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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: 5U$0F$BBp  
  ^u ~Q/ 4  
  一、实现方法 Kn1a>fLaJ_  
E ~<JC"]  
  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: 0 M[EEw3  
lRFYx?y  
#pragma data_seg("shareddata") `d}2O%P  
HHOOK hHook =NULL; //钩子句柄 ukyZes8o K  
UINT nHookCount =0; //挂接的程序数目 /*mI<[xb  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 /h3RmUy   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 h S&R(m  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey + cN8Y}V  
static int KeyCount =0; X l5 A 'h  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 1mG-}  
#pragma data_seg() 2P0*NQ   
s;Q!X ?Q  
  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。 @\#td5'  
/PIcqg  
  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`76rDN  
(f"4,b^]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR _q-*7hCQ`  
cKey,UCHAR cMask) `b$.%S8uj=  
{ SO!8Di  
 BOOL bAdded=FALSE; SwMc pNo  
 for(int index=0;index<MAX_KEY;index++){ wnC81$1l~  
  if(hCallWnd[index]==0){ q(84+{>B  
   hCallWnd[index]=hWnd; fNFY$:4X  
   HotKey[index]=cKey; }pkzH'$HJ  
   HotKeyMask[index]=cMask; C~/a-  
   bAdded=TRUE;  f.)O2=  
   KeyCount++; Sdryol<  
   break; $=4QO  
  } 8$}<, c(  
 } ]c'A%:f<  
 return bAdded; C?eH]hkZ3  
} <Q3c[ Y  
//删除热键 5=ryDrx  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q^")jPd  
{ Y}wyw8g/  
 BOOL bRemoved=FALSE; oUlVI*~ND  
 for(int index=0;index<MAX_KEY;index++){ ujpJ@OWj  
  if(hCallWnd[index]==hWnd){ 3^yK!-Wp(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Nj/ x. X  
    hCallWnd[index]=NULL; jmZI7?<z  
    HotKey[index]=0; )Pv%#P-<  
    HotKeyMask[index]=0; k8zI(5.>  
    bRemoved=TRUE; + {'.7#  
    KeyCount--; }N52$L0[  
    break; $IpccZpA  
   } A.w.rVDD  
  } 6D3B^.r j]  
 } X"%gQ.1|{j  
 return bRemoved; yJIscwF  
} ;aVZ"~a+\  
9hyn`u.  
)8ZH-|N`!E  
  DLL中的钩子函数如下: qJ-/7-$ ^  
dSHDWu&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) AA>P`C$&M  
{ TB31- ()  
 BOOL bProcessed=FALSE; La[V$+Y  
 if(HC_ACTION==nCode) ZbKg~jdF  
 { `Urhy#LC  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 $[ *w"iQ  
   switch(wParam) _|`S3}q|d  
   {  ;!Fn1|)  
    case VK_MENU: r5^eNg k  
     MaskBits&=~ALTBIT; k+*u/neh  
     break; x]j W<A  
    case VK_CONTROL: UJ2U1H54h  
     MaskBits&=~CTRLBIT; xyXa .  
     break; xskz) kk  
    case VK_SHIFT: 2&cT~ZX&'  
     MaskBits&=~SHIFTBIT; m9;SrCN_  
     break; v`T c}c '  
    default: //judge the key and send message n `Ac 3A  
     break; #KvlYZ+1  
   } M<&= S  
   for(int index=0;index<MAX_KEY;index++){ ;$Jo+#  
    if(hCallWnd[index]==NULL) {P-):  
     continue; CTmT@A{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |Y.?_lC  
    { n+R7D.<q!!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .e-#yET  
     bProcessed=TRUE; |DwZ{(R"W  
    } 0> \sQ,T  
   } eyxW 0}[  
  } 2~[juWbz  
  else if((lParam&0xc000ffff)==1){ //有键按下 [nh>vqum  
   switch(wParam) kq-) ^,{y  
   { o2ECG`^b  
    case VK_MENU: * v#o  
     MaskBits|=ALTBIT; f6p/5]=J26  
     break; m4Zk\,1m.|  
    case VK_CONTROL: -nwypu  
     MaskBits|=CTRLBIT; F"mmLao  
     break; %"-5 <6d  
    case VK_SHIFT: %z$#6?OK^  
     MaskBits|=SHIFTBIT; 5bb(/YtFy  
     break; 5mR 1@  
    default: //judge the key and send message J .<F"r>  
     break; '5tCz9}Y  
   } ?V=CB,^  
   for(int index=0;index<MAX_KEY;index++){ Iu6   
    if(hCallWnd[index]==NULL) ! d gNtI@  
     continue; 1Z&(6cDY8M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W*Y/l~x}  
    { glw+l'@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Ho]su?  
