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用Visual C++实现屏幕抓图程序

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 在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示: F{\=PCZ>7  
  m<3w^mww  
  一、实现方法 ~;8I5Sge  
x}|+sS,g  
  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: FfG%C>E6~  
l~ D\;F  
#pragma data_seg("shareddata") z+ ZG1\  
HHOOK hHook =NULL; //钩子句柄 IT18v[-G  
UINT nHookCount =0; //挂接的程序数目 ^&MK42,\  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 SB/3jH  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 n+rM"Gxz  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey t!:)L+$3  
static int KeyCount =0; o0l7 4  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -=a[J;'q  
#pragma data_seg() \E77SO,$  
(0R2T"/  
  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。 Im+ 7<3Z  
Yz\ N&0"  
  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: X8Fzs!L`  
BPewc9RxV  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR P$OUi!"  
cKey,UCHAR cMask) v%nP*i9  
{ $''UlWK  
 BOOL bAdded=FALSE; 1x{kl01m%  
 for(int index=0;index<MAX_KEY;index++){ G|*G9nQ  
  if(hCallWnd[index]==0){ XXm'6xD-  
   hCallWnd[index]=hWnd; xNIGO/uI~  
   HotKey[index]=cKey; #A )Ab%r8"  
   HotKeyMask[index]=cMask; R5ZIC4p  
   bAdded=TRUE; -=mwy  
   KeyCount++; VE$t%QT  
   break; j8a[ (  
  } g YUTt  
 } (v^Z BM_  
 return bAdded; "mA1H]r3  
} Zi*%*nX  
//删除热键 Oyan9~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |IN[uQ  
{ d@ (vg  
 BOOL bRemoved=FALSE; AG>\aV"b  
 for(int index=0;index<MAX_KEY;index++){ o0mJy'  
  if(hCallWnd[index]==hWnd){ yLqF ,pvO  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?oKL &I@  
    hCallWnd[index]=NULL; R5kH0{zM  
    HotKey[index]=0; n"Z |e tZ4  
    HotKeyMask[index]=0; Y{+3}drJE  
    bRemoved=TRUE; *)D1!R<\,R  
    KeyCount--; :j,}{)5=  
    break; $DE&J4K  
   } CmHyAw(  
  } `{o$F ::(  
 } +?AW>&68y  
 return bRemoved; ``4?a7!!  
} 4.w"(v9V  
V;;#/$oU:4  
N}mh}  
  DLL中的钩子函数如下: ~},W8\C>  
Z0\Iyc G  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) t^U^Tr  
{ AY88h$a  
 BOOL bProcessed=FALSE; 2y%R:Mu  
 if(HC_ACTION==nCode) BIj   
 { Dr+Ps  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 12OlrU  
   switch(wParam) 30d#Lq  
   {  oY.\)eJ~>  
    case VK_MENU: iRt*A6`m+  
     MaskBits&=~ALTBIT; vQHpf>o  
     break; {SdO9Yy?@7  
    case VK_CONTROL: FmD +8=  
     MaskBits&=~CTRLBIT; VB"(9O]  
     break; iRve)   
    case VK_SHIFT: ix*muVBj.  
     MaskBits&=~SHIFTBIT; 0OWL  
     break; Hi8Y6|y$D  
    default: //judge the key and send message CXAVGO'xw  
     break; |}Ph"g2D,  
   } -N# #w=  
   for(int index=0;index<MAX_KEY;index++){ J\A8qh8  
    if(hCallWnd[index]==NULL) /b%Q[ Ck_  
     continue; A ~&+F>Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X"<|Z]w  
    { @GeHWv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ep ">v>"  
     bProcessed=TRUE; bV6V02RF  
    } 2 Y+:,ud\  
   } a+ GJVJ  
  } doLNz4W  
  else if((lParam&0xc000ffff)==1){ //有键按下 "+h/-2rA  
   switch(wParam) E9$H nj+m  
   { y6%<zhs  
    case VK_MENU: #PFO]j!_b  
     MaskBits|=ALTBIT; '[ 0YIn  
     break; Pa&4)OD  
    case VK_CONTROL: j^ EbO3  
     MaskBits|=CTRLBIT; !y*oF{RZ  
     break; J?D\$u:  
    case VK_SHIFT: -J?~U2  
     MaskBits|=SHIFTBIT; CDCC1BG"  
     break; G Y-M.|%  
    default: //judge the key and send message RxG^  
     break; z<<Tk.65  
   } Gru ALx7  
   for(int index=0;index<MAX_KEY;index++){ hW' HT  
    if(hCallWnd[index]==NULL) %\I.DEYH  
     continue; mx}E$b$<CY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6Xa.0(h  
    { ^73=7PZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  AP w6  
     bProcessed=TRUE; e{!vNJ0`  
    } VMHC/jlX@r  
   } ;J=:IEk  
