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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: }`y%*--  
  E?FUr?-[  
  一、实现方法 8GeJ%^0o}  
gu "@*,hL  
  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: ?4#UW7I  
dVSQG947i:  
#pragma data_seg("shareddata") P9)L1l<3I  
HHOOK hHook =NULL; //钩子句柄 ue*o>iohB  
UINT nHookCount =0; //挂接的程序数目 H 3so&_  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 =~TPrO^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 W[:CCCDL  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey `<-/e%8  
static int KeyCount =0; <k 'zz:[c!  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 s6k(K>Pl  
#pragma data_seg() S1#5oy2  
c8Nl$|B  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 Nw '$r  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: mFmxEv  
w:ASB>,!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ZgfhNI\  
cKey,UCHAR cMask) O1 !YHo  
{ mD%IHzbn H  
 BOOL bAdded=FALSE; [Z^26/5a  
 for(int index=0;index<MAX_KEY;index++){ sB5@6[VDI  
  if(hCallWnd[index]==0){ gs&F .n  
   hCallWnd[index]=hWnd; P$.$M}rMv  
   HotKey[index]=cKey; &crR nv ?  
   HotKeyMask[index]=cMask;  F*_+k  
   bAdded=TRUE; m'-QVZ{(M%  
   KeyCount++; Z7I\\M  
   break; yL %88,/  
  } VRTJKi  
 } Z23T 2  
 return bAdded; [6Q1yNE  
} )J?8"+_Y  
//删除热键 ]X> I(p@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) kN6 jX  
{ ,H_d#Koa.  
 BOOL bRemoved=FALSE; ~])Q[/=p  
 for(int index=0;index<MAX_KEY;index++){ ;I*N%a TK  
  if(hCallWnd[index]==hWnd){ MDBqIL]Hc  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~~@dbB  
    hCallWnd[index]=NULL; %,S{9q  
    HotKey[index]=0; o]WcODJdl  
    HotKeyMask[index]=0; k2(k0HFR  
    bRemoved=TRUE; h.wffk,  
    KeyCount--; yqH9*&KH{  
    break; g_J QW(_  
   } "wCx]{Di  
  } *'*n}fM  
 } u$FL(m4  
 return bRemoved;  % s@  
} B|.A6:1g+  
vdigw.=z  
,w f6gmh8  
  DLL中的钩子函数如下: cG&@PO]+.  
hcM9Sx"!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) B4*uS (  
{ kgI8PybY  
 BOOL bProcessed=FALSE; NkoyEa/^[  
 if(HC_ACTION==nCode) {9* l  
 { T-h[$fxR_  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开  T\#Gc4  
   switch(wParam) jrpki<D  
   {  I>q!co9n  
    case VK_MENU: H^dw=kS  
     MaskBits&=~ALTBIT; J#5V>7G  
     break; hiv {A9a?  
    case VK_CONTROL: _2{2Xb  
     MaskBits&=~CTRLBIT; gjx-tp 1.  
     break; qMoo#UX  
    case VK_SHIFT: xUNq!({T  
     MaskBits&=~SHIFTBIT; 5gkQ6& m  
     break; /N#=Tol  
    default: //judge the key and send message hAt4+O&P  
     break; ;GKL[ tI"  
   } `q`ah_  
   for(int index=0;index<MAX_KEY;index++){ zG{jRth  
    if(hCallWnd[index]==NULL) i'.D=o  
     continue; vz)R84   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {Us^ 4Xe  
    { NwdrJw9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >I-rsw2  
     bProcessed=TRUE; &3J^z7kU  
    } K4]#X"  
   } x!7r7|iV  
  } i6$HwRZm#  
  else if((lParam&0xc000ffff)==1){ //有键按下 L2_[M'  
   switch(wParam) EdTL]Xk  
   { olr-oi`4C  
    case VK_MENU: Mp=T;Nz  
     MaskBits|=ALTBIT; |!/+ T^u  
     break; p]<)6sZ  
    case VK_CONTROL: T]/5aA4  
     MaskBits|=CTRLBIT; O hRf&5u$  
     break; n^b CrvD  
    case VK_SHIFT: \RtFF  
     MaskBits|=SHIFTBIT; V(:wYk?ZR  
     break; >?_}NZ,y  
    default: //judge the key and send message y^[t3XA6Q  
     break; fwmXIpteK  
   } o5sw]R5  
   for(int index=0;index<MAX_KEY;index++){ .R#-u/6g(  
    if(hCallWnd[index]==NULL) U#bmMH  
     continue; Ya> AI.!K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [qxU \OSC  
    { Vf.*!`UH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \B:k|Pw6~  
     bProcessed=TRUE; We\i0zUU  
    } jE=m4_Ntn  
   } BsL+9lNue  
  } @!j6y (@  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 8TG|frS  
   for(int index=0;index<MAX_KEY;index++){ UG_ PrZd  
    if(hCallWnd[index]==NULL) h?$J;xn  
     continue; E 0l&d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) x^ `IZ{!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); !* KQ2#e  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Jw#7b[a  
