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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: s9aa _Th  
  7GG:1:2+>  
  一、实现方法 Xdl7'~k  
?4%@"49n X  
  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: ]TX"BH"2  
z`esst\aV  
#pragma data_seg("shareddata") rJKac"{  
HHOOK hHook =NULL; //钩子句柄 ~`c(7  
UINT nHookCount =0; //挂接的程序数目 Ouos f1  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 #ni:Bwtl{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 G5,g$yNs  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ] =*G[  
static int KeyCount =0; wT>~7$=L{  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1  U!O"f  
#pragma data_seg() 1<;RI?R[9  
T]UrKj/iF  
  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。 ,+GS.]8<  
j{&$_  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: x +]ek  
s8V:;$ !  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR %n@ ^$&,&;  
cKey,UCHAR cMask) Y?#aUQc  
{ vTsMq>%,<  
 BOOL bAdded=FALSE; Ou7nk:I@  
 for(int index=0;index<MAX_KEY;index++){ GFTOP%Tgl  
  if(hCallWnd[index]==0){ X+[h]A  
   hCallWnd[index]=hWnd; ^d@ME<mb  
   HotKey[index]=cKey; ifI0s)Pn  
   HotKeyMask[index]=cMask; Jt(RF*i  
   bAdded=TRUE; S8k<}5  
   KeyCount++; ^@HWw@GA  
   break; 31 &;3?3>  
  } -^ R?O  
 } m(KBg'kQ  
 return bAdded; w\lc;4U   
} 9}A\Bh tiM  
//删除热键 l8H8c &  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) T6nc/|Ot  
{ MWq1 "c  
 BOOL bRemoved=FALSE; (i;,D-  
 for(int index=0;index<MAX_KEY;index++){ ;Z.sK-NJ4  
  if(hCallWnd[index]==hWnd){ j.kv!;Rj=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ nq qqP  
    hCallWnd[index]=NULL; !S#K6:  
    HotKey[index]=0; L};P*{q2Z  
    HotKeyMask[index]=0; 3g87ir  
    bRemoved=TRUE; L Z}m;  
    KeyCount--; p\22_m_wd  
    break; 5$&',v(  
   } hV}C.- 6h  
  } zK>}x=  
 }  h@CP  
 return bRemoved; ^;'FC vd  
} Xmw%f[Xl  
Jp"[` m  
Vy7 )_D  
  DLL中的钩子函数如下: 45Lzq6  
}6"l`$=Ev  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) FBeo@  
{ hdDL92JVg  
 BOOL bProcessed=FALSE; )(+q~KA}  
 if(HC_ACTION==nCode) _sAcvKH  
 { sL], @z8<k  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 {RN-rF3w  
   switch(wParam) sB0m^Y'  
   {  JH._/I  
    case VK_MENU: O`Y@U?^N  
     MaskBits&=~ALTBIT; s0m k<>z  
     break; /HVxZ2bar  
    case VK_CONTROL: *FFD G_YG?  
     MaskBits&=~CTRLBIT; 0@wXE\s  
     break; #_Z)2ESX  
    case VK_SHIFT: 8Om4G]*|,  
     MaskBits&=~SHIFTBIT; 0-:dzf  
     break; %^l&:\ hy  
    default: //judge the key and send message  y7vA[us  
     break; 4m!w<c0NL  
   } } 8[  
   for(int index=0;index<MAX_KEY;index++){ fyEXnmB;  
    if(hCallWnd[index]==NULL) VE)) `?  
     continue; A "/|h].  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /h 4rW>8D2  
    { )Lg~2]'?j  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); C9 j{:&  
     bProcessed=TRUE; 'HJ<"<  
    } 0IyT(1hS  
   } 3QCCX$,  
  } Ym?VF{e,  
  else if((lParam&0xc000ffff)==1){ //有键按下 0[p"8+x  
   switch(wParam) }b^x#HC  
   { vG:S(/\>  
    case VK_MENU: xoQ(GrBY  
     MaskBits|=ALTBIT; -`D<OSt7  
     break; gI00@p:m  
    case VK_CONTROL: "dHo6CT,y_  
     MaskBits|=CTRLBIT; )cU$I)  
     break; %awr3h>$  
    case VK_SHIFT: 5[]Yxl  
     MaskBits|=SHIFTBIT; qwq5y t?  
