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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: g<-cHF  
  U#P#YpD;==  
  一、实现方法 J.d `tiN  
;vx9xs?6  
  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: lo#,zd~  
PTh Ya  
#pragma data_seg("shareddata") rG]Xgq"   
HHOOK hHook =NULL; //钩子句柄 x@ O:  
UINT nHookCount =0; //挂接的程序数目 xl^'U/  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 90!Ib~7zH  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 9.B7Owgr89  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey #Grm-W9E  
static int KeyCount =0; gr=`_k4~1  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 !ZZAI_N  
#pragma data_seg() ao!r6:&v$e  
Fqv5WoYVf  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 [8w2U%}]  
wGH@I_cy>  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: NC}#P< U  
As`^Ku&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR /WfxI>v  
cKey,UCHAR cMask) lUEyo.xVt  
{ c"ztrKQQ  
 BOOL bAdded=FALSE; ^d*>P|n*@e  
 for(int index=0;index<MAX_KEY;index++){ Mm!saKT%  
  if(hCallWnd[index]==0){ 4o3GS8  
   hCallWnd[index]=hWnd; fLAF/#\2  
   HotKey[index]=cKey; *@nUas 2"  
   HotKeyMask[index]=cMask; d#Ajb  
   bAdded=TRUE;  P+0xi  
   KeyCount++; 'r%oOZk)z  
   break; D.b<I79bX  
  } &?6w 2[}  
 } p/~kw:I  
 return bAdded; W\7*T1TDj  
} )[*O^bPowI  
//删除热键 Uj)]nJX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) N}G(pq}  
{ beE%%C]X  
 BOOL bRemoved=FALSE; 3~ZVAg[c  
 for(int index=0;index<MAX_KEY;index++){ `WS_*fJ5  
  if(hCallWnd[index]==hWnd){ (?y2@I}  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ C6~dN& q  
    hCallWnd[index]=NULL; GcW}<g}  
    HotKey[index]=0; I/jr` 3Mj  
    HotKeyMask[index]=0; Y;Gm,  
    bRemoved=TRUE; Zd ,=  
    KeyCount--; w.p'Dpw  
    break; GN c|)$  
   } 9G+rxyWMW  
  } v!A|n3B]p  
 } ZiYzsn  
 return bRemoved; J94YMyOo  
} )fc"])&8  
Po. BcytM  
&Ld8Z9IeFp  
  DLL中的钩子函数如下: Y26l,XIV  
}Xv1KX'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) a&Du5(r;!  
{ P%HyIODS  
 BOOL bProcessed=FALSE; z|)1l`  
 if(HC_ACTION==nCode) >[4|6k|\x  
 { i!x5T%x_  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 9?chCO(@  
   switch(wParam) >Eg. c  
   {  b2%bgs  
    case VK_MENU: <|Eby!KXR  
     MaskBits&=~ALTBIT; 9R"N#w.U]  
     break; n4T2'e  
    case VK_CONTROL: W;]U P$5l  
     MaskBits&=~CTRLBIT; 00a<(sS;  
     break; 0P3|1=  
    case VK_SHIFT: 0lr4d Y  
     MaskBits&=~SHIFTBIT; ^i)Q CDU7  
     break; 42wC."A  
    default: //judge the key and send message =M{CZm  
     break; ?mfWm{QTt  
   } 5>[sCl-  
   for(int index=0;index<MAX_KEY;index++){ 0*/ r'  
    if(hCallWnd[index]==NULL) c&?a ,fpb  
     continue; "|r^l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Hs -.83V  
    { (g2r\hI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  zn;Hs]G  
     bProcessed=TRUE; mYOdBd  
    } I+j|'=M  
   } "q>I?UcZ  
  } Sb9=$0%\  
  else if((lParam&0xc000ffff)==1){ //有键按下 ]op^dW1;0_  
   switch(wParam) r,@X>_}  
   { A.C278^O8  
    case VK_MENU: YEPG[W<kg  
     MaskBits|=ALTBIT; |U$de2LF  
     break; IQi[g~E.5  
    case VK_CONTROL: XvkI +c  
     MaskBits|=CTRLBIT; H0b6ZA%n  
     break; $x_52 j\j  
    case VK_SHIFT: a.&#dxgW[  
     MaskBits|=SHIFTBIT; 3auJ^B}  
     break; CBnouKc:  
    default: //judge the key and send message -=t3O#  
     break; &;h~JS=  
   } Vkvb=  
   for(int index=0;index<MAX_KEY;index++){ &Wz`>qYL*  
    if(hCallWnd[index]==NULL) Q#ZD&RZ9.  
