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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: pS)X\Xyw  
  z^GGJu%vjr  
  一、实现方法 Dlsa(  
e$+? v2.  
  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: n\)f.}YD8d  
1bAp{u&  
#pragma data_seg("shareddata") *oJ>4S  
HHOOK hHook =NULL; //钩子句柄 5lA 8e  
UINT nHookCount =0; //挂接的程序数目 ^@w1Z{:  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 _ ~$0cj<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 =ir;m  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey XV9'[V  
static int KeyCount =0; }sNZQ89V*v  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 eDZ3SIZ  
#pragma data_seg() RKZk/ly  
gR6T]v  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 yaGVY*M0  
.BTT*vL-  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: F"0jr7  
DppvUiQB!a  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR E0x$;CG!  
cKey,UCHAR cMask) ]CJ>iS!V  
{ (%IstR|u:  
 BOOL bAdded=FALSE; H.S|njn:r  
 for(int index=0;index<MAX_KEY;index++){ ]vyF&`phb  
  if(hCallWnd[index]==0){ "@|V.d@  
   hCallWnd[index]=hWnd; k <Sa<  
   HotKey[index]=cKey; :[?o7%"  
   HotKeyMask[index]=cMask; 'GO..m"G  
   bAdded=TRUE; ,O`*AzjS5Q  
   KeyCount++; QO^X7A"?X  
   break; rca"q[,  
  } !Y i<h/:  
 } Iur} ZAz  
 return bAdded; v%e"4:K}?  
} 8@#Y <{  
//删除热键 8[p6C Jl)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !8M'ms>s=  
{ 'WgwLE_  
 BOOL bRemoved=FALSE; ,>%r|YSJ)  
 for(int index=0;index<MAX_KEY;index++){ *iN]#)3>  
  if(hCallWnd[index]==hWnd){ t/BiZo|zl  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <iqyDPj  
    hCallWnd[index]=NULL; 13@| {H CB  
    HotKey[index]=0; juZ3""  
    HotKeyMask[index]=0; _NN{Wk/3w  
    bRemoved=TRUE; P@![P Ij  
    KeyCount--; ]h8V{%H  
    break; W/QOG&g  
   } QI{Y@xQ  
  } qUg4-Z4  
 } J4^cd  
 return bRemoved; !@ '2  
} [uV/ Ra*g  
JKbB,  
*zht(~%  
  DLL中的钩子函数如下: %NoZf^ ?  
cO+`8`kv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 74OM tLL$  
{ e;3 (,  
 BOOL bProcessed=FALSE; ^>28>!"1  
 if(HC_ACTION==nCode) hfc!M2/w  
 { @Ec9Do>  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 P &._ -[  
   switch(wParam) wd0ACF  
   {  /;ITnG  
    case VK_MENU: "Y0[rSz,UW  
     MaskBits&=~ALTBIT; '.<"jZ  
     break; m$: a|'mS  
    case VK_CONTROL: ~q>ilnL"h  
     MaskBits&=~CTRLBIT; 73`UTXvWU  
     break; n-.k&B{a  
    case VK_SHIFT: d)sl)qt}0  
     MaskBits&=~SHIFTBIT; ;VBfzFH  
     break; ^ } L$[P  
    default: //judge the key and send message bGa":|}F  
     break; E6)mBAE  
   } 9R3=h5Y  
   for(int index=0;index<MAX_KEY;index++){ u^p[zepW\  
    if(hCallWnd[index]==NULL) S"z4jpqn3  
     continue; RO8Ynm2 <  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U.x.gZRo[  
    { V(0[QA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); s3^SjZb  
     bProcessed=TRUE; )Ggx  
    } gJ7pu N  
   } L+CSF ]  
  } )HE yTHLtJ  
  else if((lParam&0xc000ffff)==1){ //有键按下 Pl6=._  
   switch(wParam) ]x\wP7x  
   { 2>s;xZ@/'R  
    case VK_MENU: ?[">%^  
     MaskBits|=ALTBIT; 4 XQ?By  
     break; vX%gcs/@  
    case VK_CONTROL: ZQ/5]]}3y  
     MaskBits|=CTRLBIT; $!@f{9+  
     break; 7 #N @B  
    case VK_SHIFT: c6|&?}F  
     MaskBits|=SHIFTBIT; O}V2> W$  
     break; \O~P !`  
    default: //judge the key and send message p,fin?nW c  
     break; =;T[2:JUu  
   } p04w 83 jX  
   for(int index=0;index<MAX_KEY;index++){ V5 w^Le_^  
    if(hCallWnd[index]==NULL) R4;6Oi)  
     continue; lHXH03  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zYsGI<4  
    { ~K`bl W47  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  ovO^uWz`  
     bProcessed=TRUE; V5MbWXgR  
    } 'r CR8>k  
   } E~Nr4vq  
  } Y8T.RS0  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 6qf`P!7d]M  
   for(int index=0;index<MAX_KEY;index++){ ER+[gT1CQ  
    if(hCallWnd[index]==NULL) uy~j$lrn  
     continue; v\C+G[MV 7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Mt`.|N;y!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); b"b!&u  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 <s >SnOD  
   } ~Ua0pS?  
