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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: y+ze`pL?  
  Z71m(//*}  
  一、实现方法 {o24A: M  
^-Od*DTL  
  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: .}!.4J%q2  
7_i8'(``  
#pragma data_seg("shareddata") Kb?{^\FiU  
HHOOK hHook =NULL; //钩子句柄 ~'_cBJ 'XD  
UINT nHookCount =0; //挂接的程序数目 ;yJ:W8U]+;  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 o]oiJvOr  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 &+2l#3}  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ,_3hbT8Q  
static int KeyCount =0; tz@MZs09  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 !e|\1v'0  
#pragma data_seg() !B3TLe h  
R(~wSL*R>  
  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。 p' >i3T(  
27eG8  
  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: >u$8Z  
ZUQ _u  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR >Wr%usNxc  
cKey,UCHAR cMask) d<a|dwAeh  
{ O{LCHtN  
 BOOL bAdded=FALSE; K29/7A/  
 for(int index=0;index<MAX_KEY;index++){ C27:ty V  
  if(hCallWnd[index]==0){ !?>V^#c  
   hCallWnd[index]=hWnd; }S/i3$F0~  
   HotKey[index]=cKey; 1]7gYNzV"  
   HotKeyMask[index]=cMask; QadguV6|  
   bAdded=TRUE; -G,}f\Cg  
   KeyCount++; {.:$F3T  
   break; $6"(t=%{  
  } /d3Jd .l!  
 } OT{"C"%5t  
 return bAdded; *1dDs^D#|  
} D!&(#Vl _  
//删除热键 P"vrYom  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k]@]a  
{ A;TP~xq\  
 BOOL bRemoved=FALSE; y"q aa  
 for(int index=0;index<MAX_KEY;index++){ [r/zBF-.  
  if(hCallWnd[index]==hWnd){ &P?2H66s  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ o:@Q1+p  
    hCallWnd[index]=NULL; Urr%SIakvM  
    HotKey[index]=0; L|'^P3#7`  
    HotKeyMask[index]=0; >pU9}2fpT  
    bRemoved=TRUE; I/dy^5@F  
    KeyCount--; !a@)6or  
    break; [C "\]LiX  
   } w"^h<]b  
  } 9"P|Csj  
 } bx3Q$|M?  
 return bRemoved; <gp?}Lk  
} I_J&>}V'  
[*',pG  
s6bsVAO>  
  DLL中的钩子函数如下: po*G`b;v  
I^ ?tF'E  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) kU<t~+  
{ R+M&\ 5  
 BOOL bProcessed=FALSE; T D _@0Rd  
 if(HC_ACTION==nCode)  z:,PwLU  
 { eM5?fE&!&  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Zzlf1#26\  
   switch(wParam) [oLV,O|s|j  
   {  ^po@U"  
    case VK_MENU: gF)9a_R%p  
     MaskBits&=~ALTBIT; [qYr~:`-[  
     break; 5>x_G#W  
    case VK_CONTROL: h|qJ{tUWc$  
     MaskBits&=~CTRLBIT; vQMBJ&  
     break; 8`q7Yss6F  
    case VK_SHIFT: }E 'r?N  
     MaskBits&=~SHIFTBIT; _Iy\,<  
     break; 8%[pno |0I  
    default: //judge the key and send message @Wu-&Lb  
     break; _;1{feR_  
   } d?2V2`6  
   for(int index=0;index<MAX_KEY;index++){ Y %JQ  
    if(hCallWnd[index]==NULL) 9njl,Q:  
     continue; "z~ba>,-\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ux;?WPyr  
    { Ke$_l]}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); v 4ot08 C  
     bProcessed=TRUE; g*Y, .  
    } y?$DDD  
   } 6}4})B2  
  } DP ? d C`  
  else if((lParam&0xc000ffff)==1){ //有键按下 Wq1>Bj$J8  
   switch(wParam) *pKTJP  
   { }47h0 i  
    case VK_MENU: ++0)KSvw  
     MaskBits|=ALTBIT; d ]P~  
     break; &k }f"TX2  
    case VK_CONTROL: "s+4!,k  
     MaskBits|=CTRLBIT; AJPvwu}D  
     break; ;P@]7vkff  
    case VK_SHIFT: m#7(<#  
     MaskBits|=SHIFTBIT; >Fel) a  
     break; </h^%mnd  
    default: //judge the key and send message >L7s[vKn  
     break; ^J'_CA  
   } / ;]5X  
   for(int index=0;index<MAX_KEY;index++){ 8H!QekQZ]\  
    if(hCallWnd[index]==NULL) rpR${%jc  
     continue; }#XFa#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,WT>"9+  
    { }Z!D?(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); )g0fN+Mb  
     bProcessed=TRUE; {0zn~+  
    } %Sr+D{B  
   } 7},A. q  
  } =CX1jrLZ  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 )BP*|URc  
   for(int index=0;index<MAX_KEY;index++){ K@D\5s|1|  
    if(hCallWnd[index]==NULL) ^Co-!jM  
     continue; \/a6h   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {MUB4-@?F$  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); r~4uIUE{  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 7u):J  
   } rO1!h%&o"  
  } 3*b5V<}'|  
 } w:~*wv  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); C-'hXh;hQ  
} {1W:@6tl  
ccD+AGM.  