  } R|Y~u*D  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 U ~1 SF  
   for(int index=0;index<MAX_KEY;index++){ 8&.-]{Z  
    if(hCallWnd[index]==NULL) JXm?2 /  
     continue; 1VLLo~L%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Z %EQt  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); tlGWl0V?7Q  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 oD0EOT/E  
   } H[nz]s  
  } L_?$ayZ;  
 } a5V=!OoMk  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); o5 WW{)Q  
} /^ 4"Qv\@/  
VQ<5%+  
  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: VGZ6  
qd(hQsfqYU  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ub)M*Cq0(o  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  yekRwo|  
]>8)|]O6n  
  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: 4bI*jEc\[  
~6d5zI4\  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3cThu43c  
{ [Vp\$;\nT  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Le&;g4%  
 { , N 344y  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 J"&y |; G  
  SaveBmp(); q"nGy#UWR  
  return FALSE; zs8I  
 } v<&v]!nF  
 …… //其它处理及默认处理 ";dU-\3M  
} e /94y6*>  
K7RKF$Z\  
oAz<G  
  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。 x'i0KF   
}n[Bq#  
  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。 , ` o+ ?  
U~/ID  
  二、编程步骤 kl<g;3  
) ,Npv3(  
  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"; 2.qpt'p[  
0N5bPb  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; !Uy>eji}  
e1 ^l.>2d6  
  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; uV77E*+7\  
c&e0OV\m  
  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; ^Y 7U1I  
CQ18%w6  
  5、 添加代码,编译运行程序。 cL7C 2wB`  
gjZx8oIoP  
三、程序代码 SQ<f  
KN, 4@4  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL jY+Do:#/wO  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) }]GbUC!Zb  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ J6auUm` `  
#if _MSC_VER > 1000 4J}3,+  
#pragma once !. eAOuq  
#endif // _MSC_VER > 1000 "TFwHe3C4  
#ifndef __AFXWIN_H__ F*\4l;NJ  
#error include 'stdafx.h' before including this file for PCH [*HiI=  
#endif j@t{@Ke  
#include "resource.h" // main symbols |j# ^@R  
class CHookApp : public CWinApp "dq>) JF\  
{ [q"NU&SX  
 public: gh61H:tkR  
  CHookApp(); <<<NXsH  
  // Overrides (&c,twa~  
  // ClassWizard generated virtual function overrides T#r=<YH[C  
  //{{AFX_VIRTUAL(CHookApp) 7LdzZS0OM  
 public: XtzOFx/  
  virtual BOOL InitInstance(); {u4i*udG`)  
  virtual int ExitInstance(); -TZ^~s  
  //}}AFX_VIRTUAL "XB4yExy  
  //{{AFX_MSG(CHookApp) w%2ziwgh  
  // NOTE - the ClassWizard will add and remove member functions here. UR,?!rJ^B  
  // DO NOT EDIT what you see in these blocks of generated code ! ^U{P3 %uZ  
  //}}AFX_MSG ;@4sd%L8V  
  DECLARE_MESSAGE_MAP() UN(3i(d  
}; )Ga8`t"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); PW)8aLU  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6sy,A~e  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .hne)K%={y  
BOOL InitHotkey(); hgwn> p:S#  
BOOL UnInit(); TrQm]9@  
#endif ^'Y HJEK  
rkIMM,   
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. |0]YA  
#include "stdafx.h" 1tyNRoET  
#include "hook.h" rXDJ:NP  
#include <windowsx.h> @ExLh9  
#ifdef _DEBUG `u=oeM :  
#define new DEBUG_NEW 5"uNj<.V  
#undef THIS_FILE y($EK(cb  
static char THIS_FILE[] = __FILE__; 3P`WPph  
#endif f}blB?e  
#define MAX_KEY 100 wt\m+!u`  
#define CTRLBIT 0x04 y9ip[Xn-$:  
#define ALTBIT 0x02 =h7[E./U1  
#define SHIFTBIT 0x01 ogp{rY  
#pragma data_seg("shareddata") xD^wTtT  
HHOOK hHook =NULL; pJ6Jx(  
UINT nHookCount =0; E4Zxv*  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ?sE@]]z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT {83C,C-  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey O$U}d-Xnx  
