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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: xSpC'"   
  fm1X1T.  
  一、实现方法 bm&87  
A,~Hlw  
  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: ]0c Pml  
IKvBf'%-  
#pragma data_seg("shareddata") ^c9ThV.v  
HHOOK hHook =NULL; //钩子句柄 `NwdbKX  
UINT nHookCount =0; //挂接的程序数目 juToO  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 (U.**9b;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Tc ZnmN  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey E(+T*  
static int KeyCount =0; )&W|QH=AI  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1  e/e0d<(1  
#pragma data_seg() dhRJg"vrQ  
7INk_2  
  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。 a ib}`l  
^[h2%c$  
  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: 2xmk,&s  
(0*v*kYdL+  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR nYv#4*  
cKey,UCHAR cMask) ]>:^d%n,}  
{ ;np_%?is  
 BOOL bAdded=FALSE; i%(yk#=V  
 for(int index=0;index<MAX_KEY;index++){ `rWB`q|i<  
  if(hCallWnd[index]==0){ SqB/4P   
   hCallWnd[index]=hWnd; $CtCOwKZ  
   HotKey[index]=cKey; GCE!$W  
   HotKeyMask[index]=cMask; 24@^{ }  
   bAdded=TRUE; Ph7pd  
   KeyCount++; d O A%F$Mk  
   break; _[E\=  
  } ;:#U 6?=t  
 } c]Unbm^w  
 return bAdded; {V2bU}5 [  
} !Cj(A"uqY  
//删除热键 #-x@"+z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) KvFR8s  
{ *d*oS7  
 BOOL bRemoved=FALSE; |i)lh_iN  
 for(int index=0;index<MAX_KEY;index++){ l[n@/%2  
  if(hCallWnd[index]==hWnd){ ^JhFI*  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ SR*Gqx  
    hCallWnd[index]=NULL; QJ4AL3 ^6  
    HotKey[index]=0; {Qtq7q.  
    HotKeyMask[index]=0; :k!j"@r  
    bRemoved=TRUE; i^%-aBZ  
    KeyCount--; eYP=T+  
    break; ]UUI~sFE  
   } dt-K  
  } QJ<[Zx  
 } (-(*XNC  
 return bRemoved; H/i<_LP  
} ]xq::a{Oy  
ko[TDh$T5  
cb+y9wA  
  DLL中的钩子函数如下: QaMDGD  
eOrYa3hQ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) QP\yaPE  
{ J~J@ ]5/  
 BOOL bProcessed=FALSE; N_vXYaY  
 if(HC_ACTION==nCode) )*[ ""&  
 { AUAI3K?  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 O<`R~  
   switch(wParam) &telCg:  
   {  _om[VKJd  
    case VK_MENU: [,7-w  
     MaskBits&=~ALTBIT; S[U/qO)m  
     break; D9^7m j?e  
    case VK_CONTROL: Z\!rH "8  
     MaskBits&=~CTRLBIT; #\b ;2>  
     break; agY5Dg7  
    case VK_SHIFT: [-VGArD[k,  
     MaskBits&=~SHIFTBIT; "|4jP za  
     break; E/"SU*Co  
    default: //judge the key and send message `` -k{C#F  
     break; ^g]xU1] *  
   } IxP^i{/1?  
