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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: 19.!$;  
  [pyXX>:M  
  一、实现方法 Ij,?G*  
,_7tRkn  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: r+WPQ`Ar  
[zO(V`S2  
#pragma data_seg("shareddata") <\#  
HHOOK hHook =NULL; //钩子句柄 -_H2FlB  
UINT nHookCount =0; //挂接的程序数目 ?R~Ye  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 1\9BO:<K  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 {:q9:  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey #'{PY r  
static int KeyCount =0; " kJWWR  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 `5aypJf 1  
#pragma data_seg() P#'DGW&W0  
\6PIw-)  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 g\mrRZ/?  
E`LIENm  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 1=cfk#  
& ;x1Rx  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR &|,qsDK(  
cKey,UCHAR cMask) OEqe^``!  
{ 4~J1pcBno%  
 BOOL bAdded=FALSE; 4pHPf<6  
 for(int index=0;index<MAX_KEY;index++){ k?*DBXJv  
  if(hCallWnd[index]==0){ =u1w\>(2Y  
   hCallWnd[index]=hWnd; ri_6 wbPp  
   HotKey[index]=cKey; `oI/;&  
   HotKeyMask[index]=cMask; ~+NFWNgN  
   bAdded=TRUE; \|4MU"ri  
   KeyCount++; J}`$WL:  
   break; Q $,kB<M  
  } OCoRcrAx  
 } 0}3'h#33=  
 return bAdded; hdWp  
} g 0_r  
//删除热键 \< +47+  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) pHbguoH,  
{ 3lEU$)QA3  
 BOOL bRemoved=FALSE; Gt *<?  
 for(int index=0;index<MAX_KEY;index++){ ,'0oj$~S:  
  if(hCallWnd[index]==hWnd){ F1]PYx$X  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ${H&Q*  
    hCallWnd[index]=NULL; (~yJce  
    HotKey[index]=0; J ##X5'a3*  
    HotKeyMask[index]=0; 'S-"*:$,u  
    bRemoved=TRUE; }qX&*DU_@  
    KeyCount--; 74N\G1  
    break; Bwvc@(3v  
   } [Z&s0f1Qb  
  } |gxB; GG  
 } kj"_Y"q=  
 return bRemoved; vnOF$6n  
} rMFf8D(Y  
79fyn!Iz<  
BY2txLLB  
  DLL中的钩子函数如下: %3B>1h9N  
.0/Z'.c 8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) E;e2{@SX2K  
{ PX{~!j%n  
 BOOL bProcessed=FALSE; oN}j<6s  
 if(HC_ACTION==nCode) Q`fA)6U  
 { Bc ,z]  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 dD2e"OIX  
   switch(wParam) dK`O,[}  
   {  w)c#ZJHG  
    case VK_MENU: K>~cY%3^i  
     MaskBits&=~ALTBIT; &(1NOyX&  
     break; G U/k^ Qy  
    case VK_CONTROL: NjMLq|X  
     MaskBits&=~CTRLBIT; ATkqzE`;  
     break; #6Ph"\G/  
    case VK_SHIFT: 2PW3 S{Dt  
     MaskBits&=~SHIFTBIT; .aRxqFi_  
     break; 1;9E*=  
    default: //judge the key and send message |?b"my$g$  
     break; s+t eYL#Zi  
   } U.9nHo{  
   for(int index=0;index<MAX_KEY;index++){ ~a|Q[tiV]  
    if(hCallWnd[index]==NULL) !a&F:Fbm  
     continue; GM92yi!8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~}l,H:jk@  
    { `I:,[3_/   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); +004 2Yi  
     bProcessed=TRUE; n8ya$bc  
    } Q&\ksM  
   } /]>{"sS(  
  } I>zn$d*0  
  else if((lParam&0xc000ffff)==1){ //有键按下 h^X.e[  
   switch(wParam) l3$?eGGM  
   { U?C{.@#w  
    case VK_MENU: O/"&?)[v  
     MaskBits|=ALTBIT; 7im;b15j`'  
     break; FAGVpO[  
    case VK_CONTROL: U9OF0=g  
     MaskBits|=CTRLBIT; aM1JG$+7G  
     break; cHd39H9  
    case VK_SHIFT: wB GxJ\+M  
     MaskBits|=SHIFTBIT; u _^=]K;  
     break; N%i<DsK.u6  
    default: //judge the key and send message 9~ af\G  
     break; {u][q &n  
   } bHG>SW\]`?  
   for(int index=0;index<MAX_KEY;index++){ I[Y?f8gJ  
    if(hCallWnd[index]==NULL) ? +!?$h  
     continue; >b${rgCvQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tq93 2M4  
    { M_uij$1-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #&gy@!a~  
     bProcessed=TRUE; t:n|0G(  
    } OOwJ3I >]>  
   } q+Q)IVaU81  
  } ,g.=vQm:?  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Q:=/d$*xd  
   for(int index=0;index<MAX_KEY;index++){ t`{Fnf  
    if(hCallWnd[index]==NULL) hidweg*7  
     continue; t0(hc7`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ,5WDYk-  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <:o><f+  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 wAPdu y[  
   } );LwWKa  
  } MeS$+9jV(  
 } zvg&o)/[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {S~$\4vC!  
