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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: +BM(0M+  
  f5Zx:g  
  一、实现方法 z![RC59 S  
BM1uZJ0  
  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: "Sc_E}q |e  
Ta%{Wa\U9z  
#pragma data_seg("shareddata") &2MW.,e7s  
HHOOK hHook =NULL; //钩子句柄 >.SU= HG;  
UINT nHookCount =0; //挂接的程序数目 WtFv"$V  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 FlRbGg^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 I' ej?~  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 0eQyzn*98  
static int KeyCount =0; D(s[=$zua  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 fEWS3`Yy  
#pragma data_seg() 6?Rm>+2>v  
d /jO~+jP  
  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。 Lcf =)GL  
)Rn}4)9!iT  
  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: ~a4htj  
+L!-JrYHS4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ngcXS2S_  
cKey,UCHAR cMask) ea=@r Ng  
{ I`}-*% ki(  
 BOOL bAdded=FALSE; OO] ~\j  
 for(int index=0;index<MAX_KEY;index++){ OnC|9  
  if(hCallWnd[index]==0){ B5IS-d  
   hCallWnd[index]=hWnd; O$E3ry+?  
   HotKey[index]=cKey; lq}=&)%C  
   HotKeyMask[index]=cMask; ?0WJB[/  
   bAdded=TRUE; -wy$ ?Ha  
   KeyCount++; [7ZFxr\:!  
   break; bg*4Z?[dd  
  } d Ayof=  
 } bBc<yaN  
 return bAdded; t]#y} V  
} fKf5i@CvB@  
//删除热键 ;WC]Lf<Z^  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =2BGS\$#  
{ cXFNX<  
 BOOL bRemoved=FALSE; '`#2'MXG  
 for(int index=0;index<MAX_KEY;index++){ o> WH;EBL  
  if(hCallWnd[index]==hWnd){ **d3uc4y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ EkgS*q_  
    hCallWnd[index]=NULL; R)"Ds}1G  
    HotKey[index]=0; 'xm_oGWE  
    HotKeyMask[index]=0; ~z$vF  
    bRemoved=TRUE; "GEJ9_a[  
    KeyCount--; YQvN;W  
    break; :D8V*F6P  
   } \C5YVl#  
  } <LIL{g0eX  
 } rP>iPDf  
 return bRemoved; 6e(|t2^  
} F=U3o=-:  
 #:_qo  
ya0L8`q  
  DLL中的钩子函数如下: Fd":\7p  
TYGUB%A  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) nR-`;lrF~  
{ +pZ, RW.D  
 BOOL bProcessed=FALSE; OW- [#r  
 if(HC_ACTION==nCode) 1T a48  
 { S H2|xn  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 uIvy1h9m  
   switch(wParam) +!6aB|-  
   {  M>VT$!Lx  
    case VK_MENU: 3`S|I_$(T"  
     MaskBits&=~ALTBIT; k3h,c;  
     break; eVyXh>b*  
    case VK_CONTROL: fhw.A5Ck  
     MaskBits&=~CTRLBIT; q{5wx8_U  
     break; YQ9@Dk0R  
    case VK_SHIFT: Kq@nBkO4  
     MaskBits&=~SHIFTBIT; 19Xc0ez  
     break; OvqCuX  
    default: //judge the key and send message kNP.0  
     break; 1OJD!juL$  
   } mr dG- t(k  
   for(int index=0;index<MAX_KEY;index++){ W L$nchS9  
    if(hCallWnd[index]==NULL) { </MC`  
     continue; p\T9 q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *{8<4CVv  
    { eL3HX _2(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,e{(r0  
     bProcessed=TRUE; 64;F g/t  
    } vp@%wxl!:  
   } MG)wVS<d_  
  } PPSf8-MLW  
  else if((lParam&0xc000ffff)==1){ //有键按下 VU3xP2c:  
   switch(wParam) ):OGhWq  
   { c6FKpdn%  
    case VK_MENU: 35I y\  
     MaskBits|=ALTBIT; S`HshYlE q  
     break; :9un6A9JS  
    case VK_CONTROL: l*_%K}%?V  
     MaskBits|=CTRLBIT; iU3)4(R  
     break; /z:pid,_0  
    case VK_SHIFT: [~03Z[_"/  
     MaskBits|=SHIFTBIT; 0f~7n*XH  
     break; 'zCJK~x`x  
    default: //judge the key and send message R|aA6} /I  
     break; {* S8n09v  
   } Ylbh_ d~BU  
   for(int index=0;index<MAX_KEY;index++){ 1-[~}  
    if(hCallWnd[index]==NULL) e+jp03m\W  
     continue; 7KIOI,qb6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ncr38~;w  
    { )D\cm7WX^[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); (qd$wv^ h  
     bProcessed=TRUE; k$ k /U  
    } >;V ? s]  
   } @i'24Q[6  
  } %zj;~W;qPH  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 0sq?;~U  
   for(int index=0;index<MAX_KEY;index++){ _=W ^#z  
    if(hCallWnd[index]==NULL) #?%akQ+w  
     continue; C"l_78  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) &"GHD{ix  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .Rt_j  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 /3|uU  
   } +~, qb1aZ  
  } xbJ@z {  
 } S~jl%]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )=VSERs  
} }p-<+sFo  
;\(Wz5Ok&J  
  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:  +C3IP  
L~e\uP  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qh}M!p2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hKq <e%oVH  
(I3:u-A  
  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: tln*Baq  
VYw vT0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gQy {OU  
{ zTi %j$o  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) S"?py=7  
 { >XzCHtEP  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 WBTdQG Q6  
  SaveBmp(); "0Xa?z8"  
  return FALSE; \(UEjlo  
 } `>:ozN#)\  
 …… //其它处理及默认处理 i<<NKv8;  
} ydp?%RB3w  
TTjj.fq6  
', -4o-  
  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。 c-nBB  
`_{'qqRhe  
  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。  _Y@'<S.  
