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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: {f&NStiB  
  9E^~#j@Zr  
  一、实现方法 {vLTeIxf.G  
rv`2*B  
  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: Tt`L(oF  
H/pcX j  
#pragma data_seg("shareddata") 6hLNJ  
HHOOK hHook =NULL; //钩子句柄 )>?! xx_`  
UINT nHookCount =0; //挂接的程序数目 -`Da`ml  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 d b<q-u  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 J &{qppN  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey >H)^6sJ;%b  
static int KeyCount =0; {zY`h6d  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 @T5YsX]qb7  
#pragma data_seg() sE-x"c  
8g.AT@ ,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。 9^(HXH_f  
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  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: //~POm  
9jqO/_7R+  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 6aRGG+H  
cKey,UCHAR cMask) fVG$8tB  
{ y#&$ f  
 BOOL bAdded=FALSE;  xQX<w\s  
 for(int index=0;index<MAX_KEY;index++){ +O&RBEa[  
  if(hCallWnd[index]==0){ l_bL,-|E8  
   hCallWnd[index]=hWnd; i^/ eN  
   HotKey[index]=cKey; L7s>su|c(  
   HotKeyMask[index]=cMask; tF<^9stM  
   bAdded=TRUE; #"hJpyW 4V  
   KeyCount++; 7[4_+Q:}  
   break; LjSLg[i  
  } )\0Ug7]?  
 } {ms,q_Zr  
 return bAdded; @k_Jl>X  
} ht2 f-EKf{  
//删除热键 Xg,0/P~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) U?JiVxE^  
{ n?zbUA#  
 BOOL bRemoved=FALSE; $Z,i|K;  
 for(int index=0;index<MAX_KEY;index++){ 3fm;r5  
  if(hCallWnd[index]==hWnd){ x(rd$oZO  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ aB=vu=hF  
    hCallWnd[index]=NULL; iJ,M-GHK  
    HotKey[index]=0; YR?3 61FK  
    HotKeyMask[index]=0; $K+4C0wX`  
    bRemoved=TRUE; h U 9\y  
    KeyCount--; N 9c8c  
    break; Q^*G`&w,  
   } *^X#Eb  
  } d&NCFx  
 } P4hZB_.=  
 return bRemoved; fL(':W&n-  
} 5ze`IY  
P{"  WlJ  
0[V&8\S~'T  
  DLL中的钩子函数如下: &7$,<9.  
D/gd  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) g&{gD^9)4  
{ )?F $-~7  
 BOOL bProcessed=FALSE; 8$2l^  
 if(HC_ACTION==nCode) kX@ bv"i  
 { K~`n}_:  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 UedvA9$&;  
   switch(wParam) /!^L69um  
   {  <Gn8B^~$  
    case VK_MENU: 4kWg>F3  
     MaskBits&=~ALTBIT; A Z4|&iT  
     break; BO?mQu~  
    case VK_CONTROL: ;[FW!  
     MaskBits&=~CTRLBIT; fndK/~?]H  
     break; >Y,/dyT Zm  
    case VK_SHIFT: eFt\D\XOW  
     MaskBits&=~SHIFTBIT; Z[a O_6L  
     break; 8T8pAs0 p  
    default: //judge the key and send message A)hq0FPp  
     break; 8FxcI!A@  
   } z0T`5N G@  
   for(int index=0;index<MAX_KEY;index++){ @PT`CK}  
    if(hCallWnd[index]==NULL) \Pw8wayr%  
     continue; "V*kOb&'*Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8|w5QvCU?3  
    { ZmEG<T05  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (:_%kmu  
     bProcessed=TRUE; ybD{4&ZE  
    } l4iuu  
   } W2}%zux  
  } aEcktg6h  
  else if((lParam&0xc000ffff)==1){ //有键按下 i!CKA}",  
   switch(wParam) &_< VZS  
   { B0-4 ZT  
    case VK_MENU: ."~7 \E> t  
     MaskBits|=ALTBIT; lAdOC5+JX  
     break; t7{L[C$  
    case VK_CONTROL: RnMBGxa  
     MaskBits|=CTRLBIT; DCEvr"(  
     break; ]NaMZ  
    case VK_SHIFT: 2(c<U6#C'l  
     MaskBits|=SHIFTBIT; 4a(g<5wfI  
     break; JK@izI  
    default: //judge the key and send message ?D RFsA  
     break; [ea6dv4p  
   } *]{9K  
   for(int index=0;index<MAX_KEY;index++){ mr:kn0  
    if(hCallWnd[index]==NULL) ^/_\etV  
     continue; s(1_:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }ZEfT]  
    { w o-O_uZB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); PWf{aHsr  
     bProcessed=TRUE; 2x)0?N[$O  
    } ^tm++  
   } >$7wA9YhL  
  } -D!#W%y8  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 xT_fr,P  
   for(int index=0;index<MAX_KEY;index++){ .yctE:n  
    if(hCallWnd[index]==NULL) ^/`#9]<%  
     continue; PphR4 sIM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) j[$B\H  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >uBV  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 |y{; |K  
   } J{nyo1A  
  } Nb^zkg  
 } /3)YWFZZc  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); A2g"=x[1@K  
} }XfS#Xr1aV  
{ED(O -W  
  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: 5]4<!m  
AJ;u&&c4C\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ka?IX9t\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); L Q I: ]d  
xm%[}Dt]  
  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: TEaD-mY3  
-4*'WzWr  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) q|47;bK'  
{ z;fd#N:  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ~pd1 )  
 { bR>o!(M'Z\  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Vu|Br  
  SaveBmp(); -V;0_Nx7p  
  return FALSE; >wg9YZ~8  
 } }@ O|RkY  
 …… //其它处理及默认处理 O84v*=uA  
} GL;x:2XA  
&;6|nl9;  
EzD -1sJ  
  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。 >gX0Ij#G  
nZ`2Z7!  
