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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: d4gl V`%.  
  1jQz%^~  
  一、实现方法 XnV|{X%]U  
Hn:%(Rg=aW  
  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: pH)V:BmJ  
,7tN&R_  
#pragma data_seg("shareddata") |1;0q<Ka  
HHOOK hHook =NULL; //钩子句柄 dZv-lMYBE  
UINT nHookCount =0; //挂接的程序数目 6rdm=8WFA  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 }LQ&AIRN  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 .rax`@\8  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey \'j%q\Bl;  
static int KeyCount =0; 5AQ $xm4  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 'J+Vw9 s7  
#pragma data_seg() >m%\SuXq  
YdIV_&-W  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ?I7%@x!+S  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: `P"-9Ue=  
@;Yb6&I;  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR N'|zPFk g  
cKey,UCHAR cMask) G8eAj%88  
{ #jK{)%}mA  
 BOOL bAdded=FALSE; yQ6{-:`)  
 for(int index=0;index<MAX_KEY;index++){ GT2;o  
  if(hCallWnd[index]==0){ /zPN9 db  
   hCallWnd[index]=hWnd; C %y AMQ  
   HotKey[index]=cKey; Of Y>~d  
   HotKeyMask[index]=cMask; 6-<,1Q'D  
   bAdded=TRUE; Gz$DsaG  
   KeyCount++; eH79,!=2  
   break; T3!l{vG \O  
  } "l2_7ZXsPT  
 } Ow mI*`  
 return bAdded; @ttcFX1:W  
} ;k!bv|>n  
//删除热键 >:h 8T]F  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) rOH8W  
{ naM4X@jl  
 BOOL bRemoved=FALSE; +g\u=&< 6  
 for(int index=0;index<MAX_KEY;index++){ a+,)rY9  
  if(hCallWnd[index]==hWnd){ xlS t  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~ia#=|1}  
    hCallWnd[index]=NULL; 980[]&(  
    HotKey[index]=0; $UO7AHk  
    HotKeyMask[index]=0; - C8 h$P  
    bRemoved=TRUE; v"=^?5B  
    KeyCount--; lbTz  
    break; q'd6\G0 }  
   } 3fn6W)v?  
  } 's!EAqCN  
 } {v<Ig{{V  
 return bRemoved; aW$7:<A{  
} 19&!#z  
Dy0cA| E  
N2xgyKy~  
  DLL中的钩子函数如下: !9OAMHa*9  
6^}GXfJAc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) k h#|`E#,  
{ 9:4P7  
 BOOL bProcessed=FALSE; x1?p+  
 if(HC_ACTION==nCode) ?Tt/,Hl?D  
 { 2t/ba3Rfk  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 xlv:+  
   switch(wParam) A:& `oJl  
   {  lg;`ItX]  
    case VK_MENU: (Q\QZu@  
     MaskBits&=~ALTBIT; -9vAY+s.  
     break; HFvhrG  
    case VK_CONTROL: nEyP Nm )  
     MaskBits&=~CTRLBIT; D("['`{  
     break; FHqa|4Ie  
    case VK_SHIFT: '+Ts IJh  
     MaskBits&=~SHIFTBIT; pA"pt~6  
     break; rh/3N8[6  
    default: //judge the key and send message ,5H$Tm,6\S  
     break; ayHI(4!$j  
   } |]Pigi7y-  
   for(int index=0;index<MAX_KEY;index++){ #li;L  
    if(hCallWnd[index]==NULL) PBR+NHrZ  
     continue; H Viu7kue`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1K4LEg a`  
    { QWxCNt:^?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); E+UOuf*(  
     bProcessed=TRUE; k;l^wM  
    } &3S;5{7_e  
   } <o^mQq&  
  } OA&NWAm4  
  else if((lParam&0xc000ffff)==1){ //有键按下 rXo,\zI;u^  
   switch(wParam) 9O~1o?ni  
   { D?8t'3no  
    case VK_MENU: 5/>G)&  
     MaskBits|=ALTBIT; ~+V]MT  
     break; y/4 4((O  
    case VK_CONTROL: 64o`7  
     MaskBits|=CTRLBIT; VBBqoyP h  
     break; "?}QwtUW  
    case VK_SHIFT:  Js'COO  
     MaskBits|=SHIFTBIT; l?Bv9k.^?  
     break; 3eFD[c%mN  
    default: //judge the key and send message ir3iW*5k  
     break; l{_>?]S5  
   } Pg|q{fc  
   for(int index=0;index<MAX_KEY;index++){ ;{j:5+'  
    if(hCallWnd[index]==NULL) K\,&wU  
     continue; hRtnO|Z6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #^%Rk'W  
    { ezC55nm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); E':y3T@."  
     bProcessed=TRUE; jFbz:aUF  
    } IgR_p7['.  
