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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: `@eo <6  
  o-"/1zLg4  
  一、实现方法 OoL#8R  
ij i<+oul  
  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: Ta^l1]9.*  
GInU7y904  
#pragma data_seg("shareddata") 8@S7_x  
HHOOK hHook =NULL; //钩子句柄 [zmx  
UINT nHookCount =0; //挂接的程序数目 d:jD  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Ej\EuX  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 +Gv{Apd"  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey lIPy)25~  
static int KeyCount =0; 7A'd55I4  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 7DaMuh~<  
#pragma data_seg() ^c",!Lp}{  
| d}f\a`  
  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。 mGR}hsQpn  
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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: RSEo'2  
wG6@. ;3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR .1R:YNx{/  
cKey,UCHAR cMask) VbR /k,Co  
{ %%J)@k^vH  
 BOOL bAdded=FALSE; _hT-5)1r  
 for(int index=0;index<MAX_KEY;index++){  Khd"  
  if(hCallWnd[index]==0){ *((wp4b  
   hCallWnd[index]=hWnd; F)P"UQ!\  
   HotKey[index]=cKey; {*WJ"9ujp]  
   HotKeyMask[index]=cMask; U(#)[S,  
   bAdded=TRUE; F&?55@b  
   KeyCount++; W'2T7ha Es  
   break; +c&n7  
  } V/w:^@5+p  
 } Cw`8[)=}o  
 return bAdded; 0uX"KL]Elf  
} v^;-w~?3  
//删除热键 ;M,u,KH)/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +-_71rJc.  
{ Wr3j8"f/  
 BOOL bRemoved=FALSE; E({+2}=1  
 for(int index=0;index<MAX_KEY;index++){ jIY    
  if(hCallWnd[index]==hWnd){ !]c]:ed\C  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ HU[a b  
    hCallWnd[index]=NULL; +B^(,qKMN  
    HotKey[index]=0; rGb7p`J  
    HotKeyMask[index]=0; scmn-4j'{  
    bRemoved=TRUE; jG($:>3a@  
    KeyCount--; %7tQam  
    break; z@!zQ Vp  
   } Cj~45)r  
  } 97"dOi!Wh  
 } rMDo5Z2  
 return bRemoved; qyXx`'e  
} .Q'/e>0  
vfID@g`!q+  
BR8W8nRb  
  DLL中的钩子函数如下: 5#jna9Xc  
dc#Db~v}k  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) } sTo,F$  
{ B<.XowT'  
 BOOL bProcessed=FALSE; c&zZsJ"~  
 if(HC_ACTION==nCode) 9G8n'jWyY  
 { .ZSGnbJ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 r()%s3$q  
   switch(wParam) 5 `:+NwXS2  
   {  %9.] bd|%F  
    case VK_MENU: {0(:7IY,  
     MaskBits&=~ALTBIT; h&|wqna  
     break; NwQexYm1_  
    case VK_CONTROL: RG(m:N  
     MaskBits&=~CTRLBIT; nnBgTtsC]  
     break; ] iKFEd  
    case VK_SHIFT: gI^);J rTE  
     MaskBits&=~SHIFTBIT; QusEWq)}<  
     break; TmS;ybsG  
    default: //judge the key and send message K`.wj8zGY  
     break; f'/@h Na3  
   } :SxOQ(n  
   for(int index=0;index<MAX_KEY;index++){ Mwdh]I,#  
    if(hCallWnd[index]==NULL) e2#"o{+@  
     continue; a!"81*&4#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $[VeZ-  
    { riI0k{   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 9IL#\:d1  
     bProcessed=TRUE; oRM EC7!A0  
    } }G&#pw2  
   } .vRLK  
  } @aR!  -}  
  else if((lParam&0xc000ffff)==1){ //有键按下 &fYx0JT  
   switch(wParam) dN>XZv  
   { fk!wq. a  
    case VK_MENU: :W5*fE(i  
     MaskBits|=ALTBIT; Gy[;yLnX  
     break; g# ZR, q  
    case VK_CONTROL: J'.:l}g!1  
     MaskBits|=CTRLBIT; E0=-6j  
     break; _<5o1  
    case VK_SHIFT: /LhAQpUQT5  
     MaskBits|=SHIFTBIT; rtDm<aUh  
     break; x]%e_  
    default: //judge the key and send message q`09   
     break; zMX7 #,  
   } ]+[ NX)=  
   for(int index=0;index<MAX_KEY;index++){ @Z!leyam  
    if(hCallWnd[index]==NULL) (c(c MC'  
     continue; wP1dPl_j:0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) io cr  
