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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: 7':5  
  ND9 n1WZ&x  
  一、实现方法 u):%5F/  
mC{!8WC@k  
  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: mFgb_Cd  
#K<=xP  
#pragma data_seg("shareddata") uZqu xu.  
HHOOK hHook =NULL; //钩子句柄 qHC*$v#.V?  
UINT nHookCount =0; //挂接的程序数目 ?{@!!te@3v  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 i#@v_^q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 gqO%^b)6  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey vc>^.#7   
static int KeyCount =0; ??$i*  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 BRo R"#'  
#pragma data_seg() IEIxjek  
UZ4tq  
  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。 4 BE:&A  
]zhq.O >2{  
  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: wRV`v$*6  
%mB!|'K%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ;*>QG6Fh  
cKey,UCHAR cMask) ]Vf8mkDGO  
{ ~ X]"P4 u  
 BOOL bAdded=FALSE; o5*74Mv  
 for(int index=0;index<MAX_KEY;index++){ ?vht~5'  
  if(hCallWnd[index]==0){ T(sG.%  
   hCallWnd[index]=hWnd; 1eE]4Z4Q  
   HotKey[index]=cKey; JhMrm%  
   HotKeyMask[index]=cMask; 9AVK_   
   bAdded=TRUE; $.r}g\43P  
   KeyCount++; 7N}\1Di5  
   break; q^jqLT&w  
  } (04j4teE  
 } Ru9pb~K  
 return bAdded; m5'__<  
} 2kp|zX(  
//删除热键 :uT fhr  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ' F 6au[  
{ |04}zU%N  
 BOOL bRemoved=FALSE; C~ }Wo5  
 for(int index=0;index<MAX_KEY;index++){ xdbu|fC  
  if(hCallWnd[index]==hWnd){ -Iruua7b  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ IJ #v"! D  
    hCallWnd[index]=NULL; 5JU(@}Db  
    HotKey[index]=0; X*>o9J45V  
    HotKeyMask[index]=0; <750-d!  
    bRemoved=TRUE; <@x+N%C  
    KeyCount--; RBv=  
    break; $:-= >  
   } #/XK&(X  
  } }'w^<:RSy  
 } R+ #.bQg  
 return bRemoved; @0/@p"j  
} O w($\,  
g1hg`qBBW  
Be14$7r  
  DLL中的钩子函数如下: L3G)?rPFC#  
gk_Xu  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) zM8/ s96h  
{ ?^G$;X7B  
 BOOL bProcessed=FALSE; . f.j >  
 if(HC_ACTION==nCode) ZAnO$pA  
 { S{"6PXzb  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 @|\s$L  
   switch(wParam) -%/,j)VKD  
   {  <-oRhi4  
    case VK_MENU: 9TXm Z  
     MaskBits&=~ALTBIT; cVP49r}}v  
     break; |$|nV^y  
    case VK_CONTROL: *2m&?,nJ  
     MaskBits&=~CTRLBIT; t#D\*:Xi  
     break; %. 6?\w1e  
    case VK_SHIFT: /xrq'|r?C  
     MaskBits&=~SHIFTBIT; /J9T=N  
     break; "` ?W u  
    default: //judge the key and send message t-<[._:+  
     break; vS*0CR\  
   } ! 4^L $  
   for(int index=0;index<MAX_KEY;index++){ +DV6oh  
    if(hCallWnd[index]==NULL) C)3$";$5)  
     continue; h}B# 'e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tpx3:|  
    { <,]CVo  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); |z<wPJ,;2  
     bProcessed=TRUE; c&I,eds  
    } 4iPua"8  
   } z_,]fd=o  
  } ! ,(bXa\^  
  else if((lParam&0xc000ffff)==1){ //有键按下 dXK~ Z:  
   switch(wParam) W%jX-  
   { IDk:jO  
    case VK_MENU: TeN1\rA,  
     MaskBits|=ALTBIT; Ci#5@Q9#w  
     break; S>ylAU;N  
    case VK_CONTROL: .pu`\BW>  
     MaskBits|=CTRLBIT; `bi_)i6Low  
     break; fPk9(X;G!p  
    case VK_SHIFT: oj4)7{  
     MaskBits|=SHIFTBIT; }HQT@&=  
     break; ,IVr4#w0=  
    default: //judge the key and send message )i6U$,]  
     break; d[Fr  
   } 5_tK3Q8?  
