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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: $My~sN8  
  4#:C t* f  
  一、实现方法 &0H_W xKeB  
;*ni%|K  
  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: Wyow MFp  
7#Uzz"^  
#pragma data_seg("shareddata") Mvp|S.  
HHOOK hHook =NULL; //钩子句柄 I$4>_D  
UINT nHookCount =0; //挂接的程序数目 'Sesh'2 /  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 X?;iSekI4  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 C\OZs%]At  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Se37-  
static int KeyCount =0; W}%"xy]N  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ?YUL~P  
#pragma data_seg() V DZOJM)(  
]EUQMyR  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 Z[B:6\oQ  
E|jU8qz>P  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: l2YA/9.  
,?HM5c{'[Y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR )jt?X}  
cKey,UCHAR cMask) 0c8_&  
{ MOay^{u  
 BOOL bAdded=FALSE; NFC/4  
 for(int index=0;index<MAX_KEY;index++){ C\vOxBAB  
  if(hCallWnd[index]==0){ ,yvS c  
   hCallWnd[index]=hWnd; t OxH9  
   HotKey[index]=cKey; d0&  
   HotKeyMask[index]=cMask; FMhuCl2  
   bAdded=TRUE; )heHERbJ  
   KeyCount++; ,}"jiGgS4  
   break; @ &Od1X  
  } 2@@evQ  
 } P2| +7D:  
 return bAdded; uu"hu||0_  
} k@h0 }%  
//删除热键 P=L@!F+s  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]!N=Z }LD  
{ mdo$d-d&  
 BOOL bRemoved=FALSE; 4sW~7:vU  
 for(int index=0;index<MAX_KEY;index++){ cMoJHC,!  
  if(hCallWnd[index]==hWnd){ -t>"s'kv  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]0[ot$Da6  
    hCallWnd[index]=NULL; %iJ}H6m  
    HotKey[index]=0; JfK4|{@  
    HotKeyMask[index]=0; SU6Aq?`@  
    bRemoved=TRUE; ^HtB!Xc  
    KeyCount--; Pl-9FLJ  
    break; [hk/Rp7{  
   } %Pj}  
  } ~*UY[!+4^=  
 } 7,8TMd1`M  
 return bRemoved; 8?x:PkK  
} pYu6[  
/L5:/Z  
Y>ATL  
  DLL中的钩子函数如下: 3-)}.8F  
uPxjW"M+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) g5u4|+70  
{ LafBf6wds  
 BOOL bProcessed=FALSE;  pn) {v  
 if(HC_ACTION==nCode) 0 0|!g"E>$  
 { B7YE+  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 .+<Ka0  
   switch(wParam) 065=I+Vo  
   {  0PsQ 1[1  
    case VK_MENU: zA:q/i  
     MaskBits&=~ALTBIT; jUgx ;=  
     break; A wk1d  
    case VK_CONTROL: ; sqxFF@  
     MaskBits&=~CTRLBIT; zK{}   
     break; ?r5a*  
    case VK_SHIFT: 9_e_Ne`i`?  
     MaskBits&=~SHIFTBIT; 3(vm'r&5n>  
     break; ='_3qn.  
    default: //judge the key and send message i\gt @  
     break; 79-5 0}A  
   } x; -D}#  
   for(int index=0;index<MAX_KEY;index++){ }UQ,B  
    if(hCallWnd[index]==NULL) @LDs$"f9=  
     continue; j]]5&u/l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qDhZC*"9#D  
    { X8?@Y@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); IiE^HgM  
     bProcessed=TRUE; DUH_LnHw)  
    } Q9B!0G.-bs  
   } Dhfor+Epy  
  }  6pfkv2.}  
  else if((lParam&0xc000ffff)==1){ //有键按下 &GvSgdttv  
   switch(wParam) ~l{Qz0&  
   { W}}ZP];  
    case VK_MENU: ! hEZV&y  
     MaskBits|=ALTBIT; nZc6 *jiz  
     break; m_BpY9c]5  
    case VK_CONTROL: 7Kb&BF|Q  
     MaskBits|=CTRLBIT; C8)Paop$  
     break; Aayd3Ph0%  
    case VK_SHIFT: ,dw\y/dn  
     MaskBits|=SHIFTBIT; {;zHkmx  
     break; o@]n<ZYo  
    default: //judge the key and send message _x#y   
     break; TXS`ey  
   } 3>73s}3  
   for(int index=0;index<MAX_KEY;index++){ L~by`q N_  
    if(hCallWnd[index]==NULL) jG)66E*"  
     continue; Y9vVi]4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *yo'Nqu  
    { p9mGiK4!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Q)qJ6-R|HD  
     bProcessed=TRUE; nn$^iw`  
    } EM!S ;i  
   } s*Z yr%R  
  } !|]k2=+I  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ,Mi'NO   
   for(int index=0;index<MAX_KEY;index++){ /BvMNKb$$  
    if(hCallWnd[index]==NULL) TcJJ"[0  
     continue; Qz%q#4Zb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Zr A*MN  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (x.qyYEoI  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Fi\) ka\u  
   } NLYf   
  } x2aG5@<3  
 } -f1}N|hy  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;X0uA?  
