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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: skSs|slp  
  Gz09#nFZk  
  一、实现方法 C6<*'5T  
~%gO+qD  
  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: SK][UxoHm  
Wb)>APL  
#pragma data_seg("shareddata") /kZ{+4M  
HHOOK hHook =NULL; //钩子句柄 S<Rl?El<=  
UINT nHookCount =0; //挂接的程序数目 'J[ n}r  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 rHSA5.[1P  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ;7/ ;4Z  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Wnf3[fV6P  
static int KeyCount =0; gC/~@Z8W]  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 yiT)m]E d  
#pragma data_seg() TK! D=M  
uGo tXb  
  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。 C4,;l^?=%  
NI<;Lm  
  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: &<Iyb}tA?  
`qXCY^BH2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 8?yRa{'"  
cKey,UCHAR cMask) WSi`KNX  
{ :NCY6? [Dz  
 BOOL bAdded=FALSE; ?v5OUmFM  
 for(int index=0;index<MAX_KEY;index++){ OCX>LK!K  
  if(hCallWnd[index]==0){ YZ0y_it)  
   hCallWnd[index]=hWnd; \Ei(HmEU  
   HotKey[index]=cKey; bY@ S[  
   HotKeyMask[index]=cMask; 4hQ.RO  
   bAdded=TRUE; JkfVsmc<{h  
   KeyCount++; # .j[iN :+  
   break; JXhHitUD  
  } (7zdbJX  
 } K-<kp!v  
 return bAdded; ^Fop/\E  
} ?^X e^1(  
//删除热键 ^i;y2c  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *m>XtBw.  
{ jIvSjlmI  
 BOOL bRemoved=FALSE; O,D/& 0  
 for(int index=0;index<MAX_KEY;index++){ M "W~%   
  if(hCallWnd[index]==hWnd){ $E >)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ u*h+ c8|zI  
    hCallWnd[index]=NULL; {e/6iSpT  
    HotKey[index]=0; U=Hx&g  
    HotKeyMask[index]=0; hRc.^"q9  
    bRemoved=TRUE; Y-ZTv(<  
    KeyCount--; Bu{1^g:  
    break; (>)f#t[9J  
   } 7^hwRZJ{  
  } ~#]$YoQ&O  
 } %C1*`"Jb&  
 return bRemoved; ZH s' #  
} <T^:`p/]4  
I\y=uC  
[V2`t'  
  DLL中的钩子函数如下: 8T]x4JQ0  
)@hG#KMK  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3;E,B7,mQ  
{ fGf C[DuY  
 BOOL bProcessed=FALSE; \9Yc2$dY  
 if(HC_ACTION==nCode) =rL^^MZp  
 { ^#0k\f>_  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 P;8D|u^\*  
   switch(wParam) Shag4-*@hi  
   {  v:xfGA nP  
    case VK_MENU: ^_0l(ke  
     MaskBits&=~ALTBIT; Cju%CE3a  
     break; tqMOh R  
    case VK_CONTROL: Z\ 1wEGP7{  
     MaskBits&=~CTRLBIT; um5n3=K  
     break; h ycdk1SN  
    case VK_SHIFT: QPZ|C{Ce  
     MaskBits&=~SHIFTBIT; :enmMB#%  
     break; ? CabVj-r  
    default: //judge the key and send message 7[/1uI9U8K  
     break; 7j//x Tr}a  
   } CHGV1X,  
   for(int index=0;index<MAX_KEY;index++){ xlHC?d0}  
    if(hCallWnd[index]==NULL) 3[T<pAZ  
     continue; O9/7?"l"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]ysEj3  
    { jWE?$r"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); wMx# dP4W8  
     bProcessed=TRUE; oBpoZ @[Z  
    } H}f} Y8J{  
   } i| /EA7  
  } Jmcf9g  
  else if((lParam&0xc000ffff)==1){ //有键按下 Z{p)rscX  
   switch(wParam) vi8)U]6  
   { HuRq0/"  
    case VK_MENU: QVq+';cG  
     MaskBits|=ALTBIT; /t $J<bU  
     break; ch-.+p3  
    case VK_CONTROL: 49Y_ze6L}  
     MaskBits|=CTRLBIT; 0D Q\akh  
     break; >I&'Rj&Mc  
    case VK_SHIFT: B{dR/q3;@  
     MaskBits|=SHIFTBIT; xA7Aw0  
     break; c:OFBVZ   
    default: //judge the key and send message cZFG~n/  
     break; s<hl>vY_'  
   } = VFPZ  
   for(int index=0;index<MAX_KEY;index++){ ~ MZEAY9  
    if(hCallWnd[index]==NULL) *$6dNx  
     continue; a}#8n^2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D>>?8a  
    { fa:V8xa  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ji] H|  
     bProcessed=TRUE; &X`zk  
    } LagHzCB  
   } [>#@?@x`P  
  } rq]zt2  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 fk)5TPc^  
   for(int index=0;index<MAX_KEY;index++){ EW}7T3g  
    if(hCallWnd[index]==NULL)  tOEY|  
     continue; fvH4<c5x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \])-Bp ,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ob(S/t  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 +jifbf-  
   } f*HEw  
  } 'G>gNq  
 } (h $[g"8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); i7#PYt  
} Q}qw` L1  
O% }EpIP_  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: K|Kc.   
