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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: w71YA#cg  
  -E1-(TS  
  一、实现方法 .K84"Gdx  
lrZ]c:%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: G_?U?:!AC  
S?CT6moXA  
#pragma data_seg("shareddata") )!v"(i.5Xo  
HHOOK hHook =NULL; //钩子句柄 \dJhDR  
UINT nHookCount =0; //挂接的程序数目 T; tY7;<  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 N&   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 7;|"1H:cmw  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey :pM 8Q1:B  
static int KeyCount =0; JXL?.{'A  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 HnArj_E  
#pragma data_seg() Btxtu"]nJo  
|kK5:\H  
  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。 mt+i0PIfj  
e_e\Ie/pDc  
  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: .;g kV-]  
{ol7*%u  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Uj;JN}k  
cKey,UCHAR cMask) ="78#Wfj2  
{ $M)SsD~  
 BOOL bAdded=FALSE; W:8MqVm34  
 for(int index=0;index<MAX_KEY;index++){ )T"Aji-hy  
  if(hCallWnd[index]==0){ nQQHm6N  
   hCallWnd[index]=hWnd; .mfLHN%:  
   HotKey[index]=cKey; wxqX42v  
   HotKeyMask[index]=cMask; mDK*LL5]W  
   bAdded=TRUE; -&D=4,#  
   KeyCount++; K@*+;6y@  
   break; I'*,<BPG  
  } @Dfg6<0  
 } rX)&U4#[m  
 return bAdded; .O"a:^i  
} W+ ;=8S  
//删除热键 (=uT*Cb  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) C*ep8{B  
{ ewd eC  
 BOOL bRemoved=FALSE; mH\zSk  
 for(int index=0;index<MAX_KEY;index++){ i#>t<g`l  
  if(hCallWnd[index]==hWnd){ ^85Eveu  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Soq#cl'll-  
    hCallWnd[index]=NULL; n4!RGq.}  
    HotKey[index]=0; ]fzXrN_  
    HotKeyMask[index]=0; xh:I]('R  
    bRemoved=TRUE; keLeD1  
    KeyCount--; 1Sz tN3'q  
    break; }?,YE5~  
   } #M|lBYdW}  
  } o3`U;@&u  
 } p#jAEY p  
 return bRemoved; iS,l  
} 0F-{YQr>  
l#enbQ`-~  
peu9B gs  
  DLL中的钩子函数如下: />mK.FT  
"'bl)^+?,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) YA,~qT|  
{ lND2Kb  
 BOOL bProcessed=FALSE; OC*28)  
 if(HC_ACTION==nCode) IrQ.[?C  
 {  .x%w#  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 h_?`ESI~  
   switch(wParam) >I\B_q  
   {  Q&.uL}R  
    case VK_MENU: 0zNbux_  
     MaskBits&=~ALTBIT; @\w}p E  
     break; {)"[_<  
    case VK_CONTROL: V3ozaVk;  
     MaskBits&=~CTRLBIT; -B#1+rUW  
     break; : wS&3:h  
    case VK_SHIFT: NH|I>vyN  
     MaskBits&=~SHIFTBIT; _ cQ '3@  
     break; is8i_FoD,n  
    default: //judge the key and send message `{:Nt#7  
     break; Ht;Rz*}  
   } 5h/,*p6Nje  
   for(int index=0;index<MAX_KEY;index++){ OUUV8K  
    if(hCallWnd[index]==NULL) "jyo'r  
     continue; D<69xT,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _l9fNf!@  
    { |\Jnr3)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,:PMS8pS  
     bProcessed=TRUE; @ &N  
    } P6.PjK!Ar  
   } ldUZ\z(*  
  } v|(]u3=1_  
  else if((lParam&0xc000ffff)==1){ //有键按下 nQmHYOF%  
   switch(wParam) q~ a FV<Q  
   { nSyLt6zn\  
    case VK_MENU: +]cf/_8+s  
     MaskBits|=ALTBIT; } doAeTZ  
     break; 3GF67]  
    case VK_CONTROL: 2>9\o]ac4  
     MaskBits|=CTRLBIT; $x'jf?zs!  