  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)D_  !iz  
KpLmpK1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U.%Kt,qB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qNp1<QO0  
xP;r3u s  
  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: O7K.\  
{@Mr7*u  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) o2 14V\  
{ wX$:NOO  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) /ZLY@&M  
 { xO~ ElzGm  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 jlEz]@ i  
  SaveBmp(); ()3\(d5e  
  return FALSE; N ##`  
 } _7 3q,3`24  
 …… //其它处理及默认处理 ,"(L2+Yp  
} ]Bw0Qq F#  
>DqF>w.1  
:6^7l/p  
  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。 ?$r`T]>`2  
0XHQ 5+"8  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 M6Fo.eeK3  
Q?{%c[s  
  二、编程步骤 #YUaM<O  
x0*{oP  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; M`xiC  
gv#\}/->4  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Y +gY"  
_T=g?0 q  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; VFHd2Ea(  
LF<&gC  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ,Kit@`P%  
8`Ya7c>  
  5、 添加代码,编译运行程序。 eim+oms  
my=f}%k=  
三、程序代码 RaZ>.5 D  
92+8zX  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL  Cs,H#L  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Ucj?$=  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ZykMri3bi  
#if _MSC_VER > 1000 W :w~ M'o  
#pragma once s}D>.9  
#endif // _MSC_VER > 1000 ]BQYVx/  
#ifndef __AFXWIN_H__ r-2k<#^r  
#error include 'stdafx.h' before including this file for PCH sE1cvAw9l  
#endif Z6jEj9?O  
#include "resource.h" // main symbols Mf}M/Fh  
class CHookApp : public CWinApp wBPo{  
{ ITu19WG  
 public: )8Va%{j  
  CHookApp(); 9 _d2u#  
  // Overrides M>Q]{/V7T  
  // ClassWizard generated virtual function overrides s?SspuV  
  //{{AFX_VIRTUAL(CHookApp) x3@-E  
 public:  ao(T81  
  virtual BOOL InitInstance(); ~MpikBf  
  virtual int ExitInstance(); ;"3B,Yj  
  //}}AFX_VIRTUAL ,pNx(a  
  //{{AFX_MSG(CHookApp) {4"V)9o-1>  
  // NOTE - the ClassWizard will add and remove member functions here. 9g92eKS  
  // DO NOT EDIT what you see in these blocks of generated code ! 2wf&jGHs  
  //}}AFX_MSG 2[E wN!IZ  
  DECLARE_MESSAGE_MAP() <v"o+  
}; !e$gp (4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 5J5si<v25  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); DE?v'7cmA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &W `xZyb3  
BOOL InitHotkey(); R>Ra~ b  
BOOL UnInit(); n|`3d~9$&  
#endif n ]ikc|  
XtF m5\U  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. GK?ual1  
#include "stdafx.h" ^0VL](bD>  
#include "hook.h" @hLkU4S  
#include <windowsx.h> q76POytV|  
#ifdef _DEBUG 'CLZ7 pV  
#define new DEBUG_NEW qnm_#!&uHT  
#undef THIS_FILE  ;C]Ufk  
static char THIS_FILE[] = __FILE__; h}b:-a  
#endif 8hRcB[F~S  
#define MAX_KEY 100 1MelHW  
#define CTRLBIT 0x04 f60w%  
#define ALTBIT 0x02 Iv`IJQH>  
#define SHIFTBIT 0x01 8:cbr/F<  
#pragma data_seg("shareddata") ">A<%5F2  
HHOOK hHook =NULL; 5&Oc`5QD  