   for(int index=0;index<MAX_KEY;index++){ CR<pB)F?a  
    if(hCallWnd[index]==NULL) )'I<xx'1  
     continue; PS<tS_.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sxQ,x/O  
    { 7!yF5 +_d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); W9:{pQG  
     bProcessed=TRUE; my\oC^/9  
    } Z FrXw+  
   } Ef*.}gcU  
  } sFz4^Kn  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 nTtt$I@hW  
   for(int index=0;index<MAX_KEY;index++){ yNMwd.r[  
    if(hCallWnd[index]==NULL) I3[RaZ2z{  
     continue; OFAqP1o{$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {j=hQL3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <!HD tN  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 LAVt/TcZS|  
   } ;eEtdoy  
  } SFPIr0 u  
 } vFvu8*0  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); C%7)sLWjJS  
} X1z0'gvh  
4y}a,  
  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: Y&Vbf>Hi+  
mE@o27  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Pc ?G^ Xol  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); F1[ [fH  
3\l9Sf=M|  
  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: ]~ 8N  
<.B > LU  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) mt]YY<l  
{ wU3ica&[   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 5OqsnL_V  
 { tZBE& :l  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 UHl/AM> !  
  SaveBmp(); t:@A)ip  
  return FALSE;  >33b@)  
 } `TR9GWU+B  
 …… //其它处理及默认处理 (2\ekct ^  
} (>lqp%G~  
ej53O/hP  
/@}# K P=  
  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。 cZF;f{t  
,^[37/S  
  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。 0$h$7'a  
6]A\8Ty  
  二、编程步骤 7 ,~Krzv  
,ui'^8{gK  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; jN{xpd  
Jj!tRZT  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 5:3$VWLa <  
T ]nR XW$  
  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; Vw@x  
 X_S]8Aa  
  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; F7u%oLjr  
(=B7_jrl  
  5、 添加代码,编译运行程序。 %z_b/yG  
5*'N Q010  
三、程序代码 6 FxndR;  
) G&3V  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL  p.Yg-CA  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) _BaS\U%1(  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ f5XcBW9E  
#if _MSC_VER > 1000 WSccR  
#pragma once BqAwo  
#endif // _MSC_VER > 1000 X"59`Yh  
#ifndef __AFXWIN_H__ bGnJ4R3J  
#error include 'stdafx.h' before including this file for PCH eb woMG,B-  
#endif j`M<M[C*4N  
#include "resource.h" // main symbols BnY|t2r  
class CHookApp : public CWinApp (&x\,19U$  
{ J3E:r_+  
 public: 3/<^R}w\  
  CHookApp(); J-?(sjIX  
  // Overrides ?^GsR[-x  
  // ClassWizard generated virtual function overrides -+Ji~;b  
  //{{AFX_VIRTUAL(CHookApp) A+ *(Pds  
 public: GB Un" _J  
  virtual BOOL InitInstance(); rxA)&  
  virtual int ExitInstance(); NGGd6V%'-  
  //}}AFX_VIRTUAL /P}tgcs  
  //{{AFX_MSG(CHookApp) :iiTz$yk  
  // NOTE - the ClassWizard will add and remove member functions here. pODo[Rkq  
  // DO NOT EDIT what you see in these blocks of generated code ! 2;7GgO~  
  //}}AFX_MSG ~OfKn1D  
  DECLARE_MESSAGE_MAP() wWswuhq<  
}; O@&I.d$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); KAEpFobYo  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U.jMK{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); I=I%e3GEm  
BOOL InitHotkey(); <xz-7EqbwX  
BOOL UnInit(); P?ol]MwaB  
#endif JH,bSb  
U^S:2  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. nrhpI d  
#include "stdafx.h" 4tKf  
#include "hook.h" AMfu|%ZL  
#include <windowsx.h> W]]2Uo.  
#ifdef _DEBUG 1S@k=EKM  
#define new DEBUG_NEW (G'ddZAJV  
#undef THIS_FILE ,urkd~  
static char THIS_FILE[] = __FILE__; :Dm@3S$4<  
#endif 8)ol6Mi{  
#define MAX_KEY 100 l8li@K  
#define CTRLBIT 0x04 j* ja)  
#define ALTBIT 0x02 DzOJ{dF  
#define SHIFTBIT 0x01 ~qxc!k!w4  
#pragma data_seg("shareddata") 2M`Ni&v  
HHOOK hHook =NULL; ^ZBkt7  
UINT nHookCount =0; m>:ig\  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey wpmtv325  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT x&p=vUuukP  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 2AE|N_v8W  
static int KeyCount =0; >rGlj  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift m8`A~  
#pragma data_seg() >?x Vr  
HINSTANCE hins; 6P $q7G  
void VerifyWindow(); GQ8P}McA  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) u^9,u/gj  
//{{AFX_MSG_MAP(CHookApp) 7MfvU|D[d/  
// NOTE - the ClassWizard will add and remove mapping macros here. Jl}7]cVq#  
// DO NOT EDIT what you see in these blocks of generated code! ~=Sr0+vV  
//}}AFX_MSG_MAP }=)"uv  
END_MESSAGE_MAP() 93,ExgFt  
,+{ 43;a  
CHookApp::CHookApp() N/p_6GYMa  
{ v<**GW]neD  
 // TODO: add construction code here, xbIA97g-O,  
 // Place all significant initialization in InitInstance 5$w1[}UUd  
} _E7eJSM.  