>L$g ;(g  
  二、编程步骤 #;. tVo I  
e6s-;  
  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"; w <zO  
$-""=O|"   
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; M7vc/E}]n  
/|] %0B  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; MsOO''o  
#W<D~C[I _  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 1G/bqIMg63  
f:L%th  
  5、 添加代码,编译运行程序。 -L7Q,"a$  
I^ W  
三、程序代码 >O[# 661  
6L@g]f|Y@  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 'qBg^c  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) =]x FHw8A  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ `T  $lTP  
#if _MSC_VER > 1000 nIVPh99  
#pragma once ]D&$k P(  
#endif // _MSC_VER > 1000 d#7 z N  
#ifndef __AFXWIN_H__ `WF?87l1  
#error include 'stdafx.h' before including this file for PCH Q1V4bmM  
#endif 2GECcx53  
#include "resource.h" // main symbols -)@DH;[tb  
class CHookApp : public CWinApp *=}$@O S  
{ ~V3pj('/)'  
 public: %w7J0p  
  CHookApp();  8YFfnk  
  // Overrides 6TS+z7S81L  
  // ClassWizard generated virtual function overrides h &9Ld:p  
  //{{AFX_VIRTUAL(CHookApp) }_}C ^  
 public: '7[{ISBXU  
  virtual BOOL InitInstance(); w#k'RuOw5  
  virtual int ExitInstance(); y|V/xm+Fp  
  //}}AFX_VIRTUAL k <ds7k1m  
  //{{AFX_MSG(CHookApp) S:{hgi,T*  
  // NOTE - the ClassWizard will add and remove member functions here. J!%Yy\G  
  // DO NOT EDIT what you see in these blocks of generated code ! &O5%6Sv3d  
  //}}AFX_MSG [La=z 7*  
  DECLARE_MESSAGE_MAP() |mV*HdqU  
}; n5"rSgUtE  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); MdT'xYomzQ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -fVeE<[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O-:#Q(H!  
BOOL InitHotkey(); KZeRbq2 jJ  
BOOL UnInit(); ":?>6'*1  
#endif a_'W1ek-@  
wG2lCv`d  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Jis{k$4  
#include "stdafx.h" -wlob`3  
#include "hook.h" 3toY#!1Ch  
#include <windowsx.h> /ow/)\/}  
#ifdef _DEBUG VcIsAK".4[  
#define new DEBUG_NEW MGX %U6  
#undef THIS_FILE NS6Bi3~  
static char THIS_FILE[] = __FILE__; -QCo]:cp  
#endif b")&"o)G2W  
#define MAX_KEY 100 vG#|CO9  
#define CTRLBIT 0x04 $bh2zKB)  
#define ALTBIT 0x02 ovzIJbf  
#define SHIFTBIT 0x01 uF9p:FvN8  
#pragma data_seg("shareddata") zTrAk5E  
HHOOK hHook =NULL; @^} % o-:  
UINT nHookCount =0; c`mJrS:  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey fm87?RgXD  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT F%bv vw*(  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey  IPa08/  
static int KeyCount =0; |gx{un`  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift fGb(=l  
#pragma data_seg() xZPSoxu  
HINSTANCE hins; DSYtj} >  
void VerifyWindow(); 6tI7vLmG  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) i;*c|ma1>  
//{{AFX_MSG_MAP(CHookApp) I>bLgt]u3  
// NOTE - the ClassWizard will add and remove mapping macros here.  S20x  
// DO NOT EDIT what you see in these blocks of generated code! FIlw  
//}}AFX_MSG_MAP ;SeDxyKG  
END_MESSAGE_MAP() xT{qeHeZ9,  
[yL %+I  
CHookApp::CHookApp() n_AW0i .  