     continue; rq(~/Yc  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) jle%|8m&@  
    { ic0v*Y$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); tC@zM.v%  
     bProcessed=TRUE; |CZnq-,C  
    } +G!jKta7B  
   } /@:up+$  
  } kF+}.x%  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 s{z~Axup-  
   for(int index=0;index<MAX_KEY;index++){ h\u0{!@}  
    if(hCallWnd[index]==NULL) R<lNk<  
     continue; R0hc tT1j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }@:QYTBi }  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); H ?`)[#  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 @( n^S?(  
   } :B*vkwT  
  } C7jc6(> m  
 } ,na=~.0R:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); D-o7yc"K  
} jI{~s]Q  
orB8Q\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: r{q}f)  
1~R$$P11[9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0tW<LR-}E  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,XeyE;||  
iBKb/Oi6  
  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: 62MRI    
oTF^<I-C  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `\/toddUh[  
{ dcl.wD0~V  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 83  i1  
 { 3qAwBVWa  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $>'")7z  
  SaveBmp(); yV J dZI  
  return FALSE; S(>@:`=  
 } 2/v35| ?  
 …… //其它处理及默认处理 $Wr\ [P:  
} `%t$s,TiP  
]DC;+;8Jc  
Ic[}V0dk  
  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。 p{ @CoOn  
XMN?;Hj>  
  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。 xH_A@hf;  
a>wfhmr  
  二、编程步骤 5q|+p?C  
U,Z"G1^  
  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"; u\{qH!?t  
.e`,{G(5q7  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; -A/ds1=;  
w=f0*$ue+w  
  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; )Qh>0T+(  
Qw24/DJK  
  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; "sF Xl  
7"ylN"syZ  
  5、 添加代码,编译运行程序。 AIuMX4nb  
5cD XWF  
三、程序代码 n?'d|h  
[096CK  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ;yF[2P ;  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) u5Qp/ag?N  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ M[ x_#m|  
#if _MSC_VER > 1000 U?bG`. X  
#pragma once M'yO+bu  
#endif // _MSC_VER > 1000 DdBxqkh  
#ifndef __AFXWIN_H__ -#hK|1]  
#error include 'stdafx.h' before including this file for PCH +"'F Be  
#endif WK pUn8&N  
#include "resource.h" // main symbols CV'&4oq  
class CHookApp : public CWinApp %$Aqbd  
{ sz'p3  
 public: vFTXTbt'h  
  CHookApp(); M]c7D`%s  
  // Overrides "37*A<+f  
  // ClassWizard generated virtual function overrides g^1r0.Sp{8  
  //{{AFX_VIRTUAL(CHookApp) YU&4yk lE  
 public: '<TD6jBs  
  virtual BOOL InitInstance(); |Eb&}m:E$  
  virtual int ExitInstance(); Bb~5& @M|N  
  //}}AFX_VIRTUAL 0f1H8zV  
  //{{AFX_MSG(CHookApp) g[M]i6h2  
  // NOTE - the ClassWizard will add and remove member functions here. GE@uO J6H  
  // DO NOT EDIT what you see in these blocks of generated code ! zt?h^zf}  
  //}}AFX_MSG 2xDQ :=ec  
  DECLARE_MESSAGE_MAP() -TgUyv.  
}; B22b&0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); m=H_?W;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); P@C c]Z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *%X.ym'  
BOOL InitHotkey();  =^Th[B  
BOOL UnInit(); Q\|18wkW  
#endif Lx%:t YZ  
M+0x;53nz  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ^p,3)$  
#include "stdafx.h" UxeL cUP  
#include "hook.h" w,Q)@]_  
#include <windowsx.h> N+NK`  
#ifdef _DEBUG 6GzzG P^  
#define new DEBUG_NEW ,ijW(95{k  
#undef THIS_FILE JA<~xo[Q9  
static char THIS_FILE[] = __FILE__; GMdI0jaG#  
#endif KSc~GP _  
#define MAX_KEY 100 @ u+|=x];  
#define CTRLBIT 0x04 kbhX?; <`  
#define ALTBIT 0x02 @V$I?iXV  
#define SHIFTBIT 0x01 =UNT.]  