     bProcessed=TRUE; ,]D,P  
    } w!XD/j N  
   } =EsavN  
  } (;,sc$H]  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 s#GLJl\E_P  
   for(int index=0;index<MAX_KEY;index++){ qg$ <oL@~~  
    if(hCallWnd[index]==NULL) }-`4DHgq  
     continue; G+m }MOQP7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) r mOj  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 'c~4+o4co  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 E*lxVua  
   } moE2G?R  
  } eJX#@`K  
 } ji= "DYtL  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); R@2X3s:  
} C_Wc5{  
'<uq3?5  
  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: X wtqi@zlE  
\)Cl%Em  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v` r:=K  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); phz&zl D  
FGkVqZ Y2?  
  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: |l!aB(NW  
'hf8ZEW9'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) yDh6KUK  
{ D/' dTrR  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) {c0`Um3&>  
 { 4Po_-4  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Ea=P2:3*  
  SaveBmp(); v-Sd*( 6  
  return FALSE; 6w77YTJ  
 } @j/&m]6%-D  
 …… //其它处理及默认处理 f *)Z)6E  
} Q59W#e)  
W_ ZJ0GuE(  
@o.I;}*N  
  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。 z?//rXuO  
UCWBYC+  
  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。 Ir]\|t  
zW nR6*\  
  二、编程步骤 M3Kfd  
{GUF;V ^  
  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"; 4GM6)"#d  
,z?':TZ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; A2Tw<&Tw(  
,u!sjx  
  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; B/C,.?Or  
-K$)DvV^(E  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; wA.\i  
T9&1VW  
  5、 添加代码,编译运行程序。 wQLSf{2  
DTs;{c  
三、程序代码 }~q5w{_n  
']oQ]Yx0  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL .e5Mnd%$M  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) NEF# }s2=  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ jh$='Gn  
#if _MSC_VER > 1000 et+0FF ,  
#pragma once w#J2 wS  
#endif // _MSC_VER > 1000 A)KZa"EX  
#ifndef __AFXWIN_H__ |K~Nw&rZ]  
#error include 'stdafx.h' before including this file for PCH ]%(2hY~i  
#endif y> (w\K9W  
#include "resource.h" // main symbols xLn%hxm?,  
class CHookApp : public CWinApp H[|~/0?K  
{ d!{r  v  
 public: q'11^V!0  
  CHookApp(); B1Oq!k  
  // Overrides |'2d_vR  
  // ClassWizard generated virtual function overrides =Runf +}  
  //{{AFX_VIRTUAL(CHookApp) LHmZxi?  
 public: <6=c,y  
  virtual BOOL InitInstance(); Vz[C=_m  
  virtual int ExitInstance(); U<-D(J  
  //}}AFX_VIRTUAL CH/rp4NeSy  
  //{{AFX_MSG(CHookApp) ^W@5TkkBQq  
  // NOTE - the ClassWizard will add and remove member functions here. "h ^Z  
  // DO NOT EDIT what you see in these blocks of generated code ! )CyS#j#=  
  //}}AFX_MSG 2BobH_ H  
  DECLARE_MESSAGE_MAP() J-4:H gx  
}; b>$S<td  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); !%>7Dw(kt  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); bN88ua}k{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); iR0y"Cii  
BOOL InitHotkey(); O1kl70,`R  
BOOL UnInit(); ]{LjRSV  
#endif +^<](z  
cGD(.=  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. \C1nZk?3  
#include "stdafx.h" ,=N.FS  
#include "hook.h" Xm 2'6f,  
#include <windowsx.h> rN{ c7/|  
#ifdef _DEBUG 07$o;W@  
#define new DEBUG_NEW iyog`s c  
#undef THIS_FILE 39jG8zr=Z[  
static char THIS_FILE[] = __FILE__; -{+}@?  
#endif w*MpX U<  
#define MAX_KEY 100 wdZ/Xp9]  
#define CTRLBIT 0x04 #89!'W  
#define ALTBIT 0x02 =rK+eG#,  
#define SHIFTBIT 0x01 >OK^D+v"j  
#pragma data_seg("shareddata") 8.~kK<)!  