{ D; H</5#Q  
 // TODO: add construction code here, X_+`7yCi"x  
 // Place all significant initialization in InitInstance G{}E~jDi?  
} gWqmK/.U.0  
>},O_qx  
CHookApp theApp; "v/^nH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }lML..((1  
{ ' IFbD["r  
 BOOL bProcessed=FALSE; 5&v'aiWK  
 if(HC_ACTION==nCode) IE: x&q`3  
 { c%>t(ce`Tl  
  if((lParam&0xc0000000)==0xc0000000){// Key up |;6FhDW+'  
   switch(wParam) (<s7X$(]e  
   { 6#7f^uIK  
    case VK_MENU: p]*$m=t0r  
     MaskBits&=~ALTBIT; dP T)&  
     break; M3K+;-n^  
    case VK_CONTROL: . Uv7{(  
     MaskBits&=~CTRLBIT; \r^=W=  
     break; hz<kR@k}  
    case VK_SHIFT: Hlp!6\gukp  
     MaskBits&=~SHIFTBIT; u3Z*hs)Z%  
     break; l6Ze6X I  
    default: //judge the key and send message ,[,+ _A  
     break; g~h`wv'  
   } pwT|T;j*  
   for(int index=0;index<MAX_KEY;index++){ >wej1#\3  
    if(hCallWnd[index]==NULL) kGc;j8>."  
     continue; 8xDS eXh;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) jkQv cU  
    { 5b0Ipg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ko\m8\3?fK  
     bProcessed=TRUE; 7~C@x+1S/  
    } W:4]-i?2  
   } +>KWY PH  
  } U&C\5N]  
  else if((lParam&0xc000ffff)==1){ //Key down =R:3J"ly0  
   switch(wParam) '1~mnmiP  
   { Ayc}uuu  
    case VK_MENU: }/x `w  
     MaskBits|=ALTBIT; a ^iefwsNc  
     break; ]d_Id]Qa+  
    case VK_CONTROL: !lm^(SSv  
     MaskBits|=CTRLBIT; q-/A_5>!;f  
     break; .(VxeF(v_k  
    case VK_SHIFT: 0gm+R3;k^  
     MaskBits|=SHIFTBIT; 1& YcCN\k  
     break; l@q.4hT  
    default: //judge the key and send message <'v?WV_  
     break; h\Op|#gIT  
   } F:n(yXA  
   for(int index=0;index<MAX_KEY;index++) ']u w,b  
   { *ls}r5k2Y  
    if(hCallWnd[index]==NULL) SgAY/#  
     continue; 92]>"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \|@]XNSN  
    { L'J$jB5cP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); )+RGXV p  
     bProcessed=TRUE; 4fr/ C5M  
    } 1N x%uz  
   } 9j49#wG0"B  
  } $f_;>f2N  
  if(!bProcessed){ *hF5cM[  
   for(int index=0;index<MAX_KEY;index++){ McNj TD  
    if(hCallWnd[index]==NULL) vs{i2!^  
     continue; RxAWX?9Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^.mQ~F  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <6mXlK3N0  
   } :)g=AhBF  
  } 1'"o; a]k/  
 }  L/%3_,  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~4=4Ks0  
} -869$  
REW *6:  
BOOL InitHotkey() {b<p~3%+Hc  
{ 9TO  
 if(hHook!=NULL){ 8n?P'iM  
  nHookCount++; 6>%)qc$i  
  return TRUE; }LM^>M%  
 } (5_l7hWY  
 else uWG'AmK_#E  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); isj<lnQ  
  if(hHook!=NULL) NlU:e}zGR  
   nHookCount++; 16keCG\  
  return (hHook!=NULL); J}i$ny_3OB  
} rxI?|}4  
BOOL UnInit() 8|dl t$  
{ j08 G-_Gjn  
 if(nHookCount>1){ FnP/NoZa>  
  nHookCount--; 1mJBxg}(  
  return TRUE; `;(/W h  
 } s_.q/D@vu  
 BOOL unhooked = UnhookWindowsHookEx(hHook); M98dQ%4I  
 if(unhooked==TRUE){ [m|\N  
  nHookCount=0; pb{'t2kk  
  hHook=NULL; uCNQ.Nbf C  
 } !z{bqPlFGG  
 return unhooked; *;m5^i<,;S  
} xHJ+!   