   } rS{Rzs^@  
  } f+-w~cN  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 W5EB+b49KM  
   for(int index=0;index<MAX_KEY;index++){ m9.QGX\]  
    if(hCallWnd[index]==NULL) !>  
     continue; ,Es5PmV@$%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /N{xFt/?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ^L*:0P~  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 WVf;uob{  
   } ].7)^  
  } .#lQZo6$\|  
 } SI8mr`gJ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); H:a(&Zb  
} 4$1sBY/  
JG0TbM1(Bt  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: xa5I{<<U  
rM_8piD  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *~:4&$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); q J@XVN4   
!NZFo S~  
  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: V: 2|l!l*  
q#c\  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +f;z{)%B  
{ r }pYm'e  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) pc:~_6S  
 { 0waQw7 E  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 [1G4he%  
  SaveBmp(); Mp7r`A,6  
  return FALSE; Y[ a$~n^:n  
 } Vdh5s292h  
 …… //其它处理及默认处理 &NB[:S =  
} ;_1D-Mf  
:&9#p% /  
Wd3/Y/MD  
  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。 y*2:(nI  
KR?-<  
  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。 (VU: &.  
` ~VV1  
  二、编程步骤 dHg[0Br)r  
*^}(LoPZ  
  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"; 7K%Ac  
 gX.4I;  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; v>;6pcp[F  
G%Wjtrpj  
  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; gM^ Hs7o,  
{6 C!^ 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; _LCK|H%v'  
BQ2DQ7q  
  5、 添加代码,编译运行程序。 w)5eD+n\-  
P9SyQbcK  
三、程序代码 zxT&K|  
D-69/3PvP  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL [ !].G=8  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) #zZQ@+5zw  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ j^Bo0{{  
#if _MSC_VER > 1000 bX=A77  
#pragma once Rm&i"  
#endif // _MSC_VER > 1000 G\=7d%T+  
#ifndef __AFXWIN_H__ h/QZcA  
#error include 'stdafx.h' before including this file for PCH 65)/|j+  
#endif *)T},|Gc  
#include "resource.h" // main symbols >#)^4-e  
class CHookApp : public CWinApp !QSL8v@c  
{ Jx.Jx~  
 public: Y'DI@  
  CHookApp(); ZZX|MA!  
  // Overrides /!P,o}l7  
  // ClassWizard generated virtual function overrides F  MHp a  
  //{{AFX_VIRTUAL(CHookApp) K.JKE"j)d  
 public: Oz-X}eM  
  virtual BOOL InitInstance(); jLM1 ~`&  
  virtual int ExitInstance(); Dc}-wnga  
  //}}AFX_VIRTUAL q~ T*R<S  
  //{{AFX_MSG(CHookApp) !Hr~B.f7  
  // NOTE - the ClassWizard will add and remove member functions here. nulVQOj|  
  // DO NOT EDIT what you see in these blocks of generated code ! '[I?G6  
  //}}AFX_MSG 69p>?zn  
  DECLARE_MESSAGE_MAP() l> W?XH  
}; g;UB+Y 247  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); %8DU}}Rj  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z[[q W f  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9NBFG~)|l[  
BOOL InitHotkey(); t ux/@}I  
BOOL UnInit(); )4toBDg"  
#endif wJNiw)C  
>DP9S@W  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. N! }p  
#include "stdafx.h" C-V,3}=*2  
#include "hook.h" ~+/IzckrG  
#include <windowsx.h> Wj(O_2  
#ifdef _DEBUG @aAB#,  
#define new DEBUG_NEW bzF>Efza  
#undef THIS_FILE -B*= V  
static char THIS_FILE[] = __FILE__; ;%0$3a  
#endif &z+nNkr?yN  
#define MAX_KEY 100 +? E~F  
#define CTRLBIT 0x04 6k|o<`~,  
#define ALTBIT 0x02 N^*%{[<5  
#define SHIFTBIT 0x01 7;2j^qPr  
#pragma data_seg("shareddata") <v>^#/.0  
HHOOK hHook =NULL; )+OI}  
UINT nHookCount =0; +C' u!^ )  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey I} q2)@  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT @@-n/9>vs  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey iP]KV.e'/C  