    { , j ,[4^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +3vK=d_Va  
     bProcessed=TRUE; ld94ek  
    } kgK7 T  
   } g'Ft5fQ"o/  
  } mKZ?H$E%%  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 @{.rDz  
   for(int index=0;index<MAX_KEY;index++){ mBc;^8I?23  
    if(hCallWnd[index]==NULL) sCaw"{5qc  
     continue; H's67E/>*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7&NRE"?G  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %-]j;'6}cX  
     //lParam的意义可看MSDN中WM_KEYDOWN部分  yyk[oH-Q  
   } {#q<0l  
  } Q" VFcp:  
 } ]*}*zXN/E  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ZcX%:ebKS  
} -'{ioHt&X/  
?TE#4}p|  
  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: qfppJ8L  
fJOU1%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Du$kDCU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); A3&8@/6,  
-N5r[*>  
  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: wx(| $2{h  
S7wZCQe  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~n]:f7?I  
{ nP'ab_>b  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) &Z=}H0y q  
 { 'n4zFj+S  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 a>sUq["  
  SaveBmp(); lhQ*;dMj%"  
  return FALSE; H) q9.Jg  
 } 1$@k@*u\  
 …… //其它处理及默认处理 VbBZ\`b  
} w \0=L=J  
p`{<q -  
"5XD+qi  
  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。 j@UW[,UI  
K* [cJcY+  
  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。 LdWeI  
*PL+)2ob  
  二、编程步骤 A!iH g__/t  
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  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"; ^_5$+  
.&r] ?O  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Wf: AMxDm  
nkN]z ^j  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; c~R ElL  
IA8kq =W  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ^Po\:x%o  
cY\-e?`=4  
  5、 添加代码,编译运行程序。 *#UDMoz<  
8VMq>-  
三、程序代码 "]MF =-v  
c$uV8_V  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL I &{dan2  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) /#>?wy<s ~  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ q%>L/KJ#  
#if _MSC_VER > 1000 p' /$)klt  
#pragma once B>?. Nr  
#endif // _MSC_VER > 1000 7;|6g8=  
#ifndef __AFXWIN_H__ >b{%j8u M  
#error include 'stdafx.h' before including this file for PCH T w"^I*B  
#endif 7!MW`L/`  
#include "resource.h" // main symbols /tt  
class CHookApp : public CWinApp deeOtco$LT  
{ /}M@ @W  
 public: B*D`KA  
  CHookApp(); H.i_,ZF  
  // Overrides gvy%`SSW  
  // ClassWizard generated virtual function overrides h ?p^DPo  
  //{{AFX_VIRTUAL(CHookApp) _v2FXm   
 public: /5yW vra  
  virtual BOOL InitInstance(); L}:u9$w  
  virtual int ExitInstance(); y'4=  
  //}}AFX_VIRTUAL Z#4? /'  
  //{{AFX_MSG(CHookApp) !Rsx)  
  // NOTE - the ClassWizard will add and remove member functions here. +(|T\%$DT  
  // DO NOT EDIT what you see in these blocks of generated code ! AeUwih. 4  
  //}}AFX_MSG ?"sk"{  
  DECLARE_MESSAGE_MAP() oz[E>%  
}; eU{=x$o6S  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); -} Z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "2=v?,'t  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +Do7rl  
BOOL InitHotkey(); 0kC!v,  
BOOL UnInit(); \" .3x PkE  
#endif ] YQ*mvI]  
@p `#y  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. M>T#MDK\(  
#include "stdafx.h" @+xkd(RfN  
#include "hook.h" DUW;G9LP$-  
#include <windowsx.h> %AW  
#ifdef _DEBUG }A2@1TTPX  
#define new DEBUG_NEW vx-u+/\  
#undef THIS_FILE ]Fj z+CGg  
static char THIS_FILE[] = __FILE__; YTYYb#"Q  
#endif k92189B9j/  
#define MAX_KEY 100 j4brDlo?@  
#define CTRLBIT 0x04 ;J?!D x  
