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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: nB%;S  
  7SlsnhpW  
  一、实现方法 +Vo}F  
qOSg!aft{Q  
  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: J 8M$k/"X  
Zm"{Viv]  
#pragma data_seg("shareddata") ndjx|s)E  
HHOOK hHook =NULL; //钩子句柄 5Xl /L  
UINT nHookCount =0; //挂接的程序数目 NE/m-ILw  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 "Fy7K#n  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 0O\SU"bP  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ZDD..j  
static int KeyCount =0; {%VV\qaC  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 [zL7Q^~  
#pragma data_seg() Tneq6>  
JC}f-%H?K  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 A a= u+  
t~E<j+<2B  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: Z.W66\8~}^  
s[K^9wz  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR RlqQ  
cKey,UCHAR cMask) ~by]xE1Eg  
{ UOGuqV-  
 BOOL bAdded=FALSE; :l2g#* c  
 for(int index=0;index<MAX_KEY;index++){ 1iX)d)(b  
  if(hCallWnd[index]==0){ /,MJq#@K  
   hCallWnd[index]=hWnd; s:2|c]wQ#R  
   HotKey[index]=cKey; JCPUM *g8  
   HotKeyMask[index]=cMask;  t^xTFn  
   bAdded=TRUE; UK$ms~H  
   KeyCount++; `6[I^qG".  
   break; J[A14z]#`  
  } eVt$7d?Jw  
 } aWwPvd3  
 return bAdded; _bzqd" 31I  
} a@@M+9Q  
//删除热键 21ppSN >  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }w/;){gu  
{ Iq#ZhAk  
 BOOL bRemoved=FALSE; h)6GaJ=  
 for(int index=0;index<MAX_KEY;index++){ *\wp?s>-t  
  if(hCallWnd[index]==hWnd){ d{3@h+zL  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ '8 fk+>M  
    hCallWnd[index]=NULL; $`8Ar,Xz`  
    HotKey[index]=0; E,wVe[0)f  
    HotKeyMask[index]=0; /^$UhX9v  
    bRemoved=TRUE; 5aBAr  
    KeyCount--; A%Xt|=^_  
    break; Fi. aC;sx  
   } Ul_M3"Z  
  } 9U {y1}  
 } 28hHabd|  
 return bRemoved; d\H&dkpH  
} gP-nluq  
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  DLL中的钩子函数如下: q;fKcblKj  
Io|X#\K  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) g ^!C  
{ L>!8YUz7p$  
 BOOL bProcessed=FALSE; TDg@Tg0  
 if(HC_ACTION==nCode) :qR=>n=  
 { !PMU O\y  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 6oinidB[l  
   switch(wParam) ~XydQJ^*  
   {  9D 0dg(  
    case VK_MENU: -UZ@G~K  
     MaskBits&=~ALTBIT; F,GN[f-  
     break; 4D$;KokZ  
    case VK_CONTROL: g|Y] wd  
     MaskBits&=~CTRLBIT; tM,%^){p$  
     break; ' JdkUhq1V  
    case VK_SHIFT: WKpA|  
     MaskBits&=~SHIFTBIT; `gpQW~*R-;  
     break; ExSO|g]%  
    default: //judge the key and send message `e]6#iJ^  
     break; 7l."b$U4yv  
   } !ph" mf$-  
   for(int index=0;index<MAX_KEY;index++){ (>=7ng^  
    if(hCallWnd[index]==NULL) 2/36dGFH  
     continue; 0Rz(|jlbS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) j'HkBW:L  
    { "o&HE@t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); n;8'`s  
     bProcessed=TRUE; K9[e>  
    } wQ+dJ3b$  
   } b?Pj< tA  
  } -h-oMqgu(  
  else if((lParam&0xc000ffff)==1){ //有键按下 ,&7Wa-vf  
   switch(wParam) G\/"}B:(  
   { mmEp'E  
    case VK_MENU: 1/ZR*f a  
     MaskBits|=ALTBIT; 451'>qS  
     break; ?-OPX_i_  
    case VK_CONTROL: ~=&t0D  
     MaskBits|=CTRLBIT; #.5vC5  
     break; y/? &pKH^  
    case VK_SHIFT: SQWafD  
     MaskBits|=SHIFTBIT; J4 tcQ  
     break; r7]"?#  
    default: //judge the key and send message mxFn7.|r~  
     break; 1ndJ+H0H  
   } w %c  
   for(int index=0;index<MAX_KEY;index++){ maSgRf[g  
    if(hCallWnd[index]==NULL) 'P laMOy  
     continue; 4'Xgk8)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C;Ic  
    { J$9:jE-4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); u/Fj'*M  
     bProcessed=TRUE; V &Mf:@y  
    } .5> 20\b2  
   } Nf9fb?  