} 2J <Z4Ap  
14zzWzKx  
  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: ShxX[k  
5eJd$}Lbc  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6Z=H>w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6.=b^6MV  
1j(,VW  
  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: exvsf|  
zt6ep=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) aPgG+tu  
{ $Q4b~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) RT9@&5>il  
 { ^)I:82"|?  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 d_hcv|%  
  SaveBmp(); p^!p7B`qe.  
  return FALSE; fba3aId[  
 } *4E,| IJ  
 …… //其它处理及默认处理 vA`.8U 0S  
} QkAwG[4  
64@s|m*  
r8$TT\?~  
  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。 QJ?!_2Ax  
st>t~a|T  
  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。 =uTV\)  
>Fh@:M7z  
  二、编程步骤 }+1oD{  
x.Y,]wis  
  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"; Qa+gtGtJ  
UQ?8dw:E~  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; T~E83Jw  
`}l%Am  
  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; ualtIHXK)  
biD7(AK  
  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; WBIS  
4vphLAm  
  5、 添加代码,编译运行程序。 4{pa`o3  
wr(?L7 $+  
三、程序代码 |Rc#Q<Vh|  
0XNb@ogo  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL &2J|v#$F  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) v;7u"9t  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ <}%*4mv  
#if _MSC_VER > 1000 DFMWgBL  
#pragma once ua-p^X`w  
#endif // _MSC_VER > 1000 y C#{nUdw  
#ifndef __AFXWIN_H__ 511q\w M  
#error include 'stdafx.h' before including this file for PCH QkbN2mFv%  
#endif *yx:nwmo  
#include "resource.h" // main symbols ;iVyJZI  
class CHookApp : public CWinApp Sz&`=x#  
{ cA kw5}P   
 public: P<~ y$B  
  CHookApp(); ikC;N5Sw  
  // Overrides fx},.P=:*  
  // ClassWizard generated virtual function overrides o\N}?Z,Kk  
  //{{AFX_VIRTUAL(CHookApp) Uan ;}X7@  
 public: (ydeZx  
  virtual BOOL InitInstance(); iuEdm:pW  
  virtual int ExitInstance(); ns-x\B?^  
  //}}AFX_VIRTUAL %k_JLddlW  
  //{{AFX_MSG(CHookApp) AyDK-8a  
  // NOTE - the ClassWizard will add and remove member functions here. wpdT "  
  // DO NOT EDIT what you see in these blocks of generated code ! t$J-6dW  
  //}}AFX_MSG <G={V fr  
  DECLARE_MESSAGE_MAP()  ar yr  
}; ak zb<aT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ]3G2mY;`"%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); t@\0$V \X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p5\b&~ g  
BOOL InitHotkey(); l; 4F,iI  
BOOL UnInit(); ?(z3/ "g]  
#endif _kS us  
}PVB+i M  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. P<1zXs.H  
#include "stdafx.h" #R$!|  
#include "hook.h" `Cc<K8s8  
#include <windowsx.h> VQyDd~Za  
#ifdef _DEBUG uB BE!w_  
#define new DEBUG_NEW JG `QJ%  
#undef THIS_FILE PuWF:'w r  
static char THIS_FILE[] = __FILE__; _z;N|Xe  
#endif @4pN4v8U  
#define MAX_KEY 100 .Kx5Kh {  
#define CTRLBIT 0x04 0(n/hJ  
#define ALTBIT 0x02 btOC\bUMfD  
#define SHIFTBIT 0x01 dFlx6H+R!0  
#pragma data_seg("shareddata") YeQX13C"Z  
HHOOK hHook =NULL; d 9|u~3  
UINT nHookCount =0; PF~&!~S>W  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 4D8q Gti  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT d;z`xy(C  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 8mi IlB  
static int KeyCount =0; +q1@,LxN  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift J<2N~$  
