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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: Fuq MT`  
  ."`mh&+`  
  一、实现方法 >]b>gc?3  
sVXIR  
  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: 9*fA:*T  
q!UN<+k\h  
#pragma data_seg("shareddata") w:[1,rRvT  
HHOOK hHook =NULL; //钩子句柄 25EuVj`zL  
UINT nHookCount =0; //挂接的程序数目 r 0m A  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 m~7[fgN2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 yFt$L'#  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey )?_x$GKY  
static int KeyCount =0; J)R2O{z  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 _(A9k{  
#pragma data_seg() $z1W0  
GSlvT:k  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 [=3f:>ssm  
>~%!#,C(|U  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: *[XVkt`H  
,_SE!iL  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR #B_Em$  
cKey,UCHAR cMask) T2EQQFs  
{ {T;A50  
 BOOL bAdded=FALSE; 5&Y%N(  
 for(int index=0;index<MAX_KEY;index++){ 6f=,$:S$  
  if(hCallWnd[index]==0){ ~HW8mly'  
   hCallWnd[index]=hWnd; .kbo]P  
   HotKey[index]=cKey; Z\1*g k  
   HotKeyMask[index]=cMask; 6Bv!t2  
   bAdded=TRUE; %IAZU c  
   KeyCount++; ?HD eiJ kX  
   break; vI84= n  
  } MxXf.iX&  
 } A(Tqf.,G  
 return bAdded; ;i;2cq  
} FJI%+$]  
//删除热键 RC[mpR ;2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /Kw}R5l  
{ 4O I''i  
 BOOL bRemoved=FALSE; K[,d9j`^  
 for(int index=0;index<MAX_KEY;index++){ _1>Xk_  
  if(hCallWnd[index]==hWnd){ G 51l_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ XIep3l*  
    hCallWnd[index]=NULL; eT!*_.' e  
    HotKey[index]=0; -'!K("  
    HotKeyMask[index]=0; $m hIX A.  
    bRemoved=TRUE;  AqqD!  
    KeyCount--; *|Bu7nwg  
    break; to2#PXf]y  
   } W't?aj I|  
  } K^z u{`S  
 } DfPC@` k  
 return bRemoved; ?cyBF*o  
} Y5dt/8Jo  
1')_^]  
[ClDKswq  
  DLL中的钩子函数如下: 2`Dqu"TWh  
yuef84~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) E%.w6-  
{ o$4i{BL  
 BOOL bProcessed=FALSE; " Y1]6 Zu  
 if(HC_ACTION==nCode) cr wui8  
 { sY- ] Q  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 \Fh#CI  
   switch(wParam) bmid;X|  
   {  fen~k#|l  
    case VK_MENU: +VSq[P  
     MaskBits&=~ALTBIT; jV|j]m&t  
     break; {M_*hR;lL  
    case VK_CONTROL: s^&Oh*SP*  
     MaskBits&=~CTRLBIT; #7*{ $v  
     break; $.5f-vQp  
    case VK_SHIFT: L2 ybL#dz  
     MaskBits&=~SHIFTBIT; nO\c4#ce  
     break; 8\lRP,-  
    default: //judge the key and send message %&Fsk]T%:  
     break; z+5ZUS2~&  
   } R(^2+mV?  
   for(int index=0;index<MAX_KEY;index++){ 7A,lQh  
    if(hCallWnd[index]==NULL) `SfBT1#5G  
     continue; ;h"St0   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Hxr)`i46  
    { Z[Z3x6 6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); bb4 `s0  
     bProcessed=TRUE; 0[ BPmO6  
    } |T; ]%<O3E  
   } Au\j6mB  
  } =xs"<Q*w>  
  else if((lParam&0xc000ffff)==1){ //有键按下 swTur  
   switch(wParam) ,N1I\f  
   { %U uVD  
    case VK_MENU: $bCN;yE  
     MaskBits|=ALTBIT; f, iHM  
     break; ahUc ;S:v#  
    case VK_CONTROL: v'e5j``=  
     MaskBits|=CTRLBIT;  Lw1aG;5  
     break; wCitQ0?  
