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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: Vy% :\p+  
  N;x<| %peL  
  一、实现方法 I)XOAf$6  
;]&~D +XH  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: bQdSX8: !R  
5Q$r@&qp  
#pragma data_seg("shareddata") KM6N'x^z  
HHOOK hHook =NULL; //钩子句柄 dm,}Nbc91(  
UINT nHookCount =0; //挂接的程序数目 @ k+%y'Y?  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 q M_/  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ne"?90~  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey x!C8?K =|  
static int KeyCount =0;  M<Wn]}7!  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 .@i0U  
#pragma data_seg() ]~prR?  
Y%fVt|  
  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。 1qLl^DW  
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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: z#{ 0;t  
$h 08Z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Gin_E&%g  
cKey,UCHAR cMask) q[)q|R|  
{ ]|,q|c,  
 BOOL bAdded=FALSE; 5 PGlR!^  
 for(int index=0;index<MAX_KEY;index++){ dSe8vA!)  
  if(hCallWnd[index]==0){ b.R!2]T]i^  
   hCallWnd[index]=hWnd; kqKj7L  
   HotKey[index]=cKey; `dv}a-Q)c  
   HotKeyMask[index]=cMask; /ojO>Y[<   
   bAdded=TRUE; Sa;<B:|  
   KeyCount++; t;.^K\S4  
   break; xS;|j j9  
  } K\IYx|Hm a  
 } &Y54QE".  
 return bAdded; 0%xR<<gir  
} 3XeXzPj  
//删除热键 9;0V  /y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) KE/-VjZu  
{ ?$|uT  
 BOOL bRemoved=FALSE; W\@?e32  
 for(int index=0;index<MAX_KEY;index++){ 9Z,*h-o  
  if(hCallWnd[index]==hWnd){ {W5ydHXy  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ bJQ5- *F  
    hCallWnd[index]=NULL; aho'|%y)  
    HotKey[index]=0; cOSxg=~>u  
    HotKeyMask[index]=0; eyeNrk*2o  
    bRemoved=TRUE; `z|= ~  
    KeyCount--; pk-yj~F}  
    break; r}/yi  
   } ;wij}y-6  
  } 2;r]gT~  
 } \{c,,th  
 return bRemoved; _tWJXv~;  
} nG"tO'J6  
@+'c+  
k}-yOP{  
  DLL中的钩子函数如下: :/C ?FHs9  
;^R A!Nj  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) .:}.b"%m  
{ #ZG3|#Q=L  
 BOOL bProcessed=FALSE; <y@,3DD3A9  
 if(HC_ACTION==nCode) p91`<>Iw  
 { |@ikx{W  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 V bg10pV0  
   switch(wParam) }3v'Cp0L  
   {  $ A-+E\vQ@  
    case VK_MENU: JDLTOLG  
     MaskBits&=~ALTBIT; &w+;N5}3  
     break; slU  
    case VK_CONTROL: 51I|0 ly  
     MaskBits&=~CTRLBIT; W8w3~  
     break; 01U *_\  
    case VK_SHIFT: bTZ>@~$  
     MaskBits&=~SHIFTBIT; j?EskT6  
     break; h ?uqLsRl  
    default: //judge the key and send message 06 QU  
     break; 5Z/yhF.{  
   } 5]jx5!N  
   for(int index=0;index<MAX_KEY;index++){ M]}l^ m>L  
    if(hCallWnd[index]==NULL) 2Y400  
     continue; >(hSW~i~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N>+P WE$  
    { S8 :"<B)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); &J8 Z@^  
     bProcessed=TRUE; hf;S]8|F  
    } Q*]$)D3n  
   } QL2Nz@|k  
  } !Citzor  
  else if((lParam&0xc000ffff)==1){ //有键按下 sU\c#|BSC"  
   switch(wParam) \[:PykS  
   { rkkU"l$v  
    case VK_MENU: $tI]rU  
     MaskBits|=ALTBIT; j5PL{6  
     break; )h#]iGVN}  
    case VK_CONTROL: [+;qWfs B  
     MaskBits|=CTRLBIT; ~A6"sb=  
     break; Rj^7#,993  
    case VK_SHIFT: p8Iw!HE  
     MaskBits|=SHIFTBIT; >*IN  
     break; ^$!987"  
    default: //judge the key and send message _2b9QP p  
     break; #?dUv#  
   } $[g_=Z  
   for(int index=0;index<MAX_KEY;index++){ F!J J6d53y  
    if(hCallWnd[index]==NULL) "< v\M85&  
     continue; \#CM <%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) } ^i b  