} ;:ZD<'+N  
qQO*:_ezzk  
  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: 99,=dzm  
D!Nc&|X^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .h4Z\R`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v)nv"o[  
{#`wW`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: R~hIoaiN  
Z?3B1o9  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) m(kv:5<>  
{ R\#5;W^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) H1KXAy`&  
 { R[fQ$` M  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 c'Z)uquvP  
  SaveBmp(); TL7qOA7^X  
  return FALSE; h^`@%g9 S  
 } EM +! ph  
 …… //其它处理及默认处理 T2)CiR-b  
} Us pv^O9_  
P c5C*{C  
|E||e10wR  
  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。 uGW#z_{(n  
B> \q!dX3  
  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。 0oBAJP  
0]]OE+9<c  
  二、编程步骤 ba ,n/yH  
o_kZ  
  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"; a\Gd;C ^`  
Nl%5OBm  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Ukf:m&G  
0JR)-*  
  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; )"M;7W?R0  
XtBEVqrhi  
  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; R"CF xo  
`zl,|}u)  
  5、 添加代码,编译运行程序。 BePb8 k<y  
?@`5^7*  
三、程序代码 $*P +   
XbFo#Pwk  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL lU&2K$`  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9(vp`Z8B4  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ EQZ/v gho  
#if _MSC_VER > 1000 .RmoO\ ,Gm  
#pragma once p<l+js(5|  
#endif // _MSC_VER > 1000 !,5qAGi0  
#ifndef __AFXWIN_H__ DZb0'+jQ  
#error include 'stdafx.h' before including this file for PCH aM,g@'.=  
#endif T%Zfo7  
#include "resource.h" // main symbols 6Rq +=X  
class CHookApp : public CWinApp e},:QL0X  
{ xt`a":lru  
 public: HL>l.IG?  
  CHookApp();  :fy,%su  
  // Overrides _z.CV<  
  // ClassWizard generated virtual function overrides s*i,Ph  
  //{{AFX_VIRTUAL(CHookApp) Lk^bzW>f  
 public: Tkp"mT v?<  
  virtual BOOL InitInstance(); 4mX]JH`UTe  
  virtual int ExitInstance(); L5 Ai  
  //}}AFX_VIRTUAL dWwb}r(ky  
  //{{AFX_MSG(CHookApp) hg'eSU$J  
  // NOTE - the ClassWizard will add and remove member functions here. ^%g 8OP  
  // DO NOT EDIT what you see in these blocks of generated code ! r( wtuD23q  
  //}}AFX_MSG Zc&pJP+M'U  
  DECLARE_MESSAGE_MAP() |gINB3L  
}; z\K %  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); P#8lO%;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8+(wAbp  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Tgi7RAY  
BOOL InitHotkey(); 5N ;xo??  
BOOL UnInit(); WUQa2$.  