  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。 %=NM_5a}]  
ooLnJ Y#  
  二、编程步骤 `}k&HRn  
M `9orq<  
  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"; >D`fp  
f_re"d 3u  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 5{R#h :  
? z)y%`}  
  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; e' /  
Z30z<d,j  
  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; $L<_uqSk  
5`{|[J_[  
  5、 添加代码,编译运行程序。 an$ ]IN  
G*vpf~q?  
三、程序代码 #q~3c;ec  
 `5k6s,  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 66^1&D"  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) @n~>j&Kp  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 4i[v ew  
#if _MSC_VER > 1000 &J6o$i  
#pragma once m' Ekp  
#endif // _MSC_VER > 1000 L#7)X5a__  
#ifndef __AFXWIN_H__ [x$eF~Kp  
#error include 'stdafx.h' before including this file for PCH -CU7u=*b  
#endif A]tf>H#1  
#include "resource.h" // main symbols Kh:#S|   
class CHookApp : public CWinApp ;G%wc!  
{ $+lz<~R  
 public: 6yu*a_  
  CHookApp(); )F%wwc^r  
  // Overrides D_yY0rRM  
  // ClassWizard generated virtual function overrides  :kp  
  //{{AFX_VIRTUAL(CHookApp) TzevC$m;z  
 public: fncwe ';?  
  virtual BOOL InitInstance(); |7S4;  
  virtual int ExitInstance(); 7kX7\[zN  
  //}}AFX_VIRTUAL yNLa3mW  
  //{{AFX_MSG(CHookApp) X>6 ~{3  
  // NOTE - the ClassWizard will add and remove member functions here. U<g UX07  
  // DO NOT EDIT what you see in these blocks of generated code ! Ew?/@KAV\  
  //}}AFX_MSG |L.~Am d  
  DECLARE_MESSAGE_MAP() 9h3~;Q  
}; P[#WHbn  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); qOcG|UgF  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 86^ZYh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]df9'\  
BOOL InitHotkey(); j?f,~Y<k  
BOOL UnInit(); p(x1D]#Z[  
#endif ^O$[Y9~*  
+]S;U&vQ  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. /8$1[[[  
#include "stdafx.h" r.a9W? (E  
#include "hook.h" o%4&1^ Vg  
#include <windowsx.h> j;AzkReb  
#ifdef _DEBUG <D;H} ef  
#define new DEBUG_NEW Z0F>"Z _qn  
#undef THIS_FILE TN |{P  
static char THIS_FILE[] = __FILE__; l|ZzG4]+l  
#endif NqQ(X'W7  
#define MAX_KEY 100 Hz3 S^o7  
#define CTRLBIT 0x04 $@u^Jt, ?  
#define ALTBIT 0x02 1VjeP *  
#define SHIFTBIT 0x01 /SqFP L]  
#pragma data_seg("shareddata") -9H!j4]T?  