#pragma data_seg("shareddata") _dr*`yXi  
HHOOK hHook =NULL; _s*! t  
UINT nHookCount =0; D^u\l  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey wu2:'y>n  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT aM$=|%9/  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey gLD{1-v  
static int KeyCount =0; IcFK,y%1  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ra:GzkIw  
#pragma data_seg() < eQ[kM  
HINSTANCE hins; A*F9\mj I5  
void VerifyWindow(); j=W@P-  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) WYLX?x  
//{{AFX_MSG_MAP(CHookApp) dF e4K"  
// NOTE - the ClassWizard will add and remove mapping macros here. ]G*$W+G]  
// DO NOT EDIT what you see in these blocks of generated code! uoCGSXsi  
//}}AFX_MSG_MAP YBvd q1  
END_MESSAGE_MAP() q 5p e~  
u s`}  
CHookApp::CHookApp() o,FUfO}F  
{ bMmra.x4L  
 // TODO: add construction code here, M/#U2!iFk  
 // Place all significant initialization in InitInstance ~^7r?<aKc  
} Ea]T>4  
#ZWl=z5aBi  
CHookApp theApp; KO&:06V{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) C3}Aq8$6  
{ ffk4mhH  
 BOOL bProcessed=FALSE; ([KN*OF  
 if(HC_ACTION==nCode) 8=F%+  
 { SF< [FM%1  
  if((lParam&0xc0000000)==0xc0000000){// Key up 9p`r7:  
   switch(wParam) kA^A mfba  
   { .C= I^  
    case VK_MENU: 2-mQt_ i  
     MaskBits&=~ALTBIT; E[?kGR[  
     break; T3z(k la  
    case VK_CONTROL: tjxvN 4l  
     MaskBits&=~CTRLBIT; FT.@1/)  
     break; %v4ZGtKC@  
    case VK_SHIFT: H$tb;:  
     MaskBits&=~SHIFTBIT; UX_I6_&  
     break; rk,p!}FqL  
    default: //judge the key and send message x?L hq2  
     break; "}zda*z8  
   } l^r' $;<m  
   for(int index=0;index<MAX_KEY;index++){ e{C6by"j{S  
    if(hCallWnd[index]==NULL) #DUh(:E'`  
     continue; |ym%| B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !8$RBD %  
    { C).2gQ G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); zu<3^=3  
     bProcessed=TRUE; Of`c`-<j  
    } D1Yh,P<CF\  
   } )N7n,_#T>  
  } ow.j+ <M  
  else if((lParam&0xc000ffff)==1){ //Key down `o si"o9  
   switch(wParam) uRQ_'l  
   { 5@P-g  
    case VK_MENU: 4;*f1_;f~  
     MaskBits|=ALTBIT; 9+Nw/eszO  
     break; 'm O2t~n  
    case VK_CONTROL: 2jA%[L9d^  
     MaskBits|=CTRLBIT;  U:|H9+5  
     break; A1A3~9HuK  
    case VK_SHIFT: p4> ,Fwy2  
     MaskBits|=SHIFTBIT; 1S%}xsR0  
     break; 6vp0*ww  
    default: //judge the key and send message l2&hBacT  
     break; f0oek{  
   } 6fwY$K\X  
   for(int index=0;index<MAX_KEY;index++) Nl*i5 io  
   { *^h_z;{,  
    if(hCallWnd[index]==NULL) np6HUH  
     continue; C5n?0I9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _N'75  
    { vv/J 5#^,\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); , Oli  
     bProcessed=TRUE; 8QF`,oXQO  
    } /F~X,lm*~  
   } r4;Bu<PQN1  
  } 8A{6j  
  if(!bProcessed){ .nZ3kT`  
   for(int index=0;index<MAX_KEY;index++){ k dU! kj  
    if(hCallWnd[index]==NULL) 9?`RR/w  
     continue; ek)Xrp:2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) o&-L0]i|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); =n0*{~r  
   } 9L)L|4A.l  
  } 7+ XM3  
 } h&'=F)5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); UR3$B%i  
} 0BTLcEqgZ  
@ajM^L!O  
BOOL InitHotkey() Lk.h.ST  
{ DQgH_!  
 if(hHook!=NULL){ [7\>"v6  
  nHookCount++; w O!u!I  
  return TRUE; DO^y;y>  
 } )HVcG0H1  
 else mm,lhIh  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ;KcFy@ 6q5  
  if(hHook!=NULL) I; j3*lV_  
   nHookCount++; \P?A7vuhLs  
  return (hHook!=NULL); l3J$md|f  
} m6U8)!)T  
BOOL UnInit() 0I zZKRw  
{ $G[KT):N  
 if(nHookCount>1){ %f!iHo+Z  
  nHookCount--; UqtHxEI%R~  
  return TRUE; GS%b=kc  
 } M#M?1(O/NE  
 BOOL unhooked = UnhookWindowsHookEx(hHook); )zJ=PF  
 if(unhooked==TRUE){ knSuzq%*  
  nHookCount=0; Yx1 D)  
  hHook=NULL; D'L{wm  
 } C1QWU5c v  
 return unhooked; \dV Too  
} h5-d;RKE  
IVteF*8hU  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) B>|5xpZM12  
{ 4VFc|g  
 BOOL bAdded=FALSE; Bp3L>AcVu  
 for(int index=0;index<MAX_KEY;index++){ e@j8T gI)  
  if(hCallWnd[index]==0){ hTw}X.<4  
   hCallWnd[index]=hWnd; d@g2k> >  
   HotKey[index]=cKey; 0&$xX!]  
