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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: f6m^pbQFl  
  2/;KZ+U&  
  一、实现方法 P017y&X  
r2Q"NVw  
  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: jReI+ pS  
eQ*gnV}rE%  
#pragma data_seg("shareddata") /aK },+  
HHOOK hHook =NULL; //钩子句柄 4TLh'?Xu9  
UINT nHookCount =0; //挂接的程序数目 i}q6^;uTF  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ,@P3!|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ] 03!K E  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey `dj/Uk  
static int KeyCount =0; _ p?q/-[4  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 M5<5 (l  
#pragma data_seg() rp _G.C  
X=DJOepH'  
  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。 L\b$1U!i  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: '8}\! i&  
=B; )h  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR M HgS5b2  
cKey,UCHAR cMask) ^m5{:\ Xk  
{  1 ft. ZJ  
 BOOL bAdded=FALSE; "e_ED*  
 for(int index=0;index<MAX_KEY;index++){ v+\E%H  
  if(hCallWnd[index]==0){ OyH:  
   hCallWnd[index]=hWnd; UboOIx5:  
   HotKey[index]=cKey; *EotYT  
   HotKeyMask[index]=cMask;  6E  
   bAdded=TRUE; s&c^Wr  
   KeyCount++; Jcy`:C\Ay  
   break; !x,3k\M  
  } AKS(WNGEp  
 } -5E<BmM  
 return bAdded; %``FIv15w  
} `E}2|9  
//删除热键 ']qC,;2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `_f3o,5  
{ H#1/H@I#  
 BOOL bRemoved=FALSE; C#gQJ=!B  
 for(int index=0;index<MAX_KEY;index++){ ~>C!l k  
  if(hCallWnd[index]==hWnd){ EmLPq!C  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )>=`[$D1t  
    hCallWnd[index]=NULL; hwexv 9""  
    HotKey[index]=0; #!<x|N?_<  
    HotKeyMask[index]=0; u'=#~'6  
    bRemoved=TRUE; SK-|O9Ki  
    KeyCount--; & ??)gMM[  
    break; t[#`%$% '  
   } 1pcSfN:"1  
  } Muarryh}  
 } ~)()PO  
 return bRemoved; )hn,rmn (P  
} ,@<-h* m  
}3+q}_3  
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  DLL中的钩子函数如下: z muq4-.  
U;;Har   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Qi[T!1  
{ .%*.nq  
 BOOL bProcessed=FALSE; C@KYg/nYw  
 if(HC_ACTION==nCode) S_\RQB\l  
 { RzyEA3L'  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 .}Xkr+ +]  
   switch(wParam) 8y+Gvk:  
   {  /Fk0j_b  
    case VK_MENU: 'W$qi@f_s  
     MaskBits&=~ALTBIT; (L~3nN;rr  
     break; NeNKOW#X  
    case VK_CONTROL: ;1"K79  
     MaskBits&=~CTRLBIT; >0512_J+  
     break; T nPC\.x  
    case VK_SHIFT: .&* Tj}p  
     MaskBits&=~SHIFTBIT; KnbP@!+c  
     break; u |#ruFR  
    default: //judge the key and send message vnIxI a  
     break; J :,  
   } DrW]`%Ql  
   for(int index=0;index<MAX_KEY;index++){ FxD"z3D  
    if(hCallWnd[index]==NULL) H4%wq  
     continue; 0{Tf;a<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) FmnA+fA  
    { xv1$,|^ts  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $'e.bh  
     bProcessed=TRUE; QO|ODW+D  
    } -'ZP_$sA  
   } |QHWX^pO  
  } % 3FI>\3  
  else if((lParam&0xc000ffff)==1){ //有键按下 !3Pl]S~6!  
   switch(wParam) {\ .2h  
   { 2b!b-  
    case VK_MENU: ib& |271gG  
     MaskBits|=ALTBIT; Q>||HtF$A  
     break; &M<431y  
    case VK_CONTROL: 1f~_# EIC  
     MaskBits|=CTRLBIT; 6Q\n<&,{  
     break; 9#_49euy|P  
    case VK_SHIFT: QI!:+8  
     MaskBits|=SHIFTBIT; {x-g?HB  
     break; j^LnHVHk1  
    default: //judge the key and send message Xst&QKU  
     break; 4CNK ]2  
   } i3f/{D/  
   for(int index=0;index<MAX_KEY;index++){ 6g$+))g  
    if(hCallWnd[index]==NULL) yQ&;#`!'  
     continue; t6~|T_]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) s'/ug  
    { 64zO%F*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &(wik#S  
     bProcessed=TRUE; d'DS7F(c{  
    } UY>{e>/H9  
   } 783a Z8  
  } ,/Xxj\i  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 pvcf_w`n  
   for(int index=0;index<MAX_KEY;index++){ 1OJ:Vy}n  
    if(hCallWnd[index]==NULL) t6LTGWs/_o  
     continue; v3`J~,V<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) "zm.jNn  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); A(<- U|  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 > a^H7kp  
   } bp5hS/A^1w  
  } mA{gj[@:x  
 } na%9E8;:&v  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); pW!]  