UINT nHookCount =0; 4aayMS !#  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Hl*vS  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ^xo<$zn  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey .nV2 n@SR  
static int KeyCount =0; >J"IN I  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 5/H,UL  
#pragma data_seg() ,'#TdLe  
HINSTANCE hins; 7y=>Wa?T[  
void VerifyWindow(); 3"fDFR  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) A_9WSXR  
//{{AFX_MSG_MAP(CHookApp) qT O6I5u  
// NOTE - the ClassWizard will add and remove mapping macros here. Z\0Rw>#  
// DO NOT EDIT what you see in these blocks of generated code! 3;nOm =I  
//}}AFX_MSG_MAP @sXFu[!U  
END_MESSAGE_MAP() _1" ecaA  
ZbnAAbfKH  
CHookApp::CHookApp() f%Q)_F[0D4  
{ +`y(S}Z  
 // TODO: add construction code here, +9)Jtm oL  
 // Place all significant initialization in InitInstance TS<d?:  
} /-=fWtA  
XxqGsGx4  
CHookApp theApp; <}a?<):S  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) +X?ErQm  
{ ~ELY$G.xl  
 BOOL bProcessed=FALSE; Gvb2>ZN  
 if(HC_ACTION==nCode) XN<SKW(H3  
 { K+g[E<x\=  
  if((lParam&0xc0000000)==0xc0000000){// Key up #A63?kDE&&  
   switch(wParam) 8-$t7bV5  
   { !oLn=  
    case VK_MENU: sJHVnMA  
     MaskBits&=~ALTBIT; 4WT[(  
     break; nF3}wCe)  
    case VK_CONTROL: &|>@K#V8-;  
     MaskBits&=~CTRLBIT; +ikSa8)*i  
     break; 9u=A:n\  
    case VK_SHIFT: .?>Cav9:  
     MaskBits&=~SHIFTBIT; ldv@C6+J  
     break; L3&Ys3-h  
    default: //judge the key and send message ^BsT>VSH6  
     break; *dBy<dIy  
   } 3bEcKA_z(  
   for(int index=0;index<MAX_KEY;index++){ y]9R#\P/  
    if(hCallWnd[index]==NULL) =j7Du[?Vu  
     continue; dab]>% M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -YoL.`s1   
    { w,{h9f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6j E.X  
     bProcessed=TRUE; ^'UM@dd?!  
    } N['DqS =  
   } 1v@#b@NXM7  
  } xJq|,":gj  
  else if((lParam&0xc000ffff)==1){ //Key down q8 v iC|  
   switch(wParam) qpQ;,8X-"  
   { iOL$|Z(  
    case VK_MENU: )>a~%~:  
     MaskBits|=ALTBIT; RQ+,7Ir  
     break; !V|{(>+<  
    case VK_CONTROL: }1a}pm2p  
     MaskBits|=CTRLBIT; ["Zvwes#7  
     break; G|i0n   
    case VK_SHIFT: \S}/2]* 1  
     MaskBits|=SHIFTBIT; zAgX{$/Fg  
     break; R >xd*A  
    default: //judge the key and send message Y;'<u\^M"  
     break; D 0Xl`0"'  
   } ( eV,f  
   for(int index=0;index<MAX_KEY;index++) *&U~Io"U  
   { *>fr'jj1$  
    if(hCallWnd[index]==NULL) >hunV'vu'  
     continue; +Z`=iia>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y6(PG:L  
    { r. 82RoG?G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); E@}F^0c  
     bProcessed=TRUE; ?Uql 30A  
    } $5nMD=   
   } ^WA7X9ed  
  } !Tzo &G  
  if(!bProcessed){ &/@V$'G=  
   for(int index=0;index<MAX_KEY;index++){ ]#0 (  
    if(hCallWnd[index]==NULL) +eVYy_bL-  
     continue; 1tuvJ+`{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ZL|aB886  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); wMS%/l0p1  
   } ]n^iG7aB?  
