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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: !m y8AWO'  
  M\2"gT-LV  
  一、实现方法 jai|/"HSXw  
Gi?_ujZR  
  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: *yaw$oB  
*3+-W  
#pragma data_seg("shareddata") ,/2LY4` 5  
HHOOK hHook =NULL; //钩子句柄 `jsEN ;<  
UINT nHookCount =0; //挂接的程序数目 q{' ~+Nq  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 "v]%3i.* -  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 c:hK$C)T  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Gt-UJ-RR y  
static int KeyCount =0; $:bih4 @>  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 a)s;dp}T%  
#pragma data_seg() 9;=dxWf   
eph)=F$  
  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。 7{M>!} rY  
EU+cca|qS9  
  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: M0'v&g  
`DW2spd  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR hv)8K'u  
cKey,UCHAR cMask) {})$ 99"x  
{ + ,4" u  
 BOOL bAdded=FALSE; e@]-D FG  
 for(int index=0;index<MAX_KEY;index++){ ff2d @P,!  
  if(hCallWnd[index]==0){ %,V YiW0  
   hCallWnd[index]=hWnd; E`;;&V q-  
   HotKey[index]=cKey; 5J.0&Dda  
   HotKeyMask[index]=cMask; )e%}b -I'r  
   bAdded=TRUE; !]koSw}  
   KeyCount++; @F5f"8!.\  
   break; <nHkg<O6Y  
  } w=_Jc8/.  
 } 4 J^Q]-Z  
 return bAdded; k4\UK#ODe  
} 4{na+M  
//删除热键 S\x=&Rz  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) p9[6^rjx8  
{ > s EjR!  
 BOOL bRemoved=FALSE; -j2 (R?a  
 for(int index=0;index<MAX_KEY;index++){ -K %5(Eg  
  if(hCallWnd[index]==hWnd){ \OwpD,'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ v/Pw9j!r;m  
    hCallWnd[index]=NULL; +s[\g>i  
    HotKey[index]=0; 2& LQg=O  
    HotKeyMask[index]=0; aMuVqZw  
    bRemoved=TRUE; }SfbCa)UO  
    KeyCount--; 7[#xOZT  
    break; (/{aJV  
   } z~oDWANP  
  } 4 gBp8*2  
 } >)nS2b OE  
 return bRemoved; onei4c>@  
} -*ELLY[  
#%,RJMv  
G=/k>@Di  
  DLL中的钩子函数如下: gwB\<rzG  
msx-O=4g  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) +Ic ~ f1zh  
{ k5BXirB  
 BOOL bProcessed=FALSE; 3'I^lc  
 if(HC_ACTION==nCode) !u|Tu4G^  
 { MmoR~~*  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 t%VDRZo7  
   switch(wParam) ]`o!1(GA  
   {  Ud%s^A-qS  
    case VK_MENU: =\kMXB  
     MaskBits&=~ALTBIT; RrV>r<Z"Q  
     break; 'S4)?Z  
    case VK_CONTROL: '0aG N<c  
     MaskBits&=~CTRLBIT; +OaUP*\Dd  
     break; /pH(WHT+/H  
    case VK_SHIFT: + %*&.@z_  
     MaskBits&=~SHIFTBIT; Qs 2.ef?  
     break; <, @%*G1-  
    default: //judge the key and send message #J\rv'  
     break; *|:Q%xr-  
   } 7L(e h7  
   for(int index=0;index<MAX_KEY;index++){  J m{  
    if(hCallWnd[index]==NULL) ^_5|BT@  
     continue; &Z("D7.G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n{5NNV6  
    { m?CZQq,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4mYCSu14:`  
     bProcessed=TRUE; ?8V UO x  
    } s|yVAt|=  
   }  1jCo  
  } (c\hy53dP  
  else if((lParam&0xc000ffff)==1){ //有键按下 2a=sm1?  
   switch(wParam) PD[z#T!'  