} ' Bdvqq  
zYH6+!VBH#  
  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: `SOaQ|H  
p61"a,Xc  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x~KS;hA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); I /RvU,  
(A"oMnjWd  
  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: vW~_+:),e  
r?H {Y3 ,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4?8GK  
{ )v'3pTs2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) DfqXw^BKD  
 { m@"!=CTKd  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 1eK J46W  
  SaveBmp(); e?F r/n  
  return FALSE; X/'B*y'=U  
 } 5MiWM2"X\  
 …… //其它处理及默认处理 LgB}!OLQ  
} i"U3wt |A  
R:OoQ^c  
yp!Xwq#n  
  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。 ?p\'S w:  
P`RM"'Om  
  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。 GAPZt4Z2  
A.y"R)G  
  二、编程步骤 7!Fu.Ps >  
v82@']IN  
  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"; OhIUm4=|$  
j^:\a\-1  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 3",6 E(  
aiUn bP  
  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; `\#Q r|GC  
[NC^v.[1[  
  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; \5X34'7   
V$^x]z  
  5、 添加代码,编译运行程序。 [gD02a: u  
T,jxIFrF  
三、程序代码 %_} #IS1  
0wxQ,PI1'  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL vzy/Rq  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) IHf A;&b  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ZH/|L?Q1U  
#if _MSC_VER > 1000 XBi@\i=  
#pragma once vR#A7y @ !  
#endif // _MSC_VER > 1000 Cf8(J k`v|  
#ifndef __AFXWIN_H__ $eI[3{}X  
#error include 'stdafx.h' before including this file for PCH Jd/ 5Kx  
#endif ]uj H7T  
#include "resource.h" // main symbols 4AUY8Pxp  
class CHookApp : public CWinApp FL0[V,  
{ ])0&el3-  
 public: @4hxGk=  
  CHookApp(); *$uKg zv3  
  // Overrides ^8E/I]-  
  // ClassWizard generated virtual function overrides P0UMMn\-#  
  //{{AFX_VIRTUAL(CHookApp) awo=%vJ&  
 public: | u36-  
  virtual BOOL InitInstance(); mrk Q20D  
  virtual int ExitInstance(); 3^ wJ4=^  
  //}}AFX_VIRTUAL 6lsU/`.  
  //{{AFX_MSG(CHookApp) )Z"7^ i  
  // NOTE - the ClassWizard will add and remove member functions here. k' pu%nWN  
  // DO NOT EDIT what you see in these blocks of generated code ! h&.9Q{D  
  //}}AFX_MSG w QwY_ _  
  DECLARE_MESSAGE_MAP() N4'b]:`n  
}; 67Ge}6*2pd  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); hF!yp7l;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); mn4j#-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); h jW RU#  
BOOL InitHotkey(); pLrNYo*d  
BOOL UnInit(); S\GG(#b!  
#endif 'j>^L  
90teXxg=|  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. P?\rRB  
#include "stdafx.h" cXtL3T+  
#include "hook.h" Xs*~ [k'  
#include <windowsx.h> Mx0c # d.  