#define ALTBIT 0x02 UGR5ILf  
#define SHIFTBIT 0x01 M(/%w"R  
#pragma data_seg("shareddata") ZC0F:=/K  
HHOOK hHook =NULL; ,L_p"A  
UINT nHookCount =0; q:nYUW o   
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 'VF9j\a  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT P^1rNB  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey LW,!B.`@  
static int KeyCount =0; dd$\Q  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ]CHMkuP[k  
#pragma data_seg() ][qZOIk@  
HINSTANCE hins; fh,Y#.V`  
void VerifyWindow(); R$w=+%F  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) /nC"'d(#  
//{{AFX_MSG_MAP(CHookApp) "w_(p|cm=  
// NOTE - the ClassWizard will add and remove mapping macros here. GU"MuW`u2  
// DO NOT EDIT what you see in these blocks of generated code! xp,H5 m%  
//}}AFX_MSG_MAP I#9K/[  
END_MESSAGE_MAP() 3-_4p8OK  
8I~H1  
CHookApp::CHookApp() w|$;$a7)  
{ (1TYJ. Z  
 // TODO: add construction code here, E2dSOZS:)%  
 // Place all significant initialization in InitInstance (T`x-wTl  
} s!UC{)g,  
8@Y@5)Oc  
CHookApp theApp; -8TJ~t%w4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) XvdK;  
{ K,^b=_]  
 BOOL bProcessed=FALSE; $Y ]*v)}X  
 if(HC_ACTION==nCode) R4qS,2E  
 { i44KTC"sB  
  if((lParam&0xc0000000)==0xc0000000){// Key up 9$Hgh7'hvs  
   switch(wParam) `Y+p7*Qr2  
   { Lqz}h-Ei  
    case VK_MENU: [%bshaY:  
     MaskBits&=~ALTBIT; ?{^T&<18t  
     break; Y.&z$+  
    case VK_CONTROL: /S|Pq!4<  
     MaskBits&=~CTRLBIT; 7e u7ie6  
     break; hS<x+|'l  
    case VK_SHIFT: L x(Y=  
     MaskBits&=~SHIFTBIT; I-+D+DhRx  
     break; Zb}=?fcL;@  
    default: //judge the key and send message m~X:KwK4  
     break; ,9q5jOnk  
   } Q@l3XNH|c  
   for(int index=0;index<MAX_KEY;index++){ 7(wY4T  
    if(hCallWnd[index]==NULL) |n* I}w^  
     continue; 4J_18.JHP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) < v0 d8  
    { Ee4oTU5Mb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 9/Q5(P  
     bProcessed=TRUE; y'Wz*}8pr  
    } LoNz 1KJL  
   } "y5c)l(Rg  
  } uv._N6mj  
  else if((lParam&0xc000ffff)==1){ //Key down C+2*m=r  
   switch(wParam) My=p>{s  
   { ;Wb W\,P'  
    case VK_MENU: *Q5/d9B8TN  
     MaskBits|=ALTBIT; o- GHAQ  
     break; <BT}Tv9  
    case VK_CONTROL: p6I@o7f  
     MaskBits|=CTRLBIT; Z wIsEJz  
     break; ar>S_VW*  
    case VK_SHIFT: qDL9  
     MaskBits|=SHIFTBIT; o^5xCK:Oi2  
     break; C\ 9eR  
    default: //judge the key and send message 9<,\ +}^{  
     break; s_p?3bKu  
   } m<TKy_C`  
   for(int index=0;index<MAX_KEY;index++) \$GlB+ iCx  
   { (w)Qt/P^4  
    if(hCallWnd[index]==NULL) v(]\o;/O  
     continue; #L[Atx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^%*%=LJm  
    { mI9~\k&9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `3\5&Bf  
     bProcessed=TRUE; I`zn#U'  
    } m03;'Nj'7#  
   } dk-Y!RfNx  
  } lc#su$xR>  
  if(!bProcessed){ ;1K.SDj  
   for(int index=0;index<MAX_KEY;index++){ O~l WFaW  
    if(hCallWnd[index]==NULL) 2["bS++?  
     continue; op/|&H'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) mp>,TOi~s7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 7WKb| /#;  
   } ?0Z?Z3)%w4  
  } DMsxHAE1  
 } #-Ehg4W  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (Lp<T!"  
} $wub)^  
josc  
BOOL InitHotkey() cxp>4[gH  
{ O#sDZ.EL  
 if(hHook!=NULL){ ^fQ ]>/u  
  nHookCount++; Uf 1i "VY  
  return TRUE; DUFfk6#X}  
 } .|G([O^H  
 else 4'RyD<K\  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); +.! F]0ju  
  if(hHook!=NULL) T/X[q7O~~4  
   nHookCount++; [daUtKz  
  return (hHook!=NULL); Y1h8O%?  
