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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: \cf'Hj}  
  +zXcTT[V  
  一、实现方法 IVa6?f6H_  
t<j_` %`8  
  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: L}'^FqO[IW  
P]OUzI,  
#pragma data_seg("shareddata") KXpbee  
HHOOK hHook =NULL; //钩子句柄 o,S(;6pDJ  
UINT nHookCount =0; //挂接的程序数目 $My~sN8  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 t*dq*(3"c  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 a7=lZZ?  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey rQJ\Y3.  
static int KeyCount =0; f0R+Mz8{  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 V-E 77u6{0  
#pragma data_seg() S <-5<Pg  
9}L2$^#,NA  
  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。 jc\y{I\  
/5Vv5d/Z4!  
  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: Z@%A(nZ_  
C\OZs%]At  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 9XhH*tBn7(  
cKey,UCHAR cMask) V DZOJM)(  
{ 2+b}FVOe\  
 BOOL bAdded=FALSE; 8EX?/33$  
 for(int index=0;index<MAX_KEY;index++){ /0$405  
  if(hCallWnd[index]==0){ Do5.  
   hCallWnd[index]=hWnd; kP5G}Bp  
   HotKey[index]=cKey; W$`#X  
   HotKeyMask[index]=cMask; Oi]B%Uxy=  
   bAdded=TRUE; u^#e7u  
   KeyCount++; =BJe}AV  
   break; 2$`Y 4b3t  
  } .:GOKyr(~  
 } %<'.c9u5  
 return bAdded;  q*C-DiV  
} 3N|6?'m  
//删除热键 P=L@!F+s  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) HgBu:x?&  
{ 4sW~7:vU  
 BOOL bRemoved=FALSE; D;jbZ9  
 for(int index=0;index<MAX_KEY;index++){ z#rp8-HUDS  
  if(hCallWnd[index]==hWnd){ ;>;it5 l=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ "Nz@jv?  
    hCallWnd[index]=NULL; (ss,x CF  
    HotKey[index]=0; *OIBMx#qxn  
    HotKeyMask[index]=0; I_kA!^  
    bRemoved=TRUE; F6b;qb6n  
    KeyCount--; y$_]}<b  
    break; [tElt4uG  
   } ^]~!:Ej0  
  } B#35)QI  
 } k g Rys  
 return bRemoved; i[ws%GfEv  
} j)Kd'Va  
NV@$\ <  
m6]6 !_  
  DLL中的钩子函数如下: %DA`.Z9 #  
'5~l{3Lw  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) wO`G_!W9  
{ ' I!/I  
 BOOL bProcessed=FALSE; t 7sEY  
 if(HC_ACTION==nCode) UI%4d3   
 { K{V.N</  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 9?~6{!m_9  
   switch(wParam) x25zk4-  
   {  e$JCak=  
    case VK_MENU: zr_L V_e  
     MaskBits&=~ALTBIT; &A`,hF8  
     break; o;#8=q  
    case VK_CONTROL: 3K/ 'K[~  
     MaskBits&=~CTRLBIT; b& -8/t  
     break; bd% M.,  
    case VK_SHIFT: -5|el3%)  
     MaskBits&=~SHIFTBIT; %6m' |(-  
     break; ir>+p>s.  
    default: //judge the key and send message |F<%gJ  
     break; vts"  
   } " vc4QH$  
   for(int index=0;index<MAX_KEY;index++){ SBf=d<j 1)  
    if(hCallWnd[index]==NULL) mV)t  
     continue; IiE^HgM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DUH_LnHw)  
    { g jzWW0C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Dhfor+Epy  
     bProcessed=TRUE;  6pfkv2.}  
    } {XUSw8W'  
   } kBk2mMZ  
  } [?;L  
  else if((lParam&0xc000ffff)==1){ //有键按下 YnW9uy5  
   switch(wParam) R rYNtc  
   { <F"G~.^ *s  
    case VK_MENU: f5l\3oL  
     MaskBits|=ALTBIT; [p}~M-$V8Y  
     break; csxn" Dz\  
    case VK_CONTROL: .tyV =B:h  
     MaskBits|=CTRLBIT; </?ef&  
     break; mH5>50H;  
    case VK_SHIFT: Ggst s  
     MaskBits|=SHIFTBIT; 6d2e WS  
     break; *.+F]-  
    default: //judge the key and send message i[{*(Y$L  
     break; 0Zo><=  
   } vv<\LN0  
   for(int index=0;index<MAX_KEY;index++){ -yg;,nCg  
    if(hCallWnd[index]==NULL) ^Jdg%U?  
