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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: r}T(?KGx  
  ?V&# nA  
  一、实现方法 &|MdBJ  
W2yNwB+{  
  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: B6UTooj  
N(c`h  
#pragma data_seg("shareddata") @@uKOFA?  
HHOOK hHook =NULL; //钩子句柄 gV~_m  
UINT nHookCount =0; //挂接的程序数目 ^hZZ5(</8P  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 w eX%S&#?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 _?~EWT   
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ,! b9  
static int KeyCount =0; #w]UP#^io  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 &"l Sq2  
#pragma data_seg() kZ5;Fe\*  
<<WqL?8W  
  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。 uE E;~`G  
c`,'[Q5(O  
  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: 7C / ^ Gw  
W=G8l%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR %/;*Ewwb  
cKey,UCHAR cMask) qL2!\zt>g  
{ <Fo~|Nh|  
 BOOL bAdded=FALSE; 7up~8e$_  
 for(int index=0;index<MAX_KEY;index++){ n Nu~)X  
  if(hCallWnd[index]==0){ {gT4Oq__  
   hCallWnd[index]=hWnd; BcXPgM!Xqz  
   HotKey[index]=cKey; Y' FB {  
   HotKeyMask[index]=cMask; BFnp[93N  
   bAdded=TRUE; -sqd?L.p  
   KeyCount++; .o#A(3&n  
   break; z"%{SI^  
  } D/)E[Fv+  
 } :@@aIFRv  
 return bAdded; ]621Z1  
} (l+0*o,(  
//删除热键 dD351!-  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0<FT=tKm  
{ EQ [K  
 BOOL bRemoved=FALSE; j82x$I*  
 for(int index=0;index<MAX_KEY;index++){ `a6AES'w$  
  if(hCallWnd[index]==hWnd){ :P8X?C63W]  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ l6T^e@*  
    hCallWnd[index]=NULL; */'j[uj  
    HotKey[index]=0; FFtB#  
    HotKeyMask[index]=0; ZHM NG~!  
    bRemoved=TRUE; )k[{re  
    KeyCount--; Xl,707  
    break; %`bn=~T^  
   } \RS0mb  
  } )tm%0z7R  
 } 2WUl8?f2Y  
 return bRemoved; g ySl.cxt  
} ]P*H,&I`#  
Z'~/=a)7  
V}h <,E9  
  DLL中的钩子函数如下: cv5+[;(b  
$Sgq7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) De ([fC  
{ MK.TBv  
 BOOL bProcessed=FALSE; rL,kDSLs  
 if(HC_ACTION==nCode)  )mH(Hx  
 { yZ-Ql1 1  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 >H5_,A}f  
   switch(wParam) }SFmv},Ij  
   {  : #OaE,  
    case VK_MENU: 9 K>~9Za  
     MaskBits&=~ALTBIT; ,7Dm p7  
     break; Q k2*=BVh  
    case VK_CONTROL:  eIj2(q9  
     MaskBits&=~CTRLBIT; /b]+RXvxj  
     break; _"t"orD6  
    case VK_SHIFT: |RH^|2:x9Q  
     MaskBits&=~SHIFTBIT; j9/hZqo  
     break; siOyp ]  
    default: //judge the key and send message b63DD(  
     break; +h? Gps  
   } [:/mjO K  
   for(int index=0;index<MAX_KEY;index++){ Am<){&XT ]  
    if(hCallWnd[index]==NULL) T"e"?JSRJ  
     continue; )TcD-Jr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V#+M lN  
    { z(#CO<C.t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); B A i ^t  
     bProcessed=TRUE; J u"/#@  
    } =)f.Yf|A*  
   } )0\D1IFJ  
  } "td ,YVK  
  else if((lParam&0xc000ffff)==1){ //有键按下 WeIi{<u8R  
   switch(wParam) H on,-<  
   { /tJ%gF  
    case VK_MENU: NftR2  
     MaskBits|=ALTBIT; %~\I*v04  
     break; -+0!Fkt@,  
    case VK_CONTROL: }}LjEOvL=  
     MaskBits|=CTRLBIT; g6h=Q3@  
     break; ;y;UgwAM  
    case VK_SHIFT: l]L"Ex{  
     MaskBits|=SHIFTBIT; $VeQvm*  
     break; L;U?s2&Y  
    default: //judge the key and send message &S[>*+}{+  
     break; z J V>;  
   } +;a\ gF^  
   for(int index=0;index<MAX_KEY;index++){ c^~R %Bx  
    if(hCallWnd[index]==NULL) km,@yU  
     continue; nu X`>Oy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |~+bbN|b  
    { `pXPF}T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /~+j[o B  
     bProcessed=TRUE; ?:7.3{|Aq  
    } vv D515i  
   } Q SvgbjdE  
  } nc?Oj B  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 (/|f6_9!  
