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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: yTZbJx?m  
  ;{Ovqo|  
  一、实现方法 :!r_dmJ  
E~N}m7kTl/  
  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: L[O+9Yh  
B*?v`6  
#pragma data_seg("shareddata") $ Q2|{*  
HHOOK hHook =NULL; //钩子句柄 $(_i>&d<  
UINT nHookCount =0; //挂接的程序数目 RrRCT.+E  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 !{ )H  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 u}ab[$Q5  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey -M/ny-; `}  
static int KeyCount =0; 'X[3y^q  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 E%40u.0  
#pragma data_seg() W=G[hT5L{  
=o5hD,>e  
  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。 . e]!i(5I  
-bE{yT)7  
  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: rV1JJ.I  
R%5\1!Fl=G  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR %q:V  
cKey,UCHAR cMask) &d6'$h:kHb  
{ f PDnkr  
 BOOL bAdded=FALSE; .CmwR$u&  
 for(int index=0;index<MAX_KEY;index++){ Nf3Kz#!B  
  if(hCallWnd[index]==0){  /@%  
   hCallWnd[index]=hWnd; thUs%F.5?  
   HotKey[index]=cKey; NShA-G N5  
   HotKeyMask[index]=cMask; Kk#8r+ ,  
   bAdded=TRUE; 1UmV &  
   KeyCount++; bup;4~g  
   break; < FN[{YsA  
  } LM<OYRB(  
 } W\X51DrEx  
 return bAdded; ]Nm_<%lT  
} Gn&)*qCO  
//删除热键 LQR9S/?Ld  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -3bl !9h^  
{ Grkj @Q*  
 BOOL bRemoved=FALSE; $~U_VQIA^  
 for(int index=0;index<MAX_KEY;index++){ f<y""0L9  
  if(hCallWnd[index]==hWnd){ /G</ [N5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ UWmWouA  
    hCallWnd[index]=NULL; .dl1sv U  
    HotKey[index]=0; P 7gS M  
    HotKeyMask[index]=0; ( R Ttz  
    bRemoved=TRUE; } CQ GvH  
    KeyCount--; x'n J_0  
    break; $|sRj!F  
   } ^<ayPV)+  
  } 8m-ryr)  
 } fMhMB |W.  
 return bRemoved; C>t1~^Q},9  
} n,n]V$HFGh  
ZJI|762,  
MW`q*J`Yo  
  DLL中的钩子函数如下: -l$]>J~  
~Kt.%K5lgt  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) a o\+%s  
{ ^Cpvh}1#  
 BOOL bProcessed=FALSE; Wh 8fC(BE  
 if(HC_ACTION==nCode) #;2Ju'e#z  
 { "y>l2V,4j%  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 .:$%3#N$(Y  
   switch(wParam) :DQHb"(  
   {  I gA0RY1  
    case VK_MENU: n T\ W|  
     MaskBits&=~ALTBIT; K)F;^)KDHf  
     break; 0xZq?9a  
    case VK_CONTROL: IjJ3./L!5  
     MaskBits&=~CTRLBIT; .hBE&Y>\  
     break; \q%li)  
    case VK_SHIFT: Vc c/  
     MaskBits&=~SHIFTBIT; ;o"}7'4*R%  
     break; (g4.bbEm  
    default: //judge the key and send message nv@$'uQRp  
     break; Sxf<8Px9i  
   } vM|?;QM  
   for(int index=0;index<MAX_KEY;index++){ rEs,o3h?po  
    if(hCallWnd[index]==NULL) ysDfp'C,  
     continue;  fW|1AUD,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rp.JYz,  
    { )!){4c/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;R 'OdQ$o  
     bProcessed=TRUE; V5%B ,.d:  
    } /dh w~|  
   } i wQ'=M  
  } |jF)~k6  
  else if((lParam&0xc000ffff)==1){ //有键按下 Ah) _mxK  
   switch(wParam) =w_y<V4  
   { q-X)tH_+w@  
    case VK_MENU: @kRe0:t  
     MaskBits|=ALTBIT; C]\r~f  
     break; _`*x}  
    case VK_CONTROL: >mi%L3Pk  
     MaskBits|=CTRLBIT; [:TOU^  
     break; $kvF]|<bu  
    case VK_SHIFT: q2Ax-#  
     MaskBits|=SHIFTBIT; ,]42v?  
     break; fG2\p&z  
    default: //judge the key and send message <eI7xifD  
     break; e*Sv}4e=.  
