAP 2+'&||h  
END_MESSAGE_MAP() DI\^ +P  
W$&Q.Z  
CHookApp::CHookApp() 6\bbP>ql  
{ fAK  
 // TODO: add construction code here, al2v1.Y}  
 // Place all significant initialization in InitInstance W{`;][  
} @1pdyKK  
{"<Q?yA2y  
CHookApp theApp; :p{iBDA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )gR&Ms4  
{ &45.*l|mo  
 BOOL bProcessed=FALSE; * PZ=$>r  
 if(HC_ACTION==nCode) Av'H(qB\K  
 { |(/"IS]  
  if((lParam&0xc0000000)==0xc0000000){// Key up |^=`ln!  
   switch(wParam) %l,Xt"nS#  
   { QM IQy  
    case VK_MENU: )z aMycW  
     MaskBits&=~ALTBIT; 3K'3Xp@A  
     break; cc>h=%s`  
    case VK_CONTROL: k`?n("j  
     MaskBits&=~CTRLBIT; E?;W@MJi  
     break; r"n)I$  
    case VK_SHIFT: H=dj\Br`  
     MaskBits&=~SHIFTBIT; aoBM _#  
     break; Nb$)YMbA  
    default: //judge the key and send message N9i>81tY  
     break; 1q*3V8  
   } Lpn`HAw&  
   for(int index=0;index<MAX_KEY;index++){ f_ ::?  
    if(hCallWnd[index]==NULL) F2u{Wzr_@  
     continue; 2@ad! h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w<'mV^S  
    { y.>r>o"0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); W6)A":`  
     bProcessed=TRUE; |OC6yN *P)  
    } IE|$>q0Z  
   } }NUP[%  
  } rR7}SEa  
  else if((lParam&0xc000ffff)==1){ //Key down !6kLg1  
   switch(wParam) vX{]_  
   { iQA f  
    case VK_MENU: 2nw P-i  
     MaskBits|=ALTBIT; K(_nfE{  
     break; 9@!`,Co  
    case VK_CONTROL: V8c&2rNa  
     MaskBits|=CTRLBIT; Q4UaqiL  
     break; !7_Q_h',  
    case VK_SHIFT: ?&N JN/+%  
     MaskBits|=SHIFTBIT; nY6^DE2f  
     break; En[cg  
    default: //judge the key and send message ATwPfo8jx@  
     break; 7VR+EV  
   } ,3x3&c  
   for(int index=0;index<MAX_KEY;index++) "6.kZ$`%  
   { D].1X0^hp  
    if(hCallWnd[index]==NULL) /Wt<[g#  
     continue; HogT#BMs  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;Lz96R@}  
    { h_H$+!Nzb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); "/wZtc  
     bProcessed=TRUE; v\&Wb_;A  
    } JEj.D=@[  
   } z`'{l {  
  } $+-2/=>Xk  
  if(!bProcessed){ rIy,gZr.U  
   for(int index=0;index<MAX_KEY;index++){ *_@8v?  
    if(hCallWnd[index]==NULL) ?oP<sGp  
     continue; FL- sXg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) G 9d@vu  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); iE>T5XV8$B  
   } `Fnt#F}  
  } iku) otUc  
 } 6/ F]ncwG  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); F~4oPB K<  
} O\8_;Gc;  
6f(K'v  
BOOL InitHotkey() EN'}+E 8  
{ HvLvSy1U  
 if(hHook!=NULL){ Ar,B7-F!  