     break; Fg0!2MKq*  
    default: //judge the key and send message SN]Na<P  
     break; LtGjHB\+  
   } R-tZC9 @  
   for(int index=0;index<MAX_KEY;index++){ y1B' _s  
    if(hCallWnd[index]==NULL) U$WGe >,  
     continue;  S8O,{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &aPR"X  
    { ;Kh?iq n^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); n7.85p@ua  
     bProcessed=TRUE; q+ `QiPj  
    } 5 p ,HkV  
   } ul]hvK{2  
  } Bh7hF?c Sj  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 EFv^uve  
   for(int index=0;index<MAX_KEY;index++){ y"k %Wa`*  
    if(hCallWnd[index]==NULL) yIg^iZD  
     continue; G +AP."M?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) u/ri {neP{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6!H,(Z]j  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 UkcH+0o  
   } \f7R^;`_<R  
  } K{:[0oIHc  
 } x,HD,VQR/  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 55/)2B2J  
} KE-0/m4yJ  
!6hV|2aJy  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: & jm1  
mV+9*or  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lUdk^7:M  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v8zOY#?  
^%0^DN  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: VO~%O.>  
*y', eB  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }*S`1IWMj  
{ S~)_=4Z  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) j /@<=  
 { tJ .Ln  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Z29LtKr  
  SaveBmp(); ! F<::fN  
  return FALSE; 7g:Lj,Z4L  
 } ez~u A4  
 …… //其它处理及默认处理 IaK J W?  
} s1tkiX{>  
dptfIBYc+  
!x! 1H5"  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 bXA%|7*  
K"ly\$F  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 @>&b&uj7T  
x~F YG  
  二、编程步骤 = ?BhtW  
6 X'#F,M  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ">Ms V/  
o#WECs>  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; @$nh6l>i  
Wiw~oXo  
  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; BAi`{?z$<  
S(/ ^_Y  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; +VL:O]`DJ  
)l.AsfW%  
  5、 添加代码,编译运行程序。 ia,5=SKJ  
O8Z+g{  
三、程序代码 D5:|CMQ  
H?,Dv>.#*  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 14A(ZWwq9  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ,/kZt!  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ g~U<0+&yw%  
#if _MSC_VER > 1000 KpDb%j  
#pragma once Qg0%r bE  
#endif // _MSC_VER > 1000 (" +clb`  
#ifndef __AFXWIN_H__ =uEpeL~d;+  
#error include 'stdafx.h' before including this file for PCH 2vhP'?;K  
#endif bjI3xAs~  
#include "resource.h" // main symbols ?H>^X)Ph  
class CHookApp : public CWinApp H[}lzL)  
{ brG!TJ   
 public: KT+{-"4-  
  CHookApp(); y:_>R=sw  
  // Overrides d c/^  
  // ClassWizard generated virtual function overrides RJKi98xwJ  
  //{{AFX_VIRTUAL(CHookApp) ` TH\0/eE  
 public: R~eLEjezm  
  virtual BOOL InitInstance(); A~X\ dcn  
  virtual int ExitInstance(); =yoR>llbBC  
  //}}AFX_VIRTUAL (?TK P 7  
  //{{AFX_MSG(CHookApp) /F46Ac}I  
  // NOTE - the ClassWizard will add and remove member functions here. <H{K&,Z(ZM  
  // DO NOT EDIT what you see in these blocks of generated code ! :*^aSPlV  
  //}}AFX_MSG A%x0'?GU  
  DECLARE_MESSAGE_MAP() FHEP/T\5  
}; @/:7G.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); q*tGlM@R?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1hSV/%v_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Y[_|sIy*  
BOOL InitHotkey(); 0*+EYnu+  
BOOL UnInit(); \3"B$Sp|=  
#endif  \S1W,H|  
ijvDFyN>  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. +-9-%O.(;  
#include "stdafx.h" t0r0{:  
#include "hook.h" <Q"G aqZ  
#include <windowsx.h> .lM]>y)  
#ifdef _DEBUG G e5Yz.Q v  
#define new DEBUG_NEW vVIN D  
#undef THIS_FILE 0pG + yec  
static char THIS_FILE[] = __FILE__; :U=3*f.{  
#endif U@CAQ?  
#define MAX_KEY 100 ofw&? Sk0  
#define CTRLBIT 0x04 uPapINj  
#define ALTBIT 0x02 87W!R<G  
#define SHIFTBIT 0x01 }0Uh<v@  
#pragma data_seg("shareddata") O[{/P:a  
HHOOK hHook =NULL; 7l[ @c|e  
UINT nHookCount =0; .tppCy  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey nRu %0Op  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 'o4`GkNh)  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey GB<.kOGQ[  
static int KeyCount =0; |=0w_)Fa]  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift uv8k ea .(  
#pragma data_seg() 43-Bx`6\  
HINSTANCE hins; .'Q*_};W  
void VerifyWindow(); [CfZE  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 8 hhMuh  
//{{AFX_MSG_MAP(CHookApp) "Nb2[R  
// NOTE - the ClassWizard will add and remove mapping macros here. ]z8/S!?  