/6gqpzum4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )KaQ\WJ:   
{ Zu$f-_"  
 BOOL bAdded=FALSE; /!eC;qp;[  
 for(int index=0;index<MAX_KEY;index++){ NrgN{6u;  
  if(hCallWnd[index]==0){ C&NoEtL>s  
   hCallWnd[index]=hWnd; 59$mfW o>  
   HotKey[index]=cKey; 7_E+y$i=  
   HotKeyMask[index]=cMask; 6^mO<nB   
   bAdded=TRUE; HMgZ& v  
   KeyCount++; ?qHW"0Tjn  
   break; W7l/{a @  
  } _t:rWC"X  
 } ^gw_Up<e6  
 return bAdded; >LgV[D#=&o  
} s)375jCga  
9C-F%te7  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "2'nLQ""q  
{ ^\e:j7@z  
 BOOL bRemoved=FALSE; $* b>c:  
 for(int index=0;index<MAX_KEY;index++){ b-M[la}1"  
  if(hCallWnd[index]==hWnd){ $Z+N*w~8  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ t<|=-  
    hCallWnd[index]=NULL; fF_1ZKx+#!  
    HotKey[index]=0; kkyn>Wxv  
    HotKeyMask[index]=0; V*5:Vt7N  
    bRemoved=TRUE; RT)0I;  
    KeyCount--; ok-sm~bp  
    break; n4>  
   } >`5iq.v  
  } n2Dnpe:  
 } O(~`fN?n  
 return bRemoved; Q'*-gg&)  
} }}cVPB7   
BtBy.bR  
void VerifyWindow() f|Z3VS0x  
{ iWCN2om  
 for(int i=0;i<MAX_KEY;i++){ V F6OC4 K  
  if(hCallWnd!=NULL){ @K4} cP  
   if(!IsWindow(hCallWnd)){ J0d +q!  
    hCallWnd=NULL; M4nM%qRGQ  
    HotKey=0; v_{`O'#j^  
    HotKeyMask=0; '}P)iS2  
    KeyCount--; <H}"xp)j0  
   } EK@yzJ%  
  } KP _=#KD  
 } H#m)`=nZSZ  
} x2Y1B  
H<}<f:  
BOOL CHookApp::InitInstance() T oy~\  
{ :n0(gB  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); >]T(}S~  
 hins=AfxGetInstanceHandle(); +3s i=x\=/  
 InitHotkey(); [5)1 4% x  
 return CWinApp::InitInstance(); '3[Ecy#  
} dI>)4()  
S N?jxQ  
int CHookApp::ExitInstance() Tl8S|Rg  
{ L(`^T`  
 VerifyWindow(); @o9EX }  
 UnInit(); #mk#&i3"k  
 return CWinApp::ExitInstance(); baR{   
} 9^v|~f  
VG&|fekF  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file .N_0rPO,Kw  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) JF: QQ\  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~M(K{6R  
#if _MSC_VER > 1000 M (b'4  
#pragma once v{Zh!mk* L  
#endif // _MSC_VER > 1000 *: e^yi  
2?Q IK3"v  
class CCaptureDlg : public CDialog a=p3oh?%-O  
{ >bz}IcZP  
 // Construction 1'c!9  
 public: [Gh T.  
  BOOL bTray; &:akom8  
  BOOL bRegistered; 0u'2f`p*  
  BOOL RegisterHotkey(); hS*3yCE"8  
  UCHAR cKey; (mt,:hX  
  UCHAR cMask; [g=yuVXNZZ  
  void DeleteIcon(); }4cLU.L8O  
  void AddIcon(); U g]6i+rp  
  UINT nCount; d";+8S  
  void SaveBmp(); cFGP3Q4{  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor !uO|1b  
  // Dialog Data 0x[vB5R  
  //{{AFX_DATA(CCaptureDlg) ;o%r{:lng  
  enum { IDD = IDD_CAPTURE_DIALOG }; 0RtqqNFD  
  CComboBox m_Key; 4K0N$9pd:  
  BOOL m_bControl; P~ffgzP  
  BOOL m_bAlt; ^q FFF3<8  
  BOOL m_bShift; [m3G%PO@Da  
  CString m_Path; ^:{l~~9iKp  
  CString m_Number; jBI VZ!X  
  //}}AFX_DATA w^G<]S {l  
  // ClassWizard generated virtual function overrides O:xRUjpL  
  //{{AFX_VIRTUAL(CCaptureDlg) HxU.kcf  
 public: h(GgkTj4+  
  virtual BOOL PreTranslateMessage(MSG* pMsg); \w^U<_zq  
 protected: qa`bR%eH  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support NZ7a^xT_)  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); /}#z/m@bN  
  //}}AFX_VIRTUAL ofcoNLX5c  
  // Implementation #`y7L4V*o  
 protected: 6dC!&leNi  
  HICON m_hIcon; 9p2"5x  
  // Generated message map functions ,8+SQo #3  
  //{{AFX_MSG(CCaptureDlg) p8Lb*7W  
  virtual BOOL OnInitDialog(); z[z'.{;D  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); p*#SSR9<  
  afx_msg void OnPaint(); [7|}h/  
  afx_msg HCURSOR OnQueryDragIcon(); ;op+~@*!  