  } ?9"glzxr  
 } 7Jk.U=vY  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {`> x"Y5  
} _6( =0::x  
=JkSq J)?  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: T /uu='3  
QWEK;kUa@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :08UeEy  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); V96BtV sB  
W0k_"uI  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 9q?gmAn.  
}$ der  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) e{=$4F  
{  o~B=[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) dWA7U6c<  
 { AXFVsZH"zi  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 m" Gr pE3  
  SaveBmp(); :&MiO3#+  
  return FALSE; E J1:N*BA  
 } >e%Po,Fg$  
 …… //其它处理及默认处理 #]2u!a ma  
} .:}\Z27-c  
!=pemLvH  
y5I7pbe  
  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。 "2-TtQV!  
p-Ju&4fS  
  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。 9w1)Mf}  
RA}PM?D/  
  二、编程步骤 9]iDNa/D  
Qi M>59[  
  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"; 81&!!qhfS  
i2DR}%U  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; O?_'6T  
qyto`n7  
  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; FB""^IC?W  
^]HwStn&=  
  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; u|E,Wy1  
d hy=x  
  5、 添加代码,编译运行程序。 iBCM?RiG  
O7W}Z1G  
三、程序代码 RN0Rk 8AC  
Oqyh{q%]  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL +e\u4k{3V  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ocvBKsfhE`  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ D c^d$gh  
#if _MSC_VER > 1000 h!.(7qdd  
#pragma once [0 $Y@ek[  
#endif // _MSC_VER > 1000 `?:'_K i  
#ifndef __AFXWIN_H__ m(Oup=\%b}  
#error include 'stdafx.h' before including this file for PCH #AHIlUH"m  
#endif +_<# 8v  
#include "resource.h" // main symbols :}lE@Y,R   
class CHookApp : public CWinApp q:( K^  
{ lWR  
 public: @0G} Q  
  CHookApp(); O3Uu{'=0  
  // Overrides 1{*x+GC^/  
  // ClassWizard generated virtual function overrides _Uq'eZol  
  //{{AFX_VIRTUAL(CHookApp) u[% #/  
 public: j2z$kw%  
  virtual BOOL InitInstance(); |R4](  
  virtual int ExitInstance(); l!1bmg#]$  
  //}}AFX_VIRTUAL ,xiRP$hGhh  
  //{{AFX_MSG(CHookApp) ^0 t`EZ$  
  // NOTE - the ClassWizard will add and remove member functions here. r=vE0;7  
  // DO NOT EDIT what you see in these blocks of generated code ! -Bc.<pFqp  
  //}}AFX_MSG [4gv_g  
  DECLARE_MESSAGE_MAP() *m;L.r`5[  
}; >[#4Pb7_Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Q{%ow:;s*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); wz ,woF|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); GRNH!:e  
BOOL InitHotkey(); *]rV,\z:  
BOOL UnInit(); Y=5hm  
#endif R75sK(oS  
*Hs5MXNu  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. {uw]s< 6  
#include "stdafx.h" hAY_dM  
#include "hook.h" KS%,N _F<  
#include <windowsx.h> v K$W)(Z  
#ifdef _DEBUG dCinbAQ  
#define new DEBUG_NEW cD 1p5U  
#undef THIS_FILE $HaM, Oh;i  
static char THIS_FILE[] = __FILE__;  z\ \MLyS  
#endif 4)`{ L$  
#define MAX_KEY 100 Aam2Y,B  
#define CTRLBIT 0x04 I?1^\s#L  
#define ALTBIT 0x02 % $J^dF_0  
#define SHIFTBIT 0x01 \d6A<(!=v  
#pragma data_seg("shareddata") {BF$N#7  
HHOOK hHook =NULL; Dd*C?6  
UINT nHookCount =0; D=3NI  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey R_-.:n%.z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT %rf<YZ.\  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ^*ZO@GNL  
static int KeyCount =0; 0_ ;-QAd  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift |{$Vk%cUE  
#pragma data_seg() H.YntFtD'  
HINSTANCE hins; #e=[W))  
void VerifyWindow(); $+Xohtt  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 9Gy1T3y5"  
//{{AFX_MSG_MAP(CHookApp) Alrk3I3{  
// NOTE - the ClassWizard will add and remove mapping macros here. zfS`@{;F`|  
// DO NOT EDIT what you see in these blocks of generated code! *@D.=i>  
//}}AFX_MSG_MAP RxAZ<8T_  
END_MESSAGE_MAP() |d{4_o90  
FvRog<3X  
CHookApp::CHookApp() w*aKb  
{ N^O.P  
 // TODO: add construction code here, NL1Ajms`  
 // Place all significant initialization in InitInstance &n['#7 <(!  