#pragma data_seg() ]du pU"VV  
HINSTANCE hins; "-9YvB#  
void VerifyWindow(); .._wTOSq  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) B*{CcQ<5  
//{{AFX_MSG_MAP(CHookApp) KQk;:1hW  
// NOTE - the ClassWizard will add and remove mapping macros here. $ _zdjzT  
// DO NOT EDIT what you see in these blocks of generated code! +#O?sI#  
//}}AFX_MSG_MAP ppxu\a  
END_MESSAGE_MAP() I<$lpU_H  
B}vI<?c  
CHookApp::CHookApp() q8U]Hyp(`  
{ Gh j[nsoC~  
 // TODO: add construction code here, /2c?+04+  
 // Place all significant initialization in InitInstance vR-/c  
} Gc>\L3u  
u+*CpKR}  
CHookApp theApp; o_cj-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5i0<BZDTef  
{ B!:(*lF  
 BOOL bProcessed=FALSE; _M?:N:e  
 if(HC_ACTION==nCode) }Vt5].TA  
 { B|8(}Ciqx  
  if((lParam&0xc0000000)==0xc0000000){// Key up ! !9V0[  
   switch(wParam) R +k\)_F  
   { >o@WT kF]  
    case VK_MENU: h' 16"j>  
     MaskBits&=~ALTBIT; >y1/*)O9~  
     break; wFh{\  
    case VK_CONTROL: ZEB1()GB  
     MaskBits&=~CTRLBIT; IgVxWh#  
     break; ^OUkFH;dG?  
    case VK_SHIFT: V r y#  
     MaskBits&=~SHIFTBIT;  `=oN&!  
     break; R{.ku!w  
    default: //judge the key and send message r8mE   
     break; [hs{{II  
   } bygwoZ<E  
   for(int index=0;index<MAX_KEY;index++){ "UE'd Wz  
    if(hCallWnd[index]==NULL) UXd\Q''  
     continue; pJ{sBp_$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zU(U^  
    { IE3GM^7\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^CX~>j\(  
     bProcessed=TRUE; J=() A+  
    } c| E  
   } k1X<jC]P  
  } ) +{'p0  
  else if((lParam&0xc000ffff)==1){ //Key down C; ! )<(Vw  
   switch(wParam) |XeuqZa  
   { zdr?1=  
    case VK_MENU: ifuVVFov  
     MaskBits|=ALTBIT; 8Y:bvs.j  
     break; C6GYhG]  
    case VK_CONTROL: !x>P]j7A}Y  
     MaskBits|=CTRLBIT;  +&|WC2#  
     break; zF{5!b  
    case VK_SHIFT: srUpG&Bcx  
     MaskBits|=SHIFTBIT; K{ N#^L!  
     break; KnlVZn[3t  
    default: //judge the key and send message /<GygRs  
     break; qUCiB}  
   } " 4s,a  
   for(int index=0;index<MAX_KEY;index++) oSxHTbp?  
   { _,5(HETE2  
    if(hCallWnd[index]==NULL) p 3X>  
     continue; #\w~(Nm-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Rf7py)  
    { DI+kO(S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -B R&b2  
     bProcessed=TRUE; *K!V$8k=99  
    } Q&yfl  
   } QGfU:  
  } 'H+pwp"M@  
  if(!bProcessed){ fY\QI =  
   for(int index=0;index<MAX_KEY;index++){ _uL m!ku  
    if(hCallWnd[index]==NULL) Uc \\..Cf  
     continue; 2uz<n}IV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) yt$V<8a  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); UA}k"uM  
   } R(3V ! ph  
  } K5b8lc  
 } %T!UEl`v  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); jh9^5"vQ  
} JIDE]f  
+.{_n(kU  
BOOL InitHotkey() Z|E( !"zE9  
{ Ip|7JL0Z  
 if(hHook!=NULL){ !qT.D:!@zF  
  nHookCount++; H+F'K XP*K  
  return TRUE; B2VUH..am  
 } IeE+h-3p  
 else eo"6 \3z  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 0/;T\9  
  if(hHook!=NULL) .hnGHX  
   nHookCount++; DqbN=[!X~n  
  return (hHook!=NULL); [K,&s8N5  
} 6dV92:  
BOOL UnInit() Wk`G+VR+  
{ e%#9|/uP  
 if(nHookCount>1){ Bm1yBKjO  
  nHookCount--; J=5G<  
  return TRUE; 5{VrzzOK}  
 } 9_oIAn:<  
 BOOL unhooked = UnhookWindowsHookEx(hHook); x-Yt@}6mvl  
 if(unhooked==TRUE){ @:X~^K.  