static int KeyCount =0; UQnBqkE  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift C$_G'XI  
#pragma data_seg() 8=pv/o  
HINSTANCE hins; A$ J9U3+O  
void VerifyWindow(); R. O  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ?-S8yqe  
//{{AFX_MSG_MAP(CHookApp) wA1Ey:q  
// NOTE - the ClassWizard will add and remove mapping macros here. XD 5n]AL  
// DO NOT EDIT what you see in these blocks of generated code! OOfy Gvs  
//}}AFX_MSG_MAP ZIe+  
END_MESSAGE_MAP() <OIUyZS  
}1,'rm T  
CHookApp::CHookApp() FvAbh]/4  
{ s!aO*\[<h  
 // TODO: add construction code here, 3l$E8?[Zwi  
 // Place all significant initialization in InitInstance y,V6h*x2  
} 9u?Eb~#$  
VZTmzIk.Y  
CHookApp theApp; X'xUwT|_+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) n_1jHJo  
{ @wMQC\Z  
 BOOL bProcessed=FALSE; @Jm.HST#S8  
 if(HC_ACTION==nCode) %fBP:5%K  
 { 4?v$<=#21*  
  if((lParam&0xc0000000)==0xc0000000){// Key up r:73uRk  
   switch(wParam) G LoiH#R  
   { {wHvE4F2  
    case VK_MENU: *h:D|4oJ(  
     MaskBits&=~ALTBIT; ^glX1 )  
     break; OgQntj:%lN  
    case VK_CONTROL: {hM"TO7\  
     MaskBits&=~CTRLBIT; ;*nh=w  
     break; 8-A:k E  
    case VK_SHIFT: .(JE-upJ"  
     MaskBits&=~SHIFTBIT; O%52V|m}{  
     break; :Jm!=U%'Z  
    default: //judge the key and send message ^]i" H|(x  
     break; ?P%|P   
   } %n4@[fG%K  
   for(int index=0;index<MAX_KEY;index++){ &{BBxv)y  
    if(hCallWnd[index]==NULL) ?THa5%8f  
     continue; J}:&eS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ed=n``P~}  
    { #jOOsfH|k  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); dV)Y,Yx0${  
     bProcessed=TRUE; X=JFWzC  
    } WFRsSp2  
   } ~m!#FTc*  
  } n%n'1AUP:  
  else if((lParam&0xc000ffff)==1){ //Key down R9Ldl97'  
   switch(wParam) #t){4J  
   { k]t,q$Vd  
    case VK_MENU: xna7kA  
     MaskBits|=ALTBIT; 'y< t/qo  
     break; bB y'v/  
    case VK_CONTROL: Ywmyr[Uh'  
     MaskBits|=CTRLBIT; akMJ4EF/  
     break;  ccRlql(  
    case VK_SHIFT: )4@M`8  
     MaskBits|=SHIFTBIT; J`4Z<b53  
     break; Y$>+U  
    default: //judge the key and send message s%5Uj }  
     break; j,\tejl1  
   } cT\O v P*_  
   for(int index=0;index<MAX_KEY;index++) K!9y+%01  
   { NWw<B3aL  
    if(hCallWnd[index]==NULL) 3'.! +#  
     continue; HJc<Gwm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fn3*2  
    { K *TnUQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); L^6"' #  
     bProcessed=TRUE; p@vpd  
    } " 98/HzR  
   } u$apH{  
  } %B[YtWqm`/  
  if(!bProcessed){ Tc9&mKVE%(  
   for(int index=0;index<MAX_KEY;index++){ ,?Ok[G!cm  
    if(hCallWnd[index]==NULL) TFNUv<>X  
     continue; d:A\<F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +d.u##$  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); _L8Mpx*E  
   } hJecCOA)'  
  } >9 q]>fJ  
 } wj}=@HS,3!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )t*S 'R  
} lB=(8.  
0Wjd-rzc,  
BOOL InitHotkey() m"5{D*|  
{ ~u};XhZ  
 if(hHook!=NULL){ \)FeuLGL9  
  nHookCount++; 7F,07\c  
  return TRUE; fKFnCng  
 } ixIh T  
 else rH[5~U  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); O'"YJ,  
  if(hHook!=NULL) Ii|uGxEc  
   nHookCount++; pTc$+Z7 3  
  return (hHook!=NULL); S4;wa6  
} +G<}JJ'V  
BOOL UnInit() &,^mM' C  
{ u wH)$Pl  
 if(nHookCount>1){ c'"#q)  
  nHookCount--; ,jAx%]@,I  
  return TRUE; !>CE(;E>z  
 } V+Y|4Y&  
 BOOL unhooked = UnhookWindowsHookEx(hHook); s.f`.o  
 if(unhooked==TRUE){ d&/^34gn  
  nHookCount=0; >_rzT9gX&  
  hHook=NULL; ` 52% XI  
 } j kSc&  
 return unhooked; kTr6{9L  
} E%-Pyg*  
7bctx_W&6  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !y.ei1diw  
{ KK@ &q  
 BOOL bAdded=FALSE; K4iI:  
 for(int index=0;index<MAX_KEY;index++){ eKL]E!  
