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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: *9r 32]i;  
  r9-)+R J  
  一、实现方法 \/y&l\ k)  
%+ MYg^  
  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: |ew:}e: k<  
% <%r  
#pragma data_seg("shareddata") L{c\7  
HHOOK hHook =NULL; //钩子句柄 ~;wR}s<}(  
UINT nHookCount =0; //挂接的程序数目 <&t[E0mU  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 SQw"mO  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 K~8!Gh{h]  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey .d4&s7n0  
static int KeyCount =0; ]b^bc2:  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ` -<S13  
#pragma data_seg() P\ 2Bx *e  
VF"c}  
  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。 &v r0{]V^  
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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: I]d?F:cdX  
&#]||T-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 34vH+,!u  
cKey,UCHAR cMask) -r{]9v2j  
{ lWU? R  
 BOOL bAdded=FALSE; &G+:t)|S  
 for(int index=0;index<MAX_KEY;index++){ \FyHIs  
  if(hCallWnd[index]==0){ 3\P/4GK)  
   hCallWnd[index]=hWnd; YdAC<,e&A  
   HotKey[index]=cKey; ".fnx8v,  
   HotKeyMask[index]=cMask; C2 !F   
   bAdded=TRUE; `[f IK,  
   KeyCount++; -n$hm+S  
   break; 7q^a@5f BG  
  } w:9n/[  
 } ^`(3X  
 return bAdded; X*:)]p(R  
} c5HW.3"  
//删除热键 LS1}j WU!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) gHU0Pr9'  
{ s3gT6  
 BOOL bRemoved=FALSE; & =vi]z:[  
 for(int index=0;index<MAX_KEY;index++){ {Hxziyv~Y(  
  if(hCallWnd[index]==hWnd){ MCfDR#a  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ M5LqZyY  
    hCallWnd[index]=NULL; 55x.Q  
    HotKey[index]=0; k%cT38V*  
    HotKeyMask[index]=0; FBI^}^#_  
    bRemoved=TRUE; Uw>g^[V;  
    KeyCount--; E`3[62C  
    break; Z9PG7h  
   } ]<E\J+5K  
  } k5GJrK+  
 } X]%n#\t,]  
 return bRemoved; %|?PG i@5  
} x$V[xX  
/57)y_ \  
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  DLL中的钩子函数如下: If.hA}  
cz*Z/5XH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) =)XC"kU p  
{ a 1pa#WC  
 BOOL bProcessed=FALSE; 0-A@X>6bs  
 if(HC_ACTION==nCode) pd}af iF  
 { -B#>Jn#F  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 '\Hh  
   switch(wParam) +Tp>3Jh2  
   {  EWoGdH|  
    case VK_MENU: KZTT2KsYl  
     MaskBits&=~ALTBIT; c5tCw3$t  
     break; B976{;QvXV  
    case VK_CONTROL: {= l 9{K`~  
     MaskBits&=~CTRLBIT; 09rbu\h  
     break; yi3Cd@t({{  
    case VK_SHIFT: t[^68]  
     MaskBits&=~SHIFTBIT; @{UtS2L  
     break; 9.$k^|~  
    default: //judge the key and send message &]HY:  
     break; 62%=%XD  
   } tdB<  
   for(int index=0;index<MAX_KEY;index++){ ?e!mv}B_  
    if(hCallWnd[index]==NULL) ]W 6!Xw)[  
     continue; n8>( m,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |B.tBt^  
    { '>5W`lZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $[8GFv  
     bProcessed=TRUE; *H,vqs\}y  
    } veh?oJi@  
   } *4F6U  
  } ;3WVrYe  
  else if((lParam&0xc000ffff)==1){ //有键按下 6N'v`p8  
   switch(wParam) N!:&Xz  
   { |\/Y<_)JD  
    case VK_MENU: ~!a~ -:#  
     MaskBits|=ALTBIT; |cCrLa2*-  
     break; ?Dk&5d^d  
    case VK_CONTROL: x0_$,Tz@  
     MaskBits|=CTRLBIT; }*I:0"WH  
     break; sKI{AHJ?X  
    case VK_SHIFT: rXlJW]i  
     MaskBits|=SHIFTBIT; W-+~r  
     break;  \>*B  
    default: //judge the key and send message bjEm=4FI;  
     break; &]Q\@;]Aq  
   } StJ&YYdD  
   for(int index=0;index<MAX_KEY;index++){ \sZ!F&a~  
    if(hCallWnd[index]==NULL) 0(!D1G{ul  
     continue; ;y"q uJ'O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) H"A|Z6y$^  
    { ?4,e?S6,[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); fB3W} dr  
     bProcessed=TRUE; !4B($]t  
    } VCZ.{MD  
   } 0W I3m2i  
  } RZV6\ j  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 P Yp<eo\  
   for(int index=0;index<MAX_KEY;index++){ TS{ycGY  
    if(hCallWnd[index]==NULL) I+]q;dF;  
     continue; Wp<4F 6C$@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) gIfl}Jat  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ki[Yu+';}  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 9'|NF<  
   } t)Mi,ljY[  
  } 4<`'?  