@n3PCH6:Ao  
CHookApp theApp; }%|OnEk"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <9vkiEo  
{ y3GIR f;>  
 BOOL bProcessed=FALSE; !Zx>)V6.  
 if(HC_ACTION==nCode)  7dIDKx  
 { \:S8mDI^s  
  if((lParam&0xc0000000)==0xc0000000){// Key up =#Jb9=zdR  
   switch(wParam) ?Ci\3)u,P  
   { z@}~2K  
    case VK_MENU: X*&r/=  
     MaskBits&=~ALTBIT; `^x^= og'  
     break; Bf'(JJ7&N  
    case VK_CONTROL: /xnhHwJm  
     MaskBits&=~CTRLBIT; 7Q&P4{hi0  
     break; )LUl?  
    case VK_SHIFT: g;1 UZE;  
     MaskBits&=~SHIFTBIT; vF 1$$7k  
     break; 6w#v,RDEu  
    default: //judge the key and send message e V#H"fM  
     break; c{0?gt.  
   } Q=E6ZxH5;  
   for(int index=0;index<MAX_KEY;index++){ ] a()siT  
    if(hCallWnd[index]==NULL) #t*c*o  
     continue; hR2.w/2j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) K(Nk|gQ  
    { &/" qOZAs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ar_/9@n  
     bProcessed=TRUE; 5irOK9hK  
    } ah.Kb(d:  
   } WJWrLu92\U  
  } %|~ UNP$  
  else if((lParam&0xc000ffff)==1){ //Key down Y,r2m nq  
   switch(wParam) SQ[}]Tm;n  
   { }#1{GhsS  
    case VK_MENU: Q*5d~Yr]R  
     MaskBits|=ALTBIT; bBf+z7iyc  
     break; |m% &Qb  
    case VK_CONTROL: g}7B0 yo  
     MaskBits|=CTRLBIT; 0%GWc}o  
     break; uB?YJf .T@  
    case VK_SHIFT: TnrMR1Zx  
     MaskBits|=SHIFTBIT; mCo5 Gdt  
     break;  u[u=:Y+  
    default: //judge the key and send message ,b8AB_yw  
     break; \v<}{\.|$  
   } R:E:Y|&#  
   for(int index=0;index<MAX_KEY;index++) LxO'$oKZV  
   { 0J" 3RTt  
    if(hCallWnd[index]==NULL) &W%TY:Da|  
     continue; DX|kO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cW2:D$Pe  
    { ,$Mw/fA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); :d;5Q\C`  
     bProcessed=TRUE; 2t'&7>Ys{  
    } :>;#/<3{  
   } J&?kezs  
  } S;C3R5*:  
  if(!bProcessed){ gV c[`( @h  
   for(int index=0;index<MAX_KEY;index++){ 0qv)'[O  
    if(hCallWnd[index]==NULL) @ NF8?>!  