HHOOK hHook =NULL; DX%8. @  
UINT nHookCount =0; 3Q*RR"3  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey uZ0 $s$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT SRG!G]?-  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey St3(1mApl  
static int KeyCount =0; W kDn  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift tRUsZl  
#pragma data_seg() 6t7;}t]t  
HINSTANCE hins; *nsnX/e(-  
void VerifyWindow(); pZ_FVID  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) LKf5r,C  
//{{AFX_MSG_MAP(CHookApp) !aW*dD61  
// NOTE - the ClassWizard will add and remove mapping macros here. %8} ksl07  
// DO NOT EDIT what you see in these blocks of generated code! Z z; <P  
//}}AFX_MSG_MAP {Jw<<<G  
END_MESSAGE_MAP() W &0@&U  
XJxs4a1[t  
CHookApp::CHookApp() G%p!os\>  
{ G8(i).Q  
 // TODO: add construction code here, d WB8  
 // Place all significant initialization in InitInstance !(ux.T0  
} J%Z)#  
@rK>yPhf  
CHookApp theApp; C>\!'^u1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) qs c-e,rl  
{ Pu%>j'A  
 BOOL bProcessed=FALSE; L1Cn  
 if(HC_ACTION==nCode) +{Jf]"KD  
 { Q 5Ghki  
  if((lParam&0xc0000000)==0xc0000000){// Key up "PX3%II  
   switch(wParam) 9Pob|UA  
   { !iitx U  
    case VK_MENU: EkjK92cF  
     MaskBits&=~ALTBIT; kkE)zF   
     break; $NGtxZp  
    case VK_CONTROL: <0Egkz3s  
     MaskBits&=~CTRLBIT; aji~brq  
     break; Acq>M^E3  
    case VK_SHIFT: ^0ZKHR(}e  
     MaskBits&=~SHIFTBIT; j=jrzG+`  
     break; HyX4ob[X  
    default: //judge the key and send message [;CqvD<S  
     break; :AE;x&  
   } <j8&u/Za~'  
   for(int index=0;index<MAX_KEY;index++){ fkv{\zN  
    if(hCallWnd[index]==NULL) N>6yacTB  
     continue; Q RmQ>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) g*AD$":  
    { SE}RP3dF!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); sO4}kxZ  
     bProcessed=TRUE; ! ?U^+)^$  
    } |b'<XQ&l5  
   } k89gJ5B$  
  } (+Kof  
  else if((lParam&0xc000ffff)==1){ //Key down C"` 'Re5)  
   switch(wParam) NK#"qK""k  
   { %]sEt{  
    case VK_MENU: 8.Own=G?  
     MaskBits|=ALTBIT; :V-}Sde  
     break; zc,9Qfn  
    case VK_CONTROL: %qjyk=z+Z  
     MaskBits|=CTRLBIT; seV;f^-hR  
     break; :qSi>KCGh  
    case VK_SHIFT: )|^<woli,  
     MaskBits|=SHIFTBIT; d>"$^${  
     break; X @jYQ.  
    default: //judge the key and send message K^qUlyv  
     break; \PMKmJ X0O  
   } > %cWTC  
   for(int index=0;index<MAX_KEY;index++) 9@z|2z2\G  
   { }Keon.N?   
    if(hCallWnd[index]==NULL) >RqT7n8h  
     continue; y:[VRLo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ZNC?Ntw  
    { /2\= sTd  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); NF\^'W@N  
     bProcessed=TRUE; UE`4$^qs  
    } M>H^<N}'A  
   } 10I`AjF0  
  } b;;Kxi:7$}  
  if(!bProcessed){ &{4Mo,x  
   for(int index=0;index<MAX_KEY;index++){ }L7F g%,  
    if(hCallWnd[index]==NULL) J'^$|/Q  
     continue; }!7DF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) k$x 'v#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); K\E]X\:  
   } 4C9"Q,o%&  
  } R6@~   
 } *Qwhi&k  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); KRR^?  
} |`;1p@w"  
^sn>p}Tg  
BOOL InitHotkey() "`gZ y)E  
{ %b%<g%@i  
 if(hHook!=NULL){ i~s9Ot  
  nHookCount++; Hkz~9p  
  return TRUE; +xdFkc  
 } ,, #rv-*  
 else `::'UfHc  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 2#A9D.- h  
  if(hHook!=NULL) ,lS-;.  
   nHookCount++; y~ 4nF  
  return (hHook!=NULL); 7(USp#"  
} [ma#8p)  
BOOL UnInit() ,<j5i?  
