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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: ipe8U1Sc  
  Kw7uUJR  
  一、实现方法 U#G<cV79  
2!_DkE  
  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: ()Q#@?c~  
%"Ia]0  
#pragma data_seg("shareddata") (M2hK[  
HHOOK hHook =NULL; //钩子句柄 M?_7*o]!  
UINT nHookCount =0; //挂接的程序数目 7n)ob![\d  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 /!'Png0!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 w m|WER*.  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey YTD&swk  
static int KeyCount =0; 9|WV28PK:  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ][dst@?8Oz  
#pragma data_seg() 6DG%pF,  
"Q`Le{  
  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。 Ay6]vU  
{.])' ~[U  
  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: =o:1Rc7J  
/ K(l[M  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR M`&78j  
cKey,UCHAR cMask) ;4QE.&s`  
{ `\r <3?  
 BOOL bAdded=FALSE; &`IJ55Z-)  
 for(int index=0;index<MAX_KEY;index++){ `x`zv1U  
  if(hCallWnd[index]==0){ .lAPlJOO  
   hCallWnd[index]=hWnd; ;efF]")  
   HotKey[index]=cKey; xpJ=yxO  
   HotKeyMask[index]=cMask; m al?3*x/  
   bAdded=TRUE; H]}mg='kI  
   KeyCount++; mX%T"_^  
   break; pr[V*C/  
  } JM7FVB  
 }  {DD #&B  
 return bAdded; "%YVAaN  
} kX2Z@ w`  
//删除热键 yAFt|<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;\(LovUy6  
{ CofTTYl  
 BOOL bRemoved=FALSE; 3a[LM!  
 for(int index=0;index<MAX_KEY;index++){ dZY|6  
  if(hCallWnd[index]==hWnd){ rJ{k1H>  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Z,DSTP\|  
    hCallWnd[index]=NULL; 8!{ }WLwb  
    HotKey[index]=0; u+O"c  
    HotKeyMask[index]=0; KF6N P  
    bRemoved=TRUE; vm7ag 7@O  
    KeyCount--; Rk-G| 52g  
    break; zE Ly1v\"  
   } EbeSl+iMx_  
  } DX^8w?t  
 } Xf[;^?]X  
 return bRemoved; r PTfwhs  
} $Xh5N3  
0 ;].q*|#  
<MKX F V  
  DLL中的钩子函数如下: !>N+a3   
kCALJRf~d  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "=ki_1/P  
{ QUm[7<"  
 BOOL bProcessed=FALSE;  ^Kl*}  
 if(HC_ACTION==nCode) j/jFS]iC  
 { <J>k%,:B  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 d)3jkHYEjj  
   switch(wParam) !ALq?u  
   {  O6,2M[a  
    case VK_MENU: _kc}:  
     MaskBits&=~ALTBIT; bk1.H@8  
     break; yFn~rv|&G  
    case VK_CONTROL: ILx4 [m7  
     MaskBits&=~CTRLBIT; )%b 5uZ  
     break; Vry*=X &Q  
    case VK_SHIFT: 2r!- zEV  
     MaskBits&=~SHIFTBIT; qnb/zr)p  
     break; hE E1i  
    default: //judge the key and send message oJ tmd}  
     break; B6j/"x6N15  
   } p({Lp}'  
   for(int index=0;index<MAX_KEY;index++){ `Hq*l"8  
    if(hCallWnd[index]==NULL) j"jQiL_*  
     continue; xLb=^Xjec  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (5A8#7a  
    { F-F1^$]k  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); H]W'mm  
     bProcessed=TRUE; Ct^=j@g  
    } )H`V\ H[0P  
   } %Eugy  
  } ;n.h!wmJ}  
  else if((lParam&0xc000ffff)==1){ //有键按下 W56VA>ia  
   switch(wParam) >l #D9%  
   { ,xR u74  
    case VK_MENU: ~Q#! oh'i  
     MaskBits|=ALTBIT; H )>3c1  
     break; lWH#/5`h  
    case VK_CONTROL: Bt#'6::  
     MaskBits|=CTRLBIT; "%bU74>  
     break; t%O)Ti  
    case VK_SHIFT: jo1z#!|Yw}  
     MaskBits|=SHIFTBIT; UCup {pDp  
     break; \D};0#G0&  
    default: //judge the key and send message fq4uiFi<  
     break; L& rtN@5;  
   } DAg*  
   for(int index=0;index<MAX_KEY;index++){ K-"`A.:S  
    if(hCallWnd[index]==NULL) ;at1|E*  
     continue; o bN8+ j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Wsp c ;]&  
    { ;" D~F  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +6}CNC9Mp  
     bProcessed=TRUE; >|`1aCg,  
    } :P ]D`b6p  
   } *2}f $8  
  } X Ai0lN{,  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 1M 6^Brx  
   for(int index=0;index<MAX_KEY;index++){ =HB(N|9_d  
    if(hCallWnd[index]==NULL) EiaP1o  
     continue; i`Qa7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 9 ~$E+ m(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); @4Zkkjc4b  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Pd& Npp3  
   } *_d N9  
  } x4MTE?hT  
 } W8Wjq DQ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *>`6{0, 9  
