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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: SU.T0>w  
  e9;<9uX  
  一、实现方法 x8Rmap@L.  
LYPjdp2>"o  
  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: (yv&&Jc  
)W!8,e+%  
#pragma data_seg("shareddata") m$xL#omD  
HHOOK hHook =NULL; //钩子句柄 48CLnyYiF  
UINT nHookCount =0; //挂接的程序数目 +53 Tf  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 q/Dc*Qn m  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 k&4@$;Ap  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey >&mlwxqv  
static int KeyCount =0; Gn+D%5)$I  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Gxu&o%x [  
#pragma data_seg() e%w>QN`  
-b "7WBl  
  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。 |:SBkM,  
*ktM<N58  
  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: u+eA>{  
)A9K9pZj  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR l@Vl^f~P  
cKey,UCHAR cMask) Qi' ,[Xmf  
{ 6LRI~*F=3  
 BOOL bAdded=FALSE; E~5r8gM,0  
 for(int index=0;index<MAX_KEY;index++){ 5 T1M:~u i  
  if(hCallWnd[index]==0){ h V@C|*A  
   hCallWnd[index]=hWnd; wkK61a h6  
   HotKey[index]=cKey; $ Scb8<  
   HotKeyMask[index]=cMask; ?y82S*sb#  
   bAdded=TRUE; [6Y6{.%~  
   KeyCount++; {yQeLION  
   break; E(A7DXzbR  
  } \x i wp.  
 } @O#4duM4Qz  
 return bAdded; 2Q`@lTUv  
} 1\:puC\)  
//删除热键 A-e#&pJ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) W8j)2nKD  
{ vh3Xd\N  
 BOOL bRemoved=FALSE; /w0l7N  
 for(int index=0;index<MAX_KEY;index++){ Q6Z%T.1  
  if(hCallWnd[index]==hWnd){ qt5CoxeJ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ l\7NR  
    hCallWnd[index]=NULL; _ETG.SYq  
    HotKey[index]=0; fyIL/7hzf4  
    HotKeyMask[index]=0; (#FWA<o  
    bRemoved=TRUE; `f`\j -Lu  
    KeyCount--; 6]^; s1!  
    break; )NJD+yQ%  
   } y#8| @?  
  } ; mF-y,E  
 } Mw2?U>h1  
 return bRemoved; M7BCBA  
} &/*XA  
tL(B gku9  
0qXd?z$  
  DLL中的钩子函数如下: k`Nc<nN8  
WUx}+3eWv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \tTZ N  
{ Bsi HVr  
 BOOL bProcessed=FALSE; zK893)  
 if(HC_ACTION==nCode) Qi`Lj5;\F  
 { 1lZl10M:f  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 MkZm =Sf  
   switch(wParam) kFmd):U!R  
   {  :U!knb"/>  
    case VK_MENU: _#xS1sD  
     MaskBits&=~ALTBIT; e`ti*1]q  
     break; DK 4 8  
    case VK_CONTROL: >oi`%V  
     MaskBits&=~CTRLBIT; ,-^Grmr4M  
     break; uc9t0]o=h  
    case VK_SHIFT: o@j]yA.5)  
     MaskBits&=~SHIFTBIT; %[0V>  
     break; so}(*E&(a  
    default: //judge the key and send message '&,$"QXwE  
     break; _cdrz)T  
   } r4/G&m[V  
   for(int index=0;index<MAX_KEY;index++){ E>f+E8?  
    if(hCallWnd[index]==NULL) |f1 S&b.  
     continue; )$K )`uqb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <a7y]Py  
    { KB49~7XjQ@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @Z> {/  
     bProcessed=TRUE; ~*RG|4#  
    } 4eTfb  
   } t%Hg8oya  
  } NfizX!w&  
  else if((lParam&0xc000ffff)==1){ //有键按下 FWI<_KZ O  
   switch(wParam) UN#XP$utY  
   { \}Fx''  
    case VK_MENU: wYy=Tl-N  
     MaskBits|=ALTBIT; k4jZu?\C]  
     break; ;Ak<O[  
    case VK_CONTROL: AE!DftI  
     MaskBits|=CTRLBIT; ;Z|X` <6g  
     break; s<VNW  
    case VK_SHIFT: GJN"43  
     MaskBits|=SHIFTBIT; (A(7?eq  
     break; =W'a6)WE  
    default: //judge the key and send message N"SFVc_2  
     break; :N$^x /{  
   } KDr?<"2L  
   for(int index=0;index<MAX_KEY;index++){ |PR8P!'  
