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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: TM"i9a? ;  
  jOe %_R  
  一、实现方法 d$>1 2>>  
"r|O /   
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: Et7AAV*8g  
r_ o2d8  
#pragma data_seg("shareddata") QALMF rWH  
HHOOK hHook =NULL; //钩子句柄 air{1="<-  
UINT nHookCount =0; //挂接的程序数目 +]AE}UXZoh  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 [NJ!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ]%G[<zD,1  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey <udp:s3#T  
static int KeyCount =0; ~D 5'O^  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 tpA7"JD  
#pragma data_seg() kvryDM  
d(R3![:  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 V .$<  
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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: !t[X/iu  
Qp%kX@Z'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR oDA1#-  
cKey,UCHAR cMask) <A+Yo3|7  
{ `W{Ye=|[d#  
 BOOL bAdded=FALSE; qH"e: wgL  
 for(int index=0;index<MAX_KEY;index++){ @;Yb6&I;  
  if(hCallWnd[index]==0){ Mx[tE?!2  
   hCallWnd[index]=hWnd; DKYrh-MN  
   HotKey[index]=cKey; fE7[Sk  
   HotKeyMask[index]=cMask; eEupqOF*:W  
   bAdded=TRUE; dIMs{!  
   KeyCount++; N',]WZ}  
   break; p4|:u[:&  
  } P4ot, Q4  
 } 42 8kC,  
 return bAdded; sd.:PE <  
} rOH8W  
//删除热键 O*!+D-  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) j {S\X'?  
{ ,,b_x@y*  
 BOOL bRemoved=FALSE; J'Gn M?M  
 for(int index=0;index<MAX_KEY;index++){ lvcX}{>\  
  if(hCallWnd[index]==hWnd){ 0 UjT<t^F  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ d v"  
    hCallWnd[index]=NULL; ?OlYJ/!z3  
    HotKey[index]=0; HI)ks~E/  
    HotKeyMask[index]=0; nBZqhtr  
    bRemoved=TRUE; &2#<6=}  
    KeyCount--; !j( v-pQf"  
    break; w%j 6zsTz  
   } //f[%j*>  
  } 9:4P7  
 } \Qz>us=G  
 return bRemoved; + ECV|mkk  
} N{ ;{<C9Z  
% UY=VE\F  
C5 ^_R  
  DLL中的钩子函数如下: :n{rVn}G  
.lTU[(qwu  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) '+Ts IJh  
{ ,k+jx53XV  
 BOOL bProcessed=FALSE; FL"IPX;S  
 if(HC_ACTION==nCode) dV.)+X7<  
 { h$4V5V  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 rOS fDv  
   switch(wParam) boJQ3Xc  
   {  ,|?B5n&  
    case VK_MENU: c{s<W}3Ds  
     MaskBits&=~ALTBIT; `Nc3I\tCM  
     break; N{L]H _=  
    case VK_CONTROL: $1#|<|  
     MaskBits&=~CTRLBIT; 64o`7  
     break; ~)Ny8Dh  
    case VK_SHIFT: A\.k['!  
     MaskBits&=~SHIFTBIT; "JbFbcj  
     break; _OHz6ag  
    default: //judge the key and send message pi3Z)YcT  
     break; 6@; w%Ea  
   } ~u/Enl7\-  
   for(int index=0;index<MAX_KEY;index++){ laKMQLtv  
    if(hCallWnd[index]==NULL) /,$6`V  
     continue; =DG aK0n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h:Npi `y  
    { IgR_p7['.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); bXC;6xZV  
     bProcessed=TRUE; ]%"Z[R   
    } ([`-*Hy  
   } C(7LwV  
  } v=iz*2+X  
  else if((lParam&0xc000ffff)==1){ //有键按下 Y&]pC  
   switch(wParam) 6TlkPM$~2  
   { /vwGSuk._  
    case VK_MENU: a:H}c9 $%  
     MaskBits|=ALTBIT; 4}LGE>  
     break; 3 3s.p'  
    case VK_CONTROL: >eWHPO  
     MaskBits|=CTRLBIT; ?N&"WL^|  
     break; =DcKHL(m  
    case VK_SHIFT: {SCwi;m  
     MaskBits|=SHIFTBIT; ~?+Jt3?,  
     break; yngSD`b_P  
    default: //judge the key and send message rM_8piD  
     break; f:=q=i  
   } 7?Xfge%\  
   for(int index=0;index<MAX_KEY;index++){ "otP^X.  