   for(int index=0;index<MAX_KEY;index++){ *X 2dS {  
    if(hCallWnd[index]==NULL) RaA7 U   
     continue; H284 ]i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [ z{ }?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8p]Krs:  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 )5x,-m@  
   } rs@qC>_C0  
  } `jT1R!$3F  
 } t x1(6V&l;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); zLjQ,Lp.I  
} w"!zLB&9[  
:&m0eZZ%  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ~g&Gi)je  
A[Vhy;xz  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 30QQnMH3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xKXD`-|W  
t.] e8=dE  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: TYedem<$  
{+ WI>3  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 51puR8AG>  
{ $kh6-y@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) )z7+%nTO  
 {  KRh?{  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 rlkg.e6  
  SaveBmp(); Tl*FK?)MC^  
  return FALSE; ;CA7\&L>  
 } nn/_>%Y  
 …… //其它处理及默认处理 <a=k"'0  
} ig?Tj4kD  
okD7!)cr=  
!qJ|`o Y  
  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。 #po}Y  
0GnbE2&  
  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。 BoXGoFn  
Jek)`D  
  二、编程步骤 @W!cC#u  
D?P1\<A~  
  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"; )%9 P ;/  
$c24lJ#/  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 3qq 6X?y*  
d<v)ovQJ]  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; oBzjEv  
Z"a]AsG/Q#  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; <9Pf] G=  
67dp)X  
  5、 添加代码,编译运行程序。 si|b>R&Z  
S)*!jI  
三、程序代码 |I=\+P}s  
)-d &XN7  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL B#(2,j7M  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) e[J0+ x#;r  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 8}Su7v1  
#if _MSC_VER > 1000 }P"JP[#E\  
#pragma once 8(0q,7)y  
#endif // _MSC_VER > 1000 G1:2MPH  
#ifndef __AFXWIN_H__ Qrt> vOUE7  
#error include 'stdafx.h' before including this file for PCH ;Z}V}B  
#endif GA@Zfcg  
#include "resource.h" // main symbols O$ ;:5zT  
class CHookApp : public CWinApp +vCW${U  
{ 6IC/~Woghx  
 public: x0x/2re  
  CHookApp(); } T1~fa  
  // Overrides ]0)=0pc]E  
  // ClassWizard generated virtual function overrides Q2ky|  
  //{{AFX_VIRTUAL(CHookApp) )6Qk|gIu(  
 public: zmh3 Qa(  
  virtual BOOL InitInstance(); ~<w9a]  
  virtual int ExitInstance(); }u8D5Q<(  
  //}}AFX_VIRTUAL (eJYv: ^  
  //{{AFX_MSG(CHookApp) 2j7e@pr  
  // NOTE - the ClassWizard will add and remove member functions here. _J`q\N K  
  // DO NOT EDIT what you see in these blocks of generated code ! pZe:U;bb  
  //}}AFX_MSG olO&7jh7|  
  DECLARE_MESSAGE_MAP() 0YVkq?1x9  
}; ]Vgl  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); do(komP<\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \~bE|jWbj  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]o\y(!  