  virtual void OnCancel(); qO&:J\d  
  afx_msg void OnAbout(); e3) rF5pp  
  afx_msg void OnBrowse(); C*kZ>mbc  
  afx_msg void OnChange(); W`6nMFg  
 //}}AFX_MSG VIAj]Ul  
 DECLARE_MESSAGE_MAP() (zk'i13#6  
}; Sh2q#7hf  
#endif >,uof?  
Xw9,O8}C7  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file e)!X9><J  
#include "stdafx.h" A ;Z%-x  
#include "Capture.h" q Z`@Ro  
#include "CaptureDlg.h" kj@#oLd%  
#include <windowsx.h> Qs#v/r  
#pragma comment(lib,"hook.lib") ^a<=@0|  
#ifdef _DEBUG WAqR70{KM  
#define new DEBUG_NEW isWB)$q  
#undef THIS_FILE 'e;*V$+  
static char THIS_FILE[] = __FILE__; [A*vl9=  
#endif Gxm+5q  
#define IDM_SHELL WM_USER+1 |],{kUIXO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); rIW`(IG_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;X|;/@@  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; zr84%_^  
class CAboutDlg : public CDialog KW+^9&lA  
{ F4kU) i  
 public: &rcr])jg[  
  CAboutDlg(); W 86S)+h  
  // Dialog Data 'qQ DM_+  
  //{{AFX_DATA(CAboutDlg) 0<!kGL5  
  enum { IDD = IDD_ABOUTBOX }; C(e!cOG  
  //}}AFX_DATA P*I\FV  
  // ClassWizard generated virtual function overrides AWD &K!  
  //{{AFX_VIRTUAL(CAboutDlg) '~liDz*O   
 protected: \ {"8(ELX  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xhg{!w  
  //}}AFX_VIRTUAL d@,q6R}!MP  
  // Implementation z7HC6{g%X  
 protected: 0e:KiUr  
  //{{AFX_MSG(CAboutDlg) J +<|8D  
  //}}AFX_MSG VR*5}Qp  
  DECLARE_MESSAGE_MAP() 7dV^35 KP  
}; asPD>jc  
Lm-}W "7  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) jD H)S{k  
{ c7 wza/r>  
 //{{AFX_DATA_INIT(CAboutDlg) 4zJ9bF4  
 //}}AFX_DATA_INIT "/ @ ;6   
} ^h^j:!76j  
6K?+adKlc  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 05|t  
{ h>bmHQ  
 CDialog::DoDataExchange(pDX); ,A[HYc|uy  
 //{{AFX_DATA_MAP(CAboutDlg) 7F}I.,<W  
 //}}AFX_DATA_MAP 7@+0E 2'  
} Cv;z^8PZJz  
`n5RDz/f0  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) g.F{yX]  
 //{{AFX_MSG_MAP(CAboutDlg) F^A1'J  
 // No message handlers +/x|P-  
 //}}AFX_MSG_MAP ~X`vRSrH  
END_MESSAGE_MAP() O}#*U+j  
M 80Us.  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) iDHmS6_c  
: CDialog(CCaptureDlg::IDD, pParent) r)U9u 0  
{ \f /<#'  
 //{{AFX_DATA_INIT(CCaptureDlg) 6"&&s  
  m_bControl = FALSE; d{ OY  
  m_bAlt = FALSE; Z;WqKIM#  
  m_bShift = FALSE; G=yQYsC$  
  m_Path = _T("c:\\"); BtU,1`El5  
  m_Number = _T("0 picture captured."); El"XF?OgpP  
  nCount=0; TN/I(pkt1B  
  bRegistered=FALSE; MKoN^(7  
  bTray=FALSE; ]6=cSs!  