    if(hCallWnd[index]==NULL) vAHJP$x  
     continue; pU<->d;->  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y]^[|e8  
    { "&77`R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~~&8I!r e  
     bProcessed=TRUE; h9 [ov)  
    } Pdrz lu   
   } G'#a&6  
  } W5HC7o\4  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 s)8g4Yc*  
   for(int index=0;index<MAX_KEY;index++){ 83OOM;'  
    if(hCallWnd[index]==NULL) yLipuMNV  
     continue; sj0Hv d9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) U43PHcv_  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); mst-:F[h  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 xpRQ"6  
   } qIuY2b`6  
  } "N D1$l  
 } M,3sK!`>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); m7cp0+Peo  
} xCiY jl$  
l" *zr ;#  
  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: = 0Z}s  
A)/_:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); mj{TqF  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,4)zn6tC  
!J3g,p*  
  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: diaLw  
z|<6y~5,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) > CZ|Vx  
{ [59_n{S 1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) N0vr>e`  
 { )xoIH{  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 a>ZV'~zTf  
  SaveBmp(); "6FZX~]s!  
  return FALSE; =NQDxt}  
 } l> W?XH  
 …… //其它处理及默认处理 [K9l>O  
} }[ld=9p(  
x32hO;  
qm{(.b^  
  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。 to|O]h2*U2  
[?Cv^t${+  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 [h {zT)[  
:54ik,l  
  二、编程步骤 @aAB#,  
3-`IMN n!  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; gp`$/ci  
J NPEyC  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; |k\4\a Lj  
04D>h0yFf  
  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; )+OI}  
;}@.E@s%'  
  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; nQy.?*X  
=8?y$WE  
  5、 添加代码,编译运行程序。 !ow:P8K?  
lm i,P-Q  
三、程序代码 m9o{y6_j*  
W8z4<o[$  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL >E;kM B  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) <2"'R(4",  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ MKf|(6;~  
#if _MSC_VER > 1000  Fku~'30  
#pragma once zo6|1xq   
#endif // _MSC_VER > 1000 /99S<U2ej  
#ifndef __AFXWIN_H__ ?<)4_  
#error include 'stdafx.h' before including this file for PCH rofj&{w  
#endif n("Xa#mY[  
#include "resource.h" // main symbols b 5<&hN4g  
class CHookApp : public CWinApp JZI)jIh  
{ P{fT5K|  
 public: Ne#FBRu5  
  CHookApp(); >Q3_-yY+  
  // Overrides )O\w'|$G  
  // ClassWizard generated virtual function overrides @6h ,#8#  
  //{{AFX_VIRTUAL(CHookApp) C@d*t?  
 public: ~tx|C3A`d  
  virtual BOOL InitInstance(); )Q= EmZbJz  
  virtual int ExitInstance(); iZY4+ X  
  //}}AFX_VIRTUAL \A7{kI  
  //{{AFX_MSG(CHookApp) ;E:vsVK  
  // NOTE - the ClassWizard will add and remove member functions here. kb3>q($  
  // DO NOT EDIT what you see in these blocks of generated code ! uDD{O~wF,  
  //}}AFX_MSG ]Q0m]OaT  
  DECLARE_MESSAGE_MAP() :j^IXZW  
}; 2iM]t&^<+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); " GRR,7A  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); wN NXUW  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); B|d-3\sn  
BOOL InitHotkey(); e~oh%l^C72  
BOOL UnInit(); Ey|{yUmU+  
#endif X* 4C?v  
`]~1pc  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. dCA| )  
#include "stdafx.h" ^AhV1rBB  
#include "hook.h" x{DTVa 6y2  
#include <windowsx.h> s>J\h  
#ifdef _DEBUG ^_\S)P2c  
#define new DEBUG_NEW >0F)^W?  