} {; th~[  
z,hBtq:-$  
  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: ir>S\VT4  
\rATmjsKzS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "'GhE+>Z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G;J)[y  
rC]k'p2x  
  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: X&| R\v=}  
LE)$_i8gX  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @Kn@j D;  
{ yTn<5T[H  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ^16zZ*  
 { R#.H&#  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 e2K9CE.O  
  SaveBmp(); %C@p4  
  return FALSE; p@Cas  
 } KT*>OYI  
 …… //其它处理及默认处理 eE=2~ ylU  
} >4-9 @i0FV  
*0eV9!y  
Zy.ls&<:  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 a1Q%Gn@R  
sekei6#fi  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 .)Pul|)d  
]zCD1 *)  
  二、编程步骤 BX6kn/i  
\t/0Yh-'  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; e*}GQ  
W'f"kM  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 4e;$+! dlV  
%3|/t-US  
  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; 4eG\>#5  
LXsZk|IhM  
  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; AaoS & q  
NQ;$V:s)  
  5、 添加代码,编译运行程序。 )''V}Zn.X  
EaHJl  
三、程序代码 uFb 9Ic]`  
g]c6_DMfb1  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL $o;c:Kh$$  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) D^V)$ME  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ L, #|W  
#if _MSC_VER > 1000 ^c >Bh[  
#pragma once ;"ESN)*|i  
#endif // _MSC_VER > 1000 u??ti OK{  
#ifndef __AFXWIN_H__ !4FOX>|L@  
#error include 'stdafx.h' before including this file for PCH nT +ZSr  
#endif u<N`;s  
#include "resource.h" // main symbols q,%Fvcmx+e  
class CHookApp : public CWinApp /3tErc'  
{ Iu~<Y(8^q#  
 public: 5o>*a>27,A  
  CHookApp(); L;y BZLM  
  // Overrides Ewq@>$_!  
  // ClassWizard generated virtual function overrides rly%+B `/  
  //{{AFX_VIRTUAL(CHookApp) HRjbGc|[  
 public: ~tV7yY|zr  
  virtual BOOL InitInstance(); o)n)Z~  
  virtual int ExitInstance(); I"x~ 7  
  //}}AFX_VIRTUAL A>e-eD xi  
  //{{AFX_MSG(CHookApp) ,6pGKCUU:y  
  // NOTE - the ClassWizard will add and remove member functions here. [^bq?w  
  // DO NOT EDIT what you see in these blocks of generated code ! JR xY#k  
  //}}AFX_MSG VCiq'LOR,<  
  DECLARE_MESSAGE_MAP() @D=%J!!*  
}; 5*-RIs! 2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); m"n" 1;o=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4[JF.O6}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :g' 'GqGZ  
BOOL InitHotkey(); zxIP-QaA  
BOOL UnInit(); Y*p<\{,oC  
#endif HC1<zW[  
nCp_RJu  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. e57R6g)4  
#include "stdafx.h" b SgbvnJ  
#include "hook.h" ~k?wnw  
#include <windowsx.h> }{=}^c"t'  
#ifdef _DEBUG bJ1Nf|3~E  
#define new DEBUG_NEW J~om e7L  
#undef THIS_FILE {fHY[8su0  
static char THIS_FILE[] = __FILE__; )bL(\~0g~  
#endif QT73=>^B  
#define MAX_KEY 100 =Ry8E2NuM  
#define CTRLBIT 0x04 +kEM%z  
#define ALTBIT 0x02 -$:*!55:j  
#define SHIFTBIT 0x01  ;Ss!OFK  
#pragma data_seg("shareddata") L-S5@;"  
HHOOK hHook =NULL; {X{S[(|  
UINT nHookCount =0; |r,})o>  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey x{zZ%_F  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT YcclO  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey vM!2?8bEFd  
static int KeyCount =0; XzX2V">(%  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 5#N<~  
#pragma data_seg() +>;Ux1'@  
HINSTANCE hins; |e+3d3T35  
void VerifyWindow(); !L q'o ?  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) "\`Fu  
//{{AFX_MSG_MAP(CHookApp) V_D wHq2  
// NOTE - the ClassWizard will add and remove mapping macros here. DTM(SN8R+n  
// DO NOT EDIT what you see in these blocks of generated code! Lk@+iHf  
//}}AFX_MSG_MAP a#%*H  
END_MESSAGE_MAP() M*D_p n&  
Tp{ jR<  
CHookApp::CHookApp() 1#7|au%:)  
{ o<Mcc j  
 // TODO: add construction code here, K@xMPB8in  
 // Place all significant initialization in InitInstance ~TXu20c  
} X=Ar"Dx}}s  
UBM#~~sM  
CHookApp theApp; u0sN[<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $gz8! f?  