// DO NOT EDIT what you see in these blocks of generated code! b 9"t%R9/Q  
//}}AFX_MSG_MAP D&I/Tbc  
END_MESSAGE_MAP() R4R\B  
cWZ uph\  
CHookApp::CHookApp() 6<>1,wbq  
{ 'q_Z dw%  
 // TODO: add construction code here, _9H]:]1QH  
 // Place all significant initialization in InitInstance HRrR"b9:  
} =Ul"{T<  
^Y;,cLXJ  
CHookApp theApp; @: =vK?8L  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @ S[As~9X  
{ RticGQy&5  
 BOOL bProcessed=FALSE; 3c7i8b$  
 if(HC_ACTION==nCode) oNw=O>v  
 { t 4zUj%F  
  if((lParam&0xc0000000)==0xc0000000){// Key up [KHlApL  
   switch(wParam) "crp/Bj?  
   { xV`l6QS  
    case VK_MENU: 7&wxnxSk^  
     MaskBits&=~ALTBIT; mSYm18   
     break; 3**t'iWQ  
    case VK_CONTROL: !sEhjJV^7  
     MaskBits&=~CTRLBIT; iR./9}Ze  
     break; =)c-Xz  
    case VK_SHIFT: 53ZbtEwhwr  
     MaskBits&=~SHIFTBIT; oqysfLJ  
     break; q+oc^FD?@  
    default: //judge the key and send message qm_m8   
     break; )*XWe|H_  
   } ?PTXgIC  
   for(int index=0;index<MAX_KEY;index++){ k'N``.  
    if(hCallWnd[index]==NULL) S ~h*U2  
     continue; yocFdI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4e eh+T  
    { RXcN<Y&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); !G[%; d  
     bProcessed=TRUE; ~/)]`w  
    } dI%ho<zm]  
   } m a@V>*u  
  } g[t paQ  
  else if((lParam&0xc000ffff)==1){ //Key down R) dP=W*  
   switch(wParam) r)Lm| S  
   { & fWC-|  
    case VK_MENU: i^iu #WC  
     MaskBits|=ALTBIT; CadIu x^  
     break; eD2eDxN2  
    case VK_CONTROL:  <)~-]  
     MaskBits|=CTRLBIT; _izjvg  
     break; g] }!  
    case VK_SHIFT: 0%[IG$u)|  
     MaskBits|=SHIFTBIT; tJ6Q7 J;n  
     break; ~8mz.ZdY  
    default: //judge the key and send message hgW1g#  
     break; `[#id@Z1  
   } ]1>R8  
   for(int index=0;index<MAX_KEY;index++) chUYLX}45  
   { !03JA9lo  
    if(hCallWnd[index]==NULL) ;L-)$Dy4  
     continue; #\}FQl6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ug546Bz  
    { PH:5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #X %!7tU6  
     bProcessed=TRUE; pU !:  
    } \<`oW>  
   } XR7v\rd  
  } rFzj\%xa[  
  if(!bProcessed){ Ly^bP>2i  
   for(int index=0;index<MAX_KEY;index++){ )D/ ,QWk  
    if(hCallWnd[index]==NULL) w}OBp^V^  
     continue; cUG^^3!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) l=l$9H,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6s~B2t:Y  
   }  dm=?o  
  } r"{jrBK$  
 } ,<#Rk 'y$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ys`oHS f  
} 3T0-RP*  
iEr?s-or  
BOOL InitHotkey() ilJ`_QN  
{ 0k16f3uI   
 if(hHook!=NULL){ *<67h*|)  
  nHookCount++; r5nHYV&7  
  return TRUE; V,Nu!$)J  
 } wL, -"  
 else #>)z}a]  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); =$gBWS  
  if(hHook!=NULL) Y7p@NG&1q  
   nHookCount++; & ck}3\sQ  
  return (hHook!=NULL); xxl|j$m  
} e/:?9  
BOOL UnInit() L8h!%56s  
{ )~R[aXkvY  
 if(nHookCount>1){ Cx/J_Ro#  
  nHookCount--; FI?J8a  
  return TRUE; c;X,-Q9  
 } fi*b]a\'  
 BOOL unhooked = UnhookWindowsHookEx(hHook); < B]qqqP  
 if(unhooked==TRUE){ "p;tj74O9  
  nHookCount=0; j xkQ #Y  
  hHook=NULL; M$@~|pQ<  
 } K`9~#Zx$  
 return unhooked; a$Ud"  
} ?K:\WW  
0ElEaH1z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -`\^_nVC  
{ {'M/wT)FeC  
 BOOL bAdded=FALSE; p2rT0gu!  
 for(int index=0;index<MAX_KEY;index++){ ?uL-qsU  
  if(hCallWnd[index]==0){ H.;}%id  
   hCallWnd[index]=hWnd; Q[NoFZ V!  