  nHookCount=0; U_Id6J]8  
  hHook=NULL; :43K)O"  
 } WnU"&XZ  
 return unhooked; 76(&O  
} > PfYHO  
OP{ d(~+  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) IYb@@Jzo  
{ xqX~nV#TB  
 BOOL bAdded=FALSE; }>fL{};Z"  
 for(int index=0;index<MAX_KEY;index++){ 4, 8gf2  
  if(hCallWnd[index]==0){ mbU[fHyV  
   hCallWnd[index]=hWnd; >cQ*qXI0  
   HotKey[index]=cKey; qbpvTTF  
   HotKeyMask[index]=cMask; ZI-)'  
   bAdded=TRUE; Ju Kj  
   KeyCount++; 9-I;'  
   break; P*Uu)mG)G  
  } |&o%c/  
 } mq do@  
 return bAdded; Fn yA;,*  
} #P<v[O/rA  
i` n,{{x&4  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) esWgYAc3{  
{ ySL 31%  
 BOOL bRemoved=FALSE; 7{2knm^  
 for(int index=0;index<MAX_KEY;index++){ M n3cIGL  
  if(hCallWnd[index]==hWnd){ ts aD5B  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4L(axjMYU  
    hCallWnd[index]=NULL; Cir==7A0  
    HotKey[index]=0; _\1wLcFj  
    HotKeyMask[index]=0; \&n]W\  
    bRemoved=TRUE; KzG8K 6wZ  
    KeyCount--; 8!'#B^  
    break; s'J8E+&5  
   } `b+f^6SJn  
  } Q9]7.^l  
 } <G/O!02  
 return bRemoved; 'cu( Sd}  
} Gmf.lHr$%  
y/'2WO[  
void VerifyWindow() It!PP1$   
{ Z ~:S0HDP  
 for(int i=0;i<MAX_KEY;i++){ Da0E)  
  if(hCallWnd!=NULL){ ej]^VS7w[r  
   if(!IsWindow(hCallWnd)){ !Z`~=n3bk  
    hCallWnd=NULL; :OUNZDL  
    HotKey=0; Q+[gGe JUF  
    HotKeyMask=0; z+C>P4c-y&  
    KeyCount--; HJ:s)As  
   } HBXp#$dPc  
  } _A;jtS)SY  
 } l%oie1g l  
} ]Jq1b210  
eh&?BP?  
BOOL CHookApp::InitInstance() mTwz&N\  
{ !FX;QD@"  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); *}$T:kTH  
 hins=AfxGetInstanceHandle(); ![18+Q\  
 InitHotkey(); 50F6jj  
 return CWinApp::InitInstance(); pJ;J>7Gt  
} 5rr7lw WZ  
1>[3(o3t  
int CHookApp::ExitInstance() @{:E&K1f  
{ *1$rg?yGf  
 VerifyWindow(); ~ b!mKyrZ  
 UnInit(); Ola>] 0l  
 return CWinApp::ExitInstance(); BOQ2;@:3  
} tz4MT_f  
hCD0Zel  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file hHm &u^xY  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) {Nuwz|Ci  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ U"v(9m@  
#if _MSC_VER > 1000 No=Ig-It  
#pragma once [-x~Q[  
#endif // _MSC_VER > 1000 @kenv3[Lc  
a]>gDDF  
class CCaptureDlg : public CDialog 7<<pP  
{ ;O}%_ef@  
 // Construction bjmUU6VLT  
 public: Ia=wf"JS)  
  BOOL bTray; Xw(e@ :  
  BOOL bRegistered; Z2_eTC u  
  BOOL RegisterHotkey(); ),(ejRP'r  
  UCHAR cKey; cZuZfMDM  
  UCHAR cMask; (wdE@/V  
  void DeleteIcon(); RY8;bUSR  
  void AddIcon(); q.yS j  
  UINT nCount; Cg |_ ) _w  
  void SaveBmp(); Oz# $x  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 3;zJ\a.+  
  // Dialog Data  ?}e8g  
  //{{AFX_DATA(CCaptureDlg) Og4 X3QG  
  enum { IDD = IDD_CAPTURE_DIALOG }; DN2K4%cM%'  
  CComboBox m_Key; KJo [!|.  