} Mxc0=I'a  
BOOL UnInit() dmgoVF_qR  
{ [u`v'*0d  
 if(nHookCount>1){ W]}y:_t4  
  nHookCount--; 7y""#-}V[r  
  return TRUE; ^7G@CBic"  
 } >TK:&V  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ,qz$6oxh\  
 if(unhooked==TRUE){ ('hr;s=  
  nHookCount=0; )*}2L_5]  
  hHook=NULL; W|XW2`3p  
 } 0hVw=KDO9:  
 return unhooked; dfAnOF"-  
} x|g>Zd/n  
{ss^L  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !YYI{BJ7:N  
{ ,l+lokD-#  
 BOOL bAdded=FALSE; O10,h(O  
 for(int index=0;index<MAX_KEY;index++){ Q"itV&d,  
  if(hCallWnd[index]==0){ l.[S.@\=.  
   hCallWnd[index]=hWnd; <H03i"Z/S  
   HotKey[index]=cKey; C^oj/} ^  
   HotKeyMask[index]=cMask; VJviX[V?4  
   bAdded=TRUE; {"k}C2K'r  
   KeyCount++; rWsUWA T*  
   break; 4BF \- lq~  
  } *|n-Hr  
 } }ADdKK-  
 return bAdded; T rK-XTev  
} nsW #  
Esx"nex  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) PggjuPPh  
{ t*J *?Ma  
 BOOL bRemoved=FALSE; jMFLd  
 for(int index=0;index<MAX_KEY;index++){ nbd-f6F6  
  if(hCallWnd[index]==hWnd){ .Y`;{)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &gGh%:`B  
    hCallWnd[index]=NULL; 5A Fy6Ab  
    HotKey[index]=0; Q1hHK'3w  
    HotKeyMask[index]=0; EGJ d:>k  
    bRemoved=TRUE; GS_+KR\  
    KeyCount--; r2!\Ts5v  
    break; LKC^Y) 6o  
   } T)N_~f|  
  } SrVo0$5)  
 } _`|te|ccF  
 return bRemoved; LeP;HP|  
} bEvlk\iql  
4zo^ b0v  
void VerifyWindow() Yf&P|Iiw  
{ ?F=^& v8  
 for(int i=0;i<MAX_KEY;i++){ L'A9TW2  
  if(hCallWnd!=NULL){ cJ^{iOQ+  
   if(!IsWindow(hCallWnd)){ Sao4MkSz[]  
    hCallWnd=NULL; yq7gBkS  
    HotKey=0; `PoFKtVX M  
    HotKeyMask=0; "/ 9EUbca  
    KeyCount--; 3aX/)v.:4  
   } h&|PHI  
  } V$?@ z>7  
 } ;07>ZH%  
} 5Q$.q &,  
DWwPid} "  
BOOL CHookApp::InitInstance() P Y&(ObC  
{ Mil+> X0  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); je#OV,uHM  
 hins=AfxGetInstanceHandle(); m%s&$  
 InitHotkey(); T1*%]6&V|  
 return CWinApp::InitInstance(); E;MelK<8(  
} `k;MGs)&  
:3N&&]  
int CHookApp::ExitInstance() B?gFFU61  
{ C{<H)?]*BF  
 VerifyWindow(); ,L&d\M"f  
 UnInit(); ks|c'XQb  
 return CWinApp::ExitInstance(); wl.a|~-  
} 2{}8_G   
J`[v u4  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file kMx^L;:n  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) sS{!z@\Lf  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ }.k*4Vw#Wt  
#if _MSC_VER > 1000 oAprM Z 7Y  
#pragma once E (.~[-K4  
#endif // _MSC_VER > 1000 M/a40uK  
`UD,ne  
class CCaptureDlg : public CDialog 93VbB[w~7F  
{ XVfw0-O  
 // Construction zL!}YR@&u"  
 public: }bZb8hiG  
  BOOL bTray; s1>d)2lX  
  BOOL bRegistered; %'w?fqk  
  BOOL RegisterHotkey(); A4{p(MS5  
  UCHAR cKey; z]/!4+  
  UCHAR cMask; [/Sk+ID  
  void DeleteIcon(); j"r7M|Z+V  
  void AddIcon(); hX)PdRk#  
  UINT nCount; ( yK@(euG  
  void SaveBmp(); >&YUV.mLY  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor eA_]%7+`  
  // Dialog Data - !QVM\t  
  //{{AFX_DATA(CCaptureDlg) !~Ptnr`;  
  enum { IDD = IDD_CAPTURE_DIALOG }; 7e:eL5f>~  
  CComboBox m_Key; _;mA(j  
  BOOL m_bControl; v\2- %  
  BOOL m_bAlt; %Y-5L;MI  
  BOOL m_bShift; "F:V$,mJ  