   for(int index=0;index<MAX_KEY;index++){ v' 0!=r  
    if(hCallWnd[index]==NULL) :VFTVmr  
     continue; uYTCdZQh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #{>uC&jD  
    { F"BL #g66  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); :`zV [A:D  
     bProcessed=TRUE; G^KC&  
    } @^wpAQfd4  
   } 6F ;Or  
  } ,I39&;Iq  
  else if((lParam&0xc000ffff)==1){ //有键按下 N*1  
   switch(wParam) *tG11gR,&  
   { 0#=W#Jl>  
    case VK_MENU: %^')G+>i  
     MaskBits|=ALTBIT; _?Ckq  
     break; H XP;0B%4  
    case VK_CONTROL: c!~T2t  
     MaskBits|=CTRLBIT; e?vj+ZlS$f  
     break; b]K>vhQV  
    case VK_SHIFT: $`Rxn*}V4#  
     MaskBits|=SHIFTBIT; #7C6yXb%  
     break; V2QW\2@$  
    default: //judge the key and send message BvI 0v:  
     break; CXa Ld7nMX  
   } sy.:T]ZH  
   for(int index=0;index<MAX_KEY;index++){ cKpQr7]ur  
    if(hCallWnd[index]==NULL) 28+HKbgK  
     continue; @H4wHlb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z `@z  
    { 82 .HH5Z{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); EOQaY  
     bProcessed=TRUE; w 06gY  
    } Fo LDMx(  
   } '8={ sMy  
  } =SL^>HS.fo  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 S| "TP\o  
   for(int index=0;index<MAX_KEY;index++){ JilKZQmk  
    if(hCallWnd[index]==NULL) R25-/6_V>  
     continue; GDmv0V$6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5C65v:Q`N  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); UhBz<>i;!  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 'v+96b/;  
   } /=- h:0{M  
  } *cQz[S@F  
 } 'rh\CA/}D  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _0*=u$~R  
} ,L~snR'w  
'y eh7oR  
  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: aLHrl6"  
th9 0O|;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); y0y+%H-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); YZ{;%&rB  
d>~`j8,B  
  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: e~*S4dKR  
$WJy?_c  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) iI}nW  
{ 0O^U{#*$I  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) xT/9kM&}L  
 { 0*{@E%9  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 H<{*ub4'L*  
  SaveBmp(); @@; 1%z  
  return FALSE; 6iyt2q kh  
 } Jb 6&  
 …… //其它处理及默认处理 H'']J9O  
} Mi;Tn;3er  
LsnXS9_  
>7W"giWP  
  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。 2t.fD@  
.$OjUlzr-H  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 5 5a@)>h  
1k`|[l^  
  二、编程步骤  rA2qV  
7%X+O8  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; fA;x{0CAMX  
83X/"2-K  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 75PS^5T,  
oX2r?.j#M  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; KM EXT$p  
gMCy$+?  
  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; Us*Vn  
% ghJ*iHR  
  5、 添加代码,编译运行程序。 td%Y4-+-  
x[Hhj'  
三、程序代码 ;Xz(B4N~o  
$F<%Jl7_Z  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL qP@L(_=g  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) zab w!@]  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ %jpH:-8'2  
#if _MSC_VER > 1000 %OTQRe:  
#pragma once yM W'-\  
#endif // _MSC_VER > 1000 =:kiSrBS3t  
#ifndef __AFXWIN_H__ eO~eu]r  
#error include 'stdafx.h' before including this file for PCH D_zcOq9  
#endif OrzM hQaf  
#include "resource.h" // main symbols L/c4"f|.*v  
class CHookApp : public CWinApp 3KR2TcT#{  
{ |:{g?4Mi  
 public: m<~>&mWr  
  CHookApp(); 9$8X> T^   
  // Overrides $]xE$dzJ  
  // ClassWizard generated virtual function overrides ]U#JsMS  
  //{{AFX_VIRTUAL(CHookApp) 6_x}.bkIx=  
 public: p^}L  
  virtual BOOL InitInstance(); ^"PfDTyA  
  virtual int ExitInstance(); g6HphRJ5s  
  //}}AFX_VIRTUAL T,A!5V>cX  
  //{{AFX_MSG(CHookApp) ^V_ku@DY  
  // NOTE - the ClassWizard will add and remove member functions here. |)~Ex 9%ev  
  // DO NOT EDIT what you see in these blocks of generated code ! wbn^R'  
  //}}AFX_MSG ?]759,Q3L  
  DECLARE_MESSAGE_MAP() ;B,nzx(L  
