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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: ;Fl<v@9  
  HV]Ze>}  
  一、实现方法 O ++/ry%k  
N=,j}FY  
  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: es.CLkuD7Y  
LhJa)jFQ  
#pragma data_seg("shareddata") 1]4^V7y  
HHOOK hHook =NULL; //钩子句柄 |ek ak{js  
UINT nHookCount =0; //挂接的程序数目 k1N$+h ;\  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 : iY$82wQ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 gb-{2p>}  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey AO 0!liQ  
static int KeyCount =0; @ Gjny BJ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 s_wUM)!  
#pragma data_seg() J?712=9  
2M6dMvS  
  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。 sy<iKCM\  
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  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: mVH,HqsXa  
k&s; {|!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR XQ;I,\m  
cKey,UCHAR cMask) ~a+NJ6e1  
{ <O857 j  
 BOOL bAdded=FALSE; $Tl<V/  
 for(int index=0;index<MAX_KEY;index++){ k khE}qSD  
  if(hCallWnd[index]==0){ i Q`]ms+  
   hCallWnd[index]=hWnd; -Wo15O"  
   HotKey[index]=cKey; Y_H/3?b%  
   HotKeyMask[index]=cMask; RtF8A5ys  
   bAdded=TRUE; 9R]](g#  
   KeyCount++; +g\;bLT  
   break; juno.$ 6  
  } 3o8\/-*<  
 } Y)p4]>lT+8  
 return bAdded; `^8*<+  
} |XcH]7Ai"  
//删除热键 -z C]^Ho@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) hLuJWjCV  
{ yFeeG3 n3  
 BOOL bRemoved=FALSE; eK_*q -  
 for(int index=0;index<MAX_KEY;index++){ ;) pl{_  
  if(hCallWnd[index]==hWnd){ !EFBI+?&  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ y lL8+7W  
    hCallWnd[index]=NULL; <f%/px%1  
    HotKey[index]=0; 9Q[>.):  
    HotKeyMask[index]=0; -0|K,k  
    bRemoved=TRUE; cC6z,0`3  
    KeyCount--; }:#dV B+  
    break; o~~9!\  
   } z}APR@?`n8  
  } P/ aDd@j  
 } 5#uO'<2$  
 return bRemoved; mTjm92  
} b(T@~P/  
#<#%>Y^  
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  DLL中的钩子函数如下: x;U|3{I o  
j+>Q#&h9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $%He$t  
{ YBylyVZ  
 BOOL bProcessed=FALSE; ^ KAG|r9  
 if(HC_ACTION==nCode) (+MC<J/i  
 { M_&4]\PkCy  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 VD;j[~/Z  
   switch(wParam) n6cq\@~A  
   {  &>=#w"skb6  
    case VK_MENU: ZLJNw0!=|t  
     MaskBits&=~ALTBIT; qY}Cg0[@g  
     break; JK^[{1 JI  
    case VK_CONTROL: Kq7C0)23  
     MaskBits&=~CTRLBIT; 84Zgo=P}  
     break; 5; f\0<-  
    case VK_SHIFT: NhDA7z`b'J  
     MaskBits&=~SHIFTBIT; 4K,''7N3  
     break; #WEq-0L   
    default: //judge the key and send message qy9i9$8  
     break; x7gjG"V  
   } tR O IBq|  
   for(int index=0;index<MAX_KEY;index++){ CKC0{J8g  
    if(hCallWnd[index]==NULL) JN^bo(kb  
     continue; k/^g*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) j |td,82.  
    { 5B|,S1b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); \3j)>u,r  
     bProcessed=TRUE; u\5g3BH  
    } b7v dk  
   } B(Y.`L? %E  
  } $3:X+X  
  else if((lParam&0xc000ffff)==1){ //有键按下 7vNtv9  
   switch(wParam) UT;4U;a,m  
   { ~,Mr0  
    case VK_MENU: xppkLoPK  
     MaskBits|=ALTBIT; %yhI;M^  
     break; >;}]pI0T  
    case VK_CONTROL: |D(&w+(  
     MaskBits|=CTRLBIT; *[ #*n n  
     break; ||fvKyKW>  
    case VK_SHIFT: Q 3X  
     MaskBits|=SHIFTBIT; cuMc*i$w!  