  } y69J%/c ra  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 +m,!e*g  
   for(int index=0;index<MAX_KEY;index++){ ?@R")$  
    if(hCallWnd[index]==NULL) p|XAlia  
     continue; 8I+d)(:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) LS.r%:$mb  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); K(T\9J.  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 'GJVWpvUU  
   } MR'o{?{e`  
  } n&-496H  
 } *~z#.63oZ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); DB`QsiC)  
} zzZg$9PT[  
]M,06P>?  
  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: wk\L*\@Y}  
% do1i W  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h4fLl3%H  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \k.vN@K#  
~ eN8|SR  
  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: C:\(~D *GS  
$v} <'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Ulqh@CE)  
{ $_j1kx$  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ujgLJ77  
 { qJ8-9^E,L  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 oP,9#FC|(  
  SaveBmp(); t7F.[uWD  
  return FALSE; !0 Q8iW:  
 } xi'<y  
 …… //其它处理及默认处理 8NimZ(  
} Mth6-^g5  
dL;HV8z^  
FN )d1q(~  
  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。 (paf2F`~#  
S7n"3.k  
  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。 X)uDSI~  
q42FP q  
  二、编程步骤 ua 8m;>R  
FUeq \Wuo  
  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"; *+lsZ8'^C  
gs`^~iD]m  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ~%y\@x7I  
Pg^h,2h  
  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; }X$l\pm  
$W!]fcZlB  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; . %(^mK)zQ  
<9@7,2  
  5、 添加代码,编译运行程序。 S2=%x.  
0^_MN~s(X  
三、程序代码 C|z%P}u#p  
#i@h{ R01  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 6Dm+'y]l  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) IG.f=+<0  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ E`p'L!z  
#if _MSC_VER > 1000 f =_^>>.  
#pragma once _|n=cC4Qu  
#endif // _MSC_VER > 1000 U6WG?$x  
#ifndef __AFXWIN_H__ rS~qi}4X  
#error include 'stdafx.h' before including this file for PCH VEh]p5D  
#endif PHR#>ZD  
#include "resource.h" // main symbols +cfziQ$'  
class CHookApp : public CWinApp JmWR{du  
{ #q4*]qGHm  
 public: =B5E0x  
  CHookApp(); 0B3 Q Vbp'  
  // Overrides C;#" td  
  // ClassWizard generated virtual function overrides L :U4N*  
  //{{AFX_VIRTUAL(CHookApp) ^o%_W0_r  
 public: fuSq ={]  
  virtual BOOL InitInstance(); /GsrGX8  
  virtual int ExitInstance(); ;9rTE|n  
  //}}AFX_VIRTUAL jmW^`%;7  
  //{{AFX_MSG(CHookApp) ~Q!~eTw  
  // NOTE - the ClassWizard will add and remove member functions here. B!q?_[k,  
  // DO NOT EDIT what you see in these blocks of generated code ! ` py}99G  
  //}}AFX_MSG Ysk, w,K  
  DECLARE_MESSAGE_MAP() pv$tTWk  
}; )|T`17-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); p~>_T7ze  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {'(ej5,6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \JU ~k5j  
BOOL InitHotkey(); h=f6~5l5  
BOOL UnInit(); _O 52ai><b  
#endif oMTY)`me  
ZDlu1>Q  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. PHkDb/HIx|  
#include "stdafx.h" ?Y`zg`  
#include "hook.h" A c:\c7M;  
#include <windowsx.h>  Rkv  
#ifdef _DEBUG >6K4b/.5w  
#define new DEBUG_NEW m'.T2e.u  
#undef THIS_FILE 4]"w b5%  
static char THIS_FILE[] = __FILE__; y''0PSfb#  
#endif <lx^aakk!  
#define MAX_KEY 100 X\G)81Q.S  
#define CTRLBIT 0x04 xT+ ;w[s  
#define ALTBIT 0x02 Z}f^qc+  
#define SHIFTBIT 0x01 C5B=NAc  
#pragma data_seg("shareddata") Dh8(HiXf:  
HHOOK hHook =NULL; _SF!T6A  
UINT nHookCount =0; XWF7#xM  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey JFJIls  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT oQBiPN+v.3  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 1,u{&%yL"w  
static int KeyCount =0; QJM(UfHUD  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift n `#+L~X  
#pragma data_seg() z\h, SX<U  
HINSTANCE hins; W8uVd zQ   
void VerifyWindow(); qj;l,Kua  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) {3 SdX  
//{{AFX_MSG_MAP(CHookApp) {fElto   
// NOTE - the ClassWizard will add and remove mapping macros here. )v-Cj_W5]"  
// DO NOT EDIT what you see in these blocks of generated code! x#o?>5Qg?  
