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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: v"J|Ebx  
  5:EE%(g9  
  一、实现方法 xFp9H'j{  
{w99~?  
  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: ,? &$ c+  
1ahb:Mjv  
#pragma data_seg("shareddata") XFww|SG$  
HHOOK hHook =NULL; //钩子句柄 $uK[[k~=S  
UINT nHookCount =0; //挂接的程序数目 PbMvM  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 W%9"E??c  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 5(Xq58nhxI  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey g J$m'kC;  
static int KeyCount =0; 5y~B/.YY  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 1py >[II@  
#pragma data_seg() %.{xo.`a[  
zKG]7  
  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。 gvP.\,U  
PC!X<C8*  
  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: U/rFH9e$  
,/Y$%.Rp  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR _9iF`Q  
cKey,UCHAR cMask) ]U 1S?p  
{ +gb"} cN  
 BOOL bAdded=FALSE; sNC~S%[  
 for(int index=0;index<MAX_KEY;index++){ VOp+6ho<  
  if(hCallWnd[index]==0){ ve(@=MJ  
   hCallWnd[index]=hWnd; -PiZvge  
   HotKey[index]=cKey; ZQ#AEVI,  
   HotKeyMask[index]=cMask; .8CfCRq  
   bAdded=TRUE; q&wv{  
   KeyCount++; -$D#u  
   break; l W Lj==  
  } (*!4O>]  
 } qKuHd~M{ 1  
 return bAdded; $I\lJ8  
} ;AarpUw'  
//删除热键 @=l.J+lh  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \3j4=K'nE  
{ t;[?Q\  
 BOOL bRemoved=FALSE;  0LUw  
 for(int index=0;index<MAX_KEY;index++){ -kzg(+sm  
  if(hCallWnd[index]==hWnd){ ]=]`Mnuxb  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `S=4cSH(  
    hCallWnd[index]=NULL; S'AS,'EnY  
    HotKey[index]=0; G0x!:[  
    HotKeyMask[index]=0; '[[*(4 a3  
    bRemoved=TRUE; [8`^_i=#  
    KeyCount--; V%J_iY/BUb  
    break; #w)D ml  
   } xEe3,tb'e  
  } 2fdC @V  
 } 0a v2w5>af  
 return bRemoved; yrrP#F  
} Y2y = P  
BUEV+SZ4  
I%ZSh]On  
  DLL中的钩子函数如下: M0RVEhX  
B+=Xb;p8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) K%>3ev=y.s  
{ 1f5;^T I  
 BOOL bProcessed=FALSE; th|TwD&mO  
 if(HC_ACTION==nCode) 4= hz4(5a  
 { YR68'Sft[  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 s#)tiCSVW  
   switch(wParam) 6C*4' P9>  
   {  jR,3 -JQ  
    case VK_MENU: Jb` yK@x  
     MaskBits&=~ALTBIT; `[.4SIah  
     break; #TY[\$BHs  
    case VK_CONTROL: 5%XEybc2  
     MaskBits&=~CTRLBIT; %@[ ~s,6<  
     break; CLY>M`%?+p  
    case VK_SHIFT: ]=0$-ImQ@x  
     MaskBits&=~SHIFTBIT; fmk(}  
     break; -gLU>I7wV  
    default: //judge the key and send message * n>YS  
     break; |K$EULzz  
   } ]Y6y ]u  
   for(int index=0;index<MAX_KEY;index++){ 'xc=N  
    if(hCallWnd[index]==NULL) 17;qJ_T)  
     continue; 4ew#@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v@]\  P<E  
    { QU^?a~r  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); J k FZd  
     bProcessed=TRUE; U^xtS g  
    } ^Jn=a9Q6Z  
   } 'fY( Vm  
  } V%!my[b  
  else if((lParam&0xc000ffff)==1){ //有键按下 WEugm603  
   switch(wParam) &GLe4zEh  
   { "Bbd[ZI8  
    case VK_MENU: {}v<2bS  
     MaskBits|=ALTBIT; }VXZM7@u  
     break; /7XVr"R  
    case VK_CONTROL: u1i ?L'  
     MaskBits|=CTRLBIT; G_n~1?  
     break; }h`ddo  
    case VK_SHIFT: $iAd)2LT  
     MaskBits|=SHIFTBIT; _^u^@.Q'i<  
     break; I r;Z+}4>Y  
    default: //judge the key and send message _8nT$!\\  
     break; +h? z7ZY^  
   } _f~m&="T!  