{ DEhR\Z!  
 BOOL bProcessed=FALSE; Ta/zDc"e  
 if(HC_ACTION==nCode) }cGILH%  
 { z;2& d<h  
  if((lParam&0xc0000000)==0xc0000000){// Key up ?V+\E2  
   switch(wParam) ; S$  
   { :p@jslD  
    case VK_MENU: #>\SK  
     MaskBits&=~ALTBIT; eq8faC5  
     break; e!L5 v?  
    case VK_CONTROL: #3LZX!  
     MaskBits&=~CTRLBIT; YQFz6#Ew  
     break; R@5eHP^  
    case VK_SHIFT: DNgh#!\X  
     MaskBits&=~SHIFTBIT; AB,(%JT/2{  
     break; s_RK x)w@  
    default: //judge the key and send message }fkdv6mz  
     break; ((#BU=0iK  
   } NB'G{),)Z  
   for(int index=0;index<MAX_KEY;index++){ qLb~^'<iD  
    if(hCallWnd[index]==NULL) Qjnh;uBO  
     continue; IA Ma  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2Q]W  
    { `$FX%p  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _Li.}g@Bd  
     bProcessed=TRUE; He4HI Z  
    } 0-{E% k  
   } islHtX VE  
  } 7t#Q8u?  
  else if((lParam&0xc000ffff)==1){ //Key down V#.pi zb  
   switch(wParam) t\ z@k9  
   { &=M4Z/Ao  
    case VK_MENU: 2Og5e  
     MaskBits|=ALTBIT; cT@| $A  
     break; iHc(e(CB<  
    case VK_CONTROL: x\~ <8o  
     MaskBits|=CTRLBIT; QJVB:>A  
     break; oMLs22Do?  
    case VK_SHIFT: p^q/u  
     MaskBits|=SHIFTBIT; +cYDz#3%  
     break; V4}jv7>A  
    default: //judge the key and send message 2ib,33 Z  
     break; 1,$"'lKwt  
   } X[$|I9  
   for(int index=0;index<MAX_KEY;index++) %g5#q64  
   { J!6w9,T_  
    if(hCallWnd[index]==NULL) 8rlf9m  
     continue; lc~c=17  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  E^5  
    { mS;WNlm\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); %O#zE-H"  
     bProcessed=TRUE; L>g6 9D !  
    } X )Tyxppf'  
   } aJjUy%  
  } /=AFle2(  
  if(!bProcessed){ 3)o>sp)Ji$  
   for(int index=0;index<MAX_KEY;index++){ RyukQY~<W  
    if(hCallWnd[index]==NULL) 1i.3P$F  
     continue; }|) N5bGQe  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 4ME$Z>eN  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); fH_l2b[-3@  
   } ;r6YIS4@  
  } ;~$Q;m 1  
 } "x$L 2>9  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); LD NdHG6  
} W)]&G}U<  
p$x>I3C(\  
BOOL InitHotkey() I8T*_u^_  
{ j1->w8  
 if(hHook!=NULL){ W+=j@JY}q9  
  nHookCount++; a=y%+E'a '  
  return TRUE; ZlE=P4`X:  
 } :8}Qt^p  
 else Tmu2G/yi  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); G,P k3>I'  
  if(hHook!=NULL) R=, pv'  
   nHookCount++; xW9R -J \W  
  return (hHook!=NULL); k'&1,78[l  