BOOL InitHotkey(); YPqp#X*  
BOOL UnInit(); rocG;$[  
#endif :$>TeCm  
Rw\S-z/  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. M/mUY  
#include "stdafx.h" P(&9S`I  
#include "hook.h" VwV`tKit  
#include <windowsx.h> -964#>n[  
#ifdef _DEBUG GS4 HYF  
#define new DEBUG_NEW ce\ F~8y  
#undef THIS_FILE -l` 1j6  
static char THIS_FILE[] = __FILE__; 0 SeDBs  
#endif G6L /Ny3>_  
#define MAX_KEY 100 |KxFi H  
#define CTRLBIT 0x04 wIT}>8o  
#define ALTBIT 0x02 )Vb_0n=^  
#define SHIFTBIT 0x01  ?[G!6  
#pragma data_seg("shareddata") QcDWVM'v  
HHOOK hHook =NULL; T5+iX`#M  
UINT nHookCount =0; l ,T*b  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey YaDr.?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT $!_]mz6*  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey , 1{)B  
static int KeyCount =0;  uM9[  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift '9MtIcNb  
#pragma data_seg() Z;#Ei.7p|  
HINSTANCE hins; -6KGQc}U  
void VerifyWindow(); ki^c)Tqn  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ymLhSF][  
//{{AFX_MSG_MAP(CHookApp) uT??t=vb  
// NOTE - the ClassWizard will add and remove mapping macros here. S@a#,,\[  
// DO NOT EDIT what you see in these blocks of generated code! 5B'};AQ  
//}}AFX_MSG_MAP Zom7yI  
END_MESSAGE_MAP() O8N\  
Xbb('MoI63  
CHookApp::CHookApp() -S7rOq2Li  
{ ~"+Fp&[9f  
 // TODO: add construction code here, {D jz']  
 // Place all significant initialization in InitInstance d M&BnI  
} t<6`?\Gk  
{IW pI *  
CHookApp theApp; nsJN)Pt  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) '_~=C-g  
{ Ex ?)FL$4  
 BOOL bProcessed=FALSE; `_6!nk q8  
 if(HC_ACTION==nCode) jtk2>Ol   
 { G,8LF/sR  
  if((lParam&0xc0000000)==0xc0000000){// Key up b1}P3W  
   switch(wParam) 4#z@B1Jx  
   { ,afh]#  
    case VK_MENU: yH8 N8  
     MaskBits&=~ALTBIT; : qKxm(  
     break; +Zx+DW cq  
    case VK_CONTROL: O&!tW^ih  
     MaskBits&=~CTRLBIT; U. 1Vpfy  
     break; xrK%3nA4s"  
    case VK_SHIFT: x-5XOqD{'  
     MaskBits&=~SHIFTBIT; MT,LO<.  
     break; M<,E[2op  
    default: //judge the key and send message D 5qCn^R  
     break; k@eU #c5c  
   } Cr,UP8MO  
   for(int index=0;index<MAX_KEY;index++){ )hHkaI>eYv  
    if(hCallWnd[index]==NULL) (N U*PQY6  
     continue; F(8>"(C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dE+xU(\, w  
    { Syn>;FX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 9'I I!  
     bProcessed=TRUE; Uu9\;f  
    } @L8('8~d  
   } #L{QnV.3  
  } OgNt"Vg  
  else if((lParam&0xc000ffff)==1){ //Key down >Rw[x  
   switch(wParam) f!~gfnn  
   { =>Vo|LBoe  
    case VK_MENU: )POuH*j  
     MaskBits|=ALTBIT; Eg?6$[U`8<  
     break; 0)V<)"i  
    case VK_CONTROL: `?Yh`P0  
     MaskBits|=CTRLBIT; ldo7}<s  
     break; iNR6BP W  
    case VK_SHIFT: 5uK:f\y)l  
     MaskBits|=SHIFTBIT; vMXS%Q  
     break; }Lx?RU+@=  
    default: //judge the key and send message J 21D/#v  
     break; XQhBnam%  
   } Yw=Ve 0  
   for(int index=0;index<MAX_KEY;index++) #5kQn>R  
   { |2\6X's  
    if(hCallWnd[index]==NULL) [ds:LQq)/  
     continue; a[:0<Ek  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n^|n6(EZ  
    { =Uta5$\a)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); LqTyE  
     bProcessed=TRUE; s% "MaDz  
    } /a%5!)NE%  
   } &,xN$  
  } h#?L6<*tm  
  if(!bProcessed){ Us'm9 J  
   for(int index=0;index<MAX_KEY;index++){ rS>JzbWa  
    if(hCallWnd[index]==NULL) Z;bzp3v  
     continue; =N`"%T@=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) c~(+#a  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); N %-Cp)  
   } \iAkF`OC  
  } rLNo7i  
 } g*b`V{/Vw  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?yF)tF+<  
} wAxXK94#3  
D;It0"  
BOOL InitHotkey() -cCujDM#T  
{ | eIN<RY5  
 if(hHook!=NULL){ R74kt36M  
  nHookCount++; 1@C0c%  
  return TRUE; I|JMkP  
 } a3 <D1"  
 else pGz-5afL  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); \~1M\gZP  
  if(hHook!=NULL) w: ~66 TCI  
   nHookCount++; q_5k2'4K  
  return (hHook!=NULL); 716JnG>  
} IMjnj|Fj  
BOOL UnInit() o`HZS|>K*  
{ OS6 l*S('  
 if(nHookCount>1){ 8*3<Erv  
  nHookCount--; l [?o du4  
  return TRUE; ]:JoGGE a0  
 } ]S4kWq{Y  
 BOOL unhooked = UnhookWindowsHookEx(hHook); a|`Pg1j#  
 if(unhooked==TRUE){ KFdTw{GlJ7  
  nHookCount=0; ^!-*xH.dK  
  hHook=NULL; .oYUA}  
 } Fd-PjW/E8  
 return unhooked; v2:A 4Pd:+  
} zR(}X8fP  
yHl1:cf(y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _6&x$ *O  
{ ozF>2`K }  
 BOOL bAdded=FALSE; kt.z,<w5O  
 for(int index=0;index<MAX_KEY;index++){ 7jT]J   
  if(hCallWnd[index]==0){ 1q<BYc+z  
   hCallWnd[index]=hWnd; {wRsV=*  
   HotKey[index]=cKey; 2e zQX2q  
   HotKeyMask[index]=cMask; CN@bJo2  
   bAdded=TRUE; M ()&GlNs  
   KeyCount++; cj@Ygc)n  
   break; n5A0E2!  