 } fQ[ GN}k  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  0"_FQv  
} Spossp`|  
<Prz>qL$  
  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: nT.2HQ((Xg  
$($26g  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~]_g q;bG  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); pO.+hy  
s*k[Fbi  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 9$pQ|e0tJ  
HTz&h#)JQ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5[_|+  
{ '%$)"g]/#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) CG(G){u&  
 { bZ.q?Hlfk  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 P<@V  
  SaveBmp(); e-dpk^-  
  return FALSE; O%.c%)4Xo  
 } "[ 091<  
 …… //其它处理及默认处理 D/1f> sl  
} nmn 8Y V1  
WZ a?Xb  
&cEQ6('H  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 dd +%d  
"r Bb2.  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Tq7cZe"6  
qMrBTq[  
  二、编程步骤 '7UW\KEB[}  
yrnIQu*Uu  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; %,G&By&,  
ppjS|l*`  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 4]F:QS% x  
#&A)%Qbg  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; #G;0yB:76  
J1Ay^*qRU  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ?n 9<PMo  
yaiw|j`A  
  5、 添加代码,编译运行程序。 M~Tx 4_t  
t<Iy `r7 1  
三、程序代码 F|t3%dpj  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL y Q_lJIX  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) +5|wd6  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ J_]B,' 6  
#if _MSC_VER > 1000 bF5mCR:  
#pragma once h <s.o#8  
#endif // _MSC_VER > 1000 u dhj$:t  
#ifndef __AFXWIN_H__ mT@8(  
#error include 'stdafx.h' before including this file for PCH  0(2r"Hi  
#endif 9%i|_c}  
#include "resource.h" // main symbols p,hDZea  
class CHookApp : public CWinApp xWv@PqXD  
{ WQ(*A $  
 public: dvWQ?1l_  
  CHookApp(); D\}A{I92F4  
  // Overrides TmZ% ;TN  
  // ClassWizard generated virtual function overrides {_GhS%  
  //{{AFX_VIRTUAL(CHookApp) gZI88Q  
 public: 8{@0p"re@  
  virtual BOOL InitInstance(); =.Tc l"O[  
  virtual int ExitInstance(); .""?k[f5Q  
  //}}AFX_VIRTUAL $wgHaSni  
  //{{AFX_MSG(CHookApp) Sz.sX w;  
  // NOTE - the ClassWizard will add and remove member functions here. 8Z{e/wnVF  
  // DO NOT EDIT what you see in these blocks of generated code ! uTgvMkO  
  //}}AFX_MSG MCBZq\c  
  DECLARE_MESSAGE_MAP() K'6dlwn).  
}; "enGWI H  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); KiXRBFo  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \t6k(5J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); tnv @`xBn  
BOOL InitHotkey(); 8[zux4<m  
BOOL UnInit(); 8<gYB$* S  
#endif IUt/V^  
W$g<nhLK  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Vz(O=w=  
#include "stdafx.h" K"%_q$[YQ  
#include "hook.h" 'P1I-ue  
#include <windowsx.h> yMdE[/+3  
#ifdef _DEBUG KCE5Z?k  
#define new DEBUG_NEW O$=[m9V  
#undef THIS_FILE i(hI\hD  
static char THIS_FILE[] = __FILE__; IQ$cLr-S  
#endif 8T&.8r  
#define MAX_KEY 100 jea{BhdUr  
#define CTRLBIT 0x04 ~C|. .Z  
#define ALTBIT 0x02 S?ypka"L  
#define SHIFTBIT 0x01 '&XL|_Iq  
#pragma data_seg("shareddata") w}wABO  
HHOOK hHook =NULL; }Zs y&K  
UINT nHookCount =0; '<}N`PS#N  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 6FYO5=R  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT u0&QStI  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey i%M6$or  