#ifdef _DEBUG ^:LF  
#define new DEBUG_NEW r'w5i1C+  
#undef THIS_FILE Zo'lvOpyZ  
static char THIS_FILE[] = __FILE__; ?RrJYj1  
#endif ?9 2+(s  
#define MAX_KEY 100 C n4|qX"&t  
#define CTRLBIT 0x04 K\=bpc"Fy  
#define ALTBIT 0x02 bbS'ZkB\  
#define SHIFTBIT 0x01 > aN@)=h}  
#pragma data_seg("shareddata") eGtIVY/D  
HHOOK hHook =NULL; < _c84,[V  
UINT nHookCount =0; 6'|J ;  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey +oe ~j\=  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT S &cH1QZ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ?Q:se  
static int KeyCount =0; /vSFQ}W  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift vqv(KsD+::  
#pragma data_seg() >PL/>   
HINSTANCE hins; |M0 XLCNd_  
void VerifyWindow(); g oWD~'\  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) RhX 2qsva-  
//{{AFX_MSG_MAP(CHookApp) TDy@Y> )  
// NOTE - the ClassWizard will add and remove mapping macros here. li,kW`j+t  
// DO NOT EDIT what you see in these blocks of generated code! eAm7*2  
//}}AFX_MSG_MAP l&U3jeW-o  
END_MESSAGE_MAP() eHd{'J<  
Q Gn4AW_  
CHookApp::CHookApp() oKzV!~{0M;  
{ hTH"jAC+  
 // TODO: add construction code here, >-EoE;s  
 // Place all significant initialization in InitInstance DlfXzKn;  
} /8J2,8vZ  
SJIJV6}H  
CHookApp theApp; 9S.R%2xw`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) kZSe#'R's  
{ K#+TCZ,  
 BOOL bProcessed=FALSE; ~F uD6f  
 if(HC_ACTION==nCode) LP#CA^*S  
 { 8t0i j  
  if((lParam&0xc0000000)==0xc0000000){// Key up "x3_cA~  
   switch(wParam) [Z~>7ayF+)  
   { ^EZ)NG=e5  
    case VK_MENU: r3p fG  
     MaskBits&=~ALTBIT; w[:5uo(  
     break; ra$_#HY  
    case VK_CONTROL: tJ2l_M^  
     MaskBits&=~CTRLBIT; 69O?sIk  
     break; <$,i Yx   
    case VK_SHIFT: 8t9sdqM/C  
     MaskBits&=~SHIFTBIT; \`|,wLgH  
     break; r(%#@?&  
    default: //judge the key and send message ax7u b  
     break; :t^=~xO9  
   } F2 >o"j2  
   for(int index=0;index<MAX_KEY;index++){ |) T HuE(  
    if(hCallWnd[index]==NULL) G'}%m;-mt  
     continue; |;9OvR> A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2!{CNt.-  
    { [@Uc4LX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); t~,!a?S7  
     bProcessed=TRUE; Kze\|yJ  
    } {K_YW  
   } TS-m^Y'R  
  } mY dU`j  
  else if((lParam&0xc000ffff)==1){ //Key down }5zH3MPQH  
   switch(wParam) cf@:rHB}  
   { h#;fBQ]   
    case VK_MENU: 7-6_`Q2}Y  
     MaskBits|=ALTBIT; $?wX*  
     break; #^xiv/ sV  
    case VK_CONTROL: ~wh8)rm  
     MaskBits|=CTRLBIT; Ca?pK_Y  
     break; AO>K 6{  
    case VK_SHIFT: _EjS(.e/=  
     MaskBits|=SHIFTBIT; /`:5#O  
     break; _pjpPSV6J  
    default: //judge the key and send message s:wLEj+  
     break; cg$7`/U  
   } @iao"&  
   for(int index=0;index<MAX_KEY;index++) ]5rEwPB  
   { {3 zq.e{  
    if(hCallWnd[index]==NULL) EC?!%iO`  
     continue; 4)Z78H%>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %w' @:~0  
    { S WYiI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +!.=M8[  
     bProcessed=TRUE; "4n_MV>p  
    } 5x4(5c5^  
   } 8%vk"h:u:  
  } 1fEV^5I  
  if(!bProcessed){ V"T;3@N/4  
   for(int index=0;index<MAX_KEY;index++){ .CwMxuW  
    if(hCallWnd[index]==NULL) vV8 y_  
     continue; kmo3<'j{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {jggiMwo.v  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {IqbO>|"O_  
   } k@KX=mG<  
  } (fY(-  
 } 6Dw[n   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~;Xdz/  
} rf^1%Zo:  
1 9;\:tN  
BOOL InitHotkey() GJ{]}fl  
{ qo$<&'r  
 if(hHook!=NULL){ o)Ob}j  
  nHookCount++; `Z/"Dd;F^3  
  return TRUE; 1mf|:2,  
 } vIz~B2%x  
 else J} %&;uv  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); HQv#\Xi1  
  if(hHook!=NULL) M6y:ze  
   nHookCount++; "d%":F(  
  return (hHook!=NULL); Y7!,s-v4W  
} a;([L8^7$l  
BOOL UnInit() 'OkF.bs  
{ CW, Kw  
 if(nHookCount>1){ 6 )xm?RK  
  nHookCount--; spd>.Cm`  
  return TRUE; Y~fds#y0  
 } S(9fGh  
 BOOL unhooked = UnhookWindowsHookEx(hHook); =;^2#UxXA&  
 if(unhooked==TRUE){ ]7c715@  
  nHookCount=0; e @=Bl-  
  hHook=NULL; } Tp!Ub\Cc  
 } kAf2g  
 return unhooked; )6IO)P/Q~  
} WAkKbqJV  
mA3C)V  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *jf (TIU  
{ ~H)bvN^  
 BOOL bAdded=FALSE; 3ef]3  
 for(int index=0;index<MAX_KEY;index++){ 8;Yx a8ie  
  if(hCallWnd[index]==0){ c KF 8(  
   hCallWnd[index]=hWnd; 4}fG{Bk  
   HotKey[index]=cKey; o D:?fs]  
   HotKeyMask[index]=cMask; \BUr2]  
   bAdded=TRUE; L[Tr"BW  
   KeyCount++; !XzRV?Ih;  
   break; R9fM9  
  } /R 2:Js  
 } oy#Qj3M8=  
 return bAdded; wGLZzqgq  
} PL%_V ?z  
nuhKM.a{  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |;Jcf3e(  
{ NC@OmSR\0  
 BOOL bRemoved=FALSE; z.P) :Er  
 for(int index=0;index<MAX_KEY;index++){ v\0[B jhL?  