HHOOK hHook =NULL; E~:x(5'%d  
UINT nHookCount =0; %PJQ%~ A  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey D,ln)["xm  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Q3SS/eNP  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Y4(  
static int KeyCount =0; K4);HJ|=  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 8x{'@WCG%  
#pragma data_seg() bYPKh  
HINSTANCE hins; 'Z|mQZN  
void VerifyWindow(); ctJE+1#PH  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 8sCv]|cn  
//{{AFX_MSG_MAP(CHookApp) bs'n+:X `  
// NOTE - the ClassWizard will add and remove mapping macros here. ]0\MmAJRn  
// DO NOT EDIT what you see in these blocks of generated code! VD\=`r)nT  
//}}AFX_MSG_MAP e0 T\tc  
END_MESSAGE_MAP() A+)`ZTuO  
2Wb]4-  
CHookApp::CHookApp() F}q c0  
{ a@*\o+Su  
 // TODO: add construction code here, K_-MYs.  
 // Place all significant initialization in InitInstance j8`BdKg  
} )F2OT<]m,  
-PQv ?5  
CHookApp theApp; $tS}LN_!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }iuw5dik+  
{ I!?}jo3  
 BOOL bProcessed=FALSE; &! ?eL  
 if(HC_ACTION==nCode) +d;bjo 2  
 { GM<-&s!Uj  
  if((lParam&0xc0000000)==0xc0000000){// Key up Wxe0IXq3Nn  
   switch(wParam) e 3TI|e_  
   { &8 x-o,  
    case VK_MENU: yvYad  
     MaskBits&=~ALTBIT; vZoaT|3 G]  
     break; eGHaY4|  
    case VK_CONTROL: +?!(G}5  
     MaskBits&=~CTRLBIT; 0K2`-mL  
     break; C2Tyoza  
    case VK_SHIFT: o0vUj  
     MaskBits&=~SHIFTBIT; _ORvo{[:  
     break; ;d9QAN&0}  
    default: //judge the key and send message '08=yqy4N  
     break; I 2|Bg,e  
   } ^v`\x5"Vp  
   for(int index=0;index<MAX_KEY;index++){ W{gb:^;zb  
    if(hCallWnd[index]==NULL) 6i~WcAs  
     continue; e)O 4^#i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |H+Wed|  
    { k)Qtfj}uij  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 680o)hh4m>  
     bProcessed=TRUE; d<N:[Y\4l  
    } \K!VNB>h  
   } xK\d4 "  
  } e@OX_t_  
  else if((lParam&0xc000ffff)==1){ //Key down 9 |vLwQ  
   switch(wParam) \} :PLCKT  
   { 5o8EC" 0  
    case VK_MENU: d{7 +w/Zi  
     MaskBits|=ALTBIT; tC9n k5~  
     break; Oo% d]8W  
    case VK_CONTROL: 3kMf!VL  
     MaskBits|=CTRLBIT; 7x4PaX(  
     break; w: Kl6"c  
    case VK_SHIFT: 0=E]cQwh  
     MaskBits|=SHIFTBIT; v oj^pzZ  
     break; EJNU761  
    default: //judge the key and send message nQ,HMXj  
     break; 'ub@]ru|  
   } A=wh@"2  
   for(int index=0;index<MAX_KEY;index++) =zKM=qba  
   { %Qdn  
    if(hCallWnd[index]==NULL) 9c :cw  
     continue; ^qD$z=z-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wT8DSq  
    { @7j AL-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); C={Y;C1  
     bProcessed=TRUE; <;Zmjeb+#  
    } BeoDKdAwY  
   } JHTSUq  
  } Hn+~5@.  
  if(!bProcessed){ !NvI:C_4|  
   for(int index=0;index<MAX_KEY;index++){ l3I:Q^x@  
    if(hCallWnd[index]==NULL) r:ptQo`1-  
     continue; >_"an~Ss  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $6iX   
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); D2B%0sfl~  
   } k5.Lna  
  } X))/ m[_[  
 } <s<n  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); KEjWRwN  
} O5nD+qTQ#  
.MoU1n{Yc  
BOOL InitHotkey() ")XHak.JX  
{ ~;{; ,8!)  
