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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: 9oteQN{9  
  ")U`Wgx  
  一、实现方法 =W9;rQm  
:B=p%C  
  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: ;a+>><x]  
#![i {7  
#pragma data_seg("shareddata") <!\J([NM8  
HHOOK hHook =NULL; //钩子句柄 B 0%kq7>g  
UINT nHookCount =0; //挂接的程序数目 4QnJ;&~  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 f8E S GU  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 @|&P#wd.u  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey =>6Z"LD(  
static int KeyCount =0; 'M\ou}P  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 " [=Ee[/  
#pragma data_seg() GA6)O-^G  
:~ 3/  
  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。 3\FiQ/?  
,vQkvuz  
  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: uU`zbh}]L.  
Rww"Z=F  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 5:f}bW*  
cKey,UCHAR cMask) C ,Je>G  
{ Q]7Q4U  
 BOOL bAdded=FALSE; ]?U:8%  
 for(int index=0;index<MAX_KEY;index++){ |B4dFI?  
  if(hCallWnd[index]==0){ vKDPg p<j  
   hCallWnd[index]=hWnd; LX j Tqp'  
   HotKey[index]=cKey; B$Jn|J"/6  
   HotKeyMask[index]=cMask; }rVnuRq  
   bAdded=TRUE; +v&+8S`+  
   KeyCount++; J6Mm=bO5  
   break; mxjY-Kq  
  } A0S6 4(  
 } A]B D2   
 return bAdded; W.o W =<  
} Zx5vIm  
//删除热键 }mz4 3Sq<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) XLFJ?$)Tro  
{ 2`t4@T  
 BOOL bRemoved=FALSE; +(r8SnRX  
 for(int index=0;index<MAX_KEY;index++){ dW!T.S  
  if(hCallWnd[index]==hWnd){ l4u`R(!n5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >'Nrvy%&0  
    hCallWnd[index]=NULL; k$o6~u 2&  
    HotKey[index]=0; (a`z:dz}  
    HotKeyMask[index]=0; =g/K>B  
    bRemoved=TRUE;  2c!?!:s  
    KeyCount--; &e_M \D  
    break; Wuye:b!  
   } 'fcJ]%-=  
  } ~mK9S^[  
 } V}7I? G  
 return bRemoved; yBauK-7*c  
} F:IG3 @  
62%. ddM4  
5`6@CRef  
  DLL中的钩子函数如下: 5H==m~  
rN$_(%m_N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) athU  
{ <J{VTk ~  
 BOOL bProcessed=FALSE; =wU08}  
 if(HC_ACTION==nCode) FL0(q>$*8  
 { v2JC{XqrI  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 SMqJMirR  
   switch(wParam) A(Ugam~}  
   {  G+^HZ4jg  
    case VK_MENU: gjL>FOe8u  
     MaskBits&=~ALTBIT;  5ah]E  
     break; R(r89bTQ  
    case VK_CONTROL: cRT@Cu  
     MaskBits&=~CTRLBIT; cL<  
     break; s+C&\$E  
    case VK_SHIFT: }LDDm/$^}  
     MaskBits&=~SHIFTBIT; ?J6J#{LRd  
     break; Mh[;E'C6  
    default: //judge the key and send message Skp&W*Ai  
     break; EmVE<kY .  
   } <.s[x~b\`  
   for(int index=0;index<MAX_KEY;index++){ & 2>W=h  
    if(hCallWnd[index]==NULL) gI'4g ZH  
     continue; !m' lOz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m+"?;;s  
    { .1[K\t)2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); j2=jD G  
     bProcessed=TRUE; t]2~aK<]  
    } GO+cCNMa"  
   } &#w] 2~|  
  } arrNx|y  
  else if((lParam&0xc000ffff)==1){ //有键按下 %mt|Dl  
   switch(wParam) /F4rbL^:  
   { |t!kD(~r  
    case VK_MENU: Tc T%[h!  