  if(hCallWnd[index]==0){ !x`;>0  
   hCallWnd[index]=hWnd; ='7er.~\  
   HotKey[index]=cKey; K#_~ !C4L  
   HotKeyMask[index]=cMask; :&xz5c`"04  
   bAdded=TRUE; 83mlZ1jQz  
   KeyCount++; NYWG#4D  
   break; f 1sy9nQs  
  } }@3Ud ' Y  
 } w%>aR_G  
 return bAdded; b7?U8/#'  
} MDMtOfe|  
}v_p gatC  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 59&T/  
{ ST[2]   
 BOOL bRemoved=FALSE; 9zXu6<|qrL  
 for(int index=0;index<MAX_KEY;index++){ ^</65+OT+  
  if(hCallWnd[index]==hWnd){ r~ZS1Tp  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 5F'%i;)oq  
    hCallWnd[index]=NULL; Yh}zt H  
    HotKey[index]=0; aR`_h=a  
    HotKeyMask[index]=0; EJ WOXxU  
    bRemoved=TRUE;  f$:7A0  
    KeyCount--;  !7 ei1  
    break; ( rA\_FOJ  
   } ^L>MZA ?  
  } #Tr;JAzVjG  
 } ygmv_YLjm  
 return bRemoved; #pS]k<o%1  
} cp E25  
CBiU#h q  
void VerifyWindow() 0_YxZS\  
{ 1{SrHdD=  
 for(int i=0;i<MAX_KEY;i++){ B'WCN&N  
  if(hCallWnd!=NULL){ @5{.K/s  
   if(!IsWindow(hCallWnd)){ 1Z^`l6|2  
    hCallWnd=NULL; 4M;sD;3  
    HotKey=0; J!21`M-Ue  
    HotKeyMask=0; i /O1vU#  
    KeyCount--; [W^6u7~  
   } o0,UXBx  
  } C><<0VhU  
 } $=e&q  
} u=p ;A1oy  
]_^"|RJ  
BOOL CHookApp::InitInstance() \_m\U.*  
{ w.4u=e >Z4  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); \zk?$'d  
 hins=AfxGetInstanceHandle(); :FX'[7;p  
 InitHotkey(); +-Z"H)  
 return CWinApp::InitInstance(); OaD Alrm  
} MgJ%26TZ  
3a'Rs{qxn  
int CHookApp::ExitInstance() v#Cz&j  
{ W0+gfg  
 VerifyWindow(); =]_d pEEQ  
 UnInit(); mQwk!* U  
 return CWinApp::ExitInstance(); t9Enk!@  
} *r)zBr  
Wrf^O2  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file _&k'j)rg  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 7Y-FUZ.`>  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ &+)+5z_d  
#if _MSC_VER > 1000 4 7)+'`  
#pragma once K;@RUy~  
#endif // _MSC_VER > 1000 blKDQ~T2  
N0y;PVAGu  
class CCaptureDlg : public CDialog J6@(X8w{j  
{ ^4xlZouCb  
 // Construction VxUvvJ{-v  
 public: uR06&SaA>  
  BOOL bTray; )@8'k]Glw.  
  BOOL bRegistered; _aXP ;kFMi  
  BOOL RegisterHotkey(); ?D*Hl+iu  
  UCHAR cKey; ?$"x^=te7  
  UCHAR cMask; SY!`a:It  
  void DeleteIcon(); 4_6W s$x  
  void AddIcon(); RZ#alFL,  
  UINT nCount; ]p4`7@@)*  
  void SaveBmp(); #}[Sj-Vp  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^%K1R;  
  // Dialog Data ;,F-6RNj  
  //{{AFX_DATA(CCaptureDlg) 8]cv&d1f  
  enum { IDD = IDD_CAPTURE_DIALOG }; tJ?qcT?  
  CComboBox m_Key; d&PE,$XC  
  BOOL m_bControl; ImUQ*0  
  BOOL m_bAlt; "4Vi=*2V  
  BOOL m_bShift; /t$+Af,}  
  CString m_Path; htUy2v#V  
  CString m_Number; h/0<:eZ*  
  //}}AFX_DATA w%i+>\tO  
  // ClassWizard generated virtual function overrides X_-Hrp!h  
  //{{AFX_VIRTUAL(CCaptureDlg) _Ewy^;S%L  
 public: xh+AZ3  
  virtual BOOL PreTranslateMessage(MSG* pMsg); "K}W^J9v  
 protected: @1pW!AdN  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L:t)$iF5+  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Z`-)1!  