   } h 5t,5e}  
   for(int index=0;index<MAX_KEY;index++){ !7P 1%/  
    if(hCallWnd[index]==NULL) & tkkn2t  
     continue; $ZH$x3;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?&pjP,a  
    { k 2_ "  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  #/MUiV  
     bProcessed=TRUE; /{\tkvv-Z  
    } "Z#97Jc+J  
   } H&6lQ30/)  
  } mc~d4<$`!  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 E<>n0",  
   for(int index=0;index<MAX_KEY;index++){ CJ%bBL'.  
    if(hCallWnd[index]==NULL) m .le' &  
     continue; l;b5v]~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) c<r`E  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); xT#j-T  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 `LEk/b1(P  
   } 9<W0'6%{/  
  } (|Y[5O)  
 } qXn %c"  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ]}<wS ]1  
} V+W,# 5  
GX4# IRq  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: &JVe -.  
!6'j W!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); P"cc$lB~I  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ha)eeE$  
`[0.G0i  
  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: S6*3."Sk  
wBTnI>l9[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gxycw4kz  
{ q%]0%S?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) o6P)IZ1  
 { Mmq{]q~At  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 (@vu/yN  
  SaveBmp(); dBE :rZu  
  return FALSE; g|a2z_R  
 } O{y2tz3  
 …… //其它处理及默认处理 <VS\z(K  
} l 'fUa  
\h~;n)FI  
.Vj;[p8  
  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。 a*0gd-e0@  
CP)x;  
  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。 {n2mh%I  
DB-4S-2  
  二、编程步骤 L&+XFntR  
B8NOPbT  
  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"; j)?I]j/  
f*04=R?w7>  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ]7}2"?J4v  
R;,+0r^i  
  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; RcitW;{|Kg  
,YX[6eZr  
  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;  S =!3t`  
NYz{ [LM  
  5、 添加代码,编译运行程序。 m*tmmP4R  
5 5>^H1M  
三、程序代码 '9>z4G*Td  
a]|P rjPI  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL f' Dl*d  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) t5G@M&d4Eo  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ id8a#&t]  
#if _MSC_VER > 1000 dU+28  
#pragma once #lRkp.e  
#endif // _MSC_VER > 1000 Gt{~u^<  
#ifndef __AFXWIN_H__ 7 [N1Vr(1  
#error include 'stdafx.h' before including this file for PCH _[zO?Div[  
#endif LRW7_XYz  
#include "resource.h" // main symbols `ySLic`  
class CHookApp : public CWinApp Z.Z+cFi  
{  k)o D  
 public: BFc=GiPnQ  
  CHookApp(); 02q]^3  
  // Overrides U@ x5cw:  
  // ClassWizard generated virtual function overrides 8Ih+^Y a  
  //{{AFX_VIRTUAL(CHookApp) z@iu$DZ  
 public: H]K(`)y}4  
  virtual BOOL InitInstance(); 1nhC! jDD  
  virtual int ExitInstance(); `j{ 5$X  
  //}}AFX_VIRTUAL z)I.^  
  //{{AFX_MSG(CHookApp) G]X72R?g  
  // NOTE - the ClassWizard will add and remove member functions here. */fmy|#   
  // DO NOT EDIT what you see in these blocks of generated code ! #G%[4.$n.  
  //}}AFX_MSG _PZGns,u  
  DECLARE_MESSAGE_MAP() ue@ fry  
}; ,r!_4|\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); . S4Xw2MS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6a5 1bj!f  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %/NB263Db  
BOOL InitHotkey(); GZ( W6 4  
BOOL UnInit(); ya8MjGo  
#endif ^=Q/ H  
PRcW}"m]Qg  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 'M+iw:R__  
#include "stdafx.h" -}Vnr\f  
#include "hook.h" {3cT\u  
#include <windowsx.h> .6z8fjttOC  
#ifdef _DEBUG Ey7SQb  
#define new DEBUG_NEW qC]6g  
#undef THIS_FILE h3U| ~h  
static char THIS_FILE[] = __FILE__; |tF:]jnIt  
#endif da<B6!  
#define MAX_KEY 100 g.$a]pZz  
#define CTRLBIT 0x04 8i"v7}  
#define ALTBIT 0x02 tGv5pe*r  
#define SHIFTBIT 0x01 ,Axk\7-  
#pragma data_seg("shareddata") 0<Q['l4Ar  
HHOOK hHook =NULL; %" kF i  
UINT nHookCount =0; ~~,] b  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey R"%zmA@o=  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 6z (7l  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ~5S[Sl  
static int KeyCount =0; 2H+!78  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift =UY)U-  
#pragma data_seg() t&m 8 V$Q  
HINSTANCE hins; g{0a]'ph  
void VerifyWindow(); +ZOjbI)  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ZYf0FC=-  
//{{AFX_MSG_MAP(CHookApp) ;nS.t_UW.  