   } ,0ilNi>  
  } &5.J y2hO]  
 } Jt #HbAY  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +0j{$MPZ  
} Zy.A9 Bh~  
h_\( $"  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: CBNt _y  
mIp> ~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~:PM_o*6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); oO`a{n-  
4)>UTMF  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: %O f w"W  
.t8hTlV?<B  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /I1n${{5  
{ 'rS\9T   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) zb4{nzX=  
 { j%D{z5,nKm  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 iq?T&44&  
  SaveBmp(); ~wF3$H.@;  
  return FALSE; +> d;%K  
 } [b&V^41W  
 …… //其它处理及默认处理 4mKH |\g  
} SSTn |  
*M*WjEOA  
xWqV~NnE  
  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。 :475FPy]  
<}h <By)  
  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。 tN_=&|{WE4  
tIV{uVM[|D  
  二、编程步骤 =tY%`e  
$Ff6nc=  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; T31F8K3x  
a7uL {*ZR  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; jIwN,H1$-  
){z#Y#]dP  
  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; tw =A] a*  
k.2GIc:5  
  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; 9;uH}j8sE  
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  5、 添加代码,编译运行程序。 m #G,m  
UjLq[,_!  
三、程序代码 BOR$R}q  
g kV`ZT9  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL [s\8@5?E  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) #_`p 0wY  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ^$C&{%  
#if _MSC_VER > 1000 :VWN/m  
#pragma once |(TEG.<g  
#endif // _MSC_VER > 1000 Y2'HP)tfIw  
#ifndef __AFXWIN_H__ rBU)@IpDG  
#error include 'stdafx.h' before including this file for PCH .qKfhHJ  
#endif o8H\l\(  
#include "resource.h" // main symbols M(:bM1AD`u  
class CHookApp : public CWinApp 9Iq<*\V 4  
{ +'iqGg-  
 public: $aB`A$'hK  
  CHookApp(); oM^vJ3  
  // Overrides Q4*{+$A  
  // ClassWizard generated virtual function overrides &/2+'wCp5  
  //{{AFX_VIRTUAL(CHookApp) "L`BuAB  
 public: {O).!  
  virtual BOOL InitInstance(); !fd>wvJ,:  
  virtual int ExitInstance(); 0VNpd~G$  
  //}}AFX_VIRTUAL gR gB= C{  
  //{{AFX_MSG(CHookApp) D5({&.X[-  
  // NOTE - the ClassWizard will add and remove member functions here. 8z7eL>)  
  // DO NOT EDIT what you see in these blocks of generated code ! Gd`7Tf)'  
  //}}AFX_MSG *GY8#Az  
  DECLARE_MESSAGE_MAP() 5Ma."?rW   
}; o0F,!}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); [`s.fkb8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1*$6u5.=F  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :is2 &-|x  
BOOL InitHotkey(); |uz\XK  
BOOL UnInit(); ` ~^My~f  
#endif J%B/(v`  
V@s93kh  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ,)!%^ ~v  
#include "stdafx.h" ntB#2S  
#include "hook.h" ,quUGS  
#include <windowsx.h> BFP@Yn~k  
#ifdef _DEBUG {oF;ZM'r  
#define new DEBUG_NEW Vr"'O6  
#undef THIS_FILE ^+-]V9?+  
static char THIS_FILE[] = __FILE__; [{#T N  
#endif %C #Ps   
#define MAX_KEY 100 #`= >Mza  
#define CTRLBIT 0x04 6/Yo0D>M$  
#define ALTBIT 0x02 \ZhkOl  
#define SHIFTBIT 0x01 $Q}L*4?]  
#pragma data_seg("shareddata") p,|)qr:M  
HHOOK hHook =NULL; R/fE@d2~In  
UINT nHookCount =0; u rQvJ  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ]Ol w6W?%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT tJQZRZViu  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey jk_yrbLc  
static int KeyCount =0; [`E_/95  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift [Mc Hl1a  
#pragma data_seg() H^`J(J+  
HINSTANCE hins; ])bgUH  
void VerifyWindow(); #Tag"b`  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) f\=,_AQ  
//{{AFX_MSG_MAP(CHookApp) ZAeJTCCk  
// NOTE - the ClassWizard will add and remove mapping macros here. ]9'F<T= $_  
// DO NOT EDIT what you see in these blocks of generated code! v0(}"0  
//}}AFX_MSG_MAP VKu_ l  
END_MESSAGE_MAP() <0hVDk~  
K4E2W9h  
CHookApp::CHookApp() #lSGH 5Fp?  