  //}}AFX_VIRTUAL Gx(KN57D  
  // Implementation x[GFX8h(k6  
 protected: {<- ouD  
  HICON m_hIcon; }<5\O*kX4  
  // Generated message map functions ])Q9=?Sd}  
  //{{AFX_MSG(CCaptureDlg) dU sJv  
  virtual BOOL OnInitDialog(); N27K  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 2-"Lxe65f  
  afx_msg void OnPaint(); 7.lK$J:  
  afx_msg HCURSOR OnQueryDragIcon(); A:8FJ3'  
  virtual void OnCancel(); CO:m]oj  
  afx_msg void OnAbout(); :|3"H&FWK  
  afx_msg void OnBrowse(); %T&&x2p^=?  
  afx_msg void OnChange(); +H)!uLva B  
 //}}AFX_MSG J[& 7,}  
 DECLARE_MESSAGE_MAP() ]zhq.O >2{  
}; 4t +/  
#endif Azq#}Oe)u  
W[[YOK1T  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Gg}LC+Y  
#include "stdafx.h" ~L \(/[  
#include "Capture.h" T9<H%iF  
#include "CaptureDlg.h" cdek^/  
#include <windowsx.h> T0*TTB&b  
#pragma comment(lib,"hook.lib") .swgXiRvs  
#ifdef _DEBUG 6?<`wGs(  
#define new DEBUG_NEW ?v)"%.  
#undef THIS_FILE o3TBRn,  
static char THIS_FILE[] = __FILE__; tvj'{W  
#endif %WJ{IXlz  
#define IDM_SHELL WM_USER+1 WoClTb>F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T,xVQ4J?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); lvz:UWo  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; v:J.d5  
class CAboutDlg : public CDialog ?VOs:sln  
{ $:-= >  
 public: #/XK&(X  
  CAboutDlg(); QAOk  
  // Dialog Data R+ #.bQg  
  //{{AFX_DATA(CAboutDlg) @0/@p"j  
  enum { IDD = IDD_ABOUTBOX }; -+ IX[  
  //}}AFX_DATA p@NEr,GB  
  // ClassWizard generated virtual function overrides WrK^>  
  //{{AFX_VIRTUAL(CAboutDlg) COkLn)+0  
 protected: eLt Cxe  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1CS]~1Yp:  
  //}}AFX_VIRTUAL PTI'N%W  
  // Implementation G5XnGl }Q  
 protected: gKm~cjCB`~  
  //{{AFX_MSG(CAboutDlg) e u=f-HW]  
  //}}AFX_MSG 0\_R|i_`>  
  DECLARE_MESSAGE_MAP() ]Gd]KP@S  
}; VtPoc(o4]  
kGBl)0pr`x  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) PU@U@  
{ i*cE  
 //{{AFX_DATA_INIT(CAboutDlg) AVevYbucB  
 //}}AFX_DATA_INIT 2fL88/'  
} I8-&.RE  
k+m_L{#m5  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) *>&N t  
{ K_lCDiqG  
 CDialog::DoDataExchange(pDX); 0R%uVJG  
 //{{AFX_DATA_MAP(CAboutDlg) On96N|  
 //}}AFX_DATA_MAP S}xDB  
} (?&_6B.*  
! 4^L $  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ss*2TE7  
 //{{AFX_MSG_MAP(CAboutDlg) }~\].I6  
 // No message handlers H{tOCYyD  
 //}}AFX_MSG_MAP g!kRa.`u1  
END_MESSAGE_MAP() -Bwu$$0  
e,j? _p  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) L&gEQDPgq|  
: CDialog(CCaptureDlg::IDD, pParent) G/RheH G  
{ <GFB'`L  
 //{{AFX_DATA_INIT(CCaptureDlg) E6^S2J2  
  m_bControl = FALSE; W!Ct[t  
  m_bAlt = FALSE; ^J5V!i$  
  m_bShift = FALSE; t+)GB=C  
  m_Path = _T("c:\\"); EV7+u0uN&Q  
  m_Number = _T("0 picture captured."); ;|$]Qq  
  nCount=0; fdH'z:Xao  
  bRegistered=FALSE;  ?Ge*~d  
  bTray=FALSE; !#|fuOWe  
 //}}AFX_DATA_INIT 7rDRu]  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 PS<tS_.  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); m{yNnJ3O  