static int KeyCount =0; ~k^rIjR  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift J<'[P$D  
#pragma data_seg() lm i,P-Q  
HINSTANCE hins;  z"Miy  
void VerifyWindow(); ~:'tp28?  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 1hp`.!3]H  
//{{AFX_MSG_MAP(CHookApp) ;wK;  
// NOTE - the ClassWizard will add and remove mapping macros here. >E;kM B  
// DO NOT EDIT what you see in these blocks of generated code!  Tvqq#;I  
//}}AFX_MSG_MAP ikX"f?Q;S2  
END_MESSAGE_MAP() BiT #bg  
@.0>gmY;:  
CHookApp::CHookApp()  sC1Mwx  
{ eyUguA<lK\  
 // TODO: add construction code here, N?hQ53#3  
 // Place all significant initialization in InitInstance *?x$q/a  
} zl^ %x1G  
&kUEnwQ -  
CHookApp theApp; `<2k.aW4e8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Q3[MzIk 4  
{ 6Ri+DPf:  
 BOOL bProcessed=FALSE; LM\H%=*L  
 if(HC_ACTION==nCode) #s>AiD  
 { &&T\PspM  
  if((lParam&0xc0000000)==0xc0000000){// Key up Z}#'.y\ f  
   switch(wParam) }Z#KPI8\Q  
   { b+Sq[  
    case VK_MENU: VwvL  
     MaskBits&=~ALTBIT; 1yC_/Va1  
     break; >cU#($X$^  
    case VK_CONTROL: QxS] 6hA  
     MaskBits&=~CTRLBIT; w"ZngrwBl  
     break; ndg1E;>  
    case VK_SHIFT: SQ'\Kd=  
     MaskBits&=~SHIFTBIT; VzD LGLH  
     break; J_ NY:B  
    default: //judge the key and send message H1>~,zc>E  
     break; {*mf Is  
   } 7+ +Fak  
   for(int index=0;index<MAX_KEY;index++){ K</EVt,U~  
    if(hCallWnd[index]==NULL) #N Qpr  
     continue; ]8@s+ N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qW+'#Jh@TV  
    { %hDx UZ#0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); nilis-Bk_  
     bProcessed=TRUE; I]Ev6>=;  
    } _|+}4 ap  
   } sjGy=d{:oL  
  } v z6No%8X  
  else if((lParam&0xc000ffff)==1){ //Key down yX 9 .yq  
   switch(wParam) E{s p  
   { $ix:S$  
    case VK_MENU: S:B$c>  
     MaskBits|=ALTBIT; q8A;%.ZLG  
     break; gxnIur)  
    case VK_CONTROL: }a O6%  
     MaskBits|=CTRLBIT; 8u8-:c%{  
     break; O|K-UTWH%  
    case VK_SHIFT: MrjgV+P}[  
     MaskBits|=SHIFTBIT; 5"sd  
     break; CWT#1L=  
    default: //judge the key and send message ]2E#P.-!b  
     break; +MZsL7%  
   } GmhfBW?  
   for(int index=0;index<MAX_KEY;index++) P* X^)R  
   { oZ,J{I!L  
    if(hCallWnd[index]==NULL) i4T=4q  
     continue; n( RQre  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `PY=B$?{4  
    { FEY_(70  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |\.:h":!0~  
     bProcessed=TRUE; Me 5Xd|  
    } RN^<bt{_U  
   } K* R  
  } [nc-~T+Mo  
  if(!bProcessed){ ca=sc[ $+  
   for(int index=0;index<MAX_KEY;index++){ sqXwDy+.  
    if(hCallWnd[index]==NULL) i%@blz:_Y  
     continue; hY5GNYDh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) i~3\jD=<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 3d>8~ANi=%  
   } !$u:_8  
  } )J^5?A  
 } @7HHi~1JK  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :$6mS[@|  
} lA{JpH_Y8s  
B4@1WZn<8  
BOOL InitHotkey() MO^Q 8v  
{ ^>wlj  
 if(hHook!=NULL){ 3</W}]$)p  
  nHookCount++; M ^ZEAZi  
  return TRUE; p40;@gUug  
 } *@I/TX'\rY  
 else 0tKVo]EK  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Q~R%|Q{&  
  if(hHook!=NULL) tm1#Lh0  
   nHookCount++; vh"wXu  
  return (hHook!=NULL); B>}B{qi|  
} z:^ (#G{  
BOOL UnInit() 8n/8uRIR  
{ lVv'_9yg  
 if(nHookCount>1){ YsO3( HS  
  nHookCount--; qnb#~=x^  
  return TRUE; GIb,y,PDB  
 } ARUzEo gcf  
 BOOL unhooked = UnhookWindowsHookEx(hHook); e0<Wed  
 if(unhooked==TRUE){ u>ZH-nw O  
  nHookCount=0; BOfl hoUX  
  hHook=NULL; y(ceEV  
 } 23d*;ri5  
 return unhooked; E- jJ!>&K  
} jl>jy6T  
0fGt7 "Q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) xX?9e3(  
{ tWyl&,3?1  
 BOOL bAdded=FALSE; E4$y|Ni"  
 for(int index=0;index<MAX_KEY;index++){ !J&UO/q.  