  BOOL m_bControl; AU)"L_ i}  
  BOOL m_bAlt; R] tHd=kf  
  BOOL m_bShift; N)K};yMf  
  CString m_Path; E ~<SEA  
  CString m_Number;  oJ ~ZzW  
  //}}AFX_DATA E3<jH  
  // ClassWizard generated virtual function overrides Kn SXygT  
  //{{AFX_VIRTUAL(CCaptureDlg) QXY-?0RO#  
 public: };o6|e:2E  
  virtual BOOL PreTranslateMessage(MSG* pMsg); *]nha1!S  
 protected: OmQSNU.our  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support UO47XAO  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); TG8QT\0G  
  //}}AFX_VIRTUAL UTGR{>=>  
  // Implementation IHZ WNT2  
 protected: 7Vr .&`l  
  HICON m_hIcon; j0B, \A  
  // Generated message map functions ~ ' 81  
  //{{AFX_MSG(CCaptureDlg) ^W5rL@h_  
  virtual BOOL OnInitDialog(); .Qg!_C  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); kSv?p1\@&P  
  afx_msg void OnPaint(); $qYtN`b,  
  afx_msg HCURSOR OnQueryDragIcon(); z'=*pIY5f  
  virtual void OnCancel(); iT1"Le/N  
  afx_msg void OnAbout(); !MS z%QcO  
  afx_msg void OnBrowse(); =unMgX]$  
  afx_msg void OnChange(); M7-piRnd4  
 //}}AFX_MSG .7++wo!,  
 DECLARE_MESSAGE_MAP() O`~G'l&@T  
}; )HNbWGu  
#endif BQ{Gp 2N  
TS^(<+'  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file jz QmYcd  
#include "stdafx.h" m3 C&QdjRp  
#include "Capture.h" JryDbGc8  
#include "CaptureDlg.h" ](a*R  
#include <windowsx.h> <?kr"[cQeP  
#pragma comment(lib,"hook.lib") fQi7e5  
#ifdef _DEBUG $IX>o&S@|  
#define new DEBUG_NEW QDYS}{A:V  
#undef THIS_FILE .\= GfF'  
static char THIS_FILE[] = __FILE__; 9:4PJ%R9  
#endif `e .;P  
#define IDM_SHELL WM_USER+1 O6LZ<}oUR  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;ob-'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [7q~rcf,Z  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Ap9CQ h=!  
class CAboutDlg : public CDialog B;XFPQ#b  
{ x.qn$?3V]  
 public: ?`V%[~4_I  
  CAboutDlg(); rp u9  
  // Dialog Data M>P-0IC  
  //{{AFX_DATA(CAboutDlg) ;ZPAnd:pb  
  enum { IDD = IDD_ABOUTBOX }; .%_scNP  
  //}}AFX_DATA d!7cIYVZ  
  // ClassWizard generated virtual function overrides KT~J@];Fb  
  //{{AFX_VIRTUAL(CAboutDlg) %Ez%pT0TQ#  
 protected: O|m-Uz"+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3.U5Each-  
  //}}AFX_VIRTUAL zB/$*Hd  
  // Implementation !;.i#c_u  
 protected: } R!-*Wk  
  //{{AFX_MSG(CAboutDlg) o[q Kf  
  //}}AFX_MSG #qWa[kB  
  DECLARE_MESSAGE_MAP()  /s.sW l  
}; ?1?D[7$  
y;<^[  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) XmXp0b7  
{ ,u^i0uOg  
 //{{AFX_DATA_INIT(CAboutDlg) zD}dvI}  
 //}}AFX_DATA_INIT H>AQlO+J  
} CT+pkNC  
jJdw\`  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 7].tt  
{ oNY;z-QK  
 CDialog::DoDataExchange(pDX); \g< M\3f  
 //{{AFX_DATA_MAP(CAboutDlg) PeEf=3  
 //}}AFX_DATA_MAP :]iV*zo_  
} B;9X{"  
s`GwRH<#  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) *2N$l>ql:k  
 //{{AFX_MSG_MAP(CAboutDlg) \gaGTc2&  
 // No message handlers Ug*:o d  
 //}}AFX_MSG_MAP Os' 7h  
END_MESSAGE_MAP() Rd|};-  
GV#"2{t j  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) EpSVHD:*  
: CDialog(CCaptureDlg::IDD, pParent) e#JJd=  
{ Ta`=c0  
 //{{AFX_DATA_INIT(CCaptureDlg) ,2q LiE>  
  m_bControl = FALSE; )%Z<9k  
  m_bAlt = FALSE; o7<pI8\  
  m_bShift = FALSE; rU`#3}s  
  m_Path = _T("c:\\"); SjV;& 1Z/  
  m_Number = _T("0 picture captured."); "& 'h\  
  nCount=0; cdVh_"[  