    if(hCallWnd[index]==NULL) .lnyn|MVb  
     continue; rOd<nP^`\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) P34UD:  
    { /H.w0fu&.S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); vAWJP_;J  
     bProcessed=TRUE; g&eIfm  
    } ^\=<geEj  
   } xl [3*K   
  } ~< %%n'xmm  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 QND{3Q  
   for(int index=0;index<MAX_KEY;index++){ F]]1>w*/0  
    if(hCallWnd[index]==NULL) ?O3E.!Q|  
     continue; aphfzo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }jHS  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); zOJ4I^^  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 B].V|8h  
   } 4/UY*Us&  
  } Xc"l')1H  
 } i) v ]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -]yM<dP  
} {*utke]}*  
n;&08M5an}  
  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: to9~l"n.s  
eC`} oEz  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~[n]la  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \fC)]QZ  
[7x,&  
  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: $ 9bIUJ  
`pr$l  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) zT$-%  
{ I`hltJM'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) A|jmp~@K)+  
 { co!o+jP  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 \j C[|LM&  
  SaveBmp(); y04md A6<  
  return FALSE; pJ8;7u  
 } Fuq MT`  
 …… //其它处理及默认处理 J,N='~kfh  
} Dp1FX"a)  
9*fA:*T  
KX8$j$yW  
  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。 3=YK" 5J  
: jgvg$fd  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Iv,Ub_Ll9  
_8zZ.~)  
  二、编程步骤 GSlvT:k  
ng,64(wOY  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; \iN3/J4  
87&BF)]  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; wY$'KmNW  
S  ^5EG;[  
  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; Ug}dw a  
Sr$&]R]^  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; -@*[   
j%w}hGW%,  
  5、 添加代码,编译运行程序。 6?B'3~ r  
K;uOtbdOK  
三、程序代码 R0 yPmh,{  
cXcrb4IKD  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL }uZtAH|  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) [K5#4k  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ TNi4H:\  
#if _MSC_VER > 1000 SynL%Y9)|,  
#pragma once w_gFN%8  
#endif // _MSC_VER > 1000 +-%&,>R  
#ifndef __AFXWIN_H__ yT3q~#:  
#error include 'stdafx.h' before including this file for PCH 4?eO1=a  
#endif u/s,#  
#include "resource.h" // main symbols (w1M\yodV  
class CHookApp : public CWinApp aL)}S%5o?  
{ [nSlkl   
 public: mZ%"""X\Ei  
  CHookApp(); 4O I''i  
  // Overrides v@xbur\L  
  // ClassWizard generated virtual function overrides `Zdeq.R]  
  //{{AFX_VIRTUAL(CHookApp) 2YW| /o4  
 public: Pn?,56SD=  
  virtual BOOL InitInstance(); OEZ`5"j  
  virtual int ExitInstance(); hq[:U?!Tt  
  //}}AFX_VIRTUAL to2#PXf]y  
  //{{AFX_MSG(CHookApp) K^z u{`S  
  // NOTE - the ClassWizard will add and remove member functions here. ?cyBF*o  
  // DO NOT EDIT what you see in these blocks of generated code ! \OzPDN  
  //}}AFX_MSG 2`Dqu"TWh  
  DECLARE_MESSAGE_MAP() # dA-dN  
}; {4C/ZA{|l  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); B,x ohT  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T'W@fif  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); vk1E!T9X  
BOOL InitHotkey(); DqH?:`G  
BOOL UnInit(); KfPYH\ 0  
#endif Wx8oTN  
9Z[EzKd<~'  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 1WP(=7$.  
#include "stdafx.h" ,P>xpfdK  
#include "hook.h" 1(YEOZ  
#include <windowsx.h> qH=<8Iu  
#ifdef _DEBUG [^D~T  
#define new DEBUG_NEW sC}p_'L  
#undef THIS_FILE I$y6N"|  
static char THIS_FILE[] = __FILE__; @CB&*VoB  
#endif cWU9mzsE  
#define MAX_KEY 100 5R%4fzr&g  
#define CTRLBIT 0x04  Lw1aG;5  
#define ALTBIT 0x02 {CaTu5\  
#define SHIFTBIT 0x01 f(*ygI  
#pragma data_seg("shareddata") T?4I\SG  
HHOOK hHook =NULL; a[hQ<@1O  
UINT nHookCount =0; w<$0n#5  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey "3e1 7dsY  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT IRY/0v  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey p`T,VU&.  