  } q4ROuE|d  
 } @ @[xTyA  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Nt>^2Mv   
} BabaKSm}LP  
)&6gju7(  
BOOL InitHotkey() Nd8>p.iqO  
{ CKAd\L   
 if(hHook!=NULL){ 8/e-?2l  
  nHookCount++; -CPtYG[s  
  return TRUE; 7x)Pt@c  
 } \ o<ucp\J  
 else 3,PR6a,b'  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); mK:gj&N7X|  
  if(hHook!=NULL) hSehJjEoM  
   nHookCount++; :{u`qi  
  return (hHook!=NULL); |q`NJ  
} dT| XcVKg  
BOOL UnInit() =<]`'15"V  
{ J8i;E 4R  
 if(nHookCount>1){ vQWmHv\P  
  nHookCount--; _i_='dsyW/  
  return TRUE; C qd\n#d/~  
 } 2 6#p,P  
 BOOL unhooked = UnhookWindowsHookEx(hHook); PV68d; $:8  
 if(unhooked==TRUE){ .}faWzRH9  
  nHookCount=0; b{0a/&&1O  
  hHook=NULL; P&`%VW3E  
 } v9(5H Y  
 return unhooked; RZ6y5  
} rr# nBhh8  
9r%fBiSk  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) t]K20(FSN  
{ B{Q}^Mcxy  
 BOOL bAdded=FALSE; <rC%$tr  
 for(int index=0;index<MAX_KEY;index++){ o.KnDY  
  if(hCallWnd[index]==0){ U[C>Aoze  
   hCallWnd[index]=hWnd; 5|*{~O|  
   HotKey[index]=cKey; % /:1eE`!S  
   HotKeyMask[index]=cMask; 2A_1E \  
   bAdded=TRUE; MQ,K%_m8  
   KeyCount++; IQ&PPC  
   break; WNR]GI  
  } Vr2A7kq  
 } gP_N|LuF"  
 return bAdded;  : (UK'i  
} uFr12ZFgK  
"FHJ_$!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q,?_;,I}  
{ /@:X0}L  
 BOOL bRemoved=FALSE; >n7h%c  
 for(int index=0;index<MAX_KEY;index++){ 0C zQel)L:  
  if(hCallWnd[index]==hWnd){ TdFU,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ I Q_6DF  
    hCallWnd[index]=NULL; ; Y/nS  
    HotKey[index]=0; (%_X{R'  
    HotKeyMask[index]=0; |5u~L#P  
    bRemoved=TRUE; KL \>-  
    KeyCount--; yD"]:ts3  
    break; ^4=#, K  
   } 2"&GH1  
  } 7@@g|l]  
 } gvP-doA7W  
 return bRemoved; N~/ 'EaO  
} =3-=p&*  
3IYFvq~  
void VerifyWindow() ^E}?YgNp  
{  h,/Aq  
 for(int i=0;i<MAX_KEY;i++){ ?:r?K|Ku  
  if(hCallWnd!=NULL){ =lAjQt  
   if(!IsWindow(hCallWnd)){ IfmQP s+f  
    hCallWnd=NULL; L{/% "2>  
    HotKey=0; O Z ./suR)  
    HotKeyMask=0; eT b!xb  
    KeyCount--; Pmv@  
   } BX/3{5Y>{  
  } nDn J}`k  
 } l uP;P&  
} .\_):j*  
/r4l7K  
BOOL CHookApp::InitInstance() XFWpHe_ L  
{ Y` }X5(A@  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); B:h<iU:'D  
 hins=AfxGetInstanceHandle(); vW?\bH7}I  
 InitHotkey(); gnJ8tuS  
 return CWinApp::InitInstance(); AM+5_'S,  
} kQkc+sGJf  
9#9 UzKX#  
int CHookApp::ExitInstance() @gN"Q\;F  
{ 3ijPm<wn  
 VerifyWindow(); !hVbx#bXl  
 UnInit(); DS?.'"n[u  
 return CWinApp::ExitInstance(); Pn!~U] A$%  
} !.P||$x`&  
MpOU>\  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ,rMDGZm?  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) N sdpE?V  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ g8O6 b  
#if _MSC_VER > 1000 W ^'|{9&m  
#pragma once <,CrE5Pl  
#endif // _MSC_VER > 1000 U:8[%a  
<0d2{RQ;  
class CCaptureDlg : public CDialog qyM/p.mP  
{ J>(X0@eWz  
 // Construction TuQGF$n@  
 public: QIiy\E%  
  BOOL bTray; h0<PQZJ  
  BOOL bRegistered; ROFZ*@CH<  
  BOOL RegisterHotkey(); xhP~]akHN7  
  UCHAR cKey; ZiUb+;JA  
  UCHAR cMask; 9FDu{4:  
  void DeleteIcon(); vRe{B7}p;  
  void AddIcon(); F! =l r  
  UINT nCount; lpG%rN!  