#undef THIS_FILE M.FY4~  
static char THIS_FILE[] = __FILE__; ca=sc[ $+  
#endif AQ%B&Q(V1  
#define MAX_KEY 100 [~NJf3c"  
#define CTRLBIT 0x04 ycq+C8J+Ep  
#define ALTBIT 0x02 0<i8 ;2KD  
#define SHIFTBIT 0x01 L|hELWru  
#pragma data_seg("shareddata") k3(q!~a:.}  
HHOOK hHook =NULL; 2# 72B  
UINT nHookCount =0; jOUM+QO  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey e&@;hDmIX  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ^F)t>K$0m  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey A"tE~m;"7  
static int KeyCount =0; *@I/TX'\rY  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift *{:Zdg'~E  
#pragma data_seg() k"3@ G?JY  
HINSTANCE hins; 0Q7|2{  
void VerifyWindow(); |LV}kG(2  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ~6A;H$dr  
//{{AFX_MSG_MAP(CHookApp) E3LEeXcLS  
// NOTE - the ClassWizard will add and remove mapping macros here. ]z O6ESH  
// DO NOT EDIT what you see in these blocks of generated code! 2c*w{\X  
//}}AFX_MSG_MAP iE0x7x P_  
END_MESSAGE_MAP() dVMduo  
!'eh@BU;  
CHookApp::CHookApp() 1%$t;R  
{ {uDH-b(R  
 // TODO: add construction code here, IG.!M@_  
 // Place all significant initialization in InitInstance |(<A)C  
} ){LU>MW{&  
DHg)]FQ/  
CHookApp theApp; b_&:tE--]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Cxd^i  
{ i>7]9gBm1q  
 BOOL bProcessed=FALSE; I`77[  
 if(HC_ACTION==nCode) NR,R.N^[  
 { NQxx_3*4O  
  if((lParam&0xc0000000)==0xc0000000){// Key up \kZ@2.pN  
   switch(wParam) qZdA%  
   { \_(|$Dhq  
    case VK_MENU: 6u'E}hAx|  
     MaskBits&=~ALTBIT; d]USk&8  
     break; OI_Px3) y  
    case VK_CONTROL: 5yyc 0UG  
     MaskBits&=~CTRLBIT; .,sbqL  
     break; Wf3{z D~  
    case VK_SHIFT: ^-L nO%h?  
     MaskBits&=~SHIFTBIT; $O&N  
     break; :IX,mDO  
    default: //judge the key and send message ^RE[5h6^q  
     break; Q/@ pcU  
   } ^6gEL~m|]  
   for(int index=0;index<MAX_KEY;index++){ d}aMdIF!e  
    if(hCallWnd[index]==NULL) {Mb2X^@7  
     continue; `,O"^zR)z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'C=(?H)M  
    { qpQiMiB#g'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Rh!m1Q(-  
     bProcessed=TRUE; TS`m&N{i")  
    } !3<b#QAXRG  
   } .+mP#<mAg  
  } j<QK1d17  
  else if((lParam&0xc000ffff)==1){ //Key down F >H\F@Wl  
   switch(wParam) l9]nrT1Hy  
   { R_9M-RP6*  
    case VK_MENU: r:PYAb=g  
     MaskBits|=ALTBIT; \PD%=~  
     break; ~]24">VZf  
    case VK_CONTROL: E@%1HO_  
     MaskBits|=CTRLBIT; vTo+jQs^  
     break; 7yJE+o'  
    case VK_SHIFT: |'lNR)5  
     MaskBits|=SHIFTBIT; :`K2?;DC8  
     break; KzX)6 |g{"  
    default: //judge the key and send message Q@|"xKa  
     break; ~Y{]yBGoF  
   } nVrV6w  
   for(int index=0;index<MAX_KEY;index++) m^zD']  
   { -]-0]*oAp  
    if(hCallWnd[index]==NULL) FRL;fF  
     continue; c (29JZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^$mCF%e8H  
    { I?nU+t;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Q-A_8  
     bProcessed=TRUE; O$x +>^  
    } C^LxJG{L5  
   } E:O/=cT  
  } p.<d+S<  
  if(!bProcessed){ _v 8u%  
   for(int index=0;index<MAX_KEY;index++){ Hq~SRc~  
    if(hCallWnd[index]==NULL) Ki1 zi~  
     continue; <IBUl}|\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Ted tmX$  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); cp"{W-Q{$  