   { s'HD{W`  
    case VK_MENU: db72W x0>  
     MaskBits|=ALTBIT; ;@mRo`D`  
     break; Sr Ca3PA  
    case VK_CONTROL: _'0 @%P%  
     MaskBits|=CTRLBIT; X"asfA[6K  
     break; },-*  
    case VK_SHIFT: wEft4 o  
     MaskBits|=SHIFTBIT; 'o4p#`R:8  
     break; XFwLz  
    default: //judge the key and send message ub:ly0;t  
     break; D)$8 W[  
   } f>9s!Hpu_  
   for(int index=0;index<MAX_KEY;index++){ ?? qq:`s  
    if(hCallWnd[index]==NULL) k)\gWPH  
     continue; %CnxjtTo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) OEhHR  
    { W#w.h33)#6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Do7=#|bAM  
     bProcessed=TRUE; Vzlh+R>c  
    } uBnoQ~Qd[z  
   } K!z`  
  } kQ>^->w  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 AC%JC+  
   for(int index=0;index<MAX_KEY;index++){ MHj,<|8Q  
    if(hCallWnd[index]==NULL) |pZUlQbb  
     continue; m"2d$vro"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) (K..k-o`.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); E)N<lh  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 8AFczeg[[  
   } 3)Ac"nuyqH  
  } O~Wt600{E  
 } s Kicn5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); T Eu'*>g  
} /1w2ehE<  
:\ QUs}  
  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: .3qu9eP   
.Nm su+s  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T? ,P*l  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "UVFU-Z  
s0u{d qP  
  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: F _3:bX  
AvJ,SQt  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gN6rp(?y  
{ X"MU3]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ->{d`-}m'  
 { <W)u{KS#TY  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 A=5epsB  
  SaveBmp(); q%YV$$c   
  return FALSE; R,2P3lv1v@  
 } nR;D#"p%  
 …… //其它处理及默认处理 Ddju~510  
} 25y6a|`  
Ucw yxX I  
_Xcn N:Rt  
  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。 `YBkF  
Y4.Eq+$gh  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 GwU?wIIj^  
9O*_L:4o  
  二、编程步骤 8|?LN8rp  
&^&zR(o`  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; +UN<Zp7I/  
,3i,P(?(  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Y.#:HRtgW  
p,g1eb|E  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ^L4Qbc(vJ  
~X(UcZ2  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; bvBHYf:^  
wN-i?Ek0;  
  5、 添加代码,编译运行程序。 1j-te-}"c  
^D^JzEy'?C  
三、程序代码 revF;l6->C  
%^. %OCX:  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL yL4 T  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) |R/.r_x,V?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ d)o!5L  
#if _MSC_VER > 1000 Ck =;1sGh  
#pragma once B$Z3+$hfF  
#endif // _MSC_VER > 1000 P,DC7\  
#ifndef __AFXWIN_H__ T'-FV  
#error include 'stdafx.h' before including this file for PCH "t=hzn"~%  
#endif Joe_PS  
#include "resource.h" // main symbols :G w~7v_  
class CHookApp : public CWinApp >ydRSr^  
{ hg@}@Wq\)  
 public: 3 voT^o  
  CHookApp(); d&8APe  
  // Overrides tMx}*l|]  
  // ClassWizard generated virtual function overrides Q;Wj?8}  
  //{{AFX_VIRTUAL(CHookApp) [Qt?W gPj  
 public: #L}+H!Myh  
  virtual BOOL InitInstance(); V D?*h  
  virtual int ExitInstance(); Uh1NO&i.W  
  //}}AFX_VIRTUAL ?']h%'Q  
  //{{AFX_MSG(CHookApp) /e}#' H   
  // NOTE - the ClassWizard will add and remove member functions here. P>Euq'ajX  
  // DO NOT EDIT what you see in these blocks of generated code ! S"mcUU}}  
  //}}AFX_MSG )3<:tV8   
  DECLARE_MESSAGE_MAP() h&3YGCl  
}; S{Hx]\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); gy: %l  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); i`(^[h ?;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  Qe"pW\  
BOOL InitHotkey(); FbnO/! $8  
BOOL UnInit(); cXMhq<GkAA  
#endif G.'+-v=\]  
 6Si-u  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 5v\!]?(O;  
#include "stdafx.h" ma$Prd  
#include "hook.h" !}+tdT(y  
#include <windowsx.h> {Hmo1|_S|  
#ifdef _DEBUG ^-CINt{O  
#define new DEBUG_NEW \'CN  
#undef THIS_FILE DmVP  
static char THIS_FILE[] = __FILE__; GV6K/T :  
#endif p}b/XnV$~  
#define MAX_KEY 100 pg+[y<B  
#define CTRLBIT 0x04 wu9=N ^x  
#define ALTBIT 0x02 o'<^LYSnB  
#define SHIFTBIT 0x01 bOp54WI-g  
#pragma data_seg("shareddata") ~9\WFF/  
HHOOK hHook =NULL; \qvaE+  
UINT nHookCount =0; u}bf-;R  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ow=UtA-^O  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Si 9Z>MR  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Q^K"8 ;  
static int KeyCount =0; ]{~NO{0@Y  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift [[~w0G~1  
#pragma data_seg() g42)7  
HINSTANCE hins; `cQo0{xK  
void VerifyWindow(); F 09DV<j  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) $eV$2p3H  
//{{AFX_MSG_MAP(CHookApp) :4S%'d7  
// NOTE - the ClassWizard will add and remove mapping macros here. pCpb;<JG  
// DO NOT EDIT what you see in these blocks of generated code! 4F>Urh+  
//}}AFX_MSG_MAP t&Os;x?To?  