    case VK_SHIFT: {CaTu5\  
     MaskBits|=SHIFTBIT; ZzO^IZKlC  
     break; (DnrJ.QU}t  
    default: //judge the key and send message 2?}5U)Hg  
     break; \RF{ITV$kD  
   } LkwjEJQf  
   for(int index=0;index<MAX_KEY;index++){ sX c|++  
    if(hCallWnd[index]==NULL) ~u.( (GM  
     continue; +7V4mF!u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i]{-KZC  
    { vmGGdj5aI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 'V`Hp$r  
     bProcessed=TRUE; dR GgiQO  
    } v1`*}.#  
   } + t JEG:  
  } /@O$jlX5I  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 2FxrjA  
   for(int index=0;index<MAX_KEY;index++){ -}G>{5.A  
    if(hCallWnd[index]==NULL) n7p,{KSQ  
     continue; xgQ&'&7l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?l/+*/AR;  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /l b"g_  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ve9*>6i&-4  
   } \s@7pM=(  
  } cYx.<b JH  
 } @s % !R  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Q1 5h \!u  
} 3*C|"|lJ  
5faY{;8  
  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: Tya[6b!8  
XIRvIwO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^V?W'~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0K:3?Ik  
"/g\?Nce  
  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: DlF6tcoI  
5<77o|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) KM9)  
{ tPz!C&.=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 9NEL[J|  
 { nsjrzO79L8  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 2_C&p6VGj  
  SaveBmp(); n:P++^ j  
  return FALSE; Ap)pOD7  
 } v2KK%Qy  
 …… //其它处理及默认处理 XNaiMpp'  
} ><DXT nt'x  
=8W'4MC  
RA3!k&8?#  
  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。 @UwDsx&2(t  
p->b Vt  
  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。 +'ADN!(B_  
"eH.<&  
  二、编程步骤 P>wTp)  
(&@,ZI;  
  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"; =;m;r!,K  
d#cEAy  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 5`A^"}0  
m[$pj~<\  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; %<yH6h*u  
}HLV'^"k  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; j= vlsW  
(!:+q$#BK  
  5、 添加代码,编译运行程序。 eZv G  
zcCGR Ee=  
三、程序代码 oeA}b-Ct0  
+sm9H"_0  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL @q++eGm\Q  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) *U:0c ;h  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ !wr2OxK*  
#if _MSC_VER > 1000 \ ~uY);  
#pragma once \agT#tT J  
#endif // _MSC_VER > 1000 SadffAvSA{  
#ifndef __AFXWIN_H__ M|9=B<6`7  
#error include 'stdafx.h' before including this file for PCH cqZuG}VR  
#endif -;RW)n^n  
#include "resource.h" // main symbols }WM!e"  
class CHookApp : public CWinApp ?>T (  
{ 17) `CM$<[  
 public: <F&53N&Zc  
  CHookApp(); R.)w l  
  // Overrides met`f0jw  
  // ClassWizard generated virtual function overrides Y<)9TU:D!  
  //{{AFX_VIRTUAL(CHookApp) JL:\\JT.  
 public: ,k+F8{Q.  
  virtual BOOL InitInstance(); QQW]j;'~  
  virtual int ExitInstance(); oeF0t'%  
  //}}AFX_VIRTUAL ~`!{5:v  
  //{{AFX_MSG(CHookApp) }:xj%?ki  
  // NOTE - the ClassWizard will add and remove member functions here. ~7O.}RP0  
  // DO NOT EDIT what you see in these blocks of generated code ! g"|/^G_6S  
  //}}AFX_MSG N}X7g0>hV  
  DECLARE_MESSAGE_MAP() %WO4uOi:@  
}; pUm|e5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ]]!&>tOlI  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1Farix1YDq  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "H3DmsB  
BOOL InitHotkey(); hw)#TEt   
BOOL UnInit(); 'E_~>  
#endif WP ~]pduT  
_2wH4^Vb  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. vf/|b6'y  
#include "stdafx.h" Ek,$XH  
#include "hook.h" mY0FewwTy  
#include <windowsx.h> _eg&j  
#ifdef _DEBUG ;(0|2I'"  
#define new DEBUG_NEW *^s^{0Ad  
#undef THIS_FILE &A)u!l Ue  
static char THIS_FILE[] = __FILE__; )Bpvi4O  
#endif %?i~`0-:n%  
#define MAX_KEY 100 BU=;rz!;  
#define CTRLBIT 0x04 Z O\x|E!b  
#define ALTBIT 0x02 ~ "stI   
#define SHIFTBIT 0x01 ]Z=O+7(r  
#pragma data_seg("shareddata") Vohd d_x  
HHOOK hHook =NULL; g;._Q   
UINT nHookCount =0; C~q&  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey c]>LL(R-7)  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT #8sv*8&  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey /A"UV\H`f  
static int KeyCount =0; bd[%=5  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift uj^l&"  
#pragma data_seg()  mm9xO%  
HINSTANCE hins; L/7YI\C2  
void VerifyWindow(); fiZq C?(  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) y*7<tj.`b0  
//{{AFX_MSG_MAP(CHookApp) qJ%AbdOI8  
// NOTE - the ClassWizard will add and remove mapping macros here. ^7,`6g  
// DO NOT EDIT what you see in these blocks of generated code! {qbx iL-  
//}}AFX_MSG_MAP jQ&82X%m  
END_MESSAGE_MAP() Msl8o c  
Ers8J V  
CHookApp::CHookApp() G{4lgkyy  
{ D !5 {CQl  
 // TODO: add construction code here, C)qy=lx%  
 // Place all significant initialization in InitInstance HqoCl  
} dH_g:ocA  
3}gf %U]L  
CHookApp theApp; g#s hd~e  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) r"_SL!,^  
{ (^mpb  
 BOOL bProcessed=FALSE; _}3NLAqg  
 if(HC_ACTION==nCode) la{Iqm{i  
 { GPLq$^AH  
  if((lParam&0xc0000000)==0xc0000000){// Key up w3Z;&sFd  
   switch(wParam) P{%R*hb]  
   { U?&&yynK  
    case VK_MENU: U2HAIV8  
     MaskBits&=~ALTBIT; .u\xA7X  
     break; Q@5v> `  
    case VK_CONTROL: /& wA$h  
     MaskBits&=~CTRLBIT; /@feY?glc  
     break; L6n<h  
    case VK_SHIFT: 5rlZ'>I.  