  if(hCallWnd[index]==0){ IG.!M@_  
   hCallWnd[index]=hWnd; HTLS$o;Q  
   HotKey[index]=cKey; 0"}=A,o(w  
   HotKeyMask[index]=cMask; D&o ~4Qvc]  
   bAdded=TRUE; J#IVu?B  
   KeyCount++; z6*r<>Bf+b  
   break; ^ Paf-/  
  } A vww @$  
 } { SF'YbY  
 return bAdded; ;Q8`5h   
} i>7]9gBm1q  
)3f<0C>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) K=! C\T"I%  
{ NR,R.N^[  
 BOOL bRemoved=FALSE; :d6]rOpX  
 for(int index=0;index<MAX_KEY;index++){ j.!5&^;u4  
  if(hCallWnd[index]==hWnd){ SoWMP2/  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ n-9a 0_{k  
    hCallWnd[index]=NULL; uZTbJ3$$  
    HotKey[index]=0; 2KlVj]!7  
    HotKeyMask[index]=0; &^`[$LtYd  
    bRemoved=TRUE; shD4";8*@  
    KeyCount--; : q>)c]  
    break; d]USk&8  
   } "S+AkLe(  
  } i#NtiZ.t=  
 } bE,#,  
 return bRemoved; :N !s@6  
} .,sbqL  
O5MV&Zb(  
void VerifyWindow() cQ;@z2\  
{ #qu;{I#W3  
 for(int i=0;i<MAX_KEY;i++){ ]SAGh|+xl  
  if(hCallWnd!=NULL){  wh#IQ.E-  
   if(!IsWindow(hCallWnd)){ I<Cm$8O?  
    hCallWnd=NULL; l,6' S8=  
    HotKey=0; riF-9 %i  
    HotKeyMask=0; #eF,* d  
    KeyCount--; j u&v4]  
   } <*I*#WI&B  
  } A{dqB  
 } bk0<i*ju7(  
} r $[{sW  
iGSF5S  
BOOL CHookApp::InitInstance() Es- =0gpK  
{ vmv6y*qU  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 0 . UN  
 hins=AfxGetInstanceHandle(); baBPf{<  
 InitHotkey(); Q;ZV`D/FA  
 return CWinApp::InitInstance(); e7y,zcbv  
} SQ*%d.1  
._]*Y`5)d  
int CHookApp::ExitInstance() m70AWG  
{ .+mP#<mAg  
 VerifyWindow(); odDVdVx0  
 UnInit(); 8>G5VhCm~o  
 return CWinApp::ExitInstance(); G)?j(El  
} R_9M-RP6*  
] *U+nG  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file #)m [R5g(  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Em4'b1mDX%  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ H ?eG5  
#if _MSC_VER > 1000 2c51kG77E  
#pragma once *Kpw@4G   
#endif // _MSC_VER > 1000 z0x^HDAeC  
Z<W f/  
class CCaptureDlg : public CDialog ;s#I b_  
{ PdEPDyFkh  
 // Construction D-D8La?0p  
 public: +U<.MVOo.  