{ >ifys)wg>  
 // TODO: add construction code here, zVe,HKF/  
 // Place all significant initialization in InitInstance "}%j'  
} #nft{AN  
-kP2Brm  
CHookApp theApp; 9-&@Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) TNeL%s?B3  
{ @"98u$5  
 BOOL bProcessed=FALSE; C~K/yLCAi  
 if(HC_ACTION==nCode) qK@,O \  
 { y?3u6q++  
  if((lParam&0xc0000000)==0xc0000000){// Key up `('Up?  
   switch(wParam) EG &me  
   { W>?aZv  
    case VK_MENU: g2}aEfp!H  
     MaskBits&=~ALTBIT; v;g,qO!LJ  
     break; qz Hsqlof  
    case VK_CONTROL: J8@+)hn  
     MaskBits&=~CTRLBIT; `:m=rT_  
     break; QkTU@T6>o  
    case VK_SHIFT: [I'q"yRu]i  
     MaskBits&=~SHIFTBIT; 1|G5 W:  
     break; z Z~t ,>  
    default: //judge the key and send message l ObY  
     break; H15!QxD#  
   } &`>dY /Y  
   for(int index=0;index<MAX_KEY;index++){ p<Tg}fg  
    if(hCallWnd[index]==NULL) GMLx$?=j  
     continue; yDe*-N\'W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L"?4}U:  
    { L8zMzm=-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); x 2l}$(7  
     bProcessed=TRUE; N>P" $  
    } f4dHOH  
   } prIJjy-F  
  } Oq3t-omXS  
  else if((lParam&0xc000ffff)==1){ //Key down !^1oH**  
   switch(wParam) @^-f +o  
   { }095U(@  
    case VK_MENU: ov\%*z2=  
     MaskBits|=ALTBIT; 673G6Nk  
     break; i1b3>H*3  
    case VK_CONTROL: ,y/m5-D!  
     MaskBits|=CTRLBIT; &@2`_%QtA  
     break; @Y(7n/*  
    case VK_SHIFT: _$HCNFdh  
     MaskBits|=SHIFTBIT; xs "\c7pC  
     break; G&M)n*o  
    default: //judge the key and send message >%_i#|dE>  
     break; ]i `~J  
   } ,s@S`KS0  
   for(int index=0;index<MAX_KEY;index++) chE}`I?  
   { P;&U3i  
    if(hCallWnd[index]==NULL) NX]6RZr-  
     continue; (15.?9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F:0 E- z'  
    { (~b0-3s  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); jt9@aN.mJN  
     bProcessed=TRUE; C8:y+pH_U;  
    } )^E6VD&6  
   } %6@m~;c0  
  } pf=CP%L  
  if(!bProcessed){ {gDoktC@M  
   for(int index=0;index<MAX_KEY;index++){ w %6 L"  
    if(hCallWnd[index]==NULL) Fy_~~nI0  
     continue; ??P3gA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) sP8_Y,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  |FFM Q"  
   } RT9%E/m  
  } j2n 4; m  
 } 3}.OSt'=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !#WJ(zSq  
} X%B2xQM 5  
=A"z.KfV  
BOOL InitHotkey() jwwst\f  
{ eN<?rVZl  
 if(hHook!=NULL){ Mt12 1Q&"  
  nHookCount++; oT}Sh4Wt.  
  return TRUE; cavzXz  
 } 4&`d$K  
 else {?IUf~<  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); bGB5]%v,  
  if(hHook!=NULL) zn\$6'"  
   nHookCount++; ).$kp2IN  
  return (hHook!=NULL); 2QIo|$  
} VZA>ErB  
BOOL UnInit() FvBnmYn W  
{ %-NG eN8  
 if(nHookCount>1){ <bBgevL+_K  
  nHookCount--; GIUyW  
  return TRUE; !t&C,@Ox  
 } u$x'P <b  
 BOOL unhooked = UnhookWindowsHookEx(hHook); o-]8)G>~M  
 if(unhooked==TRUE){ o1<Z; 2#  
  nHookCount=0; Xkp`1UTH  
  hHook=NULL; \Q,5Ne'o  
 } *eUxarI  
 return unhooked; "LVN:|!  