  if(hCallWnd[index]==hWnd){ W[w8@OCNf  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^5j9WV  
    hCallWnd[index]=NULL; |c dQJW  
    HotKey[index]=0; F0+u#/#  
    HotKeyMask[index]=0; ]"{K5s7  
    bRemoved=TRUE; iS=} | 8"  
    KeyCount--; 4CfPa6_  
    break; }(20MW8rMc  
   } ^'6!)y#  
  } yC6XO&:g  
 } 9q;+ Al^Z  
 return bRemoved; r Fdq \BSi  
} wUW+S5"K  
'SvYZ0ot  
void VerifyWindow() 5Y_)%u  
{ %0$$tS +  
 for(int i=0;i<MAX_KEY;i++){  K7 U`  
  if(hCallWnd!=NULL){ Fl<BCJY  
   if(!IsWindow(hCallWnd)){  ()=  
    hCallWnd=NULL; q %8,@xg  
    HotKey=0; r;I 3N+  
    HotKeyMask=0; .KXpB7:  
    KeyCount--; jrZM  
   } IbF[nQ  
  } Mm+_>   
 } 50Pz+:  
} |SQ5Sb  
Et4gRS)\  
BOOL CHookApp::InitInstance() >Vn;1|w  
{ shj S^CP  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); gGH<%nHW1  
 hins=AfxGetInstanceHandle(); 7b \HbgZ  
 InitHotkey(); aXhgzI5]  
 return CWinApp::InitInstance(); ]B5qv6  
} ?b:l.0m  
egK,e?~  
int CHookApp::ExitInstance() aOA;"jR1  
{ +tES:3Pi  
 VerifyWindow(); =Y?M#3P.I  
 UnInit(); nO,<`}pV  
 return CWinApp::ExitInstance(); _<yJQ|[z~i  
} 'k{pWfn=<  
8{(;s$H~  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file p4*VE5[?_+  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) o} YFDYi  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ |!aMj8i2  
#if _MSC_VER > 1000 Jp=ur)Dj  
#pragma once E,>/6AU  
#endif // _MSC_VER > 1000 VSL6tQp  
"U4Sn'&h@  
class CCaptureDlg : public CDialog 4b,N"w{v  
{ {%)bxk6  
 // Construction fnN"a Z  
 public: )apqL{u:=  
  BOOL bTray; -;Y*;xe  
  BOOL bRegistered; c7[|x%~  
  BOOL RegisterHotkey(); C;-9_;&  
  UCHAR cKey; 7D|g|i  
  UCHAR cMask; )k.;.7dXe  
  void DeleteIcon(); b$l@Z&[]  
  void AddIcon(); +DY% Y `0  
  UINT nCount; %D)W~q-g  
  void SaveBmp(); nNSq6 Cj  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor soRt<83  
  // Dialog Data _%?}e|epy  
  //{{AFX_DATA(CCaptureDlg) '+hiCX-_  
  enum { IDD = IDD_CAPTURE_DIALOG }; qfd/t<?|D  
  CComboBox m_Key; v2 T+I]I  
  BOOL m_bControl; Q"h/o"-h  
  BOOL m_bAlt; 2,{m>fF  
  BOOL m_bShift; ypSW9n  
  CString m_Path; Mm;kB/ 1  
  CString m_Number; Jlj=FA`  
  //}}AFX_DATA %oJ_,m_(  
  // ClassWizard generated virtual function overrides se:]F/  
  //{{AFX_VIRTUAL(CCaptureDlg) /bjyV]N  
 public: 5Q;Fwtm  
  virtual BOOL PreTranslateMessage(MSG* pMsg); e23}'qb  
 protected: $-Lk,}s.*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support zWb>y  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); n ,!PyJ  
  //}}AFX_VIRTUAL KB0 HM  
  // Implementation 8 2nQ]  
 protected: AcqsXBKd  
  HICON m_hIcon; O(2)A>}  
  // Generated message map functions -NHA{?6r  
  //{{AFX_MSG(CCaptureDlg) _DnZ=&=MA  
  virtual BOOL OnInitDialog(); <5%x3e"7u  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); jQxv` H  
  afx_msg void OnPaint(); {*RyT.J  
  afx_msg HCURSOR OnQueryDragIcon(); .]SE>3  
  virtual void OnCancel(); :P1 J>dcG  