   HotKey[index]=cKey; ~>9G\/u j  
   HotKeyMask[index]=cMask; bK0(c1*a[e  
   bAdded=TRUE; 9,_~qWw  
   KeyCount++; &a=rJvnIO&  
   break; 8+gp"!E  
  } j?|Vx'  
 } [s]$&  
 return bAdded; :fL7"\ pf~  
} >}~[ew  
1irSI,j%z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >5kz#|@P  
{ 57;0,k5Gy  
 BOOL bRemoved=FALSE; 5,^DT15a4P  
 for(int index=0;index<MAX_KEY;index++){ G,?a8(  
  if(hCallWnd[index]==hWnd){ 8r+u!$i!H  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !x R9I0V5  
    hCallWnd[index]=NULL; ibQ xL3  
    HotKey[index]=0; j[dZ*Jr_  
    HotKeyMask[index]=0; F::Ki4{jJ  
    bRemoved=TRUE; rL"]m_FK  
    KeyCount--; }MMKOr(  
    break; [efU)O&  
   } b?iPQ$NyQ  
  } DDGDj)=`  
 } b,+KXx  
 return bRemoved; zT&"rcT">  
} e }C,)   
*@#Gc%mGu  
void VerifyWindow() EFVZAY"+!;  
{ ETU-6qFtO  
 for(int i=0;i<MAX_KEY;i++){ B%Qo6*b  
  if(hCallWnd!=NULL){ !=,zy  
   if(!IsWindow(hCallWnd)){ ]W Yub1  
    hCallWnd=NULL; >/4[OPB0R  
    HotKey=0; #V/{DPz  
    HotKeyMask=0; 52o^]  
    KeyCount--; 0F- +)S?M[  
   } PZJn/A1  
  } T}Wbt=\M  
 } u e  
} P#!g P3  
m5N,[^-  
BOOL CHookApp::InitInstance() )ADI[+KW  
{ j?o6>j  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); W>+`e]z  
 hins=AfxGetInstanceHandle(); :PN%'~}n  
 InitHotkey(); Q~wS2f`)  
 return CWinApp::InitInstance(); J`[jub  
} wI 7gHp  
#P}n+w_@  
int CHookApp::ExitInstance() |gxPuAXa)  
{ tF/Ni*\^rV  
 VerifyWindow(); #=y)Wuo=  
 UnInit(); ESoC7d&.K{  
 return CWinApp::ExitInstance(); 'Y ,2CN  
} x5PM ]~"p  
,Il) tH  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^}vf  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 7DK}c]js  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ tpA-IL?KQw  
#if _MSC_VER > 1000 ~Y~M}4  
#pragma once aiz ws[C  
#endif // _MSC_VER > 1000 }[!=O+g O  
0%&}wUjV  
class CCaptureDlg : public CDialog A*+gWn,4Y_  
{ (c}!gjm  
 // Construction yLCMu | +  
 public: X0j>g^b8  
  BOOL bTray; W(ryL_#;  
  BOOL bRegistered; fNx!'{o"  
  BOOL RegisterHotkey(); ~V?z!3r-)  
  UCHAR cKey; ]CcRI|g}  
  UCHAR cMask; _\k?uUo&,^  
  void DeleteIcon(); @?]>4+Oa0  
  void AddIcon(); 1@LUxU#Uu$  
  UINT nCount; J"E _i]  
  void SaveBmp(); s1[.L~;J  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ~e,l2 <  
  // Dialog Data ~cO iv  
  //{{AFX_DATA(CCaptureDlg) b1'849i'y=  
  enum { IDD = IDD_CAPTURE_DIALOG }; `IBNBJy  
  CComboBox m_Key; !+Y+P?  