    { 98fu>>*G{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); j Fma|y  
     bProcessed=TRUE; RPVT*`o  
    } Ow3P-UzU3  
   } bLqy!QE  
  } $J.T$0pFa  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 2edBQYWd  
   for(int index=0;index<MAX_KEY;index++){ ZsZcQj6G,  
    if(hCallWnd[index]==NULL) Jic}+X*0  
     continue; Q.+|xwz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [|[>}z:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); +Ng0WS_0  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 HG%Z "d  
   } ubYG  
  } *#y;8  
 } M"{uX  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *f5l=lDOB  
} w%dL 8k  
WA$ JI@g  
  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: BByCM Y  
#`;/KNp 9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ""{|3XJe  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); cu&,J#r%  
RKZ6}q1n  
  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: W2Luz;(U  
{f/]5x(_  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) WKmbNvN^  
{ Xl_Uz8Hp  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) DNkWOY#{  
 { TZRcd~5$  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 vyI%3+N@  
  SaveBmp(); 3=  -pG  
  return FALSE; M+`H g_#Q  
 } O7t(,uox3y  
 …… //其它处理及默认处理 w$|l{VI  
} FP^{=0  
Z5(enTy-  
6rN(_Oi-  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 !@A#=(4R4  
2; `=P5V  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 /mM2M-  
ILwn&[A0  
  二、编程步骤 ,#]t$mzbQ(  
Oco YV J  
  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"; Avlz=k1*  
Xz 4 x  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ,`A?!.K$  
B>y9fI  
  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; sJ z@7.  
L,,*gK  
  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; ULH0'@BJ  
CjIu[S1%  
  5、 添加代码,编译运行程序。 MZJ]Dwt]  
VOTv?Vf  
三、程序代码 WQNE2Q  
f:B>zp;N  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL _c$9eAe  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)  '1^B +m  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ X^9d/}uTa  
#if _MSC_VER > 1000 fq[;%cr4  
#pragma once +>~?m*$  
#endif // _MSC_VER > 1000 YW \0k5[  
#ifndef __AFXWIN_H__ R%D'`*+  
#error include 'stdafx.h' before including this file for PCH U$dh1;  
#endif h].~#*  
#include "resource.h" // main symbols COzyG.R.  
class CHookApp : public CWinApp `(6r3f~XJ  
{ G rmzkNlN  
 public: kql0J|P?  
  CHookApp(); YXurYwV  
  // Overrides Em 6Qe  
  // ClassWizard generated virtual function overrides bI)u/  
  //{{AFX_VIRTUAL(CHookApp) r7]zQIE  
 public: c#IYFTz  
  virtual BOOL InitInstance(); b1XRC`Gy  
  virtual int ExitInstance(); r|e-<t4.9L  
  //}}AFX_VIRTUAL D]a<4a 18  
  //{{AFX_MSG(CHookApp) !\8  ;d8  
  // NOTE - the ClassWizard will add and remove member functions here. *=V7@o  
  // DO NOT EDIT what you see in these blocks of generated code ! D?yG+%&9  
  //}}AFX_MSG !+)AeDc:j  
  DECLARE_MESSAGE_MAP() G$0c '9d*(  
}; bwM@/g%DL  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); !o=U19)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^EG\iO2X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'I;!pUfVp  
BOOL InitHotkey(); Ghl'nqPlm  
BOOL UnInit(); n+lOb  
#endif \)K^=jM  
@_:]J1jw7  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Uw,2}yR  
#include "stdafx.h" @';B_iQ  
#include "hook.h" dVB~Smsr  
#include <windowsx.h> wn_b[tdxq  
#ifdef _DEBUG ydw)mT44K  
#define new DEBUG_NEW 9% l%  
#undef THIS_FILE ae:zWk'!  
static char THIS_FILE[] = __FILE__; 7\*FEjRM]  
#endif )X9W y!w0  
#define MAX_KEY 100 s&\I=J.  