} +n<;);h  
45Q#6Bt E  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2|8$@*-\  
{ k jR-p=}  
 BOOL bAdded=FALSE; hB]<li)"C  
 for(int index=0;index<MAX_KEY;index++){ Ng1[y4R}  
  if(hCallWnd[index]==0){ X.ZY1vO  
   hCallWnd[index]=hWnd; Z3A"GWY  
   HotKey[index]=cKey; 2fdC @V  
   HotKeyMask[index]=cMask; 0a v2w5>af  
   bAdded=TRUE; z8w@pT  
   KeyCount++; 7!8R)m^1[  
   break; xa%2w]  
  } J)=Ts({  
 } x[YW 3nF  
 return bAdded; ,V=]QHcg  
}  OV$|!n  
]B-3Lh  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \MmKz^tO  
{ p!cNn7{;  
 BOOL bRemoved=FALSE; TbhsOf!  
 for(int index=0;index<MAX_KEY;index++){ to'O;f">n  
  if(hCallWnd[index]==hWnd){ D?? \H\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ CK} _xq2b  
    hCallWnd[index]=NULL; ",Fqpu&M  
    HotKey[index]=0; |f"1I4K g  
    HotKeyMask[index]=0; xy<)zKp  
    bRemoved=TRUE; \F),SL  
    KeyCount--; _ ~E_#cNn  
    break; 0Y ld!L  
   } (k5d.E]CK  
  } 3VmF1w 2  
 } 1?ST*b  
 return bRemoved; DUu~s,A  
} I~U;M+n*y  
14rX:z  
void VerifyWindow() [c#?@S_  
{ 5!^?H"#c  
 for(int i=0;i<MAX_KEY;i++){ VWE`wan<  
  if(hCallWnd!=NULL){ Ezw<  
   if(!IsWindow(hCallWnd)){ Zk 9i}H  
    hCallWnd=NULL; x?-kt.M  
    HotKey=0; .&c!k1kH  
    HotKeyMask=0; ~-2q3U Py  
    KeyCount--; -D,kL  
   } JAcNjzL  
  } W q>qso  
 } -VRKQNT  
} $t42?Z=N&z  
eop7=!`-~~  
BOOL CHookApp::InitInstance() C2Af$7c  
{ 6ALUd^  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); AG<TY<nqL  
 hins=AfxGetInstanceHandle(); W!WeYV}kb  
 InitHotkey(); 1jQlwT(:  
 return CWinApp::InitInstance(); eWAgYe2  
} BZWGXzOFh  
:jioF{,  
int CHookApp::ExitInstance() AoN |&o  
{ a'A'%+2  
 VerifyWindow(); $ &fm^1  
 UnInit(); dRnO5 7+{  
 return CWinApp::ExitInstance(); T6p2=o&p  
} sBm/9vu  
#_[W*-|L  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file wDS(zG   
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ( G#W6  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^6I8a"  
#if _MSC_VER > 1000 Q?TXM1Bp  
#pragma once c,RY j  
#endif // _MSC_VER > 1000 cu$i8$?t   
$79-)4;z4  
class CCaptureDlg : public CDialog t:.ZvA3  
{ Z }Z]["q  
 // Construction *f( e`3E  
 public: }=JuC+#~n  
  BOOL bTray; 05Go*QvV  
  BOOL bRegistered; rA#Ji~  
  BOOL RegisterHotkey(); K+J fU J  
  UCHAR cKey; ~ 'L`RJR  
  UCHAR cMask; E'4 dI:  
  void DeleteIcon(); :\8&Th}Se  
  void AddIcon(); $ACD6u6  
  UINT nCount; 8ORr  
  void SaveBmp(); 5Dlx]_  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor aXO|% qX  
  // Dialog Data /0I=?+QSo  
  //{{AFX_DATA(CCaptureDlg) ~`Xu 6+1o  
  enum { IDD = IDD_CAPTURE_DIALOG }; xKC{P{:  
  CComboBox m_Key; @Tg +Kt  
  BOOL m_bControl; eMV@er|  
  BOOL m_bAlt; 8 |iMD1  
  BOOL m_bShift; tM;S )S(=  
  CString m_Path; P_3U4J  
  CString m_Number; G`r*)pdm  
  //}}AFX_DATA QHuh=7u)  
  // ClassWizard generated virtual function overrides )!(etB=`y  
  //{{AFX_VIRTUAL(CCaptureDlg) JqmKD4p  
 public: /Jci1o  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 9 ]W4o"  
 protected: w_eUU)z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "sU  ~|  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [ O"8Tzr  
  //}}AFX_VIRTUAL `OmYz{*r  
  // Implementation L=WB'*N  
 protected: 4\%XC F!  