  void SaveBmp(); ^/BGOBK  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ",,#q  
  // Dialog Data Mj;V.Y  
  //{{AFX_DATA(CCaptureDlg) m* m),mZ"  
  enum { IDD = IDD_CAPTURE_DIALOG }; -,bnj^L  
  CComboBox m_Key; uw\@~ ,d  
  BOOL m_bControl; %u!=<yn'  
  BOOL m_bAlt; xr'1CP  
  BOOL m_bShift; [6a-d> e{  
  CString m_Path; l!*_[r   
  CString m_Number; +gd5&  
  //}}AFX_DATA t"$~o:U&)  
  // ClassWizard generated virtual function overrides b`X''6  
  //{{AFX_VIRTUAL(CCaptureDlg) mG S4W;  
 public: <>6j>w_|  
  virtual BOOL PreTranslateMessage(MSG* pMsg); %>FtA)  
 protected: IV,4BQ$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support G(t:s5:  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 6qT@M0)i  
  //}}AFX_VIRTUAL SES.&e|!6  
  // Implementation ?4':~;~  
 protected: ! JA;0[;l=  
  HICON m_hIcon; Cu7{>"  
  // Generated message map functions 529b. |  
  //{{AFX_MSG(CCaptureDlg) =Pv_,%  
  virtual BOOL OnInitDialog(); ~ *&\5rPb  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); `#$}P;W  
  afx_msg void OnPaint(); 7IxeSxXH  
  afx_msg HCURSOR OnQueryDragIcon(); "0HUaU,e  
  virtual void OnCancel(); JY  
  afx_msg void OnAbout(); ~/G)z?+E  
  afx_msg void OnBrowse(); AERJ]$\  
  afx_msg void OnChange(); )'kpO>_G  
 //}}AFX_MSG _V$'nz#>e  
 DECLARE_MESSAGE_MAP() 4<Vi`X7[F  
}; M FIb-*wT  
#endif V}V->j*  
vK!`#W`X  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file *s4|'KS2o  
#include "stdafx.h" [Vs\r&qL  
#include "Capture.h" iaL@- dg  
#include "CaptureDlg.h" ~ YH?wdT  
#include <windowsx.h> E`TZ:W]r,  
#pragma comment(lib,"hook.lib") @6UtnX'd  
#ifdef _DEBUG nkHl;;WJ  
#define new DEBUG_NEW !R8%C!=a  
#undef THIS_FILE R&|.Lvmc/  
static char THIS_FILE[] = __FILE__; MtJ-pa~n  
#endif :{a< ~n`  
#define IDM_SHELL WM_USER+1 pyhXET '  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >W>rhxU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }r,M (Zr  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; h:fiUCw  
class CAboutDlg : public CDialog [e><^R*u  
{ 9d"*Z%!j  
 public: JX0M3|I=  
  CAboutDlg(); _=$~l^Y[  
  // Dialog Data vgeqH[:  
  //{{AFX_DATA(CAboutDlg) Xmr}$<<=  
  enum { IDD = IDD_ABOUTBOX }; MT/jpx  
  //}}AFX_DATA {]>c3=~FQb  
  // ClassWizard generated virtual function overrides [S'1OR$FQ\  
  //{{AFX_VIRTUAL(CAboutDlg) Q:q0C  +T  
 protected: *duG/?>P  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dBI-y6R  
  //}}AFX_VIRTUAL Y|R=^ =d\  
  // Implementation _9>,9aL  
 protected: Hf('BagBL  
  //{{AFX_MSG(CAboutDlg) /MtmO$ .  
  //}}AFX_MSG [~N;d9H+*1  
  DECLARE_MESSAGE_MAP() =RWTjTZ   
}; W^iK9|[qp  
&%fcGNzJQ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) CA#g(SiZ  
{ ^{"i eVn  
 //{{AFX_DATA_INIT(CAboutDlg) eC5*Q=ai,  
 //}}AFX_DATA_INIT ZSu.0|0#  
} z)T-<zWO;  
qy|bOl  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) {\5(aQ)Vi5  
{ [ K?  
 CDialog::DoDataExchange(pDX); StJb-K/_cL  
 //{{AFX_DATA_MAP(CAboutDlg) -`' |z+V  
 //}}AFX_DATA_MAP 8;gi8Y  
} 4<[?qd 3v=  
; $rQ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4r$#-  
 //{{AFX_MSG_MAP(CAboutDlg) xVPSL#>  
 // No message handlers w>2lG3H<  
 //}}AFX_MSG_MAP ]y {tMC  
END_MESSAGE_MAP() :la i0> D  
2E40&  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/)  /!ElAL  
: CDialog(CCaptureDlg::IDD, pParent) >7BP}5`.;  
{ 30HUY?'K  
 //{{AFX_DATA_INIT(CCaptureDlg) A"S"La%"  
  m_bControl = FALSE; Owf!dMA;nF  
  m_bAlt = FALSE; W|2^yO,dX  
  m_bShift = FALSE; VV Q~;{L  
  m_Path = _T("c:\\"); Fizrsr 6%  
  m_Number = _T("0 picture captured."); ;"&?Okz  
  nCount=0; %<kfW&_>w  
  bRegistered=FALSE; {jD?obs  
  bTray=FALSE; |it*w\+M  
 //}}AFX_DATA_INIT >Cr"q*  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 +c_AAMe  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); s{dm,|?Jl,  
} <pk*z9   
[j@ek  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) A}Iyl   
{ E6GubU  
 CDialog::DoDataExchange(pDX); <qR$ `mLN  
 //{{AFX_DATA_MAP(CCaptureDlg) !IOmJpl'  
  DDX_Control(pDX, IDC_KEY, m_Key); 6Y2,fW8i,  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); )?[2Y%P  
  DDX_Check(pDX, IDC_ALT, m_bAlt); L9/'zhiZBx  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); )FwOg;=3M"  
  DDX_Text(pDX, IDC_PATH, m_Path); 9we];RYK  
  DDX_Text(pDX, IDC_NUMBER, m_Number); w}1IP-  
 //}}AFX_DATA_MAP <l1/lm<#  
} `:lcN0n  
7Q/H+)  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) \y7?w*K  
//{{AFX_MSG_MAP(CCaptureDlg) \!-]$&,j4  
 ON_WM_SYSCOMMAND() !po,Z&  
 ON_WM_PAINT() Mh`^-*c?  