  } ^4_)a0Kcm,  
 } '5.n2 8W>  
 return bAdded; QWv+J a  
} i ~fkjn  
Z9mY*}:U~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6wx;grt'Z  
{ *|ez|*-  
 BOOL bRemoved=FALSE; ~;k-/Z"  
 for(int index=0;index<MAX_KEY;index++){ 7udMF3;>  
  if(hCallWnd[index]==hWnd){ Vm6G5QwM  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Juj"cjob  
    hCallWnd[index]=NULL; -l<b|`s=w.  
    HotKey[index]=0; a:Js i=  
    HotKeyMask[index]=0; oCdWf63D  
    bRemoved=TRUE; b;#3X)  
    KeyCount--; wl #Bv,xf  
    break; 5 G cdz  
   } e5_a.c  
  } 2`I" QU  
 } $ 5ZBNGr  
 return bRemoved; 6U6,Wu  
} YU.aZdA&V3  
s~$ZTzV  
void VerifyWindow() f/RzE  
{ 5mUHk]W  
 for(int i=0;i<MAX_KEY;i++){ f4)fa yAVp  
  if(hCallWnd!=NULL){ `P<}MeJ\l  
   if(!IsWindow(hCallWnd)){ sL|*0,#K  
    hCallWnd=NULL; 0gw0  
    HotKey=0; nS)U+q-x&o  
    HotKeyMask=0; =.O8G=;DOA  
    KeyCount--; yjlX@YXnw  
   } \\XvVi:B  
  } ra=U,  
 } Hj't.lg+j  
} wl H6  
z[X>>P3<n  
BOOL CHookApp::InitInstance() $L_-U~^  
{ 1@sy:{ d`  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); T%Xl(.Ft  
 hins=AfxGetInstanceHandle(); E}Q'Wz|k  
 InitHotkey(); m(SGE,("w  
 return CWinApp::InitInstance(); @ofivCc<%  
} 9HrT>{@  
;X,|I)  
int CHookApp::ExitInstance() {J;[ Hf5  
{ x9q?^\x  
 VerifyWindow(); V/"UDof  
 UnInit(); ^.)oQo SE  
 return CWinApp::ExitInstance(); ~kPHf_B;z  
} ]W39HL  
$q,2VH:Ip  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file -qaJ@T+J+7  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 5H#f;L\k  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ *Z\B9mx  
#if _MSC_VER > 1000 U8Z(=*Z3  
#pragma once .1<QB{4~v  
#endif // _MSC_VER > 1000 V:HxRMF2X  
@ -CZa^g  
class CCaptureDlg : public CDialog |N, KA|Gdq  
{ I WKq_Zjkz  
 // Construction F,+nj?i!  
 public: vFm8T58 7  
  BOOL bTray; yXP+$oox9  
  BOOL bRegistered; /ap3>xkt  
  BOOL RegisterHotkey(); ){^o"A?-:  
  UCHAR cKey; ,]RMa\Q4Wg  
  UCHAR cMask; f Ne9as  
  void DeleteIcon(); .anXsjD%W  
  void AddIcon(); x6Zhw9RV  
  UINT nCount; v&Xsyb0CaM  
  void SaveBmp(); jez=q  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor mh&wvT<:{  
  // Dialog Data 6BK-(>c(6  
  //{{AFX_DATA(CCaptureDlg) k?]`PUrV  
  enum { IDD = IDD_CAPTURE_DIALOG }; h=h4`uA9  
  CComboBox m_Key; n4A_vz  
  BOOL m_bControl; shlMJa?  