  HICON m_hIcon; mrz@Y0mgL  
  // Generated message map functions ngHPOI16  
  //{{AFX_MSG(CCaptureDlg) LQrm/)4bF5  
  virtual BOOL OnInitDialog(); Ghpk0ia%d  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); eEG]JH  
  afx_msg void OnPaint(); gELb(Y\ak  
  afx_msg HCURSOR OnQueryDragIcon(); Jz6,2,LN  
  virtual void OnCancel(); '}q1 F<&  
  afx_msg void OnAbout(); %/x%hs;d  
  afx_msg void OnBrowse(); FI$#x%A  
  afx_msg void OnChange(); jB-)/8.qk  
 //}}AFX_MSG CD+2 w cy  
 DECLARE_MESSAGE_MAP() +B0G[k7  
}; v/B:n   
#endif rv?d3QqIC  
~NtAr1  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file qxe%RYdA'j  
#include "stdafx.h" 8^Ov.$rP  
#include "Capture.h" j,/t<@S>  
#include "CaptureDlg.h" `F<[\@\d5  
#include <windowsx.h> B =`"!?we  
#pragma comment(lib,"hook.lib") E@F:U*A6%  
#ifdef _DEBUG gwepaW  
#define new DEBUG_NEW eZWR)+aq  
#undef THIS_FILE @j Y_^8#S  
static char THIS_FILE[] = __FILE__; W^^}-9  
#endif WaRYrTDv64  
#define IDM_SHELL WM_USER+1 1"82JN|!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); M%NapK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); GI:$(<  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; *jF VYg  
class CAboutDlg : public CDialog *t+E8)qL  
{ CxOBH89(  
 public: HBFuA.",  
  CAboutDlg(); 0w_2E  
  // Dialog Data _~ipO1*  
  //{{AFX_DATA(CAboutDlg) U@$=0*  
  enum { IDD = IDD_ABOUTBOX }; I2wT]L UV  
  //}}AFX_DATA >%D=#}8l@  
  // ClassWizard generated virtual function overrides _Vq7Gxy$R  
  //{{AFX_VIRTUAL(CAboutDlg) ~?c}=XL-  
 protected: wCb%{iowH  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support p3NTI/-  
  //}}AFX_VIRTUAL -)Y?1w  
  // Implementation %Jpb&CEY  
 protected: =!`\=!y  
  //{{AFX_MSG(CAboutDlg) 6/#5TdJA  
  //}}AFX_MSG mJ%r2$/*  
  DECLARE_MESSAGE_MAP() ]3E':JM@  
}; [n_H9$   
plY`lqm  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) *0^t;A+  
{ '*KP{"3\  
 //{{AFX_DATA_INIT(CAboutDlg) DjT ekn  
 //}}AFX_DATA_INIT M\s^>7es  
} :-f"+v  
'7<@(HO  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ,Wp0,>!  
{ !\NKu1ta  
 CDialog::DoDataExchange(pDX); M]>JI'8  
 //{{AFX_DATA_MAP(CAboutDlg) N -]m <z>  
 //}}AFX_DATA_MAP cg,_nG]i  
} }<wj~f([  
R<!WW9IM  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) B9_0 Yq  
 //{{AFX_MSG_MAP(CAboutDlg) JAA P5ur  
 // No message handlers _]=`F l  
 //}}AFX_MSG_MAP i`g>Y5   
END_MESSAGE_MAP() N[$(y} !s  
rr[9sk`^H  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) rwxJR@Ttn  
: CDialog(CCaptureDlg::IDD, pParent) fuH Dif,  
{ XKsG2>l-W  
 //{{AFX_DATA_INIT(CCaptureDlg) V#TA%>  
  m_bControl = FALSE; ]'aG oR  
  m_bAlt = FALSE; -BV&u(  
  m_bShift = FALSE; g(:y_EpmLH  
  m_Path = _T("c:\\"); B%Yb+M&K  
  m_Number = _T("0 picture captured."); a<V=C  
  nCount=0; V,uhBMT#  
  bRegistered=FALSE; A&5$eGe9  
  bTray=FALSE; rrSA.J{  
 //}}AFX_DATA_INIT r,6~?hG]  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ^3`98y.Q  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); s 8``U~D   
} is}Fy>9i  
na FZ<'t>&  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Q9[dUdQm  
{ U[S;5xeF.j  
 CDialog::DoDataExchange(pDX); ^;YD3EZw  
 //{{AFX_DATA_MAP(CCaptureDlg) i[ BR"(  
  DDX_Control(pDX, IDC_KEY, m_Key); 2|~& x~  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ?<  w +{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); >t8eVMMa  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); r/Pg,si  
  DDX_Text(pDX, IDC_PATH, m_Path); +V |]:{3W  
  DDX_Text(pDX, IDC_NUMBER, m_Number); /$rS0@p  
 //}}AFX_DATA_MAP @fpxGMy&  
} "`:#sF9S  
qc\o>$-:`  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) }7$\F!R  
//{{AFX_MSG_MAP(CCaptureDlg) !*%3um  
 ON_WM_SYSCOMMAND() !9o8v0ZI  
 ON_WM_PAINT() )K2n!Fbd  
 ON_WM_QUERYDRAGICON() NUL~zb  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) hJ:Hv.{`)W  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) p,D/ Pb8  
 ON_BN_CLICKED(ID_CHANGE, OnChange) yB. 6U56  
//}}AFX_MSG_MAP McnP>n  
END_MESSAGE_MAP() *OF7 {^~&  
`T9<}&=!  