     break; q\_DJ)qpn  
    default: //judge the key and send message <i7agEdZD  
     break; qZ?{-Vw  
   } TK %< a/  
   for(int index=0;index<MAX_KEY;index++){ eaxfn]gV  
    if(hCallWnd[index]==NULL) fp-m.d:|  
     continue; /=ACdJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Wxk; g  
    { *#GDi'0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ex0oAt^  
     bProcessed=TRUE; & qL<C  
    } Z fqQ {_  
   } L6kZ2-6  
  } PC0HH  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 O(Td:Zdp  
   for(int index=0;index<MAX_KEY;index++){ OaNc9c"  
    if(hCallWnd[index]==NULL) <vLdBfw&N  
     continue; i :EO(`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /Mx.:.A&$  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); kU(kU2u%9  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 %xpd(&)n  
   } Yg|"-  
  } BDp:9yau  
 } AtT"RG-6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9nO(xJ"e4  
} 7 y>(H<^>  
pMDH  
  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: $>(9~Yh0  
G V=OKf#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); l\Cu1r-z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /khnl9~+  
uYabJqV  
  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: ?4MSgu  
HoV{Uzm  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <B=[hk!  
{ {9Xm<}%u]]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) gu!](yEgl  
 { o[n<M> @  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 qr9Imr0w<  
  SaveBmp(); !^]q0x  
  return FALSE; b.@H1L  
 } F/xCG nP-  
 …… //其它处理及默认处理 u(8~4P0w  
} bu_/R~&3{  
YV4 : 8At1  
:+<t2^)rD  
  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。 EZ*t$3.T  
Dl&PL  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 x g{VP7  
tr5'dX4]  
  二、编程步骤 K:uQ#W.&  
S;>4i!Mb ^  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; C)U #T)  
A3<^ U  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 9n-T5WP  
e"lD`*U8R  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; (;C$gnr.C  
2c"/QT  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; '1Y<RD>x  
T<XfZZ)l<`  
  5、 添加代码,编译运行程序。 8F\~Wz7K  
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三、程序代码 ZRX^^yN  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL BB0g}6M  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) k"5`:qL  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ :&qC<UD  
#if _MSC_VER > 1000 gO9'q='5l  
#pragma once L!?v BL  
#endif // _MSC_VER > 1000 2 ae w6~  
#ifndef __AFXWIN_H__ QN3 qF|))  
#error include 'stdafx.h' before including this file for PCH \)p4okpR  
#endif SQKi2\8w  
#include "resource.h" // main symbols <|B$dz?r  
class CHookApp : public CWinApp Tm%WWbc  
{ N/(ofy  
 public: Z(l9>A7!  
  CHookApp(); E7k-pquvE  
  // Overrides 5Ws5X_?d  
  // ClassWizard generated virtual function overrides o@Scz!"g  
  //{{AFX_VIRTUAL(CHookApp) ix(U:'{  
 public: Th.3j's  
  virtual BOOL InitInstance(); yB 1I53E  
  virtual int ExitInstance(); !?S5IGLOj  
  //}}AFX_VIRTUAL V[4(~,9  
  //{{AFX_MSG(CHookApp) KSF5)CZ5  
  // NOTE - the ClassWizard will add and remove member functions here. BN_!Y)F l  
  // DO NOT EDIT what you see in these blocks of generated code ! 5z9JhU  
  //}}AFX_MSG 5<!o{)I  
  DECLARE_MESSAGE_MAP() _'H2>V_  
}; ^6ExW>K  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); PG\\V$}A(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); OY+!aG@.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !}z%#$  
BOOL InitHotkey(); Z`^ K%P=  
BOOL UnInit(); & 8ccrw  
#endif Xs{/}wc.q;  
f:n]Exsy  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. qK<aZ%V  
#include "stdafx.h" FrgW7`s[A  
#include "hook.h" mipi]*ZfXE  
#include <windowsx.h> @QvfN>T  
#ifdef _DEBUG "ugX /r$_  
#define new DEBUG_NEW 5JO[+>  
#undef THIS_FILE zC<'fT/rG  
static char THIS_FILE[] = __FILE__; M|1eqR%x-?  