} 5W|wDy  
BOOL UnInit() FYE(lEjxi  
{ (6mw@gzr  
 if(nHookCount>1){ ThW9=kzQW  
  nHookCount--; mAW(j@5sp  
  return TRUE; lf KV%  
 } _dAn/rj   
 BOOL unhooked = UnhookWindowsHookEx(hHook); L8'4d'N+ >  
 if(unhooked==TRUE){ "%dENK  
  nHookCount=0; @gf <%>  
  hHook=NULL; =MM+(mD  
 } ~Eik&5 z  
 return unhooked; 5eF tcK  
} sh`3${  
{2 T:4i5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) F=*t]X[z}  
{ #hs&)6S f  
 BOOL bAdded=FALSE; <jYyA]Zy5  
 for(int index=0;index<MAX_KEY;index++){ Pj g#  
  if(hCallWnd[index]==0){ FqnD"]A  
   hCallWnd[index]=hWnd; U+4[w`a}  
   HotKey[index]=cKey; jgXr2JQ<  
   HotKeyMask[index]=cMask; 3d1xL+  
   bAdded=TRUE; d Efk~V\  
   KeyCount++; ]c 'EJu  
   break; ']c;$wP  
  } iK1{SgXrFI  
 } 5"!K8 N  
 return bAdded; z52F-<  
} @V1FBw9S!@  
Ygg(qB1q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +"WNG  
{ A(BjU:D(Oj  
 BOOL bRemoved=FALSE; ?aBAmyxm  
 for(int index=0;index<MAX_KEY;index++){ [5-Ik T0  
  if(hCallWnd[index]==hWnd){ g26_#4 P  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){  vmfFR  
    hCallWnd[index]=NULL; [4B (rra  
    HotKey[index]=0; vfhoN]v  
    HotKeyMask[index]=0; $/JXI?K  
    bRemoved=TRUE; =)i^E9  
    KeyCount--; Y Kp@ n8A  
    break; L.K|]]u  
   } a5pM~.]  
  } pK_zq  
 } rij%l+%@#  
 return bRemoved; ~mah.8G  
} 'aD"v>  
<j#IR  
void VerifyWindow() CV{ZoY  
{ :U'n0\  
 for(int i=0;i<MAX_KEY;i++){ VB8eGMo  
  if(hCallWnd!=NULL){ &\6(iL  
   if(!IsWindow(hCallWnd)){ SLNOOEN  
    hCallWnd=NULL; ]0%{ IgB  
    HotKey=0; 3&c'3y:b  
    HotKeyMask=0; ^:f)XZ  
    KeyCount--; }> C?Zx*  
   } t)k;5B`> &  
  } LSXsq}  
 } 5OO XCtIKf  
} ,?%Y*?v  
)ytP$,r![S  
BOOL CHookApp::InitInstance() :AuKQ`c  
{ P&Xy6@%[Z  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); DSp~k)  
 hins=AfxGetInstanceHandle(); :c )R6=v  
 InitHotkey(); UaQW<6+  
 return CWinApp::InitInstance(); z1tCSt}7f  
} ^n4aoj  
wu{%gtx/;^  
int CHookApp::ExitInstance() xZV|QVY;  
{ k!+v*+R+V  
 VerifyWindow(); +[S<"}ls7  
 UnInit(); #Ak9f-pf  
 return CWinApp::ExitInstance(); 9nlj{(  
} $}YN`:{  
]:?hU^H]<  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?=kH}'igq  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 7Ot&]M  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ?G&J_L=@Y  
#if _MSC_VER > 1000 Dp^=%F{t  
#pragma once ~:_10g]r  
#endif // _MSC_VER > 1000 TDg<&ND3  
L/bvM?B^  
class CCaptureDlg : public CDialog Z%3)w.  