   } -;;m/QM  
  }  %{UW!/  
 } |MN2v[y  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 1vAJ(O{-  
} +;)Xu}  
KZ1m 2R}'  
BOOL InitHotkey() ?!$Dr0r  
{ D><^7nr%  
 if(hHook!=NULL){ a2]>R<M  
  nHookCount++; !HtW~8|:  
  return TRUE; dj4a)p|YN  
 } KU Mk:5 c  
 else l)~$/#k  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); I.>8p]X  
  if(hHook!=NULL) +QOK]NJN  
   nHookCount++; sk_xQo#Y 3  
  return (hHook!=NULL); =s*4y$%I  
} Lo Y*,Aa&  
BOOL UnInit() +.rE|)BPy  
{ LF)wn -C}  
 if(nHookCount>1){ }7K~-  
  nHookCount--; G8MLg#  
  return TRUE; ]l3Y=Cl  
 } $"}[\>e*{  
 BOOL unhooked = UnhookWindowsHookEx(hHook); g $^Yv4  
 if(unhooked==TRUE){ Q~n%c7  
  nHookCount=0; #;+SAoN  
  hHook=NULL; Q. '2 v%i  
 } I"Q U{]|J  
 return unhooked; 6\v4#  
} 16nU`TN  
/ %F,  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k9NHdi7&2  
{ ytb1hFs  
 BOOL bAdded=FALSE; i=hA. y`  
 for(int index=0;index<MAX_KEY;index++){ MUCes3YJH  
  if(hCallWnd[index]==0){ '$ z@40u  
   hCallWnd[index]=hWnd; Z Y5Pf 1  
   HotKey[index]=cKey; 7 9k+R9m  
   HotKeyMask[index]=cMask; +1\t 0P24  
   bAdded=TRUE; )jjaY1E  
   KeyCount++; j0n.+CO-{  
   break; u@`y/,PX  
  } /YvwQ  
 } l%?()]y  
 return bAdded; *Uf>Xr&  
} m%.[|sZ3EM  
rZ.z!10  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ; 0M"T[c  
{ N| P?!G-=  
 BOOL bRemoved=FALSE; n;:C{5  
 for(int index=0;index<MAX_KEY;index++){ ~LP5hL  
  if(hCallWnd[index]==hWnd){ g&8-X?^Q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ PeLzZ'$D  
    hCallWnd[index]=NULL; THgEHR0,}[  
    HotKey[index]=0; ~~m(CJ4S  
    HotKeyMask[index]=0; Im]6-#(9\|  
    bRemoved=TRUE; m}>Q#IVZ  
    KeyCount--; 'TA !JB+  
    break; tDMNpl  
   } ZG~d<kM&8s  
  } am7~  
 } @Q&k6.{4Z  
 return bRemoved; %&s4YD/{  
} 8,e%=7h_e  
cJM.Q_I}Y  
void VerifyWindow() ]*Kv[%r07c  
{ 6* 0vUy*"  
 for(int i=0;i<MAX_KEY;i++){ _?eT[!oO8  
  if(hCallWnd!=NULL){ #)iPvV'  
   if(!IsWindow(hCallWnd)){ dx$+,R~y  
    hCallWnd=NULL; m3&b)O7  
    HotKey=0; n?9FJOqi  
    HotKeyMask=0; FC]n?1?<(  
    KeyCount--; PSyUC#;  
   } VssWtL  
  } 7" )~JBH  
 } ktp<o.f[  
} <\P `<  
2zuQeFsK  
BOOL CHookApp::InitInstance() &VG  
{ _sY; dS/  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); *>xCX  
 hins=AfxGetInstanceHandle(); ^uPg71r:  
 InitHotkey(); r @ !  
 return CWinApp::InitInstance(); v I,T1%llu  
} ,R-aO= %  
n9-WZsc1  
int CHookApp::ExitInstance() 7<Y aw,G  
{ ,lFp4 C  
 VerifyWindow(); 432]yhQ  
 UnInit(); wxT( ktE  
 return CWinApp::ExitInstance(); Q{yjIy/b  
} ,zxv>8Nt  
'rA(+-.M;  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file J93xxj  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Lu5X~6j"$  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ >2X-98,  
#if _MSC_VER > 1000 K_!:oe7%  
#pragma once ;mPX8bT  
#endif // _MSC_VER > 1000 hML-zZ   
{faIyKtW  
class CCaptureDlg : public CDialog ;WgUhA ;q  
{ OB*V4Yv  
 // Construction ?/my G{E  
 public: *kEzGgTzoS  
  BOOL bTray; ExeZj8U  
  BOOL bRegistered; xErb11  
  BOOL RegisterHotkey(); `PSjk F(  
  UCHAR cKey; sz%_9;`dpL  
  UCHAR cMask; NFR>[L V  
  void DeleteIcon(); h[Uo6`  
  void AddIcon(); ,i8%qm8  
  UINT nCount; dlIYzO<  
  void SaveBmp(); <XN=v!2;  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor VKf&}u/  