   for(int index=0;index<MAX_KEY;index++){ T6p2=o&p  
    if(hCallWnd[index]==NULL) sBm/9vu  
     continue; #_[W*-|L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !3Me 6&$O  
    { 8qQrJFm|3*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +%RB&:K7,  
     bProcessed=TRUE; @)p?!3{"  
    } O_ /|Wx  
   } ~l>2NY  
  } gpzZs<ST  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 SI@Yct]<g  
   for(int index=0;index<MAX_KEY;index++){ 9q f=P3  
    if(hCallWnd[index]==NULL) - -H%FYF`  
     continue; :~+m9r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) qz/d6-0"  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); K yFR;.F-  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 B< BS>(Nr>  
   } "?TKz:9r  
  } Wc- 8j2M  
 } XP!7@:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Pi:=0,"XOp  
} xSoXf0zq:  
`tZ`a  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: /QCyA%y  
H@hHEzO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Qp]-4%^Vz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1brKs-z  
b!xm=U  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ^5d9n<_xnQ  
1*J#:|({(  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) &C7HG^;W9  
{ sz+Uq]Mn  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) VyL|d^'f_  
 { J?N9*ap)  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 )!(etB=`y  
  SaveBmp(); JqmKD4p  
  return FALSE; /Jci1o  
 } 9 ]W4o"  
 …… //其它处理及默认处理 bB|P`l L  
} "sU  ~|  
[ O"8Tzr  
qo" _w%{  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 z("Fy  
0al8%z9e@  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 GcYT<pwN6  
``4lomz>  
  二、编程步骤 xg2 &  
M,b^W:('4  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; CuD^@  
GBsM?A:  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; tug\X  
*X4$'LSx1  
  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; |]9Z#lv+I  
YKsc[~ h  
  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; &,B91H*#  
>ey- j\_v  
  5、 添加代码,编译运行程序。 hu+% X.F4  
lm;G8IP`  
三、程序代码 15^5y RXC  
CAD:ifV  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 19t'  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) {b6g!sE  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ vz_ZXy9Z  
#if _MSC_VER > 1000 /4Lmu+G4  
#pragma once ?nAKB5=  
#endif // _MSC_VER > 1000 #Qp.O@e  
#ifndef __AFXWIN_H__ P7iU_CgyW  
#error include 'stdafx.h' before including this file for PCH gwepaW  
#endif @0>3))  
#include "resource.h" // main symbols I^z$0  
class CHookApp : public CWinApp "gPAxt  
{ `i)&nW)R  
 public: [d_sd  
  CHookApp(); _("&jfn  
  // Overrides cOr@dUSL  
  // ClassWizard generated virtual function overrides SAEV "  
  //{{AFX_VIRTUAL(CHookApp) 32sb$|eQq  
 public: KVrK:W--p  
  virtual BOOL InitInstance(); mTW@E#)n  
  virtual int ExitInstance(); `1[GY){?)  
  //}}AFX_VIRTUAL bu2'JIDR  
  //{{AFX_MSG(CHookApp) t[ZumQ@HC  
  // NOTE - the ClassWizard will add and remove member functions here. !F|iL  
  // DO NOT EDIT what you see in these blocks of generated code ! k5@_8Rc  
  //}}AFX_MSG dIR6dI   
  DECLARE_MESSAGE_MAP() =abth6#)  
}; )*Qa 9+ :  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); rGe^$!QB  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^{W#ut>IN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :tA|g  
BOOL InitHotkey(); Um$a9S8b&  
BOOL UnInit(); ymsqJ   
#endif Mwdw7MZ"S  
69v[* InSd  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ] cv|A^  
#include "stdafx.h" 0+\~^  
#include "hook.h" ew n/@;E  
#include <windowsx.h> |UO1vA@  
#ifdef _DEBUG 2.K"+%  
#define new DEBUG_NEW {mp;^/O`er  
#undef THIS_FILE \JLiA>@@  
static char THIS_FILE[] = __FILE__; JqdNO:8  
#endif n>dM OQb  
#define MAX_KEY 100 "p\XaClpz  
#define CTRLBIT 0x04 N3};M~\  