     MaskBits|=ALTBIT; 1ePZs$  
     break; i~MCY.F  
    case VK_CONTROL: 25::z9i  
     MaskBits|=CTRLBIT; @vCPX=c  
     break; Jj8z~3XnJ  
    case VK_SHIFT: i"r&CS)sT  
     MaskBits|=SHIFTBIT; fOdkzD,  
     break; z\sy~DM;>  
    default: //judge the key and send message _b&Mrd  
     break; +5JCbT@y  
   } i"_)91RA  
   for(int index=0;index<MAX_KEY;index++){ *}-X '_  
    if(hCallWnd[index]==NULL) 8 T):b2h  
     continue; `kpX}cKK}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D}>pl8ke~g  
    { 26G2. /**<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); lQ<2Vw#Yl  
     bProcessed=TRUE; _[<R<&jG  
    } JN .\{ Y  
   } Vl%AN;o  
  } V}. uF,>V  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 jr|(K*;  
   for(int index=0;index<MAX_KEY;index++){ w4Qqo(  
    if(hCallWnd[index]==NULL) h3Nwxj~E  
     continue; Hzcy '  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) yM}}mypS  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); jr bEJ.  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 2?u>A3^R  
   } 5Q#;4  
  } gbsRf&4h  
 } l"5$6h  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); lM86 *g 'l  
} Sf);j0G,D  
11glFe  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: bZHuEh2w  
R7;SZo  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); uSLO"\zysX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); x%23oPM  
xphw0Es  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: J]UlCg  
r5jiB L~  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) WMnR+?q  
{ l>`N+ pZ$  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ?v-IN  
 { b Gq0k&  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 A ${b]  
  SaveBmp(); *vc=>AEc  
  return FALSE; 0,)B~|+  
 } /ZqBO*]  
 …… //其它处理及默认处理 , mEFp_a+  
} R$' 4 d  
!4GG q  
-CfGWO#Gbx  
  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。 }ddwL  
0@d)DLM?  
  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。 &dF$:$'s  
aDFu!PLB{)  
  二、编程步骤 oEbgyT gB  
u.*@ l GVW  
  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"; V#.;OtF]  
(mz5vzyw  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ;v'7l>w3\w  
b/Y9fQ n  
  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; J;h4)w~9H3  
C`+g:qT  
  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; IG0$OtG  
5%"${ywI  
  5、 添加代码,编译运行程序。 +]uW|owxo  
c|3%0=,`  
三、程序代码 s:lar4>kM  
s|rlpd4y  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Kdh(vNB>  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) qb(#{Sw0  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ .NcoST9a  
#if _MSC_VER > 1000 >Z?fX  
#pragma once vzK*1R5  
#endif // _MSC_VER > 1000 V2sWcV?  
#ifndef __AFXWIN_H__ Nv "R'Pps  
#error include 'stdafx.h' before including this file for PCH ,Q4U<`ds!  
#endif g \)+ LX  
#include "resource.h" // main symbols X).UvPZ/  
class CHookApp : public CWinApp PxzeN6f  
{ )tR5JK} AV  
 public: Uov%12  
  CHookApp(); E*ybf'  
  // Overrides (Z5=GJM?$  
  // ClassWizard generated virtual function overrides )hm U/E@  
  //{{AFX_VIRTUAL(CHookApp) 9 tkj:8_  
 public: 8^M5k%P  
  virtual BOOL InitInstance(); R5 47  
  virtual int ExitInstance(); eO;i1>  
  //}}AFX_VIRTUAL 6~zR(HzV{  
  //{{AFX_MSG(CHookApp) c_c]0Tm  
  // NOTE - the ClassWizard will add and remove member functions here. JPfNf3<@My  
  // DO NOT EDIT what you see in these blocks of generated code ! Ze ~$by|9f  
  //}}AFX_MSG UgDai?b1  
  DECLARE_MESSAGE_MAP() W[PZQCL}K)  
}; ;~T)pG8IS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); %F-/|x1#Q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;KJJK#j  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0/hX3h  
BOOL InitHotkey(); {dvrj<?  
BOOL UnInit(); }MP2)6  
#endif ='u'/g$'&  
2uFaAAT  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Hn)K;?H4  
#include "stdafx.h" vR`-iRQ?_  
#include "hook.h" 6G6Hg&B  
#include <windowsx.h> 9qD/q?Hh$  
#ifdef _DEBUG GjZ@f nF  
#define new DEBUG_NEW {:m5<6?x)  
#undef THIS_FILE q88p~Ccoa  
static char THIS_FILE[] = __FILE__; S+>&O3m  
#endif FQNhn+A  
#define MAX_KEY 100 `%AFKmc^;  
#define CTRLBIT 0x04 fHvQ9*T  
#define ALTBIT 0x02 zk5sAHQ  
#define SHIFTBIT 0x01 ;y<)RM  
#pragma data_seg("shareddata") GDw4=0u-  
HHOOK hHook =NULL; !jY/}M~F1  
UINT nHookCount =0; X5 lB],t"=  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey EceZ1b  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT D *W+0  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey C&D]!Zv F  
static int KeyCount =0; ]Vhhx`0  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 4LARqSmt  
#pragma data_seg() %8/Gsu;  
HINSTANCE hins; S<Q8kW:  
void VerifyWindow(); $t.N |b`'  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) toPA@V  
//{{AFX_MSG_MAP(CHookApp) 2g-'.w  
// NOTE - the ClassWizard will add and remove mapping macros here. /' L20aN2  
// DO NOT EDIT what you see in these blocks of generated code! ~6U@*Svk  
//}}AFX_MSG_MAP qTC`[l  
END_MESSAGE_MAP() *{W5QEa  
O/_} O_rR  
CHookApp::CHookApp() 9bgKu6-X  
{ R*.XbkW~  
 // TODO: add construction code here, deaxb8'7  
 // Place all significant initialization in InitInstance 9;dP7o  
} F<BhN+U  
N;A1e@bP  
CHookApp theApp; 1mOZ\L!m*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ]w%7/N0R  
{ iJ42` 51  
 BOOL bProcessed=FALSE; 7qon:]b4  
 if(HC_ACTION==nCode) H:U1#bQQ:  
 { C JiMg'K  
  if((lParam&0xc0000000)==0xc0000000){// Key up Bx E1Ky8@A  
   switch(wParam) }llzO  
   { *Dh.'bB!  