#endif \X]I: 0^j  
}20tdD ~  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 2@HmZ!|Q  
#include "stdafx.h" O]F(vHK\   
#include "hook.h" +x4*T  
#include <windowsx.h> 4ISIg\:c*  
#ifdef _DEBUG [kgCB7.V  
#define new DEBUG_NEW H&k&mRi  
#undef THIS_FILE G'nSnw  
static char THIS_FILE[] = __FILE__; 0XyPG  
#endif [E2".F3  
#define MAX_KEY 100 UalwK  
#define CTRLBIT 0x04 "EWq{l_I5$  
#define ALTBIT 0x02 ;9J6)zg !n  
#define SHIFTBIT 0x01 .uN(44^+x  
#pragma data_seg("shareddata") uLI;_,/:  
HHOOK hHook =NULL; JZ-64OT  
UINT nHookCount =0; G[OJ <px  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey qk0cf~ gz  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Rx.5;2m  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey h_\W7xt  
static int KeyCount =0; Lc-Wf zT  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift &rG]]IO  
#pragma data_seg() iP$>/[I  
HINSTANCE hins; +9<:z\B|  
void VerifyWindow(); X"HVK+  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) />>KCmc  
//{{AFX_MSG_MAP(CHookApp) RcO.1@2  
// NOTE - the ClassWizard will add and remove mapping macros here. [?2?7>D8  
// DO NOT EDIT what you see in these blocks of generated code! u'Hh||La"  
//}}AFX_MSG_MAP X~\O]  
END_MESSAGE_MAP() N1vA>(2A  
^EmePkPI  
CHookApp::CHookApp() iT{[zLz>1  
{ I;, n|o  
 // TODO: add construction code here, *F(<:3;2  
 // Place all significant initialization in InitInstance u`!Dp$P  
} ~= otdJ  
8e`HXU(A  
CHookApp theApp; .&>3nu  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >f|0# *  
{ [w+1<ou;j  
 BOOL bProcessed=FALSE; u{l4O1k/c  
 if(HC_ACTION==nCode) UCTc$3  
 { 1$m{)Io2(  
  if((lParam&0xc0000000)==0xc0000000){// Key up 7 VYhRC-  
   switch(wParam) UvqnNA  
   { Zl]@;*u  
    case VK_MENU: YNp-A.o W@  
     MaskBits&=~ALTBIT; r.=.,R  
     break; eOZ~p  
    case VK_CONTROL: 8N<m V^|}  
     MaskBits&=~CTRLBIT; $!\L6;:  
     break; n+vv %  
    case VK_SHIFT: 5fmQ+2A C1  
     MaskBits&=~SHIFTBIT; ?PV@WrU>B  
     break; $8[JL \  
    default: //judge the key and send message "`a,/h'  
     break; )$*B  
   } vP%:\u:{  
   for(int index=0;index<MAX_KEY;index++){ #9qX:*>h   
    if(hCallWnd[index]==NULL) f&$$*a  
     continue; -7 Kstc-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) P4E_<v[  
    { l)EtK&er(}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4>N ig.#   
     bProcessed=TRUE; : ' pK  
    } W(.svJUgb.  
   } /}CAd  
  } *ck'vV'@  
  else if((lParam&0xc000ffff)==1){ //Key down XuU>.T$]c  
   switch(wParam) xa{.hp?  
   { lhBAT%U\  
    case VK_MENU: D>-Pv-f/  
     MaskBits|=ALTBIT; vrvi] Y8  
     break; a 5w E{K  
    case VK_CONTROL: kpQN>XV#  
     MaskBits|=CTRLBIT; dXU6TCjU7  
     break; ?]TtUoY=)F  
    case VK_SHIFT: r -uu`=,  
     MaskBits|=SHIFTBIT; D<*) ^^  
     break; Q7mikg=1-  
    default: //judge the key and send message ZA'0 q  
     break; -KqMSf&9  
   } hN!{/Gc|  
   for(int index=0;index<MAX_KEY;index++) ^j1G08W  
   { Gxt6]+r  
    if(hCallWnd[index]==NULL) !4YmaijeN  
     continue; X7MA>j3m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )2:U]d%pk  
    { 6/Z_r0^O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); IhK%.B{dZ  
     bProcessed=TRUE; "|PX5  
    } ~C?)- ]bF  
   } KHeeB`V>J  
  } Enp;-wG:-  
  if(!bProcessed){ 7--E$ !9O,  
   for(int index=0;index<MAX_KEY;index++){ +.*=Fn22  
    if(hCallWnd[index]==NULL) "!D,9AkZS  
     continue; =:H EF;!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `2q]ju  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); &m TYMpA  
   } $ ]^Io)}f@  
  } m\|EM'@k  
 } (Q.I DDlr  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); }|znQ3A2\l  
} l o- 42)  
j& L@L.d  
BOOL InitHotkey() ~O3VX75f  
{ SkU9iW(k  
 if(hHook!=NULL){ N#X* 0i"  
  nHookCount++; b$`/f:_  
  return TRUE; UcB2Aauji  
 } w+XwPpM0.n  
 else [ o 6  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); J@ 8OU  
  if(hHook!=NULL) g}*p(Tp9:  
   nHookCount++; pM*( kN  
  return (hHook!=NULL); iN5[x{^t  
} uME_/S uO  
BOOL UnInit() Z07n>|WF-  
{ LvL2[xh%&  
 if(nHookCount>1){ (:}}p}u  
  nHookCount--; X0LC:0+  
  return TRUE; Yv"B-oy  
 } NK%Ok  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ,lb}&uZo  
 if(unhooked==TRUE){ ]Z [0xs  
  nHookCount=0; !H6X%hlk  
  hHook=NULL; bj?=\u  
 } )X8N|W>vh  
 return unhooked; |jcIn[)=  
} a!;#u 8f  
gMU%.%p2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7(<r4{1?  