#define ALTBIT 0x02 Mlpq2I_x  
#define SHIFTBIT 0x01 2rw<]Ce  
#pragma data_seg("shareddata") "F+Wo&  
HHOOK hHook =NULL; qKL_1 ~  
UINT nHookCount =0; N!fp;jvG  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ?ExfxR!~  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT \\D~Yg\#  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey A*h)p@3t<  
static int KeyCount =0; [^gSWU  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift bz~-uHC  
#pragma data_seg() _l?5GLl_F$  
HINSTANCE hins; f-\l<o(  
void VerifyWindow(); Z v=p0xH  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ]'aG oR  
//{{AFX_MSG_MAP(CHookApp) -BV&u(  
// NOTE - the ClassWizard will add and remove mapping macros here. g(:y_EpmLH  
// DO NOT EDIT what you see in these blocks of generated code! B%Yb+M&K  
//}}AFX_MSG_MAP a<V=C  
END_MESSAGE_MAP() S)"5X)mq  
|7zm!^t$  
CHookApp::CHookApp() ]sjOn?YA+  
{ 2="C6 7TK  
 // TODO: add construction code here, 'FBvAk6  
 // Place all significant initialization in InitInstance J<_&f_K0]  
} LwUvM  
(D8'qx-M  
CHookApp theApp; &-+&`h|s  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |k'I?:'  
{ jkNZv. )p  
 BOOL bProcessed=FALSE; Ze$:-7Czl  
 if(HC_ACTION==nCode) 7l Aa6"Y68  
 { P|.KMtG  
  if((lParam&0xc0000000)==0xc0000000){// Key up 2597#O  
   switch(wParam) >t8eVMMa  
   { r/Pg,si  
    case VK_MENU: +V |]:{3W  
     MaskBits&=~ALTBIT; /$rS0@p  
     break; nWZrB s _  
    case VK_CONTROL: YKh%`Y1<  
     MaskBits&=~CTRLBIT; O)5-6lm  
     break; !00%z  
    case VK_SHIFT: ,XP9NHE  
     MaskBits&=~SHIFTBIT; i=2+1 ;K  
     break; #U/B,`= >  
    default: //judge the key and send message [uRsB5  
     break; g{$&j*Q9  
   } q@(N 38D  
   for(int index=0;index<MAX_KEY;index++){ W,agP G\+  
    if(hCallWnd[index]==NULL) j7-#">YL  
     continue; ]-.Q9cjc$q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) % wRJ"T`Tt  
    { @V:b Co  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); of& vQ  
     bProcessed=TRUE; nTu"  
    } oS_p/$F,  
   } <R{\pz2w  
  } /gFyow1W  
  else if((lParam&0xc000ffff)==1){ //Key down !s)2H/KM8  
   switch(wParam) "E2 g7n&  
   { NHc+QMbou(  
    case VK_MENU: N=+Up\h  
     MaskBits|=ALTBIT; 1*-58N*  
     break; n6o}$]H  
    case VK_CONTROL: 71/6=aq>n  
     MaskBits|=CTRLBIT; OClY ,@  
     break; Eun%uah6c  
    case VK_SHIFT: r9vC&pWZ  
     MaskBits|=SHIFTBIT; |J}~a8o  
     break; 3\@6i'  
    default: //judge the key and send message [1vrv(u>  
     break; Pq4sv`q)S  
   } SyYa_=En  
   for(int index=0;index<MAX_KEY;index++) _ve7Is`/  
   { \W@?revK  
    if(hCallWnd[index]==NULL) sox 90o 7  
     continue; \O/=g6w|t}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9)YG)A~<  
    { hG;u8|uT^i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 5d4-95['_  
     bProcessed=TRUE; AARhGx|L<  
    } wOk:Q4OjL  
   } $9J"r9@@  
  } Y0hL_46>  
  if(!bProcessed){ H{GbOI.  
   for(int index=0;index<MAX_KEY;index++){ rz.`$b  
    if(hCallWnd[index]==NULL) N]=.I   
     continue; uPp(l4(+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 0^[$0]Mt[  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); fg1 zT~  
   } =q"3a9 pb7  
  } yz+r @I5  
 } uC;@Yi8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ss2:8up 99  
} /n_HUY  
Y.C*|p#  
BOOL InitHotkey() QnGJ4F  
{ }M~AkJL  
 if(hHook!=NULL){ p' gv5\u[w  
  nHookCount++; <n`|zQ  
  return TRUE; g{a0,B/j  
 } ^Ta"Uk'  
 else #e0+;kBh  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); jf2E{48P  
  if(hHook!=NULL) 3~S~)quwP  
   nHookCount++; O0I/^  
  return (hHook!=NULL); "{:*fI;!  
} _6[NYv$"  
BOOL UnInit() L`p[Dq.  
{ }z*p2)v`  
 if(nHookCount>1){ R`<E3J\*  
  nHookCount--; @F1pu3E  
  return TRUE; bBQp:P?E  
 } bIhL!Ty T.  