     MaskBits&=~SHIFTBIT; p$_X\,F  
     break; t;L7H E@Y  
    default: //judge the key and send message EU4j'1!&g<  
     break; .g52p+Z#  
   } a`_w9r+v  
   for(int index=0;index<MAX_KEY;index++){ d8% sGH  
    if(hCallWnd[index]==NULL) qfa[KD)!aB  
     continue; o7 1f<&1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M TOZ:b  
    { H`EsFKw\%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); hYY-Eq4TC  
     bProcessed=TRUE; ,Uu#41ZOKL  
    } 6):iu=/i/  
   } q~G@S2=}0}  
  } 1rGi"kdf  
  else if((lParam&0xc000ffff)==1){ //Key down = @n`5g  
   switch(wParam) 1,Ji|&Pwf  
   { .j^=]3  
    case VK_MENU: cC7&]2X +f  
     MaskBits|=ALTBIT; w i=&W  
     break; I W5N^J  
    case VK_CONTROL: d6+{^v$#  
     MaskBits|=CTRLBIT; *28:|blbL  
     break; [E6ZmMB&  
    case VK_SHIFT: /Q\|u:oO,  
     MaskBits|=SHIFTBIT; #5=!ew  
     break; H:!pFj  
    default: //judge the key and send message 4$MV]ldUI  
     break; Q/^a(   
   } Wk-jaz  
   for(int index=0;index<MAX_KEY;index++) &.)ST0b4  
   { z%~rQa./$  
    if(hCallWnd[index]==NULL) \oy8)o/Gb  
     continue; l$J2|\M6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8rpr10;U  
    { TT3\c,cs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Hwiftx  
     bProcessed=TRUE; #!R=h|  
    } 3iBUIv  
   } 7]lUPLsl  
  } *!&,)''  
  if(!bProcessed){ 8Q\ T,C  
   for(int index=0;index<MAX_KEY;index++){ DE!P[$J  
    if(hCallWnd[index]==NULL) 4M*!'sG\  
     continue; +puF0]TR,i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `&5_~4T7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <-O^ol,fX  
   } -@?4Tfl  
  } .BrYz:#A  
 } 2 3*OuY  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); >o|.0aw<  
} 3R6=C~  
#bmbK{[  
BOOL InitHotkey() (Qj;B)  
{ k5o{mWI b  
 if(hHook!=NULL){ }^]TUe@a  
  nHookCount++; &9Xn:<"`)  
  return TRUE; t2RL|$>F1  
 } TpAso[r  
 else ~Zo;LSI  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); U]64HuL  
  if(hHook!=NULL) %WAaoR&u  
   nHookCount++; H rI(uZ]  
  return (hHook!=NULL); lCiRvh1K  
} 5"2pU{xmK  
BOOL UnInit() '-M9v3itC  
{ yLEA bd%+  
 if(nHookCount>1){ Pm== m9  
  nHookCount--; H.#zbKj  
  return TRUE; !A'3Mw\Nm  
 } ;kR+jC(  
 BOOL unhooked = UnhookWindowsHookEx(hHook); pz,iQUs _o  
 if(unhooked==TRUE){ y?ypRCgO.u  
  nHookCount=0; HA]5:ck  
  hHook=NULL; Gc2:^FVlh  
 } uow{a*q d6  