  CString m_Path; yu}yON  
  CString m_Number; ^{Fo,7  
  //}}AFX_DATA B|K^:LUk9  
  // ClassWizard generated virtual function overrides l T#WM]  
  //{{AFX_VIRTUAL(CCaptureDlg) xzXNcQ  
 public: 8?hZ5QvA(j  
  virtual BOOL PreTranslateMessage(MSG* pMsg); j6WDh}#  
 protected: }R!t/ 8K  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support W3gHz T?{  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); oU|_(p"e|  
  //}}AFX_VIRTUAL BA8g[T A7K  
  // Implementation n0QHrIf{  
 protected: vA2>&YDFX  
  HICON m_hIcon; Dkg^B@5Xr  
  // Generated message map functions VVbFn9+V  
  //{{AFX_MSG(CCaptureDlg) 4_-L1WH  
  virtual BOOL OnInitDialog(); b}&.IJ&40j  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 7J1f$5$m5  
  afx_msg void OnPaint(); I7HGV(  
  afx_msg HCURSOR OnQueryDragIcon(); mu2|%$C;$  
  virtual void OnCancel(); NJCSo(O  
  afx_msg void OnAbout(); >8|V[-H  
  afx_msg void OnBrowse(); /r8sL)D+  
  afx_msg void OnChange(); NiYT%K%  
 //}}AFX_MSG 2UG>(R:  
 DECLARE_MESSAGE_MAP() Bbtc[@"X  
}; 7 lSR  
#endif 0oe2X1.%  
WRrg5&._q  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file LYr9a(  
#include "stdafx.h" @~}~;}0x  
#include "Capture.h" #O{cplh,  
#include "CaptureDlg.h" A;k#8&;  
#include <windowsx.h> m@']%X*(,  
#pragma comment(lib,"hook.lib") {55f{5y3 c  
#ifdef _DEBUG YU XxQ|  
#define new DEBUG_NEW i91k0q*di  
#undef THIS_FILE SmAii}-jf  
static char THIS_FILE[] = __FILE__; xiV!\Z}  
#endif >2v<;.  
#define IDM_SHELL WM_USER+1 {Iz"]Wh<f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .7M.bpmqE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dA^{}zZu  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; uPC(|U%  
class CAboutDlg : public CDialog BSL+Gjj~}  
{ N_G84wxx  
 public: &fsk ESV0  
  CAboutDlg(); uqD|j:~ =k  
  // Dialog Data :2V|(:^ '  
  //{{AFX_DATA(CAboutDlg) p(cnSvg  
  enum { IDD = IDD_ABOUTBOX }; 4,f`C0>"  
  //}}AFX_DATA "<Yxt"Z4  
  // ClassWizard generated virtual function overrides ?M^qSo=/~  
  //{{AFX_VIRTUAL(CAboutDlg) O`I}Lg]~q  
 protected: ac6@E4 _  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mM~&mAa+Z  
  //}}AFX_VIRTUAL a|(|!=  
  // Implementation Vvp{y  
 protected: $$SJLV  
  //{{AFX_MSG(CAboutDlg) hgbf"J6V8  
  //}}AFX_MSG \qTp#sF  
  DECLARE_MESSAGE_MAP() Hy -)yR  
}; ^/cqE[V~,  
HXX9D&c4R  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) `[e0_g\  
{ *>HS>#S  
 //{{AFX_DATA_INIT(CAboutDlg) s8'!1rHd  
 //}}AFX_DATA_INIT aHb&+/HZ  
} JpZ_cb`<E'  
F+?i{$  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Anqt:(  
{ ] _W'-B  
 CDialog::DoDataExchange(pDX); SrGJ#K&%  
 //{{AFX_DATA_MAP(CAboutDlg) K:% MhH-  
 //}}AFX_DATA_MAP }x& X vI  
} %_!0V*X*  
-[&Z{1A4x4  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ;#+I"Ow  
 //{{AFX_MSG_MAP(CAboutDlg) 1]Cb i7  
 // No message handlers _\8E/4zh  
 //}}AFX_MSG_MAP 2^"! p;WQ  
END_MESSAGE_MAP() $at\aJ  
%Pl |3i  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Z op/ MeI  
: CDialog(CCaptureDlg::IDD, pParent) e@]m@  
{ r\}?HS06  
 //{{AFX_DATA_INIT(CCaptureDlg) 6 8fnh'I!  