  BOOL bTray; n^rbc ;}  
  BOOL bRegistered; O 3?^P"C  
  BOOL RegisterHotkey(); \Unawv~  
  UCHAR cKey; GO"E>FyB  
  UCHAR cMask; wz@[rMf  
  void DeleteIcon(); Lp3pJE  
  void AddIcon(); A6+qS [  
  UINT nCount; W4qnXD1n  
  void SaveBmp(); Vx:uqzw#  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor c6 .j$6t  
  // Dialog Data oKr= ]p  
  //{{AFX_DATA(CCaptureDlg) xnJ#}-.7  
  enum { IDD = IDD_CAPTURE_DIALOG }; ZFh[xg'0  
  CComboBox m_Key; vXZP>  
  BOOL m_bControl; Bio QV47B  
  BOOL m_bAlt; _v 8u%  
  BOOL m_bShift; bMsThoePT  
  CString m_Path; 5z_Kkf?o  
  CString m_Number; @+_pj.D  
  //}}AFX_DATA xSO5?eR"u  
  // ClassWizard generated virtual function overrides ~[kI! [  
  //{{AFX_VIRTUAL(CCaptureDlg) Y] UoV_  
 public: fB&i{_J  
  virtual BOOL PreTranslateMessage(MSG* pMsg); zsj]WP6 j  
 protected: z =\ENG|x#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support vR pO0qG  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); gv&Hu$ ca  
  //}}AFX_VIRTUAL )Jw$&%/{1  
  // Implementation *=]UWM~]  
 protected: nv(6NV  
  HICON m_hIcon; fGW~xul_  
  // Generated message map functions Ic^ (6  
  //{{AFX_MSG(CCaptureDlg) "rc QS H  
  virtual BOOL OnInitDialog(); ,&s"f4Mft  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); RQu[FZT,  
  afx_msg void OnPaint(); D><^7nr%  
  afx_msg HCURSOR OnQueryDragIcon(); a2]>R<M  
  virtual void OnCancel(); zTl,VIa3p  
  afx_msg void OnAbout(); 4N1)+ W8k*  
  afx_msg void OnBrowse(); In;P33'p  
  afx_msg void OnChange(); L^PBcfg  
 //}}AFX_MSG 5Vdy:l  
 DECLARE_MESSAGE_MAP() pc QkJ F  
}; gxJ12' m  
#endif DGw*BN%`  
b\kA  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file kIe)ocJg  
#include "stdafx.h" &OkPO|  
#include "Capture.h" _PQk<QZ  
#include "CaptureDlg.h" !aJ6Uf%R  
#include <windowsx.h> biForT_no  
#pragma comment(lib,"hook.lib") C[l5[DpH  
#ifdef _DEBUG K|Xe)  
#define new DEBUG_NEW '#oH1$W]  
#undef THIS_FILE cBU3Q<^  
static char THIS_FILE[] = __FILE__; ] r%fAm j  
#endif dB QCr{7  
#define IDM_SHELL WM_USER+1 )c 79&S  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); d+5v[x~'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $" =3e]<  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ka{!' ^  
class CAboutDlg : public CDialog b2j ~"9  
{ (^_I Ny*  
 public: 2T@?&N^OD  
  CAboutDlg(); r gi4>  
  // Dialog Data *+00  
  //{{AFX_DATA(CAboutDlg) g706*o)h  
  enum { IDD = IDD_ABOUTBOX }; ,g3n/'rP%  
  //}}AFX_DATA "ub0}p4V  
  // ClassWizard generated virtual function overrides r^ '  
  //{{AFX_VIRTUAL(CAboutDlg) RMid}BRE  
 protected: B5R7geC  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?%D nIl>  
  //}}AFX_VIRTUAL Z^%HDB9^  
  // Implementation 0Pt% (^  
 protected: (h[. Ie  
  //{{AFX_MSG(CAboutDlg) cK\?wZ| Y  
  //}}AFX_MSG ,% .)mf  
  DECLARE_MESSAGE_MAP() v`Ja Bn  
}; ^X"x,8}&V  
A!uiM*"W  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Jp_ :.4  
{ EY c)v6[  
 //{{AFX_DATA_INIT(CAboutDlg) 'z=d&K  
 //}}AFX_DATA_INIT 92N`Q}  
} |@f\[v9`  
gO@LJ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) RXu` DWN  
{ 9C!b f \  
 CDialog::DoDataExchange(pDX); 7xO~v23oe  
 //{{AFX_DATA_MAP(CAboutDlg)  9/I xh?  
 //}}AFX_DATA_MAP 2r]o>X  
} ~LP5hL  
%F}d'TPx  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) F ^m;xy  
 //{{AFX_MSG_MAP(CAboutDlg) # $'H?lO  
 // No message handlers QBfo=9[=e  
 //}}AFX_MSG_MAP /#q6.du  
END_MESSAGE_MAP() FJ{&R Ld  
hx4c`fOs  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 5aXE^.`  
: CDialog(CCaptureDlg::IDD, pParent) ~\<L74BB  
{ 6['o^>\}f  
 //{{AFX_DATA_INIT(CCaptureDlg) Q~rE+?n9 F  
  m_bControl = FALSE; 41Ab,  
  m_bAlt = FALSE; m6A\R KJ'  
  m_bShift = FALSE; k 6i&NG6  
  m_Path = _T("c:\\"); QR<<O  
  m_Number = _T("0 picture captured."); w02C1oGfx  
  nCount=0; ^oClf(  
  bRegistered=FALSE; nV8iYBBym  
  bTray=FALSE; ,s:viXk  
 //}}AFX_DATA_INIT _NpxV'E  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 U8,pe;/ln`  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); dOKe}?}==  
} Q|U [|U  
kQn}lD  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Lzcea+*uw  
{ 9g.5:  
 CDialog::DoDataExchange(pDX); H!l 9a  
 //{{AFX_DATA_MAP(CCaptureDlg) aB`jFp-  
  DDX_Control(pDX, IDC_KEY, m_Key); {.e^1qE  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); PY&mLux%  
  DDX_Check(pDX, IDC_ALT, m_bAlt); m3&b)O7  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ,"YTG*ky  
  DDX_Text(pDX, IDC_PATH, m_Path); n?9FJOqi  
  DDX_Text(pDX, IDC_NUMBER, m_Number); d'b9.ki\  
 //}}AFX_DATA_MAP Az:A,;~+,!  