} WXJ%bH  
se_1 wCYz  
CHookApp theApp; 7r:!HmRl  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Zb@PwH4  
{ /: B!hvpw  
 BOOL bProcessed=FALSE; >2%!=q3)  
 if(HC_ACTION==nCode) SlmgFk!r!  
 { Z5v\[i@H!  
  if((lParam&0xc0000000)==0xc0000000){// Key up 1B2>8 N  
   switch(wParam) #HqXC\~n  
   { JVN0];IL}  
    case VK_MENU: xgfK0-T|[  
     MaskBits&=~ALTBIT; 6L8wsz CW  
     break; 0DGXMO$;  
    case VK_CONTROL: M-eX>}CDm  
     MaskBits&=~CTRLBIT; -2f_e3jF  
     break; `Os@/S  
    case VK_SHIFT: )!3sB{ H  
     MaskBits&=~SHIFTBIT; V4_ZBeWA  
     break; E-CZk_K9  
    default: //judge the key and send message <"6 }C)G  
     break; caS5>wk`R  
   } oPl^tzO  
   for(int index=0;index<MAX_KEY;index++){ xse8fGs  
    if(hCallWnd[index]==NULL) 8^kw  
     continue; wD4Kil=v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kid@*.I  
    { yj-BLR5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _pL:dKfy7  
     bProcessed=TRUE; t}+P|$[  
    } wgY: W:y'N  
   } ttgb"Wb%S  
  } ca5Ir<mL  
  else if((lParam&0xc000ffff)==1){ //Key down %R."  
   switch(wParam) i ,ga2{GnM  
   { ~~z} yCl  
    case VK_MENU: R e-4y5f  
     MaskBits|=ALTBIT;  "H#2  
     break; 'V/+v#V+>  
    case VK_CONTROL: xO{yr[x"L  
     MaskBits|=CTRLBIT; 5*C#~gd& F  
     break; (*F/^4p!$  
    case VK_SHIFT: oUoDj'JN{  
     MaskBits|=SHIFTBIT; yHe%e1  
     break; HZKqGkE  
    default: //judge the key and send message :A"GO c,  
     break; 4;=+qb  
   } 741Sd8  
   for(int index=0;index<MAX_KEY;index++) *6<<6f`(  
   { ,Tjc\;~%  
    if(hCallWnd[index]==NULL) WTbq)D(&[_  
     continue; E&9BeU a#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) g{RVxGE7  
    { HW"@~-\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +K{J* n  
     bProcessed=TRUE; "&W80,O3  
    } z&Cz!HrS  
   } @p"m{  
  } ].w~FUa  
  if(!bProcessed){ },+ &y^  
   for(int index=0;index<MAX_KEY;index++){ bL-+  
    if(hCallWnd[index]==NULL) dD ?ZF6  
     continue; b*(74>XY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) E+)3n[G  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); n 'gU  
   } ir !/{IQx  
  } 4d-f 6iiFV  
 } ~lib~Y'-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); NCL!|  
} JS$ojL^  
 >cw%ckE  
BOOL InitHotkey() gaV>WF  
{ Qh3BI?GZ'3  
 if(hHook!=NULL){ }LeizbU  
  nHookCount++; u0p[ltJ,  
  return TRUE; Ce_k&[AJF  
 } qjDt6B^RO  
 else wwaw|$  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); h9RL(Kq{  
  if(hHook!=NULL) :J6 xYy$  
   nHookCount++; i24t$7q  
  return (hHook!=NULL); eCFMWFhC  
} 3127 4O  
BOOL UnInit() >\[/e{Q"  
{ "lLwgh;  
 if(nHookCount>1){ H< 51dJn~  
  nHookCount--; ^pwT8Bp  
  return TRUE; gv\WI4"n  
 } ur\<NApT;  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Vq$8!#~w  
 if(unhooked==TRUE){ mSeCXCrZlI  
  nHookCount=0; :<gC7UW  
  hHook=NULL; YxowArV}uz  
 } s_o{w"3X  
 return unhooked; '-X[T}  
} Gn&=<q :H  
!:baG]Y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *{DpNV8"  
{ _TntZv.?  