//}}AFX_MSG_MAP ;E2~L  
END_MESSAGE_MAP() P7Z<0Dt\}  
T:)% P6/  
CHookApp::CHookApp() ._K$0U!  
{ RR'(9QJ$  
 // TODO: add construction code here, E~69^ cd  
 // Place all significant initialization in InitInstance 0Ts!(b]B  
} s9:%s*$u  
l) iv\j  
CHookApp theApp; ^OjvL6 A/p  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %d-`71|lG^  
{ <dJIq"){  
 BOOL bProcessed=FALSE; CMKhS,,o  
 if(HC_ACTION==nCode) 9M0d+:YJ  
 { 7Ff?Ysr  
  if((lParam&0xc0000000)==0xc0000000){// Key up Ahd\TH  
   switch(wParam) G/%Ubi6%  
   { B^Bbso'{1  
    case VK_MENU: I-,Xwj-  
     MaskBits&=~ALTBIT; \ j x0ZHR  
     break; I<9n(rA  
    case VK_CONTROL: ){jqfkL  
     MaskBits&=~CTRLBIT; J(&Gmk9&  
     break; S].Ft/+H  
    case VK_SHIFT: sk\_[p  
     MaskBits&=~SHIFTBIT; "h`54 }0  
     break; # s,Y% Bce  
    default: //judge the key and send message _p$"NNFN  
     break; HcDyD0;L.  
   } "sSjVu  
   for(int index=0;index<MAX_KEY;index++){ S--/<a2  
    if(hCallWnd[index]==NULL) u& AQl.u  
     continue; qU}lGf!dVn  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U"/yB8!W  
    { ,?t}NZY&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1riBvBT  
     bProcessed=TRUE; ;4R =eI  
    } HUD7{6}4  
   } mC% %)F'Zf  
  } ;*"!:GR%h  
  else if((lParam&0xc000ffff)==1){ //Key down ''%;EW>  
   switch(wParam) *u<rU,C8  
   { %h3L  
    case VK_MENU: k>$FT `  
     MaskBits|=ALTBIT; EI%M Azj}  
     break; =]WW'~  
    case VK_CONTROL: k62$:9`5  
     MaskBits|=CTRLBIT; QR|XV%$  
     break; %f>X-*}NI-  
    case VK_SHIFT: 2z[r@}3  
     MaskBits|=SHIFTBIT; n=;';(wR[  
     break; D8q3TyCj%  
    default: //judge the key and send message Rd .U;>  
     break; ;K>{_k f  
   } )A"ZV[eOoQ  
   for(int index=0;index<MAX_KEY;index++) XX*'N+  
   { e!.7no  
    if(hCallWnd[index]==NULL) rL.<Z@ -  
     continue; ^l&nB.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B-B?Ff>  
    { `WP@ZSC6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); >a?OXqYP  
     bProcessed=TRUE; [vZfH!vLP  
    } 9"[!EKW  
   } wxH (&CB-{  
  } -B<O_*wOj  
  if(!bProcessed){ `WraOsoY  
   for(int index=0;index<MAX_KEY;index++){ >cBGw'S  
    if(hCallWnd[index]==NULL) cZCGnzy  
     continue; U)SM),bE[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *4r s  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9k714bnMLX  
   } 03P N{<  
  } ?"5~Wwp.T  
 } }R7sj  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \.K\YAM<  
} eL]{#WL  
BUcaj.S  
BOOL InitHotkey() h9tB''ePE  
{ oV%( 37W9=  
 if(hHook!=NULL){ Gr`MGQ,  
  nHookCount++; ?Ry%c6(}  
  return TRUE; ?ZSXoy-kr  
 } <O <'1uO,  
 else 6ctHL<^  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); a7XXhsZ  
  if(hHook!=NULL) Xtu:  
   nHookCount++; /%N31   
  return (hHook!=NULL); ws*~$x?7  
} L?Kz P.(t+  
BOOL UnInit() (#f m (@T  
{ r78u=r  
 if(nHookCount>1){ }:,o Y<  
  nHookCount--; "R@$Wu53|  
  return TRUE; >reaIBT  
 } B FzcoBu-  
 BOOL unhooked = UnhookWindowsHookEx(hHook); $[HcHnf  
 if(unhooked==TRUE){ 5`1(}  
  nHookCount=0; +YGw4{\EL  
  hHook=NULL; _A@fP[C  
 } zhVa.r A  
 return unhooked; G\'u~B/w  
} ` <l/GwtAJ  
2eZk3_w  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) PfwI@%2  
{ $V`KrA~]  
 BOOL bAdded=FALSE; .}L-c>o"o  
 for(int index=0;index<MAX_KEY;index++){ &cv@Kihq(  
  if(hCallWnd[index]==0){ 0U>t>&,"  
   hCallWnd[index]=hWnd; *` @XKK  
   HotKey[index]=cKey; %a)0?U  
   HotKeyMask[index]=cMask; (T>?8 K _d  
   bAdded=TRUE; FUW(>0x?  
