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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: s{:Thgv,9  
  Ie}7#>S  
  一、实现方法 `0`#Uf_/$  
F8xu&Vk0:  
  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: e8&7W3 m  
bQ-n<Lx  
#pragma data_seg("shareddata") Z~K} @  
HHOOK hHook =NULL; //钩子句柄 w>4( hGO  
UINT nHookCount =0; //挂接的程序数目 ^ f[^.k$3d  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 y/>Nx7C0=2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 BKK@_B"  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey mGo NT  
static int KeyCount =0; I9h{fB  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 qOAhBZ~  
#pragma data_seg() #V.u[:mO  
XEUS)X)  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 t!59upbN}3  
.Ms$)1  
  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: R@KWiV  
w{riXOjS4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR k- exqM2x=  
cKey,UCHAR cMask) c_u7O \  
{ =N2@H5+7  
 BOOL bAdded=FALSE; qE.3:bQ!`  
 for(int index=0;index<MAX_KEY;index++){ S`& yVzv  
  if(hCallWnd[index]==0){ k>=wwPy  
   hCallWnd[index]=hWnd; >:OP+Vc  
   HotKey[index]=cKey; AMN`bgxW  
   HotKeyMask[index]=cMask; _ucixM#  
   bAdded=TRUE; ^97[(89G9  
   KeyCount++; Ky*xAx:  
   break; [$M l;K  
  } Yc5<Y-W  
 } Pk5 %lu  
 return bAdded; 4'.] -u  
} ]d*O>Pm  
//删除热键 p  ~)\!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [6?x 6_M  
{ EcPvE=^c  
 BOOL bRemoved=FALSE; +&* >FeJY  
 for(int index=0;index<MAX_KEY;index++){ a YY1*^  
  if(hCallWnd[index]==hWnd){ u4xJ-Vu  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ lUiO|  
    hCallWnd[index]=NULL; `FK qVd  
    HotKey[index]=0; eGUe#(I /  
    HotKeyMask[index]=0; 'cY @Dqg1  
    bRemoved=TRUE; 9y*(SDF  
    KeyCount--; +A%zFF3  
    break; *7qa]i^]  
   } )O\l3h"  
  } n65fT+;  
 } JEfhr  
 return bRemoved; _+gpdQq\p  
} ZJQkZ_9@2  
crJNTEz  
:(I=z6  
  DLL中的钩子函数如下: NJKk\RM@7  
akQb%Wq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) V3_qqz}`r  
{ oTA'=<W?D  
 BOOL bProcessed=FALSE; lEpPi@2PK  
 if(HC_ACTION==nCode) 17 VNw/Y  
 { 0.#% KfQ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 z u1gP/  
   switch(wParam) !9^GkFR6n  
   {  +EZr@  
    case VK_MENU: we?t/YB=  
     MaskBits&=~ALTBIT; QzYaxNGv  
     break; JV! }"[  
    case VK_CONTROL: r<*Y1;7H'  
     MaskBits&=~CTRLBIT; UHDcheeRD  
     break; +PO& z!F  
    case VK_SHIFT: tOPk x(  
     MaskBits&=~SHIFTBIT; d%Ku 'Jy  
     break; :$QwOz^N*  
    default: //judge the key and send message CF5%&B  
     break; N]|U-fN\  
   } ~5Rh7   
   for(int index=0;index<MAX_KEY;index++){ 7RgnL<t~:8  
    if(hCallWnd[index]==NULL) P2)g%$ME  
     continue; UL" <V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tdC kvVE  
    { 1'5 !")r  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); * =O@D2g0  
     bProcessed=TRUE; gKb5W094@  
    } *oIKddZh  
   } OmP(&t7  
  } B^hK  
  else if((lParam&0xc000ffff)==1){ //有键按下 7p18;Z+6>X  
   switch(wParam) *kDV ^RBfq  
   { Q1 vse  
    case VK_MENU: 6:\z8fYD  
     MaskBits|=ALTBIT; [92bGR{  
     break; FRTvo  
    case VK_CONTROL: !v3wl0  
     MaskBits|=CTRLBIT; 4W+nS v  
     break; 9a.[>4}  
    case VK_SHIFT: td+[Na0d  
     MaskBits|=SHIFTBIT; 1z[blNs&  
     break; tQ4{:WPG  
    default: //judge the key and send message y] ~X{v  
     break; xX])IZ D  
   } i4 tW8 Il  
   for(int index=0;index<MAX_KEY;index++){ 5?|PC.  