   HotKeyMask[index]=cMask; c]v +  
   bAdded=TRUE; j9xXKa5  
   KeyCount++; AZ wa4n}"  
   break; E@pFTvo  
  } sqG`"O4W  
 } AgsR-"uh  
 return bAdded; BXA]9eK  
} !K\itOEP-  
-S$$/sR  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) h5!d  
{ qLRE}$P  
 BOOL bRemoved=FALSE; &<h?''nCy  
 for(int index=0;index<MAX_KEY;index++){  !!+Da>  
  if(hCallWnd[index]==hWnd){ C1 {ZW~"YI  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^zeL+(@r/  
    hCallWnd[index]=NULL; q^6N+^}QN  
    HotKey[index]=0; xBWx+My  
    HotKeyMask[index]=0; $e1:Q#den2  
    bRemoved=TRUE; ;eh/_hPM  
    KeyCount--; Omb.53+  
    break; .K7C-Xn=  
   } \G3!TwC%  
  } :gaETr  
 } 8[HZ@@  
 return bRemoved; %M6 c0d[9-  
} qUg9$oh{LI  
!x_t`78T  
void VerifyWindow() B^m!t7/,  
{ ' =}pxyg  
 for(int i=0;i<MAX_KEY;i++){ I-{^[pp  
  if(hCallWnd!=NULL){ <Wf0QO,  
   if(!IsWindow(hCallWnd)){ l $w/Fz  
    hCallWnd=NULL; LYNZP4(R  
    HotKey=0; 1M/$< kQ-N  
    HotKeyMask=0; cD8Ea(  
    KeyCount--; ]b )!YPo  
   } q_pmwJ:UL  
  } +,wWhhvlzv  
 } -%=RFgU4  
} 6Ty 3e|do  
dq2@6xd  
BOOL CHookApp::InitInstance() + Y;8~+  
{ f| =# q  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); p2^)2v  
 hins=AfxGetInstanceHandle(); Of&"U/^  
 InitHotkey(); 22'vm~2E  
 return CWinApp::InitInstance(); 2_.CX(kI  
} -U:2H7  
L5&K}F]r^  
int CHookApp::ExitInstance() S2bexbp0o  
{ ,@479ZvvR3  
 VerifyWindow(); lfRH`u  
 UnInit(); <dS5|||  
 return CWinApp::ExitInstance(); g<a<{|  
} +9jivOmK  
yH+c#w  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file MU*It"@}2  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ;xI0\a7  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ :^5>wDu{  
#if _MSC_VER > 1000 I[%M!_+  
#pragma once >-eS&rma  
#endif // _MSC_VER > 1000 Z) t{JHm:  
E;$$+rA  
class CCaptureDlg : public CDialog q6Rw4  
{ y%FYXwR{  
 // Construction ) u-ns5  
 public: =CEHRny  
  BOOL bTray; ~Z7)x7 z  
  BOOL bRegistered; T"IW Jpc  
  BOOL RegisterHotkey(); _=6vW^ s  
  UCHAR cKey; kM,@[V  
  UCHAR cMask; eA1'qww"'  
  void DeleteIcon(); qA04Vc[2  
  void AddIcon(); y%JF8R;n  
  UINT nCount; k 5t{  
  void SaveBmp(); 2G H)iUmc  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 8z?$t-DO  
  // Dialog Data ["<5?!bU  
  //{{AFX_DATA(CCaptureDlg) *XHj)DC;  
  enum { IDD = IDD_CAPTURE_DIALOG }; PMQb\%iE"  
  CComboBox m_Key; ": nI_~q  
  BOOL m_bControl; =#jTo|~u4o  
  BOOL m_bAlt; {({ R:!c  
  BOOL m_bShift; vu44!c@  
  CString m_Path; $vz_%Y  
  CString m_Number; N=.}h\{0  
  //}}AFX_DATA O0-> sR  
  // ClassWizard generated virtual function overrides xJ$Rs/9C  
  //{{AFX_VIRTUAL(CCaptureDlg) 4a#B!xW  
 public: Q:kwQg:~  
  virtual BOOL PreTranslateMessage(MSG* pMsg); mSy|&(l  
 protected: %s]U@Ku(a  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support x-tm[x@;o  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); hjw4Xzju  
  //}}AFX_VIRTUAL  MK<  
  // Implementation $3lt{ %  
 protected: 9fCiLlI  
  HICON m_hIcon; e og\pMv  
  // Generated message map functions }5QZ6i#  