     break; pL1ABvBB  
    case VK_SHIFT: Rb:H3zh  
     MaskBits|=SHIFTBIT; x3cjyu<K  
     break; r%f Q$q>  
    default: //judge the key and send message %]}JWXo f  
     break; ?pZU'5le`  
   } 5zBA]1PY  
   for(int index=0;index<MAX_KEY;index++){ GP c B(  
    if(hCallWnd[index]==NULL)  Kg';[G\  
     continue; l%2VA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Kj4BVs  
    { 7FoX)54"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Y:;_R=M  
     bProcessed=TRUE; 9SsVJ<9,R  
    } `{!A1xKZ  
   } Hi={(Z5tC4  
  } ]]:K l  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 `.J)Z=o  
   for(int index=0;index<MAX_KEY;index++){ ,5 ka{Q`K  
    if(hCallWnd[index]==NULL) ((A@VcX  
     continue; 0a89<yX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) "O>~osj  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); b5)^g+8)w  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 "b`#RohCi  
   } dh`s^D6Q>  
  } [T_[QU:A  
 } aeUgr !  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6d]4 %QT  
} HSNj  
;S U<T^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: ?h4[yp=w  
%cn 1d>M+I  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6"G(Iq'2t3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "L]v:lg3  
]Ik~TW&  
  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: ]7_>l>  
M}o.= Iqa  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) zNX=V!$  
{ #a=]h}&1?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) *,G< X^  
 { [Ix6ArY  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 s U`#hL6;  
  SaveBmp(); .5; JnJI  
  return FALSE; 8J'5%$3u  
 } =? !FO'zt"  
 …… //其它处理及默认处理 (E0WZ $f}  
} k_}$d{X  
$V 3If  
<lFHmi$qt{  
  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。 esTL3 l{[  
t#P7'9Se8  
  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。 |.Vgk8oTl  
{2q"9Ox"  
  二、编程步骤 [!%5(Ro_  
t`Bk2Cc)+  
  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"; }Q: CZ  
wqDf\k}'v  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; VQ('ejv}/  
L;:PeYPL  
  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; k?7"r4Vc)S  
EwzcB\m  
  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; 3\Xk)a_  
}Y7P2W+4?  
  5、 添加代码,编译运行程序。 _qPKdGoM  
h!dij^bD  
三、程序代码 ]mtiIu[  
~s&r.6 DW  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL t+A*Ws*o  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ^ulgZ2BQ|  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ $Mg O)bH  
#if _MSC_VER > 1000 MRz f#o<H  
#pragma once I@m(}  
#endif // _MSC_VER > 1000 Wy-_}wqHg  
#ifndef __AFXWIN_H__ AAfU]4u0S  
#error include 'stdafx.h' before including this file for PCH &w^9#L  
#endif ^!^M Gzu  
#include "resource.h" // main symbols -sv%A7i  
class CHookApp : public CWinApp r jn:E  
{ Caj H;K\  
 public: >uZc#Zt  
  CHookApp(); k 76<CX  
  // Overrides CP9Q|'oJ  
  // ClassWizard generated virtual function overrides u^SInanw  
  //{{AFX_VIRTUAL(CHookApp) C1f$^N  
 public: W3/] 2"0  
  virtual BOOL InitInstance(); ]+,L/P  
  virtual int ExitInstance(); U0 -RG  
  //}}AFX_VIRTUAL . h)VR 5?j  
  //{{AFX_MSG(CHookApp) mQVlE__ub  
  // NOTE - the ClassWizard will add and remove member functions here. jjH2!R]^>  
  // DO NOT EDIT what you see in these blocks of generated code ! O+mEE>:w%  
  //}}AFX_MSG / :.I&^>P  
  DECLARE_MESSAGE_MAP() ;rL>{UhG  
}; c86?-u')  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); }f;TG:6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /Zs_G=\>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p}==aNZK  
BOOL InitHotkey(); "a;$uW@.6  
BOOL UnInit(); O6$,J1 2l  
#endif S ^~"#   
j{FRD8]V  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 7)D[}UXz  
#include "stdafx.h" l$!ExXEZO;  
#include "hook.h" V"8Go;[  
#include <windowsx.h> fCu;n%   
#ifdef _DEBUG T0fm6 J  
#define new DEBUG_NEW Hj`'4  
#undef THIS_FILE ~h<T0Zc  
static char THIS_FILE[] = __FILE__; p/0dtnXa(  
#endif sE]z.Po=  
#define MAX_KEY 100 :KC]1_zqR  
#define CTRLBIT 0x04 x Y$x= )  
#define ALTBIT 0x02 mW)kWuOO  
#define SHIFTBIT 0x01 3BK 8{/  
#pragma data_seg("shareddata") >P(.yQ8&kL  
HHOOK hHook =NULL; /Cwwz  
UINT nHookCount =0; jHT^I as  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey _t]Q*i0p  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT z{BgAI,  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey r-S%gG}~E  
static int KeyCount =0; v" #8^q  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift XjzGtZ#6  
#pragma data_seg() g3'dkS!  