  BOOL m_bAlt; vpnQs#8O  
  BOOL m_bShift; dC+WII`V  
  CString m_Path; &$$KC?!w  
  CString m_Number; (%.[MilxPM  
  //}}AFX_DATA L~9Q7 6w  
  // ClassWizard generated virtual function overrides 5hN)y-4@  
  //{{AFX_VIRTUAL(CCaptureDlg) [Z~h!}  
 public: Q(v*I&k  
  virtual BOOL PreTranslateMessage(MSG* pMsg); c"HB7  
 protected: 'w//d $+G_  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ou8V7  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Ai>=n;  
  //}}AFX_VIRTUAL iQs^2z#Bd  
  // Implementation &w15 GO;4  
 protected: I)7STzlMj.  
  HICON m_hIcon; b>g&Pf#N!  
  // Generated message map functions xE>H:YPm  
  //{{AFX_MSG(CCaptureDlg) Y$JGpeq8w  
  virtual BOOL OnInitDialog(); *UL++/f  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~4gOv  
  afx_msg void OnPaint(); *iLlBE  
  afx_msg HCURSOR OnQueryDragIcon(); Z*uv~0a>9Q  
  virtual void OnCancel(); I_h u s  
  afx_msg void OnAbout(); Z[9) hGh  
  afx_msg void OnBrowse(); _yx~t  
  afx_msg void OnChange(); o>4mkh[3  
 //}}AFX_MSG 7\(m n$  
 DECLARE_MESSAGE_MAP() RHO | g0  
}; |T`ZK?B+u  
#endif c,@&Z#IZ`  
|w; hu]  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file &.W,Hh  
#include "stdafx.h" >}~\*Y\8@  
#include "Capture.h" !fX&i6  
#include "CaptureDlg.h" b$@vJ7V!  
#include <windowsx.h> DA=#T2)p  
#pragma comment(lib,"hook.lib") |!t &ZpdD  
#ifdef _DEBUG >qE f991SZ  
#define new DEBUG_NEW au=A+  
#undef THIS_FILE P"-*'q,9  
static char THIS_FILE[] = __FILE__; {L6@d1u  
#endif b0VEMu81k  
#define IDM_SHELL WM_USER+1 Q[PVkZ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8Dy5g  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); B'NtG84  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; VrQgn9L  
class CAboutDlg : public CDialog xE>jlr?  
{ 6=pE5UfT  
 public: OdKfU^  
  CAboutDlg(); S7!+8$2mc_  
  // Dialog Data /H (55^EMZ  
  //{{AFX_DATA(CAboutDlg) rgo#mTQ_  
  enum { IDD = IDD_ABOUTBOX }; }xx"  
  //}}AFX_DATA ,5*Z<[*  
  // ClassWizard generated virtual function overrides ) wZ;}O  
  //{{AFX_VIRTUAL(CAboutDlg) L<D<3g|4  
 protected: "FD`1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \p4>onGI  
  //}}AFX_VIRTUAL =Ff _)k  
  // Implementation ZYS`M?Au  
 protected: bm>N~DC  
  //{{AFX_MSG(CAboutDlg) {UeS_O>(  
  //}}AFX_MSG lIhP\:;S&  
  DECLARE_MESSAGE_MAP() g49G7sk  
}; I3I1<}>]Z  
Yamu"#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ;{L~|q J  
{ 8_W=)w6  
 //{{AFX_DATA_INIT(CAboutDlg) 8(3n v[  
 //}}AFX_DATA_INIT V><,.p8  
} @5RbMf{  
)tvP|  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) :?!b\LJ2^  
{ ?d!*[Ke8  
 CDialog::DoDataExchange(pDX); ?2(5 2?cJ  
 //{{AFX_DATA_MAP(CAboutDlg) !+FrU'^  
 //}}AFX_DATA_MAP Q6 oM$qiM  
} 0-P,zkK_v  
M&[bb $00j  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 8NZQTRdH  
 //{{AFX_MSG_MAP(CAboutDlg) J#'8]p3E  
 // No message handlers | V: 9 ][\  
 //}}AFX_MSG_MAP .IU\wN  
END_MESSAGE_MAP() PtTL tiE~  
Iwx~kvz\_(  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) wo+ b":  
: CDialog(CCaptureDlg::IDD, pParent) P.y06^ X}A  
{ 0 :iR=S  
 //{{AFX_DATA_INIT(CCaptureDlg) Wa5B;X~  
  m_bControl = FALSE; \:BixBU7  
  m_bAlt = FALSE; \; voBU  
  m_bShift = FALSE; u<['9U  
  m_Path = _T("c:\\"); " "@kBY1C  
  m_Number = _T("0 picture captured."); ^j!2I&h1  
  nCount=0; B7QRG0  
  bRegistered=FALSE; A.9ZFFz  
  bTray=FALSE; c4f3Dr'xw  
 //}}AFX_DATA_INIT i7XM7 +}  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 gbrn'NT  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); | LX Vf  
} ]?7q%7-e.a  
NNxz Z!q!  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) <GWzdj?  