  bRegistered=FALSE; Ql&5fyW  
  bTray=FALSE; M@EML @~  
 //}}AFX_DATA_INIT \&ra&3o  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 hE0 p> R8  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &dp<i[ec^  
} U1G"T(;s:  
jR`q  y<  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Tm~a& p  
{ L^uO.eI"m  
 CDialog::DoDataExchange(pDX); $50A!h  
 //{{AFX_DATA_MAP(CCaptureDlg) vggyQf%  
  DDX_Control(pDX, IDC_KEY, m_Key); ^55#!/9  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); +#7 e?B  
  DDX_Check(pDX, IDC_ALT, m_bAlt); W- 5Z"m1I  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); O`1_eK~1<  
  DDX_Text(pDX, IDC_PATH, m_Path); d|CSWcU  
  DDX_Text(pDX, IDC_NUMBER, m_Number); \)'s6>58|  
 //}}AFX_DATA_MAP ts/ rV#s~  
} F B-?{78~  
V`qHNM/t  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) iV;X``S  
//{{AFX_MSG_MAP(CCaptureDlg) u^T)4~(  
 ON_WM_SYSCOMMAND() &QFg=  
 ON_WM_PAINT() bzD <6Z  
 ON_WM_QUERYDRAGICON() SVWtKc<  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 4%>iIPXi.(  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) d6,SZ*AE  
 ON_BN_CLICKED(ID_CHANGE, OnChange) .E}fk,hLB  
//}}AFX_MSG_MAP k44s V.G4L  
END_MESSAGE_MAP() L;$Gn"7~  
unu%\f>^4  
BOOL CCaptureDlg::OnInitDialog() $}RBK'cr}  
{ gBb+Q,  
 CDialog::OnInitDialog(); 3* C9;Q}  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); |pxM8g1w  
 ASSERT(IDM_ABOUTBOX < 0xF000); L]I ;{Y  
 CMenu* pSysMenu = GetSystemMenu(FALSE); r(-`b8ZE  
 if (pSysMenu != NULL) W,dqk=n  
 { de{@u<Y Zb  
  CString strAboutMenu; F,}wQ N  
  strAboutMenu.LoadString(IDS_ABOUTBOX); l2Z!;Wm(  
  if (!strAboutMenu.IsEmpty()) @)=\q`vV  
  { F_0vh;Jo  
   pSysMenu->AppendMenu(MF_SEPARATOR); TY}9;QL:  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); kSj,Pl\NC  
  } :H($|$\h  
 } 7(c7-  
 SetIcon(m_hIcon, TRUE); // Set big icon  V9\g?w  
 SetIcon(m_hIcon, FALSE); // Set small icon Z9TmX A@  
 m_Key.SetCurSel(0); 9NXf~-V-  
 RegisterHotkey(); 2k}~"!e1  
 CMenu* pMenu=GetSystemMenu(FALSE); a oj6/  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); | LdDL953  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); zMlW)NB'  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2VO bj7F  
 return TRUE; // return TRUE unless you set the focus to a control ? IgM=@  
} %GS^=Qr  
vt)u`/u  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) <^>O<P:v  
{ ,S QmQ6h  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) _"Yi>.{]  
 { bV c"'RQ  
  CAboutDlg dlgAbout; &L6xagR7M  
  dlgAbout.DoModal(); FVw;`{  
 } g2Pa-}{  
 else NvCq5B$C  
 { %6Wv-:LY  
  CDialog::OnSysCommand(nID, lParam); O6JH)Ka"S  
 } j"g[qF/*  
} P X/{  
5WJof`M  
void CCaptureDlg::OnPaint() +b@KS"3h  
{ !Ab4'4f  
 if (IsIconic()) esE5#Yq4.k  
 { b5WtL+Z  
  CPaintDC dc(this); // device context for painting z+IHt(  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); O*% 1   
  // Center icon in client rectangle 7;0$UYDU*  
  int cxIcon = GetSystemMetrics(SM_CXICON); ,m ^q >  
  int cyIcon = GetSystemMetrics(SM_CYICON); n:QFwwQ`Q;  
  CRect rect; ^yLiyRe\  
  GetClientRect(&rect); IJX75hE0g  
  int x = (rect.Width() - cxIcon + 1) / 2; 'Pk1 4`/  
  int y = (rect.Height() - cyIcon + 1) / 2; es]S]}JV  
  // Draw the icon o[<lTsw<  
  dc.DrawIcon(x, y, m_hIcon); tx0`#x  
 } 9?M>Y?4  
 else .A 12Co  
 { 2e~ud9,  
  CDialog::OnPaint(); { |dU|h  
 } -jN:~.  