#define CTRLBIT 0x04 |-V&O=!^+  
#define ALTBIT 0x02 &Tl 0Pf  
#define SHIFTBIT 0x01 O6IB. >T  
#pragma data_seg("shareddata") '* \|; l#1  
HHOOK hHook =NULL; *@d&5  
UINT nHookCount =0; Y"OG@1V;8  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey kP/M< X"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT /mp*>sNr6  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey %tG*C,l]  
static int KeyCount =0; b~nAPY6  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift @+atBmt  
#pragma data_seg() dt2$`X18  
HINSTANCE hins; BD`2l!d  
void VerifyWindow(); "M|zv  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) `,P h/oM  
//{{AFX_MSG_MAP(CHookApp) 5|jw^s7  
// NOTE - the ClassWizard will add and remove mapping macros here. [HCAmnb  
// DO NOT EDIT what you see in these blocks of generated code! UI>Y0O  
//}}AFX_MSG_MAP 6oF7:lt  
END_MESSAGE_MAP() oh$Q6G  
;j4?>3  
CHookApp::CHookApp() ?_I[,N?@41  
{ ^h{)Gf,+\  
 // TODO: add construction code here, Bdj%hyW  
 // Place all significant initialization in InitInstance i\W/C  
} Qx[t /~  
%;.;>Y(-  
CHookApp theApp; J/}:x;Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /="~gq@  
{ [,TkFbDq"J  
 BOOL bProcessed=FALSE; 2 !'A:;  
 if(HC_ACTION==nCode) dDF .qXq.  
 { C`5  
  if((lParam&0xc0000000)==0xc0000000){// Key up EY \H=@A  
   switch(wParam) H<^/Ati,|  
   { f%V4pzOc"  
    case VK_MENU: n5{Xj:}  
     MaskBits&=~ALTBIT; 6P';DB  
     break; kYLM&&h  
    case VK_CONTROL: TC<@e<-%Sq  
     MaskBits&=~CTRLBIT; gB<3-J1R  
     break; &LbJT$}V  
    case VK_SHIFT: E8-P"`Qba  
     MaskBits&=~SHIFTBIT; .jj$Kh q]  
     break; ;&ASkI  
    default: //judge the key and send message yrR1[aT  
     break; .-<k>9S7_  
   } ~q~MoN<R  
   for(int index=0;index<MAX_KEY;index++){ Kw#i),M  
    if(hCallWnd[index]==NULL) ]8T!qS(UJd  
     continue; {c (!;U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *W kIq>  
    { ,u/aT5\_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); rta:f800z  
     bProcessed=TRUE; '{(UW.Awo  
    } u?+Kkkk  
   } 9k6r_G"  
  } .j-IX1Sa  
  else if((lParam&0xc000ffff)==1){ //Key down SI=yI-  
   switch(wParam) f/V 2f].  
   { J.8IwN1E  
    case VK_MENU: >$ e9igwe  
     MaskBits|=ALTBIT; "70WUx(\t  
     break; m'f,_ \'  
    case VK_CONTROL: d20gf:@BM  
     MaskBits|=CTRLBIT; R~ZFy0  
     break; kSDZZx  
    case VK_SHIFT: qs QNjt  
     MaskBits|=SHIFTBIT; |M+<m">E  
     break; n-%s8aaVf  
    default: //judge the key and send message g]c6& Y,#  
     break; rf$X>M=G  
   } %wSj%>&-R  
   for(int index=0;index<MAX_KEY;index++) BN4_:  
   { B:+6~&,-  
    if(hCallWnd[index]==NULL) [AW" D3  
     continue; ;dzL}@we  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) WAS U0  
    { vo#UtN:q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /IM#.v  
     bProcessed=TRUE; Uk,g JR  
    } A.5i"Ci[ie  
   } wGZR31  
  } QzAK##9bfa  
  if(!bProcessed){ R+7oRXsu  
   for(int index=0;index<MAX_KEY;index++){ po}F6m8bX  
    if(hCallWnd[index]==NULL) C*G=cs\i  
     continue; -<_Ww\%8M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %~QO8q_7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .m`y><.5  
   } "jaJr5Wv=y  
  } \fjMc }'  
 } JO@|*/mL  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )nd\7|5#  
} h?$T!D>  
~I(Hc.Q  
BOOL InitHotkey() ZlojbL@|4  
{ 8L1ohj  
 if(hHook!=NULL){  ]@M5&  
  nHookCount++;  PTS]7  
  return TRUE; aBzszp]l+  
 } >g;kJe  
 else Y+3!f#exm  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); tM#lFmdd\P  
  if(hHook!=NULL) v<9&B94z  
   nHookCount++; >dM8aJzC  
  return (hHook!=NULL); =-o'gL  
} !(t,FYeH  
BOOL UnInit() .{S8f#p9T  
{ :ah 5`nmPO  
 if(nHookCount>1){ SI6B#u-i  
  nHookCount--; z7-k`(l4  