{ n \i ~H  
 CDialog::DoDataExchange(pDX); v]GQb  
 //{{AFX_DATA_MAP(CCaptureDlg) 12VSzIm  
  DDX_Control(pDX, IDC_KEY, m_Key); EJW}&e/  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); :Ahw{z`H#  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 9u;/l#?@T  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); aizJ&7(>  
  DDX_Text(pDX, IDC_PATH, m_Path); ,W|cyQ  
  DDX_Text(pDX, IDC_NUMBER, m_Number); $L4h'(s  
 //}}AFX_DATA_MAP *Y':raP  
} gF>t+"+ x  
m9=93W?   
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) L,O.XR  
//{{AFX_MSG_MAP(CCaptureDlg) ^]NFr*'!  
 ON_WM_SYSCOMMAND() Bwc_N.w?3  
 ON_WM_PAINT() X \BxRgl},  
 ON_WM_QUERYDRAGICON() O?`_RN4l  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) KG=57=[  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 1EMud,,:  
 ON_BN_CLICKED(ID_CHANGE, OnChange) K`0'2  
//}}AFX_MSG_MAP $(]E$ek  
END_MESSAGE_MAP() ]7{ e~U  
bo-L|R&O  
BOOL CCaptureDlg::OnInitDialog() n_{az{~  
{  y 2C Jk~  
 CDialog::OnInitDialog(); +QEP:#qZw  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ]]NTvr  
 ASSERT(IDM_ABOUTBOX < 0xF000); vD^Uod1  
 CMenu* pSysMenu = GetSystemMenu(FALSE); FEO /RMh  
 if (pSysMenu != NULL) yNhRh>l  
 { e-Z ul.m  
  CString strAboutMenu; @R_ON"h  
  strAboutMenu.LoadString(IDS_ABOUTBOX); .(7m[-iF!  
  if (!strAboutMenu.IsEmpty()) +a"f)4\  
  { gtnu/ Q  
   pSysMenu->AppendMenu(MF_SEPARATOR); (DkfLadB  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); hkB|rhJgm  
  } Mi} .  
 } n%6ba77  
 SetIcon(m_hIcon, TRUE); // Set big icon *zwo="WA\t  
 SetIcon(m_hIcon, FALSE); // Set small icon mndKUI}d  
 m_Key.SetCurSel(0); OH13@k  
 RegisterHotkey(); fXe$Ug|5a  
 CMenu* pMenu=GetSystemMenu(FALSE); qg2Vmj<H  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); <Gna}ALkg  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Vb)NWXmyu  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); (]` rri*^  
 return TRUE; // return TRUE unless you set the focus to a control  20]p<  
} ?IG[W+M8  
8},:  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) DLN zH  
{ Kk).KgR  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) =gB8(1g8  
 { >9NC2%61S  
  CAboutDlg dlgAbout; "&/lF[q  
  dlgAbout.DoModal(); ^ib =fLu  
 } mqtYny'  
 else F1t+D)KA>  
 { )O2IEwPd.  
  CDialog::OnSysCommand(nID, lParam); #||D,[ _=+  
 } Jflm-Hhsf  
} J |w%n5Y  
8O_yZ ~Z4  
void CCaptureDlg::OnPaint() Us.k,  
{ hEFOT]P4  
 if (IsIconic()) 26;Gt8  
 { {rwT4]4  
  CPaintDC dc(this); // device context for painting Q ZC\%X8j  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); (^"2"[?a  
  // Center icon in client rectangle (((|vI3 <  
  int cxIcon = GetSystemMetrics(SM_CXICON); =ea.+  
  int cyIcon = GetSystemMetrics(SM_CYICON); L&d.&,CNs'  
  CRect rect; DkSs^ym  
  GetClientRect(&rect); uu.}<VM.1  
  int x = (rect.Width() - cxIcon + 1) / 2; ?r{hrAx  
  int y = (rect.Height() - cyIcon + 1) / 2; fB 0X9iV6j  
  // Draw the icon 6OB3%R'p  
  dc.DrawIcon(x, y, m_hIcon); [C\B2iU7_M  
 } 91-[[<  
 else 4hxa|f  
 { iuA_ Jr  
  CDialog::OnPaint(); <I#M^}`  
 } +`iJ+  
} +4Fw13ADE  
1Ko4O)L]&  
HCURSOR CCaptureDlg::OnQueryDragIcon() & WeN{  
{ G+2 ,x0(  
 return (HCURSOR) m_hIcon; hV+=hX<h  
} M?AKJE j5  
qi ">AQpp  
void CCaptureDlg::OnCancel() e<qfM&*  
{ Ldj*{t `5  
 if(bTray) 7X)4ec9H\  
  DeleteIcon(); ==BOW\  
  CDialog::OnCancel(); LpL$=9  
} fv@<  
/=T:W*C  
void CCaptureDlg::OnAbout() ~9"c64 q  
{ }KO <II  
 CAboutDlg dlg; ?\)h2oi!F5  
 dlg.DoModal(); w IP4Z^  
} UZs'H"K  
gm%cAme  
void CCaptureDlg::OnBrowse()  <k0/O  
{ p I~;3T:!  