{ I;.E}k   
 if(nHookCount>1){ )qP{X,Uf  
  nHookCount--; EC!Cv;'  
  return TRUE; k|c0tvp  
 } 7 8inh%  
 BOOL unhooked = UnhookWindowsHookEx(hHook); eh7r'DmAR  
 if(unhooked==TRUE){ nMdN$E  
  nHookCount=0; ^5 =E`q".  
  hHook=NULL; j{-7Pf8A  
 } _3G)S+ 7#  
 return unhooked; +X(^Q@  
} Bsk2&17z  
o^"3C1j  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {)gd|JV*  
{ l3#dfW{  
 BOOL bAdded=FALSE; M9jo<+  
 for(int index=0;index<MAX_KEY;index++){ -/2$P  
  if(hCallWnd[index]==0){ 3b[+m}UWQ  
   hCallWnd[index]=hWnd; D!$ =oK  
   HotKey[index]=cKey; Vyq<T(5  
   HotKeyMask[index]=cMask; ,u^0V"hJ  
   bAdded=TRUE; #|1QA3KzO  
   KeyCount++; =y]b|"s~2  
   break; R9-JjG2v  
  } 8 ]MzOGB8  
 } 18tQWI$  
 return bAdded; A;`U{7IST  
} JG4*B|3  
8+cpNX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ` +UMZc  
{ E0A|+P '?  
 BOOL bRemoved=FALSE; =(5GU<}  
 for(int index=0;index<MAX_KEY;index++){ i[^lJ)[>N  
  if(hCallWnd[index]==hWnd){ =&/a\z!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ p[cL# fBz  
    hCallWnd[index]=NULL; >!F,y3"5S  
    HotKey[index]=0; r<N*N,~  
    HotKeyMask[index]=0; }w^ T9OC  
    bRemoved=TRUE; ZBq*<VtV  
    KeyCount--; s1$#G!'  
    break; Cj9O [  
   } iT9Ex9RL  
  } (Tb0PzA  
 } 9v,8OK)  
 return bRemoved; ]3u'Qv}o  
} T`{MQ:s  
9<c4y4#y  
void VerifyWindow() 3C[4!>|  
{ =/!S  
 for(int i=0;i<MAX_KEY;i++){ NKhR%H  
  if(hCallWnd!=NULL){ (NN14  
   if(!IsWindow(hCallWnd)){ oYErG] ,  
    hCallWnd=NULL; KY&,(z   
    HotKey=0; v+bjC  
    HotKeyMask=0; at]Q4  
    KeyCount--; fQ4$@  
   } }v ,P3  
  } @W- f{V  
 } [E1|jcmQ  
} Z9~Wlt'?  
{ (,vm}iFL  
BOOL CHookApp::InitInstance() ?yeC j1X  
{ EXzNehO~e  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); [4rMUS7-m"  
 hins=AfxGetInstanceHandle(); B4&pBiG&f6  
 InitHotkey(); A8(PI)Ic.  
 return CWinApp::InitInstance(); ^O*hs%eO%  
} e"mfJY  
Ao0PFY  
int CHookApp::ExitInstance() >*xzSd? \  
{ %,D%Q~  
 VerifyWindow(); vqZM89 xY  
 UnInit(); v 8a  
 return CWinApp::ExitInstance(); wh+ibH}@!  
} "0)G|pZI  
rqJj!{<B  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file .cog9H'  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) X&X')hzIt  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ' qS!n  
#if _MSC_VER > 1000 ~kT{O!x}4  
#pragma once @?? 6)C  
#endif // _MSC_VER > 1000 O G}&%NgH  
Y @&nW  
class CCaptureDlg : public CDialog 7Apbi}")  
{ "T=LHjE  
 // Construction UF&Wgj [  
 public: R)Fl@ Tn  
  BOOL bTray; :''0z  
  BOOL bRegistered; K L~sEli  
  BOOL RegisterHotkey(); Kp;o?5H  
  UCHAR cKey; s>I}-=.(Q  
  UCHAR cMask; HbVm O]#$D  
  void DeleteIcon(); OXV@LYP@  
  void AddIcon(); ;0q6 bp(<H  
  UINT nCount; rdg1<Z  
  void SaveBmp(); -~ Q3T9+  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor t}l<#X5  
  // Dialog Data tRCd(Z,WY  
  //{{AFX_DATA(CCaptureDlg) 3l[hkRFu`  
  enum { IDD = IDD_CAPTURE_DIALOG }; IxR:a(  
  CComboBox m_Key; LnX^*;P5t  
  BOOL m_bControl; -;z\BW5 y  
  BOOL m_bAlt; T/5U lW|\  
  BOOL m_bShift; U6PUt'Kk@  
  CString m_Path; kICYPy  
  CString m_Number; S3cQC`^  
  //}}AFX_DATA ~zRd||qv  
  // ClassWizard generated virtual function overrides {qyo#  
  //{{AFX_VIRTUAL(CCaptureDlg) 8!Kfe  
 public: N6'Y N10  
  virtual BOOL PreTranslateMessage(MSG* pMsg); uGWk(qn  
 protected: =&GV\ju  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support i+3b)xtW7  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 3I(H.u  
  //}}AFX_VIRTUAL  sOmYQ{R  
  // Implementation xw Qkk  
 protected: ~'iuh>O)  
  HICON m_hIcon; HjD= .Q  
  // Generated message map functions $y}Tbm  
  //{{AFX_MSG(CCaptureDlg) &LYZQ?|  
  virtual BOOL OnInitDialog(); g'E^@1{  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); h,G$e|[?  