END_MESSAGE_MAP() )Rat0$6  
9mc!bj^811  
CHookApp::CHookApp() R2L;bGI*J  
{ 8mLP5s!7  
 // TODO: add construction code here, L\{IljA  
 // Place all significant initialization in InitInstance Lj\/Ji_  
} ik|-L8  
-7uwOr  
CHookApp theApp; [OTJVpC  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) b*fgv9Kh'  
{ [+ *$\  
 BOOL bProcessed=FALSE; /WV7gO&L1  
 if(HC_ACTION==nCode) >R{qESmP=  
 { 1 Q-bYJG  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8l?piig#  
   switch(wParam) B<8N96fx  
   { I-]>d;4.  
    case VK_MENU: *rZ^^`4R  
     MaskBits&=~ALTBIT; J?JeU/:+  
     break; GSoZx0  
    case VK_CONTROL: qrvsjYi*w  
     MaskBits&=~CTRLBIT; dUgrKDNyA  
     break; Uq_j\A;c  
    case VK_SHIFT: ' /Bidb?  
     MaskBits&=~SHIFTBIT; UmnE@H"t$\  
     break; e6X[vc|Y}  
    default: //judge the key and send message -"Y{$/B  
     break; D9mz9  
   } 2-zT$`[]J  
   for(int index=0;index<MAX_KEY;index++){ V]c;^  
    if(hCallWnd[index]==NULL) KD1=Y80P  
     continue; =ItkFjhBc  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z)XRx:YU;$  
    { < _$%@4 L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); bk<\ujH  
     bProcessed=TRUE; Sx:Ur>?hd5  
    } "xMD,}+5$$  
   } 1Kvx1p   
  } i`/+,<  
  else if((lParam&0xc000ffff)==1){ //Key down b5m=7;u*h  
   switch(wParam) MC 0TaP  
   { #zrTY9m7  
    case VK_MENU: e}@)z3Q<l  
     MaskBits|=ALTBIT; `6y{.$ z  
     break; P X;Ed*y  
    case VK_CONTROL: /:<IIqO.  
     MaskBits|=CTRLBIT; _UE)*l m+  
     break; z|?R/Gf8  
    case VK_SHIFT: q1y/x@  
     MaskBits|=SHIFTBIT; 7:]Pl=:X  
     break; J`IDlGFYp  
    default: //judge the key and send message G a;.a  
     break; M L7 \BT  
   } Ov-b:l H  
   for(int index=0;index<MAX_KEY;index++) Gc.P,K/hr  
   { 2 nb:)  
    if(hCallWnd[index]==NULL) 2RF^s.W  
     continue;  $rXh0g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) r[.>P$U  
    { obK*rdg ,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9p 4"r^  
     bProcessed=TRUE; Obw?_@X  
    } '^%~JyU  
   } )CI1;  
  } ~9F,%  
  if(!bProcessed){ 4E8JT#&  
   for(int index=0;index<MAX_KEY;index++){ Xd:7"/:r  
    if(hCallWnd[index]==NULL) VN4yn| f/  
     continue; !@u>A_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 30PZ{c&Rll  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); PqNFyQkl  
   } <)g8y A  
  } Sz{O2 l Y  
 } c[}(O H  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); C ]Si|D  
} 6m.k;'  
~,D@8tv  
BOOL InitHotkey() p3ISWJa!  