 if(hHook!=NULL){ G^4hd i3@  
  nHookCount++; '^~{@~ ;%L  
  return TRUE; 65$+{s  
 } nwRc%C``UK  
 else V7fq4O^:  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); "Nbq#w\  
  if(hHook!=NULL) #-i>;Rt  
   nHookCount++; UIN<2F_  
  return (hHook!=NULL); ]{mPh\  
} !/i{l  
BOOL UnInit() } .m<  
{ =QiI :|eRA  
 if(nHookCount>1){ mQ 26K~  
  nHookCount--; (b-MMr  
  return TRUE; c>:wd@w  
 } 9} M?P  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ?:I*8Fj  
 if(unhooked==TRUE){ hVAn>_(  
  nHookCount=0; NzOx0WLF  
  hHook=NULL; =BAW[%1b  
 } ryUQU^v  
 return unhooked; ,,Q O^j]4~  
} peuZ&yK+"  
'UX!*5k<:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -Xm'dwm  
{ 9oR@U W1  
 BOOL bAdded=FALSE; ;1O_M9  
 for(int index=0;index<MAX_KEY;index++){ tKx~1-  
  if(hCallWnd[index]==0){ :L@?2),  
   hCallWnd[index]=hWnd; l=)xo@6  
   HotKey[index]=cKey; n QZwC  
   HotKeyMask[index]=cMask; hwBfdZ  
   bAdded=TRUE; 9YQb &  
   KeyCount++; e+ BQww  
   break; {|_M # w~&  
  } *>'V1b4}  
 } Yz"#^j}Kg  
 return bAdded; {xB!EQ"  
} s.N/2F& *W  
Pz|>"'  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) q{I%Q)t)gU  
{ 1 A !bE  
 BOOL bRemoved=FALSE; ~{B7 k:  
 for(int index=0;index<MAX_KEY;index++){ bj0G5dc=  
  if(hCallWnd[index]==hWnd){ A_ N;   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0c'<3@39k|  
    hCallWnd[index]=NULL; KNpl:g3{<Q  
    HotKey[index]=0; #;q dY[v  
    HotKeyMask[index]=0; lN?qp'%H`  
    bRemoved=TRUE; lC("y' ::  
    KeyCount--; #+HJA42  
    break; BsqP?/  
   } 37 ,  
  } Ou!2 [oe@M  
 } bvr^zH,C  
 return bRemoved; 9_rYBX  
} #TX/aKr:  
E+R1 !.  
void VerifyWindow() )Y6 +  
{ i6tf2oqO7  
 for(int i=0;i<MAX_KEY;i++){ ith 3 =`3  
  if(hCallWnd!=NULL){ m}aB?+i  
   if(!IsWindow(hCallWnd)){ A8fOQ  
    hCallWnd=NULL; $i}y8nlQ  
    HotKey=0; RJ ||}5  
    HotKeyMask=0; aS{n8P6vW  
    KeyCount--; ;I 9&]   
   } [.'|_l  
  } <+Dn8  
 } 3<Zq ]jk?n  
} bv9i*]  
?U5{Wa85D  
BOOL CHookApp::InitInstance() UkT=W!cq  
{ T/Gz94c  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); B^Nf #XN(  
 hins=AfxGetInstanceHandle(); ;R5`"`  
 InitHotkey(); %C'?@,7C  
 return CWinApp::InitInstance(); &Gn 2tr  
} fk[-mZ  
H*QIB_  
int CHookApp::ExitInstance() V b4#,  
{ YEs&  
 VerifyWindow(); 7>|J8*/Nd  
 UnInit(); YX7L?=;.@  
 return CWinApp::ExitInstance(); *:YiimOY"  
} C'+YQ]u  
EXwo,?I  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file >CgTs  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Lh"<XYY  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ }Qc@m9;bH  
#if _MSC_VER > 1000 BNl5!X^{  
#pragma once c74.< @w  
#endif // _MSC_VER > 1000 C:* *;=.  