{ _k(&<1i  
 BOOL bAdded=FALSE; ]?Q<lMG  
 for(int index=0;index<MAX_KEY;index++){ >g{b'Xx  
  if(hCallWnd[index]==0){ /!*=*  
   hCallWnd[index]=hWnd; X*hPE=2` p  
   HotKey[index]=cKey; s Dsq:z  
   HotKeyMask[index]=cMask; d$n<^ ~Z  
   bAdded=TRUE; Z!l]v.S  
   KeyCount++; Nema>T]  
   break; G"Hj$  
  } n ON]YDg  
 } Cli:;yi&n  
 return bAdded; ##OCfCW  
} \\`(x:\  
akWOE}5#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Xv 7noq|  
{ }!m}?  
 BOOL bRemoved=FALSE; S{,|Fa^PPO  
 for(int index=0;index<MAX_KEY;index++){ 8K&=]:(  
  if(hCallWnd[index]==hWnd){ 9H+Q/Q*-a  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }|Bs|$q  
    hCallWnd[index]=NULL; :b;`.`@KL_  
    HotKey[index]=0; zqp>Xw  
    HotKeyMask[index]=0; ^^*Ia'9   
    bRemoved=TRUE; ZM [Z9/S8  
    KeyCount--; ciFqj3JS  
    break; 0(o.[% Ye  
   } h]j>S  
  } Fj"/jdM  
 } pfFHuS~  
 return bRemoved; |ZOdfr4uW  
} ;f)AM}~^Q  
(,cG+3r ]  
void VerifyWindow() C3(h j  
{ :Vw{ l B  
 for(int i=0;i<MAX_KEY;i++){ 9VSi2p*  
  if(hCallWnd!=NULL){ r^ABu_u(`I  
   if(!IsWindow(hCallWnd)){ 0: B%,n UM  
    hCallWnd=NULL; Sar1NkD#  
    HotKey=0; .=9d3uWJ/  
    HotKeyMask=0; 4`") aM  
    KeyCount--; S,vdd7Y  
   } r Cb#E}  
  } (D{J|  
 } {P )O#  
} rU 1Ri  
/NxuNi;5  
BOOL CHookApp::InitInstance() "|V}[ 2  
{ 8O[l[5u&  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); aS~~*UHW  
 hins=AfxGetInstanceHandle(); [* @ +  
 InitHotkey(); eDvh3Y<D  
 return CWinApp::InitInstance(); `oM'H+  
} Z_[L5B]Gwd  
!-ZY_  
int CHookApp::ExitInstance() 1X9J[5|ll  
{ |f(*R_R  
 VerifyWindow(); [\  &2&  
 UnInit(); lR]FQnZ  
 return CWinApp::ExitInstance(); @|e we. r  
} kU.@HJ[@j  
=T1Xfib  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ,T;D33XV  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) *eI{g  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 4 =T_h`  
#if _MSC_VER > 1000 8]rObT9>  
#pragma once RF~G{wz  
#endif // _MSC_VER > 1000 k(_OhV_  
DhD##5a  
class CCaptureDlg : public CDialog 08! _B\  
{ ):y^g:  
 // Construction V/zmbo)  
 public: *p9k> )'J  
  BOOL bTray; N7YCg  
  BOOL bRegistered; B![:fiR`  
  BOOL RegisterHotkey(); D|^N9lDaQ  
  UCHAR cKey; [a?bv7Kz  
  UCHAR cMask; A;o({9VH`Z  
  void DeleteIcon(); Ge^,hAM'  
  void AddIcon(); ^66OzT8A  
  UINT nCount; =YD<q:n4  
  void SaveBmp(); (!YJ:,!so  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor $aN%[  
  // Dialog Data aIh} j,  
  //{{AFX_DATA(CCaptureDlg) *B9xL[}  
  enum { IDD = IDD_CAPTURE_DIALOG }; GK[9IF#_>  
  CComboBox m_Key; }>V=J aG  
  BOOL m_bControl; w\{#nrhYU  
  BOOL m_bAlt; hTmJ ~m'J  
  BOOL m_bShift; .L]5,#2([  
  CString m_Path; #zBqj;p  
  CString m_Number; COmu.'%*  
  //}}AFX_DATA ^YB2E*  
  // ClassWizard generated virtual function overrides Kf_xKW)^  
  //{{AFX_VIRTUAL(CCaptureDlg) 7PBE(d%m  
 public: ~$hR:I1  
  virtual BOOL PreTranslateMessage(MSG* pMsg); .?LRt  