    case VK_MENU: ig; ~ T  
     MaskBits&=~ALTBIT; 8 /b_4!5c  
     break; |F<U;xV$p  
    case VK_CONTROL: cgYMo{R3  
     MaskBits&=~CTRLBIT; Y8.0R-:ZAN  
     break; h1fJ`WT6,  
    case VK_SHIFT: fouy??  
     MaskBits&=~SHIFTBIT; \#tr4g~u  
     break; #.9Xkn9S  
    default: //judge the key and send message tl;?/  
     break; C'n 9n!hR  
   } 8i-?\VZD  
   for(int index=0;index<MAX_KEY;index++){ 6e  |  
    if(hCallWnd[index]==NULL) 1{o CMq/v  
     continue; 'ZT!a]4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) P%Q}R[Q  
    { U@& <5'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2_r}4)z  
     bProcessed=TRUE; 54uTu2  
    } =AgY8cF!sl  
   } pe,c  
  } #l;Ekjfz  
  else if((lParam&0xc000ffff)==1){ //Key down pKEMp&geo  
   switch(wParam) U45/%?kE)  
   { JB%6G|Z  
    case VK_MENU: G#dpSNV3|  
     MaskBits|=ALTBIT; GmAE!+"  
     break; J)jiI>  
    case VK_CONTROL: ^~BJu#uVyy  
     MaskBits|=CTRLBIT; G>:l(PW:  
     break; uT-WQ/id  
    case VK_SHIFT: \Z+v\5nmO  
     MaskBits|=SHIFTBIT; WM@uxe,  
     break; X]1ep  
    default: //judge the key and send message t9K.Jc0  
     break; }FM<uBKW  
   } Do_L  
   for(int index=0;index<MAX_KEY;index++) r<|\4zIo/  
   { m};_\Db`  
    if(hCallWnd[index]==NULL) }U^9(  
     continue; ww\/$ |  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RhQOl9  
    { 2>EIDRLJ-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); F`u{'w:Hv  
     bProcessed=TRUE; Nc"h8p?  
    } v>nJy~O]  
   } %pwm34  
  } }`_2fJ6  
  if(!bProcessed){ Q'|cOQX  
   for(int index=0;index<MAX_KEY;index++){ U{O\  
    if(hCallWnd[index]==NULL) L7jz^g^  
     continue; {M%"z,GL7J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Pc(2'r@#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); h h8UKEM-  
   } G2jEwi  
  } ($cu!$lY~  
 } S`6'~g  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); A?7%q^;E  
} D8dTw{C  
2i>xJMW  
BOOL InitHotkey() #qn)Nq(  
{ {T^'&W>8G8  
 if(hHook!=NULL){ C$%QVcf  
  nHookCount++; !^LvNW\|  
  return TRUE; w{r ->Phe  
 } 8:A<PV!+  
 else 7}lZa~/  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); BF_k~  
  if(hHook!=NULL) {jc~s~<#  
   nHookCount++; 6?a(@<k_  
  return (hHook!=NULL); L;`4"  
} 9M!_D?+P?  
BOOL UnInit() siG?Sd_2  
{ yNT2kB'  
 if(nHookCount>1){ JDhA{VN6  
  nHookCount--; wM yPR_  
  return TRUE; %-*vlNC)  
 } ,U tw!]  