static int KeyCount =0; 8zDLX,M-  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Fj?gXc5{  
#pragma data_seg() ID/=YG@  
HINSTANCE hins; (#uz_/xXa  
void VerifyWindow(); e XB'>#&s  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ?AMn>v  
//{{AFX_MSG_MAP(CHookApp) ?X'm>R. @  
// NOTE - the ClassWizard will add and remove mapping macros here. 2pKkg>/S  
// DO NOT EDIT what you see in these blocks of generated code! G?p !*7N  
//}}AFX_MSG_MAP p_^Jr*Mv  
END_MESSAGE_MAP() = ;hz,+  
it Byw1/  
CHookApp::CHookApp() (n4\$LdP-  
{ 3`%]3qd}  
 // TODO: add construction code here, ljr?Z,R4  
 // Place all significant initialization in InitInstance %25GplMT  
} d) i:-#Q  
fVb~j;  
CHookApp theApp; _>b=f  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) FTVV+9.l:  
{ 'T!^H  
 BOOL bProcessed=FALSE; Pdq}~um3{  
 if(HC_ACTION==nCode) eflmD$]SW  
 { L5-p0O`R  
  if((lParam&0xc0000000)==0xc0000000){// Key up 9L2]PU v  
   switch(wParam) } D'pyTf[  
   { AQx:}PO  
    case VK_MENU: sbeS9vE  
     MaskBits&=~ALTBIT; hH&A1vUv  
     break; 25 NTtj:X  
    case VK_CONTROL: (qG}`?219J  
     MaskBits&=~CTRLBIT; F.]D\"0`  
     break; M<nKk#!+h  
    case VK_SHIFT: ';>]7oT`  
     MaskBits&=~SHIFTBIT; $N;Nvp2  
     break; <$ "   
    default: //judge the key and send message *H2@lrc  
     break; 9oe=*#Ig1m  
   } No|T#=BZ[  
   for(int index=0;index<MAX_KEY;index++){ wFe?0u  
    if(hCallWnd[index]==NULL) @%aU)YDwi  
     continue; Q%_QT0H9Kz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dH5 Go9`~R  
    { #N?VbDK9_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;hz;|\ko5  
     bProcessed=TRUE; mz[Q]e~&i  
    } \LN!k-c  
   } *n"{]tj^>  
  } zwLJ|>  
  else if((lParam&0xc000ffff)==1){ //Key down W@b Z~Q9  
   switch(wParam) ?RP&XrD  
   { iE6?Px9]  
    case VK_MENU: n+'gVEBA  
     MaskBits|=ALTBIT; IqA'Vz,lL  
     break; b.N$eJlQ&  
    case VK_CONTROL: Oq`CKf  
     MaskBits|=CTRLBIT; f/?uo sS  
     break; 6Z}8"VJr {  
    case VK_SHIFT: Z,jR:_ p  
     MaskBits|=SHIFTBIT; efT@A}sV  
     break; _~QiQDq  
    default: //judge the key and send message w \U?64  
     break; vtA%^~0  
   } QWncKE,O$  
   for(int index=0;index<MAX_KEY;index++) yhuzjn  
   { M:PEY*4H  
    if(hCallWnd[index]==NULL) ~x-"?K  
     continue; D&dh>Pe1;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^t 2b`n60  
    { 6E)emFkQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); TJO?BX_9  
     bProcessed=TRUE; iAl.(j  
    } rGn6S &-  
   } * ^+]`S  
  } }wIF$v?M  
  if(!bProcessed){ d,5,OJY2f  
   for(int index=0;index<MAX_KEY;index++){ ]B2%\}c  
    if(hCallWnd[index]==NULL) k#oe:u`<  
     continue; ,pTj'I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) )8Q;u8jm1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); j*6>{_[  
   } _{ Np _ (g  
  } J4woZ{d  
 } A)5;ae  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); .7<6 zG6J  
} ?niv}/'%O  
ns&3Dh(IVP  
BOOL InitHotkey() )` ^/Dj;  
{ S^q%+Z  
 if(hHook!=NULL){ .rcXxV@f  
  nHookCount++; 59l9^<{A  
  return TRUE; Clo}kdkd_  
 } )Y](Mj!D  
 else EK%J%NY  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ~_]i'ii8  
  if(hHook!=NULL) r,r"?}Z  
   nHookCount++; ty>9i]Y-  
  return (hHook!=NULL); u[<ij  
} GzN /0:b  
BOOL UnInit() sqv!,@*q  
{ '}N4SrU$  
 if(nHookCount>1){ ^&z3zFTp  
  nHookCount--; N0V`xrS  
  return TRUE; /* G-\|  
 } W[G5+*i  
 BOOL unhooked = UnhookWindowsHookEx(hHook); e#<A\?  