 return unhooked; Zx U?d   
} jWcfQ  
UthM?g^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) KU 98"b5  
{ (65|QA   
 BOOL bAdded=FALSE; JlhI3`X;/  
 for(int index=0;index<MAX_KEY;index++){ 3%YDsd vQx  
  if(hCallWnd[index]==0){ 6h{>U*N"&d  
   hCallWnd[index]=hWnd; gX;)A|9e  
   HotKey[index]=cKey; 8&c:73=?X  
   HotKeyMask[index]=cMask; UKzXz0  
   bAdded=TRUE; R7 ^f|/l  
   KeyCount++; qX:Y I3:,@  
   break; ]oizBa@?G  
  } yt1dYF0Xq  
 } Q+; N(\  
 return bAdded; oN&U@N/>aU  
} L)9uBdF  
 .F/0:)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9a0|iy  
{ UaXWHCm`  
 BOOL bRemoved=FALSE; ewVks>lbz  
 for(int index=0;index<MAX_KEY;index++){ kWbD?i-  
  if(hCallWnd[index]==hWnd){ .9@y*_ 9  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ g![?P"i^t  
    hCallWnd[index]=NULL; Hl=M{)q@   
    HotKey[index]=0; p61F@=EL  
    HotKeyMask[index]=0; ~ As_O6JI  
    bRemoved=TRUE; ,QPo%{:p  
    KeyCount--; ChRCsu~  
    break; O ~D]C  
   } Hk@LHC  
  } !]l;n Fd  
 } g4}K6)@  
 return bRemoved; Nc:0opPM  
} n |Q' >  
$\q}A:  
void VerifyWindow() )Ag{S[yZ  
{ U)C>^ !Us  
 for(int i=0;i<MAX_KEY;i++){ ie}?}s  
  if(hCallWnd!=NULL){ ]^I[SG,  
   if(!IsWindow(hCallWnd)){ H' %#71  
    hCallWnd=NULL; Lv7$@|"H9  
    HotKey=0; {)PgN  
    HotKeyMask=0; "HtaJVp//  
    KeyCount--; .wf$]oQQ  
   } =&#t ("  
  } 5q _n 69b  
 } tb;u%{S  
} ,d7o/8u  
#r'S@:[  
BOOL CHookApp::InitInstance() 2k+u_tj>  
{ j W/*-:  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); A@)ou0[n@  
 hins=AfxGetInstanceHandle(); [ ]42$5eof  
 InitHotkey(); UAOH9*9*  
 return CWinApp::InitInstance(); Mu/hTTiNx  
} oD=+  
J Mm'JK?  
int CHookApp::ExitInstance() Ah_0o_Di  
{ epG!V#I  
 VerifyWindow(); lN'b"N  
 UnInit(); HleMzykF  
 return CWinApp::ExitInstance(); Ti&v9re%wO  
} S3gd'Bahq  
_bSn YhS  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file nHl{'|~  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) |[X-i["y  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ X1o=rT  
#if _MSC_VER > 1000 *}=z^;_oq  
#pragma once >j)y7DSE  
#endif // _MSC_VER > 1000 Mi047-% (  
nTCwLnX(O  
class CCaptureDlg : public CDialog qL~|bfN  
{ . H9a  
 // Construction b}J,&eYD  
 public: 4%5 +  
  BOOL bTray; k;Ask#rs  
  BOOL bRegistered; rT';7>{g  
  BOOL RegisterHotkey(); Ir6g"kwCKq  
  UCHAR cKey; 8K2=WYN  
  UCHAR cMask; Le*gdoW.  