static int KeyCount =0; CU_8 `}  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift bVW2Tjc:  
#pragma data_seg() aC,?FWm  
HINSTANCE hins; :#nv:~2]  
void VerifyWindow(); K<~J*k<v  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) OqlP_^Zz7p  
//{{AFX_MSG_MAP(CHookApp) TBu[3X%  
// NOTE - the ClassWizard will add and remove mapping macros here. 4u+4LB*  
// DO NOT EDIT what you see in these blocks of generated code! E0_S+`o2y  
//}}AFX_MSG_MAP y8/+kn +  
END_MESSAGE_MAP() x>eV$UJ  
bTJ l  
CHookApp::CHookApp() ^M7pCetjdW  
{ :Lh`Q"a  
 // TODO: add construction code here, ]~t4E'y)z  
 // Place all significant initialization in InitInstance pGT?=/=*  
} i+4!nf{K  
p8|u0/;k  
CHookApp theApp; g;._Q   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) C~q&  
{ 9Pjw< xt  
 BOOL bProcessed=FALSE; |N%#;7  
 if(HC_ACTION==nCode) 1qN+AT  
 { W_Eur,/`  
  if((lParam&0xc0000000)==0xc0000000){// Key up  mm9xO%  
   switch(wParam) u[+/WFH  
   { U "kD)\  
    case VK_MENU: 'l&bg8K9  
     MaskBits&=~ALTBIT; /;9iDjG  
     break; M) Z3q  
    case VK_CONTROL: #@8JYzMq%  
     MaskBits&=~CTRLBIT; 0;SRmj@W  
     break; qg9VK'3o  
    case VK_SHIFT: +A%"_7L}  
     MaskBits&=~SHIFTBIT; x) OJ?l  
     break; WwAvR5jq  
    default: //judge the key and send message j5~nLo2  
     break; NjP7?nXSx  
   } U_61y;Q"  
   for(int index=0;index<MAX_KEY;index++){ Z;[f,Oj  
    if(hCallWnd[index]==NULL) Kp?j\67S  
     continue; P{%R*hb]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U2HAIV8  
    { Q@5v> `  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Pt[ b;}  
     bProcessed=TRUE; hB??~>i3  
    } &T2qi'  
   } ix!4s613w  
  } {1m.d;(1  
  else if((lParam&0xc000ffff)==1){ //Key down IZ 3e:  
   switch(wParam) *Vr;rk  
   { +~f5dJyk`  
    case VK_MENU:  LAO2Py#  
     MaskBits|=ALTBIT; \z[L=  
     break; [&K"OQ^\2h  
    case VK_CONTROL: m 7/b.B}  
     MaskBits|=CTRLBIT; <nbc RO.  
     break; *28:|blbL  
    case VK_SHIFT: /Q\|u:oO,  
     MaskBits|=SHIFTBIT; H:!pFj  
     break; &7Lg) PG  
    default: //judge the key and send message |tdsg  
     break; c'&\[b(m  
   } z%44@TP  
   for(int index=0;index<MAX_KEY;index++) '/ *;g#W=  
   { $@@@</VbP  
    if(hCallWnd[index]==NULL) |[/'W7TV%?  
     continue; @r9[&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DE!P[$J  
    { ql(~3/kA_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); bm#/ KT_8  
     bProcessed=TRUE; Yrmd hSY  
    } PIZK*Lop  
   } KAR **Mp+  
  } #s3R4@{  
  if(!bProcessed){ JYO("f  
   for(int index=0;index<MAX_KEY;index++){ A? T25<}  
    if(hCallWnd[index]==NULL) }E&48$0h  
     continue; MVOWJaT(Aq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #Z1 <lAy  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /j;HM[  
   } MoMxKmI  
  } WI\jm&H r  
 } _8&a%?R@W  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4'GosQ85  
} W'L  
I/Q~rVt  
BOOL InitHotkey() xa$4P [  
{ B)=)@h[f  
 if(hHook!=NULL){ + 3c (CTz  
  nHookCount++; VkZ3Q7d  
  return TRUE;  re@;6o  
 } EN;4EC7tE  
 else :XCRKRDLE  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); eh}I?:(a?  