BOOL CCaptureDlg::OnInitDialog() q#\eL~k  
{ WaMn[/{  
 CDialog::OnInitDialog(); +N4h Q"  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9Zrn(D  
 ASSERT(IDM_ABOUTBOX < 0xF000); ((dG<  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .^kTb2$X  
 if (pSysMenu != NULL) l:@.D|(o3  
 { I )B2Z(<Q  
  CString strAboutMenu; m Xw1%w[*  
  strAboutMenu.LoadString(IDS_ABOUTBOX); !9)*.9[8  
  if (!strAboutMenu.IsEmpty()) dy`~%lX?  
  { 1xtbhk]D  
   pSysMenu->AppendMenu(MF_SEPARATOR); Vxgc|E^J  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ^U_jeAuk8[  
  } kLD)<D  
 } ;pB?8Z  
 SetIcon(m_hIcon, TRUE); // Set big icon R4qk/@]t  
 SetIcon(m_hIcon, FALSE); // Set small icon DTIy/  
 m_Key.SetCurSel(0); m d C. FO-  
 RegisterHotkey(); t%dPj8~  
 CMenu* pMenu=GetSystemMenu(FALSE); cRg$~rYd  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); nj9hRiL n  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); {{DW P-v4  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); kD; BwU[  
 return TRUE; // return TRUE unless you set the focus to a control ]c5GG!E-g  
} orU4{.e  
1g/mzC   
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) qbAoab53  
{ alu`T c~  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) /|DQ_<*  
 { <g%xo"  
  CAboutDlg dlgAbout; ;%82Z4  
  dlgAbout.DoModal(); d#z67Nl6  
 } "{0kg'fU  
 else 3 S5QqAm  
 { TOuFFR  
  CDialog::OnSysCommand(nID, lParam); =C:0 ='a  
 } R\+$^G}#6  
} q{_buTARq  
/cjf 1Dc  
void CCaptureDlg::OnPaint() H+0 *  
{ Aqm0|GlJ  
 if (IsIconic()) L"b5P2{c  
 { ?4~lA L1  
  CPaintDC dc(this); // device context for painting QnGJ4F  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); }M~AkJL  
  // Center icon in client rectangle (?3( =+t  
  int cxIcon = GetSystemMetrics(SM_CXICON); ?NwFpSB2  
  int cyIcon = GetSystemMetrics(SM_CYICON); r-V./M@L  
  CRect rect; l;;:3:  
  GetClientRect(&rect); W.CIyGK  
  int x = (rect.Width() - cxIcon + 1) / 2; >3Y&jsh<  
  int y = (rect.Height() - cyIcon + 1) / 2; 1IsR}uLh  
  // Draw the icon FQ4rA 4  
  dc.DrawIcon(x, y, m_hIcon); 0+H"$2/  
 } {l1;&y?  
 else hmi15VW  
 { [j/-(?+  
  CDialog::OnPaint(); (nzzX?`nY  
 } D6m>>&E['  
} Gce_gZH7{  
G dooy~cn  
HCURSOR CCaptureDlg::OnQueryDragIcon() AUq?<Vg\  
{ /;>EyWW  
 return (HCURSOR) m_hIcon;  6$Dbeb  
} #QB`'2)vw  
Ar$LA"vu4  
void CCaptureDlg::OnCancel() P"#^i<ut@T  
{ >]`x~cE.5  
 if(bTray) OL=bhZ  
  DeleteIcon(); 9!OpW:bR|  
  CDialog::OnCancel(); KG?]MVXA  
} &KB{,:)?  