     continue; D/%v/mpj$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >i.$s  
    { }J92TV  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `T ^0&#  
     bProcessed=TRUE; 7!FiPH~kM  
    } Q u7ML]e?z  
   } 5 wN)N~JE  
  } |TkicgeS  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 @PhAg  
   for(int index=0;index<MAX_KEY;index++){ -U?%A:,a|  
    if(hCallWnd[index]==NULL) 8m `Y  
     continue; aG4 ^xOD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \Cin%S. C  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); jUR* |  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 $ndBT+ i  
   } ]Y76~!N  
  } LTH, a?lD  
 } X*d!A >s  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Aw4)=-LKO  
} x_?K6[G&}  
oWi#?'  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: WX_g  
"{H{-`Ni  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4gdXO  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~| ZAS]  
,H mGp  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: _%B,^0;C  
3DB= Xh  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :eB+t`M  
{ AeN:wOm  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) {_$['D^az  
 { ,1JQjsR   
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 hb/Z{T'   
  SaveBmp(); t7xJ "  
  return FALSE; /d Ua  
 } KbK!4  
 …… //其它处理及默认处理 <mTo54g  
} tx`^'%GMA  
Zu4CFX-4  
DW:\6k  
  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。 [eTEK W]  
o8%o68py  
  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。 |Zp') JiS  
|UQ [pas  
  二、编程步骤 FYefn3b  
Sz')1<  
  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"; p:{L fQ  
o54=^@>O<j  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; xcQ^y}JN  
l 6aD3?8LN  
  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; rwh 4/h^S  
`_ZbA#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; 48G^$T{  
BC1smSlJ  
  5、 添加代码,编译运行程序。 :6EX-Xyj  
pm i[M)D  
三、程序代码 m] p]J_6A  
~HT:BO$  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL REi"Aj=  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) CD^@*jH9"  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ S==0/  
#if _MSC_VER > 1000 0QrRG$<4X  
#pragma once $-!7<a-  
#endif // _MSC_VER > 1000 hjk]?MC  
#ifndef __AFXWIN_H__ ,kYX|8SO  
#error include 'stdafx.h' before including this file for PCH *UN*&DmF  
#endif ^"vmIC.h  
#include "resource.h" // main symbols Y(EF )::  
class CHookApp : public CWinApp FJ?]|S.?,  
{ 8. +f@wv  
 public: N}{V*H^0QU  
  CHookApp(); T<y fpUzX  
  // Overrides ~G6xk/+n-m  
  // ClassWizard generated virtual function overrides /6n"$qon6  
  //{{AFX_VIRTUAL(CHookApp) wnLpf  
 public: }v_|N"@  
  virtual BOOL InitInstance(); k][{4~z  
  virtual int ExitInstance(); 0D  `9  
  //}}AFX_VIRTUAL ybv< 1  
  //{{AFX_MSG(CHookApp) n%~r^ C_  
  // NOTE - the ClassWizard will add and remove member functions here. $ >].;y?$  
  // DO NOT EDIT what you see in these blocks of generated code ! UX|3LpFX&I  
  //}}AFX_MSG t0P_$+w.>  
  DECLARE_MESSAGE_MAP() !A|}_K1Cr  
}; JPj/+f  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); <dBz]W  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); vQ $"|8,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =_Z.x&fi  
BOOL InitHotkey(); j"zW0g!S  
BOOL UnInit(); QAY:H@Gt:  
#endif +G7[(Wz(z  
7suT26C  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. q_BMZEM  
#include "stdafx.h" IM2<:N%'  
#include "hook.h" 19oyoi"  
#include <windowsx.h> d+ $:u  
#ifdef _DEBUG uz=9L<$  
#define new DEBUG_NEW HoWK# Nz\  
#undef THIS_FILE `G*fx=N  
static char THIS_FILE[] = __FILE__; I,& gKgh  
#endif Jiru~Vo+  
#define MAX_KEY 100 HFz;"s3lWM  
#define CTRLBIT 0x04 BI!EmA  
#define ALTBIT 0x02 H,j_2JOY=  
#define SHIFTBIT 0x01 ]f wW dtz1  
#pragma data_seg("shareddata") 8/u kzY1!  