 protected: ,t:P  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ge7B%p8  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 1b2  
  //}}AFX_VIRTUAL =E^/gc%X  
  // Implementation I5`>XfO)  
 protected: E&5S[n9{3  
  HICON m_hIcon; o wb+,Gk(  
  // Generated message map functions WWo"De@  
  //{{AFX_MSG(CCaptureDlg) e,lLHg  
  virtual BOOL OnInitDialog(); *'\HG  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); L 4Z+8*  
  afx_msg void OnPaint(); {FS)f  
  afx_msg HCURSOR OnQueryDragIcon(); #;?/fZjY  
  virtual void OnCancel(); [x]~G  
  afx_msg void OnAbout(); Ih4$MG6QC  
  afx_msg void OnBrowse(); P"]l/  
  afx_msg void OnChange(); Ajo IL  
 //}}AFX_MSG oN%zpz;OR  
 DECLARE_MESSAGE_MAP() 6a_U[-a9;  
}; {<-wm-]mo  
#endif DiTpjk ]c`  
2)T;N`tNw  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file b?qV~Dg k`  
#include "stdafx.h" ] @#wR  
#include "Capture.h" o>bi~(H  
#include "CaptureDlg.h" q/d?c Lgl  
#include <windowsx.h>  :8==Bu  
#pragma comment(lib,"hook.lib") >yHtGIHe-  
#ifdef _DEBUG 5SmJ'zFO  
#define new DEBUG_NEW *ZFF$0}  
#undef THIS_FILE iHK.hs;  
static char THIS_FILE[] = __FILE__; P#`M8k  
#endif z%iPk'^  
#define IDM_SHELL WM_USER+1 S8v?H|rm  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); p . P#S  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &m   GU  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; w5 ]lU  
class CAboutDlg : public CDialog %Lb cwh(9  
{ d|9]E&;,  
 public: c2fSpvz  
  CAboutDlg(); Z @ef2y;  
  // Dialog Data ;[[6[i  
  //{{AFX_DATA(CAboutDlg) #8ltV`  
  enum { IDD = IDD_ABOUTBOX }; jZ:/d!$S  
  //}}AFX_DATA $5&~gHc,  
  // ClassWizard generated virtual function overrides "* N#-=MJF  
  //{{AFX_VIRTUAL(CAboutDlg) b{{ H@LTW  
 protected: 5 6.JB BZZ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "Z;({a$v  
  //}}AFX_VIRTUAL -$I30.#  
  // Implementation <r`;$K  
 protected: X(rXRP#  
  //{{AFX_MSG(CAboutDlg) PAtv#)h  
  //}}AFX_MSG 9F?-zn;2s  
  DECLARE_MESSAGE_MAP() CQ^(/B^c  
}; <t*<SdAq>`  
Vsw:&$  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) d_0(;'  
{ ZbjUOlE02  
 //{{AFX_DATA_INIT(CAboutDlg) ,J-|.ER->  
 //}}AFX_DATA_INIT p]/[ji  
} r|jM;  
$!y^t$u$@  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) J YA>Q&  
{ hvNK"^\p  
 CDialog::DoDataExchange(pDX); (2M00J-o  
 //{{AFX_DATA_MAP(CAboutDlg) ^cSfkBh  
 //}}AFX_DATA_MAP }#%Y eCA?  
} -!O8V  
O>a1S*mxP  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) \_6  
 //{{AFX_MSG_MAP(CAboutDlg) aR('u:@jHi  
 // No message handlers (_CvN=A  
 //}}AFX_MSG_MAP A'b$X1h  
END_MESSAGE_MAP() 8"g+ k`PRy  
MSeg7/MF  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) =T&<z_L  
: CDialog(CCaptureDlg::IDD, pParent) e84%Y8,0  
{ 0GeL">v,:=  
 //{{AFX_DATA_INIT(CCaptureDlg) \AA9 m'BZ  
  m_bControl = FALSE; fjl 9*  
  m_bAlt = FALSE; JX[]u<h?  