HINSTANCE hins; q@S \R 7R  
void VerifyWindow(); Vq#0MY)2gS  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) a"4X7 D+  
//{{AFX_MSG_MAP(CHookApp) 21<Sfsc$  
// NOTE - the ClassWizard will add and remove mapping macros here. C+!=C{@7di  
// DO NOT EDIT what you see in these blocks of generated code! Y[b08{/  
//}}AFX_MSG_MAP xv>8rW(Np5  
END_MESSAGE_MAP() 9`qw,X&AK_  
WllQM,h  
CHookApp::CHookApp() p:tp |/  
{ 9:%')M&Q  
 // TODO: add construction code here, i\ 7JQZ  
 // Place all significant initialization in InitInstance cfBl HeYE  
} %t* 9sh  
JI-.SR  
CHookApp theApp; AWFq5YMSI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) I^LU*A=  
{ |R91|-H  
 BOOL bProcessed=FALSE; vfT @;`  
 if(HC_ACTION==nCode) iX2exJto  
 { KX\=wFbP)  
  if((lParam&0xc0000000)==0xc0000000){// Key up ErA*a3  
   switch(wParam) m_  wvi  
   { OP(om$xm  
    case VK_MENU: OJydt;a  
     MaskBits&=~ALTBIT; o6x8j z  
     break; &!:mL],  
    case VK_CONTROL: u9q#L.Ij  
     MaskBits&=~CTRLBIT; U7zd7 O  
     break; (@ BB @G  
    case VK_SHIFT: 4Af7x6a;  
     MaskBits&=~SHIFTBIT; DcRoW  
     break; b~ig$!N]  
    default: //judge the key and send message 6L~5qbQ  
     break;  S{XO3  
   } |'}r-}  
   for(int index=0;index<MAX_KEY;index++){ T|$tQgY^  
    if(hCallWnd[index]==NULL) l9%ckC*q  
     continue; b H5lLcdf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B|^=2 >8s  
    { P"Q6wdm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Wl&6T1A`"  
     bProcessed=TRUE; +sZY0(|K8  
    } FD~uUZTM  
   } ze8MFz'm  
  } 'g<FL`iP  
  else if((lParam&0xc000ffff)==1){ //Key down @Z""|H"0  
   switch(wParam) g( "[wqgG  
   { b,ZBol|X  
    case VK_MENU: jX$U)O  
     MaskBits|=ALTBIT; lUnC+w#[  
     break; yJ; ;&  
    case VK_CONTROL: #K-O<:s=y  
     MaskBits|=CTRLBIT; {vd +cE  
     break; h|z59h&X8G  
    case VK_SHIFT: 2xy{g&G  
     MaskBits|=SHIFTBIT; G!F_Q7|-  
     break; K.?S,qg  
    default: //judge the key and send message %gqu7}'  
     break; A$zC$9{0I  
   } ?56;<%0  
   for(int index=0;index<MAX_KEY;index++) PEtr8J$uB  
   { 5}9rpN{y  
    if(hCallWnd[index]==NULL) <pT1p4T<  
     continue; Y!u">M#@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Cw.DLg  
    { }p9#Bzc  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ZD?LsD3  
     bProcessed=TRUE; n#P?JyGm1g  
    } TuwSJS7  
   } ZQ\O| n8  
  } 5Yk|  
  if(!bProcessed){  GXTjK!  
   for(int index=0;index<MAX_KEY;index++){ @-1VN;N  
    if(hCallWnd[index]==NULL) #zn`)n  
     continue; nl-tJ.MU"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) L6=5]?B=  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <HW2W"Go\  
   } 8f&#WIZ  
  } uF*tlaV6  
 } %yVP@M  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); VRv.H8^{  
} t<p4H^  
|' kC9H[>  
BOOL InitHotkey() DT]3q4__Q  
{ ,{RWs^W2  
 if(hHook!=NULL){ %LL?'&&  
  nHookCount++; I'R|B\  
  return TRUE; :WSszak  
 } $4CsiZ6  
 else *U,W4>(B  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); cbx( L8  
  if(hHook!=NULL) 1[?xf4EMG  
   nHookCount++; bFIv}c+;  
  return (hHook!=NULL); <5c^DA  
} M1Th~W9l  
BOOL UnInit() {`% q0Nr  
{ u&Xn#f h  
 if(nHookCount>1){ ^12}#I  
  nHookCount--; +\B.3%\-  
  return TRUE; +227SPLd  
 } !?{%9  
 BOOL unhooked = UnhookWindowsHookEx(hHook); AT^MQvn  
 if(unhooked==TRUE){ kqS_2[=]  
  nHookCount=0; TGG-rA6@Lx  
  hHook=NULL; ueJ_F#y  
 } N!af1zj  
 return unhooked; iS8yJRy  
} u,S}4p&l  
2C &l\16  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) o2riy'~  
{ 3q(]Dg;v  
 BOOL bAdded=FALSE; z 2Ao6*%  
 for(int index=0;index<MAX_KEY;index++){ /5 R?(-  
  if(hCallWnd[index]==0){ c~Z\|Y`#B  
   hCallWnd[index]=hWnd; IqjH  
   HotKey[index]=cKey; G]>P!]  