  afx_msg void OnPaint(); IYN`q'%|  
  afx_msg HCURSOR OnQueryDragIcon(); "&F/'';0}E  
  virtual void OnCancel(); Y7HWf  
  afx_msg void OnAbout(); kfV}w,  
  afx_msg void OnBrowse(); N@S;{uK  
  afx_msg void OnChange(); )\^OI:E  
 //}}AFX_MSG 7lu;lAAP  
 DECLARE_MESSAGE_MAP() H;`@SJBf  
}; VF.S)='>Eu  
#endif 2=RDAipf59  
Jo]g{GX[  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file u5[Wr:  
#include "stdafx.h" ERplDSfO-  
#include "Capture.h" \W!<xE  
#include "CaptureDlg.h" 5T`39[Fya  
#include <windowsx.h> 9'M({/7y  
#pragma comment(lib,"hook.lib") qm@hD>W+  
#ifdef _DEBUG ` (<>`  
#define new DEBUG_NEW d"a`?+(Q  
#undef THIS_FILE &#.&xc2sRZ  
static char THIS_FILE[] = __FILE__; j!pxG5%  
#endif T^W8_rm *3  
#define IDM_SHELL WM_USER+1 &bb*~W-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); on|>"F`pb  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); de[_T%A  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; #=rI[KI  
class CAboutDlg : public CDialog @*dA<N.9  
{ FS[CUoA  
 public: kJ >B)  
  CAboutDlg(); Y&?]t  
  // Dialog Data DlP=R  
  //{{AFX_DATA(CAboutDlg) zi'?FM[f)  
  enum { IDD = IDD_ABOUTBOX }; xk9]jQ7  
  //}}AFX_DATA URwFNOM2  
  // ClassWizard generated virtual function overrides Im =E?t  
  //{{AFX_VIRTUAL(CAboutDlg) &Jz%L^  
 protected: Q_S fFsY  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3? "GH1e  
  //}}AFX_VIRTUAL oc.x1<Nd  
  // Implementation (RF6K6~  
 protected: ;(A'XA4 6N  
  //{{AFX_MSG(CAboutDlg) 4e4$AB"  
  //}}AFX_MSG $!t!=  
  DECLARE_MESSAGE_MAP() KT}}=st%  
}; X |as1Y$O+  
BScysoeD  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 1'=brc YR  
{ %3cBh v[q4  
 //{{AFX_DATA_INIT(CAboutDlg) gi8kYHldH  
 //}}AFX_DATA_INIT }-kb"\X%g  
} x<].mx  
SVJ3!1B,  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) *|cvx:GO  
{ p n)5neX{  
 CDialog::DoDataExchange(pDX); Sc(2c.HO*  
 //{{AFX_DATA_MAP(CAboutDlg) u:k#1Nn!  