} 8q:# '  
A8:eA  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) vkeZ!klYB  
//{{AFX_MSG_MAP(CCaptureDlg) o1-_BlZ  
 ON_WM_SYSCOMMAND() #qK5i1<  
 ON_WM_PAINT() ,3!4 D^  
 ON_WM_QUERYDRAGICON() o,@ (]e~  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) rD9:4W`^  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) _N0N #L4M  
 ON_BN_CLICKED(ID_CHANGE, OnChange) @3S:W2k  
//}}AFX_MSG_MAP SzfMQ@~  
END_MESSAGE_MAP() _sY; dS/  
c: (nlYZ   
BOOL CCaptureDlg::OnInitDialog() #]Jg>  
{ }d5~w[  
 CDialog::OnInitDialog(); O]Y   z7  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); \l`{u)V  
 ASSERT(IDM_ABOUTBOX < 0xF000); bL+}n8B  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Q\btl/?  
 if (pSysMenu != NULL) Wr'1Y7z  
 { tZu1jBO_Q4  
  CString strAboutMenu; i)$<j!L  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Wv ~&Qh}  
  if (!strAboutMenu.IsEmpty()) x@[6u  
  { k~, k@mR  
   pSysMenu->AppendMenu(MF_SEPARATOR); ,ne3uPRu7~  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); O%px>rdkY  
  } ud"Kko Rt  
 } =1<v1s|)q  
 SetIcon(m_hIcon, TRUE); // Set big icon wxT( ktE  
 SetIcon(m_hIcon, FALSE); // Set small icon QV4FA&f&  
 m_Key.SetCurSel(0); 4=N(@mS  
 RegisterHotkey(); 0sB[]E|7[s  
 CMenu* pMenu=GetSystemMenu(FALSE); a|4Q6Ycu  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 'rA(+-.M;  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 62K#rR S  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); bfy=  
 return TRUE; // return TRUE unless you set the focus to a control !/=.~B  
} zJ@^Bw;A^@  
Y%>u.HzL  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Pw5[X5.DX  
{ QZ*gR#K]Sz  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) [ugr<[6  
 { MV07RjeS  
  CAboutDlg dlgAbout; P]armg%  
  dlgAbout.DoModal(); t+{vb S0  
 } '|<S`,'#hg  
 else &:1q3 gDm  
 { usC$NVdm  
  CDialog::OnSysCommand(nID, lParam); '}"&JO~vPj  
 } S0}=uL#dt  
} wN :"(mQ  
xn,9Wj-  
void CCaptureDlg::OnPaint() :+"H h%  
{ 2gR*]?C*  
 if (IsIconic()) 1+YqdDqQ  
 { P+QL||>L  
  CPaintDC dc(this); // device context for painting syI|gANT/r  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 'g3T'2"`5  
  // Center icon in client rectangle V)vik  
  int cxIcon = GetSystemMetrics(SM_CXICON); 8IE^u<H(:  
  int cyIcon = GetSystemMetrics(SM_CYICON); %Y>E  
  CRect rect; &So1;RR,_M  
  GetClientRect(&rect); y0~ttfv  
  int x = (rect.Width() - cxIcon + 1) / 2; |.L_c"Bc  
  int y = (rect.Height() - cyIcon + 1) / 2; dlIYzO<  
  // Draw the icon 0?dr(   
  dc.DrawIcon(x, y, m_hIcon); ia_l P  
 } FYK`.>L28  
 else W+5. lf=2>  
 { 2U( qyC  
  CDialog::OnPaint(); 0N$FIw2  
 } %$i}[ U  
} W+$G{XSr5C  
=%c\<<]aV  
HCURSOR CCaptureDlg::OnQueryDragIcon() PC|ul{[*}  
{ .t/@d(R  
 return (HCURSOR) m_hIcon; ,Q0H)// ~  
} M |f V7g  
V Ew| N)  
void CCaptureDlg::OnCancel() t[@>u'YKt  
{ \O\q1 s~  
 if(bTray) l5\V4  
  DeleteIcon(); QHc([%oV  
  CDialog::OnCancel(); gga}mqMv=  
} yxU9W,D v  
jL'`M%8O  
void CCaptureDlg::OnAbout() #<EYO  
{ SvrUXf  
 CAboutDlg dlg; =%7s0l3z  
 dlg.DoModal(); ivyaGAF}+o  
} _x|.\j  
3!vzkBr  
void CCaptureDlg::OnBrowse() ?~!9\dek,  
{ n?;rWq"  
 CString str; xu%eg]  
 BROWSEINFO bi;  K[LuvS  
 char name[MAX_PATH]; h9#)Eo   
 ZeroMemory(&bi,sizeof(BROWSEINFO)); z^z`{B  
 bi.hwndOwner=GetSafeHwnd(); /,UnT(/k(  
 bi.pszDisplayName=name; P.QF9%  
 bi.lpszTitle="Select folder"; ~QDM .5  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; C+[)^ 2M{  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); aB?usVoS  
 if(idl==NULL) aT(_c/t.  