   HotKeyMask[index]=cMask; Jy#2 1  
   bAdded=TRUE; NK(; -~{P  
   KeyCount++; X&Pj  
   break; c6F8z75U  
  } &G!2T!xx  
 } b0Fr]oGp  
 return bAdded; + gP 4MP  
} BxXP]od  
7|7sA'1 cM  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) C@FX[:l@-  
{ E1rxuV|9  
 BOOL bRemoved=FALSE; .l]w4Hf  
 for(int index=0;index<MAX_KEY;index++){ G2_l}q~  
  if(hCallWnd[index]==hWnd){ (L8z<id<z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ O(44Dy@2  
    hCallWnd[index]=NULL; JclG*/Wjg4  
    HotKey[index]=0; zlN<yZB^  
    HotKeyMask[index]=0; 9y&&6r<I  
    bRemoved=TRUE; #-FfyxQ8ai  
    KeyCount--; E\=23[0  
    break; C'//(gjQ-G  
   } Vbpt?1:  
  } zF=E5TL-,4  
 } Ru^j~Cj5  
 return bRemoved; <-a6'g2y  
} -MH~1Tw6Z  
=5X(RGK  
void VerifyWindow() w}QU;rl8q  
{ -D30(g{O  
 for(int i=0;i<MAX_KEY;i++){ NYN(2J  
  if(hCallWnd!=NULL){ UkXf)  
   if(!IsWindow(hCallWnd)){ /M8&`  
    hCallWnd=NULL; ]$a,/Jt  
    HotKey=0; N[dv  
    HotKeyMask=0; b!-F!Lq/+0  
    KeyCount--; XnI)s^  
   } 095Z Z20  
  } >c 5V VA8  
 } J |TA12s  
} SXfAw)-n  
){{]3r  
BOOL CHookApp::InitInstance() Snf1vH  
{ sa>}wz<o  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ZU-vZD>  
 hins=AfxGetInstanceHandle(); N|L Ey  
 InitHotkey(); mg7Q~SLL{  
 return CWinApp::InitInstance(); 9-?[%8  
}  d365{  
)'gO?cN  
int CHookApp::ExitInstance() C'jE'B5b  
{ Qh. : N  
 VerifyWindow(); a6fqtkZ x  
 UnInit(); 00)=3@D  
 return CWinApp::ExitInstance(); _; ].  
} ^qlfdf  
|LNAd:0  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file j?rq%rQd  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ~%o?J"y  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ $Sfx0?'  
#if _MSC_VER > 1000 %4rPkPAtrp  
#pragma once (VzabO  
#endif // _MSC_VER > 1000 ROB/#Td  
89{@2TXR  
class CCaptureDlg : public CDialog _~b$6Nf!83  
{ ,| EaW& 2  
 // Construction "Gh?hU,WWZ  
 public: Tp0^dZM+  
  BOOL bTray; Pq:GvM`  
  BOOL bRegistered; *q.qO )X}3  
  BOOL RegisterHotkey(); ? 3 l4U  
  UCHAR cKey; tv1Z%Mx?Cp  
  UCHAR cMask; %SJ9Jr,  
  void DeleteIcon(); QjlwT2o'  
  void AddIcon(); qc-4;m o  
  UINT nCount; g[~"c}  
  void SaveBmp(); oAgO 3x   
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor f}1R,N_fC  
  // Dialog Data +u:Q+PkM  
  //{{AFX_DATA(CCaptureDlg) ,TAzJ  
  enum { IDD = IDD_CAPTURE_DIALOG }; |P"p/iY  
  CComboBox m_Key; ` E2@GX+,  
  BOOL m_bControl; i; 3^vhbQ  
  BOOL m_bAlt; 5-ju5z?=  
  BOOL m_bShift; c_xo6+:l  
  CString m_Path; 1$g]&'  
  CString m_Number; K;wd2/jmJ  
  //}}AFX_DATA ZzuEw   
  // ClassWizard generated virtual function overrides bQ" w%!  