   KeyCount++; xA[Wb'  
   break; BR&Qw'O%  
  } N$=(1`zM=  
 } ;~'cITL  
 return bAdded; )vEHLp.  
} rL!_&|  
4~m.#6MT  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) cu.*4zs  
{ 4Vb}i[</  
 BOOL bRemoved=FALSE; 6b#:H~ <  
 for(int index=0;index<MAX_KEY;index++){ zkT`] @`J  
  if(hCallWnd[index]==hWnd){ SIaUrC  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ '[M^f+H|  
    hCallWnd[index]=NULL; '%n<MTL  
    HotKey[index]=0; w (vE2Y ?  
    HotKeyMask[index]=0; ,w9#%=xE  
    bRemoved=TRUE; O X5Co <u  
    KeyCount--; zAkc 67:  
    break; `wn<3#  
   } 0i5T] )r  
  } a=:{{\1o  
 } 5v Uz  
 return bRemoved; |1<]o;:  
} xzMeKC `  
D^N#E>,  
void VerifyWindow() K#JabT  
{ Cu ['&_@  
 for(int i=0;i<MAX_KEY;i++){ +qh< Fj>  
  if(hCallWnd!=NULL){ !BvTJ-e)F  
   if(!IsWindow(hCallWnd)){ ,E/Y@sajn+  
    hCallWnd=NULL; r {/ G\  
    HotKey=0; LEn=dU  
    HotKeyMask=0; O$<%z[  
    KeyCount--; ')~Y  
   } M<#)D  
  } q5'yD;[hE  
 } `lu"yF  
} +s/N@]5nW  
sw=JUfAhy  
BOOL CHookApp::InitInstance() qmue!Fv#g  
{ ]@ Sc}  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); "&~?Hzm  
 hins=AfxGetInstanceHandle(); 5Sm5jRr  
 InitHotkey(); Tjeo*n^  
 return CWinApp::InitInstance(); |;U}'|6  
} #^4>U&?  
MW",r;l<aM  
int CHookApp::ExitInstance() H.l,%x&K  
{ :EQme0OW  
 VerifyWindow(); dm/\uE'l  
 UnInit(); Hl3XqR  
 return CWinApp::ExitInstance(); j J`Zz  
} .5KC'?  
xM'S ;Sg  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file N?2 #YTjR  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) U Qi^udGFD  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ t6h`WAZV  
#if _MSC_VER > 1000 %!HnGwv-  
#pragma once SILvqm  
#endif // _MSC_VER > 1000 Ip7FD9 ^  
|U#w?eE=  
class CCaptureDlg : public CDialog HgSmAziv  
{ >Xh(`^}SQ*  
 // Construction )-6s7  
 public: '4^V4i  
  BOOL bTray; _;J9q}X  
  BOOL bRegistered; a7v[l04  
  BOOL RegisterHotkey(); lM|WOmD  
  UCHAR cKey; @7HOL-i  
  UCHAR cMask; %.Tf u0M  
  void DeleteIcon(); {YKMQI^O/  
  void AddIcon(); \9|]  
  UINT nCount; {Hp}F!X$  
  void SaveBmp(); NBg>i7KQ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor -t~B@%  
  // Dialog Data 8SCW.;0  
  //{{AFX_DATA(CCaptureDlg) <Z_wDK/UR  
  enum { IDD = IDD_CAPTURE_DIALOG }; Hdq/E>u  
  CComboBox m_Key; U@v8H!p^i  
  BOOL m_bControl; yd2qf  
  BOOL m_bAlt; |`(?<m  
  BOOL m_bShift; dE}b8|</  
  CString m_Path; Y="&|c=w#L  
  CString m_Number; fD#&:)  
  //}}AFX_DATA ap'kxOf"1  
  // ClassWizard generated virtual function overrides A_(+r  
  //{{AFX_VIRTUAL(CCaptureDlg) _E&vE5<-$  
 public: Am0.c0h  
  virtual BOOL PreTranslateMessage(MSG* pMsg); "! 6 B5Oz  
 protected: @Z=|$*9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support i!d7,>l+Q~  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 7 NB"oU^h%  
  //}}AFX_VIRTUAL P15 *VPy  
  // Implementation g7U:A0Z  
 protected: !NAX6m  
  HICON m_hIcon; 7f\^VG  
  // Generated message map functions J2 rLsNC]0  
  //{{AFX_MSG(CCaptureDlg) =<'iLQb1  
  virtual BOOL OnInitDialog(); 0rm;)[SjF  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); b gc<)=  
  afx_msg void OnPaint(); ;~@PYIp  
  afx_msg HCURSOR OnQueryDragIcon(); ~oW8GQ  
  virtual void OnCancel(); DN 8pJa  
  afx_msg void OnAbout(); &!YH"{b  
  afx_msg void OnBrowse(); qnfRN'  
  afx_msg void OnChange(); A%m `LKV~@  
 //}}AFX_MSG J,=E5T}U^  
 DECLARE_MESSAGE_MAP() hTtp-e`   
}; ='bmjXu  