}; ?=TL2"L  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); +!D=SnBGs  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); tuX =o  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `" i^'VL,  
BOOL InitHotkey(); z&\Il#'\m+  
BOOL UnInit(); uv?8V@x2  
#endif x;<oaT$X  
<|ka{=T  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. I3V{"Nx6  
#include "stdafx.h" c8 H9_6  
#include "hook.h" 2(@LRl>:  
#include <windowsx.h> [P(rY  
#ifdef _DEBUG 9(i0" hS^  
#define new DEBUG_NEW &Xj{:s#  
#undef THIS_FILE 5)h+(u C3  
static char THIS_FILE[] = __FILE__; \H},ou U  
#endif sDW"j\  
#define MAX_KEY 100 {Q}!NkF 1  
#define CTRLBIT 0x04 "FD<^  
#define ALTBIT 0x02 Krt$=:m|1  
#define SHIFTBIT 0x01 IptB.bYc  
#pragma data_seg("shareddata") ^\xCqVk_R  
HHOOK hHook =NULL; 3RBpbTNWp  
UINT nHookCount =0; N[- %0  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey $w 5#2Za  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 0[_O+u  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey jAD+:@  
static int KeyCount =0; m9\@kA  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ,<R>Hiwg/s  
#pragma data_seg() WRN8#b  
HINSTANCE hins; WsG"x>1n  
void VerifyWindow(); Fr938q6^-  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Uqb]e?@  
//{{AFX_MSG_MAP(CHookApp) g6x/f<2x  
// NOTE - the ClassWizard will add and remove mapping macros here. S,ouj;B  
// DO NOT EDIT what you see in these blocks of generated code! F(?Fz8  
//}}AFX_MSG_MAP (CKhY~,/u  
END_MESSAGE_MAP() Vu_7uSp,)  
(,d4"C  
CHookApp::CHookApp() v9X7-GJ~  
{ :mCw.Jz<h  
 // TODO: add construction code here, LZ=wz.'u  
 // Place all significant initialization in InitInstance uK+9gTv  
} iX0]g45o  
# CP9^R S  
CHookApp theApp; ~*,Ddwr0a  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) uD0(aqAZ  
{ DctX9U(  
 BOOL bProcessed=FALSE; x9FLr}e  
 if(HC_ACTION==nCode) "t3uW6&  
 { 'qD'PLV  
  if((lParam&0xc0000000)==0xc0000000){// Key up wR 5\^[GN  
   switch(wParam) U]`'GM/x  
   { `2 %eDFZ  
    case VK_MENU: ox i a}  
     MaskBits&=~ALTBIT; F)[XIY&2/  
     break; s0X/1Cq  
    case VK_CONTROL: HM(bR"E  
     MaskBits&=~CTRLBIT; -52 @%uB  
     break; TsFV ;Sl3  
    case VK_SHIFT: 0{^l2?mgSb  
     MaskBits&=~SHIFTBIT; L@d]RMNv  
     break; Q{ |+ 3!!'  
    default: //judge the key and send message -$sl!%HO%  
     break; e{q p!N1!  
   } +j)-L \  
   for(int index=0;index<MAX_KEY;index++){ 7$Z)fkx.  
    if(hCallWnd[index]==NULL) T2/v}  
     continue; 46Y7HTwE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) XC+F! R  
    { {y+v-v/#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #'G7mAoA  
     bProcessed=TRUE; 2yi*eR  
    } B J:E,P`_  
   } 2ZTyo7P  
  } #Of<1  
  else if((lParam&0xc000ffff)==1){ //Key down #2ZrdD"5kQ  
   switch(wParam) x`j$9XN5  
   { Eb4< 26A  
    case VK_MENU: b7>-aem@I  
     MaskBits|=ALTBIT;  HzgQI  
     break; YKs^%GO+  
    case VK_CONTROL: \pBYWf  
     MaskBits|=CTRLBIT; n##w[7B*  
     break; /jK17}j  
    case VK_SHIFT: ?h>%Ix  
     MaskBits|=SHIFTBIT; .5Z,SGBf  
     break; nkr,  
    default: //judge the key and send message OW[/%U>  
     break; kcma/d  
   } WL]Wu.k  
   for(int index=0;index<MAX_KEY;index++) 6bA~mC^&  
   { $z`cMQ r  
    if(hCallWnd[index]==NULL) eJVOVPg<,  
     continue; Z7KB?1{G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) SoM ]2^  
    { SzgY2+Qq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); V fE^g\Ia  
     bProcessed=TRUE; 3LmBV\["  
    } @4  
   } XSHwE)m  
  } )P(d66yq'u  
  if(!bProcessed){ c!(~BH3p  
   for(int index=0;index<MAX_KEY;index++){ {8>_,z^P)  
    if(hCallWnd[index]==NULL) U# FJ8CD&u  
     continue; f4aD0.K.g|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /%}YuN  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 7Da^Jv k  
   } Rm[rQ }:  
  } i+T0}M<  
 } kHo;9j-U  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); q9a wzj  
} ~; O= 7  
J~yd]L>  
BOOL InitHotkey() *fuGVA  
{ H pjIp.  