  nHookCount++; .gzNdSE  
  return TRUE; {L4ta~2/T  
 } :[A>O(  
 else 9Eu.Y  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 1#/>[B  
  if(hHook!=NULL) rzsAnLxo  
   nHookCount++; rI23e[  
  return (hHook!=NULL); 5R"iF+p4  
} <xv@us7  
BOOL UnInit() iK%%  
{ ^`?2g[AA  
 if(nHookCount>1){ -C1,$mkj  
  nHookCount--; ?H3Ls~R  
  return TRUE; \jH^OXxb  
 } {$5?[KD  
 BOOL unhooked = UnhookWindowsHookEx(hHook); qp;eBa  
 if(unhooked==TRUE){ .W>LEz'  
  nHookCount=0; MROe"Xj  
  hHook=NULL; 2SVBuV/R  
 } Vz[tgb]-  
 return unhooked; mqUn3F3  
} M^S <G  
h0ml#A`h  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) s_:7dD  
{ \2]M &n GT  
 BOOL bAdded=FALSE; $S Kax#[  
 for(int index=0;index<MAX_KEY;index++){ p$.m=+K~  
  if(hCallWnd[index]==0){ ]l/ PyX  
   hCallWnd[index]=hWnd; u2\QhP 9  
   HotKey[index]=cKey; hc#Sy:T>  
   HotKeyMask[index]=cMask; -9)H [}.  
   bAdded=TRUE; C ^QpVt-T  
   KeyCount++; *,az`U  
   break; csK;GSp}  
  } EnW}>XN  
 } f(SK[+aqW  
 return bAdded; d0U-:S-  
} eICavp  
rD_\NgVAs  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |[./jg"  
{ mZ_643|  
 BOOL bRemoved=FALSE; 9^+8b9y  
 for(int index=0;index<MAX_KEY;index++){ v0q(k;Ya  
  if(hCallWnd[index]==hWnd){ >8;EeRvI  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ hlKM4JT\  
    hCallWnd[index]=NULL; 1RHFWK5Si  
    HotKey[index]=0; .30eO_msK  
    HotKeyMask[index]=0; M1HGXdN*B  
    bRemoved=TRUE; nY M2Vxi0+  
    KeyCount--; 2pQ29  
    break; A  r,fmq  
   } ks19e>'5Q  
  } @h=r;N#/`P  
 } XU5GmGu_+  
 return bRemoved; nI_UL  
} 2e?a"Vss  
jCp^CNbA  
void VerifyWindow() $Cnv]1%  
{ ,II-:&H  
 for(int i=0;i<MAX_KEY;i++){ a1dkB"Zp.p  
  if(hCallWnd!=NULL){ EBMZ7b-7  
   if(!IsWindow(hCallWnd)){ .o(S60iH!(  
    hCallWnd=NULL; 2'U+QK@  
    HotKey=0; T/$hN hQK  
    HotKeyMask=0; L)"E_  
    KeyCount--; wNm1H[{  
   } XMlcY;W  
  } S; Fj9\2)I  
 } ?s]+2Tq  
} >Q#\X=a>  
@:w[(K[^b/  
BOOL CHookApp::InitInstance() FR^(1+lx&  
{ ~0V,B1a  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); #-7w |  
 hins=AfxGetInstanceHandle(); HDQH7Bs  
 InitHotkey(); ItxC}qT  
 return CWinApp::InitInstance(); g9G 8;  
} $:IEpV{  
D` abVf  
int CHookApp::ExitInstance() (5h+b_eB  
{ kWZ/O  
 VerifyWindow();  % Z-B{I(  
 UnInit(); p<8Ga.kiN  
 return CWinApp::ExitInstance(); 9jf2b  
} QHPC?a6CD  
Dssecc'  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file bM>5=Zox  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) dkAY%ztwo  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ glUf. :]  
#if _MSC_VER > 1000 Sp\ 7  
#pragma once ->*'Y;t4  
#endif // _MSC_VER > 1000 ss'`[QhR2  
}0 b[/ZwQ  
class CCaptureDlg : public CDialog I%tJLdL  
{ -+Gd<U$  
 // Construction hZ~ \Z S7  
 public: "zx4k8  
  BOOL bTray; vN$j @h .  