  return TRUE; _qWliw:0#  
 } +B|7p9qy  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 9*:gr#(5  
 if(unhooked==TRUE){ RJeSi`19T)  
  nHookCount=0; <A.W 8b7D  
  hHook=NULL; ^W7X(LQ*+  
 } s[Ur~Wvn  
 return unhooked; \sA*V%n  
} &Z^ l=YH,  
pZZf[p^s|  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) T%Pp*1/m7  
{ 5TUNX^AW  
 BOOL bAdded=FALSE; gip/(/NX  
 for(int index=0;index<MAX_KEY;index++){ 9,]5v +  
  if(hCallWnd[index]==0){ ?U7) XvQ  
   hCallWnd[index]=hWnd; ,pBh`av  
   HotKey[index]=cKey; fj,m  
   HotKeyMask[index]=cMask; ai*b:Q  
   bAdded=TRUE; X _$a,"'~)  
   KeyCount++; jtm?z c  
   break; ueG|*[  
  } +([!A6:  
 } 19q{6X`x  
 return bAdded; j 6ut}Uq  
} A`6ra}U<  
@$eT~ C  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,LOQDIyn  
{ 5y4u5Tm-%  
 BOOL bRemoved=FALSE; H0"=Vs,n  
 for(int index=0;index<MAX_KEY;index++){ 9tg)Mo%  
  if(hCallWnd[index]==hWnd){ N{d@^Yj  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ uENdI2EY8y  
    hCallWnd[index]=NULL; %}>dqUyQ  
    HotKey[index]=0; P6U%=xaC  
    HotKeyMask[index]=0; W2wpcc  
    bRemoved=TRUE; )$x_!=@1  
    KeyCount--; k6\^p;!Y  
    break; ;\%sEcpT  
   } h?,\(KjP#  
  } f*xpE`&  
 } 3,aN8F1;C  
 return bRemoved; I]}>|  
} 'q%%m/,VPQ  
EqM;LgE=  
void VerifyWindow() 8rbG*6  
{ gd^Js 1Z  
 for(int i=0;i<MAX_KEY;i++){ .+K S`  
  if(hCallWnd!=NULL){ }{],GHCjQ  
   if(!IsWindow(hCallWnd)){ t0m*PJcF  
    hCallWnd=NULL; %3Bpn=k>  
    HotKey=0; R21~Q:b !  
    HotKeyMask=0; :]eb<J  
    KeyCount--; X,v4d~>]  
   } +3^NaY`Y  
  } [B6DC`M  
 } 0-2"FdeQU  
} ^abD !8  
Ttv9" z  
BOOL CHookApp::InitInstance() S]2 {ZDP  
{ [6g O  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); CB*/ =Y  
 hins=AfxGetInstanceHandle(); RazBc.o<  
 InitHotkey(); Q;26V4  
 return CWinApp::InitInstance(); Rrqg[F+  
} m4/}Jx[  
T{S4|G1R6  
int CHookApp::ExitInstance() ]h~o],:  
{ uu}-"/<~7  
 VerifyWindow(); k90B!kg  
 UnInit(); g"y?nF.&F  
 return CWinApp::ExitInstance(); 3ps,uozj  
} A4_>LO_qL  
lfy7w|  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file SFO&=P:U  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) x N`T  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ l \}25 e  
#if _MSC_VER > 1000 Bxv8RB  
#pragma once ="B n=>  
#endif // _MSC_VER > 1000 W/v|8-gcK  
"T*I|  
class CCaptureDlg : public CDialog 97x%w]kV  
{ ?'2 v.5TQt  
 // Construction ahp1!=Z-=  
 public: /J;]u3e|  
  BOOL bTray; v>at/ef  
  BOOL bRegistered; *g$agyOfh  
  BOOL RegisterHotkey(); BE%Z\E[[m  
  UCHAR cKey; S OI)/u  
  UCHAR cMask; X,Zd=  
  void DeleteIcon(); |#cAsf_{  
  void AddIcon(); (rMZ  
  UINT nCount; a4u^f5)@  
  void SaveBmp(); #PH#2/[  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor T?e9eYwS  
  // Dialog Data bm6hZA|  
  //{{AFX_DATA(CCaptureDlg) f+^c@0que  
  enum { IDD = IDD_CAPTURE_DIALOG }; .Qk{5=l6P  
  CComboBox m_Key; 5Jw"{V?Ak  
  BOOL m_bControl; acP ;(t  
  BOOL m_bAlt; !VNbj\Bp  
  BOOL m_bShift; gA:[3J,[;  
  CString m_Path; >D3z V.R  
  CString m_Number; D1! {S7  
  //}}AFX_DATA 4ac1m,Jlt  
  // ClassWizard generated virtual function overrides q]+)c2M  
  //{{AFX_VIRTUAL(CCaptureDlg) 9,KVBO  
 public: L"9 Gc  
  virtual BOOL PreTranslateMessage(MSG* pMsg); W60Q3  
 protected: *G9 [j$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support RSFJu\0}N  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Q_v\1"c  
  //}}AFX_VIRTUAL !`Xt8q\r  
  // Implementation ?d#Lr*m  
 protected: w. vY(s  
  HICON m_hIcon; #a.\P.{L  
  // Generated message map functions -P*xyI  
  //{{AFX_MSG(CCaptureDlg) Jtpa@!M  
  virtual BOOL OnInitDialog(); rQ &S<  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 5(KG=EHj_  
  afx_msg void OnPaint(); b_ypsGE]5!  