// NOTE - the ClassWizard will add and remove mapping macros here. 84(NylZ  
// DO NOT EDIT what you see in these blocks of generated code! YQ/  
//}}AFX_MSG_MAP 5,Rxc=  
END_MESSAGE_MAP() NPc@;g]d"  
DXFU~J*  
CHookApp::CHookApp() "&!7wH ,A  
{ /Mq9~oC  
 // TODO: add construction code here, j~DTvWg<Jl  
 // Place all significant initialization in InitInstance DAYR=s  
} i3 ?cL4  
Fl8*dXG&  
CHookApp theApp; i{T mn  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Y 1v9sMN,  
{ ha Tmfh_|  
 BOOL bProcessed=FALSE; ">zK1t5=  
 if(HC_ACTION==nCode) wg-qq4Q\  
 {  8kn> ?  
  if((lParam&0xc0000000)==0xc0000000){// Key up YF)uAJAk  
   switch(wParam) 47<fg&T  
   { Vc2 (R^  
    case VK_MENU: R*S9[fqC[  
     MaskBits&=~ALTBIT; (*6kYkUK  
     break; 0[\sz>@  
    case VK_CONTROL: }o9fpo|  
     MaskBits&=~CTRLBIT; ML:Zm~A1U  
     break; >oD,wSYV~  
    case VK_SHIFT: D^m`&asC  
     MaskBits&=~SHIFTBIT; ,1|Qm8O  
     break; *P:!lO\|  
    default: //judge the key and send message 8D]&wBR:  
     break; 5)@UpcjUA  
   } FqWW[Bgd  
   for(int index=0;index<MAX_KEY;index++){ VWLqJd>tr1  
    if(hCallWnd[index]==NULL) 6VUkZKc  
     continue; Q L 1e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5I`_S Oa!  
    { $l W 7me  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *(+*tj cWa  
     bProcessed=TRUE; )I{~Pcq  
    } jV 'u*2&9  
   } *#y9P ve  
  } gRsV -qS  
  else if((lParam&0xc000ffff)==1){ //Key down +hZ{/  
   switch(wParam) Ia@!Nr2  
   { L>3-z>u,  
    case VK_MENU: ._X|Ye9/  
     MaskBits|=ALTBIT; 6&,{"N0 T  
     break; h 2QJQ|7a  
    case VK_CONTROL: S\poa:D`  
     MaskBits|=CTRLBIT; /:=,mWoO  
     break; (ah^</  
    case VK_SHIFT: fD* ?JzVY  
     MaskBits|=SHIFTBIT; HKXtS>7d  
     break; eWk W,a  
    default: //judge the key and send message V\m51H1mqo  
     break; 7`P1=`..  
   } BD_"w]bqD  
   for(int index=0;index<MAX_KEY;index++) yhsbso,5 a  
   { Hw\hTTK  
    if(hCallWnd[index]==NULL) S=zW wo$  
     continue; Ly~s84k_po  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cx_$`H  
    { L?&Trq7i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); C"cBlru8B  
     bProcessed=TRUE; CkeqK  
    } ]vQU(@+I  
   } p5V.O20  
  } D>6vI  
  if(!bProcessed){ dXMO{*MF{H  
   for(int index=0;index<MAX_KEY;index++){ +'`I]K>  
    if(hCallWnd[index]==NULL) b/g~;| <  
     continue; !#TM%w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) UNhM:!A  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); XJguw/[wm  
   } +9NI=s6  
  }  B@K =^77  
 } +*=?0\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Sd?+j;/"  
} T,uVt^.R+  
,0^9VWZV  
BOOL InitHotkey() IWNIk9T,u  
{ JrJTIUf_  
 if(hHook!=NULL){ FX&)~)  
  nHookCount++; Y}hz UKJ  
  return TRUE; `XK+Y  
 } $[HpY)MSRw  
 else NB .&J7v  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ;_D5]kl`  
  if(hHook!=NULL) *OR(8;  
   nHookCount++; kT ,2eel  
  return (hHook!=NULL); Jh`6@d  
} uTIl} N  
BOOL UnInit() 3=Va0}#&  
{ 9 ?(P?H  
 if(nHookCount>1){ &4V"FHy2  
  nHookCount--; hZDv5]V:0  
  return TRUE; Xb5 $ijH  