{ `"iY*  
 if(hHook!=NULL){ Q@e[5RA +]  
  nHookCount++; Mcw4!{l`  
  return TRUE; n[Zz]IO,g  
 } ` b !5^W  
 else O2{)WWOT  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); lcON+j  
  if(hHook!=NULL) *5sBhx  
   nHookCount++; JO&JP3N1  
  return (hHook!=NULL); $&|y<Y=  
} sUl6hX4  
BOOL UnInit() s6 ( z  
{ ?#0snlah|  
 if(nHookCount>1){ D PrBFmHF  
  nHookCount--; >}~#>Ru  
  return TRUE; /wQL  
 } ]DFXPV  
 BOOL unhooked = UnhookWindowsHookEx(hHook); U,/6;}  
 if(unhooked==TRUE){ eLwTaW !C  
  nHookCount=0; ;E~4)^  
  hHook=NULL; K\[!SXg@  
 } y AF+bCXo  
 return unhooked; ~5ZvOX6L2  
} zJa)*N  
"Th$#3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) , xx6$uZ  
{ ?%R w(E  
 BOOL bAdded=FALSE; |eoid?=  
 for(int index=0;index<MAX_KEY;index++){ qo+N,x9o  
  if(hCallWnd[index]==0){ &m3.h!dq  
   hCallWnd[index]=hWnd; BE&B}LfvfO  
   HotKey[index]=cKey; Xqp|VbDca  
   HotKeyMask[index]=cMask; JXiZB 8}  
   bAdded=TRUE; })vOaYT|-  
   KeyCount++; !.7udYmB  
   break; D0Z\Vvy  
  } RO\gax  
 } "`}~~.q  
 return bAdded; pDPxl?S  
} Uu6L~iB  
_ |<d5TI  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k.h`Cji@  
{ Ap&)6g   
 BOOL bRemoved=FALSE; C2]Kc{4  
 for(int index=0;index<MAX_KEY;index++){ ]u-SL md  
  if(hCallWnd[index]==hWnd){ "_L?2ta  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ci,+Bjc  
    hCallWnd[index]=NULL; fkfZ>D^1  
    HotKey[index]=0; ?wMHS4  
    HotKeyMask[index]=0; ||2Q~*:  
    bRemoved=TRUE; hf!|\f  
    KeyCount--; qv 3^5 d  
    break; ~:;3uL s,8  
   } lM\LN^f5*  
  } zHB_{(o7  
 } I4H`YOD%  
 return bRemoved; #)+- lPe  
} O|kKwadC  
oC*ees g_  
void VerifyWindow() 71FeDpe  
{ &zL#hBE  
 for(int i=0;i<MAX_KEY;i++){ '/0#lF  
  if(hCallWnd!=NULL){ >QQ(m\a$  
   if(!IsWindow(hCallWnd)){ x9>\(-uU  
    hCallWnd=NULL; )!9Ifk0KH  
    HotKey=0; |YJCWFbs8  
    HotKeyMask=0; @54*.q$  
    KeyCount--; rt]S\  
   } ofc.zwH  
  } ,reJ(s  
 } ~ <0Z>qr  
} -ML6d&cm  
B,$l4m4  
BOOL CHookApp::InitInstance() &znH!AQ0  
{ HgBJf~q~U  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); n[xkSF^)  
 hins=AfxGetInstanceHandle(); ]*"s\ix  
 InitHotkey(); XY7Qa!>7j  
 return CWinApp::InitInstance(); Ar9nBJ`  
} /k\01hc`  
*xRc * :0  
int CHookApp::ExitInstance() 2H#N{>7  
{ AH7L.L+$M  
 VerifyWindow(); .;/L2Jv  
 UnInit(); S^RUw  
 return CWinApp::ExitInstance(); r2*<\ax  
} <T,A&`/  
`ue[q!Qq  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ~d>%,?zz  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 'aJgLws*w  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Lrz3   
#if _MSC_VER > 1000  ~m=EM;  
#pragma once uPyVF-i  
#endif // _MSC_VER > 1000 Pd=,$UQp  
;Kxbg>U  
class CCaptureDlg : public CDialog OTvROJP  
{ $j` $[tX6l  
 // Construction ]o.vB}WsY  
 public: \9c$`nn  
  BOOL bTray; ,+/zH'U}  
  BOOL bRegistered; ;|ub!z9GG  
  BOOL RegisterHotkey(); >G)qns9  
  UCHAR cKey; dT@UK^\  
  UCHAR cMask; 4z4v\IpB  
  void DeleteIcon(); o.:p_(|hI  
  void AddIcon(); @9 8;VWY\  
  UINT nCount; H>7dND 2;  
  void SaveBmp(); kN9yO5 h7  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ,krS-.  
  // Dialog Data ND]S(C"?  