 BOOL bAdded=FALSE; #;D@`.#\  
 for(int index=0;index<MAX_KEY;index++){ z>]P_E~`}  
  if(hCallWnd[index]==0){ nEHmiG  
   hCallWnd[index]=hWnd; ;-kC&GZf  
   HotKey[index]=cKey; R`KlG/Tk  
   HotKeyMask[index]=cMask; ` {/"?s|  
   bAdded=TRUE; qBF6LhR  
   KeyCount++; Y#[xX2z9  
   break; D,\hRQ  
  } cXw8#M!  
 } *(E]]8o  
 return bAdded; )sN}ClgJ  
} 0uL*-/|  
_$+BYK@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  gx9=L&=d  
{ g286 P_a`*  
 BOOL bRemoved=FALSE; Nnx dO0X  
 for(int index=0;index<MAX_KEY;index++){ { k>T*/  
  if(hCallWnd[index]==hWnd){ jZr"d*Y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ UMUG~P&@  
    hCallWnd[index]=NULL; TrPw*4h 9s  
    HotKey[index]=0; WeZ?L|&%w0  
    HotKeyMask[index]=0; #(7^V y&  
    bRemoved=TRUE; 'pj*6t1~  
    KeyCount--; >t#5eT`_ w  
    break; dk/f_m  
   } ;oCSKY4  
  } |_njN  
 } S ^]mF>xX8  
 return bRemoved; 1 HY K& ',  
} 9+#BU$*v  
=O%'qUj`q  
void VerifyWindow() =&Z#QD"vl  
{ H S)$|m_  
 for(int i=0;i<MAX_KEY;i++){ +wp!hk&C5  
  if(hCallWnd!=NULL){ 1z3>nou2{  
   if(!IsWindow(hCallWnd)){ 2Q%*` vCuV  
    hCallWnd=NULL; U4=m>Ty  
    HotKey=0;  qC6@  
    HotKeyMask=0; n|fKwWB\  
    KeyCount--; *b7evU *1  
   } pz=/A  
  } K;7ea47m N  
 } @>*r2=#14  
} `y>BbJqy  
~6=aoF5"3?  
BOOL CHookApp::InitInstance() O1Ynl` }  
{ }Gva=N:  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); +#L'g c  
 hins=AfxGetInstanceHandle(); 8.HJoos  
 InitHotkey(); L"RE[" m  
 return CWinApp::InitInstance(); qnFg7X>C,  
} j1 H eX  
` ZBOaN^if  
int CHookApp::ExitInstance() ^EJ]LNk }  
{ vddl9"V)  
 VerifyWindow(); 3"Zc|Ck <?  
 UnInit(); O"}O~lZ[6T  
 return CWinApp::ExitInstance(); +w?-#M#  
} !t[;~`d9  
qND:LP\_v  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file e(I;[G +%,  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) </pt($  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_  Q!5W x  
#if _MSC_VER > 1000 uuQsK. S  
#pragma once _ h/:r1  
#endif // _MSC_VER > 1000 xb2j |KY7  
*B)10R  
class CCaptureDlg : public CDialog NIAji3  
{ >9y!M'V  
 // Construction %?3$~d\n  
 public: jx'hxC'3  
  BOOL bTray; 1{Ik.O)  
  BOOL bRegistered; l{QlJ>%~{;  
  BOOL RegisterHotkey(); BCO (,k  
  UCHAR cKey; dVMLn4[,MA  
  UCHAR cMask; >>c%I c  
  void DeleteIcon(); (coaGQ@d  
  void AddIcon(); !yvw5As%  
  UINT nCount; W/VE B3P>Z  
  void SaveBmp(); `#:(F z  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor nub!*)q  
  // Dialog Data JQ|*XU  
  //{{AFX_DATA(CCaptureDlg) wlQ @3RN>  
  enum { IDD = IDD_CAPTURE_DIALOG }; p+228K ;H  
  CComboBox m_Key; .l,]yWwfK  
  BOOL m_bControl; =QIu3%&  
  BOOL m_bAlt; *x_e] /}  
  BOOL m_bShift; )X3 |[4R  
  CString m_Path; V@+X4`T  
  CString m_Number; #\ECQF  
  //}}AFX_DATA 8_Z"@  
  // ClassWizard generated virtual function overrides 2UopGxrPKw  
  //{{AFX_VIRTUAL(CCaptureDlg) 0+K<;5"63d  
 public: vR (nd  
  virtual BOOL PreTranslateMessage(MSG* pMsg); j )wrF@W  
 protected: 7[0<,O6Q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?w&?P}e +  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); dkW7k^g  
  //}}AFX_VIRTUAL {N << JX  
  // Implementation ^9]g5.z:  
 protected: H6Ytp^~>  
  HICON m_hIcon; _0y]U];ce  
  // Generated message map functions \~r_S  
  //{{AFX_MSG(CCaptureDlg) VR'zm\< D  
  virtual BOOL OnInitDialog(); e0]#vqdO  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); s )Xz}QPK.  