 } G{{Or  
 BOOL unhooked = UnhookWindowsHookEx(hHook); }ej-Lu,b3  
 if(unhooked==TRUE){ HH aerc  
  nHookCount=0; t.]c44RY  
  hHook=NULL; /u N3"m5i  
 } K0\Wty0  
 return unhooked; Dwi[aC+k  
} ^`Qh*:T$  
GcA!I!j/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _.ELN/$-  
{ #^;^_  
 BOOL bAdded=FALSE; _<P~'IN+n  
 for(int index=0;index<MAX_KEY;index++){ ^><B5A>;  
  if(hCallWnd[index]==0){ zV=(e( [  
   hCallWnd[index]=hWnd; 0CS80 pC  
   HotKey[index]=cKey; p!w}hB598  
   HotKeyMask[index]=cMask; -"Q[n,"Y  
   bAdded=TRUE; ky5gU[  
   KeyCount++; fl18x;^I  
   break; j])nkm7_  
  } SsF 5+=A  
 } >5!/&D.q  
 return bAdded; hhvP*a_J  
} vXi}B  
-?AaRwZ,  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,*$/2nB^  
{ Y)X58_En  
 BOOL bRemoved=FALSE; /+F|+1   
 for(int index=0;index<MAX_KEY;index++){ ,Uv8[ci%9  
  if(hCallWnd[index]==hWnd){ I NE,/a=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ oNV(C'A  
    hCallWnd[index]=NULL; vDAv/l9  
    HotKey[index]=0; 4c_F>Jw[  
    HotKeyMask[index]=0; FE/2.!]&o  
    bRemoved=TRUE; +6* .lRA  
    KeyCount--; B<Ynx_ 95  
    break; ~-w  
   } fJ3qL# '  
  } 9N'um%J3%s  
 } {@u}-6:wAT  
 return bRemoved; IJnr^S8  
} s=nE'/q1|  
db!2nImNu\  
void VerifyWindow() D{,B[5  
{ =c8U:\0  
 for(int i=0;i<MAX_KEY;i++){ r}~l(  
  if(hCallWnd!=NULL){ ]&ptld;  
   if(!IsWindow(hCallWnd)){ #:68}f"$  
    hCallWnd=NULL; =;3|?J0=  
    HotKey=0; Eu )7@  
    HotKeyMask=0; 5W!E.fz*T  
    KeyCount--; A{E0 a:v  
   } EtH)E)  
  } vN7ihe[C  
 } ~5wCehSb  
} Sg<''pUh  
ZX.VzZS  
BOOL CHookApp::InitInstance() 3A} n tA!  
{ =k[!p'~jD  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Hf %;FaJ=  
 hins=AfxGetInstanceHandle(); ' U)~|(\i  
 InitHotkey(); DZXv3gnX  
 return CWinApp::InitInstance(); \Rp)n=|  
} kx1-.~)p(z  
F ,{nG[PL  
int CHookApp::ExitInstance() =dX*:An  
{ PSHs<Z47  
 VerifyWindow(); %p2C5z?  
 UnInit(); S&]:=He  
 return CWinApp::ExitInstance(); d<6L&8)<  
} RkLH}`#  
[-$&pB>w8'  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file jVRd[  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) IFPywL{K  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ fD\h5`-  
#if _MSC_VER > 1000 O|j5ulO}&"  
#pragma once 1"odkM  
#endif // _MSC_VER > 1000 ]jHB'Y  
}C#YR( ]  
class CCaptureDlg : public CDialog {=g-zsc]K  
{ o-O/MS   
 // Construction K)Db3JIIk  
 public: z7PPwTBa  
  BOOL bTray; GN1cnM>`  
  BOOL bRegistered; A{6ZEQAh>  
  BOOL RegisterHotkey(); 5[gkGKkf_  
  UCHAR cKey; Ya9uu@F  
  UCHAR cMask; RL&3 P@r  
  void DeleteIcon(); c= a+7>  
  void AddIcon(); o3WkbMJWM  
  UINT nCount; (tq)64XVz  
  void SaveBmp(); ^m1Rw|  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor *h =7:*n  
  // Dialog Data 2CxdNj  
  //{{AFX_DATA(CCaptureDlg) Ew;<iY[  
  enum { IDD = IDD_CAPTURE_DIALOG }; s\jLIrG8  
  CComboBox m_Key; |nt J+  
  BOOL m_bControl; <01B\t7  
  BOOL m_bAlt; p[uwG31IL`  
  BOOL m_bShift; Y*}Sq|y  
  CString m_Path; A:NY:#uC  
  CString m_Number; sG VC+!E  
  //}}AFX_DATA X2e|[MWkp  
  // ClassWizard generated virtual function overrides ixS78KIr  