  BOOL bRegistered; ByivV2qd{  
  BOOL RegisterHotkey(); K!qV82b='{  
  UCHAR cKey; L9^h .Y7  
  UCHAR cMask; p -wEPC0  
  void DeleteIcon(); |YWX.-aeo  
  void AddIcon(); =x-@-\m  
  UINT nCount; XHYVcwmDz-  
  void SaveBmp(); ~O~R,h>  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor &\ \)x.!  
  // Dialog Data _28vf Bl?  
  //{{AFX_DATA(CCaptureDlg) G21cJi*  
  enum { IDD = IDD_CAPTURE_DIALOG }; a9niXy}a(  
  CComboBox m_Key; hM~zO1XW  
  BOOL m_bControl; _su$]s  
  BOOL m_bAlt; Y4,LXuQ  
  BOOL m_bShift; 99u9L)  
  CString m_Path; xy Pz_9  
  CString m_Number; E;Q ,{{#  
  //}}AFX_DATA ctT6va  
  // ClassWizard generated virtual function overrides 5|Hz$oU  
  //{{AFX_VIRTUAL(CCaptureDlg) f) @-X!  
 public: 5~E'21hJ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 6R';[um?q  
 protected: @ !m+s~~]h  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support m+'vrxTY  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); d,*#yzO  
  //}}AFX_VIRTUAL /qObXI  
  // Implementation JVt(!%K}&  
 protected: >Qold7 M  
  HICON m_hIcon; L>{p>  
  // Generated message map functions -Gn0TA2/C  
  //{{AFX_MSG(CCaptureDlg) ~E*`+kD  
  virtual BOOL OnInitDialog(); i2Cw#x0s  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); E'wJ+X9 +  
  afx_msg void OnPaint(); 0MX``/Z72  
  afx_msg HCURSOR OnQueryDragIcon(); ' Y cVFi  
  virtual void OnCancel(); 1k?k{Ri  
  afx_msg void OnAbout(); eZk4 $y  
  afx_msg void OnBrowse(); 3lT>C'qq  
  afx_msg void OnChange(); F2Nb]f  
 //}}AFX_MSG {v~.zRW%]r  
 DECLARE_MESSAGE_MAP() @WfX{485  
}; ?R8wmE[w  
#endif 1:VbbOu->V  
9>1Gj-S2:  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 3gNVnmZG  
#include "stdafx.h" uSU[Y,'x  
#include "Capture.h" /R!/)sg  
#include "CaptureDlg.h" ~.L\f%<  
#include <windowsx.h> UqEpeLK  
#pragma comment(lib,"hook.lib") F3pBk)>a\  
#ifdef _DEBUG - }2AXP2q  
#define new DEBUG_NEW f_qW+fN::s  
#undef THIS_FILE ^oT!%"\  
static char THIS_FILE[] = __FILE__; eh5j  
#endif %YbcI|i]<0  
#define IDM_SHELL WM_USER+1  mZ^ev;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); e SlZAdK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qmWn$,ax  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Mpu8/i gX,  
class CAboutDlg : public CDialog w] =q>p  
{ rj> _L  
 public: Vp~c$y+  
  CAboutDlg(); ?OFl9%\ V  
  // Dialog Data ERQc1G]3Dd  
  //{{AFX_DATA(CAboutDlg) 0}d^UGD  
  enum { IDD = IDD_ABOUTBOX }; ]31UA>/TI  
  //}}AFX_DATA hEv}g  
  // ClassWizard generated virtual function overrides 1?j[ '~aE  
  //{{AFX_VIRTUAL(CAboutDlg) ^qP}/H[QT  
 protected: jt?.g'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support gvl3NQQ%t  
  //}}AFX_VIRTUAL MzudCMF  
  // Implementation a][QY1E@?  