 ON_WM_QUERYDRAGICON() #:" ]-u^  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) #w L(<nE  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) I0Do%  
 ON_BN_CLICKED(ID_CHANGE, OnChange) p+P@I7V  
//}}AFX_MSG_MAP n`= S&oKH  
END_MESSAGE_MAP() ^U~Er'mT  
4AhF E@  
BOOL CCaptureDlg::OnInitDialog() aKMX-?%t4  
{ `G":y[Q  
 CDialog::OnInitDialog(); \zJ^XpC  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ^:?z7m  
 ASSERT(IDM_ABOUTBOX < 0xF000); ?e-rwaW  
 CMenu* pSysMenu = GetSystemMenu(FALSE); SsX$l<t*  
 if (pSysMenu != NULL) _,^f,WO~  
 { F-@y H  
  CString strAboutMenu; GYw/KT~$  
  strAboutMenu.LoadString(IDS_ABOUTBOX); u|23M,  
  if (!strAboutMenu.IsEmpty()) 8!v|`Ky  
  { 6No.2Oo  
   pSysMenu->AppendMenu(MF_SEPARATOR); tgBA(2/Co  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); n^QDMyC;I  
  } @d Qr^'h  
 } M}jl \{  
 SetIcon(m_hIcon, TRUE); // Set big icon TJP;!uX  
 SetIcon(m_hIcon, FALSE); // Set small icon 7h9oY<W  
 m_Key.SetCurSel(0); T2-x1Sw_  
 RegisterHotkey(); ?Ho$fGz  
 CMenu* pMenu=GetSystemMenu(FALSE); fXevr `  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); h`fZ 8|yw  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); "Io-%S u+  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); NTJ,U2  
 return TRUE; // return TRUE unless you set the focus to a control  ~@@t-QY  
} F@/syX;bb5  
TJ>YJ D  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) J>dj]1I  
{ e77s?WxbK  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) W9cvxsox  
 { Nj6Np^@sH  
  CAboutDlg dlgAbout; p,WBF  
  dlgAbout.DoModal(); L,_U co  
 } -C^qN7Bz  
 else .~'q yD2V  
 { Ge$&k  
  CDialog::OnSysCommand(nID, lParam); NO*~C',cI/  
 } _)-2h[  
} &\?{%xj  
 UDpI @  
void CCaptureDlg::OnPaint() J'cE@(US  
{ .WOF:Nu4  
 if (IsIconic()) IwFf8? 3  
 { M-Nn \h$,  
  CPaintDC dc(this); // device context for painting KI<x`b  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); f`8fNt  
  // Center icon in client rectangle z=k*D^X  
  int cxIcon = GetSystemMetrics(SM_CXICON); ZbH6$2r  
  int cyIcon = GetSystemMetrics(SM_CYICON); D622:Y886  
  CRect rect; Zo-Au  
  GetClientRect(&rect); zh !/24p9  
  int x = (rect.Width() - cxIcon + 1) / 2; JmF`5  
  int y = (rect.Height() - cyIcon + 1) / 2; K~L"A]+  
  // Draw the icon @TKQ_7BcB  
  dc.DrawIcon(x, y, m_hIcon); 7({.kD6  
 } =L$RY2S"  
 else "z.!h(Eq  
 { y^p%/p%  
  CDialog::OnPaint(); 17Q* <iCs  
 } j@Us7Q)A(  
} nkkGJV!  