  // Dialog Data Q|e-)FS)  
  //{{AFX_DATA(CCaptureDlg) c] t@3m  
  enum { IDD = IDD_CAPTURE_DIALOG }; U]@?[+I0]  
  CComboBox m_Key; p<,`l)o}~  
  BOOL m_bControl; 1aCpeD4|)  
  BOOL m_bAlt; M |f V7g  
  BOOL m_bShift; j-.Y!$a%6  
  CString m_Path; \O\q1 s~  
  CString m_Number; n9n)eI)R  
  //}}AFX_DATA O%N.;Ve  
  // ClassWizard generated virtual function overrides }r!hm?e  
  //{{AFX_VIRTUAL(CCaptureDlg) j#Tl\S!m.I  
 public: c*\;!dbP  
  virtual BOOL PreTranslateMessage(MSG* pMsg); {8oGWQgrj  
 protected: =%7s0l3z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $2RSYI`py  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); '4Fwh]Ee  
  //}}AFX_VIRTUAL y%spI/(  
  // Implementation Ks@c wY  
 protected: &/WE{W  
  HICON m_hIcon; UGj |)/  
  // Generated message map functions 8ZLHN',  
  //{{AFX_MSG(CCaptureDlg) Iy&,1CI"]  
  virtual BOOL OnInitDialog(); :2&"ak>N  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); +jyGRSo  
  afx_msg void OnPaint(); -a&<Un/  
  afx_msg HCURSOR OnQueryDragIcon(); u6 Lx3  
  virtual void OnCancel(); ,?k1if(0[  
  afx_msg void OnAbout(); Dad$_%  
  afx_msg void OnBrowse(); /jGV[_Q=P  
  afx_msg void OnChange(); Lj9RF<39g  
 //}}AFX_MSG 4+s6cQ]S`  
 DECLARE_MESSAGE_MAP() 7CvBE;i  
}; L+(ng  
#endif %^vT7c>  
!!H"B('m  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $(Mz@#%  
#include "stdafx.h" rp{|{>'`.q  
#include "Capture.h" a6^_iSk  
#include "CaptureDlg.h" Dfa3&# #{  
#include <windowsx.h> l $"hhI8  
#pragma comment(lib,"hook.lib") 13`Mt1R  
#ifdef _DEBUG pDSNI2  
#define new DEBUG_NEW . R/y`:1:W  
#undef THIS_FILE ?1a9k@[t  
static char THIS_FILE[] = __FILE__; 46Sz#^y P  
#endif ;%B9mM#p~  
#define IDM_SHELL WM_USER+1 6CIzT.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); JcA+ztPU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |=m.eU  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ^}B,0yUu'  
class CAboutDlg : public CDialog OmO#} k<  
{ bAGKi.  
 public: yi>A ogQ,  
  CAboutDlg(); gJ'pwSA  
  // Dialog Data 5$D"uAp<V  
  //{{AFX_DATA(CAboutDlg) 6 AGZ)gX  
  enum { IDD = IDD_ABOUTBOX }; J5I@*f)l  
  //}}AFX_DATA .'gm2  
  // ClassWizard generated virtual function overrides EN2SI+  
  //{{AFX_VIRTUAL(CAboutDlg) k[;)/LfhS  
 protected: =I@t%Y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support bIAE?D  
  //}}AFX_VIRTUAL Mz p<s<BX  
  // Implementation czuIs|_K*  
 protected: @wI>0B  
  //{{AFX_MSG(CAboutDlg) MQ-u9=ys  
  //}}AFX_MSG : ~vodh  
  DECLARE_MESSAGE_MAP() H.@$#D  
}; jTvcKm|q  
2Lf,~EV  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Qs6Vu)U=  
{ 4a+gM._+O  
 //{{AFX_DATA_INIT(CAboutDlg) % /VCjuV  
 //}}AFX_DATA_INIT ~Ld5WEp k3  
} d-D,Gx]>$  
Mh.1KI[t  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) _SAM8!q4,  
{ .d]/:T -0  
 CDialog::DoDataExchange(pDX); `$B?TNuch7  
 //{{AFX_DATA_MAP(CAboutDlg) P1Hab2%+  
 //}}AFX_DATA_MAP %^IQ<   
} ?,>3uD#  
73;Y(uh9  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) -3{Q`@F  
 //{{AFX_MSG_MAP(CAboutDlg) ^v'kEsE^*  
 // No message handlers J:yv82  
 //}}AFX_MSG_MAP r exv)!J  
END_MESSAGE_MAP() d m8t ~38  
'f\9'v  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) pAE (i7  
: CDialog(CCaptureDlg::IDD, pParent) '[ t.  