M0$wTmXM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #eZm)KFQg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [i 7^a/e  
Zp'q;h_  
  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: K>_~zWnc  
 |tVWmm^m  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *F)+- BB  
{ J4VyP["m  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 552U~t  
 { vk>EFm8l  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 )i$:iI >k  
  SaveBmp(); D$&LCW#x  
  return FALSE; Lo-\;%y  
 } iFBH;O_~  
 …… //其它处理及默认处理 _O w]kP='  
} (t%+Z"j  
F&[MyXU4  
3~5 %6`  
  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。 N{<9N jmm  
I4RUXi 5  
  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。 |vVcO  
|Js?@  
  二、编程步骤 M"l<::z  
<JkmJ/X  
  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"; PS\n0  
8V f]K}d  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; fHc/5uYW  
[e.@Yx_}  
  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; rfwX:R6,g  
k'b'Ay(<  
  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; j7u\.xu9  
hxX-iQya  
  5、 添加代码,编译运行程序。 g71|t7Q  
16Gp nb  
三、程序代码 1*vt\,G  
h^aUVuL/  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 2nsW)bd  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) YVT\@+C'  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ %!HBPLk  
#if _MSC_VER > 1000 3^x C=++  
#pragma once 66jL2XU<  
#endif // _MSC_VER > 1000 PZB_6!}2[F  
#ifndef __AFXWIN_H__ *$/!.e  
#error include 'stdafx.h' before including this file for PCH iM'rl0  
#endif V 'e _gH  
#include "resource.h" // main symbols eJ2$DgB}t  
class CHookApp : public CWinApp /GUbc   
{ s^6"qhTa  
 public: SGK=WLGM8  
  CHookApp(); azT@S=,  
  // Overrides ]Ac&h aAP  
  // ClassWizard generated virtual function overrides -!JnyD   
  //{{AFX_VIRTUAL(CHookApp) GDBxciv  
 public: 3g''j7  
  virtual BOOL InitInstance(); c*:H6(u  
  virtual int ExitInstance(); ?jy6%Y#,i  
  //}}AFX_VIRTUAL ek9Y9eJ"  
  //{{AFX_MSG(CHookApp) uL1$yf'  
  // NOTE - the ClassWizard will add and remove member functions here. |o0?u:  
  // DO NOT EDIT what you see in these blocks of generated code ! ,LpGE>s  
  //}}AFX_MSG P{tH4V23T  
  DECLARE_MESSAGE_MAP() 1,pg7L8H  
}; ^+b ??K  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); tuWJj^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); WiBO8N,%`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); pjaDtNb  
BOOL InitHotkey(); )cUFb:D*"  
BOOL UnInit(); >ngP\&\  
#endif 8<X,6  
!hS~\+E  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 5L%\rH&N  
#include "stdafx.h" s J~WzQ  
#include "hook.h" 2C@s-`b   
#include <windowsx.h> kntM  
#ifdef _DEBUG .*acw  
#define new DEBUG_NEW x+B7r& #:  
#undef THIS_FILE )xPfz  
static char THIS_FILE[] = __FILE__; f.X<Mo   
#endif e/* T,ZJ  
#define MAX_KEY 100 8"5^mj  
#define CTRLBIT 0x04 %V2A}78  
#define ALTBIT 0x02 hErO.ad1o  
#define SHIFTBIT 0x01 [\ALT8vC?m  
#pragma data_seg("shareddata") E%tGwbi7  
HHOOK hHook =NULL; *~H\#N|x  
UINT nHookCount =0; W2 p&LP  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey b0n " J`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT %M KZ':m  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey I%qZMoS1h  
static int KeyCount =0; !T3b ]0z  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 0'Y'K6hG`  
#pragma data_seg() @GrQ /F7  
HINSTANCE hins; z3+7gp+I;  
void VerifyWindow(); i<ug("/  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) <f+ 9wuZ  
//{{AFX_MSG_MAP(CHookApp) WD${f#]N  
// NOTE - the ClassWizard will add and remove mapping macros here. hNWZ1r~_  
// DO NOT EDIT what you see in these blocks of generated code! $V?h68[c  
//}}AFX_MSG_MAP =MCQNyf+  
END_MESSAGE_MAP() pjVF^gv,*  
[n!5!/g>j  
CHookApp::CHookApp() XI"8d.VR  
{ [Kc"L+H\  
 // TODO: add construction code here, &]xOjv/?  