  m_bShift = FALSE; DI2e%`$  
  m_Path = _T("c:\\"); <eS/-W %n6  
  m_Number = _T("0 picture captured."); !Ko>   
  nCount=0; T]tu#h{ a  
  bRegistered=FALSE; w?^[*_Y  
  bTray=FALSE; VNIl%9:-l  
 //}}AFX_DATA_INIT Q^nf D  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 cfa1"u""e  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); F ]Zg  
} y Rl   
Bp5ra9*5+~  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 9+s&|XS*  
{ YM'4=BlJHv  
 CDialog::DoDataExchange(pDX); CI$z+ zN  
 //{{AFX_DATA_MAP(CCaptureDlg) 3oH/34jj  
  DDX_Control(pDX, IDC_KEY, m_Key); 9&.md,U'  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); C4.GtY8,d  
  DDX_Check(pDX, IDC_ALT, m_bAlt); K%mR=u#%&  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); n*na6rV\k  
  DDX_Text(pDX, IDC_PATH, m_Path); fDfph7[)  
  DDX_Text(pDX, IDC_NUMBER, m_Number); a`#lYM%(>  
 //}}AFX_DATA_MAP `XK\', }F  
} ujmIS~"  
j|K;Yi  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) r<!nU&FPD:  
//{{AFX_MSG_MAP(CCaptureDlg) a|oh Ad  
 ON_WM_SYSCOMMAND() Yk|.UuXT  
 ON_WM_PAINT() `67i1w`  
 ON_WM_QUERYDRAGICON() {z0iWY2Xw  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Ng*-Bw)p]  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) LD5`9-  
 ON_BN_CLICKED(ID_CHANGE, OnChange) |m"Gr)Gm  
//}}AFX_MSG_MAP j3/6hE>  
END_MESSAGE_MAP() REK):(i7P  
:DNI\TmhJ  
BOOL CCaptureDlg::OnInitDialog() 2y;vX|lX]  
{ hCr,6ncC  
 CDialog::OnInitDialog(); /_{ZWLi(  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); \gPMYMd  
 ASSERT(IDM_ABOUTBOX < 0xF000); Ry]9n.y  
 CMenu* pSysMenu = GetSystemMenu(FALSE); g0U?`;n$  
 if (pSysMenu != NULL) #G F.M,O/h  
 { 0 D '^:  
  CString strAboutMenu; _8 0L/92  
  strAboutMenu.LoadString(IDS_ABOUTBOX); bEQ-? X%7  
  if (!strAboutMenu.IsEmpty()) c!7WRHJE_a  
  { oe 6-F)+  
   pSysMenu->AppendMenu(MF_SEPARATOR); QkD ~  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 0!0e$!8l  
  } 7kE+9HmfMk  
 } S\A0gOL^  
 SetIcon(m_hIcon, TRUE); // Set big icon xRXvTNEg  
 SetIcon(m_hIcon, FALSE); // Set small icon m[3c,Axl7  
 m_Key.SetCurSel(0); 83/m^^F{]  
 RegisterHotkey(); d<Q%h?E  
 CMenu* pMenu=GetSystemMenu(FALSE); ]3f[v:JQ  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); &;P\e  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); u^{p' a'  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 7I"~a<f0X`  
 return TRUE; // return TRUE unless you set the focus to a control `pZX!6Wn  
} rM A%By^L-  
C`kqsK   
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ~//E'V-  
{ wLqj<ot  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Qr3!6  
 { 9cP{u$  
  CAboutDlg dlgAbout; Q*ELMib  
  dlgAbout.DoModal(); KhB775  
 } eUB!sR%  
 else "49dsKIOH  
 { {%9@{Q'T.s  
  CDialog::OnSysCommand(nID, lParam); UhS:tT]7  
 } $o5i15Oy.  
} l:UKU!  
0{bl^#$f  
void CCaptureDlg::OnPaint() 63Gq5dF  
{ +ynhN\S$/  
 if (IsIconic()) wyB]!4yy,  
 { * BR#^Wt  
  CPaintDC dc(this); // device context for painting %~Rg`+  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); FP=- jf/  
  // Center icon in client rectangle Er j{_i?R?  