,p@y] cr  
class CCaptureDlg : public CDialog *,)Md[  
{ :q7Wy&ow  
 // Construction k\YG^I  
 public: UcDS9f_87  
  BOOL bTray; *_{j=sd  
  BOOL bRegistered; [vK ^Um  
  BOOL RegisterHotkey(); YTpSHpf@  
  UCHAR cKey; )uIe&B  
  UCHAR cMask; ?)?Ng}  
  void DeleteIcon(); ;| 5F[  
  void AddIcon(); Ar|0b}=)>  
  UINT nCount; el<s8:lA  
  void SaveBmp(); G<8/F<m/  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor e7r -R3_  
  // Dialog Data 9ni1f{k  
  //{{AFX_DATA(CCaptureDlg) C'@i/+  
  enum { IDD = IDD_CAPTURE_DIALOG }; Ae^~Cz1qz  
  CComboBox m_Key; 3!Ij;$  
  BOOL m_bControl; tr3! d_  
  BOOL m_bAlt; ?|C2*?hZ+  
  BOOL m_bShift; %lx!. G  
  CString m_Path; @* jz o  
  CString m_Number; uk]$#TV*q>  
  //}}AFX_DATA ua Gk6S  
  // ClassWizard generated virtual function overrides +I:Unp  
  //{{AFX_VIRTUAL(CCaptureDlg) };bEU wGWf  
 public: nQtWvT  
  virtual BOOL PreTranslateMessage(MSG* pMsg); uR4z &y  
 protected: PbgP\JeX  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `$<.pOm  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); |'8Nh  
  //}}AFX_VIRTUAL Nk 8B_{  
  // Implementation `?qF$g9u~  
 protected: o>i4CCU+  
  HICON m_hIcon; B6As,)RjD:  
  // Generated message map functions 4*#18<u5  
  //{{AFX_MSG(CCaptureDlg) W$;,CU.v  
  virtual BOOL OnInitDialog(); J +DDh=%  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); V`d,qn)i  
  afx_msg void OnPaint(); Bz-c$me1  
  afx_msg HCURSOR OnQueryDragIcon(); S_4?K)n #  
  virtual void OnCancel(); Ugt/rf5n  
  afx_msg void OnAbout(); sPQQ"|wU  
  afx_msg void OnBrowse(); [{,T.;'<j  
  afx_msg void OnChange(); Apag{Z]^B  
 //}}AFX_MSG L>NL:68yN  
 DECLARE_MESSAGE_MAP() 9r<J"%*Q  
}; x8\?}UnB  
#endif y`5 9A  
Jr!JHC9i  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file oUr66a/[U  
#include "stdafx.h" f4b/NG|  
#include "Capture.h" $q{!5-e  
#include "CaptureDlg.h" Y;Dp3v !  
#include <windowsx.h> qu@~g cE  
#pragma comment(lib,"hook.lib") rjAn@!|:+  
#ifdef _DEBUG T#Z^s~7&I  
#define new DEBUG_NEW o5O#vW2Il&  
#undef THIS_FILE c?*=|}N  
static char THIS_FILE[] = __FILE__; 9dLV96  
#endif KVaiugQ   
#define IDM_SHELL WM_USER+1 [z\$?VJspQ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2'\H\|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); zOIDU  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ^4hO  
class CAboutDlg : public CDialog Xp% v.M  
{ "5!oi]@>(  
 public: uc\Kg1{  
  CAboutDlg(); e@ 07  
  // Dialog Data hJ? O],4J  
  //{{AFX_DATA(CAboutDlg) [`[|l  
  enum { IDD = IDD_ABOUTBOX }; ^_W#+>&--  
  //}}AFX_DATA aEWWP]  
  // ClassWizard generated virtual function overrides 1Z2HUzqh.  
  //{{AFX_VIRTUAL(CAboutDlg) 6=/F$|  
 protected: A#<?4&  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  -p-ZzgQ  
  //}}AFX_VIRTUAL W:nef<WH  
  // Implementation 3m)0z{n  
 protected: >J?fl8  
  //{{AFX_MSG(CAboutDlg) l0 m-$/  
  //}}AFX_MSG 6]N;r5n  
  DECLARE_MESSAGE_MAP() /NFj(+&g+  
}; QXFo1m  
1{. |+S Z!  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) `?@}>.  
{ u@M,qo`  
 //{{AFX_DATA_INIT(CAboutDlg) ]Sz:|%JP1  
 //}}AFX_DATA_INIT ~&{S<Wl  
} <w9JRpFY  
lh7#t#  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ?4&e;83_#y  
{ vWv"  
 CDialog::DoDataExchange(pDX); rfJz8uF%  
 //{{AFX_DATA_MAP(CAboutDlg) $6 9&O  
 //}}AFX_DATA_MAP ,Vm < rK  
} hH 3RP{'=  
h"Q8b}$^)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) b3[!V{|  
 //{{AFX_MSG_MAP(CAboutDlg) !hy-L_wL]  