  //{{AFX_VIRTUAL(CCaptureDlg) `/mcjKQ&9y  
 public: Ux Yb[Nbc  
  virtual BOOL PreTranslateMessage(MSG* pMsg); M)oy3y^&  
 protected: !?7c2QRN  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _bO4s#yI  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); IW.~I,!x  
  //}}AFX_VIRTUAL 0V&6"pF_Y'  
  // Implementation ]`2=<n;=  
 protected: 62 biOea  
  HICON m_hIcon; u-a*fT  
  // Generated message map functions n^Qt !~  
  //{{AFX_MSG(CCaptureDlg) :/kz*X=<  
  virtual BOOL OnInitDialog(); c?NXX&  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); zl W 5$cC[  
  afx_msg void OnPaint(); -nQ:RHnd  
  afx_msg HCURSOR OnQueryDragIcon(); d|9B3I*I  
  virtual void OnCancel(); Lit@ m2{\  
  afx_msg void OnAbout(); tDl1UX  
  afx_msg void OnBrowse(); 9(>l trA  
  afx_msg void OnChange(); S"Dw8_y7}  
 //}}AFX_MSG c bk|LQ.O  
 DECLARE_MESSAGE_MAP() ? D?XaRb  
}; D e>'  
#endif rN'')n/F  
_O-ZII~  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file uV:;q>XM'%  
#include "stdafx.h" xYJ|G=h&A  
#include "Capture.h" os]P6TFFX?  
#include "CaptureDlg.h" o1"MW>B,4  
#include <windowsx.h> i$Q$y hT{  
#pragma comment(lib,"hook.lib") 2U-F}Z  
#ifdef _DEBUG 1R1DK$^c  
#define new DEBUG_NEW Dwq}O  
#undef THIS_FILE RQZ|:SvV  
static char THIS_FILE[] = __FILE__; j zaC  
#endif V(%L}0[]  
#define IDM_SHELL WM_USER+1 v}v! hs Q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /\S1p3EW*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4&Uq\,nx  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; AiT&:'<UT  
class CAboutDlg : public CDialog l%?D%'afN  
{  p=Nord  
 public: ubn`w=w$  
  CAboutDlg(); >4A~?=  
  // Dialog Data ,1"w2,=  
  //{{AFX_DATA(CAboutDlg) '[ZRWwhr  
  enum { IDD = IDD_ABOUTBOX }; cC.=,n  
  //}}AFX_DATA ?G[<~J3-E  
  // ClassWizard generated virtual function overrides ydCVG,"  
  //{{AFX_VIRTUAL(CAboutDlg) NM0[yh  
 protected: 'Jb6CR n  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support MX%D %} N  
  //}}AFX_VIRTUAL o5(p&:1M  
  // Implementation Y!VYD_'P  
 protected: O'~c;vBI  
  //{{AFX_MSG(CAboutDlg) J Cu3,O!q  
  //}}AFX_MSG zW`$T 88~  
  DECLARE_MESSAGE_MAP() YEZd8Y  
}; >9o(84AxIH  
/qW5M4.w  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 17Q1Xa  
{ :>U2yI  
 //{{AFX_DATA_INIT(CAboutDlg) %z6.}4h  
 //}}AFX_DATA_INIT e>-a\g  
} fX,L;Se"  
6B)3SC  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) }E5oa\ 1u  
{ 2 0Xqs,  
 CDialog::DoDataExchange(pDX); h*_h M1*;  
 //{{AFX_DATA_MAP(CAboutDlg) c5K@<=?,E  
 //}}AFX_DATA_MAP =_%i5]89P  
} "p43#  
aI$D qnF4  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) l[EnFbD6  
 //{{AFX_MSG_MAP(CAboutDlg) =qY!<DB[L  
 // No message handlers P=:mn>  
 //}}AFX_MSG_MAP ?=:wIMV  
END_MESSAGE_MAP()  =#N;ZG  
"T/ vE  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 289@O-  
: CDialog(CCaptureDlg::IDD, pParent) jXEuK:exQ  
{ sp4J%2b  
 //{{AFX_DATA_INIT(CCaptureDlg) -e"~UDq`  
  m_bControl = FALSE; yub|   
  m_bAlt = FALSE; D|W^PR:@h  
  m_bShift = FALSE; oT7=  
  m_Path = _T("c:\\"); SbNs#  
  m_Number = _T("0 picture captured."); 6&o9mc\I  
  nCount=0; ?UC3ES  
  bRegistered=FALSE; _pSCv:3T  
  bTray=FALSE; =&QC&CqEi  
 //}}AFX_DATA_INIT L lmdydC%  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 gU7@}P  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^goa$ uxU  
} bWN%dn$$M  
,EyZ2`|  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ;P9P2&c8c  
{ h)[{{JSf  
 CDialog::DoDataExchange(pDX); =yv_i]9AN  
 //{{AFX_DATA_MAP(CCaptureDlg) s? /#8 `  
  DDX_Control(pDX, IDC_KEY, m_Key); =HT:p:S  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Ys@M1o  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ecK{+Z'G  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); bI)ItC_wf!  