#endif jB*9 !xrd,  
#define MAX_KEY 100 5}<.1ab3V  
#define CTRLBIT 0x04 0Ei\VVK>  
#define ALTBIT 0x02 LBW.*PHW  
#define SHIFTBIT 0x01 c ,Qw;  
#pragma data_seg("shareddata") tVC@6Z$  
HHOOK hHook =NULL; }K#iCby4  
UINT nHookCount =0; Vww@eK%5Q  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey e@='Q H  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Z}]:x `fXd  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey pA*D/P-  
static int KeyCount =0; (k7;  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift EG'7}W  
#pragma data_seg() 9m<wcZ  
HINSTANCE hins; P}ehNt*($  
void VerifyWindow(); ~r(g|?}P  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) _bN))9 3  
//{{AFX_MSG_MAP(CHookApp) V`WI"HO+  
// NOTE - the ClassWizard will add and remove mapping macros here. gn-=##fT:i  
// DO NOT EDIT what you see in these blocks of generated code! (2\li{$e  
//}}AFX_MSG_MAP "r5'lQI  
END_MESSAGE_MAP() [{hLF9yPx  
NTXws4'D  
CHookApp::CHookApp() {Bav$kw;?e  
{ wJ;9),fL  
 // TODO: add construction code here, J`U$b+q6  
 // Place all significant initialization in InitInstance rU/-Wq`B  
} 4v rm&k  
#R~">g:w  
CHookApp theApp; S/#) :,YS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) MAsWds`bpB  
{ dbf^A1HI  
 BOOL bProcessed=FALSE; k+W  
 if(HC_ACTION==nCode) u!=]zW%  
 { >=.ch5h3J)  
  if((lParam&0xc0000000)==0xc0000000){// Key up @ef//G+Z"  
   switch(wParam) |N phG|  
   { ;`X`c  
    case VK_MENU: J>,'P^  
     MaskBits&=~ALTBIT; fY| @{]rx  
     break; v*vub#wP  
    case VK_CONTROL: , V0iMq  
     MaskBits&=~CTRLBIT; K8yWg\K  
     break; TMnT#ypf<5  
    case VK_SHIFT: umq$4}T '$  
     MaskBits&=~SHIFTBIT; &4ug3  
     break; !?tu! M<1?  
    default: //judge the key and send message }w|=c >'_}  
     break; AxG?zBTFx  
   } G#_(7X&  
   for(int index=0;index<MAX_KEY;index++){ :epitpJ  
    if(hCallWnd[index]==NULL) v.~Nv@+kR  
     continue; jgZX ~D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I1eb31<  
    { E 6>1Fm8%V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); g4BwKENM  
     bProcessed=TRUE; B1 jH.(  
    } C9"f6>i  
   } UgOGBj,&5W  
  } FvtM~[Q  
  else if((lParam&0xc000ffff)==1){ //Key down jk WBw.(  
   switch(wParam) K-g=td/@  
   { &;uGIk>s  
    case VK_MENU: A;/Xt  
     MaskBits|=ALTBIT; ;iwD/=Y  
     break; }RC. Q`b  
    case VK_CONTROL: >o=axZNa  
     MaskBits|=CTRLBIT; K4K3< Pg  
     break; ~@a) E+LsF  
    case VK_SHIFT: ( S C7m /  
     MaskBits|=SHIFTBIT; LiHXWi{s  
     break; N@%xLJF=N>  
    default: //judge the key and send message ]8q%bsl+  
     break; qqO10~Xc  
   }  K2vPj|  
   for(int index=0;index<MAX_KEY;index++) n]6w)wE (  
   { 1*eWvYo1  
    if(hCallWnd[index]==NULL) s525`Q;  
     continue; Hsux>+Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <7RkM  
    { K7d1(.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); lN]X2 4t  
     bProcessed=TRUE; 7\Yq]:;O  
    } 6P/9Vh j'  
   } v~W6yjp  
  } 1nX68fS.9  
  if(!bProcessed){ U`vt/#j 1  
   for(int index=0;index<MAX_KEY;index++){ :`!mCW`Q-  
    if(hCallWnd[index]==NULL) 9R t(G_'  
     continue; ua.6?W)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) H~1? MAX  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \C'I l w  
   } 16d{IGMz  
  } ' m# Ymp  
 } '&o> %V  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  ZeDDH  
} H]]>sE  
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BOOL InitHotkey() z<C~DH  
{ sjVl/t`l  
 if(hHook!=NULL){ 07HX5 Hd  
  nHookCount++; aV0;WH_3  
  return TRUE; v2dSC(hRZ  
 } $(<*pU  
 else -^SD6l$  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); s$=B~l  
  if(hHook!=NULL) B+e~k?O]1  
   nHookCount++; Lh5+fk~i~8  
  return (hHook!=NULL); l<+,(E=  
} <P Z\qE*+y  
BOOL UnInit() lf7H8k,-  
{ rO2PbF3  
 if(nHookCount>1){ tI(t%~>^  
  nHookCount--; r%?}5"*  
  return TRUE; 9"l%tq_  
 } 9i xnf=$Jp  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Zq6ebj  
 if(unhooked==TRUE){ @rDv (W  
  nHookCount=0; {UjIxV(J  
  hHook=NULL; N'1[t  
 } ,hcBiL/  
 return unhooked; ?)ZLxLV::  
} h: (l+jr  
kv`3Y0R-"  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) R|^t~h-  
{ VE+p&0  
 BOOL bAdded=FALSE; ohG43&g~  
 for(int index=0;index<MAX_KEY;index++){ i OA3x 8J  
  if(hCallWnd[index]==0){ v+, w{~7RH  
   hCallWnd[index]=hWnd; {gq:sj>  
   HotKey[index]=cKey; 8C4@V[sm`  
   HotKeyMask[index]=cMask; @zpHem dB  
   bAdded=TRUE; =?QQb>  
   KeyCount++; "nS{ ;:  
   break; vcUM]m8k   
  } -1Ki7|0,  
 } z@40 g)R2A  
 return bAdded; RI].LB_  
} Tr+Y@]"  
os0"haOI9h  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 'G By^hj?  