 BOOL unhooked = UnhookWindowsHookEx(hHook); }3*h`(Bv7  
 if(unhooked==TRUE){ 54;iLL  
  nHookCount=0; 2+P3Sii  
  hHook=NULL; RSi0IfG5  
 } K;97/"  
 return unhooked; ef. lM]cO  
} ,yqzk.  
{xykf7zp  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) c,-x}i0c  
{ C>u 3n^  
 BOOL bAdded=FALSE; SB'YV#--  
 for(int index=0;index<MAX_KEY;index++){ Nb8<8O ^  
  if(hCallWnd[index]==0){ Y5NbY02E  
   hCallWnd[index]=hWnd; F*w|/-e  
   HotKey[index]=cKey; B~aOs>1 S]  
   HotKeyMask[index]=cMask; 2(rZ@Wl  
   bAdded=TRUE; RP X`2zr  
   KeyCount++; b(yO  
   break; F@*lR(4C  
  } /j)VES  
 } 6m" 75  
 return bAdded; %~;Q_#CR/K  
} |)4$\<d  
1;xw)65  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) W@C56fCa  
{ 0C p}  
 BOOL bRemoved=FALSE; _]S6>  
 for(int index=0;index<MAX_KEY;index++){ p)^:~ ll  
  if(hCallWnd[index]==hWnd){ YJ^ lM\/<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 9HE(*S  
    hCallWnd[index]=NULL; RsD`9>6)  
    HotKey[index]=0; eq+o_R}CS  
    HotKeyMask[index]=0; L@4zuzmlb  
    bRemoved=TRUE; p<zXuocQ  
    KeyCount--; |Hm'.-   
    break; ^'fKey`  
   } :.Qe=}9  
  } +.lWck  
 } D,n}Qf!GYk  
 return bRemoved; 8$v7|S6 z  
} _o?(t\B9{  
tv OAN|+F  
void VerifyWindow() 9f^PR|F  
{ mVK9NK  
 for(int i=0;i<MAX_KEY;i++){ &7T H V  
  if(hCallWnd!=NULL){ 8-"5|pNc  
   if(!IsWindow(hCallWnd)){ _0*>I1F~  
    hCallWnd=NULL; [/Z'OV"tU  
    HotKey=0; E)JyKm.  
    HotKeyMask=0; l>UUaf|O  
    KeyCount--; 0c61q Q6  
   } 1mJ_I|98  
  } n6-Ic',;  
 } &7w>K6p  
} ~Ex.Yp8.  
_qeuVi=A  
BOOL CHookApp::InitInstance() K) `:v|d  
{ ZGpTw[5ql  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); a9Fm Y`  
 hins=AfxGetInstanceHandle(); T#n1@FgC  
 InitHotkey(); v$m[#&O^V?  
 return CWinApp::InitInstance();  aoDD&JE  
} s!'A\nVV1$  
o~x39  
int CHookApp::ExitInstance() eq~c  
{ Yb\\ w<@g  
 VerifyWindow(); q Iy^N:C2'  
 UnInit(); v"r9|m~'  
 return CWinApp::ExitInstance();  l}0V+  
} +F o$o  
"P'&+dH8  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ],F}}pv  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) V 7l{hEo3?  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 1_NG+H]x9  
#if _MSC_VER > 1000 i.t9jN  
#pragma once r)p2'+}pV  
#endif // _MSC_VER > 1000 |jk-@ Z*  
oZTgN .q  
class CCaptureDlg : public CDialog q7X}MAW  
{ .L9']zXc`  
 // Construction KH7VR^;mk  
 public: XJqTmj3   
  BOOL bTray; .VT;H1#  
  BOOL bRegistered; t3PtKgP-6  
  BOOL RegisterHotkey(); Btj#EoSI_  
  UCHAR cKey; aaDP9FW9e  
  UCHAR cMask; t\h$&[[l'z  
  void DeleteIcon(); wV(AT$  
  void AddIcon(); M)&Io6>  
  UINT nCount; I>PZYh'.T  
  void SaveBmp(); ~+yZfOcw  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor vCw<G6tD  
  // Dialog Data 5W/{h q8}}  
  //{{AFX_DATA(CCaptureDlg) QK)){ cK  
  enum { IDD = IDD_CAPTURE_DIALOG }; 7R}9oK_I  
  CComboBox m_Key; .evbE O5  
  BOOL m_bControl; u*3NS$vH  
  BOOL m_bAlt; f-Jbs`(+  