 //}}AFX_DATA_MAP Ty5\zxC|  
} K>-m8.~\E  
7~ 2X/  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) &c'unKH  
 //{{AFX_MSG_MAP(CAboutDlg) -$*YN{D+  
 // No message handlers }x+{=%~N  
 //}}AFX_MSG_MAP &Jj ?C  
END_MESSAGE_MAP() CUoMB r  
nt7ui*k  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) _-^@Jx[  
: CDialog(CCaptureDlg::IDD, pParent) {.sF&(e   
{ zOcMc{w0   
 //{{AFX_DATA_INIT(CCaptureDlg) /bVI'fT  
  m_bControl = FALSE; }'3V(;9  
  m_bAlt = FALSE; WZ ZD  
  m_bShift = FALSE; 2>mDT  
  m_Path = _T("c:\\"); = hpX2/]  
  m_Number = _T("0 picture captured."); +`ZcYLg)#  
  nCount=0; xH0Bk<`V:  
  bRegistered=FALSE; tcs Z! #  
  bTray=FALSE; YEGXhn5E  
 //}}AFX_DATA_INIT BZE19!  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 OLv(  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); edm&,ph]  
} =,sMOJ c>  
{It4=I)M  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 9yQ[*  
{ b"J(u|Du`  
 CDialog::DoDataExchange(pDX); FQ[::*-  
 //{{AFX_DATA_MAP(CCaptureDlg) Z0x N9S  
  DDX_Control(pDX, IDC_KEY, m_Key); :f `1  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); *l|CrUa  
  DDX_Check(pDX, IDC_ALT, m_bAlt); BPW:W }  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); g{&ux k);  
  DDX_Text(pDX, IDC_PATH, m_Path); OUD<+i,  
  DDX_Text(pDX, IDC_NUMBER, m_Number); U*zjEY:A  
 //}}AFX_DATA_MAP h><;TAp  
} '&\km~&  
-.xs=NwB.|  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) {8E hC/=  
//{{AFX_MSG_MAP(CCaptureDlg) t &*$@0A  
 ON_WM_SYSCOMMAND() 4bmpMF-  
 ON_WM_PAINT() O,7P6  
 ON_WM_QUERYDRAGICON() #<)u%)`  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) EF}Z+7A  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) X)Kd'6zg  
 ON_BN_CLICKED(ID_CHANGE, OnChange) -~jM=f$  
//}}AFX_MSG_MAP e-Eoe_k  
END_MESSAGE_MAP() . a~J.0co  
sLCL\dWT  
BOOL CCaptureDlg::OnInitDialog() D:%v((Ccw  
{ (fq>P1-  
 CDialog::OnInitDialog(); zd+8fP/UB  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); W8\K_M}  
 ASSERT(IDM_ABOUTBOX < 0xF000); z[vMO%  
 CMenu* pSysMenu = GetSystemMenu(FALSE); (CEJg|,  
 if (pSysMenu != NULL) I'C{=?  
 { ybfNG@N*  
  CString strAboutMenu; &B[$l`1  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?QZ\KY  
  if (!strAboutMenu.IsEmpty()) BK,= (;d3  
  { Y6V56pOS  
   pSysMenu->AppendMenu(MF_SEPARATOR); 2@=JIMtc  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); I#m5Tl|#  
  } .HMO7n6)8l  
 } H!,#Z7s  
 SetIcon(m_hIcon, TRUE); // Set big icon m"`&FA  
 SetIcon(m_hIcon, FALSE); // Set small icon #lNi\Lw+j  
 m_Key.SetCurSel(0); ppS,9e-  
 RegisterHotkey(); Riw#+#r]/  
 CMenu* pMenu=GetSystemMenu(FALSE); o XA*K.X<  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); U$qSMkj6RK  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); P#6y  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 0F)Y[{h<  
 return TRUE; // return TRUE unless you set the focus to a control \9!W^i[+  
} ;g*ab  
S.BM/M  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 1S<V,9(  
{ 8LB+}N(8f  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) |eJ4"OPC  
 { M&xfQNE   
  CAboutDlg dlgAbout; m>~%. (/x  
  dlgAbout.DoModal(); cs,%Zk.xjw  
 } F+|zCEc  
 else CpO!xj +  
 { uEH&]M>d_  
  CDialog::OnSysCommand(nID, lParam); Rm{S,  
 } EG2NE,,r  
} eQNo'cz  
)9,9yd~SI  
void CCaptureDlg::OnPaint() eXUXoK=T  
{ j $a,93P5  
 if (IsIconic()) Ar N*9  
 { "^yTH/m  
  CPaintDC dc(this); // device context for painting g*TAaUs|n  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 6;k#|-GU&  
  // Center icon in client rectangle $s$z"<  
  int cxIcon = GetSystemMetrics(SM_CXICON); hC=9%u{r?  