 //}}AFX_DATA_INIT %[NefA(  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 pjjs'A*y  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); wx<5*8zP  
} LjxTRtB_  
F\,3z7s  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Y`lC4*g  
{ MzJ5_}  
 CDialog::DoDataExchange(pDX); "uZ'oN  
 //{{AFX_DATA_MAP(CCaptureDlg) ^+,mxV'8!  
  DDX_Control(pDX, IDC_KEY, m_Key); #i)h0ML/e  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); :,GsbNKW  
  DDX_Check(pDX, IDC_ALT, m_bAlt); nM R _ ?g  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); !aLByMA  
  DDX_Text(pDX, IDC_PATH, m_Path); \ZCc~muR  
  DDX_Text(pDX, IDC_NUMBER, m_Number); +k8><_vr}  
 //}}AFX_DATA_MAP 9;h 1;9sC|  
} |$bZO`^  
T3M 4r|  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ;9u6]%hQTX  
//{{AFX_MSG_MAP(CCaptureDlg) ,:=E+sS  
 ON_WM_SYSCOMMAND() .0\Wu+  
 ON_WM_PAINT() D }b+#G(m[  
 ON_WM_QUERYDRAGICON() BMFpkK9|  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 9W'#4  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) < >f12pu  
 ON_BN_CLICKED(ID_CHANGE, OnChange) y1k""75  
//}}AFX_MSG_MAP ?*}V>h 8m)  
END_MESSAGE_MAP() F\Tlpp9  
#c?\(qjWA  
BOOL CCaptureDlg::OnInitDialog() +=O8t0y n  
{ "%>/rh2Iq  
 CDialog::OnInitDialog(); 8i X?4qj{P  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); `$MO.K{  
 ASSERT(IDM_ABOUTBOX < 0xF000); {#Gr=iv~N  
 CMenu* pSysMenu = GetSystemMenu(FALSE); n:k~\-&WJ  
 if (pSysMenu != NULL) W P.6ea7k  
 { :2?i9F0_  
  CString strAboutMenu; wPqIy}-  
  strAboutMenu.LoadString(IDS_ABOUTBOX); B;7L:  
  if (!strAboutMenu.IsEmpty()) {u9VHAXCf  
  { !7 *X{D v  
   pSysMenu->AppendMenu(MF_SEPARATOR); NUx%zY  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); o{zo-:>Jp  
  } M-|4cd]6  
 } sfVtYIu  
 SetIcon(m_hIcon, TRUE); // Set big icon LvW9kL+WiQ  
 SetIcon(m_hIcon, FALSE); // Set small icon S=M$g#X`5  
 m_Key.SetCurSel(0); $ n 7dIE  
 RegisterHotkey(); ;QgJw2G  
 CMenu* pMenu=GetSystemMenu(FALSE); nC[L"%E|se  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); zL)m!:_  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); w_\niqm<y  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Z8nNZ<k  
 return TRUE; // return TRUE unless you set the focus to a control LD^V="d  
} ^5"s3Qn  
W@pVP4F0xM  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 2/>AmVM  
{ ,v)@&1Wh:  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 4b6$Mj  
 { (*"R"Y  
  CAboutDlg dlgAbout; &?YQVwsN  
  dlgAbout.DoModal(); -Ux/ Ug@  
 } f4X?\eGT  
 else })T_D\2M  
 { v*]|1q%/  
  CDialog::OnSysCommand(nID, lParam); 5=Gq d4&*  
 } =@{H7z(p&  
} W13$-hf9  
&t%ICz&3  
void CCaptureDlg::OnPaint() |\N[EM%.@  
{ .c~;/@{  
 if (IsIconic()) 5O*. qp?  