 if(hHook!=NULL){ =%nqMV(y  
  nHookCount++; CB{k;H  
  return TRUE; !z4Hj{A_  
 } a s<q  
 else Lu#@~  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); /K Jx n6  
  if(hHook!=NULL) yrK--C8  
   nHookCount++; t KqCy\-q  
  return (hHook!=NULL); Um0<I)  
} V;(*\"O  
BOOL UnInit() Jj^<:t5{rN  
{ +_|cZlQ&  
 if(nHookCount>1){ H$qdU!c  
  nHookCount--; [#3Cg%V  
  return TRUE; ~:RDw<PWp  
 } @u'27c_<d3  
 BOOL unhooked = UnhookWindowsHookEx(hHook); /iJcy:J  
 if(unhooked==TRUE){ ~M9 n<kmE  
  nHookCount=0; \SHD  
  hHook=NULL; KSpC%_LC  
 } exrt|A] _[  
 return unhooked; )1tnZ=&  
} ;6 &=]I  
Y$`hudJ&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) IG3K Pmu  
{ q NQ3(1xW  
 BOOL bAdded=FALSE; iHG:W wM&  
 for(int index=0;index<MAX_KEY;index++){ ^2?O+ =,F  
  if(hCallWnd[index]==0){ nLN6@  
   hCallWnd[index]=hWnd; qwq+?fj={  
   HotKey[index]=cKey; smLD m  
   HotKeyMask[index]=cMask; }RP9%n^  
   bAdded=TRUE; n-| i  
   KeyCount++; ]@<3 6ByM  
   break; |Nx!g fU  
  } K&a]pL6D  
 } {]_{BcK+  
 return bAdded; *mhw5Z=!  
} Uub%s`O  
g J[q {b  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 'r?HL;,q  
{ lt(-,md  
 BOOL bRemoved=FALSE; kk\zZC <  
 for(int index=0;index<MAX_KEY;index++){ 9Nbg@5(  
  if(hCallWnd[index]==hWnd){ TAXkfj  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (9[C0eS  
    hCallWnd[index]=NULL; G>{:D'#  
    HotKey[index]=0; p$!+2=)gY  
    HotKeyMask[index]=0; s? \9i6  
    bRemoved=TRUE; Ai_|)  
    KeyCount--; q!h*3mNm  
    break; 8!fAv$g0  
   } hu*>B  
  } %IH|zSr)EM  
 } ", Rw%_  
 return bRemoved; sT"tS>  
} D!E 9@*Lf  
+mQC:B7>  
void VerifyWindow() G`JwAy r'  
{ yLa5tv/  
 for(int i=0;i<MAX_KEY;i++){ "E[*rnsLN  
  if(hCallWnd!=NULL){ = ]HJa  
   if(!IsWindow(hCallWnd)){ ZzaW@6LJF  
    hCallWnd=NULL; '  ^L  
    HotKey=0; hw.demD  
    HotKeyMask=0; E?5B>Jer#  
    KeyCount--; ;NVTn<Uj  
   } wT AEJ{p  
  } f!kdcr=/"  
 } iqKfMoy5  
} Wes "t}[25  
SVEA  
BOOL CHookApp::InitInstance() lG^nT  
{ wNZS6JF.d  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); S$_Ts1Ge6  
 hins=AfxGetInstanceHandle(); -clg 'Aa;.  
 InitHotkey(); D2*Q1n  
 return CWinApp::InitInstance(); yD id` ym  
} X1PlW8pd  
hD.wKX?oO  
int CHookApp::ExitInstance() !rmo*-=^=  
{ T[9jTO?W2  
 VerifyWindow(); 2i'-lM=  
 UnInit(); btz3f9  
 return CWinApp::ExitInstance(); +O:pZz  
} +#"Ic:  
(V%vFD1)  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file X!HSS/'  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) v@1Jh ns  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Hw.@Le>  
#if _MSC_VER > 1000 `,]PM) iC  
#pragma once -#z'A  
#endif // _MSC_VER > 1000 q@yabuN@,j  
0JL6EL>_  
class CCaptureDlg : public CDialog <y/AEY1  
{ T1W9@9,s  
 // Construction vh.tk^&  
 public: "YU~QOGx@  
  BOOL bTray; ^9~%=k=  
  BOOL bRegistered; @9P9U`ZP  
  BOOL RegisterHotkey(); Y`p&*O  
  UCHAR cKey; ] Lft^,7  
  UCHAR cMask; y/*Tvb #TJ  
  void DeleteIcon(); =@/^1.`  
  void AddIcon(); T7nX8{l[RG  
  UINT nCount; u\Q**m2XP  
  void SaveBmp(); PsT v\!  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor bH]!~[  
  // Dialog Data C^v -&*v  
  //{{AFX_DATA(CCaptureDlg) _; RD-kv  
  enum { IDD = IDD_CAPTURE_DIALOG }; N28?JQha  
  CComboBox m_Key; `D4'`Or-U  
  BOOL m_bControl; mP+yjRw  
  BOOL m_bAlt; on&=%tCAL  
  BOOL m_bShift; *wyLX9{:  
  CString m_Path; 6? ly. h$  
  CString m_Number; #EK8Qe_  
  //}}AFX_DATA Mp}NUQHE  
  // ClassWizard generated virtual function overrides d(tf: @  
  //{{AFX_VIRTUAL(CCaptureDlg) PS;*N 8  
 public: dV*rnpN  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 3sIM7WD?  