  void DeleteIcon(); &;[e  
  void AddIcon(); PGhYkj2  
  UINT nCount; lS/l iI'Y  
  void SaveBmp(); h I7ur  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor f{)nxd >#  
  // Dialog Data fr<V])  
  //{{AFX_DATA(CCaptureDlg) RL b o  
  enum { IDD = IDD_CAPTURE_DIALOG }; ^1;Eq>u  
  CComboBox m_Key; A$-\Er+f  
  BOOL m_bControl; 3c[]P2Bh  
  BOOL m_bAlt; r>g5_"FL  
  BOOL m_bShift; U U@  
  CString m_Path; Y?\PU{ O  
  CString m_Number; Un Ocw  
  //}}AFX_DATA *H~&hs>k  
  // ClassWizard generated virtual function overrides y\ax?(z  
  //{{AFX_VIRTUAL(CCaptureDlg) nx@,oC4  
 public: Y'76!Y  
  virtual BOOL PreTranslateMessage(MSG* pMsg); USzO):o  
 protected: oW3|b2D  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support d$:LUxM#  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); DVjwY_nG7  
  //}}AFX_VIRTUAL 1@xdzKua1  
  // Implementation v0KJKrliGO  
 protected: fT.MglJcb  
  HICON m_hIcon; ^CW{`eBwk  
  // Generated message map functions bp>M&1^KY  
  //{{AFX_MSG(CCaptureDlg) d0 ;<Cw~Tl  
  virtual BOOL OnInitDialog(); 75eZhs[b  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); F<J`1 :  
  afx_msg void OnPaint(); &{gy{npQ  
  afx_msg HCURSOR OnQueryDragIcon(); 6/.cS4  
  virtual void OnCancel(); r*{`_G=1  
  afx_msg void OnAbout(); T+41,  
  afx_msg void OnBrowse(); $Z<x r  
  afx_msg void OnChange(); Sh\Jm*5  
 //}}AFX_MSG >J/8lS{#  
 DECLARE_MESSAGE_MAP() mb*|$ysPx  
}; uMX\Y;N  
#endif F~?|d 0  
5=/j  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Fil6;R  
#include "stdafx.h" 6mV^a kapv  
#include "Capture.h" U&0 RQ:B  
#include "CaptureDlg.h" d[oHjWk  
#include <windowsx.h> pyp0SGCM:  
#pragma comment(lib,"hook.lib") q_Z6s5O  
#ifdef _DEBUG #,9#x]U#v  
#define new DEBUG_NEW qm< mw"]  
#undef THIS_FILE _ O;R  
static char THIS_FILE[] = __FILE__; W~/{ct$Y  
#endif rDv`E^\  
#define IDM_SHELL WM_USER+1 =b#:j:r  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8/R9YiY5*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `o?PLE;)p  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; s&1}^'|  
class CAboutDlg : public CDialog v\D.j4%ij  
{ N 5.kDT  
 public: BH0s ` K"  
  CAboutDlg(); : ZadPn56  
  // Dialog Data C4)m4r%  
  //{{AFX_DATA(CAboutDlg) ;*cCaB0u  
  enum { IDD = IDD_ABOUTBOX }; BT"n;L?[  
  //}}AFX_DATA CIj7' V  
  // ClassWizard generated virtual function overrides ]A:8x`z#F  
  //{{AFX_VIRTUAL(CAboutDlg) E_\V^  
 protected: w9675D+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support V/BU(`~i  
  //}}AFX_VIRTUAL pj Md  
  // Implementation f<M!L> +M6  
 protected: r9n:[A&HE  
  //{{AFX_MSG(CAboutDlg) -Eoq#ULvR  
  //}}AFX_MSG L| ;WE=  
  DECLARE_MESSAGE_MAP() otlv ;3263  
}; R#ZO<g%'  
gv,1 CK  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) X'j9l4Ph7  
{ i5SDy(?r  
 //{{AFX_DATA_INIT(CAboutDlg) _pxurq{  
 //}}AFX_DATA_INIT myF/_o&Ty  
} p# |} o9  
Sl'{rol'  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) (U@$gkUx}G  
{ 4+MaV<!tU^  
 CDialog::DoDataExchange(pDX); M2I*_pI  
 //{{AFX_DATA_MAP(CAboutDlg) 3 Scc"9]  
 //}}AFX_DATA_MAP Qh+zs^-?  
} i5gNk)D  
d6)+d9?<  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) WZ=$c]gG  
 //{{AFX_MSG_MAP(CAboutDlg) ._q<~_~R  
 // No message handlers mDO! o  
 //}}AFX_MSG_MAP 'xGTaKlm,  
END_MESSAGE_MAP() "O~kIT?/v  
-t: U4r(  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) biENRJQ.  