 BOOL unhooked = UnhookWindowsHookEx(hHook);  +*!!  
 if(unhooked==TRUE){ FPMW"~v  
  nHookCount=0; f Gfv{4R  
  hHook=NULL; ~>EVI=?  
 } Av[jFk  
 return unhooked; C^~iz in  
} ':[y]ep(~|  
](ninSX1w  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) X3>(K1  
{ bC{~/ JP  
 BOOL bAdded=FALSE; ?:2Xh/8-  
 for(int index=0;index<MAX_KEY;index++){ cP Y^Bf5)  
  if(hCallWnd[index]==0){ v ;A  
   hCallWnd[index]=hWnd; f ;Dz(~ hw  
   HotKey[index]=cKey; ["7}u^z@<+  
   HotKeyMask[index]=cMask; n#R!`*[  
   bAdded=TRUE; Ea !j-Lbo  
   KeyCount++; St3~Y{aI|  
   break; ,8 .`;  
  } dvf*w:5K!  
 } Z~R i%XG  
 return bAdded; O//e0?]W  
} #-`lLI:w0  
WZr~Pb9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "&ks8 3  
{ g=%&p?1@E  
 BOOL bRemoved=FALSE; yqU++;6  
 for(int index=0;index<MAX_KEY;index++){ ^Ve^}|qPc  
  if(hCallWnd[index]==hWnd){ ~Mx fud  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ p)ONw"sb  
    hCallWnd[index]=NULL; nZ*P:K t:  
    HotKey[index]=0; K$Ph$P@   
    HotKeyMask[index]=0; GB=q}@&8p  
    bRemoved=TRUE; o?3R HP47  
    KeyCount--; cQR1v-Xt  
    break; +EB# #  
   } bODl q  
  } 7PMZt$n  
 } y{N9.H2  
 return bRemoved; p%s D>1k  
} JjmL6(*ui  
ymzm x$o=  
void VerifyWindow() YJy*OS_&  
{ HT&0i,`  
 for(int i=0;i<MAX_KEY;i++){ zxh"@j$?  
  if(hCallWnd!=NULL){ = `^jz}  
   if(!IsWindow(hCallWnd)){ gr;M  
    hCallWnd=NULL; NR*SEbUU*  
    HotKey=0; >g[W@FhT'k  
    HotKeyMask=0; QJ>>&`{ ,  
    KeyCount--; a:fHTU=\p  
   } 2 zy^(%a  
  } s :ruCS  
 } J-}NFWR;t  
} r)t^qhn  
)~/U+,  
BOOL CHookApp::InitInstance() b>i=",i\  
{ nqBu C  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); /\#5\dHj  
 hins=AfxGetInstanceHandle(); c;^J!e  
 InitHotkey(); B4}XK =)  
 return CWinApp::InitInstance(); ]Q3Gj@6  
} 0 OBkd  
=Wf@'~K0k"  
int CHookApp::ExitInstance() .H"hRYPC?  
{ F MVmH!E  
 VerifyWindow(); V|AE~R^  
 UnInit(); T?Y\~.+99  
 return CWinApp::ExitInstance(); Pio^5jhB6  
} <IVz mzpL  
6"7qZq  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file K>[H@|k\k  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) qC )VT3  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ R*X2Z{n  
#if _MSC_VER > 1000  sD8S2  
#pragma once L|X5Ru  
#endif // _MSC_VER > 1000 ZkW@|v  
vrzX%'  
class CCaptureDlg : public CDialog to3J@:V8e  
{ MbfzGYA2~  
 // Construction H#inr^Xa  
 public: 2?QJh2  
  BOOL bTray; c*dww  
  BOOL bRegistered; 9$&e~^&B  
  BOOL RegisterHotkey(); &>e DCs  
  UCHAR cKey; 0?SLRz8  
  UCHAR cMask; <^U(ya  
  void DeleteIcon(); <+gl"lG  
  void AddIcon(); 2~V Im#  
  UINT nCount; h '[vB^  
  void SaveBmp(); t\i1VXtO  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor (L$~ zw5gr  
  // Dialog Data Nz*sD^SJa  
  //{{AFX_DATA(CCaptureDlg) au|^V^m  
  enum { IDD = IDD_CAPTURE_DIALOG }; 'c&@~O;^d  
  CComboBox m_Key; AxlFU~E4  
  BOOL m_bControl; N}fUBX4k  
  BOOL m_bAlt; |A0$XU{  
  BOOL m_bShift; Da [C'm=  
  CString m_Path;  7E`(8i  
  CString m_Number; 0j(jJAE.  