  m_bControl = FALSE;  Lsai8 B  
  m_bAlt = FALSE; U#- 5",X|  
  m_bShift = FALSE; \ So)g)K  
  m_Path = _T("c:\\"); m-a':  
  m_Number = _T("0 picture captured."); Nq^o8q_  
  nCount=0; q2OF-.rE  
  bRegistered=FALSE; /;:4$2R(;  
  bTray=FALSE; B5h)F> &G  
 //}}AFX_DATA_INIT f:y:: z  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Z0O0Q=e\Y  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); I,05'edCQ  
} ]JvjM,  
2yD ?f8P4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Vq/hk  
{ )~S`[jV5  
 CDialog::DoDataExchange(pDX); f}KV4'n  
 //{{AFX_DATA_MAP(CCaptureDlg) __1Hx?f  
  DDX_Control(pDX, IDC_KEY, m_Key); n5efHJU  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); qsN_EMgbdn  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ydRS\l  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); :cIPX%S  
  DDX_Text(pDX, IDC_PATH, m_Path); X+HPdrT  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ??|,wIRz  
 //}}AFX_DATA_MAP {zc*yV\  
} DHyQ:0q  
n{qVF#N_  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) C OL"/3r  
//{{AFX_MSG_MAP(CCaptureDlg) sFvYCRw /  
 ON_WM_SYSCOMMAND() 0S }\ML  
 ON_WM_PAINT() ar'VoL}  
 ON_WM_QUERYDRAGICON() {w,<igh  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) %s5( ''a.  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) `K[r5;QFKf  
 ON_BN_CLICKED(ID_CHANGE, OnChange) O-pH~E  
//}}AFX_MSG_MAP q$s)(D  
END_MESSAGE_MAP() \{Je!#  
@Jlsx0i}}  
BOOL CCaptureDlg::OnInitDialog() x>Dix1b:.  
{ 9"L!A,&'  
 CDialog::OnInitDialog(); X4Uy3TV>  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); /}%C'  
 ASSERT(IDM_ABOUTBOX < 0xF000); Y{@foIZ  
 CMenu* pSysMenu = GetSystemMenu(FALSE); :xO43z  
 if (pSysMenu != NULL) 7|[Dr@.S  
 {  n$>_2v  
  CString strAboutMenu; vfVF^ WOd  
  strAboutMenu.LoadString(IDS_ABOUTBOX); z,@R jaX  
  if (!strAboutMenu.IsEmpty()) _g D9oK  
  { F4~O-g.<  
   pSysMenu->AppendMenu(MF_SEPARATOR); LW/> %  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); mZ3Z8q}%P  
  } f{\[+>  
 } ^L\w"`,~  
 SetIcon(m_hIcon, TRUE); // Set big icon UIZ9" Da  
 SetIcon(m_hIcon, FALSE); // Set small icon An,TunX  
 m_Key.SetCurSel(0); y.gNjc  
 RegisterHotkey(); ;qUd]c9oi  
 CMenu* pMenu=GetSystemMenu(FALSE); qjf4G[]!  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); goD#2lg  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); S3QX{5t\  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); "CFU$~  
 return TRUE; // return TRUE unless you set the focus to a control )IIWXN2A  
} g(S4i%\  
Q(Pc  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) X&@>M}  
{ ?8<R)hJa<  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) +4 D#Ht 7  
 { ?fpI,WFu  
  CAboutDlg dlgAbout;  xG'F  
  dlgAbout.DoModal(); c.>OpsF  
 } sd*NY  
 else =;?Maexp3$  
 { ' (3|hh)Tl  
  CDialog::OnSysCommand(nID, lParam); F7=&CW 0  
 } )Q|sW+AF  
} H]M[2C7#N  
=RlAOgJ  
void CCaptureDlg::OnPaint() Of<Vr.m{R  
{ ,pdf$) XB  
 if (IsIconic()) !4$o*{9Lx:  
 { 7|)K!  