  if(hHook!=NULL) cs7K^D;.V  
   nHookCount++; G}#p4 \/  
  return (hHook!=NULL); T/iZ"\(~w  
} |ohCA&k%;  
BOOL UnInit() UthM?g^  
{ ZfnJ&H'  
 if(nHookCount>1){ J{e`P;ND  
  nHookCount--; OSIf>1  
  return TRUE; *:8,w?Nt  
 } 0i~?^sT'  
 BOOL unhooked = UnhookWindowsHookEx(hHook); y!/:1BHlm  
 if(unhooked==TRUE){ dlCmSCp%  
  nHookCount=0; |^C35 6M>  
  hHook=NULL; )| 0(#R  
 } !MEA@^$#  
 return unhooked; rHJtNN8$k  
} Hl=M{)q@   
LZ z]4Mf  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) PXo^SHJ+gt  
{ R/Te ;z  
 BOOL bAdded=FALSE; sPRo=LB  
 for(int index=0;index<MAX_KEY;index++){ 5;X3{$y  
  if(hCallWnd[index]==0){ :[?65q{  
   hCallWnd[index]=hWnd; !n|4w$t"V  
   HotKey[index]=cKey; a 3C\?5  
   HotKeyMask[index]=cMask; Yge}P:d9  
   bAdded=TRUE; /PZxF  
   KeyCount++; =&#t ("  
   break; tb;u%{S  
  } x bD]EC  
 } hGb SN_F  
 return bAdded; FZx.Yuv  
} T0"q,lrdxV  
)M_|r2dDq3  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) F5%IsAH  
{ n7pjj  
 BOOL bRemoved=FALSE; cHX~-:KOr  
 for(int index=0;index<MAX_KEY;index++){ +k\cmDcb  
  if(hCallWnd[index]==hWnd){ jO}<W1qy  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `ZGKM>q`  
    hCallWnd[index]=NULL; T[%@B"  
    HotKey[index]=0; E^? 3P'%^  
    HotKeyMask[index]=0; L16">,5  
    bRemoved=TRUE; n..R'vNj  
    KeyCount--; !'*1;OQ  
    break; 3Uy(d,N  
   } nTCwLnX(O  
  } . H9a  
 } *Ke\Yb  
 return bRemoved; Uf#9y182*c  
} 9YY*)5eyD  
M?QX'fia  
void VerifyWindow() O6 n]l  
{ Xd5uF/w  
 for(int i=0;i<MAX_KEY;i++){ M`H@ % M  
  if(hCallWnd!=NULL){ cBQ+`DXn5c  
   if(!IsWindow(hCallWnd)){ \-CL}Z}S  
    hCallWnd=NULL; .x][ _I>  
    HotKey=0; l09DH+  
    HotKeyMask=0; i/RA/q  
    KeyCount--; Xp0S  
   } 6-QcHJ>m6U  
  } r=S,/N(1  
 } A$-\Er+f  
} e`zCz`R  
l!j,9wz7  
BOOL CHookApp::InitInstance() DeTLh($\  
{ G<Y}QhFU  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); tgC)vZ&a  
 hins=AfxGetInstanceHandle(); 9{8xMM-  
 InitHotkey(); h@fF`  
 return CWinApp::InitInstance(); AtNF&=Op  
} <ToRPx&E  
;&$f~P Q  
int CHookApp::ExitInstance() X9;51JV  
{ ;nAI;Qw L  
 VerifyWindow(); Zx)gLDd  
 UnInit(); }X~"RQf9  
 return CWinApp::ExitInstance(); 3u[5T|D'  
} 6&_K;  
r b*;4a  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file M=Y['w x  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ?<1~KLPMhY  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Ch73=V  
#if _MSC_VER > 1000 g9gi7.'0  
#pragma once remRm Y?  
#endif // _MSC_VER > 1000 T+41,  
$Z<x r  
class CCaptureDlg : public CDialog YR u#JYti  
{ ,$Xhwr  
 // Construction uLSuY}K0  
 public: Y=Om0=v  
  BOOL bTray; /]-a 1  
  BOOL bRegistered; \WxBtpbQ B  
  BOOL RegisterHotkey(); |>KOlwh5n  
  UCHAR cKey; Wv]ODEd  
  UCHAR cMask; 5IfC8drAs  
  void DeleteIcon(); z oZ10?ojC  
  void AddIcon(); UdcrX`^.  