  afx_msg HCURSOR OnQueryDragIcon(); G+fd.~aGE  
  virtual void OnCancel(); a2[ 8wv1  
  afx_msg void OnAbout(); $u&|[vcP0  
  afx_msg void OnBrowse(); N]V/83_  
  afx_msg void OnChange(); yIlV[_  
 //}}AFX_MSG v<%]XHN  
 DECLARE_MESSAGE_MAP() z?I+u* rF6  
}; df!+T0  
#endif CN-4-  
u1wg C#  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 4VC/-.At  
#include "stdafx.h" #!wsD7;  
#include "Capture.h" !W 0P `i<  
#include "CaptureDlg.h" }z8{B3K  
#include <windowsx.h> dEL3?-;'  
#pragma comment(lib,"hook.lib") NYGmLbq  
#ifdef _DEBUG `B:B7Cpvn  
#define new DEBUG_NEW $+0=GN  
#undef THIS_FILE 2\DTJ`Y,  
static char THIS_FILE[] = __FILE__; zUNH8=U  
#endif 4,gol?a  
#define IDM_SHELL WM_USER+1 ZK%Kgk[\:~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); q^)=F_QvG  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]sf2"~v  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; fFjLp l  
class CAboutDlg : public CDialog _E3U.mV  
{ Ng?apaIi@~  
 public: a$~IQ2$|6  
  CAboutDlg(); hEVjeC  
  // Dialog Data ]d[Rf$>vu0  
  //{{AFX_DATA(CAboutDlg) Czq1 kz  
  enum { IDD = IDD_ABOUTBOX }; (zjz]@qJ  
  //}}AFX_DATA PbbXi  
  // ClassWizard generated virtual function overrides aytq4Ts  
  //{{AFX_VIRTUAL(CAboutDlg) X\o/i\ C}  
 protected: NG!>7$@RV  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support A*G )CG  
  //}}AFX_VIRTUAL eo>/  
  // Implementation (y-x01H  
 protected: 'bZMh9|  
  //{{AFX_MSG(CAboutDlg) fG X1y  
  //}}AFX_MSG ;% /6Y~/  
  DECLARE_MESSAGE_MAP() c-[Q,c  
}; 9`)w@-~~  
<QYCo1_  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) N$N;Sw  
{ JZs|~@  
 //{{AFX_DATA_INIT(CAboutDlg) pe\Txg6  
 //}}AFX_DATA_INIT 8#X?k/mzU  
} 6(ka"Vu~  
d9`3EP)n  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) H.jLGe>  
{ ?2J S&i  
 CDialog::DoDataExchange(pDX); #)W8.  
 //{{AFX_DATA_MAP(CAboutDlg) Kj~>&WU  
 //}}AFX_DATA_MAP \e`6=Q%  
} Nm H}"ndv+  
hEyX~f  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) p_rN1W Dd'  
 //{{AFX_MSG_MAP(CAboutDlg) 2(+RIu0d  
 // No message handlers :6 Hxxh  
 //}}AFX_MSG_MAP ;J,,f1Vw  
END_MESSAGE_MAP() 7bgnZ]r8t  
1?/5A|?V4+  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) n;-x!Gs  
: CDialog(CCaptureDlg::IDD, pParent) j\XX:uU_  
{ "o\6k"_c>  
 //{{AFX_DATA_INIT(CCaptureDlg) F'V +2,.  