#endif !VJa$>,  
x"wM_hl5L  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file \lbiz4^>  
#include "stdafx.h" \IZ4( Z  
#include "Capture.h" Tvx8l m '  
#include "CaptureDlg.h" (&]15 FJ$1  
#include <windowsx.h> &G,o guo  
#pragma comment(lib,"hook.lib") 6 % y)  
#ifdef _DEBUG / ?[gB:s  
#define new DEBUG_NEW wCTR-pL^  
#undef THIS_FILE iBiA0 W  
static char THIS_FILE[] = __FILE__; 5B.??;xtaV  
#endif W7[ S7kd  
#define IDM_SHELL WM_USER+1 $9_.Q/9>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $}UJs <-F  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ihBl",l&Hq  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; <:{[Zvl'k  
class CAboutDlg : public CDialog ?a0}^:6  
{ +e]b,9.sR  
 public: +$= Wms-z  
  CAboutDlg(); ylxfh(  
  // Dialog Data }.$ B1%2  
  //{{AFX_DATA(CAboutDlg) Lr\ B  
  enum { IDD = IDD_ABOUTBOX }; o>A%}YU  
  //}}AFX_DATA !g&B)0u]*  
  // ClassWizard generated virtual function overrides So 6cm|{  
  //{{AFX_VIRTUAL(CAboutDlg) UlN|Oy,  
 protected: &CmkNm_B  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support GN;XB b]w  
  //}}AFX_VIRTUAL =i5:*J  
  // Implementation UuqnL{  
 protected: 8kc'|F\  
  //{{AFX_MSG(CAboutDlg) rH:X/i;D  
  //}}AFX_MSG /~rO2]rZ@  
  DECLARE_MESSAGE_MAP() [pWDhY  
}; l/UG+7  
e(\S,@VN2  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) qf=[*ZY  
{ pVa|o&,  
 //{{AFX_DATA_INIT(CAboutDlg) 8B t-  
 //}}AFX_DATA_INIT JiLrwPex[  
} jp]geV54  
R"t$N@ZFb  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) '/*c Yv45  
{  ~0'l,  
 CDialog::DoDataExchange(pDX); IIn\{*|mW  
 //{{AFX_DATA_MAP(CAboutDlg) x15tQb+  
 //}}AFX_DATA_MAP r~2@#gTbl  
} ZznWs+  
7%}3Ghc%  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Ng39D#_)  
 //{{AFX_MSG_MAP(CAboutDlg) f EiEfu  
 // No message handlers +;iesULXn  
 //}}AFX_MSG_MAP :(p rx   
END_MESSAGE_MAP() <({eOh5 N  
.F3LA6se  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %1 ^jd\  
: CDialog(CCaptureDlg::IDD, pParent) m.a1  
{ 5a_!&  
 //{{AFX_DATA_INIT(CCaptureDlg) l<: E+lU  
  m_bControl = FALSE; JI,hy <3l0  
  m_bAlt = FALSE; .*f4e3  
  m_bShift = FALSE; kpw4Mq@  
  m_Path = _T("c:\\"); W!B4< 'Fjc  
  m_Number = _T("0 picture captured."); wP':B AQ4U  
  nCount=0; 2^ZPO4|  
  bRegistered=FALSE; "#k(V=y  
  bTray=FALSE; &8i{'k,l  
 //}}AFX_DATA_INIT 9qy 9  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 7CMgvH)O  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); CgKSK0/a  
} j2qfEvU  
=<h=">}5'  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) iC+H;s5<  
{ *AQbXw]w  
 CDialog::DoDataExchange(pDX); P1>X5:  
 //{{AFX_DATA_MAP(CCaptureDlg) 8Xzx ;-&4  
  DDX_Control(pDX, IDC_KEY, m_Key); ;1k0o.3  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); }t-|^mY>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 3}1+"? s  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); >qvD3 9w  
  DDX_Text(pDX, IDC_PATH, m_Path); jeFl+K'1  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ]b| @<E7Y  
 //}}AFX_DATA_MAP <d`UifqD  
} 6i9I 4*'  
2^M+s\p  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) oP75|p  
//{{AFX_MSG_MAP(CCaptureDlg) jt r=8OiL  
 ON_WM_SYSCOMMAND() h1o+7  
 ON_WM_PAINT() h#ot)m|I  
 ON_WM_QUERYDRAGICON() [eP]8G\ W  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) #7T={mh  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) J5IJy3d  
 ON_BN_CLICKED(ID_CHANGE, OnChange) u.Yb#?  