 protected: jJC( (1|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JT_B@TO\  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 9uoj3Rh<  
  //}}AFX_VIRTUAL B>2 1A9&  
  // Implementation `r$WInsDu  
 protected: UoT}m^ G  
  HICON m_hIcon; ITPp T  
  // Generated message map functions SytDo (_=W  
  //{{AFX_MSG(CCaptureDlg) &Y2P!\\2  
  virtual BOOL OnInitDialog(); -zkL)<7  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ``CADiM:S  
  afx_msg void OnPaint(); -%$ dFq  
  afx_msg HCURSOR OnQueryDragIcon(); OvG|=  
  virtual void OnCancel(); wA&)y>n-  
  afx_msg void OnAbout(); Y\S^DJy  
  afx_msg void OnBrowse(); iFchD\E*o  
  afx_msg void OnChange(); UHHKI)(  
 //}}AFX_MSG k}qiIMdI  
 DECLARE_MESSAGE_MAP() hvZR4|k>  
}; CUcjJ|MZ  
#endif % E_{L  
@y&,e,3!  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file X}^gmu<Vla  
#include "stdafx.h" xM,(|p(  
#include "Capture.h" 1D DOUV  
#include "CaptureDlg.h" 8Y'"=!3  
#include <windowsx.h> cYS+XBz  
#pragma comment(lib,"hook.lib") eR;0pWVl  
#ifdef _DEBUG Jtk(yp{Zz  
#define new DEBUG_NEW /a)=B)NH  
#undef THIS_FILE N'.+ezZ;h  
static char THIS_FILE[] = __FILE__; |:BYOxAYZ8  
#endif j"8N)la  
#define IDM_SHELL WM_USER+1 izo $0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); jo#F&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Uwa1)Lwn  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; (j"MsCwE  
class CAboutDlg : public CDialog 5aQg^f%\  
{ yt,;^o^  
 public: fdHxrH >*  
  CAboutDlg(); y5h[^K3  
  // Dialog Data *&MkkI#  
  //{{AFX_DATA(CAboutDlg) LRs; >O  
  enum { IDD = IDD_ABOUTBOX }; >*CK@"o  
  //}}AFX_DATA F x8)jBB_  
  // ClassWizard generated virtual function overrides KK|Jach  
  //{{AFX_VIRTUAL(CAboutDlg) OUMr}~/  
 protected: >Sah\u`  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M lwQ_5O  
  //}}AFX_VIRTUAL h]9^bX__Z  
  // Implementation ^q2zqC  
 protected: ywte \}  
  //{{AFX_MSG(CAboutDlg) A[a+,TN {  
  //}}AFX_MSG P://Zi6>  
  DECLARE_MESSAGE_MAP() S45_-aE  
}; ,BAF?} 04=  
L,L7WObA  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @kymL8"2w  
{ v:;cTX=x`#  
 //{{AFX_DATA_INIT(CAboutDlg) P2F>iK#U  
 //}}AFX_DATA_INIT G$<0_0GF  
} Y.#+Yh[  
*h6i9V%'  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 0k [6  
{ nsk 6a  
 CDialog::DoDataExchange(pDX); R0'EoX  
 //{{AFX_DATA_MAP(CAboutDlg) m"]ys #  
 //}}AFX_DATA_MAP M+:wa@K l  
} t68RWzqiG[  
1fZ:^|\  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 1YL5 ![T  
 //{{AFX_MSG_MAP(CAboutDlg) bux-t3g7+  
 // No message handlers 8?XZF[D  
 //}}AFX_MSG_MAP k6S<46}h|  
END_MESSAGE_MAP() O?Tg`]EX  
? Y* PVx9Y  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) YZ@-0_Z  
: CDialog(CCaptureDlg::IDD, pParent) \f#ao<vQm  
{ [%kucGC7  
 //{{AFX_DATA_INIT(CCaptureDlg) _TF>c:m3  
  m_bControl = FALSE; Zlo,#q  
  m_bAlt = FALSE; gZv <_0N  
  m_bShift = FALSE; Hc9pWr "N  
  m_Path = _T("c:\\"); EVsZ:Ra^k  
  m_Number = _T("0 picture captured."); t;3.;  
  nCount=0; [DwB7l)O(  
  bRegistered=FALSE; g(k|"g`*  
  bTray=FALSE; RUKSGj_NJ  
 //}}AFX_DATA_INIT ^ EOjq  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 -&}E:zoe  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); OFv} jT  
} 566Qik w2  
lfP|+=^B  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ^cm^JyS)  
{ ri ~2t3gg  
 CDialog::DoDataExchange(pDX); IIkJ"Qg.  