  //{{AFX_VIRTUAL(CCaptureDlg) v;$^1I  
 public: B)-S@.u  
  virtual BOOL PreTranslateMessage(MSG* pMsg); @s IZ  
 protected: )nJ>kbO~8  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,DE%p +q  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); W.67, 0m$  
  //}}AFX_VIRTUAL f(_qcgXp  
  // Implementation Zwt!nh   
 protected: NfO0^^"  
  HICON m_hIcon; ~0}eNz*  
  // Generated message map functions wM&G-~9ujk  
  //{{AFX_MSG(CCaptureDlg) p5H Mg\hT  
  virtual BOOL OnInitDialog(); c"z%AzUV'  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); qe$K6A%Yd  
  afx_msg void OnPaint(); iK#{#ebAoW  
  afx_msg HCURSOR OnQueryDragIcon(); f/c}XCH_h  
  virtual void OnCancel(); Sph+kiy|  
  afx_msg void OnAbout(); ^4fkZh  
  afx_msg void OnBrowse(); E+2y-B)E  
  afx_msg void OnChange(); AHA*yC  
 //}}AFX_MSG _ xC~44  
 DECLARE_MESSAGE_MAP() f@}(<#  
}; lR(&Wc\j  
#endif )b7mzDp(  
vK{K#{  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file g<C})84y3  
#include "stdafx.h" ;PHnv5 x@f  
#include "Capture.h" j;y|Ys)I  
#include "CaptureDlg.h" Qm-P& g-  
#include <windowsx.h> TXaXJIp  
#pragma comment(lib,"hook.lib") 5a`}DTB[Co  
#ifdef _DEBUG b?^n'0  
#define new DEBUG_NEW :d#NnR0^L  
#undef THIS_FILE 4Klfnki  
static char THIS_FILE[] = __FILE__; gMvvDP!Wp  
#endif zXD@M{  
#define IDM_SHELL WM_USER+1 CL*%06QyE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); JU@$(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xpxm9ySwu  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3pp w_?k  
class CAboutDlg : public CDialog bDo'hDmW  
{ 'KL(A-}!  
 public: op*+fJHD  
  CAboutDlg(); dF,FH-  
  // Dialog Data VJ"3G;;  
  //{{AFX_DATA(CAboutDlg) t5k&xV=~ #  
  enum { IDD = IDD_ABOUTBOX }; 8if"U xV(  
  //}}AFX_DATA _~kcr5  
  // ClassWizard generated virtual function overrides p(G?  
  //{{AFX_VIRTUAL(CAboutDlg) wl%1B64  
 protected: fUL"fMoU  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Cg Sdyg@  
  //}}AFX_VIRTUAL  {5udol5?  
  // Implementation Vk (bU=w  
 protected: P1QJ'eC;T  
  //{{AFX_MSG(CAboutDlg) :t qjm:  
  //}}AFX_MSG W!k6qTz)  
  DECLARE_MESSAGE_MAP() *K(xES! b  
}; _D9=-^  
B<LavX>F  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) .;2!c'mT9  
{ oc(bcU  
 //{{AFX_DATA_INIT(CAboutDlg) UjaC( c  
 //}}AFX_DATA_INIT CnH R&`  
} ]SL&x:/-  
Lvq]SzOw  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) !iVFzG @m  
{ 1,T9HpM  
 CDialog::DoDataExchange(pDX); ry ?2 o!  
 //{{AFX_DATA_MAP(CAboutDlg) k)py\  
 //}}AFX_DATA_MAP ?/( K7>`  
} 9pcf jx..  
v+#j>   
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) )^N8L<   
 //{{AFX_MSG_MAP(CAboutDlg) {*<C!Qg  
 // No message handlers [,^dM:E/  
 //}}AFX_MSG_MAP 3kCbD=yF  
END_MESSAGE_MAP() \z9?rvT:  
#!jRY!2Vt  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) lrhAO"/1  
: CDialog(CCaptureDlg::IDD, pParent) noA\5&hqW  
{ -ZP&zOsDr  
 //{{AFX_DATA_INIT(CCaptureDlg) rcx;3Vne  
  m_bControl = FALSE; x\.i `ukx  
  m_bAlt = FALSE; 0 '7s  
  m_bShift = FALSE; Wk?|BR]O  
  m_Path = _T("c:\\"); //lZmyP?  