    if(hCallWnd[index]==NULL) .T*7nw  
     continue; $w<~W1\:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }Z\+Qc<<  
    { UmQ'=@^kR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ZP%Bu2xd  
     bProcessed=TRUE; NO)vk+   
    } fGLOXbsA  
   } .{ ]=v  
  } [g*]u3s  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 u"a$/  
   for(int index=0;index<MAX_KEY;index++){ ;D<rGkry  
    if(hCallWnd[index]==NULL) ,<-a 6  
     continue; &nZ.$UK<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) j8p'B-yS  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ?r~](l   
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ]9pcDZB  
   } k4nA+k<WI`  
  } #kGxX@0  
 } 8%9OB5?F6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %K]nX#.B&  
} 0b}lwo,|\  
+<I1@C  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: O~&l.>??  
k)USLA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); r,dxW5v.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^A$~8?f  
^SRa!8z$W  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 1vxh3KS.  
(.3L'+F  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  ?hpk)Qu  
{ R:JS)>B  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ( ]o6Pi  
 { iJE|u  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 'C*NyHc  
  SaveBmp(); -/&6}lD  
  return FALSE; VVje|T^{Z  
 } }fs;yPl,  
 …… //其它处理及默认处理 )+9D$m=P;  
} egi?Qg  
G8?<(.pi@  
W.,J'  
  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。 efP2 C\  
am05>c9  
  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。 `\P:rn95;  
Y<.F/iaH  
  二、编程步骤 D2Go,1  
p:ST$ 1 K  
  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"; P-`^I`r  
osX23T~-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; YKvFZH)  
I_ .;nU1xA  
  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; A1f]HT  
+CNRSq"  
  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; I.e'  
a^5`fA/L,  
  5、 添加代码,编译运行程序。 E(U}$Zey  
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三、程序代码 qkUr5^1  
@+X}O /74  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL r5iO%JFg  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) @#H{nj Z  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 0I?3@Nz6  
#if _MSC_VER > 1000 a\m10Ih:  
#pragma once mLY*  
#endif // _MSC_VER > 1000 <CmsnX  
#ifndef __AFXWIN_H__ .Um%6a-  
#error include 'stdafx.h' before including this file for PCH 1I^Sv  
#endif ;+b}@e  
#include "resource.h" // main symbols ]:E]5&VwV}  
class CHookApp : public CWinApp '\*Rw]bR|  
{ r rwsj`  
 public: TcfBfscU  
  CHookApp(); Jp-ae0 Ewa  
  // Overrides X)f"`$  
  // ClassWizard generated virtual function overrides |f?C*t',  
  //{{AFX_VIRTUAL(CHookApp) *u{.K:.I  
 public: 1v\-jM"  
  virtual BOOL InitInstance(); M9OFK\)  
  virtual int ExitInstance(); T*T.\b  
  //}}AFX_VIRTUAL Z%OSW  
  //{{AFX_MSG(CHookApp) >;3c; nf  
  // NOTE - the ClassWizard will add and remove member functions here. 4QZy-a*tA  
  // DO NOT EDIT what you see in these blocks of generated code ! Z|?XQ-R5  
  //}}AFX_MSG \+AH>I;vO  
  DECLARE_MESSAGE_MAP() 5PL,~Y  
}; n ~3c<{coZ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); t+(CAP|,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I3 x}F$^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %<muVRkB\  
BOOL InitHotkey(); GyPN)!X@.&  
BOOL UnInit(); :A{-^qd(  
#endif !yI)3;$*  
TQ2Tt "  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 8c|IGC  
#include "stdafx.h" \4p<;$'  
#include "hook.h" M{4_BQ4$  
#include <windowsx.h> +Ae.>%}  
#ifdef _DEBUG >SGSn/AJi  
#define new DEBUG_NEW er#=xqUY  
#undef THIS_FILE X0$_KPn  
static char THIS_FILE[] = __FILE__; Go67VqJr  
#endif L wu;y@[  
#define MAX_KEY 100 Q8~pIv  
#define CTRLBIT 0x04 4#YklVm  
#define ALTBIT 0x02 2$ rq  
#define SHIFTBIT 0x01 d?P aZz{4  
#pragma data_seg("shareddata") 0Yjy  
HHOOK hHook =NULL; &4[iC/}  
UINT nHookCount =0; 1<p"z,c  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey E>1USKxn  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT UK<"|2^sT  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ]\ezES  
static int KeyCount =0; 3U`.:w`  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift `3:%F>  