  afx_msg void OnPaint(); ']d(m?  
  afx_msg HCURSOR OnQueryDragIcon(); vsPIvW!V  
  virtual void OnCancel(); 2*V]jO  
  afx_msg void OnAbout(); !?sB=qo  
  afx_msg void OnBrowse(); >`|Wg@_  
  afx_msg void OnChange(); <?:h(IZe[  
 //}}AFX_MSG  hOYX  
 DECLARE_MESSAGE_MAP() <nK@+4EH"o  
}; ~.#57g F"  
#endif (w`_{%T  
0>"y)T3   
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 11Uu5e!.  
#include "stdafx.h" pU<GI@gU  
#include "Capture.h" T)tTzgLD}  
#include "CaptureDlg.h" t~$8sG\  
#include <windowsx.h> AF, ;3G  
#pragma comment(lib,"hook.lib") FxT]*mo  
#ifdef _DEBUG *\_>=sS x;  
#define new DEBUG_NEW $h}w: AV:  
#undef THIS_FILE ;Ah eeq746  
static char THIS_FILE[] = __FILE__; \mZB*k)+  
#endif lk` |u$KPz  
#define IDM_SHELL WM_USER+1 )`S5>[6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); L8oqlq( 9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); fl4 0jo]  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 8@){\.M  
class CAboutDlg : public CDialog a p(PI?]X  
{ Bat@  
 public: >;#rK@*&  
  CAboutDlg(); Y5P9z{X=  
  // Dialog Data ERIF#EY  
  //{{AFX_DATA(CAboutDlg) WqS$C;]%  
  enum { IDD = IDD_ABOUTBOX }; rCb$^(w{7  
  //}}AFX_DATA (!?%"e  
  // ClassWizard generated virtual function overrides "Bz#5kqnl  
  //{{AFX_VIRTUAL(CAboutDlg) i~3\dp  
 protected: brK7|&R<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $GOF'  
  //}}AFX_VIRTUAL N8,g~?r^  
  // Implementation "Z~@"JLb%  
 protected: t3*.Bm:^  
  //{{AFX_MSG(CAboutDlg) }2^qM^,0  
  //}}AFX_MSG QIdml*Np?H  
  DECLARE_MESSAGE_MAP() %$bhg&}  
}; NBAOVYK  
,zdK%V}  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @:@5BCs<  
{ CYsLyk  
 //{{AFX_DATA_INIT(CAboutDlg) %s;5  
 //}}AFX_DATA_INIT EpTc{  
} o5YL_=7m  
||fCY+x*8  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ?T,a(m<i {  
{ ~mZ[@ Z  
 CDialog::DoDataExchange(pDX); -a l  
 //{{AFX_DATA_MAP(CAboutDlg) 69t6lB#;!  