  m_Number = _T("0 picture captured."); }+ 2"?f|]  
  nCount=0; /K) b0QX  
  bRegistered=FALSE; cWO )QIE  
  bTray=FALSE; vvAk<[  
 //}}AFX_DATA_INIT i*R:WTw#  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 V6MT>T  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); m5w9l"U]H  
} U;{,lS2l  
MLBg_<  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) P0ltN  
{ s2?,'es  
 CDialog::DoDataExchange(pDX); Gv,92ny!|  
 //{{AFX_DATA_MAP(CCaptureDlg) s~Wu0%])Q  
  DDX_Control(pDX, IDC_KEY, m_Key); W}k?gg=  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); IIQ3|eZ  
  DDX_Check(pDX, IDC_ALT, m_bAlt); p@8krOo`  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 8[1DO1*P  
  DDX_Text(pDX, IDC_PATH, m_Path); :Q ?J}N  
  DDX_Text(pDX, IDC_NUMBER, m_Number); s.;KVy,=Bu  
 //}}AFX_DATA_MAP *{dD'9Bg  
} 5u)^FIBj  
x_y>j)  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) RO$ @>vL  
//{{AFX_MSG_MAP(CCaptureDlg) RA/ =w&  
 ON_WM_SYSCOMMAND() i %hn  
 ON_WM_PAINT() )SL@ >Cij  
 ON_WM_QUERYDRAGICON() ?PE1aB+{:  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) }'V'Y[  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) +z(,A  
 ON_BN_CLICKED(ID_CHANGE, OnChange) K;y\[2;}e,  
//}}AFX_MSG_MAP !qXq y}?w  
END_MESSAGE_MAP() O3C)N I\i  
udEb/7ZL  
BOOL CCaptureDlg::OnInitDialog() xeYySM=  
{ _UBJPb@=U  
 CDialog::OnInitDialog(); +?j?|G  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); oa&US_  
 ASSERT(IDM_ABOUTBOX < 0xF000); !v5sWVVR  
 CMenu* pSysMenu = GetSystemMenu(FALSE); z<[.MH`ln  
 if (pSysMenu != NULL) h"BhTx7E}  
 { 8?j&{G  
  CString strAboutMenu; /2_B$  
  strAboutMenu.LoadString(IDS_ABOUTBOX); /R(U>pZ  
  if (!strAboutMenu.IsEmpty()) U)`3[fo  
  { >^T,U0T])  
   pSysMenu->AppendMenu(MF_SEPARATOR); 7:VEM;[d  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); HV*:<2P%D  
  } 4('0f:9z+  
 } }uvKE|umj  
 SetIcon(m_hIcon, TRUE); // Set big icon Y1yXB).AH8  
 SetIcon(m_hIcon, FALSE); // Set small icon b#Fk>j  
 m_Key.SetCurSel(0); @dE 3  
 RegisterHotkey(); Nn,vdu{^2  
 CMenu* pMenu=GetSystemMenu(FALSE); vbWJhj K0h  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 7dufY }}  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); f>s#Ngvc  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6z p@#vYI  
 return TRUE; // return TRUE unless you set the focus to a control (!_X:+0_  
} hpqHllL  
m0BG9~p|  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam)  EbBv}9g  
{ x;ERRK  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) }"&n[/8~  
 { X|-v0 f  
  CAboutDlg dlgAbout; bG5^h  
  dlgAbout.DoModal(); S<y>Y  
 } +Dq|l}  
 else .fLiXx  
 { M]6w^\4j9  
  CDialog::OnSysCommand(nID, lParam); 1*!c X  
 } rnMG0  
} B c,"12  
uGuc._}=  
void CCaptureDlg::OnPaint() #|{BGVp  
{ !~lVv&YO  
 if (IsIconic()) Q>}e IQ Y  
 { z^ aCQ3E  
  CPaintDC dc(this); // device context for painting jpYw#]Q  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); L;.VEz!  
  // Center icon in client rectangle ]b0zkoD9<  
  int cxIcon = GetSystemMetrics(SM_CXICON); a!c/5)v(  
  int cyIcon = GetSystemMetrics(SM_CYICON); IKMs Y5i  
  CRect rect; xVsa,EX b  
  GetClientRect(&rect); 6o[0sM_];  
  int x = (rect.Width() - cxIcon + 1) / 2; J+/}K>2#  
  int y = (rect.Height() - cyIcon + 1) / 2; 3i]"#wK  
  // Draw the icon 1V*8,YiC<  
  dc.DrawIcon(x, y, m_hIcon); kz7vbY  
 } dAYI DE  
 else dp"<KcP_  
 { Eonq'Re$  
  CDialog::OnPaint(); LKK{j,g7  
 } 8~&F/C*  
} c*S#UD+  
4)z3X\u|Z2  
HCURSOR CCaptureDlg::OnQueryDragIcon() "J]f0m=  
{ '\ph`Run  
 return (HCURSOR) m_hIcon; u4Y6B ]Q  
} >Jm-2W5J  
=,&u_>Dp  
void CCaptureDlg::OnCancel() q=P f^Xp  
{ +?URVp  
 if(bTray) K?h[.`}  
  DeleteIcon(); w$DG=!  