{ NJoHrhC='  
 // Construction QOJ5  
 public: | ObA=[j  
  BOOL bTray; 8zJye6f;l  
  BOOL bRegistered; MfFmJ7>Bg  
  BOOL RegisterHotkey(); f|s,%AU"i  
  UCHAR cKey; 7(LB}  
  UCHAR cMask; = 4'r+2[  
  void DeleteIcon(); z!k  
  void AddIcon(); 7vGAuTfi/@  
  UINT nCount; Yc5) ^v  
  void SaveBmp(); EF 8rh  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor w5Ucj*A\  
  // Dialog Data j \ #y  
  //{{AFX_DATA(CCaptureDlg) w/(2fU(  
  enum { IDD = IDD_CAPTURE_DIALOG }; 4}YHg&@\d%  
  CComboBox m_Key; O=!EqaExW  
  BOOL m_bControl; LR"7e  
  BOOL m_bAlt; &oK&vgcj  
  BOOL m_bShift; jcxeXp|00  
  CString m_Path; su8()]|0x  
  CString m_Number; sN1I+X  
  //}}AFX_DATA y,<\d/YY@  
  // ClassWizard generated virtual function overrides \C1`F [d_  
  //{{AFX_VIRTUAL(CCaptureDlg) BBl9<ne$  
 public: Fj <a;oV  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 9Z3Y,`R,  
 protected: =}SC .E\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "!Hm.^1  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Q 9JT6  
  //}}AFX_VIRTUAL  /zir$  
  // Implementation ( M3-S5   
 protected: 5* ~E dT  
  HICON m_hIcon; 0{Zwg0&  
  // Generated message map functions = o1&.v2j  
  //{{AFX_MSG(CCaptureDlg) nC9x N  
  virtual BOOL OnInitDialog(); : +fW#:  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); u H)v\Js  
  afx_msg void OnPaint(); Nb>C5TjR  
  afx_msg HCURSOR OnQueryDragIcon(); a)/ }T  
  virtual void OnCancel(); >- CNHb  
  afx_msg void OnAbout(); +/#Lm#*nu%  
  afx_msg void OnBrowse(); $1D>}5Ex  
  afx_msg void OnChange();  JU=4v!0  
 //}}AFX_MSG cT'<,#^/  
 DECLARE_MESSAGE_MAP() P[Id[}5Pw  
}; @iYr<>iDZ  
#endif BUla2p  
95tHi re  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ::Di  
#include "stdafx.h" P"+K'B7K3  
#include "Capture.h" S%Z2J)H"  
#include "CaptureDlg.h" z }P1+Pm  
#include <windowsx.h> `u;4Z2Lr0  
#pragma comment(lib,"hook.lib") zids2/_*  
#ifdef _DEBUG nqib`U@"  
#define new DEBUG_NEW ~_4$|WKl  
#undef THIS_FILE `g(r.`t^  
static char THIS_FILE[] = __FILE__; Ar[$%  
#endif %h=cwT6  
#define IDM_SHELL WM_USER+1 P# Z+:T  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +[=%W  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {gS7pY%_W  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; B%Z,Xjq  
class CAboutDlg : public CDialog H3BMN}K~  
{ 9M .cTIO{  
 public: &8Oy*'  
  CAboutDlg(); XZpF<7l  
  // Dialog Data %4h$/~  
  //{{AFX_DATA(CAboutDlg) f\vg<lca  
  enum { IDD = IDD_ABOUTBOX }; 3*<~;Z' z4  
  //}}AFX_DATA e?XQ,  
  // ClassWizard generated virtual function overrides Hl*/s  
  //{{AFX_VIRTUAL(CAboutDlg) Z<[f81hE&  
 protected: $4rMYEn08  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +{ {'3=x9  
  //}}AFX_VIRTUAL *JY2vq  
  // Implementation aK'%E3!~=x  
 protected: 8$6^S{M3  
  //{{AFX_MSG(CAboutDlg) !K_ ke h  
  //}}AFX_MSG 7|pF (sb0  
  DECLARE_MESSAGE_MAP() jb!15Vlt"  
}; UE%~SVi.#  
lRA!  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 83gp'W{|  
{ 2S_7!|j  
 //{{AFX_DATA_INIT(CAboutDlg) VaFv%%w  
 //}}AFX_DATA_INIT K<D=QweOon  
} mMtX:  
Bez 7  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ~HyqHx y  
{ J~1 =?</  
 CDialog::DoDataExchange(pDX); bl`vT3  
 //{{AFX_DATA_MAP(CAboutDlg) >{w"aJ" F  
 //}}AFX_DATA_MAP #F|w_P  
} 8j&LU,  
'wP\VCL2>  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) a*KJjl?k  
 //{{AFX_MSG_MAP(CAboutDlg)  Qf(mn8  
 // No message handlers TmO3hKaP  
 //}}AFX_MSG_MAP t(.xEl;Ma  
END_MESSAGE_MAP() JnZlz?}^  
:k7h"w  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 4l"oq"uc  
: CDialog(CCaptureDlg::IDD, pParent) %DF-;M"8  
{ C\C*'l6d  
 //{{AFX_DATA_INIT(CCaptureDlg) Qo \;)  
  m_bControl = FALSE; 3/?{= {  
  m_bAlt = FALSE; $56Z/*  
  m_bShift = FALSE; *mj3  T  
  m_Path = _T("c:\\"); H+2m  
  m_Number = _T("0 picture captured."); \>GHc}  
  nCount=0; p7d[)* L>C  
  bRegistered=FALSE; *^ -~J/  
  bTray=FALSE; >$iQDVh!  