     continue; f{J7a1 `_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) "(5}=T@,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >; Bhl|r~z  
   } 0WFZx Ad"  
  } d0,I] "  
 } "v06F j>q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )]}*oO  
} BsAglem  
@UA>6F  
BOOL InitHotkey() 6 eBQ9XV  
{ LLMkv!%D  
 if(hHook!=NULL){  Y+N87C<  
  nHookCount++; X$aMf &x  
  return TRUE; )c*~Y=f  
 } <5.{+!BM  
 else ` mi!"pmw  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); m-:k]9I  
  if(hHook!=NULL) cGD A0#r  
   nHookCount++; (8{Z@  
  return (hHook!=NULL); >&TktQO_T  
} T'XRl@  
BOOL UnInit() OCd[P1Y]  
{ W^x[ma z  
 if(nHookCount>1){ @1pdyKK  
  nHookCount--; B3D4fYQ  
  return TRUE; gm8H)y,  
 } ^a]:GPc  
 BOOL unhooked = UnhookWindowsHookEx(hHook); FR&RIFy  
 if(unhooked==TRUE){ REw3>/=  
  nHookCount=0; >TE&myZ?*  
  hHook=NULL; [x&&N*>N  
 } 1Dbe0u  
 return unhooked; # ;9KDt@  
} `yhL11 ]~  
yP@= x!$  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) } E=mZZ)  
{ lIf Our  
 BOOL bAdded=FALSE; U> >J_2  
 for(int index=0;index<MAX_KEY;index++){ o)$sZ{` ="  
  if(hCallWnd[index]==0){ 67e1Y@Xu  
   hCallWnd[index]=hWnd; ]KfHuYjM  
   HotKey[index]=cKey; ,Ya&M@^Z  
   HotKeyMask[index]=cMask; 0YS*=J"7z  
   bAdded=TRUE; q*T+8 O  
   KeyCount++; cc>h=%s`  
   break; -{O2Nv-]]  
  } qAU]}Et/  
 } f7`y*9^  
 return bAdded; sU8D;ML7  
} Qcw/>LaL:  
k_ skn3,u  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A4# m&o  
{ aoBM _#  
 BOOL bRemoved=FALSE; n4:WM+f4  
 for(int index=0;index<MAX_KEY;index++){  2}`OjVS  
  if(hCallWnd[index]==hWnd){ rnW i<Se  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ DCNuvrZ  
    hCallWnd[index]=NULL; U{ Y)\hR-  
    HotKey[index]=0; A_2ppEG  
    HotKeyMask[index]=0; i,~{{XS<  
    bRemoved=TRUE; (<f[$ |%  
    KeyCount--; N>/U%01a  
    break; wC[J=:]tA5  
   } !:>y.^O  
  } 6 2LZ}yn_"  
 } 0]Li "Wb  
 return bRemoved; ]t,ppFC#  
} NZl0sX.:  
ur'A;B  
void VerifyWindow() GUK/Xiu  
{ qvT9d7x  
 for(int i=0;i<MAX_KEY;i++){ u^`B#b '  
  if(hCallWnd!=NULL){ 8T%z{A1T  
   if(!IsWindow(hCallWnd)){ `527vK 6  
    hCallWnd=NULL; !6kLg1  
    HotKey=0; D3_,2  
    HotKeyMask=0; Q=+KnE=h  
    KeyCount--; <@?bYp  
   } 4Iz~3fqB7  
  } E)`+1j  
 } FuD$jsEw  
} 1|zo -'y  
G6I>Ry[2?  
BOOL CHookApp::InitInstance() SnVnC09y  
{ 0iwx$u 7[  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); j/9'L^]  
 hins=AfxGetInstanceHandle(); |=SaI%%Be  
 InitHotkey(); 6@bO3K|  
 return CWinApp::InitInstance(); gHTo|2 Q{  
} v67o>`<$  
FzNs >*  
int CHookApp::ExitInstance() %=GnGgu  
{ :HwB+Bjy  
 VerifyWindow(); 9XS'5AXN  
 UnInit(); |n~- LH++  
 return CWinApp::ExitInstance(); pN?  
} VG)kPKoi  
.aNy)Yu8  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file lwa  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ]/U)<{6  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ :V8 \^  
#if _MSC_VER > 1000 Ix}:!L  
#pragma once Jz3u r)|  
#endif // _MSC_VER > 1000 Og^b'Kx/  
`,xKK+~YG-  
class CCaptureDlg : public CDialog gi~*1RIel;  
{ 0kmZO"K#e  
 // Construction 'sJYt^  
 public: "/wZtc  
  BOOL bTray; hMDy;oQ  
  BOOL bRegistered; AuWEy-q?  