  DDX_Text(pDX, IDC_PATH, m_Path); Wq_#46P-  
  DDX_Text(pDX, IDC_NUMBER, m_Number); S^,1N 4  
 //}}AFX_DATA_MAP I#0WN  
} W+3ZuAP\n  
, Vz 1l_7  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) MHN?ZHC)  
//{{AFX_MSG_MAP(CCaptureDlg) 74VN3m  
 ON_WM_SYSCOMMAND() 3[kY:5-  
 ON_WM_PAINT() KX e/i~AS  
 ON_WM_QUERYDRAGICON() c+PT"/3  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) <szD"p|K  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) nJJ9>#<g$  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Nf0'>`/  
//}}AFX_MSG_MAP 0GR\iw$[J  
END_MESSAGE_MAP() o9dqHm  
Z^i=51  
BOOL CCaptureDlg::OnInitDialog() 6Q<^,`/T  
{ Hl"qLrb4  
 CDialog::OnInitDialog(); Z:VqBqK  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); [KA&KI^hF  
 ASSERT(IDM_ABOUTBOX < 0xF000); 7 jq?zS|  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 5Xn+cw*  
 if (pSysMenu != NULL) 'p=5hsG  
 { @5n!t1(  
  CString strAboutMenu; Kq}/`P  
  strAboutMenu.LoadString(IDS_ABOUTBOX); %G6ml,  
  if (!strAboutMenu.IsEmpty()) %Z@+K_X9x  
  { /+\m7IS  
   pSysMenu->AppendMenu(MF_SEPARATOR); Ha l,%W~e  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); mQmn&:R  
  } ! 8q+W`{  
 } ~~[Sz#(  
 SetIcon(m_hIcon, TRUE); // Set big icon (Dr g  
 SetIcon(m_hIcon, FALSE); // Set small icon 7cx~?xk <m  
 m_Key.SetCurSel(0); "(y",!U@  
 RegisterHotkey(); -TKS`,#  
 CMenu* pMenu=GetSystemMenu(FALSE); 70p1&Y7or  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 8X=cGYC#  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); %{\|/#>:  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); k0IW,z%  
 return TRUE; // return TRUE unless you set the focus to a control (~F{c0 \C  
} fY@Y$S`Fh  
JzD Mx?  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) v.,|#}0 o  
{ >AsD6]  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) )Lht}I ]:  
 { I`"8}d@Jm  
  CAboutDlg dlgAbout; J+f .r|?  
  dlgAbout.DoModal(); n}9vAvC  
 } 6AeX$>k+  
 else -lHSojq~H  
 { RXa&*Jtr -  
  CDialog::OnSysCommand(nID, lParam); ]]lgCac_U9  
 } (4_7ICFI  
} )3<|<jwcx  
EL!V\J`S_  
void CCaptureDlg::OnPaint() 4`lt 4L  
{ V{17iRflf  
 if (IsIconic()) 8<(qN> R  
 { 1PWs">*(  
  CPaintDC dc(this); // device context for painting Bw-<xwD  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); T'9I&h%\  
  // Center icon in client rectangle yX%T-/XJ  
  int cxIcon = GetSystemMetrics(SM_CXICON); .<zW(PW  
  int cyIcon = GetSystemMetrics(SM_CYICON); KK; 3<kX  
  CRect rect; y6.}h9~  
  GetClientRect(&rect); K;jV"R<9  
  int x = (rect.Width() - cxIcon + 1) / 2; WF0%zxg]  
  int y = (rect.Height() - cyIcon + 1) / 2; ,Y&LlB 2  
  // Draw the icon /(C?3 }}L  
  dc.DrawIcon(x, y, m_hIcon); mm-!UsT  
 } 9"Vch;U$  
 else O9OD[VZk  
 { DSGtt/n  
  CDialog::OnPaint(); K*;e>{p  
 } hn9'M!*:O  
} 9"mOjL  
68ce+|  
HCURSOR CCaptureDlg::OnQueryDragIcon() mG4myQ?$  
{ XMb]&VvH  
 return (HCURSOR) m_hIcon; ( ON n{12Q  
} 4Q2=\-KFj  
P7GuFn/p~2  
void CCaptureDlg::OnCancel() zbHNj(~  
{ q) %F#g  
 if(bTray) "Y(stRa  
  DeleteIcon(); :V1ttRW}52  
  CDialog::OnCancel(); ^VsX9  
} 6?y<F4  
qzk/P1{-  
void CCaptureDlg::OnAbout() A4RA5N/}  
{ M@$}Og  
 CAboutDlg dlg; 5WN^8`{'3  
 dlg.DoModal(); \l^L?69  
} :^7P. lhK  
e?W-vi%  
void CCaptureDlg::OnBrowse() '<N^u@tF7  
{ OO?d[7Wt0  
 CString str; $hexJzX  
 BROWSEINFO bi; ~B!O X  
 char name[MAX_PATH]; 9kmEg$WM  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); b-pZrnZ!  