: CDialog(CCaptureDlg::IDD, pParent) =yWdtBng  
{ +G)a+r'0Q  
 //{{AFX_DATA_INIT(CCaptureDlg) ^Hz1z_[X@  
  m_bControl = FALSE; lN x7$z`  
  m_bAlt = FALSE; vsJDVJ +=  
  m_bShift = FALSE; <`WcI`IA b  
  m_Path = _T("c:\\"); d>V#?1$h  
  m_Number = _T("0 picture captured."); F?t;bV  
  nCount=0;  3Hi8=*  
  bRegistered=FALSE; 6FY.kN\  
  bTray=FALSE; lIPz "  
 //}}AFX_DATA_INIT EI496bsRHm  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 jZ''0Lclpc  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /0Mt-8[  
} yW&ka3j\  
[Y.=bfV!  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) e'->Sg  
{ GP;N1/=  
 CDialog::DoDataExchange(pDX); FH%M5RD  
 //{{AFX_DATA_MAP(CCaptureDlg) z\$(@:{A  
  DDX_Control(pDX, IDC_KEY, m_Key); )y{:Uc\4!  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); tG~[E,/`  
  DDX_Check(pDX, IDC_ALT, m_bAlt); jB`:(5%RO  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); +!ZfJZls  
  DDX_Text(pDX, IDC_PATH, m_Path); / }*}r  
  DDX_Text(pDX, IDC_NUMBER, m_Number); u:^sEk"Lk'  
 //}}AFX_DATA_MAP <GF^VT|Ce  
} !t}yoN n|  
Z\cD98B#  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ]r'D  
//{{AFX_MSG_MAP(CCaptureDlg) M3r;Pdj2r  
 ON_WM_SYSCOMMAND() VOIni<9y  
 ON_WM_PAINT() eD7qc1*G  
 ON_WM_QUERYDRAGICON() mtdy@=?1Y  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ?!O4ia3nFk  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) @8$z2  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ~/XDA:nfL:  
//}}AFX_MSG_MAP XlnSh<e  
END_MESSAGE_MAP() P#D|CP/Cu  
v7\rW{~Jd&  
BOOL CCaptureDlg::OnInitDialog() vmh>|N4a7  
{ $ Ggnn#  
 CDialog::OnInitDialog(); 3W{ !\  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9E NI%Jz  
 ASSERT(IDM_ABOUTBOX < 0xF000); .R l7,1\  
 CMenu* pSysMenu = GetSystemMenu(FALSE); R:j mn  
 if (pSysMenu != NULL) )sNPWn8<Uy  
 { =3!o _  
  CString strAboutMenu; p$uPj*  
  strAboutMenu.LoadString(IDS_ABOUTBOX); |(AFU3 ~  
  if (!strAboutMenu.IsEmpty()) O<E8,MCA[a  
  { %k~ezn  
   pSysMenu->AppendMenu(MF_SEPARATOR); Dt{WRe\#  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); (L yKo  
  } (4Nj3x o  
 } {e q378d  
 SetIcon(m_hIcon, TRUE); // Set big icon |* ^LsuFb  
 SetIcon(m_hIcon, FALSE); // Set small icon .rS. >d^n  
 m_Key.SetCurSel(0); dMCoN8W  
 RegisterHotkey(); bwj{5-FU  
 CMenu* pMenu=GetSystemMenu(FALSE); (.X)=  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 1 b 86@f   
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); aOS,%J^ ?  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); uB#U( jl  
 return TRUE; // return TRUE unless you set the focus to a control klH?!r&  
} K?r  
k/sfak{Q  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) LNyrIk/1  
{ +k~0&lZi  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) %M))Ak4 ~a  
 { (w:,iw#  
  CAboutDlg dlgAbout; ;FW <%  
  dlgAbout.DoModal(); (\!?>T[En  
 } fx>U2  
 else )WInPW  
 { o8|qT)O@U  
  CDialog::OnSysCommand(nID, lParam); v$w}UC%uf  
 } p|8ZHR+  
} {f@Q&(g  
\KzJNCOT  
void CCaptureDlg::OnPaint() +I3O/=)  
{ ;Rpib[m  
 if (IsIconic()) 3W]gn8  
 { f*xr0l  
  CPaintDC dc(this); // device context for painting :0QDV~bs  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 79D~Mau#  
  // Center icon in client rectangle 841y"@*BY  
  int cxIcon = GetSystemMetrics(SM_CXICON); ZO/u3&gU  
  int cyIcon = GetSystemMetrics(SM_CYICON); e([>sAx!1  
  CRect rect; 9 M%Gnz  
  GetClientRect(&rect); x^1d9Z  
  int x = (rect.Width() - cxIcon + 1) / 2; g6;smtu_T  
  int y = (rect.Height() - cyIcon + 1) / 2; &pjj  
  // Draw the icon N-_APWA  
  dc.DrawIcon(x, y, m_hIcon); 0zkMRBe  
 } {u2Zl7]z^  
 else )Jdku}Pf  
 { \$*CXjh3G  
  CDialog::OnPaint(); w;j<$<4=7  
 } >TY;l3ew  
} _U-`/r o  
9} m?E<6&  
HCURSOR CCaptureDlg::OnQueryDragIcon() @!u{>!~0  
{ +L`}(yLJ)9  
 return (HCURSOR) m_hIcon; I:G8B5{J  
} sZT~ 5c8  
^D6TeH  
void CCaptureDlg::OnCancel() J-<_e??  