 // Place all significant initialization in InitInstance I&lb5'6D  
} ^w1&A 3=6  
`of` uB  
CHookApp theApp; ;5TQH_g  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) m(6SiV=D9  
{ jXu)%<  
 BOOL bProcessed=FALSE; /CW 0N@  
 if(HC_ACTION==nCode) : #om6}   
 { {@tqeu%IM  
  if((lParam&0xc0000000)==0xc0000000){// Key up 2$OI(7b=  
   switch(wParam) KDQqN]rg  
   { /yhGc}h  
    case VK_MENU: Jq8CII  
     MaskBits&=~ALTBIT; 'L1=:g.\i  
     break; tITx+i  
    case VK_CONTROL: A.@/~\  
     MaskBits&=~CTRLBIT; yR|Beno  
     break; EJ&aT etQ  
    case VK_SHIFT: nz%{hMNYH  
     MaskBits&=~SHIFTBIT; zUNWcv!& "  
     break; l%^VBv> 2  
    default: //judge the key and send message 0[SJ7k19  
     break; S]#xG+$<  
   } oMNgyAp^  
   for(int index=0;index<MAX_KEY;index++){ &R7N^*He  
    if(hCallWnd[index]==NULL) \ f6@B:?y  
     continue; t<%S_J\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) q5D_bm7,3  
    { `mt. =d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); EqB3f_  
     bProcessed=TRUE; G{C27k>wa  
    } J/ ! Mt  
   } %DqPRl.Gu  
  }  I0v$3BQ4  
  else if((lParam&0xc000ffff)==1){ //Key down [@RJ2q$  
   switch(wParam) N~/D| ?P~2  
   { NrTK+6 z  
    case VK_MENU: 1>wQ&{  
     MaskBits|=ALTBIT; ^P| K2at  
     break; WhU-^`[*  
    case VK_CONTROL: ZBX,4kxK7  
     MaskBits|=CTRLBIT; YN<:k Wu  
     break; *pMu,?uE  
    case VK_SHIFT: <XAW-m9SC  
     MaskBits|=SHIFTBIT; W{6%Hh p  
     break; <R%]9#re  
    default: //judge the key and send message |5(< Vk=  
     break; D6wg^ 'Q:  
   } {TV6eV  
   for(int index=0;index<MAX_KEY;index++) Ny oRp  
   { F9Y/Z5 Ea  
    if(hCallWnd[index]==NULL) SA1| 7  
     continue; p l.D h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cI g|sn  
    { [LcHO] _^M  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =%UX"K`  
     bProcessed=TRUE; :% o32  
    } `_*NFv1_  
   } K@DK4{  
  } gr%!<2w  
  if(!bProcessed){ 0 jszZ_  
   for(int index=0;index<MAX_KEY;index++){ O5;$cP:  
    if(hCallWnd[index]==NULL) luYa+E0  
     continue; fsr0E=nV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  | D?lF  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); a`:ag~op@&  
   } ;K+'J0  
  } a*fUMhIi  
 } vxmz3ht,Q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); OB&lq.r  
} Cc7YjsRW  
JC[G5$E  
BOOL InitHotkey() K}(0H[P  
{ _r6aLm2n  
 if(hHook!=NULL){ S9'8rn!_  
  nHookCount++; $cUTe  
  return TRUE; /N'|Vs,X  
 } l_`DQ8L`  
 else >#j f Z5t  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); R"0fZENTG  
  if(hHook!=NULL) 9*"Ae0ok1  
   nHookCount++; YH%aPsi  
  return (hHook!=NULL); T9,T'y>BD  
} oK!W<#  
BOOL UnInit() zURob MpE#  
{ 6)QJms  
 if(nHookCount>1){ 'W>Zr}:  
  nHookCount--; p? q~.YY  
  return TRUE; T{VdlgL  
 } E(l'\q'.  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ELlTR/NW  
 if(unhooked==TRUE){ GG KD8'j]  
  nHookCount=0; pjh o#yP  
  hHook=NULL; Tn'_{@E;  
 } Gxj3/&]^Y  
 return unhooked; $G_,$U !  