HHOOK hHook =NULL; c@4$)68  
UINT nHookCount =0; 2t{Tz}g*  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Lc-Wf zT  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT &rG]]IO  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey iP$>/[I  
static int KeyCount =0; +9<:z\B|  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift X"HVK+  
#pragma data_seg() ]Al)>  
HINSTANCE hins; |B^Picu  
void VerifyWindow(); Y[>`#RhP  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 4)L};B=  
//{{AFX_MSG_MAP(CHookApp) PBiA/dG[;  
// NOTE - the ClassWizard will add and remove mapping macros here. 6bf!v  
// DO NOT EDIT what you see in these blocks of generated code! ~ySsv  
//}}AFX_MSG_MAP V;~\+@  
END_MESSAGE_MAP() Lo}/k}3Sx  
-h8Z@r~a/  
CHookApp::CHookApp() 6D{70onY+  
{ G2|G}#E  
 // TODO: add construction code here, , BZ(-M  
 // Place all significant initialization in InitInstance ,eqRI>,\  
} X?`mYoe  
Ggv*EsN/cC  
CHookApp theApp; %Z*)<[cIE0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;oVOq$ql  
{ n \&H~0X  
 BOOL bProcessed=FALSE; wg:\$_Og  
 if(HC_ACTION==nCode) v9t'CMU  
 { PVmePgF   
  if((lParam&0xc0000000)==0xc0000000){// Key up "`Xbi/i  
   switch(wParam) YNp-A.o W@  
   { V%zo[A  
    case VK_MENU: 0B~x8f  
     MaskBits&=~ALTBIT; c<q~T >0k  
     break; N7X(gh2h  
    case VK_CONTROL: MdTu722  
     MaskBits&=~CTRLBIT; xz +;1JAL3  
     break; X@)'E9g5:  
    case VK_SHIFT: ~1S,[5u|s  
     MaskBits&=~SHIFTBIT; aan(69=jz  
     break; p}X *HJq$  
    default: //judge the key and send message Zu2 $$_+L  
     break; *Rc?rMF!  
   } 5.kKg=a  
   for(int index=0;index<MAX_KEY;index++){ rQTG-& ,  
    if(hCallWnd[index]==NULL) '#QZhz(+  
     continue; !y2yS/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #TeAw<2U  
    { eqWs(`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); TA#pA(k  
     bProcessed=TRUE; Ngm/5Lc  
    } 8'v:26   
   } IZd~Am3f  
  } scrss  
  else if((lParam&0xc000ffff)==1){ //Key down izu_KBzy  
   switch(wParam) JX{rum  
   { 0 r;tI"  
    case VK_MENU: /}5)[9GC  
     MaskBits|=ALTBIT; Q} g"pl  
     break; ]^@m $O  
    case VK_CONTROL: ;H?tcb*  
     MaskBits|=CTRLBIT; WO^]bR  
     break; /6 y;fx  
    case VK_SHIFT: V[7D4r.j  
     MaskBits|=SHIFTBIT; A\.{(,;kp  
     break; I3}I7oc_  
    default: //judge the key and send message [Qqss8a  
     break; Qv8 =CnuOT  
   } W&&C[@Jd3  
   for(int index=0;index<MAX_KEY;index++) 1{qG?1<zZ6  
   { }L^PZS@Jf  
    if(hCallWnd[index]==NULL) )cm^;(#pV  
     continue; o$}$Z&LK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zzT4+wy`  
    { ,V;HM F.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); bGlr>@;-r  
     bProcessed=TRUE; $ ]^Io)}f@  
    } m\|EM'@k  
   } aQj6XG u  
  } }|znQ3A2\l  
  if(!bProcessed){ l o- 42)  
   for(int index=0;index<MAX_KEY;index++){ j& L@L.d  
    if(hCallWnd[index]==NULL) %Bg>=C)^(1  
     continue; w@,v$4Oi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) mZjP;6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (/i|3P  
   } Rgz zbW  
  } DYgz;Y/%l  
 } >;fn,9w  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4-C'2?  