 if(unhooked==TRUE){ = j!nt8]8  
  nHookCount=0; W%-`  
  hHook=NULL; j9r%OZw{  
 } ) >H11o{&  
 return unhooked; UfNcI[xr  
} Njmb{L]Cps  
:5-t$^R  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0-~F%:x  
{ uE ^uP@d  
 BOOL bAdded=FALSE; Swxur+hfH  
 for(int index=0;index<MAX_KEY;index++){ $lAQcG&Q  
  if(hCallWnd[index]==0){ :m[HUh  
   hCallWnd[index]=hWnd; 3n)\D<f]#  
   HotKey[index]=cKey; wlEmy.)H  
   HotKeyMask[index]=cMask; ;[q>  
   bAdded=TRUE; +'"NKZ.>TT  
   KeyCount++; = tY%k!R  
   break; 89YG `  
  } 7csMk5NU'<  
 } er0y~  
 return bAdded; 9&"wfN N  
} vWZ?*0^  
A5IW[Gu!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w\}Q.$@  
{ \GdsQAF"  
 BOOL bRemoved=FALSE; w?JM;'<AYQ  
 for(int index=0;index<MAX_KEY;index++){ 87-z=>IU  
  if(hCallWnd[index]==hWnd){ w gkY \Q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 5`FPv4   
    hCallWnd[index]=NULL; A2%RcKY7  
    HotKey[index]=0; p7p6~;P  
    HotKeyMask[index]=0; G<FB:?|  
    bRemoved=TRUE; iTVepYv4m  
    KeyCount--; C5^9D  
    break; v m.%)F#@  
   } ehV}}1>O  
  } U1=]iG<%  
 } i{7Vh0n3S-  
 return bRemoved; Fvr$K*u  
} S^7u`-  
303x|y  
void VerifyWindow() wqF_hs(O  
{ /_V4gwb}|-  
 for(int i=0;i<MAX_KEY;i++){ Is(ZVI  
  if(hCallWnd!=NULL){  'EO"0,  
   if(!IsWindow(hCallWnd)){ 2&0#'Tb  
    hCallWnd=NULL;  +wE>h>?;  
    HotKey=0; l:14uWu|  
    HotKeyMask=0; eEX*\1Gg  
    KeyCount--; 0I}c|V'P  
   } (L,>P`CR6  
  } -cB>; f)5r  
 } ]owcx=5q%'  
} ~kOXMLRg  
2SXy)m !  
BOOL CHookApp::InitInstance() Gxw>.O){  
{ 4p&YhV7j)o  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); .GiQC {@9w  
 hins=AfxGetInstanceHandle(); |HQFqa <  
 InitHotkey(); nyx(0  
 return CWinApp::InitInstance(); blmY=/]  
} VX'G\Zz@h|  
yUX<W'-Hev  
int CHookApp::ExitInstance() >8EmfjUoc  
{ ;BW-ag \9  
 VerifyWindow(); ,L;%-}#$  
 UnInit(); L[. )!c8k  
 return CWinApp::ExitInstance(); zC WN,K`  
} t|v_[Za}Z  
-"x25~k!?F  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file %5Zhq>  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) &&TAX  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ xeKfc}:&z  
#if _MSC_VER > 1000 g)=-%n'RoE  
#pragma once >$_@p(w  
#endif // _MSC_VER > 1000 #F:\_!2c  
4=ZN4=(_[  
class CCaptureDlg : public CDialog <*+Y]=  
{ qR^i5JH}u  
 // Construction f"d4HZD^  
 public: 8RJa;JsH  
  BOOL bTray; T%@qlEmf  
  BOOL bRegistered; |K'7BK_^J  
  BOOL RegisterHotkey(); I7{ Q\C4  
  UCHAR cKey; S,GM!YZg  
  UCHAR cMask; 10ZL-7D#m  
  void DeleteIcon(); +5ue) `  
  void AddIcon(); 3bR 6Y[  
  UINT nCount; 1V;m8)RF  
  void SaveBmp(); P+(Ys[J3  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor FfibR\dhY  
  // Dialog Data &h?8yV4B  
  //{{AFX_DATA(CCaptureDlg) Dlx-mm_  
  enum { IDD = IDD_CAPTURE_DIALOG }; ^e:rRk7 &  
  CComboBox m_Key; .!Q?TSQ+{!  