} HalkNR-eEm  
?3vOc/2@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) iHp@R-g  
{ ATdK)gG  
 BOOL bAdded=FALSE; 0A7 qO1%xw  
 for(int index=0;index<MAX_KEY;index++){ 2?)bpp$WZ  
  if(hCallWnd[index]==0){ xq.HR_\  
   hCallWnd[index]=hWnd; rTR4j>Ua~  
   HotKey[index]=cKey; Ai 9UB=[R  
   HotKeyMask[index]=cMask; 6jGPmOM/  
   bAdded=TRUE; U6R"eQUTV  
   KeyCount++; vXio /m  
   break; 6axDuwQ  
  } Ckelr  
 } 7i,Z c]  
 return bAdded; 2L'vB1 `  
} wGXnS"L!  
8\85Wk{b  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [ NSsT>C  
{ c2,1d`  
 BOOL bRemoved=FALSE; ^YpA@`n  
 for(int index=0;index<MAX_KEY;index++){ bg8<}~zg  
  if(hCallWnd[index]==hWnd){ `?X=@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )AX0x1I|E  
    hCallWnd[index]=NULL; PhS`,I^Z  
    HotKey[index]=0; NVTNjDF%s  
    HotKeyMask[index]=0; cvf@B_iN9  
    bRemoved=TRUE; <N Lor55.]  
    KeyCount--; $SP*hkU  
    break; ]T3dZ`-(  
   } 0S{dnp  
  } J5J$qCJq  
 } }Z|uLXaz  
 return bRemoved; xKKR'v:o\  
} T%%+v#+  
E>BP b  
void VerifyWindow() qrFC4\q}  
{ b :Knc$  
 for(int i=0;i<MAX_KEY;i++){ $7#N@7  
  if(hCallWnd!=NULL){ Bhy:" r%#  
   if(!IsWindow(hCallWnd)){ $9}z^sGIM  
    hCallWnd=NULL; P&ig.Og*  
    HotKey=0; ?H c~ 3  
    HotKeyMask=0; d" "GG/  
    KeyCount--; IQZBH2R  
   } ]aqHk  
  } Qo4+=^(  
 } k{fCU%  
} z)Y<@2V*C  
&IQp&  
BOOL CHookApp::InitInstance() $uA?c& e  
{ )-_NtMr~`!  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); sGf\!w  
 hins=AfxGetInstanceHandle(); iaqhP7!  
 InitHotkey(); \LFRu  
 return CWinApp::InitInstance(); q/o|uAq  
} T:$zNX<f  
*3yeMxa  
int CHookApp::ExitInstance()  Yfk){1  
{ 5$r`e+Nf'  
 VerifyWindow(); kKFSCl/g  
 UnInit(); 6AZJ,Q\E@  
 return CWinApp::ExitInstance(); ]7QRelMiz+  
} X(-e-:B4;  
Y* #'Gh,  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file kAbkhZ1^  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) z2m%L0  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ %SRUHx[D  
#if _MSC_VER > 1000 _)J;PbK~  
#pragma once +F &,,s"&  
#endif // _MSC_VER > 1000 %!r>]M <  
#?xhfSgr  
class CCaptureDlg : public CDialog RLypWjMx$  
{ FuOP+r!H  
 // Construction Lx-ofN\  
 public: 05(lh<C  
  BOOL bTray; \#(cI  
  BOOL bRegistered; ; &2J9  
  BOOL RegisterHotkey(); n7 RswX  
  UCHAR cKey; `?P k~7  
  UCHAR cMask; U _~lpu  
  void DeleteIcon(); 73$^y)AvY  
  void AddIcon(); 4:\s.Z{!3  
  UINT nCount; r( _9_%[  
  void SaveBmp(); Gy9+-7"V  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor uiO7sf6  
  // Dialog Data W;]*&P[[   
  //{{AFX_DATA(CCaptureDlg) dbTPY`  
  enum { IDD = IDD_CAPTURE_DIALOG }; ubV|s|J  
  CComboBox m_Key; `;7^@k  
  BOOL m_bControl; 8>Xyz`$kH  
  BOOL m_bAlt; }5H3DavW  
  BOOL m_bShift; Q 'R@'W9  
  CString m_Path; *p;Fwj]  
  CString m_Number; N[ %^0T$  
  //}}AFX_DATA K/Q^8%Z  
  // ClassWizard generated virtual function overrides aOq>Ra{T  
  //{{AFX_VIRTUAL(CCaptureDlg) .+<Ul ]e/  
 public: T}(J`{ 9i  
  virtual BOOL PreTranslateMessage(MSG* pMsg); .6%-Il  
 protected: =,0E]M Z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support QN_Zd@K*A  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); @ 8yV15!  