  //}}AFX_DATA rxj@NwAno  
  // ClassWizard generated virtual function overrides S2E HmE&  
  //{{AFX_VIRTUAL(CCaptureDlg) p{q!jm~Nq  
 public: #}dVaXY)  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 1~DD9z  
 protected: 1?|6odc  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O[)]dD&'  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); EWIc|b:  
  //}}AFX_VIRTUAL k%}89glm  
  // Implementation QaWHz   
 protected: :z.Y$]F@  
  HICON m_hIcon; -,VhSI  
  // Generated message map functions =kh>s$We  
  //{{AFX_MSG(CCaptureDlg) JhCkkw  
  virtual BOOL OnInitDialog(); GrR0RwnH)?  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); hNnX-^J<o  
  afx_msg void OnPaint(); 0^_lj9B!  
  afx_msg HCURSOR OnQueryDragIcon(); NOr <,  
  virtual void OnCancel(); qmA2bw]  
  afx_msg void OnAbout(); ZQ~myqx,+L  
  afx_msg void OnBrowse(); R pI<]1  
  afx_msg void OnChange(); U`8 |9v  
 //}}AFX_MSG knOn UU  
 DECLARE_MESSAGE_MAP() C`n9/[,#  
}; F|?'9s*;6G  
#endif F`0c?)  
+K%pxuVh  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file s`=/fvf.  
#include "stdafx.h" Ah>gC!F^  
#include "Capture.h" ]hE +$sKd  
#include "CaptureDlg.h" dA1 C)gLi  
#include <windowsx.h> tB7K&ssi  
#pragma comment(lib,"hook.lib") %gu$_S  
#ifdef _DEBUG *)bd1B#  
#define new DEBUG_NEW ?#m<\]S<  
#undef THIS_FILE ^'&iYV  
static char THIS_FILE[] = __FILE__; ~#"7,rQp  
#endif -/UXd4S  
#define IDM_SHELL WM_USER+1 _t|G@D{   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hA*Z'.[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8nIMZV  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 5, -pBep<  
class CAboutDlg : public CDialog 2K]IlsMO&  
{ LgP>u?]n  
 public: ^r>f2 x  
  CAboutDlg(); 1t~FW-:  
  // Dialog Data 9K;k%  
  //{{AFX_DATA(CAboutDlg) =!(*5\IM  
  enum { IDD = IDD_ABOUTBOX }; N )zPxQ  
  //}}AFX_DATA T+;H#&  
  // ClassWizard generated virtual function overrides "[*S?QO(L  
  //{{AFX_VIRTUAL(CAboutDlg) mA(nyF  
 protected: EWb(uWC8h  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &_9YLXtMi;  
  //}}AFX_VIRTUAL q]"2hLq  
  // Implementation V(;55ycr  
 protected: {gFAvMj #  
  //{{AFX_MSG(CAboutDlg) #%? FM>  
  //}}AFX_MSG P>*Fj4 Z~  
  DECLARE_MESSAGE_MAP() @s%X  
}; @up&q  
;w`sz.  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) I %|@3=Yc  
{ 9ZDVy7m\i-  
 //{{AFX_DATA_INIT(CAboutDlg) 7_9+=. +X5  
 //}}AFX_DATA_INIT O87"[c`>  
} 7hB#x]oQo  
6OL41g'  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) {Q5KV%F_  
{ EKZA5J7kn  
 CDialog::DoDataExchange(pDX); MV:W@)rg  
 //{{AFX_DATA_MAP(CAboutDlg) -$+,]t^GV  
 //}}AFX_DATA_MAP -xJX_6}A  
} <7=&DpjI7F  
[34zh="o  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7\IL  
 //{{AFX_MSG_MAP(CAboutDlg) ]SFWt/<  
 // No message handlers $hh+0hs  
 //}}AFX_MSG_MAP m</]D WJ  
END_MESSAGE_MAP() bb|}'  
Hx$.9'Oq\Q  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) -i#J[>=w{C  
: CDialog(CCaptureDlg::IDD, pParent) ?4^} ;wDb2  
{ L e*`r2  
 //{{AFX_DATA_INIT(CCaptureDlg) '%R<"  
  m_bControl = FALSE; wHx}U M"  
  m_bAlt = FALSE; /K7Bae5h  
  m_bShift = FALSE; .>}BNy  
  m_Path = _T("c:\\"); *oCxof9JA  
  m_Number = _T("0 picture captured."); +A@m9  
  nCount=0; 7 0_}S*T  
  bRegistered=FALSE; )X/*($SuA  
  bTray=FALSE; j(j#0dXLh  