  //{{AFX_MSG(CCaptureDlg) g9M')8a n  
  virtual BOOL OnInitDialog(); S_a :ML<  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); O 0Vn";Q 4  
  afx_msg void OnPaint(); 7k.d|<mRv  
  afx_msg HCURSOR OnQueryDragIcon(); 6\%r6_.d  
  virtual void OnCancel(); E {I)LdAqK  
  afx_msg void OnAbout(); ~GAlNIv]  
  afx_msg void OnBrowse(); |~7+/VvI+  
  afx_msg void OnChange(); @?'t@P:4  
 //}}AFX_MSG ,w,ENU0~f  
 DECLARE_MESSAGE_MAP() SJso'6 g  
}; @$2`DI{_^  
#endif j0ci~6&b3_  
v(i1Z}*b  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file er&uC4Y]a  
#include "stdafx.h" 45]Ym{]  
#include "Capture.h" }IxY(`:qs  
#include "CaptureDlg.h" %i;r]z-  
#include <windowsx.h> v!WU |=u  
#pragma comment(lib,"hook.lib") jydp4ek_n  
#ifdef _DEBUG p.6$w:eV  
#define new DEBUG_NEW GN"M:L ^k`  
#undef THIS_FILE w`H.ey  
static char THIS_FILE[] = __FILE__; <Tj"GVZAEO  
#endif !=8L.^5c  
#define IDM_SHELL WM_USER+1 1puEP *P  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); '6Pu[^x  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $Uv<LVd(  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; @&nx;K6h  
class CAboutDlg : public CDialog rCnV5Yb0O  
{ M"$jpBN*  
 public: 23B^g  
  CAboutDlg(); UUdu;3E=5  
  // Dialog Data ECmHy@(  
  //{{AFX_DATA(CAboutDlg) =]5DYRhX]  
  enum { IDD = IDD_ABOUTBOX }; oo$WD6eCR  
  //}}AFX_DATA 'O\d<F.c$2  
  // ClassWizard generated virtual function overrides e')&ODQ H  
  //{{AFX_VIRTUAL(CAboutDlg) (Fbm9(q$d  
 protected: fl5UY$a2-  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support thlpj*|  
  //}}AFX_VIRTUAL e4>L@7  
  // Implementation g%fJyk'  
 protected: e"v[)b++Y  
  //{{AFX_MSG(CAboutDlg) E7Gi6w~\  
  //}}AFX_MSG 82Z[eo  
  DECLARE_MESSAGE_MAP() _.Z&<.lJ  
}; 7YQK@lS  
N%n1>!X)!  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) eaYkYuS/  
{  }]n>A  
 //{{AFX_DATA_INIT(CAboutDlg) \Z6gXO_  
 //}}AFX_DATA_INIT buC m @@o  
} @kCD.  
1"4nmw}  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Z+`{JE#  
{ %Zv(gI`A  
 CDialog::DoDataExchange(pDX); DO1N`7@o  
 //{{AFX_DATA_MAP(CAboutDlg) w ;s ]n  
 //}}AFX_DATA_MAP 5.C[)`_  
} qqz,~EhC  
JQbMw>Y  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) bH WvKv+  
 //{{AFX_MSG_MAP(CAboutDlg) s:m<(8WRw  
 // No message handlers \{+nXn  
 //}}AFX_MSG_MAP n|4D#Bd1w  
END_MESSAGE_MAP() >m_ p\$_  
 Z,8+@  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) e2Kpx8kWj  
: CDialog(CCaptureDlg::IDD, pParent) "6*Kgf2G  
{ jFPE>F7-M  
 //{{AFX_DATA_INIT(CCaptureDlg) !+|N<`  
  m_bControl = FALSE; mb*h73{{  
  m_bAlt = FALSE; n%MYX'0  
  m_bShift = FALSE; 5S-o 2a  
  m_Path = _T("c:\\"); M;vlQ"Yl'  
  m_Number = _T("0 picture captured."); = "hY{RUa  
  nCount=0; M\.T 0M_  
  bRegistered=FALSE; jO3u]5}.6  
  bTray=FALSE; BqEubP(si  
 //}}AFX_DATA_INIT GZhfA ;O,  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Mp=kZs/  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); D-+)M8bt  
} j@?[vi  
LN3dp?;_{  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) m|cWX"#g  
{ 6L6~IXL>  