  UINT nCount; gl 27&'?E*  
  void SaveBmp(); ^xQPj6P}  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 3<_=Vyf  
  // Dialog Data xM![  
  //{{AFX_DATA(CCaptureDlg) 6 tl#AJ-  
  enum { IDD = IDD_CAPTURE_DIALOG }; %|'VucLx  
  CComboBox m_Key; rDv`E^\  
  BOOL m_bControl; ^Vg-fO]V  
  BOOL m_bAlt; xB5QM #w\  
  BOOL m_bShift; u,./,:O%=  
  CString m_Path; #@J{ )  
  CString m_Number; $'3'[Nr(;t  
  //}}AFX_DATA v(p<88.!m  
  // ClassWizard generated virtual function overrides A~H@0>1  
  //{{AFX_VIRTUAL(CCaptureDlg) /6:qmh2  
 public: :D~J(Y2  
  virtual BOOL PreTranslateMessage(MSG* pMsg); @.L/HXu-P  
 protected: UmG|_7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support BbhC 0q"J  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); \k5 sdHmI[  
  //}}AFX_VIRTUAL h}Lrpr2r  
  // Implementation GK1oS  
 protected: 395`Wkv  
  HICON m_hIcon; Q096M 0m  
  // Generated message map functions y7x*:xR[  
  //{{AFX_MSG(CCaptureDlg) 6N[X:F 3`,  
  virtual BOOL OnInitDialog(); fWyXy%Qq  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Mk}*ze0%  
  afx_msg void OnPaint(); +asO4'r  
  afx_msg HCURSOR OnQueryDragIcon(); TT={>R[B  
  virtual void OnCancel(); hG >kx8h  
  afx_msg void OnAbout(); {RI)I  
  afx_msg void OnBrowse(); .mplML0oW  
  afx_msg void OnChange(); u{S"NEc  
 //}}AFX_MSG 8khIy-9-'  
 DECLARE_MESSAGE_MAP() -PTfsQk  
}; 9# #(B  
#endif a#a n+JY3  
5,?^SK|'x  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file B`:l;<&jX  
#include "stdafx.h" 3 Scc"9]  
#include "Capture.h" slaH2}$xR  
#include "CaptureDlg.h" -6$GM J7  
#include <windowsx.h> W&v|-#7=6  
#pragma comment(lib,"hook.lib") o{3>n" \w3  
#ifdef _DEBUG 0wt4C% .0  
#define new DEBUG_NEW ~-#Jcw$+n=  
#undef THIS_FILE 9-!GYa'Z  
static char THIS_FILE[] = __FILE__; bu{dT8g'U  
#endif tac\Ki?  
#define IDM_SHELL WM_USER+1 6G{ Q@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $e:bDZ(hjj  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #I\" 'n5M  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; V3ExS1fNf  
class CAboutDlg : public CDialog <==6fc>s  
{ g([M hf#  
 public: AF>t{rw=/  
  CAboutDlg(); KW/LyiP#  
  // Dialog Data I3u)y|Y=  
  //{{AFX_DATA(CAboutDlg) ZS[Ut  
  enum { IDD = IDD_ABOUTBOX }; D"exI]  
  //}}AFX_DATA )KOIf{  
  // ClassWizard generated virtual function overrides }i J$&CJ  
  //{{AFX_VIRTUAL(CAboutDlg) tV h"C%Vkr  
 protected: ] !n3j=*   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Pbt7T Q  
  //}}AFX_VIRTUAL IyAD>Q^  
  // Implementation @M"( r"ab  
 protected: '$ [%x  
  //{{AFX_MSG(CAboutDlg) =|dHD  
  //}}AFX_MSG V>D}z8w7  
  DECLARE_MESSAGE_MAP() ,&L}^Up  
}; qfjUJ/  
$W%-Mm  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) W}#n.c4+  
{ wF3 MzN=%  
 //{{AFX_DATA_INIT(CAboutDlg) r"|.`$:B  
 //}}AFX_DATA_INIT C[5dhFZ  
} ^PUB~P/  
}}Z2@}  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6"; ITU^v  
{ mF4y0r0  
 CDialog::DoDataExchange(pDX); .A0fI";Q  
 //{{AFX_DATA_MAP(CAboutDlg) qae|?z  
 //}}AFX_DATA_MAP MBAj.J  
} Qe-PW9C  
<W+9 h0c  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) VfozqUf  
 //{{AFX_MSG_MAP(CAboutDlg) '8[; m_S  
 // No message handlers Tgh?=]H  
 //}}AFX_MSG_MAP -hc8IS  
END_MESSAGE_MAP() v0?SN>fZ  
 tq?a3  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 8H|ac[hXK2  
: CDialog(CCaptureDlg::IDD, pParent) `YqXF=-  
{ `jVRabZ0  
 //{{AFX_DATA_INIT(CCaptureDlg) ( 4# iLs  
  m_bControl = FALSE; `F3wO!  