  BOOL m_bShift; {C3U6kKs;R  
  CString m_Path; "#yJHsu]  
  CString m_Number; ? B@&#E!/f  
  //}}AFX_DATA bLzs?eos  
  // ClassWizard generated virtual function overrides ='Q{R*u  
  //{{AFX_VIRTUAL(CCaptureDlg) )VSwT x&  
 public: bB!#:j>(v  
  virtual BOOL PreTranslateMessage(MSG* pMsg); y<pnp?x4  
 protected: tF*szf|$-  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support As~(7?]r  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); =pcF:D#+  
  //}}AFX_VIRTUAL 7FLXx?nLY  
  // Implementation r> k-KdS  
 protected: O~!T3APGU  
  HICON m_hIcon; Wy4$*$  
  // Generated message map functions VIC0}LT0R  
  //{{AFX_MSG(CCaptureDlg) ]5}=^  
  virtual BOOL OnInitDialog(); %@Oma  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); "9IYB)Js  
  afx_msg void OnPaint(); '$G"[ljr  
  afx_msg HCURSOR OnQueryDragIcon(); +x=)/;:  
  virtual void OnCancel(); Fk "Ee&H)(  
  afx_msg void OnAbout(); L[g0&b%%-  
  afx_msg void OnBrowse(); FdzNE  
  afx_msg void OnChange(); b&#DnZcf  
 //}}AFX_MSG lx |5?P  
 DECLARE_MESSAGE_MAP()  7I=C+  
}; `Out(Hn  
#endif ,.iRnR  
%^sTU4D5  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [(X y.L7x  
#include "stdafx.h" 'c2W}$q  
#include "Capture.h" =4V&*go*\  
#include "CaptureDlg.h" *B`Zq)  
#include <windowsx.h> gE#>RM5D  
#pragma comment(lib,"hook.lib") j',W 64  
#ifdef _DEBUG k@zy  
#define new DEBUG_NEW v+p {|X-  
#undef THIS_FILE d->|EJP  
static char THIS_FILE[] = __FILE__; XO#/Fv!  
#endif rX_@Ihv'  
#define IDM_SHELL WM_USER+1 X%z }VA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +$4(zP s@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); L,y6^J!  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Z^ }mp@j>  
class CAboutDlg : public CDialog infl.  
{ )u))n#P  
 public: zp\8_U @  
  CAboutDlg(); |,9JNm$  
  // Dialog Data #/PAA  
  //{{AFX_DATA(CAboutDlg) afjtn_IB  
  enum { IDD = IDD_ABOUTBOX }; !.2<| 24  
  //}}AFX_DATA 8.F~k~srA  
  // ClassWizard generated virtual function overrides F, U*yj  
  //{{AFX_VIRTUAL(CAboutDlg) @SCI"H%[  
 protected: J>fQNW!{  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +"9hWb5  
  //}}AFX_VIRTUAL g^*<f8 ~d  
  // Implementation ;^t{Il'j  
 protected: N0hE4t  
  //{{AFX_MSG(CAboutDlg) dJ$"l|$$  
  //}}AFX_MSG fXrXV~'8  
  DECLARE_MESSAGE_MAP() 93t9^9  
}; _|h8q-[3  
f0Bto/,>~  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) LU!dN"[k  
{ h-iJlm  
 //{{AFX_DATA_INIT(CAboutDlg) rG,5[/l  
 //}}AFX_DATA_INIT 3u%{dGa  
} j+>J,axU!  
Gy=B&boZ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) G)?9.t_Lj-  
{ gV&z2S~"  
 CDialog::DoDataExchange(pDX); +`?Y?L^ J  
 //{{AFX_DATA_MAP(CAboutDlg) Y*mbjyt[?X  
 //}}AFX_DATA_MAP ge]STSM0n7  
} h iNEJ_f  
LC1 (Xb f  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7 |DHplI  
 //{{AFX_MSG_MAP(CAboutDlg) gZ5[ C  
 // No message handlers >0Q|nCx  
 //}}AFX_MSG_MAP ~]ZpA-*@Ut  
END_MESSAGE_MAP() N !TW!  