} sAF="uB  
OA[fQH#{lX  
BOOL InitHotkey() |HwEwL+  
{ 7DeBeY  
 if(hHook!=NULL){ ?MvL}o\|  
  nHookCount++; `?"r\Qo<  
  return TRUE; 71\GK  
 } 6ywO L'OBM  
 else M{YN^ Kk  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); (/!zHq  
  if(hHook!=NULL) 9LOq*0L_:  
   nHookCount++; Y&$puiH-j  
  return (hHook!=NULL); x l=i_  
} Lo=n)cV1,  
BOOL UnInit() TT&%[A+  
{ &=wvlI52`  
 if(nHookCount>1){ }8`>n4  
  nHookCount--; >g{b'Xx  
  return TRUE; /!*=*  
 } 0sF|Y%N  
 BOOL unhooked = UnhookWindowsHookEx(hHook); LQ||7>{eX  
 if(unhooked==TRUE){ gYmO4/c,  
  nHookCount=0; -Q%Pg<Q-#  
  hHook=NULL; KfQR(e9n   
 } $JiypX^DOP  
 return unhooked; ]y"=/Nu-Ja  
} .P ??N  
8,&Y\b`..  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) } #L_R  
{ %Lb cwh(9  
 BOOL bAdded=FALSE; ]<L~f~vU  
 for(int index=0;index<MAX_KEY;index++){ c h((u(G  
  if(hCallWnd[index]==0){  7Z<GlNv  
   hCallWnd[index]=hWnd; wu`+KUx  
   HotKey[index]=cKey; U^%)BI  
   HotKeyMask[index]=cMask; uXLZ!LJo  
   bAdded=TRUE; %e3E}m>  
   KeyCount++; V0W4M%  
   break; C=v+e%)x@  
  } +v:]#1  
 } :Ea|FAeK8  
 return bAdded; Oh>hy Y)}  
} @)vQ>R\k<  
PAtv#)h  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9F?-zn;2s  
{ CQ^(/B^c  
 BOOL bRemoved=FALSE; <t*<SdAq>`  
 for(int index=0;index<MAX_KEY;index++){ f?ibyoXL  
  if(hCallWnd[index]==hWnd){ 8oXp8CC  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ qswC> Gi  
    hCallWnd[index]=NULL; z@pa;_  
    HotKey[index]=0; ZkQ6~cM  
    HotKeyMask[index]=0; 2FV@ ?x0po  
    bRemoved=TRUE; ZGsd cnz  
    KeyCount--; o0S 8ki  
    break; %*wEzvt *  
   } HW,v"  
  } x?0K'  
 } l^B4.1rT  
 return bRemoved; )pT5"{  
} ;aX?K/  
\%.oi@A  
void VerifyWindow() jYFmL_{  
{ M0\gp@Fe  
 for(int i=0;i<MAX_KEY;i++){ s/s&d pT*  
  if(hCallWnd!=NULL){ wU<j=lY?f  
   if(!IsWindow(hCallWnd)){ &=$f\O1Ty  
    hCallWnd=NULL; Dj'?12Onu=  
    HotKey=0; A9u>bWIE7  
    HotKeyMask=0; dv3u<XM~  
    KeyCount--; VBF:MAA  
   } G$&jP:2q  
  } \[.qN  
 } 5|N`:h'9M  
} ^Jq('@  
SE@TY32T  
BOOL CHookApp::InitInstance() OdY9g2y#m  
{ 3o/f, }_  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); R){O]<+  
 hins=AfxGetInstanceHandle(); 8>6<GdGL<n  
 InitHotkey(); "kBVHy  
 return CWinApp::InitInstance(); ID! S}D  
} <)T~_s  
_@[W[= |H  
int CHookApp::ExitInstance() 6 R})KIG  
{ U`HY eJ  
 VerifyWindow(); |9IOZ>H9  
 UnInit(); l&e$:=;8  
 return CWinApp::ExitInstance(); 3oH/34jj  
} q*` m%3{  
qQG? k~r  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ~u2f`67{  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) n*na6rV\k  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ fDfph7[)  
#if _MSC_VER > 1000 a`#lYM%(>  
#pragma once ~9vK 6;0  
#endif // _MSC_VER > 1000 ujmIS~"  
j|K;Yi  
class CCaptureDlg : public CDialog r<!nU&FPD:  
{ a|oh Ad  
 // Construction Yk|.UuXT  
 public: `67i1w`  
  BOOL bTray; {z0iWY2Xw  
  BOOL bRegistered; Ng*-Bw)p]  
  BOOL RegisterHotkey(); LD5`9-  
  UCHAR cKey; {"{]S12N  
  UCHAR cMask; \R]2YY`EP  
  void DeleteIcon(); L3xN#W;m7  
  void AddIcon(); *.k*JsU~B  
  UINT nCount; 2y;vX|lX]  
  void SaveBmp(); ~&qvS  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor su1fsoL0  
  // Dialog Data Dv/7 w[F  
  //{{AFX_DATA(CCaptureDlg) h4|}BGO  
  enum { IDD = IDD_CAPTURE_DIALOG }; <,n:w[+!`P  
  CComboBox m_Key; O_4B> )zd  
  BOOL m_bControl; k_wcol,W  
  BOOL m_bAlt; jK*d  
  BOOL m_bShift; 4OgH+<G  
  CString m_Path; yF.Gz`yi  
  CString m_Number; Pvi2j&W84  
  //}}AFX_DATA jI*@&3  
  // ClassWizard generated virtual function overrides 2sk7E'2(  
  //{{AFX_VIRTUAL(CCaptureDlg) ``:[Jr &  
 public: NQ 6oyg@&  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 1v`|mU}i,  
 protected: E7? n'!=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Hv,ll1@h  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); U), HrI>;  
  //}}AFX_VIRTUAL nYZ6'Iwi'  
  // Implementation Y)5O %@Rl  
 protected: la-:"gKC  
  HICON m_hIcon; *!&?Xy%\"j  
  // Generated message map functions ,&S0/j  
  //{{AFX_MSG(CCaptureDlg) fK+E5~vQ  
  virtual BOOL OnInitDialog(); %,02i@Fc  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); `:V'E>B  
  afx_msg void OnPaint(); :dULsl$Nz  
  afx_msg HCURSOR OnQueryDragIcon(); 6?<lS.s  
  virtual void OnCancel(); s=jYQ5nv  
  afx_msg void OnAbout(); $9Bzq_!  