  m_bControl = FALSE; 0C7thl{Dms  
  m_bAlt = FALSE; W _PM!>8`  
  m_bShift = FALSE; (hhdbf  
  m_Path = _T("c:\\"); #U?EOm  
  m_Number = _T("0 picture captured."); xm<5S;E5U4  
  nCount=0; O4 +SD  
  bRegistered=FALSE; kr/1Dsr4  
  bTray=FALSE; C$N4   
 //}}AFX_DATA_INIT A^T~@AO  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ,xAM[h&  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); DuTlYXM2^  
} RT.wTJS;  
9J-!o]f .b  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) _|^&eT-u  
{ .LeF|EQU\@  
 CDialog::DoDataExchange(pDX); ;55tf l  
 //{{AFX_DATA_MAP(CCaptureDlg) .d#G]8suF  
  DDX_Control(pDX, IDC_KEY, m_Key); 6nY )D6$JG  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ^Ff~j&L@{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); buq *abON  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); aIzp\$NWVK  
  DDX_Text(pDX, IDC_PATH, m_Path); Lyf? V(S  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ;qMnO_ E  
 //}}AFX_DATA_MAP h-?q6O/|  
} ;y?D1o^r8W  
Ovaj":L  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) r|JiGj^om  
//{{AFX_MSG_MAP(CCaptureDlg) c{]r{FAx9o  
 ON_WM_SYSCOMMAND() l ))~&  
 ON_WM_PAINT() NE=#5?6%g7  
 ON_WM_QUERYDRAGICON() wB1|r{  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) i#M a -0#  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) )"pxry4v7J  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ])$. "g  
//}}AFX_MSG_MAP rHC+nou  
END_MESSAGE_MAP() uDy>xJ|  
3IJI5K_  
BOOL CCaptureDlg::OnInitDialog() Dj,+t+|  
{ iS:PRa1  
 CDialog::OnInitDialog(); G+ $)W u  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); @??c<]9F  
 ASSERT(IDM_ABOUTBOX < 0xF000); {d?4;Kd  
 CMenu* pSysMenu = GetSystemMenu(FALSE); n&3iv ^  
 if (pSysMenu != NULL) fo!Lp*'0  
 { !q=Q~ea  
  CString strAboutMenu; ,/w852|ub  
  strAboutMenu.LoadString(IDS_ABOUTBOX); +>i<sk  
  if (!strAboutMenu.IsEmpty()) 7fN&Q~.  
  { >DL-Q\U  
   pSysMenu->AppendMenu(MF_SEPARATOR); (Qh7bfd  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); v'bd.eqw  
  } 0ez i?Um  
 } @KXz4PU  
 SetIcon(m_hIcon, TRUE); // Set big icon Vhbj.eX.)  
 SetIcon(m_hIcon, FALSE); // Set small icon SqA+u/"j2  
 m_Key.SetCurSel(0); qV,$bw  
 RegisterHotkey(); _#^A:a^e8  
 CMenu* pMenu=GetSystemMenu(FALSE); T^(n+lv  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); k^dCX+  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); d4/`:?w  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \@PUljU]  
 return TRUE; // return TRUE unless you set the focus to a control Q:fUM[  
} wzQdKlV  
'Qs 3  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 0LHiOav  
{ Og;$P 'U  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) X_tW#`  
 { IYM@(c@ld0  
  CAboutDlg dlgAbout; m)[wZP*e  
  dlgAbout.DoModal(); A^r [_dyZ  
 } 8|jX ~f  
 else Xv5Ev@T  
 { wkZ2Y-#='  
  CDialog::OnSysCommand(nID, lParam); 4G;`KqR@  
 } Bn#HJ17/#  
} xBI"{nGoN  
|Qt`p@W  
void CCaptureDlg::OnPaint() p3A-WK|NX  
{ $OFFH[_z  
 if (IsIconic()) %yuIXOJ  
 { sm&rR=b  
  CPaintDC dc(this); // device context for painting ^%*{:0'  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); %`T^qh_dE  
  // Center icon in client rectangle a+a%}76N  
  int cxIcon = GetSystemMetrics(SM_CXICON); ://|f  
  int cyIcon = GetSystemMetrics(SM_CYICON);  RoM*Qjw  
  CRect rect; aXK%m  
  GetClientRect(&rect); {}_Oo%IVGK  
  int x = (rect.Width() - cxIcon + 1) / 2; X8l1xD  
  int y = (rect.Height() - cyIcon + 1) / 2; >'1Q"$;  
  // Draw the icon l-h7ksRs  
  dc.DrawIcon(x, y, m_hIcon); bQN4ozSi  
 } NW>:Lz ?"  
 else @Kb|  
 { C^42=?  