 //}}AFX_DATA_MAP \^!<Y\\  
} -FrK'!\  
uZ+"-Ig  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) &i6JBZ#~,  
 //{{AFX_MSG_MAP(CAboutDlg) A<(Fn_ &W  
 // No message handlers /( 9.Fqe(  
 //}}AFX_MSG_MAP "*S_wN%  
END_MESSAGE_MAP() 4^9qs%&  
>wR)p\UEb  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) iG"1~/U  
: CDialog(CCaptureDlg::IDD, pParent) E_P,>f  
{ Pj*]%V  
 //{{AFX_DATA_INIT(CCaptureDlg) |h&okR+_,  
  m_bControl = FALSE; JUJrtK S  
  m_bAlt = FALSE; 32pPeYxB!-  
  m_bShift = FALSE; bxWzm|  
  m_Path = _T("c:\\"); K.Cx 9  
  m_Number = _T("0 picture captured."); 1\AcceJ|(w  
  nCount=0; _`Y%Y6O1/  
  bRegistered=FALSE; =B`=f,,#3  
  bTray=FALSE; P057]cAat<  
 //}}AFX_DATA_INIT ;y)3/46S  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 <-gGm=R_$  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); V0*MY{x#S  
} KI].T+I  
!Q}Bz*Y  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 3ly ]DTbz  
{ >u|4490<0  
 CDialog::DoDataExchange(pDX); Gz--C(  
 //{{AFX_DATA_MAP(CCaptureDlg) HcV,r,>e  
  DDX_Control(pDX, IDC_KEY, m_Key); &o&}5Aba9  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); K_;?Sr=  
  DDX_Check(pDX, IDC_ALT, m_bAlt); k9&W0$I#  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); e:.D^G Fi  
  DDX_Text(pDX, IDC_PATH, m_Path); WopA7J,  
  DDX_Text(pDX, IDC_NUMBER, m_Number); d" a\`#  
 //}}AFX_DATA_MAP 9)n3f^,Oj*  
} QVmJ_WT  
8hMy$  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) o*[[nK*fL  
//{{AFX_MSG_MAP(CCaptureDlg) Wd7qpWItjQ  
 ON_WM_SYSCOMMAND() X@/wsW(kM\  
 ON_WM_PAINT() q9\(<<f|  
 ON_WM_QUERYDRAGICON() n" vO?8Sx  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) DweF8c  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) UnyJD%a  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 1l^ `  
//}}AFX_MSG_MAP SP vKq=,  
END_MESSAGE_MAP() T?1e&H%USV  
?xwZ< A  
BOOL CCaptureDlg::OnInitDialog() 0}e&ONDQ  
{ r jnf30  
 CDialog::OnInitDialog(); 1C/Vwf:@  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); hD,xJ]zv1  
 ASSERT(IDM_ABOUTBOX < 0xF000); "b"|ay  
 CMenu* pSysMenu = GetSystemMenu(FALSE); B9`_~~^U5  
 if (pSysMenu != NULL) Ss1&fZoj  
 { &O5&pet  
  CString strAboutMenu; fAR 6  
  strAboutMenu.LoadString(IDS_ABOUTBOX);   [ L  
  if (!strAboutMenu.IsEmpty()) =A_{U(>  
  { 7p {2&YhB  
   pSysMenu->AppendMenu(MF_SEPARATOR); KPZqPtb;  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ,8DjQz0ZPo  
  } "ER= c3 t  
 } J6nH|s8  
 SetIcon(m_hIcon, TRUE); // Set big icon  ~!e(e2  
 SetIcon(m_hIcon, FALSE); // Set small icon X1Kze  
 m_Key.SetCurSel(0); d1NKVMeWr  
 RegisterHotkey(); $SzuUI  
 CMenu* pMenu=GetSystemMenu(FALSE); kPSi6ci  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); >^v,,R8j  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); }To-c'  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 7!e kINQ  
 return TRUE; // return TRUE unless you set the focus to a control /g!X[rn7Q  
} D6'-c#  
o KY0e&5  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 2W/*1K}  
{ JK'tdvs~  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) [h.i,%Ua"P  
 { Zj)A%WTD,  
  CAboutDlg dlgAbout; Xx^v%[!`+  
  dlgAbout.DoModal(); Wa iM\h?=#  
 } ciN*gwI)  
 else ko~e*31_E  
 { JNI&]3[C>?  
  CDialog::OnSysCommand(nID, lParam); p(yHB([8  
 } G.^^zmsM`  
} T1RICIf 1F  
,!98V Jmr  
void CCaptureDlg::OnPaint() OV-#8RXJ  
{ K48 QkZ_gY  
 if (IsIconic()) h 3p~\%^  
 { 8>:u%+ C1c  
  CPaintDC dc(this); // device context for painting rWp+kV[Ec>  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); :ZXaJ!  
  // Center icon in client rectangle 7[M@;$  
  int cxIcon = GetSystemMetrics(SM_CXICON); z~jk_|?|?  
  int cyIcon = GetSystemMetrics(SM_CYICON); &qm:36Y7Xg  
  CRect rect; Eq5X/Hx  
  GetClientRect(&rect); 1+ V<-I@{  
  int x = (rect.Width() - cxIcon + 1) / 2; Oz=!EG|N  
  int y = (rect.Height() - cyIcon + 1) / 2; }5u;'>$  
  // Draw the icon ?cD_\~  
  dc.DrawIcon(x, y, m_hIcon); K3`48,`?wA  
 } >NA{**$0  
 else bhCAx W  
 { |3gWH4M4**  
  CDialog::OnPaint(); |(5|6r3  
 } ro^T L  
} a*o k*r  
3e|,Z'4}4  
HCURSOR CCaptureDlg::OnQueryDragIcon() QhPpo#^  
{ :Lq=)'d;6  
 return (HCURSOR) m_hIcon; NOtwgZ-  
} oN(F$Nvk  
wOR#sp&  
void CCaptureDlg::OnCancel() Hnbd<?y   
{ (9+N_dLx~P  
 if(bTray) 31mlnDif  
  DeleteIcon(); 4Gsq)i17j  
  CDialog::OnCancel(); inyS4tb  
} -raZ6?Zjc  
1 <wolTf  
void CCaptureDlg::OnAbout() !jN$U%/,%.  