#pragma data_seg() k1H0hDE  
HINSTANCE hins; C/Z"W@7#;  
void VerifyWindow(); TatyD**(  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) }00e@a  
//{{AFX_MSG_MAP(CHookApp) a wK'XFk  
// NOTE - the ClassWizard will add and remove mapping macros here. [Bh]\I'  
// DO NOT EDIT what you see in these blocks of generated code! Ja&%J:  
//}}AFX_MSG_MAP NE4fQi?3  
END_MESSAGE_MAP() W*m[t&;  
\nyFN  
CHookApp::CHookApp() N9ufTlq s  
{ ~z}au"k  
 // TODO: add construction code here, !T{g& f  
 // Place all significant initialization in InitInstance Z%R%D*f@y  
} <<1oc{i  
=KZ4:d5  
CHookApp theApp; Vel;t<1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) u@E M,o  
{ {EUH#':  
 BOOL bProcessed=FALSE; IXN4?=)I  
 if(HC_ACTION==nCode) M5V1j(URE  
 { g3XAs@  
  if((lParam&0xc0000000)==0xc0000000){// Key up A!kyga6F5  
   switch(wParam) Mt Z(\&~  
   { QBy*y $  
    case VK_MENU: D=>^m=?0  
     MaskBits&=~ALTBIT; +;Gl>$  
     break; ~e+w@ lK  
    case VK_CONTROL: Q=8 cBRe  
     MaskBits&=~CTRLBIT; u3:Qt2^S  
     break; iFA"m;$  
    case VK_SHIFT: *La =7y:  
     MaskBits&=~SHIFTBIT; M::iU_  
     break; #0D.37R+k  
    default: //judge the key and send message |7$h@KF=S  
     break; TH!8G,(w  
   } pQY>  
   for(int index=0;index<MAX_KEY;index++){ Q2NnpsA^6  
    if(hCallWnd[index]==NULL) 's?Fip  
     continue; kU/=Du  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3>" h*U#  
    { U;GoC$b}|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (<Xdj^v  
     bProcessed=TRUE; C(|5,P#5  
    } +_dYfux  
   } SEIu4 l$E  
  } tl5IwrF6;  
  else if((lParam&0xc000ffff)==1){ //Key down '[8b0\  
   switch(wParam) :gq@/COo(  
   { yp^*TD/J  
    case VK_MENU: `W n5 .V  
     MaskBits|=ALTBIT; BfT,  
     break; 8 8$ Y-g5*  
    case VK_CONTROL: uFWgq::\  
     MaskBits|=CTRLBIT; tJPRR_nZv  
     break; )X;cS} yp  
    case VK_SHIFT: )<F\IM  
     MaskBits|=SHIFTBIT; CJixK>Y^  
     break; *h:EE6|  
    default: //judge the key and send message S\5k' ifh  
     break; b H_pNx81  
   } c$kb0VR  
   for(int index=0;index<MAX_KEY;index++) ON0+:`3\  
   { Q; /F0JDH  
    if(hCallWnd[index]==NULL) Ch9!AUiR  
     continue; +~ Ay h[V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O)uM&B=  
    { 1cBhcYv"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); EE6|9K>  
     bProcessed=TRUE; bTGK@~  
    } FraW6T}_  
   } d$rUxqB.  
  } o}+Uy  
  if(!bProcessed){ 78CJ  
   for(int index=0;index<MAX_KEY;index++){ sC_UalOC_  
    if(hCallWnd[index]==NULL) /2Lo{v=0[  
     continue; JlQT5k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ~<- ci  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); V?59 .TJ  
   } uyt-q|83=  
  } :wZ`>,K"t>  
 } B"9hQb  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); iv+jv2ZF%  
} d5"EvT  
8]":[s6x  
BOOL InitHotkey() <>i+R#u{  
{ n qLAby_  
 if(hHook!=NULL){ -5v.1y=!L  
  nHookCount++; gQ=POJ=G  
  return TRUE; S<!_ uq  
 } |zq!CLjD@  
 else G+ v, Hi1  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Rgfhs[Z  
  if(hHook!=NULL) }K80G~O2<  
   nHookCount++; ^Lmc%y  
  return (hHook!=NULL); C'czXZtn  
} p_qm}zp  
BOOL UnInit() :LiDJF  
{ Z3So|M{v  
 if(nHookCount>1){ xY'qm8V  
  nHookCount--; CEuk1$  
  return TRUE; M:Y*Tb6w  
 } O+p-1 C$\  
 BOOL unhooked = UnhookWindowsHookEx(hHook); tNuCxb-  
 if(unhooked==TRUE){ j'Y"/<  
  nHookCount=0; 04PoBv~g  
  hHook=NULL; .k,Jt+  
 } )ko{S[gG  
 return unhooked; @" 0tW:  
} :~3{oZGX&  
~8xh0TSi  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )d(0Y<e @  
{ XyM(@6,'  
 BOOL bAdded=FALSE; d&T6p&V$  
 for(int index=0;index<MAX_KEY;index++){ =Xy`"i{`(  
  if(hCallWnd[index]==0){ Z1$];Q\cX  
   hCallWnd[index]=hWnd; XMEK5Z9Dd  
   HotKey[index]=cKey; I\rZk9F  
   HotKeyMask[index]=cMask; 8| e$  
   bAdded=TRUE; i<wU.JX&h  
   KeyCount++; B >u,)  
   break; D<bU~Gd,P  
  } .D,?u"fk|  
 } x, Vh  
 return bAdded; @?3vRs}h  
} KT];SF ^Y  
]bN&5.|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,t%CK!8  
{ ?S@R~y0K  
 BOOL bRemoved=FALSE; }-{b$6]  
 for(int index=0;index<MAX_KEY;index++){ `[@^m5?b-  
  if(hCallWnd[index]==hWnd){ m c\ C  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2#b<d?"  