  //{{AFX_DATA(CCaptureDlg) "Tbnxx]J  
  enum { IDD = IDD_CAPTURE_DIALOG }; C? m,ta3  
  CComboBox m_Key; =Z0t :{  
  BOOL m_bControl; ,cHU) j  
  BOOL m_bAlt; :Z`4j  
  BOOL m_bShift; c,5n, i  
  CString m_Path; $N+6h#  
  CString m_Number; "X1vZwK8N  
  //}}AFX_DATA *$,+`+  
  // ClassWizard generated virtual function overrides i s"vekC  
  //{{AFX_VIRTUAL(CCaptureDlg) "ORzWnE4U  
 public: E{^^^"z P  
  virtual BOOL PreTranslateMessage(MSG* pMsg); :xeLt;  
 protected: *_hLD5K!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support WO</Q6+  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); GG-[`!>.pw  
  //}}AFX_VIRTUAL O&?.&h  
  // Implementation s"#]L44N  
 protected: $3 8gs{+  
  HICON m_hIcon; -f>'RI95>  
  // Generated message map functions I lG:X)V%  
  //{{AFX_MSG(CCaptureDlg) \P?ToTTV  
  virtual BOOL OnInitDialog(); L/r{xS  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); D5A=,\uk  
  afx_msg void OnPaint(); 0Qd%iP)6  
  afx_msg HCURSOR OnQueryDragIcon(); ym%slg  
  virtual void OnCancel(); Df=q-iq<{/  
  afx_msg void OnAbout(); TQ9'76INb  
  afx_msg void OnBrowse(); 1 p\Ak  
  afx_msg void OnChange(); z]#hWfM4B:  
 //}}AFX_MSG B4W\ t{  
 DECLARE_MESSAGE_MAP() 2"/yEg*=  
}; 7 ^I:=qc72  
#endif ey1Z/|  
5{l1A (b  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file :$H!@n*/R  
#include "stdafx.h" k$[{n'\@  
#include "Capture.h" v[#)GB _5  
#include "CaptureDlg.h" cdp0!W4Gi  
#include <windowsx.h> D1"7s,Hmu  
#pragma comment(lib,"hook.lib") /8eW@IO.F  
#ifdef _DEBUG C ?7X"~ ~  
#define new DEBUG_NEW I6dm@{/:>  
#undef THIS_FILE D s-`  
static char THIS_FILE[] = __FILE__; y4F^|kS) [  
#endif gg]~2f  
#define IDM_SHELL WM_USER+1 -J$g(sikt  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F$Pp]"82'm  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K3ukYR  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; $Ub}p[L  
class CAboutDlg : public CDialog U6{dI@|B  
{ :,F=w0O  
 public: )SiY(8y  
  CAboutDlg(); J+2R&3;_O  
  // Dialog Data *8\(FVyG^  
  //{{AFX_DATA(CAboutDlg) D Vw Cx^  
  enum { IDD = IDD_ABOUTBOX }; o/JPYBhdl  
  //}}AFX_DATA k&GHu0z  
  // ClassWizard generated virtual function overrides a!t V6H  
  //{{AFX_VIRTUAL(CAboutDlg) *T4ge|zUc  
 protected: ,P@QxnQ   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?0J0Ij,  
  //}}AFX_VIRTUAL Zoow*`b|$U  
  // Implementation Ak=UtDN[  
 protected: 5-'vB  
  //{{AFX_MSG(CAboutDlg) <o@)SD~K  
  //}}AFX_MSG 2V$9ei6  
  DECLARE_MESSAGE_MAP() F0;1zw  
}; <xF?~7  
`pYE[y+  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) N(R,8GF5G  
{ 3 jh|y,  
 //{{AFX_DATA_INIT(CAboutDlg) ,OB&nN t>  
 //}}AFX_DATA_INIT Nmf#`+7gCI  
} <nA3Sd"QfV  
AQ}l%  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) l<RfRqjw  
{ \Da~p9 T&  
 CDialog::DoDataExchange(pDX); SJ(9rhB5*.  
 //{{AFX_DATA_MAP(CAboutDlg) {HuLuP 0t  
 //}}AFX_DATA_MAP MVAc8dS  
} ,k%8yK  
nHU3%%%cU  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) l$`G:%qHj  
 //{{AFX_MSG_MAP(CAboutDlg) ngqUH  
 // No message handlers \UQ],+H  
 //}}AFX_MSG_MAP @Z2/9K%1'  
END_MESSAGE_MAP() XI g|G}i.  
h544dNo&  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Kq6qXc\x  
: CDialog(CCaptureDlg::IDD, pParent) $K=z  
{ S ljZ~x,!  