 // No message handlers q!7ANib6O  
 //}}AFX_MSG_MAP ]|a g  
END_MESSAGE_MAP() ,PW'#U:  
i)#dWFDTv  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) P>D)7 V9Hh  
: CDialog(CCaptureDlg::IDD, pParent) Pn1^NUMZJ  
{ #A/  
 //{{AFX_DATA_INIT(CCaptureDlg)  'KL0@l  
  m_bControl = FALSE; o[w:1q7  
  m_bAlt = FALSE; ]p GL`ge5  
  m_bShift = FALSE; CwzZ8.o$i  
  m_Path = _T("c:\\"); LL|r A:  
  m_Number = _T("0 picture captured."); ie95rZp  
  nCount=0; iHf$  
  bRegistered=FALSE; P|E| $)m  
  bTray=FALSE;  8q!]y6  
 //}}AFX_DATA_INIT 1(R}tRR7R  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 f~R(D0@  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /-'}q=M  
} %)1?TU  
7Q9 w?y~c  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) [ l??A3G  
{ 9;u@q%;!k  
 CDialog::DoDataExchange(pDX); &PHTpkaam  
 //{{AFX_DATA_MAP(CCaptureDlg) Bm<`n;m  
  DDX_Control(pDX, IDC_KEY, m_Key); ltSU fI  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ,w4(kcg%iQ  
  DDX_Check(pDX, IDC_ALT, m_bAlt); : *#-%0  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); o5PO =AN  
  DDX_Text(pDX, IDC_PATH, m_Path); rXP,\ ]r+  
  DDX_Text(pDX, IDC_NUMBER, m_Number); AV]2 euyn  
 //}}AFX_DATA_MAP my1@41 H  
} J yK3{wYS  
3;9^  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) WE#^a6  
//{{AFX_MSG_MAP(CCaptureDlg) 4F:\-O  
 ON_WM_SYSCOMMAND() f'RX6$}\1X  
 ON_WM_PAINT() eM6<%?b  
 ON_WM_QUERYDRAGICON() SKN`2hD  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) u c)eil  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) [|$h*YK  
 ON_BN_CLICKED(ID_CHANGE, OnChange) VCkq"f7c w  
//}}AFX_MSG_MAP O=t_yy  
END_MESSAGE_MAP() Ll't>)  
qInR1r<  
BOOL CCaptureDlg::OnInitDialog() 9W5lSX#^;  
{ *N<]Xy @  
 CDialog::OnInitDialog(); eo?bL$A[s  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ;igIZ$&  
 ASSERT(IDM_ABOUTBOX < 0xF000); c)85=T6*aA  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ^{`exCwM x  
 if (pSysMenu != NULL) q.bSIV|  
 { 'H>^2C iM  
  CString strAboutMenu; 5C ]x!>kX  
  strAboutMenu.LoadString(IDS_ABOUTBOX); $a]`nLUa  
  if (!strAboutMenu.IsEmpty()) 2F.;;Ab  
  { ADzhNf S  
   pSysMenu->AppendMenu(MF_SEPARATOR); 'IQ0{&EI  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ]%H`_8<gc  
  } q54]1TQ  
 } tDcT%D {:  
 SetIcon(m_hIcon, TRUE); // Set big icon q<|AZ2Ai  
 SetIcon(m_hIcon, FALSE); // Set small icon h438`  
 m_Key.SetCurSel(0);  mq.`X:e  
 RegisterHotkey(); C< tl/NC  
 CMenu* pMenu=GetSystemMenu(FALSE); dZ@63a>>@  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); p]TAELy  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 2%m BK  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2/^3WY1U  
 return TRUE; // return TRUE unless you set the focus to a control </z Eg3F\  
} C,r;VyW6BI  
*i%d,w0+  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ~36!?&eA8  
{ g3y~bf  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) @": ^)87  
 { tyFzSrfc  
  CAboutDlg dlgAbout; 8GUX{K  
  dlgAbout.DoModal(); C1)!f j=  
 } k y7Gwc  
 else 1))8 A@,  
 { oG\Vxg*  
  CDialog::OnSysCommand(nID, lParam); SqpaFWr  
 }  =:pJ  
} 8nV+e~-w  
bY:x8fl  
void CCaptureDlg::OnPaint() XRi8Gpg  
{ Q1 97mN+0  
 if (IsIconic()) 73;GW4,  
 { CD~.z7,LC  
  CPaintDC dc(this); // device context for painting Xx:"4l.w.  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); L="}E rmK  
  // Center icon in client rectangle DTL.Bsc-.  