 bi.hwndOwner=GetSafeHwnd(); JCoDe.  
 bi.pszDisplayName=name; M B]8iy8  
 bi.lpszTitle="Select folder"; IS *-MLi  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; R`}C/'Ty  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); [JAHPy=+w  
 if(idl==NULL) >TSPEvWc  
  return; E6"+\-e  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Vfkm{*t)  
 str.ReleaseBuffer(); D$C>ZF  
 m_Path=str; kTQ.7mo/\'  
 if(str.GetAt(str.GetLength()-1)!='\\')  lJaR,,  
  m_Path+="\\"; 4.7 YIM  
 UpdateData(FALSE); &L3OP@;  
} zrt\] h+  
2$=U#!OtU  
void CCaptureDlg::SaveBmp() \Fd6Q_  
{ NfG<!  
 CDC dc; B/"TaXVU  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); YbaaX{7^  
 CBitmap bm; V<X[>C'  
 int Width=GetSystemMetrics(SM_CXSCREEN); l-;u*JA  
 int Height=GetSystemMetrics(SM_CYSCREEN); -$W#bqvz^  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Co|3k:I 8  
 CDC tdc; Hh^EMQk  
 tdc.CreateCompatibleDC(&dc); =MQpYX  
 CBitmap*pOld=tdc.SelectObject(&bm); j\W"P_dpd  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); e/+_tC$@p@  
 tdc.SelectObject(pOld); 3khsGD@  
 BITMAP btm; l&rS\TCkp  
 bm.GetBitmap(&btm); pq8XCOllXx  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ;U7o)A;  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 9a\H+Y~  
 BITMAPINFOHEADER bih; Ziclw)   
 bih.biBitCount=btm.bmBitsPixel; tC;L A 4  
 bih.biClrImportant=0; O~3<P3W  
 bih.biClrUsed=0; <sU?q<MC  
 bih.biCompression=0; BE,XiH;  
 bih.biHeight=btm.bmHeight; ?`9XFE~a!  
 bih.biPlanes=1; Y"Y%JJ.J  
 bih.biSize=sizeof(BITMAPINFOHEADER); xBba&A]=  
 bih.biSizeImage=size; [k1N-';;;  
 bih.biWidth=btm.bmWidth; @VdkmqXz  
 bih.biXPelsPerMeter=0; NifD pqjgt  
 bih.biYPelsPerMeter=0; ?D 8<}~Do  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); EPEy60Rx5  
 static int filecount=0; Fjnp0:p9X  
 CString name; ;<=Z\NX  
 name.Format("pict%04d.bmp",filecount++); R/!lDv!  
 name=m_Path+name; g]kM7,/M  
 BITMAPFILEHEADER bfh; e6?iQ0  
 bfh.bfReserved1=bfh.bfReserved2=0; K1`Z}k_p.  