    hCallWnd[index]=NULL; dT]L-uRZgy  
    HotKey[index]=0; !jAWNK6  
    HotKeyMask[index]=0; jj3Pf>D+k  
    bRemoved=TRUE; Vo9>o@FlLM  
    KeyCount--; |rxKCzjm  
    break; mC:X4l]5  
   } A3"1D  
  } umm\r&]A  
 } *"ykTqa  
 return bRemoved; L8:]`M Q0  
} chO'Q+pw  
s`#ntset0  
void VerifyWindow() dqD;y#/  
{ E5*-;>2c  
 for(int i=0;i<MAX_KEY;i++){ 3V/_I<y  
  if(hCallWnd!=NULL){ xHv|ca.E  
   if(!IsWindow(hCallWnd)){ x[PEn  
    hCallWnd=NULL; q8?= *1g  
    HotKey=0; U6juS/  
    HotKeyMask=0; }O.LPQ0  
    KeyCount--; N a. nA  
   } $-$5ta{s  
  } ,b6kTQq  
 } 7MO  
} dd \bI_  
M)"]$TM  
BOOL CHookApp::InitInstance() $/[Gys3"  
{ }c` ?0FQ  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); (B>)2:T1  
 hins=AfxGetInstanceHandle(); @[d#mz  
 InitHotkey(); N 8:"&WM  
 return CWinApp::InitInstance(); ezcS[r  
} VLh%XoQx[  
rWoe ?g  
int CHookApp::ExitInstance() #Rin*HL##  
{ 5jn$7iE`  
 VerifyWindow(); ,VKQRmd  
 UnInit(); 0W~.WkD  
 return CWinApp::ExitInstance(); :%/\1$3P  
} W il{FcHY  
u}Ei_ O<z  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file -l-AToO4  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) =<[7J]%  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 6sYV7w,'@  
#if _MSC_VER > 1000 .-.q3ib  
#pragma once j7@!J7S  
#endif // _MSC_VER > 1000 ljup#:n  
nU} ~I)@V  
class CCaptureDlg : public CDialog CV!;oB&  
{ OM20-KDc5  
 // Construction :v#k&Uh3y  
 public: s8t f@H4r  
  BOOL bTray; 5 R,la\!bQ  
  BOOL bRegistered; h`?y2?O  
  BOOL RegisterHotkey(); k(zs>kiP  
  UCHAR cKey; GhqgRzX  
  UCHAR cMask; *-9#/Cp  
  void DeleteIcon(); T$ H2'tK|  
  void AddIcon(); rGTWcJ   
  UINT nCount; 3AvVU]@&Z@  
  void SaveBmp(); PqT"jOF]n  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor xik`W!1S  
  // Dialog Data <9@&oN+T  
  //{{AFX_DATA(CCaptureDlg) "0|BoG  
  enum { IDD = IDD_CAPTURE_DIALOG }; m9#}X_&x  
  CComboBox m_Key; X,>(Y8  
  BOOL m_bControl; U:qF/%w  
  BOOL m_bAlt; ?N4A9W9  
  BOOL m_bShift; GS}0;x  
  CString m_Path; so} l#  
  CString m_Number;  ;e&!  