  BOOL m_bControl; k_u!E3{~  
  BOOL m_bAlt; 7uw-1F5x7  
  BOOL m_bShift; )n9,?F#l  
  CString m_Path; K fVsnL_  
  CString m_Number; NM:$Q<n  
  //}}AFX_DATA j7w9H/XF}  
  // ClassWizard generated virtual function overrides n;=FD;}j+  
  //{{AFX_VIRTUAL(CCaptureDlg) l*wGKg"x3  
 public: I<<1mEk  
  virtual BOOL PreTranslateMessage(MSG* pMsg); *K?UWi#$  
 protected: d:A'|;']  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2x|F Vp  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 5"b1: w@  
  //}}AFX_VIRTUAL cQd?,B3#F  
  // Implementation *v8daF  
 protected: sxuP"4  
  HICON m_hIcon; OUwnVAZZ6  
  // Generated message map functions [+A]E,pv]1  
  //{{AFX_MSG(CCaptureDlg) 9vDOSwU*  
  virtual BOOL OnInitDialog(); m0.g}N-w  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 2auJp .  
  afx_msg void OnPaint(); lZIJ[.  
  afx_msg HCURSOR OnQueryDragIcon(); jzpDKc%  
  virtual void OnCancel(); J_yXL7d  
  afx_msg void OnAbout(); `w4'DB-R)  
  afx_msg void OnBrowse(); U8>4ClJ4  
  afx_msg void OnChange(); ()Wu_Q  
 //}}AFX_MSG [P~7kNFOh  
 DECLARE_MESSAGE_MAP() UB>BVBCt  
}; 6Xo"?f  
#endif 1K|F;p  
x{ `{j'  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 3]}RjOTU  
#include "stdafx.h" M?('VOy)  
#include "Capture.h" Br<lP#u=G  
#include "CaptureDlg.h" :}#)ipr  
#include <windowsx.h> 4DL2 A;T  
#pragma comment(lib,"hook.lib") /|&4&$  
#ifdef _DEBUG >tMI%r  
#define new DEBUG_NEW 4|Y1W}!0/  
#undef THIS_FILE 1Lje.%(E.  
static char THIS_FILE[] = __FILE__; dSTyx#o  
#endif ~9k E.  
#define IDM_SHELL WM_USER+1 ^  ~1QA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |XNw&X1VF  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ui`EODhA(  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; "D4% A!i  
class CAboutDlg : public CDialog (s|WmSQ  
{ oy[ px9Wx  
 public: 16@<G  
  CAboutDlg(); F+BCzsm7$  
  // Dialog Data G[u6X_Q  
  //{{AFX_DATA(CAboutDlg) S{MB$JA  
  enum { IDD = IDD_ABOUTBOX }; %B1TN#KoT  
  //}}AFX_DATA s]A8C^;c  
  // ClassWizard generated virtual function overrides n?D/bXp  
  //{{AFX_VIRTUAL(CAboutDlg) tV pXA'"!x  
 protected: t3^`:T\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >6WZSw/Hq  
  //}}AFX_VIRTUAL Tz9 (</y  
  // Implementation v}AjW%rB  
 protected: '+iLW~   
  //{{AFX_MSG(CAboutDlg) D ZZRu8~  
  //}}AFX_MSG wm ?%&V/#  
  DECLARE_MESSAGE_MAP() k5Q1.;fW76  
}; _):@C:6  
S fY9PNck\  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) G8?Do+[  
{ l(F\5Ys  
 //{{AFX_DATA_INIT(CAboutDlg) ~d\V>  
 //}}AFX_DATA_INIT 9FNsW$b?  
} Z1$U[Tsd  
o.zP1n|G~r  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 4!96k~d}  
{ [,ulz4"  
 CDialog::DoDataExchange(pDX); ;+o6"ky5  
 //{{AFX_DATA_MAP(CAboutDlg) {+{p.  