  m_bAlt = FALSE; E^$8nqCL:  
  m_bShift = FALSE; =- ,'LOE  
  m_Path = _T("c:\\"); .h\Py[h<^  
  m_Number = _T("0 picture captured."); |>Fz:b d  
  nCount=0; V7.g,  
  bRegistered=FALSE; u:mndTpB6x  
  bTray=FALSE; M93*"jA  
 //}}AFX_DATA_INIT N9*:]a  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 uP(t+}dQ+3  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); IUNr<w<  
} CD%Cb53  
XMdCQ=  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) H \'1.8g/  
{ ZCV i ZWo  
 CDialog::DoDataExchange(pDX); 64]8ykRD-  
 //{{AFX_DATA_MAP(CCaptureDlg) DEbMb6)U  
  DDX_Control(pDX, IDC_KEY, m_Key); PQa0m)H@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); tY: Nq*@  
  DDX_Check(pDX, IDC_ALT, m_bAlt); zWH)\>X59  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); x,zYNNx5g  
  DDX_Text(pDX, IDC_PATH, m_Path); -y{(h% 6  
  DDX_Text(pDX, IDC_NUMBER, m_Number); pb)kN%  
 //}}AFX_DATA_MAP gS8+S\2  
} *,IK4F6>:  
:HwdXhA6  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) EB*C;ms  
//{{AFX_MSG_MAP(CCaptureDlg) n1PBpM9!  
 ON_WM_SYSCOMMAND() u0A$}r$L  
 ON_WM_PAINT() 2dcvB]T!  
 ON_WM_QUERYDRAGICON() F-oe49p5e  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) >\w]i*%  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) vB}c6A4'U  
 ON_BN_CLICKED(ID_CHANGE, OnChange) r7L.W  
//}}AFX_MSG_MAP 1z-A3a/-  
END_MESSAGE_MAP() O6vxp?:^  
/|<S D.:  
BOOL CCaptureDlg::OnInitDialog() =,h'}(z_  
{ [`s0 L#  
 CDialog::OnInitDialog(); j--byk6PB  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); &9|L Z9K  
 ASSERT(IDM_ABOUTBOX < 0xF000); S[zGA<}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); XH@(V4J(.  
 if (pSysMenu != NULL) ' QMcQvU  
 { u&^KrOM@#  
  CString strAboutMenu; '&dT   
  strAboutMenu.LoadString(IDS_ABOUTBOX); z;F HZb9t,  
  if (!strAboutMenu.IsEmpty()) O"Nr$bS(Y  
  { C#^y{q  
   pSysMenu->AppendMenu(MF_SEPARATOR); jT}={[9b  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ^+v1[U@  
  } g(;OUkj$Zp  
 } ZWo~!Z[Y  
 SetIcon(m_hIcon, TRUE); // Set big icon k54\H.  
 SetIcon(m_hIcon, FALSE); // Set small icon =QGmJ3  
 m_Key.SetCurSel(0); x^EW'-a  
 RegisterHotkey(); 74MxU  
 CMenu* pMenu=GetSystemMenu(FALSE); Mgi~j.[  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); p)ig~kk`  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 3T0~k--  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); lWtfcU?S[  
 return TRUE; // return TRUE unless you set the focus to a control 8Znr1=1   
} 6ulx0$[  
K@{0]6  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $#p5BQQ|  
{ 6<$.Z-,  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) J"LLj*,0"  
 { Sk/@w[  
  CAboutDlg dlgAbout; ) $b F*  
  dlgAbout.DoModal(); BV:Ca34&  
 } Ie/_gz^  
 else CLzF84@W=  
 { JX&]>#6|E  
  CDialog::OnSysCommand(nID, lParam); JxtzI2  
 } PiM(QR  
} b4cTn 6  
wg%Z  
void CCaptureDlg::OnPaint() XjN =UhC  
{ Rf8Obk<  
 if (IsIconic()) 9!n95  
 { @y7KP$t  
  CPaintDC dc(this); // device context for painting p-{ 4 $W  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); S1Y,5,}  
  // Center icon in client rectangle X}(X\rp  
  int cxIcon = GetSystemMetrics(SM_CXICON); Mb2a;s  
  int cyIcon = GetSystemMetrics(SM_CYICON); xaVX@ 3r.3  
  CRect rect; /B?wn=][  
  GetClientRect(&rect); z0 /+P  
  int x = (rect.Width() - cxIcon + 1) / 2; ]vz6DJs  