{ /I!62?)-*  
 if(bTray) 6 /5,n0  
  DeleteIcon();  BgQ/$,  
  CDialog::OnCancel(); J?yasjjgP  
} BxjSo^n  
RL/y7M1j  
void CCaptureDlg::OnAbout() [P =P8-5  
{ AvB=/p@]  
 CAboutDlg dlg; IZ7o6Etti  
 dlg.DoModal(); Nw$OJ9$L>  
} IGQBTdPUa  
At?|[%< `  
void CCaptureDlg::OnBrowse() Q?1J<(oq9  
{ {59 >U~  
 CString str; 4=/jh:h  
 BROWSEINFO bi; !%ju.Xs8  
 char name[MAX_PATH]; E;{RNf|  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); m*A b<$y  
 bi.hwndOwner=GetSafeHwnd(); HY FMf3  
 bi.pszDisplayName=name; f? @Qt<+k  
 bi.lpszTitle="Select folder"; \)rMC]  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; jwa6`u  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); s_XCKhN:  
 if(idl==NULL) `Wg"m~l$N  
  return; B=L!WGl<!  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ( _6j@?u  
 str.ReleaseBuffer(); GDSXBa*7  
 m_Path=str; ] xHiy+  
 if(str.GetAt(str.GetLength()-1)!='\\') H-+U^@w  
  m_Path+="\\"; fmj}NV&ma  
 UpdateData(FALSE); 4 ZnQpKg  
} WA~[) S0  
$wp>2  
void CCaptureDlg::SaveBmp() )9_W"'V  
{ [,,@>nyD  
 CDC dc; vj%"x/TP  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); #e-K It  
 CBitmap bm; rzIWQFv  
 int Width=GetSystemMetrics(SM_CXSCREEN); -d A9x~o  
 int Height=GetSystemMetrics(SM_CYSCREEN); ">CRFee0  
 bm.CreateCompatibleBitmap(&dc,Width,Height); eyJWFJh  
 CDC tdc; W&)f#/M8  
 tdc.CreateCompatibleDC(&dc); ;mQ|+|F6X  
 CBitmap*pOld=tdc.SelectObject(&bm); 5\C(2naf  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY);   8sG?|u  
 tdc.SelectObject(pOld); [0y,K{8t  
 BITMAP btm; |ymW0gh7o$  
 bm.GetBitmap(&btm); r9WR1&T)  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; '`2'<^yO  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); :_6o|9J\t  
 BITMAPINFOHEADER bih; ,"is%O.  
 bih.biBitCount=btm.bmBitsPixel; kC%H E  
 bih.biClrImportant=0; wGNE b  
 bih.biClrUsed=0; :rQDA =Ps  
 bih.biCompression=0; eN.6l2-  
 bih.biHeight=btm.bmHeight; oSD=3DQ;  
 bih.biPlanes=1; M$%ON>K q  
 bih.biSize=sizeof(BITMAPINFOHEADER); %xCL&}bY  
 bih.biSizeImage=size; #$xtUCqX  
 bih.biWidth=btm.bmWidth; @9| jY1  
 bih.biXPelsPerMeter=0; npltsK):  
 bih.biYPelsPerMeter=0; A{ T9-f@X  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); YiO}"  
 static int filecount=0; <Y7j'n  
 CString name; /~u^@@.  
 name.Format("pict%04d.bmp",filecount++); +bLP+]7oZ  
 name=m_Path+name; =o~+R\1ux+  
 BITMAPFILEHEADER bfh; 6Q7=6  
 bfh.bfReserved1=bfh.bfReserved2=0; nt$P A(Y  
 bfh.bfType=((WORD)('M'<< 8)|'B'); En9J7es_  
 bfh.bfSize=54+size; ,$:u^;V(  
 bfh.bfOffBits=54; k- 9i  
 CFile bf; :XFQ}Cl  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ \ YF@r7  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); dY&v(~&;]  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #~nXAs]Q  
  bf.WriteHuge(lpData,size); jyW={%&  
  bf.Close(); " $farDDoF  
  nCount++; hGY-d}npAJ  
 } /)J]ItJlz  
 GlobalFreePtr(lpData); >8I~i:hn  
 if(nCount==1) 3]?='Qq.(  
  m_Number.Format("%d picture captured.",nCount); Ebs]]a>PO  
 else "zJxWXI  
  m_Number.Format("%d pictures captured.",nCount); k1xx>=md|C  
  UpdateData(FALSE); 1a(\F 7  
} j% 7Gje[  
lqOpADLS3  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) E/oLE^yL  
{ ME]4tu  
 if(pMsg -> message == WM_KEYDOWN) onSt%5{P%X  
 { eUQmW^  
  if(pMsg -> wParam == VK_ESCAPE) , 4xNW:!j  
   return TRUE; ,Ohhl`q(  
  if(pMsg -> wParam == VK_RETURN) `)y ;7%-  
   return TRUE; V[kJ;YLPN  
 } @NA+Ma{N  
 return CDialog::PreTranslateMessage(pMsg); ^UKY1Q .  