//}}AFX_MSG_MAP X*"O'XCA  
END_MESSAGE_MAP() bd*(]S9d  
L/LN X{|  
BOOL CCaptureDlg::OnInitDialog() l>?vjy65  
{ DkKD~  
 CDialog::OnInitDialog();  /?xn  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9cj-v}5j  
 ASSERT(IDM_ABOUTBOX < 0xF000); \^LR5S&  
 CMenu* pSysMenu = GetSystemMenu(FALSE); {/!Gh\i  
 if (pSysMenu != NULL) vkgL"([_  
 { Q^w]Nj(e_  
  CString strAboutMenu; ?R:Hj=.  
  strAboutMenu.LoadString(IDS_ABOUTBOX); "Oko|3  
  if (!strAboutMenu.IsEmpty()) EC#10.  
  { *~^^A9C8  
   pSysMenu->AppendMenu(MF_SEPARATOR); =V 7w CW  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); KptLeb:Om  
  } .. TjEBp  
 } YDD]n*&  
 SetIcon(m_hIcon, TRUE); // Set big icon ADz|Y~V!  
 SetIcon(m_hIcon, FALSE); // Set small icon +[[gU;U"v  
 m_Key.SetCurSel(0); hzo,.hS's  
 RegisterHotkey(); :/l   
 CMenu* pMenu=GetSystemMenu(FALSE); 1&"1pH  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 0^Cx`xdX:  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); S c Kfr  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); @cGql=t  
 return TRUE; // return TRUE unless you set the focus to a control bM3e7olWS  
} AR3=G>hO,  
L"/ato  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) D9C; JD  
{ CnYX\^Ow  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) rWqA)j*!  
 { m/nn}+*C  
  CAboutDlg dlgAbout; $?{zV$r1  
  dlgAbout.DoModal(); CI'5JOqP  
 }  E/;YhFb[  
 else \c}r6xOr  
 { j=S"KVp9NF  
  CDialog::OnSysCommand(nID, lParam); wJkkc9Rh'(  
 } 2]ljm] \l  
} +]vl8, 4@  
iW~f  
void CCaptureDlg::OnPaint() vy?YA-  
{ e5KF~0`  
 if (IsIconic()) Sn&%epi  
 { Y|nTc.A  
  CPaintDC dc(this); // device context for painting eqCB2u"Jq  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); R"([Y#>m  
  // Center icon in client rectangle ?0Zw ^a  
  int cxIcon = GetSystemMetrics(SM_CXICON); _ 0E,@[  
  int cyIcon = GetSystemMetrics(SM_CYICON); Bx >@HU  
  CRect rect; Z Uv_u6aD  
  GetClientRect(&rect); 6^Vf 5W{  
  int x = (rect.Width() - cxIcon + 1) / 2; M-|2W~YU  
  int y = (rect.Height() - cyIcon + 1) / 2; V=~dgy ~@  
  // Draw the icon rzLl M  
  dc.DrawIcon(x, y, m_hIcon); miSC'!  