  BOOL RegisterHotkey(); p*vEVo  
  UCHAR cKey; b]@^SN9  
  UCHAR cMask; 0p8(Q  
  void DeleteIcon(); u3kZOsG  
  void AddIcon(); hv8V=Z'Q  
  UINT nCount; WOquG  
  void SaveBmp(); RHeql*`  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor $O=m/l $  
  // Dialog Data ^hLAMaR  
  //{{AFX_DATA(CCaptureDlg) B!6?+< J"  
  enum { IDD = IDD_CAPTURE_DIALOG }; yyG:Kl  
  CComboBox m_Key; G 9d@vu  
  BOOL m_bControl; E7ixl~  
  BOOL m_bAlt; U }xRvNz  
  BOOL m_bShift; { "=d7i  
  CString m_Path; wU+-;C5e  
  CString m_Number; -FdhV%5]  
  //}}AFX_DATA ]Z6==+mCP  
  // ClassWizard generated virtual function overrides E{|j  
  //{{AFX_VIRTUAL(CCaptureDlg) usX aT(K  
 public: F~4oPB K<  
  virtual BOOL PreTranslateMessage(MSG* pMsg); BlMc<k  
 protected: k\I+T~~xD  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support n-0RA~5z  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Q`'w)aV  
  //}}AFX_VIRTUAL g"^<LX-  
  // Implementation 6Xbo:#  
 protected: $SA8$!:  
  HICON m_hIcon; 8Y_wS&eB  
  // Generated message map functions HvLvSy1U  
  //{{AFX_MSG(CCaptureDlg) Xb.WI\Eh  
  virtual BOOL OnInitDialog(); }GRZCX>  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 7:<co  
  afx_msg void OnPaint(); tWT@%(2~0  
  afx_msg HCURSOR OnQueryDragIcon(); } U\n:@:2B  
  virtual void OnCancel(); (w `9*1NO  
  afx_msg void OnAbout(); cl/}PmYIZ  
  afx_msg void OnBrowse(); r< sx On  
  afx_msg void OnChange(); |aIY  
 //}}AFX_MSG ,p {|f}0  
 DECLARE_MESSAGE_MAP() 73 ix4C  
}; 09HlL=0q  
#endif AQ7w5}g+V  
%i 6i.TF  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file f+d[Q1  
#include "stdafx.h" }\?UmuolQ  
#include "Capture.h" EPkmBru ^  
#include "CaptureDlg.h" 3]$qY_|7  
#include <windowsx.h> .0}]/%al  
#pragma comment(lib,"hook.lib") tUaDwIu#  
#ifdef _DEBUG 2= S;<J  
#define new DEBUG_NEW Db3# ;  
#undef THIS_FILE 1<IF@__  
static char THIS_FILE[] = __FILE__; G AI( =  
#endif &>,c..Ke  
#define IDM_SHELL WM_USER+1 Ahv%Q%m%2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -T$%MX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Q+YYj  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; j]~;|V5Z  
class CAboutDlg : public CDialog nJC/yS |  
{ 6R1}fdHvP  
 public: jbZ%Y0km%  
  CAboutDlg(); gE;r;#Jt4  
  // Dialog Data B~xT:r  
  //{{AFX_DATA(CAboutDlg) Y)lYEhF  
  enum { IDD = IDD_ABOUTBOX }; l3[2b Qx  
  //}}AFX_DATA W:VRLT>w>  
  // ClassWizard generated virtual function overrides 3g ep_ aC  
  //{{AFX_VIRTUAL(CAboutDlg) ,aq0Q<}~lc  
 protected: 1g<jr.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support % s&l^&ux  
  //}}AFX_VIRTUAL N/CL?Z>c  
  // Implementation ny'?Hl'Q  
 protected: J'4Pp<  
  //{{AFX_MSG(CAboutDlg) IqD;*  
  //}}AFX_MSG ;@/^hk{A  
  DECLARE_MESSAGE_MAP() 9+S$,|9  
}; KUD&vqx3  
C ^QpVt-T  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) jTHgh>n  
{ wX/0.aZ|  
 //{{AFX_DATA_INIT(CAboutDlg) z'"e|)  
 //}}AFX_DATA_INIT Es]:-TR  
} P]cC2L@Vbi  
f(SK[+aqW  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) g  Z!q  
{ GoSdo  
 CDialog::DoDataExchange(pDX); 9:9gam  
 //{{AFX_DATA_MAP(CAboutDlg) 3:wN^!A}ve  
 //}}AFX_DATA_MAP 3mP251"dIW  
} 2J;_9 g&M  
,9~=yC  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) e2F{}N  
 //{{AFX_MSG_MAP(CAboutDlg) b';oFUU>Q  
 // No message handlers 6~b)Hc/  
 //}}AFX_MSG_MAP ^GL>xlZ(  
END_MESSAGE_MAP() sx1w5rj.Y0  
JiN>sEAM  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 1RHFWK5Si  
: CDialog(CCaptureDlg::IDD, pParent)  :d) y  
{ ngLpiU0H&  
 //{{AFX_DATA_INIT(CCaptureDlg) X iW~? *Z  
  m_bControl = FALSE; X\Gbs=sf6  
  m_bAlt = FALSE; Gv\39+9 =  
  m_bShift = FALSE; i0q<,VSl$_  
  m_Path = _T("c:\\"); ! mb<z^>5  
  m_Number = _T("0 picture captured."); ^ jYE4gHM  
  nCount=0; Q  h~  
  bRegistered=FALSE; K&'Vd@  
  bTray=FALSE; , ;$SRQ.  