 protected: 1*o=I-nOa  
  //{{AFX_MSG(CAboutDlg) CW9vC  
  //}}AFX_MSG d?Y|w3lB  
  DECLARE_MESSAGE_MAP() {Z^  G]@  
}; ]1k"'XG4,  
MR{JMo=r  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) TC$)::C1  
{ p,'Z{7HG  
 //{{AFX_DATA_INIT(CAboutDlg) ejjL>'G/|%  
 //}}AFX_DATA_INIT zXRq) ;s  
} swGp{wJ  
 o<Z  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) d$}z,~sN  
{ ^}PG*h|  
 CDialog::DoDataExchange(pDX); THl={,Rw`  
 //{{AFX_DATA_MAP(CAboutDlg) ?0%3~E`l:  
 //}}AFX_DATA_MAP &?)? w-$p  
}  <RaM@E  
7yM"G$  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) C ks;f6G  
 //{{AFX_MSG_MAP(CAboutDlg) -)Zp"  
 // No message handlers 6 J B"qd  
 //}}AFX_MSG_MAP k/;%{@G)  
END_MESSAGE_MAP() 'Jl |-RUd  
>nqCUhS   
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) :kb2v1{\  
: CDialog(CCaptureDlg::IDD, pParent) 9N@m><N84  
{ 2f8\Osn>m  
 //{{AFX_DATA_INIT(CCaptureDlg) kQt#^pO)  
  m_bControl = FALSE; Am @o}EC  
  m_bAlt = FALSE; L)qDtXd4  
  m_bShift = FALSE;  'K7m!y  
  m_Path = _T("c:\\"); ;if PqL kO  
  m_Number = _T("0 picture captured."); \a7caT{  
  nCount=0; BGOajYD  
  bRegistered=FALSE; LjEG1$F>  
  bTray=FALSE; hzcSKRm  
 //}}AFX_DATA_INIT |mp~d<&  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 9(AY7]6  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); !-cK@>.pE  
} )kpNg:2p  
5"WI^"6b:  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) qvs&*lBY  
{ ARd*c?Om  
 CDialog::DoDataExchange(pDX); fuQk}OW{  
 //{{AFX_DATA_MAP(CCaptureDlg) L4t( Y7  
  DDX_Control(pDX, IDC_KEY, m_Key); &rbkw<=j  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); o^8Z cN>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 5>!I6[{  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); -%)S~ R  
  DDX_Text(pDX, IDC_PATH, m_Path); [fZhfZ)<  
  DDX_Text(pDX, IDC_NUMBER, m_Number); #Y%(CI  
 //}}AFX_DATA_MAP ]]eI80u[  
} Is[n7Q  
4L_AhX7  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) "~:P-]`G  
//{{AFX_MSG_MAP(CCaptureDlg) 'Y22HVUX  
 ON_WM_SYSCOMMAND() 8I]rC<O6:  
 ON_WM_PAINT() $g&_7SJ@  
 ON_WM_QUERYDRAGICON() Q>g-xe 1  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 9 K~X+N\  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 's\rQ-TV  
 ON_BN_CLICKED(ID_CHANGE, OnChange) E|"QYsi.Ck  
//}}AFX_MSG_MAP .Mxt F\  
END_MESSAGE_MAP() a^eR~efdu@  
ufB9\yl{~  
BOOL CCaptureDlg::OnInitDialog() J;S Z"I'  
{ 5h [<!f=  
 CDialog::OnInitDialog(); U&o ~U] rm  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); `1i\8s&O6@  
 ASSERT(IDM_ABOUTBOX < 0xF000); b>@fHmpwD  
 CMenu* pSysMenu = GetSystemMenu(FALSE); nU23D@l  
 if (pSysMenu != NULL) C {G647  
 { 4&<zkAMR  
  CString strAboutMenu; 7? ]wAH89  
  strAboutMenu.LoadString(IDS_ABOUTBOX); X&gXhr#dL\  
  if (!strAboutMenu.IsEmpty()) [H=l# W@  
  { nn8uFISb  
   pSysMenu->AppendMenu(MF_SEPARATOR); 1Gw_S?$7  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); YDaGr6y4i  
  } Q94p*]W"  
 } F#Bi*YY  
 SetIcon(m_hIcon, TRUE); // Set big icon A"wso[{  
 SetIcon(m_hIcon, FALSE); // Set small icon `^: v+!  