{ <GU(/S!}  
 BOOL bRemoved=FALSE; [_z2z6  
 for(int index=0;index<MAX_KEY;index++){ S&g -  
  if(hCallWnd[index]==hWnd){ P<w>1 =  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4iB)oR  
    hCallWnd[index]=NULL; 8*X L19N  
    HotKey[index]=0; d(cYtM,P  
    HotKeyMask[index]=0; )fcpE,g'  
    bRemoved=TRUE; [;\< 2=H  
    KeyCount--; r4qV}-E  
    break; ^*T{-U'  
   } B=qRZA!DQ?  
  } AF nl t  
 } LHGK!zI  
 return bRemoved; Xwqf Wd_  
}  7qdl,z  
"gVH;<&]  
void VerifyWindow() P xuz {  
{ N=}Z#  
 for(int i=0;i<MAX_KEY;i++){ R yIaT  
  if(hCallWnd!=NULL){ ;Z0cD*Jb  
   if(!IsWindow(hCallWnd)){ j-\^ }K.&  
    hCallWnd=NULL; vt7C  
    HotKey=0; :=fHPT  
    HotKeyMask=0; 2tTV5,(1  
    KeyCount--; yvnrZ&x :  
   } S| ?--vai_  
  } uaMm iR  
 } i_9/!D  
} [aVJYr2  
;bu;t#  
BOOL CHookApp::InitInstance() '48|f`8$  
{ eh# (}v  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); -cC(d$y  
 hins=AfxGetInstanceHandle(); olW`.3f  
 InitHotkey(); _p^ "!  
 return CWinApp::InitInstance(); w\[*_wQp  
} <. ]&FPJ  
*`/@[S2,cu  
int CHookApp::ExitInstance() )HiTYV)]'  
{ nWg)zj:  
 VerifyWindow(); GeR -k9  
 UnInit(); 9!<3qx/  
 return CWinApp::ExitInstance(); 3). c [F^l  
} IOsDVIXL\  
t ,Rn  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Nd!=3W5?  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ;-wPXXR  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ i]Of<eQ"  
#if _MSC_VER > 1000 Cl){sP=8W  
#pragma once Yl3PZ*#@ Q  
#endif // _MSC_VER > 1000 CF 0IP  
/-9+(  
class CCaptureDlg : public CDialog "PP0PL^5F  
{ {}2p1-(  
 // Construction k:yu2dQh  
 public: S~`AnX3!  
  BOOL bTray; z:? <aT  
  BOOL bRegistered; {dH<Un(4Z  
  BOOL RegisterHotkey(); Z4tq&^ :c=  
  UCHAR cKey; <J uJ`t  
  UCHAR cMask; 3S21DC@Y  
  void DeleteIcon(); xVo)!83+Q  
  void AddIcon(); [Cr~gd+ q  
  UINT nCount; ^qy-el  
  void SaveBmp(); _A~gqOe  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor E^ti !4{<  
  // Dialog Data \?I wR]@y  
  //{{AFX_DATA(CCaptureDlg) \X p"I5  
  enum { IDD = IDD_CAPTURE_DIALOG }; {N`<e>A]{  
  CComboBox m_Key; +=xRr?F  
  BOOL m_bControl; 69w"$V k  
  BOOL m_bAlt; [wxI X  
  BOOL m_bShift; ;'+cT.cmH  
  CString m_Path; L*Cf&c`8r  
  CString m_Number; qf{B  
  //}}AFX_DATA Z-V%lRQ=b  
  // ClassWizard generated virtual function overrides LR.+C xQ  
  //{{AFX_VIRTUAL(CCaptureDlg) )4C6+63OD&  
 public: - C]a2  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ~#Mx&mZ  
 protected: U~c;W@T  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xL"o)]a=  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Q2PwO;E.`C  
  //}}AFX_VIRTUAL 'Z9F0l"Nr  
  // Implementation Y3&ecEE  
 protected: F'Vl\qPt  
  HICON m_hIcon; sM_e_e  
  // Generated message map functions oVgNG!/c0  
  //{{AFX_MSG(CCaptureDlg) *a.*Ha  
  virtual BOOL OnInitDialog(); kV<)>Gs  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); X Y?@^  
  afx_msg void OnPaint(); Q*(C)/QW  
  afx_msg HCURSOR OnQueryDragIcon(); Rb*\A7o|;  
  virtual void OnCancel(); ':dHYvP/UX  
  afx_msg void OnAbout(); d8I:F9  
  afx_msg void OnBrowse(); ]jrxrUl  
  afx_msg void OnChange(); fL:Fn"Nv  
 //}}AFX_MSG BS.6d}G4  
 DECLARE_MESSAGE_MAP() nJ@hzK.  