{ R)9FXz$).  
 CAboutDlg dlg; dkOERVRe  
 dlg.DoModal(); #s-li b  
} 4cAx9bqA  
z9^_5la#  
void CCaptureDlg::OnBrowse() TK#-;p_  
{ 4,ewp coC%  
 CString str; oX[I4i%G  
 BROWSEINFO bi; d6"B_,*b  
 char name[MAX_PATH]; \V9);KAOj  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); -257g;  
 bi.hwndOwner=GetSafeHwnd(); 3$kElq[  
 bi.pszDisplayName=name; bt?)ryu  
 bi.lpszTitle="Select folder"; ~;nW+S$o  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 7`K)7  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 9S)A6]  
 if(idl==NULL) :']O4v#^  
  return; E=~Ahkg  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ZmJHLn[ B  
 str.ReleaseBuffer(); SrXuiiK  
 m_Path=str; q^b_'We_9  
 if(str.GetAt(str.GetLength()-1)!='\\') z0 _/JwJn  
  m_Path+="\\"; zKaEh   
 UpdateData(FALSE); ~Nl`Zmn(A|  
} aB4L$M8x  
@#| R{5=+  
void CCaptureDlg::SaveBmp() QK`2^  
{ "4i_}  
 CDC dc; (OHd} YQ  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); n`7n5M*  
 CBitmap bm; & /lmg!6  
 int Width=GetSystemMetrics(SM_CXSCREEN); /M~rmIks  
 int Height=GetSystemMetrics(SM_CYSCREEN); p2o6 6t  
 bm.CreateCompatibleBitmap(&dc,Width,Height); IR*:i{  
 CDC tdc; 3S1`av(tD  
 tdc.CreateCompatibleDC(&dc); +4Lj}8,  
 CBitmap*pOld=tdc.SelectObject(&bm); p:8]jD@}%  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); )1]LoEdm`  
 tdc.SelectObject(pOld); h3kBNBI )  
 BITMAP btm; =|bW >y  
 bm.GetBitmap(&btm); eR5+1b  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; nB86oQ/S  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); & A@ !g  
 BITMAPINFOHEADER bih; %b`B.A  
 bih.biBitCount=btm.bmBitsPixel; 0qD.OF)8  
 bih.biClrImportant=0; ^->vUf7PX  
 bih.biClrUsed=0; !<MW*7P=  
 bih.biCompression=0; =DXvt5G  
 bih.biHeight=btm.bmHeight; c9;oB|8|  
 bih.biPlanes=1; gc{5/U9H*  
 bih.biSize=sizeof(BITMAPINFOHEADER); DX#F]8bWl  
 bih.biSizeImage=size; %q,^A+=  
 bih.biWidth=btm.bmWidth; j~rarR@NB)  
 bih.biXPelsPerMeter=0; e\>g@xE%  
 bih.biYPelsPerMeter=0; WjMP]ND#c  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); f= l*+QY8f  
 static int filecount=0; U*em)/9  
 CString name; Voc&T+A m  
 name.Format("pict%04d.bmp",filecount++); &0S/]E`_M  
 name=m_Path+name; -qRO}EF  
 BITMAPFILEHEADER bfh; ;:pd/\<  
 bfh.bfReserved1=bfh.bfReserved2=0; ;={Z Bx  
 bfh.bfType=((WORD)('M'<< 8)|'B'); EAjo>GLI  
 bfh.bfSize=54+size; BXo9s~5Q  
 bfh.bfOffBits=54; q9"~sCH  
 CFile bf; ;^:$O6J7T~  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ _i{4 4zE  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); VR0#"  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); esQRg~aCGy  
  bf.WriteHuge(lpData,size); gedk  
  bf.Close(); %epK-q9[  
  nCount++; ZI#Xh5  
 } dbLxm!;(  
 GlobalFreePtr(lpData);  !#8=tO  
 if(nCount==1) 4Vi&Y')f  
  m_Number.Format("%d picture captured.",nCount); A'X, zw^}  
 else n;Etn!4M  
  m_Number.Format("%d pictures captured.",nCount); cZXra(AD  
  UpdateData(FALSE); !4G<&hvb  
} H=k*;'  
v;@-bED(Qs  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) & A<Pf.Us  
{ ;F<)BEXC<  