U9q*zP_jV  
void CCaptureDlg::OnAbout() c*W$wr  
{ 5u8Sxfm",  
 CAboutDlg dlg; }qg!Um0  
 dlg.DoModal(); ["7}u^z@<+  
} 93rE5eGs  
8;5/_BwMu  
void CCaptureDlg::OnBrowse() {F4:  
{ g$97"d'  
 CString str; n-Xj>  
 BROWSEINFO bi; (+@.L7>m+t  
 char name[MAX_PATH]; TvP# /qGgG  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); )2A4vU-IR.  
 bi.hwndOwner=GetSafeHwnd(); oa4}GNH  
 bi.pszDisplayName=name; kDKpuA!  
 bi.lpszTitle="Select folder"; v 7R&9kU{  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; I@B7uFj  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); v$cD!`+k  
 if(idl==NULL) ;Cy@TzO/|  
  return; 3m^BYr*y^  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 'ZDclz9}  
 str.ReleaseBuffer(); _`\INZe-G  
 m_Path=str; izxCbbg  
 if(str.GetAt(str.GetLength()-1)!='\\') I5~DC  
  m_Path+="\\"; o?3R HP47  
 UpdateData(FALSE); QJ /SP  
} #.@=xhK/  
o6r4tpiR5  
void CCaptureDlg::SaveBmp() `#]\Wnp~y  
{ )0Lq>6j9  
 CDC dc; 2Ar<(v$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); zaZnL7ZJX  
 CBitmap bm; RD4)NN6y5}  
 int Width=GetSystemMetrics(SM_CXSCREEN); :U 9R 1^}A  
 int Height=GetSystemMetrics(SM_CYSCREEN); 9NT;^K^ I  
 bm.CreateCompatibleBitmap(&dc,Width,Height); i_MI!o  
 CDC tdc; \x!>5Z Y  
 tdc.CreateCompatibleDC(&dc); LWI~m2  
 CBitmap*pOld=tdc.SelectObject(&bm); @FTi*$Ix  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY);  /F_ :@#H  
 tdc.SelectObject(pOld); JVkawkeX  
 BITMAP btm; sa`Yan  
 bm.GetBitmap(&btm); S|[UEU3FpB  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; GXfVjC31z  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); qkIU>b,B  
 BITMAPINFOHEADER bih; H@zk8]_P  
 bih.biBitCount=btm.bmBitsPixel; _x!pM j(A  
 bih.biClrImportant=0; w#e'K-=  
 bih.biClrUsed=0; /\#5\dHj  
 bih.biCompression=0; 8syo_sC |  
 bih.biHeight=btm.bmHeight; @K9T )p]  
 bih.biPlanes=1; No7Q,p  
 bih.biSize=sizeof(BITMAPINFOHEADER); Y[!a82MTzn  
 bih.biSizeImage=size; ]Q3Gj@6  
 bih.biWidth=btm.bmWidth; 8VZ-`?p  
 bih.biXPelsPerMeter=0; 3\{Sf /#  
 bih.biYPelsPerMeter=0; ,B2 -'O  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); zgqw*)C~  
 static int filecount=0; P5>CSWy%  
 CString name; TI>yi ^}  
 name.Format("pict%04d.bmp",filecount++); tX251S  
 name=m_Path+name; @>Keu\)  
 BITMAPFILEHEADER bfh; x}{VHp`|ld  
 bfh.bfReserved1=bfh.bfReserved2=0; }]I?vyQ#V  
 bfh.bfType=((WORD)('M'<< 8)|'B'); $<v_Vm?6d  
 bfh.bfSize=54+size; K288&D|1WU  
 bfh.bfOffBits=54; :~(im_r  
 CFile bf; !A!\S/x4  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ R%%`wmG)"  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); h uJqqC  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); q}5A^QX  
  bf.WriteHuge(lpData,size); R*X2Z{n  
  bf.Close(); mw[4<vfB0a  
  nCount++; V5B-S.i@  
 } {Fi@|'  
 GlobalFreePtr(lpData); :j ~5(K"  
 if(nCount==1) 7mM;Q  
  m_Number.Format("%d picture captured.",nCount); O[ !o1.  