(O0Urm  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) R|i/lEq  
: CDialog(CCaptureDlg::IDD, pParent) Da"j E  
{ <n3!{w3<  
 //{{AFX_DATA_INIT(CCaptureDlg) s-dLZ.9F  
  m_bControl = FALSE; B"%{i-v>**  
  m_bAlt = FALSE; AT5aDEb^^  
  m_bShift = FALSE; &89 oO@5  
  m_Path = _T("c:\\"); 0uBl>A7qhn  
  m_Number = _T("0 picture captured."); wEzKqD  
  nCount=0; i<pk6rO1  
  bRegistered=FALSE; mKYeD%Pm*  
  bTray=FALSE; 3sd"nR?aX  
 //}}AFX_DATA_INIT odIZo|dv  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 42]pYm(jk3  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;WldHaZ9r  
} ^MBm==heL  
=4h+ M$2  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX)  ~c6}  
{ fGmT_C0t  
 CDialog::DoDataExchange(pDX); SNY~9:;]f  
 //{{AFX_DATA_MAP(CCaptureDlg) #s!'+|2n  
  DDX_Control(pDX, IDC_KEY, m_Key); TX#m&vh  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); P./VmY'  
  DDX_Check(pDX, IDC_ALT, m_bAlt); {3&|tk!*  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); QBR=0(giF  
  DDX_Text(pDX, IDC_PATH, m_Path); Rb\6;i8R  
  DDX_Text(pDX, IDC_NUMBER, m_Number); WJ*n29^N^h  
 //}}AFX_DATA_MAP /lafve~  
} y\&>Z yOY  
np~~mdmRK  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) MxBTX4ES  
//{{AFX_MSG_MAP(CCaptureDlg) N/GQt\tV<  
 ON_WM_SYSCOMMAND() Y#g4$"G9  
 ON_WM_PAINT() TRsE %  
 ON_WM_QUERYDRAGICON() /T. KbLx~q  
 ON_BN_CLICKED(ID_ABOUT, OnAbout)  6m6zA/  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) <8,cuX\  
 ON_BN_CLICKED(ID_CHANGE, OnChange) xU%w=0z <  
//}}AFX_MSG_MAP E= `6-H{  
END_MESSAGE_MAP() 1T:Y0  
6 PxW8pn  
BOOL CCaptureDlg::OnInitDialog() @^uH`mc  
{ 8uA,iYD  
 CDialog::OnInitDialog(); umdG(osR  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 5O`dO9g}$  
 ASSERT(IDM_ABOUTBOX < 0xF000); Hk|0HL  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ;[a|9TPR  
 if (pSysMenu != NULL) r7Ya\0gU  
 { Gt wT  
  CString strAboutMenu; C)cwAU|h#  
  strAboutMenu.LoadString(IDS_ABOUTBOX); / Wf^hA  
  if (!strAboutMenu.IsEmpty()) F4e:ZExJ  
  {  TT-h;'nJ  
   pSysMenu->AppendMenu(MF_SEPARATOR); ApjOj/  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); zq%D/H6J,  
  } frBX{L  
 } !Kv@\4  
 SetIcon(m_hIcon, TRUE); // Set big icon (!:cen~|[  
 SetIcon(m_hIcon, FALSE); // Set small icon )Z %T27r,^  
 m_Key.SetCurSel(0); JAI)Eqqv]  
 RegisterHotkey();  aH#l9kCb  
 CMenu* pMenu=GetSystemMenu(FALSE); bMU(?hb  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); +&["HoKg}&  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); b=/curl&  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); H)(:8~c,p  
 return TRUE; // return TRUE unless you set the focus to a control ;>mCalwj  
} 2}W0 F2*  
YZ+RWu9K  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #0Tq=:AE>  
{ Bphof0{<}  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) cm[c ze+*  
 { SRSvot};C  
  CAboutDlg dlgAbout; 57 #6yXQ  
  dlgAbout.DoModal(); sCu+Lg~f  
 } aj}(E +  
 else 1@lJonlF  
 { |`jjHuQ;  
  CDialog::OnSysCommand(nID, lParam); Zy09L}59P  
 } r/*=%~*  
} oP4GEr  
xai4pF-?  
void CCaptureDlg::OnPaint() 2W$cFC  
{ B^^r\L9  
 if (IsIconic()) K5"#~\D  
 { )*:`':_a  
  CPaintDC dc(this); // device context for painting Dwl3 Cj  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); pBw0"ff  
  // Center icon in client rectangle S~Id5T:,  
  int cxIcon = GetSystemMetrics(SM_CXICON); lvp8z) G  
  int cyIcon = GetSystemMetrics(SM_CYICON); =V^.}WtO  
  CRect rect; B7"PIkk;  
  GetClientRect(&rect); 7-BvFEM;  
  int x = (rect.Width() - cxIcon + 1) / 2; RW P<B0)  
  int y = (rect.Height() - cyIcon + 1) / 2; X_v[MW  
  // Draw the icon `g,8-  
  dc.DrawIcon(x, y, m_hIcon); G-T0f  
 } 6eokCc"o  
 else C2{lf^9:&  
 { D0N9Ksq  
  CDialog::OnPaint(); \);4F=h}f  
 } BAO|)~1Pd  
} J sEa23  
XQ*eP?OS{  
HCURSOR CCaptureDlg::OnQueryDragIcon() d,by / .2  
{ q=lAb\i  
 return (HCURSOR) m_hIcon; vpU#xm.K  
} r4,VTy2Qe  
?^j^K-rx  
void CCaptureDlg::OnCancel() $u/E\l  
{ +NFzSal  
 if(bTray) z ;u  
  DeleteIcon(); <ioO,oS'  
  CDialog::OnCancel(); F H1Z 2  
} |g3?y/l  
>YUoh-]`  
void CCaptureDlg::OnAbout() rhL"i^  
{ ,E.' o=Z  
 CAboutDlg dlg; F"N60>>  
 dlg.DoModal(); #M!!CX*k  
} /W<>G7%.  