 if(pMsg -> message == WM_KEYDOWN) h8_~ OX  
 { ' ! ls"qo  
  if(pMsg -> wParam == VK_ESCAPE) rfNt  
   return TRUE; k)R>5?_  
  if(pMsg -> wParam == VK_RETURN) k|}S K9  
   return TRUE; "A?_)=zZ  
 } '%"#]  
 return CDialog::PreTranslateMessage(pMsg); <=,KP)   
} >h m<$3  
wc'K=;c  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) lCyp&b#(L  
{ XL7jUi_4:L  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ n`hes_{,g  
  SaveBmp(); (_lc< Bj  
  return FALSE; 'u2Qq"d+  
} Sm%MoFf  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ?k:i3$  
 CMenu pop; QYL ';  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); BOp&s>hI  
 CMenu*pMenu=pop.GetSubMenu(0); LvNk:99:<  
 pMenu->SetDefaultItem(ID_EXITICON); 8Cr?0Z  
 CPoint pt; q}["Nww-  
 GetCursorPos(&pt); jTx,5s-  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); [Pt5c6L:  
 if(id==ID_EXITICON)  Dk fw*Oo  
  DeleteIcon(); TY|]""3 f9  
 else if(id==ID_EXIT) 1xo<V5  
  OnCancel(); wFaWLC|&  
 return FALSE; N7xkkAS{  
} J ZQ$*K  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ^OQ#Nz  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Do|`wpR  
 AddIcon(); xf@D<}~1  
 return res; Pne[>}_l/  
} rLcQG  
^ffh  
void CCaptureDlg::AddIcon() y|X\f!  
{ 9D_4]'KG  
 NOTIFYICONDATA data; #+eV5%S i  
 data.cbSize=sizeof(NOTIFYICONDATA); wWflZ"%  
 CString tip; O"mU#3?  
 tip.LoadString(IDS_ICONTIP); 1q! 6Sny@  
 data.hIcon=GetIcon(0); GJqSNi}  
 data.hWnd=GetSafeHwnd(); ~I>B5^3  
 strcpy(data.szTip,tip); U9xFQ=$ 2  
 data.uCallbackMessage=IDM_SHELL; T8FKa4ikn  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 'vTD7a^  
 data.uID=98; gGU3e(!Uc  
 Shell_NotifyIcon(NIM_ADD,&data); kc8T@5+I0  
 ShowWindow(SW_HIDE); *R>I%?]V3  
 bTray=TRUE; vwzTrWA=  
} !`='K +  
+-#| M|a  
void CCaptureDlg::DeleteIcon() I=^%l7  
{ )[)-.{q  
 NOTIFYICONDATA data; 4f"a/(>*  
 data.cbSize=sizeof(NOTIFYICONDATA); <96ih$5D1  
 data.hWnd=GetSafeHwnd(); l(zkMR$b8  
 data.uID=98; hk&p+NV!  
 Shell_NotifyIcon(NIM_DELETE,&data); 6|LDb"Rvy  
 ShowWindow(SW_SHOW);  N _r*Ig  
 SetForegroundWindow(); ap9eQsC  
 ShowWindow(SW_SHOWNORMAL); ,Ql3RO,  
 bTray=FALSE; i\rI j0+  
} @Cm"lv.hz  
9#6ilF:F  
void CCaptureDlg::OnChange() vVLR9"rHM  
{ tO?*x/XC{  
 RegisterHotkey(); cVn7jxf  
} ~%Yh`c EP  
Z[`J'}?|  
BOOL CCaptureDlg::RegisterHotkey() BoIe<{X(9  
{ 7XWgY%G  
 UpdateData(); qTyU1RU$9^  
 UCHAR mask=0; ^m8\fCA*  
 UCHAR key=0; Ze Shn  
 if(m_bControl) :yk Z7X&  
  mask|=4; i`8!Vm  
 if(m_bAlt) :eQx di'  
  mask|=2; /IV:JVT  
 if(m_bShift) x)vYc36H  
  mask|=1; { Rw~G&vQ  
  key=Key_Table[m_Key.GetCurSel()]; a$t [}D2  
 if(bRegistered){ _I|wp<R  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); S_2I8G^A  
  bRegistered=FALSE; e@^}y4 C  
 } uNhAfZ  
 cMask=mask; -3_kS/  
 cKey=key; iJrscy-  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); OR"ni  
 return bRegistered; [AX).b  
} |klL KX&  
p dnL~sv  
  四、小结 N'm:V  
PLo.q|%  
  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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