 CDialog::DoDataExchange(pDX); 9bcyPN  
 //{{AFX_DATA_MAP(CCaptureDlg) .L(j@I t  
  DDX_Control(pDX, IDC_KEY, m_Key); }$k`[ivBx(  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); J&U0y  
  DDX_Check(pDX, IDC_ALT, m_bAlt); #ZnX6=;X  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); s3E~X  
  DDX_Text(pDX, IDC_PATH, m_Path); 7Ae,|k  
  DDX_Text(pDX, IDC_NUMBER, m_Number); RnBmy^l"  
 //}}AFX_DATA_MAP A*;^F]~'  
} @Jn:!8U0  
5bznM[%xO  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) D15u1A  
//{{AFX_MSG_MAP(CCaptureDlg) 53+rpU_  
 ON_WM_SYSCOMMAND() $I6eHjYT  
 ON_WM_PAINT() aaD$'Y,<>B  
 ON_WM_QUERYDRAGICON() IweK!,:>dN  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 7D~O/#dcc  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 't%%hw-m}  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ch8w'  
//}}AFX_MSG_MAP uj1E* 98m  
END_MESSAGE_MAP() *=0r>]  
g Wv+i/,  
BOOL CCaptureDlg::OnInitDialog() ,t&-`U]AX  
{ Q|H cg|  
 CDialog::OnInitDialog(); }:D~yEP  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); V?J,ab$X#  
 ASSERT(IDM_ABOUTBOX < 0xF000); #|_UA}Y  
 CMenu* pSysMenu = GetSystemMenu(FALSE); /uz5V/i0  
 if (pSysMenu != NULL) @SG="L  
 { (*WZsfk>/<  
  CString strAboutMenu; Jx>B %vZ\  
  strAboutMenu.LoadString(IDS_ABOUTBOX); [ EID27P  
  if (!strAboutMenu.IsEmpty()) 42LXL*-4  
  { dQ|Ht[ s=  
   pSysMenu->AppendMenu(MF_SEPARATOR); Hi" n GH  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 5 /jY=/0.a  
  } /\$|D&e  
 } R}6la.mQ  
 SetIcon(m_hIcon, TRUE); // Set big icon 4kF .  
 SetIcon(m_hIcon, FALSE); // Set small icon 2CgIY89O  
 m_Key.SetCurSel(0); 9}0Jc(B/x  
 RegisterHotkey(); 2xdJ(\JWM  
 CMenu* pMenu=GetSystemMenu(FALSE); K}/`YDu  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); $,zM99  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); S,9WMti4x  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); AG\ 852`1m  
 return TRUE; // return TRUE unless you set the focus to a control [%,=0P}  
} )hJjVitG  
%c/"A8{eb  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) WJ4UJdf'  
{ L\b_,'I  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) (0m$W<  
 { 5 ^J8<s@_  
  CAboutDlg dlgAbout; I%C:d#p  
  dlgAbout.DoModal(); vk+%#w  
 } J*&=J6  
 else s l @6  
 { "57G@NC{n  
  CDialog::OnSysCommand(nID, lParam); H08YM P>dc  
 } tUF]f6  
} HFWm}vA:  
N_[ Q.HD"  
void CCaptureDlg::OnPaint() o? "@9O?  
{ 6@ ^`-N;  
 if (IsIconic()) A2_3zrE  
 { sZBO_](S  
  CPaintDC dc(this); // device context for painting )^#Zg8L  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); `2,_"9Z(  
  // Center icon in client rectangle *LdH/C.LIf  
  int cxIcon = GetSystemMetrics(SM_CXICON); 'c(Y")QP  
  int cyIcon = GetSystemMetrics(SM_CYICON); 1V$B^/_  
  CRect rect; ibUPd."W  
  GetClientRect(&rect); `|?$; )  
  int x = (rect.Width() - cxIcon + 1) / 2; vbh#[,lh  
  int y = (rect.Height() - cyIcon + 1) / 2; {:OVBX  
  // Draw the icon Z*"t]L  
  dc.DrawIcon(x, y, m_hIcon); &n kGdHX/a  
 } VZ@@j[F(  
 else 2czL 1Ci  
 { Qh%vh ;|^  
  CDialog::OnPaint(); x+`3G.  