 //}}AFX_DATA_INIT bpWEF b'f  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 BF(.^oh"n0  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); DAtZp%  
} |dQ-l !  
vB9v8@[I&  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ]2o?Gnn@  
{ zz~AoX7V6  
 CDialog::DoDataExchange(pDX); ]&RC<imq  
 //{{AFX_DATA_MAP(CCaptureDlg) L]|[AyNu  
  DDX_Control(pDX, IDC_KEY, m_Key); kc&MO`2 W\  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); xHY#"   
  DDX_Check(pDX, IDC_ALT, m_bAlt); 1 n<7YO7}  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Y)]x1I  
  DDX_Text(pDX, IDC_PATH, m_Path); 6 P6Pl&  
  DDX_Text(pDX, IDC_NUMBER, m_Number); *#2]`G)  
 //}}AFX_DATA_MAP 0h",.  
} 9H4NvB{  
7Eett)4  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) xxC2F:Q?U  
//{{AFX_MSG_MAP(CCaptureDlg) kw Iw=8q~  
 ON_WM_SYSCOMMAND() ?3{:[*  
 ON_WM_PAINT() ] M#OS$_O@  
 ON_WM_QUERYDRAGICON() j* \gD  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) zw,=mpf3_  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) V]$J&aD  
 ON_BN_CLICKED(ID_CHANGE, OnChange) PQFr4EY?i  
//}}AFX_MSG_MAP 8KrqJN0\  
END_MESSAGE_MAP() (lBwkQNQGd  
^saH^kg1"  
BOOL CCaptureDlg::OnInitDialog() <; (pol|  
{ AqHH^adzA:  
 CDialog::OnInitDialog(); 0qU Bt9rA  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 2En^su$  
 ASSERT(IDM_ABOUTBOX < 0xF000); [ym ynr3M  
 CMenu* pSysMenu = GetSystemMenu(FALSE); b _#r_`  
 if (pSysMenu != NULL)  !xz0zT.  
 { ]NrA2i?  
  CString strAboutMenu; J$X{4  
  strAboutMenu.LoadString(IDS_ABOUTBOX); {"x8 q  
  if (!strAboutMenu.IsEmpty()) K~B@8az  
  { I"<ACM  
   pSysMenu->AppendMenu(MF_SEPARATOR); -*I Dzm  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;j]-;wg-;  
  } & NO:S  
 } _:0  
 SetIcon(m_hIcon, TRUE); // Set big icon v0}R]h~>\H  
 SetIcon(m_hIcon, FALSE); // Set small icon ui\yY3?  
 m_Key.SetCurSel(0); -'iV-]<  
 RegisterHotkey(); - P$mN6h  
 CMenu* pMenu=GetSystemMenu(FALSE); <+wbnnK  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Dy[_Ix/Y,  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Anu`F%OzB  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ;m[-yqX  
 return TRUE; // return TRUE unless you set the focus to a control i)pAFv<$,  
} H3{FiB]  
%kRQ9I".  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) )Kw Gb&l&  
{ LyB &u( )  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) AQH\ ;L  
 { 97%S{_2m/  
  CAboutDlg dlgAbout; dq&N;kk |  
  dlgAbout.DoModal(); ^t'mfG|DV  
 } :t36]NM  
 else  *Fe  
 { ~ojH$=K>d  
  CDialog::OnSysCommand(nID, lParam); D|`I"N[<  
 } :QV-!  
} =83FCq"  
gISG<!+X^  
void CCaptureDlg::OnPaint() "DniDA  
{ <FfdOK_  
 if (IsIconic()) I#m0n%-[  
 { M@=eWZ<  
  CPaintDC dc(this); // device context for painting !\ckUMZ\  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); TzJp3  
  // Center icon in client rectangle pS vqGJU3  
  int cxIcon = GetSystemMetrics(SM_CXICON); vl{G;[6  
  int cyIcon = GetSystemMetrics(SM_CYICON); ?!4xtOA  
  CRect rect; pW>?%ft.  
  GetClientRect(&rect); cR0OJ'w  
  int x = (rect.Width() - cxIcon + 1) / 2; O~1vX9  
  int y = (rect.Height() - cyIcon + 1) / 2; ~$O.KF:  
  // Draw the icon iksd^\]f  
  dc.DrawIcon(x, y, m_hIcon); wInJ!1  
 } ,a&&y0,  
 else /kLG/ry8l:  
 { PSM~10l,  
  CDialog::OnPaint(); CSC sJE#4  
 } *}hx9:9\B  
} srbU}u3VZ  
E mUA38  
HCURSOR CCaptureDlg::OnQueryDragIcon() =68CR[H  
{ z,"fr%*,N  
 return (HCURSOR) m_hIcon; f ;[\'_.*  
} "5+x6/9b  
EO<{Bj=2  
void CCaptureDlg::OnCancel() 1I{^]]qw  
{ = %O@%v  
 if(bTray) hd@ >p.  