  //}}AFX_DATA wX-RQ[2X  
  // ClassWizard generated virtual function overrides myD{sE2A  
  //{{AFX_VIRTUAL(CCaptureDlg) 1 h<fJzh  
 public: 'To<T  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 3QCMK^#Z:  
 protected: ewo*7j4*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support q^u1z|'Z  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Lb!r(o>8Cb  
  //}}AFX_VIRTUAL dO+kPC  
  // Implementation 7k 3p'FeS  
 protected: LL{t5(- _  
  HICON m_hIcon; +jcdf}  
  // Generated message map functions 4w@v#H@  
  //{{AFX_MSG(CCaptureDlg) GSQfg  
  virtual BOOL OnInitDialog(); 7. %f01/i  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); -<O JqB  
  afx_msg void OnPaint(); )j\r,9<K+5  
  afx_msg HCURSOR OnQueryDragIcon(); mDZ=Due1  
  virtual void OnCancel(); (Ar?QwP9>  
  afx_msg void OnAbout(); ~Y% : 3  
  afx_msg void OnBrowse(); ,MRvuw0P  
  afx_msg void OnChange(); KZECo1  
 //}}AFX_MSG ,SAbC*nq  
 DECLARE_MESSAGE_MAP() Y\.DQ  
}; O-Dc[t%  
#endif #De(*&y2  
-eUV`&[4  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file NzAQ@E 2d:  
#include "stdafx.h" %=BtOM_2  
#include "Capture.h" . /Y&\<  
#include "CaptureDlg.h" m+H%g"Zj  
#include <windowsx.h> :#Ty^-"]1  
#pragma comment(lib,"hook.lib") _~PO  
#ifdef _DEBUG s){Q&E~X  
#define new DEBUG_NEW 7O:"~L  
#undef THIS_FILE NNgK:YibD  
static char THIS_FILE[] = __FILE__; kr#I{gF  
#endif [ qiOd!  
#define IDM_SHELL WM_USER+1 (JWv *p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &1=g A.ZR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); rrAqI$6  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; z=B< `}@3  
class CAboutDlg : public CDialog 2@fa rx:  
{ A hR0zg  
 public: 691G15  
  CAboutDlg(); Uh*@BmDA  
  // Dialog Data ANotUty;y  
  //{{AFX_DATA(CAboutDlg) 4x(F&0  
  enum { IDD = IDD_ABOUTBOX }; PzLJ/QER  
  //}}AFX_DATA YN/u9[=`  
  // ClassWizard generated virtual function overrides C *a,<`  
  //{{AFX_VIRTUAL(CAboutDlg) G&jZ\IV  
 protected: a/34WFC  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5.dl>,  
  //}}AFX_VIRTUAL KhrFg1|  
  // Implementation *(icR  
 protected: Z&A0hI4d  
  //{{AFX_MSG(CAboutDlg) TQ?#PRB  
  //}}AFX_MSG X>}@EHT  
  DECLARE_MESSAGE_MAP() a/ b92*&k  
}; 4Ppop  
&; s<dDQK  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) SAy{YOLtl  
{ s0 47"Q  
 //{{AFX_DATA_INIT(CAboutDlg) 4b=Gg  
 //}}AFX_DATA_INIT \KCWYi]  
} lr0M<5d=p  
zXjw nep  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) '=p?  
{ W1hX?!xp!  
 CDialog::DoDataExchange(pDX); <}cZi4l'  
 //{{AFX_DATA_MAP(CAboutDlg) $D}"k!H  
 //}}AFX_DATA_MAP G~(& 3  
} aV#h5s  
_\UIc;3Gl  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) eKyqU9  
 //{{AFX_MSG_MAP(CAboutDlg) SetX#e?q~  
 // No message handlers p.5e: i^LJ  
 //}}AFX_MSG_MAP nn'Af,ko/  
END_MESSAGE_MAP() ~{$L9;x  
.+HcAx{/2  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) a>w~FUm*  
: CDialog(CCaptureDlg::IDD, pParent) I )5<DZB9  
{ B>,A(X&  
 //{{AFX_DATA_INIT(CCaptureDlg) nSHNis  
  m_bControl = FALSE; \WX@PfL  
  m_bAlt = FALSE; T=>vh*J  
  m_bShift = FALSE; 6m@0;Ht  
  m_Path = _T("c:\\"); Mb1wYh  
  m_Number = _T("0 picture captured."); PV(4$I}  
  nCount=0; z-I|h~ii  
  bRegistered=FALSE; hVkO%]?  
  bTray=FALSE; [Teh*CV  
 //}}AFX_DATA_INIT >e/ r2U  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 z>p]/Sa  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ++0rF\&  
} )T/J  
2 eHx"Ha  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) D?mDG|Z  
{ _Z$?^gn  
 CDialog::DoDataExchange(pDX); m@[3~ 6A  
 //{{AFX_DATA_MAP(CCaptureDlg) 6#vI;d[^  
  DDX_Control(pDX, IDC_KEY, m_Key); &//2eL  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ?9Ma^C;}  
  DDX_Check(pDX, IDC_ALT, m_bAlt);  E>"8 /  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ($'V& x8T  
  DDX_Text(pDX, IDC_PATH, m_Path); \ FXp*FbQ  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ~?d>fR:X  
 //}}AFX_DATA_MAP ;Yv14{T!  