 CString str; G8 q<)  
 BROWSEINFO bi; Uu52uR  
 char name[MAX_PATH]; M[+#*f.T}  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Yep~C %/}  
 bi.hwndOwner=GetSafeHwnd(); hzU(XW  
 bi.pszDisplayName=name; ExMd$`gW  
 bi.lpszTitle="Select folder"; B*Ey&DAV  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Rt:^'Qi$!  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ef)zf+o  
 if(idl==NULL) LlS~J K  
  return; 2[;~@n1P  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); |fW_9={1kQ  
 str.ReleaseBuffer(); kv6nVlI)B  
 m_Path=str; .wmqaLd%  
 if(str.GetAt(str.GetLength()-1)!='\\') !Qf*d;wxn(  
  m_Path+="\\"; N:okt)q:%  
 UpdateData(FALSE); cRuN;  
} zWv0y8[d  
yn"4qC#Z  
void CCaptureDlg::SaveBmp() tj*/%G{Y  
{ +KD7Di91<K  
 CDC dc; ;4(}e{  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Pjn{3/*wi  
 CBitmap bm; j@w1S[vt  
 int Width=GetSystemMetrics(SM_CXSCREEN); :`E p#[Wvo  
 int Height=GetSystemMetrics(SM_CYSCREEN); d S'J@e=#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); z{FFTb^B  
 CDC tdc; 2Y<]X7Ch:  
 tdc.CreateCompatibleDC(&dc); FE]UqB  
 CBitmap*pOld=tdc.SelectObject(&bm); 0AdxV?6z  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ]31=8+D  
 tdc.SelectObject(pOld); Y9>92#aME  
 BITMAP btm; 'n ^,lXWB  
 bm.GetBitmap(&btm); =*I|z+  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 8 ]exsn Z  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); @g4o8nH}  
 BITMAPINFOHEADER bih; *nHuGla  
 bih.biBitCount=btm.bmBitsPixel; 3!osQ1  
 bih.biClrImportant=0; {y a .  
 bih.biClrUsed=0; zsd1n`r  
 bih.biCompression=0; 6}?d%K  
 bih.biHeight=btm.bmHeight; p:K%-^  
 bih.biPlanes=1; 4obW>  
 bih.biSize=sizeof(BITMAPINFOHEADER); \gB ~0@[\7  
 bih.biSizeImage=size; Goc?HR  
 bih.biWidth=btm.bmWidth; w^ OB  
 bih.biXPelsPerMeter=0; 096Yd=3h  
 bih.biYPelsPerMeter=0; H17I" 5N  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); xb<|m2<)H  
 static int filecount=0; 1DhC,)+D}q  
 CString name; d6 ef)mw  
 name.Format("pict%04d.bmp",filecount++); beC%Tnb7  
 name=m_Path+name; )XGz#C_P  
 BITMAPFILEHEADER bfh; Lt=32SvTn  
 bfh.bfReserved1=bfh.bfReserved2=0; \/?J)k3H.  
 bfh.bfType=((WORD)('M'<< 8)|'B'); =4co$oD}  
 bfh.bfSize=54+size; |/^S%t6*  
 bfh.bfOffBits=54; ;>f\fhi'  
 CFile bf; 3l45(%g+  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ (XW'1@b  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); E5@=LS  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); y`j=(|DV  
  bf.WriteHuge(lpData,size); vq^';<Wh.  