 m_Key.SetCurSel(0); %:.IG.`d  
 RegisterHotkey(); kf1 (  
 CMenu* pMenu=GetSystemMenu(FALSE); ch)#NHZ9F  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "Xj>dB1~  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Q5c13g2(c  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); @5\/L6SRfL  
 return TRUE; // return TRUE unless you set the focus to a control 7 aN}l QM  
} I@uin|X  
BFPy~5W  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) )%bY2 pk  
{ +K61-Div  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) @O| l A  
 { /H$/s=YU\U  
  CAboutDlg dlgAbout; 2l}3L  
  dlgAbout.DoModal(); 5[A4K%EL  
 } |$`I1  
 else T;pe7"  
 { +.|8W!h`1  
  CDialog::OnSysCommand(nID, lParam); lt|UehJ F  
 } ePY69!pO5e  
} ol@LLT_m  
TN.&FDqC9  
void CCaptureDlg::OnPaint() RQW<Sp~  
{ |\/V1  
 if (IsIconic()) O^4K o}  
 { AjMx\'(C  
  CPaintDC dc(this); // device context for painting bEl)/z*gy/  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); q6zKyOE  
  // Center icon in client rectangle h9j/mUwV  
  int cxIcon = GetSystemMetrics(SM_CXICON); "uD^1'IW2  
  int cyIcon = GetSystemMetrics(SM_CYICON); z/t+t_y  
  CRect rect; ym6gj#2m  
  GetClientRect(&rect); uDG#L6  
  int x = (rect.Width() - cxIcon + 1) / 2; wIK&EGQ  
  int y = (rect.Height() - cyIcon + 1) / 2; [ FNA:  
  // Draw the icon B#K2?Et!t  
  dc.DrawIcon(x, y, m_hIcon); Y 9~z7  
 } 84YZT+TEN  
 else Cs8e("w  
 { Oxr?y8C~  
  CDialog::OnPaint(); ~ H $q  
 } ntEf-x<  
} 4&^BcWqA*f  
(ZHEPN  
HCURSOR CCaptureDlg::OnQueryDragIcon() IQQWp@w#8  
{ VD-2{em  
 return (HCURSOR) m_hIcon; ^FN(wvqb8  
} VU 8 ~hF  
t"]~e"  
void CCaptureDlg::OnCancel() A+bU{oLr  
{ -<.b3Mh  
 if(bTray) ]BBL=$*  
  DeleteIcon(); gTwxmp.,  
  CDialog::OnCancel(); aC=D_JJ\  
} 4^Ghn  
PK|"+I0  
void CCaptureDlg::OnAbout() >s+*D=k  
{ 63n<4VSH  
 CAboutDlg dlg; q+Cq&|4 ?2  
 dlg.DoModal(); and)>$)|  
} sZ9VXnz24  
&o$Pwk\p/  
void CCaptureDlg::OnBrowse() &?gvW//L2  
{ vZl]C%  
 CString str; \,5OPSB  
 BROWSEINFO bi; JM-+p  
 char name[MAX_PATH]; mh=YrDU+L  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 1y($h<  
 bi.hwndOwner=GetSafeHwnd(); !*@sX7H  
 bi.pszDisplayName=name; wio}<Y6Xz  
 bi.lpszTitle="Select folder"; d~U}IMj  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; hbg:}R=B<  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~t-!{F  
 if(idl==NULL) Wy`ve~y  
  return; EFNi# D8s  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH));  N\9 Wxz$  
 str.ReleaseBuffer(); pZg}7F{$  
 m_Path=str; c;dMXv   
 if(str.GetAt(str.GetLength()-1)!='\\') }hy, }2(8  
  m_Path+="\\"; +__PT4ps  
 UpdateData(FALSE); oX #WT  
} o6[aP[~F  
M'D l_dx-  
void CCaptureDlg::SaveBmp() zZax![Z  
{ n$oHr  
 CDC dc; ~l@ h  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); L d;))e  
 CBitmap bm; jJK`+J,i}X  
 int Width=GetSystemMetrics(SM_CXSCREEN); M)JKe!0ad1  
 int Height=GetSystemMetrics(SM_CYSCREEN); ]'iOV-2^'  
 bm.CreateCompatibleBitmap(&dc,Width,Height); iir]M`A.-  
 CDC tdc; GZwz4=`  
 tdc.CreateCompatibleDC(&dc); rV0X*[]J>  
 CBitmap*pOld=tdc.SelectObject(&bm); ,p\:Z3{ZH  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 7(S66  
 tdc.SelectObject(pOld); _vV3A3|Ec,  
 BITMAP btm; ;"K;D@xzh]  
 bm.GetBitmap(&btm); V6ICR{y<3  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 0mMoDJRy  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); {%b*4x0?  