  afx_msg void OnAbout(); _z4c7_H3  
  afx_msg void OnBrowse(); ]vo&NE  
  afx_msg void OnChange(); OSY$qL2  
 //}}AFX_MSG +&6R(7XC  
 DECLARE_MESSAGE_MAP() hsr,a{B%$  
}; LmE%`qNg  
#endif vq-Tq>  
]:uJ&xUar  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file _Q_"_*e  
#include "stdafx.h" D[yOFJ~p)  
#include "Capture.h" j qfxQ  
#include "CaptureDlg.h" .Zv@iL5  
#include <windowsx.h> %C^U?m`  
#pragma comment(lib,"hook.lib") :Q@=;P2  
#ifdef _DEBUG FR"yGx#$  
#define new DEBUG_NEW `irz'/"p  
#undef THIS_FILE }F=scbpXj  
static char THIS_FILE[] = __FILE__; r`Y[XzT9  
#endif M S$^m2  
#define IDM_SHELL WM_USER+1 ByqB4Hv2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); wqEO+7)S  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p uEu v6F  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; fTQRn  
class CAboutDlg : public CDialog ^Tgu]t   
{ dF$a52LS  
 public: lO&TSPD^  
  CAboutDlg(); Eh/B[u7T[  
  // Dialog Data kcGs2Y_*&  
  //{{AFX_DATA(CAboutDlg) xF![3~~3[  
  enum { IDD = IDD_ABOUTBOX }; =aR'S\<  
  //}}AFX_DATA BV_rk^}Ur  
  // ClassWizard generated virtual function overrides AJ1(q:P  
  //{{AFX_VIRTUAL(CAboutDlg) 0~ !).f  
 protected: lJ1_Zs `  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Z Z|a`U  
  //}}AFX_VIRTUAL JDeG@N$  
  // Implementation hUN]Lm6M  
 protected: Z7>pz:,  
  //{{AFX_MSG(CAboutDlg) E_k<EQ%r  
  //}}AFX_MSG LE#ko2#ke  
  DECLARE_MESSAGE_MAP() mhU ?N  
}; U\dq Mp#Wy  
{8`V5:  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) D_mdX9-~  
{ U-!+Cxjs  
 //{{AFX_DATA_INIT(CAboutDlg) 8s^CE[TA  
 //}}AFX_DATA_INIT l-4+{6lz  
} qYjR  
AT*J '37  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 7 L2$(d4  
{ V/xGk9L~  
 CDialog::DoDataExchange(pDX); eFJ .)Z  
 //{{AFX_DATA_MAP(CAboutDlg) )%H@.;cD_r  
 //}}AFX_DATA_MAP @ )nxX))a  
} =*<Cw?Gc  
m?wPZ^u  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) vU= +  
 //{{AFX_MSG_MAP(CAboutDlg) O_-Lm4g?4  
 // No message handlers eb%`ox@&  
 //}}AFX_MSG_MAP 5M6`\LyU  
END_MESSAGE_MAP() %A_h!3f&  
)lB 3U  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ffDh 0mDN  
: CDialog(CCaptureDlg::IDD, pParent) wyG7SA   
{ G?Fqm@J{XT  
 //{{AFX_DATA_INIT(CCaptureDlg) -!w({rP  
  m_bControl = FALSE; qI (<5Wxl  
  m_bAlt = FALSE; :K J#_y\rt  
  m_bShift = FALSE; ;;|S QX  
  m_Path = _T("c:\\"); R<wPO-dX  
  m_Number = _T("0 picture captured."); BCUn[4Gp  
  nCount=0; e\o>(is  
  bRegistered=FALSE; -36pkC 6 \  
  bTray=FALSE; L>:YGM"sL  
 //}}AFX_DATA_INIT D3,9X#B=  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 fH{ _X  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 5ZpU><y  
} abAX)R'  
W:5,zFW  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) l6kqP  
{ )g;*u,C  
 CDialog::DoDataExchange(pDX); )P>-~G2P  
 //{{AFX_DATA_MAP(CCaptureDlg) Rb!V{jQ  
  DDX_Control(pDX, IDC_KEY, m_Key); pCOtk'n  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); MLVrL r t  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 1dsMmD[O  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); $Sg5xkV,a  