  CDialog::OnPaint(); F=T.*-oS3  
 } Z%n.:I<%ZV  
} +q=jB-eIx  
?>\]%$5o  
HCURSOR CCaptureDlg::OnQueryDragIcon() o(SJuZC/U  
{ fm:{&(  
 return (HCURSOR) m_hIcon; a3 _0F@I  
} Xie dgy  
 { e  
void CCaptureDlg::OnCancel() +VW]%6 +  
{ [Z G j7  
 if(bTray) vls> 6h  
  DeleteIcon(); .-26 N6S  
  CDialog::OnCancel(); ~ V- o{IA  
} vAhO!5]>\  
b!HFv;^N  
void CCaptureDlg::OnAbout() 4aGpKvW  
{ dvWlx]'  
 CAboutDlg dlg; yhn $4;m  
 dlg.DoModal(); ,Y5 4(>>%  
} sF3 l##Wv  
,H(vD,54g  
void CCaptureDlg::OnBrowse() ]~M {@h!<  
{ L#@$Mtc  
 CString str; i&Cqw~.H  
 BROWSEINFO bi; lz0]p  
 char name[MAX_PATH]; z'K7J'(R  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); qq%_ksQ  
 bi.hwndOwner=GetSafeHwnd(); K:50?r_-6  
 bi.pszDisplayName=name; vlyNQ7"%  
 bi.lpszTitle="Select folder"; & ~G  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; W",jZ"7  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 00wH#_fm  
 if(idl==NULL) so&3A&4cL  
  return; ?iO^b.'I#  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); i1&noRGl  
 str.ReleaseBuffer(); kV%y%l(6  
 m_Path=str; 5P2FNUKL  
 if(str.GetAt(str.GetLength()-1)!='\\') +Ws}a  
  m_Path+="\\"; )4~XZt1r  
 UpdateData(FALSE); .z7f_KX^  
} RXvcy<  
F qyJ*W\1  
void CCaptureDlg::SaveBmp() u}0t`w:  
{ 2p.+C35c=j  
 CDC dc; -* j;  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); >Nqkz?67  
 CBitmap bm; *4\ub:9  
 int Width=GetSystemMetrics(SM_CXSCREEN); |8+rUFkU8  
 int Height=GetSystemMetrics(SM_CYSCREEN); jo:p*Q "F  
 bm.CreateCompatibleBitmap(&dc,Width,Height); md_s2d  
 CDC tdc; 1:V/['|*g)  
 tdc.CreateCompatibleDC(&dc); @d9*<>@:  
 CBitmap*pOld=tdc.SelectObject(&bm); iU|C<A%Hh  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); r|$g((g  
 tdc.SelectObject(pOld); L7="!I  
 BITMAP btm; ` u)V 9{  
 bm.GetBitmap(&btm); TK1M mL  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; O4URr  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); :{imRa-  
 BITMAPINFOHEADER bih; A[Xw|9  
 bih.biBitCount=btm.bmBitsPixel; h 'CLf]  
 bih.biClrImportant=0; z`6KX93  
 bih.biClrUsed=0; N#qoKY(#  
 bih.biCompression=0; wIPDeC4  
 bih.biHeight=btm.bmHeight; '7%9Sqx  
 bih.biPlanes=1; of<OOh%3  
 bih.biSize=sizeof(BITMAPINFOHEADER); 8;bOw  
 bih.biSizeImage=size; 4^A'A.0  
 bih.biWidth=btm.bmWidth; -#hl& ^u$  
 bih.biXPelsPerMeter=0; z#ET-[ I  
 bih.biYPelsPerMeter=0; #wcoLCjs)  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); {rr\hl-$  
 static int filecount=0; Ds$;{wl#x  
 CString name; =Ih_[$1dw  
 name.Format("pict%04d.bmp",filecount++); ENr&k(>0HQ  
 name=m_Path+name; ~Y$1OA8  
 BITMAPFILEHEADER bfh; QX/`s3N  
 bfh.bfReserved1=bfh.bfReserved2=0; Z H*?~ #  
 bfh.bfType=((WORD)('M'<< 8)|'B'); z5zm,Jw  
 bfh.bfSize=54+size; hy rJu{p  
 bfh.bfOffBits=54; 4+Kc  
 CFile bf; 0J B"@U&-  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #YV;Gp(2h  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ?z.`rD$}(n  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); EJsb{$u  
  bf.WriteHuge(lpData,size); 37DvI&  
  bf.Close(); /vU31_eZt  
  nCount++; ^|2qD: ;  
 } 0 $r{h}[^c  
 GlobalFreePtr(lpData); xFh}%mwpt[  
 if(nCount==1) f&J*(F*u  
  m_Number.Format("%d picture captured.",nCount); auU{I y   
 else Ea 1>]V  