 //{{AFX_DATA_INIT(CCaptureDlg) mh8nlB  
  m_bControl = FALSE; h.LSMU (O  
  m_bAlt = FALSE; B}5XRgq  
  m_bShift = FALSE; ,CW%JIM  
  m_Path = _T("c:\\"); L&HzN{K  
  m_Number = _T("0 picture captured."); m?vAyi  
  nCount=0; o}R|tOe  
  bRegistered=FALSE; :eLLDp<  
  bTray=FALSE; 2o}8W7y  
 //}}AFX_DATA_INIT }q x(z^  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 :+A; TV  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); nK:`e9ES  
} nP)-Y#`~7  
<^'{ G  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) V9]uFL  
{ {q2<KRU2+#  
 CDialog::DoDataExchange(pDX); Px#4pmz  
 //{{AFX_DATA_MAP(CCaptureDlg) Sh47c4{  
  DDX_Control(pDX, IDC_KEY, m_Key); m[#%/  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); )XZ,bz*jn  
  DDX_Check(pDX, IDC_ALT, m_bAlt); iy9VruT<x  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Ko}7$2^  
  DDX_Text(pDX, IDC_PATH, m_Path); &@Yoj%%  
  DDX_Text(pDX, IDC_NUMBER, m_Number); WFks|D:sB  
 //}}AFX_DATA_MAP ~pwY6Q  
} pb= HVjW<  
6KBHRt  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) .=aMjrME  
//{{AFX_MSG_MAP(CCaptureDlg) 3?6Ber y=  
 ON_WM_SYSCOMMAND() X)FQ%(H<  
 ON_WM_PAINT() g&8.A(  
 ON_WM_QUERYDRAGICON() W.sD2f  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ,DQ >&_DK  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ],#ZPUn  
 ON_BN_CLICKED(ID_CHANGE, OnChange) m&{rBz0  
//}}AFX_MSG_MAP $q=hcu  
END_MESSAGE_MAP() ^:$j:w?j  
PE +qYCpP9  
BOOL CCaptureDlg::OnInitDialog() )%1&/uN)  
{ M{y|7e%K  
 CDialog::OnInitDialog(); c'[( d5^|  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); CTh1;U20  
 ASSERT(IDM_ABOUTBOX < 0xF000); f Y2l.H\f  
 CMenu* pSysMenu = GetSystemMenu(FALSE); !-@SS>  
 if (pSysMenu != NULL) wf^cyCR0  
 { _4De!q0(  
  CString strAboutMenu; lHRK'? Q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 0$(jBnE  
  if (!strAboutMenu.IsEmpty()) 4>d[qr*<  
  { A'w2GC{.  
   pSysMenu->AppendMenu(MF_SEPARATOR); 4O9tx_<JG  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); DOA[iT";4  
  } !DCVoc]pV  
 } LE Jlo%M  
 SetIcon(m_hIcon, TRUE); // Set big icon /Ir 7 DZK  
 SetIcon(m_hIcon, FALSE); // Set small icon 7YSuB9{M  
 m_Key.SetCurSel(0); @#J H=-06  
 RegisterHotkey(); Y-?51g[u  
 CMenu* pMenu=GetSystemMenu(FALSE); ;2 \<M 6  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); eq7C]i rH  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); W>UjUq);  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ">0 /8]l  
 return TRUE; // return TRUE unless you set the focus to a control jR }*bIzv  
} _qdWQFuM  
^O?l9(=/u  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Z7ZWf'o  
{ yzODF>KJ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) :  ,|=Q}  
 { (u$!\fE-et  
  CAboutDlg dlgAbout; c lq <$-  
  dlgAbout.DoModal(); E%KC'T N^D  
 } ei(| 5h  
 else R#r h  
 { \Gv-sA  
  CDialog::OnSysCommand(nID, lParam); /<G yg7o0  
 } 4j2~"K  
} U Ek |8yq  
7UY('Q[  
void CCaptureDlg::OnPaint() pyGFDB5_P  
{ &FT5w T  
 if (IsIconic()) *s 1D\/H  
 { ,<I L*=a  
  CPaintDC dc(this); // device context for painting Z{j!s6Y@{  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Iht mD@H}  
  // Center icon in client rectangle 4"`=huQ  
  int cxIcon = GetSystemMetrics(SM_CXICON); GA}hp%  
  int cyIcon = GetSystemMetrics(SM_CYICON); kjQIagw  
  CRect rect; X:iG[iU*  
  GetClientRect(&rect); %l0_PhAB  
  int x = (rect.Width() - cxIcon + 1) / 2; Z%(Df3~gmm  
  int y = (rect.Height() - cyIcon + 1) / 2; k|)^!BdO  
  // Draw the icon [j]}$f Fe  
  dc.DrawIcon(x, y, m_hIcon); ZC>`ca  
 } + ;{rU&  
 else ,=x.aX Spz  
 { ixoMccU0  
  CDialog::OnPaint(); ~`a#h#  
 } h/fb<jIP1  
} ~QQEHx\4zZ  
@8T Vr2uy  
HCURSOR CCaptureDlg::OnQueryDragIcon() qhv4R|)  