  int cyIcon = GetSystemMetrics(SM_CYICON); V07e29w  
  CRect rect; BJ wPSKL  
  GetClientRect(&rect); t=Tu-2,k  
  int x = (rect.Width() - cxIcon + 1) / 2; 6*le(^y`  
  int y = (rect.Height() - cyIcon + 1) / 2; )k{zRq:d  
  // Draw the icon S8^W)XgC;  
  dc.DrawIcon(x, y, m_hIcon); D^$Nn*i;U  
 } T dlF~ca|  
 else Oe5=2~4O  
 { 1@im+R?a  
  CDialog::OnPaint(); Pl9/1YhD/  
 } '/G.^Zl9  
} wz<YflF  
+ v{<<  
HCURSOR CCaptureDlg::OnQueryDragIcon() @;!s"!~sv  
{ "JT R5;`w  
 return (HCURSOR) m_hIcon; ggIz) </  
} uAwT)km {  
);'8*e'  
void CCaptureDlg::OnCancel() C A VqjT7  
{ iZ yhj%#  
 if(bTray) LcI,Dy|P  
  DeleteIcon(); 76(-!Z@=J  
  CDialog::OnCancel(); TU&gj1  
} R&PQU/t)  
4Bsx[~ u&  
void CCaptureDlg::OnAbout() 8xW_N"P.>  
{ Tl6%z9rY@  
 CAboutDlg dlg; !c(B c^  
 dlg.DoModal(); h/W@R_Y  
} wz3BtCx  
Ox#%Dm2  
void CCaptureDlg::OnBrowse() ^&>(_I\w.6  
{ UEbRg =6  
 CString str; RBd{1on  
 BROWSEINFO bi; 6lpfk&  
 char name[MAX_PATH]; ;9MsV.n  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); OQIQ   
 bi.hwndOwner=GetSafeHwnd(); bsO78a~=P  
 bi.pszDisplayName=name; Ii_X^)IL(  
 bi.lpszTitle="Select folder"; fH-V!QYGF  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; TL lR"L5  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi);  A M8bem~  
 if(idl==NULL) rZm|7A)i  
  return; h(*!s`1  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); { AdPC?R`  
 str.ReleaseBuffer(); gpB3\  
 m_Path=str; Q&S\?cKe  
 if(str.GetAt(str.GetLength()-1)!='\\') $y S7u  
  m_Path+="\\"; R s_bM@  
 UpdateData(FALSE); ]~iOO %&R  
} 481J=8H  
q{?Po;\D  
void CCaptureDlg::SaveBmp() Z<T%:F  
{ Ke@zS9  
 CDC dc; #Y6'Q8g f  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); #0V$KC*>  
 CBitmap bm; cPZD#";f  
 int Width=GetSystemMetrics(SM_CXSCREEN); Rrm k\7/  
 int Height=GetSystemMetrics(SM_CYSCREEN); $)t ]av  
 bm.CreateCompatibleBitmap(&dc,Width,Height); {p@uH<)  
 CDC tdc; ve;#o<  
 tdc.CreateCompatibleDC(&dc); a/Z >-   
 CBitmap*pOld=tdc.SelectObject(&bm); }c?/-ab>  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); q'{LTg0kk  
 tdc.SelectObject(pOld); 3eX;T +|o  
 BITMAP btm; |7KW'=O  
 bm.GetBitmap(&btm); PZmg7N  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; /2Q@M>  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Vw0cf;  
 BITMAPINFOHEADER bih; u?6L.^Op  
 bih.biBitCount=btm.bmBitsPixel; gx~79;6  
 bih.biClrImportant=0; /ZlPEs)  
 bih.biClrUsed=0; hDTiXc  
 bih.biCompression=0; :d\ne  
 bih.biHeight=btm.bmHeight; 7)aitDD  
 bih.biPlanes=1; X;25G  
 bih.biSize=sizeof(BITMAPINFOHEADER); MM8@0t'E  
 bih.biSizeImage=size; #/!fLU@  
 bih.biWidth=btm.bmWidth; !.9pV.~  
 bih.biXPelsPerMeter=0; }#va#Nb(,  
 bih.biYPelsPerMeter=0; #-?C{$2I  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 0]%0wbY1  
 static int filecount=0; {YnR]|0&  
 CString name; n%GlO KC  
 name.Format("pict%04d.bmp",filecount++); PEqO<a1Z8  
 name=m_Path+name; ~$xLR/{y  
 BITMAPFILEHEADER bfh; G Xx7/X  
 bfh.bfReserved1=bfh.bfReserved2=0; )* 5R/oy,  
 bfh.bfType=((WORD)('M'<< 8)|'B'); g#b[-)Qx  
 bfh.bfSize=54+size; r:Uqtqxh  
 bfh.bfOffBits=54; [gI;;GW  
 CFile bf; ClZ:#uMbN  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ owHV&(Go(B  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); k1Cx~Q)XC  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); xdw"JS}  
  bf.WriteHuge(lpData,size); k=">2!O/  
  bf.Close(); 6M^P]l  
  nCount++; baJ(Iy$XT  
 } T;!7GW4E ?  