  int cxIcon = GetSystemMetrics(SM_CXICON); _&V,yp!|  
  int cyIcon = GetSystemMetrics(SM_CYICON); FVrB#Hw~  
  CRect rect; nf"#F@dk  
  GetClientRect(&rect); v :/!OvLe  
  int x = (rect.Width() - cxIcon + 1) / 2; E\s1p: %  
  int y = (rect.Height() - cyIcon + 1) / 2; U{oM*[  
  // Draw the icon X5J)1rL  
  dc.DrawIcon(x, y, m_hIcon); w[gt9]}N  
 } ;iKtv+"  
 else fv8x7l7  
 { @XzfuuE]  
  CDialog::OnPaint(); k@|px#kq  
 } SQ2v  
} bRm;d_9zC  
lD[@D9  
HCURSOR CCaptureDlg::OnQueryDragIcon() @U5gxK*  
{ 9]IZ3 fQX  
 return (HCURSOR) m_hIcon; z!bT^_Cc0  
} |w*s:p  
Fd<Ouyxqe  
void CCaptureDlg::OnCancel() mL`8COA  
{ p$1 'e,G  
 if(bTray) "ufSHrZv  
  DeleteIcon(); Z@Q*An  
  CDialog::OnCancel(); LS<+V+o2%  
} k"DZ"JC  
~=OJCKv5(  
void CCaptureDlg::OnAbout() ]9w)0iH  
{ ,>6a)2xh  
 CAboutDlg dlg; &>+T*-'  
 dlg.DoModal(); m6BUKX\m  
} Ii[U%  
;u'VR}4ph  
void CCaptureDlg::OnBrowse() MW rhVn{R  
{ kGAgXtE  
 CString str; -%fj-Y7y  
 BROWSEINFO bi; )Wq1 af   
 char name[MAX_PATH]; ^il$t]X5-  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); :h34mNU  
 bi.hwndOwner=GetSafeHwnd(); ZOV,yuD{8{  
 bi.pszDisplayName=name; zi6J|u  
 bi.lpszTitle="Select folder"; 6z U  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; n8;L_43U  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); xk>cdgt  
 if(idl==NULL) dR\yRC]I  
  return; T]&?^QGAZ  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); eUN aq&M  
 str.ReleaseBuffer(); cK]n"6N[  
 m_Path=str; >KrI}>!9r  
 if(str.GetAt(str.GetLength()-1)!='\\') IW<rmP=R&  
  m_Path+="\\"; &M?b 08  
 UpdateData(FALSE); EEZ~Bs}d  
} h]&  
Qv ~@  
void CCaptureDlg::SaveBmp() -9{N7H  
{ /fT"WaTEK  
 CDC dc; M]{~T7n-  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); p!:oT1U  
 CBitmap bm; :~8@fEKb{  
 int Width=GetSystemMetrics(SM_CXSCREEN);  ]aF;  
 int Height=GetSystemMetrics(SM_CYSCREEN); >@ 8'C"F  
 bm.CreateCompatibleBitmap(&dc,Width,Height); _4Eq_w`  
 CDC tdc; COHBju fmR  
 tdc.CreateCompatibleDC(&dc); tUULpx.h  
 CBitmap*pOld=tdc.SelectObject(&bm); hizM}d-"C  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ?y>ji1  
 tdc.SelectObject(pOld); Q<V1`e  
 BITMAP btm; XTF[4#WO  
 bm.GetBitmap(&btm); RA<ky*^dr  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; WIi,`/K+  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); VZcW 3/Y  
 BITMAPINFOHEADER bih; >fP;H}S6  
 bih.biBitCount=btm.bmBitsPixel; +?"F=.SZ  
 bih.biClrImportant=0; KQ]sUNH  
 bih.biClrUsed=0; ZXb{-b?[`  
 bih.biCompression=0; s;oe Qa}TB  
 bih.biHeight=btm.bmHeight; hv#$Zo<  
 bih.biPlanes=1; fWEQ vQ  
 bih.biSize=sizeof(BITMAPINFOHEADER); M("sekL  
 bih.biSizeImage=size; zKJQel5  
 bih.biWidth=btm.bmWidth; <CO_JWD  
 bih.biXPelsPerMeter=0; l59\Lo:  
 bih.biYPelsPerMeter=0; Z9M$*Zp  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); NCi~. I  
 static int filecount=0; >&+V[srfD  
 CString name; LBD],Ba!  