suj}A  
HCURSOR CCaptureDlg::OnQueryDragIcon() jaThS!>v  
{ t[%=[pJHW  
 return (HCURSOR) m_hIcon; fZd~},X  
} :+DAzjwO<  
:?%_JM5U  
void CCaptureDlg::OnCancel() DF#WQ8?$]  
{ 9 DXu*}  
 if(bTray) ]:^kw$  
  DeleteIcon(); d@|j>Z  
  CDialog::OnCancel(); '9wD+'c=A  
} S4O:?^28  
>|T?87  
void CCaptureDlg::OnAbout() =7P; /EV  
{ /=OSGIJzm  
 CAboutDlg dlg; `~t$k7wm=  
 dlg.DoModal(); N~arxe (K  
} qj|B #dU  
E{9{%J  
void CCaptureDlg::OnBrowse() YpZ 9h@,  
{ 4d'tK^X  
 CString str; Q;$/&Y*  
 BROWSEINFO bi; ZoC?9=k  
 char name[MAX_PATH]; ;Wr,VU]  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); q14A 'XW  
 bi.hwndOwner=GetSafeHwnd(); UE\@7  
 bi.pszDisplayName=name; ]*;+ U6/?  
 bi.lpszTitle="Select folder"; "=!QSb  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; {&(bKQ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ]O&A:Us  
 if(idl==NULL) Ip0@Q}^  
  return; 'E8dkVlI  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); OEGAwP?F  
 str.ReleaseBuffer(); oB Bdk@  
 m_Path=str; 5p{tt;9[  
 if(str.GetAt(str.GetLength()-1)!='\\') s: q15"  
  m_Path+="\\"; m9>nv rQ  
 UpdateData(FALSE); qXW2a'~  
} 2|w.A!  
u&I~%s  
void CCaptureDlg::SaveBmp() ~(0Y`+gC  
{ j'0*|f^z  
 CDC dc; /0YNB)  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ! xqG-rd '  
 CBitmap bm; R QO{fC  
 int Width=GetSystemMetrics(SM_CXSCREEN); NtOR/*  
 int Height=GetSystemMetrics(SM_CYSCREEN); 3yD5u  
 bm.CreateCompatibleBitmap(&dc,Width,Height); !%M-w0vC9  
 CDC tdc; 1aMBCh<}JN  
 tdc.CreateCompatibleDC(&dc); |QgXSe7  
 CBitmap*pOld=tdc.SelectObject(&bm); ;%z0iZmg  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 0Rk'sEX,  
 tdc.SelectObject(pOld); 01q7n`o#zf  
 BITMAP btm; @%cJjZ5y  
 bm.GetBitmap(&btm); s3kEux^  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; gZ!(&u  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); x!.VWGtb  
 BITMAPINFOHEADER bih;  FZ2-e  
 bih.biBitCount=btm.bmBitsPixel; (&hX8  
 bih.biClrImportant=0; qK1V!a2  
 bih.biClrUsed=0; >a-+7{};  
 bih.biCompression=0; `y6l^ep  
 bih.biHeight=btm.bmHeight; ez5`B$$  
 bih.biPlanes=1; ?H c A&  
 bih.biSize=sizeof(BITMAPINFOHEADER); 246lFx G.  
 bih.biSizeImage=size; =L wX+c  
 bih.biWidth=btm.bmWidth; Oc'z?6axWv  
 bih.biXPelsPerMeter=0; o5$K^2^g  
 bih.biYPelsPerMeter=0; D\l.?<C  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _0j}(Q>|H#  
 static int filecount=0; S+>]8ZY  
 CString name; x)yf!Dv5$  
 name.Format("pict%04d.bmp",filecount++); |f}NO~CA  
 name=m_Path+name; &lS0"`J=  
 BITMAPFILEHEADER bfh; RK3/!C`  
 bfh.bfReserved1=bfh.bfReserved2=0; X5/{Mx`8Oz  
 bfh.bfType=((WORD)('M'<< 8)|'B'); coFg69\^  
 bfh.bfSize=54+size; O`0$pn  
 bfh.bfOffBits=54; x[^A9  
 CFile bf; 4K;j:ZJ"x  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ry]7$MQyV  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); v#+w<gRq  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Y-c~"#  
  bf.WriteHuge(lpData,size); )Z%+~n3o'  
  bf.Close(); ipp_?5TL  
  nCount++; KE3 /<0Z  
 } 1=a}{)0h  
 GlobalFreePtr(lpData); TxCQGzqe  
 if(nCount==1) k"7eHSy,  
  m_Number.Format("%d picture captured.",nCount); 4vQHr!$Ep  
 else Y)*lw  
  m_Number.Format("%d pictures captured.",nCount); ZAH<!@qh  