 //{{AFX_DATA_MAP(CCaptureDlg) f'dI"o&^/d  
  DDX_Control(pDX, IDC_KEY, m_Key); flqTx)xE  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 5@ug1F&   
  DDX_Check(pDX, IDC_ALT, m_bAlt); wn&2-m*a  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); mZyTo/\0  
  DDX_Text(pDX, IDC_PATH, m_Path); .EO1{2=  
  DDX_Text(pDX, IDC_NUMBER, m_Number); L8ke*O$  
 //}}AFX_DATA_MAP q0wVV  
} T^_9R;  
D2bUSRrb  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) .&y1gh!=  
//{{AFX_MSG_MAP(CCaptureDlg) jLSZ#H  
 ON_WM_SYSCOMMAND() 0J~4  
 ON_WM_PAINT() ~@JC1+  
 ON_WM_QUERYDRAGICON() <h({+N  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) L%FL{G  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) hr5)$qZW  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 43XuQg4  
//}}AFX_MSG_MAP ^ dqEOW  
END_MESSAGE_MAP() 7_,gAE:kG  
[@6iStRg7  
BOOL CCaptureDlg::OnInitDialog() }^muAr  
{ z{\.3G  
 CDialog::OnInitDialog(); jxvVp*-=<j  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); nP^$p C  
 ASSERT(IDM_ABOUTBOX < 0xF000); HdM;c*K  
 CMenu* pSysMenu = GetSystemMenu(FALSE); tANG ]  
 if (pSysMenu != NULL) 32yNEP{  
 { eORt qX8*  
  CString strAboutMenu; _q 8m$4  
  strAboutMenu.LoadString(IDS_ABOUTBOX); K@m^QioMj  
  if (!strAboutMenu.IsEmpty()) N"TD$NrK\  
  { '#PT C,0UJ  
   pSysMenu->AppendMenu(MF_SEPARATOR); uZ+<  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); zlfm})+G  
  } 1*fA>v  
 } RulIzv  
 SetIcon(m_hIcon, TRUE); // Set big icon &,zeBFmc  
 SetIcon(m_hIcon, FALSE); // Set small icon \!r^6'A   
 m_Key.SetCurSel(0); c+JlM1p@  
 RegisterHotkey(); `;;!>rm  
 CMenu* pMenu=GetSystemMenu(FALSE); - g0>>{M'  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Z>l>@wNm  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ]G:xTv8  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); <mN3:G  
 return TRUE; // return TRUE unless you set the focus to a control iX=*qiVX  
} Qxwe,:  
5WUrRQ?E  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) C7{wI`~  
{ x+pFu5,  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Ero3A'f  
 { wrbDbp1L  
  CAboutDlg dlgAbout; (rJvE*  
  dlgAbout.DoModal(); Gkl#s7'  
 } Ot?rsr  
 else 7u zN/LAF  
 { xk/(| f{L  
  CDialog::OnSysCommand(nID, lParam); > L%%B-  
 } DxlX-  
} U&6f}=v C  
:|a[6Uwl\V  
void CCaptureDlg::OnPaint() ydt1ED0Q-  
{ QUt!fF@t  
 if (IsIconic()) 157X0&EX  
 { ZU`"^FQ3A  
  CPaintDC dc(this); // device context for painting W>~V?%F&'  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); X\;y;pmRH  
  // Center icon in client rectangle P.o W#Je  
  int cxIcon = GetSystemMetrics(SM_CXICON); mS0W@#|K  
  int cyIcon = GetSystemMetrics(SM_CYICON); Wh,kJis<  
  CRect rect; @9-qqU@  
  GetClientRect(&rect); 4t":WutC  
  int x = (rect.Width() - cxIcon + 1) / 2; 1 !sYd@iD@  
  int y = (rect.Height() - cyIcon + 1) / 2; "P6MLf1  
  // Draw the icon /=N`P &R#  
  dc.DrawIcon(x, y, m_hIcon); ,0~=9dR  
 } y.zW>Mfl  
 else { }z7N~  
 { r* U6govky  
  CDialog::OnPaint(); Z1Wra-g  
 } B4kIcHA  
} O'k"6sBb  
b#sO1MXv  
HCURSOR CCaptureDlg::OnQueryDragIcon()  ZM"t.  