  DDX_Text(pDX, IDC_PATH, m_Path); E(%_aFx>/  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 9:[L WT&  
 //}}AFX_DATA_MAP 6d%V=1^F  
} M^C|svm  
4o|-v  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) VH*4fcT'D  
//{{AFX_MSG_MAP(CCaptureDlg) T-.Q  
 ON_WM_SYSCOMMAND() CSu}_$wC#  
 ON_WM_PAINT() Obj?,O  
 ON_WM_QUERYDRAGICON() =H8 LBM  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) }fqz8'E9  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) CGYZEPRR  
 ON_BN_CLICKED(ID_CHANGE, OnChange) hzR1O(  
//}}AFX_MSG_MAP 2^3N[pM;  
END_MESSAGE_MAP() (j>a?dKDS  
XXwe/>J  
BOOL CCaptureDlg::OnInitDialog() mT:Z!sS  
{ "~:AsZ"7  
 CDialog::OnInitDialog(); <4{Jm8zJ  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); uC2-T5n'  
 ASSERT(IDM_ABOUTBOX < 0xF000); G&7!3u  
 CMenu* pSysMenu = GetSystemMenu(FALSE); qHQWiu% h  
 if (pSysMenu != NULL) ;^yR,32F  
 { 4 C7z6VWg  
  CString strAboutMenu; LN!e_b  
  strAboutMenu.LoadString(IDS_ABOUTBOX); V1h&{D\"  
  if (!strAboutMenu.IsEmpty()) o$4xinK  
  { )P|&o%E  
   pSysMenu->AppendMenu(MF_SEPARATOR); tV'>9YVdG  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);  F0i`HO{  
  } A3su!I2S  
 } *PSUB{i(  
 SetIcon(m_hIcon, TRUE); // Set big icon ~d.Z. AD  
 SetIcon(m_hIcon, FALSE); // Set small icon qL;T^ljP  
 m_Key.SetCurSel(0); =PQMd  
 RegisterHotkey(); ;1gWz  
 CMenu* pMenu=GetSystemMenu(FALSE); {D>@ZC  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); EklcnM|6  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); bxXNv^  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); s+omCr|H;A  
 return TRUE; // return TRUE unless you set the focus to a control \jHHj\LLr.  
} +xL*`fn  
1Uy'TEk  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) IGKtugU%  
{ D~^P}_e.  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,JU3 w  
 { Q"(*SA+-|  
  CAboutDlg dlgAbout; 5w^6bw){  
  dlgAbout.DoModal(); i L48  
 } / %9DO  
 else s%Y8;D,~+  
 { \H&8.<HJ  
  CDialog::OnSysCommand(nID, lParam); dm(Xy'*iQ  
 } VnU/_# n  
} Cu\6VnW_6  
;1[a*z<l&s  
void CCaptureDlg::OnPaint() $yoIz.?V  
{ &%=]lP]  
 if (IsIconic()) *mVQN1  
 { :4\=xGiY  
  CPaintDC dc(this); // device context for painting exP:lO_0n  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 4S 7#B  
  // Center icon in client rectangle S A\_U::T  
  int cxIcon = GetSystemMetrics(SM_CXICON); azCod1aL{  
  int cyIcon = GetSystemMetrics(SM_CYICON); 4DTT/ER'qA  
  CRect rect; C{<dzooz  
  GetClientRect(&rect); +9fQ YJBA  
  int x = (rect.Width() - cxIcon + 1) / 2; f_m~_`m  
  int y = (rect.Height() - cyIcon + 1) / 2; Uv|?@zy#  
  // Draw the icon rm5@dM@  
  dc.DrawIcon(x, y, m_hIcon); 3ss0/\3P  
 } W{l{O1,  
 else 4^IqHx;bj  
 { Cx[Cst `  
  CDialog::OnPaint(); H'_v  
 } nQm (UN  
} %s;=H)8  
wV{jJyRl  
HCURSOR CCaptureDlg::OnQueryDragIcon() ;i>(r;ZM  
{ :G8:b.  