 { BnAia3z  
  CPaintDC dc(this); // device context for painting FV:{lC{h~  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); HOu<,9?>Q  
  // Center icon in client rectangle j: ]/AReOL  
  int cxIcon = GetSystemMetrics(SM_CXICON); yrkd#m  
  int cyIcon = GetSystemMetrics(SM_CYICON); zy5@K)  
  CRect rect; \{NeDv{A  
  GetClientRect(&rect); >JC.qjA  
  int x = (rect.Width() - cxIcon + 1) / 2; 3- LO  
  int y = (rect.Height() - cyIcon + 1) / 2; ~u}[VP  
  // Draw the icon JUwP<C[  
  dc.DrawIcon(x, y, m_hIcon); (lEWnf=2h  
 } 7{<t]wQq  
 else Y@#~8\_  
 { ,:;nq>;  
  CDialog::OnPaint(); VbA#D4;  
 } $@Hw DRP  
} ,'82;oP4  
rmWG9&coW  
HCURSOR CCaptureDlg::OnQueryDragIcon() B8[H><)o\y  
{ jC; XY!d6  
 return (HCURSOR) m_hIcon; (Rs<'1+>  
} \<;/)!Nmw  
ab3" ?.3m  
void CCaptureDlg::OnCancel() ScM2_k`D  
{ F"a,[i,[W  
 if(bTray) ?^,GaZ^V  
  DeleteIcon(); <}i\fJX6  
  CDialog::OnCancel(); /mqEc9sq,  
} SU H^]4>  
CEI#x~Oq  
void CCaptureDlg::OnAbout() 8kO|t!?:U  
{ b4,yLVi<T  
 CAboutDlg dlg; \N/T^,  
 dlg.DoModal(); 0/-[k  
} _0Wd m*  
-,zNFC:6g  
void CCaptureDlg::OnBrowse() q]'VVlP)  
{ Dr`A4LnqY  
 CString str; Yxi.A$g  
 BROWSEINFO bi; <0&];5 on  
 char name[MAX_PATH]; _K/h/!\n  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); @R`OAd y  
 bi.hwndOwner=GetSafeHwnd(); ?WUu@Z  
 bi.pszDisplayName=name; ]lm9D@HMC  
 bi.lpszTitle="Select folder"; I /> .P  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; |@V<}2zCZ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); c$ 1ez  
 if(idl==NULL) &8~U&g6C  
  return; *:GoS?Ma  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); {e>}.R  
 str.ReleaseBuffer(); }ZR3  
 m_Path=str; .,tf[w 71  
 if(str.GetAt(str.GetLength()-1)!='\\') _gw~A {O  
  m_Path+="\\"; =BNmuAY7  
 UpdateData(FALSE); .5_w^4`b  
} `?`\!uP"  
~e'FPVDn  
void CCaptureDlg::SaveBmp() Xj|j\2$ 0  
{ 0 ,Bd,<3  
 CDC dc; Nu|?s-   
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 9> [ $;>  
 CBitmap bm; MUVp8! *@  
 int Width=GetSystemMetrics(SM_CXSCREEN); <qv:7@  
 int Height=GetSystemMetrics(SM_CYSCREEN); M62V NYt  
 bm.CreateCompatibleBitmap(&dc,Width,Height); IsnC_"f  
 CDC tdc; vW YN?"d  
 tdc.CreateCompatibleDC(&dc); dHd{9ftyF  
 CBitmap*pOld=tdc.SelectObject(&bm); 1.jW^sM  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ?XW+&!ar  
 tdc.SelectObject(pOld); s)&"g a  
 BITMAP btm; +| Cvv]Tx1  
 bm.GetBitmap(&btm); [+ 1([#  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; )mp0k%  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); VYlg+MlT0  
 BITMAPINFOHEADER bih; &5C%5C~ch  
 bih.biBitCount=btm.bmBitsPixel; g[:5@fI#*  
 bih.biClrImportant=0; .B>|>W O  
 bih.biClrUsed=0; l3(k  
 bih.biCompression=0; /AW6XyMD _  
 bih.biHeight=btm.bmHeight; }7Pd\tG]  
 bih.biPlanes=1; ( 3=.3[  
 bih.biSize=sizeof(BITMAPINFOHEADER); [wIyW/+  
 bih.biSizeImage=size; #YhKAG@|  
 bih.biWidth=btm.bmWidth; Z#^2F8,]  
 bih.biXPelsPerMeter=0; &/Tx@j^.C  
 bih.biYPelsPerMeter=0; I"Y?vj9]  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 31J7# S2  
 static int filecount=0; -XD\,y%zi  
 CString name; RI-whA8+  
 name.Format("pict%04d.bmp",filecount++); o$Hc5W([Z  
 name=m_Path+name; DHm$gk  
 BITMAPFILEHEADER bfh; v)rN] b]  
 bfh.bfReserved1=bfh.bfReserved2=0; +h*&r ~T  
 bfh.bfType=((WORD)('M'<< 8)|'B'); RC\TPG/8!  
 bfh.bfSize=54+size; kD"dZQx  
 bfh.bfOffBits=54; wBCnP  
 CFile bf; f)N67z6  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @CWfhc-Ub  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 'pZ~3q  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ~hP[[?  