{ il 8A&`%  
 return (HCURSOR) m_hIcon; P W0q71  
} w0F:%:/  
m7bn%j-{$f  
void CCaptureDlg::OnCancel() |^>L`6uo  
{ ^$ g],PAY  
 if(bTray) 5+#?7J1  
  DeleteIcon(); l[ZQ7$kL  
  CDialog::OnCancel(); S.?\>iH[  
} |>m# m*{S  
!ds"88:5^  
void CCaptureDlg::OnAbout() 1VPfa  
{ t/EMBfLc  
 CAboutDlg dlg; "m<eHz]D  
 dlg.DoModal(); ` :B  
} kfG65aa>_  
[7ek;d;'t  
void CCaptureDlg::OnBrowse() B[2h   
{ I=3B 5u  
 CString str; ".Q!8j"@f  
 BROWSEINFO bi; xOX*=Wv  
 char name[MAX_PATH]; (PE8H~d  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); d[qEP6B  
 bi.hwndOwner=GetSafeHwnd(); 3z{5c   
 bi.pszDisplayName=name; T5X'D(\|  
 bi.lpszTitle="Select folder"; hc31+TL  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; P*nT\B  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); J_((o  
 if(idl==NULL) qJAv=D  
  return; 4N0W& Dy  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ;^*+:e  
 str.ReleaseBuffer(); <LOx.}fv  
 m_Path=str; d%[`=fs]|m  
 if(str.GetAt(str.GetLength()-1)!='\\') n+A'XBHk  
  m_Path+="\\"; N";dG 3  
 UpdateData(FALSE); e-duZ o  
} DftGy:Ah3  
0wa!pE"  
void CCaptureDlg::SaveBmp() Ot8S'cB1,$  
{ %o _0M^3W  
 CDC dc; CzDR%vx  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); V+@%(x@D_  
 CBitmap bm; 6=`m   
 int Width=GetSystemMetrics(SM_CXSCREEN); o )}<   
 int Height=GetSystemMetrics(SM_CYSCREEN); ytcG6WN3  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Ty,)mx){)  
 CDC tdc; _|5FrN  
 tdc.CreateCompatibleDC(&dc); ~_^o?NE,  
 CBitmap*pOld=tdc.SelectObject(&bm); Yqz[sz5+m  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ky lrf4=  
 tdc.SelectObject(pOld); \w@_(4")Qb  
 BITMAP btm; Rs( CrB/M  
 bm.GetBitmap(&btm); H--*[3".  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; q4#f *]  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Y|qixpP  
 BITMAPINFOHEADER bih; 9OO_Hp#|9  
 bih.biBitCount=btm.bmBitsPixel; BD-c 0-+m  
 bih.biClrImportant=0; ,oi`BOh  
 bih.biClrUsed=0; wDC/w[4:  
 bih.biCompression=0; O%Gsk'mo  
 bih.biHeight=btm.bmHeight; lXL7q?,9  
 bih.biPlanes=1; "8iyMP%8  
 bih.biSize=sizeof(BITMAPINFOHEADER); |?t8M9[Z  
 bih.biSizeImage=size; {dr&46$p  
 bih.biWidth=btm.bmWidth; >Qbc(}w  
 bih.biXPelsPerMeter=0; ?U9d3] W  
 bih.biYPelsPerMeter=0; p9] 7g%  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 2ZzD^:V[}  
 static int filecount=0; ~)_ ?:.Da  
 CString name; :pF]TY"K.  
 name.Format("pict%04d.bmp",filecount++); O]r3?=  
 name=m_Path+name; la"A$Tbu~  
 BITMAPFILEHEADER bfh; G*w W&R)  
 bfh.bfReserved1=bfh.bfReserved2=0; re 1k]  
 bfh.bfType=((WORD)('M'<< 8)|'B'); g:3'x/a1  
 bfh.bfSize=54+size; A>1p]#  
 bfh.bfOffBits=54; ]3 8<ly7  
 CFile bf; GPqB\bxb'  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ pQ-^T.'  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); E{]|jPdr  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,IZxlf%  
  bf.WriteHuge(lpData,size); U"Ob@$ROFy  
  bf.Close(); LkZo/K~  
  nCount++; He_(JXTP  
 } +}L3T"  
 GlobalFreePtr(lpData);  '?>O  
 if(nCount==1) 6Cv2>'{S  
  m_Number.Format("%d picture captured.",nCount); R&|)y:bg|  
 else u$@I/q,ou  
  m_Number.Format("%d pictures captured.",nCount); g!) LhE  
  UpdateData(FALSE); Kac j  
} V<7K!<g)b  
eYSGxcx  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) JW.&uV1Z  
{ 6UAxl3-\  
 if(pMsg -> message == WM_KEYDOWN) zam0(^=  
 { gl\$jDC9  
  if(pMsg -> wParam == VK_ESCAPE) Zow^bzy4  
   return TRUE; !m:PBl5  
  if(pMsg -> wParam == VK_RETURN) HF=C8ZtlL  
   return TRUE; ?;#3U5$v  
 } _(kwD^x6O{  
 return CDialog::PreTranslateMessage(pMsg); [ *a>{sO[  
} }br<2?y,  
> FcA ,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) C05{,w?  