 return (HCURSOR) m_hIcon; ]IM/R@  
} E=&":I6O  
04E S>'@  
void CCaptureDlg::OnCancel() ,bRYqU?#0  
{ VLP'3 qX  
 if(bTray) Sdr,q9+__  
  DeleteIcon(); ny'wS  
  CDialog::OnCancel(); VEG p!~D  
} W2T-TI,>PC  
pl.x_E,HP  
void CCaptureDlg::OnAbout() PFSh_9. q  
{ 8iwH^+h~  
 CAboutDlg dlg; nYE' 'g+x  
 dlg.DoModal(); o ?`LZd:{  
} (/^dyG|X'  
m2j]wUh"  
void CCaptureDlg::OnBrowse() &0k`=?v$  
{ d cG)ql4d  
 CString str; 87p tab@  
 BROWSEINFO bi; )TtYm3,  
 char name[MAX_PATH];   B'QcD  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); PZYVLUw `  
 bi.hwndOwner=GetSafeHwnd(); ? \p,s-CR:  
 bi.pszDisplayName=name; 6BY(Y(z  
 bi.lpszTitle="Select folder"; 9.^2CM6l  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; m> YjV>5  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); k8S`44vj  
 if(idl==NULL) Dwa.ZY}-  
  return; QZ2a1f'G  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 3T)_(SM"  
 str.ReleaseBuffer(); 5STk"  
 m_Path=str; {9;x\($&a  
 if(str.GetAt(str.GetLength()-1)!='\\') :\cid]y3  
  m_Path+="\\"; qbq.r&F&  
 UpdateData(FALSE); >E\U$}WCG  
} bqcwZ6r<  
Fu\!'\6  
void CCaptureDlg::SaveBmp() OeYZLC(  
{ Rz:1(^oA  
 CDC dc; d]I3zS IC  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); i~i ?M)  
 CBitmap bm; >mUSRf4  
 int Width=GetSystemMetrics(SM_CXSCREEN); lDVw2J'p  
 int Height=GetSystemMetrics(SM_CYSCREEN); &j!q9F  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Gg# 1k TK  
 CDC tdc; J_}Rsp ED  
 tdc.CreateCompatibleDC(&dc); iVZ X  
 CBitmap*pOld=tdc.SelectObject(&bm); o! Y61S(  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); xWxgv;Ah  
 tdc.SelectObject(pOld); SG{&2G  
 BITMAP btm; <gLq?~e|A  
 bm.GetBitmap(&btm); V: P   
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ]r@CmwC  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); G @8wv J  
 BITMAPINFOHEADER bih; X 3(CY`HH[  
 bih.biBitCount=btm.bmBitsPixel; )=Ens=>Z  
 bih.biClrImportant=0; C)(/NGf  
 bih.biClrUsed=0; !9]q+XefJ  
 bih.biCompression=0; c-`izn]  
 bih.biHeight=btm.bmHeight; |TQa=  
 bih.biPlanes=1; Rwe!xY^d8  
 bih.biSize=sizeof(BITMAPINFOHEADER); w@i;<LY.  
 bih.biSizeImage=size; W;^6=(&xn  
 bih.biWidth=btm.bmWidth; K [R.B!;N  
 bih.biXPelsPerMeter=0; .gs:.X)TG9  
 bih.biYPelsPerMeter=0; R&@NFin  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 8!|LJI  
 static int filecount=0; LLU]KZhtY|  
 CString name; z *~rd2  
 name.Format("pict%04d.bmp",filecount++);  +OeoA{-W  
 name=m_Path+name; C%q]o  
 BITMAPFILEHEADER bfh; 7$A=|/'nSA  
 bfh.bfReserved1=bfh.bfReserved2=0; -/LB-t  
 bfh.bfType=((WORD)('M'<< 8)|'B'); yo]8QO]97  
 bfh.bfSize=54+size; (P|k$S?m  
 bfh.bfOffBits=54; FKU)# Eo  
 CFile bf; j*L-sU  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 39oI &D>8  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); `(&GLv[i^2  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); CJf4b:SY@  
  bf.WriteHuge(lpData,size); jVInTR0f[  
  bf.Close(); ofy)}/i  
  nCount++; &]jCoBj+_  
 } w|( ix;pK  
 GlobalFreePtr(lpData); .,&6 x.  
 if(nCount==1) 8ps1Q2|  
  m_Number.Format("%d picture captured.",nCount); >d<tcaB  
 else <hB~|a<#  
  m_Number.Format("%d pictures captured.",nCount); G`R_kg9$  
  UpdateData(FALSE); l *]nvd_  
} 3}x6IM 2  
$&KiN82,  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) M <c cfU!  