{ l{{,D57J  
 //{{AFX_DATA_INIT(CCaptureDlg) .SD-6GVD  
  m_bControl = FALSE; 'Qy6m'esW  
  m_bAlt = FALSE; `Nx@MPo  
  m_bShift = FALSE; i1vz{Tc  
  m_Path = _T("c:\\"); 3^7+fxYWo  
  m_Number = _T("0 picture captured."); # )y`Zz{h  
  nCount=0; Qn*l,Z]US  
  bRegistered=FALSE; 4=L>  
  bTray=FALSE; ; llPM`)  
 //}}AFX_DATA_INIT d@R7b^#g  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 =!'9TS  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); oy^-?+   
} r1L@p[>  
q`*.F#/4c  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) GW,EyOE+~  
{ Q,3kaR@O  
 CDialog::DoDataExchange(pDX); ):$KM{X  
 //{{AFX_DATA_MAP(CCaptureDlg) .-Lrrk)R+  
  DDX_Control(pDX, IDC_KEY, m_Key); e )0 ]WJ  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); QLY;@-jF$  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Kb%Y%j  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 8^UF0>`'  
  DDX_Text(pDX, IDC_PATH, m_Path); xMjhC;i{  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ?'> .>  
 //}}AFX_DATA_MAP & =[!L0{  
} IuXgxR%  
 d$$5&a  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) I3Vu/&8f|  
//{{AFX_MSG_MAP(CCaptureDlg) 3``JrkPI  
 ON_WM_SYSCOMMAND() aopPv&jY  
 ON_WM_PAINT() tWIOy6`  
 ON_WM_QUERYDRAGICON() 9JA@m  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ]}L'jK 0  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) [G}dPXD  
 ON_BN_CLICKED(ID_CHANGE, OnChange) [MIgQ.n  
//}}AFX_MSG_MAP XDPR$u8hM  
END_MESSAGE_MAP() 5 A0]+)5E8  
;Nn(  
BOOL CCaptureDlg::OnInitDialog() o/{`\4  
{ #/YS  
 CDialog::OnInitDialog(); mjD^iu8?  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); >=N-P< %  
 ASSERT(IDM_ABOUTBOX < 0xF000); wkp2A18n  
 CMenu* pSysMenu = GetSystemMenu(FALSE); fpf]qQ W~7  
 if (pSysMenu != NULL) yj:@Fg-3g  
 { /b,>fK^  
  CString strAboutMenu; x#0?$}f<  
  strAboutMenu.LoadString(IDS_ABOUTBOX); vkG#G]Qs";  
  if (!strAboutMenu.IsEmpty()) }g+kU1y  
  { fu!T4{2  
   pSysMenu->AppendMenu(MF_SEPARATOR); v2x+_K}J  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); q1rj!7  
  } sQgz}0_= )  
 } g (w/  
 SetIcon(m_hIcon, TRUE); // Set big icon IHEbT   
 SetIcon(m_hIcon, FALSE); // Set small icon #L.,aTA<  
 m_Key.SetCurSel(0); V lx.C~WYn  
 RegisterHotkey(); A+l(ew5Lw$  
 CMenu* pMenu=GetSystemMenu(FALSE); y.Z_\@  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); zmhc\M ?z  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); : #a  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 7hk<{gnr  
 return TRUE; // return TRUE unless you set the focus to a control fw&*;az  
} 9 dNB _  
kZ5#a)U<  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Z^'~iU-?  
{  xL15uWk-  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) uw3vYYFX  
 { 7^i7U-A<A  
  CAboutDlg dlgAbout; WWp MuB_G  
  dlgAbout.DoModal(); 3k'Bje?9~  
 } 6xDk3   
 else |Ahf 01  
 { =w3A{h"^  
  CDialog::OnSysCommand(nID, lParam); CU|E-XPW  
 } _*H Hdd5I  
} u[**,.Ecg  
nXn@|J&z~U  
void CCaptureDlg::OnPaint() /phMrL=  
{ M-t 9M~  
 if (IsIconic()) g|Lbe4?  
 { K+)3 LR^  
  CPaintDC dc(this); // device context for painting 3t<a3"{9  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?pZ"7kkD  
  // Center icon in client rectangle 9\EW~OgTu  
  int cxIcon = GetSystemMetrics(SM_CXICON); ,ciX *F"  
  int cyIcon = GetSystemMetrics(SM_CYICON); Ue \A ,  
  CRect rect; _. 9 5>`  
  GetClientRect(&rect); j4;^5 Dy^  
  int x = (rect.Width() - cxIcon + 1) / 2; dU9;sx  
  int y = (rect.Height() - cyIcon + 1) / 2; y#a,d||N1  
  // Draw the icon GTLS0l)  
  dc.DrawIcon(x, y, m_hIcon); t{c:<nN  
 } :;_}Gxx  
 else #HV5M1mb  
 { rCF=m]1zxT  
  CDialog::OnPaint(); 8=$XhC  
 } ,marNG  
} <P#BQt f  
PPl o0R  
HCURSOR CCaptureDlg::OnQueryDragIcon() no8\Oees  
{ %.d.h;^T  
 return (HCURSOR) m_hIcon; I\TSVJk^Xi  
} Ug+ K:YUq  
x'0_lf</ #  
void CCaptureDlg::OnCancel() ; =n}61  
{ se.HA  
 if(bTray) f_)#  
  DeleteIcon(); IoL P*D  
  CDialog::OnCancel(); gIrbOMQ7  
} VLV]e_D6s  
+c/!R|h=S  
void CCaptureDlg::OnAbout() @&G}'6vF!  