  afx_msg void OnBrowse(); i({\fb|0  
  afx_msg void OnChange(); !'F1Ht  
 //}}AFX_MSG md'wre3  
 DECLARE_MESSAGE_MAP() a@W9\b@I  
}; \ Voly  
#endif 0q-lyVZ^X  
* BR#^Wt  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >L4F'#I  
#include "stdafx.h" 8&"Jlz |  
#include "Capture.h" l$9k:#\FD  
#include "CaptureDlg.h" !0Nf`iCQ(  
#include <windowsx.h> nf"#F@dk  
#pragma comment(lib,"hook.lib") +<[q"3  
#ifdef _DEBUG uE9,N$\L_  
#define new DEBUG_NEW 7R:Ij[dV  
#undef THIS_FILE y _"V=:  
static char THIS_FILE[] = __FILE__; ROQ]sQpk  
#endif a_5s'Dh  
#define IDM_SHELL WM_USER+1 {O y|c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "%^_.Db>|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [[AO6.Z  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; B47I?~{  
class CAboutDlg : public CDialog o(Z~J}l({  
{  AkS16A  
 public: 54>0Dv??H  
  CAboutDlg(); O]=jI  
  // Dialog Data 1aRTvaGo  
  //{{AFX_DATA(CAboutDlg) W& 0R/y7  
  enum { IDD = IDD_ABOUTBOX }; +O 7( >a  
  //}}AFX_DATA *|\bS "  
  // ClassWizard generated virtual function overrides bs ~P  
  //{{AFX_VIRTUAL(CAboutDlg) C@`#@1X  
 protected: rmkBp_i{|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support K\U`gTGc  
  //}}AFX_VIRTUAL IMqe(  
  // Implementation [iq^'E  
 protected: E#rQJ  
  //{{AFX_MSG(CAboutDlg) vMou`[\WlJ  
  //}}AFX_MSG U; m@  
  DECLARE_MESSAGE_MAP() p+]S)K GZw  
}; ANw1P{9*  
Q2m[XcnX  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) u]Vt>Ywu  
{ ~210O5^  
 //{{AFX_DATA_INIT(CAboutDlg) L$OZ]  
 //}}AFX_DATA_INIT 9 CZ@IFS  
} _^GBfM.  
MjC<N[WO>N  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) TCyev[(  
{ o<!H/PN  
 CDialog::DoDataExchange(pDX); $aJay]F  
 //{{AFX_DATA_MAP(CAboutDlg) t>}S@T{~T  
 //}}AFX_DATA_MAP )$E){(Aa  
} SQf[1}$ .  