} "y ,(9_#  
7Hkf7\JY  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Xi`U`7?D(=  
{ [@FeRIu8  
 CDialog::DoDataExchange(pDX); ^CZ|ci6bX  
 //{{AFX_DATA_MAP(CCaptureDlg) kA :;c}p  
  DDX_Control(pDX, IDC_KEY, m_Key); L!8?2 \5  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); W2.1xNWO  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 6pz:Lfd80  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); AU?YZEAei  
  DDX_Text(pDX, IDC_PATH, m_Path); Ug'nr  
  DDX_Text(pDX, IDC_NUMBER, m_Number); uu/7Ie  
 //}}AFX_DATA_MAP 0@/E% T1c"  
} m&z %kVsg]  
7;s0m0<%~  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ;51!a C  
//{{AFX_MSG_MAP(CCaptureDlg) #&8pp8wd,}  
 ON_WM_SYSCOMMAND() ,HO/Q6;N  
 ON_WM_PAINT() 0v)mgrl=,  
 ON_WM_QUERYDRAGICON() ?bYQZJ>&  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) gl\{QcI8<  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) tlxjs]{0E  
 ON_BN_CLICKED(ID_CHANGE, OnChange) kd4*Zab  
//}}AFX_MSG_MAP +n~rM'^4/  
END_MESSAGE_MAP() 9M~$W-5  
\,#4+&4b  
BOOL CCaptureDlg::OnInitDialog() 7Hlh (k  
{ >5},qs:lZ  
 CDialog::OnInitDialog(); 3$G25=eN  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 2F@<{v4  
 ASSERT(IDM_ABOUTBOX < 0xF000); )xy{[ K|M(  
 CMenu* pSysMenu = GetSystemMenu(FALSE); /Ta0}Y(y  
 if (pSysMenu != NULL) 3)MM5 b b$  
 { iC0,zk4&  
  CString strAboutMenu; }~,cCtg:o  
  strAboutMenu.LoadString(IDS_ABOUTBOX); J3SbyI!T  
  if (!strAboutMenu.IsEmpty()) ;A'17B8  
  { l#f]KLv4N_  
   pSysMenu->AppendMenu(MF_SEPARATOR);  hahD.P<  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);  SSM> ID  
  } @:&dOqQ  
 } MJR\ g3  
 SetIcon(m_hIcon, TRUE); // Set big icon nPX'E`ut-V  
 SetIcon(m_hIcon, FALSE); // Set small icon [&k k  
 m_Key.SetCurSel(0); EBE>&{%$^  
 RegisterHotkey(); ,^[37/S  
 CMenu* pMenu=GetSystemMenu(FALSE); 0$h$7'a  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 6]A\8Ty  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); (eIxU&o'  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); -ddatc|  
 return TRUE; // return TRUE unless you set the focus to a control f! Nc+  
} 5:3$VWLa <  
krY.Cc]  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) WjxBNk'f  
{ U5%]nT"[]  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) t"Rf67  
 { mpJ_VS`  
  CAboutDlg dlgAbout; ?Lb7~XKt\  
  dlgAbout.DoModal(); Ps5wQaS  
 } YZu# 0)  
 else e7AI&5Eg{  
 { `l40awGCz  
  CDialog::OnSysCommand(nID, lParam); `X03Q[:q"[  
 } uXa}<=O  
} @9 tv N}  
2>$L>2$  
void CCaptureDlg::OnPaint() ! r\ktX  
{ wm[d5A4  
 if (IsIconic()) \Le #+ P  
 { zq>"a&Y,  
  CPaintDC dc(this); // device context for painting (MU7  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); F?Nk:# V  
  // Center icon in client rectangle =umS^fJ5`  
  int cxIcon = GetSystemMetrics(SM_CXICON); Ybiz]1d  
  int cyIcon = GetSystemMetrics(SM_CYICON); A^7Zy79  
  CRect rect; Ev ,8?  