  DeleteIcon(); BO3#*J5S\  
  CDialog::OnCancel(); |V 3AA   
} {g%F 3-  
{Gd<+tQg  
void CCaptureDlg::OnAbout() _qZ?|;o^  
{ HFr#Ql>g  
 CAboutDlg dlg; lBbUA)z6  
 dlg.DoModal(); ]%RX\~Q.4  
} K|n$-WDG}  
^WZcM#~TL  
void CCaptureDlg::OnBrowse() |)7dh B  
{ ? ^E B"{  
 CString str; Y ~|C]O  
 BROWSEINFO bi; Y_H|Fl^  
 char name[MAX_PATH]; a<W[???m/M  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); w _*|u  
 bi.hwndOwner=GetSafeHwnd(); -t<8)9q(  
 bi.pszDisplayName=name; O[tOpf@s.  
 bi.lpszTitle="Select folder"; ]Tb ?k+a  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Vh.9/$xQ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ^X&n-ui   
 if(idl==NULL) rM sd)  
  return; [%8t~zg  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); V8aLPJ0_  
 str.ReleaseBuffer(); ((2 g  
 m_Path=str; NaR/IsN8%  
 if(str.GetAt(str.GetLength()-1)!='\\') 8op,;Z7Y  
  m_Path+="\\"; ugZ-*e7  
 UpdateData(FALSE); HW{si]~q  
} 'pJ46"D@m  
qMk"i@"  
void CCaptureDlg::SaveBmp() `qNhB\  
{ tAPr4n!  
 CDC dc; (&=<UGY(w  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); yEaim~  
 CBitmap bm; E!~Ok  
 int Width=GetSystemMetrics(SM_CXSCREEN); i|@lUXBp  
 int Height=GetSystemMetrics(SM_CYSCREEN); E5#Dn.!~  
 bm.CreateCompatibleBitmap(&dc,Width,Height); -R~!N#y  
 CDC tdc; `30og]F0YJ  
 tdc.CreateCompatibleDC(&dc); V! sT2  
 CBitmap*pOld=tdc.SelectObject(&bm); K%XQdMv  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 9^;)~ G  
 tdc.SelectObject(pOld); *K{-J*   
 BITMAP btm; 5pOb;ry")`  
 bm.GetBitmap(&btm); qhKW6v  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; B{#*PAK=  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ,9(=Iu-?1  
 BITMAPINFOHEADER bih; EXdx$I=X  
 bih.biBitCount=btm.bmBitsPixel; rRTAWAs%T  
 bih.biClrImportant=0; 8y<NT"  
 bih.biClrUsed=0; :GXD-6}^|  
 bih.biCompression=0; (BB&ZUdyv  
 bih.biHeight=btm.bmHeight; KxEy N(n  
 bih.biPlanes=1; SMMV$;O{9  
 bih.biSize=sizeof(BITMAPINFOHEADER); DNP %]{J  
 bih.biSizeImage=size; |C\%H R  
 bih.biWidth=btm.bmWidth; zyznFiE  
 bih.biXPelsPerMeter=0; zL1*w@6  
 bih.biYPelsPerMeter=0; y+ZRh?2  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); <Ae1YHUY  
 static int filecount=0; :'L^zGf  
 CString name; $\W|{u`  
 name.Format("pict%04d.bmp",filecount++); FmRCTH  
 name=m_Path+name; u afSz@`  
 BITMAPFILEHEADER bfh; CXb-{|I}d  
 bfh.bfReserved1=bfh.bfReserved2=0; -,M*j|   
 bfh.bfType=((WORD)('M'<< 8)|'B'); M^i^_}~S;  
 bfh.bfSize=54+size; ;1S~'B&1Q  
 bfh.bfOffBits=54; Mr5E\~K>s  
 CFile bf; @~4Q\^;NX  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ e?Pzhh a  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 5 A/[x $q  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,rvw E  
  bf.WriteHuge(lpData,size); %gF; A*  
  bf.Close(); !>~W5c^  
  nCount++; .{cka]9WJz  
 } u?OyvvpH  
 GlobalFreePtr(lpData); B.wRZDEvc  
 if(nCount==1) @Axwj   
  m_Number.Format("%d picture captured.",nCount); I:6N?lD4}0  
 else IoEIT Kd  
  m_Number.Format("%d pictures captured.",nCount); >dnH  
  UpdateData(FALSE); FME&v Uh/  
} . 6wyu7oK  
w]4=uL6  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) g]'RwI  
{ oKl^Ttr  
 if(pMsg -> message == WM_KEYDOWN) TRQ@=.  