  CPaintDC dc(this); // device context for painting /AUX7 m.8  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); quq!Jswn  
  // Center icon in client rectangle `mN5sq  
  int cxIcon = GetSystemMetrics(SM_CXICON); ZM57(D  
  int cyIcon = GetSystemMetrics(SM_CYICON); T@r%~z  
  CRect rect; cNl$ vP83z  
  GetClientRect(&rect); dQNW1-s  
  int x = (rect.Width() - cxIcon + 1) / 2; cA!o xti  
  int y = (rect.Height() - cyIcon + 1) / 2; 5d)\Z0s  
  // Draw the icon >T^BD'z@'  
  dc.DrawIcon(x, y, m_hIcon); |W|RX3D  
 } Z. xOO|  
 else % +M,FgW  
 { Cs^'g'  
  CDialog::OnPaint(); ey U*20  
 } @ | (Tg  
} v-B&"XGy:  
LJ*W&y(2>Q  
HCURSOR CCaptureDlg::OnQueryDragIcon() v)v`896S`  
{ K|rG&#1J  
 return (HCURSOR) m_hIcon; [-3x*?Ju  
} )zo:Bo .<  
IvB)d}p  
void CCaptureDlg::OnCancel() 'L veCi_  
{ {6;S= 9E\  
 if(bTray) L#u!T)!zW  
  DeleteIcon(); z?C& ,mv  
  CDialog::OnCancel(); zj#8@gbh+  
} q_h/zPuH'  
#pWeMt'  
void CCaptureDlg::OnAbout() JP6+h>ft  
{ #AH<dS  
 CAboutDlg dlg; ,4S6F HK  
 dlg.DoModal(); DG 6W ^  
} p4wx&VLi  
V7,;N@FL  
void CCaptureDlg::OnBrowse() c+G%o8  
{ !<4=@  
 CString str; PKX Tj6hj)  
 BROWSEINFO bi; aHSl_[  
 char name[MAX_PATH]; m+pFU?<|  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); QfI@=Kbg%#  
 bi.hwndOwner=GetSafeHwnd();  <4 D.H  
 bi.pszDisplayName=name; ~x g#6%<=  
 bi.lpszTitle="Select folder"; je5GZFQw  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; n4DKLAl  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); >~rytg]f  
 if(idl==NULL) ^<+V[ =X  
  return; Ydh+iLjhx  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); _{y4N0  
 str.ReleaseBuffer(); fO 6Jug  
 m_Path=str; p!H'JNG  
 if(str.GetAt(str.GetLength()-1)!='\\') fwz-)?   
  m_Path+="\\"; {M P (*N  
 UpdateData(FALSE); *n2le7  
} 1 ac;6`  
;hJz'&UWQ  
void CCaptureDlg::SaveBmp() 0z`-fQfK  
{ ,2Q5'!o  
 CDC dc; &4jc3_UKV  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); *QP+p,L*  
 CBitmap bm; )wfqGkr=m!  
 int Width=GetSystemMetrics(SM_CXSCREEN); k/2TvEV3=  
 int Height=GetSystemMetrics(SM_CYSCREEN); ,*d<hBGbh  
 bm.CreateCompatibleBitmap(&dc,Width,Height); !9vq"J~hz"  
 CDC tdc; roHJ$~q?  
 tdc.CreateCompatibleDC(&dc); V8" m_  
 CBitmap*pOld=tdc.SelectObject(&bm); SuFGIb7E  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Q;0 g  
 tdc.SelectObject(pOld); whh#J (  
 BITMAP btm; L_Lhmtm}m  
 bm.GetBitmap(&btm); NRDXWscb  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ^/DP%^D  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); o'Kl+gw4  
 BITMAPINFOHEADER bih; %SN"<O!  
 bih.biBitCount=btm.bmBitsPixel; + vO; J  
 bih.biClrImportant=0; {P!1VYs5  
 bih.biClrUsed=0; {&0u:  
 bih.biCompression=0; _tR?WmNH=  
 bih.biHeight=btm.bmHeight; X}_Gk5q*  
 bih.biPlanes=1; #(G"ya  
 bih.biSize=sizeof(BITMAPINFOHEADER); TWSx9ii!M:  
 bih.biSizeImage=size; /xw}]Fa5  
 bih.biWidth=btm.bmWidth; dd:vQOF;  
 bih.biXPelsPerMeter=0; QHgkfo  
 bih.biYPelsPerMeter=0; OI^sd_gkZ  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); cN%@ nW0i  
 static int filecount=0;  {B7${AE  
 CString name; s |!lw  
 name.Format("pict%04d.bmp",filecount++); ~UQX t r  
 name=m_Path+name; lkJ"f{4f  
 BITMAPFILEHEADER bfh; FqXE6^  
 bfh.bfReserved1=bfh.bfReserved2=0; XS=f>e1<W  
 bfh.bfType=((WORD)('M'<< 8)|'B'); W}'l8z]   
 bfh.bfSize=54+size; g<g$c<sm  
 bfh.bfOffBits=54; ky@ZEp=  
 CFile bf; BI+x6S>d  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 4n6t(/]b<  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); <ZjT4><  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); W?<<al*  