{ CmXLD} L_x  
 CAboutDlg dlg; VHPqEaR  
 dlg.DoModal(); /ckk qk"  
} g$NUu  
r^6@Zwox]  
void CCaptureDlg::OnBrowse() .tKBmq0xo"  
{ j5DCc,s  
 CString str; T;3qE1c  
 BROWSEINFO bi; K6-)l isf  
 char name[MAX_PATH]; c3GBY@m  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); JkN*hm?  
 bi.hwndOwner=GetSafeHwnd(); C&Qt*V#,  
 bi.pszDisplayName=name; C[.Xi  
 bi.lpszTitle="Select folder"; 7zx xO|p[  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ,vLQx\m{  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); `Kg!aN  
 if(idl==NULL) 2H w7V3q  
  return;  omg#[  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); TgjjwcO Y  
 str.ReleaseBuffer(); Ms+ekY)  
 m_Path=str; SrH::-{  
 if(str.GetAt(str.GetLength()-1)!='\\') mS[``$Z\!  
  m_Path+="\\"; %\HE1d5;  
 UpdateData(FALSE); /ojx$Um  
} L754odc  
tl /i  
void CCaptureDlg::SaveBmp() zWU]4;,"  
{ VoYL}67c  
 CDC dc; p*5_+u  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;o'r@4^&$R  
 CBitmap bm; ML'y`S  
 int Width=GetSystemMetrics(SM_CXSCREEN); 'm`}XGUBS  
 int Height=GetSystemMetrics(SM_CYSCREEN);  ?;v\wx  
 bm.CreateCompatibleBitmap(&dc,Width,Height); N@tKgx  
 CDC tdc; ]QHp?Ii1  
 tdc.CreateCompatibleDC(&dc); ?7V~>i8[  
 CBitmap*pOld=tdc.SelectObject(&bm); 5- GS@fY  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); "`cN k26JZ  
 tdc.SelectObject(pOld); G=[<KtWa  
 BITMAP btm; O >+=cg  
 bm.GetBitmap(&btm); /0qbRk i  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; RtR@wZ2\s  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); T0dD:sN  
 BITMAPINFOHEADER bih; q++\< \2  
 bih.biBitCount=btm.bmBitsPixel; &-qQF`7  
 bih.biClrImportant=0; ms5?^kS2O  
 bih.biClrUsed=0; [u!n=ev  
 bih.biCompression=0; {|>Wwa2e  
 bih.biHeight=btm.bmHeight; E"VF BKB  
 bih.biPlanes=1; s !?uLSEdb  
 bih.biSize=sizeof(BITMAPINFOHEADER); mrRid}2  
 bih.biSizeImage=size; 8Yk*$RR9  
 bih.biWidth=btm.bmWidth; -t S\  
 bih.biXPelsPerMeter=0; d/yF}%0QI  
 bih.biYPelsPerMeter=0; 4@{?4k-cq  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 9MfU{4:;I  
 static int filecount=0; SWx: -<  
 CString name; 11"r FZ  
 name.Format("pict%04d.bmp",filecount++); FHU6o910  
 name=m_Path+name; V:L%GWU  
 BITMAPFILEHEADER bfh; -_Z4)"k  
 bfh.bfReserved1=bfh.bfReserved2=0; ;$&\ :-6A#  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 8>[g/%W  
 bfh.bfSize=54+size; 9o5D3 d K  
 bfh.bfOffBits=54; CR'%=N04^  
 CFile bf; "g5{NjimY  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #at`7#K@  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); s.bo;lk  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); -c]AS[(  
  bf.WriteHuge(lpData,size); @~$"&B  
  bf.Close(); :Q"|%#P  
  nCount++; ]Ac}+?  