 BITMAPINFOHEADER bih; cfP9b8JG  
 bih.biBitCount=btm.bmBitsPixel; miTySY6 ^  
 bih.biClrImportant=0; Sbp].3^j  
 bih.biClrUsed=0; f~0CpB*X  
 bih.biCompression=0; qLYz-P'ik  
 bih.biHeight=btm.bmHeight; n,_q6/!  
 bih.biPlanes=1; 9z$fDs}.q  
 bih.biSize=sizeof(BITMAPINFOHEADER); 5Y(<T~  
 bih.biSizeImage=size; 45aUz@  
 bih.biWidth=btm.bmWidth; b?kY`LC  
 bih.biXPelsPerMeter=0; * ",/7(  
 bih.biYPelsPerMeter=0; };Oyv7D+b  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); +>}LT_  
 static int filecount=0; Nm7YH@x*o  
 CString name; @?vC4+'  
 name.Format("pict%04d.bmp",filecount++); 3HEm-pok  
 name=m_Path+name; [(rT,31cW  
 BITMAPFILEHEADER bfh; 2t,N9@u=UN  
 bfh.bfReserved1=bfh.bfReserved2=0; /f}!G  
 bfh.bfType=((WORD)('M'<< 8)|'B'); bpx ^  
 bfh.bfSize=54+size; "\k| Z  
 bfh.bfOffBits=54; YLsOA`5X  
 CFile bf; Oo0SDWI`(  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 4'wbtE|  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 'w z6Zt  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); tP][o494\&  
  bf.WriteHuge(lpData,size); v8} vk]b  
  bf.Close(); y<g1q"F  
  nCount++; \'Q rJ ?D  
 } , UsY0YC  
 GlobalFreePtr(lpData); g2;lEW  
 if(nCount==1) tiGBjTPt  
  m_Number.Format("%d picture captured.",nCount); T!7B0_  
 else AxtmG\o>  
  m_Number.Format("%d pictures captured.",nCount); f OasX!=  
  UpdateData(FALSE); 3Cw}y55_y  
} g&*,j+$ }  
0,/I2!dF?  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) y1)ZO_'  
{ k5%W8dI  
 if(pMsg -> message == WM_KEYDOWN) V1&qgAy~  
 { oo\7\b#Jx  
  if(pMsg -> wParam == VK_ESCAPE) ^B)f!HtU  
   return TRUE; I`f5)iF?0  
  if(pMsg -> wParam == VK_RETURN) Z%Fc -KVt  
   return TRUE; GXp`yK9c  
 } W#P`Y< u$  
 return CDialog::PreTranslateMessage(pMsg); PU,%Y_xR  
} Mbp7%^E"A  
Y b=77(Q V  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) M#_|WL~  
{ 'u:-~nSX)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ g<N;31:c\  
  SaveBmp(); q6,z 1A"  
  return FALSE; D 5bPF~q  
} ^TtL-|I  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ]"&](e6*  
 CMenu pop; !:PiQ19 'u  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !Ii[`H  
 CMenu*pMenu=pop.GetSubMenu(0); wRvh/{xB  
 pMenu->SetDefaultItem(ID_EXITICON); Gp{,v  
 CPoint pt; Cz)&R^  
 GetCursorPos(&pt); 6O <UW.  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); kO5lLqE  
 if(id==ID_EXITICON) W=#AfPi$&  
  DeleteIcon(); * bd3^mP  
 else if(id==ID_EXIT) En:>c  
  OnCancel(); Sbl=U  
 return FALSE; =?c""~7  
} V)5K/ U{  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); d:k n%L6k_  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) o@BV&|  
 AddIcon(); ~nTj't2R  
 return res; *s,[Uy![  
} W#%s0EN<_  
_6Y+E"@zs  
void CCaptureDlg::AddIcon() z&WtPSyGj  
{ AN:yL a!  