 { [ n[!RddY  
  if(pMsg -> wParam == VK_ESCAPE) 9?VyF'r=  
   return TRUE; ]Iku(<*Ya  
  if(pMsg -> wParam == VK_RETURN) 9#:b+Amzz  
   return TRUE; s Zan.Kc#  
 } ; TaR1e0  
 return CDialog::PreTranslateMessage(pMsg); N;<.::x  
} d?j_L`?+  
~0mO<0~  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -`z`K08sT  
{ d)'am 3Q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ F %OA  
  SaveBmp(); D1&%N{  
  return FALSE; P'.M.I@  
} 9<0p1WO  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ .hYrE5\-  
 CMenu pop; `+IB;G1  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6g/ <FM  
 CMenu*pMenu=pop.GetSubMenu(0); 2>l =oXq  
 pMenu->SetDefaultItem(ID_EXITICON); ~$#"'Tl4J  
 CPoint pt; (dOC ^i  
 GetCursorPos(&pt); 1_D|;/aI  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ]9xuLJ)  
 if(id==ID_EXITICON) '@Zau\xC  
  DeleteIcon(); B8+J0jdg6%  
 else if(id==ID_EXIT) q Ee1OB  
  OnCancel(); I~LN)hqdo  
 return FALSE; P@ gVzx)M  
} a[<'%S#3x  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); XIM!]  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) XcoV27  
 AddIcon(); mv7><C  
 return res; ]0`*gKA  
} m).S0  
QvM+]pdR6  
void CCaptureDlg::AddIcon() (=v :@\r  
{ ` u#'  
 NOTIFYICONDATA data; W6. )7Y,  
 data.cbSize=sizeof(NOTIFYICONDATA); OH`| c  
 CString tip; %9,:  
 tip.LoadString(IDS_ICONTIP); o,| LO$~  
 data.hIcon=GetIcon(0); 9(;5!q,Gsg  
 data.hWnd=GetSafeHwnd();  ~F?vf@k  
 strcpy(data.szTip,tip); /az}<r8  
 data.uCallbackMessage=IDM_SHELL; .A;e` cKb  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; _[zZm*  
 data.uID=98; uFseO9F.2  
 Shell_NotifyIcon(NIM_ADD,&data); Gp0H[-oF  
 ShowWindow(SW_HIDE); r-M:YB  
 bTray=TRUE;  U 6((  
} k)Y}X)\36  
^ olaq(z  
void CCaptureDlg::DeleteIcon() fE1B1j<  
{ 6jv_j[[  
 NOTIFYICONDATA data; d~bZOy  
 data.cbSize=sizeof(NOTIFYICONDATA); XLEEd?Vct9  
 data.hWnd=GetSafeHwnd(); {!? @u?M  
 data.uID=98; !N\<QRb\q  
 Shell_NotifyIcon(NIM_DELETE,&data); ~U] "dbQ  
 ShowWindow(SW_SHOW); wul$lJ?tE  
 SetForegroundWindow(); 8(yZX4OH>  
 ShowWindow(SW_SHOWNORMAL); hu?Q,[+o  
 bTray=FALSE; z >EOQe  
} tDWW 4H  
+D[|Mi  
void CCaptureDlg::OnChange() ~vqVASUc,  
{ |Ai/q6u  
 RegisterHotkey(); (0L7Ivg<  
} 3NI3b-7  
pkW }\r  
BOOL CCaptureDlg::RegisterHotkey() 3V)ef$Y0  
{ 8nt3S m  
 UpdateData(); {M`yYeo  
 UCHAR mask=0; 9g*O;0uz  
 UCHAR key=0; =?o,' n0  
 if(m_bControl) $]V,H"  
  mask|=4; PUt\^ke  
 if(m_bAlt) C$"N)6%q  
  mask|=2; Y(aEp_kV  
 if(m_bShift) !+sC'/  
  mask|=1; RMinZ}/  
  key=Key_Table[m_Key.GetCurSel()]; s)Gnj;  
 if(bRegistered){ IM.sW'E  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); nkI+"$Rz0  
  bRegistered=FALSE; _n6ge*,E  
 } 8Ld`$_E  
 cMask=mask; j -l#n&M  
 cKey=key; #xUX1(  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ``;.Oy6jS  
 return bRegistered; ChvSUaCS  
} t=,ZR}M1`  
b3/@$x<  
  四、小结 #@ClhpLD  
]><K8N3Z  
  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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