} hJLT!33:  
R+uw/LG  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 1fRP1  
//{{AFX_MSG_MAP(CCaptureDlg) )(]Envb?A0  
 ON_WM_SYSCOMMAND() `,P >mp)uU  
 ON_WM_PAINT() N8QH*FX/F1  
 ON_WM_QUERYDRAGICON() TaWaHf  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) -x5F;d}  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) |Qr:!MA  
 ON_BN_CLICKED(ID_CHANGE, OnChange) }jiK3?e  
//}}AFX_MSG_MAP ^7^2D2[  
END_MESSAGE_MAP() j76%UG\Ga  
K[]K53Nk  
BOOL CCaptureDlg::OnInitDialog() }/"4|U  
{ %/!+(7 D  
 CDialog::OnInitDialog(); <]'|$8&jY  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); V)h y0_  
 ASSERT(IDM_ABOUTBOX < 0xF000); ~ aA;<#  
 CMenu* pSysMenu = GetSystemMenu(FALSE); t#~XLCE  
 if (pSysMenu != NULL) _*n)mlLln  
 { 7@3sUA_Go  
  CString strAboutMenu; \XDmK   
  strAboutMenu.LoadString(IDS_ABOUTBOX); [8z&-'J=  
  if (!strAboutMenu.IsEmpty()) cJ/4G l  
  { Yt*vqm[WV  
   pSysMenu->AppendMenu(MF_SEPARATOR); 4DM*^=9E  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); c=aO5(i0  
  } xl,ryc3J  
 } Y;eoT J  
 SetIcon(m_hIcon, TRUE); // Set big icon Tyd h9I  
 SetIcon(m_hIcon, FALSE); // Set small icon 6]ZO'Nwo  
 m_Key.SetCurSel(0); |6*Va%LYO-  
 RegisterHotkey(); {=iyK/Uf  
 CMenu* pMenu=GetSystemMenu(FALSE); 9(OAKUQ  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ju.OW`GM  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); p6Gcts?,  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ayeCi8  
 return TRUE; // return TRUE unless you set the focus to a control &F`L}#oL&  
} 37jQ'O U  
LihdZ )  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) TzY *;  
{ KSsWjF}d  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) w5(yCyNp~  
 { =x#&\ui  
  CAboutDlg dlgAbout; dm& /K 4c  
  dlgAbout.DoModal(); cmIT$?J  
 } WGMb8 /{$P  
 else s`1^*Dl%+  
 { u>}zm_  
  CDialog::OnSysCommand(nID, lParam); t)'dF*L  
 } cd&B?\I  
}  Fs)  
qRl/Sl#F  
void CCaptureDlg::OnPaint() 4m\([EO  
{ q)k{W>O  
 if (IsIconic()) OfJd/D  
 { jzMg'z/@J  
  CPaintDC dc(this); // device context for painting `)2[ST  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); oLw|uU-|  
  // Center icon in client rectangle ZRP y~wy>  
  int cxIcon = GetSystemMetrics(SM_CXICON); j.B>v\b_3  
  int cyIcon = GetSystemMetrics(SM_CYICON); f~R[&q +  
  CRect rect; A _i zSzC1  
  GetClientRect(&rect); bBG/gQ  
  int x = (rect.Width() - cxIcon + 1) / 2; *v&*% B  
  int y = (rect.Height() - cyIcon + 1) / 2; }H2#H7!H  
  // Draw the icon FJF3B)Va|  
  dc.DrawIcon(x, y, m_hIcon); q0g1E Jar  
 } Ck@M<(x  
 else ^9=4iXd  
 { om>VQ3  
  CDialog::OnPaint(); Ko+al{2  
 } Q0WY$w1 <  
} 3C#RjA-2[  
zb?kpd}r  
HCURSOR CCaptureDlg::OnQueryDragIcon() _aY.  