} C;HEv q7  
6 :3Id  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) e8 ]CB  
{ F]6G<6T[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ I2CI9,0  
  SaveBmp(); jy.L/s  
  return FALSE; C('D]u$Hdk  
} &%j`WF4p  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ _0rt.NRD  
 CMenu pop; HN NeH;L  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ? bWc<]  
 CMenu*pMenu=pop.GetSubMenu(0); k8}fKVU;  
 pMenu->SetDefaultItem(ID_EXITICON); ASoBa&vX  
 CPoint pt; p1niS:}j  
 GetCursorPos(&pt); W?zj^y[w  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); j:1N&7<FU  
 if(id==ID_EXITICON) 02;'"EmP$  
  DeleteIcon(); YX,;z/Jw2  
 else if(id==ID_EXIT) >l)x~Bkf$j  
  OnCancel(); 33lh~+C  
 return FALSE; u->[ y1JY  
} V=+|]`  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); qbq2Bi'a  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) w,j!%N  
 AddIcon(); Zj]tiN f\"  
 return res; }rmr0Bh  
} Dz~^AuD6  
k8st XW-w  
void CCaptureDlg::AddIcon() hk5!$#^  
{ K\Q4u4DjbJ  
 NOTIFYICONDATA data; %1k"K~eu  
 data.cbSize=sizeof(NOTIFYICONDATA); | ;a$ l(~<  
 CString tip; t'$_3ml  
 tip.LoadString(IDS_ICONTIP); 4uO88[=  
 data.hIcon=GetIcon(0); n%36a(] t  
 data.hWnd=GetSafeHwnd(); 3n7>qZ.d  
 strcpy(data.szTip,tip); C<a&]dN/  
 data.uCallbackMessage=IDM_SHELL; U`~L}w"  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ,/p+#|>C=  
 data.uID=98; h#UPU7;  
 Shell_NotifyIcon(NIM_ADD,&data); apJXRH`  
 ShowWindow(SW_HIDE); ck `td%  
 bTray=TRUE; j07A>G-=  
} ckFPx l.  
[g"nu0sOK  
void CCaptureDlg::DeleteIcon() aj1g9 y  
{ F7C+uG Ts  
 NOTIFYICONDATA data; <^> nR3E  
 data.cbSize=sizeof(NOTIFYICONDATA); Y]6d Yq{k  
 data.hWnd=GetSafeHwnd(); `*Wg&u  
 data.uID=98; e`LvHU_0  
 Shell_NotifyIcon(NIM_DELETE,&data); A?n5;mvq#  
 ShowWindow(SW_SHOW); M*T!nwb  
 SetForegroundWindow(); au=@]n#<(  
 ShowWindow(SW_SHOWNORMAL); |AExaO"jk  
 bTray=FALSE; tIV9Y=ckr0  
} X^&--@l}T!  
R>Ox(MG  
void CCaptureDlg::OnChange() HI:1Voy  
{ //r)dN^  
 RegisterHotkey(); s."N7F  
} b~<V}tJ  
X<Xiva85  
BOOL CCaptureDlg::RegisterHotkey() WaX!y$/z  
{ Dby|l#X  
 UpdateData(); dlZ2iDQ%  
 UCHAR mask=0; dhP")@3K;p  
 UCHAR key=0; '?I3&lYz{  
 if(m_bControl) aEa.g.SZ  
  mask|=4; s4f{ziLp  
 if(m_bAlt) PpLh j  
  mask|=2; hd/'>]  
 if(m_bShift) \O~/^ Y3U!  
  mask|=1; #d<"Ub  
  key=Key_Table[m_Key.GetCurSel()]; 1\lZ&KX$i  
 if(bRegistered){ <ir]bQT  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); By[M|4a  
  bRegistered=FALSE; %'. x vC  
 } eFy {VpO+  
 cMask=mask; >*B59+1P  
 cKey=key; q3v5gz^t  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ntPX?/  
 return bRegistered; N2j^fZd_  
} WCqa[=v)t  
yoieWnL}  
  四、小结 <7Yh<(R e^  
keQRS+9  
  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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