  int y = (rect.Height() - cyIcon + 1) / 2; 8%m\J:e R  
  // Draw the icon H"? 5]!p  
  dc.DrawIcon(x, y, m_hIcon); #;a+)~3*O  
 } hzr, %r  
 else _]o7iqtv  
 { iXo; e  
  CDialog::OnPaint();  VQH48{X  
 } DCiU?u~  
} Zqm%qm:  
X5/j8=G H`  
HCURSOR CCaptureDlg::OnQueryDragIcon() 'uL$j=vB  
{ !9 kNL  
 return (HCURSOR) m_hIcon; |OF3O,5z  
} #oTVfY#  
g]L8Jli  
void CCaptureDlg::OnCancel() }C_g;7*  
{ F]6G<6T[  
 if(bTray) I2CI9,0  
  DeleteIcon(); jy.L/s  
  CDialog::OnCancel(); w:%NEa,Z  
} A+M4=  
6jc5B#  
void CCaptureDlg::OnAbout() w}l^B>Zz  
{ e_epuki  
 CAboutDlg dlg; <}~ /. Cx  
 dlg.DoModal(); ]l fufjj  
} (Ud"+a  
A]0R?N9wb_  
void CCaptureDlg::OnBrowse() Z1q<) O1QX  
{ =p[Sd*d  
 CString str; paV1o>_Rd  
 BROWSEINFO bi; N<<wg{QO  
 char name[MAX_PATH]; GPh;r7xg6  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 6)YckxN^  
 bi.hwndOwner=GetSafeHwnd(); ?SYmsaSr5  
 bi.pszDisplayName=name; 0AWxU?$A4  
 bi.lpszTitle="Select folder"; H?r~% bh  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Y54yojvV  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); {wSz >,  
 if(idl==NULL) -2}ons(  
  return; bvB7d` wx  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); k8n9zJ8  
 str.ReleaseBuffer(); )UU`uzU;u  
 m_Path=str; R$u1\r1I  
 if(str.GetAt(str.GetLength()-1)!='\\') ? }ff O  
  m_Path+="\\"; !sI^Lh,Y  
 UpdateData(FALSE); (bI/s'?K  
} u{uqK7]+  
mnZfk  
void CCaptureDlg::SaveBmp() GBS+ 4xL|  
{ GJU(1%-  
 CDC dc; t 4M-;y  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ,tZL"  
 CBitmap bm; jpYZ) So-  
 int Width=GetSystemMetrics(SM_CXSCREEN); I+Yq",{%  
 int Height=GetSystemMetrics(SM_CYSCREEN); c]k+ Sx&}  
 bm.CreateCompatibleBitmap(&dc,Width,Height); HI:1Voy  
 CDC tdc; N6BOUU]  
 tdc.CreateCompatibleDC(&dc); WS4DzuZZ  
 CBitmap*pOld=tdc.SelectObject(&bm); N@X6Z!EO  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); It2:2  
 tdc.SelectObject(pOld); {C]tS5$Z  
 BITMAP btm; _Hx'<%hhI  
 bm.GetBitmap(&btm); \uo{I~Qd  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Ed0}$ b  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); nZYO}bv\  
 BITMAPINFOHEADER bih; Lf<urIF  
 bih.biBitCount=btm.bmBitsPixel; \L?A4Qx)_  
 bih.biClrImportant=0; h~%8p ]  
 bih.biClrUsed=0; vY4}vHH2  
 bih.biCompression=0; \O~/^ Y3U!  
 bih.biHeight=btm.bmHeight; #d<"Ub  
 bih.biPlanes=1; 1\lZ&KX$i  
 bih.biSize=sizeof(BITMAPINFOHEADER); <ir]bQT  
 bih.biSizeImage=size; Dh}d-m_5  
 bih.biWidth=btm.bmWidth;  Uv<nJM  
 bih.biXPelsPerMeter=0; _@)-#7  
 bih.biYPelsPerMeter=0; ^u90N>Dvq  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); *e:I*L  
 static int filecount=0; Fku<|1}&y  
 CString name; 7NOF^/nU  
 name.Format("pict%04d.bmp",filecount++); /i_FA]Go  
 name=m_Path+name; qM3NQ8Rm  
 BITMAPFILEHEADER bfh; b$ 8R  
 bfh.bfReserved1=bfh.bfReserved2=0; W%&s$b(  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ?%ltoezf  
 bfh.bfSize=54+size; X<W${L$G  
 bfh.bfOffBits=54; b ~]v'|5[  
 CFile bf; V4Qy^nn1  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ "85)2*+  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); e1V1Ae  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); NTK9`#SA  
  bf.WriteHuge(lpData,size); rN.8-  
  bf.Close(); aS>cXJ;=  
  nCount++; }[c.OJ:  
 } ZhRdml4U2  
 GlobalFreePtr(lpData); iM1E**WCtv  
 if(nCount==1) g^po$%I '  