}; {bEEQCweNJ  
#endif | Ylk`<  
ZJm^znpw6  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "xI[4~'`:  
#include "stdafx.h" +.uk#K0o  
#include "Capture.h" '1nU[,Wj  
#include "CaptureDlg.h" |Q;1;QXd  
#include <windowsx.h> T`;M!-)2  
#pragma comment(lib,"hook.lib") s]>%_(5  
#ifdef _DEBUG TD9`S SpP  
#define new DEBUG_NEW xUoY|$fI  
#undef THIS_FILE GjG3aqP&!  
static char THIS_FILE[] = __FILE__; (o\~2e:  
#endif )T_ #X!  
#define IDM_SHELL WM_USER+1 g{(nt5|^l  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x~^nlnKVf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); WGK::?  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; *RM'0[1F4  
class CAboutDlg : public CDialog Uc2#so$9  
{ Z;s-t\C  
 public: g&wQ^  
  CAboutDlg(); +.cv,1Vx  
  // Dialog Data |SleSgS<#  
  //{{AFX_DATA(CAboutDlg) i|GC 'XD@  
  enum { IDD = IDD_ABOUTBOX }; ARo5 Ss{  
  //}}AFX_DATA _%B`Y ?I`  
  // ClassWizard generated virtual function overrides b<7f:drVC  
  //{{AFX_VIRTUAL(CAboutDlg) ]42 l:at  
 protected: aoS1Yt'@  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @xE Q<g  
  //}}AFX_VIRTUAL J>35q'nN]F  
  // Implementation T(DE^E@a  
 protected: hrF4 a$  
  //{{AFX_MSG(CAboutDlg) w (1a{m?ht  
  //}}AFX_MSG q4oZJ-`  
  DECLARE_MESSAGE_MAP() ,,gYU_V  
}; !NjE5USi  
5c8x: e@  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Q!v[b{]8  
{ H2vEFnV  
 //{{AFX_DATA_INIT(CAboutDlg) o5uwa{v  
 //}}AFX_DATA_INIT 8),Y|4  
} TH &B9  
g~b'}^J  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6np wu5!  
{ a$m?if=  
 CDialog::DoDataExchange(pDX); %b9M\  
 //{{AFX_DATA_MAP(CAboutDlg) Viw3 /K  
 //}}AFX_DATA_MAP =KLYR UW  
} QZol( 2~Y  
,d#4Ib  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) cALs;)z  
 //{{AFX_MSG_MAP(CAboutDlg) %s>E@[s  
 // No message handlers +fN0> @s  
 //}}AFX_MSG_MAP KMZ`Wn=  
END_MESSAGE_MAP() rf@81Ds  
|*i-Q @ D  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) [qB=OxH?  