 } [;8fL  
} irj}:f;!eF  
\ jdO,-(  
HCURSOR CCaptureDlg::OnQueryDragIcon() {j*+:Gj0V  
{ 8^i,M^f^{  
 return (HCURSOR) m_hIcon; |noTIAI  
} }kefrT  
1 K',Vw_  
void CCaptureDlg::OnCancel() 4zbV' ]  
{ 481u1  
 if(bTray) 30`H Xv@  
  DeleteIcon(); :8T@96]P  
  CDialog::OnCancel(); o%Q2.  
} K%_JQ0`  
I@v.Hqg+7  
void CCaptureDlg::OnAbout() s5#g[}dj  
{ ,W;8!n0  
 CAboutDlg dlg; <rxem(PPu  
 dlg.DoModal(); .gg0:  
} 7@]hu^)rry  
lR^Qm|  
void CCaptureDlg::OnBrowse() #R| 4(HlL  
{ C,.{y`s'  
 CString str; G&Sg .<hn  
 BROWSEINFO bi; ?"Q6;np*  
 char name[MAX_PATH]; CcE TS}Q0C  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); .1M>KRSr,  
 bi.hwndOwner=GetSafeHwnd(); "<b84?V5  
 bi.pszDisplayName=name; "E#%x{d  
 bi.lpszTitle="Select folder"; i?9Lf  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; :g_ +{4  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); %)]RM/e8  
 if(idl==NULL) 5J3kQ;5Q?  
  return; e@Y R/I8my  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); vi|ASA{V  
 str.ReleaseBuffer(); B9\o:eY  
 m_Path=str; G9Ezm*I;:  
 if(str.GetAt(str.GetLength()-1)!='\\') x$sQ .aT  
  m_Path+="\\"; hw2Hn   
 UpdateData(FALSE); vkLG<Y  
} ['j,S<Bu~  
qI:wm=  
void CCaptureDlg::SaveBmp() huE#VY /t  
{ h#9)M  
 CDC dc; dRmTE  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); j>zVC;Sj*  
 CBitmap bm; i"@?eq#h  
 int Width=GetSystemMetrics(SM_CXSCREEN); #'oKkrl  
 int Height=GetSystemMetrics(SM_CYSCREEN); -)GfSk   
 bm.CreateCompatibleBitmap(&dc,Width,Height); !j@ 8:j0WY  
 CDC tdc; 5`Z#m:+u  
 tdc.CreateCompatibleDC(&dc); 6dp~19T^  
 CBitmap*pOld=tdc.SelectObject(&bm); To+{9"$,  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); )Ec;krb+  
 tdc.SelectObject(pOld); dewu@  
 BITMAP btm; 2o;M:+KQ)  
 bm.GetBitmap(&btm); wv$=0zF  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; zb(u?U  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); K||85l?<  
 BITMAPINFOHEADER bih; 2ou?:5i  
 bih.biBitCount=btm.bmBitsPixel; -rfO"D>  
 bih.biClrImportant=0; O<*iDd`(e  
 bih.biClrUsed=0; d8>D=Ve  
 bih.biCompression=0; ~i4@sz&  
 bih.biHeight=btm.bmHeight; zob-z=='  
 bih.biPlanes=1; |^{ IHF\  
 bih.biSize=sizeof(BITMAPINFOHEADER); _)Ms9RN  
 bih.biSizeImage=size; 5`J. ic  
 bih.biWidth=btm.bmWidth; ~zx-'sc?  
 bih.biXPelsPerMeter=0; o0q{:An_Z  
 bih.biYPelsPerMeter=0; T&%>/7I>  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); +^.(3Aw  
 static int filecount=0; -3Ffk:  
 CString name; x]:mc%4-Z  
 name.Format("pict%04d.bmp",filecount++); G7yxCU(I\  
 name=m_Path+name; K;K tx>Z/  
 BITMAPFILEHEADER bfh; C>HU G  
 bfh.bfReserved1=bfh.bfReserved2=0; !O\r[c  
 bfh.bfType=((WORD)('M'<< 8)|'B'); & 3gni4@@  
 bfh.bfSize=54+size; lL?;?V~  
 bfh.bfOffBits=54; SE\`JGA[  
 CFile bf; @`3)?J[w  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ n\QG-?%Pi  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); @"6BvGU2s  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); uZNR]+Yu@  
  bf.WriteHuge(lpData,size); ,J[sg7v cv  
  bf.Close(); _Nd\Cm  
  nCount++; i9\Pks#l%  
 } tY7u\Y;^  
 GlobalFreePtr(lpData); 7HzKjR=B  
 if(nCount==1) 5d)G30  
  m_Number.Format("%d picture captured.",nCount); <J- aq;p  
 else PW}Yts7p  
  m_Number.Format("%d pictures captured.",nCount); |YH1q1l  
  UpdateData(FALSE); .w0?  