  CDialog::OnCancel(); 17V\2=Io  
} 4'+d"Ok  
paq8L{R  
void CCaptureDlg::OnAbout() vbr~<JT=  
{ 89*S? C1  
 CAboutDlg dlg; G*)s%2c>h  
 dlg.DoModal(); <ldid]o #  
} W@:^aH  
IT8B~I\OY  
void CCaptureDlg::OnBrowse() |RHO+J  
{ #D!$~ h&i  
 CString str; /-DKV~  
 BROWSEINFO bi; <h'8w  
 char name[MAX_PATH]; ,DE(5iDS  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ::4"wU3t  
 bi.hwndOwner=GetSafeHwnd(); CMC?R,d  
 bi.pszDisplayName=name; bcq@N  
 bi.lpszTitle="Select folder"; i0ILb/LS  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; pO\ S#GnX  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); !Bag}|#  
 if(idl==NULL)  II.<SC  
  return; Rb{+Ki  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Q<z)q<e  
 str.ReleaseBuffer(); ^bF}_CSE  
 m_Path=str; r`?&m3IOP  
 if(str.GetAt(str.GetLength()-1)!='\\') ]MC/t5vCu  
  m_Path+="\\"; =ft9T&ciD  
 UpdateData(FALSE); PqTYAN&F  
} n(Qj||:  
x*:n4FZ7b  
void CCaptureDlg::SaveBmp() w+Ad$4Pf"  
{ gBMta+<fE~  
 CDC dc; Jm?l59bv v  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); A$/KP\0Y2  
 CBitmap bm; AdDQWJ^r  
 int Width=GetSystemMetrics(SM_CXSCREEN); ?A|zRj{  
 int Height=GetSystemMetrics(SM_CYSCREEN); H( MB5  
 bm.CreateCompatibleBitmap(&dc,Width,Height); K3Huu!Tr  
 CDC tdc; ! &Z*yH  
 tdc.CreateCompatibleDC(&dc); !>\9t9  
 CBitmap*pOld=tdc.SelectObject(&bm); X d!Cp  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ;9K[~  
 tdc.SelectObject(pOld); 3QH(4N  
 BITMAP btm; ^GN5vT+:'  
 bm.GetBitmap(&btm); r i,2clp  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; \{kHSV%z  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); RvWFF^,.  
 BITMAPINFOHEADER bih; SzRL}}I  
 bih.biBitCount=btm.bmBitsPixel; 5Qb;2!  
 bih.biClrImportant=0; GX7VlI[  
 bih.biClrUsed=0; AD(xaQ&T  
 bih.biCompression=0; &.hoC Po$  
 bih.biHeight=btm.bmHeight; fH&zR#T7U4  
 bih.biPlanes=1; W^wd ([  
 bih.biSize=sizeof(BITMAPINFOHEADER); o.v2z~V  
 bih.biSizeImage=size; q5!0\o:  
 bih.biWidth=btm.bmWidth; 'HCnB]1  
 bih.biXPelsPerMeter=0; k@7kNMl  
 bih.biYPelsPerMeter=0; =<Hy"4+?.  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); FWIih5 3`  
 static int filecount=0; )ukF3;Gt  
 CString name; 4yhcK&  
 name.Format("pict%04d.bmp",filecount++); iL+y(]  
 name=m_Path+name; R3cg2H  
 BITMAPFILEHEADER bfh; o94P I*.  
 bfh.bfReserved1=bfh.bfReserved2=0; )4PB<[u  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Ln:lC( '  
 bfh.bfSize=54+size;  70{RDj6{  
 bfh.bfOffBits=54; Ac J>$L)  
 CFile bf; )mj<{Td`  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ >cTjA):  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); h:_NA  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Bf/ |{@  
  bf.WriteHuge(lpData,size); WBa /IM   
  bf.Close(); :fhB*SYK  
  nCount++; z[*zuo  
 } # 9V'';:  
 GlobalFreePtr(lpData); ssPI$IRg!  