  UpdateData(FALSE); U?lu@5 ^Z  
} O]g+z$2o  
enzQ}^  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) eztk$o  
{ B;~agr  
 if(pMsg -> message == WM_KEYDOWN) _Lb& 2 PAG  
 { *pD;AU  
  if(pMsg -> wParam == VK_ESCAPE) `^ _:  
   return TRUE; @Kr)$F  
  if(pMsg -> wParam == VK_RETURN) `k| nf9_  
   return TRUE; `s_TY%&_}g  
 } QMxz@HGa|  
 return CDialog::PreTranslateMessage(pMsg); a*[\edcHU  
} uRy6~'  
|)-:w?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) UQcmHZ+lf  
{ V6{xX0'b*m  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ c6m,oS^  
  SaveBmp(); w;$+7  
  return FALSE; qU n>  
} feW9 >f;  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ bN&da [K  
 CMenu pop; *a%PA(%6  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ,s76]$%4  
 CMenu*pMenu=pop.GetSubMenu(0); Q8q_w2s,  
 pMenu->SetDefaultItem(ID_EXITICON); Pvw%,=41O  
 CPoint pt; S%fBt?-Cm  
 GetCursorPos(&pt); 7dJaWD:&   
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); B~#@fIL  
 if(id==ID_EXITICON) y)E2=JQA/  
  DeleteIcon(); G]1pGA;  
 else if(id==ID_EXIT) %nh'F6bNgv  
  OnCancel(); R4(8]oUW  
 return FALSE; /6c10}f  
} P[K=']c  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); m^.C(}  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) %p60pn[(  
 AddIcon(); 1F,_L}=o1s  
 return res; y21uvp'  
} &zcj U+n  
SXz([Z{)  
void CCaptureDlg::AddIcon() \pGO}{3 e*  
{ Z5[:Zf?h7J  
 NOTIFYICONDATA data; ;/T-rVND  
 data.cbSize=sizeof(NOTIFYICONDATA); ,-Nk-g  
 CString tip; <R>ZG"m{  
 tip.LoadString(IDS_ICONTIP); BD-=y  
 data.hIcon=GetIcon(0); K:@=W1  
 data.hWnd=GetSafeHwnd(); I}IW!K  
 strcpy(data.szTip,tip); 2QRn c"  
 data.uCallbackMessage=IDM_SHELL; |=T<WU1$  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; q*nz4QTOE  
 data.uID=98; W@dY:N}  
 Shell_NotifyIcon(NIM_ADD,&data); UJ$:5*S=u  
 ShowWindow(SW_HIDE); r&sOM_BUF  
 bTray=TRUE; Q$L(fH kw  
} 8Jj0-4]  
3]es$Jy  
void CCaptureDlg::DeleteIcon() ]?`p_G3O  
{ x 4</\o  
 NOTIFYICONDATA data; F5MPy[  
 data.cbSize=sizeof(NOTIFYICONDATA); 9lJj/  
 data.hWnd=GetSafeHwnd(); \=_q{  
 data.uID=98; ^(*O$N*#  
 Shell_NotifyIcon(NIM_DELETE,&data); ha! "BR  
 ShowWindow(SW_SHOW); 9 /(c cj  
 SetForegroundWindow(); D#1~]d  
 ShowWindow(SW_SHOWNORMAL); 1T,PC?vr{  
 bTray=FALSE; by[i"!RCu  
} i%4k5[f.:  
-z$2pXT ^  
void CCaptureDlg::OnChange() HbfB[%  
{ a BH1J]_  
 RegisterHotkey(); S{T d/1}  
} jY+S,lD  
,GU/l)os`  
BOOL CCaptureDlg::RegisterHotkey() b|o!&9Yyr  
{ TeCpT2!5j  
 UpdateData(); .<^Y E%  
 UCHAR mask=0; /'fDXSdP  
 UCHAR key=0; {WeXURp&nF  
 if(m_bControl) `lezJ (Xm  
  mask|=4; s[@>uP  
 if(m_bAlt) 2\B9o `Y  
  mask|=2; A=d$ir K[  
 if(m_bShift) 5qkuK F  
  mask|=1; lV6[d8P  
  key=Key_Table[m_Key.GetCurSel()]; 0uO=wOIhH  
 if(bRegistered){ WAXts]=  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Wd56B+  
  bRegistered=FALSE; 1 3 `0d  
 } e)dWa'2<  
 cMask=mask; D8AIV K]  
 cKey=key; !LOors za  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); g^$11  
 return bRegistered; 33'lZ ubV  
} D#Yx,`Ui  
Ij}F<ZgZG  
  四、小结 t`YZ)>Ws  
aC~n:0 v  
  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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