: CDialog(CCaptureDlg::IDD, pParent) @$]h[   
{ S8l+WF4q  
 //{{AFX_DATA_INIT(CCaptureDlg) f`e.c_n(  
  m_bControl = FALSE; >Mn.|:DF]&  
  m_bAlt = FALSE; R0[Gfq9M =  
  m_bShift = FALSE; ^Tx1y[hw$  
  m_Path = _T("c:\\"); Z/x~:u_  
  m_Number = _T("0 picture captured."); bkTj Q  
  nCount=0; Hw? J1#1IE  
  bRegistered=FALSE; >B0S5:S$W  
  bTray=FALSE; ??PpHB J')  
 //}}AFX_DATA_INIT it$~uP |  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 H'2 =yhtVh  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^E^:=Q?'_  
} $ }53f'QjW  
al/~  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 566EMy|  
{ -/X-.#}-  
 CDialog::DoDataExchange(pDX); 2ip~qZNw><  
 //{{AFX_DATA_MAP(CCaptureDlg) 0/$sr;  
  DDX_Control(pDX, IDC_KEY, m_Key); S%2qB;uw  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); UpILr\3U  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Eh+lL tZ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); vq}V0- <  
  DDX_Text(pDX, IDC_PATH, m_Path); ]CjODa  
  DDX_Text(pDX, IDC_NUMBER, m_Number); e]QkZg2?Yn  
 //}}AFX_DATA_MAP #~b9H05D  
} `m5iZxhw  
aO1cd_d6x_  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) gE1".qC  
//{{AFX_MSG_MAP(CCaptureDlg) y06 2/$*$  
 ON_WM_SYSCOMMAND() !k:j+h/  
 ON_WM_PAINT() /+u*9ZR&1  
 ON_WM_QUERYDRAGICON() 9YKEME+:  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) c1i7Rc{q  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) tyh%s"  
 ON_BN_CLICKED(ID_CHANGE, OnChange) TR|; /yJ  
//}}AFX_MSG_MAP l-&f81W  
END_MESSAGE_MAP() dU,/!|.K  
\ iFE,z  
BOOL CCaptureDlg::OnInitDialog() (ZYOm  
{ @cON"(  
 CDialog::OnInitDialog(); dZ*o H#B  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); LBg#KQ @  
 ASSERT(IDM_ABOUTBOX < 0xF000); )lbF'.i  
 CMenu* pSysMenu = GetSystemMenu(FALSE); pmC@ fB  
 if (pSysMenu != NULL) @azS)4L  
 { WKG=d]5  
  CString strAboutMenu; -}%zus5  
  strAboutMenu.LoadString(IDS_ABOUTBOX);  Po5}Vh  
  if (!strAboutMenu.IsEmpty()) bpkn[K"(  
  { 99 [ "I:  
   pSysMenu->AppendMenu(MF_SEPARATOR); ;$Y?j8g  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 7 ?Fl [FW$  
  } ;.Kzc3yz}  
 } +=R:n^r^,  
 SetIcon(m_hIcon, TRUE); // Set big icon gI]Vyg<{d  
 SetIcon(m_hIcon, FALSE); // Set small icon ~'ovJ46tx  
 m_Key.SetCurSel(0); 7Ny>W(8  
 RegisterHotkey(); Xe5J  
 CMenu* pMenu=GetSystemMenu(FALSE);  6?6 u  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); R~`Y6>o~9:  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); gVGq  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); G 6][@q  
 return TRUE; // return TRUE unless you set the focus to a control ;BqX=X+#  
} E$cr3 t7Xy  
&HWH UWB  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Y , P-@(  
{ ! `SR$dnE  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) B7#;tCf  
 { nJ,56}  
  CAboutDlg dlgAbout; Ac|`5'/Tx  
  dlgAbout.DoModal(); v#~,)-D&  
 } ^C(AMT  
 else _7Z$"  
 { t[<=QK  
  CDialog::OnSysCommand(nID, lParam); oR+Fn}mG  
 } txi m|)  
} !54%}x)3  
`]%{0 Rx  
void CCaptureDlg::OnPaint() @y,p-##e  
{ '!_o`t@  
 if (IsIconic()) uuq?0t2Z  
 { D!:Qy@Zw  
  CPaintDC dc(this); // device context for painting b c+' n  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); hJ|z8Sy@1  
  // Center icon in client rectangle TqWvHZX  
  int cxIcon = GetSystemMetrics(SM_CXICON); ag3T[}L z  
  int cyIcon = GetSystemMetrics(SM_CYICON); PgVM>_nHk  
  CRect rect; ar6Z?v$  
  GetClientRect(&rect); 3LEN~ N}  
  int x = (rect.Width() - cxIcon + 1) / 2; DU;]Q:r{  
  int y = (rect.Height() - cyIcon + 1) / 2; 8} U/fQ~  
  // Draw the icon ^0r @",  
  dc.DrawIcon(x, y, m_hIcon); e@6}?q;  
 } ;G w5gK^  
 else YXmLd'F^3  
 { f`?|A  
  CDialog::OnPaint(); U8moVj8w1  
 } 5f1yszd  
} zP5HTEz  
rIu>JyC"p  
HCURSOR CCaptureDlg::OnQueryDragIcon() o}[wu:>yk  
{ 1f}Dza9  
 return (HCURSOR) m_hIcon; &R 0BuFL8  
} QII>XJ9  
5 bgx;z9  
void CCaptureDlg::OnCancel() l!`m}$  
{ Q 5Ln'La$  
 if(bTray) d~.#KS  
  DeleteIcon(); A0'Yfuie  
  CDialog::OnCancel(); b+{yF  
} u!t'J+:  
^D!UF(H  
void CCaptureDlg::OnAbout() r> NgJf,  
{ HbCM{A9  
 CAboutDlg dlg; xNT[((  
 dlg.DoModal(); $[IuEdc/  
} IuRKj8J)o  
XrYz[h*)!  