 //}}AFX_DATA_INIT 4S tjj!ew  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Q|?'(J+  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 13H;p[$  
} yq?]V7~  
u t$c)_  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 69>/@<   
{ Mm5c8[   
 CDialog::DoDataExchange(pDX); RT,:hH  
 //{{AFX_DATA_MAP(CCaptureDlg) wTxbDT@H5  
  DDX_Control(pDX, IDC_KEY, m_Key); E>E*ZZuhj  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 2`EVdl7B]  
  DDX_Check(pDX, IDC_ALT, m_bAlt); _BbvhWN&+  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 2HD:JdL  
  DDX_Text(pDX, IDC_PATH, m_Path); OZf6/10O/  
  DDX_Text(pDX, IDC_NUMBER, m_Number); J96uyS*  
 //}}AFX_DATA_MAP HmMO*k<6@  
} *Ddi(`  
:5J_5,?;`  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 5Tedo~v  
//{{AFX_MSG_MAP(CCaptureDlg) YScvyh?E  
 ON_WM_SYSCOMMAND() w9MoT.kI}  
 ON_WM_PAINT() 1c$vLo832  
 ON_WM_QUERYDRAGICON() qw<HY$3=  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 2VA!&`I  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) *$S#o#5  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Huc|6~X  
//}}AFX_MSG_MAP Zyu/|O g  
END_MESSAGE_MAP() wPX*%0]  
8#w)X/  
BOOL CCaptureDlg::OnInitDialog() 7b,(\Fm  
{ ZIDbqQu  
 CDialog::OnInitDialog(); _|A+ ) K  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); {]^O:i"  
 ASSERT(IDM_ABOUTBOX < 0xF000); /,2rjJ#b  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ;'0=T0\  
 if (pSysMenu != NULL) s9@Sd  
 { .fp&MgiQ  
  CString strAboutMenu; 5pfYEofK[  
  strAboutMenu.LoadString(IDS_ABOUTBOX); H>XFz(LWh  
  if (!strAboutMenu.IsEmpty()) XRxj  W  
  { `:p1&OS  
   pSysMenu->AppendMenu(MF_SEPARATOR); KnGTcoXg_  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); tlQC6Fb#  
  } ?2 f_aY ;  
 } U<^F4*G  
 SetIcon(m_hIcon, TRUE); // Set big icon U\zD,<I9  
 SetIcon(m_hIcon, FALSE); // Set small icon o:~LF6A-  
 m_Key.SetCurSel(0); bWmw3w  
 RegisterHotkey(); j/KO|iNL2  
 CMenu* pMenu=GetSystemMenu(FALSE); po7>IQS]  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); B $XwTJ>  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Ji?#.r`"n  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ~e-z,:Af  
 return TRUE; // return TRUE unless you set the focus to a control UG](go't  
} u-3:k  
5Sva}9H  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 36vgX=}  
{ cj$d=k~  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) nS9wb1Zl  
 { _MuZ4tc  
  CAboutDlg dlgAbout; 02=lsV!U  
  dlgAbout.DoModal(); r@kP*  
 } |ZiC`Nt  
 else %S \8.  
 { `\CVV*hP  
  CDialog::OnSysCommand(nID, lParam); SwW['c'*]B  
 } b?T  
} oyvKa g  
n}?wVfEy  
void CCaptureDlg::OnPaint() Gh\q^?}  
{ GpI!J}~m  
 if (IsIconic()) +?dl`!rE  
 { VUwC-)  
  CPaintDC dc(this); // device context for painting xfFg,9w8  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); gE])!GMM3  
  // Center icon in client rectangle M{mSd2  
  int cxIcon = GetSystemMetrics(SM_CXICON); U*)m' ,  
  int cyIcon = GetSystemMetrics(SM_CYICON); oD.r `]k  
  CRect rect; `$TRleSi  
  GetClientRect(&rect); 2=iH$v  
  int x = (rect.Width() - cxIcon + 1) / 2; 'hqBo|  
  int y = (rect.Height() - cyIcon + 1) / 2; &JP-O60  
  // Draw the icon B*3Y !!  
  dc.DrawIcon(x, y, m_hIcon); !mMpb/&&S  
 } bB}5U@G|  
 else `5~3G2T  
 { rsXq- Pq*  
  CDialog::OnPaint(); p B;3bc  
 } OI}cs2m  
} &(N+.T5cp  
)B$;Vs] @i  
HCURSOR CCaptureDlg::OnQueryDragIcon() = ieag7!  