 } jG7PT66>;  
 GlobalFreePtr(lpData); ]87BP%G  
 if(nCount==1) B }%2FUv  
  m_Number.Format("%d picture captured.",nCount); HuTtp|zM>  
 else 7xeqs q  
  m_Number.Format("%d pictures captured.",nCount); L>~Tc  
  UpdateData(FALSE); X8ap   
} JXJ+lZmsz  
HQm_ K0$  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 1V1I[CxlX  
{ -%"PqA/1zj  
 if(pMsg -> message == WM_KEYDOWN) _|GbU1Hz  
 { At:8+S<?A  
  if(pMsg -> wParam == VK_ESCAPE) uRko[W(  
   return TRUE; ??p%_{QY~b  
  if(pMsg -> wParam == VK_RETURN) d)vP9vXy  
   return TRUE; q5R| ^uf  
 } ;B=aK"\  
 return CDialog::PreTranslateMessage(pMsg); ia'z9  
} 6E}9uwQ  
wv3,% lN  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) QKj0~ia 5  
{ CfU|]<  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 0mSP  
  SaveBmp();  .fl r  
  return FALSE; uTR^K=Ve  
} QnVr)4"  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ l@B9}Icq  
 CMenu pop; V,_m>$Mo  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ) 6)bI.BY  
 CMenu*pMenu=pop.GetSubMenu(0); pjFO0h_Y  
 pMenu->SetDefaultItem(ID_EXITICON); vv ,4n&D  
 CPoint pt; 4=tR_s  
 GetCursorPos(&pt); 'vBZh1`p  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); $].htm  
 if(id==ID_EXITICON) D|9+:Y  
  DeleteIcon(); *(Dmd$|0|  
 else if(id==ID_EXIT) u)0I$Tc"  
  OnCancel(); _h!.gZB3  
 return FALSE; 7l69SQo]?  
} 3{3@>8{w  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); gY~r{  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) GjhTF|  
 AddIcon(); !CYC7HeF  
 return res; 06pvI}   
} _Ub `\ytx  
!e|\1v'0  
void CCaptureDlg::AddIcon() !B3TLe h  
{ R(~wSL*R>  
 NOTIFYICONDATA data; H\S)a FY[  
 data.cbSize=sizeof(NOTIFYICONDATA); lDYgt UKG  
 CString tip; [7v|bd  
 tip.LoadString(IDS_ICONTIP); 5^Qa8yA>7  
 data.hIcon=GetIcon(0); !y _{mE?V(  
 data.hWnd=GetSafeHwnd(); |Ghk8 WA  
 strcpy(data.szTip,tip); Q6Gw!!Z5EA  
 data.uCallbackMessage=IDM_SHELL; /IpCo  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ;>?h/tS6  
 data.uID=98; G|g^yaq>  
 Shell_NotifyIcon(NIM_ADD,&data); nQc#AFg  
 ShowWindow(SW_HIDE); @yuiNj .T  
 bTray=TRUE; bT.q@oU  
} gN=.}$Kfu  
G>V6{g2Q  
void CCaptureDlg::DeleteIcon() n"EKVw7Y  
{ X 0y$xC|<  
 NOTIFYICONDATA data; T^}UE<  
 data.cbSize=sizeof(NOTIFYICONDATA); sW[-qPK<  
 data.hWnd=GetSafeHwnd(); jfuHZ^YA  
 data.uID=98; qE~_}4\Z9  
 Shell_NotifyIcon(NIM_DELETE,&data); P"vrYom  
 ShowWindow(SW_SHOW); 3xChik{  
 SetForegroundWindow(); =j,WQ66r3  
 ShowWindow(SW_SHOWNORMAL); F[jE#M=k  
 bTray=FALSE; ,L/x\_28  
} |u&cN-}C d  
P"w\hF  
void CCaptureDlg::OnChange() |H5.2P&9-5  
{ I/f\m}}ba  
 RegisterHotkey(); V"4Z9Qg}  
} E8# >k  
;Q;j@yx  
BOOL CCaptureDlg::RegisterHotkey() j!u)V1,  
{ 9-ozrw8t  
 UpdateData(); bU! v  
 UCHAR mask=0; cl~Yx 4  
 UCHAR key=0; n"(!v7YNp  
 if(m_bControl) P=94  
  mask|=4; s\ -,RQ1  
 if(m_bAlt) .9jKD*U|  
  mask|=2; z]G|)16  
 if(m_bShift) s*izhjjX  
  mask|=1; 0* $w(*  
  key=Key_Table[m_Key.GetCurSel()]; ?%s>a8w  
 if(bRegistered){ x}] 56f  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); BN_h3|)  
  bRegistered=FALSE; |9I)YD  
 } [oLV,O|s|j  
 cMask=mask; ^po@U"  
 cKey=key; gF)9a_R%p  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "%-Vrb=:Y  
 return bRegistered; wX,V:QE  
} <g[z jV9p  
%nZl`<M  
  四、小结 Z?axrGmg0  
hS]w A"\87  
  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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