  return; R n]xxa'  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); +jyGRSo  
 str.ReleaseBuffer(); X6 N&:<  
 m_Path=str; 7 nFOV Z  
 if(str.GetAt(str.GetLength()-1)!='\\') / *PHX@  
  m_Path+="\\";  bLAHVi<.  
 UpdateData(FALSE); 2#r4dr0  
} :tI F*pC  
R&a$w8  
void CCaptureDlg::SaveBmp() {]Hv*{ ]  
{ /-G_0 A2wF  
 CDC dc; ai-rF^ehC  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Bc[~'gn  
 CBitmap bm; w,$qsmR  
 int Width=GetSystemMetrics(SM_CXSCREEN); U+@U/s%8  
 int Height=GetSystemMetrics(SM_CYSCREEN); [.1ME lM  
 bm.CreateCompatibleBitmap(&dc,Width,Height); PMV,*`"9"A  
 CDC tdc; RtzSe$O  
 tdc.CreateCompatibleDC(&dc); PP>6  
 CBitmap*pOld=tdc.SelectObject(&bm); K,$rG%c zX  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); n|LpM.  
 tdc.SelectObject(pOld); l{>j8Ln  
 BITMAP btm; -]H~D4ng  
 bm.GetBitmap(&btm); "aCAA#$J  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; e,MsF4'  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ;R[3nb9%  
 BITMAPINFOHEADER bih; "Y=`w,~~  
 bih.biBitCount=btm.bmBitsPixel; T'@+MA) ~  
 bih.biClrImportant=0; >m. .  
 bih.biClrUsed=0; oPM*VTMA  
 bih.biCompression=0; #j=yQrJ  
 bih.biHeight=btm.bmHeight; G{E`5KIvm  
 bih.biPlanes=1; Zd-6_,r  
 bih.biSize=sizeof(BITMAPINFOHEADER); 2wHbhW[  
 bih.biSizeImage=size; y& 1@d+Lf  
 bih.biWidth=btm.bmWidth; ?1a9k@[t  
 bih.biXPelsPerMeter=0; ne/JC(  
 bih.biYPelsPerMeter=0; F_jHi0A  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); %0N HU`j  
 static int filecount=0; W ';X4e  
 CString name; ,3y9yJQa*#  
 name.Format("pict%04d.bmp",filecount++); Z>Mv$F"p:  
 name=m_Path+name; cgSN:$p(R  
 BITMAPFILEHEADER bfh; _Uq' N0U  
 bfh.bfReserved1=bfh.bfReserved2=0; <.B+&3')  
 bfh.bfType=((WORD)('M'<< 8)|'B'); $[n:IDa*@1  
 bfh.bfSize=54+size; T?t/[iuHrj  
 bfh.bfOffBits=54; .8Bo5)q$a-  
 CFile bf; Zrr)<'!i  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ p2{7+m  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); MA6 Vy  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ;ryNfP%  
  bf.WriteHuge(lpData,size); !NkCki"W  
  bf.Close(); 5$D"uAp<V  
  nCount++; d#H9jg15e  
 } o1x1SH  
 GlobalFreePtr(lpData); b' y*\9Ru  
 if(nCount==1) q1( [mHZ  
  m_Number.Format("%d picture captured.",nCount); n]ba1t8ZA  
 else '=n?^EPE3  
  m_Number.Format("%d pictures captured.",nCount); 4^F%bXJ)  
  UpdateData(FALSE); N+rU|iMa.  