 d6tLC Q  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) i:jXh9+  
 //{{AFX_MSG_MAP(CAboutDlg) "*X\'LPs=  
 // No message handlers g{}<ptx]  
 //}}AFX_MSG_MAP 8el6z2  
END_MESSAGE_MAP() >KrI}>!9r  
]`x+wWe  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) q`2dL)E  
: CDialog(CCaptureDlg::IDD, pParent) 3<$Ek3X  
{ o}KVT%}  
 //{{AFX_DATA_INIT(CCaptureDlg) w@,p`  
  m_bControl = FALSE; dE,E,tv  
  m_bAlt = FALSE; 7!jb  
  m_bShift = FALSE; |Ol29C$@|  
  m_Path = _T("c:\\"); ^|Fy!kp  
  m_Number = _T("0 picture captured."); _dk[k@5W{'  
  nCount=0; _4Eq_w`  
  bRegistered=FALSE; d9TTAaf  
  bTray=FALSE; Y3[KS;_fr9  
 //}}AFX_DATA_INIT i3|xdYe$  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 8/)\nV$0Y  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); `H:`JBe=+[  
} 6?M/7 1  
'62_q8:  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) =L#&`s@)_  
{ tP! %(+V  
 CDialog::DoDataExchange(pDX); 5Q8 H8!^  
 //{{AFX_DATA_MAP(CCaptureDlg) +fboTsp% H  
  DDX_Control(pDX, IDC_KEY, m_Key); d38o*+JCf  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); |A*4Fuc&  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 7=?!B#hm !  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); G5U?]& I8  
  DDX_Text(pDX, IDC_PATH, m_Path); BXdk0  
  DDX_Text(pDX, IDC_NUMBER, m_Number); `W)?d I?#M  
 //}}AFX_DATA_MAP ^rq\kf*]  
} xOShO"4Z   
xP_%d,  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) *Xk5H,:  
//{{AFX_MSG_MAP(CCaptureDlg) |33t5}we  
 ON_WM_SYSCOMMAND() a~LA&>@  
 ON_WM_PAINT() !^F_7u@Q  
 ON_WM_QUERYDRAGICON() Iv  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) <]G'& iv>  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) "A Bt  
 ON_BN_CLICKED(ID_CHANGE, OnChange) T_Tu>wQX  
//}}AFX_MSG_MAP !~?/D  
END_MESSAGE_MAP() "0PsCr}!  
{u y^Bui}  
BOOL CCaptureDlg::OnInitDialog() b?`2LAgn  
{ #|je m   
 CDialog::OnInitDialog(); $6UU58>n  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ; ,sNRES3  
 ASSERT(IDM_ABOUTBOX < 0xF000); m0^ "fMV  
 CMenu* pSysMenu = GetSystemMenu(FALSE); %(&ja_oO  
 if (pSysMenu != NULL) g!_#$az3  
 { %JSRC<,a  
  CString strAboutMenu; -DHzBq=H  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Ow>u!P!  
  if (!strAboutMenu.IsEmpty()) K5LJx-x*j  
  { ?'f  
   pSysMenu->AppendMenu(MF_SEPARATOR); b3>zdS]Q  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ]\|2=  
  } iupkb  
 } MQw}R7  
 SetIcon(m_hIcon, TRUE); // Set big icon %+Nng<_U\T  
 SetIcon(m_hIcon, FALSE); // Set small icon |k}L=oWE  
 m_Key.SetCurSel(0); Vv(buG  
 RegisterHotkey(); ?+ d{Rh) y  
 CMenu* pMenu=GetSystemMenu(FALSE); |LC"1 k  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 8k:^( kByF  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); !$1qnsz  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); <h9nt4F  
 return TRUE; // return TRUE unless you set the focus to a control ba G_7>Q9H  
} .up[wt gN  
U'F}k0h?\'  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) S[$9_Jf  
{ _PPC?k{z!  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) I^f|U  
 { {"~[F2qR  
  CAboutDlg dlgAbout; K:< Viz  
  dlgAbout.DoModal(); =TEe:%mN  
 } :35h0;8+  
 else n[!QrEeR},  
 { 4t =Kt  
  CDialog::OnSysCommand(nID, lParam); Pf4zjc  
 } iT{4-j7|P4  
} `. JW_F)1  
}a!|n4|`  
void CCaptureDlg::OnPaint() `T+>E0H(f  
{ ;rT/gwg!  
 if (IsIconic()) ]8}2  
 { ws`r\k]3J  
  CPaintDC dc(this); // device context for painting ~cp=B>*(  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Ww8U{f  
  // Center icon in client rectangle \9p.I?=  
  int cxIcon = GetSystemMetrics(SM_CXICON); [I%e Ro[  
  int cyIcon = GetSystemMetrics(SM_CYICON); W^^0Rh_  
  CRect rect; g,WTXRy  
  GetClientRect(&rect); T2]8w1l&K  
  int x = (rect.Width() - cxIcon + 1) / 2; 4.,|vtp  
  int y = (rect.Height() - cyIcon + 1) / 2; ^kcuRJ0*$  
  // Draw the icon 8i;drvf  
  dc.DrawIcon(x, y, m_hIcon); {ST8'hY  
 } Lct_6?  
 else A3 TR'BFw-  
 { 0B9FPpx?:  
  CDialog::OnPaint(); .4E24FB[f?  
 } nT=%3_.  