{ ~j9O$s~)  
 return (HCURSOR) m_hIcon; =] C]=  
} O"G >wv  
UVQ7L9%?f  
void CCaptureDlg::OnCancel() N!2Rl  
{ /Q{P3:k  
 if(bTray) F4L;BjnJ  
  DeleteIcon(); \Ae9\Jp8M  
  CDialog::OnCancel(); x1&W^~  
} 6CbxuzYer  
pmWr]G3,*  
void CCaptureDlg::OnAbout() Av'GB  
{ CQh,~  
 CAboutDlg dlg; G 2!xPHz  
 dlg.DoModal(); &<RpWAk{  
} sarq`%zrk  
',^+bgs5  
void CCaptureDlg::OnBrowse() Uyx!E4pl(  
{ ~@.%m"<.  
 CString str; 3&&9_`r&_  
 BROWSEINFO bi; d;mx<i=/  
 char name[MAX_PATH]; A][fLlpr  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 0 &_UH}10  
 bi.hwndOwner=GetSafeHwnd(); Vv1|51B  
 bi.pszDisplayName=name; ?L&|Uw+  
 bi.lpszTitle="Select folder"; $-}e; VZb  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; *^%Q0mU[  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); I/gjenUK  
 if(idl==NULL)  -!W<DJ*  
  return; 9}a_:hAy/  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); O3DmNq$dz  
 str.ReleaseBuffer(); a2Pf/D]n  
 m_Path=str; ,JU@|`  
 if(str.GetAt(str.GetLength()-1)!='\\') G)v #+4  
  m_Path+="\\"; W6H,6v  
 UpdateData(FALSE); l<0}l^C.  
} X4l@woh%  
^j#rZ;uc   
void CCaptureDlg::SaveBmp() YQJ==C1  
{ |waIpB(  
 CDC dc; K*UgX(xu4P  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); #jA[9gWI  
 CBitmap bm; . 8N.l^0,  
 int Width=GetSystemMetrics(SM_CXSCREEN); FIxFnh3~  
 int Height=GetSystemMetrics(SM_CYSCREEN); ]I3!fEAWR  
 bm.CreateCompatibleBitmap(&dc,Width,Height); JR CrZW}  
 CDC tdc; <S?ddp2  
 tdc.CreateCompatibleDC(&dc); < -W*$?^  
 CBitmap*pOld=tdc.SelectObject(&bm); PxH72hBS  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); xk&Jl#v  
 tdc.SelectObject(pOld); {:@tQdM:i8  
 BITMAP btm; w2_bd7Wp<  
 bm.GetBitmap(&btm); b)(?qfXWP  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ?v>ET2wD  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); -46C!6a  
 BITMAPINFOHEADER bih; J+d1&Tw&  
 bih.biBitCount=btm.bmBitsPixel; hW!)w  
 bih.biClrImportant=0; Z R/#V7Pj  
 bih.biClrUsed=0; fd-q3 _f  
 bih.biCompression=0; OO[F E3F  
 bih.biHeight=btm.bmHeight; -'~ LjA(  
 bih.biPlanes=1; <! )**  
 bih.biSize=sizeof(BITMAPINFOHEADER); Hx ,0zS%>  
 bih.biSizeImage=size; }!IL]0 q  
 bih.biWidth=btm.bmWidth; ]Oq[gBL"A  
 bih.biXPelsPerMeter=0; orOt>5}b<  
 bih.biYPelsPerMeter=0; ~3uP6\F  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 5j~$Mj`  
 static int filecount=0; .tD*2  
 CString name; o,|[GhtHqs  
 name.Format("pict%04d.bmp",filecount++); [1.+H yJ}  
 name=m_Path+name; "*G.EiLq  
 BITMAPFILEHEADER bfh; R<OI1,..r  
 bfh.bfReserved1=bfh.bfReserved2=0; sc,Xw:YO  
 bfh.bfType=((WORD)('M'<< 8)|'B'); o=0]el^A  
 bfh.bfSize=54+size; =s<( P1|"  
 bfh.bfOffBits=54; HRB<Y mP@  
 CFile bf; yX~v-N!X  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ s%<eD  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [l,Ei?  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 3}e%[AKh  
  bf.WriteHuge(lpData,size); ^o7;c[E`  
  bf.Close(); M)SEn/T-  
  nCount++; 8#vc(04(  
 } :9k Ty:  
 GlobalFreePtr(lpData); fW?o@vlO  
 if(nCount==1) N<~ku<nAU  
  m_Number.Format("%d picture captured.",nCount); O{ #=d  
 else F_CYYGZ  
  m_Number.Format("%d pictures captured.",nCount); 72'5%*1  
  UpdateData(FALSE); ~6p[El#tS  
} CHz+814  
o"*AtGR+"  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) =ZqT3_  
{ G;YrF)\  
 if(pMsg -> message == WM_KEYDOWN) ti#7(^j  
 { -\C!I  
  if(pMsg -> wParam == VK_ESCAPE) i-6 Z"b{  
   return TRUE; ~c\e'&sc;  
  if(pMsg -> wParam == VK_RETURN) RsYU59_Y  
   return TRUE; t<#h$}=:Vt  
 } p|!  