 name.Format("pict%04d.bmp",filecount++); Jb*QlsGd  
 name=m_Path+name; qdpi-*2  
 BITMAPFILEHEADER bfh; 3)W_^6>bM  
 bfh.bfReserved1=bfh.bfReserved2=0; HJg&fkHn1  
 bfh.bfType=((WORD)('M'<< 8)|'B'); |^5"-3Q  
 bfh.bfSize=54+size; BrSvkce  
 bfh.bfOffBits=54; C=&n1/  
 CFile bf; NYHK>u/5c  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %b*N.v1+  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); kI(3Pf ].  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); /YZMP'v  
  bf.WriteHuge(lpData,size); ;[ Dxk$"  
  bf.Close(); %eofG]VM<  
  nCount++; /Lr`Aka5  
 } *)w+xWmM3w  
 GlobalFreePtr(lpData); %Jh( 5  
 if(nCount==1) e6_8f*o|s  
  m_Number.Format("%d picture captured.",nCount); R$l- 7YSt  
 else 7:LEf"vRZ  
  m_Number.Format("%d pictures captured.",nCount); xP>cQELot  
  UpdateData(FALSE); GNM>hQ)h:  
} w]qM  
.>TG{>sH  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Ua|iAD 1  
{ :X}SuM ?c  
 if(pMsg -> message == WM_KEYDOWN) S{l)hwlE  
 { Q.Nw#r+m  
  if(pMsg -> wParam == VK_ESCAPE) '/UT0{2;rS  
   return TRUE; UVl B=  
  if(pMsg -> wParam == VK_RETURN) ,h1\PT9ULY  
   return TRUE; ,_YI:xie|c  
 } (Ox&B+\v+v  
 return CDialog::PreTranslateMessage(pMsg); @:CM<+  
} cA 4?[F  
C@ q#s  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .F@Lx45  
{ en{p<]H  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ bs\k b-\R  
  SaveBmp(); bK#ZY  
  return FALSE; qgl-,3GY%N  
} 4t =Kt  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Pf4zjc  
 CMenu pop; '"7b;%EN'  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ^GM3nx$  
 CMenu*pMenu=pop.GetSubMenu(0); 3,v/zcV  
 pMenu->SetDefaultItem(ID_EXITICON); m4OnRZYlw  
 CPoint pt; N}VoO0I  
 GetCursorPos(&pt); 53aJnxX  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); k?Hi_;o  
 if(id==ID_EXITICON) LvS5N)[  
  DeleteIcon(); -6-rX D  
 else if(id==ID_EXIT) Ww8U{f  
  OnCancel(); )?radg  
 return FALSE; `_)9eGQ  
} wxK71OH  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); )vOBF5  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) %fS1g Sf h  
 AddIcon(); T2]8w1l&K  
 return res; .?g=mh79(  
} ku*k+4rz  
qk'&:A  
void CCaptureDlg::AddIcon() {ST8'hY  
{ ZMMx)}hS  
 NOTIFYICONDATA data; ec#`9w$  
 data.cbSize=sizeof(NOTIFYICONDATA);  gh[q*%#  
 CString tip; 3O*iv{-&  
 tip.LoadString(IDS_ICONTIP); :9 (kU  
 data.hIcon=GetIcon(0); 8iD7K@  
 data.hWnd=GetSafeHwnd(); i03S9J  
 strcpy(data.szTip,tip); 'MYKAnZ-i  
 data.uCallbackMessage=IDM_SHELL; lGp:rw`  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; {~51h}>b#  
 data.uID=98; L''VBY"?  
 Shell_NotifyIcon(NIM_ADD,&data); S6bYd`  
 ShowWindow(SW_HIDE); <HJLs+C  
 bTray=TRUE; ^pe/~ :a  
} 8d'/w}GV  
) C~#W  
void CCaptureDlg::DeleteIcon()  Rh6CV  
{ j8e=],sQ  
 NOTIFYICONDATA data; &/^p:I  
 data.cbSize=sizeof(NOTIFYICONDATA); & ;5f/  
 data.hWnd=GetSafeHwnd(); e^~dx}X  
 data.uID=98; 9.dZA9l@g  
 Shell_NotifyIcon(NIM_DELETE,&data); 2l V`UIa  
 ShowWindow(SW_SHOW); ,V]FAIJ  
 SetForegroundWindow(); z"7?I$N Q  
 ShowWindow(SW_SHOWNORMAL); T;Kv<G;  
 bTray=FALSE; J_&cI%.  
} vxPr)"Vvz  
tq}sedYhee  
void CCaptureDlg::OnChange() 6v:L8 t$"  
{ * wqR.n?  
 RegisterHotkey(); xG edY*[`  
} GBg  
 Iw?^  
BOOL CCaptureDlg::RegisterHotkey() d=+zOF  
{ YSB> WBS-<  
 UpdateData(); d <ES  
 UCHAR mask=0; /-lW$.+{?  
 UCHAR key=0; zBTxM  
 if(m_bControl) 3VMaD@nYa  
  mask|=4; _]'kw [  
 if(m_bAlt) U<XfO'XJ  
  mask|=2; GfP'  
 if(m_bShift) U"@p3$2QW  
  mask|=1; En-=z`j G  
  key=Key_Table[m_Key.GetCurSel()]; Y=sv   
 if(bRegistered){ F\;l)  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); T<nK/lp1t  
  bRegistered=FALSE; NA@Z$Gy  
 } kd&~_=Q  
 cMask=mask; #]i^L;u1A  
 cKey=key; jZ5ac=D&I  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); obbg# ,  
 return bRegistered; SI6?b1;-:F  
} m|?1HCRXRI  
V0,5c`H c  
  四、小结 {Gfsiz6  
8KR17i1  
  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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