} G.Z4h/1<  
Z*r;"WHB  
HCURSOR CCaptureDlg::OnQueryDragIcon() qu>5 rg-  
{ EPO*{bN7O  
 return (HCURSOR) m_hIcon; Tgxxm  
} $'m&RzZ  
%K@s0uQ  
void CCaptureDlg::OnCancel() bWp40&vx  
{ m]}%Ag^x  
 if(bTray) {zGM[A  
  DeleteIcon(); &U <t*"  
  CDialog::OnCancel(); #$/SM_X14C  
} P!uwhha/g  
H#P)n R M  
void CCaptureDlg::OnAbout() H_3-"m&3  
{ H{&o_  
 CAboutDlg dlg; o]Ln:kl  
 dlg.DoModal(); #L,>)XkjS  
} rID_^g_tP8  
vpTYfE  
void CCaptureDlg::OnBrowse() 4(2iR0N  
{ a-nf5w>&q  
 CString str; 24 )Sf  
 BROWSEINFO bi; |n9q 4*dN  
 char name[MAX_PATH]; /m>%=_nz  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); !\e&7sV~Q  
 bi.hwndOwner=GetSafeHwnd(); \gtI4zl*J  
 bi.pszDisplayName=name; E]Wnl\Be  
 bi.lpszTitle="Select folder"; >|Xy'ZR  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; kd0~@rPL  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); b \pjjb[  
 if(idl==NULL) 4i<V^go"  
  return; BNA`Cc1VV  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); , Oqd4NS  
 str.ReleaseBuffer(); /K+GM8rtE  
 m_Path=str; L p(6K  
 if(str.GetAt(str.GetLength()-1)!='\\') }Z^r<-N  
  m_Path+="\\"; 4[q'1N6-  
 UpdateData(FALSE); ^Ob#B!=  
} W PDL$y  
*^h$%<QI  
void CCaptureDlg::SaveBmp()  D I` M  
{ f[S$ Gu4-  
 CDC dc; .nGYx  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ry99R|/d1  
 CBitmap bm; pUTC~|j%:  
 int Width=GetSystemMetrics(SM_CXSCREEN); V%kZ-P*  
 int Height=GetSystemMetrics(SM_CYSCREEN); CuS"Wj  
 bm.CreateCompatibleBitmap(&dc,Width,Height); A4C4xts]N  
 CDC tdc; FrPpRe%!  
 tdc.CreateCompatibleDC(&dc); l~cT]Ep  
 CBitmap*pOld=tdc.SelectObject(&bm); %Fb4   
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); kaKV{;UM  
 tdc.SelectObject(pOld); jGp|:!'w  
 BITMAP btm; .JkcCEe{G  
 bm.GetBitmap(&btm); D7'P^*4_B  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ^;KL`  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size);  (C1@f!Z  
 BITMAPINFOHEADER bih; >pS @;t'  
 bih.biBitCount=btm.bmBitsPixel;  vbol 70  
 bih.biClrImportant=0; , [ogh  
 bih.biClrUsed=0; Y(:.f-Du  
 bih.biCompression=0; O(P ,!  
 bih.biHeight=btm.bmHeight; ="M7F0k  
 bih.biPlanes=1; 0O_acO 4  
 bih.biSize=sizeof(BITMAPINFOHEADER); \I3={ii0  
 bih.biSizeImage=size; ]7#@lL;'0  
 bih.biWidth=btm.bmWidth; \QpH~&QIS  
 bih.biXPelsPerMeter=0; iJIDx9 )Z  
 bih.biYPelsPerMeter=0; d{~5tv- H  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); =CCxY7)M+.  
 static int filecount=0; 4^? J BpBZ  
 CString name; >'qkW$-95  
 name.Format("pict%04d.bmp",filecount++); Dg:2*m_!j{  
 name=m_Path+name; 4nIs+  
 BITMAPFILEHEADER bfh; >_ )~"Ra  
 bfh.bfReserved1=bfh.bfReserved2=0; {e>E4(  
 bfh.bfType=((WORD)('M'<< 8)|'B'); IV#kF}9$  
 bfh.bfSize=54+size; KINKq`Sx  
 bfh.bfOffBits=54; &HS6}  
 CFile bf; hM": ?Rx  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ W0++q=F  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); AX {~A:B  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); %`o3YR  
  bf.WriteHuge(lpData,size); k1EAmA l  
  bf.Close(); "CS {fyJ  
  nCount++; M*& tVG   
 } S6J7^'h  
 GlobalFreePtr(lpData); yUZ;keQ_Tw  
 if(nCount==1) !A5UT-  
  m_Number.Format("%d picture captured.",nCount); $U{ \T4  
 else ]+ \]2`?  