{ cyP* QW[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ BNoCE!  
  SaveBmp(); .q[sk  
  return FALSE; pz6- hi7  
} =|&"/$+s  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ |iJZC  
 CMenu pop; }/}`onRZ  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); eHyuO)(xH1  
 CMenu*pMenu=pop.GetSubMenu(0); =v`&iL~m  
 pMenu->SetDefaultItem(ID_EXITICON); JOne&{h]J"  
 CPoint pt; o[r6sz:  
 GetCursorPos(&pt); 86 /i~s  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); whZ],R*u  
 if(id==ID_EXITICON) H_f2:Za  
  DeleteIcon(); dv}R]f'  
 else if(id==ID_EXIT) jL).B&  
  OnCancel(); JP*wi-8D  
 return FALSE; Y'H/ $M N  
} xdU pp~}+.  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); QM=436fq  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) kc']g:*]Y  
 AddIcon(); WK)k-A^q  
 return res; R.'Gg  
} _p2<7x i   
VRP.tD  
void CCaptureDlg::AddIcon() ef ;="N  
{ {Qmb!`F  
 NOTIFYICONDATA data; uqeWdj*Y  
 data.cbSize=sizeof(NOTIFYICONDATA); G:ngio]G0  
 CString tip; b%t9a\0V  
 tip.LoadString(IDS_ICONTIP); E_uH' E  
 data.hIcon=GetIcon(0);  jy|xDQ  
 data.hWnd=GetSafeHwnd(); ssbyvzQ  
 strcpy(data.szTip,tip); 'n.9qxY;  
 data.uCallbackMessage=IDM_SHELL; @gGuV$Mw  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; {QkH%jj  
 data.uID=98; +~.Jw#HqS  
 Shell_NotifyIcon(NIM_ADD,&data); Tka="eyIj3  
 ShowWindow(SW_HIDE); l hp:.  
 bTray=TRUE; $ rnr;V  
} q8v!{Os+#  
Guc^gq}  
void CCaptureDlg::DeleteIcon() cDyC&}:f  
{ J|8YB3K,  
 NOTIFYICONDATA data; y'wW2U/ 1-  
 data.cbSize=sizeof(NOTIFYICONDATA); KCT"a :\  
 data.hWnd=GetSafeHwnd(); +Z(VWu6  
 data.uID=98; Z'bMIdV  
 Shell_NotifyIcon(NIM_DELETE,&data); oDI*\S>  
 ShowWindow(SW_SHOW); 9TS=>  
 SetForegroundWindow(); 4DM|OL`w  
 ShowWindow(SW_SHOWNORMAL); D5vtZu!"  
 bTray=FALSE; RtQfE+  
} .u3W]5M|  
 o*1`,n  
void CCaptureDlg::OnChange() I _G;;GF  
{ ~mo `  
 RegisterHotkey(); _JO @O^Ndd  
} X1D:{S[  
w.- i !Ls  
BOOL CCaptureDlg::RegisterHotkey() /UyE- "S  
{ SP1oBR"3  
 UpdateData(); N |L5Ru  
 UCHAR mask=0; ,IATJs$E  
 UCHAR key=0; hd%F7D5  
 if(m_bControl) T5+b{qA  
  mask|=4; Ap9w H[H  
 if(m_bAlt) hrt-<7U  
  mask|=2; d>psqmQ  
 if(m_bShift) l(4./M  
  mask|=1; ,Gx=e!-N5  
  key=Key_Table[m_Key.GetCurSel()]; "g[UX{L  
 if(bRegistered){ _I5+o\;1  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); gcF><i6  
  bRegistered=FALSE; bvTkS EN  
 } zz*[JIe  
 cMask=mask; >9|+F [Fc  
 cKey=key; )Q?[_<1Y+  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); lI<8)42yq  
 return bRegistered; ka [NYW{.  
} D8XXm lo  
a,9GSKXo1  
  四、小结 sxa (  
{Vu:yh\<  
  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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