{ >gZ"^iW  
 if(pMsg -> message == WM_KEYDOWN) qLk7C0  
 { F ,h}HlU  
  if(pMsg -> wParam == VK_ESCAPE) 4mwLlYZ  
   return TRUE; }cd-BW  
  if(pMsg -> wParam == VK_RETURN) ROj9#:  
   return TRUE; 6bd{3@   
 } I!Uj~jV  
 return CDialog::PreTranslateMessage(pMsg); .v[!_bk8C  
} (Z#j^}G_l  
{9|S,<9  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Q'c[yu  
{ TykY>cl   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ KYC<*1k  
  SaveBmp(); 9ve)+Lk  
  return FALSE; R/ 3#(5  
} `V=F>s$W  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Oi$$vjs2  
 CMenu pop; C`b)}dY  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ^9`~-w  
 CMenu*pMenu=pop.GetSubMenu(0); }-%:!*bLj  
 pMenu->SetDefaultItem(ID_EXITICON); i?IV"*Ob1N  
 CPoint pt; q|S,^0cU  
 GetCursorPos(&pt); f1X]zk(=W  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); U~_G *0  
 if(id==ID_EXITICON) ?Suv.!wfLl  
  DeleteIcon(); %40+si3c  
 else if(id==ID_EXIT) (&xIB F_6  
  OnCancel(); tN-B`d 1  
 return FALSE; 0s%]%2O N  
} &U{"dJr  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 'aJm4W&j  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) KJCi4O&  
 AddIcon(); ?jH u,  
 return res; v.{I^=  
} <c]?  
>IEc4  
void CCaptureDlg::AddIcon() !y7w~UVs  
{ EBx!q8zz  
 NOTIFYICONDATA data; e*hCf5=-  
 data.cbSize=sizeof(NOTIFYICONDATA); Xf*}V+&WN  
 CString tip; *@[N~:z/  
 tip.LoadString(IDS_ICONTIP); p0@l581  
 data.hIcon=GetIcon(0); e<-^  
 data.hWnd=GetSafeHwnd(); R~d{Yv  
 strcpy(data.szTip,tip); S@6 :H"  
 data.uCallbackMessage=IDM_SHELL; +YnQOh%v0s  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; J%lEyU  
 data.uID=98; C:{&cIFrPe  
 Shell_NotifyIcon(NIM_ADD,&data); eZ;DNZK av  
 ShowWindow(SW_HIDE); HVaKy+RU  
 bTray=TRUE; 6d%)MEM  
} W kSv@Y,  
K?X 6@u|h  
void CCaptureDlg::DeleteIcon() R\:t 73  
{ t2#zQ[~X!  
 NOTIFYICONDATA data; A =l1_8,`h  
 data.cbSize=sizeof(NOTIFYICONDATA); SS"Z>talw  
 data.hWnd=GetSafeHwnd(); h f9yK6  
 data.uID=98; N3o kN8d  
 Shell_NotifyIcon(NIM_DELETE,&data); {14sI*b16  
 ShowWindow(SW_SHOW); CV7%ud]E  
 SetForegroundWindow(); A\T9>z^k  
 ShowWindow(SW_SHOWNORMAL); u\P)x~-TM  
 bTray=FALSE; y];@ M<<?e  
} @j+X>TD  
'Z`fZ5q  
void CCaptureDlg::OnChange() :?z E@Ct  
{ p5 )+R/  
 RegisterHotkey(); )ioIn`g^-  
} fhbILg  
D0@d}N  
BOOL CCaptureDlg::RegisterHotkey() ]R6Z(^XT,E  
{ vH/ Y]Am  
 UpdateData(); 9<6Hs3|.!  
 UCHAR mask=0; A:YWXcg  
 UCHAR key=0; VIg=| Oe),  
 if(m_bControl) Mp)|5<%  
  mask|=4; uW^W/S%'  
 if(m_bAlt) | sZu1K  
  mask|=2; g0"KC X  
 if(m_bShift) -KU@0G  
  mask|=1; Ps9YP B-  
  key=Key_Table[m_Key.GetCurSel()]; wm s@1~I  
 if(bRegistered){ rK r2 K'  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); IXt cHAgX  
  bRegistered=FALSE; UCS`09KNJ  
 } =%R|@lz_x  
 cMask=mask; Ll'!aar,  
 cKey=key; \'Ewn8Qv8  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); iWMgU:T  
 return bRegistered; dX ;G [\  
} Jej-b<HmQ  
31n|ScXv  
  四、小结 &{(8EvuDd  
$,#,yl ol  
  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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