} i"-j:b:c<  
P~~RK& +i  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) GovGh? X#x  
{ 6A%Y/oU+2  
 if(pMsg -> message == WM_KEYDOWN) Si;e_a  
 { _onHe"%{  
  if(pMsg -> wParam == VK_ESCAPE) *d@}'De{8  
   return TRUE; Ouj5NL  
  if(pMsg -> wParam == VK_RETURN) HG Pbx$!  
   return TRUE; 1j}o. 0\  
 } *? c~7ru  
 return CDialog::PreTranslateMessage(pMsg); e Q0bx&  
} *FO']D  
62.{8Uj  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Y*4\K%e(  
{ ^b&aDm~(7  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 0\.y0 K8  
  SaveBmp(); 0evG  
  return FALSE; 'A4Lr  
} wLW!_D,/R  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){  Wkf)4!  
 CMenu pop; Uq"RyvkpP  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); gp;(M~we  
 CMenu*pMenu=pop.GetSubMenu(0); [j&>dE  
 pMenu->SetDefaultItem(ID_EXITICON); +W-sb5)  
 CPoint pt; t0?\5q  
 GetCursorPos(&pt); _))_mxV{  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); G3KiU($V  
 if(id==ID_EXITICON) P[^!Uq[0n7  
  DeleteIcon(); SdN|-'qf  
 else if(id==ID_EXIT) U%2pbGU  
  OnCancel(); ^m?h .  
 return FALSE; D_'Zucq  
} 0^zu T  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); he 9qWL&^G  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {n{ j*+  
 AddIcon(); 0YW<>Y`6  
 return res; %$S.4#G2  
} Zb3E-'G+  
Ktg6*L/  
void CCaptureDlg::AddIcon() <^OGJ}G  
{ ;p) gTQa  
 NOTIFYICONDATA data; "c=\?   
 data.cbSize=sizeof(NOTIFYICONDATA); lZ'NL bK  
 CString tip; V&[|%jm&   
 tip.LoadString(IDS_ICONTIP); Q_]O[Kx  
 data.hIcon=GetIcon(0); F~z4T/TN%G  
 data.hWnd=GetSafeHwnd(); !c'a<{d@  
 strcpy(data.szTip,tip); <{:$ ]3  
 data.uCallbackMessage=IDM_SHELL; a'W-&j  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; N(6|TE2  
 data.uID=98; mam|aRzd  
 Shell_NotifyIcon(NIM_ADD,&data); Ez+.tbEA,  
 ShowWindow(SW_HIDE); ;}WdxWw4  
 bTray=TRUE; /mF%uI>:  
} HS>Z6|uLY  
d%\en&:la  
void CCaptureDlg::DeleteIcon() ut fD$8UI  
{ U2\zl  
 NOTIFYICONDATA data; pd/{yX M  
 data.cbSize=sizeof(NOTIFYICONDATA); V1,O7m+F2  
 data.hWnd=GetSafeHwnd(); -}4<P}.5T  
 data.uID=98; l0l2fwz(  
 Shell_NotifyIcon(NIM_DELETE,&data); +'x|VPY.PG  
 ShowWindow(SW_SHOW); u#ag|b/C:  
 SetForegroundWindow(); "~> # ;x{  
 ShowWindow(SW_SHOWNORMAL); uR"(0_  
 bTray=FALSE; [2WJ>2r}6  
} c>,|[zP{  
"at*G>+  
void CCaptureDlg::OnChange() 8%@7G*  
{ gR )xw)!  
 RegisterHotkey(); [f!sBJ!  
} t6W$t  
'x$>h)t]  
BOOL CCaptureDlg::RegisterHotkey() hWP$U  
{ MR}GxI  
 UpdateData(); rd vq(\A  
 UCHAR mask=0; \'q 9,tP  
 UCHAR key=0; Ml@,xJ/aia  
 if(m_bControl) KU|dw^Yk  
  mask|=4; w)2X0ev"  
 if(m_bAlt) =$`EB  
  mask|=2; 4 Z.G  
 if(m_bShift) fo;Ftf0  
  mask|=1; -|"W|K?nq  
  key=Key_Table[m_Key.GetCurSel()]; +] s"*'V$  
 if(bRegistered){ 5ztHar~f  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); wxYB-Wh<  
  bRegistered=FALSE; yj13>"nh  
 } ]@wee08  
 cMask=mask; A%qlB[!:  
 cKey=key; J5b>mTvb  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); I<PKwT/?  
 return bRegistered;  } Wx#"6  
} tXDO@YH3S  
G$kspN*"A  
  四、小结 B! $a Y  
vN'Y);$  
  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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