  m_Number.Format("%d pictures captured.",nCount); ?2;gmZd7  
  UpdateData(FALSE); hH=H/L_Z  
} Q%x |  
3A~53W$M  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) n'dxa<F2|  
{ Pk9 4O  
 if(pMsg -> message == WM_KEYDOWN) 3IrmDT  
 { Do&em8i z  
  if(pMsg -> wParam == VK_ESCAPE) R0 g-  
   return TRUE; 1|+Z mo"  
  if(pMsg -> wParam == VK_RETURN) Pf?*bI  
   return TRUE; ,gvv297  
 } ujo3"j[b  
 return CDialog::PreTranslateMessage(pMsg); l1Zf#]x  
} )\iO wA  
hx'p0HDta  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @M:Uf7  
{ %*>ee[^L ,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \~3g*V  
  SaveBmp(); jz\LI  
  return FALSE; yNw YP%"y  
} #i#4h<R  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @0XqUcV  
 CMenu pop; [sM~B  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); qre.^6x  
 CMenu*pMenu=pop.GetSubMenu(0); =bVaB<!  
 pMenu->SetDefaultItem(ID_EXITICON); aNqhxvwf  
 CPoint pt; YW|KkHi*  
 GetCursorPos(&pt); "IK QFt'  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); q#8$@*I  
 if(id==ID_EXITICON) H*l2,0&W  
  DeleteIcon(); 9M$=X-  
 else if(id==ID_EXIT) "y%S.ipWG  
  OnCancel(); 4 Ar\`{c>  
 return FALSE; $LS$:%i4  
} fgb%SIi?  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); dkz79G}e  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) GzJ("RE0)v  
 AddIcon(); {V> >a  
 return res; rv(Qz|K@  
} -^y$RJC  
YQB.3  
void CCaptureDlg::AddIcon() HzW`j"\  
{  CB<i  
 NOTIFYICONDATA data; YKjm_)8]w  
 data.cbSize=sizeof(NOTIFYICONDATA); 8=]R6[,fD  
 CString tip; -SZW[T<N"  
 tip.LoadString(IDS_ICONTIP); l7{Xy_66  
 data.hIcon=GetIcon(0); l9U^[;D  
 data.hWnd=GetSafeHwnd(); )PM&x   
 strcpy(data.szTip,tip); qRD]Q  
 data.uCallbackMessage=IDM_SHELL; Z3ucJH/)V  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Qx9lcO_  
 data.uID=98; a0vg%Z@!  
 Shell_NotifyIcon(NIM_ADD,&data); t@a2@dX|  
 ShowWindow(SW_HIDE); C?UV3  
 bTray=TRUE; ZDmBuf q  
} QzjLKjl7p4  
^%^~:<N  
void CCaptureDlg::DeleteIcon() 0>uMR{ #  
{ Q%.V\8#|V  
 NOTIFYICONDATA data; 4X0k1Fw)Y  
 data.cbSize=sizeof(NOTIFYICONDATA); [Rz9Di ;  
 data.hWnd=GetSafeHwnd(); E^I|%F  
 data.uID=98; Us4ijR d  
 Shell_NotifyIcon(NIM_DELETE,&data); vgfLI}|5  
 ShowWindow(SW_SHOW); =:T pH>f*  
 SetForegroundWindow(); "?I]h  
 ShowWindow(SW_SHOWNORMAL); (GLd" Zq  
 bTray=FALSE; T.1*32cX  
} gFJ. p  
aY^_+&&G  
void CCaptureDlg::OnChange() dS7?[[pg9  
{ L*2YAIG  
 RegisterHotkey(); cx]&ae*  
} jQAK ?7':=  
__}j {Buk  
BOOL CCaptureDlg::RegisterHotkey() mL!)(Bb  
{ Q4gsOx P  
 UpdateData(); +?xW%omy  
 UCHAR mask=0; +doZnU,  
 UCHAR key=0; -}liG  
 if(m_bControl) &N{XLg>  
  mask|=4; /V66P@[>  
 if(m_bAlt) F,Ls1  
  mask|=2; 0]tr&BLl*  
 if(m_bShift) ={Bcbj{  
  mask|=1; 4I"p>FIkY  
  key=Key_Table[m_Key.GetCurSel()]; [m>kOv6>^  
 if(bRegistered){ eq0&8/=  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); aS^ 4dEJ  
  bRegistered=FALSE; "3kIQsD|j  
 } b)+;#m  
 cMask=mask; s~ZLnEb  
 cKey=key; `QH-VR\_  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); NaeG2>1  
 return bRegistered; x|#R$^4CY  
} PcXz4?Q$  
S#IlWU  
  四、小结 Cr?|bDv}o  
!J3dlUFRO  
  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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