  m_Number.Format("%d picture captured.",nCount); :YX5%6  
 else iN0'/)ar  
  m_Number.Format("%d pictures captured.",nCount); Zf??/+[  
  UpdateData(FALSE); fpO2bD%$8  
} l  LBzY`j  
G|t0no\f  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !"hzGgOOX  
{ vq3:N'  
 if(pMsg -> message == WM_KEYDOWN) 5L7 nEia'  
 { 5K&A2zC|  
  if(pMsg -> wParam == VK_ESCAPE) }2c&ARQ.m>  
   return TRUE; mL#$8wUdt{  
  if(pMsg -> wParam == VK_RETURN) /c!^(5K fT  
   return TRUE; 5D7k[+6  
 } ;>5]KNj  
 return CDialog::PreTranslateMessage(pMsg); ZifDU@J$t  
} z.h;}QRJ,@  
\j.l1O  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) T.%yeJiE  
{ y^Q);siSy  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ sUiO~<Ozpk  
  SaveBmp(); oxnI/Z  
  return FALSE; +l]> (k.2  
} M,oZ_tY%  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Ui1s ]R  
 CMenu pop; -i91nMi]  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); #Lk~{  
 CMenu*pMenu=pop.GetSubMenu(0); x.Ny@l%]  
 pMenu->SetDefaultItem(ID_EXITICON); 8NNs_~+x}  
 CPoint pt; ;Vf{3  
 GetCursorPos(&pt); >-3>Rjo>  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this);  -V"W  
 if(id==ID_EXITICON) |v#D}E  
  DeleteIcon(); !N][W#:  
 else if(id==ID_EXIT) UbIUc}ge  
  OnCancel(); =jxy4`oF  
 return FALSE; "|,KXv')  
} ~GJ;;v1b2  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); /Q89y[  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Q TN24 q4  
 AddIcon(); c|k(_#\B  
 return res; Ff =%eg]  
} J5<1 6}*  
KCp9P2kv.  
void CCaptureDlg::AddIcon() x",ktE>9  
{ +T,A^(&t  
 NOTIFYICONDATA data; b53s@7/mq  
 data.cbSize=sizeof(NOTIFYICONDATA); HvZSkq^  
 CString tip; |-cXb.M[  
 tip.LoadString(IDS_ICONTIP); 1IT(5Mleb  
 data.hIcon=GetIcon(0); 7j#Ix$Ur  
 data.hWnd=GetSafeHwnd(); bkpN`+c  
 strcpy(data.szTip,tip); <{YzmN\Z  
 data.uCallbackMessage=IDM_SHELL; 23'{{@30  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; FKhgUnw  
 data.uID=98; @FF{lK?[  
 Shell_NotifyIcon(NIM_ADD,&data); ofI,[z3  
 ShowWindow(SW_HIDE); udc9KuR@  
 bTray=TRUE; 1#fR=*ZM"  
} X1[zkb  
p"H /N_b4  
void CCaptureDlg::DeleteIcon() <7L-25 =  
{ *.D{d0A  
 NOTIFYICONDATA data; ZTB6m`  
 data.cbSize=sizeof(NOTIFYICONDATA); 0 xvSi9  
 data.hWnd=GetSafeHwnd(); bJ6H6D>  
 data.uID=98; z/p^C~|}  
 Shell_NotifyIcon(NIM_DELETE,&data); Y ;E'gP-J  
 ShowWindow(SW_SHOW); xh25 *y  
 SetForegroundWindow(); i],~tT|P  
 ShowWindow(SW_SHOWNORMAL); ]F;1l3I-  
 bTray=FALSE; \F+".X#jh  
} Ul 85-p  
/L|x3RHs  
void CCaptureDlg::OnChange() TT#V'r\  
{ 376z~  
 RegisterHotkey(); lh XD9ed  
} Tfv @oPu  
&%(SkL_]  
BOOL CCaptureDlg::RegisterHotkey() *%atE  
{ l0ZK)  
 UpdateData(); L`9.Gf  
 UCHAR mask=0; E7w^A  
 UCHAR key=0; . _Jypk8  
 if(m_bControl) cbzS7q<)  
  mask|=4; 8|L5nQ  
 if(m_bAlt) & \"cV0  
  mask|=2; WYcZD_  
 if(m_bShift) (hKjr1s  
  mask|=1; jzWgyI1b  
  key=Key_Table[m_Key.GetCurSel()]; #~qza ETv,  
 if(bRegistered){ fwUF5Y  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); $DnR[V}rR!  
  bRegistered=FALSE; &wu1Zz[qcz  
 } Y$./!lVY  
 cMask=mask; v5?ct?q  
 cKey=key; :w4N*lV-  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); m?8o\|i,  
 return bRegistered; ;l < amB  
} *o(bB!q"c  
g1l:k1\Ht  
  四、小结 *UG?I|l|I  
lKqFuLHwF  
  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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