  BOOL m_bControl; 4/QQX;w  
  BOOL m_bAlt; )B5(V5-!|  
  BOOL m_bShift; e%v0EJ},  
  CString m_Path; FS6I?q#tQ  
  CString m_Number; |&\cr\T\r  
  //}}AFX_DATA l1D"*J 2`  
  // ClassWizard generated virtual function overrides DTM xfQdk  
  //{{AFX_VIRTUAL(CCaptureDlg) J85Kgd1 \a  
 public: W%P0X5YQ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Qh,Dcg2ZM"  
 protected: z1~FE  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  F!&_  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); h2mU  
  //}}AFX_VIRTUAL m95;NT1N/g  
  // Implementation y3NMt6  
 protected: W=?s-*F[~  
  HICON m_hIcon;  nCSXvd/  
  // Generated message map functions -LMO f?  
  //{{AFX_MSG(CCaptureDlg) %( o[H sl  
  virtual BOOL OnInitDialog(); E@S5|CM  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); )jaNFJ 3  
  afx_msg void OnPaint(); /r mm@  
  afx_msg HCURSOR OnQueryDragIcon(); \I~9%QJ>  
  virtual void OnCancel(); TDjjaO  
  afx_msg void OnAbout(); ?G$X 4KY6`  
  afx_msg void OnBrowse(); tCbn B  
  afx_msg void OnChange(); I cz) Qtg|  
 //}}AFX_MSG f*GdHUZ*  
 DECLARE_MESSAGE_MAP() S0-/9h  
}; he1OLk  
#endif ]x`I@vSf7R  
O{44GB3  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 2a[_^v $v  
#include "stdafx.h" 6>; dJV  
#include "Capture.h" x2 m A  
#include "CaptureDlg.h" '3V?M;3|K  
#include <windowsx.h> bhc .UmH  
#pragma comment(lib,"hook.lib") ]2'{W]m  
#ifdef _DEBUG rd4\N2- 6  
#define new DEBUG_NEW @Z%I g  
#undef THIS_FILE h?2:'Vu]  
static char THIS_FILE[] = __FILE__; OA\ *)c+F  
#endif bF{14F$  
#define IDM_SHELL WM_USER+1 o&vODs  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); eWwI@ASaA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `Pe WV[?  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; *kWrF* )J  
class CAboutDlg : public CDialog B:QAG  
{ *Wmn!{\g  
 public: YF(TG]?6  
  CAboutDlg(); UXN!iU)  
  // Dialog Data 7s-ZRb[)1  
  //{{AFX_DATA(CAboutDlg) UkV{4*E  
  enum { IDD = IDD_ABOUTBOX }; )4/227b/(  
  //}}AFX_DATA @Zd/>'  
  // ClassWizard generated virtual function overrides CkA ~'&C  
  //{{AFX_VIRTUAL(CAboutDlg) 4Js9"<w  
 protected: [MVG\6Up(  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #.z`clK#  
  //}}AFX_VIRTUAL YQk<1./}I  
  // Implementation SUQk0 (M  
 protected: ??.9`3CYo  
  //{{AFX_MSG(CAboutDlg) 7Yrp#u1!  
  //}}AFX_MSG tlz)V1L  
  DECLARE_MESSAGE_MAP() K=mW`XXup  
}; WQT;k0;T]  
_N&]w*ce  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) m?=9j~F *  
{ rxJWU JMxK  
 //{{AFX_DATA_INIT(CAboutDlg) }n91aE3v  
 //}}AFX_DATA_INIT ;wkoQ8FD9  
} WSPlM"h  
`&-)(#  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) yhi6RDS  
{ 235wl  
 CDialog::DoDataExchange(pDX); X #!oG)or  
 //{{AFX_DATA_MAP(CAboutDlg) ~Q)137u]P  
 //}}AFX_DATA_MAP ]rP'\a  
} (o5+9'y"9  
umD[4aP~;  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) !\%0O`b^4  
 //{{AFX_MSG_MAP(CAboutDlg) 8=h$6=1S  
 // No message handlers :Sj r  
 //}}AFX_MSG_MAP 0aS&!"o!  
END_MESSAGE_MAP() JZ  
*l-(tp5  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) )FfJ%oT}  
: CDialog(CCaptureDlg::IDD, pParent) NhDM h8=$^  
{ :jp4 !0w  
 //{{AFX_DATA_INIT(CCaptureDlg) M;i4ss,}!  