  bf.Close(); *i^$xjOa  
  nCount++; ]K*R[  
 } DU$#tg}{  
 GlobalFreePtr(lpData); 5h`LWA B  
 if(nCount==1) )\ceanS  
  m_Number.Format("%d picture captured.",nCount); 4xr^4\ lk  
 else Su"Z3gm5Kw  
  m_Number.Format("%d pictures captured.",nCount); 9Dgs A`{$  
  UpdateData(FALSE); "C\yM{JZ  
} K%+4M#jj5  
W dD889\  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) oKCy,Ot<  
{ /\b* oPWJ  
 if(pMsg -> message == WM_KEYDOWN) *jbPy?%oY  
 { !5C"`@}q>  
  if(pMsg -> wParam == VK_ESCAPE) 2dkWzx  
   return TRUE; 3 dJ362  
  if(pMsg -> wParam == VK_RETURN) !cYID \}S,  
   return TRUE; X,_K )f  
 } /\# f@Sg  
 return CDialog::PreTranslateMessage(pMsg); c6#E gN,X  
} p\&/m  
)!\6 "{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) YCh`V[0  
{ zMu9A|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ v-d"dC`  
  SaveBmp(); g.@[mf0r  
  return FALSE; `dG;SM$T,  
} #gO[di0WhC  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ c/A?-9  
 CMenu pop; +cqUp6x.  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); q,@# cQBV  
 CMenu*pMenu=pop.GetSubMenu(0); wCg7JW#  
 pMenu->SetDefaultItem(ID_EXITICON); $%MgIy  
 CPoint pt; S-q"'5>  
 GetCursorPos(&pt); B I)@n:p  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); qvB{vU  
 if(id==ID_EXITICON) T@U,<[,   
  DeleteIcon(); BJWlx*U]  
 else if(id==ID_EXIT) 9!Q ZuZY  
  OnCancel(); qe{;EH*  
 return FALSE; 0VtjVz*C7&  
} Q|h$D~  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); zpT^:Ag  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) n19A>,m  
 AddIcon(); GHd1?$  
 return res; {+hABusq  
} .=J- !{z  
$V!.z%Vgf  
void CCaptureDlg::AddIcon() XV]xym~  
{ 452kE@=49  
 NOTIFYICONDATA data; LdG?kbJ&y  
 data.cbSize=sizeof(NOTIFYICONDATA); \WFcb\..  
 CString tip; [YULvWAJ  
 tip.LoadString(IDS_ICONTIP); H Eq{TUTr  
 data.hIcon=GetIcon(0); QJ;dw8  
 data.hWnd=GetSafeHwnd(); 1g{}O^ul  
 strcpy(data.szTip,tip); SA}Dkt&,  
 data.uCallbackMessage=IDM_SHELL; = NZgbl  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; */aQ+%>jf  
 data.uID=98; $&Vba@v  
 Shell_NotifyIcon(NIM_ADD,&data); ZH;4e<gg  
 ShowWindow(SW_HIDE); TS9<uRO0  
 bTray=TRUE; (LmU\Pe%  
} 9 ;p5z[jI  
mI,lW|/l,  
void CCaptureDlg::DeleteIcon() /\-}-"dm  
{ zgEN2d  
 NOTIFYICONDATA data; 0 a{hCx|$J  
 data.cbSize=sizeof(NOTIFYICONDATA); 2I_ yUt-  
 data.hWnd=GetSafeHwnd(); 'hU5]}=  
 data.uID=98; ;!S5P(  
 Shell_NotifyIcon(NIM_DELETE,&data); U'ctO%  
 ShowWindow(SW_SHOW); X/2GTU7?  
 SetForegroundWindow(); 8Lx/ZGy  
 ShowWindow(SW_SHOWNORMAL); f;BY%$  
 bTray=FALSE; ?# FYF\P  
} }i"[5:  
$Bz};@  
void CCaptureDlg::OnChange() XH~(=^/_  
{  4bA^Gq  
 RegisterHotkey(); 7:?\1 a  
} T^|k`  
AaA!U!B  
BOOL CCaptureDlg::RegisterHotkey() {24>&<p  
{ }W}(k2r  
 UpdateData(); l$\2|D  
 UCHAR mask=0; "[?DS  
 UCHAR key=0; AJEbiP  
 if(m_bControl) iZy>V$Aq  
  mask|=4; dB6 ,pY(  
 if(m_bAlt) $rcv@-l  
  mask|=2; ;K\2/"$QD  
 if(m_bShift) 5s3QN{h8  
  mask|=1; yPtE5"(o  
  key=Key_Table[m_Key.GetCurSel()]; >4luZnWMI  
 if(bRegistered){ ;UTM9.o[  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Q&r. wV|  
  bRegistered=FALSE; -fFtHw:kHh  
 } C_Q3^mLx  
 cMask=mask; A_S7z*T  
 cKey=key; JH]S'5X8K  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 07:V[@'  
 return bRegistered; T(x@ gwc  
} L5x;# \#p  
x6R M)rr  
  四、小结 E8r6P:5d`  
<DR|r  
  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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