{ 4i`S+`#  
 return (HCURSOR) m_hIcon; 82s 5VQ6  
} ;:?*t{r4#  
>3!DOv   
void CCaptureDlg::OnCancel() y{92Lym  
{ bM5CDzH(#X  
 if(bTray) lz}llLb1  
  DeleteIcon(); Pa[?L:E  
  CDialog::OnCancel(); !-ZP*V3}h  
} 1@@y]s_.a  
sS|<&3  
void CCaptureDlg::OnAbout() >Fp&8p`am  
{ O{nC^`X  
 CAboutDlg dlg; p7$3`t 6u  
 dlg.DoModal(); c&b/Joi7@  
} :l;,m}#@  
6&mWIk^VC  
void CCaptureDlg::OnBrowse() 8yvJ`eL-  
{ *0\k Z,#BJ  
 CString str; V(DjF=8  
 BROWSEINFO bi; F^xaz^=`u  
 char name[MAX_PATH]; 2^J/6R$  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); l@#b;M/  
 bi.hwndOwner=GetSafeHwnd(); K#@K"N =  
 bi.pszDisplayName=name; r_q~'r35_  
 bi.lpszTitle="Select folder"; F  "!`X#  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; RPY 6Wh| 4  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); umryA{Ps  
 if(idl==NULL) f}%sO  
  return; H(?e&Qkg  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); H6{Rd+\Z  
 str.ReleaseBuffer(); QY =QQG  
 m_Path=str; ^(J-dK  
 if(str.GetAt(str.GetLength()-1)!='\\') Cc*|Zw  
  m_Path+="\\"; 8TI#7  
 UpdateData(FALSE); <ip)r;  
} y+= \z*9  
ZRO.bMgZF  
void CCaptureDlg::SaveBmp() )Yrr%f`\  
{ }^Z< dbt  
 CDC dc; OoSa95#x  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); *5^ze+:  
 CBitmap bm; `u$24h'!  
 int Width=GetSystemMetrics(SM_CXSCREEN); CM"s9E8y  
 int Height=GetSystemMetrics(SM_CYSCREEN); eiOi3q  
 bm.CreateCompatibleBitmap(&dc,Width,Height); v >NTh  
 CDC tdc; pRmEryR(U  
 tdc.CreateCompatibleDC(&dc); sY_fq.Z  
 CBitmap*pOld=tdc.SelectObject(&bm); ${e -ffyy  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ijg,'a~3E  
 tdc.SelectObject(pOld); $sM]BE:  
 BITMAP btm; L^&do98  
 bm.GetBitmap(&btm); 4">84,-N  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; N*? WUn9]  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); CO7CNN  
 BITMAPINFOHEADER bih; )|Jr|8  
 bih.biBitCount=btm.bmBitsPixel; ,I=O"z>9  
 bih.biClrImportant=0; C>M6&=  
 bih.biClrUsed=0; 6mX:=Q  
 bih.biCompression=0; 8XgVY9]Qm  
 bih.biHeight=btm.bmHeight;  eMztjN  
 bih.biPlanes=1; /1U,+g^O>  
 bih.biSize=sizeof(BITMAPINFOHEADER); 1/!nV  
 bih.biSizeImage=size; Qve`k<Cj"  
 bih.biWidth=btm.bmWidth; K:C+/O  
 bih.biXPelsPerMeter=0; b\H/-7<  
 bih.biYPelsPerMeter=0; Kgps_tY%  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Gtf1}UJC  
 static int filecount=0; 2 e )  
 CString name; k#BU7Exij  
 name.Format("pict%04d.bmp",filecount++); (]o FB$  
 name=m_Path+name; Af$0 o=".  
 BITMAPFILEHEADER bfh; ?! !;XW  
 bfh.bfReserved1=bfh.bfReserved2=0; x>'?IJZ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); /\Jc:v#Q  
 bfh.bfSize=54+size; -0/=k_q_  
 bfh.bfOffBits=54; {3jm%ex  
 CFile bf; @ $ 9m>6V  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ *'s&/vEy  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); +W!'B r  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); zp}yiE!bl  
  bf.WriteHuge(lpData,size); J*/$ywI  
  bf.Close(); >I{4  
  nCount++; P^i6MZ?   