  int cxIcon = GetSystemMetrics(SM_CXICON); PJH&  
  int cyIcon = GetSystemMetrics(SM_CYICON); rV#ch(  
  CRect rect; gM:".Ee  
  GetClientRect(&rect); q2E_ A  
  int x = (rect.Width() - cxIcon + 1) / 2; f ;n3&e0eC  
  int y = (rect.Height() - cyIcon + 1) / 2; Fx.=#bVX7  
  // Draw the icon Dp9+HA9t  
  dc.DrawIcon(x, y, m_hIcon); (!WD1w   
 } nNn :-  
 else kffcm/  
 { ~]2K ^bh8&  
  CDialog::OnPaint(); 5rik7a)Z]  
 } ?e 4/p  
} 5\ nAeP  
F)eelPZ+,  
HCURSOR CCaptureDlg::OnQueryDragIcon() ~4'$yWG  
{ a:w#s}bL  
 return (HCURSOR) m_hIcon; j#ab_3xH  
} ^1];S^nD  
G 3ptx! D  
void CCaptureDlg::OnCancel() @ j/a=4o[  
{ <LiPEo.R  
 if(bTray) #ABZ&Z  
  DeleteIcon();  @q) d  
  CDialog::OnCancel(); P&Vv/D  
} j8sH|{H!Nq  
8":Q)9;%  
void CCaptureDlg::OnAbout() O=7CMbS3  
{ K}Qa~_  
 CAboutDlg dlg; S f# R0SA  
 dlg.DoModal(); <a3 WKw  
} "w<#^d_6  
K[YyBE id  
void CCaptureDlg::OnBrowse() 8quaXVj^a  
{ Z% UP6%  
 CString str; 8}:nGK|kx  
 BROWSEINFO bi; CqC`8fD1  
 char name[MAX_PATH]; 9\(| D#  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); @6-jgw>W2  
 bi.hwndOwner=GetSafeHwnd(); )^hbsMhO  
 bi.pszDisplayName=name; #RLt^$!H  
 bi.lpszTitle="Select folder"; X:{!n({r=  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; K|=A:  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); I&5!=kR  
 if(idl==NULL) m1AJ{cs  
  return; {)<v&'*c~  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Ow,b^|  
 str.ReleaseBuffer(); *o ix6  
 m_Path=str; HZZn'u  
 if(str.GetAt(str.GetLength()-1)!='\\') w0unS`\4  
  m_Path+="\\"; r3?o9D>  
 UpdateData(FALSE); YS_; OFsd  
} dPRra{  
>9J:Uo1z  
void CCaptureDlg::SaveBmp() Tlr v={  
{ Xch~ 1K  
 CDC dc; .=; ;  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); )V9bI(v  
 CBitmap bm; lp8v0e4  
 int Width=GetSystemMetrics(SM_CXSCREEN); dj%!I:Q>u  
 int Height=GetSystemMetrics(SM_CYSCREEN); <1!O1ab  
 bm.CreateCompatibleBitmap(&dc,Width,Height); #g!.T g'  
 CDC tdc; alb.g>LNPP  
 tdc.CreateCompatibleDC(&dc); TA~{1_l  
 CBitmap*pOld=tdc.SelectObject(&bm); `Q,H|hp;k;  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); X}0cCdW  
 tdc.SelectObject(pOld); k9F=8q  
 BITMAP btm; wy2 D;;  
 bm.GetBitmap(&btm); Eh4= ZEX  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ?aMOZn?  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 69.NPy@  
 BITMAPINFOHEADER bih; TD_Oo-+\  
 bih.biBitCount=btm.bmBitsPixel; *Pg2c(Vg  
 bih.biClrImportant=0; ySI !d|_  
 bih.biClrUsed=0; g9F?z2^  
 bih.biCompression=0; bg0Wnl  
 bih.biHeight=btm.bmHeight; poFg 1  
 bih.biPlanes=1; ybUaTD@?}b  
 bih.biSize=sizeof(BITMAPINFOHEADER); 4B][S'f  
 bih.biSizeImage=size; P!k{u^$L  
 bih.biWidth=btm.bmWidth; |ENh)M8}r  
 bih.biXPelsPerMeter=0; Xn ;AZu^'R  
 bih.biYPelsPerMeter=0; >(RkZ}z  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); jc9y<{~x/  
 static int filecount=0; 6W Ur QFK  
 CString name; xkA K!uVy  
 name.Format("pict%04d.bmp",filecount++); $ME)#(  
 name=m_Path+name; !|>"o7  
 BITMAPFILEHEADER bfh; >LuYHr  
 bfh.bfReserved1=bfh.bfReserved2=0; #_lDss  
 bfh.bfType=((WORD)('M'<< 8)|'B'); I2Yz#V<%ru  
 bfh.bfSize=54+size; Z/J y'$x  
 bfh.bfOffBits=54; yV(\R  
 CFile bf; ?bu>r=oIO]  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ nQS|Lt_+  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); L/^I*p,  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); HpnWo DM  
  bf.WriteHuge(lpData,size); 8~gLqh8^V  
  bf.Close(); GPkpXVm  
  nCount++; 40 0#v|b  
 } cN9t{.m  
 GlobalFreePtr(lpData); <0?W{3NqI  
 if(nCount==1) DlNX 3  
  m_Number.Format("%d picture captured.",nCount); igAtRX%Qx  
 else _J[P[(ab  
  m_Number.Format("%d pictures captured.",nCount); xkR0  
  UpdateData(FALSE); GuL<Z1<c  
} RpYERAgT  
cCc( fF*^  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) )\^-2[;  
{ $, '*f?d  
 if(pMsg -> message == WM_KEYDOWN) \uMLY<]P  
 { *uvQ\.  