  //}}AFX_VIRTUAL Egv (n@1  
  // Implementation 8LP L4l  
 protected: _ x&Y'X|  
  HICON m_hIcon; 8(UUc>g  
  // Generated message map functions R07Kure  
  //{{AFX_MSG(CCaptureDlg) w/r wE  
  virtual BOOL OnInitDialog(); U2=l; R{  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ,K Ebnk|i  
  afx_msg void OnPaint();  Z(p kj  
  afx_msg HCURSOR OnQueryDragIcon(); }EmNSs`$r  
  virtual void OnCancel(); 6P=6E   
  afx_msg void OnAbout(); VLW<"7I 6\  
  afx_msg void OnBrowse(); 0c4H2RW  
  afx_msg void OnChange(); _tZT  
 //}}AFX_MSG WL4{_X  
 DECLARE_MESSAGE_MAP() f&glY`s#  
}; `;-K/)/x  
#endif "?|sC{'C4j  
+0mU)4n/  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file  4I7}  
#include "stdafx.h" nwh7DU i  
#include "Capture.h" F}P+3IaE  
#include "CaptureDlg.h" [*U6L<JI  
#include <windowsx.h> T]d9tX-  
#pragma comment(lib,"hook.lib") h#9X0u7j  
#ifdef _DEBUG [z$th  
#define new DEBUG_NEW Z@fMU2e=Z  
#undef THIS_FILE 2xvTijO0  
static char THIS_FILE[] = __FILE__; !|{T>yy  
#endif 6q ._8%  
#define IDM_SHELL WM_USER+1 [psW+3{bG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w-l:* EV8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); yTWP1  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; )Xxu-/-  
class CAboutDlg : public CDialog !6: kJL}U  
{ RiC1lCE  
 public: LutP&Ebt8  
  CAboutDlg(); "ewSh<t  
  // Dialog Data Fyy)665x/  
  //{{AFX_DATA(CAboutDlg) A+*M<W  
  enum { IDD = IDD_ABOUTBOX }; !6hUTjhW7z  
  //}}AFX_DATA _,:gSDW|  
  // ClassWizard generated virtual function overrides VSa\X~  
  //{{AFX_VIRTUAL(CAboutDlg) ?sV0T)uk  
 protected: ,$ L>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )%lPa|7s  
  //}}AFX_VIRTUAL [V_Z9-f*  
  // Implementation bhaIi>W~G  
 protected: K^j7T[pR  
  //{{AFX_MSG(CAboutDlg) \EF^Ag  
  //}}AFX_MSG 4$ LVl  
  DECLARE_MESSAGE_MAP() '+LbFGrO3  
}; ca/AScL  
BwwOaO@L  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) SW|{)L,  
{ 25%[nkO4  
 //{{AFX_DATA_INIT(CAboutDlg) [F4] pR(  
 //}}AFX_DATA_INIT fQcJyX  
} CAdqoCz|  
S%zn {1F  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) T9.3  
{ $eUI.j(HU  
 CDialog::DoDataExchange(pDX); $_NYu  
 //{{AFX_DATA_MAP(CAboutDlg) K[JbQ30  
 //}}AFX_DATA_MAP 5 s3!{zT{  
} 5[3vu p?  
a"gZw9m@  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) H1iewsfzH  
 //{{AFX_MSG_MAP(CAboutDlg) U_ELeW5@  
 // No message handlers >5Y%4++(  
 //}}AFX_MSG_MAP  ,83%18b  
END_MESSAGE_MAP() ?5(Cwy ?  