  m_Number.Format("%d pictures captured.",nCount); UKdzJEhG  
  UpdateData(FALSE); 6{ Eh={:b  
} *HUqW}_r  
'>8N'*  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) iQQJ`  
{ [Pl$=[+  
 if(pMsg -> message == WM_KEYDOWN) ?M);wBe(  
 { *%.*vPJ  
  if(pMsg -> wParam == VK_ESCAPE) J=Z"sU=  
   return TRUE; hi%>&i*  
  if(pMsg -> wParam == VK_RETURN) 5Dd;?T>  
   return TRUE; a7ty&[\  
 } ~PHG5?X  
 return CDialog::PreTranslateMessage(pMsg); ">7 bnOJ  
} `CBTZG09  
ofV{SeD67  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #=2~MXa@z7  
{ 2P*O^-zRp  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ C.|MA(7  
  SaveBmp(); ;3_'{  
  return FALSE; .#SWfAb2h  
} =:lacK(0  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ tBt\&{=|D  
 CMenu pop; & |r)pl0$  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !nVuvsbv  
 CMenu*pMenu=pop.GetSubMenu(0); _XN sDW4|  
 pMenu->SetDefaultItem(ID_EXITICON); YI/vt2  
 CPoint pt;  zcc]5>  
 GetCursorPos(&pt); q0o6%c:gW  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); >dO^pDSs  
 if(id==ID_EXITICON) ;)*Drk*t,  
  DeleteIcon(); (,k=mF  
 else if(id==ID_EXIT) _F$?Z  
  OnCancel(); :'03*A_[  
 return FALSE; zc_3\N  
} d] {^  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Yd9y8Tq J  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) $K hc?v  
 AddIcon(); YRl2e`&jt  
 return res; "{}5uth  
} nX~sVG{Q  
z;LntQZp-  
void CCaptureDlg::AddIcon() }Q*8QV  
{ 0 @>3fR  
 NOTIFYICONDATA data; :)&_  
 data.cbSize=sizeof(NOTIFYICONDATA); *v6'I-#  
 CString tip; @f5X AK?  
 tip.LoadString(IDS_ICONTIP); @?z*: 7a  
 data.hIcon=GetIcon(0); r__uPyIMG/  
 data.hWnd=GetSafeHwnd(); {min9  
 strcpy(data.szTip,tip); N=(rl#<  
 data.uCallbackMessage=IDM_SHELL; KV Mm<]Z  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1L3L!@  
 data.uID=98; *@dqAr%  
 Shell_NotifyIcon(NIM_ADD,&data);  {sbQf7)  
 ShowWindow(SW_HIDE);  RszqDm  
 bTray=TRUE; Rv }e+5F  
} 6B&':N98  
0q81H./3  
void CCaptureDlg::DeleteIcon() e4t'3So  
{ Vg0Rc t  
 NOTIFYICONDATA data; A+AqlM+$i  
 data.cbSize=sizeof(NOTIFYICONDATA); 'z@(,5  
 data.hWnd=GetSafeHwnd(); ((#|>W\&  
 data.uID=98; v. !L:1@I.  
 Shell_NotifyIcon(NIM_DELETE,&data); Y*0mC"n}  
 ShowWindow(SW_SHOW); XK>B mq/]  
 SetForegroundWindow(); aqtQGK57"%  
 ShowWindow(SW_SHOWNORMAL); 074)(X&:x  
 bTray=FALSE;  RCKb5p9  
} +eQg+@u  
<a; <|Fm.  
void CCaptureDlg::OnChange() a=Pl3Uo  
{ S U04q+  
 RegisterHotkey(); xwq {0jY  
} !A qSG-  
+TL5yuA  
BOOL CCaptureDlg::RegisterHotkey() z^bv)u  
{ Xgou7x<  
 UpdateData(); eT0Yp  
 UCHAR mask=0; <'f+ nC=2  
 UCHAR key=0; 7M9Ey29f  
 if(m_bControl) 6B'd]Fe  
  mask|=4; 7,X5]U&A<x  
 if(m_bAlt) bLuAe EA  
  mask|=2; XnR9/t  
 if(m_bShift)  UDl[  
  mask|=1; CEzwI _  
  key=Key_Table[m_Key.GetCurSel()]; xvU@,bzz  
 if(bRegistered){ |L wn<y  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); d.>Zn?u4L  
  bRegistered=FALSE; 7XrXx:*a5  
 } ?QR13l(  
 cMask=mask; ^N# z&oh  
 cKey=key; Vh=10Et  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); X!6oviT|m  
 return bRegistered; 7 G37V"''  
} +9yV'd>U  
"0Ca;hSLM2  
  四、小结 H+lBb$  
6)5Akyz4V  
  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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