 //}}AFX_DATA_MAP xA2I+r*o  
} Q]K$yo  
(=1zMZ o  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)  nsV=  
 //{{AFX_MSG_MAP(CAboutDlg) >/}p{Tj  
 // No message handlers s!MD8i a  
 //}}AFX_MSG_MAP ./'d^9{  
END_MESSAGE_MAP() eMV8`&c'  
"j8=%J{  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) l1L8a I,8  
: CDialog(CCaptureDlg::IDD, pParent) C v*K.T  
{ HmU6:8V *Z  
 //{{AFX_DATA_INIT(CCaptureDlg) #D{Eq8dp  
  m_bControl = FALSE; 9Nv?j=*$  
  m_bAlt = FALSE; X$P(8'[9A  
  m_bShift = FALSE; [[N${C  
  m_Path = _T("c:\\"); %" l;  
  m_Number = _T("0 picture captured."); o#z$LT1dY  
  nCount=0; tW-[.Y -M,  
  bRegistered=FALSE; w"QZ7EyJ  
  bTray=FALSE; 4qsxlN>4O  
 //}}AFX_DATA_INIT 0u( 0*Xl  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 *0V'rH)  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); {t|#>UCK  
} &^ s8V]^  
K@Q%NK,  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) iG~&uEAJ  
{ OqF8KJnO;  
 CDialog::DoDataExchange(pDX); nr}Ols  
 //{{AFX_DATA_MAP(CCaptureDlg) YvP62c \  
  DDX_Control(pDX, IDC_KEY, m_Key); 9~a5R]x2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); P-8QXDdr  
  DDX_Check(pDX, IDC_ALT, m_bAlt); LH`2Y,E  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); a +~b3  
  DDX_Text(pDX, IDC_PATH, m_Path); w2('75$J  
  DDX_Text(pDX, IDC_NUMBER, m_Number); UH\{:@GjNO  
 //}}AFX_DATA_MAP VUHf-bKl  
} E GZiWBr  
1:@ScHS  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ke<5]&x  
//{{AFX_MSG_MAP(CCaptureDlg) Lh.-*H  
 ON_WM_SYSCOMMAND() >@4AxV\  
 ON_WM_PAINT() 9!Xp+<  
 ON_WM_QUERYDRAGICON() Cp>y<C"  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) CW/L(RQ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) A9"!=/~  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ^\J-LU|"B  
//}}AFX_MSG_MAP cc}#-HKR[  
END_MESSAGE_MAP() 9zCuVUcd$.  
1 Qz@  
BOOL CCaptureDlg::OnInitDialog() G^dzE/ :  
{ Z d@B6R  
 CDialog::OnInitDialog(); E?BF8t_fTE  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); hy$VG%b;#  
 ASSERT(IDM_ABOUTBOX < 0xF000); f4+wP/n&  
 CMenu* pSysMenu = GetSystemMenu(FALSE); m^TN6/])  
 if (pSysMenu != NULL) eT(X Ri0  
 { Odhr=Hs  
  CString strAboutMenu; _RZ"WA^[  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Iu >4+6  
  if (!strAboutMenu.IsEmpty()) ,]]IJ;:w  
  { 8]1,EE<  
   pSysMenu->AppendMenu(MF_SEPARATOR); Zt=P 0  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); y+{)4ptg$<  
  } )ZrB-(u~k  
 } j*4:4B%  
 SetIcon(m_hIcon, TRUE); // Set big icon hJir_=  
 SetIcon(m_hIcon, FALSE); // Set small icon 3/]FT#l]i  
 m_Key.SetCurSel(0); y"U)&1 c%  
 RegisterHotkey(); CY[3%7 fv  
 CMenu* pMenu=GetSystemMenu(FALSE); $4)L~g|  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); `R.Pz _oe  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); T,vh=UF%]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Q |S>C%4?  
 return TRUE; // return TRUE unless you set the focus to a control BS?$eai@:9  
} bz~aj}"`  
Rr[Wka9[  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) <63TN`B  
{ v '^}zO  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) wrXn|aV  
 { } _^ vvu  
  CAboutDlg dlgAbout; 3#>%_@<  
  dlgAbout.DoModal(); Qc PU{#6  
 } y c 8 h}`  
 else gjX1z{{~L  
 { {Ja(+NQ  
  CDialog::OnSysCommand(nID, lParam); b0@K ~O;g  
 } ;)P=WS:=  
} TqfL Sm|  
Ck"db30.  
void CCaptureDlg::OnPaint() u&UmI-}  
{ >lzXyT6x8  
 if (IsIconic()) 83{P7PBQ;]  
 { -!li,&,A1  
  CPaintDC dc(this); // device context for painting >+Iph2]  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 7y)Ar 8!D  
  // Center icon in client rectangle fk>{  
  int cxIcon = GetSystemMetrics(SM_CXICON); ;c DMcKKIA  
  int cyIcon = GetSystemMetrics(SM_CYICON); 2efdJ&eIV  
  CRect rect; BF;}9QebmS  
  GetClientRect(&rect); /;1O9HJa  
  int x = (rect.Width() - cxIcon + 1) / 2; Hz==,NR-W  
  int y = (rect.Height() - cyIcon + 1) / 2; #:/27  
  // Draw the icon d"Wuu1tEY  
  dc.DrawIcon(x, y, m_hIcon); NuUiW*|`7  
 } z 1^fG)  
 else 3G2iRr.o  
 { Oe :S1f  
  CDialog::OnPaint(); !"Q%I#8uh  
 } %.l={B,i  
} *vEj\  
tns8B  
HCURSOR CCaptureDlg::OnQueryDragIcon() V |}9bNF  
{ &1&OXm$  
 return (HCURSOR) m_hIcon; MV!d*\  
} ;FF+uK  
y;<suGl  
void CCaptureDlg::OnCancel() #<Xq\yC51  
{ =NI?Jk*iAq  
 if(bTray) }Q]-Y :  
  DeleteIcon(); h{$k%YJ?  