 if(nCount==1) hc"6u\>  
  m_Number.Format("%d picture captured.",nCount); _nP)uU$  
 else I-TlrW=t  
  m_Number.Format("%d pictures captured.",nCount); RFB(d=o5S  
  UpdateData(FALSE); &"xQ~05  
} zqY)dk  
Xh`"  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) gXF.on4B  
{ ,2,W^HJ  
 if(pMsg -> message == WM_KEYDOWN) @\!ww/QT  
 { %TDXF_.[  
  if(pMsg -> wParam == VK_ESCAPE) y ^SyhG,V[  
   return TRUE; ?/)lnj)e{  
  if(pMsg -> wParam == VK_RETURN) Wy8,<K{  
   return TRUE; \<=IMa0  
 } ]r!QmWw~V  
 return CDialog::PreTranslateMessage(pMsg); Et.j1M|g  
} * O5:  
/e .D /;]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) QTfu:m{  
{ =E!x~S;N  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ %Sul4: D#  
  SaveBmp(); k},>^qE  
  return FALSE; .x>HA^4  
} UTvs |[  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ i_NJ -K  
 CMenu pop; V!W1fb7V  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); puA |NT  
 CMenu*pMenu=pop.GetSubMenu(0); yZ5 x8 8>  
 pMenu->SetDefaultItem(ID_EXITICON); ]{Z8  
 CPoint pt; 8'\~%xw  
 GetCursorPos(&pt); W-ez[raY  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); $e*B:}x}  
 if(id==ID_EXITICON) $HxS:3D%D  
  DeleteIcon(); ^j[Ku  
 else if(id==ID_EXIT) Qww^P/vm  
  OnCancel(); P2t_T'R}  
 return FALSE; ~GA8_B  
} zA,/@/'(  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); w2C&%Xk  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Ox|TMSb^  
 AddIcon(); +2Z#M  
 return res; HS7_MGU  
} i%MA"I\9  
]x@~-I )  
void CCaptureDlg::AddIcon() F3Ap1-%z  
{ hF.6}28U1  
 NOTIFYICONDATA data; S+iP^*L,c  
 data.cbSize=sizeof(NOTIFYICONDATA); F3Dt7q  
 CString tip; rd">JEK;;  
 tip.LoadString(IDS_ICONTIP); XGhwrI^  
 data.hIcon=GetIcon(0); i5VG2S  
 data.hWnd=GetSafeHwnd(); VKNp,Lf  
 strcpy(data.szTip,tip); VAs ( .y  
 data.uCallbackMessage=IDM_SHELL; M/} aq  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; -;U3w.-  
 data.uID=98; 6rT4iC3Q{  
 Shell_NotifyIcon(NIM_ADD,&data); {@45?L('  
 ShowWindow(SW_HIDE); G5;V.#"Z[  
 bTray=TRUE; J.W Ho c  
} PtqGX=u  
\lW_f{X)  
void CCaptureDlg::DeleteIcon() :~D]; m  
{ x9~[HuJ  
 NOTIFYICONDATA data; 5 q65nF  
 data.cbSize=sizeof(NOTIFYICONDATA); 7*;^UqGjz  
 data.hWnd=GetSafeHwnd(); [@|be.g  
 data.uID=98; ??(Kwtx{  
 Shell_NotifyIcon(NIM_DELETE,&data); S>#R_H<(  
 ShowWindow(SW_SHOW); # 66e@  
 SetForegroundWindow(); `|?]CkP  
 ShowWindow(SW_SHOWNORMAL); ;ctU&`  
 bTray=FALSE; ;'^, ,{  
} i. M2E$b|  
:".w{0l@  
void CCaptureDlg::OnChange() (u9Zk~)F  
{ fv2=B )8$  
 RegisterHotkey(); ?:/|d\,7@  
} C_Gzv'C"L  
F@EJtwLd5y  
BOOL CCaptureDlg::RegisterHotkey() ^yJ:+m;6K  
{ nvH|Ngg Q  
 UpdateData(); VMF|iB  
 UCHAR mask=0; uy9!qk  
 UCHAR key=0; 6v>z h  
 if(m_bControl) >)3VbO  
  mask|=4; Hm4bN\%  
 if(m_bAlt) pX_b6%yX(  
  mask|=2; DEtf(lW_  
 if(m_bShift) OD|1c6+X  
  mask|=1; !=[>r'+3  
  key=Key_Table[m_Key.GetCurSel()]; 7=3O^=Q ^Q  
 if(bRegistered){ wDw<KU1UK  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); `< Yf{'*  
  bRegistered=FALSE; TY6 rwU  
 } 9^\hmpP@D  
 cMask=mask; K(OaW)j  
 cKey=key; '\t7jQ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Xm@aYNV  
 return bRegistered; 75AslL?t  
} SH=:p^J  
p:tN642  
  四、小结 ,]q%/yxi  
9|3o<  
  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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