 else %U GlAyj  
  m_Number.Format("%d pictures captured.",nCount); vNC0M:p,  
  UpdateData(FALSE); ]D%k)<YK  
} N-gRfra+8L  
6<Z: Xw  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) [fp"MPP3  
{ blcKtrYg  
 if(pMsg -> message == WM_KEYDOWN) vgj^-  
 { lQBM0|n  
  if(pMsg -> wParam == VK_ESCAPE) 5-^%\?,x  
   return TRUE; 8-:k@W  
  if(pMsg -> wParam == VK_RETURN) zc+;VtP|8  
   return TRUE; >A&@Wp1  
 } F-^HN%  
 return CDialog::PreTranslateMessage(pMsg); `VtwKt*  
} <+gl"lG  
` a>vPW  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) l,.?-|Poa  
{ h '[vB^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ]ufW61W6Ci  
  SaveBmp(); bSf(DSqx  
  return FALSE; Zjg\jo  
} "ILWIzf.]  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @@IA35'tc  
 CMenu pop; |L;psK  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); \'Ta8  
 CMenu*pMenu=pop.GetSubMenu(0); zU~..;C  
 pMenu->SetDefaultItem(ID_EXITICON); Z~c'h  
 CPoint pt; M"^Vf{X^  
 GetCursorPos(&pt); 5vf t}f  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); @@83PJFid  
 if(id==ID_EXITICON) xXZKj  
  DeleteIcon(); pFTlhj)1  
 else if(id==ID_EXIT) n=? 0g;1!  
  OnCancel(); P]"d eB|  
 return FALSE; P/Kit?kngS  
} hFMst%:y$  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); V:BX"$ J1  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ulf/C%t,R  
 AddIcon(); <z uE=0P~%  
 return res; ex \W]5  
} H@E" )@92  
_}OJPahw  
void CCaptureDlg::AddIcon() GQ2PmnV +  
{ @b\ S.  
 NOTIFYICONDATA data; .vS6_  
 data.cbSize=sizeof(NOTIFYICONDATA); 1?|6odc  
 CString tip; *Ca)RgM  
 tip.LoadString(IDS_ICONTIP); JA(fam~{  
 data.hIcon=GetIcon(0); RX5.bVp eE  
 data.hWnd=GetSafeHwnd(); kLt9; <L  
 strcpy(data.szTip,tip); ;#s}b1  
 data.uCallbackMessage=IDM_SHELL; S9R]Zl7{-  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; k0_$M{@Y  
 data.uID=98; qQOD  
 Shell_NotifyIcon(NIM_ADD,&data); _1<'"u#6w  
 ShowWindow(SW_HIDE); tRnW%F5  
 bTray=TRUE; {Y91vXTz7  
} 6@q[tN7_^  
oL'1Gm@X?  
void CCaptureDlg::DeleteIcon() .3<IOtD=  
{ Jh4&Qh|t  
 NOTIFYICONDATA data; 3;MjO*-  
 data.cbSize=sizeof(NOTIFYICONDATA); 0^_lj9B!  
 data.hWnd=GetSafeHwnd(); V.ji _vX  
 data.uID=98; ] 5v4^mk  
 Shell_NotifyIcon(NIM_DELETE,&data); qmA2bw]  
 ShowWindow(SW_SHOW); oL Vtu5  
 SetForegroundWindow(); qzA]2'~Q  
 ShowWindow(SW_SHOWNORMAL); 0sDwTb"  
 bTray=FALSE; BwJ^_:(p~  
} b/B`&CIA0"  
Y^2Qxo3"3  
void CCaptureDlg::OnChange() RO{@RhnV  
{ iv:/g|MBI&  
 RegisterHotkey(); /J.\p/%\  
} 6lmiMU&V  
q^1aPz  
BOOL CCaptureDlg::RegisterHotkey() $tCcjBK\  
{ {^2W>^  
 UpdateData(); f{Fe+iPc  
 UCHAR mask=0; 'B (eMnLg  
 UCHAR key=0; MJ*]fC3/  
 if(m_bControl) ?96-" l  
  mask|=4; oU0 h3  
 if(m_bAlt) 6I>5~?#  
  mask|=2; a-5HIY5  
 if(m_bShift) Mf:M3H%YV+  
  mask|=1; BKQIo)g.G  
  key=Key_Table[m_Key.GetCurSel()]; /Y[o=Uyl  
 if(bRegistered){ -nk#d%a\  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); TcD[Teu  
  bRegistered=FALSE; FU\/JF.j  
 } )!k_Gb`#X  
 cMask=mask; 8 b  8\  
 cKey=key; 0^9:KZ.!  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); }B"|z'u  
 return bRegistered; lMwk.#  
} [.;%\>Qk<  
Kr/h`RM  
  四、小结 N(:nF5>_  
4e@&QOo`Cu  
  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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