  GetClientRect(&rect); Ekp 0.c8:  
  int x = (rect.Width() - cxIcon + 1) / 2; 4nXS9RiF2  
  int y = (rect.Height() - cyIcon + 1) / 2; UsKn4Kh  
  // Draw the icon pODo[Rkq  
  dc.DrawIcon(x, y, m_hIcon); 2;7GgO~  
 } S(s~4(o>8  
 else Z'M@DY/fdK  
 { 2Ps `!Y5  
  CDialog::OnPaint(); Rzj!~`&N  
 } [NDYJ'VGe  
} #Ih(2T i  
}eK*)  
HCURSOR CCaptureDlg::OnQueryDragIcon() \zDV|n~{w  
{ ZI]K+jza  
 return (HCURSOR) m_hIcon; nrhpI d  
} 4tKf  
AMfu|%ZL  
void CCaptureDlg::OnCancel() hzVO.Q*  
{ } /FM#Xh  
 if(bTray) r{;4(3E2  
  DeleteIcon(); 1#RA+d(  
  CDialog::OnCancel(); @3D%i#2o&[  
} zOp"n\  
S(xA}0]  
void CCaptureDlg::OnAbout() i<![i5uAI  
{ ]c+'SJQ  
 CAboutDlg dlg; j* ja)  
 dlg.DoModal(); 2l%iXK[  
} (acRYv(  
_~<TAFBr  
void CCaptureDlg::OnBrowse() uf3 gVS_h=  
{ I9aber1  
 CString str; .6(i5K  
 BROWSEINFO bi; Onyq'  
 char name[MAX_PATH];  .l'QCW9  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); `/iN%ZKum  
 bi.hwndOwner=GetSafeHwnd(); 9LRY  
 bi.pszDisplayName=name;  =7@  
 bi.lpszTitle="Select folder"; [a6lE"yr  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 3F3?be  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); >0$5H]1u  
 if(idl==NULL) L1+cv;t  
  return; p gi7 JQ  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); pYQs|5d  
 str.ReleaseBuffer(); sIM`Q%  
 m_Path=str; pc>R|~J{2  
 if(str.GetAt(str.GetLength()-1)!='\\') ;^]F~x}  
  m_Path+="\\"; SS-   
 UpdateData(FALSE); }DwXs`M7  
} Q5ao2-\   
s#sX r  
void CCaptureDlg::SaveBmp() )E|Bb=%  
{ >X,6  
 CDC dc; \NRRN eu|  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); % M:"Ai5:  
 CBitmap bm; JJO"\^,;~  
 int Width=GetSystemMetrics(SM_CXSCREEN); nV1, ):kh  
 int Height=GetSystemMetrics(SM_CYSCREEN); {QJ`.6Kt  
 bm.CreateCompatibleBitmap(&dc,Width,Height); %J'_c|EQM  
 CDC tdc; zE{zX@  
 tdc.CreateCompatibleDC(&dc); !<'R%<E3 Q  
 CBitmap*pOld=tdc.SelectObject(&bm); D':A-E  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Nrh`DyF0D!  
 tdc.SelectObject(pOld); 'ZZ/:MvQa  
 BITMAP btm; U)6JJv  
 bm.GetBitmap(&btm); ]5CFL$_Q{  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; dY^~^<{Lj  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); MDt4KD+bZ  
 BITMAPINFOHEADER bih; .d,Zx  
 bih.biBitCount=btm.bmBitsPixel; Z m>69gl  
 bih.biClrImportant=0; Kxn=iv^Ir  
 bih.biClrUsed=0; &bNj/n/  
 bih.biCompression=0; #/6X44 *u  
 bih.biHeight=btm.bmHeight; <Do89  
 bih.biPlanes=1; >~ :]+q  
 bih.biSize=sizeof(BITMAPINFOHEADER); 6w#v,RDEu  
 bih.biSizeImage=size; e V#H"fM  
 bih.biWidth=btm.bmWidth; wz57.e!Me=  
 bih.biXPelsPerMeter=0; sy?W\(x  
 bih.biYPelsPerMeter=0; fC[gu$f][  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); rCYn YA  
 static int filecount=0; hR2.w/2j  
 CString name; K(Nk|gQ  
 name.Format("pict%04d.bmp",filecount++); &/" qOZAs  
 name=m_Path+name; E&AR=yqk  
 BITMAPFILEHEADER bfh; w.jATMJ)F  
 bfh.bfReserved1=bfh.bfReserved2=0; 'AU!xG6OQ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); /:)4tIV  
 bfh.bfSize=54+size; }I0^nv1  
 bfh.bfOffBits=54; 6W o7q\"  
 CFile bf; ubw ]}sfM#  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ MmB-SR[>P  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); BN67o]*]<  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); =v}.sJ V?  
  bf.WriteHuge(lpData,size); <dZ{E7l  
  bf.Close(); 'S\H% -  
  nCount++; 'lF|F+8   
 } EOiKwhrV  
 GlobalFreePtr(lpData); fr7/%{s  
 if(nCount==1) /WMLr5  
  m_Number.Format("%d picture captured.",nCount); )/Vr 5b@  
 else a &j?"o  
  m_Number.Format("%d pictures captured.",nCount); f.{0P-Np  
  UpdateData(FALSE); ( KrIMZ  
} ~kga+H  
f\JyN@w+  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) hV%l}6yS&  
{ _<$=n6#  
 if(pMsg -> message == WM_KEYDOWN) hG U &C]  
 { ),_bDI L+  
  if(pMsg -> wParam == VK_ESCAPE) HD>{UU?  