  m_bControl = FALSE; x>yeF,q1  
  m_bAlt = FALSE; 8O5@FU 3  
  m_bShift = FALSE; _4VS.~}/R  
  m_Path = _T("c:\\"); )~X*&(7RR}  
  m_Number = _T("0 picture captured."); O]Mz1 ev|  
  nCount=0; 4&c7^ 4w~  
  bRegistered=FALSE; Tpv]c  
  bTray=FALSE; 1li1&  
 //}}AFX_DATA_INIT !Y3 *\  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 K{)YnY_E;  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); V\V:uo(C  
} ] EzX$T  
?/,sKF74i  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) dU~DlaEy(  
{ Fq<;-  
 CDialog::DoDataExchange(pDX);  p|D-ez8  
 //{{AFX_DATA_MAP(CCaptureDlg) `jur`^S|  
  DDX_Control(pDX, IDC_KEY, m_Key); {,|J?>{  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); #!%\97ZR  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 3 #zw Y  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Y C uuj$  
  DDX_Text(pDX, IDC_PATH, m_Path); |# zznT"  
  DDX_Text(pDX, IDC_NUMBER, m_Number); +I?T|Iin  
 //}}AFX_DATA_MAP u$ZahN!  
} D* oJz3[  
\y%:[g}Fvw  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) @YEdN}es  
//{{AFX_MSG_MAP(CCaptureDlg) ]qJ6#sAw75  
 ON_WM_SYSCOMMAND() ]c8O"4n n  
 ON_WM_PAINT() `euk&]/^.)  
 ON_WM_QUERYDRAGICON() +=y ktf  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ;b""N,  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) T F!Lp:  
 ON_BN_CLICKED(ID_CHANGE, OnChange) U 6y ;V  
//}}AFX_MSG_MAP U-$ B"w&  
END_MESSAGE_MAP() l|[8'*]r!  
2HNH@K  
BOOL CCaptureDlg::OnInitDialog() $z9z'^HqO  
{ b (,X3x*  
 CDialog::OnInitDialog(); K_J o^BZ  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Xj\SJ*  
 ASSERT(IDM_ABOUTBOX < 0xF000); pEjA*6v|,  
 CMenu* pSysMenu = GetSystemMenu(FALSE); i8`&XGEd  
 if (pSysMenu != NULL) 3huT T"G  
 { bm{L6D E  
  CString strAboutMenu; 6c3+q+#J2  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ZcXqH7`r  
  if (!strAboutMenu.IsEmpty()) U~SOHfZ%(  
  { =%:mZ@x'  
   pSysMenu->AppendMenu(MF_SEPARATOR); }@pe `AF^  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); _J51 :pi  
  } HHbkR2H1  
 } ms8PFu(f  
 SetIcon(m_hIcon, TRUE); // Set big icon r"a4 ;&mf  
 SetIcon(m_hIcon, FALSE); // Set small icon }31z 35  
 m_Key.SetCurSel(0); <mc[-To  
 RegisterHotkey(); MK]S205{  
 CMenu* pMenu=GetSystemMenu(FALSE); }{^i*T5rl  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); {.We%{4V  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 1R/=as,R  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); -4JdK O  
 return TRUE; // return TRUE unless you set the focus to a control 9Q".166  
} >s E5zj|V  
wR;_x x  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]FLuiC  
{ W"mkNqH  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) %$ ^yot  
 { edPnC {?s  
  CAboutDlg dlgAbout; >9f-zv(n  
  dlgAbout.DoModal(); c FjC  
 } 8VLr*83~8  
 else 7oPBe1P,K+  
 { K5Fzmo a  
  CDialog::OnSysCommand(nID, lParam); w+cI0lj  
 } C!SB5G>OH  
} P X](hc=  
$S$%avRX  
void CCaptureDlg::OnPaint() GA6)O-^G  
{ 0\AYUa?RM  
 if (IsIconic()) 31|Vb  
 { ZYBNS~Q  
  CPaintDC dc(this); // device context for painting :L9\`&}FS  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); J#CF SG  
  // Center icon in client rectangle Nuk\8C  
  int cxIcon = GetSystemMetrics(SM_CXICON); n<7#?X7  
  int cyIcon = GetSystemMetrics(SM_CYICON); |B4dFI?  