 NOTIFYICONDATA data; 7o0zny3?  
 data.cbSize=sizeof(NOTIFYICONDATA); \ )=WA!  
 CString tip; @)BO`;*$fF  
 tip.LoadString(IDS_ICONTIP); 43pe6 ^.  
 data.hIcon=GetIcon(0); *5 +GJWKN  
 data.hWnd=GetSafeHwnd(); F#>00b{Q  
 strcpy(data.szTip,tip); (-g*U#   
 data.uCallbackMessage=IDM_SHELL; <n4` #d  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; (c>g7d<>n  
 data.uID=98; f-G)pHm  
 Shell_NotifyIcon(NIM_ADD,&data); fz\Q>u'T  
 ShowWindow(SW_HIDE); s(nT7x+W  
 bTray=TRUE; wS);KLe3  
} ujRXAN@mC  
!( rAI  
void CCaptureDlg::DeleteIcon() UWF \Vx*)b  
{ 4/Y?eUQ  
 NOTIFYICONDATA data; Y@`uBB[  
 data.cbSize=sizeof(NOTIFYICONDATA); ?0_<u4  
 data.hWnd=GetSafeHwnd(); cf88Fd6l/  
 data.uID=98; gLB(A\yG  
 Shell_NotifyIcon(NIM_DELETE,&data); X58U>4a  
 ShowWindow(SW_SHOW); b!P,+!<  
 SetForegroundWindow(); 755,=U8'wi  
 ShowWindow(SW_SHOWNORMAL); '< U&8?S  
 bTray=FALSE; 1>OlBp  
} !,$#i  
)A$"COM4  
void CCaptureDlg::OnChange() :YI5O/gsk?  
{ x-m*p^}  
 RegisterHotkey(); kU[hB1D5  
} hO]F\0+  
Qds<j{2  
BOOL CCaptureDlg::RegisterHotkey() /[<F f  
{ F(yR\)!C  
 UpdateData();  px<psR5  
 UCHAR mask=0; UDh \%?j  
 UCHAR key=0; J, -.5  
 if(m_bControl) KClkPL!jP  
  mask|=4; (dq_ ,LI  
 if(m_bAlt) ~t)cbF(UO  
  mask|=2; uQIPnd(V  
 if(m_bShift) u%~'+=  
  mask|=1; Z 2N6r6  
  key=Key_Table[m_Key.GetCurSel()]; 8>9Mh!t}(I  
 if(bRegistered){ ?$|tT\SFV  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Byc;r-Q5V  
  bRegistered=FALSE; QN#"c  
 } 6G2~'zqPc~  
 cMask=mask; dd  
 cKey=key; wa8jr5/k"  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "E\vdhk  
 return bRegistered; ]q1w@)]n}  
} Voo'ZeZa  
Wx:v~/r  
  四、小结 H~Uf2A)C  
SE+hB  
  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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