void CCaptureDlg::OnBrowse() 6}[W%S]8  
{ (;!&RZ  
 CString str; yXl zImPn  
 BROWSEINFO bi; 'GAjx{gM  
 char name[MAX_PATH]; ,KZ_#9[>  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); X.g1 312~  
 bi.hwndOwner=GetSafeHwnd(); 0'a.Ypf  
 bi.pszDisplayName=name; {AJs pLcG  
 bi.lpszTitle="Select folder"; L> cTI2NB.  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; si)920?E&  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); \vKMNk;kz  
 if(idl==NULL) =T9QmEBm  
  return; PE3l2kr  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); mhh8<BI  
 str.ReleaseBuffer(); 92XzbbLp  
 m_Path=str; uQrD}%GI  
 if(str.GetAt(str.GetLength()-1)!='\\') P.LMu  
  m_Path+="\\"; nd-y`@z  
 UpdateData(FALSE); %|4Nmf$:Og  
} ?FD^S~bz-  
{]`O$S  
void CCaptureDlg::SaveBmp() $dq R]'  
{ e3&R3{  
 CDC dc; {5:y,=Y  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Qb/qUUQO;0  
 CBitmap bm; YMC*<wXN  
 int Width=GetSystemMetrics(SM_CXSCREEN); |]^OX$d  
 int Height=GetSystemMetrics(SM_CYSCREEN); 4h?[NOA"  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 9=Y-w s  
 CDC tdc; EZao\,t  
 tdc.CreateCompatibleDC(&dc); ~p^6  
 CBitmap*pOld=tdc.SelectObject(&bm); :+; U W \  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); |R DPx6!V  
 tdc.SelectObject(pOld); W$  M4#  
 BITMAP btm;  #\Lt0  
 bm.GetBitmap(&btm); sFMSH :5z  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Wcw$ Zv  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); /qEoiL###  
 BITMAPINFOHEADER bih; A@+pvC&  
 bih.biBitCount=btm.bmBitsPixel; .X TBy/(0  
 bih.biClrImportant=0; ?~hC.5  
 bih.biClrUsed=0; JuS#p5E #  
 bih.biCompression=0; <t&0[l  
 bih.biHeight=btm.bmHeight; )y_MI r  
 bih.biPlanes=1; zJOL\J'  
 bih.biSize=sizeof(BITMAPINFOHEADER); f8!*4Bw  
 bih.biSizeImage=size; b<NI6z8\  
 bih.biWidth=btm.bmWidth; ^ola5wD  
 bih.biXPelsPerMeter=0; k#&d`?X  
 bih.biYPelsPerMeter=0; wm !Y5  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); BH0].-)[y!  