 bfh.bfType=((WORD)('M'<< 8)|'B'); -PfBL8  
 bfh.bfSize=54+size; 54[#&T$S  
 bfh.bfOffBits=54; z1dSZ0NoA  
 CFile bf; e}@VR<h  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ pe}mA}9U  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); G =`-w  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); k2bjBAT  
  bf.WriteHuge(lpData,size); O|Sbe%[*wW  
  bf.Close(); KGM9 b  
  nCount++; VT>TmfN(I  
 } _*&I[%I5  
 GlobalFreePtr(lpData); &,v- AL$:Q  
 if(nCount==1) E6 g]EE  
  m_Number.Format("%d picture captured.",nCount); o!6~tO=%  
 else m1pge4*  
  m_Number.Format("%d pictures captured.",nCount); )FLDCer  
  UpdateData(FALSE); PjwDth A1  
} r4YiXss  
&Hz{   
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) n*gr(S  
{ RIC\f_Dv  
 if(pMsg -> message == WM_KEYDOWN) 6XP>qI,AJ  
 { "0*yD[2  
  if(pMsg -> wParam == VK_ESCAPE) w!/\dqjv  
   return TRUE; ^$FNu~|K  
  if(pMsg -> wParam == VK_RETURN) I |PEC-(  
   return TRUE; vR"?XqgZ  
 } $7bLw)7  
 return CDialog::PreTranslateMessage(pMsg); W D/\f$4  
} 7pllzy  
<K g=?wb  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <v=$A]K  
{ )2z<5 `  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ L/J1;  
  SaveBmp(); }l>\D~:M  
  return FALSE; lpq) vKM}^  
} `Wl_yC_*G;  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ m&PfZ%'[  
 CMenu pop; Ob~7w[n3  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ]QU 9|1  
 CMenu*pMenu=pop.GetSubMenu(0); saRYd{%+  
 pMenu->SetDefaultItem(ID_EXITICON); f 7R/i  
 CPoint pt; r|MBkpcvp  
 GetCursorPos(&pt); 1'NJ[ C`  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); }}Zwdpo  
 if(id==ID_EXITICON) |?cL>]t  
  DeleteIcon(); =l)D$l  
 else if(id==ID_EXIT) 3# g"Z7/  
  OnCancel(); @:dn\{Zsea  
 return FALSE; k!Ym<RD%N  
} c;X%Ar  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); X!b+Dk  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 0dTHF})m  
 AddIcon(); #ORZk6e  
 return res; IdS=lN$  
} 'iM#iA8  
"L0Q"t:  
void CCaptureDlg::AddIcon() 8t;vZ&  
{ _ez*dE%  
 NOTIFYICONDATA data; @Ojbu@A  
 data.cbSize=sizeof(NOTIFYICONDATA); t!8(IR  
 CString tip; +TZVx(Z&A  
 tip.LoadString(IDS_ICONTIP); ~|lEi1|  
 data.hIcon=GetIcon(0); oW5Ov  
 data.hWnd=GetSafeHwnd(); 70GwTK.{~  
 strcpy(data.szTip,tip); =.`:jZG  
 data.uCallbackMessage=IDM_SHELL; |Q(3rcOrV"  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; pqCp>BO?O  
 data.uID=98; xA'RO-a}h  
 Shell_NotifyIcon(NIM_ADD,&data); dEhFuNO<2  
 ShowWindow(SW_HIDE); Zt"#'1  
 bTray=TRUE; :hBLi99 o  
} M=M~M$K  
qEvbKy}  
void CCaptureDlg::DeleteIcon() 'uW&AD p  
{ w t6&N{@  
 NOTIFYICONDATA data; [t6Y,yo&h4  
 data.cbSize=sizeof(NOTIFYICONDATA); */APe #  
 data.hWnd=GetSafeHwnd(); N79?s)l:K  
 data.uID=98; HdR TdV  
 Shell_NotifyIcon(NIM_DELETE,&data); OcE,E6LD  
 ShowWindow(SW_SHOW); e#AmtheZR  
 SetForegroundWindow(); XxYwBc'pc  
 ShowWindow(SW_SHOWNORMAL); hAV@/oQ  
 bTray=FALSE; *`_ 2uBz  
} BM o2t'L  
:anR/  
void CCaptureDlg::OnChange() $qR<_6j  
{ p[K!.vOt+  
 RegisterHotkey(); tZ.hSDH  
} =E$B0^_2RC  
NY GWA4L  
BOOL CCaptureDlg::RegisterHotkey() m;JB=MZ=m  
{ v@d]*TG  
 UpdateData(); <^w4+5sT/  
 UCHAR mask=0; aH&Efz^  
 UCHAR key=0; RhWW61!"  
 if(m_bControl) g5;Ig  
  mask|=4; nh]HEG0CZJ  
 if(m_bAlt) eMLcm ZJR  
  mask|=2; &X6hOc:``\  
 if(m_bShift) cX#U_U~d  
  mask|=1; #Ibpf ,  
  key=Key_Table[m_Key.GetCurSel()]; Gn%"B6  
 if(bRegistered){ (]nX:t  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); =`k', V_  
  bRegistered=FALSE; {pXqw'"1.  
 } >x1yFwX}-f  
 cMask=mask; :CsrcT=  
 cKey=key; 6IJH%qUx'  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ]P96-x  
 return bRegistered; wu.>'v?y  
} z+K1[1SM  
\iA.{,VX  
  四、小结 9DmFa5E  
F@b=S0}K  
  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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