T$[50~  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) w.w(*5[  
: CDialog(CCaptureDlg::IDD, pParent) !5lb+%7  
{ g,Z8I;A^  
 //{{AFX_DATA_INIT(CCaptureDlg) (Tt\6-  
  m_bControl = FALSE; CX/ _\0 G4  
  m_bAlt = FALSE; d>[=]  
  m_bShift = FALSE; H/"$#8-/  
  m_Path = _T("c:\\"); Q-<N)K$F(4  
  m_Number = _T("0 picture captured."); ayR=GqZ1  
  nCount=0; 3Au3>q,  
  bRegistered=FALSE; SPfz/ q{  
  bTray=FALSE; W]b>k lp;  
 //}}AFX_DATA_INIT m{T:<:q~  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ,MH/lQq%  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); JmL{&  
} *HiN:30DZ  
wq$+m (  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?:DeOBAb  
{ KQGdV{VFs  
 CDialog::DoDataExchange(pDX); j4pxu/2  
 //{{AFX_DATA_MAP(CCaptureDlg) ,*_=w^;Rr  
  DDX_Control(pDX, IDC_KEY, m_Key); 6 axe  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); yOHVL~F  
  DDX_Check(pDX, IDC_ALT, m_bAlt); s6=jHrdvv  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); GH ] c  
  DDX_Text(pDX, IDC_PATH, m_Path); [t #xX59  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 8NCu;s  
 //}}AFX_DATA_MAP !R@v\Eu  
} (55k70>i3  
WbF[4 x  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 6! `^}4  
//{{AFX_MSG_MAP(CCaptureDlg) #Bu W  
 ON_WM_SYSCOMMAND() h=:Ls]ZU  
 ON_WM_PAINT() FfEP@$  
 ON_WM_QUERYDRAGICON() CshYUr -  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) b ]A9$-  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) WBc,/lgZ  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ux>wa+XFa  
//}}AFX_MSG_MAP ->"Z1  
END_MESSAGE_MAP() `^_c&y K  
2z*EamF  
BOOL CCaptureDlg::OnInitDialog() 3vdhoS|  
{ B?M&j  
 CDialog::OnInitDialog(); +% E)]*Ym  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); {v3?.a$ u  
 ASSERT(IDM_ABOUTBOX < 0xF000); P _e9>t@  
 CMenu* pSysMenu = GetSystemMenu(FALSE); >+}yI}W;e  
 if (pSysMenu != NULL) E}-Y!,v^  
 { Lt'FA  
  CString strAboutMenu; LT+QW  
  strAboutMenu.LoadString(IDS_ABOUTBOX); =(]yl_  
  if (!strAboutMenu.IsEmpty()) s}w?Dvo\  
  { AN)exU ?  
   pSysMenu->AppendMenu(MF_SEPARATOR); Bh<DqN  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); _m0B6?KJ  
  } Ht`kmk;I)  
 }  ylTX  
 SetIcon(m_hIcon, TRUE); // Set big icon r@WfZ  Z  
 SetIcon(m_hIcon, FALSE); // Set small icon ]*/%5ZOI&  
 m_Key.SetCurSel(0); 2Q bCH}  
 RegisterHotkey(); P]h-**O  
 CMenu* pMenu=GetSystemMenu(FALSE); g/3t@7*<  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); <D}yqq@|  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); |FED<  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 4eD>DW  
 return TRUE; // return TRUE unless you set the focus to a control QYB66g:  
} qS|ns'[  
UO~Xzx!e  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) /9QC$Z):<  
{ /&>vhpZ}  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) X0FTD':f  
 { 8%\0v?a5  
  CAboutDlg dlgAbout; p)&Yr  
  dlgAbout.DoModal(); 8bTE# 2+-  
 } vyS8yJUY  
 else H;D CkVL  
 { Al}D~6MD  
  CDialog::OnSysCommand(nID, lParam); Sv#S_jh  
 } b=$(`y  
} UiE 1TD{  
Bjc<d,]  
void CCaptureDlg::OnPaint() \bXusLI!l  
{ (JX 9c  
 if (IsIconic()) /^M|$JRI  
 { {e]ktj#+{  
  CPaintDC dc(this); // device context for painting ;N(9nX}%)  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 7gnrLc$]O  
  // Center icon in client rectangle U*Sjb% Qb  
  int cxIcon = GetSystemMetrics(SM_CXICON); r)]8zK4;=  
  int cyIcon = GetSystemMetrics(SM_CYICON); #_pQS}$  
  CRect rect; jA' 7@/F/  
  GetClientRect(&rect); lnQfpa8j  
  int x = (rect.Width() - cxIcon + 1) / 2; ^.g BHZ  
  int y = (rect.Height() - cyIcon + 1) / 2; UlD]!5NO  
  // Draw the icon  I?R?rW  
  dc.DrawIcon(x, y, m_hIcon); bnzIDsw!Q  
 } !,Uzt1K:  
 else v\ <4y P  
 { O[<YYL 0  
  CDialog::OnPaint(); e8,!x9%J  
 } )<K3Fz Bs  
} ; 8B )J<y  
Oj]4jRew  
HCURSOR CCaptureDlg::OnQueryDragIcon() ~TfN*0  
{  8 ?4/  
 return (HCURSOR) m_hIcon; s2kom)  
} :ceT8-PBRx  
Va-.  