} \6a' p Q,  
rU9")4sQ  
HCURSOR CCaptureDlg::OnQueryDragIcon() PO'K?hVS^w  
{ lGp:rw`  
 return (HCURSOR) m_hIcon; {~51h}>b#  
} <`Fl Igo  
S6bYd`  
void CCaptureDlg::OnCancel() <HJLs+C  
{ ^pe/~ :a  
 if(bTray) 8d'/w}GV  
  DeleteIcon(); ) C~#W  
  CDialog::OnCancel();  Rh6CV  
} j8e=],sQ  
&/^p:I  
void CCaptureDlg::OnAbout() & ;5f/  
{ e^~dx}X  
 CAboutDlg dlg; \NDW@!X  
 dlg.DoModal(); n7ZJ< ~wl  
} %2D'NZS  
ts[8;<YD  
void CCaptureDlg::OnBrowse() 7\$}|b[9  
{ ,ynN801\m  
 CString str; lgVT~v{U`n  
 BROWSEINFO bi; T7ShE-X  
 char name[MAX_PATH]; In%FOPO  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); r`FTiPD.C  
 bi.hwndOwner=GetSafeHwnd(); ?$A)lWk(  
 bi.pszDisplayName=name; S`mB1(h  
 bi.lpszTitle="Select folder"; 7`L]aRS[  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 0hkYexX73  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); <<qzZ+u  
 if(idl==NULL) [8tpU&J  
  return; 3VMaD@nYa  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); |]q{ qsy  
 str.ReleaseBuffer(); V3*@n*"N;  
 m_Path=str; U"@p3$2QW  
 if(str.GetAt(str.GetLength()-1)!='\\') En-=z`j G  
  m_Path+="\\"; Y=sv   
 UpdateData(FALSE); F\;l)  
} SLkgIb~'X  
^oDs*F  
void CCaptureDlg::SaveBmp() G DBV  
{ t`}=~/#`X  
 CDC dc; !7]^QdBLY  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ?t\GHQ$$?  
 CBitmap bm; 7w5l[a/  
 int Width=GetSystemMetrics(SM_CXSCREEN); /P[u vO  
 int Height=GetSystemMetrics(SM_CYSCREEN); +  rN#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); \C;Yn6PK0  
 CDC tdc; .aWwJZ=[  
 tdc.CreateCompatibleDC(&dc); 9(=+OQ6  
 CBitmap*pOld=tdc.SelectObject(&bm); z/5TYv)S  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *pS3xit~  
 tdc.SelectObject(pOld); %y>*9$<pXe  
 BITMAP btm; 'dQGb-<_<  
 bm.GetBitmap(&btm); $i8oLSRV  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; It3@ Cd>  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); mDwuJf8}  
 BITMAPINFOHEADER bih; 8EiS\$O-  
 bih.biBitCount=btm.bmBitsPixel; P%[ { 'u  
 bih.biClrImportant=0; VWXyN  
 bih.biClrUsed=0; gQhYM7NP{5  
 bih.biCompression=0; c2GTN"  
 bih.biHeight=btm.bmHeight; k?3mFWc  
 bih.biPlanes=1; qixnaiZ  
 bih.biSize=sizeof(BITMAPINFOHEADER); _ !"[Zr  
 bih.biSizeImage=size; buKkm$@w  
 bih.biWidth=btm.bmWidth; A;/,</  
 bih.biXPelsPerMeter=0; +m}D.u*cp  
 bih.biYPelsPerMeter=0; l'!_km0{d  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); F DGzh/  
 static int filecount=0; XI ><;#  
 CString name; ij?]fXf:)y  
 name.Format("pict%04d.bmp",filecount++); QRdtr  
 name=m_Path+name; z:Ru`  
 BITMAPFILEHEADER bfh; (i<\n`h1K  
 bfh.bfReserved1=bfh.bfReserved2=0; ZLP0SCkuR  
 bfh.bfType=((WORD)('M'<< 8)|'B'); VL\Ah3+  
 bfh.bfSize=54+size; >W:kTS<  
 bfh.bfOffBits=54; ,Wd+&|Q  
 CFile bf; NS x-~)  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 8-L -W[  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); /^si(BuC^*  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 0yUn~'+(Sp  
  bf.WriteHuge(lpData,size); iy8Ln,4z(  
  bf.Close(); >"zN`  
  nCount++; {c $8?6  
 } *m&'6qsS  
 GlobalFreePtr(lpData); ]REF1<)4z  
 if(nCount==1) M6Ik'r"M  
  m_Number.Format("%d picture captured.",nCount); |D;I>O^"R  
 else :9>U+)%  