 //}}AFX_DATA_INIT y <] x  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 qe[P'\]L  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); H3#rFO"C*  
} W6^YFN  
fug F k  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Gg TrIF  
{ 7ILb&JQ!%{  
 CDialog::DoDataExchange(pDX); 6N< snBmd  
 //{{AFX_DATA_MAP(CCaptureDlg) r}nz )=\Cj  
  DDX_Control(pDX, IDC_KEY, m_Key); ~8 S2BV3@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); eXA@J[- M:  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 8*&|Q1`K:  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); )`5=6i  
  DDX_Text(pDX, IDC_PATH, m_Path); &iI5^b-P  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ssY5g !%  
 //}}AFX_DATA_MAP SX1w5+p$C  
} F<0GX!p4u  
O_ 4 j"0  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) N!lQ;o'  
//{{AFX_MSG_MAP(CCaptureDlg) Wj I NY  
 ON_WM_SYSCOMMAND() s:zz 8oN  
 ON_WM_PAINT() 5}Z_A?gy  
 ON_WM_QUERYDRAGICON()  $*$X5  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Eg+ z(m$M  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) $97EeE:{M  
 ON_BN_CLICKED(ID_CHANGE, OnChange) q=x1:^rVH  
//}}AFX_MSG_MAP ^~` t q+  
END_MESSAGE_MAP() CNM pyr  
Vw";< <0HZ  
BOOL CCaptureDlg::OnInitDialog() p>h&SD?b  
{ ;%^T*?t  
 CDialog::OnInitDialog();  Uys[0n  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); tRYi q  
 ASSERT(IDM_ABOUTBOX < 0xF000); }rA _4%  
 CMenu* pSysMenu = GetSystemMenu(FALSE); _z6" C8W  
 if (pSysMenu != NULL) *f-8egt-  
 { ]k)h<)nY  
  CString strAboutMenu; v43FU3  
  strAboutMenu.LoadString(IDS_ABOUTBOX); (|dN6M-.K  
  if (!strAboutMenu.IsEmpty()) HDQH7Bs  
  {  ovsI2  
   pSysMenu->AppendMenu(MF_SEPARATOR); #`qP7E w  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); \Xpq=2`  
  } @)x8<  
 } q?$<{Z"  
 SetIcon(m_hIcon, TRUE); // Set big icon } m&La4E  
 SetIcon(m_hIcon, FALSE); // Set small icon 1X-fiQJe  
 m_Key.SetCurSel(0); >Pwu>  
 RegisterHotkey(); ? t_$C,A+  
 CMenu* pMenu=GetSystemMenu(FALSE); :9]"4ktoJ  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); =bh.V@*  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ~]78R!HJ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); <G60R^o  
 return TRUE; // return TRUE unless you set the focus to a control DAVgP7h'  
} QHPC?a6CD  
wS;hC&~2  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Bhf4 /$  
{ ^GC 8^f  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) s#>``E!  
 { v]@ n'!  
  CAboutDlg dlgAbout; k:DAko}  
  dlgAbout.DoModal(); G F17oMi  
 } ; %mYsQ  
 else 8m*uT< 5D  
 { ->*'Y;t4  
  CDialog::OnSysCommand(nID, lParam); vv^(c w>A  
 } 8/T,.<5  
} C@OY)!x!  
^"{txd?6  
void CCaptureDlg::OnPaint() j-(k`w\  
{ zC|y"PTw  
 if (IsIconic()) (aX6jdvo  
 { !cA4erBP  
  CPaintDC dc(this); // device context for painting xC YL3hl  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); |#J!oBS!  
  // Center icon in client rectangle JG*Lc@Q  
  int cxIcon = GetSystemMetrics(SM_CXICON); M?.[Rr-uw  
  int cyIcon = GetSystemMetrics(SM_CYICON); r8TNl@Z  
  CRect rect; us>$f20T  
  GetClientRect(&rect); gaVQ3NqF  
  int x = (rect.Width() - cxIcon + 1) / 2; cUD}SOW  
  int y = (rect.Height() - cyIcon + 1) / 2; A5kz(pj  
  // Draw the icon 'D[g{LkL  
  dc.DrawIcon(x, y, m_hIcon); CAtdx!  
 } Y N*"q'Yz_  
 else Hq."_i{I  
 { -iySU 6  
  CDialog::OnPaint(); vJfj1 f  
 } |yYu!+U  
} 2>h.K/pC  
n+H);Dg<8  
HCURSOR CCaptureDlg::OnQueryDragIcon() DcX,o*ec!  