 } 8:NHPHxB  
 else Yg.u8{H  
 { }3lF;k(2g  
  CDialog::OnPaint(); 69yyVu_  
 } s. [${S6O  
} `,[c??h  
]:fHvx_?`7  
HCURSOR CCaptureDlg::OnQueryDragIcon() ApB0)N  
{ Cx~z^YP'  
 return (HCURSOR) m_hIcon; 74#@F{w  
} $@;[K \  
IRa*}MJe  
void CCaptureDlg::OnCancel() W0k q>s4  
{ 8<!9mgh  
 if(bTray) @oNrR$7  
  DeleteIcon(); ERjf.7)d  
  CDialog::OnCancel(); D(|$6J 0  
} 5Ncd1  
iI0'z=J  
void CCaptureDlg::OnAbout() \-yi#N  
{ HfPeR8I%i  
 CAboutDlg dlg; w2L)f,X  
 dlg.DoModal(); i,T{SV  
} N0PX<$y  
$49tV?q5  
void CCaptureDlg::OnBrowse() } _z~:{Y  
{ 6:pN?|=6X  
 CString str; LBB[aF,Lr  
 BROWSEINFO bi; bT}WJ2}  
 char name[MAX_PATH]; LlJvuQ 28  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); d+'+z %s%  
 bi.hwndOwner=GetSafeHwnd(); U"]i.J1  
 bi.pszDisplayName=name; ',pPs=  
 bi.lpszTitle="Select folder"; )j'b7)W\  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; &IYkeGQr  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); }I]q$3 .  
 if(idl==NULL) /([aD~.  
  return; x;Q2/YZ#  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); uItKsu  
 str.ReleaseBuffer(); w5Xdq_e3  
 m_Path=str; #Uu"olX7  
 if(str.GetAt(str.GetLength()-1)!='\\') @gOgs  
  m_Path+="\\"; VK#zmEiB  
 UpdateData(FALSE); qxx.f5 8H  
} }f}&|Vap  
FCPbp!q6  
void CCaptureDlg::SaveBmp() /2@@v|QL  
{ PdZSXP4;k  
 CDC dc; G'Y|MCKz>  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); y6oDbwke  
 CBitmap bm; X1"nq]chGy  
 int Width=GetSystemMetrics(SM_CXSCREEN); zqkmsFH{  
 int Height=GetSystemMetrics(SM_CYSCREEN); 1Rh&04O>VL  
 bm.CreateCompatibleBitmap(&dc,Width,Height); t JP(eaqZ  
 CDC tdc; y (A"g3^=  
 tdc.CreateCompatibleDC(&dc); bOdD:=f  
 CBitmap*pOld=tdc.SelectObject(&bm); \q>,c49a{  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); `U R.Rn/x  
 tdc.SelectObject(pOld); cg5DyQ(  
 BITMAP btm; ` g~-5Z~J  
 bm.GetBitmap(&btm); AXCJFqk;  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; hGeRM4zVZZ  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); eu =2a>  
 BITMAPINFOHEADER bih; K2QD&!4/T2  
 bih.biBitCount=btm.bmBitsPixel; By9/tB  
 bih.biClrImportant=0; p=zm_+=  
 bih.biClrUsed=0; m 78PQx H  
 bih.biCompression=0; n|.;g!QDA  
 bih.biHeight=btm.bmHeight; C0M{zGT>}  
 bih.biPlanes=1; ]{hfM  
 bih.biSize=sizeof(BITMAPINFOHEADER); ]nh)FMo  
 bih.biSizeImage=size; va0 a4s1O  
 bih.biWidth=btm.bmWidth; y~fy0P:T  
 bih.biXPelsPerMeter=0; M<nn+vy`  
 bih.biYPelsPerMeter=0; ~xCy(dL^}  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); fu/c)D6u*m  
 static int filecount=0; w#XJ!f6*_9  
 CString name; XV&3h>5  
 name.Format("pict%04d.bmp",filecount++); o>YR Kb  
 name=m_Path+name; 2-4%h!  
 BITMAPFILEHEADER bfh; oaHBz_pg  
 bfh.bfReserved1=bfh.bfReserved2=0; ~EBZlTN  
 bfh.bfType=((WORD)('M'<< 8)|'B'); kL-+V)Kl  
 bfh.bfSize=54+size; -Da_#_F  
 bfh.bfOffBits=54; Sv ,_G'  
 CFile bf; *sTQ9 Kr  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ]:;gk&P  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); R~i<*  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); <+a\'Xc  
  bf.WriteHuge(lpData,size); e/6oC~#]  
  bf.Close(); 3-05y!vbcE  
  nCount++; +vP1DXtj(  
 } X:A\{^ ~  
 GlobalFreePtr(lpData); >nxtQ  
 if(nCount==1) d={}a,3?  