   return TRUE; utXcfKdt  
  if(pMsg -> wParam == VK_RETURN) i8]r }a  
   return TRUE; !WmpnPr1  
 } 9z?F_=PB!  
 return CDialog::PreTranslateMessage(pMsg); @9L9c  
} k dqH36&<  
@ NF8?>!  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Z'~5L_.]Ai  
{ &*}S 0  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ pfG:P rZ  
  SaveBmp(); d$ /o\G  
  return FALSE; (.cT<(TB  
} d0,I] "  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ "v06F j>q  
 CMenu pop; )]}*oO  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); BsAglem  
 CMenu*pMenu=pop.GetSubMenu(0); @UA>6F  
 pMenu->SetDefaultItem(ID_EXITICON); :5(TOF  
 CPoint pt; LLMkv!%D  
 GetCursorPos(&pt);  Y+N87C<  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); sr\MQ?\fB  
 if(id==ID_EXITICON) )c*~Y=f  
  DeleteIcon(); z t1Q_;  
 else if(id==ID_EXIT) W$&Q.Z  
  OnCancel(); m-:k]9I  
 return FALSE; Oj2[(7 mO/  
} TCYnErqk  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); (]JJ?aAF  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) %+.]>''a  
 AddIcon(); S'WmPv  
 return res; _MR2,mC  
} $]vR,E  
{>:2Ff]O:  
void CCaptureDlg::AddIcon() cIX59y#7  
{ `U1"WcN  
 NOTIFYICONDATA data; 3ySnAAG  
 data.cbSize=sizeof(NOTIFYICONDATA); Au {`o xD  
 CString tip; zAH+{4lC+  
 tip.LoadString(IDS_ICONTIP); 9H<:\-:  
 data.hIcon=GetIcon(0); o8" [6Ys  
 data.hWnd=GetSafeHwnd(); c}Qc2D3*  
 strcpy(data.szTip,tip); O;XF'r_  
 data.uCallbackMessage=IDM_SHELL; Og["X0j  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; uGv+c.~[j  
 data.uID=98; 9'tM65K  
 Shell_NotifyIcon(NIM_ADD,&data); I%ez_VG  
 ShowWindow(SW_HIDE); (z[cf|he  
 bTray=TRUE; :KFhryN  
} pD]Ry" ZG  
?TXFOr]g]2  
void CCaptureDlg::DeleteIcon() b x@CzXre;  
{ -{O2Nv-]]  
 NOTIFYICONDATA data; 6Hz=VhQrN  
 data.cbSize=sizeof(NOTIFYICONDATA); -*WD.|k  
 data.hWnd=GetSafeHwnd(); &,\S<B2.  
 data.uID=98; U;^{uQJ+,  
 Shell_NotifyIcon(NIM_DELETE,&data); \3KCZ  
 ShowWindow(SW_SHOW); `@ObM[0p(  
 SetForegroundWindow(); {>i'Pb0mG|  
 ShowWindow(SW_SHOWNORMAL); v4&*iT  
 bTray=FALSE; 5W'T7asOh  
} wxoBq{r;  
L3/ua  
void CCaptureDlg::OnChange() j8PK\j[  
{ x&;SLEM   
 RegisterHotkey(); Awj`6GeJ  
} (<f[$ |%  
N>/U%01a  
BOOL CCaptureDlg::RegisterHotkey() wC[J=:]tA5  
{ -0W;b"]+A  
 UpdateData(); +n0y/0Au  
 UCHAR mask=0; 0]Li "Wb  
 UCHAR key=0; ]t,ppFC#  
 if(m_bControl) qn<~ LxQ  
  mask|=4; V7&L+]!  
 if(m_bAlt) qvT9d7x  
  mask|=2; JeO(sj$e  
 if(m_bShift) ]@'YlPU  
  mask|=1; ";jhj:Xj  
  key=Key_Table[m_Key.GetCurSel()]; L 0|u^J  
 if(bRegistered){ rR7}SEa  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); m1(rAr1  
  bRegistered=FALSE; dkXK0k  
 } )'qZ6%  
 cMask=mask; s^ 6S{XJ  
 cKey=key; +>s[w{Svy  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); K <0ItN v  
 return bRegistered; p1Els /|  
} WUHijHo5(8  
UE(%R1Py  
  四、小结 9@!`,Co  
b&!X#3(KT  
  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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