{ |n*<H|  
 return (HCURSOR) m_hIcon; j7v?NY  
} ZE4xF8  
$94l('B6H  
void CCaptureDlg::OnCancel() ZuVes?&j  
{ <69Uq8GI  
 if(bTray) by@}T@^\  
  DeleteIcon(); `>N_A!pr`  
  CDialog::OnCancel(); .!yw@kg  
} v6*8CQ+  
<j&LC /]o  
void CCaptureDlg::OnAbout() U`)o$4Bq  
{ KpSho<  
 CAboutDlg dlg; lAA s/  
 dlg.DoModal(); +@jX|  
} sY@x(qkIOc  
![hVTZ,hyZ  
void CCaptureDlg::OnBrowse() ;6/dFOZn  
{ D>m!R[!o  
 CString str; qcR"i+b  
 BROWSEINFO bi; m6YDyQC  
 char name[MAX_PATH]; obtXtqew  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); oa:30@HSb  
 bi.hwndOwner=GetSafeHwnd(); ?)mM]2%%  
 bi.pszDisplayName=name; ?n9?`8a#  
 bi.lpszTitle="Select folder"; K-,8~8[  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; IHStN,QD  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); \iM  
 if(idl==NULL) q&0I7OV  
  return; 6rg?0\A<  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); KQ2jeJ/pj  
 str.ReleaseBuffer(); +"F9yb  
 m_Path=str; JVt(!%K}&  
 if(str.GetAt(str.GetLength()-1)!='\\') >'e(|P4  
  m_Path+="\\"; kzXmiBL<9  
 UpdateData(FALSE); 5$Da\?Fpn  
} q}MPl2  
]}HuK#  
void CCaptureDlg::SaveBmp() mrId`<L5l{  
{ 6ujePi <U  
 CDC dc; U]W+ers  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); T Z_](%  
 CBitmap bm; 7FvtWE*  
 int Width=GetSystemMetrics(SM_CXSCREEN); FCPi U3  
 int Height=GetSystemMetrics(SM_CYSCREEN); \A=:6R%Qb  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ' Y cVFi  
 CDC tdc; # 25%17  
 tdc.CreateCompatibleDC(&dc); $G .ws  
 CBitmap*pOld=tdc.SelectObject(&bm); -$+`v<[r  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Avr2MaY{h  
 tdc.SelectObject(pOld); s6.#uT7h  
 BITMAP btm; _7Rp.)[&  
 bm.GetBitmap(&btm); k-X E|v  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; n2(@uT&>  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); KL4vr|i,  
 BITMAPINFOHEADER bih; t8\XO j  
 bih.biBitCount=btm.bmBitsPixel; U6 $)e.FO  
 bih.biClrImportant=0; U3 y-cgE  
 bih.biClrUsed=0; ^L +@oS  
 bih.biCompression=0; 5V"g,]'Nd  
 bih.biHeight=btm.bmHeight; :$?^ID  
 bih.biPlanes=1; h4lrt  
 bih.biSize=sizeof(BITMAPINFOHEADER); ZA Xw=O5  
 bih.biSizeImage=size; /R!/)sg  
 bih.biWidth=btm.bmWidth; 3 F ke#t  
 bih.biXPelsPerMeter=0; uIb,n5  
 bih.biYPelsPerMeter=0; M qG`P  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); c037#&Q%#  
 static int filecount=0; )%D>U  
 CString name; |)WN%#v  
 name.Format("pict%04d.bmp",filecount++); 76j5  
 name=m_Path+name; FatLc|[  
 BITMAPFILEHEADER bfh; ( S=RFd  
 bfh.bfReserved1=bfh.bfReserved2=0; 0Z<&M|G  
 bfh.bfType=((WORD)('M'<< 8)|'B'); y8|?J\eRy  
 bfh.bfSize=54+size; KOHYeiry~A  
 bfh.bfOffBits=54; U f <hzP  
 CFile bf; {B,r  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ]v,>!~8r  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); QfHO3Y6h[  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); %jnSJjcq  
  bf.WriteHuge(lpData,size); csNB  \  
  bf.Close(); ;Uv/#"r  
  nCount++; yo@S.7[/  
 } L] ce13K  
 GlobalFreePtr(lpData); }Rx`uRx\  
 if(nCount==1) r[Zg$CW  
  m_Number.Format("%d picture captured.",nCount); w!N?:}P<N  
 else oP 4z>  
  m_Number.Format("%d pictures captured.",nCount); M9scZuj  