  m_Number.Format("%d picture captured.",nCount); ~VOmMw4HV  
 else <  5ow81  
  m_Number.Format("%d pictures captured.",nCount); . XmD[=  
  UpdateData(FALSE); :X^B1z3X4  
} Buo1o&&  
L4!$bB~L-  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg)  7;XdTx  
{ _AFgx8  
 if(pMsg -> message == WM_KEYDOWN) 7Q`4*H6  
 { wcO+P7g  
  if(pMsg -> wParam == VK_ESCAPE) ,Y*f]  
   return TRUE; &^EkM  
  if(pMsg -> wParam == VK_RETURN) X7G6y|4;w  
   return TRUE; ,O2F}5|;  
 } ;23F8M%wH  
 return CDialog::PreTranslateMessage(pMsg); /mb| %U]~  
} *M="k 1P1  
g%Z;rDfi  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +m1edPA[  
{ O@[q./VV,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ z|9 ^T@)  
  SaveBmp(); T<OLfuV  
  return FALSE;  >4Lb+]  
} V{npK(  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ?$ 3=m)s  
 CMenu pop; NM4 n  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); dCHU* 7DS  
 CMenu*pMenu=pop.GetSubMenu(0); olqHa5qn  
 pMenu->SetDefaultItem(ID_EXITICON); (HTVSC%=  
 CPoint pt; c[5>kQ-nq  
 GetCursorPos(&pt); 0<Y)yNsV  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); +,smjg:O  
 if(id==ID_EXITICON) ' o 5,P/6  
  DeleteIcon(); n8?gZ` W  
 else if(id==ID_EXIT) |peZ`O^ ~  
  OnCancel(); 3Ry?{m^  
 return FALSE; yCz? V[49  
} aAX 8m  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); s:jwwE2  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) HJ2]xe09  
 AddIcon(); Z#F2<*+Pe  
 return res; FOZqN K  
} p\(%bO   
QKVZ![Y!s  
void CCaptureDlg::AddIcon() M4QMD;Ez  
{ C}Khh`8@5.  
 NOTIFYICONDATA data; &t4j px  
 data.cbSize=sizeof(NOTIFYICONDATA); mJT7e  
 CString tip; k,r\^1h  
 tip.LoadString(IDS_ICONTIP); MW p^.  
 data.hIcon=GetIcon(0); M?_VYK  
 data.hWnd=GetSafeHwnd(); 03MB,  
 strcpy(data.szTip,tip); ZXco5,1  
 data.uCallbackMessage=IDM_SHELL; k -SUp8}g  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Dr;@)  
 data.uID=98; fD!O aK  
 Shell_NotifyIcon(NIM_ADD,&data);  ~d }-  
 ShowWindow(SW_HIDE); L<E`~\C'  
 bTray=TRUE; bNqjjg  
} Abj`0\  
Bdq/Ohw|!  
void CCaptureDlg::DeleteIcon() 7_JK2  
{ )q#b^( v  
 NOTIFYICONDATA data; %1#5 7-  
 data.cbSize=sizeof(NOTIFYICONDATA); hX;xbl  
 data.hWnd=GetSafeHwnd(); KB-7]H  
 data.uID=98; VQX#P<  
 Shell_NotifyIcon(NIM_DELETE,&data); 6OVAsmE  
 ShowWindow(SW_SHOW); $ @^n3ZQ4  
 SetForegroundWindow(); %DiZ&}^Ck  
 ShowWindow(SW_SHOWNORMAL); %N!Y}$y  
 bTray=FALSE; iJq}tIk#2'  
} #fa~^]EM]  
vHao y  
void CCaptureDlg::OnChange() 50CU|  
{ N?~K9jGx(  
 RegisterHotkey(); ?4xTA  
} f~E'0f_  
M'*  Y  
BOOL CCaptureDlg::RegisterHotkey() & K7+V  
{ }lWEbQ)(!  
 UpdateData(); -PxA~((g5  
 UCHAR mask=0; 4).q+{#k  
 UCHAR key=0; sB /*gO  
 if(m_bControl) Fm*O&6W\@A  
  mask|=4; s7=]!7QGS!  
 if(m_bAlt) p#3P`I>ZrT  
  mask|=2; lGs fs(  
 if(m_bShift) 8TuOf(qE  
  mask|=1; 1MOQ/N2BR  
  key=Key_Table[m_Key.GetCurSel()]; rNZN}g  
 if(bRegistered){ N2C^'dFj  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); XO\P4x :c  
  bRegistered=FALSE; +HNQ2YZ  
 } ]F-{)j  
 cMask=mask; 7:;P>sF@  
 cKey=key; Pg5 1}{  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); OrHnz981K  
 return bRegistered; lB,.TK  
} M@ mCBcbN  
KO:o GUR  
  四、小结 h4ZrD:D0\  
BjJ+~R  
  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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