void CCaptureDlg::OnCancel() 1e)5D& njS  
{ `:*O8h~i^8  
 if(bTray) L"[>tY  
  DeleteIcon(); 3uy^o  
  CDialog::OnCancel(); W*WSjuFr2  
} J#) %{k_  
X%R)  
void CCaptureDlg::OnAbout() ^3O`8o  
{ i5; _  
 CAboutDlg dlg; wQw&.)T  
 dlg.DoModal(); T`W37fz0  
} 6` 4,  
phP%  
void CCaptureDlg::OnBrowse() =IEei{  
{ c[zGWF#1>  
 CString str; w|[{xn^R  
 BROWSEINFO bi; LXq0hI  
 char name[MAX_PATH]; S4C4_*~Vd  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); njGZ#{"eC  
 bi.hwndOwner=GetSafeHwnd(); q]rqFP0C  
 bi.pszDisplayName=name; e13' dCG  
 bi.lpszTitle="Select folder"; 78h!D[6  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; %pUA$oUt  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); J`'wprSBb  
 if(idl==NULL) h=o%\F4  
  return; #q9cjEd_7  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); .vov ,J!Y  
 str.ReleaseBuffer(); ,8&ND864v  
 m_Path=str; #!7b3>}  
 if(str.GetAt(str.GetLength()-1)!='\\') Aq,&p,m03  
  m_Path+="\\"; fqm-?vy}  
 UpdateData(FALSE); *5z"Xy3J  
} K06x7W  
As+^6  
void CCaptureDlg::SaveBmp() 9R3YUW}s  
{ %T,cR>lw  
 CDC dc; tdOox87YK  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); .`~=1 H\R"  
 CBitmap bm; ?656P=b)  
 int Width=GetSystemMetrics(SM_CXSCREEN); /D,<2>o  
 int Height=GetSystemMetrics(SM_CYSCREEN); Z"N}f ,  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Z@gEJ^"yA"  
 CDC tdc; (Y~gItej  
 tdc.CreateCompatibleDC(&dc); FB }8  
 CBitmap*pOld=tdc.SelectObject(&bm); 8Y P7'Fz  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); c +N\uG4  
 tdc.SelectObject(pOld); !n`Y^  
 BITMAP btm; xY@<<  
 bm.GetBitmap(&btm); n_eN|m?@  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ftRzgW);  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); gxCl=\  
 BITMAPINFOHEADER bih; W.7XShwd*2  
 bih.biBitCount=btm.bmBitsPixel; XGSgx  
 bih.biClrImportant=0; WKB K)=  
 bih.biClrUsed=0; 2@>#?c7  
 bih.biCompression=0; LB/1To  
 bih.biHeight=btm.bmHeight; 8],tGMu  
 bih.biPlanes=1; It8s#oq8  
 bih.biSize=sizeof(BITMAPINFOHEADER); -`ss7j&b3  
 bih.biSizeImage=size; Co^GsUJ  
 bih.biWidth=btm.bmWidth; 0I7 r{T  
 bih.biXPelsPerMeter=0; cL^r^kL("  
 bih.biYPelsPerMeter=0; I`uOsZBO/  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _5H0<%\  
 static int filecount=0; UE 1tm  
 CString name; 3)3$ L  
 name.Format("pict%04d.bmp",filecount++); J{r3y&:  
 name=m_Path+name; v O@7o  
 BITMAPFILEHEADER bfh; CH] +S>$  
 bfh.bfReserved1=bfh.bfReserved2=0; qrkJ:  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ~mk>9Gp  
 bfh.bfSize=54+size; #sb@)Q  
 bfh.bfOffBits=54; 6I-Qq?L[H  
 CFile bf; =@s{H +  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Q+zy\T  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); J?oEzf;M  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); aB2t/ua  
  bf.WriteHuge(lpData,size); !"bU|a  
  bf.Close(); Ak+MR EG  
  nCount++; g&fq)d  
 } <4RP:2#  
 GlobalFreePtr(lpData); sG:tyvln  
 if(nCount==1) A ^X1  
  m_Number.Format("%d picture captured.",nCount); H'x) [2  
 else Q)93 +1]  
  m_Number.Format("%d pictures captured.",nCount); W3]?>sLE*  
  UpdateData(FALSE); 6GsB*hW  
} 2<TpNGXM_  
U$EQeb  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]_mcJ/6:  
{ gmdA1$c  
 if(pMsg -> message == WM_KEYDOWN) >L,Pw1Y0W[  
 { VdF<#(X+  
  if(pMsg -> wParam == VK_ESCAPE) 25/M2u?  
   return TRUE; ?;ovh nY)  
  if(pMsg -> wParam == VK_RETURN) 4N_iHe5U  
   return TRUE; g$^I/OK?  