  CRect rect; s&vOwPmV  
  GetClientRect(&rect); 4qjY,QJ  
  int x = (rect.Width() - cxIcon + 1) / 2; aO'$}rDf$  
  int y = (rect.Height() - cyIcon + 1) / 2; K:P gkc  
  // Draw the icon nF}]W14x  
  dc.DrawIcon(x, y, m_hIcon); bt#=p 7 W  
 } 3Nw9o6`U  
 else qO>BF/)a(  
 { p`{9kH1me  
  CDialog::OnPaint(); @ky5X V  
 } ms3Ec`i9  
} }?>30+42:  
<"CG%RGP  
HCURSOR CCaptureDlg::OnQueryDragIcon() CN: 36  
{ l4u`R(!n5  
 return (HCURSOR) m_hIcon; TA}gCXE e  
} g<KBsz!{  
fCZbIt)Eh  
void CCaptureDlg::OnCancel() kvSSz%R~  
{ R^dAwt`.D  
 if(bTray) [ OMcSd|nf  
  DeleteIcon(); Tb}`]Y`X  
  CDialog::OnCancel(); G?=X!up(  
} ^']xkS  
^fS~va  
void CCaptureDlg::OnAbout() 1NN99^ q  
{ ~|Gtm[9Ru  
 CAboutDlg dlg; F:IG3 @  
 dlg.DoModal(); 5@Ot@o  
} 8*4X%a=Of  
E+>Qpy  
void CCaptureDlg::OnBrowse() v2JC{XqrI  
{ &bs/a] ?Z7  
 CString str; +Medu?K `  
 BROWSEINFO bi; aQ]C`9k  
 char name[MAX_PATH]; *"O7ml]  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Q>JJI:uC4  
 bi.hwndOwner=GetSafeHwnd(); h3>/..l  
 bi.pszDisplayName=name; s+C&\$E  
 bi.lpszTitle="Select folder"; }LDDm/$^}  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; [)# ,~L3  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); @\z2FJ79w  
 if(idl==NULL) :s$ rD  
  return; #{UM4~|:  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); )@\= pE.H  
 str.ReleaseBuffer(); a0CmCv2#  
 m_Path=str; wb.47S8  
 if(str.GetAt(str.GetLength()-1)!='\\') &JtK<g  
  m_Path+="\\"; -fT]}T6=  
 UpdateData(FALSE); d*3k]Ie%5f  
} M7fw/i  
xQ^zX7  
void CCaptureDlg::SaveBmp() R4]t D|  
{ +/-#yfn!TR  
 CDC dc; vtv|H  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); *(PGL YK  
 CBitmap bm; lBgf' b3$  
 int Width=GetSystemMetrics(SM_CXSCREEN); Zh6bUxr  
 int Height=GetSystemMetrics(SM_CYSCREEN); /al(=zf  
 bm.CreateCompatibleBitmap(&dc,Width,Height); g"FG7E&  
 CDC tdc; M`9qo8zCi  
 tdc.CreateCompatibleDC(&dc); `QnKal)  
 CBitmap*pOld=tdc.SelectObject(&bm); '_@Y  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); [ C,<Q  
 tdc.SelectObject(pOld); m5v9:5{  
 BITMAP btm; ~kD/dXt  
 bm.GetBitmap(&btm); xw&[ 9}Y  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; SirjWYap  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); nws '%MK)  
 BITMAPINFOHEADER bih; %r=uS.+hrF  
 bih.biBitCount=btm.bmBitsPixel; A{bt Z#k  
 bih.biClrImportant=0; F@& R"-  
 bih.biClrUsed=0; " 2Dz5L1v  
 bih.biCompression=0; 1j`-lD  
 bih.biHeight=btm.bmHeight; [V|,O'X ~  
 bih.biPlanes=1; O={4 >>F  
 bih.biSize=sizeof(BITMAPINFOHEADER); C},;M @xV  
 bih.biSizeImage=size; xdd7OSc0{  
 bih.biWidth=btm.bmWidth; V}. uF,>V  
 bih.biXPelsPerMeter=0; &na#ES $X,  
 bih.biYPelsPerMeter=0; =!w5%|r.  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 6iV jAxR  
 static int filecount=0; Kyt.[" p  
 CString name; ug'I:#@2  
 name.Format("pict%04d.bmp",filecount++); x1:+M]Da  
 name=m_Path+name; Kfa7}f_  
 BITMAPFILEHEADER bfh; OL4I}^*,  
 bfh.bfReserved1=bfh.bfReserved2=0; `KqMcAW  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ng0IRJ:3  
 bfh.bfSize=54+size; h$F;=YS   
 bfh.bfOffBits=54; 6vbWe@#U/  
 CFile bf; an_qE}P  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ MqGF~h|+  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); K{.s{;#  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); O$k;p<?M  
  bf.WriteHuge(lpData,size); 1t_$pDF}  
  bf.Close(); T]Gxf"mK  
  nCount++; vA2@Db}  
 } *:J#[ET,  
 GlobalFreePtr(lpData); %Koc^ pb)  
 if(nCount==1) ?VrZM  
  m_Number.Format("%d picture captured.",nCount); jb~a z  
 else w$n\`rQ  
  m_Number.Format("%d pictures captured.",nCount); t j&+HC  
  UpdateData(FALSE); )SQ*"X4"  
} / d=i 0E3  
)67_yHW  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 0#lw?sv  
{ *vc=>AEc  
 if(pMsg -> message == WM_KEYDOWN) .j:.?v  
 { +Mc kR  
  if(pMsg -> wParam == VK_ESCAPE) 3v)v92;  
   return TRUE; DeE-M"  
  if(pMsg -> wParam == VK_RETURN) !4GG q  
   return TRUE; `*cT79  
 } }ddwL  
 return CDialog::PreTranslateMessage(pMsg); 0@d)DLM?  