eu|j=mB  
void CCaptureDlg::OnBrowse() 4hw@yTUo  
{ A0%}v*  
 CString str; +,2Jzl'-  
 BROWSEINFO bi; $TI5vhQ  
 char name[MAX_PATH]; U8(Nk\"X\  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); +<prgP`v  
 bi.hwndOwner=GetSafeHwnd(); ;us%/kOR  
 bi.pszDisplayName=name; ",)Qc!^P$  
 bi.lpszTitle="Select folder"; aTzjm`F0  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; !cGDy/ |  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); jP~Z`y f  
 if(idl==NULL) rS1fK1dy s  
  return; *Y@nVi  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); RyRpl*^  
 str.ReleaseBuffer(); b$eXFi/  
 m_Path=str; t^ZV|s 1  
 if(str.GetAt(str.GetLength()-1)!='\\') }y%oT P&  
  m_Path+="\\"; [{r}u  
 UpdateData(FALSE); &gI~LP  
} i>[_r,-\[  
u=YX9Mo!  
void CCaptureDlg::SaveBmp() Qeu\&%C!<  
{ ?h!i0Rsm  
 CDC dc; }za[E>z  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); *|_"W+JC  
 CBitmap bm; a {ab*tM  
 int Width=GetSystemMetrics(SM_CXSCREEN); ^GBe)~MT  
 int Height=GetSystemMetrics(SM_CYSCREEN); n$[f94d=  
 bm.CreateCompatibleBitmap(&dc,Width,Height); DD44"w_9  
 CDC tdc; s[gKc'  
 tdc.CreateCompatibleDC(&dc); XW?b\!@ $  
 CBitmap*pOld=tdc.SelectObject(&bm); ]x&u`$F  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); z5bo_Eq  
 tdc.SelectObject(pOld); "@9? QI}  
 BITMAP btm; <9sO  
 bm.GetBitmap(&btm); F,5r9^,_  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; }$\M{# C~  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); "z<azs  
 BITMAPINFOHEADER bih; Od?qz1  
 bih.biBitCount=btm.bmBitsPixel; -LM;}<  
 bih.biClrImportant=0; hva2o`  
 bih.biClrUsed=0; <A9y9|>o  
 bih.biCompression=0; ^;c16  
 bih.biHeight=btm.bmHeight; vzn{h)D  
 bih.biPlanes=1; ,/O[=9l36R  
 bih.biSize=sizeof(BITMAPINFOHEADER); v2,%K`pAU  
 bih.biSizeImage=size; j|tC@0A  
 bih.biWidth=btm.bmWidth; `nO71mo  
 bih.biXPelsPerMeter=0; z_ =Bt  
 bih.biYPelsPerMeter=0; zS< jd~  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Ez{MU@Fk  
 static int filecount=0; <[GYLN[0Q  
 CString name; L>Mpi$L  
 name.Format("pict%04d.bmp",filecount++); C%~a`e|/Y  
 name=m_Path+name; wZh:F !  
 BITMAPFILEHEADER bfh; [Ei1~n)o  
 bfh.bfReserved1=bfh.bfReserved2=0; DKVT(#@T  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Ys8SDlMo  
 bfh.bfSize=54+size; Kq.:G%  
 bfh.bfOffBits=54; OMk5{-8B  
 CFile bf; 0[<~?`:)  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 5b/ojr7  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Il`tNr  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); U=8@@ yE  
  bf.WriteHuge(lpData,size); i*eAdIi  
  bf.Close(); TPE:e)GO  
  nCount++; s s 3t  
 } Rte+(- iL  
 GlobalFreePtr(lpData); {J5JYdK  
 if(nCount==1) _p?s9&  
  m_Number.Format("%d picture captured.",nCount); FecktD=  
 else 5( _6+'0  
  m_Number.Format("%d pictures captured.",nCount); \(p{t  
  UpdateData(FALSE); %c)[ kAU!  