 } U^d!*9R  
 return CDialog::PreTranslateMessage(pMsg); =m/BH^|&W  
} *5q_fO  
w~Jy,[@n  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) k@9CDwh*s  
{ sg8j}^VI  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ WNo<0|X  
  SaveBmp(); sO 0j!;N  
  return FALSE; '=cAdja  
} !xz{X?  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Y%#r&de  
 CMenu pop; Cd'K~Ch3  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); b&I{?'"%8  
 CMenu*pMenu=pop.GetSubMenu(0); mM\jU5P:^  
 pMenu->SetDefaultItem(ID_EXITICON); hDD]Kc;G^1  
 CPoint pt; O[\obi"}  
 GetCursorPos(&pt); ;]Ko7M(4  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); \!s0H_RJY  
 if(id==ID_EXITICON) hg+0!DVx  
  DeleteIcon(); OJXK]dZ  
 else if(id==ID_EXIT) ySNXjH Q=  
  OnCancel(); cp L'  
 return FALSE; K%(DRkj)  
} w ?"s6L3  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); <gjA(xT5  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) v|GDPq  
 AddIcon(); 2_ CJV  
 return res; 4j}uVGi{e  
} ?vV&tqnx%  
^8{:RiN6e~  
void CCaptureDlg::AddIcon() i~uoK7o|G  
{ ]=jpqxlx  
 NOTIFYICONDATA data; 0` UrB:  
 data.cbSize=sizeof(NOTIFYICONDATA); DW0UcLO  
 CString tip; DRmN+2I  
 tip.LoadString(IDS_ICONTIP); }D*5PV%d  
 data.hIcon=GetIcon(0); ,xuA%CF-S  
 data.hWnd=GetSafeHwnd(); %-#rzeaW  
 strcpy(data.szTip,tip); f]DO2 r  
 data.uCallbackMessage=IDM_SHELL; $uCY\ xqZ  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ZGC*BP/  
 data.uID=98; >NAg*1  
 Shell_NotifyIcon(NIM_ADD,&data); /4Jm]"  
 ShowWindow(SW_HIDE); f~v@;/HL  
 bTray=TRUE; nW!pOTJq21  
} &ngG_y8}&  
M}qrF~   
void CCaptureDlg::DeleteIcon() d D;r35h=  
{ ">!<OB  
 NOTIFYICONDATA data; o 76QQ+hP  
 data.cbSize=sizeof(NOTIFYICONDATA); OE5JA8/H  
 data.hWnd=GetSafeHwnd(); [hXnw'Im/  
 data.uID=98; )=6o  ,  
 Shell_NotifyIcon(NIM_DELETE,&data); #({ 9M  
 ShowWindow(SW_SHOW); Gu5%Pou  
 SetForegroundWindow(); Z{rD4S @^  
 ShowWindow(SW_SHOWNORMAL); ,Ep41v;T%`  
 bTray=FALSE; LRKl3"M  
} CINC1Ll_24  
y4`uU1=  
void CCaptureDlg::OnChange() )~=g}&  
{ N^xk.O_TO  
 RegisterHotkey(); AlhPT (  
} P= nu&$;  
]2@g 5H}M  
BOOL CCaptureDlg::RegisterHotkey() * $v`5rP  
{ tP0!TkTo9  
 UpdateData(); hp!. P1b  
 UCHAR mask=0; ]97`=,OUg  
 UCHAR key=0; 'X/(M<c  
 if(m_bControl) #/2W RN1L  
  mask|=4; XS`=8FQ  
 if(m_bAlt) $p~X"f?0  
  mask|=2; {p)=#Jd`.P  
 if(m_bShift) 2y@y<38  
  mask|=1; N]7#Q.(~  
  key=Key_Table[m_Key.GetCurSel()]; 0uwe,;   
 if(bRegistered){ Y0ouLUlI  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); \p{$9e;8yT  
  bRegistered=FALSE; ^>tqg^  
 } o.x<h";  
 cMask=mask; Nc[[o>/Cb  
 cKey=key; IM*T+iRKqF  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); YCS8qEP&  
 return bRegistered; j6r.HYX!  
} I>(-&YbC  
>w)A~ F<  
  四、小结 x'hUw*  
PBY ^m+  
  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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