  if(pMsg -> wParam == VK_ESCAPE) )sp+8  
   return TRUE; FC"8#*x  
  if(pMsg -> wParam == VK_RETURN) 7=, ;h  
   return TRUE; N17RLz *\  
 } & ZB  
 return CDialog::PreTranslateMessage(pMsg); E1f\%!2l  
} ;jTN | i'  
7"xd1l?zz  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6S\8$  
{ Y[S1$(K&*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >@AB<$ A  
  SaveBmp(); RCLeA=/N@0  
  return FALSE; C{wEzM :  
} M& CqSd  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 4ss4kp_>  
 CMenu pop; wH6aAV~1  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); A. w:h;7  
 CMenu*pMenu=pop.GetSubMenu(0); vVcob }ZH  
 pMenu->SetDefaultItem(ID_EXITICON); ei5~&  
 CPoint pt; n?K  
 GetCursorPos(&pt); ^/=KK:n~  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); k-""_WJ~^  
 if(id==ID_EXITICON) Pr,q*_Yy  
  DeleteIcon(); *HB-QIl  
 else if(id==ID_EXIT) /,Jqmm#s^  
  OnCancel(); R_xRp&5  
 return FALSE; /|#fejPh  
} t);/'3|  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Vs{|xG7W D  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) e(8Ba X _  
 AddIcon(); /JU.?M35  
 return res; IdxzE_@  
} w)jISu;RG  
G<;*SYAb  
void CCaptureDlg::AddIcon() S>; 5[l 4  
{ 9 JK Ew  
 NOTIFYICONDATA data; bK-N:8Z  
 data.cbSize=sizeof(NOTIFYICONDATA); maR"t+  
 CString tip; cPc</[x[W  
 tip.LoadString(IDS_ICONTIP); _n\GNUA  
 data.hIcon=GetIcon(0); 5QO9Q]I#_\  
 data.hWnd=GetSafeHwnd(); ~.lPEA %%  
 strcpy(data.szTip,tip); -C&P%tt Y  
 data.uCallbackMessage=IDM_SHELL; vgN&K@hJ  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 0'o:#-  
 data.uID=98; w"&n?L  
 Shell_NotifyIcon(NIM_ADD,&data);  1ZB"EQ  
 ShowWindow(SW_HIDE); FN) $0  
 bTray=TRUE; b*Q&CL  
} GNJj=1Lsd  
R_S.tT!  
void CCaptureDlg::DeleteIcon() ]:/Q]n^  
{ mUx+Y]Ep  
 NOTIFYICONDATA data; 63x?MY6  
 data.cbSize=sizeof(NOTIFYICONDATA); t5IEQ2  
 data.hWnd=GetSafeHwnd(); iMRwp+$  
 data.uID=98; Ok\7y-w^  
 Shell_NotifyIcon(NIM_DELETE,&data); njA#@fU  
 ShowWindow(SW_SHOW); Nu~lsWyRI5  
 SetForegroundWindow(); T37XBg H  
 ShowWindow(SW_SHOWNORMAL); %BB%pC  
 bTray=FALSE; ^D-/`d  
} }f7j 8py  
|)/aGZ+  
void CCaptureDlg::OnChange() z,%$+)K  
{ 2SR:FUV/  
 RegisterHotkey(); t#eTV@-  
} Hl |z</*+  
3%=~) 7cF  
BOOL CCaptureDlg::RegisterHotkey() zT?D<XW>1  
{ DrK{}uM  
 UpdateData(); y Fq&8 x<X  
 UCHAR mask=0; ;@E$}*3[>V  
 UCHAR key=0; LvYB7<zk>  
 if(m_bControl) 0%I=d  
  mask|=4; dzrio-QU~  
 if(m_bAlt) x.R4% Z  
  mask|=2; K8Y=S12Ti  
 if(m_bShift) jdJ>9O0A,  
  mask|=1; gjzuG< 7m  
  key=Key_Table[m_Key.GetCurSel()]; qK&d]6H R  
 if(bRegistered){ Uq`'}Vo  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); |*tp16+6  
  bRegistered=FALSE; {h`uV/5@`  
 } Vj>8a)"B5a  
 cMask=mask; 1|-Dj|  
 cKey=key; by/jYg)+  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "wh , Ue  
 return bRegistered; XACm[NY_  
} -_eLf#3  
TT3|/zwn  
  四、小结 p0<\G  
/J6rv((  
  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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