} '#Au~5  
=I@t%Y  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) "4)N]Nj  
{ "+- 'o+  
 if(pMsg -> message == WM_KEYDOWN) K+F"VW*?  
 { _!@:@e)yB{  
  if(pMsg -> wParam == VK_ESCAPE) czuIs|_K*  
   return TRUE; [eDrjf3m  
  if(pMsg -> wParam == VK_RETURN) d*0 RBgn  
   return TRUE; -HG .GA  
 } R[ a-"  
 return CDialog::PreTranslateMessage(pMsg); .qO4ceW2-~  
} {_-kwg{"(  
uK2HtRY1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {E:`  
{ 2Lf,~EV  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ D=TS IJ@  
  SaveBmp(); Og/aTR<;=  
  return FALSE; $`E?=L`$  
} q[,p#uJ]  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ yu6{6 [  
 CMenu pop; 2@<_,'  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); =cS&>MT  
 CMenu*pMenu=pop.GetSubMenu(0); jtP*C_Scv/  
 pMenu->SetDefaultItem(ID_EXITICON); :ZV |8xI  
 CPoint pt; ERpAV-Zf  
 GetCursorPos(&pt); HcsV q+  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); j|k/&q[St  
 if(id==ID_EXITICON) s)a-ky(  
  DeleteIcon(); 6]?mjG6  
 else if(id==ID_EXIT) 3' i6<  
  OnCancel(); E1eGZ&&Gd  
 return FALSE; CO='[1"_5  
} g Ed A hfx  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); e0zP LU}  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Z8 #nu  
 AddIcon(); u ]e-IYH  
 return res; &Q883A J  
} w\bwa!3Y  
Jr2yn{s=S  
void CCaptureDlg::AddIcon() ^v'kEsE^*  
{ -G~]e6:zD  
 NOTIFYICONDATA data; 4 XjwU`  
 data.cbSize=sizeof(NOTIFYICONDATA); wtTy(j,9  
 CString tip; .h-mFcjy  
 tip.LoadString(IDS_ICONTIP); d m8t ~38  
 data.hIcon=GetIcon(0); iBSM \ n  
 data.hWnd=GetSafeHwnd(); Lq2Q:w'  
 strcpy(data.szTip,tip); e= IdqkJ%  
 data.uCallbackMessage=IDM_SHELL; ]F4QZV( M  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ,|:.0g[n  
 data.uID=98; tOiz tYu  
 Shell_NotifyIcon(NIM_ADD,&data); .SD-6GVD  
 ShowWindow(SW_HIDE); .\R9tt}  
 bTray=TRUE; mWT+15\5r(  
} o5o myMN  
P%aqY~yF3  
void CCaptureDlg::DeleteIcon() xsZG(Tz  
{ >Ku4Il+36  
 NOTIFYICONDATA data; :?6HG_9X  
 data.cbSize=sizeof(NOTIFYICONDATA); ~)U50. CH  
 data.hWnd=GetSafeHwnd(); &Hb%Q! ^Kb  
 data.uID=98; "lh4Vg\7n  
 Shell_NotifyIcon(NIM_DELETE,&data); o08WC'bX  
 ShowWindow(SW_SHOW); |g&V? lI  
 SetForegroundWindow(); Lv%3 jj  
 ShowWindow(SW_SHOWNORMAL); {N4 'g_  
 bTray=FALSE; 4z0gyCAC A  
} .l1x~(  
?+t;\  
void CCaptureDlg::OnChange() ys9:";X;}  
{ >dl5^  
 RegisterHotkey(); 4YfM.~ 6  
} T+Z[&|  
J4T"O<i$58  
BOOL CCaptureDlg::RegisterHotkey() >3!~U.AA'x  
{ u#76w74  
 UpdateData(); B$ eM  
 UCHAR mask=0; wpK1nA+7N  
 UCHAR key=0; rl|'.~mc  
 if(m_bControl) ?^Rp" H   
  mask|=4; e )0 ]WJ  
 if(m_bAlt) & FhJ%JK  
  mask|=2; t1w5U+z  
 if(m_bShift) zZCl]cql  
  mask|=1; q\EYsN</;  
  key=Key_Table[m_Key.GetCurSel()]; !mlfG "FE  
 if(bRegistered){ hVz yvpw  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); @_ %RQO_X  
  bRegistered=FALSE; cMY}Y [2c  
 } rN}pi@  
 cMask=mask; & kC  
 cKey=key; /~NX<Ye&  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); /vSGmW-*  
 return bRegistered; QX=TuyO  
} >(RkoExO/  
ojM'8z 0Hn  
  四、小结 Jt8;ddz  
+e{ui +  
  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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