} \Ey~3&x9f  
Dr;iQkGP  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) MlW 8t[  
{ _ IeU+tS  
 if(pMsg -> message == WM_KEYDOWN) 71C42=AU  
 { 6bBdIqGb}  
  if(pMsg -> wParam == VK_ESCAPE) U1_&gy @y  
   return TRUE; /=?ETth @  
  if(pMsg -> wParam == VK_RETURN) U.T|   
   return TRUE; XR0O;JN  
 } S-+M;@'Rl  
 return CDialog::PreTranslateMessage(pMsg); %PJhy2  
} ftBq^tC  
$<p8TtI=YQ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) h.K(P+h  
{ YRlDX:oX~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [Vf}NF  
  SaveBmp(); _7a'r</@  
  return FALSE; Q:6VYONN  
} ESb ]}c:  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ O3V.^_k;  
 CMenu pop; YDmWN#  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); E2B>b[  
 CMenu*pMenu=pop.GetSubMenu(0);  j<"nO(  
 pMenu->SetDefaultItem(ID_EXITICON); KjB/.4lLq  
 CPoint pt; woq)\;CK  
 GetCursorPos(&pt); YxJD_R  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); _{~]/k  
 if(id==ID_EXITICON) G%u9+XV1#  
  DeleteIcon(); nT#JOmv  
 else if(id==ID_EXIT) x|eeRf|  
  OnCancel(); s~26  
 return FALSE; @6o]chJo  
} djT5 X  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); d77r9  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) N_75-S7Cm  
 AddIcon(); # fhEc;t  
 return res; ^%y`u1ab  
} N]5m(@h  
mCKk*5ws5"  
void CCaptureDlg::AddIcon() H;WY!X$x  
{ 8Z85D  
 NOTIFYICONDATA data; =neL}Fav56  
 data.cbSize=sizeof(NOTIFYICONDATA); GJ 'spgz  
 CString tip; OY"6J@[z  
 tip.LoadString(IDS_ICONTIP); o/^;@5\  
 data.hIcon=GetIcon(0); TJ6#P<M  
 data.hWnd=GetSafeHwnd(); 59Sw+iZj  
 strcpy(data.szTip,tip); NHX>2-b  
 data.uCallbackMessage=IDM_SHELL; \Btk;ivg  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; > 8]j  
 data.uID=98; rn.\tDeA  
 Shell_NotifyIcon(NIM_ADD,&data); cy~oPj]j  
 ShowWindow(SW_HIDE); j?n+>/sG,  
 bTray=TRUE; AW5iV3  
} y,+[$u7h  
@LLTB(@wR  
void CCaptureDlg::DeleteIcon() e<gx~N9l'  
{ U=Bn>F}y\  
 NOTIFYICONDATA data; >qT'z$  
 data.cbSize=sizeof(NOTIFYICONDATA); IPA*-I57  
 data.hWnd=GetSafeHwnd(); k5+]SG`]]  
 data.uID=98; ;BH>3VK  
 Shell_NotifyIcon(NIM_DELETE,&data); "r.2]R3  
 ShowWindow(SW_SHOW); o4=Yu7L  
 SetForegroundWindow(); Gk~l,wV>  
 ShowWindow(SW_SHOWNORMAL); 1K|@ h&@  
 bTray=FALSE; kReG:  
} "PpjoM ~  
\Mi#{0f+q  
void CCaptureDlg::OnChange() bdc\  
{ i RmQ5ezk  
 RegisterHotkey();  [~Hg}-c  
} 0o&}mKe  
<xS=#  
BOOL CCaptureDlg::RegisterHotkey() lWy=)^)4  
{ SlT*C6f  
 UpdateData(); =;c_} VY  
 UCHAR mask=0; B!aK  
 UCHAR key=0; a}.Y!O&  
 if(m_bControl) :\V,k~asl  
  mask|=4; ]@xL=%   
 if(m_bAlt) m[2'd  
  mask|=2; S-E++f9D~  
 if(m_bShift) 6 o[/F3`  
  mask|=1; 2f:Mm'XdB  
  key=Key_Table[m_Key.GetCurSel()]; =g@9>3~{!  
 if(bRegistered){ nbvkP  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); V"d=.Hb>  
  bRegistered=FALSE; Pl~P-n  
 } Gm=>!.p  
 cMask=mask; J l7z|QS  
 cKey=key; H)JS0 G0  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); {sS_|sX  
 return bRegistered; Go+[uY^  
} `n-vjjG%#  
&y:CW>T$/X  
  四、小结 <Dw]yGK@  
6 `puTL?  
  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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