  CDialog::OnCancel(); 0( A  ?&  
} H{S+^'5Y.  
kS9;Tjcx  
void CCaptureDlg::OnAbout() Fu5Y<*x  
{ "19#{yX4  
 CAboutDlg dlg; ?_A[E]/H  
 dlg.DoModal(); %iEdUV\$  
} NqNU:_}  
~1twGG_;  
void CCaptureDlg::OnBrowse() n]D io  
{ 'd&d"E[  
 CString str; yg* #~,  
 BROWSEINFO bi; W83PMiN"T-  
 char name[MAX_PATH]; z/f._Z(  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); EJb+yy6  
 bi.hwndOwner=GetSafeHwnd(); |O oczYf  
 bi.pszDisplayName=name; Yg,b ;H  
 bi.lpszTitle="Select folder"; ju "?b2f  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Hc8He!X*#  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); dJJq]^|  
 if(idl==NULL) L=EkY O%\"  
  return; WG,1%=M@  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ^,AE;Z T7  
 str.ReleaseBuffer(); Q@>1z*'I  
 m_Path=str; C<I?4WM  
 if(str.GetAt(str.GetLength()-1)!='\\') Qzo -Yw`=  
  m_Path+="\\"; Jvsy 6R  
 UpdateData(FALSE); xU0iz{9  
} ^" 54Q^SH  
|uw48*t  
void CCaptureDlg::SaveBmp() Fw{@RQf8  
{ SG|AJ9  
 CDC dc; \ERxr   
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); F8{gJaP x  
 CBitmap bm; yI#qkl-  
 int Width=GetSystemMetrics(SM_CXSCREEN); ]Sa#g&}T>  
 int Height=GetSystemMetrics(SM_CYSCREEN); . _|=Btoo  
 bm.CreateCompatibleBitmap(&dc,Width,Height); KW[y+c u.#  
 CDC tdc; ,IqE<i!U  
 tdc.CreateCompatibleDC(&dc); -Fn/=  
 CBitmap*pOld=tdc.SelectObject(&bm); U]vUa^nG  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Y$n+\K  
 tdc.SelectObject(pOld); !-470J  
 BITMAP btm; ]GY8f3~|{  
 bm.GetBitmap(&btm); RMT9tXe*5  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 0=6mb]VUi=  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); /}>8|#U3y  
 BITMAPINFOHEADER bih; hLgX0QV  
 bih.biBitCount=btm.bmBitsPixel; `^hA&/1  
 bih.biClrImportant=0; %M'`K  
 bih.biClrUsed=0; g_P98_2f.k  
 bih.biCompression=0; kwT)j(pp<  
 bih.biHeight=btm.bmHeight; 0[%{YmI{W  
 bih.biPlanes=1; CkNR{?S  
 bih.biSize=sizeof(BITMAPINFOHEADER); yx-"&K=`  
 bih.biSizeImage=size; :LNZC,-f}5  
 bih.biWidth=btm.bmWidth; U2<q dknB  
 bih.biXPelsPerMeter=0; @YH>|{S&  
 bih.biYPelsPerMeter=0; 4_j_!QH87  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS);  ov,  
 static int filecount=0; V'W*'wo   
 CString name; ro<w8V9.a  
 name.Format("pict%04d.bmp",filecount++); Y 'X!T8  
 name=m_Path+name; "i/GzD7`n  
 BITMAPFILEHEADER bfh; hDW_a y4  
 bfh.bfReserved1=bfh.bfReserved2=0; $#s5y~z  
 bfh.bfType=((WORD)('M'<< 8)|'B'); sGtxqnX:J  
 bfh.bfSize=54+size; ?;`GCE  
 bfh.bfOffBits=54; JcmMbd&B  
 CFile bf; 36+/MvIT  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ R(^Sse  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); x/M$_E<G  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); jFe8s@7  
  bf.WriteHuge(lpData,size); vvxD}p=y  
  bf.Close(); L v/}&'\(  
  nCount++; u;rmqo1  
 } RS}_cm0  
 GlobalFreePtr(lpData); l{C]0^6>i  
 if(nCount==1) :M{ )&{D  
  m_Number.Format("%d picture captured.",nCount); R0*P,~L;|  
 else U9b[t  
  m_Number.Format("%d pictures captured.",nCount); exiu;\+j  
  UpdateData(FALSE); SUMfebW5  
} {[Ri:^nHgL  
T?!SEblP]  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) "'Fvt-<^S7  