  bf.WriteHuge(lpData,size); '9@AhiNV  
  bf.Close(); r-$VPW  
  nCount++; qFN`pe,  
 } TW-^C ;  
 GlobalFreePtr(lpData); z>z9xG'  
 if(nCount==1) !p!^[/9"c  
  m_Number.Format("%d picture captured.",nCount); & X#6jTh+  
 else `APeS=< &  
  m_Number.Format("%d pictures captured.",nCount); m,V"S(A  
  UpdateData(FALSE); .~X&BY>qP  
} u4|) A4n  
3L:SJskYR  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) )3.=)?XW  
{ ;e6L@)dp9  
 if(pMsg -> message == WM_KEYDOWN) }U|0F#0$  
 { *yYeqm  
  if(pMsg -> wParam == VK_ESCAPE) Og7^7))  
   return TRUE; Cs2kbG_  
  if(pMsg -> wParam == VK_RETURN) -f["1-A  
   return TRUE; kK=f@l  
 } p %hvDC  
 return CDialog::PreTranslateMessage(pMsg); {9v Mc  
} $kccM& B  
-?w3j9kk>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) yVWt%o/  
{ T%4yPmY  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ kgd dq  
  SaveBmp(); X@za4d  
  return FALSE; ce:wF#Qs  
} l ;S_J^S  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ mYbu1542'n  
 CMenu pop; W@RD bsc  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); kQ"Ax? b  
 CMenu*pMenu=pop.GetSubMenu(0); eOahr:Db  
 pMenu->SetDefaultItem(ID_EXITICON); =R*IOJ  
 CPoint pt; NIHcX6Nw  
 GetCursorPos(&pt); Tnas$=J  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); NfZC}  
 if(id==ID_EXITICON) ~( :$c3\  
  DeleteIcon(); #'. '|z  
 else if(id==ID_EXIT) eoJ*?v  
  OnCancel(); m[v%Qe|~  
 return FALSE; 9Y?``QBN  
} ' pIC~  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); f|Nkk*9$  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ?*6Q ;.f<  
 AddIcon(); qe/5'dw  
 return res; |h6, .#n  
} 8%p+:6kP5  
xl Q]"sm1  
void CCaptureDlg::AddIcon() !&5|:96o  
{ +_jM$?:F}  
 NOTIFYICONDATA data; {\X$vaF  
 data.cbSize=sizeof(NOTIFYICONDATA); iFZ.a.NDc  
 CString tip; ";^_[n  
 tip.LoadString(IDS_ICONTIP); AC!yc(^<  
 data.hIcon=GetIcon(0); qcge#S>  
 data.hWnd=GetSafeHwnd(); k> ~D  
 strcpy(data.szTip,tip); > w SI0N  
 data.uCallbackMessage=IDM_SHELL; C3~O6<,Jh  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; PKd'lo  
 data.uID=98; r.c:QY$  
 Shell_NotifyIcon(NIM_ADD,&data); ~du U& \  
 ShowWindow(SW_HIDE); dj}|EW4  
 bTray=TRUE; 'j!n   
} nRT ]oAi  
olKM0K  
void CCaptureDlg::DeleteIcon() [zSt+K;  
{ O\6gw$  
 NOTIFYICONDATA data; 2`A[<S  
 data.cbSize=sizeof(NOTIFYICONDATA); ,W;|K 5  
 data.hWnd=GetSafeHwnd(); 7 0EH~  
 data.uID=98; d%K{JkD-  
 Shell_NotifyIcon(NIM_DELETE,&data); 8idIJm%y  
 ShowWindow(SW_SHOW); 4YoQ*NQw-  
 SetForegroundWindow(); M.bkFuh  
 ShowWindow(SW_SHOWNORMAL); e [6F }."c  
 bTray=FALSE; '8FHn~F  
} #w8.aNU+]  
h iK}&  
void CCaptureDlg::OnChange() EVE"F'Ww,_  
{ b5ul|p  
 RegisterHotkey(); rq1zvuUx  
} cob??|,\m  
yo%Nz"  
BOOL CCaptureDlg::RegisterHotkey() L\!Oj5  
{ K@Xj)  
 UpdateData(); Bwu?DK  
 UCHAR mask=0; wA6E7vi'  
 UCHAR key=0; 2fNNdxdbT  
 if(m_bControl) d(Hqj#`-31  
  mask|=4; ` k(Q:  
 if(m_bAlt) .~TI%&#  
  mask|=2; ltMcEv-d0  
 if(m_bShift) }*O8]lG  
  mask|=1; ZI8@ 6L\  
  key=Key_Table[m_Key.GetCurSel()]; lR mVeq:  
 if(bRegistered){ (f~}5O<  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Kaaz,C.$^  
  bRegistered=FALSE; :nfy=*M#  
 }  *I}_g4  
 cMask=mask; 2izBB,# "  
 cKey=key; bH:C/P<x  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ;e9&WEG_\  
 return bRegistered; kuq&; uk$Q  
} 8i<]$  
; 7QG]JX  
  四、小结 D9hq$?  
f zL5C2d  
  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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