 GlobalFreePtr(lpData); pt[H5  
 if(nCount==1) >; a_i>[  
  m_Number.Format("%d picture captured.",nCount); =xz Dpn>f  
 else z/09~Hc  
  m_Number.Format("%d pictures captured.",nCount); oj\av~cI  
  UpdateData(FALSE); c|?0iN  
} v[4A_WjT  
$ qOV#,@  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) IoUQ~JviA  
{ 6b& <5,=d:  
 if(pMsg -> message == WM_KEYDOWN) wXdtY  
 { Hjl{M>z  
  if(pMsg -> wParam == VK_ESCAPE) {@j0?s  
   return TRUE; N0A PX4j  
  if(pMsg -> wParam == VK_RETURN) 1NJ,If]  
   return TRUE; [4Tiukk(  
 } 022nn-~  
 return CDialog::PreTranslateMessage(pMsg); mY[s2t  
} `-qRZh@E  
ACQbw)tiv}  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) OT-!n  
{ m=;0NLs4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Mle@.IIT  
  SaveBmp(); Z(g9rz']0  
  return FALSE; FnkB z5D  
} 2(SK}<X  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ MR8\'0]  
 CMenu pop; z@@w?>*  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Lbb{z  
 CMenu*pMenu=pop.GetSubMenu(0); /B>p.%M[&  
 pMenu->SetDefaultItem(ID_EXITICON); 8$Igo$U-  
 CPoint pt; FCO5SX#-g  
 GetCursorPos(&pt); 7+^9"k7  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); F<SCW+>z2a  
 if(id==ID_EXITICON) ma4Pmk  
  DeleteIcon(); Om #m":  
 else if(id==ID_EXIT) 5:[<pY!s#  
  OnCancel(); ^@W98_bd;  
 return FALSE; *5KV DOd  
} }*vUOQQp*  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); |0!oSNJ  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 7)Zk:53]  
 AddIcon(); /58]{MfrJ  
 return res; q:Lw!'Z h  
} N^i<A2'6S;  
}~gBnq_DDU  
void CCaptureDlg::AddIcon() )Rhy^<xH  
{ E+XpgR5  
 NOTIFYICONDATA data; 8)I,WWj  
 data.cbSize=sizeof(NOTIFYICONDATA); UuDT=_1Sh  
 CString tip; m(Hb! RT  
 tip.LoadString(IDS_ICONTIP); ( `V  
 data.hIcon=GetIcon(0); f n]rMH4>  
 data.hWnd=GetSafeHwnd(); kaSi sjd  
 strcpy(data.szTip,tip); "&jWC  
 data.uCallbackMessage=IDM_SHELL; ;qM I3wF  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; InI^,&<  
 data.uID=98; WH`E=p^x4  
 Shell_NotifyIcon(NIM_ADD,&data); pUs:r0B  
 ShowWindow(SW_HIDE); {a>a?fVU  
 bTray=TRUE; (dSf>p r2  
} H8^U!"~E  
IYtM'!u  
void CCaptureDlg::DeleteIcon() ^A9D;e6!-  
{ ?$ rSbw  
 NOTIFYICONDATA data; z'cK,psq(  
 data.cbSize=sizeof(NOTIFYICONDATA); I'"b3]DXG  
 data.hWnd=GetSafeHwnd(); ]-  
 data.uID=98; ce/Z[B+d  
 Shell_NotifyIcon(NIM_DELETE,&data); f-at@C1L%L  
 ShowWindow(SW_SHOW); %onUCN<O`  
 SetForegroundWindow(); g? 7%  
 ShowWindow(SW_SHOWNORMAL); 7MX nt5qUh  
 bTray=FALSE; AiUICf?{  
} ( e> .hfrs  
WJH)>4M#  
void CCaptureDlg::OnChange() ;Od;q]G7L  
{ a3o4> 9  
 RegisterHotkey(); hg8gB8Xq  
} t\[aU\4-7  
uXxc2}  
BOOL CCaptureDlg::RegisterHotkey() ^G5BD_  
{ }lN@J,q  
 UpdateData(); 5k&tRg  
 UCHAR mask=0; +APf[ZpU  
 UCHAR key=0; I]S8:w![  
 if(m_bControl) [3Qu @;"&  
  mask|=4; mDn*v( f  
 if(m_bAlt) R-v99e iN  
  mask|=2; ^:JZ.r  
 if(m_bShift) F"7dN*7  
  mask|=1; eURy]  
  key=Key_Table[m_Key.GetCurSel()]; ]k2Jf}|  
 if(bRegistered){ hdFIriE3  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); L2v j)(  
  bRegistered=FALSE; d,"?tip/SX  
 } \Qp #utC0s  
 cMask=mask; *0 y|0J+ 0  
 cKey=key; JXR_klx  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); g.CUo:c  
 return bRegistered; C)2Waj}  
} JaC =\\B  
:5/P{Co (  
  四、小结 k!/"J ;  
zbL!q_wO  
  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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