  UpdateData(FALSE); ERQc1G]3Dd  
} j!;y!g  
:^[HDI-[2  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) TqN4OkCm/  
{ vk] vtjf&%  
 if(pMsg -> message == WM_KEYDOWN) z-X_O32  
 { i6y$P6s  
  if(pMsg -> wParam == VK_ESCAPE) @ky<5r*JU(  
   return TRUE;  ]H_|E  
  if(pMsg -> wParam == VK_RETURN) TEYn^/n~  
   return TRUE; {'e%Hx  
 } T_=iJ: Q  
 return CDialog::PreTranslateMessage(pMsg); gvl3NQQ%t  
} <4m@WG  
z6+D=<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gV\{Qoj  
{ L/sMAB  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ QqU>V0y"w(  
  SaveBmp(); xJSK"  
  return FALSE; sN%#e+(=  
} *dw6>G0U  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ M7JQw/,xs  
 CMenu pop; KqNbIw*sR  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ]1k"'XG4,  
 CMenu*pMenu=pop.GetSubMenu(0); jQIb :\0#  
 pMenu->SetDefaultItem(ID_EXITICON); DbH"e  
 CPoint pt; . vJlTg  
 GetCursorPos(&pt); K,' v{wSr  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); OqcM3#  
 if(id==ID_EXITICON) ejjL>'G/|%  
  DeleteIcon(); 1#m'u5L  
 else if(id==ID_EXIT) B=p6p f  
  OnCancel(); UBZ37P  
 return FALSE; g{d(4=FM  
} |*5803h  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); G &LOjd 2  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 5y`n8. (?  
 AddIcon();   iE8  
 return res; f}C$!Lhs  
} ccPTJ/%$  
{BS}9jZx  
void CCaptureDlg::AddIcon() o&Vti"fpC  
{ {Jx-Zo>'  
 NOTIFYICONDATA data; ~#^suy?  
 data.cbSize=sizeof(NOTIFYICONDATA); Or9"T]z  
 CString tip; XVwJr""+  
 tip.LoadString(IDS_ICONTIP); ;p_@%*JAx  
 data.hIcon=GetIcon(0); m:  
 data.hWnd=GetSafeHwnd(); _hz}I>G@B  
 strcpy(data.szTip,tip); V ~%C me  
 data.uCallbackMessage=IDM_SHELL; a#L:L8T;j  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; pSC\[%K  
 data.uID=98; #FNSE*Y  
 Shell_NotifyIcon(NIM_ADD,&data); o,D7$WzL  
 ShowWindow(SW_HIDE); <jwQ&fm)/R  
 bTray=TRUE; "7X[@xX@  
} ?Xq"Q^o4#e  
9>I&Z8J$M  
void CCaptureDlg::DeleteIcon() (O@fgBM  
{ <Mq vGXI  
 NOTIFYICONDATA data; 2^;zj0]Rt  
 data.cbSize=sizeof(NOTIFYICONDATA); V }?MP-.c  
 data.hWnd=GetSafeHwnd(); rT mVHt  
 data.uID=98; r|,_qNrw  
 Shell_NotifyIcon(NIM_DELETE,&data); dvX[,*wz  
 ShowWindow(SW_SHOW); }8e_  
 SetForegroundWindow(); q@(MD3OE  
 ShowWindow(SW_SHOWNORMAL); mN&B|KWU  
 bTray=FALSE; K275{ydN  
} \a7caT{  
B}U:c]  
void CCaptureDlg::OnChange() +$;* "o  
{  2.>aL  
 RegisterHotkey(); ;.'\8!j  
} `:>N.9'o  
yRyUOTK  
BOOL CCaptureDlg::RegisterHotkey() S8Ec.]T   
{ 9(AY7]6  
 UpdateData(); `Hp=1a  
 UCHAR mask=0; p`I[3/$3  
 UCHAR key=0; m*f"Y"B.1I  
 if(m_bControl) =euMOs  
  mask|=4; .X](B~\!  
 if(m_bAlt) 6a!b20IZh  
  mask|=2; V<&^zIJUR  
 if(m_bShift) ARd*c?Om  
  mask|=1; nd #owjB  
  key=Key_Table[m_Key.GetCurSel()]; o6Jhl8  
 if(bRegistered){ dMlJ2\ ]u  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); &)ED||r,  
  bRegistered=FALSE; E gD$A!6N8  
 } .:I^O[k  
 cMask=mask; :6[G;F7s  
 cKey=key; 9pMXjsE   
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); pAtt=R,Ht  
 return bRegistered; ]*]#I?&'Hx  
} =!N,{V_  
8quH#IhB  
  四、小结 ZTg[}+0e  
bHK[Z5  
  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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