 return CDialog::PreTranslateMessage(pMsg); 6Oy$gW)  
} )rC6*eR  
r(P(Rj2~  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) lv04g} W  
{ =zz ~kon9  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ S_Wrw z  
  SaveBmp(); "men  
  return FALSE; ga`3 (  
} J@u;H$@/y  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ %\:[ o  
 CMenu pop; V;v8=1t!  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ml+; Rmvb  
 CMenu*pMenu=pop.GetSubMenu(0); % yw?s0  
 pMenu->SetDefaultItem(ID_EXITICON);  a24"yT  
 CPoint pt; sfNE68I2  
 GetCursorPos(&pt); !4X f~P  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); I"ok&^t^}  
 if(id==ID_EXITICON) f.9SB  
  DeleteIcon(); p9x(D/YP0  
 else if(id==ID_EXIT) 5rU[ T ir  
  OnCancel(); OOo3G~2r  
 return FALSE; k=jk`c{<[  
} r8xv#r1  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); h-[VH%  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) $ 69oV:  
 AddIcon(); =o$sxb E(  
 return res; y]f"@9G#  
} 2I,^YWR  
9J2NH|]c  
void CCaptureDlg::AddIcon() W>j!Q^?  
{ M r5v<  
 NOTIFYICONDATA data; c_4[e5z  
 data.cbSize=sizeof(NOTIFYICONDATA); ^y<<>Y'I  
 CString tip; xjKR R?  
 tip.LoadString(IDS_ICONTIP); G U( _  
 data.hIcon=GetIcon(0); `)_dS&_\  
 data.hWnd=GetSafeHwnd(); r2,.abo  
 strcpy(data.szTip,tip); N(Fp0  
 data.uCallbackMessage=IDM_SHELL; Tu).K.p:  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; AHXSt  
 data.uID=98; oY933i@l)P  
 Shell_NotifyIcon(NIM_ADD,&data); v]B3m  
 ShowWindow(SW_HIDE); G?Q3/y(  
 bTray=TRUE; N/MUwx;P  
} 8; 0A g  
e?8HgiP-  
void CCaptureDlg::DeleteIcon() f,018]|  
{ X\bOz[\  
 NOTIFYICONDATA data; ;)D];u|_  
 data.cbSize=sizeof(NOTIFYICONDATA); xHD=\,{ig  
 data.hWnd=GetSafeHwnd(); 2#c<\s|C  
 data.uID=98; ww], y@da  
 Shell_NotifyIcon(NIM_DELETE,&data); R}*_~7r5  
 ShowWindow(SW_SHOW); 8Dj c c z  
 SetForegroundWindow(); *%%g{ 3$  
 ShowWindow(SW_SHOWNORMAL); VHIOwzC  
 bTray=FALSE; w5Y04J  
} 7/I,HxXp!  
;V*l.gr'2  
void CCaptureDlg::OnChange() a,k>Q`  
{ i3 @)W4{  
 RegisterHotkey(); ~a ]+#D  
} w9< R#y[A  
&L'Dqew,*  
BOOL CCaptureDlg::RegisterHotkey() {xXsBh Y  
{ >n'o*gZM  
 UpdateData(); 1H6<[iHW  
 UCHAR mask=0; "@iK' c^  
 UCHAR key=0; :bwjJ}F  
 if(m_bControl) y1dDO2mA  
  mask|=4; n*[XR`r}  
 if(m_bAlt) ;:\<gVi:  
  mask|=2; <G|(|E1  
 if(m_bShift) fF7bBE)L/|  
  mask|=1; `d5%.N  
  key=Key_Table[m_Key.GetCurSel()]; 1Q<^8N)pf  
 if(bRegistered){ (k5We!4[1  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); $w2u3 -  
  bRegistered=FALSE; F\KjEl0  
 } bDL,S?@  
 cMask=mask; |H;F7Y_  
 cKey=key; Qz5sxi  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ZX9TYN  
 return bRegistered; J;.wXS_U8  
} 4|riKo)  
E8$20Ue  
  四、小结 /Z'L^ L%R  
"{@A5A  
  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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