 } l^)o'YS y  
 GlobalFreePtr(lpData); HdDo&#  
 if(nCount==1) NWaI[P  
  m_Number.Format("%d picture captured.",nCount); }kpfJLjY  
 else %9fa98>  
  m_Number.Format("%d pictures captured.",nCount); !x+MVJ]  
  UpdateData(FALSE); `W6:=H  
} Be'?#Qe   
mOABZ#+Fk  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) A632 :V  
{ &:IfhS  
 if(pMsg -> message == WM_KEYDOWN) b6 J2*;XG  
 { o<9yaQ;  
  if(pMsg -> wParam == VK_ESCAPE) Q5T(;u6  
   return TRUE; 3( >(lk  
  if(pMsg -> wParam == VK_RETURN) `kI?Af*;v  
   return TRUE; !]n{l_5r  
 } sqgD?:@J  
 return CDialog::PreTranslateMessage(pMsg); ]=O{7#  
} UXXqE4x  
zEnC[~W  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) yL^M~lws  
{ >^2ZM  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ e/g<<f-  
  SaveBmp(); Nn~tb2\vk  
  return FALSE; 5M/%%Ox  
} g wZ+GA  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~GsH8yA_P  
 CMenu pop; ZdJVs/33Vn  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [J[ysW})W  
 CMenu*pMenu=pop.GetSubMenu(0); 5x93+DkO\  
 pMenu->SetDefaultItem(ID_EXITICON); E1mI Xd;.  
 CPoint pt; Iqe=#hUFe!  
 GetCursorPos(&pt); \rB/83[;u  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 7M&.UzIY`  
 if(id==ID_EXITICON) >n@>h$]  
  DeleteIcon(); "RR./e)h  
 else if(id==ID_EXIT) V{/)RZ/  
  OnCancel(); I\F=s-VVY  
 return FALSE; q329z>  
} L~SrI{aYPf  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); HZ[68T[8b  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ePIly)=X  
 AddIcon(); 9g<_JcN  
 return res; +qu@dU0\`|  
} x _YV{  
9/8@  
void CCaptureDlg::AddIcon() J%O[@jX1  
{ NoSqzJyh  
 NOTIFYICONDATA data; W}<M?b4tP  
 data.cbSize=sizeof(NOTIFYICONDATA); "OlI-^y  
 CString tip; ys~p(  
 tip.LoadString(IDS_ICONTIP); PG-cu$\??  
 data.hIcon=GetIcon(0); Y_aP:+  
 data.hWnd=GetSafeHwnd(); w2M IY_N?  
 strcpy(data.szTip,tip);  \!' {-J  
 data.uCallbackMessage=IDM_SHELL; q^T&A[hMPx  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; P"h,[{Y*>  
 data.uID=98; 3>:zo:;  
 Shell_NotifyIcon(NIM_ADD,&data); 'w |s*5  
 ShowWindow(SW_HIDE); .aAw7LW  
 bTray=TRUE; "=v J }  
} S|=rF<]my  
f(9$"Vi  
void CCaptureDlg::DeleteIcon() gzJ{Gau{)  
{ 7kWZMi  
 NOTIFYICONDATA data; ;{F;e)${M  
 data.cbSize=sizeof(NOTIFYICONDATA); }y -AoG  
 data.hWnd=GetSafeHwnd(); 4,R\3`b  
 data.uID=98; ?L ~=Z\H  
 Shell_NotifyIcon(NIM_DELETE,&data); )=SYJ-ta<  
 ShowWindow(SW_SHOW); }X W#?l  
 SetForegroundWindow(); @zVBn~=i  
 ShowWindow(SW_SHOWNORMAL); "8C(_z+]K`  
 bTray=FALSE; k*UR# z(I  
} SjNwT[.nr7  
[ XY:MU e  
void CCaptureDlg::OnChange() 6m;wO r  
{ m%[2x#  
 RegisterHotkey(); DlQ[}5STF  
} C>(M+qXL+  
*Tlws  
BOOL CCaptureDlg::RegisterHotkey() /n<Ncf  
{ 9O 0  
 UpdateData(); O}\"$n>  
 UCHAR mask=0; jW+VUF-t  
 UCHAR key=0; }1^ tK(Am  
 if(m_bControl) ?6l,   
  mask|=4; 3vvFF]D5k  
 if(m_bAlt) $4ZDT]n  
  mask|=2; 1PT_1[eAR  
 if(m_bShift) s'fcAh,c6  
  mask|=1; ,a?\i JNb  
  key=Key_Table[m_Key.GetCurSel()]; q_m#BE;t  
 if(bRegistered){ 3\U,Kg  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ju2X*  
  bRegistered=FALSE; L^ jC& dF  
 } YQ[&h  
 cMask=mask; 9Av- ;!]  
 cKey=key; ~?8 x0  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 4 *2>R8SX~  
 return bRegistered; `X]2iz  
} 1wH/#K  
HU.6L 'H*  
  四、小结 Ul~}@^m]4}  
W2o8Fu   
  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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