{ OHU(?TBo  
 return (HCURSOR) m_hIcon; >a<;)K^1  
} \?j(U8mB>  
*d=pK*g  
void CCaptureDlg::OnCancel() u>BR WN  
{ %vW@_A~  
 if(bTray) VD4(  
  DeleteIcon(); x-[l`k.V  
  CDialog::OnCancel(); m`/OO;/;  
} s SDBl~g  
0:XmReO+k  
void CCaptureDlg::OnAbout() 6Pz\6DU,I  
{ d$!ibL#o  
 CAboutDlg dlg; y=t -/*K  
 dlg.DoModal(); ~%]+5^Ka]  
} O_ ~\$b  
v"`w'+  
void CCaptureDlg::OnBrowse() sS._N@f  
{ 7*sB"_U2  
 CString str; Qi9SN00F.  
 BROWSEINFO bi; RW'QU`N[Y  
 char name[MAX_PATH]; zR%#Q_  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); JH 8^ZP:d'  
 bi.hwndOwner=GetSafeHwnd(); r;-\z(h  
 bi.pszDisplayName=name; @ Fu|et  
 bi.lpszTitle="Select folder"; #(%6urd  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; jN'zNOV~  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~!I \{(  
 if(idl==NULL) Z',pQ{rD  
  return; 7>#74oy  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 7Xa Ri@uG  
 str.ReleaseBuffer(); 7z}NI,R}1  
 m_Path=str; .mMM]*e[0  
 if(str.GetAt(str.GetLength()-1)!='\\') Hg]r5Fe/c  
  m_Path+="\\"; !(/dbHB  
 UpdateData(FALSE); \Q]7Hw<  
} N*eZ4s'  
DUaj]V{_^  
void CCaptureDlg::SaveBmp() L9T|*?||  
{ _s^sZ{'2_  
 CDC dc; 'h$1vT  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ig6F!p  
 CBitmap bm; bYiaJ  
 int Width=GetSystemMetrics(SM_CXSCREEN); `On%1%k8  
 int Height=GetSystemMetrics(SM_CYSCREEN); :V&#Oo  
 bm.CreateCompatibleBitmap(&dc,Width,Height); cf96z|^C  
 CDC tdc; J=  T!  
 tdc.CreateCompatibleDC(&dc); {Wt=NI?Ow  
 CBitmap*pOld=tdc.SelectObject(&bm); flRok?iF  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Gx!Y 4Q}-  
 tdc.SelectObject(pOld); o<Q~pd#Ip,  
 BITMAP btm; Wh,p$|vL  
 bm.GetBitmap(&btm); HZ/e^"cpM  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; KrB"2e+J  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); uZCPxog  
 BITMAPINFOHEADER bih; L+&$/1h]  
 bih.biBitCount=btm.bmBitsPixel; zpJQ7hym  
 bih.biClrImportant=0; Zv-#v  
 bih.biClrUsed=0; q.*k J/L  
 bih.biCompression=0; (<|,LagTuc  
 bih.biHeight=btm.bmHeight; 3:s!0ty"  
 bih.biPlanes=1; G22u+ua  
 bih.biSize=sizeof(BITMAPINFOHEADER); 'vBuQinn  
 bih.biSizeImage=size; o^mW`g8[  
 bih.biWidth=btm.bmWidth; n}EH{k9#  
 bih.biXPelsPerMeter=0; A\LMmg  
 bih.biYPelsPerMeter=0; Q/I/>6M7UZ  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); H>% K}Fh  
 static int filecount=0; Pa+%H]vB  
 CString name; l4RZ!K*X_"  
 name.Format("pict%04d.bmp",filecount++); cJMp`DQzc  
 name=m_Path+name; Nzf tc  
 BITMAPFILEHEADER bfh; ) }(Po_  
 bfh.bfReserved1=bfh.bfReserved2=0; m;'ebkq  
 bfh.bfType=((WORD)('M'<< 8)|'B'); w=,bF$:fIW  
 bfh.bfSize=54+size; S/V%<<[>p]  
 bfh.bfOffBits=54; 1GE[*$vuq  
 CFile bf; =XVw{\#9 b  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ + JsMYv  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); tw,uV)xm  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); zt6GJ z1q  
  bf.WriteHuge(lpData,size); Kqm2TMO]>V  
  bf.Close(); y2KR^/LN|Y  
  nCount++; 7*.nd  
 } :>f}rq  
 GlobalFreePtr(lpData); /@ m]@  
 if(nCount==1) -V7dSi  
  m_Number.Format("%d picture captured.",nCount); >4 VN1 ^  
 else 8u6*;*o  
  m_Number.Format("%d pictures captured.",nCount); G0)}?5L1J  