} A"x1MjuqLM  
4o8uWS{`  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #gq4%;  
{ .yE!,^j.gB  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Ug_5INK  
  SaveBmp(); ,C2qP3yg  
  return FALSE; JYL/p9K[I  
} :-ZE~b HJ  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 0JQy-hpF  
 CMenu pop; Gc>bli<-  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); WJ=DTON  
 CMenu*pMenu=pop.GetSubMenu(0); 4b=hFwr[?  
 pMenu->SetDefaultItem(ID_EXITICON); ?Y+xuY/t  
 CPoint pt; a]'sby  
 GetCursorPos(&pt); S>O fUrt  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); }1]/dCv  
 if(id==ID_EXITICON) 4[a?. .X  
  DeleteIcon(); Q W#]i  
 else if(id==ID_EXIT) # eqt{  
  OnCancel(); WXu:mv,'e  
 return FALSE; fiOc;d8  
} pA)!40kz  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Yh_H $uW  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 4*MjDb  
 AddIcon(); #P*%FgROl  
 return res; Uov%12  
} P7QOlTQI  
>JwdVy^  
void CCaptureDlg::AddIcon() v1<gNb)`  
{ }qmBn`3R  
 NOTIFYICONDATA data; =BQM(mal  
 data.cbSize=sizeof(NOTIFYICONDATA); {9U<!  
 CString tip; BM=`zGh"  
 tip.LoadString(IDS_ICONTIP); 0fA42*s;  
 data.hIcon=GetIcon(0); JPfNf3<@My  
 data.hWnd=GetSafeHwnd(); '<~rV  
 strcpy(data.szTip,tip); QEL^0c8~  
 data.uCallbackMessage=IDM_SHELL; (1H_V(  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; yLCqlK  
 data.uID=98; - {<`Z  
 Shell_NotifyIcon(NIM_ADD,&data); [:sPZ{  
 ShowWindow(SW_HIDE); !t "uNlN  
 bTray=TRUE; B%gk[!d}8  
} ms'&.u&<  
iz]Vb{5n%  
void CCaptureDlg::DeleteIcon() b\NWDH7}  
{ #<f}.P.Uc  
 NOTIFYICONDATA data; H6E@C}cyM  
 data.cbSize=sizeof(NOTIFYICONDATA); 6-va;G9Fc  
 data.hWnd=GetSafeHwnd(); S!.aBAW  
 data.uID=98; GlP [:  
 Shell_NotifyIcon(NIM_DELETE,&data); ?GqFtNz  
 ShowWindow(SW_SHOW); .B*Yg<j  
 SetForegroundWindow(); Pd!;z=I  
 ShowWindow(SW_SHOWNORMAL); 4 q}1  
 bTray=FALSE; vLR)B@O,2  
} (y|{^@  
;y<)RM  
void CCaptureDlg::OnChange() idnn%iO  
{ SF+ ^dPwj  
 RegisterHotkey(); 1Uz'= a  
} vM~/|)^0sW  
8=gr F  
BOOL CCaptureDlg::RegisterHotkey() k/AcXU%O+  
{ @iB**zR/  
 UpdateData(); wOE_2k  
 UCHAR mask=0; _/ j44q  
 UCHAR key=0; Hf+A52lrf  
 if(m_bControl) Y>t*L#i  
  mask|=4; Noz+\O\  
 if(m_bAlt) $m:}{:LDCf  
  mask|=2; 3Zg=ZnF  
 if(m_bShift) G+4a%?JH  
  mask|=1; 9 U1)sPH;  
  key=Key_Table[m_Key.GetCurSel()]; G39H@@ *O0  
 if(bRegistered){ FMY r6/I  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); JiZ9ly( G  
  bRegistered=FALSE; -qfd)A6]  
 } %s$_KG!&  
 cMask=mask; n-,~Bp [  
 cKey=key; GW'=/ z7  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); iJ42` 51  
 return bRegistered; _jH1Mcq  
}  &N0W!  
q "bpI8j  
  四、小结 l,h#RTfry  
WP32t@  
  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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