{ IO8 @u;&  
 if(pMsg -> message == WM_KEYDOWN) ,~Xe#e M  
 { |&WYu,QQ4  
  if(pMsg -> wParam == VK_ESCAPE) O]hUOc `k  
   return TRUE; ,z#D[5  
  if(pMsg -> wParam == VK_RETURN) C}xfo}i  
   return TRUE; ,JK0N_=  
 } af>i  
 return CDialog::PreTranslateMessage(pMsg); L,#YP#O,j  
} rqN+0CT  
|z_Dw$-xm  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?87\_wL/j  
{ Vfy@?x= &  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ p7`9 d1n  
  SaveBmp(); _/>I-\xWA  
  return FALSE; &0Y |pY  
} a-,*iK{_u  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ P8dMfD*"E  
 CMenu pop; s,[ I_IiPf  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); -nC&t~sD  
 CMenu*pMenu=pop.GetSubMenu(0); _^b\#Jz4U3  
 pMenu->SetDefaultItem(ID_EXITICON); kn>qX{W  
 CPoint pt; ]rY9t@  
 GetCursorPos(&pt); 'G % ]/'_U  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); $=E4pb4Y  
 if(id==ID_EXITICON) mMZ{W+"[f  
  DeleteIcon(); L7rr/D  
 else if(id==ID_EXIT) 5TuwXz1v  
  OnCancel(); e#mf{1&  
 return FALSE; ^znUf4N1  
} jmq^98jB  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); &glh >9:G  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Pz2Q]}(w  
 AddIcon(); ~gZ1*8 s`  
 return res; [olSgq!3  
} CXoiA"P  
WQVU 82b*  
void CCaptureDlg::AddIcon() l 7dm@S  
{ 3 I%N4K4  
 NOTIFYICONDATA data; l{8O'4;  
 data.cbSize=sizeof(NOTIFYICONDATA); g]z k`R5  
 CString tip; B!quj!A  
 tip.LoadString(IDS_ICONTIP); yxpv;v:)=  
 data.hIcon=GetIcon(0); 5,f`5'$  
 data.hWnd=GetSafeHwnd(); |-/@3gPO  
 strcpy(data.szTip,tip); 7oIHp_Zq  
 data.uCallbackMessage=IDM_SHELL; "u~` ZV(  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; H*<E5^#dw  
 data.uID=98; ke W7pN?  
 Shell_NotifyIcon(NIM_ADD,&data); r>bgCQ#-n  
 ShowWindow(SW_HIDE); :/][ n9J^  
 bTray=TRUE; 0~$9z+S  
} DcaKGjp  
|;Jt * _  
void CCaptureDlg::DeleteIcon() /O.q4p  
{ R{A$|Ipaq  
 NOTIFYICONDATA data; JleClB(2n/  
 data.cbSize=sizeof(NOTIFYICONDATA); _IU5HT}2  
 data.hWnd=GetSafeHwnd(); 6j {ynt  
 data.uID=98; 85|u;Fxf  
 Shell_NotifyIcon(NIM_DELETE,&data); b}Im>n!  
 ShowWindow(SW_SHOW); &I'J4gk[  
 SetForegroundWindow(); K9&Q@3V  
 ShowWindow(SW_SHOWNORMAL); {GCp5  
 bTray=FALSE; hTv*4J&@|  
} ;DZj.| Sj+  
rf+}J_  
void CCaptureDlg::OnChange() CL5^>. }  
{ "-Ny f  
 RegisterHotkey(); v4rO 0y=C  
} GGHeC/4  
Iy*Q{H3[  
BOOL CCaptureDlg::RegisterHotkey() WixEnsJ  
{ \+U;$.)3  
 UpdateData(); #Cs/.(<  
 UCHAR mask=0;  Y~^R^J  
 UCHAR key=0; $;ny`^8  
 if(m_bControl) |p*cI @  
  mask|=4; GK11fZpO:i  
 if(m_bAlt) N&k\X]U  
  mask|=2; n'pJl  
 if(m_bShift) ON!Fk:-  
  mask|=1; @ kv~2m  
  key=Key_Table[m_Key.GetCurSel()]; 0;`FS /[(f  
 if(bRegistered){ %UooZO  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); # 7d vT=  
  bRegistered=FALSE; ;IPk+,hpmi  
 } ]QHZ [C  
 cMask=mask; CcV@YST?  
 cKey=key; #!TlalV  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); dQp>z%L)  
 return bRegistered; oIj/V|ByK  
} >^#Liwm  
bY,dWNS:  
  四、小结 UHfE.mTjM  
G;/> N'#  
  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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