  m_Number.Format("%d pictures captured.",nCount); Oeg^%Y   
  UpdateData(FALSE); W$D:mw7  
} ZS&+<kGD  
UY\E uA9  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Xa U ^^K  
{ o|s|Wm x>u  
 if(pMsg -> message == WM_KEYDOWN) 8RZqoQDH  
 { Q`=d5Uvw  
  if(pMsg -> wParam == VK_ESCAPE) ?|hYtV  
   return TRUE; 1NN#-U  
  if(pMsg -> wParam == VK_RETURN) >T14 J'\  
   return TRUE; y]k{u\2A  
 } p{0rHu[  
 return CDialog::PreTranslateMessage(pMsg); "GxQ9=Z  
} N40DL_-  
6D4u?P,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `Z@qWB<  
{ w/ID y Q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ pe\]}&  
  SaveBmp(); <5|:QLqy  
  return FALSE; >/-Bg:  
} ,F|49i.K  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [GW;RjPE  
 CMenu pop; A22'qgKm@  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); c`)[-  
 CMenu*pMenu=pop.GetSubMenu(0); k#5Qwxu`  
 pMenu->SetDefaultItem(ID_EXITICON); $C{-gx+:  
 CPoint pt; ]PH'G>x  
 GetCursorPos(&pt); 9$R}GK  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %$R]NL|  
 if(id==ID_EXITICON) Uo:=-NNI  
  DeleteIcon(); CY@#_z  
 else if(id==ID_EXIT) Q\le3KB  
  OnCancel(); #.@D}7y5  
 return FALSE; kbx4I?  
} al]-*=v7}  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); FCt %of#  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) EHq?yj;  
 AddIcon(); >\1j`/ :ZI  
 return res; [@$t35t~  
} [Al} GM  
Ch&2{ ng  
void CCaptureDlg::AddIcon() ?ieC>cr  
{ bqZ5GKUo  
 NOTIFYICONDATA data; Kl :x?"g)  
 data.cbSize=sizeof(NOTIFYICONDATA); SivJaY%  
 CString tip; 0{47TX*YX  
 tip.LoadString(IDS_ICONTIP); K3J,f2Cn$  
 data.hIcon=GetIcon(0); ? C6t Yd  
 data.hWnd=GetSafeHwnd(); *b(nX,e  
 strcpy(data.szTip,tip); E^Z?X2Z  
 data.uCallbackMessage=IDM_SHELL; Bc?KAK  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; cs Gd}2VE  
 data.uID=98; @_"Z]Y ,D0  
 Shell_NotifyIcon(NIM_ADD,&data); Dgz^s^fxU  
 ShowWindow(SW_HIDE); tNDv[IF  
 bTray=TRUE; srIt_Wq  
} >yt8gw0J  
vq5o?$:-  
void CCaptureDlg::DeleteIcon() -h&KC{Xab  
{ (5=B^9{R  
 NOTIFYICONDATA data; {= T9_c  
 data.cbSize=sizeof(NOTIFYICONDATA); 843O}v'  
 data.hWnd=GetSafeHwnd(); lMb&F[KJ7  
 data.uID=98; ,D{D QJ(B  
 Shell_NotifyIcon(NIM_DELETE,&data); -j}zr yG-  
 ShowWindow(SW_SHOW); AbOF/ g)C  
 SetForegroundWindow(); m+dJ3   
 ShowWindow(SW_SHOWNORMAL); >+ku:<Hw%.  
 bTray=FALSE; J4m2|HK  
} y-a3  
= _/XFN  
void CCaptureDlg::OnChange() |Y;[)s =q  
{ >B+!fi'SS>  
 RegisterHotkey(); B5/"2i  
} j:'8yFi_  
YyD0g9{  
BOOL CCaptureDlg::RegisterHotkey() QWAtF@qTV  
{ pn aSOyR  
 UpdateData(); !s[[X5  
 UCHAR mask=0; .]K{8[:hq  
 UCHAR key=0; X32{y973hT  
 if(m_bControl) v4X)R "jJ  
  mask|=4; yz^Rm2$f9  
 if(m_bAlt) N|  
  mask|=2; @*5(KIeeC>  
 if(m_bShift) 9<1dps=c  
  mask|=1; )s>R~7  
  key=Key_Table[m_Key.GetCurSel()]; *f3? 0w  
 if(bRegistered){ u:%Ln_S  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ')KuLVE}S  
  bRegistered=FALSE; `:YCOF  
 } KWi P`h8  
 cMask=mask; G Y+li {  
 cKey=key; t,308Z  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); h=MEQ-3jg  
 return bRegistered; 6[& x7"  
} $VUX?ii$7=  
%.  W56  
  四、小结 e4Q2$ Q@b  
\vqqs  
  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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