  UpdateData(FALSE); ;0FfP  
} 4}`z^P<C  
Qhy!:\&1  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5<YV`T{5Kl  
{ yvv]iRk<  
 if(pMsg -> message == WM_KEYDOWN) O |!cPB:  
 { yw\Q>~$n[=  
  if(pMsg -> wParam == VK_ESCAPE) {OIB/  
   return TRUE; =bgWUu\F  
  if(pMsg -> wParam == VK_RETURN) kntYj}F(  
   return TRUE; W[/Txc0$  
 } qz95)  
 return CDialog::PreTranslateMessage(pMsg); 0~4Ww=#  
} E6XDn`:  
k'QI`@l&l  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @q]4]U)  
{ 6+!$x?5|NP  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ -!q^/ux  
  SaveBmp(); TXdo,DPv7  
  return FALSE; {.eo?dQ  
} *O_>3Hgl  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ >jz9o9?8  
 CMenu pop; xu\s2x$  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); w$iQ,--  
 CMenu*pMenu=pop.GetSubMenu(0); R#HVrzOO|T  
 pMenu->SetDefaultItem(ID_EXITICON); ^p)#;$6b  
 CPoint pt; 8wV`mdKN  
 GetCursorPos(&pt); 'h R0JXy  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); GHY+q{'#V_  
 if(id==ID_EXITICON) ZmI0|r}QbY  
  DeleteIcon(); f*}}Az.4  
 else if(id==ID_EXIT) DQ<4`wEM  
  OnCancel(); nr&bpA/  
 return FALSE; ijP `fM8  
} .exBU1Yk@  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ?zex]!R  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) >$,P )cB'  
 AddIcon(); .dI".L  
 return res; #lR-?Uh  
} oz:"w nX  
#/_{(P  
void CCaptureDlg::AddIcon() 't6l@ _x  
{ ZLP/&`>8  
 NOTIFYICONDATA data; gFqF&t  
 data.cbSize=sizeof(NOTIFYICONDATA); #N"m[$;QR  
 CString tip; $GP66Ev  
 tip.LoadString(IDS_ICONTIP); /k8I6  
 data.hIcon=GetIcon(0); <?s@-mpgN  
 data.hWnd=GetSafeHwnd(); {xx}xib3  
 strcpy(data.szTip,tip); "}MP{/  
 data.uCallbackMessage=IDM_SHELL; {]2^b)  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; eAmI~oku  
 data.uID=98; Om^(CAp  
 Shell_NotifyIcon(NIM_ADD,&data); &(oA/jFQ  
 ShowWindow(SW_HIDE); T*:w1*:  
 bTray=TRUE; ! c`&L_ "!  
} ; [G:  
Q3Pu<j}Y  
void CCaptureDlg::DeleteIcon() URceq2_  
{ yDfH`]i)U  
 NOTIFYICONDATA data; ?7}ybw3t]  
 data.cbSize=sizeof(NOTIFYICONDATA); D=Q.Q  
 data.hWnd=GetSafeHwnd(); >$7x]f  
 data.uID=98; hr;^.a^  
 Shell_NotifyIcon(NIM_DELETE,&data); ;plBo%EBV  
 ShowWindow(SW_SHOW); ![;={d0  
 SetForegroundWindow(); M6mgJonN|  
 ShowWindow(SW_SHOWNORMAL); f"RC(("6W  
 bTray=FALSE; r4pX4 7H  
} d(|q&b:  
q8_(P&  
void CCaptureDlg::OnChange() ynv{ rMl  
{ 3_<l`6^Ns/  
 RegisterHotkey(); ").gPmC  
} $33E-^  
 $TfB72  
BOOL CCaptureDlg::RegisterHotkey() qCg<g  
{ u$ yXuFj/  
 UpdateData(); Vbt!, 2_)  
 UCHAR mask=0; ^R=`<jx   
 UCHAR key=0; ;89kL]  
 if(m_bControl) 8T1zL.u>q  
  mask|=4; VcGl8~#9  
 if(m_bAlt) >ei~:z]R  
  mask|=2; >MJ#|vO  
 if(m_bShift) E447'aJ  
  mask|=1; ?TeozhUY  
  key=Key_Table[m_Key.GetCurSel()]; ulxfxfd  
 if(bRegistered){ WW+xU0  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); -=nk,cYn  
  bRegistered=FALSE; u"q5 6}Q?]  
 } &nDXn|  
 cMask=mask; a M9v  
 cKey=key; u8T@W}FX  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); uLafO=Q  
 return bRegistered; w%.hALN5-C  
} (IBT|K  
XjF@kQeM=  
  四、小结 j1KNgAo<4  
=B9-}]DDO  
  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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