 static int filecount=0; YR^J7b\  
 CString name; "I}3*s9Q-  
 name.Format("pict%04d.bmp",filecount++); {+!m]-s  
 name=m_Path+name; *CMe:a  
 BITMAPFILEHEADER bfh; ~+7q.XL$$K  
 bfh.bfReserved1=bfh.bfReserved2=0; 0DV .1  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 5_9mA4gs@  
 bfh.bfSize=54+size; ^,qi` Tk  
 bfh.bfOffBits=54; 7NE"+EP\{2  
 CFile bf; ZXh6Se4o  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ FY@ErA7~  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); UW_fn  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); V)=!pT  
  bf.WriteHuge(lpData,size); *xI0hFJIM  
  bf.Close(); GMyzQ]@}  
  nCount++; n3 -5`Jti  
 } V*"-@  
 GlobalFreePtr(lpData); :'|%~&J  
 if(nCount==1) F$F,I,$ "  
  m_Number.Format("%d picture captured.",nCount); ?I6!m~  
 else tI~.3+F  
  m_Number.Format("%d pictures captured.",nCount); 3o5aB1   
  UpdateData(FALSE); mfc\w'  
} 1/:WA:]1 ,  
ozy~`$;c  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) &A)AV<=>T  
{ fucG 9B  
 if(pMsg -> message == WM_KEYDOWN) Bq3"l%hI  
 { tN&4t xB  
  if(pMsg -> wParam == VK_ESCAPE) 7VduewKX8  
   return TRUE; >08'+\~:b  
  if(pMsg -> wParam == VK_RETURN) JTA65T{3  
   return TRUE; SfLZVB  
 } B+:/!_  
 return CDialog::PreTranslateMessage(pMsg); FL*qV"r^n  
} pyJY]"UHVE  
3|x*lmit  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) DybuLB$f  
{ eg!s[1[_  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ H0r@dn  
  SaveBmp(); jfF   
  return FALSE; P'MfuTtT&  
} N@6+DHt  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ k+b!Lw!L  
 CMenu pop; jkTC/9AE|  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); *oZ]k`-!8  
 CMenu*pMenu=pop.GetSubMenu(0); 0vR gmn  
 pMenu->SetDefaultItem(ID_EXITICON); c_wvuKa  
 CPoint pt; wX<w)@  
 GetCursorPos(&pt); xU<WUfS1  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ynY(  
 if(id==ID_EXITICON) )}w2'(!X8  
  DeleteIcon(); PgHe;^?j  
 else if(id==ID_EXIT) 5argw+2s4$  
  OnCancel(); tZ\e:AAi  
 return FALSE; 2[} O:  
} |z1er"zR)  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 89n\$7Ff9  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) &Z'3n9zl  
 AddIcon(); S7a05NO  
 return res; >V1vw7Pa  
} +guCTGD:  
3ScOJo  
void CCaptureDlg::AddIcon() ^I W5c>;|  
{ r)<c ~\0 7  
 NOTIFYICONDATA data; gOb"-;Zw  
 data.cbSize=sizeof(NOTIFYICONDATA); dmA#v:$1  
 CString tip; PzF>yG[  
 tip.LoadString(IDS_ICONTIP); jEhPx  
 data.hIcon=GetIcon(0); &FrUj>i  
 data.hWnd=GetSafeHwnd(); 1?I_fA}  
 strcpy(data.szTip,tip); YF8;s4  
 data.uCallbackMessage=IDM_SHELL; R|D%1@i]  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; *{y({J  
 data.uID=98; <tUl(q+ty  
 Shell_NotifyIcon(NIM_ADD,&data); z H|YVg  
 ShowWindow(SW_HIDE); (>]frlEU~  
 bTray=TRUE; xB4}9zN s  
} Wdk]>w 'L  
UA4="/  
void CCaptureDlg::DeleteIcon() V_\9t8  
{ POXd,ON9  
 NOTIFYICONDATA data; xQUskjv/  
 data.cbSize=sizeof(NOTIFYICONDATA); ^k J>4  
 data.hWnd=GetSafeHwnd(); ) KvGJo)("  
 data.uID=98; d!57`bVOd  
 Shell_NotifyIcon(NIM_DELETE,&data); &ci;0P#Q  
 ShowWindow(SW_SHOW); Q Uy7Q$W  
 SetForegroundWindow(); i8w/a  
 ShowWindow(SW_SHOWNORMAL); ~cv322N   
 bTray=FALSE; L`3;9rO  
} !(gMr1}w  
NJ^Bv`  
void CCaptureDlg::OnChange() _w}l,   
{ WU$l@:Yo  
 RegisterHotkey(); :MaP58dhh  
} y:',)f }  
<>v=jH|L  
BOOL CCaptureDlg::RegisterHotkey() $ U=j<^R}a  
{ l"zwH  
 UpdateData(); XgI;2Be+&a  
 UCHAR mask=0; 0ZM#..3sI  
 UCHAR key=0; !P8Y(i  
 if(m_bControl) ;{lb_du2:  
  mask|=4; E]O/'-  
 if(m_bAlt) t 7-6A  
  mask|=2; I3qTSX-  
 if(m_bShift) ;~,)6UX7  
  mask|=1; S:lie*Aux*  
  key=Key_Table[m_Key.GetCurSel()]; utu V'5GD  
 if(bRegistered){ gWD46+A){  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); A Xpg_JC  
  bRegistered=FALSE; .QU]  
 } U3**x5F_  
 cMask=mask; v? Zo5uVoq  
 cKey=key; m)l'i!Y  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); :y.~IQN  
 return bRegistered; Y 'y yrn}  
} Y(RB@+67  
&>f]  
  四、小结 %63s(ekU  
[a_'pAH  
  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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