  bf.WriteHuge(lpData,size); <}.)kg${O  
  bf.Close(); dk;Ed  
  nCount++; ?CM,k0  
 } Tcr&{S&o  
 GlobalFreePtr(lpData); j+Wgjf  
 if(nCount==1) 6 U# C  
  m_Number.Format("%d picture captured.",nCount); ;?%2dv2d  
 else *1%=?:$(r6  
  m_Number.Format("%d pictures captured.",nCount); ,CwhpW\Y  
  UpdateData(FALSE); ;2%3~L8?V  
} [y>Q3UqN  
/rJvw   
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 9.PY49|  
{ ;41s&~eR  
 if(pMsg -> message == WM_KEYDOWN) mQ' ]0DS  
 { rPr#V1}1a  
  if(pMsg -> wParam == VK_ESCAPE) rA{h/T"  
   return TRUE; _czLKbcF  
  if(pMsg -> wParam == VK_RETURN) m0/J3  
   return TRUE; EYG&~a>L*  
 } y$\K@B4  
 return CDialog::PreTranslateMessage(pMsg); 7B+?1E(  
} h :NHReMT  
A+ Z3b:}~  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $W` &7  
{ :GGsQ n  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ K\n %&w  
  SaveBmp(); $m{\<A  
  return FALSE; Wpj.G  
} nc@ul')  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ x-Xb4?{  
 CMenu pop; 6^|bKoN/ f  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); d5sG t#   
 CMenu*pMenu=pop.GetSubMenu(0); 9YB~1 M  
 pMenu->SetDefaultItem(ID_EXITICON); \^':(Gu4o  
 CPoint pt; 7+=j]+O  
 GetCursorPos(&pt); MS,H12h  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); bYG}CO  
 if(id==ID_EXITICON) L\hPw{)  
  DeleteIcon(); `1pri0!  
 else if(id==ID_EXIT) )?Jj#HtW  
  OnCancel(); 1~Pht:,t  
 return FALSE; REFisH-  
} ls #O0  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); '[Nu;(>a  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) .%~ L  
 AddIcon(); dbnH#0i  
 return res; <8-I:o]mF  
} 9x{T"'  
15nc  
void CCaptureDlg::AddIcon() qxd{c8  
{ ^_2Ki   
 NOTIFYICONDATA data; NW!e@;E+i  
 data.cbSize=sizeof(NOTIFYICONDATA); Km\M /j|  
 CString tip; !M3IuDN  
 tip.LoadString(IDS_ICONTIP); :!{aey  
 data.hIcon=GetIcon(0); uiHlaMf  
 data.hWnd=GetSafeHwnd(); `EWeJ(4Z@  
 strcpy(data.szTip,tip); )Tb{O  
 data.uCallbackMessage=IDM_SHELL; 4p %`Lv  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; S7N54X2JwL  
 data.uID=98; @,zBZNX y  
 Shell_NotifyIcon(NIM_ADD,&data); $o]suF;3  
 ShowWindow(SW_HIDE); EXb{/4  
 bTray=TRUE; %y8w9aGt  
} rr9HC]63  
G)b]uX  
void CCaptureDlg::DeleteIcon() 8|yhe%-O  
{ T5Pc2R  
 NOTIFYICONDATA data; ?&/9b)cS  
 data.cbSize=sizeof(NOTIFYICONDATA); aY3kww`  
 data.hWnd=GetSafeHwnd(); 9f BD.9A  
 data.uID=98; {L<t6A  
 Shell_NotifyIcon(NIM_DELETE,&data); #1m!,tC  
 ShowWindow(SW_SHOW); ?]5wX2G^|J  
 SetForegroundWindow(); /0@}7+&  
 ShowWindow(SW_SHOWNORMAL); q+ )KY  
 bTray=FALSE; ,QG,tf?  
} Z/Mp=273  
Za=<euc7  
void CCaptureDlg::OnChange() :Z1_;`>CT  
{ yd>kJk^~/  
 RegisterHotkey(); Z\dILt:#z  
} lzm9ClkfH  
b\^Sz{  
BOOL CCaptureDlg::RegisterHotkey() )OjbmU!7  
{ UDp"+nS  
 UpdateData(); K8e>sU.  
 UCHAR mask=0; |wK)(s  
 UCHAR key=0; cH2 nG:H  
 if(m_bControl) TR ]lP<m  
  mask|=4; {9C(\i +  
 if(m_bAlt) c}rRNS$F  
  mask|=2; I -;JDC?  
 if(m_bShift) ;5 IS58L  
  mask|=1; /B}]{bcp$  
  key=Key_Table[m_Key.GetCurSel()]; QW~o+N~~  
 if(bRegistered){ gs0,-)  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Z39^nGO  
  bRegistered=FALSE; FIG5]u  
 } X}p4yR7'  
 cMask=mask; P#Eqe O  
 cKey=key; 6EPC$*Xp!  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ]=]'*Z%  
 return bRegistered; eeL%Yp3+  
} S6]D;c8GE  
?w<x_Lo  
  四、小结 ]~a!O  
egP3q5~  
  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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